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 []. ABSTRACT_P is true if it is an 3154 abstract declarator, false otherwise; this is used to reject static 3155 and type qualifiers in abstract declarators, where they are not in 3156 the C99 grammar (subject to possible change in DR#289). */ 3157 3158struct c_declarator * 3159set_array_declarator_inner (struct c_declarator *decl, 3160 struct c_declarator *inner, bool abstract_p) 3161{ 3162 decl->declarator = inner; 3163 if (abstract_p && (decl->u.array.quals != TYPE_UNQUALIFIED 3164 || decl->u.array.attrs != NULL_TREE 3165 || decl->u.array.static_p)) 3166 error ("static or type qualifiers in abstract declarator"); 3167 return decl; 3168} 3169 3170/* INIT is a constructor that forms DECL's initializer. If the final 3171 element initializes a flexible array field, add the size of that 3172 initializer to DECL's size. */ 3173 3174static void 3175add_flexible_array_elts_to_size (tree decl, tree init) 3176{ 3177 tree elt, type; 3178 3179 if (VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (init))) 3180 return; 3181 3182 elt = VEC_last (constructor_elt, CONSTRUCTOR_ELTS (init))->value; 3183 type = TREE_TYPE (elt); 3184 if (TREE_CODE (type) == ARRAY_TYPE 3185 && TYPE_SIZE (type) == NULL_TREE 3186 && TYPE_DOMAIN (type) != NULL_TREE 3187 && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) == NULL_TREE) 3188 { 3189 complete_array_type (&type, elt, false); 3190 DECL_SIZE (decl) 3191 = size_binop (PLUS_EXPR, DECL_SIZE (decl), TYPE_SIZE (type)); 3192 DECL_SIZE_UNIT (decl) 3193 = size_binop (PLUS_EXPR, DECL_SIZE_UNIT (decl), TYPE_SIZE_UNIT (type)); 3194 } 3195} 3196 3197/* APPLE LOCAL begin blocks 6339747 */ 3198/* Decode a block literal type, such as "int **", returning a ...FUNCTION_DECL node. */ 3199 3200tree 3201grokblockdecl (struct c_declspecs *specs, struct c_declarator *declarator) 3202{ 3203 tree decl; 3204 tree attrs = specs->attrs; 3205 3206 specs->attrs = NULL_TREE; 3207 3208 decl = grokdeclarator (declarator, specs, BLOCKDEF, 3209 false, NULL); 3210 3211 /* Apply attributes. */ 3212 decl_attributes (&decl, attrs, 0); 3213 3214 return decl; 3215} 3216/* APPLE LOCAL end blocks 6339747 */ 3217 3218/* Decode a "typename", such as "int **", returning a ..._TYPE node. */ 3219 3220tree 3221groktypename (struct c_type_name *type_name) 3222{ 3223 tree type; 3224 tree attrs = type_name->specs->attrs; 3225 3226 type_name->specs->attrs = NULL_TREE; 3227 3228 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME, 3229 false, NULL); 3230 3231 /* Apply attributes. */ 3232 decl_attributes (&type, attrs, 0); 3233 3234 return type; 3235} 3236 3237/* Decode a declarator in an ordinary declaration or data definition. 3238 This is called as soon as the type information and variable name 3239 have been parsed, before parsing the initializer if any. 3240 Here we create the ..._DECL node, fill in its type, 3241 and put it on the list of decls for the current context. 3242 The ..._DECL node is returned as the value. 3243 3244 Exception: for arrays where the length is not specified, 3245 the type is left null, to be filled in by `finish_decl'. 3246 3247 Function definitions do not come here; they go to start_function 3248 instead. However, external and forward declarations of functions 3249 do go through here. Structure field declarations are done by 3250 grokfield and not through here. */ 3251 3252tree 3253start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs, 3254 bool initialized, tree attributes) 3255{ 3256 tree decl; 3257 tree tem; 3258 3259 /* An object declared as __attribute__((deprecated)) suppresses 3260 warnings of uses of other deprecated items. */ 3261 /* APPLE LOCAL begin "unavailable" attribute (radar 2809697) */ 3262 /* An object declared as __attribute__((unavailable)) suppresses 3263 any reports of being declared with unavailable or deprecated 3264 items. An object declared as __attribute__((deprecated)) 3265 suppresses warnings of uses of other deprecated items. */ 3266#ifdef A_LESS_INEFFICENT_WAY /* which I really don't want to do! */ 3267 if (lookup_attribute ("deprecated", attributes)) 3268 deprecated_state = DEPRECATED_SUPPRESS; 3269 else if (lookup_attribute ("unavailable", attributes)) 3270 deprecated_state = DEPRECATED_UNAVAILABLE_SUPPRESS; 3271#else /* a more efficient way doing what lookup_attribute would do */ 3272 tree a; 3273 3274 for (a = attributes; a; a = TREE_CHAIN (a)) 3275 { 3276 tree name = TREE_PURPOSE (a); 3277 if (TREE_CODE (name) == IDENTIFIER_NODE) 3278 if (is_attribute_p ("deprecated", name)) 3279 { 3280 deprecated_state = DEPRECATED_SUPPRESS; 3281 break; 3282 } 3283 if (is_attribute_p ("unavailable", name)) 3284 { 3285 deprecated_state = DEPRECATED_UNAVAILABLE_SUPPRESS; 3286 break; 3287 } 3288 } 3289#endif 3290 /* APPLE LOCAL end "unavailable" attribute (radar 2809697) */ 3291 3292 decl = grokdeclarator (declarator, declspecs, 3293 NORMAL, initialized, NULL); 3294 if (!decl) 3295 return 0; 3296 3297 deprecated_state = DEPRECATED_NORMAL; 3298 3299 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL 3300 && MAIN_NAME_P (DECL_NAME (decl))) 3301 warning (OPT_Wmain, "%q+D is usually a function", decl); 3302 3303 if (initialized) 3304 /* Is it valid for this decl to have an initializer at all? 3305 If not, set INITIALIZED to zero, which will indirectly 3306 tell 'finish_decl' to ignore the initializer once it is parsed. */ 3307 switch (TREE_CODE (decl)) 3308 { 3309 case TYPE_DECL: 3310 error ("typedef %qD is initialized (use __typeof__ instead)", decl); 3311 initialized = 0; 3312 break; 3313 3314 case FUNCTION_DECL: 3315 error ("function %qD is initialized like a variable", decl); 3316 initialized = 0; 3317 break; 3318 3319 case PARM_DECL: 3320 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */ 3321 error ("parameter %qD is initialized", decl); 3322 initialized = 0; 3323 break; 3324 3325 default: 3326 /* Don't allow initializations for incomplete types except for 3327 arrays which might be completed by the initialization. */ 3328 3329 /* This can happen if the array size is an undefined macro. 3330 We already gave a warning, so we don't need another one. */ 3331 if (TREE_TYPE (decl) == error_mark_node) 3332 initialized = 0; 3333 else if (COMPLETE_TYPE_P (TREE_TYPE (decl))) 3334 { 3335 /* A complete type is ok if size is fixed. */ 3336 3337 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST 3338 || C_DECL_VARIABLE_SIZE (decl)) 3339 { 3340 error ("variable-sized object may not be initialized"); 3341 initialized = 0; 3342 } 3343 } 3344 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE) 3345 { 3346 error ("variable %qD has initializer but incomplete type", decl); 3347 initialized = 0; 3348 } 3349 else if (C_DECL_VARIABLE_SIZE (decl)) 3350 { 3351 /* Although C99 is unclear about whether incomplete arrays 3352 of VLAs themselves count as VLAs, it does not make 3353 sense to permit them to be initialized given that 3354 ordinary VLAs may not be initialized. */ 3355 error ("variable-sized object may not be initialized"); 3356 initialized = 0; 3357 } 3358 } 3359 3360 if (initialized) 3361 { 3362 if (current_scope == file_scope) 3363 TREE_STATIC (decl) = 1; 3364 3365 /* Tell 'pushdecl' this is an initialized decl 3366 even though we don't yet have the initializer expression. 3367 Also tell 'finish_decl' it may store the real initializer. */ 3368 DECL_INITIAL (decl) = error_mark_node; 3369 } 3370 3371 /* If this is a function declaration, write a record describing it to the 3372 prototypes file (if requested). */ 3373 3374 if (TREE_CODE (decl) == FUNCTION_DECL) 3375 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0); 3376 3377 /* ANSI specifies that a tentative definition which is not merged with 3378 a non-tentative definition behaves exactly like a definition with an 3379 initializer equal to zero. (Section 3.7.2) 3380 3381 -fno-common gives strict ANSI behavior, though this tends to break 3382 a large body of code that grew up without this rule. 3383 3384 Thread-local variables are never common, since there's no entrenched 3385 body of code to break, and it allows more efficient variable references 3386 in the presence of dynamic linking. */ 3387 3388 if (TREE_CODE (decl) == VAR_DECL 3389 && !initialized 3390 && TREE_PUBLIC (decl) 3391 && !DECL_THREAD_LOCAL_P (decl) 3392 && !flag_no_common) 3393 DECL_COMMON (decl) = 1; 3394 3395 /* Set attributes here so if duplicate decl, will have proper attributes. */ 3396 decl_attributes (&decl, attributes, 0); 3397 3398 /* Handle gnu_inline attribute. */ 3399 if (declspecs->inline_p 3400 && !flag_gnu89_inline 3401 && TREE_CODE (decl) == FUNCTION_DECL 3402 && lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl))) 3403 { 3404 if (declspecs->storage_class == csc_auto && current_scope != file_scope) 3405 ; 3406 else if (declspecs->storage_class != csc_static) 3407 DECL_EXTERNAL (decl) = !DECL_EXTERNAL (decl); 3408 } 3409 3410 if (TREE_CODE (decl) == FUNCTION_DECL 3411 && targetm.calls.promote_prototypes (TREE_TYPE (decl))) 3412 { 3413 struct c_declarator *ce = declarator; 3414 3415 if (ce->kind == cdk_pointer) 3416 ce = declarator->declarator; 3417 if (ce->kind == cdk_function) 3418 { 3419 tree args = ce->u.arg_info->parms; 3420 for (; args; args = TREE_CHAIN (args)) 3421 { 3422 tree type = TREE_TYPE (args); 3423 if (type && INTEGRAL_TYPE_P (type) 3424 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node)) 3425 DECL_ARG_TYPE (args) = integer_type_node; 3426 } 3427 } 3428 } 3429 3430 if (TREE_CODE (decl) == FUNCTION_DECL 3431 && DECL_DECLARED_INLINE_P (decl) 3432 && DECL_UNINLINABLE (decl) 3433 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl))) 3434 warning (OPT_Wattributes, "inline function %q+D given attribute noinline", 3435 decl); 3436 3437 /* C99 6.7.4p3: An inline definition of a function with external 3438 linkage shall not contain a definition of a modifiable object 3439 with static storage duration... */ 3440 if (TREE_CODE (decl) == VAR_DECL 3441 && current_scope != file_scope 3442 && TREE_STATIC (decl) 3443 && !TREE_READONLY (decl) 3444 && DECL_DECLARED_INLINE_P (current_function_decl) 3445 && DECL_EXTERNAL (current_function_decl)) 3446 pedwarn ("%q+D is static but declared in inline function %qD " 3447 "which is not static", decl, current_function_decl); 3448 3449 /* Add this decl to the current scope. 3450 TEM may equal DECL or it may be a previous decl of the same name. */ 3451 tem = pushdecl (decl); 3452 3453 if (initialized && DECL_EXTERNAL (tem)) 3454 { 3455 DECL_EXTERNAL (tem) = 0; 3456 TREE_STATIC (tem) = 1; 3457 } 3458 3459 return tem; 3460} 3461 3462/* Initialize EH if not initialized yet and exceptions are enabled. */ 3463 3464void 3465c_maybe_initialize_eh (void) 3466{ 3467 if (!flag_exceptions || c_eh_initialized_p) 3468 return; 3469 3470 c_eh_initialized_p = true; 3471 eh_personality_libfunc 3472 = init_one_libfunc (USING_SJLJ_EXCEPTIONS 3473 ? "__gcc_personality_sj0" 3474 : "__gcc_personality_v0"); 3475 default_init_unwind_resume_libfunc (); 3476 using_eh_for_cleanups (); 3477} 3478 3479/* APPLE LOCAL begin radar 5932809 - copyable byref blocks (C++ cr) */ 3480#define BLOCK_ALIGN_MAX 18 3481static tree block_byref_id_object_copy[BLOCK_BYREF_CURRENT_MAX*(BLOCK_ALIGN_MAX+1)]; 3482static tree block_byref_id_object_dispose[BLOCK_BYREF_CURRENT_MAX*(BLOCK_ALIGN_MAX+1)]; 3483 3484/** 3485 This routine builds: 3486 3487 void __Block_byref_id_object_copy(struct Block_byref_id_object *dst, 3488 struct Block_byref_id_object *src) { 3489 _Block_object_assign (&_dest->object, _src->object, BLOCK_FIELD_IS_OBJECT[|BLOCK_FIELD_IS_WEAK]) // objects 3490 _Block_object_assign(&_dest->object, _src->object, BLOCK_FIELD_IS_BLOCK[|BLOCK_FIELD_IS_WEAK]) // blocks 3491 } */ 3492static void 3493synth_block_byref_id_object_copy_func (int flag, int kind) 3494{ 3495 tree stmt, fnbody; 3496 tree dst_arg, src_arg; 3497 tree dst_obj, src_obj; 3498 struct c_arg_info * arg_info; 3499 tree call_exp; 3500 gcc_assert (block_byref_id_object_copy[kind]); 3501 /* Set up: (void* _dest, void*_src) parameters. */ 3502 dst_arg = build_decl (PARM_DECL, get_identifier ("_dst"), 3503 ptr_type_node); 3504 TREE_USED (dst_arg) = 1; 3505 DECL_ARG_TYPE (dst_arg) = ptr_type_node; 3506 src_arg = build_decl (PARM_DECL, get_identifier ("_src"), 3507 ptr_type_node); 3508 TREE_USED (src_arg) = 1; 3509 DECL_ARG_TYPE (src_arg) = ptr_type_node; 3510 arg_info = xcalloc (1, sizeof (struct c_arg_info)); 3511 TREE_CHAIN (dst_arg) = src_arg; 3512 arg_info->parms = dst_arg; 3513 arg_info->types = tree_cons (NULL_TREE, ptr_type_node, 3514 tree_cons (NULL_TREE, 3515 ptr_type_node, 3516 NULL_TREE)); 3517 /* function header synthesis. */ 3518 push_function_context (); 3519 start_block_helper_function (block_byref_id_object_copy[kind]); 3520 store_parm_decls_from (arg_info); 3521 3522 /* Body of the function. */ 3523 stmt = c_begin_compound_stmt (true); 3524 /* Build dst->object */ 3525 dst_obj = build_indirect_object_id_exp (dst_arg); 3526 3527 3528 /* src_obj is: _src->object. */ 3529 src_obj = build_indirect_object_id_exp (src_arg); 3530 3531 /* APPLE LOCAL begin radar 6180456 */ 3532 /* _Block_object_assign (&_dest->object, _src->object, BLOCK_FIELD_IS_OBJECT) or : 3533 _Block_object_assign (&_dest->object, _src->object, BLOCK_FIELD_IS_BLOCK) */ 3534 /* APPLE LOCAL begin radar 6573923 */ 3535 /* Also add the new flag when calling _Block_object_dispose 3536 from byref dispose helper. */ 3537 flag |= BLOCK_BYREF_CALLER; 3538 /* APPLE LOCAL end radar 6573923 */ 3539 call_exp = build_block_object_assign_call_exp (build_fold_addr_expr (dst_obj), src_obj, flag); 3540 add_stmt (call_exp); 3541 /* APPLE LOCAL end radar 6180456 */ 3542 3543 fnbody = c_end_compound_stmt (stmt, true); 3544 add_stmt (fnbody); 3545 finish_function (); 3546 pop_function_context (); 3547 free (arg_info); 3548} 3549 3550/** 3551 This routine builds: 3552 3553 void __Block_byref_id_object_dispose(struct Block_byref_id_object *_src) { 3554 _Block_object_dispose(_src->object, BLOCK_FIELD_IS_OBJECT[|BLOCK_FIELD_IS_WEAK]) // object 3555 _Block_object_dispose(_src->object, BLOCK_FIELD_IS_BLOCK[|BLOCK_FIELD_IS_WEAK]) // block 3556 } */ 3557static void 3558synth_block_byref_id_object_dispose_func (int flag, int kind) 3559{ 3560 tree stmt, fnbody; 3561 tree src_arg, src_obj, rel_exp; 3562 struct c_arg_info * arg_info; 3563 gcc_assert (block_byref_id_object_dispose[kind]); 3564 /* Set up: (void *_src) parameter. */ 3565 src_arg = build_decl (PARM_DECL, get_identifier ("_src"), 3566 ptr_type_node); 3567 TREE_USED (src_arg) = 1; 3568 DECL_ARG_TYPE (src_arg) = ptr_type_node; 3569 arg_info = xcalloc (1, sizeof (struct c_arg_info)); 3570 arg_info->parms = src_arg; 3571 arg_info->types = tree_cons (NULL_TREE, ptr_type_node, 3572 NULL_TREE); 3573 /* function header synthesis. */ 3574 push_function_context (); 3575 start_block_helper_function (block_byref_id_object_dispose[kind]); 3576 store_parm_decls_from (arg_info); 3577 3578 /* Body of the function. */ 3579 stmt = c_begin_compound_stmt (true); 3580 src_obj = build_indirect_object_id_exp (src_arg); 3581 3582 /* APPLE LOCAL begin radar 6180456 */ 3583 /* _Block_object_dispose(_src->object, BLOCK_FIELD_IS_OBJECT) : or 3584 _Block_object_dispose(_src->object, BLOCK_FIELD_IS_BLOCK) */ 3585 /* APPLE LOCAL begin radar 6573923 */ 3586 /* Also add the new flag when calling _Block_object_dispose 3587 from byref dispose helper. */ 3588 flag |= BLOCK_BYREF_CALLER; 3589 /* APPLE LOCAL end radar 6573923 */ 3590 rel_exp = build_block_object_dispose_call_exp (src_obj, flag); 3591 /* APPLE LOCAL end radar 6180456 */ 3592 add_stmt (rel_exp); 3593 3594 fnbody = c_end_compound_stmt (stmt, true); 3595 add_stmt (fnbody); 3596 finish_function (); 3597 pop_function_context (); 3598 free (arg_info); 3599} 3600 3601/* new_block_byref_decl - This routine changes a 'typex x' declared variable into: 3602 3603 struct __Block_byref_x { 3604 // APPLE LOCAL radar 6244520 3605 void *__isa; // NULL for everything except __weak pointers 3606 struct Block_byref_x *__forwarding; 3607 int32_t __flags; 3608 int32_t __size; 3609 void *__ByrefKeepFuncPtr; // Only if variable is __block ObjC object 3610 void *__ByrefDestroyFuncPtr; // Only if variable is __block ObjC object 3611 typex x; 3612 } x; 3613*/ 3614 3615static tree 3616new_block_byref_decl (tree decl) 3617{ 3618 static int unique_count; 3619 /* APPLE LOCAL radar 5847976 */ 3620 int save_flag_objc_gc; 3621 tree Block_byref_type; 3622 tree field_decl_chain, field_decl; 3623 const char *prefix = "__Block_byref_"; 3624 char *string = alloca (strlen (IDENTIFIER_POINTER (DECL_NAME (decl))) + 3625 strlen (prefix) + 8 /* to hold the count */); 3626 3627 sprintf (string, "%s%d_%s", prefix, ++unique_count, 3628 IDENTIFIER_POINTER (DECL_NAME (decl))); 3629 3630 push_to_top_level (); 3631 Block_byref_type = start_struct (RECORD_TYPE, get_identifier (string)); 3632 3633 /* APPLE LOCAL begin radar 6244520 */ 3634 /* void *__isa; */ 3635 field_decl = build_decl (FIELD_DECL, get_identifier ("__isa"), ptr_type_node); 3636 field_decl_chain = field_decl; 3637 /* APPLE LOCAL end radar 6244520 */ 3638 3639 /* struct Block_byref_x *__forwarding; */ 3640 field_decl = build_decl (FIELD_DECL, get_identifier ("__forwarding"), 3641 build_pointer_type (Block_byref_type)); 3642 /* APPLE LOCAL radar 6244520 */ 3643 chainon (field_decl_chain, field_decl); 3644 3645 /* int32_t __flags; */ 3646 field_decl = build_decl (FIELD_DECL, get_identifier ("__flags"), 3647 unsigned_type_node); 3648 chainon (field_decl_chain, field_decl); 3649 3650 /* int32_t __size; */ 3651 field_decl = build_decl (FIELD_DECL, get_identifier ("__size"), 3652 unsigned_type_node); 3653 chainon (field_decl_chain, field_decl); 3654 3655 if (COPYABLE_BYREF_LOCAL_NONPOD (decl)) 3656 { 3657 /* void *__ByrefKeepFuncPtr; */ 3658 field_decl = build_decl (FIELD_DECL, get_identifier ("__ByrefKeepFuncPtr"), 3659 ptr_type_node); 3660 chainon (field_decl_chain, field_decl); 3661 3662 /* void *__ByrefDestroyFuncPtr; */ 3663 field_decl = build_decl (FIELD_DECL, get_identifier ("__ByrefDestroyFuncPtr"), 3664 ptr_type_node); 3665 chainon (field_decl_chain, field_decl); 3666 } 3667 3668 /* typex x; */ 3669 field_decl = build_decl (FIELD_DECL, DECL_NAME (decl), TREE_TYPE (decl)); 3670 chainon (field_decl_chain, field_decl); 3671 3672 pop_from_top_level (); 3673 /* APPLE LOCAL begin radar 5847976 */ 3674 /* Hack so we don't issue warning on a field_decl having __weak attribute */ 3675 save_flag_objc_gc = flag_objc_gc; 3676 flag_objc_gc = 0; 3677 finish_struct (Block_byref_type, field_decl_chain, NULL_TREE); 3678 flag_objc_gc = save_flag_objc_gc; 3679 /* APPLE LOCAL end radar 5847976 */ 3680 3681 TREE_TYPE (decl) = Block_byref_type; 3682 /* Force layout_decl to recompute these fields. */ 3683 DECL_SIZE (decl) = DECL_SIZE_UNIT (decl) = 0; 3684 layout_decl (decl, 0); 3685 return decl; 3686} 3687 3688/* init_byref_decl - This routine builds the initializer for the __Block_byref_x 3689 type in the form of: 3690 { NULL, &x, 0, sizeof(struct __Block_byref_x), initializer-expr}; 3691 3692 or: 3693 { NULL, &x, 0, sizeof(struct __Block_byref_x)}; 3694 when INIT is NULL_TREE 3695 3696 For __block ObjC objects, it also adds "byref_keep" and "byref_destroy" 3697 Funtion pointers. So the most general initializers would be: 3698 3699 { NULL, &x, 0, sizeof(struct __Block_byref_x), &byref_keep, &byref_destroy, 3700 &initializer-expr}; 3701*/ 3702static tree 3703/* APPLE LOCAL radar 5847976 */ 3704init_byref_decl (tree decl, tree init, int flag) 3705{ 3706 tree initlist; 3707 tree block_byref_type = TREE_TYPE (decl); 3708 int size = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (block_byref_type)); 3709 unsigned flags = 0; 3710 tree fields; 3711 3712 if (COPYABLE_BYREF_LOCAL_NONPOD (decl)) 3713 flags = BLOCK_HAS_COPY_DISPOSE; 3714 3715 fields = TYPE_FIELDS (block_byref_type); 3716 /* APPLE LOCAL begin radar 6244520 */ 3717 /* APPLE LOCAL begin radar 5847976 */ 3718 initlist = tree_cons (fields, fold_convert (ptr_type_node, ((flag & BLOCK_FIELD_IS_WEAK) != 0) ? integer_one_node 3719 : integer_zero_node), 0); 3720 /* APPLE LOCAL end radar 5847976 */ 3721 fields = TREE_CHAIN (fields); 3722 3723 initlist = tree_cons (fields, 3724 build_unary_op (ADDR_EXPR, decl, 0), initlist); 3725 /* APPLE LOCAL end radar 6244520 */ 3726 fields = TREE_CHAIN (fields); 3727 3728 initlist = tree_cons (fields, build_int_cst (TREE_TYPE (fields), flags), 3729 initlist); 3730 fields = TREE_CHAIN (fields); 3731 initlist = tree_cons (fields, build_int_cst (TREE_TYPE (fields), size), 3732 initlist); 3733 fields = TREE_CHAIN (fields); 3734 3735 if (COPYABLE_BYREF_LOCAL_NONPOD (decl)) 3736 { 3737 char name[64]; 3738 int align = exact_log2 ((DECL_ALIGN (decl)+TYPE_ALIGN (ptr_type_node)-1) / TYPE_ALIGN (ptr_type_node)); 3739 int kind; 3740 if (align == -1 || align > BLOCK_ALIGN_MAX) { 3741 error ("invalid alignment for __block variable"); 3742 kind = 0; 3743 } else 3744 kind = align*BLOCK_BYREF_CURRENT_MAX + flag; 3745 /* Add &__Block_byref_id_object_copy, &__Block_byref_id_object_dispose 3746 initializers. */ 3747 if (!block_byref_id_object_copy[kind]) 3748 { 3749 /* Build a void __Block_byref_id_object_copy(void*, void*) type. */ 3750 tree func_type = 3751 build_function_type (void_type_node, 3752 tree_cons (NULL_TREE, ptr_type_node, 3753 tree_cons (NULL_TREE, ptr_type_node, 3754 void_list_node))); 3755 sprintf (name, "__Block_byref_id_object_copy%d", kind); 3756 block_byref_id_object_copy[kind] = build_helper_func_decl (get_identifier (name), 3757 func_type); 3758 /* Synthesize function definition. */ 3759 synth_block_byref_id_object_copy_func (flag, kind); 3760 } 3761 initlist = tree_cons (fields, 3762 build_fold_addr_expr (block_byref_id_object_copy[kind]), 3763 initlist); 3764 fields = TREE_CHAIN (fields); 3765 3766 if (!block_byref_id_object_dispose[kind]) 3767 { 3768 /* Synthesize void __Block_byref_id_object_dispose (void*) and 3769 build &__Block_byref_id_object_dispose. */ 3770 tree func_type = 3771 build_function_type (void_type_node, 3772 tree_cons (NULL_TREE, ptr_type_node, void_list_node)); 3773 sprintf (name, "__Block_byref_id_object_dispose%d", kind); 3774 block_byref_id_object_dispose[kind] = build_helper_func_decl (get_identifier (name), 3775 func_type); 3776 /* Synthesize function definition. */ 3777 synth_block_byref_id_object_dispose_func (flag, kind); 3778 } 3779 initlist = tree_cons (fields, 3780 build_fold_addr_expr (block_byref_id_object_dispose[kind]), 3781 initlist); 3782 fields = TREE_CHAIN (fields); 3783 } 3784 3785 if (init) 3786 { 3787 init = do_digest_init (TREE_TYPE (fields), init); 3788 initlist = tree_cons (fields, init, initlist); 3789 } 3790 init = build_constructor_from_list (block_byref_type, nreverse (initlist)); 3791 return init; 3792} 3793/* APPLE LOCAL end radar 5932809 - copyable byref blocks (C++ cr) */ 3794 3795/* Finish processing of a declaration; 3796 install its initial value. 3797 If the length of an array type is not known before, 3798 it must be determined now, from the initial value, or it is an error. */ 3799 3800void 3801finish_decl (tree decl, tree init, tree asmspec_tree) 3802{ 3803 tree type; 3804 int was_incomplete = (DECL_SIZE (decl) == 0); 3805 const char *asmspec = 0; 3806 3807 /* If a name was specified, get the string. */ 3808 if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL) 3809 && DECL_FILE_SCOPE_P (decl)) 3810 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree); 3811 if (asmspec_tree) 3812 asmspec = TREE_STRING_POINTER (asmspec_tree); 3813 3814 /* If `start_decl' didn't like having an initialization, ignore it now. */ 3815 if (init != 0 && DECL_INITIAL (decl) == 0) 3816 init = 0; 3817 3818 /* Don't crash if parm is initialized. */ 3819 if (TREE_CODE (decl) == PARM_DECL) 3820 init = 0; 3821 /* APPLE LOCAL begin radar 5932809 - copyable byref blocks (C++ cq) */ 3822 /* We build a new type for each local variable declared as __block 3823 and initialize it to a list of initializers. */ 3824 else if (TREE_CODE (decl) == VAR_DECL && COPYABLE_BYREF_LOCAL_VAR (decl)) 3825 { 3826 if (DECL_EXTERNAL (decl) || TREE_STATIC (decl)) 3827 { 3828 error ("__block attribute on %q+D not allowed, only allowed on local variables", decl); 3829 COPYABLE_BYREF_LOCAL_VAR (decl) = 0; 3830 COPYABLE_BYREF_LOCAL_NONPOD (decl) = 0; 3831 } 3832 else 3833 { 3834 int flag = 0; 3835 if (objc_is_gcable_type (TREE_TYPE (decl)) == -1) 3836 flag = BLOCK_FIELD_IS_WEAK; 3837 if (block_requires_copying (decl)) 3838 { 3839 if (TREE_CODE (TREE_TYPE (decl)) == BLOCK_POINTER_TYPE) 3840 flag |= BLOCK_FIELD_IS_BLOCK; 3841 else 3842 flag |= BLOCK_FIELD_IS_OBJECT; 3843 } 3844 decl = new_block_byref_decl (decl); 3845 /* APPLE LOCAL begin radar 6289031 */ 3846#if 0 3847 if (! flag_objc_gc_only) 3848#endif 3849 { 3850 push_cleanup (decl, build_block_byref_release_exp (decl), false); 3851 } 3852 /* APPLE LOCAL end radar 6289031 */ 3853 /* APPLE LOCAL begin radar 5847976 */ 3854 COPYABLE_WEAK_BLOCK (decl) = ((flag & BLOCK_FIELD_IS_WEAK) != 0); 3855 init = init_byref_decl (decl, init, flag); 3856 /* APPLE LOCAL end radar 5847976 */ 3857 } 3858 } 3859 /* APPLE LOCAL end radar 5932809 - copyable byref blocks (C++ cq) */ 3860 3861 if (init) 3862 store_init_value (decl, init); 3863 3864 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL 3865 || TREE_CODE (decl) == FUNCTION_DECL 3866 || TREE_CODE (decl) == FIELD_DECL)) 3867 objc_check_decl (decl); 3868 3869 type = TREE_TYPE (decl); 3870 3871 /* Deduce size of array from initialization, if not already known. */ 3872 if (TREE_CODE (type) == ARRAY_TYPE 3873 && TYPE_DOMAIN (type) == 0 3874 && TREE_CODE (decl) != TYPE_DECL) 3875 { 3876 bool do_default 3877 = (TREE_STATIC (decl) 3878 /* Even if pedantic, an external linkage array 3879 may have incomplete type at first. */ 3880 ? pedantic && !TREE_PUBLIC (decl) 3881 : !DECL_EXTERNAL (decl)); 3882 int failure 3883 = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl), 3884 do_default); 3885 3886 /* Get the completed type made by complete_array_type. */ 3887 type = TREE_TYPE (decl); 3888 3889 switch (failure) 3890 { 3891 case 1: 3892 error ("initializer fails to determine size of %q+D", decl); 3893 break; 3894 3895 case 2: 3896 if (do_default) 3897 error ("array size missing in %q+D", decl); 3898 /* If a `static' var's size isn't known, 3899 make it extern as well as static, so it does not get 3900 allocated. 