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)
842 tree newargs, oldargs;
845 /* ??? Elsewhere TYPE_MAIN_VARIANT is not used in this context. */
846 #define END_OF_ARGLIST(t) (TYPE_MAIN_VARIANT (t) == void_type_node)
848 oldargs = TYPE_ACTUAL_ARG_TYPES (oldtype);
849 newargs = TYPE_ARG_TYPES (newtype);
854 tree oldargtype = TREE_VALUE (oldargs);
855 tree newargtype = TREE_VALUE (newargs);
857 if (END_OF_ARGLIST (oldargtype) && END_OF_ARGLIST (newargtype))
860 /* Reaching the end of just one list means the two decls don't
861 agree on the number of arguments. */
862 if (END_OF_ARGLIST (oldargtype))
864 error ("%Jprototype for '%D' declares more arguments "
865 "than previous old-style definition", newdecl, newdecl);
868 else if (END_OF_ARGLIST (newargtype))
870 error ("%Jprototype for '%D' declares fewer arguments "
871 "than previous old-style definition", newdecl, newdecl);
875 /* Type for passing arg must be consistent with that declared
877 else if (! comptypes (oldargtype, newargtype, COMPARE_STRICT))
879 error ("%Jprototype for '%D' declares arg %d with incompatible type",
880 newdecl, newdecl, i);
884 oldargs = TREE_CHAIN (oldargs);
885 newargs = TREE_CHAIN (newargs);
889 /* If we get here, no errors were found, but do issue a warning
890 for this poor-style construct. */
891 warning ("%Jprototype for '%D' follows non-prototype definition",
894 #undef END_OF_ARGLIST
897 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
898 first in a pair of mismatched declarations, using the diagnostic
901 locate_old_decl (tree decl, void (*diag)(const char *, ...))
903 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
905 else if (DECL_INITIAL (decl))
906 diag (N_("%Jprevious definition of '%D' was here"), decl, decl);
907 else if (C_DECL_IMPLICIT (decl))
908 diag (N_("%Jprevious implicit declaration of '%D' was here"), decl, decl);
910 diag (N_("%Jprevious declaration of '%D' was here"), decl, decl);
913 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
914 Returns true if the caller should proceed to merge the two, false
915 if OLDDECL should simply be discarded. As a side effect, issues
916 all necessary diagnostics for invalid or poor-style combinations.
917 If it returns true, writes the types of NEWDECL and OLDDECL to
918 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
919 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
922 diagnose_mismatched_decls (tree newdecl, tree olddecl,
923 tree *newtypep, tree *oldtypep)
925 tree newtype, oldtype;
926 bool pedwarned = false;
929 /* If we have error_mark_node for either decl or type, just discard
930 the previous decl - we're in an error cascade already. */
931 if (olddecl == error_mark_node || newdecl == error_mark_node)
933 *oldtypep = oldtype = TREE_TYPE (olddecl);
934 *newtypep = newtype = TREE_TYPE (newdecl);
935 if (oldtype == error_mark_node || newtype == error_mark_node)
938 /* Two different categories of symbol altogether. This is an error
939 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
940 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
942 if (TREE_CODE (olddecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
944 error ("%J'%D' redeclared as different kind of symbol",
946 locate_old_decl (olddecl, error);
948 else if (TREE_PUBLIC (newdecl))
949 warning ("%Jbuilt-in function '%D' declared as non-function",
951 else if (warn_shadow)
952 warning ("%Jshadowing built-in function '%D'",
957 if (!comptypes (oldtype, newtype, COMPARE_STRICT))
959 if (TREE_CODE (olddecl) == FUNCTION_DECL && DECL_BUILT_IN (olddecl))
961 /* Accept harmless mismatch in function types.
962 This is for the ffs and fprintf builtins. */
963 tree trytype = match_builtin_function_types (newtype, oldtype);
965 if (trytype && comptypes (newtype, trytype, COMPARE_STRICT))
966 *oldtypep = oldtype = trytype;
969 /* If types don't match for a built-in, throw away the
970 built-in. No point in calling locate_old_decl here, it
971 won't print anything. */
972 warning ("%Jconflicting types for built-in function '%D'",
977 else if (TREE_CODE (olddecl) == FUNCTION_DECL
978 && DECL_SOURCE_LINE (olddecl) == 0)
980 /* A conflicting function declaration for a predeclared
981 function that isn't actually built in. Objective C uses
982 these. The new declaration silently overrides everything
983 but the volatility (i.e. noreturn) indication. See also
984 below. FIXME: Make Objective C use normal builtins. */
985 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
988 /* Permit void foo (...) to match int foo (...) if the latter is
989 the definition and implicit int was used. See
990 c-torture/compile/920625-2.c. */
991 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
992 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
993 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
994 && C_FUNCTION_IMPLICIT_INT (newdecl))
996 pedwarn ("%Jconflicting types for '%D'", newdecl, newdecl);
997 /* Make sure we keep void as the return type. */
998 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
999 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1004 error ("%Jconflicting types for '%D'", newdecl, newdecl);
1005 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
1006 locate_old_decl (olddecl, error);
1011 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1012 but silently ignore the redeclaration if either is in a system
1013 header. (Conflicting redeclarations were handled above.) */
1014 if (TREE_CODE (newdecl) == TYPE_DECL)
1016 if (DECL_IN_SYSTEM_HEADER (newdecl) || DECL_IN_SYSTEM_HEADER (olddecl))
1017 return true; /* allow OLDDECL to continue in use */
1019 error ("%Jredefinition of typedef '%D'", newdecl, newdecl);
1020 locate_old_decl (olddecl, error);
1024 /* Function declarations can either be 'static' or 'extern' (no
1025 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1026 can never conflict with each other on account of linkage (6.2.2p4).
1027 Multiple definitions are not allowed (6.9p3,5) but GCC permits
1028 two definitions if one is 'extern inline' and one is not. The non-
1029 extern-inline definition supersedes the extern-inline definition. */
1030 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1032 if (DECL_BUILT_IN (olddecl) && !TREE_PUBLIC (newdecl))
1034 /* If you declare a built-in function name as static, the
1035 built-in definition is overridden,
1036 but optionally warn this was a bad choice of name. */
1038 warning ("%Jshadowing built-in function '%D'", newdecl, newdecl);
1039 /* Discard the old built-in function. */
1043 if (DECL_INITIAL (newdecl))
1045 if (DECL_INITIAL (olddecl)
1046 && !(DECL_DECLARED_INLINE_P (olddecl)
1047 && DECL_EXTERNAL (olddecl)
1048 && !(DECL_DECLARED_INLINE_P (newdecl)
1049 && DECL_EXTERNAL (newdecl))))
1051 error ("%Jredefinition of '%D'", newdecl, newdecl);
1052 locate_old_decl (olddecl, error);
1056 /* If we have a prototype after an old-style function definition,
1057 the argument types must be checked specially. */
1058 else if (DECL_INITIAL (olddecl)
1059 && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype)
1060 && TYPE_ACTUAL_ARG_TYPES (oldtype)
1061 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
1063 locate_old_decl (olddecl, error);
1066 /* Mismatched non-static and static is considered poor style.
1067 We only diagnose static then non-static if -Wtraditional,
1068 because it is the most convenient way to get some effects
1069 (see e.g. what unwind-dw2-fde-glibc.c does to the definition
1070 of _Unwind_Find_FDE in unwind-dw2-fde.c). Revisit? */
1071 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
1073 /* A static function declaration for a predeclared function
1074 that isn't actually built in, silently overrides the
1075 default. Objective C uses these. See also above.
1076 FIXME: Make Objective C use normal builtins. */
1077 if (TREE_CODE (olddecl) == FUNCTION_DECL
1078 && DECL_SOURCE_LINE (olddecl) == 0)
1082 warning ("%Jstatic declaration of '%D' follows "
1083 "non-static declaration", newdecl, newdecl);
1087 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl)
1088 && warn_traditional)
1090 warning ("%Jnon-static declaration of '%D' follows "
1091 "static declaration", newdecl, newdecl);
1095 else if (TREE_CODE (newdecl) == VAR_DECL)
1097 /* Only variables can be thread-local, and all declarations must
1098 agree on this property. */
1099 if (DECL_THREAD_LOCAL (newdecl) != DECL_THREAD_LOCAL (olddecl))
1101 if (DECL_THREAD_LOCAL (newdecl))
1102 error ("%Jthread-local declaration of '%D' follows "
1103 "non-thread-local declaration", newdecl, newdecl);
1105 error ("%Jnon-thread-local declaration of '%D' follows "
1106 "thread-local declaration", newdecl, newdecl);
1108 locate_old_decl (olddecl, error);
1112 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1113 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
1115 error ("%Jredefinition of '%D'", newdecl, newdecl);
1116 locate_old_decl (olddecl, error);
1120 /* Objects declared at file scope: if at least one is 'extern',
1121 it's fine (6.2.2p4); otherwise the linkage must agree (6.2.2p7). */
1122 if (DECL_FILE_SCOPE_P (newdecl))
1124 if (!DECL_EXTERNAL (newdecl)
1125 && !DECL_EXTERNAL (olddecl)
1126 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
1128 if (TREE_PUBLIC (newdecl))
1129 error ("%Jnon-static declaration of '%D' follows "
1130 "static declaration", newdecl, newdecl);
1132 error ("%Jstatic declaration of '%D' follows "
1133 "non-static declaration", newdecl, newdecl);
1135 locate_old_decl (olddecl, error);
1139 /* Two objects with the same name declared at the same block
1140 scope must both be external references (6.7p3). */
1141 else if (DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl)
1142 && (!DECL_EXTERNAL (newdecl) || !DECL_EXTERNAL (olddecl)))
1144 if (DECL_EXTERNAL (newdecl))
1145 error ("%Jextern declaration of '%D' follows "
1146 "declaration with no linkage", newdecl, newdecl);
1147 else if (DECL_EXTERNAL (olddecl))
1148 error ("%Jdeclaration of '%D' with no linkage follows "
1149 "extern declaration", newdecl, newdecl);
1151 error ("%Jredeclaration of '%D' with no linkage",
1154 locate_old_decl (olddecl, error);
1160 /* All decls must agree on a non-default visibility. */
1161 if (DECL_VISIBILITY (newdecl) != VISIBILITY_DEFAULT
1162 && DECL_VISIBILITY (olddecl) != VISIBILITY_DEFAULT
1163 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1165 warning ("%Jredeclaration of '%D' with different visibility "
1166 "(old visibility preserved)", newdecl, newdecl);
1170 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1172 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
1173 if (DECL_DECLARED_INLINE_P (newdecl)
1174 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1176 warning ("%Jinline declaration of '%D' follows "
1177 "declaration with attribute noinline", newdecl, newdecl);
1180 else if (DECL_DECLARED_INLINE_P (olddecl)
1181 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1183 warning ("%Jdeclaration of '%D' with attribute noinline follows "
1184 "inline declaration ", newdecl, newdecl);
1188 /* Inline declaration after use or definition.
