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 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
31 #include "coretypes.h"
35 #include "tree-inline.h"
52 #include "langhooks.h"
53 #include "tree-mudflap.h"
54 #include "tree-gimple.h"
55 #include "diagnostic.h"
56 #include "tree-dump.h"
61 #include "langhooks-def.h"
63 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
65 { NORMAL, /* Ordinary declaration */
66 FUNCDEF, /* Function definition */
67 PARM, /* Declaration of parm before function body */
68 FIELD, /* Declaration inside struct or union */
69 TYPENAME}; /* Typename (inside cast or sizeof) */
72 /* Nonzero if we have seen an invalid cross reference
73 to a struct, union, or enum, but not yet printed the message. */
74 tree pending_invalid_xref;
76 /* File and line to appear in the eventual error message. */
77 location_t pending_invalid_xref_location;
79 /* True means we've initialized exception handling. */
80 bool c_eh_initialized_p;
82 /* While defining an enum type, this is 1 plus the last enumerator
83 constant value. Note that will do not have to save this or `enum_overflow'
84 around nested function definition since such a definition could only
85 occur in an enum value expression and we don't use these variables in
88 static tree enum_next_value;
90 /* Nonzero means that there was overflow computing enum_next_value. */
92 static int enum_overflow;
94 /* The file and line that the prototype came from if this is an
95 old-style definition; used for diagnostics in
96 store_parm_decls_oldstyle. */
98 static location_t current_function_prototype_locus;
100 /* The argument information structure for the function currently being
103 static struct c_arg_info *current_function_arg_info;
105 /* The obstack on which parser and related data structures, which are
106 not live beyond their top-level declaration or definition, are
108 struct obstack parser_obstack;
110 /* The current statement tree. */
112 static GTY(()) struct stmt_tree_s c_stmt_tree;
114 /* State saving variables. */
118 /* Linked list of TRANSLATION_UNIT_DECLS for the translation units
119 included in this invocation. Note that the current translation
120 unit is not included in this list. */
122 static GTY(()) tree all_translation_units;
124 /* A list of decls to be made automatically visible in each file scope. */
125 static GTY(()) tree visible_builtins;
127 /* Set to 0 at beginning of a function definition, set to 1 if
128 a return statement that specifies a return value is seen. */
130 int current_function_returns_value;
132 /* Set to 0 at beginning of a function definition, set to 1 if
133 a return statement with no argument is seen. */
135 int current_function_returns_null;
137 /* Set to 0 at beginning of a function definition, set to 1 if
138 a call to a noreturn function is seen. */
140 int current_function_returns_abnormally;
142 /* Set to nonzero by `grokdeclarator' for a function
143 whose return type is defaulted, if warnings for this are desired. */
145 static int warn_about_return_type;
147 /* Nonzero when starting a function declared `extern inline'. */
149 static int current_extern_inline;
151 /* True means global_bindings_p should return false even if the scope stack
152 says we are in file scope. */
153 bool c_override_global_bindings_to_false;
156 /* Each c_binding structure describes one binding of an identifier to
157 a decl. All the decls in a scope - irrespective of namespace - are
158 chained together by the ->prev field, which (as the name implies)
159 runs in reverse order. All the decls in a given namespace bound to
160 a given identifier are chained by the ->shadowed field, which runs
161 from inner to outer scopes.
163 The ->decl field usually points to a DECL node, but there are two
164 exceptions. In the namespace of type tags, the bound entity is a
165 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
166 identifier is encountered, it is bound to error_mark_node to
167 suppress further errors about that identifier in the current
170 The ->type field stores the type of the declaration in this scope;
171 if NULL, the type is the type of the ->decl field. This is only of
172 relevance for objects with external or internal linkage which may
173 be redeclared in inner scopes, forming composite types that only
174 persist for the duration of those scopes. In the external scope,
175 this stores the composite of all the types declared for this
176 object, visible or not. The ->inner_comp field (used only at file
177 scope) stores whether an incomplete array type at file scope was
178 completed at an inner scope to an array size other than 1.
180 The depth field is copied from the scope structure that holds this
181 decl. It is used to preserve the proper ordering of the ->shadowed
182 field (see bind()) and also for a handful of special-case checks.
183 Finally, the invisible bit is true for a decl which should be
184 ignored for purposes of normal name lookup, and the nested bit is
185 true for a decl that's been bound a second time in an inner scope;
186 in all such cases, the binding in the outer scope will have its
187 invisible bit true. */
189 struct c_binding GTY((chain_next ("%h.prev")))
191 tree decl; /* the decl bound */
192 tree type; /* the type in this scope */
193 tree id; /* the identifier it's bound to */
194 struct c_binding *prev; /* the previous decl in this scope */
195 struct c_binding *shadowed; /* the innermost decl shadowed by this one */
196 unsigned int depth : 28; /* depth of this scope */
197 BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */
198 BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */
199 BOOL_BITFIELD inner_comp : 1; /* incomplete array completed in inner scope */
202 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
203 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
204 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
205 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
207 #define I_SYMBOL_BINDING(node) \
208 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding)
209 #define I_SYMBOL_DECL(node) \
210 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
212 #define I_TAG_BINDING(node) \
213 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding)
214 #define I_TAG_DECL(node) \
215 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
217 #define I_LABEL_BINDING(node) \
218 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding)
219 #define I_LABEL_DECL(node) \
220 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
222 /* Each C symbol points to three linked lists of c_binding structures.
223 These describe the values of the identifier in the three different
224 namespaces defined by the language. */
226 struct lang_identifier GTY(())
228 struct c_common_identifier common_id;
229 struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */
230 struct c_binding *tag_binding; /* struct/union/enum tags */
231 struct c_binding *label_binding; /* labels */
234 /* Validate c-lang.c's assumptions. */
235 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
236 [(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1];
238 /* The resulting tree type. */
241 GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
242 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)")))
244 union tree_node GTY ((tag ("0"),
245 desc ("tree_node_structure (&%h)")))
247 struct lang_identifier GTY ((tag ("1"))) identifier;
250 /* Each c_scope structure describes the complete contents of one
251 scope. Four scopes are distinguished specially: the innermost or
252 current scope, the innermost function scope, the file scope (always
253 the second to outermost) and the outermost or external scope.
255 Most declarations are recorded in the current scope.
257 All normal label declarations are recorded in the innermost
258 function scope, as are bindings of undeclared identifiers to
259 error_mark_node. (GCC permits nested functions as an extension,
260 hence the 'innermost' qualifier.) Explicitly declared labels
261 (using the __label__ extension) appear in the current scope.
263 Being in the file scope (current_scope == file_scope) causes
264 special behavior in several places below. Also, under some
265 conditions the Objective-C front end records declarations in the
266 file scope even though that isn't the current scope.
268 All declarations with external linkage are recorded in the external
269 scope, even if they aren't visible there; this models the fact that
270 such declarations are visible to the entire program, and (with a
271 bit of cleverness, see pushdecl) allows diagnosis of some violations
272 of C99 6.2.2p7 and 6.2.7p2:
274 If, within the same translation unit, the same identifier appears
275 with both internal and external linkage, the behavior is
278 All declarations that refer to the same object or function shall
279 have compatible type; otherwise, the behavior is undefined.
281 Initially only the built-in declarations, which describe compiler
282 intrinsic functions plus a subset of the standard library, are in
285 The order of the blocks list matters, and it is frequently appended
286 to. To avoid having to walk all the way to the end of the list on
287 each insertion, or reverse the list later, we maintain a pointer to
288 the last list entry. (FIXME: It should be feasible to use a reversed
291 The bindings list is strictly in reverse order of declarations;
292 pop_scope relies on this. */
295 struct c_scope GTY((chain_next ("%h.outer")))
297 /* The scope containing this one. */
298 struct c_scope *outer;
300 /* The next outermost function scope. */
301 struct c_scope *outer_function;
303 /* All bindings in this scope. */
304 struct c_binding *bindings;
306 /* For each scope (except the global one), a chain of BLOCK nodes
307 for all the scopes that were entered and exited one level down. */
311 /* The depth of this scope. Used to keep the ->shadowed chain of
312 bindings sorted innermost to outermost. */
313 unsigned int depth : 28;
315 /* True if we are currently filling this scope with parameter
317 BOOL_BITFIELD parm_flag : 1;
319 /* True if we already complained about forward parameter decls
320 in this scope. This prevents double warnings on
321 foo (int a; int b; ...) */
322 BOOL_BITFIELD warned_forward_parm_decls : 1;
324 /* True if this is the outermost block scope of a function body.
325 This scope contains the parameters, the local variables declared
326 in the outermost block, and all the labels (except those in
327 nested functions, or declared at block scope with __label__). */
328 BOOL_BITFIELD function_body : 1;
330 /* True means make a BLOCK for this scope no matter what. */
331 BOOL_BITFIELD keep : 1;
334 /* The scope currently in effect. */
336 static GTY(()) struct c_scope *current_scope;
338 /* The innermost function scope. Ordinary (not explicitly declared)
339 labels, bindings to error_mark_node, and the lazily-created
340 bindings of __func__ and its friends get this scope. */
342 static GTY(()) struct c_scope *current_function_scope;
344 /* The C file scope. This is reset for each input translation unit. */
346 static GTY(()) struct c_scope *file_scope;
348 /* The outermost scope. This is used for all declarations with
349 external linkage, and only these, hence the name. */
351 static GTY(()) struct c_scope *external_scope;
353 /* A chain of c_scope structures awaiting reuse. */
355 static GTY((deletable)) struct c_scope *scope_freelist;
357 /* A chain of c_binding structures awaiting reuse. */
359 static GTY((deletable)) struct c_binding *binding_freelist;
361 /* Append VAR to LIST in scope SCOPE. */
362 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
363 struct c_scope *s_ = (scope); \
365 if (s_->list##_last) \
366 TREE_CHAIN (s_->list##_last) = d_; \
369 s_->list##_last = d_; \
372 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
373 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
374 struct c_scope *t_ = (tscope); \
375 struct c_scope *f_ = (fscope); \
377 TREE_CHAIN (t_->to##_last) = f_->from; \
380 t_->to##_last = f_->from##_last; \
383 /* True means unconditionally make a BLOCK for the next scope pushed. */
385 static bool keep_next_level_flag;
387 /* True means the next call to push_scope will be the outermost scope
388 of a function body, so do not push a new scope, merely cease
389 expecting parameter decls. */
391 static bool next_is_function_body;
393 /* Functions called automatically at the beginning and end of execution. */
395 static GTY(()) tree static_ctors;
396 static GTY(()) tree static_dtors;
398 /* Forward declarations. */
399 static tree lookup_name_in_scope (tree, struct c_scope *);
400 static tree c_make_fname_decl (tree, int);
401 static tree grokdeclarator (const struct c_declarator *,
402 struct c_declspecs *,
403 enum decl_context, bool, tree *);
404 static tree grokparms (struct c_arg_info *, bool);
405 static void layout_array_type (tree);
407 /* States indicating how grokdeclarator() should handle declspecs marked
408 with __attribute__((deprecated)). An object declared as
409 __attribute__((deprecated)) suppresses warnings of uses of other
412 enum deprecated_states {
417 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
420 c_print_identifier (FILE *file, tree node, int indent)
422 print_node (file, "symbol", I_SYMBOL_DECL (node), indent + 4);
423 print_node (file, "tag", I_TAG_DECL (node), indent + 4);
424 print_node (file, "label", I_LABEL_DECL (node), indent + 4);
425 if (C_IS_RESERVED_WORD (node))
427 tree rid = ridpointers[C_RID_CODE (node)];
428 indent_to (file, indent + 4);
429 fprintf (file, "rid " HOST_PTR_PRINTF " \"%s\"",
430 (void *) rid, IDENTIFIER_POINTER (rid));
434 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
435 which may be any of several kinds of DECL or TYPE or error_mark_node,
436 in the scope SCOPE. */
438 bind (tree name, tree decl, struct c_scope *scope, bool invisible, bool nested)
440 struct c_binding *b, **here;
442 if (binding_freelist)
444 b = binding_freelist;
445 binding_freelist = b->prev;
448 b = GGC_NEW (struct c_binding);
453 b->depth = scope->depth;
454 b->invisible = invisible;
460 b->prev = scope->bindings;
466 switch (TREE_CODE (decl))
468 case LABEL_DECL: here = &I_LABEL_BINDING (name); break;
471 case RECORD_TYPE: here = &I_TAG_BINDING (name); break;
477 case ERROR_MARK: here = &I_SYMBOL_BINDING (name); break;
483 /* Locate the appropriate place in the chain of shadowed decls
484 to insert this binding. Normally, scope == current_scope and
485 this does nothing. */
486 while (*here && (*here)->depth > scope->depth)
487 here = &(*here)->shadowed;
493 /* Clear the binding structure B, stick it on the binding_freelist,
494 and return the former value of b->prev. This is used by pop_scope
495 and get_parm_info to iterate destructively over all the bindings
496 from a given scope. */
497 static struct c_binding *
498 free_binding_and_advance (struct c_binding *b)
500 struct c_binding *prev = b->prev;
502 memset (b, 0, sizeof (struct c_binding));
503 b->prev = binding_freelist;
504 binding_freelist = b;
510 /* Hook called at end of compilation to assume 1 elt
511 for a file-scope tentative array defn that wasn't complete before. */
514 c_finish_incomplete_decl (tree decl)
516 if (TREE_CODE (decl) == VAR_DECL)
518 tree type = TREE_TYPE (decl);
519 if (type != error_mark_node
520 && TREE_CODE (type) == ARRAY_TYPE
521 && !DECL_EXTERNAL (decl)
522 && TYPE_DOMAIN (type) == 0)
524 warning ("%Jarray %qD assumed to have one element", decl, decl);
526 complete_array_type (type, NULL_TREE, 1);
528 layout_decl (decl, 0);
533 /* The Objective-C front-end often needs to determine the current scope. */
536 objc_get_current_scope (void)
538 return current_scope;
541 /* The following function is used only by Objective-C. It needs to live here
542 because it accesses the innards of c_scope. */
545 objc_mark_locals_volatile (void *enclosing_blk)
547 struct c_scope *scope;
550 for (scope = current_scope;
551 scope && scope != enclosing_blk;
552 scope = scope->outer)
554 for (b = scope->bindings; b; b = b->prev)
556 if (TREE_CODE (b->decl) == VAR_DECL
557 || TREE_CODE (b->decl) == PARM_DECL)
559 C_DECL_REGISTER (b->decl) = 0;
560 DECL_REGISTER (b->decl) = 0;
561 TREE_THIS_VOLATILE (b->decl) = 1;
565 /* Do not climb up past the current function. */
566 if (scope->function_body)
571 /* Nonzero if we are currently in file scope. */
574 global_bindings_p (void)
576 return current_scope == file_scope && !c_override_global_bindings_to_false;
580 keep_next_level (void)
582 keep_next_level_flag = true;
585 /* Identify this scope as currently being filled with parameters. */
588 declare_parm_level (void)
590 current_scope->parm_flag = true;
596 if (next_is_function_body)
598 /* This is the transition from the parameters to the top level
599 of the function body. These are the same scope
600 (C99 6.2.1p4,6) so we do not push another scope structure.
601 next_is_function_body is set only by store_parm_decls, which
602 in turn is called when and only when we are about to
603 encounter the opening curly brace for the function body.
605 The outermost block of a function always gets a BLOCK node,
606 because the debugging output routines expect that each
607 function has at least one BLOCK. */
608 current_scope->parm_flag = false;
609 current_scope->function_body = true;
610 current_scope->keep = true;
611 current_scope->outer_function = current_function_scope;
612 current_function_scope = current_scope;
614 keep_next_level_flag = false;
615 next_is_function_body = false;
619 struct c_scope *scope;
622 scope = scope_freelist;
623 scope_freelist = scope->outer;
626 scope = GGC_CNEW (struct c_scope);
628 scope->keep = keep_next_level_flag;
629 scope->outer = current_scope;
630 scope->depth = current_scope ? (current_scope->depth + 1) : 0;
632 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
634 if (current_scope && scope->depth == 0)
637 sorry ("GCC supports only %u nested scopes", scope->depth);
640 current_scope = scope;
641 keep_next_level_flag = false;
645 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
648 set_type_context (tree type, tree context)
650 for (type = TYPE_MAIN_VARIANT (type); type;
651 type = TYPE_NEXT_VARIANT (type))
652 TYPE_CONTEXT (type) = context;
655 /* Exit a scope. Restore the state of the identifier-decl mappings
656 that were in effect when this scope was entered. Return a BLOCK
657 node containing all the DECLs in this scope that are of interest
658 to debug info generation. */
663 struct c_scope *scope = current_scope;
664 tree block, context, p;
667 bool functionbody = scope->function_body;
668 bool keep = functionbody || scope->keep || scope->bindings;
670 /* If appropriate, create a BLOCK to record the decls for the life
675 block = make_node (BLOCK);
676 BLOCK_SUBBLOCKS (block) = scope->blocks;
677 TREE_USED (block) = 1;
679 /* In each subblock, record that this is its superior. */
680 for (p = scope->blocks; p; p = TREE_CHAIN (p))
681 BLOCK_SUPERCONTEXT (p) = block;
683 BLOCK_VARS (block) = 0;
686 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
687 scope must be set so that they point to the appropriate
688 construct, i.e. either to the current FUNCTION_DECL node, or
689 else to the BLOCK node we just constructed.
691 Note that for tagged types whose scope is just the formal
692 parameter list for some function type specification, we can't
693 properly set their TYPE_CONTEXTs here, because we don't have a
694 pointer to the appropriate FUNCTION_TYPE node readily available
695 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
696 type nodes get set in `grokdeclarator' as soon as we have created
697 the FUNCTION_TYPE node which will represent the "scope" for these
698 "parameter list local" tagged types. */
699 if (scope->function_body)
700 context = current_function_decl;
701 else if (scope == file_scope)
703 tree file_decl = build_decl (TRANSLATION_UNIT_DECL, 0, 0);
704 TREE_CHAIN (file_decl) = all_translation_units;
705 all_translation_units = file_decl;
711 /* Clear all bindings in this scope. */
712 for (b = scope->bindings; b; b = free_binding_and_advance (b))
715 switch (TREE_CODE (p))
718 /* Warnings for unused labels, errors for undefined labels. */
719 if (TREE_USED (p) && !DECL_INITIAL (p))
721 error ("%Jlabel %qD used but not defined", p, p);
722 DECL_INITIAL (p) = error_mark_node;
724 else if (!TREE_USED (p) && warn_unused_label)
726 if (DECL_INITIAL (p))
727 warning ("%Jlabel %qD defined but not used", p, p);
729 warning ("%Jlabel %qD declared but not defined", p, p);
731 /* Labels go in BLOCK_VARS. */
732 TREE_CHAIN (p) = BLOCK_VARS (block);
733 BLOCK_VARS (block) = p;
734 gcc_assert (I_LABEL_BINDING (b->id) == b);
735 I_LABEL_BINDING (b->id) = b->shadowed;
741 set_type_context (p, context);
743 /* Types may not have tag-names, in which case the type
744 appears in the bindings list with b->id NULL. */
747 gcc_assert (I_TAG_BINDING (b->id) == b);
748 I_TAG_BINDING (b->id) = b->shadowed;
753 /* Propagate TREE_ADDRESSABLE from nested functions to their
754 containing functions. */
755 if (!TREE_ASM_WRITTEN (p)
756 && DECL_INITIAL (p) != 0
757 && TREE_ADDRESSABLE (p)
758 && DECL_ABSTRACT_ORIGIN (p) != 0
759 && DECL_ABSTRACT_ORIGIN (p) != p)
760 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
764 /* Warnings for unused variables. */
765 if (warn_unused_variable
767 && !DECL_IN_SYSTEM_HEADER (p)
769 && !DECL_ARTIFICIAL (p)
770 && scope != file_scope
771 && scope != external_scope)
772 warning ("%Junused variable %qD", p, p);
776 error ("%Jtype of array %qD completed incompatibly with"
777 " implicit initialization", p, p);
784 /* All of these go in BLOCK_VARS, but only if this is the
785 binding in the home scope. */
788 TREE_CHAIN (p) = BLOCK_VARS (block);
789 BLOCK_VARS (block) = p;
791 /* If this is the file scope, and we are processing more
792 than one translation unit in this compilation, set
793 DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL.
794 This makes same_translation_unit_p work, and causes
795 static declarations to be given disambiguating suffixes. */
796 if (scope == file_scope && num_in_fnames > 1)
798 DECL_CONTEXT (p) = context;
799 if (TREE_CODE (p) == TYPE_DECL)
800 set_type_context (TREE_TYPE (p), context);
804 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
805 already been put there by store_parm_decls. Unused-
806 parameter warnings are handled by function.c.
807 error_mark_node obviously does not go in BLOCK_VARS and
808 does not get unused-variable warnings. */
811 /* It is possible for a decl not to have a name. We get
812 here with b->id NULL in this case. */
815 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
816 I_SYMBOL_BINDING (b->id) = b->shadowed;
817 if (b->shadowed && b->shadowed->type)
818 TREE_TYPE (b->shadowed->decl) = b->shadowed->type;
828 /* Dispose of the block that we just made inside some higher level. */
829 if ((scope->function_body || scope == file_scope) && context)
831 DECL_INITIAL (context) = block;
832 BLOCK_SUPERCONTEXT (block) = context;
834 else if (scope->outer)
837 SCOPE_LIST_APPEND (scope->outer, blocks, block);
838 /* If we did not make a block for the scope just exited, any
839 blocks made for inner scopes must be carried forward so they
840 will later become subblocks of something else. */
841 else if (scope->blocks)
842 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
845 /* Pop the current scope, and free the structure for reuse. */
846 current_scope = scope->outer;
847 if (scope->function_body)
848 current_function_scope = scope->outer_function;
850 memset (scope, 0, sizeof (struct c_scope));
851 scope->outer = scope_freelist;
852 scope_freelist = scope;
858 push_file_scope (void)
866 file_scope = current_scope;
868 start_fname_decls ();
870 for (decl = visible_builtins; decl; decl = TREE_CHAIN (decl))
871 bind (DECL_NAME (decl), decl, file_scope,
872 /*invisible=*/false, /*nested=*/true);
876 pop_file_scope (void)
878 /* In case there were missing closebraces, get us back to the global
880 while (current_scope != file_scope)
883 /* __FUNCTION__ is defined at file scope (""). This
884 call may not be necessary as my tests indicate it
885 still works without it. */
886 finish_fname_decls ();
888 /* This is the point to write out a PCH if we're doing that.
889 In that case we do not want to do anything else. */
892 c_common_write_pch ();
896 /* Pop off the file scope and close this translation unit. */
899 cgraph_finalize_compilation_unit ();
902 /* Insert BLOCK at the end of the list of subblocks of the current
903 scope. This is used when a BIND_EXPR is expanded, to handle the
904 BLOCK node inside the BIND_EXPR. */
907 insert_block (tree block)
909 TREE_USED (block) = 1;
910 SCOPE_LIST_APPEND (current_scope, blocks, block);
913 /* Push a definition or a declaration of struct, union or enum tag "name".
914 "type" should be the type node.
915 We assume that the tag "name" is not already defined.
917 Note that the definition may really be just a forward reference.
918 In that case, the TYPE_SIZE will be zero. */
921 pushtag (tree name, tree type)
923 /* Record the identifier as the type's name if it has none. */
924 if (name && !TYPE_NAME (type))
925 TYPE_NAME (type) = name;
926 bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false);
928 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
929 tagged type we just added to the current scope. This fake
930 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
931 to output a representation of a tagged type, and it also gives
932 us a convenient place to record the "scope start" address for the
935 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
937 /* An approximation for now, so we can tell this is a function-scope tag.
938 This will be updated in pop_scope. */
939 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
942 /* Subroutine of compare_decls. Allow harmless mismatches in return
943 and argument types provided that the type modes match. This function
944 return a unified type given a suitable match, and 0 otherwise. */
947 match_builtin_function_types (tree newtype, tree oldtype)
949 tree newrettype, oldrettype;
950 tree newargs, oldargs;
951 tree trytype, tryargs;
953 /* Accept the return type of the new declaration if same modes. */
954 oldrettype = TREE_TYPE (oldtype);
955 newrettype = TREE_TYPE (newtype);
957 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
960 oldargs = TYPE_ARG_TYPES (oldtype);
961 newargs = TYPE_ARG_TYPES (newtype);
964 while (oldargs || newargs)
968 || !TREE_VALUE (oldargs)
969 || !TREE_VALUE (newargs)
970 || TYPE_MODE (TREE_VALUE (oldargs))
971 != TYPE_MODE (TREE_VALUE (newargs)))
974 oldargs = TREE_CHAIN (oldargs);
975 newargs = TREE_CHAIN (newargs);
978 trytype = build_function_type (newrettype, tryargs);
979 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
982 /* Subroutine of diagnose_mismatched_decls. Check for function type
983 mismatch involving an empty arglist vs a nonempty one and give clearer
986 diagnose_arglist_conflict (tree newdecl, tree olddecl,
987 tree newtype, tree oldtype)
991 if (TREE_CODE (olddecl) != FUNCTION_DECL
992 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype))
993 || !((TYPE_ARG_TYPES (oldtype) == 0 && DECL_INITIAL (olddecl) == 0)
995 (TYPE_ARG_TYPES (newtype) == 0 && DECL_INITIAL (newdecl) == 0)))
998 t = TYPE_ARG_TYPES (oldtype);
1000 t = TYPE_ARG_TYPES (newtype);
1001 for (; t; t = TREE_CHAIN (t))
1003 tree type = TREE_VALUE (t);
1005 if (TREE_CHAIN (t) == 0
1006 && TYPE_MAIN_VARIANT (type) != void_type_node)
1008 inform ("a parameter list with an ellipsis can%'t match "
1009 "an empty parameter name list declaration");
1013 if (c_type_promotes_to (type) != type)
1015 inform ("an argument type that has a default promotion can%'t match "
1016 "an empty parameter name list declaration");
1022 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1023 old-style function definition, NEWDECL is a prototype declaration.
