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 (TREE_CODE (olddecl) != FUNCTION_DECL)
1694 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1696 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1697 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1702 /* Merge the type qualifiers. */
1703 if (TREE_READONLY (newdecl))
1704 TREE_READONLY (olddecl) = 1;
1706 if (TREE_THIS_VOLATILE (newdecl))
1707 TREE_THIS_VOLATILE (olddecl) = 1;
1709 /* Merge deprecatedness. */
1710 if (TREE_DEPRECATED (newdecl))
1711 TREE_DEPRECATED (olddecl) = 1;
1713 /* Keep source location of definition rather than declaration and of
1714 prototype rather than non-prototype unless that prototype is
1716 if ((DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1717 || (old_is_prototype && !new_is_prototype
1718 && !C_DECL_BUILTIN_PROTOTYPE (olddecl)))
1719 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1721 /* Merge the initialization information. */
1722 if (DECL_INITIAL (newdecl) == 0)
1723 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1725 /* Merge the threadprivate attribute. */
1726 if (TREE_CODE (olddecl) == VAR_DECL && C_DECL_THREADPRIVATE_P (olddecl))
1728 DECL_TLS_MODEL (newdecl) = DECL_TLS_MODEL (olddecl);
1729 C_DECL_THREADPRIVATE_P (newdecl) = 1;
1732 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl), TS_DECL_WITH_VIS))
1734 /* Merge the unused-warning information. */
1735 if (DECL_IN_SYSTEM_HEADER (olddecl))
1736 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1737 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1738 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1740 /* Merge the section attribute.
1741 We want to issue an error if the sections conflict but that
1742 must be done later in decl_attributes since we are called
1743 before attributes are assigned. */
1744 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1745 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1747 /* Copy the assembler name.
1748 Currently, it can only be defined in the prototype. */
1749 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1751 /* Use visibility of whichever declaration had it specified */
1752 if (DECL_VISIBILITY_SPECIFIED (olddecl))
1754 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1755 DECL_VISIBILITY_SPECIFIED (newdecl) = 1;
1758 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1760 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1761 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1762 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1763 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1764 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1765 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1766 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1767 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1768 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1769 DECL_IS_NOVOPS (newdecl) |= DECL_IS_NOVOPS (olddecl);
1772 /* Merge the storage class information. */
1773 merge_weak (newdecl, olddecl);
1775 /* For functions, static overrides non-static. */
1776 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1778 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1779 /* This is since we don't automatically
1780 copy the attributes of NEWDECL into OLDDECL. */
1781 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1782 /* If this clears `static', clear it in the identifier too. */
1783 if (!TREE_PUBLIC (olddecl))
1784 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1788 /* In c99, 'extern' declaration before (or after) 'inline' means this
1789 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
1791 if (TREE_CODE (newdecl) == FUNCTION_DECL
1792 && !flag_gnu89_inline
1793 && (DECL_DECLARED_INLINE_P (newdecl)
1794 || DECL_DECLARED_INLINE_P (olddecl))
1795 && (!DECL_DECLARED_INLINE_P (newdecl)
1796 || !DECL_DECLARED_INLINE_P (olddecl)
1797 || !DECL_EXTERNAL (olddecl))
1798 && DECL_EXTERNAL (newdecl)
1799 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl)))
1800 DECL_EXTERNAL (newdecl) = 0;
1802 if (DECL_EXTERNAL (newdecl))
1804 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1805 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1807 /* An extern decl does not override previous storage class. */
1808 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1809 if (!DECL_EXTERNAL (newdecl))
1811 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1812 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1817 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1818 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1821 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1823 /* If we're redefining a function previously defined as extern
1824 inline, make sure we emit debug info for the inline before we
1825 throw it away, in case it was inlined into a function that
1826 hasn't been written out yet. */
1827 if (new_is_definition && DECL_INITIAL (olddecl))
1829 if (TREE_USED (olddecl)
1830 /* In unit-at-a-time mode we never inline re-defined extern
1831 inline functions. */
1832 && !flag_unit_at_a_time
1833 && cgraph_function_possibly_inlined_p (olddecl))
1834 (*debug_hooks->outlining_inline_function) (olddecl);
1836 /* The new defn must not be inline. */
1837 DECL_INLINE (newdecl) = 0;
1838 DECL_UNINLINABLE (newdecl) = 1;
1842 /* If either decl says `inline', this fn is inline, unless
1843 its definition was passed already. */
1844 if (DECL_DECLARED_INLINE_P (newdecl)
1845 || DECL_DECLARED_INLINE_P (olddecl))
1846 DECL_DECLARED_INLINE_P (newdecl) = 1;
1848 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1849 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1852 if (DECL_BUILT_IN (olddecl))
1854 /* If redeclaring a builtin function, it stays built in.
1855 But it gets tagged as having been declared. */
1856 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1857 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1858 C_DECL_DECLARED_BUILTIN (newdecl) = 1;
1859 if (new_is_prototype)
1860 C_DECL_BUILTIN_PROTOTYPE (newdecl) = 0;
1862 C_DECL_BUILTIN_PROTOTYPE (newdecl)
1863 = C_DECL_BUILTIN_PROTOTYPE (olddecl);
1866 /* Also preserve various other info from the definition. */
1867 if (!new_is_definition)
1869 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1870 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1871 DECL_STRUCT_FUNCTION (newdecl) = DECL_STRUCT_FUNCTION (olddecl);
1872 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1873 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1875 /* Set DECL_INLINE on the declaration if we've got a body
1876 from which to instantiate. */
1877 if (DECL_INLINE (olddecl) && !DECL_UNINLINABLE (newdecl))
1879 DECL_INLINE (newdecl) = 1;
1880 DECL_ABSTRACT_ORIGIN (newdecl)
1881 = DECL_ABSTRACT_ORIGIN (olddecl);
1886 /* If a previous declaration said inline, mark the
1887 definition as inlinable. */
1888 if (DECL_DECLARED_INLINE_P (newdecl)
1889 && !DECL_UNINLINABLE (newdecl))
1890 DECL_INLINE (newdecl) = 1;
1894 extern_changed = DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl);
1896 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1897 But preserve OLDDECL's DECL_UID and DECL_CONTEXT. */
1899 unsigned olddecl_uid = DECL_UID (olddecl);
1900 tree olddecl_context = DECL_CONTEXT (olddecl);
1902 memcpy ((char *) olddecl + sizeof (struct tree_common),
1903 (char *) newdecl + sizeof (struct tree_common),
1904 sizeof (struct tree_decl_common) - sizeof (struct tree_common));
1905 switch (TREE_CODE (olddecl))
1915 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1916 (char *) newdecl + sizeof (struct tree_decl_common),
1917 tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common));
1922 memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
1923 (char *) newdecl + sizeof (struct tree_decl_common),
1924 sizeof (struct tree_decl_non_common) - sizeof (struct tree_decl_common));
1926 DECL_UID (olddecl) = olddecl_uid;
1927 DECL_CONTEXT (olddecl) = olddecl_context;
1930 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1931 so that encode_section_info has a chance to look at the new decl
1932 flags and attributes. */
1933 if (DECL_RTL_SET_P (olddecl)
1934 && (TREE_CODE (olddecl) == FUNCTION_DECL
1935 || (TREE_CODE (olddecl) == VAR_DECL
1936 && TREE_STATIC (olddecl))))
1937 make_decl_rtl (olddecl);
1939 /* If we changed a function from DECL_EXTERNAL to !DECL_EXTERNAL,
1940 and the definition is coming from the old version, cgraph needs
1941 to be called again. */
1942 if (extern_changed && !new_is_definition
1943 && TREE_CODE (olddecl) == FUNCTION_DECL && DECL_INITIAL (olddecl))
1944 cgraph_finalize_function (olddecl, false);
1947 /* Handle when a new declaration NEWDECL has the same name as an old
1948 one OLDDECL in the same binding contour. Prints an error message
1951 If safely possible, alter OLDDECL to look like NEWDECL, and return
1952 true. Otherwise, return false. */
1955 duplicate_decls (tree newdecl, tree olddecl)
1957 tree newtype = NULL, oldtype = NULL;
1959 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
1961 /* Avoid `unused variable' and other warnings warnings for OLDDECL. */
1962 TREE_NO_WARNING (olddecl) = 1;
1966 merge_decls (newdecl, olddecl, newtype, oldtype);
1971 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
1973 warn_if_shadowing (tree new_decl)
1975 struct c_binding *b;
1977 /* Shadow warnings wanted? */
1979 /* No shadow warnings for internally generated vars. */
1980 || DECL_IS_BUILTIN (new_decl)
1981 /* No shadow warnings for vars made for inlining. */
1982 || DECL_FROM_INLINE (new_decl))
1985 /* Is anything being shadowed? Invisible decls do not count. */
1986 for (b = I_SYMBOL_BINDING (DECL_NAME (new_decl)); b; b = b->shadowed)
1987 if (b->decl && b->decl != new_decl && !b->invisible)
1989 tree old_decl = b->decl;
1991 if (old_decl == error_mark_node)
1993 warning (OPT_Wshadow, "declaration of %q+D shadows previous "
1994 "non-variable", new_decl);
1997 else if (TREE_CODE (old_decl) == PARM_DECL)
1998 warning (OPT_Wshadow, "declaration of %q+D shadows a parameter",
2000 else if (DECL_FILE_SCOPE_P (old_decl))
2001 warning (OPT_Wshadow, "declaration of %q+D shadows a global "
2002 "declaration", new_decl);
2003 else if (TREE_CODE (old_decl) == FUNCTION_DECL
2004 && DECL_BUILT_IN (old_decl))
2006 warning (OPT_Wshadow, "declaration of %q+D shadows "
2007 "a built-in function", new_decl);
2011 warning (OPT_Wshadow, "declaration of %q+D shadows a previous local",
2014 warning (OPT_Wshadow, "%Jshadowed declaration is here", old_decl);
2021 /* Subroutine of pushdecl.
2023 X is a TYPE_DECL for a typedef statement. Create a brand new
2024 ..._TYPE node (which will be just a variant of the existing
2025 ..._TYPE node with identical properties) and then install X
2026 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2028 The whole point here is to end up with a situation where each
2029 and every ..._TYPE node the compiler creates will be uniquely
2030 associated with AT MOST one node representing a typedef name.
2031 This way, even though the compiler substitutes corresponding
2032 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2033 early on, later parts of the compiler can always do the reverse
2034 translation and get back the corresponding typedef name. For
2037 typedef struct S MY_TYPE;
2040 Later parts of the compiler might only know that `object' was of
2041 type `struct S' if it were not for code just below. With this
2042 code however, later parts of the compiler see something like:
2044 struct S' == struct S
2045 typedef struct S' MY_TYPE;
2048 And they can then deduce (from the node for type struct S') that
2049 the original object declaration was:
2053 Being able to do this is important for proper support of protoize,
2054 and also for generating precise symbolic debugging information
2055 which takes full account of the programmer's (typedef) vocabulary.
2057 Obviously, we don't want to generate a duplicate ..._TYPE node if
2058 the TYPE_DECL node that we are now processing really represents a
2059 standard built-in type.
2061 Since all standard types are effectively declared at line zero
2062 in the source file, we can easily check to see if we are working
2063 on a standard type by checking the current value of lineno. */
2066 clone_underlying_type (tree x)
2068 if (DECL_IS_BUILTIN (x))
2070 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2071 TYPE_NAME (TREE_TYPE (x)) = x;
2073 else if (TREE_TYPE (x) != error_mark_node
2074 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2076 tree tt = TREE_TYPE (x);
2077 DECL_ORIGINAL_TYPE (x) = tt;
2078 tt = build_variant_type_copy (tt);
2080 TREE_USED (tt) = TREE_USED (x);
2085 /* Record a decl-node X as belonging to the current lexical scope.
2086 Check for errors (such as an incompatible declaration for the same
2087 name already seen in the same scope).
2089 Returns either X or an old decl for the same name.
2090 If an old decl is returned, it may have been smashed
2091 to agree with what X says. */
2096 tree name = DECL_NAME (x);
2097 struct c_scope *scope = current_scope;
2098 struct c_binding *b;
2099 bool nested = false;
2101 /* Functions need the lang_decl data. */
2102 if (TREE_CODE (x) == FUNCTION_DECL && !DECL_LANG_SPECIFIC (x))
2103 DECL_LANG_SPECIFIC (x) = GGC_CNEW (struct lang_decl);
2105 /* Must set DECL_CONTEXT for everything not at file scope or
2106 DECL_FILE_SCOPE_P won't work. Local externs don't count
2107 unless they have initializers (which generate code). */
2108 if (current_function_decl
2109 && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL)
2110 || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
2111 DECL_CONTEXT (x) = current_function_decl;
2113 /* If this is of variably modified type, prevent jumping into its
2115 if ((TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == TYPE_DECL)
2116 && variably_modified_type_p (TREE_TYPE (x), NULL_TREE))
2117 c_begin_vm_scope (scope->depth);
2119 /* Anonymous decls are just inserted in the scope. */
2122 bind (name, x, scope, /*invisible=*/false, /*nested=*/false);
2126 /* First, see if there is another declaration with the same name in
2127 the current scope. If there is, duplicate_decls may do all the
2128 work for us. If duplicate_decls returns false, that indicates
2129 two incompatible decls in the same scope; we are to silently
2130 replace the old one (duplicate_decls has issued all appropriate
2131 diagnostics). In particular, we should not consider possible
2132 duplicates in the external scope, or shadowing. */
2133 b = I_SYMBOL_BINDING (name);
2134 if (b && B_IN_SCOPE (b, scope))
2136 struct c_binding *b_ext, *b_use;
2137 tree type = TREE_TYPE (x);
2138 tree visdecl = b->decl;
2139 tree vistype = TREE_TYPE (visdecl);
2140 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
2141 && COMPLETE_TYPE_P (TREE_TYPE (x)))
2142 b->inner_comp = false;
2145 /* If this is an external linkage declaration, we should check
2146 for compatibility with the type in the external scope before
2147 setting the type at this scope based on the visible
2148 information only. */
2149 if (TREE_PUBLIC (x) && TREE_PUBLIC (visdecl))
2151 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
2152 b_ext = b_ext->shadowed;
2157 TREE_TYPE (b_use->decl) = b_use->type;
2160 if (duplicate_decls (x, b_use->decl))
2164 /* Save the updated type in the external scope and
2165 restore the proper type for this scope. */
2167 if (comptypes (vistype, type))
2168 thistype = composite_type (vistype, type);
2170 thistype = TREE_TYPE (b_use->decl);
2171 b_use->type = TREE_TYPE (b_use->decl);
2172 if (TREE_CODE (b_use->decl) == FUNCTION_DECL
2173 && DECL_BUILT_IN (b_use->decl))
2175 = build_type_attribute_variant (thistype,
2178 TREE_TYPE (b_use->decl) = thistype;
2183 goto skip_external_and_shadow_checks;
2186 /* All declarations with external linkage, and all external
2187 references, go in the external scope, no matter what scope is
2188 current. However, the binding in that scope is ignored for
2189 purposes of normal name lookup. A separate binding structure is
2190 created in the requested scope; this governs the normal
2191 visibility of the symbol.
2193 The binding in the externals scope is used exclusively for
2194 detecting duplicate declarations of the same object, no matter
2195 what scope they are in; this is what we do here. (C99 6.2.7p2:
2196 All declarations that refer to the same object or function shall
2197 have compatible type; otherwise, the behavior is undefined.) */
2198 if (DECL_EXTERNAL (x) || scope == file_scope)
2200 tree type = TREE_TYPE (x);
2203 bool type_saved = false;
2204 if (b && !B_IN_EXTERNAL_SCOPE (b)
2205 && (TREE_CODE (b->decl) == FUNCTION_DECL
2206 || TREE_CODE (b->decl) == VAR_DECL)
2207 && DECL_FILE_SCOPE_P (b->decl))
2210 vistype = TREE_TYPE (visdecl);
2212 if (scope != file_scope
2213 && !DECL_IN_SYSTEM_HEADER (x))
2214 warning (OPT_Wnested_externs, "nested extern declaration of %qD", x);
2216 while (b && !B_IN_EXTERNAL_SCOPE (b))
2218 /* If this decl might be modified, save its type. This is
2219 done here rather than when the decl is first bound
2220 because the type may change after first binding, through
2221 being completed or through attributes being added. If we
2222 encounter multiple such decls, only the first should have
2223 its type saved; the others will already have had their
2224 proper types saved and the types will not have changed as
2225 their scopes will not have been re-entered. */
2226 if (DECL_P (b->decl) && DECL_FILE_SCOPE_P (b->decl) && !type_saved)
2228 b->type = TREE_TYPE (b->decl);
2231 if (B_IN_FILE_SCOPE (b)
2232 && TREE_CODE (b->decl) == VAR_DECL
2233 && TREE_STATIC (b->decl)
2234 && TREE_CODE (TREE_TYPE (b->decl)) == ARRAY_TYPE
2235 && !TYPE_DOMAIN (TREE_TYPE (b->decl))
2236 && TREE_CODE (type) == ARRAY_TYPE
2237 && TYPE_DOMAIN (type)
2238 && TYPE_MAX_VALUE (TYPE_DOMAIN (type))
2239 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type))))
2241 /* Array type completed in inner scope, which should be
2242 diagnosed if the completion does not have size 1 and
2243 it does not get completed in the file scope. */
2244 b->inner_comp = true;
2249 /* If a matching external declaration has been found, set its
2250 type to the composite of all the types of that declaration.
2251 After the consistency checks, it will be reset to the
2252 composite of the visible types only. */
2253 if (b && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2255 TREE_TYPE (b->decl) = b->type;
2257 /* The point of the same_translation_unit_p check here is,
2258 we want to detect a duplicate decl for a construct like
2259 foo() { extern bar(); } ... static bar(); but not if
2260 they are in different translation units. In any case,
2261 the static does not go in the externals scope. */
2263 && (TREE_PUBLIC (x) || same_translation_unit_p (x, b->decl))
2264 && duplicate_decls (x, b->decl))
2269 if (comptypes (vistype, type))
2270 thistype = composite_type (vistype, type);
2272 thistype = TREE_TYPE (b->decl);
2276 b->type = TREE_TYPE (b->decl);
2277 if (TREE_CODE (b->decl) == FUNCTION_DECL && DECL_BUILT_IN (b->decl))
2279 = build_type_attribute_variant (thistype,
2280 TYPE_ATTRIBUTES (b->type));
2281 TREE_TYPE (b->decl) = thistype;
2282 bind (name, b->decl, scope, /*invisible=*/false, /*nested=*/true);
2285 else if (TREE_PUBLIC (x))
2287 if (visdecl && !b && duplicate_decls (x, visdecl))
2289 /* An external declaration at block scope referring to a
2290 visible entity with internal linkage. The composite
2291 type will already be correct for this scope, so we
2292 just need to fall through to make the declaration in
2299 bind (name, x, external_scope, /*invisible=*/true,
2306 if (TREE_CODE (x) != PARM_DECL)
2307 warn_if_shadowing (x);
2309 skip_external_and_shadow_checks:
2310 if (TREE_CODE (x) == TYPE_DECL)
2311 clone_underlying_type (x);
2313 bind (name, x, scope, /*invisible=*/false, nested);
2315 /* If x's type is incomplete because it's based on a
2316 structure or union which has not yet been fully declared,
2317 attach it to that structure or union type, so we can go
2318 back and complete the variable declaration later, if the
2319 structure or union gets fully declared.
2321 If the input is erroneous, we can have error_mark in the type
2322 slot (e.g. "f(void a, ...)") - that doesn't count as an
2324 if (TREE_TYPE (x) != error_mark_node
2325 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2327 tree element = TREE_TYPE (x);
2329 while (TREE_CODE (element) == ARRAY_TYPE)
2330 element = TREE_TYPE (element);
2331 element = TYPE_MAIN_VARIANT (element);
2333 if ((TREE_CODE (element) == RECORD_TYPE
2334 || TREE_CODE (element) == UNION_TYPE)
2335 && (TREE_CODE (x) != TYPE_DECL
2336 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
2337 && !COMPLETE_TYPE_P (element))
2338 C_TYPE_INCOMPLETE_VARS (element)
2339 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
2344 /* Record X as belonging to file scope.
2345 This is used only internally by the Objective-C front end,
2346 and is limited to its needs. duplicate_decls is not called;
2347 if there is any preexisting decl for this identifier, it is an ICE. */
2350 pushdecl_top_level (tree x)
2353 bool nested = false;
2354 gcc_assert (TREE_CODE (x) == VAR_DECL || TREE_CODE (x) == CONST_DECL);
2356 name = DECL_NAME (x);
2358 gcc_assert (TREE_CODE (x) == CONST_DECL || !I_SYMBOL_BINDING (name));
2360 if (TREE_PUBLIC (x))
2362 bind (name, x, external_scope, /*invisible=*/true, /*nested=*/false);
2366 bind (name, x, file_scope, /*invisible=*/false, nested);
2372 implicit_decl_warning (tree id, tree olddecl)
2374 void (*diag) (const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2);
2375 switch (mesg_implicit_function_declaration)
2378 case 1: diag = warning0; break;
2379 case 2: diag = error; break;
2380 default: gcc_unreachable ();
2383 diag (G_("implicit declaration of function %qE"), id);
2385 locate_old_decl (olddecl, diag);
2388 /* Generate an implicit declaration for identifier FUNCTIONID as a
2389 function of type int (). */
2392 implicitly_declare (tree functionid)
2394 struct c_binding *b;
2398 for (b = I_SYMBOL_BINDING (functionid); b; b = b->shadowed)
2400 if (B_IN_SCOPE (b, external_scope))
2409 if (decl == error_mark_node)
2412 /* FIXME: Objective-C has weird not-really-builtin functions
2413 which are supposed to be visible automatically. They wind up
2414 in the external scope because they're pushed before the file
2415 scope gets created. Catch this here and rebind them into the
2417 if (!DECL_BUILT_IN (decl) && DECL_IS_BUILTIN (decl))
2419 bind (functionid, decl, file_scope,
2420 /*invisible=*/false, /*nested=*/true);
2425 tree newtype = default_function_type;
2427 TREE_TYPE (decl) = b->type;
2428 /* Implicit declaration of a function already declared
2429 (somehow) in a different scope, or as a built-in.
2430 If this is the first time this has happened, warn;
2431 then recycle the old declaration but with the new type. */
2432 if (!C_DECL_IMPLICIT (decl))
2434 implicit_decl_warning (functionid, decl);
2435 C_DECL_IMPLICIT (decl) = 1;
2437 if (DECL_BUILT_IN (decl))
2439 newtype = build_type_attribute_variant (newtype,
2441 (TREE_TYPE (decl)));
2442 if (!comptypes (newtype, TREE_TYPE (decl)))
2444 warning (0, "incompatible implicit declaration of built-in"
2445 " function %qD", decl);
2446 newtype = TREE_TYPE (decl);
2451 if (!comptypes (newtype, TREE_TYPE (decl)))
2453 error ("incompatible implicit declaration of function %qD",
2455 locate_old_decl (decl, error);
2458 b->type = TREE_TYPE (decl);
2459 TREE_TYPE (decl) = newtype;
2460 bind (functionid, decl, current_scope,
2461 /*invisible=*/false, /*nested=*/true);
2466 /* Not seen before. */
2467 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2468 DECL_EXTERNAL (decl) = 1;
2469 TREE_PUBLIC (decl) = 1;
2470 C_DECL_IMPLICIT (decl) = 1;
2471 implicit_decl_warning (functionid, 0);
2472 asmspec_tree = maybe_apply_renaming_pragma (decl, /*asmname=*/NULL);
2474 set_user_assembler_name (decl, TREE_STRING_POINTER (asmspec_tree));
2476 /* C89 says implicit declarations are in the innermost block.
