1------------------------------------------------------------------------------ 2-- -- 3-- GNAT COMPILER COMPONENTS -- 4-- -- 5-- S E M _ C A T -- 6-- -- 7-- B o d y -- 8-- -- 9-- Copyright (C) 1992-2014, 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 Atree; use Atree; 27with Debug; use Debug; 28with Einfo; use Einfo; 29with Elists; use Elists; 30with Errout; use Errout; 31with Exp_Disp; use Exp_Disp; 32with Fname; use Fname; 33with Lib; use Lib; 34with Namet; use Namet; 35with Nlists; use Nlists; 36with Opt; use Opt; 37with Sem; use Sem; 38with Sem_Attr; use Sem_Attr; 39with Sem_Aux; use Sem_Aux; 40with Sem_Dist; use Sem_Dist; 41with Sem_Eval; use Sem_Eval; 42with Sem_Util; use Sem_Util; 43with Sinfo; use Sinfo; 44with Snames; use Snames; 45with Stand; use Stand; 46 47package body Sem_Cat is 48 49 ----------------------- 50 -- Local Subprograms -- 51 ----------------------- 52 53 procedure Check_Categorization_Dependencies 54 (Unit_Entity : Entity_Id; 55 Depended_Entity : Entity_Id; 56 Info_Node : Node_Id; 57 Is_Subunit : Boolean); 58 -- This procedure checks that the categorization of a lib unit and that 59 -- of the depended unit satisfy dependency restrictions. 60 -- The depended_entity can be the entity in a with_clause item, in which 61 -- case Info_Node denotes that item. The depended_entity can also be the 62 -- parent unit of a child unit, in which case Info_Node is the declaration 63 -- of the child unit. The error message is posted on Info_Node, and is 64 -- specialized if Is_Subunit is true. 65 66 procedure Check_Non_Static_Default_Expr 67 (Type_Def : Node_Id; 68 Obj_Decl : Node_Id); 69 -- Iterate through the component list of a record definition, check 70 -- that no component is declared with a nonstatic default value. 71 -- If a nonstatic default exists, report an error on Obj_Decl. 72 73 function Has_Read_Write_Attributes (E : Entity_Id) return Boolean; 74 -- Return True if entity has attribute definition clauses for Read and 75 -- Write attributes that are visible at some place. 76 77 function Is_Non_Remote_Access_Type (E : Entity_Id) return Boolean; 78 -- Returns true if the entity is a type whose full view is a non-remote 79 -- access type, for the purpose of enforcing E.2.2(8) rules. 80 81 function Has_Non_Remote_Access (Typ : Entity_Id) return Boolean; 82 -- Return true if Typ or the type of any of its subcomponents is a non 83 -- remote access type and doesn't have user-defined stream attributes. 84 85 function No_External_Streaming (E : Entity_Id) return Boolean; 86 -- Return True if the entity or one of its subcomponents does not support 87 -- external streaming. 88 89 function In_RCI_Declaration return Boolean; 90 function In_RT_Declaration return Boolean; 91 -- Determine if current scope is within the declaration of a Remote Call 92 -- Interface or Remote Types unit, for semantic checking purposes. 93 94 function In_Package_Declaration return Boolean; 95 -- Shared supporting routine for In_RCI_Declaration and In_RT_Declaration 96 97 function In_Shared_Passive_Unit return Boolean; 98 -- Determines if current scope is within a Shared Passive compilation unit 99 100 function Static_Discriminant_Expr (L : List_Id) return Boolean; 101 -- Iterate through the list of discriminants to check if any of them 102 -- contains non-static default expression, which is a violation in 103 -- a preelaborated library unit. 104 105 procedure Validate_Remote_Access_Object_Type_Declaration (T : Entity_Id); 106 -- Check validity of declaration if RCI or RT unit. It should not contain 107 -- the declaration of an access-to-object type unless it is a general 108 -- access type that designates a class-wide limited private type. There are 109 -- also constraints about the primitive subprograms of the class-wide type. 110 -- RM E.2 (9, 13, 14) 111 112 procedure Validate_RACW_Primitive 113 (Subp : Entity_Id; 114 RACW : Entity_Id); 115 -- Check legality of the declaration of primitive Subp of the designated 116 -- type of the given RACW type. 117 118 --------------------------------------- 119 -- Check_Categorization_Dependencies -- 120 --------------------------------------- 121 122 procedure Check_Categorization_Dependencies 123 (Unit_Entity : Entity_Id; 124 Depended_Entity : Entity_Id; 125 Info_Node : Node_Id; 126 Is_Subunit : Boolean) 127 is 128 N : constant Node_Id := Info_Node; 129 Err : Boolean; 130 131 -- Here we define an enumeration type to represent categorization types, 132 -- ordered so that a unit with a given categorization can only WITH 133 -- units with lower or equal categorization type. 134 135 type Categorization is 136 (Pure, 137 Shared_Passive, 138 Remote_Types, 139 Remote_Call_Interface, 140 Normal); 141 142 function Get_Categorization (E : Entity_Id) return Categorization; 143 -- Check categorization flags from entity, and return in the form 144 -- of the lowest value of the Categorization type that applies to E. 145 146 ------------------------ 147 -- Get_Categorization -- 148 ------------------------ 149 150 function Get_Categorization (E : Entity_Id) return Categorization is 151 begin 152 -- Get the lowest categorization that corresponds to E. Note that 153 -- nothing prevents several (different) categorization pragmas 154 -- to apply to the same library unit, in which case the unit has 155 -- all associated categories, so we need to be careful here to 156 -- check pragmas in proper Categorization order in order to 157 -- return the lowest applicable value. 158 159 -- Ignore Pure specification if set by pragma Pure_Function 160 161 if Is_Pure (E) 162 and then not 163 (Has_Pragma_Pure_Function (E) and not Has_Pragma_Pure (E)) 164 then 165 return Pure; 166 167 elsif Is_Shared_Passive (E) then 168 return Shared_Passive; 169 170 elsif Is_Remote_Types (E) then 171 return Remote_Types; 172 173 elsif Is_Remote_Call_Interface (E) then 174 return Remote_Call_Interface; 175 176 else 177 return Normal; 178 end if; 179 end Get_Categorization; 180 181 Unit_Category : Categorization; 182 With_Category : Categorization; 183 184 -- Start of processing for Check_Categorization_Dependencies 185 186 begin 187 -- Intrinsic subprograms are preelaborated, so do not impose any 188 -- categorization dependencies. 189 190 if Is_Intrinsic_Subprogram (Depended_Entity) then 191 return; 192 end if; 193 194 -- First check 10.2.1 (11/1) rules on preelaborate packages 195 196 if Is_Preelaborated (Unit_Entity) 197 and then not Is_Preelaborated (Depended_Entity) 198 and then not Is_Pure (Depended_Entity) 199 then 200 Err := True; 201 else 202 Err := False; 203 end if; 204 205 -- Check categorization rules of RM E.2(5) 206 207 Unit_Category := Get_Categorization (Unit_Entity); 208 With_Category := Get_Categorization (Depended_Entity); 209 210 if With_Category > Unit_Category then 211 212 -- Special case: Remote_Types and Remote_Call_Interface are allowed 213 -- to WITH anything in the package body, per (RM E.2(5)). 214 215 if (Unit_Category = Remote_Types 216 or else Unit_Category = Remote_Call_Interface) 217 and then In_Package_Body (Unit_Entity) 218 then 219 null; 220 221 -- Special case: Remote_Types and Remote_Call_Interface declarations 222 -- can depend on a preelaborated unit via a private with_clause, per 223 -- AI05-0206. 224 225 elsif (Unit_Category = Remote_Types 226 or else 227 Unit_Category = Remote_Call_Interface) 228 and then Nkind (N) = N_With_Clause 229 and then Private_Present (N) 230 and then Is_Preelaborated (Depended_Entity) 231 then 232 null; 233 234 -- All other cases, we do have an error 235 236 else 237 Err := True; 238 end if; 239 end if; 240 241 -- Here if we have an error 242 243 if Err then 244 245 -- These messages are warnings in GNAT mode or if the -gnateP switch 246 -- was set. Otherwise these are real errors for real illegalities. 247 248 -- The reason we suppress these errors in GNAT mode is that the run- 249 -- time has several instances of violations of the categorization 250 -- errors (e.g. Pure units withing Preelaborate units. All these 251 -- violations are harmless in the cases where we intend them, and 252 -- we suppress the warnings with Warnings (Off). In cases where we 253 -- do not intend the violation, warnings are errors in GNAT mode 254 -- anyway, so we will still get an error. 255 256 Error_Msg_Warn := 257 Treat_Categorization_Errors_As_Warnings or GNAT_Mode; 258 259 -- Don't give error if main unit is not an internal unit, and the 260 -- unit generating the message is an internal unit. This is the 261 -- situation in which such messages would be ignored in any case, 262 -- so it is convenient not to generate them (since it causes 263 -- annoying interference with debugging). 