1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
31 #include "coretypes.h"
35 #include "tree-inline.h"
56 #include "langhooks-def.h"
58 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
60 { NORMAL, /* Ordinary declaration */
61 FUNCDEF, /* Function definition */
62 PARM, /* Declaration of parm before function body */
63 FIELD, /* Declaration inside struct or union */
64 TYPENAME}; /* Typename (inside cast or sizeof) */
67 /* Nonzero if we have seen an invalid cross reference
68 to a struct, union, or enum, but not yet printed the message. */
70 tree pending_invalid_xref;
71 /* File and line to appear in the eventual error message. */
72 location_t pending_invalid_xref_location;
74 /* While defining an enum type, this is 1 plus the last enumerator
75 constant value. Note that will do not have to save this or `enum_overflow'
76 around nested function definition since such a definition could only
77 occur in an enum value expression and we don't use these variables in
80 static tree enum_next_value;
82 /* Nonzero means that there was overflow computing enum_next_value. */
84 static int enum_overflow;
86 /* Parsing a function declarator leaves a list of parameter names
87 or a chain of parameter decls here. */
89 static tree last_function_parms;
91 /* ... and a chain of structure and enum types declared in the
94 static tree last_function_parm_tags;
96 /* ... and a chain of all non-parameter declarations (such as
97 CONST_DECLs from enumerations) here. */
99 static tree last_function_parm_others;
101 /* After parsing the declarator that starts a function definition,
102 `start_function' puts the list of parameter names or chain of decls here
103 for `store_parm_decls' to find. */
105 static tree current_function_parms;
107 /* Similar, for last_function_parm_tags. */
109 static tree current_function_parm_tags;
111 /* And for last_function_parm_others. */
113 static tree current_function_parm_others;
115 /* Similar, for the file and line that the prototype came from if this is
116 an old-style definition. */
118 static location_t current_function_prototype_locus;
120 /* The current statement tree. */
122 static GTY(()) struct stmt_tree_s c_stmt_tree;
124 /* The current scope statement stack. */
126 static GTY(()) tree c_scope_stmt_stack;
128 /* State saving variables. */
129 int c_in_iteration_stmt;
132 /* A list of external DECLs that appeared at block scope when there was
133 some other global meaning for that identifier. */
134 static GTY(()) tree truly_local_externals;
136 /* All the builtins; this is a subset of the entries of global_scope. */
138 static GTY(()) tree first_builtin_decl;
139 static GTY(()) tree last_builtin_decl;
141 /* A DECL for the current file-scope context. */
143 static GTY(()) tree current_file_decl;
145 /* Set to 0 at beginning of a function definition, set to 1 if
146 a return statement that specifies a return value is seen. */
148 int current_function_returns_value;
150 /* Set to 0 at beginning of a function definition, set to 1 if
151 a return statement with no argument is seen. */
153 int current_function_returns_null;
155 /* Set to 0 at beginning of a function definition, set to 1 if
156 a call to a noreturn function is seen. */
158 int current_function_returns_abnormally;
160 /* Set to nonzero by `grokdeclarator' for a function
161 whose return type is defaulted, if warnings for this are desired. */
163 static int warn_about_return_type;
165 /* Nonzero when starting a function declared `extern inline'. */
167 static int current_extern_inline;
169 /* Each c_scope structure describes the complete contents of one scope.
170 Three scopes are distinguished specially: the innermost or current
171 scope, the innermost function scope, and the outermost or file scope.
173 Most declarations are recorded in the current scope.
175 All normal label declarations are recorded in the innermost
176 function scope, as are bindings of undeclared identifiers to
177 error_mark_node. (GCC permits nested functions as an extension,
178 hence the 'innermost' qualifier.) Explicitly declared labels
179 (using the __label__ extension) appear in the current scope.
181 Being in the global scope (current_scope == global_scope) causes
182 special behavior in several places below. Also, under some
183 conditions the Objective-C front end records declarations in the
184 global scope even though that isn't the current scope.
186 The order of the names, parms, and blocks lists matters, and they
187 are frequently appended to. To avoid having to walk all the way to
188 the end of the list on each insertion, or reverse the lists later,
189 we maintain a pointer to the last list entry for each of the lists.
191 The order of the tags, shadowed, and shadowed_tags
192 lists does not matter, so we just prepend to these lists. */
194 struct c_scope GTY(())
196 /* The scope containing this one. */
197 struct c_scope *outer;
199 /* The next outermost function scope. */
200 struct c_scope *outer_function;
202 /* All variables, constants, functions, labels, and typedef names. */
206 /* All parameter declarations. Used only in the outermost scope of
211 /* All structure, union, and enum type tags. */
214 /* For each scope, a list of shadowed outer-scope definitions
215 to be restored when this scope is popped.
216 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
217 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
220 /* For each scope, a list of shadowed outer-scope tag definitions
221 to be restored when this scope is popped.
222 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
223 whose TREE_VALUE is its old definition (a kind of ..._TYPE node). */
226 /* For each scope (except the global one), a chain of BLOCK nodes
227 for all the scopes that were entered and exited one level down. */
231 /* True if we are currently filling this scope with parameter
235 /* True if we already complained about forward parameter decls
236 in this scope. This prevents double warnings on
237 foo (int a; int b; ...) */
238 bool warned_forward_parm_decls : 1;
240 /* True if this is the outermost block scope of a function body.
241 This scope contains the parameters, the local variables declared
242 in the outermost block, and all the labels (except those in
243 nested functions, or declared at block scope with __label__). */
244 bool function_body : 1;
246 /* True means make a BLOCK for this scope no matter what. */
250 /* The scope currently in effect. */
252 static GTY(()) struct c_scope *current_scope;
254 /* A chain of c_scope structures awaiting reuse. */
256 static GTY((deletable (""))) struct c_scope *scope_freelist;
258 /* The innermost function scope. Ordinary (not explicitly declared)
259 labels, bindings to error_mark_node, and the lazily-created
260 bindings of __func__ and its friends get this scope. */
262 static GTY(()) struct c_scope *current_function_scope;
264 /* The outermost scope, corresponding to the C "file scope". This is
265 created when the compiler is started and exists through the entire run. */
267 static GTY(()) struct c_scope *global_scope;
269 /* Append VAR to LIST in scope SCOPE. */
270 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
271 struct c_scope *s_ = (scope); \
273 if (s_->list##_last) \
274 TREE_CHAIN (s_->list##_last) = d_; \
277 s_->list##_last = d_; \
280 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
281 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
282 struct c_scope *t_ = (tscope); \
283 struct c_scope *f_ = (fscope); \
285 TREE_CHAIN (t_->to##_last) = f_->from; \
288 t_->to##_last = f_->from##_last; \
291 /* True means unconditionally make a BLOCK for the next scope pushed. */
293 static bool keep_next_level_flag;
295 /* True means the next call to pushlevel will be the outermost scope
296 of a function body, so do not push a new scope, merely cease
297 expecting parameter decls. */
299 static bool next_is_function_body;
301 /* Functions called automatically at the beginning and end of execution. */
303 tree static_ctors, static_dtors;
305 /* Forward declarations. */
307 static struct c_scope *make_scope (void);
308 static void pop_scope (void);
309 static tree make_label (tree, location_t);
310 static void bind_label (tree, tree, struct c_scope *);
311 static void implicit_decl_warning (tree);
312 static tree lookup_tag (enum tree_code, tree, int);
313 static tree lookup_name_current_level (tree);
314 static tree grokdeclarator (tree, tree, enum decl_context, int, tree *);
315 static tree grokparms (tree, int);
316 static void layout_array_type (tree);
317 static void store_parm_decls_newstyle (void);
318 static void store_parm_decls_oldstyle (void);
319 static tree c_make_fname_decl (tree, int);
320 static void c_expand_body_1 (tree, int);
321 static tree any_external_decl (tree);
322 static void record_external_decl (tree);
323 static void warn_if_shadowing (tree, tree);
324 static void check_bitfield_type_and_width (tree *, tree *, const char *);
325 static void clone_underlying_type (tree);
326 static bool flexible_array_type_p (tree);
327 static hashval_t link_hash_hash (const void *);
328 static int link_hash_eq (const void *, const void *);
330 /* States indicating how grokdeclarator() should handle declspecs marked
331 with __attribute__((deprecated)). An object declared as
332 __attribute__((deprecated)) suppresses warnings of uses of other
335 enum deprecated_states {
340 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
343 c_print_identifier (FILE *file, tree node, int indent)
345 print_node (file, "symbol", IDENTIFIER_SYMBOL_VALUE (node), indent + 4);
346 print_node (file, "tag", IDENTIFIER_TAG_VALUE (node), indent + 4);
347 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
348 if (C_IS_RESERVED_WORD (node))
350 tree rid = ridpointers[C_RID_CODE (node)];
351 indent_to (file, indent + 4);
352 fprintf (file, "rid " HOST_PTR_PRINTF " \"%s\"",
353 (void *) rid, IDENTIFIER_POINTER (rid));
357 /* Hook called at end of compilation to assume 1 elt
358 for a file-scope tentative array defn that wasn't complete before. */
361 c_finish_incomplete_decl (tree decl)
363 if (TREE_CODE (decl) == VAR_DECL)
365 tree type = TREE_TYPE (decl);
366 if (type != error_mark_node
367 && TREE_CODE (type) == ARRAY_TYPE
368 && ! DECL_EXTERNAL (decl)
369 && TYPE_DOMAIN (type) == 0)
371 warning ("%Jarray '%D' assumed to have one element", decl, decl);
373 complete_array_type (type, NULL_TREE, 1);
375 layout_decl (decl, 0);
380 /* Reuse or create a struct for this scope. */
382 static struct c_scope *
385 struct c_scope *result;
388 result = scope_freelist;
389 scope_freelist = result->outer;
392 result = ggc_alloc_cleared (sizeof (struct c_scope));
397 /* Remove the topmost scope from the stack and add it to the
398 free list, updating current_function_scope if necessary. */
403 struct c_scope *scope = current_scope;
405 current_scope = scope->outer;
406 if (scope->function_body)
407 current_function_scope = scope->outer_function;
409 memset (scope, 0, sizeof (struct c_scope));
410 scope->outer = scope_freelist;
411 scope_freelist = scope;
414 /* The Objective-C front-end often needs to determine the current scope. */
417 get_current_scope (void)
419 return current_scope;
422 /* The following function is used only by Objective-C. It needs to live here
423 because it accesses the innards of c_scope. */
426 objc_mark_locals_volatile (void *enclosing_blk)
428 struct c_scope *scope;
430 for (scope = current_scope;
431 scope && scope != enclosing_blk;
432 scope = scope->outer)
436 for (decl = scope->names; decl; decl = TREE_CHAIN (decl))
438 DECL_REGISTER (decl) = 0;
439 TREE_THIS_VOLATILE (decl) = 1;
441 /* Do not climb up past the current function. */
442 if (scope->function_body)
447 /* Nonzero if we are currently in the global scope. */
450 global_bindings_p (void)
452 return current_scope == global_scope;
456 keep_next_level (void)
458 keep_next_level_flag = true;
461 /* Identify this scope as currently being filled with parameters. */
464 declare_parm_level (void)
466 current_scope->parm_flag = true;
469 /* Nonzero if currently making parm declarations. */
472 in_parm_level_p (void)
474 return current_scope->parm_flag;
477 /* Enter a new scope. The dummy parameter is for signature
478 compatibility with lang_hooks.decls.pushlevel. */
481 pushlevel (int dummy ATTRIBUTE_UNUSED)
483 if (next_is_function_body)
485 /* This is the transition from the parameters to the top level
486 of the function body. These are the same scope
487 (C99 6.2.1p4,6) so we do not push another scope structure.
488 next_is_function_body is set only by store_parm_decls, which
489 in turn is called when and only when we are about to
490 encounter the opening curly brace for the function body.
492 The outermost block of a function always gets a BLOCK node,
493 because the debugging output routines expect that each
494 function has at least one BLOCK. */
495 current_scope->parm_flag = false;
496 current_scope->function_body = true;
497 current_scope->keep = true;
498 current_scope->outer_function = current_function_scope;
499 current_function_scope = current_scope;
501 keep_next_level_flag = false;
502 next_is_function_body = false;
506 struct c_scope *scope = make_scope ();
508 scope->keep = keep_next_level_flag;
509 scope->outer = current_scope;
510 current_scope = scope;
511 keep_next_level_flag = false;
515 /* Exit a scope. Restore the state of the identifier-decl mappings
516 that were in effect when this scope was entered.
518 If KEEP is KEEP_YES (1), this scope had explicit declarations, so
519 create a BLOCK node to record its declarations and subblocks for
520 debugging output. If KEEP is KEEP_MAYBE, do so only if the names
521 or tags lists are nonempty.
523 The second parameter is ignored; it is present only for
524 signature compatibility with lang_hooks.decls.poplevel.
526 If FUNCTIONBODY is nonzero, this level is the body of a function,
527 even if current_scope->function_body is not set. This is used
528 by language-independent code that generates synthetic functions,
529 and cannot set current_scope->function_body.
531 FIXME: Eliminate the need for all arguments. */
534 poplevel (int keep, int dummy ATTRIBUTE_UNUSED, int functionbody)
536 struct c_scope *scope = current_scope;
541 /* The following line does not use |= due to a bug in HP's C compiler. */
542 scope->function_body = scope->function_body | functionbody;
544 if (keep == KEEP_MAYBE)
545 keep = (scope->names || scope->tags);
548 keep |= scope->function_body;
550 /* If appropriate, create a BLOCK to record the decls for the life
555 block = make_node (BLOCK);
556 BLOCK_VARS (block) = scope->names;
557 BLOCK_SUBBLOCKS (block) = scope->blocks;
558 TREE_USED (block) = 1;
561 /* In each subblock, record that this is its superior. */
562 for (p = scope->blocks; p; p = TREE_CHAIN (p))
563 BLOCK_SUPERCONTEXT (p) = block;
565 /* Clear out the variable bindings in this scope.
567 Propagate TREE_ADDRESSABLE from nested functions to their
568 containing functions.
570 Issue warnings for unused variables and labels, and errors for
571 undefined labels, if there are any. */
573 for (p = scope->names; p; p = TREE_CHAIN (p))
575 switch (TREE_CODE (p))
578 if (TREE_USED (p) && !DECL_INITIAL (p))
580 error ("%Jlabel `%D' used but not defined", p, p);
581 DECL_INITIAL (p) = error_mark_node;
583 else if (!TREE_USED (p) && warn_unused_label)
585 if (DECL_INITIAL (p))
586 warning ("%Jlabel `%D' defined but not used", p, p);
588 warning ("%Jlabel `%D' declared but not defined", p, p);
591 IDENTIFIER_LABEL_VALUE (DECL_NAME (p)) = 0;
595 if (! TREE_ASM_WRITTEN (p)
596 && DECL_INITIAL (p) != 0
597 && TREE_ADDRESSABLE (p)
598 && DECL_ABSTRACT_ORIGIN (p) != 0
599 && DECL_ABSTRACT_ORIGIN (p) != p)
600 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
604 /* Keep this in sync with stmt.c:warn_about_unused_variables.
605 No warnings when the global scope is popped because the
606 global scope isn't popped for the last translation unit,
607 so the warnings are done in c_write_global_declaration. */
608 if (warn_unused_variable && scope != global_scope
610 && !DECL_IN_SYSTEM_HEADER (p)
612 && !DECL_ARTIFICIAL (p))
613 warning ("%Junused variable `%D'", p, p);
620 if (DECL_EXTERNAL (p) && scope != global_scope)
621 /* External decls stay in the symbol-value slot but are
623 C_DECL_INVISIBLE (p) = 1;
625 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (p)) = 0;
631 /* Clear out the parameter bindings in this scope, if any.
632 Unused-parameter warnings are handled by function.c. */
633 for (p = scope->parms; p; p = TREE_CHAIN (p))
635 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (p)) = 0;
637 /* Clear out the tag-meanings declared in this scope.
639 Set the TYPE_CONTEXTs for all of the tagged types belonging to
640 this scope so that they point to the appropriate construct, i.e.
641 either to the current FUNCTION_DECL node, or else to the BLOCK
642 node we just constructed.
644 Note that for tagged types whose scope is just the formal
645 parameter list for some function type specification, we can't
646 properly set their TYPE_CONTEXTs here, because we don't have a
647 pointer to the appropriate FUNCTION_TYPE node readily available
648 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
649 type nodes get set in `grokdeclarator' as soon as we have created
650 the FUNCTION_TYPE node which will represent the "scope" for these
651 "parameter list local" tagged types. */
653 decl = scope->function_body ? current_function_decl : block;
654 for (p = scope->tags; p; p = TREE_CHAIN (p))
656 if (TREE_PURPOSE (p))
657 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (p)) = 0;
659 TYPE_CONTEXT (TREE_VALUE (p)) = decl;
662 /* Restore all name- and label-meanings from outer scopes that were
663 shadowed by this scope. */
664 for (p = scope->shadowed; p; p = TREE_CHAIN (p))
665 if (TREE_VALUE (p) && TREE_CODE (TREE_VALUE (p)) == LABEL_DECL)
666 IDENTIFIER_LABEL_VALUE (TREE_PURPOSE (p)) = TREE_VALUE (p);
668 IDENTIFIER_SYMBOL_VALUE (TREE_PURPOSE (p)) = TREE_VALUE (p);
670 /* Restore all tag-meanings from outer scopes that were shadowed by
672 for (p = scope->shadowed_tags; p; p = TREE_CHAIN (p))
673 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (p)) = TREE_VALUE (p);
675 /* Dispose of the block that we just made inside some higher level. */
676 if (scope->function_body && current_function_decl)
677 DECL_INITIAL (current_function_decl) = block;
678 else if (scope->outer)
681 SCOPE_LIST_APPEND (scope->outer, blocks, block);
682 /* If we did not make a block for the scope just exited, any
683 blocks made for inner scopes must be carried forward so they
684 will later become subblocks of something else. */
685 else if (scope->blocks)
686 SCOPE_LIST_CONCAT (scope->outer, blocks, scope, blocks);
689 /* Pop the current scope, and free the structure for reuse. */
695 /* Insert BLOCK at the end of the list of subblocks of the current
696 scope. This is used when a BIND_EXPR is expanded, to handle the
697 BLOCK node inside the BIND_EXPR. */
700 insert_block (tree block)
702 TREE_USED (block) = 1;
703 SCOPE_LIST_APPEND (current_scope, blocks, block);
706 /* Set the BLOCK node for the innermost scope (the one we are
707 currently in). The RTL expansion machinery requires us to provide
708 this hook, but it is not useful in function-at-a-time mode. */
711 set_block (tree block ATTRIBUTE_UNUSED)
715 /* Push a definition or a declaration of struct, union or enum tag "name".
716 "type" should be the type node.
717 We assume that the tag "name" is not already defined.
719 Note that the definition may really be just a forward reference.
720 In that case, the TYPE_SIZE will be zero. */
723 pushtag (tree name, tree type)
725 struct c_scope *b = current_scope;
727 /* Record the identifier as the type's name if it has none. */
730 if (TYPE_NAME (type) == 0)
731 TYPE_NAME (type) = name;
733 if (IDENTIFIER_TAG_VALUE (name))
734 b->shadowed_tags = tree_cons (name, IDENTIFIER_TAG_VALUE (name),
736 IDENTIFIER_TAG_VALUE (name) = type;
739 b->tags = tree_cons (name, type, b->tags);
741 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
742 tagged type we just added to the current scope. This fake
743 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
744 to output a representation of a tagged type, and it also gives
745 us a convenient place to record the "scope start" address for the
748 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
750 /* An approximation for now, so we can tell this is a function-scope tag.
751 This will be updated in poplevel. */
752 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
755 /* Subroutine of compare_decls. Allow harmless mismatches in return
756 and argument types provided that the type modes match. This function
757 return a unified type given a suitable match, and 0 otherwise. */
760 match_builtin_function_types (tree newtype, tree oldtype)
762 tree newrettype, oldrettype;
763 tree newargs, oldargs;
764 tree trytype, tryargs;
766 /* Accept the return type of the new declaration if same modes. */
767 oldrettype = TREE_TYPE (oldtype);
768 newrettype = TREE_TYPE (newtype);
770 if (TYPE_MODE (oldrettype) != TYPE_MODE (newrettype))
773 oldargs = TYPE_ARG_TYPES (oldtype);
774 newargs = TYPE_ARG_TYPES (newtype);
777 while (oldargs || newargs)
781 || ! TREE_VALUE (oldargs)
782 || ! TREE_VALUE (newargs)
783 || TYPE_MODE (TREE_VALUE (oldargs))
784 != TYPE_MODE (TREE_VALUE (newargs)))
787 oldargs = TREE_CHAIN (oldargs);
788 newargs = TREE_CHAIN (newargs);
791 trytype = build_function_type (newrettype, tryargs);
792 return build_type_attribute_variant (trytype, TYPE_ATTRIBUTES (oldtype));
795 /* Subroutine of diagnose_mismathed_decls. Check for function type
796 mismatch involving an empty arglist vs a nonempty one and give clearer
799 diagnose_arglist_conflict (tree newdecl, tree olddecl,
800 tree newtype, tree oldtype)
804 if (TREE_CODE (olddecl) != FUNCTION_DECL
805 || !comptypes (TREE_TYPE (oldtype), TREE_TYPE (newtype), COMPARE_STRICT)
806 || !((TYPE_ARG_TYPES (oldtype) == 0 && DECL_INITIAL (olddecl) == 0)
808 (TYPE_ARG_TYPES (newtype) == 0 && DECL_INITIAL (newdecl) == 0)))
811 t = TYPE_ARG_TYPES (oldtype);
813 t = TYPE_ARG_TYPES (newtype);
814 for (; t; t = TREE_CHAIN (t))
816 tree type = TREE_VALUE (t);
818 if (TREE_CHAIN (t) == 0
819 && TYPE_MAIN_VARIANT (type) != void_type_node)
821 inform ("a parameter list with an ellipsis can't match "
822 "an empty parameter name list declaration");
826 if (c_type_promotes_to (type) != type)
828 inform ("an argument type that has a default promotion can't match "
829 "an empty parameter name list declaration");
835 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
836 old-style function definition, NEWDECL is a prototype declaration.
837 Diagnose inconsistencies in the argument list. Returns TRUE if
838 the prototype is compatible, FALSE if not. */
840 validate_proto_after_old_defn (tree newdecl, tree newtype, tree oldtype)
844 /* Prototype decl follows defn w/o prototype. */
846 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
847 type = TYPE_ARG_TYPES (newtype),
850 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
852 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
853 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
856 warning ("%Jprototype for '%D' follows non-prototype definition",
861 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
862 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
864 error ("%Jprototype for '%D' with different number of arguments "
865 "follows non-prototype definition", newdecl, newdecl);
868 /* Type for passing arg must be consistent
869 with that declared for the arg. */
870 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type),
873 error ("%Jprototype for '%D' with incompatible argument %d "
874 "follows non-prototype definition", newdecl, newdecl, nargs);
880 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
881 first in a pair of mismatched declarations, using the diagnostic
884 locate_old_decl (tree decl, void (*diag)(const char *, ...))