1024 Diagnose inconsistencies in the argument list. Returns TRUE if
1025 the prototype is compatible, FALSE if not. */
1027 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
1029 tree newargs, oldargs;
1032 /* ??? Elsewhere TYPE_MAIN_VARIANT is not used in this context. */
1033 #define END_OF_ARGLIST(t) (TYPE_MAIN_VARIANT (t) == void_type_node)
1035 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
1036 newargs = TYPE_ARG_TYPES (newtype);
1041 tree oldargtype = TREE_VALUE (oldargs);
1042 tree newargtype = TREE_VALUE (newargs);
1044 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
1047 /* Reaching the end of just one list means the two decls don't
1048 agree on the number of arguments. */
1049 if (END_OF_ARGLIST (oldargtype))
1051 error ("%Jprototype for %qD declares more arguments "
1052 "than previous old-style definition", newdecl, newdecl);
1055 else if (END_OF_ARGLIST (newargtype))
1057 error ("%Jprototype for %qD declares fewer arguments "
1058 "than previous old-style definition", newdecl, newdecl);
1062 /* Type for passing arg must be consistent with that declared
1064 else if (!comptypes (oldargtype, newargtype))
1066 error ("%Jprototype for %qD declares argument %d"
1067 " with incompatible type",
1068 newdecl, newdecl, i);
1072 oldargs = TREE_CHAIN (oldargs);
1073 newargs = TREE_CHAIN (newargs);
1077 /* If we get here, no errors were found, but do issue a warning
1078 for this poor-style construct. */
1079 warning ("%Jprototype for %qD follows non-prototype definition",
1082 #undef END_OF_ARGLIST
1085 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1086 first in a pair of mismatched declarations, using the diagnostic
1089 locate_old_decl (tree decl, void (*diag)(const char *, ...))
1091 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
1093 else if (DECL_INITIAL (decl))
1094 diag (N_("%Jprevious definition of %qD was here"), decl, decl);
1095 else if (C_DECL_IMPLICIT (decl))
1096 diag (N_("%Jprevious implicit declaration of %qD was here"), decl, decl);
1098 diag (N_("%Jprevious declaration of %qD was here"), decl, decl);
1101 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1102 Returns true if the caller should proceed to merge the two, false
1103 if OLDDECL should simply be discarded. As a side effect, issues
1104 all necessary diagnostics for invalid or poor-style combinations.
1105 If it returns true, writes the types of NEWDECL and OLDDECL to
1106 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1107 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1110 diagnose_mismatched_decls (tree newdecl, tree olddecl,
1111 tree *newtypep, tree *oldtypep)
1113 tree newtype, oldtype;
1114 bool pedwarned = false;
1115 bool warned = false;
1117 /* If we have error_mark_node for either decl or type, just discard
1118 the previous decl - we're in an error cascade already. */
1119 if (olddecl == error_mark_node || newdecl == error_mark_node)
1121 *oldtypep = oldtype = TREE_TYPE (olddecl);
1122 *newtypep = newtype = TREE_TYPE (newdecl);
1123 if (oldtype == error_mark_node || newtype == error_mark_node)
1126 /* Two different categories of symbol altogether. This is an error
1127 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1128 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1130 if (!(TREE_CODE (olddecl) == FUNCTION_DECL
1131 && DECL_BUILT_IN (olddecl)
1132 && !C_DECL_DECLARED_BUILTIN (olddecl)))
1134 error ("%J%qD redeclared as different kind of symbol",
1136 locate_old_decl (olddecl, error);
1138 else if (TREE_PUBLIC (newdecl))
1139 warning ("%Jbuilt-in function %qD declared as non-function",
1141 else if (warn_shadow)
1142 warning ("%Jdeclaration of %qD shadows a built-in function",
1147 /* Enumerators have no linkage, so may only be declared once in a
1149 if (TREE_CODE (olddecl) == CONST_DECL)
1151 error ("%Jredeclaration of enumerator %qD", newdecl, newdecl);
1152 locate_old_decl (olddecl, error);
1156 if (!comptypes (oldtype, newtype))
1158 if (TREE_CODE (olddecl) == FUNCTION_DECL
1159 && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl))
1161 /* Accept harmless mismatch in function types.
1162 This is for the ffs and fprintf builtins. */
1163 tree trytype = match_builtin_function_types (newtype, oldtype);
1165 if (trytype && comptypes (newtype, trytype))
1166 *oldtypep = oldtype = trytype;
1169 /* If types don't match for a built-in, throw away the
1170 built-in. No point in calling locate_old_decl here, it
1171 won't print anything. */
1172 warning ("%Jconflicting types for built-in function %qD",
1177 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1178 && DECL_IS_BUILTIN (olddecl))
1180 /* A conflicting function declaration for a predeclared
1181 function that isn't actually built in. Objective C uses
1182 these. The new declaration silently overrides everything
1183 but the volatility (i.e. noreturn) indication. See also
1184 below. FIXME: Make Objective C use normal builtins. */
1185 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1188 /* Permit void foo (...) to match int foo (...) if the latter is
1189 the definition and implicit int was used. See
1190 c-torture/compile/920625-2.c. */
1191 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
1192 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
1193 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
1194 && C_FUNCTION_IMPLICIT_INT (newdecl) && !DECL_INITIAL (olddecl))
1196 pedwarn ("%Jconflicting types for %qD", newdecl, newdecl);
1197 /* Make sure we keep void as the return type. */
1198 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
1199 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1202 /* Permit void foo (...) to match an earlier call to foo (...) with
1203 no declared type (thus, implicitly int). */
1204 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1205 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == void_type_node
1206 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == integer_type_node
1207 && C_DECL_IMPLICIT (olddecl) && !DECL_INITIAL (olddecl))
1209 pedwarn ("%Jconflicting types for %qD", newdecl, newdecl);
1210 /* Make sure we keep void as the return type. */
1211 TREE_TYPE (olddecl) = *oldtypep = oldtype = newtype;
1216 if (TYPE_QUALS (newtype) != TYPE_QUALS (oldtype))
1217 error ("%J conflicting type qualifiers for %qD", newdecl, newdecl);
1219 error ("%Jconflicting types for %qD", newdecl, newdecl);
1220 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
1221 locate_old_decl (olddecl, error);
1226 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1227 but silently ignore the redeclaration if either is in a system
1228 header. (Conflicting redeclarations were handled above.) */
1229 if (TREE_CODE (newdecl) == TYPE_DECL)
1231 if (DECL_IN_SYSTEM_HEADER (newdecl) || DECL_IN_SYSTEM_HEADER (olddecl))
1232 return true; /* Allow OLDDECL to continue in use. */
1234 error ("%Jredefinition of typedef %qD", newdecl, newdecl);
1235 locate_old_decl (olddecl, error);
1239 /* Function declarations can either be 'static' or 'extern' (no
1240 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1241 can never conflict with each other on account of linkage (6.2.2p4).
1242 Multiple definitions are not allowed (6.9p3,5) but GCC permits
1243 two definitions if one is 'extern inline' and one is not. The non-
1244 extern-inline definition supersedes the extern-inline definition. */
1245 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1247 /* If you declare a built-in function name as static, or
1248 define the built-in with an old-style definition (so we
1249 can't validate the argument list) the built-in definition is
1250 overridden, but optionally warn this was a bad choice of name. */
1251 if (DECL_BUILT_IN (olddecl)
1252 && !C_DECL_DECLARED_BUILTIN (olddecl)
1253 && (!TREE_PUBLIC (newdecl)
1254 || (DECL_INITIAL (newdecl)
1255 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl)))))
1258 warning ("%Jdeclaration of %qD shadows a built-in function",
1260 /* Discard the old built-in function. */
1264 if (DECL_INITIAL (newdecl))
1266 if (DECL_INITIAL (olddecl)
1267 && !(DECL_DECLARED_INLINE_P (olddecl)
1268 && DECL_EXTERNAL (olddecl)
1269 && !(DECL_DECLARED_INLINE_P (newdecl)
1270 && DECL_EXTERNAL (newdecl)
1271 && same_translation_unit_p (olddecl, newdecl))))
1273 error ("%Jredefinition of %qD", newdecl, newdecl);
1274 locate_old_decl (olddecl, error);
1278 /* If we have a prototype after an old-style function definition,
1279 the argument types must be checked specially. */
1280 else if (DECL_INITIAL (olddecl)
1281 && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype)
1282 && TYPE_ACTUAL_ARG_TYPES (oldtype)
1283 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
1285 locate_old_decl (olddecl, error);
1288 /* A non-static declaration (even an "extern") followed by a
1289 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1290 The same is true for a static forward declaration at block
1291 scope followed by a non-static declaration/definition at file
1292 scope. Static followed by non-static at the same scope is
1293 not undefined behavior, and is the most convenient way to get
1294 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1295 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1296 we do diagnose it if -Wtraditional. */
1297 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
1299 /* Two exceptions to the rule. If olddecl is an extern
1300 inline, or a predeclared function that isn't actually
1301 built in, newdecl silently overrides olddecl. The latter
1302 occur only in Objective C; see also above. (FIXME: Make
1303 Objective C use normal builtins.) */
1304 if (!DECL_IS_BUILTIN (olddecl)
1305 && !(DECL_EXTERNAL (olddecl)
1306 && DECL_DECLARED_INLINE_P (olddecl)))
1308 error ("%Jstatic declaration of %qD follows "
1309 "non-static declaration", newdecl, newdecl);
1310 locate_old_decl (olddecl, error);
1314 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl))
1316 if (DECL_CONTEXT (olddecl))
1318 error ("%Jnon-static declaration of %qD follows "
1319 "static declaration", newdecl, newdecl);
1320 locate_old_decl (olddecl, error);
1323 else if (warn_traditional)
1325 warning ("%Jnon-static declaration of %qD follows "
1326 "static declaration", newdecl, newdecl);
1331 else if (TREE_CODE (newdecl) == VAR_DECL)
1333 /* Only variables can be thread-local, and all declarations must
1334 agree on this property. */
1335 if (DECL_THREAD_LOCAL (newdecl) != DECL_THREAD_LOCAL (olddecl))
1337 if (DECL_THREAD_LOCAL (newdecl))
1338 error ("%Jthread-local declaration of %qD follows "
1339 "non-thread-local declaration", newdecl, newdecl);
1341 error ("%Jnon-thread-local declaration of %qD follows "
1342 "thread-local declaration", newdecl, newdecl);
1344 locate_old_decl (olddecl, error);
1348 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1349 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
1351 error ("%Jredefinition of %qD", newdecl, newdecl);
1352 locate_old_decl (olddecl, error);
1356 /* Objects declared at file scope: if the first declaration had
1357 external linkage (even if it was an external reference) the
1358 second must have external linkage as well, or the behavior is
1359 undefined. If the first declaration had internal linkage, then
1360 the second must too, or else be an external reference (in which
1361 case the composite declaration still has internal linkage).
1362 As for function declarations, we warn about the static-then-
1363 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1364 if (DECL_FILE_SCOPE_P (newdecl)
1365 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
1367 if (DECL_EXTERNAL (newdecl))
1369 if (!DECL_FILE_SCOPE_P (olddecl))
1371 error ("%Jextern declaration of %qD follows "
1372 "declaration with no linkage", newdecl, newdecl);
1373 locate_old_decl (olddecl, error);
1376 else if (warn_traditional)
1378 warning ("%Jnon-static declaration of %qD follows "
1379 "static declaration", newdecl, newdecl);
1385 if (TREE_PUBLIC (newdecl))
1386 error ("%Jnon-static declaration of %qD follows "
1387 "static declaration", newdecl, newdecl);
1389 error ("%Jstatic declaration of %qD follows "
1390 "non-static declaration", newdecl, newdecl);
1392 locate_old_decl (olddecl, error);
1396 /* Two objects with the same name declared at the same block
1397 scope must both be external references (6.7p3). */
1398 else if (!DECL_FILE_SCOPE_P (newdecl))
1400 if (DECL_EXTERNAL (newdecl))
1402 /* Extern with initializer at block scope, which will
1403 already have received an error. */
1405 else if (DECL_EXTERNAL (olddecl))
1407 error ("%Jdeclaration of %qD with no linkage follows "
1408 "extern declaration", newdecl, newdecl);
1409 locate_old_decl (olddecl, error);
1413 error ("%Jredeclaration of %qD with no linkage",
1415 locate_old_decl (olddecl, error);
1423 /* All decls must agree on a visibility. */
1424 if (DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl)
1425 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1427 warning ("%Jredeclaration of %qD with different visibility "
1428 "(old visibility preserved)", newdecl, newdecl);
1432 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1434 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
1435 if (DECL_DECLARED_INLINE_P (newdecl)
1436 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1438 warning ("%Jinline declaration of %qD follows "
1439 "declaration with attribute noinline", newdecl, newdecl);
1442 else if (DECL_DECLARED_INLINE_P (olddecl)
1443 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1445 warning ("%Jdeclaration of %qD with attribute noinline follows "
1446 "inline declaration ", newdecl, newdecl);
1450 /* Inline declaration after use or definition.
1451 ??? Should we still warn about this now we have unit-at-a-time
1452 mode and can get it right?
1453 Definitely don't complain if the decls are in different translation
1455 if (DECL_DECLARED_INLINE_P (newdecl) && !DECL_DECLARED_INLINE_P (olddecl)
1456 && same_translation_unit_p (olddecl, newdecl))
1458 if (TREE_USED (olddecl))
1460 warning ("%J%qD declared inline after being called",
1464 else if (DECL_INITIAL (olddecl))
1466 warning ("%J%qD declared inline after its definition",
1472 else /* PARM_DECL, VAR_DECL */
1474 /* Redeclaration of a parameter is a constraint violation (this is
1475 not explicitly stated, but follows from C99 6.7p3 [no more than
1476 one declaration of the same identifier with no linkage in the
1477 same scope, except type tags] and 6.2.2p6 [parameters have no
1478 linkage]). We must check for a forward parameter declaration,
1479 indicated by TREE_ASM_WRITTEN on the old declaration - this is
1480 an extension, the mandatory diagnostic for which is handled by
1481 mark_forward_parm_decls. */
1483 if (TREE_CODE (newdecl) == PARM_DECL
1484 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
1486 error ("%Jredefinition of parameter %qD", newdecl, newdecl);
1487 locate_old_decl (olddecl, error);
1492 /* Optional warning for completely redundant decls. */
1493 if (!warned && !pedwarned
1494 && warn_redundant_decls
1495 /* Don't warn about a function declaration followed by a
1497 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1498 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
1499 /* Don't warn about redundant redeclarations of builtins. */
1500 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1501 && !DECL_BUILT_IN (newdecl)
1502 && DECL_BUILT_IN (olddecl)
1503 && !C_DECL_DECLARED_BUILTIN (olddecl))
1504 /* Don't warn about an extern followed by a definition. */
1505 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
1506 /* Don't warn about forward parameter decls. */
1507 && !(TREE_CODE (newdecl) == PARM_DECL
1508 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl)))
1510 warning ("%Jredundant redeclaration of %qD", newdecl, newdecl);
1514 /* Report location of previous decl/defn in a consistent manner. */
1515 if (warned || pedwarned)
1516 locate_old_decl (olddecl, pedwarned ? pedwarn : warning);
1521 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1522 consistent with OLDDECL, but carries new information. Merge the
1523 new information into OLDDECL. This function issues no
1527 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
1529 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1530 && DECL_INITIAL (newdecl) != 0);
1532 /* For real parm decl following a forward decl, rechain the old decl
1533 in its new location and clear TREE_ASM_WRITTEN (it's not a
1534 forward decl anymore). */
1535 if (TREE_CODE (newdecl) == PARM_DECL
1536 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1538 struct c_binding *b, **here;
1540 for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
1541 if ((*here)->decl == olddecl)
1548 b->prev = current_scope->bindings;
1549 current_scope->bindings = b;
1551 TREE_ASM_WRITTEN (olddecl) = 0;
1554 DECL_ATTRIBUTES (newdecl)
1555 = targetm.merge_decl_attributes (olddecl, newdecl);
1557 /* Merge the data types specified in the two decls. */
1559 = TREE_TYPE (olddecl)
1560 = composite_type (newtype, oldtype);
1562 /* Lay the type out, unless already done. */
1563 if (!comptypes (oldtype, TREE_TYPE (newdecl)))
1565 if (TREE_TYPE (newdecl) != error_mark_node)
1566 layout_type (TREE_TYPE (newdecl));
1567 if (TREE_CODE (newdecl) != FUNCTION_DECL
1568 && TREE_CODE (newdecl) != TYPE_DECL
1569 && TREE_CODE (newdecl) != CONST_DECL)
1570 layout_decl (newdecl, 0);
1574 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1575 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1576 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1577 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1578 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1579 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1581 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1582 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1586 /* Keep the old rtl since we can safely use it. */
1587 COPY_DECL_RTL (olddecl, newdecl);
1589 /* Merge the type qualifiers. */
1590 if (TREE_READONLY (newdecl))
1591 TREE_READONLY (olddecl) = 1;
1593 if (TREE_THIS_VOLATILE (newdecl))
1595 TREE_THIS_VOLATILE (olddecl) = 1;
1596 if (TREE_CODE (newdecl) == VAR_DECL)
1597 make_var_volatile (newdecl);
1600 /* Merge deprecatedness. */
1601 if (TREE_DEPRECATED (newdecl))
1602 TREE_DEPRECATED (olddecl) = 1;
1604 /* Keep source location of definition rather than declaration. */
1605 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1606 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1608 /* Merge the unused-warning information. */
1609 if (DECL_IN_SYSTEM_HEADER (olddecl))
1610 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1611 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1612 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1614 /* Merge the initialization information. */
1615 if (DECL_INITIAL (newdecl) == 0)
1616 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1618 /* Merge the section attribute.
1619 We want to issue an error if the sections conflict but that must be
1620 done later in decl_attributes since we are called before attributes
1622 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1623 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1625 /* Copy the assembler name.
1626 Currently, it can only be defined in the prototype. */
1627 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1629 /* Use visibility of whichever declaration had it specified */
1630 if (DECL_VISIBILITY_SPECIFIED (olddecl))
1632 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1633 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
1636 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1638 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1639 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1640 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1641 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1642 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1643 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1644 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1645 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1646 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1649 /* Merge the storage class information. */
1650 merge_weak (newdecl, olddecl);
1652 /* For functions, static overrides non-static. */
1653 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1655 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1656 /* This is since we don't automatically
1657 copy the attributes of NEWDECL into OLDDECL. */
1658 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1659 /* If this clears `static', clear it in the identifier too. */
1660 if (!TREE_PUBLIC (olddecl))
1661 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1663 if (DECL_EXTERNAL (newdecl))
1665 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1666 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1668 /* An extern decl does not override previous storage class. */
1669 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1670 if (!DECL_EXTERNAL (newdecl))
1672 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1673 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1678 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1679 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1682 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1684 /* If we're redefining a function previously defined as extern
1685 inline, make sure we emit debug info for the inline before we
1686 throw it away, in case it was inlined into a function that hasn't
1687 been written out yet. */
1688 if (new_is_definition && DECL_INITIAL (olddecl))
1690 if (TREE_USED (olddecl)
1691 /* In unit-at-a-time mode we never inline re-defined extern
1692 inline functions. */
1693 && !flag_unit_at_a_time
1694 && cgraph_function_possibly_inlined_p (olddecl))
1695 (*debug_hooks->outlining_inline_function) (olddecl);
1697 /* The new defn must not be inline. */
1698 DECL_INLINE (newdecl) = 0;
1699 DECL_UNINLINABLE (newdecl) = 1;
1703 /* If either decl says `inline', this fn is inline,
1704 unless its definition was passed already. */
1705 if (DECL_DECLARED_INLINE_P (newdecl)
1706 || DECL_DECLARED_INLINE_P (olddecl))
1707 DECL_DECLARED_INLINE_P (newdecl) = 1;
1709 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1710 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1713 if (DECL_BUILT_IN (olddecl))
1715 /* If redeclaring a builtin function, it stays built in.
1716 But it gets tagged as having been declared. */
1717 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1718 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1719 C_DECL_DECLARED_BUILTIN (newdecl) = 1;
1722 /* Also preserve various other info from the definition. */
1723 if (!new_is_definition)
1725 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1726 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1727 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1728 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1729 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1731 /* Set DECL_INLINE on the declaration if we've got a body
1732 from which to instantiate. */
1733 if (DECL_INLINE (olddecl) && !DECL_UNINLINABLE (newdecl))
1735 DECL_INLINE (newdecl) = 1;
1736 DECL_ABSTRACT_ORIGIN (newdecl)
1737 = DECL_ABSTRACT_ORIGIN (olddecl);
1742 /* If a previous declaration said inline, mark the
1743 definition as inlinable. */
1744 if (DECL_DECLARED_INLINE_P (newdecl)
1745 && !DECL_UNINLINABLE (newdecl))
1746 DECL_INLINE (newdecl) = 1;
1750 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1751 But preserve OLDDECL's DECL_UID and DECL_CONTEXT. */
1753 unsigned olddecl_uid = DECL_UID (olddecl);
1754 tree olddecl_context = DECL_CONTEXT (olddecl);
1756 memcpy ((char *) olddecl + sizeof (struct tree_common),
1757 (char *) newdecl + sizeof (struct tree_common),
1758 sizeof (struct tree_decl) - sizeof (struct tree_common));
1759 DECL_UID (olddecl) = olddecl_uid;
1760 DECL_CONTEXT (olddecl) = olddecl_context;
1763 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1764 so that encode_section_info has a chance to look at the new decl
1765 flags and attributes. */
1766 if (DECL_RTL_SET_P (olddecl)
1767 && (TREE_CODE (olddecl) == FUNCTION_DECL
1768 || (TREE_CODE (olddecl) == VAR_DECL
1769 && TREE_STATIC (olddecl))))
1770 make_decl_rtl (olddecl);
1773 /* Handle when a new declaration NEWDECL has the same name as an old
1774 one OLDDECL in the same binding contour. Prints an error message
1777 If safely possible, alter OLDDECL to look like NEWDECL, and return
1778 true. Otherwise, return false. */
1781 duplicate_decls (tree newdecl, tree olddecl)
1783 tree newtype = NULL, oldtype = NULL;
1785 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
1788 merge_decls (newdecl, olddecl, newtype, oldtype);
1793 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
1795 warn_if_shadowing (tree new_decl)
1797 struct c_binding *b;
1799 /* Shadow warnings wanted? */
1801 /* No shadow warnings for internally generated vars. */
1802 || DECL_IS_BUILTIN (new_decl)
1803 /* No shadow warnings for vars made for inlining. */
1804 || DECL_FROM_INLINE (new_decl)
1805 /* Don't warn about the parm names in function declarator
1806 within a function declarator. It would be nice to avoid
1807 warning in any function declarator in a declaration, as
1808 opposed to a definition, but there is no way to tell
1809 it's not a definition at this point. */
1810 || (TREE_CODE (new_decl) == PARM_DECL && current_scope->outer->parm_flag))
1813 /* Is anything being shadowed? Invisible decls do not count. */
1814 for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed)
1815 if (b->decl && b->decl != new_decl && !b->invisible)
1817 tree old_decl = b->decl;
1819 if (TREE_CODE (old_decl) == PARM_DECL)
1820 warning ("%Jdeclaration of %qD shadows a parameter",
1821 new_decl, new_decl);
1822 else if (DECL_FILE_SCOPE_P (old_decl))
1823 warning ("%Jdeclaration of %qD shadows a global declaration",
1824 new_decl, new_decl);
1825 else if (TREE_CODE (old_decl) == FUNCTION_DECL
1826 && DECL_BUILT_IN (old_decl))
1827 warning ("%Jdeclaration of %qD shadows a built-in function",
1828 new_decl, new_decl);
1830 warning ("%Jdeclaration of %qD shadows a previous local",
1831 new_decl, new_decl);
1833 if (TREE_CODE (old_decl) != FUNCTION_DECL
1834 || !DECL_BUILT_IN (old_decl))
1835 warning ("%Jshadowed declaration is here", old_decl);
1842 /* Subroutine of pushdecl.