264 265 if Is_Internal_File_Name (Unit_File_Name (Current_Sem_Unit)) 266 and then not Is_Internal_File_Name (Unit_File_Name (Main_Unit)) 267 then 268 return; 269 270 -- Dependence of Remote_Types or Remote_Call_Interface declaration 271 -- on a preelaborated unit with a normal with_clause. 272 273 elsif (Unit_Category = Remote_Types 274 or else 275 Unit_Category = Remote_Call_Interface) 276 and then Is_Preelaborated (Depended_Entity) 277 then 278 Error_Msg_NE 279 ("<<must use private with clause for preelaborated unit& ", 280 N, Depended_Entity); 281 282 -- Subunit case 283 284 elsif Is_Subunit then 285 Error_Msg_NE 286 ("<subunit cannot depend on& " & 287 "(parent has wrong categorization)", N, Depended_Entity); 288 289 -- Normal unit, not subunit 290 291 else 292 Error_Msg_NE 293 ("<<cannot depend on& " & 294 "(wrong categorization)", N, Depended_Entity); 295 end if; 296 297 -- Add further explanation for Pure/Preelaborate common cases 298 299 if Unit_Category = Pure then 300 Error_Msg_NE 301 ("\<<pure unit cannot depend on non-pure unit", 302 N, Depended_Entity); 303 304 elsif Is_Preelaborated (Unit_Entity) 305 and then not Is_Preelaborated (Depended_Entity) 306 and then not Is_Pure (Depended_Entity) 307 then 308 Error_Msg_NE 309 ("\<<preelaborated unit cannot depend on " 310 & "non-preelaborated unit", 311 N, Depended_Entity); 312 end if; 313 end if; 314 end Check_Categorization_Dependencies; 315 316 ----------------------------------- 317 -- Check_Non_Static_Default_Expr -- 318 ----------------------------------- 319 320 procedure Check_Non_Static_Default_Expr 321 (Type_Def : Node_Id; 322 Obj_Decl : Node_Id) 323 is 324 Recdef : Node_Id; 325 Component_Decl : Node_Id; 326 327 begin 328 if Nkind (Type_Def) = N_Derived_Type_Definition then 329 Recdef := Record_Extension_Part (Type_Def); 330 331 if No (Recdef) then 332 return; 333 end if; 334 335 else 336 Recdef := Type_Def; 337 end if; 338 339 -- Check that component declarations do not involve: 340 341 -- a. a non-static default expression, where the object is 342 -- declared to be default initialized. 343 344 -- b. a dynamic Itype (discriminants and constraints) 345 346 if Null_Present (Recdef) then 347 return; 348 else 349 Component_Decl := First (Component_Items (Component_List (Recdef))); 350 end if; 351 352 while Present (Component_Decl) 353 and then Nkind (Component_Decl) = N_Component_Declaration 354 loop 355 if Present (Expression (Component_Decl)) 356 and then Nkind (Expression (Component_Decl)) /= N_Null 357 and then not Is_OK_Static_Expression (Expression (Component_Decl)) 358 then 359 Error_Msg_Sloc := Sloc (Component_Decl); 360 Error_Msg_F 361 ("object in preelaborated unit has non-static default#", 362 Obj_Decl); 363 364 -- Fix this later ??? 365 366 -- elsif Has_Dynamic_Itype (Component_Decl) then 367 -- Error_Msg_N 368 -- ("dynamic type discriminant," & 369 -- " constraint in preelaborated unit", 370 -- Component_Decl); 371 end if; 372 373 Next (Component_Decl); 374 end loop; 375 end Check_Non_Static_Default_Expr; 376 377 --------------------------- 378 -- Has_Non_Remote_Access -- 379 --------------------------- 380 381 function Has_Non_Remote_Access (Typ : Entity_Id) return Boolean is 382 Component : Entity_Id; 383 Comp_Type : Entity_Id; 384 U_Typ : constant Entity_Id := Underlying_Type (Typ); 385 386 begin 387 if No (U_Typ) then 388 return False; 389 390 elsif Has_Read_Write_Attributes (Typ) 391 or else Has_Read_Write_Attributes (U_Typ) 392 then 393 return False; 394 395 elsif Is_Non_Remote_Access_Type (U_Typ) then 396 return True; 397 end if; 398 399 if Is_Record_Type (U_Typ) then 400 Component := First_Entity (U_Typ); 401 while Present (Component) loop 402 if not Is_Tag (Component) then 403 Comp_Type := Etype (Component); 404 405 if Has_Non_Remote_Access (Comp_Type) then 406 return True; 407 end if; 408 end if; 409 410 Next_Entity (Component); 411 end loop; 412 413 elsif Is_Array_Type (U_Typ) then 414 return Has_Non_Remote_Access (Component_Type (U_Typ)); 415 416 end if; 417 418 return False; 419 end Has_Non_Remote_Access; 420 421 ------------------------------- 422 -- Has_Read_Write_Attributes -- 423 ------------------------------- 424 425 function Has_Read_Write_Attributes (E : Entity_Id) return Boolean is 426 begin 427 return True 428 and then Has_Stream_Attribute_Definition 429 (E, TSS_Stream_Read, At_Any_Place => True) 430 and then Has_Stream_Attribute_Definition 431 (E, TSS_Stream_Write, At_Any_Place => True); 432 end Has_Read_Write_Attributes; 433 434 ------------------------------------- 435 -- Has_Stream_Attribute_Definition -- 436 ------------------------------------- 437 438 function Has_Stream_Attribute_Definition 439 (Typ : Entity_Id; 440 Nam : TSS_Name_Type; 441 At_Any_Place : Boolean := False) return Boolean 442 is 443 Rep_Item : Node_Id; 444 Full_Type : Entity_Id := Typ; 445 446 begin 447 -- In the case of a type derived from a private view, any specified 448 -- stream attributes will be attached to the derived type's underlying 449 -- type rather the derived type entity itself (which is itself private). 450 451 if Is_Private_Type (Typ) 452 and then Is_Derived_Type (Typ) 453 and then Present (Full_View (Typ)) 454 then 455 Full_Type := Underlying_Type (Typ); 456 end if; 457 458 -- We start from the declaration node and then loop until the end of 459 -- the list until we find the requested attribute definition clause. 460 -- In Ada 2005 mode, clauses are ignored if they are not currently 461 -- visible (this is tested using the corresponding Entity, which is 462 -- inserted by the expander at the point where the clause occurs), 463 -- unless At_Any_Place is true. 464 465 Rep_Item := First_Rep_Item (Full_Type); 466 while Present (Rep_Item) loop 467 if Nkind (Rep_Item) = N_Attribute_Definition_Clause then 468 case Chars (Rep_Item) is 469 when Name_Read => 470 exit when Nam = TSS_Stream_Read; 471 472 when Name_Write => 473 exit when Nam = TSS_Stream_Write; 474 475 when Name_Input => 476 exit when Nam = TSS_Stream_Input; 477 478 when Name_Output => 479 exit when Nam = TSS_Stream_Output; 480 481 when others => 482 null; 483 484 end case; 485 end if; 486 487 Next_Rep_Item (Rep_Item); 488 end loop; 489 490 -- If At_Any_Place is true, return True if the attribute is available 491 -- at any place; if it is false, return True only if the attribute is 492 -- currently visible. 493 494 return Present (Rep_Item) 495 and then (Ada_Version < Ada_2005 496 or else At_Any_Place 497 or else not Is_Hidden (Entity (Rep_Item))); 498 end Has_Stream_Attribute_Definition; 499 500 ---------------------------- 501 -- In_Package_Declaration -- 502 ---------------------------- 503 504 function In_Package_Declaration return Boolean is 505 Unit_Kind : constant Node_Kind := 506 Nkind (Unit (Cunit (Current_Sem_Unit))); 507 508 begin 509 -- There are no restrictions on the body of an RCI or RT unit 510 511 return Is_Package_Or_Generic_Package (Current_Scope) 512 and then Unit_Kind /= N_Package_Body 513 and then not In_Package_Body (Current_Scope) 514 and then not In_Instance; 515 end In_Package_Declaration; 516 517 --------------------------- 518 -- In_Preelaborated_Unit -- 519 --------------------------- 520 521 function In_Preelaborated_Unit return Boolean is 522 Unit_Entity : Entity_Id := Current_Scope; 523 Unit_Kind : constant Node_Kind := 524 Nkind (Unit (Cunit (Current_Sem_Unit))); 525 526 begin 527 -- If evaluating actuals for a child unit instantiation, then ignore 528 -- the preelaboration status of the parent; use the child instead. 529 530 if Is_Compilation_Unit (Unit_Entity) 531 and then Unit_Kind in N_Generic_Instantiation 532 and then not In_Same_Source_Unit (Unit_Entity, 533 Cunit (Current_Sem_Unit)) 534 then 535 Unit_Entity := Cunit_Entity (Current_Sem_Unit); 536 end if; 537 538 -- There are no constraints on the body of Remote_Call_Interface or 539 -- Remote_Types packages. 