1------------------------------------------------------------------------------ 2-- -- 3-- GNAT COMPILER COMPONENTS -- 4-- -- 5-- S E M _ C H 1 2 -- 6-- -- 7-- B o d y -- 8-- -- 9-- Copyright (C) 1992-2015, Free Software Foundation, Inc. -- 10-- -- 11-- GNAT is free software; you can redistribute it and/or modify it under -- 12-- terms of the GNU General Public License as published by the Free Soft- -- 13-- ware Foundation; either version 3, or (at your option) any later ver- -- 14-- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- 15-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- 16-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- 17-- for more details. You should have received a copy of the GNU General -- 18-- Public License distributed with GNAT; see file COPYING3. If not, go to -- 19-- http://www.gnu.org/licenses for a complete copy of the license. -- 20-- -- 21-- GNAT was originally developed by the GNAT team at New York University. -- 22-- Extensive contributions were provided by Ada Core Technologies Inc. -- 23-- -- 24------------------------------------------------------------------------------ 25 26with Aspects; use Aspects; 27with Atree; use Atree; 28with Einfo; use Einfo; 29with Elists; use Elists; 30with Errout; use Errout; 31with Expander; use Expander; 32with Exp_Disp; use Exp_Disp; 33with Fname; use Fname; 34with Fname.UF; use Fname.UF; 35with Freeze; use Freeze; 36with Ghost; use Ghost; 37with Itypes; use Itypes; 38with Lib; use Lib; 39with Lib.Load; use Lib.Load; 40with Lib.Xref; use Lib.Xref; 41with Nlists; use Nlists; 42with Namet; use Namet; 43with Nmake; use Nmake; 44with Opt; use Opt; 45with Rident; use Rident; 46with Restrict; use Restrict; 47with Rtsfind; use Rtsfind; 48with Sem; use Sem; 49with Sem_Aux; use Sem_Aux; 50with Sem_Cat; use Sem_Cat; 51with Sem_Ch3; use Sem_Ch3; 52with Sem_Ch6; use Sem_Ch6; 53with Sem_Ch7; use Sem_Ch7; 54with Sem_Ch8; use Sem_Ch8; 55with Sem_Ch10; use Sem_Ch10; 56with Sem_Ch13; use Sem_Ch13; 57with Sem_Dim; use Sem_Dim; 58with Sem_Disp; use Sem_Disp; 59with Sem_Elab; use Sem_Elab; 60with Sem_Elim; use Sem_Elim; 61with Sem_Eval; use Sem_Eval; 62with Sem_Res; use Sem_Res; 63with Sem_Type; use Sem_Type; 64with Sem_Util; use Sem_Util; 65with Sem_Warn; use Sem_Warn; 66with Stand; use Stand; 67with Sinfo; use Sinfo; 68with Sinfo.CN; use Sinfo.CN; 69with Sinput; use Sinput; 70with Sinput.L; use Sinput.L; 71with Snames; use Snames; 72with Stringt; use Stringt; 73with Uname; use Uname; 74with Table; 75with Tbuild; use Tbuild; 76with Uintp; use Uintp; 77with Urealp; use Urealp; 78with Warnsw; use Warnsw; 79 80with GNAT.HTable; 81 82package body Sem_Ch12 is 83 84 ---------------------------------------------------------- 85 -- Implementation of Generic Analysis and Instantiation -- 86 ---------------------------------------------------------- 87 88 -- GNAT implements generics by macro expansion. No attempt is made to share 89 -- generic instantiations (for now). Analysis of a generic definition does 90 -- not perform any expansion action, but the expander must be called on the 91 -- tree for each instantiation, because the expansion may of course depend 92 -- on the generic actuals. All of this is best achieved as follows: 93 -- 94 -- a) Semantic analysis of a generic unit is performed on a copy of the 95 -- tree for the generic unit. All tree modifications that follow analysis 96 -- do not affect the original tree. Links are kept between the original 97 -- tree and the copy, in order to recognize non-local references within 98 -- the generic, and propagate them to each instance (recall that name 99 -- resolution is done on the generic declaration: generics are not really 100 -- macros). This is summarized in the following diagram: 101 102 -- .-----------. .----------. 103 -- | semantic |<--------------| generic | 104 -- | copy | | unit | 105 -- | |==============>| | 106 -- |___________| global |__________| 107 -- references | | | 108 -- | | | 109 -- .-----|--|. 110 -- | .-----|---. 111 -- | | .----------. 112 -- | | | generic | 113 -- |__| | | 114 -- |__| instance | 115 -- |__________| 116 117 -- b) Each instantiation copies the original tree, and inserts into it a 118 -- series of declarations that describe the mapping between generic formals 119 -- and actuals. For example, a generic In OUT parameter is an object 120 -- renaming of the corresponding actual, etc. Generic IN parameters are 121 -- constant declarations. 122 123 -- c) In order to give the right visibility for these renamings, we use 124 -- a different scheme for package and subprogram instantiations. For 125 -- packages, the list of renamings is inserted into the package 126 -- specification, before the visible declarations of the package. The 127 -- renamings are analyzed before any of the text of the instance, and are 128 -- thus visible at the right place. Furthermore, outside of the instance, 129 -- the generic parameters are visible and denote their corresponding 130 -- actuals. 131 132 -- For subprograms, we create a container package to hold the renamings 133 -- and the subprogram instance itself. Analysis of the package makes the 134 -- renaming declarations visible to the subprogram. After analyzing the 135 -- package, the defining entity for the subprogram is touched-up so that 136 -- it appears declared in the current scope, and not inside the container 137 -- package. 138 139 -- If the instantiation is a compilation unit, the container package is 140 -- given the same name as the subprogram instance. This ensures that 141 -- the elaboration procedure called by the binder, using the compilation 142 -- unit name, calls in fact the elaboration procedure for the package. 143 144 -- Not surprisingly, private types complicate this approach. By saving in 145 -- the original generic object the non-local references, we guarantee that 146 -- the proper entities are referenced at the point of instantiation. 147 -- However, for private types, this by itself does not insure that the 148 -- proper VIEW of the entity is used (the full type may be visible at the 149 -- point of generic definition, but not at instantiation, or vice-versa). 150 -- In order to reference the proper view, we special-case any reference 151 -- to private types in the generic object, by saving both views, one in 152 -- the generic and one in the semantic copy. At time of instantiation, we 153 -- check whether the two views are consistent, and exchange declarations if 154 -- necessary, in order to restore the correct visibility. Similarly, if 155 -- the instance view is private when the generic view was not, we perform 156 -- the exchange. After completing the instantiation, we restore the 157 -- current visibility. The flag Has_Private_View marks identifiers in the 158 -- the generic unit that require checking. 159 160 -- Visibility within nested generic units requires special handling. 161 -- Consider the following scheme: 162 163 -- type Global is ... -- outside of generic unit. 164 -- generic ... 165 -- package Outer is 166 -- ... 167 -- type Semi_Global is ... -- global to inner. 168 169 -- generic ... -- 1 170 -- procedure inner (X1 : Global; X2 : Semi_Global); 171 172 -- procedure in2 is new inner (...); -- 4 173 -- end Outer; 174 175 -- package New_Outer is new Outer (...); -- 2 176 -- procedure New_Inner is new New_Outer.Inner (...); -- 3 177 178 -- The semantic analysis of Outer captures all occurrences of Global. 179 -- The semantic analysis of Inner (at 1) captures both occurrences of 180 -- Global and Semi_Global. 181 182 -- At point 2 (instantiation of Outer), we also produce a generic copy 183 -- of Inner, even though Inner is, at that point, not being instantiated. 184 -- (This is just part of the semantic analysis of New_Outer). 185 186 -- Critically, references to Global within Inner must be preserved, while 187 -- references to Semi_Global should not preserved, because they must now 188 -- resolve to an entity within New_Outer. To distinguish between these, we 189 -- use a global variable, Current_Instantiated_Parent, which is set when 190 -- performing a generic copy during instantiation (at 2). This variable is 191 -- used when performing a generic copy that is not an instantiation, but 192 -- that is nested within one, as the occurrence of 1 within 2. The analysis 193 -- of a nested generic only preserves references that are global to the 194 -- enclosing Current_Instantiated_Parent. We use the Scope_Depth value to 195 -- determine whether a reference is external to the given parent. 196 197 -- The instantiation at point 3 requires no special treatment. The method 198 -- works as well for further nestings of generic units, but of course the 199 -- variable Current_Instantiated_Parent must be stacked because nested 200 -- instantiations can occur, e.g. the occurrence of 4 within 2. 201 202 -- The instantiation of package and subprogram bodies is handled in a 203 -- similar manner, except that it is delayed until after semantic 204 -- analysis is complete. In this fashion complex cross-dependencies 205 -- between several package declarations and bodies containing generics 206 -- can be compiled which otherwise would diagnose spurious circularities. 207 208 -- For example, it is possible to compile two packages A and B that 209 -- have the following structure: 210 211 -- package A is package B is 212 -- generic ... generic ... 213 -- package G_A is package G_B is 214 215 -- with B; with A; 216 -- package body A is package body B is 217 -- package N_B is new G_B (..) package N_A is new G_A (..) 218 219 -- The table Pending_Instantiations in package Inline is used to keep 220 -- track of body instantiations that are delayed in this manner. Inline 221 -- handles the actual calls to do the body instantiations. This activity 222 -- is part of Inline, since the processing occurs at the same point, and 223 -- for essentially the same reason, as the handling of inlined routines. 224 225 ---------------------------------------------- 226 -- Detection of Instantiation Circularities -- 227 ---------------------------------------------- 228 229 -- If we have a chain of instantiations that is circular, this is static 230 -- error which must be detected at compile time. The detection of these 231 -- circularities is carried out at the point that we insert a generic 232 -- instance spec or body. If there is a circularity, then the analysis of 233 -- the offending spec or body will eventually result in trying to load the 234 -- same unit again, and we detect this problem as we analyze the package 235 -- instantiation for the second time. 236 237 -- At least in some cases after we have detected the circularity, we get 238 -- into trouble if we try to keep going. The following flag is set if a 239 -- circularity is detected, and used to abandon compilation after the 240 -- messages have been posted. 241 242 Circularity_Detected : Boolean := False; 243 -- This should really be reset on encountering a new main unit, but in 244 -- practice we are not using multiple main units so it is not critical. 245 246 -------------------------------------------------- 247 -- Formal packages and partial parameterization -- 248 -------------------------------------------------- 249 250 -- When compiling a generic, a formal package is a local instantiation. If 251 -- declared with a box, its generic formals are visible in the enclosing 252 -- generic. If declared with a partial list of actuals, those actuals that 253 -- are defaulted (covered by an Others clause, or given an explicit box 254 -- initialization) are also visible in the enclosing generic, while those 255 -- that have a corresponding actual are not. 256 257 -- In our source model of instantiation, the same visibility must be 258 -- present in the spec and body of an instance: the names of the formals 259 -- that are defaulted must be made visible within the instance, and made 260 -- invisible (hidden) after the instantiation is complete, so that they 261 -- are not accessible outside of the instance. 262 263 -- In a generic, a formal package is treated like a special instantiation. 264 -- Our Ada 95 compiler handled formals with and without box in different 265 -- ways. With partial parameterization, we use a single model for both. 266 -- We create a package declaration that consists of the specification of 267 -- the generic package, and a set of declarations that map the actuals 268 -- into local renamings, just as we do for bona fide instantiations. For 269 -- defaulted parameters and formals with a box, we copy directly the 270 -- declarations of the formal into this local package. The result is a 271 -- a package whose visible declarations may include generic formals. This 272 -- package is only used for type checking and visibility analysis, and 273 -- never reaches the back-end, so it can freely violate the placement 274 -- rules for generic formal declarations. 275 276 -- The list of declarations (renamings and copies of formals) is built 277 -- by Analyze_Associations, just as for regular instantiations. 278 279 -- At the point of instantiation, conformance checking must be applied only 280 -- to those parameters that were specified in the formal. We perform this 281 -- checking by creating another internal instantiation, this one including 282 -- only the renamings and the formals (the rest of the package spec is not 283 -- relevant to conformance checking). We can then traverse two lists: the 284 -- list of actuals in the instance that corresponds to the formal package, 285 -- and the list of actuals produced for this bogus instantiation. We apply 286 -- the conformance rules to those actuals that are not defaulted (i.e. 287 -- which still appear as generic formals. 288 289 -- When we compile an instance body we must make the right parameters 290 -- visible again. The predicate Is_Generic_Formal indicates which of the 291 -- formals should have its Is_Hidden flag reset. 292 293 ----------------------- 294 -- Local subprograms -- 295 ----------------------- 296 297 procedure Abandon_Instantiation (N : Node_Id); 298 pragma No_Return (Abandon_Instantiation); 299 -- Posts an error message "instantiation abandoned" at the indicated node 300 -- and then raises the exception Instantiation_Error to do it. 301 302 procedure Analyze_Formal_Array_Type 303 (T : in out Entity_Id; 304 Def : Node_Id); 305 -- A formal array type is treated like an array type declaration, and 306 -- invokes Array_Type_Declaration (sem_ch3) whose first parameter is 307 -- in-out, because in the case of an anonymous type the entity is 308 -- actually created in the procedure. 309 310 -- The following procedures treat other kinds of formal parameters 311 312 procedure Analyze_Formal_Derived_Interface_Type 313 (N : Node_Id; 314 T : Entity_Id; 315 Def : Node_Id); 316 317 procedure Analyze_Formal_Derived_Type 318 (N : Node_Id; 319 T : Entity_Id; 320 Def : Node_Id); 321 322 procedure Analyze_Formal_Interface_Type 323 (N : Node_Id; 324 T : Entity_Id; 325 Def : Node_Id); 326 327 -- The following subprograms create abbreviated declarations for formal 328 -- scalar types. We introduce an anonymous base of the proper class for 329 -- each of them, and define the formals as constrained first subtypes of 330 -- their bases. The bounds are expressions that are non-static in the 331 -- generic. 332 333 procedure Analyze_Formal_Decimal_Fixed_Point_Type 334 (T : Entity_Id; Def : Node_Id); 335 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id); 336 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id); 337 procedure Analyze_Formal_Signed_Integer_Type (T : Entity_Id; Def : Node_Id); 338 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id); 339 procedure Analyze_Formal_Ordinary_Fixed_Point_Type 340 (T : Entity_Id; Def : Node_Id); 341 342 procedure Analyze_Formal_Private_Type 343 (N : Node_Id; 344 T : Entity_Id; 345 Def : Node_Id); 346 -- Creates a new private type, which does not require completion 347 348 procedure Analyze_Formal_Incomplete_Type (T : Entity_Id; Def : Node_Id); 349 -- Ada 2012: Creates a new incomplete type whose actual does not freeze 350 351 procedure Analyze_Generic_Formal_Part (N : Node_Id); 352 -- Analyze generic formal part 353 354 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id); 355 -- Create a new access type with the given designated type 356 357 function Analyze_Associations 358 (I_Node : Node_Id; 359 Formals : List_Id; 360 F_Copy : List_Id) return List_Id; 361 -- At instantiation time, build the list of associations between formals 362 -- and actuals. Each association becomes a renaming declaration for the 363 -- formal entity. F_Copy is the analyzed list of formals in the generic 364 -- copy. It is used to apply legality checks to the actuals. I_Node is the 365 -- instantiation node itself. 366 367 procedure Analyze_Subprogram_Instantiation 368 (N : Node_Id; 369 K : Entity_Kind); 370 371 procedure Build_Instance_Compilation_Unit_Nodes 372 (N : Node_Id; 373 Act_Body : Node_Id; 374 Act_Decl : Node_Id); 375 -- This procedure is used in the case where the generic instance of a 376 -- subprogram body or package body is a library unit. In this case, the 377 -- original library unit node for the generic instantiation must be 378 -- replaced by the resulting generic body, and a link made to a new 379 -- compilation unit node for the generic declaration. The argument N is 380 -- the original generic instantiation. Act_Body and Act_Decl are the body 381 -- and declaration of the instance (either package body and declaration 382 -- nodes or subprogram body and declaration nodes depending on the case). 383 -- On return, the node N has been rewritten with the actual body. 384 385 procedure Check_Access_Definition (N : Node_Id); 386 -- Subsidiary routine to null exclusion processing. Perform an assertion 387 -- check on Ada version and the presence of an access definition in N. 388 389 procedure Check_Formal_Packages (P_Id : Entity_Id); 390 -- Apply the following to all formal packages in generic associations 391 392 procedure Check_Formal_Package_Instance 393 (Formal_Pack : Entity_Id; 394 Actual_Pack : Entity_Id); 395 -- Verify that the actuals of the actual instance match the actuals of 396 -- the template for a formal package that is not declared with a box. 397 398 procedure Check_Forward_Instantiation (Decl : Node_Id); 399 -- If the generic is a local entity and the corresponding body has not 400 -- been seen yet, flag enclosing packages to indicate that it will be 401 -- elaborated after the generic body. Subprograms declared in the same 402 -- package cannot be inlined by the front-end because front-end inlining 403 -- requires a strict linear order of elaboration. 404 405 function Check_Hidden_Primitives (Assoc_List : List_Id) return Elist_Id; 406 -- Check if some association between formals and actuals requires to make 407 -- visible primitives of a tagged type, and make those primitives visible. 408 -- Return the list of primitives whose visibility is modified (to restore 409 -- their visibility later through Restore_Hidden_Primitives). If no 410 -- candidate is found then return No_Elist. 411 412 procedure Check_Hidden_Child_Unit 413 (N : Node_Id; 414 Gen_Unit : Entity_Id; 415 Act_Decl_Id : Entity_Id); 416 -- If the generic unit is an implicit child instance within a parent 417 -- instance, we need to make an explicit test that it is not hidden by 418 -- a child instance of the same name and parent. 419 420 procedure Check_Generic_Actuals 421 (Instance : Entity_Id; 422 Is_Formal_Box : Boolean); 423 -- Similar to previous one. Check the actuals in the instantiation, 424 -- whose views can change between the point of instantiation and the point 425 -- of instantiation of the body. In addition, mark the generic renamings 426 -- as generic actuals, so that they are not compatible with other actuals. 427 -- Recurse on an actual that is a formal package whose declaration has 428 -- a box. 429 430 function Contains_Instance_Of 431 (Inner : Entity_Id; 432 Outer : Entity_Id; 433 N : Node_Id) return Boolean; 434 -- Inner is instantiated within the generic Outer. Check whether Inner 435 -- directly or indirectly contains an instance of Outer or of one of its 436 -- parents, in the case of a subunit. Each generic unit holds a list of 437 -- the entities instantiated within (at any depth). This procedure 438 -- determines whether the set of such lists contains a cycle, i.e. an 439 -- illegal circular instantiation. 440 441 function Denotes_Formal_Package 442 (Pack : Entity_Id; 443 On_Exit : Boolean := False; 444 Instance : Entity_Id := Empty) return Boolean; 445 -- Returns True if E is a formal package of an enclosing generic, or 446 -- the actual for such a formal in an enclosing instantiation. If such 447 -- a package is used as a formal in an nested generic, or as an actual 448 -- in a nested instantiation, the visibility of ITS formals should not 449 -- be modified. When called from within Restore_Private_Views, the flag 450 -- On_Exit is true, to indicate that the search for a possible enclosing 451 -- instance should ignore the current one. In that case Instance denotes 452 -- the declaration for which this is an actual. This declaration may be 453 -- an instantiation in the source, or the internal instantiation that 454 -- corresponds to the actual for a formal package. 455 456 function Earlier (N1, N2 : Node_Id) return Boolean; 457 -- Yields True if N1 and N2 appear in the same compilation unit, 458 -- ignoring subunits, and if N1 is to the left of N2 in a left-to-right 459 -- traversal of the tree for the unit. Used to determine the placement 460 -- of freeze nodes for instance bodies that may depend on other instances. 461 462 function Find_Actual_Type 463 (Typ : Entity_Id; 464 Gen_Type : Entity_Id) return Entity_Id; 465 -- When validating the actual types of a child instance, check whether 466 -- the formal is a formal type of the parent unit, and retrieve the current 467 -- actual for it. Typ is the entity in the analyzed formal type declaration 468 -- (component or index type of an array type, or designated type of an 469 -- access formal) and Gen_Type is the enclosing analyzed formal array 470 -- or access type. The desired actual may be a formal of a parent, or may 471 -- be declared in a formal package of a parent. In both cases it is a 472 -- generic actual type because it appears within a visible instance. 473 -- Finally, it may be declared in a parent unit without being a formal 474 -- of that unit, in which case it must be retrieved by visibility. 475 -- Ambiguities may still arise if two homonyms are declared in two formal 476 -- packages, and the prefix of the formal type may be needed to resolve 477 -- the ambiguity in the instance ??? 478 479 function In_Same_Declarative_Part 480 (F_Node : Node_Id; 481 Inst : Node_Id) return Boolean; 482 -- True if the instantiation Inst and the given freeze_node F_Node appear 483 -- within the same declarative part, ignoring subunits, but with no inter- 484 -- vening subprograms or concurrent units. Used to find the proper plave 485 -- for the freeze node of an instance, when the generic is declared in a 486 -- previous instance. If predicate is true, the freeze node of the instance 487 -- can be placed after the freeze node of the previous instance, Otherwise 488 -- it has to be placed at the end of the current declarative part. 489 490 function In_Main_Context (E : Entity_Id) return Boolean; 491 -- Check whether an instantiation is in the context of the main unit. 492 -- Used to determine whether its body should be elaborated to allow 493 -- front-end inlining. 494 495 procedure Set_Instance_Env 496 (Gen_Unit : Entity_Id; 497 Act_Unit : Entity_Id); 498 -- Save current instance on saved environment, to be used to determine 499 -- the global status of entities in nested instances. Part of Save_Env. 500 -- called after verifying that the generic unit is legal for the instance, 501 -- The procedure also examines whether the generic unit is a predefined 502 -- unit, in order to set configuration switches accordingly. As a result 503 -- the procedure must be called after analyzing and freezing the actuals. 504 505 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id); 506 -- Associate analyzed generic parameter with corresponding 507 -- instance. Used for semantic checks at instantiation time. 508 509 function Has_Been_Exchanged (E : Entity_Id) return Boolean; 510 -- Traverse the Exchanged_Views list to see if a type was private 511 -- and has already been flipped during this phase of instantiation. 512 513 procedure Hide_Current_Scope; 514 -- When instantiating a generic child unit, the parent context must be 515 -- present, but the instance and all entities that may be generated 516 -- must be inserted in the current scope. We leave the current scope 517 -- on the stack, but make its entities invisible to avoid visibility 518 -- problems. This is reversed at the end of the instantiation. This is 519 -- not done for the instantiation of the bodies, which only require the 520 -- instances of the generic parents to be in scope. 521 522 procedure Install_Body 523 (Act_Body : Node_Id; 524 N : Node_Id; 525 Gen_Body : Node_Id; 526 Gen_Decl : Node_Id); 527 -- If the instantiation happens textually before the body of the generic, 528 -- the instantiation of the body must be analyzed after the generic body, 529 -- and not at the point of instantiation. Such early instantiations can 530 -- happen if the generic and the instance appear in a package declaration 531 -- because the generic body can only appear in the corresponding package 532 -- body. Early instantiations can also appear if generic, instance and 533 -- body are all in the declarative part of a subprogram or entry. Entities 534 -- of packages that are early instantiations are delayed, and their freeze 535 -- node appears after the generic body. 536 537 procedure Insert_Freeze_Node_For_Instance 538 (N : Node_Id; 539 F_Node : Node_Id); 540 -- N denotes a package or a subprogram instantiation and F_Node is the 541 -- associated freeze node. Insert the freeze node before the first source 542 -- body which follows immediately after N. If no such body is found, the 543 -- freeze node is inserted at the end of the declarative region which 544 -- contains N. 545 546 procedure Freeze_Subprogram_Body 547 (Inst_Node : Node_Id; 548 Gen_Body : Node_Id; 549 Pack_Id : Entity_Id); 550 -- The generic body may appear textually after the instance, including 551 -- in the proper body of a stub, or within a different package instance. 552 -- Given that the instance can only be elaborated after the generic, we 553 -- place freeze_nodes for the instance and/or for packages that may enclose 554 -- the instance and the generic, so that the back-end can establish the 555 -- proper order of elaboration. 556 557 procedure Init_Env; 558 -- Establish environment for subsequent instantiation. Separated from 559 -- Save_Env because data-structures for visibility handling must be 560 -- initialized before call to Check_Generic_Child_Unit. 561 562 procedure Install_Formal_Packages (Par : Entity_Id); 563 -- Install the visible part of any formal of the parent that is a formal 564 -- package. Note that for the case of a formal package with a box, this 565 -- includes the formal part of the formal package (12.7(10/2)). 566 567 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False); 568 -- When compiling an instance of a child unit the parent (which is 569 -- itself an instance) is an enclosing scope that must be made 570 -- immediately visible. This procedure is also used to install the non- 571 -- generic parent of a generic child unit when compiling its body, so 572 -- that full views of types in the parent are made visible. 573 574 procedure Remove_Parent (In_Body : Boolean := False); 575 -- Reverse effect after instantiation of child is complete 576 577 procedure Install_Hidden_Primitives 578 (Prims_List : in out Elist_Id; 579 Gen_T : Entity_Id; 580 Act_T : Entity_Id); 581 -- Remove suffix 'P' from hidden primitives of Act_T to match the 582 -- visibility of primitives of Gen_T. The list of primitives to which 583 -- the suffix is removed is added to Prims_List to restore them later. 584 585 procedure Restore_Hidden_Primitives (Prims_List : in out Elist_Id); 586 -- Restore suffix 'P' to primitives of Prims_List and leave Prims_List 587 -- set to No_Elist. 588 589 procedure Inline_Instance_Body 590 (N : Node_Id; 591 Gen_Unit : Entity_Id; 592 Act_Decl : Node_Id); 593 -- If front-end inlining is requested, instantiate the package body, 594 -- and preserve the visibility of its compilation unit, to insure 595 -- that successive instantiations succeed. 596 597 -- The functions Instantiate_XXX perform various legality checks and build 598 -- the declarations for instantiated generic parameters. In all of these 599 -- Formal is the entity in the generic unit, Actual is the entity of 600 -- expression in the generic associations, and Analyzed_Formal is the 601 -- formal in the generic copy, which contains the semantic information to 602 -- be used to validate the actual. 603 604 function Instantiate_Object 605 (Formal : Node_Id; 606 Actual : Node_Id; 607 Analyzed_Formal : Node_Id) return List_Id; 608 609 function Instantiate_Type 610 (Formal : Node_Id; 611 Actual : Node_Id; 612 Analyzed_Formal : Node_Id; 613 Actual_Decls : List_Id) return List_Id; 614 615 function Instantiate_Formal_Subprogram 616 (Formal : Node_Id; 617 Actual : Node_Id; 618 Analyzed_Formal : Node_Id) return Node_Id; 619 620 function Instantiate_Formal_Package 621 (Formal : Node_Id; 622 Actual : Node_Id; 623 Analyzed_Formal : Node_Id) return List_Id; 624 -- If the formal package is declared with a box, special visibility rules 625 -- apply to its formals: they are in the visible part of the package. This 626 -- is true in the declarative region of the formal package, that is to say 627 -- in the enclosing generic or instantiation. For an instantiation, the 628 -- parameters of the formal package are made visible in an explicit step. 629 -- Furthermore, if the actual has a visible USE clause, these formals must 630 -- be made potentially use-visible as well. On exit from the enclosing 631 -- instantiation, the reverse must be done. 632 633 -- For a formal package declared without a box, there are conformance rules 634 -- that apply to the actuals in the generic declaration and the actuals of 635 -- the actual package in the enclosing instantiation. The simplest way to 636 -- apply these rules is to repeat the instantiation of the formal package 637 -- in the context of the enclosing instance, and compare the generic 638 -- associations of this instantiation with those of the actual package. 639 -- This internal instantiation only needs to contain the renamings of the 640 -- formals: the visible and private declarations themselves need not be 641 -- created. 642 643 -- In Ada 2005, the formal package may be only partially parameterized. 644 -- In that case the visibility step must make visible those actuals whose 645 -- corresponding formals were given with a box. A final complication 646 -- involves inherited operations from formal derived types, which must 647 -- be visible if the type is. 648 649 function Is_In_Main_Unit (N : Node_Id) return Boolean; 650 -- Test if given node is in the main unit 651 652 procedure Load_Parent_Of_Generic 653 (N : Node_Id; 654 Spec : Node_Id; 655 Body_Optional : Boolean := False); 656 -- If the generic appears in a separate non-generic library unit, load the 657 -- corresponding body to retrieve the body of the generic. N is the node 658 -- for the generic instantiation, Spec is the generic package declaration. 659 -- 660 -- Body_Optional is a flag that indicates that the body is being loaded to 661 -- ensure that temporaries are generated consistently when there are other 662 -- instances in the current declarative part that precede the one being 663 -- loaded. In that case a missing body is acceptable. 664 665 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id); 666 -- Add the context clause of the unit containing a generic unit to a 667 -- compilation unit that is, or contains, an instantiation. 668 669 function Get_Associated_Node (N : Node_Id) return Node_Id; 670 -- In order to propagate semantic information back from the analyzed copy 671 -- to the original generic, we maintain links between selected nodes in the 672 -- generic and their corresponding copies. At the end of generic analysis, 673 -- the routine Save_Global_References traverses the generic tree, examines 674 -- the semantic information, and preserves the links to those nodes that 675 -- contain global information. At instantiation, the information from the 676 -- associated node is placed on the new copy, so that name resolution is 677 -- not repeated. 678 -- 679 -- Three kinds of source nodes have associated nodes: 680 -- 681 -- a) those that can reference (denote) entities, that is identifiers, 682 -- character literals, expanded_names, operator symbols, operators, 683 -- and attribute reference nodes. These nodes have an Entity field 684 -- and are the set of nodes that are in N_Has_Entity. 685 -- 686 -- b) aggregates (N_Aggregate and N_Extension_Aggregate) 687 -- 688 -- c) selected components (N_Selected_Component) 689 -- 690 -- For the first class, the associated node preserves the entity if it is 691 -- global. If the generic contains nested instantiations, the associated 692 -- node itself has been recopied, and a chain of them must be followed. 693 -- 694 -- For aggregates, the associated node allows retrieval of the type, which 695 -- may otherwise not appear in the generic. The view of this type may be 696 -- different between generic and instantiation, and the full view can be 697 -- installed before the instantiation is analyzed. For aggregates of type 698 -- extensions, the same view exchange may have to be performed for some of 699 -- the ancestor types, if their view is private at the point of 700 -- instantiation. 701 -- 702 -- Nodes that are selected components in the parse tree may be rewritten 703 -- as expanded names after resolution, and must be treated as potential 704 -- entity holders, which is why they also have an Associated_Node. 705 -- 706 -- Nodes that do not come from source, such as freeze nodes, do not appear 707 -- in the generic tree, and need not have an associated node. 708 -- 709 -- The associated node is stored in the Associated_Node field. Note that 710 -- this field overlaps Entity, which is fine, because the whole point is 711 -- that we don't need or want the normal Entity field in this situation. 712 713 procedure Map_Formal_Package_Entities (Form : Entity_Id; Act : Entity_Id); 714 -- Within the generic part, entities in the formal package are 715 -- visible. To validate subsequent type declarations, indicate 716 -- the correspondence between the entities in the analyzed formal, 717 -- and the entities in the actual package. There are three packages 718 -- involved in the instantiation of a formal package: the parent 719 -- generic P1 which appears in the generic declaration, the fake 720 -- instantiation P2 which appears in the analyzed generic, and whose 721 -- visible entities may be used in subsequent formals, and the actual 722 -- P3 in the instance. To validate subsequent formals, me indicate 723 -- that the entities in P2 are mapped into those of P3. The mapping of 724 -- entities has to be done recursively for nested packages. 725 726 procedure Move_Freeze_Nodes 727 (Out_Of : Entity_Id; 728 After : Node_Id; 729 L : List_Id); 730 -- Freeze nodes can be generated in the analysis of a generic unit, but 731 -- will not be seen by the back-end. It is necessary to move those nodes 732 -- to the enclosing scope if they freeze an outer entity. We place them 733 -- at the end of the enclosing generic package, which is semantically 734 -- neutral. 735 736 procedure Preanalyze_Actuals (N : Node_Id); 737 -- Analyze actuals to perform name resolution. Full resolution is done 738 -- later, when the expected types are known, but names have to be captured 739 -- before installing parents of generics, that are not visible for the 740 -- actuals themselves. 741 742 function True_Parent (N : Node_Id) return Node_Id; 743 -- For a subunit, return parent of corresponding stub, else return 744 -- parent of node. 745 746 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id); 747 -- Verify that an attribute that appears as the default for a formal 748 -- subprogram is a function or procedure with the correct profile. 749 750 ------------------------------------------- 751 -- Data Structures for Generic Renamings -- 752 ------------------------------------------- 753 754 -- The map Generic_Renamings associates generic entities with their 755 -- corresponding actuals. Currently used to validate type instances. It 756 -- will eventually be used for all generic parameters to eliminate the 757 -- need for overload resolution in the instance. 758 759 type Assoc_Ptr is new Int; 760 761 Assoc_Null : constant Assoc_Ptr := -1; 762 763 type Assoc is record 764 Gen_Id : Entity_Id; 765 Act_Id : Entity_Id; 766 Next_In_HTable : Assoc_Ptr; 767 end record; 768 769 package Generic_Renamings is new Table.Table 770 (Table_Component_Type => Assoc, 771 Table_Index_Type => Assoc_Ptr, 772 Table_Low_Bound => 0, 773 Table_Initial => 10, 774 Table_Increment => 100, 775 Table_Name => "Generic_Renamings"); 776 777 -- Variable to hold enclosing instantiation. When the environment is 778 -- saved for a subprogram inlining, the corresponding Act_Id is empty. 779 780 Current_Instantiated_Parent : Assoc := (Empty, Empty, Assoc_Null); 781 782 -- Hash table for associations 783 784 HTable_Size : constant := 37; 785 type HTable_Range is range 0 .. HTable_Size - 1; 786 787 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr); 788 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr; 789 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id; 790 function Hash (F : Entity_Id) return HTable_Range; 791 792 package Generic_Renamings_HTable is new GNAT.HTable.Static_HTable ( 793 Header_Num => HTable_Range, 794 Element => Assoc, 795 Elmt_Ptr => Assoc_Ptr, 796 Null_Ptr => Assoc_Null, 797 Set_Next => Set_Next_Assoc, 798 Next => Next_Assoc, 799 Key => Entity_Id, 800 Get_Key => Get_Gen_Id, 801 Hash => Hash, 802 Equal => "="); 803 804 Exchanged_Views : Elist_Id; 805 -- This list holds the private views that have been exchanged during 806 -- instantiation to restore the visibility of the generic declaration. 807 -- (see comments above). After instantiation, the current visibility is 808 -- reestablished by means of a traversal of this list. 809 810 Hidden_Entities : Elist_Id; 811 -- This list holds the entities of the current scope that are removed 812 -- from immediate visibility when instantiating a child unit. Their 813 -- visibility is restored in Remove_Parent. 814 815 -- Because instantiations can be recursive, the following must be saved 816 -- on entry and restored on exit from an instantiation (spec or body). 817 -- This is done by the two procedures Save_Env and Restore_Env. For 818 -- package and subprogram instantiations (but not for the body instances) 819 -- the action of Save_Env is done in two steps: Init_Env is called before 820 -- Check_Generic_Child_Unit, because setting the parent instances requires 821 -- that the visibility data structures be properly initialized. Once the 822 -- generic is unit is validated, Set_Instance_Env completes Save_Env. 823 824 Parent_Unit_Visible : Boolean := False; 825 -- Parent_Unit_Visible is used when the generic is a child unit, and 826 -- indicates whether the ultimate parent of the generic is visible in the 827 -- instantiation environment. It is used to reset the visibility of the 828 -- parent at the end of the instantiation (see Remove_Parent). 829 830 Instance_Parent_Unit : Entity_Id := Empty; 831 -- This records the ultimate parent unit of an instance of a generic 832 -- child unit and is used in conjunction with Parent_Unit_Visible to 833 -- indicate the unit to which the Parent_Unit_Visible flag corresponds. 834 835 type Instance_Env is record 836 Instantiated_Parent : Assoc; 837 Exchanged_Views : Elist_Id; 838 Hidden_Entities : Elist_Id; 839 Current_Sem_Unit : Unit_Number_Type; 840 Parent_Unit_Visible : Boolean := False; 841 Instance_Parent_Unit : Entity_Id := Empty; 842 Switches : Config_Switches_Type; 843 end record; 844 845 package Instance_Envs is new Table.Table ( 846 Table_Component_Type => Instance_Env, 847 Table_Index_Type => Int, 848 Table_Low_Bound => 0, 849 Table_Initial => 32, 850 Table_Increment => 100, 851 Table_Name => "Instance_Envs"); 852 853 procedure Restore_Private_Views 854 (Pack_Id : Entity_Id; 855 Is_Package : Boolean := True); 856 -- Restore the private views of external types, and unmark the generic 857 -- renamings of actuals, so that they become compatible subtypes again. 858 -- For subprograms, Pack_Id is the package constructed to hold the 859 -- renamings. 860 861 procedure Switch_View (T : Entity_Id); 862 -- Switch the partial and full views of a type and its private 863 -- dependents (i.e. its subtypes and derived types). 864 865 ------------------------------------ 866 -- Structures for Error Reporting -- 867 ------------------------------------ 868 869 Instantiation_Node : Node_Id; 870 -- Used by subprograms that validate instantiation of formal parameters 871 -- where there might be no actual on which to place the error message. 872 -- Also used to locate the instantiation node for generic subunits. 873 874 Instantiation_Error : exception; 875 -- When there is a semantic error in the generic parameter matching, 876 -- there is no point in continuing the instantiation, because the 877 -- number of cascaded errors is unpredictable. This exception aborts 878 -- the instantiation process altogether. 879 880 S_Adjustment : Sloc_Adjustment; 881 -- Offset created for each node in an instantiation, in order to keep 882 -- track of the source position of the instantiation in each of its nodes. 883 -- A subsequent semantic error or warning on a construct of the instance 884 -- points to both places: the original generic node, and the point of 885 -- instantiation. See Sinput and Sinput.L for additional details. 886 887 ------------------------------------------------------------ 888 -- Data structure for keeping track when inside a Generic -- 889 ------------------------------------------------------------ 890 891 -- The following table is used to save values of the Inside_A_Generic 892 -- flag (see spec of Sem) when they are saved by Start_Generic. 893 894 package Generic_Flags is new Table.Table ( 895 Table_Component_Type => Boolean, 896 Table_Index_Type => Int, 897 Table_Low_Bound => 0, 898 Table_Initial => 32, 899 Table_Increment => 200, 900 Table_Name => "Generic_Flags"); 901 902 --------------------------- 903 -- Abandon_Instantiation -- 904 --------------------------- 905 906 procedure Abandon_Instantiation (N : Node_Id) is 907 begin 908 Error_Msg_N ("\instantiation abandoned!", N); 909 raise Instantiation_Error; 910 end Abandon_Instantiation; 911 912 -------------------------- 913 -- Analyze_Associations -- 914 -------------------------- 915 916 function Analyze_Associations 917 (I_Node : Node_Id; 918 Formals : List_Id; 919 F_Copy : List_Id) return List_Id 920 is 921 Actuals_To_Freeze : constant Elist_Id := New_Elmt_List; 922 Assoc : constant List_Id := New_List; 923 Default_Actuals : constant List_Id := New_List; 924 Gen_Unit : constant Entity_Id := 925 Defining_Entity (Parent (F_Copy)); 926 927 Actuals : List_Id; 928 Actual : Node_Id; 929 Analyzed_Formal : Node_Id; 930 First_Named : Node_Id := Empty; 931 Formal : Node_Id; 932 Match : Node_Id; 933 Named : Node_Id; 934 Saved_Formal : Node_Id; 935 936 Default_Formals : constant List_Id := New_List; 937 -- If an Others_Choice is present, some of the formals may be defaulted. 938 -- To simplify the treatment of visibility in an instance, we introduce 939 -- individual defaults for each such formal. These defaults are 940 -- appended to the list of associations and replace the Others_Choice. 941 942 Found_Assoc : Node_Id; 943 -- Association for the current formal being match. Empty if there are 944 -- no remaining actuals, or if there is no named association with the 945 -- name of the formal. 946 947 Is_Named_Assoc : Boolean; 948 Num_Matched : Int := 0; 949 Num_Actuals : Int := 0; 950 951 Others_Present : Boolean := False; 952 Others_Choice : Node_Id := Empty; 953 -- In Ada 2005, indicates partial parameterization of a formal 954 -- package. As usual an other association must be last in the list. 955 956 procedure Check_Overloaded_Formal_Subprogram (Formal : Entity_Id); 957 -- Apply RM 12.3 (9): if a formal subprogram is overloaded, the instance 958 -- cannot have a named association for it. AI05-0025 extends this rule 959 -- to formals of formal packages by AI05-0025, and it also applies to 960 -- box-initialized formals. 961 962 function Has_Fully_Defined_Profile (Subp : Entity_Id) return Boolean; 963 -- Determine whether the parameter types and the return type of Subp 964 -- are fully defined at the point of instantiation. 965 966 function Matching_Actual 967 (F : Entity_Id; 968 A_F : Entity_Id) return Node_Id; 969 -- Find actual that corresponds to a given a formal parameter. If the 970 -- actuals are positional, return the next one, if any. If the actuals 971 -- are named, scan the parameter associations to find the right one. 972 -- A_F is the corresponding entity in the analyzed generic,which is 973 -- placed on the selector name for ASIS use. 974 -- 975 -- In Ada 2005, a named association may be given with a box, in which 976 -- case Matching_Actual sets Found_Assoc to the generic association, 977 -- but return Empty for the actual itself. In this case the code below 978 -- creates a corresponding declaration for the formal. 979 980 function Partial_Parameterization return Boolean; 981 -- Ada 2005: if no match is found for a given formal, check if the 982 -- association for it includes a box, or whether the associations 983 -- include an Others clause. 984 985 procedure Process_Default (F : Entity_Id); 986 -- Add a copy of the declaration of generic formal F to the list of 987 -- associations, and add an explicit box association for F if there 988 -- is none yet, and the default comes from an Others_Choice. 989 990 function Renames_Standard_Subprogram (Subp : Entity_Id) return Boolean; 991 -- Determine whether Subp renames one of the subprograms defined in the 992 -- generated package Standard. 993 994 procedure Set_Analyzed_Formal; 995 -- Find the node in the generic copy that corresponds to a given formal. 996 -- The semantic information on this node is used to perform legality 997 -- checks on the actuals. Because semantic analysis can introduce some 998 -- anonymous entities or modify the declaration node itself, the 999 -- correspondence between the two lists is not one-one. In addition to 1000 -- anonymous types, the presence a formal equality will introduce an 1001 -- implicit declaration for the corresponding inequality. 1002 1003 ---------------------------------------- 1004 -- Check_Overloaded_Formal_Subprogram -- 1005 ---------------------------------------- 1006 1007 procedure Check_Overloaded_Formal_Subprogram (Formal : Entity_Id) is 1008 Temp_Formal : Entity_Id; 1009 1010 begin 1011 Temp_Formal := First (Formals); 1012 while Present (Temp_Formal) loop 1013 if Nkind (Temp_Formal) in N_Formal_Subprogram_Declaration 1014 and then Temp_Formal /= Formal 1015 and then 1016 Chars (Defining_Unit_Name (Specification (Formal))) = 1017 Chars (Defining_Unit_Name (Specification (Temp_Formal))) 1018 then 1019 if Present (Found_Assoc) then 1020 Error_Msg_N 1021 ("named association not allowed for overloaded formal", 1022 Found_Assoc); 1023 1024 else 1025 Error_Msg_N 1026 ("named association not allowed for overloaded formal", 1027 Others_Choice); 1028 end if; 1029 1030 Abandon_Instantiation (Instantiation_Node); 1031 end if; 1032 1033 Next (Temp_Formal); 1034 end loop; 1035 end Check_Overloaded_Formal_Subprogram; 1036 1037 ------------------------------- 1038 -- Has_Fully_Defined_Profile -- 1039 ------------------------------- 1040 1041 function Has_Fully_Defined_Profile (Subp : Entity_Id) return Boolean is 1042 function Is_Fully_Defined_Type (Typ : Entity_Id) return Boolean; 1043 -- Determine whethet type Typ is fully defined 1044 1045 --------------------------- 1046 -- Is_Fully_Defined_Type -- 1047 --------------------------- 1048 1049 function Is_Fully_Defined_Type (Typ : Entity_Id) return Boolean is 1050 begin 1051 -- A private type without a full view is not fully defined 1052 1053 if Is_Private_Type (Typ) 1054 and then No (Full_View (Typ)) 1055 then 1056 return False; 1057 1058 -- An incomplete type is never fully defined 1059 1060 elsif Is_Incomplete_Type (Typ) then 1061 return False; 1062 1063 -- All other types are fully defined 1064 1065 else 1066 return True; 1067 end if; 1068 end Is_Fully_Defined_Type; 1069 1070 -- Local declarations 1071 1072 Param : Entity_Id; 1073 1074 -- Start of processing for Has_Fully_Defined_Profile 1075 1076 begin 1077 -- Check the parameters 1078 1079 Param := First_Formal (Subp); 1080 while Present (Param) loop 1081 if not Is_Fully_Defined_Type (Etype (Param)) then 1082 return False; 1083 end if; 1084 1085 Next_Formal (Param); 1086 end loop; 1087 1088 -- Check the return type 1089 1090 return Is_Fully_Defined_Type (Etype (Subp)); 1091 end Has_Fully_Defined_Profile; 1092 1093 --------------------- 1094 -- Matching_Actual -- 1095 --------------------- 1096 1097 function Matching_Actual 1098 (F : Entity_Id; 1099 A_F : Entity_Id) return Node_Id 1100 is 1101 Prev : Node_Id; 1102 Act : Node_Id; 1103 1104 begin 1105 Is_Named_Assoc := False; 1106 1107 -- End of list of purely positional parameters 1108 1109 if No (Actual) or else Nkind (Actual) = N_Others_Choice then 1110 Found_Assoc := Empty; 1111 Act := Empty; 1112 1113 -- Case of positional parameter corresponding to current formal 1114 1115 elsif No (Selector_Name (Actual)) then 1116 Found_Assoc := Actual; 1117 Act := Explicit_Generic_Actual_Parameter (Actual); 1118 Num_Matched := Num_Matched + 1; 1119 Next (Actual); 1120 1121 -- Otherwise scan list of named actuals to find the one with the 1122 -- desired name. All remaining actuals have explicit names. 1123 1124 else 1125 Is_Named_Assoc := True; 1126 Found_Assoc := Empty; 1127 Act := Empty; 1128 Prev := Empty; 1129 1130 while Present (Actual) loop 1131 if Chars (Selector_Name (Actual)) = Chars (F) then 1132 Set_Entity (Selector_Name (Actual), A_F); 1133 Set_Etype (Selector_Name (Actual), Etype (A_F)); 1134 Generate_Reference (A_F, Selector_Name (Actual)); 1135 Found_Assoc := Actual; 1136 Act := Explicit_Generic_Actual_Parameter (Actual); 1137 Num_Matched := Num_Matched + 1; 1138 exit; 1139 end if; 1140 1141 Prev := Actual; 1142 Next (Actual); 1143 end loop; 1144 1145 -- Reset for subsequent searches. In most cases the named 1146 -- associations are in order. If they are not, we reorder them 1147 -- to avoid scanning twice the same actual. This is not just a 1148 -- question of efficiency: there may be multiple defaults with 1149 -- boxes that have the same name. In a nested instantiation we 1150 -- insert actuals for those defaults, and cannot rely on their 1151 -- names to disambiguate them. 1152 1153 if Actual = First_Named then 1154 Next (First_Named); 1155 1156 elsif Present (Actual) then 1157 Insert_Before (First_Named, Remove_Next (Prev)); 1158 end if; 1159 1160 Actual := First_Named; 1161 end if; 1162 1163 if Is_Entity_Name (Act) and then Present (Entity (Act)) then 1164 Set_Used_As_Generic_Actual (Entity (Act)); 1165 end if; 1166 1167 return Act; 1168 end Matching_Actual; 1169 1170 ------------------------------ 1171 -- Partial_Parameterization -- 1172 ------------------------------ 1173 1174 function Partial_Parameterization return Boolean is 1175 begin 1176 return Others_Present 1177 or else (Present (Found_Assoc) and then Box_Present (Found_Assoc)); 1178 end Partial_Parameterization; 1179 1180 --------------------- 1181 -- Process_Default -- 1182 --------------------- 1183 1184 procedure Process_Default (F : Entity_Id) is 1185 Loc : constant Source_Ptr := Sloc (I_Node); 1186 F_Id : constant Entity_Id := Defining_Entity (F); 1187 Decl : Node_Id; 1188 Default : Node_Id; 1189 Id : Entity_Id; 1190 1191 begin 1192 -- Append copy of formal declaration to associations, and create new 1193 -- defining identifier for it. 1194 1195 Decl := New_Copy_Tree (F); 1196 Id := Make_Defining_Identifier (Sloc (F_Id), Chars (F_Id)); 1197 1198 if Nkind (F) in N_Formal_Subprogram_Declaration then 1199 Set_Defining_Unit_Name (Specification (Decl), Id); 1200 1201 else 1202 Set_Defining_Identifier (Decl, Id); 1203 end if; 1204 1205 Append (Decl, Assoc); 1206 1207 if No (Found_Assoc) then 1208 Default := 1209 Make_Generic_Association (Loc, 1210 Selector_Name => 1211 New_Occurrence_Of (Id, Loc), 1212 Explicit_Generic_Actual_Parameter => Empty); 1213 Set_Box_Present (Default); 1214 Append (Default, Default_Formals); 1215 end if; 1216 end Process_Default; 1217 1218 --------------------------------- 1219 -- Renames_Standard_Subprogram -- 1220 --------------------------------- 1221 1222 function Renames_Standard_Subprogram (Subp : Entity_Id) return Boolean is 1223 Id : Entity_Id; 1224 1225 begin 1226 Id := Alias (Subp); 1227 while Present (Id) loop 1228 if Scope (Id) = Standard_Standard then 1229 return True; 1230 end if; 1231 1232 Id := Alias (Id); 1233 end loop; 1234 1235 return False; 1236 end Renames_Standard_Subprogram; 1237 1238 ------------------------- 1239 -- Set_Analyzed_Formal -- 1240 ------------------------- 1241 1242 procedure Set_Analyzed_Formal is 1243 Kind : Node_Kind; 1244 1245 begin 1246 while Present (Analyzed_Formal) loop 1247 Kind := Nkind (Analyzed_Formal); 1248 1249 case Nkind (Formal) is 1250 1251 when N_Formal_Subprogram_Declaration => 1252 exit when Kind in N_Formal_Subprogram_Declaration 1253 and then 1254 Chars 1255 (Defining_Unit_Name (Specification (Formal))) = 1256 Chars 1257 (Defining_Unit_Name (Specification (Analyzed_Formal))); 1258 1259 when N_Formal_Package_Declaration => 1260 exit when Nkind_In (Kind, N_Formal_Package_Declaration, 1261 N_Generic_Package_Declaration, 1262 N_Package_Declaration); 1263 1264 when N_Use_Package_Clause | N_Use_Type_Clause => exit; 1265 1266 when others => 1267 1268 -- Skip freeze nodes, and nodes inserted to replace 1269 -- unrecognized pragmas. 1270 1271 exit when 1272 Kind not in N_Formal_Subprogram_Declaration 1273 and then not Nkind_In (Kind, N_Subprogram_Declaration, 1274 N_Freeze_Entity, 1275 N_Null_Statement, 1276 N_Itype_Reference) 1277 and then Chars (Defining_Identifier (Formal)) = 1278 Chars (Defining_Identifier (Analyzed_Formal)); 1279 end case; 1280 1281 Next (Analyzed_Formal); 1282 end loop; 1283 end Set_Analyzed_Formal; 1284 1285 -- Start of processing for Analyze_Associations 1286 1287 begin 1288 Actuals := Generic_Associations (I_Node); 1289 1290 if Present (Actuals) then 1291 1292 -- Check for an Others choice, indicating a partial parameterization 1293 -- for a formal package. 1294 1295 Actual := First (Actuals); 1296 while Present (Actual) loop 1297 if Nkind (Actual) = N_Others_Choice then 1298 Others_Present := True; 1299 Others_Choice := Actual; 1300 1301 if Present (Next (Actual)) then 1302 Error_Msg_N ("others must be last association", Actual); 1303 end if; 1304 1305 -- This subprogram is used both for formal packages and for 1306 -- instantiations. For the latter, associations must all be 1307 -- explicit. 1308 1309 if Nkind (I_Node) /= N_Formal_Package_Declaration 1310 and then Comes_From_Source (I_Node) 1311 then 1312 Error_Msg_N 1313 ("others association not allowed in an instance", 1314 Actual); 1315 end if; 1316 1317 -- In any case, nothing to do after the others association 1318 1319 exit; 1320 1321 elsif Box_Present (Actual) 1322 and then Comes_From_Source (I_Node) 1323 and then Nkind (I_Node) /= N_Formal_Package_Declaration 1324 then 1325 Error_Msg_N 1326 ("box association not allowed in an instance", Actual); 1327 end if; 1328 1329 Next (Actual); 1330 end loop; 1331 1332 -- If named associations are present, save first named association 1333 -- (it may of course be Empty) to facilitate subsequent name search. 1334 1335 First_Named := First (Actuals); 1336 while Present (First_Named) 1337 and then Nkind (First_Named) /= N_Others_Choice 1338 and then No (Selector_Name (First_Named)) 1339 loop 1340 Num_Actuals := Num_Actuals + 1; 1341 Next (First_Named); 1342 end loop; 1343 end if; 1344 1345 Named := First_Named; 1346 while Present (Named) loop 1347 if Nkind (Named) /= N_Others_Choice 1348 and then No (Selector_Name (Named)) 1349 then 1350 Error_Msg_N ("invalid positional actual after named one", Named); 1351 Abandon_Instantiation (Named); 1352 end if; 1353 1354 -- A named association may lack an actual parameter, if it was 1355 -- introduced for a default subprogram that turns out to be local 1356 -- to the outer instantiation. 1357 1358 if Nkind (Named) /= N_Others_Choice 1359 and then Present (Explicit_Generic_Actual_Parameter (Named)) 1360 then 1361 Num_Actuals := Num_Actuals + 1; 1362 end if; 1363 1364 Next (Named); 1365 end loop; 1366 1367 if Present (Formals) then 1368 Formal := First_Non_Pragma (Formals); 1369 Analyzed_Formal := First_Non_Pragma (F_Copy); 1370 1371 if Present (Actuals) then 1372 Actual := First (Actuals); 1373 1374 -- All formals should have default values 1375 1376 else 1377 Actual := Empty; 1378 end if; 1379 1380 while Present (Formal) loop 1381 Set_Analyzed_Formal; 1382 Saved_Formal := Next_Non_Pragma (Formal); 1383 1384 case Nkind (Formal) is 1385 when N_Formal_Object_Declaration => 1386 Match := 1387 Matching_Actual 1388 (Defining_Identifier (Formal), 1389 Defining_Identifier (Analyzed_Formal)); 1390 1391 if No (Match) and then Partial_Parameterization then 1392 Process_Default (Formal); 1393 1394 else 1395 Append_List 1396 (Instantiate_Object (Formal, Match, Analyzed_Formal), 1397 Assoc); 1398 1399 -- For a defaulted in_parameter, create an entry in the 1400 -- the list of defaulted actuals, for GNATProve use. Do 1401 -- not included these defaults for an instance nested 1402 -- within a generic, because the defaults are also used 1403 -- in the analysis of the enclosing generic, and only 1404 -- defaulted subprograms are relevant there. 1405 1406 if No (Match) and then not Inside_A_Generic then 1407 Append_To (Default_Actuals, 1408 Make_Generic_Association (Sloc (I_Node), 1409 Selector_Name => 1410 New_Occurrence_Of 1411 (Defining_Identifier (Formal), Sloc (I_Node)), 1412 Explicit_Generic_Actual_Parameter => 1413 New_Copy_Tree (Default_Expression (Formal)))); 1414 end if; 1415 end if; 1416 1417 -- If the object is a call to an expression function, this 1418 -- is a freezing point for it. 1419 1420 if Is_Entity_Name (Match) 1421 and then Present (Entity (Match)) 1422 and then Nkind 1423 (Original_Node (Unit_Declaration_Node (Entity (Match)))) 1424 = N_Expression_Function 1425 then 1426 Append_Elmt (Entity (Match), Actuals_To_Freeze); 1427 end if; 1428 1429 when N_Formal_Type_Declaration => 1430 Match := 1431 Matching_Actual 1432 (Defining_Identifier (Formal), 1433 Defining_Identifier (Analyzed_Formal)); 1434 1435 if No (Match) then 1436 if Partial_Parameterization then 1437 Process_Default (Formal); 1438 1439 else 1440 Error_Msg_Sloc := Sloc (Gen_Unit); 1441 Error_Msg_NE 1442 ("missing actual&", 1443 Instantiation_Node, Defining_Identifier (Formal)); 1444 Error_Msg_NE 1445 ("\in instantiation of & declared#", 1446 Instantiation_Node, Gen_Unit); 1447 Abandon_Instantiation (Instantiation_Node); 1448 end if; 1449 1450 else 1451 Analyze (Match); 1452 Append_List 1453 (Instantiate_Type 1454 (Formal, Match, Analyzed_Formal, Assoc), 1455 Assoc); 1456 1457 -- An instantiation is a freeze point for the actuals, 1458 -- unless this is a rewritten formal package, or the 1459 -- formal is an Ada 2012 formal incomplete type. 1460 1461 if Nkind (I_Node) = N_Formal_Package_Declaration 1462 or else 1463 (Ada_Version >= Ada_2012 1464 and then 1465 Ekind (Defining_Identifier (Analyzed_Formal)) = 1466 E_Incomplete_Type) 1467 then 1468 null; 1469 1470 else 1471 Append_Elmt (Entity (Match), Actuals_To_Freeze); 1472 end if; 1473 end if; 1474 1475 -- A remote access-to-class-wide type is not a legal actual 1476 -- for a generic formal of an access type (E.2.2(17/2)). 