2477 So we record the decl in the standard fashion. */
2478 decl = pushdecl (decl);
2480 /* No need to call objc_check_decl here - it's a function type. */
2481 rest_of_decl_compilation (decl, 0, 0);
2483 /* Write a record describing this implicit function declaration
2484 to the prototypes file (if requested). */
2485 gen_aux_info_record (decl, 0, 1, 0);
2487 /* Possibly apply some default attributes to this implicit declaration. */
2488 decl_attributes (&decl, NULL_TREE, 0);
2493 /* Issue an error message for a reference to an undeclared variable
2494 ID, including a reference to a builtin outside of function-call
2495 context. Establish a binding of the identifier to error_mark_node
2496 in an appropriate scope, which will suppress further errors for the
2497 same identifier. The error message should be given location LOC. */
2499 undeclared_variable (tree id, location_t loc)
2501 static bool already = false;
2502 struct c_scope *scope;
2504 if (current_function_decl == 0)
2506 error ("%H%qE undeclared here (not in a function)", &loc, id);
2507 scope = current_scope;
2511 error ("%H%qE undeclared (first use in this function)", &loc, id);
2515 error ("%H(Each undeclared identifier is reported only once", &loc);
2516 error ("%Hfor each function it appears in.)", &loc);
2520 /* If we are parsing old-style parameter decls, current_function_decl
2521 will be nonnull but current_function_scope will be null. */
2522 scope = current_function_scope ? current_function_scope : current_scope;
2524 bind (id, error_mark_node, scope, /*invisible=*/false, /*nested=*/false);
2527 /* Subroutine of lookup_label, declare_label, define_label: construct a
2528 LABEL_DECL with all the proper frills. */
2531 make_label (tree name, location_t location)
2533 tree label = build_decl (LABEL_DECL, name, void_type_node);
2535 DECL_CONTEXT (label) = current_function_decl;
2536 DECL_MODE (label) = VOIDmode;
2537 DECL_SOURCE_LOCATION (label) = location;
2542 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
2543 Create one if none exists so far for the current function.
2544 This is called when a label is used in a goto expression or
2545 has its address taken. */
2548 lookup_label (tree name)
2552 if (current_function_decl == 0)
2554 error ("label %qE referenced outside of any function", name);
2558 /* Use a label already defined or ref'd with this name, but not if
2559 it is inherited from a containing function and wasn't declared
2561 label = I_LABEL_DECL (name);
2562 if (label && (DECL_CONTEXT (label) == current_function_decl
2563 || C_DECLARED_LABEL_FLAG (label)))
2565 /* If the label has only been declared, update its apparent
2566 location to point here, for better diagnostics if it
2567 turns out not to have been defined. */
2568 if (!TREE_USED (label))
2569 DECL_SOURCE_LOCATION (label) = input_location;
2573 /* No label binding for that identifier; make one. */
2574 label = make_label (name, input_location);
2576 /* Ordinary labels go in the current function scope. */
2577 bind (name, label, current_function_scope,
2578 /*invisible=*/false, /*nested=*/false);
2582 /* Make a label named NAME in the current function, shadowing silently
2583 any that may be inherited from containing functions or containing
2584 scopes. This is called for __label__ declarations. */
2587 declare_label (tree name)
2589 struct c_binding *b = I_LABEL_BINDING (name);
2592 /* Check to make sure that the label hasn't already been declared
2594 if (b && B_IN_CURRENT_SCOPE (b))
2596 error ("duplicate label declaration %qE", name);
2597 locate_old_decl (b->decl, error);
2599 /* Just use the previous declaration. */
2603 label = make_label (name, input_location);
2604 C_DECLARED_LABEL_FLAG (label) = 1;
2606 /* Declared labels go in the current scope. */
2607 bind (name, label, current_scope,
2608 /*invisible=*/false, /*nested=*/false);
2612 /* Define a label, specifying the location in the source file.
2613 Return the LABEL_DECL node for the label, if the definition is valid.
2614 Otherwise return 0. */
2617 define_label (location_t location, tree name)
2619 /* Find any preexisting label with this name. It is an error
2620 if that label has already been defined in this function, or
2621 if there is a containing function with a declared label with
2623 tree label = I_LABEL_DECL (name);
2624 struct c_label_list *nlist_se, *nlist_vm;
2627 && ((DECL_CONTEXT (label) == current_function_decl
2628 && DECL_INITIAL (label) != 0)
2629 || (DECL_CONTEXT (label) != current_function_decl
2630 && C_DECLARED_LABEL_FLAG (label))))
2632 error ("%Hduplicate label %qD", &location, label);
2633 locate_old_decl (label, error);
2636 else if (label && DECL_CONTEXT (label) == current_function_decl)
2638 /* The label has been used or declared already in this function,
2639 but not defined. Update its location to point to this
2641 if (C_DECL_UNDEFINABLE_STMT_EXPR (label))
2642 error ("%Jjump into statement expression", label);
2643 if (C_DECL_UNDEFINABLE_VM (label))
2644 error ("%Jjump into scope of identifier with variably modified type",
2646 DECL_SOURCE_LOCATION (label) = location;
2650 /* No label binding for that identifier; make one. */
2651 label = make_label (name, location);
2653 /* Ordinary labels go in the current function scope. */
2654 bind (name, label, current_function_scope,
2655 /*invisible=*/false, /*nested=*/false);
2658 if (!in_system_header && lookup_name (name))
2659 warning (OPT_Wtraditional, "%Htraditional C lacks a separate namespace "
2660 "for labels, identifier %qE conflicts", &location, name);
2662 nlist_se = XOBNEW (&parser_obstack, struct c_label_list);
2663 nlist_se->next = label_context_stack_se->labels_def;
2664 nlist_se->label = label;
2665 label_context_stack_se->labels_def = nlist_se;
2667 nlist_vm = XOBNEW (&parser_obstack, struct c_label_list);
2668 nlist_vm->next = label_context_stack_vm->labels_def;
2669 nlist_vm->label = label;
2670 label_context_stack_vm->labels_def = nlist_vm;
2672 /* Mark label as having been defined. */
2673 DECL_INITIAL (label) = error_mark_node;
2677 /* Given NAME, an IDENTIFIER_NODE,
2678 return the structure (or union or enum) definition for that name.
2679 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2680 CODE says which kind of type the caller wants;
2681 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2682 If the wrong kind of type is found, an error is reported. */
2685 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2687 struct c_binding *b = I_TAG_BINDING (name);
2693 /* We only care about whether it's in this level if
2694 thislevel_only was set or it might be a type clash. */
2695 if (thislevel_only || TREE_CODE (b->decl) != code)
2697 /* For our purposes, a tag in the external scope is the same as
2698 a tag in the file scope. (Primarily relevant to Objective-C
2699 and its builtin structure tags, which get pushed before the
2700 file scope is created.) */
2701 if (B_IN_CURRENT_SCOPE (b)
2702 || (current_scope == file_scope && B_IN_EXTERNAL_SCOPE (b)))
2706 if (thislevel_only && !thislevel)
2709 if (TREE_CODE (b->decl) != code)
2711 /* Definition isn't the kind we were looking for. */
2712 pending_invalid_xref = name;
2713 pending_invalid_xref_location = input_location;
2715 /* If in the same binding level as a declaration as a tag
2716 of a different type, this must not be allowed to
2717 shadow that tag, so give the error immediately.
2718 (For example, "struct foo; union foo;" is invalid.) */
2720 pending_xref_error ();
2725 /* Print an error message now
2726 for a recent invalid struct, union or enum cross reference.
2727 We don't print them immediately because they are not invalid
2728 when used in the `struct foo;' construct for shadowing. */
2731 pending_xref_error (void)
2733 if (pending_invalid_xref != 0)
2734 error ("%H%qE defined as wrong kind of tag",
2735 &pending_invalid_xref_location, pending_invalid_xref);
2736 pending_invalid_xref = 0;
2740 /* Look up NAME in the current scope and its superiors
2741 in the namespace of variables, functions and typedefs.
2742 Return a ..._DECL node of some kind representing its definition,
2743 or return 0 if it is undefined. */
2746 lookup_name (tree name)
2748 struct c_binding *b = I_SYMBOL_BINDING (name);
2749 if (b && !b->invisible)
2754 /* Similar to `lookup_name' but look only at the indicated scope. */
2757 lookup_name_in_scope (tree name, struct c_scope *scope)
2759 struct c_binding *b;
2761 for (b = I_SYMBOL_BINDING (name); b; b = b->shadowed)
2762 if (B_IN_SCOPE (b, scope))
2767 /* Create the predefined scalar types of C,
2768 and some nodes representing standard constants (0, 1, (void *) 0).
2769 Initialize the global scope.
2770 Make definitions for built-in primitive functions. */
2773 c_init_decl_processing (void)
2775 location_t save_loc = input_location;
2777 /* Initialize reserved words for parser. */
2780 current_function_decl = 0;
2782 gcc_obstack_init (&parser_obstack);
2784 /* Make the externals scope. */
2786 external_scope = current_scope;
2788 /* Declarations from c_common_nodes_and_builtins must not be associated
2789 with this input file, lest we get differences between using and not
2790 using preprocessed headers. */
2791 #ifdef USE_MAPPED_LOCATION
2792 input_location = BUILTINS_LOCATION;
2794 input_location.file = "<built-in>";
2795 input_location.line = 0;
2798 build_common_tree_nodes (flag_signed_char, false);
2800 c_common_nodes_and_builtins ();
2802 /* In C, comparisons and TRUTH_* expressions have type int. */
2803 truthvalue_type_node = integer_type_node;
2804 truthvalue_true_node = integer_one_node;
2805 truthvalue_false_node = integer_zero_node;
2807 /* Even in C99, which has a real boolean type. */
2808 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2809 boolean_type_node));
2811 input_location = save_loc;
2813 pedantic_lvalues = true;
2815 make_fname_decl = c_make_fname_decl;
2816 start_fname_decls ();
2819 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2820 decl, NAME is the initialization string and TYPE_DEP indicates whether
2821 NAME depended on the type of the function. As we don't yet implement
2822 delayed emission of static data, we mark the decl as emitted
2823 so it is not placed in the output. Anything using it must therefore pull
2824 out the STRING_CST initializer directly. FIXME. */
2827 c_make_fname_decl (tree id, int type_dep)
2829 const char *name = fname_as_string (type_dep);
2830 tree decl, type, init;
2831 size_t length = strlen (name);
2833 type = build_array_type (char_type_node,
2834 build_index_type (size_int (length)));
2835 type = c_build_qualified_type (type, TYPE_QUAL_CONST);
2837 decl = build_decl (VAR_DECL, id, type);
2839 TREE_STATIC (decl) = 1;
2840 TREE_READONLY (decl) = 1;
2841 DECL_ARTIFICIAL (decl) = 1;
2843 init = build_string (length + 1, name);
2844 free ((char *) name);
2845 TREE_TYPE (init) = type;
2846 DECL_INITIAL (decl) = init;
2848 TREE_USED (decl) = 1;
2850 if (current_function_decl
2851 /* For invalid programs like this:
2854 const char* p = __FUNCTION__;
2856 the __FUNCTION__ is believed to appear in K&R style function
2857 parameter declarator. In that case we still don't have
2859 && (!errorcount || current_function_scope))
2861 DECL_CONTEXT (decl) = current_function_decl;
2862 bind (id, decl, current_function_scope,
2863 /*invisible=*/false, /*nested=*/false);
2866 finish_decl (decl, init, NULL_TREE);
2871 /* Return a definition for a builtin function named NAME and whose data type
2872 is TYPE. TYPE should be a function type with argument types.
2873 FUNCTION_CODE tells later passes how to compile calls to this function.
2874 See tree.h for its possible values.
2876 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2877 the name to be called if we can't opencode the function. If
2878 ATTRS is nonzero, use that for the function's attribute list. */
2881 builtin_function (const char *name, tree type, int function_code,
2882 enum built_in_class cl, const char *library_name,
2885 tree id = get_identifier (name);
2886 tree decl = build_decl (FUNCTION_DECL, id, type);
2887 TREE_PUBLIC (decl) = 1;
2888 DECL_EXTERNAL (decl) = 1;
2889 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
2890 DECL_BUILT_IN_CLASS (decl) = cl;
2891 DECL_FUNCTION_CODE (decl) = function_code;
2892 C_DECL_BUILTIN_PROTOTYPE (decl) = (TYPE_ARG_TYPES (type) != 0);
2894 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2896 /* Should never be called on a symbol with a preexisting meaning. */
2897 gcc_assert (!I_SYMBOL_BINDING (id));
2899 bind (id, decl, external_scope, /*invisible=*/true, /*nested=*/false);
2901 /* Builtins in the implementation namespace are made visible without
2902 needing to be explicitly declared. See push_file_scope. */
2903 if (name[0] == '_' && (name[1] == '_' || ISUPPER (name[1])))
2905 TREE_CHAIN (decl) = visible_builtins;
2906 visible_builtins = decl;
2909 /* Possibly apply some default attributes to this built-in function. */
2911 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2913 decl_attributes (&decl, NULL_TREE, 0);
2918 /* Called when a declaration is seen that contains no names to declare.
2919 If its type is a reference to a structure, union or enum inherited
2920 from a containing scope, shadow that tag name for the current scope
2921 with a forward reference.
2922 If its type defines a new named structure or union
2923 or defines an enum, it is valid but we need not do anything here.
2924 Otherwise, it is an error. */
2927 shadow_tag (const struct c_declspecs *declspecs)
2929 shadow_tag_warned (declspecs, 0);
2932 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
2935 shadow_tag_warned (const struct c_declspecs *declspecs, int warned)
2937 bool found_tag = false;
2939 if (declspecs->type && !declspecs->default_int_p && !declspecs->typedef_p)
2941 tree value = declspecs->type;
2942 enum tree_code code = TREE_CODE (value);
2944 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2945 /* Used to test also that TYPE_SIZE (value) != 0.
2946 That caused warning for `struct foo;' at top level in the file. */
2948 tree name = TYPE_NAME (value);
2955 if (warned != 1 && code != ENUMERAL_TYPE)
2956 /* Empty unnamed enum OK */
2958 pedwarn ("unnamed struct/union that defines no instances");
2962 else if (!declspecs->tag_defined_p
2963 && declspecs->storage_class != csc_none)
2966 pedwarn ("empty declaration with storage class specifier "
2967 "does not redeclare tag");
2969 pending_xref_error ();
2971 else if (!declspecs->tag_defined_p
2972 && (declspecs->const_p
2973 || declspecs->volatile_p
2974 || declspecs->restrict_p))
2977 pedwarn ("empty declaration with type qualifier "
2978 "does not redeclare tag");
2980 pending_xref_error ();
2984 pending_invalid_xref = 0;
2985 t = lookup_tag (code, name, 1);
2989 t = make_node (code);
2996 if (warned != 1 && !in_system_header)
2998 pedwarn ("useless type name in empty declaration");
3003 else if (warned != 1 && !in_system_header && declspecs->typedef_p)
3005 pedwarn ("useless type name in empty declaration");
3009 pending_invalid_xref = 0;
3011 if (declspecs->inline_p)
3013 error ("%<inline%> in empty declaration");
3017 if (current_scope == file_scope && declspecs->storage_class == csc_auto)
3019 error ("%<auto%> in file-scope empty declaration");
3023 if (current_scope == file_scope && declspecs->storage_class == csc_register)
3025 error ("%<register%> in file-scope empty declaration");
3029 if (!warned && !in_system_header && declspecs->storage_class != csc_none)
3031 warning (0, "useless storage class specifier in empty declaration");
3035 if (!warned && !in_system_header && declspecs->thread_p)
3037 warning (0, "useless %<__thread%> in empty declaration");
3041 if (!warned && !in_system_header && (declspecs->const_p
3042 || declspecs->volatile_p
3043 || declspecs->restrict_p))
3045 warning (0, "useless type qualifier in empty declaration");
3052 pedwarn ("empty declaration");
3057 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
3058 bits. SPECS represents declaration specifiers that the grammar
3059 only permits to contain type qualifiers and attributes. */
3062 quals_from_declspecs (const struct c_declspecs *specs)
3064 int quals = ((specs->const_p ? TYPE_QUAL_CONST : 0)
3065 | (specs->volatile_p ? TYPE_QUAL_VOLATILE : 0)
3066 | (specs->restrict_p ? TYPE_QUAL_RESTRICT : 0));
3067 gcc_assert (!specs->type
3068 && !specs->decl_attr
3069 && specs->typespec_word == cts_none
3070 && specs->storage_class == csc_none
3071 && !specs->typedef_p
3072 && !specs->explicit_signed_p
3073 && !specs->deprecated_p
3075 && !specs->long_long_p
3078 && !specs->unsigned_p
3079 && !specs->complex_p
3081 && !specs->thread_p);
3085 /* Construct an array declarator. EXPR is the expression inside [],
3086 or NULL_TREE. QUALS are the type qualifiers inside the [] (to be
3087 applied to the pointer to which a parameter array is converted).
3088 STATIC_P is true if "static" is inside the [], false otherwise.
3089 VLA_UNSPEC_P is true if the array is [*], a VLA of unspecified
3090 length which is nevertheless a complete type, false otherwise. The
3091 field for the contained declarator is left to be filled in by
3092 set_array_declarator_inner. */
3094 struct c_declarator *
3095 build_array_declarator (tree expr, struct c_declspecs *quals, bool static_p,
3098 struct c_declarator *declarator = XOBNEW (&parser_obstack,
3099 struct c_declarator);
3100 declarator->kind = cdk_array;
3101 declarator->declarator = 0;
3102 declarator->u.array.dimen = expr;
3105 declarator->u.array.attrs = quals->attrs;
3106 declarator->u.array.quals = quals_from_declspecs (quals);
3110 declarator->u.array.attrs = NULL_TREE;
3111 declarator->u.array.quals = 0;
3113 declarator->u.array.static_p = static_p;
3114 declarator->u.array.vla_unspec_p = vla_unspec_p;
3115 if (pedantic && !flag_isoc99)
3117 if (static_p || quals != NULL)
3118 pedwarn ("ISO C90 does not support %<static%> or type "
3119 "qualifiers in parameter array declarators");
3121 pedwarn ("ISO C90 does not support %<[*]%> array declarators");
3125 if (!current_scope->parm_flag)
3128 error ("%<[*]%> not allowed in other than function prototype scope");
3129 declarator->u.array.vla_unspec_p = false;
3132 current_scope->had_vla_unspec = true;
3137 /* Set the contained declarator of an array declarator. DECL is the
3138 declarator, as constructed by build_array_declarator; INNER is what
3139 appears on the left of the []. ABSTRACT_P is true if it is an
3140 abstract declarator, false otherwise; this is used to reject static
3141 and type qualifiers in abstract declarators, where they are not in
3142 the C99 grammar (subject to possible change in DR#289). */
3144 struct c_declarator *
3145 set_array_declarator_inner (struct c_declarator *decl,
3146 struct c_declarator *inner, bool abstract_p)
3148 decl->declarator = inner;
3149 if (abstract_p && (decl->u.array.quals != TYPE_UNQUALIFIED
3150 || decl->u.array.attrs != NULL_TREE
3151 || decl->u.array.static_p))
3152 error ("static or type qualifiers in abstract declarator");
3156 /* INIT is a constructor that forms DECL's initializer. If the final
3157 element initializes a flexible array field, add the size of that
3158 initializer to DECL's size. */
3161 add_flexible_array_elts_to_size (tree decl, tree init)
3165 if (VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (init)))
3168 elt = VEC_last (constructor_elt, CONSTRUCTOR_ELTS (init))->value;
3169 type = TREE_TYPE (elt);
3170 if (TREE_CODE (type) == ARRAY_TYPE
3171 && TYPE_SIZE (type) == NULL_TREE
3172 && TYPE_DOMAIN (type) != NULL_TREE
3173 && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) == NULL_TREE)
3175 complete_array_type (&type, elt, false);
3177 = size_binop (PLUS_EXPR, DECL_SIZE (decl), TYPE_SIZE (type));
3178 DECL_SIZE_UNIT (decl)
3179 = size_binop (PLUS_EXPR, DECL_SIZE_UNIT (decl), TYPE_SIZE_UNIT (type));
3183 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3186 groktypename (struct c_type_name *type_name)
3189 tree attrs = type_name->specs->attrs;
3191 type_name->specs->attrs = NULL_TREE;
3193 type = grokdeclarator (type_name->declarator, type_name->specs, TYPENAME,
3196 /* Apply attributes. */
3197 decl_attributes (&type, attrs, 0);
3202 /* Decode a declarator in an ordinary declaration or data definition.
3203 This is called as soon as the type information and variable name
3204 have been parsed, before parsing the initializer if any.
3205 Here we create the ..._DECL node, fill in its type,
3206 and put it on the list of decls for the current context.
3207 The ..._DECL node is returned as the value.
3209 Exception: for arrays where the length is not specified,
3210 the type is left null, to be filled in by `finish_decl'.
3212 Function definitions do not come here; they go to start_function
3213 instead. However, external and forward declarations of functions
3214 do go through here. Structure field declarations are done by
3215 grokfield and not through here. */
3218 start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
3219 bool initialized, tree attributes)
3224 /* An object declared as __attribute__((deprecated)) suppresses
3225 warnings of uses of other deprecated items. */
3226 if (lookup_attribute ("deprecated", attributes))
3227 deprecated_state = DEPRECATED_SUPPRESS;
3229 decl = grokdeclarator (declarator, declspecs,
3230 NORMAL, initialized, NULL);
3234 deprecated_state = DEPRECATED_NORMAL;
3236 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3237 && MAIN_NAME_P (DECL_NAME (decl)))
3238 warning (OPT_Wmain, "%q+D is usually a function", decl);
3241 /* Is it valid for this decl to have an initializer at all?
3242 If not, set INITIALIZED to zero, which will indirectly
3243 tell 'finish_decl' to ignore the initializer once it is parsed. */
3244 switch (TREE_CODE (decl))
3247 error ("typedef %qD is initialized (use __typeof__ instead)", decl);
3252 error ("function %qD is initialized like a variable", decl);
3257 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3258 error ("parameter %qD is initialized", decl);
3263 /* Don't allow initializations for incomplete types except for
3264 arrays which might be completed by the initialization. */
3266 /* This can happen if the array size is an undefined macro.