1189 ??? Should we still warn about this now we have unit-at-a-time
1190 mode and can get it right? */
1191 if (DECL_DECLARED_INLINE_P (newdecl) && !DECL_DECLARED_INLINE_P (olddecl))
1193 if (TREE_USED (olddecl))
1195 warning ("%J'%D' declared inline after being called",
1199 else if (DECL_INITIAL (olddecl))
1201 warning ("%J'%D' declared inline after its definition",
1209 /* These bits are only type qualifiers when applied to objects. */
1210 if (TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl))
1212 if (TREE_THIS_VOLATILE (newdecl))
1213 pedwarn ("%Jvolatile declaration of '%D' follows "
1214 "non-volatile declaration", newdecl, newdecl);
1216 pedwarn ("%Jnon-volatile declaration of '%D' follows "
1217 "volatile declaration", newdecl, newdecl);
1220 if (TREE_READONLY (newdecl) != TREE_READONLY (olddecl))
1222 if (TREE_READONLY (newdecl))
1223 pedwarn ("%Jconst declaration of '%D' follows "
1224 "non-const declaration", newdecl, newdecl);
1226 pedwarn ("%Jnon-const declaration of '%D' follows "
1227 "const declaration", newdecl, newdecl);
1232 /* Optional warning for completely redundant decls. */
1233 if (!warned && !pedwarned
1234 && warn_redundant_decls
1235 /* Don't warn about a function declaration followed by a
1237 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1238 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
1239 /* Don't warn about an extern followed by a definition. */
1240 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl)))
1242 warning ("%Jredundant redeclaration of '%D'", newdecl, newdecl);
1246 /* Report location of previous decl/defn in a consistent manner. */
1247 if (warned || pedwarned)
1248 locate_old_decl (olddecl, pedwarned ? pedwarn : warning);
1253 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1254 consistent with OLDDECL, but carries new information. Merge the
1255 new information into OLDDECL. This function issues no
1259 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
1261 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1262 && DECL_INITIAL (newdecl) != 0);
1264 /* For real parm decl following a forward decl, return 1 so old decl
1265 will be reused. Only allow this to happen once. */
1266 if (TREE_CODE (newdecl) == PARM_DECL
1267 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1269 TREE_ASM_WRITTEN (olddecl) = 0;
1273 DECL_ATTRIBUTES (newdecl)
1274 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1276 /* Merge the data types specified in the two decls. */
1278 = TREE_TYPE (olddecl)
1279 = common_type (newtype, oldtype);
1281 /* Lay the type out, unless already done. */
1282 if (oldtype != TREE_TYPE (newdecl))
1284 if (TREE_TYPE (newdecl) != error_mark_node)
1285 layout_type (TREE_TYPE (newdecl));
1286 if (TREE_CODE (newdecl) != FUNCTION_DECL
1287 && TREE_CODE (newdecl) != TYPE_DECL
1288 && TREE_CODE (newdecl) != CONST_DECL)
1289 layout_decl (newdecl, 0);
1293 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1294 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1295 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1296 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1297 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1298 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1300 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1301 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1305 /* Keep the old rtl since we can safely use it. */
1306 COPY_DECL_RTL (olddecl, newdecl);
1308 /* Merge the type qualifiers. */
1309 if (TREE_READONLY (newdecl))
1310 TREE_READONLY (olddecl) = 1;
1312 if (TREE_THIS_VOLATILE (newdecl))
1314 TREE_THIS_VOLATILE (olddecl) = 1;
1315 if (TREE_CODE (newdecl) == VAR_DECL)
1316 make_var_volatile (newdecl);
1319 /* Keep source location of definition rather than declaration. */
1320 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1321 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1323 /* Merge the unused-warning information. */
1324 if (DECL_IN_SYSTEM_HEADER (olddecl))
1325 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1326 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1327 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1329 /* Merge the initialization information. */
1330 if (DECL_INITIAL (newdecl) == 0)
1331 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1333 /* Merge the section attribute.
1334 We want to issue an error if the sections conflict but that must be
1335 done later in decl_attributes since we are called before attributes
1337 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1338 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1340 /* Copy the assembler name.
1341 Currently, it can only be defined in the prototype. */
1342 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1344 /* If either declaration has a nondefault visibility, use it. */
1345 if (DECL_VISIBILITY (olddecl) != VISIBILITY_DEFAULT)
1346 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1348 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1350 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1351 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1352 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1353 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1354 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1355 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1356 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1357 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1358 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1361 /* Merge the storage class information. */
1362 merge_weak (newdecl, olddecl);
1364 /* For functions, static overrides non-static. */
1365 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1367 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1368 /* This is since we don't automatically
1369 copy the attributes of NEWDECL into OLDDECL. */
1370 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1371 /* If this clears `static', clear it in the identifier too. */
1372 if (! TREE_PUBLIC (olddecl))
1373 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1375 if (DECL_EXTERNAL (newdecl))
1377 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1378 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1380 /* An extern decl does not override previous storage class. */
1381 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1382 if (! DECL_EXTERNAL (newdecl))
1384 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1385 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1390 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1391 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1394 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1396 /* If we're redefining a function previously defined as extern
1397 inline, make sure we emit debug info for the inline before we
1398 throw it away, in case it was inlined into a function that hasn't
1399 been written out yet. */
1400 if (new_is_definition && DECL_INITIAL (olddecl))
1402 if (TREE_USED (olddecl)
1403 /* In unit-at-a-time mode we never inline re-defined extern
1404 inline functions. */
1405 && !flag_unit_at_a_time
1406 && cgraph_function_possibly_inlined_p (olddecl))
1407 (*debug_hooks->outlining_inline_function) (olddecl);
1409 /* The new defn must not be inline. */
1410 DECL_INLINE (newdecl) = 0;
1411 DECL_UNINLINABLE (newdecl) = 1;
1415 /* If either decl says `inline', this fn is inline,
1416 unless its definition was passed already. */
1417 if (DECL_DECLARED_INLINE_P (newdecl)
1418 || DECL_DECLARED_INLINE_P (olddecl))
1419 DECL_DECLARED_INLINE_P (newdecl) = 1;
1421 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1422 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1425 if (DECL_BUILT_IN (olddecl))
1427 /* Get rid of any built-in function if we have a function
1429 if (new_is_definition)
1431 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1432 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
1436 /* If redeclaring a builtin function, and not a definition,
1437 it stays built in. */
1438 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1439 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1443 /* Also preserve various other info from the definition. */
1444 if (! new_is_definition)
1446 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1447 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1448 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1449 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1450 DECL_ESTIMATED_INSNS (newdecl) = DECL_ESTIMATED_INSNS (olddecl);
1451 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1453 /* Set DECL_INLINE on the declaration if we've got a body
1454 from which to instantiate. */
1455 if (DECL_INLINE (olddecl) && ! DECL_UNINLINABLE (newdecl))
1457 DECL_INLINE (newdecl) = 1;
1458 DECL_ABSTRACT_ORIGIN (newdecl)
1459 = DECL_ABSTRACT_ORIGIN (olddecl);
1464 /* If a previous declaration said inline, mark the
1465 definition as inlinable. */
1466 if (DECL_DECLARED_INLINE_P (newdecl)
1467 && ! DECL_UNINLINABLE (newdecl))
1468 DECL_INLINE (newdecl) = 1;
1472 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1473 But preserve OLDDECL's DECL_UID. */
1475 unsigned olddecl_uid = DECL_UID (olddecl);
1477 memcpy ((char *) olddecl + sizeof (struct tree_common),
1478 (char *) newdecl + sizeof (struct tree_common),
1479 sizeof (struct tree_decl) - sizeof (struct tree_common));
1480 DECL_UID (olddecl) = olddecl_uid;
1483 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1484 so that encode_section_info has a chance to look at the new decl
1485 flags and attributes. */
1486 if (DECL_RTL_SET_P (olddecl)
1487 && (TREE_CODE (olddecl) == FUNCTION_DECL
1488 || (TREE_CODE (olddecl) == VAR_DECL
1489 && TREE_STATIC (olddecl))))
1490 make_decl_rtl (olddecl, NULL);
1493 /* Handle when a new declaration NEWDECL has the same name as an old
1494 one OLDDECL in the same binding contour. Prints an error message
1497 If safely possible, alter OLDDECL to look like NEWDECL, and return
1498 true. Otherwise, return false. */
1501 duplicate_decls (tree newdecl, tree olddecl)
1503 tree newtype, oldtype;
1505 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
1508 merge_decls (newdecl, olddecl, newtype, oldtype);
1513 /* Return any external DECL associated with ID, whether or not it is
1514 currently in scope. */
1517 any_external_decl (tree id)
1519 tree decl = IDENTIFIER_SYMBOL_VALUE (id);
1522 if (decl == 0 || TREE_CODE (decl) == ERROR_MARK)
1524 else if (TREE_CODE (decl) != TYPE_DECL && DECL_EXTERNAL (decl))
1527 t = purpose_member (id, truly_local_externals);
1529 return TREE_VALUE (t);
1534 /* Record an external decl DECL. This only does something if a
1535 shadowing decl already exists. */
1537 record_external_decl (tree decl)
1539 tree name = DECL_NAME (decl);
1540 if (!IDENTIFIER_SYMBOL_VALUE (name))
1543 truly_local_externals = tree_cons (name, decl, truly_local_externals);
1546 /* Check whether decl-node X shadows an existing declaration.
1547 OLD is the old IDENTIFIER_SYMBOL_VALUE of the DECL_NAME of X,
1548 which might be a NULL_TREE. */
1550 warn_if_shadowing (tree x, tree old)
1554 /* Nothing to shadow? */
1556 /* Shadow warnings not wanted? */
1558 /* No shadow warnings for internally generated vars. */
1559 || DECL_SOURCE_LINE (x) == 0
1560 /* No shadow warnings for vars made for inlining. */
1561 || DECL_FROM_INLINE (x)
1562 /* Don't warn about the parm names in function declarator
1563 within a function declarator.
1564 It would be nice to avoid warning in any function
1565 declarator in a declaration, as opposed to a definition,
1566 but there is no way to tell it's not a definition. */
1567 || (TREE_CODE (x) == PARM_DECL && current_scope->outer->parm_flag))
1570 name = IDENTIFIER_POINTER (DECL_NAME (x));
1571 if (TREE_CODE (old) == PARM_DECL)
1572 shadow_warning (SW_PARAM, name, old);
1573 else if (DECL_FILE_SCOPE_P (old))
1574 shadow_warning (SW_GLOBAL, name, old);
1576 shadow_warning (SW_LOCAL, name, old);
1580 /* Subroutine of pushdecl.
1582 X is a TYPE_DECL for a typedef statement. Create a brand new
1583 ..._TYPE node (which will be just a variant of the existing
1584 ..._TYPE node with identical properties) and then install X
1585 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1587 The whole point here is to end up with a situation where each
1588 and every ..._TYPE node the compiler creates will be uniquely
1589 associated with AT MOST one node representing a typedef name.
1590 This way, even though the compiler substitutes corresponding
1591 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1592 early on, later parts of the compiler can always do the reverse
1593 translation and get back the corresponding typedef name. For
1596 typedef struct S MY_TYPE;
1599 Later parts of the compiler might only know that `object' was of
1600 type `struct S' if it were not for code just below. With this
1601 code however, later parts of the compiler see something like:
1603 struct S' == struct S
1604 typedef struct S' MY_TYPE;
1607 And they can then deduce (from the node for type struct S') that
1608 the original object declaration was:
1612 Being able to do this is important for proper support of protoize,
1613 and also for generating precise symbolic debugging information
1614 which takes full account of the programmer's (typedef) vocabulary.
1616 Obviously, we don't want to generate a duplicate ..._TYPE node if
1617 the TYPE_DECL node that we are now processing really represents a
1618 standard built-in type.