1477 -- In GNAT an exception to this rule is introduced when 1478 -- the formal is marked as remote using implementation 1479 -- defined aspect/pragma Remote_Access_Type. In that case 1480 -- the actual must be remote as well. 1481 1482 -- If the current instantiation is the construction of a 1483 -- local copy for a formal package the actuals may be 1484 -- defaulted, and there is no matching actual to check. 1485 1486 if Nkind (Analyzed_Formal) = N_Formal_Type_Declaration 1487 and then 1488 Nkind (Formal_Type_Definition (Analyzed_Formal)) = 1489 N_Access_To_Object_Definition 1490 and then Present (Match) 1491 then 1492 declare 1493 Formal_Ent : constant Entity_Id := 1494 Defining_Identifier (Analyzed_Formal); 1495 begin 1496 if Is_Remote_Access_To_Class_Wide_Type (Entity (Match)) 1497 = Is_Remote_Types (Formal_Ent) 1498 then 1499 -- Remoteness of formal and actual match 1500 1501 null; 1502 1503 elsif Is_Remote_Types (Formal_Ent) then 1504 1505 -- Remote formal, non-remote actual 1506 1507 Error_Msg_NE 1508 ("actual for& must be remote", Match, Formal_Ent); 1509 1510 else 1511 -- Non-remote formal, remote actual 1512 1513 Error_Msg_NE 1514 ("actual for& may not be remote", 1515 Match, Formal_Ent); 1516 end if; 1517 end; 1518 end if; 1519 1520 when N_Formal_Subprogram_Declaration => 1521 Match := 1522 Matching_Actual 1523 (Defining_Unit_Name (Specification (Formal)), 1524 Defining_Unit_Name (Specification (Analyzed_Formal))); 1525 1526 -- If the formal subprogram has the same name as another 1527 -- formal subprogram of the generic, then a named 1528 -- association is illegal (12.3(9)). Exclude named 1529 -- associations that are generated for a nested instance. 1530 1531 if Present (Match) 1532 and then Is_Named_Assoc 1533 and then Comes_From_Source (Found_Assoc) 1534 then 1535 Check_Overloaded_Formal_Subprogram (Formal); 1536 end if; 1537 1538 -- If there is no corresponding actual, this may be case 1539 -- of partial parameterization, or else the formal has a 1540 -- default or a box. 1541 1542 if No (Match) and then Partial_Parameterization then 1543 Process_Default (Formal); 1544 1545 if Nkind (I_Node) = N_Formal_Package_Declaration then 1546 Check_Overloaded_Formal_Subprogram (Formal); 1547 end if; 1548 1549 else 1550 Append_To (Assoc, 1551 Instantiate_Formal_Subprogram 1552 (Formal, Match, Analyzed_Formal)); 1553 1554 -- An instantiation is a freeze point for the actuals, 1555 -- unless this is a rewritten formal package. 1556 1557 if Nkind (I_Node) /= N_Formal_Package_Declaration 1558 and then Nkind (Match) = N_Identifier 1559 and then Is_Subprogram (Entity (Match)) 1560 1561 -- The actual subprogram may rename a routine defined 1562 -- in Standard. Avoid freezing such renamings because 1563 -- subprograms coming from Standard cannot be frozen. 1564 1565 and then 1566 not Renames_Standard_Subprogram (Entity (Match)) 1567 1568 -- If the actual subprogram comes from a different 1569 -- unit, it is already frozen, either by a body in 1570 -- that unit or by the end of the declarative part 1571 -- of the unit. This check avoids the freezing of 1572 -- subprograms defined in Standard which are used 1573 -- as generic actuals. 1574 1575 and then In_Same_Code_Unit (Entity (Match), I_Node) 1576 and then Has_Fully_Defined_Profile (Entity (Match)) 1577 then 1578 -- Mark the subprogram as having a delayed freeze 1579 -- since this may be an out-of-order action. 1580 1581 Set_Has_Delayed_Freeze (Entity (Match)); 1582 Append_Elmt (Entity (Match), Actuals_To_Freeze); 1583 end if; 1584 end if; 1585 1586 -- If this is a nested generic, preserve default for later 1587 -- instantiations. We do this as well for GNATProve use, 1588 -- so that the list of generic associations is complete. 1589 1590 if No (Match) and then Box_Present (Formal) then 1591 declare 1592 Subp : constant Entity_Id := 1593 Defining_Unit_Name (Specification (Last (Assoc))); 1594 1595 begin 1596 Append_To (Default_Actuals, 1597 Make_Generic_Association (Sloc (I_Node), 1598 Selector_Name => 1599 New_Occurrence_Of (Subp, Sloc (I_Node)), 1600 Explicit_Generic_Actual_Parameter => 1601 New_Occurrence_Of (Subp, Sloc (I_Node)))); 1602 end; 1603 end if; 1604 1605 when N_Formal_Package_Declaration => 1606 Match := 1607 Matching_Actual 1608 (Defining_Identifier (Formal), 1609 Defining_Identifier (Original_Node (Analyzed_Formal))); 1610 1611 if No (Match) then 1612 if Partial_Parameterization then 1613 Process_Default (Formal); 1614 1615 else 1616 Error_Msg_Sloc := Sloc (Gen_Unit); 1617 Error_Msg_NE 1618 ("missing actual&", 1619 Instantiation_Node, Defining_Identifier (Formal)); 1620 Error_Msg_NE 1621 ("\in instantiation of & declared#", 1622 Instantiation_Node, Gen_Unit); 1623 1624 Abandon_Instantiation (Instantiation_Node); 1625 end if; 1626 1627 else 1628 Analyze (Match); 1629 Append_List 1630 (Instantiate_Formal_Package 1631 (Formal, Match, Analyzed_Formal), 1632 Assoc); 1633 end if; 1634 1635 -- For use type and use package appearing in the generic part, 1636 -- we have already copied them, so we can just move them where 1637 -- they belong (we mustn't recopy them since this would mess up 1638 -- the Sloc values). 1639 1640 when N_Use_Package_Clause | 1641 N_Use_Type_Clause => 1642 if Nkind (Original_Node (I_Node)) = 1643 N_Formal_Package_Declaration 1644 then 1645 Append (New_Copy_Tree (Formal), Assoc); 1646 else 1647 Remove (Formal); 1648 Append (Formal, Assoc); 1649 end if; 1650 1651 when others => 1652 raise Program_Error; 1653 1654 end case; 1655 1656 Formal := Saved_Formal; 1657 Next_Non_Pragma (Analyzed_Formal); 1658 end loop; 1659 1660 if Num_Actuals > Num_Matched then 1661 Error_Msg_Sloc := Sloc (Gen_Unit); 1662 1663 if Present (Selector_Name (Actual)) then 1664 Error_Msg_NE 1665 ("unmatched actual &", Actual, Selector_Name (Actual)); 1666 Error_Msg_NE 1667 ("\in instantiation of & declared#", Actual, Gen_Unit); 1668 else 1669 Error_Msg_NE 1670 ("unmatched actual in instantiation of & declared#", 1671 Actual, Gen_Unit); 1672 end if; 1673 end if; 1674 1675 elsif Present (Actuals) then 1676 Error_Msg_N 1677 ("too many actuals in generic instantiation", Instantiation_Node); 1678 end if; 1679 1680 -- An instantiation freezes all generic actuals. The only exceptions 1681 -- to this are incomplete types and subprograms which are not fully 1682 -- defined at the point of instantiation. 1683 1684 declare 1685 Elmt : Elmt_Id := First_Elmt (Actuals_To_Freeze); 1686 begin 1687 while Present (Elmt) loop 1688 Freeze_Before (I_Node, Node (Elmt)); 1689 Next_Elmt (Elmt); 1690 end loop; 1691 end; 1692 1693 -- If there are default subprograms, normalize the tree by adding 1694 -- explicit associations for them. This is required if the instance 1695 -- appears within a generic. 1696 1697 if not Is_Empty_List (Default_Actuals) then 1698 declare 1699 Default : Node_Id; 1700 1701 begin 1702 Default := First (Default_Actuals); 1703 while Present (Default) loop 1704 Mark_Rewrite_Insertion (Default); 1705 Next (Default); 1706 end loop; 1707 1708 if No (Actuals) then 1709 Set_Generic_Associations (I_Node, Default_Actuals); 1710 else 1711 Append_List_To (Actuals, Default_Actuals); 1712 end if; 1713 end; 1714 end if; 1715 1716 -- If this is a formal package, normalize the parameter list by adding 1717 -- explicit box associations for the formals that are covered by an 1718 -- Others_Choice. 1719 1720 if not Is_Empty_List (Default_Formals) then 1721 Append_List (Default_Formals, Formals); 1722 end if; 1723 1724 return Assoc; 1725 end Analyze_Associations; 1726 1727 ------------------------------- 1728 -- Analyze_Formal_Array_Type -- 1729 ------------------------------- 1730 1731 procedure Analyze_Formal_Array_Type 1732 (T : in out Entity_Id; 1733 Def : Node_Id) 1734 is 1735 DSS : Node_Id; 1736 1737 begin 1738 -- Treated like a non-generic array declaration, with additional 1739 -- semantic checks. 1740 1741 Enter_Name (T); 1742 1743 if Nkind (Def) = N_Constrained_Array_Definition then 1744 DSS := First (Discrete_Subtype_Definitions (Def)); 1745 while Present (DSS) loop 1746 if Nkind_In (DSS, N_Subtype_Indication, 1747 N_Range, 1748 N_Attribute_Reference) 1749 then 1750 Error_Msg_N ("only a subtype mark is allowed in a formal", DSS); 1751 end if; 1752 1753 Next (DSS); 1754 end loop; 1755 end if; 1756 1757 Array_Type_Declaration (T, Def); 1758 Set_Is_Generic_Type (Base_Type (T)); 1759 1760 if Ekind (Component_Type (T)) = E_Incomplete_Type 1761 and then No (Full_View (Component_Type (T))) 1762 then 1763 Error_Msg_N ("premature usage of incomplete type", Def); 1764 1765 -- Check that range constraint is not allowed on the component type 1766 -- of a generic formal array type (AARM 12.5.3(3)) 1767 1768 elsif Is_Internal (Component_Type (T)) 1769 and then Present (Subtype_Indication (Component_Definition (Def))) 1770 and then Nkind (Original_Node 1771 (Subtype_Indication (Component_Definition (Def)))) = 1772 N_Subtype_Indication 1773 then 1774 Error_Msg_N 1775 ("in a formal, a subtype indication can only be " 1776 & "a subtype mark (RM 12.5.3(3))", 1777 Subtype_Indication (Component_Definition (Def))); 1778 end if; 1779 1780 end Analyze_Formal_Array_Type; 1781 1782 --------------------------------------------- 1783 -- Analyze_Formal_Decimal_Fixed_Point_Type -- 1784 --------------------------------------------- 1785 1786 -- As for other generic types, we create a valid type representation with 1787 -- legal but arbitrary attributes, whose values are never considered 1788 -- static. For all scalar types we introduce an anonymous base type, with 1789 -- the same attributes. We choose the corresponding integer type to be 1790 -- Standard_Integer. 1791 -- Here and in other similar routines, the Sloc of the generated internal 1792 -- type must be the same as the sloc of the defining identifier of the 1793 -- formal type declaration, to provide proper source navigation. 1794 1795 procedure Analyze_Formal_Decimal_Fixed_Point_Type 1796 (T : Entity_Id; 1797 Def : Node_Id) 1798 is 1799 Loc : constant Source_Ptr := Sloc (Def); 1800 1801 Base : constant Entity_Id := 1802 New_Internal_Entity 1803 (E_Decimal_Fixed_Point_Type, 1804 Current_Scope, 1805 Sloc (Defining_Identifier (Parent (Def))), 'G'); 1806 1807 Int_Base : constant Entity_Id := Standard_Integer; 1808 Delta_Val : constant Ureal := Ureal_1; 1809 Digs_Val : constant Uint := Uint_6; 1810 1811 function Make_Dummy_Bound return Node_Id; 1812 -- Return a properly typed universal real literal to use as a bound 1813 1814 ---------------------- 1815 -- Make_Dummy_Bound -- 1816 ---------------------- 1817 1818 function Make_Dummy_Bound return Node_Id is 1819 Bound : constant Node_Id := Make_Real_Literal (Loc, Ureal_1); 1820 begin 1821 Set_Etype (Bound, Universal_Real); 1822 return Bound; 1823 end Make_Dummy_Bound; 1824 1825 -- Start of processing for Analyze_Formal_Decimal_Fixed_Point_Type 1826 1827 begin 1828 Enter_Name (T); 1829 1830 Set_Etype (Base, Base); 1831 Set_Size_Info (Base, Int_Base); 1832 Set_RM_Size (Base, RM_Size (Int_Base)); 1833 Set_First_Rep_Item (Base, First_Rep_Item (Int_Base)); 1834 Set_Digits_Value (Base, Digs_Val); 1835 Set_Delta_Value (Base, Delta_Val); 1836 Set_Small_Value (Base, Delta_Val); 1837 Set_Scalar_Range (Base, 1838 Make_Range (Loc, 1839 Low_Bound => Make_Dummy_Bound, 1840 High_Bound => Make_Dummy_Bound)); 1841 1842 Set_Is_Generic_Type (Base); 1843 Set_Parent (Base, Parent (Def)); 1844 1845 Set_Ekind (T, E_Decimal_Fixed_Point_Subtype); 1846 Set_Etype (T, Base); 1847 Set_Size_Info (T, Int_Base); 1848 Set_RM_Size (T, RM_Size (Int_Base)); 1849 Set_First_Rep_Item (T, First_Rep_Item (Int_Base)); 1850 Set_Digits_Value (T, Digs_Val); 1851 Set_Delta_Value (T, Delta_Val); 1852 Set_Small_Value (T, Delta_Val); 1853 Set_Scalar_Range (T, Scalar_Range (Base)); 1854 Set_Is_Constrained (T); 1855 1856 Check_Restriction (No_Fixed_Point, Def); 1857 end Analyze_Formal_Decimal_Fixed_Point_Type; 1858 1859 ------------------------------------------- 1860 -- Analyze_Formal_Derived_Interface_Type -- 1861 ------------------------------------------- 1862 1863 procedure Analyze_Formal_Derived_Interface_Type 1864 (N : Node_Id; 1865 T : Entity_Id; 1866 Def : Node_Id) 1867 is 1868 Loc : constant Source_Ptr := Sloc (Def); 1869 1870 begin 1871 -- Rewrite as a type declaration of a derived type. This ensures that 1872 -- the interface list and primitive operations are properly captured. 1873 1874 Rewrite (N, 1875 Make_Full_Type_Declaration (Loc, 1876 Defining_Identifier => T, 1877 Type_Definition => Def)); 1878 Analyze (N); 1879 Set_Is_Generic_Type (T); 1880 end Analyze_Formal_Derived_Interface_Type; 1881 1882 --------------------------------- 1883 -- Analyze_Formal_Derived_Type -- 1884 --------------------------------- 1885 1886 procedure Analyze_Formal_Derived_Type 1887 (N : Node_Id; 1888 T : Entity_Id; 1889 Def : Node_Id) 1890 is 1891 Loc : constant Source_Ptr := Sloc (Def); 1892 Unk_Disc : constant Boolean := Unknown_Discriminants_Present (N); 1893 New_N : Node_Id; 1894 1895 begin 1896 Set_Is_Generic_Type (T); 1897 1898 if Private_Present (Def) then 1899 New_N := 1900 Make_Private_Extension_Declaration (Loc, 1901 Defining_Identifier => T, 1902 Discriminant_Specifications => Discriminant_Specifications (N), 1903 Unknown_Discriminants_Present => Unk_Disc, 1904 Subtype_Indication => Subtype_Mark (Def), 1905 Interface_List => Interface_List (Def)); 1906 1907 Set_Abstract_Present (New_N, Abstract_Present (Def)); 1908 Set_Limited_Present (New_N, Limited_Present (Def)); 1909 Set_Synchronized_Present (New_N, Synchronized_Present (Def)); 1910 1911 else 1912 New_N := 1913 Make_Full_Type_Declaration (Loc, 1914 Defining_Identifier => T, 1915 Discriminant_Specifications => 1916 Discriminant_Specifications (Parent (T)), 1917 Type_Definition => 1918 Make_Derived_Type_Definition (Loc, 1919 Subtype_Indication => Subtype_Mark (Def))); 1920 1921 Set_Abstract_Present 1922 (Type_Definition (New_N), Abstract_Present (Def)); 1923 Set_Limited_Present 1924 (Type_Definition (New_N), Limited_Present (Def)); 1925 end if; 1926 1927 Rewrite (N, New_N); 1928 Analyze (N); 1929 1930 if Unk_Disc then 1931 if not Is_Composite_Type (T) then 1932 Error_Msg_N 1933 ("unknown discriminants not allowed for elementary types", N); 1934 else 1935 Set_Has_Unknown_Discriminants (T); 1936 Set_Is_Constrained (T, False); 1937 end if; 1938 end if; 1939 1940 -- If the parent type has a known size, so does the formal, which makes 1941 -- legal representation clauses that involve the formal. 1942 1943 Set_Size_Known_At_Compile_Time 1944 (T, Size_Known_At_Compile_Time (Entity (Subtype_Mark (Def)))); 1945 end Analyze_Formal_Derived_Type; 1946 1947 ---------------------------------- 1948 -- Analyze_Formal_Discrete_Type -- 1949 ---------------------------------- 1950 1951 -- The operations defined for a discrete types are those of an enumeration 1952 -- type. The size is set to an arbitrary value, for use in analyzing the 1953 -- generic unit. 1954 1955 procedure Analyze_Formal_Discrete_Type (T : Entity_Id; Def : Node_Id) is 1956 Loc : constant Source_Ptr := Sloc (Def); 1957 Lo : Node_Id; 1958 Hi : Node_Id; 1959 1960 Base : constant Entity_Id := 1961 New_Internal_Entity 1962 (E_Floating_Point_Type, Current_Scope, 1963 Sloc (Defining_Identifier (Parent (Def))), 'G'); 1964 1965 begin 1966 Enter_Name (T); 1967 Set_Ekind (T, E_Enumeration_Subtype); 1968 Set_Etype (T, Base); 1969 Init_Size (T, 8); 1970 Init_Alignment (T); 1971 Set_Is_Generic_Type (T); 1972 Set_Is_Constrained (T); 1973 1974 -- For semantic analysis, the bounds of the type must be set to some 1975 -- non-static value. The simplest is to create attribute nodes for those 1976 -- bounds, that refer to the type itself. These bounds are never 1977 -- analyzed but serve as place-holders. 1978 1979 Lo := 1980 Make_Attribute_Reference (Loc, 1981 Attribute_Name => Name_First, 1982 Prefix => New_Occurrence_Of (T, Loc)); 1983 Set_Etype (Lo, T); 1984 1985 Hi := 1986 Make_Attribute_Reference (Loc, 1987 Attribute_Name => Name_Last, 1988 Prefix => New_Occurrence_Of (T, Loc)); 1989 Set_Etype (Hi, T); 1990 1991 Set_Scalar_Range (T, 1992 Make_Range (Loc, 1993 Low_Bound => Lo, 1994 High_Bound => Hi)); 1995 1996 Set_Ekind (Base, E_Enumeration_Type); 1997 Set_Etype (Base, Base); 1998 Init_Size (Base, 8); 1999 Init_Alignment (Base); 2000 Set_Is_Generic_Type (Base); 2001 Set_Scalar_Range (Base, Scalar_Range (T)); 2002 Set_Parent (Base, Parent (Def)); 2003 end Analyze_Formal_Discrete_Type; 2004 2005 ---------------------------------- 2006 -- Analyze_Formal_Floating_Type -- 2007 --------------------------------- 2008 2009 procedure Analyze_Formal_Floating_Type (T : Entity_Id; Def : Node_Id) is 2010 Base : constant Entity_Id := 2011 New_Internal_Entity 2012 (E_Floating_Point_Type, Current_Scope, 2013 Sloc (Defining_Identifier (Parent (Def))), 'G'); 2014 2015 begin 2016 -- The various semantic attributes are taken from the predefined type 2017 -- Float, just so that all of them are initialized. Their values are 2018 -- never used because no constant folding or expansion takes place in 2019 -- the generic itself. 2020 2021 Enter_Name (T); 2022 Set_Ekind (T, E_Floating_Point_Subtype); 2023 Set_Etype (T, Base); 2024 Set_Size_Info (T, (Standard_Float)); 2025 Set_RM_Size (T, RM_Size (Standard_Float)); 2026 Set_Digits_Value (T, Digits_Value (Standard_Float)); 2027 Set_Scalar_Range (T, Scalar_Range (Standard_Float)); 2028 Set_Is_Constrained (T); 2029 2030 Set_Is_Generic_Type (Base); 2031 Set_Etype (Base, Base); 2032 Set_Size_Info (Base, (Standard_Float)); 2033 Set_RM_Size (Base, RM_Size (Standard_Float)); 2034 Set_Digits_Value (Base, Digits_Value (Standard_Float)); 2035 Set_Scalar_Range (Base, Scalar_Range (Standard_Float)); 2036 Set_Parent (Base, Parent (Def)); 2037 2038 Check_Restriction (No_Floating_Point, Def); 2039 end Analyze_Formal_Floating_Type; 2040 2041 ----------------------------------- 2042 -- Analyze_Formal_Interface_Type;-- 2043 ----------------------------------- 2044 2045 procedure Analyze_Formal_Interface_Type 2046 (N : Node_Id; 2047 T : Entity_Id; 2048 Def : Node_Id) 2049 is 2050 Loc : constant Source_Ptr := Sloc (N); 2051 New_N : Node_Id; 2052 2053 begin 2054 New_N := 2055 Make_Full_Type_Declaration (Loc, 2056 Defining_Identifier => T, 2057 Type_Definition => Def); 2058 2059 Rewrite (N, New_N); 2060 Analyze (N); 2061 Set_Is_Generic_Type (T); 2062 end Analyze_Formal_Interface_Type; 2063 2064 --------------------------------- 2065 -- Analyze_Formal_Modular_Type -- 2066 --------------------------------- 2067 2068 procedure Analyze_Formal_Modular_Type (T : Entity_Id; Def : Node_Id) is 2069 begin 2070 -- Apart from their entity kind, generic modular types are treated like 2071 -- signed integer types, and have the same attributes. 2072 2073 Analyze_Formal_Signed_Integer_Type (T, Def); 2074 Set_Ekind (T, E_Modular_Integer_Subtype); 2075 Set_Ekind (Etype (T), E_Modular_Integer_Type); 2076 2077 end Analyze_Formal_Modular_Type; 2078 2079 --------------------------------------- 2080 -- Analyze_Formal_Object_Declaration -- 2081 --------------------------------------- 2082 2083 procedure Analyze_Formal_Object_Declaration (N : Node_Id) is 2084 E : constant Node_Id := Default_Expression (N); 2085 Id : constant Node_Id := Defining_Identifier (N); 2086 K : Entity_Kind; 2087 T : Node_Id; 2088 2089 begin 2090 Enter_Name (Id); 2091 2092 -- Determine the mode of the formal object 2093 2094 if Out_Present (N) then 2095 K := E_Generic_In_Out_Parameter; 2096 2097 if not In_Present (N) then 2098 Error_Msg_N ("formal generic objects cannot have mode OUT", N); 2099 end if; 2100 2101 else 2102 K := E_Generic_In_Parameter; 2103 end if; 2104 2105 if Present (Subtype_Mark (N)) then 2106 Find_Type (Subtype_Mark (N)); 2107 T := Entity (Subtype_Mark (N)); 2108 2109 -- Verify that there is no redundant null exclusion 2110 2111 if Null_Exclusion_Present (N) then 2112 if not Is_Access_Type (T) then 2113 Error_Msg_N 2114 ("null exclusion can only apply to an access type", N); 2115 2116 elsif Can_Never_Be_Null (T) then 2117 Error_Msg_NE 2118 ("`NOT NULL` not allowed (& already excludes null)", N, T); 2119 end if; 2120 end if; 2121 2122 -- Ada 2005 (AI-423): Formal object with an access definition 2123 2124 else 2125 Check_Access_Definition (N); 2126 T := Access_Definition 2127 (Related_Nod => N, 2128 N => Access_Definition (N)); 2129 end if; 2130 2131 if Ekind (T) = E_Incomplete_Type then 2132 declare 2133 Error_Node : Node_Id; 2134 2135 begin 2136 if Present (Subtype_Mark (N)) then 2137 Error_Node := Subtype_Mark (N); 2138 else 2139 Check_Access_Definition (N); 2140 Error_Node := Access_Definition (N); 2141 end if; 2142 2143 Error_Msg_N ("premature usage of incomplete type", Error_Node); 2144 end; 2145 end if; 2146 2147 if K = E_Generic_In_Parameter then 2148 2149 -- Ada 2005 (AI-287): Limited aggregates allowed in generic formals 2150 2151 if Ada_Version < Ada_2005 and then Is_Limited_Type (T) then 2152 Error_Msg_N 2153 ("generic formal of mode IN must not be of limited type", N); 2154 Explain_Limited_Type (T, N); 2155 end if; 2156 2157 if Is_Abstract_Type (T) then 2158 Error_Msg_N 2159 ("generic formal of mode IN must not be of abstract type", N); 2160 end if; 2161 2162 if Present (E) then 2163 Preanalyze_Spec_Expression (E, T); 2164 2165 if Is_Limited_Type (T) and then not OK_For_Limited_Init (T, E) then 2166 Error_Msg_N 2167 ("initialization not allowed for limited types", E); 2168 Explain_Limited_Type (T, E); 2169 end if; 2170 end if; 2171 2172 Set_Ekind (Id, K); 2173 Set_Etype (Id, T); 2174 2175 -- Case of generic IN OUT parameter 2176 2177 else 2178 -- If the formal has an unconstrained type, construct its actual 2179 -- subtype, as is done for subprogram formals. In this fashion, all 2180 -- its uses can refer to specific bounds. 2181 2182 Set_Ekind (Id, K); 2183 Set_Etype (Id, T); 2184 2185 if (Is_Array_Type (T) and then not Is_Constrained (T)) 2186 or else (Ekind (T) = E_Record_Type and then Has_Discriminants (T)) 2187 then 2188 declare 2189 Non_Freezing_Ref : constant Node_Id := 2190 New_Occurrence_Of (Id, Sloc (Id)); 2191 Decl : Node_Id; 2192 2193 begin 2194 -- Make sure the actual subtype doesn't generate bogus freezing 2195 2196 Set_Must_Not_Freeze (Non_Freezing_Ref); 2197 Decl := Build_Actual_Subtype (T, Non_Freezing_Ref); 2198 Insert_Before_And_Analyze (N, Decl); 2199 Set_Actual_Subtype (Id, Defining_Identifier (Decl)); 2200 end; 2201 else 2202 Set_Actual_Subtype (Id, T); 2203 end if; 2204 2205 if Present (E) then 2206 Error_Msg_N 2207 ("initialization not allowed for `IN OUT` formals", N); 2208 end if; 2209 end if; 2210 2211 if Has_Aspects (N) then 2212 Analyze_Aspect_Specifications (N, Id); 2213 end if; 2214 end Analyze_Formal_Object_Declaration; 2215 2216 ---------------------------------------------- 2217 -- Analyze_Formal_Ordinary_Fixed_Point_Type -- 2218 ---------------------------------------------- 2219 2220 procedure Analyze_Formal_Ordinary_Fixed_Point_Type 2221 (T : Entity_Id; 2222 Def : Node_Id) 2223 is 2224 Loc : constant Source_Ptr := Sloc (Def); 2225 Base : constant Entity_Id := 2226 New_Internal_Entity 2227 (E_Ordinary_Fixed_Point_Type, Current_Scope, 2228 Sloc (Defining_Identifier (Parent (Def))), 'G'); 2229 2230 begin 2231 -- The semantic attributes are set for completeness only, their values 2232 -- will never be used, since all properties of the type are non-static. 2233 2234 Enter_Name (T); 2235 Set_Ekind (T, E_Ordinary_Fixed_Point_Subtype); 2236 Set_Etype (T, Base); 2237 Set_Size_Info (T, Standard_Integer); 2238 Set_RM_Size (T, RM_Size (Standard_Integer)); 2239 Set_Small_Value (T, Ureal_1); 2240 Set_Delta_Value (T, Ureal_1); 2241 Set_Scalar_Range (T, 2242 Make_Range (Loc, 2243 Low_Bound => Make_Real_Literal (Loc, Ureal_1), 2244 High_Bound => Make_Real_Literal (Loc, Ureal_1))); 2245 Set_Is_Constrained (T); 2246 2247 Set_Is_Generic_Type (Base); 2248 Set_Etype (Base, Base); 2249 Set_Size_Info (Base, Standard_Integer); 2250 Set_RM_Size (Base, RM_Size (Standard_Integer)); 2251 Set_Small_Value (Base, Ureal_1); 2252 Set_Delta_Value (Base, Ureal_1); 2253 Set_Scalar_Range (Base, Scalar_Range (T)); 2254 Set_Parent (Base, Parent (Def)); 2255 2256 Check_Restriction (No_Fixed_Point, Def); 2257 end Analyze_Formal_Ordinary_Fixed_Point_Type; 2258 2259 ---------------------------------------- 2260 -- Analyze_Formal_Package_Declaration -- 2261 ---------------------------------------- 2262 2263 procedure Analyze_Formal_Package_Declaration (N : Node_Id) is 2264 Loc : constant Source_Ptr := Sloc (N); 2265 Pack_Id : constant Entity_Id := Defining_Identifier (N); 2266 Formal : Entity_Id; 2267 Gen_Id : constant Node_Id := Name (N); 2268 Gen_Decl : Node_Id; 2269 Gen_Unit : Entity_Id; 2270 New_N : Node_Id; 2271 Parent_Installed : Boolean := False; 2272 Renaming : Node_Id; 2273 Parent_Instance : Entity_Id; 2274 Renaming_In_Par : Entity_Id; 2275 Associations : Boolean := True; 2276 2277 Vis_Prims_List : Elist_Id := No_Elist; 2278 -- List of primitives made temporarily visible in the instantiation 2279 -- to match the visibility of the formal type 2280 2281 function Build_Local_Package return Node_Id; 2282 -- The formal package is rewritten so that its parameters are replaced 2283 -- with corresponding declarations. For parameters with bona fide 2284 -- associations these declarations are created by Analyze_Associations 2285 -- as for a regular instantiation. For boxed parameters, we preserve 2286 -- the formal declarations and analyze them, in order to introduce 2287 -- entities of the right kind in the environment of the formal. 2288 2289 ------------------------- 2290 -- Build_Local_Package -- 2291 ------------------------- 2292 2293 function Build_Local_Package return Node_Id is 2294 Decls : List_Id; 2295 Pack_Decl : Node_Id; 2296 2297 begin 2298 -- Within the formal, the name of the generic package is a renaming 2299 -- of the formal (as for a regular instantiation). 2300 2301 Pack_Decl := 2302 Make_Package_Declaration (Loc, 2303 Specification => 2304 Copy_Generic_Node 2305 (Specification (Original_Node (Gen_Decl)), 2306 Empty, Instantiating => True)); 2307 2308 Renaming := Make_Package_Renaming_Declaration (Loc, 2309 Defining_Unit_Name => 2310 Make_Defining_Identifier (Loc, Chars (Gen_Unit)), 2311 Name => New_Occurrence_Of (Formal, Loc)); 2312 2313 if Nkind (Gen_Id) = N_Identifier 2314 and then Chars (Gen_Id) = Chars (Pack_Id) 2315 then 2316 Error_Msg_NE 2317 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit); 2318 end if; 2319 2320 -- If the formal is declared with a box, or with an others choice, 2321 -- create corresponding declarations for all entities in the formal 2322 -- part, so that names with the proper types are available in the 2323 -- specification of the formal package. 2324 2325 -- On the other hand, if there are no associations, then all the 2326 -- formals must have defaults, and this will be checked by the 2327 -- call to Analyze_Associations. 2328 2329 if Box_Present (N) 2330 or else Nkind (First (Generic_Associations (N))) = N_Others_Choice 2331 then 2332 declare 2333 Formal_Decl : Node_Id; 2334 2335 begin 2336 -- TBA : for a formal package, need to recurse ??? 2337 2338 Decls := New_List; 2339 Formal_Decl := 2340 First 2341 (Generic_Formal_Declarations (Original_Node (Gen_Decl))); 2342 while Present (Formal_Decl) loop 2343 Append_To 2344 (Decls, Copy_Generic_Node (Formal_Decl, Empty, True)); 2345 Next (Formal_Decl); 2346 end loop; 2347 end; 2348 2349 -- If generic associations are present, use Analyze_Associations to 2350 -- create the proper renaming declarations. 2351 2352 else 2353 declare 2354 Act_Tree : constant Node_Id := 2355 Copy_Generic_Node 2356 (Original_Node (Gen_Decl), Empty, 2357 Instantiating => True); 2358 2359 begin 2360 Generic_Renamings.Set_Last (0); 2361 Generic_Renamings_HTable.Reset; 2362 Instantiation_Node := N; 2363 2364 Decls := 2365 Analyze_Associations 2366 (I_Node => Original_Node (N), 2367 Formals => Generic_Formal_Declarations (Act_Tree), 2368 F_Copy => Generic_Formal_Declarations (Gen_Decl)); 2369 2370 Vis_Prims_List := Check_Hidden_Primitives (Decls); 2371 end; 2372 end if; 2373 2374 Append (Renaming, To => Decls); 2375 2376 -- Add generated declarations ahead of local declarations in 2377 -- the package. 2378 2379 if No (Visible_Declarations (Specification (Pack_Decl))) then 2380 Set_Visible_Declarations (Specification (Pack_Decl), Decls); 2381 else 2382 Insert_List_Before 2383 (First (Visible_Declarations (Specification (Pack_Decl))), 2384 Decls); 2385 end if; 2386 2387 return Pack_Decl; 2388 end Build_Local_Package; 2389 2390 -- Start of processing for Analyze_Formal_Package_Declaration 2391 2392 begin 2393 Check_Text_IO_Special_Unit (Gen_Id); 2394 2395 Init_Env; 2396 Check_Generic_Child_Unit (Gen_Id, Parent_Installed); 2397 Gen_Unit := Entity (Gen_Id); 2398 2399 -- Check for a formal package that is a package renaming 2400 2401 if Present (Renamed_Object (Gen_Unit)) then 2402 2403 -- Indicate that unit is used, before replacing it with renamed 2404 -- entity for use below. 2405 2406 if In_Extended_Main_Source_Unit (N) then 2407 Set_Is_Instantiated (Gen_Unit); 2408 Generate_Reference (Gen_Unit, N); 2409 end if; 2410 2411 Gen_Unit := Renamed_Object (Gen_Unit); 2412 end if; 2413 2414 if Ekind (Gen_Unit) /= E_Generic_Package then 2415 Error_Msg_N ("expect generic package name", Gen_Id); 2416 Restore_Env; 2417 goto Leave; 2418 2419 elsif Gen_Unit = Current_Scope then 2420 Error_Msg_N 2421 ("generic package cannot be used as a formal package of itself", 2422 Gen_Id); 2423 Restore_Env; 2424 goto Leave; 2425 2426 elsif In_Open_Scopes (Gen_Unit) then 2427 if Is_Compilation_Unit (Gen_Unit) 2428 and then Is_Child_Unit (Current_Scope) 2429 then 2430 -- Special-case the error when the formal is a parent, and 2431 -- continue analysis to minimize cascaded errors. 2432 2433 Error_Msg_N 2434 ("generic parent cannot be used as formal package " 2435 & "of a child unit", Gen_Id); 2436 2437 else 2438 Error_Msg_N 2439 ("generic package cannot be used as a formal package " 2440 & "within itself", Gen_Id); 2441 Restore_Env; 2442 goto Leave; 2443 end if; 2444 end if; 2445 2446 -- Check that name of formal package does not hide name of generic, 2447 -- or its leading prefix. This check must be done separately because 2448 -- the name of the generic has already been analyzed. 2449 2450 declare 2451 Gen_Name : Entity_Id; 2452 2453 begin 2454 Gen_Name := Gen_Id; 2455 while Nkind (Gen_Name) = N_Expanded_Name loop 2456 Gen_Name := Prefix (Gen_Name); 2457 end loop; 2458 2459 if Chars (Gen_Name) = Chars (Pack_Id) then 2460 Error_Msg_NE 2461 ("& is hidden within declaration of formal package", 2462 Gen_Id, Gen_Name); 2463 end if; 2464 end; 2465 2466 if Box_Present (N) 2467 or else No (Generic_Associations (N)) 2468 or else Nkind (First (Generic_Associations (N))) = N_Others_Choice 2469 then 2470 Associations := False; 2471 end if; 2472 2473 -- If there are no generic associations, the generic parameters appear 2474 -- as local entities and are instantiated like them. We copy the generic 2475 -- package declaration as if it were an instantiation, and analyze it 2476 -- like a regular package, except that we treat the formals as 2477 -- additional visible components. 2478 2479 Gen_Decl := Unit_Declaration_Node (Gen_Unit); 2480 2481 if In_Extended_Main_Source_Unit (N) then 2482 Set_Is_Instantiated (Gen_Unit); 2483 Generate_Reference (Gen_Unit, N); 2484 end if; 2485 2486 Formal := New_Copy (Pack_Id); 2487 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment); 2488 2489 begin 2490 -- Make local generic without formals. The formals will be replaced 2491 -- with internal declarations. 2492 2493 New_N := Build_Local_Package; 2494 2495 -- If there are errors in the parameter list, Analyze_Associations 2496 -- raises Instantiation_Error. Patch the declaration to prevent 2497 -- further exception propagation. 2498 2499 exception 2500 when Instantiation_Error => 2501 2502 Enter_Name (Formal); 2503 Set_Ekind (Formal, E_Variable); 2504 Set_Etype (Formal, Any_Type); 2505 Restore_Hidden_Primitives (Vis_Prims_List); 2506 2507 if Parent_Installed then 2508 Remove_Parent; 2509 end if; 2510 2511 goto Leave; 2512 end; 2513 2514 Rewrite (N, New_N); 2515 Set_Defining_Unit_Name (Specification (New_N), Formal); 2516 Set_Generic_Parent (Specification (N), Gen_Unit); 2517 Set_Instance_Env (Gen_Unit, Formal); 2518 Set_Is_Generic_Instance (Formal); 2519 2520 Enter_Name (Formal); 2521 Set_Ekind (Formal, E_Package); 2522 Set_Etype (Formal, Standard_Void_Type); 2523 Set_Inner_Instances (Formal, New_Elmt_List); 2524 Push_Scope (Formal); 2525 2526 if Is_Child_Unit (Gen_Unit) and then Parent_Installed then 2527 2528 -- Similarly, we have to make the name of the formal visible in the 2529 -- parent instance, to resolve properly fully qualified names that 2530 -- may appear in the generic unit. The parent instance has been 2531 -- placed on the scope stack ahead of the current scope. 2532 2533 Parent_Instance := Scope_Stack.Table (Scope_Stack.Last - 1).Entity; 2534 2535 Renaming_In_Par := 2536 Make_Defining_Identifier (Loc, Chars (Gen_Unit)); 2537 Set_Ekind (Renaming_In_Par, E_Package); 2538 Set_Etype (Renaming_In_Par, Standard_Void_Type); 2539 Set_Scope (Renaming_In_Par, Parent_Instance); 2540 Set_Parent (Renaming_In_Par, Parent (Formal)); 2541 Set_Renamed_Object (Renaming_In_Par, Formal); 2542 Append_Entity (Renaming_In_Par, Parent_Instance); 2543 end if; 2544 2545 Analyze (Specification (N)); 2546 2547 -- The formals for which associations are provided are not visible 2548 -- outside of the formal package. The others are still declared by a 2549 -- formal parameter declaration. 2550 2551 -- If there are no associations, the only local entity to hide is the 2552 -- generated package renaming itself. 2553 2554 declare 2555 E : Entity_Id; 2556 2557 begin 2558 E := First_Entity (Formal); 2559 while Present (E) loop 2560 if Associations and then not Is_Generic_Formal (E) then 2561 Set_Is_Hidden (E); 2562 end if; 2563 2564 if Ekind (E) = E_Package and then Renamed_Entity (E) = Formal then 2565 Set_Is_Hidden (E); 2566 exit; 2567 end if; 2568 2569 Next_Entity (E); 2570 end loop; 2571 end; 2572 2573 End_Package_Scope (Formal); 2574 Restore_Hidden_Primitives (Vis_Prims_List); 2575 2576 if Parent_Installed then 2577 Remove_Parent; 2578 end if; 2579 2580 Restore_Env; 2581 2582 -- Inside the generic unit, the formal package is a regular package, but 2583 -- no body is needed for it. Note that after instantiation, the defining 2584 -- unit name we need is in the new tree and not in the original (see 2585 -- Package_Instantiation). A generic formal package is an instance, and 2586 -- can be used as an actual for an inner instance. 2587 2588 Set_Has_Completion (Formal, True); 2589 2590 -- Add semantic information to the original defining identifier. 2591 -- for ASIS use. 2592 2593 Set_Ekind (Pack_Id, E_Package); 2594 Set_Etype (Pack_Id, Standard_Void_Type); 2595 Set_Scope (Pack_Id, Scope (Formal)); 2596 Set_Has_Completion (Pack_Id, True); 2597 2598 <<Leave>> 2599 if Has_Aspects (N) then 2600 Analyze_Aspect_Specifications (N, Pack_Id); 2601 end if; 2602 end Analyze_Formal_Package_Declaration; 2603 2604 --------------------------------- 2605 -- Analyze_Formal_Private_Type -- 2606 --------------------------------- 2607 2608 procedure Analyze_Formal_Private_Type 2609 (N : Node_Id; 2610 T : Entity_Id; 2611 Def : Node_Id) 2612 is 2613 begin 2614 New_Private_Type (N, T, Def); 2615 2616 -- Set the size to an arbitrary but legal value 2617 2618 Set_Size_Info (T, Standard_Integer); 2619 Set_RM_Size (T, RM_Size (Standard_Integer)); 2620 end Analyze_Formal_Private_Type; 2621 2622 ------------------------------------ 2623 -- Analyze_Formal_Incomplete_Type -- 2624 ------------------------------------ 2625 2626 procedure Analyze_Formal_Incomplete_Type 2627 (T : Entity_Id; 2628 Def : Node_Id) 2629 is 2630 begin 2631 Enter_Name (T); 2632 Set_Ekind (T, E_Incomplete_Type); 2633 Set_Etype (T, T); 2634 Set_Private_Dependents (T, New_Elmt_List); 2635 2636 if Tagged_Present (Def) then 2637 Set_Is_Tagged_Type (T); 2638 Make_Class_Wide_Type (T); 2639 Set_Direct_Primitive_Operations (T, New_Elmt_List); 2640 end if; 2641 end Analyze_Formal_Incomplete_Type; 2642 2643 ---------------------------------------- 2644 -- Analyze_Formal_Signed_Integer_Type -- 2645 ---------------------------------------- 2646 2647 procedure Analyze_Formal_Signed_Integer_Type 2648 (T : Entity_Id; 2649 Def : Node_Id) 2650 is 2651 Base : constant Entity_Id := 2652 New_Internal_Entity 2653 (E_Signed_Integer_Type, 2654 Current_Scope, 2655 Sloc (Defining_Identifier (Parent (Def))), 'G'); 2656 2657 begin 2658 Enter_Name (T); 2659 2660 Set_Ekind (T, E_Signed_Integer_Subtype); 2661 Set_Etype (T, Base); 2662 Set_Size_Info (T, Standard_Integer); 2663 Set_RM_Size (T, RM_Size (Standard_Integer)); 2664 Set_Scalar_Range (T, Scalar_Range (Standard_Integer)); 2665 Set_Is_Constrained (T); 2666 2667 Set_Is_Generic_Type (Base); 2668 Set_Size_Info (Base, Standard_Integer); 2669 Set_RM_Size (Base, RM_Size (Standard_Integer)); 2670 Set_Etype (Base, Base); 2671 Set_Scalar_Range (Base, Scalar_Range (Standard_Integer)); 2672 Set_Parent (Base, Parent (Def)); 2673 end Analyze_Formal_Signed_Integer_Type; 2674 2675 ------------------------------------------- 2676 -- Analyze_Formal_Subprogram_Declaration -- 2677 ------------------------------------------- 2678 2679 procedure Analyze_Formal_Subprogram_Declaration (N : Node_Id) is 2680 Spec : constant Node_Id := Specification (N); 2681 Def : constant Node_Id := Default_Name (N); 2682 Nam : constant Entity_Id := Defining_Unit_Name (Spec); 2683 Subp : Entity_Id; 2684 2685 begin 2686 if Nam = Error then 2687 return; 2688 end if; 2689 2690 if Nkind (Nam) = N_Defining_Program_Unit_Name then 2691 Error_Msg_N ("name of formal subprogram must be a direct name", Nam); 2692 goto Leave; 2693 end if; 2694 2695 Analyze_Subprogram_Declaration (N); 2696 Set_Is_Formal_Subprogram (Nam); 2697 Set_Has_Completion (Nam); 2698 2699 if Nkind (N) = N_Formal_Abstract_Subprogram_Declaration then 2700 Set_Is_Abstract_Subprogram (Nam); 2701 Set_Is_Dispatching_Operation (Nam); 2702 2703 declare 2704 Ctrl_Type : constant Entity_Id := Find_Dispatching_Type (Nam); 2705 begin 2706 if No (Ctrl_Type) then 2707 Error_Msg_N 2708 ("abstract formal subprogram must have a controlling type", 2709 N); 2710 2711 elsif Ada_Version >= Ada_2012 2712 and then Is_Incomplete_Type (Ctrl_Type) 2713 then 2714 Error_Msg_NE 2715 ("controlling type of abstract formal subprogram cannot " 2716 & "be incomplete type", N, Ctrl_Type); 2717 2718 else 2719 Check_Controlling_Formals (Ctrl_Type, Nam); 2720 end if; 2721 end; 2722 end if; 2723 2724 -- Default name is resolved at the point of instantiation 2725 2726 if Box_Present (N) then 2727 null; 2728 2729 -- Else default is bound at the point of generic declaration 2730 2731 elsif Present (Def) then 2732 if Nkind (Def) = N_Operator_Symbol then 2733 Find_Direct_Name (Def); 2734 2735 elsif Nkind (Def) /= N_Attribute_Reference then 2736 Analyze (Def); 2737 2738 else 2739 -- For an attribute reference, analyze the prefix and verify 2740 -- that it has the proper profile for the subprogram. 2741 2742 Analyze (Prefix (Def)); 2743 Valid_Default_Attribute (Nam, Def); 2744 goto Leave; 2745 end if; 2746 2747 -- Default name may be overloaded, in which case the interpretation 2748 -- with the correct profile must be selected, as for a renaming. 2749 -- If the definition is an indexed component, it must denote a 2750 -- member of an entry family. If it is a selected component, it 2751 -- can be a protected operation. 2752 2753 if Etype (Def) = Any_Type then 2754 goto Leave; 2755 2756 elsif Nkind (Def) = N_Selected_Component then 2757 if not Is_Overloadable (Entity (Selector_Name (Def))) then 2758 Error_Msg_N ("expect valid subprogram name as default", Def); 2759 end if; 2760 2761 elsif Nkind (Def) = N_Indexed_Component then 2762 if Is_Entity_Name (Prefix (Def)) then 2763 if Ekind (Entity (Prefix (Def))) /= E_Entry_Family then 2764 Error_Msg_N ("expect valid subprogram name as default", Def); 2765 end if; 2766 2767 elsif Nkind (Prefix (Def)) = N_Selected_Component then 2768 if Ekind (Entity (Selector_Name (Prefix (Def)))) /= 2769 E_Entry_Family 2770 then 2771 Error_Msg_N ("expect valid subprogram name as default", Def); 2772 end if; 2773 2774 else 2775 Error_Msg_N ("expect valid subprogram name as default", Def); 2776 goto Leave; 2777 end if; 2778 2779 elsif Nkind (Def) = N_Character_Literal then 2780 2781 -- Needs some type checks: subprogram should be parameterless??? 2782 2783 Resolve (Def, (Etype (Nam))); 2784 2785 elsif not Is_Entity_Name (Def) 2786 or else not Is_Overloadable (Entity (Def)) 2787 then 2788 Error_Msg_N ("expect valid subprogram name as default", Def); 2789 goto Leave; 2790 2791 elsif not Is_Overloaded (Def) then 2792 Subp := Entity (Def); 2793 2794 if Subp = Nam then 2795 Error_Msg_N ("premature usage of formal subprogram", Def); 2796 2797 elsif not Entity_Matches_Spec (Subp, Nam) then 2798 Error_Msg_N ("no visible entity matches specification", Def); 2799 end if; 2800 2801 -- More than one interpretation, so disambiguate as for a renaming 2802 2803 else 2804 declare 2805 I : Interp_Index; 2806 I1 : Interp_Index := 0; 2807 It : Interp; 2808 It1 : Interp; 2809 2810 begin 2811 Subp := Any_Id; 2812 Get_First_Interp (Def, I, It); 2813 while Present (It.Nam) loop 2814 if Entity_Matches_Spec (It.Nam, Nam) then 2815 if Subp /= Any_Id then 2816 It1 := Disambiguate (Def, I1, I, Etype (Subp)); 2817 2818 if It1 = No_Interp then 2819 Error_Msg_N ("ambiguous default subprogram", Def); 2820 else 2821 Subp := It1.Nam; 2822 end if; 2823 2824 exit; 2825 2826 else 2827 I1 := I; 2828 Subp := It.Nam; 2829 end if; 2830 end if; 2831 2832 Get_Next_Interp (I, It); 2833 end loop; 2834 end; 2835 2836 if Subp /= Any_Id then 2837 2838 -- Subprogram found, generate reference to it 2839 2840 Set_Entity (Def, Subp); 2841 Generate_Reference (Subp, Def); 2842 2843 if Subp = Nam then 2844 Error_Msg_N ("premature usage of formal subprogram", Def); 2845 2846 elsif Ekind (Subp) /= E_Operator then 2847 Check_Mode_Conformant (Subp, Nam); 2848 end if; 2849 2850 else 2851 Error_Msg_N ("no visible subprogram matches specification", N); 2852 end if; 2853 end if; 2854 end if; 2855 2856 <<Leave>> 2857 if Has_Aspects (N) then 2858 Analyze_Aspect_Specifications (N, Nam); 2859 end if; 2860 2861 end Analyze_Formal_Subprogram_Declaration; 2862 2863 ------------------------------------- 2864 -- Analyze_Formal_Type_Declaration -- 2865 ------------------------------------- 2866 2867 procedure Analyze_Formal_Type_Declaration (N : Node_Id) is 2868 Def : constant Node_Id := Formal_Type_Definition (N); 2869 T : Entity_Id; 2870 2871 begin 2872 T := Defining_Identifier (N); 2873 2874 if Present (Discriminant_Specifications (N)) 2875 and then Nkind (Def) /= N_Formal_Private_Type_Definition 2876 then 2877 Error_Msg_N 2878 ("discriminants not allowed for this formal type", T); 2879 end if; 2880 2881 -- Enter the new name, and branch to specific routine 2882 2883 case Nkind (Def) is 2884 when N_Formal_Private_Type_Definition => 2885 Analyze_Formal_Private_Type (N, T, Def); 2886 2887 when N_Formal_Derived_Type_Definition => 2888 Analyze_Formal_Derived_Type (N, T, Def); 2889 2890 when N_Formal_Incomplete_Type_Definition => 2891 Analyze_Formal_Incomplete_Type (T, Def); 2892 2893 when N_Formal_Discrete_Type_Definition => 2894 Analyze_Formal_Discrete_Type (T, Def); 2895 2896 when N_Formal_Signed_Integer_Type_Definition => 2897 Analyze_Formal_Signed_Integer_Type (T, Def); 2898 2899 when N_Formal_Modular_Type_Definition => 2900 Analyze_Formal_Modular_Type (T, Def); 2901 2902 when N_Formal_Floating_Point_Definition => 2903 Analyze_Formal_Floating_Type (T, Def); 2904 2905 when N_Formal_Ordinary_Fixed_Point_Definition => 2906 Analyze_Formal_Ordinary_Fixed_Point_Type (T, Def); 2907 2908 when N_Formal_Decimal_Fixed_Point_Definition => 2909 Analyze_Formal_Decimal_Fixed_Point_Type (T, Def); 2910 2911 when N_Array_Type_Definition => 2912 Analyze_Formal_Array_Type (T, Def); 2913 2914 when N_Access_To_Object_Definition | 2915 N_Access_Function_Definition | 2916 N_Access_Procedure_Definition => 2917 Analyze_Generic_Access_Type (T, Def); 2918 2919 -- Ada 2005: a interface declaration is encoded as an abstract 2920 -- record declaration or a abstract type derivation. 2921 2922 when N_Record_Definition => 2923 Analyze_Formal_Interface_Type (N, T, Def); 2924 2925 when N_Derived_Type_Definition => 2926 Analyze_Formal_Derived_Interface_Type (N, T, Def); 2927 2928 when N_Error => 2929 null; 2930 2931 when others => 2932 raise Program_Error; 2933 2934 end case; 2935 2936 Set_Is_Generic_Type (T); 2937 2938 if Has_Aspects (N) then 2939 Analyze_Aspect_Specifications (N, T); 2940 end if; 2941 end Analyze_Formal_Type_Declaration; 2942 2943 ------------------------------------ 2944 -- Analyze_Function_Instantiation -- 2945 ------------------------------------ 2946 2947 procedure Analyze_Function_Instantiation (N : Node_Id) is 2948 begin 2949 Analyze_Subprogram_Instantiation (N, E_Function); 2950 end Analyze_Function_Instantiation; 2951 2952 --------------------------------- 2953 -- Analyze_Generic_Access_Type -- 2954 --------------------------------- 2955 2956 procedure Analyze_Generic_Access_Type (T : Entity_Id; Def : Node_Id) is 2957 begin 2958 Enter_Name (T); 2959 2960 if Nkind (Def) = N_Access_To_Object_Definition then 2961 Access_Type_Declaration (T, Def); 2962 2963 if Is_Incomplete_Or_Private_Type (Designated_Type (T)) 2964 and then No (Full_View (Designated_Type (T))) 2965 and then not Is_Generic_Type (Designated_Type (T)) 2966 then 2967 Error_Msg_N ("premature usage of incomplete type", Def); 2968 2969 elsif not Is_Entity_Name (Subtype_Indication (Def)) then 2970 Error_Msg_N 2971 ("only a subtype mark is allowed in a formal", Def); 2972 end if; 2973 2974 else 2975 Access_Subprogram_Declaration (T, Def); 2976 end if; 2977 end Analyze_Generic_Access_Type; 2978 2979 --------------------------------- 2980 -- Analyze_Generic_Formal_Part -- 2981 --------------------------------- 2982 2983 procedure Analyze_Generic_Formal_Part (N : Node_Id) is 2984 Gen_Parm_Decl : Node_Id; 2985 2986 begin 2987 -- The generic formals are processed in the scope of the generic unit, 2988 -- where they are immediately visible. The scope is installed by the 2989 -- caller. 2990 2991 Gen_Parm_Decl := First (Generic_Formal_Declarations (N)); 2992 while Present (Gen_Parm_Decl) loop 2993 Analyze (Gen_Parm_Decl); 2994 Next (Gen_Parm_Decl); 2995 end loop; 2996 2997 Generate_Reference_To_Generic_Formals (Current_Scope); 2998 end Analyze_Generic_Formal_Part; 2999 3000 ------------------------------------------ 3001 -- Analyze_Generic_Package_Declaration -- 3002 ------------------------------------------ 3003 3004 procedure Analyze_Generic_Package_Declaration (N : Node_Id) is 3005 Loc : constant Source_Ptr := Sloc (N); 3006 Id : Entity_Id; 3007 New_N : Node_Id; 3008 Save_Parent : Node_Id; 3009 Renaming : Node_Id; 3010 Decls : constant List_Id := 3011 Visible_Declarations (Specification (N)); 3012 Decl : Node_Id; 3013 3014 begin 3015 -- The generic package declaration may be subject to pragma Ghost with 3016 -- policy Ignore. Set the mode now to ensure that any nodes generated 3017 -- during analysis and expansion are properly flagged as ignored Ghost. 3018 3019 Set_Ghost_Mode (N); 3020 Check_SPARK_05_Restriction ("generic is not allowed", N); 3021 3022 -- We introduce a renaming of the enclosing package, to have a usable 3023 -- entity as the prefix of an expanded name for a local entity of the 3024 -- form Par.P.Q, where P is the generic package. This is because a local 3025 -- entity named P may hide it, so that the usual visibility rules in 3026 -- the instance will not resolve properly. 3027 3028 Renaming := 3029 Make_Package_Renaming_Declaration (Loc, 3030 Defining_Unit_Name => 3031 Make_Defining_Identifier (Loc, 3032 Chars => New_External_Name (Chars (Defining_Entity (N)), "GH")), 3033 Name => 3034 Make_Identifier (Loc, Chars (Defining_Entity (N)))); 3035 3036 if Present (Decls) then 3037 Decl := First (Decls); 3038 while Present (Decl) and then Nkind (Decl) = N_Pragma loop 3039 Next (Decl); 3040 end loop; 3041 3042 if Present (Decl) then 3043 Insert_Before (Decl, Renaming); 3044 else 3045 Append (Renaming, Visible_Declarations (Specification (N))); 3046 end if; 3047 3048 else 3049 Set_Visible_Declarations (Specification (N), New_List (Renaming)); 3050 end if; 3051 3052 -- Create copy of generic unit, and save for instantiation. If the unit 3053 -- is a child unit, do not copy the specifications for the parent, which 3054 -- are not part of the generic tree. 3055 3056 Save_Parent := Parent_Spec (N); 3057 Set_Parent_Spec (N, Empty); 3058 3059 New_N := Copy_Generic_Node (N, Empty, Instantiating => False); 3060 Set_Parent_Spec (New_N, Save_Parent); 3061 Rewrite (N, New_N); 3062 3063 -- Once the contents of the generic copy and the template are swapped, 3064 -- do the same for their respective aspect specifications. 3065 3066 Exchange_Aspects (N, New_N); 3067 Id := Defining_Entity (N); 3068 Generate_Definition (Id); 3069 3070 -- Expansion is not applied to generic units 3071 3072 Start_Generic; 3073 3074 Enter_Name (Id); 3075 Set_Ekind (Id, E_Generic_Package); 3076 Set_Etype (Id, Standard_Void_Type); 3077 3078 -- A generic package declared within a Ghost region is rendered Ghost 3079 -- (SPARK RM 6.9(2)). 3080 3081 if Ghost_Mode > None then 3082 Set_Is_Ghost_Entity (Id); 3083 end if; 3084 3085 -- Analyze aspects now, so that generated pragmas appear in the 3086 -- declarations before building and analyzing the generic copy. 3087 3088 if Has_Aspects (N) then 3089 Analyze_Aspect_Specifications (N, Id); 3090 end if; 3091 3092 Push_Scope (Id); 3093 Enter_Generic_Scope (Id); 3094 Set_Inner_Instances (Id, New_Elmt_List); 3095 3096 Set_Categorization_From_Pragmas (N); 3097 Set_Is_Pure (Id, Is_Pure (Current_Scope)); 3098 3099 -- Link the declaration of the generic homonym in the generic copy to 3100 -- the package it renames, so that it is always resolved properly. 3101 3102 Set_Generic_Homonym (Id, Defining_Unit_Name (Renaming)); 3103 Set_Entity (Associated_Node (Name (Renaming)), Id); 3104 3105 -- For a library unit, we have reconstructed the entity for the unit, 3106 -- and must reset it in the library tables. 3107 3108 if Nkind (Parent (N)) = N_Compilation_Unit then 3109 Set_Cunit_Entity (Current_Sem_Unit, Id); 3110 end if; 3111 3112 Analyze_Generic_Formal_Part (N); 3113 3114 -- After processing the generic formals, analysis proceeds as for a 3115 -- non-generic package. 3116 3117 Analyze (Specification (N)); 3118 3119 Validate_Categorization_Dependency (N, Id); 3120 3121 End_Generic; 3122 3123 End_Package_Scope (Id); 3124 Exit_Generic_Scope (Id); 3125 3126 if Nkind (Parent (N)) /= N_Compilation_Unit then 3127 Move_Freeze_Nodes (Id, N, Visible_Declarations (Specification (N))); 3128 Move_Freeze_Nodes (Id, N, Private_Declarations (Specification (N))); 3129 Move_Freeze_Nodes (Id, N, Generic_Formal_Declarations (N)); 3130 3131 else 3132 Set_Body_Required (Parent (N), Unit_Requires_Body (Id)); 3133 Validate_RT_RAT_Component (N); 3134 3135 -- If this is a spec without a body, check that generic parameters 3136 -- are referenced. 3137 3138 if not Body_Required (Parent (N)) then 3139 Check_References (Id); 3140 end if; 3141 end if; 3142 3143 -- If there is a specified storage pool in the context, create an 3144 -- aspect on the package declaration, so that it is used in any 3145 -- instance that does not override it. 3146 3147 if Present (Default_Pool) then 3148 declare 3149 ASN : Node_Id; 3150 3151 begin 3152 ASN := 3153 Make_Aspect_Specification (Loc, 3154 Identifier => Make_Identifier (Loc, Name_Default_Storage_Pool), 3155 Expression => New_Copy (Default_Pool)); 3156 3157 if No (Aspect_Specifications (Specification (N))) then 3158 Set_Aspect_Specifications (Specification (N), New_List (ASN)); 3159 else 3160 Append (ASN, Aspect_Specifications (Specification (N))); 3161 end if; 3162 end; 3163 end if; 3164 end Analyze_Generic_Package_Declaration; 3165 3166 -------------------------------------------- 3167 -- Analyze_Generic_Subprogram_Declaration -- 3168 -------------------------------------------- 3169 3170 procedure Analyze_Generic_Subprogram_Declaration (N : Node_Id) is 3171 Formals : List_Id; 3172 Id : Entity_Id; 3173 New_N : Node_Id; 3174 Result_Type : Entity_Id; 3175 Save_Parent : Node_Id; 3176 Spec : Node_Id; 3177 Typ : Entity_Id; 3178 3179 begin 3180 -- The generic subprogram declaration may be subject to pragma Ghost 3181 -- with policy Ignore. Set the mode now to ensure that any nodes 3182 -- generated during analysis and expansion are properly flagged as 3183 -- ignored Ghost. 3184 3185 Set_Ghost_Mode (N); 3186 Check_SPARK_05_Restriction ("generic is not allowed", N); 3187 3188 -- Create copy of generic unit, and save for instantiation. If the unit 3189 -- is a child unit, do not copy the specifications for the parent, which 3190 -- are not part of the generic tree. 3191 3192 Save_Parent := Parent_Spec (N); 3193 Set_Parent_Spec (N, Empty); 3194 3195 New_N := Copy_Generic_Node (N, Empty, Instantiating => False); 3196 Set_Parent_Spec (New_N, Save_Parent); 3197 Rewrite (N, New_N); 3198 3199 -- Once the contents of the generic copy and the template are swapped, 3200 -- do the same for their respective aspect specifications. 3201 3202 Exchange_Aspects (N, New_N); 3203 3204 Spec := Specification (N); 3205 Id := Defining_Entity (Spec); 3206 Generate_Definition (Id); 3207 3208 if Nkind (Id) = N_Defining_Operator_Symbol then 3209 Error_Msg_N 3210 ("operator symbol not allowed for generic subprogram", Id); 3211 end if; 3212 3213 Start_Generic; 3214 3215 Enter_Name (Id); 3216 Set_Scope_Depth_Value (Id, Scope_Depth (Current_Scope) + 1); 3217 3218 -- Analyze the aspects of the generic copy to ensure that all generated 3219 -- pragmas (if any) perform their semantic effects. 3220 3221 if Has_Aspects (N) then 3222 Analyze_Aspect_Specifications (N, Id); 3223 end if; 3224 3225 Push_Scope (Id); 3226 Enter_Generic_Scope (Id); 3227 Set_Inner_Instances (Id, New_Elmt_List); 3228 Set_Is_Pure (Id, Is_Pure (Current_Scope)); 3229 3230 Analyze_Generic_Formal_Part (N); 3231 3232 Formals := Parameter_Specifications (Spec); 3233 3234 if Present (Formals) then 3235 Process_Formals (Formals, Spec); 3236 end if; 3237 3238 if Nkind (Spec) = N_Function_Specification then 3239 Set_Ekind (Id, E_Generic_Function); 3240 3241 if Nkind (Result_Definition (Spec)) = N_Access_Definition then 3242 Result_Type := Access_Definition (Spec, Result_Definition (Spec)); 3243 Set_Etype (Id, Result_Type); 3244 3245 -- Check restriction imposed by AI05-073: a generic function 3246 -- cannot return an abstract type or an access to such. 3247 3248 -- This is a binding interpretation should it apply to earlier 3249 -- versions of Ada as well as Ada 2012??? 3250 3251 if Is_Abstract_Type (Designated_Type (Result_Type)) 3252 and then Ada_Version >= Ada_2012 3253 then 3254 Error_Msg_N 3255 ("generic function cannot have an access result " 3256 & "that designates an abstract type", Spec); 3257 end if; 3258 3259 else 3260 Find_Type (Result_Definition (Spec)); 3261 Typ := Entity (Result_Definition (Spec)); 3262 3263 if Is_Abstract_Type (Typ) 3264 and then Ada_Version >= Ada_2012 3265 then 3266 Error_Msg_N 3267 ("generic function cannot have abstract result type", Spec); 3268 end if; 3269 3270 -- If a null exclusion is imposed on the result type, then create 3271 -- a null-excluding itype (an access subtype) and use it as the 3272 -- function's Etype. 3273 3274 if Is_Access_Type (Typ) 3275 and then Null_Exclusion_Present (Spec) 3276 then 3277 Set_Etype (Id, 3278 Create_Null_Excluding_Itype 3279 (T => Typ, 3280 Related_Nod => Spec, 3281 Scope_Id => Defining_Unit_Name (Spec))); 3282 else 3283 Set_Etype (Id, Typ); 3284 end if; 3285 end if; 3286 3287 else 3288 Set_Ekind (Id, E_Generic_Procedure); 3289 Set_Etype (Id, Standard_Void_Type); 3290 end if; 3291 3292 -- A generic subprogram declared within a Ghost region is rendered Ghost 3293 -- (SPARK RM 6.9(2)). 3294 3295 if Ghost_Mode > None then 3296 Set_Is_Ghost_Entity (Id); 3297 end if; 3298 3299 -- For a library unit, we have reconstructed the entity for the unit, 3300 -- and must reset it in the library tables. We also make sure that 3301 -- Body_Required is set properly in the original compilation unit node. 3302 3303 if Nkind (Parent (N)) = N_Compilation_Unit then 3304 Set_Cunit_Entity (Current_Sem_Unit, Id); 3305 Set_Body_Required (Parent (N), Unit_Requires_Body (Id)); 3306 end if; 3307 3308 Set_Categorization_From_Pragmas (N); 3309 Validate_Categorization_Dependency (N, Id); 3310 3311 -- Capture all global references that occur within the profile of the 3312 -- generic subprogram. Aspects are not part of this processing because 3313 -- they must be delayed. If processed now, Save_Global_References will 3314 -- destroy the Associated_Node links and prevent the capture of global 3315 -- references when the contract of the generic subprogram is analyzed. 3316 3317 Save_Global_References (Original_Node (N)); 3318 3319 End_Generic; 3320 End_Scope; 3321 Exit_Generic_Scope (Id); 3322 Generate_Reference_To_Formals (Id); 3323 3324 List_Inherited_Pre_Post_Aspects (Id); 3325 end Analyze_Generic_Subprogram_Declaration; 3326 3327 ----------------------------------- 3328 -- Analyze_Package_Instantiation -- 3329 ----------------------------------- 3330 3331 procedure Analyze_Package_Instantiation (N : Node_Id) is 3332 Loc : constant Source_Ptr := Sloc (N); 3333 Gen_Id : constant Node_Id := Name (N); 3334 3335 Act_Decl : Node_Id; 3336 Act_Decl_Name : Node_Id; 3337 Act_Decl_Id : Entity_Id; 3338 Act_Spec : Node_Id; 3339 Act_Tree : Node_Id; 3340 3341 Gen_Decl : Node_Id; 3342 Gen_Spec : Node_Id; 3343 Gen_Unit : Entity_Id; 3344 3345 Is_Actual_Pack : constant Boolean := 3346 Is_Internal (Defining_Entity (N)); 3347 3348 Env_Installed : Boolean := False; 3349 Parent_Installed : Boolean := False; 3350 Renaming_List : List_Id; 3351 Unit_Renaming : Node_Id; 3352 Needs_Body : Boolean; 3353 Inline_Now : Boolean := False; 3354 Has_Inline_Always : Boolean := False; 3355 3356 Save_IPSM : constant Boolean := Ignore_Pragma_SPARK_Mode; 3357 -- Save flag Ignore_Pragma_SPARK_Mode for restore on exit 3358 3359 Save_SM : constant SPARK_Mode_Type := SPARK_Mode; 3360 Save_SMP : constant Node_Id := SPARK_Mode_Pragma; 3361 -- Save the SPARK_Mode-related data for restore on exit 3362 3363 Save_Style_Check : constant Boolean := Style_Check; 3364 -- Save style check mode for restore on exit 3365 3366 procedure Delay_Descriptors (E : Entity_Id); 3367 -- Delay generation of subprogram descriptors for given entity 3368 3369 function Might_Inline_Subp return Boolean; 3370 -- If inlining is active and the generic contains inlined subprograms, 3371 -- we instantiate the body. This may cause superfluous instantiations, 3372 -- but it is simpler than detecting the need for the body at the point 3373 -- of inlining, when the context of the instance is not available. 3374 3375 ----------------------- 3376 -- Delay_Descriptors -- 3377 ----------------------- 3378 3379 procedure Delay_Descriptors (E : Entity_Id) is 3380 begin 3381 if not Delay_Subprogram_Descriptors (E) then 3382 Set_Delay_Subprogram_Descriptors (E); 3383 Pending_Descriptor.Append (E); 3384 end if; 3385 end Delay_Descriptors; 3386 3387 ----------------------- 3388 -- Might_Inline_Subp -- 3389 ----------------------- 3390 3391 function Might_Inline_Subp return Boolean is 3392 E : Entity_Id; 3393 3394 begin 3395 if not Inline_Processing_Required then 3396 return False; 3397 3398 else 3399 E := First_Entity (Gen_Unit); 3400 while Present (E) loop 3401 if Is_Subprogram (E) and then Is_Inlined (E) then 3402 -- Remember if there are any subprograms with Inline_Always 3403 3404 if Has_Pragma_Inline_Always (E) then 3405 Has_Inline_Always := True; 3406 end if; 3407 3408 return True; 3409 end if; 3410 3411 Next_Entity (E); 3412 end loop; 3413 end if; 3414 3415 return False; 3416 end Might_Inline_Subp; 3417 3418 -- Local declarations 3419 3420 Vis_Prims_List : Elist_Id := No_Elist; 3421 -- List of primitives made temporarily visible in the instantiation 3422 -- to match the visibility of the formal type 3423 3424 -- Start of processing for Analyze_Package_Instantiation 3425 3426 begin 3427 Check_SPARK_05_Restriction ("generic is not allowed", N); 3428 3429 -- Very first thing: check for Text_IO sp[ecial unit in case we are 3430 -- instantiating one of the children of [[Wide_]Wide_]Text_IO. 3431 3432 Check_Text_IO_Special_Unit (Name (N)); 3433 3434 -- Make node global for error reporting 3435 3436 Instantiation_Node := N; 3437 3438 -- Turn off style checking in instances. If the check is enabled on the 3439 -- generic unit, a warning in an instance would just be noise. If not 3440 -- enabled on the generic, then a warning in an instance is just wrong. 