886 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
888 else if (DECL_INITIAL (decl))
889 diag (N_("%Jprevious definition of '%D' was here"), decl, decl);
890 else if (C_DECL_IMPLICIT (decl))
891 diag (N_("%Jprevious implicit declaration of '%D' was here"), decl, decl);
893 diag (N_("%Jprevious declaration of '%D' was here"), decl, decl);
896 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
897 Returns true if the caller should proceed to merge the two, false
898 if OLDDECL should simply be discarded. As a side effect, issues
899 all necessary diagnostics for invalid or poor-style combinations.
900 If it returns true, writes the types of NEWDECL and OLDDECL to
901 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
902 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
905 diagnose_mismatched_decls (tree newdecl, tree olddecl,
906 tree *newtypep, tree *oldtypep)
908 tree newtype, oldtype;
909 bool pedwarned = false;
912 /* If we have error_mark_node for either decl or type, just discard
913 the previous decl - we're in an error cascade already. */
914 if (olddecl == error_mark_node || newdecl == error_mark_node)
916 oldtype = TREE_TYPE (olddecl);
917 newtype = TREE_TYPE (newdecl);
918 if (oldtype == error_mark_node || newtype == error_mark_node)
921 /* Two different categories of symbol altogether. This is an error
922 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
923 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
925 if (TREE_CODE (olddecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
927 error ("%J'%D' redeclared as different kind of symbol",
929 locate_old_decl (olddecl, error);
931 else if (TREE_PUBLIC (newdecl))
932 warning ("%Jbuilt-in function '%D' declared as non-function",
934 else if (warn_shadow)
935 warning ("%Jshadowing built-in function '%D'",
940 if (!comptypes (oldtype, newtype, COMPARE_STRICT))
942 if (TREE_CODE (olddecl) == FUNCTION_DECL && DECL_BUILT_IN (olddecl))
944 /* Accept harmless mismatch in function types.
945 This is for the ffs and fprintf builtins. */
946 tree trytype = match_builtin_function_types (newtype, oldtype);
948 if (trytype && comptypes (newtype, trytype, COMPARE_STRICT))
952 /* If types don't match for a built-in, throw away the
953 built-in. No point in calling locate_old_decl here, it
954 won't print anything. */
955 warning ("%Jconflicting types for built-in function '%D'",
960 else if (TREE_CODE (olddecl) == FUNCTION_DECL
961 && DECL_SOURCE_LINE (olddecl) == 0)
963 /* A conflicting function declaration for a predeclared
964 function that isn't actually built in. Objective C uses
965 these. The new declaration silently overrides everything
966 but the volatility (i.e. noreturn) indication. See also
967 below. FIXME: Make Objective C use normal builtins. */
968 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
971 /* Permit void foo (...) to match int foo (...) if the latter is
972 the definition and implicit int was used. See
973 c-torture/compile/920625-2.c. */
974 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
975 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
976 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
977 && C_FUNCTION_IMPLICIT_INT (newdecl))
979 pedwarn ("%Jconflicting types for '%D'", newdecl, newdecl);
980 /* Make sure we keep void as the return type. */
981 TREE_TYPE (newdecl) = newtype = oldtype;
982 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
987 error ("%Jconflicting types for '%D'", newdecl, newdecl);
988 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
989 locate_old_decl (olddecl, error);
994 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
995 but silently ignore the redeclaration if either is in a system
996 header. (Conflicting redeclarations were handled above.) */
997 if (TREE_CODE (newdecl) == TYPE_DECL)
999 if (DECL_IN_SYSTEM_HEADER (newdecl) || DECL_IN_SYSTEM_HEADER (olddecl))
1000 return true; /* allow OLDDECL to continue in use */
1002 error ("%Jredefinition of typedef '%D'", newdecl, newdecl);
1003 locate_old_decl (olddecl, error);
1007 /* Function declarations can either be 'static' or 'extern' (no
1008 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1009 can never conflict with each other on account of linkage (6.2.2p4).
1010 Multiple definitions are not allowed (6.9p3,5) but GCC permits
1011 two definitions if one is 'extern inline' and one is not. The non-
1012 extern-inline definition supersedes the extern-inline definition. */
1013 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1015 if (DECL_BUILT_IN (olddecl) && !TREE_PUBLIC (newdecl))
1017 /* If you declare a built-in function name as static, the
1018 built-in definition is overridden,
1019 but optionally warn this was a bad choice of name. */
1021 warning ("%Jshadowing built-in function '%D'", newdecl, newdecl);
1022 /* Discard the old built-in function. */
1026 if (DECL_INITIAL (newdecl))
1028 if (DECL_INITIAL (olddecl)
1029 && !(DECL_DECLARED_INLINE_P (olddecl)
1030 && DECL_EXTERNAL (olddecl)
1031 && !(DECL_DECLARED_INLINE_P (newdecl)
1032 && DECL_EXTERNAL (newdecl))))
1034 error ("%Jredefinition of '%D'", newdecl, newdecl);
1035 locate_old_decl (olddecl, error);
1039 /* If we have a prototype after an old-style function definition,
1040 the argument types must be checked specially. */
1041 else if (DECL_INITIAL (olddecl)
1042 && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype)
1043 && TYPE_ACTUAL_ARG_TYPES (oldtype)
1044 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
1046 locate_old_decl (olddecl, error);
1049 /* Mismatched non-static and static is considered poor style.
1050 We only diagnose static then non-static if -Wtraditional,
1051 because it is the most convenient way to get some effects
1052 (see e.g. what unwind-dw2-fde-glibc.c does to the definition
1053 of _Unwind_Find_FDE in unwind-dw2-fde.c). Revisit? */
1054 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
1056 /* A static function declaration for a predeclared function
1057 that isn't actually built in, silently overrides the
1058 default. Objective C uses these. See also above.
1059 FIXME: Make Objective C use normal builtins. */
1060 if (TREE_CODE (olddecl) == FUNCTION_DECL
1061 && DECL_SOURCE_LINE (olddecl) == 0)
1065 warning ("%Jstatic declaration of '%D' follows "
1066 "non-static declaration", newdecl, newdecl);
1070 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl)
1071 && warn_traditional)
1073 warning ("%Jnon-static declaration of '%D' follows "
1074 "static declaration", newdecl, newdecl);
1078 else if (TREE_CODE (newdecl) == VAR_DECL)
1080 /* Only variables can be thread-local, and all declarations must
1081 agree on this property. */
1082 if (DECL_THREAD_LOCAL (newdecl) != DECL_THREAD_LOCAL (olddecl))
1084 if (DECL_THREAD_LOCAL (newdecl))
1085 error ("%Jthread-local declaration of '%D' follows "
1086 "non-thread-local declaration", newdecl, newdecl);
1088 error ("%Jnon-thread-local declaration of '%D' follows "
1089 "thread-local declaration", newdecl, newdecl);
1091 locate_old_decl (olddecl, error);
1095 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1096 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
1098 error ("%Jredefinition of '%D'", newdecl, newdecl);
1099 locate_old_decl (olddecl, error);
1103 /* Objects declared at file scope: if at least one is 'extern',
1104 it's fine (6.2.2p4); otherwise the linkage must agree (6.2.2p7). */
1105 if (DECL_FILE_SCOPE_P (newdecl))
1107 if (!DECL_EXTERNAL (newdecl)
1108 && !DECL_EXTERNAL (olddecl)
1109 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
1111 if (TREE_PUBLIC (newdecl))
1112 error ("%Jnon-static declaration of '%D' follows "
1113 "static declaration", newdecl, newdecl);
1115 error ("%Jstatic declaration of '%D' follows "
1116 "non-static declaration", newdecl, newdecl);
1118 locate_old_decl (olddecl, error);
1122 /* Two objects with the same name declared at the same block
1123 scope must both be external references (6.7p3). */
1124 else if (DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl)
1125 && (!DECL_EXTERNAL (newdecl) || !DECL_EXTERNAL (olddecl)))
1127 if (DECL_EXTERNAL (newdecl))
1128 error ("%Jextern declaration of '%D' follows "
1129 "declaration with no linkage", newdecl, newdecl);
1130 else if (DECL_EXTERNAL (olddecl))
1131 error ("%Jdeclaration of '%D' with no linkage follows "
1132 "extern declaration", newdecl, newdecl);
1134 error ("%Jredeclaration of '%D' with no linkage",
1137 locate_old_decl (olddecl, error);
1143 /* All decls must agree on a non-default visibility. */
1144 if (DECL_VISIBILITY (newdecl) != VISIBILITY_DEFAULT
1145 && DECL_VISIBILITY (olddecl) != VISIBILITY_DEFAULT
1146 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1148 warning ("%Jredeclaration of '%D' with different visibility "
1149 "(old visibility preserved)", newdecl, newdecl);
1153 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1155 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
1156 if (DECL_DECLARED_INLINE_P (newdecl)
1157 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1159 warning ("%Jinline declaration of '%D' follows "
1160 "declaration with attribute noinline", newdecl, newdecl);
1163 else if (DECL_DECLARED_INLINE_P (olddecl)
1164 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1166 warning ("%Jdeclaration of '%D' with attribute noinline follows "
1167 "inline declaration ", newdecl, newdecl);
1171 /* Inline declaration after use or definition.
1172 ??? Should we still warn about this now we have unit-at-a-time
1173 mode and can get it right? */
1174 if (DECL_DECLARED_INLINE_P (newdecl) && !DECL_DECLARED_INLINE_P (olddecl))
1176 if (TREE_USED (olddecl))
1178 warning ("%J'%D' declared inline after being called",
1182 else if (DECL_INITIAL (olddecl))
1184 warning ("%J'%D' declared inline after its definition",
1192 /* These bits are only type qualifiers when applied to objects. */
1193 if (TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl))
1195 if (TREE_THIS_VOLATILE (newdecl))
1196 pedwarn ("%Jvolatile declaration of '%D' follows "
1197 "non-volatile declaration", newdecl, newdecl);
1199 pedwarn ("%Jnon-volatile declaration of '%D' follows "
1200 "volatile declaration", newdecl, newdecl);
1203 if (TREE_READONLY (newdecl) != TREE_READONLY (olddecl))
1205 if (TREE_READONLY (newdecl))
1206 pedwarn ("%Jconst declaration of '%D' follows "
1207 "non-const declaration", newdecl, newdecl);
1209 pedwarn ("%Jnon-const declaration of '%D' follows "
1210 "const declaration", newdecl, newdecl);
1215 /* Optional warning for completely redundant decls. */
1216 if (!warned && !pedwarned
1217 && warn_redundant_decls
1218 /* Don't warn about a function declaration followed by a
1220 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1221 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
1222 /* Don't warn about an extern followed by a definition. */
1223 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl)))
1225 warning ("%Jredundant redeclaration of '%D'", newdecl, newdecl);
1229 /* Report location of previous decl/defn in a consistent manner. */
1230 if (warned || pedwarned)
1231 locate_old_decl (olddecl, pedwarned ? pedwarn : warning);
1233 *newtypep = newtype;
1234 *oldtypep = oldtype;
1238 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1239 consistent with OLDDECL, but carries new information. Merge the
1240 new information into OLDDECL. If DIFFERENT_BINDING_LEVEL or
1241 DIFFERENT_TU is true, avoid completely merging the decls, as this
1242 will break assumptions elsewhere. This function issues no
1246 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype,
1247 bool different_binding_level, bool different_tu)
1249 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1250 && DECL_INITIAL (newdecl) != 0);
1252 /* When copying info to olddecl, we store into write_olddecl
1253 instead. This allows us to avoid modifying olddecl when
1254 different_binding_level is true. */
1255 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1257 /* For real parm decl following a forward decl, return 1 so old decl
1258 will be reused. Only allow this to happen once. */
1259 if (TREE_CODE (newdecl) == PARM_DECL
1260 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1262 TREE_ASM_WRITTEN (olddecl) = 0;
1266 DECL_ATTRIBUTES (newdecl)
1267 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1269 /* Merge the data types specified in the two decls. */
1270 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1272 if (different_binding_level)
1274 if (TYPE_ARG_TYPES (oldtype) != 0
1275 && TYPE_ARG_TYPES (newtype) == 0)
1276 TREE_TYPE (newdecl) = common_type (newtype, oldtype);
1279 = build_type_attribute_variant
1281 merge_attributes (TYPE_ATTRIBUTES (newtype),
1282 TYPE_ATTRIBUTES (oldtype)));
1286 = TREE_TYPE (olddecl)
1287 = common_type (newtype, oldtype);
1290 /* Lay the type out, unless already done. */
1291 if (oldtype != TREE_TYPE (newdecl))
1293 if (TREE_TYPE (newdecl) != error_mark_node)
1294 layout_type (TREE_TYPE (newdecl));
1295 if (TREE_CODE (newdecl) != FUNCTION_DECL
1296 && TREE_CODE (newdecl) != TYPE_DECL
1297 && TREE_CODE (newdecl) != CONST_DECL)
1298 layout_decl (newdecl, 0);
1302 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1303 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1304 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1305 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1306 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1307 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1309 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1310 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1314 /* Keep the old rtl since we can safely use it. */
1315 COPY_DECL_RTL (olddecl, newdecl);
1317 /* Merge the type qualifiers. */
1318 if (TREE_READONLY (newdecl))
1319 TREE_READONLY (write_olddecl) = 1;
1321 if (TREE_THIS_VOLATILE (newdecl))
1323 TREE_THIS_VOLATILE (write_olddecl) = 1;
1324 if (TREE_CODE (newdecl) == VAR_DECL)
1325 make_var_volatile (newdecl);
1328 /* Keep source location of definition rather than declaration. */
1329 /* When called with different_binding_level set, keep the old
1330 information so that meaningful diagnostics can be given. */
1331 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1332 && ! different_binding_level)
1333 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1335 /* Merge the unused-warning information. */
1336 if (DECL_IN_SYSTEM_HEADER (olddecl))
1337 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1338 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1339 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1341 /* Merge the initialization information. */
1342 /* When called with different_binding_level set, don't copy over
1343 DECL_INITIAL, so that we don't accidentally change function
1344 declarations into function definitions. */
1345 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1346 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1348 /* Merge the section attribute.
1349 We want to issue an error if the sections conflict but that must be
1350 done later in decl_attributes since we are called before attributes
1352 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1353 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1355 /* Copy the assembler name.
1356 Currently, it can only be defined in the prototype. */
1357 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1359 /* If either declaration has a nondefault visibility, use it. */
1360 if (DECL_VISIBILITY (olddecl) != VISIBILITY_DEFAULT)
1361 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1363 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1365 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1366 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1367 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1368 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1369 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1370 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1371 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1372 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1373 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1376 /* Merge the storage class information. */
1377 merge_weak (newdecl, olddecl);
1379 /* For functions, static overrides non-static. */
1380 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1382 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1383 /* This is since we don't automatically
1384 copy the attributes of NEWDECL into OLDDECL. */
1385 /* No need to worry about different_binding_level here because
1386 then TREE_PUBLIC (newdecl) was true. */
1387 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1388 /* If this clears `static', clear it in the identifier too. */
1389 if (! TREE_PUBLIC (olddecl))
1390 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1392 if (DECL_EXTERNAL (newdecl))
1394 if (! different_binding_level || different_tu)
1396 /* Don't mess with these flags on local externs; they remain
1397 external even if there's a declaration at file scope which
1399 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1400 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1402 /* An extern decl does not override previous storage class. */
1403 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1404 if (! DECL_EXTERNAL (newdecl))
1406 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1407 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1408 /* If we have two non-EXTERNAL file-scope decls that are
1409 the same, only one of them should be written out. */
1411 TREE_ASM_WRITTEN (newdecl) = 1;
1416 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1417 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1420 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1422 /* If we're redefining a function previously defined as extern
1423 inline, make sure we emit debug info for the inline before we
1424 throw it away, in case it was inlined into a function that hasn't
1425 been written out yet. */
1426 if (new_is_definition && DECL_INITIAL (olddecl))
1428 if (TREE_USED (olddecl)
1429 /* In unit-at-a-time mode we never inline re-defined extern
1430 inline functions. */
1431 && !flag_unit_at_a_time
1432 && cgraph_function_possibly_inlined_p (olddecl))
1433 (*debug_hooks->outlining_inline_function) (olddecl);
1435 /* The new defn must not be inline. */
1436 DECL_INLINE (newdecl) = 0;
1437 DECL_UNINLINABLE (newdecl) = 1;
1441 /* If either decl says `inline', this fn is inline,
1442 unless its definition was passed already. */
1443 if (DECL_DECLARED_INLINE_P (newdecl)
1444 || DECL_DECLARED_INLINE_P (olddecl))
1445 DECL_DECLARED_INLINE_P (newdecl) = 1;
1447 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1448 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1451 if (DECL_BUILT_IN (olddecl))
1453 /* Get rid of any built-in function if we have a function
1455 if (new_is_definition)
1457 if (! different_binding_level)
1459 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1460 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
1465 /* If redeclaring a builtin function, and not a definition,
1466 it stays built in. */
1467 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1468 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1472 /* Also preserve various other info from the definition. */
1473 if (! new_is_definition)
1475 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1476 /* When called with different_binding_level set, don't copy over
1477 DECL_INITIAL, so that we don't accidentally change function
1478 declarations into function definitions. */
1479 if (! different_binding_level)
1480 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1481 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1482 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1483 DECL_ESTIMATED_INSNS (newdecl) = DECL_ESTIMATED_INSNS (olddecl);
1484 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1486 /* Set DECL_INLINE on the declaration if we've got a body
1487 from which to instantiate. */
1488 if (DECL_INLINE (olddecl) && ! DECL_UNINLINABLE (newdecl))
1490 DECL_INLINE (newdecl) = 1;
1491 DECL_ABSTRACT_ORIGIN (newdecl)
1492 = (different_binding_level
1493 ? DECL_ORIGIN (olddecl)
1494 : DECL_ABSTRACT_ORIGIN (olddecl));
1499 /* If a previous declaration said inline, mark the
1500 definition as inlinable. */
1501 if (DECL_DECLARED_INLINE_P (newdecl)
1502 && ! DECL_UNINLINABLE (newdecl))
1503 DECL_INLINE (newdecl) = 1;
1506 if (different_binding_level)
1509 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1510 But preserve OLDDECL's DECL_UID. */
1512 unsigned olddecl_uid = DECL_UID (olddecl);
1514 memcpy ((char *) olddecl + sizeof (struct tree_common),
1515 (char *) newdecl + sizeof (struct tree_common),
1516 sizeof (struct tree_decl) - sizeof (struct tree_common));
1517 DECL_UID (olddecl) = olddecl_uid;
1520 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1521 so that encode_section_info has a chance to look at the new decl
1522 flags and attributes. */
1523 if (DECL_RTL_SET_P (olddecl)
1524 && (TREE_CODE (olddecl) == FUNCTION_DECL
1525 || (TREE_CODE (olddecl) == VAR_DECL
1526 && TREE_STATIC (olddecl))))
1527 make_decl_rtl (olddecl, NULL);
1530 /* Handle when a new declaration NEWDECL has the same name as an old
1531 one OLDDECL in the same binding contour. Prints an error message
1534 If safely possible, alter OLDDECL to look like NEWDECL, and return
1535 true. Otherwise, return false.
1537 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external
1538 declaration, and OLDDECL is in an outer scope and should thus not
1542 duplicate_decls (tree newdecl, tree olddecl,
1543 bool different_binding_level, bool different_tu)
1545 tree newtype, oldtype;
1547 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
1550 merge_decls (newdecl, olddecl, newtype, oldtype,
1551 different_binding_level, different_tu);
1552 return !different_binding_level;
1556 /* Return any external DECL associated with ID, whether or not it is
1557 currently in scope. */
1560 any_external_decl (tree id)
1562 tree decl = IDENTIFIER_SYMBOL_VALUE (id);
1565 if (decl == 0 || TREE_CODE (decl) == ERROR_MARK)
1567 else if (TREE_CODE (decl) != TYPE_DECL && DECL_EXTERNAL (decl))
1570 t = purpose_member (id, truly_local_externals);
1572 return TREE_VALUE (t);
1577 /* Record an external decl DECL. This only does something if a
1578 shadowing decl already exists. */
1580 record_external_decl (tree decl)
1582 tree name = DECL_NAME (decl);
1583 if (!IDENTIFIER_SYMBOL_VALUE (name))
1586 truly_local_externals = tree_cons (name, decl, truly_local_externals);
1589 /* Check whether decl-node X shadows an existing declaration.
1590 OLD is the old IDENTIFIER_SYMBOL_VALUE of the DECL_NAME of X,
1591 which might be a NULL_TREE. */
1593 warn_if_shadowing (tree x, tree old)
1597 /* Nothing to shadow? */
1599 /* Shadow warnings not wanted? */
1601 /* No shadow warnings for internally generated vars. */
1602 || DECL_SOURCE_LINE (x) == 0
1603 /* No shadow warnings for vars made for inlining. */
1604 || DECL_FROM_INLINE (x)
1605 /* Don't warn about the parm names in function declarator
1606 within a function declarator.
1607 It would be nice to avoid warning in any function
1608 declarator in a declaration, as opposed to a definition,
1609 but there is no way to tell it's not a definition. */
1610 || (TREE_CODE (x) == PARM_DECL && current_scope->outer->parm_flag))
1613 name = IDENTIFIER_POINTER (DECL_NAME (x));
1614 if (TREE_CODE (old) == PARM_DECL)
1615 shadow_warning (SW_PARAM, name, old);
1616 else if (DECL_FILE_SCOPE_P (old))
1617 shadow_warning (SW_GLOBAL, name, old);
1619 shadow_warning (SW_LOCAL, name, old);
1623 /* Subroutine of pushdecl.
1625 X is a TYPE_DECL for a typedef statement. Create a brand new
1626 ..._TYPE node (which will be just a variant of the existing
1627 ..._TYPE node with identical properties) and then install X
1628 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1630 The whole point here is to end up with a situation where each
1631 and every ..._TYPE node the compiler creates will be uniquely
1632 associated with AT MOST one node representing a typedef name.
1633 This way, even though the compiler substitutes corresponding
1634 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1635 early on, later parts of the compiler can always do the reverse
1636 translation and get back the corresponding typedef name. For
1639 typedef struct S MY_TYPE;
1642 Later parts of the compiler might only know that `object' was of
1643 type `struct S' if it were not for code just below. With this
1644 code however, later parts of the compiler see something like:
1646 struct S' == struct S
1647 typedef struct S' MY_TYPE;
1650 And they can then deduce (from the node for type struct S') that
1651 the original object declaration was:
1655 Being able to do this is important for proper support of protoize,
1656 and also for generating precise symbolic debugging information
1657 which takes full account of the programmer's (typedef) vocabulary.
1659 Obviously, we don't want to generate a duplicate ..._TYPE node if
1660 the TYPE_DECL node that we are now processing really represents a
1661 standard built-in type.
1663 Since all standard types are effectively declared at line zero
1664 in the source file, we can easily check to see if we are working
1665 on a standard type by checking the current value of lineno. */
1668 clone_underlying_type (tree x)
1670 if (DECL_SOURCE_LINE (x) == 0)
1672 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1673 TYPE_NAME (TREE_TYPE (x)) = x;
1675 else if (TREE_TYPE (x) != error_mark_node
1676 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
1678 tree tt = TREE_TYPE (x);
1679 DECL_ORIGINAL_TYPE (x) = tt;
1680 tt = build_type_copy (tt);
1682 TREE_USED (tt) = TREE_USED (x);
1687 /* Record a decl-node X as belonging to the current lexical scope.