3267 We already gave a warning, so we don't need another one. */
3268 if (TREE_TYPE (decl) == error_mark_node)
3270 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3272 /* A complete type is ok if size is fixed. */
3274 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3275 || C_DECL_VARIABLE_SIZE (decl))
3277 error ("variable-sized object may not be initialized");
3281 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3283 error ("variable %qD has initializer but incomplete type", decl);
3286 else if (C_DECL_VARIABLE_SIZE (decl))
3288 /* Although C99 is unclear about whether incomplete arrays
3289 of VLAs themselves count as VLAs, it does not make
3290 sense to permit them to be initialized given that
3291 ordinary VLAs may not be initialized. */
3292 error ("variable-sized object may not be initialized");
3299 if (current_scope == file_scope)
3300 TREE_STATIC (decl) = 1;
3302 /* Tell 'pushdecl' this is an initialized decl
3303 even though we don't yet have the initializer expression.
3304 Also tell 'finish_decl' it may store the real initializer. */
3305 DECL_INITIAL (decl) = error_mark_node;
3308 /* If this is a function declaration, write a record describing it to the
3309 prototypes file (if requested). */
3311 if (TREE_CODE (decl) == FUNCTION_DECL)
3312 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3314 /* ANSI specifies that a tentative definition which is not merged with
3315 a non-tentative definition behaves exactly like a definition with an
3316 initializer equal to zero. (Section 3.7.2)
3318 -fno-common gives strict ANSI behavior, though this tends to break
3319 a large body of code that grew up without this rule.
3321 Thread-local variables are never common, since there's no entrenched
3322 body of code to break, and it allows more efficient variable references
3323 in the presence of dynamic linking. */
3325 if (TREE_CODE (decl) == VAR_DECL
3327 && TREE_PUBLIC (decl)
3328 && !DECL_THREAD_LOCAL_P (decl)
3330 DECL_COMMON (decl) = 1;
3332 /* Set attributes here so if duplicate decl, will have proper attributes. */
3333 decl_attributes (&decl, attributes, 0);
3335 /* Handle gnu_inline attribute. */
3336 if (declspecs->inline_p
3337 && !flag_gnu89_inline
3338 && TREE_CODE (decl) == FUNCTION_DECL
3339 && lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl)))
3341 if (declspecs->storage_class == csc_auto && current_scope != file_scope)
3343 else if (declspecs->storage_class != csc_static)
3344 DECL_EXTERNAL (decl) = !DECL_EXTERNAL (decl);
3347 if (TREE_CODE (decl) == FUNCTION_DECL
3348 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
3350 struct c_declarator *ce = declarator;
3352 if (ce->kind == cdk_pointer)
3353 ce = declarator->declarator;
3354 if (ce->kind == cdk_function)
3356 tree args = ce->u.arg_info->parms;
3357 for (; args; args = TREE_CHAIN (args))
3359 tree type = TREE_TYPE (args);
3360 if (type && INTEGRAL_TYPE_P (type)
3361 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
3362 DECL_ARG_TYPE (args) = integer_type_node;
3367 if (TREE_CODE (decl) == FUNCTION_DECL
3368 && DECL_DECLARED_INLINE_P (decl)
3369 && DECL_UNINLINABLE (decl)
3370 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3371 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
3374 /* C99 6.7.4p3: An inline definition of a function with external
3375 linkage shall not contain a definition of a modifiable object
3376 with static storage duration... */
3377 if (TREE_CODE (decl) == VAR_DECL
3378 && current_scope != file_scope
3379 && TREE_STATIC (decl)
3380 && !TREE_READONLY (decl)
3381 && DECL_DECLARED_INLINE_P (current_function_decl)
3382 && DECL_EXTERNAL (current_function_decl))
3383 pedwarn ("%q+D is static but declared in inline function %qD "
3384 "which is not static", decl, current_function_decl);
3386 /* Add this decl to the current scope.
3387 TEM may equal DECL or it may be a previous decl of the same name. */
3388 tem = pushdecl (decl);
3390 if (initialized && DECL_EXTERNAL (tem))
3392 DECL_EXTERNAL (tem) = 0;
3393 TREE_STATIC (tem) = 1;
3399 /* Initialize EH if not initialized yet and exceptions are enabled. */
3402 c_maybe_initialize_eh (void)
3404 if (!flag_exceptions || c_eh_initialized_p)
3407 c_eh_initialized_p = true;
3408 eh_personality_libfunc
3409 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3410 ? "__gcc_personality_sj0"
3411 : "__gcc_personality_v0");
3412 default_init_unwind_resume_libfunc ();
3413 using_eh_for_cleanups ();
3416 /* Finish processing of a declaration;
3417 install its initial value.
3418 If the length of an array type is not known before,
3419 it must be determined now, from the initial value, or it is an error. */
3422 finish_decl (tree decl, tree init, tree asmspec_tree)
3425 int was_incomplete = (DECL_SIZE (decl) == 0);
3426 const char *asmspec = 0;
3428 /* If a name was specified, get the string. */
3429 if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
3430 && DECL_FILE_SCOPE_P (decl))
3431 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
3433 asmspec = TREE_STRING_POINTER (asmspec_tree);
3435 /* If `start_decl' didn't like having an initialization, ignore it now. */
3436 if (init != 0 && DECL_INITIAL (decl) == 0)
3439 /* Don't crash if parm is initialized. */
3440 if (TREE_CODE (decl) == PARM_DECL)
3444 store_init_value (decl, init);
3446 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
3447 || TREE_CODE (decl) == FUNCTION_DECL
3448 || TREE_CODE (decl) == FIELD_DECL))
3449 objc_check_decl (decl);
3451 type = TREE_TYPE (decl);
3453 /* Deduce size of array from initialization, if not already known. */
3454 if (TREE_CODE (type) == ARRAY_TYPE
3455 && TYPE_DOMAIN (type) == 0
3456 && TREE_CODE (decl) != TYPE_DECL)
3459 = (TREE_STATIC (decl)
3460 /* Even if pedantic, an external linkage array
3461 may have incomplete type at first. */
3462 ? pedantic && !TREE_PUBLIC (decl)
3463 : !DECL_EXTERNAL (decl));
3465 = complete_array_type (&TREE_TYPE (decl), DECL_INITIAL (decl),
3468 /* Get the completed type made by complete_array_type. */
3469 type = TREE_TYPE (decl);
3474 error ("initializer fails to determine size of %q+D", decl);
3479 error ("array size missing in %q+D", decl);
3480 /* If a `static' var's size isn't known,
3481 make it extern as well as static, so it does not get
3483 If it is not `static', then do not mark extern;
3484 finish_incomplete_decl will give it a default size
3485 and it will get allocated. */
3486 else if (!pedantic && TREE_STATIC (decl) && !TREE_PUBLIC (decl))
3487 DECL_EXTERNAL (decl) = 1;
3491 error ("zero or negative size array %q+D", decl);
3495 /* For global variables, update the copy of the type that
3496 exists in the binding. */
3497 if (TREE_PUBLIC (decl))
3499 struct c_binding *b_ext = I_SYMBOL_BINDING (DECL_NAME (decl));
3500 while (b_ext && !B_IN_EXTERNAL_SCOPE (b_ext))
3501 b_ext = b_ext->shadowed;
3505 b_ext->type = composite_type (b_ext->type, type);
3516 if (DECL_INITIAL (decl))
3517 TREE_TYPE (DECL_INITIAL (decl)) = type;
3519 layout_decl (decl, 0);
3522 if (TREE_CODE (decl) == VAR_DECL)
3524 if (init && TREE_CODE (init) == CONSTRUCTOR)
3525 add_flexible_array_elts_to_size (decl, init);
3527 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3528 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3529 layout_decl (decl, 0);
3531 if (DECL_SIZE (decl) == 0
3532 /* Don't give an error if we already gave one earlier. */
3533 && TREE_TYPE (decl) != error_mark_node
3534 && (TREE_STATIC (decl)
3535 /* A static variable with an incomplete type
3536 is an error if it is initialized.
3537 Also if it is not file scope.
3538 Otherwise, let it through, but if it is not `extern'
3539 then it may cause an error message later. */
3540 ? (DECL_INITIAL (decl) != 0
3541 || !DECL_FILE_SCOPE_P (decl))
3542 /* An automatic variable with an incomplete type
3544 : !DECL_EXTERNAL (decl)))
3546 error ("storage size of %q+D isn%'t known", decl);
3547 TREE_TYPE (decl) = error_mark_node;
3550 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3551 && DECL_SIZE (decl) != 0)
3553 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3554 constant_expression_warning (DECL_SIZE (decl));
3556 error ("storage size of %q+D isn%'t constant", decl);
3559 if (TREE_USED (type))
3560 TREE_USED (decl) = 1;
3563 /* If this is a function and an assembler name is specified, reset DECL_RTL
3564 so we can give it its new name. Also, update built_in_decls if it
3565 was a normal built-in. */
3566 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3568 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
3569 set_builtin_user_assembler_name (decl, asmspec);
3570 set_user_assembler_name (decl, asmspec);
3573 /* If #pragma weak was used, mark the decl weak now. */
3574 maybe_apply_pragma_weak (decl);
3576 /* Output the assembler code and/or RTL code for variables and functions,
3577 unless the type is an undefined structure or union.
3578 If not, it will get done when the type is completed. */
3580 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3582 /* Determine the ELF visibility. */
3583 if (TREE_PUBLIC (decl))
3584 c_determine_visibility (decl);
3586 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3587 if (c_dialect_objc ())
3588 objc_check_decl (decl);
3592 /* If this is not a static variable, issue a warning.
3593 It doesn't make any sense to give an ASMSPEC for an
3594 ordinary, non-register local variable. Historically,
3595 GCC has accepted -- but ignored -- the ASMSPEC in
3597 if (!DECL_FILE_SCOPE_P (decl)
3598 && TREE_CODE (decl) == VAR_DECL
3599 && !C_DECL_REGISTER (decl)
3600 && !TREE_STATIC (decl))
3601 warning (0, "ignoring asm-specifier for non-static local "
3602 "variable %q+D", decl);
3604 set_user_assembler_name (decl, asmspec);
3607 if (DECL_FILE_SCOPE_P (decl))
3609 if (DECL_INITIAL (decl) == NULL_TREE
3610 || DECL_INITIAL (decl) == error_mark_node)
3611 /* Don't output anything
3612 when a tentative file-scope definition is seen.
3613 But at end of compilation, do output code for them. */
3614 DECL_DEFER_OUTPUT (decl) = 1;
3615 rest_of_decl_compilation (decl, true, 0);
3619 /* In conjunction with an ASMSPEC, the `register'
3620 keyword indicates that we should place the variable
3621 in a particular register. */
3622 if (asmspec && C_DECL_REGISTER (decl))
3624 DECL_HARD_REGISTER (decl) = 1;
3625 /* This cannot be done for a structure with volatile
3626 fields, on which DECL_REGISTER will have been
3628 if (!DECL_REGISTER (decl))
3629 error ("cannot put object with volatile field into register");
3632 if (TREE_CODE (decl) != FUNCTION_DECL)
3634 /* If we're building a variable sized type, and we might be
3635 reachable other than via the top of the current binding
3636 level, then create a new BIND_EXPR so that we deallocate
3637 the object at the right time. */
3638 /* Note that DECL_SIZE can be null due to errors. */
3639 if (DECL_SIZE (decl)
3640 && !TREE_CONSTANT (DECL_SIZE (decl))
3641 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list))
3644 bind = build3 (BIND_EXPR, void_type_node, NULL, NULL, NULL);
3645 TREE_SIDE_EFFECTS (bind) = 1;
3647 BIND_EXPR_BODY (bind) = push_stmt_list ();
3649 add_stmt (build_stmt (DECL_EXPR, decl));
3654 if (!DECL_FILE_SCOPE_P (decl))
3656 /* Recompute the RTL of a local array now
3657 if it used to be an incomplete type. */
3659 && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
3661 /* If we used it already as memory, it must stay in memory. */
3662 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3663 /* If it's still incomplete now, no init will save it. */
3664 if (DECL_SIZE (decl) == 0)
3665 DECL_INITIAL (decl) = 0;
3670 /* If this was marked 'used', be sure it will be output. */
3671 if (!flag_unit_at_a_time && lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
3672 mark_decl_referenced (decl);
3674 if (TREE_CODE (decl) == TYPE_DECL)
3676 if (!DECL_FILE_SCOPE_P (decl)
3677 && variably_modified_type_p (TREE_TYPE (decl), NULL_TREE))
3678 add_stmt (build_stmt (DECL_EXPR, decl));
3680 rest_of_decl_compilation (decl, DECL_FILE_SCOPE_P (decl), 0);
3683 /* At the end of a declaration, throw away any variable type sizes
3684 of types defined inside that declaration. There is no use
3685 computing them in the following function definition. */
3686 if (current_scope == file_scope)
3687 get_pending_sizes ();
3689 /* Install a cleanup (aka destructor) if one was given. */
3690 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
3692 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
3695 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
3696 tree cleanup_decl = lookup_name (cleanup_id);
3699 /* Build "cleanup(&decl)" for the destructor. */
3700 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
3701 cleanup = build_tree_list (NULL_TREE, cleanup);
3702 cleanup = build_function_call (cleanup_decl, cleanup);
3704 /* Don't warn about decl unused; the cleanup uses it. */
3705 TREE_USED (decl) = 1;
3706 TREE_USED (cleanup_decl) = 1;
3708 /* Initialize EH, if we've been told to do so. */
3709 c_maybe_initialize_eh ();
3711 push_cleanup (decl, cleanup, false);
3716 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
3719 grokparm (const struct c_parm *parm)
3721 tree decl = grokdeclarator (parm->declarator, parm->specs, PARM, false,
3724 decl_attributes (&decl, parm->attrs, 0);
3729 /* Given a parsed parameter declaration, decode it into a PARM_DECL
3730 and push that on the current scope. */
3733 push_parm_decl (const struct c_parm *parm)
3737 decl = grokdeclarator (parm->declarator, parm->specs, PARM, false, NULL);
3738 decl_attributes (&decl, parm->attrs, 0);
3740 decl = pushdecl (decl);
3742 finish_decl (decl, NULL_TREE, NULL_TREE);
3745 /* Mark all the parameter declarations to date as forward decls.
3746 Also diagnose use of this extension. */
3749 mark_forward_parm_decls (void)
3751 struct c_binding *b;
3753 if (pedantic && !current_scope->warned_forward_parm_decls)
3755 pedwarn ("ISO C forbids forward parameter declarations");
3756 current_scope->warned_forward_parm_decls = true;
3759 for (b = current_scope->bindings; b; b = b->prev)
3760 if (TREE_CODE (b->decl) == PARM_DECL)
3761 TREE_ASM_WRITTEN (b->decl) = 1;
3764 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3765 literal, which may be an incomplete array type completed by the
3766 initializer; INIT is a CONSTRUCTOR that initializes the compound
3770 build_compound_literal (tree type, tree init)
3772 /* We do not use start_decl here because we have a type, not a declarator;
3773 and do not use finish_decl because the decl should be stored inside
3774 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
3779 if (type == error_mark_node)
3780 return error_mark_node;
3782 decl = build_decl (VAR_DECL, NULL_TREE, type);
3783 DECL_EXTERNAL (decl) = 0;
3784 TREE_PUBLIC (decl) = 0;
3785 TREE_STATIC (decl) = (current_scope == file_scope);
3786 DECL_CONTEXT (decl) = current_function_decl;
3787 TREE_USED (decl) = 1;
3788 TREE_TYPE (decl) = type;
3789 TREE_READONLY (decl) = TYPE_READONLY (type);
3790 store_init_value (decl, init);
3792 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3794 int failure = complete_array_type (&TREE_TYPE (decl),
3795 DECL_INITIAL (decl), true);
3796 gcc_assert (!failure);
3798 type = TREE_TYPE (decl);
3799 TREE_TYPE (DECL_INITIAL (decl)) = type;
3802 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3803 return error_mark_node;
3805 stmt = build_stmt (DECL_EXPR, decl);
3806 complit = build1 (COMPOUND_LITERAL_EXPR, type, stmt);
3807 TREE_SIDE_EFFECTS (complit) = 1;
3809 layout_decl (decl, 0);
3811 if (TREE_STATIC (decl))
3813 /* This decl needs a name for the assembler output. */
3814 set_compound_literal_name (decl);
3815 DECL_DEFER_OUTPUT (decl) = 1;
3816 DECL_COMDAT (decl) = 1;
3817 DECL_ARTIFICIAL (decl) = 1;
3818 DECL_IGNORED_P (decl) = 1;
3820 rest_of_decl_compilation (decl, 1, 0);
3826 /* Determine whether TYPE is a structure with a flexible array member,
3827 or a union containing such a structure (possibly recursively). */
3830 flexible_array_type_p (tree type)
3833 switch (TREE_CODE (type))
3836 x = TYPE_FIELDS (type);
3839 while (TREE_CHAIN (x) != NULL_TREE)
3841 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3842 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3843 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3844 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3848 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3850 if (flexible_array_type_p (TREE_TYPE (x)))
3859 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3860 replacing with appropriate values if they are invalid. */
3862 check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
3865 unsigned int max_width;
3866 unsigned HOST_WIDE_INT w;
3867 const char *name = orig_name ? orig_name: _("<anonymous>");
3869 /* Detect and ignore out of range field width and process valid
3871 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width))
3872 || TREE_CODE (*width) != INTEGER_CST)
3874 error ("bit-field %qs width not an integer constant", name);
3875 *width = integer_one_node;
3879 constant_expression_warning (*width);
3880 if (tree_int_cst_sgn (*width) < 0)
3882 error ("negative width in bit-field %qs", name);
3883 *width = integer_one_node;
3885 else if (integer_zerop (*width) && orig_name)
3887 error ("zero width for bit-field %qs", name);
3888 *width = integer_one_node;
3892 /* Detect invalid bit-field type. */
3893 if (TREE_CODE (*type) != INTEGER_TYPE
3894 && TREE_CODE (*type) != BOOLEAN_TYPE
3895 && TREE_CODE (*type) != ENUMERAL_TYPE)
3897 error ("bit-field %qs has invalid type", name);
3898 *type = unsigned_type_node;
3901 type_mv = TYPE_MAIN_VARIANT (*type);
3903 && !in_system_header
3904 && type_mv != integer_type_node
3905 && type_mv != unsigned_type_node
3906 && type_mv != boolean_type_node)
3907 pedwarn ("type of bit-field %qs is a GCC extension", name);
3909 if (type_mv == boolean_type_node)
3910 max_width = CHAR_TYPE_SIZE;
3912 max_width = TYPE_PRECISION (*type);
3914 if (0 < compare_tree_int (*width, max_width))
3916 error ("width of %qs exceeds its type", name);
3918 *width = build_int_cst (NULL_TREE, w);
3921 w = tree_low_cst (*width, 1);
3923 if (TREE_CODE (*type) == ENUMERAL_TYPE)
3925 struct lang_type *lt = TYPE_LANG_SPECIFIC (*type);
3927 || w < min_precision (lt->enum_min, TYPE_UNSIGNED (*type))
3928 || w < min_precision (lt->enum_max, TYPE_UNSIGNED (*type)))
3929 warning (0, "%qs is narrower than values of its type", name);
3934 /* Given declspecs and a declarator,
3935 determine the name and type of the object declared
3936 and construct a ..._DECL node for it.
3937 (In one case we can return a ..._TYPE node instead.
3938 For invalid input we sometimes return 0.)
3940 DECLSPECS is a c_declspecs structure for the declaration specifiers.
3942 DECL_CONTEXT says which syntactic context this declaration is in:
3943 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3944 FUNCDEF for a function definition. Like NORMAL but a few different
3945 error messages in each case. Return value may be zero meaning
3946 this definition is too screwy to try to parse.
3947 PARM for a parameter declaration (either within a function prototype
3948 or before a function body). Make a PARM_DECL, or return void_type_node.
3949 TYPENAME if for a typename (in a cast or sizeof).
3950 Don't make a DECL node; just return the ..._TYPE node.
3951 FIELD for a struct or union field; make a FIELD_DECL.
3952 INITIALIZED is true if the decl has an initializer.
3953 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3954 representing the width of the bit-field.
3956 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3957 It may also be so in the PARM case, for a prototype where the
3958 argument type is specified but not the name.
3960 This function is where the complicated C meanings of `static'
3961 and `extern' are interpreted. */
3964 grokdeclarator (const struct c_declarator *declarator,
3965 struct c_declspecs *declspecs,
3966 enum decl_context decl_context, bool initialized, tree *width)
3968 tree type = declspecs->type;
3969 bool threadp = declspecs->thread_p;
3970 enum c_storage_class storage_class = declspecs->storage_class;
3974 int type_quals = TYPE_UNQUALIFIED;
3975 const char *name, *orig_name;
3976 tree typedef_type = 0;
3977 bool funcdef_flag = false;
3978 bool funcdef_syntax = false;
3979 int size_varies = 0;
3980 tree decl_attr = declspecs->decl_attr;
3981 int array_ptr_quals = TYPE_UNQUALIFIED;
3982 tree array_ptr_attrs = NULL_TREE;
3983 int array_parm_static = 0;
3984 bool array_parm_vla_unspec_p = false;
3985 tree returned_attrs = NULL_TREE;
3986 bool bitfield = width != NULL;
3988 struct c_arg_info *arg_info = 0;
3990 if (decl_context == FUNCDEF)
3991 funcdef_flag = true, decl_context = NORMAL;
3993 /* Look inside a declarator for the name being declared
3994 and get it as a string, for an error message. */
3996 const struct c_declarator *decl = declarator;
4005 funcdef_syntax = (decl->kind == cdk_function);
4006 decl = decl->declarator;
4010 decl = decl->declarator;
4015 name = IDENTIFIER_POINTER (decl->u.id);
4027 /* A function definition's declarator must have the form of
4028 a function declarator. */
4030 if (funcdef_flag && !funcdef_syntax)
4033 /* If this looks like a function definition, make it one,
4034 even if it occurs where parms are expected.