3441 3442 Style_Check := False; 3443 3444 -- Case of instantiation of a generic package 3445 3446 if Nkind (N) = N_Package_Instantiation then 3447 Act_Decl_Id := New_Copy (Defining_Entity (N)); 3448 Set_Comes_From_Source (Act_Decl_Id, True); 3449 3450 if Nkind (Defining_Unit_Name (N)) = N_Defining_Program_Unit_Name then 3451 Act_Decl_Name := 3452 Make_Defining_Program_Unit_Name (Loc, 3453 Name => 3454 New_Copy_Tree (Name (Defining_Unit_Name (N))), 3455 Defining_Identifier => Act_Decl_Id); 3456 else 3457 Act_Decl_Name := Act_Decl_Id; 3458 end if; 3459 3460 -- Case of instantiation of a formal package 3461 3462 else 3463 Act_Decl_Id := Defining_Identifier (N); 3464 Act_Decl_Name := Act_Decl_Id; 3465 end if; 3466 3467 Generate_Definition (Act_Decl_Id); 3468 Preanalyze_Actuals (N); 3469 3470 Init_Env; 3471 Env_Installed := True; 3472 3473 -- Reset renaming map for formal types. The mapping is established 3474 -- when analyzing the generic associations, but some mappings are 3475 -- inherited from formal packages of parent units, and these are 3476 -- constructed when the parents are installed. 3477 3478 Generic_Renamings.Set_Last (0); 3479 Generic_Renamings_HTable.Reset; 3480 3481 Check_Generic_Child_Unit (Gen_Id, Parent_Installed); 3482 Gen_Unit := Entity (Gen_Id); 3483 3484 -- Verify that it is the name of a generic package 3485 3486 -- A visibility glitch: if the instance is a child unit and the generic 3487 -- is the generic unit of a parent instance (i.e. both the parent and 3488 -- the child units are instances of the same package) the name now 3489 -- denotes the renaming within the parent, not the intended generic 3490 -- unit. See if there is a homonym that is the desired generic. The 3491 -- renaming declaration must be visible inside the instance of the 3492 -- child, but not when analyzing the name in the instantiation itself. 3493 3494 if Ekind (Gen_Unit) = E_Package 3495 and then Present (Renamed_Entity (Gen_Unit)) 3496 and then In_Open_Scopes (Renamed_Entity (Gen_Unit)) 3497 and then Is_Generic_Instance (Renamed_Entity (Gen_Unit)) 3498 and then Present (Homonym (Gen_Unit)) 3499 then 3500 Gen_Unit := Homonym (Gen_Unit); 3501 end if; 3502 3503 if Etype (Gen_Unit) = Any_Type then 3504 Restore_Env; 3505 goto Leave; 3506 3507 elsif Ekind (Gen_Unit) /= E_Generic_Package then 3508 3509 -- Ada 2005 (AI-50217): Cannot use instance in limited with_clause 3510 3511 if From_Limited_With (Gen_Unit) then 3512 Error_Msg_N 3513 ("cannot instantiate a limited withed package", Gen_Id); 3514 else 3515 Error_Msg_NE 3516 ("& is not the name of a generic package", Gen_Id, Gen_Unit); 3517 end if; 3518 3519 Restore_Env; 3520 goto Leave; 3521 end if; 3522 3523 if In_Extended_Main_Source_Unit (N) then 3524 Set_Is_Instantiated (Gen_Unit); 3525 Generate_Reference (Gen_Unit, N); 3526 3527 if Present (Renamed_Object (Gen_Unit)) then 3528 Set_Is_Instantiated (Renamed_Object (Gen_Unit)); 3529 Generate_Reference (Renamed_Object (Gen_Unit), N); 3530 end if; 3531 end if; 3532 3533 if Nkind (Gen_Id) = N_Identifier 3534 and then Chars (Gen_Unit) = Chars (Defining_Entity (N)) 3535 then 3536 Error_Msg_NE 3537 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit); 3538 3539 elsif Nkind (Gen_Id) = N_Expanded_Name 3540 and then Is_Child_Unit (Gen_Unit) 3541 and then Nkind (Prefix (Gen_Id)) = N_Identifier 3542 and then Chars (Act_Decl_Id) = Chars (Prefix (Gen_Id)) 3543 then 3544 Error_Msg_N 3545 ("& is hidden within declaration of instance ", Prefix (Gen_Id)); 3546 end if; 3547 3548 Set_Entity (Gen_Id, Gen_Unit); 3549 3550 -- If generic is a renaming, get original generic unit 3551 3552 if Present (Renamed_Object (Gen_Unit)) 3553 and then Ekind (Renamed_Object (Gen_Unit)) = E_Generic_Package 3554 then 3555 Gen_Unit := Renamed_Object (Gen_Unit); 3556 end if; 3557 3558 -- Verify that there are no circular instantiations 3559 3560 if In_Open_Scopes (Gen_Unit) then 3561 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit); 3562 Restore_Env; 3563 goto Leave; 3564 3565 elsif Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then 3566 Error_Msg_Node_2 := Current_Scope; 3567 Error_Msg_NE 3568 ("circular Instantiation: & instantiated in &!", N, Gen_Unit); 3569 Circularity_Detected := True; 3570 Restore_Env; 3571 goto Leave; 3572 3573 else 3574 -- If the context of the instance is subject to SPARK_Mode "off", 3575 -- set the global flag which signals Analyze_Pragma to ignore all 3576 -- SPARK_Mode pragmas within the instance. 3577 3578 if SPARK_Mode = Off then 3579 Ignore_Pragma_SPARK_Mode := True; 3580 end if; 3581 3582 Gen_Decl := Unit_Declaration_Node (Gen_Unit); 3583 Gen_Spec := Specification (Gen_Decl); 3584 3585 -- Initialize renamings map, for error checking, and the list that 3586 -- holds private entities whose views have changed between generic 3587 -- definition and instantiation. If this is the instance created to 3588 -- validate an actual package, the instantiation environment is that 3589 -- of the enclosing instance. 3590 3591 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment); 3592 3593 -- Copy original generic tree, to produce text for instantiation 3594 3595 Act_Tree := 3596 Copy_Generic_Node 3597 (Original_Node (Gen_Decl), Empty, Instantiating => True); 3598 3599 Act_Spec := Specification (Act_Tree); 3600 3601 -- If this is the instance created to validate an actual package, 3602 -- only the formals matter, do not examine the package spec itself. 3603 3604 if Is_Actual_Pack then 3605 Set_Visible_Declarations (Act_Spec, New_List); 3606 Set_Private_Declarations (Act_Spec, New_List); 3607 end if; 3608 3609 Renaming_List := 3610 Analyze_Associations 3611 (I_Node => N, 3612 Formals => Generic_Formal_Declarations (Act_Tree), 3613 F_Copy => Generic_Formal_Declarations (Gen_Decl)); 3614 3615 Vis_Prims_List := Check_Hidden_Primitives (Renaming_List); 3616 3617 Set_Instance_Env (Gen_Unit, Act_Decl_Id); 3618 Set_Defining_Unit_Name (Act_Spec, Act_Decl_Name); 3619 Set_Is_Generic_Instance (Act_Decl_Id); 3620 Set_Generic_Parent (Act_Spec, Gen_Unit); 3621 3622 -- References to the generic in its own declaration or its body are 3623 -- references to the instance. Add a renaming declaration for the 3624 -- generic unit itself. This declaration, as well as the renaming 3625 -- declarations for the generic formals, must remain private to the 3626 -- unit: the formals, because this is the language semantics, and 3627 -- the unit because its use is an artifact of the implementation. 3628 3629 Unit_Renaming := 3630 Make_Package_Renaming_Declaration (Loc, 3631 Defining_Unit_Name => 3632 Make_Defining_Identifier (Loc, Chars (Gen_Unit)), 3633 Name => New_Occurrence_Of (Act_Decl_Id, Loc)); 3634 3635 Append (Unit_Renaming, Renaming_List); 3636 3637 -- The renaming declarations are the first local declarations of the 3638 -- new unit. 3639 3640 if Is_Non_Empty_List (Visible_Declarations (Act_Spec)) then 3641 Insert_List_Before 3642 (First (Visible_Declarations (Act_Spec)), Renaming_List); 3643 else 3644 Set_Visible_Declarations (Act_Spec, Renaming_List); 3645 end if; 3646 3647 Act_Decl := Make_Package_Declaration (Loc, Specification => Act_Spec); 3648 3649 -- Propagate the aspect specifications from the package declaration 3650 -- template to the instantiated version of the package declaration. 3651 3652 if Has_Aspects (Act_Tree) then 3653 Set_Aspect_Specifications (Act_Decl, 3654 New_Copy_List_Tree (Aspect_Specifications (Act_Tree))); 3655 end if; 3656 3657 -- The generic may have a generated Default_Storage_Pool aspect, 3658 -- set at the point of generic declaration. If the instance has 3659 -- that aspect, it overrides the one inherited from the generic. 3660 3661 if Has_Aspects (Gen_Spec) then 3662 if No (Aspect_Specifications (N)) then 3663 Set_Aspect_Specifications (N, 3664 (New_Copy_List_Tree 3665 (Aspect_Specifications (Gen_Spec)))); 3666 3667 else 3668 declare 3669 ASN1, ASN2 : Node_Id; 3670 3671 begin 3672 ASN1 := First (Aspect_Specifications (N)); 3673 while Present (ASN1) loop 3674 if Chars (Identifier (ASN1)) = Name_Default_Storage_Pool 3675 then 3676 -- If generic carries a default storage pool, remove 3677 -- it in favor of the instance one. 3678 3679 ASN2 := First (Aspect_Specifications (Gen_Spec)); 3680 while Present (ASN2) loop 3681 if Chars (Identifier (ASN2)) = 3682 Name_Default_Storage_Pool 3683 then 3684 Remove (ASN2); 3685 exit; 3686 end if; 3687 3688 Next (ASN2); 3689 end loop; 3690 end if; 3691 3692 Next (ASN1); 3693 end loop; 3694 3695 Prepend_List_To (Aspect_Specifications (N), 3696 (New_Copy_List_Tree 3697 (Aspect_Specifications (Gen_Spec)))); 3698 end; 3699 end if; 3700 end if; 3701 3702 -- Save the instantiation node, for subsequent instantiation of the 3703 -- body, if there is one and we are generating code for the current 3704 -- unit. Mark unit as having a body (avoids premature error message). 3705 3706 -- We instantiate the body if we are generating code, if we are 3707 -- generating cross-reference information, or if we are building 3708 -- trees for ASIS use or GNATprove use. 3709 3710 declare 3711 Enclosing_Body_Present : Boolean := False; 3712 -- If the generic unit is not a compilation unit, then a body may 3713 -- be present in its parent even if none is required. We create a 3714 -- tentative pending instantiation for the body, which will be 3715 -- discarded if none is actually present. 3716 3717 Scop : Entity_Id; 3718 3719 begin 3720 if Scope (Gen_Unit) /= Standard_Standard 3721 and then not Is_Child_Unit (Gen_Unit) 3722 then 3723 Scop := Scope (Gen_Unit); 3724 while Present (Scop) and then Scop /= Standard_Standard loop 3725 if Unit_Requires_Body (Scop) then 3726 Enclosing_Body_Present := True; 3727 exit; 3728 3729 elsif In_Open_Scopes (Scop) 3730 and then In_Package_Body (Scop) 3731 then 3732 Enclosing_Body_Present := True; 3733 exit; 3734 end if; 3735 3736 exit when Is_Compilation_Unit (Scop); 3737 Scop := Scope (Scop); 3738 end loop; 3739 end if; 3740 3741 -- If front-end inlining is enabled or there are any subprograms 3742 -- marked with Inline_Always, and this is a unit for which code 3743 -- will be generated, we instantiate the body at once. 3744 3745 -- This is done if the instance is not the main unit, and if the 3746 -- generic is not a child unit of another generic, to avoid scope 3747 -- problems and the reinstallation of parent instances. 3748 3749 if Expander_Active 3750 and then (not Is_Child_Unit (Gen_Unit) 3751 or else not Is_Generic_Unit (Scope (Gen_Unit))) 3752 and then Might_Inline_Subp 3753 and then not Is_Actual_Pack 3754 then 3755 if not Back_End_Inlining 3756 and then (Front_End_Inlining or else Has_Inline_Always) 3757 and then (Is_In_Main_Unit (N) 3758 or else In_Main_Context (Current_Scope)) 3759 and then Nkind (Parent (N)) /= N_Compilation_Unit 3760 then 3761 Inline_Now := True; 3762 3763 -- In configurable_run_time mode we force the inlining of 3764 -- predefined subprograms marked Inline_Always, to minimize 3765 -- the use of the run-time library. 3766 3767 elsif Is_Predefined_File_Name 3768 (Unit_File_Name (Get_Source_Unit (Gen_Decl))) 3769 and then Configurable_Run_Time_Mode 3770 and then Nkind (Parent (N)) /= N_Compilation_Unit 3771 then 3772 Inline_Now := True; 3773 end if; 3774 3775 -- If the current scope is itself an instance within a child 3776 -- unit, there will be duplications in the scope stack, and the 3777 -- unstacking mechanism in Inline_Instance_Body will fail. 3778 -- This loses some rare cases of optimization, and might be 3779 -- improved some day, if we can find a proper abstraction for 3780 -- "the complete compilation context" that can be saved and 3781 -- restored. ??? 3782 3783 if Is_Generic_Instance (Current_Scope) then 3784 declare 3785 Curr_Unit : constant Entity_Id := 3786 Cunit_Entity (Current_Sem_Unit); 3787 begin 3788 if Curr_Unit /= Current_Scope 3789 and then Is_Child_Unit (Curr_Unit) 3790 then 3791 Inline_Now := False; 3792 end if; 3793 end; 3794 end if; 3795 end if; 3796 3797 Needs_Body := 3798 (Unit_Requires_Body (Gen_Unit) 3799 or else Enclosing_Body_Present 3800 or else Present (Corresponding_Body (Gen_Decl))) 3801 and then (Is_In_Main_Unit (N) or else Might_Inline_Subp) 3802 and then not Is_Actual_Pack 3803 and then not Inline_Now 3804 and then (Operating_Mode = Generate_Code 3805 3806 -- Need comment for this check ??? 3807 3808 or else (Operating_Mode = Check_Semantics 3809 and then (ASIS_Mode or GNATprove_Mode))); 3810 3811 -- If front-end inlining is enabled or there are any subprograms 3812 -- marked with Inline_Always, do not instantiate body when within 3813 -- a generic context. 3814 3815 if ((Front_End_Inlining or else Has_Inline_Always) 3816 and then not Expander_Active) 3817 or else Is_Generic_Unit (Cunit_Entity (Main_Unit)) 3818 then 3819 Needs_Body := False; 3820 end if; 3821 3822 -- If the current context is generic, and the package being 3823 -- instantiated is declared within a formal package, there is no 3824 -- body to instantiate until the enclosing generic is instantiated 3825 -- and there is an actual for the formal package. If the formal 3826 -- package has parameters, we build a regular package instance for 3827 -- it, that precedes the original formal package declaration. 3828 3829 if In_Open_Scopes (Scope (Scope (Gen_Unit))) then 3830 declare 3831 Decl : constant Node_Id := 3832 Original_Node 3833 (Unit_Declaration_Node (Scope (Gen_Unit))); 3834 begin 3835 if Nkind (Decl) = N_Formal_Package_Declaration 3836 or else (Nkind (Decl) = N_Package_Declaration 3837 and then Is_List_Member (Decl) 3838 and then Present (Next (Decl)) 3839 and then 3840 Nkind (Next (Decl)) = 3841 N_Formal_Package_Declaration) 3842 then 3843 Needs_Body := False; 3844 end if; 3845 end; 3846 end if; 3847 end; 3848 3849 -- For RCI unit calling stubs, we omit the instance body if the 3850 -- instance is the RCI library unit itself. 3851 3852 -- However there is a special case for nested instances: in this case 3853 -- we do generate the instance body, as it might be required, e.g. 3854 -- because it provides stream attributes for some type used in the 3855 -- profile of a remote subprogram. This is consistent with 12.3(12), 3856 -- which indicates that the instance body occurs at the place of the 3857 -- instantiation, and thus is part of the RCI declaration, which is 3858 -- present on all client partitions (this is E.2.3(18)). 3859 3860 -- Note that AI12-0002 may make it illegal at some point to have 3861 -- stream attributes defined in an RCI unit, in which case this 3862 -- special case will become unnecessary. In the meantime, there 3863 -- is known application code in production that depends on this 3864 -- being possible, so we definitely cannot eliminate the body in 3865 -- the case of nested instances for the time being. 3866 3867 -- When we generate a nested instance body, calling stubs for any 3868 -- relevant subprogram will be be inserted immediately after the 3869 -- subprogram declarations, and will take precedence over the 3870 -- subsequent (original) body. (The stub and original body will be 3871 -- complete homographs, but this is permitted in an instance). 3872 -- (Could we do better and remove the original body???) 3873 3874 if Distribution_Stub_Mode = Generate_Caller_Stub_Body 3875 and then Comes_From_Source (N) 3876 and then Nkind (Parent (N)) = N_Compilation_Unit 3877 then 3878 Needs_Body := False; 3879 end if; 3880 3881 if Needs_Body then 3882 3883 -- Here is a defence against a ludicrous number of instantiations 3884 -- caused by a circular set of instantiation attempts. 3885 3886 if Pending_Instantiations.Last > Maximum_Instantiations then 3887 Error_Msg_Uint_1 := UI_From_Int (Maximum_Instantiations); 3888 Error_Msg_N ("too many instantiations, exceeds max of^", N); 3889 Error_Msg_N ("\limit can be changed using -gnateinn switch", N); 3890 raise Unrecoverable_Error; 3891 end if; 3892 3893 -- Indicate that the enclosing scopes contain an instantiation, 3894 -- and that cleanup actions should be delayed until after the 3895 -- instance body is expanded. 3896 3897 Check_Forward_Instantiation (Gen_Decl); 3898 if Nkind (N) = N_Package_Instantiation then 3899 declare 3900 Enclosing_Master : Entity_Id; 3901 3902 begin 3903 -- Loop to search enclosing masters 3904 3905 Enclosing_Master := Current_Scope; 3906 Scope_Loop : while Enclosing_Master /= Standard_Standard loop 3907 if Ekind (Enclosing_Master) = E_Package then 3908 if Is_Compilation_Unit (Enclosing_Master) then 3909 if In_Package_Body (Enclosing_Master) then 3910 Delay_Descriptors 3911 (Body_Entity (Enclosing_Master)); 3912 else 3913 Delay_Descriptors 3914 (Enclosing_Master); 3915 end if; 3916 3917 exit Scope_Loop; 3918 3919 else 3920 Enclosing_Master := Scope (Enclosing_Master); 3921 end if; 3922 3923 elsif Is_Generic_Unit (Enclosing_Master) 3924 or else Ekind (Enclosing_Master) = E_Void 3925 then 3926 -- Cleanup actions will eventually be performed on the 3927 -- enclosing subprogram or package instance, if any. 3928 -- Enclosing scope is void in the formal part of a 3929 -- generic subprogram. 3930 3931 exit Scope_Loop; 3932 3933 else 3934 if Ekind (Enclosing_Master) = E_Entry 3935 and then 3936 Ekind (Scope (Enclosing_Master)) = E_Protected_Type 3937 then 3938 if not Expander_Active then 3939 exit Scope_Loop; 3940 else 3941 Enclosing_Master := 3942 Protected_Body_Subprogram (Enclosing_Master); 3943 end if; 3944 end if; 3945 3946 Set_Delay_Cleanups (Enclosing_Master); 3947 3948 while Ekind (Enclosing_Master) = E_Block loop 3949 Enclosing_Master := Scope (Enclosing_Master); 3950 end loop; 3951 3952 if Is_Subprogram (Enclosing_Master) then 3953 Delay_Descriptors (Enclosing_Master); 3954 3955 elsif Is_Task_Type (Enclosing_Master) then 3956 declare 3957 TBP : constant Node_Id := 3958 Get_Task_Body_Procedure 3959 (Enclosing_Master); 3960 begin 3961 if Present (TBP) then 3962 Delay_Descriptors (TBP); 3963 Set_Delay_Cleanups (TBP); 3964 end if; 3965 end; 3966 end if; 3967 3968 exit Scope_Loop; 3969 end if; 3970 end loop Scope_Loop; 3971 end; 3972 3973 -- Make entry in table 3974 3975 Pending_Instantiations.Append 3976 ((Inst_Node => N, 3977 Act_Decl => Act_Decl, 3978 Expander_Status => Expander_Active, 3979 Current_Sem_Unit => Current_Sem_Unit, 3980 Scope_Suppress => Scope_Suppress, 3981 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top, 3982 Version => Ada_Version, 3983 Version_Pragma => Ada_Version_Pragma, 3984 Warnings => Save_Warnings, 3985 SPARK_Mode => SPARK_Mode, 3986 SPARK_Mode_Pragma => SPARK_Mode_Pragma)); 3987 end if; 3988 end if; 3989 3990 Set_Categorization_From_Pragmas (Act_Decl); 3991 3992 if Parent_Installed then 3993 Hide_Current_Scope; 3994 end if; 3995 3996 Set_Instance_Spec (N, Act_Decl); 3997 3998 -- If not a compilation unit, insert the package declaration before 3999 -- the original instantiation node. 4000 4001 if Nkind (Parent (N)) /= N_Compilation_Unit then 4002 Mark_Rewrite_Insertion (Act_Decl); 4003 Insert_Before (N, Act_Decl); 4004 4005 if Has_Aspects (N) then 4006 Analyze_Aspect_Specifications (N, Act_Decl_Id); 4007 4008 -- The pragma created for a Default_Storage_Pool aspect must 4009 -- appear ahead of the declarations in the instance spec. 4010 -- Analysis has placed it after the instance node, so remove 4011 -- it and reinsert it properly now. 4012 4013 declare 4014 ASN : constant Node_Id := First (Aspect_Specifications (N)); 4015 A_Name : constant Name_Id := Chars (Identifier (ASN)); 4016 Decl : Node_Id; 4017 4018 begin 4019 if A_Name = Name_Default_Storage_Pool then 4020 if No (Visible_Declarations (Act_Spec)) then 4021 Set_Visible_Declarations (Act_Spec, New_List); 4022 end if; 4023 4024 Decl := Next (N); 4025 while Present (Decl) loop 4026 if Nkind (Decl) = N_Pragma then 4027 Remove (Decl); 4028 Prepend (Decl, Visible_Declarations (Act_Spec)); 4029 exit; 4030 end if; 4031 4032 Next (Decl); 4033 end loop; 4034 end if; 4035 end; 4036 end if; 4037 4038 Analyze (Act_Decl); 4039 4040 -- For an instantiation that is a compilation unit, place 4041 -- declaration on current node so context is complete for analysis 4042 -- (including nested instantiations). If this is the main unit, 4043 -- the declaration eventually replaces the instantiation node. 4044 -- If the instance body is created later, it replaces the 4045 -- instance node, and the declaration is attached to it 4046 -- (see Build_Instance_Compilation_Unit_Nodes). 4047 4048 else 4049 if Cunit_Entity (Current_Sem_Unit) = Defining_Entity (N) then 4050 4051 -- The entity for the current unit is the newly created one, 4052 -- and all semantic information is attached to it. 4053 4054 Set_Cunit_Entity (Current_Sem_Unit, Act_Decl_Id); 4055 4056 -- If this is the main unit, replace the main entity as well 4057 4058 if Current_Sem_Unit = Main_Unit then 4059 Main_Unit_Entity := Act_Decl_Id; 4060 end if; 4061 end if; 4062 4063 Set_Unit (Parent (N), Act_Decl); 4064 Set_Parent_Spec (Act_Decl, Parent_Spec (N)); 4065 Set_Package_Instantiation (Act_Decl_Id, N); 4066 4067 -- Process aspect specifications of the instance node, if any, to 4068 -- take into account categorization pragmas before analyzing the 4069 -- instance. 4070 4071 if Has_Aspects (N) then 4072 Analyze_Aspect_Specifications (N, Act_Decl_Id); 4073 end if; 4074 4075 Analyze (Act_Decl); 4076 Set_Unit (Parent (N), N); 4077 Set_Body_Required (Parent (N), False); 4078 4079 -- We never need elaboration checks on instantiations, since by 4080 -- definition, the body instantiation is elaborated at the same 4081 -- time as the spec instantiation. 4082 4083 Set_Suppress_Elaboration_Warnings (Act_Decl_Id); 4084 Set_Kill_Elaboration_Checks (Act_Decl_Id); 4085 end if; 4086 4087 Check_Elab_Instantiation (N); 4088 4089 if ABE_Is_Certain (N) and then Needs_Body then 4090 Pending_Instantiations.Decrement_Last; 4091 end if; 4092 4093 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id); 4094 4095 Set_First_Private_Entity (Defining_Unit_Name (Unit_Renaming), 4096 First_Private_Entity (Act_Decl_Id)); 4097 4098 -- If the instantiation will receive a body, the unit will be 4099 -- transformed into a package body, and receive its own elaboration 4100 -- entity. Otherwise, the nature of the unit is now a package 4101 -- declaration. 4102 4103 if Nkind (Parent (N)) = N_Compilation_Unit 4104 and then not Needs_Body 4105 then 4106 Rewrite (N, Act_Decl); 4107 end if; 4108 4109 if Present (Corresponding_Body (Gen_Decl)) 4110 or else Unit_Requires_Body (Gen_Unit) 4111 then 4112 Set_Has_Completion (Act_Decl_Id); 4113 end if; 4114 4115 Check_Formal_Packages (Act_Decl_Id); 4116 4117 Restore_Hidden_Primitives (Vis_Prims_List); 4118 Restore_Private_Views (Act_Decl_Id); 4119 4120 Inherit_Context (Gen_Decl, N); 4121 4122 if Parent_Installed then 4123 Remove_Parent; 4124 end if; 4125 4126 Restore_Env; 4127 Env_Installed := False; 4128 end if; 4129 4130 Validate_Categorization_Dependency (N, Act_Decl_Id); 4131 4132 -- There used to be a check here to prevent instantiations in local 4133 -- contexts if the No_Local_Allocators restriction was active. This 4134 -- check was removed by a binding interpretation in AI-95-00130/07, 4135 -- but we retain the code for documentation purposes. 4136 4137 -- if Ekind (Act_Decl_Id) /= E_Void 4138 -- and then not Is_Library_Level_Entity (Act_Decl_Id) 4139 -- then 4140 -- Check_Restriction (No_Local_Allocators, N); 4141 -- end if; 4142 4143 if Inline_Now then 4144 Inline_Instance_Body (N, Gen_Unit, Act_Decl); 4145 end if; 4146 4147 -- The following is a tree patch for ASIS: ASIS needs separate nodes to 4148 -- be used as defining identifiers for a formal package and for the 4149 -- corresponding expanded package. 4150 4151 if Nkind (N) = N_Formal_Package_Declaration then 4152 Act_Decl_Id := New_Copy (Defining_Entity (N)); 4153 Set_Comes_From_Source (Act_Decl_Id, True); 4154 Set_Is_Generic_Instance (Act_Decl_Id, False); 4155 Set_Defining_Identifier (N, Act_Decl_Id); 4156 end if; 4157 4158 Ignore_Pragma_SPARK_Mode := Save_IPSM; 4159 SPARK_Mode := Save_SM; 4160 SPARK_Mode_Pragma := Save_SMP; 4161 Style_Check := Save_Style_Check; 4162 4163 if SPARK_Mode = On then 4164 Dynamic_Elaboration_Checks := False; 4165 end if; 4166 4167 -- Check that if N is an instantiation of System.Dim_Float_IO or 4168 -- System.Dim_Integer_IO, the formal type has a dimension system. 4169 4170 if Nkind (N) = N_Package_Instantiation 4171 and then Is_Dim_IO_Package_Instantiation (N) 4172 then 4173 declare 4174 Assoc : constant Node_Id := First (Generic_Associations (N)); 4175 begin 4176 if not Has_Dimension_System 4177 (Etype (Explicit_Generic_Actual_Parameter (Assoc))) 4178 then 4179 Error_Msg_N ("type with a dimension system expected", Assoc); 4180 end if; 4181 end; 4182 end if; 4183 4184 <<Leave>> 4185 if Has_Aspects (N) and then Nkind (Parent (N)) /= N_Compilation_Unit then 4186 Analyze_Aspect_Specifications (N, Act_Decl_Id); 4187 end if; 4188 4189 exception 4190 when Instantiation_Error => 4191 if Parent_Installed then 4192 Remove_Parent; 4193 end if; 4194 4195 if Env_Installed then 4196 Restore_Env; 4197 end if; 4198 4199 Ignore_Pragma_SPARK_Mode := Save_IPSM; 4200 SPARK_Mode := Save_SM; 4201 SPARK_Mode_Pragma := Save_SMP; 4202 Style_Check := Save_Style_Check; 4203 4204 if SPARK_Mode = On then 4205 Dynamic_Elaboration_Checks := False; 4206 end if; 4207 end Analyze_Package_Instantiation; 4208 4209 -------------------------- 4210 -- Inline_Instance_Body -- 4211 -------------------------- 4212 4213 procedure Inline_Instance_Body 4214 (N : Node_Id; 4215 Gen_Unit : Entity_Id; 4216 Act_Decl : Node_Id) 4217 is 4218 Curr_Comp : constant Node_Id := Cunit (Current_Sem_Unit); 4219 Curr_Unit : constant Entity_Id := Cunit_Entity (Current_Sem_Unit); 4220 Gen_Comp : constant Entity_Id := 4221 Cunit_Entity (Get_Source_Unit (Gen_Unit)); 4222 4223 Save_SM : constant SPARK_Mode_Type := SPARK_Mode; 4224 Save_SMP : constant Node_Id := SPARK_Mode_Pragma; 4225 -- Save all SPARK_Mode-related attributes as removing enclosing scopes 4226 -- to provide a clean environment for analysis of the inlined body will 4227 -- eliminate any previously set SPARK_Mode. 4228 4229 Scope_Stack_Depth : constant Int := 4230 Scope_Stack.Last - Scope_Stack.First + 1; 4231 4232 Use_Clauses : array (1 .. Scope_Stack_Depth) of Node_Id; 4233 Instances : array (1 .. Scope_Stack_Depth) of Entity_Id; 4234 Inner_Scopes : array (1 .. Scope_Stack_Depth) of Entity_Id; 4235 Curr_Scope : Entity_Id := Empty; 4236 List : Elist_Id; 4237 Num_Inner : Int := 0; 4238 Num_Scopes : Int := 0; 4239 N_Instances : Int := 0; 4240 Removed : Boolean := False; 4241 S : Entity_Id; 4242 Vis : Boolean; 4243 4244 begin 4245 -- Case of generic unit defined in another unit. We must remove the 4246 -- complete context of the current unit to install that of the generic. 4247 4248 if Gen_Comp /= Cunit_Entity (Current_Sem_Unit) then 4249 4250 -- Add some comments for the following two loops ??? 4251 4252 S := Current_Scope; 4253 while Present (S) and then S /= Standard_Standard loop 4254 loop 4255 Num_Scopes := Num_Scopes + 1; 4256 4257 Use_Clauses (Num_Scopes) := 4258 (Scope_Stack.Table 4259 (Scope_Stack.Last - Num_Scopes + 1). 4260 First_Use_Clause); 4261 End_Use_Clauses (Use_Clauses (Num_Scopes)); 4262 4263 exit when Scope_Stack.Last - Num_Scopes + 1 = Scope_Stack.First 4264 or else Scope_Stack.Table 4265 (Scope_Stack.Last - Num_Scopes).Entity = Scope (S); 4266 end loop; 4267 4268 exit when Is_Generic_Instance (S) 4269 and then (In_Package_Body (S) 4270 or else Ekind (S) = E_Procedure 4271 or else Ekind (S) = E_Function); 4272 S := Scope (S); 4273 end loop; 4274 4275 Vis := Is_Immediately_Visible (Gen_Comp); 4276 4277 -- Find and save all enclosing instances 4278 4279 S := Current_Scope; 4280 4281 while Present (S) 4282 and then S /= Standard_Standard 4283 loop 4284 if Is_Generic_Instance (S) then 4285 N_Instances := N_Instances + 1; 4286 Instances (N_Instances) := S; 4287 4288 exit when In_Package_Body (S); 4289 end if; 4290 4291 S := Scope (S); 4292 end loop; 4293 4294 -- Remove context of current compilation unit, unless we are within a 4295 -- nested package instantiation, in which case the context has been 4296 -- removed previously. 4297 4298 -- If current scope is the body of a child unit, remove context of 4299 -- spec as well. If an enclosing scope is an instance body, the 4300 -- context has already been removed, but the entities in the body 4301 -- must be made invisible as well. 4302 4303 S := Current_Scope; 4304 while Present (S) and then S /= Standard_Standard loop 4305 if Is_Generic_Instance (S) 4306 and then (In_Package_Body (S) 4307 or else Ekind_In (S, E_Procedure, E_Function)) 4308 then 4309 -- We still have to remove the entities of the enclosing 4310 -- instance from direct visibility. 4311 4312 declare 4313 E : Entity_Id; 4314 begin 4315 E := First_Entity (S); 4316 while Present (E) loop 4317 Set_Is_Immediately_Visible (E, False); 4318 Next_Entity (E); 4319 end loop; 4320 end; 4321 4322 exit; 4323 end if; 4324 4325 if S = Curr_Unit 4326 or else (Ekind (Curr_Unit) = E_Package_Body 4327 and then S = Spec_Entity (Curr_Unit)) 4328 or else (Ekind (Curr_Unit) = E_Subprogram_Body 4329 and then S = Corresponding_Spec 4330 (Unit_Declaration_Node (Curr_Unit))) 4331 then 4332 Removed := True; 4333 4334 -- Remove entities in current scopes from visibility, so that 4335 -- instance body is compiled in a clean environment. 4336 4337 List := Save_Scope_Stack (Handle_Use => False); 4338 4339 if Is_Child_Unit (S) then 4340 4341 -- Remove child unit from stack, as well as inner scopes. 4342 -- Removing the context of a child unit removes parent units 4343 -- as well. 4344 4345 while Current_Scope /= S loop 4346 Num_Inner := Num_Inner + 1; 4347 Inner_Scopes (Num_Inner) := Current_Scope; 4348 Pop_Scope; 4349 end loop; 4350 4351 Pop_Scope; 4352 Remove_Context (Curr_Comp); 4353 Curr_Scope := S; 4354 4355 else 4356 Remove_Context (Curr_Comp); 4357 end if; 4358 4359 if Ekind (Curr_Unit) = E_Package_Body then 4360 Remove_Context (Library_Unit (Curr_Comp)); 4361 end if; 4362 end if; 4363 4364 S := Scope (S); 4365 end loop; 4366 4367 pragma Assert (Num_Inner < Num_Scopes); 4368 4369 -- The inlined package body must be analyzed with the SPARK_Mode of 4370 -- the enclosing context, otherwise the body may cause bogus errors 4371 -- if a configuration SPARK_Mode pragma in in effect. 4372 4373 Push_Scope (Standard_Standard); 4374 Scope_Stack.Table (Scope_Stack.Last).Is_Active_Stack_Base := True; 4375 Instantiate_Package_Body 4376 (Body_Info => 4377 ((Inst_Node => N, 4378 Act_Decl => Act_Decl, 4379 Expander_Status => Expander_Active, 4380 Current_Sem_Unit => Current_Sem_Unit, 4381 Scope_Suppress => Scope_Suppress, 4382 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top, 4383 Version => Ada_Version, 4384 Version_Pragma => Ada_Version_Pragma, 4385 Warnings => Save_Warnings, 4386 SPARK_Mode => Save_SM, 4387 SPARK_Mode_Pragma => Save_SMP)), 4388 Inlined_Body => True); 4389 4390 Pop_Scope; 4391 4392 -- Restore context 4393 4394 Set_Is_Immediately_Visible (Gen_Comp, Vis); 4395 4396 -- Reset Generic_Instance flag so that use clauses can be installed 4397 -- in the proper order. (See Use_One_Package for effect of enclosing 4398 -- instances on processing of use clauses). 4399 4400 for J in 1 .. N_Instances loop 4401 Set_Is_Generic_Instance (Instances (J), False); 4402 end loop; 4403 4404 if Removed then 4405 Install_Context (Curr_Comp); 4406 4407 if Present (Curr_Scope) 4408 and then Is_Child_Unit (Curr_Scope) 4409 then 4410 Push_Scope (Curr_Scope); 4411 Set_Is_Immediately_Visible (Curr_Scope); 4412 4413 -- Finally, restore inner scopes as well 4414 4415 for J in reverse 1 .. Num_Inner loop 4416 Push_Scope (Inner_Scopes (J)); 4417 end loop; 4418 end if; 4419 4420 Restore_Scope_Stack (List, Handle_Use => False); 4421 4422 if Present (Curr_Scope) 4423 and then 4424 (In_Private_Part (Curr_Scope) 4425 or else In_Package_Body (Curr_Scope)) 4426 then 4427 -- Install private declaration of ancestor units, which are 4428 -- currently available. Restore_Scope_Stack and Install_Context 4429 -- only install the visible part of parents. 4430 4431 declare 4432 Par : Entity_Id; 4433 begin 4434 Par := Scope (Curr_Scope); 4435 while (Present (Par)) and then Par /= Standard_Standard loop 4436 Install_Private_Declarations (Par); 4437 Par := Scope (Par); 4438 end loop; 4439 end; 4440 end if; 4441 end if; 4442 4443 -- Restore use clauses. For a child unit, use clauses in the parents 4444 -- are restored when installing the context, so only those in inner 4445 -- scopes (and those local to the child unit itself) need to be 4446 -- installed explicitly. 4447 4448 if Is_Child_Unit (Curr_Unit) and then Removed then 4449 for J in reverse 1 .. Num_Inner + 1 loop 4450 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause := 4451 Use_Clauses (J); 4452 Install_Use_Clauses (Use_Clauses (J)); 4453 end loop; 4454 4455 else 4456 for J in reverse 1 .. Num_Scopes loop 4457 Scope_Stack.Table (Scope_Stack.Last - J + 1).First_Use_Clause := 4458 Use_Clauses (J); 4459 Install_Use_Clauses (Use_Clauses (J)); 4460 end loop; 4461 end if; 4462 4463 -- Restore status of instances. If one of them is a body, make its 4464 -- local entities visible again. 4465 4466 declare 4467 E : Entity_Id; 4468 Inst : Entity_Id; 4469 4470 begin 4471 for J in 1 .. N_Instances loop 4472 Inst := Instances (J); 4473 Set_Is_Generic_Instance (Inst, True); 4474 4475 if In_Package_Body (Inst) 4476 or else Ekind_In (S, E_Procedure, E_Function) 4477 then 4478 E := First_Entity (Instances (J)); 4479 while Present (E) loop 4480 Set_Is_Immediately_Visible (E); 4481 Next_Entity (E); 4482 end loop; 4483 end if; 4484 end loop; 4485 end; 4486 4487 -- If generic unit is in current unit, current context is correct. Note 4488 -- that the context is guaranteed to carry the correct SPARK_Mode as no 4489 -- enclosing scopes were removed. 4490 4491 else 4492 Instantiate_Package_Body 4493 (Body_Info => 4494 ((Inst_Node => N, 4495 Act_Decl => Act_Decl, 4496 Expander_Status => Expander_Active, 4497 Current_Sem_Unit => Current_Sem_Unit, 4498 Scope_Suppress => Scope_Suppress, 4499 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top, 4500 Version => Ada_Version, 4501 Version_Pragma => Ada_Version_Pragma, 4502 Warnings => Save_Warnings, 4503 SPARK_Mode => SPARK_Mode, 4504 SPARK_Mode_Pragma => SPARK_Mode_Pragma)), 4505 Inlined_Body => True); 4506 end if; 4507 end Inline_Instance_Body; 4508 4509 ------------------------------------- 4510 -- Analyze_Procedure_Instantiation -- 4511 ------------------------------------- 4512 4513 procedure Analyze_Procedure_Instantiation (N : Node_Id) is 4514 begin 4515 Analyze_Subprogram_Instantiation (N, E_Procedure); 4516 end Analyze_Procedure_Instantiation; 4517 4518 ----------------------------------- 4519 -- Need_Subprogram_Instance_Body -- 4520 ----------------------------------- 4521 4522 function Need_Subprogram_Instance_Body 4523 (N : Node_Id; 4524 Subp : Entity_Id) return Boolean 4525 is 4526 begin 4527 -- Must be inlined (or inlined renaming) 4528 4529 if (Is_In_Main_Unit (N) 4530 or else Is_Inlined (Subp) 4531 or else Is_Inlined (Alias (Subp))) 4532 4533 -- Must be generating code or analyzing code in ASIS/GNATprove mode 4534 4535 and then (Operating_Mode = Generate_Code 4536 or else (Operating_Mode = Check_Semantics 4537 and then (ASIS_Mode or GNATprove_Mode))) 4538 4539 -- The body is needed when generating code (full expansion), in ASIS 4540 -- mode for other tools, and in GNATprove mode (special expansion) for 4541 -- formal verification of the body itself. 4542 4543 and then (Expander_Active or ASIS_Mode or GNATprove_Mode) 4544 4545 -- No point in inlining if ABE is inevitable 4546 4547 and then not ABE_Is_Certain (N) 4548 4549 -- Or if subprogram is eliminated 4550 4551 and then not Is_Eliminated (Subp) 4552 then 4553 Pending_Instantiations.Append 4554 ((Inst_Node => N, 4555 Act_Decl => Unit_Declaration_Node (Subp), 4556 Expander_Status => Expander_Active, 4557 Current_Sem_Unit => Current_Sem_Unit, 4558 Scope_Suppress => Scope_Suppress, 4559 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top, 4560 Version => Ada_Version, 4561 Version_Pragma => Ada_Version_Pragma, 4562 Warnings => Save_Warnings, 4563 SPARK_Mode => SPARK_Mode, 4564 SPARK_Mode_Pragma => SPARK_Mode_Pragma)); 4565 return True; 4566 4567 -- Here if not inlined, or we ignore the inlining 4568 4569 else 4570 return False; 4571 end if; 4572 end Need_Subprogram_Instance_Body; 4573 4574 -------------------------------------- 4575 -- Analyze_Subprogram_Instantiation -- 4576 -------------------------------------- 4577 4578 procedure Analyze_Subprogram_Instantiation 4579 (N : Node_Id; 4580 K : Entity_Kind) 4581 is 4582 Loc : constant Source_Ptr := Sloc (N); 4583 Gen_Id : constant Node_Id := Name (N); 4584 4585 Anon_Id : constant Entity_Id := 4586 Make_Defining_Identifier (Sloc (Defining_Entity (N)), 4587 Chars => New_External_Name 4588 (Chars (Defining_Entity (N)), 'R')); 4589 4590 Act_Decl_Id : Entity_Id; 4591 Act_Decl : Node_Id; 4592 Act_Spec : Node_Id; 4593 Act_Tree : Node_Id; 4594 4595 Env_Installed : Boolean := False; 4596 Gen_Unit : Entity_Id; 4597 Gen_Decl : Node_Id; 4598 Pack_Id : Entity_Id; 4599 Parent_Installed : Boolean := False; 4600 4601 Renaming_List : List_Id; 4602 -- The list of declarations that link formals and actuals of the 4603 -- instance. These are subtype declarations for formal types, and 4604 -- renaming declarations for other formals. The subprogram declaration 4605 -- for the instance is then appended to the list, and the last item on 4606 -- the list is the renaming declaration for the instance. 4607 4608 procedure Analyze_Instance_And_Renamings; 4609 -- The instance must be analyzed in a context that includes the mappings 4610 -- of generic parameters into actuals. We create a package declaration 4611 -- for this purpose, and a subprogram with an internal name within the 4612 -- package. The subprogram instance is simply an alias for the internal 4613 -- subprogram, declared in the current scope. 4614 4615 procedure Build_Subprogram_Renaming; 4616 -- If the subprogram is recursive, there are occurrences of the name of 4617 -- the generic within the body, which must resolve to the current 4618 -- instance. We add a renaming declaration after the declaration, which 4619 -- is available in the instance body, as well as in the analysis of 4620 -- aspects that appear in the generic. This renaming declaration is 4621 -- inserted after the instance declaration which it renames. 4622 4623 procedure Instantiate_Contract (Subp_Id : Entity_Id); 4624 -- Instantiate all source pragmas found in the contract of subprogram 4625 -- Subp_Id. The instantiated pragmas are added to list Renaming_List. 4626 4627 ------------------------------------ 4628 -- Analyze_Instance_And_Renamings -- 4629 ------------------------------------ 4630 4631 procedure Analyze_Instance_And_Renamings is 4632 Def_Ent : constant Entity_Id := Defining_Entity (N); 4633 Pack_Decl : Node_Id; 4634 4635 begin 4636 if Nkind (Parent (N)) = N_Compilation_Unit then 4637 4638 -- For the case of a compilation unit, the container package has 4639 -- the same name as the instantiation, to insure that the binder 4640 -- calls the elaboration procedure with the right name. Copy the 4641 -- entity of the instance, which may have compilation level flags 4642 -- (e.g. Is_Child_Unit) set. 4643 4644 Pack_Id := New_Copy (Def_Ent); 4645 4646 else 4647 -- Otherwise we use the name of the instantiation concatenated 4648 -- with its source position to ensure uniqueness if there are 4649 -- several instantiations with the same name. 4650 4651 Pack_Id := 4652 Make_Defining_Identifier (Loc, 4653 Chars => New_External_Name 4654 (Related_Id => Chars (Def_Ent), 4655 Suffix => "GP", 4656 Suffix_Index => Source_Offset (Sloc (Def_Ent)))); 4657 end if; 4658 4659 Pack_Decl := 4660 Make_Package_Declaration (Loc, 4661 Specification => Make_Package_Specification (Loc, 4662 Defining_Unit_Name => Pack_Id, 4663 Visible_Declarations => Renaming_List, 4664 End_Label => Empty)); 4665 4666 Set_Instance_Spec (N, Pack_Decl); 4667 Set_Is_Generic_Instance (Pack_Id); 4668 Set_Debug_Info_Needed (Pack_Id); 4669 4670 -- Case of not a compilation unit 4671 4672 if Nkind (Parent (N)) /= N_Compilation_Unit then 4673 Mark_Rewrite_Insertion (Pack_Decl); 4674 Insert_Before (N, Pack_Decl); 4675 Set_Has_Completion (Pack_Id); 4676 4677 -- Case of an instantiation that is a compilation unit 4678 4679 -- Place declaration on current node so context is complete for 4680 -- analysis (including nested instantiations), and for use in a 4681 -- context_clause (see Analyze_With_Clause). 4682 4683 else 4684 Set_Unit (Parent (N), Pack_Decl); 4685 Set_Parent_Spec (Pack_Decl, Parent_Spec (N)); 4686 end if; 4687 4688 Analyze (Pack_Decl); 4689 Check_Formal_Packages (Pack_Id); 4690 Set_Is_Generic_Instance (Pack_Id, False); 4691 4692 -- Why do we clear Is_Generic_Instance??? We set it 20 lines 4693 -- above??? 4694 4695 -- Body of the enclosing package is supplied when instantiating the 4696 -- subprogram body, after semantic analysis is completed. 4697 4698 if Nkind (Parent (N)) = N_Compilation_Unit then 4699 4700 -- Remove package itself from visibility, so it does not 4701 -- conflict with subprogram. 4702 4703 Set_Name_Entity_Id (Chars (Pack_Id), Homonym (Pack_Id)); 4704 4705 -- Set name and scope of internal subprogram so that the proper 4706 -- external name will be generated. The proper scope is the scope 4707 -- of the wrapper package. We need to generate debugging info for 4708 -- the internal subprogram, so set flag accordingly. 4709 4710 Set_Chars (Anon_Id, Chars (Defining_Entity (N))); 4711 Set_Scope (Anon_Id, Scope (Pack_Id)); 4712 4713 -- Mark wrapper package as referenced, to avoid spurious warnings 4714 -- if the instantiation appears in various with_ clauses of 4715 -- subunits of the main unit. 4716 4717 Set_Referenced (Pack_Id); 4718 end if; 4719 4720 Set_Is_Generic_Instance (Anon_Id); 4721 Set_Debug_Info_Needed (Anon_Id); 4722 Act_Decl_Id := New_Copy (Anon_Id); 4723 4724 Set_Parent (Act_Decl_Id, Parent (Anon_Id)); 4725 Set_Chars (Act_Decl_Id, Chars (Defining_Entity (N))); 4726 Set_Sloc (Act_Decl_Id, Sloc (Defining_Entity (N))); 4727 4728 -- Subprogram instance comes from source only if generic does 4729 4730 Set_Comes_From_Source (Act_Decl_Id, Comes_From_Source (Gen_Unit)); 4731 4732 -- The signature may involve types that are not frozen yet, but the 4733 -- subprogram will be frozen at the point the wrapper package is 4734 -- frozen, so it does not need its own freeze node. In fact, if one 4735 -- is created, it might conflict with the freezing actions from the 4736 -- wrapper package. 4737 4738 Set_Has_Delayed_Freeze (Anon_Id, False); 4739 4740 -- If the instance is a child unit, mark the Id accordingly. Mark 4741 -- the anonymous entity as well, which is the real subprogram and 4742 -- which is used when the instance appears in a context clause. 4743 -- Similarly, propagate the Is_Eliminated flag to handle properly 4744 -- nested eliminated subprograms. 4745 4746 Set_Is_Child_Unit (Act_Decl_Id, Is_Child_Unit (Defining_Entity (N))); 4747 Set_Is_Child_Unit (Anon_Id, Is_Child_Unit (Defining_Entity (N))); 4748 New_Overloaded_Entity (Act_Decl_Id); 4749 Check_Eliminated (Act_Decl_Id); 4750 Set_Is_Eliminated (Anon_Id, Is_Eliminated (Act_Decl_Id)); 4751 4752 -- In compilation unit case, kill elaboration checks on the 4753 -- instantiation, since they are never needed -- the body is 4754 -- instantiated at the same point as the spec. 4755 4756 if Nkind (Parent (N)) = N_Compilation_Unit then 4757 Set_Suppress_Elaboration_Warnings (Act_Decl_Id); 4758 Set_Kill_Elaboration_Checks (Act_Decl_Id); 4759 Set_Is_Compilation_Unit (Anon_Id); 4760 4761 Set_Cunit_Entity (Current_Sem_Unit, Pack_Id); 4762 end if; 4763 4764 -- The instance is not a freezing point for the new subprogram 4765 4766 Set_Is_Frozen (Act_Decl_Id, False); 4767 4768 if Nkind (Defining_Entity (N)) = N_Defining_Operator_Symbol then 4769 Valid_Operator_Definition (Act_Decl_Id); 4770 end if; 4771 4772 Set_Alias (Act_Decl_Id, Anon_Id); 4773 Set_Parent (Act_Decl_Id, Parent (Anon_Id)); 4774 Set_Has_Completion (Act_Decl_Id); 4775 Set_Related_Instance (Pack_Id, Act_Decl_Id); 4776 4777 if Nkind (Parent (N)) = N_Compilation_Unit then 4778 Set_Body_Required (Parent (N), False); 4779 end if; 4780 end Analyze_Instance_And_Renamings; 4781 4782 ------------------------------- 4783 -- Build_Subprogram_Renaming -- 4784 ------------------------------- 4785 4786 procedure Build_Subprogram_Renaming is 4787 Renaming_Decl : Node_Id; 4788 Unit_Renaming : Node_Id; 4789 4790 begin 4791 Unit_Renaming := 4792 Make_Subprogram_Renaming_Declaration (Loc, 4793 Specification => 4794 Copy_Generic_Node 4795 (Specification (Original_Node (Gen_Decl)), 4796 Empty, 4797 Instantiating => True), 4798 Name => New_Occurrence_Of (Anon_Id, Loc)); 4799 4800 -- The generic may be a a child unit. The renaming needs an 4801 -- identifier with the proper name. 4802 4803 Set_Defining_Unit_Name (Specification (Unit_Renaming), 4804 Make_Defining_Identifier (Loc, Chars (Gen_Unit))); 4805 4806 -- If there is a formal subprogram with the same name as the unit 4807 -- itself, do not add this renaming declaration, to prevent 4808 -- ambiguities when there is a call with that name in the body. 4809 -- This is a partial and ugly fix for one ACATS test. ??? 4810 4811 Renaming_Decl := First (Renaming_List); 4812 while Present (Renaming_Decl) loop 4813 if Nkind (Renaming_Decl) = N_Subprogram_Renaming_Declaration 4814 and then 4815 Chars (Defining_Entity (Renaming_Decl)) = Chars (Gen_Unit) 4816 then 4817 exit; 4818 end if; 4819 4820 Next (Renaming_Decl); 4821 end loop; 4822 4823 if No (Renaming_Decl) then 4824 Append (Unit_Renaming, Renaming_List); 4825 end if; 4826 end Build_Subprogram_Renaming; 4827 4828 -------------------------- 4829 -- Instantiate_Contract -- 4830 -------------------------- 4831 4832 procedure Instantiate_Contract (Subp_Id : Entity_Id) is 4833 procedure Instantiate_Pragmas (First_Prag : Node_Id); 4834 -- Instantiate all contract-related source pragmas found in the list 4835 -- starting with pragma First_Prag. Each instantiated pragma is added 4836 -- to list Renaming_List. 4837 4838 ------------------------- 4839 -- Instantiate_Pragmas -- 4840 ------------------------- 4841 4842 procedure Instantiate_Pragmas (First_Prag : Node_Id) is 4843 Inst_Prag : Node_Id; 4844 Prag : Node_Id; 4845 4846 begin 4847 Prag := First_Prag; 4848 while Present (Prag) loop 4849 if Comes_From_Source (Prag) 4850 and then Nam_In (Pragma_Name (Prag), Name_Contract_Cases, 4851 Name_Depends, 4852 Name_Extensions_Visible, 4853 Name_Global, 4854 Name_Postcondition, 4855 Name_Precondition, 4856 Name_Test_Case) 4857 then 4858 Inst_Prag := 4859 Copy_Generic_Node 4860 (Original_Node (Prag), Empty, Instantiating => True); 4861 4862 Set_Analyzed (Inst_Prag, False); 4863 Append_To (Renaming_List, Inst_Prag); 4864 end if; 4865 4866 Prag := Next_Pragma (Prag); 4867 end loop; 4868 end Instantiate_Pragmas; 4869 4870 -- Local variables 4871 4872 Items : constant Node_Id := Contract (Subp_Id); 4873 4874 -- Start of processing for Instantiate_Contract 4875 4876 begin 4877 if Present (Items) then 4878 Instantiate_Pragmas (Pre_Post_Conditions (Items)); 4879 Instantiate_Pragmas (Contract_Test_Cases (Items)); 4880 Instantiate_Pragmas (Classifications (Items)); 4881 end if; 4882 end Instantiate_Contract; 4883 4884 -- Local variables 4885 4886 Save_IPSM : constant Boolean := Ignore_Pragma_SPARK_Mode; 4887 -- Save flag Ignore_Pragma_SPARK_Mode for restore on exit 4888 4889 Save_SM : constant SPARK_Mode_Type := SPARK_Mode; 4890 Save_SMP : constant Node_Id := SPARK_Mode_Pragma; 4891 -- Save the SPARK_Mode-related data for restore on exit 4892 4893 Vis_Prims_List : Elist_Id := No_Elist; 4894 -- List of primitives made temporarily visible in the instantiation 4895 -- to match the visibility of the formal type 4896 4897 -- Start of processing for Analyze_Subprogram_Instantiation 4898 4899 begin 4900 Check_SPARK_05_Restriction ("generic is not allowed", N); 4901 4902 -- Very first thing: check for special Text_IO unit in case we are 4903 -- instantiating one of the children of [[Wide_]Wide_]Text_IO. Of course 4904 -- such an instantiation is bogus (these are packages, not subprograms), 4905 -- but we get a better error message if we do this. 4906 4907 Check_Text_IO_Special_Unit (Gen_Id); 4908 4909 -- Make node global for error reporting 4910 4911 Instantiation_Node := N; 4912 4913 -- For package instantiations we turn off style checks, because they 4914 -- will have been emitted in the generic. For subprogram instantiations 4915 -- we want to apply at least the check on overriding indicators so we 4916 -- do not modify the style check status. 4917 4918 -- The renaming declarations for the actuals do not come from source and 4919 -- will not generate spurious warnings. 4920 4921 Preanalyze_Actuals (N); 4922 4923 Init_Env; 4924 Env_Installed := True; 4925 Check_Generic_Child_Unit (Gen_Id, Parent_Installed); 4926 Gen_Unit := Entity (Gen_Id); 4927 4928 Generate_Reference (Gen_Unit, Gen_Id); 4929 4930 if Nkind (Gen_Id) = N_Identifier 4931 and then Chars (Gen_Unit) = Chars (Defining_Entity (N)) 4932 then 4933 Error_Msg_NE 4934 ("& is hidden within declaration of instance", Gen_Id, Gen_Unit); 4935 end if; 4936 4937 if Etype (Gen_Unit) = Any_Type then 4938 Restore_Env; 4939 return; 4940 end if; 4941 4942 -- Verify that it is a generic subprogram of the right kind, and that 4943 -- it does not lead to a circular instantiation. 4944 4945 if K = E_Procedure and then Ekind (Gen_Unit) /= E_Generic_Procedure then 4946 Error_Msg_NE 4947 ("& is not the name of a generic procedure", Gen_Id, Gen_Unit); 4948 4949 elsif K = E_Function and then Ekind (Gen_Unit) /= E_Generic_Function then 4950 Error_Msg_NE 4951 ("& is not the name of a generic function", Gen_Id, Gen_Unit); 4952 4953 elsif In_Open_Scopes (Gen_Unit) then 4954 Error_Msg_NE ("instantiation of & within itself", N, Gen_Unit); 4955 4956 else 4957 -- If the context of the instance is subject to SPARK_Mode "off", 4958 -- set the global flag which signals Analyze_Pragma to ignore all 4959 -- SPARK_Mode pragmas within the instance. 4960 4961 if SPARK_Mode = Off then 4962 Ignore_Pragma_SPARK_Mode := True; 4963 end if; 4964 4965 Set_Entity (Gen_Id, Gen_Unit); 4966 Set_Is_Instantiated (Gen_Unit); 4967 4968 if In_Extended_Main_Source_Unit (N) then 4969 Generate_Reference (Gen_Unit, N); 4970 end if; 4971 4972 -- If renaming, get original unit 4973 4974 if Present (Renamed_Object (Gen_Unit)) 4975 and then Ekind_In (Renamed_Object (Gen_Unit), E_Generic_Procedure, 4976 E_Generic_Function) 4977 then 4978 Gen_Unit := Renamed_Object (Gen_Unit); 4979 Set_Is_Instantiated (Gen_Unit); 4980 Generate_Reference (Gen_Unit, N); 4981 end if; 4982 4983 if Contains_Instance_Of (Gen_Unit, Current_Scope, Gen_Id) then 4984 Error_Msg_Node_2 := Current_Scope; 4985 Error_Msg_NE 4986 ("circular Instantiation: & instantiated in &!", N, Gen_Unit); 4987 Circularity_Detected := True; 4988 Restore_Hidden_Primitives (Vis_Prims_List); 4989 goto Leave; 4990 end if; 4991 4992 Gen_Decl := Unit_Declaration_Node (Gen_Unit); 4993 4994 -- Initialize renamings map, for error checking 4995 4996 Generic_Renamings.Set_Last (0); 4997 Generic_Renamings_HTable.Reset; 4998 4999 Create_Instantiation_Source (N, Gen_Unit, False, S_Adjustment); 5000 5001 -- Copy original generic tree, to produce text for instantiation 5002 5003 Act_Tree := 5004 Copy_Generic_Node 5005 (Original_Node (Gen_Decl), Empty, Instantiating => True); 5006 5007 -- Inherit overriding indicator from instance node 5008 5009 Act_Spec := Specification (Act_Tree); 5010 Set_Must_Override (Act_Spec, Must_Override (N)); 5011 Set_Must_Not_Override (Act_Spec, Must_Not_Override (N)); 5012 5013 Renaming_List := 5014 Analyze_Associations 5015 (I_Node => N, 5016 Formals => Generic_Formal_Declarations (Act_Tree), 5017 F_Copy => Generic_Formal_Declarations (Gen_Decl)); 5018 5019 Vis_Prims_List := Check_Hidden_Primitives (Renaming_List); 5020 5021 -- The subprogram itself cannot contain a nested instance, so the 5022 -- current parent is left empty. 5023 5024 Set_Instance_Env (Gen_Unit, Empty); 5025 5026 -- Build the subprogram declaration, which does not appear in the 5027 -- generic template, and give it a sloc consistent with that of the 5028 -- template. 5029 5030 Set_Defining_Unit_Name (Act_Spec, Anon_Id); 5031 Set_Generic_Parent (Act_Spec, Gen_Unit); 5032 Act_Decl := 5033 Make_Subprogram_Declaration (Sloc (Act_Spec), 5034 Specification => Act_Spec); 5035 5036 -- The aspects have been copied previously, but they have to be 5037 -- linked explicitly to the new subprogram declaration. Explicit 5038 -- pre/postconditions on the instance are analyzed below, in a 5039 -- separate step. 5040 5041 Move_Aspects (Act_Tree, To => Act_Decl); 5042 Set_Categorization_From_Pragmas (Act_Decl); 5043 5044 if Parent_Installed then 5045 Hide_Current_Scope; 5046 end if; 5047 5048 Append (Act_Decl, Renaming_List); 5049 Instantiate_Contract (Gen_Unit); 5050 Build_Subprogram_Renaming; 5051 5052 Analyze_Instance_And_Renamings; 5053 5054 -- If the generic is marked Import (Intrinsic), then so is the 5055 -- instance. This indicates that there is no body to instantiate. If 5056 -- generic is marked inline, so it the instance, and the anonymous 5057 -- subprogram it renames. If inlined, or else if inlining is enabled 5058 -- for the compilation, we generate the instance body even if it is 5059 -- not within the main unit. 5060 5061 if Is_Intrinsic_Subprogram (Gen_Unit) then 5062 Set_Is_Intrinsic_Subprogram (Anon_Id); 5063 Set_Is_Intrinsic_Subprogram (Act_Decl_Id); 5064 5065 if Chars (Gen_Unit) = Name_Unchecked_Conversion then 5066 Validate_Unchecked_Conversion (N, Act_Decl_Id); 5067 end if; 5068 end if; 5069 5070 -- Inherit convention from generic unit. Intrinsic convention, as for 5071 -- an instance of unchecked conversion, is not inherited because an 5072 -- explicit Ada instance has been created. 5073 5074 if Has_Convention_Pragma (Gen_Unit) 5075 and then Convention (Gen_Unit) /= Convention_Intrinsic 5076 then 5077 Set_Convention (Act_Decl_Id, Convention (Gen_Unit)); 5078 Set_Is_Exported (Act_Decl_Id, Is_Exported (Gen_Unit)); 5079 end if; 5080 5081 Generate_Definition (Act_Decl_Id); 5082 5083 -- Inherit all inlining-related flags which apply to the generic in 5084 -- the subprogram and its declaration. 5085 5086 Set_Is_Inlined (Act_Decl_Id, Is_Inlined (Gen_Unit)); 5087 Set_Is_Inlined (Anon_Id, Is_Inlined (Gen_Unit)); 5088 5089 Set_Has_Pragma_Inline (Act_Decl_Id, Has_Pragma_Inline (Gen_Unit)); 5090 Set_Has_Pragma_Inline (Anon_Id, Has_Pragma_Inline (Gen_Unit)); 5091 5092 Set_Has_Pragma_Inline_Always 5093 (Act_Decl_Id, Has_Pragma_Inline_Always (Gen_Unit)); 5094 Set_Has_Pragma_Inline_Always 5095 (Anon_Id, Has_Pragma_Inline_Always (Gen_Unit)); 5096 5097 if not Is_Intrinsic_Subprogram (Gen_Unit) then 5098 Check_Elab_Instantiation (N); 5099 end if; 5100 5101 if Is_Dispatching_Operation (Act_Decl_Id) 5102 and then Ada_Version >= Ada_2005 5103 then 5104 declare 5105 Formal : Entity_Id; 5106 5107 begin 5108 Formal := First_Formal (Act_Decl_Id); 5109 while Present (Formal) loop 5110 if Ekind (Etype (Formal)) = E_Anonymous_Access_Type 5111 and then Is_Controlling_Formal (Formal) 5112 and then not Can_Never_Be_Null (Formal) 5113 then 5114 Error_Msg_NE 5115 ("access parameter& is controlling,", N, Formal); 5116 Error_Msg_NE 5117 ("\corresponding parameter of & must be " 5118 & "explicitly null-excluding", N, Gen_Id); 5119 end if; 5120 5121 Next_Formal (Formal); 5122 end loop; 5123 end; 5124 end if; 5125 5126 Check_Hidden_Child_Unit (N, Gen_Unit, Act_Decl_Id); 5127 5128 Validate_Categorization_Dependency (N, Act_Decl_Id); 5129 5130 if not Is_Intrinsic_Subprogram (Act_Decl_Id) then 5131 Inherit_Context (Gen_Decl, N); 5132 5133 Restore_Private_Views (Pack_Id, False); 5134 5135 -- If the context requires a full instantiation, mark node for 5136 -- subsequent construction of the body. 5137 5138 if Need_Subprogram_Instance_Body (N, Act_Decl_Id) then 5139 Check_Forward_Instantiation (Gen_Decl); 5140 5141 -- The wrapper package is always delayed, because it does not 5142 -- constitute a freeze point, but to insure that the freeze 5143 -- node is placed properly, it is created directly when 5144 -- instantiating the body (otherwise the freeze node might 5145 -- appear to early for nested instantiations). 5146 5147 elsif Nkind (Parent (N)) = N_Compilation_Unit then 5148 5149 -- For ASIS purposes, indicate that the wrapper package has 5150 -- replaced the instantiation node. 5151 5152 Rewrite (N, Unit (Parent (N))); 5153 Set_Unit (Parent (N), N); 5154 end if; 5155 5156 elsif Nkind (Parent (N)) = N_Compilation_Unit then 5157 5158 -- Replace instance node for library-level instantiations of 5159 -- intrinsic subprograms, for ASIS use. 5160 5161 Rewrite (N, Unit (Parent (N))); 5162 Set_Unit (Parent (N), N); 5163 end if; 5164 5165 if Parent_Installed then 5166 Remove_Parent; 5167 end if; 5168 5169 Restore_Hidden_Primitives (Vis_Prims_List); 5170 Restore_Env; 5171 Env_Installed := False; 5172 Generic_Renamings.Set_Last (0); 5173 Generic_Renamings_HTable.Reset; 5174 5175 Ignore_Pragma_SPARK_Mode := Save_IPSM; 5176 SPARK_Mode := Save_SM; 5177 SPARK_Mode_Pragma := Save_SMP; 5178 5179 if SPARK_Mode = On then 5180 Dynamic_Elaboration_Checks := False; 5181 end if; 5182 5183 end if; 5184 5185 <<Leave>> 5186 if Has_Aspects (N) then 5187 Analyze_Aspect_Specifications (N, Act_Decl_Id); 5188 end if; 5189 5190 exception 5191 when Instantiation_Error => 5192 if Parent_Installed then 5193 Remove_Parent; 5194 end if; 5195 5196 if Env_Installed then 5197 Restore_Env; 5198 end if; 5199 5200 Ignore_Pragma_SPARK_Mode := Save_IPSM; 5201 SPARK_Mode := Save_SM; 5202 SPARK_Mode_Pragma := Save_SMP; 5203 5204 if SPARK_Mode = On then 5205 Dynamic_Elaboration_Checks := False; 5206 end if; 5207 end Analyze_Subprogram_Instantiation; 5208 5209 ------------------------- 5210 -- Get_Associated_Node -- 5211 ------------------------- 5212 5213 function Get_Associated_Node (N : Node_Id) return Node_Id is 5214 Assoc : Node_Id; 5215 5216 begin 5217 Assoc := Associated_Node (N); 5218 5219 if Nkind (Assoc) /= Nkind (N) then 5220 return Assoc; 5221 5222 elsif Nkind_In (Assoc, N_Aggregate, N_Extension_Aggregate) then 5223 return Assoc; 5224 5225 else 5226 -- If the node is part of an inner generic, it may itself have been 5227 -- remapped into a further generic copy. Associated_Node is otherwise 5228 -- used for the entity of the node, and will be of a different node 5229 -- kind, or else N has been rewritten as a literal or function call. 5230 5231 while Present (Associated_Node (Assoc)) 5232 and then Nkind (Associated_Node (Assoc)) = Nkind (Assoc) 5233 loop 5234 Assoc := Associated_Node (Assoc); 5235 end loop; 5236 5237 -- Follow and additional link in case the final node was rewritten. 5238 -- This can only happen with nested generic units. 5239 5240 if (Nkind (Assoc) = N_Identifier or else Nkind (Assoc) in N_Op) 5241 and then Present (Associated_Node (Assoc)) 5242 and then (Nkind_In (Associated_Node (Assoc), N_Function_Call, 5243 N_Explicit_Dereference, 5244 N_Integer_Literal, 5245 N_Real_Literal, 5246 N_String_Literal)) 5247 then 5248 Assoc := Associated_Node (Assoc); 5249 end if; 5250 5251 -- An additional special case: an unconstrained type in an object 5252 -- declaration may have been rewritten as a local subtype constrained 5253 -- by the expression in the declaration. We need to recover the 5254 -- original entity which may be global. 