1688 Check for errors (such as an incompatible declaration for the same
1689 name already seen in the same scope).
1691 Returns either X or an old decl for the same name.
1692 If an old decl is returned, it may have been smashed
1693 to agree with what X says. */
1698 tree name = DECL_NAME (x);
1699 struct c_scope *scope = current_scope;
1701 #ifdef ENABLE_CHECKING
1702 if (error_mark_node == 0)
1703 /* Called too early. */
1707 /* Functions need the lang_decl data. */
1708 if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
1709 DECL_LANG_SPECIFIC (x) = ggc_alloc_cleared (sizeof (struct lang_decl));
1711 /* A local extern declaration for a function doesn't constitute nesting.
1712 A local auto declaration does, since it's a forward decl
1713 for a nested function coming later. */
1714 if (current_function_decl == NULL
1715 || ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
1716 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x)))
1717 DECL_CONTEXT (x) = current_file_decl;
1719 DECL_CONTEXT (x) = current_function_decl;
1725 if (warn_nested_externs
1726 && scope != global_scope
1727 && DECL_EXTERNAL (x)
1728 && !DECL_IN_SYSTEM_HEADER (x))
1729 warning ("nested extern declaration of `%s'",
1730 IDENTIFIER_POINTER (name));
1732 old = lookup_name_current_level (name);
1733 if (old && duplicate_decls (x, old, 0, false))
1735 /* For PARM_DECLs, old may be a forward declaration.
1736 If so, we want to remove it from its old location
1737 (in the variables chain) and rechain it in the
1738 location given by the new declaration. */
1739 if (TREE_CODE (x) == PARM_DECL)
1742 for (p = &scope->names; *p; p = &TREE_CHAIN (*p))
1745 *p = TREE_CHAIN (old);
1746 SCOPE_LIST_APPEND (scope, parms, old);
1752 if (DECL_EXTERNAL (x) || scope == global_scope)
1754 /* Find and check against a previous, not-in-scope, external
1755 decl for this identifier. (C99 6.2.7p2: All declarations
1756 that refer to the same object or function shall have
1757 compatible type; otherwise, the behavior is undefined.) */
1758 tree ext = any_external_decl (name);
1761 if (duplicate_decls (x, ext, scope != global_scope,
1763 x = copy_node (ext);
1766 record_external_decl (x);
1769 if (TREE_CODE (x) == TYPE_DECL)
1770 clone_underlying_type (x);
1772 /* If storing a local value, there may already be one
1773 (inherited). If so, record it for restoration when this
1774 scope ends. Take care not to do this if we are replacing an
1775 older decl in the same scope (i.e. duplicate_decls returned
1777 if (scope != global_scope
1778 && IDENTIFIER_SYMBOL_VALUE (name)
1779 && IDENTIFIER_SYMBOL_VALUE (name) != old)
1781 warn_if_shadowing (x, IDENTIFIER_SYMBOL_VALUE (name));
1782 scope->shadowed = tree_cons (name, IDENTIFIER_SYMBOL_VALUE (name),
1786 /* Install the new declaration in the requested scope. */
1787 IDENTIFIER_SYMBOL_VALUE (name) = x;
1788 C_DECL_INVISIBLE (x) = 0;
1790 /* If x's type is incomplete because it's based on a
1791 structure or union which has not yet been fully declared,
1792 attach it to that structure or union type, so we can go
1793 back and complete the variable declaration later, if the
1794 structure or union gets fully declared.
1796 If the input is erroneous, we can have error_mark in the type
1797 slot (e.g. "f(void a, ...)") - that doesn't count as an
1799 if (TREE_TYPE (x) != error_mark_node
1800 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
1802 tree element = TREE_TYPE (x);
1804 while (TREE_CODE (element) == ARRAY_TYPE)
1805 element = TREE_TYPE (element);
1806 element = TYPE_MAIN_VARIANT (element);
1808 if ((TREE_CODE (element) == RECORD_TYPE
1809 || TREE_CODE (element) == UNION_TYPE)
1810 && (TREE_CODE (x) != TYPE_DECL
1811 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
1812 && !COMPLETE_TYPE_P (element))
1813 C_TYPE_INCOMPLETE_VARS (element)
1814 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
1818 if (TREE_CODE (x) == PARM_DECL)
1819 SCOPE_LIST_APPEND (scope, parms, x);
1821 SCOPE_LIST_APPEND (scope, names, x);
1826 /* Record X as belonging to the global scope (C99 "file scope").
1827 This is used only internally by the Objective-C front end,
1828 and is limited to its needs. duplicate_decls is not called;
1829 if there is any preexisting decl for this identifier, it is an ICE. */
1832 pushdecl_top_level (tree x)
1836 if (TREE_CODE (x) != VAR_DECL)
1839 name = DECL_NAME (x);
1841 if (IDENTIFIER_SYMBOL_VALUE (name))
1844 DECL_CONTEXT (x) = current_file_decl;
1845 IDENTIFIER_SYMBOL_VALUE (name) = x;
1847 SCOPE_LIST_APPEND (global_scope, names, x);
1851 /* Generate an implicit declaration for identifier FUNCTIONID as a
1852 function of type int (). */
1855 implicitly_declare (tree functionid)
1857 tree decl = any_external_decl (functionid);
1861 /* Implicit declaration of a function already declared
1862 (somehow) in a different scope, or as a built-in.
1863 If this is the first time this has happened, warn;
1864 then recycle the old declaration. */
1865 if (!C_DECL_IMPLICIT (decl))
1867 implicit_decl_warning (DECL_NAME (decl));
1868 if (! DECL_FILE_SCOPE_P (decl))
1869 warning ("%Jprevious declaration of '%D'", decl, decl);
1870 C_DECL_IMPLICIT (decl) = 1;
1872 /* If this function is global, then it must already be in the
1873 global scope, so there's no need to push it again. */
1874 if (current_scope == global_scope)
1876 /* If this is a local declaration, make a copy; we can't have
1877 the same DECL listed in two different scopes. */
1878 return pushdecl (copy_node (decl));
1881 /* Not seen before. */
1882 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
1883 DECL_EXTERNAL (decl) = 1;
1884 TREE_PUBLIC (decl) = 1;
1885 C_DECL_IMPLICIT (decl) = 1;
1886 implicit_decl_warning (functionid);
1888 /* C89 says implicit declarations are in the innermost block.
1889 So we record the decl in the standard fashion. */
1890 decl = pushdecl (decl);
1892 /* No need to call objc_check_decl here - it's a function type. */
1893 rest_of_decl_compilation (decl, NULL, 0, 0);
1895 /* Write a record describing this implicit function declaration
1896 to the prototypes file (if requested). */
1897 gen_aux_info_record (decl, 0, 1, 0);
1899 /* Possibly apply some default attributes to this implicit declaration. */
1900 decl_attributes (&decl, NULL_TREE, 0);
1906 implicit_decl_warning (tree id)
1908 const char *name = IDENTIFIER_POINTER (id);
1909 if (mesg_implicit_function_declaration == 2)
1910 error ("implicit declaration of function `%s'", name);
1911 else if (mesg_implicit_function_declaration == 1)
1912 warning ("implicit declaration of function `%s'", name);
1915 /* Issue an error message for a reference to an undeclared variable
1916 ID, including a reference to a builtin outside of function-call
1917 context. Establish a binding of the identifier to error_mark_node
1918 in an appropriate scope, which will suppress further errors for the
1921 undeclared_variable (tree id)
1923 static bool already = false;
1924 struct c_scope *scope;
1926 if (current_function_decl == 0)
1928 error ("`%s' undeclared here (not in a function)",
1929 IDENTIFIER_POINTER (id));
1930 scope = current_scope;
1934 error ("`%s' undeclared (first use in this function)",
1935 IDENTIFIER_POINTER (id));
1939 error ("(Each undeclared identifier is reported only once");
1940 error ("for each function it appears in.)");
1944 scope = current_function_scope;
1947 scope->shadowed = tree_cons (id, IDENTIFIER_SYMBOL_VALUE (id),
1949 IDENTIFIER_SYMBOL_VALUE (id) = error_mark_node;
1952 /* Subroutine of lookup_label, declare_label, define_label: construct a
1953 LABEL_DECL with all the proper frills. */
1956 make_label (tree name, location_t location)
1958 tree label = build_decl (LABEL_DECL, name, void_type_node);
1960 DECL_CONTEXT (label) = current_function_decl;
1961 DECL_MODE (label) = VOIDmode;
1962 DECL_SOURCE_LOCATION (label) = location;
1967 /* Another subroutine of lookup_label, declare_label, define_label:
1968 set up the binding of name to LABEL_DECL in the given SCOPE. */
1971 bind_label (tree name, tree label, struct c_scope *scope)
1973 if (IDENTIFIER_LABEL_VALUE (name))
1974 scope->shadowed = tree_cons (name, IDENTIFIER_LABEL_VALUE (name),
1976 IDENTIFIER_LABEL_VALUE (name) = label;
1978 SCOPE_LIST_APPEND (scope, names, label);
1981 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
1982 Create one if none exists so far for the current function.
1983 This is called when a label is used in a goto expression or
1984 has its address taken. */
1987 lookup_label (tree name)
1991 if (current_function_decl == 0)
1993 error ("label %s referenced outside of any function",
1994 IDENTIFIER_POINTER (name));
1998 /* Use a label already defined or ref'd with this name, but not if
1999 it is inherited from a containing function and wasn't declared
2001 label = IDENTIFIER_LABEL_VALUE (name);
2002 if (label && (DECL_CONTEXT (label) == current_function_decl
2003 || C_DECLARED_LABEL_FLAG (label)))
2005 /* If the label has only been declared, update its apparent
2006 location to point here, for better diagnostics if it
2007 turns out not to have been defined. */
2008 if (!TREE_USED (label))
2009 DECL_SOURCE_LOCATION (label) = input_location;
2013 /* No label binding for that identifier; make one. */
2014 label = make_label (name, input_location);
2016 /* Ordinary labels go in the current function scope. */
2017 bind_label (name, label, current_function_scope);
2021 /* Make a label named NAME in the current function, shadowing silently
2022 any that may be inherited from containing functions or containing
2023 scopes. This is called for __label__ declarations. */
2025 /* Note that valid use, if the label being shadowed comes from another
2026 scope in the same function, requires calling declare_nonlocal_label
2027 right away. (Is this still true? -zw 2003-07-17) */
2030 declare_label (tree name)
2032 tree label = IDENTIFIER_LABEL_VALUE (name);
2035 /* Check to make sure that the label hasn't already been declared
2037 for (dup = current_scope->names; dup; dup = TREE_CHAIN (dup))
2040 error ("duplicate label declaration `%s'", IDENTIFIER_POINTER (name));
2041 error ("%Jthis is a previous declaration", dup);
2043 /* Just use the previous declaration. */
2047 label = make_label (name, input_location);
2048 C_DECLARED_LABEL_FLAG (label) = 1;
2050 /* Declared labels go in the current scope. */
2051 bind_label (name, label, current_scope);
2055 /* Define a label, specifying the location in the source file.
2056 Return the LABEL_DECL node for the label, if the definition is valid.
2057 Otherwise return 0. */
2060 define_label (location_t location, tree name)
2064 /* Find any preexisting label with this name. It is an error
2065 if that label has already been defined in this function, or
2066 if there is a containing function with a declared label with
2068 label = IDENTIFIER_LABEL_VALUE (name);
2071 && ((DECL_CONTEXT (label) == current_function_decl
2072 && DECL_INITIAL (label) != 0)
2073 || (DECL_CONTEXT (label) != current_function_decl
2074 && C_DECLARED_LABEL_FLAG (label))))
2076 error ("%Hduplicate label `%D'", &location, label);
2077 if (DECL_INITIAL (label))
2078 error ("%J`%D' previously defined here", label, label);
2080 error ("%J`%D' previously declared here", label, label);
2083 else if (label && DECL_CONTEXT (label) == current_function_decl)
2085 /* The label has been used or declared already in this function,
2086 but not defined. Update its location to point to this
2088 DECL_SOURCE_LOCATION (label) = location;
2092 /* No label binding for that identifier; make one. */
2093 label = make_label (name, location);
2095 /* Ordinary labels go in the current function scope. */
2096 bind_label (name, label, current_function_scope);
2099 if (warn_traditional && !in_system_header && lookup_name (name))
2100 warning ("%Htraditional C lacks a separate namespace for labels, "
2101 "identifier `%s' conflicts", &location,
2102 IDENTIFIER_POINTER (name));
2104 /* Mark label as having been defined. */
2105 DECL_INITIAL (label) = error_mark_node;
2109 /* Return the list of declarations of the current scope. */
2114 return current_scope->names;
2118 /* Given NAME, an IDENTIFIER_NODE,
2119 return the structure (or union or enum) definition for that name.
2120 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2121 CODE says which kind of type the caller wants;
2122 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2123 If the wrong kind of type is found, an error is reported. */
2126 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2128 tree tag = IDENTIFIER_TAG_VALUE (name);
2134 /* We only care about whether it's in this level if
2135 thislevel_only was set or it might be a type clash. */
2136 if (thislevel_only || TREE_CODE (tag) != code)
2138 if (current_scope == global_scope
2139 || purpose_member (name, current_scope->tags))
2143 if (thislevel_only && !thislevel)
2146 if (TREE_CODE (tag) != code)
2148 /* Definition isn't the kind we were looking for. */
2149 pending_invalid_xref = name;
2150 pending_invalid_xref_location = input_location;
2152 /* If in the same binding level as a declaration as a tag
2153 of a different type, this must not be allowed to
2154 shadow that tag, so give the error immediately.
2155 (For example, "struct foo; union foo;" is invalid.) */
2157 pending_xref_error ();
2162 /* Print an error message now
2163 for a recent invalid struct, union or enum cross reference.
2164 We don't print them immediately because they are not invalid
2165 when used in the `struct foo;' construct for shadowing. */
2168 pending_xref_error (void)
2170 if (pending_invalid_xref != 0)
2171 error ("%H`%s' defined as wrong kind of tag",
2172 &pending_invalid_xref_location,
2173 IDENTIFIER_POINTER (pending_invalid_xref));
2174 pending_invalid_xref = 0;
2178 /* Look up NAME in the current scope and its superiors
2179 in the namespace of variables, functions and typedefs.
2180 Return a ..._DECL node of some kind representing its definition,
2181 or return 0 if it is undefined. */
2184 lookup_name (tree name)
2186 tree decl = IDENTIFIER_SYMBOL_VALUE (name);
2187 if (decl == 0 || decl == error_mark_node)
2189 if (C_DECL_INVISIBLE (decl))
2194 /* Similar to `lookup_name' but look only at the current scope. */
2197 lookup_name_current_level (tree name)
2199 tree decl = IDENTIFIER_SYMBOL_VALUE (name);
2201 if (decl == 0 || decl == error_mark_node || C_DECL_INVISIBLE (decl))
2204 if (current_scope == global_scope)
2207 /* Scan the current scope for a decl with name NAME.
2208 For PARM_DECLs, we have to look at both ->parms and ->names, since
2209 forward parameter declarations wind up on the ->names list. */
2210 if (TREE_CODE (decl) == PARM_DECL
2211 && chain_member (decl, current_scope->parms))
2213 if (chain_member (decl, current_scope->names))
2219 /* Create the predefined scalar types of C,
2220 and some nodes representing standard constants (0, 1, (void *) 0).
2221 Initialize the global scope.
2222 Make definitions for built-in primitive functions. */
2225 c_init_decl_processing (void)
2228 tree ptr_ftype_void, ptr_ftype_ptr;
2229 location_t save_loc = input_location;
2231 /* Adds some ggc roots, and reserved words for c-parse.in. */
2234 current_function_decl = 0;
2236 /* Make the c_scope structure for global names. */
2238 global_scope = current_scope;
2240 /* Declarations from c_common_nodes_and_builtins must not be associated
2241 with this input file, lest we get differences between using and not
2242 using preprocessed headers. */
2243 input_location.file = "<internal>";
2244 input_location.line = 0;
2246 /* Make the DECL for the toplevel file scope. */
2247 current_file_decl = build_decl (TRANSLATION_UNIT_DECL, NULL, NULL);
2249 build_common_tree_nodes (flag_signed_char);
2251 c_common_nodes_and_builtins ();
2253 /* In C, comparisons and TRUTH_* expressions have type int. */
2254 truthvalue_type_node = integer_type_node;
2255 truthvalue_true_node = integer_one_node;
2256 truthvalue_false_node = integer_zero_node;
2258 /* Even in C99, which has a real boolean type. */
2259 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2260 boolean_type_node));
2262 endlink = void_list_node;
2263 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
2265 = build_function_type (ptr_type_node,
2266 tree_cons (NULL_TREE, ptr_type_node, endlink));
2268 input_location = save_loc;
2270 pedantic_lvalues = pedantic;
2272 make_fname_decl = c_make_fname_decl;
2273 start_fname_decls ();
2275 first_builtin_decl = global_scope->names;
2276 last_builtin_decl = global_scope->names_last;
2279 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2280 decl, NAME is the initialization string and TYPE_DEP indicates whether
2281 NAME depended on the type of the function. As we don't yet implement
2282 delayed emission of static data, we mark the decl as emitted
2283 so it is not placed in the output. Anything using it must therefore pull
2284 out the STRING_CST initializer directly. FIXME. */
2287 c_make_fname_decl (tree id, int type_dep)
2289 const char *name = fname_as_string (type_dep);
2290 tree decl, type, init;
2291 size_t length = strlen (name);
2293 type = build_array_type
2294 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
2295 build_index_type (size_int (length)));
2297 decl = build_decl (VAR_DECL, id, type);
2299 TREE_STATIC (decl) = 1;
2300 TREE_READONLY (decl) = 1;
2301 DECL_ARTIFICIAL (decl) = 1;
2303 init = build_string (length + 1, name);
2304 TREE_TYPE (init) = type;
2305 DECL_INITIAL (decl) = init;
2307 TREE_USED (decl) = 1;
2309 if (current_function_decl)
2311 DECL_CONTEXT (decl) = current_function_decl;
2312 IDENTIFIER_SYMBOL_VALUE (id) = decl;
2313 SCOPE_LIST_APPEND (current_function_scope, names, decl);
2316 finish_decl (decl, init, NULL_TREE);
2321 /* Return a definition for a builtin function named NAME and whose data type
2322 is TYPE. TYPE should be a function type with argument types.
2323 FUNCTION_CODE tells later passes how to compile calls to this function.
2324 See tree.h for its possible values.
2326 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2327 the name to be called if we can't opencode the function. If
2328 ATTRS is nonzero, use that for the function's attribute list. */
2331 builtin_function (const char *name, tree type, int function_code,
2332 enum built_in_class class, const char *library_name,
2335 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
2336 DECL_EXTERNAL (decl) = 1;
2337 TREE_PUBLIC (decl) = 1;
2339 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2340 make_decl_rtl (decl, NULL);
2342 DECL_BUILT_IN_CLASS (decl) = class;
2343 DECL_FUNCTION_CODE (decl) = function_code;
2345 /* Warn if a function in the namespace for users
2346 is used without an occasion to consider it declared. */
2347 if (name[0] != '_' || name[1] != '_')
2348 C_DECL_INVISIBLE (decl) = 1;
2350 /* Possibly apply some default attributes to this built-in function. */
2352 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2354 decl_attributes (&decl, NULL_TREE, 0);
2359 /* Called when a declaration is seen that contains no names to declare.
2360 If its type is a reference to a structure, union or enum inherited
2361 from a containing scope, shadow that tag name for the current scope
2362 with a forward reference.
2363 If its type defines a new named structure or union
2364 or defines an enum, it is valid but we need not do anything here.
2365 Otherwise, it is an error. */
2368 shadow_tag (tree declspecs)
2370 shadow_tag_warned (declspecs, 0);
2374 shadow_tag_warned (tree declspecs, int warned)
2377 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
2384 pending_invalid_xref = 0;
2386 /* Remove the attributes from declspecs, since they will confuse the
2388 split_specs_attrs (declspecs, &specs, &attrs);
2390 for (link = specs; link; link = TREE_CHAIN (link))
2392 tree value = TREE_VALUE (link);
2393 enum tree_code code = TREE_CODE (value);
2395 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2396 /* Used to test also that TYPE_SIZE (value) != 0.
2397 That caused warning for `struct foo;' at top level in the file. */
2399 tree name = TYPE_NAME (value);
2406 if (warned != 1 && code != ENUMERAL_TYPE)
2407 /* Empty unnamed enum OK */
2409 pedwarn ("unnamed struct/union that defines no instances");
2415 t = lookup_tag (code, name, 1);
2419 t = make_node (code);
2426 if (!warned && ! in_system_header)
2428 warning ("useless keyword or type name in empty declaration");
2435 error ("two types specified in one empty declaration");
2440 pedwarn ("empty declaration");
2444 /* Construct an array declarator. EXPR is the expression inside [], or
2445 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2446 to the pointer to which a parameter array is converted). STATIC_P is
2447 nonzero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
2448 is nonzero is the array is [*], a VLA of unspecified length which is
2449 nevertheless a complete type (not currently implemented by GCC),
2450 zero otherwise. The declarator is constructed as an ARRAY_REF
2451 (to be decoded by grokdeclarator), whose operand 0 is what's on the
2452 left of the [] (filled by in set_array_declarator_type) and operand 1
2453 is the expression inside; whose TREE_TYPE is the type qualifiers and
2454 which has TREE_STATIC set if "static" is used. */
2457 build_array_declarator (tree expr, tree quals, int static_p, int vla_unspec_p)
2460 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
2461 TREE_TYPE (decl) = quals;
2462 TREE_STATIC (decl) = (static_p ? 1 : 0);
2463 if (pedantic && !flag_isoc99)
2465 if (static_p || quals != NULL_TREE)
2466 pedwarn ("ISO C90 does not support `static' or type qualifiers in parameter array declarators");
2468 pedwarn ("ISO C90 does not support `[*]' array declarators");
2471 warning ("GCC does not yet properly implement `[*]' array declarators");
2475 /* Set the type of an array declarator. DECL is the declarator, as
2476 constructed by build_array_declarator; TYPE is what appears on the left
2477 of the [] and goes in operand 0. ABSTRACT_P is nonzero if it is an
2478 abstract declarator, zero otherwise; this is used to reject static and
2479 type qualifiers in abstract declarators, where they are not in the
2483 set_array_declarator_type (tree decl, tree type, int abstract_p)
2485 TREE_OPERAND (decl, 0) = type;
2486 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
2487 error ("static or type qualifiers in abstract declarator");
2491 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2494 groktypename (tree typename)
2498 if (TREE_CODE (typename) != TREE_LIST)
2501 split_specs_attrs (TREE_PURPOSE (typename), &specs, &attrs);
2503 typename = grokdeclarator (TREE_VALUE (typename), specs, TYPENAME, 0,
2506 /* Apply attributes. */
2507 decl_attributes (&typename, attrs, 0);
2512 /* Return a PARM_DECL node for a given pair of specs and declarator. */
2515 groktypename_in_parm_context (tree typename)
2517 if (TREE_CODE (typename) != TREE_LIST)
2519 return grokdeclarator (TREE_VALUE (typename),
2520 TREE_PURPOSE (typename),
2524 /* Decode a declarator in an ordinary declaration or data definition.