4035 Then store_parm_decls will reject it and not use it as a parm. */
4036 if (decl_context == NORMAL && !funcdef_flag && current_scope->parm_flag)
4037 decl_context = PARM;
4039 if (declspecs->deprecated_p && deprecated_state != DEPRECATED_SUPPRESS)
4040 warn_deprecated_use (declspecs->type);
4042 if ((decl_context == NORMAL || decl_context == FIELD)
4043 && current_scope == file_scope
4044 && variably_modified_type_p (type, NULL_TREE))
4046 error ("variably modified %qs at file scope", name);
4047 type = integer_type_node;
4050 typedef_type = type;
4051 size_varies = C_TYPE_VARIABLE_SIZE (type);
4053 /* Diagnose defaulting to "int". */
4055 if (declspecs->default_int_p && !in_system_header)
4057 /* Issue a warning if this is an ISO C 99 program or if
4058 -Wreturn-type and this is a function, or if -Wimplicit;
4059 prefer the former warning since it is more explicit. */
4060 if ((warn_implicit_int || warn_return_type || flag_isoc99)
4062 warn_about_return_type = 1;
4063 else if (warn_implicit_int || flag_isoc99)
4064 pedwarn_c99 ("type defaults to %<int%> in declaration of %qs", name);
4067 /* Adjust the type if a bit-field is being declared,
4068 -funsigned-bitfields applied and the type is not explicitly
4070 if (bitfield && !flag_signed_bitfields && !declspecs->explicit_signed_p
4071 && TREE_CODE (type) == INTEGER_TYPE)
4072 type = c_common_unsigned_type (type);
4074 /* Figure out the type qualifiers for the declaration. There are
4075 two ways a declaration can become qualified. One is something
4076 like `const int i' where the `const' is explicit. Another is
4077 something like `typedef const int CI; CI i' where the type of the
4078 declaration contains the `const'. A third possibility is that
4079 there is a type qualifier on the element type of a typedefed
4080 array type, in which case we should extract that qualifier so
4081 that c_apply_type_quals_to_decls receives the full list of
4082 qualifiers to work with (C90 is not entirely clear about whether
4083 duplicate qualifiers should be diagnosed in this case, but it
4084 seems most appropriate to do so). */
4085 element_type = strip_array_types (type);
4086 constp = declspecs->const_p + TYPE_READONLY (element_type);
4087 restrictp = declspecs->restrict_p + TYPE_RESTRICT (element_type);
4088 volatilep = declspecs->volatile_p + TYPE_VOLATILE (element_type);
4089 if (pedantic && !flag_isoc99)
4092 pedwarn ("duplicate %<const%>");
4094 pedwarn ("duplicate %<restrict%>");
4096 pedwarn ("duplicate %<volatile%>");
4098 if (!flag_gen_aux_info && (TYPE_QUALS (element_type)))
4099 type = TYPE_MAIN_VARIANT (type);
4100 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4101 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4102 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4104 /* Warn about storage classes that are invalid for certain
4105 kinds of declarations (parameters, typenames, etc.). */
4109 || storage_class == csc_auto
4110 || storage_class == csc_register
4111 || storage_class == csc_typedef))
4113 if (storage_class == csc_auto
4114 && (pedantic || current_scope == file_scope))
4115 pedwarn ("function definition declared %<auto%>");
4116 if (storage_class == csc_register)
4117 error ("function definition declared %<register%>");
4118 if (storage_class == csc_typedef)
4119 error ("function definition declared %<typedef%>");
4121 error ("function definition declared %<__thread%>");
4123 if (storage_class == csc_auto
4124 || storage_class == csc_register
4125 || storage_class == csc_typedef)
4126 storage_class = csc_none;
4128 else if (decl_context != NORMAL && (storage_class != csc_none || threadp))
4130 if (decl_context == PARM && storage_class == csc_register)
4134 switch (decl_context)
4137 error ("storage class specified for structure field %qs",
4141 error ("storage class specified for parameter %qs", name);
4144 error ("storage class specified for typename");
4147 storage_class = csc_none;
4151 else if (storage_class == csc_extern
4155 /* 'extern' with initialization is invalid if not at file scope. */
4156 if (current_scope == file_scope)
4158 /* It is fine to have 'extern const' when compiling at C
4159 and C++ intersection. */
4160 if (!(warn_cxx_compat && constp))
4161 warning (0, "%qs initialized and declared %<extern%>", name);
4164 error ("%qs has both %<extern%> and initializer", name);
4166 else if (current_scope == file_scope)
4168 if (storage_class == csc_auto)
4169 error ("file-scope declaration of %qs specifies %<auto%>", name);
4170 if (pedantic && storage_class == csc_register)
4171 pedwarn ("file-scope declaration of %qs specifies %<register%>", name);
4175 if (storage_class == csc_extern && funcdef_flag)
4176 error ("nested function %qs declared %<extern%>", name);
4177 else if (threadp && storage_class == csc_none)
4179 error ("function-scope %qs implicitly auto and declared "
4186 /* Now figure out the structure of the declarator proper.
4187 Descend through it, creating more complex types, until we reach
4188 the declared identifier (or NULL_TREE, in an absolute declarator).
4189 At each stage we maintain an unqualified version of the type
4190 together with any qualifiers that should be applied to it with
4191 c_build_qualified_type; this way, array types including
4192 multidimensional array types are first built up in unqualified
4193 form and then the qualified form is created with
4194 TYPE_MAIN_VARIANT pointing to the unqualified form. */
4196 while (declarator && declarator->kind != cdk_id)
4198 if (type == error_mark_node)
4200 declarator = declarator->declarator;
4204 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
4205 a cdk_pointer (for *...),
4206 a cdk_function (for ...(...)),
4207 a cdk_attrs (for nested attributes),
4208 or a cdk_id (for the name being declared
4209 or the place in an absolute declarator
4210 where the name was omitted).
4211 For the last case, we have just exited the loop.
4213 At this point, TYPE is the type of elements of an array,
4214 or for a function to return, or for a pointer to point to.
4215 After this sequence of ifs, TYPE is the type of the
4216 array or function or pointer, and DECLARATOR has had its
4217 outermost layer removed. */
4219 if (array_ptr_quals != TYPE_UNQUALIFIED
4220 || array_ptr_attrs != NULL_TREE
4221 || array_parm_static)
4223 /* Only the innermost declarator (making a parameter be of
4224 array type which is converted to pointer type)
4225 may have static or type qualifiers. */
4226 error ("static or type qualifiers in non-parameter array declarator");
4227 array_ptr_quals = TYPE_UNQUALIFIED;
4228 array_ptr_attrs = NULL_TREE;
4229 array_parm_static = 0;
4232 switch (declarator->kind)
4236 /* A declarator with embedded attributes. */
4237 tree attrs = declarator->u.attrs;
4238 const struct c_declarator *inner_decl;
4240 declarator = declarator->declarator;
4241 inner_decl = declarator;
4242 while (inner_decl->kind == cdk_attrs)
4243 inner_decl = inner_decl->declarator;
4244 if (inner_decl->kind == cdk_id)
4245 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4246 else if (inner_decl->kind == cdk_function)
4247 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4248 else if (inner_decl->kind == cdk_array)
4249 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4250 returned_attrs = decl_attributes (&type,
4251 chainon (returned_attrs, attrs),
4257 tree itype = NULL_TREE;
4258 tree size = declarator->u.array.dimen;
4259 /* The index is a signed object `sizetype' bits wide. */
4260 tree index_type = c_common_signed_type (sizetype);
4262 array_ptr_quals = declarator->u.array.quals;
4263 array_ptr_attrs = declarator->u.array.attrs;
4264 array_parm_static = declarator->u.array.static_p;
4265 array_parm_vla_unspec_p = declarator->u.array.vla_unspec_p;
4267 declarator = declarator->declarator;
4269 /* Check for some types that there cannot be arrays of. */
4271 if (VOID_TYPE_P (type))
4273 error ("declaration of %qs as array of voids", name);
4274 type = error_mark_node;
4277 if (TREE_CODE (type) == FUNCTION_TYPE)
4279 error ("declaration of %qs as array of functions", name);
4280 type = error_mark_node;
4283 if (pedantic && !in_system_header && flexible_array_type_p (type))
4284 pedwarn ("invalid use of structure with flexible array member");
4286 if (size == error_mark_node)
4287 type = error_mark_node;
4289 if (type == error_mark_node)
4292 /* If size was specified, set ITYPE to a range-type for
4293 that size. Otherwise, ITYPE remains null. finish_decl
4294 may figure it out from an initial value. */
4298 /* Strip NON_LVALUE_EXPRs since we aren't using as an
4300 STRIP_TYPE_NOPS (size);
4302 if (!INTEGRAL_TYPE_P (TREE_TYPE (size)))
4304 error ("size of array %qs has non-integer type", name);
4305 size = integer_one_node;
4308 if (pedantic && integer_zerop (size))
4309 pedwarn ("ISO C forbids zero-size array %qs", name);
4311 if (TREE_CODE (size) == INTEGER_CST)
4313 constant_expression_warning (size);
4314 if (tree_int_cst_sgn (size) < 0)
4316 error ("size of array %qs is negative", name);
4317 size = integer_one_node;
4320 else if ((decl_context == NORMAL || decl_context == FIELD)
4321 && current_scope == file_scope)
4323 error ("variably modified %qs at file scope", name);
4324 size = integer_one_node;
4328 /* Make sure the array size remains visibly
4329 nonconstant even if it is (eg) a const variable
4330 with known value. */
4333 if (!flag_isoc99 && pedantic)
4335 if (TREE_CONSTANT (size))
4336 pedwarn ("ISO C90 forbids array %qs whose size "
4337 "can%'t be evaluated",
4340 pedwarn ("ISO C90 forbids variable-size array %qs",
4345 if (integer_zerop (size))
4347 /* A zero-length array cannot be represented with
4348 an unsigned index type, which is what we'll
4349 get with build_index_type. Create an
4350 open-ended range instead. */
4351 itype = build_range_type (sizetype, size, NULL_TREE);
4355 /* Arrange for the SAVE_EXPR on the inside of the
4356 MINUS_EXPR, which allows the -1 to get folded
4357 with the +1 that happens when building TYPE_SIZE. */
4359 size = variable_size (size);
4361 /* Compute the maximum valid index, that is, size
4362 - 1. Do the calculation in index_type, so that
4363 if it is a variable the computations will be
4364 done in the proper mode. */
4365 itype = fold_build2 (MINUS_EXPR, index_type,
4366 convert (index_type, size),
4367 convert (index_type,
4370 /* If that overflowed, the array is too big. ???
4371 While a size of INT_MAX+1 technically shouldn't
4372 cause an overflow (because we subtract 1), the
4373 overflow is recorded during the conversion to
4374 index_type, before the subtraction. Handling
4375 this case seems like an unnecessary
4377 if (TREE_CODE (itype) == INTEGER_CST
4378 && TREE_OVERFLOW (itype))
4380 error ("size of array %qs is too large", name);
4381 type = error_mark_node;
4385 itype = build_index_type (itype);
4388 else if (decl_context == FIELD)
4390 if (pedantic && !flag_isoc99 && !in_system_header)
4391 pedwarn ("ISO C90 does not support flexible array members");
4393 /* ISO C99 Flexible array members are effectively
4394 identical to GCC's zero-length array extension. */
4395 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4397 else if (decl_context == PARM)
4399 if (array_parm_vla_unspec_p)
4404 error ("%<[*]%> not allowed in other than a declaration");
4407 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4411 else if (decl_context == TYPENAME)
4413 if (array_parm_vla_unspec_p)
4415 /* The error is printed elsewhere. We use this to
4416 avoid messing up with incomplete array types of
4417 the same type, that would otherwise be modified
4419 itype = build_range_type (sizetype, size_zero_node,
4424 /* Complain about arrays of incomplete types. */
4425 if (!COMPLETE_TYPE_P (type))
4427 error ("array type has incomplete element type");
4428 type = error_mark_node;
4431 /* When itype is NULL, a shared incomplete array type is
4432 returned for all array of a given type. Elsewhere we
4433 make sure we don't complete that type before copying
4434 it, but here we want to make sure we don't ever
4435 modify the shared type, so we gcc_assert (itype)
4437 type = build_array_type (type, itype);
4439 if (type != error_mark_node)
4443 /* It is ok to modify type here even if itype is
4444 NULL: if size_varies, we're in a
4445 multi-dimensional array and the inner type has
4446 variable size, so the enclosing shared array type
4448 if (size && TREE_CODE (size) == INTEGER_CST)
4450 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type));
4451 C_TYPE_VARIABLE_SIZE (type) = 1;
4454 /* The GCC extension for zero-length arrays differs from
4455 ISO flexible array members in that sizeof yields
4457 if (size && integer_zerop (size))
4460 TYPE_SIZE (type) = bitsize_zero_node;
4461 TYPE_SIZE_UNIT (type) = size_zero_node;
4463 if (array_parm_vla_unspec_p)
4466 /* The type is complete. C99 6.7.5.2p4 */
4467 TYPE_SIZE (type) = bitsize_zero_node;
4468 TYPE_SIZE_UNIT (type) = size_zero_node;
4472 if (decl_context != PARM
4473 && (array_ptr_quals != TYPE_UNQUALIFIED
4474 || array_ptr_attrs != NULL_TREE
4475 || array_parm_static))
4477 error ("static or type qualifiers in non-parameter array declarator");
4478 array_ptr_quals = TYPE_UNQUALIFIED;
4479 array_ptr_attrs = NULL_TREE;
4480 array_parm_static = 0;
4486 /* Say it's a definition only for the declarator closest
4487 to the identifier, apart possibly from some
4489 bool really_funcdef = false;
4493 const struct c_declarator *t = declarator->declarator;
4494 while (t->kind == cdk_attrs)
4496 really_funcdef = (t->kind == cdk_id);
4499 /* Declaring a function type. Make sure we have a valid
4500 type for the function to return. */
4501 if (type == error_mark_node)
4506 /* Warn about some types functions can't return. */
4507 if (TREE_CODE (type) == FUNCTION_TYPE)
4509 error ("%qs declared as function returning a function", name);
4510 type = integer_type_node;
4512 if (TREE_CODE (type) == ARRAY_TYPE)
4514 error ("%qs declared as function returning an array", name);
4515 type = integer_type_node;
4518 /* Construct the function type and go to the next
4519 inner layer of declarator. */
4520 arg_info = declarator->u.arg_info;
4521 arg_types = grokparms (arg_info, really_funcdef);
4523 put_pending_sizes (arg_info->pending_sizes);
4525 /* Type qualifiers before the return type of the function
4526 qualify the return type, not the function type. */
4529 /* Type qualifiers on a function return type are
4530 normally permitted by the standard but have no
4531 effect, so give a warning at -Wreturn-type.
4532 Qualifiers on a void return type are banned on
4533 function definitions in ISO C; GCC used to used
4534 them for noreturn functions. */
4535 if (VOID_TYPE_P (type) && really_funcdef)
4536 pedwarn ("function definition has qualified void return type");
4538 warning (OPT_Wreturn_type,
4539 "type qualifiers ignored on function return type");
4541 type = c_build_qualified_type (type, type_quals);
4543 type_quals = TYPE_UNQUALIFIED;
4545 type = build_function_type (type, arg_types);
4546 declarator = declarator->declarator;
4548 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4549 the formal parameter list of this FUNCTION_TYPE to point to
4550 the FUNCTION_TYPE node itself. */
4554 for (link = arg_info->tags;
4556 link = TREE_CHAIN (link))
4557 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4563 /* Merge any constancy or volatility into the target type
4566 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4568 pedwarn ("ISO C forbids qualified function types");
4570 type = c_build_qualified_type (type, type_quals);
4573 /* When the pointed-to type involves components of variable size,
4574 care must be taken to ensure that the size evaluation code is
4575 emitted early enough to dominate all the possible later uses
4576 and late enough for the variables on which it depends to have
4579 This is expected to happen automatically when the pointed-to
4580 type has a name/declaration of it's own, but special attention
4581 is required if the type is anonymous.
4583 We handle the NORMAL and FIELD contexts here by attaching an
4584 artificial TYPE_DECL to such pointed-to type. This forces the
4585 sizes evaluation at a safe point and ensures it is not deferred
4586 until e.g. within a deeper conditional context.
4588 We expect nothing to be needed here for PARM or TYPENAME.
4589 Pushing a TYPE_DECL at this point for TYPENAME would actually
4590 be incorrect, as we might be in the middle of an expression
4591 with side effects on the pointed-to type size "arguments" prior
4592 to the pointer declaration point and the fake TYPE_DECL in the
4593 enclosing context would force the size evaluation prior to the
4596 if (!TYPE_NAME (type)
4597 && (decl_context == NORMAL || decl_context == FIELD)
4598 && variably_modified_type_p (type, NULL_TREE))
4600 tree decl = build_decl (TYPE_DECL, NULL_TREE, type);
4601 DECL_ARTIFICIAL (decl) = 1;
4603 finish_decl (decl, NULL_TREE, NULL_TREE);
4604 TYPE_NAME (type) = decl;
4607 type = build_pointer_type (type);
4609 /* Process type qualifiers (such as const or volatile)
4610 that were given inside the `*'. */
4611 type_quals = declarator->u.pointer_quals;
4613 declarator = declarator->declarator;
4621 /* Now TYPE has the actual type, apart from any qualifiers in
4624 /* Check the type and width of a bit-field. */
4626 check_bitfield_type_and_width (&type, width, orig_name);
4628 /* Did array size calculations overflow? */
4630 if (TREE_CODE (type) == ARRAY_TYPE
4631 && COMPLETE_TYPE_P (type)
4632 && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST
4633 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type)))
4635 error ("size of array %qs is too large", name);
4636 /* If we proceed with the array type as it is, we'll eventually
4637 crash in tree_low_cst(). */
4638 type = error_mark_node;
4641 /* If this is declaring a typedef name, return a TYPE_DECL. */
4643 if (storage_class == csc_typedef)
4646 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4648 pedwarn ("ISO C forbids qualified function types");
4650 type = c_build_qualified_type (type, type_quals);
4651 decl = build_decl (TYPE_DECL, declarator->u.id, type);
4652 if (declspecs->explicit_signed_p)
4653 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4654 decl_attributes (&decl, returned_attrs, 0);
4655 if (declspecs->inline_p)
4656 pedwarn ("typedef %q+D declared %<inline%>", decl);
4660 /* If this is a type name (such as, in a cast or sizeof),
4661 compute the type and return it now. */
4663 if (decl_context == TYPENAME)
4665 /* Note that the grammar rejects storage classes in typenames
4667 gcc_assert (storage_class == csc_none && !threadp
4668 && !declspecs->inline_p);
4669 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4671 pedwarn ("ISO C forbids const or volatile function types");
4673 type = c_build_qualified_type (type, type_quals);
4674 decl_attributes (&type, returned_attrs, 0);
4678 if (pedantic && decl_context == FIELD
4679 && variably_modified_type_p (type, NULL_TREE))
4682 pedwarn ("a member of a structure or union cannot have a variably modified type");
4685 /* Aside from typedefs and type names (handle above),
4686 `void' at top level (not within pointer)
4687 is allowed only in public variables.
4688 We don't complain about parms either, but that is because
4689 a better error message can be made later. */
4691 if (VOID_TYPE_P (type) && decl_context != PARM
4692 && !((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4693 && (storage_class == csc_extern
4694 || (current_scope == file_scope
4695 && !(storage_class == csc_static
4696 || storage_class == csc_register)))))
4698 error ("variable or field %qs declared void", name);
4699 type = integer_type_node;
4702 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4703 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4708 if (decl_context == PARM)
4710 tree type_as_written;
4713 /* A parameter declared as an array of T is really a pointer to T.
4714 One declared as a function is really a pointer to a function. */
4716 if (TREE_CODE (type) == ARRAY_TYPE)
4718 /* Transfer const-ness of array into that of type pointed to. */
4719 type = TREE_TYPE (type);
4721 type = c_build_qualified_type (type, type_quals);
4722 type = build_pointer_type (type);
4723 type_quals = array_ptr_quals;
4725 /* We don't yet implement attributes in this context. */
4726 if (array_ptr_attrs != NULL_TREE)
4727 warning (OPT_Wattributes,
4728 "attributes in parameter array declarator ignored");
4732 else if (TREE_CODE (type) == FUNCTION_TYPE)
4734 if (pedantic && type_quals)
4735 pedwarn ("ISO C forbids qualified function types");
4737 type = c_build_qualified_type (type, type_quals);
4738 type = build_pointer_type (type);
4739 type_quals = TYPE_UNQUALIFIED;
4741 else if (type_quals)
4742 type = c_build_qualified_type (type, type_quals);
4744 type_as_written = type;
4746 decl = build_decl (PARM_DECL, declarator->u.id, type);
4748 C_DECL_VARIABLE_SIZE (decl) = 1;
4750 /* Compute the type actually passed in the parmlist,
4751 for the case where there is no prototype.
4752 (For example, shorts and chars are passed as ints.)
4753 When there is a prototype, this is overridden later. */
4755 if (type == error_mark_node)
4756 promoted_type = type;
4758 promoted_type = c_type_promotes_to (type);
4760 DECL_ARG_TYPE (decl) = promoted_type;
4761 if (declspecs->inline_p)
4762 pedwarn ("parameter %q+D declared %<inline%>", decl);
4764 else if (decl_context == FIELD)
4766 /* Note that the grammar rejects storage classes in typenames
4768 gcc_assert (storage_class == csc_none && !threadp
4769 && !declspecs->inline_p);
4771 /* Structure field. It may not be a function. */
4773 if (TREE_CODE (type) == FUNCTION_TYPE)
4775 error ("field %qs declared as a function", name);
4776 type = build_pointer_type (type);
4778 else if (TREE_CODE (type) != ERROR_MARK
4779 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4781 error ("field %qs has incomplete type", name);
4782 type = error_mark_node;
4784 type = c_build_qualified_type (type, type_quals);
4785 decl = build_decl (FIELD_DECL, declarator->u.id, type);
4786 DECL_NONADDRESSABLE_P (decl) = bitfield;
4789 C_DECL_VARIABLE_SIZE (decl) = 1;
4791 else if (TREE_CODE (type) == FUNCTION_TYPE)
4793 if (storage_class == csc_register || threadp)
4795 error ("invalid storage class for function %qs", name);
4797 else if (current_scope != file_scope)
4799 /* Function declaration not at file scope. Storage
4800 classes other than `extern' are not allowed, C99
4801 6.7.1p5, and `extern' makes no difference. However,
4802 GCC allows 'auto', perhaps with 'inline', to support
4803 nested functions. */
4804 if (storage_class == csc_auto)
4807 pedwarn ("invalid storage class for function %qs", name);
4809 else if (storage_class == csc_static)
4811 error ("invalid storage class for function %qs", name);
4813 storage_class = declspecs->storage_class = csc_none;
4819 decl = build_decl (FUNCTION_DECL, declarator->u.id, type);
4820 decl = build_decl_attribute_variant (decl, decl_attr);
4822 DECL_LANG_SPECIFIC (decl) = GGC_CNEW (struct lang_decl);
4824 if (pedantic && type_quals && !DECL_IN_SYSTEM_HEADER (decl))
4825 pedwarn ("ISO C forbids qualified function types");
4827 /* GNU C interprets a volatile-qualified function type to indicate
4828 that the function does not return. */
4829 if ((type_quals & TYPE_QUAL_VOLATILE)
4830 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4831 warning (0, "%<noreturn%> function returns non-void value");
4833 /* Every function declaration is an external reference
4834 (DECL_EXTERNAL) except for those which are not at file
4835 scope and are explicitly declared "auto". This is
4836 forbidden by standard C (C99 6.7.1p5) and is interpreted by
4837 GCC to signify a forward declaration of a nested function. */
4838 if (storage_class == csc_auto && current_scope != file_scope)
4839 DECL_EXTERNAL (decl) = 0;
4840 /* In C99, a function which is declared 'inline' with 'extern'
4841 is not an external reference (which is confusing). It
4842 means that the later definition of the function must be output
4843 in this file, C99 6.7.4p6. In GNU C89, a function declared
4844 'extern inline' is an external reference. */
4845 else if (declspecs->inline_p && storage_class != csc_static)
4846 DECL_EXTERNAL (decl) = ((storage_class == csc_extern)
4847 == flag_gnu89_inline);
4849 DECL_EXTERNAL (decl) = !initialized;
4851 /* Record absence of global scope for `static' or `auto'. */
4853 = !(storage_class == csc_static || storage_class == csc_auto);
4855 /* For a function definition, record the argument information
4856 block where store_parm_decls will look for it. */
4858 current_function_arg_info = arg_info;
4860 if (declspecs->default_int_p)
4861 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4863 /* Record presence of `inline', if it is reasonable. */
4864 if (flag_hosted && MAIN_NAME_P (declarator->u.id))
4866 if (declspecs->inline_p)
4867 pedwarn ("cannot inline function %<main%>");
4869 else if (declspecs->inline_p)
4871 /* Record that the function is declared `inline'. */
4872 DECL_DECLARED_INLINE_P (decl) = 1;
4874 /* Do not mark bare declarations as DECL_INLINE. Doing so
4875 in the presence of multiple declarations can result in
4876 the abstract origin pointing between the declarations,
4877 which will confuse dwarf2out. */
4879 DECL_INLINE (decl) = 1;
4881 /* If -finline-functions, assume it can be inlined. This does
4882 two things: let the function be deferred until it is actually
4883 needed, and let dwarf2 know that the function is inlinable. */
4884 else if (flag_inline_trees == 2 && initialized)
4885 DECL_INLINE (decl) = 1;
4889 /* It's a variable. */
4890 /* An uninitialized decl with `extern' is a reference. */
4891 int extern_ref = !initialized && storage_class == csc_extern;
4893 type = c_build_qualified_type (type, type_quals);
4895 /* C99 6.2.2p7: It is invalid (compile-time undefined
4896 behavior) to create an 'extern' declaration for a
4897 variable if there is a global declaration that is
4898 'static' and the global declaration is not visible.