540 541 return (Unit_Entity /= Standard_Standard) 542 and then (Is_Preelaborated (Unit_Entity) 543 or else Is_Pure (Unit_Entity) 544 or else Is_Shared_Passive (Unit_Entity) 545 or else 546 ((Is_Remote_Types (Unit_Entity) 547 or else Is_Remote_Call_Interface (Unit_Entity)) 548 and then Ekind (Unit_Entity) = E_Package 549 and then Unit_Kind /= N_Package_Body 550 and then not In_Package_Body (Unit_Entity) 551 and then not In_Instance)); 552 end In_Preelaborated_Unit; 553 554 ------------------ 555 -- In_Pure_Unit -- 556 ------------------ 557 558 function In_Pure_Unit return Boolean is 559 begin 560 return Is_Pure (Current_Scope); 561 end In_Pure_Unit; 562 563 ------------------------ 564 -- In_RCI_Declaration -- 565 ------------------------ 566 567 function In_RCI_Declaration return Boolean is 568 begin 569 return Is_Remote_Call_Interface (Current_Scope) 570 and then In_Package_Declaration; 571 end In_RCI_Declaration; 572 573 ----------------------- 574 -- In_RT_Declaration -- 575 ----------------------- 576 577 function In_RT_Declaration return Boolean is 578 begin 579 return Is_Remote_Types (Current_Scope) and then In_Package_Declaration; 580 end In_RT_Declaration; 581 582 ---------------------------- 583 -- In_Shared_Passive_Unit -- 584 ---------------------------- 585 586 function In_Shared_Passive_Unit return Boolean is 587 Unit_Entity : constant Entity_Id := Current_Scope; 588 589 begin 590 return Is_Shared_Passive (Unit_Entity); 591 end In_Shared_Passive_Unit; 592 593 --------------------------------------- 594 -- In_Subprogram_Task_Protected_Unit -- 595 --------------------------------------- 596 597 function In_Subprogram_Task_Protected_Unit return Boolean is 598 E : Entity_Id; 599 600 begin 601 -- The following is to verify that a declaration is inside 602 -- subprogram, generic subprogram, task unit, protected unit. 603 -- Used to validate if a lib. unit is Pure. RM 10.2.1(16). 604 605 -- Use scope chain to check successively outer scopes 606 607 E := Current_Scope; 608 loop 609 if Is_Subprogram_Or_Generic_Subprogram (E) 610 or else 611 Is_Concurrent_Type (E) 612 then 613 return True; 614 615 elsif E = Standard_Standard then 616 return False; 617 end if; 618 619 E := Scope (E); 620 end loop; 621 end In_Subprogram_Task_Protected_Unit; 622 623 ------------------------------- 624 -- Is_Non_Remote_Access_Type -- 625 ------------------------------- 626 627 function Is_Non_Remote_Access_Type (E : Entity_Id) return Boolean is 628 U_E : constant Entity_Id := Underlying_Type (Base_Type (E)); 629 -- Use full view of base type to handle subtypes properly. 630 631 begin 632 if No (U_E) then 633 634 -- This case arises for the case of a generic formal type, in which 635 -- case E.2.2(8) rules will be enforced at instantiation time. 636 637 return False; 638 end if; 639 640 return Is_Access_Type (U_E) 641 and then not Is_Remote_Access_To_Class_Wide_Type (U_E) 642 and then not Is_Remote_Access_To_Subprogram_Type (U_E); 643 end Is_Non_Remote_Access_Type; 644 645 --------------------------- 646 -- No_External_Streaming -- 647 --------------------------- 648 649 function No_External_Streaming (E : Entity_Id) return Boolean is 650 U_E : constant Entity_Id := Underlying_Type (E); 651 652 begin 653 if No (U_E) then 654 return False; 655 656 elsif Has_Read_Write_Attributes (E) then 657 658 -- Note: availability of stream attributes is tested on E, not U_E. 659 -- There may be stream attributes defined on U_E that are not visible 660 -- at the place where support of external streaming is tested. 661 662 return False; 663 664 elsif Has_Non_Remote_Access (U_E) then 665 return True; 666 end if; 667 668 return Is_Limited_Type (E); 669 end No_External_Streaming; 670 671 ------------------------------------- 672 -- Set_Categorization_From_Pragmas -- 673 ------------------------------------- 674 675 procedure Set_Categorization_From_Pragmas (N : Node_Id) is 676 P : constant Node_Id := Parent (N); 677 S : constant Entity_Id := Current_Scope; 678 679 procedure Set_Parents (Visibility : Boolean); 680 -- If this is a child instance, the parents are not immediately 681 -- visible during analysis. Make them momentarily visible so that 682 -- the argument of the pragma can be resolved properly, and reset 683 -- afterwards. 684 685 ----------------- 686 -- Set_Parents -- 687 ----------------- 688 689 procedure Set_Parents (Visibility : Boolean) is 690 Par : Entity_Id; 691 begin 692 Par := Scope (S); 693 while Present (Par) and then Par /= Standard_Standard loop 694 Set_Is_Immediately_Visible (Par, Visibility); 695 Par := Scope (Par); 696 end loop; 697 end Set_Parents; 698 699 -- Start of processing for Set_Categorization_From_Pragmas 700 701 begin 702 -- Deal with categorization pragmas in Pragmas of Compilation_Unit. 703 -- The purpose is to set categorization flags before analyzing the 704 -- unit itself, so as to diagnose violations of categorization as 705 -- we process each declaration, even though the pragma appears after 706 -- the unit. 707 708 if Nkind (P) /= N_Compilation_Unit then 709 return; 710 end if; 711 712 declare 713 PN : Node_Id; 714 715 begin 716 if Is_Child_Unit (S) and then Is_Generic_Instance (S) then 717 Set_Parents (True); 718 end if; 719 720 PN := First (Pragmas_After (Aux_Decls_Node (P))); 721 while Present (PN) loop 722 723 -- Skip implicit types that may have been introduced by 724 -- previous analysis. 725 726 if Nkind (PN) = N_Pragma then 727 case Get_Pragma_Id (PN) is 728 when Pragma_All_Calls_Remote | 729 Pragma_Preelaborate | 730 Pragma_Pure | 731 Pragma_Remote_Call_Interface | 732 Pragma_Remote_Types | 733 Pragma_Shared_Passive => Analyze (PN); 734 when others => null; 735 end case; 736 end if; 737 738 Next (PN); 739 end loop; 740 741 if Is_Child_Unit (S) and then Is_Generic_Instance (S) then 742 Set_Parents (False); 743 end if; 744 end; 745 end Set_Categorization_From_Pragmas; 746 747 ----------------------------------- 748 -- Set_Categorization_From_Scope -- 749 ----------------------------------- 750 751 procedure Set_Categorization_From_Scope (E : Entity_Id; Scop : Entity_Id) is 752 Declaration : Node_Id := Empty; 753 Specification : Node_Id := Empty; 754 755 begin 756 Set_Is_Pure 757 (E, Is_Pure (Scop) and then Is_Library_Level_Entity (E)); 758 759 if not Is_Remote_Call_Interface (E) then 760 if Ekind (E) in Subprogram_Kind then 761 Declaration := Unit_Declaration_Node (E); 762 763 if Nkind_In (Declaration, N_Subprogram_Body, 764 N_Subprogram_Renaming_Declaration) 765 then 766 Specification := Corresponding_Spec (Declaration); 767 end if; 768 end if; 769 770 -- A subprogram body or renaming-as-body is a remote call interface 771 -- if it serves as the completion of a subprogram declaration that 772 -- is a remote call interface. 773 774 if Nkind (Specification) in N_Entity then 775 Set_Is_Remote_Call_Interface 776 (E, Is_Remote_Call_Interface (Specification)); 777 778 -- A subprogram declaration is a remote call interface when it is 779 -- declared within the visible part of, or declared by, a library 780 -- unit declaration that is a remote call interface. 781 782 else 783 Set_Is_Remote_Call_Interface 784 (E, Is_Remote_Call_Interface (Scop) 785 and then not (In_Private_Part (Scop) 786 or else In_Package_Body (Scop))); 787 end if; 788 end if; 789 790 Set_Is_Remote_Types 791 (E, Is_Remote_Types (Scop) 792 and then not (In_Private_Part (Scop) 793 or else In_Package_Body (Scop))); 794 end Set_Categorization_From_Scope; 795 796 ------------------------------ 797 -- Static_Discriminant_Expr -- 798 ------------------------------ 799 800 -- We need to accommodate a Why_Not_Static call somehow here ??? 801 802 function Static_Discriminant_Expr (L : List_Id) return Boolean is 803 Discriminant_Spec : Node_Id; 804 805 begin 806 Discriminant_Spec := First (L); 807 while Present (Discriminant_Spec) loop 808 if Present (Expression (Discriminant_Spec)) 809 and then 810 not Is_OK_Static_Expression (Expression (Discriminant_Spec)) 811 then 812 return False; 813 end if; 814 815 Next (Discriminant_Spec); 816 end loop; 817 818 return True; 819 end Static_Discriminant_Expr; 820 821 -------------------------------------- 822 -- Validate_Access_Type_Declaration -- 823 -------------------------------------- 824 825 procedure Validate_Access_Type_Declaration (T : Entity_Id; N : Node_Id) is 826 Def : constant Node_Id := Type_Definition (N); 827 828 begin 829 case Nkind (Def) is 830 831 -- Access to subprogram case 832 833 when N_Access_To_Subprogram_Definition => 834 835 -- A pure library_item must not contain the declaration of a 836 -- named access type, except within a subprogram, generic 837 -- subprogram, task unit, or protected unit (RM 10.2.1(16)). 838 839 -- This test is skipped in Ada 2005 (see AI-366) 840 841 if Ada_Version < Ada_2005 842 and then Comes_From_Source (T) 843 and then In_Pure_Unit 844 and then not In_Subprogram_Task_Protected_Unit 845 then 846 Error_Msg_N ("named access type not allowed in pure unit", T); 847 end if; 848 849 -- Access to object case 850 851 when N_Access_To_Object_Definition => 852 if Comes_From_Source (T) 853 and then In_Pure_Unit 854 and then not In_Subprogram_Task_Protected_Unit 855 then 856 -- We can't give the message yet, since the type is not frozen 857 -- and in Ada 2005 mode, access types are allowed in pure units 858 -- if the type has no storage pool (see AI-366). So we set a 859 -- flag which will be checked at freeze time. 860 861 Set_Is_Pure_Unit_Access_Type (T); 862 end if; 863 864 -- Check for RCI or RT unit type declaration: declaration of an 865 -- access-to-object type is illegal unless it is a general access 866 -- type that designates a class-wide limited private type. 867 -- Note that constraints on the primitive subprograms of the 868 -- designated tagged type are not enforced here but in 869 -- Validate_RACW_Primitives, which is done separately because the 870 -- designated type might not be frozen (and therefore its 871 -- primitive operations might not be completely known) at the 872 -- point of the RACW declaration. 