1620 Since all standard types are effectively declared at line zero
1621 in the source file, we can easily check to see if we are working
1622 on a standard type by checking the current value of lineno. */
1625 clone_underlying_type (tree x)
1627 if (DECL_SOURCE_LINE (x) == 0)
1629 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1630 TYPE_NAME (TREE_TYPE (x)) = x;
1632 else if (TREE_TYPE (x) != error_mark_node
1633 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
1635 tree tt = TREE_TYPE (x);
1636 DECL_ORIGINAL_TYPE (x) = tt;
1637 tt = build_type_copy (tt);
1639 TREE_USED (tt) = TREE_USED (x);
1644 /* Record a decl-node X as belonging to the current lexical scope.
1645 Check for errors (such as an incompatible declaration for the same
1646 name already seen in the same scope).
1648 Returns either X or an old decl for the same name.
1649 If an old decl is returned, it may have been smashed
1650 to agree with what X says. */
1655 tree name = DECL_NAME (x);
1656 struct c_scope *scope = current_scope;
1658 #ifdef ENABLE_CHECKING
1659 if (error_mark_node == 0)
1660 /* Called too early. */
1664 /* Functions need the lang_decl data. */
1665 if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
1666 DECL_LANG_SPECIFIC (x) = ggc_alloc_cleared (sizeof (struct lang_decl));
1668 /* A local extern declaration for a function doesn't constitute nesting.
1669 A local auto declaration does, since it's a forward decl
1670 for a nested function coming later. */
1671 if (current_function_decl == NULL
1672 || ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
1673 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x)))
1674 DECL_CONTEXT (x) = current_file_decl;
1676 DECL_CONTEXT (x) = current_function_decl;
1682 if (warn_nested_externs
1683 && scope != global_scope
1684 && DECL_EXTERNAL (x)
1685 && !DECL_IN_SYSTEM_HEADER (x))
1686 warning ("nested extern declaration of `%s'",
1687 IDENTIFIER_POINTER (name));
1689 old = lookup_name_current_level (name);
1690 if (old && duplicate_decls (x, old))
1692 /* For PARM_DECLs, old may be a forward declaration.
1693 If so, we want to remove it from its old location
1694 (in the variables chain) and rechain it in the
1695 location given by the new declaration. */
1696 if (TREE_CODE (x) == PARM_DECL)
1699 for (p = &scope->names; *p; p = &TREE_CHAIN (*p))
1702 *p = TREE_CHAIN (old);
1703 SCOPE_LIST_APPEND (scope, parms, old);
1709 if (DECL_EXTERNAL (x) || scope == global_scope)
1711 /* Find and check against a previous, not-in-scope, external
1712 decl for this identifier. (C99 6.2.7p2: All declarations
1713 that refer to the same object or function shall have
1714 compatible type; otherwise, the behavior is undefined.) */
1715 tree ext = any_external_decl (name);
1718 if (duplicate_decls (x, ext))
1719 x = copy_node (ext);
1722 record_external_decl (x);
1725 if (TREE_CODE (x) == TYPE_DECL)
1726 clone_underlying_type (x);
1728 /* If storing a local value, there may already be one
1729 (inherited). If so, record it for restoration when this
1730 scope ends. Take care not to do this if we are replacing an
1731 older decl in the same scope (i.e. duplicate_decls returned
1733 if (scope != global_scope
1734 && IDENTIFIER_SYMBOL_VALUE (name)
1735 && IDENTIFIER_SYMBOL_VALUE (name) != old)
1737 warn_if_shadowing (x, IDENTIFIER_SYMBOL_VALUE (name));
1738 scope->shadowed = tree_cons (name, IDENTIFIER_SYMBOL_VALUE (name),
1742 /* Install the new declaration in the requested scope. */
1743 IDENTIFIER_SYMBOL_VALUE (name) = x;
1744 C_DECL_INVISIBLE (x) = 0;
1746 /* If x's type is incomplete because it's based on a
1747 structure or union which has not yet been fully declared,
1748 attach it to that structure or union type, so we can go
1749 back and complete the variable declaration later, if the
1750 structure or union gets fully declared.
1752 If the input is erroneous, we can have error_mark in the type
1753 slot (e.g. "f(void a, ...)") - that doesn't count as an
1755 if (TREE_TYPE (x) != error_mark_node
1756 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
1758 tree element = TREE_TYPE (x);
1760 while (TREE_CODE (element) == ARRAY_TYPE)
1761 element = TREE_TYPE (element);
1762 element = TYPE_MAIN_VARIANT (element);
1764 if ((TREE_CODE (element) == RECORD_TYPE
1765 || TREE_CODE (element) == UNION_TYPE)
1766 && (TREE_CODE (x) != TYPE_DECL
1767 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
1768 && !COMPLETE_TYPE_P (element))
1769 C_TYPE_INCOMPLETE_VARS (element)
1770 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
1774 if (TREE_CODE (x) == PARM_DECL)
1775 SCOPE_LIST_APPEND (scope, parms, x);
1777 SCOPE_LIST_APPEND (scope, names, x);
1782 /* Record X as belonging to the global scope (C99 "file scope").
1783 This is used only internally by the Objective-C front end,
1784 and is limited to its needs. duplicate_decls is not called;
1785 if there is any preexisting decl for this identifier, it is an ICE. */
1788 pushdecl_top_level (tree x)
1792 if (TREE_CODE (x) != VAR_DECL)
1795 name = DECL_NAME (x);
1797 if (IDENTIFIER_SYMBOL_VALUE (name))
1800 DECL_CONTEXT (x) = current_file_decl;
1801 IDENTIFIER_SYMBOL_VALUE (name) = x;
1803 SCOPE_LIST_APPEND (global_scope, names, x);
1807 /* Generate an implicit declaration for identifier FUNCTIONID as a
1808 function of type int (). */
1811 implicitly_declare (tree functionid)
1813 tree decl = any_external_decl (functionid);
1817 /* Implicit declaration of a function already declared
1818 (somehow) in a different scope, or as a built-in.
1819 If this is the first time this has happened, warn;
1820 then recycle the old declaration. */
1821 if (!C_DECL_IMPLICIT (decl))
1823 implicit_decl_warning (DECL_NAME (decl));
1824 if (! DECL_FILE_SCOPE_P (decl))
1825 warning ("%Jprevious declaration of '%D'", decl, decl);
1826 C_DECL_IMPLICIT (decl) = 1;
1828 /* If this function is global, then it must already be in the
1829 global scope, so there's no need to push it again. */
1830 if (current_scope == global_scope)
1832 /* If this is a local declaration, make a copy; we can't have
1833 the same DECL listed in two different scopes. */
1834 return pushdecl (copy_node (decl));
1837 /* Not seen before. */
1838 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
1839 DECL_EXTERNAL (decl) = 1;
1840 TREE_PUBLIC (decl) = 1;
1841 C_DECL_IMPLICIT (decl) = 1;
1842 implicit_decl_warning (functionid);
1844 /* C89 says implicit declarations are in the innermost block.
1845 So we record the decl in the standard fashion. */
1846 decl = pushdecl (decl);
1848 /* No need to call objc_check_decl here - it's a function type. */
1849 rest_of_decl_compilation (decl, NULL, 0, 0);
1851 /* Write a record describing this implicit function declaration
1852 to the prototypes file (if requested). */
1853 gen_aux_info_record (decl, 0, 1, 0);
1855 /* Possibly apply some default attributes to this implicit declaration. */
1856 decl_attributes (&decl, NULL_TREE, 0);
1862 implicit_decl_warning (tree id)
1864 const char *name = IDENTIFIER_POINTER (id);
1865 if (mesg_implicit_function_declaration == 2)
1866 error ("implicit declaration of function `%s'", name);
1867 else if (mesg_implicit_function_declaration == 1)
1868 warning ("implicit declaration of function `%s'", name);
1871 /* Issue an error message for a reference to an undeclared variable
1872 ID, including a reference to a builtin outside of function-call
1873 context. Establish a binding of the identifier to error_mark_node
1874 in an appropriate scope, which will suppress further errors for the
1877 undeclared_variable (tree id)
1879 static bool already = false;
1880 struct c_scope *scope;
1882 if (current_function_decl == 0)
1884 error ("`%s' undeclared here (not in a function)",
1885 IDENTIFIER_POINTER (id));
1886 scope = current_scope;
1890 error ("`%s' undeclared (first use in this function)",
1891 IDENTIFIER_POINTER (id));
1895 error ("(Each undeclared identifier is reported only once");
1896 error ("for each function it appears in.)");
1900 scope = current_function_scope;
1903 scope->shadowed = tree_cons (id, IDENTIFIER_SYMBOL_VALUE (id),
1905 IDENTIFIER_SYMBOL_VALUE (id) = error_mark_node;
1908 /* Subroutine of lookup_label, declare_label, define_label: construct a
1909 LABEL_DECL with all the proper frills. */
1912 make_label (tree name, location_t location)
1914 tree label = build_decl (LABEL_DECL, name, void_type_node);
1916 DECL_CONTEXT (label) = current_function_decl;
1917 DECL_MODE (label) = VOIDmode;
1918 DECL_SOURCE_LOCATION (label) = location;
1923 /* Another subroutine of lookup_label, declare_label, define_label:
1924 set up the binding of name to LABEL_DECL in the given SCOPE. */
1927 bind_label (tree name, tree label, struct c_scope *scope)
1929 if (IDENTIFIER_LABEL_VALUE (name))
1930 scope->shadowed = tree_cons (name, IDENTIFIER_LABEL_VALUE (name),
1932 IDENTIFIER_LABEL_VALUE (name) = label;
1934 SCOPE_LIST_APPEND (scope, names, label);
1937 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
1938 Create one if none exists so far for the current function.
1939 This is called when a label is used in a goto expression or
1940 has its address taken. */
1943 lookup_label (tree name)
1947 if (current_function_decl == 0)
1949 error ("label %s referenced outside of any function",
1950 IDENTIFIER_POINTER (name));
1954 /* Use a label already defined or ref'd with this name, but not if
1955 it is inherited from a containing function and wasn't declared
1957 label = IDENTIFIER_LABEL_VALUE (name);
1958 if (label && (DECL_CONTEXT (label) == current_function_decl
1959 || C_DECLARED_LABEL_FLAG (label)))
1961 /* If the label has only been declared, update its apparent
1962 location to point here, for better diagnostics if it
1963 turns out not to have been defined. */
1964 if (!TREE_USED (label))
1965 DECL_SOURCE_LOCATION (label) = input_location;
1969 /* No label binding for that identifier; make one. */
1970 label = make_label (name, input_location);
1972 /* Ordinary labels go in the current function scope. */
1973 bind_label (name, label, current_function_scope);
1977 /* Make a label named NAME in the current function, shadowing silently
1978 any that may be inherited from containing functions or containing
1979 scopes. This is called for __label__ declarations. */
1981 /* Note that valid use, if the label being shadowed comes from another
1982 scope in the same function, requires calling declare_nonlocal_label
1983 right away. (Is this still true? -zw 2003-07-17) */
1986 declare_label (tree name)
1988 tree label = IDENTIFIER_LABEL_VALUE (name);
1991 /* Check to make sure that the label hasn't already been declared
1993 for (dup = current_scope->names; dup; dup = TREE_CHAIN (dup))
1996 error ("duplicate label declaration `%s'", IDENTIFIER_POINTER (name));
1997 error ("%Jthis is a previous declaration", dup);
1999 /* Just use the previous declaration. */
2003 label = make_label (name, input_location);
2004 C_DECLARED_LABEL_FLAG (label) = 1;
2006 /* Declared labels go in the current scope. */
2007 bind_label (name, label, current_scope);
2011 /* Define a label, specifying the location in the source file.