1844 X is a TYPE_DECL for a typedef statement. Create a brand new
1845 ..._TYPE node (which will be just a variant of the existing
1846 ..._TYPE node with identical properties) and then install X
1847 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1849 The whole point here is to end up with a situation where each
1850 and every ..._TYPE node the compiler creates will be uniquely
1851 associated with AT MOST one node representing a typedef name.
1852 This way, even though the compiler substitutes corresponding
1853 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1854 early on, later parts of the compiler can always do the reverse
1855 translation and get back the corresponding typedef name. For
1858 typedef struct S MY_TYPE;
1861 Later parts of the compiler might only know that `object' was of
1862 type `struct S' if it were not for code just below. With this
1863 code however, later parts of the compiler see something like:
1865 struct S' == struct S
1866 typedef struct S' MY_TYPE;
1869 And they can then deduce (from the node for type struct S') that
1870 the original object declaration was:
1874 Being able to do this is important for proper support of protoize,
1875 and also for generating precise symbolic debugging information
1876 which takes full account of the programmer's (typedef) vocabulary.
1878 Obviously, we don't want to generate a duplicate ..._TYPE node if
1879 the TYPE_DECL node that we are now processing really represents a
1880 standard built-in type.
1882 Since all standard types are effectively declared at line zero
1883 in the source file, we can easily check to see if we are working
1884 on a standard type by checking the current value of lineno. */
1887 clone_underlying_type (tree x)
1889 if (DECL_IS_BUILTIN (x))
1891 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1892 TYPE_NAME (TREE_TYPE (x)) = x;
1894 else if (TREE_TYPE (x) != error_mark_node
1895 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
1897 tree tt = TREE_TYPE (x);
1898 DECL_ORIGINAL_TYPE (x) = tt;
1899 tt = build_variant_type_copy (tt);
1901 TREE_USED (tt) = TREE_USED (x);
1906 /* Record a decl-node X as belonging to the current lexical scope.
1907 Check for errors (such as an incompatible declaration for the same
1908 name already seen in the same scope).
1910 Returns either X or an old decl for the same name.
1911 If an old decl is returned, it may have been smashed
1912 to agree with what X says. */
1917 tree name = DECL_NAME (x);
1918 struct c_scope *scope = current_scope;
1919 struct c_binding *b;
1920 bool nested = false;
1922 /* Functions need the lang_decl data. */
1923 if (TREE_CODE (x) == FUNCTION_DECL && !DECL_LANG_SPECIFIC (x))
1924 DECL_LANG_SPECIFIC (x) = GGC_CNEW (struct lang_decl);
1926 /* Must set DECL_CONTEXT for everything not at file scope or
1927 DECL_FILE_SCOPE_P won't work. Local externs don't count
1928 unless they have initializers (which generate code). */
1929 if (current_function_decl
1930 && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL)
1931 || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
1932 DECL_CONTEXT (x) = current_function_decl;
1934 /* Anonymous decls are just inserted in the scope. */
1937 bind (name, x, scope, /*invisible=*/false, /*nested=*/false);
1941 /* First, see if there is another declaration with the same name in
1942 the current scope. If there is, duplicate_decls may do all the
1943 work for us. If duplicate_decls returns false, that indicates
1944 two incompatible decls in the same scope; we are to silently
1945 replace the old one (duplicate_decls has issued all appropriate
1946 diagnostics). In particular, we should not consider possible
1947 duplicates in the external scope, or shadowing. */
1948 b = I_SYMBOL_BINDING (name);
1949 if (b && B_IN_SCOPE (b, scope))
1951 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
1952 && COMPLETE_TYPE_P (TREE_TYPE (x)))
1953 b->inner_comp = false;
1954 if (duplicate_decls (x, b->decl))
1957 goto skip_external_and_shadow_checks;
1960 /* All declarations with external linkage, and all external
1961 references, go in the external scope, no matter what scope is
1962 current. However, the binding in that scope is ignored for
1963 purposes of normal name lookup. A separate binding structure is
1964 created in the requested scope; this governs the normal
1965 visibility of the symbol.
1967 The binding in the externals scope is used exclusively for
1968 detecting duplicate declarations of the same object, no matter
1969 what scope they are in; this is what we do here. (C99 6.2.7p2:
1970 All declarations that refer to the same object or function shall
1971 have compatible type; otherwise, the behavior is undefined.) */
1972 if (DECL_EXTERNAL (x) || scope == file_scope)
1974 tree type = TREE_TYPE (x);
1977 bool type_saved = false;
1978 if (b && !B_IN_EXTERNAL_SCOPE (b)
1979 && (TREE_CODE (b->decl) == FUNCTION_DECL
1980 || TREE_CODE (b->decl) == VAR_DECL)
1981 && DECL_FILE_SCOPE_P (b->decl))
1984 vistype = TREE_TYPE (visdecl);
1986 if (warn_nested_externs
1987 && scope != file_scope
1988 && !DECL_IN_SYSTEM_HEADER (x))
1989 warning ("nested extern declaration of %qD", x);
1991 while (b && !B_IN_EXTERNAL_SCOPE (b))
1993 /* If this decl might be modified, save its type. This is
1994 done here rather than when the decl is first bound
1995 because the type may change after first binding, through
1996 being completed or through attributes being added. If we
1997 encounter multiple such decls, only the first should have
1998 its type saved; the others will already have had their
1999 proper types saved and the types will not have changed as
2000 their scopes will not have been re-entered. */
2001 if (DECL_FILE_SCOPE_P (b->decl) && !type_saved)
2003 b->type = TREE_TYPE (b->decl);
2006 if (B_IN_FILE_SCOPE (b)
2007 && TREE_CODE (b->decl) == VAR_DECL
2008 && TREE_STATIC (b->decl)
2009 && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE
2010 && !TYPE_DOMAIN (TREE_TYPE (b->decl))
2011 && TREE_CODE (type) == ARRAY_TYPE
2012 && TYPE_DOMAIN (type)
2013 && TYPE_MAX_VALUE (TYPE_DOMAIN (type))
2014 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
2016 /* Array type completed in inner scope, which should be
2017 diagnosed if the completion does not have size 1 and
2018 it does not get completed in the file scope. */
2019 b->inner_comp = true;
2024 /* If a matching external declaration has been found, set its
2025 type to the composite of all the types of that declaration.
2026 After the consistency checks, it will be reset to the
2027 composite of the visible types only. */
2028 if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2030 TREE_TYPE (b->decl) = b->type;
2032 /* The point of the same_translation_unit_p check here is,
2033 we want to detect a duplicate decl for a construct like
2034 foo() { extern bar(); } ... static bar(); but not if
2035 they are in different translation units. In any case,
2036 the static does not go in the externals scope. */
2038 && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2039 && duplicate_decls (x, b->decl))
2042 thistype = (vistype ? composite_type (vistype, type) : type);
2043 b->type = TREE_TYPE (b->decl);
2044 if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl))
2046 = build_type_attribute_variant (thistype,
2047 TYPE_ATTRIBUTES (b->type));
2048 TREE_TYPE (b->decl) = thistype;
2049 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true);
2052 else if (TREE_PUBLIC (x))
2054 if (visdecl && !b && duplicate_decls (x, visdecl))
2056 /* An external declaration at block scope referring to a
2057 visible entity with internal linkage. The composite
2058 type will already be correct for this scope, so we
2059 just need to fall through to make the declaration in
2066 bind (name, x, external_scope, /*invisible=*/true,
2072 /* Similarly, a declaration of a function with static linkage at
2073 block scope must be checked against any existing declaration
2074 of that function at file scope. */
2075 else if (TREE_CODE (x) == FUNCTION_DECL && scope != file_scope
2076 && !TREE_PUBLIC (x) && !DECL_INITIAL (x))
2078 if (warn_nested_externs && !DECL_IN_SYSTEM_HEADER (x))
2079 warning ("nested static declaration of %qD", x);
2081 while (b && !B_IN_FILE_SCOPE (b))
2084 if (b && same_translation_unit_p (x, b->decl)
2085 && duplicate_decls (x, b->decl))
2087 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true);
2092 bind (name, x, file_scope, /*invisible=*/true, /*nested=*/false);
2097 warn_if_shadowing (x);
2099 skip_external_and_shadow_checks:
2100 if (TREE_CODE (x) == TYPE_DECL)
2101 clone_underlying_type (x);
2103 bind (name, x, scope, /*invisible=*/false, nested);
2105 /* If x's type is incomplete because it's based on a
2106 structure or union which has not yet been fully declared,
2107 attach it to that structure or union type, so we can go
2108 back and complete the variable declaration later, if the
2109 structure or union gets fully declared.
2111 If the input is erroneous, we can have error_mark in the type
2112 slot (e.g. "f(void a, ...)") - that doesn't count as an
2114 if (TREE_TYPE (x) != error_mark_node
2115 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2117 tree element = TREE_TYPE (x);
2119 while (TREE_CODE (element) == ARRAY_TYPE)
2120 element = TREE_TYPE (element);
2121 element = TYPE_MAIN_VARIANT (element);
2123 if ((TREE_CODE (element) == RECORD_TYPE
2124 || TREE_CODE (element) == UNION_TYPE)
2125 && (TREE_CODE (x) != TYPE_DECL
2126 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
2127 && !COMPLETE_TYPE_P (element))
2128 C_TYPE_INCOMPLETE_VARS (element)
2129 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
2134 /* Record X as belonging to file scope.
2135 This is used only internally by the Objective-C front end,
2136 and is limited to its needs. duplicate_decls is not called;
2137 if there is any preexisting decl for this identifier, it is an ICE. */
2140 pushdecl_top_level (tree x)
2143 bool nested = false;
2144 gcc_assert (TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == CONST_DECL);
2146 name = DECL_NAME (x);
2148 gcc_assert (TREE_CODE (x) == CONST_DECL || !I_SYMBOL_BINDING (name));
2150 if (TREE_PUBLIC (x))
2152 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false);
2156 bind (name, x, file_scope, /*invisible=*/false, nested);
2162 implicit_decl_warning (tree id, tree olddecl)
2164 void (*diag) (const char *, ...);
2165 switch (mesg_implicit_function_declaration)
2168 case 1: diag = warning; break;
2169 case 2: diag = error; break;
2170 default: gcc_unreachable ();
2173 diag (N_("implicit declaration of function %qE"), id);
2175 locate_old_decl (olddecl, diag);
2178 /* Generate an implicit declaration for identifier FUNCTIONID as a
2179 function of type int (). */
2182 implicitly_declare (tree functionid)
2184 struct c_binding *b;
2188 for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed)
2190 if (B_IN_SCOPE (b, external_scope))
2199 /* FIXME: Objective-C has weird not-really-builtin functions
2200 which are supposed to be visible automatically. They wind up
2201 in the external scope because they're pushed before the file
2202 scope gets created. Catch this here and rebind them into the
2204 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
2206 bind (functionid, decl, file_scope,
2207 /*invisible=*/false, /*nested=*/true);
2212 tree newtype = default_function_type;
2214 TREE_TYPE (decl) = b->type;
2215 /* Implicit declaration of a function already declared
2216 (somehow) in a different scope, or as a built-in.
2217 If this is the first time this has happened, warn;
2218 then recycle the old declaration but with the new type. */
2219 if (!C_DECL_IMPLICIT (decl))
2221 implicit_decl_warning (functionid, decl);
2222 C_DECL_IMPLICIT (decl) = 1;
2224 if (DECL_BUILT_IN (decl))
2226 newtype = build_type_attribute_variant (newtype,
2228 (TREE_TYPE (decl)));
2229 if (!comptypes (newtype, TREE_TYPE (decl)))
2231 warning ("incompatible implicit declaration of built-in"
2232 " function %qD", decl);
2233 newtype = TREE_TYPE (decl);
2238 if (!comptypes (newtype, TREE_TYPE (decl)))
2240 error ("incompatible implicit declaration of function %qD",
2242 locate_old_decl (decl, error);
2245 b->type = TREE_TYPE (decl);
2246 TREE_TYPE (decl) = newtype;
2247 bind (functionid, decl, current_scope,
2248 /*invisible=*/false, /*nested=*/true);
2253 /* Not seen before. */
2254 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2255 DECL_EXTERNAL (decl) = 1;
2256 TREE_PUBLIC (decl) = 1;
2257 C_DECL_IMPLICIT (decl) = 1;
2258 implicit_decl_warning (functionid, 0);
2259 asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL);
2261 set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree));
2263 /* C89 says implicit declarations are in the innermost block.
2264 So we record the decl in the standard fashion. */
2265 decl = pushdecl (decl);
2267 /* No need to call objc_check_decl here - it's a function type. */
2268 rest_of_decl_compilation (decl, 0, 0);
2270 /* Write a record describing this implicit function declaration
2271 to the prototypes file (if requested). */
2272 gen_aux_info_record (decl, 0, 1, 0);
2274 /* Possibly apply some default attributes to this implicit declaration. */
2275 decl_attributes (&decl, NULL_TREE, 0);
2280 /* Issue an error message for a reference to an undeclared variable
2281 ID, including a reference to a builtin outside of function-call
2282 context. Establish a binding of the identifier to error_mark_node
2283 in an appropriate scope, which will suppress further errors for the
2286 undeclared_variable (tree id)
2288 static bool already = false;
2289 struct c_scope *scope;
2291 if (current_function_decl == 0)
2293 error ("%qE undeclared here (not in a function)", id);
2294 scope = current_scope;
2298 error ("%qE undeclared (first use in this function)", id);
2302 error ("(Each undeclared identifier is reported only once");
2303 error ("for each function it appears in.)");
2307 /* If we are parsing old-style parameter decls, current_function_decl
2308 will be nonnull but current_function_scope will be null. */
2309 scope = current_function_scope ? current_function_scope : current_scope;
2311 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false);
2314 /* Subroutine of lookup_label, declare_label, define_label: construct a
2315 LABEL_DECL with all the proper frills. */
2318 make_label (tree name, location_t location)
2320 tree label = build_decl (LABEL_DECL, name, void_type_node);
2322 DECL_CONTEXT (label) = current_function_decl;
2323 DECL_MODE (label) = VOIDmode;
2324 DECL_SOURCE_LOCATION (label) = location;
2329 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
2330 Create one if none exists so far for the current function.
2331 This is called when a label is used in a goto expression or
2332 has its address taken. */
2335 lookup_label (tree name)
2339 if (current_function_decl == 0)
2341 error ("label %qs referenced outside of any function",
2342 IDENTIFIER_POINTER (name));
2346 /* Use a label already defined or ref'd with this name, but not if
2347 it is inherited from a containing function and wasn't declared
2349 label = I_LABEL_DECL (name);
2350 if (label && (DECL_CONTEXT (label) == current_function_decl
2351 || C_DECLARED_LABEL_FLAG (label)))
2353 /* If the label has only been declared, update its apparent
2354 location to point here, for better diagnostics if it
2355 turns out not to have been defined. */
2356 if (!TREE_USED (label))
2357 DECL_SOURCE_LOCATION (label) = input_location;
2361 /* No label binding for that identifier; make one. */
2362 label = make_label (name, input_location);
2364 /* Ordinary labels go in the current function scope. */
2365 bind (name, label, current_function_scope,
2366 /*invisible=*/false, /*nested=*/false);
2370 /* Make a label named NAME in the current function, shadowing silently
2371 any that may be inherited from containing functions or containing
2372 scopes. This is called for __label__ declarations. */
2375 declare_label (tree name)
2377 struct c_binding *b = I_LABEL_BINDING (name);
2380 /* Check to make sure that the label hasn't already been declared
2382 if (b && B_IN_CURRENT_SCOPE (b))
2384 error ("duplicate label declaration %qs", IDENTIFIER_POINTER (name));
2385 locate_old_decl (b->decl, error);
2387 /* Just use the previous declaration. */
2391 label = make_label (name, input_location);
2392 C_DECLARED_LABEL_FLAG (label) = 1;
2394 /* Declared labels go in the current scope. */
2395 bind (name, label, current_scope,
2396 /*invisible=*/false, /*nested=*/false);
2400 /* Define a label, specifying the location in the source file.
2401 Return the LABEL_DECL node for the label, if the definition is valid.
2402 Otherwise return 0. */
2405 define_label (location_t location, tree name)
2407 /* Find any preexisting label with this name. It is an error
2408 if that label has already been defined in this function, or
2409 if there is a containing function with a declared label with
2411 tree label = I_LABEL_DECL (name);
2414 && ((DECL_CONTEXT (label) == current_function_decl
2415 && DECL_INITIAL (label) != 0)
2416 || (DECL_CONTEXT (label) != current_function_decl
2417 && C_DECLARED_LABEL_FLAG (label))))
2419 error ("%Hduplicate label %qD", &location, label);
2420 locate_old_decl (label, error);
2423 else if (label && DECL_CONTEXT (label) == current_function_decl)
2425 /* The label has been used or declared already in this function,
2426 but not defined. Update its location to point to this
2428 DECL_SOURCE_LOCATION (label) = location;
2432 /* No label binding for that identifier; make one. */
2433 label = make_label (name, location);
2435 /* Ordinary labels go in the current function scope. */
2436 bind (name, label, current_function_scope,
2437 /*invisible=*/false, /*nested=*/false);
2440 if (warn_traditional && !in_system_header && lookup_name (name))
2441 warning ("%Htraditional C lacks a separate namespace for labels, "
2442 "identifier %qs conflicts", &location,
2443 IDENTIFIER_POINTER (name));
2445 /* Mark label as having been defined. */
2446 DECL_INITIAL (label) = error_mark_node;
2450 /* Given NAME, an IDENTIFIER_NODE,
2451 return the structure (or union or enum) definition for that name.
2452 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2453 CODE says which kind of type the caller wants;
2454 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2455 If the wrong kind of type is found, an error is reported. */
2458 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2460 struct c_binding *b = I_TAG_BINDING (name);
2466 /* We only care about whether it's in this level if
2467 thislevel_only was set or it might be a type clash. */
2468 if (thislevel_only || TREE_CODE (b->decl) != code)
2470 /* For our purposes, a tag in the external scope is the same as
2471 a tag in the file scope. (Primarily relevant to Objective-C
2472 and its builtin structure tags, which get pushed before the
2473 file scope is created.) */
2474 if (B_IN_CURRENT_SCOPE (b)
2475 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
2479 if (thislevel_only && !thislevel)
2482 if (TREE_CODE (b->decl) != code)
2484 /* Definition isn't the kind we were looking for. */
2485 pending_invalid_xref = name;
2486 pending_invalid_xref_location = input_location;
2488 /* If in the same binding level as a declaration as a tag
2489 of a different type, this must not be allowed to
2490 shadow that tag, so give the error immediately.
2491 (For example, "struct foo; union foo;" is invalid.) */
2493 pending_xref_error ();
2498 /* Print an error message now
2499 for a recent invalid struct, union or enum cross reference.
2500 We don't print them immediately because they are not invalid
2501 when used in the `struct foo;' construct for shadowing. */
2504 pending_xref_error (void)
2506 if (pending_invalid_xref != 0)
2507 error ("%H%qs defined as wrong kind of tag",
2508 &pending_invalid_xref_location,
2509 IDENTIFIER_POINTER (pending_invalid_xref));
2510 pending_invalid_xref = 0;
2514 /* Look up NAME in the current scope and its superiors
2515 in the namespace of variables, functions and typedefs.
2516 Return a ..._DECL node of some kind representing its definition,
2517 or return 0 if it is undefined. */
2520 lookup_name (tree name)
2522 struct c_binding *b = I_SYMBOL_BINDING (name);
2523 if (b && !b->invisible)
2528 /* Similar to `lookup_name' but look only at the indicated scope. */
2531 lookup_name_in_scope (tree name, struct c_scope *scope)
2533 struct c_binding *b;
2535 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
2536 if (B_IN_SCOPE (b, scope))
2541 /* Create the predefined scalar types of C,
2542 and some nodes representing standard constants (0, 1, (void *) 0).
2543 Initialize the global scope.
2544 Make definitions for built-in primitive functions. */
2547 c_init_decl_processing (void)
2550 tree ptr_ftype_void, ptr_ftype_ptr;
2551 location_t save_loc = input_location;
2553 /* Adds some ggc roots, and reserved words for c-parse.in. */
2556 current_function_decl = 0;
2558 gcc_obstack_init (&parser_obstack);
2560 /* Make the externals scope. */
2562 external_scope = current_scope;
2564 /* Declarations from c_common_nodes_and_builtins must not be associated
2565 with this input file, lest we get differences between using and not
2566 using preprocessed headers. */
2567 #ifdef USE_MAPPED_LOCATION
2568 input_location = BUILTINS_LOCATION;
2570 input_location.file = "<built-in>";
2571 input_location.line = 0;
2574 build_common_tree_nodes (flag_signed_char, false);
2576 c_common_nodes_and_builtins ();
2578 /* In C, comparisons and TRUTH_* expressions have type int. */
2579 truthvalue_type_node = integer_type_node;
2580 truthvalue_true_node = integer_one_node;
2581 truthvalue_false_node = integer_zero_node;
2583 /* Even in C99, which has a real boolean type. */
2584 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2585 boolean_type_node));
2587 endlink = void_list_node;
2588 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
2590 = build_function_type (ptr_type_node,
2591 tree_cons (NULL_TREE, ptr_type_node, endlink));
2593 input_location = save_loc;
2595 pedantic_lvalues = true;
2597 make_fname_decl = c_make_fname_decl;
2598 start_fname_decls ();
2601 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2602 decl, NAME is the initialization string and TYPE_DEP indicates whether
2603 NAME depended on the type of the function. As we don't yet implement
2604 delayed emission of static data, we mark the decl as emitted
2605 so it is not placed in the output. Anything using it must therefore pull
2606 out the STRING_CST initializer directly. FIXME. */
2609 c_make_fname_decl (tree id, int type_dep)
2611 const char *name = fname_as_string (type_dep);
2612 tree decl, type, init;
2613 size_t length = strlen (name);
2615 type = build_array_type
2616 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
2617 build_index_type (size_int (length)));
2619 decl = build_decl (VAR_DECL, id, type);
2621 TREE_STATIC (decl) = 1;
2622 TREE_READONLY (decl) = 1;
2623 DECL_ARTIFICIAL (decl) = 1;
2625 init = build_string (length + 1, name);
2626 free ((char *) name);
2627 TREE_TYPE (init) = type;
2628 DECL_INITIAL (decl) = init;
2630 TREE_USED (decl) = 1;
2632 if (current_function_decl)
2634 DECL_CONTEXT (decl) = current_function_decl;
2635 bind (id, decl, current_function_scope,
2636 /*invisible=*/false, /*nested=*/false);
2639 finish_decl (decl, init, NULL_TREE);
2644 /* Return a definition for a builtin function named NAME and whose data type
2645 is TYPE. TYPE should be a function type with argument types.
2646 FUNCTION_CODE tells later passes how to compile calls to this function.
2647 See tree.h for its possible values.
2649 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2650 the name to be called if we can't opencode the function. If
2651 ATTRS is nonzero, use that for the function's attribute list. */
2654 builtin_function (const char *name, tree type, int function_code,
2655 enum built_in_class cl, const char *library_name,
2658 tree id = get_identifier (name);
2659 tree decl = build_decl (FUNCTION_DECL, id, type);
2660 TREE_PUBLIC (decl) = 1;
2661 DECL_EXTERNAL (decl) = 1;
2662 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
2663 DECL_BUILT_IN_CLASS (decl) = cl;
2664 DECL_FUNCTION_CODE (decl) = function_code;
2666 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2668 /* Should never be called on a symbol with a preexisting meaning. */
2669 gcc_assert (!I_SYMBOL_BINDING (id));
2671 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false);
2673 /* Builtins in the implementation namespace are made visible without
2674 needing to be explicitly declared. See push_file_scope. */
2675 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
2677 TREE_CHAIN (decl) = visible_builtins;
2678 visible_builtins = decl;
2681 /* Possibly apply some default attributes to this built-in function. */
2683 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2685 decl_attributes (&decl, NULL_TREE, 0);
2690 /* Called when a declaration is seen that contains no names to declare.
2691 If its type is a reference to a structure, union or enum inherited
2692 from a containing scope, shadow that tag name for the current scope
2693 with a forward reference.
2694 If its type defines a new named structure or union
2695 or defines an enum, it is valid but we need not do anything here.
2696 Otherwise, it is an error. */
2699 shadow_tag (const struct c_declspecs *declspecs)
2701 shadow_tag_warned (declspecs, 0);
2704 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
2707 shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
2709 bool found_tag = false;
2711 if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p)
2713 tree value = declspecs->type;
2714 enum tree_code code = TREE_CODE (value);
2716 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2717 /* Used to test also that TYPE_SIZE (value) != 0.