5255 5256 if Present (Original_Node (Assoc)) 5257 and then Nkind (Parent (N)) = N_Object_Declaration 5258 then 5259 Assoc := Original_Node (Assoc); 5260 end if; 5261 5262 return Assoc; 5263 end if; 5264 end Get_Associated_Node; 5265 5266 ---------------------------- 5267 -- Build_Function_Wrapper -- 5268 ---------------------------- 5269 5270 function Build_Function_Wrapper 5271 (Formal_Subp : Entity_Id; 5272 Actual_Subp : Entity_Id) return Node_Id 5273 is 5274 Loc : constant Source_Ptr := Sloc (Current_Scope); 5275 Ret_Type : constant Entity_Id := Get_Instance_Of (Etype (Formal_Subp)); 5276 Actuals : List_Id; 5277 Decl : Node_Id; 5278 Func_Name : Node_Id; 5279 Func : Entity_Id; 5280 Parm_Type : Node_Id; 5281 Profile : List_Id := New_List; 5282 Spec : Node_Id; 5283 Act_F : Entity_Id; 5284 Form_F : Entity_Id; 5285 New_F : Entity_Id; 5286 5287 begin 5288 Func_Name := New_Occurrence_Of (Actual_Subp, Loc); 5289 5290 Func := Make_Defining_Identifier (Loc, Chars (Formal_Subp)); 5291 Set_Ekind (Func, E_Function); 5292 Set_Is_Generic_Actual_Subprogram (Func); 5293 5294 Actuals := New_List; 5295 Profile := New_List; 5296 5297 Act_F := First_Formal (Actual_Subp); 5298 Form_F := First_Formal (Formal_Subp); 5299 while Present (Form_F) loop 5300 5301 -- Create new formal for profile of wrapper, and add a reference 5302 -- to it in the list of actuals for the enclosing call. The name 5303 -- must be that of the formal in the formal subprogram, because 5304 -- calls to it in the generic body may use named associations. 5305 5306 New_F := Make_Defining_Identifier (Loc, Chars (Form_F)); 5307 5308 Parm_Type := 5309 New_Occurrence_Of (Get_Instance_Of (Etype (Form_F)), Loc); 5310 5311 Append_To (Profile, 5312 Make_Parameter_Specification (Loc, 5313 Defining_Identifier => New_F, 5314 Parameter_Type => Parm_Type)); 5315 5316 Append_To (Actuals, New_Occurrence_Of (New_F, Loc)); 5317 Next_Formal (Form_F); 5318 5319 if Present (Act_F) then 5320 Next_Formal (Act_F); 5321 end if; 5322 end loop; 5323 5324 Spec := 5325 Make_Function_Specification (Loc, 5326 Defining_Unit_Name => Func, 5327 Parameter_Specifications => Profile, 5328 Result_Definition => New_Occurrence_Of (Ret_Type, Loc)); 5329 5330 Decl := 5331 Make_Expression_Function (Loc, 5332 Specification => Spec, 5333 Expression => 5334 Make_Function_Call (Loc, 5335 Name => Func_Name, 5336 Parameter_Associations => Actuals)); 5337 5338 return Decl; 5339 end Build_Function_Wrapper; 5340 5341 ---------------------------- 5342 -- Build_Operator_Wrapper -- 5343 ---------------------------- 5344 5345 function Build_Operator_Wrapper 5346 (Formal_Subp : Entity_Id; 5347 Actual_Subp : Entity_Id) return Node_Id 5348 is 5349 Loc : constant Source_Ptr := Sloc (Current_Scope); 5350 Ret_Type : constant Entity_Id := 5351 Get_Instance_Of (Etype (Formal_Subp)); 5352 Op_Type : constant Entity_Id := 5353 Get_Instance_Of (Etype (First_Formal (Formal_Subp))); 5354 Is_Binary : constant Boolean := 5355 Present (Next_Formal (First_Formal (Formal_Subp))); 5356 5357 Decl : Node_Id; 5358 Expr : Node_Id; 5359 F1, F2 : Entity_Id; 5360 Func : Entity_Id; 5361 Op_Name : Name_Id; 5362 Spec : Node_Id; 5363 L, R : Node_Id; 5364 5365 begin 5366 Op_Name := Chars (Actual_Subp); 5367 5368 -- Create entities for wrapper function and its formals 5369 5370 F1 := Make_Temporary (Loc, 'A'); 5371 F2 := Make_Temporary (Loc, 'B'); 5372 L := New_Occurrence_Of (F1, Loc); 5373 R := New_Occurrence_Of (F2, Loc); 5374 5375 Func := Make_Defining_Identifier (Loc, Chars (Formal_Subp)); 5376 Set_Ekind (Func, E_Function); 5377 Set_Is_Generic_Actual_Subprogram (Func); 5378 5379 Spec := 5380 Make_Function_Specification (Loc, 5381 Defining_Unit_Name => Func, 5382 Parameter_Specifications => New_List ( 5383 Make_Parameter_Specification (Loc, 5384 Defining_Identifier => F1, 5385 Parameter_Type => New_Occurrence_Of (Op_Type, Loc))), 5386 Result_Definition => New_Occurrence_Of (Ret_Type, Loc)); 5387 5388 if Is_Binary then 5389 Append_To (Parameter_Specifications (Spec), 5390 Make_Parameter_Specification (Loc, 5391 Defining_Identifier => F2, 5392 Parameter_Type => New_Occurrence_Of (Op_Type, Loc))); 5393 end if; 5394 5395 -- Build expression as a function call, or as an operator node 5396 -- that corresponds to the name of the actual, starting with 5397 -- binary operators. 5398 5399 if Op_Name not in Any_Operator_Name then 5400 Expr := 5401 Make_Function_Call (Loc, 5402 Name => 5403 New_Occurrence_Of (Actual_Subp, Loc), 5404 Parameter_Associations => New_List (L)); 5405 5406 if Is_Binary then 5407 Append_To (Parameter_Associations (Expr), R); 5408 end if; 5409 5410 -- Binary operators 5411 5412 elsif Is_Binary then 5413 if Op_Name = Name_Op_And then 5414 Expr := Make_Op_And (Loc, Left_Opnd => L, Right_Opnd => R); 5415 elsif Op_Name = Name_Op_Or then 5416 Expr := Make_Op_Or (Loc, Left_Opnd => L, Right_Opnd => R); 5417 elsif Op_Name = Name_Op_Xor then 5418 Expr := Make_Op_Xor (Loc, Left_Opnd => L, Right_Opnd => R); 5419 elsif Op_Name = Name_Op_Eq then 5420 Expr := Make_Op_Eq (Loc, Left_Opnd => L, Right_Opnd => R); 5421 elsif Op_Name = Name_Op_Ne then 5422 Expr := Make_Op_Ne (Loc, Left_Opnd => L, Right_Opnd => R); 5423 elsif Op_Name = Name_Op_Le then 5424 Expr := Make_Op_Le (Loc, Left_Opnd => L, Right_Opnd => R); 5425 elsif Op_Name = Name_Op_Gt then 5426 Expr := Make_Op_Gt (Loc, Left_Opnd => L, Right_Opnd => R); 5427 elsif Op_Name = Name_Op_Ge then 5428 Expr := Make_Op_Ge (Loc, Left_Opnd => L, Right_Opnd => R); 5429 elsif Op_Name = Name_Op_Lt then 5430 Expr := Make_Op_Lt (Loc, Left_Opnd => L, Right_Opnd => R); 5431 elsif Op_Name = Name_Op_Add then 5432 Expr := Make_Op_Add (Loc, Left_Opnd => L, Right_Opnd => R); 5433 elsif Op_Name = Name_Op_Subtract then 5434 Expr := Make_Op_Subtract (Loc, Left_Opnd => L, Right_Opnd => R); 5435 elsif Op_Name = Name_Op_Concat then 5436 Expr := Make_Op_Concat (Loc, Left_Opnd => L, Right_Opnd => R); 5437 elsif Op_Name = Name_Op_Multiply then 5438 Expr := Make_Op_Multiply (Loc, Left_Opnd => L, Right_Opnd => R); 5439 elsif Op_Name = Name_Op_Divide then 5440 Expr := Make_Op_Divide (Loc, Left_Opnd => L, Right_Opnd => R); 5441 elsif Op_Name = Name_Op_Mod then 5442 Expr := Make_Op_Mod (Loc, Left_Opnd => L, Right_Opnd => R); 5443 elsif Op_Name = Name_Op_Rem then 5444 Expr := Make_Op_Rem (Loc, Left_Opnd => L, Right_Opnd => R); 5445 elsif Op_Name = Name_Op_Expon then 5446 Expr := Make_Op_Expon (Loc, Left_Opnd => L, Right_Opnd => R); 5447 end if; 5448 5449 -- Unary operators 5450 5451 else 5452 if Op_Name = Name_Op_Add then 5453 Expr := Make_Op_Plus (Loc, Right_Opnd => L); 5454 elsif Op_Name = Name_Op_Subtract then 5455 Expr := Make_Op_Minus (Loc, Right_Opnd => L); 5456 elsif Op_Name = Name_Op_Abs then 5457 Expr := Make_Op_Abs (Loc, Right_Opnd => L); 5458 elsif Op_Name = Name_Op_Not then 5459 Expr := Make_Op_Not (Loc, Right_Opnd => L); 5460 end if; 5461 end if; 5462 5463 Decl := 5464 Make_Expression_Function (Loc, 5465 Specification => Spec, 5466 Expression => Expr); 5467 5468 return Decl; 5469 end Build_Operator_Wrapper; 5470 5471 ------------------------------------------- 5472 -- Build_Instance_Compilation_Unit_Nodes -- 5473 ------------------------------------------- 5474 5475 procedure Build_Instance_Compilation_Unit_Nodes 5476 (N : Node_Id; 5477 Act_Body : Node_Id; 5478 Act_Decl : Node_Id) 5479 is 5480 Decl_Cunit : Node_Id; 5481 Body_Cunit : Node_Id; 5482 Citem : Node_Id; 5483 New_Main : constant Entity_Id := Defining_Entity (Act_Decl); 5484 Old_Main : constant Entity_Id := Cunit_Entity (Main_Unit); 5485 5486 begin 5487 -- A new compilation unit node is built for the instance declaration 5488 5489 Decl_Cunit := 5490 Make_Compilation_Unit (Sloc (N), 5491 Context_Items => Empty_List, 5492 Unit => Act_Decl, 5493 Aux_Decls_Node => Make_Compilation_Unit_Aux (Sloc (N))); 5494 5495 Set_Parent_Spec (Act_Decl, Parent_Spec (N)); 5496 5497 -- The new compilation unit is linked to its body, but both share the 5498 -- same file, so we do not set Body_Required on the new unit so as not 5499 -- to create a spurious dependency on a non-existent body in the ali. 5500 -- This simplifies CodePeer unit traversal. 5501 5502 -- We use the original instantiation compilation unit as the resulting 5503 -- compilation unit of the instance, since this is the main unit. 5504 5505 Rewrite (N, Act_Body); 5506 5507 -- Propagate the aspect specifications from the package body template to 5508 -- the instantiated version of the package body. 5509 5510 if Has_Aspects (Act_Body) then 5511 Set_Aspect_Specifications 5512 (N, New_Copy_List_Tree (Aspect_Specifications (Act_Body))); 5513 end if; 5514 5515 Body_Cunit := Parent (N); 5516 5517 -- The two compilation unit nodes are linked by the Library_Unit field 5518 5519 Set_Library_Unit (Decl_Cunit, Body_Cunit); 5520 Set_Library_Unit (Body_Cunit, Decl_Cunit); 5521 5522 -- Preserve the private nature of the package if needed 5523 5524 Set_Private_Present (Decl_Cunit, Private_Present (Body_Cunit)); 5525 5526 -- If the instance is not the main unit, its context, categorization 5527 -- and elaboration entity are not relevant to the compilation. 5528 5529 if Body_Cunit /= Cunit (Main_Unit) then 5530 Make_Instance_Unit (Body_Cunit, In_Main => False); 5531 return; 5532 end if; 5533 5534 -- The context clause items on the instantiation, which are now attached 5535 -- to the body compilation unit (since the body overwrote the original 5536 -- instantiation node), semantically belong on the spec, so copy them 5537 -- there. It's harmless to leave them on the body as well. In fact one 5538 -- could argue that they belong in both places. 5539 5540 Citem := First (Context_Items (Body_Cunit)); 5541 while Present (Citem) loop 5542 Append (New_Copy (Citem), Context_Items (Decl_Cunit)); 5543 Next (Citem); 5544 end loop; 5545 5546 -- Propagate categorization flags on packages, so that they appear in 5547 -- the ali file for the spec of the unit. 5548 5549 if Ekind (New_Main) = E_Package then 5550 Set_Is_Pure (Old_Main, Is_Pure (New_Main)); 5551 Set_Is_Preelaborated (Old_Main, Is_Preelaborated (New_Main)); 5552 Set_Is_Remote_Types (Old_Main, Is_Remote_Types (New_Main)); 5553 Set_Is_Shared_Passive (Old_Main, Is_Shared_Passive (New_Main)); 5554 Set_Is_Remote_Call_Interface 5555 (Old_Main, Is_Remote_Call_Interface (New_Main)); 5556 end if; 5557 5558 -- Make entry in Units table, so that binder can generate call to 5559 -- elaboration procedure for body, if any. 5560 5561 Make_Instance_Unit (Body_Cunit, In_Main => True); 5562 Main_Unit_Entity := New_Main; 5563 Set_Cunit_Entity (Main_Unit, Main_Unit_Entity); 5564 5565 -- Build elaboration entity, since the instance may certainly generate 5566 -- elaboration code requiring a flag for protection. 5567 5568 Build_Elaboration_Entity (Decl_Cunit, New_Main); 5569 end Build_Instance_Compilation_Unit_Nodes; 5570 5571 ----------------------------- 5572 -- Check_Access_Definition -- 5573 ----------------------------- 5574 5575 procedure Check_Access_Definition (N : Node_Id) is 5576 begin 5577 pragma Assert 5578 (Ada_Version >= Ada_2005 and then Present (Access_Definition (N))); 5579 null; 5580 end Check_Access_Definition; 5581 5582 ----------------------------------- 5583 -- Check_Formal_Package_Instance -- 5584 ----------------------------------- 5585 5586 -- If the formal has specific parameters, they must match those of the 5587 -- actual. Both of them are instances, and the renaming declarations for 5588 -- their formal parameters appear in the same order in both. The analyzed 5589 -- formal has been analyzed in the context of the current instance. 5590 5591 procedure Check_Formal_Package_Instance 5592 (Formal_Pack : Entity_Id; 5593 Actual_Pack : Entity_Id) 5594 is 5595 E1 : Entity_Id := First_Entity (Actual_Pack); 5596 E2 : Entity_Id := First_Entity (Formal_Pack); 5597 5598 Expr1 : Node_Id; 5599 Expr2 : Node_Id; 5600 5601 procedure Check_Mismatch (B : Boolean); 5602 -- Common error routine for mismatch between the parameters of the 5603 -- actual instance and those of the formal package. 5604 5605 function Same_Instantiated_Constant (E1, E2 : Entity_Id) return Boolean; 5606 -- The formal may come from a nested formal package, and the actual may 5607 -- have been constant-folded. To determine whether the two denote the 5608 -- same entity we may have to traverse several definitions to recover 5609 -- the ultimate entity that they refer to. 5610 5611 function Same_Instantiated_Variable (E1, E2 : Entity_Id) return Boolean; 5612 -- Similarly, if the formal comes from a nested formal package, the 5613 -- actual may designate the formal through multiple renamings, which 5614 -- have to be followed to determine the original variable in question. 5615 5616 -------------------- 5617 -- Check_Mismatch -- 5618 -------------------- 5619 5620 procedure Check_Mismatch (B : Boolean) is 5621 Kind : constant Node_Kind := Nkind (Parent (E2)); 5622 5623 begin 5624 if Kind = N_Formal_Type_Declaration then 5625 return; 5626 5627 elsif Nkind_In (Kind, N_Formal_Object_Declaration, 5628 N_Formal_Package_Declaration) 5629 or else Kind in N_Formal_Subprogram_Declaration 5630 then 5631 null; 5632 5633 -- Ada 2012: If both formal and actual are incomplete types they 5634 -- are conformant. 5635 5636 elsif Is_Incomplete_Type (E1) and then Is_Incomplete_Type (E2) then 5637 null; 5638 5639 elsif B then 5640 Error_Msg_NE 5641 ("actual for & in actual instance does not match formal", 5642 Parent (Actual_Pack), E1); 5643 end if; 5644 end Check_Mismatch; 5645 5646 -------------------------------- 5647 -- Same_Instantiated_Constant -- 5648 -------------------------------- 5649 5650 function Same_Instantiated_Constant 5651 (E1, E2 : Entity_Id) return Boolean 5652 is 5653 Ent : Entity_Id; 5654 5655 begin 5656 Ent := E2; 5657 while Present (Ent) loop 5658 if E1 = Ent then 5659 return True; 5660 5661 elsif Ekind (Ent) /= E_Constant then 5662 return False; 5663 5664 elsif Is_Entity_Name (Constant_Value (Ent)) then 5665 if Entity (Constant_Value (Ent)) = E1 then 5666 return True; 5667 else 5668 Ent := Entity (Constant_Value (Ent)); 5669 end if; 5670 5671 -- The actual may be a constant that has been folded. Recover 5672 -- original name. 5673 5674 elsif Is_Entity_Name (Original_Node (Constant_Value (Ent))) then 5675 Ent := Entity (Original_Node (Constant_Value (Ent))); 5676 5677 else 5678 return False; 5679 end if; 5680 end loop; 5681 5682 return False; 5683 end Same_Instantiated_Constant; 5684 5685 -------------------------------- 5686 -- Same_Instantiated_Variable -- 5687 -------------------------------- 5688 5689 function Same_Instantiated_Variable 5690 (E1, E2 : Entity_Id) return Boolean 5691 is 5692 function Original_Entity (E : Entity_Id) return Entity_Id; 5693 -- Follow chain of renamings to the ultimate ancestor 5694 5695 --------------------- 5696 -- Original_Entity -- 5697 --------------------- 5698 5699 function Original_Entity (E : Entity_Id) return Entity_Id is 5700 Orig : Entity_Id; 5701 5702 begin 5703 Orig := E; 5704 while Nkind (Parent (Orig)) = N_Object_Renaming_Declaration 5705 and then Present (Renamed_Object (Orig)) 5706 and then Is_Entity_Name (Renamed_Object (Orig)) 5707 loop 5708 Orig := Entity (Renamed_Object (Orig)); 5709 end loop; 5710 5711 return Orig; 5712 end Original_Entity; 5713 5714 -- Start of processing for Same_Instantiated_Variable 5715 5716 begin 5717 return Ekind (E1) = Ekind (E2) 5718 and then Original_Entity (E1) = Original_Entity (E2); 5719 end Same_Instantiated_Variable; 5720 5721 -- Start of processing for Check_Formal_Package_Instance 5722 5723 begin 5724 while Present (E1) and then Present (E2) loop 5725 exit when Ekind (E1) = E_Package 5726 and then Renamed_Entity (E1) = Renamed_Entity (Actual_Pack); 5727 5728 -- If the formal is the renaming of the formal package, this 5729 -- is the end of its formal part, which may occur before the 5730 -- end of the formal part in the actual in the presence of 5731 -- defaulted parameters in the formal package. 5732 5733 exit when Nkind (Parent (E2)) = N_Package_Renaming_Declaration 5734 and then Renamed_Entity (E2) = Scope (E2); 5735 5736 -- The analysis of the actual may generate additional internal 5737 -- entities. If the formal is defaulted, there is no corresponding 5738 -- analysis and the internal entities must be skipped, until we 5739 -- find corresponding entities again. 5740 5741 if Comes_From_Source (E2) 5742 and then not Comes_From_Source (E1) 5743 and then Chars (E1) /= Chars (E2) 5744 then 5745 while Present (E1) and then Chars (E1) /= Chars (E2) loop 5746 Next_Entity (E1); 5747 end loop; 5748 end if; 5749 5750 if No (E1) then 5751 return; 5752 5753 -- If the formal entity comes from a formal declaration, it was 5754 -- defaulted in the formal package, and no check is needed on it. 5755 5756 elsif Nkind (Parent (E2)) = N_Formal_Object_Declaration then 5757 goto Next_E; 5758 5759 -- Ditto for defaulted formal subprograms. 5760 5761 elsif Is_Overloadable (E1) 5762 and then Nkind (Unit_Declaration_Node (E2)) in 5763 N_Formal_Subprogram_Declaration 5764 then 5765 goto Next_E; 5766 5767 elsif Is_Type (E1) then 5768 5769 -- Subtypes must statically match. E1, E2 are the local entities 5770 -- that are subtypes of the actuals. Itypes generated for other 5771 -- parameters need not be checked, the check will be performed 5772 -- on the parameters themselves. 5773 5774 -- If E2 is a formal type declaration, it is a defaulted parameter 5775 -- and needs no checking. 5776 5777 if not Is_Itype (E1) and then not Is_Itype (E2) then 5778 Check_Mismatch 5779 (not Is_Type (E2) 5780 or else Etype (E1) /= Etype (E2) 5781 or else not Subtypes_Statically_Match (E1, E2)); 5782 end if; 5783 5784 elsif Ekind (E1) = E_Constant then 5785 5786 -- IN parameters must denote the same static value, or the same 5787 -- constant, or the literal null. 5788 5789 Expr1 := Expression (Parent (E1)); 5790 5791 if Ekind (E2) /= E_Constant then 5792 Check_Mismatch (True); 5793 goto Next_E; 5794 else 5795 Expr2 := Expression (Parent (E2)); 5796 end if; 5797 5798 if Is_OK_Static_Expression (Expr1) then 5799 if not Is_OK_Static_Expression (Expr2) then 5800 Check_Mismatch (True); 5801 5802 elsif Is_Discrete_Type (Etype (E1)) then 5803 declare 5804 V1 : constant Uint := Expr_Value (Expr1); 5805 V2 : constant Uint := Expr_Value (Expr2); 5806 begin 5807 Check_Mismatch (V1 /= V2); 5808 end; 5809 5810 elsif Is_Real_Type (Etype (E1)) then 5811 declare 5812 V1 : constant Ureal := Expr_Value_R (Expr1); 5813 V2 : constant Ureal := Expr_Value_R (Expr2); 5814 begin 5815 Check_Mismatch (V1 /= V2); 5816 end; 5817 5818 elsif Is_String_Type (Etype (E1)) 5819 and then Nkind (Expr1) = N_String_Literal 5820 then 5821 if Nkind (Expr2) /= N_String_Literal then 5822 Check_Mismatch (True); 5823 else 5824 Check_Mismatch 5825 (not String_Equal (Strval (Expr1), Strval (Expr2))); 5826 end if; 5827 end if; 5828 5829 elsif Is_Entity_Name (Expr1) then 5830 if Is_Entity_Name (Expr2) then 5831 if Entity (Expr1) = Entity (Expr2) then 5832 null; 5833 else 5834 Check_Mismatch 5835 (not Same_Instantiated_Constant 5836 (Entity (Expr1), Entity (Expr2))); 5837 end if; 5838 5839 else 5840 Check_Mismatch (True); 5841 end if; 5842 5843 elsif Is_Entity_Name (Original_Node (Expr1)) 5844 and then Is_Entity_Name (Expr2) 5845 and then Same_Instantiated_Constant 5846 (Entity (Original_Node (Expr1)), Entity (Expr2)) 5847 then 5848 null; 5849 5850 elsif Nkind (Expr1) = N_Null then 5851 Check_Mismatch (Nkind (Expr1) /= N_Null); 5852 5853 else 5854 Check_Mismatch (True); 5855 end if; 5856 5857 elsif Ekind (E1) = E_Variable then 5858 Check_Mismatch (not Same_Instantiated_Variable (E1, E2)); 5859 5860 elsif Ekind (E1) = E_Package then 5861 Check_Mismatch 5862 (Ekind (E1) /= Ekind (E2) 5863 or else Renamed_Object (E1) /= Renamed_Object (E2)); 5864 5865 elsif Is_Overloadable (E1) then 5866 5867 -- Verify that the actual subprograms match. Note that actuals 5868 -- that are attributes are rewritten as subprograms. If the 5869 -- subprogram in the formal package is defaulted, no check is 5870 -- needed. Note that this can only happen in Ada 2005 when the 5871 -- formal package can be partially parameterized. 5872 5873 if Nkind (Unit_Declaration_Node (E1)) = 5874 N_Subprogram_Renaming_Declaration 5875 and then From_Default (Unit_Declaration_Node (E1)) 5876 then 5877 null; 5878 5879 -- If the formal package has an "others" box association that 5880 -- covers this formal, there is no need for a check either. 5881 5882 elsif Nkind (Unit_Declaration_Node (E2)) in 5883 N_Formal_Subprogram_Declaration 5884 and then Box_Present (Unit_Declaration_Node (E2)) 5885 then 5886 null; 5887 5888 -- No check needed if subprogram is a defaulted null procedure 5889 5890 elsif No (Alias (E2)) 5891 and then Ekind (E2) = E_Procedure 5892 and then 5893 Null_Present (Specification (Unit_Declaration_Node (E2))) 5894 then 5895 null; 5896 5897 -- Otherwise the actual in the formal and the actual in the 5898 -- instantiation of the formal must match, up to renamings. 5899 5900 else 5901 Check_Mismatch 5902 (Ekind (E2) /= Ekind (E1) or else (Alias (E1)) /= Alias (E2)); 5903 end if; 5904 5905 else 5906 raise Program_Error; 5907 end if; 5908 5909 <<Next_E>> 5910 Next_Entity (E1); 5911 Next_Entity (E2); 5912 end loop; 5913 end Check_Formal_Package_Instance; 5914 5915 --------------------------- 5916 -- Check_Formal_Packages -- 5917 --------------------------- 5918 5919 procedure Check_Formal_Packages (P_Id : Entity_Id) is 5920 E : Entity_Id; 5921 Formal_P : Entity_Id; 5922 5923 begin 5924 -- Iterate through the declarations in the instance, looking for package 5925 -- renaming declarations that denote instances of formal packages. Stop 5926 -- when we find the renaming of the current package itself. The 5927 -- declaration for a formal package without a box is followed by an 5928 -- internal entity that repeats the instantiation. 5929 5930 E := First_Entity (P_Id); 5931 while Present (E) loop 5932 if Ekind (E) = E_Package then 5933 if Renamed_Object (E) = P_Id then 5934 exit; 5935 5936 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then 5937 null; 5938 5939 elsif not Box_Present (Parent (Associated_Formal_Package (E))) then 5940 Formal_P := Next_Entity (E); 5941 Check_Formal_Package_Instance (Formal_P, E); 5942 5943 -- After checking, remove the internal validating package. It 5944 -- is only needed for semantic checks, and as it may contain 5945 -- generic formal declarations it should not reach gigi. 5946 5947 Remove (Unit_Declaration_Node (Formal_P)); 5948 end if; 5949 end if; 5950 5951 Next_Entity (E); 5952 end loop; 5953 end Check_Formal_Packages; 5954 5955 --------------------------------- 5956 -- Check_Forward_Instantiation -- 5957 --------------------------------- 5958 5959 procedure Check_Forward_Instantiation (Decl : Node_Id) is 5960 S : Entity_Id; 5961 Gen_Comp : Entity_Id := Cunit_Entity (Get_Source_Unit (Decl)); 5962 5963 begin 5964 -- The instantiation appears before the generic body if we are in the 5965 -- scope of the unit containing the generic, either in its spec or in 5966 -- the package body, and before the generic body. 5967 5968 if Ekind (Gen_Comp) = E_Package_Body then 5969 Gen_Comp := Spec_Entity (Gen_Comp); 5970 end if; 5971 5972 if In_Open_Scopes (Gen_Comp) 5973 and then No (Corresponding_Body (Decl)) 5974 then 5975 S := Current_Scope; 5976 5977 while Present (S) 5978 and then not Is_Compilation_Unit (S) 5979 and then not Is_Child_Unit (S) 5980 loop 5981 if Ekind (S) = E_Package then 5982 Set_Has_Forward_Instantiation (S); 5983 end if; 5984 5985 S := Scope (S); 5986 end loop; 5987 end if; 5988 end Check_Forward_Instantiation; 5989 5990 --------------------------- 5991 -- Check_Generic_Actuals -- 5992 --------------------------- 5993 5994 -- The visibility of the actuals may be different between the point of 5995 -- generic instantiation and the instantiation of the body. 5996 5997 procedure Check_Generic_Actuals 5998 (Instance : Entity_Id; 5999 Is_Formal_Box : Boolean) 6000 is 6001 E : Entity_Id; 6002 Astype : Entity_Id; 6003 6004 function Denotes_Previous_Actual (Typ : Entity_Id) return Boolean; 6005 -- For a formal that is an array type, the component type is often a 6006 -- previous formal in the same unit. The privacy status of the component 6007 -- type will have been examined earlier in the traversal of the 6008 -- corresponding actuals, and this status should not be modified for 6009 -- the array (sub)type itself. However, if the base type of the array 6010 -- (sub)type is private, its full view must be restored in the body to 6011 -- be consistent with subsequent index subtypes, etc. 6012 -- 6013 -- To detect this case we have to rescan the list of formals, which is 6014 -- usually short enough to ignore the resulting inefficiency. 6015 6016 ----------------------------- 6017 -- Denotes_Previous_Actual -- 6018 ----------------------------- 6019 6020 function Denotes_Previous_Actual (Typ : Entity_Id) return Boolean is 6021 Prev : Entity_Id; 6022 6023 begin 6024 Prev := First_Entity (Instance); 6025 while Present (Prev) loop 6026 if Is_Type (Prev) 6027 and then Nkind (Parent (Prev)) = N_Subtype_Declaration 6028 and then Is_Entity_Name (Subtype_Indication (Parent (Prev))) 6029 and then Entity (Subtype_Indication (Parent (Prev))) = Typ 6030 then 6031 return True; 6032 6033 elsif Prev = E then 6034 return False; 6035 6036 else 6037 Next_Entity (Prev); 6038 end if; 6039 end loop; 6040 6041 return False; 6042 end Denotes_Previous_Actual; 6043 6044 -- Start of processing for Check_Generic_Actuals 6045 6046 begin 6047 E := First_Entity (Instance); 6048 while Present (E) loop 6049 if Is_Type (E) 6050 and then Nkind (Parent (E)) = N_Subtype_Declaration 6051 and then Scope (Etype (E)) /= Instance 6052 and then Is_Entity_Name (Subtype_Indication (Parent (E))) 6053 then 6054 if Is_Array_Type (E) 6055 and then not Is_Private_Type (Etype (E)) 6056 and then Denotes_Previous_Actual (Component_Type (E)) 6057 then 6058 null; 6059 else 6060 Check_Private_View (Subtype_Indication (Parent (E))); 6061 end if; 6062 6063 Set_Is_Generic_Actual_Type (E, True); 6064 Set_Is_Hidden (E, False); 6065 Set_Is_Potentially_Use_Visible (E, 6066 In_Use (Instance)); 6067 6068 -- We constructed the generic actual type as a subtype of the 6069 -- supplied type. This means that it normally would not inherit 6070 -- subtype specific attributes of the actual, which is wrong for 6071 -- the generic case. 6072 6073 Astype := Ancestor_Subtype (E); 6074 6075 if No (Astype) then 6076 6077 -- This can happen when E is an itype that is the full view of 6078 -- a private type completed, e.g. with a constrained array. In 6079 -- that case, use the first subtype, which will carry size 6080 -- information. The base type itself is unconstrained and will 6081 -- not carry it. 6082 6083 Astype := First_Subtype (E); 6084 end if; 6085 6086 Set_Size_Info (E, (Astype)); 6087 Set_RM_Size (E, RM_Size (Astype)); 6088 Set_First_Rep_Item (E, First_Rep_Item (Astype)); 6089 6090 if Is_Discrete_Or_Fixed_Point_Type (E) then 6091 Set_RM_Size (E, RM_Size (Astype)); 6092 6093 -- In nested instances, the base type of an access actual may 6094 -- itself be private, and need to be exchanged. 6095 6096 elsif Is_Access_Type (E) 6097 and then Is_Private_Type (Etype (E)) 6098 then 6099 Check_Private_View 6100 (New_Occurrence_Of (Etype (E), Sloc (Instance))); 6101 end if; 6102 6103 elsif Ekind (E) = E_Package then 6104 6105 -- If this is the renaming for the current instance, we're done. 6106 -- Otherwise it is a formal package. If the corresponding formal 6107 -- was declared with a box, the (instantiations of the) generic 6108 -- formal part are also visible. Otherwise, ignore the entity 6109 -- created to validate the actuals. 6110 6111 if Renamed_Object (E) = Instance then 6112 exit; 6113 6114 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then 6115 null; 6116 6117 -- The visibility of a formal of an enclosing generic is already 6118 -- correct. 6119 6120 elsif Denotes_Formal_Package (E) then 6121 null; 6122 6123 elsif Present (Associated_Formal_Package (E)) 6124 and then not Is_Generic_Formal (E) 6125 then 6126 if Box_Present (Parent (Associated_Formal_Package (E))) then 6127 Check_Generic_Actuals (Renamed_Object (E), True); 6128 6129 else 6130 Check_Generic_Actuals (Renamed_Object (E), False); 6131 end if; 6132 6133 Set_Is_Hidden (E, False); 6134 end if; 6135 6136 -- If this is a subprogram instance (in a wrapper package) the 6137 -- actual is fully visible. 6138 6139 elsif Is_Wrapper_Package (Instance) then 6140 Set_Is_Hidden (E, False); 6141 6142 -- If the formal package is declared with a box, or if the formal 6143 -- parameter is defaulted, it is visible in the body. 6144 6145 elsif Is_Formal_Box or else Is_Visible_Formal (E) then 6146 Set_Is_Hidden (E, False); 6147 end if; 6148 6149 if Ekind (E) = E_Constant then 6150 6151 -- If the type of the actual is a private type declared in the 6152 -- enclosing scope of the generic unit, the body of the generic 6153 -- sees the full view of the type (because it has to appear in 6154 -- the corresponding package body). If the type is private now, 6155 -- exchange views to restore the proper visiblity in the instance. 6156 6157 declare 6158 Typ : constant Entity_Id := Base_Type (Etype (E)); 6159 -- The type of the actual 6160 6161 Gen_Id : Entity_Id; 6162 -- The generic unit 6163 6164 Parent_Scope : Entity_Id; 6165 -- The enclosing scope of the generic unit 6166 6167 begin 6168 if Is_Wrapper_Package (Instance) then 6169 Gen_Id := 6170 Generic_Parent 6171 (Specification 6172 (Unit_Declaration_Node 6173 (Related_Instance (Instance)))); 6174 else 6175 Gen_Id := 6176 Generic_Parent (Package_Specification (Instance)); 6177 end if; 6178 6179 Parent_Scope := Scope (Gen_Id); 6180 6181 -- The exchange is only needed if the generic is defined 6182 -- within a package which is not a common ancestor of the 6183 -- scope of the instance, and is not already in scope. 6184 6185 if Is_Private_Type (Typ) 6186 and then Scope (Typ) = Parent_Scope 6187 and then Scope (Instance) /= Parent_Scope 6188 and then Ekind (Parent_Scope) = E_Package 6189 and then not Is_Child_Unit (Gen_Id) 6190 then 6191 Switch_View (Typ); 6192 6193 -- If the type of the entity is a subtype, it may also have 6194 -- to be made visible, together with the base type of its 6195 -- full view, after exchange. 6196 6197 if Is_Private_Type (Etype (E)) then 6198 Switch_View (Etype (E)); 6199 Switch_View (Base_Type (Etype (E))); 6200 end if; 6201 end if; 6202 end; 6203 end if; 6204 6205 Next_Entity (E); 6206 end loop; 6207 end Check_Generic_Actuals; 6208 6209 ------------------------------ 6210 -- Check_Generic_Child_Unit -- 6211 ------------------------------ 6212 6213 procedure Check_Generic_Child_Unit 6214 (Gen_Id : Node_Id; 6215 Parent_Installed : in out Boolean) 6216 is 6217 Loc : constant Source_Ptr := Sloc (Gen_Id); 6218 Gen_Par : Entity_Id := Empty; 6219 E : Entity_Id; 6220 Inst_Par : Entity_Id; 6221 S : Node_Id; 6222 6223 function Find_Generic_Child 6224 (Scop : Entity_Id; 6225 Id : Node_Id) return Entity_Id; 6226 -- Search generic parent for possible child unit with the given name 6227 6228 function In_Enclosing_Instance return Boolean; 6229 -- Within an instance of the parent, the child unit may be denoted by 6230 -- a simple name, or an abbreviated expanded name. Examine enclosing 6231 -- scopes to locate a possible parent instantiation. 6232 6233 ------------------------ 6234 -- Find_Generic_Child -- 6235 ------------------------ 6236 6237 function Find_Generic_Child 6238 (Scop : Entity_Id; 6239 Id : Node_Id) return Entity_Id 6240 is 6241 E : Entity_Id; 6242 6243 begin 6244 -- If entity of name is already set, instance has already been 6245 -- resolved, e.g. in an enclosing instantiation. 6246 6247 if Present (Entity (Id)) then 6248 if Scope (Entity (Id)) = Scop then 6249 return Entity (Id); 6250 else 6251 return Empty; 6252 end if; 6253 6254 else 6255 E := First_Entity (Scop); 6256 while Present (E) loop 6257 if Chars (E) = Chars (Id) 6258 and then Is_Child_Unit (E) 6259 then 6260 if Is_Child_Unit (E) 6261 and then not Is_Visible_Lib_Unit (E) 6262 then 6263 Error_Msg_NE 6264 ("generic child unit& is not visible", Gen_Id, E); 6265 end if; 6266 6267 Set_Entity (Id, E); 6268 return E; 6269 end if; 6270 6271 Next_Entity (E); 6272 end loop; 6273 6274 return Empty; 6275 end if; 6276 end Find_Generic_Child; 6277 6278 --------------------------- 6279 -- In_Enclosing_Instance -- 6280 --------------------------- 6281 6282 function In_Enclosing_Instance return Boolean is 6283 Enclosing_Instance : Node_Id; 6284 Instance_Decl : Node_Id; 6285 6286 begin 6287 -- We do not inline any call that contains instantiations, except 6288 -- for instantiations of Unchecked_Conversion, so if we are within 6289 -- an inlined body the current instance does not require parents. 6290 6291 if In_Inlined_Body then 6292 pragma Assert (Chars (Gen_Id) = Name_Unchecked_Conversion); 6293 return False; 6294 end if; 6295 6296 -- Loop to check enclosing scopes 6297 6298 Enclosing_Instance := Current_Scope; 6299 while Present (Enclosing_Instance) loop 6300 Instance_Decl := Unit_Declaration_Node (Enclosing_Instance); 6301 6302 if Ekind (Enclosing_Instance) = E_Package 6303 and then Is_Generic_Instance (Enclosing_Instance) 6304 and then Present 6305 (Generic_Parent (Specification (Instance_Decl))) 6306 then 6307 -- Check whether the generic we are looking for is a child of 6308 -- this instance. 6309 6310 E := Find_Generic_Child 6311 (Generic_Parent (Specification (Instance_Decl)), Gen_Id); 6312 exit when Present (E); 6313 6314 else 6315 E := Empty; 6316 end if; 6317 6318 Enclosing_Instance := Scope (Enclosing_Instance); 6319 end loop; 6320 6321 if No (E) then 6322 6323 -- Not a child unit 6324 6325 Analyze (Gen_Id); 6326 return False; 6327 6328 else 6329 Rewrite (Gen_Id, 6330 Make_Expanded_Name (Loc, 6331 Chars => Chars (E), 6332 Prefix => New_Occurrence_Of (Enclosing_Instance, Loc), 6333 Selector_Name => New_Occurrence_Of (E, Loc))); 6334 6335 Set_Entity (Gen_Id, E); 6336 Set_Etype (Gen_Id, Etype (E)); 6337 Parent_Installed := False; -- Already in scope. 6338 return True; 6339 end if; 6340 end In_Enclosing_Instance; 6341 6342 -- Start of processing for Check_Generic_Child_Unit 6343 6344 begin 6345 -- If the name of the generic is given by a selected component, it may 6346 -- be the name of a generic child unit, and the prefix is the name of an 6347 -- instance of the parent, in which case the child unit must be visible. 6348 -- If this instance is not in scope, it must be placed there and removed 6349 -- after instantiation, because what is being instantiated is not the 6350 -- original child, but the corresponding child present in the instance 6351 -- of the parent. 6352 6353 -- If the child is instantiated within the parent, it can be given by 6354 -- a simple name. In this case the instance is already in scope, but 6355 -- the child generic must be recovered from the generic parent as well. 6356 6357 if Nkind (Gen_Id) = N_Selected_Component then 6358 S := Selector_Name (Gen_Id); 6359 Analyze (Prefix (Gen_Id)); 6360 Inst_Par := Entity (Prefix (Gen_Id)); 6361 6362 if Ekind (Inst_Par) = E_Package 6363 and then Present (Renamed_Object (Inst_Par)) 6364 then 6365 Inst_Par := Renamed_Object (Inst_Par); 6366 end if; 6367 6368 if Ekind (Inst_Par) = E_Package then 6369 if Nkind (Parent (Inst_Par)) = N_Package_Specification then 6370 Gen_Par := Generic_Parent (Parent (Inst_Par)); 6371 6372 elsif Nkind (Parent (Inst_Par)) = N_Defining_Program_Unit_Name 6373 and then 6374 Nkind (Parent (Parent (Inst_Par))) = N_Package_Specification 6375 then 6376 Gen_Par := Generic_Parent (Parent (Parent (Inst_Par))); 6377 end if; 6378 6379 elsif Ekind (Inst_Par) = E_Generic_Package 6380 and then Nkind (Parent (Gen_Id)) = N_Formal_Package_Declaration 6381 then 6382 -- A formal package may be a real child package, and not the 6383 -- implicit instance within a parent. In this case the child is 6384 -- not visible and has to be retrieved explicitly as well. 6385 6386 Gen_Par := Inst_Par; 6387 end if; 6388 6389 if Present (Gen_Par) then 6390 6391 -- The prefix denotes an instantiation. The entity itself may be a 6392 -- nested generic, or a child unit. 6393 6394 E := Find_Generic_Child (Gen_Par, S); 6395 6396 if Present (E) then 6397 Change_Selected_Component_To_Expanded_Name (Gen_Id); 6398 Set_Entity (Gen_Id, E); 6399 Set_Etype (Gen_Id, Etype (E)); 6400 Set_Entity (S, E); 6401 Set_Etype (S, Etype (E)); 6402 6403 -- Indicate that this is a reference to the parent 6404 6405 if In_Extended_Main_Source_Unit (Gen_Id) then 6406 Set_Is_Instantiated (Inst_Par); 6407 end if; 6408 6409 -- A common mistake is to replicate the naming scheme of a 6410 -- hierarchy by instantiating a generic child directly, rather 6411 -- than the implicit child in a parent instance: 6412 6413 -- generic .. package Gpar is .. 6414 -- generic .. package Gpar.Child is .. 6415 -- package Par is new Gpar (); 6416 6417 -- with Gpar.Child; 6418 -- package Par.Child is new Gpar.Child (); 6419 -- rather than Par.Child 6420 6421 -- In this case the instantiation is within Par, which is an 6422 -- instance, but Gpar does not denote Par because we are not IN 6423 -- the instance of Gpar, so this is illegal. The test below 6424 -- recognizes this particular case. 6425 6426 if Is_Child_Unit (E) 6427 and then not Comes_From_Source (Entity (Prefix (Gen_Id))) 6428 and then (not In_Instance 6429 or else Nkind (Parent (Parent (Gen_Id))) = 6430 N_Compilation_Unit) 6431 then 6432 Error_Msg_N 6433 ("prefix of generic child unit must be instance of parent", 6434 Gen_Id); 6435 end if; 6436 6437 if not In_Open_Scopes (Inst_Par) 6438 and then Nkind (Parent (Gen_Id)) not in 6439 N_Generic_Renaming_Declaration 6440 then 6441 Install_Parent (Inst_Par); 6442 Parent_Installed := True; 6443 6444 elsif In_Open_Scopes (Inst_Par) then 6445 6446 -- If the parent is already installed, install the actuals 6447 -- for its formal packages. This is necessary when the child 6448 -- instance is a child of the parent instance: in this case, 6449 -- the parent is placed on the scope stack but the formal 6450 -- packages are not made visible. 6451 6452 Install_Formal_Packages (Inst_Par); 6453 end if; 6454 6455 else 6456 -- If the generic parent does not contain an entity that 6457 -- corresponds to the selector, the instance doesn't either. 6458 -- Analyzing the node will yield the appropriate error message. 6459 -- If the entity is not a child unit, then it is an inner 6460 -- generic in the parent. 6461 6462 Analyze (Gen_Id); 6463 end if; 6464 6465 else 6466 Analyze (Gen_Id); 6467 6468 if Is_Child_Unit (Entity (Gen_Id)) 6469 and then 6470 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration 6471 and then not In_Open_Scopes (Inst_Par) 6472 then 6473 Install_Parent (Inst_Par); 6474 Parent_Installed := True; 6475 6476 -- The generic unit may be the renaming of the implicit child 6477 -- present in an instance. In that case the parent instance is 6478 -- obtained from the name of the renamed entity. 6479 6480 elsif Ekind (Entity (Gen_Id)) = E_Generic_Package 6481 and then Present (Renamed_Entity (Entity (Gen_Id))) 6482 and then Is_Child_Unit (Renamed_Entity (Entity (Gen_Id))) 6483 then 6484 declare 6485 Renamed_Package : constant Node_Id := 6486 Name (Parent (Entity (Gen_Id))); 6487 begin 6488 if Nkind (Renamed_Package) = N_Expanded_Name then 6489 Inst_Par := Entity (Prefix (Renamed_Package)); 6490 Install_Parent (Inst_Par); 6491 Parent_Installed := True; 6492 end if; 6493 end; 6494 end if; 6495 end if; 6496 6497 elsif Nkind (Gen_Id) = N_Expanded_Name then 6498 6499 -- Entity already present, analyze prefix, whose meaning may be 6500 -- an instance in the current context. If it is an instance of 6501 -- a relative within another, the proper parent may still have 6502 -- to be installed, if they are not of the same generation. 6503 6504 Analyze (Prefix (Gen_Id)); 6505 6506 -- In the unlikely case that a local declaration hides the name 6507 -- of the parent package, locate it on the homonym chain. If the 6508 -- context is an instance of the parent, the renaming entity is 6509 -- flagged as such. 6510 6511 Inst_Par := Entity (Prefix (Gen_Id)); 6512 while Present (Inst_Par) 6513 and then not Is_Package_Or_Generic_Package (Inst_Par) 6514 loop 6515 Inst_Par := Homonym (Inst_Par); 6516 end loop; 6517 6518 pragma Assert (Present (Inst_Par)); 6519 Set_Entity (Prefix (Gen_Id), Inst_Par); 6520 6521 if In_Enclosing_Instance then 6522 null; 6523 6524 elsif Present (Entity (Gen_Id)) 6525 and then Is_Child_Unit (Entity (Gen_Id)) 6526 and then not In_Open_Scopes (Inst_Par) 6527 then 6528 Install_Parent (Inst_Par); 6529 Parent_Installed := True; 6530 end if; 6531 6532 elsif In_Enclosing_Instance then 6533 6534 -- The child unit is found in some enclosing scope 6535 6536 null; 6537 6538 else 6539 Analyze (Gen_Id); 6540 6541 -- If this is the renaming of the implicit child in a parent 6542 -- instance, recover the parent name and install it. 6543 6544 if Is_Entity_Name (Gen_Id) then 6545 E := Entity (Gen_Id); 6546 6547 if Is_Generic_Unit (E) 6548 and then Nkind (Parent (E)) in N_Generic_Renaming_Declaration 6549 and then Is_Child_Unit (Renamed_Object (E)) 6550 and then Is_Generic_Unit (Scope (Renamed_Object (E))) 6551 and then Nkind (Name (Parent (E))) = N_Expanded_Name 6552 then 6553 Rewrite (Gen_Id, New_Copy_Tree (Name (Parent (E)))); 6554 Inst_Par := Entity (Prefix (Gen_Id)); 6555 6556 if not In_Open_Scopes (Inst_Par) then 6557 Install_Parent (Inst_Par); 6558 Parent_Installed := True; 6559 end if; 6560 6561 -- If it is a child unit of a non-generic parent, it may be 6562 -- use-visible and given by a direct name. Install parent as 6563 -- for other cases. 6564 6565 elsif Is_Generic_Unit (E) 6566 and then Is_Child_Unit (E) 6567 and then 6568 Nkind (Parent (Gen_Id)) not in N_Generic_Renaming_Declaration 6569 and then not Is_Generic_Unit (Scope (E)) 6570 then 6571 if not In_Open_Scopes (Scope (E)) then 6572 Install_Parent (Scope (E)); 6573 Parent_Installed := True; 6574 end if; 6575 end if; 6576 end if; 6577 end if; 6578 end Check_Generic_Child_Unit; 6579 6580 ----------------------------- 6581 -- Check_Hidden_Child_Unit -- 6582 ----------------------------- 6583 6584 procedure Check_Hidden_Child_Unit 6585 (N : Node_Id; 6586 Gen_Unit : Entity_Id; 6587 Act_Decl_Id : Entity_Id) 6588 is 6589 Gen_Id : constant Node_Id := Name (N); 6590 6591 begin 6592 if Is_Child_Unit (Gen_Unit) 6593 and then Is_Child_Unit (Act_Decl_Id) 6594 and then Nkind (Gen_Id) = N_Expanded_Name 6595 and then Entity (Prefix (Gen_Id)) = Scope (Act_Decl_Id) 6596 and then Chars (Gen_Unit) = Chars (Act_Decl_Id) 6597 then 6598 Error_Msg_Node_2 := Scope (Act_Decl_Id); 6599 Error_Msg_NE 6600 ("generic unit & is implicitly declared in &", 6601 Defining_Unit_Name (N), Gen_Unit); 6602 Error_Msg_N ("\instance must have different name", 6603 Defining_Unit_Name (N)); 6604 end if; 6605 end Check_Hidden_Child_Unit; 6606 6607 ------------------------ 6608 -- Check_Private_View -- 6609 ------------------------ 6610 6611 procedure Check_Private_View (N : Node_Id) is 6612 T : constant Entity_Id := Etype (N); 6613 BT : Entity_Id; 6614 6615 begin 6616 -- Exchange views if the type was not private in the generic but is 6617 -- private at the point of instantiation. Do not exchange views if 6618 -- the scope of the type is in scope. This can happen if both generic 6619 -- and instance are sibling units, or if type is defined in a parent. 6620 -- In this case the visibility of the type will be correct for all 6621 -- semantic checks. 6622 6623 if Present (T) then 6624 BT := Base_Type (T); 6625 6626 if Is_Private_Type (T) 6627 and then not Has_Private_View (N) 6628 and then Present (Full_View (T)) 6629 and then not In_Open_Scopes (Scope (T)) 6630 then 6631 -- In the generic, the full type was visible. Save the private 6632 -- entity, for subsequent exchange. 6633 6634 Switch_View (T); 6635 6636 elsif Has_Private_View (N) 6637 and then not Is_Private_Type (T) 6638 and then not Has_Been_Exchanged (T) 6639 and then Etype (Get_Associated_Node (N)) /= T 6640 then 6641 -- Only the private declaration was visible in the generic. If 6642 -- the type appears in a subtype declaration, the subtype in the 6643 -- instance must have a view compatible with that of its parent, 6644 -- which must be exchanged (see corresponding code in Restore_ 6645 -- Private_Views). Otherwise, if the type is defined in a parent 6646 -- unit, leave full visibility within instance, which is safe. 6647 6648 if In_Open_Scopes (Scope (Base_Type (T))) 6649 and then not Is_Private_Type (Base_Type (T)) 6650 and then Comes_From_Source (Base_Type (T)) 6651 then 6652 null; 6653 6654 elsif Nkind (Parent (N)) = N_Subtype_Declaration 6655 or else not In_Private_Part (Scope (Base_Type (T))) 6656 then 6657 Prepend_Elmt (T, Exchanged_Views); 6658 Exchange_Declarations (Etype (Get_Associated_Node (N))); 6659 end if; 6660 6661 -- For composite types with inconsistent representation exchange 6662 -- component types accordingly. 6663 6664 elsif Is_Access_Type (T) 6665 and then Is_Private_Type (Designated_Type (T)) 6666 and then not Has_Private_View (N) 6667 and then Present (Full_View (Designated_Type (T))) 6668 then 6669 Switch_View (Designated_Type (T)); 6670 6671 elsif Is_Array_Type (T) then 6672 if Is_Private_Type (Component_Type (T)) 6673 and then not Has_Private_View (N) 6674 and then Present (Full_View (Component_Type (T))) 6675 then 6676 Switch_View (Component_Type (T)); 6677 end if; 6678 6679 -- The normal exchange mechanism relies on the setting of a 6680 -- flag on the reference in the generic. However, an additional 6681 -- mechanism is needed for types that are not explicitly 6682 -- mentioned in the generic, but may be needed in expanded code 6683 -- in the instance. This includes component types of arrays and 6684 -- designated types of access types. This processing must also 6685 -- include the index types of arrays which we take care of here. 6686 6687 declare 6688 Indx : Node_Id; 6689 Typ : Entity_Id; 6690 6691 begin 6692 Indx := First_Index (T); 6693 while Present (Indx) loop 6694 Typ := Base_Type (Etype (Indx)); 6695 6696 if Is_Private_Type (Typ) 6697 and then Present (Full_View (Typ)) 6698 then 6699 Switch_View (Typ); 6700 end if; 6701 6702 Next_Index (Indx); 6703 end loop; 6704 end; 6705 6706 elsif Is_Private_Type (T) 6707 and then Present (Full_View (T)) 6708 and then Is_Array_Type (Full_View (T)) 6709 and then Is_Private_Type (Component_Type (Full_View (T))) 6710 then 6711 Switch_View (T); 6712 6713 -- Finally, a non-private subtype may have a private base type, which 6714 -- must be exchanged for consistency. This can happen when a package 6715 -- body is instantiated, when the scope stack is empty but in fact 6716 -- the subtype and the base type are declared in an enclosing scope. 6717 6718 -- Note that in this case we introduce an inconsistency in the view 6719 -- set, because we switch the base type BT, but there could be some 6720 -- private dependent subtypes of BT which remain unswitched. Such 6721 -- subtypes might need to be switched at a later point (see specific 6722 -- provision for that case in Switch_View). 6723 6724 elsif not Is_Private_Type (T) 6725 and then not Has_Private_View (N) 6726 and then Is_Private_Type (BT) 6727 and then Present (Full_View (BT)) 6728 and then not Is_Generic_Type (BT) 6729 and then not In_Open_Scopes (BT) 6730 then 6731 Prepend_Elmt (Full_View (BT), Exchanged_Views); 6732 Exchange_Declarations (BT); 6733 end if; 6734 end if; 6735 end Check_Private_View; 6736 6737 ----------------------------- 6738 -- Check_Hidden_Primitives -- 6739 ----------------------------- 6740 6741 function Check_Hidden_Primitives (Assoc_List : List_Id) return Elist_Id is 6742 Actual : Node_Id; 6743 Gen_T : Entity_Id; 6744 Result : Elist_Id := No_Elist; 6745 6746 begin 6747 if No (Assoc_List) then 6748 return No_Elist; 6749 end if; 6750 6751 -- Traverse the list of associations between formals and actuals 6752 -- searching for renamings of tagged types 6753 6754 Actual := First (Assoc_List); 6755 while Present (Actual) loop 6756 if Nkind (Actual) = N_Subtype_Declaration then 6757 Gen_T := Generic_Parent_Type (Actual); 6758 6759 if Present (Gen_T) and then Is_Tagged_Type (Gen_T) then 6760 6761 -- Traverse the list of primitives of the actual types 6762 -- searching for hidden primitives that are visible in the 6763 -- corresponding generic formal; leave them visible and 6764 -- append them to Result to restore their decoration later. 6765 6766 Install_Hidden_Primitives 6767 (Prims_List => Result, 6768 Gen_T => Gen_T, 6769 Act_T => Entity (Subtype_Indication (Actual))); 6770 end if; 6771 end if; 6772 6773 Next (Actual); 6774 end loop; 6775 6776 return Result; 6777 end Check_Hidden_Primitives; 6778 6779 -------------------------- 6780 -- Contains_Instance_Of -- 6781 -------------------------- 6782 6783 function Contains_Instance_Of 6784 (Inner : Entity_Id; 6785 Outer : Entity_Id; 6786 N : Node_Id) return Boolean 6787 is 6788 Elmt : Elmt_Id; 6789 Scop : Entity_Id; 6790 6791 begin 6792 Scop := Outer; 6793 6794 -- Verify that there are no circular instantiations. We check whether 6795 -- the unit contains an instance of the current scope or some enclosing 6796 -- scope (in case one of the instances appears in a subunit). Longer 6797 -- circularities involving subunits might seem too pathological to 6798 -- consider, but they were not too pathological for the authors of 6799 -- DEC bc30vsq, so we loop over all enclosing scopes, and mark all 6800 -- enclosing generic scopes as containing an instance. 6801 6802 loop 6803 -- Within a generic subprogram body, the scope is not generic, to 6804 -- allow for recursive subprograms. Use the declaration to determine 6805 -- whether this is a generic unit. 6806 6807 if Ekind (Scop) = E_Generic_Package 6808 or else (Is_Subprogram (Scop) 6809 and then Nkind (Unit_Declaration_Node (Scop)) = 6810 N_Generic_Subprogram_Declaration) 6811 then 6812 Elmt := First_Elmt (Inner_Instances (Inner)); 6813 6814 while Present (Elmt) loop 6815 if Node (Elmt) = Scop then 6816 Error_Msg_Node_2 := Inner; 6817 Error_Msg_NE 6818 ("circular Instantiation: & instantiated within &!", 6819 N, Scop); 6820 return True; 6821 6822 elsif Node (Elmt) = Inner then 6823 return True; 6824 6825 elsif Contains_Instance_Of (Node (Elmt), Scop, N) then 6826 Error_Msg_Node_2 := Inner; 6827 Error_Msg_NE 6828 ("circular Instantiation: & instantiated within &!", 6829 N, Node (Elmt)); 6830 return True; 6831 end if; 6832 6833 Next_Elmt (Elmt); 6834 end loop; 6835 6836 -- Indicate that Inner is being instantiated within Scop 6837 6838 Append_Elmt (Inner, Inner_Instances (Scop)); 6839 end if; 6840 6841 if Scop = Standard_Standard then 6842 exit; 6843 else 6844 Scop := Scope (Scop); 6845 end if; 6846 end loop; 6847 6848 return False; 6849 end Contains_Instance_Of; 6850 6851 ----------------------- 6852 -- Copy_Generic_Node -- 6853 ----------------------- 6854 6855 function Copy_Generic_Node 6856 (N : Node_Id; 6857 Parent_Id : Node_Id; 6858 Instantiating : Boolean) return Node_Id 6859 is 6860 Ent : Entity_Id; 6861 New_N : Node_Id; 6862 6863 function Copy_Generic_Descendant (D : Union_Id) return Union_Id; 6864 -- Check the given value of one of the Fields referenced by the current 6865 -- node to determine whether to copy it recursively. The field may hold 6866 -- a Node_Id, a List_Id, or an Elist_Id, or a plain value (Sloc, Uint, 6867 -- Char) in which case it need not be copied. 6868 6869 procedure Copy_Descendants; 6870 -- Common utility for various nodes 6871 6872 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id; 6873 -- Make copy of element list 6874 6875 function Copy_Generic_List 6876 (L : List_Id; 6877 Parent_Id : Node_Id) return List_Id; 6878 -- Apply Copy_Node recursively to the members of a node list 6879 6880 function In_Defining_Unit_Name (Nam : Node_Id) return Boolean; 6881 -- True if an identifier is part of the defining program unit name of 6882 -- a child unit. The entity of such an identifier must be kept (for 6883 -- ASIS use) even though as the name of an enclosing generic it would 6884 -- otherwise not be preserved in the generic tree. 6885 6886 ---------------------- 6887 -- Copy_Descendants -- 6888 ---------------------- 6889 6890 procedure Copy_Descendants is 6891 6892 use Atree.Unchecked_Access; 6893 -- This code section is part of the implementation of an untyped 6894 -- tree traversal, so it needs direct access to node fields. 6895 6896 begin 6897 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N))); 6898 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N))); 6899 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N))); 6900 Set_Field4 (New_N, Copy_Generic_Descendant (Field4 (N))); 6901 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N))); 6902 end Copy_Descendants; 6903 6904 ----------------------------- 6905 -- Copy_Generic_Descendant -- 6906 ----------------------------- 6907 6908 function Copy_Generic_Descendant (D : Union_Id) return Union_Id is 6909 begin 6910 if D = Union_Id (Empty) then 6911 return D; 6912 6913 elsif D in Node_Range then 6914 return Union_Id 6915 (Copy_Generic_Node (Node_Id (D), New_N, Instantiating)); 6916 6917 elsif D in List_Range then 6918 return Union_Id (Copy_Generic_List (List_Id (D), New_N)); 6919 6920 elsif D in Elist_Range then 6921 return Union_Id (Copy_Generic_Elist (Elist_Id (D))); 6922 6923 -- Nothing else is copyable (e.g. Uint values), return as is 6924 6925 else 6926 return D; 6927 end if; 6928 end Copy_Generic_Descendant; 6929 6930 ------------------------ 6931 -- Copy_Generic_Elist -- 6932 ------------------------ 6933 6934 function Copy_Generic_Elist (E : Elist_Id) return Elist_Id is 6935 M : Elmt_Id; 6936 L : Elist_Id; 6937 6938 begin 6939 if Present (E) then 6940 L := New_Elmt_List; 6941 M := First_Elmt (E); 6942 while Present (M) loop 6943 Append_Elmt 6944 (Copy_Generic_Node (Node (M), Empty, Instantiating), L); 6945 Next_Elmt (M); 6946 end loop; 6947 6948 return L; 6949 6950 else 6951 return No_Elist; 6952 end if; 6953 end Copy_Generic_Elist; 6954 6955 ----------------------- 6956 -- Copy_Generic_List -- 6957 ----------------------- 6958 6959 function Copy_Generic_List 6960 (L : List_Id; 6961 Parent_Id : Node_Id) return List_Id 6962 is 6963 N : Node_Id; 6964 New_L : List_Id; 6965 6966 begin 6967 if Present (L) then 6968 New_L := New_List; 6969 Set_Parent (New_L, Parent_Id); 6970 6971 N := First (L); 6972 while Present (N) loop 6973 Append (Copy_Generic_Node (N, Empty, Instantiating), New_L); 6974 Next (N); 6975 end loop; 6976 6977 return New_L; 6978 6979 else 6980 return No_List; 6981 end if; 6982 end Copy_Generic_List; 6983 6984 --------------------------- 6985 -- In_Defining_Unit_Name -- 6986 --------------------------- 6987 6988 function In_Defining_Unit_Name (Nam : Node_Id) return Boolean is 6989 begin 6990 return Present (Parent (Nam)) 6991 and then (Nkind (Parent (Nam)) = N_Defining_Program_Unit_Name 6992 or else 6993 (Nkind (Parent (Nam)) = N_Expanded_Name 6994 and then In_Defining_Unit_Name (Parent (Nam)))); 6995 end In_Defining_Unit_Name; 6996 6997 -- Start of processing for Copy_Generic_Node 6998 6999 begin 7000 if N = Empty then 7001 return N; 7002 end if; 7003 7004 New_N := New_Copy (N); 7005 7006 -- Copy aspects if present 7007 7008 if Has_Aspects (N) then 7009 Set_Has_Aspects (New_N, False); 7010 Set_Aspect_Specifications 7011 (New_N, Copy_Generic_List (Aspect_Specifications (N), Parent_Id)); 7012 end if; 7013 7014 if Instantiating then 7015 Adjust_Instantiation_Sloc (New_N, S_Adjustment); 7016 end if; 7017 7018 if not Is_List_Member (N) then 7019 Set_Parent (New_N, Parent_Id); 7020 end if; 7021 7022 -- If defining identifier, then all fields have been copied already 7023 7024 if Nkind (New_N) in N_Entity then 7025 null; 7026 7027 -- Special casing for identifiers and other entity names and operators 7028 7029 elsif Nkind_In (New_N, N_Identifier, 7030 N_Character_Literal, 7031 N_Expanded_Name, 7032 N_Operator_Symbol) 7033 or else Nkind (New_N) in N_Op 7034 then 7035 if not Instantiating then 7036 7037 -- Link both nodes in order to assign subsequently the entity of 7038 -- the copy to the original node, in case this is a global 7039 -- reference. 7040 7041 Set_Associated_Node (N, New_N); 7042 7043 -- If we are within an instantiation, this is a nested generic 7044 -- that has already been analyzed at the point of definition. 7045 -- We must preserve references that were global to the enclosing 7046 -- parent at that point. Other occurrences, whether global or 7047 -- local to the current generic, must be resolved anew, so we 7048 -- reset the entity in the generic copy. A global reference has a 7049 -- smaller depth than the parent, or else the same depth in case 7050 -- both are distinct compilation units. 7051 7052 -- A child unit is implicitly declared within the enclosing parent 7053 -- but is in fact global to it, and must be preserved. 7054 7055 -- It is also possible for Current_Instantiated_Parent to be 7056 -- defined, and for this not to be a nested generic, namely if 7057 -- the unit is loaded through Rtsfind. In that case, the entity of 7058 -- New_N is only a link to the associated node, and not a defining 7059 -- occurrence. 7060 7061 -- The entities for parent units in the defining_program_unit of a 7062 -- generic child unit are established when the context of the unit 7063 -- is first analyzed, before the generic copy is made. They are 7064 -- preserved in the copy for use in ASIS queries. 7065 7066 Ent := Entity (New_N); 7067 7068 if No (Current_Instantiated_Parent.Gen_Id) then 7069 if No (Ent) 7070 or else Nkind (Ent) /= N_Defining_Identifier 7071 or else not In_Defining_Unit_Name (N) 7072 then 7073 Set_Associated_Node (New_N, Empty); 7074 end if; 7075 7076 elsif No (Ent) 7077 or else 7078 not Nkind_In (Ent, N_Defining_Identifier, 7079 N_Defining_Character_Literal, 7080 N_Defining_Operator_Symbol) 7081 or else No (Scope (Ent)) 7082 or else 7083 (Scope (Ent) = Current_Instantiated_Parent.Gen_Id 7084 and then not Is_Child_Unit (Ent)) 7085 or else 7086 (Scope_Depth (Scope (Ent)) > 7087 Scope_Depth (Current_Instantiated_Parent.Gen_Id) 7088 and then 7089 Get_Source_Unit (Ent) = 7090 Get_Source_Unit (Current_Instantiated_Parent.Gen_Id)) 7091 then 7092 Set_Associated_Node (New_N, Empty); 7093 end if; 7094 7095 -- Case of instantiating identifier or some other name or operator 7096 7097 else 7098 -- If the associated node is still defined, the entity in it 7099 -- is global, and must be copied to the instance. If this copy 7100 -- is being made for a body to inline, it is applied to an 7101 -- instantiated tree, and the entity is already present and 7102 -- must be also preserved. 7103 7104 declare 7105 Assoc : constant Node_Id := Get_Associated_Node (N); 7106 7107 begin 7108 if Present (Assoc) then 7109 if Nkind (Assoc) = Nkind (N) then 7110 Set_Entity (New_N, Entity (Assoc)); 7111 Check_Private_View (N); 7112 7113 -- The name in the call may be a selected component if the 7114 -- call has not been analyzed yet, as may be the case for 7115 -- pre/post conditions in a generic unit. 7116 7117 elsif Nkind (Assoc) = N_Function_Call 7118 and then Is_Entity_Name (Name (Assoc)) 7119 then 7120 Set_Entity (New_N, Entity (Name (Assoc))); 7121 7122 elsif Nkind_In (Assoc, N_Defining_Identifier, 7123 N_Defining_Character_Literal, 7124 N_Defining_Operator_Symbol) 7125 and then Expander_Active 7126 then 7127 -- Inlining case: we are copying a tree that contains 7128 -- global entities, which are preserved in the copy to be 7129 -- used for subsequent inlining. 7130 7131 null; 7132 7133 else 7134 Set_Entity (New_N, Empty); 7135 end if; 7136 end if; 7137 end; 7138 end if; 7139 7140 -- For expanded name, we must copy the Prefix and Selector_Name 7141 7142 if Nkind (N) = N_Expanded_Name then 7143 Set_Prefix 7144 (New_N, Copy_Generic_Node (Prefix (N), New_N, Instantiating)); 7145 7146 Set_Selector_Name (New_N, 7147 Copy_Generic_Node (Selector_Name (N), New_N, Instantiating)); 7148 7149 -- For operators, we must copy the right operand 7150 7151 elsif Nkind (N) in N_Op then 7152 Set_Right_Opnd (New_N, 7153 Copy_Generic_Node (Right_Opnd (N), New_N, Instantiating)); 7154 7155 -- And for binary operators, the left operand as well 7156 7157 if Nkind (N) in N_Binary_Op then 7158 Set_Left_Opnd (New_N, 7159 Copy_Generic_Node (Left_Opnd (N), New_N, Instantiating)); 7160 end if; 7161 end if; 7162 7163 -- Special casing for stubs 7164 7165 elsif Nkind (N) in N_Body_Stub then 7166 7167 -- In any case, we must copy the specification or defining 7168 -- identifier as appropriate. 