1/* Process declarations and variables for C compiler. 2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 3 2001, 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc. 4 5This file is part of GCC. 6 7GCC is free software; you can redistribute it and/or modify it under 8the terms of the GNU General Public License as published by the Free 9Software Foundation; either version 2, or (at your option) any later 10version. 11 12GCC is distributed in the hope that it will be useful, but WITHOUT ANY 13WARRANTY; without even the implied warranty of MERCHANTABILITY or 14FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 15for more details. 16 17You should have received a copy of the GNU General Public License 18along with GCC; see the file COPYING. If not, write to the Free 19Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 2002110-1301, USA. */ 21 22/* $FreeBSD$ */ 23/* Merged C99 inline changes from gcc trunk 122565 2007-03-05 */ 24/* Fixed problems with compiling inline-25.c and inline-26.c */ 25/* XXX still fails inline-29.c, inline-31.c, and inline-32.c */ 26 27/* Process declarations and symbol lookup for C front end. 28 Also constructs types; the standard scalar types at initialization, 29 and structure, union, array and enum types when they are declared. */ 30 31/* ??? not all decl nodes are given the most useful possible 32 line numbers. For example, the CONST_DECLs for enum values. */ 33 34#include "config.h" 35#include "system.h" 36#include "coretypes.h" 37#include "input.h" 38#include "tm.h" 39#include "intl.h" 40#include "tree.h" 41#include "tree-inline.h" 42#include "rtl.h" 43#include "flags.h" 44#include "function.h" 45#include "output.h" 46#include "expr.h" 47#include "c-tree.h" 48#include "toplev.h" 49#include "ggc.h" 50#include "tm_p.h" 51#include "cpplib.h" 52#include "target.h" 53#include "debug.h" 54#include "opts.h" 55#include "timevar.h" 56#include "c-common.h" 57#include "c-pragma.h" 58#include "langhooks.h" 59#include "tree-mudflap.h" 60#include "tree-gimple.h" 61#include "diagnostic.h" 62#include "tree-dump.h" 63#include "cgraph.h" 64#include "hashtab.h" 65#include "libfuncs.h" 66#include "except.h" 67#include "langhooks-def.h" 68#include "pointer-set.h" 69 70/* In grokdeclarator, distinguish syntactic contexts of declarators. */ 71enum decl_context 72{ NORMAL, /* Ordinary declaration */ 73 FUNCDEF, /* Function definition */ 74 /* APPLE LOCAL blocks 6339747 */ 75 BLOCKDEF, /* Block literal declaration */ 76 PARM, /* Declaration of parm before function body */ 77 FIELD, /* Declaration inside struct or union */ 78 TYPENAME}; /* Typename (inside cast or sizeof) */ 79 80 81/* Nonzero if we have seen an invalid cross reference 82 to a struct, union, or enum, but not yet printed the message. */ 83tree pending_invalid_xref; 84 85/* File and line to appear in the eventual error message. */ 86location_t pending_invalid_xref_location; 87 88/* True means we've initialized exception handling. */ 89bool c_eh_initialized_p; 90 91/* While defining an enum type, this is 1 plus the last enumerator 92 constant value. Note that will do not have to save this or `enum_overflow' 93 around nested function definition since such a definition could only 94 occur in an enum value expression and we don't use these variables in 95 that case. */ 96 97static tree enum_next_value; 98 99/* Nonzero means that there was overflow computing enum_next_value. */ 100 101static int enum_overflow; 102 103/* The file and line that the prototype came from if this is an 104 old-style definition; used for diagnostics in 105 store_parm_decls_oldstyle. */ 106 107static location_t current_function_prototype_locus; 108 109/* Whether this prototype was built-in. */ 110 111static bool current_function_prototype_built_in; 112 113/* The argument type information of this prototype. */ 114 115static tree current_function_prototype_arg_types; 116 117/* The argument information structure for the function currently being 118 defined. */ 119 120static struct c_arg_info *current_function_arg_info; 121 122/* The obstack on which parser and related data structures, which are 123 not live beyond their top-level declaration or definition, are 124 allocated. */ 125struct obstack parser_obstack; 126 127/* The current statement tree. */ 128 129static GTY(()) struct stmt_tree_s c_stmt_tree; 130 131/* State saving variables. */ 132tree c_break_label; 133tree c_cont_label; 134 135/* Linked list of TRANSLATION_UNIT_DECLS for the translation units 136 included in this invocation. Note that the current translation 137 unit is not included in this list. */ 138 139static GTY(()) tree all_translation_units; 140 141/* A list of decls to be made automatically visible in each file scope. */ 142static GTY(()) tree visible_builtins; 143 144/* Set to 0 at beginning of a function definition, set to 1 if 145 a return statement that specifies a return value is seen. */ 146 147int current_function_returns_value; 148 149/* Set to 0 at beginning of a function definition, set to 1 if 150 a return statement with no argument is seen. */ 151 152int current_function_returns_null; 153 154/* Set to 0 at beginning of a function definition, set to 1 if 155 a call to a noreturn function is seen. */ 156 157int current_function_returns_abnormally; 158 159/* Set to nonzero by `grokdeclarator' for a function 160 whose return type is defaulted, if warnings for this are desired. */ 161 162static int warn_about_return_type; 163 164/* Nonzero when the current toplevel function contains a declaration 165 of a nested function which is never defined. */ 166 167static bool undef_nested_function; 168 169/* True means global_bindings_p should return false even if the scope stack 170 says we are in file scope. */ 171bool c_override_global_bindings_to_false; 172 173 174/* Each c_binding structure describes one binding of an identifier to 175 a decl. All the decls in a scope - irrespective of namespace - are 176 chained together by the ->prev field, which (as the name implies) 177 runs in reverse order. All the decls in a given namespace bound to 178 a given identifier are chained by the ->shadowed field, which runs 179 from inner to outer scopes. 180 181 The ->decl field usually points to a DECL node, but there are two 182 exceptions. In the namespace of type tags, the bound entity is a 183 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared 184 identifier is encountered, it is bound to error_mark_node to 185 suppress further errors about that identifier in the current 186 function. 187 188 The ->type field stores the type of the declaration in this scope; 189 if NULL, the type is the type of the ->decl field. This is only of 190 relevance for objects with external or internal linkage which may 191 be redeclared in inner scopes, forming composite types that only 192 persist for the duration of those scopes. In the external scope, 193 this stores the composite of all the types declared for this 194 object, visible or not. The ->inner_comp field (used only at file 195 scope) stores whether an incomplete array type at file scope was 196 completed at an inner scope to an array size other than 1. 197 198 The depth field is copied from the scope structure that holds this 199 decl. It is used to preserve the proper ordering of the ->shadowed 200 field (see bind()) and also for a handful of special-case checks. 201 Finally, the invisible bit is true for a decl which should be 202 ignored for purposes of normal name lookup, and the nested bit is 203 true for a decl that's been bound a second time in an inner scope; 204 in all such cases, the binding in the outer scope will have its 205 invisible bit true. */ 206 207struct c_binding GTY((chain_next ("%h.prev"))) 208{ 209 tree decl; /* the decl bound */ 210 tree type; /* the type in this scope */ 211 tree id; /* the identifier it's bound to */ 212 struct c_binding *prev; /* the previous decl in this scope */ 213 struct c_binding *shadowed; /* the innermost decl shadowed by this one */ 214 unsigned int depth : 28; /* depth of this scope */ 215 BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */ 216 BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */ 217 BOOL_BITFIELD inner_comp : 1; /* incomplete array completed in inner scope */ 218 /* one free bit */ 219}; 220#define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth) 221#define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth) 222#define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/) 223#define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/) 224 225#define I_SYMBOL_BINDING(node) \ 226 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding) 227#define I_SYMBOL_DECL(node) \ 228 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0) 229 230#define I_TAG_BINDING(node) \ 231 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding) 232#define I_TAG_DECL(node) \ 233 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0) 234 235#define I_LABEL_BINDING(node) \ 236 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding) 237#define I_LABEL_DECL(node) \ 238 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0) 239 240/* Each C symbol points to three linked lists of c_binding structures. 241 These describe the values of the identifier in the three different 242 namespaces defined by the language. */ 243 244struct lang_identifier GTY(()) 245{ 246 struct c_common_identifier common_id; 247 struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */ 248 struct c_binding *tag_binding; /* struct/union/enum tags */ 249 struct c_binding *label_binding; /* labels */ 250}; 251 252/* Validate c-lang.c's assumptions. */ 253extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate 254[(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1]; 255 256/* The resulting tree type. */ 257 258union lang_tree_node 259 GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"), 260 chain_next ("TREE_CODE (&%h.generic) == INTEGER_TYPE ? (union lang_tree_node *) TYPE_NEXT_VARIANT (&%h.generic) : (union lang_tree_node *) TREE_CHAIN (&%h.generic)"))) 261{ 262 union tree_node GTY ((tag ("0"), 263 desc ("tree_node_structure (&%h)"))) 264 generic; 265 struct lang_identifier GTY ((tag ("1"))) identifier; 266}; 267 268/* Each c_scope structure describes the complete contents of one 269 scope. Four scopes are distinguished specially: the innermost or 270 current scope, the innermost function scope, the file scope (always 271 the second to outermost) and the outermost or external scope. 272 273 Most declarations are recorded in the current scope. 274 275 All normal label declarations are recorded in the innermost 276 function scope, as are bindings of undeclared identifiers to 277 error_mark_node. (GCC permits nested functions as an extension, 278 hence the 'innermost' qualifier.) Explicitly declared labels 279 (using the __label__ extension) appear in the current scope. 280 281 Being in the file scope (current_scope == file_scope) causes 282 special behavior in several places below. Also, under some 283 conditions the Objective-C front end records declarations in the 284 file scope even though that isn't the current scope. 285 286 All declarations with external linkage are recorded in the external 287 scope, even if they aren't visible there; this models the fact that 288 such declarations are visible to the entire program, and (with a 289 bit of cleverness, see pushdecl) allows diagnosis of some violations 290 of C99 6.2.2p7 and 6.2.7p2: 291 292 If, within the same translation unit, the same identifier appears 293 with both internal and external linkage, the behavior is 294 undefined. 295 296 All declarations that refer to the same object or function shall 297 have compatible type; otherwise, the behavior is undefined. 298 299 Initially only the built-in declarations, which describe compiler 300 intrinsic functions plus a subset of the standard library, are in 301 this scope. 302 303 The order of the blocks list matters, and it is frequently appended 304 to. To avoid having to walk all the way to the end of the list on 305 each insertion, or reverse the list later, we maintain a pointer to 306 the last list entry. (FIXME: It should be feasible to use a reversed 307 list here.) 308 309 The bindings list is strictly in reverse order of declarations; 310 pop_scope relies on this. */ 311 312 313struct c_scope GTY((chain_next ("%h.outer"))) 314{ 315 /* The scope containing this one. */ 316 struct c_scope *outer; 317 318 /* The next outermost function scope. */ 319 struct c_scope *outer_function; 320 321 /* All bindings in this scope. */ 322 struct c_binding *bindings; 323 324 /* For each scope (except the global one), a chain of BLOCK nodes 325 for all the scopes that were entered and exited one level down. */ 326 tree blocks; 327 tree blocks_last; 328 329 /* The depth of this scope. Used to keep the ->shadowed chain of 330 bindings sorted innermost to outermost. */ 331 unsigned int depth : 28; 332 333 /* True if we are currently filling this scope with parameter 334 declarations. */ 335 BOOL_BITFIELD parm_flag : 1; 336 337 /* True if we saw [*] in this scope. Used to give an error messages 338 if these appears in a function definition. */ 339 BOOL_BITFIELD had_vla_unspec : 1; 340 341 /* True if we already complained about forward parameter decls 342 in this scope. This prevents double warnings on 343 foo (int a; int b; ...) */ 344 BOOL_BITFIELD warned_forward_parm_decls : 1; 345 346 /* True if this is the outermost block scope of a function body. 347 This scope contains the parameters, the local variables declared 348 in the outermost block, and all the labels (except those in 349 nested functions, or declared at block scope with __label__). */ 350 BOOL_BITFIELD function_body : 1; 351 352 /* True means make a BLOCK for this scope no matter what. */ 353 BOOL_BITFIELD keep : 1; 354}; 355 356/* The scope currently in effect. */ 357 358static GTY(()) struct c_scope *current_scope; 359 360/* The innermost function scope. Ordinary (not explicitly declared) 361 labels, bindings to error_mark_node, and the lazily-created 362 bindings of __func__ and its friends get this scope. */ 363 364static GTY(()) struct c_scope *current_function_scope; 365 366/* The C file scope. This is reset for each input translation unit. */ 367 368static GTY(()) struct c_scope *file_scope; 369 370/* The outermost scope. This is used for all declarations with 371 external linkage, and only these, hence the name. */ 372 373static GTY(()) struct c_scope *external_scope; 374 375/* A chain of c_scope structures awaiting reuse. */ 376 377static GTY((deletable)) struct c_scope *scope_freelist; 378 379/* A chain of c_binding structures awaiting reuse. */ 380 381static GTY((deletable)) struct c_binding *binding_freelist; 382 383/* Append VAR to LIST in scope SCOPE. */ 384#define SCOPE_LIST_APPEND(scope, list, decl) do { \ 385 struct c_scope *s_ = (scope); \ 386 tree d_ = (decl); \ 387 if (s_->list##_last) \ 388 TREE_CHAIN (s_->list##_last) = d_; \ 389 else \ 390 s_->list = d_; \ 391 s_->list##_last = d_; \ 392} while (0) 393 394/* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */ 395#define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \ 396 struct c_scope *t_ = (tscope); \ 397 struct c_scope *f_ = (fscope); \ 398 if (t_->to##_last) \ 399 TREE_CHAIN (t_->to##_last) = f_->from; \ 400 else \ 401 t_->to = f_->from; \ 402 t_->to##_last = f_->from##_last; \ 403} while (0) 404 405/* True means unconditionally make a BLOCK for the next scope pushed. */ 406 407static bool keep_next_level_flag; 408 409/* True means the next call to push_scope will be the outermost scope 410 of a function body, so do not push a new scope, merely cease 411 expecting parameter decls. */ 412 413static bool next_is_function_body; 414 415/* Functions called automatically at the beginning and end of execution. */ 416 417static GTY(()) tree static_ctors; 418static GTY(()) tree static_dtors; 419 420/* Forward declarations. */ 421static tree lookup_name_in_scope (tree, struct c_scope *); 422static tree c_make_fname_decl (tree, int); 423static tree grokdeclarator (const struct c_declarator *, 424 struct c_declspecs *, 425 enum decl_context, bool, tree *); 426static tree grokparms (struct c_arg_info *, bool); 427static void layout_array_type (tree); 428 429/* T is a statement. Add it to the statement-tree. This is the 430 C/ObjC version--C++ has a slightly different version of this 431 function. */ 432 433tree 434add_stmt (tree t) 435{ 436 enum tree_code code = TREE_CODE (t); 437 438 if (EXPR_P (t) && code != LABEL_EXPR) 439 { 440 if (!EXPR_HAS_LOCATION (t)) 441 SET_EXPR_LOCATION (t, input_location); 442 } 443 444 if (code == LABEL_EXPR || code == CASE_LABEL_EXPR) 445 STATEMENT_LIST_HAS_LABEL (cur_stmt_list) = 1; 446 447 /* Add T to the statement-tree. Non-side-effect statements need to be 448 recorded during statement expressions. */ 449 append_to_statement_list_force (t, &cur_stmt_list); 450 451 return t; 452} 453 454/* States indicating how grokdeclarator() should handle declspecs marked 455 with __attribute__((deprecated)). An object declared as 456 __attribute__((deprecated)) suppresses warnings of uses of other 457 deprecated items. */ 458/* APPLE LOCAL begin "unavailable" attribute (radar 2809697) */ 459/* Also add an __attribute__((unavailable)). An object declared as 460 __attribute__((unavailable)) suppresses any reports of being 461 declared with unavailable or deprecated items. */ 462/* APPLE LOCAL end "unavailable" attribute (radar 2809697) */ 463 464enum deprecated_states { 465 DEPRECATED_NORMAL, 466 DEPRECATED_SUPPRESS 467 /* APPLE LOCAL "unavailable" attribute (radar 2809697) */ 468 , DEPRECATED_UNAVAILABLE_SUPPRESS 469}; 470 471static enum deprecated_states deprecated_state = DEPRECATED_NORMAL; 472 473void 474c_print_identifier (FILE *file, tree node, int indent) 475{ 476 print_node (file, "symbol", I_SYMBOL_DECL (node), indent + 4); 477 print_node (file, "tag", I_TAG_DECL (node), indent + 4); 478 print_node (file, "label", I_LABEL_DECL (node), indent + 4); 479 if (C_IS_RESERVED_WORD (node)) 480 { 481 tree rid = ridpointers[C_RID_CODE (node)]; 482 indent_to (file, indent + 4); 483 fprintf (file, "rid %p \"%s\"", 484 (void *) rid, IDENTIFIER_POINTER (rid)); 485 } 486} 487 488/* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL, 489 which may be any of several kinds of DECL or TYPE or error_mark_node, 490 in the scope SCOPE. */ 491static void 492bind (tree name, tree decl, struct c_scope *scope, bool invisible, bool nested) 493{ 494 struct c_binding *b, **here; 495 496 if (binding_freelist) 497 { 498 b = binding_freelist; 499 binding_freelist = b->prev; 500 } 501 else 502 b = GGC_NEW (struct c_binding); 503 504 b->shadowed = 0; 505 b->decl = decl; 506 b->id = name; 507 b->depth = scope->depth; 508 b->invisible = invisible; 509 b->nested = nested; 510 b->inner_comp = 0; 511 512 b->type = 0; 513 514 b->prev = scope->bindings; 515 scope->bindings = b; 516 517 if (!name) 518 return; 519 520 switch (TREE_CODE (decl)) 521 { 522 case LABEL_DECL: here = &I_LABEL_BINDING (name); break; 523 case ENUMERAL_TYPE: 524 case UNION_TYPE: 525 case RECORD_TYPE: here = &I_TAG_BINDING (name); break; 526 case VAR_DECL: 527 case FUNCTION_DECL: 528 case TYPE_DECL: 529 case CONST_DECL: 530 case PARM_DECL: 531 case ERROR_MARK: here = &I_SYMBOL_BINDING (name); break; 532 533 default: 534 gcc_unreachable (); 535 } 536 537 /* Locate the appropriate place in the chain of shadowed decls 538 to insert this binding. Normally, scope == current_scope and 539 this does nothing. */ 540 while (*here && (*here)->depth > scope->depth) 541 here = &(*here)->shadowed; 542 543 b->shadowed = *here; 544 *here = b; 545} 546 547/* Clear the binding structure B, stick it on the binding_freelist, 548 and return the former value of b->prev. This is used by pop_scope 549 and get_parm_info to iterate destructively over all the bindings 550 from a given scope. */ 551static struct c_binding * 552free_binding_and_advance (struct c_binding *b) 553{ 554 struct c_binding *prev = b->prev; 555 556 memset (b, 0, sizeof (struct c_binding)); 557 b->prev = binding_freelist; 558 binding_freelist = b; 559 560 return prev; 561} 562 563 564/* Hook called at end of compilation to assume 1 elt 565 for a file-scope tentative array defn that wasn't complete before. */ 566 567void 568c_finish_incomplete_decl (tree decl) 569{ 570 if (TREE_CODE (decl) == VAR_DECL) 571 { 572 tree type = TREE_TYPE (decl); 573 if (type != error_mark_node 574 && TREE_CODE (type) == ARRAY_TYPE 575 && !DECL_EXTERNAL (decl) 576 && TYPE_DOMAIN (type) == 0) 577 { 578 warning (0, "array %q+D assumed to have one element", decl); 579 580 complete_array_type (&TREE_TYPE (decl), NULL_TREE, true); 581 582 layout_decl (decl, 0); 583 } 584 } 585} 586 587/* The Objective-C front-end often needs to determine the current scope. */ 588 589void * 590objc_get_current_scope (void) 591{ 592 return current_scope; 593} 594 595/* The following function is used only by Objective-C. It needs to live here 596 because it accesses the innards of c_scope. */ 597 598void 599objc_mark_locals_volatile (void *enclosing_blk) 600{ 601 struct c_scope *scope; 602 struct c_binding *b; 603 604 for (scope = current_scope; 605 scope && scope != enclosing_blk; 606 scope = scope->outer) 607 { 608 for (b = scope->bindings; b; b = b->prev) 609 objc_volatilize_decl (b->decl); 610 611 /* Do not climb up past the current function. */ 612 if (scope->function_body) 613 break; 614 } 615} 616 617/* Nonzero if we are currently in file scope. */ 618 619int 620global_bindings_p (void) 621{ 622 return current_scope == file_scope && !c_override_global_bindings_to_false; 623} 624 625void 626keep_next_level (void) 627{ 628 keep_next_level_flag = true; 629} 630 631/* Identify this scope as currently being filled with parameters. */ 632 633void 634declare_parm_level (void) 635{ 636 current_scope->parm_flag = true; 637} 638 639void 640push_scope (void) 641{ 642 if (next_is_function_body) 643 { 644 /* This is the transition from the parameters to the top level 645 of the function body. These are the same scope 646 (C99 6.2.1p4,6) so we do not push another scope structure. 647 next_is_function_body is set only by store_parm_decls, which 648 in turn is called when and only when we are about to 649 encounter the opening curly brace for the function body. 650 651 The outermost block of a function always gets a BLOCK node, 652 because the debugging output routines expect that each 653 function has at least one BLOCK. */ 654 current_scope->parm_flag = false; 655 current_scope->function_body = true; 656 current_scope->keep = true; 657 current_scope->outer_function = current_function_scope; 658 current_function_scope = current_scope; 659 660 keep_next_level_flag = false; 661 next_is_function_body = false; 662 } 663 else 664 { 665 struct c_scope *scope; 666 if (scope_freelist) 667 { 668 scope = scope_freelist; 669 scope_freelist = scope->outer; 670 } 671 else 672 scope = GGC_CNEW (struct c_scope); 673 674 scope->keep = keep_next_level_flag; 675 scope->outer = current_scope; 676 scope->depth = current_scope ? (current_scope->depth + 1) : 0; 677 678 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but 679 possible. */ 680 if (current_scope && scope->depth == 0) 681 { 682 scope->depth--; 683 sorry ("GCC supports only %u nested scopes", scope->depth); 684 } 685 686 current_scope = scope; 687 keep_next_level_flag = false; 688 } 689} 690 691/* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */ 692 693static void 694set_type_context (tree type, tree context) 695{ 696 for (type = TYPE_MAIN_VARIANT (type); type; 697 type = TYPE_NEXT_VARIANT (type)) 698 TYPE_CONTEXT (type) = context; 699} 700 701/* Exit a scope. Restore the state of the identifier-decl mappings 702 that were in effect when this scope was entered. Return a BLOCK 703 node containing all the DECLs in this scope that are of interest 704 to debug info generation. */ 705 706tree 707pop_scope (void) 708{ 709 struct c_scope *scope = current_scope; 710 tree block, context, p; 711 struct c_binding *b; 712 713 bool functionbody = scope->function_body; 714 bool keep = functionbody || scope->keep || scope->bindings; 715 716 c_end_vm_scope (scope->depth); 717 718 /* If appropriate, create a BLOCK to record the decls for the life 719 of this function. */ 720 block = 0; 721 if (keep) 722 { 723 block = make_node (BLOCK); 724 BLOCK_SUBBLOCKS (block) = scope->blocks; 725 TREE_USED (block) = 1; 726 727 /* In each subblock, record that this is its superior. */ 728 for (p = scope->blocks; p; p = TREE_CHAIN (p)) 729 BLOCK_SUPERCONTEXT (p) = block; 730 731 BLOCK_VARS (block) = 0; 732 } 733 734 /* The TYPE_CONTEXTs for all of the tagged types belonging to this 735 scope must be set so that they point to the appropriate 736 construct, i.e. either to the current FUNCTION_DECL node, or 737 else to the BLOCK node we just constructed. 738 739 Note that for tagged types whose scope is just the formal 740 parameter list for some function type specification, we can't 741 properly set their TYPE_CONTEXTs here, because we don't have a 742 pointer to the appropriate FUNCTION_TYPE node readily available 743 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged 744 type nodes get set in `grokdeclarator' as soon as we have created 745 the FUNCTION_TYPE node which will represent the "scope" for these 746 "parameter list local" tagged types. */ 747 if (scope->function_body) 748 context = current_function_decl; 749 else if (scope == file_scope) 750 { 751 tree file_decl = build_decl (TRANSLATION_UNIT_DECL, 0, 0); 752 TREE_CHAIN (file_decl) = all_translation_units; 753 all_translation_units = file_decl; 754 context = file_decl; 755 } 756 else 757 context = block; 758 759 /* Clear all bindings in this scope. */ 760 for (b = scope->bindings; b; b = free_binding_and_advance (b)) 761 { 762 p = b->decl; 763 switch (TREE_CODE (p)) 764 { 765 case LABEL_DECL: 766 /* Warnings for unused labels, errors for undefined labels. */ 767 if (TREE_USED (p) && !DECL_INITIAL (p)) 768 { 769 error ("label %q+D used but not defined", p); 770 DECL_INITIAL (p) = error_mark_node; 771 } 772 else if (!TREE_USED (p) && warn_unused_label) 773 { 774 if (DECL_INITIAL (p)) 775 warning (0, "label %q+D defined but not used", p); 776 else 777 warning (0, "label %q+D declared but not defined", p); 778 } 779 /* Labels go in BLOCK_VARS. */ 780 TREE_CHAIN (p) = BLOCK_VARS (block); 781 BLOCK_VARS (block) = p; 782 gcc_assert (I_LABEL_BINDING (b->id) == b); 783 I_LABEL_BINDING (b->id) = b->shadowed; 784 break; 785 786 case ENUMERAL_TYPE: 787 case UNION_TYPE: 788 case RECORD_TYPE: 789 set_type_context (p, context); 790 791 /* Types may not have tag-names, in which case the type 792 appears in the bindings list with b->id NULL. */ 793 if (b->id) 794 { 795 gcc_assert (I_TAG_BINDING (b->id) == b); 796 I_TAG_BINDING (b->id) = b->shadowed; 797 } 798 break; 799 800 case FUNCTION_DECL: 801 /* Propagate TREE_ADDRESSABLE from nested functions to their 802 containing functions. */ 803 if (!TREE_ASM_WRITTEN (p) 804 && DECL_INITIAL (p) != 0 805 && TREE_ADDRESSABLE (p) 806 && DECL_ABSTRACT_ORIGIN (p) != 0 807 && DECL_ABSTRACT_ORIGIN (p) != p) 808 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1; 809 if (!DECL_EXTERNAL (p) 810 && DECL_INITIAL (p) == 0 811 && scope != file_scope 812 && scope != external_scope) 813 { 814 error ("nested function %q+D declared but never defined", p); 815 undef_nested_function = true; 816 } 817 /* C99 6.7.4p6: "a function with external linkage... declared 818 with an inline function specifier ... shall also be defined in the 819 same translation unit." */ 820 else if (DECL_DECLARED_INLINE_P (p) 821 && TREE_PUBLIC (p) 822 && !DECL_INITIAL (p) 823 && !flag_gnu89_inline) 824 pedwarn ("inline function %q+D declared but never defined", p); 825 826 goto common_symbol; 827 828 case VAR_DECL: 829 /* Warnings for unused variables. */ 830 if (!TREE_USED (p) 831 && !TREE_NO_WARNING (p) 832 && !DECL_IN_SYSTEM_HEADER (p) 833 && DECL_NAME (p) 834 && !DECL_ARTIFICIAL (p) 835 && scope != file_scope 836 && scope != external_scope) 837 warning (OPT_Wunused_variable, "unused variable %q+D", p); 838 839 if (b->inner_comp) 840 { 841 error ("type of array %q+D completed incompatibly with" 842 " implicit initialization", p); 843 } 844 845 /* Fall through. */ 846 case TYPE_DECL: 847 case CONST_DECL: 848 common_symbol: 849 /* All of these go in BLOCK_VARS, but only if this is the 850 binding in the home scope. */ 851 if (!b->nested) 852 { 853 TREE_CHAIN (p) = BLOCK_VARS (block); 854 BLOCK_VARS (block) = p; 855 } 856 /* If this is the file scope, and we are processing more 857 than one translation unit in this compilation, set 858 DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL. 859 This makes same_translation_unit_p work, and causes 860 static declarations to be given disambiguating suffixes. */ 861 if (scope == file_scope && num_in_fnames > 1) 862 { 863 DECL_CONTEXT (p) = context; 864 if (TREE_CODE (p) == TYPE_DECL) 865 set_type_context (TREE_TYPE (p), context); 866 } 867 868 /* Fall through. */ 869 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have 870 already been put there by store_parm_decls. Unused- 871 parameter warnings are handled by function.c. 872 error_mark_node obviously does not go in BLOCK_VARS and 873 does not get unused-variable warnings. */ 874 case PARM_DECL: 875 case ERROR_MARK: 876 /* It is possible for a decl not to have a name. We get 877 here with b->id NULL in this case. */ 878 if (b->id) 879 { 880 gcc_assert (I_SYMBOL_BINDING (b->id) == b); 881 I_SYMBOL_BINDING (b->id) = b->shadowed; 882 if (b->shadowed && b->shadowed->type) 883 TREE_TYPE (b->shadowed->decl) = b->shadowed->type; 884 } 885 break; 886 887 default: 888 gcc_unreachable (); 889 } 890 } 891 892 893 /* Dispose of the block that we just made inside some higher level. */ 894 if ((scope->function_body || scope == file_scope) && context) 895 { 896 DECL_INITIAL (context) = block; 897 BLOCK_SUPERCONTEXT (block) = context; 898 } 899 else if (scope->outer) 900 { 901 if (block) 902 SCOPE_LIST_APPEND (scope->outer, blocks, block); 903 /* If we did not make a block for the scope just exited, any 904 blocks made for inner scopes must be carried forward so they 905 will later become subblocks of something else. */ 906 else if (scope->blocks) 907 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks); 908 } 909 910 /* Pop the current scope, and free the structure for reuse. */ 911 current_scope = scope->outer; 912 if (scope->function_body) 913 current_function_scope = scope->outer_function; 914 915 memset (scope, 0, sizeof (struct c_scope)); 916 scope->outer = scope_freelist; 917 scope_freelist = scope; 918 919 return block; 920} 921 922void 923push_file_scope (void) 924{ 925 tree decl; 926 927 if (file_scope) 928 return; 929 930 push_scope (); 931 file_scope = current_scope; 932 933 start_fname_decls (); 934 935 for (decl = visible_builtins; decl; decl = TREE_CHAIN (decl)) 936 bind (DECL_NAME (decl), decl, file_scope, 937 /*invisible=*/false, /*nested=*/true); 938} 939 940void 941pop_file_scope (void) 942{ 943 /* In case there were missing closebraces, get us back to the global 944 binding level. */ 945 while (current_scope != file_scope) 946 pop_scope (); 947 948 /* __FUNCTION__ is defined at file scope (""). This 949 call may not be necessary as my tests indicate it 950 still works without it. */ 951 finish_fname_decls (); 952 953 /* This is the point to write out a PCH if we're doing that. 954 In that case we do not want to do anything else. */ 955 if (pch_file) 956 { 957 c_common_write_pch (); 958 return; 959 } 960 961 /* Pop off the file scope and close this translation unit. */ 962 pop_scope (); 963 file_scope = 0; 964 965 maybe_apply_pending_pragma_weaks (); 966 cgraph_finalize_compilation_unit (); 967} 968 969/* Insert BLOCK at the end of the list of subblocks of the current 970 scope. This is used when a BIND_EXPR is expanded, to handle the 971 BLOCK node inside the BIND_EXPR. */ 972 973void 974insert_block (tree block) 975{ 976 TREE_USED (block) = 1; 977 SCOPE_LIST_APPEND (current_scope, blocks, block); 978} 979 980/* Push a definition or a declaration of struct, union or enum tag "name". 981 "type" should be the type node. 982 We assume that the tag "name" is not already defined. 983 984 Note that the definition may really be just a forward reference. 985 In that case, the TYPE_SIZE will be zero. */ 986 987static void 988pushtag (tree name, tree type) 989{ 990 /* Record the identifier as the type's name if it has none. */ 991 if (name && !TYPE_NAME (type)) 992 TYPE_NAME (type) = name; 993 bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false); 994 995 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the 996 tagged type we just added to the current scope. This fake 997 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs 998 to output a representation of a tagged type, and it also gives 999 us a convenient place to record the "scope start" address for the 1000 tagged type. */ 1001 1002 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type)); 1003 1004 /* An approximation for now, so we can tell this is a function-scope tag. 1005 This will be updated in pop_scope. */ 1006 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type)); 1007} 1008 1009/* Subroutine of compare_decls. Allow harmless mismatches in return 1010 and argument types provided that the type modes match. This function 1011 return a unified type given a suitable match, and 0 otherwise. */ 1012 1013static tree 1014match_builtin_function_types (tree newtype, tree oldtype) 1015{ 1016 tree newrettype, oldrettype; 1017 tree newargs, oldargs; 1018 tree trytype, tryargs; 1019 1020 /* Accept the return type of the new declaration if same modes. */ 1021 oldrettype = TREE_TYPE (oldtype); 1022 newrettype = TREE_TYPE (newtype); 1023 1024 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype)) 1025 return 0; 1026 1027 oldargs = TYPE_ARG_TYPES (oldtype); 1028 newargs = TYPE_ARG_TYPES (newtype); 1029 tryargs = newargs; 1030 1031 while (oldargs || newargs) 1032 { 1033 if (!oldargs 1034 || !newargs 1035 || !TREE_VALUE (oldargs) 1036 || !TREE_VALUE (newargs) 1037 || TYPE_MODE (TREE_VALUE (oldargs)) 1038 != TYPE_MODE (TREE_VALUE (newargs))) 1039 return 0; 1040 1041 oldargs = TREE_CHAIN (oldargs); 1042 newargs = TREE_CHAIN (newargs); 1043 } 1044 1045 trytype = build_function_type (newrettype, tryargs); 1046 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype)); 1047} 1048 1049/* Subroutine of diagnose_mismatched_decls. Check for function type 1050 mismatch involving an empty arglist vs a nonempty one and give clearer 1051 diagnostics. */ 1052static void 1053diagnose_arglist_conflict (tree newdecl, tree olddecl, 1054 tree newtype, tree oldtype) 1055{ 1056 tree t; 1057 1058 if (TREE_CODE (olddecl) != FUNCTION_DECL 1059 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype)) 1060 || !((TYPE_ARG_TYPES (oldtype) == 0 && DECL_INITIAL (olddecl) == 0) 1061 || 1062 (TYPE_ARG_TYPES (newtype) == 0 && DECL_INITIAL (newdecl) == 0))) 1063 return; 1064 1065 t = TYPE_ARG_TYPES (oldtype); 1066 if (t == 0) 1067 t = TYPE_ARG_TYPES (newtype); 1068 for (; t; t = TREE_CHAIN (t)) 1069 { 1070 tree type = TREE_VALUE (t); 1071 1072 if (TREE_CHAIN (t) == 0 1073 && TYPE_MAIN_VARIANT (type) != void_type_node) 1074 { 1075 inform ("a parameter list with an ellipsis can%'t match " 1076 "an empty parameter name list declaration"); 1077 break; 1078 } 1079 1080 if (c_type_promotes_to (type) != type) 1081 { 1082 inform ("an argument type that has a default promotion can%'t match " 1083 "an empty parameter name list declaration"); 1084 break; 1085 } 1086 } 1087} 1088 1089/* Another subroutine of diagnose_mismatched_decls. OLDDECL is an 1090 old-style function definition, NEWDECL is a prototype declaration. 1091 Diagnose inconsistencies in the argument list. Returns TRUE if 1092 the prototype is compatible, FALSE if not. */ 1093static bool 1094validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype) 1095{ 1096 tree newargs, oldargs; 1097 int i; 1098 1099#define END_OF_ARGLIST(t) ((t) == void_type_node) 1100 1101 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype); 1102 newargs = TYPE_ARG_TYPES (newtype); 1103 i = 1; 1104 1105 for (;;) 1106 { 1107 tree oldargtype = TREE_VALUE (oldargs); 1108 tree newargtype = TREE_VALUE (newargs); 1109 1110 if (oldargtype == error_mark_node || newargtype == error_mark_node) 1111 return false; 1112 1113 oldargtype = TYPE_MAIN_VARIANT (oldargtype); 1114 newargtype = TYPE_MAIN_VARIANT (newargtype); 1115 1116 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype)) 1117 break; 1118 1119 /* Reaching the end of just one list means the two decls don't 1120 agree on the number of arguments. */ 1121 if (END_OF_ARGLIST (oldargtype)) 1122 { 1123 error ("prototype for %q+D declares more arguments " 1124 "than previous old-style definition", newdecl); 1125 return false; 1126 } 1127 else if (END_OF_ARGLIST (newargtype)) 1128 { 1129 error ("prototype for %q+D declares fewer arguments " 1130 "than previous old-style definition", newdecl); 1131 return false; 1132 } 1133 1134 /* Type for passing arg must be consistent with that declared 1135 for the arg. */ 1136 else if (!comptypes (oldargtype, newargtype)) 1137 { 1138 error ("prototype for %q+D declares argument %d" 1139 " with incompatible type", 1140 newdecl, i); 1141 return false; 1142 } 1143 1144 oldargs = TREE_CHAIN (oldargs); 1145 newargs = TREE_CHAIN (newargs); 1146 i++; 1147 } 1148 1149 /* If we get here, no errors were found, but do issue a warning 1150 for this poor-style construct. */ 1151 warning (0, "prototype for %q+D follows non-prototype definition", 1152 newdecl); 1153 return true; 1154#undef END_OF_ARGLIST 1155} 1156 1157/* Subroutine of diagnose_mismatched_decls. Report the location of DECL, 1158 first in a pair of mismatched declarations, using the diagnostic 1159 function DIAG. */ 1160static void 1161locate_old_decl (tree decl, void (*diag)(const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2)) 1162{ 1163 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl)) 1164 ; 1165 else if (DECL_INITIAL (decl)) 1166 diag (G_("previous definition of %q+D was here"), decl); 1167 else if (C_DECL_IMPLICIT (decl)) 1168 diag (G_("previous implicit declaration of %q+D was here"), decl); 1169 else 1170 diag (G_("previous declaration of %q+D was here"), decl); 1171} 1172 1173/* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL. 1174 Returns true if the caller should proceed to merge the two, false 1175 if OLDDECL should simply be discarded. As a side effect, issues 1176 all necessary diagnostics for invalid or poor-style combinations. 