2718 That caused warning for `struct foo;' at top level in the file. */
2720 tree name = TYPE_NAME (value);
2727 if (warned != 1 && code != ENUMERAL_TYPE)
2728 /* Empty unnamed enum OK */
2730 pedwarn ("unnamed struct/union that defines no instances");
2734 else if (!declspecs->tag_defined_p
2735 && declspecs->storage_class != csc_none)
2738 pedwarn ("empty declaration with storage class specifier "
2739 "does not redeclare tag");
2741 pending_xref_error ();
2743 else if (!declspecs->tag_defined_p
2744 && (declspecs->const_p
2745 || declspecs->volatile_p
2746 || declspecs->restrict_p))
2749 pedwarn ("empty declaration with type qualifier "
2750 "does not redeclare tag");
2752 pending_xref_error ();
2756 pending_invalid_xref = 0;
2757 t = lookup_tag (code, name, 1);
2761 t = make_node (code);
2768 if (warned != 1 && !in_system_header)
2770 pedwarn ("useless type name in empty declaration");
2775 else if (warned != 1 && !in_system_header && declspecs->typedef_p)
2777 pedwarn ("useless type name in empty declaration");
2781 pending_invalid_xref = 0;
2783 if (declspecs->inline_p)
2785 error ("%<inline%> in empty declaration");
2789 if (current_scope == file_scope && declspecs->storage_class == csc_auto)
2791 error ("%<auto%> in file-scope empty declaration");
2795 if (current_scope == file_scope && declspecs->storage_class == csc_register)
2797 error ("%<register%> in file-scope empty declaration");
2801 if (!warned && !in_system_header && declspecs->storage_class != csc_none)
2803 warning ("useless storage class specifier in empty declaration");
2807 if (!warned && !in_system_header && declspecs->thread_p)
2809 warning ("useless %<__thread%> in empty declaration");
2813 if (!warned && !in_system_header && (declspecs->const_p
2814 || declspecs->volatile_p
2815 || declspecs->restrict_p))
2817 warning ("useless type qualifier in empty declaration");
2824 pedwarn ("empty declaration");
2829 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
2830 bits. SPECS represents declaration specifiers that the grammar
2831 only permits to contain type qualifiers and attributes. */
2834 quals_from_declspecs (const struct c_declspecs *specs)
2836 int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0)
2837 | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0)
2838 | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0));
2839 gcc_assert (!specs->type
2840 && !specs->decl_attr
2841 && specs->typespec_word == cts_none
2842 && specs->storage_class == csc_none
2843 && !specs->typedef_p
2844 && !specs->explicit_signed_p
2845 && !specs->deprecated_p
2847 && !specs->long_long_p
2850 && !specs->unsigned_p
2851 && !specs->complex_p
2853 && !specs->thread_p);
2857 /* Construct an array declarator. EXPR is the expression inside [], or
2858 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2859 to the pointer to which a parameter array is converted). STATIC_P is
2860 true if "static" is inside the [], false otherwise. VLA_UNSPEC_P
2861 is true if the array is [*], a VLA of unspecified length which is
2862 nevertheless a complete type (not currently implemented by GCC),
2863 false otherwise. The field for the contained declarator is left to be
2864 filled in by set_array_declarator_inner. */
2866 struct c_declarator *
2867 build_array_declarator (tree expr, struct c_declspecs *quals, bool static_p,
2870 struct c_declarator *declarator = XOBNEW (&parser_obstack,
2871 struct c_declarator);
2872 declarator->kind = cdk_array;
2873 declarator->declarator = 0;
2874 declarator->u.array.dimen = expr;
2877 declarator->u.array.attrs = quals->attrs;
2878 declarator->u.array.quals = quals_from_declspecs (quals);
2882 declarator->u.array.attrs = NULL_TREE;
2883 declarator->u.array.quals = 0;
2885 declarator->u.array.static_p = static_p;
2886 declarator->u.array.vla_unspec_p = vla_unspec_p;
2887 if (pedantic && !flag_isoc99)
2889 if (static_p || quals != NULL)
2890 pedwarn ("ISO C90 does not support %<static%> or type "
2891 "qualifiers in parameter array declarators");
2893 pedwarn ("ISO C90 does not support %<[*]%> array declarators");
2896 warning ("GCC does not yet properly implement %<[*]%> array declarators");
2900 /* Set the contained declarator of an array declarator. DECL is the
2901 declarator, as constructed by build_array_declarator; INNER is what
2902 appears on the left of the []. ABSTRACT_P is true if it is an
2903 abstract declarator, false otherwise; this is used to reject static
2904 and type qualifiers in abstract declarators, where they are not in
2905 the C99 grammar (subject to possible change in DR#289). */
2907 struct c_declarator *
2908 set_array_declarator_inner (struct c_declarator *decl,
2909 struct c_declarator *inner, bool abstract_p)
2911 decl->declarator = inner;
2912 if (abstract_p && (decl->u.array.quals != TYPE_UNQUALIFIED
2913 || decl->u.array.attrs != NULL_TREE
2914 || decl->u.array.static_p))
2915 error ("static or type qualifiers in abstract declarator");
2919 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2922 groktypename (struct c_type_name *type_name)
2925 tree attrs = type_name->specs->attrs;
2927 type_name->specs->attrs = NULL_TREE;
2929 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
2932 /* Apply attributes. */
2933 decl_attributes (&type, attrs, 0);
2938 /* Decode a declarator in an ordinary declaration or data definition.
2939 This is called as soon as the type information and variable name
2940 have been parsed, before parsing the initializer if any.
2941 Here we create the ..._DECL node, fill in its type,
2942 and put it on the list of decls for the current context.
2943 The ..._DECL node is returned as the value.
2945 Exception: for arrays where the length is not specified,
2946 the type is left null, to be filled in by `finish_decl'.
2948 Function definitions do not come here; they go to start_function
2949 instead. However, external and forward declarations of functions
2950 do go through here. Structure field declarations are done by
2951 grokfield and not through here. */
2954 start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
2955 bool initialized, tree attributes)
2960 /* An object declared as __attribute__((deprecated)) suppresses
2961 warnings of uses of other deprecated items. */
2962 if (lookup_attribute ("deprecated", attributes))
2963 deprecated_state = DEPRECATED_SUPPRESS;
2965 decl = grokdeclarator (declarator, declspecs,
2966 NORMAL, initialized, NULL);
2970 deprecated_state = DEPRECATED_NORMAL;
2972 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
2973 && MAIN_NAME_P (DECL_NAME (decl)))
2974 warning ("%J%qD is usually a function", decl, decl);
2977 /* Is it valid for this decl to have an initializer at all?
2978 If not, set INITIALIZED to zero, which will indirectly
2979 tell 'finish_decl' to ignore the initializer once it is parsed. */
2980 switch (TREE_CODE (decl))
2983 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
2988 error ("function %qD is initialized like a variable", decl);
2993 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
2994 error ("parameter %qD is initialized", decl);
2999 /* Don't allow initializations for incomplete types except for
3000 arrays which might be completed by the initialization. */
3002 /* This can happen if the array size is an undefined macro.
3003 We already gave a warning, so we don't need another one. */
3004 if (TREE_TYPE (decl) == error_mark_node)
3006 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3008 /* A complete type is ok if size is fixed. */
3010 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3011 || C_DECL_VARIABLE_SIZE (decl))
3013 error ("variable-sized object may not be initialized");
3017 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3019 error ("variable %qD has initializer but incomplete type", decl);
3022 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3024 error ("elements of array %qD have incomplete type", decl);
3027 else if (C_DECL_VARIABLE_SIZE (decl))
3029 /* Although C99 is unclear about whether incomplete arrays
3030 of VLAs themselves count as VLAs, it does not make
3031 sense to permit them to be initialized given that
3032 ordinary VLAs may not be initialized. */
3033 error ("variable-sized object may not be initialized");
3040 if (current_scope == file_scope)
3041 TREE_STATIC (decl) = 1;
3043 /* Tell 'pushdecl' this is an initialized decl
3044 even though we don't yet have the initializer expression.
3045 Also tell 'finish_decl' it may store the real initializer. */
3046 DECL_INITIAL (decl) = error_mark_node;
3049 /* If this is a function declaration, write a record describing it to the
3050 prototypes file (if requested). */
3052 if (TREE_CODE (decl) == FUNCTION_DECL)
3053 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3055 /* ANSI specifies that a tentative definition which is not merged with
3056 a non-tentative definition behaves exactly like a definition with an
3057 initializer equal to zero. (Section 3.7.2)
3059 -fno-common gives strict ANSI behavior, though this tends to break
3060 a large body of code that grew up without this rule.
3062 Thread-local variables are never common, since there's no entrenched
3063 body of code to break, and it allows more efficient variable references
3064 in the presence of dynamic linking. */
3066 if (TREE_CODE (decl) == VAR_DECL
3068 && TREE_PUBLIC (decl)
3069 && !DECL_THREAD_LOCAL (decl)
3071 DECL_COMMON (decl) = 1;
3073 /* Set attributes here so if duplicate decl, will have proper attributes. */
3074 decl_attributes (&decl, attributes, 0);
3076 if (TREE_CODE (decl) == FUNCTION_DECL
3077 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
3079 struct c_declarator *ce = declarator;
3081 if (ce->kind == cdk_pointer)
3082 ce = declarator->declarator;
3083 if (ce->kind == cdk_function)
3085 tree args = ce->u.arg_info->parms;
3086 for (; args; args = TREE_CHAIN (args))
3088 tree type = TREE_TYPE (args);
3089 if (type && INTEGRAL_TYPE_P (type)
3090 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
3091 DECL_ARG_TYPE (args) = integer_type_node;
3096 if (TREE_CODE (decl) == FUNCTION_DECL
3097 && DECL_DECLARED_INLINE_P (decl)
3098 && DECL_UNINLINABLE (decl)
3099 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3100 warning ("%Jinline function %qD given attribute noinline", decl, decl);
3102 /* Add this decl to the current scope.
3103 TEM may equal DECL or it may be a previous decl of the same name. */
3104 tem = pushdecl (decl);
3106 if (initialized && DECL_EXTERNAL (tem))
3108 DECL_EXTERNAL (tem) = 0;
3109 TREE_STATIC (tem) = 1;
3115 /* Finish processing of a declaration;
3116 install its initial value.
3117 If the length of an array type is not known before,
3118 it must be determined now, from the initial value, or it is an error. */
3121 finish_decl (tree decl, tree init, tree asmspec_tree)
3123 tree type = TREE_TYPE (decl);
3124 int was_incomplete = (DECL_SIZE (decl) == 0);
3125 const char *asmspec = 0;
3127 /* If a name was specified, get the string. */
3128 if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
3129 && DECL_FILE_SCOPE_P (decl))
3130 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
3132 asmspec = TREE_STRING_POINTER (asmspec_tree);
3134 /* If `start_decl' didn't like having an initialization, ignore it now. */
3135 if (init != 0 && DECL_INITIAL (decl) == 0)
3138 /* Don't crash if parm is initialized. */
3139 if (TREE_CODE (decl) == PARM_DECL)
3143 store_init_value (decl, init);
3145 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
3146 || TREE_CODE (decl) == FUNCTION_DECL
3147 || TREE_CODE (decl) == FIELD_DECL))
3148 objc_check_decl (decl);
3150 /* Deduce size of array from initialization, if not already known. */
3151 if (TREE_CODE (type) == ARRAY_TYPE
3152 && TYPE_DOMAIN (type) == 0
3153 && TREE_CODE (decl) != TYPE_DECL)
3156 = (TREE_STATIC (decl)
3157 /* Even if pedantic, an external linkage array
3158 may have incomplete type at first. */
3159 ? pedantic && !TREE_PUBLIC (decl)
3160 : !DECL_EXTERNAL (decl));
3162 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3164 /* Get the completed type made by complete_array_type. */
3165 type = TREE_TYPE (decl);
3168 error ("%Jinitializer fails to determine size of %qD", decl, decl);
3170 else if (failure == 2)
3173 error ("%Jarray size missing in %qD", decl, decl);
3174 /* If a `static' var's size isn't known,
3175 make it extern as well as static, so it does not get
3177 If it is not `static', then do not mark extern;
3178 finish_incomplete_decl will give it a default size
3179 and it will get allocated. */
3180 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
3181 DECL_EXTERNAL (decl) = 1;
3184 /* TYPE_MAX_VALUE is always one less than the number of elements
3185 in the array, because we start counting at zero. Therefore,
3186 warn only if the value is less than zero. */
3187 else if (pedantic && TYPE_DOMAIN (type) != 0
3188 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3189 error ("%Jzero or negative size array %qD", decl, decl);
3191 layout_decl (decl, 0);
3194 if (TREE_CODE (decl) == VAR_DECL)
3196 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3197 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3198 layout_decl (decl, 0);
3200 if (DECL_SIZE (decl) == 0
3201 /* Don't give an error if we already gave one earlier. */
3202 && TREE_TYPE (decl) != error_mark_node
3203 && (TREE_STATIC (decl)
3204 /* A static variable with an incomplete type
3205 is an error if it is initialized.
3206 Also if it is not file scope.
3207 Otherwise, let it through, but if it is not `extern'
3208 then it may cause an error message later. */
3209 ? (DECL_INITIAL (decl) != 0
3210 || !DECL_FILE_SCOPE_P (decl))
3211 /* An automatic variable with an incomplete type
3213 : !DECL_EXTERNAL (decl)))
3215 error ("%Jstorage size of %qD isn%'t known", decl, decl);
3216 TREE_TYPE (decl) = error_mark_node;
3219 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3220 && DECL_SIZE (decl) != 0)
3222 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3223 constant_expression_warning (DECL_SIZE (decl));
3225 error ("%Jstorage size of %qD isn%'t constant", decl, decl);
3228 if (TREE_USED (type))
3229 TREE_USED (decl) = 1;
3232 /* If this is a function and an assembler name is specified, reset DECL_RTL
3233 so we can give it its new name. Also, update built_in_decls if it
3234 was a normal built-in. */
3235 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3237 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
3238 set_builtin_user_assembler_name (decl, asmspec);
3239 set_user_assembler_name (decl, asmspec);
3242 /* If #pragma weak was used, mark the decl weak now. */
3243 if (current_scope == file_scope)
3244 maybe_apply_pragma_weak (decl);
3246 /* If this is a variable definition, determine its ELF visibility. */
3247 if (TREE_CODE (decl) == VAR_DECL
3248 && TREE_STATIC (decl)
3249 && !DECL_EXTERNAL (decl))
3250 c_determine_visibility (decl);
3252 /* Output the assembler code and/or RTL code for variables and functions,
3253 unless the type is an undefined structure or union.
3254 If not, it will get done when the type is completed. */
3256 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3258 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3259 if (c_dialect_objc ())
3260 objc_check_decl (decl);
3264 /* If this is not a static variable, issue a warning.
3265 It doesn't make any sense to give an ASMSPEC for an
3266 ordinary, non-register local variable. Historically,
3267 GCC has accepted -- but ignored -- the ASMSPEC in
3269 if (!DECL_FILE_SCOPE_P (decl)
3270 && TREE_CODE (decl) == VAR_DECL
3271 && !C_DECL_REGISTER (decl)
3272 && !TREE_STATIC (decl))
3273 warning ("%Jignoring asm-specifier for non-static local "
3274 "variable %qD", decl, decl);
3275 else if (C_DECL_REGISTER (decl))
3276 change_decl_assembler_name (decl, get_identifier (asmspec));
3278 set_user_assembler_name (decl, asmspec);
3281 if (DECL_FILE_SCOPE_P (decl))
3283 if (DECL_INITIAL (decl) == NULL_TREE
3284 || DECL_INITIAL (decl) == error_mark_node)
3285 /* Don't output anything
3286 when a tentative file-scope definition is seen.
3287 But at end of compilation, do output code for them. */
3288 DECL_DEFER_OUTPUT (decl) = 1;
3289 rest_of_decl_compilation (decl, true, 0);
3293 /* In conjunction with an ASMSPEC, the `register'
3294 keyword indicates that we should place the variable
3295 in a particular register. */
3296 if (asmspec && C_DECL_REGISTER (decl))
3298 DECL_HARD_REGISTER (decl) = 1;
3299 /* This cannot be done for a structure with volatile
3300 fields, on which DECL_REGISTER will have been
3302 if (!DECL_REGISTER (decl))
3303 error ("cannot put object with volatile field into register");
3306 if (TREE_CODE (decl) != FUNCTION_DECL)
3308 /* If we're building a variable sized type, and we might be
3309 reachable other than via the top of the current binding
3310 level, then create a new BIND_EXPR so that we deallocate
3311 the object at the right time. */
3312 /* Note that DECL_SIZE can be null due to errors. */
3313 if (DECL_SIZE (decl)
3314 && !TREE_CONSTANT (DECL_SIZE (decl))
3315 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
3318 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
3319 TREE_SIDE_EFFECTS (bind) = 1;
3321 BIND_EXPR_BODY (bind) = push_stmt_list ();
3323 add_stmt (build_stmt (DECL_EXPR, decl));
3328 if (!DECL_FILE_SCOPE_P (decl))
3330 /* Recompute the RTL of a local array now
3331 if it used to be an incomplete type. */
3333 && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
3335 /* If we used it already as memory, it must stay in memory. */
3336 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3337 /* If it's still incomplete now, no init will save it. */
3338 if (DECL_SIZE (decl) == 0)
3339 DECL_INITIAL (decl) = 0;
3344 /* If this was marked 'used', be sure it will be output. */
3345 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
3346 mark_decl_referenced (decl);
3348 if (TREE_CODE (decl) == TYPE_DECL)
3350 if (!DECL_FILE_SCOPE_P (decl)
3351 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3352 add_stmt (build_stmt (DECL_EXPR, decl));
3354 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
3357 /* At the end of a declaration, throw away any variable type sizes
3358 of types defined inside that declaration. There is no use
3359 computing them in the following function definition. */
3360 if (current_scope == file_scope)
3361 get_pending_sizes ();
3363 /* Install a cleanup (aka destructor) if one was given. */
3364 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
3366 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
3369 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
3370 tree cleanup_decl = lookup_name (cleanup_id);
3373 /* Build "cleanup(&decl)" for the destructor. */
3374 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
3375 cleanup = build_tree_list (NULL_TREE, cleanup);
3376 cleanup = build_function_call (cleanup_decl, cleanup);
3378 /* Don't warn about decl unused; the cleanup uses it. */
3379 TREE_USED (decl) = 1;
3380 TREE_USED (cleanup_decl) = 1;
3382 /* Initialize EH, if we've been told to do so. */
3383 if (flag_exceptions && !c_eh_initialized_p)
3385 c_eh_initialized_p = true;
3386 eh_personality_libfunc
3387 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3388 ? "__gcc_personality_sj0"
3389 : "__gcc_personality_v0");
3390 using_eh_for_cleanups ();
3393 push_cleanup (decl, cleanup, false);
3398 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
3401 grokparm (const struct c_parm *parm)
3403 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
3406 decl_attributes (&decl, parm->attrs, 0);
3411 /* Given a parsed parameter declaration, decode it into a PARM_DECL
3412 and push that on the current scope. */
3415 push_parm_decl (const struct c_parm *parm)
3419 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL);
3420 decl_attributes (&decl, parm->attrs, 0);
3422 decl = pushdecl (decl);
3424 finish_decl (decl, NULL_TREE, NULL_TREE);
3427 /* Mark all the parameter declarations to date as forward decls.
3428 Also diagnose use of this extension. */
3431 mark_forward_parm_decls (void)
3433 struct c_binding *b;
3435 if (pedantic && !current_scope->warned_forward_parm_decls)
3437 pedwarn ("ISO C forbids forward parameter declarations");
3438 current_scope->warned_forward_parm_decls = true;
3441 for (b = current_scope->bindings; b; b = b->prev)
3442 if (TREE_CODE (b->decl) == PARM_DECL)
3443 TREE_ASM_WRITTEN (b->decl) = 1;
3446 static GTY(()) int compound_literal_number;
3448 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3449 literal, which may be an incomplete array type completed by the
3450 initializer; INIT is a CONSTRUCTOR that initializes the compound
3454 build_compound_literal (tree type, tree init)
3456 /* We do not use start_decl here because we have a type, not a declarator;
3457 and do not use finish_decl because the decl should be stored inside
3458 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
3463 if (type == error_mark_node)
3464 return error_mark_node;
3466 decl = build_decl (VAR_DECL, NULL_TREE, type);
3467 DECL_EXTERNAL (decl) = 0;
3468 TREE_PUBLIC (decl) = 0;
3469 TREE_STATIC (decl) = (current_scope == file_scope);
3470 DECL_CONTEXT (decl) = current_function_decl;
3471 TREE_USED (decl) = 1;
3472 TREE_TYPE (decl) = type;
3473 TREE_READONLY (decl) = TYPE_READONLY (type);
3474 store_init_value (decl, init);
3476 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3478 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3480 gcc_assert (!failure);
3483 type = TREE_TYPE (decl);
3484 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3485 return error_mark_node;
3487 stmt = build_stmt (DECL_EXPR, decl);
3488 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3489 TREE_SIDE_EFFECTS (complit) = 1;
3491 layout_decl (decl, 0);
3493 if (TREE_STATIC (decl))
3495 /* This decl needs a name for the assembler output. We also need
3496 a unique suffix to be added to the name. */
3499 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
3500 compound_literal_number);
3501 compound_literal_number++;
3502 DECL_NAME (decl) = get_identifier (name);
3503 DECL_DEFER_OUTPUT (decl) = 1;
3504 DECL_COMDAT (decl) = 1;
3505 DECL_ARTIFICIAL (decl) = 1;
3507 rest_of_decl_compilation (decl, 1, 0);
3513 /* Make TYPE a complete type based on INITIAL_VALUE.
3514 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3515 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3518 complete_array_type (tree type, tree initial_value, int do_default)
3520 tree maxindex = NULL_TREE;
3525 /* Note MAXINDEX is really the maximum index,
3526 one less than the size. */
3527 if (TREE_CODE (initial_value) == STRING_CST)
3530 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3531 maxindex = build_int_cst (NULL_TREE,
3532 (TREE_STRING_LENGTH (initial_value)
3535 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3537 tree elts = CONSTRUCTOR_ELTS (initial_value);
3538 maxindex = build_int_cst (NULL_TREE, -1);
3539 for (; elts; elts = TREE_CHAIN (elts))
3541 if (TREE_PURPOSE (elts))
3542 maxindex = TREE_PURPOSE (elts);
3544 maxindex = fold (build2 (PLUS_EXPR, integer_type_node,
3545 maxindex, integer_one_node));
3550 /* Make an error message unless that happened already. */
3551 if (initial_value != error_mark_node)
3554 /* Prevent further error messages. */
3555 maxindex = build_int_cst (NULL_TREE, 0);
3562 maxindex = build_int_cst (NULL_TREE, 0);
3568 TYPE_DOMAIN (type) = build_index_type (maxindex);
3570 gcc_assert (TREE_TYPE (maxindex));
3573 /* Lay out the type now that we can get the real answer. */
3580 /* Determine whether TYPE is a structure with a flexible array member,
3581 or a union containing such a structure (possibly recursively). */
3584 flexible_array_type_p (tree type)
3587 switch (TREE_CODE (type))
3590 x = TYPE_FIELDS (type);
3593 while (TREE_CHAIN (x) != NULL_TREE)
3595 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3596 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3597 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3598 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3602 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3604 if (flexible_array_type_p (TREE_TYPE (x)))
3613 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3614 replacing with appropriate values if they are invalid. */
3616 check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
3619 unsigned int max_width;
3620 unsigned HOST_WIDE_INT w;
3621 const char *name = orig_name ? orig_name: _("<anonymous>");
3624 STRIP_NOPS (*width);
3626 /* Detect and ignore out of range field width and process valid
3628 if (TREE_CODE (*width) != INTEGER_CST)
3630 error ("bit-field %qs width not an integer constant", name);
3631 *width = integer_one_node;
3635 constant_expression_warning (*width);
3636 if (tree_int_cst_sgn (*width) < 0)
3638 error ("negative width in bit-field %qs", name);
3639 *width = integer_one_node;
3641 else if (integer_zerop (*width) && orig_name)
3643 error ("zero width for bit-field %qs", name);
3644 *width = integer_one_node;
3648 /* Detect invalid bit-field type. */
3649 if (TREE_CODE (*type) != INTEGER_TYPE
3650 && TREE_CODE (*type) != BOOLEAN_TYPE
3651 && TREE_CODE (*type) != ENUMERAL_TYPE)
3653 error ("bit-field %qs has invalid type", name);
3654 *type = unsigned_type_node;
3657 type_mv = TYPE_MAIN_VARIANT (*type);
3659 && type_mv != integer_type_node
3660 && type_mv != unsigned_type_node
3661 && type_mv != boolean_type_node)
3662 pedwarn ("type of bit-field %qs is a GCC extension", name);
3664 if (type_mv == boolean_type_node)
3665 max_width = CHAR_TYPE_SIZE;
3667 max_width = TYPE_PRECISION (*type);
3669 if (0 < compare_tree_int (*width, max_width))
3671 error ("width of %qs exceeds its type", name);
3673 *width = build_int_cst (NULL_TREE, w);
3676 w = tree_low_cst (*width, 1);
3678 if (TREE_CODE (*type) == ENUMERAL_TYPE)
3680 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
3682 || w < min_precision (lt->enum_min, TYPE_UNSIGNED (*type))
3683 || w < min_precision (lt->enum_max, TYPE_UNSIGNED (*type)))
3684 warning ("%qs is narrower than values of its type", name);
3688 /* Given declspecs and a declarator,
3689 determine the name and type of the object declared
3690 and construct a ..._DECL node for it.
3691 (In one case we can return a ..._TYPE node instead.