4899 (If the static declaration _is_ currently visible,
4900 the 'extern' declaration is taken to refer to that decl.) */
4901 if (extern_ref && current_scope != file_scope)
4903 tree global_decl = identifier_global_value (declarator->u.id);
4904 tree visible_decl = lookup_name (declarator->u.id);
4907 && global_decl != visible_decl
4908 && TREE_CODE (global_decl) == VAR_DECL
4909 && !TREE_PUBLIC (global_decl))
4910 error ("variable previously declared %<static%> redeclared "
4914 decl = build_decl (VAR_DECL, declarator->u.id, type);
4915 DECL_SOURCE_LOCATION (decl) = declarator->id_loc;
4917 C_DECL_VARIABLE_SIZE (decl) = 1;
4919 if (declspecs->inline_p)
4920 pedwarn ("variable %q+D declared %<inline%>", decl);
4922 /* At file scope, an initialized extern declaration may follow
4923 a static declaration. In that case, DECL_EXTERNAL will be
4924 reset later in start_decl. */
4925 DECL_EXTERNAL (decl) = (storage_class == csc_extern);
4927 /* At file scope, the presence of a `static' or `register' storage
4928 class specifier, or the absence of all storage class specifiers
4929 makes this declaration a definition (perhaps tentative). Also,
4930 the absence of `static' makes it public. */
4931 if (current_scope == file_scope)
4933 TREE_PUBLIC (decl) = storage_class != csc_static;
4934 TREE_STATIC (decl) = !extern_ref;
4936 /* Not at file scope, only `static' makes a static definition. */
4939 TREE_STATIC (decl) = (storage_class == csc_static);
4940 TREE_PUBLIC (decl) = extern_ref;
4945 if (targetm.have_tls)
4946 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
4948 /* A mere warning is sure to result in improper semantics
4949 at runtime. Don't bother to allow this to compile. */
4950 error ("thread-local storage not supported for this target");
4954 if (storage_class == csc_extern
4955 && variably_modified_type_p (type, NULL_TREE))
4958 error ("object with variably modified type must have no linkage");
4961 /* Record `register' declaration for warnings on &
4962 and in case doing stupid register allocation. */
4964 if (storage_class == csc_register)
4966 C_DECL_REGISTER (decl) = 1;
4967 DECL_REGISTER (decl) = 1;
4970 /* Record constancy and volatility. */
4971 c_apply_type_quals_to_decl (type_quals, decl);
4973 /* If a type has volatile components, it should be stored in memory.
4974 Otherwise, the fact that those components are volatile
4975 will be ignored, and would even crash the compiler.
4976 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
4977 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl))
4978 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL
4979 || TREE_CODE (decl) == RESULT_DECL))
4981 /* It is not an error for a structure with volatile fields to
4982 be declared register, but reset DECL_REGISTER since it
4983 cannot actually go in a register. */
4984 int was_reg = C_DECL_REGISTER (decl);
4985 C_DECL_REGISTER (decl) = 0;
4986 DECL_REGISTER (decl) = 0;
4987 c_mark_addressable (decl);
4988 C_DECL_REGISTER (decl) = was_reg;
4991 /* This is the earliest point at which we might know the assembler
4992 name of a variable. Thus, if it's known before this, die horribly. */
4993 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl));
4995 decl_attributes (&decl, returned_attrs, 0);
5001 /* Decode the parameter-list info for a function type or function definition.
5002 The argument is the value returned by `get_parm_info' (or made in c-parse.c
5003 if there is an identifier list instead of a parameter decl list).
5004 These two functions are separate because when a function returns
5005 or receives functions then each is called multiple times but the order
5006 of calls is different. The last call to `grokparms' is always the one
5007 that contains the formal parameter names of a function definition.
5009 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5011 FUNCDEF_FLAG is true for a function definition, false for
5012 a mere declaration. A nonempty identifier-list gets an error message
5013 when FUNCDEF_FLAG is false. */
5016 grokparms (struct c_arg_info *arg_info, bool funcdef_flag)
5018 tree arg_types = arg_info->types;
5020 if (funcdef_flag && arg_info->had_vla_unspec)
5022 /* A function definition isn't function prototype scope C99 6.2.1p4. */
5024 error ("%<[*]%> not allowed in other than function prototype scope");
5027 if (arg_types == 0 && !funcdef_flag && !in_system_header)
5028 warning (OPT_Wstrict_prototypes,
5029 "function declaration isn%'t a prototype");
5031 if (arg_types == error_mark_node)
5032 return 0; /* don't set TYPE_ARG_TYPES in this case */
5034 else if (arg_types && TREE_CODE (TREE_VALUE (arg_types)) == IDENTIFIER_NODE)
5037 pedwarn ("parameter names (without types) in function declaration");
5039 arg_info->parms = arg_info->types;
5040 arg_info->types = 0;
5045 tree parm, type, typelt;
5046 unsigned int parmno;
5048 /* If there is a parameter of incomplete type in a definition,
5049 this is an error. In a declaration this is valid, and a
5050 struct or union type may be completed later, before any calls
5051 or definition of the function. In the case where the tag was
5052 first declared within the parameter list, a warning has
5053 already been given. If a parameter has void type, then
5054 however the function cannot be defined or called, so
5057 for (parm = arg_info->parms, typelt = arg_types, parmno = 1;
5059 parm = TREE_CHAIN (parm), typelt = TREE_CHAIN (typelt), parmno++)
5061 type = TREE_VALUE (typelt);
5062 if (type == error_mark_node)
5065 if (!COMPLETE_TYPE_P (type))
5069 if (DECL_NAME (parm))
5070 error ("parameter %u (%q+D) has incomplete type",
5073 error ("%Jparameter %u has incomplete type",
5076 TREE_VALUE (typelt) = error_mark_node;
5077 TREE_TYPE (parm) = error_mark_node;
5079 else if (VOID_TYPE_P (type))
5081 if (DECL_NAME (parm))
5082 warning (0, "parameter %u (%q+D) has void type",
5085 warning (0, "%Jparameter %u has void type",
5090 if (DECL_NAME (parm) && TREE_USED (parm))
5091 warn_if_shadowing (parm);
5097 /* Take apart the current scope and return a c_arg_info structure with
5098 info on a parameter list just parsed.
5100 This structure is later fed to 'grokparms' and 'store_parm_decls'.
5102 ELLIPSIS being true means the argument list ended in '...' so don't
5103 append a sentinel (void_list_node) to the end of the type-list. */
5106 get_parm_info (bool ellipsis)
5108 struct c_binding *b = current_scope->bindings;
5109 struct c_arg_info *arg_info = XOBNEW (&parser_obstack,
5116 static bool explained_incomplete_types = false;
5117 bool gave_void_only_once_err = false;
5119 arg_info->parms = 0;
5121 arg_info->types = 0;
5122 arg_info->others = 0;
5123 arg_info->pending_sizes = 0;
5124 arg_info->had_vla_unspec = current_scope->had_vla_unspec;
5126 /* The bindings in this scope must not get put into a block.
5127 We will take care of deleting the binding nodes. */
5128 current_scope->bindings = 0;
5130 /* This function is only called if there was *something* on the
5134 /* A parameter list consisting solely of 'void' indicates that the
5135 function takes no arguments. But if the 'void' is qualified
5136 (by 'const' or 'volatile'), or has a storage class specifier
5137 ('register'), then the behavior is undefined; issue an error.
5138 Typedefs for 'void' are OK (see DR#157). */
5139 if (b->prev == 0 /* one binding */
5140 && TREE_CODE (b->decl) == PARM_DECL /* which is a parameter */
5141 && !DECL_NAME (b->decl) /* anonymous */
5142 && VOID_TYPE_P (TREE_TYPE (b->decl))) /* of void type */
5144 if (TREE_THIS_VOLATILE (b->decl)
5145 || TREE_READONLY (b->decl)
5146 || C_DECL_REGISTER (b->decl))
5147 error ("%<void%> as only parameter may not be qualified");
5149 /* There cannot be an ellipsis. */
5151 error ("%<void%> must be the only parameter");
5153 arg_info->types = void_list_node;
5158 types = void_list_node;
5160 /* Break up the bindings list into parms, tags, types, and others;
5161 apply sanity checks; purge the name-to-decl bindings. */
5164 tree decl = b->decl;
5165 tree type = TREE_TYPE (decl);
5166 const char *keyword;
5168 switch (TREE_CODE (decl))
5173 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
5174 I_SYMBOL_BINDING (b->id) = b->shadowed;
5177 /* Check for forward decls that never got their actual decl. */
5178 if (TREE_ASM_WRITTEN (decl))
5179 error ("parameter %q+D has just a forward declaration", decl);
5180 /* Check for (..., void, ...) and issue an error. */
5181 else if (VOID_TYPE_P (type) && !DECL_NAME (decl))
5183 if (!gave_void_only_once_err)
5185 error ("%<void%> must be the only parameter");
5186 gave_void_only_once_err = true;
5191 /* Valid parameter, add it to the list. */
5192 TREE_CHAIN (decl) = parms;
5195 /* Since there is a prototype, args are passed in their
5196 declared types. The back end may override this later. */
5197 DECL_ARG_TYPE (decl) = type;
5198 types = tree_cons (0, type, types);
5202 case ENUMERAL_TYPE: keyword = "enum"; goto tag;
5203 case UNION_TYPE: keyword = "union"; goto tag;
5204 case RECORD_TYPE: keyword = "struct"; goto tag;
5206 /* Types may not have tag-names, in which case the type
5207 appears in the bindings list with b->id NULL. */
5210 gcc_assert (I_TAG_BINDING (b->id) == b);
5211 I_TAG_BINDING (b->id) = b->shadowed;
5214 /* Warn about any struct, union or enum tags defined in a
5215 parameter list. The scope of such types is limited to
5216 the parameter list, which is rarely if ever desirable
5217 (it's impossible to call such a function with type-
5218 correct arguments). An anonymous union parm type is
5219 meaningful as a GNU extension, so don't warn for that. */
5220 if (TREE_CODE (decl) != UNION_TYPE || b->id != 0)
5223 /* The %s will be one of 'struct', 'union', or 'enum'. */
5224 warning (0, "%<%s %E%> declared inside parameter list",
5227 /* The %s will be one of 'struct', 'union', or 'enum'. */
5228 warning (0, "anonymous %s declared inside parameter list",
5231 if (!explained_incomplete_types)
5233 warning (0, "its scope is only this definition or declaration,"
5234 " which is probably not what you want");
5235 explained_incomplete_types = true;
5239 tags = tree_cons (b->id, decl, tags);
5245 /* CONST_DECLs appear here when we have an embedded enum,
5246 and TYPE_DECLs appear here when we have an embedded struct
5247 or union. No warnings for this - we already warned about the
5248 type itself. FUNCTION_DECLs appear when there is an implicit
5249 function declaration in the parameter list. */
5251 TREE_CHAIN (decl) = others;
5256 /* error_mark_node appears here when we have an undeclared
5257 variable. Just throw it away. */
5260 gcc_assert (I_SYMBOL_BINDING (b->id) == b);
5261 I_SYMBOL_BINDING (b->id) = b->shadowed;
5265 /* Other things that might be encountered. */
5272 b = free_binding_and_advance (b);
5275 arg_info->parms = parms;
5276 arg_info->tags = tags;
5277 arg_info->types = types;
5278 arg_info->others = others;
5279 arg_info->pending_sizes = get_pending_sizes ();
5283 /* Get the struct, enum or union (CODE says which) with tag NAME.
5284 Define the tag as a forward-reference if it is not defined.
5285 Return a c_typespec structure for the type specifier. */
5288 parser_xref_tag (enum tree_code code, tree name)
5290 struct c_typespec ret;
5291 /* If a cross reference is requested, look up the type
5292 already defined for this tag and return it. */
5294 tree ref = lookup_tag (code, name, 0);
5295 /* If this is the right type of tag, return what we found.
5296 (This reference will be shadowed by shadow_tag later if appropriate.)
5297 If this is the wrong type of tag, do not return it. If it was the
5298 wrong type in the same scope, we will have had an error
5299 message already; if in a different scope and declaring
5300 a name, pending_xref_error will give an error message; but if in a
5301 different scope and not declaring a name, this tag should
5302 shadow the previous declaration of a different type of tag, and
5303 this would not work properly if we return the reference found.
5304 (For example, with "struct foo" in an outer scope, "union foo;"
5305 must shadow that tag with a new one of union type.) */
5306 ret.kind = (ref ? ctsk_tagref : ctsk_tagfirstref);
5307 if (ref && TREE_CODE (ref) == code)
5313 /* If no such tag is yet defined, create a forward-reference node
5314 and record it as the "definition".
5315 When a real declaration of this type is found,
5316 the forward-reference will be altered into a real type. */
5318 ref = make_node (code);
5319 if (code == ENUMERAL_TYPE)
5321 /* Give the type a default layout like unsigned int
5322 to avoid crashing if it does not get defined. */
5323 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5324 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5325 TYPE_USER_ALIGN (ref) = 0;
5326 TYPE_UNSIGNED (ref) = 1;
5327 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5328 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5329 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5332 pushtag (name, ref);
5338 /* Get the struct, enum or union (CODE says which) with tag NAME.
5339 Define the tag as a forward-reference if it is not defined.
5340 Return a tree for the type. */
5343 xref_tag (enum tree_code code, tree name)
5345 return parser_xref_tag (code, name).spec;
5348 /* Make sure that the tag NAME is defined *in the current scope*
5349 at least as a forward reference.
5350 CODE says which kind of tag NAME ought to be. */
5353 start_struct (enum tree_code code, tree name)
5355 /* If there is already a tag defined at this scope
5356 (as a forward reference), just return it. */
5361 ref = lookup_tag (code, name, 1);
5362 if (ref && TREE_CODE (ref) == code)
5364 if (TYPE_SIZE (ref))
5366 if (code == UNION_TYPE)
5367 error ("redefinition of %<union %E%>", name);
5369 error ("redefinition of %<struct %E%>", name);
5371 else if (C_TYPE_BEING_DEFINED (ref))
5373 if (code == UNION_TYPE)
5374 error ("nested redefinition of %<union %E%>", name);
5376 error ("nested redefinition of %<struct %E%>", name);
5377 /* Don't create structures that contain themselves. */
5382 /* Otherwise create a forward-reference just so the tag is in scope. */
5384 if (ref == NULL_TREE || TREE_CODE (ref) != code)
5386 ref = make_node (code);
5387 pushtag (name, ref);
5390 C_TYPE_BEING_DEFINED (ref) = 1;
5391 TYPE_PACKED (ref) = flag_pack_struct;
5395 /* Process the specs, declarator and width (NULL if omitted)
5396 of a structure component, returning a FIELD_DECL node.
5397 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
5399 This is done during the parsing of the struct declaration.
5400 The FIELD_DECL nodes are chained together and the lot of them
5401 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5404 grokfield (struct c_declarator *declarator, struct c_declspecs *declspecs,
5409 if (declarator->kind == cdk_id && declarator->u.id == NULL_TREE
5410 && width == NULL_TREE)
5412 /* This is an unnamed decl.
5414 If we have something of the form "union { list } ;" then this
5415 is the anonymous union extension. Similarly for struct.
5417 If this is something of the form "struct foo;", then
5418 If MS extensions are enabled, this is handled as an
5420 Otherwise this is a forward declaration of a structure tag.
5422 If this is something of the form "foo;" and foo is a TYPE_DECL, then
5423 If MS extensions are enabled and foo names a structure, then
5424 again this is an anonymous struct.
5425 Otherwise this is an error.
5427 Oh what a horrid tangled web we weave. I wonder if MS consciously
5428 took this from Plan 9 or if it was an accident of implementation
5429 that took root before someone noticed the bug... */
5431 tree type = declspecs->type;
5432 bool type_ok = (TREE_CODE (type) == RECORD_TYPE
5433 || TREE_CODE (type) == UNION_TYPE);
5437 && (flag_ms_extensions || !declspecs->typedef_p))
5439 if (flag_ms_extensions)
5443 else if (TYPE_NAME (type) == NULL)
5450 pedwarn ("declaration does not declare anything");
5454 pedwarn ("ISO C doesn%'t support unnamed structs/unions");
5457 value = grokdeclarator (declarator, declspecs, FIELD, false,
5458 width ? &width : NULL);
5460 finish_decl (value, NULL_TREE, NULL_TREE);
5461 DECL_INITIAL (value) = width;
5466 /* Generate an error for any duplicate field names in FIELDLIST. Munge
5467 the list such that this does not present a problem later. */
5470 detect_field_duplicates (tree fieldlist)
5475 /* First, see if there are more than "a few" fields.
5476 This is trivially true if there are zero or one fields. */
5479 x = TREE_CHAIN (fieldlist);
5485 } while (timeout > 0 && x);
5487 /* If there were "few" fields, avoid the overhead of allocating
5488 a hash table. Instead just do the nested traversal thing. */
5491 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
5494 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
5495 if (DECL_NAME (y) == DECL_NAME (x))
5497 error ("duplicate member %q+D", x);
5498 DECL_NAME (x) = NULL_TREE;
5504 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
5507 for (x = fieldlist; x ; x = TREE_CHAIN (x))
5508 if ((y = DECL_NAME (x)) != 0)
5510 slot = htab_find_slot (htab, y, INSERT);
5513 error ("duplicate member %q+D", x);
5514 DECL_NAME (x) = NULL_TREE;
5523 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5524 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5525 ATTRIBUTES are attributes to be applied to the structure. */
5528 finish_struct (tree t, tree fieldlist, tree attributes)
5531 bool toplevel = file_scope == current_scope;
5532 int saw_named_field;
5534 /* If this type was previously laid out as a forward reference,
5535 make sure we lay it out again. */
5539 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5543 for (x = fieldlist; x; x = TREE_CHAIN (x))
5544 if (DECL_NAME (x) != 0)
5549 if (TREE_CODE (t) == UNION_TYPE)
5552 pedwarn ("union has no named members");
5554 pedwarn ("union has no members");
5559 pedwarn ("struct has no named members");
5561 pedwarn ("struct has no members");
5566 /* Install struct as DECL_CONTEXT of each field decl.
5567 Also process specified field sizes, found in the DECL_INITIAL,
5568 storing 0 there after the type has been changed to precision equal
5569 to its width, rather than the precision of the specified standard
5570 type. (Correct layout requires the original type to have been preserved
5573 saw_named_field = 0;
5574 for (x = fieldlist; x; x = TREE_CHAIN (x))
5576 if (TREE_TYPE (x) == error_mark_node)
5579 DECL_CONTEXT (x) = t;
5581 if (TYPE_PACKED (t) && TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT)
5582 DECL_PACKED (x) = 1;
5584 /* If any field is const, the structure type is pseudo-const. */
5585 if (TREE_READONLY (x))
5586 C_TYPE_FIELDS_READONLY (t) = 1;
5589 /* A field that is pseudo-const makes the structure likewise. */
5590 tree t1 = TREE_TYPE (x);
5591 while (TREE_CODE (t1) == ARRAY_TYPE)
5592 t1 = TREE_TYPE (t1);
5593 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5594 && C_TYPE_FIELDS_READONLY (t1))
5595 C_TYPE_FIELDS_READONLY (t) = 1;
5598 /* Any field that is volatile means variables of this type must be
5599 treated in some ways as volatile. */
5600 if (TREE_THIS_VOLATILE (x))
5601 C_TYPE_FIELDS_VOLATILE (t) = 1;
5603 /* Any field of nominal variable size implies structure is too. */
5604 if (C_DECL_VARIABLE_SIZE (x))
5605 C_TYPE_VARIABLE_SIZE (t) = 1;
5607 if (DECL_INITIAL (x))
5609 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
5610 DECL_SIZE (x) = bitsize_int (width);
5611 DECL_BIT_FIELD (x) = 1;
5612 SET_DECL_C_BIT_FIELD (x);
5615 /* Detect flexible array member in an invalid context. */
5616 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5617 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5618 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5619 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5621 if (TREE_CODE (t) == UNION_TYPE)
5623 error ("%Jflexible array member in union", x);
5624 TREE_TYPE (x) = error_mark_node;
5626 else if (TREE_CHAIN (x) != NULL_TREE)
5628 error ("%Jflexible array member not at end of struct", x);
5629 TREE_TYPE (x) = error_mark_node;
5631 else if (!saw_named_field)
5633 error ("%Jflexible array member in otherwise empty struct", x);
5634 TREE_TYPE (x) = error_mark_node;
5638 if (pedantic && !in_system_header && TREE_CODE (t) == RECORD_TYPE
5639 && flexible_array_type_p (TREE_TYPE (x)))
5640 pedwarn ("%Jinvalid use of structure with flexible array member", x);
5643 saw_named_field = 1;
5646 detect_field_duplicates (fieldlist);
5648 /* Now we have the nearly final fieldlist. Record it,
5649 then lay out the structure or union (including the fields). */
5651 TYPE_FIELDS (t) = fieldlist;
5655 /* Give bit-fields their proper types. */
5657 tree *fieldlistp = &fieldlist;
5659 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp)
5660 && TREE_TYPE (*fieldlistp) != error_mark_node)
5662 unsigned HOST_WIDE_INT width
5663 = tree_low_cst (DECL_INITIAL (*fieldlistp), 1);
5664 tree type = TREE_TYPE (*fieldlistp);
5665 if (width != TYPE_PRECISION (type))
5667 TREE_TYPE (*fieldlistp)
5668 = c_build_bitfield_integer_type (width, TYPE_UNSIGNED (type));
5669 DECL_MODE (*fieldlistp) = TYPE_MODE (TREE_TYPE (*fieldlistp));
5671 DECL_INITIAL (*fieldlistp) = 0;
5674 fieldlistp = &TREE_CHAIN (*fieldlistp);
5677 /* Now we have the truly final field list.