1177 If it returns true, writes the types of NEWDECL and OLDDECL to 1178 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from 1179 TREE_TYPE (NEWDECL, OLDDECL) respectively. */ 1180 1181static bool 1182diagnose_mismatched_decls (tree newdecl, tree olddecl, 1183 tree *newtypep, tree *oldtypep) 1184{ 1185 tree newtype, oldtype; 1186 bool pedwarned = false; 1187 bool warned = false; 1188 bool retval = true; 1189 1190#define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \ 1191 && DECL_EXTERNAL (DECL)) 1192 1193 /* If we have error_mark_node for either decl or type, just discard 1194 the previous decl - we're in an error cascade already. */ 1195 if (olddecl == error_mark_node || newdecl == error_mark_node) 1196 return false; 1197 *oldtypep = oldtype = TREE_TYPE (olddecl); 1198 *newtypep = newtype = TREE_TYPE (newdecl); 1199 if (oldtype == error_mark_node || newtype == error_mark_node) 1200 return false; 1201 1202 /* Two different categories of symbol altogether. This is an error 1203 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */ 1204 if (TREE_CODE (olddecl) != TREE_CODE (newdecl)) 1205 { 1206 if (!(TREE_CODE (olddecl) == FUNCTION_DECL 1207 && DECL_BUILT_IN (olddecl) 1208 && !C_DECL_DECLARED_BUILTIN (olddecl))) 1209 { 1210 error ("%q+D redeclared as different kind of symbol", newdecl); 1211 locate_old_decl (olddecl, error); 1212 } 1213 else if (TREE_PUBLIC (newdecl)) 1214 warning (0, "built-in function %q+D declared as non-function", 1215 newdecl); 1216 else 1217 warning (OPT_Wshadow, "declaration of %q+D shadows " 1218 "a built-in function", newdecl); 1219 return false; 1220 } 1221 1222 /* Enumerators have no linkage, so may only be declared once in a 1223 given scope. */ 1224 if (TREE_CODE (olddecl) == CONST_DECL) 1225 { 1226 error ("redeclaration of enumerator %q+D", newdecl); 1227 locate_old_decl (olddecl, error); 1228 return false; 1229 } 1230 1231 if (!comptypes (oldtype, newtype)) 1232 { 1233 if (TREE_CODE (olddecl) == FUNCTION_DECL 1234 && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl)) 1235 { 1236 /* Accept harmless mismatch in function types. 1237 This is for the ffs and fprintf builtins. */ 1238 tree trytype = match_builtin_function_types (newtype, oldtype); 1239 1240 if (trytype && comptypes (newtype, trytype)) 1241 *oldtypep = oldtype = trytype; 1242 else 1243 { 1244 /* If types don't match for a built-in, throw away the 1245 built-in. No point in calling locate_old_decl here, it 1246 won't print anything. */ 1247 warning (0, "conflicting types for built-in function %q+D", 1248 newdecl); 1249 return false; 1250 } 1251 } 1252 else if (TREE_CODE (olddecl) == FUNCTION_DECL 1253 && DECL_IS_BUILTIN (olddecl)) 1254 { 1255 /* A conflicting function declaration for a predeclared 1256 function that isn't actually built in. Objective C uses 1257 these. The new declaration silently overrides everything 1258 but the volatility (i.e. noreturn) indication. See also 1259 below. FIXME: Make Objective C use normal builtins. */ 1260 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl); 1261 return false; 1262 } 1263 /* Permit void foo (...) to match int foo (...) if the latter is 1264 the definition and implicit int was used. See 1265 c-torture/compile/920625-2.c. */ 1266 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) 1267 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node 1268 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node 1269 && C_FUNCTION_IMPLICIT_INT (newdecl) && !DECL_INITIAL (olddecl)) 1270 { 1271 pedwarn ("conflicting types for %q+D", newdecl); 1272 /* Make sure we keep void as the return type. */ 1273 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype; 1274 C_FUNCTION_IMPLICIT_INT (newdecl) = 0; 1275 pedwarned = true; 1276 } 1277 /* Permit void foo (...) to match an earlier call to foo (...) with 1278 no declared type (thus, implicitly int). */ 1279 else if (TREE_CODE (newdecl) == FUNCTION_DECL 1280 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == void_type_node 1281 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == integer_type_node 1282 && C_DECL_IMPLICIT (olddecl) && !DECL_INITIAL (olddecl)) 1283 { 1284 pedwarn ("conflicting types for %q+D", newdecl); 1285 /* Make sure we keep void as the return type. */ 1286 TREE_TYPE (olddecl) = *oldtypep = oldtype = newtype; 1287 pedwarned = true; 1288 } 1289 else 1290 { 1291 if (TYPE_QUALS (newtype) != TYPE_QUALS (oldtype)) 1292 error ("conflicting type qualifiers for %q+D", newdecl); 1293 else 1294 error ("conflicting types for %q+D", newdecl); 1295 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype); 1296 locate_old_decl (olddecl, error); 1297 return false; 1298 } 1299 } 1300 1301 /* Redeclaration of a type is a constraint violation (6.7.2.3p1), 1302 but silently ignore the redeclaration if either is in a system 1303 header. (Conflicting redeclarations were handled above.) */ 1304 if (TREE_CODE (newdecl) == TYPE_DECL) 1305 { 1306 if (DECL_IN_SYSTEM_HEADER (newdecl) || DECL_IN_SYSTEM_HEADER (olddecl)) 1307 return true; /* Allow OLDDECL to continue in use. */ 1308 1309 error ("redefinition of typedef %q+D", newdecl); 1310 locate_old_decl (olddecl, error); 1311 return false; 1312 } 1313 1314 /* Function declarations can either be 'static' or 'extern' (no 1315 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore 1316 can never conflict with each other on account of linkage 1317 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but 1318 gnu89 mode permits two definitions if one is 'extern inline' and 1319 one is not. The non- extern-inline definition supersedes the 1320 extern-inline definition. */ 1321 1322 else if (TREE_CODE (newdecl) == FUNCTION_DECL) 1323 { 1324 /* If you declare a built-in function name as static, or 1325 define the built-in with an old-style definition (so we 1326 can't validate the argument list) the built-in definition is 1327 overridden, but optionally warn this was a bad choice of name. */ 1328 if (DECL_BUILT_IN (olddecl) 1329 && !C_DECL_DECLARED_BUILTIN (olddecl) 1330 && (!TREE_PUBLIC (newdecl) 1331 || (DECL_INITIAL (newdecl) 1332 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl))))) 1333 { 1334 warning (OPT_Wshadow, "declaration of %q+D shadows " 1335 "a built-in function", newdecl); 1336 /* Discard the old built-in function. */ 1337 return false; 1338 } 1339 1340 if (DECL_INITIAL (newdecl)) 1341 { 1342 if (DECL_INITIAL (olddecl)) 1343 { 1344 /* If both decls are in the same TU and the new declaration 1345 isn't overriding an extern inline reject the new decl. 1346 In c99, no overriding is allowed in the same translation 1347 unit. */ 1348 if ((!DECL_EXTERN_INLINE (olddecl) 1349 || DECL_EXTERN_INLINE (newdecl) 1350 || (!flag_gnu89_inline 1351 && (!DECL_DECLARED_INLINE_P (olddecl) 1352 || !lookup_attribute ("gnu_inline", 1353 DECL_ATTRIBUTES (olddecl))) 1354 && (!DECL_DECLARED_INLINE_P (newdecl) 1355 || !lookup_attribute ("gnu_inline", 1356 DECL_ATTRIBUTES (newdecl)))) 1357 ) 1358 && same_translation_unit_p (newdecl, olddecl)) 1359 { 1360 error ("redefinition of %q+D", newdecl); 1361 locate_old_decl (olddecl, error); 1362 return false; 1363 } 1364 } 1365 } 1366 /* If we have a prototype after an old-style function definition, 1367 the argument types must be checked specially. */ 1368 else if (DECL_INITIAL (olddecl) 1369 && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype) 1370 && TYPE_ACTUAL_ARG_TYPES (oldtype) 1371 && !validate_proto_after_old_defn (newdecl, newtype, oldtype)) 1372 { 1373 locate_old_decl (olddecl, error); 1374 return false; 1375 } 1376 /* A non-static declaration (even an "extern") followed by a 1377 static declaration is undefined behavior per C99 6.2.2p3-5,7. 1378 The same is true for a static forward declaration at block 1379 scope followed by a non-static declaration/definition at file 1380 scope. Static followed by non-static at the same scope is 1381 not undefined behavior, and is the most convenient way to get 1382 some effects (see e.g. what unwind-dw2-fde-glibc.c does to 1383 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but 1384 we do diagnose it if -Wtraditional. */ 1385 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl)) 1386 { 1387 /* Two exceptions to the rule. If olddecl is an extern 1388 inline, or a predeclared function that isn't actually 1389 built in, newdecl silently overrides olddecl. The latter 1390 occur only in Objective C; see also above. (FIXME: Make 1391 Objective C use normal builtins.) */ 1392 if (!DECL_IS_BUILTIN (olddecl) 1393 && !DECL_EXTERN_INLINE (olddecl)) 1394 { 1395 error ("static declaration of %q+D follows " 1396 "non-static declaration", newdecl); 1397 locate_old_decl (olddecl, error); 1398 } 1399 return false; 1400 } 1401 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl)) 1402 { 1403 if (DECL_CONTEXT (olddecl)) 1404 { 1405 error ("non-static declaration of %q+D follows " 1406 "static declaration", newdecl); 1407 locate_old_decl (olddecl, error); 1408 return false; 1409 } 1410 else if (warn_traditional) 1411 { 1412 warning (OPT_Wtraditional, "non-static declaration of %q+D " 1413 "follows static declaration", newdecl); 1414 warned = true; 1415 } 1416 } 1417 1418 /* Make sure gnu_inline attribute is either not present, or 1419 present on all inline decls. */ 1420 if (DECL_DECLARED_INLINE_P (olddecl) 1421 && DECL_DECLARED_INLINE_P (newdecl)) 1422 { 1423 bool newa = lookup_attribute ("gnu_inline", 1424 DECL_ATTRIBUTES (newdecl)) != NULL; 1425 bool olda = lookup_attribute ("gnu_inline", 1426 DECL_ATTRIBUTES (olddecl)) != NULL; 1427 if (newa != olda) 1428 { 1429 error ("%<gnu_inline%> attribute present on %q+D", 1430 newa ? newdecl : olddecl); 1431 error ("%Jbut not here", newa ? olddecl : newdecl); 1432 } 1433 } 1434 } 1435 else if (TREE_CODE (newdecl) == VAR_DECL) 1436 { 1437 /* Only variables can be thread-local, and all declarations must 1438 agree on this property. */ 1439 if (C_DECL_THREADPRIVATE_P (olddecl) && !DECL_THREAD_LOCAL_P (newdecl)) 1440 { 1441 /* Nothing to check. Since OLDDECL is marked threadprivate 1442 and NEWDECL does not have a thread-local attribute, we 1443 will merge the threadprivate attribute into NEWDECL. */ 1444 ; 1445 } 1446 else if (DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl)) 1447 { 1448 if (DECL_THREAD_LOCAL_P (newdecl)) 1449 error ("thread-local declaration of %q+D follows " 1450 "non-thread-local declaration", newdecl); 1451 else 1452 error ("non-thread-local declaration of %q+D follows " 1453 "thread-local declaration", newdecl); 1454 1455 locate_old_decl (olddecl, error); 1456 return false; 1457 } 1458 1459 /* Multiple initialized definitions are not allowed (6.9p3,5). */ 1460 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl)) 1461 { 1462 error ("redefinition of %q+D", newdecl); 1463 locate_old_decl (olddecl, error); 1464 return false; 1465 } 1466 1467 /* Objects declared at file scope: if the first declaration had 1468 external linkage (even if it was an external reference) the 1469 second must have external linkage as well, or the behavior is 1470 undefined. If the first declaration had internal linkage, then 1471 the second must too, or else be an external reference (in which 1472 case the composite declaration still has internal linkage). 1473 As for function declarations, we warn about the static-then- 1474 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */ 1475 if (DECL_FILE_SCOPE_P (newdecl) 1476 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl)) 1477 { 1478 if (DECL_EXTERNAL (newdecl)) 1479 { 1480 if (!DECL_FILE_SCOPE_P (olddecl)) 1481 { 1482 error ("extern declaration of %q+D follows " 1483 "declaration with no linkage", newdecl); 1484 locate_old_decl (olddecl, error); 1485 return false; 1486 } 1487 else if (warn_traditional) 1488 { 1489 warning (OPT_Wtraditional, "non-static declaration of %q+D " 1490 "follows static declaration", newdecl); 1491 warned = true; 1492 } 1493 } 1494 else 1495 { 1496 if (TREE_PUBLIC (newdecl)) 1497 error ("non-static declaration of %q+D follows " 1498 "static declaration", newdecl); 1499 else 1500 error ("static declaration of %q+D follows " 1501 "non-static declaration", newdecl); 1502 1503 locate_old_decl (olddecl, error); 1504 return false; 1505 } 1506 } 1507 /* Two objects with the same name declared at the same block 1508 scope must both be external references (6.7p3). */ 1509 else if (!DECL_FILE_SCOPE_P (newdecl)) 1510 { 1511 if (DECL_EXTERNAL (newdecl)) 1512 { 1513 /* Extern with initializer at block scope, which will 1514 already have received an error. */ 1515 } 1516 else if (DECL_EXTERNAL (olddecl)) 1517 { 1518 error ("declaration of %q+D with no linkage follows " 1519 "extern declaration", newdecl); 1520 locate_old_decl (olddecl, error); 1521 } 1522 else 1523 { 1524 error ("redeclaration of %q+D with no linkage", newdecl); 1525 locate_old_decl (olddecl, error); 1526 } 1527 1528 return false; 1529 } 1530 } 1531 1532 /* warnings */ 1533 /* All decls must agree on a visibility. */ 1534 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl), TS_DECL_WITH_VIS) 1535 && DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl) 1536 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl)) 1537 { 1538 warning (0, "redeclaration of %q+D with different visibility " 1539 "(old visibility preserved)", newdecl); 1540 warned = true; 1541 } 1542 1543 if (TREE_CODE (newdecl) == FUNCTION_DECL) 1544 { 1545 /* Diagnose inline __attribute__ ((noinline)) which is silly. */ 1546 if (DECL_DECLARED_INLINE_P (newdecl) 1547 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl))) 1548 { 1549 warning (OPT_Wattributes, "inline declaration of %qD follows " 1550 "declaration with attribute noinline", newdecl); 1551 warned = true; 1552 } 1553 else if (DECL_DECLARED_INLINE_P (olddecl) 1554 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl))) 1555 { 1556 warning (OPT_Wattributes, "declaration of %q+D with attribute " 1557 "noinline follows inline declaration ", newdecl); 1558 warned = true; 1559 } 1560 1561 /* Inline declaration after use or definition. 1562 ??? Should we still warn about this now we have unit-at-a-time 1563 mode and can get it right? 1564 Definitely don't complain if the decls are in different translation 1565 units. 1566 C99 permits this, so don't warn in that case. (The function 1567 may not be inlined everywhere in function-at-a-time mode, but 1568 we still shouldn't warn.) */ 1569 if (DECL_DECLARED_INLINE_P (newdecl) && !DECL_DECLARED_INLINE_P (olddecl) 1570 && same_translation_unit_p (olddecl, newdecl) 1571 && flag_gnu89_inline) 1572 { 1573 if (TREE_USED (olddecl)) 1574 { 1575 warning (0, "%q+D declared inline after being called", olddecl); 1576 warned = true; 1577 } 1578 else if (DECL_INITIAL (olddecl)) 1579 { 1580 warning (0, "%q+D declared inline after its definition", olddecl); 1581 warned = true; 1582 } 1583 } 1584 } 1585 else /* PARM_DECL, VAR_DECL */ 1586 { 1587 /* Redeclaration of a parameter is a constraint violation (this is 1588 not explicitly stated, but follows from C99 6.7p3 [no more than 1589 one declaration of the same identifier with no linkage in the 1590 same scope, except type tags] and 6.2.2p6 [parameters have no 1591 linkage]). We must check for a forward parameter declaration, 1592 indicated by TREE_ASM_WRITTEN on the old declaration - this is 1593 an extension, the mandatory diagnostic for which is handled by 1594 mark_forward_parm_decls. */ 1595 1596 if (TREE_CODE (newdecl) == PARM_DECL 1597 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl))) 1598 { 1599 error ("redefinition of parameter %q+D", newdecl); 1600 locate_old_decl (olddecl, error); 1601 return false; 1602 } 1603 } 1604 1605 /* Optional warning for completely redundant decls. */ 1606 if (!warned && !pedwarned 1607 && warn_redundant_decls 1608 /* Don't warn about a function declaration followed by a 1609 definition. */ 1610 && !(TREE_CODE (newdecl) == FUNCTION_DECL 1611 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl)) 1612 /* Don't warn about redundant redeclarations of builtins. */ 1613 && !(TREE_CODE (newdecl) == FUNCTION_DECL 1614 && !DECL_BUILT_IN (newdecl) 1615 && DECL_BUILT_IN (olddecl) 1616 && !C_DECL_DECLARED_BUILTIN (olddecl)) 1617 /* Don't warn about an extern followed by a definition. */ 1618 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl)) 1619 /* Don't warn about forward parameter decls. */ 1620 && !(TREE_CODE (newdecl) == PARM_DECL 1621 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl)) 1622 /* Don't warn about a variable definition following a declaration. */ 1623 && !(TREE_CODE (newdecl) == VAR_DECL 1624 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))) 1625 { 1626 warning (OPT_Wredundant_decls, "redundant redeclaration of %q+D", 1627 newdecl); 1628 warned = true; 1629 } 1630 1631 /* Report location of previous decl/defn in a consistent manner. */ 1632 if (warned || pedwarned) 1633 locate_old_decl (olddecl, pedwarned ? pedwarn : warning0); 1634 1635#undef DECL_EXTERN_INLINE 1636 1637 return retval; 1638} 1639 1640/* Subroutine of duplicate_decls. NEWDECL has been found to be 1641 consistent with OLDDECL, but carries new information. Merge the 1642 new information into OLDDECL. This function issues no 1643 diagnostics. */ 1644 1645static void 1646merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype) 1647{ 1648 bool new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL 1649 && DECL_INITIAL (newdecl) != 0); 1650 bool new_is_prototype = (TREE_CODE (newdecl) == FUNCTION_DECL 1651 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0); 1652 bool old_is_prototype = (TREE_CODE (olddecl) == FUNCTION_DECL 1653 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) != 0); 1654 bool extern_changed = false; 1655 1656 /* For real parm decl following a forward decl, rechain the old decl 1657 in its new location and clear TREE_ASM_WRITTEN (it's not a 1658 forward decl anymore). */ 1659 if (TREE_CODE (newdecl) == PARM_DECL 1660 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl)) 1661 { 1662 struct c_binding *b, **here; 1663 1664 for (here = ¤t_scope->bindings; *here; here = &(*here)->prev) 1665 if ((*here)->decl == olddecl) 1666 goto found; 1667 gcc_unreachable (); 1668 1669 found: 1670 b = *here; 1671 *here = b->prev; 1672 b->prev = current_scope->bindings; 1673 current_scope->bindings = b; 1674 1675 TREE_ASM_WRITTEN (olddecl) = 0; 1676 } 1677 1678 DECL_ATTRIBUTES (newdecl) 1679 = targetm.merge_decl_attributes (olddecl, newdecl); 1680 1681 /* Merge the data types specified in the two decls. */ 1682 TREE_TYPE (newdecl) 1683 = TREE_TYPE (olddecl) 1684 = composite_type (newtype, oldtype); 1685 1686 /* Lay the type out, unless already done. */ 1687 if (!comptypes (oldtype, TREE_TYPE (newdecl))) 1688 { 1689 if (TREE_TYPE (newdecl) != error_mark_node) 1690 layout_type (TREE_TYPE (newdecl)); 1691 if (TREE_CODE (newdecl) != FUNCTION_DECL 1692 && TREE_CODE (newdecl) != TYPE_DECL 1693 && TREE_CODE (newdecl) != CONST_DECL) 1694 layout_decl (newdecl, 0); 1695 } 1696 else 1697 { 1698 /* Since the type is OLDDECL's, make OLDDECL's size go with. */ 1699 DECL_SIZE (newdecl) = DECL_SIZE (olddecl); 1700 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl); 1701 DECL_MODE (newdecl) = DECL_MODE (olddecl); 1702 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl)) 1703 { 1704 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl); 1705 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl); 1706 } 1707 } 1708 1709 1710 /* Merge the type qualifiers. */ 1711 if (TREE_READONLY (newdecl)) 1712 TREE_READONLY (olddecl) = 1; 1713 1714 if (TREE_THIS_VOLATILE (newdecl)) 1715 TREE_THIS_VOLATILE (olddecl) = 1; 1716 1717 /* Merge deprecatedness. */ 1718 if (TREE_DEPRECATED (newdecl)) 1719 TREE_DEPRECATED (olddecl) = 1; 1720 1721 /* APPLE LOCAL begin "unavailable" attribute (radar 2809697) */ 1722 /* Merge unavailableness. */ 1723 if (TREE_UNAVAILABLE (newdecl)) 1724 TREE_UNAVAILABLE (olddecl) = 1; 1725 /* APPLE LOCAL end "unavailable" attribute (radar 2809697) */ 1726 1727 /* Keep source location of definition rather than declaration and of 1728 prototype rather than non-prototype unless that prototype is 1729 built-in. */ 1730 if ((DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0) 1731 || (old_is_prototype && !new_is_prototype 1732 && !C_DECL_BUILTIN_PROTOTYPE (olddecl))) 1733 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl); 1734 1735 /* Merge the initialization information. */ 1736 if (DECL_INITIAL (newdecl) == 0) 1737 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl); 1738 1739 /* Merge the threadprivate attribute. */ 1740 if (TREE_CODE (olddecl) == VAR_DECL && C_DECL_THREADPRIVATE_P (olddecl)) 1741 { 1742 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl); 1743 C_DECL_THREADPRIVATE_P (newdecl) = 1; 1744 } 1745 1746 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS)) 1747 { 1748 /* Merge the unused-warning information. */ 1749 if (DECL_IN_SYSTEM_HEADER (olddecl)) 1750 DECL_IN_SYSTEM_HEADER (newdecl) = 1; 1751 else if (DECL_IN_SYSTEM_HEADER (newdecl)) 1752 DECL_IN_SYSTEM_HEADER (olddecl) = 1; 1753 1754 /* Merge the section attribute. 1755 We want to issue an error if the sections conflict but that 1756 must be done later in decl_attributes since we are called 1757 before attributes are assigned. */ 1758 if (DECL_SECTION_NAME (newdecl) == NULL_TREE) 1759 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl); 1760 1761 /* Copy the assembler name. 1762 Currently, it can only be defined in the prototype. */ 1763 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl); 1764 1765 /* Use visibility of whichever declaration had it specified */ 1766 if (DECL_VISIBILITY_SPECIFIED (olddecl)) 1767 { 1768 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl); 1769 DECL_VISIBILITY_SPECIFIED (newdecl) = 1; 1770 } 1771 1772 if (TREE_CODE (newdecl) == FUNCTION_DECL) 1773 { 1774 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl); 1775 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl); 1776 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl); 1777 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl) 1778 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl); 1779 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl); 1780 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl); 1781 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl); 1782 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl); 1783 DECL_IS_NOVOPS (newdecl) |= DECL_IS_NOVOPS (olddecl); 1784 } 1785 1786 /* Merge the storage class information. */ 1787 merge_weak (newdecl, olddecl); 1788 1789 /* For functions, static overrides non-static. */ 1790 if (TREE_CODE (newdecl) == FUNCTION_DECL) 1791 { 1792 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl); 1793 /* This is since we don't automatically 1794 copy the attributes of NEWDECL into OLDDECL. */ 1795 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl); 1796 /* If this clears `static', clear it in the identifier too. */ 1797 if (!TREE_PUBLIC (olddecl)) 1798 TREE_PUBLIC (DECL_NAME (olddecl)) = 0; 1799 } 1800 } 1801 1802 /* In c99, 'extern' declaration before (or after) 'inline' means this 1803 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute 1804 is present. */ 1805 if (TREE_CODE (newdecl) == FUNCTION_DECL 1806 && !flag_gnu89_inline 1807 && (DECL_DECLARED_INLINE_P (newdecl) 1808 || DECL_DECLARED_INLINE_P (olddecl)) 1809 && (!DECL_DECLARED_INLINE_P (newdecl) 1810 || !DECL_DECLARED_INLINE_P (olddecl) 1811 || !DECL_EXTERNAL (olddecl)) 1812 && DECL_EXTERNAL (newdecl) 1813 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl))) 1814 DECL_EXTERNAL (newdecl) = 0; 1815 1816 if (DECL_EXTERNAL (newdecl)) 1817 { 1818 TREE_STATIC (newdecl) = TREE_STATIC (olddecl); 1819 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl); 1820 1821 /* An extern decl does not override previous storage class. */ 1822 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl); 1823 if (!DECL_EXTERNAL (newdecl)) 1824 { 1825 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl); 1826 DECL_COMMON (newdecl) = DECL_COMMON (olddecl); 1827 } 1828 } 1829 else 1830 { 1831 TREE_STATIC (olddecl) = TREE_STATIC (newdecl); 1832 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl); 1833 } 1834 1835 if (TREE_CODE (newdecl) == FUNCTION_DECL) 1836 { 1837 /* If we're redefining a function previously defined as extern 1838 inline, make sure we emit debug info for the inline before we 1839 throw it away, in case it was inlined into a function that 1840 hasn't been written out yet. */ 1841 if (new_is_definition && DECL_INITIAL (olddecl)) 1842 { 1843 if (TREE_USED (olddecl) 1844 /* In unit-at-a-time mode we never inline re-defined extern 1845 inline functions. */ 1846 && !flag_unit_at_a_time 1847 && cgraph_function_possibly_inlined_p (olddecl)) 1848 (*debug_hooks->outlining_inline_function) (olddecl); 1849 1850 /* The new defn must not be inline. */ 1851 DECL_INLINE (newdecl) = 0; 1852 DECL_UNINLINABLE (newdecl) = 1; 1853 } 1854 else 1855 { 1856 /* If either decl says `inline', this fn is inline, unless 1857 its definition was passed already. */ 1858 if (DECL_DECLARED_INLINE_P (newdecl) 1859 || DECL_DECLARED_INLINE_P (olddecl)) 1860 DECL_DECLARED_INLINE_P (newdecl) = 1; 1861 1862 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl) 1863 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)); 1864 } 1865 1866 if (DECL_BUILT_IN (olddecl)) 1867 { 1868 /* If redeclaring a builtin function, it stays built in. 1869 But it gets tagged as having been declared. */ 1870 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl); 1871 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl); 1872 C_DECL_DECLARED_BUILTIN (newdecl) = 1; 1873 if (new_is_prototype) 1874 C_DECL_BUILTIN_PROTOTYPE (newdecl) = 0; 1875 else 1876 C_DECL_BUILTIN_PROTOTYPE (newdecl) 1877 = C_DECL_BUILTIN_PROTOTYPE (olddecl); 1878 } 1879 1880 /* Also preserve various other info from the definition. */ 1881 if (!new_is_definition) 1882 { 1883 DECL_RESULT (newdecl) = DECL_RESULT (olddecl); 1884 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl); 1885 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl); 1886 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl); 1887 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl); 1888 1889 /* Set DECL_INLINE on the declaration if we've got a body 1890 from which to instantiate. */ 1891 if (DECL_INLINE (olddecl) && !DECL_UNINLINABLE (newdecl)) 1892 { 1893 DECL_INLINE (newdecl) = 1; 1894 DECL_ABSTRACT_ORIGIN (newdecl) 1895 = DECL_ABSTRACT_ORIGIN (olddecl); 1896 } 1897 } 1898 else 1899 { 1900 /* If a previous declaration said inline, mark the 1901 definition as inlinable. */ 1902 if (DECL_DECLARED_INLINE_P (newdecl) 1903 && !DECL_UNINLINABLE (newdecl)) 1904 DECL_INLINE (newdecl) = 1; 1905 } 1906 } 1907 1908 extern_changed = DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl); 1909 1910 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL. 1911 But preserve OLDDECL's DECL_UID and DECL_CONTEXT. */ 1912 { 1913 unsigned olddecl_uid = DECL_UID (olddecl); 1914 tree olddecl_context = DECL_CONTEXT (olddecl); 1915 1916 memcpy ((char *) olddecl + sizeof (struct tree_common), 1917 (char *) newdecl + sizeof (struct tree_common), 1918 sizeof (struct tree_decl_common) - sizeof (struct tree_common)); 1919 switch (TREE_CODE (olddecl)) 1920 { 1921 case FIELD_DECL: 1922 case VAR_DECL: 1923 case PARM_DECL: 1924 case LABEL_DECL: 1925 case RESULT_DECL: 1926 case CONST_DECL: 1927 case TYPE_DECL: 1928 case FUNCTION_DECL: 1929 memcpy ((char *) olddecl + sizeof (struct tree_decl_common), 1930 (char *) newdecl + sizeof (struct tree_decl_common), 1931 tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common)); 1932 break; 1933 1934 default: 1935 1936 memcpy ((char *) olddecl + sizeof (struct tree_decl_common), 1937 (char *) newdecl + sizeof (struct tree_decl_common), 1938 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common)); 1939 } 1940 DECL_UID (olddecl) = olddecl_uid; 1941 DECL_CONTEXT (olddecl) = olddecl_context; 1942 } 1943 1944 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl 1945 so that encode_section_info has a chance to look at the new decl 1946 flags and attributes. */ 1947 if (DECL_RTL_SET_P (olddecl) 1948 && (TREE_CODE (olddecl) == FUNCTION_DECL 1949 || (TREE_CODE (olddecl) == VAR_DECL 1950 && TREE_STATIC (olddecl)))) 1951 make_decl_rtl (olddecl); 1952 1953 /* If we changed a function from DECL_EXTERNAL to !DECL_EXTERNAL, 1954 and the definition is coming from the old version, cgraph needs 1955 to be called again. */ 1956 if (extern_changed && !new_is_definition 1957 && TREE_CODE (olddecl) == FUNCTION_DECL && DECL_INITIAL (olddecl)) 1958 cgraph_finalize_function (olddecl, false); 1959} 1960 1961/* Handle when a new declaration NEWDECL has the same name as an old 1962 one OLDDECL in the same binding contour. Prints an error message 1963 if appropriate. 1964 1965 If safely possible, alter OLDDECL to look like NEWDECL, and return 1966 true. Otherwise, return false. */ 1967 1968static bool 1969duplicate_decls (tree newdecl, tree olddecl) 1970{ 1971 tree newtype = NULL, oldtype = NULL; 1972 1973 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype)) 1974 { 1975 /* Avoid `unused variable' and other warnings warnings for OLDDECL. */ 1976 TREE_NO_WARNING (olddecl) = 1; 1977 return false; 1978 } 1979 1980 merge_decls (newdecl, olddecl, newtype, oldtype); 1981 return true; 1982} 1983 1984 1985/* Check whether decl-node NEW_DECL shadows an existing declaration. */ 1986static void 1987warn_if_shadowing (tree new_decl) 1988{ 1989 struct c_binding *b; 1990 1991 /* Shadow warnings wanted? */ 1992 if (!warn_shadow 1993 /* No shadow warnings for internally generated vars. */ 1994 || DECL_IS_BUILTIN (new_decl) 1995 /* No shadow warnings for vars made for inlining. */ 1996 || DECL_FROM_INLINE (new_decl)) 1997 return; 1998 1999 /* Is anything being shadowed? Invisible decls do not count. */ 2000 for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed) 2001 if (b->decl && b->decl != new_decl && !b->invisible) 2002 { 2003 tree old_decl = b->decl; 2004 2005 if (old_decl == error_mark_node) 2006 { 2007 warning (OPT_Wshadow, "declaration of %q+D shadows previous " 2008 "non-variable", new_decl); 2009 break; 2010 } 2011 else if (TREE_CODE (old_decl) == PARM_DECL) 2012 warning (OPT_Wshadow, "declaration of %q+D shadows a parameter", 2013 new_decl); 2014 else if (DECL_FILE_SCOPE_P (old_decl)) 2015 warning (OPT_Wshadow, "declaration of %q+D shadows a global " 2016 "declaration", new_decl); 2017 else if (TREE_CODE (old_decl) == FUNCTION_DECL 2018 && DECL_BUILT_IN (old_decl)) 2019 { 2020 warning (OPT_Wshadow, "declaration of %q+D shadows " 2021 "a built-in function", new_decl); 2022 break; 2023 } 2024 else 2025 warning (OPT_Wshadow, "declaration of %q+D shadows a previous local", 2026 new_decl); 2027 2028 warning (OPT_Wshadow, "%Jshadowed declaration is here", old_decl); 2029 2030 break; 2031 } 2032} 2033 2034 2035/* Subroutine of pushdecl. 2036 2037 X is a TYPE_DECL for a typedef statement. Create a brand new 2038 ..._TYPE node (which will be just a variant of the existing 2039 ..._TYPE node with identical properties) and then install X 2040 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node. 2041 2042 The whole point here is to end up with a situation where each 2043 and every ..._TYPE node the compiler creates will be uniquely 2044 associated with AT MOST one node representing a typedef name. 2045 This way, even though the compiler substitutes corresponding 2046 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very 2047 early on, later parts of the compiler can always do the reverse 2048 translation and get back the corresponding typedef name. For 2049 example, given: 2050 2051 typedef struct S MY_TYPE; 2052 MY_TYPE object; 2053 2054 Later parts of the compiler might only know that `object' was of 2055 type `struct S' if it were not for code just below. With this 2056 code however, later parts of the compiler see something like: 2057 2058 struct S' == struct S 2059 typedef struct S' MY_TYPE; 2060 struct S' object; 2061 2062 And they can then deduce (from the node for type struct S') that 2063 the original object declaration was: 2064 2065 MY_TYPE object; 2066 2067 Being able to do this is important for proper support of protoize, 2068 and also for generating precise symbolic debugging information 2069 which takes full account of the programmer's (typedef) vocabulary. 2070 2071 Obviously, we don't want to generate a duplicate ..._TYPE node if 2072 the TYPE_DECL node that we are now processing really represents a 2073 standard built-in type. 2074 2075 Since all standard types are effectively declared at line zero 2076 in the source file, we can easily check to see if we are working 2077 on a standard type by checking the current value of lineno. */ 2078 2079static void 2080clone_underlying_type (tree x) 2081{ 2082 if (DECL_IS_BUILTIN (x)) 2083 { 2084 if (TYPE_NAME (TREE_TYPE (x)) == 0) 2085 TYPE_NAME (TREE_TYPE (x)) = x; 2086 } 2087 else if (TREE_TYPE (x) != error_mark_node 2088 && DECL_ORIGINAL_TYPE (x) == NULL_TREE) 2089 { 2090 tree tt = TREE_TYPE (x); 2091 DECL_ORIGINAL_TYPE (x) = tt; 2092 tt = build_variant_type_copy (tt); 2093 TYPE_NAME (tt) = x; 2094 TREE_USED (tt) = TREE_USED (x); 2095 TREE_TYPE (x) = tt; 2096 } 2097} 2098 2099/* Record a decl-node X as belonging to the current lexical scope. 2100 Check for errors (such as an incompatible declaration for the same 2101 name already seen in the same scope). 2102 2103 Returns either X or an old decl for the same name. 2104 If an old decl is returned, it may have been smashed 2105 to agree with what X says. */ 2106 2107tree 2108pushdecl (tree x) 2109{ 2110 tree name = DECL_NAME (x); 2111 struct c_scope *scope = current_scope; 2112 struct c_binding *b; 2113 bool nested = false; 2114 2115 /* Functions need the lang_decl data. */ 2116 if (TREE_CODE (x) == FUNCTION_DECL && !DECL_LANG_SPECIFIC (x)) 2117 DECL_LANG_SPECIFIC (x) = GGC_CNEW (struct lang_decl); 2118 2119 /* Must set DECL_CONTEXT for everything not at file scope or 2120 DECL_FILE_SCOPE_P won't work. Local externs don't count 2121 unless they have initializers (which generate code). */ 2122 if (current_function_decl 2123 && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL) 2124 || DECL_INITIAL (x) || !DECL_EXTERNAL (x))) 2125 DECL_CONTEXT (x) = current_function_decl; 2126 2127 /* If this is of variably modified type, prevent jumping into its 2128 scope. */ 2129 if ((TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == TYPE_DECL) 2130 && variably_modified_type_p (TREE_TYPE (x), NULL_TREE)) 2131 c_begin_vm_scope (scope->depth); 2132 2133 /* Anonymous decls are just inserted in the scope. */ 2134 if (!name) 2135 { 2136 bind (name, x, scope, /*invisible=*/false, /*nested=*/false); 2137 return x; 2138 } 2139 2140 /* First, see if there is another declaration with the same name in 2141 the current scope. If there is, duplicate_decls may do all the 2142 work for us. If duplicate_decls returns false, that indicates 2143 two incompatible decls in the same scope; we are to silently 2144 replace the old one (duplicate_decls has issued all appropriate 2145 diagnostics). In particular, we should not consider possible 2146 duplicates in the external scope, or shadowing. */ 2147 b = I_SYMBOL_BINDING (name); 2148 if (b && B_IN_SCOPE (b, scope)) 2149 { 2150 struct c_binding *b_ext, *b_use; 2151 tree type = TREE_TYPE (x); 2152 tree visdecl = b->decl; 2153 tree vistype = TREE_TYPE (visdecl); 2154 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE 2155 && COMPLETE_TYPE_P (TREE_TYPE (x))) 2156 b->inner_comp = false; 2157 b_use = b; 2158 b_ext = b; 2159 /* If this is an external linkage declaration, we should check 2160 for compatibility with the type in the external scope before 2161 setting the type at this scope based on the visible 2162 information only. */ 2163 if (TREE_PUBLIC (x) && TREE_PUBLIC (visdecl)) 2164 { 2165 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext)) 2166 b_ext = b_ext->shadowed; 2167 if (b_ext) 2168 { 2169 b_use = b_ext; 2170 if (b_use->type) 2171 TREE_TYPE (b_use->decl) = b_use->type; 2172 } 2173 } 2174 if (duplicate_decls (x, b_use->decl)) 2175 { 2176 if (b_use != b) 2177 { 2178 /* Save the updated type in the external scope and 2179 restore the proper type for this scope. */ 2180 tree thistype; 2181 if (comptypes (vistype, type)) 2182 thistype = composite_type (vistype, type); 2183 else 2184 thistype = TREE_TYPE (b_use->decl); 2185 b_use->type = TREE_TYPE (b_use->decl); 2186 if (TREE_CODE (b_use->decl) == FUNCTION_DECL 2187 && DECL_BUILT_IN (b_use->decl)) 2188 thistype 2189 = build_type_attribute_variant (thistype, 2190 TYPE_ATTRIBUTES 2191 (b_use->type)); 2192 TREE_TYPE (b_use->decl) = thistype; 2193 } 2194 return b_use->decl; 2195 } 2196 else 2197 goto skip_external_and_shadow_checks; 2198 } 2199 2200 /* All declarations with external linkage, and all external 2201 references, go in the external scope, no matter what scope is 2202 current. However, the binding in that scope is ignored for 2203 purposes of normal name lookup. A separate binding structure is 2204 created in the requested scope; this governs the normal 2205 visibility of the symbol. 