7169 7170 if Nkind (N) = N_Subprogram_Body_Stub then 7171 Set_Specification (New_N, 7172 Copy_Generic_Node (Specification (N), New_N, Instantiating)); 7173 7174 else 7175 Set_Defining_Identifier (New_N, 7176 Copy_Generic_Node 7177 (Defining_Identifier (N), New_N, Instantiating)); 7178 end if; 7179 7180 -- If we are not instantiating, then this is where we load and 7181 -- analyze subunits, i.e. at the point where the stub occurs. A 7182 -- more permissive system might defer this analysis to the point 7183 -- of instantiation, but this seems too complicated for now. 7184 7185 if not Instantiating then 7186 declare 7187 Subunit_Name : constant Unit_Name_Type := Get_Unit_Name (N); 7188 Subunit : Node_Id; 7189 Unum : Unit_Number_Type; 7190 New_Body : Node_Id; 7191 7192 begin 7193 -- Make sure that, if it is a subunit of the main unit that is 7194 -- preprocessed and if -gnateG is specified, the preprocessed 7195 -- file will be written. 7196 7197 Lib.Analysing_Subunit_Of_Main := 7198 Lib.In_Extended_Main_Source_Unit (N); 7199 Unum := 7200 Load_Unit 7201 (Load_Name => Subunit_Name, 7202 Required => False, 7203 Subunit => True, 7204 Error_Node => N); 7205 Lib.Analysing_Subunit_Of_Main := False; 7206 7207 -- If the proper body is not found, a warning message will be 7208 -- emitted when analyzing the stub, or later at the point of 7209 -- instantiation. Here we just leave the stub as is. 7210 7211 if Unum = No_Unit then 7212 Subunits_Missing := True; 7213 goto Subunit_Not_Found; 7214 end if; 7215 7216 Subunit := Cunit (Unum); 7217 7218 if Nkind (Unit (Subunit)) /= N_Subunit then 7219 Error_Msg_N 7220 ("found child unit instead of expected SEPARATE subunit", 7221 Subunit); 7222 Error_Msg_Sloc := Sloc (N); 7223 Error_Msg_N ("\to complete stub #", Subunit); 7224 goto Subunit_Not_Found; 7225 end if; 7226 7227 -- We must create a generic copy of the subunit, in order to 7228 -- perform semantic analysis on it, and we must replace the 7229 -- stub in the original generic unit with the subunit, in order 7230 -- to preserve non-local references within. 7231 7232 -- Only the proper body needs to be copied. Library_Unit and 7233 -- context clause are simply inherited by the generic copy. 7234 -- Note that the copy (which may be recursive if there are 7235 -- nested subunits) must be done first, before attaching it to 7236 -- the enclosing generic. 7237 7238 New_Body := 7239 Copy_Generic_Node 7240 (Proper_Body (Unit (Subunit)), 7241 Empty, Instantiating => False); 7242 7243 -- Now place the original proper body in the original generic 7244 -- unit. This is a body, not a compilation unit. 7245 7246 Rewrite (N, Proper_Body (Unit (Subunit))); 7247 Set_Is_Compilation_Unit (Defining_Entity (N), False); 7248 Set_Was_Originally_Stub (N); 7249 7250 -- Finally replace the body of the subunit with its copy, and 7251 -- make this new subunit into the library unit of the generic 7252 -- copy, which does not have stubs any longer. 7253 7254 Set_Proper_Body (Unit (Subunit), New_Body); 7255 Set_Library_Unit (New_N, Subunit); 7256 Inherit_Context (Unit (Subunit), N); 7257 end; 7258 7259 -- If we are instantiating, this must be an error case, since 7260 -- otherwise we would have replaced the stub node by the proper body 7261 -- that corresponds. So just ignore it in the copy (i.e. we have 7262 -- copied it, and that is good enough). 7263 7264 else 7265 null; 7266 end if; 7267 7268 <<Subunit_Not_Found>> null; 7269 7270 -- If the node is a compilation unit, it is the subunit of a stub, which 7271 -- has been loaded already (see code below). In this case, the library 7272 -- unit field of N points to the parent unit (which is a compilation 7273 -- unit) and need not (and cannot) be copied. 7274 7275 -- When the proper body of the stub is analyzed, the library_unit link 7276 -- is used to establish the proper context (see sem_ch10). 7277 7278 -- The other fields of a compilation unit are copied as usual 7279 7280 elsif Nkind (N) = N_Compilation_Unit then 7281 7282 -- This code can only be executed when not instantiating, because in 7283 -- the copy made for an instantiation, the compilation unit node has 7284 -- disappeared at the point that a stub is replaced by its proper 7285 -- body. 7286 7287 pragma Assert (not Instantiating); 7288 7289 Set_Context_Items (New_N, 7290 Copy_Generic_List (Context_Items (N), New_N)); 7291 7292 Set_Unit (New_N, 7293 Copy_Generic_Node (Unit (N), New_N, False)); 7294 7295 Set_First_Inlined_Subprogram (New_N, 7296 Copy_Generic_Node 7297 (First_Inlined_Subprogram (N), New_N, False)); 7298 7299 Set_Aux_Decls_Node (New_N, 7300 Copy_Generic_Node (Aux_Decls_Node (N), New_N, False)); 7301 7302 -- For an assignment node, the assignment is known to be semantically 7303 -- legal if we are instantiating the template. This avoids incorrect 7304 -- diagnostics in generated code. 7305 7306 elsif Nkind (N) = N_Assignment_Statement then 7307 7308 -- Copy name and expression fields in usual manner 7309 7310 Set_Name (New_N, 7311 Copy_Generic_Node (Name (N), New_N, Instantiating)); 7312 7313 Set_Expression (New_N, 7314 Copy_Generic_Node (Expression (N), New_N, Instantiating)); 7315 7316 if Instantiating then 7317 Set_Assignment_OK (Name (New_N), True); 7318 end if; 7319 7320 elsif Nkind_In (N, N_Aggregate, N_Extension_Aggregate) then 7321 if not Instantiating then 7322 Set_Associated_Node (N, New_N); 7323 7324 else 7325 if Present (Get_Associated_Node (N)) 7326 and then Nkind (Get_Associated_Node (N)) = Nkind (N) 7327 then 7328 -- In the generic the aggregate has some composite type. If at 7329 -- the point of instantiation the type has a private view, 7330 -- install the full view (and that of its ancestors, if any). 7331 7332 declare 7333 T : Entity_Id := (Etype (Get_Associated_Node (New_N))); 7334 Rt : Entity_Id; 7335 7336 begin 7337 if Present (T) and then Is_Private_Type (T) then 7338 Switch_View (T); 7339 end if; 7340 7341 if Present (T) 7342 and then Is_Tagged_Type (T) 7343 and then Is_Derived_Type (T) 7344 then 7345 Rt := Root_Type (T); 7346 7347 loop 7348 T := Etype (T); 7349 7350 if Is_Private_Type (T) then 7351 Switch_View (T); 7352 end if; 7353 7354 exit when T = Rt; 7355 end loop; 7356 end if; 7357 end; 7358 end if; 7359 end if; 7360 7361 -- Do not copy the associated node, which points to the generic copy 7362 -- of the aggregate. 7363 7364 declare 7365 use Atree.Unchecked_Access; 7366 -- This code section is part of the implementation of an untyped 7367 -- tree traversal, so it needs direct access to node fields. 7368 7369 begin 7370 Set_Field1 (New_N, Copy_Generic_Descendant (Field1 (N))); 7371 Set_Field2 (New_N, Copy_Generic_Descendant (Field2 (N))); 7372 Set_Field3 (New_N, Copy_Generic_Descendant (Field3 (N))); 7373 Set_Field5 (New_N, Copy_Generic_Descendant (Field5 (N))); 7374 end; 7375 7376 -- Allocators do not have an identifier denoting the access type, so we 7377 -- must locate it through the expression to check whether the views are 7378 -- consistent. 7379 7380 elsif Nkind (N) = N_Allocator 7381 and then Nkind (Expression (N)) = N_Qualified_Expression 7382 and then Is_Entity_Name (Subtype_Mark (Expression (N))) 7383 and then Instantiating 7384 then 7385 declare 7386 T : constant Node_Id := 7387 Get_Associated_Node (Subtype_Mark (Expression (N))); 7388 Acc_T : Entity_Id; 7389 7390 begin 7391 if Present (T) then 7392 7393 -- Retrieve the allocator node in the generic copy 7394 7395 Acc_T := Etype (Parent (Parent (T))); 7396 7397 if Present (Acc_T) and then Is_Private_Type (Acc_T) then 7398 Switch_View (Acc_T); 7399 end if; 7400 end if; 7401 7402 Copy_Descendants; 7403 end; 7404 7405 -- For a proper body, we must catch the case of a proper body that 7406 -- replaces a stub. This represents the point at which a separate 7407 -- compilation unit, and hence template file, may be referenced, so we 7408 -- must make a new source instantiation entry for the template of the 7409 -- subunit, and ensure that all nodes in the subunit are adjusted using 7410 -- this new source instantiation entry. 7411 7412 elsif Nkind (N) in N_Proper_Body then 7413 declare 7414 Save_Adjustment : constant Sloc_Adjustment := S_Adjustment; 7415 7416 begin 7417 if Instantiating and then Was_Originally_Stub (N) then 7418 Create_Instantiation_Source 7419 (Instantiation_Node, 7420 Defining_Entity (N), 7421 False, 7422 S_Adjustment); 7423 end if; 7424 7425 -- Now copy the fields of the proper body, using the new 7426 -- adjustment factor if one was needed as per test above. 7427 7428 Copy_Descendants; 7429 7430 -- Restore the original adjustment factor in case changed 7431 7432 S_Adjustment := Save_Adjustment; 7433 end; 7434 7435 -- Don't copy Ident or Comment pragmas, since the comment belongs to the 7436 -- generic unit, not to the instantiating unit. 7437 7438 elsif Nkind (N) = N_Pragma and then Instantiating then 7439 declare 7440 Prag_Id : constant Pragma_Id := Get_Pragma_Id (N); 7441 begin 7442 if Prag_Id = Pragma_Ident or else Prag_Id = Pragma_Comment then 7443 New_N := Make_Null_Statement (Sloc (N)); 7444 else 7445 Copy_Descendants; 7446 end if; 7447 end; 7448 7449 elsif Nkind_In (N, N_Integer_Literal, N_Real_Literal) then 7450 7451 -- No descendant fields need traversing 7452 7453 null; 7454 7455 elsif Nkind (N) = N_String_Literal 7456 and then Present (Etype (N)) 7457 and then Instantiating 7458 then 7459 -- If the string is declared in an outer scope, the string_literal 7460 -- subtype created for it may have the wrong scope. Force reanalysis 7461 -- of the constant to generate a new itype in the proper context. 7462 7463 Set_Etype (New_N, Empty); 7464 Set_Analyzed (New_N, False); 7465 7466 -- For the remaining nodes, copy their descendants recursively 7467 7468 else 7469 Copy_Descendants; 7470 7471 if Instantiating and then Nkind (N) = N_Subprogram_Body then 7472 Set_Generic_Parent (Specification (New_N), N); 7473 7474 -- Should preserve Corresponding_Spec??? (12.3(14)) 7475 end if; 7476 end if; 7477 7478 return New_N; 7479 end Copy_Generic_Node; 7480 7481 ---------------------------- 7482 -- Denotes_Formal_Package -- 7483 ---------------------------- 7484 7485 function Denotes_Formal_Package 7486 (Pack : Entity_Id; 7487 On_Exit : Boolean := False; 7488 Instance : Entity_Id := Empty) return Boolean 7489 is 7490 Par : Entity_Id; 7491 Scop : constant Entity_Id := Scope (Pack); 7492 E : Entity_Id; 7493 7494 function Is_Actual_Of_Previous_Formal (P : Entity_Id) return Boolean; 7495 -- The package in question may be an actual for a previous formal 7496 -- package P of the current instance, so examine its actuals as well. 7497 -- This must be recursive over other formal packages. 7498 7499 ---------------------------------- 7500 -- Is_Actual_Of_Previous_Formal -- 7501 ---------------------------------- 7502 7503 function Is_Actual_Of_Previous_Formal (P : Entity_Id) return Boolean is 7504 E1 : Entity_Id; 7505 7506 begin 7507 E1 := First_Entity (P); 7508 while Present (E1) and then E1 /= Instance loop 7509 if Ekind (E1) = E_Package 7510 and then Nkind (Parent (E1)) = N_Package_Renaming_Declaration 7511 then 7512 if Renamed_Object (E1) = Pack then 7513 return True; 7514 7515 elsif E1 = P or else Renamed_Object (E1) = P then 7516 return False; 7517 7518 elsif Is_Actual_Of_Previous_Formal (E1) then 7519 return True; 7520 end if; 7521 end if; 7522 7523 Next_Entity (E1); 7524 end loop; 7525 7526 return False; 7527 end Is_Actual_Of_Previous_Formal; 7528 7529 -- Start of processing for Denotes_Formal_Package 7530 7531 begin 7532 if On_Exit then 7533 Par := 7534 Instance_Envs.Table 7535 (Instance_Envs.Last).Instantiated_Parent.Act_Id; 7536 else 7537 Par := Current_Instantiated_Parent.Act_Id; 7538 end if; 7539 7540 if Ekind (Scop) = E_Generic_Package 7541 or else Nkind (Unit_Declaration_Node (Scop)) = 7542 N_Generic_Subprogram_Declaration 7543 then 7544 return True; 7545 7546 elsif Nkind (Original_Node (Unit_Declaration_Node (Pack))) = 7547 N_Formal_Package_Declaration 7548 then 7549 return True; 7550 7551 elsif No (Par) then 7552 return False; 7553 7554 else 7555 -- Check whether this package is associated with a formal package of 7556 -- the enclosing instantiation. Iterate over the list of renamings. 7557 7558 E := First_Entity (Par); 7559 while Present (E) loop 7560 if Ekind (E) /= E_Package 7561 or else Nkind (Parent (E)) /= N_Package_Renaming_Declaration 7562 then 7563 null; 7564 7565 elsif Renamed_Object (E) = Par then 7566 return False; 7567 7568 elsif Renamed_Object (E) = Pack then 7569 return True; 7570 7571 elsif Is_Actual_Of_Previous_Formal (E) then 7572 return True; 7573 7574 end if; 7575 7576 Next_Entity (E); 7577 end loop; 7578 7579 return False; 7580 end if; 7581 end Denotes_Formal_Package; 7582 7583 ----------------- 7584 -- End_Generic -- 7585 ----------------- 7586 7587 procedure End_Generic is 7588 begin 7589 -- ??? More things could be factored out in this routine. Should 7590 -- probably be done at a later stage. 7591 7592 Inside_A_Generic := Generic_Flags.Table (Generic_Flags.Last); 7593 Generic_Flags.Decrement_Last; 7594 7595 Expander_Mode_Restore; 7596 end End_Generic; 7597 7598 ------------- 7599 -- Earlier -- 7600 ------------- 7601 7602 function Earlier (N1, N2 : Node_Id) return Boolean is 7603 procedure Find_Depth (P : in out Node_Id; D : in out Integer); 7604 -- Find distance from given node to enclosing compilation unit 7605 7606 ---------------- 7607 -- Find_Depth -- 7608 ---------------- 7609 7610 procedure Find_Depth (P : in out Node_Id; D : in out Integer) is 7611 begin 7612 while Present (P) 7613 and then Nkind (P) /= N_Compilation_Unit 7614 loop 7615 P := True_Parent (P); 7616 D := D + 1; 7617 end loop; 7618 end Find_Depth; 7619 7620 -- Local declarations 7621 7622 D1 : Integer := 0; 7623 D2 : Integer := 0; 7624 P1 : Node_Id := N1; 7625 P2 : Node_Id := N2; 7626 T1 : Source_Ptr; 7627 T2 : Source_Ptr; 7628 7629 -- Start of processing for Earlier 7630 7631 begin 7632 Find_Depth (P1, D1); 7633 Find_Depth (P2, D2); 7634 7635 if P1 /= P2 then 7636 return False; 7637 else 7638 P1 := N1; 7639 P2 := N2; 7640 end if; 7641 7642 while D1 > D2 loop 7643 P1 := True_Parent (P1); 7644 D1 := D1 - 1; 7645 end loop; 7646 7647 while D2 > D1 loop 7648 P2 := True_Parent (P2); 7649 D2 := D2 - 1; 7650 end loop; 7651 7652 -- At this point P1 and P2 are at the same distance from the root. 7653 -- We examine their parents until we find a common declarative list. 7654 -- If we reach the root, N1 and N2 do not descend from the same 7655 -- declarative list (e.g. one is nested in the declarative part and 7656 -- the other is in a block in the statement part) and the earlier 7657 -- one is already frozen. 7658 7659 while not Is_List_Member (P1) 7660 or else not Is_List_Member (P2) 7661 or else List_Containing (P1) /= List_Containing (P2) 7662 loop 7663 P1 := True_Parent (P1); 7664 P2 := True_Parent (P2); 7665 7666 if Nkind (Parent (P1)) = N_Subunit then 7667 P1 := Corresponding_Stub (Parent (P1)); 7668 end if; 7669 7670 if Nkind (Parent (P2)) = N_Subunit then 7671 P2 := Corresponding_Stub (Parent (P2)); 7672 end if; 7673 7674 if P1 = P2 then 7675 return False; 7676 end if; 7677 end loop; 7678 7679 -- Expanded code usually shares the source location of the original 7680 -- construct it was generated for. This however may not necessarely 7681 -- reflect the true location of the code within the tree. 7682 7683 -- Before comparing the slocs of the two nodes, make sure that we are 7684 -- working with correct source locations. Assume that P1 is to the left 7685 -- of P2. If either one does not come from source, traverse the common 7686 -- list heading towards the other node and locate the first source 7687 -- statement. 7688 7689 -- P1 P2 7690 -- ----+===+===+--------------+===+===+---- 7691 -- expanded code expanded code 7692 7693 if not Comes_From_Source (P1) then 7694 while Present (P1) loop 7695 7696 -- Neither P2 nor a source statement were located during the 7697 -- search. If we reach the end of the list, then P1 does not 7698 -- occur earlier than P2. 7699 7700 -- ----> 7701 -- start --- P2 ----- P1 --- end 7702 7703 if No (Next (P1)) then 7704 return False; 7705 7706 -- We encounter P2 while going to the right of the list. This 7707 -- means that P1 does indeed appear earlier. 7708 7709 -- ----> 7710 -- start --- P1 ===== P2 --- end 7711 -- expanded code in between 7712 7713 elsif P1 = P2 then 7714 return True; 7715 7716 -- No need to look any further since we have located a source 7717 -- statement. 7718 7719 elsif Comes_From_Source (P1) then 7720 exit; 7721 end if; 7722 7723 -- Keep going right 7724 7725 Next (P1); 7726 end loop; 7727 end if; 7728 7729 if not Comes_From_Source (P2) then 7730 while Present (P2) loop 7731 7732 -- Neither P1 nor a source statement were located during the 7733 -- search. If we reach the start of the list, then P1 does not 7734 -- occur earlier than P2. 7735 7736 -- <---- 7737 -- start --- P2 --- P1 --- end 7738 7739 if No (Prev (P2)) then 7740 return False; 7741 7742 -- We encounter P1 while going to the left of the list. This 7743 -- means that P1 does indeed appear earlier. 7744 7745 -- <---- 7746 -- start --- P1 ===== P2 --- end 7747 -- expanded code in between 7748 7749 elsif P2 = P1 then 7750 return True; 7751 7752 -- No need to look any further since we have located a source 7753 -- statement. 7754 7755 elsif Comes_From_Source (P2) then 7756 exit; 7757 end if; 7758 7759 -- Keep going left 7760 7761 Prev (P2); 7762 end loop; 7763 end if; 7764 7765 -- At this point either both nodes came from source or we approximated 7766 -- their source locations through neighbouring source statements. 7767 7768 T1 := Top_Level_Location (Sloc (P1)); 7769 T2 := Top_Level_Location (Sloc (P2)); 7770 7771 -- When two nodes come from the same instance, they have identical top 7772 -- level locations. To determine proper relation within the tree, check 7773 -- their locations within the template. 7774 7775 if T1 = T2 then 7776 return Sloc (P1) < Sloc (P2); 7777 7778 -- The two nodes either come from unrelated instances or do not come 7779 -- from instantiated code at all. 7780 7781 else 7782 return T1 < T2; 7783 end if; 7784 end Earlier; 7785 7786 ---------------------- 7787 -- Find_Actual_Type -- 7788 ---------------------- 7789 7790 function Find_Actual_Type 7791 (Typ : Entity_Id; 7792 Gen_Type : Entity_Id) return Entity_Id 7793 is 7794 Gen_Scope : constant Entity_Id := Scope (Gen_Type); 7795 T : Entity_Id; 7796 7797 begin 7798 -- Special processing only applies to child units 7799 7800 if not Is_Child_Unit (Gen_Scope) then 7801 return Get_Instance_Of (Typ); 7802 7803 -- If designated or component type is itself a formal of the child unit, 7804 -- its instance is available. 7805 7806 elsif Scope (Typ) = Gen_Scope then 7807 return Get_Instance_Of (Typ); 7808 7809 -- If the array or access type is not declared in the parent unit, 7810 -- no special processing needed. 7811 7812 elsif not Is_Generic_Type (Typ) 7813 and then Scope (Gen_Scope) /= Scope (Typ) 7814 then 7815 return Get_Instance_Of (Typ); 7816 7817 -- Otherwise, retrieve designated or component type by visibility 7818 7819 else 7820 T := Current_Entity (Typ); 7821 while Present (T) loop 7822 if In_Open_Scopes (Scope (T)) then 7823 return T; 7824 elsif Is_Generic_Actual_Type (T) then 7825 return T; 7826 end if; 7827 7828 T := Homonym (T); 7829 end loop; 7830 7831 return Typ; 7832 end if; 7833 end Find_Actual_Type; 7834 7835 ---------------------------- 7836 -- Freeze_Subprogram_Body -- 7837 ---------------------------- 7838 7839 procedure Freeze_Subprogram_Body 7840 (Inst_Node : Node_Id; 7841 Gen_Body : Node_Id; 7842 Pack_Id : Entity_Id) 7843 is 7844 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node); 7845 Par : constant Entity_Id := Scope (Gen_Unit); 7846 E_G_Id : Entity_Id; 7847 Enc_G : Entity_Id; 7848 Enc_I : Node_Id; 7849 F_Node : Node_Id; 7850 7851 function Enclosing_Package_Body (N : Node_Id) return Node_Id; 7852 -- Find innermost package body that encloses the given node, and which 7853 -- is not a compilation unit. Freeze nodes for the instance, or for its 7854 -- enclosing body, may be inserted after the enclosing_body of the 7855 -- generic unit. Used to determine proper placement of freeze node for 7856 -- both package and subprogram instances. 7857 7858 function Package_Freeze_Node (B : Node_Id) return Node_Id; 7859 -- Find entity for given package body, and locate or create a freeze 7860 -- node for it. 7861 7862 ---------------------------- 7863 -- Enclosing_Package_Body -- 7864 ---------------------------- 7865 7866 function Enclosing_Package_Body (N : Node_Id) return Node_Id is 7867 P : Node_Id; 7868 7869 begin 7870 P := Parent (N); 7871 while Present (P) 7872 and then Nkind (Parent (P)) /= N_Compilation_Unit 7873 loop 7874 if Nkind (P) = N_Package_Body then 7875 if Nkind (Parent (P)) = N_Subunit then 7876 return Corresponding_Stub (Parent (P)); 7877 else 7878 return P; 7879 end if; 7880 end if; 7881 7882 P := True_Parent (P); 7883 end loop; 7884 7885 return Empty; 7886 end Enclosing_Package_Body; 7887 7888 ------------------------- 7889 -- Package_Freeze_Node -- 7890 ------------------------- 7891 7892 function Package_Freeze_Node (B : Node_Id) return Node_Id is 7893 Id : Entity_Id; 7894 7895 begin 7896 if Nkind (B) = N_Package_Body then 7897 Id := Corresponding_Spec (B); 7898 else pragma Assert (Nkind (B) = N_Package_Body_Stub); 7899 Id := Corresponding_Spec (Proper_Body (Unit (Library_Unit (B)))); 7900 end if; 7901 7902 Ensure_Freeze_Node (Id); 7903 return Freeze_Node (Id); 7904 end Package_Freeze_Node; 7905 7906 -- Start of processing of Freeze_Subprogram_Body 7907 7908 begin 7909 -- If the instance and the generic body appear within the same unit, and 7910 -- the instance precedes the generic, the freeze node for the instance 7911 -- must appear after that of the generic. If the generic is nested 7912 -- within another instance I2, then current instance must be frozen 7913 -- after I2. In both cases, the freeze nodes are those of enclosing 7914 -- packages. Otherwise, the freeze node is placed at the end of the 7915 -- current declarative part. 7916 7917 Enc_G := Enclosing_Package_Body (Gen_Body); 7918 Enc_I := Enclosing_Package_Body (Inst_Node); 7919 Ensure_Freeze_Node (Pack_Id); 7920 F_Node := Freeze_Node (Pack_Id); 7921 7922 if Is_Generic_Instance (Par) 7923 and then Present (Freeze_Node (Par)) 7924 and then In_Same_Declarative_Part (Freeze_Node (Par), Inst_Node) 7925 then 7926 -- The parent was a premature instantiation. Insert freeze node at 7927 -- the end the current declarative part. 7928 7929 if ABE_Is_Certain (Get_Package_Instantiation_Node (Par)) then 7930 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node); 7931 7932 -- Handle the following case: 7933 -- 7934 -- package Parent_Inst is new ... 7935 -- Parent_Inst [] 7936 -- 7937 -- procedure P ... -- this body freezes Parent_Inst 7938 -- 7939 -- package Inst is new ... 7940 -- 7941 -- In this particular scenario, the freeze node for Inst must be 7942 -- inserted in the same manner as that of Parent_Inst - before the 7943 -- next source body or at the end of the declarative list (body not 7944 -- available). If body P did not exist and Parent_Inst was frozen 7945 -- after Inst, either by a body following Inst or at the end of the 7946 -- declarative region, the freeze node for Inst must be inserted 7947 -- after that of Parent_Inst. This relation is established by 7948 -- comparing the Slocs of Parent_Inst freeze node and Inst. 7949 7950 elsif List_Containing (Get_Package_Instantiation_Node (Par)) = 7951 List_Containing (Inst_Node) 7952 and then Sloc (Freeze_Node (Par)) < Sloc (Inst_Node) 7953 then 7954 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node); 7955 7956 else 7957 Insert_After (Freeze_Node (Par), F_Node); 7958 end if; 7959 7960 -- The body enclosing the instance should be frozen after the body that 7961 -- includes the generic, because the body of the instance may make 7962 -- references to entities therein. If the two are not in the same 7963 -- declarative part, or if the one enclosing the instance is frozen 7964 -- already, freeze the instance at the end of the current declarative 7965 -- part. 7966 7967 elsif Is_Generic_Instance (Par) 7968 and then Present (Freeze_Node (Par)) 7969 and then Present (Enc_I) 7970 then 7971 if In_Same_Declarative_Part (Freeze_Node (Par), Enc_I) 7972 or else 7973 (Nkind (Enc_I) = N_Package_Body 7974 and then 7975 In_Same_Declarative_Part (Freeze_Node (Par), Parent (Enc_I))) 7976 then 7977 -- The enclosing package may contain several instances. Rather 7978 -- than computing the earliest point at which to insert its freeze 7979 -- node, we place it at the end of the declarative part of the 7980 -- parent of the generic. 7981 7982 Insert_Freeze_Node_For_Instance 7983 (Freeze_Node (Par), Package_Freeze_Node (Enc_I)); 7984 end if; 7985 7986 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node); 7987 7988 elsif Present (Enc_G) 7989 and then Present (Enc_I) 7990 and then Enc_G /= Enc_I 7991 and then Earlier (Inst_Node, Gen_Body) 7992 then 7993 if Nkind (Enc_G) = N_Package_Body then 7994 E_G_Id := 7995 Corresponding_Spec (Enc_G); 7996 else pragma Assert (Nkind (Enc_G) = N_Package_Body_Stub); 7997 E_G_Id := 7998 Corresponding_Spec (Proper_Body (Unit (Library_Unit (Enc_G)))); 7999 end if; 8000 8001 -- Freeze package that encloses instance, and place node after the 8002 -- package that encloses generic. If enclosing package is already 8003 -- frozen we have to assume it is at the proper place. This may be a 8004 -- potential ABE that requires dynamic checking. Do not add a freeze 8005 -- node if the package that encloses the generic is inside the body 8006 -- that encloses the instance, because the freeze node would be in 8007 -- the wrong scope. Additional contortions needed if the bodies are 8008 -- within a subunit. 8009 8010 declare 8011 Enclosing_Body : Node_Id; 8012 8013 begin 8014 if Nkind (Enc_I) = N_Package_Body_Stub then 8015 Enclosing_Body := Proper_Body (Unit (Library_Unit (Enc_I))); 8016 else 8017 Enclosing_Body := Enc_I; 8018 end if; 8019 8020 if Parent (List_Containing (Enc_G)) /= Enclosing_Body then 8021 Insert_Freeze_Node_For_Instance 8022 (Enc_G, Package_Freeze_Node (Enc_I)); 8023 end if; 8024 end; 8025 8026 -- Freeze enclosing subunit before instance 8027 8028 Ensure_Freeze_Node (E_G_Id); 8029 8030 if not Is_List_Member (Freeze_Node (E_G_Id)) then 8031 Insert_After (Enc_G, Freeze_Node (E_G_Id)); 8032 end if; 8033 8034 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node); 8035 8036 else 8037 -- If none of the above, insert freeze node at the end of the current 8038 -- declarative part. 8039 8040 Insert_Freeze_Node_For_Instance (Inst_Node, F_Node); 8041 end if; 8042 end Freeze_Subprogram_Body; 8043 8044 ---------------- 8045 -- Get_Gen_Id -- 8046 ---------------- 8047 8048 function Get_Gen_Id (E : Assoc_Ptr) return Entity_Id is 8049 begin 8050 return Generic_Renamings.Table (E).Gen_Id; 8051 end Get_Gen_Id; 8052 8053 --------------------- 8054 -- Get_Instance_Of -- 8055 --------------------- 8056 8057 function Get_Instance_Of (A : Entity_Id) return Entity_Id is 8058 Res : constant Assoc_Ptr := Generic_Renamings_HTable.Get (A); 8059 8060 begin 8061 if Res /= Assoc_Null then 8062 return Generic_Renamings.Table (Res).Act_Id; 8063 8064 else 8065 -- On exit, entity is not instantiated: not a generic parameter, or 8066 -- else parameter of an inner generic unit. 8067 8068 return A; 8069 end if; 8070 end Get_Instance_Of; 8071 8072 ------------------------------------ 8073 -- Get_Package_Instantiation_Node -- 8074 ------------------------------------ 8075 8076 function Get_Package_Instantiation_Node (A : Entity_Id) return Node_Id is 8077 Decl : Node_Id := Unit_Declaration_Node (A); 8078 Inst : Node_Id; 8079 8080 begin 8081 -- If the Package_Instantiation attribute has been set on the package 8082 -- entity, then use it directly when it (or its Original_Node) refers 8083 -- to an N_Package_Instantiation node. In principle it should be 8084 -- possible to have this field set in all cases, which should be 8085 -- investigated, and would allow this function to be significantly 8086 -- simplified. ??? 8087 8088 Inst := Package_Instantiation (A); 8089 8090 if Present (Inst) then 8091 if Nkind (Inst) = N_Package_Instantiation then 8092 return Inst; 8093 8094 elsif Nkind (Original_Node (Inst)) = N_Package_Instantiation then 8095 return Original_Node (Inst); 8096 end if; 8097 end if; 8098 8099 -- If the instantiation is a compilation unit that does not need body 8100 -- then the instantiation node has been rewritten as a package 8101 -- declaration for the instance, and we return the original node. 8102 8103 -- If it is a compilation unit and the instance node has not been 8104 -- rewritten, then it is still the unit of the compilation. Finally, if 8105 -- a body is present, this is a parent of the main unit whose body has 8106 -- been compiled for inlining purposes, and the instantiation node has 8107 -- been rewritten with the instance body. 8108 8109 -- Otherwise the instantiation node appears after the declaration. If 8110 -- the entity is a formal package, the declaration may have been 8111 -- rewritten as a generic declaration (in the case of a formal with box) 8112 -- or left as a formal package declaration if it has actuals, and is 8113 -- found with a forward search. 8114 8115 if Nkind (Parent (Decl)) = N_Compilation_Unit then 8116 if Nkind (Decl) = N_Package_Declaration 8117 and then Present (Corresponding_Body (Decl)) 8118 then 8119 Decl := Unit_Declaration_Node (Corresponding_Body (Decl)); 8120 end if; 8121 8122 if Nkind (Original_Node (Decl)) = N_Package_Instantiation then 8123 return Original_Node (Decl); 8124 else 8125 return Unit (Parent (Decl)); 8126 end if; 8127 8128 elsif Nkind (Decl) = N_Package_Declaration 8129 and then Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration 8130 then 8131 return Original_Node (Decl); 8132 8133 else 8134 Inst := Next (Decl); 8135 while not Nkind_In (Inst, N_Package_Instantiation, 8136 N_Formal_Package_Declaration) 8137 loop 8138 Next (Inst); 8139 end loop; 8140 8141 return Inst; 8142 end if; 8143 end Get_Package_Instantiation_Node; 8144 8145 ------------------------ 8146 -- Has_Been_Exchanged -- 8147 ------------------------ 8148 8149 function Has_Been_Exchanged (E : Entity_Id) return Boolean is 8150 Next : Elmt_Id; 8151 8152 begin 8153 Next := First_Elmt (Exchanged_Views); 8154 while Present (Next) loop 8155 if Full_View (Node (Next)) = E then 8156 return True; 8157 end if; 8158 8159 Next_Elmt (Next); 8160 end loop; 8161 8162 return False; 8163 end Has_Been_Exchanged; 8164 8165 ---------- 8166 -- Hash -- 8167 ---------- 8168 8169 function Hash (F : Entity_Id) return HTable_Range is 8170 begin 8171 return HTable_Range (F mod HTable_Size); 8172 end Hash; 8173 8174 ------------------------ 8175 -- Hide_Current_Scope -- 8176 ------------------------ 8177 8178 procedure Hide_Current_Scope is 8179 C : constant Entity_Id := Current_Scope; 8180 E : Entity_Id; 8181 8182 begin 8183 Set_Is_Hidden_Open_Scope (C); 8184 8185 E := First_Entity (C); 8186 while Present (E) loop 8187 if Is_Immediately_Visible (E) then 8188 Set_Is_Immediately_Visible (E, False); 8189 Append_Elmt (E, Hidden_Entities); 8190 end if; 8191 8192 Next_Entity (E); 8193 end loop; 8194 8195 -- Make the scope name invisible as well. This is necessary, but might 8196 -- conflict with calls to Rtsfind later on, in case the scope is a 8197 -- predefined one. There is no clean solution to this problem, so for 8198 -- now we depend on the user not redefining Standard itself in one of 8199 -- the parent units. 8200 8201 if Is_Immediately_Visible (C) and then C /= Standard_Standard then 8202 Set_Is_Immediately_Visible (C, False); 8203 Append_Elmt (C, Hidden_Entities); 8204 end if; 8205 8206 end Hide_Current_Scope; 8207 8208 -------------- 8209 -- Init_Env -- 8210 -------------- 8211 8212 procedure Init_Env is 8213 Saved : Instance_Env; 8214 8215 begin 8216 Saved.Instantiated_Parent := Current_Instantiated_Parent; 8217 Saved.Exchanged_Views := Exchanged_Views; 8218 Saved.Hidden_Entities := Hidden_Entities; 8219 Saved.Current_Sem_Unit := Current_Sem_Unit; 8220 Saved.Parent_Unit_Visible := Parent_Unit_Visible; 8221 Saved.Instance_Parent_Unit := Instance_Parent_Unit; 8222 8223 -- Save configuration switches. These may be reset if the unit is a 8224 -- predefined unit, and the current mode is not Ada 2005. 8225 8226 Save_Opt_Config_Switches (Saved.Switches); 8227 8228 Instance_Envs.Append (Saved); 8229 8230 Exchanged_Views := New_Elmt_List; 8231 Hidden_Entities := New_Elmt_List; 8232 8233 -- Make dummy entry for Instantiated parent. If generic unit is legal, 8234 -- this is set properly in Set_Instance_Env. 8235 8236 Current_Instantiated_Parent := 8237 (Current_Scope, Current_Scope, Assoc_Null); 8238 end Init_Env; 8239 8240 ------------------------------ 8241 -- In_Same_Declarative_Part -- 8242 ------------------------------ 8243 8244 function In_Same_Declarative_Part 8245 (F_Node : Node_Id; 8246 Inst : Node_Id) return Boolean 8247 is 8248 Decls : constant Node_Id := Parent (F_Node); 8249 Nod : Node_Id; 8250 8251 begin 8252 Nod := Parent (Inst); 8253 while Present (Nod) loop 8254 if Nod = Decls then 8255 return True; 8256 8257 elsif Nkind_In (Nod, N_Subprogram_Body, 8258 N_Package_Body, 8259 N_Package_Declaration, 8260 N_Task_Body, 8261 N_Protected_Body, 8262 N_Block_Statement) 8263 then 8264 return False; 8265 8266 elsif Nkind (Nod) = N_Subunit then 8267 Nod := Corresponding_Stub (Nod); 8268 8269 elsif Nkind (Nod) = N_Compilation_Unit then 8270 return False; 8271 8272 else 8273 Nod := Parent (Nod); 8274 end if; 8275 end loop; 8276 8277 return False; 8278 end In_Same_Declarative_Part; 8279 8280 --------------------- 8281 -- In_Main_Context -- 8282 --------------------- 8283 8284 function In_Main_Context (E : Entity_Id) return Boolean is 8285 Context : List_Id; 8286 Clause : Node_Id; 8287 Nam : Node_Id; 8288 8289 begin 8290 if not Is_Compilation_Unit (E) 8291 or else Ekind (E) /= E_Package 8292 or else In_Private_Part (E) 8293 then 8294 return False; 8295 end if; 8296 8297 Context := Context_Items (Cunit (Main_Unit)); 8298 8299 Clause := First (Context); 8300 while Present (Clause) loop 8301 if Nkind (Clause) = N_With_Clause then 8302 Nam := Name (Clause); 8303 8304 -- If the current scope is part of the context of the main unit, 8305 -- analysis of the corresponding with_clause is not complete, and 8306 -- the entity is not set. We use the Chars field directly, which 8307 -- might produce false positives in rare cases, but guarantees 8308 -- that we produce all the instance bodies we will need. 8309 8310 if (Is_Entity_Name (Nam) and then Chars (Nam) = Chars (E)) 8311 or else (Nkind (Nam) = N_Selected_Component 8312 and then Chars (Selector_Name (Nam)) = Chars (E)) 8313 then 8314 return True; 8315 end if; 8316 end if; 8317 8318 Next (Clause); 8319 end loop; 8320 8321 return False; 8322 end In_Main_Context; 8323 8324 --------------------- 8325 -- Inherit_Context -- 8326 --------------------- 8327 8328 procedure Inherit_Context (Gen_Decl : Node_Id; Inst : Node_Id) is 8329 Current_Context : List_Id; 8330 Current_Unit : Node_Id; 8331 Item : Node_Id; 8332 New_I : Node_Id; 8333 8334 Clause : Node_Id; 8335 OK : Boolean; 8336 Lib_Unit : Node_Id; 8337 8338 begin 8339 if Nkind (Parent (Gen_Decl)) = N_Compilation_Unit then 8340 8341 -- The inherited context is attached to the enclosing compilation 8342 -- unit. This is either the main unit, or the declaration for the 8343 -- main unit (in case the instantiation appears within the package 8344 -- declaration and the main unit is its body). 8345 8346 Current_Unit := Parent (Inst); 8347 while Present (Current_Unit) 8348 and then Nkind (Current_Unit) /= N_Compilation_Unit 8349 loop 8350 Current_Unit := Parent (Current_Unit); 8351 end loop; 8352 8353 Current_Context := Context_Items (Current_Unit); 8354 8355 Item := First (Context_Items (Parent (Gen_Decl))); 8356 while Present (Item) loop 8357 if Nkind (Item) = N_With_Clause then 8358 Lib_Unit := Library_Unit (Item); 8359 8360 -- Take care to prevent direct cyclic with's 8361 8362 if Lib_Unit /= Current_Unit then 8363 8364 -- Do not add a unit if it is already in the context 8365 8366 Clause := First (Current_Context); 8367 OK := True; 8368 while Present (Clause) loop 8369 if Nkind (Clause) = N_With_Clause and then 8370 Library_Unit (Clause) = Lib_Unit 8371 then 8372 OK := False; 8373 exit; 8374 end if; 8375 8376 Next (Clause); 8377 end loop; 8378 8379 if OK then 8380 New_I := New_Copy (Item); 8381 Set_Implicit_With (New_I, True); 8382 Set_Implicit_With_From_Instantiation (New_I, True); 8383 Append (New_I, Current_Context); 8384 end if; 8385 end if; 8386 end if; 8387 8388 Next (Item); 8389 end loop; 8390 end if; 8391 end Inherit_Context; 8392 8393 ---------------- 8394 -- Initialize -- 8395 ---------------- 8396 8397 procedure Initialize is 8398 begin 8399 Generic_Renamings.Init; 8400 Instance_Envs.Init; 8401 Generic_Flags.Init; 8402 Generic_Renamings_HTable.Reset; 8403 Circularity_Detected := False; 8404 Exchanged_Views := No_Elist; 8405 Hidden_Entities := No_Elist; 8406 end Initialize; 8407 8408 ------------------------------------- 8409 -- Insert_Freeze_Node_For_Instance -- 8410 ------------------------------------- 8411 8412 procedure Insert_Freeze_Node_For_Instance 8413 (N : Node_Id; 8414 F_Node : Node_Id) 8415 is 8416 Decl : Node_Id; 8417 Decls : List_Id; 8418 Inst : Entity_Id; 8419 Par_N : Node_Id; 8420 8421 function Enclosing_Body (N : Node_Id) return Node_Id; 8422 -- Find enclosing package or subprogram body, if any. Freeze node may 8423 -- be placed at end of current declarative list if previous instance 8424 -- and current one have different enclosing bodies. 8425 8426 function Previous_Instance (Gen : Entity_Id) return Entity_Id; 8427 -- Find the local instance, if any, that declares the generic that is 8428 -- being instantiated. If present, the freeze node for this instance 8429 -- must follow the freeze node for the previous instance. 8430 8431 -------------------- 8432 -- Enclosing_Body -- 8433 -------------------- 8434 8435 function Enclosing_Body (N : Node_Id) return Node_Id is 8436 P : Node_Id; 8437 8438 begin 8439 P := Parent (N); 8440 while Present (P) 8441 and then Nkind (Parent (P)) /= N_Compilation_Unit 8442 loop 8443 if Nkind_In (P, N_Package_Body, N_Subprogram_Body) then 8444 if Nkind (Parent (P)) = N_Subunit then 8445 return Corresponding_Stub (Parent (P)); 8446 else 8447 return P; 8448 end if; 8449 end if; 8450 8451 P := True_Parent (P); 8452 end loop; 8453 8454 return Empty; 8455 end Enclosing_Body; 8456 8457 ----------------------- 8458 -- Previous_Instance -- 8459 ----------------------- 8460 8461 function Previous_Instance (Gen : Entity_Id) return Entity_Id is 8462 S : Entity_Id; 8463 8464 begin 8465 S := Scope (Gen); 8466 while Present (S) and then S /= Standard_Standard loop 8467 if Is_Generic_Instance (S) 8468 and then In_Same_Source_Unit (S, N) 8469 then 8470 return S; 8471 end if; 8472 8473 S := Scope (S); 8474 end loop; 8475 8476 return Empty; 8477 end Previous_Instance; 8478 8479 -- Start of processing for Insert_Freeze_Node_For_Instance 8480 8481 begin 8482 if not Is_List_Member (F_Node) then 8483 Decl := N; 8484 Decls := List_Containing (N); 8485 Inst := Entity (F_Node); 8486 Par_N := Parent (Decls); 8487 8488 -- When processing a subprogram instantiation, utilize the actual 8489 -- subprogram instantiation rather than its package wrapper as it 8490 -- carries all the context information. 8491 8492 if Is_Wrapper_Package (Inst) then 8493 Inst := Related_Instance (Inst); 8494 end if; 8495 8496 -- If this is a package instance, check whether the generic is 8497 -- declared in a previous instance and the current instance is 8498 -- not within the previous one. 8499 8500 if Present (Generic_Parent (Parent (Inst))) 8501 and then Is_In_Main_Unit (N) 8502 then 8503 declare 8504 Enclosing_N : constant Node_Id := Enclosing_Body (N); 8505 Par_I : constant Entity_Id := 8506 Previous_Instance 8507 (Generic_Parent (Parent (Inst))); 8508 Scop : Entity_Id; 8509 8510 begin 8511 if Present (Par_I) 8512 and then Earlier (N, Freeze_Node (Par_I)) 8513 then 8514 Scop := Scope (Inst); 8515 8516 -- If the current instance is within the one that contains 8517 -- the generic, the freeze node for the current one must 8518 -- appear in the current declarative part. Ditto, if the 8519 -- current instance is within another package instance or 8520 -- within a body that does not enclose the current instance. 8521 -- In these three cases the freeze node of the previous 8522 -- instance is not relevant. 8523 8524 while Present (Scop) and then Scop /= Standard_Standard loop 8525 exit when Scop = Par_I 8526 or else 8527 (Is_Generic_Instance (Scop) 8528 and then Scope_Depth (Scop) > Scope_Depth (Par_I)); 8529 Scop := Scope (Scop); 8530 end loop; 8531 8532 -- Previous instance encloses current instance 8533 8534 if Scop = Par_I then 8535 null; 8536 8537 -- If the next node is a source body we must freeze in 8538 -- the current scope as well. 8539 8540 elsif Present (Next (N)) 8541 and then Nkind_In (Next (N), N_Subprogram_Body, 8542 N_Package_Body) 8543 and then Comes_From_Source (Next (N)) 8544 then 8545 null; 8546 8547 -- Current instance is within an unrelated instance 8548 8549 elsif Is_Generic_Instance (Scop) then 8550 null; 8551 8552 -- Current instance is within an unrelated body 8553 8554 elsif Present (Enclosing_N) 8555 and then Enclosing_N /= Enclosing_Body (Par_I) 8556 then 8557 null; 8558 8559 else 8560 Insert_After (Freeze_Node (Par_I), F_Node); 8561 return; 8562 end if; 8563 end if; 8564 end; 8565 end if; 8566 8567 -- When the instantiation occurs in a package declaration, append the 8568 -- freeze node to the private declarations (if any). 8569 8570 if Nkind (Par_N) = N_Package_Specification 8571 and then Decls = Visible_Declarations (Par_N) 8572 and then Present (Private_Declarations (Par_N)) 8573 and then not Is_Empty_List (Private_Declarations (Par_N)) 8574 then 8575 Decls := Private_Declarations (Par_N); 8576 Decl := First (Decls); 8577 end if; 8578 8579 -- Determine the proper freeze point of a package instantiation. We 8580 -- adhere to the general rule of a package or subprogram body causing 8581 -- freezing of anything before it in the same declarative region. In 8582 -- this case, the proper freeze point of a package instantiation is 8583 -- before the first source body which follows, or before a stub. This 8584 -- ensures that entities coming from the instance are already frozen 8585 -- and usable in source bodies. 8586 8587 if Nkind (Par_N) /= N_Package_Declaration 8588 and then Ekind (Inst) = E_Package 8589 and then Is_Generic_Instance (Inst) 8590 and then 8591 not In_Same_Source_Unit (Generic_Parent (Parent (Inst)), Inst) 8592 then 8593 while Present (Decl) loop 8594 if (Nkind (Decl) in N_Unit_Body 8595 or else 8596 Nkind (Decl) in N_Body_Stub) 8597 and then Comes_From_Source (Decl) 8598 then 8599 Insert_Before (Decl, F_Node); 8600 return; 8601 end if; 8602 8603 Next (Decl); 8604 end loop; 8605 end if; 8606 8607 -- In a package declaration, or if no previous body, insert at end 8608 -- of list. 8609 8610 Set_Sloc (F_Node, Sloc (Last (Decls))); 8611 Insert_After (Last (Decls), F_Node); 8612 end if; 8613 end Insert_Freeze_Node_For_Instance; 8614 8615 ------------------ 8616 -- Install_Body -- 8617 ------------------ 8618 8619 procedure Install_Body 8620 (Act_Body : Node_Id; 8621 N : Node_Id; 8622 Gen_Body : Node_Id; 8623 Gen_Decl : Node_Id) 8624 is 8625 Act_Id : constant Entity_Id := Corresponding_Spec (Act_Body); 8626 Act_Unit : constant Node_Id := Unit (Cunit (Get_Source_Unit (N))); 8627 Gen_Id : constant Entity_Id := Corresponding_Spec (Gen_Body); 8628 Par : constant Entity_Id := Scope (Gen_Id); 8629 Gen_Unit : constant Node_Id := 8630 Unit (Cunit (Get_Source_Unit (Gen_Decl))); 8631 Orig_Body : Node_Id := Gen_Body; 8632 F_Node : Node_Id; 8633 Body_Unit : Node_Id; 8634 8635 Must_Delay : Boolean; 8636 8637 function In_Same_Enclosing_Subp return Boolean; 8638 -- Check whether instance and generic body are within same subprogram. 8639 8640 function True_Sloc (N : Node_Id) return Source_Ptr; 8641 -- If the instance is nested inside a generic unit, the Sloc of the 8642 -- instance indicates the place of the original definition, not the 8643 -- point of the current enclosing instance. Pending a better usage of 8644 -- Slocs to indicate instantiation places, we determine the place of 8645 -- origin of a node by finding the maximum sloc of any ancestor node. 8646 -- Why is this not equivalent to Top_Level_Location ??? 8647 8648 ---------------------------- 8649 -- In_Same_Enclosing_Subp -- 8650 ---------------------------- 8651 8652 function In_Same_Enclosing_Subp return Boolean is 8653 Scop : Entity_Id; 8654 Subp : Entity_Id; 8655 8656 begin 8657 Scop := Scope (Act_Id); 8658 while Scop /= Standard_Standard 8659 and then not Is_Overloadable (Scop) 8660 loop 8661 Scop := Scope (Scop); 8662 end loop; 8663 8664 if Scop = Standard_Standard then 8665 return False; 8666 else 8667 Subp := Scop; 8668 end if; 8669 8670 Scop := Scope (Gen_Id); 8671 while Scop /= Standard_Standard loop 8672 if Scop = Subp then 8673 return True; 8674 else 8675 Scop := Scope (Scop); 8676 end if; 8677 end loop; 8678 8679 return False; 8680 end In_Same_Enclosing_Subp; 8681 8682 --------------- 8683 -- True_Sloc -- 8684 --------------- 8685 8686 function True_Sloc (N : Node_Id) return Source_Ptr is 8687 Res : Source_Ptr; 8688 N1 : Node_Id; 8689 8690 begin 8691 Res := Sloc (N); 8692 N1 := N; 8693 while Present (N1) and then N1 /= Act_Unit loop 8694 if Sloc (N1) > Res then 8695 Res := Sloc (N1); 8696 end if; 8697 8698 N1 := Parent (N1); 8699 end loop; 8700 8701 return Res; 8702 end True_Sloc; 8703 8704 -- Start of processing for Install_Body 8705 8706 begin 8707 -- If the body is a subunit, the freeze point is the corresponding stub 8708 -- in the current compilation, not the subunit itself. 8709 8710 if Nkind (Parent (Gen_Body)) = N_Subunit then 8711 Orig_Body := Corresponding_Stub (Parent (Gen_Body)); 8712 else 8713 Orig_Body := Gen_Body; 8714 end if; 8715 8716 Body_Unit := Unit (Cunit (Get_Source_Unit (Orig_Body))); 8717 8718 -- If the instantiation and the generic definition appear in the same 8719 -- package declaration, this is an early instantiation. If they appear 8720 -- in the same declarative part, it is an early instantiation only if 8721 -- the generic body appears textually later, and the generic body is 8722 -- also in the main unit. 8723 8724 -- If instance is nested within a subprogram, and the generic body 8725 -- is not, the instance is delayed because the enclosing body is. If 8726 -- instance and body are within the same scope, or the same subprogram 8727 -- body, indicate explicitly that the instance is delayed. 8728 8729 Must_Delay := 8730 (Gen_Unit = Act_Unit 8731 and then (Nkind_In (Gen_Unit, N_Package_Declaration, 8732 N_Generic_Package_Declaration) 8733 or else (Gen_Unit = Body_Unit 8734 and then True_Sloc (N) < Sloc (Orig_Body))) 8735 and then Is_In_Main_Unit (Gen_Unit) 8736 and then (Scope (Act_Id) = Scope (Gen_Id) 8737 or else In_Same_Enclosing_Subp)); 8738 8739 -- If this is an early instantiation, the freeze node is placed after 8740 -- the generic body. Otherwise, if the generic appears in an instance, 8741 -- we cannot freeze the current instance until the outer one is frozen. 8742 -- This is only relevant if the current instance is nested within some 8743 -- inner scope not itself within the outer instance. If this scope is 8744 -- a package body in the same declarative part as the outer instance, 8745 -- then that body needs to be frozen after the outer instance. Finally, 8746 -- if no delay is needed, we place the freeze node at the end of the 8747 -- current declarative part. 8748 8749 if Expander_Active then 8750 Ensure_Freeze_Node (Act_Id); 8751 F_Node := Freeze_Node (Act_Id); 8752 8753 if Must_Delay then 8754 Insert_After (Orig_Body, F_Node); 8755 8756 elsif Is_Generic_Instance (Par) 8757 and then Present (Freeze_Node (Par)) 8758 and then Scope (Act_Id) /= Par 8759 then 8760 -- Freeze instance of inner generic after instance of enclosing 8761 -- generic. 8762 8763 if In_Same_Declarative_Part (Freeze_Node (Par), N) then 8764 8765 -- Handle the following case: 8766 8767 -- package Parent_Inst is new ... 8768 -- Parent_Inst [] 8769 8770 -- procedure P ... -- this body freezes Parent_Inst 8771 8772 -- package Inst is new ... 8773 8774 -- In this particular scenario, the freeze node for Inst must 8775 -- be inserted in the same manner as that of Parent_Inst, 8776 -- before the next source body or at the end of the declarative 8777 -- list (body not available). If body P did not exist and 8778 -- Parent_Inst was frozen after Inst, either by a body 8779 -- following Inst or at the end of the declarative region, 8780 -- the freeze node for Inst must be inserted after that of 8781 -- Parent_Inst. This relation is established by comparing 8782 -- the Slocs of Parent_Inst freeze node and Inst. 8783 8784 if List_Containing (Get_Package_Instantiation_Node (Par)) = 8785 List_Containing (N) 8786 and then Sloc (Freeze_Node (Par)) < Sloc (N) 8787 then 8788 Insert_Freeze_Node_For_Instance (N, F_Node); 8789 else 8790 Insert_After (Freeze_Node (Par), F_Node); 8791 end if; 8792 8793 -- Freeze package enclosing instance of inner generic after 8794 -- instance of enclosing generic. 8795 8796 elsif Nkind_In (Parent (N), N_Package_Body, N_Subprogram_Body) 8797 and then In_Same_Declarative_Part (Freeze_Node (Par), Parent (N)) 8798 then 8799 declare 8800 Enclosing : Entity_Id; 8801 8802 begin 8803 Enclosing := Corresponding_Spec (Parent (N)); 8804 8805 if No (Enclosing) then 8806 Enclosing := Defining_Entity (Parent (N)); 8807 end if; 8808 8809 Insert_Freeze_Node_For_Instance (N, F_Node); 8810 Ensure_Freeze_Node (Enclosing); 8811 8812 if not Is_List_Member (Freeze_Node (Enclosing)) then 8813 8814 -- The enclosing context is a subunit, insert the freeze 8815 -- node after the stub. 8816 8817 if Nkind (Parent (Parent (N))) = N_Subunit then 8818 Insert_Freeze_Node_For_Instance 8819 (Corresponding_Stub (Parent (Parent (N))), 8820 Freeze_Node (Enclosing)); 8821 8822 -- The enclosing context is a package with a stub body 8823 -- which has already been replaced by the real body. 8824 -- Insert the freeze node after the actual body. 8825 8826 elsif Ekind (Enclosing) = E_Package 8827 and then Present (Body_Entity (Enclosing)) 8828 and then Was_Originally_Stub 8829 (Parent (Body_Entity (Enclosing))) 8830 then 8831 Insert_Freeze_Node_For_Instance 8832 (Parent (Body_Entity (Enclosing)), 8833 Freeze_Node (Enclosing)); 8834 8835 -- The parent instance has been frozen before the body of 8836 -- the enclosing package, insert the freeze node after 8837 -- the body. 8838 8839 elsif List_Containing (Freeze_Node (Par)) = 8840 List_Containing (Parent (N)) 8841 and then Sloc (Freeze_Node (Par)) < Sloc (Parent (N)) 8842 then 8843 Insert_Freeze_Node_For_Instance 8844 (Parent (N), Freeze_Node (Enclosing)); 8845 8846 else 8847 Insert_After 8848 (Freeze_Node (Par), Freeze_Node (Enclosing)); 8849 end if; 8850 end if; 8851 end; 8852 8853 else 8854 Insert_Freeze_Node_For_Instance (N, F_Node); 8855 end if; 8856 8857 else 8858 Insert_Freeze_Node_For_Instance (N, F_Node); 8859 end if; 8860 end if; 8861 8862 Set_Is_Frozen (Act_Id); 8863 Insert_Before (N, Act_Body); 8864 Mark_Rewrite_Insertion (Act_Body); 8865 end Install_Body; 8866 8867 ----------------------------- 8868 -- Install_Formal_Packages -- 8869 ----------------------------- 8870 8871 procedure Install_Formal_Packages (Par : Entity_Id) is 8872 E : Entity_Id; 8873 Gen : Entity_Id; 8874 Gen_E : Entity_Id := Empty; 8875 8876 begin 8877 E := First_Entity (Par); 8878 8879 -- If we are installing an instance parent, locate the formal packages 8880 -- of its generic parent. 8881 8882 if Is_Generic_Instance (Par) then 8883 Gen := Generic_Parent (Package_Specification (Par)); 8884 Gen_E := First_Entity (Gen); 8885 end if; 8886 8887 while Present (E) loop 8888 if Ekind (E) = E_Package 8889 and then Nkind (Parent (E)) = N_Package_Renaming_Declaration 8890 then 8891 -- If this is the renaming for the parent instance, done 8892 8893 if Renamed_Object (E) = Par then 8894 exit; 8895 8896 -- The visibility of a formal of an enclosing generic is already 8897 -- correct. 8898 8899 elsif Denotes_Formal_Package (E) then 8900 null; 8901 8902 elsif Present (Associated_Formal_Package (E)) then 8903 Check_Generic_Actuals (Renamed_Object (E), True); 8904 Set_Is_Hidden (E, False); 8905 8906 -- Find formal package in generic unit that corresponds to 8907 -- (instance of) formal package in instance. 8908 8909 while Present (Gen_E) and then Chars (Gen_E) /= Chars (E) loop 8910 Next_Entity (Gen_E); 8911 end loop; 8912 8913 if Present (Gen_E) then 8914 Map_Formal_Package_Entities (Gen_E, E); 8915 end if; 8916 end if; 8917 end if; 8918 8919 Next_Entity (E); 8920 8921 if Present (Gen_E) then 8922 Next_Entity (Gen_E); 8923 end if; 8924 end loop; 8925 end Install_Formal_Packages; 8926 8927 -------------------- 8928 -- Install_Parent -- 8929 -------------------- 8930 8931 procedure Install_Parent (P : Entity_Id; In_Body : Boolean := False) is 8932 Ancestors : constant Elist_Id := New_Elmt_List; 8933 S : constant Entity_Id := Current_Scope; 8934 Inst_Par : Entity_Id; 8935 First_Par : Entity_Id; 8936 Inst_Node : Node_Id; 8937 Gen_Par : Entity_Id; 8938 First_Gen : Entity_Id; 8939 Elmt : Elmt_Id; 8940 8941 procedure Install_Noninstance_Specs (Par : Entity_Id); 8942 -- Install the scopes of noninstance parent units ending with Par 8943 8944 procedure Install_Spec (Par : Entity_Id); 8945 -- The child unit is within the declarative part of the parent, so the 8946 -- declarations within the parent are immediately visible. 8947 8948 ------------------------------- 8949 -- Install_Noninstance_Specs -- 8950 ------------------------------- 8951 8952 procedure Install_Noninstance_Specs (Par : Entity_Id) is 8953 begin 8954 if Present (Par) 8955 and then Par /= Standard_Standard 8956 and then not In_Open_Scopes (Par) 8957 then 8958 Install_Noninstance_Specs (Scope (Par)); 8959 Install_Spec (Par); 8960 end if; 8961 end Install_Noninstance_Specs; 8962 8963 ------------------ 8964 -- Install_Spec -- 8965 ------------------ 8966 8967 procedure Install_Spec (Par : Entity_Id) is 8968 Spec : constant Node_Id := Package_Specification (Par); 8969 8970 begin 8971 -- If this parent of the child instance is a top-level unit, 8972 -- then record the unit and its visibility for later resetting in 8973 -- Remove_Parent. We exclude units that are generic instances, as we 8974 -- only want to record this information for the ultimate top-level 8975 -- noninstance parent (is that always correct???). 8976 8977 if Scope (Par) = Standard_Standard 8978 and then not Is_Generic_Instance (Par) 8979 then 8980 Parent_Unit_Visible := Is_Immediately_Visible (Par); 8981 Instance_Parent_Unit := Par; 8982 end if; 8983 8984 -- Open the parent scope and make it and its declarations visible. 8985 -- If this point is not within a body, then only the visible 8986 -- declarations should be made visible, and installation of the 8987 -- private declarations is deferred until the appropriate point 8988 -- within analysis of the spec being instantiated (see the handling 8989 -- of parent visibility in Analyze_Package_Specification). This is 8990 -- relaxed in the case where the parent unit is Ada.Tags, to avoid 8991 -- private view problems that occur when compiling instantiations of 8992 -- a generic child of that package (Generic_Dispatching_Constructor). 8993 -- If the instance freezes a tagged type, inlinings of operations 8994 -- from Ada.Tags may need the full view of type Tag. If inlining took 8995 -- proper account of establishing visibility of inlined subprograms' 8996 -- parents then it should be possible to remove this 8997 -- special check. ??? 8998 8999 Push_Scope (Par); 9000 Set_Is_Immediately_Visible (Par); 9001 Install_Visible_Declarations (Par); 9002 Set_Use (Visible_Declarations (Spec)); 9003 9004 if In_Body or else Is_RTU (Par, Ada_Tags) then 9005 Install_Private_Declarations (Par); 9006 Set_Use (Private_Declarations (Spec)); 9007 end if; 9008 end Install_Spec; 9009 9010 -- Start of processing for Install_Parent 9011 9012 begin 9013 -- We need to install the parent instance to compile the instantiation 9014 -- of the child, but the child instance must appear in the current 9015 -- scope. Given that we cannot place the parent above the current scope 9016 -- in the scope stack, we duplicate the current scope and unstack both 9017 -- after the instantiation is complete. 9018 9019 -- If the parent is itself the instantiation of a child unit, we must 9020 -- also stack the instantiation of its parent, and so on. Each such 9021 -- ancestor is the prefix of the name in a prior instantiation. 9022 9023 -- If this is a nested instance, the parent unit itself resolves to 9024 -- a renaming of the parent instance, whose declaration we need. 9025 9026 -- Finally, the parent may be a generic (not an instance) when the 9027 -- child unit appears as a formal package. 9028 9029 Inst_Par := P; 9030 9031 if Present (Renamed_Entity (Inst_Par)) then 9032 Inst_Par := Renamed_Entity (Inst_Par); 9033 end if; 9034 9035 First_Par := Inst_Par; 9036 9037 Gen_Par := Generic_Parent (Package_Specification (Inst_Par)); 9038 9039 First_Gen := Gen_Par; 9040 9041 while Present (Gen_Par) and then Is_Child_Unit (Gen_Par) loop 9042 9043 -- Load grandparent instance as well 9044 9045 Inst_Node := Get_Package_Instantiation_Node (Inst_Par); 9046 9047 if Nkind (Name (Inst_Node)) = N_Expanded_Name then 9048 Inst_Par := Entity (Prefix (Name (Inst_Node))); 9049 9050 if Present (Renamed_Entity (Inst_Par)) then 9051 Inst_Par := Renamed_Entity (Inst_Par); 9052 end if; 9053 9054 Gen_Par := Generic_Parent (Package_Specification (Inst_Par)); 9055 9056 if Present (Gen_Par) then 9057 Prepend_Elmt (Inst_Par, Ancestors); 9058 9059 else 9060 -- Parent is not the name of an instantiation 9061 9062 Install_Noninstance_Specs (Inst_Par); 9063 exit; 9064 end if; 9065 9066 else 9067 -- Previous error 9068 9069 exit; 9070 end if; 9071 end loop; 9072 9073 if Present (First_Gen) then 9074 Append_Elmt (First_Par, Ancestors); 9075 else 9076 Install_Noninstance_Specs (First_Par); 9077 end if; 9078 9079 if not Is_Empty_Elmt_List (Ancestors) then 9080 Elmt := First_Elmt (Ancestors); 9081 while Present (Elmt) loop 9082 Install_Spec (Node (Elmt)); 9083 Install_Formal_Packages (Node (Elmt)); 9084 Next_Elmt (Elmt); 9085 end loop; 9086 end if; 9087 9088 if not In_Body then 9089 Push_Scope (S); 9090 end if; 9091 end Install_Parent; 9092 9093 ------------------------------- 9094 -- Install_Hidden_Primitives -- 9095 ------------------------------- 9096 9097 procedure Install_Hidden_Primitives 9098 (Prims_List : in out Elist_Id; 9099 Gen_T : Entity_Id; 9100 Act_T : Entity_Id) 9101 is 9102 Elmt : Elmt_Id; 9103 List : Elist_Id := No_Elist; 9104 Prim_G_Elmt : Elmt_Id; 9105 Prim_A_Elmt : Elmt_Id; 9106 Prim_G : Node_Id; 9107 Prim_A : Node_Id; 9108 9109 begin 9110 -- No action needed in case of serious errors because we cannot trust 9111 -- in the order of primitives 9112 9113 if Serious_Errors_Detected > 0 then 9114 return; 9115 9116 -- No action possible if we don't have available the list of primitive 9117 -- operations 9118 9119 elsif No (Gen_T) 9120 or else not Is_Record_Type (Gen_T) 9121 or else not Is_Tagged_Type (Gen_T) 9122 or else not Is_Record_Type (Act_T) 9123 or else not Is_Tagged_Type (Act_T) 9124 then 9125 return; 9126 9127 -- There is no need to handle interface types since their primitives 9128 -- cannot be hidden 9129 9130 elsif Is_Interface (Gen_T) then 9131 return; 9132 end if; 9133 9134 Prim_G_Elmt := First_Elmt (Primitive_Operations (Gen_T)); 9135 9136 if not Is_Class_Wide_Type (Act_T) then 9137 Prim_A_Elmt := First_Elmt (Primitive_Operations (Act_T)); 9138 else 9139 Prim_A_Elmt := First_Elmt (Primitive_Operations (Root_Type (Act_T))); 9140 end if; 9141 9142 loop 9143 -- Skip predefined primitives in the generic formal 9144 9145 while Present (Prim_G_Elmt) 9146 and then Is_Predefined_Dispatching_Operation (Node (Prim_G_Elmt)) 9147 loop 9148 Next_Elmt (Prim_G_Elmt); 9149 end loop; 9150 9151 -- Skip predefined primitives in the generic actual 9152 9153 while Present (Prim_A_Elmt) 9154 and then Is_Predefined_Dispatching_Operation (Node (Prim_A_Elmt)) 9155 loop 9156 Next_Elmt (Prim_A_Elmt); 9157 end loop; 9158 9159 exit when No (Prim_G_Elmt) or else No (Prim_A_Elmt); 9160 9161 Prim_G := Node (Prim_G_Elmt); 9162 Prim_A := Node (Prim_A_Elmt); 9163 9164 -- There is no need to handle interface primitives because their 9165 -- primitives are not hidden 9166 9167 exit when Present (Interface_Alias (Prim_G)); 9168 9169 -- Here we install one hidden primitive 9170 9171 if Chars (Prim_G) /= Chars (Prim_A) 9172 and then Has_Suffix (Prim_A, 'P') 9173 and then Remove_Suffix (Prim_A, 'P') = Chars (Prim_G) 9174 then 9175 Set_Chars (Prim_A, Chars (Prim_G)); 9176 Append_New_Elmt (Prim_A, To => List); 9177 end if; 9178 9179 Next_Elmt (Prim_A_Elmt); 9180 Next_Elmt (Prim_G_Elmt); 9181 end loop; 9182 9183 -- Append the elements to the list of temporarily visible primitives 9184 -- avoiding duplicates. 