1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
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, 51 Franklin Street, Fifth Floor, Boston, MA
23 /* Merged C99 inline changes from gcc trunk 122565 2007-03-05 */
24 /* Fixed problems with compiling inline-25.c and inline-26.c */
25 /* XXX still fails inline-29.c, inline-31.c, and inline-32.c */
27 /* Process declarations and symbol lookup for C front end.
28 Also constructs types; the standard scalar types at initialization,
29 and structure, union, array and enum types when they are declared. */
31 /* ??? not all decl nodes are given the most useful possible
32 line numbers. For example, the CONST_DECLs for enum values. */
36 #include "coretypes.h"
41 #include "tree-inline.h"
58 #include "langhooks.h"
59 #include "tree-mudflap.h"
60 #include "tree-gimple.h"
61 #include "diagnostic.h"
62 #include "tree-dump.h"
67 #include "langhooks-def.h"
68 #include "pointer-set.h"
70 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
72 { NORMAL, /* Ordinary declaration */
73 FUNCDEF, /* Function definition */
74 PARM, /* Declaration of parm before function body */
75 FIELD, /* Declaration inside struct or union */
76 TYPENAME}; /* Typename (inside cast or sizeof) */
79 /* Nonzero if we have seen an invalid cross reference
80 to a struct, union, or enum, but not yet printed the message. */
81 tree pending_invalid_xref;
83 /* File and line to appear in the eventual error message. */
84 location_t pending_invalid_xref_location;
86 /* True means we've initialized exception handling. */
87 bool c_eh_initialized_p;
89 /* While defining an enum type, this is 1 plus the last enumerator
90 constant value. Note that will do not have to save this or `enum_overflow'
91 around nested function definition since such a definition could only
92 occur in an enum value expression and we don't use these variables in
95 static tree enum_next_value;
97 /* Nonzero means that there was overflow computing enum_next_value. */
99 static int enum_overflow;
101 /* The file and line that the prototype came from if this is an
102 old-style definition; used for diagnostics in
103 store_parm_decls_oldstyle. */
105 static location_t current_function_prototype_locus;
107 /* Whether this prototype was built-in. */
109 static bool current_function_prototype_built_in;
111 /* The argument type information of this prototype. */
113 static tree current_function_prototype_arg_types;
115 /* The argument information structure for the function currently being
118 static struct c_arg_info *current_function_arg_info;
120 /* The obstack on which parser and related data structures, which are
121 not live beyond their top-level declaration or definition, are
123 struct obstack parser_obstack;
125 /* The current statement tree. */
127 static GTY(()) struct stmt_tree_s c_stmt_tree;
129 /* State saving variables. */
133 /* Linked list of TRANSLATION_UNIT_DECLS for the translation units
134 included in this invocation. Note that the current translation
135 unit is not included in this list. */
137 static GTY(()) tree all_translation_units;
139 /* A list of decls to be made automatically visible in each file scope. */
140 static GTY(()) tree visible_builtins;
142 /* Set to 0 at beginning of a function definition, set to 1 if
143 a return statement that specifies a return value is seen. */
145 int current_function_returns_value;
147 /* Set to 0 at beginning of a function definition, set to 1 if
148 a return statement with no argument is seen. */
150 int current_function_returns_null;
152 /* Set to 0 at beginning of a function definition, set to 1 if
153 a call to a noreturn function is seen. */
155 int current_function_returns_abnormally;
157 /* Set to nonzero by `grokdeclarator' for a function
158 whose return type is defaulted, if warnings for this are desired. */
160 static int warn_about_return_type;
162 /* Nonzero when the current toplevel function contains a declaration
163 of a nested function which is never defined. */
165 static bool undef_nested_function;
167 /* True means global_bindings_p should return false even if the scope stack
168 says we are in file scope. */
169 bool c_override_global_bindings_to_false;
172 /* Each c_binding structure describes one binding of an identifier to
173 a decl. All the decls in a scope - irrespective of namespace - are
174 chained together by the ->prev field, which (as the name implies)
175 runs in reverse order. All the decls in a given namespace bound to
176 a given identifier are chained by the ->shadowed field, which runs
177 from inner to outer scopes.
179 The ->decl field usually points to a DECL node, but there are two
180 exceptions. In the namespace of type tags, the bound entity is a
181 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
182 identifier is encountered, it is bound to error_mark_node to
183 suppress further errors about that identifier in the current
186 The ->type field stores the type of the declaration in this scope;
187 if NULL, the type is the type of the ->decl field. This is only of
188 relevance for objects with external or internal linkage which may
189 be redeclared in inner scopes, forming composite types that only
190 persist for the duration of those scopes. In the external scope,
191 this stores the composite of all the types declared for this
192 object, visible or not. The ->inner_comp field (used only at file
193 scope) stores whether an incomplete array type at file scope was
194 completed at an inner scope to an array size other than 1.
196 The depth field is copied from the scope structure that holds this
197 decl. It is used to preserve the proper ordering of the ->shadowed
198 field (see bind()) and also for a handful of special-case checks.
199 Finally, the invisible bit is true for a decl which should be
200 ignored for purposes of normal name lookup, and the nested bit is
201 true for a decl that's been bound a second time in an inner scope;
202 in all such cases, the binding in the outer scope will have its
203 invisible bit true. */
205 struct c_binding GTY((chain_next ("%h.prev")))
207 tree decl; /* the decl bound */
208 tree type; /* the type in this scope */
209 tree id; /* the identifier it's bound to */
210 struct c_binding *prev; /* the previous decl in this scope */
211 struct c_binding *shadowed; /* the innermost decl shadowed by this one */
212 unsigned int depth : 28; /* depth of this scope */
213 BOOL_BITFIELD invisible : 1; /* normal lookup should ignore this binding */
214 BOOL_BITFIELD nested : 1; /* do not set DECL_CONTEXT when popping */
215 BOOL_BITFIELD inner_comp : 1; /* incomplete array completed in inner scope */
218 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
219 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
220 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
221 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
223 #define I_SYMBOL_BINDING(node) \
224 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding)
225 #define I_SYMBOL_DECL(node) \
226 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
228 #define I_TAG_BINDING(node) \
229 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding)
230 #define I_TAG_DECL(node) \
231 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
233 #define I_LABEL_BINDING(node) \
234 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding)
235 #define I_LABEL_DECL(node) \
236 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
238 /* Each C symbol points to three linked lists of c_binding structures.
239 These describe the values of the identifier in the three different
240 namespaces defined by the language. */
242 struct lang_identifier GTY(())
244 struct c_common_identifier common_id;
245 struct c_binding *symbol_binding; /* vars, funcs, constants, typedefs */
246 struct c_binding *tag_binding; /* struct/union/enum tags */
247 struct c_binding *label_binding; /* labels */
250 /* Validate c-lang.c's assumptions. */
251 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
252 [(sizeof(struct lang_identifier) == C_SIZEOF_STRUCT_LANG_IDENTIFIER) ? 1 : -1];
254 /* The resulting tree type. */
257 GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
258 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)")))
260 union tree_node GTY ((tag ("0"),
261 desc ("tree_node_structure (&%h)")))
263 struct lang_identifier GTY ((tag ("1"))) identifier;
266 /* Each c_scope structure describes the complete contents of one
267 scope. Four scopes are distinguished specially: the innermost or
268 current scope, the innermost function scope, the file scope (always
269 the second to outermost) and the outermost or external scope.
271 Most declarations are recorded in the current scope.
273 All normal label declarations are recorded in the innermost
274 function scope, as are bindings of undeclared identifiers to
275 error_mark_node. (GCC permits nested functions as an extension,
276 hence the 'innermost' qualifier.) Explicitly declared labels
277 (using the __label__ extension) appear in the current scope.
279 Being in the file scope (current_scope == file_scope) causes
280 special behavior in several places below. Also, under some
281 conditions the Objective-C front end records declarations in the
282 file scope even though that isn't the current scope.
284 All declarations with external linkage are recorded in the external
285 scope, even if they aren't visible there; this models the fact that
286 such declarations are visible to the entire program, and (with a
287 bit of cleverness, see pushdecl) allows diagnosis of some violations
288 of C99 6.2.2p7 and 6.2.7p2:
290 If, within the same translation unit, the same identifier appears
291 with both internal and external linkage, the behavior is
294 All declarations that refer to the same object or function shall
295 have compatible type; otherwise, the behavior is undefined.
297 Initially only the built-in declarations, which describe compiler
298 intrinsic functions plus a subset of the standard library, are in
301 The order of the blocks list matters, and it is frequently appended
302 to. To avoid having to walk all the way to the end of the list on
303 each insertion, or reverse the list later, we maintain a pointer to
304 the last list entry. (FIXME: It should be feasible to use a reversed
307 The bindings list is strictly in reverse order of declarations;
308 pop_scope relies on this. */
311 struct c_scope GTY((chain_next ("%h.outer")))
313 /* The scope containing this one. */
314 struct c_scope *outer;
316 /* The next outermost function scope. */
317 struct c_scope *outer_function;
319 /* All bindings in this scope. */
320 struct c_binding *bindings;
322 /* For each scope (except the global one), a chain of BLOCK nodes
323 for all the scopes that were entered and exited one level down. */
327 /* The depth of this scope. Used to keep the ->shadowed chain of
328 bindings sorted innermost to outermost. */
329 unsigned int depth : 28;
331 /* True if we are currently filling this scope with parameter
333 BOOL_BITFIELD parm_flag : 1;
335 /* True if we saw [*] in this scope. Used to give an error messages
336 if these appears in a function definition. */
337 BOOL_BITFIELD had_vla_unspec : 1;
339 /* True if we already complained about forward parameter decls
340 in this scope. This prevents double warnings on
341 foo (int a; int b; ...) */
342 BOOL_BITFIELD warned_forward_parm_decls : 1;
344 /* True if this is the outermost block scope of a function body.
345 This scope contains the parameters, the local variables declared
346 in the outermost block, and all the labels (except those in
347 nested functions, or declared at block scope with __label__). */
348 BOOL_BITFIELD function_body : 1;
350 /* True means make a BLOCK for this scope no matter what. */
351 BOOL_BITFIELD keep : 1;
354 /* The scope currently in effect. */
356 static GTY(()) struct c_scope *current_scope;
358 /* The innermost function scope. Ordinary (not explicitly declared)
359 labels, bindings to error_mark_node, and the lazily-created
360 bindings of __func__ and its friends get this scope. */
362 static GTY(()) struct c_scope *current_function_scope;
364 /* The C file scope. This is reset for each input translation unit. */
366 static GTY(()) struct c_scope *file_scope;
368 /* The outermost scope. This is used for all declarations with
369 external linkage, and only these, hence the name. */
371 static GTY(()) struct c_scope *external_scope;
373 /* A chain of c_scope structures awaiting reuse. */
375 static GTY((deletable)) struct c_scope *scope_freelist;
377 /* A chain of c_binding structures awaiting reuse. */
379 static GTY((deletable)) struct c_binding *binding_freelist;
381 /* Append VAR to LIST in scope SCOPE. */
382 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
383 struct c_scope *s_ = (scope); \
385 if (s_->list##_last) \
386 TREE_CHAIN (s_->list##_last) = d_; \
389 s_->list##_last = d_; \
392 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
393 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
394 struct c_scope *t_ = (tscope); \
395 struct c_scope *f_ = (fscope); \
397 TREE_CHAIN (t_->to##_last) = f_->from; \
400 t_->to##_last = f_->from##_last; \
403 /* True means unconditionally make a BLOCK for the next scope pushed. */
405 static bool keep_next_level_flag;
407 /* True means the next call to push_scope will be the outermost scope
408 of a function body, so do not push a new scope, merely cease
409 expecting parameter decls. */
411 static bool next_is_function_body;
413 /* Functions called automatically at the beginning and end of execution. */
415 static GTY(()) tree static_ctors;
416 static GTY(()) tree static_dtors;
418 /* Forward declarations. */
419 static tree lookup_name_in_scope (tree, struct c_scope *);
420 static tree c_make_fname_decl (tree, int);
421 static tree grokdeclarator (const struct c_declarator *,
422 struct c_declspecs *,
423 enum decl_context, bool, tree *);
424 static tree grokparms (struct c_arg_info *, bool);
425 static void layout_array_type (tree);
427 /* T is a statement. Add it to the statement-tree. This is the
428 C/ObjC version--C++ has a slightly different version of this
434 enum tree_code code = TREE_CODE (t);
436 if (EXPR_P (t) && code != LABEL_EXPR)
438 if (!EXPR_HAS_LOCATION (t))
439 SET_EXPR_LOCATION (t, input_location);
442 if (code == LABEL_EXPR || code == CASE_LABEL_EXPR)
443 STATEMENT_LIST_HAS_LABEL (cur_stmt_list) = 1;
445 /* Add T to the statement-tree. Non-side-effect statements need to be
446 recorded during statement expressions. */
447 append_to_statement_list_force (t, &cur_stmt_list);
452 /* States indicating how grokdeclarator() should handle declspecs marked
453 with __attribute__((deprecated)). An object declared as
454 __attribute__((deprecated)) suppresses warnings of uses of other
457 enum deprecated_states {
462 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
465 c_print_identifier (FILE *file, tree node, int indent)
467 print_node (file, "symbol", I_SYMBOL_DECL (node), indent + 4);
468 print_node (file, "tag", I_TAG_DECL (node), indent + 4);
469 print_node (file, "label", I_LABEL_DECL (node), indent + 4);
470 if (C_IS_RESERVED_WORD (node))
472 tree rid = ridpointers[C_RID_CODE (node)];
473 indent_to (file, indent + 4);
474 fprintf (file, "rid %p \"%s\"",
475 (void *) rid, IDENTIFIER_POINTER (rid));
479 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
480 which may be any of several kinds of DECL or TYPE or error_mark_node,
481 in the scope SCOPE. */
483 bind (tree name, tree decl, struct c_scope *scope, bool invisible, bool nested)
485 struct c_binding *b, **here;
487 if (binding_freelist)
489 b = binding_freelist;
490 binding_freelist = b->prev;
493 b = GGC_NEW (struct c_binding);
498 b->depth = scope->depth;
499 b->invisible = invisible;
505 b->prev = scope->bindings;
511 switch (TREE_CODE (decl))
513 case LABEL_DECL: here = &I_LABEL_BINDING (name); break;
516 case RECORD_TYPE: here = &I_TAG_BINDING (name); break;
522 case ERROR_MARK: here = &I_SYMBOL_BINDING (name); break;
528 /* Locate the appropriate place in the chain of shadowed decls
529 to insert this binding. Normally, scope == current_scope and
530 this does nothing. */
531 while (*here && (*here)->depth > scope->depth)
532 here = &(*here)->shadowed;
538 /* Clear the binding structure B, stick it on the binding_freelist,
539 and return the former value of b->prev. This is used by pop_scope
540 and get_parm_info to iterate destructively over all the bindings
541 from a given scope. */
542 static struct c_binding *
543 free_binding_and_advance (struct c_binding *b)
545 struct c_binding *prev = b->prev;
547 memset (b, 0, sizeof (struct c_binding));
548 b->prev = binding_freelist;
549 binding_freelist = b;
555 /* Hook called at end of compilation to assume 1 elt
556 for a file-scope tentative array defn that wasn't complete before. */
559 c_finish_incomplete_decl (tree decl)
561 if (TREE_CODE (decl) == VAR_DECL)
563 tree type = TREE_TYPE (decl);
564 if (type != error_mark_node
565 && TREE_CODE (type) == ARRAY_TYPE
566 && !DECL_EXTERNAL (decl)
567 && TYPE_DOMAIN (type) == 0)
569 warning (0, "array %q+D assumed to have one element", decl);
571 complete_array_type (&TREE_TYPE (decl), NULL_TREE, true);
573 layout_decl (decl, 0);
578 /* The Objective-C front-end often needs to determine the current scope. */
581 objc_get_current_scope (void)
583 return current_scope;
586 /* The following function is used only by Objective-C. It needs to live here
587 because it accesses the innards of c_scope. */
590 objc_mark_locals_volatile (void *enclosing_blk)
592 struct c_scope *scope;
595 for (scope = current_scope;
596 scope && scope != enclosing_blk;
597 scope = scope->outer)
599 for (b = scope->bindings; b; b = b->prev)
600 objc_volatilize_decl (b->decl);
602 /* Do not climb up past the current function. */
603 if (scope->function_body)
608 /* Nonzero if we are currently in file scope. */
611 global_bindings_p (void)
613 return current_scope == file_scope && !c_override_global_bindings_to_false;
617 keep_next_level (void)
619 keep_next_level_flag = true;
622 /* Identify this scope as currently being filled with parameters. */
625 declare_parm_level (void)
627 current_scope->parm_flag = true;
633 if (next_is_function_body)
635 /* This is the transition from the parameters to the top level
636 of the function body. These are the same scope
637 (C99 6.2.1p4,6) so we do not push another scope structure.
638 next_is_function_body is set only by store_parm_decls, which
639 in turn is called when and only when we are about to
640 encounter the opening curly brace for the function body.
642 The outermost block of a function always gets a BLOCK node,
643 because the debugging output routines expect that each
644 function has at least one BLOCK. */
645 current_scope->parm_flag = false;
646 current_scope->function_body = true;
647 current_scope->keep = true;
648 current_scope->outer_function = current_function_scope;
649 current_function_scope = current_scope;
651 keep_next_level_flag = false;
652 next_is_function_body = false;
656 struct c_scope *scope;
659 scope = scope_freelist;
660 scope_freelist = scope->outer;
663 scope = GGC_CNEW (struct c_scope);
665 scope->keep = keep_next_level_flag;
666 scope->outer = current_scope;
667 scope->depth = current_scope ? (current_scope->depth + 1) : 0;
669 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
671 if (current_scope && scope->depth == 0)
674 sorry ("GCC supports only %u nested scopes", scope->depth);
677 current_scope = scope;
678 keep_next_level_flag = false;
682 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
685 set_type_context (tree type, tree context)
687 for (type = TYPE_MAIN_VARIANT (type); type;
688 type = TYPE_NEXT_VARIANT (type))
689 TYPE_CONTEXT (type) = context;
692 /* Exit a scope. Restore the state of the identifier-decl mappings
693 that were in effect when this scope was entered. Return a BLOCK
694 node containing all the DECLs in this scope that are of interest
695 to debug info generation. */
700 struct c_scope *scope = current_scope;
701 tree block, context, p;
704 bool functionbody = scope->function_body;
705 bool keep = functionbody || scope->keep || scope->bindings;
707 c_end_vm_scope (scope->depth);
709 /* If appropriate, create a BLOCK to record the decls for the life
714 block = make_node (BLOCK);
715 BLOCK_SUBBLOCKS (block) = scope->blocks;
716 TREE_USED (block) = 1;
718 /* In each subblock, record that this is its superior. */
719 for (p = scope->blocks; p; p = TREE_CHAIN (p))
720 BLOCK_SUPERCONTEXT (p) = block;
722 BLOCK_VARS (block) = 0;
725 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
726 scope must be set so that they point to the appropriate
727 construct, i.e. either to the current FUNCTION_DECL node, or
728 else to the BLOCK node we just constructed.
730 Note that for tagged types whose scope is just the formal
731 parameter list for some function type specification, we can't
732 properly set their TYPE_CONTEXTs here, because we don't have a
733 pointer to the appropriate FUNCTION_TYPE node readily available
734 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
735 type nodes get set in `grokdeclarator' as soon as we have created
736 the FUNCTION_TYPE node which will represent the "scope" for these
737 "parameter list local" tagged types. */
738 if (scope->function_body)
739 context = current_function_decl;
740 else if (scope == file_scope)
742 tree file_decl = build_decl (TRANSLATION_UNIT_DECL, 0, 0);
743 TREE_CHAIN (file_decl) = all_translation_units;
744 all_translation_units = file_decl;
750 /* Clear all bindings in this scope. */
751 for (b = scope->bindings; b; b = free_binding_and_advance (b))
754 switch (TREE_CODE (p))
757 /* Warnings for unused labels, errors for undefined labels. */
758 if (TREE_USED (p) && !DECL_INITIAL (p))
760 error ("label %q+D used but not defined", p);
761 DECL_INITIAL (p) = error_mark_node;
763 else if (!TREE_USED (p) && warn_unused_label)
765 if (DECL_INITIAL (p))
766 warning (0, "label %q+D defined but not used", p);
768 warning (0, "label %q+D declared but not defined", p);
770 /* Labels go in BLOCK_VARS. */
771 TREE_CHAIN (p) = BLOCK_VARS (block);
772 BLOCK_VARS (block) = p;
773 gcc_assert (I_LABEL_BINDING (b->id) == b);
774 I_LABEL_BINDING (b->id) = b->shadowed;
780 set_type_context (p, context);
782 /* Types may not have tag-names, in which case the type
783 appears in the bindings list with b->id NULL. */
786 gcc_assert (I_TAG_BINDING (b->id) == b);
787 I_TAG_BINDING (b->id) = b->shadowed;
792 /* Propagate TREE_ADDRESSABLE from nested functions to their
793 containing functions. */
794 if (!TREE_ASM_WRITTEN (p)
795 && DECL_INITIAL (p) != 0
796 && TREE_ADDRESSABLE (p)
797 && DECL_ABSTRACT_ORIGIN (p) != 0
798 && DECL_ABSTRACT_ORIGIN (p) != p)
799 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
800 if (!DECL_EXTERNAL (p)
801 && DECL_INITIAL (p) == 0
802 && scope != file_scope
803 && scope != external_scope)
805 error ("nested function %q+D declared but never defined", p);
806 undef_nested_function = true;
808 /* C99 6.7.4p6: "a function with external linkage... declared
809 with an inline function specifier ... shall also be defined in the
810 same translation unit." */
811 else if (DECL_DECLARED_INLINE_P (p)
814 && !flag_gnu89_inline)
815 pedwarn ("inline function %q+D declared but never defined", p);
820 /* Warnings for unused variables. */
822 && !TREE_NO_WARNING (p)
823 && !DECL_IN_SYSTEM_HEADER (p)
825 && !DECL_ARTIFICIAL (p)
826 && scope != file_scope
827 && scope != external_scope)
828 warning (OPT_Wunused_variable, "unused variable %q+D", p);
832 error ("type of array %q+D completed incompatibly with"
833 " implicit initialization", p);
840 /* All of these go in BLOCK_VARS, but only if this is the
841 binding in the home scope. */
844 TREE_CHAIN (p) = BLOCK_VARS (block);
845 BLOCK_VARS (block) = p;
847 /* If this is the file scope, and we are processing more
848 than one translation unit in this compilation, set
849 DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL.
850 This makes same_translation_unit_p work, and causes
851 static declarations to be given disambiguating suffixes. */
852 if (scope == file_scope && num_in_fnames > 1)
854 DECL_CONTEXT (p) = context;
855 if (TREE_CODE (p) == TYPE_DECL)
856 set_type_context (TREE_TYPE (p), context);
860 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
861 already been put there by store_parm_decls. Unused-
862 parameter warnings are handled by function.c.
863 error_mark_node obviously does not go in BLOCK_VARS and
864 does not get unused-variable warnings. */
867 /* It is possible for a decl not to have a name. We get
868 here with b->id NULL in this case. */
871 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
872 I_SYMBOL_BINDING (b->id) = b->shadowed;
873 if (b->shadowed && b->shadowed->type)
874 TREE_TYPE (b->shadowed->decl) = b->shadowed->type;
884 /* Dispose of the block that we just made inside some higher level. */
885 if ((scope->function_body || scope == file_scope) && context)
887 DECL_INITIAL (context) = block;
888 BLOCK_SUPERCONTEXT (block) = context;
890 else if (scope->outer)
893 SCOPE_LIST_APPEND (scope->outer, blocks, block);
894 /* If we did not make a block for the scope just exited, any
895 blocks made for inner scopes must be carried forward so they
896 will later become subblocks of something else. */
897 else if (scope->blocks)
898 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
901 /* Pop the current scope, and free the structure for reuse. */
902 current_scope = scope->outer;
903 if (scope->function_body)
904 current_function_scope = scope->outer_function;
906 memset (scope, 0, sizeof (struct c_scope));
907 scope->outer = scope_freelist;
908 scope_freelist = scope;
914 push_file_scope (void)
922 file_scope = current_scope;
924 start_fname_decls ();
926 for (decl = visible_builtins; decl; decl = TREE_CHAIN (decl))
927 bind (DECL_NAME (decl), decl, file_scope,
928 /*invisible=*/false, /*nested=*/true);
932 pop_file_scope (void)
934 /* In case there were missing closebraces, get us back to the global
936 while (current_scope != file_scope)
939 /* __FUNCTION__ is defined at file scope (""). This
940 call may not be necessary as my tests indicate it
941 still works without it. */
942 finish_fname_decls ();
944 /* This is the point to write out a PCH if we're doing that.
945 In that case we do not want to do anything else. */
948 c_common_write_pch ();
952 /* Pop off the file scope and close this translation unit. */
956 maybe_apply_pending_pragma_weaks ();
957 cgraph_finalize_compilation_unit ();
960 /* Insert BLOCK at the end of the list of subblocks of the current
961 scope. This is used when a BIND_EXPR is expanded, to handle the
962 BLOCK node inside the BIND_EXPR. */
965 insert_block (tree block)
967 TREE_USED (block) = 1;
968 SCOPE_LIST_APPEND (current_scope, blocks, block);
971 /* Push a definition or a declaration of struct, union or enum tag "name".
972 "type" should be the type node.
973 We assume that the tag "name" is not already defined.
975 Note that the definition may really be just a forward reference.
976 In that case, the TYPE_SIZE will be zero. */
979 pushtag (tree name, tree type)
981 /* Record the identifier as the type's name if it has none. */
982 if (name && !TYPE_NAME (type))
983 TYPE_NAME (type) = name;
984 bind (name, type, current_scope, /*invisible=*/false, /*nested=*/false);
986 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
987 tagged type we just added to the current scope. This fake
988 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
989 to output a representation of a tagged type, and it also gives
990 us a convenient place to record the "scope start" address for the
993 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
995 /* An approximation for now, so we can tell this is a function-scope tag.
996 This will be updated in pop_scope. */
997 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1000 /* Subroutine of compare_decls. Allow harmless mismatches in return
1001 and argument types provided that the type modes match. This function
1002 return a unified type given a suitable match, and 0 otherwise. */
1005 match_builtin_function_types (tree newtype, tree oldtype)
1007 tree newrettype, oldrettype;
1008 tree newargs, oldargs;
1009 tree trytype, tryargs;
1011 /* Accept the return type of the new declaration if same modes. */
1012 oldrettype = TREE_TYPE (oldtype);
1013 newrettype = TREE_TYPE (newtype);
1015 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
1018 oldargs = TYPE_ARG_TYPES (oldtype);
1019 newargs = TYPE_ARG_TYPES (newtype);
1022 while (oldargs || newargs)
1026 || !TREE_VALUE (oldargs)
1027 || !TREE_VALUE (newargs)
1028 || TYPE_MODE (TREE_VALUE (oldargs))
1029 != TYPE_MODE (TREE_VALUE (newargs)))
1032 oldargs = TREE_CHAIN (oldargs);
1033 newargs = TREE_CHAIN (newargs);
1036 trytype = build_function_type (newrettype, tryargs);
1037 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
1040 /* Subroutine of diagnose_mismatched_decls. Check for function type
1041 mismatch involving an empty arglist vs a nonempty one and give clearer
1044 diagnose_arglist_conflict (tree newdecl, tree olddecl,
1045 tree newtype, tree oldtype)
1049 if (TREE_CODE (olddecl) != FUNCTION_DECL
1050 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype))
1051 || !((TYPE_ARG_TYPES (oldtype) == 0 && DECL_INITIAL (olddecl) == 0)
1053 (TYPE_ARG_TYPES (newtype) == 0 && DECL_INITIAL (newdecl) == 0)))
1056 t = TYPE_ARG_TYPES (oldtype);
1058 t = TYPE_ARG_TYPES (newtype);
1059 for (; t; t = TREE_CHAIN (t))
1061 tree type = TREE_VALUE (t);
1063 if (TREE_CHAIN (t) == 0
1064 && TYPE_MAIN_VARIANT (type) != void_type_node)
1066 inform ("a parameter list with an ellipsis can%'t match "
1067 "an empty parameter name list declaration");
1071 if (c_type_promotes_to (type) != type)
1073 inform ("an argument type that has a default promotion can%'t match "
1074 "an empty parameter name list declaration");
1080 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1081 old-style function definition, NEWDECL is a prototype declaration.