2206 2207 The binding in the externals scope is used exclusively for 2208 detecting duplicate declarations of the same object, no matter 2209 what scope they are in; this is what we do here. (C99 6.2.7p2: 2210 All declarations that refer to the same object or function shall 2211 have compatible type; otherwise, the behavior is undefined.) */ 2212 if (DECL_EXTERNAL (x) || scope == file_scope) 2213 { 2214 tree type = TREE_TYPE (x); 2215 tree vistype = 0; 2216 tree visdecl = 0; 2217 bool type_saved = false; 2218 if (b && !B_IN_EXTERNAL_SCOPE (b) 2219 && (TREE_CODE (b->decl) == FUNCTION_DECL 2220 || TREE_CODE (b->decl) == VAR_DECL) 2221 && DECL_FILE_SCOPE_P (b->decl)) 2222 { 2223 visdecl = b->decl; 2224 vistype = TREE_TYPE (visdecl); 2225 } 2226 if (scope != file_scope 2227 && !DECL_IN_SYSTEM_HEADER (x)) 2228 warning (OPT_Wnested_externs, "nested extern declaration of %qD", x); 2229 2230 while (b && !B_IN_EXTERNAL_SCOPE (b)) 2231 { 2232 /* If this decl might be modified, save its type. This is 2233 done here rather than when the decl is first bound 2234 because the type may change after first binding, through 2235 being completed or through attributes being added. If we 2236 encounter multiple such decls, only the first should have 2237 its type saved; the others will already have had their 2238 proper types saved and the types will not have changed as 2239 their scopes will not have been re-entered. */ 2240 if (DECL_P (b->decl) && DECL_FILE_SCOPE_P (b->decl) && !type_saved) 2241 { 2242 b->type = TREE_TYPE (b->decl); 2243 type_saved = true; 2244 } 2245 if (B_IN_FILE_SCOPE (b) 2246 && TREE_CODE (b->decl) == VAR_DECL 2247 && TREE_STATIC (b->decl) 2248 && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE 2249 && !TYPE_DOMAIN (TREE_TYPE (b->decl)) 2250 && TREE_CODE (type) == ARRAY_TYPE 2251 && TYPE_DOMAIN (type) 2252 && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) 2253 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type)))) 2254 { 2255 /* Array type completed in inner scope, which should be 2256 diagnosed if the completion does not have size 1 and 2257 it does not get completed in the file scope. */ 2258 b->inner_comp = true; 2259 } 2260 b = b->shadowed; 2261 } 2262 2263 /* If a matching external declaration has been found, set its 2264 type to the composite of all the types of that declaration. 2265 After the consistency checks, it will be reset to the 2266 composite of the visible types only. */ 2267 if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl)) 2268 && b->type) 2269 TREE_TYPE (b->decl) = b->type; 2270 2271 /* The point of the same_translation_unit_p check here is, 2272 we want to detect a duplicate decl for a construct like 2273 foo() { extern bar(); } ... static bar(); but not if 2274 they are in different translation units. In any case, 2275 the static does not go in the externals scope. */ 2276 if (b 2277 && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl)) 2278 && duplicate_decls (x, b->decl)) 2279 { 2280 tree thistype; 2281 if (vistype) 2282 { 2283 if (comptypes (vistype, type)) 2284 thistype = composite_type (vistype, type); 2285 else 2286 thistype = TREE_TYPE (b->decl); 2287 } 2288 else 2289 thistype = type; 2290 b->type = TREE_TYPE (b->decl); 2291 if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl)) 2292 thistype 2293 = build_type_attribute_variant (thistype, 2294 TYPE_ATTRIBUTES (b->type)); 2295 TREE_TYPE (b->decl) = thistype; 2296 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true); 2297 return b->decl; 2298 } 2299 else if (TREE_PUBLIC (x)) 2300 { 2301 if (visdecl && !b && duplicate_decls (x, visdecl)) 2302 { 2303 /* An external declaration at block scope referring to a 2304 visible entity with internal linkage. The composite 2305 type will already be correct for this scope, so we 2306 just need to fall through to make the declaration in 2307 this scope. */ 2308 nested = true; 2309 x = visdecl; 2310 } 2311 else 2312 { 2313 bind (name, x, external_scope, /*invisible=*/true, 2314 /*nested=*/false); 2315 nested = true; 2316 } 2317 } 2318 } 2319 2320 if (TREE_CODE (x) != PARM_DECL) 2321 warn_if_shadowing (x); 2322 2323 skip_external_and_shadow_checks: 2324 if (TREE_CODE (x) == TYPE_DECL) 2325 clone_underlying_type (x); 2326 2327 bind (name, x, scope, /*invisible=*/false, nested); 2328 2329 /* If x's type is incomplete because it's based on a 2330 structure or union which has not yet been fully declared, 2331 attach it to that structure or union type, so we can go 2332 back and complete the variable declaration later, if the 2333 structure or union gets fully declared. 2334 2335 If the input is erroneous, we can have error_mark in the type 2336 slot (e.g. "f(void a, ...)") - that doesn't count as an 2337 incomplete type. */ 2338 if (TREE_TYPE (x) != error_mark_node 2339 && !COMPLETE_TYPE_P (TREE_TYPE (x))) 2340 { 2341 tree element = TREE_TYPE (x); 2342 2343 while (TREE_CODE (element) == ARRAY_TYPE) 2344 element = TREE_TYPE (element); 2345 element = TYPE_MAIN_VARIANT (element); 2346 2347 if ((TREE_CODE (element) == RECORD_TYPE 2348 || TREE_CODE (element) == UNION_TYPE) 2349 && (TREE_CODE (x) != TYPE_DECL 2350 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE) 2351 && !COMPLETE_TYPE_P (element)) 2352 C_TYPE_INCOMPLETE_VARS (element) 2353 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element)); 2354 } 2355 return x; 2356} 2357 2358/* Record X as belonging to file scope. 2359 This is used only internally by the Objective-C front end, 2360 and is limited to its needs. duplicate_decls is not called; 2361 if there is any preexisting decl for this identifier, it is an ICE. */ 2362 2363tree 2364pushdecl_top_level (tree x) 2365{ 2366 tree name; 2367 bool nested = false; 2368 gcc_assert (TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == CONST_DECL); 2369 2370 name = DECL_NAME (x); 2371 2372 gcc_assert (TREE_CODE (x) == CONST_DECL || !I_SYMBOL_BINDING (name)); 2373 2374 if (TREE_PUBLIC (x)) 2375 { 2376 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false); 2377 nested = true; 2378 } 2379 if (file_scope) 2380 bind (name, x, file_scope, /*invisible=*/false, nested); 2381 2382 return x; 2383} 2384 2385static void 2386implicit_decl_warning (tree id, tree olddecl) 2387{ 2388 void (*diag) (const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2); 2389 switch (mesg_implicit_function_declaration) 2390 { 2391 case 0: return; 2392 case 1: diag = warning0; break; 2393 case 2: diag = error; break; 2394 default: gcc_unreachable (); 2395 } 2396 2397 diag (G_("implicit declaration of function %qE"), id); 2398 if (olddecl) 2399 locate_old_decl (olddecl, diag); 2400} 2401 2402/* Generate an implicit declaration for identifier FUNCTIONID as a 2403 function of type int (). */ 2404 2405tree 2406implicitly_declare (tree functionid) 2407{ 2408 struct c_binding *b; 2409 tree decl = 0; 2410 tree asmspec_tree; 2411 2412 for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed) 2413 { 2414 if (B_IN_SCOPE (b, external_scope)) 2415 { 2416 decl = b->decl; 2417 break; 2418 } 2419 } 2420 2421 if (decl) 2422 { 2423 if (decl == error_mark_node) 2424 return decl; 2425 2426 /* FIXME: Objective-C has weird not-really-builtin functions 2427 which are supposed to be visible automatically. They wind up 2428 in the external scope because they're pushed before the file 2429 scope gets created. Catch this here and rebind them into the 2430 file scope. */ 2431 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl)) 2432 { 2433 bind (functionid, decl, file_scope, 2434 /*invisible=*/false, /*nested=*/true); 2435 return decl; 2436 } 2437 else 2438 { 2439 tree newtype = default_function_type; 2440 if (b->type) 2441 TREE_TYPE (decl) = b->type; 2442 /* Implicit declaration of a function already declared 2443 (somehow) in a different scope, or as a built-in. 2444 If this is the first time this has happened, warn; 2445 then recycle the old declaration but with the new type. */ 2446 if (!C_DECL_IMPLICIT (decl)) 2447 { 2448 implicit_decl_warning (functionid, decl); 2449 C_DECL_IMPLICIT (decl) = 1; 2450 } 2451 if (DECL_BUILT_IN (decl)) 2452 { 2453 newtype = build_type_attribute_variant (newtype, 2454 TYPE_ATTRIBUTES 2455 (TREE_TYPE (decl))); 2456 if (!comptypes (newtype, TREE_TYPE (decl))) 2457 { 2458 warning (0, "incompatible implicit declaration of built-in" 2459 " function %qD", decl); 2460 newtype = TREE_TYPE (decl); 2461 } 2462 } 2463 else 2464 { 2465 if (!comptypes (newtype, TREE_TYPE (decl))) 2466 { 2467 error ("incompatible implicit declaration of function %qD", 2468 decl); 2469 locate_old_decl (decl, error); 2470 } 2471 } 2472 b->type = TREE_TYPE (decl); 2473 TREE_TYPE (decl) = newtype; 2474 bind (functionid, decl, current_scope, 2475 /*invisible=*/false, /*nested=*/true); 2476 return decl; 2477 } 2478 } 2479 2480 /* Not seen before. */ 2481 decl = build_decl (FUNCTION_DECL, functionid, default_function_type); 2482 DECL_EXTERNAL (decl) = 1; 2483 TREE_PUBLIC (decl) = 1; 2484 C_DECL_IMPLICIT (decl) = 1; 2485 implicit_decl_warning (functionid, 0); 2486 asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL); 2487 if (asmspec_tree) 2488 set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree)); 2489 2490 /* C89 says implicit declarations are in the innermost block. 2491 So we record the decl in the standard fashion. */ 2492 decl = pushdecl (decl); 2493 2494 /* No need to call objc_check_decl here - it's a function type. */ 2495 rest_of_decl_compilation (decl, 0, 0); 2496 2497 /* Write a record describing this implicit function declaration 2498 to the prototypes file (if requested). */ 2499 gen_aux_info_record (decl, 0, 1, 0); 2500 2501 /* Possibly apply some default attributes to this implicit declaration. */ 2502 decl_attributes (&decl, NULL_TREE, 0); 2503 2504 return decl; 2505} 2506 2507/* Issue an error message for a reference to an undeclared variable 2508 ID, including a reference to a builtin outside of function-call 2509 context. Establish a binding of the identifier to error_mark_node 2510 in an appropriate scope, which will suppress further errors for the 2511 same identifier. The error message should be given location LOC. */ 2512void 2513undeclared_variable (tree id, location_t loc) 2514{ 2515 static bool already = false; 2516 struct c_scope *scope; 2517 2518 if (current_function_decl == 0) 2519 { 2520 error ("%H%qE undeclared here (not in a function)", &loc, id); 2521 scope = current_scope; 2522 } 2523 else 2524 { 2525 error ("%H%qE undeclared (first use in this function)", &loc, id); 2526 2527 if (!already) 2528 { 2529 error ("%H(Each undeclared identifier is reported only once", &loc); 2530 error ("%Hfor each function it appears in.)", &loc); 2531 already = true; 2532 } 2533 2534 /* If we are parsing old-style parameter decls, current_function_decl 2535 will be nonnull but current_function_scope will be null. */ 2536 scope = current_function_scope ? current_function_scope : current_scope; 2537 } 2538 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false); 2539} 2540 2541/* Subroutine of lookup_label, declare_label, define_label: construct a 2542 LABEL_DECL with all the proper frills. */ 2543 2544static tree 2545make_label (tree name, location_t location) 2546{ 2547 tree label = build_decl (LABEL_DECL, name, void_type_node); 2548 2549 DECL_CONTEXT (label) = current_function_decl; 2550 DECL_MODE (label) = VOIDmode; 2551 DECL_SOURCE_LOCATION (label) = location; 2552 2553 return label; 2554} 2555 2556/* Get the LABEL_DECL corresponding to identifier NAME as a label. 2557 Create one if none exists so far for the current function. 2558 This is called when a label is used in a goto expression or 2559 has its address taken. */ 2560 2561tree 2562lookup_label (tree name) 2563{ 2564 tree label; 2565 2566 if (current_function_decl == 0) 2567 { 2568 error ("label %qE referenced outside of any function", name); 2569 return 0; 2570 } 2571 2572 /* Use a label already defined or ref'd with this name, but not if 2573 it is inherited from a containing function and wasn't declared 2574 using __label__. */ 2575 label = I_LABEL_DECL (name); 2576 if (label && (DECL_CONTEXT (label) == current_function_decl 2577 || C_DECLARED_LABEL_FLAG (label))) 2578 { 2579 /* If the label has only been declared, update its apparent 2580 location to point here, for better diagnostics if it 2581 turns out not to have been defined. */ 2582 if (!TREE_USED (label)) 2583 DECL_SOURCE_LOCATION (label) = input_location; 2584 return label; 2585 } 2586 2587 /* No label binding for that identifier; make one. */ 2588 label = make_label (name, input_location); 2589 2590 /* Ordinary labels go in the current function scope. */ 2591 bind (name, label, current_function_scope, 2592 /*invisible=*/false, /*nested=*/false); 2593 return label; 2594} 2595 2596/* Make a label named NAME in the current function, shadowing silently 2597 any that may be inherited from containing functions or containing 2598 scopes. This is called for __label__ declarations. */ 2599 2600tree 2601declare_label (tree name) 2602{ 2603 struct c_binding *b = I_LABEL_BINDING (name); 2604 tree label; 2605 2606 /* Check to make sure that the label hasn't already been declared 2607 at this scope */ 2608 if (b && B_IN_CURRENT_SCOPE (b)) 2609 { 2610 error ("duplicate label declaration %qE", name); 2611 locate_old_decl (b->decl, error); 2612 2613 /* Just use the previous declaration. */ 2614 return b->decl; 2615 } 2616 2617 label = make_label (name, input_location); 2618 C_DECLARED_LABEL_FLAG (label) = 1; 2619 2620 /* Declared labels go in the current scope. */ 2621 bind (name, label, current_scope, 2622 /*invisible=*/false, /*nested=*/false); 2623 return label; 2624} 2625 2626/* Define a label, specifying the location in the source file. 2627 Return the LABEL_DECL node for the label, if the definition is valid. 2628 Otherwise return 0. */ 2629 2630tree 2631define_label (location_t location, tree name) 2632{ 2633 /* Find any preexisting label with this name. It is an error 2634 if that label has already been defined in this function, or 2635 if there is a containing function with a declared label with 2636 the same name. */ 2637 tree label = I_LABEL_DECL (name); 2638 struct c_label_list *nlist_se, *nlist_vm; 2639 2640 if (label 2641 && ((DECL_CONTEXT (label) == current_function_decl 2642 && DECL_INITIAL (label) != 0) 2643 || (DECL_CONTEXT (label) != current_function_decl 2644 && C_DECLARED_LABEL_FLAG (label)))) 2645 { 2646 error ("%Hduplicate label %qD", &location, label); 2647 locate_old_decl (label, error); 2648 return 0; 2649 } 2650 else if (label && DECL_CONTEXT (label) == current_function_decl) 2651 { 2652 /* The label has been used or declared already in this function, 2653 but not defined. Update its location to point to this 2654 definition. */ 2655 if (C_DECL_UNDEFINABLE_STMT_EXPR (label)) 2656 error ("%Jjump into statement expression", label); 2657 if (C_DECL_UNDEFINABLE_VM (label)) 2658 error ("%Jjump into scope of identifier with variably modified type", 2659 label); 2660 DECL_SOURCE_LOCATION (label) = location; 2661 } 2662 else 2663 { 2664 /* No label binding for that identifier; make one. */ 2665 label = make_label (name, location); 2666 2667 /* Ordinary labels go in the current function scope. */ 2668 bind (name, label, current_function_scope, 2669 /*invisible=*/false, /*nested=*/false); 2670 } 2671 2672 if (!in_system_header && lookup_name (name)) 2673 warning (OPT_Wtraditional, "%Htraditional C lacks a separate namespace " 2674 "for labels, identifier %qE conflicts", &location, name); 2675 2676 nlist_se = XOBNEW (&parser_obstack, struct c_label_list); 2677 nlist_se->next = label_context_stack_se->labels_def; 2678 nlist_se->label = label; 2679 label_context_stack_se->labels_def = nlist_se; 2680 2681 nlist_vm = XOBNEW (&parser_obstack, struct c_label_list); 2682 nlist_vm->next = label_context_stack_vm->labels_def; 2683 nlist_vm->label = label; 2684 label_context_stack_vm->labels_def = nlist_vm; 2685 2686 /* Mark label as having been defined. */ 2687 DECL_INITIAL (label) = error_mark_node; 2688 return label; 2689} 2690 2691/* Given NAME, an IDENTIFIER_NODE, 2692 return the structure (or union or enum) definition for that name. 2693 If THISLEVEL_ONLY is nonzero, searches only the current_scope. 2694 CODE says which kind of type the caller wants; 2695 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE. 2696 If the wrong kind of type is found, an error is reported. */ 2697 2698static tree 2699lookup_tag (enum tree_code code, tree name, int thislevel_only) 2700{ 2701 struct c_binding *b = I_TAG_BINDING (name); 2702 int thislevel = 0; 2703 2704 if (!b || !b->decl) 2705 return 0; 2706 2707 /* We only care about whether it's in this level if 2708 thislevel_only was set or it might be a type clash. */ 2709 if (thislevel_only || TREE_CODE (b->decl) != code) 2710 { 2711 /* For our purposes, a tag in the external scope is the same as 2712 a tag in the file scope. (Primarily relevant to Objective-C 2713 and its builtin structure tags, which get pushed before the 2714 file scope is created.) */ 2715 if (B_IN_CURRENT_SCOPE (b) 2716 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b))) 2717 thislevel = 1; 2718 } 2719 2720 if (thislevel_only && !thislevel) 2721 return 0; 2722 2723 if (TREE_CODE (b->decl) != code) 2724 { 2725 /* Definition isn't the kind we were looking for. */ 2726 pending_invalid_xref = name; 2727 pending_invalid_xref_location = input_location; 2728 2729 /* If in the same binding level as a declaration as a tag 2730 of a different type, this must not be allowed to 2731 shadow that tag, so give the error immediately. 2732 (For example, "struct foo; union foo;" is invalid.) */ 2733 if (thislevel) 2734 pending_xref_error (); 2735 } 2736 return b->decl; 2737} 2738 2739/* Print an error message now 2740 for a recent invalid struct, union or enum cross reference. 2741 We don't print them immediately because they are not invalid 2742 when used in the `struct foo;' construct for shadowing. */ 2743 2744void 2745pending_xref_error (void) 2746{ 2747 if (pending_invalid_xref != 0) 2748 error ("%H%qE defined as wrong kind of tag", 2749 &pending_invalid_xref_location, pending_invalid_xref); 2750 pending_invalid_xref = 0; 2751} 2752 2753 2754/* Look up NAME in the current scope and its superiors 2755 in the namespace of variables, functions and typedefs. 2756 Return a ..._DECL node of some kind representing its definition, 2757 or return 0 if it is undefined. */ 2758 2759tree 2760lookup_name (tree name) 2761{ 2762 struct c_binding *b = I_SYMBOL_BINDING (name); 2763 if (b && !b->invisible) 2764 return b->decl; 2765 return 0; 2766} 2767 2768/* Similar to `lookup_name' but look only at the indicated scope. */ 2769 2770static tree 2771lookup_name_in_scope (tree name, struct c_scope *scope) 2772{ 2773 struct c_binding *b; 2774 2775 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed) 2776 if (B_IN_SCOPE (b, scope)) 2777 return b->decl; 2778 return 0; 2779} 2780 2781/* Create the predefined scalar types of C, 2782 and some nodes representing standard constants (0, 1, (void *) 0). 2783 Initialize the global scope. 2784 Make definitions for built-in primitive functions. */ 2785 2786void 2787c_init_decl_processing (void) 2788{ 2789 location_t save_loc = input_location; 2790 2791 /* Initialize reserved words for parser. */ 2792 c_parse_init (); 2793 2794 current_function_decl = 0; 2795 2796 gcc_obstack_init (&parser_obstack); 2797 2798 /* Make the externals scope. */ 2799 push_scope (); 2800 external_scope = current_scope; 2801 2802 /* Declarations from c_common_nodes_and_builtins must not be associated 2803 with this input file, lest we get differences between using and not 2804 using preprocessed headers. */ 2805#ifdef USE_MAPPED_LOCATION 2806 input_location = BUILTINS_LOCATION; 2807#else 2808 input_location.file = "<built-in>"; 2809 input_location.line = 0; 2810#endif 2811 2812 build_common_tree_nodes (flag_signed_char, false); 2813 2814 c_common_nodes_and_builtins (); 2815 2816 /* In C, comparisons and TRUTH_* expressions have type int. */ 2817 truthvalue_type_node = integer_type_node; 2818 truthvalue_true_node = integer_one_node; 2819 truthvalue_false_node = integer_zero_node; 2820 2821 /* Even in C99, which has a real boolean type. */ 2822 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"), 2823 boolean_type_node)); 2824 2825 input_location = save_loc; 2826 2827 pedantic_lvalues = true; 2828 2829 make_fname_decl = c_make_fname_decl; 2830 start_fname_decls (); 2831} 2832 2833/* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the 2834 decl, NAME is the initialization string and TYPE_DEP indicates whether 2835 NAME depended on the type of the function. As we don't yet implement 2836 delayed emission of static data, we mark the decl as emitted 2837 so it is not placed in the output. Anything using it must therefore pull 2838 out the STRING_CST initializer directly. FIXME. */ 2839 2840static tree 2841c_make_fname_decl (tree id, int type_dep) 2842{ 2843 const char *name = fname_as_string (type_dep); 2844 tree decl, type, init; 2845 size_t length = strlen (name); 2846 2847 type = build_array_type (char_type_node, 2848 build_index_type (size_int (length))); 2849 type = c_build_qualified_type (type, TYPE_QUAL_CONST); 2850 2851 decl = build_decl (VAR_DECL, id, type); 2852 2853 TREE_STATIC (decl) = 1; 2854 TREE_READONLY (decl) = 1; 2855 DECL_ARTIFICIAL (decl) = 1; 2856 2857 init = build_string (length + 1, name); 2858 free ((char *) name); 2859 TREE_TYPE (init) = type; 2860 DECL_INITIAL (decl) = init; 2861 2862 TREE_USED (decl) = 1; 2863 2864 if (current_function_decl 2865 /* For invalid programs like this: 2866 2867 void foo() 2868 const char* p = __FUNCTION__; 2869 2870 the __FUNCTION__ is believed to appear in K&R style function 2871 parameter declarator. In that case we still don't have 2872 function_scope. */ 2873 && (!errorcount || current_function_scope)) 2874 { 2875 DECL_CONTEXT (decl) = current_function_decl; 2876 bind (id, decl, current_function_scope, 2877 /*invisible=*/false, /*nested=*/false); 2878 } 2879 2880 finish_decl (decl, init, NULL_TREE); 2881 2882 return decl; 2883} 2884 2885/* Return a definition for a builtin function named NAME and whose data type 2886 is TYPE. TYPE should be a function type with argument types. 2887 FUNCTION_CODE tells later passes how to compile calls to this function. 2888 See tree.h for its possible values. 2889 2890 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME, 2891 the name to be called if we can't opencode the function. If 2892 ATTRS is nonzero, use that for the function's attribute list. */ 2893 2894tree 2895builtin_function (const char *name, tree type, int function_code, 2896 enum built_in_class cl, const char *library_name, 2897 tree attrs) 2898{ 2899 tree id = get_identifier (name); 2900 tree decl = build_decl (FUNCTION_DECL, id, type); 2901 TREE_PUBLIC (decl) = 1; 2902 DECL_EXTERNAL (decl) = 1; 2903 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl); 2904 DECL_BUILT_IN_CLASS (decl) = cl; 2905 DECL_FUNCTION_CODE (decl) = function_code; 2906 C_DECL_BUILTIN_PROTOTYPE (decl) = (TYPE_ARG_TYPES (type) != 0); 2907 if (library_name) 2908 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name)); 2909 2910 /* Should never be called on a symbol with a preexisting meaning. */ 2911 gcc_assert (!I_SYMBOL_BINDING (id)); 2912 2913 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false); 2914 2915 /* Builtins in the implementation namespace are made visible without 2916 needing to be explicitly declared. See push_file_scope. */ 2917 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1]))) 2918 { 2919 TREE_CHAIN (decl) = visible_builtins; 2920 visible_builtins = decl; 2921 } 2922 2923 /* Possibly apply some default attributes to this built-in function. */ 2924 if (attrs) 2925 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN); 2926 else 2927 decl_attributes (&decl, NULL_TREE, 0); 2928 2929 return decl; 2930} 2931 2932/* Called when a declaration is seen that contains no names to declare. 2933 If its type is a reference to a structure, union or enum inherited 2934 from a containing scope, shadow that tag name for the current scope 2935 with a forward reference. 2936 If its type defines a new named structure or union 2937 or defines an enum, it is valid but we need not do anything here. 2938 Otherwise, it is an error. */ 2939 2940void 2941shadow_tag (const struct c_declspecs *declspecs) 2942{ 2943 shadow_tag_warned (declspecs, 0); 2944} 2945 2946/* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning, 2947 but no pedwarn. */ 2948void 2949shadow_tag_warned (const struct c_declspecs *declspecs, int warned) 2950{ 2951 bool found_tag = false; 2952 2953 if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p) 2954 { 2955 tree value = declspecs->type; 2956 enum tree_code code = TREE_CODE (value); 2957 2958 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE) 2959 /* Used to test also that TYPE_SIZE (value) != 0. 2960 That caused warning for `struct foo;' at top level in the file. */ 2961 { 2962 tree name = TYPE_NAME (value); 2963 tree t; 2964 2965 found_tag = true; 2966 2967 if (name == 0) 2968 { 2969 if (warned != 1 && code != ENUMERAL_TYPE) 2970 /* Empty unnamed enum OK */ 2971 { 2972 pedwarn ("unnamed struct/union that defines no instances"); 2973 warned = 1; 2974 } 2975 } 2976 else if (!declspecs->tag_defined_p 2977 && declspecs->storage_class != csc_none) 2978 { 2979 if (warned != 1) 2980 pedwarn ("empty declaration with storage class specifier " 2981 "does not redeclare tag"); 2982 warned = 1; 2983 pending_xref_error (); 2984 } 2985 else if (!declspecs->tag_defined_p 2986 && (declspecs->const_p 2987 || declspecs->volatile_p 2988 || declspecs->restrict_p)) 2989 { 2990 if (warned != 1) 2991 pedwarn ("empty declaration with type qualifier " 2992 "does not redeclare tag"); 2993 warned = 1; 2994 pending_xref_error (); 2995 } 2996 else 2997 { 2998 pending_invalid_xref = 0; 2999 t = lookup_tag (code, name, 1); 3000 3001 if (t == 0) 3002 { 3003 t = make_node (code); 3004 pushtag (name, t); 3005 } 3006 } 3007 } 3008 else 3009 { 3010 if (warned != 1 && !in_system_header) 3011 { 3012 pedwarn ("useless type name in empty declaration"); 3013 warned = 1; 3014 } 3015 } 3016 } 3017 else if (warned != 1 && !in_system_header && declspecs->typedef_p) 3018 { 3019 pedwarn ("useless type name in empty declaration"); 3020 warned = 1; 3021 } 3022 3023 pending_invalid_xref = 0; 3024 3025 if (declspecs->inline_p) 3026 { 3027 error ("%<inline%> in empty declaration"); 3028 warned = 1; 3029 } 3030 3031 if (current_scope == file_scope && declspecs->storage_class == csc_auto) 3032 { 3033 error ("%<auto%> in file-scope empty declaration"); 3034 warned = 1; 3035 } 3036 3037 if (current_scope == file_scope && declspecs->storage_class == csc_register) 3038 { 3039 error ("%<register%> in file-scope empty declaration"); 3040 warned = 1; 3041 } 3042 3043 if (!warned && !in_system_header && declspecs->storage_class != csc_none) 3044 { 3045 warning (0, "useless storage class specifier in empty declaration"); 3046 warned = 2; 3047 } 3048 3049 if (!warned && !in_system_header && declspecs->thread_p) 3050 { 3051 warning (0, "useless %<__thread%> in empty declaration"); 3052 warned = 2; 3053 } 3054 3055 if (!warned && !in_system_header && (declspecs->const_p 3056 || declspecs->volatile_p 3057 || declspecs->restrict_p)) 3058 { 3059 warning (0, "useless type qualifier in empty declaration"); 3060 warned = 2; 3061 } 3062 3063 if (warned != 1) 3064 { 3065 if (!found_tag) 3066 pedwarn ("empty declaration"); 3067 } 3068} 3069 3070 3071/* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_* 3072 bits. SPECS represents declaration specifiers that the grammar 3073 only permits to contain type qualifiers and attributes. */ 3074 3075int 3076quals_from_declspecs (const struct c_declspecs *specs) 3077{ 3078 int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0) 3079 | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0) 3080 | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0)); 3081 gcc_assert (!specs->type 3082 && !specs->decl_attr 3083 && specs->typespec_word == cts_none 3084 && specs->storage_class == csc_none 3085 && !specs->typedef_p 3086 && !specs->explicit_signed_p 3087 && !specs->deprecated_p 3088 && !specs->long_p 3089 && !specs->long_long_p 3090 && !specs->short_p 3091 && !specs->signed_p 3092 && !specs->unsigned_p 3093 && !specs->complex_p 3094 && !specs->inline_p 3095 && !specs->thread_p); 3096 return quals; 3097} 3098 3099/* Construct an array declarator. EXPR is the expression inside [], 3100 or NULL_TREE. QUALS are the type qualifiers inside the [] (to be 3101 applied to the pointer to which a parameter array is converted). 3102 STATIC_P is true if "static" is inside the [], false otherwise. 3103 VLA_UNSPEC_P is true if the array is [*], a VLA of unspecified 3104 length which is nevertheless a complete type, false otherwise. The 3105 field for the contained declarator is left to be filled in by 3106 set_array_declarator_inner. */ 3107 3108struct c_declarator * 3109build_array_declarator (tree expr, struct c_declspecs *quals, bool static_p, 3110 bool vla_unspec_p) 3111{ 3112 struct c_declarator *declarator = XOBNEW (&parser_obstack, 3113 struct c_declarator); 3114 declarator->kind = cdk_array; 3115 declarator->declarator = 0; 3116 declarator->u.array.dimen = expr; 3117 if (quals) 3118 { 3119 declarator->u.array.attrs = quals->attrs; 3120 declarator->u.array.quals = quals_from_declspecs (quals); 3121 } 3122 else 3123 { 3124 declarator->u.array.attrs = NULL_TREE; 3125 declarator->u.array.quals = 0; 3126 } 3127 declarator->u.array.static_p = static_p; 3128 declarator->u.array.vla_unspec_p = vla_unspec_p; 3129 if (pedantic && !flag_isoc99) 3130 { 3131 if (static_p || quals != NULL) 3132 pedwarn ("ISO C90 does not support %<static%> or type " 3133 "qualifiers in parameter array declarators"); 3134 if (vla_unspec_p) 3135 pedwarn ("ISO C90 does not support %<[*]%> array declarators"); 3136 } 3137 if (vla_unspec_p) 3138 { 3139 if (!current_scope->parm_flag) 3140 { 3141 /* C99 6.7.5.2p4 */ 3142 error ("%<[*]%> not allowed in other than function prototype scope"); 3143 declarator->u.array.vla_unspec_p = false; 3144 return NULL; 3145 } 3146 current_scope->had_vla_unspec = true; 3147 } 3148 return declarator; 3149} 3150 3151/* Set the contained declarator of an array declarator. DECL is the 3152 declarator, as constructed by build_array_declarator; INNER is what 3153 appears on the left of the []. */ 3154 3155struct c_declarator * 3156set_array_declarator_inner (struct c_declarator *decl, 3157 struct c_declarator *inner, 3158 bool abstract_p __attribute__ ((__unused__))) 3159{ 3160 decl->declarator = inner; 3161 return decl; 3162} 3163 3164/* INIT is a constructor that forms DECL's initializer. If the final 3165 element initializes a flexible array field, add the size of that 3166 initializer to DECL's size. */ 3167 3168static void 3169add_flexible_array_elts_to_size (tree decl, tree init) 3170{ 3171 tree elt, type; 3172 3173 if (VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (init))) 3174 return; 3175 3176 elt = VEC_last (constructor_elt, CONSTRUCTOR_ELTS (init))->value; 3177 type = TREE_TYPE (elt); 3178 if (TREE_CODE (type) == ARRAY_TYPE 3179 && TYPE_SIZE (type) == NULL_TREE 3180 && TYPE_DOMAIN (type) != NULL_TREE 3181 && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) == NULL_TREE) 3182 { 3183 complete_array_type (&type, elt, false); 3184 DECL_SIZE (decl) 3185 = size_binop (PLUS_EXPR, DECL_SIZE (decl), TYPE_SIZE (type)); 3186 DECL_SIZE_UNIT (decl) 3187 = size_binop (PLUS_EXPR, DECL_SIZE_UNIT (decl), TYPE_SIZE_UNIT (type)); 3188 } 3189} 3190 3191/* APPLE LOCAL begin blocks 6339747 */ 3192/* Decode a block literal type, such as "int **", returning a ...FUNCTION_DECL node. */ 3193 3194tree 3195grokblockdecl (struct c_declspecs *specs, struct c_declarator *declarator) 3196{ 3197 tree decl; 3198 tree attrs = specs->attrs; 3199 3200 specs->attrs = NULL_TREE; 3201 3202 decl = grokdeclarator (declarator, specs, BLOCKDEF, 3203 false, NULL); 3204 3205 /* Apply attributes. */ 3206 decl_attributes (&decl, attrs, 0); 3207 3208 return decl; 3209} 3210/* APPLE LOCAL end blocks 6339747 */ 3211 3212/* Decode a "typename", such as "int **", returning a ..._TYPE node. */ 3213 3214tree 3215groktypename (struct c_type_name *type_name) 3216{ 3217 tree type; 3218 tree attrs = type_name->specs->attrs; 3219 3220 type_name->specs->attrs = NULL_TREE; 3221 3222 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME, 3223 false, NULL); 3224 3225 /* Apply attributes. */ 3226 decl_attributes (&type, attrs, 0); 3227 3228 return type; 3229} 3230 3231/* Decode a declarator in an ordinary declaration or data definition. 3232 This is called as soon as the type information and variable name 3233 have been parsed, before parsing the initializer if any. 3234 Here we create the ..._DECL node, fill in its type, 3235 and put it on the list of decls for the current context. 3236 The ..._DECL node is returned as the value. 3237 3238 Exception: for arrays where the length is not specified, 3239 the type is left null, to be filled in by `finish_decl'. 3240 3241 Function definitions do not come here; they go to start_function 3242 instead. However, external and forward declarations of functions 3243 do go through here. Structure field declarations are done by 3244 grokfield and not through here. */ 3245 3246tree 3247start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs, 3248 bool initialized, tree attributes) 3249{ 3250 tree decl; 3251 tree tem; 3252 3253 /* An object declared as __attribute__((deprecated)) suppresses 3254 warnings of uses of other deprecated items. */ 3255 /* APPLE LOCAL begin "unavailable" attribute (radar 2809697) */ 3256 /* An object declared as __attribute__((unavailable)) suppresses 3257 any reports of being declared with unavailable or deprecated 3258 items. An object declared as __attribute__((deprecated)) 3259 suppresses warnings of uses of other deprecated items. */ 3260#ifdef A_LESS_INEFFICENT_WAY /* which I really don't want to do! */ 3261 if (lookup_attribute ("deprecated", attributes)) 3262 deprecated_state = DEPRECATED_SUPPRESS; 3263 else if (lookup_attribute ("unavailable", attributes)) 3264 deprecated_state = DEPRECATED_UNAVAILABLE_SUPPRESS; 3265#else /* a more efficient way doing what lookup_attribute would do */ 3266 tree a; 3267 3268 for (a = attributes; a; a = TREE_CHAIN (a)) 3269 { 3270 tree name = TREE_PURPOSE (a); 3271 if (TREE_CODE (name) == IDENTIFIER_NODE) 3272 if (is_attribute_p ("deprecated", name)) 3273 { 3274 deprecated_state = DEPRECATED_SUPPRESS; 3275 break; 3276 } 3277 if (is_attribute_p ("unavailable", name)) 3278 { 3279 deprecated_state = DEPRECATED_UNAVAILABLE_SUPPRESS; 3280 break; 3281 } 3282 } 3283#endif 3284 /* APPLE LOCAL end "unavailable" attribute (radar 2809697) */ 3285 3286 decl = grokdeclarator (declarator, declspecs, 3287 NORMAL, initialized, NULL); 3288 if (!decl) 3289 return 0; 3290 3291 deprecated_state = DEPRECATED_NORMAL; 3292 3293 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL 3294 && MAIN_NAME_P (DECL_NAME (decl))) 3295 warning (OPT_Wmain, "%q+D is usually a function", decl); 3296 3297 if (initialized) 3298 /* Is it valid for this decl to have an initializer at all? 3299 If not, set INITIALIZED to zero, which will indirectly 3300 tell 'finish_decl' to ignore the initializer once it is parsed. */ 3301 switch (TREE_CODE (decl)) 3302 { 3303 case TYPE_DECL: 3304 error ("typedef %qD is initialized (use __typeof__ instead)", decl); 3305 initialized = 0; 3306 break; 3307 3308 case FUNCTION_DECL: 3309 error ("function %qD is initialized like a variable", decl); 3310 initialized = 0; 3311 break; 3312 3313 case PARM_DECL: 3314 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */ 3315 error ("parameter %qD is initialized", decl); 3316 initialized = 0; 3317 break; 3318 3319 default: 3320 /* Don't allow initializations for incomplete types except for 3321 arrays which might be completed by the initialization. */ 3322 3323 /* This can happen if the array size is an undefined macro. 3324 We already gave a warning, so we don't need another one. */ 3325 if (TREE_TYPE (decl) == error_mark_node) 3326 initialized = 0; 3327 else if (COMPLETE_TYPE_P (TREE_TYPE (decl))) 3328 { 3329 /* A complete type is ok if size is fixed. */ 3330 3331 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST 3332 || C_DECL_VARIABLE_SIZE (decl)) 3333 { 3334 error ("variable-sized object may not be initialized"); 3335 initialized = 0; 3336 } 3337 } 3338 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE) 3339 { 3340 error ("variable %qD has initializer but incomplete type", decl); 3341 initialized = 0; 3342 } 3343 else if (C_DECL_VARIABLE_SIZE (decl)) 3344 { 3345 /* Although C99 is unclear about whether incomplete arrays 3346 of VLAs themselves count as VLAs, it does not make 3347 sense to permit them to be initialized given that 3348 ordinary VLAs may not be initialized. */ 3349 error ("variable-sized object may not be initialized"); 3350 initialized = 0; 3351 } 3352 } 3353 3354 if (initialized) 3355 { 3356 if (current_scope == file_scope) 3357 TREE_STATIC (decl) = 1; 3358 3359 /* Tell 'pushdecl' this is an initialized decl 3360 even though we don't yet have the initializer expression. 3361 Also tell 'finish_decl' it may store the real initializer. */ 3362 DECL_INITIAL (decl) = error_mark_node; 3363 } 3364 3365 /* If this is a function declaration, write a record describing it to the 3366 prototypes file (if requested). */ 3367 3368 if (TREE_CODE (decl) == FUNCTION_DECL) 3369 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0); 3370 3371 /* ANSI specifies that a tentative definition which is not merged with 3372 a non-tentative definition behaves exactly like a definition with an 3373 initializer equal to zero. (Section 3.7.2) 3374 3375 -fno-common gives strict ANSI behavior, though this tends to break 3376 a large body of code that grew up without this rule. 3377 3378 Thread-local variables are never common, since there's no entrenched 3379 body of code to break, and it allows more efficient variable references 3380 in the presence of dynamic linking. */ 3381 3382 if (TREE_CODE (decl) == VAR_DECL 3383 && !initialized 3384 && TREE_PUBLIC (decl) 3385 && !DECL_THREAD_LOCAL_P (decl) 3386 && !flag_no_common) 3387 DECL_COMMON (decl) = 1; 3388 3389 /* Set attributes here so if duplicate decl, will have proper attributes. */ 3390 decl_attributes (&decl, attributes, 0); 3391 3392 /* Handle gnu_inline attribute. */ 3393 if (declspecs->inline_p 3394 && !flag_gnu89_inline 3395 && TREE_CODE (decl) == FUNCTION_DECL 3396 && lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl))) 3397 { 3398 if (declspecs->storage_class == csc_auto && current_scope != file_scope) 3399 ; 3400 else if (declspecs->storage_class != csc_static) 3401 DECL_EXTERNAL (decl) = !DECL_EXTERNAL (decl); 3402 } 3403 3404 if (TREE_CODE (decl) == FUNCTION_DECL 3405 && targetm.calls.promote_prototypes (TREE_TYPE (decl))) 3406 { 3407 struct c_declarator *ce = declarator; 3408 3409 if (ce->kind == cdk_pointer) 3410 ce = declarator->declarator; 3411 if (ce->kind == cdk_function) 3412 { 3413 tree args = ce->u.arg_info->parms; 3414 for (; args; args = TREE_CHAIN (args)) 3415 { 3416 tree type = TREE_TYPE (args); 3417 if (type && INTEGRAL_TYPE_P (type) 3418 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node)) 3419 DECL_ARG_TYPE (args) = integer_type_node; 3420 } 3421 } 3422 } 3423 3424 if (TREE_CODE (decl) == FUNCTION_DECL 3425 && DECL_DECLARED_INLINE_P (decl) 3426 && DECL_UNINLINABLE (decl) 3427 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl))) 3428 warning (OPT_Wattributes, "inline function %q+D given attribute noinline", 3429 decl); 3430 3431 /* C99 6.7.4p3: An inline definition of a function with external 3432 linkage shall not contain a definition of a modifiable object 3433 with static storage duration... */ 3434 if (TREE_CODE (decl) == VAR_DECL 3435 && current_scope != file_scope 3436 && TREE_STATIC (decl) 3437 && !TREE_READONLY (decl) 3438 && DECL_DECLARED_INLINE_P (current_function_decl) 3439 && DECL_EXTERNAL (current_function_decl)) 3440 pedwarn ("%q+D is static but declared in inline function %qD " 3441 "which is not static", decl, current_function_decl); 3442 3443 /* Add this decl to the current scope. 