3901 If it is not `static', then do not mark extern; 3902 finish_incomplete_decl will give it a default size 3903 and it will get allocated. */ 3904 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl)) 3905 DECL_EXTERNAL (decl) = 1; 3906 break; 3907 3908 case 3: 3909 error ("zero or negative size array %q+D", decl); 3910 break; 3911 3912 case 0: 3913 /* For global variables, update the copy of the type that 3914 exists in the binding. */ 3915 if (TREE_PUBLIC (decl)) 3916 { 3917 struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl)); 3918 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext)) 3919 b_ext = b_ext->shadowed; 3920 if (b_ext) 3921 { 3922 if (b_ext->type) 3923 b_ext->type = composite_type (b_ext->type, type); 3924 else 3925 b_ext->type = type; 3926 } 3927 } 3928 break; 3929 3930 default: 3931 gcc_unreachable (); 3932 } 3933 3934 if (DECL_INITIAL (decl)) 3935 TREE_TYPE (DECL_INITIAL (decl)) = type; 3936 3937 layout_decl (decl, 0); 3938 } 3939 3940 if (TREE_CODE (decl) == VAR_DECL) 3941 { 3942 if (init && TREE_CODE (init) == CONSTRUCTOR) 3943 add_flexible_array_elts_to_size (decl, init); 3944 3945 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node 3946 && COMPLETE_TYPE_P (TREE_TYPE (decl))) 3947 layout_decl (decl, 0); 3948 3949 if (DECL_SIZE (decl) == 0 3950 /* Don't give an error if we already gave one earlier. */ 3951 && TREE_TYPE (decl) != error_mark_node 3952 && (TREE_STATIC (decl) 3953 /* A static variable with an incomplete type 3954 is an error if it is initialized. 3955 Also if it is not file scope. 3956 Otherwise, let it through, but if it is not `extern' 3957 then it may cause an error message later. */ 3958 ? (DECL_INITIAL (decl) != 0 3959 || !DECL_FILE_SCOPE_P (decl)) 3960 /* An automatic variable with an incomplete type 3961 is an error. */ 3962 : !DECL_EXTERNAL (decl))) 3963 { 3964 error ("storage size of %q+D isn%'t known", decl); 3965 TREE_TYPE (decl) = error_mark_node; 3966 } 3967 3968 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl)) 3969 && DECL_SIZE (decl) != 0) 3970 { 3971 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST) 3972 constant_expression_warning (DECL_SIZE (decl)); 3973 else 3974 error ("storage size of %q+D isn%'t constant", decl); 3975 } 3976 3977 if (TREE_USED (type)) 3978 TREE_USED (decl) = 1; 3979 } 3980 3981 /* If this is a function and an assembler name is specified, reset DECL_RTL 3982 so we can give it its new name. Also, update built_in_decls if it 3983 was a normal built-in. */ 3984 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec) 3985 { 3986 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL) 3987 set_builtin_user_assembler_name (decl, asmspec); 3988 set_user_assembler_name (decl, asmspec); 3989 } 3990 3991 /* If #pragma weak was used, mark the decl weak now. */ 3992 maybe_apply_pragma_weak (decl); 3993 3994 /* Output the assembler code and/or RTL code for variables and functions, 3995 unless the type is an undefined structure or union. 3996 If not, it will get done when the type is completed. */ 3997 3998 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL) 3999 { 4000 /* Determine the ELF visibility. */ 4001 if (TREE_PUBLIC (decl)) 4002 c_determine_visibility (decl); 4003 4004 /* This is a no-op in c-lang.c or something real in objc-act.c. */ 4005 if (c_dialect_objc ()) 4006 objc_check_decl (decl); 4007 4008 if (asmspec) 4009 { 4010 /* If this is not a static variable, issue a warning. 4011 It doesn't make any sense to give an ASMSPEC for an 4012 ordinary, non-register local variable. Historically, 4013 GCC has accepted -- but ignored -- the ASMSPEC in 4014 this case. */ 4015 if (!DECL_FILE_SCOPE_P (decl) 4016 && TREE_CODE (decl) == VAR_DECL 4017 && !C_DECL_REGISTER (decl) 4018 && !TREE_STATIC (decl)) 4019 warning (0, "ignoring asm-specifier for non-static local " 4020 "variable %q+D", decl); 4021 else 4022 set_user_assembler_name (decl, asmspec); 4023 } 4024 4025 if (DECL_FILE_SCOPE_P (decl)) 4026 { 4027 if (DECL_INITIAL (decl) == NULL_TREE 4028 || DECL_INITIAL (decl) == error_mark_node) 4029 /* Don't output anything 4030 when a tentative file-scope definition is seen. 4031 But at end of compilation, do output code for them. */ 4032 DECL_DEFER_OUTPUT (decl) = 1; 4033 rest_of_decl_compilation (decl, true, 0); 4034 } 4035 else 4036 { 4037 /* In conjunction with an ASMSPEC, the `register' 4038 keyword indicates that we should place the variable 4039 in a particular register. */ 4040 if (asmspec && C_DECL_REGISTER (decl)) 4041 { 4042 DECL_HARD_REGISTER (decl) = 1; 4043 /* This cannot be done for a structure with volatile 4044 fields, on which DECL_REGISTER will have been 4045 reset. */ 4046 if (!DECL_REGISTER (decl)) 4047 error ("cannot put object with volatile field into register"); 4048 } 4049 4050 if (TREE_CODE (decl) != FUNCTION_DECL) 4051 { 4052 /* If we're building a variable sized type, and we might be 4053 reachable other than via the top of the current binding 4054 level, then create a new BIND_EXPR so that we deallocate 4055 the object at the right time. */ 4056 /* Note that DECL_SIZE can be null due to errors. */ 4057 if (DECL_SIZE (decl) 4058 && !TREE_CONSTANT (DECL_SIZE (decl)) 4059 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list)) 4060 { 4061 tree bind; 4062 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL); 4063 TREE_SIDE_EFFECTS (bind) = 1; 4064 add_stmt (bind); 4065 BIND_EXPR_BODY (bind) = push_stmt_list (); 4066 } 4067 add_stmt (build_stmt (DECL_EXPR, decl)); 4068 } 4069 } 4070 4071 4072 if (!DECL_FILE_SCOPE_P (decl)) 4073 { 4074 /* Recompute the RTL of a local array now 4075 if it used to be an incomplete type. */ 4076 if (was_incomplete 4077 && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl)) 4078 { 4079 /* If we used it already as memory, it must stay in memory. */ 4080 TREE_ADDRESSABLE (decl) = TREE_USED (decl); 4081 /* If it's still incomplete now, no init will save it. */ 4082 if (DECL_SIZE (decl) == 0) 4083 DECL_INITIAL (decl) = 0; 4084 } 4085 } 4086 } 4087 4088 /* If this was marked 'used', be sure it will be output. */ 4089 if (!flag_unit_at_a_time && lookup_attribute ("used", DECL_ATTRIBUTES (decl))) 4090 mark_decl_referenced (decl); 4091 4092 if (TREE_CODE (decl) == TYPE_DECL) 4093 { 4094 if (!DECL_FILE_SCOPE_P (decl) 4095 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE)) 4096 add_stmt (build_stmt (DECL_EXPR, decl)); 4097 4098 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0); 4099 } 4100 4101 /* At the end of a declaration, throw away any variable type sizes 4102 of types defined inside that declaration. There is no use 4103 computing them in the following function definition. */ 4104 if (current_scope == file_scope) 4105 get_pending_sizes (); 4106 4107 /* Install a cleanup (aka destructor) if one was given. */ 4108 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl)) 4109 { 4110 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl)); 4111 if (attr) 4112 { 4113 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr)); 4114 tree cleanup_decl = lookup_name (cleanup_id); 4115 tree cleanup; 4116 4117 /* Build "cleanup(&decl)" for the destructor. */ 4118 cleanup = build_unary_op (ADDR_EXPR, decl, 0); 4119 cleanup = build_tree_list (NULL_TREE, cleanup); 4120 cleanup = build_function_call (cleanup_decl, cleanup); 4121 4122 /* Don't warn about decl unused; the cleanup uses it. */ 4123 TREE_USED (decl) = 1; 4124 TREE_USED (cleanup_decl) = 1; 4125 4126 /* Initialize EH, if we've been told to do so. */ 4127 c_maybe_initialize_eh (); 4128 4129 push_cleanup (decl, cleanup, false); 4130 } 4131 } 4132} 4133 4134/* Given a parsed parameter declaration, decode it into a PARM_DECL. */ 4135 4136tree 4137grokparm (const struct c_parm *parm) 4138{ 4139 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, 4140 NULL); 4141 4142 decl_attributes (&decl, parm->attrs, 0); 4143 4144 return decl; 4145} 4146 4147/* Given a parsed parameter declaration, decode it into a PARM_DECL 4148 and push that on the current scope. */ 4149 4150void 4151push_parm_decl (const struct c_parm *parm) 4152{ 4153 tree decl; 4154 4155 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL); 4156 decl_attributes (&decl, parm->attrs, 0); 4157 4158 decl = pushdecl (decl); 4159 4160 finish_decl (decl, NULL_TREE, NULL_TREE); 4161} 4162 4163/* Mark all the parameter declarations to date as forward decls. 4164 Also diagnose use of this extension. */ 4165 4166void 4167mark_forward_parm_decls (void) 4168{ 4169 struct c_binding *b; 4170 4171 if (pedantic && !current_scope->warned_forward_parm_decls) 4172 { 4173 pedwarn ("ISO C forbids forward parameter declarations"); 4174 current_scope->warned_forward_parm_decls = true; 4175 } 4176 4177 for (b = current_scope->bindings; b; b = b->prev) 4178 if (TREE_CODE (b->decl) == PARM_DECL) 4179 TREE_ASM_WRITTEN (b->decl) = 1; 4180} 4181 4182/* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound 4183 literal, which may be an incomplete array type completed by the 4184 initializer; INIT is a CONSTRUCTOR that initializes the compound 4185 literal. */ 4186 4187tree 4188build_compound_literal (tree type, tree init) 4189{ 4190 /* We do not use start_decl here because we have a type, not a declarator; 4191 and do not use finish_decl because the decl should be stored inside 4192 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */ 4193 tree decl; 4194 tree complit; 4195 tree stmt; 4196 4197 if (type == error_mark_node) 4198 return error_mark_node; 4199 4200 decl = build_decl (VAR_DECL, NULL_TREE, type); 4201 DECL_EXTERNAL (decl) = 0; 4202 TREE_PUBLIC (decl) = 0; 4203 TREE_STATIC (decl) = (current_scope == file_scope); 4204 DECL_CONTEXT (decl) = current_function_decl; 4205 TREE_USED (decl) = 1; 4206 TREE_TYPE (decl) = type; 4207 TREE_READONLY (decl) = TYPE_READONLY (type); 4208 store_init_value (decl, init); 4209 4210 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type)) 4211 { 4212 int failure = complete_array_type (&TREE_TYPE (decl), 4213 DECL_INITIAL (decl), true); 4214 gcc_assert (!failure); 4215 4216 type = TREE_TYPE (decl); 4217 TREE_TYPE (DECL_INITIAL (decl)) = type; 4218 } 4219 4220 if (type == error_mark_node || !COMPLETE_TYPE_P (type)) 4221 return error_mark_node; 4222 4223 stmt = build_stmt (DECL_EXPR, decl); 4224 complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt); 4225 TREE_SIDE_EFFECTS (complit) = 1; 4226 4227 layout_decl (decl, 0); 4228 4229 if (TREE_STATIC (decl)) 4230 { 4231 /* This decl needs a name for the assembler output. */ 4232 set_compound_literal_name (decl); 4233 DECL_DEFER_OUTPUT (decl) = 1; 4234 DECL_COMDAT (decl) = 1; 4235 DECL_ARTIFICIAL (decl) = 1; 4236 DECL_IGNORED_P (decl) = 1; 4237 pushdecl (decl); 4238 rest_of_decl_compilation (decl, 1, 0); 4239 } 4240 4241 return complit; 4242} 4243 4244/* Determine whether TYPE is a structure with a flexible array member, 4245 or a union containing such a structure (possibly recursively). */ 4246 4247static bool 4248flexible_array_type_p (tree type) 4249{ 4250 tree x; 4251 switch (TREE_CODE (type)) 4252 { 4253 case RECORD_TYPE: 4254 x = TYPE_FIELDS (type); 4255 if (x == NULL_TREE) 4256 return false; 4257 while (TREE_CHAIN (x) != NULL_TREE) 4258 x = TREE_CHAIN (x); 4259 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE 4260 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE 4261 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE 4262 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE) 4263 return true; 4264 return false; 4265 case UNION_TYPE: 4266 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x)) 4267 { 4268 if (flexible_array_type_p (TREE_TYPE (x))) 4269 return true; 4270 } 4271 return false; 4272 default: 4273 return false; 4274 } 4275} 4276 4277/* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME, 4278 replacing with appropriate values if they are invalid. */ 4279static void 4280check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name) 4281{ 4282 tree type_mv; 4283 unsigned int max_width; 4284 unsigned HOST_WIDE_INT w; 4285 const char *name = orig_name ? orig_name: _("<anonymous>"); 4286 4287 /* Detect and ignore out of range field width and process valid 4288 field widths. */ 4289 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width)) 4290 || TREE_CODE (*width) != INTEGER_CST) 4291 { 4292 error ("bit-field %qs width not an integer constant", name); 4293 *width = integer_one_node; 4294 } 4295 else 4296 { 4297 constant_expression_warning (*width); 4298 if (tree_int_cst_sgn (*width) < 0) 4299 { 4300 error ("negative width in bit-field %qs", name); 4301 *width = integer_one_node; 4302 } 4303 else if (integer_zerop (*width) && orig_name) 4304 { 4305 error ("zero width for bit-field %qs", name); 4306 *width = integer_one_node; 4307 } 4308 } 4309 4310 /* Detect invalid bit-field type. */ 4311 if (TREE_CODE (*type) != INTEGER_TYPE 4312 && TREE_CODE (*type) != BOOLEAN_TYPE 4313 && TREE_CODE (*type) != ENUMERAL_TYPE) 4314 { 4315 error ("bit-field %qs has invalid type", name); 4316 *type = unsigned_type_node; 4317 } 4318 4319 type_mv = TYPE_MAIN_VARIANT (*type); 4320 if (pedantic 4321 && !in_system_header 4322 && type_mv != integer_type_node 4323 && type_mv != unsigned_type_node 4324 && type_mv != boolean_type_node) 4325 pedwarn ("type of bit-field %qs is a GCC extension", name); 4326 4327 if (type_mv == boolean_type_node) 4328 max_width = CHAR_TYPE_SIZE; 4329 else 4330 max_width = TYPE_PRECISION (*type); 4331 4332 if (0 < compare_tree_int (*width, max_width)) 4333 { 4334 error ("width of %qs exceeds its type", name); 4335 w = max_width; 4336 *width = build_int_cst (NULL_TREE, w); 4337 } 4338 else 4339 w = tree_low_cst (*width, 1); 4340 4341 if (TREE_CODE (*type) == ENUMERAL_TYPE) 4342 { 4343 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type); 4344 if (!lt 4345 || w < min_precision (lt->enum_min, TYPE_UNSIGNED (*type)) 4346 || w < min_precision (lt->enum_max, TYPE_UNSIGNED (*type))) 4347 warning (0, "%qs is narrower than values of its type", name); 4348 } 4349} 4350 4351 4352 4353/* Print warning about variable length array if necessary. */ 4354 4355static void 4356warn_variable_length_array (const char *name, tree size) 4357{ 4358 int ped = !flag_isoc99 && pedantic && warn_vla != 0; 4359 int const_size = TREE_CONSTANT (size); 4360 4361 if (ped) 4362 { 4363 if (const_size) 4364 { 4365 if (name) 4366 pedwarn ("ISO C90 forbids array %qs whose size " 4367 "can%'t be evaluated", 4368 name); 4369 else 4370 pedwarn ("ISO C90 forbids array whose size " 4371 "can%'t be evaluated"); 4372 } 4373 else 4374 { 4375 if (name) 4376 pedwarn ("ISO C90 forbids variable length array %qs", 4377 name); 4378 else 4379 pedwarn ("ISO C90 forbids variable length array"); 4380 } 4381 } 4382 else if (warn_vla > 0) 4383 { 4384 if (const_size) 4385 { 4386 if (name) 4387 warning (OPT_Wvla, 4388 "the size of array %qs can" 4389 "%'t be evaluated", name); 4390 else 4391 warning (OPT_Wvla, 4392 "the size of array can %'t be evaluated"); 4393 } 4394 else 4395 { 4396 if (name) 4397 warning (OPT_Wvla, 4398 "variable length array %qs is used", 4399 name); 4400 else 4401 warning (OPT_Wvla, 4402 "variable length array is used"); 4403 } 4404 } 4405} 4406 4407/* Given declspecs and a declarator, 4408 determine the name and type of the object declared 4409 and construct a ..._DECL node for it. 4410 (In one case we can return a ..._TYPE node instead. 4411 For invalid input we sometimes return 0.) 4412 4413 DECLSPECS is a c_declspecs structure for the declaration specifiers. 4414 4415 DECL_CONTEXT says which syntactic context this declaration is in: 4416 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL. 4417 FUNCDEF for a function definition. Like NORMAL but a few different 4418 error messages in each case. Return value may be zero meaning 4419 this definition is too screwy to try to parse. 4420 PARM for a parameter declaration (either within a function prototype 4421 or before a function body). Make a PARM_DECL, or return void_type_node. 4422 TYPENAME if for a typename (in a cast or sizeof). 4423 Don't make a DECL node; just return the ..._TYPE node. 4424 FIELD for a struct or union field; make a FIELD_DECL. 4425 INITIALIZED is true if the decl has an initializer. 4426 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node 4427 representing the width of the bit-field. 4428 4429 In the TYPENAME case, DECLARATOR is really an absolute declarator. 4430 It may also be so in the PARM case, for a prototype where the 4431 argument type is specified but not the name. 4432 4433 This function is where the complicated C meanings of `static' 4434 and `extern' are interpreted. */ 4435 4436static tree 4437grokdeclarator (const struct c_declarator *declarator, 4438 struct c_declspecs *declspecs, 4439 enum decl_context decl_context, bool initialized, tree *width) 4440{ 4441 tree type = declspecs->type; 4442 bool threadp = declspecs->thread_p; 4443 enum c_storage_class storage_class = declspecs->storage_class; 4444 int constp; 4445 int restrictp; 4446 int volatilep; 4447 int type_quals = TYPE_UNQUALIFIED; 4448 const char *name, *orig_name; 4449 tree typedef_type = 0; 4450 bool funcdef_flag = false; 4451 bool funcdef_syntax = false; 4452 int size_varies = 0; 4453 tree decl_attr = declspecs->decl_attr; 4454 int array_ptr_quals = TYPE_UNQUALIFIED; 4455 tree array_ptr_attrs = NULL_TREE; 4456 int array_parm_static = 0; 4457 bool array_parm_vla_unspec_p = false; 4458 tree returned_attrs = NULL_TREE; 4459 bool bitfield = width != NULL; 4460 tree element_type; 4461 struct c_arg_info *arg_info = 0; 4462 4463 if (decl_context == FUNCDEF) 4464 funcdef_flag = true, decl_context = NORMAL; 4465 4466 /* Look inside a declarator for the name being declared 4467 and get it as a string, for an error message. */ 4468 { 4469 const struct c_declarator *decl = declarator; 4470 name = 0; 4471 4472 while (decl) 4473 switch (decl->kind) 4474 { 4475 case cdk_function: 4476 case cdk_array: 4477 case cdk_pointer: 4478 /* APPLE LOCAL radar 5732232 - blocks */ 4479 case cdk_block_pointer: 4480 funcdef_syntax = (decl->kind == cdk_function); 4481 decl = decl->declarator; 4482 break; 4483 4484 case cdk_attrs: 4485 decl = decl->declarator; 4486 break; 4487 4488 case cdk_id: 4489 if (decl->u.id) 4490 name = IDENTIFIER_POINTER (decl->u.id); 4491 decl = 0; 4492 break; 4493 4494 default: 4495 gcc_unreachable (); 4496 } 4497 orig_name = name; 4498 if (name == 0) 4499 name = "type name"; 4500 } 4501 4502 /* A function definition's declarator must have the form of 4503 a function declarator. */ 4504 4505 if (funcdef_flag && !funcdef_syntax) 4506 return 0; 4507 4508 /* If this looks like a function definition, make it one, 4509 even if it occurs where parms are expected. 4510 Then store_parm_decls will reject it and not use it as a parm. */ 4511 /* APPLE LOCAL begin "unavailable" attribute (radar 2809697) */ 4512 if (declspecs->unavailable_p) 4513 error_unavailable_use (declspecs->type); 4514 else 4515 /* APPLE LOCAL end "unavailable" attribute (radar 2809697) */ 4516 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag) 4517 decl_context = PARM; 4518 4519 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS) 4520 warn_deprecated_use (declspecs->type); 4521 4522 if ((decl_context == NORMAL || decl_context == FIELD) 4523 && current_scope == file_scope 4524 && variably_modified_type_p (type, NULL_TREE)) 4525 { 4526 error ("variably modified %qs at file scope", name); 4527 type = integer_type_node; 4528 } 4529 4530 typedef_type = type; 4531 size_varies = C_TYPE_VARIABLE_SIZE (type); 4532 4533 /* Diagnose defaulting to "int". */ 4534 4535 if (declspecs->default_int_p && !in_system_header) 4536 { 4537 /* Issue a warning if this is an ISO C 99 program or if 4538 -Wreturn-type and this is a function, or if -Wimplicit; 4539 prefer the former warning since it is more explicit. */ 4540 if ((warn_implicit_int || warn_return_type || flag_isoc99) 4541 && funcdef_flag) 4542 warn_about_return_type = 1; 4543 else if (warn_implicit_int || flag_isoc99) 4544 pedwarn_c99 ("type defaults to %<int%> in declaration of %qs", name); 4545 } 4546 4547 /* Adjust the type if a bit-field is being declared, 4548 -funsigned-bitfields applied and the type is not explicitly 4549 "signed". */ 4550 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p 4551 && TREE_CODE (type) == INTEGER_TYPE) 4552 type = c_common_unsigned_type (type); 4553 4554 /* Figure out the type qualifiers for the declaration. There are 4555 two ways a declaration can become qualified. One is something 4556 like `const int i' where the `const' is explicit. Another is 4557 something like `typedef const int CI; CI i' where the type of the 4558 declaration contains the `const'. A third possibility is that 4559 there is a type qualifier on the element type of a typedefed 4560 array type, in which case we should extract that qualifier so 4561 that c_apply_type_quals_to_decls receives the full list of 4562 qualifiers to work with (C90 is not entirely clear about whether 4563 duplicate qualifiers should be diagnosed in this case, but it 4564 seems most appropriate to do so). */ 4565 element_type = strip_array_types (type); 4566 constp = declspecs->const_p + TYPE_READONLY (element_type); 4567 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type); 4568 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type); 4569 if (pedantic && !flag_isoc99) 4570 { 4571 if (constp > 1) 4572 pedwarn ("duplicate %<const%>"); 4573 if (restrictp > 1) 4574 pedwarn ("duplicate %<restrict%>"); 4575 if (volatilep > 1) 4576 pedwarn ("duplicate %<volatile%>"); 4577 } 4578 if (!flag_gen_aux_info && (TYPE_QUALS (element_type))) 4579 type = TYPE_MAIN_VARIANT (type); 4580 type_quals = ((constp ? TYPE_QUAL_CONST : 0) 4581 | (restrictp ? TYPE_QUAL_RESTRICT : 0) 4582 | (volatilep ? TYPE_QUAL_VOLATILE : 0)); 4583 4584 /* Warn about storage classes that are invalid for certain 4585 kinds of declarations (parameters, typenames, etc.). */ 4586 4587 if (funcdef_flag 4588 && (threadp 4589 || storage_class == csc_auto 4590 || storage_class == csc_register 4591 || storage_class == csc_typedef)) 4592 { 4593 if (storage_class == csc_auto 4594 && (pedantic || current_scope == file_scope)) 4595 pedwarn ("function definition declared %<auto%>"); 4596 if (storage_class == csc_register) 4597 error ("function definition declared %<register%>"); 4598 if (storage_class == csc_typedef) 4599 error ("function definition declared %<typedef%>"); 4600 if (threadp) 4601 error ("function definition declared %<__thread%>"); 4602 threadp = false; 4603 if (storage_class == csc_auto 4604 || storage_class == csc_register 4605 || storage_class == csc_typedef) 4606 storage_class = csc_none; 4607 } 4608 else if (decl_context != NORMAL && (storage_class != csc_none || threadp)) 4609 { 4610 if (decl_context == PARM && storage_class == csc_register) 4611 ; 4612 else 4613 { 4614 switch (decl_context) 4615 { 4616 case FIELD: 4617 error ("storage class specified for structure field %qs", 4618 name); 4619 break; 4620 case PARM: 4621 error ("storage class specified for parameter %qs", name); 4622 break; 4623 default: 4624 error ("storage class specified for typename"); 4625 break; 4626 } 4627 storage_class = csc_none; 4628 threadp = false; 4629 } 4630 } 4631 else if (storage_class == csc_extern 4632 && initialized 4633 && !funcdef_flag) 4634 { 4635 /* 'extern' with initialization is invalid if not at file scope. */ 4636 if (current_scope == file_scope) 4637 { 4638 /* It is fine to have 'extern const' when compiling at C 4639 and C++ intersection. */ 4640 if (!