9185 9186 if Present (List) then 9187 if No (Prims_List) then 9188 Prims_List := New_Elmt_List; 9189 end if; 9190 9191 Elmt := First_Elmt (List); 9192 while Present (Elmt) loop 9193 Append_Unique_Elmt (Node (Elmt), Prims_List); 9194 Next_Elmt (Elmt); 9195 end loop; 9196 end if; 9197 end Install_Hidden_Primitives; 9198 9199 ------------------------------- 9200 -- Restore_Hidden_Primitives -- 9201 ------------------------------- 9202 9203 procedure Restore_Hidden_Primitives (Prims_List : in out Elist_Id) is 9204 Prim_Elmt : Elmt_Id; 9205 Prim : Node_Id; 9206 9207 begin 9208 if Prims_List /= No_Elist then 9209 Prim_Elmt := First_Elmt (Prims_List); 9210 while Present (Prim_Elmt) loop 9211 Prim := Node (Prim_Elmt); 9212 Set_Chars (Prim, Add_Suffix (Prim, 'P')); 9213 Next_Elmt (Prim_Elmt); 9214 end loop; 9215 9216 Prims_List := No_Elist; 9217 end if; 9218 end Restore_Hidden_Primitives; 9219 9220 -------------------------------- 9221 -- Instantiate_Formal_Package -- 9222 -------------------------------- 9223 9224 function Instantiate_Formal_Package 9225 (Formal : Node_Id; 9226 Actual : Node_Id; 9227 Analyzed_Formal : Node_Id) return List_Id 9228 is 9229 Loc : constant Source_Ptr := Sloc (Actual); 9230 Actual_Pack : Entity_Id; 9231 Formal_Pack : Entity_Id; 9232 Gen_Parent : Entity_Id; 9233 Decls : List_Id; 9234 Nod : Node_Id; 9235 Parent_Spec : Node_Id; 9236 9237 procedure Find_Matching_Actual 9238 (F : Node_Id; 9239 Act : in out Entity_Id); 9240 -- We need to associate each formal entity in the formal package with 9241 -- the corresponding entity in the actual package. The actual package 9242 -- has been analyzed and possibly expanded, and as a result there is 9243 -- no one-to-one correspondence between the two lists (for example, 9244 -- the actual may include subtypes, itypes, and inherited primitive 9245 -- operations, interspersed among the renaming declarations for the 9246 -- actuals) . We retrieve the corresponding actual by name because each 9247 -- actual has the same name as the formal, and they do appear in the 9248 -- same order. 9249 9250 function Get_Formal_Entity (N : Node_Id) return Entity_Id; 9251 -- Retrieve entity of defining entity of generic formal parameter. 9252 -- Only the declarations of formals need to be considered when 9253 -- linking them to actuals, but the declarative list may include 9254 -- internal entities generated during analysis, and those are ignored. 9255 9256 procedure Match_Formal_Entity 9257 (Formal_Node : Node_Id; 9258 Formal_Ent : Entity_Id; 9259 Actual_Ent : Entity_Id); 9260 -- Associates the formal entity with the actual. In the case where 9261 -- Formal_Ent is a formal package, this procedure iterates through all 9262 -- of its formals and enters associations between the actuals occurring 9263 -- in the formal package's corresponding actual package (given by 9264 -- Actual_Ent) and the formal package's formal parameters. This 9265 -- procedure recurses if any of the parameters is itself a package. 9266 9267 function Is_Instance_Of 9268 (Act_Spec : Entity_Id; 9269 Gen_Anc : Entity_Id) return Boolean; 9270 -- The actual can be an instantiation of a generic within another 9271 -- instance, in which case there is no direct link from it to the 9272 -- original generic ancestor. In that case, we recognize that the 9273 -- ultimate ancestor is the same by examining names and scopes. 9274 9275 procedure Process_Nested_Formal (Formal : Entity_Id); 9276 -- If the current formal is declared with a box, its own formals are 9277 -- visible in the instance, as they were in the generic, and their 9278 -- Hidden flag must be reset. If some of these formals are themselves 9279 -- packages declared with a box, the processing must be recursive. 9280 9281 -------------------------- 9282 -- Find_Matching_Actual -- 9283 -------------------------- 9284 9285 procedure Find_Matching_Actual 9286 (F : Node_Id; 9287 Act : in out Entity_Id) 9288 is 9289 Formal_Ent : Entity_Id; 9290 9291 begin 9292 case Nkind (Original_Node (F)) is 9293 when N_Formal_Object_Declaration | 9294 N_Formal_Type_Declaration => 9295 Formal_Ent := Defining_Identifier (F); 9296 9297 while Chars (Act) /= Chars (Formal_Ent) loop 9298 Next_Entity (Act); 9299 end loop; 9300 9301 when N_Formal_Subprogram_Declaration | 9302 N_Formal_Package_Declaration | 9303 N_Package_Declaration | 9304 N_Generic_Package_Declaration => 9305 Formal_Ent := Defining_Entity (F); 9306 9307 while Chars (Act) /= Chars (Formal_Ent) loop 9308 Next_Entity (Act); 9309 end loop; 9310 9311 when others => 9312 raise Program_Error; 9313 end case; 9314 end Find_Matching_Actual; 9315 9316 ------------------------- 9317 -- Match_Formal_Entity -- 9318 ------------------------- 9319 9320 procedure Match_Formal_Entity 9321 (Formal_Node : Node_Id; 9322 Formal_Ent : Entity_Id; 9323 Actual_Ent : Entity_Id) 9324 is 9325 Act_Pkg : Entity_Id; 9326 9327 begin 9328 Set_Instance_Of (Formal_Ent, Actual_Ent); 9329 9330 if Ekind (Actual_Ent) = E_Package then 9331 9332 -- Record associations for each parameter 9333 9334 Act_Pkg := Actual_Ent; 9335 9336 declare 9337 A_Ent : Entity_Id := First_Entity (Act_Pkg); 9338 F_Ent : Entity_Id; 9339 F_Node : Node_Id; 9340 9341 Gen_Decl : Node_Id; 9342 Formals : List_Id; 9343 Actual : Entity_Id; 9344 9345 begin 9346 -- Retrieve the actual given in the formal package declaration 9347 9348 Actual := Entity (Name (Original_Node (Formal_Node))); 9349 9350 -- The actual in the formal package declaration may be a 9351 -- renamed generic package, in which case we want to retrieve 9352 -- the original generic in order to traverse its formal part. 9353 9354 if Present (Renamed_Entity (Actual)) then 9355 Gen_Decl := Unit_Declaration_Node (Renamed_Entity (Actual)); 9356 else 9357 Gen_Decl := Unit_Declaration_Node (Actual); 9358 end if; 9359 9360 Formals := Generic_Formal_Declarations (Gen_Decl); 9361 9362 if Present (Formals) then 9363 F_Node := First_Non_Pragma (Formals); 9364 else 9365 F_Node := Empty; 9366 end if; 9367 9368 while Present (A_Ent) 9369 and then Present (F_Node) 9370 and then A_Ent /= First_Private_Entity (Act_Pkg) 9371 loop 9372 F_Ent := Get_Formal_Entity (F_Node); 9373 9374 if Present (F_Ent) then 9375 9376 -- This is a formal of the original package. Record 9377 -- association and recurse. 9378 9379 Find_Matching_Actual (F_Node, A_Ent); 9380 Match_Formal_Entity (F_Node, F_Ent, A_Ent); 9381 Next_Entity (A_Ent); 9382 end if; 9383 9384 Next_Non_Pragma (F_Node); 9385 end loop; 9386 end; 9387 end if; 9388 end Match_Formal_Entity; 9389 9390 ----------------------- 9391 -- Get_Formal_Entity -- 9392 ----------------------- 9393 9394 function Get_Formal_Entity (N : Node_Id) return Entity_Id is 9395 Kind : constant Node_Kind := Nkind (Original_Node (N)); 9396 begin 9397 case Kind is 9398 when N_Formal_Object_Declaration => 9399 return Defining_Identifier (N); 9400 9401 when N_Formal_Type_Declaration => 9402 return Defining_Identifier (N); 9403 9404 when N_Formal_Subprogram_Declaration => 9405 return Defining_Unit_Name (Specification (N)); 9406 9407 when N_Formal_Package_Declaration => 9408 return Defining_Identifier (Original_Node (N)); 9409 9410 when N_Generic_Package_Declaration => 9411 return Defining_Identifier (Original_Node (N)); 9412 9413 -- All other declarations are introduced by semantic analysis and 9414 -- have no match in the actual. 9415 9416 when others => 9417 return Empty; 9418 end case; 9419 end Get_Formal_Entity; 9420 9421 -------------------- 9422 -- Is_Instance_Of -- 9423 -------------------- 9424 9425 function Is_Instance_Of 9426 (Act_Spec : Entity_Id; 9427 Gen_Anc : Entity_Id) return Boolean 9428 is 9429 Gen_Par : constant Entity_Id := Generic_Parent (Act_Spec); 9430 9431 begin 9432 if No (Gen_Par) then 9433 return False; 9434 9435 -- Simplest case: the generic parent of the actual is the formal 9436 9437 elsif Gen_Par = Gen_Anc then 9438 return True; 9439 9440 elsif Chars (Gen_Par) /= Chars (Gen_Anc) then 9441 return False; 9442 9443 -- The actual may be obtained through several instantiations. Its 9444 -- scope must itself be an instance of a generic declared in the 9445 -- same scope as the formal. Any other case is detected above. 9446 9447 elsif not Is_Generic_Instance (Scope (Gen_Par)) then 9448 return False; 9449 9450 else 9451 return Generic_Parent (Parent (Scope (Gen_Par))) = Scope (Gen_Anc); 9452 end if; 9453 end Is_Instance_Of; 9454 9455 --------------------------- 9456 -- Process_Nested_Formal -- 9457 --------------------------- 9458 9459 procedure Process_Nested_Formal (Formal : Entity_Id) is 9460 Ent : Entity_Id; 9461 9462 begin 9463 if Present (Associated_Formal_Package (Formal)) 9464 and then Box_Present (Parent (Associated_Formal_Package (Formal))) 9465 then 9466 Ent := First_Entity (Formal); 9467 while Present (Ent) loop 9468 Set_Is_Hidden (Ent, False); 9469 Set_Is_Visible_Formal (Ent); 9470 Set_Is_Potentially_Use_Visible 9471 (Ent, Is_Potentially_Use_Visible (Formal)); 9472 9473 if Ekind (Ent) = E_Package then 9474 exit when Renamed_Entity (Ent) = Renamed_Entity (Formal); 9475 Process_Nested_Formal (Ent); 9476 end if; 9477 9478 Next_Entity (Ent); 9479 end loop; 9480 end if; 9481 end Process_Nested_Formal; 9482 9483 -- Start of processing for Instantiate_Formal_Package 9484 9485 begin 9486 Analyze (Actual); 9487 9488 if not Is_Entity_Name (Actual) 9489 or else Ekind (Entity (Actual)) /= E_Package 9490 then 9491 Error_Msg_N 9492 ("expect package instance to instantiate formal", Actual); 9493 Abandon_Instantiation (Actual); 9494 raise Program_Error; 9495 9496 else 9497 Actual_Pack := Entity (Actual); 9498 Set_Is_Instantiated (Actual_Pack); 9499 9500 -- The actual may be a renamed package, or an outer generic formal 9501 -- package whose instantiation is converted into a renaming. 9502 9503 if Present (Renamed_Object (Actual_Pack)) then 9504 Actual_Pack := Renamed_Object (Actual_Pack); 9505 end if; 9506 9507 if Nkind (Analyzed_Formal) = N_Formal_Package_Declaration then 9508 Gen_Parent := Get_Instance_Of (Entity (Name (Analyzed_Formal))); 9509 Formal_Pack := Defining_Identifier (Analyzed_Formal); 9510 else 9511 Gen_Parent := 9512 Generic_Parent (Specification (Analyzed_Formal)); 9513 Formal_Pack := 9514 Defining_Unit_Name (Specification (Analyzed_Formal)); 9515 end if; 9516 9517 if Nkind (Parent (Actual_Pack)) = N_Defining_Program_Unit_Name then 9518 Parent_Spec := Package_Specification (Actual_Pack); 9519 else 9520 Parent_Spec := Parent (Actual_Pack); 9521 end if; 9522 9523 if Gen_Parent = Any_Id then 9524 Error_Msg_N 9525 ("previous error in declaration of formal package", Actual); 9526 Abandon_Instantiation (Actual); 9527 9528 elsif 9529 Is_Instance_Of (Parent_Spec, Get_Instance_Of (Gen_Parent)) 9530 then 9531 null; 9532 9533 else 9534 Error_Msg_NE 9535 ("actual parameter must be instance of&", Actual, Gen_Parent); 9536 Abandon_Instantiation (Actual); 9537 end if; 9538 9539 Set_Instance_Of (Defining_Identifier (Formal), Actual_Pack); 9540 Map_Formal_Package_Entities (Formal_Pack, Actual_Pack); 9541 9542 Nod := 9543 Make_Package_Renaming_Declaration (Loc, 9544 Defining_Unit_Name => New_Copy (Defining_Identifier (Formal)), 9545 Name => New_Occurrence_Of (Actual_Pack, Loc)); 9546 9547 Set_Associated_Formal_Package 9548 (Defining_Unit_Name (Nod), Defining_Identifier (Formal)); 9549 Decls := New_List (Nod); 9550 9551 -- If the formal F has a box, then the generic declarations are 9552 -- visible in the generic G. In an instance of G, the corresponding 9553 -- entities in the actual for F (which are the actuals for the 9554 -- instantiation of the generic that F denotes) must also be made 9555 -- visible for analysis of the current instance. On exit from the 9556 -- current instance, those entities are made private again. If the 9557 -- actual is currently in use, these entities are also use-visible. 9558 9559 -- The loop through the actual entities also steps through the formal 9560 -- entities and enters associations from formals to actuals into the 9561 -- renaming map. This is necessary to properly handle checking of 9562 -- actual parameter associations for later formals that depend on 9563 -- actuals declared in the formal package. 9564 9565 -- In Ada 2005, partial parameterization requires that we make 9566 -- visible the actuals corresponding to formals that were defaulted 9567 -- in the formal package. There formals are identified because they 9568 -- remain formal generics within the formal package, rather than 9569 -- being renamings of the actuals supplied. 9570 9571 declare 9572 Gen_Decl : constant Node_Id := 9573 Unit_Declaration_Node (Gen_Parent); 9574 Formals : constant List_Id := 9575 Generic_Formal_Declarations (Gen_Decl); 9576 9577 Actual_Ent : Entity_Id; 9578 Actual_Of_Formal : Node_Id; 9579 Formal_Node : Node_Id; 9580 Formal_Ent : Entity_Id; 9581 9582 begin 9583 if Present (Formals) then 9584 Formal_Node := First_Non_Pragma (Formals); 9585 else 9586 Formal_Node := Empty; 9587 end if; 9588 9589 Actual_Ent := First_Entity (Actual_Pack); 9590 Actual_Of_Formal := 9591 First (Visible_Declarations (Specification (Analyzed_Formal))); 9592 while Present (Actual_Ent) 9593 and then Actual_Ent /= First_Private_Entity (Actual_Pack) 9594 loop 9595 if Present (Formal_Node) then 9596 Formal_Ent := Get_Formal_Entity (Formal_Node); 9597 9598 if Present (Formal_Ent) then 9599 Find_Matching_Actual (Formal_Node, Actual_Ent); 9600 Match_Formal_Entity (Formal_Node, Formal_Ent, Actual_Ent); 9601 9602 -- We iterate at the same time over the actuals of the 9603 -- local package created for the formal, to determine 9604 -- which one of the formals of the original generic were 9605 -- defaulted in the formal. The corresponding actual 9606 -- entities are visible in the enclosing instance. 9607 9608 if Box_Present (Formal) 9609 or else 9610 (Present (Actual_Of_Formal) 9611 and then 9612 Is_Generic_Formal 9613 (Get_Formal_Entity (Actual_Of_Formal))) 9614 then 9615 Set_Is_Hidden (Actual_Ent, False); 9616 Set_Is_Visible_Formal (Actual_Ent); 9617 Set_Is_Potentially_Use_Visible 9618 (Actual_Ent, In_Use (Actual_Pack)); 9619 9620 if Ekind (Actual_Ent) = E_Package then 9621 Process_Nested_Formal (Actual_Ent); 9622 end if; 9623 9624 else 9625 Set_Is_Hidden (Actual_Ent); 9626 Set_Is_Potentially_Use_Visible (Actual_Ent, False); 9627 end if; 9628 end if; 9629 9630 Next_Non_Pragma (Formal_Node); 9631 Next (Actual_Of_Formal); 9632 9633 else 9634 -- No further formals to match, but the generic part may 9635 -- contain inherited operation that are not hidden in the 9636 -- enclosing instance. 9637 9638 Next_Entity (Actual_Ent); 9639 end if; 9640 end loop; 9641 9642 -- Inherited subprograms generated by formal derived types are 9643 -- also visible if the types are. 9644 9645 Actual_Ent := First_Entity (Actual_Pack); 9646 while Present (Actual_Ent) 9647 and then Actual_Ent /= First_Private_Entity (Actual_Pack) 9648 loop 9649 if Is_Overloadable (Actual_Ent) 9650 and then 9651 Nkind (Parent (Actual_Ent)) = N_Subtype_Declaration 9652 and then 9653 not Is_Hidden (Defining_Identifier (Parent (Actual_Ent))) 9654 then 9655 Set_Is_Hidden (Actual_Ent, False); 9656 Set_Is_Potentially_Use_Visible 9657 (Actual_Ent, In_Use (Actual_Pack)); 9658 end if; 9659 9660 Next_Entity (Actual_Ent); 9661 end loop; 9662 end; 9663 9664 -- If the formal is not declared with a box, reanalyze it as an 9665 -- abbreviated instantiation, to verify the matching rules of 12.7. 9666 -- The actual checks are performed after the generic associations 9667 -- have been analyzed, to guarantee the same visibility for this 9668 -- instantiation and for the actuals. 9669 9670 -- In Ada 2005, the generic associations for the formal can include 9671 -- defaulted parameters. These are ignored during check. This 9672 -- internal instantiation is removed from the tree after conformance 9673 -- checking, because it contains formal declarations for those 9674 -- defaulted parameters, and those should not reach the back-end. 9675 9676 if not Box_Present (Formal) then 9677 declare 9678 I_Pack : constant Entity_Id := 9679 Make_Temporary (Sloc (Actual), 'P'); 9680 9681 begin 9682 Set_Is_Internal (I_Pack); 9683 9684 Append_To (Decls, 9685 Make_Package_Instantiation (Sloc (Actual), 9686 Defining_Unit_Name => I_Pack, 9687 Name => 9688 New_Occurrence_Of 9689 (Get_Instance_Of (Gen_Parent), Sloc (Actual)), 9690 Generic_Associations => Generic_Associations (Formal))); 9691 end; 9692 end if; 9693 9694 return Decls; 9695 end if; 9696 end Instantiate_Formal_Package; 9697 9698 ----------------------------------- 9699 -- Instantiate_Formal_Subprogram -- 9700 ----------------------------------- 9701 9702 function Instantiate_Formal_Subprogram 9703 (Formal : Node_Id; 9704 Actual : Node_Id; 9705 Analyzed_Formal : Node_Id) return Node_Id 9706 is 9707 Analyzed_S : constant Entity_Id := 9708 Defining_Unit_Name (Specification (Analyzed_Formal)); 9709 Formal_Sub : constant Entity_Id := 9710 Defining_Unit_Name (Specification (Formal)); 9711 9712 function From_Parent_Scope (Subp : Entity_Id) return Boolean; 9713 -- If the generic is a child unit, the parent has been installed on the 9714 -- scope stack, but a default subprogram cannot resolve to something 9715 -- on the parent because that parent is not really part of the visible 9716 -- context (it is there to resolve explicit local entities). If the 9717 -- default has resolved in this way, we remove the entity from immediate 9718 -- visibility and analyze the node again to emit an error message or 9719 -- find another visible candidate. 9720 9721 procedure Valid_Actual_Subprogram (Act : Node_Id); 9722 -- Perform legality check and raise exception on failure 9723 9724 ----------------------- 9725 -- From_Parent_Scope -- 9726 ----------------------- 9727 9728 function From_Parent_Scope (Subp : Entity_Id) return Boolean is 9729 Gen_Scope : Node_Id; 9730 9731 begin 9732 Gen_Scope := Scope (Analyzed_S); 9733 while Present (Gen_Scope) and then Is_Child_Unit (Gen_Scope) loop 9734 if Scope (Subp) = Scope (Gen_Scope) then 9735 return True; 9736 end if; 9737 9738 Gen_Scope := Scope (Gen_Scope); 9739 end loop; 9740 9741 return False; 9742 end From_Parent_Scope; 9743 9744 ----------------------------- 9745 -- Valid_Actual_Subprogram -- 9746 ----------------------------- 9747 9748 procedure Valid_Actual_Subprogram (Act : Node_Id) is 9749 Act_E : Entity_Id; 9750 9751 begin 9752 if Is_Entity_Name (Act) then 9753 Act_E := Entity (Act); 9754 9755 elsif Nkind (Act) = N_Selected_Component 9756 and then Is_Entity_Name (Selector_Name (Act)) 9757 then 9758 Act_E := Entity (Selector_Name (Act)); 9759 9760 else 9761 Act_E := Empty; 9762 end if; 9763 9764 if (Present (Act_E) and then Is_Overloadable (Act_E)) 9765 or else Nkind_In (Act, N_Attribute_Reference, 9766 N_Indexed_Component, 9767 N_Character_Literal, 9768 N_Explicit_Dereference) 9769 then 9770 return; 9771 end if; 9772 9773 Error_Msg_NE 9774 ("expect subprogram or entry name in instantiation of &", 9775 Instantiation_Node, Formal_Sub); 9776 Abandon_Instantiation (Instantiation_Node); 9777 end Valid_Actual_Subprogram; 9778 9779 -- Local variables 9780 9781 Decl_Node : Node_Id; 9782 Loc : Source_Ptr; 9783 Nam : Node_Id; 9784 New_Spec : Node_Id; 9785 New_Subp : Entity_Id; 9786 9787 -- Start of processing for Instantiate_Formal_Subprogram 9788 9789 begin 9790 New_Spec := New_Copy_Tree (Specification (Formal)); 9791 9792 -- The tree copy has created the proper instantiation sloc for the 9793 -- new specification. Use this location for all other constructed 9794 -- declarations. 9795 9796 Loc := Sloc (Defining_Unit_Name (New_Spec)); 9797 9798 -- Create new entity for the actual (New_Copy_Tree does not), and 9799 -- indicate that it is an actual. 9800 9801 New_Subp := Make_Defining_Identifier (Loc, Chars (Formal_Sub)); 9802 Set_Ekind (New_Subp, Ekind (Analyzed_S)); 9803 Set_Is_Generic_Actual_Subprogram (New_Subp); 9804 Set_Defining_Unit_Name (New_Spec, New_Subp); 9805 9806 -- Create new entities for the each of the formals in the specification 9807 -- of the renaming declaration built for the actual. 9808 9809 if Present (Parameter_Specifications (New_Spec)) then 9810 declare 9811 F : Node_Id; 9812 F_Id : Entity_Id; 9813 9814 begin 9815 F := First (Parameter_Specifications (New_Spec)); 9816 while Present (F) loop 9817 F_Id := Defining_Identifier (F); 9818 9819 Set_Defining_Identifier (F, 9820 Make_Defining_Identifier (Sloc (F_Id), Chars (F_Id))); 9821 Next (F); 9822 end loop; 9823 end; 9824 end if; 9825 9826 -- Find entity of actual. If the actual is an attribute reference, it 9827 -- cannot be resolved here (its formal is missing) but is handled 9828 -- instead in Attribute_Renaming. If the actual is overloaded, it is 9829 -- fully resolved subsequently, when the renaming declaration for the 9830 -- formal is analyzed. If it is an explicit dereference, resolve the 9831 -- prefix but not the actual itself, to prevent interpretation as call. 9832 9833 if Present (Actual) then 9834 Loc := Sloc (Actual); 9835 Set_Sloc (New_Spec, Loc); 9836 9837 if Nkind (Actual) = N_Operator_Symbol then 9838 Find_Direct_Name (Actual); 9839 9840 elsif Nkind (Actual) = N_Explicit_Dereference then 9841 Analyze (Prefix (Actual)); 9842 9843 elsif Nkind (Actual) /= N_Attribute_Reference then 9844 Analyze (Actual); 9845 end if; 9846 9847 Valid_Actual_Subprogram (Actual); 9848 Nam := Actual; 9849 9850 elsif Present (Default_Name (Formal)) then 9851 if not Nkind_In (Default_Name (Formal), N_Attribute_Reference, 9852 N_Selected_Component, 9853 N_Indexed_Component, 9854 N_Character_Literal) 9855 and then Present (Entity (Default_Name (Formal))) 9856 then 9857 Nam := New_Occurrence_Of (Entity (Default_Name (Formal)), Loc); 9858 else 9859 Nam := New_Copy (Default_Name (Formal)); 9860 Set_Sloc (Nam, Loc); 9861 end if; 9862 9863 elsif Box_Present (Formal) then 9864 9865 -- Actual is resolved at the point of instantiation. Create an 9866 -- identifier or operator with the same name as the formal. 9867 9868 if Nkind (Formal_Sub) = N_Defining_Operator_Symbol then 9869 Nam := 9870 Make_Operator_Symbol (Loc, 9871 Chars => Chars (Formal_Sub), 9872 Strval => No_String); 9873 else 9874 Nam := Make_Identifier (Loc, Chars (Formal_Sub)); 9875 end if; 9876 9877 elsif Nkind (Specification (Formal)) = N_Procedure_Specification 9878 and then Null_Present (Specification (Formal)) 9879 then 9880 -- Generate null body for procedure, for use in the instance 9881 9882 Decl_Node := 9883 Make_Subprogram_Body (Loc, 9884 Specification => New_Spec, 9885 Declarations => New_List, 9886 Handled_Statement_Sequence => 9887 Make_Handled_Sequence_Of_Statements (Loc, 9888 Statements => New_List (Make_Null_Statement (Loc)))); 9889 9890 Set_Is_Intrinsic_Subprogram (Defining_Unit_Name (New_Spec)); 9891 return Decl_Node; 9892 9893 else 9894 Error_Msg_Sloc := Sloc (Scope (Analyzed_S)); 9895 Error_Msg_NE 9896 ("missing actual&", Instantiation_Node, Formal_Sub); 9897 Error_Msg_NE 9898 ("\in instantiation of & declared#", 9899 Instantiation_Node, Scope (Analyzed_S)); 9900 Abandon_Instantiation (Instantiation_Node); 9901 end if; 9902 9903 Decl_Node := 9904 Make_Subprogram_Renaming_Declaration (Loc, 9905 Specification => New_Spec, 9906 Name => Nam); 9907 9908 -- If we do not have an actual and the formal specified <> then set to 9909 -- get proper default. 9910 9911 if No (Actual) and then Box_Present (Formal) then 9912 Set_From_Default (Decl_Node); 9913 end if; 9914 9915 -- Gather possible interpretations for the actual before analyzing the 9916 -- instance. If overloaded, it will be resolved when analyzing the 9917 -- renaming declaration. 9918 9919 if Box_Present (Formal) and then No (Actual) then 9920 Analyze (Nam); 9921 9922 if Is_Child_Unit (Scope (Analyzed_S)) 9923 and then Present (Entity (Nam)) 9924 then 9925 if not Is_Overloaded (Nam) then 9926 if From_Parent_Scope (Entity (Nam)) then 9927 Set_Is_Immediately_Visible (Entity (Nam), False); 9928 Set_Entity (Nam, Empty); 9929 Set_Etype (Nam, Empty); 9930 9931 Analyze (Nam); 9932 Set_Is_Immediately_Visible (Entity (Nam)); 9933 end if; 9934 9935 else 9936 declare 9937 I : Interp_Index; 9938 It : Interp; 9939 9940 begin 9941 Get_First_Interp (Nam, I, It); 9942 while Present (It.Nam) loop 9943 if From_Parent_Scope (It.Nam) then 9944 Remove_Interp (I); 9945 end if; 9946 9947 Get_Next_Interp (I, It); 9948 end loop; 9949 end; 9950 end if; 9951 end if; 9952 end if; 9953 9954 -- The generic instantiation freezes the actual. This can only be done 9955 -- once the actual is resolved, in the analysis of the renaming 9956 -- declaration. To make the formal subprogram entity available, we set 9957 -- Corresponding_Formal_Spec to point to the formal subprogram entity. 9958 -- This is also needed in Analyze_Subprogram_Renaming for the processing 9959 -- of formal abstract subprograms. 9960 9961 Set_Corresponding_Formal_Spec (Decl_Node, Analyzed_S); 9962 9963 -- We cannot analyze the renaming declaration, and thus find the actual, 9964 -- until all the actuals are assembled in the instance. For subsequent 9965 -- checks of other actuals, indicate the node that will hold the 9966 -- instance of this formal. 9967 9968 Set_Instance_Of (Analyzed_S, Nam); 9969 9970 if Nkind (Actual) = N_Selected_Component 9971 and then Is_Task_Type (Etype (Prefix (Actual))) 9972 and then not Is_Frozen (Etype (Prefix (Actual))) 9973 then 9974 -- The renaming declaration will create a body, which must appear 9975 -- outside of the instantiation, We move the renaming declaration 9976 -- out of the instance, and create an additional renaming inside, 9977 -- to prevent freezing anomalies. 9978 9979 declare 9980 Anon_Id : constant Entity_Id := Make_Temporary (Loc, 'E'); 9981 9982 begin 9983 Set_Defining_Unit_Name (New_Spec, Anon_Id); 9984 Insert_Before (Instantiation_Node, Decl_Node); 9985 Analyze (Decl_Node); 9986 9987 -- Now create renaming within the instance 9988 9989 Decl_Node := 9990 Make_Subprogram_Renaming_Declaration (Loc, 9991 Specification => New_Copy_Tree (New_Spec), 9992 Name => New_Occurrence_Of (Anon_Id, Loc)); 9993 9994 Set_Defining_Unit_Name (Specification (Decl_Node), 9995 Make_Defining_Identifier (Loc, Chars (Formal_Sub))); 9996 end; 9997 end if; 9998 9999 return Decl_Node; 10000 end Instantiate_Formal_Subprogram; 10001 10002 ------------------------ 10003 -- Instantiate_Object -- 10004 ------------------------ 10005 10006 function Instantiate_Object 10007 (Formal : Node_Id; 10008 Actual : Node_Id; 10009 Analyzed_Formal : Node_Id) return List_Id 10010 is 10011 Gen_Obj : constant Entity_Id := Defining_Identifier (Formal); 10012 A_Gen_Obj : constant Entity_Id := 10013 Defining_Identifier (Analyzed_Formal); 10014 Acc_Def : Node_Id := Empty; 10015 Act_Assoc : constant Node_Id := Parent (Actual); 10016 Actual_Decl : Node_Id := Empty; 10017 Decl_Node : Node_Id; 10018 Def : Node_Id; 10019 Ftyp : Entity_Id; 10020 List : constant List_Id := New_List; 10021 Loc : constant Source_Ptr := Sloc (Actual); 10022 Orig_Ftyp : constant Entity_Id := Etype (A_Gen_Obj); 10023 Subt_Decl : Node_Id := Empty; 10024 Subt_Mark : Node_Id := Empty; 10025 10026 function Copy_Access_Def return Node_Id; 10027 -- If formal is an anonymous access, copy access definition of formal 10028 -- for generated object declaration. 10029 10030 --------------------- 10031 -- Copy_Access_Def -- 10032 --------------------- 10033 10034 function Copy_Access_Def return Node_Id is 10035 begin 10036 Def := New_Copy_Tree (Acc_Def); 10037 10038 -- In addition, if formal is an access to subprogram we need to 10039 -- generate new formals for the signature of the default, so that 10040 -- the tree is properly formatted for ASIS use. 10041 10042 if Present (Access_To_Subprogram_Definition (Acc_Def)) then 10043 declare 10044 Par_Spec : Node_Id; 10045 begin 10046 Par_Spec := 10047 First (Parameter_Specifications 10048 (Access_To_Subprogram_Definition (Def))); 10049 while Present (Par_Spec) loop 10050 Set_Defining_Identifier (Par_Spec, 10051 Make_Defining_Identifier (Sloc (Acc_Def), 10052 Chars => Chars (Defining_Identifier (Par_Spec)))); 10053 Next (Par_Spec); 10054 end loop; 10055 end; 10056 end if; 10057 10058 return Def; 10059 end Copy_Access_Def; 10060 10061 -- Start of processing for Instantiate_Object 10062 10063 begin 10064 -- Formal may be an anonymous access 10065 10066 if Present (Subtype_Mark (Formal)) then 10067 Subt_Mark := Subtype_Mark (Formal); 10068 else 10069 Check_Access_Definition (Formal); 10070 Acc_Def := Access_Definition (Formal); 10071 end if; 10072 10073 -- Sloc for error message on missing actual 10074 10075 Error_Msg_Sloc := Sloc (Scope (A_Gen_Obj)); 10076 10077 if Get_Instance_Of (Gen_Obj) /= Gen_Obj then 10078 Error_Msg_N ("duplicate instantiation of generic parameter", Actual); 10079 end if; 10080 10081 Set_Parent (List, Parent (Actual)); 10082 10083 -- OUT present 10084 10085 if Out_Present (Formal) then 10086 10087 -- An IN OUT generic actual must be a name. The instantiation is a 10088 -- renaming declaration. The actual is the name being renamed. We 10089 -- use the actual directly, rather than a copy, because it is not 10090 -- used further in the list of actuals, and because a copy or a use 10091 -- of relocate_node is incorrect if the instance is nested within a 10092 -- generic. In order to simplify ASIS searches, the Generic_Parent 10093 -- field links the declaration to the generic association. 10094 10095 if No (Actual) then 10096 Error_Msg_NE 10097 ("missing actual &", 10098 Instantiation_Node, Gen_Obj); 10099 Error_Msg_NE 10100 ("\in instantiation of & declared#", 10101 Instantiation_Node, Scope (A_Gen_Obj)); 10102 Abandon_Instantiation (Instantiation_Node); 10103 end if; 10104 10105 if Present (Subt_Mark) then 10106 Decl_Node := 10107 Make_Object_Renaming_Declaration (Loc, 10108 Defining_Identifier => New_Copy (Gen_Obj), 10109 Subtype_Mark => New_Copy_Tree (Subt_Mark), 10110 Name => Actual); 10111 10112 else pragma Assert (Present (Acc_Def)); 10113 Decl_Node := 10114 Make_Object_Renaming_Declaration (Loc, 10115 Defining_Identifier => New_Copy (Gen_Obj), 10116 Access_Definition => New_Copy_Tree (Acc_Def), 10117 Name => Actual); 10118 end if; 10119 10120 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc); 10121 10122 -- The analysis of the actual may produce Insert_Action nodes, so 10123 -- the declaration must have a context in which to attach them. 10124 10125 Append (Decl_Node, List); 10126 Analyze (Actual); 10127 10128 -- Return if the analysis of the actual reported some error 10129 10130 if Etype (Actual) = Any_Type then 10131 return List; 10132 end if; 10133 10134 -- This check is performed here because Analyze_Object_Renaming will 10135 -- not check it when Comes_From_Source is False. Note though that the 10136 -- check for the actual being the name of an object will be performed 10137 -- in Analyze_Object_Renaming. 10138 10139 if Is_Object_Reference (Actual) 10140 and then Is_Dependent_Component_Of_Mutable_Object (Actual) 10141 then 10142 Error_Msg_N 10143 ("illegal discriminant-dependent component for in out parameter", 10144 Actual); 10145 end if; 10146 10147 -- The actual has to be resolved in order to check that it is a 10148 -- variable (due to cases such as F (1), where F returns access to 10149 -- an array, and for overloaded prefixes). 10150 10151 Ftyp := Get_Instance_Of (Etype (A_Gen_Obj)); 10152 10153 -- If the type of the formal is not itself a formal, and the current 10154 -- unit is a child unit, the formal type must be declared in a 10155 -- parent, and must be retrieved by visibility. 10156 10157 if Ftyp = Orig_Ftyp 10158 and then Is_Generic_Unit (Scope (Ftyp)) 10159 and then Is_Child_Unit (Scope (A_Gen_Obj)) 10160 then 10161 declare 10162 Temp : constant Node_Id := 10163 New_Copy_Tree (Subtype_Mark (Analyzed_Formal)); 10164 begin 10165 Set_Entity (Temp, Empty); 10166 Find_Type (Temp); 10167 Ftyp := Entity (Temp); 10168 end; 10169 end if; 10170 10171 if Is_Private_Type (Ftyp) 10172 and then not Is_Private_Type (Etype (Actual)) 10173 and then (Base_Type (Full_View (Ftyp)) = Base_Type (Etype (Actual)) 10174 or else Base_Type (Etype (Actual)) = Ftyp) 10175 then 10176 -- If the actual has the type of the full view of the formal, or 10177 -- else a non-private subtype of the formal, then the visibility 10178 -- of the formal type has changed. Add to the actuals a subtype 10179 -- declaration that will force the exchange of views in the body 10180 -- of the instance as well. 10181 10182 Subt_Decl := 10183 Make_Subtype_Declaration (Loc, 10184 Defining_Identifier => Make_Temporary (Loc, 'P'), 10185 Subtype_Indication => New_Occurrence_Of (Ftyp, Loc)); 10186 10187 Prepend (Subt_Decl, List); 10188 10189 Prepend_Elmt (Full_View (Ftyp), Exchanged_Views); 10190 Exchange_Declarations (Ftyp); 10191 end if; 10192 10193 Resolve (Actual, Ftyp); 10194 10195 if not Denotes_Variable (Actual) then 10196 Error_Msg_NE ("actual for& must be a variable", Actual, Gen_Obj); 10197 10198 elsif Base_Type (Ftyp) /= Base_Type (Etype (Actual)) then 10199 10200 -- Ada 2005 (AI-423): For a generic formal object of mode in out, 10201 -- the type of the actual shall resolve to a specific anonymous 10202 -- access type. 10203 10204 if Ada_Version < Ada_2005 10205 or else Ekind (Base_Type (Ftyp)) /= 10206 E_Anonymous_Access_Type 10207 or else Ekind (Base_Type (Etype (Actual))) /= 10208 E_Anonymous_Access_Type 10209 then 10210 Error_Msg_NE 10211 ("type of actual does not match type of&", Actual, Gen_Obj); 10212 end if; 10213 end if; 10214 10215 Note_Possible_Modification (Actual, Sure => True); 10216 10217 -- Check for instantiation of atomic/volatile actual for 10218 -- non-atomic/volatile formal (RM C.6 (12)). 10219 10220 if Is_Atomic_Object (Actual) and then not Is_Atomic (Orig_Ftyp) then 10221 Error_Msg_N 10222 ("cannot instantiate non-atomic formal object " 10223 & "with atomic actual", Actual); 10224 10225 elsif Is_Volatile_Object (Actual) and then not Is_Volatile (Orig_Ftyp) 10226 then 10227 Error_Msg_N 10228 ("cannot instantiate non-volatile formal object " 10229 & "with volatile actual", Actual); 10230 end if; 10231 10232 -- Formal in-parameter 10233 10234 else 10235 -- The instantiation of a generic formal in-parameter is constant 10236 -- declaration. The actual is the expression for that declaration. 10237 -- Its type is a full copy of the type of the formal. This may be 10238 -- an access to subprogram, for which we need to generate entities 10239 -- for the formals in the new signature. 10240 10241 if Present (Actual) then 10242 if Present (Subt_Mark) then 10243 Def := New_Copy_Tree (Subt_Mark); 10244 else pragma Assert (Present (Acc_Def)); 10245 Def := Copy_Access_Def; 10246 end if; 10247 10248 Decl_Node := 10249 Make_Object_Declaration (Loc, 10250 Defining_Identifier => New_Copy (Gen_Obj), 10251 Constant_Present => True, 10252 Null_Exclusion_Present => Null_Exclusion_Present (Formal), 10253 Object_Definition => Def, 10254 Expression => Actual); 10255 10256 Set_Corresponding_Generic_Association (Decl_Node, Act_Assoc); 10257 10258 -- A generic formal object of a tagged type is defined to be 10259 -- aliased so the new constant must also be treated as aliased. 10260 10261 if Is_Tagged_Type (Etype (A_Gen_Obj)) then 10262 Set_Aliased_Present (Decl_Node); 10263 end if; 10264 10265 Append (Decl_Node, List); 10266 10267 -- No need to repeat (pre-)analysis of some expression nodes 10268 -- already handled in Preanalyze_Actuals. 10269 10270 if Nkind (Actual) /= N_Allocator then 10271 Analyze (Actual); 10272 10273 -- Return if the analysis of the actual reported some error 10274 10275 if Etype (Actual) = Any_Type then 10276 return List; 10277 end if; 10278 end if; 10279 10280 declare 10281 Formal_Type : constant Entity_Id := Etype (A_Gen_Obj); 10282 Typ : Entity_Id; 10283 10284 begin 10285 Typ := Get_Instance_Of (Formal_Type); 10286 10287 -- If the actual appears in the current or an enclosing scope, 10288 -- use its type directly. This is relevant if it has an actual 10289 -- subtype that is distinct from its nominal one. This cannot 10290 -- be done in general because the type of the actual may 10291 -- depend on other actuals, and only be fully determined when 10292 -- the enclosing instance is analyzed. 10293 10294 if Present (Etype (Actual)) 10295 and then Is_Constr_Subt_For_U_Nominal (Etype (Actual)) 10296 then 10297 Freeze_Before (Instantiation_Node, Etype (Actual)); 10298 else 10299 Freeze_Before (Instantiation_Node, Typ); 10300 end if; 10301 10302 -- If the actual is an aggregate, perform name resolution on 10303 -- its components (the analysis of an aggregate does not do it) 10304 -- to capture local names that may be hidden if the generic is 10305 -- a child unit. 10306 10307 if Nkind (Actual) = N_Aggregate then 10308 Preanalyze_And_Resolve (Actual, Typ); 10309 end if; 10310 10311 if Is_Limited_Type (Typ) 10312 and then not OK_For_Limited_Init (Typ, Actual) 10313 then 10314 Error_Msg_N 10315 ("initialization not allowed for limited types", Actual); 10316 Explain_Limited_Type (Typ, Actual); 10317 end if; 10318 end; 10319 10320 elsif Present (Default_Expression (Formal)) then 10321 10322 -- Use default to construct declaration 10323 10324 if Present (Subt_Mark) then 10325 Def := New_Copy (Subt_Mark); 10326 else pragma Assert (Present (Acc_Def)); 10327 Def := Copy_Access_Def; 10328 end if; 10329 10330 Decl_Node := 10331 Make_Object_Declaration (Sloc (Formal), 10332 Defining_Identifier => New_Copy (Gen_Obj), 10333 Constant_Present => True, 10334 Null_Exclusion_Present => Null_Exclusion_Present (Formal), 10335 Object_Definition => Def, 10336 Expression => New_Copy_Tree 10337 (Default_Expression (Formal))); 10338 10339 Append (Decl_Node, List); 10340 Set_Analyzed (Expression (Decl_Node), False); 10341 10342 else 10343 Error_Msg_NE ("missing actual&", Instantiation_Node, Gen_Obj); 10344 Error_Msg_NE ("\in instantiation of & declared#", 10345 Instantiation_Node, Scope (A_Gen_Obj)); 10346 10347 if Is_Scalar_Type (Etype (A_Gen_Obj)) then 10348 10349 -- Create dummy constant declaration so that instance can be 10350 -- analyzed, to minimize cascaded visibility errors. 10351 10352 if Present (Subt_Mark) then 10353 Def := Subt_Mark; 10354 else pragma Assert (Present (Acc_Def)); 10355 Def := Acc_Def; 10356 end if; 10357 10358 Decl_Node := 10359 Make_Object_Declaration (Loc, 10360 Defining_Identifier => New_Copy (Gen_Obj), 10361 Constant_Present => True, 10362 Null_Exclusion_Present => Null_Exclusion_Present (Formal), 10363 Object_Definition => New_Copy (Def), 10364 Expression => 10365 Make_Attribute_Reference (Sloc (Gen_Obj), 10366 Attribute_Name => Name_First, 10367 Prefix => New_Copy (Def))); 10368 10369 Append (Decl_Node, List); 10370 10371 else 10372 Abandon_Instantiation (Instantiation_Node); 10373 end if; 10374 end if; 10375 end if; 10376 10377 if Nkind (Actual) in N_Has_Entity then 10378 Actual_Decl := Parent (Entity (Actual)); 10379 end if; 10380 10381 -- Ada 2005 (AI-423): For a formal object declaration with a null 10382 -- exclusion or an access definition that has a null exclusion: If the 10383 -- actual matching the formal object declaration denotes a generic 10384 -- formal object of another generic unit G, and the instantiation 10385 -- containing the actual occurs within the body of G or within the body 10386 -- of a generic unit declared within the declarative region of G, then 10387 -- the declaration of the formal object of G must have a null exclusion. 10388 -- Otherwise, the subtype of the actual matching the formal object 10389 -- declaration shall exclude null. 10390 10391 if Ada_Version >= Ada_2005 10392 and then Present (Actual_Decl) 10393 and then Nkind_In (Actual_Decl, N_Formal_Object_Declaration, 10394 N_Object_Declaration) 10395 and then Nkind (Analyzed_Formal) = N_Formal_Object_Declaration 10396 and then not Has_Null_Exclusion (Actual_Decl) 10397 and then Has_Null_Exclusion (Analyzed_Formal) 10398 then 10399 Error_Msg_Sloc := Sloc (Analyzed_Formal); 10400 Error_Msg_N 10401 ("actual must exclude null to match generic formal#", Actual); 10402 end if; 10403 10404 -- An effectively volatile object cannot be used as an actual in 10405 -- a generic instance. The following check is only relevant when 10406 -- SPARK_Mode is on as it is not a standard Ada legality rule. 10407 10408 if SPARK_Mode = On 10409 and then Present (Actual) 10410 and then Is_Effectively_Volatile_Object (Actual) 10411 then 10412 Error_Msg_N 10413 ("volatile object cannot act as actual in generic instantiation " 10414 & "(SPARK RM 7.1.3(8))", Actual); 10415 end if; 10416 10417 return List; 10418 end Instantiate_Object; 10419 10420 ------------------------------ 10421 -- Instantiate_Package_Body -- 10422 ------------------------------ 10423 10424 procedure Instantiate_Package_Body 10425 (Body_Info : Pending_Body_Info; 10426 Inlined_Body : Boolean := False; 10427 Body_Optional : Boolean := False) 10428 is 10429 Act_Decl : constant Node_Id := Body_Info.Act_Decl; 10430 Inst_Node : constant Node_Id := Body_Info.Inst_Node; 10431 Loc : constant Source_Ptr := Sloc (Inst_Node); 10432 10433 Gen_Id : constant Node_Id := Name (Inst_Node); 10434 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node); 10435 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit); 10436 Act_Spec : constant Node_Id := Specification (Act_Decl); 10437 Act_Decl_Id : constant Entity_Id := Defining_Entity (Act_Spec); 10438 10439 Act_Body_Name : Node_Id; 10440 Gen_Body : Node_Id; 10441 Gen_Body_Id : Node_Id; 10442 Act_Body : Node_Id; 10443 Act_Body_Id : Entity_Id; 10444 10445 Parent_Installed : Boolean := False; 10446 Save_Style_Check : constant Boolean := Style_Check; 10447 10448 Par_Ent : Entity_Id := Empty; 10449 Par_Vis : Boolean := False; 10450 10451 Vis_Prims_List : Elist_Id := No_Elist; 10452 -- List of primitives made temporarily visible in the instantiation 10453 -- to match the visibility of the formal type 10454 10455 procedure Check_Initialized_Types; 10456 -- In a generic package body, an entity of a generic private type may 10457 -- appear uninitialized. This is suspicious, unless the actual is a 10458 -- fully initialized type. 10459 10460 ----------------------------- 10461 -- Check_Initialized_Types -- 10462 ----------------------------- 10463 10464 procedure Check_Initialized_Types is 10465 Decl : Node_Id; 10466 Formal : Entity_Id; 10467 Actual : Entity_Id; 10468 Uninit_Var : Entity_Id; 10469 10470 begin 10471 Decl := First (Generic_Formal_Declarations (Gen_Decl)); 10472 while Present (Decl) loop 10473 Uninit_Var := Empty; 10474 10475 if Nkind (Decl) = N_Private_Extension_Declaration then 10476 Uninit_Var := Uninitialized_Variable (Decl); 10477 10478 elsif Nkind (Decl) = N_Formal_Type_Declaration 10479 and then Nkind (Formal_Type_Definition (Decl)) = 10480 N_Formal_Private_Type_Definition 10481 then 10482 Uninit_Var := 10483 Uninitialized_Variable (Formal_Type_Definition (Decl)); 10484 end if; 10485 10486 if Present (Uninit_Var) then 10487 Formal := Defining_Identifier (Decl); 10488 Actual := First_Entity (Act_Decl_Id); 10489 10490 -- For each formal there is a subtype declaration that renames 10491 -- the actual and has the same name as the formal. Locate the 10492 -- formal for warning message about uninitialized variables 10493 -- in the generic, for which the actual type should be a fully 10494 -- initialized type. 10495 10496 while Present (Actual) loop 10497 exit when Ekind (Actual) = E_Package 10498 and then Present (Renamed_Object (Actual)); 10499 10500 if Chars (Actual) = Chars (Formal) 10501 and then not Is_Scalar_Type (Actual) 10502 and then not Is_Fully_Initialized_Type (Actual) 10503 and then Warn_On_No_Value_Assigned 10504 then 10505 Error_Msg_Node_2 := Formal; 10506 Error_Msg_NE 10507 ("generic unit has uninitialized variable& of " 10508 & "formal private type &?v?", Actual, Uninit_Var); 10509 Error_Msg_NE 10510 ("actual type for& should be fully initialized type?v?", 10511 Actual, Formal); 10512 exit; 10513 end if; 10514 10515 Next_Entity (Actual); 10516 end loop; 10517 end if; 10518 10519 Next (Decl); 10520 end loop; 10521 end Check_Initialized_Types; 10522 10523 -- Start of processing for Instantiate_Package_Body 10524 10525 begin 10526 Gen_Body_Id := Corresponding_Body (Gen_Decl); 10527 10528 -- The instance body may already have been processed, as the parent of 10529 -- another instance that is inlined (Load_Parent_Of_Generic). 10530 10531 if Present (Corresponding_Body (Instance_Spec (Inst_Node))) then 10532 return; 10533 end if; 10534 10535 Expander_Mode_Save_And_Set (Body_Info.Expander_Status); 10536 10537 -- Re-establish the state of information on which checks are suppressed. 10538 -- This information was set in Body_Info at the point of instantiation, 10539 -- and now we restore it so that the instance is compiled using the 10540 -- check status at the instantiation (RM 11.5 (7.2/2), AI95-00224-01). 10541 10542 Local_Suppress_Stack_Top := Body_Info.Local_Suppress_Stack_Top; 10543 Scope_Suppress := Body_Info.Scope_Suppress; 10544 Opt.Ada_Version := Body_Info.Version; 10545 Opt.Ada_Version_Pragma := Body_Info.Version_Pragma; 10546 Restore_Warnings (Body_Info.Warnings); 10547 Opt.SPARK_Mode := Body_Info.SPARK_Mode; 10548 Opt.SPARK_Mode_Pragma := Body_Info.SPARK_Mode_Pragma; 10549 10550 if No (Gen_Body_Id) then 10551 10552 -- Do not look for parent of generic body if none is required. 10553 -- This may happen when the routine is called as part of the 10554 -- Pending_Instantiations processing, when nested instances 10555 -- may precede the one generated from the main unit. 10556 10557 if not Unit_Requires_Body (Defining_Entity (Gen_Decl)) 10558 and then Body_Optional 10559 then 10560 return; 10561 else 10562 Load_Parent_Of_Generic 10563 (Inst_Node, Specification (Gen_Decl), Body_Optional); 10564 Gen_Body_Id := Corresponding_Body (Gen_Decl); 10565 end if; 10566 end if; 10567 10568 -- Establish global variable for sloc adjustment and for error recovery 10569 10570 Instantiation_Node := Inst_Node; 10571 10572 if Present (Gen_Body_Id) then 10573 Save_Env (Gen_Unit, Act_Decl_Id); 10574 Style_Check := False; 10575 Current_Sem_Unit := Body_Info.Current_Sem_Unit; 10576 10577 Gen_Body := Unit_Declaration_Node (Gen_Body_Id); 10578 10579 Create_Instantiation_Source 10580 (Inst_Node, Gen_Body_Id, False, S_Adjustment); 10581 10582 Act_Body := 10583 Copy_Generic_Node 10584 (Original_Node (Gen_Body), Empty, Instantiating => True); 10585 10586 -- Build new name (possibly qualified) for body declaration 10587 10588 Act_Body_Id := New_Copy (Act_Decl_Id); 10589 10590 -- Some attributes of spec entity are not inherited by body entity 10591 10592 Set_Handler_Records (Act_Body_Id, No_List); 10593 10594 if Nkind (Defining_Unit_Name (Act_Spec)) = 10595 N_Defining_Program_Unit_Name 10596 then 10597 Act_Body_Name := 10598 Make_Defining_Program_Unit_Name (Loc, 10599 Name => New_Copy_Tree (Name (Defining_Unit_Name (Act_Spec))), 10600 Defining_Identifier => Act_Body_Id); 10601 else 10602 Act_Body_Name := Act_Body_Id; 10603 end if; 10604 10605 Set_Defining_Unit_Name (Act_Body, Act_Body_Name); 10606 10607 Set_Corresponding_Spec (Act_Body, Act_Decl_Id); 10608 Check_Generic_Actuals (Act_Decl_Id, False); 10609 Check_Initialized_Types; 10610 10611 -- Install primitives hidden at the point of the instantiation but 10612 -- visible when processing the generic formals 10613 10614 declare 10615 E : Entity_Id; 10616 10617 begin 10618 E := First_Entity (Act_Decl_Id); 10619 while Present (E) loop 10620 if Is_Type (E) 10621 and then Is_Generic_Actual_Type (E) 10622 and then Is_Tagged_Type (E) 10623 then 10624 Install_Hidden_Primitives 10625 (Prims_List => Vis_Prims_List, 10626 Gen_T => Generic_Parent_Type (Parent (E)), 10627 Act_T => E); 10628 end if; 10629 10630 Next_Entity (E); 10631 end loop; 10632 end; 10633 10634 -- If it is a child unit, make the parent instance (which is an 10635 -- instance of the parent of the generic) visible. The parent 10636 -- instance is the prefix of the name of the generic unit. 10637 10638 if Ekind (Scope (Gen_Unit)) = E_Generic_Package 10639 and then Nkind (Gen_Id) = N_Expanded_Name 10640 then 10641 Par_Ent := Entity (Prefix (Gen_Id)); 10642 Par_Vis := Is_Immediately_Visible (Par_Ent); 10643 Install_Parent (Par_Ent, In_Body => True); 10644 Parent_Installed := True; 10645 10646 elsif Is_Child_Unit (Gen_Unit) then 10647 Par_Ent := Scope (Gen_Unit); 10648 Par_Vis := Is_Immediately_Visible (Par_Ent); 10649 Install_Parent (Par_Ent, In_Body => True); 10650 Parent_Installed := True; 10651 end if; 10652 10653 -- If the instantiation is a library unit, and this is the main unit, 10654 -- then build the resulting compilation unit nodes for the instance. 10655 -- If this is a compilation unit but it is not the main unit, then it 10656 -- is the body of a unit in the context, that is being compiled 10657 -- because it is encloses some inlined unit or another generic unit 10658 -- being instantiated. In that case, this body is not part of the 10659 -- current compilation, and is not attached to the tree, but its 10660 -- parent must be set for analysis. 10661 10662 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then 10663 10664 -- Replace instance node with body of instance, and create new 10665 -- node for corresponding instance declaration. 10666 10667 Build_Instance_Compilation_Unit_Nodes 10668 (Inst_Node, Act_Body, Act_Decl); 10669 Analyze (Inst_Node); 10670 10671 if Parent (Inst_Node) = Cunit (Main_Unit) then 10672 10673 -- If the instance is a child unit itself, then set the scope 10674 -- of the expanded body to be the parent of the instantiation 10675 -- (ensuring that the fully qualified name will be generated 10676 -- for the elaboration subprogram). 10677 10678 if Nkind (Defining_Unit_Name (Act_Spec)) = 10679 N_Defining_Program_Unit_Name 10680 then 10681 Set_Scope (Defining_Entity (Inst_Node), Scope (Act_Decl_Id)); 10682 end if; 10683 end if; 10684 10685 -- Case where instantiation is not a library unit 10686 10687 else 10688 -- If this is an early instantiation, i.e. appears textually 10689 -- before the corresponding body and must be elaborated first, 10690 -- indicate that the body instance is to be delayed. 10691 10692 Install_Body (Act_Body, Inst_Node, Gen_Body, Gen_Decl); 10693 10694 -- Now analyze the body. We turn off all checks if this is an 10695 -- internal unit, since there is no reason to have checks on for 10696 -- any predefined run-time library code. All such code is designed 10697 -- to be compiled with checks off. 10698 10699 -- Note that we do NOT apply this criterion to children of GNAT 10700 -- The latter units must suppress checks explicitly if needed. 10701 10702 if Is_Predefined_File_Name 10703 (Unit_File_Name (Get_Source_Unit (Gen_Decl))) 10704 then 10705 Analyze (Act_Body, Suppress => All_Checks); 10706 else 10707 Analyze (Act_Body); 10708 end if; 10709 end if; 10710 10711 Inherit_Context (Gen_Body, Inst_Node); 10712 10713 -- Remove the parent instances if they have been placed on the scope 10714 -- stack to compile the body. 10715 10716 if Parent_Installed then 10717 Remove_Parent (In_Body => True); 10718 10719 -- Restore the previous visibility of the parent 10720 10721 Set_Is_Immediately_Visible (Par_Ent, Par_Vis); 10722 end if; 10723 10724 Restore_Hidden_Primitives (Vis_Prims_List); 10725 Restore_Private_Views (Act_Decl_Id); 10726 10727 -- Remove the current unit from visibility if this is an instance 10728 -- that is not elaborated on the fly for inlining purposes. 10729 10730 if not Inlined_Body then 10731 Set_Is_Immediately_Visible (Act_Decl_Id, False); 10732 end if; 10733 10734 Restore_Env; 10735 Style_Check := Save_Style_Check; 10736 10737 -- If we have no body, and the unit requires a body, then complain. This 10738 -- complaint is suppressed if we have detected other errors (since a 10739 -- common reason for missing the body is that it had errors). 10740 -- In CodePeer mode, a warning has been emitted already, no need for 10741 -- further messages. 10742 10743 elsif Unit_Requires_Body (Gen_Unit) 10744 and then not Body_Optional 10745 then 10746 if CodePeer_Mode then 10747 null; 10748 10749 elsif Serious_Errors_Detected = 0 then 10750 Error_Msg_NE 10751 ("cannot find body of generic package &", Inst_Node, Gen_Unit); 10752 10753 -- Don't attempt to perform any cleanup actions if some other error 10754 -- was already detected, since this can cause blowups. 10755 10756 else 10757 return; 10758 end if; 10759 10760 -- Case of package that does not need a body 10761 10762 else 10763 -- If the instantiation of the declaration is a library unit, rewrite 10764 -- the original package instantiation as a package declaration in the 10765 -- compilation unit node. 10766 10767 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then 10768 Set_Parent_Spec (Act_Decl, Parent_Spec (Inst_Node)); 10769 Rewrite (Inst_Node, Act_Decl); 10770 10771 -- Generate elaboration entity, in case spec has elaboration code. 10772 -- This cannot be done when the instance is analyzed, because it 10773 -- is not known yet whether the body exists. 10774 10775 Set_Elaboration_Entity_Required (Act_Decl_Id, False); 10776 Build_Elaboration_Entity (Parent (Inst_Node), Act_Decl_Id); 10777 10778 -- If the instantiation is not a library unit, then append the 10779 -- declaration to the list of implicitly generated entities, unless 10780 -- it is already a list member which means that it was already 10781 -- processed 10782 10783 elsif not Is_List_Member (Act_Decl) then 10784 Mark_Rewrite_Insertion (Act_Decl); 10785 Insert_Before (Inst_Node, Act_Decl); 10786 end if; 10787 end if; 10788 10789 Expander_Mode_Restore; 10790 end Instantiate_Package_Body; 10791 10792 --------------------------------- 10793 -- Instantiate_Subprogram_Body -- 10794 --------------------------------- 10795 10796 procedure Instantiate_Subprogram_Body 10797 (Body_Info : Pending_Body_Info; 10798 Body_Optional : Boolean := False) 10799 is 10800 Act_Decl : constant Node_Id := Body_Info.Act_Decl; 10801 Inst_Node : constant Node_Id := Body_Info.Inst_Node; 10802 Loc : constant Source_Ptr := Sloc (Inst_Node); 10803 Gen_Id : constant Node_Id := Name (Inst_Node); 10804 Gen_Unit : constant Entity_Id := Get_Generic_Entity (Inst_Node); 10805 Gen_Decl : constant Node_Id := Unit_Declaration_Node (Gen_Unit); 10806 Anon_Id : constant Entity_Id := 10807 Defining_Unit_Name (Specification (Act_Decl)); 10808 Pack_Id : constant Entity_Id := 10809 Defining_Unit_Name (Parent (Act_Decl)); 10810 10811 Saved_Style_Check : constant Boolean := Style_Check; 10812 Saved_Warnings : constant Warning_Record := Save_Warnings; 10813 10814 Act_Body : Node_Id; 10815 Gen_Body : Node_Id; 10816 Gen_Body_Id : Node_Id; 10817 Pack_Body : Node_Id; 10818 Par_Ent : Entity_Id := Empty; 10819 Par_Vis : Boolean := False; 10820 Ret_Expr : Node_Id; 10821 10822 Parent_Installed : Boolean := False; 10823 10824 begin 10825 Gen_Body_Id := Corresponding_Body (Gen_Decl); 10826 10827 -- Subprogram body may have been created already because of an inline 10828 -- pragma, or because of multiple elaborations of the enclosing package 10829 -- when several instances of the subprogram appear in the main unit. 10830 10831 if Present (Corresponding_Body (Act_Decl)) then 10832 return; 10833 end if; 10834 10835 Expander_Mode_Save_And_Set (Body_Info.Expander_Status); 10836 10837 -- Re-establish the state of information on which checks are suppressed. 10838 -- This information was set in Body_Info at the point of instantiation, 10839 -- and now we restore it so that the instance is compiled using the 10840 -- check status at the instantiation (RM 11.5 (7.2/2), AI95-00224-01). 10841 10842 Local_Suppress_Stack_Top := Body_Info.Local_Suppress_Stack_Top; 10843 Scope_Suppress := Body_Info.Scope_Suppress; 10844 Opt.Ada_Version := Body_Info.Version; 10845 Opt.Ada_Version_Pragma := Body_Info.Version_Pragma; 10846 Restore_Warnings (Body_Info.Warnings); 10847 Opt.SPARK_Mode := Body_Info.SPARK_Mode; 10848 Opt.SPARK_Mode_Pragma := Body_Info.SPARK_Mode_Pragma; 10849 10850 if No (Gen_Body_Id) then 10851 10852 -- For imported generic subprogram, no body to compile, complete 10853 -- the spec entity appropriately. 10854 10855 if Is_Imported (Gen_Unit) then 10856 Set_Is_Imported (Anon_Id); 10857 Set_First_Rep_Item (Anon_Id, First_Rep_Item (Gen_Unit)); 10858 Set_Interface_Name (Anon_Id, Interface_Name (Gen_Unit)); 10859 Set_Convention (Anon_Id, Convention (Gen_Unit)); 10860 Set_Has_Completion (Anon_Id); 10861 return; 10862 10863 -- For other cases, compile the body 10864 10865 else 10866 Load_Parent_Of_Generic 10867 (Inst_Node, Specification (Gen_Decl), Body_Optional); 10868 Gen_Body_Id := Corresponding_Body (Gen_Decl); 10869 end if; 10870 end if; 10871 10872 Instantiation_Node := Inst_Node; 10873 10874 if Present (Gen_Body_Id) then 10875 Gen_Body := Unit_Declaration_Node (Gen_Body_Id); 10876 10877 if Nkind (Gen_Body) = N_Subprogram_Body_Stub then 10878 10879 -- Either body is not present, or context is non-expanding, as 10880 -- when compiling a subunit. Mark the instance as completed, and 10881 -- diagnose a missing body when needed. 10882 10883 if Expander_Active 10884 and then Operating_Mode = Generate_Code 10885 then 10886 Error_Msg_N 10887 ("missing proper body for instantiation", Gen_Body); 10888 end if; 10889 10890 Set_Has_Completion (Anon_Id); 10891 return; 10892 end if; 10893 10894 Save_Env (Gen_Unit, Anon_Id); 10895 Style_Check := False; 10896 Current_Sem_Unit := Body_Info.Current_Sem_Unit; 10897 Create_Instantiation_Source 10898 (Inst_Node, 10899 Gen_Body_Id, 10900 False, 10901 S_Adjustment); 10902 10903 Act_Body := 10904 Copy_Generic_Node 10905 (Original_Node (Gen_Body), Empty, Instantiating => True); 10906 10907 -- Create proper defining name for the body, to correspond to 10908 -- the one in the spec. 10909 10910 Set_Defining_Unit_Name (Specification (Act_Body), 10911 Make_Defining_Identifier 10912 (Sloc (Defining_Entity (Inst_Node)), Chars (Anon_Id))); 10913 Set_Corresponding_Spec (Act_Body, Anon_Id); 10914 Set_Has_Completion (Anon_Id); 10915 Check_Generic_Actuals (Pack_Id, False); 10916 10917 -- Generate a reference to link the visible subprogram instance to 10918 -- the generic body, which for navigation purposes is the only 10919 -- available source for the instance. 10920 10921 Generate_Reference 10922 (Related_Instance (Pack_Id), 10923 Gen_Body_Id, 'b', Set_Ref => False, Force => True); 10924 10925 -- If it is a child unit, make the parent instance (which is an 10926 -- instance of the parent of the generic) visible. The parent 10927 -- instance is the prefix of the name of the generic unit. 10928 10929 if Ekind (Scope (Gen_Unit)) = E_Generic_Package 10930 and then Nkind (Gen_Id) = N_Expanded_Name 10931 then 10932 Par_Ent := Entity (Prefix (Gen_Id)); 10933 Par_Vis := Is_Immediately_Visible (Par_Ent); 10934 Install_Parent (Par_Ent, In_Body => True); 10935 Parent_Installed := True; 10936 10937 elsif Is_Child_Unit (Gen_Unit) then 10938 Par_Ent := Scope (Gen_Unit); 10939 Par_Vis := Is_Immediately_Visible (Par_Ent); 10940 Install_Parent (Par_Ent, In_Body => True); 10941 Parent_Installed := True; 10942 end if; 10943 10944 -- Subprogram body is placed in the body of wrapper package, 10945 -- whose spec contains the subprogram declaration as well as 10946 -- the renaming declarations for the generic parameters. 