3444 TEM may equal DECL or it may be a previous decl of the same name. */ 3445 tem = pushdecl (decl); 3446 3447 if (initialized && DECL_EXTERNAL (tem)) 3448 { 3449 DECL_EXTERNAL (tem) = 0; 3450 TREE_STATIC (tem) = 1; 3451 } 3452 3453 return tem; 3454} 3455 3456/* Initialize EH if not initialized yet and exceptions are enabled. */ 3457 3458void 3459c_maybe_initialize_eh (void) 3460{ 3461 if (!flag_exceptions || c_eh_initialized_p) 3462 return; 3463 3464 c_eh_initialized_p = true; 3465 eh_personality_libfunc 3466 = init_one_libfunc (USING_SJLJ_EXCEPTIONS 3467 ? "__gcc_personality_sj0" 3468 : "__gcc_personality_v0"); 3469 default_init_unwind_resume_libfunc (); 3470 using_eh_for_cleanups (); 3471} 3472 3473/* APPLE LOCAL begin radar 5932809 - copyable byref blocks (C++ cr) */ 3474#define BLOCK_ALIGN_MAX 18 3475static tree block_byref_id_object_copy[BLOCK_BYREF_CURRENT_MAX*(BLOCK_ALIGN_MAX+1)]; 3476static tree block_byref_id_object_dispose[BLOCK_BYREF_CURRENT_MAX*(BLOCK_ALIGN_MAX+1)]; 3477 3478/** 3479 This routine builds: 3480 3481 void __Block_byref_id_object_copy(struct Block_byref_id_object *dst, 3482 struct Block_byref_id_object *src) { 3483 _Block_object_assign (&_dest->object, _src->object, BLOCK_FIELD_IS_OBJECT[|BLOCK_FIELD_IS_WEAK]) // objects 3484 _Block_object_assign(&_dest->object, _src->object, BLOCK_FIELD_IS_BLOCK[|BLOCK_FIELD_IS_WEAK]) // blocks 3485 } */ 3486static void 3487synth_block_byref_id_object_copy_func (int flag, int kind) 3488{ 3489 tree stmt, fnbody; 3490 tree dst_arg, src_arg; 3491 tree dst_obj, src_obj; 3492 struct c_arg_info * arg_info; 3493 tree call_exp; 3494 gcc_assert (block_byref_id_object_copy[kind]); 3495 /* Set up: (void* _dest, void*_src) parameters. */ 3496 dst_arg = build_decl (PARM_DECL, get_identifier ("_dst"), 3497 ptr_type_node); 3498 TREE_USED (dst_arg) = 1; 3499 DECL_ARG_TYPE (dst_arg) = ptr_type_node; 3500 src_arg = build_decl (PARM_DECL, get_identifier ("_src"), 3501 ptr_type_node); 3502 TREE_USED (src_arg) = 1; 3503 DECL_ARG_TYPE (src_arg) = ptr_type_node; 3504 arg_info = xcalloc (1, sizeof (struct c_arg_info)); 3505 TREE_CHAIN (dst_arg) = src_arg; 3506 arg_info->parms = dst_arg; 3507 arg_info->types = tree_cons (NULL_TREE, ptr_type_node, 3508 tree_cons (NULL_TREE, 3509 ptr_type_node, 3510 NULL_TREE)); 3511 /* function header synthesis. */ 3512 push_function_context (); 3513 start_block_helper_function (block_byref_id_object_copy[kind]); 3514 store_parm_decls_from (arg_info); 3515 3516 /* Body of the function. */ 3517 stmt = c_begin_compound_stmt (true); 3518 /* Build dst->object */ 3519 dst_obj = build_indirect_object_id_exp (dst_arg); 3520 3521 3522 /* src_obj is: _src->object. */ 3523 src_obj = build_indirect_object_id_exp (src_arg); 3524 3525 /* APPLE LOCAL begin radar 6180456 */ 3526 /* _Block_object_assign (&_dest->object, _src->object, BLOCK_FIELD_IS_OBJECT) or : 3527 _Block_object_assign (&_dest->object, _src->object, BLOCK_FIELD_IS_BLOCK) */ 3528 /* APPLE LOCAL begin radar 6573923 */ 3529 /* Also add the new flag when calling _Block_object_dispose 3530 from byref dispose helper. */ 3531 flag |= BLOCK_BYREF_CALLER; 3532 /* APPLE LOCAL end radar 6573923 */ 3533 call_exp = build_block_object_assign_call_exp (build_fold_addr_expr (dst_obj), src_obj, flag); 3534 add_stmt (call_exp); 3535 /* APPLE LOCAL end radar 6180456 */ 3536 3537 fnbody = c_end_compound_stmt (stmt, true); 3538 add_stmt (fnbody); 3539 finish_function (); 3540 pop_function_context (); 3541 free (arg_info); 3542} 3543 3544/** 3545 This routine builds: 3546 3547 void __Block_byref_id_object_dispose(struct Block_byref_id_object *_src) { 3548 _Block_object_dispose(_src->object, BLOCK_FIELD_IS_OBJECT[|BLOCK_FIELD_IS_WEAK]) // object 3549 _Block_object_dispose(_src->object, BLOCK_FIELD_IS_BLOCK[|BLOCK_FIELD_IS_WEAK]) // block 3550 } */ 3551static void 3552synth_block_byref_id_object_dispose_func (int flag, int kind) 3553{ 3554 tree stmt, fnbody; 3555 tree src_arg, src_obj, rel_exp; 3556 struct c_arg_info * arg_info; 3557 gcc_assert (block_byref_id_object_dispose[kind]); 3558 /* Set up: (void *_src) parameter. */ 3559 src_arg = build_decl (PARM_DECL, get_identifier ("_src"), 3560 ptr_type_node); 3561 TREE_USED (src_arg) = 1; 3562 DECL_ARG_TYPE (src_arg) = ptr_type_node; 3563 arg_info = xcalloc (1, sizeof (struct c_arg_info)); 3564 arg_info->parms = src_arg; 3565 arg_info->types = tree_cons (NULL_TREE, ptr_type_node, 3566 NULL_TREE); 3567 /* function header synthesis. */ 3568 push_function_context (); 3569 start_block_helper_function (block_byref_id_object_dispose[kind]); 3570 store_parm_decls_from (arg_info); 3571 3572 /* Body of the function. */ 3573 stmt = c_begin_compound_stmt (true); 3574 src_obj = build_indirect_object_id_exp (src_arg); 3575 3576 /* APPLE LOCAL begin radar 6180456 */ 3577 /* _Block_object_dispose(_src->object, BLOCK_FIELD_IS_OBJECT) : or 3578 _Block_object_dispose(_src->object, BLOCK_FIELD_IS_BLOCK) */ 3579 /* APPLE LOCAL begin radar 6573923 */ 3580 /* Also add the new flag when calling _Block_object_dispose 3581 from byref dispose helper. */ 3582 flag |= BLOCK_BYREF_CALLER; 3583 /* APPLE LOCAL end radar 6573923 */ 3584 rel_exp = build_block_object_dispose_call_exp (src_obj, flag); 3585 /* APPLE LOCAL end radar 6180456 */ 3586 add_stmt (rel_exp); 3587 3588 fnbody = c_end_compound_stmt (stmt, true); 3589 add_stmt (fnbody); 3590 finish_function (); 3591 pop_function_context (); 3592 free (arg_info); 3593} 3594 3595/* new_block_byref_decl - This routine changes a 'typex x' declared variable into: 3596 3597 struct __Block_byref_x { 3598 // APPLE LOCAL radar 6244520 3599 void *__isa; // NULL for everything except __weak pointers 3600 struct Block_byref_x *__forwarding; 3601 int32_t __flags; 3602 int32_t __size; 3603 void *__ByrefKeepFuncPtr; // Only if variable is __block ObjC object 3604 void *__ByrefDestroyFuncPtr; // Only if variable is __block ObjC object 3605 typex x; 3606 } x; 3607*/ 3608 3609static tree 3610new_block_byref_decl (tree decl) 3611{ 3612 static int unique_count; 3613 /* APPLE LOCAL radar 5847976 */ 3614 int save_flag_objc_gc; 3615 tree Block_byref_type; 3616 tree field_decl_chain, field_decl; 3617 const char *prefix = "__Block_byref_"; 3618 char *string = alloca (strlen (IDENTIFIER_POINTER (DECL_NAME (decl))) + 3619 strlen (prefix) + 8 /* to hold the count */); 3620 3621 sprintf (string, "%s%d_%s", prefix, ++unique_count, 3622 IDENTIFIER_POINTER (DECL_NAME (decl))); 3623 3624 push_to_top_level (); 3625 Block_byref_type = start_struct (RECORD_TYPE, get_identifier (string)); 3626 3627 /* APPLE LOCAL begin radar 6244520 */ 3628 /* void *__isa; */ 3629 field_decl = build_decl (FIELD_DECL, get_identifier ("__isa"), ptr_type_node); 3630 field_decl_chain = field_decl; 3631 /* APPLE LOCAL end radar 6244520 */ 3632 3633 /* struct Block_byref_x *__forwarding; */ 3634 field_decl = build_decl (FIELD_DECL, get_identifier ("__forwarding"), 3635 build_pointer_type (Block_byref_type)); 3636 /* APPLE LOCAL radar 6244520 */ 3637 chainon (field_decl_chain, field_decl); 3638 3639 /* int32_t __flags; */ 3640 field_decl = build_decl (FIELD_DECL, get_identifier ("__flags"), 3641 unsigned_type_node); 3642 chainon (field_decl_chain, field_decl); 3643 3644 /* int32_t __size; */ 3645 field_decl = build_decl (FIELD_DECL, get_identifier ("__size"), 3646 unsigned_type_node); 3647 chainon (field_decl_chain, field_decl); 3648 3649 if (COPYABLE_BYREF_LOCAL_NONPOD (decl)) 3650 { 3651 /* void *__ByrefKeepFuncPtr; */ 3652 field_decl = build_decl (FIELD_DECL, get_identifier ("__ByrefKeepFuncPtr"), 3653 ptr_type_node); 3654 chainon (field_decl_chain, field_decl); 3655 3656 /* void *__ByrefDestroyFuncPtr; */ 3657 field_decl = build_decl (FIELD_DECL, get_identifier ("__ByrefDestroyFuncPtr"), 3658 ptr_type_node); 3659 chainon (field_decl_chain, field_decl); 3660 } 3661 3662 /* typex x; */ 3663 field_decl = build_decl (FIELD_DECL, DECL_NAME (decl), TREE_TYPE (decl)); 3664 chainon (field_decl_chain, field_decl); 3665 3666 pop_from_top_level (); 3667 /* APPLE LOCAL begin radar 5847976 */ 3668 /* Hack so we don't issue warning on a field_decl having __weak attribute */ 3669 save_flag_objc_gc = flag_objc_gc; 3670 flag_objc_gc = 0; 3671 finish_struct (Block_byref_type, field_decl_chain, NULL_TREE); 3672 flag_objc_gc = save_flag_objc_gc; 3673 /* APPLE LOCAL end radar 5847976 */ 3674 3675 TREE_TYPE (decl) = Block_byref_type; 3676 /* Force layout_decl to recompute these fields. */ 3677 DECL_SIZE (decl) = DECL_SIZE_UNIT (decl) = 0; 3678 layout_decl (decl, 0); 3679 return decl; 3680} 3681 3682/* init_byref_decl - This routine builds the initializer for the __Block_byref_x 3683 type in the form of: 3684 { NULL, &x, 0, sizeof(struct __Block_byref_x), initializer-expr}; 3685 3686 or: 3687 { NULL, &x, 0, sizeof(struct __Block_byref_x)}; 3688 when INIT is NULL_TREE 3689 3690 For __block ObjC objects, it also adds "byref_keep" and "byref_destroy" 3691 Funtion pointers. So the most general initializers would be: 3692 3693 { NULL, &x, 0, sizeof(struct __Block_byref_x), &byref_keep, &byref_destroy, 3694 &initializer-expr}; 3695*/ 3696static tree 3697/* APPLE LOCAL radar 5847976 */ 3698init_byref_decl (tree decl, tree init, int flag) 3699{ 3700 tree initlist; 3701 tree block_byref_type = TREE_TYPE (decl); 3702 int size = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (block_byref_type)); 3703 unsigned flags = 0; 3704 tree fields; 3705 3706 if (COPYABLE_BYREF_LOCAL_NONPOD (decl)) 3707 flags = BLOCK_HAS_COPY_DISPOSE; 3708 3709 fields = TYPE_FIELDS (block_byref_type); 3710 /* APPLE LOCAL begin radar 6244520 */ 3711 /* APPLE LOCAL begin radar 5847976 */ 3712 initlist = tree_cons (fields, fold_convert (ptr_type_node, ((flag & BLOCK_FIELD_IS_WEAK) != 0) ? integer_one_node 3713 : integer_zero_node), 0); 3714 /* APPLE LOCAL end radar 5847976 */ 3715 fields = TREE_CHAIN (fields); 3716 3717 initlist = tree_cons (fields, 3718 build_unary_op (ADDR_EXPR, decl, 0), initlist); 3719 /* APPLE LOCAL end radar 6244520 */ 3720 fields = TREE_CHAIN (fields); 3721 3722 initlist = tree_cons (fields, build_int_cst (TREE_TYPE (fields), flags), 3723 initlist); 3724 fields = TREE_CHAIN (fields); 3725 initlist = tree_cons (fields, build_int_cst (TREE_TYPE (fields), size), 3726 initlist); 3727 fields = TREE_CHAIN (fields); 3728 3729 if (COPYABLE_BYREF_LOCAL_NONPOD (decl)) 3730 { 3731 char name[64]; 3732 int align = exact_log2 ((DECL_ALIGN (decl)+TYPE_ALIGN (ptr_type_node)-1) / TYPE_ALIGN (ptr_type_node)); 3733 int kind; 3734 if (align == -1 || align > BLOCK_ALIGN_MAX) { 3735 error ("invalid alignment for __block variable"); 3736 kind = 0; 3737 } else 3738 kind = align*BLOCK_BYREF_CURRENT_MAX + flag; 3739 /* Add &__Block_byref_id_object_copy, &__Block_byref_id_object_dispose 3740 initializers. */ 3741 if (!block_byref_id_object_copy[kind]) 3742 { 3743 /* Build a void __Block_byref_id_object_copy(void*, void*) type. */ 3744 tree func_type = 3745 build_function_type (void_type_node, 3746 tree_cons (NULL_TREE, ptr_type_node, 3747 tree_cons (NULL_TREE, ptr_type_node, 3748 void_list_node))); 3749 sprintf (name, "__Block_byref_id_object_copy%d", kind); 3750 block_byref_id_object_copy[kind] = build_helper_func_decl (get_identifier (name), 3751 func_type); 3752 /* Synthesize function definition. */ 3753 synth_block_byref_id_object_copy_func (flag, kind); 3754 } 3755 initlist = tree_cons (fields, 3756 build_fold_addr_expr (block_byref_id_object_copy[kind]), 3757 initlist); 3758 fields = TREE_CHAIN (fields); 3759 3760 if (!block_byref_id_object_dispose[kind]) 3761 { 3762 /* Synthesize void __Block_byref_id_object_dispose (void*) and 3763 build &__Block_byref_id_object_dispose. */ 3764 tree func_type = 3765 build_function_type (void_type_node, 3766 tree_cons (NULL_TREE, ptr_type_node, void_list_node)); 3767 sprintf (name, "__Block_byref_id_object_dispose%d", kind); 3768 block_byref_id_object_dispose[kind] = build_helper_func_decl (get_identifier (name), 3769 func_type); 3770 /* Synthesize function definition. */ 3771 synth_block_byref_id_object_dispose_func (flag, kind); 3772 } 3773 initlist = tree_cons (fields, 3774 build_fold_addr_expr (block_byref_id_object_dispose[kind]), 3775 initlist); 3776 fields = TREE_CHAIN (fields); 3777 } 3778 3779 if (init) 3780 { 3781 init = do_digest_init (TREE_TYPE (fields), init); 3782 initlist = tree_cons (fields, init, initlist); 3783 } 3784 init = build_constructor_from_list (block_byref_type, nreverse (initlist)); 3785 return init; 3786} 3787/* APPLE LOCAL end radar 5932809 - copyable byref blocks (C++ cr) */ 3788 3789/* Finish processing of a declaration; 3790 install its initial value. 3791 If the length of an array type is not known before, 3792 it must be determined now, from the initial value, or it is an error. */ 3793 3794void 3795finish_decl (tree decl, tree init, tree asmspec_tree) 3796{ 3797 tree type; 3798 int was_incomplete = (DECL_SIZE (decl) == 0); 3799 const char *asmspec = 0; 3800 3801 /* If a name was specified, get the string. */ 3802 if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL) 3803 && DECL_FILE_SCOPE_P (decl)) 3804 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree); 3805 if (asmspec_tree) 3806 asmspec = TREE_STRING_POINTER (asmspec_tree); 3807 3808 /* If `start_decl' didn't like having an initialization, ignore it now. */ 3809 if (init != 0 && DECL_INITIAL (decl) == 0) 3810 init = 0; 3811 3812 /* Don't crash if parm is initialized. */ 3813 if (TREE_CODE (decl) == PARM_DECL) 3814 init = 0; 3815 /* APPLE LOCAL begin radar 5932809 - copyable byref blocks (C++ cq) */ 3816 /* We build a new type for each local variable declared as __block 3817 and initialize it to a list of initializers. */ 3818 else if (TREE_CODE (decl) == VAR_DECL && COPYABLE_BYREF_LOCAL_VAR (decl)) 3819 { 3820 if (DECL_EXTERNAL (decl) || TREE_STATIC (decl)) 3821 { 3822 error ("__block attribute on %q+D not allowed, only allowed on local variables", decl); 3823 COPYABLE_BYREF_LOCAL_VAR (decl) = 0; 3824 COPYABLE_BYREF_LOCAL_NONPOD (decl) = 0; 3825 } 3826 else 3827 { 3828 int flag = 0; 3829 if (objc_is_gcable_type (TREE_TYPE (decl)) == -1) 3830 flag = BLOCK_FIELD_IS_WEAK; 3831 if (block_requires_copying (decl)) 3832 { 3833 if (TREE_CODE (TREE_TYPE (decl)) == BLOCK_POINTER_TYPE) 3834 flag |= BLOCK_FIELD_IS_BLOCK; 3835 else 3836 flag |= BLOCK_FIELD_IS_OBJECT; 3837 } 3838 decl = new_block_byref_decl (decl); 3839 /* APPLE LOCAL begin radar 6289031 */ 3840#if 0 3841 if (! flag_objc_gc_only) 3842#endif 3843 { 3844 push_cleanup (decl, build_block_byref_release_exp (decl), false); 3845 } 3846 /* APPLE LOCAL end radar 6289031 */ 3847 /* APPLE LOCAL begin radar 5847976 */ 3848 COPYABLE_WEAK_BLOCK (decl) = ((flag & BLOCK_FIELD_IS_WEAK) != 0); 3849 init = init_byref_decl (decl, init, flag); 3850 /* APPLE LOCAL end radar 5847976 */ 3851 } 3852 } 3853 /* APPLE LOCAL end radar 5932809 - copyable byref blocks (C++ cq) */ 3854 3855 if (init) 3856 store_init_value (decl, init); 3857 3858 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL 3859 || TREE_CODE (decl) == FUNCTION_DECL 3860 || TREE_CODE (decl) == FIELD_DECL)) 3861 objc_check_decl (decl); 3862 3863 type = TREE_TYPE (decl); 3864 3865 /* Deduce size of array from initialization, if not already known. */ 3866 if (TREE_CODE (type) == ARRAY_TYPE 3867 && TYPE_DOMAIN (type) == 0 3868 && TREE_CODE (decl) != TYPE_DECL) 3869 { 3870 bool do_default 3871 = (TREE_STATIC (decl) 3872 /* Even if pedantic, an external linkage array 3873 may have incomplete type at first. */ 3874 ? pedantic && !TREE_PUBLIC (decl) 3875 : !DECL_EXTERNAL (decl)); 3876 int failure 3877 = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl), 3878 do_default); 3879 3880 /* Get the completed type made by complete_array_type. */ 3881 type = TREE_TYPE (decl); 3882 3883 switch (failure) 3884 { 3885 case 1: 3886 error ("initializer fails to determine size of %q+D", decl); 3887 break; 3888 3889 case 2: 3890 if (do_default) 3891 error ("array size missing in %q+D", decl); 3892 /* If a `static' var's size isn't known, 3893 make it extern as well as static, so it does not get 3894 allocated. 3895 If it is not `static', then do not mark extern; 3896 finish_incomplete_decl will give it a default size 3897 and it will get allocated. */ 3898 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl)) 3899 DECL_EXTERNAL (decl) = 1; 3900 break; 3901 3902 case 3: 3903 error ("zero or negative size array %q+D", decl); 3904 break; 3905 3906 case 0: 3907 /* For global variables, update the copy of the type that 3908 exists in the binding. */ 3909 if (TREE_PUBLIC (decl)) 3910 { 3911 struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl)); 3912 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext)) 3913 b_ext = b_ext->shadowed; 3914 if (b_ext) 3915 { 3916 if (b_ext->type) 3917 b_ext->type = composite_type (b_ext->type, type); 3918 else 3919 b_ext->type = type; 3920 } 3921 } 3922 break; 3923 3924 default: 3925 gcc_unreachable (); 3926 } 3927 3928 if (DECL_INITIAL (decl)) 3929 TREE_TYPE (DECL_INITIAL (decl)) = type; 3930 3931 layout_decl (decl, 0); 3932 } 3933 3934 if (TREE_CODE (decl) == VAR_DECL) 3935 { 3936 if (init && TREE_CODE (init) == CONSTRUCTOR) 3937 add_flexible_array_elts_to_size (decl, init); 3938 3939 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node 3940 && COMPLETE_TYPE_P (TREE_TYPE (decl))) 3941 layout_decl (decl, 0); 3942 3943 if (DECL_SIZE (decl) == 0 3944 /* Don't give an error if we already gave one earlier. */ 3945 && TREE_TYPE (decl) != error_mark_node 3946 && (TREE_STATIC (decl) 3947 /* A static variable with an incomplete type 3948 is an error if it is initialized. 3949 Also if it is not file scope. 3950 Otherwise, let it through, but if it is not `extern' 3951 then it may cause an error message later. */ 3952 ? (DECL_INITIAL (decl) != 0 3953 || !DECL_FILE_SCOPE_P (decl)) 3954 /* An automatic variable with an incomplete type 3955 is an error. */ 3956 : !DECL_EXTERNAL (decl))) 3957 { 3958 error ("storage size of %q+D isn%'t known", decl); 3959 TREE_TYPE (decl) = error_mark_node; 3960 } 3961 3962 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl)) 3963 && DECL_SIZE (decl) != 0) 3964 { 3965 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST) 3966 constant_expression_warning (DECL_SIZE (decl)); 3967 else 3968 error ("storage size of %q+D isn%'t constant", decl); 3969 } 3970 3971 if (TREE_USED (type)) 3972 TREE_USED (decl) = 1; 3973 } 3974 3975 /* If this is a function and an assembler name is specified, reset DECL_RTL 3976 so we can give it its new name. Also, update built_in_decls if it 3977 was a normal built-in. */ 3978 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec) 3979 { 3980 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL) 3981 set_builtin_user_assembler_name (decl, asmspec); 3982 set_user_assembler_name (decl, asmspec); 3983 } 3984 3985 /* If #pragma weak was used, mark the decl weak now. */ 3986 maybe_apply_pragma_weak (decl); 3987 3988 /* Output the assembler code and/or RTL code for variables and functions, 3989 unless the type is an undefined structure or union. 3990 If not, it will get done when the type is completed. */ 3991 3992 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL) 3993 { 3994 /* Determine the ELF visibility. */ 3995 if (TREE_PUBLIC (decl)) 3996 c_determine_visibility (decl); 3997 3998 /* This is a no-op in c-lang.c or something real in objc-act.c. */ 3999 if (c_dialect_objc ()) 4000 objc_check_decl (decl); 4001 4002 if (asmspec) 4003 { 4004 /* If this is not a static variable, issue a warning. 4005 It doesn't make any sense to give an ASMSPEC for an 4006 ordinary, non-register local variable. Historically, 4007 GCC has accepted -- but ignored -- the ASMSPEC in 4008 this case. */ 4009 if (!DECL_FILE_SCOPE_P (decl) 4010 && TREE_CODE (decl) == VAR_DECL 4011 && !C_DECL_REGISTER (decl) 4012 && !TREE_STATIC (decl)) 4013 warning (0, "ignoring asm-specifier for non-static local " 4014 "variable %q+D", decl); 4015 else 4016 set_user_assembler_name (decl, asmspec); 4017 } 4018 4019 if (DECL_FILE_SCOPE_P (decl)) 4020 { 4021 if (DECL_INITIAL (decl) == NULL_TREE 4022 || DECL_INITIAL (decl) == error_mark_node) 4023 /* Don't output anything 4024 when a tentative file-scope definition is seen. 4025 But at end of compilation, do output code for them. */ 4026 DECL_DEFER_OUTPUT (decl) = 1; 4027 rest_of_decl_compilation (decl, true, 0); 4028 } 4029 else 4030 { 4031 /* In conjunction with an ASMSPEC, the `register' 4032 keyword indicates that we should place the variable 4033 in a particular register. */ 4034 if (asmspec && C_DECL_REGISTER (decl)) 4035 { 4036 DECL_HARD_REGISTER (decl) = 1; 4037 /* This cannot be done for a structure with volatile 4038 fields, on which DECL_REGISTER will have been 4039 reset. */ 4040 if (!DECL_REGISTER (decl)) 4041 error ("cannot put object with volatile field into register"); 4042 } 4043 4044 if (TREE_CODE (decl) != FUNCTION_DECL) 4045 { 4046 /* If we're building a variable sized type, and we might be 4047 reachable other than via the top of the current binding 4048 level, then create a new BIND_EXPR so that we deallocate 4049 the object at the right time. */ 4050 /* Note that DECL_SIZE can be null due to errors. */ 4051 if (DECL_SIZE (decl) 4052 && !TREE_CONSTANT (DECL_SIZE (decl)) 4053 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list)) 4054 { 4055 tree bind; 4056 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL); 4057 TREE_SIDE_EFFECTS (bind) = 1; 4058 add_stmt (bind); 4059 BIND_EXPR_BODY (bind) = push_stmt_list (); 4060 } 4061 add_stmt (build_stmt (DECL_EXPR, decl)); 4062 } 4063 } 4064 4065 4066 if (!DECL_FILE_SCOPE_P (decl)) 4067 { 4068 /* Recompute the RTL of a local array now 4069 if it used to be an incomplete type. */ 4070 if (was_incomplete 4071 && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl)) 4072 { 4073 /* If we used it already as memory, it must stay in memory. */ 4074 TREE_ADDRESSABLE (decl) = TREE_USED (decl); 4075 /* If it's still incomplete now, no init will save it. */ 4076 if (DECL_SIZE (decl) == 0) 4077 DECL_INITIAL (decl) = 0; 4078 } 4079 } 4080 } 4081 4082 /* If this was marked 'used', be sure it will be output. */ 4083 if (!flag_unit_at_a_time && lookup_attribute ("used", DECL_ATTRIBUTES (decl))) 4084 mark_decl_referenced (decl); 4085 4086 if (TREE_CODE (decl) == TYPE_DECL) 4087 { 4088 if (!DECL_FILE_SCOPE_P (decl) 4089 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE)) 4090 add_stmt (build_stmt (DECL_EXPR, decl)); 4091 4092 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0); 4093 } 4094 4095 /* At the end of a declaration, throw away any variable type sizes 4096 of types defined inside that declaration. There is no use 4097 computing them in the following function definition. */ 4098 if (current_scope == file_scope) 4099 get_pending_sizes (); 4100 4101 /* Install a cleanup (aka destructor) if one was given. */ 4102 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl)) 4103 { 4104 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl)); 4105 if (attr) 4106 { 4107 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr)); 4108 tree cleanup_decl = lookup_name (cleanup_id); 4109 tree cleanup; 4110 4111 /* Build "cleanup(&decl)" for the destructor. */ 4112 cleanup = build_unary_op (ADDR_EXPR, decl, 0); 4113 cleanup = build_tree_list (NULL_TREE, cleanup); 4114 cleanup = build_function_call (cleanup_decl, cleanup); 4115 4116 /* Don't warn about decl unused; the cleanup uses it. */ 4117 TREE_USED (decl) = 1; 4118 TREE_USED (cleanup_decl) = 1; 4119 4120 /* Initialize EH, if we've been told to do so. */ 4121 c_maybe_initialize_eh (); 4122 4123 push_cleanup (decl, cleanup, false); 4124 } 4125 } 4126} 4127 4128/* Given a parsed parameter declaration, decode it into a PARM_DECL. */ 4129 4130tree 4131grokparm (const struct c_parm *parm) 4132{ 4133 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, 4134 NULL); 4135 4136 decl_attributes (&decl, parm->attrs, 0); 4137 4138 return decl; 4139} 4140 4141/* Given a parsed parameter declaration, decode it into a PARM_DECL 4142 and push that on the current scope. */ 4143 4144void 4145push_parm_decl (const struct c_parm *parm) 4146{ 4147 tree decl; 4148 4149 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL); 4150 decl_attributes (&decl, parm->attrs, 0); 4151 4152 decl = pushdecl (decl); 4153 4154 finish_decl (decl, NULL_TREE, NULL_TREE); 4155} 4156 4157/* Mark all the parameter declarations to date as forward decls. 4158 Also diagnose use of this extension. */ 4159 4160void 4161mark_forward_parm_decls (void) 4162{ 4163 struct c_binding *b; 4164 4165 if (pedantic && !current_scope->warned_forward_parm_decls) 4166 { 4167 pedwarn ("ISO C forbids forward parameter declarations"); 4168 current_scope->warned_forward_parm_decls = true; 4169 } 4170 4171 for (b = current_scope->bindings; b; b = b->prev) 4172 if (TREE_CODE (b->decl) == PARM_DECL) 4173 TREE_ASM_WRITTEN (b->decl) = 1; 4174} 4175 4176/* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound 4177 literal, which may be an incomplete array type completed by the 4178 initializer; INIT is a CONSTRUCTOR that initializes the compound 4179 literal. */ 4180 4181tree 4182build_compound_literal (tree type, tree init) 4183{ 4184 /* We do not use start_decl here because we have a type, not a declarator; 4185 and do not use finish_decl because the decl should be stored inside 4186 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */ 4187 tree decl; 4188 tree complit; 4189 tree stmt; 4190 4191 if (type == error_mark_node) 4192 return error_mark_node; 4193 4194 decl = build_decl (VAR_DECL, NULL_TREE, type); 4195 DECL_EXTERNAL (decl) = 0; 4196 TREE_PUBLIC (decl) = 0; 4197 TREE_STATIC (decl) = (current_scope == file_scope); 4198 DECL_CONTEXT (decl) = current_function_decl; 4199 TREE_USED (decl) = 1; 4200 TREE_TYPE (decl) = type; 4201 TREE_READONLY (decl) = TYPE_READONLY (type); 4202 store_init_value (decl, init); 4203 4204 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type)) 4205 { 4206 int failure = complete_array_type (&TREE_TYPE (decl), 4207 DECL_INITIAL (decl), true); 4208 gcc_assert (!failure); 4209 4210 type = TREE_TYPE (decl); 4211 TREE_TYPE (DECL_INITIAL (decl)) = type; 4212 } 4213 4214 if (type == error_mark_node || !COMPLETE_TYPE_P (type)) 4215 return error_mark_node; 4216 4217 stmt = build_stmt (DECL_EXPR, decl); 4218 complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt); 4219 TREE_SIDE_EFFECTS (complit) = 1; 4220 4221 layout_decl (decl, 0); 4222 4223 if (TREE_STATIC (decl)) 4224 { 4225 /* This decl needs a name for the assembler output. */ 4226 set_compound_literal_name (decl); 4227 DECL_DEFER_OUTPUT (decl) = 1; 4228 DECL_COMDAT (decl) = 1; 4229 DECL_ARTIFICIAL (decl) = 1; 4230 DECL_IGNORED_P (decl) = 1; 4231 pushdecl (decl); 4232 rest_of_decl_compilation (decl, 1, 0); 4233 } 4234 4235 return complit; 4236} 4237 4238/* Determine whether TYPE is a structure with a flexible array member, 4239 or a union containing such a structure (possibly recursively). */ 4240 4241static bool 4242flexible_array_type_p (tree type) 4243{ 4244 tree x; 4245 switch (TREE_CODE (type)) 4246 { 4247 case RECORD_TYPE: 4248 x = TYPE_FIELDS (type); 4249 if (x == NULL_TREE) 4250 return false; 4251 while (TREE_CHAIN (x) != NULL_TREE) 4252 x = TREE_CHAIN (x); 4253 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE 4254 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE 4255 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE 4256 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE) 4257 return true; 4258 return false; 4259 case UNION_TYPE: 4260 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x)) 4261 { 4262 if (flexible_array_type_p (TREE_TYPE (x))) 4263 return true; 4264 } 4265 return false; 4266 default: 4267 return false; 4268 } 4269} 4270 4271/* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME, 4272 replacing with appropriate values if they are invalid. */ 4273static void 4274check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name) 4275{ 4276 tree type_mv; 4277 unsigned int max_width; 4278 unsigned HOST_WIDE_INT w; 4279 const char *name = orig_name ? orig_name: _("<anonymous>"); 4280 4281 /* Detect and ignore out of range field width and process valid 4282 field widths. */ 4283 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width)) 4284 || TREE_CODE (*width) != INTEGER_CST) 4285 { 4286 error ("bit-field %qs width not an integer constant", name); 4287 *width = integer_one_node; 4288 } 4289 else 4290 { 4291 constant_expression_warning (*width); 4292 if (tree_int_cst_sgn (*width) < 0) 4293 { 4294 error ("negative width in bit-field %qs", name); 4295 *width = integer_one_node; 4296 } 4297 else if (integer_zerop (*width) && orig_name) 4298 { 4299 error ("zero width for bit-field %qs", name); 4300 *width = integer_one_node; 4301 } 4302 } 4303 4304 /* Detect invalid bit-field type. */ 4305 if (TREE_CODE (*type) != INTEGER_TYPE 4306 && TREE_CODE (*type) != BOOLEAN_TYPE 4307 && TREE_CODE (*type) != ENUMERAL_TYPE) 4308 { 4309 error ("bit-field %qs has invalid type", name); 4310 *type = unsigned_type_node; 4311 } 4312 4313 type_mv = TYPE_MAIN_VARIANT (*type); 4314 if (pedantic 4315 && !in_system_header 4316 && type_mv != integer_type_node 4317 && type_mv != unsigned_type_node 4318 && type_mv != boolean_type_node) 4319 pedwarn ("type of bit-field %qs is a GCC extension", name); 4320 4321 if (type_mv == boolean_type_node) 4322 max_width = CHAR_TYPE_SIZE; 4323 else 4324 max_width = TYPE_PRECISION (*type); 4325 4326 if (0 < compare_tree_int (*width, max_width)) 4327 { 4328 error ("width of %qs exceeds its type", name); 4329 w = max_width; 4330 *width = build_int_cst (NULL_TREE, w); 4331 } 4332 else 4333 w = tree_low_cst (*width, 1); 4334 4335 if (TREE_CODE (*type) == ENUMERAL_TYPE) 4336 { 4337 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type); 4338 if (!lt 4339 || w < min_precision (lt->enum_min, TYPE_UNSIGNED (*type)) 4340 || w < min_precision (lt->enum_max, TYPE_UNSIGNED (*type))) 4341 warning (0, "%qs is narrower than values of its type", name); 4342 } 4343} 4344 4345 4346 4347/* Print warning about variable length array if necessary. */ 4348 4349static void 4350warn_variable_length_array (const char *name, tree size) 4351{ 4352 int ped = !flag_isoc99 && pedantic && warn_vla != 0; 4353 int const_size = TREE_CONSTANT (size); 4354 4355 if (ped) 4356 { 4357 if (const_size) 4358 { 4359 if (name) 4360 pedwarn ("ISO C90 forbids array %qs whose size " 4361 "can%'t be evaluated", 4362 name); 4363 else 4364 pedwarn ("ISO C90 forbids array whose size " 4365 "can%'t be evaluated"); 4366 } 4367 else 4368 { 4369 if (name) 4370 pedwarn ("ISO C90 forbids variable length array %qs", 4371 name); 4372 else 4373 pedwarn ("ISO C90 forbids variable length array"); 4374 } 4375 } 4376 else if (warn_vla > 0) 4377 { 4378 if (const_size) 4379 { 4380 if (name) 4381 warning (OPT_Wvla, 4382 "the size of array %qs can" 4383 "%'t be evaluated", name); 4384 else 4385 warning (OPT_Wvla, 4386 "the size of array can %'t be evaluated"); 4387 } 4388 else 4389 { 4390 if (name) 4391 warning (OPT_Wvla, 4392 "variable length array %qs is used", 4393 name); 4394 else 4395 warning (OPT_Wvla, 4396 "variable length array is used"); 4397 } 4398 } 4399} 4400 4401/* Given declspecs and a declarator, 4402 determine the name and type of the object declared 4403 and construct a ..._DECL node for it. 4404 (In one case we can return a ..._TYPE node instead. 4405 For invalid input we sometimes return 0.) 4406 4407 DECLSPECS is a c_declspecs structure for the declaration specifiers. 4408 4409 DECL_CONTEXT says which syntactic context this declaration is in: 4410 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL. 4411 FUNCDEF for a function definition. Like NORMAL but a few different 4412 error messages in each case. Return value may be zero meaning 4413 this definition is too screwy to try to parse. 4414 PARM for a parameter declaration (either within a function prototype 4415 or before a function body). Make a PARM_DECL, or return void_type_node. 4416 TYPENAME if for a typename (in a cast or sizeof). 4417 Don't make a DECL node; just return the ..._TYPE node. 4418 FIELD for a struct or union field; make a FIELD_DECL. 4419 INITIALIZED is true if the decl has an initializer. 4420 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node 4421 representing the width of the bit-field. 4422 4423 In the TYPENAME case, DECLARATOR is really an absolute declarator. 4424 It may also be so in the PARM case, for a prototype where the 4425 argument type is specified but not the name. 4426 4427 This function is where the complicated C meanings of `static' 4428 and `extern' are interpreted. */ 4429 4430static tree 4431grokdeclarator (const struct c_declarator *declarator, 4432 struct c_declspecs *declspecs, 4433 enum decl_context decl_context, bool initialized, tree *width) 4434{ 4435 tree type = declspecs->type; 4436 bool threadp = declspecs->thread_p; 4437 enum c_storage_class storage_class = declspecs->storage_class; 4438 int constp; 4439 int restrictp; 4440 int volatilep; 4441 int type_quals = TYPE_UNQUALIFIED; 4442 const char *name, *orig_name; 4443 tree typedef_type = 0; 4444 bool funcdef_flag = false; 4445 bool funcdef_syntax = false; 4446 int size_varies = 0; 4447 tree decl_attr = declspecs->decl_attr; 4448 int array_ptr_quals = TYPE_UNQUALIFIED; 4449 tree array_ptr_attrs = NULL_TREE; 4450 int array_parm_static = 0; 4451 bool array_parm_vla_unspec_p = false; 4452 tree returned_attrs = NULL_TREE; 4453 bool bitfield = width != NULL; 4454 tree element_type; 4455 struct c_arg_info *arg_info = 0; 4456 4457 if (decl_context == FUNCDEF) 4458 funcdef_flag = true, decl_context = NORMAL; 4459 4460 /* Look inside a declarator for the name being declared 4461 and get it as a string, for an error message. */ 4462 { 4463 const struct c_declarator *decl = declarator; 4464 name = 0; 4465 4466 while (decl) 4467 switch (decl->kind) 4468 { 4469 case cdk_function: 4470 case cdk_array: 4471 case cdk_pointer: 4472 /* APPLE LOCAL radar 5732232 - blocks */ 4473 case cdk_block_pointer: 4474 funcdef_syntax = (decl->kind == cdk_function); 4475 decl = decl->declarator; 4476 break; 4477 4478 case cdk_attrs: 4479 decl = decl->declarator; 4480 break; 4481 4482 case cdk_id: 4483 if (decl->u.id) 4484 name = IDENTIFIER_POINTER (decl->u.id); 4485 decl = 0; 4486 break; 4487 4488 default: 4489 gcc_unreachable (); 4490 } 4491 orig_name = name; 4492 if (name == 0) 4493 name = "type name"; 4494 } 4495 4496 /* A function definition's declarator must have the form of 4497 a function declarator. */ 4498 4499 if (funcdef_flag && !funcdef_syntax) 4500 return 0; 4501 4502 /* If this looks like a function definition, make it one, 4503 even if it occurs where parms are expected. 