2525 This is called as soon as the type information and variable name
2526 have been parsed, before parsing the initializer if any.
2527 Here we create the ..._DECL node, fill in its type,
2528 and put it on the list of decls for the current context.
2529 The ..._DECL node is returned as the value.
2531 Exception: for arrays where the length is not specified,
2532 the type is left null, to be filled in by `finish_decl'.
2534 Function definitions do not come here; they go to start_function
2535 instead. However, external and forward declarations of functions
2536 do go through here. Structure field declarations are done by
2537 grokfield and not through here. */
2540 start_decl (tree declarator, tree declspecs, int initialized, tree attributes)
2545 /* An object declared as __attribute__((deprecated)) suppresses
2546 warnings of uses of other deprecated items. */
2547 if (lookup_attribute ("deprecated", attributes))
2548 deprecated_state = DEPRECATED_SUPPRESS;
2550 decl = grokdeclarator (declarator, declspecs,
2551 NORMAL, initialized, NULL);
2553 deprecated_state = DEPRECATED_NORMAL;
2555 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
2556 && MAIN_NAME_P (DECL_NAME (decl)))
2557 warning ("%J'%D' is usually a function", decl, decl);
2560 /* Is it valid for this decl to have an initializer at all?
2561 If not, set INITIALIZED to zero, which will indirectly
2562 tell `finish_decl' to ignore the initializer once it is parsed. */
2563 switch (TREE_CODE (decl))
2566 error ("typedef `%s' is initialized (use __typeof__ instead)",
2567 IDENTIFIER_POINTER (DECL_NAME (decl)));
2572 error ("function `%s' is initialized like a variable",
2573 IDENTIFIER_POINTER (DECL_NAME (decl)));
2578 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
2579 error ("parameter `%s' is initialized",
2580 IDENTIFIER_POINTER (DECL_NAME (decl)));
2585 /* Don't allow initializations for incomplete types
2586 except for arrays which might be completed by the initialization. */
2588 /* This can happen if the array size is an undefined macro. We already
2589 gave a warning, so we don't need another one. */
2590 if (TREE_TYPE (decl) == error_mark_node)
2592 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
2594 /* A complete type is ok if size is fixed. */
2596 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
2597 || C_DECL_VARIABLE_SIZE (decl))
2599 error ("variable-sized object may not be initialized");
2603 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
2605 error ("variable `%s' has initializer but incomplete type",
2606 IDENTIFIER_POINTER (DECL_NAME (decl)));
2609 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
2611 error ("elements of array `%s' have incomplete type",
2612 IDENTIFIER_POINTER (DECL_NAME (decl)));
2619 DECL_EXTERNAL (decl) = 0;
2620 if (current_scope == global_scope)
2621 TREE_STATIC (decl) = 1;
2623 /* Tell `pushdecl' this is an initialized decl
2624 even though we don't yet have the initializer expression.
2625 Also tell `finish_decl' it may store the real initializer. */
2626 DECL_INITIAL (decl) = error_mark_node;
2629 /* If this is a function declaration, write a record describing it to the
2630 prototypes file (if requested). */
2632 if (TREE_CODE (decl) == FUNCTION_DECL)
2633 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
2635 /* ANSI specifies that a tentative definition which is not merged with
2636 a non-tentative definition behaves exactly like a definition with an
2637 initializer equal to zero. (Section 3.7.2)
2639 -fno-common gives strict ANSI behavior, though this tends to break
2640 a large body of code that grew up without this rule.
2642 Thread-local variables are never common, since there's no entrenched
2643 body of code to break, and it allows more efficient variable references
2644 in the presence of dynamic linking. */
2646 if (TREE_CODE (decl) == VAR_DECL
2648 && TREE_PUBLIC (decl)
2649 && !DECL_THREAD_LOCAL (decl)
2651 DECL_COMMON (decl) = 1;
2653 /* Set attributes here so if duplicate decl, will have proper attributes. */
2654 decl_attributes (&decl, attributes, 0);
2656 if (TREE_CODE (decl) == FUNCTION_DECL
2657 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
2659 tree ce = declarator;
2661 if (TREE_CODE (ce) == INDIRECT_REF)
2662 ce = TREE_OPERAND (declarator, 0);
2663 if (TREE_CODE (ce) == CALL_EXPR)
2665 tree args = TREE_PURPOSE (TREE_OPERAND (ce, 1));
2666 for (; args; args = TREE_CHAIN (args))
2668 tree type = TREE_TYPE (args);
2669 if (INTEGRAL_TYPE_P (type)
2670 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
2671 DECL_ARG_TYPE (args) = integer_type_node;
2676 if (TREE_CODE (decl) == FUNCTION_DECL
2677 && DECL_DECLARED_INLINE_P (decl)
2678 && DECL_UNINLINABLE (decl)
2679 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
2680 warning ("%Jinline function '%D' given attribute noinline", decl, decl);
2682 /* Add this decl to the current scope.
2683 TEM may equal DECL or it may be a previous decl of the same name. */
2684 tem = pushdecl (decl);
2686 /* For a local variable, define the RTL now. */
2687 if (current_scope != global_scope
2688 /* But not if this is a duplicate decl
2689 and we preserved the rtl from the previous one
2690 (which may or may not happen). */
2691 && !DECL_RTL_SET_P (tem)
2692 && DECL_FILE_SCOPE_P (tem))
2694 if (TREE_TYPE (tem) != error_mark_node
2695 && (COMPLETE_TYPE_P (TREE_TYPE (tem))
2696 || (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
2697 && DECL_INITIAL (tem) != 0)))
2704 /* Finish processing of a declaration;
2705 install its initial value.
2706 If the length of an array type is not known before,
2707 it must be determined now, from the initial value, or it is an error. */
2710 finish_decl (tree decl, tree init, tree asmspec_tree)
2712 tree type = TREE_TYPE (decl);
2713 int was_incomplete = (DECL_SIZE (decl) == 0);
2714 const char *asmspec = 0;
2716 /* If a name was specified, get the string. */
2717 if (current_scope == global_scope)
2718 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
2720 asmspec = TREE_STRING_POINTER (asmspec_tree);
2722 /* If `start_decl' didn't like having an initialization, ignore it now. */
2723 if (init != 0 && DECL_INITIAL (decl) == 0)
2726 /* Don't crash if parm is initialized. */
2727 if (TREE_CODE (decl) == PARM_DECL)
2731 store_init_value (decl, init);
2733 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
2734 || TREE_CODE (decl) == FUNCTION_DECL
2735 || TREE_CODE (decl) == FIELD_DECL))
2736 objc_check_decl (decl);
2738 /* Deduce size of array from initialization, if not already known. */
2739 if (TREE_CODE (type) == ARRAY_TYPE
2740 && TYPE_DOMAIN (type) == 0
2741 && TREE_CODE (decl) != TYPE_DECL)
2744 = (TREE_STATIC (decl)
2745 /* Even if pedantic, an external linkage array
2746 may have incomplete type at first. */
2747 ? pedantic && !TREE_PUBLIC (decl)
2748 : !DECL_EXTERNAL (decl));
2750 = complete_array_type (type, DECL_INITIAL (decl), do_default);
2752 /* Get the completed type made by complete_array_type. */
2753 type = TREE_TYPE (decl);
2756 error ("%Jinitializer fails to determine size of '%D'", decl, decl);
2758 else if (failure == 2)
2761 error ("%Jarray size missing in '%D'", decl, decl);
2762 /* If a `static' var's size isn't known,
2763 make it extern as well as static, so it does not get
2765 If it is not `static', then do not mark extern;
2766 finish_incomplete_decl will give it a default size
2767 and it will get allocated. */
2768 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
2769 DECL_EXTERNAL (decl) = 1;
2772 /* TYPE_MAX_VALUE is always one less than the number of elements
2773 in the array, because we start counting at zero. Therefore,
2774 warn only if the value is less than zero. */
2775 else if (pedantic && TYPE_DOMAIN (type) != 0
2776 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
2777 error ("%Jzero or negative size array '%D'", decl, decl);
2779 layout_decl (decl, 0);
2782 if (TREE_CODE (decl) == VAR_DECL)
2784 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
2785 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
2786 layout_decl (decl, 0);
2788 if (DECL_SIZE (decl) == 0
2789 /* Don't give an error if we already gave one earlier. */
2790 && TREE_TYPE (decl) != error_mark_node
2791 && (TREE_STATIC (decl)
2793 /* A static variable with an incomplete type
2794 is an error if it is initialized.
2795 Also if it is not file scope.
2796 Otherwise, let it through, but if it is not `extern'
2797 then it may cause an error message later. */
2798 (DECL_INITIAL (decl) != 0
2799 || !DECL_FILE_SCOPE_P (decl))
2801 /* An automatic variable with an incomplete type
2803 !DECL_EXTERNAL (decl)))
2805 error ("%Jstorage size of '%D' isn't known", decl, decl);
2806 TREE_TYPE (decl) = error_mark_node;
2809 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
2810 && DECL_SIZE (decl) != 0)
2812 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
2813 constant_expression_warning (DECL_SIZE (decl));
2815 error ("%Jstorage size of '%D' isn't constant", decl, decl);
2818 if (TREE_USED (type))
2819 TREE_USED (decl) = 1;
2822 /* If this is a function and an assembler name is specified, reset DECL_RTL
2823 so we can give it its new name. Also, update built_in_decls if it
2824 was a normal built-in. */
2825 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
2827 /* ASMSPEC is given, and not the name of a register. Mark the
2828 name with a star so assemble_name won't munge it. */
2829 char *starred = alloca (strlen (asmspec) + 2);
2831 strcpy (starred + 1, asmspec);
2833 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
2835 tree builtin = built_in_decls [DECL_FUNCTION_CODE (decl)];
2836 SET_DECL_RTL (builtin, NULL_RTX);
2837 SET_DECL_ASSEMBLER_NAME (builtin, get_identifier (starred));
2838 #ifdef TARGET_MEM_FUNCTIONS
2839 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMCPY)
2840 init_block_move_fn (starred);
2841 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMSET)
2842 init_block_clear_fn (starred);
2844 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_BCOPY)
2845 init_block_move_fn (starred);
2846 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_BZERO)
2847 init_block_clear_fn (starred);
2850 SET_DECL_RTL (decl, NULL_RTX);
2851 change_decl_assembler_name (decl, get_identifier (starred));
2854 /* If #pragma weak was used, mark the decl weak now. */
2855 if (current_scope == global_scope)
2856 maybe_apply_pragma_weak (decl);
2858 /* Output the assembler code and/or RTL code for variables and functions,
2859 unless the type is an undefined structure or union.
2860 If not, it will get done when the type is completed. */
2862 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
2864 /* This is a no-op in c-lang.c or something real in objc-act.c. */
2865 if (c_dialect_objc ())
2866 objc_check_decl (decl);
2868 if (DECL_FILE_SCOPE_P (decl))
2870 if (DECL_INITIAL (decl) == NULL_TREE
2871 || DECL_INITIAL (decl) == error_mark_node)
2872 /* Don't output anything
2873 when a tentative file-scope definition is seen.
2874 But at end of compilation, do output code for them. */
2875 DECL_DEFER_OUTPUT (decl) = 1;
2876 rest_of_decl_compilation (decl, asmspec, true, 0);
2880 /* This is a local variable. If there is an ASMSPEC, the
2881 user has requested that we handle it specially. */
2884 /* In conjunction with an ASMSPEC, the `register'
2885 keyword indicates that we should place the variable
2886 in a particular register. */
2887 if (DECL_REGISTER (decl))
2888 DECL_C_HARD_REGISTER (decl) = 1;
2890 /* If this is not a static variable, issue a warning.
2891 It doesn't make any sense to give an ASMSPEC for an
2892 ordinary, non-register local variable. Historically,
2893 GCC has accepted -- but ignored -- the ASMSPEC in
2895 if (TREE_CODE (decl) == VAR_DECL
2896 && !DECL_REGISTER (decl)
2897 && !TREE_STATIC (decl))
2898 warning ("%Jignoring asm-specifier for non-static local "
2899 "variable '%D'", decl, decl);
2901 change_decl_assembler_name (decl, get_identifier (asmspec));
2904 if (TREE_CODE (decl) != FUNCTION_DECL)
2905 add_decl_stmt (decl);
2908 if (!DECL_FILE_SCOPE_P (decl))
2910 /* Recompute the RTL of a local array now
2911 if it used to be an incomplete type. */
2913 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
2915 /* If we used it already as memory, it must stay in memory. */
2916 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
2917 /* If it's still incomplete now, no init will save it. */
2918 if (DECL_SIZE (decl) == 0)
2919 DECL_INITIAL (decl) = 0;
2924 /* If this was marked 'used', be sure it will be output. */
2925 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
2926 mark_referenced (DECL_ASSEMBLER_NAME (decl));
2928 if (TREE_CODE (decl) == TYPE_DECL)
2929 rest_of_decl_compilation (decl, NULL, DECL_FILE_SCOPE_P (decl), 0);
2931 /* At the end of a declaration, throw away any variable type sizes
2932 of types defined inside that declaration. There is no use
2933 computing them in the following function definition. */
2934 if (current_scope == global_scope)
2935 get_pending_sizes ();
2937 /* Install a cleanup (aka destructor) if one was given. */
2938 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
2940 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
2943 static bool eh_initialized_p;
2945 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
2946 tree cleanup_decl = lookup_name (cleanup_id);
2949 /* Build "cleanup(&decl)" for the destructor. */
2950 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
2951 cleanup = build_tree_list (NULL_TREE, cleanup);
2952 cleanup = build_function_call (cleanup_decl, cleanup);
2954 /* Don't warn about decl unused; the cleanup uses it. */
2955 TREE_USED (decl) = 1;
2957 /* Initialize EH, if we've been told to do so. */
2958 if (flag_exceptions && !eh_initialized_p)
2960 eh_initialized_p = true;
2961 eh_personality_libfunc
2962 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
2963 ? "__gcc_personality_sj0"
2964 : "__gcc_personality_v0");
2965 using_eh_for_cleanups ();
2968 add_stmt (build_stmt (CLEANUP_STMT, decl, cleanup));
2973 /* Given a parsed parameter declaration, decode it into a PARM_DECL
2974 and push that on the current scope. */
2977 push_parm_decl (tree parm)
2981 /* Don't attempt to expand sizes while parsing this decl.
2982 (We can get here with i_s_e 1 somehow from Objective-C.) */
2983 int save_immediate_size_expand = immediate_size_expand;
2984 immediate_size_expand = 0;
2986 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
2987 TREE_PURPOSE (TREE_PURPOSE (parm)),
2989 decl_attributes (&decl, TREE_VALUE (parm), 0);
2991 decl = pushdecl (decl);
2993 finish_decl (decl, NULL_TREE, NULL_TREE);
2995 immediate_size_expand = save_immediate_size_expand;
2998 /* Mark all the parameter declarations to date as forward decls,
2999 shift them to the variables list, and reset the parameters list.
3000 Also diagnose use of this extension. */
3003 mark_forward_parm_decls (void)
3007 if (pedantic && !current_scope->warned_forward_parm_decls)
3009 pedwarn ("ISO C forbids forward parameter declarations");
3010 current_scope->warned_forward_parm_decls = true;
3013 for (parm = current_scope->parms; parm; parm = TREE_CHAIN (parm))
3014 TREE_ASM_WRITTEN (parm) = 1;
3016 SCOPE_LIST_CONCAT (current_scope, names, current_scope, parms);
3017 current_scope->parms = 0;
3018 current_scope->parms_last = 0;
3021 static GTY(()) int compound_literal_number;
3023 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3024 literal, which may be an incomplete array type completed by the
3025 initializer; INIT is a CONSTRUCTOR that initializes the compound
3029 build_compound_literal (tree type, tree init)
3031 /* We do not use start_decl here because we have a type, not a declarator;
3032 and do not use finish_decl because the decl should be stored inside
3033 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_STMT. */
3034 tree decl = build_decl (VAR_DECL, NULL_TREE, type);
3037 DECL_EXTERNAL (decl) = 0;
3038 TREE_PUBLIC (decl) = 0;
3039 TREE_STATIC (decl) = (current_scope == global_scope);
3040 DECL_CONTEXT (decl) = current_function_decl;
3041 TREE_USED (decl) = 1;
3042 TREE_TYPE (decl) = type;
3043 TREE_READONLY (decl) = TREE_READONLY (type);
3044 store_init_value (decl, init);
3046 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3048 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3053 type = TREE_TYPE (decl);
3054 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3055 return error_mark_node;
3057 stmt = build_stmt (DECL_STMT, decl);
3058 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3059 TREE_SIDE_EFFECTS (complit) = 1;
3061 layout_decl (decl, 0);
3063 if (TREE_STATIC (decl))
3065 /* This decl needs a name for the assembler output. We also need
3066 a unique suffix to be added to the name. */
3069 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
3070 compound_literal_number);
3071 compound_literal_number++;
3072 DECL_NAME (decl) = get_identifier (name);
3073 DECL_DEFER_OUTPUT (decl) = 1;
3074 DECL_COMDAT (decl) = 1;
3075 DECL_ARTIFICIAL (decl) = 1;
3077 rest_of_decl_compilation (decl, NULL, 1, 0);
3083 /* Make TYPE a complete type based on INITIAL_VALUE.
3084 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3085 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3088 complete_array_type (tree type, tree initial_value, int do_default)
3090 tree maxindex = NULL_TREE;
3095 /* Note MAXINDEX is really the maximum index,
3096 one less than the size. */
3097 if (TREE_CODE (initial_value) == STRING_CST)
3100 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3101 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3104 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3106 tree elts = CONSTRUCTOR_ELTS (initial_value);
3107 maxindex = build_int_2 (-1, -1);
3108 for (; elts; elts = TREE_CHAIN (elts))
3110 if (TREE_PURPOSE (elts))
3111 maxindex = TREE_PURPOSE (elts);
3113 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3114 maxindex, integer_one_node));
3116 maxindex = copy_node (maxindex);
3120 /* Make an error message unless that happened already. */
3121 if (initial_value != error_mark_node)
3124 /* Prevent further error messages. */
3125 maxindex = build_int_2 (0, 0);
3132 maxindex = build_int_2 (0, 0);
3138 TYPE_DOMAIN (type) = build_index_type (maxindex);
3139 if (!TREE_TYPE (maxindex))
3140 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3143 /* Lay out the type now that we can get the real answer. */
3150 /* Determine whether TYPE is a structure with a flexible array member,
3151 or a union containing such a structure (possibly recursively). */
3154 flexible_array_type_p (tree type)
3157 switch (TREE_CODE (type))
3160 x = TYPE_FIELDS (type);
3163 while (TREE_CHAIN (x) != NULL_TREE)
3165 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3166 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3167 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3168 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3172 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3174 if (flexible_array_type_p (TREE_TYPE (x)))
3183 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3184 replacing with appropriate values if they are invalid. */
3186 check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
3189 unsigned int max_width;
3190 unsigned HOST_WIDE_INT w;
3191 const char *name = orig_name ? orig_name: _("<anonymous>");
3194 STRIP_NOPS (*width);
3196 /* Detect and ignore out of range field width and process valid
3198 if (TREE_CODE (*width) != INTEGER_CST)
3200 error ("bit-field `%s' width not an integer constant", name);
3201 *width = integer_one_node;
3205 constant_expression_warning (*width);
3206 if (tree_int_cst_sgn (*width) < 0)
3208 error ("negative width in bit-field `%s'", name);
3209 *width = integer_one_node;
3211 else if (integer_zerop (*width) && orig_name)
3213 error ("zero width for bit-field `%s'", name);
3214 *width = integer_one_node;
3218 /* Detect invalid bit-field type. */
3219 if (TREE_CODE (*type) != INTEGER_TYPE
3220 && TREE_CODE (*type) != BOOLEAN_TYPE
3221 && TREE_CODE (*type) != ENUMERAL_TYPE)
3223 error ("bit-field `%s' has invalid type", name);
3224 *type = unsigned_type_node;
3227 type_mv = TYPE_MAIN_VARIANT (*type);
3229 && type_mv != integer_type_node
3230 && type_mv != unsigned_type_node
3231 && type_mv != boolean_type_node)
3232 pedwarn ("type of bit-field `%s' is a GCC extension", name);
3234 if (type_mv == boolean_type_node)
3235 max_width = CHAR_TYPE_SIZE;
3237 max_width = TYPE_PRECISION (*type);
3239 if (0 < compare_tree_int (*width, max_width))
3241 error ("width of `%s' exceeds its type", name);
3243 *width = build_int_2 (w, 0);
3246 w = tree_low_cst (*width, 1);
3248 if (TREE_CODE (*type) == ENUMERAL_TYPE
3249 && (w < min_precision (TYPE_MIN_VALUE (*type), TREE_UNSIGNED (*type))
3250 || w < min_precision (TYPE_MAX_VALUE (*type), TREE_UNSIGNED (*type))))
3251 warning ("`%s' is narrower than values of its type", name);
3254 /* Given declspecs and a declarator,
3255 determine the name and type of the object declared
3256 and construct a ..._DECL node for it.
3257 (In one case we can return a ..._TYPE node instead.
3258 For invalid input we sometimes return 0.)
3260 DECLSPECS is a chain of tree_list nodes whose value fields
3261 are the storage classes and type specifiers.
3263 DECL_CONTEXT says which syntactic context this declaration is in:
3264 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3265 FUNCDEF for a function definition. Like NORMAL but a few different
3266 error messages in each case. Return value may be zero meaning
3267 this definition is too screwy to try to parse.
3268 PARM for a parameter declaration (either within a function prototype
3269 or before a function body). Make a PARM_DECL, or return void_type_node.
3270 TYPENAME if for a typename (in a cast or sizeof).
3271 Don't make a DECL node; just return the ..._TYPE node.
3272 FIELD for a struct or union field; make a FIELD_DECL.
3273 INITIALIZED is 1 if the decl has an initializer.
3274 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3275 representing the width of the bit-field.
3277 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3278 It may also be so in the PARM case, for a prototype where the
3279 argument type is specified but not the name.