(warn_cxx_compat && constp)) 4641 warning (0, "%qs initialized and declared %<extern%>", name); 4642 } 4643 else 4644 error ("%qs has both %<extern%> and initializer", name); 4645 } 4646 else if (current_scope == file_scope) 4647 { 4648 if (storage_class == csc_auto) 4649 error ("file-scope declaration of %qs specifies %<auto%>", name); 4650 if (pedantic && storage_class == csc_register) 4651 pedwarn ("file-scope declaration of %qs specifies %<register%>", name); 4652 } 4653 else 4654 { 4655 if (storage_class == csc_extern && funcdef_flag) 4656 error ("nested function %qs declared %<extern%>", name); 4657 else if (threadp && storage_class == csc_none) 4658 { 4659 error ("function-scope %qs implicitly auto and declared " 4660 "%<__thread%>", 4661 name); 4662 threadp = false; 4663 } 4664 } 4665 4666 /* Now figure out the structure of the declarator proper. 4667 Descend through it, creating more complex types, until we reach 4668 the declared identifier (or NULL_TREE, in an absolute declarator). 4669 At each stage we maintain an unqualified version of the type 4670 together with any qualifiers that should be applied to it with 4671 c_build_qualified_type; this way, array types including 4672 multidimensional array types are first built up in unqualified 4673 form and then the qualified form is created with 4674 TYPE_MAIN_VARIANT pointing to the unqualified form. */ 4675 4676 while (declarator && declarator->kind != cdk_id) 4677 { 4678 if (type == error_mark_node) 4679 { 4680 declarator = declarator->declarator; 4681 continue; 4682 } 4683 4684 /* Each level of DECLARATOR is either a cdk_array (for ...[..]), 4685 a cdk_pointer (for *...), 4686 a cdk_function (for ...(...)), 4687 a cdk_attrs (for nested attributes), 4688 or a cdk_id (for the name being declared 4689 or the place in an absolute declarator 4690 where the name was omitted). 4691 For the last case, we have just exited the loop. 4692 4693 At this point, TYPE is the type of elements of an array, 4694 or for a function to return, or for a pointer to point to. 4695 After this sequence of ifs, TYPE is the type of the 4696 array or function or pointer, and DECLARATOR has had its 4697 outermost layer removed. */ 4698 4699 if (array_ptr_quals != TYPE_UNQUALIFIED 4700 || array_ptr_attrs != NULL_TREE 4701 || array_parm_static) 4702 { 4703 /* Only the innermost declarator (making a parameter be of 4704 array type which is converted to pointer type) 4705 may have static or type qualifiers. */ 4706 error ("static or type qualifiers in non-parameter array declarator"); 4707 array_ptr_quals = TYPE_UNQUALIFIED; 4708 array_ptr_attrs = NULL_TREE; 4709 array_parm_static = 0; 4710 } 4711 4712 switch (declarator->kind) 4713 { 4714 case cdk_attrs: 4715 { 4716 /* A declarator with embedded attributes. */ 4717 tree attrs = declarator->u.attrs; 4718 const struct c_declarator *inner_decl; 4719 int attr_flags = 0; 4720 declarator = declarator->declarator; 4721 inner_decl = declarator; 4722 while (inner_decl->kind == cdk_attrs) 4723 inner_decl = inner_decl->declarator; 4724 if (inner_decl->kind == cdk_id) 4725 attr_flags |= (int) ATTR_FLAG_DECL_NEXT; 4726 else if (inner_decl->kind == cdk_function) 4727 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT; 4728 else if (inner_decl->kind == cdk_array) 4729 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT; 4730 returned_attrs = decl_attributes (&type, 4731 chainon (returned_attrs, attrs), 4732 attr_flags); 4733 break; 4734 } 4735 case cdk_array: 4736 { 4737 tree itype = NULL_TREE; 4738 tree size = declarator->u.array.dimen; 4739 /* The index is a signed object `sizetype' bits wide. */ 4740 tree index_type = c_common_signed_type (sizetype); 4741 4742 array_ptr_quals = declarator->u.array.quals; 4743 array_ptr_attrs = declarator->u.array.attrs; 4744 array_parm_static = declarator->u.array.static_p; 4745 array_parm_vla_unspec_p = declarator->u.array.vla_unspec_p; 4746 4747 declarator = declarator->declarator; 4748 4749 /* Check for some types that there cannot be arrays of. */ 4750 4751 if (VOID_TYPE_P (type)) 4752 { 4753 error ("declaration of %qs as array of voids", name); 4754 type = error_mark_node; 4755 } 4756 4757 if (TREE_CODE (type) == FUNCTION_TYPE) 4758 { 4759 error ("declaration of %qs as array of functions", name); 4760 type = error_mark_node; 4761 } 4762 4763 if (pedantic && !in_system_header && flexible_array_type_p (type)) 4764 pedwarn ("invalid use of structure with flexible array member"); 4765 4766 if (size == error_mark_node) 4767 type = error_mark_node; 4768 4769 if (type == error_mark_node) 4770 continue; 4771 4772 /* If size was specified, set ITYPE to a range-type for 4773 that size. Otherwise, ITYPE remains null. finish_decl 4774 may figure it out from an initial value. */ 4775 4776 if (size) 4777 { 4778 /* Strip NON_LVALUE_EXPRs since we aren't using as an 4779 lvalue. */ 4780 STRIP_TYPE_NOPS (size); 4781 4782 if (!INTEGRAL_TYPE_P (TREE_TYPE (size))) 4783 { 4784 error ("size of array %qs has non-integer type", name); 4785 size = integer_one_node; 4786 } 4787 4788 if (pedantic && integer_zerop (size)) 4789 pedwarn ("ISO C forbids zero-size array %qs", name); 4790 4791 if (TREE_CODE (size) == INTEGER_CST) 4792 { 4793 constant_expression_warning (size); 4794 if (tree_int_cst_sgn (size) < 0) 4795 { 4796 error ("size of array %qs is negative", name); 4797 size = integer_one_node; 4798 } 4799 } 4800 else if ((decl_context == NORMAL || decl_context == FIELD) 4801 && current_scope == file_scope) 4802 { 4803 error ("variably modified %qs at file scope", name); 4804 size = integer_one_node; 4805 } 4806 else 4807 { 4808 /* Make sure the array size remains visibly 4809 nonconstant even if it is (eg) a const variable 4810 with known value. */ 4811 size_varies = 1; 4812 warn_variable_length_array (orig_name, size); 4813 if (warn_variable_decl) 4814 warning (0, "variable-sized array %qs", name); 4815 } 4816 4817 if (integer_zerop (size)) 4818 { 4819 /* A zero-length array cannot be represented with 4820 an unsigned index type, which is what we'll 4821 get with build_index_type. Create an 4822 open-ended range instead. */ 4823 itype = build_range_type (sizetype, size, NULL_TREE); 4824 } 4825 else 4826 { 4827 /* Arrange for the SAVE_EXPR on the inside of the 4828 MINUS_EXPR, which allows the -1 to get folded 4829 with the +1 that happens when building TYPE_SIZE. */ 4830 if (size_varies) 4831 size = variable_size (size); 4832 4833 /* Compute the maximum valid index, that is, size 4834 - 1. Do the calculation in index_type, so that 4835 if it is a variable the computations will be 4836 done in the proper mode. */ 4837 itype = fold_build2 (MINUS_EXPR, index_type, 4838 convert (index_type, size), 4839 convert (index_type, 4840 size_one_node)); 4841 4842 /* If that overflowed, the array is too big. ??? 4843 While a size of INT_MAX+1 technically shouldn't 4844 cause an overflow (because we subtract 1), the 4845 overflow is recorded during the conversion to 4846 index_type, before the subtraction. Handling 4847 this case seems like an unnecessary 4848 complication. */ 4849 if (TREE_CODE (itype) == INTEGER_CST 4850 && TREE_OVERFLOW (itype)) 4851 { 4852 error ("size of array %qs is too large", name); 4853 type = error_mark_node; 4854 continue; 4855 } 4856 4857 itype = build_index_type (itype); 4858 } 4859 } 4860 else if (decl_context == FIELD) 4861 { 4862 if (pedantic && !flag_isoc99 && !in_system_header) 4863 pedwarn ("ISO C90 does not support flexible array members"); 4864 4865 /* ISO C99 Flexible array members are effectively 4866 identical to GCC's zero-length array extension. */ 4867 itype = build_range_type (sizetype, size_zero_node, NULL_TREE); 4868 } 4869 else if (decl_context == PARM) 4870 { 4871 if (array_parm_vla_unspec_p) 4872 { 4873 if (! orig_name) 4874 { 4875 /* C99 6.7.5.2p4 */ 4876 error ("%<[*]%> not allowed in other than a declaration"); 4877 } 4878 4879 itype = build_range_type (sizetype, size_zero_node, NULL_TREE); 4880 size_varies = 1; 4881 } 4882 } 4883 else if (decl_context == TYPENAME) 4884 { 4885 if (array_parm_vla_unspec_p) 4886 { 4887 /* The error is printed elsewhere. We use this to 4888 avoid messing up with incomplete array types of 4889 the same type, that would otherwise be modified 4890 below. */ 4891 itype = build_range_type (sizetype, size_zero_node, 4892 NULL_TREE); 4893 } 4894 } 4895 4896 /* Complain about arrays of incomplete types. */ 4897 if (!COMPLETE_TYPE_P (type)) 4898 { 4899 error ("array type has incomplete element type"); 4900 type = error_mark_node; 4901 } 4902 else 4903 /* When itype is NULL, a shared incomplete array type is 4904 returned for all array of a given type. Elsewhere we 4905 make sure we don't complete that type before copying 4906 it, but here we want to make sure we don't ever 4907 modify the shared type, so we gcc_assert (itype) 4908 below. */ 4909 type = build_array_type (type, itype); 4910 4911 if (type != error_mark_node) 4912 { 4913 if (size_varies) 4914 { 4915 /* It is ok to modify type here even if itype is 4916 NULL: if size_varies, we're in a 4917 multi-dimensional array and the inner type has 4918 variable size, so the enclosing shared array type 4919 must too. */ 4920 if (size && TREE_CODE (size) == INTEGER_CST) 4921 type 4922 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type)); 4923 C_TYPE_VARIABLE_SIZE (type) = 1; 4924 } 4925 4926 /* The GCC extension for zero-length arrays differs from 4927 ISO flexible array members in that sizeof yields 4928 zero. */ 4929 if (size && integer_zerop (size)) 4930 { 4931 gcc_assert (itype); 4932 TYPE_SIZE (type) = bitsize_zero_node; 4933 TYPE_SIZE_UNIT (type) = size_zero_node; 4934 } 4935 if (array_parm_vla_unspec_p) 4936 { 4937 gcc_assert (itype); 4938 /* The type is complete. C99 6.7.5.2p4 */ 4939 TYPE_SIZE (type) = bitsize_zero_node; 4940 TYPE_SIZE_UNIT (type) = size_zero_node; 4941 } 4942 } 4943 4944 if (decl_context != PARM 4945 && (array_ptr_quals != TYPE_UNQUALIFIED 4946 || array_ptr_attrs != NULL_TREE 4947 || array_parm_static)) 4948 { 4949 error ("static or type qualifiers in non-parameter array declarator"); 4950 array_ptr_quals = TYPE_UNQUALIFIED; 4951 array_ptr_attrs = NULL_TREE; 4952 array_parm_static = 0; 4953 } 4954 break; 4955 } 4956 case cdk_function: 4957 { 4958 /* Say it's a definition only for the declarator closest 4959 to the identifier, apart possibly from some 4960 attributes. */ 4961 bool really_funcdef = false; 4962 tree arg_types; 4963 if (funcdef_flag) 4964 { 4965 const struct c_declarator *t = declarator->declarator; 4966 while (t->kind == cdk_attrs) 4967 t = t->declarator; 4968 really_funcdef = (t->kind == cdk_id); 4969 } 4970 4971 /* Declaring a function type. Make sure we have a valid 4972 type for the function to return. */ 4973 if (type == error_mark_node) 4974 continue; 4975 4976 size_varies = 0; 4977 4978 /* Warn about some types functions can't return. */ 4979 if (TREE_CODE (type) == FUNCTION_TYPE) 4980 { 4981 error ("%qs declared as function returning a function", name); 4982 type = integer_type_node; 4983 } 4984 if (TREE_CODE (type) == ARRAY_TYPE) 4985 { 4986 error ("%qs declared as function returning an array", name); 4987 type = integer_type_node; 4988 } 4989 4990 /* Construct the function type and go to the next 4991 inner layer of declarator. */ 4992 arg_info = declarator->u.arg_info; 4993 arg_types = grokparms (arg_info, really_funcdef); 4994 if (really_funcdef) 4995 put_pending_sizes (arg_info->pending_sizes); 4996 4997 /* Type qualifiers before the return type of the function 4998 qualify the return type, not the function type. */ 4999 if (type_quals) 5000 { 5001 /* Type qualifiers on a function return type are 5002 normally permitted by the standard but have no 5003 effect, so give a warning at -Wreturn-type. 5004 Qualifiers on a void return type are banned on 5005 function definitions in ISO C; GCC used to used 5006 them for noreturn functions. */ 5007 if (VOID_TYPE_P (type) && really_funcdef) 5008 pedwarn ("function definition has qualified void return type"); 5009 else 5010 warning (OPT_Wreturn_type, 5011 "type qualifiers ignored on function return type"); 5012 5013 type = c_build_qualified_type (type, type_quals); 5014 } 5015 type_quals = TYPE_UNQUALIFIED; 5016 5017 type = build_function_type (type, arg_types); 5018 declarator = declarator->declarator; 5019 5020 /* Set the TYPE_CONTEXTs for each tagged type which is local to 5021 the formal parameter list of this FUNCTION_TYPE to point to 5022 the FUNCTION_TYPE node itself. */ 5023 { 5024 tree link; 5025 5026 for (link = arg_info->tags; 5027 link; 5028 link = TREE_CHAIN (link)) 5029 TYPE_CONTEXT (TREE_VALUE (link)) = type; 5030 } 5031 break; 5032 } 5033 case cdk_pointer: 5034 { 5035 /* Merge any constancy or volatility into the target type 5036 for the pointer. */ 5037 5038 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE 5039 && type_quals) 5040 pedwarn ("ISO C forbids qualified function types"); 5041 if (type_quals) 5042 type = c_build_qualified_type (type, type_quals); 5043 size_varies = 0; 5044 5045 /* When the pointed-to type involves components of variable size, 5046 care must be taken to ensure that the size evaluation code is 5047 emitted early enough to dominate all the possible later uses 5048 and late enough for the variables on which it depends to have 5049 been assigned. 5050 5051 This is expected to happen automatically when the pointed-to 5052 type has a name/declaration of it's own, but special attention 5053 is required if the type is anonymous. 5054 5055 We handle the NORMAL and FIELD contexts here by attaching an 5056 artificial TYPE_DECL to such pointed-to type. This forces the 5057 sizes evaluation at a safe point and ensures it is not deferred 5058 until e.g. within a deeper conditional context. 5059 5060 We expect nothing to be needed here for PARM or TYPENAME. 5061 Pushing a TYPE_DECL at this point for TYPENAME would actually 5062 be incorrect, as we might be in the middle of an expression 5063 with side effects on the pointed-to type size "arguments" prior 5064 to the pointer declaration point and the fake TYPE_DECL in the 5065 enclosing context would force the size evaluation prior to the 5066 side effects. */ 5067 5068 if (!TYPE_NAME (type) 5069 && (decl_context == NORMAL || decl_context == FIELD) 5070 && variably_modified_type_p (type, NULL_TREE)) 5071 { 5072 tree decl = build_decl (TYPE_DECL, NULL_TREE, type); 5073 DECL_ARTIFICIAL (decl) = 1; 5074 pushdecl (decl); 5075 finish_decl (decl, NULL_TREE, NULL_TREE); 5076 TYPE_NAME (type) = decl; 5077 } 5078 5079 type = build_pointer_type (type); 5080 5081 /* Process type qualifiers (such as const or volatile) 5082 that were given inside the `*'. */ 5083 type_quals = declarator->u.pointer_quals; 5084 5085 declarator = declarator->declarator; 5086 break; 5087 } 5088 5089 5090 /* APPLE LOCAL begin radar 5732232 - blocks (C++ cj) */ 5091 case cdk_block_pointer: 5092 { 5093 if (TREE_CODE (type) != FUNCTION_TYPE) 5094 { 5095 error ("block pointer to non-function type is invalid"); 5096 type = error_mark_node; 5097 } 5098 else 5099 { 5100 type = build_block_pointer_type (type); 5101 /* APPLE LOCAL begin radar 5814025 (C++ cj) */ 5102 /* Process type qualifiers (such as const or volatile) 5103 that were given inside the `^'. */ 5104 type_quals = declarator->u.pointer_quals; 5105 /* APPLE LOCAL end radar 5814025 (C++ cj) */ 5106 declarator = declarator->declarator; 5107 } 5108 break; 5109 } 5110 /* APPLE LOCAL end radar 5732232 - blocks (C++ cj) */ 5111 5112 default: 5113 gcc_unreachable (); 5114 } 5115 } 5116 5117 /* Now TYPE has the actual type, apart from any qualifiers in 5118 TYPE_QUALS. */ 5119 5120 /* Check the type and width of a bit-field. */ 5121 if (bitfield) 5122 check_bitfield_type_and_width (&type, width, orig_name); 5123 5124 /* Did array size calculations overflow? */ 5125 5126 if (TREE_CODE (type) == ARRAY_TYPE 5127 && COMPLETE_TYPE_P (type) 5128 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST 5129 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type))) 5130 { 5131 error ("size of array %qs is too large", name); 5132 /* If we proceed with the array type as it is, we'll eventually 5133 crash in tree_low_cst(). */ 5134 type = error_mark_node; 5135 } 5136 5137 /* APPLE LOCAL begin blocks 6339747 */ 5138 if (decl_context == BLOCKDEF) 5139 { 5140 tree decl; 5141 5142 if (type == error_mark_node) 5143 return error_mark_node; 5144 5145 if (TREE_CODE (type) != FUNCTION_TYPE) 5146 { 5147 tree arg_types; 5148 5149 if (TREE_CODE (type) == ARRAY_TYPE) 5150 { 5151 error ("block declared as returning an array"); 5152 return error_mark_node; 5153 } 5154 5155 arg_info = XOBNEW (&parser_obstack, struct c_arg_info); 5156 arg_info->parms = 0; 5157 arg_info->tags = 0; 5158 arg_info->types = 0; 5159 arg_info->others = 0; 5160 arg_info->pending_sizes = 0; 5161 arg_info->had_vla_unspec = 0; 5162 arg_types = grokparms (arg_info, false); 5163 type_quals = TYPE_UNQUALIFIED; 5164 type = build_function_type (type, arg_types); 5165 } 5166 decl = build_decl (FUNCTION_DECL, NULL_TREE, type); 5167 DECL_ARGUMENTS (decl) = arg_info ? arg_info->parms : NULL_TREE; 5168 return decl; 5169 } 5170 /* APPLE LOCAL end blocks 6339747 */ 5171 5172 /* If this is declaring a typedef name, return a TYPE_DECL. */ 5173 5174 if (storage_class == csc_typedef) 5175 { 5176 tree decl; 5177 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE 5178 && type_quals) 5179 pedwarn ("ISO C forbids qualified function types"); 5180 if (type_quals) 5181 type = c_build_qualified_type (type, type_quals); 5182 decl = build_decl (TYPE_DECL, declarator->u.id, type); 5183 if (declspecs->explicit_signed_p) 5184 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1; 5185 decl_attributes (&decl, returned_attrs, 0); 5186 if (declspecs->inline_p) 5187 pedwarn ("typedef %q+D declared %<inline%>", decl); 5188 return decl; 5189 } 5190 5191 /* If this is a type name (such as, in a cast or sizeof), 5192 compute the type and return it now. */ 5193 5194 if (decl_context == TYPENAME) 5195 { 5196 /* Note that the grammar rejects storage classes in typenames 5197 and fields. */ 5198 gcc_assert (storage_class == csc_none && !threadp 5199 && !declspecs->inline_p); 5200 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE 5201 && type_quals) 5202 pedwarn ("ISO C forbids const or volatile function types"); 5203 if (type_quals) 5204 type = c_build_qualified_type (type, type_quals); 5205 decl_attributes (&type, returned_attrs, 0); 5206 return type; 5207 } 5208 5209 if (pedantic && decl_context == FIELD 5210 && variably_modified_type_p (type, NULL_TREE)) 5211 { 5212 /* C99 6.7.2.1p8 */ 5213 pedwarn ("a member of a structure or union cannot have a variably modified type"); 5214 } 5215 5216 /* Aside from typedefs and type names (handle above), 5217 `void' at top level (not within pointer) 5218 is allowed only in public variables. 5219 We don't complain about parms either, but that is because 5220 a better error message can be made later. */ 5221 5222 if (VOID_TYPE_P (type) && decl_context != PARM 5223 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE) 5224 && (storage_class == csc_extern 5225 || (current_scope == file_scope 5226 && !(storage_class == csc_static 5227 || storage_class == csc_register))))) 5228 { 5229 error ("variable or field %qs declared void", name); 5230 type = integer_type_node; 5231 } 5232 5233 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL 5234 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */ 5235 5236 { 5237 tree decl; 5238 5239 if (decl_context == PARM) 5240 { 5241 tree type_as_written; 5242 tree promoted_type; 5243 5244 /* A parameter declared as an array of T is really a pointer to T. 5245 One declared as a function is really a pointer to a function. */ 5246 5247 if (TREE_CODE (type) == ARRAY_TYPE) 5248 { 5249 /* Transfer const-ness of array into that of type pointed to. */ 5250 type = TREE_TYPE (type); 5251 if (type_quals) 5252 type = c_build_qualified_type (type, type_quals); 5253 type = build_pointer_type (type); 5254 type_quals = array_ptr_quals; 5255 5256 /* We don't yet implement attributes in this context. */ 5257 if (array_ptr_attrs != NULL_TREE) 5258 warning (OPT_Wattributes, 5259 "attributes in parameter array declarator ignored"); 5260 5261 size_varies = 0; 5262 } 5263 else if (TREE_CODE (type) == FUNCTION_TYPE) 5264 { 5265 if (pedantic && type_quals) 5266 pedwarn ("ISO C forbids qualified function types"); 5267 if (type_quals) 5268 type = c_build_qualified_type (type, type_quals); 5269 type = build_pointer_type (type); 5270 type_quals = TYPE_UNQUALIFIED; 5271 } 5272 else if (type_quals) 5273 type = c_build_qualified_type (type, type_quals); 5274 5275 type_as_written = type; 5276 5277 decl = build_decl (PARM_DECL, declarator->u.id, type); 5278 if (size_varies) 5279 C_DECL_VARIABLE_SIZE (decl) = 1; 5280 5281 /* Compute the type actually passed in the parmlist, 5282 for the case where there is no prototype. 5283 (For example, shorts and chars are passed as ints.) 5284 When there is a prototype, this is overridden later. */ 5285 5286 if (type == error_mark_node) 5287 promoted_type = type; 5288 else 5289 promoted_type = c_type_promotes_to (type); 5290 5291 DECL_ARG_TYPE (decl) = promoted_type; 5292 if (declspecs->inline_p) 5293 pedwarn ("parameter %q+D declared %<inline%>", decl); 5294 } 5295 else if (decl_context == FIELD) 5296 { 5297 /* Note that the grammar rejects storage classes in typenames 5298 and fields. */ 5299 gcc_assert (storage_class == csc_none && !threadp 5300 && !declspecs->inline_p); 5301 5302 /* Structure field. It may not be a function. */ 5303 5304 if (TREE_CODE (type) == FUNCTION_TYPE) 5305 { 5306 error ("field %qs declared as a function", name); 5307 type = build_pointer_type (type); 5308 } 5309 else if (TREE_CODE (type) != ERROR_MARK 5310 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type)) 5311 { 5312 error ("field %qs has incomplete type", name); 5313 type = error_mark_node; 5314 } 5315 type = c_build_qualified_type (type, type_quals); 5316 decl = build_decl (FIELD_DECL, declarator->u.id, type); 5317 DECL_NONADDRESSABLE_P (decl) = bitfield; 5318 5319 if (size_varies) 5320 C_DECL_VARIABLE_SIZE (decl) = 1; 5321 } 5322 else if (TREE_CODE (type) == FUNCTION_TYPE) 5323 { 5324 if (storage_class == csc_register || threadp) 5325 { 5326 error ("invalid storage class for function %qs", name); 5327 } 5328 else if (current_scope != file_scope) 5329 { 5330 /* Function declaration not at file scope. Storage 5331 classes other than `extern' are not allowed, C99 5332 6.7.1p5, and `extern' makes no difference. However, 5333 GCC allows 'auto', perhaps with 'inline', to support 5334 nested functions. */ 5335 if (storage_class == csc_auto) 5336 { 5337 if (pedantic) 5338 pedwarn ("invalid storage class for function %qs", name); 5339 } 5340 else if (storage_class == csc_static) 5341 { 5342 error ("invalid storage class for function %qs", name); 5343 if (funcdef_flag) 5344 storage_class = declspecs->storage_class = csc_none; 5345 else 5346 return 0; 5347 } 5348 } 5349 5350 decl = build_decl (FUNCTION_DECL, declarator->u.id, type); 5351 decl = build_decl_attribute_variant (decl, decl_attr); 5352 5353 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl); 5354 5355 if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl)) 5356 pedwarn ("ISO C forbids qualified function types"); 5357 5358 /* GNU C interprets a volatile-qualified function type to indicate 5359 that the function does not return. */ 5360 if ((type_quals & TYPE_QUAL_VOLATILE) 5361 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl)))) 5362 warning (0, "%<noreturn%> function returns non-void value"); 5363 5364 /* Every function declaration is an external reference 5365 (DECL_EXTERNAL) except for those which are not at file 5366 scope and are explicitly declared "auto". This is 5367 forbidden by standard C (C99 6.7.1p5) and is interpreted by 5368 GCC to signify a forward declaration of a nested function. */ 5369 if (storage_class == csc_auto && current_scope != file_scope) 5370 DECL_EXTERNAL (decl) = 0; 5371 /* In C99, a function which is declared 'inline' with 'extern' 5372 is not an external reference (which is confusing). It 5373 means that the later definition of the function must be output 5374 in this file, C99 6.7.4p6. In GNU C89, a function declared 5375 'extern inline' is an external reference. */ 5376 else if (declspecs->inline_p && storage_class != csc_static) 5377 DECL_EXTERNAL (decl) = ((storage_class == csc_extern) 5378 == flag_gnu89_inline); 5379 else 5380 DECL_EXTERNAL (decl) = !initialized; 5381 5382 /* Record absence of global scope for `static' or `auto'. */ 5383 TREE_PUBLIC (decl) 5384 = !