4504 Then store_parm_decls will reject it and not use it as a parm. */ 4505 /* APPLE LOCAL begin "unavailable" attribute (radar 2809697) */ 4506 if (declspecs->unavailable_p) 4507 error_unavailable_use (declspecs->type); 4508 else 4509 /* APPLE LOCAL end "unavailable" attribute (radar 2809697) */ 4510 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag) 4511 decl_context = PARM; 4512 4513 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS) 4514 warn_deprecated_use (declspecs->type); 4515 4516 if ((decl_context == NORMAL || decl_context == FIELD) 4517 && current_scope == file_scope 4518 && variably_modified_type_p (type, NULL_TREE)) 4519 { 4520 error ("variably modified %qs at file scope", name); 4521 type = integer_type_node; 4522 } 4523 4524 typedef_type = type; 4525 size_varies = C_TYPE_VARIABLE_SIZE (type); 4526 4527 /* Diagnose defaulting to "int". */ 4528 4529 if (declspecs->default_int_p && !in_system_header) 4530 { 4531 /* Issue a warning if this is an ISO C 99 program or if 4532 -Wreturn-type and this is a function, or if -Wimplicit; 4533 prefer the former warning since it is more explicit. */ 4534 if ((warn_implicit_int || warn_return_type || flag_isoc99) 4535 && funcdef_flag) 4536 warn_about_return_type = 1; 4537 else if (warn_implicit_int || flag_isoc99) 4538 pedwarn_c99 ("type defaults to %<int%> in declaration of %qs", name); 4539 } 4540 4541 /* Adjust the type if a bit-field is being declared, 4542 -funsigned-bitfields applied and the type is not explicitly 4543 "signed". */ 4544 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p 4545 && TREE_CODE (type) == INTEGER_TYPE) 4546 type = c_common_unsigned_type (type); 4547 4548 /* Figure out the type qualifiers for the declaration. There are 4549 two ways a declaration can become qualified. One is something 4550 like `const int i' where the `const' is explicit. Another is 4551 something like `typedef const int CI; CI i' where the type of the 4552 declaration contains the `const'. A third possibility is that 4553 there is a type qualifier on the element type of a typedefed 4554 array type, in which case we should extract that qualifier so 4555 that c_apply_type_quals_to_decls receives the full list of 4556 qualifiers to work with (C90 is not entirely clear about whether 4557 duplicate qualifiers should be diagnosed in this case, but it 4558 seems most appropriate to do so). */ 4559 element_type = strip_array_types (type); 4560 constp = declspecs->const_p + TYPE_READONLY (element_type); 4561 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type); 4562 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type); 4563 if (pedantic && !flag_isoc99) 4564 { 4565 if (constp > 1) 4566 pedwarn ("duplicate %<const%>"); 4567 if (restrictp > 1) 4568 pedwarn ("duplicate %<restrict%>"); 4569 if (volatilep > 1) 4570 pedwarn ("duplicate %<volatile%>"); 4571 } 4572 if (!flag_gen_aux_info && (TYPE_QUALS (element_type))) 4573 type = TYPE_MAIN_VARIANT (type); 4574 type_quals = ((constp ? TYPE_QUAL_CONST : 0) 4575 | (restrictp ? TYPE_QUAL_RESTRICT : 0) 4576 | (volatilep ? TYPE_QUAL_VOLATILE : 0)); 4577 4578 /* Warn about storage classes that are invalid for certain 4579 kinds of declarations (parameters, typenames, etc.). */ 4580 4581 if (funcdef_flag 4582 && (threadp 4583 || storage_class == csc_auto 4584 || storage_class == csc_register 4585 || storage_class == csc_typedef)) 4586 { 4587 if (storage_class == csc_auto 4588 && (pedantic || current_scope == file_scope)) 4589 pedwarn ("function definition declared %<auto%>"); 4590 if (storage_class == csc_register) 4591 error ("function definition declared %<register%>"); 4592 if (storage_class == csc_typedef) 4593 error ("function definition declared %<typedef%>"); 4594 if (threadp) 4595 error ("function definition declared %<__thread%>"); 4596 threadp = false; 4597 if (storage_class == csc_auto 4598 || storage_class == csc_register 4599 || storage_class == csc_typedef) 4600 storage_class = csc_none; 4601 } 4602 else if (decl_context != NORMAL && (storage_class != csc_none || threadp)) 4603 { 4604 if (decl_context == PARM && storage_class == csc_register) 4605 ; 4606 else 4607 { 4608 switch (decl_context) 4609 { 4610 case FIELD: 4611 error ("storage class specified for structure field %qs", 4612 name); 4613 break; 4614 case PARM: 4615 error ("storage class specified for parameter %qs", name); 4616 break; 4617 default: 4618 error ("storage class specified for typename"); 4619 break; 4620 } 4621 storage_class = csc_none; 4622 threadp = false; 4623 } 4624 } 4625 else if (storage_class == csc_extern 4626 && initialized 4627 && !funcdef_flag) 4628 { 4629 /* 'extern' with initialization is invalid if not at file scope. */ 4630 if (current_scope == file_scope) 4631 { 4632 /* It is fine to have 'extern const' when compiling at C 4633 and C++ intersection. */ 4634 if (!(warn_cxx_compat && constp)) 4635 warning (0, "%qs initialized and declared %<extern%>", name); 4636 } 4637 else 4638 error ("%qs has both %<extern%> and initializer", name); 4639 } 4640 else if (current_scope == file_scope) 4641 { 4642 if (storage_class == csc_auto) 4643 error ("file-scope declaration of %qs specifies %<auto%>", name); 4644 if (pedantic && storage_class == csc_register) 4645 pedwarn ("file-scope declaration of %qs specifies %<register%>", name); 4646 } 4647 else 4648 { 4649 if (storage_class == csc_extern && funcdef_flag) 4650 error ("nested function %qs declared %<extern%>", name); 4651 else if (threadp && storage_class == csc_none) 4652 { 4653 error ("function-scope %qs implicitly auto and declared " 4654 "%<__thread%>", 4655 name); 4656 threadp = false; 4657 } 4658 } 4659 4660 /* Now figure out the structure of the declarator proper. 4661 Descend through it, creating more complex types, until we reach 4662 the declared identifier (or NULL_TREE, in an absolute declarator). 4663 At each stage we maintain an unqualified version of the type 4664 together with any qualifiers that should be applied to it with 4665 c_build_qualified_type; this way, array types including 4666 multidimensional array types are first built up in unqualified 4667 form and then the qualified form is created with 4668 TYPE_MAIN_VARIANT pointing to the unqualified form. */ 4669 4670 while (declarator && declarator->kind != cdk_id) 4671 { 4672 if (type == error_mark_node) 4673 { 4674 declarator = declarator->declarator; 4675 continue; 4676 } 4677 4678 /* Each level of DECLARATOR is either a cdk_array (for ...[..]), 4679 a cdk_pointer (for *...), 4680 a cdk_function (for ...(...)), 4681 a cdk_attrs (for nested attributes), 4682 or a cdk_id (for the name being declared 4683 or the place in an absolute declarator 4684 where the name was omitted). 4685 For the last case, we have just exited the loop. 4686 4687 At this point, TYPE is the type of elements of an array, 4688 or for a function to return, or for a pointer to point to. 4689 After this sequence of ifs, TYPE is the type of the 4690 array or function or pointer, and DECLARATOR has had its 4691 outermost layer removed. */ 4692 4693 if (array_ptr_quals != TYPE_UNQUALIFIED 4694 || array_ptr_attrs != NULL_TREE 4695 || array_parm_static) 4696 { 4697 /* Only the innermost declarator (making a parameter be of 4698 array type which is converted to pointer type) 4699 may have static or type qualifiers. */ 4700 error ("static or type qualifiers in non-parameter array declarator"); 4701 array_ptr_quals = TYPE_UNQUALIFIED; 4702 array_ptr_attrs = NULL_TREE; 4703 array_parm_static = 0; 4704 } 4705 4706 switch (declarator->kind) 4707 { 4708 case cdk_attrs: 4709 { 4710 /* A declarator with embedded attributes. */ 4711 tree attrs = declarator->u.attrs; 4712 const struct c_declarator *inner_decl; 4713 int attr_flags = 0; 4714 declarator = declarator->declarator; 4715 inner_decl = declarator; 4716 while (inner_decl->kind == cdk_attrs) 4717 inner_decl = inner_decl->declarator; 4718 if (inner_decl->kind == cdk_id) 4719 attr_flags |= (int) ATTR_FLAG_DECL_NEXT; 4720 else if (inner_decl->kind == cdk_function) 4721 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT; 4722 else if (inner_decl->kind == cdk_array) 4723 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT; 4724 returned_attrs = decl_attributes (&type, 4725 chainon (returned_attrs, attrs), 4726 attr_flags); 4727 break; 4728 } 4729 case cdk_array: 4730 { 4731 tree itype = NULL_TREE; 4732 tree size = declarator->u.array.dimen; 4733 /* The index is a signed object `sizetype' bits wide. */ 4734 tree index_type = c_common_signed_type (sizetype); 4735 4736 array_ptr_quals = declarator->u.array.quals; 4737 array_ptr_attrs = declarator->u.array.attrs; 4738 array_parm_static = declarator->u.array.static_p; 4739 array_parm_vla_unspec_p = declarator->u.array.vla_unspec_p; 4740 4741 declarator = declarator->declarator; 4742 4743 /* Check for some types that there cannot be arrays of. */ 4744 4745 if (VOID_TYPE_P (type)) 4746 { 4747 error ("declaration of %qs as array of voids", name); 4748 type = error_mark_node; 4749 } 4750 4751 if (TREE_CODE (type) == FUNCTION_TYPE) 4752 { 4753 error ("declaration of %qs as array of functions", name); 4754 type = error_mark_node; 4755 } 4756 4757 if (pedantic && !in_system_header && flexible_array_type_p (type)) 4758 pedwarn ("invalid use of structure with flexible array member"); 4759 4760 if (size == error_mark_node) 4761 type = error_mark_node; 4762 4763 if (type == error_mark_node) 4764 continue; 4765 4766 /* If size was specified, set ITYPE to a range-type for 4767 that size. Otherwise, ITYPE remains null. finish_decl 4768 may figure it out from an initial value. */ 4769 4770 if (size) 4771 { 4772 /* Strip NON_LVALUE_EXPRs since we aren't using as an 4773 lvalue. */ 4774 STRIP_TYPE_NOPS (size); 4775 4776 if (!INTEGRAL_TYPE_P (TREE_TYPE (size))) 4777 { 4778 error ("size of array %qs has non-integer type", name); 4779 size = integer_one_node; 4780 } 4781 4782 if (pedantic && integer_zerop (size)) 4783 pedwarn ("ISO C forbids zero-size array %qs", name); 4784 4785 if (TREE_CODE (size) == INTEGER_CST) 4786 { 4787 constant_expression_warning (size); 4788 if (tree_int_cst_sgn (size) < 0) 4789 { 4790 error ("size of array %qs is negative", name); 4791 size = integer_one_node; 4792 } 4793 } 4794 else if ((decl_context == NORMAL || decl_context == FIELD) 4795 && current_scope == file_scope) 4796 { 4797 error ("variably modified %qs at file scope", name); 4798 size = integer_one_node; 4799 } 4800 else 4801 { 4802 /* Make sure the array size remains visibly 4803 nonconstant even if it is (eg) a const variable 4804 with known value. */ 4805 size_varies = 1; 4806 warn_variable_length_array (orig_name, size); 4807 if (warn_variable_decl) 4808 warning (0, "variable-sized array %qs", name); 4809 } 4810 4811 if (integer_zerop (size)) 4812 { 4813 /* A zero-length array cannot be represented with 4814 an unsigned index type, which is what we'll 4815 get with build_index_type. Create an 4816 open-ended range instead. */ 4817 itype = build_range_type (sizetype, size, NULL_TREE); 4818 } 4819 else 4820 { 4821 /* Arrange for the SAVE_EXPR on the inside of the 4822 MINUS_EXPR, which allows the -1 to get folded 4823 with the +1 that happens when building TYPE_SIZE. */ 4824 if (size_varies) 4825 size = variable_size (size); 4826 4827 /* Compute the maximum valid index, that is, size 4828 - 1. Do the calculation in index_type, so that 4829 if it is a variable the computations will be 4830 done in the proper mode. */ 4831 itype = fold_build2 (MINUS_EXPR, index_type, 4832 convert (index_type, size), 4833 convert (index_type, 4834 size_one_node)); 4835 4836 /* If that overflowed, the array is too big. ??? 4837 While a size of INT_MAX+1 technically shouldn't 4838 cause an overflow (because we subtract 1), the 4839 overflow is recorded during the conversion to 4840 index_type, before the subtraction. Handling 4841 this case seems like an unnecessary 4842 complication. */ 4843 if (TREE_CODE (itype) == INTEGER_CST 4844 && TREE_OVERFLOW (itype)) 4845 { 4846 error ("size of array %qs is too large", name); 4847 type = error_mark_node; 4848 continue; 4849 } 4850 4851 itype = build_index_type (itype); 4852 } 4853 } 4854 else if (decl_context == FIELD) 4855 { 4856 if (pedantic && !flag_isoc99 && !in_system_header) 4857 pedwarn ("ISO C90 does not support flexible array members"); 4858 4859 /* ISO C99 Flexible array members are effectively 4860 identical to GCC's zero-length array extension. */ 4861 itype = build_range_type (sizetype, size_zero_node, NULL_TREE); 4862 } 4863 else if (decl_context == PARM) 4864 { 4865 if (array_parm_vla_unspec_p) 4866 { 4867 if (! orig_name) 4868 { 4869 /* C99 6.7.5.2p4 */ 4870 error ("%<[*]%> not allowed in other than a declaration"); 4871 } 4872 4873 itype = build_range_type (sizetype, size_zero_node, NULL_TREE); 4874 size_varies = 1; 4875 } 4876 } 4877 else if (decl_context == TYPENAME) 4878 { 4879 if (array_parm_vla_unspec_p) 4880 { 4881 /* The error is printed elsewhere. We use this to 4882 avoid messing up with incomplete array types of 4883 the same type, that would otherwise be modified 4884 below. */ 4885 itype = build_range_type (sizetype, size_zero_node, 4886 NULL_TREE); 4887 } 4888 } 4889 4890 /* Complain about arrays of incomplete types. */ 4891 if (!COMPLETE_TYPE_P (type)) 4892 { 4893 error ("array type has incomplete element type"); 4894 type = error_mark_node; 4895 } 4896 else 4897 /* When itype is NULL, a shared incomplete array type is 4898 returned for all array of a given type. Elsewhere we 4899 make sure we don't complete that type before copying 4900 it, but here we want to make sure we don't ever 4901 modify the shared type, so we gcc_assert (itype) 4902 below. */ 4903 type = build_array_type (type, itype); 4904 4905 if (type != error_mark_node) 4906 { 4907 if (size_varies) 4908 { 4909 /* It is ok to modify type here even if itype is 4910 NULL: if size_varies, we're in a 4911 multi-dimensional array and the inner type has 4912 variable size, so the enclosing shared array type 4913 must too. */ 4914 if (size && TREE_CODE (size) == INTEGER_CST) 4915 type 4916 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type)); 4917 C_TYPE_VARIABLE_SIZE (type) = 1; 4918 } 4919 4920 /* The GCC extension for zero-length arrays differs from 4921 ISO flexible array members in that sizeof yields 4922 zero. */ 4923 if (size && integer_zerop (size)) 4924 { 4925 gcc_assert (itype); 4926 TYPE_SIZE (type) = bitsize_zero_node; 4927 TYPE_SIZE_UNIT (type) = size_zero_node; 4928 } 4929 if (array_parm_vla_unspec_p) 4930 { 4931 gcc_assert (itype); 4932 /* The type is complete. C99 6.7.5.2p4 */ 4933 TYPE_SIZE (type) = bitsize_zero_node; 4934 TYPE_SIZE_UNIT (type) = size_zero_node; 4935 } 4936 } 4937 4938 if (decl_context != PARM 4939 && (array_ptr_quals != TYPE_UNQUALIFIED 4940 || array_ptr_attrs != NULL_TREE 4941 || array_parm_static)) 4942 { 4943 error ("static or type qualifiers in non-parameter array declarator"); 4944 array_ptr_quals = TYPE_UNQUALIFIED; 4945 array_ptr_attrs = NULL_TREE; 4946 array_parm_static = 0; 4947 } 4948 break; 4949 } 4950 case cdk_function: 4951 { 4952 /* Say it's a definition only for the declarator closest 4953 to the identifier, apart possibly from some 4954 attributes. */ 4955 bool really_funcdef = false; 4956 tree arg_types; 4957 if (funcdef_flag) 4958 { 4959 const struct c_declarator *t = declarator->declarator; 4960 while (t->kind == cdk_attrs) 4961 t = t->declarator; 4962 really_funcdef = (t->kind == cdk_id); 4963 } 4964 4965 /* Declaring a function type. Make sure we have a valid 4966 type for the function to return. */ 4967 if (type == error_mark_node) 4968 continue; 4969 4970 size_varies = 0; 4971 4972 /* Warn about some types functions can't return. */ 4973 if (TREE_CODE (type) == FUNCTION_TYPE) 4974 { 4975 error ("%qs declared as function returning a function", name); 4976 type = integer_type_node; 4977 } 4978 if (TREE_CODE (type) == ARRAY_TYPE) 4979 { 4980 error ("%qs declared as function returning an array", name); 4981 type = integer_type_node; 4982 } 4983 4984 /* Construct the function type and go to the next 4985 inner layer of declarator. */ 4986 arg_info = declarator->u.arg_info; 4987 arg_types = grokparms (arg_info, really_funcdef); 4988 if (really_funcdef) 4989 put_pending_sizes (arg_info->pending_sizes); 4990 4991 /* Type qualifiers before the return type of the function 4992 qualify the return type, not the function type. */ 4993 if (type_quals) 4994 { 4995 /* Type qualifiers on a function return type are 4996 normally permitted by the standard but have no 4997 effect, so give a warning at -Wreturn-type. 4998 Qualifiers on a void return type are banned on 4999 function definitions in ISO C; GCC used to used 5000 them for noreturn functions. */ 5001 if (VOID_TYPE_P (type) && really_funcdef) 5002 pedwarn ("function definition has qualified void return type"); 5003 else 5004 warning (OPT_Wreturn_type, 5005 "type qualifiers ignored on function return type"); 5006 5007 type = c_build_qualified_type (type, type_quals); 5008 } 5009 type_quals = TYPE_UNQUALIFIED; 5010 5011 type = build_function_type (type, arg_types); 5012 declarator = declarator->declarator; 5013 5014 /* Set the TYPE_CONTEXTs for each tagged type which is local to 5015 the formal parameter list of this FUNCTION_TYPE to point to 5016 the FUNCTION_TYPE node itself. */ 5017 { 5018 tree link; 5019 5020 for (link = arg_info->tags; 5021 link; 5022 link = TREE_CHAIN (link)) 5023 TYPE_CONTEXT (TREE_VALUE (link)) = type; 5024 } 5025 break; 5026 } 5027 case cdk_pointer: 5028 { 5029 /* Merge any constancy or volatility into the target type 5030 for the pointer. */ 5031 5032 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE 5033 && type_quals) 5034 pedwarn ("ISO C forbids qualified function types"); 5035 if (type_quals) 5036 type = c_build_qualified_type (type, type_quals); 5037 size_varies = 0; 5038 5039 /* When the pointed-to type involves components of variable size, 5040 care must be taken to ensure that the size evaluation code is 5041 emitted early enough to dominate all the possible later uses 5042 and late enough for the variables on which it depends to have 5043 been assigned. 5044 5045 This is expected to happen automatically when the pointed-to 5046 type has a name/declaration of it's own, but special attention 5047 is required if the type is anonymous. 5048 5049 We handle the NORMAL and FIELD contexts here by attaching an 5050 artificial TYPE_DECL to such pointed-to type. This forces the 5051 sizes evaluation at a safe point and ensures it is not deferred 5052 until e.g. within a deeper conditional context. 5053 5054 We expect nothing to be needed here for PARM or TYPENAME. 5055 Pushing a TYPE_DECL at this point for TYPENAME would actually 5056 be incorrect, as we might be in the middle of an expression 5057 with side effects on the pointed-to type size "arguments" prior 5058 to the pointer declaration point and the fake TYPE_DECL in the 5059 enclosing context would force the size evaluation prior to the 5060 side effects. */ 5061 5062 if (!TYPE_NAME (type) 5063 && (decl_context == NORMAL || decl_context == FIELD) 5064 && variably_modified_type_p (type, NULL_TREE)) 5065 { 5066 tree decl = build_decl (TYPE_DECL, NULL_TREE, type); 5067 DECL_ARTIFICIAL (decl) = 1; 5068 pushdecl (decl); 5069 finish_decl (decl, NULL_TREE, NULL_TREE); 5070 TYPE_NAME (type) = decl; 5071 } 5072 5073 type = build_pointer_type (type); 5074 5075 /* Process type qualifiers (such as const or volatile) 5076 that were given inside the `*'. */ 5077 type_quals = declarator->u.pointer_quals; 5078 5079 declarator = declarator->declarator; 5080 break; 5081 } 5082 5083 5084 /* APPLE LOCAL begin radar 5732232 - blocks (C++ cj) */ 5085 case cdk_block_pointer: 5086 { 5087 if (TREE_CODE (type) != FUNCTION_TYPE) 5088 { 5089 error ("block pointer to non-function type is invalid"); 5090 type = error_mark_node; 5091 } 5092 else 5093 { 5094 type = build_block_pointer_type (type); 5095 /* APPLE LOCAL begin radar 5814025 (C++ cj) */ 5096 /* Process type qualifiers (such as const or volatile) 5097 that were given inside the `^'. */ 5098 type_quals = declarator->u.pointer_quals; 5099 /* APPLE LOCAL end radar 5814025 (C++ cj) */ 5100 declarator = declarator->declarator; 5101 } 5102 break; 5103 } 5104 /* APPLE LOCAL end radar 5732232 - blocks (C++ cj) */ 5105 5106 default: 5107 gcc_unreachable (); 5108 } 5109 } 5110 5111 /* Now TYPE has the actual type, apart from any qualifiers in 5112 TYPE_QUALS. */ 5113 5114 /* Check the type and width of a bit-field. */ 5115 if (bitfield) 5116 check_bitfield_type_and_width (&type, width, orig_name); 5117 5118 /* Did array size calculations overflow? */ 5119 5120 if (TREE_CODE (type) == ARRAY_TYPE 5121 && COMPLETE_TYPE_P (type) 5122 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST 5123 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type))) 5124 { 5125 error ("size of array %qs is too large", name); 5126 /* If we proceed with the array type as it is, we'll eventually 5127 crash in tree_low_cst(). */ 5128 type = error_mark_node; 5129 } 5130 5131 /* APPLE LOCAL begin blocks 6339747 */ 5132 if (decl_context == BLOCKDEF) 5133 { 5134 tree decl; 5135 5136 if (type == error_mark_node) 5137 return error_mark_node; 5138 5139 if (TREE_CODE (type) != FUNCTION_TYPE) 5140 { 5141 tree arg_types; 5142 5143 if (TREE_CODE (type) == ARRAY_TYPE) 5144 { 5145 error ("block declared as returning an array"); 5146 return error_mark_node; 5147 } 5148 5149 arg_info = XOBNEW (&parser_obstack, struct c_arg_info); 5150 arg_info->parms = 0; 5151 arg_info->tags = 0; 5152 arg_info->types = 0; 5153 arg_info->others = 0; 5154 arg_info->pending_sizes = 0; 5155 arg_info->had_vla_unspec = 0; 5156 arg_types = grokparms (arg_info, false); 5157 type_quals = TYPE_UNQUALIFIED; 5158 type = build_function_type (type, arg_types); 5159 } 5160 decl = build_decl (FUNCTION_DECL, NULL_TREE, type); 5161 DECL_ARGUMENTS (decl) = arg_info ? arg_info->parms : NULL_TREE; 5162 return decl; 5163 } 5164 /* APPLE LOCAL end blocks 6339747 */ 5165 5166 /* If this is declaring a typedef name, return a TYPE_DECL. */ 5167 5168 if (storage_class == csc_typedef) 5169 { 5170 tree decl; 5171 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE 5172 && type_quals) 5173 pedwarn ("ISO C forbids qualified function types"); 5174 if (type_quals) 5175 type = c_build_qualified_type (type, type_quals); 5176 decl = build_decl (TYPE_DECL, declarator->u.id, type); 5177 if (declspecs->explicit_signed_p) 5178 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1; 5179 decl_attributes (&decl, returned_attrs, 0); 5180 if (declspecs->inline_p) 5181 pedwarn ("typedef %q+D declared %<inline%>", decl); 5182 return decl; 5183 } 5184 5185 /* If this is a type name (such as, in a cast or sizeof), 5186 compute the type and return it now. */ 5187 5188 if (decl_context == TYPENAME) 5189 { 5190 /* Note that the grammar rejects storage classes in typenames 5191 and fields. */ 5192 gcc_assert (storage_class == csc_none && !threadp 5193 && !declspecs->inline_p); 5194 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE 5195 && type_quals) 5196 pedwarn ("ISO C forbids const or volatile function types"); 5197 if (type_quals) 5198 type = c_build_qualified_type (type, type_quals); 5199 decl_attributes (&type, returned_attrs, 0); 5200 return type; 5201 } 5202 5203 if (pedantic && decl_context == FIELD 5204 && variably_modified_type_p (type, NULL_TREE)) 5205 { 5206 /* C99 6.7.2.1p8 */ 5207 pedwarn ("a member of a structure or union cannot have a variably modified type"); 5208 } 5209 5210 /* Aside from typedefs and type names (handle above), 5211 `void' at top level (not within pointer) 5212 is allowed only in public variables. 5213 We don't complain about parms either, but that is because 5214 a better error message can be made later. */ 5215 5216 if (VOID_TYPE_P (type) && decl_context != PARM 5217 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE) 5218 && (storage_class == csc_extern 5219 || (current_scope == file_scope 5220 && !(storage_class == csc_static 5221 || storage_class == csc_register))))) 5222 { 5223 error ("variable or field %qs declared void", name); 5224 type = integer_type_node; 5225 } 5226 5227 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL 5228 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */ 5229 5230 { 5231 tree decl; 5232 5233 if (decl_context == PARM) 5234 { 5235 tree type_as_written; 5236 tree promoted_type; 5237 5238 /* A parameter declared as an array of T is really a pointer to T. 5239 One declared as a function is really a pointer to a function. */ 5240 5241 if (TREE_CODE (type) == ARRAY_TYPE) 5242 { 5243 /* Transfer const-ness of array into that of type pointed to. */ 5244 type = TREE_TYPE (type); 5245 if (type_quals) 5246 type = c_build_qualified_type (type, type_quals); 5247 type = build_pointer_type (type); 5248 type_quals = array_ptr_quals; 5249 5250 /* We don't yet implement attributes in this context. */ 5251 if (array_ptr_attrs != NULL_TREE) 5252 warning (OPT_Wattributes, 5253 "attributes in parameter array declarator ignored"); 5254 5255 size_varies = 0; 5256 } 5257 else if (TREE_CODE (type) == FUNCTION_TYPE) 5258 { 5259 if (pedantic && type_quals) 5260 pedwarn ("ISO C forbids qualified function types"); 5261 if (type_quals) 5262 type = c_build_qualified_type (type, type_quals); 5263 type = build_pointer_type (type); 5264 type_quals = TYPE_UNQUALIFIED; 5265 } 5266 else if (type_quals) 5267 type = c_build_qualified_type (type, type_quals); 5268 5269 type_as_written = type; 5270 5271 decl = build_decl (PARM_DECL, declarator->u.id, type); 5272 if (size_varies) 5273 C_DECL_VARIABLE_SIZE (decl) = 1; 5274 5275 /* Compute the type actually passed in the parmlist, 5276 for the case where there is no prototype. 5277 (For example, shorts and chars are passed as ints.) 5278 When there is a prototype, this is overridden later. */ 5279 5280 if (type == error_mark_node) 5281 promoted_type = type; 5282 else 5283 promoted_type = c_type_promotes_to (type); 5284 5285 DECL_ARG_TYPE (decl) = promoted_type; 5286 if (declspecs->inline_p) 5287 pedwarn ("parameter %q+D declared %<inline%>", decl); 5288 } 5289 else if (decl_context == FIELD) 5290 { 5291 /* Note that the grammar rejects storage classes in typenames 5292 and fields. */ 5293 gcc_assert (storage_class == csc_none && !threadp 5294 && !declspecs->inline_p); 5295 5296 /* Structure field. It may not be a function. */ 5297 5298 if (TREE_CODE (type) == FUNCTION_TYPE) 5299 { 5300 error ("field %qs declared as a function", name); 5301 type = build_pointer_type (type); 5302 } 5303 else if (TREE_CODE (type) != ERROR_MARK 5304 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type)) 5305 { 5306 error ("field %qs has incomplete type", name); 5307 type = error_mark_node; 5308 } 5309 type = c_build_qualified_type (type, type_quals); 5310 decl = build_decl (FIELD_DECL, declarator->u.id, type); 5311 DECL_NONADDRESSABLE_P (decl) = bitfield; 5312 5313 if (size_varies) 5314 C_DECL_VARIABLE_SIZE (decl) = 1; 5315 } 5316 else if (TREE_CODE (type) == FUNCTION_TYPE) 5317 { 5318 if (storage_class == csc_register || threadp) 5319 { 5320 error ("invalid storage class for function %qs", name); 5321 } 5322 else if (current_scope != file_scope) 5323 { 5324 /* Function declaration not at file scope. Storage 5325 classes other than `extern' are not allowed, C99 5326 6.7.1p5, and `extern' makes no difference. However, 5327 GCC allows 'auto', perhaps with 'inline', to support 5328 nested functions. */ 5329 if (storage_class == csc_auto) 5330 { 5331 if (pedantic) 5332 pedwarn ("invalid storage class for function %qs", name); 5333 } 5334 else if (storage_class == csc_static) 5335 { 5336 error ("invalid storage class for function %qs", name); 5337 if (funcdef_flag) 5338 storage_class = declspecs->storage_class = csc_none; 5339 else 5340 return 0; 5341 } 5342 } 5343 5344 decl = build_decl (FUNCTION_DECL, declarator->u.id, type); 5345 decl = build_decl_attribute_variant (decl, decl_attr); 5346 5347 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl); 5348 5349 if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl)) 5350 pedwarn ("ISO C forbids qualified function types"); 5351 5352 /* GNU C interprets a volatile-qualified function type to indicate 5353 that the function does not return. */ 5354 if ((type_quals & TYPE_QUAL_VOLATILE) 5355 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl)))) 5356 warning (0, "%<noreturn%> function returns non-void value"); 5357 5358 /* Every function declaration is an external reference 5359 (DECL_EXTERNAL) except for those which are not at file 5360 scope and are explicitly declared "auto". This is 5361 forbidden by standard C (C99 6.7.1p5) and is interpreted by 5362 GCC to signify a forward declaration of a nested function. */ 5363 if (storage_class == csc_auto && current_scope != file_scope) 5364 DECL_EXTERNAL (decl) = 0; 5365 /* In C99, a function which is declared 'inline' with 'extern' 5366 is not an external reference (which is confusing). It 5367 means that the later definition of the function must be output 5368 in this file, C99 6.7.4p6. In GNU C89, a function declared 5369 'extern inline' is an external reference. */ 5370 else if (declspecs->inline_p && storage_class != csc_static) 5371 DECL_EXTERNAL (decl) = ((storage_class == csc_extern) 5372 == flag_gnu89_inline); 5373 else 5374 DECL_EXTERNAL (decl) = !initialized; 5375 5376 /* Record absence of global scope for `static' or `auto'. */ 5377 TREE_PUBLIC (decl) 5378 = !(storage_class == csc_static || storage_class == csc_auto); 5379 5380 /* For a function definition, record the argument information 5381 block where store_parm_decls will look for it. */ 5382 if (funcdef_flag) 5383 current_function_arg_info = arg_info; 5384 5385 if (declspecs->default_int_p) 5386 C_FUNCTION_IMPLICIT_INT (decl) = 1; 5387 5388 /* Record presence of `inline', if it is reasonable. */ 5389 if (flag_hosted && MAIN_NAME_P (declarator->u.id)) 5390 { 5391 if (declspecs->inline_p) 5392 pedwarn ("cannot inline function %<main%>"); 5393 } 5394 else if (declspecs->inline_p) 5395 { 5396 /* Record that the function is declared `inline'. */ 5397 DECL_DECLARED_INLINE_P (decl) = 1; 5398 5399 /* Do not mark bare declarations as DECL_INLINE. Doing so 5400 in the presence of multiple declarations can result in 5401 the abstract origin pointing between the declarations, 5402 which will confuse dwarf2out. */ 5403 if (initialized) 5404 DECL_INLINE (decl) = 1; 5405 } 5406 /* If -finline-functions, assume it can be inlined. This does 5407 two things: let the function be deferred until it is actually 5408 needed, and let dwarf2 know that the function is inlinable. */ 5409 else if (flag_inline_trees == 2 && initialized) 5410 DECL_INLINE (decl) = 1; 5411 } 5412 else 5413 { 5414 /* It's a variable. */ 5415 /* An uninitialized decl with `extern' is a reference. */ 5416 int extern_ref = !initialized && storage_class == csc_extern; 5417 5418 type = c_build_qualified_type (type, type_quals); 5419 5420 /* C99 6.2.2p7: It is invalid (compile-time undefined 5421 behavior) to create an 'extern' declaration for a 5422 variable if there is a global declaration that is 5423 'static' and the global declaration is not visible. 5424 (If the static declaration _is_ currently visible, 5425 the 'extern' declaration is taken to refer to that decl.) */ 5426 if (extern_ref && current_scope != file_scope) 5427 { 5428 tree global_decl = identifier_global_value (declarator->u.id); 5429 tree visible_decl = lookup_name (declarator->u.id); 5430 5431 if (global_decl 5432 && global_decl != visible_decl 5433 && TREE_CODE (global_decl) == VAR_DECL 5434 && !TREE_PUBLIC (global_decl)) 5435 error ("variable previously declared %<static%> redeclared " 5436 "%<extern%>"); 5437 } 5438 5439 decl = build_decl (VAR_DECL, declarator->u.id, type); 5440 DECL_SOURCE_LOCATION (decl) = declarator->id_loc; 5441 if (size_varies) 5442 C_DECL_VARIABLE_SIZE (decl) = 1; 5443 5444 if (declspecs->inline_p) 5445 pedwarn ("variable %q+D declared %<inline%>", decl); 5446 5447 /* At file scope, an initialized extern declaration may follow 5448 a static declaration. In that case, DECL_EXTERNAL will be 5449 reset later in start_decl. */ 5450 DECL_EXTERNAL (decl) = (storage_class == csc_extern); 5451 5452 /* At file scope, the presence of a `static' or `register' storage 5453 class specifier, or the absence of all storage class specifiers 5454 makes this declaration a definition (perhaps tentative). Also, 5455 the absence of `static' makes it public. */ 5456 if (current_scope == file_scope) 5457 { 5458 TREE_PUBLIC (decl) = storage_class != csc_static; 5459 TREE_STATIC (decl) = !extern_ref; 5460 } 5461 /* Not at file scope, only `static' makes a static definition. */ 5462 else 5463 { 5464 TREE_STATIC (decl) = (storage_class == csc_static); 5465 TREE_PUBLIC (decl) = extern_ref; 5466 } 5467 5468 if (threadp) 5469 { 5470 if (targetm.have_tls) 5471 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl); 5472 else 5473 /* A mere warning is sure to result in improper semantics 5474 at runtime. Don't bother to allow this to compile. */ 5475 error ("thread-local storage not supported for this target"); 5476 } 5477 } 5478 5479 if (storage_class == csc_extern 5480 && variably_modified_type_p (type, NULL_TREE)) 5481 { 5482 /* C99 6.7.5.2p2 */ 5483 error ("object with variably modified type must have no linkage"); 5484 } 5485 5486 /* Record `register' declaration for warnings on & 5487 and in case doing stupid register allocation. */ 5488 5489 if (storage_class == csc_register) 5490 { 5491 C_DECL_REGISTER (decl) = 1; 5492 DECL_REGISTER (decl) = 1; 5493 } 5494 5495 /* Record constancy and volatility. */ 5496 c_apply_type_quals_to_decl (type_quals, decl); 5497 5498 /* If a type has volatile components, it should be stored in memory. 5499 Otherwise, the fact that those components are volatile 5500 will be ignored, and would even crash the compiler. 5501 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */ 5502 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)) 5503 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL 5504 || TREE_CODE (decl) == RESULT_DECL)) 5505 { 5506 /* It is not an error for a structure with volatile fields to 5507 be declared register, but reset DECL_REGISTER since it 5508 cannot actually go in a register. */ 5509 int was_reg = C_DECL_REGISTER (decl); 5510 C_DECL_REGISTER (decl) = 0; 5511 DECL_REGISTER (decl) = 0; 5512 c_mark_addressable (decl); 5513 C_DECL_REGISTER (decl) = was_reg; 5514 } 5515 5516 /* This is the earliest point at which we might know the assembler 5517 name of a variable. Thus, if it's known before this, die horribly. */ 5518 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl)); 5519 5520 decl_attributes (&decl, returned_attrs, 0); 5521 5522 return decl; 5523 } 5524} 5525 5526/* Decode the parameter-list info for a function type or function definition. 5527 The argument is the value returned by `get_parm_info' (or made in c-parse.c 5528 if there is an identifier list instead of a parameter decl list). 5529 These two functions are separate because when a function returns 5530 or receives functions then each is called multiple times but the order 5531 of calls is different. The last call to `grokparms' is always the one 5532 that contains the formal parameter names of a function definition. 5533 5534 Return a list of arg types to use in the FUNCTION_TYPE for this function. 5535 5536 FUNCDEF_FLAG is true for a function definition, false for 5537 a mere declaration. A nonempty identifier-list gets an error message 5538 when FUNCDEF_FLAG is false. */ 5539 5540static tree 5541grokparms (struct c_arg_info *arg_info, bool funcdef_flag) 5542{ 5543 tree arg_types = arg_info->types; 5544 5545 if (funcdef_flag && arg_info->had_vla_unspec) 5546 { 5547 /* A function definition isn't function prototype scope C99 6.2.1p4. */ 5548 /* C99 6.7.5.2p4 */ 5549 error ("%<[*]%> not allowed in other than function prototype scope"); 5550 } 5551 5552 if (arg_types == 0 && !funcdef_flag && !in_system_header) 5553 warning (OPT_Wstrict_prototypes, 5554 "function declaration isn%'t a prototype"); 5555 5556 if (arg_types == error_mark_node) 5557 return 0; /* don't set TYPE_ARG_TYPES in this case */ 5558 5559 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE) 5560 { 5561 if (!funcdef_flag) 5562 pedwarn ("parameter names (without types) in function declaration"); 5563 5564 arg_info->parms = arg_info->types; 5565 arg_info->types = 0; 5566 return 0; 5567 } 5568 else 5569 { 5570 tree parm, type, typelt; 5571 unsigned int parmno; 5572 5573 /* If there is a parameter of incomplete type in a definition, 5574 this is an error. In a declaration this is valid, and a 5575 struct or union type may be completed later, before any calls 5576 or definition of the function. In the case where the tag was 5577 first declared within the parameter list, a warning has 5578 already been given. If a parameter has void type, then 5579 however the function cannot be defined or called, so 5580 warn. */ 5581 5582 for (parm = arg_info->parms, typelt = arg_types, parmno = 1; 5583 parm; 5584 parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++) 5585 { 5586 type = TREE_VALUE (typelt); 5587 if (type == error_mark_node) 5588 continue; 5589 5590 if (!COMPLETE_TYPE_P (type)) 5591 { 5592 if (funcdef_flag) 5593 { 5594 if (DECL_NAME (parm)) 5595 error ("parameter %u (%q+D) has incomplete type", 5596 parmno, parm); 5597 else 5598 error ("%Jparameter %u has incomplete type", 5599 parm, parmno); 5600 5601 TREE_VALUE (typelt) = error_mark_node; 5602 TREE_TYPE (parm) = error_mark_node; 5603 } 5604 else if (VOID_TYPE_P (type)) 5605 { 5606 if (DECL_NAME (parm)) 5607 warning (0, "parameter %u (%q+D) has void type", 5608 parmno, parm); 5609 else 5610 warning (0, "%Jparameter %u has void type", 5611 parm, parmno); 5612 } 5613 } 5614 5615 if (DECL_NAME (parm) && TREE_USED (parm)) 5616 warn_if_shadowing (parm); 5617 } 5618 return arg_types; 5619 } 5620} 5621 5622/* Take apart the current scope and return a c_arg_info structure with 5623 info on a parameter list just parsed. 5624 5625 This structure is later fed to 'grokparms' and 'store_parm_decls'. 5626 5627 ELLIPSIS being true means the argument list ended in '...' so don't 5628 append a sentinel (void_list_node) to the end of the type-list. */ 5629 5630struct c_arg_info * 5631get_parm_info (bool ellipsis) 5632{ 5633 struct c_binding *b = current_scope->bindings; 5634 struct c_arg_info *arg_info = XOBNEW (&parser_obstack, 5635 struct c_arg_info); 5636 tree parms = 0; 5637 tree tags = 0; 5638 tree types = 0; 5639 tree others = 0; 5640 5641 static bool explained_incomplete_types = false; 5642 bool gave_void_only_once_err = false; 5643 5644 arg_info->parms = 0; 5645 arg_info->tags = 0; 5646 arg_info->types = 0; 5647 arg_info->others = 0; 5648 arg_info->pending_sizes = 0; 5649 arg_info->had_vla_unspec = current_scope->had_vla_unspec; 5650 5651 /* The bindings in this scope must not get put into a block. 5652 We will take care of deleting the binding nodes. */ 5653 current_scope->bindings = 0; 5654 5655 /* This function is only called if there was *something* on the 5656 parameter list. */ 5657 gcc_assert (b); 5658 5659 /* A parameter list consisting solely of 'void' indicates that the 5660 function takes no arguments. But if the 'void' is qualified 5661 (by 'const' or 'volatile'), or has a storage class specifier 5662 ('register'), then the behavior is undefined; issue an error. 