2012 Return the LABEL_DECL node for the label, if the definition is valid.
2013 Otherwise return 0. */
2016 define_label (location_t location, tree name)
2020 /* Find any preexisting label with this name. It is an error
2021 if that label has already been defined in this function, or
2022 if there is a containing function with a declared label with
2024 label = IDENTIFIER_LABEL_VALUE (name);
2027 && ((DECL_CONTEXT (label) == current_function_decl
2028 && DECL_INITIAL (label) != 0)
2029 || (DECL_CONTEXT (label) != current_function_decl
2030 && C_DECLARED_LABEL_FLAG (label))))
2032 error ("%Hduplicate label `%D'", &location, label);
2033 if (DECL_INITIAL (label))
2034 error ("%J`%D' previously defined here", label, label);
2036 error ("%J`%D' previously declared here", label, label);
2039 else if (label && DECL_CONTEXT (label) == current_function_decl)
2041 /* The label has been used or declared already in this function,
2042 but not defined. Update its location to point to this
2044 DECL_SOURCE_LOCATION (label) = location;
2048 /* No label binding for that identifier; make one. */
2049 label = make_label (name, location);
2051 /* Ordinary labels go in the current function scope. */
2052 bind_label (name, label, current_function_scope);
2055 if (warn_traditional && !in_system_header && lookup_name (name))
2056 warning ("%Htraditional C lacks a separate namespace for labels, "
2057 "identifier `%s' conflicts", &location,
2058 IDENTIFIER_POINTER (name));
2060 /* Mark label as having been defined. */
2061 DECL_INITIAL (label) = error_mark_node;
2065 /* Return the list of declarations of the current scope. */
2070 return current_scope->names;
2074 /* Given NAME, an IDENTIFIER_NODE,
2075 return the structure (or union or enum) definition for that name.
2076 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2077 CODE says which kind of type the caller wants;
2078 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2079 If the wrong kind of type is found, an error is reported. */
2082 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2084 tree tag = IDENTIFIER_TAG_VALUE (name);
2090 /* We only care about whether it's in this level if
2091 thislevel_only was set or it might be a type clash. */
2092 if (thislevel_only || TREE_CODE (tag) != code)
2094 if (current_scope == global_scope
2095 || purpose_member (name, current_scope->tags))
2099 if (thislevel_only && !thislevel)
2102 if (TREE_CODE (tag) != code)
2104 /* Definition isn't the kind we were looking for. */
2105 pending_invalid_xref = name;
2106 pending_invalid_xref_location = input_location;
2108 /* If in the same binding level as a declaration as a tag
2109 of a different type, this must not be allowed to
2110 shadow that tag, so give the error immediately.
2111 (For example, "struct foo; union foo;" is invalid.) */
2113 pending_xref_error ();
2118 /* Print an error message now
2119 for a recent invalid struct, union or enum cross reference.
2120 We don't print them immediately because they are not invalid
2121 when used in the `struct foo;' construct for shadowing. */
2124 pending_xref_error (void)
2126 if (pending_invalid_xref != 0)
2127 error ("%H`%s' defined as wrong kind of tag",
2128 &pending_invalid_xref_location,
2129 IDENTIFIER_POINTER (pending_invalid_xref));
2130 pending_invalid_xref = 0;
2134 /* Look up NAME in the current scope and its superiors
2135 in the namespace of variables, functions and typedefs.
2136 Return a ..._DECL node of some kind representing its definition,
2137 or return 0 if it is undefined. */
2140 lookup_name (tree name)
2142 tree decl = IDENTIFIER_SYMBOL_VALUE (name);
2143 if (decl == 0 || decl == error_mark_node)
2145 if (C_DECL_INVISIBLE (decl))
2150 /* Similar to `lookup_name' but look only at the current scope. */
2153 lookup_name_current_level (tree name)
2155 tree decl = IDENTIFIER_SYMBOL_VALUE (name);
2157 if (decl == 0 || decl == error_mark_node || C_DECL_INVISIBLE (decl))
2160 if (current_scope == global_scope)
2163 /* Scan the current scope for a decl with name NAME.
2164 For PARM_DECLs, we have to look at both ->parms and ->names, since
2165 forward parameter declarations wind up on the ->names list. */
2166 if (TREE_CODE (decl) == PARM_DECL
2167 && chain_member (decl, current_scope->parms))
2169 if (chain_member (decl, current_scope->names))
2175 /* Create the predefined scalar types of C,
2176 and some nodes representing standard constants (0, 1, (void *) 0).
2177 Initialize the global scope.
2178 Make definitions for built-in primitive functions. */
2181 c_init_decl_processing (void)
2184 tree ptr_ftype_void, ptr_ftype_ptr;
2185 location_t save_loc = input_location;
2187 /* Adds some ggc roots, and reserved words for c-parse.in. */
2190 current_function_decl = 0;
2192 /* Make the c_scope structure for global names. */
2194 global_scope = current_scope;
2196 /* Declarations from c_common_nodes_and_builtins must not be associated
2197 with this input file, lest we get differences between using and not
2198 using preprocessed headers. */
2199 input_location.file = "<internal>";
2200 input_location.line = 0;
2202 /* Make the DECL for the toplevel file scope. */
2203 current_file_decl = build_decl (TRANSLATION_UNIT_DECL, NULL, NULL);
2205 build_common_tree_nodes (flag_signed_char);
2207 c_common_nodes_and_builtins ();
2209 /* In C, comparisons and TRUTH_* expressions have type int. */
2210 truthvalue_type_node = integer_type_node;
2211 truthvalue_true_node = integer_one_node;
2212 truthvalue_false_node = integer_zero_node;
2214 /* Even in C99, which has a real boolean type. */
2215 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2216 boolean_type_node));
2218 endlink = void_list_node;
2219 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
2221 = build_function_type (ptr_type_node,
2222 tree_cons (NULL_TREE, ptr_type_node, endlink));
2224 input_location = save_loc;
2226 pedantic_lvalues = true;
2228 make_fname_decl = c_make_fname_decl;
2229 start_fname_decls ();
2231 first_builtin_decl = global_scope->names;
2232 last_builtin_decl = global_scope->names_last;
2235 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2236 decl, NAME is the initialization string and TYPE_DEP indicates whether
2237 NAME depended on the type of the function. As we don't yet implement
2238 delayed emission of static data, we mark the decl as emitted
2239 so it is not placed in the output. Anything using it must therefore pull
2240 out the STRING_CST initializer directly. FIXME. */
2243 c_make_fname_decl (tree id, int type_dep)
2245 const char *name = fname_as_string (type_dep);
2246 tree decl, type, init;
2247 size_t length = strlen (name);
2249 type = build_array_type
2250 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
2251 build_index_type (size_int (length)));
2253 decl = build_decl (VAR_DECL, id, type);
2255 TREE_STATIC (decl) = 1;
2256 TREE_READONLY (decl) = 1;
2257 DECL_ARTIFICIAL (decl) = 1;
2259 init = build_string (length + 1, name);
2260 TREE_TYPE (init) = type;
2261 DECL_INITIAL (decl) = init;
2263 TREE_USED (decl) = 1;
2265 if (current_function_decl)
2267 DECL_CONTEXT (decl) = current_function_decl;
2268 IDENTIFIER_SYMBOL_VALUE (id) = decl;
2269 SCOPE_LIST_APPEND (current_function_scope, names, decl);
2272 finish_decl (decl, init, NULL_TREE);
2277 /* Return a definition for a builtin function named NAME and whose data type
2278 is TYPE. TYPE should be a function type with argument types.
2279 FUNCTION_CODE tells later passes how to compile calls to this function.
2280 See tree.h for its possible values.
2282 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2283 the name to be called if we can't opencode the function. If
2284 ATTRS is nonzero, use that for the function's attribute list. */
2287 builtin_function (const char *name, tree type, int function_code,
2288 enum built_in_class class, const char *library_name,
2291 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
2292 DECL_EXTERNAL (decl) = 1;
2293 TREE_PUBLIC (decl) = 1;
2295 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2296 make_decl_rtl (decl, NULL);
2298 DECL_BUILT_IN_CLASS (decl) = class;
2299 DECL_FUNCTION_CODE (decl) = function_code;
2301 /* Warn if a function in the namespace for users
2302 is used without an occasion to consider it declared. */
2303 if (name[0] != '_' || name[1] != '_')
2304 C_DECL_INVISIBLE (decl) = 1;
2306 /* Possibly apply some default attributes to this built-in function. */
2308 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2310 decl_attributes (&decl, NULL_TREE, 0);
2315 /* Called when a declaration is seen that contains no names to declare.
2316 If its type is a reference to a structure, union or enum inherited
2317 from a containing scope, shadow that tag name for the current scope
2318 with a forward reference.
2319 If its type defines a new named structure or union
2320 or defines an enum, it is valid but we need not do anything here.
2321 Otherwise, it is an error. */
2324 shadow_tag (tree declspecs)
2326 shadow_tag_warned (declspecs, 0);
2330 shadow_tag_warned (tree declspecs, int warned)
2333 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
2340 pending_invalid_xref = 0;
2342 /* Remove the attributes from declspecs, since they will confuse the
2344 split_specs_attrs (declspecs, &specs, &attrs);
2346 for (link = specs; link; link = TREE_CHAIN (link))
2348 tree value = TREE_VALUE (link);
2349 enum tree_code code = TREE_CODE (value);
2351 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2352 /* Used to test also that TYPE_SIZE (value) != 0.
2353 That caused warning for `struct foo;' at top level in the file. */
2355 tree name = TYPE_NAME (value);
2362 if (warned != 1 && code != ENUMERAL_TYPE)
2363 /* Empty unnamed enum OK */
2365 pedwarn ("unnamed struct/union that defines no instances");
2371 t = lookup_tag (code, name, 1);
2375 t = make_node (code);
2382 if (!warned && ! in_system_header)
2384 warning ("useless keyword or type name in empty declaration");
2391 error ("two types specified in one empty declaration");
2396 pedwarn ("empty declaration");
2400 /* Construct an array declarator. EXPR is the expression inside [], or
2401 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2402 to the pointer to which a parameter array is converted). STATIC_P is
2403 nonzero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
2404 is nonzero is the array is [*], a VLA of unspecified length which is
2405 nevertheless a complete type (not currently implemented by GCC),
2406 zero otherwise. The declarator is constructed as an ARRAY_REF
2407 (to be decoded by grokdeclarator), whose operand 0 is what's on the
2408 left of the [] (filled by in set_array_declarator_type) and operand 1
2409 is the expression inside; whose TREE_TYPE is the type qualifiers and
2410 which has TREE_STATIC set if "static" is used. */
2413 build_array_declarator (tree expr, tree quals, int static_p, int vla_unspec_p)
2416 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
2417 TREE_TYPE (decl) = quals;
2418 TREE_STATIC (decl) = (static_p ? 1 : 0);
2419 if (pedantic && !flag_isoc99)
2421 if (static_p || quals != NULL_TREE)
2422 pedwarn ("ISO C90 does not support `static' or type qualifiers in parameter array declarators");
2424 pedwarn ("ISO C90 does not support `[*]' array declarators");
2427 warning ("GCC does not yet properly implement `[*]' array declarators");
2431 /* Set the type of an array declarator. DECL is the declarator, as
2432 constructed by build_array_declarator; TYPE is what appears on the left
2433 of the [] and goes in operand 0. ABSTRACT_P is nonzero if it is an
2434 abstract declarator, zero otherwise; this is used to reject static and
2435 type qualifiers in abstract declarators, where they are not in the
2439 set_array_declarator_type (tree decl, tree type, int abstract_p)
2441 TREE_OPERAND (decl, 0) = type;
2442 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
2443 error ("static or type qualifiers in abstract declarator");
2447 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2450 groktypename (tree typename)
2454 if (TREE_CODE (typename) != TREE_LIST)
2457 split_specs_attrs (TREE_PURPOSE (typename), &specs, &attrs);
2459 typename = grokdeclarator (TREE_VALUE (typename), specs, TYPENAME, 0,
2462 /* Apply attributes. */
2463 decl_attributes (&typename, attrs, 0);
2468 /* Return a PARM_DECL node for a given pair of specs and declarator. */
2471 groktypename_in_parm_context (tree typename)
2473 if (TREE_CODE (typename) != TREE_LIST)
2475 return grokdeclarator (TREE_VALUE (typename),
2476 TREE_PURPOSE (typename),
2480 /* Decode a declarator in an ordinary declaration or data definition.