3281 This function is where the complicated C meanings of `static'
3282 and `extern' are interpreted. */
3285 grokdeclarator (tree declarator, tree declspecs,
3286 enum decl_context decl_context, int initialized, tree *width)
3290 tree type = NULL_TREE;
3295 int type_quals = TYPE_UNQUALIFIED;
3297 int explicit_int = 0;
3298 int explicit_char = 0;
3299 int defaulted_int = 0;
3300 tree typedef_decl = 0;
3301 const char *name, *orig_name;
3302 tree typedef_type = 0;
3303 int funcdef_flag = 0;
3304 enum tree_code innermost_code = ERROR_MARK;
3305 int size_varies = 0;
3306 tree decl_attr = NULL_TREE;
3307 tree array_ptr_quals = NULL_TREE;
3308 int array_parm_static = 0;
3309 tree returned_attrs = NULL_TREE;
3310 bool bitfield = width != NULL;
3313 if (decl_context == FUNCDEF)
3314 funcdef_flag = 1, decl_context = NORMAL;
3316 /* Look inside a declarator for the name being declared
3317 and get it as a string, for an error message. */
3319 tree decl = declarator;
3323 switch (TREE_CODE (decl))
3328 innermost_code = TREE_CODE (decl);
3329 decl = TREE_OPERAND (decl, 0);
3333 decl = TREE_VALUE (decl);
3336 case IDENTIFIER_NODE:
3337 name = IDENTIFIER_POINTER (decl);
3349 /* A function definition's declarator must have the form of
3350 a function declarator. */
3352 if (funcdef_flag && innermost_code != CALL_EXPR)
3355 /* If this looks like a function definition, make it one,
3356 even if it occurs where parms are expected.
3357 Then store_parm_decls will reject it and not use it as a parm. */
3358 if (decl_context == NORMAL && !funcdef_flag
3359 && current_scope->parm_flag)
3360 decl_context = PARM;
3362 /* Look through the decl specs and record which ones appear.
3363 Some typespecs are defined as built-in typenames.
3364 Others, the ones that are modifiers of other types,
3365 are represented by bits in SPECBITS: set the bits for
3366 the modifiers that appear. Storage class keywords are also in SPECBITS.
3368 If there is a typedef name or a type, store the type in TYPE.
3369 This includes builtin typedefs such as `int'.
3371 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3372 and did not come from a user typedef.
3374 Set LONGLONG if `long' is mentioned twice. */
3376 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3378 tree id = TREE_VALUE (spec);
3380 /* If the entire declaration is itself tagged as deprecated then
3381 suppress reports of deprecated items. */
3382 if (id && TREE_DEPRECATED (id))
3384 if (deprecated_state != DEPRECATED_SUPPRESS)
3385 warn_deprecated_use (id);
3388 if (id == ridpointers[(int) RID_INT])
3390 if (id == ridpointers[(int) RID_CHAR])
3393 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3395 enum rid i = C_RID_CODE (id);
3396 if ((int) i <= (int) RID_LAST_MODIFIER)
3398 if (i == RID_LONG && (specbits & (1 << (int) RID_LONG)))
3401 error ("`long long long' is too long for GCC");
3404 if (pedantic && !flag_isoc99 && ! in_system_header
3406 pedwarn ("ISO C90 does not support `long long'");
3410 else if (specbits & (1 << (int) i))
3412 if (i == RID_CONST || i == RID_VOLATILE || i == RID_RESTRICT)
3415 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3418 error ("duplicate `%s'", IDENTIFIER_POINTER (id));
3421 /* Diagnose "__thread extern". Recall that this list
3422 is in the reverse order seen in the text. */
3424 && (specbits & (1 << (int) RID_EXTERN
3425 | 1 << (int) RID_STATIC)))
3427 if (specbits & 1 << (int) RID_EXTERN)
3428 error ("`__thread' before `extern'");
3430 error ("`__thread' before `static'");
3433 specbits |= 1 << (int) i;
3438 error ("two or more data types in declaration of `%s'", name);
3439 /* Actual typedefs come to us as TYPE_DECL nodes. */
3440 else if (TREE_CODE (id) == TYPE_DECL)
3442 if (TREE_TYPE (id) == error_mark_node)
3443 ; /* Allow the type to default to int to avoid cascading errors. */
3446 type = TREE_TYPE (id);
3447 decl_attr = DECL_ATTRIBUTES (id);
3451 /* Built-in types come as identifiers. */
3452 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3454 tree t = lookup_name (id);
3455 if (TREE_TYPE (t) == error_mark_node)
3457 else if (!t || TREE_CODE (t) != TYPE_DECL)
3458 error ("`%s' fails to be a typedef or built in type",
3459 IDENTIFIER_POINTER (id));
3462 type = TREE_TYPE (t);
3466 else if (TREE_CODE (id) != ERROR_MARK)
3473 typedef_type = type;
3475 size_varies = C_TYPE_VARIABLE_SIZE (type);
3477 /* No type at all: default to `int', and set DEFAULTED_INT
3478 because it was not a user-defined typedef. */
3482 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3483 | (1 << (int) RID_SIGNED)
3484 | (1 << (int) RID_UNSIGNED)
3485 | (1 << (int) RID_COMPLEX))))
3486 /* Don't warn about typedef foo = bar. */
3487 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
3488 && ! in_system_header)
3490 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
3491 and this is a function, or if -Wimplicit; prefer the former
3492 warning since it is more explicit. */
3493 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3495 warn_about_return_type = 1;
3496 else if (warn_implicit_int || flag_isoc99)
3497 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
3502 type = integer_type_node;
3505 /* Now process the modifiers that were specified
3506 and check for invalid combinations. */
3508 /* Long double is a special combination. */
3510 if ((specbits & 1 << (int) RID_LONG) && ! longlong
3511 && TYPE_MAIN_VARIANT (type) == double_type_node)
3513 specbits &= ~(1 << (int) RID_LONG);
3514 type = long_double_type_node;
3517 /* Check all other uses of type modifiers. */
3519 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3520 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3524 if ((specbits & 1 << (int) RID_LONG)
3525 && (specbits & 1 << (int) RID_SHORT))
3526 error ("both long and short specified for `%s'", name);
3527 else if (((specbits & 1 << (int) RID_LONG)
3528 || (specbits & 1 << (int) RID_SHORT))
3530 error ("long or short specified with char for `%s'", name);
3531 else if (((specbits & 1 << (int) RID_LONG)
3532 || (specbits & 1 << (int) RID_SHORT))
3533 && TREE_CODE (type) == REAL_TYPE)
3535 static int already = 0;
3537 error ("long or short specified with floating type for `%s'", name);
3538 if (! already && ! pedantic)
3540 error ("the only valid combination is `long double'");
3544 else if ((specbits & 1 << (int) RID_SIGNED)
3545 && (specbits & 1 << (int) RID_UNSIGNED))
3546 error ("both signed and unsigned specified for `%s'", name);
3547 else if (TREE_CODE (type) != INTEGER_TYPE)
3548 error ("long, short, signed or unsigned invalid for `%s'", name);
3552 if (!explicit_int && !defaulted_int && !explicit_char)
3554 error ("long, short, signed or unsigned used invalidly for `%s'",
3560 /* Discard the type modifiers if they are invalid. */
3563 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3564 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
3569 if ((specbits & (1 << (int) RID_COMPLEX))
3570 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
3572 error ("complex invalid for `%s'", name);
3573 specbits &= ~(1 << (int) RID_COMPLEX);
3576 /* Decide whether an integer type is signed or not.
3577 Optionally treat bit-fields as signed by default. */
3578 if (specbits & 1 << (int) RID_UNSIGNED
3579 || (bitfield && ! flag_signed_bitfields
3580 && (explicit_int || defaulted_int || explicit_char
3581 /* A typedef for plain `int' without `signed'
3582 can be controlled just like plain `int'. */
3583 || ! (typedef_decl != 0
3584 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
3585 && TREE_CODE (type) != ENUMERAL_TYPE
3586 && !(specbits & 1 << (int) RID_SIGNED)))
3589 type = long_long_unsigned_type_node;
3590 else if (specbits & 1 << (int) RID_LONG)
3591 type = long_unsigned_type_node;
3592 else if (specbits & 1 << (int) RID_SHORT)
3593 type = short_unsigned_type_node;
3594 else if (type == char_type_node)
3595 type = unsigned_char_type_node;
3596 else if (typedef_decl)
3597 type = c_common_unsigned_type (type);
3599 type = unsigned_type_node;
3601 else if ((specbits & 1 << (int) RID_SIGNED)
3602 && type == char_type_node)
3603 type = signed_char_type_node;
3605 type = long_long_integer_type_node;
3606 else if (specbits & 1 << (int) RID_LONG)
3607 type = long_integer_type_node;
3608 else if (specbits & 1 << (int) RID_SHORT)
3609 type = short_integer_type_node;
3611 if (specbits & 1 << (int) RID_COMPLEX)
3613 if (pedantic && !flag_isoc99)
3614 pedwarn ("ISO C90 does not support complex types");
3615 /* If we just have "complex", it is equivalent to
3616 "complex double", but if any modifiers at all are specified it is
3617 the complex form of TYPE. E.g, "complex short" is
3618 "complex short int". */
3620 if (defaulted_int && ! longlong
3621 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3622 | (1 << (int) RID_SIGNED)
3623 | (1 << (int) RID_UNSIGNED))))
3626 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
3627 type = complex_double_type_node;
3629 else if (type == integer_type_node)
3632 pedwarn ("ISO C does not support complex integer types");
3633 type = complex_integer_type_node;
3635 else if (type == float_type_node)
3636 type = complex_float_type_node;
3637 else if (type == double_type_node)
3638 type = complex_double_type_node;
3639 else if (type == long_double_type_node)
3640 type = complex_long_double_type_node;
3644 pedwarn ("ISO C does not support complex integer types");
3645 type = build_complex_type (type);
3649 /* Check the type and width of a bit-field. */
3651 check_bitfield_type_and_width (&type, width, orig_name);
3653 /* Figure out the type qualifiers for the declaration. There are
3654 two ways a declaration can become qualified. One is something
3655 like `const int i' where the `const' is explicit. Another is
3656 something like `typedef const int CI; CI i' where the type of the
3657 declaration contains the `const'. A third possibility is that
3658 there is a type qualifier on the element type of a typedefed
3659 array type, in which case we should extract that qualifier so
3660 that c_apply_type_quals_to_decls receives the full list of
3661 qualifiers to work with (C90 is not entirely clear about whether
3662 duplicate qualifiers should be diagnosed in this case, but it
3663 seems most appropriate to do so). */
3664 element_type = strip_array_types (type);
3665 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (element_type);
3667 = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (element_type);
3669 = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (element_type);
3670 inlinep = !! (specbits & (1 << (int) RID_INLINE));
3671 if (constp > 1 && ! flag_isoc99)
3672 pedwarn ("duplicate `const'");
3673 if (restrictp > 1 && ! flag_isoc99)
3674 pedwarn ("duplicate `restrict'");
3675 if (volatilep > 1 && ! flag_isoc99)
3676 pedwarn ("duplicate `volatile'");
3677 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
3678 type = TYPE_MAIN_VARIANT (type);
3679 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3680 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3681 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3683 /* Warn if two storage classes are given. Default to `auto'. */
3688 if (specbits & 1 << (int) RID_AUTO) nclasses++;
3689 if (specbits & 1 << (int) RID_STATIC) nclasses++;
3690 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
3691 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
3692 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
3694 /* "static __thread" and "extern __thread" are allowed. */
3695 if ((specbits & (1 << (int) RID_THREAD
3696 | 1 << (int) RID_STATIC
3697 | 1 << (int) RID_EXTERN)) == (1 << (int) RID_THREAD))
3700 /* Warn about storage classes that are invalid for certain
3701 kinds of declarations (parameters, typenames, etc.). */
3704 error ("multiple storage classes in declaration of `%s'", name);
3705 else if (funcdef_flag
3707 & ((1 << (int) RID_REGISTER)
3708 | (1 << (int) RID_AUTO)
3709 | (1 << (int) RID_TYPEDEF)
3710 | (1 << (int) RID_THREAD))))
3712 if (specbits & 1 << (int) RID_AUTO
3713 && (pedantic || current_scope == global_scope))
3714 pedwarn ("function definition declared `auto'");
3715 if (specbits & 1 << (int) RID_REGISTER)
3716 error ("function definition declared `register'");
3717 if (specbits & 1 << (int) RID_TYPEDEF)
3718 error ("function definition declared `typedef'");
3719 if (specbits & 1 << (int) RID_THREAD)
3720 error ("function definition declared `__thread'");
3721 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3722 | (1 << (int) RID_AUTO) | (1 << (int) RID_THREAD));
3724 else if (decl_context != NORMAL && nclasses > 0)
3726 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
3730 switch (decl_context)
3733 error ("storage class specified for structure field `%s'",
3737 error ("storage class specified for parameter `%s'", name);
3740 error ("storage class specified for typename");
3743 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3744 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
3745 | (1 << (int) RID_EXTERN) | (1 << (int) RID_THREAD));
3748 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
3750 /* `extern' with initialization is invalid if not at file scope. */
3751 if (current_scope == global_scope)
3752 warning ("`%s' initialized and declared `extern'", name);
3754 error ("`%s' has both `extern' and initializer", name);
3756 else if (current_scope == global_scope)
3758 if (specbits & 1 << (int) RID_AUTO)
3759 error ("file-scope declaration of `%s' specifies `auto'", name);
3763 if (specbits & 1 << (int) RID_EXTERN && funcdef_flag)
3764 error ("nested function `%s' declared `extern'", name);
3765 else if ((specbits & (1 << (int) RID_THREAD
3766 | 1 << (int) RID_EXTERN
3767 | 1 << (int) RID_STATIC))
3768 == (1 << (int) RID_THREAD))
3770 error ("function-scope `%s' implicitly auto and declared `__thread'",
3772 specbits &= ~(1 << (int) RID_THREAD);
3777 /* Now figure out the structure of the declarator proper.
3778 Descend through it, creating more complex types, until we reach
3779 the declared identifier (or NULL_TREE, in an absolute declarator). */
3781 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
3783 if (type == error_mark_node)
3785 declarator = TREE_OPERAND (declarator, 0);
3789 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
3790 an INDIRECT_REF (for *...),
3791 a CALL_EXPR (for ...(...)),
3792 a TREE_LIST (for nested attributes),
3793 an identifier (for the name being declared)
3794 or a null pointer (for the place in an absolute declarator
3795 where the name was omitted).
3796 For the last two cases, we have just exited the loop.
3798 At this point, TYPE is the type of elements of an array,
3799 or for a function to return, or for a pointer to point to.
3800 After this sequence of ifs, TYPE is the type of the
3801 array or function or pointer, and DECLARATOR has had its
3802 outermost layer removed. */
3804 if (array_ptr_quals != NULL_TREE || array_parm_static)
3806 /* Only the innermost declarator (making a parameter be of
3807 array type which is converted to pointer type)
3808 may have static or type qualifiers. */
3809 error ("static or type qualifiers in non-parameter array declarator");
3810 array_ptr_quals = NULL_TREE;
3811 array_parm_static = 0;
3814 if (TREE_CODE (declarator) == TREE_LIST)
3816 /* We encode a declarator with embedded attributes using
3818 tree attrs = TREE_PURPOSE (declarator);
3821 declarator = TREE_VALUE (declarator);
3822 inner_decl = declarator;
3823 while (inner_decl != NULL_TREE
3824 && TREE_CODE (inner_decl) == TREE_LIST)
3825 inner_decl = TREE_VALUE (inner_decl);
3826 if (inner_decl == NULL_TREE
3827 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
3828 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
3829 else if (TREE_CODE (inner_decl) == CALL_EXPR)
3830 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
3831 else if (TREE_CODE (inner_decl) == ARRAY_REF)
3832 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
3833 returned_attrs = decl_attributes (&type,
3834 chainon (returned_attrs, attrs),
3837 else if (TREE_CODE (declarator) == ARRAY_REF)
3839 tree itype = NULL_TREE;
3840 tree size = TREE_OPERAND (declarator, 1);
3841 /* The index is a signed object `sizetype' bits wide. */
3842 tree index_type = c_common_signed_type (sizetype);
3844 array_ptr_quals = TREE_TYPE (declarator);
3845 array_parm_static = TREE_STATIC (declarator);
3847 declarator = TREE_OPERAND (declarator, 0);
3849 /* Check for some types that there cannot be arrays of. */
3851 if (VOID_TYPE_P (type))
3853 error ("declaration of `%s' as array of voids", name);
3854 type = error_mark_node;
3857 if (TREE_CODE (type) == FUNCTION_TYPE)
3859 error ("declaration of `%s' as array of functions", name);
3860 type = error_mark_node;
3863 if (pedantic && flexible_array_type_p (type))
3864 pedwarn ("invalid use of structure with flexible array member");
3866 if (size == error_mark_node)
3867 type = error_mark_node;
3869 if (type == error_mark_node)
3872 /* If size was specified, set ITYPE to a range-type for that size.
3873 Otherwise, ITYPE remains null. finish_decl may figure it out
3874 from an initial value. */
3878 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3879 STRIP_TYPE_NOPS (size);
3881 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
3883 error ("size of array `%s' has non-integer type", name);
3884 size = integer_one_node;
3887 if (pedantic && integer_zerop (size))
3888 pedwarn ("ISO C forbids zero-size array `%s'", name);
3890 if (TREE_CODE (size) == INTEGER_CST)
3892 constant_expression_warning (size);
3893 if (tree_int_cst_sgn (size) < 0)
3895 error ("size of array `%s' is negative", name);
3896 size = integer_one_node;
3901 /* Make sure the array size remains visibly nonconstant
3902 even if it is (eg) a const variable with known value. */
3905 if (!flag_isoc99 && pedantic)
3907 if (TREE_CONSTANT (size))
3908 pedwarn ("ISO C90 forbids array `%s' whose size can't be evaluated",
3911 pedwarn ("ISO C90 forbids variable-size array `%s'",
3916 if (integer_zerop (size))
3918 /* A zero-length array cannot be represented with an
3919 unsigned index type, which is what we'll get with
3920 build_index_type. Create an open-ended range instead. */
3921 itype = build_range_type (sizetype, size, NULL_TREE);
3925 /* Compute the maximum valid index, that is, size - 1.
3926 Do the calculation in index_type, so that if it is
3927 a variable the computations will be done in the
3929 itype = fold (build (MINUS_EXPR, index_type,
3930 convert (index_type, size),
3931 convert (index_type, size_one_node)));
3933 /* If that overflowed, the array is too big.
3934 ??? While a size of INT_MAX+1 technically shouldn't
3935 cause an overflow (because we subtract 1), the overflow
3936 is recorded during the conversion to index_type, before
3937 the subtraction. Handling this case seems like an
3938 unnecessary complication. */
3939 if (TREE_OVERFLOW (itype))
3941 error ("size of array `%s' is too large", name);
3942 type = error_mark_node;
3948 /* We must be able to distinguish the
3949 SAVE_EXPR_CONTEXT for the variably-sized type
3950 so that we can set it correctly in
3951 set_save_expr_context. The convention is
3952 that all SAVE_EXPRs that need to be reset
3953 have NULL_TREE for their SAVE_EXPR_CONTEXT. */
3954 tree cfd = current_function_decl;
3955 if (decl_context == PARM)
3956 current_function_decl = NULL_TREE;
3957 itype = variable_size (itype);
3958 if (decl_context == PARM)
3959 current_function_decl = cfd;
3961 itype = build_index_type (itype);
3964 else if (decl_context == FIELD)
3966 if (pedantic && !flag_isoc99 && !in_system_header)
3967 pedwarn ("ISO C90 does not support flexible array members");
3969 /* ISO C99 Flexible array members are effectively identical
3970 to GCC's zero-length array extension. */
3971 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
3974 /* If pedantic, complain about arrays of incomplete types. */
3976 if (pedantic && !COMPLETE_TYPE_P (type))
3977 pedwarn ("array type has incomplete element type");
3979 /* Build the array type itself, then merge any constancy or
3980 volatility into the target type. We must do it in this order
3981 to ensure that the TYPE_MAIN_VARIANT field of the array type
3982 is set correctly. */
3984 type = build_array_type (type, itype);
3986 type = c_build_qualified_type (type, type_quals);
3989 C_TYPE_VARIABLE_SIZE (type) = 1;
3991 /* The GCC extension for zero-length arrays differs from
3992 ISO flexible array members in that sizeof yields zero. */
3993 if (size && integer_zerop (size))
3996 TYPE_SIZE (type) = bitsize_zero_node;
3997 TYPE_SIZE_UNIT (type) = size_zero_node;
3999 if (decl_context != PARM
4000 && (array_ptr_quals != NULL_TREE || array_parm_static))
4002 error ("static or type qualifiers in non-parameter array declarator");
4003 array_ptr_quals = NULL_TREE;
4004 array_parm_static = 0;
4007 else if (TREE_CODE (declarator) == CALL_EXPR)
4011 /* Declaring a function type.
4012 Make sure we have a valid type for the function to return. */
4013 if (type == error_mark_node)
4018 /* Warn about some types functions can't return. */
4020 if (TREE_CODE (type) == FUNCTION_TYPE)
4022 error ("`%s' declared as function returning a function", name);
4023 type = integer_type_node;
4025 if (TREE_CODE (type) == ARRAY_TYPE)
4027 error ("`%s' declared as function returning an array", name);
4028 type = integer_type_node;
4031 /* Construct the function type and go to the next
4032 inner layer of declarator. */
4034 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4036 /* Say it's a definition
4037 only for the CALL_EXPR
4038 closest to the identifier. */
4039 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4040 /* Type qualifiers before the return type of the function
4041 qualify the return type, not the function type. */
4044 /* Type qualifiers on a function return type are normally
4045 permitted by the standard but have no effect, so give a
4046 warning at -Wextra. Qualifiers on a void return type have
4047 meaning as a GNU extension, and are banned on function
4048 definitions in ISO C. FIXME: strictly we shouldn't
4049 pedwarn for qualified void return types except on function
4050 definitions, but not doing so could lead to the undesirable
4051 state of a "volatile void" function return type not being
4052 warned about, and a use of the function being compiled
4053 with GNU semantics, with no diagnostics under -pedantic. */
4054 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4055 pedwarn ("ISO C forbids qualified void function return type");
4056 else if (extra_warnings
4057 && !(VOID_TYPE_P (type)
4058 && type_quals == TYPE_QUAL_VOLATILE))
4059 warning ("type qualifiers ignored on function return type");
4061 type = c_build_qualified_type (type, type_quals);
4063 type_quals = TYPE_UNQUALIFIED;
4065 type = build_function_type (type, arg_types);
4066 declarator = TREE_OPERAND (declarator, 0);
4068 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4069 the formal parameter list of this FUNCTION_TYPE to point to
4070 the FUNCTION_TYPE node itself. */
4075 for (link = last_function_parm_tags;
4077 link = TREE_CHAIN (link))
4078 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4081 else if (TREE_CODE (declarator) == INDIRECT_REF)
4083 /* Merge any constancy or volatility into the target type
4086 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4088 pedwarn ("ISO C forbids qualified function types");
4090 type = c_build_qualified_type (type, type_quals);
4091 type_quals = TYPE_UNQUALIFIED;
4094 type = build_pointer_type (type);
4096 /* Process a list of type modifier keywords
4097 (such as const or volatile) that were given inside the `*'. */
4099 if (TREE_TYPE (declarator))
4107 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4108 typemodlist = TREE_CHAIN (typemodlist))
4110 tree qualifier = TREE_VALUE (typemodlist);
4112 if (C_IS_RESERVED_WORD (qualifier))
4114 if (C_RID_CODE (qualifier) == RID_CONST)
4116 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4118 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4128 error ("invalid type modifier within pointer declarator");
4129 if (constp > 1 && ! flag_isoc99)
4130 pedwarn ("duplicate `const'");
4131 if (volatilep > 1 && ! flag_isoc99)
4132 pedwarn ("duplicate `volatile'");
4133 if (restrictp > 1 && ! flag_isoc99)
4134 pedwarn ("duplicate `restrict'");
4136 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4137 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4138 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4141 declarator = TREE_OPERAND (declarator, 0);
4148 /* Now TYPE has the actual type. */
4150 /* Did array size calculations overflow? */
4152 if (TREE_CODE (type) == ARRAY_TYPE
4153 && COMPLETE_TYPE_P (type)
4154 && TREE_OVERFLOW (TYPE_SIZE (type)))
4156 error ("size of array `%s' is too large", name);
4157 /* If we proceed with the array type as it is, we'll eventually
4158 crash in tree_low_cst(). */
4159 type = error_mark_node;
4162 /* If this is declaring a typedef name, return a TYPE_DECL. */
4164 if (specbits & (1 << (int) RID_TYPEDEF))
4167 /* Note that the grammar rejects storage classes
4168 in typenames, fields or parameters */
4169 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4171 pedwarn ("ISO C forbids qualified function types");
4173 type = c_build_qualified_type (type, type_quals);
4174 decl = build_decl (TYPE_DECL, declarator, type);
4175 if ((specbits & (1 << (int) RID_SIGNED))
4176 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4177 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4178 decl_attributes (&decl, returned_attrs, 0);
4182 /* Detect the case of an array type of unspecified size
4183 which came, as such, direct from a typedef name.