5663 Typedefs for 'void' are OK (see DR#157). */ 5664 if (b->prev == 0 /* one binding */ 5665 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */ 5666 && !DECL_NAME (b->decl) /* anonymous */ 5667 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */ 5668 { 5669 if (TREE_THIS_VOLATILE (b->decl) 5670 || TREE_READONLY (b->decl) 5671 || C_DECL_REGISTER (b->decl)) 5672 error ("%<void%> as only parameter may not be qualified"); 5673 5674 /* There cannot be an ellipsis. */ 5675 if (ellipsis) 5676 error ("%<void%> must be the only parameter"); 5677 5678 arg_info->types = void_list_node; 5679 return arg_info; 5680 } 5681 5682 if (!ellipsis) 5683 types = void_list_node; 5684 5685 /* Break up the bindings list into parms, tags, types, and others; 5686 apply sanity checks; purge the name-to-decl bindings. */ 5687 while (b) 5688 { 5689 tree decl = b->decl; 5690 tree type = TREE_TYPE (decl); 5691 const char *keyword; 5692 5693 switch (TREE_CODE (decl)) 5694 { 5695 case PARM_DECL: 5696 if (b->id) 5697 { 5698 gcc_assert (I_SYMBOL_BINDING (b->id) == b); 5699 I_SYMBOL_BINDING (b->id) = b->shadowed; 5700 } 5701 5702 /* Check for forward decls that never got their actual decl. */ 5703 if (TREE_ASM_WRITTEN (decl)) 5704 error ("parameter %q+D has just a forward declaration", decl); 5705 /* Check for (..., void, ...) and issue an error. */ 5706 else if (VOID_TYPE_P (type) && !DECL_NAME (decl)) 5707 { 5708 if (!gave_void_only_once_err) 5709 { 5710 error ("%<void%> must be the only parameter"); 5711 gave_void_only_once_err = true; 5712 } 5713 } 5714 else 5715 { 5716 /* Valid parameter, add it to the list. */ 5717 TREE_CHAIN (decl) = parms; 5718 parms = decl; 5719 5720 /* Since there is a prototype, args are passed in their 5721 declared types. The back end may override this later. */ 5722 DECL_ARG_TYPE (decl) = type; 5723 types = tree_cons (0, type, types); 5724 } 5725 break; 5726 5727 case ENUMERAL_TYPE: keyword = "enum"; goto tag; 5728 case UNION_TYPE: keyword = "union"; goto tag; 5729 case RECORD_TYPE: keyword = "struct"; goto tag; 5730 tag: 5731 /* Types may not have tag-names, in which case the type 5732 appears in the bindings list with b->id NULL. */ 5733 if (b->id) 5734 { 5735 gcc_assert (I_TAG_BINDING (b->id) == b); 5736 I_TAG_BINDING (b->id) = b->shadowed; 5737 } 5738 5739 /* Warn about any struct, union or enum tags defined in a 5740 parameter list. The scope of such types is limited to 5741 the parameter list, which is rarely if ever desirable 5742 (it's impossible to call such a function with type- 5743 correct arguments). An anonymous union parm type is 5744 meaningful as a GNU extension, so don't warn for that. */ 5745 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0) 5746 { 5747 if (b->id) 5748 /* The %s will be one of 'struct', 'union', or 'enum'. */ 5749 warning (0, "%<%s %E%> declared inside parameter list", 5750 keyword, b->id); 5751 else 5752 /* The %s will be one of 'struct', 'union', or 'enum'. */ 5753 warning (0, "anonymous %s declared inside parameter list", 5754 keyword); 5755 5756 if (!explained_incomplete_types) 5757 { 5758 warning (0, "its scope is only this definition or declaration," 5759 " which is probably not what you want"); 5760 explained_incomplete_types = true; 5761 } 5762 } 5763 5764 tags = tree_cons (b->id, decl, tags); 5765 break; 5766 5767 case CONST_DECL: 5768 case TYPE_DECL: 5769 case FUNCTION_DECL: 5770 /* CONST_DECLs appear here when we have an embedded enum, 5771 and TYPE_DECLs appear here when we have an embedded struct 5772 or union. No warnings for this - we already warned about the 5773 type itself. FUNCTION_DECLs appear when there is an implicit 5774 function declaration in the parameter list. */ 5775 5776 TREE_CHAIN (decl) = others; 5777 others = decl; 5778 /* fall through */ 5779 5780 case ERROR_MARK: 5781 /* error_mark_node appears here when we have an undeclared 5782 variable. Just throw it away. */ 5783 if (b->id) 5784 { 5785 gcc_assert (I_SYMBOL_BINDING (b->id) == b); 5786 I_SYMBOL_BINDING (b->id) = b->shadowed; 5787 } 5788 break; 5789 5790 /* Other things that might be encountered. */ 5791 case LABEL_DECL: 5792 case VAR_DECL: 5793 default: 5794 gcc_unreachable (); 5795 } 5796 5797 b = free_binding_and_advance (b); 5798 } 5799 5800 arg_info->parms = parms; 5801 arg_info->tags = tags; 5802 arg_info->types = types; 5803 arg_info->others = others; 5804 arg_info->pending_sizes = get_pending_sizes (); 5805 return arg_info; 5806} 5807 5808/* Get the struct, enum or union (CODE says which) with tag NAME. 5809 Define the tag as a forward-reference if it is not defined. 5810 Return a c_typespec structure for the type specifier. */ 5811 5812struct c_typespec 5813parser_xref_tag (enum tree_code code, tree name) 5814{ 5815 struct c_typespec ret; 5816 /* If a cross reference is requested, look up the type 5817 already defined for this tag and return it. */ 5818 5819 tree ref = lookup_tag (code, name, 0); 5820 /* If this is the right type of tag, return what we found. 5821 (This reference will be shadowed by shadow_tag later if appropriate.) 5822 If this is the wrong type of tag, do not return it. If it was the 5823 wrong type in the same scope, we will have had an error 5824 message already; if in a different scope and declaring 5825 a name, pending_xref_error will give an error message; but if in a 5826 different scope and not declaring a name, this tag should 5827 shadow the previous declaration of a different type of tag, and 5828 this would not work properly if we return the reference found. 5829 (For example, with "struct foo" in an outer scope, "union foo;" 5830 must shadow that tag with a new one of union type.) */ 5831 ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref); 5832 if (ref && TREE_CODE (ref) == code) 5833 { 5834 ret.spec = ref; 5835 return ret; 5836 } 5837 5838 /* If no such tag is yet defined, create a forward-reference node 5839 and record it as the "definition". 5840 When a real declaration of this type is found, 5841 the forward-reference will be altered into a real type. */ 5842 5843 ref = make_node (code); 5844 if (code == ENUMERAL_TYPE) 5845 { 5846 /* Give the type a default layout like unsigned int 5847 to avoid crashing if it does not get defined. */ 5848 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node); 5849 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node); 5850 TYPE_USER_ALIGN (ref) = 0; 5851 TYPE_UNSIGNED (ref) = 1; 5852 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node); 5853 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node); 5854 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node); 5855 } 5856 5857 pushtag (name, ref); 5858 5859 ret.spec = ref; 5860 return ret; 5861} 5862 5863/* Get the struct, enum or union (CODE says which) with tag NAME. 5864 Define the tag as a forward-reference if it is not defined. 5865 Return a tree for the type. */ 5866 5867tree 5868xref_tag (enum tree_code code, tree name) 5869{ 5870 return parser_xref_tag (code, name).spec; 5871} 5872 5873/* Make sure that the tag NAME is defined *in the current scope* 5874 at least as a forward reference. 5875 CODE says which kind of tag NAME ought to be. */ 5876 5877tree 5878start_struct (enum tree_code code, tree name) 5879{ 5880 /* If there is already a tag defined at this scope 5881 (as a forward reference), just return it. */ 5882 5883 tree ref = 0; 5884 5885 if (name != 0) 5886 ref = lookup_tag (code, name, 1); 5887 if (ref && TREE_CODE (ref) == code) 5888 { 5889 if (TYPE_SIZE (ref)) 5890 { 5891 if (code == UNION_TYPE) 5892 error ("redefinition of %<union %E%>", name); 5893 else 5894 error ("redefinition of %<struct %E%>", name); 5895 } 5896 else if (C_TYPE_BEING_DEFINED (ref)) 5897 { 5898 if (code == UNION_TYPE) 5899 error ("nested redefinition of %<union %E%>", name); 5900 else 5901 error ("nested redefinition of %<struct %E%>", name); 5902 /* Don't create structures that contain themselves. */ 5903 ref = NULL_TREE; 5904 } 5905 } 5906 5907 /* Otherwise create a forward-reference just so the tag is in scope. */ 5908 5909 if (ref == NULL_TREE || TREE_CODE (ref) != code) 5910 { 5911 ref = make_node (code); 5912 pushtag (name, ref); 5913 } 5914 5915 C_TYPE_BEING_DEFINED (ref) = 1; 5916 TYPE_PACKED (ref) = flag_pack_struct; 5917 return ref; 5918} 5919 5920/* Process the specs, declarator and width (NULL if omitted) 5921 of a structure component, returning a FIELD_DECL node. 5922 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node. 5923 5924 This is done during the parsing of the struct declaration. 5925 The FIELD_DECL nodes are chained together and the lot of them 5926 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */ 5927 5928tree 5929grokfield (struct c_declarator *declarator, struct c_declspecs *declspecs, 5930 tree width) 5931{ 5932 tree value; 5933 5934 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE 5935 && width == NULL_TREE) 5936 { 5937 /* This is an unnamed decl. 5938 5939 If we have something of the form "union { list } ;" then this 5940 is the anonymous union extension. Similarly for struct. 5941 5942 If this is something of the form "struct foo;", then 5943 If MS extensions are enabled, this is handled as an 5944 anonymous struct. 5945 Otherwise this is a forward declaration of a structure tag. 5946 5947 If this is something of the form "foo;" and foo is a TYPE_DECL, then 5948 If MS extensions are enabled and foo names a structure, then 5949 again this is an anonymous struct. 5950 Otherwise this is an error. 5951 5952 Oh what a horrid tangled web we weave. I wonder if MS consciously 5953 took this from Plan 9 or if it was an accident of implementation 5954 that took root before someone noticed the bug... */ 5955 5956 tree type = declspecs->type; 5957 bool type_ok = (TREE_CODE (type) == RECORD_TYPE 5958 || TREE_CODE (type) == UNION_TYPE); 5959 bool ok = false; 5960 5961 if (type_ok 5962 && (flag_ms_extensions || !declspecs->typedef_p)) 5963 { 5964 if (flag_ms_extensions) 5965 ok = true; 5966 else if (flag_iso) 5967 ok = false; 5968 else if (TYPE_NAME (type) == NULL) 5969 ok = true; 5970 else 5971 ok = false; 5972 } 5973 if (!ok) 5974 { 5975 pedwarn ("declaration does not declare anything"); 5976 return NULL_TREE; 5977 } 5978 if (pedantic) 5979 pedwarn ("ISO C doesn%'t support unnamed structs/unions"); 5980 } 5981 5982 value = grokdeclarator (declarator, declspecs, FIELD, false, 5983 width ? &width : NULL); 5984 5985 finish_decl (value, NULL_TREE, NULL_TREE); 5986 DECL_INITIAL (value) = width; 5987 5988 return value; 5989} 5990 5991/* Generate an error for any duplicate field names in FIELDLIST. Munge 5992 the list such that this does not present a problem later. */ 5993 5994static void 5995detect_field_duplicates (tree fieldlist) 5996{ 5997 tree x, y; 5998 int timeout = 10; 5999 6000 /* First, see if there are more than "a few" fields. 6001 This is trivially true if there are zero or one fields. */ 6002 if (!fieldlist) 6003 return; 6004 x = TREE_CHAIN (fieldlist); 6005 if (!x) 6006 return; 6007 do { 6008 timeout--; 6009 x = TREE_CHAIN (x); 6010 } while (timeout > 0 && x); 6011 6012 /* If there were "few" fields, avoid the overhead of allocating 6013 a hash table. Instead just do the nested traversal thing. */ 6014 if (timeout > 0) 6015 { 6016 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x)) 6017 if (DECL_NAME (x)) 6018 { 6019 for (y = fieldlist; y != x; y = TREE_CHAIN (y)) 6020 if (DECL_NAME (y) == DECL_NAME (x)) 6021 { 6022 error ("duplicate member %q+D", x); 6023 DECL_NAME (x) = NULL_TREE; 6024 } 6025 } 6026 } 6027 else 6028 { 6029 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL); 6030 void **slot; 6031 6032 for (x = fieldlist; x ; x = TREE_CHAIN (x)) 6033 if ((y = DECL_NAME (x)) != 0) 6034 { 6035 slot = htab_find_slot (htab, y, INSERT); 6036 if (*slot) 6037 { 6038 error ("duplicate member %q+D", x); 6039 DECL_NAME (x) = NULL_TREE; 6040 } 6041 *slot = y; 6042 } 6043 6044 htab_delete (htab); 6045 } 6046} 6047 6048/* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T. 6049 FIELDLIST is a chain of FIELD_DECL nodes for the fields. 6050 ATTRIBUTES are attributes to be applied to the structure. */ 6051 6052tree 6053finish_struct (tree t, tree fieldlist, tree attributes) 6054{ 6055 tree x; 6056 bool toplevel = file_scope == current_scope; 6057 int saw_named_field; 6058 6059 /* If this type was previously laid out as a forward reference, 6060 make sure we lay it out again. */ 6061 6062 TYPE_SIZE (t) = 0; 6063 6064 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE); 6065 6066 if (pedantic) 6067 { 6068 for (x = fieldlist; x; x = TREE_CHAIN (x)) 6069 if (DECL_NAME (x) != 0) 6070 break; 6071 6072 if (x == 0) 6073 { 6074 if (TREE_CODE (t) == UNION_TYPE) 6075 { 6076 if (fieldlist) 6077 pedwarn ("union has no named members"); 6078 else 6079 pedwarn ("union has no members"); 6080 } 6081 else 6082 { 6083 if (fieldlist) 6084 pedwarn ("struct has no named members"); 6085 else 6086 pedwarn ("struct has no members"); 6087 } 6088 } 6089 } 6090 6091 /* Install struct as DECL_CONTEXT of each field decl. 6092 Also process specified field sizes, found in the DECL_INITIAL, 6093 storing 0 there after the type has been changed to precision equal 6094 to its width, rather than the precision of the specified standard 6095 type. (Correct layout requires the original type to have been preserved 6096 until now.) */ 6097 6098 saw_named_field = 0; 6099 for (x = fieldlist; x; x = TREE_CHAIN (x)) 6100 { 6101 if (TREE_TYPE (x) == error_mark_node) 6102 continue; 6103 6104 DECL_CONTEXT (x) = t; 6105 6106 if (TYPE_PACKED (t) && TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT) 6107 DECL_PACKED (x) = 1; 6108 6109 /* If any field is const, the structure type is pseudo-const. */ 6110 if (TREE_READONLY (x)) 6111 C_TYPE_FIELDS_READONLY (t) = 1; 6112 else 6113 { 6114 /* A field that is pseudo-const makes the structure likewise. */ 6115 tree t1 = TREE_TYPE (x); 6116 while (TREE_CODE (t1) == ARRAY_TYPE) 6117 t1 = TREE_TYPE (t1); 6118 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE) 6119 && C_TYPE_FIELDS_READONLY (t1)) 6120 C_TYPE_FIELDS_READONLY (t) = 1; 6121 } 6122 6123 /* Any field that is volatile means variables of this type must be 6124 treated in some ways as volatile. */ 6125 if (TREE_THIS_VOLATILE (x)) 6126 C_TYPE_FIELDS_VOLATILE (t) = 1; 6127 6128 /* Any field of nominal variable size implies structure is too. */ 6129 if (C_DECL_VARIABLE_SIZE (x)) 6130 C_TYPE_VARIABLE_SIZE (t) = 1; 6131 6132 if (DECL_INITIAL (x)) 6133 { 6134 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1); 6135 DECL_SIZE (x) = bitsize_int (width); 6136 DECL_BIT_FIELD (x) = 1; 6137 SET_DECL_C_BIT_FIELD (x); 6138 } 6139 6140 /* Detect flexible array member in an invalid context. */ 6141 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE 6142 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE 6143 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE 6144 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE) 6145 { 6146 if (TREE_CODE (t) == UNION_TYPE) 6147 { 6148 error ("%Jflexible array member in union", x); 6149 TREE_TYPE (x) = error_mark_node; 6150 } 6151 else if (TREE_CHAIN (x) != NULL_TREE) 6152 { 6153 error ("%Jflexible array member not at end of struct", x); 6154 TREE_TYPE (x) = error_mark_node; 6155 } 6156 else if (!saw_named_field) 6157 { 6158 error ("%Jflexible array member in otherwise empty struct", x); 6159 TREE_TYPE (x) = error_mark_node; 6160 } 6161 } 6162 6163 if (pedantic && !in_system_header && TREE_CODE (t) == RECORD_TYPE 6164 && flexible_array_type_p (TREE_TYPE (x))) 6165 pedwarn ("%Jinvalid use of structure with flexible array member", x); 6166 6167 if (DECL_NAME (x)) 6168 saw_named_field = 1; 6169 } 6170 6171 detect_field_duplicates (fieldlist); 6172 6173 /* Now we have the nearly final fieldlist. Record it, 6174 then lay out the structure or union (including the fields). */ 6175 6176 TYPE_FIELDS (t) = fieldlist; 6177 6178 layout_type (t); 6179 6180 /* Give bit-fields their proper types. */ 6181 { 6182 tree *fieldlistp = &fieldlist; 6183 while (*fieldlistp) 6184 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp) 6185 && TREE_TYPE (*fieldlistp) != error_mark_node) 6186 { 6187 unsigned HOST_WIDE_INT width 6188 = tree_low_cst (DECL_INITIAL (*fieldlistp), 1); 6189 tree type = TREE_TYPE (*fieldlistp); 6190 if (width != TYPE_PRECISION (type)) 6191 { 6192 TREE_TYPE (*fieldlistp) 6193 = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type)); 6194 DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp)); 6195 } 6196 DECL_INITIAL (*fieldlistp) = 0; 6197 } 6198 else 6199 fieldlistp = &TREE_CHAIN (*fieldlistp); 6200 } 6201 6202 /* Now we have the truly final field list. 6203 Store it in this type and in the variants. */ 6204 6205 TYPE_FIELDS (t) = fieldlist; 6206 6207 /* If there are lots of fields, sort so we can look through them fast. 6208 We arbitrarily consider 16 or more elts to be "a lot". */ 6209 6210 { 6211 int len = 0; 6212 6213 for (x = fieldlist; x; x = TREE_CHAIN (x)) 6214 { 6215 if (len > 15 || DECL_NAME (x) == NULL) 6216 break; 6217 len += 1; 6218 } 6219 6220 if (len > 15) 6221 { 6222 tree *field_array; 6223 struct lang_type *space; 6224 struct sorted_fields_type *space2; 6225 6226 len += list_length (x); 6227 6228 /* Use the same allocation policy here that make_node uses, to 6229 ensure that this lives as long as the rest of the struct decl. 6230 All decls in an inline function need to be saved. */ 6231 6232 space = GGC_CNEW (struct lang_type); 6233 space2 = GGC_NEWVAR (struct sorted_fields_type, 6234 sizeof (struct sorted_fields_type) + len * sizeof (tree)); 6235 6236 len = 0; 6237 space->s = space2; 6238 field_array = &space2->elts[0]; 6239 for (x = fieldlist; x; x = TREE_CHAIN (x)) 6240 { 6241 field_array[len++] = x; 6242 6243 /* If there is anonymous struct or union, break out of the loop. */ 6244 if (DECL_NAME (x) == NULL) 6245 break; 6246 } 6247 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */ 6248 if (x == NULL) 6249 { 6250 TYPE_LANG_SPECIFIC (t) = space; 6251 TYPE_LANG_SPECIFIC (t)->s->len = len; 6252 field_array = TYPE_LANG_SPECIFIC (t)->s->elts; 6253 qsort (field_array, len, sizeof (tree), field_decl_cmp); 6254 } 6255 } 6256 } 6257 6258 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x)) 6259 { 6260 TYPE_FIELDS (x) = TYPE_FIELDS (t); 6261 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t); 6262 C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t); 6263 C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t); 6264 C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t); 6265 } 6266 6267 /* If this was supposed to be a transparent union, but we can't 6268 make it one, warn and turn off the flag. */ 6269 if (TREE_CODE (t) == UNION_TYPE 6270 && TYPE_TRANSPARENT_UNION (t) 6271 && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))) 6272 { 6273 TYPE_TRANSPARENT_UNION (t) = 0; 6274 warning (0, "union cannot be made transparent"); 6275 } 6276 6277 /* If this structure or union completes the type of any previous 6278 variable declaration, lay it out and output its rtl. */ 6279 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)); 6280 x; 6281 x = TREE_CHAIN (x)) 6282 { 6283 tree decl = TREE_VALUE (x); 6284 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE) 6285 layout_array_type (TREE_TYPE (decl)); 6286 if (TREE_CODE (decl) != TYPE_DECL) 6287 { 6288 layout_decl (decl, 0); 6289 if (c_dialect_objc ()) 6290 objc_check_decl (decl); 6291 rest_of_decl_compilation (decl, toplevel, 0); 6292 if (!toplevel) 6293 expand_decl (decl); 6294 } 6295 } 6296 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0; 6297 6298 /* Finish debugging output for this type. */ 6299 rest_of_type_compilation (t, toplevel); 6300 6301 /* If we're inside a function proper, i.e. not file-scope and not still 6302 parsing parameters, then arrange for the size of a variable sized type 6303 to be bound now. */ 6304 if (cur_stmt_list && variably_modified_type_p (t, NULL_TREE)) 6305 add_stmt (build_stmt (DECL_EXPR, build_decl (TYPE_DECL, NULL, t))); 6306 6307 return t; 6308} 6309 6310/* Lay out the type T, and its element type, and so on. */ 6311 6312static void 6313layout_array_type (tree t) 6314{ 6315 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE) 6316 layout_array_type (TREE_TYPE (t)); 6317 layout_type (t); 6318} 6319 6320/* Begin compiling the definition of an enumeration type. 6321 NAME is its name (or null if anonymous). 6322 Returns the type object, as yet incomplete. 6323 Also records info about it so that build_enumerator 6324 may be used to declare the individual values as they are read. */ 6325 6326tree 6327start_enum (tree name) 6328{ 6329 tree enumtype = 0; 6330 6331 /* If this is the real definition for a previous forward reference, 6332 fill in the contents in the same object that used to be the 6333 forward reference. */ 6334 6335 if (name != 0) 6336 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1); 6337 6338 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE) 6339 { 6340 enumtype = make_node (ENUMERAL_TYPE); 6341 pushtag (name, enumtype); 6342 } 6343 6344 if (C_TYPE_BEING_DEFINED (enumtype)) 6345 error ("nested redefinition of %<enum %E%>", name); 6346 6347 C_TYPE_BEING_DEFINED (enumtype) = 1; 6348 6349 if (TYPE_VALUES (enumtype) != 0) 6350 { 6351 /* This enum is a named one that has been declared already. */ 6352 error ("redeclaration of %<enum %E%>", name); 6353 6354 /* Completely replace its old definition. 6355 The old enumerators remain defined, however. */ 6356 TYPE_VALUES (enumtype) = 0; 6357 } 6358 6359 enum_next_value = integer_zero_node; 6360 enum_overflow = 0; 6361 6362 if (flag_short_enums) 6363 TYPE_PACKED (enumtype) = 1; 6364 6365 return enumtype; 6366} 6367 6368/* After processing and defining all the values of an enumeration type, 6369 install their decls in the enumeration type and finish it off. 6370 ENUMTYPE is the type object, VALUES a list of decl-value pairs, 6371 and ATTRIBUTES are the specified attributes. 6372 Returns ENUMTYPE. */ 6373 6374tree 6375finish_enum (tree enumtype, tree values, tree attributes) 6376{ 6377 tree pair, tem; 6378 tree minnode = 0, maxnode = 0; 6379 int precision, unsign; 6380 bool toplevel = (file_scope == current_scope); 6381 struct lang_type *lt; 6382 6383 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE); 6384 6385 /* Calculate the maximum value of any enumerator in this type. */ 6386 6387 if (values == error_mark_node) 6388 minnode = maxnode = integer_zero_node; 6389 else 6390 { 6391 minnode = maxnode = TREE_VALUE (values); 6392 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair)) 6393 { 6394 tree value = TREE_VALUE (pair); 6395 if (tree_int_cst_lt (maxnode, value)) 6396 maxnode = value; 6397 if (tree_int_cst_lt (value, minnode)) 6398 minnode = value; 6399 } 6400 } 6401 6402 /* Construct the final type of this enumeration. It is the same 6403 as one of the integral types - the narrowest one that fits, except 6404 that normally we only go as narrow as int - and signed iff any of 6405 the values are negative. */ 6406 unsign = (tree_int_cst_sgn (minnode) >= 0); 6407 precision = MAX (min_precision (minnode, unsign), 6408 min_precision (maxnode, unsign)); 6409 6410 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node)) 6411 { 6412 tem = c_common_type_for_size (precision, unsign); 6413 if (tem == NULL) 6414 { 6415 warning (0, "enumeration values exceed range of largest integer"); 6416 tem = long_long_integer_type_node; 6417 } 6418 } 6419 else 6420 tem = unsign ? unsigned_type_node : integer_type_node; 6421 6422 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem); 6423 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem); 6424 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem); 6425 TYPE_SIZE (enumtype) = 0; 6426 6427 /* If the precision of the type was specific with an attribute and it 6428 was too small, give an error. Otherwise, use it. */ 6429 if (TYPE_PRECISION (enumtype)) 6430 { 6431 if (precision > TYPE_PRECISION (enumtype)) 6432 error ("specified mode too small for enumeral values"); 6433 } 6434 else 6435 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem); 6436 6437 layout_type (enumtype); 6438 6439 if (values != error_mark_node) 6440 { 6441 /* Change the type of the enumerators to be the enum type. We 6442 need to do this irrespective of the size of the enum, for 6443 proper type checking. Replace the DECL_INITIALs of the 6444 enumerators, and the value slots of the list, with copies 6445 that have the enum type; they cannot be modified in place 6446 because they may be shared (e.g. integer_zero_node) Finally, 6447 change the purpose slots to point to the names of the decls. */ 6448 for (pair = values; pair; pair = TREE_CHAIN (pair)) 6449 { 6450 tree enu = TREE_PURPOSE (pair); 6451 tree ini = DECL_INITIAL (enu); 6452 6453 TREE_TYPE (enu) = enumtype; 6454 6455 /* The ISO C Standard mandates enumerators to have type int, 6456 even though the underlying type of an enum type is 6457 unspecified. Here we convert any enumerators that fit in 6458 an int to type int, to avoid promotions to unsigned types 6459 when comparing integers with enumerators that fit in the 6460 int range. When -pedantic is given, build_enumerator() 6461 would have already taken care of those that don't fit. */ 6462 if (int_fits_type_p (ini, integer_type_node)) 6463 tem = integer_type_node; 6464 else 6465 tem = enumtype; 6466 ini = convert (tem, ini); 6467 6468 DECL_INITIAL (enu) = ini; 6469 TREE_PURPOSE (pair) = DECL_NAME (enu); 6470 TREE_VALUE (pair) = ini; 6471 } 6472 6473 TYPE_VALUES (enumtype) = values; 6474 } 6475 6476 /* Record the min/max values so that we can warn about bit-field 6477 enumerations that are too small for the values. */ 6478 lt = GGC_CNEW (struct lang_type); 6479 lt->enum_min = minnode; 6480 lt->enum_max = maxnode; 6481 TYPE_LANG_SPECIFIC (enumtype) = lt; 6482 6483 /* Fix up all variant types of this enum type. */ 6484 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem)) 6485 { 6486 if (tem == enumtype) 6487 continue; 6488 TYPE_VALUES (tem) = TYPE_VALUES (enumtype); 6489 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype); 6490 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype); 6491 TYPE_SIZE (tem) = TYPE_SIZE (enumtype); 6492 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype); 6493 TYPE_MODE (tem) = TYPE_MODE (enumtype); 6494 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype); 6495 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype); 6496 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype); 6497 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype); 6498 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype); 6499 } 6500 6501 /* Finish debugging output for this type. */ 6502 rest_of_type_compilation (enumtype, toplevel); 6503 6504 return enumtype; 6505} 6506 6507/* Build and install a CONST_DECL for one value of the 6508 current enumeration type (one that was begun with start_enum). 6509 Return a tree-list containing the CONST_DECL and its value. 6510 Assignment of sequential values by default is handled here. */ 6511 6512tree 6513build_enumerator (tree name, tree value) 6514{ 6515 tree decl, type; 6516 6517 /* Validate and default VALUE. */ 6518 6519 if (value != 0) 6520 { 6521 /* Don't issue more errors for error_mark_node (i.e. an 6522 undeclared identifier) - just ignore the value expression. */ 6523 if (value == error_mark_node) 6524 value = 0; 6525 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value)) 6526 || TREE_CODE (value) != INTEGER_CST) 6527 { 6528 error ("enumerator value for %qE is not an integer constant", name); 6529 value = 0; 6530 } 6531 else 6532 { 6533 value = default_conversion (value); 6534 constant_expression_warning (value); 6535 } 6536 } 6537 6538 /* Default based on previous value. */ 6539 /* It should no longer be possible to have NON_LVALUE_EXPR 6540 in the default. */ 6541 if (value == 0) 6542 { 6543 value = enum_next_value; 6544 if (enum_overflow) 6545 error ("overflow in enumeration values"); 6546 } 6547 6548 if (pedantic && !int_fits_type_p (value, integer_type_node)) 6549 { 6550 pedwarn ("ISO C restricts enumerator values to range of %<int%>"); 6551 /* XXX This causes -pedantic to change the meaning of the program. 6552 Remove? -zw 2004-03-15 */ 6553 value = convert (integer_type_node, value); 6554 } 6555 6556 /* Set basis for default for next value. */ 6557 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0); 6558 enum_overflow = tree_int_cst_lt (enum_next_value, value); 6559 6560 /* Now create a declaration for the enum value name. */ 6561 6562 type = TREE_TYPE (value); 6563 type = c_common_type_for_size (MAX (TYPE_PRECISION (type), 6564 TYPE_PRECISION (integer_type_node)), 6565 (TYPE_PRECISION (type) 6566 >= TYPE_PRECISION (integer_type_node) 6567 && TYPE_UNSIGNED (type))); 6568 6569 decl = build_decl (CONST_DECL, name, type); 6570 DECL_INITIAL (decl) = convert (type, value); 6571 pushdecl (decl); 6572 6573 return tree_cons (decl, value, NULL_TREE); 6574} 6575 6576 6577/* Create the FUNCTION_DECL for a function definition. 6578 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of 6579 the declaration; they describe the function's name and the type it returns, 6580 but twisted together in a fashion that parallels the syntax of C. 6581 6582 This function creates a binding context for the function body 6583 as well as setting up the FUNCTION_DECL in current_function_decl. 6584 6585 Returns 1 on success. If the DECLARATOR is not suitable for a function 6586 (it defines a datum instead), we return 0, which tells 6587 yyparse to report a parse error. */ 6588 6589int 6590start_function (struct c_declspecs *declspecs, struct c_declarator *declarator, 6591 tree attributes) 6592{ 6593 tree decl1, old_decl; 6594 tree restype, resdecl; 6595 struct c_label_context_se *nstack_se; 6596 struct c_label_context_vm *nstack_vm; 6597 6598 current_function_returns_value = 0; /* Assume, until we see it does. */ 6599 current_function_returns_null = 0; 6600 current_function_returns_abnormally = 0; 6601 warn_about_return_type = 0; 6602 c_switch_stack = NULL; 6603 6604 nstack_se = XOBNEW (&parser_obstack, struct c_label_context_se); 6605 nstack_se->labels_def = NULL; 6606 nstack_se->labels_used = NULL; 6607 nstack_se->next = label_context_stack_se; 6608 label_context_stack_se = nstack_se; 6609 6610 nstack_vm = XOBNEW (&parser_obstack, struct c_label_context_vm); 6611 nstack_vm->labels_def = NULL; 6612 nstack_vm->labels_used = NULL; 6613 nstack_vm->scope = 0; 6614 nstack_vm->next = label_context_stack_vm; 6615 label_context_stack_vm = nstack_vm; 6616 6617 /* Indicate no valid break/continue context by setting these variables 6618 to some non-null, non-label value. We'll notice and emit the proper 6619 error message in c_finish_bc_stmt. */ 6620 c_break_label = c_cont_label = size_zero_node; 6621 6622 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL); 6623 6624 /* If the declarator is not suitable for a function definition, 6625 cause a syntax error. */ 6626 if (decl1 == 0) 6627 { 6628 label_context_stack_se = label_context_stack_se->next; 6629 label_context_stack_vm = label_context_stack_vm->next; 6630 return 0; 6631 } 6632 6633 decl_attributes (&decl1, attributes, 0); 6634 6635 if (DECL_DECLARED_INLINE_P (decl1) 6636 && DECL_UNINLINABLE (decl1) 6637 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1))) 6638 warning (OPT_Wattributes, "inline function %q+D given attribute noinline", 6639 decl1); 6640 6641 /* Handle gnu_inline attribute. */ 6642 if (declspecs->inline_p 6643 && !flag_gnu89_inline 6644 && TREE_CODE (decl1) == FUNCTION_DECL 6645 && lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1))) 6646 { 6647 if (declspecs->storage_class != csc_static) 6648 DECL_EXTERNAL (decl1) = !DECL_EXTERNAL (decl1); 6649 } 6650 6651 announce_function (decl1); 6652 6653 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1)))) 6654 { 6655 error ("return type is an incomplete type"); 6656 /* Make it return void instead. */ 6657 TREE_TYPE (decl1) 6658 = build_function_type (void_type_node, 6659 TYPE_ARG_TYPES (TREE_TYPE (decl1))); 6660 } 6661 6662 if (warn_about_return_type) 6663 pedwarn_c99 ("return type defaults to %<int%>"); 6664 6665 /* Make the init_value nonzero so pushdecl knows this is not tentative. 6666 error_mark_node is replaced below (in pop_scope) with the BLOCK. */ 6667 DECL_INITIAL (decl1) = error_mark_node; 6668 6669 /* If this definition isn't a prototype and we had a prototype declaration 6670 before, copy the arg type info from that prototype. */ 6671 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope); 6672 if (old_decl && TREE_CODE (old_decl) != FUNCTION_DECL) 6673 old_decl = 0; 6674 current_function_prototype_locus = UNKNOWN_LOCATION; 6675 current_function_prototype_built_in = false; 6676 current_function_prototype_arg_types = NULL_TREE; 6677 if (TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0) 6678 { 6679 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE 6680 && comptypes (TREE_TYPE (TREE_TYPE (decl1)), 6681 TREE_TYPE (TREE_TYPE (old_decl)))) 6682 { 6683 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl), 6684 TREE_TYPE (decl1)); 6685 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl); 6686 current_function_prototype_built_in 6687 = C_DECL_BUILTIN_PROTOTYPE (old_decl); 6688 current_function_prototype_arg_types 6689 = TYPE_ARG_TYPES (TREE_TYPE (decl1)); 6690 } 6691 if (TREE_PUBLIC (decl1)) 6692 { 6693 /* If there is an external prototype declaration of this 6694 function, record its location but do not copy information 6695 to this decl. This may be an invisible declaration 6696 (built-in or in a scope which has finished) or simply 6697 have more refined argument types than any declaration 6698 found above. */ 6699 struct c_binding *b; 6700 for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed) 6701 if (B_IN_SCOPE (b, external_scope)) 6702 break; 6703 if (b) 6704 { 6705 tree ext_decl, ext_type; 6706 ext_decl = b->decl; 6707 ext_type = b->type ? b->type : TREE_TYPE (ext_decl); 6708 if (TREE_CODE (ext_type) == FUNCTION_TYPE 6709 && comptypes (TREE_TYPE (TREE_TYPE (decl1)), 6710 TREE_TYPE (ext_type))) 6711 { 6712 current_function_prototype_locus 6713 = DECL_SOURCE_LOCATION (ext_decl); 6714 current_function_prototype_built_in 6715 = C_DECL_BUILTIN_PROTOTYPE (ext_decl); 6716 current_function_prototype_arg_types 6717 = TYPE_ARG_TYPES (ext_type); 6718 } 6719 } 6720 } 6721 } 6722 6723 /* Optionally warn of old-fashioned def with no previous prototype. */ 6724 if (warn_strict_prototypes 6725 && old_decl != error_mark_node 6726 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0 6727 && C_DECL_ISNT_PROTOTYPE (old_decl)) 6728 warning (OPT_Wstrict_prototypes, 6729 "function declaration isn%'t a prototype"); 6730 /* Optionally warn of any global def with no previous prototype. */ 6731 else if (warn_missing_prototypes 6732 && old_decl != error_mark_node 6733 && TREE_PUBLIC (decl1) 6734 && !MAIN_NAME_P (DECL_NAME (decl1)) 6735 && C_DECL_ISNT_PROTOTYPE (old_decl)) 6736 warning (OPT_Wmissing_prototypes, "no previous prototype for %q+D", decl1); 6737 /* Optionally warn of any def with no previous prototype 6738 if the function has already been used. */ 6739 else if (warn_missing_prototypes 6740 && old_decl != 0 6741 && old_decl != error_mark_node 6742 && TREE_USED (old_decl) 6743 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0) 6744 warning (OPT_Wmissing_prototypes, 6745 "%q+D was used with no prototype before its definition", decl1); 6746 /* Optionally warn of any global def with no previous declaration. */ 6747 else if (warn_missing_declarations 6748 && TREE_PUBLIC (decl1) 6749 && old_decl == 0 6750 && !MAIN_NAME_P (DECL_NAME (decl1))) 6751 warning (OPT_Wmissing_declarations, "no previous declaration for %q+D", 6752 decl1); 6753 /* Optionally warn of any def with no previous declaration 6754 if the function has already been used. */ 6755 else if (warn_missing_declarations 6756 && old_decl != 0 6757 && old_decl != error_mark_node 6758 && TREE_USED (old_decl) 6759 && C_DECL_IMPLICIT (old_decl)) 6760 warning (OPT_Wmissing_declarations, 6761 "%q+D was used with no declaration before its definition", decl1); 6762 6763 /* This function exists in static storage. 6764 (This does not mean `static' in the C sense!) */ 6765 TREE_STATIC (decl1) = 1; 6766 6767 /* A nested function is not global. */ 6768 if (current_function_decl != 0) 6769 TREE_PUBLIC (decl1) = 0; 6770 6771 /* This is the earliest point at which we might know the assembler 6772 name of the function. Thus, if it's set before this, die horribly. */ 6773 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1)); 6774 6775 /* If #pragma weak was used, mark the decl weak now. */ 6776 if (current_scope == file_scope) 6777 maybe_apply_pragma_weak (decl1); 6778 6779 /* Warn for unlikely, improbable, or stupid declarations of `main'. */ 6780 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1))) 6781 { 6782 tree args; 6783 int argct = 0; 6784 6785 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1))) 6786 != integer_type_node) 6787 pedwarn ("return type of %q+D is not %<int%>", decl1); 6788 6789 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args; 6790 args = TREE_CHAIN (args)) 6791 { 6792 tree type = args ? TREE_VALUE (args) : 0; 6793 6794 if (type == void_type_node) 6795 break; 6796 6797 ++argct; 6798 switch (argct) 6799 { 6800 case 1: 6801 if (TYPE_MAIN_VARIANT (type) != integer_type_node) 6802 pedwarn ("first argument of %q+D should be %<int%>", decl1); 6803 break; 6804 6805 case 2: 6806 if (TREE_CODE (type) != POINTER_TYPE 6807 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE 6808 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type))) 6809 != char_type_node)) 6810 pedwarn ("second argument of %q+D should be %<char **%>", 6811 decl1); 6812 break; 6813 6814 case 3: 6815 if (TREE_CODE (type) != POINTER_TYPE 6816 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE 6817 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type))) 6818 != char_type_node)) 6819 pedwarn ("third argument of %q+D should probably be " 6820 "%<char **%>", decl1); 6821 break; 6822 } 6823 } 6824 6825 /* It is intentional that this message does not mention the third 6826 argument because it's only mentioned in an appendix of the 6827 standard. */ 6828 if (argct > 0 && (argct < 2 || argct > 3)) 6829 pedwarn ("%q+D takes only zero or two arguments", decl1); 6830 6831 if (!TREE_PUBLIC (decl1)) 6832 pedwarn ("%q+D is normally a non-static function", decl1); 6833 } 6834 6835 /* Record the decl so that the function name is defined. 