1082 Diagnose inconsistencies in the argument list. Returns TRUE if
1083 the prototype is compatible, FALSE if not. */
1085 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
1087 tree newargs, oldargs;
1090 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1092 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
1093 newargs = TYPE_ARG_TYPES (newtype);
1098 tree oldargtype = TREE_VALUE (oldargs);
1099 tree newargtype = TREE_VALUE (newargs);
1101 if (oldargtype == error_mark_node || newargtype == error_mark_node)
1104 oldargtype = TYPE_MAIN_VARIANT (oldargtype);
1105 newargtype = TYPE_MAIN_VARIANT (newargtype);
1107 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
1110 /* Reaching the end of just one list means the two decls don't
1111 agree on the number of arguments. */
1112 if (END_OF_ARGLIST (oldargtype))
1114 error ("prototype for %q+D declares more arguments "
1115 "than previous old-style definition", newdecl);
1118 else if (END_OF_ARGLIST (newargtype))
1120 error ("prototype for %q+D declares fewer arguments "
1121 "than previous old-style definition", newdecl);
1125 /* Type for passing arg must be consistent with that declared
1127 else if (!comptypes (oldargtype, newargtype))
1129 error ("prototype for %q+D declares argument %d"
1130 " with incompatible type",
1135 oldargs = TREE_CHAIN (oldargs);
1136 newargs = TREE_CHAIN (newargs);
1140 /* If we get here, no errors were found, but do issue a warning
1141 for this poor-style construct. */
1142 warning (0, "prototype for %q+D follows non-prototype definition",
1145 #undef END_OF_ARGLIST
1148 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1149 first in a pair of mismatched declarations, using the diagnostic
1152 locate_old_decl (tree decl, void (*diag)(const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2))
1154 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
1156 else if (DECL_INITIAL (decl))
1157 diag (G_("previous definition of %q+D was here"), decl);
1158 else if (C_DECL_IMPLICIT (decl))
1159 diag (G_("previous implicit declaration of %q+D was here"), decl);
1161 diag (G_("previous declaration of %q+D was here"), decl);
1164 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1165 Returns true if the caller should proceed to merge the two, false
1166 if OLDDECL should simply be discarded. As a side effect, issues
1167 all necessary diagnostics for invalid or poor-style combinations.
1168 If it returns true, writes the types of NEWDECL and OLDDECL to
1169 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1170 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1173 diagnose_mismatched_decls (tree newdecl, tree olddecl,
1174 tree *newtypep, tree *oldtypep)
1176 tree newtype, oldtype;
1177 bool pedwarned = false;
1178 bool warned = false;
1181 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1182 && DECL_EXTERNAL (DECL))
1184 /* If we have error_mark_node for either decl or type, just discard
1185 the previous decl - we're in an error cascade already. */
1186 if (olddecl == error_mark_node || newdecl == error_mark_node)
1188 *oldtypep = oldtype = TREE_TYPE (olddecl);
1189 *newtypep = newtype = TREE_TYPE (newdecl);
1190 if (oldtype == error_mark_node || newtype == error_mark_node)
1193 /* Two different categories of symbol altogether. This is an error
1194 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1195 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1197 if (!(TREE_CODE (olddecl) == FUNCTION_DECL
1198 && DECL_BUILT_IN (olddecl)
1199 && !C_DECL_DECLARED_BUILTIN (olddecl)))
1201 error ("%q+D redeclared as different kind of symbol", newdecl);
1202 locate_old_decl (olddecl, error);
1204 else if (TREE_PUBLIC (newdecl))
1205 warning (0, "built-in function %q+D declared as non-function",
1208 warning (OPT_Wshadow, "declaration of %q+D shadows "
1209 "a built-in function", newdecl);
1213 /* Enumerators have no linkage, so may only be declared once in a
1215 if (TREE_CODE (olddecl) == CONST_DECL)
1217 error ("redeclaration of enumerator %q+D", newdecl);
1218 locate_old_decl (olddecl, error);
1222 if (!comptypes (oldtype, newtype))
1224 if (TREE_CODE (olddecl) == FUNCTION_DECL
1225 && DECL_BUILT_IN (olddecl) && !C_DECL_DECLARED_BUILTIN (olddecl))
1227 /* Accept harmless mismatch in function types.
1228 This is for the ffs and fprintf builtins. */
1229 tree trytype = match_builtin_function_types (newtype, oldtype);
1231 if (trytype && comptypes (newtype, trytype))
1232 *oldtypep = oldtype = trytype;
1235 /* If types don't match for a built-in, throw away the
1236 built-in. No point in calling locate_old_decl here, it
1237 won't print anything. */
1238 warning (0, "conflicting types for built-in function %q+D",
1243 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1244 && DECL_IS_BUILTIN (olddecl))
1246 /* A conflicting function declaration for a predeclared
1247 function that isn't actually built in. Objective C uses
1248 these. The new declaration silently overrides everything
1249 but the volatility (i.e. noreturn) indication. See also
1250 below. FIXME: Make Objective C use normal builtins. */
1251 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1254 /* Permit void foo (...) to match int foo (...) if the latter is
1255 the definition and implicit int was used. See
1256 c-torture/compile/920625-2.c. */
1257 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
1258 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
1259 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
1260 && C_FUNCTION_IMPLICIT_INT (newdecl) && !DECL_INITIAL (olddecl))
1262 pedwarn ("conflicting types for %q+D", newdecl);
1263 /* Make sure we keep void as the return type. */
1264 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
1265 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1268 /* Permit void foo (...) to match an earlier call to foo (...) with
1269 no declared type (thus, implicitly int). */
1270 else if (TREE_CODE (newdecl) == FUNCTION_DECL
1271 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == void_type_node
1272 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == integer_type_node
1273 && C_DECL_IMPLICIT (olddecl) && !DECL_INITIAL (olddecl))
1275 pedwarn ("conflicting types for %q+D", newdecl);
1276 /* Make sure we keep void as the return type. */
1277 TREE_TYPE (olddecl) = *oldtypep = oldtype = newtype;
1282 if (TYPE_QUALS (newtype) != TYPE_QUALS (oldtype))
1283 error ("conflicting type qualifiers for %q+D", newdecl);
1285 error ("conflicting types for %q+D", newdecl);
1286 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
1287 locate_old_decl (olddecl, error);
1292 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1293 but silently ignore the redeclaration if either is in a system
1294 header. (Conflicting redeclarations were handled above.) */
1295 if (TREE_CODE (newdecl) == TYPE_DECL)
1297 if (DECL_IN_SYSTEM_HEADER (newdecl) || DECL_IN_SYSTEM_HEADER (olddecl))
1298 return true; /* Allow OLDDECL to continue in use. */
1300 error ("redefinition of typedef %q+D", newdecl);
1301 locate_old_decl (olddecl, error);
1305 /* Function declarations can either be 'static' or 'extern' (no
1306 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1307 can never conflict with each other on account of linkage
1308 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
1309 gnu89 mode permits two definitions if one is 'extern inline' and
1310 one is not. The non- extern-inline definition supersedes the
1311 extern-inline definition. */
1313 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1315 /* If you declare a built-in function name as static, or
1316 define the built-in with an old-style definition (so we
1317 can't validate the argument list) the built-in definition is
1318 overridden, but optionally warn this was a bad choice of name. */
1319 if (DECL_BUILT_IN (olddecl)
1320 && !C_DECL_DECLARED_BUILTIN (olddecl)
1321 && (!TREE_PUBLIC (newdecl)
1322 || (DECL_INITIAL (newdecl)
1323 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl)))))
1325 warning (OPT_Wshadow, "declaration of %q+D shadows "
1326 "a built-in function", newdecl);
1327 /* Discard the old built-in function. */
1331 if (DECL_INITIAL (newdecl))
1333 if (DECL_INITIAL (olddecl))
1335 /* If both decls are in the same TU and the new declaration
1336 isn't overriding an extern inline reject the new decl.
1337 In c99, no overriding is allowed in the same translation
1339 if ((!DECL_EXTERN_INLINE (olddecl)
1340 || DECL_EXTERN_INLINE (newdecl)
1341 || (!flag_gnu89_inline
1342 && (!DECL_DECLARED_INLINE_P (olddecl)
1343 || !lookup_attribute ("gnu_inline",
1344 DECL_ATTRIBUTES (olddecl)))
1345 && (!DECL_DECLARED_INLINE_P (newdecl)
1346 || !lookup_attribute ("gnu_inline",
1347 DECL_ATTRIBUTES (newdecl))))
1349 && same_translation_unit_p (newdecl, olddecl))
1351 error ("redefinition of %q+D", newdecl);
1352 locate_old_decl (olddecl, error);
1357 /* If we have a prototype after an old-style function definition,
1358 the argument types must be checked specially. */
1359 else if (DECL_INITIAL (olddecl)
1360 && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype)
1361 && TYPE_ACTUAL_ARG_TYPES (oldtype)
1362 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
1364 locate_old_decl (olddecl, error);
1367 /* A non-static declaration (even an "extern") followed by a
1368 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1369 The same is true for a static forward declaration at block
1370 scope followed by a non-static declaration/definition at file
1371 scope. Static followed by non-static at the same scope is
1372 not undefined behavior, and is the most convenient way to get
1373 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1374 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1375 we do diagnose it if -Wtraditional. */
1376 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
1378 /* Two exceptions to the rule. If olddecl is an extern
1379 inline, or a predeclared function that isn't actually
1380 built in, newdecl silently overrides olddecl. The latter
1381 occur only in Objective C; see also above. (FIXME: Make
1382 Objective C use normal builtins.) */
1383 if (!DECL_IS_BUILTIN (olddecl)
1384 && !DECL_EXTERN_INLINE (olddecl))
1386 error ("static declaration of %q+D follows "
1387 "non-static declaration", newdecl);
1388 locate_old_decl (olddecl, error);
1392 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl))
1394 if (DECL_CONTEXT (olddecl))
1396 error ("non-static declaration of %q+D follows "
1397 "static declaration", newdecl);
1398 locate_old_decl (olddecl, error);
1401 else if (warn_traditional)
1403 warning (OPT_Wtraditional, "non-static declaration of %q+D "
1404 "follows static declaration", newdecl);
1409 /* Make sure gnu_inline attribute is either not present, or
1410 present on all inline decls. */
1411 if (DECL_DECLARED_INLINE_P (olddecl)
1412 && DECL_DECLARED_INLINE_P (newdecl))
1414 bool newa = lookup_attribute ("gnu_inline",
1415 DECL_ATTRIBUTES (newdecl)) != NULL;
1416 bool olda = lookup_attribute ("gnu_inline",
1417 DECL_ATTRIBUTES (olddecl)) != NULL;
1420 error ("%<gnu_inline%> attribute present on %q+D",
1421 newa ? newdecl : olddecl);
1422 error ("%Jbut not here", newa ? olddecl : newdecl);
1426 else if (TREE_CODE (newdecl) == VAR_DECL)
1428 /* Only variables can be thread-local, and all declarations must
1429 agree on this property. */
1430 if (C_DECL_THREADPRIVATE_P (olddecl) && !DECL_THREAD_LOCAL_P (newdecl))
1432 /* Nothing to check. Since OLDDECL is marked threadprivate
1433 and NEWDECL does not have a thread-local attribute, we
1434 will merge the threadprivate attribute into NEWDECL. */
1437 else if (DECL_THREAD_LOCAL_P (newdecl) != DECL_THREAD_LOCAL_P (olddecl))
1439 if (DECL_THREAD_LOCAL_P (newdecl))
1440 error ("thread-local declaration of %q+D follows "
1441 "non-thread-local declaration", newdecl);
1443 error ("non-thread-local declaration of %q+D follows "
1444 "thread-local declaration", newdecl);
1446 locate_old_decl (olddecl, error);
1450 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1451 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
1453 error ("redefinition of %q+D", newdecl);
1454 locate_old_decl (olddecl, error);
1458 /* Objects declared at file scope: if the first declaration had
1459 external linkage (even if it was an external reference) the
1460 second must have external linkage as well, or the behavior is
1461 undefined. If the first declaration had internal linkage, then
1462 the second must too, or else be an external reference (in which
1463 case the composite declaration still has internal linkage).
1464 As for function declarations, we warn about the static-then-
1465 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1466 if (DECL_FILE_SCOPE_P (newdecl)
1467 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
1469 if (DECL_EXTERNAL (newdecl))
1471 if (!DECL_FILE_SCOPE_P (olddecl))
1473 error ("extern declaration of %q+D follows "
1474 "declaration with no linkage", newdecl);
1475 locate_old_decl (olddecl, error);
1478 else if (warn_traditional)
1480 warning (OPT_Wtraditional, "non-static declaration of %q+D "
1481 "follows static declaration", newdecl);
1487 if (TREE_PUBLIC (newdecl))
1488 error ("non-static declaration of %q+D follows "
1489 "static declaration", newdecl);
1491 error ("static declaration of %q+D follows "
1492 "non-static declaration", newdecl);
1494 locate_old_decl (olddecl, error);
1498 /* Two objects with the same name declared at the same block
1499 scope must both be external references (6.7p3). */
1500 else if (!DECL_FILE_SCOPE_P (newdecl))
1502 if (DECL_EXTERNAL (newdecl))
1504 /* Extern with initializer at block scope, which will
1505 already have received an error. */
1507 else if (DECL_EXTERNAL (olddecl))
1509 error ("declaration of %q+D with no linkage follows "
1510 "extern declaration", newdecl);
1511 locate_old_decl (olddecl, error);
1515 error ("redeclaration of %q+D with no linkage", newdecl);
1516 locate_old_decl (olddecl, error);
1524 /* All decls must agree on a visibility. */
1525 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl), TS_DECL_WITH_VIS)
1526 && DECL_VISIBILITY_SPECIFIED (newdecl) && DECL_VISIBILITY_SPECIFIED (olddecl)
1527 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1529 warning (0, "redeclaration of %q+D with different visibility "
1530 "(old visibility preserved)", newdecl);
1534 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1536 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
1537 if (DECL_DECLARED_INLINE_P (newdecl)
1538 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1540 warning (OPT_Wattributes, "inline declaration of %qD follows "
1541 "declaration with attribute noinline", newdecl);
1544 else if (DECL_DECLARED_INLINE_P (olddecl)
1545 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1547 warning (OPT_Wattributes, "declaration of %q+D with attribute "
1548 "noinline follows inline declaration ", newdecl);
1552 /* Inline declaration after use or definition.
1553 ??? Should we still warn about this now we have unit-at-a-time
1554 mode and can get it right?
1555 Definitely don't complain if the decls are in different translation
1557 C99 permits this, so don't warn in that case. (The function
1558 may not be inlined everywhere in function-at-a-time mode, but
1559 we still shouldn't warn.) */
1560 if (DECL_DECLARED_INLINE_P (newdecl) && !DECL_DECLARED_INLINE_P (olddecl)
1561 && same_translation_unit_p (olddecl, newdecl)
1562 && flag_gnu89_inline)
1564 if (TREE_USED (olddecl))
1566 warning (0, "%q+D declared inline after being called", olddecl);
1569 else if (DECL_INITIAL (olddecl))
1571 warning (0, "%q+D declared inline after its definition", olddecl);
1576 else /* PARM_DECL, VAR_DECL */
1578 /* Redeclaration of a parameter is a constraint violation (this is
1579 not explicitly stated, but follows from C99 6.7p3 [no more than
1580 one declaration of the same identifier with no linkage in the
1581 same scope, except type tags] and 6.2.2p6 [parameters have no
1582 linkage]). We must check for a forward parameter declaration,
1583 indicated by TREE_ASM_WRITTEN on the old declaration - this is
1584 an extension, the mandatory diagnostic for which is handled by
1585 mark_forward_parm_decls. */
1587 if (TREE_CODE (newdecl) == PARM_DECL
1588 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
1590 error ("redefinition of parameter %q+D", newdecl);
1591 locate_old_decl (olddecl, error);
1596 /* Optional warning for completely redundant decls. */
1597 if (!warned && !pedwarned
1598 && warn_redundant_decls
1599 /* Don't warn about a function declaration followed by a
1601 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1602 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
1603 /* Don't warn about redundant redeclarations of builtins. */
1604 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1605 && !DECL_BUILT_IN (newdecl)
1606 && DECL_BUILT_IN (olddecl)
1607 && !C_DECL_DECLARED_BUILTIN (olddecl))
1608 /* Don't warn about an extern followed by a definition. */
1609 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
1610 /* Don't warn about forward parameter decls. */
1611 && !(TREE_CODE (newdecl) == PARM_DECL
1612 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1613 /* Don't warn about a variable definition following a declaration. */
1614 && !(TREE_CODE (newdecl) == VAR_DECL
1615 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl)))
1617 warning (OPT_Wredundant_decls, "redundant redeclaration of %q+D",
1622 /* Report location of previous decl/defn in a consistent manner. */
1623 if (warned || pedwarned)
1624 locate_old_decl (olddecl, pedwarned ? pedwarn : warning0);
1626 #undef DECL_EXTERN_INLINE
1631 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1632 consistent with OLDDECL, but carries new information. Merge the
1633 new information into OLDDECL. This function issues no
1637 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
1639 bool new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1640 && DECL_INITIAL (newdecl) != 0);
1641 bool new_is_prototype = (TREE_CODE (newdecl) == FUNCTION_DECL
1642 && TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0);
1643 bool old_is_prototype = (TREE_CODE (olddecl) == FUNCTION_DECL
1644 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) != 0);
1645 bool extern_changed = false;
1647 /* For real parm decl following a forward decl, rechain the old decl
1648 in its new location and clear TREE_ASM_WRITTEN (it's not a
1649 forward decl anymore). */
1650 if (TREE_CODE (newdecl) == PARM_DECL
1651 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
1653 struct c_binding *b, **here;
1655 for (here = ¤t_scope->bindings; *here; here = &(*here)->prev)
1656 if ((*here)->decl == olddecl)
1663 b->prev = current_scope->bindings;
1664 current_scope->bindings = b;
1666 TREE_ASM_WRITTEN (olddecl) = 0;
1669 DECL_ATTRIBUTES (newdecl)
1670 = targetm.merge_decl_attributes (olddecl, newdecl);
1672 /* Merge the data types specified in the two decls. */
1674 = TREE_TYPE (olddecl)
1675 = composite_type (newtype, oldtype);
1677 /* Lay the type out, unless already done. */
1678 if (!comptypes (oldtype, TREE_TYPE (newdecl)))
1680 if (TREE_TYPE (newdecl) != error_mark_node)
1681 layout_type (TREE_TYPE (newdecl));
1682 if (TREE_CODE (newdecl) != FUNCTION_DECL
1683 && TREE_CODE (newdecl) != TYPE_DECL
1684 && TREE_CODE (newdecl) != CONST_DECL)
1685 layout_decl (newdecl, 0);
1689 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1690 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1691 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1692 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1693 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1695 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1696 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1701 /* Merge the type qualifiers. */
1702 if (TREE_READONLY (newdecl))
1703 TREE_READONLY (olddecl) = 1;
1705 if (TREE_THIS_VOLATILE (newdecl))
1706 TREE_THIS_VOLATILE (olddecl) = 1;
1708 /* Merge deprecatedness. */
1709 if (TREE_DEPRECATED (newdecl))
1710 TREE_DEPRECATED (olddecl) = 1;
1712 /* Keep source location of definition rather than declaration and of
1713 prototype rather than non-prototype unless that prototype is
1715 if ((DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1716 || (old_is_prototype && !new_is_prototype
1717 && !C_DECL_BUILTIN_PROTOTYPE (olddecl)))
1718 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1720 /* Merge the initialization information. */
1721 if (DECL_INITIAL (newdecl) == 0)
1722 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1724 /* Merge the threadprivate attribute. */
1725 if (TREE_CODE (olddecl) == VAR_DECL && C_DECL_THREADPRIVATE_P (olddecl))
1727 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1728 C_DECL_THREADPRIVATE_P (newdecl) = 1;
1731 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS))
1733 /* Merge the unused-warning information. */
1734 if (DECL_IN_SYSTEM_HEADER (olddecl))
1735 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1736 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1737 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1739 /* Merge the section attribute.
1740 We want to issue an error if the sections conflict but that
1741 must be done later in decl_attributes since we are called
1742 before attributes are assigned. */
1743 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1744 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1746 /* Copy the assembler name.
1747 Currently, it can only be defined in the prototype. */
1748 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1750 /* Use visibility of whichever declaration had it specified */
1751 if (DECL_VISIBILITY_SPECIFIED (olddecl))
1753 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1754 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
1757 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1759 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1760 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1761 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1762 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1763 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1764 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1765 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1766 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1767 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1768 DECL_IS_NOVOPS (newdecl) |= DECL_IS_NOVOPS (olddecl);
1771 /* Merge the storage class information. */
1772 merge_weak (newdecl, olddecl);
1774 /* For functions, static overrides non-static. */
1775 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1777 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1778 /* This is since we don't automatically
1779 copy the attributes of NEWDECL into OLDDECL. */
1780 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1781 /* If this clears `static', clear it in the identifier too. */
1782 if (!TREE_PUBLIC (olddecl))
1783 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1787 /* In c99, 'extern' declaration before (or after) 'inline' means this
1788 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
1790 if (TREE_CODE (newdecl) == FUNCTION_DECL
1791 && !flag_gnu89_inline
1792 && (DECL_DECLARED_INLINE_P (newdecl)
1793 || DECL_DECLARED_INLINE_P (olddecl))
1794 && (!DECL_DECLARED_INLINE_P (newdecl)
1795 || !DECL_DECLARED_INLINE_P (olddecl)
1796 || !DECL_EXTERNAL (olddecl))
1797 && DECL_EXTERNAL (newdecl)
1798 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl)))
1799 DECL_EXTERNAL (newdecl) = 0;
1801 if (DECL_EXTERNAL (newdecl))
1803 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1804 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1806 /* An extern decl does not override previous storage class. */
1807 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1808 if (!DECL_EXTERNAL (newdecl))
1810 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1811 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1816 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1817 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1820 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1822 /* If we're redefining a function previously defined as extern
1823 inline, make sure we emit debug info for the inline before we
1824 throw it away, in case it was inlined into a function that
1825 hasn't been written out yet. */
1826 if (new_is_definition && DECL_INITIAL (olddecl))
1828 if (TREE_USED (olddecl)
1829 /* In unit-at-a-time mode we never inline re-defined extern
1830 inline functions. */
1831 && !flag_unit_at_a_time
1832 && cgraph_function_possibly_inlined_p (olddecl))
1833 (*debug_hooks->outlining_inline_function) (olddecl);
1835 /* The new defn must not be inline. */
1836 DECL_INLINE (newdecl) = 0;
1837 DECL_UNINLINABLE (newdecl) = 1;
1841 /* If either decl says `inline', this fn is inline, unless
1842 its definition was passed already. */
1843 if (DECL_DECLARED_INLINE_P (newdecl)
1844 || DECL_DECLARED_INLINE_P (olddecl))
1845 DECL_DECLARED_INLINE_P (newdecl) = 1;
1847 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1848 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1851 if (DECL_BUILT_IN (olddecl))
1853 /* If redeclaring a builtin function, it stays built in.
1854 But it gets tagged as having been declared. */
1855 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1856 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1857 C_DECL_DECLARED_BUILTIN (newdecl) = 1;
1858 if (new_is_prototype)
1859 C_DECL_BUILTIN_PROTOTYPE (newdecl) = 0;
1861 C_DECL_BUILTIN_PROTOTYPE (newdecl)
1862 = C_DECL_BUILTIN_PROTOTYPE (olddecl);
1865 /* Also preserve various other info from the definition. */
1866 if (!new_is_definition)
1868 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1869 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1870 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1871 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1872 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1874 /* Set DECL_INLINE on the declaration if we've got a body
1875 from which to instantiate. */
1876 if (DECL_INLINE (olddecl) && !DECL_UNINLINABLE (newdecl))
1878 DECL_INLINE (newdecl) = 1;
1879 DECL_ABSTRACT_ORIGIN (newdecl)
1880 = DECL_ABSTRACT_ORIGIN (olddecl);
1885 /* If a previous declaration said inline, mark the
1886 definition as inlinable. */
1887 if (DECL_DECLARED_INLINE_P (newdecl)
1888 && !DECL_UNINLINABLE (newdecl))
1889 DECL_INLINE (newdecl) = 1;
1893 extern_changed = DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl);
1895 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1896 But preserve OLDDECL's DECL_UID and DECL_CONTEXT. */
1898 unsigned olddecl_uid = DECL_UID (olddecl);
1899 tree olddecl_context = DECL_CONTEXT (olddecl);
1901 memcpy ((char *) olddecl + sizeof (struct tree_common),
1902 (char *) newdecl + sizeof (struct tree_common),
1903 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
1904 switch (TREE_CODE (olddecl))
1914 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1915 (char *) newdecl + sizeof (struct tree_decl_common),
1916 tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common));
1921 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1922 (char *) newdecl + sizeof (struct tree_decl_common),
1923 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common));
1925 DECL_UID (olddecl) = olddecl_uid;
1926 DECL_CONTEXT (olddecl) = olddecl_context;
1929 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1930 so that encode_section_info has a chance to look at the new decl
1931 flags and attributes. */
1932 if (DECL_RTL_SET_P (olddecl)
1933 && (TREE_CODE (olddecl) == FUNCTION_DECL
1934 || (TREE_CODE (olddecl) == VAR_DECL
1935 && TREE_STATIC (olddecl))))
1936 make_decl_rtl (olddecl);
1938 /* If we changed a function from DECL_EXTERNAL to !DECL_EXTERNAL,
1939 and the definition is coming from the old version, cgraph needs
1940 to be called again. */
1941 if (extern_changed && !new_is_definition
1942 && TREE_CODE (olddecl) == FUNCTION_DECL && DECL_INITIAL (olddecl))
1943 cgraph_finalize_function (olddecl, false);
1946 /* Handle when a new declaration NEWDECL has the same name as an old
1947 one OLDDECL in the same binding contour. Prints an error message
1950 If safely possible, alter OLDDECL to look like NEWDECL, and return
1951 true. Otherwise, return false. */
1954 duplicate_decls (tree newdecl, tree olddecl)
1956 tree newtype = NULL, oldtype = NULL;
1958 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
1960 /* Avoid `unused variable' and other warnings warnings for OLDDECL. */
1961 TREE_NO_WARNING (olddecl) = 1;
1965 merge_decls (newdecl, olddecl, newtype, oldtype);
1970 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
1972 warn_if_shadowing (tree new_decl)
1974 struct c_binding *b;
1976 /* Shadow warnings wanted? */
1978 /* No shadow warnings for internally generated vars. */
1979 || DECL_IS_BUILTIN (new_decl)
1980 /* No shadow warnings for vars made for inlining. */
1981 || DECL_FROM_INLINE (new_decl))
1984 /* Is anything being shadowed? Invisible decls do not count. */
1985 for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed)
1986 if (b->decl && b->decl != new_decl && !b->invisible)
1988 tree old_decl = b->decl;
1990 if (old_decl == error_mark_node)
1992 warning (OPT_Wshadow, "declaration of %q+D shadows previous "
1993 "non-variable", new_decl);
1996 else if (TREE_CODE (old_decl) == PARM_DECL)
1997 warning (OPT_Wshadow, "declaration of %q+D shadows a parameter",
1999 else if (DECL_FILE_SCOPE_P (old_decl))
2000 warning (OPT_Wshadow, "declaration of %q+D shadows a global "
2001 "declaration", new_decl);
2002 else if (TREE_CODE (old_decl) == FUNCTION_DECL
2003 && DECL_BUILT_IN (old_decl))
2005 warning (OPT_Wshadow, "declaration of %q+D shadows "
2006 "a built-in function", new_decl);
2010 warning (OPT_Wshadow, "declaration of %q+D shadows a previous local",
2013 warning (OPT_Wshadow, "%Jshadowed declaration is here", old_decl);
2020 /* Subroutine of pushdecl.