873 874 Validate_Remote_Access_Object_Type_Declaration (T); 875 876 -- Check for shared passive unit type declaration. It should 877 -- not contain the declaration of access to class wide type, 878 -- access to task type and access to protected type with entry. 879 880 Validate_SP_Access_Object_Type_Decl (T); 881 882 when others => 883 null; 884 end case; 885 886 -- Set categorization flag from package on entity as well, to allow 887 -- easy checks later on for required validations of RCI or RT units. 888 -- This is only done for entities that are in the original source. 889 890 if Comes_From_Source (T) 891 and then not (In_Package_Body (Scope (T)) 892 or else In_Private_Part (Scope (T))) 893 then 894 Set_Is_Remote_Call_Interface 895 (T, Is_Remote_Call_Interface (Scope (T))); 896 Set_Is_Remote_Types 897 (T, Is_Remote_Types (Scope (T))); 898 end if; 899 end Validate_Access_Type_Declaration; 900 901 ---------------------------- 902 -- Validate_Ancestor_Part -- 903 ---------------------------- 904 905 procedure Validate_Ancestor_Part (N : Node_Id) is 906 A : constant Node_Id := Ancestor_Part (N); 907 T : constant Entity_Id := Entity (A); 908 909 begin 910 if In_Preelaborated_Unit 911 and then not In_Subprogram_Or_Concurrent_Unit 912 and then (not Inside_A_Generic 913 or else Present (Enclosing_Generic_Body (N))) 914 then 915 -- If the type is private, it must have the Ada 2005 pragma 916 -- Has_Preelaborable_Initialization. 917 918 -- The check is omitted within predefined units. This is probably 919 -- obsolete code to fix the Ada 95 weakness in this area ??? 920 921 if Is_Private_Type (T) 922 and then not Has_Pragma_Preelab_Init (T) 923 and then not Is_Internal_File_Name 924 (Unit_File_Name (Get_Source_Unit (N))) 925 then 926 Error_Msg_N 927 ("private ancestor type not allowed in preelaborated unit", A); 928 929 elsif Is_Record_Type (T) then 930 if Nkind (Parent (T)) = N_Full_Type_Declaration then 931 Check_Non_Static_Default_Expr 932 (Type_Definition (Parent (T)), A); 933 end if; 934 end if; 935 end if; 936 end Validate_Ancestor_Part; 937 938 ---------------------------------------- 939 -- Validate_Categorization_Dependency -- 940 ---------------------------------------- 941 942 procedure Validate_Categorization_Dependency 943 (N : Node_Id; 944 E : Entity_Id) 945 is 946 K : constant Node_Kind := Nkind (N); 947 P : Node_Id := Parent (N); 948 U : Entity_Id := E; 949 Is_Subunit : constant Boolean := Nkind (P) = N_Subunit; 950 951 begin 952 -- Only validate library units and subunits. For subunits, checks 953 -- concerning withed units apply to the parent compilation unit. 954 955 if Is_Subunit then 956 P := Parent (P); 957 U := Scope (E); 958 959 while Present (U) 960 and then not Is_Compilation_Unit (U) 961 and then not Is_Child_Unit (U) 962 loop 963 U := Scope (U); 964 end loop; 965 end if; 966 967 if Nkind (P) /= N_Compilation_Unit then 968 return; 969 end if; 970 971 -- Body of RCI unit does not need validation 972 973 if Is_Remote_Call_Interface (E) 974 and then Nkind_In (N, N_Package_Body, N_Subprogram_Body) 975 then 976 return; 977 end if; 978 979 -- Ada 2005 (AI-50217): Process explicit non-limited with_clauses 980 981 declare 982 Item : Node_Id; 983 Entity_Of_Withed : Entity_Id; 984 985 begin 986 Item := First (Context_Items (P)); 987 while Present (Item) loop 988 if Nkind (Item) = N_With_Clause 989 and then not (Implicit_With (Item) 990 or else Limited_Present (Item) 991 992 -- Skip if error already posted on the WITH 993 -- clause (in which case the Name attribute 994 -- may be invalid). In particular, this fixes 995 -- the problem of hanging in the presence of a 996 -- WITH clause on a child that is an illegal 997 -- generic instantiation. 998 999 or else Error_Posted (Item)) 1000 then 1001 Entity_Of_Withed := Entity (Name (Item)); 1002 Check_Categorization_Dependencies 1003 (U, Entity_Of_Withed, Item, Is_Subunit); 1004 end if; 1005 1006 Next (Item); 1007 end loop; 1008 end; 1009 1010 -- Child depends on parent; therefore parent should also be categorized 1011 -- and satisfy the dependency hierarchy. 1012 1013 -- Check if N is a child spec 1014 1015 if (K in N_Generic_Declaration or else 1016 K in N_Generic_Instantiation or else 1017 K in N_Generic_Renaming_Declaration or else 1018 K = N_Package_Declaration or else 1019 K = N_Package_Renaming_Declaration or else 1020 K = N_Subprogram_Declaration or else 1021 K = N_Subprogram_Renaming_Declaration) 1022 and then Present (Parent_Spec (N)) 1023 then 1024 Check_Categorization_Dependencies (E, Scope (E), N, False); 1025 1026 -- Verify that public child of an RCI library unit must also be an 1027 -- RCI library unit (RM E.2.3(15)). 1028 1029 if Is_Remote_Call_Interface (Scope (E)) 1030 and then not Private_Present (P) 1031 and then not Is_Remote_Call_Interface (E) 1032 then 1033 Error_Msg_N ("public child of rci unit must also be rci unit", N); 1034 end if; 1035 end if; 1036 end Validate_Categorization_Dependency; 1037 1038 -------------------------------- 1039 -- Validate_Controlled_Object -- 1040 -------------------------------- 1041 1042 procedure Validate_Controlled_Object (E : Entity_Id) is 1043 begin 1044 -- Don't need this check in Ada 2005 mode, where this is all taken 1045 -- care of by the mechanism for Preelaborable Initialization. 1046 1047 if Ada_Version >= Ada_2005 then 1048 return; 1049 end if; 1050 1051 -- For now, never apply this check for internal GNAT units, since we 1052 -- have a number of cases in the library where we are stuck with objects 1053 -- of this type, and the RM requires Preelaborate. 1054 1055 -- For similar reasons, we only do this check for source entities, since 1056 -- we generate entities of this type in some situations. 1057 1058 -- Note that the 10.2.1(9) restrictions are not relevant to us anyway. 1059 -- We have to enforce them for RM compatibility, but we have no trouble 1060 -- accepting these objects and doing the right thing. Note that there is 1061 -- no requirement that Preelaborate not actually generate any code. 1062 1063 if In_Preelaborated_Unit 1064 and then not Debug_Flag_PP 1065 and then Comes_From_Source (E) 1066 and then not 1067 Is_Internal_File_Name (Unit_File_Name (Get_Source_Unit (E))) 1068 and then (not Inside_A_Generic 1069 or else Present (Enclosing_Generic_Body (E))) 1070 and then not Is_Protected_Type (Etype (E)) 1071 then 1072 Error_Msg_N 1073 ("library level controlled object not allowed in " & 1074 "preelaborated unit", E); 1075 end if; 1076 end Validate_Controlled_Object; 1077 1078 -------------------------------------- 1079 -- Validate_Null_Statement_Sequence -- 1080 -------------------------------------- 1081 1082 procedure Validate_Null_Statement_Sequence (N : Node_Id) is 1083 Item : Node_Id; 1084 1085 begin 1086 if In_Preelaborated_Unit then 1087 Item := First (Statements (Handled_Statement_Sequence (N))); 1088 while Present (Item) loop 1089 if Nkind (Item) /= N_Label 1090 and then Nkind (Item) /= N_Null_Statement 1091 then 1092 -- In GNAT mode, this is a warning, allowing the run-time 1093 -- to judiciously bypass this error condition. 1094 1095 Error_Msg_Warn := GNAT_Mode; 1096 Error_Msg_N 1097 ("<<statements not allowed in preelaborated unit", Item); 1098 1099 exit; 1100 end if; 1101 1102 Next (Item); 1103 end loop; 1104 end if; 1105 end Validate_Null_Statement_Sequence; 1106 1107 --------------------------------- 1108 -- Validate_Object_Declaration -- 1109 --------------------------------- 1110 1111 procedure Validate_Object_Declaration (N : Node_Id) is 1112 Id : constant Entity_Id := Defining_Identifier (N); 1113 E : constant Node_Id := Expression (N); 1114 Odf : constant Node_Id := Object_Definition (N); 1115 T : constant Entity_Id := Etype (Id); 1116 1117 begin 1118 -- Verify that any access to subprogram object does not have in its 1119 -- subprogram profile access type parameters or limited parameters 1120 -- without Read and Write attributes (E.2.3(13)). 1121 1122 Validate_RCI_Subprogram_Declaration (N); 1123 1124 -- Check that if we are in preelaborated elaboration code, then we 1125 -- do not have an instance of a default initialized private, task or 1126 -- protected object declaration which would violate (RM 10.2.1(9)). 