(storage_class == csc_static || storage_class == csc_auto); 5385 5386 /* For a function definition, record the argument information 5387 block where store_parm_decls will look for it. */ 5388 if (funcdef_flag) 5389 current_function_arg_info = arg_info; 5390 5391 if (declspecs->default_int_p) 5392 C_FUNCTION_IMPLICIT_INT (decl) = 1; 5393 5394 /* Record presence of `inline', if it is reasonable. */ 5395 if (flag_hosted && MAIN_NAME_P (declarator->u.id)) 5396 { 5397 if (declspecs->inline_p) 5398 pedwarn ("cannot inline function %<main%>"); 5399 } 5400 else if (declspecs->inline_p) 5401 { 5402 /* Record that the function is declared `inline'. */ 5403 DECL_DECLARED_INLINE_P (decl) = 1; 5404 5405 /* Do not mark bare declarations as DECL_INLINE. Doing so 5406 in the presence of multiple declarations can result in 5407 the abstract origin pointing between the declarations, 5408 which will confuse dwarf2out. */ 5409 if (initialized) 5410 DECL_INLINE (decl) = 1; 5411 } 5412 /* If -finline-functions, assume it can be inlined. This does 5413 two things: let the function be deferred until it is actually 5414 needed, and let dwarf2 know that the function is inlinable. */ 5415 else if (flag_inline_trees == 2 && initialized) 5416 DECL_INLINE (decl) = 1; 5417 } 5418 else 5419 { 5420 /* It's a variable. */ 5421 /* An uninitialized decl with `extern' is a reference. */ 5422 int extern_ref = !initialized && storage_class == csc_extern; 5423 5424 type = c_build_qualified_type (type, type_quals); 5425 5426 /* C99 6.2.2p7: It is invalid (compile-time undefined 5427 behavior) to create an 'extern' declaration for a 5428 variable if there is a global declaration that is 5429 'static' and the global declaration is not visible. 5430 (If the static declaration _is_ currently visible, 5431 the 'extern' declaration is taken to refer to that decl.) */ 5432 if (extern_ref && current_scope != file_scope) 5433 { 5434 tree global_decl = identifier_global_value (declarator->u.id); 5435 tree visible_decl = lookup_name (declarator->u.id); 5436 5437 if (global_decl 5438 && global_decl != visible_decl 5439 && TREE_CODE (global_decl) == VAR_DECL 5440 && !TREE_PUBLIC (global_decl)) 5441 error ("variable previously declared %<static%> redeclared " 5442 "%<extern%>"); 5443 } 5444 5445 decl = build_decl (VAR_DECL, declarator->u.id, type); 5446 DECL_SOURCE_LOCATION (decl) = declarator->id_loc; 5447 if (size_varies) 5448 C_DECL_VARIABLE_SIZE (decl) = 1; 5449 5450 if (declspecs->inline_p) 5451 pedwarn ("variable %q+D declared %<inline%>", decl); 5452 5453 /* At file scope, an initialized extern declaration may follow 5454 a static declaration. In that case, DECL_EXTERNAL will be 5455 reset later in start_decl. */ 5456 DECL_EXTERNAL (decl) = (storage_class == csc_extern); 5457 5458 /* At file scope, the presence of a `static' or `register' storage 5459 class specifier, or the absence of all storage class specifiers 5460 makes this declaration a definition (perhaps tentative). Also, 5461 the absence of `static' makes it public. */ 5462 if (current_scope == file_scope) 5463 { 5464 TREE_PUBLIC (decl) = storage_class != csc_static; 5465 TREE_STATIC (decl) = !extern_ref; 5466 } 5467 /* Not at file scope, only `static' makes a static definition. */ 5468 else 5469 { 5470 TREE_STATIC (decl) = (storage_class == csc_static); 5471 TREE_PUBLIC (decl) = extern_ref; 5472 } 5473 5474 if (threadp) 5475 { 5476 if (targetm.have_tls) 5477 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl); 5478 else 5479 /* A mere warning is sure to result in improper semantics 5480 at runtime. Don't bother to allow this to compile. */ 5481 error ("thread-local storage not supported for this target"); 5482 } 5483 } 5484 5485 if (storage_class == csc_extern 5486 && variably_modified_type_p (type, NULL_TREE)) 5487 { 5488 /* C99 6.7.5.2p2 */ 5489 error ("object with variably modified type must have no linkage"); 5490 } 5491 5492 /* Record `register' declaration for warnings on & 5493 and in case doing stupid register allocation. */ 5494 5495 if (storage_class == csc_register) 5496 { 5497 C_DECL_REGISTER (decl) = 1; 5498 DECL_REGISTER (decl) = 1; 5499 } 5500 5501 /* Record constancy and volatility. */ 5502 c_apply_type_quals_to_decl (type_quals, decl); 5503 5504 /* If a type has volatile components, it should be stored in memory. 5505 Otherwise, the fact that those components are volatile 5506 will be ignored, and would even crash the compiler. 5507 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */ 5508 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)) 5509 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL 5510 || TREE_CODE (decl) == RESULT_DECL)) 5511 { 5512 /* It is not an error for a structure with volatile fields to 5513 be declared register, but reset DECL_REGISTER since it 5514 cannot actually go in a register. */ 5515 int was_reg = C_DECL_REGISTER (decl); 5516 C_DECL_REGISTER (decl) = 0; 5517 DECL_REGISTER (decl) = 0; 5518 c_mark_addressable (decl); 5519 C_DECL_REGISTER (decl) = was_reg; 5520 } 5521 5522 /* This is the earliest point at which we might know the assembler 5523 name of a variable. Thus, if it's known before this, die horribly. */ 5524 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl)); 5525 5526 decl_attributes (&decl, returned_attrs, 0); 5527 5528 return decl; 5529 } 5530} 5531 5532/* Decode the parameter-list info for a function type or function definition. 5533 The argument is the value returned by `get_parm_info' (or made in c-parse.c 5534 if there is an identifier list instead of a parameter decl list). 5535 These two functions are separate because when a function returns 5536 or receives functions then each is called multiple times but the order 5537 of calls is different. The last call to `grokparms' is always the one 5538 that contains the formal parameter names of a function definition. 5539 5540 Return a list of arg types to use in the FUNCTION_TYPE for this function. 5541 5542 FUNCDEF_FLAG is true for a function definition, false for 5543 a mere declaration. A nonempty identifier-list gets an error message 5544 when FUNCDEF_FLAG is false. */ 5545 5546static tree 5547grokparms (struct c_arg_info *arg_info, bool funcdef_flag) 5548{ 5549 tree arg_types = arg_info->types; 5550 5551 if (funcdef_flag && arg_info->had_vla_unspec) 5552 { 5553 /* A function definition isn't function prototype scope C99 6.2.1p4. */ 5554 /* C99 6.7.5.2p4 */ 5555 error ("%<[*]%> not allowed in other than function prototype scope"); 5556 } 5557 5558 if (arg_types == 0 && !funcdef_flag && !in_system_header) 5559 warning (OPT_Wstrict_prototypes, 5560 "function declaration isn%'t a prototype"); 5561 5562 if (arg_types == error_mark_node) 5563 return 0; /* don't set TYPE_ARG_TYPES in this case */ 5564 5565 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE) 5566 { 5567 if (!funcdef_flag) 5568 pedwarn ("parameter names (without types) in function declaration"); 5569 5570 arg_info->parms = arg_info->types; 5571 arg_info->types = 0; 5572 return 0; 5573 } 5574 else 5575 { 5576 tree parm, type, typelt; 5577 unsigned int parmno; 5578 5579 /* If there is a parameter of incomplete type in a definition, 5580 this is an error. In a declaration this is valid, and a 5581 struct or union type may be completed later, before any calls 5582 or definition of the function. In the case where the tag was 5583 first declared within the parameter list, a warning has 5584 already been given. If a parameter has void type, then 5585 however the function cannot be defined or called, so 5586 warn. */ 5587 5588 for (parm = arg_info->parms, typelt = arg_types, parmno = 1; 5589 parm; 5590 parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++) 5591 { 5592 type = TREE_VALUE (typelt); 5593 if (type == error_mark_node) 5594 continue; 5595 5596 if (!COMPLETE_TYPE_P (type)) 5597 { 5598 if (funcdef_flag) 5599 { 5600 if (DECL_NAME (parm)) 5601 error ("parameter %u (%q+D) has incomplete type", 5602 parmno, parm); 5603 else 5604 error ("%Jparameter %u has incomplete type", 5605 parm, parmno); 5606 5607 TREE_VALUE (typelt) = error_mark_node; 5608 TREE_TYPE (parm) = error_mark_node; 5609 } 5610 else if (VOID_TYPE_P (type)) 5611 { 5612 if (DECL_NAME (parm)) 5613 warning (0, "parameter %u (%q+D) has void type", 5614 parmno, parm); 5615 else 5616 warning (0, "%Jparameter %u has void type", 5617 parm, parmno); 5618 } 5619 } 5620 5621 if (DECL_NAME (parm) && TREE_USED (parm)) 5622 warn_if_shadowing (parm); 5623 } 5624 return arg_types; 5625 } 5626} 5627 5628/* Take apart the current scope and return a c_arg_info structure with 5629 info on a parameter list just parsed. 5630 5631 This structure is later fed to 'grokparms' and 'store_parm_decls'. 5632 5633 ELLIPSIS being true means the argument list ended in '...' so don't 5634 append a sentinel (void_list_node) to the end of the type-list. */ 5635 5636struct c_arg_info * 5637get_parm_info (bool ellipsis) 5638{ 5639 struct c_binding *b = current_scope->bindings; 5640 struct c_arg_info *arg_info = XOBNEW (&parser_obstack, 5641 struct c_arg_info); 5642 tree parms = 0; 5643 tree tags = 0; 5644 tree types = 0; 5645 tree others = 0; 5646 5647 static bool explained_incomplete_types = false; 5648 bool gave_void_only_once_err = false; 5649 5650 arg_info->parms = 0; 5651 arg_info->tags = 0; 5652 arg_info->types = 0; 5653 arg_info->others = 0; 5654 arg_info->pending_sizes = 0; 5655 arg_info->had_vla_unspec = current_scope->had_vla_unspec; 5656 5657 /* The bindings in this scope must not get put into a block. 5658 We will take care of deleting the binding nodes. */ 5659 current_scope->bindings = 0; 5660 5661 /* This function is only called if there was *something* on the 5662 parameter list. */ 5663 gcc_assert (b); 5664 5665 /* A parameter list consisting solely of 'void' indicates that the 5666 function takes no arguments. But if the 'void' is qualified 5667 (by 'const' or 'volatile'), or has a storage class specifier 5668 ('register'), then the behavior is undefined; issue an error. 5669 Typedefs for 'void' are OK (see DR#157). */ 5670 if (b->prev == 0 /* one binding */ 5671 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */ 5672 && !DECL_NAME (b->decl) /* anonymous */ 5673 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */ 5674 { 5675 if (TREE_THIS_VOLATILE (b->decl) 5676 || TREE_READONLY (b->decl) 5677 || C_DECL_REGISTER (b->decl)) 5678 error ("%<void%> as only parameter may not be qualified"); 5679 5680 /* There cannot be an ellipsis. */ 5681 if (ellipsis) 5682 error ("%<void%> must be the only parameter"); 5683 5684 arg_info->types = void_list_node; 5685 return arg_info; 5686 } 5687 5688 if (!ellipsis) 5689 types = void_list_node; 5690 5691 /* Break up the bindings list into parms, tags, types, and others; 5692 apply sanity checks; purge the name-to-decl bindings. */ 5693 while (b) 5694 { 5695 tree decl = b->decl; 5696 tree type = TREE_TYPE (decl); 5697 const char *keyword; 5698 5699 switch (TREE_CODE (decl)) 5700 { 5701 case PARM_DECL: 5702 if (b->id) 5703 { 5704 gcc_assert (I_SYMBOL_BINDING (b->id) == b); 5705 I_SYMBOL_BINDING (b->id) = b->shadowed; 5706 } 5707 5708 /* Check for forward decls that never got their actual decl. */ 5709 if (TREE_ASM_WRITTEN (decl)) 5710 error ("parameter %q+D has just a forward declaration", decl); 5711 /* Check for (..., void, ...) and issue an error. */ 5712 else if (VOID_TYPE_P (type) && !DECL_NAME (decl)) 5713 { 5714 if (!gave_void_only_once_err) 5715 { 5716 error ("%<void%> must be the only parameter"); 5717 gave_void_only_once_err = true; 5718 } 5719 } 5720 else 5721 { 5722 /* Valid parameter, add it to the list. */ 5723 TREE_CHAIN (decl) = parms; 5724 parms = decl; 5725 5726 /* Since there is a prototype, args are passed in their 5727 declared types. The back end may override this later. */ 5728 DECL_ARG_TYPE (decl) = type; 5729 types = tree_cons (0, type, types); 5730 } 5731 break; 5732 5733 case ENUMERAL_TYPE: keyword = "enum"; goto tag; 5734 case UNION_TYPE: keyword = "union"; goto tag; 5735 case RECORD_TYPE: keyword = "struct"; goto tag; 5736 tag: 5737 /* Types may not have tag-names, in which case the type 5738 appears in the bindings list with b->id NULL. */ 5739 if (b->id) 5740 { 5741 gcc_assert (I_TAG_BINDING (b->id) == b); 5742 I_TAG_BINDING (b->id) = b->shadowed; 5743 } 5744 5745 /* Warn about any struct, union or enum tags defined in a 5746 parameter list. The scope of such types is limited to 5747 the parameter list, which is rarely if ever desirable 5748 (it's impossible to call such a function with type- 5749 correct arguments). An anonymous union parm type is 5750 meaningful as a GNU extension, so don't warn for that. */ 5751 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0) 5752 { 5753 if (b->id) 5754 /* The %s will be one of 'struct', 'union', or 'enum'. */ 5755 warning (0, "%<%s %E%> declared inside parameter list", 5756 keyword, b->id); 5757 else 5758 /* The %s will be one of 'struct', 'union', or 'enum'. */ 5759 warning (0, "anonymous %s declared inside parameter list", 5760 keyword); 5761 5762 if (!explained_incomplete_types) 5763 { 5764 warning (0, "its scope is only this definition or declaration," 5765 " which is probably not what you want"); 5766 explained_incomplete_types = true; 5767 } 5768 } 5769 5770 tags = tree_cons (b->id, decl, tags); 5771 break; 5772 5773 case CONST_DECL: 5774 case TYPE_DECL: 5775 case FUNCTION_DECL: 5776 /* CONST_DECLs appear here when we have an embedded enum, 5777 and TYPE_DECLs appear here when we have an embedded struct 5778 or union. No warnings for this - we already warned about the 5779 type itself. FUNCTION_DECLs appear when there is an implicit 5780 function declaration in the parameter list. */ 5781 5782 TREE_CHAIN (decl) = others; 5783 others = decl; 5784 /* fall through */ 5785 5786 case ERROR_MARK: 5787 /* error_mark_node appears here when we have an undeclared 5788 variable. Just throw it away. */ 5789 if (b->id) 5790 { 5791 gcc_assert (I_SYMBOL_BINDING (b->id) == b); 5792 I_SYMBOL_BINDING (b->id) = b->shadowed; 5793 } 5794 break; 5795 5796 /* Other things that might be encountered. */ 5797 case LABEL_DECL: 5798 case VAR_DECL: 5799 default: 5800 gcc_unreachable (); 5801 } 5802 5803 b = free_binding_and_advance (b); 5804 } 5805 5806 arg_info->parms = parms; 5807 arg_info->tags = tags; 5808 arg_info->types = types; 5809 arg_info->others = others; 5810 arg_info->pending_sizes = get_pending_sizes (); 5811 return arg_info; 5812} 5813 5814/* Get the struct, enum or union (CODE says which) with tag NAME. 5815 Define the tag as a forward-reference if it is not defined. 5816 Return a c_typespec structure for the type specifier. */ 5817 5818struct c_typespec 5819parser_xref_tag (enum tree_code code, tree name) 5820{ 5821 struct c_typespec ret; 5822 /* If a cross reference is requested, look up the type 5823 already defined for this tag and return it. */ 5824 5825 tree ref = lookup_tag (code, name, 0); 5826 /* If this is the right type of tag, return what we found. 5827 (This reference will be shadowed by shadow_tag later if appropriate.) 5828 If this is the wrong type of tag, do not return it. If it was the 5829 wrong type in the same scope, we will have had an error 5830 message already; if in a different scope and declaring 5831 a name, pending_xref_error will give an error message; but if in a 5832 different scope and not declaring a name, this tag should 5833 shadow the previous declaration of a different type of tag, and 5834 this would not work properly if we return the reference found. 5835 (For example, with "struct foo" in an outer scope, "union foo;" 5836 must shadow that tag with a new one of union type.) */ 5837 ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref); 5838 if (ref && TREE_CODE (ref) == code) 5839 { 5840 ret.spec = ref; 5841 return ret; 5842 } 5843 5844 /* If no such tag is yet defined, create a forward-reference node 5845 and record it as the "definition". 5846 When a real declaration of this type is found, 5847 the forward-reference will be altered into a real type. */ 5848 5849 ref = make_node (code); 5850 if (code == ENUMERAL_TYPE) 5851 { 5852 /* Give the type a default layout like unsigned int 5853 to avoid crashing if it does not get defined. */ 5854 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node); 5855 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node); 5856 TYPE_USER_ALIGN (ref) = 0; 5857 TYPE_UNSIGNED (ref) = 1; 5858 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node); 5859 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node); 5860 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node); 5861 } 5862 5863 pushtag (name, ref); 5864 5865 ret.spec = ref; 5866 return ret; 5867} 5868 5869/* Get the struct, enum or union (CODE says which) with tag NAME. 5870 Define the tag as a forward-reference if it is not defined. 5871 Return a tree for the type. */ 5872 5873tree 5874xref_tag (enum tree_code code, tree name) 5875{ 5876 return parser_xref_tag (code, name).spec; 5877} 5878 5879/* Make sure that the tag NAME is defined *in the current scope* 5880 at least as a forward reference. 5881 CODE says which kind of tag NAME ought to be. */ 5882 5883tree 5884start_struct (enum tree_code code, tree name) 5885{ 5886 /* If there is already a tag defined at this scope 5887 (as a forward reference), just return it. */ 5888 5889 tree ref = 0; 5890 5891 if (name != 0) 5892 ref = lookup_tag (code, name, 1); 5893 if (ref && TREE_CODE (ref) == code) 5894 { 5895 if (TYPE_SIZE (ref)) 5896 { 5897 if (code == UNION_TYPE) 5898 error ("redefinition of %<union %E%>", name); 5899 else 5900 error ("redefinition of %<struct %E%>", name); 5901 } 5902 else if (C_TYPE_BEING_DEFINED (ref)) 5903 { 5904 if (code == UNION_TYPE) 5905 error ("nested redefinition of %<union %E%>", name); 5906 else 5907 error ("nested redefinition of %<struct %E%>", name); 5908 /* Don't create structures that contain themselves. */ 5909 ref = NULL_TREE; 5910 } 5911 } 5912 5913 /* Otherwise create a forward-reference just so the tag is in scope. */ 5914 5915 if (ref == NULL_TREE || TREE_CODE (ref) != code) 5916 { 5917 ref = make_node (code); 5918 pushtag (name, ref); 5919 } 5920 5921 C_TYPE_BEING_DEFINED (ref) = 1; 5922 TYPE_PACKED (ref) = flag_pack_struct; 5923 return ref; 5924} 5925 5926/* Process the specs, declarator and width (NULL if omitted) 5927 of a structure component, returning a FIELD_DECL node. 5928 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node. 5929 5930 This is done during the parsing of the struct declaration. 5931 The FIELD_DECL nodes are chained together and the lot of them 5932 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */ 5933 5934tree 5935grokfield (struct c_declarator *declarator, struct c_declspecs *declspecs, 5936 tree width) 5937{ 5938 tree value; 5939 5940 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE 5941 && width == NULL_TREE) 5942 { 5943 /* This is an unnamed decl. 5944 5945 If we have something of the form "union { list } ;" then this 5946 is the anonymous union extension. Similarly for struct. 5947 5948 If this is something of the form "struct foo;", then 5949 If MS extensions are enabled, this is handled as an 5950 anonymous struct. 5951 Otherwise this is a forward declaration of a structure tag. 5952 5953 If this is something of the form "foo;" and foo is a TYPE_DECL, then 5954 If MS extensions are enabled and foo names a structure, then 5955 again this is an anonymous struct. 5956 Otherwise this is an error. 5957 5958 Oh what a horrid tangled web we weave. I wonder if MS consciously 5959 took this from Plan 9 or if it was an accident of implementation 5960 that took root before someone noticed the bug... */ 5961 5962 tree type = declspecs->type; 5963 bool type_ok = (TREE_CODE (type) == RECORD_TYPE 5964 || TREE_CODE (type) == UNION_TYPE); 5965 bool ok = false; 5966 5967 if (type_ok 5968 && (flag_ms_extensions || !declspecs->typedef_p)) 5969 { 5970 if (flag_ms_extensions) 5971 ok = true; 5972 else if (flag_iso) 5973 ok = false; 5974 else if (TYPE_NAME (type) == NULL) 5975 ok = true; 5976 else 5977 ok = false; 5978 } 5979 if (!ok) 5980 { 5981 pedwarn ("declaration does not declare anything"); 5982 return NULL_TREE; 5983 } 5984 if (pedantic) 5985 pedwarn ("ISO C doesn%'t support unnamed structs/unions"); 5986 } 5987 5988 value = grokdeclarator (declarator, declspecs, FIELD, false, 5989 width ? &width : NULL); 5990 5991 finish_decl (value, NULL_TREE, NULL_TREE); 5992 DECL_INITIAL (value) = width; 5993 5994 return value; 5995} 5996 5997/* Generate an error for any duplicate field names in FIELDLIST. Munge 5998 the list such that this does not present a problem later. */ 5999 6000static void 6001detect_field_duplicates (tree fieldlist) 6002{ 6003 tree x, y; 6004 int timeout = 10; 6005 6006 /* First, see if there are more than "a few" fields. 6007 This is trivially true if there are zero or one fields. */ 6008 if (!fieldlist) 6009 return; 6010 x = TREE_CHAIN (fieldlist); 6011 if (!x) 6012 return; 6013 do { 6014 timeout--; 6015 x = TREE_CHAIN (x); 6016 } while (timeout > 0 && x); 6017 6018 /* If there were "few" fields, avoid the overhead of allocating 6019 a hash table. Instead just do the nested traversal thing. */ 6020 if (timeout > 0) 6021 { 6022 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x)) 6023 if (DECL_NAME (x)) 6024 { 6025 for (y = fieldlist; y != x; y = TREE_CHAIN (y)) 6026 if (DECL_NAME (y) == DECL_NAME (x)) 6027 { 6028 error ("duplicate member %q+D", x); 6029 DECL_NAME (x) = NULL_TREE; 6030 } 6031 } 6032 } 6033 else 6034 { 6035 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL); 6036 void **slot; 6037 6038 for (x = fieldlist; x ; x = TREE_CHAIN (x)) 6039 if ((y = DECL_NAME (x)) != 0) 6040 { 6041 slot = htab_find_slot (htab, y, INSERT); 6042 if (*slot) 6043 { 6044 error ("duplicate member %q+D", x); 6045 DECL_NAME (x) = NULL_TREE; 6046 } 6047 *slot = y; 6048 } 6049 6050 htab_delete (htab); 6051 } 6052} 6053 6054/* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T. 6055 FIELDLIST is a chain of FIELD_DECL nodes for the fields. 