2481 This is called as soon as the type information and variable name
2482 have been parsed, before parsing the initializer if any.
2483 Here we create the ..._DECL node, fill in its type,
2484 and put it on the list of decls for the current context.
2485 The ..._DECL node is returned as the value.
2487 Exception: for arrays where the length is not specified,
2488 the type is left null, to be filled in by `finish_decl'.
2490 Function definitions do not come here; they go to start_function
2491 instead. However, external and forward declarations of functions
2492 do go through here. Structure field declarations are done by
2493 grokfield and not through here. */
2496 start_decl (tree declarator, tree declspecs, int initialized, tree attributes)
2501 /* An object declared as __attribute__((deprecated)) suppresses
2502 warnings of uses of other deprecated items. */
2503 if (lookup_attribute ("deprecated", attributes))
2504 deprecated_state = DEPRECATED_SUPPRESS;
2506 decl = grokdeclarator (declarator, declspecs,
2507 NORMAL, initialized, NULL);
2509 deprecated_state = DEPRECATED_NORMAL;
2511 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
2512 && MAIN_NAME_P (DECL_NAME (decl)))
2513 warning ("%J'%D' is usually a function", decl, decl);
2516 /* Is it valid for this decl to have an initializer at all?
2517 If not, set INITIALIZED to zero, which will indirectly
2518 tell `finish_decl' to ignore the initializer once it is parsed. */
2519 switch (TREE_CODE (decl))
2522 error ("typedef `%s' is initialized (use __typeof__ instead)",
2523 IDENTIFIER_POINTER (DECL_NAME (decl)));
2528 error ("function `%s' is initialized like a variable",
2529 IDENTIFIER_POINTER (DECL_NAME (decl)));
2534 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
2535 error ("parameter `%s' is initialized",
2536 IDENTIFIER_POINTER (DECL_NAME (decl)));
2541 /* Don't allow initializations for incomplete types
2542 except for arrays which might be completed by the initialization. */
2544 /* This can happen if the array size is an undefined macro. We already
2545 gave a warning, so we don't need another one. */
2546 if (TREE_TYPE (decl) == error_mark_node)
2548 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
2550 /* A complete type is ok if size is fixed. */
2552 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
2553 || C_DECL_VARIABLE_SIZE (decl))
2555 error ("variable-sized object may not be initialized");
2559 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
2561 error ("variable `%s' has initializer but incomplete type",
2562 IDENTIFIER_POINTER (DECL_NAME (decl)));
2565 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
2567 error ("elements of array `%s' have incomplete type",
2568 IDENTIFIER_POINTER (DECL_NAME (decl)));
2575 DECL_EXTERNAL (decl) = 0;
2576 if (current_scope == global_scope)
2577 TREE_STATIC (decl) = 1;
2579 /* Tell `pushdecl' this is an initialized decl
2580 even though we don't yet have the initializer expression.
2581 Also tell `finish_decl' it may store the real initializer. */
2582 DECL_INITIAL (decl) = error_mark_node;
2585 /* If this is a function declaration, write a record describing it to the
2586 prototypes file (if requested). */
2588 if (TREE_CODE (decl) == FUNCTION_DECL)
2589 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
2591 /* ANSI specifies that a tentative definition which is not merged with
2592 a non-tentative definition behaves exactly like a definition with an
2593 initializer equal to zero. (Section 3.7.2)
2595 -fno-common gives strict ANSI behavior, though this tends to break
2596 a large body of code that grew up without this rule.
2598 Thread-local variables are never common, since there's no entrenched
2599 body of code to break, and it allows more efficient variable references
2600 in the presence of dynamic linking. */
2602 if (TREE_CODE (decl) == VAR_DECL
2604 && TREE_PUBLIC (decl)
2605 && !DECL_THREAD_LOCAL (decl)
2607 DECL_COMMON (decl) = 1;
2609 /* Set attributes here so if duplicate decl, will have proper attributes. */
2610 decl_attributes (&decl, attributes, 0);
2612 if (TREE_CODE (decl) == FUNCTION_DECL
2613 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
2615 tree ce = declarator;
2617 if (TREE_CODE (ce) == INDIRECT_REF)
2618 ce = TREE_OPERAND (declarator, 0);
2619 if (TREE_CODE (ce) == CALL_EXPR)
2621 tree args = TREE_PURPOSE (TREE_OPERAND (ce, 1));
2622 for (; args; args = TREE_CHAIN (args))
2624 tree type = TREE_TYPE (args);
2625 if (INTEGRAL_TYPE_P (type)
2626 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
2627 DECL_ARG_TYPE (args) = integer_type_node;
2632 if (TREE_CODE (decl) == FUNCTION_DECL
2633 && DECL_DECLARED_INLINE_P (decl)
2634 && DECL_UNINLINABLE (decl)
2635 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
2636 warning ("%Jinline function '%D' given attribute noinline", decl, decl);
2638 /* Add this decl to the current scope.
2639 TEM may equal DECL or it may be a previous decl of the same name. */
2640 tem = pushdecl (decl);
2642 /* For a local variable, define the RTL now. */
2643 if (current_scope != global_scope
2644 /* But not if this is a duplicate decl
2645 and we preserved the rtl from the previous one
2646 (which may or may not happen). */
2647 && !DECL_RTL_SET_P (tem)
2648 && DECL_FILE_SCOPE_P (tem))
2650 if (TREE_TYPE (tem) != error_mark_node
2651 && (COMPLETE_TYPE_P (TREE_TYPE (tem))
2652 || (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
2653 && DECL_INITIAL (tem) != 0)))
2660 /* Finish processing of a declaration;
2661 install its initial value.
2662 If the length of an array type is not known before,
2663 it must be determined now, from the initial value, or it is an error. */
2666 finish_decl (tree decl, tree init, tree asmspec_tree)
2668 tree type = TREE_TYPE (decl);
2669 int was_incomplete = (DECL_SIZE (decl) == 0);
2670 const char *asmspec = 0;
2672 /* If a name was specified, get the string. */
2673 if (current_scope == global_scope)
2674 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
2676 asmspec = TREE_STRING_POINTER (asmspec_tree);
2678 /* If `start_decl' didn't like having an initialization, ignore it now. */
2679 if (init != 0 && DECL_INITIAL (decl) == 0)
2682 /* Don't crash if parm is initialized. */
2683 if (TREE_CODE (decl) == PARM_DECL)
2687 store_init_value (decl, init);
2689 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
2690 || TREE_CODE (decl) == FUNCTION_DECL
2691 || TREE_CODE (decl) == FIELD_DECL))
2692 objc_check_decl (decl);
2694 /* Deduce size of array from initialization, if not already known. */
2695 if (TREE_CODE (type) == ARRAY_TYPE
2696 && TYPE_DOMAIN (type) == 0
2697 && TREE_CODE (decl) != TYPE_DECL)
2700 = (TREE_STATIC (decl)
2701 /* Even if pedantic, an external linkage array
2702 may have incomplete type at first. */
2703 ? pedantic && !TREE_PUBLIC (decl)
2704 : !DECL_EXTERNAL (decl));
2706 = complete_array_type (type, DECL_INITIAL (decl), do_default);
2708 /* Get the completed type made by complete_array_type. */
2709 type = TREE_TYPE (decl);
2712 error ("%Jinitializer fails to determine size of '%D'", decl, decl);
2714 else if (failure == 2)
2717 error ("%Jarray size missing in '%D'", decl, decl);
2718 /* If a `static' var's size isn't known,
2719 make it extern as well as static, so it does not get
2721 If it is not `static', then do not mark extern;
2722 finish_incomplete_decl will give it a default size
2723 and it will get allocated. */
2724 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
2725 DECL_EXTERNAL (decl) = 1;
2728 /* TYPE_MAX_VALUE is always one less than the number of elements
2729 in the array, because we start counting at zero. Therefore,
2730 warn only if the value is less than zero. */
2731 else if (pedantic && TYPE_DOMAIN (type) != 0
2732 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
2733 error ("%Jzero or negative size array '%D'", decl, decl);
2735 layout_decl (decl, 0);
2738 if (TREE_CODE (decl) == VAR_DECL)
2740 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
2741 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
2742 layout_decl (decl, 0);
2744 if (DECL_SIZE (decl) == 0
2745 /* Don't give an error if we already gave one earlier. */
2746 && TREE_TYPE (decl) != error_mark_node
2747 && (TREE_STATIC (decl)
2749 /* A static variable with an incomplete type
2750 is an error if it is initialized.
2751 Also if it is not file scope.
2752 Otherwise, let it through, but if it is not `extern'
2753 then it may cause an error message later. */
2754 (DECL_INITIAL (decl) != 0
2755 || !DECL_FILE_SCOPE_P (decl))
2757 /* An automatic variable with an incomplete type
2759 !DECL_EXTERNAL (decl)))
2761 error ("%Jstorage size of '%D' isn't known", decl, decl);
2762 TREE_TYPE (decl) = error_mark_node;
2765 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
2766 && DECL_SIZE (decl) != 0)
2768 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
2769 constant_expression_warning (DECL_SIZE (decl));
2771 error ("%Jstorage size of '%D' isn't constant", decl, decl);
2774 if (TREE_USED (type))
2775 TREE_USED (decl) = 1;
2778 /* If this is a function and an assembler name is specified, reset DECL_RTL
2779 so we can give it its new name. Also, update built_in_decls if it
2780 was a normal built-in. */
2781 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
2783 /* ASMSPEC is given, and not the name of a register. Mark the
2784 name with a star so assemble_name won't munge it. */
2785 char *starred = alloca (strlen (asmspec) + 2);
2787 strcpy (starred + 1, asmspec);
2789 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
2791 tree builtin = built_in_decls [DECL_FUNCTION_CODE (decl)];
2792 SET_DECL_RTL (builtin, NULL_RTX);
2793 SET_DECL_ASSEMBLER_NAME (builtin, get_identifier (starred));
2794 #ifdef TARGET_MEM_FUNCTIONS
2795 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMCPY)
2796 init_block_move_fn (starred);
2797 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMSET)
2798 init_block_clear_fn (starred);
2800 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_BCOPY)
2801 init_block_move_fn (starred);
2802 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_BZERO)
2803 init_block_clear_fn (starred);
2806 SET_DECL_RTL (decl, NULL_RTX);
2807 change_decl_assembler_name (decl, get_identifier (starred));
2810 /* If #pragma weak was used, mark the decl weak now. */
2811 if (current_scope == global_scope)
2812 maybe_apply_pragma_weak (decl);
2814 /* Output the assembler code and/or RTL code for variables and functions,
2815 unless the type is an undefined structure or union.