4184 We must copy the type, so that each identifier gets
4185 a distinct type, so that each identifier's size can be
4186 controlled separately by its own initializer. */
4188 if (type != 0 && typedef_type != 0
4189 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4190 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4192 type = build_array_type (TREE_TYPE (type), 0);
4194 C_TYPE_VARIABLE_SIZE (type) = 1;
4197 /* If this is a type name (such as, in a cast or sizeof),
4198 compute the type and return it now. */
4200 if (decl_context == TYPENAME)
4202 /* Note that the grammar rejects storage classes
4203 in typenames, fields or parameters */
4204 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4206 pedwarn ("ISO C forbids const or volatile function types");
4208 type = c_build_qualified_type (type, type_quals);
4209 decl_attributes (&type, returned_attrs, 0);
4213 /* Aside from typedefs and type names (handle above),
4214 `void' at top level (not within pointer)
4215 is allowed only in public variables.
4216 We don't complain about parms either, but that is because
4217 a better error message can be made later. */
4219 if (VOID_TYPE_P (type) && decl_context != PARM
4220 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4221 && ((specbits & (1 << (int) RID_EXTERN))
4222 || (current_scope == global_scope
4224 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4226 error ("variable or field `%s' declared void", name);
4227 type = integer_type_node;
4230 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4231 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4236 if (decl_context == PARM)
4238 tree type_as_written;
4241 /* A parameter declared as an array of T is really a pointer to T.
4242 One declared as a function is really a pointer to a function. */
4244 if (TREE_CODE (type) == ARRAY_TYPE)
4246 /* Transfer const-ness of array into that of type pointed to. */
4247 type = TREE_TYPE (type);
4249 type = c_build_qualified_type (type, type_quals);
4250 type = build_pointer_type (type);
4251 type_quals = TYPE_UNQUALIFIED;
4252 if (array_ptr_quals)
4254 tree new_ptr_quals, new_ptr_attrs;
4256 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4257 /* We don't yet implement attributes in this context. */
4258 if (new_ptr_attrs != NULL_TREE)
4259 warning ("attributes in parameter array declarator ignored");
4264 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4266 tree qualifier = TREE_VALUE (new_ptr_quals);
4268 if (C_IS_RESERVED_WORD (qualifier))
4270 if (C_RID_CODE (qualifier) == RID_CONST)
4272 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4274 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4284 error ("invalid type modifier within array declarator");
4286 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4287 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4288 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4292 else if (TREE_CODE (type) == FUNCTION_TYPE)
4294 if (pedantic && type_quals)
4295 pedwarn ("ISO C forbids qualified function types");
4297 type = c_build_qualified_type (type, type_quals);
4298 type = build_pointer_type (type);
4299 type_quals = TYPE_UNQUALIFIED;
4301 else if (type_quals)
4302 type = c_build_qualified_type (type, type_quals);
4304 type_as_written = type;
4306 decl = build_decl (PARM_DECL, declarator, type);
4308 C_DECL_VARIABLE_SIZE (decl) = 1;
4310 /* Compute the type actually passed in the parmlist,
4311 for the case where there is no prototype.
4312 (For example, shorts and chars are passed as ints.)
4313 When there is a prototype, this is overridden later. */
4315 if (type == error_mark_node)
4316 promoted_type = type;
4318 promoted_type = c_type_promotes_to (type);
4320 DECL_ARG_TYPE (decl) = promoted_type;
4321 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4323 else if (decl_context == FIELD)
4325 /* Structure field. It may not be a function. */
4327 if (TREE_CODE (type) == FUNCTION_TYPE)
4329 error ("field `%s' declared as a function", name);
4330 type = build_pointer_type (type);
4332 else if (TREE_CODE (type) != ERROR_MARK
4333 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4335 error ("field `%s' has incomplete type", name);
4336 type = error_mark_node;
4338 /* Move type qualifiers down to element of an array. */
4339 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4340 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4342 TYPE_DOMAIN (type));
4343 decl = build_decl (FIELD_DECL, declarator, type);
4344 DECL_NONADDRESSABLE_P (decl) = bitfield;
4347 C_DECL_VARIABLE_SIZE (decl) = 1;
4349 else if (TREE_CODE (type) == FUNCTION_TYPE)
4351 /* Every function declaration is "external"
4352 except for those which are inside a function body
4353 in which `auto' is used.
4354 That is a case not specified by ANSI C,
4355 and we use it for forward declarations for nested functions. */
4356 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4357 || current_scope == global_scope);
4359 if (specbits & (1 << (int) RID_AUTO)
4360 && (pedantic || current_scope == global_scope))
4361 pedwarn ("invalid storage class for function `%s'", name);
4362 if (specbits & (1 << (int) RID_REGISTER))
4363 error ("invalid storage class for function `%s'", name);
4364 if (specbits & (1 << (int) RID_THREAD))
4365 error ("invalid storage class for function `%s'", name);
4366 /* Function declaration not at file scope.
4367 Storage classes other than `extern' are not allowed
4368 and `extern' makes no difference. */
4369 if (current_scope != global_scope
4370 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4372 pedwarn ("invalid storage class for function `%s'", name);
4374 decl = build_decl (FUNCTION_DECL, declarator, type);
4375 decl = build_decl_attribute_variant (decl, decl_attr);
4377 DECL_LANG_SPECIFIC (decl)
4378 = ggc_alloc_cleared (sizeof (struct lang_decl));
4380 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4381 pedwarn ("ISO C forbids qualified function types");
4383 /* GNU C interprets a `volatile void' return type to indicate
4384 that the function does not return. */
4385 if ((type_quals & TYPE_QUAL_VOLATILE)
4386 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4387 warning ("`noreturn' function returns non-void value");
4390 DECL_EXTERNAL (decl) = 1;
4391 /* Record absence of global scope for `static' or `auto'. */
4393 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4396 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4398 /* Record presence of `inline', if it is reasonable. */
4399 if (MAIN_NAME_P (declarator))
4402 warning ("cannot inline function `main'");
4406 /* Record that the function is declared `inline'. */
4407 DECL_DECLARED_INLINE_P (decl) = 1;
4409 /* Do not mark bare declarations as DECL_INLINE. Doing so
4410 in the presence of multiple declarations can result in
4411 the abstract origin pointing between the declarations,
4412 which will confuse dwarf2out. */
4415 DECL_INLINE (decl) = 1;
4416 if (specbits & (1 << (int) RID_EXTERN))
4417 current_extern_inline = 1;
4420 /* If -finline-functions, assume it can be inlined. This does
4421 two things: let the function be deferred until it is actually
4422 needed, and let dwarf2 know that the function is inlinable. */
4423 else if (flag_inline_trees == 2 && initialized)
4424 DECL_INLINE (decl) = 1;
4428 /* It's a variable. */
4429 /* An uninitialized decl with `extern' is a reference. */
4430 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4432 /* Move type qualifiers down to element of an array. */
4433 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4435 int saved_align = TYPE_ALIGN(type);
4436 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4438 TYPE_DOMAIN (type));
4439 TYPE_ALIGN (type) = saved_align;
4441 else if (type_quals)
4442 type = c_build_qualified_type (type, type_quals);
4444 /* It is invalid to create an `extern' declaration for a
4445 variable if there is a global declaration that is
4447 if (extern_ref && current_scope != global_scope)
4451 global_decl = identifier_global_value (declarator);
4453 && TREE_CODE (global_decl) == VAR_DECL
4454 && !TREE_PUBLIC (global_decl))
4455 error ("variable previously declared `static' redeclared "
4459 decl = build_decl (VAR_DECL, declarator, type);
4461 C_DECL_VARIABLE_SIZE (decl) = 1;
4464 pedwarn ("%Jvariable '%D' declared `inline'", decl, decl);
4466 DECL_EXTERNAL (decl) = extern_ref;
4468 /* At file scope, the presence of a `static' or `register' storage
4469 class specifier, or the absence of all storage class specifiers
4470 makes this declaration a definition (perhaps tentative). Also,
4471 the absence of both `static' and `register' makes it public. */
4472 if (current_scope == global_scope)
4474 TREE_PUBLIC (decl) = !(specbits & ((1 << (int) RID_STATIC)
4475 | (1 << (int) RID_REGISTER)));
4476 TREE_STATIC (decl) = !extern_ref;
4478 /* Not at file scope, only `static' makes a static definition. */
4481 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4482 TREE_PUBLIC (decl) = extern_ref;
4485 if (specbits & 1 << (int) RID_THREAD)
4487 if (targetm.have_tls)
4488 DECL_THREAD_LOCAL (decl) = 1;
4490 /* A mere warning is sure to result in improper semantics
4491 at runtime. Don't bother to allow this to compile. */
4492 error ("thread-local storage not supported for this target");
4496 /* Record `register' declaration for warnings on &
4497 and in case doing stupid register allocation. */
4499 if (specbits & (1 << (int) RID_REGISTER))
4500 DECL_REGISTER (decl) = 1;
4502 /* Record constancy and volatility. */
4503 c_apply_type_quals_to_decl (type_quals, decl);
4505 /* If a type has volatile components, it should be stored in memory.
4506 Otherwise, the fact that those components are volatile
4507 will be ignored, and would even crash the compiler. */
4508 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4509 c_mark_addressable (decl);
4511 #ifdef ENABLE_CHECKING
4512 /* This is the earliest point at which we might know the assembler
4513 name of a variable. Thus, if it's known before this, die horribly. */
4514 if (DECL_ASSEMBLER_NAME_SET_P (decl))
4518 decl_attributes (&decl, returned_attrs, 0);
4524 /* Decode the parameter-list info for a function type or function definition.
4525 The argument is the value returned by `get_parm_info' (or made in parse.y
4526 if there is an identifier list instead of a parameter decl list).
4527 These two functions are separate because when a function returns
4528 or receives functions then each is called multiple times but the order
4529 of calls is different. The last call to `grokparms' is always the one
4530 that contains the formal parameter names of a function definition.
4532 Store in `last_function_parms' a chain of the decls of parms.
4533 Also store in `last_function_parm_tags' a chain of the struct, union,
4534 and enum tags declared among the parms.
4536 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4538 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4539 a mere declaration. A nonempty identifier-list gets an error message
4540 when FUNCDEF_FLAG is zero. */
4543 grokparms (tree parms_info, int funcdef_flag)
4545 tree first_parm = TREE_CHAIN (parms_info);
4547 last_function_parms = TREE_PURPOSE (parms_info);
4548 last_function_parm_tags = TREE_VALUE (parms_info);
4549 last_function_parm_others = TREE_TYPE (parms_info);
4551 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4552 && !in_system_header)
4553 warning ("function declaration isn't a prototype");
4556 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4559 pedwarn ("parameter names (without types) in function declaration");
4561 last_function_parms = first_parm;
4568 /* If the arg types are incomplete in a declaration,
4569 they must include undefined tags.
4570 These tags can never be defined in the scope of the declaration,
4571 so the types can never be completed,
4572 and no call can be compiled successfully. */
4574 for (parm = last_function_parms, typelt = first_parm;
4576 parm = TREE_CHAIN (parm))
4577 /* Skip over any enumeration constants declared here. */
4578 if (TREE_CODE (parm) == PARM_DECL)
4580 /* Barf if the parameter itself has an incomplete type. */
4581 tree type = TREE_VALUE (typelt);
4582 if (type == error_mark_node)
4584 if (!COMPLETE_TYPE_P (type))
4586 if (funcdef_flag && DECL_NAME (parm) != 0)
4587 error ("parameter `%s' has incomplete type",
4588 IDENTIFIER_POINTER (DECL_NAME (parm)));
4590 warning ("parameter has incomplete type");
4593 TREE_VALUE (typelt) = error_mark_node;
4594 TREE_TYPE (parm) = error_mark_node;
4597 typelt = TREE_CHAIN (typelt);
4604 /* Return a tree_list node with info on a parameter list just parsed.
4605 The TREE_PURPOSE is a list of decls of those parms.
4606 The TREE_VALUE is a list of structure, union and enum tags defined.
4607 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4608 The TREE_TYPE is a list of non-parameter decls which appeared with the
4610 This tree_list node is later fed to `grokparms'.
4612 VOID_AT_END nonzero means append `void' to the end of the type-list.
4613 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4616 get_parm_info (int void_at_end)
4618 tree decl, type, list;
4620 tree *last_type = &types;
4621 tree tags = current_scope->tags;
4622 tree parms = current_scope->parms;
4623 tree others = current_scope->names;
4624 static bool explained_incomplete_types = false;
4625 bool gave_void_only_once_err = false;
4627 /* Just "void" (and no ellipsis) is special. There are really no parms.
4628 But if the "void" is qualified (by "const" or "volatile"), or has a
4629 storage class specifier ("register"), then the behavior is undefined;
4630 issue an error. Typedefs for "void" are OK (see DR#157). */
4631 if (void_at_end && parms != 0
4632 && TREE_CHAIN (parms) == 0
4633 && VOID_TYPE_P (TREE_TYPE (parms))
4634 && !DECL_NAME (parms))
4636 if (TREE_THIS_VOLATILE (parms)
4637 || TREE_READONLY (parms)
4638 || DECL_REGISTER (parms))
4639 error ("\"void\" as only parameter may not be qualified");
4641 return tree_cons (0, 0, tree_cons (0, void_type_node, 0));
4644 /* Sanity check all of the parameter declarations. */
4645 for (decl = parms; decl; decl = TREE_CHAIN (decl))
4647 if (TREE_CODE (decl) != PARM_DECL)
4649 if (TREE_ASM_WRITTEN (decl))
4652 /* Since there is a prototype, args are passed in their
4653 declared types. The back end may override this. */
4654 type = TREE_TYPE (decl);
4655 DECL_ARG_TYPE (decl) = type;
4657 /* Check for (..., void, ...) and issue an error. */
4658 if (VOID_TYPE_P (type) && !DECL_NAME (decl) && !gave_void_only_once_err)
4660 error ("\"void\" must be the only parameter");
4661 gave_void_only_once_err = true;
4664 type = build_tree_list (0, type);
4666 last_type = &TREE_CHAIN (type);
4669 /* Check the list of non-parameter decls for any forward parm decls
4670 that never got real decls. */
4671 for (decl = others; decl; decl = TREE_CHAIN (decl))
4672 if (TREE_CODE (decl) == PARM_DECL)
4674 if (!TREE_ASM_WRITTEN (decl))
4677 error ("%Jparameter \"%D\" has just a forward declaration",
4681 /* Warn about any struct, union or enum tags defined within this
4682 list. The scope of such types is limited to this declaration,
4683 which is rarely if ever desirable (it's impossible to call such
4684 a function with type-correct arguments). */
4685 for (decl = tags; decl; decl = TREE_CHAIN (decl))
4687 enum tree_code code = TREE_CODE (TREE_VALUE (decl));
4688 const char *keyword;
4689 /* An anonymous union parm type is meaningful as a GNU extension.
4690 So don't warn for that. */
4691 if (code == UNION_TYPE && TREE_PURPOSE (decl) == 0 && !pedantic)
4694 /* The keyword should not be translated. */
4697 case RECORD_TYPE: keyword = "struct"; break;
4698 case UNION_TYPE: keyword = "union"; break;
4699 case ENUMERAL_TYPE: keyword = "enum"; break;
4703 if (TREE_PURPOSE (decl))
4704 /* The first %s will be one of 'struct', 'union', or 'enum'. */
4705 warning ("\"%s %s\" declared inside parameter list",
4706 keyword, IDENTIFIER_POINTER (TREE_PURPOSE (decl)));
4708 /* The %s will be one of 'struct', 'union', or 'enum'. */
4709 warning ("anonymous %s declared inside parameter list", keyword);
4711 if (! explained_incomplete_types)
4713 warning ("its scope is only this definition or declaration,"
4714 " which is probably not what you want");
4715 explained_incomplete_types = true;
4722 type = build_tree_list (0, void_type_node);
4726 list = tree_cons (parms, tags, types);
4727 TREE_TYPE (list) = others;
4731 /* Get the struct, enum or union (CODE says which) with tag NAME.
4732 Define the tag as a forward-reference if it is not defined. */
4735 xref_tag (enum tree_code code, tree name)
4737 /* If a cross reference is requested, look up the type
4738 already defined for this tag and return it. */
4740 tree ref = lookup_tag (code, name, 0);
4741 /* If this is the right type of tag, return what we found.
4742 (This reference will be shadowed by shadow_tag later if appropriate.)
4743 If this is the wrong type of tag, do not return it. If it was the
4744 wrong type in the same scope, we will have had an error
4745 message already; if in a different scope and declaring
4746 a name, pending_xref_error will give an error message; but if in a
4747 different scope and not declaring a name, this tag should
4748 shadow the previous declaration of a different type of tag, and
4749 this would not work properly if we return the reference found.
4750 (For example, with "struct foo" in an outer scope, "union foo;"
4751 must shadow that tag with a new one of union type.) */
4752 if (ref && TREE_CODE (ref) == code)
4755 /* If no such tag is yet defined, create a forward-reference node
4756 and record it as the "definition".
4757 When a real declaration of this type is found,
4758 the forward-reference will be altered into a real type. */
4760 ref = make_node (code);
4761 if (code == ENUMERAL_TYPE)
4763 /* Give the type a default layout like unsigned int
4764 to avoid crashing if it does not get defined. */
4765 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
4766 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
4767 TYPE_USER_ALIGN (ref) = 0;
4768 TREE_UNSIGNED (ref) = 1;
4769 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
4770 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
4771 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
4774 pushtag (name, ref);
4779 /* Make sure that the tag NAME is defined *in the current scope*
4780 at least as a forward reference.
4781 CODE says which kind of tag NAME ought to be. */
4784 start_struct (enum tree_code code, tree name)
4786 /* If there is already a tag defined at this scope
4787 (as a forward reference), just return it. */
4792 ref = lookup_tag (code, name, 1);
4793 if (ref && TREE_CODE (ref) == code)
4795 if (TYPE_FIELDS (ref))
4797 if (code == UNION_TYPE)
4798 error ("redefinition of `union %s'", IDENTIFIER_POINTER (name));
4800 error ("redefinition of `struct %s'", IDENTIFIER_POINTER (name));
4805 /* Otherwise create a forward-reference just so the tag is in scope. */
4807 ref = make_node (code);
4808 pushtag (name, ref);
4811 C_TYPE_BEING_DEFINED (ref) = 1;
4812 TYPE_PACKED (ref) = flag_pack_struct;
4816 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
4817 of a structure component, returning a FIELD_DECL node.
4818 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
4820 This is done during the parsing of the struct declaration.
4821 The FIELD_DECL nodes are chained together and the lot of them
4822 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
4825 grokfield (tree declarator, tree declspecs, tree width)
4829 if (declarator == NULL_TREE && width == NULL_TREE)
4831 /* This is an unnamed decl.
4833 If we have something of the form "union { list } ;" then this
4834 is the anonymous union extension. Similarly for struct.
4836 If this is something of the form "struct foo;", then
4837 If MS extensions are enabled, this is handled as an
4839 Otherwise this is a forward declaration of a structure tag.
4841 If this is something of the form "foo;" and foo is a TYPE_DECL, then
4842 If MS extensions are enabled and foo names a structure, then
4843 again this is an anonymous struct.
4844 Otherwise this is an error.
4846 Oh what a horrid tangled web we weave. I wonder if MS consciously
4847 took this from Plan 9 or if it was an accident of implementation
4848 that took root before someone noticed the bug... */
4850 tree type = TREE_VALUE (declspecs);
4852 if (flag_ms_extensions && TREE_CODE (type) == TYPE_DECL)
4853 type = TREE_TYPE (type);
4854 if (TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE)
4856 if (flag_ms_extensions)
4859 goto warn_unnamed_field;
4860 else if (TYPE_NAME (type) == NULL)
4863 goto warn_unnamed_field;
4868 warning ("declaration does not declare anything");
4873 value = grokdeclarator (declarator, declspecs, FIELD, 0,
4874 width ? &width : NULL);
4876 finish_decl (value, NULL_TREE, NULL_TREE);
4877 DECL_INITIAL (value) = width;
4882 /* Generate an error for any duplicate field names in FIELDLIST. Munge
4883 the list such that this does not present a problem later. */
4886 detect_field_duplicates (tree fieldlist)
4891 /* First, see if there are more than "a few" fields.
4892 This is trivially true if there are zero or one fields. */
4895 x = TREE_CHAIN (fieldlist);
4901 } while (timeout > 0 && x);
4903 /* If there were "few" fields, avoid the overhead of allocating
4904 a hash table. Instead just do the nested traversal thing. */
4907 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
4910 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
4911 if (DECL_NAME (y) == DECL_NAME (x))
4913 error ("%Jduplicate member '%D'", x, x);
4914 DECL_NAME (x) = NULL_TREE;
4920 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
4923 for (x = fieldlist; x ; x = TREE_CHAIN (x))
4924 if ((y = DECL_NAME (x)) != 0)
4926 slot = htab_find_slot (htab, y, INSERT);
4929 error ("%Jduplicate member '%D'", x, x);
4930 DECL_NAME (x) = NULL_TREE;
4939 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
4940 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
4941 ATTRIBUTES are attributes to be applied to the structure. */
4944 finish_struct (tree t, tree fieldlist, tree attributes)
4947 int toplevel = global_scope == current_scope;
4948 int saw_named_field;
4950 /* If this type was previously laid out as a forward reference,
4951 make sure we lay it out again. */
4955 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
4957 /* Nameless union parm types are useful as GCC extension. */
4958 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
4959 /* Otherwise, warn about any struct or union def. in parmlist. */
4960 if (in_parm_level_p ())
4963 pedwarn ("%s defined inside parms",
4964 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
4966 warning ("%s defined inside parms",
4967 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
4972 for (x = fieldlist; x; x = TREE_CHAIN (x))
4973 if (DECL_NAME (x) != 0)
4977 pedwarn ("%s has no %s",
4978 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
4979 fieldlist ? _("named members") : _("members"));
4982 /* Install struct as DECL_CONTEXT of each field decl.