6836 If we already have a decl for this name, and it is a FUNCTION_DECL, 6837 use the old decl. */ 6838 6839 current_function_decl = pushdecl (decl1); 6840 6841 push_scope (); 6842 declare_parm_level (); 6843 6844 restype = TREE_TYPE (TREE_TYPE (current_function_decl)); 6845 /* Promote the value to int before returning it. */ 6846 if (c_promoting_integer_type_p (restype)) 6847 { 6848 /* It retains unsignedness if not really getting wider. */ 6849 if (TYPE_UNSIGNED (restype) 6850 && (TYPE_PRECISION (restype) 6851 == TYPE_PRECISION (integer_type_node))) 6852 restype = unsigned_type_node; 6853 else 6854 restype = integer_type_node; 6855 } 6856 6857 resdecl = build_decl (RESULT_DECL, NULL_TREE, restype); 6858 DECL_ARTIFICIAL (resdecl) = 1; 6859 DECL_IGNORED_P (resdecl) = 1; 6860 DECL_RESULT (current_function_decl) = resdecl; 6861 6862 start_fname_decls (); 6863 6864 return 1; 6865} 6866 6867/* Subroutine of store_parm_decls which handles new-style function 6868 definitions (prototype format). The parms already have decls, so we 6869 need only record them as in effect and complain if any redundant 6870 old-style parm decls were written. */ 6871static void 6872store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info) 6873{ 6874 tree decl; 6875 6876 if (current_scope->bindings) 6877 { 6878 error ("%Jold-style parameter declarations in prototyped " 6879 "function definition", fndecl); 6880 6881 /* Get rid of the old-style declarations. */ 6882 pop_scope (); 6883 push_scope (); 6884 } 6885 /* Don't issue this warning for nested functions, and don't issue this 6886 warning if we got here because ARG_INFO_TYPES was error_mark_node 6887 (this happens when a function definition has just an ellipsis in 6888 its parameter list). */ 6889 else if (!in_system_header && !current_function_scope 6890 && arg_info->types != error_mark_node) 6891 warning (OPT_Wtraditional, 6892 "%Jtraditional C rejects ISO C style function definitions", 6893 fndecl); 6894 6895 /* Now make all the parameter declarations visible in the function body. 6896 We can bypass most of the grunt work of pushdecl. */ 6897 for (decl = arg_info->parms; decl; decl = TREE_CHAIN (decl)) 6898 { 6899 DECL_CONTEXT (decl) = current_function_decl; 6900 if (DECL_NAME (decl)) 6901 { 6902 bind (DECL_NAME (decl), decl, current_scope, 6903 /*invisible=*/false, /*nested=*/false); 6904 if (!TREE_USED (decl)) 6905 warn_if_shadowing (decl); 6906 } 6907 else 6908 error ("%Jparameter name omitted", decl); 6909 } 6910 6911 /* Record the parameter list in the function declaration. */ 6912 DECL_ARGUMENTS (fndecl) = arg_info->parms; 6913 6914 /* Now make all the ancillary declarations visible, likewise. */ 6915 for (decl = arg_info->others; decl; decl = TREE_CHAIN (decl)) 6916 { 6917 DECL_CONTEXT (decl) = current_function_decl; 6918 if (DECL_NAME (decl)) 6919 bind (DECL_NAME (decl), decl, current_scope, 6920 /*invisible=*/false, /*nested=*/false); 6921 } 6922 6923 /* And all the tag declarations. */ 6924 for (decl = arg_info->tags; decl; decl = TREE_CHAIN (decl)) 6925 if (TREE_PURPOSE (decl)) 6926 bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope, 6927 /*invisible=*/false, /*nested=*/false); 6928} 6929 6930/* Subroutine of store_parm_decls which handles old-style function 6931 definitions (separate parameter list and declarations). */ 6932 6933static void 6934store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info) 6935{ 6936 struct c_binding *b; 6937 tree parm, decl, last; 6938 tree parmids = arg_info->parms; 6939 struct pointer_set_t *seen_args = pointer_set_create (); 6940 6941 if (!in_system_header) 6942 warning (OPT_Wold_style_definition, "%Jold-style function definition", 6943 fndecl); 6944 6945 /* Match each formal parameter name with its declaration. Save each 6946 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */ 6947 for (parm = parmids; parm; parm = TREE_CHAIN (parm)) 6948 { 6949 if (TREE_VALUE (parm) == 0) 6950 { 6951 error ("%Jparameter name missing from parameter list", fndecl); 6952 TREE_PURPOSE (parm) = 0; 6953 continue; 6954 } 6955 6956 b = I_SYMBOL_BINDING (TREE_VALUE (parm)); 6957 if (b && B_IN_CURRENT_SCOPE (b)) 6958 { 6959 decl = b->decl; 6960 /* If we got something other than a PARM_DECL it is an error. */ 6961 if (TREE_CODE (decl) != PARM_DECL) 6962 error ("%q+D declared as a non-parameter", decl); 6963 /* If the declaration is already marked, we have a duplicate 6964 name. Complain and ignore the duplicate. */ 6965 else if (pointer_set_contains (seen_args, decl)) 6966 { 6967 error ("multiple parameters named %q+D", decl); 6968 TREE_PURPOSE (parm) = 0; 6969 continue; 6970 } 6971 /* If the declaration says "void", complain and turn it into 6972 an int. */ 6973 else if (VOID_TYPE_P (TREE_TYPE (decl))) 6974 { 6975 error ("parameter %q+D declared with void type", decl); 6976 TREE_TYPE (decl) = integer_type_node; 6977 DECL_ARG_TYPE (decl) = integer_type_node; 6978 layout_decl (decl, 0); 6979 } 6980 warn_if_shadowing (decl); 6981 } 6982 /* If no declaration found, default to int. */ 6983 else 6984 { 6985 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node); 6986 DECL_ARG_TYPE (decl) = TREE_TYPE (decl); 6987 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl); 6988 pushdecl (decl); 6989 warn_if_shadowing (decl); 6990 6991 if (flag_isoc99) 6992 pedwarn ("type of %q+D defaults to %<int%>", decl); 6993 else if (extra_warnings) 6994 warning (OPT_Wextra, "type of %q+D defaults to %<int%>", decl); 6995 } 6996 6997 TREE_PURPOSE (parm) = decl; 6998 pointer_set_insert (seen_args, decl); 6999 } 7000 7001 /* Now examine the parms chain for incomplete declarations 7002 and declarations with no corresponding names. */ 7003 7004 for (b = current_scope->bindings; b; b = b->prev) 7005 { 7006 parm = b->decl; 7007 if (TREE_CODE (parm) != PARM_DECL) 7008 continue; 7009 7010 if (TREE_TYPE (parm) != error_mark_node 7011 && !COMPLETE_TYPE_P (TREE_TYPE (parm))) 7012 { 7013 error ("parameter %q+D has incomplete type", parm); 7014 TREE_TYPE (parm) = error_mark_node; 7015 } 7016 7017 if (!pointer_set_contains (seen_args, parm)) 7018 { 7019 error ("declaration for parameter %q+D but no such parameter", parm); 7020 7021 /* Pretend the parameter was not missing. 7022 This gets us to a standard state and minimizes 7023 further error messages. */ 7024 parmids = chainon (parmids, tree_cons (parm, 0, 0)); 7025 } 7026 } 7027 7028 /* Chain the declarations together in the order of the list of 7029 names. Store that chain in the function decl, replacing the 7030 list of names. Update the current scope to match. */ 7031 DECL_ARGUMENTS (fndecl) = 0; 7032 7033 for (parm = parmids; parm; parm = TREE_CHAIN (parm)) 7034 if (TREE_PURPOSE (parm)) 7035 break; 7036 if (parm && TREE_PURPOSE (parm)) 7037 { 7038 last = TREE_PURPOSE (parm); 7039 DECL_ARGUMENTS (fndecl) = last; 7040 7041 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm)) 7042 if (TREE_PURPOSE (parm)) 7043 { 7044 TREE_CHAIN (last) = TREE_PURPOSE (parm); 7045 last = TREE_PURPOSE (parm); 7046 } 7047 TREE_CHAIN (last) = 0; 7048 } 7049 7050 pointer_set_destroy (seen_args); 7051 7052 /* If there was a previous prototype, 7053 set the DECL_ARG_TYPE of each argument according to 7054 the type previously specified, and report any mismatches. */ 7055 7056 if (current_function_prototype_arg_types) 7057 { 7058 tree type; 7059 for (parm = DECL_ARGUMENTS (fndecl), 7060 type = current_function_prototype_arg_types; 7061 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type)) 7062 != void_type_node)); 7063 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type)) 7064 { 7065 if (parm == 0 || type == 0 7066 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node) 7067 { 7068 if (current_function_prototype_built_in) 7069 warning (0, "number of arguments doesn%'t match " 7070 "built-in prototype"); 7071 else 7072 { 7073 error ("number of arguments doesn%'t match prototype"); 7074 error ("%Hprototype declaration", 7075 ¤t_function_prototype_locus); 7076 } 7077 break; 7078 } 7079 /* Type for passing arg must be consistent with that 7080 declared for the arg. ISO C says we take the unqualified 7081 type for parameters declared with qualified type. */ 7082 if (!comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)), 7083 TYPE_MAIN_VARIANT (TREE_VALUE (type)))) 7084 { 7085 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) 7086 == TYPE_MAIN_VARIANT (TREE_VALUE (type))) 7087 { 7088 /* Adjust argument to match prototype. E.g. a previous 7089 `int foo(float);' prototype causes 7090 `int foo(x) float x; {...}' to be treated like 7091 `int foo(float x) {...}'. This is particularly 7092 useful for argument types like uid_t. */ 7093 DECL_ARG_TYPE (parm) = TREE_TYPE (parm); 7094 7095 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl)) 7096 && INTEGRAL_TYPE_P (TREE_TYPE (parm)) 7097 && TYPE_PRECISION (TREE_TYPE (parm)) 7098 < TYPE_PRECISION (integer_type_node)) 7099 DECL_ARG_TYPE (parm) = integer_type_node; 7100 7101 if (pedantic) 7102 { 7103 /* ??? Is it possible to get here with a 7104 built-in prototype or will it always have 7105 been diagnosed as conflicting with an 7106 old-style definition and discarded? */ 7107 if (current_function_prototype_built_in) 7108 warning (0, "promoted argument %qD " 7109 "doesn%'t match built-in prototype", parm); 7110 else 7111 { 7112 pedwarn ("promoted argument %qD " 7113 "doesn%'t match prototype", parm); 7114 pedwarn ("%Hprototype declaration", 7115 ¤t_function_prototype_locus); 7116 } 7117 } 7118 } 7119 else 7120 { 7121 if (current_function_prototype_built_in) 7122 warning (0, "argument %qD doesn%'t match " 7123 "built-in prototype", parm); 7124 else 7125 { 7126 error ("argument %qD doesn%'t match prototype", parm); 7127 error ("%Hprototype declaration", 7128 ¤t_function_prototype_locus); 7129 } 7130 } 7131 } 7132 } 7133 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0; 7134 } 7135 7136 /* Otherwise, create a prototype that would match. */ 7137 7138 else 7139 { 7140 tree actual = 0, last = 0, type; 7141 7142 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm)) 7143 { 7144 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE); 7145 if (last) 7146 TREE_CHAIN (last) = type; 7147 else 7148 actual = type; 7149 last = type; 7150 } 7151 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE); 7152 if (last) 7153 TREE_CHAIN (last) = type; 7154 else 7155 actual = type; 7156 7157 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES 7158 of the type of this function, but we need to avoid having this 7159 affect the types of other similarly-typed functions, so we must 7160 first force the generation of an identical (but separate) type 7161 node for the relevant function type. The new node we create 7162 will be a variant of the main variant of the original function 7163 type. */ 7164 7165 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl)); 7166 7167 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual; 7168 } 7169} 7170 7171/* Store parameter declarations passed in ARG_INFO into the current 7172 function declaration. */ 7173 7174void 7175store_parm_decls_from (struct c_arg_info *arg_info) 7176{ 7177 current_function_arg_info = arg_info; 7178 store_parm_decls (); 7179} 7180 7181/* Store the parameter declarations into the current function declaration. 7182 This is called after parsing the parameter declarations, before 7183 digesting the body of the function. 7184 7185 For an old-style definition, construct a prototype out of the old-style 7186 parameter declarations and inject it into the function's type. */ 7187 7188void 7189store_parm_decls (void) 7190{ 7191 tree fndecl = current_function_decl; 7192 bool proto; 7193 7194 /* The argument information block for FNDECL. */ 7195 struct c_arg_info *arg_info = current_function_arg_info; 7196 current_function_arg_info = 0; 7197 7198 /* True if this definition is written with a prototype. Note: 7199 despite C99 6.7.5.3p14, we can *not* treat an empty argument 7200 list in a function definition as equivalent to (void) -- an 7201 empty argument list specifies the function has no parameters, 7202 but only (void) sets up a prototype for future calls. */ 7203 proto = arg_info->types != 0; 7204 7205 if (proto) 7206 store_parm_decls_newstyle (fndecl, arg_info); 7207 else 7208 store_parm_decls_oldstyle (fndecl, arg_info); 7209 7210 /* The next call to push_scope will be a function body. */ 7211 7212 next_is_function_body = true; 7213 7214 /* Write a record describing this function definition to the prototypes 7215 file (if requested). */ 7216 7217 gen_aux_info_record (fndecl, 1, 0, proto); 7218 7219 /* Initialize the RTL code for the function. */ 7220 allocate_struct_function (fndecl); 7221 7222 /* Begin the statement tree for this function. */ 7223 DECL_SAVED_TREE (fndecl) = push_stmt_list (); 7224 7225 /* ??? Insert the contents of the pending sizes list into the function 7226 to be evaluated. The only reason left to have this is 7227 void foo(int n, int array[n++]) 7228 because we throw away the array type in favor of a pointer type, and 7229 thus won't naturally see the SAVE_EXPR containing the increment. All 7230 other pending sizes would be handled by gimplify_parameters. */ 7231 { 7232 tree t; 7233 for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t)) 7234 add_stmt (TREE_VALUE (t)); 7235 } 7236 7237 /* Even though we're inside a function body, we still don't want to 7238 call expand_expr to calculate the size of a variable-sized array. 7239 We haven't necessarily assigned RTL to all variables yet, so it's 7240 not safe to try to expand expressions involving them. */ 7241 cfun->x_dont_save_pending_sizes_p = 1; 7242} 7243 7244/* Emit diagnostics that require gimple input for detection. Operate on 7245 FNDECL and all its nested functions. */ 7246 7247static void 7248c_gimple_diagnostics_recursively (tree fndecl) 7249{ 7250 struct cgraph_node *cgn; 7251 7252 /* Handle attribute((warn_unused_result)). Relies on gimple input. */ 7253 c_warn_unused_result (&DECL_SAVED_TREE (fndecl)); 7254 7255 /* Notice when OpenMP structured block constraints are violated. */ 7256 if (flag_openmp) 7257 diagnose_omp_structured_block_errors (fndecl); 7258 7259 /* Finalize all nested functions now. */ 7260 cgn = cgraph_node (fndecl); 7261 for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested) 7262 c_gimple_diagnostics_recursively (cgn->decl); 7263} 7264 7265/* Finish up a function declaration and compile that function 7266 all the way to assembler language output. The free the storage 7267 for the function definition. 7268 7269 This is called after parsing the body of the function definition. */ 7270 7271void 7272finish_function (void) 7273{ 7274 tree fndecl = current_function_decl; 7275 7276 label_context_stack_se = label_context_stack_se->next; 7277 label_context_stack_vm = label_context_stack_vm->next; 7278 7279 if (TREE_CODE (fndecl) == FUNCTION_DECL 7280 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl))) 7281 { 7282 tree args = DECL_ARGUMENTS (fndecl); 7283 for (; args; args = TREE_CHAIN (args)) 7284 { 7285 tree type = TREE_TYPE (args); 7286 if (INTEGRAL_TYPE_P (type) 7287 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node)) 7288 DECL_ARG_TYPE (args) = integer_type_node; 7289 } 7290 } 7291 7292 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node) 7293 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl; 7294 7295 /* Must mark the RESULT_DECL as being in this function. */ 7296 7297 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node) 7298 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl; 7299 7300 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted) 7301 { 7302 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) 7303 != integer_type_node) 7304 { 7305 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned. 7306 If warn_main is -1 (-Wno-main) we don't want to be warned. */ 7307 if (!warn_main) 7308 pedwarn ("return type of %q+D is not %<int%>", fndecl); 7309 } 7310 else 7311 { 7312 if (flag_isoc99) 7313 { 7314 tree stmt = c_finish_return (integer_zero_node); 7315#ifdef USE_MAPPED_LOCATION 7316 /* Hack. We don't want the middle-end to warn that this return 7317 is unreachable, so we mark its location as special. Using 7318 UNKNOWN_LOCATION has the problem that it gets clobbered in 7319 annotate_one_with_locus. A cleaner solution might be to 7320 ensure ! should_carry_locus_p (stmt), but that needs a flag. 7321 */ 7322 SET_EXPR_LOCATION (stmt, BUILTINS_LOCATION); 7323#else 7324 /* Hack. We don't want the middle-end to warn that this 7325 return is unreachable, so put the statement on the 7326 special line 0. */ 7327 annotate_with_file_line (stmt, input_filename, 0); 7328#endif 7329 } 7330 } 7331 } 7332 7333 /* Tie off the statement tree for this function. */ 7334 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl)); 7335 7336 finish_fname_decls (); 7337 7338 /* Complain if there's just no return statement. */ 7339 if (warn_return_type 7340 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE 7341 && !current_function_returns_value && !current_function_returns_null 7342 /* Don't complain if we are no-return. */ 7343 && !current_function_returns_abnormally 7344 /* Don't warn for main(). */ 7345 && !MAIN_NAME_P (DECL_NAME (fndecl)) 7346 /* Or if they didn't actually specify a return type. */ 7347 && !C_FUNCTION_IMPLICIT_INT (fndecl) 7348 /* Normally, with -Wreturn-type, flow will complain. Unless we're an 7349 inline function, as we might never be compiled separately. */ 7350 && DECL_INLINE (fndecl)) 7351 { 7352 warning (OPT_Wreturn_type, 7353 "no return statement in function returning non-void"); 7354 TREE_NO_WARNING (fndecl) = 1; 7355 } 7356 7357 /* With just -Wextra, complain only if function returns both with 7358 and without a value. */ 7359 if (extra_warnings 7360 && current_function_returns_value 7361 && current_function_returns_null) 7362 warning (OPT_Wextra, "this function may return with or without a value"); 7363 7364 /* Store the end of the function, so that we get good line number 7365 info for the epilogue. */ 7366 cfun->function_end_locus = input_location; 7367 7368 /* If we don't have ctors/dtors sections, and this is a static 7369 constructor or destructor, it must be recorded now. */ 7370 if (DECL_STATIC_CONSTRUCTOR (fndecl) 7371 && !targetm.have_ctors_dtors) 7372 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors); 7373 if (DECL_STATIC_DESTRUCTOR (fndecl) 7374 && !targetm.have_ctors_dtors) 7375 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors); 7376 7377 /* Finalize the ELF visibility for the function. */ 7378 c_determine_visibility (fndecl); 7379 7380 /* Genericize before inlining. Delay genericizing nested functions 7381 until their parent function is genericized. Since finalizing 7382 requires GENERIC, delay that as well. */ 7383 7384 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node 7385 && !undef_nested_function) 7386 { 7387 if (!decl_function_context (fndecl)) 7388 { 7389 c_genericize (fndecl); 7390 c_gimple_diagnostics_recursively (fndecl); 7391 7392 /* ??? Objc emits functions after finalizing the compilation unit. 7393 This should be cleaned up later and this conditional removed. */ 7394 if (cgraph_global_info_ready) 7395 { 7396 c_expand_body (fndecl); 7397 return; 7398 } 7399 7400 cgraph_finalize_function (fndecl, false); 7401 } 7402 else 7403 { 7404 /* Register this function with cgraph just far enough to get it 7405 added to our parent's nested function list. Handy, since the 7406 C front end doesn't have such a list. */ 7407 (void) cgraph_node (fndecl); 7408 } 7409 } 7410 7411 if (!decl_function_context (fndecl)) 7412 undef_nested_function = false; 7413 7414 /* We're leaving the context of this function, so zap cfun. 7415 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in 7416 tree_rest_of_compilation. */ 7417 cfun = NULL; 7418 current_function_decl = NULL; 7419} 7420 7421/* Generate the RTL for the body of FNDECL. */ 7422 7423void 7424c_expand_body (tree fndecl) 7425{ 7426 7427 if (!DECL_INITIAL (fndecl) 7428 || DECL_INITIAL (fndecl) == error_mark_node) 7429 return; 7430 7431 tree_rest_of_compilation (fndecl); 7432 7433 if (DECL_STATIC_CONSTRUCTOR (fndecl) 7434 && targetm.have_ctors_dtors) 7435 targetm.asm_out.constructor (XEXP (DECL_RTL (fndecl), 0), 7436 DEFAULT_INIT_PRIORITY); 7437 if (DECL_STATIC_DESTRUCTOR (fndecl) 7438 && targetm.have_ctors_dtors) 7439 targetm.asm_out.destructor (XEXP (DECL_RTL (fndecl), 0), 7440 DEFAULT_INIT_PRIORITY); 7441} 7442 7443/* Check the declarations given in a for-loop for satisfying the C99 7444 constraints. If exactly one such decl is found, return it. */ 7445 7446tree 7447check_for_loop_decls (void) 7448{ 7449 struct c_binding *b; 7450 tree one_decl = NULL_TREE; 7451 int n_decls = 0; 7452 7453 7454 if (!flag_isoc99) 7455 { 7456 /* If we get here, declarations have been used in a for loop without 7457 the C99 for loop scope. This doesn't make much sense, so don't 7458 allow it. */ 7459 error ("%<for%> loop initial declaration used outside C99 mode"); 7460 return NULL_TREE; 7461 } 7462 /* C99 subclause 6.8.5 paragraph 3: 7463 7464 [#3] The declaration part of a for statement shall only 7465 declare identifiers for objects having storage class auto or 7466 register. 7467 7468 It isn't clear whether, in this sentence, "identifiers" binds to 7469 "shall only declare" or to "objects" - that is, whether all identifiers 7470 declared must be identifiers for objects, or whether the restriction 7471 only applies to those that are. (A question on this in comp.std.c 7472 in November 2000 received no answer.) We implement the strictest 7473 interpretation, to avoid creating an extension which later causes 7474 problems. */ 7475 7476 for (b = current_scope->bindings; b; b = b->prev) 7477 { 7478 tree id = b->id; 7479 tree decl = b->decl; 7480 7481 if (!id) 7482 continue; 7483 7484 switch (TREE_CODE (decl)) 7485 { 7486 case VAR_DECL: 7487 if (TREE_STATIC (decl)) 7488 error ("declaration of static variable %q+D in %<for%> loop " 7489 "initial declaration", decl); 7490 else if (DECL_EXTERNAL (decl)) 7491 error ("declaration of %<extern%> variable %q+D in %<for%> loop " 7492 "initial declaration", decl); 7493 break; 7494 7495 case RECORD_TYPE: 7496 error ("%<struct %E%> declared in %<for%> loop initial declaration", 7497 id); 7498 break; 7499 case UNION_TYPE: 7500 error ("%<union %E%> declared in %<for%> loop initial declaration", 7501 id); 7502 break; 7503 case ENUMERAL_TYPE: 7504 error ("%<enum %E%> declared in %<for%> loop initial declaration", 7505 id); 7506 break; 7507 /* APPLE LOCAL begin radar 6268817 */ 7508 case FUNCTION_DECL: 7509 /* Block helper function can be declared in the statement block 7510 for the for-loop declarations. */ 7511 if (BLOCK_SYNTHESIZED_FUNC (decl)) 7512 break; 7513 /* APPLE LOCAL end radar 6268817 */ 7514 default: 7515 error ("declaration of non-variable %q+D in %<for%> loop " 7516 "initial declaration", decl); 7517 } 7518 7519 n_decls++; 7520 one_decl = decl; 7521 } 7522 7523 return n_decls == 1 ? one_decl : NULL_TREE; 7524} 7525 7526/* Save and reinitialize the variables 7527 used during compilation of a C function. */ 7528 7529void 7530c_push_function_context (struct function *f) 7531{ 7532 struct language_function *p; 7533 p = GGC_NEW (struct language_function); 7534 f->language = p; 7535 7536 p->base.x_stmt_tree = c_stmt_tree; 7537 p->x_break_label = c_break_label; 7538 p->x_cont_label = c_cont_label; 7539 p->x_switch_stack = c_switch_stack; 7540 p->arg_info = current_function_arg_info; 7541 p->returns_value = current_function_returns_value; 7542 p->returns_null = current_function_returns_null; 7543 p->returns_abnormally = current_function_returns_abnormally; 7544 p->warn_about_return_type = warn_about_return_type; 7545} 7546 7547/* Restore the variables used during compilation of a C function. */ 7548 7549void 7550c_pop_function_context (struct function *f) 7551{ 7552 struct language_function *p = f->language; 7553 7554 /* APPLE LOCAL begin blocks 6040305 */ 7555 if (current_function_decl 7556 && DECL_STRUCT_FUNCTION (current_function_decl) == 0 7557 /* APPLE LOCAL end blocks 6040305 */ 7558 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE) 7559 { 7560 /* Stop pointing to the local nodes about to be freed. */ 7561 /* But DECL_INITIAL must remain nonzero so we know this 7562 was an actual function definition. */ 7563 DECL_INITIAL (current_function_decl) = error_mark_node; 7564 DECL_ARGUMENTS (current_function_decl) = 0; 7565 } 7566 7567 c_stmt_tree = p->base.x_stmt_tree; 7568 c_break_label = p->x_break_label; 7569 c_cont_label = p->x_cont_label; 7570 c_switch_stack = p->x_switch_stack; 7571 current_function_arg_info = p->arg_info; 7572 current_function_returns_value = p->returns_value; 7573 current_function_returns_null = p->returns_null; 7574 current_function_returns_abnormally = p->returns_abnormally; 7575 warn_about_return_type = p->warn_about_return_type; 7576 7577 f->language = NULL; 7578} 7579 7580/* Copy the DECL_LANG_SPECIFIC data associated with DECL. */ 7581 7582void 7583c_dup_lang_specific_decl (tree decl) 7584{ 7585 struct lang_decl *ld; 7586 7587 if (!DECL_LANG_SPECIFIC (decl)) 7588 return; 7589 7590 ld = GGC_NEW (struct lang_decl); 7591 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl)); 7592 DECL_LANG_SPECIFIC (decl) = ld; 7593} 7594 7595/* The functions below are required for functionality of doing 7596 function at once processing in the C front end. Currently these 7597 functions are not called from anywhere in the C front end, but as 7598 these changes continue, that will change. */ 7599 7600/* Returns the stmt_tree (if any) to which statements are currently 7601 being added. If there is no active statement-tree, NULL is 7602 returned. */ 7603 7604stmt_tree 7605current_stmt_tree (void) 7606{ 7607 return &c_stmt_tree; 7608} 7609 7610/* Nonzero if TYPE is an anonymous union or struct type. Always 0 in 7611 C. */ 7612 7613int 7614anon_aggr_type_p (tree ARG_UNUSED (node)) 7615{ 7616 return 0; 7617} 7618 7619/* Return the global value of T as a symbol. */ 7620 7621tree 7622identifier_global_value (tree t) 7623{ 7624 struct c_binding *b; 7625 7626 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed) 7627 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b)) 7628 return b->decl; 7629 7630 return 0; 7631} 7632 7633/* Record a builtin type for C. If NAME is non-NULL, it is the name used; 7634 otherwise the name is found in ridpointers from RID_INDEX. */ 7635 7636void 7637record_builtin_type (enum rid rid_index, const char *name, tree type) 7638{ 7639 tree id, decl; 7640 if (name == 0) 7641 id = ridpointers[(int) rid_index]; 7642 else 7643 id = get_identifier (name); 7644 decl = build_decl (TYPE_DECL, id, type); 7645 pushdecl (decl); 7646 if (debug_hooks->type_decl) 7647 debug_hooks->type_decl (decl, false); 7648} 7649 7650/* Build the void_list_node (void_type_node having been created). */ 7651tree 7652build_void_list_node (void) 7653{ 7654 tree t = build_tree_list (NULL_TREE, void_type_node); 7655 return t; 7656} 7657 7658/* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */ 7659 7660struct c_parm * 7661build_c_parm (struct c_declspecs *specs, tree attrs, 7662 struct c_declarator *declarator) 7663{ 7664 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm); 7665 ret->specs = specs; 7666 ret->attrs = attrs; 7667 ret->declarator = declarator; 7668 return ret; 7669} 7670 7671/* Return a declarator with nested attributes. TARGET is the inner 7672 declarator to which these attributes apply. ATTRS are the 7673 attributes. */ 7674 7675struct c_declarator * 7676build_attrs_declarator (tree attrs, struct c_declarator *target) 7677{ 7678 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator); 7679 ret->kind = cdk_attrs; 7680 ret->declarator = target; 7681 ret->u.attrs = attrs; 7682 return ret; 7683} 7684 7685/* Return a declarator for a function with arguments specified by ARGS 7686 and return type specified by TARGET. */ 7687 7688struct c_declarator * 7689build_function_declarator (struct c_arg_info *args, 7690 struct c_declarator *target) 7691{ 7692 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator); 7693 ret->kind = cdk_function; 7694 ret->declarator = target; 7695 ret->u.arg_info = args; 7696 return ret; 7697} 7698 7699/* Return a declarator for the identifier IDENT (which may be 7700 NULL_TREE for an abstract declarator). */ 7701 7702struct c_declarator * 7703build_id_declarator (tree ident) 7704{ 7705 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator); 7706 ret->kind = cdk_id; 7707 ret->declarator = 0; 7708 ret->u.id = ident; 7709 /* Default value - may get reset to a more precise location. */ 7710 ret->id_loc = input_location; 7711 return ret; 7712} 7713 7714/* Return something to represent absolute declarators containing a *. 7715 TARGET is the absolute declarator that the * contains. 7716 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes 7717 to apply to the pointer type. */ 7718 7719struct c_declarator * 7720make_pointer_declarator (struct c_declspecs *type_quals_attrs, 7721 struct c_declarator *target) 7722{ 7723 tree attrs; 7724 int quals = 0; 7725 struct c_declarator *itarget = target; 7726 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator); 7727 if (type_quals_attrs) 7728 { 7729 attrs = type_quals_attrs->attrs; 7730 quals = quals_from_declspecs (type_quals_attrs); 7731 if (attrs != NULL_TREE) 7732 itarget = build_attrs_declarator (attrs, target); 7733 } 7734 ret->kind = cdk_pointer; 7735 ret->declarator = itarget; 7736 ret->u.pointer_quals = quals; 7737 return ret; 7738} 7739 7740/* APPLE LOCAL begin radar 5932809 - copyable byref blocks (C++ ch) */ 7741/* build_byref_local_var_access - converts EXPR to: 7742 EXPR.__forwarding-><decl-name>. 7743*/ 7744tree 7745build_byref_local_var_access (tree expr, tree decl_name) 7746{ 7747 tree exp = build_component_ref (expr, get_identifier ("__forwarding")); 7748 exp = build_indirect_ref (exp, "unary *"); 7749 exp = build_component_ref (exp, decl_name); 7750 return exp; 7751} 7752/* APPLE LOCAL end radar 5932809 - copyable byref blocks (C++ ch) */ 7753/* APPLE LOCAL begin radar 5732232 - blocks (C++ ch) */ 7754/** 7755 build_block_byref_decl - This routine inserts a variable declared as a 7756 'byref' variable using the |...| syntax in helper function's outer-most scope. 7757*/ 7758tree 7759build_block_byref_decl (tree name, tree decl, tree exp) 7760{ 7761 struct c_scope *scope = current_scope; 7762 tree ptr_type, byref_decl; 7763 /* APPLE LOCAL begin radar 6225809 */ 7764 if (cur_block->prev_block_info) { 7765 /* Traverse enclosing blocks. Insert a __block variable in 7766 each enclosing block which has no declaration of this 7767 variable. This is to ensure that the current (inner) block 7768 gets the __block version of the variable; */ 7769 struct block_sema_info *cb = cur_block->prev_block_info; 7770 while (cb) { 7771 struct c_binding *b = I_SYMBOL_BINDING (name); 7772 /* Find the first declaration not in current block. */ 7773 while (b && b->decl 7774 && (TREE_CODE (b->decl) == VAR_DECL 7775 || TREE_CODE (b->decl) == PARM_DECL) 7776 && b->depth >= cur_block->the_scope->depth) 7777 b = b->shadowed; 7778 7779 /* Is the next declaration not in enclosing block? */ 7780 if (b && b->decl 7781 && (TREE_CODE (b->decl) == VAR_DECL 7782 || TREE_CODE (b->decl) == PARM_DECL) 7783 && b->depth < cb->the_scope->depth) { 7784 /* No declaration of variable seen in the block. Must insert one. */ 7785 struct c_scope *save_scope = current_scope; 7786 struct block_sema_info *save_current_block = cur_block; 7787 current_scope = cb->the_scope; 7788 cur_block = cb; 7789 decl = build_block_byref_decl (name, decl, exp); 7790 cur_block = save_current_block; 7791 current_scope = save_scope; 7792 } 7793 cb = cb->prev_block_info; 7794 } 7795 } 7796 /* APPLE LOCAL end radar 6225809 */ 7797 7798 /* If it is already a byref declaration, do not add the pointer type 7799 because such declarations already have the pointer type 7800 added. This happens when we have two nested byref declarations in 7801 nested blocks. */ 7802 ptr_type = (TREE_CODE (decl) == VAR_DECL && BLOCK_DECL_BYREF (decl)) 7803 ? TREE_TYPE (decl) : build_pointer_type (TREE_TYPE (decl)); 7804 byref_decl = build_decl (VAR_DECL, name, ptr_type); 7805 /* APPLE LOCAL begin radars 6144664 & 6145471 */ 7806 DECL_SOURCE_LOCATION (byref_decl) = DECL_SOURCE_LOCATION 7807 (cur_block->helper_func_decl); 7808 /* APPLE LOCAL end radars 6144664 & 6145471 */ 7809 BLOCK_DECL_BYREF (byref_decl) = 1; 7810 7811 /* APPLE LOCAL begin radar 5932809 - copyable byref blocks (C++ ch) */ 7812 if (TREE_CODE (decl) == VAR_DECL && COPYABLE_BYREF_LOCAL_VAR (decl)) 7813 { 7814 COPYABLE_BYREF_LOCAL_VAR (byref_decl) = 1; 7815 COPYABLE_BYREF_LOCAL_NONPOD (byref_decl) = COPYABLE_BYREF_LOCAL_NONPOD (decl); 7816 /* APPLE LOCAL radar 5847976 */ 7817 COPYABLE_WEAK_BLOCK (byref_decl) = COPYABLE_WEAK_BLOCK (decl); 7818 } 7819 /* APPLE LOCAL end radar 5932809 - copyable byref blocks (C++ ch) */ 7820 7821 /* In the presence of nested "{" 7822 move up the scope chain until reaching the main function body's scope. 7823 */ 7824 while (scope && !scope->function_body) 7825 scope = scope->outer; 7826 /* Current scope must be that of the main function body. */ 7827 gcc_assert (scope && scope->function_body); 7828 bind (name, byref_decl, 7829 scope, /*invisible=*/false, /*nested=*/false); 7830 cur_block->block_byref_decl_list = 7831 tree_cons (NULL_TREE, byref_decl, cur_block->block_byref_decl_list); 7832 /* APPLE LOCAL radar 5847213 - building block_original_byref_decl_list list removed. */ 7833 /* APPLE LOCAL begin radar 6289031 */ 7834#if 0 7835 if (! flag_objc_gc_only) 7836#endif 7837 push_cleanup (byref_decl, build_block_byref_release_exp (byref_decl), false); 7838 /* APPLE LOCAL end radar 6289031 */ 7839 7840 return byref_decl; 7841} 7842 7843/** 7844 build_block_ref_decl - This routine inserts a copied-in variable (a variable 7845 referenced in the block but whose scope is outside the block) in helper 7846 function's outer-most scope. It also sets its type to 'const' as such 7847 variables are read-only. 7848*/ 7849tree 7850build_block_ref_decl (tree name, tree decl) 7851{ 7852 struct c_scope *scope = current_scope; 7853 tree ref_decl; 7854 /* APPLE LOCAL radar 6212722 */ 7855 tree type, exp; 7856 /* APPLE LOCAL begin radar 5932809 - copyable byref blocks (C++ ch) */ 7857 /* 'decl' was previously declared as __block. Simply, copy the value 7858 embedded in the above variable. */ 7859 if (TREE_CODE (decl) == VAR_DECL && COPYABLE_BYREF_LOCAL_VAR (decl)) 7860 decl = build_byref_local_var_access (decl, DECL_NAME (decl)); 7861 else { 7862 /* APPLE LOCAL begin radar 5988451 (C++ ch) */ 7863 if (cur_block->prev_block_info) { 7864 /* Traverse enclosing blocks. Insert a copied-in variable in 7865 each enclosing block which has no declaration of this 7866 variable. This is to ensure that the current (inner) block 7867 has the 'frozen' value of the copied-in variable; which means 7868 the value of the copied in variable is at the point of the 7869 block declaration and *not* when the inner block is 7870 invoked. */ 7871 struct block_sema_info *cb = cur_block->prev_block_info; 7872 while (cb) { 7873 struct c_binding *b = I_SYMBOL_BINDING (name); 7874 /* Find the first declaration not in current block. */ 7875 while (b && b->decl 7876 && (TREE_CODE (b->decl) == VAR_DECL 7877 || TREE_CODE (b->decl) == PARM_DECL) 7878 && b->depth >= cur_block->the_scope->depth) 7879 b = b->shadowed; 7880 7881 /* Is the next declaration not in enclosing block? */ 7882 if (b && b->decl 7883 && (TREE_CODE (b->decl) == VAR_DECL 7884 || TREE_CODE (b->decl) == PARM_DECL) 7885 && b->depth < cb->the_scope->depth) { 7886 /* No declaration of variable seen in the block. Must insert one, 7887 so it 'freezes' the variable in this block. */ 7888 struct c_scope *save_scope = current_scope; 7889 struct block_sema_info *save_current_block = cur_block; 7890 current_scope = cb->the_scope; 7891 cur_block = cb; 7892 decl = build_block_ref_decl (name, decl); 7893 cur_block = save_current_block; 7894 current_scope = save_scope; 7895 } 7896 cb = cb->prev_block_info; 7897 } 7898 } 7899 /* APPLE LOCAL end radar 5988451 (C++ ch) */ 7900 } 7901 /* APPLE LOCAL end radar 5932809 - copyable byref blocks (C++ ch) */ 7902 /* APPLE LOCAL begin radar 6212722 */ 7903 exp = decl; 7904 type = TREE_TYPE (exp); 7905 if (TREE_CODE (type) == ARRAY_TYPE) { 7906 exp = array_to_pointer_conversion (decl); 7907 type = TREE_TYPE (exp); 7908 } 7909 else if (TREE_CODE (type) == FUNCTION_TYPE) { 7910 exp = function_to_pointer_conversion (exp); 7911 type = TREE_TYPE (exp); 7912 } 7913 ref_decl = build_decl (VAR_DECL, name, 7914 build_qualified_type (type, TYPE_QUAL_CONST)); 7915 /* APPLE LOCAL end radar 6212722 */ 7916 /* APPLE LOCAL begin radars 6144664 & 6145471 */ 7917 DECL_SOURCE_LOCATION (ref_decl) = DECL_SOURCE_LOCATION 7918 (cur_block->helper_func_decl); 7919 /* APPLE LOCAL end radars 6144664 & 6145471 */ 7920 DECL_INITIAL (ref_decl) = error_mark_node; 7921 /* APPLE LOCAL radar 5805175 - blocks (C++ ch) */ 7922 c_apply_type_quals_to_decl (TYPE_QUAL_CONST, ref_decl); 7923 BLOCK_DECL_COPIED (ref_decl) = 1; 7924 7925 /* Find the scope for function body (outer-most scope) and insert 7926 this variable in that scope. This is to avoid duplicate 7927 declaration of the save variable. */ 7928 while (scope && !scope->function_body) 7929 scope = scope->outer; 7930 /* We are enterring the copied-in variable in helper function's 7931 outer scope; that of its main body. */ 7932 gcc_assert (scope); 7933 bind (name, ref_decl, 7934 scope, /*invisible=*/false, /*nested=*/false); 7935 cur_block->block_ref_decl_list = 7936 tree_cons (NULL_TREE, ref_decl, cur_block->block_ref_decl_list); 7937 cur_block->block_original_ref_decl_list = 7938 /* APPLE LOCAL radar 6212722 */ 7939 tree_cons (NULL_TREE, exp, cur_block->block_original_ref_decl_list); 7940 return ref_decl; 7941} 7942 7943/* APPLE LOCAL begin radar 5847213 - radar 6329245 */ 7944static GTY (()) tree descriptor_ptr_type; 7945static GTY (()) tree descriptor_ptr_type_with_copydispose; 7946/** build_block_descriptor_type - This routine builds following internal type: 7947 struct __block_descriptor { 7948 unsigned long int reserved; // NULL 7949 unsigned long int Size; // sizeof(struct Block_literal_1) 7950 7951 // optional helper functions 7952 void *CopyFuncPtr; // When BLOCK_HAS_COPY_DISPOSE is set (withCopyDispose true) 7953 void *DestroyFuncPtr; // When BLOCK_HAS_COPY_DISPOSE is set (withCopyDispose true) 7954} *descriptor_ptr_type; 7955 7956Objects of this type will always be static. This is one main component of abi change. 