2816 If not, it will get done when the type is completed. */
2818 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
2820 /* This is a no-op in c-lang.c or something real in objc-act.c. */
2821 if (c_dialect_objc ())
2822 objc_check_decl (decl);
2824 if (DECL_FILE_SCOPE_P (decl))
2826 if (DECL_INITIAL (decl) == NULL_TREE
2827 || DECL_INITIAL (decl) == error_mark_node)
2828 /* Don't output anything
2829 when a tentative file-scope definition is seen.
2830 But at end of compilation, do output code for them. */
2831 DECL_DEFER_OUTPUT (decl) = 1;
2832 rest_of_decl_compilation (decl, asmspec, true, 0);
2836 /* This is a local variable. If there is an ASMSPEC, the
2837 user has requested that we handle it specially. */
2840 /* In conjunction with an ASMSPEC, the `register'
2841 keyword indicates that we should place the variable
2842 in a particular register. */
2843 if (DECL_REGISTER (decl))
2844 DECL_C_HARD_REGISTER (decl) = 1;
2846 /* If this is not a static variable, issue a warning.
2847 It doesn't make any sense to give an ASMSPEC for an
2848 ordinary, non-register local variable. Historically,
2849 GCC has accepted -- but ignored -- the ASMSPEC in
2851 if (TREE_CODE (decl) == VAR_DECL
2852 && !DECL_REGISTER (decl)
2853 && !TREE_STATIC (decl))
2854 warning ("%Jignoring asm-specifier for non-static local "
2855 "variable '%D'", decl, decl);
2857 change_decl_assembler_name (decl, get_identifier (asmspec));
2860 if (TREE_CODE (decl) != FUNCTION_DECL)
2861 add_decl_stmt (decl);
2864 if (!DECL_FILE_SCOPE_P (decl))
2866 /* Recompute the RTL of a local array now
2867 if it used to be an incomplete type. */
2869 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
2871 /* If we used it already as memory, it must stay in memory. */
2872 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
2873 /* If it's still incomplete now, no init will save it. */
2874 if (DECL_SIZE (decl) == 0)
2875 DECL_INITIAL (decl) = 0;
2880 /* If this was marked 'used', be sure it will be output. */
2881 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
2882 mark_referenced (DECL_ASSEMBLER_NAME (decl));
2884 if (TREE_CODE (decl) == TYPE_DECL)
2885 rest_of_decl_compilation (decl, NULL, DECL_FILE_SCOPE_P (decl), 0);
2887 /* At the end of a declaration, throw away any variable type sizes
2888 of types defined inside that declaration. There is no use
2889 computing them in the following function definition. */
2890 if (current_scope == global_scope)
2891 get_pending_sizes ();
2893 /* Install a cleanup (aka destructor) if one was given. */
2894 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
2896 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
2899 static bool eh_initialized_p;
2901 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
2902 tree cleanup_decl = lookup_name (cleanup_id);
2905 /* Build "cleanup(&decl)" for the destructor. */
2906 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
2907 cleanup = build_tree_list (NULL_TREE, cleanup);
2908 cleanup = build_function_call (cleanup_decl, cleanup);
2910 /* Don't warn about decl unused; the cleanup uses it. */
2911 TREE_USED (decl) = 1;
2913 /* Initialize EH, if we've been told to do so. */
2914 if (flag_exceptions && !eh_initialized_p)
2916 eh_initialized_p = true;
2917 eh_personality_libfunc
2918 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
2919 ? "__gcc_personality_sj0"
2920 : "__gcc_personality_v0");
2921 using_eh_for_cleanups ();
2924 add_stmt (build_stmt (CLEANUP_STMT, decl, cleanup));
2929 /* Given a parsed parameter declaration, decode it into a PARM_DECL
2930 and push that on the current scope. */
2933 push_parm_decl (tree parm)
2937 /* Don't attempt to expand sizes while parsing this decl.
2938 (We can get here with i_s_e 1 somehow from Objective-C.) */
2939 int save_immediate_size_expand = immediate_size_expand;
2940 immediate_size_expand = 0;
2942 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
2943 TREE_PURPOSE (TREE_PURPOSE (parm)),
2945 decl_attributes (&decl, TREE_VALUE (parm), 0);
2947 decl = pushdecl (decl);
2949 finish_decl (decl, NULL_TREE, NULL_TREE);
2951 immediate_size_expand = save_immediate_size_expand;
2954 /* Mark all the parameter declarations to date as forward decls,
2955 shift them to the variables list, and reset the parameters list.
2956 Also diagnose use of this extension. */
2959 mark_forward_parm_decls (void)
2963 if (pedantic && !current_scope->warned_forward_parm_decls)
2965 pedwarn ("ISO C forbids forward parameter declarations");
2966 current_scope->warned_forward_parm_decls = true;
2969 for (parm = current_scope->parms; parm; parm = TREE_CHAIN (parm))
2970 TREE_ASM_WRITTEN (parm) = 1;
2972 SCOPE_LIST_CONCAT (current_scope, names, current_scope, parms);
2973 current_scope->parms = 0;
2974 current_scope->parms_last = 0;
2977 static GTY(()) int compound_literal_number;
2979 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
2980 literal, which may be an incomplete array type completed by the
2981 initializer; INIT is a CONSTRUCTOR that initializes the compound
2985 build_compound_literal (tree type, tree init)
2987 /* We do not use start_decl here because we have a type, not a declarator;
2988 and do not use finish_decl because the decl should be stored inside
2989 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_STMT. */
2990 tree decl = build_decl (VAR_DECL, NULL_TREE, type);
2993 DECL_EXTERNAL (decl) = 0;
2994 TREE_PUBLIC (decl) = 0;
2995 TREE_STATIC (decl) = (current_scope == global_scope);
2996 DECL_CONTEXT (decl) = current_function_decl;
2997 TREE_USED (decl) = 1;
2998 TREE_TYPE (decl) = type;
2999 TREE_READONLY (decl) = TREE_READONLY (type);
3000 store_init_value (decl, init);
3002 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3004 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3009 type = TREE_TYPE (decl);
3010 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3011 return error_mark_node;
3013 stmt = build_stmt (DECL_STMT, decl);
3014 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3015 TREE_SIDE_EFFECTS (complit) = 1;
3017 layout_decl (decl, 0);
3019 if (TREE_STATIC (decl))
3021 /* This decl needs a name for the assembler output. We also need
3022 a unique suffix to be added to the name. */
3025 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
3026 compound_literal_number);
3027 compound_literal_number++;
3028 DECL_NAME (decl) = get_identifier (name);
3029 DECL_DEFER_OUTPUT (decl) = 1;
3030 DECL_COMDAT (decl) = 1;
3031 DECL_ARTIFICIAL (decl) = 1;
3033 rest_of_decl_compilation (decl, NULL, 1, 0);
3039 /* Make TYPE a complete type based on INITIAL_VALUE.
3040 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3041 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3044 complete_array_type (tree type, tree initial_value, int do_default)
3046 tree maxindex = NULL_TREE;
3051 /* Note MAXINDEX is really the maximum index,
3052 one less than the size. */
3053 if (TREE_CODE (initial_value) == STRING_CST)
3056 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3057 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3060 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3062 tree elts = CONSTRUCTOR_ELTS (initial_value);
3063 maxindex = build_int_2 (-1, -1);
3064 for (; elts; elts = TREE_CHAIN (elts))
3066 if (TREE_PURPOSE (elts))
3067 maxindex = TREE_PURPOSE (elts);
3069 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3070 maxindex, integer_one_node));
3072 maxindex = copy_node (maxindex);
3076 /* Make an error message unless that happened already. */
3077 if (initial_value != error_mark_node)
3080 /* Prevent further error messages. */
3081 maxindex = build_int_2 (0, 0);
3088 maxindex = build_int_2 (0, 0);
3094 TYPE_DOMAIN (type) = build_index_type (maxindex);
3095 if (!TREE_TYPE (maxindex))
3096 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3099 /* Lay out the type now that we can get the real answer. */
3106 /* Determine whether TYPE is a structure with a flexible array member,
3107 or a union containing such a structure (possibly recursively). */
3110 flexible_array_type_p (tree type)
3113 switch (TREE_CODE (type))
3116 x = TYPE_FIELDS (type);
3119 while (TREE_CHAIN (x) != NULL_TREE)
3121 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3122 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3123 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3124 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3128 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3130 if (flexible_array_type_p (TREE_TYPE (x)))
3139 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3140 replacing with appropriate values if they are invalid. */
3142 check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
3145 unsigned int max_width;
3146 unsigned HOST_WIDE_INT w;
3147 const char *name = orig_name ? orig_name: _("<anonymous>");
3150 STRIP_NOPS (*width);
3152 /* Detect and ignore out of range field width and process valid
3154 if (TREE_CODE (*width) != INTEGER_CST)
3156 error ("bit-field `%s' width not an integer constant", name);
3157 *width = integer_one_node;
3161 constant_expression_warning (*width);
3162 if (tree_int_cst_sgn (*width) < 0)
3164 error ("negative width in bit-field `%s'", name);
3165 *width = integer_one_node;
3167 else if (integer_zerop (*width) && orig_name)
3169 error ("zero width for bit-field `%s'", name);
3170 *width = integer_one_node;
3174 /* Detect invalid bit-field type. */
3175 if (TREE_CODE (*type) != INTEGER_TYPE
3176 && TREE_CODE (*type) != BOOLEAN_TYPE
3177 && TREE_CODE (*type) != ENUMERAL_TYPE)
3179 error ("bit-field `%s' has invalid type", name);
3180 *type = unsigned_type_node;
3183 type_mv = TYPE_MAIN_VARIANT (*type);
3185 && type_mv != integer_type_node
3186 && type_mv != unsigned_type_node
3187 && type_mv != boolean_type_node)
3188 pedwarn ("type of bit-field `%s' is a GCC extension", name);
3190 if (type_mv == boolean_type_node)
3191 max_width = CHAR_TYPE_SIZE;
3193 max_width = TYPE_PRECISION (*type);
3195 if (0 < compare_tree_int (*width, max_width))
3197 error ("width of `%s' exceeds its type", name);
3199 *width = build_int_2 (w, 0);
3202 w = tree_low_cst (*width, 1);
3204 if (TREE_CODE (*type) == ENUMERAL_TYPE
3205 && (w < min_precision (TYPE_MIN_VALUE (*type), TREE_UNSIGNED (*type))
3206 || w < min_precision (TYPE_MAX_VALUE (*type), TREE_UNSIGNED (*type))))
3207 warning ("`%s' is narrower than values of its type", name);
3210 /* Given declspecs and a declarator,
3211 determine the name and type of the object declared
3212 and construct a ..._DECL node for it.
3213 (In one case we can return a ..._TYPE node instead.
3214 For invalid input we sometimes return 0.)
3216 DECLSPECS is a chain of tree_list nodes whose value fields
3217 are the storage classes and type specifiers.
3219 DECL_CONTEXT says which syntactic context this declaration is in:
3220 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3221 FUNCDEF for a function definition. Like NORMAL but a few different
3222 error messages in each case. Return value may be zero meaning
3223 this definition is too screwy to try to parse.
3224 PARM for a parameter declaration (either within a function prototype
3225 or before a function body). Make a PARM_DECL, or return void_type_node.
3226 TYPENAME if for a typename (in a cast or sizeof).
3227 Don't make a DECL node; just return the ..._TYPE node.
3228 FIELD for a struct or union field; make a FIELD_DECL.
3229 INITIALIZED is 1 if the decl has an initializer.
3230 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3231 representing the width of the bit-field.