2022 X is a TYPE_DECL for a typedef statement. Create a brand new
2023 ..._TYPE node (which will be just a variant of the existing
2024 ..._TYPE node with identical properties) and then install X
2025 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2027 The whole point here is to end up with a situation where each
2028 and every ..._TYPE node the compiler creates will be uniquely
2029 associated with AT MOST one node representing a typedef name.
2030 This way, even though the compiler substitutes corresponding
2031 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2032 early on, later parts of the compiler can always do the reverse
2033 translation and get back the corresponding typedef name. For
2036 typedef struct S MY_TYPE;
2039 Later parts of the compiler might only know that `object' was of
2040 type `struct S' if it were not for code just below. With this
2041 code however, later parts of the compiler see something like:
2043 struct S' == struct S
2044 typedef struct S' MY_TYPE;
2047 And they can then deduce (from the node for type struct S') that
2048 the original object declaration was:
2052 Being able to do this is important for proper support of protoize,
2053 and also for generating precise symbolic debugging information
2054 which takes full account of the programmer's (typedef) vocabulary.
2056 Obviously, we don't want to generate a duplicate ..._TYPE node if
2057 the TYPE_DECL node that we are now processing really represents a
2058 standard built-in type.
2060 Since all standard types are effectively declared at line zero
2061 in the source file, we can easily check to see if we are working
2062 on a standard type by checking the current value of lineno. */
2065 clone_underlying_type (tree x)
2067 if (DECL_IS_BUILTIN (x))
2069 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2070 TYPE_NAME (TREE_TYPE (x)) = x;
2072 else if (TREE_TYPE (x) != error_mark_node
2073 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2075 tree tt = TREE_TYPE (x);
2076 DECL_ORIGINAL_TYPE (x) = tt;
2077 tt = build_variant_type_copy (tt);
2079 TREE_USED (tt) = TREE_USED (x);
2084 /* Record a decl-node X as belonging to the current lexical scope.
2085 Check for errors (such as an incompatible declaration for the same
2086 name already seen in the same scope).
2088 Returns either X or an old decl for the same name.
2089 If an old decl is returned, it may have been smashed
2090 to agree with what X says. */
2095 tree name = DECL_NAME (x);
2096 struct c_scope *scope = current_scope;
2097 struct c_binding *b;
2098 bool nested = false;
2100 /* Functions need the lang_decl data. */
2101 if (TREE_CODE (x) == FUNCTION_DECL && !DECL_LANG_SPECIFIC (x))
2102 DECL_LANG_SPECIFIC (x) = GGC_CNEW (struct lang_decl);
2104 /* Must set DECL_CONTEXT for everything not at file scope or
2105 DECL_FILE_SCOPE_P won't work. Local externs don't count
2106 unless they have initializers (which generate code). */
2107 if (current_function_decl
2108 && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL)
2109 || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
2110 DECL_CONTEXT (x) = current_function_decl;
2112 /* If this is of variably modified type, prevent jumping into its
2114 if ((TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == TYPE_DECL)
2115 && variably_modified_type_p (TREE_TYPE (x), NULL_TREE))
2116 c_begin_vm_scope (scope->depth);
2118 /* Anonymous decls are just inserted in the scope. */
2121 bind (name, x, scope, /*invisible=*/false, /*nested=*/false);
2125 /* First, see if there is another declaration with the same name in
2126 the current scope. If there is, duplicate_decls may do all the
2127 work for us. If duplicate_decls returns false, that indicates
2128 two incompatible decls in the same scope; we are to silently
2129 replace the old one (duplicate_decls has issued all appropriate
2130 diagnostics). In particular, we should not consider possible
2131 duplicates in the external scope, or shadowing. */
2132 b = I_SYMBOL_BINDING (name);
2133 if (b && B_IN_SCOPE (b, scope))
2135 struct c_binding *b_ext, *b_use;
2136 tree type = TREE_TYPE (x);
2137 tree visdecl = b->decl;
2138 tree vistype = TREE_TYPE (visdecl);
2139 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
2140 && COMPLETE_TYPE_P (TREE_TYPE (x)))
2141 b->inner_comp = false;
2144 /* If this is an external linkage declaration, we should check
2145 for compatibility with the type in the external scope before
2146 setting the type at this scope based on the visible
2147 information only. */
2148 if (TREE_PUBLIC (x) && TREE_PUBLIC (visdecl))
2150 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
2151 b_ext = b_ext->shadowed;
2156 TREE_TYPE (b_use->decl) = b_use->type;
2159 if (duplicate_decls (x, b_use->decl))
2163 /* Save the updated type in the external scope and
2164 restore the proper type for this scope. */
2166 if (comptypes (vistype, type))
2167 thistype = composite_type (vistype, type);
2169 thistype = TREE_TYPE (b_use->decl);
2170 b_use->type = TREE_TYPE (b_use->decl);
2171 if (TREE_CODE (b_use->decl) == FUNCTION_DECL
2172 && DECL_BUILT_IN (b_use->decl))
2174 = build_type_attribute_variant (thistype,
2177 TREE_TYPE (b_use->decl) = thistype;
2182 goto skip_external_and_shadow_checks;
2185 /* All declarations with external linkage, and all external
2186 references, go in the external scope, no matter what scope is
2187 current. However, the binding in that scope is ignored for
2188 purposes of normal name lookup. A separate binding structure is
2189 created in the requested scope; this governs the normal
2190 visibility of the symbol.
2192 The binding in the externals scope is used exclusively for
2193 detecting duplicate declarations of the same object, no matter
2194 what scope they are in; this is what we do here. (C99 6.2.7p2:
2195 All declarations that refer to the same object or function shall
2196 have compatible type; otherwise, the behavior is undefined.) */
2197 if (DECL_EXTERNAL (x) || scope == file_scope)
2199 tree type = TREE_TYPE (x);
2202 bool type_saved = false;
2203 if (b && !B_IN_EXTERNAL_SCOPE (b)
2204 && (TREE_CODE (b->decl) == FUNCTION_DECL
2205 || TREE_CODE (b->decl) == VAR_DECL)
2206 && DECL_FILE_SCOPE_P (b->decl))
2209 vistype = TREE_TYPE (visdecl);
2211 if (scope != file_scope
2212 && !DECL_IN_SYSTEM_HEADER (x))
2213 warning (OPT_Wnested_externs, "nested extern declaration of %qD", x);
2215 while (b && !B_IN_EXTERNAL_SCOPE (b))
2217 /* If this decl might be modified, save its type. This is
2218 done here rather than when the decl is first bound
2219 because the type may change after first binding, through
2220 being completed or through attributes being added. If we
2221 encounter multiple such decls, only the first should have
2222 its type saved; the others will already have had their
2223 proper types saved and the types will not have changed as
2224 their scopes will not have been re-entered. */
2225 if (DECL_P (b->decl) && DECL_FILE_SCOPE_P (b->decl) && !type_saved)
2227 b->type = TREE_TYPE (b->decl);
2230 if (B_IN_FILE_SCOPE (b)
2231 && TREE_CODE (b->decl) == VAR_DECL
2232 && TREE_STATIC (b->decl)
2233 && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE
2234 && !TYPE_DOMAIN (TREE_TYPE (b->decl))
2235 && TREE_CODE (type) == ARRAY_TYPE
2236 && TYPE_DOMAIN (type)
2237 && TYPE_MAX_VALUE (TYPE_DOMAIN (type))
2238 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
2240 /* Array type completed in inner scope, which should be
2241 diagnosed if the completion does not have size 1 and
2242 it does not get completed in the file scope. */
2243 b->inner_comp = true;
2248 /* If a matching external declaration has been found, set its
2249 type to the composite of all the types of that declaration.
2250 After the consistency checks, it will be reset to the
2251 composite of the visible types only. */
2252 if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2254 TREE_TYPE (b->decl) = b->type;
2256 /* The point of the same_translation_unit_p check here is,
2257 we want to detect a duplicate decl for a construct like
2258 foo() { extern bar(); } ... static bar(); but not if
2259 they are in different translation units. In any case,
2260 the static does not go in the externals scope. */
2262 && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2263 && duplicate_decls (x, b->decl))
2268 if (comptypes (vistype, type))
2269 thistype = composite_type (vistype, type);
2271 thistype = TREE_TYPE (b->decl);
2275 b->type = TREE_TYPE (b->decl);
2276 if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl))
2278 = build_type_attribute_variant (thistype,
2279 TYPE_ATTRIBUTES (b->type));
2280 TREE_TYPE (b->decl) = thistype;
2281 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true);
2284 else if (TREE_PUBLIC (x))
2286 if (visdecl && !b && duplicate_decls (x, visdecl))
2288 /* An external declaration at block scope referring to a
2289 visible entity with internal linkage. The composite
2290 type will already be correct for this scope, so we
2291 just need to fall through to make the declaration in
2298 bind (name, x, external_scope, /*invisible=*/true,
2305 if (TREE_CODE (x) != PARM_DECL)
2306 warn_if_shadowing (x);
2308 skip_external_and_shadow_checks:
2309 if (TREE_CODE (x) == TYPE_DECL)
2310 clone_underlying_type (x);
2312 bind (name, x, scope, /*invisible=*/false, nested);
2314 /* If x's type is incomplete because it's based on a
2315 structure or union which has not yet been fully declared,
2316 attach it to that structure or union type, so we can go
2317 back and complete the variable declaration later, if the
2318 structure or union gets fully declared.
2320 If the input is erroneous, we can have error_mark in the type
2321 slot (e.g. "f(void a, ...)") - that doesn't count as an
2323 if (TREE_TYPE (x) != error_mark_node
2324 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2326 tree element = TREE_TYPE (x);
2328 while (TREE_CODE (element) == ARRAY_TYPE)
2329 element = TREE_TYPE (element);
2330 element = TYPE_MAIN_VARIANT (element);
2332 if ((TREE_CODE (element) == RECORD_TYPE
2333 || TREE_CODE (element) == UNION_TYPE)
2334 && (TREE_CODE (x) != TYPE_DECL
2335 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
2336 && !COMPLETE_TYPE_P (element))
2337 C_TYPE_INCOMPLETE_VARS (element)
2338 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
2343 /* Record X as belonging to file scope.
2344 This is used only internally by the Objective-C front end,
2345 and is limited to its needs. duplicate_decls is not called;
2346 if there is any preexisting decl for this identifier, it is an ICE. */
2349 pushdecl_top_level (tree x)
2352 bool nested = false;
2353 gcc_assert (TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == CONST_DECL);
2355 name = DECL_NAME (x);
2357 gcc_assert (TREE_CODE (x) == CONST_DECL || !I_SYMBOL_BINDING (name));
2359 if (TREE_PUBLIC (x))
2361 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false);
2365 bind (name, x, file_scope, /*invisible=*/false, nested);
2371 implicit_decl_warning (tree id, tree olddecl)
2373 void (*diag) (const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2);
2374 switch (mesg_implicit_function_declaration)
2377 case 1: diag = warning0; break;
2378 case 2: diag = error; break;
2379 default: gcc_unreachable ();
2382 diag (G_("implicit declaration of function %qE"), id);
2384 locate_old_decl (olddecl, diag);
2387 /* Generate an implicit declaration for identifier FUNCTIONID as a
2388 function of type int (). */
2391 implicitly_declare (tree functionid)
2393 struct c_binding *b;
2397 for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed)
2399 if (B_IN_SCOPE (b, external_scope))
2408 if (decl == error_mark_node)
2411 /* FIXME: Objective-C has weird not-really-builtin functions
2412 which are supposed to be visible automatically. They wind up
2413 in the external scope because they're pushed before the file
2414 scope gets created. Catch this here and rebind them into the
2416 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
2418 bind (functionid, decl, file_scope,
2419 /*invisible=*/false, /*nested=*/true);
2424 tree newtype = default_function_type;
2426 TREE_TYPE (decl) = b->type;
2427 /* Implicit declaration of a function already declared
2428 (somehow) in a different scope, or as a built-in.
2429 If this is the first time this has happened, warn;
2430 then recycle the old declaration but with the new type. */
2431 if (!C_DECL_IMPLICIT (decl))
2433 implicit_decl_warning (functionid, decl);
2434 C_DECL_IMPLICIT (decl) = 1;
2436 if (DECL_BUILT_IN (decl))
2438 newtype = build_type_attribute_variant (newtype,
2440 (TREE_TYPE (decl)));
2441 if (!comptypes (newtype, TREE_TYPE (decl)))
2443 warning (0, "incompatible implicit declaration of built-in"
2444 " function %qD", decl);
2445 newtype = TREE_TYPE (decl);
2450 if (!comptypes (newtype, TREE_TYPE (decl)))
2452 error ("incompatible implicit declaration of function %qD",
2454 locate_old_decl (decl, error);
2457 b->type = TREE_TYPE (decl);
2458 TREE_TYPE (decl) = newtype;
2459 bind (functionid, decl, current_scope,
2460 /*invisible=*/false, /*nested=*/true);
2465 /* Not seen before. */
2466 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2467 DECL_EXTERNAL (decl) = 1;
2468 TREE_PUBLIC (decl) = 1;
2469 C_DECL_IMPLICIT (decl) = 1;
2470 implicit_decl_warning (functionid, 0);
2471 asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL);
2473 set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree));
2475 /* C89 says implicit declarations are in the innermost block.
2476 So we record the decl in the standard fashion. */
2477 decl = pushdecl (decl);
2479 /* No need to call objc_check_decl here - it's a function type. */
2480 rest_of_decl_compilation (decl, 0, 0);
2482 /* Write a record describing this implicit function declaration
2483 to the prototypes file (if requested). */
2484 gen_aux_info_record (decl, 0, 1, 0);
2486 /* Possibly apply some default attributes to this implicit declaration. */
2487 decl_attributes (&decl, NULL_TREE, 0);
2492 /* Issue an error message for a reference to an undeclared variable
2493 ID, including a reference to a builtin outside of function-call
2494 context. Establish a binding of the identifier to error_mark_node
2495 in an appropriate scope, which will suppress further errors for the
2496 same identifier. The error message should be given location LOC. */
2498 undeclared_variable (tree id, location_t loc)
2500 static bool already = false;
2501 struct c_scope *scope;
2503 if (current_function_decl == 0)
2505 error ("%H%qE undeclared here (not in a function)", &loc, id);
2506 scope = current_scope;
2510 error ("%H%qE undeclared (first use in this function)", &loc, id);
2514 error ("%H(Each undeclared identifier is reported only once", &loc);
2515 error ("%Hfor each function it appears in.)", &loc);
2519 /* If we are parsing old-style parameter decls, current_function_decl
2520 will be nonnull but current_function_scope will be null. */
2521 scope = current_function_scope ? current_function_scope : current_scope;
2523 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false);
2526 /* Subroutine of lookup_label, declare_label, define_label: construct a
2527 LABEL_DECL with all the proper frills. */
2530 make_label (tree name, location_t location)
2532 tree label = build_decl (LABEL_DECL, name, void_type_node);
2534 DECL_CONTEXT (label) = current_function_decl;
2535 DECL_MODE (label) = VOIDmode;
2536 DECL_SOURCE_LOCATION (label) = location;
2541 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
2542 Create one if none exists so far for the current function.
2543 This is called when a label is used in a goto expression or
2544 has its address taken. */
2547 lookup_label (tree name)
2551 if (current_function_decl == 0)
2553 error ("label %qE referenced outside of any function", name);
2557 /* Use a label already defined or ref'd with this name, but not if
2558 it is inherited from a containing function and wasn't declared
2560 label = I_LABEL_DECL (name);
2561 if (label && (DECL_CONTEXT (label) == current_function_decl
2562 || C_DECLARED_LABEL_FLAG (label)))
2564 /* If the label has only been declared, update its apparent
2565 location to point here, for better diagnostics if it
2566 turns out not to have been defined. */
2567 if (!TREE_USED (label))
2568 DECL_SOURCE_LOCATION (label) = input_location;
2572 /* No label binding for that identifier; make one. */
2573 label = make_label (name, input_location);
2575 /* Ordinary labels go in the current function scope. */
2576 bind (name, label, current_function_scope,
2577 /*invisible=*/false, /*nested=*/false);
2581 /* Make a label named NAME in the current function, shadowing silently
2582 any that may be inherited from containing functions or containing
2583 scopes. This is called for __label__ declarations. */
2586 declare_label (tree name)
2588 struct c_binding *b = I_LABEL_BINDING (name);
2591 /* Check to make sure that the label hasn't already been declared
2593 if (b && B_IN_CURRENT_SCOPE (b))
2595 error ("duplicate label declaration %qE", name);
2596 locate_old_decl (b->decl, error);
2598 /* Just use the previous declaration. */
2602 label = make_label (name, input_location);
2603 C_DECLARED_LABEL_FLAG (label) = 1;
2605 /* Declared labels go in the current scope. */
2606 bind (name, label, current_scope,
2607 /*invisible=*/false, /*nested=*/false);
2611 /* Define a label, specifying the location in the source file.
2612 Return the LABEL_DECL node for the label, if the definition is valid.
2613 Otherwise return 0. */
2616 define_label (location_t location, tree name)
2618 /* Find any preexisting label with this name. It is an error
2619 if that label has already been defined in this function, or
2620 if there is a containing function with a declared label with
2622 tree label = I_LABEL_DECL (name);
2623 struct c_label_list *nlist_se, *nlist_vm;
2626 && ((DECL_CONTEXT (label) == current_function_decl
2627 && DECL_INITIAL (label) != 0)
2628 || (DECL_CONTEXT (label) != current_function_decl
2629 && C_DECLARED_LABEL_FLAG (label))))
2631 error ("%Hduplicate label %qD", &location, label);
2632 locate_old_decl (label, error);
2635 else if (label && DECL_CONTEXT (label) == current_function_decl)
2637 /* The label has been used or declared already in this function,
2638 but not defined. Update its location to point to this
2640 if (C_DECL_UNDEFINABLE_STMT_EXPR (label))
2641 error ("%Jjump into statement expression", label);
2642 if (C_DECL_UNDEFINABLE_VM (label))
2643 error ("%Jjump into scope of identifier with variably modified type",
2645 DECL_SOURCE_LOCATION (label) = location;
2649 /* No label binding for that identifier; make one. */
2650 label = make_label (name, location);
2652 /* Ordinary labels go in the current function scope. */
2653 bind (name, label, current_function_scope,
2654 /*invisible=*/false, /*nested=*/false);
2657 if (!in_system_header && lookup_name (name))
2658 warning (OPT_Wtraditional, "%Htraditional C lacks a separate namespace "
2659 "for labels, identifier %qE conflicts", &location, name);
2661 nlist_se = XOBNEW (&parser_obstack, struct c_label_list);
2662 nlist_se->next = label_context_stack_se->labels_def;
2663 nlist_se->label = label;
2664 label_context_stack_se->labels_def = nlist_se;
2666 nlist_vm = XOBNEW (&parser_obstack, struct c_label_list);
2667 nlist_vm->next = label_context_stack_vm->labels_def;
2668 nlist_vm->label = label;
2669 label_context_stack_vm->labels_def = nlist_vm;
2671 /* Mark label as having been defined. */
2672 DECL_INITIAL (label) = error_mark_node;
2676 /* Given NAME, an IDENTIFIER_NODE,
2677 return the structure (or union or enum) definition for that name.
2678 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2679 CODE says which kind of type the caller wants;
2680 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2681 If the wrong kind of type is found, an error is reported. */
2684 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2686 struct c_binding *b = I_TAG_BINDING (name);
2692 /* We only care about whether it's in this level if
2693 thislevel_only was set or it might be a type clash. */
2694 if (thislevel_only || TREE_CODE (b->decl) != code)
2696 /* For our purposes, a tag in the external scope is the same as
2697 a tag in the file scope. (Primarily relevant to Objective-C
2698 and its builtin structure tags, which get pushed before the
2699 file scope is created.) */
2700 if (B_IN_CURRENT_SCOPE (b)
2701 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
2705 if (thislevel_only && !thislevel)
2708 if (TREE_CODE (b->decl) != code)
2710 /* Definition isn't the kind we were looking for. */
2711 pending_invalid_xref = name;
2712 pending_invalid_xref_location = input_location;
2714 /* If in the same binding level as a declaration as a tag
2715 of a different type, this must not be allowed to
2716 shadow that tag, so give the error immediately.
2717 (For example, "struct foo; union foo;" is invalid.) */
2719 pending_xref_error ();
2724 /* Print an error message now
2725 for a recent invalid struct, union or enum cross reference.
2726 We don't print them immediately because they are not invalid
2727 when used in the `struct foo;' construct for shadowing. */
2730 pending_xref_error (void)
2732 if (pending_invalid_xref != 0)
2733 error ("%H%qE defined as wrong kind of tag",
2734 &pending_invalid_xref_location, pending_invalid_xref);
2735 pending_invalid_xref = 0;
2739 /* Look up NAME in the current scope and its superiors
2740 in the namespace of variables, functions and typedefs.
2741 Return a ..._DECL node of some kind representing its definition,
2742 or return 0 if it is undefined. */
2745 lookup_name (tree name)
2747 struct c_binding *b = I_SYMBOL_BINDING (name);
2748 if (b && !b->invisible)
2753 /* Similar to `lookup_name' but look only at the indicated scope. */
2756 lookup_name_in_scope (tree name, struct c_scope *scope)
2758 struct c_binding *b;
2760 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
2761 if (B_IN_SCOPE (b, scope))
2766 /* Create the predefined scalar types of C,
2767 and some nodes representing standard constants (0, 1, (void *) 0).
2768 Initialize the global scope.
2769 Make definitions for built-in primitive functions. */
2772 c_init_decl_processing (void)
2774 location_t save_loc = input_location;
2776 /* Initialize reserved words for parser. */
2779 current_function_decl = 0;
2781 gcc_obstack_init (&parser_obstack);
2783 /* Make the externals scope. */
2785 external_scope = current_scope;
2787 /* Declarations from c_common_nodes_and_builtins must not be associated
2788 with this input file, lest we get differences between using and not
2789 using preprocessed headers. */
2790 #ifdef USE_MAPPED_LOCATION
2791 input_location = BUILTINS_LOCATION;
2793 input_location.file = "<built-in>";
2794 input_location.line = 0;
2797 build_common_tree_nodes (flag_signed_char, false);
2799 c_common_nodes_and_builtins ();
2801 /* In C, comparisons and TRUTH_* expressions have type int. */
2802 truthvalue_type_node = integer_type_node;
2803 truthvalue_true_node = integer_one_node;
2804 truthvalue_false_node = integer_zero_node;
2806 /* Even in C99, which has a real boolean type. */
2807 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2808 boolean_type_node));
2810 input_location = save_loc;
2812 pedantic_lvalues = true;
2814 make_fname_decl = c_make_fname_decl;
2815 start_fname_decls ();
2818 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2819 decl, NAME is the initialization string and TYPE_DEP indicates whether
2820 NAME depended on the type of the function. As we don't yet implement
2821 delayed emission of static data, we mark the decl as emitted
2822 so it is not placed in the output. Anything using it must therefore pull
2823 out the STRING_CST initializer directly. FIXME. */
2826 c_make_fname_decl (tree id, int type_dep)
2828 const char *name = fname_as_string (type_dep);
2829 tree decl, type, init;
2830 size_t length = strlen (name);
2832 type = build_array_type (char_type_node,
2833 build_index_type (size_int (length)));
2834 type = c_build_qualified_type (type, TYPE_QUAL_CONST);
2836 decl = build_decl (VAR_DECL, id, type);
2838 TREE_STATIC (decl) = 1;
2839 TREE_READONLY (decl) = 1;
2840 DECL_ARTIFICIAL (decl) = 1;
2842 init = build_string (length + 1, name);
2843 free ((char *) name);
2844 TREE_TYPE (init) = type;
2845 DECL_INITIAL (decl) = init;
2847 TREE_USED (decl) = 1;
2849 if (current_function_decl
2850 /* For invalid programs like this:
2853 const char* p = __FUNCTION__;
2855 the __FUNCTION__ is believed to appear in K&R style function
2856 parameter declarator. In that case we still don't have
2858 && (!errorcount || current_function_scope))
2860 DECL_CONTEXT (decl) = current_function_decl;
2861 bind (id, decl, current_function_scope,
2862 /*invisible=*/false, /*nested=*/false);
2865 finish_decl (decl, init, NULL_TREE);
2870 /* Return a definition for a builtin function named NAME and whose data type
2871 is TYPE. TYPE should be a function type with argument types.
2872 FUNCTION_CODE tells later passes how to compile calls to this function.
2873 See tree.h for its possible values.
2875 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2876 the name to be called if we can't opencode the function. If
2877 ATTRS is nonzero, use that for the function's attribute list. */
2880 builtin_function (const char *name, tree type, int function_code,
2881 enum built_in_class cl, const char *library_name,
2884 tree id = get_identifier (name);
2885 tree decl = build_decl (FUNCTION_DECL, id, type);
2886 TREE_PUBLIC (decl) = 1;
2887 DECL_EXTERNAL (decl) = 1;
2888 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
2889 DECL_BUILT_IN_CLASS (decl) = cl;
2890 DECL_FUNCTION_CODE (decl) = function_code;
2891 C_DECL_BUILTIN_PROTOTYPE (decl) = (TYPE_ARG_TYPES (type) != 0);
2893 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2895 /* Should never be called on a symbol with a preexisting meaning. */
2896 gcc_assert (!I_SYMBOL_BINDING (id));
2898 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false);
2900 /* Builtins in the implementation namespace are made visible without
2901 needing to be explicitly declared. See push_file_scope. */
2902 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
2904 TREE_CHAIN (decl) = visible_builtins;
2905 visible_builtins = decl;
2908 /* Possibly apply some default attributes to this built-in function. */
2910 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2912 decl_attributes (&decl, NULL_TREE, 0);
2917 /* Called when a declaration is seen that contains no names to declare.
2918 If its type is a reference to a structure, union or enum inherited
2919 from a containing scope, shadow that tag name for the current scope
2920 with a forward reference.
2921 If its type defines a new named structure or union
2922 or defines an enum, it is valid but we need not do anything here.
2923 Otherwise, it is an error. */
2926 shadow_tag (const struct c_declspecs *declspecs)
2928 shadow_tag_warned (declspecs, 0);
2931 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
2934 shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
2936 bool found_tag = false;
2938 if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p)
2940 tree value = declspecs->type;
2941 enum tree_code code = TREE_CODE (value);
2943 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2944 /* Used to test also that TYPE_SIZE (value) != 0.