3692 For invalid input we sometimes return 0.)
3694 DECLSPECS is a c_declspecs structure for the declaration specifiers.
3696 DECL_CONTEXT says which syntactic context this declaration is in:
3697 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3698 FUNCDEF for a function definition. Like NORMAL but a few different
3699 error messages in each case. Return value may be zero meaning
3700 this definition is too screwy to try to parse.
3701 PARM for a parameter declaration (either within a function prototype
3702 or before a function body). Make a PARM_DECL, or return void_type_node.
3703 TYPENAME if for a typename (in a cast or sizeof).
3704 Don't make a DECL node; just return the ..._TYPE node.
3705 FIELD for a struct or union field; make a FIELD_DECL.
3706 INITIALIZED is true if the decl has an initializer.
3707 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3708 representing the width of the bit-field.
3710 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3711 It may also be so in the PARM case, for a prototype where the
3712 argument type is specified but not the name.
3714 This function is where the complicated C meanings of `static'
3715 and `extern' are interpreted. */
3718 grokdeclarator (const struct c_declarator *declarator,
3719 struct c_declspecs *declspecs,
3720 enum decl_context decl_context, bool initialized, tree *width)
3722 tree type = declspecs->type;
3723 bool threadp = declspecs->thread_p;
3724 enum c_storage_class storage_class = declspecs->storage_class;
3728 int type_quals = TYPE_UNQUALIFIED;
3729 const char *name, *orig_name;
3730 tree typedef_type = 0;
3731 int funcdef_flag = 0;
3732 bool funcdef_syntax = false;
3733 int size_varies = 0;
3734 tree decl_attr = declspecs->decl_attr;
3735 int array_ptr_quals = TYPE_UNQUALIFIED;
3736 tree array_ptr_attrs = NULL_TREE;
3737 int array_parm_static = 0;
3738 tree returned_attrs = NULL_TREE;
3739 bool bitfield = width != NULL;
3741 struct c_arg_info *arg_info = 0;
3743 if (decl_context == FUNCDEF)
3744 funcdef_flag = 1, decl_context = NORMAL;
3746 /* Look inside a declarator for the name being declared
3747 and get it as a string, for an error message. */
3749 const struct c_declarator *decl = declarator;
3758 funcdef_syntax = (decl->kind == cdk_function);
3759 decl = decl->declarator;
3763 decl = decl->declarator;
3768 name = IDENTIFIER_POINTER (decl->u.id);
3780 /* A function definition's declarator must have the form of
3781 a function declarator. */
3783 if (funcdef_flag && !funcdef_syntax)
3786 /* If this looks like a function definition, make it one,
3787 even if it occurs where parms are expected.
3788 Then store_parm_decls will reject it and not use it as a parm. */
3789 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
3790 decl_context = PARM;
3792 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
3793 warn_deprecated_use (declspecs->type);
3795 typedef_type = type;
3796 size_varies = C_TYPE_VARIABLE_SIZE (type);
3798 /* Diagnose defaulting to "int". */
3800 if (declspecs->default_int_p && !in_system_header)
3802 /* Issue a warning if this is an ISO C 99 program or if
3803 -Wreturn-type and this is a function, or if -Wimplicit;
3804 prefer the former warning since it is more explicit. */
3805 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3807 warn_about_return_type = 1;
3808 else if (warn_implicit_int || flag_isoc99)
3809 pedwarn_c99 ("type defaults to %<int%> in declaration of %qs", name);
3812 /* Adjust the type if a bit-field is being declared,
3813 -funsigned-bitfields applied and the type is not explicitly
3815 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
3816 && TREE_CODE (type) == INTEGER_TYPE)
3817 type = c_common_unsigned_type (type);
3819 /* Figure out the type qualifiers for the declaration. There are
3820 two ways a declaration can become qualified. One is something
3821 like `const int i' where the `const' is explicit. Another is
3822 something like `typedef const int CI; CI i' where the type of the
3823 declaration contains the `const'. A third possibility is that
3824 there is a type qualifier on the element type of a typedefed
3825 array type, in which case we should extract that qualifier so
3826 that c_apply_type_quals_to_decls receives the full list of
3827 qualifiers to work with (C90 is not entirely clear about whether
3828 duplicate qualifiers should be diagnosed in this case, but it
3829 seems most appropriate to do so). */
3830 element_type = strip_array_types (type);
3831 constp = declspecs->const_p + TYPE_READONLY (element_type);
3832 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
3833 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
3834 if (pedantic && !flag_isoc99)
3837 pedwarn ("duplicate %<const%>");
3839 pedwarn ("duplicate %<restrict%>");
3841 pedwarn ("duplicate %<volatile%>");
3843 if (!flag_gen_aux_info && (TYPE_QUALS (type)))
3844 type = TYPE_MAIN_VARIANT (type);
3845 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3846 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3847 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3849 /* Warn about storage classes that are invalid for certain
3850 kinds of declarations (parameters, typenames, etc.). */
3854 || storage_class == csc_auto
3855 || storage_class == csc_register
3856 || storage_class == csc_typedef))
3858 if (storage_class == csc_auto
3859 && (pedantic || current_scope == file_scope))
3860 pedwarn ("function definition declared %<auto%>");
3861 if (storage_class == csc_register)
3862 error ("function definition declared %<register%>");
3863 if (storage_class == csc_typedef)
3864 error ("function definition declared %<typedef%>");
3866 error ("function definition declared %<__thread%>");
3868 if (storage_class == csc_auto
3869 || storage_class == csc_register
3870 || storage_class == csc_typedef)
3871 storage_class = csc_none;
3873 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
3875 if (decl_context == PARM && storage_class == csc_register)
3879 switch (decl_context)
3882 error ("storage class specified for structure field %qs",
3886 error ("storage class specified for parameter %qs", name);
3889 error ("storage class specified for typename");
3892 storage_class = csc_none;
3896 else if (storage_class == csc_extern
3900 /* 'extern' with initialization is invalid if not at file scope. */
3901 if (current_scope == file_scope)
3902 warning ("%qs initialized and declared %<extern%>", name);
3904 error ("%qs has both %<extern%> and initializer", name);
3906 else if (current_scope == file_scope)
3908 if (storage_class == csc_auto)
3909 error ("file-scope declaration of %qs specifies %<auto%>", name);
3910 if (pedantic && storage_class == csc_register)
3911 pedwarn ("file-scope declaration of %qs specifies %<register%>", name);
3915 if (storage_class == csc_extern && funcdef_flag)
3916 error ("nested function %qs declared %<extern%>", name);
3917 else if (threadp && storage_class == csc_none)
3919 error ("function-scope %qs implicitly auto and declared "
3926 /* Now figure out the structure of the declarator proper.
3927 Descend through it, creating more complex types, until we reach
3928 the declared identifier (or NULL_TREE, in an absolute declarator). */
3930 while (declarator && declarator->kind != cdk_id)
3932 if (type == error_mark_node)
3934 declarator = declarator->declarator;
3938 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
3939 a cdk_pointer (for *...),
3940 a cdk_function (for ...(...)),
3941 a cdk_attrs (for nested attributes),
3942 or a cdk_id (for the name being declared
3943 or the place in an absolute declarator
3944 where the name was omitted).
3945 For the last case, we have just exited the loop.
3947 At this point, TYPE is the type of elements of an array,
3948 or for a function to return, or for a pointer to point to.
3949 After this sequence of ifs, TYPE is the type of the
3950 array or function or pointer, and DECLARATOR has had its
3951 outermost layer removed. */
3953 if (array_ptr_quals != TYPE_UNQUALIFIED
3954 || array_ptr_attrs != NULL_TREE
3955 || array_parm_static)
3957 /* Only the innermost declarator (making a parameter be of
3958 array type which is converted to pointer type)
3959 may have static or type qualifiers. */
3960 error ("static or type qualifiers in non-parameter array declarator");
3961 array_ptr_quals = TYPE_UNQUALIFIED;
3962 array_ptr_attrs = NULL_TREE;
3963 array_parm_static = 0;
3966 switch (declarator->kind)
3970 /* A declarator with embedded attributes. */
3971 tree attrs = declarator->u.attrs;
3972 const struct c_declarator *inner_decl;
3974 declarator = declarator->declarator;
3975 inner_decl = declarator;
3976 while (inner_decl->kind == cdk_attrs)
3977 inner_decl = inner_decl->declarator;
3978 if (inner_decl->kind == cdk_id)
3979 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
3980 else if (inner_decl->kind == cdk_function)
3981 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
3982 else if (inner_decl->kind == cdk_array)
3983 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
3984 returned_attrs = decl_attributes (&type,
3985 chainon (returned_attrs, attrs),
3991 tree itype = NULL_TREE;
3992 tree size = declarator->u.array.dimen;
3993 /* The index is a signed object `sizetype' bits wide. */
3994 tree index_type = c_common_signed_type (sizetype);
3996 array_ptr_quals = declarator->u.array.quals;
3997 array_ptr_attrs = declarator->u.array.attrs;
3998 array_parm_static = declarator->u.array.static_p;
4000 declarator = declarator->declarator;
4002 /* Check for some types that there cannot be arrays of. */
4004 if (VOID_TYPE_P (type))
4006 error ("declaration of %qs as array of voids", name);
4007 type = error_mark_node;
4010 if (TREE_CODE (type) == FUNCTION_TYPE)
4012 error ("declaration of %qs as array of functions", name);
4013 type = error_mark_node;
4016 if (pedantic && !in_system_header && flexible_array_type_p (type))
4017 pedwarn ("invalid use of structure with flexible array member");
4019 if (size == error_mark_node)
4020 type = error_mark_node;
4022 if (type == error_mark_node)
4025 /* If size was specified, set ITYPE to a range-type for
4026 that size. Otherwise, ITYPE remains null. finish_decl
4027 may figure it out from an initial value. */
4031 /* Strip NON_LVALUE_EXPRs since we aren't using as an
4033 STRIP_TYPE_NOPS (size);
4035 if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
4037 error ("size of array %qs has non-integer type", name);
4038 size = integer_one_node;
4041 if (pedantic && integer_zerop (size))
4042 pedwarn ("ISO C forbids zero-size array %qs", name);
4044 if (TREE_CODE (size) == INTEGER_CST)
4046 constant_expression_warning (size);
4047 if (tree_int_cst_sgn (size) < 0)
4049 error ("size of array %qs is negative", name);
4050 size = integer_one_node;
4055 /* Make sure the array size remains visibly
4056 nonconstant even if it is (eg) a const variable
4057 with known value. */
4060 if (!flag_isoc99 && pedantic)
4062 if (TREE_CONSTANT (size))
4063 pedwarn ("ISO C90 forbids array %qs whose size "
4064 "can%'t be evaluated",
4067 pedwarn ("ISO C90 forbids variable-size array %qs",
4072 if (integer_zerop (size))
4074 /* A zero-length array cannot be represented with
4075 an unsigned index type, which is what we'll
4076 get with build_index_type. Create an
4077 open-ended range instead. */
4078 itype = build_range_type (sizetype, size, NULL_TREE);
4082 /* Arrange for the SAVE_EXPR on the inside of the
4083 MINUS_EXPR, which allows the -1 to get folded
4084 with the +1 that happens when building TYPE_SIZE. */
4086 size = variable_size (size);
4088 /* Compute the maximum valid index, that is, size
4089 - 1. Do the calculation in index_type, so that
4090 if it is a variable the computations will be
4091 done in the proper mode. */
4092 itype = fold (build2 (MINUS_EXPR, index_type,
4093 convert (index_type, size),
4094 convert (index_type,
4097 /* If that overflowed, the array is too big. ???
4098 While a size of INT_MAX+1 technically shouldn't
4099 cause an overflow (because we subtract 1), the
4100 overflow is recorded during the conversion to
4101 index_type, before the subtraction. Handling
4102 this case seems like an unnecessary
4104 if (TREE_OVERFLOW (itype))
4106 error ("size of array %qs is too large", name);
4107 type = error_mark_node;
4111 itype = build_index_type (itype);
4114 else if (decl_context == FIELD)
4116 if (pedantic && !flag_isoc99 && !in_system_header)
4117 pedwarn ("ISO C90 does not support flexible array members");
4119 /* ISO C99 Flexible array members are effectively
4120 identical to GCC's zero-length array extension. */
4121 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4124 /* If pedantic, complain about arrays of incomplete types. */
4125 if (pedantic && !COMPLETE_TYPE_P (type))
4126 pedwarn ("array type has incomplete element type");
4128 /* Build the array type itself, then merge any constancy
4129 or volatility into the target type. We must do it in
4130 this order to ensure that the TYPE_MAIN_VARIANT field
4131 of the array type is set correctly. */
4132 type = build_array_type (type, itype);
4134 type = c_build_qualified_type (type, type_quals);
4137 C_TYPE_VARIABLE_SIZE (type) = 1;
4139 /* The GCC extension for zero-length arrays differs from
4140 ISO flexible array members in that sizeof yields
4142 if (size && integer_zerop (size))
4144 TYPE_SIZE (type) = bitsize_zero_node;
4145 TYPE_SIZE_UNIT (type) = size_zero_node;
4148 if (decl_context != PARM
4149 && (array_ptr_quals != TYPE_UNQUALIFIED
4150 || array_ptr_attrs != NULL_TREE
4151 || array_parm_static))
4153 error ("static or type qualifiers in non-parameter array declarator");
4154 array_ptr_quals = TYPE_UNQUALIFIED;
4155 array_ptr_attrs = NULL_TREE;
4156 array_parm_static = 0;
4162 /* Say it's a definition only for the declarator closest
4163 to the identifier, apart possibly from some
4165 bool really_funcdef = false;
4169 const struct c_declarator *t = declarator->declarator;
4170 while (t->kind == cdk_attrs)
4172 really_funcdef = (t->kind == cdk_id);
4175 /* Declaring a function type. Make sure we have a valid
4176 type for the function to return. */
4177 if (type == error_mark_node)
4182 /* Warn about some types functions can't return. */
4183 if (TREE_CODE (type) == FUNCTION_TYPE)
4185 error ("%qs declared as function returning a function", name);
4186 type = integer_type_node;
4188 if (TREE_CODE (type) == ARRAY_TYPE)
4190 error ("%qs declared as function returning an array", name);
4191 type = integer_type_node;
4194 /* Construct the function type and go to the next
4195 inner layer of declarator. */
4196 arg_info = declarator->u.arg_info;
4197 arg_types = grokparms (arg_info, really_funcdef);
4199 /* Type qualifiers before the return type of the function
4200 qualify the return type, not the function type. */
4203 /* Type qualifiers on a function return type are
4204 normally permitted by the standard but have no
4205 effect, so give a warning at -Wreturn-type.
4206 Qualifiers on a void return type are banned on
4207 function definitions in ISO C; GCC used to used
4208 them for noreturn functions. */
4209 if (VOID_TYPE_P (type) && really_funcdef)
4210 pedwarn ("function definition has qualified void return type");
4211 else if (warn_return_type)
4212 warning ("type qualifiers ignored on function return type");
4214 type = c_build_qualified_type (type, type_quals);
4216 type_quals = TYPE_UNQUALIFIED;
4218 type = build_function_type (type, arg_types);
4219 declarator = declarator->declarator;
4221 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4222 the formal parameter list of this FUNCTION_TYPE to point to
4223 the FUNCTION_TYPE node itself. */
4227 for (link = arg_info->tags;
4229 link = TREE_CHAIN (link))
4230 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4236 /* Merge any constancy or volatility into the target type
4239 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4241 pedwarn ("ISO C forbids qualified function types");
4243 type = c_build_qualified_type (type, type_quals);
4246 type = build_pointer_type (type);
4248 /* Process type qualifiers (such as const or volatile)
4249 that were given inside the `*'. */
4250 type_quals = declarator->u.pointer_quals;
4252 declarator = declarator->declarator;
4260 /* Now TYPE has the actual type. */
4262 /* Check the type and width of a bit-field. */
4264 check_bitfield_type_and_width (&type, width, orig_name);
4266 /* Did array size calculations overflow? */
4268 if (TREE_CODE (type) == ARRAY_TYPE
4269 && COMPLETE_TYPE_P (type)
4270 && TREE_OVERFLOW (TYPE_SIZE (type)))
4272 error ("size of array %qs is too large", name);
4273 /* If we proceed with the array type as it is, we'll eventually
4274 crash in tree_low_cst(). */
4275 type = error_mark_node;
4278 /* If this is declaring a typedef name, return a TYPE_DECL. */
4280 if (storage_class == csc_typedef)
4283 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4285 pedwarn ("ISO C forbids qualified function types");
4287 type = c_build_qualified_type (type, type_quals);
4288 decl = build_decl (TYPE_DECL, declarator->u.id, type);
4289 if (declspecs->explicit_signed_p)
4290 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4291 decl_attributes (&decl, returned_attrs, 0);
4292 if (declspecs->inline_p)
4293 pedwarn ("%Jtypedef %qD declared %<inline%>", decl, decl);
4297 /* Detect the case of an array type of unspecified size
4298 which came, as such, direct from a typedef name.
4299 We must copy the type, so that each identifier gets
4300 a distinct type, so that each identifier's size can be
4301 controlled separately by its own initializer. */
4303 if (type != 0 && typedef_type != 0
4304 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4305 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4307 type = build_array_type (TREE_TYPE (type), 0);
4309 C_TYPE_VARIABLE_SIZE (type) = 1;
4312 /* If this is a type name (such as, in a cast or sizeof),
4313 compute the type and return it now. */
4315 if (decl_context == TYPENAME)
4317 /* Note that the grammar rejects storage classes in typenames
4319 gcc_assert (storage_class == csc_none && !threadp
4320 && !declspecs->inline_p);
4321 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4323 pedwarn ("ISO C forbids const or volatile function types");
4325 type = c_build_qualified_type (type, type_quals);
4326 decl_attributes (&type, returned_attrs, 0);
4330 /* Aside from typedefs and type names (handle above),
4331 `void' at top level (not within pointer)
4332 is allowed only in public variables.
4333 We don't complain about parms either, but that is because
4334 a better error message can be made later. */
4336 if (VOID_TYPE_P (type) && decl_context != PARM
4337 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4338 && (storage_class == csc_extern
4339 || (current_scope == file_scope
4340 && !(storage_class == csc_static
4341 || storage_class == csc_register)))))
4343 error ("variable or field %qs declared void", name);
4344 type = integer_type_node;
4347 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4348 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4353 if (decl_context == PARM)
4355 tree type_as_written;
4358 /* A parameter declared as an array of T is really a pointer to T.
4359 One declared as a function is really a pointer to a function. */
4361 if (TREE_CODE (type) == ARRAY_TYPE)
4363 /* Transfer const-ness of array into that of type pointed to. */
4364 type = TREE_TYPE (type);
4366 type = c_build_qualified_type (type, type_quals);
4367 type = build_pointer_type (type);
4368 type_quals = array_ptr_quals;
4370 /* We don't yet implement attributes in this context. */
4371 if (array_ptr_attrs != NULL_TREE)
4372 warning ("attributes in parameter array declarator ignored");
4376 else if (TREE_CODE (type) == FUNCTION_TYPE)
4378 if (pedantic && type_quals)
4379 pedwarn ("ISO C forbids qualified function types");
4381 type = c_build_qualified_type (type, type_quals);
4382 type = build_pointer_type (type);
4383 type_quals = TYPE_UNQUALIFIED;
4385 else if (type_quals)
4386 type = c_build_qualified_type (type, type_quals);
4388 type_as_written = type;
4390 decl = build_decl (PARM_DECL, declarator->u.id, type);
4392 C_DECL_VARIABLE_SIZE (decl) = 1;
4394 /* Compute the type actually passed in the parmlist,
4395 for the case where there is no prototype.
4396 (For example, shorts and chars are passed as ints.)
4397 When there is a prototype, this is overridden later. */
4399 if (type == error_mark_node)
4400 promoted_type = type;
4402 promoted_type = c_type_promotes_to (type);
4404 DECL_ARG_TYPE (decl) = promoted_type;
4405 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4406 if (declspecs->inline_p)
4407 pedwarn ("%Jparameter %qD declared %<inline%>", decl, decl);
4409 else if (decl_context == FIELD)
4411 /* Note that the grammar rejects storage classes in typenames
4413 gcc_assert (storage_class == csc_none && !threadp
4414 && !declspecs->inline_p);
4416 /* Structure field. It may not be a function. */
4418 if (TREE_CODE (type) == FUNCTION_TYPE)
4420 error ("field %qs declared as a function", name);
4421 type = build_pointer_type (type);
4423 else if (TREE_CODE (type) != ERROR_MARK
4424 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4426 error ("field %qs has incomplete type", name);
4427 type = error_mark_node;
4429 /* Move type qualifiers down to element of an array. */
4430 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4431 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4433 TYPE_DOMAIN (type));
4434 decl = build_decl (FIELD_DECL, declarator->u.id, type);
4435 DECL_NONADDRESSABLE_P (decl) = bitfield;
4438 C_DECL_VARIABLE_SIZE (decl) = 1;
4440 else if (TREE_CODE (type) == FUNCTION_TYPE)
4442 if (storage_class == csc_register || threadp)
4444 error ("invalid storage class for function %qs", name);
4446 else if (current_scope != file_scope)
4448 /* Function declaration not at file scope. Storage
4449 classes other than `extern' are not allowed, C99
4450 6.7.1p5, and `extern' makes no difference. However,
4451 GCC allows 'auto', perhaps with 'inline', to support
4452 nested functions. */
4453 if (storage_class == csc_auto)
4456 pedwarn ("invalid storage class for function %qs", name);
4458 else if (storage_class == csc_static)
4460 error ("invalid storage class for function %qs", name);
4462 storage_class = declspecs->storage_class = csc_none;
4468 decl = build_decl (FUNCTION_DECL, declarator->u.id, type);
4469 decl = build_decl_attribute_variant (decl, decl_attr);
4471 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
4473 if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
4474 pedwarn ("ISO C forbids qualified function types");
4476 /* GNU C interprets a volatile-qualified function type to indicate
4477 that the function does not return. */
4478 if ((type_quals & TYPE_QUAL_VOLATILE)
4479 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4480 warning ("%<noreturn%> function returns non-void value");
4482 /* Every function declaration is an external reference
4483 (DECL_EXTERNAL) except for those which are not at file
4484 scope and are explicitly declared "auto". This is
4485 forbidden by standard C (C99 6.7.1p5) and is interpreted by
4486 GCC to signify a forward declaration of a nested function. */
4487 if (storage_class == csc_auto && current_scope != file_scope)
4488 DECL_EXTERNAL (decl) = 0;
4490 DECL_EXTERNAL (decl) = 1;
4492 /* Record absence of global scope for `static' or `auto'. */
4494 = !(storage_class == csc_static || storage_class == csc_auto);
4496 /* For a function definition, record the argument information
4497 block where store_parm_decls will look for it. */
4499 current_function_arg_info = arg_info;
4501 if (declspecs->default_int_p)
4502 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4504 /* Record presence of `inline', if it is reasonable. */
4505 if (flag_hosted && MAIN_NAME_P (declarator->u.id))
4507 if (declspecs->inline_p)
4508 pedwarn ("cannot inline function %<main%>");
4510 else if (declspecs->inline_p)
4512 /* Record that the function is declared `inline'. */
4513 DECL_DECLARED_INLINE_P (decl) = 1;
4515 /* Do not mark bare declarations as DECL_INLINE. Doing so
4516 in the presence of multiple declarations can result in
4517 the abstract origin pointing between the declarations,
4518 which will confuse dwarf2out. */
4521 DECL_INLINE (decl) = 1;
4522 if (storage_class == csc_extern)
4523 current_extern_inline = 1;
4526 /* If -finline-functions, assume it can be inlined. This does
4527 two things: let the function be deferred until it is actually
4528 needed, and let dwarf2 know that the function is inlinable. */
4529 else if (flag_inline_trees == 2 && initialized)
4530 DECL_INLINE (decl) = 1;
4534 /* It's a variable. */
4535 /* An uninitialized decl with `extern' is a reference. */
4536 int extern_ref = !initialized && storage_class == csc_extern;
4538 /* Move type qualifiers down to element of an array. */
4539 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4541 int saved_align = TYPE_ALIGN(type);
4542 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4544 TYPE_DOMAIN (type));
4545 TYPE_ALIGN (type) = saved_align;
4547 else if (type_quals)
4548 type = c_build_qualified_type (type, type_quals);
4550 /* C99 6.2.2p7: It is invalid (compile-time undefined
4551 behavior) to create an 'extern' declaration for a
4552 variable if there is a global declaration that is
4553 'static' and the global declaration is not visible.