3233 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3234 It may also be so in the PARM case, for a prototype where the
3235 argument type is specified but not the name.
3237 This function is where the complicated C meanings of `static'
3238 and `extern' are interpreted. */
3241 grokdeclarator (tree declarator, tree declspecs,
3242 enum decl_context decl_context, int initialized, tree *width)
3246 tree type = NULL_TREE;
3251 int type_quals = TYPE_UNQUALIFIED;
3253 int explicit_int = 0;
3254 int explicit_char = 0;
3255 int defaulted_int = 0;
3256 tree typedef_decl = 0;
3257 const char *name, *orig_name;
3258 tree typedef_type = 0;
3259 int funcdef_flag = 0;
3260 enum tree_code innermost_code = ERROR_MARK;
3261 int size_varies = 0;
3262 tree decl_attr = NULL_TREE;
3263 tree array_ptr_quals = NULL_TREE;
3264 int array_parm_static = 0;
3265 tree returned_attrs = NULL_TREE;
3266 bool bitfield = width != NULL;
3269 if (decl_context == FUNCDEF)
3270 funcdef_flag = 1, decl_context = NORMAL;
3272 /* Look inside a declarator for the name being declared
3273 and get it as a string, for an error message. */
3275 tree decl = declarator;
3279 switch (TREE_CODE (decl))
3284 innermost_code = TREE_CODE (decl);
3285 decl = TREE_OPERAND (decl, 0);
3289 decl = TREE_VALUE (decl);
3292 case IDENTIFIER_NODE:
3293 name = IDENTIFIER_POINTER (decl);
3305 /* A function definition's declarator must have the form of
3306 a function declarator. */
3308 if (funcdef_flag && innermost_code != CALL_EXPR)
3311 /* If this looks like a function definition, make it one,
3312 even if it occurs where parms are expected.
3313 Then store_parm_decls will reject it and not use it as a parm. */
3314 if (decl_context == NORMAL && !funcdef_flag
3315 && current_scope->parm_flag)
3316 decl_context = PARM;
3318 /* Look through the decl specs and record which ones appear.
3319 Some typespecs are defined as built-in typenames.
3320 Others, the ones that are modifiers of other types,
3321 are represented by bits in SPECBITS: set the bits for
3322 the modifiers that appear. Storage class keywords are also in SPECBITS.
3324 If there is a typedef name or a type, store the type in TYPE.
3325 This includes builtin typedefs such as `int'.
3327 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3328 and did not come from a user typedef.
3330 Set LONGLONG if `long' is mentioned twice. */
3332 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3334 tree id = TREE_VALUE (spec);
3336 /* If the entire declaration is itself tagged as deprecated then
3337 suppress reports of deprecated items. */
3338 if (id && TREE_DEPRECATED (id))
3340 if (deprecated_state != DEPRECATED_SUPPRESS)
3341 warn_deprecated_use (id);
3344 if (id == ridpointers[(int) RID_INT])
3346 if (id == ridpointers[(int) RID_CHAR])
3349 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3351 enum rid i = C_RID_CODE (id);
3352 if ((int) i <= (int) RID_LAST_MODIFIER)
3354 if (i == RID_LONG && (specbits & (1 << (int) RID_LONG)))
3357 error ("`long long long' is too long for GCC");
3360 if (pedantic && !flag_isoc99 && ! in_system_header
3362 pedwarn ("ISO C90 does not support `long long'");
3366 else if (specbits & (1 << (int) i))
3368 if (i == RID_CONST || i == RID_VOLATILE || i == RID_RESTRICT)
3371 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3374 error ("duplicate `%s'", IDENTIFIER_POINTER (id));
3377 /* Diagnose "__thread extern". Recall that this list
3378 is in the reverse order seen in the text. */
3380 && (specbits & (1 << (int) RID_EXTERN
3381 | 1 << (int) RID_STATIC)))
3383 if (specbits & 1 << (int) RID_EXTERN)
3384 error ("`__thread' before `extern'");
3386 error ("`__thread' before `static'");
3389 specbits |= 1 << (int) i;
3394 error ("two or more data types in declaration of `%s'", name);
3395 /* Actual typedefs come to us as TYPE_DECL nodes. */
3396 else if (TREE_CODE (id) == TYPE_DECL)
3398 if (TREE_TYPE (id) == error_mark_node)
3399 ; /* Allow the type to default to int to avoid cascading errors. */
3402 type = TREE_TYPE (id);
3403 decl_attr = DECL_ATTRIBUTES (id);
3407 /* Built-in types come as identifiers. */
3408 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3410 tree t = lookup_name (id);
3411 if (TREE_TYPE (t) == error_mark_node)
3413 else if (!t || TREE_CODE (t) != TYPE_DECL)
3414 error ("`%s' fails to be a typedef or built in type",
3415 IDENTIFIER_POINTER (id));
3418 type = TREE_TYPE (t);
3422 else if (TREE_CODE (id) != ERROR_MARK)
3429 typedef_type = type;
3431 size_varies = C_TYPE_VARIABLE_SIZE (type);
3433 /* No type at all: default to `int', and set DEFAULTED_INT
3434 because it was not a user-defined typedef. */
3438 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3439 | (1 << (int) RID_SIGNED)
3440 | (1 << (int) RID_UNSIGNED)
3441 | (1 << (int) RID_COMPLEX))))
3442 /* Don't warn about typedef foo = bar. */
3443 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
3444 && ! in_system_header)
3446 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
3447 and this is a function, or if -Wimplicit; prefer the former
3448 warning since it is more explicit. */
3449 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3451 warn_about_return_type = 1;
3452 else if (warn_implicit_int || flag_isoc99)
3453 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
3458 type = integer_type_node;
3461 /* Now process the modifiers that were specified
3462 and check for invalid combinations. */
3464 /* Long double is a special combination. */
3466 if ((specbits & 1 << (int) RID_LONG) && ! longlong
3467 && TYPE_MAIN_VARIANT (type) == double_type_node)
3469 specbits &= ~(1 << (int) RID_LONG);
3470 type = long_double_type_node;
3473 /* Check all other uses of type modifiers. */
3475 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3476 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3480 if ((specbits & 1 << (int) RID_LONG)
3481 && (specbits & 1 << (int) RID_SHORT))
3482 error ("both long and short specified for `%s'", name);
3483 else if (((specbits & 1 << (int) RID_LONG)
3484 || (specbits & 1 << (int) RID_SHORT))
3486 error ("long or short specified with char for `%s'", name);
3487 else if (((specbits & 1 << (int) RID_LONG)
3488 || (specbits & 1 << (int) RID_SHORT))
3489 && TREE_CODE (type) == REAL_TYPE)
3491 static int already = 0;
3493 error ("long or short specified with floating type for `%s'", name);
3494 if (! already && ! pedantic)
3496 error ("the only valid combination is `long double'");
3500 else if ((specbits & 1 << (int) RID_SIGNED)
3501 && (specbits & 1 << (int) RID_UNSIGNED))
3502 error ("both signed and unsigned specified for `%s'", name);
3503 else if (TREE_CODE (type) != INTEGER_TYPE)
3504 error ("long, short, signed or unsigned invalid for `%s'", name);
3508 if (!explicit_int && !defaulted_int && !explicit_char)
3510 error ("long, short, signed or unsigned used invalidly for `%s'",
3516 /* Discard the type modifiers if they are invalid. */
3519 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3520 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
3525 if ((specbits & (1 << (int) RID_COMPLEX))
3526 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
3528 error ("complex invalid for `%s'", name);
3529 specbits &= ~(1 << (int) RID_COMPLEX);
3532 /* Decide whether an integer type is signed or not.
3533 Optionally treat bit-fields as signed by default. */
3534 if (specbits & 1 << (int) RID_UNSIGNED
3535 || (bitfield && ! flag_signed_bitfields
3536 && (explicit_int || defaulted_int || explicit_char
3537 /* A typedef for plain `int' without `signed'
3538 can be controlled just like plain `int'. */
3539 || ! (typedef_decl != 0
3540 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
3541 && TREE_CODE (type) != ENUMERAL_TYPE
3542 && !(specbits & 1 << (int) RID_SIGNED)))
3545 type = long_long_unsigned_type_node;
3546 else if (specbits & 1 << (int) RID_LONG)
3547 type = long_unsigned_type_node;
3548 else if (specbits & 1 << (int) RID_SHORT)
3549 type = short_unsigned_type_node;
3550 else if (type == char_type_node)
3551 type = unsigned_char_type_node;
3552 else if (typedef_decl)
3553 type = c_common_unsigned_type (type);
3555 type = unsigned_type_node;
3557 else if ((specbits & 1 << (int) RID_SIGNED)
3558 && type == char_type_node)
3559 type = signed_char_type_node;
3561 type = long_long_integer_type_node;
3562 else if (specbits & 1 << (int) RID_LONG)
3563 type = long_integer_type_node;
3564 else if (specbits & 1 << (int) RID_SHORT)
3565 type = short_integer_type_node;
3567 if (specbits & 1 << (int) RID_COMPLEX)
3569 if (pedantic && !flag_isoc99)
3570 pedwarn ("ISO C90 does not support complex types");
3571 /* If we just have "complex", it is equivalent to
3572 "complex double", but if any modifiers at all are specified it is
3573 the complex form of TYPE. E.g, "complex short" is
3574 "complex short int". */
3576 if (defaulted_int && ! longlong
3577 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3578 | (1 << (int) RID_SIGNED)
3579 | (1 << (int) RID_UNSIGNED))))
3582 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
3583 type = complex_double_type_node;
3585 else if (type == integer_type_node)
3588 pedwarn ("ISO C does not support complex integer types");
3589 type = complex_integer_type_node;
3591 else if (type == float_type_node)
3592 type = complex_float_type_node;
3593 else if (type == double_type_node)
3594 type = complex_double_type_node;
3595 else if (type == long_double_type_node)
3596 type = complex_long_double_type_node;
3600 pedwarn ("ISO C does not support complex integer types");
3601 type = build_complex_type (type);
3605 /* Check the type and width of a bit-field. */
3607 check_bitfield_type_and_width (&type, width, orig_name);
3609 /* Figure out the type qualifiers for the declaration. There are
3610 two ways a declaration can become qualified. One is something
3611 like `const int i' where the `const' is explicit. Another is
3612 something like `typedef const int CI; CI i' where the type of the
3613 declaration contains the `const'. A third possibility is that
3614 there is a type qualifier on the element type of a typedefed
3615 array type, in which case we should extract that qualifier so
3616 that c_apply_type_quals_to_decls receives the full list of
3617 qualifiers to work with (C90 is not entirely clear about whether
3618 duplicate qualifiers should be diagnosed in this case, but it
3619 seems most appropriate to do so). */
3620 element_type = strip_array_types (type);
3621 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (element_type);
3623 = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (element_type);
3625 = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (element_type);
3626 inlinep = !! (specbits & (1 << (int) RID_INLINE));
3627 if (constp > 1 && ! flag_isoc99)
3628 pedwarn ("duplicate `const'");
3629 if (restrictp > 1 && ! flag_isoc99)
3630 pedwarn ("duplicate `restrict'");
3631 if (volatilep > 1 && ! flag_isoc99)
3632 pedwarn ("duplicate `volatile'");
3633 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
3634 type = TYPE_MAIN_VARIANT (type);
3635 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3636 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3637 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3639 /* Warn if two storage classes are given. Default to `auto'. */
3644 if (specbits & 1 << (int) RID_AUTO) nclasses++;
3645 if (specbits & 1 << (int) RID_STATIC) nclasses++;
3646 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
3647 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
3648 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
3650 /* "static __thread" and "extern __thread" are allowed. */
3651 if ((specbits & (1 << (int) RID_THREAD
3652 | 1 << (int) RID_STATIC
3653 | 1 << (int) RID_EXTERN)) == (1 << (int) RID_THREAD))
3656 /* Warn about storage classes that are invalid for certain
3657 kinds of declarations (parameters, typenames, etc.). */
3660 error ("multiple storage classes in declaration of `%s'", name);
3661 else if (funcdef_flag
3663 & ((1 << (int) RID_REGISTER)
3664 | (1 << (int) RID_AUTO)
3665 | (1 << (int) RID_TYPEDEF)
3666 | (1 << (int) RID_THREAD))))
3668 if (specbits & 1 << (int) RID_AUTO
3669 && (pedantic || current_scope == global_scope))
3670 pedwarn ("function definition declared `auto'");
3671 if (specbits & 1 << (int) RID_REGISTER)
3672 error ("function definition declared `register'");
3673 if (specbits & 1 << (int) RID_TYPEDEF)
3674 error ("function definition declared `typedef'");
3675 if (specbits & 1 << (int) RID_THREAD)
3676 error ("function definition declared `__thread'");
3677 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3678 | (1 << (int) RID_AUTO) | (1 << (int) RID_THREAD));
3680 else if (decl_context != NORMAL && nclasses > 0)
3682 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
3686 switch (decl_context)
3689 error ("storage class specified for structure field `%s'",
3693 error ("storage class specified for parameter `%s'", name);
3696 error ("storage class specified for typename");
3699 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3700 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
3701 | (1 << (int) RID_EXTERN) | (1 << (int) RID_THREAD));
3704 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
3706 /* `extern' with initialization is invalid if not at file scope. */
3707 if (current_scope == global_scope)
3708 warning ("`%s' initialized and declared `extern'", name);
3710 error ("`%s' has both `extern' and initializer", name);
3712 else if (current_scope == global_scope)
3714 if (specbits & 1 << (int) RID_AUTO)
3715 error ("file-scope declaration of `%s' specifies `auto'", name);
3719 if (specbits & 1 << (int) RID_EXTERN && funcdef_flag)
3720 error ("nested function `%s' declared `extern'", name);
3721 else if ((specbits & (1 << (int) RID_THREAD
3722 | 1 << (int) RID_EXTERN
3723 | 1 << (int) RID_STATIC))
3724 == (1 << (int) RID_THREAD))
3726 error ("function-scope `%s' implicitly auto and declared `__thread'",
3728 specbits &= ~(1 << (int) RID_THREAD);
3733 /* Now figure out the structure of the declarator proper.