6056 ATTRIBUTES are attributes to be applied to the structure. */ 6057 6058tree 6059finish_struct (tree t, tree fieldlist, tree attributes) 6060{ 6061 tree x; 6062 bool toplevel = file_scope == current_scope; 6063 int saw_named_field; 6064 6065 /* If this type was previously laid out as a forward reference, 6066 make sure we lay it out again. */ 6067 6068 TYPE_SIZE (t) = 0; 6069 6070 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE); 6071 6072 if (pedantic) 6073 { 6074 for (x = fieldlist; x; x = TREE_CHAIN (x)) 6075 if (DECL_NAME (x) != 0) 6076 break; 6077 6078 if (x == 0) 6079 { 6080 if (TREE_CODE (t) == UNION_TYPE) 6081 { 6082 if (fieldlist) 6083 pedwarn ("union has no named members"); 6084 else 6085 pedwarn ("union has no members"); 6086 } 6087 else 6088 { 6089 if (fieldlist) 6090 pedwarn ("struct has no named members"); 6091 else 6092 pedwarn ("struct has no members"); 6093 } 6094 } 6095 } 6096 6097 /* Install struct as DECL_CONTEXT of each field decl. 6098 Also process specified field sizes, found in the DECL_INITIAL, 6099 storing 0 there after the type has been changed to precision equal 6100 to its width, rather than the precision of the specified standard 6101 type. (Correct layout requires the original type to have been preserved 6102 until now.) */ 6103 6104 saw_named_field = 0; 6105 for (x = fieldlist; x; x = TREE_CHAIN (x)) 6106 { 6107 if (TREE_TYPE (x) == error_mark_node) 6108 continue; 6109 6110 DECL_CONTEXT (x) = t; 6111 6112 if (TYPE_PACKED (t) && TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT) 6113 DECL_PACKED (x) = 1; 6114 6115 /* If any field is const, the structure type is pseudo-const. */ 6116 if (TREE_READONLY (x)) 6117 C_TYPE_FIELDS_READONLY (t) = 1; 6118 else 6119 { 6120 /* A field that is pseudo-const makes the structure likewise. */ 6121 tree t1 = TREE_TYPE (x); 6122 while (TREE_CODE (t1) == ARRAY_TYPE) 6123 t1 = TREE_TYPE (t1); 6124 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE) 6125 && C_TYPE_FIELDS_READONLY (t1)) 6126 C_TYPE_FIELDS_READONLY (t) = 1; 6127 } 6128 6129 /* Any field that is volatile means variables of this type must be 6130 treated in some ways as volatile. */ 6131 if (TREE_THIS_VOLATILE (x)) 6132 C_TYPE_FIELDS_VOLATILE (t) = 1; 6133 6134 /* Any field of nominal variable size implies structure is too. */ 6135 if (C_DECL_VARIABLE_SIZE (x)) 6136 C_TYPE_VARIABLE_SIZE (t) = 1; 6137 6138 if (DECL_INITIAL (x)) 6139 { 6140 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1); 6141 DECL_SIZE (x) = bitsize_int (width); 6142 DECL_BIT_FIELD (x) = 1; 6143 SET_DECL_C_BIT_FIELD (x); 6144 } 6145 6146 /* Detect flexible array member in an invalid context. */ 6147 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE 6148 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE 6149 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE 6150 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE) 6151 { 6152 if (TREE_CODE (t) == UNION_TYPE) 6153 { 6154 error ("%Jflexible array member in union", x); 6155 TREE_TYPE (x) = error_mark_node; 6156 } 6157 else if (TREE_CHAIN (x) != NULL_TREE) 6158 { 6159 error ("%Jflexible array member not at end of struct", x); 6160 TREE_TYPE (x) = error_mark_node; 6161 } 6162 else if (!saw_named_field) 6163 { 6164 error ("%Jflexible array member in otherwise empty struct", x); 6165 TREE_TYPE (x) = error_mark_node; 6166 } 6167 } 6168 6169 if (pedantic && !in_system_header && TREE_CODE (t) == RECORD_TYPE 6170 && flexible_array_type_p (TREE_TYPE (x))) 6171 pedwarn ("%Jinvalid use of structure with flexible array member", x); 6172 6173 if (DECL_NAME (x)) 6174 saw_named_field = 1; 6175 } 6176 6177 detect_field_duplicates (fieldlist); 6178 6179 /* Now we have the nearly final fieldlist. Record it, 6180 then lay out the structure or union (including the fields). */ 6181 6182 TYPE_FIELDS (t) = fieldlist; 6183 6184 layout_type (t); 6185 6186 /* Give bit-fields their proper types. */ 6187 { 6188 tree *fieldlistp = &fieldlist; 6189 while (*fieldlistp) 6190 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp) 6191 && TREE_TYPE (*fieldlistp) != error_mark_node) 6192 { 6193 unsigned HOST_WIDE_INT width 6194 = tree_low_cst (DECL_INITIAL (*fieldlistp), 1); 6195 tree type = TREE_TYPE (*fieldlistp); 6196 if (width != TYPE_PRECISION (type)) 6197 { 6198 TREE_TYPE (*fieldlistp) 6199 = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type)); 6200 DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp)); 6201 } 6202 DECL_INITIAL (*fieldlistp) = 0; 6203 } 6204 else 6205 fieldlistp = &TREE_CHAIN (*fieldlistp); 6206 } 6207 6208 /* Now we have the truly final field list. 6209 Store it in this type and in the variants. */ 6210 6211 TYPE_FIELDS (t) = fieldlist; 6212 6213 /* If there are lots of fields, sort so we can look through them fast. 6214 We arbitrarily consider 16 or more elts to be "a lot". */ 6215 6216 { 6217 int len = 0; 6218 6219 for (x = fieldlist; x; x = TREE_CHAIN (x)) 6220 { 6221 if (len > 15 || DECL_NAME (x) == NULL) 6222 break; 6223 len += 1; 6224 } 6225 6226 if (len > 15) 6227 { 6228 tree *field_array; 6229 struct lang_type *space; 6230 struct sorted_fields_type *space2; 6231 6232 len += list_length (x); 6233 6234 /* Use the same allocation policy here that make_node uses, to 6235 ensure that this lives as long as the rest of the struct decl. 6236 All decls in an inline function need to be saved. */ 6237 6238 space = GGC_CNEW (struct lang_type); 6239 space2 = GGC_NEWVAR (struct sorted_fields_type, 6240 sizeof (struct sorted_fields_type) + len * sizeof (tree)); 6241 6242 len = 0; 6243 space->s = space2; 6244 field_array = &space2->elts[0]; 6245 for (x = fieldlist; x; x = TREE_CHAIN (x)) 6246 { 6247 field_array[len++] = x; 6248 6249 /* If there is anonymous struct or union, break out of the loop. */ 6250 if (DECL_NAME (x) == NULL) 6251 break; 6252 } 6253 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */ 6254 if (x == NULL) 6255 { 6256 TYPE_LANG_SPECIFIC (t) = space; 6257 TYPE_LANG_SPECIFIC (t)->s->len = len; 6258 field_array = TYPE_LANG_SPECIFIC (t)->s->elts; 6259 qsort (field_array, len, sizeof (tree), field_decl_cmp); 6260 } 6261 } 6262 } 6263 6264 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x)) 6265 { 6266 TYPE_FIELDS (x) = TYPE_FIELDS (t); 6267 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t); 6268 C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t); 6269 C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t); 6270 C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t); 6271 } 6272 6273 /* If this was supposed to be a transparent union, but we can't 6274 make it one, warn and turn off the flag. */ 6275 if (TREE_CODE (t) == UNION_TYPE 6276 && TYPE_TRANSPARENT_UNION (t) 6277 && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))) 6278 { 6279 TYPE_TRANSPARENT_UNION (t) = 0; 6280 warning (0, "union cannot be made transparent"); 6281 } 6282 6283 /* If this structure or union completes the type of any previous 6284 variable declaration, lay it out and output its rtl. */ 6285 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)); 6286 x; 6287 x = TREE_CHAIN (x)) 6288 { 6289 tree decl = TREE_VALUE (x); 6290 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE) 6291 layout_array_type (TREE_TYPE (decl)); 6292 if (TREE_CODE (decl) != TYPE_DECL) 6293 { 6294 layout_decl (decl, 0); 6295 if (c_dialect_objc ()) 6296 objc_check_decl (decl); 6297 rest_of_decl_compilation (decl, toplevel, 0); 6298 if (!toplevel) 6299 expand_decl (decl); 6300 } 6301 } 6302 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0; 6303 6304 /* Finish debugging output for this type. */ 6305 rest_of_type_compilation (t, toplevel); 6306 6307 /* If we're inside a function proper, i.e. not file-scope and not still 6308 parsing parameters, then arrange for the size of a variable sized type 6309 to be bound now. */ 6310 if (cur_stmt_list && variably_modified_type_p (t, NULL_TREE)) 6311 add_stmt (build_stmt (DECL_EXPR, build_decl (TYPE_DECL, NULL, t))); 6312 6313 return t; 6314} 6315 6316/* Lay out the type T, and its element type, and so on. */ 6317 6318static void 6319layout_array_type (tree t) 6320{ 6321 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE) 6322 layout_array_type (TREE_TYPE (t)); 6323 layout_type (t); 6324} 6325 6326/* Begin compiling the definition of an enumeration type. 6327 NAME is its name (or null if anonymous). 6328 Returns the type object, as yet incomplete. 6329 Also records info about it so that build_enumerator 6330 may be used to declare the individual values as they are read. */ 6331 6332tree 6333start_enum (tree name) 6334{ 6335 tree enumtype = 0; 6336 6337 /* If this is the real definition for a previous forward reference, 6338 fill in the contents in the same object that used to be the 6339 forward reference. */ 6340 6341 if (name != 0) 6342 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1); 6343 6344 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE) 6345 { 6346 enumtype = make_node (ENUMERAL_TYPE); 6347 pushtag (name, enumtype); 6348 } 6349 6350 if (C_TYPE_BEING_DEFINED (enumtype)) 6351 error ("nested redefinition of %<enum %E%>", name); 6352 6353 C_TYPE_BEING_DEFINED (enumtype) = 1; 6354 6355 if (TYPE_VALUES (enumtype) != 0) 6356 { 6357 /* This enum is a named one that has been declared already. */ 6358 error ("redeclaration of %<enum %E%>", name); 6359 6360 /* Completely replace its old definition. 6361 The old enumerators remain defined, however. */ 6362 TYPE_VALUES (enumtype) = 0; 6363 } 6364 6365 enum_next_value = integer_zero_node; 6366 enum_overflow = 0; 6367 6368 if (flag_short_enums) 6369 TYPE_PACKED (enumtype) = 1; 6370 6371 return enumtype; 6372} 6373 6374/* After processing and defining all the values of an enumeration type, 6375 install their decls in the enumeration type and finish it off. 6376 ENUMTYPE is the type object, VALUES a list of decl-value pairs, 6377 and ATTRIBUTES are the specified attributes. 6378 Returns ENUMTYPE. */ 6379 6380tree 6381finish_enum (tree enumtype, tree values, tree attributes) 6382{ 6383 tree pair, tem; 6384 tree minnode = 0, maxnode = 0; 6385 int precision, unsign; 6386 bool toplevel = (file_scope == current_scope); 6387 struct lang_type *lt; 6388 6389 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE); 6390 6391 /* Calculate the maximum value of any enumerator in this type. */ 6392 6393 if (values == error_mark_node) 6394 minnode = maxnode = integer_zero_node; 6395 else 6396 { 6397 minnode = maxnode = TREE_VALUE (values); 6398 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair)) 6399 { 6400 tree value = TREE_VALUE (pair); 6401 if (tree_int_cst_lt (maxnode, value)) 6402 maxnode = value; 6403 if (tree_int_cst_lt (value, minnode)) 6404 minnode = value; 6405 } 6406 } 6407 6408 /* Construct the final type of this enumeration. It is the same 6409 as one of the integral types - the narrowest one that fits, except 6410 that normally we only go as narrow as int - and signed iff any of 6411 the values are negative. */ 6412 unsign = (tree_int_cst_sgn (minnode) >= 0); 6413 precision = MAX (min_precision (minnode, unsign), 6414 min_precision (maxnode, unsign)); 6415 6416 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node)) 6417 { 6418 tem = c_common_type_for_size (precision, unsign); 6419 if (tem == NULL) 6420 { 6421 warning (0, "enumeration values exceed range of largest integer"); 6422 tem = long_long_integer_type_node; 6423 } 6424 } 6425 else 6426 tem = unsign ? unsigned_type_node : integer_type_node; 6427 6428 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem); 6429 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem); 6430 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem); 6431 TYPE_SIZE (enumtype) = 0; 6432 6433 /* If the precision of the type was specific with an attribute and it 6434 was too small, give an error. Otherwise, use it. */ 6435 if (TYPE_PRECISION (enumtype)) 6436 { 6437 if (precision > TYPE_PRECISION (enumtype)) 6438 error ("specified mode too small for enumeral values"); 6439 } 6440 else 6441 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem); 6442 6443 layout_type (enumtype); 6444 6445 if (values != error_mark_node) 6446 { 6447 /* Change the type of the enumerators to be the enum type. We 6448 need to do this irrespective of the size of the enum, for 6449 proper type checking. Replace the DECL_INITIALs of the 6450 enumerators, and the value slots of the list, with copies 6451 that have the enum type; they cannot be modified in place 6452 because they may be shared (e.g. integer_zero_node) Finally, 6453 change the purpose slots to point to the names of the decls. */ 6454 for (pair = values; pair; pair = TREE_CHAIN (pair)) 6455 { 6456 tree enu = TREE_PURPOSE (pair); 6457 tree ini = DECL_INITIAL (enu); 6458 6459 TREE_TYPE (enu) = enumtype; 6460 6461 /* The ISO C Standard mandates enumerators to have type int, 6462 even though the underlying type of an enum type is 6463 unspecified. Here we convert any enumerators that fit in 6464 an int to type int, to avoid promotions to unsigned types 6465 when comparing integers with enumerators that fit in the 6466 int range. When -pedantic is given, build_enumerator() 6467 would have already taken care of those that don't fit. */ 6468 if (int_fits_type_p (ini, integer_type_node)) 6469 tem = integer_type_node; 6470 else 6471 tem = enumtype; 6472 ini = convert (tem, ini); 6473 6474 DECL_INITIAL (enu) = ini; 6475 TREE_PURPOSE (pair) = DECL_NAME (enu); 6476 TREE_VALUE (pair) = ini; 6477 } 6478 6479 TYPE_VALUES (enumtype) = values; 6480 } 6481 6482 /* Record the min/max values so that we can warn about bit-field 6483 enumerations that are too small for the values. */ 6484 lt = GGC_CNEW (struct lang_type); 6485 lt->enum_min = minnode; 6486 lt->enum_max = maxnode; 6487 TYPE_LANG_SPECIFIC (enumtype) = lt; 6488 6489 /* Fix up all variant types of this enum type. */ 6490 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem)) 6491 { 6492 if (tem == enumtype) 6493 continue; 6494 TYPE_VALUES (tem) = TYPE_VALUES (enumtype); 6495 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype); 6496 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype); 6497 TYPE_SIZE (tem) = TYPE_SIZE (enumtype); 6498 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype); 6499 TYPE_MODE (tem) = TYPE_MODE (enumtype); 6500 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype); 6501 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype); 6502 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype); 6503 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype); 6504 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype); 6505 } 6506 6507 /* Finish debugging output for this type. */ 6508 rest_of_type_compilation (enumtype, toplevel); 6509 6510 return enumtype; 6511} 6512 6513/* Build and install a CONST_DECL for one value of the 6514 current enumeration type (one that was begun with start_enum). 6515 Return a tree-list containing the CONST_DECL and its value. 6516 Assignment of sequential values by default is handled here. */ 6517 6518tree 6519build_enumerator (tree name, tree value) 6520{ 6521 tree decl, type; 6522 6523 /* Validate and default VALUE. */ 6524 6525 if (value != 0) 6526 { 6527 /* Don't issue more errors for error_mark_node (i.e. an 6528 undeclared identifier) - just ignore the value expression. */ 6529 if (value == error_mark_node) 6530 value = 0; 6531 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value)) 6532 || TREE_CODE (value) != INTEGER_CST) 6533 { 6534 error ("enumerator value for %qE is not an integer constant", name); 6535 value = 0; 6536 } 6537 else 6538 { 6539 value = default_conversion (value); 6540 constant_expression_warning (value); 6541 } 6542 } 6543 6544 /* Default based on previous value. */ 6545 /* It should no longer be possible to have NON_LVALUE_EXPR 6546 in the default. */ 6547 if (value == 0) 6548 { 6549 value = enum_next_value; 6550 if (enum_overflow) 6551 error ("overflow in enumeration values"); 6552 } 6553 6554 if (pedantic && !int_fits_type_p (value, integer_type_node)) 6555 { 6556 pedwarn ("ISO C restricts enumerator values to range of %<int%>"); 6557 /* XXX This causes -pedantic to change the meaning of the program. 6558 Remove? -zw 2004-03-15 */ 6559 value = convert (integer_type_node, value); 6560 } 6561 6562 /* Set basis for default for next value. */ 6563 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0); 6564 enum_overflow = tree_int_cst_lt (enum_next_value, value); 6565 6566 /* Now create a declaration for the enum value name. */ 6567 6568 type = TREE_TYPE (value); 6569 type = c_common_type_for_size (MAX (TYPE_PRECISION (type), 6570 TYPE_PRECISION (integer_type_node)), 6571 (TYPE_PRECISION (type) 6572 >= TYPE_PRECISION (integer_type_node) 6573 && TYPE_UNSIGNED (type))); 6574 6575 decl = build_decl (CONST_DECL, name, type); 6576 DECL_INITIAL (decl) = convert (type, value); 6577 pushdecl (decl); 6578 6579 return tree_cons (decl, value, NULL_TREE); 6580} 6581 6582 6583/* Create the FUNCTION_DECL for a function definition. 6584 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of 6585 the declaration; they describe the function's name and the type it returns, 6586 but twisted together in a fashion that parallels the syntax of C. 6587 6588 This function creates a binding context for the function body 6589 as well as setting up the FUNCTION_DECL in current_function_decl. 6590 6591 Returns 1 on success. If the DECLARATOR is not suitable for a function 6592 (it defines a datum instead), we return 0, which tells 6593 yyparse to report a parse error. */ 6594 6595int 6596start_function (struct c_declspecs *declspecs, struct c_declarator *declarator, 6597 tree attributes) 6598{ 6599 tree decl1, old_decl; 6600 tree restype, resdecl; 6601 struct c_label_context_se *nstack_se; 6602 struct c_label_context_vm *nstack_vm; 6603 6604 current_function_returns_value = 0; /* Assume, until we see it does. */ 6605 current_function_returns_null = 0; 6606 current_function_returns_abnormally = 0; 6607 warn_about_return_type = 0; 6608 c_switch_stack = NULL; 6609 6610 nstack_se = XOBNEW (&parser_obstack, struct c_label_context_se); 6611 nstack_se->labels_def = NULL; 6612 nstack_se->labels_used = NULL; 6613 nstack_se->next = label_context_stack_se; 6614 label_context_stack_se = nstack_se; 6615 6616 nstack_vm = XOBNEW (&parser_obstack, struct c_label_context_vm); 6617 nstack_vm->labels_def = NULL; 6618 nstack_vm->labels_used = NULL; 6619 nstack_vm->scope = 0; 6620 nstack_vm->next = label_context_stack_vm; 6621 label_context_stack_vm = nstack_vm; 6622 6623 /* Indicate no valid break/continue context by setting these variables 6624 to some non-null, non-label value. We'll notice and emit the proper 6625 error message in c_finish_bc_stmt. */ 6626 c_break_label = c_cont_label = size_zero_node; 6627 6628 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL); 6629 6630 /* If the declarator is not suitable for a function definition, 6631 cause a syntax error. */ 6632 if (decl1 == 0) 6633 { 6634 label_context_stack_se = label_context_stack_se->next; 6635 label_context_stack_vm = label_context_stack_vm->next; 6636 return 0; 6637 } 6638 6639 decl_attributes (&decl1, attributes, 0); 6640 6641 if (DECL_DECLARED_INLINE_P (decl1) 6642 && DECL_UNINLINABLE (decl1) 6643 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1))) 6644 warning (OPT_Wattributes, "inline function %q+D given attribute noinline", 6645 decl1); 6646 6647 /* Handle gnu_inline attribute. */ 6648 if (declspecs->inline_p 6649 && !flag_gnu89_inline 6650 && TREE_CODE (decl1) == FUNCTION_DECL 6651 && lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1))) 6652 { 6653 if (declspecs->storage_class != csc_static) 6654 DECL_EXTERNAL (decl1) = !DECL_EXTERNAL (decl1); 6655 } 6656 6657 announce_function (decl1); 6658 6659 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1)))) 6660 { 6661 error ("return type is an incomplete type"); 6662 /* Make it return void instead. */ 6663 TREE_TYPE (decl1) 6664 = build_function_type (void_type_node, 6665 TYPE_ARG_TYPES (TREE_TYPE (decl1))); 6666 } 6667 6668 if (warn_about_return_type) 6669 pedwarn_c99 ("return type defaults to %<int%>"); 6670 6671 /* Make the init_value nonzero so pushdecl knows this is not tentative. 6672 error_mark_node is replaced below (in pop_scope) with the BLOCK. */ 6673 DECL_INITIAL (decl1) = error_mark_node; 6674 6675 /* If this definition isn't a prototype and we had a prototype declaration 6676 before, copy the arg type info from that prototype. */ 6677 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope); 6678 if (old_decl && TREE_CODE (old_decl) != FUNCTION_DECL) 6679 old_decl = 0; 6680 current_function_prototype_locus = UNKNOWN_LOCATION; 6681 current_function_prototype_built_in = false; 6682 current_function_prototype_arg_types = NULL_TREE; 6683 if (TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0) 6684 { 6685 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE 6686 && comptypes (TREE_TYPE (TREE_TYPE (decl1)), 6687 TREE_TYPE (TREE_TYPE (old_decl)))) 6688 { 6689 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl), 6690 TREE_TYPE (decl1)); 6691 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl); 6692 current_function_prototype_built_in 6693 = C_DECL_BUILTIN_PROTOTYPE (old_decl); 6694 current_function_prototype_arg_types 6695 = TYPE_ARG_TYPES (TREE_TYPE (decl1)); 6696 } 6697 if (TREE_PUBLIC (decl1)) 6698 { 6699 /* If there is an external prototype declaration of this 6700 function, record its location but do not copy information 6701 to this decl. This may be an invisible declaration 6702 (built-in or in a scope which has finished) or simply 6703 have more refined argument types than any declaration 6704 found above. */ 6705 struct c_binding *b; 6706 for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed) 6707 if (B_IN_SCOPE (b, external_scope)) 6708 break; 6709 if (b) 6710 { 6711 tree ext_decl, ext_type; 6712 ext_decl = b->decl; 6713 ext_type = b->type ? b->type : TREE_TYPE (ext_decl); 6714 if (TREE_CODE (ext_type) == FUNCTION_TYPE 6715 && comptypes (TREE_TYPE (TREE_TYPE (decl1)), 6716 TREE_TYPE (ext_type))) 6717 { 6718 current_function_prototype_locus 6719 = DECL_SOURCE_LOCATION (ext_decl); 6720 current_function_prototype_built_in 6721 = C_DECL_BUILTIN_PROTOTYPE (ext_decl); 6722 current_function_prototype_arg_types 6723 = TYPE_ARG_TYPES (ext_type); 6724 } 6725 } 6726 } 6727 } 6728 6729 /* Optionally warn of old-fashioned def with no previous prototype. */ 6730 if (warn_strict_prototypes 6731 && old_decl != error_mark_node 6732 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0 6733 && C_DECL_ISNT_PROTOTYPE (old_decl)) 6734 warning (OPT_Wstrict_prototypes, 6735 "function declaration isn%'t a prototype"); 6736 /* Optionally warn of any global def with no previous prototype. */ 6737 else if (warn_missing_prototypes 6738 && old_decl != error_mark_node 6739 && TREE_PUBLIC (decl1) 6740 && !MAIN_NAME_P (DECL_NAME (decl1)) 6741 && C_DECL_ISNT_PROTOTYPE (old_decl)) 6742 warning (OPT_Wmissing_prototypes, "no previous prototype for %q+D", decl1); 6743 /* Optionally warn of any def with no previous prototype 6744 if the function has already been used. */ 6745 else if (warn_missing_prototypes 6746 && old_decl != 0 6747 && old_decl != error_mark_node 6748 && TREE_USED (old_decl) 6749 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0) 6750 warning (OPT_Wmissing_prototypes, 6751 "%q+D was used with no prototype before its definition", decl1); 6752 /* Optionally warn of any global def with no previous declaration. */ 6753 else if (warn_missing_declarations 6754 && TREE_PUBLIC (decl1) 6755 && old_decl == 0 6756 && !MAIN_NAME_P (DECL_NAME (decl1))) 6757 warning (OPT_Wmissing_declarations, "no previous declaration for %q+D", 6758 decl1); 6759 /* Optionally warn of any def with no previous declaration 6760 if the function has already been used. */ 6761 else if (warn_missing_declarations 6762 && old_decl != 0 6763 && old_decl != error_mark_node 6764 && TREE_USED (old_decl) 6765 && C_DECL_IMPLICIT (old_decl)) 6766 warning (OPT_Wmissing_declarations, 6767 "%q+D was used with no declaration before its definition", decl1); 6768 6769 /* This function exists in static storage. 6770 (This does not mean `static' in the C sense!) */ 6771 TREE_STATIC (decl1) = 1; 6772 6773 /* A nested function is not global. */ 6774 if (current_function_decl != 0) 6775 TREE_PUBLIC (decl1) = 0; 6776 6777 /* This is the earliest point at which we might know the assembler 6778 name of the function. Thus, if it's set before this, die horribly. */ 6779 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1)); 6780 6781 /* If #pragma weak was used, mark the decl weak now. */ 6782 if (current_scope == file_scope) 6783 maybe_apply_pragma_weak (decl1); 6784 6785 /* Warn for unlikely, improbable, or stupid declarations of `main'. */ 6786 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1))) 6787 { 6788 tree args; 6789 int argct = 0; 6790 6791 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1))) 6792 != integer_type_node) 6793 pedwarn ("return type of %q+D is not %<int%>", decl1); 6794 6795 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args; 6796 args = TREE_CHAIN (args)) 6797 { 6798 tree type = args ? TREE_VALUE (args) : 0; 6799 6800 if (type == void_type_node) 6801 break; 6802 6803 ++argct; 6804 switch (argct) 6805 { 6806 case 1: 6807 if (TYPE_MAIN_VARIANT (type) != integer_type_node) 6808 pedwarn ("first argument of %q+D should be %<int%>", decl1); 6809 break; 6810 6811 case 2: 6812 if (TREE_CODE (type) != POINTER_TYPE 6813 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE 6814 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type))) 6815 != char_type_node)) 6816 pedwarn ("second argument of %q+D should be %<char **%>", 6817 decl1); 6818 break; 6819 6820 case 3: 6821 if (TREE_CODE (type) != POINTER_TYPE 6822 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE 6823 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type))) 6824 != char_type_node)) 6825 pedwarn ("third argument of %q+D should probably be " 6826 "%<char **%>", decl1); 6827 break; 6828 } 6829 } 6830 6831 /* It is intentional that this message does not mention the third 6832 argument because it's only mentioned in an appendix of the 6833 standard. */ 6834 if (argct > 0 && (argct < 2 || argct > 3)) 6835 pedwarn ("%q+D takes only zero or two arguments", decl1); 6836 6837 if (!TREE_PUBLIC (decl1)) 6838 pedwarn ("%q+D is normally a non-static function", decl1); 6839 } 6840 6841 /* Record the decl so that the function name is defined. 