1127 -- Note that constants are never default initialized (and the test 1128 -- below also filters out deferred constants). A variable is default 1129 -- initialized if it does *not* have an initialization expression. 1130 1131 -- Filter out cases that are not declaration of a variable from source 1132 1133 if Nkind (N) /= N_Object_Declaration 1134 or else Constant_Present (N) 1135 or else not Comes_From_Source (Id) 1136 then 1137 return; 1138 end if; 1139 1140 -- Exclude generic specs from the checks (this will get rechecked 1141 -- on instantiations). 1142 1143 if Inside_A_Generic and then No (Enclosing_Generic_Body (Id)) then 1144 return; 1145 end if; 1146 1147 -- Required checks for declaration that is in a preelaborated package 1148 -- and is not within some subprogram. 1149 1150 if In_Preelaborated_Unit 1151 and then not In_Subprogram_Or_Concurrent_Unit 1152 then 1153 -- Check for default initialized variable case. Note that in 1154 -- accordance with (RM B.1(24)) imported objects are not subject to 1155 -- default initialization. 1156 -- If the initialization does not come from source and is an 1157 -- aggregate, it is a static initialization that replaces an 1158 -- implicit call, and must be treated as such. 1159 1160 if Present (E) 1161 and then (Comes_From_Source (E) or else Nkind (E) /= N_Aggregate) 1162 then 1163 null; 1164 1165 elsif Is_Imported (Id) then 1166 null; 1167 1168 else 1169 declare 1170 Ent : Entity_Id := T; 1171 1172 begin 1173 -- An array whose component type is a record with nonstatic 1174 -- default expressions is a violation, so we get the array's 1175 -- component type. 1176 1177 if Is_Array_Type (Ent) then 1178 declare 1179 Comp_Type : Entity_Id; 1180 1181 begin 1182 Comp_Type := Component_Type (Ent); 1183 while Is_Array_Type (Comp_Type) loop 1184 Comp_Type := Component_Type (Comp_Type); 1185 end loop; 1186 1187 Ent := Comp_Type; 1188 end; 1189 end if; 1190 1191 -- Object decl. that is of record type and has no default expr. 1192 -- should check if there is any non-static default expression 1193 -- in component decl. of the record type decl. 1194 1195 if Is_Record_Type (Ent) then 1196 if Nkind (Parent (Ent)) = N_Full_Type_Declaration then 1197 Check_Non_Static_Default_Expr 1198 (Type_Definition (Parent (Ent)), N); 1199 1200 elsif Nkind (Odf) = N_Subtype_Indication 1201 and then not Is_Array_Type (T) 1202 and then not Is_Private_Type (T) 1203 then 1204 Check_Non_Static_Default_Expr (Type_Definition 1205 (Parent (Entity (Subtype_Mark (Odf)))), N); 1206 end if; 1207 end if; 1208 1209 -- Check for invalid use of private object. Note that Ada 2005 1210 -- AI-161 modifies the rules for Ada 2005, including the use of 1211 -- the new pragma Preelaborable_Initialization. 1212 1213 if Is_Private_Type (Ent) 1214 or else Depends_On_Private (Ent) 1215 then 1216 -- Case where type has preelaborable initialization which 1217 -- means that a pragma Preelaborable_Initialization was 1218 -- given for the private type. 1219 1220 if Relaxed_RM_Semantics then 1221 1222 -- In relaxed mode, do not issue these messages, this 1223 -- is basically similar to the GNAT_Mode test below. 1224 1225 null; 1226 1227 elsif Has_Preelaborable_Initialization (Ent) then 1228 1229 -- But for the predefined units, we will ignore this 1230 -- status unless we are in Ada 2005 mode since we want 1231 -- Ada 95 compatible behavior, in which the entities 1232 -- marked with this pragma in the predefined library are 1233 -- not treated specially. 1234 1235 if Ada_Version < Ada_2005 then 1236 Error_Msg_N 1237 ("private object not allowed in preelaborated unit", 1238 N); 1239 Error_Msg_N ("\(would be legal in Ada 2005 mode)", N); 1240 end if; 1241 1242 -- Type does not have preelaborable initialization 1243 1244 else 1245 -- We allow this when compiling in GNAT mode to make life 1246 -- easier for some cases where it would otherwise be hard 1247 -- to be exactly valid Ada. 1248 1249 if not GNAT_Mode then 1250 Error_Msg_N 1251 ("private object not allowed in preelaborated unit", 1252 N); 1253 1254 -- Add a message if it would help to provide a pragma 1255 -- Preelaborable_Initialization on the type of the 1256 -- object (which would make it legal in Ada 2005). 1257 1258 -- If the type has no full view (generic type, or 1259 -- previous error), the warning does not apply. 1260 1261 if Is_Private_Type (Ent) 1262 and then Present (Full_View (Ent)) 1263 and then 1264 Has_Preelaborable_Initialization (Full_View (Ent)) 1265 then 1266 Error_Msg_Sloc := Sloc (Ent); 1267 1268 if Ada_Version >= Ada_2005 then 1269 Error_Msg_NE 1270 ("\would be legal if pragma Preelaborable_" & 1271 "Initialization given for & #", N, Ent); 1272 else 1273 Error_Msg_NE 1274 ("\would be legal in Ada 2005 if pragma " & 1275 "Preelaborable_Initialization given for & #", 1276 N, Ent); 1277 end if; 1278 end if; 1279 end if; 1280 end if; 1281 1282 -- Access to Task or Protected type 1283 1284 elsif Is_Entity_Name (Odf) 1285 and then Present (Etype (Odf)) 1286 and then Is_Access_Type (Etype (Odf)) 1287 then 1288 Ent := Designated_Type (Etype (Odf)); 1289 1290 elsif Is_Entity_Name (Odf) then 1291 Ent := Entity (Odf); 1292 1293 elsif Nkind (Odf) = N_Subtype_Indication then 1294 Ent := Etype (Subtype_Mark (Odf)); 1295 1296 elsif Nkind (Odf) = N_Constrained_Array_Definition then 1297 Ent := Component_Type (T); 1298 end if; 1299 1300 if Is_Task_Type (Ent) 1301 or else (Is_Protected_Type (Ent) and then Has_Entries (Ent)) 1302 then 1303 Error_Msg_N 1304 ("concurrent object not allowed in preelaborated unit", 1305 N); 1306 return; 1307 end if; 1308 end; 1309 end if; 1310 1311 -- Non-static discriminants not allowed in preelaborated unit. 1312 -- Objects of a controlled type with a user-defined Initialize 1313 -- are forbidden as well. 1314 1315 if Is_Record_Type (Etype (Id)) then 1316 declare 1317 ET : constant Entity_Id := Etype (Id); 1318 EE : constant Entity_Id := Etype (Etype (Id)); 1319 PEE : Node_Id; 1320 1321 begin 1322 if Has_Discriminants (ET) and then Present (EE) then 1323 PEE := Parent (EE); 1324 1325 if Nkind (PEE) = N_Full_Type_Declaration 1326 and then not Static_Discriminant_Expr 1327 (Discriminant_Specifications (PEE)) 1328 then 1329 Error_Msg_N 1330 ("non-static discriminant in preelaborated unit", 1331 PEE); 1332 end if; 1333 end if; 1334 1335 -- For controlled type or type with controlled component, check 1336 -- preelaboration flag, as there may be a non-null Initialize 1337 -- primitive. For language versions earlier than Ada 2005, 1338 -- there is no notion of preelaborable initialization, and 1339 -- Validate_Controlled_Object is used to enforce rules for 1340 -- controlled objects. 1341 1342 if (Is_Controlled (ET) or else Has_Controlled_Component (ET)) 1343 and then Ada_Version >= Ada_2005 1344 and then not Has_Preelaborable_Initialization (ET) 1345 then 1346 Error_Msg_NE 1347 ("controlled type& does not have" 1348 & " preelaborable initialization", N, ET); 1349 end if; 1350 end; 1351 1352 end if; 1353 end if; 1354 1355 -- A pure library_item must not contain the declaration of any variable 1356 -- except within a subprogram, generic subprogram, task unit, or 1357 -- protected unit (RM 10.2.1(16)). 1358 1359 if In_Pure_Unit and then not In_Subprogram_Task_Protected_Unit then 1360 Error_Msg_N ("declaration of variable not allowed in pure unit", N); 1361 1362 elsif not In_Private_Part (Id) then 1363 1364 -- The visible part of an RCI library unit must not contain the 1365 -- declaration of a variable (RM E.1.3(9)). 1366 1367 if In_RCI_Declaration then 1368 Error_Msg_N ("visible variable not allowed in 'R'C'I unit", N); 1369 1370 -- The visible part of a Shared Passive library unit must not contain 1371 -- the declaration of a variable (RM E.2.2(7)). 