4554 (If the static declaration _is_ currently visible,
4555 the 'extern' declaration is taken to refer to that decl.) */
4556 if (extern_ref && current_scope != file_scope)
4558 tree global_decl = identifier_global_value (declarator->u.id);
4559 tree visible_decl = lookup_name (declarator->u.id);
4562 && global_decl != visible_decl
4563 && TREE_CODE (global_decl) == VAR_DECL
4564 && !TREE_PUBLIC (global_decl))
4565 error ("variable previously declared %<static%> redeclared "
4569 decl = build_decl (VAR_DECL, declarator->u.id, type);
4571 C_DECL_VARIABLE_SIZE (decl) = 1;
4573 if (declspecs->inline_p)
4574 pedwarn ("%Jvariable %qD declared %<inline%>", decl, decl);
4576 /* At file scope, an initialized extern declaration may follow
4577 a static declaration. In that case, DECL_EXTERNAL will be
4578 reset later in start_decl. */
4579 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
4581 /* At file scope, the presence of a `static' or `register' storage
4582 class specifier, or the absence of all storage class specifiers
4583 makes this declaration a definition (perhaps tentative). Also,
4584 the absence of both `static' and `register' makes it public. */
4585 if (current_scope == file_scope)
4587 TREE_PUBLIC (decl) = !(storage_class == csc_static
4588 || storage_class == csc_register);
4589 TREE_STATIC (decl) = !extern_ref;
4591 /* Not at file scope, only `static' makes a static definition. */
4594 TREE_STATIC (decl) = (storage_class == csc_static);
4595 TREE_PUBLIC (decl) = extern_ref;
4600 if (targetm.have_tls)
4601 DECL_THREAD_LOCAL (decl) = 1;
4603 /* A mere warning is sure to result in improper semantics
4604 at runtime. Don't bother to allow this to compile. */
4605 error ("thread-local storage not supported for this target");
4609 /* Record `register' declaration for warnings on &
4610 and in case doing stupid register allocation. */
4612 if (storage_class == csc_register)
4614 C_DECL_REGISTER (decl) = 1;
4615 DECL_REGISTER (decl) = 1;
4618 /* Record constancy and volatility. */
4619 c_apply_type_quals_to_decl (type_quals, decl);
4621 /* If a type has volatile components, it should be stored in memory.
4622 Otherwise, the fact that those components are volatile
4623 will be ignored, and would even crash the compiler. */
4624 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4626 /* It is not an error for a structure with volatile fields to
4627 be declared register, but reset DECL_REGISTER since it
4628 cannot actually go in a register. */
4629 int was_reg = C_DECL_REGISTER (decl);
4630 C_DECL_REGISTER (decl) = 0;
4631 DECL_REGISTER (decl) = 0;
4632 c_mark_addressable (decl);
4633 C_DECL_REGISTER (decl) = was_reg;
4636 /* This is the earliest point at which we might know the assembler
4637 name of a variable. Thus, if it's known before this, die horribly. */
4638 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
4640 decl_attributes (&decl, returned_attrs, 0);
4646 /* Decode the parameter-list info for a function type or function definition.
4647 The argument is the value returned by `get_parm_info' (or made in parse.y
4648 if there is an identifier list instead of a parameter decl list).
4649 These two functions are separate because when a function returns
4650 or receives functions then each is called multiple times but the order
4651 of calls is different. The last call to `grokparms' is always the one
4652 that contains the formal parameter names of a function definition.
4654 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4656 FUNCDEF_FLAG is true for a function definition, false for
4657 a mere declaration. A nonempty identifier-list gets an error message
4658 when FUNCDEF_FLAG is false. */
4661 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
4663 tree arg_types = arg_info->types;
4665 if (warn_strict_prototypes && arg_types == 0 && !funcdef_flag
4666 && !in_system_header)
4667 warning ("function declaration isn%'t a prototype");
4669 if (arg_types == error_mark_node)
4670 return 0; /* don't set TYPE_ARG_TYPES in this case */
4672 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
4675 pedwarn ("parameter names (without types) in function declaration");
4677 arg_info->parms = arg_info->types;
4678 arg_info->types = 0;
4683 tree parm, type, typelt;
4684 unsigned int parmno;
4686 /* If there is a parameter of incomplete type in a definition,
4687 this is an error. In a declaration this is valid, and a
4688 struct or union type may be completed later, before any calls
4689 or definition of the function. In the case where the tag was
4690 first declared within the parameter list, a warning has
4691 already been given. If a parameter has void type, then
4692 however the function cannot be defined or called, so
4695 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
4697 parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
4699 type = TREE_VALUE (typelt);
4700 if (type == error_mark_node)
4703 if (!COMPLETE_TYPE_P (type))
4707 if (DECL_NAME (parm))
4708 error ("%Jparameter %u (%qD) has incomplete type",
4709 parm, parmno, parm);
4711 error ("%Jparameter %u has incomplete type",
4714 TREE_VALUE (typelt) = error_mark_node;
4715 TREE_TYPE (parm) = error_mark_node;
4717 else if (VOID_TYPE_P (type))
4719 if (DECL_NAME (parm))
4720 warning ("%Jparameter %u (%qD) has void type",
4721 parm, parmno, parm);
4723 warning ("%Jparameter %u has void type",
4732 /* Take apart the current scope and return a c_arg_info structure with
4733 info on a parameter list just parsed.
4735 This structure is later fed to 'grokparms' and 'store_parm_decls'.
4737 ELLIPSIS being true means the argument list ended in '...' so don't
4738 append a sentinel (void_list_node) to the end of the type-list. */
4741 get_parm_info (bool ellipsis)
4743 struct c_binding *b = current_scope->bindings;
4744 struct c_arg_info *arg_info = XOBNEW (&parser_obstack,
4751 static bool explained_incomplete_types = false;
4752 bool gave_void_only_once_err = false;
4754 arg_info->parms = 0;
4756 arg_info->types = 0;
4757 arg_info->others = 0;
4759 /* The bindings in this scope must not get put into a block.
4760 We will take care of deleting the binding nodes. */
4761 current_scope->bindings = 0;
4763 /* This function is only called if there was *something* on the
4767 /* A parameter list consisting solely of 'void' indicates that the
4768 function takes no arguments. But if the 'void' is qualified
4769 (by 'const' or 'volatile'), or has a storage class specifier
4770 ('register'), then the behavior is undefined; issue an error.
4771 Typedefs for 'void' are OK (see DR#157). */
4772 if (b->prev == 0 /* one binding */
4773 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
4774 && !DECL_NAME (b->decl) /* anonymous */
4775 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
4777 if (TREE_THIS_VOLATILE (b->decl)
4778 || TREE_READONLY (b->decl)
4779 || C_DECL_REGISTER (b->decl))
4780 error ("%<void%> as only parameter may not be qualified");
4782 /* There cannot be an ellipsis. */
4784 error ("%<void%> must be the only parameter");
4786 arg_info->types = void_list_node;
4791 types = void_list_node;
4793 /* Break up the bindings list into parms, tags, types, and others;
4794 apply sanity checks; purge the name-to-decl bindings. */
4797 tree decl = b->decl;
4798 tree type = TREE_TYPE (decl);
4799 const char *keyword;
4801 switch (TREE_CODE (decl))
4806 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
4807 I_SYMBOL_BINDING (b->id) = b->shadowed;
4810 /* Check for forward decls that never got their actual decl. */
4811 if (TREE_ASM_WRITTEN (decl))
4812 error ("%Jparameter %qD has just a forward declaration",
4814 /* Check for (..., void, ...) and issue an error. */
4815 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
4817 if (!gave_void_only_once_err)
4819 error ("%<void%> must be the only parameter");
4820 gave_void_only_once_err = true;
4825 /* Valid parameter, add it to the list. */
4826 TREE_CHAIN (decl) = parms;
4829 /* Since there is a prototype, args are passed in their
4830 declared types. The back end may override this later. */
4831 DECL_ARG_TYPE (decl) = type;
4832 types = tree_cons (0, type, types);
4836 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
4837 case UNION_TYPE: keyword = "union"; goto tag;
4838 case RECORD_TYPE: keyword = "struct"; goto tag;
4840 /* Types may not have tag-names, in which case the type
4841 appears in the bindings list with b->id NULL. */
4844 gcc_assert (I_TAG_BINDING (b->id) == b);
4845 I_TAG_BINDING (b->id) = b->shadowed;
4848 /* Warn about any struct, union or enum tags defined in a
4849 parameter list. The scope of such types is limited to
4850 the parameter list, which is rarely if ever desirable
4851 (it's impossible to call such a function with type-
4852 correct arguments). An anonymous union parm type is
4853 meaningful as a GNU extension, so don't warn for that. */
4854 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
4857 /* The %s will be one of 'struct', 'union', or 'enum'. */
4858 warning ("%<%s %E%> declared inside parameter list",
4861 /* The %s will be one of 'struct', 'union', or 'enum'. */
4862 warning ("anonymous %s declared inside parameter list",
4865 if (!explained_incomplete_types)
4867 warning ("its scope is only this definition or declaration,"
4868 " which is probably not what you want");
4869 explained_incomplete_types = true;
4873 tags = tree_cons (b->id, decl, tags);
4879 /* CONST_DECLs appear here when we have an embedded enum,
4880 and TYPE_DECLs appear here when we have an embedded struct
4881 or union. No warnings for this - we already warned about the
4882 type itself. FUNCTION_DECLs appear when there is an implicit
4883 function declaration in the parameter list. */
4885 TREE_CHAIN (decl) = others;
4890 /* error_mark_node appears here when we have an undeclared
4891 variable. Just throw it away. */
4894 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
4895 I_SYMBOL_BINDING (b->id) = b->shadowed;
4899 /* Other things that might be encountered. */
4906 b = free_binding_and_advance (b);
4909 arg_info->parms = parms;
4910 arg_info->tags = tags;
4911 arg_info->types = types;
4912 arg_info->others = others;
4916 /* Get the struct, enum or union (CODE says which) with tag NAME.
4917 Define the tag as a forward-reference if it is not defined.
4918 Return a c_typespec structure for the type specifier. */
4921 parser_xref_tag (enum tree_code code, tree name)
4923 struct c_typespec ret;
4924 /* If a cross reference is requested, look up the type
4925 already defined for this tag and return it. */
4927 tree ref = lookup_tag (code, name, 0);
4928 /* If this is the right type of tag, return what we found.
4929 (This reference will be shadowed by shadow_tag later if appropriate.)
4930 If this is the wrong type of tag, do not return it. If it was the
4931 wrong type in the same scope, we will have had an error
4932 message already; if in a different scope and declaring
4933 a name, pending_xref_error will give an error message; but if in a
4934 different scope and not declaring a name, this tag should
4935 shadow the previous declaration of a different type of tag, and
4936 this would not work properly if we return the reference found.
4937 (For example, with "struct foo" in an outer scope, "union foo;"
4938 must shadow that tag with a new one of union type.) */
4939 ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref);
4940 if (ref && TREE_CODE (ref) == code)
4946 /* If no such tag is yet defined, create a forward-reference node
4947 and record it as the "definition".
4948 When a real declaration of this type is found,
4949 the forward-reference will be altered into a real type. */
4951 ref = make_node (code);
4952 if (code == ENUMERAL_TYPE)
4954 /* Give the type a default layout like unsigned int
4955 to avoid crashing if it does not get defined. */
4956 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
4957 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
4958 TYPE_USER_ALIGN (ref) = 0;
4959 TYPE_UNSIGNED (ref) = 1;
4960 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
4961 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
4962 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
4965 pushtag (name, ref);
4971 /* Get the struct, enum or union (CODE says which) with tag NAME.
4972 Define the tag as a forward-reference if it is not defined.
4973 Return a tree for the type. */
4976 xref_tag (enum tree_code code, tree name)
4978 return parser_xref_tag (code, name).spec;
4981 /* Make sure that the tag NAME is defined *in the current scope*
4982 at least as a forward reference.
4983 CODE says which kind of tag NAME ought to be. */
4986 start_struct (enum tree_code code, tree name)
4988 /* If there is already a tag defined at this scope
4989 (as a forward reference), just return it. */
4994 ref = lookup_tag (code, name, 1);
4995 if (ref && TREE_CODE (ref) == code)
4997 if (TYPE_SIZE (ref))
4999 if (code == UNION_TYPE)
5000 error ("redefinition of %<union %s%>", IDENTIFIER_POINTER (name));
5002 error ("redefinition of %<struct %s%>", IDENTIFIER_POINTER (name));
5004 else if (C_TYPE_BEING_DEFINED (ref))
5006 if (code == UNION_TYPE)
5007 error ("nested redefinition of %<union %s%>",
5008 IDENTIFIER_POINTER (name));
5010 error ("nested redefinition of %<struct %s%>",
5011 IDENTIFIER_POINTER (name));
5016 /* Otherwise create a forward-reference just so the tag is in scope. */
5018 ref = make_node (code);
5019 pushtag (name, ref);
5022 C_TYPE_BEING_DEFINED (ref) = 1;
5023 TYPE_PACKED (ref) = flag_pack_struct;
5027 /* Process the specs, declarator and width (NULL if omitted)
5028 of a structure component, returning a FIELD_DECL node.
5029 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
5031 This is done during the parsing of the struct declaration.
5032 The FIELD_DECL nodes are chained together and the lot of them
5033 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5036 grokfield (struct c_declarator *declarator, struct c_declspecs *declspecs,
5041 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
5042 && width == NULL_TREE)
5044 /* This is an unnamed decl.
5046 If we have something of the form "union { list } ;" then this
5047 is the anonymous union extension. Similarly for struct.
5049 If this is something of the form "struct foo;", then
5050 If MS extensions are enabled, this is handled as an
5052 Otherwise this is a forward declaration of a structure tag.
5054 If this is something of the form "foo;" and foo is a TYPE_DECL, then
5055 If MS extensions are enabled and foo names a structure, then
5056 again this is an anonymous struct.
5057 Otherwise this is an error.
5059 Oh what a horrid tangled web we weave. I wonder if MS consciously
5060 took this from Plan 9 or if it was an accident of implementation
5061 that took root before someone noticed the bug... */
5063 tree type = declspecs->type;
5064 bool type_ok = (TREE_CODE (type) == RECORD_TYPE
5065 || TREE_CODE (type) == UNION_TYPE);
5069 && (flag_ms_extensions || !declspecs->typedef_p))
5071 if (flag_ms_extensions)
5075 else if (TYPE_NAME (type) == NULL)
5082 pedwarn ("declaration does not declare anything");
5086 pedwarn ("ISO C doesn%'t support unnamed structs/unions");
5089 value = grokdeclarator (declarator, declspecs, FIELD, false,
5090 width ? &width : NULL);
5092 finish_decl (value, NULL_TREE, NULL_TREE);
5093 DECL_INITIAL (value) = width;
5098 /* Generate an error for any duplicate field names in FIELDLIST. Munge
5099 the list such that this does not present a problem later. */
5102 detect_field_duplicates (tree fieldlist)
5107 /* First, see if there are more than "a few" fields.
5108 This is trivially true if there are zero or one fields. */
5111 x = TREE_CHAIN (fieldlist);
5117 } while (timeout > 0 && x);
5119 /* If there were "few" fields, avoid the overhead of allocating
5120 a hash table. Instead just do the nested traversal thing. */
5123 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
5126 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
5127 if (DECL_NAME (y) == DECL_NAME (x))
5129 error ("%Jduplicate member %qD", x, x);
5130 DECL_NAME (x) = NULL_TREE;
5136 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
5139 for (x = fieldlist; x ; x = TREE_CHAIN (x))
5140 if ((y = DECL_NAME (x)) != 0)
5142 slot = htab_find_slot (htab, y, INSERT);
5145 error ("%Jduplicate member %qD", x, x);
5146 DECL_NAME (x) = NULL_TREE;
5155 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5156 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5157 ATTRIBUTES are attributes to be applied to the structure. */
5160 finish_struct (tree t, tree fieldlist, tree attributes)
5163 bool toplevel = file_scope == current_scope;
5164 int saw_named_field;
5166 /* If this type was previously laid out as a forward reference,
5167 make sure we lay it out again. */
5171 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5175 for (x = fieldlist; x; x = TREE_CHAIN (x))
5176 if (DECL_NAME (x) != 0)
5181 if (TREE_CODE (t) == UNION_TYPE)
5184 pedwarn ("union has no named members");
5186 pedwarn ("union has no members");
5191 pedwarn ("struct has no named members");
5193 pedwarn ("struct has no members");
5198 /* Install struct as DECL_CONTEXT of each field decl.
5199 Also process specified field sizes, found in the DECL_INITIAL,
5200 storing 0 there after the type has been changed to precision equal
5201 to its width, rather than the precision of the specified standard
5202 type. (Correct layout requires the original type to have been preserved
5205 saw_named_field = 0;
5206 for (x = fieldlist; x; x = TREE_CHAIN (x))
5208 DECL_CONTEXT (x) = t;
5209 DECL_PACKED (x) |= TYPE_PACKED (t);
5211 /* If any field is const, the structure type is pseudo-const. */
5212 if (TREE_READONLY (x))
5213 C_TYPE_FIELDS_READONLY (t) = 1;
5216 /* A field that is pseudo-const makes the structure likewise. */
5217 tree t1 = TREE_TYPE (x);
5218 while (TREE_CODE (t1) == ARRAY_TYPE)
5219 t1 = TREE_TYPE (t1);
5220 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5221 && C_TYPE_FIELDS_READONLY (t1))
5222 C_TYPE_FIELDS_READONLY (t) = 1;
5225 /* Any field that is volatile means variables of this type must be
5226 treated in some ways as volatile. */
5227 if (TREE_THIS_VOLATILE (x))
5228 C_TYPE_FIELDS_VOLATILE (t) = 1;
5230 /* Any field of nominal variable size implies structure is too. */
5231 if (C_DECL_VARIABLE_SIZE (x))
5232 C_TYPE_VARIABLE_SIZE (t) = 1;
5234 if (DECL_INITIAL (x))
5236 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
5237 DECL_SIZE (x) = bitsize_int (width);
5238 DECL_BIT_FIELD (x) = 1;
5239 SET_DECL_C_BIT_FIELD (x);
5242 /* Detect flexible array member in an invalid context. */
5243 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5244 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5245 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5246 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5248 if (TREE_CODE (t) == UNION_TYPE)
5250 error ("%Jflexible array member in union", x);
5251 TREE_TYPE (x) = error_mark_node;
5253 else if (TREE_CHAIN (x) != NULL_TREE)
5255 error ("%Jflexible array member not at end of struct", x);
5256 TREE_TYPE (x) = error_mark_node;
5258 else if (!saw_named_field)
5260 error ("%Jflexible array member in otherwise empty struct", x);
5261 TREE_TYPE (x) = error_mark_node;
5265 if (pedantic && !in_system_header && TREE_CODE (t) == RECORD_TYPE
5266 && flexible_array_type_p (TREE_TYPE (x)))
5267 pedwarn ("%Jinvalid use of structure with flexible array member", x);
5270 saw_named_field = 1;
5273 detect_field_duplicates (fieldlist);
5275 /* Now we have the nearly final fieldlist. Record it,
5276 then lay out the structure or union (including the fields). */
5278 TYPE_FIELDS (t) = fieldlist;
5282 /* Give bit-fields their proper types. */
5284 tree *fieldlistp = &fieldlist;
5286 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
5287 && TREE_TYPE (*fieldlistp) != error_mark_node)
5289 unsigned HOST_WIDE_INT width
5290 = tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
5291 tree type = TREE_TYPE (*fieldlistp);
5292 if (width != TYPE_PRECISION (type))
5293 TREE_TYPE (*fieldlistp)
5294 = build_nonstandard_integer_type (width, TYPE_UNSIGNED (type));
5295 DECL_INITIAL (*fieldlistp) = 0;
5298 fieldlistp = &TREE_CHAIN (*fieldlistp);
5301 /* Now we have the truly final field list.
5302 Store it in this type and in the variants. */
5304 TYPE_FIELDS (t) = fieldlist;
5306 /* If there are lots of fields, sort so we can look through them fast.
5307 We arbitrarily consider 16 or more elts to be "a lot". */
5312 for (x = fieldlist; x; x = TREE_CHAIN (x))
5314 if (len > 15 || DECL_NAME (x) == NULL)
5322 struct lang_type *space;
5323 struct sorted_fields_type *space2;
5325 len += list_length (x);
5327 /* Use the same allocation policy here that make_node uses, to
5328 ensure that this lives as long as the rest of the struct decl.
5329 All decls in an inline function need to be saved. */
5331 space = GGC_CNEW (struct lang_type);
5332 space2 = GGC_NEWVAR (struct sorted_fields_type,
5333 sizeof (struct sorted_fields_type) + len * sizeof (tree));
5337 field_array = &space2->elts[0];
5338 for (x = fieldlist; x; x = TREE_CHAIN (x))
5340 field_array[len++] = x;
5342 /* If there is anonymous struct or union, break out of the loop. */
5343 if (DECL_NAME (x) == NULL)
5346 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5349 TYPE_LANG_SPECIFIC (t) = space;
5350 TYPE_LANG_SPECIFIC (t)->s->len = len;
5351 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5352 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5357 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5359 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5360 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5361 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5362 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5365 /* If this was supposed to be a transparent union, but we can't
5366 make it one, warn and turn off the flag. */
5367 if (TREE_CODE (t) == UNION_TYPE
5368 && TYPE_TRANSPARENT_UNION (t)
5369 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5371 TYPE_TRANSPARENT_UNION (t) = 0;
5372 warning ("union cannot be made transparent");
5375 /* If this structure or union completes the type of any previous
5376 variable declaration, lay it out and output its rtl. */
5377 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5381 tree decl = TREE_VALUE (x);
5382 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5383 layout_array_type (TREE_TYPE (decl));
5384 if (TREE_CODE (decl) != TYPE_DECL)
5386 layout_decl (decl, 0);
5387 if (c_dialect_objc ())
5388 objc_check_decl (decl);
5389 rest_of_decl_compilation (decl, toplevel, 0);
5394 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5396 /* Finish debugging output for this type. */
5397 rest_of_type_compilation (t, toplevel);
5399 /* If we're inside a function proper, i.e. not file-scope and not still
5400 parsing parameters, then arrange for the size of a variable sized type
5402 if (cur_stmt_list && variably_modified_type_p (t, NULL))
5403 add_stmt (build_stmt (DECL_EXPR, build_decl (TYPE_DECL, NULL, t)));
5408 /* Lay out the type T, and its element type, and so on. */
5411 layout_array_type (tree t)
5413 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5414 layout_array_type (TREE_TYPE (t));
5418 /* Begin compiling the definition of an enumeration type.
5419 NAME is its name (or null if anonymous).
5420 Returns the type object, as yet incomplete.
5421 Also records info about it so that build_enumerator
5422 may be used to declare the individual values as they are read. */
5425 start_enum (tree name)
5429 /* If this is the real definition for a previous forward reference,
5430 fill in the contents in the same object that used to be the
5431 forward reference. */
5434 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5436 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5438 enumtype = make_node (ENUMERAL_TYPE);
5439 pushtag (name, enumtype);
5442 if (C_TYPE_BEING_DEFINED (enumtype))
5443 error ("nested redefinition of %<enum %s%>", IDENTIFIER_POINTER (name));
5445 C_TYPE_BEING_DEFINED (enumtype) = 1;
5447 if (TYPE_VALUES (enumtype) != 0)
5449 /* This enum is a named one that has been declared already. */
5450 error ("redeclaration of %<enum %s%>", IDENTIFIER_POINTER (name));
5452 /* Completely replace its old definition.
5453 The old enumerators remain defined, however. */
5454 TYPE_VALUES (enumtype) = 0;
5457 enum_next_value = integer_zero_node;
5460 if (flag_short_enums)
5461 TYPE_PACKED (enumtype) = 1;
5466 /* After processing and defining all the values of an enumeration type,
5467 install their decls in the enumeration type and finish it off.
5468 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5469 and ATTRIBUTES are the specified attributes.