4983 Also process specified field sizes,m which is found in the DECL_INITIAL.
4984 Store 0 there, except for ": 0" fields (so we can find them
4985 and delete them, below). */
4987 saw_named_field = 0;
4988 for (x = fieldlist; x; x = TREE_CHAIN (x))
4990 DECL_CONTEXT (x) = t;
4991 DECL_PACKED (x) |= TYPE_PACKED (t);
4993 /* If any field is const, the structure type is pseudo-const. */
4994 if (TREE_READONLY (x))
4995 C_TYPE_FIELDS_READONLY (t) = 1;
4998 /* A field that is pseudo-const makes the structure likewise. */
4999 tree t1 = TREE_TYPE (x);
5000 while (TREE_CODE (t1) == ARRAY_TYPE)
5001 t1 = TREE_TYPE (t1);
5002 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5003 && C_TYPE_FIELDS_READONLY (t1))
5004 C_TYPE_FIELDS_READONLY (t) = 1;
5007 /* Any field that is volatile means variables of this type must be
5008 treated in some ways as volatile. */
5009 if (TREE_THIS_VOLATILE (x))
5010 C_TYPE_FIELDS_VOLATILE (t) = 1;
5012 /* Any field of nominal variable size implies structure is too. */
5013 if (C_DECL_VARIABLE_SIZE (x))
5014 C_TYPE_VARIABLE_SIZE (t) = 1;
5016 /* Detect invalid nested redefinition. */
5017 if (TREE_TYPE (x) == t)
5018 error ("nested redefinition of `%s'",
5019 IDENTIFIER_POINTER (TYPE_NAME (t)));
5021 if (DECL_INITIAL (x))
5023 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
5024 DECL_SIZE (x) = bitsize_int (width);
5025 DECL_BIT_FIELD (x) = 1;
5026 SET_DECL_C_BIT_FIELD (x);
5029 DECL_INITIAL (x) = 0;
5031 /* Detect flexible array member in an invalid context. */
5032 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5033 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5034 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5035 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5037 if (TREE_CODE (t) == UNION_TYPE)
5038 error ("%Jflexible array member in union", x);
5039 else if (TREE_CHAIN (x) != NULL_TREE)
5040 error ("%Jflexible array member not at end of struct", x);
5041 else if (! saw_named_field)
5042 error ("%Jflexible array member in otherwise empty struct", x);
5045 if (pedantic && TREE_CODE (t) == RECORD_TYPE
5046 && flexible_array_type_p (TREE_TYPE (x)))
5047 pedwarn ("%Jinvalid use of structure with flexible array member", x);
5050 saw_named_field = 1;
5053 detect_field_duplicates (fieldlist);
5055 /* Now we have the nearly final fieldlist. Record it,
5056 then lay out the structure or union (including the fields). */
5058 TYPE_FIELDS (t) = fieldlist;
5062 /* Delete all zero-width bit-fields from the fieldlist. */
5064 tree *fieldlistp = &fieldlist;
5066 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5067 *fieldlistp = TREE_CHAIN (*fieldlistp);
5069 fieldlistp = &TREE_CHAIN (*fieldlistp);
5072 /* Now we have the truly final field list.
5073 Store it in this type and in the variants. */
5075 TYPE_FIELDS (t) = fieldlist;
5077 /* If there are lots of fields, sort so we can look through them fast.
5078 We arbitrarily consider 16 or more elts to be "a lot". */
5083 for (x = fieldlist; x; x = TREE_CHAIN (x))
5085 if (len > 15 || DECL_NAME (x) == NULL)
5093 struct lang_type *space;
5094 struct sorted_fields_type *space2;
5096 len += list_length (x);
5098 /* Use the same allocation policy here that make_node uses, to
5099 ensure that this lives as long as the rest of the struct decl.
5100 All decls in an inline function need to be saved. */
5102 space = ggc_alloc (sizeof (struct lang_type));
5103 space2 = ggc_alloc (sizeof (struct sorted_fields_type) + len * sizeof (tree));
5107 field_array = &space2->elts[0];
5108 for (x = fieldlist; x; x = TREE_CHAIN (x))
5110 field_array[len++] = x;
5112 /* If there is anonymous struct or union, break out of the loop. */
5113 if (DECL_NAME (x) == NULL)
5116 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5119 TYPE_LANG_SPECIFIC (t) = space;
5120 TYPE_LANG_SPECIFIC (t)->s->len = len;
5121 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5122 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5127 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5129 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5130 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5131 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5132 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5135 /* If this was supposed to be a transparent union, but we can't
5136 make it one, warn and turn off the flag. */
5137 if (TREE_CODE (t) == UNION_TYPE
5138 && TYPE_TRANSPARENT_UNION (t)
5139 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5141 TYPE_TRANSPARENT_UNION (t) = 0;
5142 warning ("union cannot be made transparent");
5145 /* If this structure or union completes the type of any previous
5146 variable declaration, lay it out and output its rtl. */
5147 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5151 tree decl = TREE_VALUE (x);
5152 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5153 layout_array_type (TREE_TYPE (decl));
5154 if (TREE_CODE (decl) != TYPE_DECL)
5156 layout_decl (decl, 0);
5157 if (c_dialect_objc ())
5158 objc_check_decl (decl);
5159 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5164 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5166 /* Finish debugging output for this type. */
5167 rest_of_type_compilation (t, toplevel);
5172 /* Lay out the type T, and its element type, and so on. */
5175 layout_array_type (tree t)
5177 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5178 layout_array_type (TREE_TYPE (t));
5182 /* Begin compiling the definition of an enumeration type.
5183 NAME is its name (or null if anonymous).
5184 Returns the type object, as yet incomplete.
5185 Also records info about it so that build_enumerator
5186 may be used to declare the individual values as they are read. */
5189 start_enum (tree name)
5193 /* If this is the real definition for a previous forward reference,
5194 fill in the contents in the same object that used to be the
5195 forward reference. */
5198 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5200 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5202 enumtype = make_node (ENUMERAL_TYPE);
5203 pushtag (name, enumtype);
5206 C_TYPE_BEING_DEFINED (enumtype) = 1;
5208 if (TYPE_VALUES (enumtype) != 0)
5210 /* This enum is a named one that has been declared already. */
5211 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5213 /* Completely replace its old definition.
5214 The old enumerators remain defined, however. */
5215 TYPE_VALUES (enumtype) = 0;
5218 enum_next_value = integer_zero_node;
5221 if (flag_short_enums)
5222 TYPE_PACKED (enumtype) = 1;
5227 /* After processing and defining all the values of an enumeration type,
5228 install their decls in the enumeration type and finish it off.
5229 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5230 and ATTRIBUTES are the specified attributes.
5231 Returns ENUMTYPE. */
5234 finish_enum (tree enumtype, tree values, tree attributes)
5237 tree minnode = 0, maxnode = 0, enum_value_type;
5238 int precision, unsign;
5239 int toplevel = (global_scope == current_scope);
5241 if (in_parm_level_p ())
5242 warning ("enum defined inside parms");
5244 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5246 /* Calculate the maximum value of any enumerator in this type. */
5248 if (values == error_mark_node)
5249 minnode = maxnode = integer_zero_node;
5252 minnode = maxnode = TREE_VALUE (values);
5253 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5255 tree value = TREE_VALUE (pair);
5256 if (tree_int_cst_lt (maxnode, value))
5258 if (tree_int_cst_lt (value, minnode))
5263 /* Construct the final type of this enumeration. It is the same
5264 as one of the integral types - the narrowest one that fits, except
5265 that normally we only go as narrow as int - and signed iff any of
5266 the values are negative. */
5267 unsign = (tree_int_cst_sgn (minnode) >= 0);
5268 precision = MAX (min_precision (minnode, unsign),
5269 min_precision (maxnode, unsign));
5270 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5272 tree narrowest = c_common_type_for_size (precision, unsign);
5275 warning ("enumeration values exceed range of largest integer");
5276 narrowest = long_long_integer_type_node;
5279 precision = TYPE_PRECISION (narrowest);
5282 precision = TYPE_PRECISION (integer_type_node);
5284 if (precision == TYPE_PRECISION (integer_type_node))
5285 enum_value_type = c_common_type_for_size (precision, 0);
5287 enum_value_type = enumtype;
5289 TYPE_MIN_VALUE (enumtype) = minnode;
5290 TYPE_MAX_VALUE (enumtype) = maxnode;
5291 TYPE_PRECISION (enumtype) = precision;
5292 TREE_UNSIGNED (enumtype) = unsign;
5293 TYPE_SIZE (enumtype) = 0;
5294 layout_type (enumtype);
5296 if (values != error_mark_node)
5298 /* Change the type of the enumerators to be the enum type. We
5299 need to do this irrespective of the size of the enum, for
5300 proper type checking. Replace the DECL_INITIALs of the
5301 enumerators, and the value slots of the list, with copies
5302 that have the enum type; they cannot be modified in place
5303 because they may be shared (e.g. integer_zero_node) Finally,
5304 change the purpose slots to point to the names of the decls. */
5305 for (pair = values; pair; pair = TREE_CHAIN (pair))
5307 tree enu = TREE_PURPOSE (pair);
5309 TREE_TYPE (enu) = enumtype;
5311 /* The ISO C Standard mandates enumerators to have type int,
5312 even though the underlying type of an enum type is
5313 unspecified. Here we convert any enumerators that fit in
5314 an int to type int, to avoid promotions to unsigned types
5315 when comparing integers with enumerators that fit in the
5316 int range. When -pedantic is given, build_enumerator()
5317 would have already taken care of those that don't fit. */
5318 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5319 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5321 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5323 TREE_PURPOSE (pair) = DECL_NAME (enu);
5324 TREE_VALUE (pair) = DECL_INITIAL (enu);
5327 TYPE_VALUES (enumtype) = values;
5330 /* Fix up all variant types of this enum type. */
5331 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5333 if (tem == enumtype)
5335 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5336 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5337 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5338 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5339 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5340 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5341 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5342 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5343 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5344 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5347 /* Finish debugging output for this type. */
5348 rest_of_type_compilation (enumtype, toplevel);
5353 /* Build and install a CONST_DECL for one value of the
5354 current enumeration type (one that was begun with start_enum).
5355 Return a tree-list containing the CONST_DECL and its value.
5356 Assignment of sequential values by default is handled here. */
5359 build_enumerator (tree name, tree value)
5363 /* Validate and default VALUE. */
5365 /* Remove no-op casts from the value. */
5367 STRIP_TYPE_NOPS (value);
5371 if (TREE_CODE (value) == INTEGER_CST)
5373 value = default_conversion (value);
5374 constant_expression_warning (value);
5378 error ("enumerator value for `%s' not integer constant",
5379 IDENTIFIER_POINTER (name));
5384 /* Default based on previous value. */
5385 /* It should no longer be possible to have NON_LVALUE_EXPR
5389 value = enum_next_value;
5391 error ("overflow in enumeration values");
5394 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5396 pedwarn ("ISO C restricts enumerator values to range of `int'");
5397 value = convert (integer_type_node, value);
5400 /* Set basis for default for next value. */
5401 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5402 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5404 /* Now create a declaration for the enum value name. */
5406 type = TREE_TYPE (value);
5407 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5408 TYPE_PRECISION (integer_type_node)),
5409 (TYPE_PRECISION (type)
5410 >= TYPE_PRECISION (integer_type_node)
5411 && TREE_UNSIGNED (type)));
5413 decl = build_decl (CONST_DECL, name, type);
5414 DECL_INITIAL (decl) = convert (type, value);
5417 return tree_cons (decl, value, NULL_TREE);
5421 /* Create the FUNCTION_DECL for a function definition.
5422 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5423 the declaration; they describe the function's name and the type it returns,
5424 but twisted together in a fashion that parallels the syntax of C.
5426 This function creates a binding context for the function body
5427 as well as setting up the FUNCTION_DECL in current_function_decl.
5429 Returns 1 on success. If the DECLARATOR is not suitable for a function
5430 (it defines a datum instead), we return 0, which tells
5431 yyparse to report a parse error. */
5434 start_function (tree declspecs, tree declarator, tree attributes)
5436 tree decl1, old_decl;
5438 int old_immediate_size_expand = immediate_size_expand;
5440 current_function_returns_value = 0; /* Assume, until we see it does. */
5441 current_function_returns_null = 0;
5442 current_function_returns_abnormally = 0;
5443 warn_about_return_type = 0;
5444 current_extern_inline = 0;
5445 c_in_iteration_stmt = 0;
5448 /* Don't expand any sizes in the return type of the function. */
5449 immediate_size_expand = 0;
5451 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, NULL);
5453 /* If the declarator is not suitable for a function definition,
5454 cause a syntax error. */
5457 immediate_size_expand = old_immediate_size_expand;
5461 decl_attributes (&decl1, attributes, 0);
5463 if (DECL_DECLARED_INLINE_P (decl1)
5464 && DECL_UNINLINABLE (decl1)
5465 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5466 warning ("%Jinline function '%D' given attribute noinline", decl1, decl1);
5468 announce_function (decl1);
5470 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5472 error ("return type is an incomplete type");
5473 /* Make it return void instead. */
5475 = build_function_type (void_type_node,
5476 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5479 if (warn_about_return_type)
5480 pedwarn_c99 ("return type defaults to `int'");
5482 /* Save the parm names or decls from this function's declarator
5483 where store_parm_decls will find them. */
5484 current_function_parms = last_function_parms;
5485 current_function_parm_tags = last_function_parm_tags;
5486 current_function_parm_others = last_function_parm_others;
5488 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5489 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5490 DECL_INITIAL (decl1) = error_mark_node;
5492 /* If this definition isn't a prototype and we had a prototype declaration
5493 before, copy the arg type info from that prototype.
5494 But not if what we had before was a builtin function. */
5495 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5496 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5497 && !DECL_BUILT_IN (old_decl)
5498 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5499 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5500 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5502 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5503 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
5506 /* Optionally warn of old-fashioned def with no previous prototype. */
5507 if (warn_strict_prototypes
5508 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5509 && C_DECL_ISNT_PROTOTYPE (old_decl))
5510 warning ("function declaration isn't a prototype");
5511 /* Optionally warn of any global def with no previous prototype. */
5512 else if (warn_missing_prototypes
5513 && TREE_PUBLIC (decl1)
5514 && ! MAIN_NAME_P (DECL_NAME (decl1))
5515 && C_DECL_ISNT_PROTOTYPE (old_decl))
5516 warning ("%Jno previous prototype for '%D'", decl1, decl1);
5517 /* Optionally warn of any def with no previous prototype
5518 if the function has already been used. */
5519 else if (warn_missing_prototypes
5520 && old_decl != 0 && TREE_USED (old_decl)
5521 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5522 warning ("%J'%D' was used with no prototype before its definition",
5524 /* Optionally warn of any global def with no previous declaration. */
5525 else if (warn_missing_declarations
5526 && TREE_PUBLIC (decl1)
5528 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5529 warning ("%Jno previous declaration for '%D'", decl1, decl1);
5530 /* Optionally warn of any def with no previous declaration
5531 if the function has already been used. */
5532 else if (warn_missing_declarations
5533 && old_decl != 0 && TREE_USED (old_decl)
5534 && C_DECL_IMPLICIT (old_decl))
5535 warning ("%J`%D' was used with no declaration before its definition",
5538 /* This is a definition, not a reference.
5539 So normally clear DECL_EXTERNAL.
5540 However, `extern inline' acts like a declaration
5541 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5542 DECL_EXTERNAL (decl1) = current_extern_inline;
5544 /* This function exists in static storage.
5545 (This does not mean `static' in the C sense!) */
5546 TREE_STATIC (decl1) = 1;
5548 /* A nested function is not global. */
5549 if (current_function_decl != 0)
5550 TREE_PUBLIC (decl1) = 0;
5552 #ifdef ENABLE_CHECKING
5553 /* This is the earliest point at which we might know the assembler
5554 name of the function. Thus, if it's set before this, die horribly. */
5555 if (DECL_ASSEMBLER_NAME_SET_P (decl1))
5559 /* If #pragma weak was used, mark the decl weak now. */
5560 if (current_scope == global_scope)
5561 maybe_apply_pragma_weak (decl1);
5563 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5564 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5569 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5570 != integer_type_node)
5571 pedwarn ("%Jreturn type of '%D' is not `int'", decl1, decl1);
5573 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5574 args = TREE_CHAIN (args))
5576 tree type = args ? TREE_VALUE (args) : 0;
5578 if (type == void_type_node)
5585 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5586 pedwarn ("%Jfirst argument of '%D' should be `int'",
5591 if (TREE_CODE (type) != POINTER_TYPE
5592 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5593 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5595 pedwarn ("%Jsecond argument of '%D' should be 'char **'",
5600 if (TREE_CODE (type) != POINTER_TYPE
5601 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5602 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5604 pedwarn ("%Jthird argument of '%D' should probably be "
5605 "'char **'", decl1, decl1);
5610 /* It is intentional that this message does not mention the third
5611 argument because it's only mentioned in an appendix of the
5613 if (argct > 0 && (argct < 2 || argct > 3))
5614 pedwarn ("%J'%D' takes only zero or two arguments", decl1, decl1);
5616 if (! TREE_PUBLIC (decl1))
5617 pedwarn ("%J'%D' is normally a non-static function", decl1, decl1);
5620 /* Record the decl so that the function name is defined.
5621 If we already have a decl for this name, and it is a FUNCTION_DECL,
5622 use the old decl. */
5624 current_function_decl = pushdecl (decl1);
5627 declare_parm_level ();
5629 make_decl_rtl (current_function_decl, NULL);
5631 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5632 /* Promote the value to int before returning it. */
5633 if (c_promoting_integer_type_p (restype))
5635 /* It retains unsignedness if not really getting wider. */
5636 if (TREE_UNSIGNED (restype)
5637 && (TYPE_PRECISION (restype)
5638 == TYPE_PRECISION (integer_type_node)))
5639 restype = unsigned_type_node;
5641 restype = integer_type_node;
5643 DECL_RESULT (current_function_decl)
5644 = build_decl (RESULT_DECL, NULL_TREE, restype);
5646 /* If this fcn was already referenced via a block-scope `extern' decl
5647 (or an implicit decl), propagate certain information about the usage. */
5648 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
5649 TREE_ADDRESSABLE (current_function_decl) = 1;
5651 immediate_size_expand = old_immediate_size_expand;
5653 start_fname_decls ();
5658 /* Subroutine of store_parm_decls which handles new-style function
5659 definitions (prototype format). The parms already have decls, so we
5660 need only record them as in effect and complain if any redundant
5661 old-style parm decls were written. */
5663 store_parm_decls_newstyle (void)
5666 tree fndecl = current_function_decl;
5667 tree parms = current_function_parms;
5668 tree tags = current_function_parm_tags;
5669 tree others = current_function_parm_others;
5671 if (current_scope->parms || current_scope->names || current_scope->tags)
5673 error ("%Jold-style parameter declarations in prototyped "
5674 "function definition", fndecl);
5676 /* Get rid of the old-style declarations. */
5681 /* Now make all the parameter declarations visible in the function body.
5682 We can bypass most of the grunt work of pushdecl. */
5683 for (last = 0, decl = parms; decl; last = decl, decl = TREE_CHAIN (decl))
5685 DECL_CONTEXT (decl) = current_function_decl;
5686 if (DECL_NAME (decl) == 0)
5687 error ("%Jparameter name omitted", decl);
5690 if (IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)))
5691 current_scope->shadowed
5692 = tree_cons (DECL_NAME (decl),
5693 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)),
5694 current_scope->shadowed);
5695 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)) = decl;
5698 current_scope->parms = parms;
5699 current_scope->parms_last = last;
5701 /* Record the parameter list in the function declaration. */
5702 DECL_ARGUMENTS (fndecl) = parms;
5704 /* Now make all the ancillary declarations visible, likewise. */
5705 for (last = 0, decl = others; decl; last = decl, decl = TREE_CHAIN (decl))
5707 DECL_CONTEXT (decl) = current_function_decl;
5708 if (DECL_NAME (decl)
5709 && TYPE_MAIN_VARIANT (TREE_TYPE (decl)) != void_type_node)
5711 if (IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)))
5712 current_scope->shadowed
5713 = tree_cons (DECL_NAME (decl),
5714 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)),
5715 current_scope->shadowed);
5716 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)) = decl;
5719 current_scope->names = others;
5720 current_scope->names_last = last;
5722 /* And all the tag declarations. */
5723 for (decl = tags; decl; decl = TREE_CHAIN (decl))
5724 if (TREE_PURPOSE (decl))
5726 if (IDENTIFIER_TAG_VALUE (TREE_PURPOSE (decl)))
5727 current_scope->shadowed_tags
5728 = tree_cons (TREE_PURPOSE (decl),
5729 IDENTIFIER_SYMBOL_VALUE (TREE_PURPOSE (decl)),
5730 current_scope->shadowed_tags);
5731 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (decl)) = TREE_VALUE (decl);
5733 current_scope->tags = tags;
5736 /* Subroutine of store_parm_decls which handles old-style function
5737 definitions (separate parameter list and declarations). */
5740 store_parm_decls_oldstyle (void)
5742 tree parm, decl, last;
5743 tree fndecl = current_function_decl;
5745 /* This is the identifier list from the function declarator. */
5746 tree parmids = current_function_parms;
5748 /* We use DECL_WEAK as a flag to show which parameters have been
5749 seen already, since it is not used on PARM_DECL. */
5750 #ifdef ENABLE_CHECKING
5751 for (parm = current_scope->parms; parm; parm = TREE_CHAIN (parm))
5752 if (DECL_WEAK (parm))
5756 /* Match each formal parameter name with its declaration. Save each
5757 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
5758 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
5760 if (TREE_VALUE (parm) == 0)
5762 error ("%Jparameter name missing from parameter list", fndecl);
5763 TREE_PURPOSE (parm) = 0;
5767 decl = IDENTIFIER_SYMBOL_VALUE (TREE_VALUE (parm));
5768 if (decl && DECL_CONTEXT (decl) == fndecl)
5770 /* If we got something other than a PARM_DECL it is an error. */
5771 if (TREE_CODE (decl) != PARM_DECL)
5772 error ("%J\"%D\" declared as a non-parameter", decl, decl);
5773 /* If the declaration is already marked, we have a duplicate
5774 name. Complain and ignore the duplicate. */
5775 else if (DECL_WEAK (decl))
5777 error ("%Jmultiple parameters named \"%D\"", decl, decl);
5778 TREE_PURPOSE (parm) = 0;
5781 /* If the declaration says "void", complain and turn it into
5783 else if (VOID_TYPE_P (TREE_TYPE (decl)))
5785 error ("%Jparameter \"%D\" declared void", decl, decl);
5786 TREE_TYPE (decl) = integer_type_node;
5787 DECL_ARG_TYPE (decl) = integer_type_node;
5788 layout_decl (decl, 0);
5791 /* If no declaration found, default to int. */
5794 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
5795 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
5796 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
5800 pedwarn ("%Jtype of \"%D\" defaults to \"int\"", decl, decl);
5801 else if (extra_warnings)
5802 warning ("%Jtype of \"%D\" defaults to \"int\"", decl, decl);
5805 TREE_PURPOSE (parm) = decl;
5806 DECL_WEAK (decl) = 1;
5809 /* Now examine the parms chain for incomplete declarations
5810 and declarations with no corresponding names. */
5812 for (parm = current_scope->parms; parm; parm = TREE_CHAIN (parm))
5814 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
5816 error ("%Jparameter \"%D\" has incomplete type", parm, parm);
5817 TREE_TYPE (parm) = error_mark_node;
5820 if (! DECL_WEAK (parm))
5822 error ("%Jdeclaration for parameter \"%D\" but no such parameter",
5825 /* Pretend the parameter was not missing.