7957*/ 7958tree 7959build_block_descriptor_type (bool withCopyDispose) 7960{ 7961 tree field_decl_chain, field_decl; 7962 tree main_type; 7963 7964 if (withCopyDispose && descriptor_ptr_type_with_copydispose) 7965 return descriptor_ptr_type_with_copydispose; 7966 if (!withCopyDispose && descriptor_ptr_type) 7967 return descriptor_ptr_type; 7968 7969 main_type = 7970 withCopyDispose ? 7971 start_struct (RECORD_TYPE, get_identifier ("__block_descriptor_withcopydispose")) 7972 : start_struct (RECORD_TYPE, get_identifier ("__block_descriptor")); 7973 7974 /* unsigned long int reserved; */ 7975 field_decl = build_decl (FIELD_DECL, get_identifier ("reserved"), long_unsigned_type_node); 7976 field_decl_chain = field_decl; 7977 7978 /* unsigned long int Size; */ 7979 field_decl = build_decl (FIELD_DECL, get_identifier ("Size"), long_unsigned_type_node); 7980 chainon (field_decl_chain, field_decl); 7981 7982 if (withCopyDispose) 7983 { 7984 /* void *CopyFuncPtr; */ 7985 field_decl = build_decl (FIELD_DECL, get_identifier ("CopyFuncPtr"), ptr_type_node); 7986 chainon (field_decl_chain, field_decl); 7987 /* void *DestroyFuncPtr; */ 7988 field_decl = build_decl (FIELD_DECL, get_identifier ("DestroyFuncPtr"), ptr_type_node); 7989 chainon (field_decl_chain, field_decl); 7990 } 7991 7992 /* Mark this struct as being a block struct rather than a 'normal' 7993 struct. */ 7994 TYPE_BLOCK_IMPL_STRUCT (main_type) = 1; 7995 finish_struct (main_type, field_decl_chain, NULL_TREE); 7996 7997 main_type = build_pointer_type (main_type); 7998 if (withCopyDispose) 7999 descriptor_ptr_type_with_copydispose = main_type; 8000 else 8001 descriptor_ptr_type = main_type; 8002 return main_type; 8003} 8004/* APPLE LOCAL end radar 5847213 - radar 6329245 */ 8005 8006/* APPLE LOCAL begin radar 5814025 (C++ ch) */ 8007struct c_declarator * 8008make_block_pointer_declarator (struct c_declspecs *type_quals_attrs, 8009 struct c_declarator *target) 8010{ 8011 int quals = 0; 8012 struct c_declarator *itarget = target; 8013 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator); 8014 8015 if (type_quals_attrs) 8016 { 8017 tree attrs = type_quals_attrs->attrs; 8018 quals = quals_from_declspecs (type_quals_attrs); 8019 if (attrs != NULL_TREE) 8020 itarget = build_attrs_declarator (attrs, target); 8021 } 8022 ret->kind = cdk_block_pointer; 8023 /* APPLE LOCAL radar 5882266 (C++ ch) */ 8024 ret->declarator = itarget; 8025 ret->u.pointer_quals = quals; 8026 return ret; 8027} 8028/* APPLE LOCAL end radar 5814025 (C++ ch) */ 8029 8030tree 8031begin_block (void) 8032{ 8033 struct block_sema_info *csi; 8034#if 0 8035 push_scope (); 8036#endif 8037 csi = (struct block_sema_info*)xcalloc (1, sizeof (struct block_sema_info)); 8038 csi->prev_block_info = cur_block; 8039 cur_block = csi; 8040 return NULL_TREE; 8041} 8042 8043struct block_sema_info * 8044finish_block (tree block __attribute__ ((__unused__))) 8045{ 8046 struct block_sema_info *csi = cur_block; 8047 cur_block = cur_block->prev_block_info; 8048#if 0 8049 pop_scope (); 8050#endif 8051 return csi; 8052} 8053 8054bool 8055in_imm_block (void) 8056{ 8057 /* APPLE LOCAL radar 5988451 (C++ ch) */ 8058 return (cur_block && cur_block->the_scope == current_scope); 8059} 8060 8061/* This routine returns 'true' if 'name' has a declaration inside the 8062 current block, 'false' otherwise. If 'name' has no declaration in 8063 the current block, it returns in DECL the user declaration for 8064 'name' found in the enclosing scope. Note that if it is declared 8065 in current declaration, it can be either a user declaration or a 8066 byref/copied-in declaration added in current block's scope by the 8067 compiler. */ 8068bool 8069lookup_name_in_block (tree name, tree *decl) 8070{ 8071 if (cur_block) 8072 { 8073 struct c_binding *b = I_SYMBOL_BINDING (name); 8074 if (b->depth >= cur_block->the_scope->depth) 8075 return true; 8076 8077 /* Check for common case of block nested inside a non-block. */ 8078 if (!cur_block->prev_block_info) 8079 return false; 8080 /* Check for less common case of nested blocks. */ 8081 /* Declaration not in current block. Find the first user 8082 declaration of 'name' in outer scope. */ 8083 /* APPLE LOCAL begin radar 5988451 (C++ ch) */ 8084 /* Check for variables only, as we may have parameters, such as 8085 'self' */ 8086 /* Note that if a copied-in variable (BLOCK_DECL_COPIED) in the 8087 enclosing block is found, it must be returned as this is 8088 where the variable in current (nested block) will have to get 8089 its value. */ 8090 while (b && b->decl 8091 && (TREE_CODE (b->decl) == VAR_DECL) 8092 && BLOCK_DECL_BYREF (b->decl)) 8093 b = b->shadowed; 8094 /* APPLE LOCAL end radar 5988451 (C++ ch) */ 8095 if (b && b->decl) 8096 *decl = b->decl; 8097 } 8098 return false; 8099} 8100 8101static struct c_scope *save_current_scope; 8102static tree save_current_function_decl; 8103void 8104push_to_top_level (void) 8105{ 8106 save_current_scope = current_scope; 8107 save_current_function_decl = current_function_decl; 8108 current_scope = file_scope; 8109 current_function_decl = NULL_TREE; 8110} 8111 8112void 8113pop_from_top_level (void) 8114{ 8115 current_scope = save_current_scope; 8116 current_function_decl = save_current_function_decl; 8117} 8118 8119/** 8120 build_helper_func_decl - This routine builds a FUNCTION_DECL for 8121 a block helper function. 8122*/ 8123tree 8124build_helper_func_decl (tree ident, tree type) 8125{ 8126 tree func_decl = build_decl (FUNCTION_DECL, ident, type); 8127 DECL_EXTERNAL (func_decl) = 0; 8128 TREE_PUBLIC (func_decl) = 0; 8129 TREE_USED (func_decl) = 1; 8130 TREE_NOTHROW (func_decl) = 0; 8131 /* APPLE LOCAL radar 6172148 */ 8132 BLOCK_SYNTHESIZED_FUNC (func_decl) = 1; 8133 return func_decl; 8134} 8135 8136/** 8137 start_block_helper_function - This is a light-weight version of start_function(). 8138 It has removed all the fuss in the start_function(). 8139 */ 8140void 8141start_block_helper_function (tree decl1) 8142{ 8143 struct c_label_context_se *nstack_se; 8144 struct c_label_context_vm *nstack_vm; 8145 tree restype, resdecl; 8146 8147 current_function_returns_value = 0; /* Assume, until we see it does. */ 8148 current_function_returns_null = 0; 8149 current_function_returns_abnormally = 0; 8150 warn_about_return_type = 0; 8151 c_switch_stack = NULL; 8152 8153 nstack_se = XOBNEW (&parser_obstack, struct c_label_context_se); 8154 nstack_se->labels_def = NULL; 8155 nstack_se->labels_used = NULL; 8156 nstack_se->next = label_context_stack_se; 8157 label_context_stack_se = nstack_se; 8158 8159 nstack_vm = XOBNEW (&parser_obstack, struct c_label_context_vm); 8160 nstack_vm->labels_def = NULL; 8161 nstack_vm->labels_used = NULL; 8162 nstack_vm->scope = 0; 8163 nstack_vm->next = label_context_stack_vm; 8164 label_context_stack_vm = nstack_vm; 8165 8166 /* Indicate no valid break/continue context by setting these variables 8167 to some non-null, non-label value. We'll notice and emit the proper 8168 error message in c_finish_bc_stmt. */ 8169 c_break_label = c_cont_label = size_zero_node; 8170 8171 announce_function (decl1); 8172 8173 /* Make the init_value nonzero so pushdecl knows this is not tentative. 8174 error_mark_node is replaced below (in pop_scope) with the BLOCK. */ 8175 DECL_INITIAL (decl1) = error_mark_node; 8176 8177 current_function_prototype_locus = UNKNOWN_LOCATION; 8178 current_function_prototype_built_in = false; 8179 current_function_prototype_arg_types = NULL_TREE; 8180 8181 /* This function exists in static storage. 8182 (This does not mean `static' in the C sense!) */ 8183 TREE_STATIC (decl1) = 1; 8184 /* A helper function is not global */ 8185 TREE_PUBLIC (decl1) = 0; 8186 8187 /* This is the earliest point at which we might know the assembler 8188 name of the function. Thus, if it's set before this, die horribly. */ 8189 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1)); 8190 current_function_decl = pushdecl (decl1); 8191 8192 push_scope (); 8193 declare_parm_level (); 8194 8195 restype = TREE_TYPE (TREE_TYPE (current_function_decl)); 8196 resdecl = build_decl (RESULT_DECL, NULL_TREE, restype); 8197 DECL_ARTIFICIAL (resdecl) = 1; 8198 DECL_IGNORED_P (resdecl) = 1; 8199 DECL_RESULT (current_function_decl) = resdecl; 8200 8201 start_fname_decls (); 8202} 8203 8204/** 8205 declare_block_prologue_local_vars - utility routine to do the actual 8206 declaration and initialization for each referecned block variable. 8207*/ 8208static void 8209declare_block_prologue_local_vars (tree self_parm, tree component, 8210 tree stmt) 8211{ 8212 tree decl, block_component; 8213 tree_stmt_iterator i; 8214 tree decl_stmt; 8215 8216 decl = component; 8217 block_component = build_component_ref (build_indirect_ref (self_parm, "->"), 8218 DECL_NAME (component)); 8219 gcc_assert (block_component); 8220 DECL_EXTERNAL (decl) = 0; 8221 TREE_STATIC (decl) = 0; 8222 TREE_USED (decl) = 1; 8223 DECL_CONTEXT (decl) = current_function_decl; 8224 DECL_ARTIFICIAL (decl) = 1; 8225 DECL_INITIAL (decl) = block_component; 8226 /* Prepend a DECL_EXPR statement to the statement list. */ 8227 i = tsi_start (stmt); 8228 decl_stmt = build_stmt (DECL_EXPR, decl); 8229 /* APPLE LOCAL Radar 5811961, Fix location of block prologue vars (C++ ch) */ 8230 SET_EXPR_LOCATION (decl_stmt, DECL_SOURCE_LOCATION (decl)); 8231 /* APPLE LOCAL begin radar 6163705, Blocks prologues */ 8232 /* Give the prologue statements a line number of one before the beginning of 8233 the function, to make them easily identifiable later. */ 8234 EXPR_LINENO (decl_stmt) = DECL_SOURCE_LINE (decl) - 1; 8235 /* APPLE LOCAL end radar 6163705, Blocks prologues */ 8236 tsi_link_before (&i, decl_stmt, TSI_SAME_STMT); 8237} 8238 8239/** 8240 block_build_prologue 8241 - This routine builds the declarations for the 8242 variables referenced in the block; as in: 8243 int *y = .block_descriptor->y; 8244 int x = .block_descriptor->x; 8245 8246 The decl_expr declaration for each initialization is enterred at the 8247 beginning of the helper function's statement-list which is passed 8248 in block_impl->block_body. 8249*/ 8250void 8251block_build_prologue (struct block_sema_info *block_impl) 8252{ 8253 tree chain; 8254 /* APPLE LOCAL radar 6404979 */ 8255 tree self_parm = lookup_name (get_identifier (".block_descriptor")); 8256 gcc_assert (self_parm); 8257 8258 for (chain = block_impl->block_ref_decl_list; chain; 8259 chain = TREE_CHAIN (chain)) 8260 declare_block_prologue_local_vars (self_parm, TREE_VALUE (chain), 8261 block_impl->block_body); 8262 8263 for (chain = block_impl->block_byref_decl_list; chain; 8264 chain = TREE_CHAIN (chain)) 8265 declare_block_prologue_local_vars (self_parm, TREE_VALUE (chain), 8266 block_impl->block_body); 8267} 8268/* APPLE LOCAL end radar 5732232 - blocks (C++ ch) */ 8269 8270/* Return a pointer to a structure for an empty list of declaration 8271 specifiers. */ 8272 8273struct c_declspecs * 8274build_null_declspecs (void) 8275{ 8276 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs); 8277 ret->type = 0; 8278 ret->decl_attr = 0; 8279 ret->attrs = 0; 8280 ret->typespec_word = cts_none; 8281 ret->storage_class = csc_none; 8282 ret->declspecs_seen_p = false; 8283 ret->type_seen_p = false; 8284 ret->non_sc_seen_p = false; 8285 ret->typedef_p = false; 8286 ret->tag_defined_p = false; 8287 ret->explicit_signed_p = false; 8288 ret->deprecated_p = false; 8289 /* APPLE LOCAL "unavailable" attribute (radar 2809697) */ 8290 ret->unavailable_p = false; 8291 ret->default_int_p = false; 8292 ret->long_p = false; 8293 ret->long_long_p = false; 8294 ret->short_p = false; 8295 ret->signed_p = false; 8296 ret->unsigned_p = false; 8297 ret->complex_p = false; 8298 ret->inline_p = false; 8299 ret->thread_p = false; 8300 ret->const_p = false; 8301 ret->volatile_p = false; 8302 ret->restrict_p = false; 8303 return ret; 8304} 8305 8306/* Add the type qualifier QUAL to the declaration specifiers SPECS, 8307 returning SPECS. */ 8308 8309struct c_declspecs * 8310declspecs_add_qual (struct c_declspecs *specs, tree qual) 8311{ 8312 enum rid i; 8313 bool dupe = false; 8314 specs->non_sc_seen_p = true; 8315 specs->declspecs_seen_p = true; 8316 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE 8317 && C_IS_RESERVED_WORD (qual)); 8318 i = C_RID_CODE (qual); 8319 switch (i) 8320 { 8321 case RID_CONST: 8322 dupe = specs->const_p; 8323 specs->const_p = true; 8324 break; 8325 case RID_VOLATILE: 8326 dupe = specs->volatile_p; 8327 specs->volatile_p = true; 8328 break; 8329 case RID_RESTRICT: 8330 dupe = specs->restrict_p; 8331 specs->restrict_p = true; 8332 break; 8333 default: 8334 gcc_unreachable (); 8335 } 8336 if (dupe && pedantic && !flag_isoc99) 8337 pedwarn ("duplicate %qE", qual); 8338 return specs; 8339} 8340 8341/* Add the type specifier TYPE to the declaration specifiers SPECS, 8342 returning SPECS. */ 8343 8344struct c_declspecs * 8345declspecs_add_type (struct c_declspecs *specs, struct c_typespec spec) 8346{ 8347 tree type = spec.spec; 8348 specs->non_sc_seen_p = true; 8349 specs->declspecs_seen_p = true; 8350 specs->type_seen_p = true; 8351 if (TREE_DEPRECATED (type)) 8352 specs->deprecated_p = true; 8353 8354 /* APPLE LOCAL begin "unavailable" attribute (radar 2809697) */ 8355 if (TREE_UNAVAILABLE (type)) 8356 specs->unavailable_p = true; 8357 /* APPLE LOCAL end "unavailable" attribute (radar 2809697) */ 8358 8359 /* Handle type specifier keywords. */ 8360 if (TREE_CODE (type) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (type)) 8361 { 8362 enum rid i = C_RID_CODE (type); 8363 if (specs->type) 8364 { 8365 error ("two or more data types in declaration specifiers"); 8366 return specs; 8367 } 8368 if ((int) i <= (int) RID_LAST_MODIFIER) 8369 { 8370 /* "long", "short", "signed", "unsigned" or "_Complex". */ 8371 bool dupe = false; 8372 switch (i) 8373 { 8374 case RID_LONG: 8375 if (specs->long_long_p) 8376 { 8377 error ("%<long long long%> is too long for GCC"); 8378 break; 8379 } 8380 if (specs->long_p) 8381 { 8382 if (specs->typespec_word == cts_double) 8383 { 8384 error ("both %<long long%> and %<double%> in " 8385 "declaration specifiers"); 8386 break; 8387 } 8388 if (pedantic && !flag_isoc99 && !in_system_header 8389 && warn_long_long) 8390 pedwarn ("ISO C90 does not support %<long long%>"); 8391 specs->long_long_p = 1; 8392 break; 8393 } 8394 if (specs->short_p) 8395 error ("both %<long%> and %<short%> in " 8396 "declaration specifiers"); 8397 else if (specs->typespec_word == cts_void) 8398 error ("both %<long%> and %<void%> in " 8399 "declaration specifiers"); 8400 else if (specs->typespec_word == cts_bool) 8401 error ("both %<long%> and %<_Bool%> in " 8402 "declaration specifiers"); 8403 else if (specs->typespec_word == cts_char) 8404 error ("both %<long%> and %<char%> in " 8405 "declaration specifiers"); 8406 else if (specs->typespec_word == cts_float) 8407 error ("both %<long%> and %<float%> in " 8408 "declaration specifiers"); 8409 else if (specs->typespec_word == cts_dfloat32) 8410 error ("both %<long%> and %<_Decimal32%> in " 8411 "declaration specifiers"); 8412 else if (specs->typespec_word == cts_dfloat64) 8413 error ("both %<long%> and %<_Decimal64%> in " 8414 "declaration specifiers"); 8415 else if (specs->typespec_word == cts_dfloat128) 8416 error ("both %<long%> and %<_Decimal128%> in " 8417 "declaration specifiers"); 8418 else 8419 specs->long_p = true; 8420 break; 8421 case RID_SHORT: 8422 dupe = specs->short_p; 8423 if (specs->long_p) 8424 error ("both %<long%> and %<short%> in " 8425 "declaration specifiers"); 8426 else if (specs->typespec_word == cts_void) 8427 error ("both %<short%> and %<void%> in " 8428 "declaration specifiers"); 8429 else if (specs->typespec_word == cts_bool) 8430 error ("both %<short%> and %<_Bool%> in " 8431 "declaration specifiers"); 8432 else if (specs->typespec_word == cts_char) 8433 error ("both %<short%> and %<char%> in " 8434 "declaration specifiers"); 8435 else if (specs->typespec_word == cts_float) 8436 error ("both %<short%> and %<float%> in " 8437 "declaration specifiers"); 8438 else if (specs->typespec_word == cts_double) 8439 error ("both %<short%> and %<double%> in " 8440 "declaration specifiers"); 8441 else if (specs->typespec_word == cts_dfloat32) 8442 error ("both %<short%> and %<_Decimal32%> in " 8443 "declaration specifiers"); 8444 else if (specs->typespec_word == cts_dfloat64) 8445 error ("both %<short%> and %<_Decimal64%> in " 8446 "declaration specifiers"); 8447 else if (specs->typespec_word == cts_dfloat128) 8448 error ("both %<short%> and %<_Decimal128%> in " 8449 "declaration specifiers"); 8450 else 8451 specs->short_p = true; 8452 break; 8453 case RID_SIGNED: 8454 dupe = specs->signed_p; 8455 if (specs->unsigned_p) 8456 error ("both %<signed%> and %<unsigned%> in " 8457 "declaration specifiers"); 8458 else if (specs->typespec_word == cts_void) 8459 error ("both %<signed%> and %<void%> in " 8460 "declaration specifiers"); 8461 else if (specs->typespec_word == cts_bool) 8462 error ("both %<signed%> and %<_Bool%> in " 8463 "declaration specifiers"); 8464 else if (specs->typespec_word == cts_float) 8465 error ("both %<signed%> and %<float%> in " 8466 "declaration specifiers"); 8467 else if (specs->typespec_word == cts_double) 8468 error ("both %<signed%> and %<double%> in " 8469 "declaration specifiers"); 8470 else if (specs->typespec_word == cts_dfloat32) 8471 error ("both %<signed%> and %<_Decimal32%> in " 8472 "declaration specifiers"); 8473 else if (specs->typespec_word == cts_dfloat64) 8474 error ("both %<signed%> and %<_Decimal64%> in " 8475 "declaration specifiers"); 8476 else if (specs->typespec_word == cts_dfloat128) 8477 error ("both %<signed%> and %<_Decimal128%> in " 8478 "declaration specifiers"); 8479 else 8480 specs->signed_p = true; 8481 break; 8482 case RID_UNSIGNED: 8483 dupe = specs->unsigned_p; 8484 if (specs->signed_p) 8485 error ("both %<signed%> and %<unsigned%> in " 8486 "declaration specifiers"); 8487 else if (specs->typespec_word == cts_void) 8488 error ("both %<unsigned%> and %<void%> in " 8489 "declaration specifiers"); 8490 else if (specs->typespec_word == cts_bool) 8491 error ("both %<unsigned%> and %<_Bool%> in " 8492 "declaration specifiers"); 8493 else if (specs->typespec_word == cts_float) 8494 error ("both %<unsigned%> and %<float%> in " 8495 "declaration specifiers"); 8496 else if (specs->typespec_word == cts_double) 8497 error ("both %<unsigned%> and %<double%> in " 8498 "declaration specifiers"); 8499 else if (specs->typespec_word == cts_dfloat32) 8500 error ("both %<unsigned%> and %<_Decimal32%> in " 8501 "declaration specifiers"); 8502 else if (specs->typespec_word == cts_dfloat64) 8503 error ("both %<unsigned%> and %<_Decimal64%> in " 8504 "declaration specifiers"); 8505 else if (specs->typespec_word == cts_dfloat128) 8506 error ("both %<unsigned%> and %<_Decimal128%> in " 8507 "declaration specifiers"); 8508 else 8509 specs->unsigned_p = true; 8510 break; 8511 case RID_COMPLEX: 8512 dupe = specs->complex_p; 8513 if (pedantic && !flag_isoc99 && !in_system_header) 8514 pedwarn ("ISO C90 does not support complex types"); 8515 if (specs->typespec_word == cts_void) 8516 error ("both %<complex%> and %<void%> in " 8517 "declaration specifiers"); 8518 else if (specs->typespec_word == cts_bool) 8519 error ("both %<complex%> and %<_Bool%> in " 8520 "declaration specifiers"); 8521 else if (specs->typespec_word == cts_dfloat32) 8522 error ("both %<complex%> and %<_Decimal32%> in " 8523 "declaration specifiers"); 8524 else if (specs->typespec_word == cts_dfloat64) 8525 error ("both %<complex%> and %<_Decimal64%> in " 8526 "declaration specifiers"); 8527 else if (specs->typespec_word == cts_dfloat128) 8528 error ("both %<complex%> and %<_Decimal128%> in " 8529 "declaration specifiers"); 8530 else 8531 specs->complex_p = true; 8532 break; 8533 default: 8534 gcc_unreachable (); 8535 } 8536 8537 if (dupe) 8538 error ("duplicate %qE", type); 8539 8540 return specs; 8541 } 8542 else 8543 { 8544 /* "void", "_Bool", "char", "int", "float" or "double". */ 8545 if (specs->typespec_word != cts_none) 8546 { 8547 error ("two or more data types in declaration specifiers"); 8548 return specs; 8549 } 8550 switch (i) 8551 { 8552 case RID_VOID: 8553 if (specs->long_p) 8554 error ("both %<long%> and %<void%> in " 8555 "declaration specifiers"); 8556 else if (specs->short_p) 8557 error ("both %<short%> and %<void%> in " 8558 "declaration specifiers"); 8559 else if (specs->signed_p) 8560 error ("both %<signed%> and %<void%> in " 8561 "declaration specifiers"); 8562 else if (specs->unsigned_p) 8563 error ("both %<unsigned%> and %<void%> in " 8564 "declaration specifiers"); 8565 else if (specs->complex_p) 8566 error ("both %<complex%> and %<void%> in " 8567 "declaration specifiers"); 8568 else 8569 specs->typespec_word = cts_void; 8570 return specs; 8571 case RID_BOOL: 8572 if (specs->long_p) 8573 error ("both %<long%> and %<_Bool%> in " 8574 "declaration specifiers"); 8575 else if (specs->short_p) 8576 error ("both %<short%> and %<_Bool%> in " 8577 "declaration specifiers"); 8578 else if (specs->signed_p) 8579 error ("both %<signed%> and %<_Bool%> in " 8580 "declaration specifiers"); 8581 else if (specs->unsigned_p) 8582 error ("both %<unsigned%> and %<_Bool%> in " 8583 "declaration specifiers"); 8584 else if (specs->complex_p) 8585 error ("both %<complex%> and %<_Bool%> in " 8586 "declaration specifiers"); 8587 else 8588 specs->typespec_word = cts_bool; 8589 return specs; 8590 case RID_CHAR: 8591 if (specs->long_p) 8592 error ("both %<long%> and %<char%> in " 8593 "declaration specifiers"); 8594 else if (specs->short_p) 8595 error ("both %<short%> and %<char%> in " 8596 "declaration specifiers"); 8597 else 8598 specs->typespec_word = cts_char; 8599 return specs; 8600 case RID_INT: 8601 specs->typespec_word = cts_int; 8602 return specs; 8603 case RID_FLOAT: 8604 if (specs->long_p) 8605 error ("both %<long%> and %<float%> in " 8606 "declaration specifiers"); 8607 else if (specs->short_p) 8608 error ("both %<short%> and %<float%> in " 8609 "declaration specifiers"); 8610 else if (specs->signed_p) 8611 error ("both %<signed%> and %<float%> in " 8612 "declaration specifiers"); 8613 else if (specs->unsigned_p) 8614 error ("both %<unsigned%> and %<float%> in " 8615 "declaration specifiers"); 8616 else 8617 specs->typespec_word = cts_float; 8618 return specs; 8619 case RID_DOUBLE: 8620 if (specs->long_long_p) 8621 error ("both %<long long%> and %<double%> in " 8622 "declaration specifiers"); 8623 else if (specs->short_p) 8624 error ("both %<short%> and %<double%> in " 8625 "declaration specifiers"); 8626 else if (specs->signed_p) 8627 error ("both %<signed%> and %<double%> in " 8628 "declaration specifiers"); 8629 else if (specs->unsigned_p) 8630 error ("both %<unsigned%> and %<double%> in " 8631 "declaration specifiers"); 8632 else 8633 specs->typespec_word = cts_double; 8634 return specs; 8635 case RID_DFLOAT32: 8636 case RID_DFLOAT64: 8637 case RID_DFLOAT128: 8638 { 8639 const char *str; 8640 if (i == RID_DFLOAT32) 8641 str = "_Decimal32"; 8642 else if (i == RID_DFLOAT64) 8643 str = "_Decimal64"; 8644 else 8645 str = "_Decimal128"; 8646 if (specs->long_long_p) 8647 error ("both %<long long%> and %<%s%> in " 8648 "declaration specifiers", str); 8649 if (specs->long_p) 8650 error ("both %<long%> and %<%s%> in " 8651 "declaration specifiers", str); 8652 else if (specs->short_p) 8653 error ("both %<short%> and %<%s%> in " 8654 "declaration specifiers", str); 8655 else if (specs->signed_p) 8656 error ("both %<signed%> and %<%s%> in " 8657 "declaration specifiers", str); 8658 else if (specs->unsigned_p) 8659 error ("both %<unsigned%> and %<%s%> in " 8660 "declaration specifiers", str); 8661 else if (specs->complex_p) 8662 error ("both %<complex%> and %<%s%> in " 8663 "declaration specifiers", str); 8664 else if (i == RID_DFLOAT32) 8665 specs->typespec_word = cts_dfloat32; 8666 else if (i == RID_DFLOAT64) 8667 specs->typespec_word = cts_dfloat64; 8668 else 8669 specs->typespec_word = cts_dfloat128; 8670 } 8671 if (!targetm.decimal_float_supported_p ()) 8672 error ("decimal floating point not supported for this target"); 8673 if (pedantic) 8674 pedwarn ("ISO C does not support decimal floating point"); 8675 return specs; 8676 default: 8677 /* ObjC reserved word "id", handled below. */ 8678 break; 8679 } 8680 } 8681 } 8682 8683 /* Now we have a typedef (a TYPE_DECL node), an identifier (some 8684 form of ObjC type, cases such as "int" and "long" being handled 8685 above), a TYPE (struct, union, enum and typeof specifiers) or an 8686 ERROR_MARK. In none of these cases may there have previously 8687 been any type specifiers. */ 8688 if (specs->type || specs->typespec_word != cts_none 8689 || specs->long_p || specs->short_p || specs->signed_p 8690 || specs->unsigned_p || specs->complex_p) 8691 error ("two or more data types in declaration specifiers"); 8692 else if (TREE_CODE (type) == TYPE_DECL) 8693 { 8694 if (TREE_TYPE (type) == error_mark_node) 8695 ; /* Allow the type to default to int to avoid cascading errors. */ 8696 else 8697 { 8698 specs->type = TREE_TYPE (type); 8699 specs->decl_attr = DECL_ATTRIBUTES (type); 8700 specs->typedef_p = true; 8701 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type); 8702 } 8703 } 8704 else if (TREE_CODE (type) == IDENTIFIER_NODE) 8705 { 8706 tree t = lookup_name (type); 8707 if (!t || TREE_CODE (t) != TYPE_DECL) 8708 error ("%qE fails to be a typedef or built in type", type); 8709 else if (TREE_TYPE (t) == error_mark_node) 8710 ; 8711 else 8712 specs->type = TREE_TYPE (t); 8713 } 8714 else if (TREE_CODE (type) != ERROR_MARK) 8715 { 8716 if (spec.kind == ctsk_tagdef || spec.kind == ctsk_tagfirstref) 8717 specs->tag_defined_p = true; 8718 if (spec.kind == ctsk_typeof) 8719 specs->typedef_p = true; 8720 specs->type = type; 8721 } 8722 8723 return specs; 8724} 8725 8726/* Add the storage class specifier or function specifier SCSPEC to the 8727 declaration specifiers SPECS, returning SPECS. */ 8728 8729struct c_declspecs * 8730declspecs_add_scspec (struct c_declspecs *specs, tree scspec) 8731{ 8732 enum rid i; 8733 enum c_storage_class n = csc_none; 8734 bool dupe = false; 8735 specs->declspecs_seen_p = true; 8736 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE 8737 && C_IS_RESERVED_WORD (scspec)); 8738 i = C_RID_CODE (scspec); 8739 if (extra_warnings && specs->non_sc_seen_p) 8740 warning (OPT_Wextra, "%qE is not at beginning of declaration", scspec); 8741 switch (i) 8742 { 8743 case RID_INLINE: 8744 /* C99 permits duplicate inline. Although of doubtful utility, 8745 it seems simplest to permit it in gnu89 mode as well, as 8746 there is also little utility in maintaining this as a 8747 difference between gnu89 and C99 inline. */ 8748 dupe = false; 8749 specs->inline_p = true; 8750 break; 8751 case RID_THREAD: 8752 dupe = specs->thread_p; 8753 if (specs->storage_class == csc_auto) 8754 error ("%<__thread%> used with %<auto%>"); 8755 else if (specs->storage_class == csc_register) 8756 error ("%<__thread%> used with %<register%>"); 8757 else if (specs->storage_class == csc_typedef) 8758 error ("%<__thread%> used with %<typedef%>"); 8759 else 8760 specs->thread_p = true; 8761 break; 8762 case RID_AUTO: 8763 n = csc_auto; 8764 break; 8765 case RID_EXTERN: 8766 n = csc_extern; 8767 /* Diagnose "__thread extern". */ 8768 if (specs->thread_p) 8769 error ("%<__thread%> before %<extern%>"); 8770 break; 8771 case RID_REGISTER: 8772 n = csc_register; 8773 break; 8774 case RID_STATIC: 8775 n = csc_static; 8776 /* Diagnose "__thread static". */ 8777 if (specs->thread_p) 8778 error ("%<__thread%> before %<static%>"); 8779 break; 8780 case RID_TYPEDEF: 8781 n = csc_typedef; 8782 break; 8783 default: 8784 gcc_unreachable (); 8785 } 8786 if (n != csc_none && n == specs->storage_class) 8787 dupe = true; 8788 if (dupe) 8789 error ("duplicate %qE", scspec); 8790 if (n != csc_none) 8791 { 8792 if (specs->storage_class != csc_none && n != specs->storage_class) 8793 { 8794 error ("multiple storage classes in declaration specifiers"); 8795 } 8796 else 8797 { 8798 specs->storage_class = n; 8799 if (n != csc_extern && n != csc_static && specs->thread_p) 8800 { 8801 error ("%<__thread%> used with %qE", scspec); 8802 specs->thread_p = false; 8803 } 8804 } 8805 } 8806 return specs; 8807} 8808 8809/* Add the attributes ATTRS to the declaration specifiers SPECS, 8810 returning SPECS. */ 8811 8812struct c_declspecs * 8813declspecs_add_attrs (struct c_declspecs *specs, tree attrs) 8814{ 8815 specs->attrs = chainon (attrs, specs->attrs); 8816 specs->declspecs_seen_p = true; 8817 return specs; 8818} 8819 8820/* Combine "long", "short", "signed", "unsigned" and "_Complex" type 8821 specifiers with any other type specifier to determine the resulting 8822 type. This is where ISO C checks on complex types are made, since 8823 "_Complex long" is a prefix of the valid ISO C type "_Complex long 8824 double". */ 8825 8826struct c_declspecs * 8827finish_declspecs (struct c_declspecs *specs) 8828{ 8829 /* If a type was specified as a whole, we have no modifiers and are 8830 done. */ 8831 if (specs->type != NULL_TREE) 8832 { 8833 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p 8834 && !specs->signed_p && !specs->unsigned_p 8835 && !specs->complex_p); 8836 return specs; 8837 } 8838 8839 /* If none of "void", "_Bool", "char", "int", "float" or "double" 8840 has been specified, treat it as "int" unless "_Complex" is 8841 present and there are no other specifiers. If we just have 8842 "_Complex", it is equivalent to "_Complex double", but e.g. 8843 "_Complex short" is equivalent to "_Complex short int". */ 8844 if (specs->typespec_word == cts_none) 8845 { 8846 if (specs->long_p || specs->short_p 8847 || specs->signed_p || specs->unsigned_p) 8848 { 8849 specs->typespec_word = cts_int; 8850 } 8851 else if (specs->complex_p) 8852 { 8853 specs->typespec_word = cts_double; 8854 if (pedantic) 8855 pedwarn ("ISO C does not support plain %<complex%> meaning " 8856 "%<double complex%>"); 8857 } 8858 else 8859 { 8860 specs->typespec_word = cts_int; 8861 specs->default_int_p = true; 8862 /* We don't diagnose this here because grokdeclarator will 8863 give more specific diagnostics according to whether it is 8864 a function definition. */ 8865 } 8866 } 8867 8868 /* If "signed" was specified, record this to distinguish "int" and 8869 "signed int" in the case of a bit-field with 8870 -funsigned-bitfields. */ 8871 specs->explicit_signed_p = specs->signed_p; 8872 8873 /* Now compute the actual type. */ 8874 switch (specs->typespec_word) 8875 { 8876 case cts_void: 8877 gcc_assert (!specs->long_p && !specs->short_p 8878 && !specs->signed_p && !specs->unsigned_p 8879 && !specs->complex_p); 8880 specs->type = void_type_node; 8881 break; 8882 case cts_bool: 8883 gcc_assert (!specs->long_p && !specs->short_p 8884 && !specs->signed_p && !specs->unsigned_p 8885 && !specs->complex_p); 8886 specs->type = boolean_type_node; 8887 break; 8888 case cts_char: 8889 gcc_assert (!specs->long_p && !specs->short_p); 8890 gcc_assert (!(specs->signed_p && specs->unsigned_p)); 8891 if (specs->signed_p) 8892 specs->type = signed_char_type_node; 8893 else if (specs->unsigned_p) 8894 specs->type = unsigned_char_type_node; 8895 else 8896 specs->type = char_type_node; 8897 if (specs->complex_p) 8898 { 8899 if (pedantic) 8900 pedwarn ("ISO C does not support complex integer types"); 8901 specs->type = build_complex_type (specs->type); 8902 } 8903 break; 8904 case cts_int: 8905 gcc_assert (!(specs->long_p && specs->short_p)); 8906 gcc_assert (!(specs->signed_p && specs->unsigned_p)); 8907 if (specs->long_long_p) 8908 specs->type = (specs->unsigned_p 8909 ? long_long_unsigned_type_node 8910 : long_long_integer_type_node); 8911 else if (specs->long_p) 8912 specs->type = (specs->unsigned_p 8913 ? long_unsigned_type_node 8914 : long_integer_type_node); 8915 else if (specs->short_p) 8916 specs->type = (specs->unsigned_p 8917 ? short_unsigned_type_node 8918 : short_integer_type_node); 8919 else 8920 specs->type = (specs->unsigned_p 8921 ? unsigned_type_node 8922 : integer_type_node); 8923 if (specs->complex_p) 8924 { 8925 if (pedantic) 8926 pedwarn ("ISO C does not support complex integer types"); 8927 specs->type = build_complex_type (specs->type); 8928 } 8929 break; 8930 case cts_float: 8931 gcc_assert (!specs->long_p && !specs->short_p 8932 && !specs->signed_p && !specs->unsigned_p); 8933 specs->type = (specs->complex_p 8934 ? complex_float_type_node 8935 : float_type_node); 8936 break; 8937 case cts_double: 8938 gcc_assert (!specs->long_long_p && !specs->short_p 8939 && !specs->signed_p && !specs->unsigned_p); 8940 if (specs->long_p) 8941 { 8942 specs->type = (specs->complex_p 8943 ? complex_long_double_type_node 8944 : long_double_type_node); 8945 } 8946 else 8947 { 8948 specs->type = (specs->complex_p 8949 ? complex_double_type_node 8950 : double_type_node); 8951 } 8952 break; 8953 case cts_dfloat32: 8954 case cts_dfloat64: 8955 case cts_dfloat128: 8956 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p 8957 && !specs->signed_p && !specs->unsigned_p && !specs->complex_p); 8958 if (specs->typespec_word == cts_dfloat32) 8959 specs->type = dfloat32_type_node; 8960 else if (specs->typespec_word == cts_dfloat64) 8961 specs->type = dfloat64_type_node; 8962 else 8963 specs->type = dfloat128_type_node; 8964 break; 8965 default: 8966 gcc_unreachable (); 8967 } 8968 8969 return specs; 8970} 8971 8972/* Synthesize a function which calls all the global ctors or global 8973 dtors in this file. This is only used for targets which do not 8974 support .ctors/.dtors sections. FIXME: Migrate into cgraph. */ 8975static void 8976build_cdtor (int method_type, tree cdtors) 8977{ 8978 tree body = 0; 8979 8980 if (!cdtors) 8981 return; 8982 8983 for (; cdtors; cdtors = TREE_CHAIN (cdtors)) 8984 append_to_statement_list (build_function_call (TREE_VALUE (cdtors), 0), 8985 &body); 8986 8987 cgraph_build_static_cdtor (method_type, body, DEFAULT_INIT_PRIORITY); 8988} 8989 8990/* A subroutine of c_write_global_declarations. Perform final processing 8991 on one file scope's declarations (or the external scope's declarations), 8992 GLOBALS. */ 8993 8994static void 8995c_write_global_declarations_1 (tree globals) 8996{ 8997 tree decl; 8998 bool reconsider; 8999 9000 /* Process the decls in the order they were written. */ 9001 for (decl = globals; decl; decl = TREE_CHAIN (decl)) 9002 { 9003 /* Check for used but undefined static functions using the C 9004 standard's definition of "used", and set TREE_NO_WARNING so 9005 that check_global_declarations doesn't repeat the check. */ 9006 if (TREE_CODE (decl) == FUNCTION_DECL 9007 && DECL_INITIAL (decl) == 0 9008 && DECL_EXTERNAL (decl) 9009 && !TREE_PUBLIC (decl) 9010 && C_DECL_USED (decl)) 9011 { 9012 pedwarn ("%q+F used but never defined", decl); 9013 TREE_NO_WARNING (decl) = 1; 9014 } 9015 9016 wrapup_global_declaration_1 (decl); 9017 } 9018 9019 do 9020 { 9021 reconsider = false; 9022 for (decl = globals; decl; decl = TREE_CHAIN (decl)) 9023 reconsider |= wrapup_global_declaration_2 (decl); 9024 } 9025 while (reconsider); 9026 9027 for (decl = globals; decl; decl = TREE_CHAIN (decl)) 9028 check_global_declaration_1 (decl); 9029} 9030 9031/* A subroutine of c_write_global_declarations Emit debug information for each 9032 of the declarations in GLOBALS. */ 9033 9034static void 9035c_write_global_declarations_2 (tree globals) 9036{ 9037 tree decl; 9038 9039 for (decl = globals; decl ; decl = TREE_CHAIN (decl)) 9040 debug_hooks->global_decl (decl); 9041} 9042 9043/* Preserve the external declarations scope across a garbage collect. */ 9044static GTY(()) tree ext_block; 9045 9046void 9047c_write_global_declarations (void) 9048{ 9049 tree t; 9050 9051 /* We don't want to do this if generating a PCH. */ 9052 if (pch_file) 9053 return; 9054 9055 /* Don't waste time on further processing if -fsyntax-only or we've 9056 encountered errors. */ 9057 if (flag_syntax_only || errorcount || sorrycount || cpp_errors (parse_in)) 9058 return; 9059 9060 /* Close the external scope. */ 9061 ext_block = pop_scope (); 9062 external_scope = 0; 9063 gcc_assert (!current_scope); 9064 9065 if (ext_block) 9066 { 9067 tree tmp = BLOCK_VARS (ext_block); 9068 int flags; 9069 FILE * stream = dump_begin (TDI_tu, &flags); 9070 if (stream && tmp) 9071 { 9072 dump_node (tmp, flags & ~TDF_SLIM, stream); 9073 dump_end (TDI_tu, stream); 9074 } 9075 } 9076 9077 /* Process all file scopes in this compilation, and the external_scope, 9078 through wrapup_global_declarations and check_global_declarations. */ 9079 for (t = all_translation_units; t; t = TREE_CHAIN (t)) 9080 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t))); 9081 c_write_global_declarations_1 (BLOCK_VARS (ext_block)); 9082 9083 /* Generate functions to call static constructors and destructors 9084 for targets that do not support .ctors/.dtors sections. These 9085 functions have magic names which are detected by collect2. */ 9086 build_cdtor ('I', static_ctors); static_ctors = 0; 9087 build_cdtor ('D', static_dtors); static_dtors = 0; 9088 9089 /* We're done parsing; proceed to optimize and emit assembly. 9090 FIXME: shouldn't be the front end's responsibility to call this. */ 9091 cgraph_optimize (); 9092 9093 /* After cgraph has had a chance to emit everything that's going to 9094 be emitted, output debug information for globals. */ 9095 if (errorcount == 0 && sorrycount == 0) 9096 { 9097 timevar_push (TV_SYMOUT); 9098 for (t = all_translation_units; t; t = TREE_CHAIN (t)) 9099 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t))); 9100 c_write_global_declarations_2 (BLOCK_VARS (ext_block)); 9101 timevar_pop (TV_SYMOUT); 9102 } 9103 9104 ext_block = NULL; 9105} 9106 9107/* APPLE LOCAL begin radar 5741070 */ 9108 9109/* Given an IDENTIFIER tree for a class interface, find (if possible) and 9110 return the record type for the class interface. */ 9111 9112tree 9113c_return_interface_record_type (tree typename) 9114{ 9115 enum tree_code_class class; 9116 enum tree_code code; 9117 tree retval = NULL; 9118 9119 if (typename == NULL) 9120 return retval; 9121 9122 code = TREE_CODE (typename); 9123 class = TREE_CODE_CLASS (code); 9124 9125 if (code != IDENTIFIER_NODE 9126 || class != tcc_exceptional) 9127 return retval; 9128 9129 retval = I_TAG_DECL (typename); 9130 9131 if (TREE_CODE (retval) != RECORD_TYPE) 9132 retval = NULL; 9133 9134 return retval; 9135} 9136/* APPLE LOCAL end radar 5741070 */ 9137 9138#include "gt-c-decl.h" 9139