2945 That caused warning for `struct foo;' at top level in the file. */
2947 tree name = TYPE_NAME (value);
2954 if (warned != 1 && code != ENUMERAL_TYPE)
2955 /* Empty unnamed enum OK */
2957 pedwarn ("unnamed struct/union that defines no instances");
2961 else if (!declspecs->tag_defined_p
2962 && declspecs->storage_class != csc_none)
2965 pedwarn ("empty declaration with storage class specifier "
2966 "does not redeclare tag");
2968 pending_xref_error ();
2970 else if (!declspecs->tag_defined_p
2971 && (declspecs->const_p
2972 || declspecs->volatile_p
2973 || declspecs->restrict_p))
2976 pedwarn ("empty declaration with type qualifier "
2977 "does not redeclare tag");
2979 pending_xref_error ();
2983 pending_invalid_xref = 0;
2984 t = lookup_tag (code, name, 1);
2988 t = make_node (code);
2995 if (warned != 1 && !in_system_header)
2997 pedwarn ("useless type name in empty declaration");
3002 else if (warned != 1 && !in_system_header && declspecs->typedef_p)
3004 pedwarn ("useless type name in empty declaration");
3008 pending_invalid_xref = 0;
3010 if (declspecs->inline_p)
3012 error ("%<inline%> in empty declaration");
3016 if (current_scope == file_scope && declspecs->storage_class == csc_auto)
3018 error ("%<auto%> in file-scope empty declaration");
3022 if (current_scope == file_scope && declspecs->storage_class == csc_register)
3024 error ("%<register%> in file-scope empty declaration");
3028 if (!warned && !in_system_header && declspecs->storage_class != csc_none)
3030 warning (0, "useless storage class specifier in empty declaration");
3034 if (!warned && !in_system_header && declspecs->thread_p)
3036 warning (0, "useless %<__thread%> in empty declaration");
3040 if (!warned && !in_system_header && (declspecs->const_p
3041 || declspecs->volatile_p
3042 || declspecs->restrict_p))
3044 warning (0, "useless type qualifier in empty declaration");
3051 pedwarn ("empty declaration");
3056 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
3057 bits. SPECS represents declaration specifiers that the grammar
3058 only permits to contain type qualifiers and attributes. */
3061 quals_from_declspecs (const struct c_declspecs *specs)
3063 int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0)
3064 | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0)
3065 | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0));
3066 gcc_assert (!specs->type
3067 && !specs->decl_attr
3068 && specs->typespec_word == cts_none
3069 && specs->storage_class == csc_none
3070 && !specs->typedef_p
3071 && !specs->explicit_signed_p
3072 && !specs->deprecated_p
3074 && !specs->long_long_p
3077 && !specs->unsigned_p
3078 && !specs->complex_p
3080 && !specs->thread_p);
3084 /* Construct an array declarator. EXPR is the expression inside [],
3085 or NULL_TREE. QUALS are the type qualifiers inside the [] (to be
3086 applied to the pointer to which a parameter array is converted).
3087 STATIC_P is true if "static" is inside the [], false otherwise.
3088 VLA_UNSPEC_P is true if the array is [*], a VLA of unspecified
3089 length which is nevertheless a complete type, false otherwise. The
3090 field for the contained declarator is left to be filled in by
3091 set_array_declarator_inner. */
3093 struct c_declarator *
3094 build_array_declarator (tree expr, struct c_declspecs *quals, bool static_p,
3097 struct c_declarator *declarator = XOBNEW (&parser_obstack,
3098 struct c_declarator);
3099 declarator->kind = cdk_array;
3100 declarator->declarator = 0;
3101 declarator->u.array.dimen = expr;
3104 declarator->u.array.attrs = quals->attrs;
3105 declarator->u.array.quals = quals_from_declspecs (quals);
3109 declarator->u.array.attrs = NULL_TREE;
3110 declarator->u.array.quals = 0;
3112 declarator->u.array.static_p = static_p;
3113 declarator->u.array.vla_unspec_p = vla_unspec_p;
3114 if (pedantic && !flag_isoc99)
3116 if (static_p || quals != NULL)
3117 pedwarn ("ISO C90 does not support %<static%> or type "
3118 "qualifiers in parameter array declarators");
3120 pedwarn ("ISO C90 does not support %<[*]%> array declarators");
3124 if (!current_scope->parm_flag)
3127 error ("%<[*]%> not allowed in other than function prototype scope");
3128 declarator->u.array.vla_unspec_p = false;
3131 current_scope->had_vla_unspec = true;
3136 /* Set the contained declarator of an array declarator. DECL is the
3137 declarator, as constructed by build_array_declarator; INNER is what
3138 appears on the left of the []. ABSTRACT_P is true if it is an
3139 abstract declarator, false otherwise; this is used to reject static
3140 and type qualifiers in abstract declarators, where they are not in
3141 the C99 grammar (subject to possible change in DR#289). */
3143 struct c_declarator *
3144 set_array_declarator_inner (struct c_declarator *decl,
3145 struct c_declarator *inner, bool abstract_p)
3147 decl->declarator = inner;
3148 if (abstract_p && (decl->u.array.quals != TYPE_UNQUALIFIED
3149 || decl->u.array.attrs != NULL_TREE
3150 || decl->u.array.static_p))
3151 error ("static or type qualifiers in abstract declarator");
3155 /* INIT is a constructor that forms DECL's initializer. If the final
3156 element initializes a flexible array field, add the size of that
3157 initializer to DECL's size. */
3160 add_flexible_array_elts_to_size (tree decl, tree init)
3164 if (VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (init)))
3167 elt = VEC_last (constructor_elt, CONSTRUCTOR_ELTS (init))->value;
3168 type = TREE_TYPE (elt);
3169 if (TREE_CODE (type) == ARRAY_TYPE
3170 && TYPE_SIZE (type) == NULL_TREE
3171 && TYPE_DOMAIN (type) != NULL_TREE
3172 && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) == NULL_TREE)
3174 complete_array_type (&type, elt, false);
3176 = size_binop (PLUS_EXPR, DECL_SIZE (decl), TYPE_SIZE (type));
3177 DECL_SIZE_UNIT (decl)
3178 = size_binop (PLUS_EXPR, DECL_SIZE_UNIT (decl), TYPE_SIZE_UNIT (type));
3182 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3185 groktypename (struct c_type_name *type_name)
3188 tree attrs = type_name->specs->attrs;
3190 type_name->specs->attrs = NULL_TREE;
3192 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
3195 /* Apply attributes. */
3196 decl_attributes (&type, attrs, 0);
3201 /* Decode a declarator in an ordinary declaration or data definition.
3202 This is called as soon as the type information and variable name
3203 have been parsed, before parsing the initializer if any.
3204 Here we create the ..._DECL node, fill in its type,
3205 and put it on the list of decls for the current context.
3206 The ..._DECL node is returned as the value.
3208 Exception: for arrays where the length is not specified,
3209 the type is left null, to be filled in by `finish_decl'.
3211 Function definitions do not come here; they go to start_function
3212 instead. However, external and forward declarations of functions
3213 do go through here. Structure field declarations are done by
3214 grokfield and not through here. */
3217 start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
3218 bool initialized, tree attributes)
3223 /* An object declared as __attribute__((deprecated)) suppresses
3224 warnings of uses of other deprecated items. */
3225 if (lookup_attribute ("deprecated", attributes))
3226 deprecated_state = DEPRECATED_SUPPRESS;
3228 decl = grokdeclarator (declarator, declspecs,
3229 NORMAL, initialized, NULL);
3233 deprecated_state = DEPRECATED_NORMAL;
3235 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3236 && MAIN_NAME_P (DECL_NAME (decl)))
3237 warning (OPT_Wmain, "%q+D is usually a function", decl);
3240 /* Is it valid for this decl to have an initializer at all?
3241 If not, set INITIALIZED to zero, which will indirectly
3242 tell 'finish_decl' to ignore the initializer once it is parsed. */
3243 switch (TREE_CODE (decl))
3246 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
3251 error ("function %qD is initialized like a variable", decl);
3256 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3257 error ("parameter %qD is initialized", decl);
3262 /* Don't allow initializations for incomplete types except for
3263 arrays which might be completed by the initialization. */
3265 /* This can happen if the array size is an undefined macro.
3266 We already gave a warning, so we don't need another one. */
3267 if (TREE_TYPE (decl) == error_mark_node)
3269 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3271 /* A complete type is ok if size is fixed. */
3273 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3274 || C_DECL_VARIABLE_SIZE (decl))
3276 error ("variable-sized object may not be initialized");
3280 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3282 error ("variable %qD has initializer but incomplete type", decl);
3285 else if (C_DECL_VARIABLE_SIZE (decl))
3287 /* Although C99 is unclear about whether incomplete arrays
3288 of VLAs themselves count as VLAs, it does not make
3289 sense to permit them to be initialized given that
3290 ordinary VLAs may not be initialized. */
3291 error ("variable-sized object may not be initialized");
3298 if (current_scope == file_scope)
3299 TREE_STATIC (decl) = 1;
3301 /* Tell 'pushdecl' this is an initialized decl
3302 even though we don't yet have the initializer expression.
3303 Also tell 'finish_decl' it may store the real initializer. */
3304 DECL_INITIAL (decl) = error_mark_node;
3307 /* If this is a function declaration, write a record describing it to the
3308 prototypes file (if requested). */
3310 if (TREE_CODE (decl) == FUNCTION_DECL)
3311 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3313 /* ANSI specifies that a tentative definition which is not merged with
3314 a non-tentative definition behaves exactly like a definition with an
3315 initializer equal to zero. (Section 3.7.2)
3317 -fno-common gives strict ANSI behavior, though this tends to break
3318 a large body of code that grew up without this rule.
3320 Thread-local variables are never common, since there's no entrenched
3321 body of code to break, and it allows more efficient variable references
3322 in the presence of dynamic linking. */
3324 if (TREE_CODE (decl) == VAR_DECL
3326 && TREE_PUBLIC (decl)
3327 && !DECL_THREAD_LOCAL_P (decl)
3329 DECL_COMMON (decl) = 1;
3331 /* Set attributes here so if duplicate decl, will have proper attributes. */
3332 decl_attributes (&decl, attributes, 0);
3334 /* Handle gnu_inline attribute. */
3335 if (declspecs->inline_p
3336 && !flag_gnu89_inline
3337 && TREE_CODE (decl) == FUNCTION_DECL
3338 && lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl)))
3340 if (declspecs->storage_class == csc_auto && current_scope != file_scope)
3342 else if (declspecs->storage_class != csc_static)
3343 DECL_EXTERNAL (decl) = !DECL_EXTERNAL (decl);
3346 if (TREE_CODE (decl) == FUNCTION_DECL
3347 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
3349 struct c_declarator *ce = declarator;
3351 if (ce->kind == cdk_pointer)
3352 ce = declarator->declarator;
3353 if (ce->kind == cdk_function)
3355 tree args = ce->u.arg_info->parms;
3356 for (; args; args = TREE_CHAIN (args))
3358 tree type = TREE_TYPE (args);
3359 if (type && INTEGRAL_TYPE_P (type)
3360 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
3361 DECL_ARG_TYPE (args) = integer_type_node;
3366 if (TREE_CODE (decl) == FUNCTION_DECL
3367 && DECL_DECLARED_INLINE_P (decl)
3368 && DECL_UNINLINABLE (decl)
3369 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3370 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
3373 /* C99 6.7.4p3: An inline definition of a function with external
3374 linkage shall not contain a definition of a modifiable object
3375 with static storage duration... */
3376 if (TREE_CODE (decl) == VAR_DECL
3377 && current_scope != file_scope
3378 && TREE_STATIC (decl)
3379 && !TREE_READONLY (decl)
3380 && DECL_DECLARED_INLINE_P (current_function_decl)
3381 && DECL_EXTERNAL (current_function_decl))
3382 pedwarn ("%q+D is static but declared in inline function %qD "
3383 "which is not static", decl, current_function_decl);
3385 /* Add this decl to the current scope.
3386 TEM may equal DECL or it may be a previous decl of the same name. */
3387 tem = pushdecl (decl);
3389 if (initialized && DECL_EXTERNAL (tem))
3391 DECL_EXTERNAL (tem) = 0;
3392 TREE_STATIC (tem) = 1;
3398 /* Initialize EH if not initialized yet and exceptions are enabled. */
3401 c_maybe_initialize_eh (void)
3403 if (!flag_exceptions || c_eh_initialized_p)
3406 c_eh_initialized_p = true;
3407 eh_personality_libfunc
3408 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3409 ? "__gcc_personality_sj0"
3410 : "__gcc_personality_v0");
3411 default_init_unwind_resume_libfunc ();
3412 using_eh_for_cleanups ();
3415 /* Finish processing of a declaration;
3416 install its initial value.
3417 If the length of an array type is not known before,
3418 it must be determined now, from the initial value, or it is an error. */
3421 finish_decl (tree decl, tree init, tree asmspec_tree)
3424 int was_incomplete = (DECL_SIZE (decl) == 0);
3425 const char *asmspec = 0;
3427 /* If a name was specified, get the string. */
3428 if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
3429 && DECL_FILE_SCOPE_P (decl))
3430 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
3432 asmspec = TREE_STRING_POINTER (asmspec_tree);
3434 /* If `start_decl' didn't like having an initialization, ignore it now. */
3435 if (init != 0 && DECL_INITIAL (decl) == 0)
3438 /* Don't crash if parm is initialized. */
3439 if (TREE_CODE (decl) == PARM_DECL)
3443 store_init_value (decl, init);
3445 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
3446 || TREE_CODE (decl) == FUNCTION_DECL
3447 || TREE_CODE (decl) == FIELD_DECL))
3448 objc_check_decl (decl);
3450 type = TREE_TYPE (decl);
3452 /* Deduce size of array from initialization, if not already known. */
3453 if (TREE_CODE (type) == ARRAY_TYPE
3454 && TYPE_DOMAIN (type) == 0
3455 && TREE_CODE (decl) != TYPE_DECL)
3458 = (TREE_STATIC (decl)
3459 /* Even if pedantic, an external linkage array
3460 may have incomplete type at first. */
3461 ? pedantic && !TREE_PUBLIC (decl)
3462 : !DECL_EXTERNAL (decl));
3464 = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl),
3467 /* Get the completed type made by complete_array_type. */
3468 type = TREE_TYPE (decl);
3473 error ("initializer fails to determine size of %q+D", decl);
3478 error ("array size missing in %q+D", decl);
3479 /* If a `static' var's size isn't known,
3480 make it extern as well as static, so it does not get
3482 If it is not `static', then do not mark extern;
3483 finish_incomplete_decl will give it a default size
3484 and it will get allocated. */
3485 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
3486 DECL_EXTERNAL (decl) = 1;
3490 error ("zero or negative size array %q+D", decl);
3494 /* For global variables, update the copy of the type that
3495 exists in the binding. */
3496 if (TREE_PUBLIC (decl))
3498 struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl));
3499 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
3500 b_ext = b_ext->shadowed;
3504 b_ext->type = composite_type (b_ext->type, type);
3515 if (DECL_INITIAL (decl))
3516 TREE_TYPE (DECL_INITIAL (decl)) = type;
3518 layout_decl (decl, 0);
3521 if (TREE_CODE (decl) == VAR_DECL)
3523 if (init && TREE_CODE (init) == CONSTRUCTOR)
3524 add_flexible_array_elts_to_size (decl, init);
3526 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3527 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3528 layout_decl (decl, 0);
3530 if (DECL_SIZE (decl) == 0
3531 /* Don't give an error if we already gave one earlier. */
3532 && TREE_TYPE (decl) != error_mark_node
3533 && (TREE_STATIC (decl)
3534 /* A static variable with an incomplete type
3535 is an error if it is initialized.
3536 Also if it is not file scope.
3537 Otherwise, let it through, but if it is not `extern'
3538 then it may cause an error message later. */
3539 ? (DECL_INITIAL (decl) != 0
3540 || !DECL_FILE_SCOPE_P (decl))
3541 /* An automatic variable with an incomplete type
3543 : !DECL_EXTERNAL (decl)))
3545 error ("storage size of %q+D isn%'t known", decl);
3546 TREE_TYPE (decl) = error_mark_node;
3549 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3550 && DECL_SIZE (decl) != 0)
3552 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3553 constant_expression_warning (DECL_SIZE (decl));
3555 error ("storage size of %q+D isn%'t constant", decl);
3558 if (TREE_USED (type))
3559 TREE_USED (decl) = 1;
3562 /* If this is a function and an assembler name is specified, reset DECL_RTL
3563 so we can give it its new name. Also, update built_in_decls if it
3564 was a normal built-in. */
3565 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3567 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
3568 set_builtin_user_assembler_name (decl, asmspec);
3569 set_user_assembler_name (decl, asmspec);
3572 /* If #pragma weak was used, mark the decl weak now. */
3573 maybe_apply_pragma_weak (decl);
3575 /* Output the assembler code and/or RTL code for variables and functions,
3576 unless the type is an undefined structure or union.
3577 If not, it will get done when the type is completed. */
3579 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3581 /* Determine the ELF visibility. */
3582 if (TREE_PUBLIC (decl))
3583 c_determine_visibility (decl);
3585 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3586 if (c_dialect_objc ())
3587 objc_check_decl (decl);
3591 /* If this is not a static variable, issue a warning.
3592 It doesn't make any sense to give an ASMSPEC for an
3593 ordinary, non-register local variable. Historically,
3594 GCC has accepted -- but ignored -- the ASMSPEC in
3596 if (!DECL_FILE_SCOPE_P (decl)
3597 && TREE_CODE (decl) == VAR_DECL
3598 && !C_DECL_REGISTER (decl)
3599 && !TREE_STATIC (decl))
3600 warning (0, "ignoring asm-specifier for non-static local "
3601 "variable %q+D", decl);
3603 set_user_assembler_name (decl, asmspec);
3606 if (DECL_FILE_SCOPE_P (decl))
3608 if (DECL_INITIAL (decl) == NULL_TREE
3609 || DECL_INITIAL (decl) == error_mark_node)
3610 /* Don't output anything
3611 when a tentative file-scope definition is seen.
3612 But at end of compilation, do output code for them. */
3613 DECL_DEFER_OUTPUT (decl) = 1;
3614 rest_of_decl_compilation (decl, true, 0);
3618 /* In conjunction with an ASMSPEC, the `register'
3619 keyword indicates that we should place the variable
3620 in a particular register. */
3621 if (asmspec && C_DECL_REGISTER (decl))
3623 DECL_HARD_REGISTER (decl) = 1;
3624 /* This cannot be done for a structure with volatile
3625 fields, on which DECL_REGISTER will have been
3627 if (!DECL_REGISTER (decl))
3628 error ("cannot put object with volatile field into register");
3631 if (TREE_CODE (decl) != FUNCTION_DECL)
3633 /* If we're building a variable sized type, and we might be
3634 reachable other than via the top of the current binding
3635 level, then create a new BIND_EXPR so that we deallocate
3636 the object at the right time. */
3637 /* Note that DECL_SIZE can be null due to errors. */
3638 if (DECL_SIZE (decl)
3639 && !TREE_CONSTANT (DECL_SIZE (decl))
3640 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
3643 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
3644 TREE_SIDE_EFFECTS (bind) = 1;
3646 BIND_EXPR_BODY (bind) = push_stmt_list ();
3648 add_stmt (build_stmt (DECL_EXPR, decl));
3653 if (!DECL_FILE_SCOPE_P (decl))
3655 /* Recompute the RTL of a local array now
3656 if it used to be an incomplete type. */
3658 && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
3660 /* If we used it already as memory, it must stay in memory. */
3661 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3662 /* If it's still incomplete now, no init will save it. */
3663 if (DECL_SIZE (decl) == 0)
3664 DECL_INITIAL (decl) = 0;
3669 /* If this was marked 'used', be sure it will be output. */
3670 if (!flag_unit_at_a_time && lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
3671 mark_decl_referenced (decl);
3673 if (TREE_CODE (decl) == TYPE_DECL)
3675 if (!DECL_FILE_SCOPE_P (decl)
3676 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3677 add_stmt (build_stmt (DECL_EXPR, decl));
3679 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
3682 /* At the end of a declaration, throw away any variable type sizes
3683 of types defined inside that declaration. There is no use
3684 computing them in the following function definition. */
3685 if (current_scope == file_scope)
3686 get_pending_sizes ();
3688 /* Install a cleanup (aka destructor) if one was given. */
3689 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
3691 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
3694 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
3695 tree cleanup_decl = lookup_name (cleanup_id);
3698 /* Build "cleanup(&decl)" for the destructor. */
3699 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
3700 cleanup = build_tree_list (NULL_TREE, cleanup);
3701 cleanup = build_function_call (cleanup_decl, cleanup);
3703 /* Don't warn about decl unused; the cleanup uses it. */
3704 TREE_USED (decl) = 1;
3705 TREE_USED (cleanup_decl) = 1;
3707 /* Initialize EH, if we've been told to do so. */
3708 c_maybe_initialize_eh ();
3710 push_cleanup (decl, cleanup, false);
3715 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
3718 grokparm (const struct c_parm *parm)
3720 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
3723 decl_attributes (&decl, parm->attrs, 0);
3728 /* Given a parsed parameter declaration, decode it into a PARM_DECL
3729 and push that on the current scope. */
3732 push_parm_decl (const struct c_parm *parm)
3736 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL);
3737 decl_attributes (&decl, parm->attrs, 0);
3739 decl = pushdecl (decl);
3741 finish_decl (decl, NULL_TREE, NULL_TREE);
3744 /* Mark all the parameter declarations to date as forward decls.
3745 Also diagnose use of this extension. */
3748 mark_forward_parm_decls (void)
3750 struct c_binding *b;
3752 if (pedantic && !current_scope->warned_forward_parm_decls)
3754 pedwarn ("ISO C forbids forward parameter declarations");
3755 current_scope->warned_forward_parm_decls = true;
3758 for (b = current_scope->bindings; b; b = b->prev)
3759 if (TREE_CODE (b->decl) == PARM_DECL)
3760 TREE_ASM_WRITTEN (b->decl) = 1;
3763 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3764 literal, which may be an incomplete array type completed by the
3765 initializer; INIT is a CONSTRUCTOR that initializes the compound
3769 build_compound_literal (tree type, tree init)
3771 /* We do not use start_decl here because we have a type, not a declarator;
3772 and do not use finish_decl because the decl should be stored inside
3773 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
3778 if (type == error_mark_node)
3779 return error_mark_node;
3781 decl = build_decl (VAR_DECL, NULL_TREE, type);
3782 DECL_EXTERNAL (decl) = 0;
3783 TREE_PUBLIC (decl) = 0;
3784 TREE_STATIC (decl) = (current_scope == file_scope);
3785 DECL_CONTEXT (decl) = current_function_decl;
3786 TREE_USED (decl) = 1;
3787 TREE_TYPE (decl) = type;
3788 TREE_READONLY (decl) = TYPE_READONLY (type);
3789 store_init_value (decl, init);
3791 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3793 int failure = complete_array_type (&TREE_TYPE (decl),
3794 DECL_INITIAL (decl), true);
3795 gcc_assert (!failure);
3797 type = TREE_TYPE (decl);
3798 TREE_TYPE (DECL_INITIAL (decl)) = type;
3801 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3802 return error_mark_node;
3804 stmt = build_stmt (DECL_EXPR, decl);
3805 complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt);
3806 TREE_SIDE_EFFECTS (complit) = 1;
3808 layout_decl (decl, 0);
3810 if (TREE_STATIC (decl))
3812 /* This decl needs a name for the assembler output. */
3813 set_compound_literal_name (decl);
3814 DECL_DEFER_OUTPUT (decl) = 1;
3815 DECL_COMDAT (decl) = 1;
3816 DECL_ARTIFICIAL (decl) = 1;
3817 DECL_IGNORED_P (decl) = 1;
3819 rest_of_decl_compilation (decl, 1, 0);
3825 /* Determine whether TYPE is a structure with a flexible array member,
3826 or a union containing such a structure (possibly recursively). */
3829 flexible_array_type_p (tree type)
3832 switch (TREE_CODE (type))
3835 x = TYPE_FIELDS (type);
3838 while (TREE_CHAIN (x) != NULL_TREE)
3840 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3841 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3842 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3843 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3847 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3849 if (flexible_array_type_p (TREE_TYPE (x)))
3858 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3859 replacing with appropriate values if they are invalid. */
3861 check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
3864 unsigned int max_width;
3865 unsigned HOST_WIDE_INT w;
3866 const char *name = orig_name ? orig_name: _("<anonymous>");
3868 /* Detect and ignore out of range field width and process valid
3870 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width))
3871 || TREE_CODE (*width) != INTEGER_CST)
3873 error ("bit-field %qs width not an integer constant", name);
3874 *width = integer_one_node;
3878 constant_expression_warning (*width);
3879 if (tree_int_cst_sgn (*width) < 0)
3881 error ("negative width in bit-field %qs", name);
3882 *width = integer_one_node;
3884 else if (integer_zerop (*width) && orig_name)
3886 error ("zero width for bit-field %qs", name);
3887 *width = integer_one_node;
3891 /* Detect invalid bit-field type. */
3892 if (TREE_CODE (*type) != INTEGER_TYPE
3893 && TREE_CODE (*type) != BOOLEAN_TYPE
3894 && TREE_CODE (*type) != ENUMERAL_TYPE)
3896 error ("bit-field %qs has invalid type", name);
3897 *type = unsigned_type_node;
3900 type_mv = TYPE_MAIN_VARIANT (*type);
3902 && !in_system_header
3903 && type_mv != integer_type_node
3904 && type_mv != unsigned_type_node
3905 && type_mv != boolean_type_node)
3906 pedwarn ("type of bit-field %qs is a GCC extension", name);
3908 if (type_mv == boolean_type_node)
3909 max_width = CHAR_TYPE_SIZE;
3911 max_width = TYPE_PRECISION (*type);
3913 if (0 < compare_tree_int (*width, max_width))
3915 error ("width of %qs exceeds its type", name);
3917 *width = build_int_cst (NULL_TREE, w);
3920 w = tree_low_cst (*width, 1);
3922 if (TREE_CODE (*type) == ENUMERAL_TYPE)
3924 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
3926 || w < min_precision (lt->enum_min, TYPE_UNSIGNED (*type))
3927 || w < min_precision (lt->enum_max, TYPE_UNSIGNED (*type)))
3928 warning (0, "%qs is narrower than values of its type", name);
3934 /* Print warning about variable length array if necessary. */
3937 warn_variable_length_array (const char *name, tree size)
3939 int ped = !flag_isoc99 && pedantic && warn_vla != 0;
3940 int const_size = TREE_CONSTANT (size);
3947 pedwarn ("ISO C90 forbids array %qs whose size "
3948 "can%'t be evaluated",
3951 pedwarn ("ISO C90 forbids array whose size "
3952 "can%'t be evaluated");
3957 pedwarn ("ISO C90 forbids variable length array %qs",
3960 pedwarn ("ISO C90 forbids variable length array");
3963 else if (warn_vla > 0)
3969 "the size of array %qs can"
3970 "%'t be evaluated", name);
3973 "the size of array can %'t be evaluated");
3979 "variable length array %qs is used",
3983 "variable length array is used");
3988 /* Given declspecs and a declarator,
3989 determine the name and type of the object declared
3990 and construct a ..._DECL node for it.
3991 (In one case we can return a ..._TYPE node instead.
3992 For invalid input we sometimes return 0.)
3994 DECLSPECS is a c_declspecs structure for the declaration specifiers.
3996 DECL_CONTEXT says which syntactic context this declaration is in:
3997 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3998 FUNCDEF for a function definition. Like NORMAL but a few different
3999 error messages in each case. Return value may be zero meaning
4000 this definition is too screwy to try to parse.
4001 PARM for a parameter declaration (either within a function prototype
4002 or before a function body). Make a PARM_DECL, or return void_type_node.
4003 TYPENAME if for a typename (in a cast or sizeof).
4004 Don't make a DECL node; just return the ..._TYPE node.
4005 FIELD for a struct or union field; make a FIELD_DECL.
4006 INITIALIZED is true if the decl has an initializer.
4007 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
4008 representing the width of the bit-field.
4010 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4011 It may also be so in the PARM case, for a prototype where the
4012 argument type is specified but not the name.
4014 This function is where the complicated C meanings of `static'
4015 and `extern' are interpreted. */
4018 grokdeclarator (const struct c_declarator *declarator,
4019 struct c_declspecs *declspecs,
4020 enum decl_context decl_context, bool initialized, tree *width)
4022 tree type = declspecs->type;
4023 bool threadp = declspecs->thread_p;
4024 enum c_storage_class storage_class = declspecs->storage_class;
4028 int type_quals = TYPE_UNQUALIFIED;
4029 const char *name, *orig_name;
4030 tree typedef_type = 0;
4031 bool funcdef_flag = false;
4032 bool funcdef_syntax = false;
4033 int size_varies = 0;
4034 tree decl_attr = declspecs->decl_attr;
4035 int array_ptr_quals = TYPE_UNQUALIFIED;
4036 tree array_ptr_attrs = NULL_TREE;
4037 int array_parm_static = 0;
4038 bool array_parm_vla_unspec_p = false;
4039 tree returned_attrs = NULL_TREE;
4040 bool bitfield = width != NULL;
4042 struct c_arg_info *arg_info = 0;
4044 if (decl_context == FUNCDEF)
4045 funcdef_flag = true, decl_context = NORMAL;
4047 /* Look inside a declarator for the name being declared
4048 and get it as a string, for an error message. */
4050 const struct c_declarator *decl = declarator;
4059 funcdef_syntax = (decl->kind == cdk_function);
4060 decl = decl->declarator;
4064 decl = decl->declarator;
4069 name = IDENTIFIER_POINTER (decl->u.id);
4081 /* A function definition's declarator must have the form of
4082 a function declarator. */
4084 if (funcdef_flag && !funcdef_syntax)
4087 /* If this looks like a function definition, make it one,
4088 even if it occurs where parms are expected.