1372 1373 elsif In_RT_Declaration then 1374 Error_Msg_N 1375 ("visible variable not allowed in remote types unit", N); 1376 end if; 1377 end if; 1378 end Validate_Object_Declaration; 1379 1380 ----------------------------- 1381 -- Validate_RACW_Primitive -- 1382 ----------------------------- 1383 1384 procedure Validate_RACW_Primitive 1385 (Subp : Entity_Id; 1386 RACW : Entity_Id) 1387 is 1388 procedure Illegal_Remote_Subp (Msg : String; N : Node_Id); 1389 -- Diagnose illegality on N. If RACW is present, report the error on it 1390 -- rather than on N. 1391 1392 ------------------------- 1393 -- Illegal_Remote_Subp -- 1394 ------------------------- 1395 1396 procedure Illegal_Remote_Subp (Msg : String; N : Node_Id) is 1397 begin 1398 if Present (RACW) then 1399 if not Error_Posted (RACW) then 1400 Error_Msg_N 1401 ("illegal remote access to class-wide type&", RACW); 1402 end if; 1403 1404 Error_Msg_Sloc := Sloc (N); 1405 Error_Msg_NE ("\\" & Msg & " in primitive& #", RACW, Subp); 1406 1407 else 1408 Error_Msg_NE (Msg & " in remote subprogram&", N, Subp); 1409 end if; 1410 end Illegal_Remote_Subp; 1411 1412 Rtyp : Entity_Id; 1413 Param : Node_Id; 1414 Param_Spec : Node_Id; 1415 Param_Type : Entity_Id; 1416 1417 -- Start of processing for Validate_RACW_Primitive 1418 1419 begin 1420 -- Check return type 1421 1422 if Ekind (Subp) = E_Function then 1423 Rtyp := Etype (Subp); 1424 1425 -- AI05-0101 (Binding Interpretation): The result type of a remote 1426 -- function must either support external streaming or be a 1427 -- controlling access result type. 1428 1429 if Has_Controlling_Result (Subp) then 1430 null; 1431 1432 elsif Ekind (Rtyp) = E_Anonymous_Access_Type then 1433 Illegal_Remote_Subp ("anonymous access result", Rtyp); 1434 1435 elsif Is_Limited_Type (Rtyp) then 1436 if No (TSS (Rtyp, TSS_Stream_Read)) 1437 or else 1438 No (TSS (Rtyp, TSS_Stream_Write)) 1439 then 1440 Illegal_Remote_Subp 1441 ("limited return type must have Read and Write attributes", 1442 Parent (Subp)); 1443 Explain_Limited_Type (Rtyp, Parent (Subp)); 1444 end if; 1445 1446 -- Check that the return type supports external streaming 1447 1448 elsif No_External_Streaming (Rtyp) 1449 and then not Error_Posted (Rtyp) 1450 then 1451 Illegal_Remote_Subp ("return type containing non-remote access " 1452 & "must have Read and Write attributes", 1453 Parent (Subp)); 1454 end if; 1455 end if; 1456 1457 Param := First_Formal (Subp); 1458 while Present (Param) loop 1459 1460 -- Now find out if this parameter is a controlling parameter 1461 1462 Param_Spec := Parent (Param); 1463 Param_Type := Etype (Param); 1464 1465 if Is_Controlling_Formal (Param) then 1466 1467 -- It is a controlling parameter, so specific checks below do not 1468 -- apply. 1469 1470 null; 1471 1472 elsif Ekind_In (Param_Type, E_Anonymous_Access_Type, 1473 E_Anonymous_Access_Subprogram_Type) 1474 then 1475 -- From RM E.2.2(14), no anonymous access parameter other than 1476 -- controlling ones may be used (because an anonymous access 1477 -- type never supports external streaming). 1478 1479 Illegal_Remote_Subp 1480 ("non-controlling access parameter", Param_Spec); 1481 1482 elsif No_External_Streaming (Param_Type) 1483 and then not Error_Posted (Param_Type) 1484 then 1485 Illegal_Remote_Subp ("formal parameter in remote subprogram must " 1486 & "support external streaming", Param_Spec); 1487 end if; 1488 1489 -- Check next parameter in this subprogram 1490 1491 Next_Formal (Param); 1492 end loop; 1493 end Validate_RACW_Primitive; 1494 1495 ------------------------------ 1496 -- Validate_RACW_Primitives -- 1497 ------------------------------ 1498 1499 procedure Validate_RACW_Primitives (T : Entity_Id) is 1500 Desig_Type : Entity_Id; 1501 Primitive_Subprograms : Elist_Id; 1502 Subprogram_Elmt : Elmt_Id; 1503 Subprogram : Entity_Id; 1504 1505 begin 1506 Desig_Type := Etype (Designated_Type (T)); 1507 1508 -- No action needed for concurrent types 1509 1510 if Is_Concurrent_Type (Desig_Type) then 1511 return; 1512 end if; 1513 1514 Primitive_Subprograms := Primitive_Operations (Desig_Type); 1515 1516 Subprogram_Elmt := First_Elmt (Primitive_Subprograms); 1517 while Subprogram_Elmt /= No_Elmt loop 1518 Subprogram := Node (Subprogram_Elmt); 1519 1520 if Is_Predefined_Dispatching_Operation (Subprogram) 1521 or else Is_Hidden (Subprogram) 1522 then 1523 goto Next_Subprogram; 1524 end if; 1525 1526 Validate_RACW_Primitive (Subp => Subprogram, RACW => T); 1527 1528 <<Next_Subprogram>> 1529 Next_Elmt (Subprogram_Elmt); 1530 end loop; 1531 end Validate_RACW_Primitives; 1532 1533 ------------------------------- 1534 -- Validate_RCI_Declarations -- 1535 ------------------------------- 1536 1537 procedure Validate_RCI_Declarations (P : Entity_Id) is 1538 E : Entity_Id; 1539 1540 begin 1541 E := First_Entity (P); 1542 while Present (E) loop 1543 if Comes_From_Source (E) then 1544 if Is_Limited_Type (E) then 1545 Error_Msg_N 1546 ("limited type not allowed in rci unit", Parent (E)); 1547 Explain_Limited_Type (E, Parent (E)); 1548 1549 elsif Ekind_In (E, E_Generic_Function, 1550 E_Generic_Package, 1551 E_Generic_Procedure) 1552 then 1553 Error_Msg_N ("generic declaration not allowed in rci unit", 1554 Parent (E)); 1555 1556 elsif (Ekind (E) = E_Function or else Ekind (E) = E_Procedure) 1557 and then Has_Pragma_Inline (E) 1558 then 1559 Error_Msg_N 1560 ("inlined subprogram not allowed in rci unit", Parent (E)); 1561 1562 -- Inner packages that are renamings need not be checked. Generic 1563 -- RCI packages are subject to the checks, but entities that come 1564 -- from formal packages are not part of the visible declarations 1565 -- of the package and are not checked. 1566 1567 elsif Ekind (E) = E_Package then 1568 if Present (Renamed_Entity (E)) then 1569 null; 1570 1571 elsif Ekind (P) /= E_Generic_Package 1572 or else List_Containing (Unit_Declaration_Node (E)) /= 1573 Generic_Formal_Declarations 1574 (Unit_Declaration_Node (P)) 1575 then 1576 Validate_RCI_Declarations (E); 1577 end if; 1578 end if; 1579 end if; 1580 1581 Next_Entity (E); 1582 end loop; 1583 end Validate_RCI_Declarations; 1584 1585 ----------------------------------------- 1586 -- Validate_RCI_Subprogram_Declaration -- 1587 ----------------------------------------- 1588 1589 procedure Validate_RCI_Subprogram_Declaration (N : Node_Id) is 1590 K : constant Node_Kind := Nkind (N); 1591 Profile : List_Id; 1592 Id : constant Entity_Id := Defining_Entity (N); 1593 Param_Spec : Node_Id; 1594 Param_Type : Entity_Id; 1595 Error_Node : Node_Id := N; 1596 1597 begin 1598 -- This procedure enforces rules on subprogram and access to subprogram 1599 -- declarations in RCI units. These rules do not apply to expander 1600 -- generated routines, which are not remote subprograms. It is called: 1601 1602 -- 1. from Analyze_Subprogram_Declaration. 1603 -- 2. from Validate_Object_Declaration (access to subprogram). 1604 1605 if not (Comes_From_Source (N) 1606 and then In_RCI_Declaration 1607 and then not In_Private_Part (Scope (Id))) 1608 then 1609 return; 1610 end if; 1611 1612 if K = N_Subprogram_Declaration then 1613 Profile := Parameter_Specifications (Specification (N)); 1614 1615 else 1616 pragma Assert (K = N_Object_Declaration); 1617 1618 -- The above assertion is dubious, the visible declarations of an 1619 -- RCI unit never contain an object declaration, this should be an 1620 -- ACCESS-to-object declaration??? 1621 1622 if Nkind (Id) = N_Defining_Identifier 1623 and then Nkind (Parent (Etype (Id))) = N_Full_Type_Declaration 1624 and then Ekind (Etype (Id)) = E_Access_Subprogram_Type 1625 then 1626 Profile := 1627 Parameter_Specifications (Type_Definition (Parent (Etype (Id)))); 1628 else 1629 return; 1630 end if; 1631 end if; 1632 1633 -- Iterate through the parameter specification list, checking that 1634 -- no access parameter and no limited type parameter in the list. 1635 -- RM E.2.3(14). 1636 1637 if Present (Profile) then 1638 Param_Spec := First (Profile); 1639 while Present (Param_Spec) loop 1640 Param_Type := Etype (Defining_Identifier (Param_Spec)); 1641 1642 if Ekind (Param_Type) = E_Anonymous_Access_Type then 1643 if K = N_Subprogram_Declaration then 1644 Error_Node := Param_Spec; 1645 end if; 1646 1647 -- Report error only if declaration is in source program 1648 1649 if Comes_From_Source (Id) then 1650 Error_Msg_N 1651 ("subprogram in 'R'C'I unit cannot have access parameter", 1652 Error_Node); 1653 end if; 1654 1655 -- For a limited private type parameter, we check only the private 1656 -- declaration and ignore full type declaration, unless this is 1657 -- the only declaration for the type, e.g., as a limited record. 1658 1659 elsif No_External_Streaming (Param_Type) then 1660 if K = N_Subprogram_Declaration then 1661 Error_Node := Param_Spec; 1662 end if; 1663 1664 Error_Msg_NE 1665 ("formal of remote subprogram& " 1666 & "must support external streaming", 1667 Error_Node, Id); 1668 if Is_Limited_Type (Param_Type) then 1669 Explain_Limited_Type (Param_Type, Error_Node); 1670 end if; 1671 end if; 1672 1673 Next (Param_Spec); 1674 end loop; 1675 end if; 1676 1677 if Ekind (Id) = E_Function 1678 and then Ekind (Etype (Id)) = E_Anonymous_Access_Type 1679 and then Comes_From_Source (Id) 1680 then 1681 Error_Msg_N 1682 ("function in 'R'C'I unit cannot have access result", 1683 Error_Node); 1684 end if; 1685 end Validate_RCI_Subprogram_Declaration; 1686 1687 ---------------------------------------------------- 1688 -- Validate_Remote_Access_Object_Type_Declaration -- 1689 ---------------------------------------------------- 1690 1691 procedure Validate_Remote_Access_Object_Type_Declaration (T : Entity_Id) is 1692 Direct_Designated_Type : Entity_Id; 1693 Desig_Type : Entity_Id; 1694 1695 begin 1696 -- We are called from Analyze_Full_Type_Declaration, and the Nkind of 1697 -- the given node is N_Access_To_Object_Definition. 