10947 10948 Pack_Body := 10949 Make_Package_Body (Loc, 10950 Defining_Unit_Name => New_Copy (Pack_Id), 10951 Declarations => New_List (Act_Body)); 10952 10953 Set_Corresponding_Spec (Pack_Body, Pack_Id); 10954 10955 -- If the instantiation is a library unit, then build resulting 10956 -- compilation unit nodes for the instance. The declaration of 10957 -- the enclosing package is the grandparent of the subprogram 10958 -- declaration. First replace the instantiation node as the unit 10959 -- of the corresponding compilation. 10960 10961 if Nkind (Parent (Inst_Node)) = N_Compilation_Unit then 10962 if Parent (Inst_Node) = Cunit (Main_Unit) then 10963 Set_Unit (Parent (Inst_Node), Inst_Node); 10964 Build_Instance_Compilation_Unit_Nodes 10965 (Inst_Node, Pack_Body, Parent (Parent (Act_Decl))); 10966 Analyze (Inst_Node); 10967 else 10968 Set_Parent (Pack_Body, Parent (Inst_Node)); 10969 Analyze (Pack_Body); 10970 end if; 10971 10972 else 10973 Insert_Before (Inst_Node, Pack_Body); 10974 Mark_Rewrite_Insertion (Pack_Body); 10975 Analyze (Pack_Body); 10976 10977 if Expander_Active then 10978 Freeze_Subprogram_Body (Inst_Node, Gen_Body, Pack_Id); 10979 end if; 10980 end if; 10981 10982 Inherit_Context (Gen_Body, Inst_Node); 10983 10984 Restore_Private_Views (Pack_Id, False); 10985 10986 if Parent_Installed then 10987 Remove_Parent (In_Body => True); 10988 10989 -- Restore the previous visibility of the parent 10990 10991 Set_Is_Immediately_Visible (Par_Ent, Par_Vis); 10992 end if; 10993 10994 Restore_Env; 10995 Style_Check := Saved_Style_Check; 10996 Restore_Warnings (Saved_Warnings); 10997 10998 -- Body not found. Error was emitted already. If there were no previous 10999 -- errors, this may be an instance whose scope is a premature instance. 11000 -- In that case we must insure that the (legal) program does raise 11001 -- program error if executed. We generate a subprogram body for this 11002 -- purpose. See DEC ac30vso. 11003 11004 -- Should not reference proprietary DEC tests in comments ??? 11005 11006 elsif Serious_Errors_Detected = 0 11007 and then Nkind (Parent (Inst_Node)) /= N_Compilation_Unit 11008 then 11009 if Body_Optional then 11010 return; 11011 11012 elsif Ekind (Anon_Id) = E_Procedure then 11013 Act_Body := 11014 Make_Subprogram_Body (Loc, 11015 Specification => 11016 Make_Procedure_Specification (Loc, 11017 Defining_Unit_Name => 11018 Make_Defining_Identifier (Loc, Chars (Anon_Id)), 11019 Parameter_Specifications => 11020 New_Copy_List 11021 (Parameter_Specifications (Parent (Anon_Id)))), 11022 11023 Declarations => Empty_List, 11024 Handled_Statement_Sequence => 11025 Make_Handled_Sequence_Of_Statements (Loc, 11026 Statements => 11027 New_List ( 11028 Make_Raise_Program_Error (Loc, 11029 Reason => 11030 PE_Access_Before_Elaboration)))); 11031 11032 else 11033 Ret_Expr := 11034 Make_Raise_Program_Error (Loc, 11035 Reason => PE_Access_Before_Elaboration); 11036 11037 Set_Etype (Ret_Expr, (Etype (Anon_Id))); 11038 Set_Analyzed (Ret_Expr); 11039 11040 Act_Body := 11041 Make_Subprogram_Body (Loc, 11042 Specification => 11043 Make_Function_Specification (Loc, 11044 Defining_Unit_Name => 11045 Make_Defining_Identifier (Loc, Chars (Anon_Id)), 11046 Parameter_Specifications => 11047 New_Copy_List 11048 (Parameter_Specifications (Parent (Anon_Id))), 11049 Result_Definition => 11050 New_Occurrence_Of (Etype (Anon_Id), Loc)), 11051 11052 Declarations => Empty_List, 11053 Handled_Statement_Sequence => 11054 Make_Handled_Sequence_Of_Statements (Loc, 11055 Statements => 11056 New_List 11057 (Make_Simple_Return_Statement (Loc, Ret_Expr)))); 11058 end if; 11059 11060 Pack_Body := Make_Package_Body (Loc, 11061 Defining_Unit_Name => New_Copy (Pack_Id), 11062 Declarations => New_List (Act_Body)); 11063 11064 Insert_After (Inst_Node, Pack_Body); 11065 Set_Corresponding_Spec (Pack_Body, Pack_Id); 11066 Analyze (Pack_Body); 11067 end if; 11068 11069 Expander_Mode_Restore; 11070 end Instantiate_Subprogram_Body; 11071 11072 ---------------------- 11073 -- Instantiate_Type -- 11074 ---------------------- 11075 11076 function Instantiate_Type 11077 (Formal : Node_Id; 11078 Actual : Node_Id; 11079 Analyzed_Formal : Node_Id; 11080 Actual_Decls : List_Id) return List_Id 11081 is 11082 Gen_T : constant Entity_Id := Defining_Identifier (Formal); 11083 A_Gen_T : constant Entity_Id := 11084 Defining_Identifier (Analyzed_Formal); 11085 Ancestor : Entity_Id := Empty; 11086 Def : constant Node_Id := Formal_Type_Definition (Formal); 11087 Act_T : Entity_Id; 11088 Decl_Node : Node_Id; 11089 Decl_Nodes : List_Id; 11090 Loc : Source_Ptr; 11091 Subt : Entity_Id; 11092 11093 procedure Diagnose_Predicated_Actual; 11094 -- There are a number of constructs in which a discrete type with 11095 -- predicates is illegal, e.g. as an index in an array type declaration. 11096 -- If a generic type is used is such a construct in a generic package 11097 -- declaration, it carries the flag No_Predicate_On_Actual. it is part 11098 -- of the generic contract that the actual cannot have predicates. 11099 11100 procedure Validate_Array_Type_Instance; 11101 procedure Validate_Access_Subprogram_Instance; 11102 procedure Validate_Access_Type_Instance; 11103 procedure Validate_Derived_Type_Instance; 11104 procedure Validate_Derived_Interface_Type_Instance; 11105 procedure Validate_Discriminated_Formal_Type; 11106 procedure Validate_Interface_Type_Instance; 11107 procedure Validate_Private_Type_Instance; 11108 procedure Validate_Incomplete_Type_Instance; 11109 -- These procedures perform validation tests for the named case. 11110 -- Validate_Discriminated_Formal_Type is shared by formal private 11111 -- types and Ada 2012 formal incomplete types. 11112 11113 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean; 11114 -- Check that base types are the same and that the subtypes match 11115 -- statically. Used in several of the above. 11116 11117 --------------------------------- 11118 -- Diagnose_Predicated_Actual -- 11119 --------------------------------- 11120 11121 procedure Diagnose_Predicated_Actual is 11122 begin 11123 if No_Predicate_On_Actual (A_Gen_T) 11124 and then Has_Predicates (Act_T) 11125 then 11126 Error_Msg_NE 11127 ("actual for& cannot be a type with predicate", 11128 Instantiation_Node, A_Gen_T); 11129 11130 elsif No_Dynamic_Predicate_On_Actual (A_Gen_T) 11131 and then Has_Predicates (Act_T) 11132 and then not Has_Static_Predicate_Aspect (Act_T) 11133 then 11134 Error_Msg_NE 11135 ("actual for& cannot be a type with a dynamic predicate", 11136 Instantiation_Node, A_Gen_T); 11137 end if; 11138 end Diagnose_Predicated_Actual; 11139 11140 -------------------- 11141 -- Subtypes_Match -- 11142 -------------------- 11143 11144 function Subtypes_Match (Gen_T, Act_T : Entity_Id) return Boolean is 11145 T : constant Entity_Id := Get_Instance_Of (Gen_T); 11146 11147 begin 11148 -- Some detailed comments would be useful here ??? 11149 11150 return ((Base_Type (T) = Act_T 11151 or else Base_Type (T) = Base_Type (Act_T)) 11152 and then Subtypes_Statically_Match (T, Act_T)) 11153 11154 or else (Is_Class_Wide_Type (Gen_T) 11155 and then Is_Class_Wide_Type (Act_T) 11156 and then Subtypes_Match 11157 (Get_Instance_Of (Root_Type (Gen_T)), 11158 Root_Type (Act_T))) 11159 11160 or else 11161 (Ekind_In (Gen_T, E_Anonymous_Access_Subprogram_Type, 11162 E_Anonymous_Access_Type) 11163 and then Ekind (Act_T) = Ekind (Gen_T) 11164 and then Subtypes_Statically_Match 11165 (Designated_Type (Gen_T), Designated_Type (Act_T))); 11166 end Subtypes_Match; 11167 11168 ----------------------------------------- 11169 -- Validate_Access_Subprogram_Instance -- 11170 ----------------------------------------- 11171 11172 procedure Validate_Access_Subprogram_Instance is 11173 begin 11174 if not Is_Access_Type (Act_T) 11175 or else Ekind (Designated_Type (Act_T)) /= E_Subprogram_Type 11176 then 11177 Error_Msg_NE 11178 ("expect access type in instantiation of &", Actual, Gen_T); 11179 Abandon_Instantiation (Actual); 11180 end if; 11181 11182 -- According to AI05-288, actuals for access_to_subprograms must be 11183 -- subtype conformant with the generic formal. Previous to AI05-288 11184 -- only mode conformance was required. 11185 11186 -- This is a binding interpretation that applies to previous versions 11187 -- of the language, no need to maintain previous weaker checks. 11188 11189 Check_Subtype_Conformant 11190 (Designated_Type (Act_T), 11191 Designated_Type (A_Gen_T), 11192 Actual, 11193 Get_Inst => True); 11194 11195 if Ekind (Base_Type (Act_T)) = E_Access_Protected_Subprogram_Type then 11196 if Ekind (A_Gen_T) = E_Access_Subprogram_Type then 11197 Error_Msg_NE 11198 ("protected access type not allowed for formal &", 11199 Actual, Gen_T); 11200 end if; 11201 11202 elsif Ekind (A_Gen_T) = E_Access_Protected_Subprogram_Type then 11203 Error_Msg_NE 11204 ("expect protected access type for formal &", 11205 Actual, Gen_T); 11206 end if; 11207 11208 -- If the formal has a specified convention (which in most cases 11209 -- will be StdCall) verify that the actual has the same convention. 11210 11211 if Has_Convention_Pragma (A_Gen_T) 11212 and then Convention (A_Gen_T) /= Convention (Act_T) 11213 then 11214 Error_Msg_Name_1 := Get_Convention_Name (Convention (A_Gen_T)); 11215 Error_Msg_NE 11216 ("actual for formal & must have convention %", Actual, Gen_T); 11217 end if; 11218 end Validate_Access_Subprogram_Instance; 11219 11220 ----------------------------------- 11221 -- Validate_Access_Type_Instance -- 11222 ----------------------------------- 11223 11224 procedure Validate_Access_Type_Instance is 11225 Desig_Type : constant Entity_Id := 11226 Find_Actual_Type (Designated_Type (A_Gen_T), A_Gen_T); 11227 Desig_Act : Entity_Id; 11228 11229 begin 11230 if not Is_Access_Type (Act_T) then 11231 Error_Msg_NE 11232 ("expect access type in instantiation of &", Actual, Gen_T); 11233 Abandon_Instantiation (Actual); 11234 end if; 11235 11236 if Is_Access_Constant (A_Gen_T) then 11237 if not Is_Access_Constant (Act_T) then 11238 Error_Msg_N 11239 ("actual type must be access-to-constant type", Actual); 11240 Abandon_Instantiation (Actual); 11241 end if; 11242 else 11243 if Is_Access_Constant (Act_T) then 11244 Error_Msg_N 11245 ("actual type must be access-to-variable type", Actual); 11246 Abandon_Instantiation (Actual); 11247 11248 elsif Ekind (A_Gen_T) = E_General_Access_Type 11249 and then Ekind (Base_Type (Act_T)) /= E_General_Access_Type 11250 then 11251 Error_Msg_N -- CODEFIX 11252 ("actual must be general access type!", Actual); 11253 Error_Msg_NE -- CODEFIX 11254 ("add ALL to }!", Actual, Act_T); 11255 Abandon_Instantiation (Actual); 11256 end if; 11257 end if; 11258 11259 -- The designated subtypes, that is to say the subtypes introduced 11260 -- by an access type declaration (and not by a subtype declaration) 11261 -- must match. 11262 11263 Desig_Act := Designated_Type (Base_Type (Act_T)); 11264 11265 -- The designated type may have been introduced through a limited_ 11266 -- with clause, in which case retrieve the non-limited view. This 11267 -- applies to incomplete types as well as to class-wide types. 11268 11269 if From_Limited_With (Desig_Act) then 11270 Desig_Act := Available_View (Desig_Act); 11271 end if; 11272 11273 if not Subtypes_Match (Desig_Type, Desig_Act) then 11274 Error_Msg_NE 11275 ("designated type of actual does not match that of formal &", 11276 Actual, Gen_T); 11277 11278 if not Predicates_Match (Desig_Type, Desig_Act) then 11279 Error_Msg_N ("\predicates do not match", Actual); 11280 end if; 11281 11282 Abandon_Instantiation (Actual); 11283 11284 elsif Is_Access_Type (Designated_Type (Act_T)) 11285 and then Is_Constrained (Designated_Type (Designated_Type (Act_T))) 11286 /= 11287 Is_Constrained (Designated_Type (Desig_Type)) 11288 then 11289 Error_Msg_NE 11290 ("designated type of actual does not match that of formal &", 11291 Actual, Gen_T); 11292 11293 if not Predicates_Match (Desig_Type, Desig_Act) then 11294 Error_Msg_N ("\predicates do not match", Actual); 11295 end if; 11296 11297 Abandon_Instantiation (Actual); 11298 end if; 11299 11300 -- Ada 2005: null-exclusion indicators of the two types must agree 11301 11302 if Can_Never_Be_Null (A_Gen_T) /= Can_Never_Be_Null (Act_T) then 11303 Error_Msg_NE 11304 ("non null exclusion of actual and formal & do not match", 11305 Actual, Gen_T); 11306 end if; 11307 end Validate_Access_Type_Instance; 11308 11309 ---------------------------------- 11310 -- Validate_Array_Type_Instance -- 11311 ---------------------------------- 11312 11313 procedure Validate_Array_Type_Instance is 11314 I1 : Node_Id; 11315 I2 : Node_Id; 11316 T2 : Entity_Id; 11317 11318 function Formal_Dimensions return Int; 11319 -- Count number of dimensions in array type formal 11320 11321 ----------------------- 11322 -- Formal_Dimensions -- 11323 ----------------------- 11324 11325 function Formal_Dimensions return Int is 11326 Num : Int := 0; 11327 Index : Node_Id; 11328 11329 begin 11330 if Nkind (Def) = N_Constrained_Array_Definition then 11331 Index := First (Discrete_Subtype_Definitions (Def)); 11332 else 11333 Index := First (Subtype_Marks (Def)); 11334 end if; 11335 11336 while Present (Index) loop 11337 Num := Num + 1; 11338 Next_Index (Index); 11339 end loop; 11340 11341 return Num; 11342 end Formal_Dimensions; 11343 11344 -- Start of processing for Validate_Array_Type_Instance 11345 11346 begin 11347 if not Is_Array_Type (Act_T) then 11348 Error_Msg_NE 11349 ("expect array type in instantiation of &", Actual, Gen_T); 11350 Abandon_Instantiation (Actual); 11351 11352 elsif Nkind (Def) = N_Constrained_Array_Definition then 11353 if not (Is_Constrained (Act_T)) then 11354 Error_Msg_NE 11355 ("expect constrained array in instantiation of &", 11356 Actual, Gen_T); 11357 Abandon_Instantiation (Actual); 11358 end if; 11359 11360 else 11361 if Is_Constrained (Act_T) then 11362 Error_Msg_NE 11363 ("expect unconstrained array in instantiation of &", 11364 Actual, Gen_T); 11365 Abandon_Instantiation (Actual); 11366 end if; 11367 end if; 11368 11369 if Formal_Dimensions /= Number_Dimensions (Act_T) then 11370 Error_Msg_NE 11371 ("dimensions of actual do not match formal &", Actual, Gen_T); 11372 Abandon_Instantiation (Actual); 11373 end if; 11374 11375 I1 := First_Index (A_Gen_T); 11376 I2 := First_Index (Act_T); 11377 for J in 1 .. Formal_Dimensions loop 11378 11379 -- If the indexes of the actual were given by a subtype_mark, 11380 -- the index was transformed into a range attribute. Retrieve 11381 -- the original type mark for checking. 11382 11383 if Is_Entity_Name (Original_Node (I2)) then 11384 T2 := Entity (Original_Node (I2)); 11385 else 11386 T2 := Etype (I2); 11387 end if; 11388 11389 if not Subtypes_Match 11390 (Find_Actual_Type (Etype (I1), A_Gen_T), T2) 11391 then 11392 Error_Msg_NE 11393 ("index types of actual do not match those of formal &", 11394 Actual, Gen_T); 11395 Abandon_Instantiation (Actual); 11396 end if; 11397 11398 Next_Index (I1); 11399 Next_Index (I2); 11400 end loop; 11401 11402 -- Check matching subtypes. Note that there are complex visibility 11403 -- issues when the generic is a child unit and some aspect of the 11404 -- generic type is declared in a parent unit of the generic. We do 11405 -- the test to handle this special case only after a direct check 11406 -- for static matching has failed. The case where both the component 11407 -- type and the array type are separate formals, and the component 11408 -- type is a private view may also require special checking in 11409 -- Subtypes_Match. 11410 11411 if Subtypes_Match 11412 (Component_Type (A_Gen_T), Component_Type (Act_T)) 11413 or else 11414 Subtypes_Match 11415 (Find_Actual_Type (Component_Type (A_Gen_T), A_Gen_T), 11416 Component_Type (Act_T)) 11417 then 11418 null; 11419 else 11420 Error_Msg_NE 11421 ("component subtype of actual does not match that of formal &", 11422 Actual, Gen_T); 11423 Abandon_Instantiation (Actual); 11424 end if; 11425 11426 if Has_Aliased_Components (A_Gen_T) 11427 and then not Has_Aliased_Components (Act_T) 11428 then 11429 Error_Msg_NE 11430 ("actual must have aliased components to match formal type &", 11431 Actual, Gen_T); 11432 end if; 11433 end Validate_Array_Type_Instance; 11434 11435 ----------------------------------------------- 11436 -- Validate_Derived_Interface_Type_Instance -- 11437 ----------------------------------------------- 11438 11439 procedure Validate_Derived_Interface_Type_Instance is 11440 Par : constant Entity_Id := Entity (Subtype_Indication (Def)); 11441 Elmt : Elmt_Id; 11442 11443 begin 11444 -- First apply interface instance checks 11445 11446 Validate_Interface_Type_Instance; 11447 11448 -- Verify that immediate parent interface is an ancestor of 11449 -- the actual. 11450 11451 if Present (Par) 11452 and then not Interface_Present_In_Ancestor (Act_T, Par) 11453 then 11454 Error_Msg_NE 11455 ("interface actual must include progenitor&", Actual, Par); 11456 end if; 11457 11458 -- Now verify that the actual includes all other ancestors of 11459 -- the formal. 11460 11461 Elmt := First_Elmt (Interfaces (A_Gen_T)); 11462 while Present (Elmt) loop 11463 if not Interface_Present_In_Ancestor 11464 (Act_T, Get_Instance_Of (Node (Elmt))) 11465 then 11466 Error_Msg_NE 11467 ("interface actual must include progenitor&", 11468 Actual, Node (Elmt)); 11469 end if; 11470 11471 Next_Elmt (Elmt); 11472 end loop; 11473 end Validate_Derived_Interface_Type_Instance; 11474 11475 ------------------------------------ 11476 -- Validate_Derived_Type_Instance -- 11477 ------------------------------------ 11478 11479 procedure Validate_Derived_Type_Instance is 11480 Actual_Discr : Entity_Id; 11481 Ancestor_Discr : Entity_Id; 11482 11483 begin 11484 -- If the parent type in the generic declaration is itself a previous 11485 -- formal type, then it is local to the generic and absent from the 11486 -- analyzed generic definition. In that case the ancestor is the 11487 -- instance of the formal (which must have been instantiated 11488 -- previously), unless the ancestor is itself a formal derived type. 11489 -- In this latter case (which is the subject of Corrigendum 8652/0038 11490 -- (AI-202) the ancestor of the formals is the ancestor of its 11491 -- parent. Otherwise, the analyzed generic carries the parent type. 11492 -- If the parent type is defined in a previous formal package, then 11493 -- the scope of that formal package is that of the generic type 11494 -- itself, and it has already been mapped into the corresponding type 11495 -- in the actual package. 11496 11497 -- Common case: parent type defined outside of the generic 11498 11499 if Is_Entity_Name (Subtype_Mark (Def)) 11500 and then Present (Entity (Subtype_Mark (Def))) 11501 then 11502 Ancestor := Get_Instance_Of (Entity (Subtype_Mark (Def))); 11503 11504 -- Check whether parent is defined in a previous formal package 11505 11506 elsif 11507 Scope (Scope (Base_Type (Etype (A_Gen_T)))) = Scope (A_Gen_T) 11508 then 11509 Ancestor := 11510 Get_Instance_Of (Base_Type (Etype (A_Gen_T))); 11511 11512 -- The type may be a local derivation, or a type extension of a 11513 -- previous formal, or of a formal of a parent package. 11514 11515 elsif Is_Derived_Type (Get_Instance_Of (A_Gen_T)) 11516 or else 11517 Ekind (Get_Instance_Of (A_Gen_T)) = E_Record_Type_With_Private 11518 then 11519 -- Check whether the parent is another derived formal type in the 11520 -- same generic unit. 11521 11522 if Etype (A_Gen_T) /= A_Gen_T 11523 and then Is_Generic_Type (Etype (A_Gen_T)) 11524 and then Scope (Etype (A_Gen_T)) = Scope (A_Gen_T) 11525 and then Etype (Etype (A_Gen_T)) /= Etype (A_Gen_T) 11526 then 11527 -- Locate ancestor of parent from the subtype declaration 11528 -- created for the actual. 11529 11530 declare 11531 Decl : Node_Id; 11532 11533 begin 11534 Decl := First (Actual_Decls); 11535 while Present (Decl) loop 11536 if Nkind (Decl) = N_Subtype_Declaration 11537 and then Chars (Defining_Identifier (Decl)) = 11538 Chars (Etype (A_Gen_T)) 11539 then 11540 Ancestor := Generic_Parent_Type (Decl); 11541 exit; 11542 else 11543 Next (Decl); 11544 end if; 11545 end loop; 11546 end; 11547 11548 pragma Assert (Present (Ancestor)); 11549 11550 -- The ancestor itself may be a previous formal that has been 11551 -- instantiated. 11552 11553 Ancestor := Get_Instance_Of (Ancestor); 11554 11555 else 11556 Ancestor := 11557 Get_Instance_Of (Base_Type (Get_Instance_Of (A_Gen_T))); 11558 end if; 11559 11560 -- An unusual case: the actual is a type declared in a parent unit, 11561 -- but is not a formal type so there is no instance_of for it. 11562 -- Retrieve it by analyzing the record extension. 11563 11564 elsif Is_Child_Unit (Scope (A_Gen_T)) 11565 and then In_Open_Scopes (Scope (Act_T)) 11566 and then Is_Generic_Instance (Scope (Act_T)) 11567 then 11568 Analyze (Subtype_Mark (Def)); 11569 Ancestor := Entity (Subtype_Mark (Def)); 11570 11571 else 11572 Ancestor := Get_Instance_Of (Etype (Base_Type (A_Gen_T))); 11573 end if; 11574 11575 -- If the formal derived type has pragma Preelaborable_Initialization 11576 -- then the actual type must have preelaborable initialization. 11577 11578 if Known_To_Have_Preelab_Init (A_Gen_T) 11579 and then not Has_Preelaborable_Initialization (Act_T) 11580 then 11581 Error_Msg_NE 11582 ("actual for & must have preelaborable initialization", 11583 Actual, Gen_T); 11584 end if; 11585 11586 -- Ada 2005 (AI-251) 11587 11588 if Ada_Version >= Ada_2005 and then Is_Interface (Ancestor) then 11589 if not Interface_Present_In_Ancestor (Act_T, Ancestor) then 11590 Error_Msg_NE 11591 ("(Ada 2005) expected type implementing & in instantiation", 11592 Actual, Ancestor); 11593 end if; 11594 11595 elsif not Is_Ancestor (Base_Type (Ancestor), Act_T) then 11596 Error_Msg_NE 11597 ("expect type derived from & in instantiation", 11598 Actual, First_Subtype (Ancestor)); 11599 Abandon_Instantiation (Actual); 11600 end if; 11601 11602 -- Ada 2005 (AI-443): Synchronized formal derived type checks. Note 11603 -- that the formal type declaration has been rewritten as a private 11604 -- extension. 11605 11606 if Ada_Version >= Ada_2005 11607 and then Nkind (Parent (A_Gen_T)) = N_Private_Extension_Declaration 11608 and then Synchronized_Present (Parent (A_Gen_T)) 11609 then 11610 -- The actual must be a synchronized tagged type 11611 11612 if not Is_Tagged_Type (Act_T) then 11613 Error_Msg_N 11614 ("actual of synchronized type must be tagged", Actual); 11615 Abandon_Instantiation (Actual); 11616 11617 elsif Nkind (Parent (Act_T)) = N_Full_Type_Declaration 11618 and then Nkind (Type_Definition (Parent (Act_T))) = 11619 N_Derived_Type_Definition 11620 and then not Synchronized_Present 11621 (Type_Definition (Parent (Act_T))) 11622 then 11623 Error_Msg_N 11624 ("actual of synchronized type must be synchronized", Actual); 11625 Abandon_Instantiation (Actual); 11626 end if; 11627 end if; 11628 11629 -- Perform atomic/volatile checks (RM C.6(12)). Note that AI05-0218-1 11630 -- removes the second instance of the phrase "or allow pass by copy". 11631 11632 if Is_Atomic (Act_T) and then not Is_Atomic (Ancestor) then 11633 Error_Msg_N 11634 ("cannot have atomic actual type for non-atomic formal type", 11635 Actual); 11636 11637 elsif Is_Volatile (Act_T) and then not Is_Volatile (Ancestor) then 11638 Error_Msg_N 11639 ("cannot have volatile actual type for non-volatile formal type", 11640 Actual); 11641 end if; 11642 11643 -- It should not be necessary to check for unknown discriminants on 11644 -- Formal, but for some reason Has_Unknown_Discriminants is false for 11645 -- A_Gen_T, so Is_Indefinite_Subtype incorrectly returns False. This 11646 -- needs fixing. ??? 11647 11648 if not Is_Indefinite_Subtype (A_Gen_T) 11649 and then not Unknown_Discriminants_Present (Formal) 11650 and then Is_Indefinite_Subtype (Act_T) 11651 then 11652 Error_Msg_N ("actual subtype must be constrained", Actual); 11653 Abandon_Instantiation (Actual); 11654 end if; 11655 11656 if not Unknown_Discriminants_Present (Formal) then 11657 if Is_Constrained (Ancestor) then 11658 if not Is_Constrained (Act_T) then 11659 Error_Msg_N ("actual subtype must be constrained", Actual); 11660 Abandon_Instantiation (Actual); 11661 end if; 11662 11663 -- Ancestor is unconstrained, Check if generic formal and actual 11664 -- agree on constrainedness. The check only applies to array types 11665 -- and discriminated types. 11666 11667 elsif Is_Constrained (Act_T) then 11668 if Ekind (Ancestor) = E_Access_Type 11669 or else (not Is_Constrained (A_Gen_T) 11670 and then Is_Composite_Type (A_Gen_T)) 11671 then 11672 Error_Msg_N ("actual subtype must be unconstrained", Actual); 11673 Abandon_Instantiation (Actual); 11674 end if; 11675 11676 -- A class-wide type is only allowed if the formal has unknown 11677 -- discriminants. 11678 11679 elsif Is_Class_Wide_Type (Act_T) 11680 and then not Has_Unknown_Discriminants (Ancestor) 11681 then 11682 Error_Msg_NE 11683 ("actual for & cannot be a class-wide type", Actual, Gen_T); 11684 Abandon_Instantiation (Actual); 11685 11686 -- Otherwise, the formal and actual must have the same number 11687 -- of discriminants and each discriminant of the actual must 11688 -- correspond to a discriminant of the formal. 11689 11690 elsif Has_Discriminants (Act_T) 11691 and then not Has_Unknown_Discriminants (Act_T) 11692 and then Has_Discriminants (Ancestor) 11693 then 11694 Actual_Discr := First_Discriminant (Act_T); 11695 Ancestor_Discr := First_Discriminant (Ancestor); 11696 while Present (Actual_Discr) 11697 and then Present (Ancestor_Discr) 11698 loop 11699 if Base_Type (Act_T) /= Base_Type (Ancestor) and then 11700 No (Corresponding_Discriminant (Actual_Discr)) 11701 then 11702 Error_Msg_NE 11703 ("discriminant & does not correspond " 11704 & "to ancestor discriminant", Actual, Actual_Discr); 11705 Abandon_Instantiation (Actual); 11706 end if; 11707 11708 Next_Discriminant (Actual_Discr); 11709 Next_Discriminant (Ancestor_Discr); 11710 end loop; 11711 11712 if Present (Actual_Discr) or else Present (Ancestor_Discr) then 11713 Error_Msg_NE 11714 ("actual for & must have same number of discriminants", 11715 Actual, Gen_T); 11716 Abandon_Instantiation (Actual); 11717 end if; 11718 11719 -- This case should be caught by the earlier check for 11720 -- constrainedness, but the check here is added for completeness. 11721 11722 elsif Has_Discriminants (Act_T) 11723 and then not Has_Unknown_Discriminants (Act_T) 11724 then 11725 Error_Msg_NE 11726 ("actual for & must not have discriminants", Actual, Gen_T); 11727 Abandon_Instantiation (Actual); 11728 11729 elsif Has_Discriminants (Ancestor) then 11730 Error_Msg_NE 11731 ("actual for & must have known discriminants", Actual, Gen_T); 11732 Abandon_Instantiation (Actual); 11733 end if; 11734 11735 if not Subtypes_Statically_Compatible 11736 (Act_T, Ancestor, Formal_Derived_Matching => True) 11737 then 11738 Error_Msg_N 11739 ("constraint on actual is incompatible with formal", Actual); 11740 Abandon_Instantiation (Actual); 11741 end if; 11742 end if; 11743 11744 -- If the formal and actual types are abstract, check that there 11745 -- are no abstract primitives of the actual type that correspond to 11746 -- nonabstract primitives of the formal type (second sentence of 11747 -- RM95-3.9.3(9)). 11748 11749 if Is_Abstract_Type (A_Gen_T) and then Is_Abstract_Type (Act_T) then 11750 Check_Abstract_Primitives : declare 11751 Gen_Prims : constant Elist_Id := 11752 Primitive_Operations (A_Gen_T); 11753 Gen_Elmt : Elmt_Id; 11754 Gen_Subp : Entity_Id; 11755 Anc_Subp : Entity_Id; 11756 Anc_Formal : Entity_Id; 11757 Anc_F_Type : Entity_Id; 11758 11759 Act_Prims : constant Elist_Id := Primitive_Operations (Act_T); 11760 Act_Elmt : Elmt_Id; 11761 Act_Subp : Entity_Id; 11762 Act_Formal : Entity_Id; 11763 Act_F_Type : Entity_Id; 11764 11765 Subprograms_Correspond : Boolean; 11766 11767 function Is_Tagged_Ancestor (T1, T2 : Entity_Id) return Boolean; 11768 -- Returns true if T2 is derived directly or indirectly from 11769 -- T1, including derivations from interfaces. T1 and T2 are 11770 -- required to be specific tagged base types. 11771 11772 ------------------------ 11773 -- Is_Tagged_Ancestor -- 11774 ------------------------ 11775 11776 function Is_Tagged_Ancestor (T1, T2 : Entity_Id) return Boolean 11777 is 11778 Intfc_Elmt : Elmt_Id; 11779 11780 begin 11781 -- The predicate is satisfied if the types are the same 11782 11783 if T1 = T2 then 11784 return True; 11785 11786 -- If we've reached the top of the derivation chain then 11787 -- we know that T1 is not an ancestor of T2. 11788 11789 elsif Etype (T2) = T2 then 11790 return False; 11791 11792 -- Proceed to check T2's immediate parent 11793 11794 elsif Is_Ancestor (T1, Base_Type (Etype (T2))) then 11795 return True; 11796 11797 -- Finally, check to see if T1 is an ancestor of any of T2's 11798 -- progenitors. 11799 11800 else 11801 Intfc_Elmt := First_Elmt (Interfaces (T2)); 11802 while Present (Intfc_Elmt) loop 11803 if Is_Ancestor (T1, Node (Intfc_Elmt)) then 11804 return True; 11805 end if; 11806 11807 Next_Elmt (Intfc_Elmt); 11808 end loop; 11809 end if; 11810 11811 return False; 11812 end Is_Tagged_Ancestor; 11813 11814 -- Start of processing for Check_Abstract_Primitives 11815 11816 begin 11817 -- Loop over all of the formal derived type's primitives 11818 11819 Gen_Elmt := First_Elmt (Gen_Prims); 11820 while Present (Gen_Elmt) loop 11821 Gen_Subp := Node (Gen_Elmt); 11822 11823 -- If the primitive of the formal is not abstract, then 11824 -- determine whether there is a corresponding primitive of 11825 -- the actual type that's abstract. 11826 11827 if not Is_Abstract_Subprogram (Gen_Subp) then 11828 Act_Elmt := First_Elmt (Act_Prims); 11829 while Present (Act_Elmt) loop 11830 Act_Subp := Node (Act_Elmt); 11831 11832 -- If we find an abstract primitive of the actual, 11833 -- then we need to test whether it corresponds to the 11834 -- subprogram from which the generic formal primitive 11835 -- is inherited. 11836 11837 if Is_Abstract_Subprogram (Act_Subp) then 11838 Anc_Subp := Alias (Gen_Subp); 11839 11840 -- Test whether we have a corresponding primitive 11841 -- by comparing names, kinds, formal types, and 11842 -- result types. 11843 11844 if Chars (Anc_Subp) = Chars (Act_Subp) 11845 and then Ekind (Anc_Subp) = Ekind (Act_Subp) 11846 then 11847 Anc_Formal := First_Formal (Anc_Subp); 11848 Act_Formal := First_Formal (Act_Subp); 11849 while Present (Anc_Formal) 11850 and then Present (Act_Formal) 11851 loop 11852 Anc_F_Type := Etype (Anc_Formal); 11853 Act_F_Type := Etype (Act_Formal); 11854 11855 if Ekind (Anc_F_Type) = 11856 E_Anonymous_Access_Type 11857 then 11858 Anc_F_Type := Designated_Type (Anc_F_Type); 11859 11860 if Ekind (Act_F_Type) = 11861 E_Anonymous_Access_Type 11862 then 11863 Act_F_Type := 11864 Designated_Type (Act_F_Type); 11865 else 11866 exit; 11867 end if; 11868 11869 elsif 11870 Ekind (Act_F_Type) = E_Anonymous_Access_Type 11871 then 11872 exit; 11873 end if; 11874 11875 Anc_F_Type := Base_Type (Anc_F_Type); 11876 Act_F_Type := Base_Type (Act_F_Type); 11877 11878 -- If the formal is controlling, then the 11879 -- the type of the actual primitive's formal 11880 -- must be derived directly or indirectly 11881 -- from the type of the ancestor primitive's 11882 -- formal. 11883 11884 if Is_Controlling_Formal (Anc_Formal) then 11885 if not Is_Tagged_Ancestor 11886 (Anc_F_Type, Act_F_Type) 11887 then 11888 exit; 11889 end if; 11890 11891 -- Otherwise the types of the formals must 11892 -- be the same. 11893 11894 elsif Anc_F_Type /= Act_F_Type then 11895 exit; 11896 end if; 11897 11898 Next_Entity (Anc_Formal); 11899 Next_Entity (Act_Formal); 11900 end loop; 11901 11902 -- If we traversed through all of the formals 11903 -- then so far the subprograms correspond, so 11904 -- now check that any result types correspond. 11905 11906 if No (Anc_Formal) and then No (Act_Formal) then 11907 Subprograms_Correspond := True; 11908 11909 if Ekind (Act_Subp) = E_Function then 11910 Anc_F_Type := Etype (Anc_Subp); 11911 Act_F_Type := Etype (Act_Subp); 11912 11913 if Ekind (Anc_F_Type) = 11914 E_Anonymous_Access_Type 11915 then 11916 Anc_F_Type := 11917 Designated_Type (Anc_F_Type); 11918 11919 if Ekind (Act_F_Type) = 11920 E_Anonymous_Access_Type 11921 then 11922 Act_F_Type := 11923 Designated_Type (Act_F_Type); 11924 else 11925 Subprograms_Correspond := False; 11926 end if; 11927 11928 elsif 11929 Ekind (Act_F_Type) 11930 = E_Anonymous_Access_Type 11931 then 11932 Subprograms_Correspond := False; 11933 end if; 11934 11935 Anc_F_Type := Base_Type (Anc_F_Type); 11936 Act_F_Type := Base_Type (Act_F_Type); 11937 11938 -- Now either the result types must be 11939 -- the same or, if the result type is 11940 -- controlling, the result type of the 11941 -- actual primitive must descend from the 11942 -- result type of the ancestor primitive. 11943 11944 if Subprograms_Correspond 11945 and then Anc_F_Type /= Act_F_Type 11946 and then 11947 Has_Controlling_Result (Anc_Subp) 11948 and then not Is_Tagged_Ancestor 11949 (Anc_F_Type, Act_F_Type) 11950 then 11951 Subprograms_Correspond := False; 11952 end if; 11953 end if; 11954 11955 -- Found a matching subprogram belonging to 11956 -- formal ancestor type, so actual subprogram 11957 -- corresponds and this violates 3.9.3(9). 11958 11959 if Subprograms_Correspond then 11960 Error_Msg_NE 11961 ("abstract subprogram & overrides " 11962 & "nonabstract subprogram of ancestor", 11963 Actual, Act_Subp); 11964 end if; 11965 end if; 11966 end if; 11967 end if; 11968 11969 Next_Elmt (Act_Elmt); 11970 end loop; 11971 end if; 11972 11973 Next_Elmt (Gen_Elmt); 11974 end loop; 11975 end Check_Abstract_Primitives; 11976 end if; 11977 11978 -- Verify that limitedness matches. If parent is a limited 11979 -- interface then the generic formal is not unless declared 11980 -- explicitly so. If not declared limited, the actual cannot be 11981 -- limited (see AI05-0087). 11982 11983 -- Even though this AI is a binding interpretation, we enable the 11984 -- check only in Ada 2012 mode, because this improper construct 11985 -- shows up in user code and in existing B-tests. 11986 11987 if Is_Limited_Type (Act_T) 11988 and then not Is_Limited_Type (A_Gen_T) 11989 and then Ada_Version >= Ada_2012 11990 then 11991 if In_Instance then 11992 null; 11993 else 11994 Error_Msg_NE 11995 ("actual for non-limited & cannot be a limited type", 11996 Actual, Gen_T); 11997 Explain_Limited_Type (Act_T, Actual); 11998 Abandon_Instantiation (Actual); 11999 end if; 12000 end if; 12001 end Validate_Derived_Type_Instance; 12002 12003 ---------------------------------------- 12004 -- Validate_Discriminated_Formal_Type -- 12005 ---------------------------------------- 12006 12007 procedure Validate_Discriminated_Formal_Type is 12008 Formal_Discr : Entity_Id; 12009 Actual_Discr : Entity_Id; 12010 Formal_Subt : Entity_Id; 12011 12012 begin 12013 if Has_Discriminants (A_Gen_T) then 12014 if not Has_Discriminants (Act_T) then 12015 Error_Msg_NE 12016 ("actual for & must have discriminants", Actual, Gen_T); 12017 Abandon_Instantiation (Actual); 12018 12019 elsif Is_Constrained (Act_T) then 12020 Error_Msg_NE 12021 ("actual for & must be unconstrained", Actual, Gen_T); 12022 Abandon_Instantiation (Actual); 12023 12024 else 12025 Formal_Discr := First_Discriminant (A_Gen_T); 12026 Actual_Discr := First_Discriminant (Act_T); 12027 while Formal_Discr /= Empty loop 12028 if Actual_Discr = Empty then 12029 Error_Msg_NE 12030 ("discriminants on actual do not match formal", 12031 Actual, Gen_T); 12032 Abandon_Instantiation (Actual); 12033 end if; 12034 12035 Formal_Subt := Get_Instance_Of (Etype (Formal_Discr)); 12036 12037 -- Access discriminants match if designated types do 12038 12039 if Ekind (Base_Type (Formal_Subt)) = E_Anonymous_Access_Type 12040 and then (Ekind (Base_Type (Etype (Actual_Discr)))) = 12041 E_Anonymous_Access_Type 12042 and then 12043 Get_Instance_Of 12044 (Designated_Type (Base_Type (Formal_Subt))) = 12045 Designated_Type (Base_Type (Etype (Actual_Discr))) 12046 then 12047 null; 12048 12049 elsif Base_Type (Formal_Subt) /= 12050 Base_Type (Etype (Actual_Discr)) 12051 then 12052 Error_Msg_NE 12053 ("types of actual discriminants must match formal", 12054 Actual, Gen_T); 12055 Abandon_Instantiation (Actual); 12056 12057 elsif not Subtypes_Statically_Match 12058 (Formal_Subt, Etype (Actual_Discr)) 12059 and then Ada_Version >= Ada_95 12060 then 12061 Error_Msg_NE 12062 ("subtypes of actual discriminants must match formal", 12063 Actual, Gen_T); 12064 Abandon_Instantiation (Actual); 12065 end if; 12066 12067 Next_Discriminant (Formal_Discr); 12068 Next_Discriminant (Actual_Discr); 12069 end loop; 12070 12071 if Actual_Discr /= Empty then 12072 Error_Msg_NE 12073 ("discriminants on actual do not match formal", 12074 Actual, Gen_T); 12075 Abandon_Instantiation (Actual); 12076 end if; 12077 end if; 12078 end if; 12079 end Validate_Discriminated_Formal_Type; 12080 12081 --------------------------------------- 12082 -- Validate_Incomplete_Type_Instance -- 12083 --------------------------------------- 12084 12085 procedure Validate_Incomplete_Type_Instance is 12086 begin 12087 if not Is_Tagged_Type (Act_T) 12088 and then Is_Tagged_Type (A_Gen_T) 12089 then 12090 Error_Msg_NE 12091 ("actual for & must be a tagged type", Actual, Gen_T); 12092 end if; 12093 12094 Validate_Discriminated_Formal_Type; 12095 end Validate_Incomplete_Type_Instance; 12096 12097 -------------------------------------- 12098 -- Validate_Interface_Type_Instance -- 12099 -------------------------------------- 12100 12101 procedure Validate_Interface_Type_Instance is 12102 begin 12103 if not Is_Interface (Act_T) then 12104 Error_Msg_NE 12105 ("actual for formal interface type must be an interface", 12106 Actual, Gen_T); 12107 12108 elsif Is_Limited_Type (Act_T) /= Is_Limited_Type (A_Gen_T) 12109 or else Is_Task_Interface (A_Gen_T) /= Is_Task_Interface (Act_T) 12110 or else Is_Protected_Interface (A_Gen_T) /= 12111 Is_Protected_Interface (Act_T) 12112 or else Is_Synchronized_Interface (A_Gen_T) /= 12113 Is_Synchronized_Interface (Act_T) 12114 then 12115 Error_Msg_NE 12116 ("actual for interface& does not match (RM 12.5.5(4))", 12117 Actual, Gen_T); 12118 end if; 12119 end Validate_Interface_Type_Instance; 12120 12121 ------------------------------------ 12122 -- Validate_Private_Type_Instance -- 12123 ------------------------------------ 12124 12125 procedure Validate_Private_Type_Instance is 12126 begin 12127 if Is_Limited_Type (Act_T) 12128 and then not Is_Limited_Type (A_Gen_T) 12129 then 12130 if In_Instance then 12131 null; 12132 else 12133 Error_Msg_NE 12134 ("actual for non-limited & cannot be a limited type", Actual, 12135 Gen_T); 12136 Explain_Limited_Type (Act_T, Actual); 12137 Abandon_Instantiation (Actual); 12138 end if; 12139 12140 elsif Known_To_Have_Preelab_Init (A_Gen_T) 12141 and then not Has_Preelaborable_Initialization (Act_T) 12142 then 12143 Error_Msg_NE 12144 ("actual for & must have preelaborable initialization", Actual, 12145 Gen_T); 12146 12147 elsif Is_Indefinite_Subtype (Act_T) 12148 and then not Is_Indefinite_Subtype (A_Gen_T) 12149 and then Ada_Version >= Ada_95 12150 then 12151 Error_Msg_NE 12152 ("actual for & must be a definite subtype", Actual, Gen_T); 12153 12154 elsif not Is_Tagged_Type (Act_T) 12155 and then Is_Tagged_Type (A_Gen_T) 12156 then 12157 Error_Msg_NE 12158 ("actual for & must be a tagged type", Actual, Gen_T); 12159 end if; 12160 12161 Validate_Discriminated_Formal_Type; 12162 Ancestor := Gen_T; 12163 end Validate_Private_Type_Instance; 12164 12165 -- Start of processing for Instantiate_Type 12166 12167 begin 12168 if Get_Instance_Of (A_Gen_T) /= A_Gen_T then 12169 Error_Msg_N ("duplicate instantiation of generic type", Actual); 12170 return New_List (Error); 12171 12172 elsif not Is_Entity_Name (Actual) 12173 or else not Is_Type (Entity (Actual)) 12174 then 12175 Error_Msg_NE 12176 ("expect valid subtype mark to instantiate &", Actual, Gen_T); 12177 Abandon_Instantiation (Actual); 12178 12179 else 12180 Act_T := Entity (Actual); 12181 12182 -- Ada 2005 (AI-216): An Unchecked_Union subtype shall only be passed 12183 -- as a generic actual parameter if the corresponding formal type 12184 -- does not have a known_discriminant_part, or is a formal derived 12185 -- type that is an Unchecked_Union type. 12186 12187 if Is_Unchecked_Union (Base_Type (Act_T)) then 12188 if not Has_Discriminants (A_Gen_T) 12189 or else (Is_Derived_Type (A_Gen_T) 12190 and then Is_Unchecked_Union (A_Gen_T)) 12191 then 12192 null; 12193 else 12194 Error_Msg_N ("unchecked union cannot be the actual for a " 12195 & "discriminated formal type", Act_T); 12196 12197 end if; 12198 end if; 12199 12200 -- Deal with fixed/floating restrictions 12201 12202 if Is_Floating_Point_Type (Act_T) then 12203 Check_Restriction (No_Floating_Point, Actual); 12204 elsif Is_Fixed_Point_Type (Act_T) then 12205 Check_Restriction (No_Fixed_Point, Actual); 12206 end if; 12207 12208 -- Deal with error of using incomplete type as generic actual. 12209 -- This includes limited views of a type, even if the non-limited 12210 -- view may be available. 12211 12212 if Ekind (Act_T) = E_Incomplete_Type 12213 or else (Is_Class_Wide_Type (Act_T) 12214 and then Ekind (Root_Type (Act_T)) = E_Incomplete_Type) 12215 then 12216 -- If the formal is an incomplete type, the actual can be 12217 -- incomplete as well. 12218 12219 if Ekind (A_Gen_T) = E_Incomplete_Type then 12220 null; 12221 12222 elsif Is_Class_Wide_Type (Act_T) 12223 or else No (Full_View (Act_T)) 12224 then 12225 Error_Msg_N ("premature use of incomplete type", Actual); 12226 Abandon_Instantiation (Actual); 12227 else 12228 Act_T := Full_View (Act_T); 12229 Set_Entity (Actual, Act_T); 12230 12231 if Has_Private_Component (Act_T) then 12232 Error_Msg_N 12233 ("premature use of type with private component", Actual); 12234 end if; 12235 end if; 12236 12237 -- Deal with error of premature use of private type as generic actual 12238 12239 elsif Is_Private_Type (Act_T) 12240 and then Is_Private_Type (Base_Type (Act_T)) 12241 and then not Is_Generic_Type (Act_T) 12242 and then not Is_Derived_Type (Act_T) 12243 and then No (Full_View (Root_Type (Act_T))) 12244 then 12245 -- If the formal is an incomplete type, the actual can be 12246 -- private or incomplete as well. 12247 12248 if Ekind (A_Gen_T) = E_Incomplete_Type then 12249 null; 12250 else 12251 Error_Msg_N ("premature use of private type", Actual); 12252 end if; 12253 12254 elsif Has_Private_Component (Act_T) then 12255 Error_Msg_N 12256 ("premature use of type with private component", Actual); 12257 end if; 12258 12259 Set_Instance_Of (A_Gen_T, Act_T); 12260 12261 -- If the type is generic, the class-wide type may also be used 12262 12263 if Is_Tagged_Type (A_Gen_T) 12264 and then Is_Tagged_Type (Act_T) 12265 and then not Is_Class_Wide_Type (A_Gen_T) 12266 then 12267 Set_Instance_Of (Class_Wide_Type (A_Gen_T), 12268 Class_Wide_Type (Act_T)); 12269 end if; 12270 12271 if not Is_Abstract_Type (A_Gen_T) 12272 and then Is_Abstract_Type (Act_T) 12273 then 12274 Error_Msg_N 12275 ("actual of non-abstract formal cannot be abstract", Actual); 12276 end if; 12277 12278 -- A generic scalar type is a first subtype for which we generate 12279 -- an anonymous base type. Indicate that the instance of this base 12280 -- is the base type of the actual. 12281 12282 if Is_Scalar_Type (A_Gen_T) then 12283 Set_Instance_Of (Etype (A_Gen_T), Etype (Act_T)); 12284 end if; 12285 end if; 12286 12287 if Error_Posted (Act_T) then 12288 null; 12289 else 12290 case Nkind (Def) is 12291 when N_Formal_Private_Type_Definition => 12292 Validate_Private_Type_Instance; 12293 12294 when N_Formal_Incomplete_Type_Definition => 12295 Validate_Incomplete_Type_Instance; 12296 12297 when N_Formal_Derived_Type_Definition => 12298 Validate_Derived_Type_Instance; 12299 12300 when N_Formal_Discrete_Type_Definition => 12301 if not Is_Discrete_Type (Act_T) then 12302 Error_Msg_NE 12303 ("expect discrete type in instantiation of&", 12304 Actual, Gen_T); 12305 Abandon_Instantiation (Actual); 12306 end if; 12307 12308 Diagnose_Predicated_Actual; 12309 12310 when N_Formal_Signed_Integer_Type_Definition => 12311 if not Is_Signed_Integer_Type (Act_T) then 12312 Error_Msg_NE 12313 ("expect signed integer type in instantiation of&", 12314 Actual, Gen_T); 12315 Abandon_Instantiation (Actual); 12316 end if; 12317 12318 Diagnose_Predicated_Actual; 12319 12320 when N_Formal_Modular_Type_Definition => 12321 if not Is_Modular_Integer_Type (Act_T) then 12322 Error_Msg_NE 12323 ("expect modular type in instantiation of &", 12324 Actual, Gen_T); 12325 Abandon_Instantiation (Actual); 12326 end if; 12327 12328 Diagnose_Predicated_Actual; 12329 12330 when N_Formal_Floating_Point_Definition => 12331 if not Is_Floating_Point_Type (Act_T) then 12332 Error_Msg_NE 12333 ("expect float type in instantiation of &", Actual, Gen_T); 12334 Abandon_Instantiation (Actual); 12335 end if; 12336 12337 when N_Formal_Ordinary_Fixed_Point_Definition => 12338 if not Is_Ordinary_Fixed_Point_Type (Act_T) then 12339 Error_Msg_NE 12340 ("expect ordinary fixed point type in instantiation of &", 12341 Actual, Gen_T); 12342 Abandon_Instantiation (Actual); 12343 end if; 12344 12345 when N_Formal_Decimal_Fixed_Point_Definition => 12346 if not Is_Decimal_Fixed_Point_Type (Act_T) then 12347 Error_Msg_NE 12348 ("expect decimal type in instantiation of &", 12349 Actual, Gen_T); 12350 Abandon_Instantiation (Actual); 12351 end if; 12352 12353 when N_Array_Type_Definition => 12354 Validate_Array_Type_Instance; 12355 12356 when N_Access_To_Object_Definition => 12357 Validate_Access_Type_Instance; 12358 12359 when N_Access_Function_Definition | 12360 N_Access_Procedure_Definition => 12361 Validate_Access_Subprogram_Instance; 12362 12363 when N_Record_Definition => 12364 Validate_Interface_Type_Instance; 12365 12366 when N_Derived_Type_Definition => 12367 Validate_Derived_Interface_Type_Instance; 12368 12369 when others => 12370 raise Program_Error; 12371 12372 end case; 12373 end if; 12374 12375 Subt := New_Copy (Gen_T); 12376 12377 -- Use adjusted sloc of subtype name as the location for other nodes in 12378 -- the subtype declaration. 12379 12380 Loc := Sloc (Subt); 12381 12382 Decl_Node := 12383 Make_Subtype_Declaration (Loc, 12384 Defining_Identifier => Subt, 12385 Subtype_Indication => New_Occurrence_Of (Act_T, Loc)); 12386 12387 if Is_Private_Type (Act_T) then 12388 Set_Has_Private_View (Subtype_Indication (Decl_Node)); 12389 12390 elsif Is_Access_Type (Act_T) 12391 and then Is_Private_Type (Designated_Type (Act_T)) 12392 then 12393 Set_Has_Private_View (Subtype_Indication (Decl_Node)); 12394 end if; 12395 12396 -- In Ada 2012 the actual may be a limited view. Indicate that 12397 -- the local subtype must be treated as such. 12398 12399 if From_Limited_With (Act_T) then 12400 Set_Ekind (Subt, E_Incomplete_Subtype); 12401 Set_From_Limited_With (Subt); 12402 end if; 12403 12404 Decl_Nodes := New_List (Decl_Node); 12405 12406 -- Flag actual derived types so their elaboration produces the 12407 -- appropriate renamings for the primitive operations of the ancestor. 12408 -- Flag actual for formal private types as well, to determine whether 12409 -- operations in the private part may override inherited operations. 12410 -- If the formal has an interface list, the ancestor is not the 12411 -- parent, but the analyzed formal that includes the interface 12412 -- operations of all its progenitors. 12413 12414 -- Same treatment for formal private types, so we can check whether the 12415 -- type is tagged limited when validating derivations in the private 12416 -- part. (See AI05-096). 12417 12418 if Nkind (Def) = N_Formal_Derived_Type_Definition then 12419 if Present (Interface_List (Def)) then 12420 Set_Generic_Parent_Type (Decl_Node, A_Gen_T); 12421 else 12422 Set_Generic_Parent_Type (Decl_Node, Ancestor); 12423 end if; 12424 12425 elsif Nkind_In (Def, N_Formal_Private_Type_Definition, 12426 N_Formal_Incomplete_Type_Definition) 12427 then 12428 Set_Generic_Parent_Type (Decl_Node, A_Gen_T); 12429 end if; 12430 12431 -- If the actual is a synchronized type that implements an interface, 12432 -- the primitive operations are attached to the corresponding record, 12433 -- and we have to treat it as an additional generic actual, so that its 12434 -- primitive operations become visible in the instance. The task or 12435 -- protected type itself does not carry primitive operations. 12436 12437 if Is_Concurrent_Type (Act_T) 12438 and then Is_Tagged_Type (Act_T) 12439 and then Present (Corresponding_Record_Type (Act_T)) 12440 and then Present (Ancestor) 12441 and then Is_Interface (Ancestor) 12442 then 12443 declare 12444 Corr_Rec : constant Entity_Id := 12445 Corresponding_Record_Type (Act_T); 12446 New_Corr : Entity_Id; 12447 Corr_Decl : Node_Id; 12448 12449 begin 12450 New_Corr := Make_Temporary (Loc, 'S'); 12451 Corr_Decl := 12452 Make_Subtype_Declaration (Loc, 12453 Defining_Identifier => New_Corr, 12454 Subtype_Indication => 12455 New_Occurrence_Of (Corr_Rec, Loc)); 12456 Append_To (Decl_Nodes, Corr_Decl); 12457 12458 if Ekind (Act_T) = E_Task_Type then 12459 Set_Ekind (Subt, E_Task_Subtype); 12460 else 12461 Set_Ekind (Subt, E_Protected_Subtype); 12462 end if; 12463 12464 Set_Corresponding_Record_Type (Subt, Corr_Rec); 12465 Set_Generic_Parent_Type (Corr_Decl, Ancestor); 12466 Set_Generic_Parent_Type (Decl_Node, Empty); 12467 end; 12468 end if; 12469 12470 -- For a floating-point type, capture dimension info if any, because 12471 -- the generated subtype declaration does not come from source and 12472 -- will not process dimensions. 12473 12474 if Is_Floating_Point_Type (Act_T) then 12475 Copy_Dimensions (Act_T, Subt); 12476 end if; 12477 12478 return Decl_Nodes; 12479 end Instantiate_Type; 12480 12481 --------------------- 12482 -- Is_In_Main_Unit -- 12483 --------------------- 12484 12485 function Is_In_Main_Unit (N : Node_Id) return Boolean is 12486 Unum : constant Unit_Number_Type := Get_Source_Unit (N); 12487 Current_Unit : Node_Id; 12488 12489 begin 12490 if Unum = Main_Unit then 12491 return True; 12492 12493 -- If the current unit is a subunit then it is either the main unit or 12494 -- is being compiled as part of the main unit. 12495 12496 elsif Nkind (N) = N_Compilation_Unit then 12497 return Nkind (Unit (N)) = N_Subunit; 12498 end if; 12499 12500 Current_Unit := Parent (N); 12501 while Present (Current_Unit) 12502 and then Nkind (Current_Unit) /= N_Compilation_Unit 12503 loop 12504 Current_Unit := Parent (Current_Unit); 12505 end loop; 12506 12507 -- The instantiation node is in the main unit, or else the current node 12508 -- (perhaps as the result of nested instantiations) is in the main unit, 12509 -- or in the declaration of the main unit, which in this last case must 12510 -- be a body. 12511 12512 return Unum = Main_Unit 12513 or else Current_Unit = Cunit (Main_Unit) 12514 or else Current_Unit = Library_Unit (Cunit (Main_Unit)) 12515 or else (Present (Library_Unit (Current_Unit)) 12516 and then Is_In_Main_Unit (Library_Unit (Current_Unit))); 12517 end Is_In_Main_Unit; 12518 12519 ---------------------------- 12520 -- Load_Parent_Of_Generic -- 12521 ---------------------------- 12522 12523 procedure Load_Parent_Of_Generic 12524 (N : Node_Id; 12525 Spec : Node_Id; 12526 Body_Optional : Boolean := False) 12527 is 12528 Comp_Unit : constant Node_Id := Cunit (Get_Source_Unit (Spec)); 12529 Saved_Style_Check : constant Boolean := Style_Check; 12530 Saved_Warnings : constant Warning_Record := Save_Warnings; 12531 True_Parent : Node_Id; 12532 Inst_Node : Node_Id; 12533 OK : Boolean; 12534 Previous_Instances : constant Elist_Id := New_Elmt_List; 12535 12536 procedure Collect_Previous_Instances (Decls : List_Id); 12537 -- Collect all instantiations in the given list of declarations, that 12538 -- precede the generic that we need to load. If the bodies of these 12539 -- instantiations are available, we must analyze them, to ensure that 12540 -- the public symbols generated are the same when the unit is compiled 12541 -- to generate code, and when it is compiled in the context of a unit 12542 -- that needs a particular nested instance. This process is applied to 12543 -- both package and subprogram instances. 12544 12545 -------------------------------- 12546 -- Collect_Previous_Instances -- 12547 -------------------------------- 12548 12549 procedure Collect_Previous_Instances (Decls : List_Id) is 12550 Decl : Node_Id; 12551 12552 begin 12553 Decl := First (Decls); 12554 while Present (Decl) loop 12555 if Sloc (Decl) >= Sloc (Inst_Node) then 12556 return; 12557 12558 -- If Decl is an instantiation, then record it as requiring 12559 -- instantiation of the corresponding body, except if it is an 12560 -- abbreviated instantiation generated internally for conformance 12561 -- checking purposes only for the case of a formal package 12562 -- declared without a box (see Instantiate_Formal_Package). Such 12563 -- an instantiation does not generate any code (the actual code 12564 -- comes from actual) and thus does not need to be analyzed here. 12565 -- If the instantiation appears with a generic package body it is 12566 -- not analyzed here either. 12567 12568 elsif Nkind (Decl) = N_Package_Instantiation 12569 and then not Is_Internal (Defining_Entity (Decl)) 12570 then 12571 Append_Elmt (Decl, Previous_Instances); 12572 12573 -- For a subprogram instantiation, omit instantiations intrinsic 12574 -- operations (Unchecked_Conversions, etc.) that have no bodies. 12575 12576 elsif Nkind_In (Decl, N_Function_Instantiation, 12577 N_Procedure_Instantiation) 12578 and then not Is_Intrinsic_Subprogram (Entity (Name (Decl))) 12579 then 12580 Append_Elmt (Decl, Previous_Instances); 12581 12582 elsif Nkind (Decl) = N_Package_Declaration then 12583 Collect_Previous_Instances 12584 (Visible_Declarations (Specification (Decl))); 12585 Collect_Previous_Instances 12586 (Private_Declarations (Specification (Decl))); 12587 12588 -- Previous non-generic bodies may contain instances as well 12589 12590 elsif Nkind (Decl) = N_Package_Body 12591 and then Ekind (Corresponding_Spec (Decl)) /= E_Generic_Package 12592 then 12593 Collect_Previous_Instances (Declarations (Decl)); 12594 12595 elsif Nkind (Decl) = N_Subprogram_Body 12596 and then not Acts_As_Spec (Decl) 12597 and then not Is_Generic_Subprogram (Corresponding_Spec (Decl)) 12598 then 12599 Collect_Previous_Instances (Declarations (Decl)); 12600 end if; 12601 12602 Next (Decl); 12603 end loop; 12604 end Collect_Previous_Instances; 12605 12606 -- Start of processing for Load_Parent_Of_Generic 12607 12608 begin 12609 if not In_Same_Source_Unit (N, Spec) 12610 or else Nkind (Unit (Comp_Unit)) = N_Package_Declaration 12611 or else (Nkind (Unit (Comp_Unit)) = N_Package_Body 12612 and then not Is_In_Main_Unit (Spec)) 12613 then 12614 -- Find body of parent of spec, and analyze it. A special case arises 12615 -- when the parent is an instantiation, that is to say when we are 12616 -- currently instantiating a nested generic. In that case, there is 12617 -- no separate file for the body of the enclosing instance. Instead, 12618 -- the enclosing body must be instantiated as if it were a pending 12619 -- instantiation, in order to produce the body for the nested generic 12620 -- we require now. Note that in that case the generic may be defined 12621 -- in a package body, the instance defined in the same package body, 12622 -- and the original enclosing body may not be in the main unit. 12623 12624 Inst_Node := Empty; 12625 12626 True_Parent := Parent (Spec); 12627 while Present (True_Parent) 12628 and then Nkind (True_Parent) /= N_Compilation_Unit 12629 loop 12630 if Nkind (True_Parent) = N_Package_Declaration 12631 and then 12632 Nkind (Original_Node (True_Parent)) = N_Package_Instantiation 12633 then 12634 -- Parent is a compilation unit that is an instantiation. 12635 -- Instantiation node has been replaced with package decl. 12636 12637 Inst_Node := Original_Node (True_Parent); 12638 exit; 12639 12640 elsif Nkind (True_Parent) = N_Package_Declaration 12641 and then Present (Generic_Parent (Specification (True_Parent))) 12642 and then Nkind (Parent (True_Parent)) /= N_Compilation_Unit 12643 then 12644 -- Parent is an instantiation within another specification. 12645 -- Declaration for instance has been inserted before original 12646 -- instantiation node. A direct link would be preferable? 12647 12648 Inst_Node := Next (True_Parent); 12649 while Present (Inst_Node) 12650 and then Nkind (Inst_Node) /= N_Package_Instantiation 12651 loop 12652 Next (Inst_Node); 12653 end loop; 12654 12655 -- If the instance appears within a generic, and the generic 12656 -- unit is defined within a formal package of the enclosing 12657 -- generic, there is no generic body available, and none 12658 -- needed. A more precise test should be used ??? 12659 12660 if No (Inst_Node) then 12661 return; 12662 end if; 12663 12664 exit; 12665 12666 else 12667 True_Parent := Parent (True_Parent); 12668 end if; 12669 end loop; 12670 12671 -- Case where we are currently instantiating a nested generic 12672 12673 if Present (Inst_Node) then 12674 if Nkind (Parent (True_Parent)) = N_Compilation_Unit then 12675 12676 -- Instantiation node and declaration of instantiated package 12677 -- were exchanged when only the declaration was needed. 12678 -- Restore instantiation node before proceeding with body. 12679 12680 Set_Unit (Parent (True_Parent), Inst_Node); 12681 end if; 12682 12683 -- Now complete instantiation of enclosing body, if it appears in 12684 -- some other unit. If it appears in the current unit, the body 12685 -- will have been instantiated already. 12686 12687 if No (Corresponding_Body (Instance_Spec (Inst_Node))) then 12688 12689 -- We need to determine the expander mode to instantiate the 12690 -- enclosing body. Because the generic body we need may use 12691 -- global entities declared in the enclosing package (including 12692 -- aggregates) it is in general necessary to compile this body 12693 -- with expansion enabled, except if we are within a generic 12694 -- package, in which case the usual generic rule applies. 12695 12696 declare 12697 Exp_Status : Boolean := True; 12698 Scop : Entity_Id; 12699 12700 begin 12701 -- Loop through scopes looking for generic package 12702 12703 Scop := Scope (Defining_Entity (Instance_Spec (Inst_Node))); 12704 while Present (Scop) 12705 and then Scop /= Standard_Standard 12706 loop 12707 if Ekind (Scop) = E_Generic_Package then 12708 Exp_Status := False; 12709 exit; 12710 end if; 12711 12712 Scop := Scope (Scop); 12713 end loop; 12714 12715 -- Collect previous instantiations in the unit that contains 12716 -- the desired generic. 12717 12718 if Nkind (Parent (True_Parent)) /= N_Compilation_Unit 12719 and then not Body_Optional 12720 then 12721 declare 12722 Decl : Elmt_Id; 12723 Info : Pending_Body_Info; 12724 Par : Node_Id; 12725 12726 begin 12727 Par := Parent (Inst_Node); 12728 while Present (Par) loop 12729 exit when Nkind (Parent (Par)) = N_Compilation_Unit; 12730 Par := Parent (Par); 12731 end loop; 12732 12733 pragma Assert (Present (Par)); 12734 12735 if Nkind (Par) = N_Package_Body then 12736 Collect_Previous_Instances (Declarations (Par)); 12737 12738 elsif Nkind (Par) = N_Package_Declaration then 12739 Collect_Previous_Instances 12740 (Visible_Declarations (Specification (Par))); 12741 Collect_Previous_Instances 12742 (Private_Declarations (Specification (Par))); 12743 12744 else 12745 -- Enclosing unit is a subprogram body. In this 12746 -- case all instance bodies are processed in order 12747 -- and there is no need to collect them separately. 12748 12749 null; 12750 end if; 12751 12752 Decl := First_Elmt (Previous_Instances); 12753 while Present (Decl) loop 12754 Info := 12755 (Inst_Node => Node (Decl), 12756 Act_Decl => 12757 Instance_Spec (Node (Decl)), 12758 Expander_Status => Exp_Status, 12759 Current_Sem_Unit => 12760 Get_Code_Unit (Sloc (Node (Decl))), 12761 Scope_Suppress => Scope_Suppress, 12762 Local_Suppress_Stack_Top => 12763 Local_Suppress_Stack_Top, 12764 Version => Ada_Version, 12765 Version_Pragma => Ada_Version_Pragma, 12766 Warnings => Save_Warnings, 12767 SPARK_Mode => SPARK_Mode, 12768 SPARK_Mode_Pragma => SPARK_Mode_Pragma); 12769 12770 -- Package instance 12771 12772 if 12773 Nkind (Node (Decl)) = N_Package_Instantiation 12774 then 12775 Instantiate_Package_Body 12776 (Info, Body_Optional => True); 12777 12778 -- Subprogram instance 12779 12780 else 12781 -- The instance_spec is in the wrapper package, 12782 -- usually followed by its local renaming 12783 -- declaration. See Build_Subprogram_Renaming 12784 -- for details. 