5826 This gets us to a standard state and minimizes
5827 further error messages. */
5828 parmids = chainon (parmids, tree_cons (parm, 0, 0));
5832 /* Chain the declarations together in the order of the list of
5833 names. Store that chain in the function decl, replacing the
5834 list of names. Update the current scope to match. */
5835 DECL_ARGUMENTS (fndecl) = 0;
5837 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
5838 if (TREE_PURPOSE (parm))
5840 if (parm && TREE_PURPOSE (parm))
5842 last = TREE_PURPOSE (parm);
5843 DECL_ARGUMENTS (fndecl) = last;
5844 current_scope->parms = last;
5845 DECL_WEAK (last) = 0;
5847 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
5848 if (TREE_PURPOSE (parm))
5850 TREE_CHAIN (last) = TREE_PURPOSE (parm);
5851 last = TREE_PURPOSE (parm);
5852 DECL_WEAK (last) = 0;
5854 current_scope->parms_last = last;
5855 TREE_CHAIN (last) = 0;
5858 /* If there was a previous prototype,
5859 set the DECL_ARG_TYPE of each argument according to
5860 the type previously specified, and report any mismatches. */
5862 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
5865 for (parm = DECL_ARGUMENTS (fndecl),
5866 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
5867 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
5868 != void_type_node));
5869 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
5871 if (parm == 0 || type == 0
5872 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
5874 error ("number of arguments doesn't match prototype");
5875 error ("%Hprototype declaration",
5876 ¤t_function_prototype_locus);
5879 /* Type for passing arg must be consistent with that
5880 declared for the arg. ISO C says we take the unqualified
5881 type for parameters declared with qualified type. */
5882 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
5883 TYPE_MAIN_VARIANT (TREE_VALUE (type)),
5886 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
5887 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
5889 /* Adjust argument to match prototype. E.g. a previous
5890 `int foo(float);' prototype causes
5891 `int foo(x) float x; {...}' to be treated like
5892 `int foo(float x) {...}'. This is particularly
5893 useful for argument types like uid_t. */
5894 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
5896 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
5897 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
5898 && TYPE_PRECISION (TREE_TYPE (parm))
5899 < TYPE_PRECISION (integer_type_node))
5900 DECL_ARG_TYPE (parm) = integer_type_node;
5904 pedwarn ("promoted argument \"%D\" "
5905 "doesn't match prototype", parm);
5906 pedwarn ("%Hprototype declaration",
5907 ¤t_function_prototype_locus);
5912 error ("argument \"%D\" doesn't match prototype", parm);
5913 error ("%Hprototype declaration",
5914 ¤t_function_prototype_locus);
5918 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
5921 /* Otherwise, create a prototype that would match. */
5925 tree actual = 0, last = 0, type;
5927 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
5929 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
5931 TREE_CHAIN (last) = type;
5936 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
5938 TREE_CHAIN (last) = type;
5942 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
5943 of the type of this function, but we need to avoid having this
5944 affect the types of other similarly-typed functions, so we must
5945 first force the generation of an identical (but separate) type
5946 node for the relevant function type. The new node we create
5947 will be a variant of the main variant of the original function
5950 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
5952 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
5956 /* Store the parameter declarations into the current function declaration.
5957 This is called after parsing the parameter declarations, before
5958 digesting the body of the function.
5960 For an old-style definition, construct a prototype out of the old-style
5961 parameter declarations and inject it into the function's type. */
5964 store_parm_decls (void)
5966 tree fndecl = current_function_decl;
5968 /* The function containing FNDECL, if any. */
5969 tree context = decl_function_context (fndecl);
5971 /* True if this definition is written with a prototype. */
5972 bool prototype = (current_function_parms
5973 && TREE_CODE (current_function_parms) != TREE_LIST);
5976 store_parm_decls_newstyle ();
5978 store_parm_decls_oldstyle ();
5980 /* The next call to pushlevel will be a function body. */
5982 next_is_function_body = true;
5984 /* Write a record describing this function definition to the prototypes
5985 file (if requested). */
5987 gen_aux_info_record (fndecl, 1, 0, prototype);
5989 /* Initialize the RTL code for the function. */
5990 allocate_struct_function (fndecl);
5992 /* Begin the statement tree for this function. */
5993 begin_stmt_tree (&DECL_SAVED_TREE (fndecl));
5995 /* If this is a nested function, save away the sizes of any
5996 variable-size types so that we can expand them when generating
6002 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
6003 = nreverse (get_pending_sizes ());
6004 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
6007 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
6010 /* This function is being processed in whole-function mode. */
6011 cfun->x_whole_function_mode_p = 1;
6013 /* Even though we're inside a function body, we still don't want to
6014 call expand_expr to calculate the size of a variable-sized array.
6015 We haven't necessarily assigned RTL to all variables yet, so it's
6016 not safe to try to expand expressions involving them. */
6017 immediate_size_expand = 0;
6018 cfun->x_dont_save_pending_sizes_p = 1;
6021 /* Finish up a function declaration and compile that function
6022 all the way to assembler language output. The free the storage
6023 for the function definition.
6025 This is called after parsing the body of the function definition. */
6028 finish_function (void)
6030 tree fndecl = current_function_decl;
6032 /* When a function declaration is totally empty, e.g.
6034 (the argument list is irrelevant) the compstmt rule will not
6035 bother calling pushlevel/poplevel, which means we get here with
6036 the scope stack out of sync. Detect this situation by noticing
6037 that current_scope is still as store_parm_decls left it, and do
6038 a dummy push/pop to get back to consistency.
6039 Note that the call to pushlevel does not actually push another
6040 scope - see there for details. */
6042 if (current_scope->parm_flag && next_is_function_body)
6048 if (TREE_CODE (fndecl) == FUNCTION_DECL
6049 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6051 tree args = DECL_ARGUMENTS (fndecl);
6052 for (; args; args = TREE_CHAIN (args))
6054 tree type = TREE_TYPE (args);
6055 if (INTEGRAL_TYPE_P (type)
6056 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6057 DECL_ARG_TYPE (args) = integer_type_node;
6061 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6062 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6064 /* Must mark the RESULT_DECL as being in this function. */
6066 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
6067 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6069 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6071 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6072 != integer_type_node)
6074 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6075 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6077 pedwarn ("%Jreturn type of '%D' is not `int'", fndecl, fndecl);
6081 #ifdef DEFAULT_MAIN_RETURN
6082 /* Make it so that `main' always returns success by default. */
6083 DEFAULT_MAIN_RETURN;
6086 c_expand_return (integer_zero_node);
6091 finish_fname_decls ();
6093 /* Tie off the statement tree for this function. */
6094 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6096 /* Complain if there's just no return statement. */
6097 if (warn_return_type
6098 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6099 && !current_function_returns_value && !current_function_returns_null
6100 /* Don't complain if we abort. */
6101 && !current_function_returns_abnormally
6102 /* Don't warn for main(). */
6103 && !MAIN_NAME_P (DECL_NAME (fndecl))
6104 /* Or if they didn't actually specify a return type. */
6105 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6106 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6107 inline function, as we might never be compiled separately. */
6108 && DECL_INLINE (fndecl))
6109 warning ("no return statement in function returning non-void");
6111 /* With just -Wextra, complain only if function returns both with
6112 and without a value. */
6114 && current_function_returns_value
6115 && current_function_returns_null)
6116 warning ("this function may return with or without a value");
6118 /* We're leaving the context of this function, so zap cfun. It's still in
6119 DECL_SAVED_INSNS, and we'll restore it in tree_rest_of_compilation. */
6122 /* ??? Objc emits functions after finalizing the compilation unit.
6123 This should be cleaned up later and this conditional removed. */
6124 if (!cgraph_global_info_ready)
6125 cgraph_finalize_function (fndecl, false);
6127 c_expand_body (fndecl);
6128 current_function_decl = NULL;
6131 /* Generate the RTL for a deferred function FNDECL. */
6134 c_expand_deferred_function (tree fndecl)
6136 /* DECL_INLINE or DECL_RESULT might got cleared after the inline
6137 function was deferred, e.g. in duplicate_decls. */
6138 if (DECL_INLINE (fndecl) && DECL_RESULT (fndecl))
6140 if (flag_inline_trees)
6142 timevar_push (TV_INTEGRATION);
6143 optimize_inline_calls (fndecl);
6144 timevar_pop (TV_INTEGRATION);
6146 c_expand_body (fndecl);
6147 current_function_decl = NULL;
6151 /* Generate the RTL for the body of FNDECL. If NESTED_P is nonzero,
6152 then we are already in the process of generating RTL for another
6156 c_expand_body_1 (tree fndecl, int nested_p)
6160 /* Make sure that we will evaluate variable-sized types involved
6161 in our function's type. */
6162 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6164 /* Squirrel away our current state. */
6165 push_function_context ();
6168 tree_rest_of_compilation (fndecl, nested_p);
6171 /* Return to the enclosing function. */
6172 pop_function_context ();
6174 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6176 if (targetm.have_ctors_dtors)
6177 (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
6178 DEFAULT_INIT_PRIORITY);
6180 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6183 if (DECL_STATIC_DESTRUCTOR (fndecl))
6185 if (targetm.have_ctors_dtors)
6186 (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
6187 DEFAULT_INIT_PRIORITY);
6189 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6193 /* Like c_expand_body_1 but only for unnested functions. */
6196 c_expand_body (tree fndecl)
6199 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6200 c_expand_body_1 (fndecl, 0);
6203 /* Check the declarations given in a for-loop for satisfying the C99
6206 check_for_loop_decls (void)
6212 /* If we get here, declarations have been used in a for loop without
6213 the C99 for loop scope. This doesn't make much sense, so don't
6215 error ("'for' loop initial declaration used outside C99 mode");
6218 /* C99 subclause 6.8.5 paragraph 3:
6220 [#3] The declaration part of a for statement shall only
6221 declare identifiers for objects having storage class auto or
6224 It isn't clear whether, in this sentence, "identifiers" binds to
6225 "shall only declare" or to "objects" - that is, whether all identifiers
6226 declared must be identifiers for objects, or whether the restriction
6227 only applies to those that are. (A question on this in comp.std.c
6228 in November 2000 received no answer.) We implement the strictest
6229 interpretation, to avoid creating an extension which later causes
6232 for (t = current_scope->tags; t; t = TREE_CHAIN (t))
6234 if (TREE_PURPOSE (t) != 0)
6236 enum tree_code code = TREE_CODE (TREE_VALUE (t));
6238 if (code == RECORD_TYPE)
6239 error ("'struct %s' declared in 'for' loop initial declaration",
6240 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6241 else if (code == UNION_TYPE)
6242 error ("'union %s' declared in 'for' loop initial declaration",
6243 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6245 error ("'enum %s' declared in 'for' loop initial declaration",
6246 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6250 for (t = getdecls (); t; t = TREE_CHAIN (t))
6252 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
6253 error ("%Jdeclaration of non-variable '%D' in 'for' loop "
6254 "initial declaration", t, t);
6255 else if (TREE_STATIC (t))
6256 error ("%Jdeclaration of static variable '%D' in 'for' loop "
6257 "initial declaration", t, t);
6258 else if (DECL_EXTERNAL (t))
6259 error ("%Jdeclaration of 'extern' variable '%D' in 'for' loop "
6260 "initial declaration", t, t);
6264 /* Save and reinitialize the variables
6265 used during compilation of a C function. */
6268 c_push_function_context (struct function *f)
6270 struct language_function *p;
6271 p = ggc_alloc (sizeof (struct language_function));
6274 p->base.x_stmt_tree = c_stmt_tree;
6275 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
6276 p->x_in_iteration_stmt = c_in_iteration_stmt;
6277 p->x_in_case_stmt = c_in_case_stmt;
6278 p->returns_value = current_function_returns_value;
6279 p->returns_null = current_function_returns_null;
6280 p->returns_abnormally = current_function_returns_abnormally;
6281 p->warn_about_return_type = warn_about_return_type;
6282 p->extern_inline = current_extern_inline;
6285 /* Restore the variables used during compilation of a C function. */
6288 c_pop_function_context (struct function *f)
6290 struct language_function *p = f->language;
6292 if (DECL_SAVED_INSNS (current_function_decl) == 0
6293 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6295 /* Stop pointing to the local nodes about to be freed. */
6296 /* But DECL_INITIAL must remain nonzero so we know this
6297 was an actual function definition. */
6298 DECL_INITIAL (current_function_decl) = error_mark_node;
6299 DECL_ARGUMENTS (current_function_decl) = 0;
6302 c_stmt_tree = p->base.x_stmt_tree;
6303 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
6304 c_in_iteration_stmt = p->x_in_iteration_stmt;
6305 c_in_case_stmt = p->x_in_case_stmt;
6306 current_function_returns_value = p->returns_value;
6307 current_function_returns_null = p->returns_null;
6308 current_function_returns_abnormally = p->returns_abnormally;
6309 warn_about_return_type = p->warn_about_return_type;
6310 current_extern_inline = p->extern_inline;
6315 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6318 c_dup_lang_specific_decl (tree decl)
6320 struct lang_decl *ld;
6322 if (!DECL_LANG_SPECIFIC (decl))
6325 ld = ggc_alloc (sizeof (struct lang_decl));
6326 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6327 DECL_LANG_SPECIFIC (decl) = ld;
6330 /* The functions below are required for functionality of doing
6331 function at once processing in the C front end. Currently these
6332 functions are not called from anywhere in the C front end, but as
6333 these changes continue, that will change. */
6335 /* Returns nonzero if the current statement is a full expression,
6336 i.e. temporaries created during that statement should be destroyed
6337 at the end of the statement. */
6340 stmts_are_full_exprs_p (void)
6345 /* Returns the stmt_tree (if any) to which statements are currently
6346 being added. If there is no active statement-tree, NULL is
6350 current_stmt_tree (void)
6352 return &c_stmt_tree;
6355 /* Returns the stack of SCOPE_STMTs for the current function. */
6358 current_scope_stmt_stack (void)
6360 return &c_scope_stmt_stack;
6363 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6367 anon_aggr_type_p (tree node ATTRIBUTE_UNUSED)
6372 /* Dummy function in place of callback used by C++. */
6375 extract_interface_info (void)
6379 /* Return a new COMPOUND_STMT, after adding it to the current
6383 c_begin_compound_stmt (void)
6387 /* Create the COMPOUND_STMT. */
6388 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
6393 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
6397 c_expand_decl_stmt (tree t)
6399 tree decl = DECL_STMT_DECL (t);
6401 /* Expand nested functions. */
6402 if (TREE_CODE (decl) == FUNCTION_DECL
6403 && DECL_CONTEXT (decl) == current_function_decl
6404 && DECL_SAVED_TREE (decl))
6405 c_expand_body_1 (decl, 1);
6408 /* Return the global value of T as a symbol. */
6411 identifier_global_value (tree t)
6413 tree decl = IDENTIFIER_SYMBOL_VALUE (t);
6414 if (decl == 0 || DECL_FILE_SCOPE_P (decl))
6417 /* Shadowed by something else; find the true global value. */
6418 for (decl = global_scope->names; decl; decl = TREE_CHAIN (decl))
6419 if (DECL_NAME (decl) == t)
6422 /* Only local values for this decl. */
6426 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6427 otherwise the name is found in ridpointers from RID_INDEX. */
6430 record_builtin_type (enum rid rid_index, const char *name, tree type)
6434 id = ridpointers[(int) rid_index];
6436 id = get_identifier (name);
6437 pushdecl (build_decl (TYPE_DECL, id, type));
6440 /* Build the void_list_node (void_type_node having been created). */
6442 build_void_list_node (void)
6444 tree t = build_tree_list (NULL_TREE, void_type_node);
6448 /* Return something to represent absolute declarators containing a *.
6449 TARGET is the absolute declarator that the * contains.
6450 TYPE_QUALS_ATTRS is a list of modifiers such as const or volatile
6451 to apply to the pointer type, represented as identifiers, possible mixed
6454 We return an INDIRECT_REF whose "contents" are TARGET (inside a TREE_LIST,
6455 if attributes are present) and whose type is the modifier list. */
6458 make_pointer_declarator (tree type_quals_attrs, tree target)
6461 tree itarget = target;
6462 split_specs_attrs (type_quals_attrs, &quals, &attrs);
6463 if (attrs != NULL_TREE)
6464 itarget = tree_cons (attrs, target, NULL_TREE);
6465 return build1 (INDIRECT_REF, quals, itarget);
6468 /* A wrapper around lhd_set_decl_assembler_name that gives static
6469 variables their C names if they are at file scope and only one
6470 translation unit is being compiled, for backwards compatibility
6471 with certain bizarre assembler hacks (like crtstuff.c). */
6474 c_static_assembler_name (tree decl)
6476 if (num_in_fnames == 1
6477 && !TREE_PUBLIC (decl) && DECL_CONTEXT (decl)
6478 && TREE_CODE (DECL_CONTEXT (decl)) == TRANSLATION_UNIT_DECL)
6479 SET_DECL_ASSEMBLER_NAME (decl, DECL_NAME (decl));
6481 lhd_set_decl_assembler_name (decl);
6484 /* Hash and equality functions for link_hash_table: key off
6485 DECL_ASSEMBLER_NAME. */
6488 link_hash_hash (const void *x_p)
6491 return (hashval_t) (long)DECL_ASSEMBLER_NAME (x);
6495 link_hash_eq (const void *x1_p, const void *x2_p)
6497 tree x1 = (tree)x1_p;
6498 tree x2 = (tree)x2_p;
6499 return DECL_ASSEMBLER_NAME (x1) == DECL_ASSEMBLER_NAME (x2);
6502 /* Propagate information between definitions and uses between multiple
6503 translation units in TU_LIST based on linkage rules. */
6506 merge_translation_unit_decls (void)
6508 const tree tu_list = current_file_decl;
6511 htab_t link_hash_table;
6514 /* Create the BLOCK that poplevel would have created, but don't
6515 actually call poplevel since that's expensive. */
6516 block = make_node (BLOCK);
6517 BLOCK_VARS (block) = current_scope->names;
6518 TREE_USED (block) = 1;
6519 DECL_INITIAL (current_file_decl) = block;
6521 /* If only one translation unit seen, no copying necessary. */
6522 if (TREE_CHAIN (tu_list) == NULL_TREE)
6525 link_hash_table = htab_create (1021, link_hash_hash, link_hash_eq, NULL);
6527 /* Enter any actual definitions into the hash table. */
6528 for (tu = tu_list; tu; tu = TREE_CHAIN (tu))
6529 for (decl = BLOCK_VARS (DECL_INITIAL (tu)); decl; decl = TREE_CHAIN (decl))
6530 if (TREE_PUBLIC (decl) && ! DECL_EXTERNAL (decl))
6533 slot = htab_find_slot (link_hash_table, decl, INSERT);
6535 /* If we've already got a definition, work out which one is
6536 the real one, put it into the hash table, and make the
6537 other one DECL_EXTERNAL. This is important to avoid
6538 putting out two definitions of the same symbol in the
6542 tree old_decl = (tree) *slot;
6544 /* If this is weak or common or whatever, suppress it
6545 in favor of the other definition. */
6546 if (DECL_WEAK (decl))
6547 DECL_EXTERNAL (decl) = 1;
6548 else if (DECL_WEAK (old_decl) && ! DECL_WEAK (decl))
6549 DECL_EXTERNAL (old_decl) = 1;
6550 else if (DECL_COMMON (decl) || DECL_ONE_ONLY (decl))
6551 DECL_EXTERNAL (decl) = 1;
6552 else if (DECL_COMMON (old_decl) || DECL_ONE_ONLY (old_decl))
6553 DECL_EXTERNAL (old_decl) = 1;
6555 if (DECL_EXTERNAL (decl))
6557 DECL_INITIAL (decl) = NULL_TREE;
6558 DECL_COMMON (decl) = 0;
6559 DECL_ONE_ONLY (decl) = 0;
6560 DECL_WEAK (decl) = 0;
6562 else if (DECL_EXTERNAL (old_decl))
6564 DECL_INITIAL (old_decl) = NULL_TREE;
6565 DECL_COMMON (old_decl) = 0;
6566 DECL_ONE_ONLY (old_decl) = 0;
6567 DECL_WEAK (old_decl) = 0;
6572 error ("%Jredefinition of global '%D'", decl, decl);
6573 error ("%J'%D' previously defined here", old_decl, old_decl);
6580 /* Now insert the desired information from all the definitions
6581 into any plain declarations. */
6582 for (tu = tu_list; tu; tu = TREE_CHAIN (tu))
6583 for (decl = BLOCK_VARS (DECL_INITIAL (tu)); decl; decl = TREE_CHAIN (decl))
6584 if (TREE_PUBLIC (decl) && DECL_EXTERNAL (decl))
6587 global_decl = htab_find (link_hash_table, decl);
6592 /* Print any appropriate error messages, and partially merge
6594 (void) duplicate_decls (decl, global_decl, true, true);
6597 htab_delete (link_hash_table);
6600 /* Perform final processing on file-scope data. */
6603 c_write_global_declarations(void)
6607 for (link = current_file_decl; link; link = TREE_CHAIN (link))
6609 tree globals = BLOCK_VARS (DECL_INITIAL (link));
6610 int len = list_length (globals);
6611 tree *vec = xmalloc (sizeof (tree) * len);
6615 /* Process the decls in the order they were written. */
6617 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
6620 wrapup_global_declarations (vec, len);
6622 check_global_declarations (vec, len);
6629 /* Reset the parser's state in preparation for a new file. */
6632 c_reset_state (void)
6635 tree file_scope_decl;
6637 /* Pop the global scope. */
6638 if (current_scope != global_scope)
6639 current_scope = global_scope;
6640 file_scope_decl = current_file_decl;
6641 DECL_INITIAL (file_scope_decl) = poplevel (1, 0, 0);
6642 BLOCK_SUPERCONTEXT (DECL_INITIAL (file_scope_decl)) = file_scope_decl;
6643 truly_local_externals = NULL_TREE;
6645 /* Start a new global binding level. */
6647 global_scope = current_scope;
6648 current_file_decl = build_decl (TRANSLATION_UNIT_DECL, NULL, NULL);
6649 TREE_CHAIN (current_file_decl) = file_scope_decl;
6651 /* Reintroduce the builtin declarations. */
6652 for (link = first_builtin_decl;
6653 link != TREE_CHAIN (last_builtin_decl);
6654 link = TREE_CHAIN (link))
6655 pushdecl (copy_node (link));
6658 #include "gt-c-decl.h"