4089 Then store_parm_decls will reject it and not use it as a parm. */
4090 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
4091 decl_context = PARM;
4093 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
4094 warn_deprecated_use (declspecs->type);
4096 if ((decl_context == NORMAL || decl_context == FIELD)
4097 && current_scope == file_scope
4098 && variably_modified_type_p (type, NULL_TREE))
4100 error ("variably modified %qs at file scope", name);
4101 type = integer_type_node;
4104 typedef_type = type;
4105 size_varies = C_TYPE_VARIABLE_SIZE (type);
4107 /* Diagnose defaulting to "int". */
4109 if (declspecs->default_int_p && !in_system_header)
4111 /* Issue a warning if this is an ISO C 99 program or if
4112 -Wreturn-type and this is a function, or if -Wimplicit;
4113 prefer the former warning since it is more explicit. */
4114 if ((warn_implicit_int || warn_return_type || flag_isoc99)
4116 warn_about_return_type = 1;
4117 else if (warn_implicit_int || flag_isoc99)
4118 pedwarn_c99 ("type defaults to %<int%> in declaration of %qs", name);
4121 /* Adjust the type if a bit-field is being declared,
4122 -funsigned-bitfields applied and the type is not explicitly
4124 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
4125 && TREE_CODE (type) == INTEGER_TYPE)
4126 type = c_common_unsigned_type (type);
4128 /* Figure out the type qualifiers for the declaration. There are
4129 two ways a declaration can become qualified. One is something
4130 like `const int i' where the `const' is explicit. Another is
4131 something like `typedef const int CI; CI i' where the type of the
4132 declaration contains the `const'. A third possibility is that
4133 there is a type qualifier on the element type of a typedefed
4134 array type, in which case we should extract that qualifier so
4135 that c_apply_type_quals_to_decls receives the full list of
4136 qualifiers to work with (C90 is not entirely clear about whether
4137 duplicate qualifiers should be diagnosed in this case, but it
4138 seems most appropriate to do so). */
4139 element_type = strip_array_types (type);
4140 constp = declspecs->const_p + TYPE_READONLY (element_type);
4141 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
4142 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
4143 if (pedantic && !flag_isoc99)
4146 pedwarn ("duplicate %<const%>");
4148 pedwarn ("duplicate %<restrict%>");
4150 pedwarn ("duplicate %<volatile%>");
4152 if (!flag_gen_aux_info && (TYPE_QUALS (element_type)))
4153 type = TYPE_MAIN_VARIANT (type);
4154 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4155 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4156 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4158 /* Warn about storage classes that are invalid for certain
4159 kinds of declarations (parameters, typenames, etc.). */
4163 || storage_class == csc_auto
4164 || storage_class == csc_register
4165 || storage_class == csc_typedef))
4167 if (storage_class == csc_auto
4168 && (pedantic || current_scope == file_scope))
4169 pedwarn ("function definition declared %<auto%>");
4170 if (storage_class == csc_register)
4171 error ("function definition declared %<register%>");
4172 if (storage_class == csc_typedef)
4173 error ("function definition declared %<typedef%>");
4175 error ("function definition declared %<__thread%>");
4177 if (storage_class == csc_auto
4178 || storage_class == csc_register
4179 || storage_class == csc_typedef)
4180 storage_class = csc_none;
4182 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
4184 if (decl_context == PARM && storage_class == csc_register)
4188 switch (decl_context)
4191 error ("storage class specified for structure field %qs",
4195 error ("storage class specified for parameter %qs", name);
4198 error ("storage class specified for typename");
4201 storage_class = csc_none;
4205 else if (storage_class == csc_extern
4209 /* 'extern' with initialization is invalid if not at file scope. */
4210 if (current_scope == file_scope)
4212 /* It is fine to have 'extern const' when compiling at C
4213 and C++ intersection. */
4214 if (!(warn_cxx_compat && constp))
4215 warning (0, "%qs initialized and declared %<extern%>", name);
4218 error ("%qs has both %<extern%> and initializer", name);
4220 else if (current_scope == file_scope)
4222 if (storage_class == csc_auto)
4223 error ("file-scope declaration of %qs specifies %<auto%>", name);
4224 if (pedantic && storage_class == csc_register)
4225 pedwarn ("file-scope declaration of %qs specifies %<register%>", name);
4229 if (storage_class == csc_extern && funcdef_flag)
4230 error ("nested function %qs declared %<extern%>", name);
4231 else if (threadp && storage_class == csc_none)
4233 error ("function-scope %qs implicitly auto and declared "
4240 /* Now figure out the structure of the declarator proper.
4241 Descend through it, creating more complex types, until we reach
4242 the declared identifier (or NULL_TREE, in an absolute declarator).
4243 At each stage we maintain an unqualified version of the type
4244 together with any qualifiers that should be applied to it with
4245 c_build_qualified_type; this way, array types including
4246 multidimensional array types are first built up in unqualified
4247 form and then the qualified form is created with
4248 TYPE_MAIN_VARIANT pointing to the unqualified form. */
4250 while (declarator && declarator->kind != cdk_id)
4252 if (type == error_mark_node)
4254 declarator = declarator->declarator;
4258 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
4259 a cdk_pointer (for *...),
4260 a cdk_function (for ...(...)),
4261 a cdk_attrs (for nested attributes),
4262 or a cdk_id (for the name being declared
4263 or the place in an absolute declarator
4264 where the name was omitted).
4265 For the last case, we have just exited the loop.
4267 At this point, TYPE is the type of elements of an array,
4268 or for a function to return, or for a pointer to point to.
4269 After this sequence of ifs, TYPE is the type of the
4270 array or function or pointer, and DECLARATOR has had its
4271 outermost layer removed. */
4273 if (array_ptr_quals != TYPE_UNQUALIFIED
4274 || array_ptr_attrs != NULL_TREE
4275 || array_parm_static)
4277 /* Only the innermost declarator (making a parameter be of
4278 array type which is converted to pointer type)
4279 may have static or type qualifiers. */
4280 error ("static or type qualifiers in non-parameter array declarator");
4281 array_ptr_quals = TYPE_UNQUALIFIED;
4282 array_ptr_attrs = NULL_TREE;
4283 array_parm_static = 0;
4286 switch (declarator->kind)
4290 /* A declarator with embedded attributes. */
4291 tree attrs = declarator->u.attrs;
4292 const struct c_declarator *inner_decl;
4294 declarator = declarator->declarator;
4295 inner_decl = declarator;
4296 while (inner_decl->kind == cdk_attrs)
4297 inner_decl = inner_decl->declarator;
4298 if (inner_decl->kind == cdk_id)
4299 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4300 else if (inner_decl->kind == cdk_function)
4301 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4302 else if (inner_decl->kind == cdk_array)
4303 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4304 returned_attrs = decl_attributes (&type,
4305 chainon (returned_attrs, attrs),
4311 tree itype = NULL_TREE;
4312 tree size = declarator->u.array.dimen;
4313 /* The index is a signed object `sizetype' bits wide. */
4314 tree index_type = c_common_signed_type (sizetype);
4316 array_ptr_quals = declarator->u.array.quals;
4317 array_ptr_attrs = declarator->u.array.attrs;
4318 array_parm_static = declarator->u.array.static_p;
4319 array_parm_vla_unspec_p = declarator->u.array.vla_unspec_p;
4321 declarator = declarator->declarator;
4323 /* Check for some types that there cannot be arrays of. */
4325 if (VOID_TYPE_P (type))
4327 error ("declaration of %qs as array of voids", name);
4328 type = error_mark_node;
4331 if (TREE_CODE (type) == FUNCTION_TYPE)
4333 error ("declaration of %qs as array of functions", name);
4334 type = error_mark_node;
4337 if (pedantic && !in_system_header && flexible_array_type_p (type))
4338 pedwarn ("invalid use of structure with flexible array member");
4340 if (size == error_mark_node)
4341 type = error_mark_node;
4343 if (type == error_mark_node)
4346 /* If size was specified, set ITYPE to a range-type for
4347 that size. Otherwise, ITYPE remains null. finish_decl
4348 may figure it out from an initial value. */
4352 /* Strip NON_LVALUE_EXPRs since we aren't using as an
4354 STRIP_TYPE_NOPS (size);
4356 if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
4358 error ("size of array %qs has non-integer type", name);
4359 size = integer_one_node;
4362 if (pedantic && integer_zerop (size))
4363 pedwarn ("ISO C forbids zero-size array %qs", name);
4365 if (TREE_CODE (size) == INTEGER_CST)
4367 constant_expression_warning (size);
4368 if (tree_int_cst_sgn (size) < 0)
4370 error ("size of array %qs is negative", name);
4371 size = integer_one_node;
4374 else if ((decl_context == NORMAL || decl_context == FIELD)
4375 && current_scope == file_scope)
4377 error ("variably modified %qs at file scope", name);
4378 size = integer_one_node;
4382 /* Make sure the array size remains visibly
4383 nonconstant even if it is (eg) a const variable
4384 with known value. */
4386 warn_variable_length_array (orig_name, size);
4387 if (warn_variable_decl)
4388 warning (0, "variable-sized array %qs", name);
4391 if (integer_zerop (size))
4393 /* A zero-length array cannot be represented with
4394 an unsigned index type, which is what we'll
4395 get with build_index_type. Create an
4396 open-ended range instead. */
4397 itype = build_range_type (sizetype, size, NULL_TREE);
4401 /* Arrange for the SAVE_EXPR on the inside of the
4402 MINUS_EXPR, which allows the -1 to get folded
4403 with the +1 that happens when building TYPE_SIZE. */
4405 size = variable_size (size);
4407 /* Compute the maximum valid index, that is, size
4408 - 1. Do the calculation in index_type, so that
4409 if it is a variable the computations will be
4410 done in the proper mode. */
4411 itype = fold_build2 (MINUS_EXPR, index_type,
4412 convert (index_type, size),
4413 convert (index_type,
4416 /* If that overflowed, the array is too big. ???
4417 While a size of INT_MAX+1 technically shouldn't
4418 cause an overflow (because we subtract 1), the
4419 overflow is recorded during the conversion to
4420 index_type, before the subtraction. Handling
4421 this case seems like an unnecessary
4423 if (TREE_CODE (itype) == INTEGER_CST
4424 && TREE_OVERFLOW (itype))
4426 error ("size of array %qs is too large", name);
4427 type = error_mark_node;
4431 itype = build_index_type (itype);
4434 else if (decl_context == FIELD)
4436 if (pedantic && !flag_isoc99 && !in_system_header)
4437 pedwarn ("ISO C90 does not support flexible array members");
4439 /* ISO C99 Flexible array members are effectively
4440 identical to GCC's zero-length array extension. */
4441 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4443 else if (decl_context == PARM)
4445 if (array_parm_vla_unspec_p)
4450 error ("%<[*]%> not allowed in other than a declaration");
4453 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4457 else if (decl_context == TYPENAME)
4459 if (array_parm_vla_unspec_p)
4461 /* The error is printed elsewhere. We use this to
4462 avoid messing up with incomplete array types of
4463 the same type, that would otherwise be modified
4465 itype = build_range_type (sizetype, size_zero_node,
4470 /* Complain about arrays of incomplete types. */
4471 if (!COMPLETE_TYPE_P (type))
4473 error ("array type has incomplete element type");
4474 type = error_mark_node;
4477 /* When itype is NULL, a shared incomplete array type is
4478 returned for all array of a given type. Elsewhere we
4479 make sure we don't complete that type before copying
4480 it, but here we want to make sure we don't ever
4481 modify the shared type, so we gcc_assert (itype)
4483 type = build_array_type (type, itype);
4485 if (type != error_mark_node)
4489 /* It is ok to modify type here even if itype is
4490 NULL: if size_varies, we're in a
4491 multi-dimensional array and the inner type has
4492 variable size, so the enclosing shared array type
4494 if (size && TREE_CODE (size) == INTEGER_CST)
4496 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
4497 C_TYPE_VARIABLE_SIZE (type) = 1;
4500 /* The GCC extension for zero-length arrays differs from
4501 ISO flexible array members in that sizeof yields
4503 if (size && integer_zerop (size))
4506 TYPE_SIZE (type) = bitsize_zero_node;
4507 TYPE_SIZE_UNIT (type) = size_zero_node;
4509 if (array_parm_vla_unspec_p)
4512 /* The type is complete. C99 6.7.5.2p4 */
4513 TYPE_SIZE (type) = bitsize_zero_node;
4514 TYPE_SIZE_UNIT (type) = size_zero_node;
4518 if (decl_context != PARM
4519 && (array_ptr_quals != TYPE_UNQUALIFIED
4520 || array_ptr_attrs != NULL_TREE
4521 || array_parm_static))
4523 error ("static or type qualifiers in non-parameter array declarator");
4524 array_ptr_quals = TYPE_UNQUALIFIED;
4525 array_ptr_attrs = NULL_TREE;
4526 array_parm_static = 0;
4532 /* Say it's a definition only for the declarator closest
4533 to the identifier, apart possibly from some
4535 bool really_funcdef = false;
4539 const struct c_declarator *t = declarator->declarator;
4540 while (t->kind == cdk_attrs)
4542 really_funcdef = (t->kind == cdk_id);
4545 /* Declaring a function type. Make sure we have a valid
4546 type for the function to return. */
4547 if (type == error_mark_node)
4552 /* Warn about some types functions can't return. */
4553 if (TREE_CODE (type) == FUNCTION_TYPE)
4555 error ("%qs declared as function returning a function", name);
4556 type = integer_type_node;
4558 if (TREE_CODE (type) == ARRAY_TYPE)
4560 error ("%qs declared as function returning an array", name);
4561 type = integer_type_node;
4564 /* Construct the function type and go to the next
4565 inner layer of declarator. */
4566 arg_info = declarator->u.arg_info;
4567 arg_types = grokparms (arg_info, really_funcdef);
4569 put_pending_sizes (arg_info->pending_sizes);
4571 /* Type qualifiers before the return type of the function
4572 qualify the return type, not the function type. */
4575 /* Type qualifiers on a function return type are
4576 normally permitted by the standard but have no
4577 effect, so give a warning at -Wreturn-type.
4578 Qualifiers on a void return type are banned on
4579 function definitions in ISO C; GCC used to used
4580 them for noreturn functions. */
4581 if (VOID_TYPE_P (type) && really_funcdef)
4582 pedwarn ("function definition has qualified void return type");
4584 warning (OPT_Wreturn_type,
4585 "type qualifiers ignored on function return type");
4587 type = c_build_qualified_type (type, type_quals);
4589 type_quals = TYPE_UNQUALIFIED;
4591 type = build_function_type (type, arg_types);
4592 declarator = declarator->declarator;
4594 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4595 the formal parameter list of this FUNCTION_TYPE to point to
4596 the FUNCTION_TYPE node itself. */
4600 for (link = arg_info->tags;
4602 link = TREE_CHAIN (link))
4603 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4609 /* Merge any constancy or volatility into the target type
4612 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4614 pedwarn ("ISO C forbids qualified function types");
4616 type = c_build_qualified_type (type, type_quals);
4619 /* When the pointed-to type involves components of variable size,
4620 care must be taken to ensure that the size evaluation code is
4621 emitted early enough to dominate all the possible later uses
4622 and late enough for the variables on which it depends to have
4625 This is expected to happen automatically when the pointed-to
4626 type has a name/declaration of it's own, but special attention
4627 is required if the type is anonymous.
4629 We handle the NORMAL and FIELD contexts here by attaching an
4630 artificial TYPE_DECL to such pointed-to type. This forces the
4631 sizes evaluation at a safe point and ensures it is not deferred
4632 until e.g. within a deeper conditional context.
4634 We expect nothing to be needed here for PARM or TYPENAME.
4635 Pushing a TYPE_DECL at this point for TYPENAME would actually
4636 be incorrect, as we might be in the middle of an expression
4637 with side effects on the pointed-to type size "arguments" prior
4638 to the pointer declaration point and the fake TYPE_DECL in the
4639 enclosing context would force the size evaluation prior to the
4642 if (!TYPE_NAME (type)
4643 && (decl_context == NORMAL || decl_context == FIELD)
4644 && variably_modified_type_p (type, NULL_TREE))
4646 tree decl = build_decl (TYPE_DECL, NULL_TREE, type);
4647 DECL_ARTIFICIAL (decl) = 1;
4649 finish_decl (decl, NULL_TREE, NULL_TREE);
4650 TYPE_NAME (type) = decl;
4653 type = build_pointer_type (type);
4655 /* Process type qualifiers (such as const or volatile)
4656 that were given inside the `*'. */
4657 type_quals = declarator->u.pointer_quals;
4659 declarator = declarator->declarator;
4667 /* Now TYPE has the actual type, apart from any qualifiers in
4670 /* Check the type and width of a bit-field. */
4672 check_bitfield_type_and_width (&type, width, orig_name);
4674 /* Did array size calculations overflow? */
4676 if (TREE_CODE (type) == ARRAY_TYPE
4677 && COMPLETE_TYPE_P (type)
4678 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
4679 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
4681 error ("size of array %qs is too large", name);
4682 /* If we proceed with the array type as it is, we'll eventually
4683 crash in tree_low_cst(). */
4684 type = error_mark_node;
4687 /* If this is declaring a typedef name, return a TYPE_DECL. */
4689 if (storage_class == csc_typedef)
4692 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4694 pedwarn ("ISO C forbids qualified function types");
4696 type = c_build_qualified_type (type, type_quals);
4697 decl = build_decl (TYPE_DECL, declarator->u.id, type);
4698 if (declspecs->explicit_signed_p)
4699 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4700 decl_attributes (&decl, returned_attrs, 0);
4701 if (declspecs->inline_p)
4702 pedwarn ("typedef %q+D declared %<inline%>", decl);
4706 /* If this is a type name (such as, in a cast or sizeof),
4707 compute the type and return it now. */
4709 if (decl_context == TYPENAME)
4711 /* Note that the grammar rejects storage classes in typenames
4713 gcc_assert (storage_class == csc_none && !threadp
4714 && !declspecs->inline_p);
4715 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4717 pedwarn ("ISO C forbids const or volatile function types");
4719 type = c_build_qualified_type (type, type_quals);
4720 decl_attributes (&type, returned_attrs, 0);
4724 if (pedantic && decl_context == FIELD
4725 && variably_modified_type_p (type, NULL_TREE))
4728 pedwarn ("a member of a structure or union cannot have a variably modified type");
4731 /* Aside from typedefs and type names (handle above),
4732 `void' at top level (not within pointer)
4733 is allowed only in public variables.
4734 We don't complain about parms either, but that is because
4735 a better error message can be made later. */
4737 if (VOID_TYPE_P (type) && decl_context != PARM
4738 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4739 && (storage_class == csc_extern
4740 || (current_scope == file_scope
4741 && !(storage_class == csc_static
4742 || storage_class == csc_register)))))
4744 error ("variable or field %qs declared void", name);
4745 type = integer_type_node;
4748 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4749 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4754 if (decl_context == PARM)
4756 tree type_as_written;
4759 /* A parameter declared as an array of T is really a pointer to T.
4760 One declared as a function is really a pointer to a function. */
4762 if (TREE_CODE (type) == ARRAY_TYPE)
4764 /* Transfer const-ness of array into that of type pointed to. */
4765 type = TREE_TYPE (type);
4767 type = c_build_qualified_type (type, type_quals);
4768 type = build_pointer_type (type);
4769 type_quals = array_ptr_quals;
4771 /* We don't yet implement attributes in this context. */
4772 if (array_ptr_attrs != NULL_TREE)
4773 warning (OPT_Wattributes,
4774 "attributes in parameter array declarator ignored");
4778 else if (TREE_CODE (type) == FUNCTION_TYPE)
4780 if (pedantic && type_quals)
4781 pedwarn ("ISO C forbids qualified function types");
4783 type = c_build_qualified_type (type, type_quals);
4784 type = build_pointer_type (type);
4785 type_quals = TYPE_UNQUALIFIED;
4787 else if (type_quals)
4788 type = c_build_qualified_type (type, type_quals);
4790 type_as_written = type;
4792 decl = build_decl (PARM_DECL, declarator->u.id, type);
4794 C_DECL_VARIABLE_SIZE (decl) = 1;
4796 /* Compute the type actually passed in the parmlist,
4797 for the case where there is no prototype.
4798 (For example, shorts and chars are passed as ints.)
4799 When there is a prototype, this is overridden later. */
4801 if (type == error_mark_node)
4802 promoted_type = type;
4804 promoted_type = c_type_promotes_to (type);
4806 DECL_ARG_TYPE (decl) = promoted_type;
4807 if (declspecs->inline_p)
4808 pedwarn ("parameter %q+D declared %<inline%>", decl);
4810 else if (decl_context == FIELD)
4812 /* Note that the grammar rejects storage classes in typenames
4814 gcc_assert (storage_class == csc_none && !threadp
4815 && !declspecs->inline_p);
4817 /* Structure field. It may not be a function. */
4819 if (TREE_CODE (type) == FUNCTION_TYPE)
4821 error ("field %qs declared as a function", name);
4822 type = build_pointer_type (type);
4824 else if (TREE_CODE (type) != ERROR_MARK
4825 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4827 error ("field %qs has incomplete type", name);
4828 type = error_mark_node;
4830 type = c_build_qualified_type (type, type_quals);
4831 decl = build_decl (FIELD_DECL, declarator->u.id, type);
4832 DECL_NONADDRESSABLE_P (decl) = bitfield;
4835 C_DECL_VARIABLE_SIZE (decl) = 1;
4837 else if (TREE_CODE (type) == FUNCTION_TYPE)
4839 if (storage_class == csc_register || threadp)
4841 error ("invalid storage class for function %qs", name);
4843 else if (current_scope != file_scope)
4845 /* Function declaration not at file scope. Storage
4846 classes other than `extern' are not allowed, C99
4847 6.7.1p5, and `extern' makes no difference. However,
4848 GCC allows 'auto', perhaps with 'inline', to support
4849 nested functions. */
4850 if (storage_class == csc_auto)
4853 pedwarn ("invalid storage class for function %qs", name);
4855 else if (storage_class == csc_static)
4857 error ("invalid storage class for function %qs", name);
4859 storage_class = declspecs->storage_class = csc_none;
4865 decl = build_decl (FUNCTION_DECL, declarator->u.id, type);
4866 decl = build_decl_attribute_variant (decl, decl_attr);
4868 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
4870 if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
4871 pedwarn ("ISO C forbids qualified function types");
4873 /* GNU C interprets a volatile-qualified function type to indicate
4874 that the function does not return. */
4875 if ((type_quals & TYPE_QUAL_VOLATILE)
4876 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4877 warning (0, "%<noreturn%> function returns non-void value");
4879 /* Every function declaration is an external reference
4880 (DECL_EXTERNAL) except for those which are not at file
4881 scope and are explicitly declared "auto". This is
4882 forbidden by standard C (C99 6.7.1p5) and is interpreted by
4883 GCC to signify a forward declaration of a nested function. */
4884 if (storage_class == csc_auto && current_scope != file_scope)
4885 DECL_EXTERNAL (decl) = 0;
4886 /* In C99, a function which is declared 'inline' with 'extern'
4887 is not an external reference (which is confusing). It
4888 means that the later definition of the function must be output
4889 in this file, C99 6.7.4p6. In GNU C89, a function declared
4890 'extern inline' is an external reference. */
4891 else if (declspecs->inline_p && storage_class != csc_static)
4892 DECL_EXTERNAL (decl) = ((storage_class == csc_extern)
4893 == flag_gnu89_inline);
4895 DECL_EXTERNAL (decl) = !initialized;
4897 /* Record absence of global scope for `static' or `auto'. */
4899 = !(storage_class == csc_static || storage_class == csc_auto);
4901 /* For a function definition, record the argument information
4902 block where store_parm_decls will look for it. */
4904 current_function_arg_info = arg_info;
4906 if (declspecs->default_int_p)
4907 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4909 /* Record presence of `inline', if it is reasonable. */
4910 if (flag_hosted && MAIN_NAME_P (declarator->u.id))
4912 if (declspecs->inline_p)
4913 pedwarn ("cannot inline function %<main%>");
4915 else if (declspecs->inline_p)
4917 /* Record that the function is declared `inline'. */
4918 DECL_DECLARED_INLINE_P (decl) = 1;
4920 /* Do not mark bare declarations as DECL_INLINE. Doing so
4921 in the presence of multiple declarations can result in
4922 the abstract origin pointing between the declarations,
4923 which will confuse dwarf2out. */
4925 DECL_INLINE (decl) = 1;
4927 /* If -finline-functions, assume it can be inlined. This does
4928 two things: let the function be deferred until it is actually
4929 needed, and let dwarf2 know that the function is inlinable. */
4930 else if (flag_inline_trees == 2 && initialized)
4931 DECL_INLINE (decl) = 1;
4935 /* It's a variable. */
4936 /* An uninitialized decl with `extern' is a reference. */
4937 int extern_ref = !initialized && storage_class == csc_extern;
4939 type = c_build_qualified_type (type, type_quals);
4941 /* C99 6.2.2p7: It is invalid (compile-time undefined
4942 behavior) to create an 'extern' declaration for a
4943 variable if there is a global declaration that is
4944 'static' and the global declaration is not visible.
4945 (If the static declaration _is_ currently visible,
4946 the 'extern' declaration is taken to refer to that decl.) */
4947 if (extern_ref && current_scope != file_scope)
4949 tree global_decl = identifier_global_value (declarator->u.id);
4950 tree visible_decl = lookup_name (declarator->u.id);
4953 && global_decl != visible_decl
4954 && TREE_CODE (global_decl) == VAR_DECL
4955 && !TREE_PUBLIC (global_decl))
4956 error ("variable previously declared %<static%> redeclared "
4960 decl = build_decl (VAR_DECL, declarator->u.id, type);
4961 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4963 C_DECL_VARIABLE_SIZE (decl) = 1;
4965 if (declspecs->inline_p)
4966 pedwarn ("variable %q+D declared %<inline%>", decl);
4968 /* At file scope, an initialized extern declaration may follow
4969 a static declaration. In that case, DECL_EXTERNAL will be
4970 reset later in start_decl. */
4971 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
4973 /* At file scope, the presence of a `static' or `register' storage
4974 class specifier, or the absence of all storage class specifiers
4975 makes this declaration a definition (perhaps tentative). Also,
4976 the absence of `static' makes it public. */
4977 if (current_scope == file_scope)
4979 TREE_PUBLIC (decl) = storage_class != csc_static;
4980 TREE_STATIC (decl) = !extern_ref;
4982 /* Not at file scope, only `static' makes a static definition. */
4985 TREE_STATIC (decl) = (storage_class == csc_static);
4986 TREE_PUBLIC (decl) = extern_ref;
4991 if (targetm.have_tls)
4992 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
4994 /* A mere warning is sure to result in improper semantics
4995 at runtime. Don't bother to allow this to compile. */
4996 error ("thread-local storage not supported for this target");
5000 if (storage_class == csc_extern
5001 && variably_modified_type_p (type, NULL_TREE))
5004 error ("object with variably modified type must have no linkage");
5007 /* Record `register' declaration for warnings on &
5008 and in case doing stupid register allocation. */
5010 if (storage_class == csc_register)
5012 C_DECL_REGISTER (decl) = 1;
5013 DECL_REGISTER (decl) = 1;
5016 /* Record constancy and volatility. */
5017 c_apply_type_quals_to_decl (type_quals, decl);
5019 /* If a type has volatile components, it should be stored in memory.