6842 If we already have a decl for this name, and it is a FUNCTION_DECL, 6843 use the old decl. */ 6844 6845 current_function_decl = pushdecl (decl1); 6846 6847 push_scope (); 6848 declare_parm_level (); 6849 6850 restype = TREE_TYPE (TREE_TYPE (current_function_decl)); 6851 /* Promote the value to int before returning it. */ 6852 if (c_promoting_integer_type_p (restype)) 6853 { 6854 /* It retains unsignedness if not really getting wider. */ 6855 if (TYPE_UNSIGNED (restype) 6856 && (TYPE_PRECISION (restype) 6857 == TYPE_PRECISION (integer_type_node))) 6858 restype = unsigned_type_node; 6859 else 6860 restype = integer_type_node; 6861 } 6862 6863 resdecl = build_decl (RESULT_DECL, NULL_TREE, restype); 6864 DECL_ARTIFICIAL (resdecl) = 1; 6865 DECL_IGNORED_P (resdecl) = 1; 6866 DECL_RESULT (current_function_decl) = resdecl; 6867 6868 start_fname_decls (); 6869 6870 return 1; 6871} 6872 6873/* Subroutine of store_parm_decls which handles new-style function 6874 definitions (prototype format). The parms already have decls, so we 6875 need only record them as in effect and complain if any redundant 6876 old-style parm decls were written. */ 6877static void 6878store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info) 6879{ 6880 tree decl; 6881 6882 if (current_scope->bindings) 6883 { 6884 error ("%Jold-style parameter declarations in prototyped " 6885 "function definition", fndecl); 6886 6887 /* Get rid of the old-style declarations. */ 6888 pop_scope (); 6889 push_scope (); 6890 } 6891 /* Don't issue this warning for nested functions, and don't issue this 6892 warning if we got here because ARG_INFO_TYPES was error_mark_node 6893 (this happens when a function definition has just an ellipsis in 6894 its parameter list). */ 6895 else if (!in_system_header && !current_function_scope 6896 && arg_info->types != error_mark_node) 6897 warning (OPT_Wtraditional, 6898 "%Jtraditional C rejects ISO C style function definitions", 6899 fndecl); 6900 6901 /* Now make all the parameter declarations visible in the function body. 6902 We can bypass most of the grunt work of pushdecl. */ 6903 for (decl = arg_info->parms; decl; decl = TREE_CHAIN (decl)) 6904 { 6905 DECL_CONTEXT (decl) = current_function_decl; 6906 if (DECL_NAME (decl)) 6907 { 6908 bind (DECL_NAME (decl), decl, current_scope, 6909 /*invisible=*/false, /*nested=*/false); 6910 if (!TREE_USED (decl)) 6911 warn_if_shadowing (decl); 6912 } 6913 else 6914 error ("%Jparameter name omitted", decl); 6915 } 6916 6917 /* Record the parameter list in the function declaration. */ 6918 DECL_ARGUMENTS (fndecl) = arg_info->parms; 6919 6920 /* Now make all the ancillary declarations visible, likewise. */ 6921 for (decl = arg_info->others; decl; decl = TREE_CHAIN (decl)) 6922 { 6923 DECL_CONTEXT (decl) = current_function_decl; 6924 if (DECL_NAME (decl)) 6925 bind (DECL_NAME (decl), decl, current_scope, 6926 /*invisible=*/false, /*nested=*/false); 6927 } 6928 6929 /* And all the tag declarations. */ 6930 for (decl = arg_info->tags; decl; decl = TREE_CHAIN (decl)) 6931 if (TREE_PURPOSE (decl)) 6932 bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope, 6933 /*invisible=*/false, /*nested=*/false); 6934} 6935 6936/* Subroutine of store_parm_decls which handles old-style function 6937 definitions (separate parameter list and declarations). */ 6938 6939static void 6940store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info) 6941{ 6942 struct c_binding *b; 6943 tree parm, decl, last; 6944 tree parmids = arg_info->parms; 6945 struct pointer_set_t *seen_args = pointer_set_create (); 6946 6947 if (!in_system_header) 6948 warning (OPT_Wold_style_definition, "%Jold-style function definition", 6949 fndecl); 6950 6951 /* Match each formal parameter name with its declaration. Save each 6952 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */ 6953 for (parm = parmids; parm; parm = TREE_CHAIN (parm)) 6954 { 6955 if (TREE_VALUE (parm) == 0) 6956 { 6957 error ("%Jparameter name missing from parameter list", fndecl); 6958 TREE_PURPOSE (parm) = 0; 6959 continue; 6960 } 6961 6962 b = I_SYMBOL_BINDING (TREE_VALUE (parm)); 6963 if (b && B_IN_CURRENT_SCOPE (b)) 6964 { 6965 decl = b->decl; 6966 /* If we got something other than a PARM_DECL it is an error. */ 6967 if (TREE_CODE (decl) != PARM_DECL) 6968 error ("%q+D declared as a non-parameter", decl); 6969 /* If the declaration is already marked, we have a duplicate 6970 name. Complain and ignore the duplicate. */ 6971 else if (pointer_set_contains (seen_args, decl)) 6972 { 6973 error ("multiple parameters named %q+D", decl); 6974 TREE_PURPOSE (parm) = 0; 6975 continue; 6976 } 6977 /* If the declaration says "void", complain and turn it into 6978 an int. */ 6979 else if (VOID_TYPE_P (TREE_TYPE (decl))) 6980 { 6981 error ("parameter %q+D declared with void type", decl); 6982 TREE_TYPE (decl) = integer_type_node; 6983 DECL_ARG_TYPE (decl) = integer_type_node; 6984 layout_decl (decl, 0); 6985 } 6986 warn_if_shadowing (decl); 6987 } 6988 /* If no declaration found, default to int. */ 6989 else 6990 { 6991 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node); 6992 DECL_ARG_TYPE (decl) = TREE_TYPE (decl); 6993 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl); 6994 pushdecl (decl); 6995 warn_if_shadowing (decl); 6996 6997 if (flag_isoc99) 6998 pedwarn ("type of %q+D defaults to %<int%>", decl); 6999 else if (extra_warnings) 7000 warning (OPT_Wextra, "type of %q+D defaults to %<int%>", decl); 7001 } 7002 7003 TREE_PURPOSE (parm) = decl; 7004 pointer_set_insert (seen_args, decl); 7005 } 7006 7007 /* Now examine the parms chain for incomplete declarations 7008 and declarations with no corresponding names. */ 7009 7010 for (b = current_scope->bindings; b; b = b->prev) 7011 { 7012 parm = b->decl; 7013 if (TREE_CODE (parm) != PARM_DECL) 7014 continue; 7015 7016 if (TREE_TYPE (parm) != error_mark_node 7017 && !COMPLETE_TYPE_P (TREE_TYPE (parm))) 7018 { 7019 error ("parameter %q+D has incomplete type", parm); 7020 TREE_TYPE (parm) = error_mark_node; 7021 } 7022 7023 if (!pointer_set_contains (seen_args, parm)) 7024 { 7025 error ("declaration for parameter %q+D but no such parameter", parm); 7026 7027 /* Pretend the parameter was not missing. 7028 This gets us to a standard state and minimizes 7029 further error messages. */ 7030 parmids = chainon (parmids, tree_cons (parm, 0, 0)); 7031 } 7032 } 7033 7034 /* Chain the declarations together in the order of the list of 7035 names. Store that chain in the function decl, replacing the 7036 list of names. Update the current scope to match. */ 7037 DECL_ARGUMENTS (fndecl) = 0; 7038 7039 for (parm = parmids; parm; parm = TREE_CHAIN (parm)) 7040 if (TREE_PURPOSE (parm)) 7041 break; 7042 if (parm && TREE_PURPOSE (parm)) 7043 { 7044 last = TREE_PURPOSE (parm); 7045 DECL_ARGUMENTS (fndecl) = last; 7046 7047 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm)) 7048 if (TREE_PURPOSE (parm)) 7049 { 7050 TREE_CHAIN (last) = TREE_PURPOSE (parm); 7051 last = TREE_PURPOSE (parm); 7052 } 7053 TREE_CHAIN (last) = 0; 7054 } 7055 7056 pointer_set_destroy (seen_args); 7057 7058 /* If there was a previous prototype, 7059 set the DECL_ARG_TYPE of each argument according to 7060 the type previously specified, and report any mismatches. */ 7061 7062 if (current_function_prototype_arg_types) 7063 { 7064 tree type; 7065 for (parm = DECL_ARGUMENTS (fndecl), 7066 type = current_function_prototype_arg_types; 7067 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type)) 7068 != void_type_node)); 7069 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type)) 7070 { 7071 if (parm == 0 || type == 0 7072 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node) 7073 { 7074 if (current_function_prototype_built_in) 7075 warning (0, "number of arguments doesn%'t match " 7076 "built-in prototype"); 7077 else 7078 { 7079 error ("number of arguments doesn%'t match prototype"); 7080 error ("%Hprototype declaration", 7081 ¤t_function_prototype_locus); 7082 } 7083 break; 7084 } 7085 /* Type for passing arg must be consistent with that 7086 declared for the arg. ISO C says we take the unqualified 7087 type for parameters declared with qualified type. */ 7088 if (!comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)), 7089 TYPE_MAIN_VARIANT (TREE_VALUE (type)))) 7090 { 7091 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) 7092 == TYPE_MAIN_VARIANT (TREE_VALUE (type))) 7093 { 7094 /* Adjust argument to match prototype. E.g. a previous 7095 `int foo(float);' prototype causes 7096 `int foo(x) float x; {...}' to be treated like 7097 `int foo(float x) {...}'. This is particularly 7098 useful for argument types like uid_t. */ 7099 DECL_ARG_TYPE (parm) = TREE_TYPE (parm); 7100 7101 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl)) 7102 && INTEGRAL_TYPE_P (TREE_TYPE (parm)) 7103 && TYPE_PRECISION (TREE_TYPE (parm)) 7104 < TYPE_PRECISION (integer_type_node)) 7105 DECL_ARG_TYPE (parm) = integer_type_node; 7106 7107 if (pedantic) 7108 { 7109 /* ??? Is it possible to get here with a 7110 built-in prototype or will it always have 7111 been diagnosed as conflicting with an 7112 old-style definition and discarded? */ 7113 if (current_function_prototype_built_in) 7114 warning (0, "promoted argument %qD " 7115 "doesn%'t match built-in prototype", parm); 7116 else 7117 { 7118 pedwarn ("promoted argument %qD " 7119 "doesn%'t match prototype", parm); 7120 pedwarn ("%Hprototype declaration", 7121 ¤t_function_prototype_locus); 7122 } 7123 } 7124 } 7125 else 7126 { 7127 if (current_function_prototype_built_in) 7128 warning (0, "argument %qD doesn%'t match " 7129 "built-in prototype", parm); 7130 else 7131 { 7132 error ("argument %qD doesn%'t match prototype", parm); 7133 error ("%Hprototype declaration", 7134 ¤t_function_prototype_locus); 7135 } 7136 } 7137 } 7138 } 7139 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0; 7140 } 7141 7142 /* Otherwise, create a prototype that would match. */ 7143 7144 else 7145 { 7146 tree actual = 0, last = 0, type; 7147 7148 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm)) 7149 { 7150 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE); 7151 if (last) 7152 TREE_CHAIN (last) = type; 7153 else 7154 actual = type; 7155 last = type; 7156 } 7157 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE); 7158 if (last) 7159 TREE_CHAIN (last) = type; 7160 else 7161 actual = type; 7162 7163 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES 7164 of the type of this function, but we need to avoid having this 7165 affect the types of other similarly-typed functions, so we must 7166 first force the generation of an identical (but separate) type 7167 node for the relevant function type. The new node we create 7168 will be a variant of the main variant of the original function 7169 type. */ 7170 7171 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl)); 7172 7173 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual; 7174 } 7175} 7176 7177/* Store parameter declarations passed in ARG_INFO into the current 7178 function declaration. */ 7179 7180void 7181store_parm_decls_from (struct c_arg_info *arg_info) 7182{ 7183 current_function_arg_info = arg_info; 7184 store_parm_decls (); 7185} 7186 7187/* Store the parameter declarations into the current function declaration. 7188 This is called after parsing the parameter declarations, before 7189 digesting the body of the function. 7190 7191 For an old-style definition, construct a prototype out of the old-style 7192 parameter declarations and inject it into the function's type. */ 7193 7194void 7195store_parm_decls (void) 7196{ 7197 tree fndecl = current_function_decl; 7198 bool proto; 7199 7200 /* The argument information block for FNDECL. */ 7201 struct c_arg_info *arg_info = current_function_arg_info; 7202 current_function_arg_info = 0; 7203 7204 /* True if this definition is written with a prototype. Note: 7205 despite C99 6.7.5.3p14, we can *not* treat an empty argument 7206 list in a function definition as equivalent to (void) -- an 7207 empty argument list specifies the function has no parameters, 7208 but only (void) sets up a prototype for future calls. */ 7209 proto = arg_info->types != 0; 7210 7211 if (proto) 7212 store_parm_decls_newstyle (fndecl, arg_info); 7213 else 7214 store_parm_decls_oldstyle (fndecl, arg_info); 7215 7216 /* The next call to push_scope will be a function body. */ 7217 7218 next_is_function_body = true; 7219 7220 /* Write a record describing this function definition to the prototypes 7221 file (if requested). */ 7222 7223 gen_aux_info_record (fndecl, 1, 0, proto); 7224 7225 /* Initialize the RTL code for the function. */ 7226 allocate_struct_function (fndecl); 7227 7228 /* Begin the statement tree for this function. */ 7229 DECL_SAVED_TREE (fndecl) = push_stmt_list (); 7230 7231 /* ??? Insert the contents of the pending sizes list into the function 7232 to be evaluated. The only reason left to have this is 7233 void foo(int n, int array[n++]) 7234 because we throw away the array type in favor of a pointer type, and 7235 thus won't naturally see the SAVE_EXPR containing the increment. All 7236 other pending sizes would be handled by gimplify_parameters. */ 7237 { 7238 tree t; 7239 for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t)) 7240 add_stmt (TREE_VALUE (t)); 7241 } 7242 7243 /* Even though we're inside a function body, we still don't want to 7244 call expand_expr to calculate the size of a variable-sized array. 7245 We haven't necessarily assigned RTL to all variables yet, so it's 7246 not safe to try to expand expressions involving them. */ 7247 cfun->x_dont_save_pending_sizes_p = 1; 7248} 7249 7250/* Emit diagnostics that require gimple input for detection. Operate on 7251 FNDECL and all its nested functions. */ 7252 7253static void 7254c_gimple_diagnostics_recursively (tree fndecl) 7255{ 7256 struct cgraph_node *cgn; 7257 7258 /* Handle attribute((warn_unused_result)). Relies on gimple input. */ 7259 c_warn_unused_result (&DECL_SAVED_TREE (fndecl)); 7260 7261 /* Notice when OpenMP structured block constraints are violated. */ 7262 if (flag_openmp) 7263 diagnose_omp_structured_block_errors (fndecl); 7264 7265 /* Finalize all nested functions now. */ 7266 cgn = cgraph_node (fndecl); 7267 for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested) 7268 c_gimple_diagnostics_recursively (cgn->decl); 7269} 7270 7271/* Finish up a function declaration and compile that function 7272 all the way to assembler language output. The free the storage 7273 for the function definition. 7274 7275 This is called after parsing the body of the function definition. */ 7276 7277void 7278finish_function (void) 7279{ 7280 tree fndecl = current_function_decl; 7281 7282 label_context_stack_se = label_context_stack_se->next; 7283 label_context_stack_vm = label_context_stack_vm->next; 7284 7285 if (TREE_CODE (fndecl) == FUNCTION_DECL 7286 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl))) 7287 { 7288 tree args = DECL_ARGUMENTS (fndecl); 7289 for (; args; args = TREE_CHAIN (args)) 7290 { 7291 tree type = TREE_TYPE (args); 7292 if (INTEGRAL_TYPE_P (type) 7293 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node)) 7294 DECL_ARG_TYPE (args) = integer_type_node; 7295 } 7296 } 7297 7298 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node) 7299 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl; 7300 7301 /* Must mark the RESULT_DECL as being in this function. */ 7302 7303 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node) 7304 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl; 7305 7306 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted) 7307 { 7308 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) 7309 != integer_type_node) 7310 { 7311 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned. 7312 If warn_main is -1 (-Wno-main) we don't want to be warned. */ 7313 if (!warn_main) 7314 pedwarn ("return type of %q+D is not %<int%>", fndecl); 7315 } 7316 else 7317 { 7318 if (flag_isoc99) 7319 { 7320 tree stmt = c_finish_return (integer_zero_node); 7321#ifdef USE_MAPPED_LOCATION 7322 /* Hack. We don't want the middle-end to warn that this return 7323 is unreachable, so we mark its location as special. Using 7324 UNKNOWN_LOCATION has the problem that it gets clobbered in 7325 annotate_one_with_locus. A cleaner solution might be to 7326 ensure ! should_carry_locus_p (stmt), but that needs a flag. 7327 */ 7328 SET_EXPR_LOCATION (stmt, BUILTINS_LOCATION); 7329#else 7330 /* Hack. We don't want the middle-end to warn that this 7331 return is unreachable, so put the statement on the 7332 special line 0. */ 7333 annotate_with_file_line (stmt, input_filename, 0); 7334#endif 7335 } 7336 } 7337 } 7338 7339 /* Tie off the statement tree for this function. */ 7340 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl)); 7341 7342 finish_fname_decls (); 7343 7344 /* Complain if there's just no return statement. */ 7345 if (warn_return_type 7346 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE 7347 && !current_function_returns_value && !current_function_returns_null 7348 /* Don't complain if we are no-return. */ 7349 && !current_function_returns_abnormally 7350 /* Don't warn for main(). */ 7351 && !MAIN_NAME_P (DECL_NAME (fndecl)) 7352 /* Or if they didn't actually specify a return type. */ 7353 && !C_FUNCTION_IMPLICIT_INT (fndecl) 7354 /* Normally, with -Wreturn-type, flow will complain. Unless we're an 7355 inline function, as we might never be compiled separately. */ 7356 && DECL_INLINE (fndecl)) 7357 { 7358 warning (OPT_Wreturn_type, 7359 "no return statement in function returning non-void"); 7360 TREE_NO_WARNING (fndecl) = 1; 7361 } 7362 7363 /* With just -Wextra, complain only if function returns both with 7364 and without a value. */ 7365 if (extra_warnings 7366 && current_function_returns_value 7367 && current_function_returns_null) 7368 warning (OPT_Wextra, "this function may return with or without a value"); 7369 7370 /* Store the end of the function, so that we get good line number 7371 info for the epilogue. */ 7372 cfun->function_end_locus = input_location; 7373 7374 /* If we don't have ctors/dtors sections, and this is a static 7375 constructor or destructor, it must be recorded now. */ 7376 if (DECL_STATIC_CONSTRUCTOR (fndecl) 7377 && !targetm.have_ctors_dtors) 7378 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors); 7379 if (DECL_STATIC_DESTRUCTOR (fndecl) 7380 && !targetm.have_ctors_dtors) 7381 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors); 7382 7383 /* Finalize the ELF visibility for the function. */ 7384 c_determine_visibility (fndecl); 7385 7386 /* Genericize before inlining. Delay genericizing nested functions 7387 until their parent function is genericized. Since finalizing 7388 requires GENERIC, delay that as well. */ 7389 7390 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node 7391 && !undef_nested_function) 7392 { 7393 if (!decl_function_context (fndecl)) 7394 { 7395 c_genericize (fndecl); 7396 c_gimple_diagnostics_recursively (fndecl); 7397 7398 /* ??? Objc emits functions after finalizing the compilation unit. 7399 This should be cleaned up later and this conditional removed. */ 7400 if (cgraph_global_info_ready) 7401 { 7402 c_expand_body (fndecl); 7403 return; 7404 } 7405 7406 cgraph_finalize_function (fndecl, false); 7407 } 7408 else 7409 { 7410 /* Register this function with cgraph just far enough to get it 7411 added to our parent's nested function list. Handy, since the 7412 C front end doesn't have such a list. */ 7413 (void) cgraph_node (fndecl); 7414 } 7415 } 7416 7417 if (!decl_function_context (fndecl)) 7418 undef_nested_function = false; 7419 7420 /* We're leaving the context of this function, so zap cfun. 7421 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in 7422 tree_rest_of_compilation. */ 7423 cfun = NULL; 7424 current_function_decl = NULL; 7425} 7426 7427/* Generate the RTL for the body of FNDECL. */ 7428 7429void 7430c_expand_body (tree fndecl) 7431{ 7432 7433 if (!DECL_INITIAL (fndecl) 7434 || DECL_INITIAL (fndecl) == error_mark_node) 7435 return; 7436 7437 tree_rest_of_compilation (fndecl); 7438 7439 if (DECL_STATIC_CONSTRUCTOR (fndecl) 7440 && targetm.have_ctors_dtors) 7441 targetm.asm_out.constructor (XEXP (DECL_RTL (fndecl), 0), 7442 DEFAULT_INIT_PRIORITY); 7443 if (DECL_STATIC_DESTRUCTOR (fndecl) 7444 && targetm.have_ctors_dtors) 7445 targetm.asm_out.destructor (XEXP (DECL_RTL (fndecl), 0), 7446 DEFAULT_INIT_PRIORITY); 7447} 7448 7449/* Check the declarations given in a for-loop for satisfying the C99 7450 constraints. If exactly one such decl is found, return it. */ 7451 7452tree 7453check_for_loop_decls (void) 7454{ 7455 struct c_binding *b; 7456 tree one_decl = NULL_TREE; 7457 int n_decls = 0; 7458 7459 7460 if (!flag_isoc99) 7461 { 7462 /* If we get here, declarations have been used in a for loop without 7463 the C99 for loop scope. This doesn't make much sense, so don't 7464 allow it. */ 7465 error ("%<for%> loop initial declaration used outside C99 mode"); 7466 return NULL_TREE; 7467 } 7468 /* C99 subclause 6.8.5 paragraph 3: 7469 7470 [#3] The declaration part of a for statement shall only 7471 declare identifiers for objects having storage class auto or 7472 register. 7473 7474 It isn't clear whether, in this sentence, "identifiers" binds to 7475 "shall only declare" or to "objects" - that is, whether all identifiers 7476 declared must be identifiers for objects, or whether the restriction 7477 only applies to those that are. (A question on this in comp.std.c 7478 in November 2000 received no answer.) We implement the strictest 7479 interpretation, to avoid creating an extension which later causes 7480 problems. */ 7481 7482 for (b = current_scope->bindings; b; b = b->prev) 7483 { 7484 tree id = b->id; 7485 tree decl = b->decl; 7486 7487 if (!id) 7488 continue; 7489 7490 switch (TREE_CODE (decl)) 7491 { 7492 case VAR_DECL: 7493 if (TREE_STATIC (decl)) 7494 error ("declaration of static variable %q+D in %<for%> loop " 7495 "initial declaration", decl); 7496 else if (DECL_EXTERNAL (decl)) 7497 error ("declaration of %<extern%> variable %q+D in %<for%> loop " 7498 "initial declaration", decl); 7499 break; 7500 7501 case RECORD_TYPE: 7502 error ("%<struct %E%> declared in %<for%> loop initial declaration", 7503 id); 7504 break; 7505 case UNION_TYPE: 7506 error ("%<union %E%> declared in %<for%> loop initial declaration", 7507 id); 7508 break; 7509 case ENUMERAL_TYPE: 7510 error ("%<enum %E%> declared in %<for%> loop initial declaration", 7511 id); 7512 break; 7513 /* APPLE LOCAL begin radar 6268817 */ 7514 case FUNCTION_DECL: 7515 /* Block helper function can be declared in the statement block 7516 for the for-loop declarations. */ 7517 if (BLOCK_SYNTHESIZED_FUNC (decl)) 7518 break; 7519 /* APPLE LOCAL end radar 6268817 */ 7520 default: 7521 error ("declaration of non-variable %q+D in %<for%> loop " 7522 "initial declaration", decl); 7523 } 7524 7525 n_decls++; 7526 one_decl = decl; 7527 } 7528 7529 return n_decls == 1 ? one_decl : NULL_TREE; 7530} 7531 7532/* Save and reinitialize the variables 7533 used during compilation of a C function. */ 7534 7535void 7536c_push_function_context (struct function *f) 7537{ 7538 struct language_function *p; 7539 p = GGC_NEW (struct language_function); 7540 f->language = p; 7541 7542 p->base.x_stmt_tree = c_stmt_tree; 7543 p->x_break_label = c_break_label; 7544 p->x_cont_label = c_cont_label; 7545 p->x_switch_stack = c_switch_stack; 7546 p->arg_info = current_function_arg_info; 7547 p->returns_value = current_function_returns_value; 7548 p->returns_null = current_function_returns_null; 7549 p->returns_abnormally = current_function_returns_abnormally; 7550 p->warn_about_return_type = warn_about_return_type; 7551} 7552 7553/* Restore the variables used during compilation of a C function. */ 7554 7555void 7556c_pop_function_context (struct function *f) 7557{ 7558 struct language_function *p = f->language; 7559 7560 /* APPLE LOCAL begin blocks 6040305 */ 7561 if (current_function_decl 7562 && DECL_STRUCT_FUNCTION (current_function_decl) == 0 7563 /* APPLE LOCAL end blocks 6040305 */ 7564 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE) 7565 { 7566 /* Stop pointing to the local nodes about to be freed. */ 7567 /* But DECL_INITIAL must remain nonzero so we know this 7568 was an actual function definition. */ 7569 DECL_INITIAL (current_function_decl) = error_mark_node; 7570 DECL_ARGUMENTS (current_function_decl) = 0; 7571 } 7572 7573 c_stmt_tree = p->base.x_stmt_tree; 7574 c_break_label = p->x_break_label; 7575 c_cont_label = p->x_cont_label; 7576 c_switch_stack = p->x_switch_stack; 7577 current_function_arg_info = p->arg_info; 7578 current_function_returns_value = p->returns_value; 7579 current_function_returns_null = p->returns_null; 7580 current_function_returns_abnormally = p->returns_abnormally; 7581 warn_about_return_type = p->warn_about_return_type; 7582 7583 f->language = NULL; 7584} 7585 7586/* Copy the DECL_LANG_SPECIFIC data associated with DECL. */ 7587 7588void 7589c_dup_lang_specific_decl (tree decl) 7590{ 7591 struct lang_decl *ld; 7592 7593 if (!DECL_LANG_SPECIFIC (decl)) 7594 return; 7595 7596 ld = GGC_NEW (struct lang_decl); 7597 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl)); 7598 DECL_LANG_SPECIFIC (decl) = ld; 7599} 7600 7601/* The functions below are required for functionality of doing 7602 function at once processing in the C front end. Currently these 7603 functions are not called from anywhere in the C front end, but as 7604 these changes continue, that will change. */ 7605 7606/* Returns the stmt_tree (if any) to which statements are currently 7607 being added. If there is no active statement-tree, NULL is 7608 returned. */ 7609 7610stmt_tree 7611current_stmt_tree (void) 7612{ 7613 return &c_stmt_tree; 7614} 7615 7616/* Nonzero if TYPE is an anonymous union or struct type. Always 0 in 7617 C. */ 7618 7619int 7620anon_aggr_type_p (tree ARG_UNUSED (node)) 7621{ 7622 return 0; 7623} 7624 7625/* Return the global value of T as a symbol. */ 7626 7627tree 7628identifier_global_value (tree t) 7629{ 7630 struct c_binding *b; 7631 7632 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed) 7633 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b)) 7634 return b->decl; 7635 7636 return 0; 7637} 7638 7639/* Record a builtin type for C. If NAME is non-NULL, it is the name used; 7640 otherwise the name is found in ridpointers from RID_INDEX. */ 7641 7642void 7643record_builtin_type (enum rid rid_index, const char *name, tree type) 7644{ 7645 tree id, decl; 7646 if (name == 0) 7647 id = ridpointers[(int) rid_index]; 7648 else 7649 id = get_identifier (name); 7650 decl = build_decl (TYPE_DECL, id, type); 7651 pushdecl (decl); 7652 if (debug_hooks->type_decl) 7653 debug_hooks->type_decl (decl, false); 7654} 7655 7656/* Build the void_list_node (void_type_node having been created). */ 7657tree 7658build_void_list_node (void) 7659{ 7660 tree t = build_tree_list (NULL_TREE, void_type_node); 7661 return t; 7662} 7663 7664/* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */ 7665 7666struct c_parm * 7667build_c_parm (struct c_declspecs *specs, tree attrs, 7668 struct c_declarator *declarator) 7669{ 7670 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm); 7671 ret->specs = specs; 7672 ret->attrs = attrs; 7673 ret->declarator = declarator; 7674 return ret; 7675} 7676 7677/* Return a declarator with nested attributes. TARGET is the inner 7678 declarator to which these attributes apply. ATTRS are the 7679 attributes. */ 7680 7681struct c_declarator * 7682build_attrs_declarator (tree attrs, struct c_declarator *target) 7683{ 7684 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator); 7685 ret->kind = cdk_attrs; 7686 ret->declarator = target; 7687 ret->u.attrs = attrs; 7688 return ret; 7689} 7690 7691/* Return a declarator for a function with arguments specified by ARGS 7692 and return type specified by TARGET. */ 7693 7694struct c_declarator * 7695build_function_declarator (struct c_arg_info *args, 7696 struct c_declarator *target) 7697{ 7698 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator); 7699 ret->kind = cdk_function; 7700 ret->declarator = target; 7701 ret->u.arg_info = args; 7702 return ret; 7703} 7704 7705/* Return a declarator for the identifier IDENT (which may be 7706 NULL_TREE for an abstract declarator). */ 7707 7708struct c_declarator * 7709build_id_declarator (tree ident) 7710{ 7711 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator); 7712 ret->kind = cdk_id; 7713 ret->declarator = 0; 7714 ret->u.id = ident; 7715 /* Default value - may get reset to a more precise location. */ 7716 ret->id_loc = input_location; 7717 return ret; 7718} 7719 7720/* Return something to represent absolute declarators containing a *. 