12785 12786 declare 12787 Decl : Node_Id := 12788 (Last (Visible_Declarations 12789 (Specification (Info.Act_Decl)))); 12790 begin 12791 if Nkind (Decl) = 12792 N_Subprogram_Renaming_Declaration 12793 then 12794 Decl := Prev (Decl); 12795 end if; 12796 12797 Info.Act_Decl := Decl; 12798 end; 12799 12800 Instantiate_Subprogram_Body 12801 (Info, Body_Optional => True); 12802 end if; 12803 12804 Next_Elmt (Decl); 12805 end loop; 12806 end; 12807 end if; 12808 12809 Instantiate_Package_Body 12810 (Body_Info => 12811 ((Inst_Node => Inst_Node, 12812 Act_Decl => True_Parent, 12813 Expander_Status => Exp_Status, 12814 Current_Sem_Unit => Get_Code_Unit 12815 (Sloc (Inst_Node)), 12816 Scope_Suppress => Scope_Suppress, 12817 Local_Suppress_Stack_Top => Local_Suppress_Stack_Top, 12818 Version => Ada_Version, 12819 Version_Pragma => Ada_Version_Pragma, 12820 Warnings => Save_Warnings, 12821 SPARK_Mode => SPARK_Mode, 12822 SPARK_Mode_Pragma => SPARK_Mode_Pragma)), 12823 Body_Optional => Body_Optional); 12824 end; 12825 end if; 12826 12827 -- Case where we are not instantiating a nested generic 12828 12829 else 12830 Opt.Style_Check := False; 12831 Expander_Mode_Save_And_Set (True); 12832 Load_Needed_Body (Comp_Unit, OK); 12833 Opt.Style_Check := Saved_Style_Check; 12834 Restore_Warnings (Saved_Warnings); 12835 Expander_Mode_Restore; 12836 12837 if not OK 12838 and then Unit_Requires_Body (Defining_Entity (Spec)) 12839 and then not Body_Optional 12840 then 12841 declare 12842 Bname : constant Unit_Name_Type := 12843 Get_Body_Name (Get_Unit_Name (Unit (Comp_Unit))); 12844 12845 begin 12846 -- In CodePeer mode, the missing body may make the analysis 12847 -- incomplete, but we do not treat it as fatal. 12848 12849 if CodePeer_Mode then 12850 return; 12851 12852 else 12853 Error_Msg_Unit_1 := Bname; 12854 Error_Msg_N ("this instantiation requires$!", N); 12855 Error_Msg_File_1 := 12856 Get_File_Name (Bname, Subunit => False); 12857 Error_Msg_N ("\but file{ was not found!", N); 12858 raise Unrecoverable_Error; 12859 end if; 12860 end; 12861 end if; 12862 end if; 12863 end if; 12864 12865 -- If loading parent of the generic caused an instantiation circularity, 12866 -- we abandon compilation at this point, because otherwise in some cases 12867 -- we get into trouble with infinite recursions after this point. 12868 12869 if Circularity_Detected then 12870 raise Unrecoverable_Error; 12871 end if; 12872 end Load_Parent_Of_Generic; 12873 12874 --------------------------------- 12875 -- Map_Formal_Package_Entities -- 12876 --------------------------------- 12877 12878 procedure Map_Formal_Package_Entities (Form : Entity_Id; Act : Entity_Id) is 12879 E1 : Entity_Id; 12880 E2 : Entity_Id; 12881 12882 begin 12883 Set_Instance_Of (Form, Act); 12884 12885 -- Traverse formal and actual package to map the corresponding entities. 12886 -- We skip over internal entities that may be generated during semantic 12887 -- analysis, and find the matching entities by name, given that they 12888 -- must appear in the same order. 12889 12890 E1 := First_Entity (Form); 12891 E2 := First_Entity (Act); 12892 while Present (E1) and then E1 /= First_Private_Entity (Form) loop 12893 -- Could this test be a single condition??? Seems like it could, and 12894 -- isn't FPE (Form) a constant anyway??? 12895 12896 if not Is_Internal (E1) 12897 and then Present (Parent (E1)) 12898 and then not Is_Class_Wide_Type (E1) 12899 and then not Is_Internal_Name (Chars (E1)) 12900 then 12901 while Present (E2) and then Chars (E2) /= Chars (E1) loop 12902 Next_Entity (E2); 12903 end loop; 12904 12905 if No (E2) then 12906 exit; 12907 else 12908 Set_Instance_Of (E1, E2); 12909 12910 if Is_Type (E1) and then Is_Tagged_Type (E2) then 12911 Set_Instance_Of (Class_Wide_Type (E1), Class_Wide_Type (E2)); 12912 end if; 12913 12914 if Is_Constrained (E1) then 12915 Set_Instance_Of (Base_Type (E1), Base_Type (E2)); 12916 end if; 12917 12918 if Ekind (E1) = E_Package and then No (Renamed_Object (E1)) then 12919 Map_Formal_Package_Entities (E1, E2); 12920 end if; 12921 end if; 12922 end if; 12923 12924 Next_Entity (E1); 12925 end loop; 12926 end Map_Formal_Package_Entities; 12927 12928 ----------------------- 12929 -- Move_Freeze_Nodes -- 12930 ----------------------- 12931 12932 procedure Move_Freeze_Nodes 12933 (Out_Of : Entity_Id; 12934 After : Node_Id; 12935 L : List_Id) 12936 is 12937 Decl : Node_Id; 12938 Next_Decl : Node_Id; 12939 Next_Node : Node_Id := After; 12940 Spec : Node_Id; 12941 12942 function Is_Outer_Type (T : Entity_Id) return Boolean; 12943 -- Check whether entity is declared in a scope external to that of the 12944 -- generic unit. 12945 12946 ------------------- 12947 -- Is_Outer_Type -- 12948 ------------------- 12949 12950 function Is_Outer_Type (T : Entity_Id) return Boolean is 12951 Scop : Entity_Id := Scope (T); 12952 12953 begin 12954 if Scope_Depth (Scop) < Scope_Depth (Out_Of) then 12955 return True; 12956 12957 else 12958 while Scop /= Standard_Standard loop 12959 if Scop = Out_Of then 12960 return False; 12961 else 12962 Scop := Scope (Scop); 12963 end if; 12964 end loop; 12965 12966 return True; 12967 end if; 12968 end Is_Outer_Type; 12969 12970 -- Start of processing for Move_Freeze_Nodes 12971 12972 begin 12973 if No (L) then 12974 return; 12975 end if; 12976 12977 -- First remove the freeze nodes that may appear before all other 12978 -- declarations. 12979 12980 Decl := First (L); 12981 while Present (Decl) 12982 and then Nkind (Decl) = N_Freeze_Entity 12983 and then Is_Outer_Type (Entity (Decl)) 12984 loop 12985 Decl := Remove_Head (L); 12986 Insert_After (Next_Node, Decl); 12987 Set_Analyzed (Decl, False); 12988 Next_Node := Decl; 12989 Decl := First (L); 12990 end loop; 12991 12992 -- Next scan the list of declarations and remove each freeze node that 12993 -- appears ahead of the current node. 12994 12995 while Present (Decl) loop 12996 while Present (Next (Decl)) 12997 and then Nkind (Next (Decl)) = N_Freeze_Entity 12998 and then Is_Outer_Type (Entity (Next (Decl))) 12999 loop 13000 Next_Decl := Remove_Next (Decl); 13001 Insert_After (Next_Node, Next_Decl); 13002 Set_Analyzed (Next_Decl, False); 13003 Next_Node := Next_Decl; 13004 end loop; 13005 13006 -- If the declaration is a nested package or concurrent type, then 13007 -- recurse. Nested generic packages will have been processed from the 13008 -- inside out. 13009 13010 case Nkind (Decl) is 13011 when N_Package_Declaration => 13012 Spec := Specification (Decl); 13013 13014 when N_Task_Type_Declaration => 13015 Spec := Task_Definition (Decl); 13016 13017 when N_Protected_Type_Declaration => 13018 Spec := Protected_Definition (Decl); 13019 13020 when others => 13021 Spec := Empty; 13022 end case; 13023 13024 if Present (Spec) then 13025 Move_Freeze_Nodes (Out_Of, Next_Node, Visible_Declarations (Spec)); 13026 Move_Freeze_Nodes (Out_Of, Next_Node, Private_Declarations (Spec)); 13027 end if; 13028 13029 Next (Decl); 13030 end loop; 13031 end Move_Freeze_Nodes; 13032 13033 ---------------- 13034 -- Next_Assoc -- 13035 ---------------- 13036 13037 function Next_Assoc (E : Assoc_Ptr) return Assoc_Ptr is 13038 begin 13039 return Generic_Renamings.Table (E).Next_In_HTable; 13040 end Next_Assoc; 13041 13042 ------------------------ 13043 -- Preanalyze_Actuals -- 13044 ------------------------ 13045 13046 procedure Preanalyze_Actuals (N : Node_Id) is 13047 Assoc : Node_Id; 13048 Act : Node_Id; 13049 Errs : constant Int := Serious_Errors_Detected; 13050 13051 Cur : Entity_Id := Empty; 13052 -- Current homograph of the instance name 13053 13054 Vis : Boolean; 13055 -- Saved visibility status of the current homograph 13056 13057 begin 13058 Assoc := First (Generic_Associations (N)); 13059 13060 -- If the instance is a child unit, its name may hide an outer homonym, 13061 -- so make it invisible to perform name resolution on the actuals. 13062 13063 if Nkind (Defining_Unit_Name (N)) = N_Defining_Program_Unit_Name 13064 and then Present 13065 (Current_Entity (Defining_Identifier (Defining_Unit_Name (N)))) 13066 then 13067 Cur := Current_Entity (Defining_Identifier (Defining_Unit_Name (N))); 13068 13069 if Is_Compilation_Unit (Cur) then 13070 Vis := Is_Immediately_Visible (Cur); 13071 Set_Is_Immediately_Visible (Cur, False); 13072 else 13073 Cur := Empty; 13074 end if; 13075 end if; 13076 13077 while Present (Assoc) loop 13078 if Nkind (Assoc) /= N_Others_Choice then 13079 Act := Explicit_Generic_Actual_Parameter (Assoc); 13080 13081 -- Within a nested instantiation, a defaulted actual is an empty 13082 -- association, so nothing to analyze. If the subprogram actual 13083 -- is an attribute, analyze prefix only, because actual is not a 13084 -- complete attribute reference. 13085 13086 -- If actual is an allocator, analyze expression only. The full 13087 -- analysis can generate code, and if instance is a compilation 13088 -- unit we have to wait until the package instance is installed 13089 -- to have a proper place to insert this code. 13090 13091 -- String literals may be operators, but at this point we do not 13092 -- know whether the actual is a formal subprogram or a string. 13093 13094 if No (Act) then 13095 null; 13096 13097 elsif Nkind (Act) = N_Attribute_Reference then 13098 Analyze (Prefix (Act)); 13099 13100 elsif Nkind (Act) = N_Explicit_Dereference then 13101 Analyze (Prefix (Act)); 13102 13103 elsif Nkind (Act) = N_Allocator then 13104 declare 13105 Expr : constant Node_Id := Expression (Act); 13106 13107 begin 13108 if Nkind (Expr) = N_Subtype_Indication then 13109 Analyze (Subtype_Mark (Expr)); 13110 13111 -- Analyze separately each discriminant constraint, when 13112 -- given with a named association. 13113 13114 declare 13115 Constr : Node_Id; 13116 13117 begin 13118 Constr := First (Constraints (Constraint (Expr))); 13119 while Present (Constr) loop 13120 if Nkind (Constr) = N_Discriminant_Association then 13121 Analyze (Expression (Constr)); 13122 else 13123 Analyze (Constr); 13124 end if; 13125 13126 Next (Constr); 13127 end loop; 13128 end; 13129 13130 else 13131 Analyze (Expr); 13132 end if; 13133 end; 13134 13135 elsif Nkind (Act) /= N_Operator_Symbol then 13136 Analyze (Act); 13137 end if; 13138 13139 if Errs /= Serious_Errors_Detected then 13140 13141 -- Do a minimal analysis of the generic, to prevent spurious 13142 -- warnings complaining about the generic being unreferenced, 13143 -- before abandoning the instantiation. 13144 13145 Analyze (Name (N)); 13146 13147 if Is_Entity_Name (Name (N)) 13148 and then Etype (Name (N)) /= Any_Type 13149 then 13150 Generate_Reference (Entity (Name (N)), Name (N)); 13151 Set_Is_Instantiated (Entity (Name (N))); 13152 end if; 13153 13154 if Present (Cur) then 13155 13156 -- For the case of a child instance hiding an outer homonym, 13157 -- provide additional warning which might explain the error. 13158 13159 Set_Is_Immediately_Visible (Cur, Vis); 13160 Error_Msg_NE 13161 ("& hides outer unit with the same name??", 13162 N, Defining_Unit_Name (N)); 13163 end if; 13164 13165 Abandon_Instantiation (Act); 13166 end if; 13167 end if; 13168 13169 Next (Assoc); 13170 end loop; 13171 13172 if Present (Cur) then 13173 Set_Is_Immediately_Visible (Cur, Vis); 13174 end if; 13175 end Preanalyze_Actuals; 13176 13177 ------------------- 13178 -- Remove_Parent -- 13179 ------------------- 13180 13181 procedure Remove_Parent (In_Body : Boolean := False) is 13182 S : Entity_Id := Current_Scope; 13183 -- S is the scope containing the instantiation just completed. The scope 13184 -- stack contains the parent instances of the instantiation, followed by 13185 -- the original S. 13186 13187 Cur_P : Entity_Id; 13188 E : Entity_Id; 13189 P : Entity_Id; 13190 Hidden : Elmt_Id; 13191 13192 begin 13193 -- After child instantiation is complete, remove from scope stack the 13194 -- extra copy of the current scope, and then remove parent instances. 13195 13196 if not In_Body then 13197 Pop_Scope; 13198 13199 while Current_Scope /= S loop 13200 P := Current_Scope; 13201 End_Package_Scope (Current_Scope); 13202 13203 if In_Open_Scopes (P) then 13204 E := First_Entity (P); 13205 while Present (E) loop 13206 Set_Is_Immediately_Visible (E, True); 13207 Next_Entity (E); 13208 end loop; 13209 13210 -- If instantiation is declared in a block, it is the enclosing 13211 -- scope that might be a parent instance. Note that only one 13212 -- block can be involved, because the parent instances have 13213 -- been installed within it. 13214 13215 if Ekind (P) = E_Block then 13216 Cur_P := Scope (P); 13217 else 13218 Cur_P := P; 13219 end if; 13220 13221 if Is_Generic_Instance (Cur_P) and then P /= Current_Scope then 13222 -- We are within an instance of some sibling. Retain 13223 -- visibility of parent, for proper subsequent cleanup, and 13224 -- reinstall private declarations as well. 13225 13226 Set_In_Private_Part (P); 13227 Install_Private_Declarations (P); 13228 end if; 13229 13230 -- If the ultimate parent is a top-level unit recorded in 13231 -- Instance_Parent_Unit, then reset its visibility to what it was 13232 -- before instantiation. (It's not clear what the purpose is of 13233 -- testing whether Scope (P) is In_Open_Scopes, but that test was 13234 -- present before the ultimate parent test was added.???) 13235 13236 elsif not In_Open_Scopes (Scope (P)) 13237 or else (P = Instance_Parent_Unit 13238 and then not Parent_Unit_Visible) 13239 then 13240 Set_Is_Immediately_Visible (P, False); 13241 13242 -- If the current scope is itself an instantiation of a generic 13243 -- nested within P, and we are in the private part of body of this 13244 -- instantiation, restore the full views of P, that were removed 13245 -- in End_Package_Scope above. This obscure case can occur when a 13246 -- subunit of a generic contains an instance of a child unit of 13247 -- its generic parent unit. 13248 13249 elsif S = Current_Scope and then Is_Generic_Instance (S) then 13250 declare 13251 Par : constant Entity_Id := 13252 Generic_Parent (Package_Specification (S)); 13253 begin 13254 if Present (Par) 13255 and then P = Scope (Par) 13256 and then (In_Package_Body (S) or else In_Private_Part (S)) 13257 then 13258 Set_In_Private_Part (P); 13259 Install_Private_Declarations (P); 13260 end if; 13261 end; 13262 end if; 13263 end loop; 13264 13265 -- Reset visibility of entities in the enclosing scope 13266 13267 Set_Is_Hidden_Open_Scope (Current_Scope, False); 13268 13269 Hidden := First_Elmt (Hidden_Entities); 13270 while Present (Hidden) loop 13271 Set_Is_Immediately_Visible (Node (Hidden), True); 13272 Next_Elmt (Hidden); 13273 end loop; 13274 13275 else 13276 -- Each body is analyzed separately, and there is no context that 13277 -- needs preserving from one body instance to the next, so remove all 13278 -- parent scopes that have been installed. 13279 13280 while Present (S) loop 13281 End_Package_Scope (S); 13282 Set_Is_Immediately_Visible (S, False); 13283 S := Current_Scope; 13284 exit when S = Standard_Standard; 13285 end loop; 13286 end if; 13287 end Remove_Parent; 13288 13289 ----------------- 13290 -- Restore_Env -- 13291 ----------------- 13292 13293 procedure Restore_Env is 13294 Saved : Instance_Env renames Instance_Envs.Table (Instance_Envs.Last); 13295 13296 begin 13297 if No (Current_Instantiated_Parent.Act_Id) then 13298 -- Restore environment after subprogram inlining 13299 13300 Restore_Private_Views (Empty); 13301 end if; 13302 13303 Current_Instantiated_Parent := Saved.Instantiated_Parent; 13304 Exchanged_Views := Saved.Exchanged_Views; 13305 Hidden_Entities := Saved.Hidden_Entities; 13306 Current_Sem_Unit := Saved.Current_Sem_Unit; 13307 Parent_Unit_Visible := Saved.Parent_Unit_Visible; 13308 Instance_Parent_Unit := Saved.Instance_Parent_Unit; 13309 13310 Restore_Opt_Config_Switches (Saved.Switches); 13311 13312 Instance_Envs.Decrement_Last; 13313 end Restore_Env; 13314 13315 --------------------------- 13316 -- Restore_Private_Views -- 13317 --------------------------- 13318 13319 procedure Restore_Private_Views 13320 (Pack_Id : Entity_Id; 13321 Is_Package : Boolean := True) 13322 is 13323 M : Elmt_Id; 13324 E : Entity_Id; 13325 Typ : Entity_Id; 13326 Dep_Elmt : Elmt_Id; 13327 Dep_Typ : Node_Id; 13328 13329 procedure Restore_Nested_Formal (Formal : Entity_Id); 13330 -- Hide the generic formals of formal packages declared with box which 13331 -- were reachable in the current instantiation. 13332 13333 --------------------------- 13334 -- Restore_Nested_Formal -- 13335 --------------------------- 13336 13337 procedure Restore_Nested_Formal (Formal : Entity_Id) is 13338 Ent : Entity_Id; 13339 13340 begin 13341 if Present (Renamed_Object (Formal)) 13342 and then Denotes_Formal_Package (Renamed_Object (Formal), True) 13343 then 13344 return; 13345 13346 elsif Present (Associated_Formal_Package (Formal)) then 13347 Ent := First_Entity (Formal); 13348 while Present (Ent) loop 13349 exit when Ekind (Ent) = E_Package 13350 and then Renamed_Entity (Ent) = Renamed_Entity (Formal); 13351 13352 Set_Is_Hidden (Ent); 13353 Set_Is_Potentially_Use_Visible (Ent, False); 13354 13355 -- If package, then recurse 13356 13357 if Ekind (Ent) = E_Package then 13358 Restore_Nested_Formal (Ent); 13359 end if; 13360 13361 Next_Entity (Ent); 13362 end loop; 13363 end if; 13364 end Restore_Nested_Formal; 13365 13366 -- Start of processing for Restore_Private_Views 13367 13368 begin 13369 M := First_Elmt (Exchanged_Views); 13370 while Present (M) loop 13371 Typ := Node (M); 13372 13373 -- Subtypes of types whose views have been exchanged, and that are 13374 -- defined within the instance, were not on the Private_Dependents 13375 -- list on entry to the instance, so they have to be exchanged 13376 -- explicitly now, in order to remain consistent with the view of the 13377 -- parent type. 13378 13379 if Ekind_In (Typ, E_Private_Type, 13380 E_Limited_Private_Type, 13381 E_Record_Type_With_Private) 13382 then 13383 Dep_Elmt := First_Elmt (Private_Dependents (Typ)); 13384 while Present (Dep_Elmt) loop 13385 Dep_Typ := Node (Dep_Elmt); 13386 13387 if Scope (Dep_Typ) = Pack_Id 13388 and then Present (Full_View (Dep_Typ)) 13389 then 13390 Replace_Elmt (Dep_Elmt, Full_View (Dep_Typ)); 13391 Exchange_Declarations (Dep_Typ); 13392 end if; 13393 13394 Next_Elmt (Dep_Elmt); 13395 end loop; 13396 end if; 13397 13398 Exchange_Declarations (Node (M)); 13399 Next_Elmt (M); 13400 end loop; 13401 13402 if No (Pack_Id) then 13403 return; 13404 end if; 13405 13406 -- Make the generic formal parameters private, and make the formal types 13407 -- into subtypes of the actuals again. 13408 13409 E := First_Entity (Pack_Id); 13410 while Present (E) loop 13411 Set_Is_Hidden (E, True); 13412 13413 if Is_Type (E) 13414 and then Nkind (Parent (E)) = N_Subtype_Declaration 13415 then 13416 -- If the actual for E is itself a generic actual type from 13417 -- an enclosing instance, E is still a generic actual type 13418 -- outside of the current instance. This matter when resolving 13419 -- an overloaded call that may be ambiguous in the enclosing 13420 -- instance, when two of its actuals coincide. 13421 13422 if Is_Entity_Name (Subtype_Indication (Parent (E))) 13423 and then Is_Generic_Actual_Type 13424 (Entity (Subtype_Indication (Parent (E)))) 13425 then 13426 null; 13427 else 13428 Set_Is_Generic_Actual_Type (E, False); 13429 end if; 13430 13431 -- An unusual case of aliasing: the actual may also be directly 13432 -- visible in the generic, and be private there, while it is fully 13433 -- visible in the context of the instance. The internal subtype 13434 -- is private in the instance but has full visibility like its 13435 -- parent in the enclosing scope. This enforces the invariant that 13436 -- the privacy status of all private dependents of a type coincide 13437 -- with that of the parent type. This can only happen when a 13438 -- generic child unit is instantiated within a sibling. 13439 13440 if Is_Private_Type (E) 13441 and then not Is_Private_Type (Etype (E)) 13442 then 13443 Exchange_Declarations (E); 13444 end if; 13445 13446 elsif Ekind (E) = E_Package then 13447 13448 -- The end of the renaming list is the renaming of the generic 13449 -- package itself. If the instance is a subprogram, all entities 13450 -- in the corresponding package are renamings. If this entity is 13451 -- a formal package, make its own formals private as well. The 13452 -- actual in this case is itself the renaming of an instantiation. 13453 -- If the entity is not a package renaming, it is the entity 13454 -- created to validate formal package actuals: ignore it. 13455 13456 -- If the actual is itself a formal package for the enclosing 13457 -- generic, or the actual for such a formal package, it remains 13458 -- visible on exit from the instance, and therefore nothing needs 13459 -- to be done either, except to keep it accessible. 13460 13461 if Is_Package and then Renamed_Object (E) = Pack_Id then 13462 exit; 13463 13464 elsif Nkind (Parent (E)) /= N_Package_Renaming_Declaration then 13465 null; 13466 13467 elsif 13468 Denotes_Formal_Package (Renamed_Object (E), True, Pack_Id) 13469 then 13470 Set_Is_Hidden (E, False); 13471 13472 else 13473 declare 13474 Act_P : constant Entity_Id := Renamed_Object (E); 13475 Id : Entity_Id; 13476 13477 begin 13478 Id := First_Entity (Act_P); 13479 while Present (Id) 13480 and then Id /= First_Private_Entity (Act_P) 13481 loop 13482 exit when Ekind (Id) = E_Package 13483 and then Renamed_Object (Id) = Act_P; 13484 13485 Set_Is_Hidden (Id, True); 13486 Set_Is_Potentially_Use_Visible (Id, In_Use (Act_P)); 13487 13488 if Ekind (Id) = E_Package then 13489 Restore_Nested_Formal (Id); 13490 end if; 13491 13492 Next_Entity (Id); 13493 end loop; 13494 end; 13495 end if; 13496 end if; 13497 13498 Next_Entity (E); 13499 end loop; 13500 end Restore_Private_Views; 13501 13502 -------------- 13503 -- Save_Env -- 13504 -------------- 13505 13506 procedure Save_Env 13507 (Gen_Unit : Entity_Id; 13508 Act_Unit : Entity_Id) 13509 is 13510 begin 13511 Init_Env; 13512 Set_Instance_Env (Gen_Unit, Act_Unit); 13513 end Save_Env; 13514 13515 ---------------------------- 13516 -- Save_Global_References -- 13517 ---------------------------- 13518 13519 procedure Save_Global_References (N : Node_Id) is 13520 Gen_Scope : Entity_Id; 13521 E : Entity_Id; 13522 N2 : Node_Id; 13523 13524 function Is_Global (E : Entity_Id) return Boolean; 13525 -- Check whether entity is defined outside of generic unit. Examine the 13526 -- scope of an entity, and the scope of the scope, etc, until we find 13527 -- either Standard, in which case the entity is global, or the generic 13528 -- unit itself, which indicates that the entity is local. If the entity 13529 -- is the generic unit itself, as in the case of a recursive call, or 13530 -- the enclosing generic unit, if different from the current scope, then 13531 -- it is local as well, because it will be replaced at the point of 13532 -- instantiation. On the other hand, if it is a reference to a child 13533 -- unit of a common ancestor, which appears in an instantiation, it is 13534 -- global because it is used to denote a specific compilation unit at 13535 -- the time the instantiations will be analyzed. 13536 13537 procedure Reset_Entity (N : Node_Id); 13538 -- Save semantic information on global entity so that it is not resolved 13539 -- again at instantiation time. 13540 13541 procedure Save_Entity_Descendants (N : Node_Id); 13542 -- Apply Save_Global_References to the two syntactic descendants of 13543 -- non-terminal nodes that carry an Associated_Node and are processed 13544 -- through Reset_Entity. Once the global entity (if any) has been 13545 -- captured together with its type, only two syntactic descendants need 13546 -- to be traversed to complete the processing of the tree rooted at N. 13547 -- This applies to Selected_Components, Expanded_Names, and to Operator 13548 -- nodes. N can also be a character literal, identifier, or operator 13549 -- symbol node, but the call has no effect in these cases. 13550 13551 procedure Save_Global_Defaults (N1, N2 : Node_Id); 13552 -- Default actuals in nested instances must be handled specially 13553 -- because there is no link to them from the original tree. When an 13554 -- actual subprogram is given by a default, we add an explicit generic 13555 -- association for it in the instantiation node. When we save the 13556 -- global references on the name of the instance, we recover the list 13557 -- of generic associations, and add an explicit one to the original 13558 -- generic tree, through which a global actual can be preserved. 13559 -- Similarly, if a child unit is instantiated within a sibling, in the 13560 -- context of the parent, we must preserve the identifier of the parent 13561 -- so that it can be properly resolved in a subsequent instantiation. 13562 13563 procedure Save_Global_Descendant (D : Union_Id); 13564 -- Apply Save_Global_References recursively to the descendents of the 13565 -- current node. 13566 13567 procedure Save_References (N : Node_Id); 13568 -- This is the recursive procedure that does the work, once the 13569 -- enclosing generic scope has been established. 13570 13571 --------------- 13572 -- Is_Global -- 13573 --------------- 13574 13575 function Is_Global (E : Entity_Id) return Boolean is 13576 Se : Entity_Id; 13577 13578 function Is_Instance_Node (Decl : Node_Id) return Boolean; 13579 -- Determine whether the parent node of a reference to a child unit 13580 -- denotes an instantiation or a formal package, in which case the 13581 -- reference to the child unit is global, even if it appears within 13582 -- the current scope (e.g. when the instance appears within the body 13583 -- of an ancestor). 13584 13585 ---------------------- 13586 -- Is_Instance_Node -- 13587 ---------------------- 13588 13589 function Is_Instance_Node (Decl : Node_Id) return Boolean is 13590 begin 13591 return Nkind (Decl) in N_Generic_Instantiation 13592 or else 13593 Nkind (Original_Node (Decl)) = N_Formal_Package_Declaration; 13594 end Is_Instance_Node; 13595 13596 -- Start of processing for Is_Global 13597 13598 begin 13599 if E = Gen_Scope then 13600 return False; 13601 13602 elsif E = Standard_Standard then 13603 return True; 13604 13605 elsif Is_Child_Unit (E) 13606 and then (Is_Instance_Node (Parent (N2)) 13607 or else (Nkind (Parent (N2)) = N_Expanded_Name 13608 and then N2 = Selector_Name (Parent (N2)) 13609 and then 13610 Is_Instance_Node (Parent (Parent (N2))))) 13611 then 13612 return True; 13613 13614 else 13615 Se := Scope (E); 13616 while Se /= Gen_Scope loop 13617 if Se = Standard_Standard then 13618 return True; 13619 else 13620 Se := Scope (Se); 13621 end if; 13622 end loop; 13623 13624 return False; 13625 end if; 13626 end Is_Global; 13627 13628 ------------------ 13629 -- Reset_Entity -- 13630 ------------------ 13631 13632 procedure Reset_Entity (N : Node_Id) is 13633 13634 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id); 13635 -- If the type of N2 is global to the generic unit, save the type in 13636 -- the generic node. Just as we perform name capture for explicit 13637 -- references within the generic, we must capture the global types 13638 -- of local entities because they may participate in resolution in 13639 -- the instance. 13640 13641 function Top_Ancestor (E : Entity_Id) return Entity_Id; 13642 -- Find the ultimate ancestor of the current unit. If it is not a 13643 -- generic unit, then the name of the current unit in the prefix of 13644 -- an expanded name must be replaced with its generic homonym to 13645 -- ensure that it will be properly resolved in an instance. 13646 13647 --------------------- 13648 -- Set_Global_Type -- 13649 --------------------- 13650 13651 procedure Set_Global_Type (N : Node_Id; N2 : Node_Id) is 13652 Typ : constant Entity_Id := Etype (N2); 13653 13654 begin 13655 Set_Etype (N, Typ); 13656 13657 if Entity (N) /= N2 13658 and then Has_Private_View (Entity (N)) 13659 then 13660 -- If the entity of N is not the associated node, this is a 13661 -- nested generic and it has an associated node as well, whose 13662 -- type is already the full view (see below). Indicate that the 13663 -- original node has a private view. 13664 13665 Set_Has_Private_View (N); 13666 end if; 13667 13668 -- If not a private type, nothing else to do 13669 13670 if not Is_Private_Type (Typ) then 13671 if Is_Array_Type (Typ) 13672 and then Is_Private_Type (Component_Type (Typ)) 13673 then 13674 Set_Has_Private_View (N); 13675 end if; 13676 13677 -- If it is a derivation of a private type in a context where no 13678 -- full view is needed, nothing to do either. 13679 13680 elsif No (Full_View (Typ)) and then Typ /= Etype (Typ) then 13681 null; 13682 13683 -- Otherwise mark the type for flipping and use the full view when 13684 -- available. 13685 13686 else 13687 Set_Has_Private_View (N); 13688 13689 if Present (Full_View (Typ)) then 13690 Set_Etype (N2, Full_View (Typ)); 13691 end if; 13692 end if; 13693 end Set_Global_Type; 13694 13695 ------------------ 13696 -- Top_Ancestor -- 13697 ------------------ 13698 13699 function Top_Ancestor (E : Entity_Id) return Entity_Id is 13700 Par : Entity_Id; 13701 13702 begin 13703 Par := E; 13704 while Is_Child_Unit (Par) loop 13705 Par := Scope (Par); 13706 end loop; 13707 13708 return Par; 13709 end Top_Ancestor; 13710 13711 -- Start of processing for Reset_Entity 13712 13713 begin 13714 N2 := Get_Associated_Node (N); 13715 E := Entity (N2); 13716 13717 if Present (E) then 13718 13719 -- If the node is an entry call to an entry in an enclosing task, 13720 -- it is rewritten as a selected component. No global entity to 13721 -- preserve in this case, since the expansion will be redone in 13722 -- the instance. 13723 13724 if not Nkind_In (E, N_Defining_Identifier, 13725 N_Defining_Character_Literal, 13726 N_Defining_Operator_Symbol) 13727 then 13728 Set_Associated_Node (N, Empty); 13729 Set_Etype (N, Empty); 13730 return; 13731 end if; 13732 13733 -- If the entity is an itype created as a subtype of an access 13734 -- type with a null exclusion restore source entity for proper 13735 -- visibility. The itype will be created anew in the instance. 13736 13737 if Is_Itype (E) 13738 and then Ekind (E) = E_Access_Subtype 13739 and then Is_Entity_Name (N) 13740 and then Chars (Etype (E)) = Chars (N) 13741 then 13742 E := Etype (E); 13743 Set_Entity (N2, E); 13744 Set_Etype (N2, E); 13745 end if; 13746 13747 if Is_Global (E) then 13748 13749 -- If the entity is a package renaming that is the prefix of 13750 -- an expanded name, it has been rewritten as the renamed 13751 -- package, which is necessary semantically but complicates 13752 -- ASIS tree traversal, so we recover the original entity to 13753 -- expose the renaming. Take into account that the context may 13754 -- be a nested generic, that the original node may itself have 13755 -- an associated node that had better be an entity, and that 13756 -- the current node is still a selected component. 13757 13758 if Ekind (E) = E_Package 13759 and then Nkind (N) = N_Selected_Component 13760 and then Nkind (Parent (N)) = N_Expanded_Name 13761 and then Present (Original_Node (N2)) 13762 and then Is_Entity_Name (Original_Node (N2)) 13763 and then Present (Entity (Original_Node (N2))) 13764 then 13765 if Is_Global (Entity (Original_Node (N2))) then 13766 N2 := Original_Node (N2); 13767 Set_Associated_Node (N, N2); 13768 Set_Global_Type (N, N2); 13769 13770 else 13771 -- Renaming is local, and will be resolved in instance 13772 13773 Set_Associated_Node (N, Empty); 13774 Set_Etype (N, Empty); 13775 end if; 13776 13777 else 13778 Set_Global_Type (N, N2); 13779 end if; 13780 13781 elsif Nkind (N) = N_Op_Concat 13782 and then Is_Generic_Type (Etype (N2)) 13783 and then (Base_Type (Etype (Right_Opnd (N2))) = Etype (N2) 13784 or else 13785 Base_Type (Etype (Left_Opnd (N2))) = Etype (N2)) 13786 and then Is_Intrinsic_Subprogram (E) 13787 then 13788 null; 13789 13790 else 13791 -- Entity is local. Mark generic node as unresolved. 13792 -- Note that now it does not have an entity. 13793 13794 Set_Associated_Node (N, Empty); 13795 Set_Etype (N, Empty); 13796 end if; 13797 13798 if Nkind (Parent (N)) in N_Generic_Instantiation 13799 and then N = Name (Parent (N)) 13800 then 13801 Save_Global_Defaults (Parent (N), Parent (N2)); 13802 end if; 13803 13804 elsif Nkind (Parent (N)) = N_Selected_Component 13805 and then Nkind (Parent (N2)) = N_Expanded_Name 13806 then 13807 if Is_Global (Entity (Parent (N2))) then 13808 Change_Selected_Component_To_Expanded_Name (Parent (N)); 13809 Set_Associated_Node (Parent (N), Parent (N2)); 13810 Set_Global_Type (Parent (N), Parent (N2)); 13811 Save_Entity_Descendants (N); 13812 13813 -- If this is a reference to the current generic entity, replace 13814 -- by the name of the generic homonym of the current package. This 13815 -- is because in an instantiation Par.P.Q will not resolve to the 13816 -- name of the instance, whose enclosing scope is not necessarily 13817 -- Par. We use the generic homonym rather that the name of the 13818 -- generic itself because it may be hidden by a local declaration. 13819 13820 elsif In_Open_Scopes (Entity (Parent (N2))) 13821 and then not 13822 Is_Generic_Unit (Top_Ancestor (Entity (Prefix (Parent (N2))))) 13823 then 13824 if Ekind (Entity (Parent (N2))) = E_Generic_Package then 13825 Rewrite (Parent (N), 13826 Make_Identifier (Sloc (N), 13827 Chars => 13828 Chars (Generic_Homonym (Entity (Parent (N2)))))); 13829 else 13830 Rewrite (Parent (N), 13831 Make_Identifier (Sloc (N), 13832 Chars => Chars (Selector_Name (Parent (N2))))); 13833 end if; 13834 end if; 13835 13836 if Nkind (Parent (Parent (N))) in N_Generic_Instantiation 13837 and then Parent (N) = Name (Parent (Parent (N))) 13838 then 13839 Save_Global_Defaults 13840 (Parent (Parent (N)), Parent (Parent ((N2)))); 13841 end if; 13842 13843 -- A selected component may denote a static constant that has been 13844 -- folded. If the static constant is global to the generic, capture 13845 -- its value. Otherwise the folding will happen in any instantiation. 13846 13847 elsif Nkind (Parent (N)) = N_Selected_Component 13848 and then Nkind_In (Parent (N2), N_Integer_Literal, N_Real_Literal) 13849 then 13850 if Present (Entity (Original_Node (Parent (N2)))) 13851 and then Is_Global (Entity (Original_Node (Parent (N2)))) 13852 then 13853 Rewrite (Parent (N), New_Copy (Parent (N2))); 13854 Set_Analyzed (Parent (N), False); 13855 13856 else 13857 null; 13858 end if; 13859 13860 -- A selected component may be transformed into a parameterless 13861 -- function call. If the called entity is global, rewrite the node 13862 -- appropriately, i.e. as an extended name for the global entity. 13863 13864 elsif Nkind (Parent (N)) = N_Selected_Component 13865 and then Nkind (Parent (N2)) = N_Function_Call 13866 and then N = Selector_Name (Parent (N)) 13867 then 13868 if No (Parameter_Associations (Parent (N2))) then 13869 if Is_Global (Entity (Name (Parent (N2)))) then 13870 Change_Selected_Component_To_Expanded_Name (Parent (N)); 13871 Set_Associated_Node (Parent (N), Name (Parent (N2))); 13872 Set_Global_Type (Parent (N), Name (Parent (N2))); 13873 Save_Entity_Descendants (N); 13874 13875 else 13876 Set_Is_Prefixed_Call (Parent (N)); 13877 Set_Associated_Node (N, Empty); 13878 Set_Etype (N, Empty); 13879 end if; 13880 13881 -- In Ada 2005, X.F may be a call to a primitive operation, 13882 -- rewritten as F (X). This rewriting will be done again in an 13883 -- instance, so keep the original node. Global entities will be 13884 -- captured as for other constructs. Indicate that this must 13885 -- resolve as a call, to prevent accidental overloading in the 13886 -- instance, if both a component and a primitive operation appear 13887 -- as candidates. 13888 13889 else 13890 Set_Is_Prefixed_Call (Parent (N)); 13891 end if; 13892 13893 -- Entity is local. Reset in generic unit, so that node is resolved 13894 -- anew at the point of instantiation. 13895 13896 else 13897 Set_Associated_Node (N, Empty); 13898 Set_Etype (N, Empty); 13899 end if; 13900 end Reset_Entity; 13901 13902 ----------------------------- 13903 -- Save_Entity_Descendants -- 13904 ----------------------------- 13905 13906 procedure Save_Entity_Descendants (N : Node_Id) is 13907 begin 13908 case Nkind (N) is 13909 when N_Binary_Op => 13910 Save_Global_Descendant (Union_Id (Left_Opnd (N))); 13911 Save_Global_Descendant (Union_Id (Right_Opnd (N))); 13912 13913 when N_Unary_Op => 13914 Save_Global_Descendant (Union_Id (Right_Opnd (N))); 13915 13916 when N_Expanded_Name | N_Selected_Component => 13917 Save_Global_Descendant (Union_Id (Prefix (N))); 13918 Save_Global_Descendant (Union_Id (Selector_Name (N))); 13919 13920 when N_Identifier | N_Character_Literal | N_Operator_Symbol => 13921 null; 13922 13923 when others => 13924 raise Program_Error; 13925 end case; 13926 end Save_Entity_Descendants; 13927 13928 -------------------------- 13929 -- Save_Global_Defaults -- 13930 -------------------------- 13931 13932 procedure Save_Global_Defaults (N1, N2 : Node_Id) is 13933 Loc : constant Source_Ptr := Sloc (N1); 13934 Assoc2 : constant List_Id := Generic_Associations (N2); 13935 Gen_Id : constant Entity_Id := Get_Generic_Entity (N2); 13936 Assoc1 : List_Id; 13937 Act1 : Node_Id; 13938 Act2 : Node_Id; 13939 Def : Node_Id; 13940 Ndec : Node_Id; 13941 Subp : Entity_Id; 13942 Actual : Entity_Id; 13943 13944 begin 13945 Assoc1 := Generic_Associations (N1); 13946 13947 if Present (Assoc1) then 13948 Act1 := First (Assoc1); 13949 else 13950 Act1 := Empty; 13951 Set_Generic_Associations (N1, New_List); 13952 Assoc1 := Generic_Associations (N1); 13953 end if; 13954 13955 if Present (Assoc2) then 13956 Act2 := First (Assoc2); 13957 else 13958 return; 13959 end if; 13960 13961 while Present (Act1) and then Present (Act2) loop 13962 Next (Act1); 13963 Next (Act2); 13964 end loop; 13965 13966 -- Find the associations added for default subprograms 13967 13968 if Present (Act2) then 13969 while Nkind (Act2) /= N_Generic_Association 13970 or else No (Entity (Selector_Name (Act2))) 13971 or else not Is_Overloadable (Entity (Selector_Name (Act2))) 13972 loop 13973 Next (Act2); 13974 end loop; 13975 13976 -- Add a similar association if the default is global. The 13977 -- renaming declaration for the actual has been analyzed, and 13978 -- its alias is the program it renames. Link the actual in the 13979 -- original generic tree with the node in the analyzed tree. 13980 13981 while Present (Act2) loop 13982 Subp := Entity (Selector_Name (Act2)); 13983 Def := Explicit_Generic_Actual_Parameter (Act2); 13984 13985 -- Following test is defence against rubbish errors 13986 13987 if No (Alias (Subp)) then 13988 return; 13989 end if; 13990 13991 -- Retrieve the resolved actual from the renaming declaration 13992 -- created for the instantiated formal. 13993 13994 Actual := Entity (Name (Parent (Parent (Subp)))); 13995 Set_Entity (Def, Actual); 13996 Set_Etype (Def, Etype (Actual)); 13997 13998 if Is_Global (Actual) then 13999 Ndec := 14000 Make_Generic_Association (Loc, 14001 Selector_Name => New_Occurrence_Of (Subp, Loc), 14002 Explicit_Generic_Actual_Parameter => 14003 New_Occurrence_Of (Actual, Loc)); 14004 14005 Set_Associated_Node 14006 (Explicit_Generic_Actual_Parameter (Ndec), Def); 14007 14008 Append (Ndec, Assoc1); 14009 14010 -- If there are other defaults, add a dummy association in case 14011 -- there are other defaulted formals with the same name. 14012 14013 elsif Present (Next (Act2)) then 14014 Ndec := 14015 Make_Generic_Association (Loc, 14016 Selector_Name => New_Occurrence_Of (Subp, Loc), 14017 Explicit_Generic_Actual_Parameter => Empty); 14018 14019 Append (Ndec, Assoc1); 14020 end if; 14021 14022 Next (Act2); 14023 end loop; 14024 end if; 14025 14026 if Nkind (Name (N1)) = N_Identifier 14027 and then Is_Child_Unit (Gen_Id) 14028 and then Is_Global (Gen_Id) 14029 and then Is_Generic_Unit (Scope (Gen_Id)) 14030 and then In_Open_Scopes (Scope (Gen_Id)) 14031 then 14032 -- This is an instantiation of a child unit within a sibling, so 14033 -- that the generic parent is in scope. An eventual instance must 14034 -- occur within the scope of an instance of the parent. Make name 14035 -- in instance into an expanded name, to preserve the identifier 14036 -- of the parent, so it can be resolved subsequently. 14037 14038 Rewrite (Name (N2), 14039 Make_Expanded_Name (Loc, 14040 Chars => Chars (Gen_Id), 14041 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc), 14042 Selector_Name => New_Occurrence_Of (Gen_Id, Loc))); 14043 Set_Entity (Name (N2), Gen_Id); 14044 14045 Rewrite (Name (N1), 14046 Make_Expanded_Name (Loc, 14047 Chars => Chars (Gen_Id), 14048 Prefix => New_Occurrence_Of (Scope (Gen_Id), Loc), 14049 Selector_Name => New_Occurrence_Of (Gen_Id, Loc))); 14050 14051 Set_Associated_Node (Name (N1), Name (N2)); 14052 Set_Associated_Node (Prefix (Name (N1)), Empty); 14053 Set_Associated_Node 14054 (Selector_Name (Name (N1)), Selector_Name (Name (N2))); 14055 Set_Etype (Name (N1), Etype (Gen_Id)); 14056 end if; 14057 14058 end Save_Global_Defaults; 14059 14060 ---------------------------- 14061 -- Save_Global_Descendant -- 14062 ---------------------------- 14063 14064 procedure Save_Global_Descendant (D : Union_Id) is 14065 N1 : Node_Id; 14066 14067 begin 14068 if D in Node_Range then 14069 if D = Union_Id (Empty) then 14070 null; 14071 14072 elsif Nkind (Node_Id (D)) /= N_Compilation_Unit then 14073 Save_References (Node_Id (D)); 14074 end if; 14075 14076 elsif D in List_Range then 14077 if D = Union_Id (No_List) or else Is_Empty_List (List_Id (D)) then 14078 null; 14079 14080 else 14081 N1 := First (List_Id (D)); 14082 while Present (N1) loop 14083 Save_References (N1); 14084 Next (N1); 14085 end loop; 14086 end if; 14087 14088 -- Element list or other non-node field, nothing to do 14089 14090 else 14091 null; 14092 end if; 14093 end Save_Global_Descendant; 14094 14095 --------------------- 14096 -- Save_References -- 14097 --------------------- 14098 14099 -- This is the recursive procedure that does the work once the enclosing 14100 -- generic scope has been established. We have to treat specially a 14101 -- number of node rewritings that are required by semantic processing 14102 -- and which change the kind of nodes in the generic copy: typically 14103 -- constant-folding, replacing an operator node by a string literal, or 14104 -- a selected component by an expanded name. In each of those cases, the 14105 -- transformation is propagated to the generic unit. 14106 14107 procedure Save_References (N : Node_Id) is 14108 Loc : constant Source_Ptr := Sloc (N); 14109 14110 begin 14111 if N = Empty then 14112 null; 14113 14114 elsif Nkind_In (N, N_Character_Literal, N_Operator_Symbol) then 14115 if Nkind (N) = Nkind (Get_Associated_Node (N)) then 14116 Reset_Entity (N); 14117 14118 elsif Nkind (N) = N_Operator_Symbol 14119 and then Nkind (Get_Associated_Node (N)) = N_String_Literal 14120 then 14121 Change_Operator_Symbol_To_String_Literal (N); 14122 end if; 14123 14124 elsif Nkind (N) in N_Op then 14125 if Nkind (N) = Nkind (Get_Associated_Node (N)) then 14126 if Nkind (N) = N_Op_Concat then 14127 Set_Is_Component_Left_Opnd (N, 14128 Is_Component_Left_Opnd (Get_Associated_Node (N))); 14129 14130 Set_Is_Component_Right_Opnd (N, 14131 Is_Component_Right_Opnd (Get_Associated_Node (N))); 14132 end if; 14133 14134 Reset_Entity (N); 14135 14136 else 14137 -- Node may be transformed into call to a user-defined operator 14138 14139 N2 := Get_Associated_Node (N); 14140 14141 if Nkind (N2) = N_Function_Call then 14142 E := Entity (Name (N2)); 14143 14144 if Present (E) 14145 and then Is_Global (E) 14146 then 14147 Set_Etype (N, Etype (N2)); 14148 else 14149 Set_Associated_Node (N, Empty); 14150 Set_Etype (N, Empty); 14151 end if; 14152 14153 elsif Nkind_In (N2, N_Integer_Literal, 14154 N_Real_Literal, 14155 N_String_Literal) 14156 then 14157 if Present (Original_Node (N2)) 14158 and then Nkind (Original_Node (N2)) = Nkind (N) 14159 then 14160 14161 -- Operation was constant-folded. Whenever possible, 14162 -- recover semantic information from unfolded node, 14163 -- for ASIS use. 14164 14165 Set_Associated_Node (N, Original_Node (N2)); 14166 14167 if Nkind (N) = N_Op_Concat then 14168 Set_Is_Component_Left_Opnd (N, 14169 Is_Component_Left_Opnd (Get_Associated_Node (N))); 14170 Set_Is_Component_Right_Opnd (N, 14171 Is_Component_Right_Opnd (Get_Associated_Node (N))); 14172 end if; 14173 14174 Reset_Entity (N); 14175 14176 else 14177 -- If original node is already modified, propagate 14178 -- constant-folding to template. 14179 14180 Rewrite (N, New_Copy (N2)); 14181 Set_Analyzed (N, False); 14182 end if; 14183 14184 elsif Nkind (N2) = N_Identifier 14185 and then Ekind (Entity (N2)) = E_Enumeration_Literal 14186 then 14187 -- Same if call was folded into a literal, but in this case 14188 -- retain the entity to avoid spurious ambiguities if it is 14189 -- overloaded at the point of instantiation or inlining. 14190 14191 Rewrite (N, New_Copy (N2)); 14192 Set_Analyzed (N, False); 14193 end if; 14194 end if; 14195 14196 -- Complete operands check if node has not been constant-folded 14197 14198 if Nkind (N) in N_Op then 14199 Save_Entity_Descendants (N); 14200 end if; 14201 14202 elsif Nkind (N) = N_Identifier then 14203 if Nkind (N) = Nkind (Get_Associated_Node (N)) then 14204 14205 -- If this is a discriminant reference, always save it. It is 14206 -- used in the instance to find the corresponding discriminant 14207 -- positionally rather than by name. 14208 14209 Set_Original_Discriminant 14210 (N, Original_Discriminant (Get_Associated_Node (N))); 14211 Reset_Entity (N); 14212 14213 else 14214 N2 := Get_Associated_Node (N); 14215 14216 if Nkind (N2) = N_Function_Call then 14217 E := Entity (Name (N2)); 14218 14219 -- Name resolves to a call to parameterless function. If 14220 -- original entity is global, mark node as resolved. 14221 14222 if Present (E) 14223 and then Is_Global (E) 14224 then 14225 Set_Etype (N, Etype (N2)); 14226 else 14227 Set_Associated_Node (N, Empty); 14228 Set_Etype (N, Empty); 14229 end if; 14230 14231 elsif Nkind_In (N2, N_Integer_Literal, N_Real_Literal) 14232 and then Is_Entity_Name (Original_Node (N2)) 14233 then 14234 -- Name resolves to named number that is constant-folded, 14235 -- We must preserve the original name for ASIS use, and 14236 -- undo the constant-folding, which will be repeated in 14237 -- each instance. 14238 14239 Set_Associated_Node (N, Original_Node (N2)); 14240 Reset_Entity (N); 14241 14242 elsif Nkind (N2) = N_String_Literal then 14243 14244 -- Name resolves to string literal. Perform the same 14245 -- replacement in generic. 14246 14247 Rewrite (N, New_Copy (N2)); 14248 14249 elsif Nkind (N2) = N_Explicit_Dereference then 14250 14251 -- An identifier is rewritten as a dereference if it is the 14252 -- prefix in an implicit dereference (call or attribute). 14253 -- The analysis of an instantiation will expand the node 14254 -- again, so we preserve the original tree but link it to 14255 -- the resolved entity in case it is global. 14256 14257 if Is_Entity_Name (Prefix (N2)) 14258 and then Present (Entity (Prefix (N2))) 14259 and then Is_Global (Entity (Prefix (N2))) 14260 then 14261 Set_Associated_Node (N, Prefix (N2)); 14262 14263 elsif Nkind (Prefix (N2)) = N_Function_Call 14264 and then Is_Global (Entity (Name (Prefix (N2)))) 14265 then 14266 Rewrite (N, 14267 Make_Explicit_Dereference (Loc, 14268 Prefix => Make_Function_Call (Loc, 14269 Name => 14270 New_Occurrence_Of 14271 (Entity (Name (Prefix (N2))), Loc)))); 14272 14273 else 14274 Set_Associated_Node (N, Empty); 14275 Set_Etype (N, Empty); 14276 end if; 14277 14278 -- The subtype mark of a nominally unconstrained object is 14279 -- rewritten as a subtype indication using the bounds of the 14280 -- expression. Recover the original subtype mark. 14281 14282 elsif Nkind (N2) = N_Subtype_Indication 14283 and then Is_Entity_Name (Original_Node (N2)) 14284 then 14285 Set_Associated_Node (N, Original_Node (N2)); 14286 Reset_Entity (N); 14287 14288 else 14289 null; 14290 end if; 14291 end if; 14292 14293 elsif Nkind (N) in N_Entity then 14294 null; 14295 14296 else 14297 declare 14298 Qual : Node_Id := Empty; 14299 Typ : Entity_Id := Empty; 14300 Nam : Node_Id; 14301 14302 use Atree.Unchecked_Access; 14303 -- This code section is part of implementing an untyped tree 14304 -- traversal, so it needs direct access to node fields. 14305 14306 begin 14307 if Nkind_In (N, N_Aggregate, N_Extension_Aggregate) then 14308 N2 := Get_Associated_Node (N); 14309 14310 if No (N2) then 14311 Typ := Empty; 14312 14313 else 14314 Typ := Etype (N2); 14315 14316 -- In an instance within a generic, use the name of the 14317 -- actual and not the original generic parameter. If the 14318 -- actual is global in the current generic it must be 14319 -- preserved for its instantiation. 14320 14321 if Nkind (Parent (Typ)) = N_Subtype_Declaration 14322 and then 14323 Present (Generic_Parent_Type (Parent (Typ))) 14324 then 14325 Typ := Base_Type (Typ); 14326 Set_Etype (N2, Typ); 14327 end if; 14328 end if; 14329 14330 if No (N2) or else No (Typ) or else not Is_Global (Typ) then 14331 Set_Associated_Node (N, Empty); 14332 14333 -- If the aggregate is an actual in a call, it has been 14334 -- resolved in the current context, to some local type. 14335 -- The enclosing call may have been disambiguated by the 14336 -- aggregate, and this disambiguation might fail at 14337 -- instantiation time because the type to which the 14338 -- aggregate did resolve is not preserved. In order to 14339 -- preserve some of this information, we wrap the 14340 -- aggregate in a qualified expression, using the id of 14341 -- its type. For further disambiguation we qualify the 14342 -- type name with its scope (if visible) because both 14343 -- id's will have corresponding entities in an instance. 14344 -- This resolves most of the problems with missing type 14345 -- information on aggregates in instances. 14346 14347 if Nkind (N2) = Nkind (N) 14348 and then Nkind (Parent (N2)) in N_Subprogram_Call 14349 and then Comes_From_Source (Typ) 14350 then 14351 if Is_Immediately_Visible (Scope (Typ)) then 14352 Nam := 14353 Make_Selected_Component (Loc, 14354 Prefix => 14355 Make_Identifier (Loc, Chars (Scope (Typ))), 14356 Selector_Name => 14357 Make_Identifier (Loc, Chars (Typ))); 14358 else 14359 Nam := Make_Identifier (Loc, Chars (Typ)); 14360 end if; 14361 14362 Qual := 14363 Make_Qualified_Expression (Loc, 14364 Subtype_Mark => Nam, 14365 Expression => Relocate_Node (N)); 14366 end if; 14367 end if; 14368 14369 Save_Global_Descendant (Field1 (N)); 14370 Save_Global_Descendant (Field2 (N)); 14371 Save_Global_Descendant (Field3 (N)); 14372 Save_Global_Descendant (Field5 (N)); 14373 14374 if Present (Qual) then 14375 Rewrite (N, Qual); 14376 end if; 14377 14378 -- All other cases than aggregates 14379 14380 else 14381 Save_Global_Descendant (Field1 (N)); 14382 Save_Global_Descendant (Field2 (N)); 14383 Save_Global_Descendant (Field3 (N)); 14384 Save_Global_Descendant (Field4 (N)); 14385 Save_Global_Descendant (Field5 (N)); 14386 end if; 14387 end; 14388 end if; 14389 14390 -- Save all global references found within the aspects of the related 14391 -- node. This is not done for generic subprograms because the aspects 14392 -- must be delayed and analyzed at the end of the declarative part. 14393 -- Only then can global references be saved. This action is performed 14394 -- by the analysis of the generic subprogram contract. 14395 14396 if Nkind (N) /= N_Generic_Subprogram_Declaration then 14397 Save_Global_References_In_Aspects (N); 14398 end if; 14399 end Save_References; 14400 14401 -- Start of processing for Save_Global_References 14402 14403 begin 14404 Gen_Scope := Current_Scope; 14405 14406 -- If the generic unit is a child unit, references to entities in the 14407 -- parent are treated as local, because they will be resolved anew in 14408 -- the context of the instance of the parent. 14409 14410 while Is_Child_Unit (Gen_Scope) 14411 and then Ekind (Scope (Gen_Scope)) = E_Generic_Package 14412 loop 14413 Gen_Scope := Scope (Gen_Scope); 14414 end loop; 14415 14416 Save_References (N); 14417 end Save_Global_References; 14418 14419 --------------------------------------- 14420 -- Save_Global_References_In_Aspects -- 14421 --------------------------------------- 14422 14423 procedure Save_Global_References_In_Aspects (N : Node_Id) is 14424 Asp : Node_Id; 14425 Expr : Node_Id; 14426 14427 begin 14428 if Permits_Aspect_Specifications (N) and then Has_Aspects (N) then 14429 Asp := First (Aspect_Specifications (N)); 14430 while Present (Asp) loop 14431 Expr := Expression (Asp); 14432 14433 if Present (Expr) then 14434 Save_Global_References (Expr); 14435 end if; 14436 14437 Next (Asp); 14438 end loop; 14439 end if; 14440 end Save_Global_References_In_Aspects; 14441 14442 -------------------------------------- 14443 -- Set_Copied_Sloc_For_Inlined_Body -- 14444 -------------------------------------- 14445 14446 procedure Set_Copied_Sloc_For_Inlined_Body (N : Node_Id; E : Entity_Id) is 14447 begin 14448 Create_Instantiation_Source (N, E, True, S_Adjustment); 14449 end Set_Copied_Sloc_For_Inlined_Body; 14450 14451 --------------------- 14452 -- Set_Instance_Of -- 14453 --------------------- 14454 14455 procedure Set_Instance_Of (A : Entity_Id; B : Entity_Id) is 14456 begin 14457 Generic_Renamings.Table (Generic_Renamings.Last) := (A, B, Assoc_Null); 14458 Generic_Renamings_HTable.Set (Generic_Renamings.Last); 14459 Generic_Renamings.Increment_Last; 14460 end Set_Instance_Of; 14461 14462 -------------------- 14463 -- Set_Next_Assoc -- 14464 -------------------- 14465 14466 procedure Set_Next_Assoc (E : Assoc_Ptr; Next : Assoc_Ptr) is 14467 begin 14468 Generic_Renamings.Table (E).Next_In_HTable := Next; 14469 end Set_Next_Assoc; 14470 14471 ------------------- 14472 -- Start_Generic -- 14473 ------------------- 14474 14475 procedure Start_Generic is 14476 begin 14477 -- ??? More things could be factored out in this routine. 14478 -- Should probably be done at a later stage. 14479 14480 Generic_Flags.Append (Inside_A_Generic); 14481 Inside_A_Generic := True; 14482 14483 Expander_Mode_Save_And_Set (False); 14484 end Start_Generic; 14485 14486 ---------------------- 14487 -- Set_Instance_Env -- 14488 ---------------------- 14489 14490 procedure Set_Instance_Env 14491 (Gen_Unit : Entity_Id; 14492 Act_Unit : Entity_Id) 14493 is 14494 Assertion_Status : constant Boolean := Assertions_Enabled; 14495 Save_SPARK_Mode : constant SPARK_Mode_Type := SPARK_Mode; 14496 Save_SPARK_Mode_Pragma : constant Node_Id := SPARK_Mode_Pragma; 14497 14498 begin 14499 -- Regardless of the current mode, predefined units are analyzed in the 14500 -- most current Ada mode, and earlier version Ada checks do not apply 14501 -- to predefined units. Nothing needs to be done for non-internal units. 14502 -- These are always analyzed in the current mode. 14503 14504 if Is_Internal_File_Name 14505 (Fname => Unit_File_Name (Get_Source_Unit (Gen_Unit)), 14506 Renamings_Included => True) 14507 then 14508 Set_Opt_Config_Switches (True, Current_Sem_Unit = Main_Unit); 14509 14510 -- In Ada2012 we may want to enable assertions in an instance of a 14511 -- predefined unit, in which case we need to preserve the current 14512 -- setting for the Assertions_Enabled flag. This will become more 14513 -- critical when pre/postconditions are added to predefined units, 14514 -- as is already the case for some numeric libraries. 14515 14516 if Ada_Version >= Ada_2012 then 14517 Assertions_Enabled := Assertion_Status; 14518 end if; 14519 14520 -- SPARK_Mode for an instance is the one applicable at the point of 14521 -- instantiation. 14522 14523 SPARK_Mode := Save_SPARK_Mode; 14524 SPARK_Mode_Pragma := Save_SPARK_Mode_Pragma; 14525 14526 -- Make sure dynamic elaboration checks are off in SPARK Mode 14527 14528 if SPARK_Mode = On then 14529 Dynamic_Elaboration_Checks := False; 14530 end if; 14531 end if; 14532 14533 Current_Instantiated_Parent := 14534 (Gen_Id => Gen_Unit, 14535 Act_Id => Act_Unit, 14536 Next_In_HTable => Assoc_Null); 14537 end Set_Instance_Env; 14538 14539 ----------------- 14540 -- Switch_View -- 14541 ----------------- 14542 14543 procedure Switch_View (T : Entity_Id) is 14544 BT : constant Entity_Id := Base_Type (T); 14545 Priv_Elmt : Elmt_Id := No_Elmt; 14546 Priv_Sub : Entity_Id; 14547 14548 begin 14549 -- T may be private but its base type may have been exchanged through 14550 -- some other occurrence, in which case there is nothing to switch 14551 -- besides T itself. Note that a private dependent subtype of a private 14552 -- type might not have been switched even if the base type has been, 14553 -- because of the last branch of Check_Private_View (see comment there). 14554 14555 if not Is_Private_Type (BT) then 14556 Prepend_Elmt (Full_View (T), Exchanged_Views); 14557 Exchange_Declarations (T); 14558 return; 14559 end if; 14560 14561 Priv_Elmt := First_Elmt (Private_Dependents (BT)); 14562 14563 if Present (Full_View (BT)) then 14564 Prepend_Elmt (Full_View (BT), Exchanged_Views); 14565 Exchange_Declarations (BT); 14566 end if; 14567 14568 while Present (Priv_Elmt) loop 14569 Priv_Sub := (Node (Priv_Elmt)); 14570 14571 -- We avoid flipping the subtype if the Etype of its full view is 14572 -- private because this would result in a malformed subtype. This 14573 -- occurs when the Etype of the subtype full view is the full view of 14574 -- the base type (and since the base types were just switched, the 14575 -- subtype is pointing to the wrong view). This is currently the case 14576 -- for tagged record types, access types (maybe more?) and needs to 14577 -- be resolved. ??? 14578 14579 if Present (Full_View (Priv_Sub)) 14580 and then not Is_Private_Type (Etype (Full_View (Priv_Sub))) 14581 then 14582 Prepend_Elmt (Full_View (Priv_Sub), Exchanged_Views); 14583 Exchange_Declarations (Priv_Sub); 14584 end if; 14585 14586 Next_Elmt (Priv_Elmt); 14587 end loop; 14588 end Switch_View; 14589 14590 ----------------- 14591 -- True_Parent -- 14592 ----------------- 14593 14594 function True_Parent (N : Node_Id) return Node_Id is 14595 begin 14596 if Nkind (Parent (N)) = N_Subunit then 14597 return Parent (Corresponding_Stub (Parent (N))); 14598 else 14599 return Parent (N); 14600 end if; 14601 end True_Parent; 14602 14603 ----------------------------- 14604 -- Valid_Default_Attribute -- 14605 ----------------------------- 14606 14607 procedure Valid_Default_Attribute (Nam : Entity_Id; Def : Node_Id) is 14608 Attr_Id : constant Attribute_Id := 14609 Get_Attribute_Id (Attribute_Name (Def)); 14610 T : constant Entity_Id := Entity (Prefix (Def)); 14611 Is_Fun : constant Boolean := (Ekind (Nam) = E_Function); 14612 F : Entity_Id; 14613 Num_F : Int; 14614 OK : Boolean; 14615 14616 begin 14617 if No (T) or else T = Any_Id then 14618 return; 14619 end if; 14620 14621 Num_F := 0; 14622 F := First_Formal (Nam); 14623 while Present (F) loop 14624 Num_F := Num_F + 1; 14625 Next_Formal (F); 14626 end loop; 14627 14628 case Attr_Id is 14629 when Attribute_Adjacent | Attribute_Ceiling | Attribute_Copy_Sign | 14630 Attribute_Floor | Attribute_Fraction | Attribute_Machine | 14631 Attribute_Model | Attribute_Remainder | Attribute_Rounding | 14632 Attribute_Unbiased_Rounding => 14633 OK := Is_Fun 14634 and then Num_F = 1 14635 and then Is_Floating_Point_Type (T); 14636 14637 when Attribute_Image | Attribute_Pred | Attribute_Succ | 14638 Attribute_Value | Attribute_Wide_Image | 14639 Attribute_Wide_Value => 14640 OK := (Is_Fun and then Num_F = 1 and then Is_Scalar_Type (T)); 14641 14642 when Attribute_Max | Attribute_Min => 14643 OK := (Is_Fun and then Num_F = 2 and then Is_Scalar_Type (T)); 14644 14645 when Attribute_Input => 14646 OK := (Is_Fun and then Num_F = 1); 14647 14648 when Attribute_Output | Attribute_Read | Attribute_Write => 14649 OK := (not Is_Fun and then Num_F = 2); 14650 14651 when others => 14652 OK := False; 14653 end case; 14654 14655 if not OK then 14656 Error_Msg_N 14657 ("attribute reference has wrong profile for subprogram", Def); 14658 end if; 14659 end Valid_Default_Attribute; 14660 14661end Sem_Ch12; 14662