5020 Otherwise, the fact that those components are volatile
5021 will be ignored, and would even crash the compiler.
5022 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
5023 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl))
5024 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL
5025 || TREE_CODE (decl) == RESULT_DECL))
5027 /* It is not an error for a structure with volatile fields to
5028 be declared register, but reset DECL_REGISTER since it
5029 cannot actually go in a register. */
5030 int was_reg = C_DECL_REGISTER (decl);
5031 C_DECL_REGISTER (decl) = 0;
5032 DECL_REGISTER (decl) = 0;
5033 c_mark_addressable (decl);
5034 C_DECL_REGISTER (decl) = was_reg;
5037 /* This is the earliest point at which we might know the assembler
5038 name of a variable. Thus, if it's known before this, die horribly. */
5039 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
5041 decl_attributes (&decl, returned_attrs, 0);
5047 /* Decode the parameter-list info for a function type or function definition.
5048 The argument is the value returned by `get_parm_info' (or made in c-parse.c
5049 if there is an identifier list instead of a parameter decl list).
5050 These two functions are separate because when a function returns
5051 or receives functions then each is called multiple times but the order
5052 of calls is different. The last call to `grokparms' is always the one
5053 that contains the formal parameter names of a function definition.
5055 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5057 FUNCDEF_FLAG is true for a function definition, false for
5058 a mere declaration. A nonempty identifier-list gets an error message
5059 when FUNCDEF_FLAG is false. */
5062 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
5064 tree arg_types = arg_info->types;
5066 if (funcdef_flag && arg_info->had_vla_unspec)
5068 /* A function definition isn't function prototype scope C99 6.2.1p4. */
5070 error ("%<[*]%> not allowed in other than function prototype scope");
5073 if (arg_types == 0 && !funcdef_flag && !in_system_header)
5074 warning (OPT_Wstrict_prototypes,
5075 "function declaration isn%'t a prototype");
5077 if (arg_types == error_mark_node)
5078 return 0; /* don't set TYPE_ARG_TYPES in this case */
5080 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
5083 pedwarn ("parameter names (without types) in function declaration");
5085 arg_info->parms = arg_info->types;
5086 arg_info->types = 0;
5091 tree parm, type, typelt;
5092 unsigned int parmno;
5094 /* If there is a parameter of incomplete type in a definition,
5095 this is an error. In a declaration this is valid, and a
5096 struct or union type may be completed later, before any calls
5097 or definition of the function. In the case where the tag was
5098 first declared within the parameter list, a warning has
5099 already been given. If a parameter has void type, then
5100 however the function cannot be defined or called, so
5103 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
5105 parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
5107 type = TREE_VALUE (typelt);
5108 if (type == error_mark_node)
5111 if (!COMPLETE_TYPE_P (type))
5115 if (DECL_NAME (parm))
5116 error ("parameter %u (%q+D) has incomplete type",
5119 error ("%Jparameter %u has incomplete type",
5122 TREE_VALUE (typelt) = error_mark_node;
5123 TREE_TYPE (parm) = error_mark_node;
5125 else if (VOID_TYPE_P (type))
5127 if (DECL_NAME (parm))
5128 warning (0, "parameter %u (%q+D) has void type",
5131 warning (0, "%Jparameter %u has void type",
5136 if (DECL_NAME (parm) && TREE_USED (parm))
5137 warn_if_shadowing (parm);
5143 /* Take apart the current scope and return a c_arg_info structure with
5144 info on a parameter list just parsed.
5146 This structure is later fed to 'grokparms' and 'store_parm_decls'.
5148 ELLIPSIS being true means the argument list ended in '...' so don't
5149 append a sentinel (void_list_node) to the end of the type-list. */
5152 get_parm_info (bool ellipsis)
5154 struct c_binding *b = current_scope->bindings;
5155 struct c_arg_info *arg_info = XOBNEW (&parser_obstack,
5162 static bool explained_incomplete_types = false;
5163 bool gave_void_only_once_err = false;
5165 arg_info->parms = 0;
5167 arg_info->types = 0;
5168 arg_info->others = 0;
5169 arg_info->pending_sizes = 0;
5170 arg_info->had_vla_unspec = current_scope->had_vla_unspec;
5172 /* The bindings in this scope must not get put into a block.
5173 We will take care of deleting the binding nodes. */
5174 current_scope->bindings = 0;
5176 /* This function is only called if there was *something* on the
5180 /* A parameter list consisting solely of 'void' indicates that the
5181 function takes no arguments. But if the 'void' is qualified
5182 (by 'const' or 'volatile'), or has a storage class specifier
5183 ('register'), then the behavior is undefined; issue an error.
5184 Typedefs for 'void' are OK (see DR#157). */
5185 if (b->prev == 0 /* one binding */
5186 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
5187 && !DECL_NAME (b->decl) /* anonymous */
5188 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
5190 if (TREE_THIS_VOLATILE (b->decl)
5191 || TREE_READONLY (b->decl)
5192 || C_DECL_REGISTER (b->decl))
5193 error ("%<void%> as only parameter may not be qualified");
5195 /* There cannot be an ellipsis. */
5197 error ("%<void%> must be the only parameter");
5199 arg_info->types = void_list_node;
5204 types = void_list_node;
5206 /* Break up the bindings list into parms, tags, types, and others;
5207 apply sanity checks; purge the name-to-decl bindings. */
5210 tree decl = b->decl;
5211 tree type = TREE_TYPE (decl);
5212 const char *keyword;
5214 switch (TREE_CODE (decl))
5219 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
5220 I_SYMBOL_BINDING (b->id) = b->shadowed;
5223 /* Check for forward decls that never got their actual decl. */
5224 if (TREE_ASM_WRITTEN (decl))
5225 error ("parameter %q+D has just a forward declaration", decl);
5226 /* Check for (..., void, ...) and issue an error. */
5227 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
5229 if (!gave_void_only_once_err)
5231 error ("%<void%> must be the only parameter");
5232 gave_void_only_once_err = true;
5237 /* Valid parameter, add it to the list. */
5238 TREE_CHAIN (decl) = parms;
5241 /* Since there is a prototype, args are passed in their
5242 declared types. The back end may override this later. */
5243 DECL_ARG_TYPE (decl) = type;
5244 types = tree_cons (0, type, types);
5248 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
5249 case UNION_TYPE: keyword = "union"; goto tag;
5250 case RECORD_TYPE: keyword = "struct"; goto tag;
5252 /* Types may not have tag-names, in which case the type
5253 appears in the bindings list with b->id NULL. */
5256 gcc_assert (I_TAG_BINDING (b->id) == b);
5257 I_TAG_BINDING (b->id) = b->shadowed;
5260 /* Warn about any struct, union or enum tags defined in a
5261 parameter list. The scope of such types is limited to
5262 the parameter list, which is rarely if ever desirable
5263 (it's impossible to call such a function with type-
5264 correct arguments). An anonymous union parm type is
5265 meaningful as a GNU extension, so don't warn for that. */
5266 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
5269 /* The %s will be one of 'struct', 'union', or 'enum'. */
5270 warning (0, "%<%s %E%> declared inside parameter list",
5273 /* The %s will be one of 'struct', 'union', or 'enum'. */
5274 warning (0, "anonymous %s declared inside parameter list",
5277 if (!explained_incomplete_types)
5279 warning (0, "its scope is only this definition or declaration,"
5280 " which is probably not what you want");
5281 explained_incomplete_types = true;
5285 tags = tree_cons (b->id, decl, tags);
5291 /* CONST_DECLs appear here when we have an embedded enum,
5292 and TYPE_DECLs appear here when we have an embedded struct
5293 or union. No warnings for this - we already warned about the
5294 type itself. FUNCTION_DECLs appear when there is an implicit
5295 function declaration in the parameter list. */
5297 TREE_CHAIN (decl) = others;
5302 /* error_mark_node appears here when we have an undeclared
5303 variable. Just throw it away. */
5306 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
5307 I_SYMBOL_BINDING (b->id) = b->shadowed;
5311 /* Other things that might be encountered. */
5318 b = free_binding_and_advance (b);
5321 arg_info->parms = parms;
5322 arg_info->tags = tags;
5323 arg_info->types = types;
5324 arg_info->others = others;
5325 arg_info->pending_sizes = get_pending_sizes ();
5329 /* Get the struct, enum or union (CODE says which) with tag NAME.
5330 Define the tag as a forward-reference if it is not defined.
5331 Return a c_typespec structure for the type specifier. */
5334 parser_xref_tag (enum tree_code code, tree name)
5336 struct c_typespec ret;
5337 /* If a cross reference is requested, look up the type
5338 already defined for this tag and return it. */
5340 tree ref = lookup_tag (code, name, 0);
5341 /* If this is the right type of tag, return what we found.
5342 (This reference will be shadowed by shadow_tag later if appropriate.)
5343 If this is the wrong type of tag, do not return it. If it was the
5344 wrong type in the same scope, we will have had an error
5345 message already; if in a different scope and declaring
5346 a name, pending_xref_error will give an error message; but if in a
5347 different scope and not declaring a name, this tag should
5348 shadow the previous declaration of a different type of tag, and
5349 this would not work properly if we return the reference found.
5350 (For example, with "struct foo" in an outer scope, "union foo;"
5351 must shadow that tag with a new one of union type.) */
5352 ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref);
5353 if (ref && TREE_CODE (ref) == code)
5359 /* If no such tag is yet defined, create a forward-reference node
5360 and record it as the "definition".
5361 When a real declaration of this type is found,
5362 the forward-reference will be altered into a real type. */
5364 ref = make_node (code);
5365 if (code == ENUMERAL_TYPE)
5367 /* Give the type a default layout like unsigned int
5368 to avoid crashing if it does not get defined. */
5369 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5370 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5371 TYPE_USER_ALIGN (ref) = 0;
5372 TYPE_UNSIGNED (ref) = 1;
5373 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5374 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5375 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5378 pushtag (name, ref);
5384 /* Get the struct, enum or union (CODE says which) with tag NAME.
5385 Define the tag as a forward-reference if it is not defined.
5386 Return a tree for the type. */
5389 xref_tag (enum tree_code code, tree name)
5391 return parser_xref_tag (code, name).spec;
5394 /* Make sure that the tag NAME is defined *in the current scope*
5395 at least as a forward reference.
5396 CODE says which kind of tag NAME ought to be. */
5399 start_struct (enum tree_code code, tree name)
5401 /* If there is already a tag defined at this scope
5402 (as a forward reference), just return it. */
5407 ref = lookup_tag (code, name, 1);
5408 if (ref && TREE_CODE (ref) == code)
5410 if (TYPE_SIZE (ref))
5412 if (code == UNION_TYPE)
5413 error ("redefinition of %<union %E%>", name);
5415 error ("redefinition of %<struct %E%>", name);
5417 else if (C_TYPE_BEING_DEFINED (ref))
5419 if (code == UNION_TYPE)
5420 error ("nested redefinition of %<union %E%>", name);
5422 error ("nested redefinition of %<struct %E%>", name);
5423 /* Don't create structures that contain themselves. */
5428 /* Otherwise create a forward-reference just so the tag is in scope. */
5430 if (ref == NULL_TREE || TREE_CODE (ref) != code)
5432 ref = make_node (code);
5433 pushtag (name, ref);
5436 C_TYPE_BEING_DEFINED (ref) = 1;
5437 TYPE_PACKED (ref) = flag_pack_struct;
5441 /* Process the specs, declarator and width (NULL if omitted)
5442 of a structure component, returning a FIELD_DECL node.
5443 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
5445 This is done during the parsing of the struct declaration.
5446 The FIELD_DECL nodes are chained together and the lot of them
5447 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5450 grokfield (struct c_declarator *declarator, struct c_declspecs *declspecs,
5455 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
5456 && width == NULL_TREE)
5458 /* This is an unnamed decl.
5460 If we have something of the form "union { list } ;" then this
5461 is the anonymous union extension. Similarly for struct.
5463 If this is something of the form "struct foo;", then
5464 If MS extensions are enabled, this is handled as an
5466 Otherwise this is a forward declaration of a structure tag.
5468 If this is something of the form "foo;" and foo is a TYPE_DECL, then
5469 If MS extensions are enabled and foo names a structure, then
5470 again this is an anonymous struct.
5471 Otherwise this is an error.
5473 Oh what a horrid tangled web we weave. I wonder if MS consciously
5474 took this from Plan 9 or if it was an accident of implementation
5475 that took root before someone noticed the bug... */
5477 tree type = declspecs->type;
5478 bool type_ok = (TREE_CODE (type) == RECORD_TYPE
5479 || TREE_CODE (type) == UNION_TYPE);
5483 && (flag_ms_extensions || !declspecs->typedef_p))
5485 if (flag_ms_extensions)
5489 else if (TYPE_NAME (type) == NULL)
5496 pedwarn ("declaration does not declare anything");
5500 pedwarn ("ISO C doesn%'t support unnamed structs/unions");
5503 value = grokdeclarator (declarator, declspecs, FIELD, false,
5504 width ? &width : NULL);
5506 finish_decl (value, NULL_TREE, NULL_TREE);
5507 DECL_INITIAL (value) = width;
5512 /* Generate an error for any duplicate field names in FIELDLIST. Munge
5513 the list such that this does not present a problem later. */
5516 detect_field_duplicates (tree fieldlist)
5521 /* First, see if there are more than "a few" fields.
5522 This is trivially true if there are zero or one fields. */
5525 x = TREE_CHAIN (fieldlist);
5531 } while (timeout > 0 && x);
5533 /* If there were "few" fields, avoid the overhead of allocating
5534 a hash table. Instead just do the nested traversal thing. */
5537 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
5540 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
5541 if (DECL_NAME (y) == DECL_NAME (x))
5543 error ("duplicate member %q+D", x);
5544 DECL_NAME (x) = NULL_TREE;
5550 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
5553 for (x = fieldlist; x ; x = TREE_CHAIN (x))
5554 if ((y = DECL_NAME (x)) != 0)
5556 slot = htab_find_slot (htab, y, INSERT);
5559 error ("duplicate member %q+D", x);
5560 DECL_NAME (x) = NULL_TREE;
5569 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5570 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5571 ATTRIBUTES are attributes to be applied to the structure. */
5574 finish_struct (tree t, tree fieldlist, tree attributes)
5577 bool toplevel = file_scope == current_scope;
5578 int saw_named_field;
5580 /* If this type was previously laid out as a forward reference,
5581 make sure we lay it out again. */
5585 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5589 for (x = fieldlist; x; x = TREE_CHAIN (x))
5590 if (DECL_NAME (x) != 0)
5595 if (TREE_CODE (t) == UNION_TYPE)
5598 pedwarn ("union has no named members");
5600 pedwarn ("union has no members");
5605 pedwarn ("struct has no named members");
5607 pedwarn ("struct has no members");
5612 /* Install struct as DECL_CONTEXT of each field decl.
5613 Also process specified field sizes, found in the DECL_INITIAL,
5614 storing 0 there after the type has been changed to precision equal
5615 to its width, rather than the precision of the specified standard
5616 type. (Correct layout requires the original type to have been preserved
5619 saw_named_field = 0;
5620 for (x = fieldlist; x; x = TREE_CHAIN (x))
5622 if (TREE_TYPE (x) == error_mark_node)
5625 DECL_CONTEXT (x) = t;
5627 if (TYPE_PACKED (t) && TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT)
5628 DECL_PACKED (x) = 1;
5630 /* If any field is const, the structure type is pseudo-const. */
5631 if (TREE_READONLY (x))
5632 C_TYPE_FIELDS_READONLY (t) = 1;
5635 /* A field that is pseudo-const makes the structure likewise. */
5636 tree t1 = TREE_TYPE (x);
5637 while (TREE_CODE (t1) == ARRAY_TYPE)
5638 t1 = TREE_TYPE (t1);
5639 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5640 && C_TYPE_FIELDS_READONLY (t1))
5641 C_TYPE_FIELDS_READONLY (t) = 1;
5644 /* Any field that is volatile means variables of this type must be
5645 treated in some ways as volatile. */
5646 if (TREE_THIS_VOLATILE (x))
5647 C_TYPE_FIELDS_VOLATILE (t) = 1;
5649 /* Any field of nominal variable size implies structure is too. */
5650 if (C_DECL_VARIABLE_SIZE (x))
5651 C_TYPE_VARIABLE_SIZE (t) = 1;
5653 if (DECL_INITIAL (x))
5655 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
5656 DECL_SIZE (x) = bitsize_int (width);
5657 DECL_BIT_FIELD (x) = 1;
5658 SET_DECL_C_BIT_FIELD (x);
5661 /* Detect flexible array member in an invalid context. */
5662 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5663 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5664 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5665 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5667 if (TREE_CODE (t) == UNION_TYPE)
5669 error ("%Jflexible array member in union", x);
5670 TREE_TYPE (x) = error_mark_node;
5672 else if (TREE_CHAIN (x) != NULL_TREE)
5674 error ("%Jflexible array member not at end of struct", x);
5675 TREE_TYPE (x) = error_mark_node;
5677 else if (!saw_named_field)
5679 error ("%Jflexible array member in otherwise empty struct", x);
5680 TREE_TYPE (x) = error_mark_node;
5684 if (pedantic && !in_system_header && TREE_CODE (t) == RECORD_TYPE
5685 && flexible_array_type_p (TREE_TYPE (x)))
5686 pedwarn ("%Jinvalid use of structure with flexible array member", x);
5689 saw_named_field = 1;
5692 detect_field_duplicates (fieldlist);
5694 /* Now we have the nearly final fieldlist. Record it,
5695 then lay out the structure or union (including the fields). */
5697 TYPE_FIELDS (t) = fieldlist;
5701 /* Give bit-fields their proper types. */
5703 tree *fieldlistp = &fieldlist;
5705 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
5706 && TREE_TYPE (*fieldlistp) != error_mark_node)
5708 unsigned HOST_WIDE_INT width
5709 = tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
5710 tree type = TREE_TYPE (*fieldlistp);
5711 if (width != TYPE_PRECISION (type))
5713 TREE_TYPE (*fieldlistp)
5714 = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type));
5715 DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp));
5717 DECL_INITIAL (*fieldlistp) = 0;
5720 fieldlistp = &TREE_CHAIN (*fieldlistp);
5723 /* Now we have the truly final field list.
5724 Store it in this type and in the variants. */
5726 TYPE_FIELDS (t) = fieldlist;
5728 /* If there are lots of fields, sort so we can look through them fast.
5729 We arbitrarily consider 16 or more elts to be "a lot". */
5734 for (x = fieldlist; x; x = TREE_CHAIN (x))
5736 if (len > 15 || DECL_NAME (x) == NULL)
5744 struct lang_type *space;
5745 struct sorted_fields_type *space2;
5747 len += list_length (x);
5749 /* Use the same allocation policy here that make_node uses, to
5750 ensure that this lives as long as the rest of the struct decl.
5751 All decls in an inline function need to be saved. */
5753 space = GGC_CNEW (struct lang_type);
5754 space2 = GGC_NEWVAR (struct sorted_fields_type,
5755 sizeof (struct sorted_fields_type) + len * sizeof (tree));
5759 field_array = &space2->elts[0];
5760 for (x = fieldlist; x; x = TREE_CHAIN (x))
5762 field_array[len++] = x;
5764 /* If there is anonymous struct or union, break out of the loop. */
5765 if (DECL_NAME (x) == NULL)
5768 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5771 TYPE_LANG_SPECIFIC (t) = space;
5772 TYPE_LANG_SPECIFIC (t)->s->len = len;
5773 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5774 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5779 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5781 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5782 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5783 C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t);
5784 C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t);
5785 C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t);
5788 /* If this was supposed to be a transparent union, but we can't
5789 make it one, warn and turn off the flag. */
5790 if (TREE_CODE (t) == UNION_TYPE
5791 && TYPE_TRANSPARENT_UNION (t)
5792 && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t))))
5794 TYPE_TRANSPARENT_UNION (t) = 0;
5795 warning (0, "union cannot be made transparent");
5798 /* If this structure or union completes the type of any previous
5799 variable declaration, lay it out and output its rtl. */
5800 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5804 tree decl = TREE_VALUE (x);
5805 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5806 layout_array_type (TREE_TYPE (decl));
5807 if (TREE_CODE (decl) != TYPE_DECL)
5809 layout_decl (decl, 0);
5810 if (c_dialect_objc ())
5811 objc_check_decl (decl);
5812 rest_of_decl_compilation (decl, toplevel, 0);
5817 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5819 /* Finish debugging output for this type. */
5820 rest_of_type_compilation (t, toplevel);
5822 /* If we're inside a function proper, i.e. not file-scope and not still
5823 parsing parameters, then arrange for the size of a variable sized type
5825 if (cur_stmt_list && variably_modified_type_p (t, NULL_TREE))
5826 add_stmt (build_stmt (DECL_EXPR, build_decl (TYPE_DECL, NULL, t)));
5831 /* Lay out the type T, and its element type, and so on. */
5834 layout_array_type (tree t)
5836 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5837 layout_array_type (TREE_TYPE (t));
5841 /* Begin compiling the definition of an enumeration type.
5842 NAME is its name (or null if anonymous).
5843 Returns the type object, as yet incomplete.
5844 Also records info about it so that build_enumerator
5845 may be used to declare the individual values as they are read. */
5848 start_enum (tree name)
5852 /* If this is the real definition for a previous forward reference,
5853 fill in the contents in the same object that used to be the
5854 forward reference. */
5857 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5859 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5861 enumtype = make_node (ENUMERAL_TYPE);
5862 pushtag (name, enumtype);
5865 if (C_TYPE_BEING_DEFINED (enumtype))
5866 error ("nested redefinition of %<enum %E%>", name);
5868 C_TYPE_BEING_DEFINED (enumtype) = 1;
5870 if (TYPE_VALUES (enumtype) != 0)
5872 /* This enum is a named one that has been declared already. */
5873 error ("redeclaration of %<enum %E%>", name);
5875 /* Completely replace its old definition.
5876 The old enumerators remain defined, however. */
5877 TYPE_VALUES (enumtype) = 0;
5880 enum_next_value = integer_zero_node;
5883 if (flag_short_enums)
5884 TYPE_PACKED (enumtype) = 1;
5889 /* After processing and defining all the values of an enumeration type,
5890 install their decls in the enumeration type and finish it off.
5891 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5892 and ATTRIBUTES are the specified attributes.
5893 Returns ENUMTYPE. */
5896 finish_enum (tree enumtype, tree values, tree attributes)
5899 tree minnode = 0, maxnode = 0;
5900 int precision, unsign;
5901 bool toplevel = (file_scope == current_scope);
5902 struct lang_type *lt;
5904 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5906 /* Calculate the maximum value of any enumerator in this type. */
5908 if (values == error_mark_node)
5909 minnode = maxnode = integer_zero_node;
5912 minnode = maxnode = TREE_VALUE (values);
5913 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5915 tree value = TREE_VALUE (pair);
5916 if (tree_int_cst_lt (maxnode, value))
5918 if (tree_int_cst_lt (value, minnode))
5923 /* Construct the final type of this enumeration. It is the same
5924 as one of the integral types - the narrowest one that fits, except
5925 that normally we only go as narrow as int - and signed iff any of
5926 the values are negative. */
5927 unsign = (tree_int_cst_sgn (minnode) >= 0);
5928 precision = MAX (min_precision (minnode, unsign),
5929 min_precision (maxnode, unsign));
5931 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5933 tem = c_common_type_for_size (precision, unsign);
5936 warning (0, "enumeration values exceed range of largest integer");
5937 tem = long_long_integer_type_node;
5941 tem = unsign ? unsigned_type_node : integer_type_node;
5943 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
5944 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
5945 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
5946 TYPE_SIZE (enumtype) = 0;
5948 /* If the precision of the type was specific with an attribute and it
5949 was too small, give an error. Otherwise, use it. */
5950 if (TYPE_PRECISION (enumtype))
5952 if (precision > TYPE_PRECISION (enumtype))
5953 error ("specified mode too small for enumeral values");
5956 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
5958 layout_type (enumtype);
5960 if (values != error_mark_node)
5962 /* Change the type of the enumerators to be the enum type. We
5963 need to do this irrespective of the size of the enum, for
5964 proper type checking. Replace the DECL_INITIALs of the
5965 enumerators, and the value slots of the list, with copies
5966 that have the enum type; they cannot be modified in place
5967 because they may be shared (e.g. integer_zero_node) Finally,
5968 change the purpose slots to point to the names of the decls. */
5969 for (pair = values; pair; pair = TREE_CHAIN (pair))
5971 tree enu = TREE_PURPOSE (pair);
5972 tree ini = DECL_INITIAL (enu);
5974 TREE_TYPE (enu) = enumtype;
5976 /* The ISO C Standard mandates enumerators to have type int,
5977 even though the underlying type of an enum type is
5978 unspecified. Here we convert any enumerators that fit in
5979 an int to type int, to avoid promotions to unsigned types
5980 when comparing integers with enumerators that fit in the
5981 int range. When -pedantic is given, build_enumerator()
5982 would have already taken care of those that don't fit. */
5983 if (int_fits_type_p (ini, integer_type_node))
5984 tem = integer_type_node;
5987 ini = convert (tem, ini);
5989 DECL_INITIAL (enu) = ini;
5990 TREE_PURPOSE (pair) = DECL_NAME (enu);
5991 TREE_VALUE (pair) = ini;
5994 TYPE_VALUES (enumtype) = values;
5997 /* Record the min/max values so that we can warn about bit-field
5998 enumerations that are too small for the values. */
5999 lt = GGC_CNEW (struct lang_type);
6000 lt->enum_min = minnode;
6001 lt->enum_max = maxnode;
6002 TYPE_LANG_SPECIFIC (enumtype) = lt;
6004 /* Fix up all variant types of this enum type. */
6005 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
6007 if (tem == enumtype)
6009 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
6010 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
6011 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
6012 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
6013 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
6014 TYPE_MODE (tem) = TYPE_MODE (enumtype);
6015 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
6016 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
6017 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
6018 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
6019 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
6022 /* Finish debugging output for this type. */
6023 rest_of_type_compilation (enumtype, toplevel);
6028 /* Build and install a CONST_DECL for one value of the
6029 current enumeration type (one that was begun with start_enum).
6030 Return a tree-list containing the CONST_DECL and its value.
6031 Assignment of sequential values by default is handled here. */
6034 build_enumerator (tree name, tree value)
6038 /* Validate and default VALUE. */
6042 /* Don't issue more errors for error_mark_node (i.e. an
6043 undeclared identifier) - just ignore the value expression. */
6044 if (value == error_mark_node)
6046 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value))
6047 || TREE_CODE (value) != INTEGER_CST)
6049 error ("enumerator value for %qE is not an integer constant", name);
6054 value = default_conversion (value);
6055 constant_expression_warning (value);
6059 /* Default based on previous value. */
6060 /* It should no longer be possible to have NON_LVALUE_EXPR
6064 value = enum_next_value;
6066 error ("overflow in enumeration values");
6069 if (pedantic && !int_fits_type_p (value, integer_type_node))
6071 pedwarn ("ISO C restricts enumerator values to range of %<int%>");
6072 /* XXX This causes -pedantic to change the meaning of the program.
6073 Remove? -zw 2004-03-15 */
6074 value = convert (integer_type_node, value);
6077 /* Set basis for default for next value. */
6078 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
6079 enum_overflow = tree_int_cst_lt (enum_next_value, value);
6081 /* Now create a declaration for the enum value name. */
6083 type = TREE_TYPE (value);
6084 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
6085 TYPE_PRECISION (integer_type_node)),
6086 (TYPE_PRECISION (type)
6087 >= TYPE_PRECISION (integer_type_node)
6088 && TYPE_UNSIGNED (type)));
6090 decl = build_decl (CONST_DECL, name, type);
6091 DECL_INITIAL (decl) = convert (type, value);
6094 return tree_cons (decl, value, NULL_TREE);
6098 /* Create the FUNCTION_DECL for a function definition.