5470 Returns ENUMTYPE. */
5473 finish_enum (tree enumtype, tree values, tree attributes)
5476 tree minnode = 0, maxnode = 0;
5477 int precision, unsign;
5478 bool toplevel = (file_scope == current_scope);
5479 struct lang_type *lt;
5481 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5483 /* Calculate the maximum value of any enumerator in this type. */
5485 if (values == error_mark_node)
5486 minnode = maxnode = integer_zero_node;
5489 minnode = maxnode = TREE_VALUE (values);
5490 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5492 tree value = TREE_VALUE (pair);
5493 if (tree_int_cst_lt (maxnode, value))
5495 if (tree_int_cst_lt (value, minnode))
5500 /* Construct the final type of this enumeration. It is the same
5501 as one of the integral types - the narrowest one that fits, except
5502 that normally we only go as narrow as int - and signed iff any of
5503 the values are negative. */
5504 unsign = (tree_int_cst_sgn (minnode) >= 0);
5505 precision = MAX (min_precision (minnode, unsign),
5506 min_precision (maxnode, unsign));
5508 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5510 tem = c_common_type_for_size (precision, unsign);
5513 warning ("enumeration values exceed range of largest integer");
5514 tem = long_long_integer_type_node;
5518 tem = unsign ? unsigned_type_node : integer_type_node;
5520 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
5521 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
5522 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
5523 TYPE_SIZE (enumtype) = 0;
5525 /* If the precision of the type was specific with an attribute and it
5526 was too small, give an error. Otherwise, use it. */
5527 if (TYPE_PRECISION (enumtype))
5529 if (precision > TYPE_PRECISION (enumtype))
5530 error ("specified mode too small for enumeral values");
5533 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
5535 layout_type (enumtype);
5537 if (values != error_mark_node)
5539 /* Change the type of the enumerators to be the enum type. We
5540 need to do this irrespective of the size of the enum, for
5541 proper type checking. Replace the DECL_INITIALs of the
5542 enumerators, and the value slots of the list, with copies
5543 that have the enum type; they cannot be modified in place
5544 because they may be shared (e.g. integer_zero_node) Finally,
5545 change the purpose slots to point to the names of the decls. */
5546 for (pair = values; pair; pair = TREE_CHAIN (pair))
5548 tree enu = TREE_PURPOSE (pair);
5549 tree ini = DECL_INITIAL (enu);
5551 TREE_TYPE (enu) = enumtype;
5553 /* The ISO C Standard mandates enumerators to have type int,
5554 even though the underlying type of an enum type is
5555 unspecified. Here we convert any enumerators that fit in
5556 an int to type int, to avoid promotions to unsigned types
5557 when comparing integers with enumerators that fit in the
5558 int range. When -pedantic is given, build_enumerator()
5559 would have already taken care of those that don't fit. */
5560 if (int_fits_type_p (ini, integer_type_node))
5561 tem = integer_type_node;
5564 ini = convert (tem, ini);
5566 DECL_INITIAL (enu) = ini;
5567 TREE_PURPOSE (pair) = DECL_NAME (enu);
5568 TREE_VALUE (pair) = ini;
5571 TYPE_VALUES (enumtype) = values;
5574 /* Record the min/max values so that we can warn about bit-field
5575 enumerations that are too small for the values. */
5576 lt = GGC_CNEW (struct lang_type);
5577 lt->enum_min = minnode;
5578 lt->enum_max = maxnode;
5579 TYPE_LANG_SPECIFIC (enumtype) = lt;
5581 /* Fix up all variant types of this enum type. */
5582 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5584 if (tem == enumtype)
5586 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5587 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5588 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5589 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5590 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5591 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5592 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5593 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5594 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5595 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
5596 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
5599 /* Finish debugging output for this type. */
5600 rest_of_type_compilation (enumtype, toplevel);
5605 /* Build and install a CONST_DECL for one value of the
5606 current enumeration type (one that was begun with start_enum).
5607 Return a tree-list containing the CONST_DECL and its value.
5608 Assignment of sequential values by default is handled here. */
5611 build_enumerator (tree name, tree value)
5615 /* Validate and default VALUE. */
5617 /* Remove no-op casts from the value. */
5619 STRIP_TYPE_NOPS (value);
5623 /* Don't issue more errors for error_mark_node (i.e. an
5624 undeclared identifier) - just ignore the value expression. */
5625 if (value == error_mark_node)
5627 else if (TREE_CODE (value) != INTEGER_CST)
5629 error ("enumerator value for %qE is not an integer constant", name);
5634 value = default_conversion (value);
5635 constant_expression_warning (value);
5639 /* Default based on previous value. */
5640 /* It should no longer be possible to have NON_LVALUE_EXPR
5644 value = enum_next_value;
5646 error ("overflow in enumeration values");
5649 if (pedantic && !int_fits_type_p (value, integer_type_node))
5651 pedwarn ("ISO C restricts enumerator values to range of %<int%>");
5652 /* XXX This causes -pedantic to change the meaning of the program.
5653 Remove? -zw 2004-03-15 */
5654 value = convert (integer_type_node, value);
5657 /* Set basis for default for next value. */
5658 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5659 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5661 /* Now create a declaration for the enum value name. */
5663 type = TREE_TYPE (value);
5664 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5665 TYPE_PRECISION (integer_type_node)),
5666 (TYPE_PRECISION (type)
5667 >= TYPE_PRECISION (integer_type_node)
5668 && TYPE_UNSIGNED (type)));
5670 decl = build_decl (CONST_DECL, name, type);
5671 DECL_INITIAL (decl) = convert (type, value);
5674 return tree_cons (decl, value, NULL_TREE);
5678 /* Create the FUNCTION_DECL for a function definition.
5679 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5680 the declaration; they describe the function's name and the type it returns,
5681 but twisted together in a fashion that parallels the syntax of C.
5683 This function creates a binding context for the function body
5684 as well as setting up the FUNCTION_DECL in current_function_decl.
5686 Returns 1 on success. If the DECLARATOR is not suitable for a function
5687 (it defines a datum instead), we return 0, which tells
5688 yyparse to report a parse error. */
5691 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
5694 tree decl1, old_decl;
5695 tree restype, resdecl;
5697 current_function_returns_value = 0; /* Assume, until we see it does. */
5698 current_function_returns_null = 0;
5699 current_function_returns_abnormally = 0;
5700 warn_about_return_type = 0;
5701 current_extern_inline = 0;
5702 c_switch_stack = NULL;
5704 /* Indicate no valid break/continue context by setting these variables
5705 to some non-null, non-label value. We'll notice and emit the proper
5706 error message in c_finish_bc_stmt. */
5707 c_break_label = c_cont_label = size_zero_node;
5709 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL);
5711 /* If the declarator is not suitable for a function definition,
5712 cause a syntax error. */
5716 decl_attributes (&decl1, attributes, 0);
5718 if (DECL_DECLARED_INLINE_P (decl1)
5719 && DECL_UNINLINABLE (decl1)
5720 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5721 warning ("%Jinline function %qD given attribute noinline", decl1, decl1);
5723 announce_function (decl1);
5725 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5727 error ("return type is an incomplete type");
5728 /* Make it return void instead. */
5730 = build_function_type (void_type_node,
5731 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5734 if (warn_about_return_type)
5735 pedwarn_c99 ("return type defaults to %<int%>");
5737 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5738 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
5739 DECL_INITIAL (decl1) = error_mark_node;
5741 /* If this definition isn't a prototype and we had a prototype declaration
5742 before, copy the arg type info from that prototype. */
5743 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
5744 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5745 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
5746 TREE_TYPE (TREE_TYPE (old_decl)))
5747 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5749 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
5751 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
5754 /* Optionally warn of old-fashioned def with no previous prototype. */
5755 if (warn_strict_prototypes
5756 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5757 && C_DECL_ISNT_PROTOTYPE (old_decl))
5758 warning ("function declaration isn%'t a prototype");
5759 /* Optionally warn of any global def with no previous prototype. */
5760 else if (warn_missing_prototypes
5761 && TREE_PUBLIC (decl1)
5762 && !MAIN_NAME_P (DECL_NAME (decl1))
5763 && C_DECL_ISNT_PROTOTYPE (old_decl))
5764 warning ("%Jno previous prototype for %qD", decl1, decl1);
5765 /* Optionally warn of any def with no previous prototype
5766 if the function has already been used. */
5767 else if (warn_missing_prototypes
5768 && old_decl != 0 && TREE_USED (old_decl)
5769 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5770 warning ("%J%qD was used with no prototype before its definition",
5772 /* Optionally warn of any global def with no previous declaration. */
5773 else if (warn_missing_declarations
5774 && TREE_PUBLIC (decl1)
5776 && !MAIN_NAME_P (DECL_NAME (decl1)))
5777 warning ("%Jno previous declaration for %qD", decl1, decl1);
5778 /* Optionally warn of any def with no previous declaration
5779 if the function has already been used. */
5780 else if (warn_missing_declarations
5781 && old_decl != 0 && TREE_USED (old_decl)
5782 && C_DECL_IMPLICIT (old_decl))
5783 warning ("%J%qD was used with no declaration before its definition",
5786 /* This is a definition, not a reference.
5787 So normally clear DECL_EXTERNAL.
5788 However, `extern inline' acts like a declaration
5789 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5790 DECL_EXTERNAL (decl1) = current_extern_inline;
5792 /* This function exists in static storage.
5793 (This does not mean `static' in the C sense!) */
5794 TREE_STATIC (decl1) = 1;
5796 /* A nested function is not global. */
5797 if (current_function_decl != 0)
5798 TREE_PUBLIC (decl1) = 0;
5800 /* This is the earliest point at which we might know the assembler
5801 name of the function. Thus, if it's set before this, die horribly. */
5802 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
5804 /* If #pragma weak was used, mark the decl weak now. */
5805 if (current_scope == file_scope)
5806 maybe_apply_pragma_weak (decl1);
5808 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5809 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5814 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5815 != integer_type_node)
5816 pedwarn ("%Jreturn type of %qD is not %<int%>", decl1, decl1);
5818 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5819 args = TREE_CHAIN (args))
5821 tree type = args ? TREE_VALUE (args) : 0;
5823 if (type == void_type_node)
5830 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5831 pedwarn ("%Jfirst argument of %qD should be %<int%>",
5836 if (TREE_CODE (type) != POINTER_TYPE
5837 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5838 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5840 pedwarn ("%Jsecond argument of %qD should be %<char **%>",
5845 if (TREE_CODE (type) != POINTER_TYPE
5846 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5847 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5849 pedwarn ("%Jthird argument of %qD should probably be "
5850 "%<char **%>", decl1, decl1);
5855 /* It is intentional that this message does not mention the third
5856 argument because it's only mentioned in an appendix of the
5858 if (argct > 0 && (argct < 2 || argct > 3))
5859 pedwarn ("%J%qD takes only zero or two arguments", decl1, decl1);
5861 if (!TREE_PUBLIC (decl1))
5862 pedwarn ("%J%qD is normally a non-static function", decl1, decl1);
5865 /* Record the decl so that the function name is defined.
5866 If we already have a decl for this name, and it is a FUNCTION_DECL,
5867 use the old decl. */
5869 current_function_decl = pushdecl (decl1);
5872 declare_parm_level ();
5874 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5875 /* Promote the value to int before returning it. */
5876 if (c_promoting_integer_type_p (restype))
5878 /* It retains unsignedness if not really getting wider. */
5879 if (TYPE_UNSIGNED (restype)
5880 && (TYPE_PRECISION (restype)
5881 == TYPE_PRECISION (integer_type_node)))
5882 restype = unsigned_type_node;
5884 restype = integer_type_node;
5887 resdecl = build_decl (RESULT_DECL, NULL_TREE, restype);
5888 DECL_ARTIFICIAL (resdecl) = 1;
5889 DECL_IGNORED_P (resdecl) = 1;
5890 DECL_RESULT (current_function_decl) = resdecl;
5892 start_fname_decls ();
5897 /* Subroutine of store_parm_decls which handles new-style function
5898 definitions (prototype format). The parms already have decls, so we
5899 need only record them as in effect and complain if any redundant
5900 old-style parm decls were written. */
5902 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
5906 if (current_scope->bindings)
5908 error ("%Jold-style parameter declarations in prototyped "
5909 "function definition", fndecl);
5911 /* Get rid of the old-style declarations. */
5915 /* Don't issue this warning for nested functions, and don't issue this
5916 warning if we got here because ARG_INFO_TYPES was error_mark_node
5917 (this happens when a function definition has just an ellipsis in
5918 its parameter list). */
5919 else if (warn_traditional && !in_system_header && !current_function_scope
5920 && arg_info->types != error_mark_node)
5921 warning ("%Jtraditional C rejects ISO C style function definitions",
5924 /* Now make all the parameter declarations visible in the function body.
5925 We can bypass most of the grunt work of pushdecl. */
5926 for (decl = arg_info->parms; decl; decl = TREE_CHAIN (decl))
5928 DECL_CONTEXT (decl) = current_function_decl;
5929 if (DECL_NAME (decl))
5930 bind (DECL_NAME (decl), decl, current_scope,
5931 /*invisible=*/false, /*nested=*/false);
5933 error ("%Jparameter name omitted", decl);
5936 /* Record the parameter list in the function declaration. */
5937 DECL_ARGUMENTS (fndecl) = arg_info->parms;
5939 /* Now make all the ancillary declarations visible, likewise. */
5940 for (decl = arg_info->others; decl; decl = TREE_CHAIN (decl))
5942 DECL_CONTEXT (decl) = current_function_decl;
5943 if (DECL_NAME (decl))
5944 bind (DECL_NAME (decl), decl, current_scope,
5945 /*invisible=*/false, /*nested=*/false);
5948 /* And all the tag declarations. */
5949 for (decl = arg_info->tags; decl; decl = TREE_CHAIN (decl))
5950 if (TREE_PURPOSE (decl))
5951 bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope,
5952 /*invisible=*/false, /*nested=*/false);
5955 /* Subroutine of store_parm_decls which handles old-style function
5956 definitions (separate parameter list and declarations). */
5959 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
5961 struct c_binding *b;
5962 tree parm, decl, last;
5963 tree parmids = arg_info->parms;
5965 /* We use DECL_WEAK as a flag to show which parameters have been
5966 seen already, since it is not used on PARM_DECL. */
5967 #ifdef ENABLE_CHECKING
5968 for (b = current_scope->bindings; b; b = b->prev)
5969 gcc_assert (TREE_CODE (b->decl) != PARM_DECL || !DECL_WEAK (b->decl));
5972 if (warn_old_style_definition && !in_system_header)
5973 warning ("%Jold-style function definition", fndecl);
5975 /* Match each formal parameter name with its declaration. Save each
5976 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
5977 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
5979 if (TREE_VALUE (parm) == 0)
5981 error ("%Jparameter name missing from parameter list", fndecl);
5982 TREE_PURPOSE (parm) = 0;
5986 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
5987 if (b && B_IN_CURRENT_SCOPE (b))
5990 /* If we got something other than a PARM_DECL it is an error. */
5991 if (TREE_CODE (decl) != PARM_DECL)
5992 error ("%J%qD declared as a non-parameter", decl, decl);
5993 /* If the declaration is already marked, we have a duplicate
5994 name. Complain and ignore the duplicate. */
5995 else if (DECL_WEAK (decl))
5997 error ("%Jmultiple parameters named %qD", decl, decl);
5998 TREE_PURPOSE (parm) = 0;
6001 /* If the declaration says "void", complain and turn it into
6003 else if (VOID_TYPE_P (TREE_TYPE (decl)))
6005 error ("%Jparameter %qD declared with void type", decl, decl);
6006 TREE_TYPE (decl) = integer_type_node;
6007 DECL_ARG_TYPE (decl) = integer_type_node;
6008 layout_decl (decl, 0);
6011 /* If no declaration found, default to int. */
6014 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
6015 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
6016 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
6020 pedwarn ("%Jtype of %qD defaults to %<int%>", decl, decl);
6021 else if (extra_warnings)
6022 warning ("%Jtype of %qD defaults to %<int%>", decl, decl);
6025 TREE_PURPOSE (parm) = decl;
6026 DECL_WEAK (decl) = 1;
6029 /* Now examine the parms chain for incomplete declarations
6030 and declarations with no corresponding names. */
6032 for (b = current_scope->bindings; b; b = b->prev)
6035 if (TREE_CODE (parm) != PARM_DECL)
6038 if (TREE_TYPE (parm) != error_mark_node
6039 && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
6041 error ("%Jparameter %qD has incomplete type", parm, parm);
6042 TREE_TYPE (parm) = error_mark_node;
6045 if (!DECL_WEAK (parm))
6047 error ("%Jdeclaration for parameter %qD but no such parameter",
6050 /* Pretend the parameter was not missing.
6051 This gets us to a standard state and minimizes
6052 further error messages. */
6053 parmids = chainon (parmids, tree_cons (parm, 0, 0));
6057 /* Chain the declarations together in the order of the list of
6058 names. Store that chain in the function decl, replacing the
6059 list of names. Update the current scope to match. */
6060 DECL_ARGUMENTS (fndecl) = 0;
6062 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6063 if (TREE_PURPOSE (parm))
6065 if (parm && TREE_PURPOSE (parm))
6067 last = TREE_PURPOSE (parm);
6068 DECL_ARGUMENTS (fndecl) = last;
6069 DECL_WEAK (last) = 0;
6071 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
6072 if (TREE_PURPOSE (parm))
6074 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6075 last = TREE_PURPOSE (parm);
6076 DECL_WEAK (last) = 0;
6078 TREE_CHAIN (last) = 0;
6081 /* If there was a previous prototype,
6082 set the DECL_ARG_TYPE of each argument according to
6083 the type previously specified, and report any mismatches. */
6085 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6088 for (parm = DECL_ARGUMENTS (fndecl),
6089 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6090 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6091 != void_type_node));
6092 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6094 if (parm == 0 || type == 0
6095 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6097 error ("number of arguments doesn%'t match prototype");
6098 error ("%Hprototype declaration",
6099 ¤t_function_prototype_locus);
6102 /* Type for passing arg must be consistent with that
6103 declared for the arg. ISO C says we take the unqualified
6104 type for parameters declared with qualified type. */
6105 if (!comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6106 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6108 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6109 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6111 /* Adjust argument to match prototype. E.g. a previous
6112 `int foo(float);' prototype causes
6113 `int foo(x) float x; {...}' to be treated like
6114 `int foo(float x) {...}'. This is particularly
6115 useful for argument types like uid_t. */
6116 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6118 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
6119 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6120 && TYPE_PRECISION (TREE_TYPE (parm))
6121 < TYPE_PRECISION (integer_type_node))
6122 DECL_ARG_TYPE (parm) = integer_type_node;
6126 pedwarn ("promoted argument %qD "
6127 "doesn%'t match prototype", parm);
6128 pedwarn ("%Hprototype declaration",
6129 ¤t_function_prototype_locus);
6134 error ("argument %qD doesn%'t match prototype", parm);
6135 error ("%Hprototype declaration",
6136 ¤t_function_prototype_locus);
6140 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6143 /* Otherwise, create a prototype that would match. */
6147 tree actual = 0, last = 0, type;
6149 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6151 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6153 TREE_CHAIN (last) = type;
6158 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6160 TREE_CHAIN (last) = type;
6164 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6165 of the type of this function, but we need to avoid having this
6166 affect the types of other similarly-typed functions, so we must
6167 first force the generation of an identical (but separate) type
6168 node for the relevant function type. The new node we create
6169 will be a variant of the main variant of the original function
6172 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
6174 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6178 /* Store parameter declarations passed in ARG_INFO into the current
6179 function declaration. */
6182 store_parm_decls_from (struct c_arg_info *arg_info)
6184 current_function_arg_info = arg_info;
6185 store_parm_decls ();
6188 /* Store the parameter declarations into the current function declaration.
6189 This is called after parsing the parameter declarations, before
6190 digesting the body of the function.
6192 For an old-style definition, construct a prototype out of the old-style
6193 parameter declarations and inject it into the function's type. */
6196 store_parm_decls (void)
6198 tree fndecl = current_function_decl;
6201 /* The argument information block for FNDECL. */
6202 struct c_arg_info *arg_info = current_function_arg_info;
6203 current_function_arg_info = 0;
6205 /* True if this definition is written with a prototype. Note:
6206 despite C99 6.7.5.3p14, we can *not* treat an empty argument
6207 list in a function definition as equivalent to (void) -- an
6208 empty argument list specifies the function has no parameters,
6209 but only (void) sets up a prototype for future calls. */
6210 proto = arg_info->types != 0;
6213 store_parm_decls_newstyle (fndecl, arg_info);
6215 store_parm_decls_oldstyle (fndecl, arg_info);
6217 /* The next call to push_scope will be a function body. */
6219 next_is_function_body = true;
6221 /* Write a record describing this function definition to the prototypes
6222 file (if requested). */
6224 gen_aux_info_record (fndecl, 1, 0, proto);
6226 /* Initialize the RTL code for the function. */
6227 allocate_struct_function (fndecl);
6229 /* Begin the statement tree for this function. */
6230 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
6232 /* ??? Insert the contents of the pending sizes list into the function
6233 to be evaluated. The only reason left to have this is
6234 void foo(int n, int array[n++])
6235 because we throw away the array type in favor of a pointer type, and
6236 thus won't naturally see the SAVE_EXPR containing the increment. All
6237 other pending sizes would be handled by gimplify_parameters. */
6240 for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t))
6241 add_stmt (TREE_VALUE (t));
6244 /* Even though we're inside a function body, we still don't want to
6245 call expand_expr to calculate the size of a variable-sized array.
6246 We haven't necessarily assigned RTL to all variables yet, so it's
6247 not safe to try to expand expressions involving them. */
6248 cfun->x_dont_save_pending_sizes_p = 1;
6251 /* Handle attribute((warn_unused_result)) on FNDECL and all its nested
6255 c_warn_unused_result_recursively (tree fndecl)
6257 struct cgraph_node *cgn;
6259 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
6260 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
6262 /* Finalize all nested functions now. */
6263 cgn = cgraph_node (fndecl);
6264 for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested)
6265 c_warn_unused_result_recursively (cgn->decl);
6268 /* Finish up a function declaration and compile that function
6269 all the way to assembler language output. The free the storage
6270 for the function definition.
6272 This is called after parsing the body of the function definition. */
6275 finish_function (void)
6277 tree fndecl = current_function_decl;
6279 if (TREE_CODE (fndecl) == FUNCTION_DECL
6280 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6282 tree args = DECL_ARGUMENTS (fndecl);
6283 for (; args; args = TREE_CHAIN (args))
6285 tree type = TREE_TYPE (args);
6286 if (INTEGRAL_TYPE_P (type)
6287 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6288 DECL_ARG_TYPE (args) = integer_type_node;
6292 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6293 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6295 /* Must mark the RESULT_DECL as being in this function. */
6297 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
6298 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6300 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6302 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6303 != integer_type_node)
6305 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6306 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6308 pedwarn ("%Jreturn type of %qD is not %<int%>", fndecl, fndecl);
6313 c_finish_return (integer_zero_node);
6317 /* Tie off the statement tree for this function. */
6318 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
6320 finish_fname_decls ();
6322 /* Complain if there's just no return statement. */
6323 if (warn_return_type
6324 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6325 && !current_function_returns_value && !current_function_returns_null
6326 /* Don't complain if we abort. */
6327 && !current_function_returns_abnormally
6328 /* Don't warn for main(). */
6329 && !MAIN_NAME_P (DECL_NAME (fndecl))
6330 /* Or if they didn't actually specify a return type. */
6331 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6332 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6333 inline function, as we might never be compiled separately. */
6334 && DECL_INLINE (fndecl))
6335 warning ("no return statement in function returning non-void");
6337 /* With just -Wextra, complain only if function returns both with
6338 and without a value. */
6340 && current_function_returns_value
6341 && current_function_returns_null)
6342 warning ("this function may return with or without a value");
6344 /* Store the end of the function, so that we get good line number
6345 info for the epilogue. */
6346 cfun->function_end_locus = input_location;
6348 /* If we don't have ctors/dtors sections, and this is a static
6349 constructor or destructor, it must be recorded now. */
6350 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6351 && !targetm.have_ctors_dtors)
6352 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6353 if (DECL_STATIC_DESTRUCTOR (fndecl)
6354 && !targetm.have_ctors_dtors)
6355 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6357 /* Finalize the ELF visibility for the function. */
6358 c_determine_visibility (fndecl);
6360 /* Genericize before inlining. Delay genericizing nested functions
6361 until their parent function is genericized. Since finalizing
6362 requires GENERIC, delay that as well. */
6364 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6366 if (!decl_function_context (fndecl))
6368 c_genericize (fndecl);
6369 c_warn_unused_result_recursively (fndecl);
6371 /* ??? Objc emits functions after finalizing the compilation unit.
6372 This should be cleaned up later and this conditional removed. */
6373 if (cgraph_global_info_ready)
6375 c_expand_body (fndecl);
6379 cgraph_finalize_function (fndecl, false);
6383 /* Register this function with cgraph just far enough to get it
6384 added to our parent's nested function list. Handy, since the
6385 C front end doesn't have such a list. */
6386 (void) cgraph_node (fndecl);
6390 /* We're leaving the context of this function, so zap cfun.