1698 1699 if not Comes_From_Source (T) 1700 or else (not In_RCI_Declaration and then not In_RT_Declaration) 1701 then 1702 return; 1703 end if; 1704 1705 -- An access definition in the private part of a package is not a 1706 -- remote access type. Restrictions related to external streaming 1707 -- support for non-remote access types are enforced elsewhere. Note 1708 -- that In_Private_Part is never set on type entities: check flag 1709 -- on enclosing scope. 1710 1711 if In_Private_Part (Scope (T)) then 1712 return; 1713 end if; 1714 1715 -- Check RCI or RT unit type declaration. It may not contain the 1716 -- declaration of an access-to-object type unless it is a general access 1717 -- type that designates a class-wide limited private type or subtype. 1718 -- There are also constraints on the primitive subprograms of the 1719 -- class-wide type (RM E.2.2(14), see Validate_RACW_Primitives). 1720 1721 if Ekind (T) /= E_General_Access_Type 1722 or else not Is_Class_Wide_Type (Designated_Type (T)) 1723 then 1724 if In_RCI_Declaration then 1725 Error_Msg_N 1726 ("error in access type in Remote_Call_Interface unit", T); 1727 else 1728 Error_Msg_N 1729 ("error in access type in Remote_Types unit", T); 1730 end if; 1731 1732 Error_Msg_N ("\must be general access to class-wide type", T); 1733 return; 1734 end if; 1735 1736 Direct_Designated_Type := Designated_Type (T); 1737 Desig_Type := Etype (Direct_Designated_Type); 1738 1739 -- Why is this check not in Validate_Remote_Access_To_Class_Wide_Type??? 1740 1741 if not Is_Valid_Remote_Object_Type (Desig_Type) then 1742 Error_Msg_N 1743 ("error in designated type of remote access to class-wide type", T); 1744 Error_Msg_N 1745 ("\must be tagged limited private or private extension", T); 1746 return; 1747 end if; 1748 end Validate_Remote_Access_Object_Type_Declaration; 1749 1750 ----------------------------------------------- 1751 -- Validate_Remote_Access_To_Class_Wide_Type -- 1752 ----------------------------------------------- 1753 1754 procedure Validate_Remote_Access_To_Class_Wide_Type (N : Node_Id) is 1755 K : constant Node_Kind := Nkind (N); 1756 PK : constant Node_Kind := Nkind (Parent (N)); 1757 E : Entity_Id; 1758 1759 begin 1760 -- This subprogram enforces the checks in (RM E.2.2(8)) for certain uses 1761 -- of class-wide limited private types. 1762 1763 -- Storage_Pool and Storage_Size are not defined for such types 1764 -- 1765 -- The expected type of allocator must not be such a type. 1766 1767 -- The actual parameter of generic instantiation must not be such a 1768 -- type if the formal parameter is of an access type. 1769 1770 -- On entry, there are several cases: 1771 1772 -- 1. called from sem_attr Analyze_Attribute where attribute name is 1773 -- either Storage_Pool or Storage_Size. 1774 1775 -- 2. called from exp_ch4 Expand_N_Allocator 1776 1777 -- 3. called from sem_ch4 Analyze_Explicit_Dereference 1778 1779 -- 4. called from sem_res Resolve_Actuals 1780 1781 if K = N_Attribute_Reference then 1782 E := Etype (Prefix (N)); 1783 1784 if Is_Remote_Access_To_Class_Wide_Type (E) then 1785 Error_Msg_N ("incorrect attribute of remote operand", N); 1786 return; 1787 end if; 1788 1789 elsif K = N_Allocator then 1790 E := Etype (N); 1791 1792 if Is_Remote_Access_To_Class_Wide_Type (E) then 1793 Error_Msg_N ("incorrect expected remote type of allocator", N); 1794 return; 1795 end if; 1796 1797 -- This subprogram also enforces the checks in E.2.2(13). A value of 1798 -- such type must not be dereferenced unless as controlling operand of 1799 -- a dispatching call. Explicit dereferences not coming from source are 1800 -- exempted from this checking because the expander produces them in 1801 -- some cases (such as for tag checks on dispatching calls with multiple 1802 -- controlling operands). However we do check in the case of an implicit 1803 -- dereference that is expanded to an explicit dereference (hence the 1804 -- test of whether Original_Node (N) comes from source). 1805 1806 elsif K = N_Explicit_Dereference 1807 and then Comes_From_Source (Original_Node (N)) 1808 then 1809 E := Etype (Prefix (N)); 1810 1811 -- If the class-wide type is not a remote one, the restrictions 1812 -- do not apply. 1813 1814 if not Is_Remote_Access_To_Class_Wide_Type (E) then 1815 return; 1816 end if; 1817 1818 -- If we have a true dereference that comes from source and that 1819 -- is a controlling argument for a dispatching call, accept it. 1820 1821 if Is_Actual_Parameter (N) and then Is_Controlling_Actual (N) then 1822 return; 1823 end if; 1824 1825 -- If we are just within a procedure or function call and the 1826 -- dereference has not been analyzed, return because this procedure 1827 -- will be called again from sem_res Resolve_Actuals. The same can 1828 -- apply in the case of dereference that is the prefix of a selected 1829 -- component, which can be a call given in prefixed form. 1830 1831 if (Is_Actual_Parameter (N) or else PK = N_Selected_Component) 1832 and then not Analyzed (N) 1833 then 1834 return; 1835 end if; 1836 1837 -- We must allow expanded code to generate a reference to the tag of 1838 -- the designated object (may be either the actual tag, or the stub 1839 -- tag in the case of a remote object). 1840 1841 if PK = N_Selected_Component 1842 and then Is_Tag (Entity (Selector_Name (Parent (N)))) 1843 then 1844 return; 1845 end if; 1846 1847 Error_Msg_N 1848 ("invalid dereference of a remote access-to-class-wide value", N); 1849 end if; 1850 end Validate_Remote_Access_To_Class_Wide_Type; 1851 1852 ------------------------------------------ 1853 -- Validate_Remote_Type_Type_Conversion -- 1854 ------------------------------------------ 1855 1856 procedure Validate_Remote_Type_Type_Conversion (N : Node_Id) is 1857 S : constant Entity_Id := Etype (N); 1858 E : constant Entity_Id := Etype (Expression (N)); 1859 1860 begin 1861 -- This test is required in the case where a conversion appears inside a 1862 -- normal package, it does not necessarily have to be inside an RCI, 1863 -- Remote_Types unit (RM E.2.2(9,12)). 1864 1865 if Is_Remote_Access_To_Subprogram_Type (E) 1866 and then not Is_Remote_Access_To_Subprogram_Type (S) 1867 then 1868 Error_Msg_N 1869 ("incorrect conversion of remote operand to local type", N); 1870 return; 1871 1872 elsif not Is_Remote_Access_To_Subprogram_Type (E) 1873 and then Is_Remote_Access_To_Subprogram_Type (S) 1874 then 1875 Error_Msg_N 1876 ("incorrect conversion of local operand to remote type", N); 1877 return; 1878 1879 elsif Is_Remote_Access_To_Class_Wide_Type (E) 1880 and then not Is_Remote_Access_To_Class_Wide_Type (S) 1881 then 1882 Error_Msg_N 1883 ("incorrect conversion of remote operand to local type", N); 1884 return; 1885 end if; 1886 1887 -- If a local access type is converted into a RACW type, then the 1888 -- current unit has a pointer that may now be exported to another 1889 -- partition. 1890 1891 if Is_Remote_Access_To_Class_Wide_Type (S) 1892 and then not Is_Remote_Access_To_Class_Wide_Type (E) 1893 then 1894 Set_Has_RACW (Current_Sem_Unit); 1895 end if; 1896 end Validate_Remote_Type_Type_Conversion; 1897 1898 ------------------------------- 1899 -- Validate_RT_RAT_Component -- 1900 ------------------------------- 1901 1902 procedure Validate_RT_RAT_Component (N : Node_Id) is 1903 Spec : constant Node_Id := Specification (N); 1904 Name_U : constant Entity_Id := Defining_Entity (Spec); 1905 Typ : Entity_Id; 1906 U_Typ : Entity_Id; 1907 First_Priv_Ent : constant Entity_Id := First_Private_Entity (Name_U); 1908 1909 function Stream_Attributes_Available (Typ : Entity_Id) return Boolean; 1910 -- True if any stream attribute is available for Typ 1911 1912 --------------------------------- 1913 -- Stream_Attributes_Available -- 1914 --------------------------------- 1915 1916 function Stream_Attributes_Available (Typ : Entity_Id) return Boolean 1917 is 1918 begin 1919 return Stream_Attribute_Available (Typ, TSS_Stream_Read) 1920 or else 1921 Stream_Attribute_Available (Typ, TSS_Stream_Write) 1922 or else 1923 Stream_Attribute_Available (Typ, TSS_Stream_Input) 1924 or else 1925 Stream_Attribute_Available (Typ, TSS_Stream_Output); 1926 end Stream_Attributes_Available; 1927 1928 -- Start of processing for Validate_RT_RAT_Component 1929 1930 begin 1931 if not Is_Remote_Types (Name_U) then 1932 return; 1933 end if; 1934 1935 Typ := First_Entity (Name_U); 1936 while Present (Typ) and then Typ /= First_Priv_Ent loop 1937 U_Typ := Underlying_Type (Base_Type (Typ)); 1938 1939 if No (U_Typ) then 1940 U_Typ := Typ; 1941 end if; 1942 1943 if Comes_From_Source (Typ) and then Is_Type (Typ) then 1944 1945 -- Check that the type can be meaningfully transmitted to another 1946 -- partition (E.2.2(8)). 