6099 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
6100 the declaration; they describe the function's name and the type it returns,
6101 but twisted together in a fashion that parallels the syntax of C.
6103 This function creates a binding context for the function body
6104 as well as setting up the FUNCTION_DECL in current_function_decl.
6106 Returns 1 on success. If the DECLARATOR is not suitable for a function
6107 (it defines a datum instead), we return 0, which tells
6108 yyparse to report a parse error. */
6111 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
6114 tree decl1, old_decl;
6115 tree restype, resdecl;
6116 struct c_label_context_se *nstack_se;
6117 struct c_label_context_vm *nstack_vm;
6119 current_function_returns_value = 0; /* Assume, until we see it does. */
6120 current_function_returns_null = 0;
6121 current_function_returns_abnormally = 0;
6122 warn_about_return_type = 0;
6123 c_switch_stack = NULL;
6125 nstack_se = XOBNEW (&parser_obstack, struct c_label_context_se);
6126 nstack_se->labels_def = NULL;
6127 nstack_se->labels_used = NULL;
6128 nstack_se->next = label_context_stack_se;
6129 label_context_stack_se = nstack_se;
6131 nstack_vm = XOBNEW (&parser_obstack, struct c_label_context_vm);
6132 nstack_vm->labels_def = NULL;
6133 nstack_vm->labels_used = NULL;
6134 nstack_vm->scope = 0;
6135 nstack_vm->next = label_context_stack_vm;
6136 label_context_stack_vm = nstack_vm;
6138 /* Indicate no valid break/continue context by setting these variables
6139 to some non-null, non-label value. We'll notice and emit the proper
6140 error message in c_finish_bc_stmt. */
6141 c_break_label = c_cont_label = size_zero_node;
6143 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL);
6145 /* If the declarator is not suitable for a function definition,
6146 cause a syntax error. */
6149 label_context_stack_se = label_context_stack_se->next;
6150 label_context_stack_vm = label_context_stack_vm->next;
6154 decl_attributes (&decl1, attributes, 0);
6156 if (DECL_DECLARED_INLINE_P (decl1)
6157 && DECL_UNINLINABLE (decl1)
6158 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
6159 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
6162 /* Handle gnu_inline attribute. */
6163 if (declspecs->inline_p
6164 && !flag_gnu89_inline
6165 && TREE_CODE (decl1) == FUNCTION_DECL
6166 && lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1)))
6168 if (declspecs->storage_class != csc_static)
6169 DECL_EXTERNAL (decl1) = !DECL_EXTERNAL (decl1);
6172 announce_function (decl1);
6174 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
6176 error ("return type is an incomplete type");
6177 /* Make it return void instead. */
6179 = build_function_type (void_type_node,
6180 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6183 if (warn_about_return_type)
6184 pedwarn_c99 ("return type defaults to %<int%>");
6186 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6187 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
6188 DECL_INITIAL (decl1) = error_mark_node;
6190 /* If this definition isn't a prototype and we had a prototype declaration
6191 before, copy the arg type info from that prototype. */
6192 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
6193 if (old_decl && TREE_CODE (old_decl) != FUNCTION_DECL)
6195 current_function_prototype_locus = UNKNOWN_LOCATION;
6196 current_function_prototype_built_in = false;
6197 current_function_prototype_arg_types = NULL_TREE;
6198 if (TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6200 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6201 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
6202 TREE_TYPE (TREE_TYPE (old_decl))))
6204 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
6206 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
6207 current_function_prototype_built_in
6208 = C_DECL_BUILTIN_PROTOTYPE (old_decl);
6209 current_function_prototype_arg_types
6210 = TYPE_ARG_TYPES (TREE_TYPE (decl1));
6212 if (TREE_PUBLIC (decl1))
6214 /* If there is an external prototype declaration of this
6215 function, record its location but do not copy information
6216 to this decl. This may be an invisible declaration
6217 (built-in or in a scope which has finished) or simply
6218 have more refined argument types than any declaration
6220 struct c_binding *b;
6221 for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed)
6222 if (B_IN_SCOPE (b, external_scope))
6226 tree ext_decl, ext_type;
6228 ext_type = b->type ? b->type : TREE_TYPE (ext_decl);
6229 if (TREE_CODE (ext_type) == FUNCTION_TYPE
6230 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
6231 TREE_TYPE (ext_type)))
6233 current_function_prototype_locus
6234 = DECL_SOURCE_LOCATION (ext_decl);
6235 current_function_prototype_built_in
6236 = C_DECL_BUILTIN_PROTOTYPE (ext_decl);
6237 current_function_prototype_arg_types
6238 = TYPE_ARG_TYPES (ext_type);
6244 /* Optionally warn of old-fashioned def with no previous prototype. */
6245 if (warn_strict_prototypes
6246 && old_decl != error_mark_node
6247 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6248 && C_DECL_ISNT_PROTOTYPE (old_decl))
6249 warning (OPT_Wstrict_prototypes,
6250 "function declaration isn%'t a prototype");
6251 /* Optionally warn of any global def with no previous prototype. */
6252 else if (warn_missing_prototypes
6253 && old_decl != error_mark_node
6254 && TREE_PUBLIC (decl1)
6255 && !MAIN_NAME_P (DECL_NAME (decl1))
6256 && C_DECL_ISNT_PROTOTYPE (old_decl))
6257 warning (OPT_Wmissing_prototypes, "no previous prototype for %q+D", decl1);
6258 /* Optionally warn of any def with no previous prototype
6259 if the function has already been used. */
6260 else if (warn_missing_prototypes
6262 && old_decl != error_mark_node
6263 && TREE_USED (old_decl)
6264 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6265 warning (OPT_Wmissing_prototypes,
6266 "%q+D was used with no prototype before its definition", decl1);
6267 /* Optionally warn of any global def with no previous declaration. */
6268 else if (warn_missing_declarations
6269 && TREE_PUBLIC (decl1)
6271 && !MAIN_NAME_P (DECL_NAME (decl1)))
6272 warning (OPT_Wmissing_declarations, "no previous declaration for %q+D",
6274 /* Optionally warn of any def with no previous declaration
6275 if the function has already been used. */
6276 else if (warn_missing_declarations
6278 && old_decl != error_mark_node
6279 && TREE_USED (old_decl)
6280 && C_DECL_IMPLICIT (old_decl))
6281 warning (OPT_Wmissing_declarations,
6282 "%q+D was used with no declaration before its definition", decl1);
6284 /* This function exists in static storage.
6285 (This does not mean `static' in the C sense!) */
6286 TREE_STATIC (decl1) = 1;
6288 /* A nested function is not global. */
6289 if (current_function_decl != 0)
6290 TREE_PUBLIC (decl1) = 0;
6292 /* This is the earliest point at which we might know the assembler
6293 name of the function. Thus, if it's set before this, die horribly. */
6294 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
6296 /* If #pragma weak was used, mark the decl weak now. */
6297 if (current_scope == file_scope)
6298 maybe_apply_pragma_weak (decl1);
6300 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6301 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
6306 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6307 != integer_type_node)
6308 pedwarn ("return type of %q+D is not %<int%>", decl1);
6310 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6311 args = TREE_CHAIN (args))
6313 tree type = args ? TREE_VALUE (args) : 0;
6315 if (type == void_type_node)
6322 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6323 pedwarn ("first argument of %q+D should be %<int%>", decl1);
6327 if (TREE_CODE (type) != POINTER_TYPE
6328 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6329 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6331 pedwarn ("second argument of %q+D should be %<char **%>",
6336 if (TREE_CODE (type) != POINTER_TYPE
6337 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6338 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6340 pedwarn ("third argument of %q+D should probably be "
6341 "%<char **%>", decl1);
6346 /* It is intentional that this message does not mention the third
6347 argument because it's only mentioned in an appendix of the
6349 if (argct > 0 && (argct < 2 || argct > 3))
6350 pedwarn ("%q+D takes only zero or two arguments", decl1);
6352 if (!TREE_PUBLIC (decl1))
6353 pedwarn ("%q+D is normally a non-static function", decl1);
6356 /* Record the decl so that the function name is defined.
6357 If we already have a decl for this name, and it is a FUNCTION_DECL,
6358 use the old decl. */
6360 current_function_decl = pushdecl (decl1);
6363 declare_parm_level ();
6365 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6366 /* Promote the value to int before returning it. */
6367 if (c_promoting_integer_type_p (restype))
6369 /* It retains unsignedness if not really getting wider. */
6370 if (TYPE_UNSIGNED (restype)
6371 && (TYPE_PRECISION (restype)
6372 == TYPE_PRECISION (integer_type_node)))
6373 restype = unsigned_type_node;
6375 restype = integer_type_node;
6378 resdecl = build_decl (RESULT_DECL, NULL_TREE, restype);
6379 DECL_ARTIFICIAL (resdecl) = 1;
6380 DECL_IGNORED_P (resdecl) = 1;
6381 DECL_RESULT (current_function_decl) = resdecl;
6383 start_fname_decls ();
6388 /* Subroutine of store_parm_decls which handles new-style function
6389 definitions (prototype format). The parms already have decls, so we
6390 need only record them as in effect and complain if any redundant
6391 old-style parm decls were written. */
6393 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
6397 if (current_scope->bindings)
6399 error ("%Jold-style parameter declarations in prototyped "
6400 "function definition", fndecl);
6402 /* Get rid of the old-style declarations. */
6406 /* Don't issue this warning for nested functions, and don't issue this
6407 warning if we got here because ARG_INFO_TYPES was error_mark_node
6408 (this happens when a function definition has just an ellipsis in
6409 its parameter list). */
6410 else if (!in_system_header && !current_function_scope
6411 && arg_info->types != error_mark_node)
6412 warning (OPT_Wtraditional,
6413 "%Jtraditional C rejects ISO C style function definitions",
6416 /* Now make all the parameter declarations visible in the function body.
6417 We can bypass most of the grunt work of pushdecl. */
6418 for (decl = arg_info->parms; decl; decl = TREE_CHAIN (decl))
6420 DECL_CONTEXT (decl) = current_function_decl;
6421 if (DECL_NAME (decl))
6423 bind (DECL_NAME (decl), decl, current_scope,
6424 /*invisible=*/false, /*nested=*/false);
6425 if (!TREE_USED (decl))
6426 warn_if_shadowing (decl);
6429 error ("%Jparameter name omitted", decl);
6432 /* Record the parameter list in the function declaration. */
6433 DECL_ARGUMENTS (fndecl) = arg_info->parms;
6435 /* Now make all the ancillary declarations visible, likewise. */
6436 for (decl = arg_info->others; decl; decl = TREE_CHAIN (decl))
6438 DECL_CONTEXT (decl) = current_function_decl;
6439 if (DECL_NAME (decl))
6440 bind (DECL_NAME (decl), decl, current_scope,
6441 /*invisible=*/false, /*nested=*/false);
6444 /* And all the tag declarations. */
6445 for (decl = arg_info->tags; decl; decl = TREE_CHAIN (decl))
6446 if (TREE_PURPOSE (decl))
6447 bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope,
6448 /*invisible=*/false, /*nested=*/false);
6451 /* Subroutine of store_parm_decls which handles old-style function
6452 definitions (separate parameter list and declarations). */
6455 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
6457 struct c_binding *b;
6458 tree parm, decl, last;
6459 tree parmids = arg_info->parms;
6460 struct pointer_set_t *seen_args = pointer_set_create ();
6462 if (!in_system_header)
6463 warning (OPT_Wold_style_definition, "%Jold-style function definition",
6466 /* Match each formal parameter name with its declaration. Save each
6467 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
6468 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6470 if (TREE_VALUE (parm) == 0)
6472 error ("%Jparameter name missing from parameter list", fndecl);
6473 TREE_PURPOSE (parm) = 0;
6477 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
6478 if (b && B_IN_CURRENT_SCOPE (b))
6481 /* If we got something other than a PARM_DECL it is an error. */
6482 if (TREE_CODE (decl) != PARM_DECL)
6483 error ("%q+D declared as a non-parameter", decl);
6484 /* If the declaration is already marked, we have a duplicate
6485 name. Complain and ignore the duplicate. */
6486 else if (pointer_set_contains (seen_args, decl))
6488 error ("multiple parameters named %q+D", decl);
6489 TREE_PURPOSE (parm) = 0;
6492 /* If the declaration says "void", complain and turn it into
6494 else if (VOID_TYPE_P (TREE_TYPE (decl)))
6496 error ("parameter %q+D declared with void type", decl);
6497 TREE_TYPE (decl) = integer_type_node;
6498 DECL_ARG_TYPE (decl) = integer_type_node;
6499 layout_decl (decl, 0);
6501 warn_if_shadowing (decl);
6503 /* If no declaration found, default to int. */
6506 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
6507 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
6508 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
6510 warn_if_shadowing (decl);
6513 pedwarn ("type of %q+D defaults to %<int%>", decl);
6514 else if (extra_warnings)
6515 warning (OPT_Wextra, "type of %q+D defaults to %<int%>", decl);
6518 TREE_PURPOSE (parm) = decl;
6519 pointer_set_insert (seen_args, decl);
6522 /* Now examine the parms chain for incomplete declarations
6523 and declarations with no corresponding names. */
6525 for (b = current_scope->bindings; b; b = b->prev)
6528 if (TREE_CODE (parm) != PARM_DECL)
6531 if (TREE_TYPE (parm) != error_mark_node
6532 && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
6534 error ("parameter %q+D has incomplete type", parm);
6535 TREE_TYPE (parm) = error_mark_node;
6538 if (!pointer_set_contains (seen_args, parm))
6540 error ("declaration for parameter %q+D but no such parameter", parm);
6542 /* Pretend the parameter was not missing.
6543 This gets us to a standard state and minimizes
6544 further error messages. */
6545 parmids = chainon (parmids, tree_cons (parm, 0, 0));
6549 /* Chain the declarations together in the order of the list of
6550 names. Store that chain in the function decl, replacing the
6551 list of names. Update the current scope to match. */
6552 DECL_ARGUMENTS (fndecl) = 0;
6554 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6555 if (TREE_PURPOSE (parm))
6557 if (parm && TREE_PURPOSE (parm))
6559 last = TREE_PURPOSE (parm);
6560 DECL_ARGUMENTS (fndecl) = last;
6562 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
6563 if (TREE_PURPOSE (parm))
6565 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6566 last = TREE_PURPOSE (parm);
6568 TREE_CHAIN (last) = 0;
6571 pointer_set_destroy (seen_args);
6573 /* If there was a previous prototype,
6574 set the DECL_ARG_TYPE of each argument according to
6575 the type previously specified, and report any mismatches. */
6577 if (current_function_prototype_arg_types)
6580 for (parm = DECL_ARGUMENTS (fndecl),
6581 type = current_function_prototype_arg_types;
6582 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6583 != void_type_node));
6584 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6586 if (parm == 0 || type == 0
6587 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6589 if (current_function_prototype_built_in)
6590 warning (0, "number of arguments doesn%'t match "
6591 "built-in prototype");
6594 error ("number of arguments doesn%'t match prototype");
6595 error ("%Hprototype declaration",
6596 ¤t_function_prototype_locus);
6600 /* Type for passing arg must be consistent with that
6601 declared for the arg. ISO C says we take the unqualified
6602 type for parameters declared with qualified type. */
6603 if (!comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6604 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6606 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6607 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6609 /* Adjust argument to match prototype. E.g. a previous
6610 `int foo(float);' prototype causes
6611 `int foo(x) float x; {...}' to be treated like
6612 `int foo(float x) {...}'. This is particularly
6613 useful for argument types like uid_t. */
6614 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6616 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
6617 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6618 && TYPE_PRECISION (TREE_TYPE (parm))
6619 < TYPE_PRECISION (integer_type_node))
6620 DECL_ARG_TYPE (parm) = integer_type_node;
6624 /* ??? Is it possible to get here with a
6625 built-in prototype or will it always have
6626 been diagnosed as conflicting with an
6627 old-style definition and discarded? */
6628 if (current_function_prototype_built_in)
6629 warning (0, "promoted argument %qD "
6630 "doesn%'t match built-in prototype", parm);
6633 pedwarn ("promoted argument %qD "
6634 "doesn%'t match prototype", parm);
6635 pedwarn ("%Hprototype declaration",
6636 ¤t_function_prototype_locus);
6642 if (current_function_prototype_built_in)
6643 warning (0, "argument %qD doesn%'t match "
6644 "built-in prototype", parm);
6647 error ("argument %qD doesn%'t match prototype", parm);
6648 error ("%Hprototype declaration",
6649 ¤t_function_prototype_locus);
6654 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6657 /* Otherwise, create a prototype that would match. */
6661 tree actual = 0, last = 0, type;
6663 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6665 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6667 TREE_CHAIN (last) = type;
6672 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6674 TREE_CHAIN (last) = type;
6678 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6679 of the type of this function, but we need to avoid having this
6680 affect the types of other similarly-typed functions, so we must
6681 first force the generation of an identical (but separate) type
6682 node for the relevant function type. The new node we create
6683 will be a variant of the main variant of the original function
6686 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
6688 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6692 /* Store parameter declarations passed in ARG_INFO into the current
6693 function declaration. */
6696 store_parm_decls_from (struct c_arg_info *arg_info)
6698 current_function_arg_info = arg_info;
6699 store_parm_decls ();
6702 /* Store the parameter declarations into the current function declaration.
6703 This is called after parsing the parameter declarations, before
6704 digesting the body of the function.
6706 For an old-style definition, construct a prototype out of the old-style
6707 parameter declarations and inject it into the function's type. */
6710 store_parm_decls (void)
6712 tree fndecl = current_function_decl;
6715 /* The argument information block for FNDECL. */
6716 struct c_arg_info *arg_info = current_function_arg_info;
6717 current_function_arg_info = 0;
6719 /* True if this definition is written with a prototype. Note:
6720 despite C99 6.7.5.3p14, we can *not* treat an empty argument
6721 list in a function definition as equivalent to (void) -- an
6722 empty argument list specifies the function has no parameters,
6723 but only (void) sets up a prototype for future calls. */
6724 proto = arg_info->types != 0;
6727 store_parm_decls_newstyle (fndecl, arg_info);
6729 store_parm_decls_oldstyle (fndecl, arg_info);
6731 /* The next call to push_scope will be a function body. */
6733 next_is_function_body = true;
6735 /* Write a record describing this function definition to the prototypes
6736 file (if requested). */
6738 gen_aux_info_record (fndecl, 1, 0, proto);
6740 /* Initialize the RTL code for the function. */
6741 allocate_struct_function (fndecl);
6743 /* Begin the statement tree for this function. */
6744 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
6746 /* ??? Insert the contents of the pending sizes list into the function
6747 to be evaluated. The only reason left to have this is
6748 void foo(int n, int array[n++])
6749 because we throw away the array type in favor of a pointer type, and
6750 thus won't naturally see the SAVE_EXPR containing the increment. All
6751 other pending sizes would be handled by gimplify_parameters. */
6754 for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t))
6755 add_stmt (TREE_VALUE (t));
6758 /* Even though we're inside a function body, we still don't want to
6759 call expand_expr to calculate the size of a variable-sized array.
6760 We haven't necessarily assigned RTL to all variables yet, so it's
6761 not safe to try to expand expressions involving them. */
6762 cfun->x_dont_save_pending_sizes_p = 1;
6765 /* Emit diagnostics that require gimple input for detection. Operate on
6766 FNDECL and all its nested functions. */
6769 c_gimple_diagnostics_recursively (tree fndecl)
6771 struct cgraph_node *cgn;
6773 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
6774 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
6776 /* Notice when OpenMP structured block constraints are violated. */
6778 diagnose_omp_structured_block_errors (fndecl);
6780 /* Finalize all nested functions now. */
6781 cgn = cgraph_node (fndecl);
6782 for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested)
6783 c_gimple_diagnostics_recursively (cgn->decl);
6786 /* Finish up a function declaration and compile that function
6787 all the way to assembler language output. The free the storage
6788 for the function definition.
6790 This is called after parsing the body of the function definition. */
6793 finish_function (void)
6795 tree fndecl = current_function_decl;
6797 label_context_stack_se = label_context_stack_se->next;
6798 label_context_stack_vm = label_context_stack_vm->next;
6800 if (TREE_CODE (fndecl) == FUNCTION_DECL
6801 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6803 tree args = DECL_ARGUMENTS (fndecl);
6804 for (; args; args = TREE_CHAIN (args))
6806 tree type = TREE_TYPE (args);
6807 if (INTEGRAL_TYPE_P (type)
6808 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6809 DECL_ARG_TYPE (args) = integer_type_node;
6813 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6814 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6816 /* Must mark the RESULT_DECL as being in this function. */
6818 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
6819 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6821 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6823 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6824 != integer_type_node)
6826 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6827 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6829 pedwarn ("return type of %q+D is not %<int%>", fndecl);
6835 tree stmt = c_finish_return (integer_zero_node);
6836 #ifdef USE_MAPPED_LOCATION
6837 /* Hack. We don't want the middle-end to warn that this return
6838 is unreachable, so we mark its location as special. Using
6839 UNKNOWN_LOCATION has the problem that it gets clobbered in
6840 annotate_one_with_locus. A cleaner solution might be to
6841 ensure ! should_carry_locus_p (stmt), but that needs a flag.
6843 SET_EXPR_LOCATION (stmt, BUILTINS_LOCATION);
6845 /* Hack. We don't want the middle-end to warn that this
6846 return is unreachable, so put the statement on the
6848 annotate_with_file_line (stmt, input_filename, 0);
6854 /* Tie off the statement tree for this function. */
6855 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
6857 finish_fname_decls ();
6859 /* Complain if there's just no return statement. */
6860 if (warn_return_type
6861 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6862 && !current_function_returns_value && !current_function_returns_null
6863 /* Don't complain if we are no-return. */
6864 && !current_function_returns_abnormally
6865 /* Don't warn for main(). */
6866 && !MAIN_NAME_P (DECL_NAME (fndecl))
6867 /* Or if they didn't actually specify a return type. */
6868 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6869 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6870 inline function, as we might never be compiled separately. */
6871 && DECL_INLINE (fndecl))
6873 warning (OPT_Wreturn_type,
6874 "no return statement in function returning non-void");
6875 TREE_NO_WARNING (fndecl) = 1;
6878 /* With just -Wextra, complain only if function returns both with
6879 and without a value. */
6881 && current_function_returns_value
6882 && current_function_returns_null)
6883 warning (OPT_Wextra, "this function may return with or without a value");
6885 /* Store the end of the function, so that we get good line number
6886 info for the epilogue. */
6887 cfun->function_end_locus = input_location;
6889 /* If we don't have ctors/dtors sections, and this is a static
6890 constructor or destructor, it must be recorded now. */
6891 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6892 && !targetm.have_ctors_dtors)
6893 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6894 if (DECL_STATIC_DESTRUCTOR (fndecl)
6895 && !targetm.have_ctors_dtors)
6896 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6898 /* Finalize the ELF visibility for the function. */
6899 c_determine_visibility (fndecl);
6901 /* Genericize before inlining. Delay genericizing nested functions
6902 until their parent function is genericized. Since finalizing
6903 requires GENERIC, delay that as well. */
6905 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node
6906 && !undef_nested_function)
6908 if (!decl_function_context (fndecl))
6910 c_genericize (fndecl);
6911 c_gimple_diagnostics_recursively (fndecl);
6913 /* ??? Objc emits functions after finalizing the compilation unit.
6914 This should be cleaned up later and this conditional removed. */
6915 if (cgraph_global_info_ready)
6917 c_expand_body (fndecl);
6921 cgraph_finalize_function (fndecl, false);
6925 /* Register this function with cgraph just far enough to get it
6926 added to our parent's nested function list. Handy, since the
6927 C front end doesn't have such a list. */
6928 (void) cgraph_node (fndecl);
6932 if (!decl_function_context (fndecl))
6933 undef_nested_function = false;
6935 /* We're leaving the context of this function, so zap cfun.
6936 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
6937 tree_rest_of_compilation. */
6939 current_function_decl = NULL;
6942 /* Generate the RTL for the body of FNDECL. */
6945 c_expand_body (tree fndecl)
6948 if (!DECL_INITIAL (fndecl)
6949 || DECL_INITIAL (fndecl) == error_mark_node)
6952 tree_rest_of_compilation (fndecl);
6954 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6955 && targetm.have_ctors_dtors)
6956 targetm.asm_out.constructor (XEXP (DECL_RTL (fndecl), 0),
6957 DEFAULT_INIT_PRIORITY);
6958 if (DECL_STATIC_DESTRUCTOR (fndecl)
6959 && targetm.have_ctors_dtors)
6960 targetm.asm_out.destructor (XEXP (DECL_RTL (fndecl), 0),
6961 DEFAULT_INIT_PRIORITY);
6964 /* Check the declarations given in a for-loop for satisfying the C99
6965 constraints. If exactly one such decl is found, return it. */
6968 check_for_loop_decls (void)
6970 struct c_binding *b;
6971 tree one_decl = NULL_TREE;
6977 /* If we get here, declarations have been used in a for loop without
6978 the C99 for loop scope. This doesn't make much sense, so don't
6980 error ("%<for%> loop initial declaration used outside C99 mode");
6983 /* C99 subclause 6.8.5 paragraph 3:
6985 [#3] The declaration part of a for statement shall only
6986 declare identifiers for objects having storage class auto or
6989 It isn't clear whether, in this sentence, "identifiers" binds to
6990 "shall only declare" or to "objects" - that is, whether all identifiers
6991 declared must be identifiers for objects, or whether the restriction
6992 only applies to those that are. (A question on this in comp.std.c
6993 in November 2000 received no answer.) We implement the strictest
6994 interpretation, to avoid creating an extension which later causes
6997 for (b = current_scope->bindings; b; b = b->prev)
7000 tree decl = b->decl;
7005 switch (TREE_CODE (decl))
7008 if (TREE_STATIC (decl))
7009 error ("declaration of static variable %q+D in %<for%> loop "
7010 "initial declaration", decl);
7011 else if (DECL_EXTERNAL (decl))
7012 error ("declaration of %<extern%> variable %q+D in %<for%> loop "
7013 "initial declaration", decl);
7017 error ("%<struct %E%> declared in %<for%> loop initial declaration",
7021 error ("%<union %E%> declared in %<for%> loop initial declaration",
7025 error ("%<enum %E%> declared in %<for%> loop initial declaration",
7029 error ("declaration of non-variable %q+D in %<for%> loop "
7030 "initial declaration", decl);
7037 return n_decls == 1 ? one_decl : NULL_TREE;
7040 /* Save and reinitialize the variables
7041 used during compilation of a C function. */
7044 c_push_function_context (struct function *f)
7046 struct language_function *p;
7047 p = GGC_NEW (struct language_function);
7050 p->base.x_stmt_tree = c_stmt_tree;
7051 p->x_break_label = c_break_label;
7052 p->x_cont_label = c_cont_label;
7053 p->x_switch_stack = c_switch_stack;
7054 p->arg_info = current_function_arg_info;
7055 p->returns_value = current_function_returns_value;
7056 p->returns_null = current_function_returns_null;
7057 p->returns_abnormally = current_function_returns_abnormally;
7058 p->warn_about_return_type = warn_about_return_type;
7061 /* Restore the variables used during compilation of a C function. */
7064 c_pop_function_context (struct function *f)
7066 struct language_function *p = f->language;
7068 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
7069 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
7071 /* Stop pointing to the local nodes about to be freed. */
7072 /* But DECL_INITIAL must remain nonzero so we know this
7073 was an actual function definition. */
7074 DECL_INITIAL (current_function_decl) = error_mark_node;
7075 DECL_ARGUMENTS (current_function_decl) = 0;
7078 c_stmt_tree = p->base.x_stmt_tree;
7079 c_break_label = p->x_break_label;
7080 c_cont_label = p->x_cont_label;
7081 c_switch_stack = p->x_switch_stack;
7082 current_function_arg_info = p->arg_info;
7083 current_function_returns_value = p->returns_value;
7084 current_function_returns_null = p->returns_null;
7085 current_function_returns_abnormally = p->returns_abnormally;
7086 warn_about_return_type = p->warn_about_return_type;
7091 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
7094 c_dup_lang_specific_decl (tree decl)
7096 struct lang_decl *ld;
7098 if (!DECL_LANG_SPECIFIC (decl))
7101 ld = GGC_NEW (struct lang_decl);
7102 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
7103 DECL_LANG_SPECIFIC (decl) = ld;
7106 /* The functions below are required for functionality of doing
7107 function at once processing in the C front end. Currently these
7108 functions are not called from anywhere in the C front end, but as
7109 these changes continue, that will change. */
7111 /* Returns the stmt_tree (if any) to which statements are currently
7112 being added. If there is no active statement-tree, NULL is
7116 current_stmt_tree (void)
7118 return &c_stmt_tree;
7121 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
7125 anon_aggr_type_p (tree ARG_UNUSED (node))
7130 /* Return the global value of T as a symbol. */
7133 identifier_global_value (tree t)
7135 struct c_binding *b;
7137 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
7138 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
7144 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
7145 otherwise the name is found in ridpointers from RID_INDEX. */
7148 record_builtin_type (enum rid rid_index, const char *name, tree type)
7152 id = ridpointers[(int) rid_index];
7154 id = get_identifier (name);
7155 decl = build_decl (TYPE_DECL, id, type);
7157 if (debug_hooks->type_decl)
7158 debug_hooks->type_decl (decl, false);
7161 /* Build the void_list_node (void_type_node having been created). */
7163 build_void_list_node (void)
7165 tree t = build_tree_list (NULL_TREE, void_type_node);
7169 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
7172 build_c_parm (struct c_declspecs *specs, tree attrs,
7173 struct c_declarator *declarator)
7175 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
7178 ret->declarator = declarator;
7182 /* Return a declarator with nested attributes. TARGET is the inner
7183 declarator to which these attributes apply. ATTRS are the
7186 struct c_declarator *
7187 build_attrs_declarator (tree attrs, struct c_declarator *target)
7189 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7190 ret->kind = cdk_attrs;
7191 ret->declarator = target;
7192 ret->u.attrs = attrs;
7196 /* Return a declarator for a function with arguments specified by ARGS
7197 and return type specified by TARGET. */
7199 struct c_declarator *
7200 build_function_declarator (struct c_arg_info *args,
7201 struct c_declarator *target)
7203 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7204 ret->kind = cdk_function;
7205 ret->declarator = target;
7206 ret->u.arg_info = args;
7210 /* Return a declarator for the identifier IDENT (which may be
7211 NULL_TREE for an abstract declarator). */
7213 struct c_declarator *
7214 build_id_declarator (tree ident)
7216 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7218 ret->declarator = 0;
7220 /* Default value - may get reset to a more precise location. */
7221 ret->id_loc = input_location;
7225 /* Return something to represent absolute declarators containing a *.