5678 Store it in this type and in the variants. */
5680 TYPE_FIELDS (t) = fieldlist;
5682 /* If there are lots of fields, sort so we can look through them fast.
5683 We arbitrarily consider 16 or more elts to be "a lot". */
5688 for (x = fieldlist; x; x = TREE_CHAIN (x))
5690 if (len > 15 || DECL_NAME (x) == NULL)
5698 struct lang_type *space;
5699 struct sorted_fields_type *space2;
5701 len += list_length (x);
5703 /* Use the same allocation policy here that make_node uses, to
5704 ensure that this lives as long as the rest of the struct decl.
5705 All decls in an inline function need to be saved. */
5707 space = GGC_CNEW (struct lang_type);
5708 space2 = GGC_NEWVAR (struct sorted_fields_type,
5709 sizeof (struct sorted_fields_type) + len * sizeof (tree));
5713 field_array = &space2->elts[0];
5714 for (x = fieldlist; x; x = TREE_CHAIN (x))
5716 field_array[len++] = x;
5718 /* If there is anonymous struct or union, break out of the loop. */
5719 if (DECL_NAME (x) == NULL)
5722 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5725 TYPE_LANG_SPECIFIC (t) = space;
5726 TYPE_LANG_SPECIFIC (t)->s->len = len;
5727 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5728 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5733 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5735 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5736 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5737 C_TYPE_FIELDS_READONLY (x) = C_TYPE_FIELDS_READONLY (t);
5738 C_TYPE_FIELDS_VOLATILE (x) = C_TYPE_FIELDS_VOLATILE (t);
5739 C_TYPE_VARIABLE_SIZE (x) = C_TYPE_VARIABLE_SIZE (t);
5742 /* If this was supposed to be a transparent union, but we can't
5743 make it one, warn and turn off the flag. */
5744 if (TREE_CODE (t) == UNION_TYPE
5745 && TYPE_TRANSPARENT_UNION (t)
5746 && (!TYPE_FIELDS (t) || TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t))))
5748 TYPE_TRANSPARENT_UNION (t) = 0;
5749 warning (0, "union cannot be made transparent");
5752 /* If this structure or union completes the type of any previous
5753 variable declaration, lay it out and output its rtl. */
5754 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5758 tree decl = TREE_VALUE (x);
5759 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5760 layout_array_type (TREE_TYPE (decl));
5761 if (TREE_CODE (decl) != TYPE_DECL)
5763 layout_decl (decl, 0);
5764 if (c_dialect_objc ())
5765 objc_check_decl (decl);
5766 rest_of_decl_compilation (decl, toplevel, 0);
5771 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5773 /* Finish debugging output for this type. */
5774 rest_of_type_compilation (t, toplevel);
5776 /* If we're inside a function proper, i.e. not file-scope and not still
5777 parsing parameters, then arrange for the size of a variable sized type
5779 if (cur_stmt_list && variably_modified_type_p (t, NULL_TREE))
5780 add_stmt (build_stmt (DECL_EXPR, build_decl (TYPE_DECL, NULL, t)));
5785 /* Lay out the type T, and its element type, and so on. */
5788 layout_array_type (tree t)
5790 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5791 layout_array_type (TREE_TYPE (t));
5795 /* Begin compiling the definition of an enumeration type.
5796 NAME is its name (or null if anonymous).
5797 Returns the type object, as yet incomplete.
5798 Also records info about it so that build_enumerator
5799 may be used to declare the individual values as they are read. */
5802 start_enum (tree name)
5806 /* If this is the real definition for a previous forward reference,
5807 fill in the contents in the same object that used to be the
5808 forward reference. */
5811 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5813 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5815 enumtype = make_node (ENUMERAL_TYPE);
5816 pushtag (name, enumtype);
5819 if (C_TYPE_BEING_DEFINED (enumtype))
5820 error ("nested redefinition of %<enum %E%>", name);
5822 C_TYPE_BEING_DEFINED (enumtype) = 1;
5824 if (TYPE_VALUES (enumtype) != 0)
5826 /* This enum is a named one that has been declared already. */
5827 error ("redeclaration of %<enum %E%>", name);
5829 /* Completely replace its old definition.
5830 The old enumerators remain defined, however. */
5831 TYPE_VALUES (enumtype) = 0;
5834 enum_next_value = integer_zero_node;
5837 if (flag_short_enums)
5838 TYPE_PACKED (enumtype) = 1;
5843 /* After processing and defining all the values of an enumeration type,
5844 install their decls in the enumeration type and finish it off.
5845 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5846 and ATTRIBUTES are the specified attributes.
5847 Returns ENUMTYPE. */
5850 finish_enum (tree enumtype, tree values, tree attributes)
5853 tree minnode = 0, maxnode = 0;
5854 int precision, unsign;
5855 bool toplevel = (file_scope == current_scope);
5856 struct lang_type *lt;
5858 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5860 /* Calculate the maximum value of any enumerator in this type. */
5862 if (values == error_mark_node)
5863 minnode = maxnode = integer_zero_node;
5866 minnode = maxnode = TREE_VALUE (values);
5867 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5869 tree value = TREE_VALUE (pair);
5870 if (tree_int_cst_lt (maxnode, value))
5872 if (tree_int_cst_lt (value, minnode))
5877 /* Construct the final type of this enumeration. It is the same
5878 as one of the integral types - the narrowest one that fits, except
5879 that normally we only go as narrow as int - and signed iff any of
5880 the values are negative. */
5881 unsign = (tree_int_cst_sgn (minnode) >= 0);
5882 precision = MAX (min_precision (minnode, unsign),
5883 min_precision (maxnode, unsign));
5885 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5887 tem = c_common_type_for_size (precision, unsign);
5890 warning (0, "enumeration values exceed range of largest integer");
5891 tem = long_long_integer_type_node;
5895 tem = unsign ? unsigned_type_node : integer_type_node;
5897 TYPE_MIN_VALUE (enumtype) = TYPE_MIN_VALUE (tem);
5898 TYPE_MAX_VALUE (enumtype) = TYPE_MAX_VALUE (tem);
5899 TYPE_UNSIGNED (enumtype) = TYPE_UNSIGNED (tem);
5900 TYPE_SIZE (enumtype) = 0;
5902 /* If the precision of the type was specific with an attribute and it
5903 was too small, give an error. Otherwise, use it. */
5904 if (TYPE_PRECISION (enumtype))
5906 if (precision > TYPE_PRECISION (enumtype))
5907 error ("specified mode too small for enumeral values");
5910 TYPE_PRECISION (enumtype) = TYPE_PRECISION (tem);
5912 layout_type (enumtype);
5914 if (values != error_mark_node)
5916 /* Change the type of the enumerators to be the enum type. We
5917 need to do this irrespective of the size of the enum, for
5918 proper type checking. Replace the DECL_INITIALs of the
5919 enumerators, and the value slots of the list, with copies
5920 that have the enum type; they cannot be modified in place
5921 because they may be shared (e.g. integer_zero_node) Finally,
5922 change the purpose slots to point to the names of the decls. */
5923 for (pair = values; pair; pair = TREE_CHAIN (pair))
5925 tree enu = TREE_PURPOSE (pair);
5926 tree ini = DECL_INITIAL (enu);
5928 TREE_TYPE (enu) = enumtype;
5930 /* The ISO C Standard mandates enumerators to have type int,
5931 even though the underlying type of an enum type is
5932 unspecified. Here we convert any enumerators that fit in
5933 an int to type int, to avoid promotions to unsigned types
5934 when comparing integers with enumerators that fit in the
5935 int range. When -pedantic is given, build_enumerator()
5936 would have already taken care of those that don't fit. */
5937 if (int_fits_type_p (ini, integer_type_node))
5938 tem = integer_type_node;
5941 ini = convert (tem, ini);
5943 DECL_INITIAL (enu) = ini;
5944 TREE_PURPOSE (pair) = DECL_NAME (enu);
5945 TREE_VALUE (pair) = ini;
5948 TYPE_VALUES (enumtype) = values;
5951 /* Record the min/max values so that we can warn about bit-field
5952 enumerations that are too small for the values. */
5953 lt = GGC_CNEW (struct lang_type);
5954 lt->enum_min = minnode;
5955 lt->enum_max = maxnode;
5956 TYPE_LANG_SPECIFIC (enumtype) = lt;
5958 /* Fix up all variant types of this enum type. */
5959 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5961 if (tem == enumtype)
5963 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5964 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5965 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5966 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5967 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5968 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5969 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5970 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5971 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5972 TYPE_UNSIGNED (tem) = TYPE_UNSIGNED (enumtype);
5973 TYPE_LANG_SPECIFIC (tem) = TYPE_LANG_SPECIFIC (enumtype);
5976 /* Finish debugging output for this type. */
5977 rest_of_type_compilation (enumtype, toplevel);
5982 /* Build and install a CONST_DECL for one value of the
5983 current enumeration type (one that was begun with start_enum).
5984 Return a tree-list containing the CONST_DECL and its value.
5985 Assignment of sequential values by default is handled here. */
5988 build_enumerator (tree name, tree value)
5992 /* Validate and default VALUE. */
5996 /* Don't issue more errors for error_mark_node (i.e. an
5997 undeclared identifier) - just ignore the value expression. */
5998 if (value == error_mark_node)
6000 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value))
6001 || TREE_CODE (value) != INTEGER_CST)
6003 error ("enumerator value for %qE is not an integer constant", name);
6008 value = default_conversion (value);
6009 constant_expression_warning (value);
6013 /* Default based on previous value. */
6014 /* It should no longer be possible to have NON_LVALUE_EXPR
6018 value = enum_next_value;
6020 error ("overflow in enumeration values");
6023 if (pedantic && !int_fits_type_p (value, integer_type_node))
6025 pedwarn ("ISO C restricts enumerator values to range of %<int%>");
6026 /* XXX This causes -pedantic to change the meaning of the program.
6027 Remove? -zw 2004-03-15 */
6028 value = convert (integer_type_node, value);
6031 /* Set basis for default for next value. */
6032 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
6033 enum_overflow = tree_int_cst_lt (enum_next_value, value);
6035 /* Now create a declaration for the enum value name. */
6037 type = TREE_TYPE (value);
6038 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
6039 TYPE_PRECISION (integer_type_node)),
6040 (TYPE_PRECISION (type)
6041 >= TYPE_PRECISION (integer_type_node)
6042 && TYPE_UNSIGNED (type)));
6044 decl = build_decl (CONST_DECL, name, type);
6045 DECL_INITIAL (decl) = convert (type, value);
6048 return tree_cons (decl, value, NULL_TREE);
6052 /* Create the FUNCTION_DECL for a function definition.
6053 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
6054 the declaration; they describe the function's name and the type it returns,
6055 but twisted together in a fashion that parallels the syntax of C.
6057 This function creates a binding context for the function body
6058 as well as setting up the FUNCTION_DECL in current_function_decl.
6060 Returns 1 on success. If the DECLARATOR is not suitable for a function
6061 (it defines a datum instead), we return 0, which tells
6062 yyparse to report a parse error. */
6065 start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
6068 tree decl1, old_decl;
6069 tree restype, resdecl;
6070 struct c_label_context_se *nstack_se;
6071 struct c_label_context_vm *nstack_vm;
6073 current_function_returns_value = 0; /* Assume, until we see it does. */
6074 current_function_returns_null = 0;
6075 current_function_returns_abnormally = 0;
6076 warn_about_return_type = 0;
6077 c_switch_stack = NULL;
6079 nstack_se = XOBNEW (&parser_obstack, struct c_label_context_se);
6080 nstack_se->labels_def = NULL;
6081 nstack_se->labels_used = NULL;
6082 nstack_se->next = label_context_stack_se;
6083 label_context_stack_se = nstack_se;
6085 nstack_vm = XOBNEW (&parser_obstack, struct c_label_context_vm);
6086 nstack_vm->labels_def = NULL;
6087 nstack_vm->labels_used = NULL;
6088 nstack_vm->scope = 0;
6089 nstack_vm->next = label_context_stack_vm;
6090 label_context_stack_vm = nstack_vm;
6092 /* Indicate no valid break/continue context by setting these variables
6093 to some non-null, non-label value. We'll notice and emit the proper
6094 error message in c_finish_bc_stmt. */
6095 c_break_label = c_cont_label = size_zero_node;
6097 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, true, NULL);
6099 /* If the declarator is not suitable for a function definition,
6100 cause a syntax error. */
6103 label_context_stack_se = label_context_stack_se->next;
6104 label_context_stack_vm = label_context_stack_vm->next;
6108 decl_attributes (&decl1, attributes, 0);
6110 if (DECL_DECLARED_INLINE_P (decl1)
6111 && DECL_UNINLINABLE (decl1)
6112 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
6113 warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
6116 /* Handle gnu_inline attribute. */
6117 if (declspecs->inline_p
6118 && !flag_gnu89_inline
6119 && TREE_CODE (decl1) == FUNCTION_DECL
6120 && lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1)))
6122 if (declspecs->storage_class != csc_static)
6123 DECL_EXTERNAL (decl1) = !DECL_EXTERNAL (decl1);
6126 announce_function (decl1);
6128 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
6130 error ("return type is an incomplete type");
6131 /* Make it return void instead. */
6133 = build_function_type (void_type_node,
6134 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6137 if (warn_about_return_type)
6138 pedwarn_c99 ("return type defaults to %<int%>");
6140 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6141 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
6142 DECL_INITIAL (decl1) = error_mark_node;
6144 /* If this definition isn't a prototype and we had a prototype declaration
6145 before, copy the arg type info from that prototype. */
6146 old_decl = lookup_name_in_scope (DECL_NAME (decl1), current_scope);
6147 if (old_decl && TREE_CODE (old_decl) != FUNCTION_DECL)
6149 current_function_prototype_locus = UNKNOWN_LOCATION;
6150 current_function_prototype_built_in = false;
6151 current_function_prototype_arg_types = NULL_TREE;
6152 if (TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6154 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6155 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
6156 TREE_TYPE (TREE_TYPE (old_decl))))
6158 TREE_TYPE (decl1) = composite_type (TREE_TYPE (old_decl),
6160 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
6161 current_function_prototype_built_in
6162 = C_DECL_BUILTIN_PROTOTYPE (old_decl);
6163 current_function_prototype_arg_types
6164 = TYPE_ARG_TYPES (TREE_TYPE (decl1));
6166 if (TREE_PUBLIC (decl1))
6168 /* If there is an external prototype declaration of this
6169 function, record its location but do not copy information
6170 to this decl. This may be an invisible declaration
6171 (built-in or in a scope which has finished) or simply
6172 have more refined argument types than any declaration
6174 struct c_binding *b;
6175 for (b = I_SYMBOL_BINDING (DECL_NAME (decl1)); b; b = b->shadowed)
6176 if (B_IN_SCOPE (b, external_scope))
6180 tree ext_decl, ext_type;
6182 ext_type = b->type ? b->type : TREE_TYPE (ext_decl);
6183 if (TREE_CODE (ext_type) == FUNCTION_TYPE
6184 && comptypes (TREE_TYPE (TREE_TYPE (decl1)),
6185 TREE_TYPE (ext_type)))
6187 current_function_prototype_locus
6188 = DECL_SOURCE_LOCATION (ext_decl);
6189 current_function_prototype_built_in
6190 = C_DECL_BUILTIN_PROTOTYPE (ext_decl);
6191 current_function_prototype_arg_types
6192 = TYPE_ARG_TYPES (ext_type);
6198 /* Optionally warn of old-fashioned def with no previous prototype. */
6199 if (warn_strict_prototypes
6200 && old_decl != error_mark_node
6201 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6202 && C_DECL_ISNT_PROTOTYPE (old_decl))
6203 warning (OPT_Wstrict_prototypes,
6204 "function declaration isn%'t a prototype");
6205 /* Optionally warn of any global def with no previous prototype. */
6206 else if (warn_missing_prototypes
6207 && old_decl != error_mark_node
6208 && TREE_PUBLIC (decl1)
6209 && !MAIN_NAME_P (DECL_NAME (decl1))
6210 && C_DECL_ISNT_PROTOTYPE (old_decl))
6211 warning (OPT_Wmissing_prototypes, "no previous prototype for %q+D", decl1);
6212 /* Optionally warn of any def with no previous prototype
6213 if the function has already been used. */
6214 else if (warn_missing_prototypes
6216 && old_decl != error_mark_node
6217 && TREE_USED (old_decl)
6218 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6219 warning (OPT_Wmissing_prototypes,
6220 "%q+D was used with no prototype before its definition", decl1);
6221 /* Optionally warn of any global def with no previous declaration. */
6222 else if (warn_missing_declarations
6223 && TREE_PUBLIC (decl1)
6225 && !MAIN_NAME_P (DECL_NAME (decl1)))
6226 warning (OPT_Wmissing_declarations, "no previous declaration for %q+D",
6228 /* Optionally warn of any def with no previous declaration
6229 if the function has already been used. */
6230 else if (warn_missing_declarations
6232 && old_decl != error_mark_node
6233 && TREE_USED (old_decl)
6234 && C_DECL_IMPLICIT (old_decl))
6235 warning (OPT_Wmissing_declarations,
6236 "%q+D was used with no declaration before its definition", decl1);
6238 /* This function exists in static storage.
6239 (This does not mean `static' in the C sense!) */
6240 TREE_STATIC (decl1) = 1;
6242 /* A nested function is not global. */
6243 if (current_function_decl != 0)
6244 TREE_PUBLIC (decl1) = 0;
6246 /* This is the earliest point at which we might know the assembler
6247 name of the function. Thus, if it's set before this, die horribly. */
6248 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1));
6250 /* If #pragma weak was used, mark the decl weak now. */
6251 if (current_scope == file_scope)
6252 maybe_apply_pragma_weak (decl1);
6254 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6255 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
6260 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6261 != integer_type_node)
6262 pedwarn ("return type of %q+D is not %<int%>", decl1);
6264 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6265 args = TREE_CHAIN (args))
6267 tree type = args ? TREE_VALUE (args) : 0;
6269 if (type == void_type_node)
6276 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6277 pedwarn ("first argument of %q+D should be %<int%>", decl1);
6281 if (TREE_CODE (type) != POINTER_TYPE
6282 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6283 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6285 pedwarn ("second argument of %q+D should be %<char **%>",
6290 if (TREE_CODE (type) != POINTER_TYPE
6291 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6292 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6294 pedwarn ("third argument of %q+D should probably be "
6295 "%<char **%>", decl1);
6300 /* It is intentional that this message does not mention the third
6301 argument because it's only mentioned in an appendix of the
6303 if (argct > 0 && (argct < 2 || argct > 3))
6304 pedwarn ("%q+D takes only zero or two arguments", decl1);
6306 if (!TREE_PUBLIC (decl1))
6307 pedwarn ("%q+D is normally a non-static function", decl1);
6310 /* Record the decl so that the function name is defined.
6311 If we already have a decl for this name, and it is a FUNCTION_DECL,
6312 use the old decl. */
6314 current_function_decl = pushdecl (decl1);
6317 declare_parm_level ();
6319 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6320 /* Promote the value to int before returning it. */
6321 if (c_promoting_integer_type_p (restype))
6323 /* It retains unsignedness if not really getting wider. */
6324 if (TYPE_UNSIGNED (restype)
6325 && (TYPE_PRECISION (restype)
6326 == TYPE_PRECISION (integer_type_node)))
6327 restype = unsigned_type_node;
6329 restype = integer_type_node;
6332 resdecl = build_decl (RESULT_DECL, NULL_TREE, restype);
6333 DECL_ARTIFICIAL (resdecl) = 1;
6334 DECL_IGNORED_P (resdecl) = 1;
6335 DECL_RESULT (current_function_decl) = resdecl;
6337 start_fname_decls ();
6342 /* Subroutine of store_parm_decls which handles new-style function
6343 definitions (prototype format). The parms already have decls, so we
6344 need only record them as in effect and complain if any redundant
6345 old-style parm decls were written. */
6347 store_parm_decls_newstyle (tree fndecl, const struct c_arg_info *arg_info)
6351 if (current_scope->bindings)
6353 error ("%Jold-style parameter declarations in prototyped "
6354 "function definition", fndecl);
6356 /* Get rid of the old-style declarations. */
6360 /* Don't issue this warning for nested functions, and don't issue this
6361 warning if we got here because ARG_INFO_TYPES was error_mark_node
6362 (this happens when a function definition has just an ellipsis in
6363 its parameter list). */
6364 else if (!in_system_header && !current_function_scope
6365 && arg_info->types != error_mark_node)
6366 warning (OPT_Wtraditional,
6367 "%Jtraditional C rejects ISO C style function definitions",
6370 /* Now make all the parameter declarations visible in the function body.