1947 1948 if (Ada_Version < Ada_2005 and then Has_Non_Remote_Access (U_Typ)) 1949 or else (Stream_Attributes_Available (Typ) 1950 and then No_External_Streaming (U_Typ)) 1951 then 1952 if Is_Non_Remote_Access_Type (Typ) then 1953 Error_Msg_N ("error in non-remote access type", U_Typ); 1954 else 1955 Error_Msg_N 1956 ("error in record type containing a component of a " & 1957 "non-remote access type", U_Typ); 1958 end if; 1959 1960 if Ada_Version >= Ada_2005 then 1961 Error_Msg_N 1962 ("\must have visible Read and Write attribute " & 1963 "definition clauses (RM E.2.2(8))", U_Typ); 1964 else 1965 Error_Msg_N 1966 ("\must have Read and Write attribute " & 1967 "definition clauses (RM E.2.2(8))", U_Typ); 1968 end if; 1969 end if; 1970 end if; 1971 1972 Next_Entity (Typ); 1973 end loop; 1974 end Validate_RT_RAT_Component; 1975 1976 ----------------------------------------- 1977 -- Validate_SP_Access_Object_Type_Decl -- 1978 ----------------------------------------- 1979 1980 procedure Validate_SP_Access_Object_Type_Decl (T : Entity_Id) is 1981 Direct_Designated_Type : Entity_Id; 1982 1983 function Has_Entry_Declarations (E : Entity_Id) return Boolean; 1984 -- Return true if the protected type designated by T has entry 1985 -- declarations. 1986 1987 ---------------------------- 1988 -- Has_Entry_Declarations -- 1989 ---------------------------- 1990 1991 function Has_Entry_Declarations (E : Entity_Id) return Boolean is 1992 Ety : Entity_Id; 1993 1994 begin 1995 if Nkind (Parent (E)) = N_Protected_Type_Declaration then 1996 Ety := First_Entity (E); 1997 while Present (Ety) loop 1998 if Ekind (Ety) = E_Entry then 1999 return True; 2000 end if; 2001 2002 Next_Entity (Ety); 2003 end loop; 2004 end if; 2005 2006 return False; 2007 end Has_Entry_Declarations; 2008 2009 -- Start of processing for Validate_SP_Access_Object_Type_Decl 2010 2011 begin 2012 -- We are called from Sem_Ch3.Analyze_Full_Type_Declaration, and the 2013 -- Nkind of the given entity is N_Access_To_Object_Definition. 2014 2015 if not Comes_From_Source (T) 2016 or else not In_Shared_Passive_Unit 2017 or else In_Subprogram_Task_Protected_Unit 2018 then 2019 return; 2020 end if; 2021 2022 -- Check Shared Passive unit. It should not contain the declaration 2023 -- of an access-to-object type whose designated type is a class-wide 2024 -- type, task type or protected type with entry (RM E.2.1(7)). 2025 2026 Direct_Designated_Type := Designated_Type (T); 2027 2028 if Ekind (Direct_Designated_Type) = E_Class_Wide_Type then 2029 Error_Msg_N 2030 ("invalid access-to-class-wide type in shared passive unit", T); 2031 return; 2032 2033 elsif Ekind (Direct_Designated_Type) in Task_Kind then 2034 Error_Msg_N 2035 ("invalid access-to-task type in shared passive unit", T); 2036 return; 2037 2038 elsif Ekind (Direct_Designated_Type) in Protected_Kind 2039 and then Has_Entry_Declarations (Direct_Designated_Type) 2040 then 2041 Error_Msg_N 2042 ("invalid access-to-protected type in shared passive unit", T); 2043 return; 2044 end if; 2045 end Validate_SP_Access_Object_Type_Decl; 2046 2047 --------------------------------- 2048 -- Validate_Static_Object_Name -- 2049 --------------------------------- 2050 2051 procedure Validate_Static_Object_Name (N : Node_Id) is 2052 E : Entity_Id; 2053 Val : Node_Id; 2054 2055 function Is_Primary (N : Node_Id) return Boolean; 2056 -- Determine whether node is syntactically a primary in an expression 2057 -- This function should probably be somewhere else ??? 2058 -- 2059 -- Also it does not do what it says, e.g if N is a binary operator 2060 -- whose parent is a binary operator, Is_Primary returns True ??? 2061 2062 ---------------- 2063 -- Is_Primary -- 2064 ---------------- 2065 2066 function Is_Primary (N : Node_Id) return Boolean is 2067 K : constant Node_Kind := Nkind (Parent (N)); 2068 2069 begin 2070 case K is 2071 when N_Op | N_Membership_Test => 2072 return True; 2073 2074 when N_Aggregate 2075 | N_Component_Association 2076 | N_Index_Or_Discriminant_Constraint => 2077 return True; 2078 2079 when N_Attribute_Reference => 2080 return Attribute_Name (Parent (N)) /= Name_Address 2081 and then Attribute_Name (Parent (N)) /= Name_Access 2082 and then Attribute_Name (Parent (N)) /= Name_Unchecked_Access 2083 and then 2084 Attribute_Name (Parent (N)) /= Name_Unrestricted_Access; 2085 2086 when N_Indexed_Component => 2087 return (N /= Prefix (Parent (N)) 2088 or else Is_Primary (Parent (N))); 2089 2090 when N_Qualified_Expression | N_Type_Conversion => 2091 return Is_Primary (Parent (N)); 2092 2093 when N_Assignment_Statement | N_Object_Declaration => 2094 return (N = Expression (Parent (N))); 2095 2096 when N_Selected_Component => 2097 return Is_Primary (Parent (N)); 2098 2099 when others => 2100 return False; 2101 end case; 2102 end Is_Primary; 2103 2104 -- Start of processing for Validate_Static_Object_Name 2105 2106 begin 2107 if not In_Preelaborated_Unit 2108 or else not Comes_From_Source (N) 2109 or else In_Subprogram_Or_Concurrent_Unit 2110 or else Ekind (Current_Scope) = E_Block 2111 then 2112 return; 2113 2114 -- Filter out cases where primary is default in a component declaration, 2115 -- discriminant specification, or actual in a record type initialization 2116 -- call. 2117 2118 -- Initialization call of internal types 2119 2120 elsif Nkind (Parent (N)) = N_Procedure_Call_Statement then 2121 2122 if Present (Parent (Parent (N))) 2123 and then Nkind (Parent (Parent (N))) = N_Freeze_Entity 2124 then 2125 return; 2126 end if; 2127 2128 if Nkind (Name (Parent (N))) = N_Identifier 2129 and then not Comes_From_Source (Entity (Name (Parent (N)))) 2130 then 2131 return; 2132 end if; 2133 end if; 2134 2135 -- Error if the name is a primary in an expression. The parent must not 2136 -- be an operator, or a selected component or an indexed component that 2137 -- is itself a primary. Entities that are actuals do not need to be 2138 -- checked, because the call itself will be diagnosed. 2139 2140 if Is_Primary (N) 2141 and then (not Inside_A_Generic 2142 or else Present (Enclosing_Generic_Body (N))) 2143 then 2144 if Ekind (Entity (N)) = E_Variable 2145 or else Ekind (Entity (N)) in Formal_Object_Kind 2146 then 2147 Flag_Non_Static_Expr 2148 ("non-static object name in preelaborated unit", N); 2149 2150 -- Give an error for a reference to a nonstatic constant, unless the 2151 -- constant is in another GNAT library unit that is preelaborable. 2152 2153 elsif Ekind (Entity (N)) = E_Constant 2154 and then not Is_Static_Expression (N) 2155 then 2156 E := Entity (N); 2157 Val := Constant_Value (E); 2158 2159 if Is_Internal_File_Name (Unit_File_Name (Get_Source_Unit (N))) 2160 and then 2161 Enclosing_Comp_Unit_Node (N) /= Enclosing_Comp_Unit_Node (E) 2162 and then (Is_Preelaborated (Scope (E)) 2163 or else Is_Pure (Scope (E)) 2164 or else (Present (Renamed_Object (E)) 2165 and then Is_Entity_Name (Renamed_Object (E)) 2166 and then 2167 (Is_Preelaborated 2168 (Scope (Renamed_Object (E))) 2169 or else 2170 Is_Pure 2171 (Scope (Renamed_Object (E)))))) 2172 then 2173 null; 2174 2175 -- If the value of the constant is a local variable that renames 2176 -- an aggregate, this is in itself legal. The aggregate may be 2177 -- expanded into a loop, but this does not affect preelaborability 2178 -- in itself. If some aggregate components are non-static, that is 2179 -- to say if they involve non static primaries, they will be 2180 -- flagged when analyzed. 2181 2182 elsif Present (Val) 2183 and then Is_Entity_Name (Val) 2184 and then Is_Array_Type (Etype (Val)) 2185 and then not Comes_From_Source (Val) 2186 and then Nkind (Original_Node (Val)) = N_Aggregate 2187 then 2188 null; 2189 2190 -- This is the error case 2191 2192 else 2193 -- In GNAT mode or Relaxed RM Semantic mode, this is just a 2194 -- warning, to allow it to be judiciously turned off. 2195 -- Otherwise it is a real error. 2196 2197 if GNAT_Mode or Relaxed_RM_Semantics then 2198 Error_Msg_N 2199 ("??non-static constant in preelaborated unit", N); 2200 else 2201 Flag_Non_Static_Expr 2202 ("non-static constant in preelaborated unit", N); 2203 end if; 2204 end if; 2205 end if; 2206 end if; 2207 end Validate_Static_Object_Name; 2208 2209end Sem_Cat; 2210