7721 TARGET is the absolute declarator that the * contains. 7722 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes 7723 to apply to the pointer type. */ 7724 7725struct c_declarator * 7726make_pointer_declarator (struct c_declspecs *type_quals_attrs, 7727 struct c_declarator *target) 7728{ 7729 tree attrs; 7730 int quals = 0; 7731 struct c_declarator *itarget = target; 7732 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator); 7733 if (type_quals_attrs) 7734 { 7735 attrs = type_quals_attrs->attrs; 7736 quals = quals_from_declspecs (type_quals_attrs); 7737 if (attrs != NULL_TREE) 7738 itarget = build_attrs_declarator (attrs, target); 7739 } 7740 ret->kind = cdk_pointer; 7741 ret->declarator = itarget; 7742 ret->u.pointer_quals = quals; 7743 return ret; 7744} 7745 7746/* APPLE LOCAL begin radar 5932809 - copyable byref blocks (C++ ch) */ 7747/* build_byref_local_var_access - converts EXPR to: 7748 EXPR.__forwarding-><decl-name>. 7749*/ 7750tree 7751build_byref_local_var_access (tree expr, tree decl_name) 7752{ 7753 tree exp = build_component_ref (expr, get_identifier ("__forwarding")); 7754 exp = build_indirect_ref (exp, "unary *"); 7755 exp = build_component_ref (exp, decl_name); 7756 return exp; 7757} 7758/* APPLE LOCAL end radar 5932809 - copyable byref blocks (C++ ch) */ 7759/* APPLE LOCAL begin radar 5732232 - blocks (C++ ch) */ 7760/** 7761 build_block_byref_decl - This routine inserts a variable declared as a 7762 'byref' variable using the |...| syntax in helper function's outer-most scope. 7763*/ 7764tree 7765build_block_byref_decl (tree name, tree decl, tree exp) 7766{ 7767 struct c_scope *scope = current_scope; 7768 tree ptr_type, byref_decl; 7769 /* APPLE LOCAL begin radar 6225809 */ 7770 if (cur_block->prev_block_info) { 7771 /* Traverse enclosing blocks. Insert a __block variable in 7772 each enclosing block which has no declaration of this 7773 variable. This is to ensure that the current (inner) block 7774 gets the __block version of the variable; */ 7775 struct block_sema_info *cb = cur_block->prev_block_info; 7776 while (cb) { 7777 struct c_binding *b = I_SYMBOL_BINDING (name); 7778 /* Find the first declaration not in current block. */ 7779 while (b && b->decl 7780 && (TREE_CODE (b->decl) == VAR_DECL 7781 || TREE_CODE (b->decl) == PARM_DECL) 7782 && b->depth >= cur_block->the_scope->depth) 7783 b = b->shadowed; 7784 7785 /* Is the next declaration not in enclosing block? */ 7786 if (b && b->decl 7787 && (TREE_CODE (b->decl) == VAR_DECL 7788 || TREE_CODE (b->decl) == PARM_DECL) 7789 && b->depth < cb->the_scope->depth) { 7790 /* No declaration of variable seen in the block. Must insert one. */ 7791 struct c_scope *save_scope = current_scope; 7792 struct block_sema_info *save_current_block = cur_block; 7793 current_scope = cb->the_scope; 7794 cur_block = cb; 7795 decl = build_block_byref_decl (name, decl, exp); 7796 cur_block = save_current_block; 7797 current_scope = save_scope; 7798 } 7799 cb = cb->prev_block_info; 7800 } 7801 } 7802 /* APPLE LOCAL end radar 6225809 */ 7803 7804 /* If it is already a byref declaration, do not add the pointer type 7805 because such declarations already have the pointer type 7806 added. This happens when we have two nested byref declarations in 7807 nested blocks. */ 7808 ptr_type = (TREE_CODE (decl) == VAR_DECL && BLOCK_DECL_BYREF (decl)) 7809 ? TREE_TYPE (decl) : build_pointer_type (TREE_TYPE (decl)); 7810 byref_decl = build_decl (VAR_DECL, name, ptr_type); 7811 /* APPLE LOCAL begin radars 6144664 & 6145471 */ 7812 DECL_SOURCE_LOCATION (byref_decl) = DECL_SOURCE_LOCATION 7813 (cur_block->helper_func_decl); 7814 /* APPLE LOCAL end radars 6144664 & 6145471 */ 7815 BLOCK_DECL_BYREF (byref_decl) = 1; 7816 7817 /* APPLE LOCAL begin radar 5932809 - copyable byref blocks (C++ ch) */ 7818 if (TREE_CODE (decl) == VAR_DECL && COPYABLE_BYREF_LOCAL_VAR (decl)) 7819 { 7820 COPYABLE_BYREF_LOCAL_VAR (byref_decl) = 1; 7821 COPYABLE_BYREF_LOCAL_NONPOD (byref_decl) = COPYABLE_BYREF_LOCAL_NONPOD (decl); 7822 /* APPLE LOCAL radar 5847976 */ 7823 COPYABLE_WEAK_BLOCK (byref_decl) = COPYABLE_WEAK_BLOCK (decl); 7824 } 7825 /* APPLE LOCAL end radar 5932809 - copyable byref blocks (C++ ch) */ 7826 7827 /* In the presence of nested "{" 7828 move up the scope chain until reaching the main function body's scope. 7829 */ 7830 while (scope && !scope->function_body) 7831 scope = scope->outer; 7832 /* Current scope must be that of the main function body. */ 7833 gcc_assert (scope && scope->function_body); 7834 bind (name, byref_decl, 7835 scope, /*invisible=*/false, /*nested=*/false); 7836 cur_block->block_byref_decl_list = 7837 tree_cons (NULL_TREE, byref_decl, cur_block->block_byref_decl_list); 7838 /* APPLE LOCAL radar 5847213 - building block_original_byref_decl_list list removed. */ 7839 /* APPLE LOCAL begin radar 6289031 */ 7840#if 0 7841 if (! flag_objc_gc_only) 7842#endif 7843 push_cleanup (byref_decl, build_block_byref_release_exp (byref_decl), false); 7844 /* APPLE LOCAL end radar 6289031 */ 7845 7846 return byref_decl; 7847} 7848 7849/** 7850 build_block_ref_decl - This routine inserts a copied-in variable (a variable 7851 referenced in the block but whose scope is outside the block) in helper 7852 function's outer-most scope. It also sets its type to 'const' as such 7853 variables are read-only. 7854*/ 7855tree 7856build_block_ref_decl (tree name, tree decl) 7857{ 7858 struct c_scope *scope = current_scope; 7859 tree ref_decl; 7860 /* APPLE LOCAL radar 6212722 */ 7861 tree type, exp; 7862 /* APPLE LOCAL begin radar 5932809 - copyable byref blocks (C++ ch) */ 7863 /* 'decl' was previously declared as __block. Simply, copy the value 7864 embedded in the above variable. */ 7865 if (TREE_CODE (decl) == VAR_DECL && COPYABLE_BYREF_LOCAL_VAR (decl)) 7866 decl = build_byref_local_var_access (decl, DECL_NAME (decl)); 7867 else { 7868 /* APPLE LOCAL begin radar 5988451 (C++ ch) */ 7869 if (cur_block->prev_block_info) { 7870 /* Traverse enclosing blocks. Insert a copied-in variable in 7871 each enclosing block which has no declaration of this 7872 variable. This is to ensure that the current (inner) block 7873 has the 'frozen' value of the copied-in variable; which means 7874 the value of the copied in variable is at the point of the 7875 block declaration and *not* when the inner block is 7876 invoked. */ 7877 struct block_sema_info *cb = cur_block->prev_block_info; 7878 while (cb) { 7879 struct c_binding *b = I_SYMBOL_BINDING (name); 7880 /* Find the first declaration not in current block. */ 7881 while (b && b->decl 7882 && (TREE_CODE (b->decl) == VAR_DECL 7883 || TREE_CODE (b->decl) == PARM_DECL) 7884 && b->depth >= cur_block->the_scope->depth) 7885 b = b->shadowed; 7886 7887 /* Is the next declaration not in enclosing block? */ 7888 if (b && b->decl 7889 && (TREE_CODE (b->decl) == VAR_DECL 7890 || TREE_CODE (b->decl) == PARM_DECL) 7891 && b->depth < cb->the_scope->depth) { 7892 /* No declaration of variable seen in the block. Must insert one, 7893 so it 'freezes' the variable in this block. */ 7894 struct c_scope *save_scope = current_scope; 7895 struct block_sema_info *save_current_block = cur_block; 7896 current_scope = cb->the_scope; 7897 cur_block = cb; 7898 decl = build_block_ref_decl (name, decl); 7899 cur_block = save_current_block; 7900 current_scope = save_scope; 7901 } 7902 cb = cb->prev_block_info; 7903 } 7904 } 7905 /* APPLE LOCAL end radar 5988451 (C++ ch) */ 7906 } 7907 /* APPLE LOCAL end radar 5932809 - copyable byref blocks (C++ ch) */ 7908 /* APPLE LOCAL begin radar 6212722 */ 7909 exp = decl; 7910 type = TREE_TYPE (exp); 7911 if (TREE_CODE (type) == ARRAY_TYPE) { 7912 exp = array_to_pointer_conversion (decl); 7913 type = TREE_TYPE (exp); 7914 } 7915 else if (TREE_CODE (type) == FUNCTION_TYPE) { 7916 exp = function_to_pointer_conversion (exp); 7917 type = TREE_TYPE (exp); 7918 } 7919 ref_decl = build_decl (VAR_DECL, name, 7920 build_qualified_type (type, TYPE_QUAL_CONST)); 7921 /* APPLE LOCAL end radar 6212722 */ 7922 /* APPLE LOCAL begin radars 6144664 & 6145471 */ 7923 DECL_SOURCE_LOCATION (ref_decl) = DECL_SOURCE_LOCATION 7924 (cur_block->helper_func_decl); 7925 /* APPLE LOCAL end radars 6144664 & 6145471 */ 7926 DECL_INITIAL (ref_decl) = error_mark_node; 7927 /* APPLE LOCAL radar 5805175 - blocks (C++ ch) */ 7928 c_apply_type_quals_to_decl (TYPE_QUAL_CONST, ref_decl); 7929 BLOCK_DECL_COPIED (ref_decl) = 1; 7930 7931 /* Find the scope for function body (outer-most scope) and insert 7932 this variable in that scope. This is to avoid duplicate 7933 declaration of the save variable. */ 7934 while (scope && !scope->function_body) 7935 scope = scope->outer; 7936 /* We are enterring the copied-in variable in helper function's 7937 outer scope; that of its main body. */ 7938 gcc_assert (scope); 7939 bind (name, ref_decl, 7940 scope, /*invisible=*/false, /*nested=*/false); 7941 cur_block->block_ref_decl_list = 7942 tree_cons (NULL_TREE, ref_decl, cur_block->block_ref_decl_list); 7943 cur_block->block_original_ref_decl_list = 7944 /* APPLE LOCAL radar 6212722 */ 7945 tree_cons (NULL_TREE, exp, cur_block->block_original_ref_decl_list); 7946 return ref_decl; 7947} 7948 7949/* APPLE LOCAL begin radar 5847213 - radar 6329245 */ 7950static GTY (()) tree descriptor_ptr_type; 7951static GTY (()) tree descriptor_ptr_type_with_copydispose; 7952/** build_block_descriptor_type - This routine builds following internal type: 7953 struct __block_descriptor { 7954 unsigned long int reserved; // NULL 7955 unsigned long int Size; // sizeof(struct Block_literal_1) 7956 7957 // optional helper functions 7958 void *CopyFuncPtr; // When BLOCK_HAS_COPY_DISPOSE is set (withCopyDispose true) 7959 void *DestroyFuncPtr; // When BLOCK_HAS_COPY_DISPOSE is set (withCopyDispose true) 7960} *descriptor_ptr_type; 7961 7962Objects of this type will always be static. This is one main component of abi change. 7963*/ 7964tree 7965build_block_descriptor_type (bool withCopyDispose) 7966{ 7967 tree field_decl_chain, field_decl; 7968 tree main_type; 7969 7970 if (withCopyDispose && descriptor_ptr_type_with_copydispose) 7971 return descriptor_ptr_type_with_copydispose; 7972 if (!withCopyDispose && descriptor_ptr_type) 7973 return descriptor_ptr_type; 7974 7975 main_type = 7976 withCopyDispose ? 7977 start_struct (RECORD_TYPE, get_identifier ("__block_descriptor_withcopydispose")) 7978 : start_struct (RECORD_TYPE, get_identifier ("__block_descriptor")); 7979 7980 /* unsigned long int reserved; */ 7981 field_decl = build_decl (FIELD_DECL, get_identifier ("reserved"), long_unsigned_type_node); 7982 field_decl_chain = field_decl; 7983 7984 /* unsigned long int Size; */ 7985 field_decl = build_decl (FIELD_DECL, get_identifier ("Size"), long_unsigned_type_node); 7986 chainon (field_decl_chain, field_decl); 7987 7988 if (withCopyDispose) 7989 { 7990 /* void *CopyFuncPtr; */ 7991 field_decl = build_decl (FIELD_DECL, get_identifier ("CopyFuncPtr"), ptr_type_node); 7992 chainon (field_decl_chain, field_decl); 7993 /* void *DestroyFuncPtr; */ 7994 field_decl = build_decl (FIELD_DECL, get_identifier ("DestroyFuncPtr"), ptr_type_node); 7995 chainon (field_decl_chain, field_decl); 7996 } 7997 7998 /* Mark this struct as being a block struct rather than a 'normal' 7999 struct. */ 8000 TYPE_BLOCK_IMPL_STRUCT (main_type) = 1; 8001 finish_struct (main_type, field_decl_chain, NULL_TREE); 8002 8003 main_type = build_pointer_type (main_type); 8004 if (withCopyDispose) 8005 descriptor_ptr_type_with_copydispose = main_type; 8006 else 8007 descriptor_ptr_type = main_type; 8008 return main_type; 8009} 8010/* APPLE LOCAL end radar 5847213 - radar 6329245 */ 8011 8012/* APPLE LOCAL begin radar 5814025 (C++ ch) */ 8013struct c_declarator * 8014make_block_pointer_declarator (struct c_declspecs *type_quals_attrs, 8015 struct c_declarator *target) 8016{ 8017 int quals = 0; 8018 struct c_declarator *itarget = target; 8019 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator); 8020 8021 if (type_quals_attrs) 8022 { 8023 tree attrs = type_quals_attrs->attrs; 8024 quals = quals_from_declspecs (type_quals_attrs); 8025 if (attrs != NULL_TREE) 8026 itarget = build_attrs_declarator (attrs, target); 8027 } 8028 ret->kind = cdk_block_pointer; 8029 /* APPLE LOCAL radar 5882266 (C++ ch) */ 8030 ret->declarator = itarget; 8031 ret->u.pointer_quals = quals; 8032 return ret; 8033} 8034/* APPLE LOCAL end radar 5814025 (C++ ch) */ 8035 8036tree 8037begin_block (void) 8038{ 8039 struct block_sema_info *csi; 8040#if 0 8041 push_scope (); 8042#endif 8043 csi = (struct block_sema_info*)xcalloc (1, sizeof (struct block_sema_info)); 8044 csi->prev_block_info = cur_block; 8045 cur_block = csi; 8046 return NULL_TREE; 8047} 8048 8049struct block_sema_info * 8050finish_block (tree block __attribute__ ((__unused__))) 8051{ 8052 struct block_sema_info *csi = cur_block; 8053 cur_block = cur_block->prev_block_info; 8054#if 0 8055 pop_scope (); 8056#endif 8057 return csi; 8058} 8059 8060bool 8061in_imm_block (void) 8062{ 8063 /* APPLE LOCAL radar 5988451 (C++ ch) */ 8064 return (cur_block && cur_block->the_scope == current_scope); 8065} 8066 8067/* This routine returns 'true' if 'name' has a declaration inside the 8068 current block, 'false' otherwise. If 'name' has no declaration in 8069 the current block, it returns in DECL the user declaration for 8070 'name' found in the enclosing scope. Note that if it is declared 8071 in current declaration, it can be either a user declaration or a 8072 byref/copied-in declaration added in current block's scope by the 8073 compiler. */ 8074bool 8075lookup_name_in_block (tree name, tree *decl) 8076{ 8077 if (cur_block) 8078 { 8079 struct c_binding *b = I_SYMBOL_BINDING (name); 8080 if (b->depth >= cur_block->the_scope->depth) 8081 return true; 8082 8083 /* Check for common case of block nested inside a non-block. */ 8084 if (!cur_block->prev_block_info) 8085 return false; 8086 /* Check for less common case of nested blocks. */ 8087 /* Declaration not in current block. Find the first user 8088 declaration of 'name' in outer scope. */ 8089 /* APPLE LOCAL begin radar 5988451 (C++ ch) */ 8090 /* Check for variables only, as we may have parameters, such as 8091 'self' */ 8092 /* Note that if a copied-in variable (BLOCK_DECL_COPIED) in the 8093 enclosing block is found, it must be returned as this is 8094 where the variable in current (nested block) will have to get 8095 its value. */ 8096 while (b && b->decl 8097 && (TREE_CODE (b->decl) == VAR_DECL) 8098 && BLOCK_DECL_BYREF (b->decl)) 8099 b = b->shadowed; 8100 /* APPLE LOCAL end radar 5988451 (C++ ch) */ 8101 if (b && b->decl) 8102 *decl = b->decl; 8103 } 8104 return false; 8105} 8106 8107static struct c_scope *save_current_scope; 8108static tree save_current_function_decl; 8109void 8110push_to_top_level (void) 8111{ 8112 save_current_scope = current_scope; 8113 save_current_function_decl = current_function_decl; 8114 current_scope = file_scope; 8115 current_function_decl = NULL_TREE; 8116} 8117 8118void 8119pop_from_top_level (void) 8120{ 8121 current_scope = save_current_scope; 8122 current_function_decl = save_current_function_decl; 8123} 8124 8125/** 8126 build_helper_func_decl - This routine builds a FUNCTION_DECL for 8127 a block helper function. 8128*/ 8129tree 8130build_helper_func_decl (tree ident, tree type) 8131{ 8132 tree func_decl = build_decl (FUNCTION_DECL, ident, type); 8133 DECL_EXTERNAL (func_decl) = 0; 8134 TREE_PUBLIC (func_decl) = 0; 8135 TREE_USED (func_decl) = 1; 8136 TREE_NOTHROW (func_decl) = 0; 8137 /* APPLE LOCAL radar 6172148 */ 8138 BLOCK_SYNTHESIZED_FUNC (func_decl) = 1; 8139 return func_decl; 8140} 8141 8142/** 8143 start_block_helper_function - This is a light-weight version of start_function(). 8144 It has removed all the fuss in the start_function(). 8145 */ 8146void 8147start_block_helper_function (tree decl1) 8148{ 8149 struct c_label_context_se *nstack_se; 8150 struct c_label_context_vm *nstack_vm; 8151 tree restype, resdecl; 8152 8153 current_function_returns_value = 0; /* Assume, until we see it does. */ 8154 current_function_returns_null = 0; 8155 current_function_returns_abnormally = 0; 8156 warn_about_return_type = 0; 8157 c_switch_stack = NULL; 8158 8159 nstack_se = XOBNEW (&parser_obstack, struct c_label_context_se); 8160 nstack_se->labels_def = NULL; 8161 nstack_se->labels_used = NULL; 8162 nstack_se->next = label_context_stack_se; 8163 label_context_stack_se = nstack_se; 8164 8165 nstack_vm = XOBNEW (&parser_obstack, struct c_label_context_vm); 8166 nstack_vm->labels_def = NULL; 8167 nstack_vm->labels_used = NULL; 8168 nstack_vm->scope = 0; 8169 nstack_vm->next = label_context_stack_vm; 8170 label_context_stack_vm = nstack_vm; 8171 8172 /* Indicate no valid break/continue context by setting these variables 8173 to some non-null, non-label value. We'll notice and emit the proper 8174 error message in c_finish_bc_stmt. */ 8175 c_break_label = c_cont_label = size_zero_node; 8176 8177 announce_function (decl1); 8178 8179 /* Make the init_value nonzero so pushdecl knows this is not tentative. 8180 error_mark_node is replaced below (in pop_scope) with the BLOCK. */ 8181 DECL_INITIAL (decl1) = error_mark_node; 8182 8183 current_function_prototype_locus = UNKNOWN_LOCATION; 8184 current_function_prototype_built_in = false; 8185 current_function_prototype_arg_types = NULL_TREE; 8186 8187 /* This function exists in static storage. 8188 (This does not mean `static' in the C sense!) */ 8189 TREE_STATIC (decl1) = 1; 8190 /* A helper function is not global */ 8191 TREE_PUBLIC (decl1) = 0; 8192 8193 /* This is the earliest point at which we might know the assembler 8194 name of the function. Thus, if it's set before this, die horribly. */ 8195 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1)); 8196 current_function_decl = pushdecl (decl1); 8197 8198 push_scope (); 8199 declare_parm_level (); 8200 8201 restype = TREE_TYPE (TREE_TYPE (current_function_decl)); 8202 resdecl = build_decl (RESULT_DECL, NULL_TREE, restype); 8203 DECL_ARTIFICIAL (resdecl) = 1; 8204 DECL_IGNORED_P (resdecl) = 1; 8205 DECL_RESULT (current_function_decl) = resdecl; 8206 8207 start_fname_decls (); 8208} 8209 8210/** 8211 declare_block_prologue_local_vars - utility routine to do the actual 8212 declaration and initialization for each referecned block variable. 8213*/ 8214static void 8215declare_block_prologue_local_vars (tree self_parm, tree component, 8216 tree stmt) 8217{ 8218 tree decl, block_component; 8219 tree_stmt_iterator i; 8220 tree decl_stmt; 8221 8222 decl = component; 8223 block_component = build_component_ref (build_indirect_ref (self_parm, "->"), 8224 DECL_NAME (component)); 8225 gcc_assert (block_component); 8226 DECL_EXTERNAL (decl) = 0; 8227 TREE_STATIC (decl) = 0; 8228 TREE_USED (decl) = 1; 8229 DECL_CONTEXT (decl) = current_function_decl; 8230 DECL_ARTIFICIAL (decl) = 1; 8231 DECL_INITIAL (decl) = block_component; 8232 /* Prepend a DECL_EXPR statement to the statement list. */ 8233 i = tsi_start (stmt); 8234 decl_stmt = build_stmt (DECL_EXPR, decl); 8235 /* APPLE LOCAL Radar 5811961, Fix location of block prologue vars (C++ ch) */ 8236 SET_EXPR_LOCATION (decl_stmt, DECL_SOURCE_LOCATION (decl)); 8237 /* APPLE LOCAL begin radar 6163705, Blocks prologues */ 8238 /* Give the prologue statements a line number of one before the beginning of 8239 the function, to make them easily identifiable later. */ 8240 EXPR_LINENO (decl_stmt) = DECL_SOURCE_LINE (decl) - 1; 8241 /* APPLE LOCAL end radar 6163705, Blocks prologues */ 8242 tsi_link_before (&i, decl_stmt, TSI_SAME_STMT); 8243} 8244 8245/** 8246 block_build_prologue 8247 - This routine builds the declarations for the 8248 variables referenced in the block; as in: 8249 int *y = .block_descriptor->y; 8250 int x = .block_descriptor->x; 8251 8252 The decl_expr declaration for each initialization is enterred at the 8253 beginning of the helper function's statement-list which is passed 8254 in block_impl->block_body. 8255*/ 8256void 8257block_build_prologue (struct block_sema_info *block_impl) 8258{ 8259 tree chain; 8260 /* APPLE LOCAL radar 6404979 */ 8261 tree self_parm = lookup_name (get_identifier (".block_descriptor")); 8262 gcc_assert (self_parm); 8263 8264 for (chain = block_impl->block_ref_decl_list; chain; 8265 chain = TREE_CHAIN (chain)) 8266 declare_block_prologue_local_vars (self_parm, TREE_VALUE (chain), 8267 block_impl->block_body); 8268 8269 for (chain = block_impl->block_byref_decl_list; chain; 8270 chain = TREE_CHAIN (chain)) 8271 declare_block_prologue_local_vars (self_parm, TREE_VALUE (chain), 8272 block_impl->block_body); 8273} 8274/* APPLE LOCAL end radar 5732232 - blocks (C++ ch) */ 8275 8276/* Return a pointer to a structure for an empty list of declaration 8277 specifiers. */ 8278 8279struct c_declspecs * 8280build_null_declspecs (void) 8281{ 8282 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs); 8283 ret->type = 0; 8284 ret->decl_attr = 0; 8285 ret->attrs = 0; 8286 ret->typespec_word = cts_none; 8287 ret->storage_class = csc_none; 8288 ret->declspecs_seen_p = false; 8289 ret->type_seen_p = false; 8290 ret->non_sc_seen_p = false; 8291 ret->typedef_p = false; 8292 ret->tag_defined_p = false; 8293 ret->explicit_signed_p = false; 8294 ret->deprecated_p = false; 8295 /* APPLE LOCAL "unavailable" attribute (radar 2809697) */ 8296 ret->unavailable_p = false; 8297 ret->default_int_p = false; 8298 ret->long_p = false; 8299 ret->long_long_p = false; 8300 ret->short_p = false; 8301 ret->signed_p = false; 8302 ret->unsigned_p = false; 8303 ret->complex_p = false; 8304 ret->inline_p = false; 8305 ret->thread_p = false; 8306 ret->const_p = false; 8307 ret->volatile_p = false; 8308 ret->restrict_p = false; 8309 return ret; 8310} 8311 8312/* Add the type qualifier QUAL to the declaration specifiers SPECS, 8313 returning SPECS. */ 8314 8315struct c_declspecs * 8316declspecs_add_qual (struct c_declspecs *specs, tree qual) 8317{ 8318 enum rid i; 8319 bool dupe = false; 8320 specs->non_sc_seen_p = true; 8321 specs->declspecs_seen_p = true; 8322 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE 8323 && C_IS_RESERVED_WORD (qual)); 8324 i = C_RID_CODE (qual); 8325 switch (i) 8326 { 8327 case RID_CONST: 8328 dupe = specs->const_p; 8329 specs->const_p = true; 8330 break; 8331 case RID_VOLATILE: 8332 dupe = specs->volatile_p; 8333 specs->volatile_p = true; 8334 break; 8335 case RID_RESTRICT: 8336 dupe = specs->restrict_p; 8337 specs->restrict_p = true; 8338 break; 8339 default: 8340 gcc_unreachable (); 8341 } 8342 if (dupe && pedantic && !flag_isoc99) 8343 pedwarn ("duplicate %qE", qual); 8344 return specs; 8345} 8346 8347/* Add the type specifier TYPE to the declaration specifiers SPECS, 8348 returning SPECS. */ 8349 8350struct c_declspecs * 8351declspecs_add_type (struct c_declspecs *specs, struct c_typespec spec) 8352{ 8353 tree type = spec.spec; 8354 specs->non_sc_seen_p = true; 8355 specs->declspecs_seen_p = true; 8356 specs->type_seen_p = true; 8357 if (TREE_DEPRECATED (type)) 8358 specs->deprecated_p = true; 8359 8360 /* APPLE LOCAL begin "unavailable" attribute (radar 2809697) */ 8361 if (TREE_UNAVAILABLE (type)) 8362 specs->unavailable_p = true; 8363 /* APPLE LOCAL end "unavailable" attribute (radar 2809697) */ 8364 8365 /* Handle type specifier keywords. */ 8366 if (TREE_CODE (type) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (type)) 8367 { 8368 enum rid i = C_RID_CODE (type); 8369 if (specs->type) 8370 { 8371 error ("two or more data types in declaration specifiers"); 8372 return specs; 8373 } 8374 if ((int) i <= (int) RID_LAST_MODIFIER) 8375 { 8376 /* "long", "short", "signed", "unsigned" or "_Complex". */ 8377 bool dupe = false; 8378 switch (i) 8379 { 8380 case RID_LONG: 8381 if (specs->long_long_p) 8382 { 8383 error ("%<long long long%> is too long for GCC"); 8384 break; 8385 } 8386 if (specs->long_p) 8387 { 8388 if (specs->typespec_word == cts_double) 8389 { 8390 error ("both %<long long%> and %<double%> in " 8391 "declaration specifiers"); 8392 break; 8393 } 8394 if (pedantic && !flag_isoc99 && !in_system_header 8395 && warn_long_long) 8396 pedwarn ("ISO C90 does not support %<long long%>"); 8397 specs->long_long_p = 1; 8398 break; 8399 } 8400 if (specs->short_p) 8401 error ("both %<long%> and %<short%> in " 8402 "declaration specifiers"); 8403 else if (specs->typespec_word == cts_void) 8404 error ("both %<long%> and %<void%> in " 8405 "declaration specifiers"); 8406 else if (specs->typespec_word == cts_bool) 8407 error ("both %<long%> and %<_Bool%> in " 8408 "declaration specifiers"); 8409 else if (specs->typespec_word == cts_char) 8410 error ("both %<long%> and %<char%> in " 8411 "declaration specifiers"); 8412 else if (specs->typespec_word == cts_float) 8413 error ("both %<long%> and %<float%> in " 8414 "declaration specifiers"); 8415 else if (specs->typespec_word == cts_dfloat32) 8416 error ("both %<long%> and %<_Decimal32%> in " 8417 "declaration specifiers"); 8418 else if (specs->typespec_word == cts_dfloat64) 8419 error ("both %<long%> and %<_Decimal64%> in " 8420 "declaration specifiers"); 8421 else if (specs->typespec_word == cts_dfloat128) 8422 error ("both %<long%> and %<_Decimal128%> in " 8423 "declaration specifiers"); 8424 else 8425 specs->long_p = true; 8426 break; 8427 case RID_SHORT: 8428 dupe = specs->short_p; 8429 if (specs->long_p) 8430 error ("both %<long%> and %<short%> in " 8431 "declaration specifiers"); 8432 else if (specs->typespec_word == cts_void) 8433 error ("both %<short%> and %<void%> in " 8434 "declaration specifiers"); 8435 else if (specs->typespec_word == cts_bool) 8436 error ("both %<short%> and %<_Bool%> in " 8437 "declaration specifiers"); 8438 else if (specs->typespec_word == cts_char) 8439 error ("both %<short%> and %<char%> in " 8440 "declaration specifiers"); 8441 else if (specs->typespec_word == cts_float) 8442 error ("both %<short%> and %<float%> in " 8443 "declaration specifiers"); 8444 else if (specs->typespec_word == cts_double) 8445 error ("both %<short%> and %<double%> in " 8446 "declaration specifiers"); 8447 else if (specs->typespec_word == cts_dfloat32) 8448 error ("both %<short%> and %<_Decimal32%> in " 8449 "declaration specifiers"); 8450 else if (specs->typespec_word == cts_dfloat64) 8451 error ("both %<short%> and %<_Decimal64%> in " 8452 "declaration specifiers"); 8453 else if (specs->typespec_word == cts_dfloat128) 8454 error ("both %<short%> and %<_Decimal128%> in " 8455 "declaration specifiers"); 8456 else 8457 specs->short_p = true; 8458 break; 8459 case RID_SIGNED: 8460 dupe = specs->signed_p; 8461 if (specs->unsigned_p) 8462 error ("both %<signed%> and %<unsigned%> in " 8463 "declaration specifiers"); 8464 else if (specs->typespec_word == cts_void) 8465 error ("both %<signed%> and %<void%> in " 8466 "declaration specifiers"); 8467 else if (specs->typespec_word == cts_bool) 8468 error ("both %<signed%> and %<_Bool%> in " 8469 "declaration specifiers"); 8470 else if (specs->typespec_word == cts_float) 8471 error ("both %<signed%> and %<float%> in " 8472 "declaration specifiers"); 8473 else if (specs->typespec_word == cts_double) 8474 error ("both %<signed%> and %<double%> in " 8475 "declaration specifiers"); 8476 else if (specs->typespec_word == cts_dfloat32) 8477 error ("both %<signed%> and %<_Decimal32%> in " 8478 "declaration specifiers"); 8479 else if (specs->typespec_word == cts_dfloat64) 8480 error ("both %<signed%> and %<_Decimal64%> in " 8481 "declaration specifiers"); 8482 else if (specs->typespec_word == cts_dfloat128) 8483 error ("both %<signed%> and %<_Decimal128%> in " 8484 "declaration specifiers"); 8485 else 8486 specs->signed_p = true; 8487 break; 8488 case RID_UNSIGNED: 8489 dupe = specs->unsigned_p; 8490 if (specs->signed_p) 8491 error ("both %<signed%> and %<unsigned%> in " 8492 "declaration specifiers"); 8493 else if (specs->typespec_word == cts_void) 8494 error ("both %<unsigned%> and %<void%> in " 8495 "declaration specifiers"); 8496 else if (specs->typespec_word == cts_bool) 8497 error ("both %<unsigned%> and %<_Bool%> in " 8498 "declaration specifiers"); 8499 else if (specs->typespec_word == cts_float) 8500 error ("both %<unsigned%> and %<float%> in " 8501 "declaration specifiers"); 8502 else if (specs->typespec_word == cts_double) 8503 error ("both %<unsigned%> and %<double%> in " 8504 "declaration specifiers"); 8505 else if (specs->typespec_word == cts_dfloat32) 8506 error ("both %<unsigned%> and %<_Decimal32%> in " 8507 "declaration specifiers"); 8508 else if (specs->typespec_word == cts_dfloat64) 8509 error ("both %<unsigned%> and %<_Decimal64%> in " 8510 "declaration specifiers"); 8511 else if (specs->typespec_word == cts_dfloat128) 8512 error ("both %<unsigned%> and %<_Decimal128%> in " 8513 "declaration specifiers"); 8514 else 8515 specs->unsigned_p = true; 8516 break; 8517 case RID_COMPLEX: 8518 dupe = specs->complex_p; 8519 if (pedantic && !flag_isoc99 && !in_system_header) 8520 pedwarn ("ISO C90 does not support complex types"); 8521 if (specs->typespec_word == cts_void) 8522 error ("both %<complex%> and %<void%> in " 8523 "declaration specifiers"); 8524 else if (specs->typespec_word == cts_bool) 8525 error ("both %<complex%> and %<_Bool%> in " 8526 "declaration specifiers"); 8527 else if (specs->typespec_word == cts_dfloat32) 8528 error ("both %<complex%> and %<_Decimal32%> in " 8529 "declaration specifiers"); 8530 else if (specs->typespec_word == cts_dfloat64) 8531 error ("both %<complex%> and %<_Decimal64%> in " 8532 "declaration specifiers"); 8533 else if (specs->typespec_word == cts_dfloat128) 8534 error ("both %<complex%> and %<_Decimal128%> in " 8535 "declaration specifiers"); 8536 else 8537 specs->complex_p = true; 8538 break; 8539 default: 8540 gcc_unreachable (); 8541 } 8542 8543 if (dupe) 8544 error ("duplicate %qE", type); 8545 8546 return specs; 8547 } 8548 else 8549 { 8550 /* "void", "_Bool", "char", "int", "float" or "double". */ 8551 if (specs->typespec_word != cts_none) 8552 { 8553 error ("two or more data types in declaration specifiers"); 8554 return specs; 8555 } 8556 switch (i) 8557 { 8558 case RID_VOID: 8559 if (specs->long_p) 8560 error ("both %<long%> and %<void%> in " 8561 "declaration specifiers"); 8562 else if (specs->short_p) 8563 error ("both %<short%> and %<void%> in " 8564 "declaration specifiers"); 8565 else if (specs->signed_p) 8566 error ("both %<signed%> and %<void%> in " 8567 "declaration specifiers"); 8568 else if (specs->unsigned_p) 8569 error ("both %<unsigned%> and %<void%> in " 8570 "declaration specifiers"); 8571 else if (specs->complex_p) 8572 error ("both %<complex%> and %<void%> in " 8573 "declaration specifiers"); 8574 else 8575 specs->typespec_word = cts_void; 8576 return specs; 8577 case RID_BOOL: 8578 if (specs->long_p) 8579 error ("both %<long%> and %<_Bool%> in " 8580 "declaration specifiers"); 8581 else if (specs->short_p) 8582 error ("both %<short%> and %<_Bool%> in " 8583 "declaration specifiers"); 8584 else if (specs->signed_p) 8585 error ("both %<signed%> and %<_Bool%> in " 8586 "declaration specifiers"); 8587 else if (specs->unsigned_p) 8588 error ("both %<unsigned%> and %<_Bool%> in " 8589 "declaration specifiers"); 8590 else if (specs->complex_p) 8591 error ("both %<complex%> and %<_Bool%> in " 8592 "declaration specifiers"); 8593 else 8594 specs->typespec_word = cts_bool; 8595 return specs; 8596 case RID_CHAR: 8597 if (specs->long_p) 8598 error ("both %<long%> and %<char%> in " 8599 "declaration specifiers"); 8600 else if (specs->short_p) 8601 error ("both %<short%> and %<char%> in " 8602 "declaration specifiers"); 8603 else 8604 specs->typespec_word = cts_char; 8605 return specs; 8606 case RID_INT: 8607 specs->typespec_word = cts_int; 8608 return specs; 8609 case RID_FLOAT: 8610 if (specs->long_p) 8611 error ("both %<long%> and %<float%> in " 8612 "declaration specifiers"); 8613 else if (specs->short_p) 8614 error ("both %<short%> and %<float%> in " 8615 "declaration specifiers"); 8616 else if (specs->signed_p) 8617 error ("both %<signed%> and %<float%> in " 8618 "declaration specifiers"); 8619 else if (specs->unsigned_p) 8620 error ("both %<unsigned%> and %<float%> in " 8621 "declaration specifiers"); 8622 else 8623 specs->typespec_word = cts_float; 8624 return specs; 8625 case RID_DOUBLE: 8626 if (specs->long_long_p) 8627 error ("both %<long long%> and %<double%> in " 8628 "declaration specifiers"); 8629 else if (specs->short_p) 8630 error ("both %<short%> and %<double%> in " 8631 "declaration specifiers"); 8632 else if (specs->signed_p) 8633 error ("both %<signed%> and %<double%> in " 8634 "declaration specifiers"); 8635 else if (specs->unsigned_p) 8636 error ("both %<unsigned%> and %<double%> in " 8637 "declaration specifiers"); 8638 else 8639 specs->typespec_word = cts_double; 8640 return specs; 8641 case RID_DFLOAT32: 8642 case RID_DFLOAT64: 8643 case RID_DFLOAT128: 8644 { 8645 const char *str; 8646 if (i == RID_DFLOAT32) 8647 str = "_Decimal32"; 8648 else if (i == RID_DFLOAT64) 8649 str = "_Decimal64"; 8650 else 8651 str = "_Decimal128"; 8652 if (specs->long_long_p) 8653 error ("both %<long long%> and %<%s%> in " 8654 "declaration specifiers", str); 8655 if (specs->long_p) 8656 error ("both %<long%> and %<%s%> in " 8657 "declaration specifiers", str); 8658 else if (specs->short_p) 8659 error ("both %<short%> and %<%s%> in " 8660 "declaration specifiers", str); 8661 else if (specs->signed_p) 8662 error ("both %<signed%> and %<%s%> in " 8663 "declaration specifiers", str); 8664 else if (specs->unsigned_p) 8665 error ("both %<unsigned%> and %<%s%> in " 8666 "declaration specifiers", str); 8667 else if (specs->complex_p) 8668 error ("both %<complex%> and %<%s%> in " 8669 "declaration specifiers", str); 8670 else if (i == RID_DFLOAT32) 8671 specs->typespec_word = cts_dfloat32; 8672 else if (i == RID_DFLOAT64) 8673 specs->typespec_word = cts_dfloat64; 8674 else 8675 specs->typespec_word = cts_dfloat128; 8676 } 8677 if (!targetm.decimal_float_supported_p ()) 8678 error ("decimal floating point not supported for this target"); 8679 if (pedantic) 8680 pedwarn ("ISO C does not support decimal floating point"); 8681 return specs; 8682 default: 8683 /* ObjC reserved word "id", handled below. */ 8684 break; 8685 } 8686 } 8687 } 8688 8689 /* Now we have a typedef (a TYPE_DECL node), an identifier (some 8690 form of ObjC type, cases such as "int" and "long" being handled 8691 above), a TYPE (struct, union, enum and typeof specifiers) or an 8692 ERROR_MARK. In none of these cases may there have previously 8693 been any type specifiers. */ 8694 if (specs->type || specs->typespec_word != cts_none 8695 || specs->long_p || specs->short_p || specs->signed_p 8696 || specs->unsigned_p || specs->complex_p) 8697 error ("two or more data types in declaration specifiers"); 8698 else if (TREE_CODE (type) == TYPE_DECL) 8699 { 8700 if (TREE_TYPE (type) == error_mark_node) 8701 ; /* Allow the type to default to int to avoid cascading errors. */ 8702 else 8703 { 8704 specs->type = TREE_TYPE (type); 8705 specs->decl_attr = DECL_ATTRIBUTES (type); 8706 specs->typedef_p = true; 8707 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type); 8708 } 8709 } 8710 else if (TREE_CODE (type) == IDENTIFIER_NODE) 8711 { 8712 tree t = lookup_name (type); 8713 if (!t || TREE_CODE (t) != TYPE_DECL) 8714 error ("%qE fails to be a typedef or built in type", type); 8715 else if (TREE_TYPE (t) == error_mark_node) 8716 ; 8717 else 8718 specs->type = TREE_TYPE (t); 8719 } 8720 else if (TREE_CODE (type) != ERROR_MARK) 8721 { 8722 if (spec.kind == ctsk_tagdef || spec.kind == ctsk_tagfirstref) 8723 specs->tag_defined_p = true; 8724 if (spec.kind == ctsk_typeof) 8725 specs->typedef_p = true; 8726 specs->type = type; 8727 } 8728 8729 return specs; 8730} 8731 8732/* Add the storage class specifier or function specifier SCSPEC to the 8733 declaration specifiers SPECS, returning SPECS. */ 8734 8735struct c_declspecs * 8736declspecs_add_scspec (struct c_declspecs *specs, tree scspec) 8737{ 8738 enum rid i; 8739 enum c_storage_class n = csc_none; 8740 bool dupe = false; 8741 specs->declspecs_seen_p = true; 8742 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE 8743 && C_IS_RESERVED_WORD (scspec)); 8744 i = C_RID_CODE (scspec); 8745 if (extra_warnings && specs->non_sc_seen_p) 8746 warning (OPT_Wextra, "%qE is not at beginning of declaration", scspec); 8747 switch (i) 8748 { 8749 case RID_INLINE: 8750 /* C99 permits duplicate inline. Although of doubtful utility, 8751 it seems simplest to permit it in gnu89 mode as well, as 8752 there is also little utility in maintaining this as a 8753 difference between gnu89 and C99 inline. */ 8754 dupe = false; 8755 specs->inline_p = true; 8756 break; 8757 case RID_THREAD: 8758 dupe = specs->thread_p; 8759 if (specs->storage_class == csc_auto) 8760 error ("%<__thread%> used with %<auto%>"); 8761 else if (specs->storage_class == csc_register) 8762 error ("%<__thread%> used with %<register%>"); 8763 else if (specs->storage_class == csc_typedef) 8764 error ("%<__thread%> used with %<typedef%>"); 8765 else 8766 specs->thread_p = true; 8767 break; 8768 case RID_AUTO: 8769 n = csc_auto; 8770 break; 8771 case RID_EXTERN: 8772 n = csc_extern; 8773 /* Diagnose "__thread extern". */ 8774 if (specs->thread_p) 8775 error ("%<__thread%> before %<extern%>"); 8776 break; 8777 case RID_REGISTER: 8778 n = csc_register; 8779 break; 8780 case RID_STATIC: 8781 n = csc_static; 8782 /* Diagnose "__thread static". */ 8783 if (specs->thread_p) 8784 error ("%<__thread%> before %<static%>"); 8785 break; 8786 case RID_TYPEDEF: 8787 n = csc_typedef; 8788 break; 8789 default: 8790 gcc_unreachable (); 8791 } 8792 if (n != csc_none && n == specs->storage_class) 8793 dupe = true; 8794 if (dupe) 8795 error ("duplicate %qE", scspec); 8796 if (n != csc_none) 8797 { 8798 if (specs->storage_class != csc_none && n != specs->storage_class) 8799 { 8800 error ("multiple storage classes in declaration specifiers"); 8801 } 8802 else 8803 { 8804 specs->storage_class = n; 8805 if (n != csc_extern && n != csc_static && specs->thread_p) 8806 { 8807 error ("%<__thread%> used with %qE", scspec); 8808 specs->thread_p = false; 8809 } 8810 } 8811 } 8812 return specs; 8813} 8814 8815/* Add the attributes ATTRS to the declaration specifiers SPECS, 8816 returning SPECS. */ 8817 8818struct c_declspecs * 8819declspecs_add_attrs (struct c_declspecs *specs, tree attrs) 8820{ 8821 specs->attrs = chainon (attrs, specs->attrs); 8822 specs->declspecs_seen_p = true; 8823 return specs; 8824} 8825 8826/* Combine "long", "short", "signed", "unsigned" and "_Complex" type 8827 specifiers with any other type specifier to determine the resulting 8828 type. This is where ISO C checks on complex types are made, since 8829 "_Complex long" is a prefix of the valid ISO C type "_Complex long 8830 double". */ 8831 8832struct c_declspecs * 8833finish_declspecs (struct c_declspecs *specs) 8834{ 8835 /* If a type was specified as a whole, we have no modifiers and are 8836 done. */ 8837 if (specs->type != NULL_TREE) 8838 { 8839 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p 8840 && !specs->signed_p && !specs->unsigned_p 8841 && !specs->complex_p); 8842 return specs; 8843 } 8844 8845 /* If none of "void", "_Bool", "char", "int", "float" or "double" 8846 has been specified, treat it as "int" unless "_Complex" is 8847 present and there are no other specifiers. If we just have 8848 "_Complex", it is equivalent to "_Complex double", but e.g. 8849 "_Complex short" is equivalent to "_Complex short int". */ 8850 if (specs->typespec_word == cts_none) 8851 { 8852 if (specs->long_p || specs->short_p 8853 || specs->signed_p || specs->unsigned_p) 8854 { 8855 specs->typespec_word = cts_int; 8856 } 8857 else if (specs->complex_p) 8858 { 8859 specs->typespec_word = cts_double; 8860 if (pedantic) 8861 pedwarn ("ISO C does not support plain %<complex%> meaning " 8862 "%<double complex%>"); 8863 } 8864 else 8865 { 8866 specs->typespec_word = cts_int; 8867 specs->default_int_p = true; 8868 /* We don't diagnose this here because grokdeclarator will 8869 give more specific diagnostics according to whether it is 8870 a function definition. */ 8871 } 8872 } 8873 8874 /* If "signed" was specified, record this to distinguish "int" and 8875 "signed int" in the case of a bit-field with 8876 -funsigned-bitfields. */ 8877 specs->explicit_signed_p = specs->signed_p; 8878 8879 /* Now compute the actual type. */ 8880 switch (specs->typespec_word) 8881 { 8882 case cts_void: 8883 gcc_assert (!specs->long_p && !specs->short_p 8884 && !specs->signed_p && !specs->unsigned_p 8885 && !specs->complex_p); 8886 specs->type = void_type_node; 8887 break; 8888 case cts_bool: 8889 gcc_assert (!specs->long_p && !specs->short_p 8890 && !specs->signed_p && !specs->unsigned_p 8891 && !specs->complex_p); 8892 specs->type = boolean_type_node; 8893 break; 8894 case cts_char: 8895 gcc_assert (!specs->long_p && !specs->short_p); 8896 gcc_assert (!(specs->signed_p && specs->unsigned_p)); 8897 if (specs->signed_p) 8898 specs->type = signed_char_type_node; 8899 else if (specs->unsigned_p) 8900 specs->type = unsigned_char_type_node; 8901 else 8902 specs->type = char_type_node; 8903 if (specs->complex_p) 8904 { 8905 if (pedantic) 8906 pedwarn ("ISO C does not support complex integer types"); 8907 specs->type = build_complex_type (specs->type); 8908 } 8909 break; 8910 case cts_int: 8911 gcc_assert (!(specs->long_p && specs->short_p)); 8912 gcc_assert (!(specs->signed_p && specs->unsigned_p)); 8913 if (specs->long_long_p) 8914 specs->type = (specs->unsigned_p 8915 ? long_long_unsigned_type_node 8916 : long_long_integer_type_node); 8917 else if (specs->long_p) 8918 specs->type = (specs->unsigned_p 8919 ? long_unsigned_type_node 8920 : long_integer_type_node); 8921 else if (specs->short_p) 8922 specs->type = (specs->unsigned_p 8923 ? short_unsigned_type_node 8924 : short_integer_type_node); 8925 else 8926 specs->type = (specs->unsigned_p 8927 ? unsigned_type_node 8928 : integer_type_node); 8929 if (specs->complex_p) 8930 { 8931 if (pedantic) 8932 pedwarn ("ISO C does not support complex integer types"); 8933 specs->type = build_complex_type (specs->type); 8934 } 8935 break; 8936 case cts_float: 8937 gcc_assert (!specs->long_p && !specs->short_p 8938 && !specs->signed_p && !specs->unsigned_p); 8939 specs->type = (specs->complex_p 8940 ? complex_float_type_node 8941 : float_type_node); 8942 break; 8943 case cts_double: 8944 gcc_assert (!specs->long_long_p && !specs->short_p 8945 && !specs->signed_p && !specs->unsigned_p); 8946 if (specs->long_p) 8947 { 8948 specs->type = (specs->complex_p 8949 ? complex_long_double_type_node 8950 : long_double_type_node); 8951 } 8952 else 8953 { 8954 specs->type = (specs->complex_p 8955 ? complex_double_type_node 8956 : double_type_node); 8957 } 8958 break; 8959 case cts_dfloat32: 8960 case cts_dfloat64: 8961 case cts_dfloat128: 8962 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p 8963 && !specs->signed_p && !specs->unsigned_p && !specs->complex_p); 8964 if (specs->typespec_word == cts_dfloat32) 8965 specs->type = dfloat32_type_node; 8966 else if (specs->typespec_word == cts_dfloat64) 8967 specs->type = dfloat64_type_node; 8968 else 8969 specs->type = dfloat128_type_node; 8970 break; 8971 default: 8972 gcc_unreachable (); 8973 } 8974 8975 return specs; 8976} 8977 8978/* Synthesize a function which calls all the global ctors or global 8979 dtors in this file. This is only used for targets which do not 8980 support .ctors/.dtors sections. FIXME: Migrate into cgraph. */ 8981static void 8982build_cdtor (int method_type, tree cdtors) 8983{ 8984 tree body = 0; 8985 8986 if (!cdtors) 8987 return; 8988 8989 for (; cdtors; cdtors = TREE_CHAIN (cdtors)) 8990 append_to_statement_list (build_function_call (TREE_VALUE (cdtors), 0), 8991 &body); 8992 8993 cgraph_build_static_cdtor (method_type, body, DEFAULT_INIT_PRIORITY); 8994} 8995 8996/* A subroutine of c_write_global_declarations. Perform final processing 8997 on one file scope's declarations (or the external scope's declarations), 8998 GLOBALS. */ 8999 9000static void 9001c_write_global_declarations_1 (tree globals) 9002{ 9003 tree decl; 9004 bool reconsider; 9005 9006 /* Process the decls in the order they were written. */ 9007 for (decl = globals; decl; decl = TREE_CHAIN (decl)) 9008 { 9009 /* Check for used but undefined static functions using the C 9010 standard's definition of "used", and set TREE_NO_WARNING so 9011 that check_global_declarations doesn't repeat the check. */ 9012 if (TREE_CODE (decl) == FUNCTION_DECL 9013 && DECL_INITIAL (decl) == 0 9014 && DECL_EXTERNAL (decl) 9015 && !TREE_PUBLIC (decl) 9016 && C_DECL_USED (decl)) 9017 { 9018 pedwarn ("%q+F used but never defined", decl); 9019 TREE_NO_WARNING (decl) = 1; 9020 } 9021 9022 wrapup_global_declaration_1 (decl); 9023 } 9024 9025 do 9026 { 9027 reconsider = false; 9028 for (decl = globals; decl; decl = TREE_CHAIN (decl)) 9029 reconsider |= wrapup_global_declaration_2 (decl); 9030 } 9031 while (reconsider); 9032 9033 for (decl = globals; decl; decl = TREE_CHAIN (decl)) 9034 check_global_declaration_1 (decl); 9035} 9036 9037/* A subroutine of c_write_global_declarations Emit debug information for each 9038 of the declarations in GLOBALS. */ 9039 9040static void 9041c_write_global_declarations_2 (tree globals) 9042{ 9043 tree decl; 9044 9045 for (decl = globals; decl ; decl = TREE_CHAIN (decl)) 9046 debug_hooks->global_decl (decl); 9047} 9048 9049/* Preserve the external declarations scope across a garbage collect. */ 9050static GTY(()) tree ext_block; 9051 9052void 9053c_write_global_declarations (void) 9054{ 9055 tree t; 9056 9057 /* We don't want to do this if generating a PCH. */ 9058 if (pch_file) 9059 return; 9060 9061 /* Don't waste time on further processing if -fsyntax-only or we've 9062 encountered errors. */ 9063 if (flag_syntax_only || errorcount || sorrycount || cpp_errors (parse_in)) 9064 return; 9065 9066 /* Close the external scope. */ 9067 ext_block = pop_scope (); 9068 external_scope = 0; 9069 gcc_assert (!current_scope); 9070 9071 if (ext_block) 9072 { 9073 tree tmp = BLOCK_VARS (ext_block); 9074 int flags; 9075 FILE * stream = dump_begin (TDI_tu, &flags); 9076 if (stream && tmp) 9077 { 9078 dump_node (tmp, flags & ~TDF_SLIM, stream); 9079 dump_end (TDI_tu, stream); 9080 } 9081 } 9082 9083 /* Process all file scopes in this compilation, and the external_scope, 9084 through wrapup_global_declarations and check_global_declarations. */ 9085 for (t = all_translation_units; t; t = TREE_CHAIN (t)) 9086 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t))); 9087 c_write_global_declarations_1 (BLOCK_VARS (ext_block)); 9088 9089 /* Generate functions to call static constructors and destructors 9090 for targets that do not support .ctors/.dtors sections. These 9091 functions have magic names which are detected by collect2. */ 9092 build_cdtor ('I', static_ctors); static_ctors = 0; 9093 build_cdtor ('D', static_dtors); static_dtors = 0; 9094 9095 /* We're done parsing; proceed to optimize and emit assembly. 9096 FIXME: shouldn't be the front end's responsibility to call this. */ 9097 cgraph_optimize (); 9098 9099 /* After cgraph has had a chance to emit everything that's going to 9100 be emitted, output debug information for globals. */ 9101 if (errorcount == 0 && sorrycount == 0) 9102 { 9103 timevar_push (TV_SYMOUT); 9104 for (t = all_translation_units; t; t = TREE_CHAIN (t)) 9105 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t))); 9106 c_write_global_declarations_2 (BLOCK_VARS (ext_block)); 9107 timevar_pop (TV_SYMOUT); 9108 } 9109 9110 ext_block = NULL; 9111} 9112 9113/* APPLE LOCAL begin radar 5741070 */ 9114 9115/* Given an IDENTIFIER tree for a class interface, find (if possible) and 9116 return the record type for the class interface. */ 9117 9118tree 9119c_return_interface_record_type (tree typename) 9120{ 9121 enum tree_code_class class; 9122 enum tree_code code; 9123 tree retval = NULL; 9124 9125 if (typename == NULL) 9126 return retval; 9127 9128 code = TREE_CODE (typename); 9129 class = TREE_CODE_CLASS (code); 9130 9131 if (code != IDENTIFIER_NODE 9132 || class != tcc_exceptional) 9133 return retval; 9134 9135 retval = I_TAG_DECL (typename); 9136 9137 if (TREE_CODE (retval) != RECORD_TYPE) 9138 retval = NULL; 9139 9140 return retval; 9141} 9142/* APPLE LOCAL end radar 5741070 */ 9143 9144#include "gt-c-decl.h" 9145