6371 We can bypass most of the grunt work of pushdecl. */
6372 for (decl = arg_info->parms; decl; decl = TREE_CHAIN (decl))
6374 DECL_CONTEXT (decl) = current_function_decl;
6375 if (DECL_NAME (decl))
6377 bind (DECL_NAME (decl), decl, current_scope,
6378 /*invisible=*/false, /*nested=*/false);
6379 if (!TREE_USED (decl))
6380 warn_if_shadowing (decl);
6383 error ("%Jparameter name omitted", decl);
6386 /* Record the parameter list in the function declaration. */
6387 DECL_ARGUMENTS (fndecl) = arg_info->parms;
6389 /* Now make all the ancillary declarations visible, likewise. */
6390 for (decl = arg_info->others; decl; decl = TREE_CHAIN (decl))
6392 DECL_CONTEXT (decl) = current_function_decl;
6393 if (DECL_NAME (decl))
6394 bind (DECL_NAME (decl), decl, current_scope,
6395 /*invisible=*/false, /*nested=*/false);
6398 /* And all the tag declarations. */
6399 for (decl = arg_info->tags; decl; decl = TREE_CHAIN (decl))
6400 if (TREE_PURPOSE (decl))
6401 bind (TREE_PURPOSE (decl), TREE_VALUE (decl), current_scope,
6402 /*invisible=*/false, /*nested=*/false);
6405 /* Subroutine of store_parm_decls which handles old-style function
6406 definitions (separate parameter list and declarations). */
6409 store_parm_decls_oldstyle (tree fndecl, const struct c_arg_info *arg_info)
6411 struct c_binding *b;
6412 tree parm, decl, last;
6413 tree parmids = arg_info->parms;
6414 struct pointer_set_t *seen_args = pointer_set_create ();
6416 if (!in_system_header)
6417 warning (OPT_Wold_style_definition, "%Jold-style function definition",
6420 /* Match each formal parameter name with its declaration. Save each
6421 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
6422 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6424 if (TREE_VALUE (parm) == 0)
6426 error ("%Jparameter name missing from parameter list", fndecl);
6427 TREE_PURPOSE (parm) = 0;
6431 b = I_SYMBOL_BINDING (TREE_VALUE (parm));
6432 if (b && B_IN_CURRENT_SCOPE (b))
6435 /* If we got something other than a PARM_DECL it is an error. */
6436 if (TREE_CODE (decl) != PARM_DECL)
6437 error ("%q+D declared as a non-parameter", decl);
6438 /* If the declaration is already marked, we have a duplicate
6439 name. Complain and ignore the duplicate. */
6440 else if (pointer_set_contains (seen_args, decl))
6442 error ("multiple parameters named %q+D", decl);
6443 TREE_PURPOSE (parm) = 0;
6446 /* If the declaration says "void", complain and turn it into
6448 else if (VOID_TYPE_P (TREE_TYPE (decl)))
6450 error ("parameter %q+D declared with void type", decl);
6451 TREE_TYPE (decl) = integer_type_node;
6452 DECL_ARG_TYPE (decl) = integer_type_node;
6453 layout_decl (decl, 0);
6455 warn_if_shadowing (decl);
6457 /* If no declaration found, default to int. */
6460 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
6461 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
6462 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
6464 warn_if_shadowing (decl);
6467 pedwarn ("type of %q+D defaults to %<int%>", decl);
6468 else if (extra_warnings)
6469 warning (OPT_Wextra, "type of %q+D defaults to %<int%>", decl);
6472 TREE_PURPOSE (parm) = decl;
6473 pointer_set_insert (seen_args, decl);
6476 /* Now examine the parms chain for incomplete declarations
6477 and declarations with no corresponding names. */
6479 for (b = current_scope->bindings; b; b = b->prev)
6482 if (TREE_CODE (parm) != PARM_DECL)
6485 if (TREE_TYPE (parm) != error_mark_node
6486 && !COMPLETE_TYPE_P (TREE_TYPE (parm)))
6488 error ("parameter %q+D has incomplete type", parm);
6489 TREE_TYPE (parm) = error_mark_node;
6492 if (!pointer_set_contains (seen_args, parm))
6494 error ("declaration for parameter %q+D but no such parameter", parm);
6496 /* Pretend the parameter was not missing.
6497 This gets us to a standard state and minimizes
6498 further error messages. */
6499 parmids = chainon (parmids, tree_cons (parm, 0, 0));
6503 /* Chain the declarations together in the order of the list of
6504 names. Store that chain in the function decl, replacing the
6505 list of names. Update the current scope to match. */
6506 DECL_ARGUMENTS (fndecl) = 0;
6508 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
6509 if (TREE_PURPOSE (parm))
6511 if (parm && TREE_PURPOSE (parm))
6513 last = TREE_PURPOSE (parm);
6514 DECL_ARGUMENTS (fndecl) = last;
6516 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
6517 if (TREE_PURPOSE (parm))
6519 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6520 last = TREE_PURPOSE (parm);
6522 TREE_CHAIN (last) = 0;
6525 pointer_set_destroy (seen_args);
6527 /* If there was a previous prototype,
6528 set the DECL_ARG_TYPE of each argument according to
6529 the type previously specified, and report any mismatches. */
6531 if (current_function_prototype_arg_types)
6534 for (parm = DECL_ARGUMENTS (fndecl),
6535 type = current_function_prototype_arg_types;
6536 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6537 != void_type_node));
6538 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6540 if (parm == 0 || type == 0
6541 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6543 if (current_function_prototype_built_in)
6544 warning (0, "number of arguments doesn%'t match "
6545 "built-in prototype");
6548 error ("number of arguments doesn%'t match prototype");
6549 error ("%Hprototype declaration",
6550 ¤t_function_prototype_locus);
6554 /* Type for passing arg must be consistent with that
6555 declared for the arg. ISO C says we take the unqualified
6556 type for parameters declared with qualified type. */
6557 if (!comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6558 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6560 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6561 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6563 /* Adjust argument to match prototype. E.g. a previous
6564 `int foo(float);' prototype causes
6565 `int foo(x) float x; {...}' to be treated like
6566 `int foo(float x) {...}'. This is particularly
6567 useful for argument types like uid_t. */
6568 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6570 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
6571 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6572 && TYPE_PRECISION (TREE_TYPE (parm))
6573 < TYPE_PRECISION (integer_type_node))
6574 DECL_ARG_TYPE (parm) = integer_type_node;
6578 /* ??? Is it possible to get here with a
6579 built-in prototype or will it always have
6580 been diagnosed as conflicting with an
6581 old-style definition and discarded? */
6582 if (current_function_prototype_built_in)
6583 warning (0, "promoted argument %qD "
6584 "doesn%'t match built-in prototype", parm);
6587 pedwarn ("promoted argument %qD "
6588 "doesn%'t match prototype", parm);
6589 pedwarn ("%Hprototype declaration",
6590 ¤t_function_prototype_locus);
6596 if (current_function_prototype_built_in)
6597 warning (0, "argument %qD doesn%'t match "
6598 "built-in prototype", parm);
6601 error ("argument %qD doesn%'t match prototype", parm);
6602 error ("%Hprototype declaration",
6603 ¤t_function_prototype_locus);
6608 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6611 /* Otherwise, create a prototype that would match. */
6615 tree actual = 0, last = 0, type;
6617 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6619 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6621 TREE_CHAIN (last) = type;
6626 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6628 TREE_CHAIN (last) = type;
6632 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6633 of the type of this function, but we need to avoid having this
6634 affect the types of other similarly-typed functions, so we must
6635 first force the generation of an identical (but separate) type
6636 node for the relevant function type. The new node we create
6637 will be a variant of the main variant of the original function
6640 TREE_TYPE (fndecl) = build_variant_type_copy (TREE_TYPE (fndecl));
6642 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6646 /* Store parameter declarations passed in ARG_INFO into the current
6647 function declaration. */
6650 store_parm_decls_from (struct c_arg_info *arg_info)
6652 current_function_arg_info = arg_info;
6653 store_parm_decls ();
6656 /* Store the parameter declarations into the current function declaration.
6657 This is called after parsing the parameter declarations, before
6658 digesting the body of the function.
6660 For an old-style definition, construct a prototype out of the old-style
6661 parameter declarations and inject it into the function's type. */
6664 store_parm_decls (void)
6666 tree fndecl = current_function_decl;
6669 /* The argument information block for FNDECL. */
6670 struct c_arg_info *arg_info = current_function_arg_info;
6671 current_function_arg_info = 0;
6673 /* True if this definition is written with a prototype. Note:
6674 despite C99 6.7.5.3p14, we can *not* treat an empty argument
6675 list in a function definition as equivalent to (void) -- an
6676 empty argument list specifies the function has no parameters,
6677 but only (void) sets up a prototype for future calls. */
6678 proto = arg_info->types != 0;
6681 store_parm_decls_newstyle (fndecl, arg_info);
6683 store_parm_decls_oldstyle (fndecl, arg_info);
6685 /* The next call to push_scope will be a function body. */
6687 next_is_function_body = true;
6689 /* Write a record describing this function definition to the prototypes
6690 file (if requested). */
6692 gen_aux_info_record (fndecl, 1, 0, proto);
6694 /* Initialize the RTL code for the function. */
6695 allocate_struct_function (fndecl);
6697 /* Begin the statement tree for this function. */
6698 DECL_SAVED_TREE (fndecl) = push_stmt_list ();
6700 /* ??? Insert the contents of the pending sizes list into the function
6701 to be evaluated. The only reason left to have this is
6702 void foo(int n, int array[n++])
6703 because we throw away the array type in favor of a pointer type, and
6704 thus won't naturally see the SAVE_EXPR containing the increment. All
6705 other pending sizes would be handled by gimplify_parameters. */
6708 for (t = nreverse (get_pending_sizes ()); t ; t = TREE_CHAIN (t))
6709 add_stmt (TREE_VALUE (t));
6712 /* Even though we're inside a function body, we still don't want to
6713 call expand_expr to calculate the size of a variable-sized array.
6714 We haven't necessarily assigned RTL to all variables yet, so it's
6715 not safe to try to expand expressions involving them. */
6716 cfun->x_dont_save_pending_sizes_p = 1;
6719 /* Emit diagnostics that require gimple input for detection. Operate on
6720 FNDECL and all its nested functions. */
6723 c_gimple_diagnostics_recursively (tree fndecl)
6725 struct cgraph_node *cgn;
6727 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
6728 c_warn_unused_result (&DECL_SAVED_TREE (fndecl));
6730 /* Notice when OpenMP structured block constraints are violated. */
6732 diagnose_omp_structured_block_errors (fndecl);
6734 /* Finalize all nested functions now. */
6735 cgn = cgraph_node (fndecl);
6736 for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested)
6737 c_gimple_diagnostics_recursively (cgn->decl);
6740 /* Finish up a function declaration and compile that function
6741 all the way to assembler language output. The free the storage
6742 for the function definition.
6744 This is called after parsing the body of the function definition. */
6747 finish_function (void)
6749 tree fndecl = current_function_decl;
6751 label_context_stack_se = label_context_stack_se->next;
6752 label_context_stack_vm = label_context_stack_vm->next;
6754 if (TREE_CODE (fndecl) == FUNCTION_DECL
6755 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6757 tree args = DECL_ARGUMENTS (fndecl);
6758 for (; args; args = TREE_CHAIN (args))
6760 tree type = TREE_TYPE (args);
6761 if (INTEGRAL_TYPE_P (type)
6762 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6763 DECL_ARG_TYPE (args) = integer_type_node;
6767 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6768 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6770 /* Must mark the RESULT_DECL as being in this function. */
6772 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
6773 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6775 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6777 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6778 != integer_type_node)
6780 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6781 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6783 pedwarn ("return type of %q+D is not %<int%>", fndecl);
6789 tree stmt = c_finish_return (integer_zero_node);
6790 #ifdef USE_MAPPED_LOCATION
6791 /* Hack. We don't want the middle-end to warn that this return
6792 is unreachable, so we mark its location as special. Using
6793 UNKNOWN_LOCATION has the problem that it gets clobbered in
6794 annotate_one_with_locus. A cleaner solution might be to
6795 ensure ! should_carry_locus_p (stmt), but that needs a flag.
6797 SET_EXPR_LOCATION (stmt, BUILTINS_LOCATION);
6799 /* Hack. We don't want the middle-end to warn that this
6800 return is unreachable, so put the statement on the
6802 annotate_with_file_line (stmt, input_filename, 0);
6808 /* Tie off the statement tree for this function. */
6809 DECL_SAVED_TREE (fndecl) = pop_stmt_list (DECL_SAVED_TREE (fndecl));
6811 finish_fname_decls ();
6813 /* Complain if there's just no return statement. */
6814 if (warn_return_type
6815 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6816 && !current_function_returns_value && !current_function_returns_null
6817 /* Don't complain if we are no-return. */
6818 && !current_function_returns_abnormally
6819 /* Don't warn for main(). */
6820 && !MAIN_NAME_P (DECL_NAME (fndecl))
6821 /* Or if they didn't actually specify a return type. */
6822 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6823 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6824 inline function, as we might never be compiled separately. */
6825 && DECL_INLINE (fndecl))
6827 warning (OPT_Wreturn_type,
6828 "no return statement in function returning non-void");
6829 TREE_NO_WARNING (fndecl) = 1;
6832 /* With just -Wextra, complain only if function returns both with
6833 and without a value. */
6835 && current_function_returns_value
6836 && current_function_returns_null)
6837 warning (OPT_Wextra, "this function may return with or without a value");
6839 /* Store the end of the function, so that we get good line number
6840 info for the epilogue. */
6841 cfun->function_end_locus = input_location;
6843 /* If we don't have ctors/dtors sections, and this is a static
6844 constructor or destructor, it must be recorded now. */
6845 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6846 && !targetm.have_ctors_dtors)
6847 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6848 if (DECL_STATIC_DESTRUCTOR (fndecl)
6849 && !targetm.have_ctors_dtors)
6850 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6852 /* Finalize the ELF visibility for the function. */
6853 c_determine_visibility (fndecl);
6855 /* Genericize before inlining. Delay genericizing nested functions
6856 until their parent function is genericized. Since finalizing
6857 requires GENERIC, delay that as well. */
6859 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node
6860 && !undef_nested_function)
6862 if (!decl_function_context (fndecl))
6864 c_genericize (fndecl);
6865 c_gimple_diagnostics_recursively (fndecl);
6867 /* ??? Objc emits functions after finalizing the compilation unit.
6868 This should be cleaned up later and this conditional removed. */
6869 if (cgraph_global_info_ready)
6871 c_expand_body (fndecl);
6875 cgraph_finalize_function (fndecl, false);
6879 /* Register this function with cgraph just far enough to get it
6880 added to our parent's nested function list. Handy, since the
6881 C front end doesn't have such a list. */
6882 (void) cgraph_node (fndecl);
6886 if (!decl_function_context (fndecl))
6887 undef_nested_function = false;
6889 /* We're leaving the context of this function, so zap cfun.
6890 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
6891 tree_rest_of_compilation. */
6893 current_function_decl = NULL;
6896 /* Generate the RTL for the body of FNDECL. */
6899 c_expand_body (tree fndecl)
6902 if (!DECL_INITIAL (fndecl)
6903 || DECL_INITIAL (fndecl) == error_mark_node)
6906 tree_rest_of_compilation (fndecl);
6908 if (DECL_STATIC_CONSTRUCTOR (fndecl)
6909 && targetm.have_ctors_dtors)
6910 targetm.asm_out.constructor (XEXP (DECL_RTL (fndecl), 0),
6911 DEFAULT_INIT_PRIORITY);
6912 if (DECL_STATIC_DESTRUCTOR (fndecl)
6913 && targetm.have_ctors_dtors)
6914 targetm.asm_out.destructor (XEXP (DECL_RTL (fndecl), 0),
6915 DEFAULT_INIT_PRIORITY);
6918 /* Check the declarations given in a for-loop for satisfying the C99
6919 constraints. If exactly one such decl is found, return it. */
6922 check_for_loop_decls (void)
6924 struct c_binding *b;
6925 tree one_decl = NULL_TREE;
6931 /* If we get here, declarations have been used in a for loop without
6932 the C99 for loop scope. This doesn't make much sense, so don't
6934 error ("%<for%> loop initial declaration used outside C99 mode");
6937 /* C99 subclause 6.8.5 paragraph 3:
6939 [#3] The declaration part of a for statement shall only
6940 declare identifiers for objects having storage class auto or
6943 It isn't clear whether, in this sentence, "identifiers" binds to
6944 "shall only declare" or to "objects" - that is, whether all identifiers
6945 declared must be identifiers for objects, or whether the restriction
6946 only applies to those that are. (A question on this in comp.std.c
6947 in November 2000 received no answer.) We implement the strictest
6948 interpretation, to avoid creating an extension which later causes
6951 for (b = current_scope->bindings; b; b = b->prev)
6954 tree decl = b->decl;
6959 switch (TREE_CODE (decl))
6962 if (TREE_STATIC (decl))
6963 error ("declaration of static variable %q+D in %<for%> loop "
6964 "initial declaration", decl);
6965 else if (DECL_EXTERNAL (decl))
6966 error ("declaration of %<extern%> variable %q+D in %<for%> loop "
6967 "initial declaration", decl);
6971 error ("%<struct %E%> declared in %<for%> loop initial declaration",
6975 error ("%<union %E%> declared in %<for%> loop initial declaration",
6979 error ("%<enum %E%> declared in %<for%> loop initial declaration",
6983 error ("declaration of non-variable %q+D in %<for%> loop "
6984 "initial declaration", decl);
6991 return n_decls == 1 ? one_decl : NULL_TREE;
6994 /* Save and reinitialize the variables
6995 used during compilation of a C function. */
6998 c_push_function_context (struct function *f)
7000 struct language_function *p;
7001 p = GGC_NEW (struct language_function);
7004 p->base.x_stmt_tree = c_stmt_tree;
7005 p->x_break_label = c_break_label;
7006 p->x_cont_label = c_cont_label;
7007 p->x_switch_stack = c_switch_stack;
7008 p->arg_info = current_function_arg_info;
7009 p->returns_value = current_function_returns_value;
7010 p->returns_null = current_function_returns_null;
7011 p->returns_abnormally = current_function_returns_abnormally;
7012 p->warn_about_return_type = warn_about_return_type;
7015 /* Restore the variables used during compilation of a C function. */
7018 c_pop_function_context (struct function *f)
7020 struct language_function *p = f->language;
7022 if (DECL_STRUCT_FUNCTION (current_function_decl) == 0
7023 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
7025 /* Stop pointing to the local nodes about to be freed. */
7026 /* But DECL_INITIAL must remain nonzero so we know this
7027 was an actual function definition. */
7028 DECL_INITIAL (current_function_decl) = error_mark_node;
7029 DECL_ARGUMENTS (current_function_decl) = 0;
7032 c_stmt_tree = p->base.x_stmt_tree;
7033 c_break_label = p->x_break_label;
7034 c_cont_label = p->x_cont_label;
7035 c_switch_stack = p->x_switch_stack;
7036 current_function_arg_info = p->arg_info;
7037 current_function_returns_value = p->returns_value;
7038 current_function_returns_null = p->returns_null;
7039 current_function_returns_abnormally = p->returns_abnormally;
7040 warn_about_return_type = p->warn_about_return_type;
7045 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
7048 c_dup_lang_specific_decl (tree decl)
7050 struct lang_decl *ld;
7052 if (!DECL_LANG_SPECIFIC (decl))
7055 ld = GGC_NEW (struct lang_decl);
7056 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
7057 DECL_LANG_SPECIFIC (decl) = ld;
7060 /* The functions below are required for functionality of doing
7061 function at once processing in the C front end. Currently these
7062 functions are not called from anywhere in the C front end, but as
7063 these changes continue, that will change. */
7065 /* Returns the stmt_tree (if any) to which statements are currently
7066 being added. If there is no active statement-tree, NULL is
7070 current_stmt_tree (void)
7072 return &c_stmt_tree;
7075 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
7079 anon_aggr_type_p (tree ARG_UNUSED (node))
7084 /* Return the global value of T as a symbol. */
7087 identifier_global_value (tree t)
7089 struct c_binding *b;
7091 for (b = I_SYMBOL_BINDING (t); b; b = b->shadowed)
7092 if (B_IN_FILE_SCOPE (b) || B_IN_EXTERNAL_SCOPE (b))
7098 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
7099 otherwise the name is found in ridpointers from RID_INDEX. */
7102 record_builtin_type (enum rid rid_index, const char *name, tree type)
7106 id = ridpointers[(int) rid_index];
7108 id = get_identifier (name);
7109 decl = build_decl (TYPE_DECL, id, type);
7111 if (debug_hooks->type_decl)
7112 debug_hooks->type_decl (decl, false);
7115 /* Build the void_list_node (void_type_node having been created). */
7117 build_void_list_node (void)
7119 tree t = build_tree_list (NULL_TREE, void_type_node);
7123 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
7126 build_c_parm (struct c_declspecs *specs, tree attrs,
7127 struct c_declarator *declarator)
7129 struct c_parm *ret = XOBNEW (&parser_obstack, struct c_parm);
7132 ret->declarator = declarator;
7136 /* Return a declarator with nested attributes. TARGET is the inner
7137 declarator to which these attributes apply. ATTRS are the
7140 struct c_declarator *
7141 build_attrs_declarator (tree attrs, struct c_declarator *target)
7143 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7144 ret->kind = cdk_attrs;
7145 ret->declarator = target;
7146 ret->u.attrs = attrs;
7150 /* Return a declarator for a function with arguments specified by ARGS
7151 and return type specified by TARGET. */
7153 struct c_declarator *
7154 build_function_declarator (struct c_arg_info *args,
7155 struct c_declarator *target)
7157 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7158 ret->kind = cdk_function;
7159 ret->declarator = target;
7160 ret->u.arg_info = args;
7164 /* Return a declarator for the identifier IDENT (which may be
7165 NULL_TREE for an abstract declarator). */
7167 struct c_declarator *
7168 build_id_declarator (tree ident)
7170 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7172 ret->declarator = 0;
7174 /* Default value - may get reset to a more precise location. */
7175 ret->id_loc = input_location;
7179 /* Return something to represent absolute declarators containing a *.