6391 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
6392 tree_rest_of_compilation. */
6394 current_function_decl = NULL;
6397 /* Generate the RTL for the body of FNDECL. */
6400 c_expand_body (tree fndecl)
6403 if (!DECL_INITIAL (fndecl)
6404 || DECL_INITIAL (fndecl) == error_mark_node)
6407 tree_rest_of_compilation (fndecl);
6409 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6410 && targetm.have_ctors_dtors)
6411 targetm.asm_out.constructor (XEXP (DECL_RTL (fndecl), 0),
6412 DEFAULT_INIT_PRIORITY);
6413 if (DECL_STATIC_DESTRUCTOR (fndecl)
6414 && targetm.have_ctors_dtors)
6415 targetm.asm_out.destructor (XEXP (DECL_RTL (fndecl), 0),
6416 DEFAULT_INIT_PRIORITY);
6419 /* Check the declarations given in a for-loop for satisfying the C99
6422 check_for_loop_decls (void)
6424 struct c_binding *b;
6428 /* If we get here, declarations have been used in a for loop without
6429 the C99 for loop scope. This doesn't make much sense, so don't
6431 error ("%<for%> loop initial declaration used outside C99 mode");
6434 /* C99 subclause 6.8.5 paragraph 3:
6436 [#3] The declaration part of a for statement shall only
6437 declare identifiers for objects having storage class auto or
6440 It isn't clear whether, in this sentence, "identifiers" binds to
6441 "shall only declare" or to "objects" - that is, whether all identifiers
6442 declared must be identifiers for objects, or whether the restriction
6443 only applies to those that are. (A question on this in comp.std.c
6444 in November 2000 received no answer.) We implement the strictest
6445 interpretation, to avoid creating an extension which later causes
6448 for (b = current_scope->bindings; b; b = b->prev)
6451 tree decl = b->decl;
6456 switch (TREE_CODE (decl))
6459 if (TREE_STATIC (decl))
6460 error ("%Jdeclaration of static variable %qD in %<for%> loop "
6461 "initial declaration", decl, decl);
6462 else if (DECL_EXTERNAL (decl))
6463 error ("%Jdeclaration of %<extern%> variable %qD in %<for%> loop "
6464 "initial declaration", decl, decl);
6468 error ("%<struct %E%> declared in %<for%> loop initial declaration",
6472 error ("%<union %E%> declared in %<for%> loop initial declaration",
6476 error ("%<enum %E%> declared in %<for%> loop initial declaration",
6480 error ("%Jdeclaration of non-variable %qD in %<for%> loop "
6481 "initial declaration", decl, decl);
6486 /* Save and reinitialize the variables
6487 used during compilation of a C function. */
6490 c_push_function_context (struct function *f)
6492 struct language_function *p;
6493 p = GGC_NEW (struct language_function);
6496 p->base.x_stmt_tree = c_stmt_tree;
6497 p->x_break_label = c_break_label;
6498 p->x_cont_label = c_cont_label;
6499 p->x_switch_stack = c_switch_stack;
6500 p->arg_info = current_function_arg_info;
6501 p->returns_value = current_function_returns_value;
6502 p->returns_null = current_function_returns_null;
6503 p->returns_abnormally = current_function_returns_abnormally;
6504 p->warn_about_return_type = warn_about_return_type;
6505 p->extern_inline = current_extern_inline;
6508 /* Restore the variables used during compilation of a C function. */
6511 c_pop_function_context (struct function *f)
6513 struct language_function *p = f->language;
6515 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
6516 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6518 /* Stop pointing to the local nodes about to be freed. */
6519 /* But DECL_INITIAL must remain nonzero so we know this
6520 was an actual function definition. */
6521 DECL_INITIAL (current_function_decl) = error_mark_node;
6522 DECL_ARGUMENTS (current_function_decl) = 0;
6525 c_stmt_tree = p->base.x_stmt_tree;
6526 c_break_label = p->x_break_label;
6527 c_cont_label = p->x_cont_label;
6528 c_switch_stack = p->x_switch_stack;
6529 current_function_arg_info = p->arg_info;
6530 current_function_returns_value = p->returns_value;
6531 current_function_returns_null = p->returns_null;
6532 current_function_returns_abnormally = p->returns_abnormally;
6533 warn_about_return_type = p->warn_about_return_type;
6534 current_extern_inline = p->extern_inline;
6539 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6542 c_dup_lang_specific_decl (tree decl)
6544 struct lang_decl *ld;
6546 if (!DECL_LANG_SPECIFIC (decl))
6549 ld = GGC_NEW (struct lang_decl);
6550 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6551 DECL_LANG_SPECIFIC (decl) = ld;
6554 /* The functions below are required for functionality of doing
6555 function at once processing in the C front end. Currently these
6556 functions are not called from anywhere in the C front end, but as
6557 these changes continue, that will change. */
6559 /* Returns nonzero if the current statement is a full expression,
6560 i.e. temporaries created during that statement should be destroyed
6561 at the end of the statement. */
6564 stmts_are_full_exprs_p (void)
6569 /* Returns the stmt_tree (if any) to which statements are currently
6570 being added. If there is no active statement-tree, NULL is
6574 current_stmt_tree (void)
6576 return &c_stmt_tree;
6579 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6583 anon_aggr_type_p (tree ARG_UNUSED (node))
6588 /* Return the global value of T as a symbol. */
6591 identifier_global_value (tree t)
6593 struct c_binding *b;
6595 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
6596 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
6602 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6603 otherwise the name is found in ridpointers from RID_INDEX. */
6606 record_builtin_type (enum rid rid_index, const char *name, tree type)
6610 id = ridpointers[(int) rid_index];
6612 id = get_identifier (name);
6613 decl = build_decl (TYPE_DECL, id, type);
6615 if (debug_hooks->type_decl)
6616 debug_hooks->type_decl (decl, false);
6619 /* Build the void_list_node (void_type_node having been created). */
6621 build_void_list_node (void)
6623 tree t = build_tree_list (NULL_TREE, void_type_node);
6627 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
6630 build_c_parm (struct c_declspecs *specs, tree attrs,
6631 struct c_declarator *declarator)
6633 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
6636 ret->declarator = declarator;
6640 /* Return a declarator with nested attributes. TARGET is the inner
6641 declarator to which these attributes apply. ATTRS are the
6644 struct c_declarator *
6645 build_attrs_declarator (tree attrs, struct c_declarator *target)
6647 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6648 ret->kind = cdk_attrs;
6649 ret->declarator = target;
6650 ret->u.attrs = attrs;
6654 /* Return a declarator for a function with arguments specified by ARGS
6655 and return type specified by TARGET. */
6657 struct c_declarator *
6658 build_function_declarator (struct c_arg_info *args,
6659 struct c_declarator *target)
6661 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6662 ret->kind = cdk_function;
6663 ret->declarator = target;
6664 ret->u.arg_info = args;
6668 /* Return a declarator for the identifier IDENT (which may be
6669 NULL_TREE for an abstract declarator). */
6671 struct c_declarator *
6672 build_id_declarator (tree ident)
6674 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6676 ret->declarator = 0;
6681 /* Return something to represent absolute declarators containing a *.
6682 TARGET is the absolute declarator that the * contains.
6683 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
6684 to apply to the pointer type. */
6686 struct c_declarator *
6687 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
6688 struct c_declarator *target)
6692 struct c_declarator *itarget = target;
6693 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
6694 if (type_quals_attrs)
6696 attrs = type_quals_attrs->attrs;
6697 quals = quals_from_declspecs (type_quals_attrs);
6698 if (attrs != NULL_TREE)
6699 itarget = build_attrs_declarator (attrs, target);
6701 ret->kind = cdk_pointer;
6702 ret->declarator = itarget;
6703 ret->u.pointer_quals = quals;
6707 /* Return a pointer to a structure for an empty list of declaration
6710 struct c_declspecs *
6711 build_null_declspecs (void)
6713 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
6717 ret->typespec_word = cts_none;
6718 ret->storage_class = csc_none;
6719 ret->non_sc_seen_p = false;
6720 ret->typedef_p = false;
6721 ret->tag_defined_p = false;
6722 ret->explicit_signed_p = false;
6723 ret->deprecated_p = false;
6724 ret->default_int_p = false;
6725 ret->long_p = false;
6726 ret->long_long_p = false;
6727 ret->short_p = false;
6728 ret->signed_p = false;
6729 ret->unsigned_p = false;
6730 ret->complex_p = false;
6731 ret->inline_p = false;
6732 ret->thread_p = false;
6733 ret->const_p = false;
6734 ret->volatile_p = false;
6735 ret->restrict_p = false;
6739 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
6742 struct c_declspecs *
6743 declspecs_add_qual (struct c_declspecs *specs, tree qual)
6747 specs->non_sc_seen_p = true;
6748 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
6749 && C_IS_RESERVED_WORD (qual));
6750 i = C_RID_CODE (qual);
6754 dupe = specs->const_p;
6755 specs->const_p = true;
6758 dupe = specs->volatile_p;
6759 specs->volatile_p = true;
6762 dupe = specs->restrict_p;
6763 specs->restrict_p = true;
6768 if (dupe && pedantic && !flag_isoc99)
6769 pedwarn ("duplicate %qs", IDENTIFIER_POINTER (qual));
6773 /* Add the type specifier TYPE to the declaration specifiers SPECS,
6776 struct c_declspecs *
6777 declspecs_add_type (struct c_declspecs *specs, struct c_typespec spec)
6779 tree type = spec.spec;
6780 specs->non_sc_seen_p = true;
6781 if (TREE_DEPRECATED (type))
6782 specs->deprecated_p = true;
6784 /* Handle type specifier keywords. */
6785 if (TREE_CODE (type) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (type))
6787 enum rid i = C_RID_CODE (type);
6790 error ("two or more data types in declaration specifiers");
6793 if ((int) i <= (int) RID_LAST_MODIFIER)
6795 /* "long", "short", "signed", "unsigned" or "_Complex". */
6800 if (specs->long_long_p)
6802 error ("%<long long long%> is too long for GCC");
6807 if (specs->typespec_word == cts_double)
6809 error ("both %<long long%> and %<double%> in "
6810 "declaration specifiers");
6813 if (pedantic && !flag_isoc99 && !in_system_header
6815 pedwarn ("ISO C90 does not support %<long long%>");
6816 specs->long_long_p = 1;
6820 error ("both %<long%> and %<short%> in "
6821 "declaration specifiers");
6822 else if (specs->typespec_word == cts_void)
6823 error ("both %<long%> and %<void%> in "
6824 "declaration specifiers");
6825 else if (specs->typespec_word == cts_bool)
6826 error ("both %<long%> and %<_Bool%> in "
6827 "declaration specifiers");
6828 else if (specs->typespec_word == cts_char)
6829 error ("both %<long%> and %<char%> in "
6830 "declaration specifiers");
6831 else if (specs->typespec_word == cts_float)
6832 error ("both %<long%> and %<float%> in "
6833 "declaration specifiers");
6835 specs->long_p = true;
6838 dupe = specs->short_p;
6840 error ("both %<long%> and %<short%> in "
6841 "declaration specifiers");
6842 else if (specs->typespec_word == cts_void)
6843 error ("both %<short%> and %<void%> in "
6844 "declaration specifiers");
6845 else if (specs->typespec_word == cts_bool)
6846 error ("both %<short%> and %<_Bool%> in "
6847 "declaration specifiers");
6848 else if (specs->typespec_word == cts_char)
6849 error ("both %<short%> and %<char%> in "
6850 "declaration specifiers");
6851 else if (specs->typespec_word == cts_float)
6852 error ("both %<short%> and %<float%> in "
6853 "declaration specifiers");
6854 else if (specs->typespec_word == cts_double)
6855 error ("both %<short%> and %<double%> in "
6856 "declaration specifiers");
6858 specs->short_p = true;
6861 dupe = specs->signed_p;
6862 if (specs->unsigned_p)
6863 error ("both %<signed%> and %<unsigned%> in "
6864 "declaration specifiers");
6865 else if (specs->typespec_word == cts_void)
6866 error ("both %<signed%> and %<void%> in "
6867 "declaration specifiers");
6868 else if (specs->typespec_word == cts_bool)
6869 error ("both %<signed%> and %<_Bool%> in "
6870 "declaration specifiers");
6871 else if (specs->typespec_word == cts_float)
6872 error ("both %<signed%> and %<float%> in "
6873 "declaration specifiers");
6874 else if (specs->typespec_word == cts_double)
6875 error ("both %<signed%> and %<double%> in "
6876 "declaration specifiers");
6878 specs->signed_p = true;
6881 dupe = specs->unsigned_p;
6882 if (specs->signed_p)
6883 error ("both %<signed%> and %<unsigned%> in "
6884 "declaration specifiers");
6885 else if (specs->typespec_word == cts_void)
6886 error ("both %<unsigned%> and %<void%> in "
6887 "declaration specifiers");
6888 else if (specs->typespec_word == cts_bool)
6889 error ("both %<unsigned%> and %<_Bool%> in "
6890 "declaration specifiers");
6891 else if (specs->typespec_word == cts_float)
6892 error ("both %<unsigned%> and %<float%> in "
6893 "declaration specifiers");
6894 else if (specs->typespec_word == cts_double)
6895 error ("both %<unsigned%> and %<double%> in "
6896 "declaration specifiers");
6898 specs->unsigned_p = true;
6901 dupe = specs->complex_p;
6902 if (pedantic && !flag_isoc99 && !in_system_header)
6903 pedwarn ("ISO C90 does not support complex types");
6904 if (specs->typespec_word == cts_void)
6905 error ("both %<complex%> and %<void%> in "
6906 "declaration specifiers");
6907 else if (specs->typespec_word == cts_bool)
6908 error ("both %<complex%> and %<_Bool%> in "
6909 "declaration specifiers");
6911 specs->complex_p = true;
6918 error ("duplicate %qs", IDENTIFIER_POINTER (type));
6924 /* "void", "_Bool", "char", "int", "float" or "double". */
6925 if (specs->typespec_word != cts_none)
6927 error ("two or more data types in declaration specifiers");
6934 error ("both %<long%> and %<void%> in "
6935 "declaration specifiers");
6936 else if (specs->short_p)
6937 error ("both %<short%> and %<void%> in "
6938 "declaration specifiers");
6939 else if (specs->signed_p)
6940 error ("both %<signed%> and %<void%> in "
6941 "declaration specifiers");
6942 else if (specs->unsigned_p)
6943 error ("both %<unsigned%> and %<void%> in "
6944 "declaration specifiers");
6945 else if (specs->complex_p)
6946 error ("both %<complex%> and %<void%> in "
6947 "declaration specifiers");
6949 specs->typespec_word = cts_void;
6953 error ("both %<long%> and %<_Bool%> in "
6954 "declaration specifiers");
6955 else if (specs->short_p)
6956 error ("both %<short%> and %<_Bool%> in "
6957 "declaration specifiers");
6958 else if (specs->signed_p)
6959 error ("both %<signed%> and %<_Bool%> in "
6960 "declaration specifiers");
6961 else if (specs->unsigned_p)
6962 error ("both %<unsigned%> and %<_Bool%> in "
6963 "declaration specifiers");
6964 else if (specs->complex_p)
6965 error ("both %<complex%> and %<_Bool%> in "
6966 "declaration specifiers");
6968 specs->typespec_word = cts_bool;
6972 error ("both %<long%> and %<char%> in "
6973 "declaration specifiers");
6974 else if (specs->short_p)
6975 error ("both %<short%> and %<char%> in "
6976 "declaration specifiers");
6978 specs->typespec_word = cts_char;
6981 specs->typespec_word = cts_int;
6985 error ("both %<long%> and %<float%> in "
6986 "declaration specifiers");
6987 else if (specs->short_p)
6988 error ("both %<short%> and %<float%> in "
6989 "declaration specifiers");
6990 else if (specs->signed_p)
6991 error ("both %<signed%> and %<float%> in "
6992 "declaration specifiers");
6993 else if (specs->unsigned_p)
6994 error ("both %<unsigned%> and %<float%> in "
6995 "declaration specifiers");
6997 specs->typespec_word = cts_float;
7000 if (specs->long_long_p)
7001 error ("both %<long long%> and %<double%> in "
7002 "declaration specifiers");
7003 else if (specs->short_p)
7004 error ("both %<short%> and %<double%> in "
7005 "declaration specifiers");
7006 else if (specs->signed_p)
7007 error ("both %<signed%> and %<double%> in "
7008 "declaration specifiers");
7009 else if (specs->unsigned_p)
7010 error ("both %<unsigned%> and %<double%> in "
7011 "declaration specifiers");
7013 specs->typespec_word = cts_double;
7016 /* ObjC reserved word "id", handled below. */
7022 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
7023 form of ObjC type, cases such as "int" and "long" being handled
7024 above), a TYPE (struct, union, enum and typeof specifiers) or an
7025 ERROR_MARK. In none of these cases may there have previously
7026 been any type specifiers. */
7027 if (specs->type || specs->typespec_word != cts_none
7028 || specs->long_p || specs->short_p || specs->signed_p
7029 || specs->unsigned_p || specs->complex_p)
7030 error ("two or more data types in declaration specifiers");
7031 else if (TREE_CODE (type) == TYPE_DECL)
7033 if (TREE_TYPE (type) == error_mark_node)
7034 ; /* Allow the type to default to int to avoid cascading errors. */
7037 specs->type = TREE_TYPE (type);
7038 specs->decl_attr = DECL_ATTRIBUTES (type);
7039 specs->typedef_p = true;
7040 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
7043 else if (TREE_CODE (type) == IDENTIFIER_NODE)
7045 tree t = lookup_name (type);
7046 if (!t || TREE_CODE (t) != TYPE_DECL)
7047 error ("%qs fails to be a typedef or built in type",
7048 IDENTIFIER_POINTER (type));
7049 else if (TREE_TYPE (t) == error_mark_node)
7052 specs->type = TREE_TYPE (t);
7054 else if (TREE_CODE (type) != ERROR_MARK)
7056 if (spec.kind == ctsk_tagdef || spec.kind == ctsk_tagfirstref)
7057 specs->tag_defined_p = true;
7058 if (spec.kind == ctsk_typeof)
7059 specs->typedef_p = true;
7066 /* Add the storage class specifier or function specifier SCSPEC to the
7067 declaration specifiers SPECS, returning SPECS. */
7069 struct c_declspecs *
7070 declspecs_add_scspec (struct c_declspecs *specs, tree scspec)
7073 enum c_storage_class n = csc_none;
7075 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
7076 && C_IS_RESERVED_WORD (scspec));
7077 i = C_RID_CODE (scspec);
7078 if (extra_warnings && specs->non_sc_seen_p)
7079 warning ("%qs is not at beginning of declaration",
7080 IDENTIFIER_POINTER (scspec));
7084 /* C99 permits duplicate inline. Although of doubtful utility,
7085 it seems simplest to permit it in gnu89 mode as well, as
7086 there is also little utility in maintaining this as a
7087 difference between gnu89 and C99 inline. */
7089 specs->inline_p = true;
7092 dupe = specs->thread_p;
7093 if (specs->storage_class == csc_auto)
7094 error ("%<__thread%> used with %<auto%>");
7095 else if (specs->storage_class == csc_register)
7096 error ("%<__thread%> used with %<register%>");
7097 else if (specs->storage_class == csc_typedef)
7098 error ("%<__thread%> used with %<typedef%>");
7100 specs->thread_p = true;
7107 /* Diagnose "__thread extern". */
7108 if (specs->thread_p)
7109 error ("%<__thread%> before %<extern%>");
7116 /* Diagnose "__thread static". */
7117 if (specs->thread_p)
7118 error ("%<__thread%> before %<static%>");
7126 if (n != csc_none && n == specs->storage_class)
7129 error ("duplicate %qs", IDENTIFIER_POINTER (scspec));
7132 if (specs->storage_class != csc_none && n != specs->storage_class)
7134 error ("multiple storage classes in declaration specifiers");
7138 specs->storage_class = n;
7139 if (n != csc_extern && n != csc_static && specs->thread_p)
7141 error ("%<__thread%> used with %qs",
7142 IDENTIFIER_POINTER (scspec));
7143 specs->thread_p = false;
7150 /* Add the attributes ATTRS to the declaration specifiers SPECS,
7153 struct c_declspecs *
7154 declspecs_add_attrs (struct c_declspecs *specs, tree attrs)
7156 specs->attrs = chainon (attrs, specs->attrs);
7160 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
7161 specifiers with any other type specifier to determine the resulting
7162 type. This is where ISO C checks on complex types are made, since
7163 "_Complex long" is a prefix of the valid ISO C type "_Complex long
7166 struct c_declspecs *
7167 finish_declspecs (struct c_declspecs *specs)
7169 /* If a type was specified as a whole, we have no modifiers and are
7171 if (specs->type != NULL_TREE)
7173 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
7174 && !specs->signed_p && !specs->unsigned_p
7175 && !specs->complex_p);
7179 /* If none of "void", "_Bool", "char", "int", "float" or "double"
7180 has been specified, treat it as "int" unless "_Complex" is
7181 present and there are no other specifiers. If we just have
7182 "_Complex", it is equivalent to "_Complex double", but e.g.
7183 "_Complex short" is equivalent to "_Complex short int". */
7184 if (specs->typespec_word == cts_none)
7186 if (specs->long_p || specs->short_p
7187 || specs->signed_p || specs->unsigned_p)
7189 specs->typespec_word = cts_int;
7191 else if (specs->complex_p)
7193 specs->typespec_word = cts_double;
7195 pedwarn ("ISO C does not support plain %<complex%> meaning "
7196 "%<double complex%>");
7200 specs->typespec_word = cts_int;
7201 specs->default_int_p = true;
7202 /* We don't diagnose this here because grokdeclarator will
7203 give more specific diagnostics according to whether it is
7204 a function definition. */
7208 /* If "signed" was specified, record this to distinguish "int" and
7209 "signed int" in the case of a bit-field with
7210 -funsigned-bitfields. */
7211 specs->explicit_signed_p = specs->signed_p;
7213 /* Now compute the actual type. */
7214 switch (specs->typespec_word)
7217 gcc_assert (!specs->long_p && !specs->short_p
7218 && !specs->signed_p && !specs->unsigned_p
7219 && !specs->complex_p);
7220 specs->type = void_type_node;
7223 gcc_assert (!specs->long_p && !specs->short_p
7224 && !specs->signed_p && !specs->unsigned_p
7225 && !specs->complex_p);
7226 specs->type = boolean_type_node;
7229 gcc_assert (!specs->long_p && !specs->short_p);
7230 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7231 if (specs->signed_p)
7232 specs->type = signed_char_type_node;
7233 else if (specs->unsigned_p)
7234 specs->type = unsigned_char_type_node;
7236 specs->type = char_type_node;
7237 if (specs->complex_p)
7240 pedwarn ("ISO C does not support complex integer types");
7241 specs->type = build_complex_type (specs->type);
7245 gcc_assert (!(specs->long_p && specs->short_p));
7246 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7247 if (specs->long_long_p)
7248 specs->type = (specs->unsigned_p
7249 ? long_long_unsigned_type_node
7250 : long_long_integer_type_node);
7251 else if (specs->long_p)
7252 specs->type = (specs->unsigned_p
7253 ? long_unsigned_type_node
7254 : long_integer_type_node);
7255 else if (specs->short_p)
7256 specs->type = (specs->unsigned_p
7257 ? short_unsigned_type_node
7258 : short_integer_type_node);
7260 specs->type = (specs->unsigned_p
7261 ? unsigned_type_node
7262 : integer_type_node);
7263 if (specs->complex_p)
7266 pedwarn ("ISO C does not support complex integer types");
7267 specs->type = build_complex_type (specs->type);
7271 gcc_assert (!specs->long_p && !specs->short_p
7272 && !specs->signed_p && !specs->unsigned_p);
7273 specs->type = (specs->complex_p
7274 ? complex_float_type_node
7278 gcc_assert (!specs->long_long_p && !specs->short_p
7279 && !specs->signed_p && !specs->unsigned_p);
7282 specs->type = (specs->complex_p
7283 ? complex_long_double_type_node
7284 : long_double_type_node);
7288 specs->type = (specs->complex_p
7289 ? complex_double_type_node
7290 : double_type_node);
7300 /* Synthesize a function which calls all the global ctors or global
7301 dtors in this file. This is only used for targets which do not
7302 support .ctors/.dtors sections. FIXME: Migrate into cgraph. */
7304 build_cdtor (int method_type, tree cdtors)
7311 for (; cdtors; cdtors = TREE_CHAIN (cdtors))
7312 append_to_statement_list (build_function_call (TREE_VALUE (cdtors), 0),
7315 cgraph_build_static_cdtor (method_type, body, DEFAULT_INIT_PRIORITY);
7318 /* Perform final processing on one file scope's declarations (or the
7319 external scope's declarations), GLOBALS. */
7321 c_write_global_declarations_1 (tree globals)
7323 size_t len = list_length (globals);
7324 tree *vec = XNEWVEC (tree, len);
7328 /* Process the decls in the order they were written. */
7329 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
7332 /* Check for used but undefined static functions using the C
7333 standard's definition of "used", and set TREE_NO_WARNING so
7334 that check_global_declarations doesn't repeat the check. */
7335 if (TREE_CODE (decl) == FUNCTION_DECL
7336 && DECL_INITIAL (decl) == 0
7337 && DECL_EXTERNAL (decl)
7338 && !TREE_PUBLIC (decl)
7339 && C_DECL_USED (decl))
7341 pedwarn ("%J%qF used but never defined", decl, decl);
7342 TREE_NO_WARNING (decl) = 1;
7346 wrapup_global_declarations (vec, len);
7347 check_global_declarations (vec, len);
7353 c_write_global_declarations (void)
7357 /* We don't want to do this if generating a PCH. */
7361 /* Don't waste time on further processing if -fsyntax-only or we've
7362 encountered errors. */
7363 if (flag_syntax_only || errorcount || sorrycount || cpp_errors (parse_in))
7366 /* Close the external scope. */
7367 ext_block = pop_scope ();
7369 gcc_assert (!current_scope);
7371 /* Process all file scopes in this compilation, and the external_scope,
7372 through wrapup_global_declarations and check_global_declarations. */
7373 for (t = all_translation_units; t; t = TREE_CHAIN (t))
7374 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
7375 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
7377 /* Generate functions to call static constructors and destructors
7378 for targets that do not support .ctors/.dtors sections. These
7379 functions have magic names which are detected by collect2. */
7380 build_cdtor ('I', static_ctors); static_ctors = 0;
7381 build_cdtor ('D', static_dtors); static_dtors = 0;
7383 /* We're done parsing; proceed to optimize and emit assembly.
7384 FIXME: shouldn't be the front end's responsibility to call this. */
7388 #include "gt-c-decl.h"