7226 TARGET is the absolute declarator that the * contains.
7227 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
7228 to apply to the pointer type. */
7230 struct c_declarator *
7231 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
7232 struct c_declarator *target)
7236 struct c_declarator *itarget = target;
7237 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7238 if (type_quals_attrs)
7240 attrs = type_quals_attrs->attrs;
7241 quals = quals_from_declspecs (type_quals_attrs);
7242 if (attrs != NULL_TREE)
7243 itarget = build_attrs_declarator (attrs, target);
7245 ret->kind = cdk_pointer;
7246 ret->declarator = itarget;
7247 ret->u.pointer_quals = quals;
7251 /* Return a pointer to a structure for an empty list of declaration
7254 struct c_declspecs *
7255 build_null_declspecs (void)
7257 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
7261 ret->typespec_word = cts_none;
7262 ret->storage_class = csc_none;
7263 ret->declspecs_seen_p = false;
7264 ret->type_seen_p = false;
7265 ret->non_sc_seen_p = false;
7266 ret->typedef_p = false;
7267 ret->tag_defined_p = false;
7268 ret->explicit_signed_p = false;
7269 ret->deprecated_p = false;
7270 ret->default_int_p = false;
7271 ret->long_p = false;
7272 ret->long_long_p = false;
7273 ret->short_p = false;
7274 ret->signed_p = false;
7275 ret->unsigned_p = false;
7276 ret->complex_p = false;
7277 ret->inline_p = false;
7278 ret->thread_p = false;
7279 ret->const_p = false;
7280 ret->volatile_p = false;
7281 ret->restrict_p = false;
7285 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
7288 struct c_declspecs *
7289 declspecs_add_qual (struct c_declspecs *specs, tree qual)
7293 specs->non_sc_seen_p = true;
7294 specs->declspecs_seen_p = true;
7295 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
7296 && C_IS_RESERVED_WORD (qual));
7297 i = C_RID_CODE (qual);
7301 dupe = specs->const_p;
7302 specs->const_p = true;
7305 dupe = specs->volatile_p;
7306 specs->volatile_p = true;
7309 dupe = specs->restrict_p;
7310 specs->restrict_p = true;
7315 if (dupe && pedantic && !flag_isoc99)
7316 pedwarn ("duplicate %qE", qual);
7320 /* Add the type specifier TYPE to the declaration specifiers SPECS,
7323 struct c_declspecs *
7324 declspecs_add_type (struct c_declspecs *specs, struct c_typespec spec)
7326 tree type = spec.spec;
7327 specs->non_sc_seen_p = true;
7328 specs->declspecs_seen_p = true;
7329 specs->type_seen_p = true;
7330 if (TREE_DEPRECATED (type))
7331 specs->deprecated_p = true;
7333 /* Handle type specifier keywords. */
7334 if (TREE_CODE (type) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (type))
7336 enum rid i = C_RID_CODE (type);
7339 error ("two or more data types in declaration specifiers");
7342 if ((int) i <= (int) RID_LAST_MODIFIER)
7344 /* "long", "short", "signed", "unsigned" or "_Complex". */
7349 if (specs->long_long_p)
7351 error ("%<long long long%> is too long for GCC");
7356 if (specs->typespec_word == cts_double)
7358 error ("both %<long long%> and %<double%> in "
7359 "declaration specifiers");
7362 if (pedantic && !flag_isoc99 && !in_system_header
7364 pedwarn ("ISO C90 does not support %<long long%>");
7365 specs->long_long_p = 1;
7369 error ("both %<long%> and %<short%> in "
7370 "declaration specifiers");
7371 else if (specs->typespec_word == cts_void)
7372 error ("both %<long%> and %<void%> in "
7373 "declaration specifiers");
7374 else if (specs->typespec_word == cts_bool)
7375 error ("both %<long%> and %<_Bool%> in "
7376 "declaration specifiers");
7377 else if (specs->typespec_word == cts_char)
7378 error ("both %<long%> and %<char%> in "
7379 "declaration specifiers");
7380 else if (specs->typespec_word == cts_float)
7381 error ("both %<long%> and %<float%> in "
7382 "declaration specifiers");
7383 else if (specs->typespec_word == cts_dfloat32)
7384 error ("both %<long%> and %<_Decimal32%> in "
7385 "declaration specifiers");
7386 else if (specs->typespec_word == cts_dfloat64)
7387 error ("both %<long%> and %<_Decimal64%> in "
7388 "declaration specifiers");
7389 else if (specs->typespec_word == cts_dfloat128)
7390 error ("both %<long%> and %<_Decimal128%> in "
7391 "declaration specifiers");
7393 specs->long_p = true;
7396 dupe = specs->short_p;
7398 error ("both %<long%> and %<short%> in "
7399 "declaration specifiers");
7400 else if (specs->typespec_word == cts_void)
7401 error ("both %<short%> and %<void%> in "
7402 "declaration specifiers");
7403 else if (specs->typespec_word == cts_bool)
7404 error ("both %<short%> and %<_Bool%> in "
7405 "declaration specifiers");
7406 else if (specs->typespec_word == cts_char)
7407 error ("both %<short%> and %<char%> in "
7408 "declaration specifiers");
7409 else if (specs->typespec_word == cts_float)
7410 error ("both %<short%> and %<float%> in "
7411 "declaration specifiers");
7412 else if (specs->typespec_word == cts_double)
7413 error ("both %<short%> and %<double%> in "
7414 "declaration specifiers");
7415 else if (specs->typespec_word == cts_dfloat32)
7416 error ("both %<short%> and %<_Decimal32%> in "
7417 "declaration specifiers");
7418 else if (specs->typespec_word == cts_dfloat64)
7419 error ("both %<short%> and %<_Decimal64%> in "
7420 "declaration specifiers");
7421 else if (specs->typespec_word == cts_dfloat128)
7422 error ("both %<short%> and %<_Decimal128%> in "
7423 "declaration specifiers");
7425 specs->short_p = true;
7428 dupe = specs->signed_p;
7429 if (specs->unsigned_p)
7430 error ("both %<signed%> and %<unsigned%> in "
7431 "declaration specifiers");
7432 else if (specs->typespec_word == cts_void)
7433 error ("both %<signed%> and %<void%> in "
7434 "declaration specifiers");
7435 else if (specs->typespec_word == cts_bool)
7436 error ("both %<signed%> and %<_Bool%> in "
7437 "declaration specifiers");
7438 else if (specs->typespec_word == cts_float)
7439 error ("both %<signed%> and %<float%> in "
7440 "declaration specifiers");
7441 else if (specs->typespec_word == cts_double)
7442 error ("both %<signed%> and %<double%> in "
7443 "declaration specifiers");
7444 else if (specs->typespec_word == cts_dfloat32)
7445 error ("both %<signed%> and %<_Decimal32%> in "
7446 "declaration specifiers");
7447 else if (specs->typespec_word == cts_dfloat64)
7448 error ("both %<signed%> and %<_Decimal64%> in "
7449 "declaration specifiers");
7450 else if (specs->typespec_word == cts_dfloat128)
7451 error ("both %<signed%> and %<_Decimal128%> in "
7452 "declaration specifiers");
7454 specs->signed_p = true;
7457 dupe = specs->unsigned_p;
7458 if (specs->signed_p)
7459 error ("both %<signed%> and %<unsigned%> in "
7460 "declaration specifiers");
7461 else if (specs->typespec_word == cts_void)
7462 error ("both %<unsigned%> and %<void%> in "
7463 "declaration specifiers");
7464 else if (specs->typespec_word == cts_bool)
7465 error ("both %<unsigned%> and %<_Bool%> in "
7466 "declaration specifiers");
7467 else if (specs->typespec_word == cts_float)
7468 error ("both %<unsigned%> and %<float%> in "
7469 "declaration specifiers");
7470 else if (specs->typespec_word == cts_double)
7471 error ("both %<unsigned%> and %<double%> in "
7472 "declaration specifiers");
7473 else if (specs->typespec_word == cts_dfloat32)
7474 error ("both %<unsigned%> and %<_Decimal32%> in "
7475 "declaration specifiers");
7476 else if (specs->typespec_word == cts_dfloat64)
7477 error ("both %<unsigned%> and %<_Decimal64%> in "
7478 "declaration specifiers");
7479 else if (specs->typespec_word == cts_dfloat128)
7480 error ("both %<unsigned%> and %<_Decimal128%> in "
7481 "declaration specifiers");
7483 specs->unsigned_p = true;
7486 dupe = specs->complex_p;
7487 if (pedantic && !flag_isoc99 && !in_system_header)
7488 pedwarn ("ISO C90 does not support complex types");
7489 if (specs->typespec_word == cts_void)
7490 error ("both %<complex%> and %<void%> in "
7491 "declaration specifiers");
7492 else if (specs->typespec_word == cts_bool)
7493 error ("both %<complex%> and %<_Bool%> in "
7494 "declaration specifiers");
7495 else if (specs->typespec_word == cts_dfloat32)
7496 error ("both %<complex%> and %<_Decimal32%> in "
7497 "declaration specifiers");
7498 else if (specs->typespec_word == cts_dfloat64)
7499 error ("both %<complex%> and %<_Decimal64%> in "
7500 "declaration specifiers");
7501 else if (specs->typespec_word == cts_dfloat128)
7502 error ("both %<complex%> and %<_Decimal128%> in "
7503 "declaration specifiers");
7505 specs->complex_p = true;
7512 error ("duplicate %qE", type);
7518 /* "void", "_Bool", "char", "int", "float" or "double". */
7519 if (specs->typespec_word != cts_none)
7521 error ("two or more data types in declaration specifiers");
7528 error ("both %<long%> and %<void%> in "
7529 "declaration specifiers");
7530 else if (specs->short_p)
7531 error ("both %<short%> and %<void%> in "
7532 "declaration specifiers");
7533 else if (specs->signed_p)
7534 error ("both %<signed%> and %<void%> in "
7535 "declaration specifiers");
7536 else if (specs->unsigned_p)
7537 error ("both %<unsigned%> and %<void%> in "
7538 "declaration specifiers");
7539 else if (specs->complex_p)
7540 error ("both %<complex%> and %<void%> in "
7541 "declaration specifiers");
7543 specs->typespec_word = cts_void;
7547 error ("both %<long%> and %<_Bool%> in "
7548 "declaration specifiers");
7549 else if (specs->short_p)
7550 error ("both %<short%> and %<_Bool%> in "
7551 "declaration specifiers");
7552 else if (specs->signed_p)
7553 error ("both %<signed%> and %<_Bool%> in "
7554 "declaration specifiers");
7555 else if (specs->unsigned_p)
7556 error ("both %<unsigned%> and %<_Bool%> in "
7557 "declaration specifiers");
7558 else if (specs->complex_p)
7559 error ("both %<complex%> and %<_Bool%> in "
7560 "declaration specifiers");
7562 specs->typespec_word = cts_bool;
7566 error ("both %<long%> and %<char%> in "
7567 "declaration specifiers");
7568 else if (specs->short_p)
7569 error ("both %<short%> and %<char%> in "
7570 "declaration specifiers");
7572 specs->typespec_word = cts_char;
7575 specs->typespec_word = cts_int;
7579 error ("both %<long%> and %<float%> in "
7580 "declaration specifiers");
7581 else if (specs->short_p)
7582 error ("both %<short%> and %<float%> in "
7583 "declaration specifiers");
7584 else if (specs->signed_p)
7585 error ("both %<signed%> and %<float%> in "
7586 "declaration specifiers");
7587 else if (specs->unsigned_p)
7588 error ("both %<unsigned%> and %<float%> in "
7589 "declaration specifiers");
7591 specs->typespec_word = cts_float;
7594 if (specs->long_long_p)
7595 error ("both %<long long%> and %<double%> in "
7596 "declaration specifiers");
7597 else if (specs->short_p)
7598 error ("both %<short%> and %<double%> in "
7599 "declaration specifiers");
7600 else if (specs->signed_p)
7601 error ("both %<signed%> and %<double%> in "
7602 "declaration specifiers");
7603 else if (specs->unsigned_p)
7604 error ("both %<unsigned%> and %<double%> in "
7605 "declaration specifiers");
7607 specs->typespec_word = cts_double;
7614 if (i == RID_DFLOAT32)
7616 else if (i == RID_DFLOAT64)
7619 str = "_Decimal128";
7620 if (specs->long_long_p)
7621 error ("both %<long long%> and %<%s%> in "
7622 "declaration specifiers", str);
7624 error ("both %<long%> and %<%s%> in "
7625 "declaration specifiers", str);
7626 else if (specs->short_p)
7627 error ("both %<short%> and %<%s%> in "
7628 "declaration specifiers", str);
7629 else if (specs->signed_p)
7630 error ("both %<signed%> and %<%s%> in "
7631 "declaration specifiers", str);
7632 else if (specs->unsigned_p)
7633 error ("both %<unsigned%> and %<%s%> in "
7634 "declaration specifiers", str);
7635 else if (specs->complex_p)
7636 error ("both %<complex%> and %<%s%> in "
7637 "declaration specifiers", str);
7638 else if (i == RID_DFLOAT32)
7639 specs->typespec_word = cts_dfloat32;
7640 else if (i == RID_DFLOAT64)
7641 specs->typespec_word = cts_dfloat64;
7643 specs->typespec_word = cts_dfloat128;
7645 if (!targetm.decimal_float_supported_p ())
7646 error ("decimal floating point not supported for this target");
7648 pedwarn ("ISO C does not support decimal floating point");
7651 /* ObjC reserved word "id", handled below. */
7657 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
7658 form of ObjC type, cases such as "int" and "long" being handled
7659 above), a TYPE (struct, union, enum and typeof specifiers) or an
7660 ERROR_MARK. In none of these cases may there have previously
7661 been any type specifiers. */
7662 if (specs->type || specs->typespec_word != cts_none
7663 || specs->long_p || specs->short_p || specs->signed_p
7664 || specs->unsigned_p || specs->complex_p)
7665 error ("two or more data types in declaration specifiers");
7666 else if (TREE_CODE (type) == TYPE_DECL)
7668 if (TREE_TYPE (type) == error_mark_node)
7669 ; /* Allow the type to default to int to avoid cascading errors. */
7672 specs->type = TREE_TYPE (type);
7673 specs->decl_attr = DECL_ATTRIBUTES (type);
7674 specs->typedef_p = true;
7675 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
7678 else if (TREE_CODE (type) == IDENTIFIER_NODE)
7680 tree t = lookup_name (type);
7681 if (!t || TREE_CODE (t) != TYPE_DECL)
7682 error ("%qE fails to be a typedef or built in type", type);
7683 else if (TREE_TYPE (t) == error_mark_node)
7686 specs->type = TREE_TYPE (t);
7688 else if (TREE_CODE (type) != ERROR_MARK)
7690 if (spec.kind == ctsk_tagdef || spec.kind == ctsk_tagfirstref)
7691 specs->tag_defined_p = true;
7692 if (spec.kind == ctsk_typeof)
7693 specs->typedef_p = true;
7700 /* Add the storage class specifier or function specifier SCSPEC to the
7701 declaration specifiers SPECS, returning SPECS. */
7703 struct c_declspecs *
7704 declspecs_add_scspec (struct c_declspecs *specs, tree scspec)
7707 enum c_storage_class n = csc_none;
7709 specs->declspecs_seen_p = true;
7710 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
7711 && C_IS_RESERVED_WORD (scspec));
7712 i = C_RID_CODE (scspec);
7713 if (extra_warnings && specs->non_sc_seen_p)
7714 warning (OPT_Wextra, "%qE is not at beginning of declaration", scspec);
7718 /* C99 permits duplicate inline. Although of doubtful utility,
7719 it seems simplest to permit it in gnu89 mode as well, as
7720 there is also little utility in maintaining this as a
7721 difference between gnu89 and C99 inline. */
7723 specs->inline_p = true;
7726 dupe = specs->thread_p;
7727 if (specs->storage_class == csc_auto)
7728 error ("%<__thread%> used with %<auto%>");
7729 else if (specs->storage_class == csc_register)
7730 error ("%<__thread%> used with %<register%>");
7731 else if (specs->storage_class == csc_typedef)
7732 error ("%<__thread%> used with %<typedef%>");
7734 specs->thread_p = true;
7741 /* Diagnose "__thread extern". */
7742 if (specs->thread_p)
7743 error ("%<__thread%> before %<extern%>");
7750 /* Diagnose "__thread static". */
7751 if (specs->thread_p)
7752 error ("%<__thread%> before %<static%>");
7760 if (n != csc_none && n == specs->storage_class)
7763 error ("duplicate %qE", scspec);
7766 if (specs->storage_class != csc_none && n != specs->storage_class)
7768 error ("multiple storage classes in declaration specifiers");
7772 specs->storage_class = n;
7773 if (n != csc_extern && n != csc_static && specs->thread_p)
7775 error ("%<__thread%> used with %qE", scspec);
7776 specs->thread_p = false;
7783 /* Add the attributes ATTRS to the declaration specifiers SPECS,
7786 struct c_declspecs *
7787 declspecs_add_attrs (struct c_declspecs *specs, tree attrs)
7789 specs->attrs = chainon (attrs, specs->attrs);
7790 specs->declspecs_seen_p = true;
7794 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
7795 specifiers with any other type specifier to determine the resulting
7796 type. This is where ISO C checks on complex types are made, since
7797 "_Complex long" is a prefix of the valid ISO C type "_Complex long
7800 struct c_declspecs *
7801 finish_declspecs (struct c_declspecs *specs)
7803 /* If a type was specified as a whole, we have no modifiers and are
7805 if (specs->type != NULL_TREE)
7807 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
7808 && !specs->signed_p && !specs->unsigned_p
7809 && !specs->complex_p);
7813 /* If none of "void", "_Bool", "char", "int", "float" or "double"
7814 has been specified, treat it as "int" unless "_Complex" is
7815 present and there are no other specifiers. If we just have
7816 "_Complex", it is equivalent to "_Complex double", but e.g.
7817 "_Complex short" is equivalent to "_Complex short int". */
7818 if (specs->typespec_word == cts_none)
7820 if (specs->long_p || specs->short_p
7821 || specs->signed_p || specs->unsigned_p)
7823 specs->typespec_word = cts_int;
7825 else if (specs->complex_p)
7827 specs->typespec_word = cts_double;
7829 pedwarn ("ISO C does not support plain %<complex%> meaning "
7830 "%<double complex%>");
7834 specs->typespec_word = cts_int;
7835 specs->default_int_p = true;
7836 /* We don't diagnose this here because grokdeclarator will
7837 give more specific diagnostics according to whether it is
7838 a function definition. */
7842 /* If "signed" was specified, record this to distinguish "int" and
7843 "signed int" in the case of a bit-field with
7844 -funsigned-bitfields. */
7845 specs->explicit_signed_p = specs->signed_p;
7847 /* Now compute the actual type. */
7848 switch (specs->typespec_word)
7851 gcc_assert (!specs->long_p && !specs->short_p
7852 && !specs->signed_p && !specs->unsigned_p
7853 && !specs->complex_p);
7854 specs->type = void_type_node;
7857 gcc_assert (!specs->long_p && !specs->short_p
7858 && !specs->signed_p && !specs->unsigned_p
7859 && !specs->complex_p);
7860 specs->type = boolean_type_node;
7863 gcc_assert (!specs->long_p && !specs->short_p);
7864 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7865 if (specs->signed_p)
7866 specs->type = signed_char_type_node;
7867 else if (specs->unsigned_p)
7868 specs->type = unsigned_char_type_node;
7870 specs->type = char_type_node;
7871 if (specs->complex_p)
7874 pedwarn ("ISO C does not support complex integer types");
7875 specs->type = build_complex_type (specs->type);
7879 gcc_assert (!(specs->long_p && specs->short_p));
7880 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7881 if (specs->long_long_p)
7882 specs->type = (specs->unsigned_p
7883 ? long_long_unsigned_type_node
7884 : long_long_integer_type_node);
7885 else if (specs->long_p)
7886 specs->type = (specs->unsigned_p
7887 ? long_unsigned_type_node
7888 : long_integer_type_node);
7889 else if (specs->short_p)
7890 specs->type = (specs->unsigned_p
7891 ? short_unsigned_type_node
7892 : short_integer_type_node);
7894 specs->type = (specs->unsigned_p
7895 ? unsigned_type_node
7896 : integer_type_node);
7897 if (specs->complex_p)
7900 pedwarn ("ISO C does not support complex integer types");
7901 specs->type = build_complex_type (specs->type);
7905 gcc_assert (!specs->long_p && !specs->short_p
7906 && !specs->signed_p && !specs->unsigned_p);
7907 specs->type = (specs->complex_p
7908 ? complex_float_type_node
7912 gcc_assert (!specs->long_long_p && !specs->short_p
7913 && !specs->signed_p && !specs->unsigned_p);
7916 specs->type = (specs->complex_p
7917 ? complex_long_double_type_node
7918 : long_double_type_node);
7922 specs->type = (specs->complex_p
7923 ? complex_double_type_node
7924 : double_type_node);
7930 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
7931 && !specs->signed_p && !specs->unsigned_p && !specs->complex_p);
7932 if (specs->typespec_word == cts_dfloat32)
7933 specs->type = dfloat32_type_node;
7934 else if (specs->typespec_word == cts_dfloat64)
7935 specs->type = dfloat64_type_node;
7937 specs->type = dfloat128_type_node;
7946 /* Synthesize a function which calls all the global ctors or global
7947 dtors in this file. This is only used for targets which do not
7948 support .ctors/.dtors sections. FIXME: Migrate into cgraph. */
7950 build_cdtor (int method_type, tree cdtors)
7957 for (; cdtors; cdtors = TREE_CHAIN (cdtors))
7958 append_to_statement_list (build_function_call (TREE_VALUE (cdtors), 0),
7961 cgraph_build_static_cdtor (method_type, body, DEFAULT_INIT_PRIORITY);
7964 /* A subroutine of c_write_global_declarations. Perform final processing
7965 on one file scope's declarations (or the external scope's declarations),
7969 c_write_global_declarations_1 (tree globals)
7974 /* Process the decls in the order they were written. */
7975 for (decl = globals; decl; decl = TREE_CHAIN (decl))
7977 /* Check for used but undefined static functions using the C
7978 standard's definition of "used", and set TREE_NO_WARNING so
7979 that check_global_declarations doesn't repeat the check. */
7980 if (TREE_CODE (decl) == FUNCTION_DECL
7981 && DECL_INITIAL (decl) == 0
7982 && DECL_EXTERNAL (decl)
7983 && !TREE_PUBLIC (decl)
7984 && C_DECL_USED (decl))
7986 pedwarn ("%q+F used but never defined", decl);
7987 TREE_NO_WARNING (decl) = 1;
7990 wrapup_global_declaration_1 (decl);
7996 for (decl = globals; decl; decl = TREE_CHAIN (decl))
7997 reconsider |= wrapup_global_declaration_2 (decl);
8001 for (decl = globals; decl; decl = TREE_CHAIN (decl))
8002 check_global_declaration_1 (decl);
8005 /* A subroutine of c_write_global_declarations Emit debug information for each
8006 of the declarations in GLOBALS. */
8009 c_write_global_declarations_2 (tree globals)
8013 for (decl = globals; decl ; decl = TREE_CHAIN (decl))
8014 debug_hooks->global_decl (decl);
8017 /* Preserve the external declarations scope across a garbage collect. */
8018 static GTY(()) tree ext_block;
8021 c_write_global_declarations (void)
8025 /* We don't want to do this if generating a PCH. */
8029 /* Don't waste time on further processing if -fsyntax-only or we've
8030 encountered errors. */
8031 if (flag_syntax_only || errorcount || sorrycount || cpp_errors (parse_in))
8034 /* Close the external scope. */
8035 ext_block = pop_scope ();
8037 gcc_assert (!current_scope);
8041 tree tmp = BLOCK_VARS (ext_block);
8043 FILE * stream = dump_begin (TDI_tu, &flags);
8046 dump_node (tmp, flags & ~TDF_SLIM, stream);
8047 dump_end (TDI_tu, stream);
8051 /* Process all file scopes in this compilation, and the external_scope,
8052 through wrapup_global_declarations and check_global_declarations. */
8053 for (t = all_translation_units; t; t = TREE_CHAIN (t))
8054 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
8055 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
8057 /* Generate functions to call static constructors and destructors
8058 for targets that do not support .ctors/.dtors sections. These
8059 functions have magic names which are detected by collect2. */
8060 build_cdtor ('I', static_ctors); static_ctors = 0;
8061 build_cdtor ('D', static_dtors); static_dtors = 0;
8063 /* We're done parsing; proceed to optimize and emit assembly.
8064 FIXME: shouldn't be the front end's responsibility to call this. */
8067 /* After cgraph has had a chance to emit everything that's going to
8068 be emitted, output debug information for globals. */
8069 if (errorcount == 0 && sorrycount == 0)
8071 timevar_push (TV_SYMOUT);
8072 for (t = all_translation_units; t; t = TREE_CHAIN (t))
8073 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t)));
8074 c_write_global_declarations_2 (BLOCK_VARS (ext_block));
8075 timevar_pop (TV_SYMOUT);
8081 #include "gt-c-decl.h"