7180 TARGET is the absolute declarator that the * contains.
7181 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
7182 to apply to the pointer type. */
7184 struct c_declarator *
7185 make_pointer_declarator (struct c_declspecs *type_quals_attrs,
7186 struct c_declarator *target)
7190 struct c_declarator *itarget = target;
7191 struct c_declarator *ret = XOBNEW (&parser_obstack, struct c_declarator);
7192 if (type_quals_attrs)
7194 attrs = type_quals_attrs->attrs;
7195 quals = quals_from_declspecs (type_quals_attrs);
7196 if (attrs != NULL_TREE)
7197 itarget = build_attrs_declarator (attrs, target);
7199 ret->kind = cdk_pointer;
7200 ret->declarator = itarget;
7201 ret->u.pointer_quals = quals;
7205 /* Return a pointer to a structure for an empty list of declaration
7208 struct c_declspecs *
7209 build_null_declspecs (void)
7211 struct c_declspecs *ret = XOBNEW (&parser_obstack, struct c_declspecs);
7215 ret->typespec_word = cts_none;
7216 ret->storage_class = csc_none;
7217 ret->declspecs_seen_p = false;
7218 ret->type_seen_p = false;
7219 ret->non_sc_seen_p = false;
7220 ret->typedef_p = false;
7221 ret->tag_defined_p = false;
7222 ret->explicit_signed_p = false;
7223 ret->deprecated_p = false;
7224 ret->default_int_p = false;
7225 ret->long_p = false;
7226 ret->long_long_p = false;
7227 ret->short_p = false;
7228 ret->signed_p = false;
7229 ret->unsigned_p = false;
7230 ret->complex_p = false;
7231 ret->inline_p = false;
7232 ret->thread_p = false;
7233 ret->const_p = false;
7234 ret->volatile_p = false;
7235 ret->restrict_p = false;
7239 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
7242 struct c_declspecs *
7243 declspecs_add_qual (struct c_declspecs *specs, tree qual)
7247 specs->non_sc_seen_p = true;
7248 specs->declspecs_seen_p = true;
7249 gcc_assert (TREE_CODE (qual) == IDENTIFIER_NODE
7250 && C_IS_RESERVED_WORD (qual));
7251 i = C_RID_CODE (qual);
7255 dupe = specs->const_p;
7256 specs->const_p = true;
7259 dupe = specs->volatile_p;
7260 specs->volatile_p = true;
7263 dupe = specs->restrict_p;
7264 specs->restrict_p = true;
7269 if (dupe && pedantic && !flag_isoc99)
7270 pedwarn ("duplicate %qE", qual);
7274 /* Add the type specifier TYPE to the declaration specifiers SPECS,
7277 struct c_declspecs *
7278 declspecs_add_type (struct c_declspecs *specs, struct c_typespec spec)
7280 tree type = spec.spec;
7281 specs->non_sc_seen_p = true;
7282 specs->declspecs_seen_p = true;
7283 specs->type_seen_p = true;
7284 if (TREE_DEPRECATED (type))
7285 specs->deprecated_p = true;
7287 /* Handle type specifier keywords. */
7288 if (TREE_CODE (type) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (type))
7290 enum rid i = C_RID_CODE (type);
7293 error ("two or more data types in declaration specifiers");
7296 if ((int) i <= (int) RID_LAST_MODIFIER)
7298 /* "long", "short", "signed", "unsigned" or "_Complex". */
7303 if (specs->long_long_p)
7305 error ("%<long long long%> is too long for GCC");
7310 if (specs->typespec_word == cts_double)
7312 error ("both %<long long%> and %<double%> in "
7313 "declaration specifiers");
7316 if (pedantic && !flag_isoc99 && !in_system_header
7318 pedwarn ("ISO C90 does not support %<long long%>");
7319 specs->long_long_p = 1;
7323 error ("both %<long%> and %<short%> in "
7324 "declaration specifiers");
7325 else if (specs->typespec_word == cts_void)
7326 error ("both %<long%> and %<void%> in "
7327 "declaration specifiers");
7328 else if (specs->typespec_word == cts_bool)
7329 error ("both %<long%> and %<_Bool%> in "
7330 "declaration specifiers");
7331 else if (specs->typespec_word == cts_char)
7332 error ("both %<long%> and %<char%> in "
7333 "declaration specifiers");
7334 else if (specs->typespec_word == cts_float)
7335 error ("both %<long%> and %<float%> in "
7336 "declaration specifiers");
7337 else if (specs->typespec_word == cts_dfloat32)
7338 error ("both %<long%> and %<_Decimal32%> in "
7339 "declaration specifiers");
7340 else if (specs->typespec_word == cts_dfloat64)
7341 error ("both %<long%> and %<_Decimal64%> in "
7342 "declaration specifiers");
7343 else if (specs->typespec_word == cts_dfloat128)
7344 error ("both %<long%> and %<_Decimal128%> in "
7345 "declaration specifiers");
7347 specs->long_p = true;
7350 dupe = specs->short_p;
7352 error ("both %<long%> and %<short%> in "
7353 "declaration specifiers");
7354 else if (specs->typespec_word == cts_void)
7355 error ("both %<short%> and %<void%> in "
7356 "declaration specifiers");
7357 else if (specs->typespec_word == cts_bool)
7358 error ("both %<short%> and %<_Bool%> in "
7359 "declaration specifiers");
7360 else if (specs->typespec_word == cts_char)
7361 error ("both %<short%> and %<char%> in "
7362 "declaration specifiers");
7363 else if (specs->typespec_word == cts_float)
7364 error ("both %<short%> and %<float%> in "
7365 "declaration specifiers");
7366 else if (specs->typespec_word == cts_double)
7367 error ("both %<short%> and %<double%> in "
7368 "declaration specifiers");
7369 else if (specs->typespec_word == cts_dfloat32)
7370 error ("both %<short%> and %<_Decimal32%> in "
7371 "declaration specifiers");
7372 else if (specs->typespec_word == cts_dfloat64)
7373 error ("both %<short%> and %<_Decimal64%> in "
7374 "declaration specifiers");
7375 else if (specs->typespec_word == cts_dfloat128)
7376 error ("both %<short%> and %<_Decimal128%> in "
7377 "declaration specifiers");
7379 specs->short_p = true;
7382 dupe = specs->signed_p;
7383 if (specs->unsigned_p)
7384 error ("both %<signed%> and %<unsigned%> in "
7385 "declaration specifiers");
7386 else if (specs->typespec_word == cts_void)
7387 error ("both %<signed%> and %<void%> in "
7388 "declaration specifiers");
7389 else if (specs->typespec_word == cts_bool)
7390 error ("both %<signed%> and %<_Bool%> in "
7391 "declaration specifiers");
7392 else if (specs->typespec_word == cts_float)
7393 error ("both %<signed%> and %<float%> in "
7394 "declaration specifiers");
7395 else if (specs->typespec_word == cts_double)
7396 error ("both %<signed%> and %<double%> in "
7397 "declaration specifiers");
7398 else if (specs->typespec_word == cts_dfloat32)
7399 error ("both %<signed%> and %<_Decimal32%> in "
7400 "declaration specifiers");
7401 else if (specs->typespec_word == cts_dfloat64)
7402 error ("both %<signed%> and %<_Decimal64%> in "
7403 "declaration specifiers");
7404 else if (specs->typespec_word == cts_dfloat128)
7405 error ("both %<signed%> and %<_Decimal128%> in "
7406 "declaration specifiers");
7408 specs->signed_p = true;
7411 dupe = specs->unsigned_p;
7412 if (specs->signed_p)
7413 error ("both %<signed%> and %<unsigned%> in "
7414 "declaration specifiers");
7415 else if (specs->typespec_word == cts_void)
7416 error ("both %<unsigned%> and %<void%> in "
7417 "declaration specifiers");
7418 else if (specs->typespec_word == cts_bool)
7419 error ("both %<unsigned%> and %<_Bool%> in "
7420 "declaration specifiers");
7421 else if (specs->typespec_word == cts_float)
7422 error ("both %<unsigned%> and %<float%> in "
7423 "declaration specifiers");
7424 else if (specs->typespec_word == cts_double)
7425 error ("both %<unsigned%> and %<double%> in "
7426 "declaration specifiers");
7427 else if (specs->typespec_word == cts_dfloat32)
7428 error ("both %<unsigned%> and %<_Decimal32%> in "
7429 "declaration specifiers");
7430 else if (specs->typespec_word == cts_dfloat64)
7431 error ("both %<unsigned%> and %<_Decimal64%> in "
7432 "declaration specifiers");
7433 else if (specs->typespec_word == cts_dfloat128)
7434 error ("both %<unsigned%> and %<_Decimal128%> in "
7435 "declaration specifiers");
7437 specs->unsigned_p = true;
7440 dupe = specs->complex_p;
7441 if (pedantic && !flag_isoc99 && !in_system_header)
7442 pedwarn ("ISO C90 does not support complex types");
7443 if (specs->typespec_word == cts_void)
7444 error ("both %<complex%> and %<void%> in "
7445 "declaration specifiers");
7446 else if (specs->typespec_word == cts_bool)
7447 error ("both %<complex%> and %<_Bool%> in "
7448 "declaration specifiers");
7449 else if (specs->typespec_word == cts_dfloat32)
7450 error ("both %<complex%> and %<_Decimal32%> in "
7451 "declaration specifiers");
7452 else if (specs->typespec_word == cts_dfloat64)
7453 error ("both %<complex%> and %<_Decimal64%> in "
7454 "declaration specifiers");
7455 else if (specs->typespec_word == cts_dfloat128)
7456 error ("both %<complex%> and %<_Decimal128%> in "
7457 "declaration specifiers");
7459 specs->complex_p = true;
7466 error ("duplicate %qE", type);
7472 /* "void", "_Bool", "char", "int", "float" or "double". */
7473 if (specs->typespec_word != cts_none)
7475 error ("two or more data types in declaration specifiers");
7482 error ("both %<long%> and %<void%> in "
7483 "declaration specifiers");
7484 else if (specs->short_p)
7485 error ("both %<short%> and %<void%> in "
7486 "declaration specifiers");
7487 else if (specs->signed_p)
7488 error ("both %<signed%> and %<void%> in "
7489 "declaration specifiers");
7490 else if (specs->unsigned_p)
7491 error ("both %<unsigned%> and %<void%> in "
7492 "declaration specifiers");
7493 else if (specs->complex_p)
7494 error ("both %<complex%> and %<void%> in "
7495 "declaration specifiers");
7497 specs->typespec_word = cts_void;
7501 error ("both %<long%> and %<_Bool%> in "
7502 "declaration specifiers");
7503 else if (specs->short_p)
7504 error ("both %<short%> and %<_Bool%> in "
7505 "declaration specifiers");
7506 else if (specs->signed_p)
7507 error ("both %<signed%> and %<_Bool%> in "
7508 "declaration specifiers");
7509 else if (specs->unsigned_p)
7510 error ("both %<unsigned%> and %<_Bool%> in "
7511 "declaration specifiers");
7512 else if (specs->complex_p)
7513 error ("both %<complex%> and %<_Bool%> in "
7514 "declaration specifiers");
7516 specs->typespec_word = cts_bool;
7520 error ("both %<long%> and %<char%> in "
7521 "declaration specifiers");
7522 else if (specs->short_p)
7523 error ("both %<short%> and %<char%> in "
7524 "declaration specifiers");
7526 specs->typespec_word = cts_char;
7529 specs->typespec_word = cts_int;
7533 error ("both %<long%> and %<float%> in "
7534 "declaration specifiers");
7535 else if (specs->short_p)
7536 error ("both %<short%> and %<float%> in "
7537 "declaration specifiers");
7538 else if (specs->signed_p)
7539 error ("both %<signed%> and %<float%> in "
7540 "declaration specifiers");
7541 else if (specs->unsigned_p)
7542 error ("both %<unsigned%> and %<float%> in "
7543 "declaration specifiers");
7545 specs->typespec_word = cts_float;
7548 if (specs->long_long_p)
7549 error ("both %<long long%> and %<double%> in "
7550 "declaration specifiers");
7551 else if (specs->short_p)
7552 error ("both %<short%> and %<double%> in "
7553 "declaration specifiers");
7554 else if (specs->signed_p)
7555 error ("both %<signed%> and %<double%> in "
7556 "declaration specifiers");
7557 else if (specs->unsigned_p)
7558 error ("both %<unsigned%> and %<double%> in "
7559 "declaration specifiers");
7561 specs->typespec_word = cts_double;
7568 if (i == RID_DFLOAT32)
7570 else if (i == RID_DFLOAT64)
7573 str = "_Decimal128";
7574 if (specs->long_long_p)
7575 error ("both %<long long%> and %<%s%> in "
7576 "declaration specifiers", str);
7578 error ("both %<long%> and %<%s%> in "
7579 "declaration specifiers", str);
7580 else if (specs->short_p)
7581 error ("both %<short%> and %<%s%> in "
7582 "declaration specifiers", str);
7583 else if (specs->signed_p)
7584 error ("both %<signed%> and %<%s%> in "
7585 "declaration specifiers", str);
7586 else if (specs->unsigned_p)
7587 error ("both %<unsigned%> and %<%s%> in "
7588 "declaration specifiers", str);
7589 else if (specs->complex_p)
7590 error ("both %<complex%> and %<%s%> in "
7591 "declaration specifiers", str);
7592 else if (i == RID_DFLOAT32)
7593 specs->typespec_word = cts_dfloat32;
7594 else if (i == RID_DFLOAT64)
7595 specs->typespec_word = cts_dfloat64;
7597 specs->typespec_word = cts_dfloat128;
7599 if (!targetm.decimal_float_supported_p ())
7600 error ("decimal floating point not supported for this target");
7602 pedwarn ("ISO C does not support decimal floating point");
7605 /* ObjC reserved word "id", handled below. */
7611 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
7612 form of ObjC type, cases such as "int" and "long" being handled
7613 above), a TYPE (struct, union, enum and typeof specifiers) or an
7614 ERROR_MARK. In none of these cases may there have previously
7615 been any type specifiers. */
7616 if (specs->type || specs->typespec_word != cts_none
7617 || specs->long_p || specs->short_p || specs->signed_p
7618 || specs->unsigned_p || specs->complex_p)
7619 error ("two or more data types in declaration specifiers");
7620 else if (TREE_CODE (type) == TYPE_DECL)
7622 if (TREE_TYPE (type) == error_mark_node)
7623 ; /* Allow the type to default to int to avoid cascading errors. */
7626 specs->type = TREE_TYPE (type);
7627 specs->decl_attr = DECL_ATTRIBUTES (type);
7628 specs->typedef_p = true;
7629 specs->explicit_signed_p = C_TYPEDEF_EXPLICITLY_SIGNED (type);
7632 else if (TREE_CODE (type) == IDENTIFIER_NODE)
7634 tree t = lookup_name (type);
7635 if (!t || TREE_CODE (t) != TYPE_DECL)
7636 error ("%qE fails to be a typedef or built in type", type);
7637 else if (TREE_TYPE (t) == error_mark_node)
7640 specs->type = TREE_TYPE (t);
7642 else if (TREE_CODE (type) != ERROR_MARK)
7644 if (spec.kind == ctsk_tagdef || spec.kind == ctsk_tagfirstref)
7645 specs->tag_defined_p = true;
7646 if (spec.kind == ctsk_typeof)
7647 specs->typedef_p = true;
7654 /* Add the storage class specifier or function specifier SCSPEC to the
7655 declaration specifiers SPECS, returning SPECS. */
7657 struct c_declspecs *
7658 declspecs_add_scspec (struct c_declspecs *specs, tree scspec)
7661 enum c_storage_class n = csc_none;
7663 specs->declspecs_seen_p = true;
7664 gcc_assert (TREE_CODE (scspec) == IDENTIFIER_NODE
7665 && C_IS_RESERVED_WORD (scspec));
7666 i = C_RID_CODE (scspec);
7667 if (extra_warnings && specs->non_sc_seen_p)
7668 warning (OPT_Wextra, "%qE is not at beginning of declaration", scspec);
7672 /* C99 permits duplicate inline. Although of doubtful utility,
7673 it seems simplest to permit it in gnu89 mode as well, as
7674 there is also little utility in maintaining this as a
7675 difference between gnu89 and C99 inline. */
7677 specs->inline_p = true;
7680 dupe = specs->thread_p;
7681 if (specs->storage_class == csc_auto)
7682 error ("%<__thread%> used with %<auto%>");
7683 else if (specs->storage_class == csc_register)
7684 error ("%<__thread%> used with %<register%>");
7685 else if (specs->storage_class == csc_typedef)
7686 error ("%<__thread%> used with %<typedef%>");
7688 specs->thread_p = true;
7695 /* Diagnose "__thread extern". */
7696 if (specs->thread_p)
7697 error ("%<__thread%> before %<extern%>");
7704 /* Diagnose "__thread static". */
7705 if (specs->thread_p)
7706 error ("%<__thread%> before %<static%>");
7714 if (n != csc_none && n == specs->storage_class)
7717 error ("duplicate %qE", scspec);
7720 if (specs->storage_class != csc_none && n != specs->storage_class)
7722 error ("multiple storage classes in declaration specifiers");
7726 specs->storage_class = n;
7727 if (n != csc_extern && n != csc_static && specs->thread_p)
7729 error ("%<__thread%> used with %qE", scspec);
7730 specs->thread_p = false;
7737 /* Add the attributes ATTRS to the declaration specifiers SPECS,
7740 struct c_declspecs *
7741 declspecs_add_attrs (struct c_declspecs *specs, tree attrs)
7743 specs->attrs = chainon (attrs, specs->attrs);
7744 specs->declspecs_seen_p = true;
7748 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
7749 specifiers with any other type specifier to determine the resulting
7750 type. This is where ISO C checks on complex types are made, since
7751 "_Complex long" is a prefix of the valid ISO C type "_Complex long
7754 struct c_declspecs *
7755 finish_declspecs (struct c_declspecs *specs)
7757 /* If a type was specified as a whole, we have no modifiers and are
7759 if (specs->type != NULL_TREE)
7761 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
7762 && !specs->signed_p && !specs->unsigned_p
7763 && !specs->complex_p);
7767 /* If none of "void", "_Bool", "char", "int", "float" or "double"
7768 has been specified, treat it as "int" unless "_Complex" is
7769 present and there are no other specifiers. If we just have
7770 "_Complex", it is equivalent to "_Complex double", but e.g.
7771 "_Complex short" is equivalent to "_Complex short int". */
7772 if (specs->typespec_word == cts_none)
7774 if (specs->long_p || specs->short_p
7775 || specs->signed_p || specs->unsigned_p)
7777 specs->typespec_word = cts_int;
7779 else if (specs->complex_p)
7781 specs->typespec_word = cts_double;
7783 pedwarn ("ISO C does not support plain %<complex%> meaning "
7784 "%<double complex%>");
7788 specs->typespec_word = cts_int;
7789 specs->default_int_p = true;
7790 /* We don't diagnose this here because grokdeclarator will
7791 give more specific diagnostics according to whether it is
7792 a function definition. */
7796 /* If "signed" was specified, record this to distinguish "int" and
7797 "signed int" in the case of a bit-field with
7798 -funsigned-bitfields. */
7799 specs->explicit_signed_p = specs->signed_p;
7801 /* Now compute the actual type. */
7802 switch (specs->typespec_word)
7805 gcc_assert (!specs->long_p && !specs->short_p
7806 && !specs->signed_p && !specs->unsigned_p
7807 && !specs->complex_p);
7808 specs->type = void_type_node;
7811 gcc_assert (!specs->long_p && !specs->short_p
7812 && !specs->signed_p && !specs->unsigned_p
7813 && !specs->complex_p);
7814 specs->type = boolean_type_node;
7817 gcc_assert (!specs->long_p && !specs->short_p);
7818 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7819 if (specs->signed_p)
7820 specs->type = signed_char_type_node;
7821 else if (specs->unsigned_p)
7822 specs->type = unsigned_char_type_node;
7824 specs->type = char_type_node;
7825 if (specs->complex_p)
7828 pedwarn ("ISO C does not support complex integer types");
7829 specs->type = build_complex_type (specs->type);
7833 gcc_assert (!(specs->long_p && specs->short_p));
7834 gcc_assert (!(specs->signed_p && specs->unsigned_p));
7835 if (specs->long_long_p)
7836 specs->type = (specs->unsigned_p
7837 ? long_long_unsigned_type_node
7838 : long_long_integer_type_node);
7839 else if (specs->long_p)
7840 specs->type = (specs->unsigned_p
7841 ? long_unsigned_type_node
7842 : long_integer_type_node);
7843 else if (specs->short_p)
7844 specs->type = (specs->unsigned_p
7845 ? short_unsigned_type_node
7846 : short_integer_type_node);
7848 specs->type = (specs->unsigned_p
7849 ? unsigned_type_node
7850 : integer_type_node);
7851 if (specs->complex_p)
7854 pedwarn ("ISO C does not support complex integer types");
7855 specs->type = build_complex_type (specs->type);
7859 gcc_assert (!specs->long_p && !specs->short_p
7860 && !specs->signed_p && !specs->unsigned_p);
7861 specs->type = (specs->complex_p
7862 ? complex_float_type_node
7866 gcc_assert (!specs->long_long_p && !specs->short_p
7867 && !specs->signed_p && !specs->unsigned_p);
7870 specs->type = (specs->complex_p
7871 ? complex_long_double_type_node
7872 : long_double_type_node);
7876 specs->type = (specs->complex_p
7877 ? complex_double_type_node
7878 : double_type_node);
7884 gcc_assert (!specs->long_p && !specs->long_long_p && !specs->short_p
7885 && !specs->signed_p && !specs->unsigned_p && !specs->complex_p);
7886 if (specs->typespec_word == cts_dfloat32)
7887 specs->type = dfloat32_type_node;
7888 else if (specs->typespec_word == cts_dfloat64)
7889 specs->type = dfloat64_type_node;
7891 specs->type = dfloat128_type_node;
7900 /* Synthesize a function which calls all the global ctors or global
7901 dtors in this file. This is only used for targets which do not
7902 support .ctors/.dtors sections. FIXME: Migrate into cgraph. */
7904 build_cdtor (int method_type, tree cdtors)
7911 for (; cdtors; cdtors = TREE_CHAIN (cdtors))
7912 append_to_statement_list (build_function_call (TREE_VALUE (cdtors), 0),
7915 cgraph_build_static_cdtor (method_type, body, DEFAULT_INIT_PRIORITY);
7918 /* A subroutine of c_write_global_declarations. Perform final processing
7919 on one file scope's declarations (or the external scope's declarations),
7923 c_write_global_declarations_1 (tree globals)
7928 /* Process the decls in the order they were written. */
7929 for (decl = globals; decl; decl = TREE_CHAIN (decl))
7931 /* Check for used but undefined static functions using the C
7932 standard's definition of "used", and set TREE_NO_WARNING so
7933 that check_global_declarations doesn't repeat the check. */
7934 if (TREE_CODE (decl) == FUNCTION_DECL
7935 && DECL_INITIAL (decl) == 0
7936 && DECL_EXTERNAL (decl)
7937 && !TREE_PUBLIC (decl)
7938 && C_DECL_USED (decl))
7940 pedwarn ("%q+F used but never defined", decl);
7941 TREE_NO_WARNING (decl) = 1;
7944 wrapup_global_declaration_1 (decl);
7950 for (decl = globals; decl; decl = TREE_CHAIN (decl))
7951 reconsider |= wrapup_global_declaration_2 (decl);
7955 for (decl = globals; decl; decl = TREE_CHAIN (decl))
7956 check_global_declaration_1 (decl);
7959 /* A subroutine of c_write_global_declarations Emit debug information for each
7960 of the declarations in GLOBALS. */
7963 c_write_global_declarations_2 (tree globals)
7967 for (decl = globals; decl ; decl = TREE_CHAIN (decl))
7968 debug_hooks->global_decl (decl);
7971 /* Preserve the external declarations scope across a garbage collect. */
7972 static GTY(()) tree ext_block;
7975 c_write_global_declarations (void)
7979 /* We don't want to do this if generating a PCH. */
7983 /* Don't waste time on further processing if -fsyntax-only or we've
7984 encountered errors. */
7985 if (flag_syntax_only || errorcount || sorrycount || cpp_errors (parse_in))
7988 /* Close the external scope. */
7989 ext_block = pop_scope ();
7991 gcc_assert (!current_scope);
7995 tree tmp = BLOCK_VARS (ext_block);
7997 FILE * stream = dump_begin (TDI_tu, &flags);
8000 dump_node (tmp, flags & ~TDF_SLIM, stream);
8001 dump_end (TDI_tu, stream);
8005 /* Process all file scopes in this compilation, and the external_scope,
8006 through wrapup_global_declarations and check_global_declarations. */
8007 for (t = all_translation_units; t; t = TREE_CHAIN (t))
8008 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
8009 c_write_global_declarations_1 (BLOCK_VARS (ext_block));
8011 /* Generate functions to call static constructors and destructors
8012 for targets that do not support .ctors/.dtors sections. These
8013 functions have magic names which are detected by collect2. */
8014 build_cdtor ('I', static_ctors); static_ctors = 0;
8015 build_cdtor ('D', static_dtors); static_dtors = 0;
8017 /* We're done parsing; proceed to optimize and emit assembly.
8018 FIXME: shouldn't be the front end's responsibility to call this. */
8021 /* After cgraph has had a chance to emit everything that's going to
8022 be emitted, output debug information for globals. */
8023 if (errorcount == 0 && sorrycount == 0)
8025 timevar_push (TV_SYMOUT);
8026 for (t = all_translation_units; t; t = TREE_CHAIN (t))
8027 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t)));
8028 c_write_global_declarations_2 (BLOCK_VARS (ext_block));
8029 timevar_pop (TV_SYMOUT);
8035 #include "gt-c-decl.h"