3734 Descend through it, creating more complex types, until we reach
3735 the declared identifier (or NULL_TREE, in an absolute declarator). */
3737 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
3739 if (type == error_mark_node)
3741 declarator = TREE_OPERAND (declarator, 0);
3745 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
3746 an INDIRECT_REF (for *...),
3747 a CALL_EXPR (for ...(...)),
3748 a TREE_LIST (for nested attributes),
3749 an identifier (for the name being declared)
3750 or a null pointer (for the place in an absolute declarator
3751 where the name was omitted).
3752 For the last two cases, we have just exited the loop.
3754 At this point, TYPE is the type of elements of an array,
3755 or for a function to return, or for a pointer to point to.
3756 After this sequence of ifs, TYPE is the type of the
3757 array or function or pointer, and DECLARATOR has had its
3758 outermost layer removed. */
3760 if (array_ptr_quals != NULL_TREE || array_parm_static)
3762 /* Only the innermost declarator (making a parameter be of
3763 array type which is converted to pointer type)
3764 may have static or type qualifiers. */
3765 error ("static or type qualifiers in non-parameter array declarator");
3766 array_ptr_quals = NULL_TREE;
3767 array_parm_static = 0;
3770 if (TREE_CODE (declarator) == TREE_LIST)
3772 /* We encode a declarator with embedded attributes using
3774 tree attrs = TREE_PURPOSE (declarator);
3777 declarator = TREE_VALUE (declarator);
3778 inner_decl = declarator;
3779 while (inner_decl != NULL_TREE
3780 && TREE_CODE (inner_decl) == TREE_LIST)
3781 inner_decl = TREE_VALUE (inner_decl);
3782 if (inner_decl == NULL_TREE
3783 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
3784 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
3785 else if (TREE_CODE (inner_decl) == CALL_EXPR)
3786 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
3787 else if (TREE_CODE (inner_decl) == ARRAY_REF)
3788 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
3789 returned_attrs = decl_attributes (&type,
3790 chainon (returned_attrs, attrs),
3793 else if (TREE_CODE (declarator) == ARRAY_REF)
3795 tree itype = NULL_TREE;
3796 tree size = TREE_OPERAND (declarator, 1);
3797 /* The index is a signed object `sizetype' bits wide. */
3798 tree index_type = c_common_signed_type (sizetype);
3800 array_ptr_quals = TREE_TYPE (declarator);
3801 array_parm_static = TREE_STATIC (declarator);
3803 declarator = TREE_OPERAND (declarator, 0);
3805 /* Check for some types that there cannot be arrays of. */
3807 if (VOID_TYPE_P (type))
3809 error ("declaration of `%s' as array of voids", name);
3810 type = error_mark_node;
3813 if (TREE_CODE (type) == FUNCTION_TYPE)
3815 error ("declaration of `%s' as array of functions", name);
3816 type = error_mark_node;
3819 if (pedantic && flexible_array_type_p (type))
3820 pedwarn ("invalid use of structure with flexible array member");
3822 if (size == error_mark_node)
3823 type = error_mark_node;
3825 if (type == error_mark_node)
3828 /* If size was specified, set ITYPE to a range-type for that size.
3829 Otherwise, ITYPE remains null. finish_decl may figure it out
3830 from an initial value. */
3834 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3835 STRIP_TYPE_NOPS (size);
3837 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
3839 error ("size of array `%s' has non-integer type", name);
3840 size = integer_one_node;
3843 if (pedantic && integer_zerop (size))
3844 pedwarn ("ISO C forbids zero-size array `%s'", name);
3846 if (TREE_CODE (size) == INTEGER_CST)
3848 constant_expression_warning (size);
3849 if (tree_int_cst_sgn (size) < 0)
3851 error ("size of array `%s' is negative", name);
3852 size = integer_one_node;
3857 /* Make sure the array size remains visibly nonconstant
3858 even if it is (eg) a const variable with known value. */
3861 if (!flag_isoc99 && pedantic)
3863 if (TREE_CONSTANT (size))
3864 pedwarn ("ISO C90 forbids array `%s' whose size can't be evaluated",
3867 pedwarn ("ISO C90 forbids variable-size array `%s'",
3872 if (integer_zerop (size))
3874 /* A zero-length array cannot be represented with an
3875 unsigned index type, which is what we'll get with
3876 build_index_type. Create an open-ended range instead. */
3877 itype = build_range_type (sizetype, size, NULL_TREE);
3881 /* Compute the maximum valid index, that is, size - 1.
3882 Do the calculation in index_type, so that if it is
3883 a variable the computations will be done in the
3885 itype = fold (build (MINUS_EXPR, index_type,
3886 convert (index_type, size),
3887 convert (index_type, size_one_node)));
3889 /* If that overflowed, the array is too big.
3890 ??? While a size of INT_MAX+1 technically shouldn't
3891 cause an overflow (because we subtract 1), the overflow
3892 is recorded during the conversion to index_type, before
3893 the subtraction. Handling this case seems like an
3894 unnecessary complication. */
3895 if (TREE_OVERFLOW (itype))
3897 error ("size of array `%s' is too large", name);
3898 type = error_mark_node;
3904 /* We must be able to distinguish the
3905 SAVE_EXPR_CONTEXT for the variably-sized type
3906 so that we can set it correctly in
3907 set_save_expr_context. The convention is
3908 that all SAVE_EXPRs that need to be reset
3909 have NULL_TREE for their SAVE_EXPR_CONTEXT. */
3910 tree cfd = current_function_decl;
3911 if (decl_context == PARM)
3912 current_function_decl = NULL_TREE;
3913 itype = variable_size (itype);
3914 if (decl_context == PARM)
3915 current_function_decl = cfd;
3917 itype = build_index_type (itype);
3920 else if (decl_context == FIELD)
3922 if (pedantic && !flag_isoc99 && !in_system_header)
3923 pedwarn ("ISO C90 does not support flexible array members");
3925 /* ISO C99 Flexible array members are effectively identical
3926 to GCC's zero-length array extension. */
3927 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
3930 /* If pedantic, complain about arrays of incomplete types. */
3932 if (pedantic && !COMPLETE_TYPE_P (type))
3933 pedwarn ("array type has incomplete element type");
3935 /* Build the array type itself, then merge any constancy or
3936 volatility into the target type. We must do it in this order
3937 to ensure that the TYPE_MAIN_VARIANT field of the array type
3938 is set correctly. */
3940 type = build_array_type (type, itype);
3942 type = c_build_qualified_type (type, type_quals);
3945 C_TYPE_VARIABLE_SIZE (type) = 1;
3947 /* The GCC extension for zero-length arrays differs from
3948 ISO flexible array members in that sizeof yields zero. */
3949 if (size && integer_zerop (size))
3952 TYPE_SIZE (type) = bitsize_zero_node;
3953 TYPE_SIZE_UNIT (type) = size_zero_node;
3955 if (decl_context != PARM
3956 && (array_ptr_quals != NULL_TREE || array_parm_static))
3958 error ("static or type qualifiers in non-parameter array declarator");
3959 array_ptr_quals = NULL_TREE;
3960 array_parm_static = 0;
3963 else if (TREE_CODE (declarator) == CALL_EXPR)
3967 /* Declaring a function type.
3968 Make sure we have a valid type for the function to return. */
3969 if (type == error_mark_node)
3974 /* Warn about some types functions can't return. */
3976 if (TREE_CODE (type) == FUNCTION_TYPE)
3978 error ("`%s' declared as function returning a function", name);
3979 type = integer_type_node;
3981 if (TREE_CODE (type) == ARRAY_TYPE)
3983 error ("`%s' declared as function returning an array", name);
3984 type = integer_type_node;
3987 /* Construct the function type and go to the next
3988 inner layer of declarator. */
3990 arg_types = grokparms (TREE_OPERAND (declarator, 1),
3992 /* Say it's a definition
3993 only for the CALL_EXPR
3994 closest to the identifier. */
3995 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
3996 /* Type qualifiers before the return type of the function
3997 qualify the return type, not the function type. */
4000 /* Type qualifiers on a function return type are normally
4001 permitted by the standard but have no effect, so give a
4002 warning at -Wextra. Qualifiers on a void return type have
4003 meaning as a GNU extension, and are banned on function
4004 definitions in ISO C. FIXME: strictly we shouldn't
4005 pedwarn for qualified void return types except on function
4006 definitions, but not doing so could lead to the undesirable
4007 state of a "volatile void" function return type not being
4008 warned about, and a use of the function being compiled
4009 with GNU semantics, with no diagnostics under -pedantic. */
4010 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4011 pedwarn ("ISO C forbids qualified void function return type");
4012 else if (extra_warnings
4013 && !(VOID_TYPE_P (type)
4014 && type_quals == TYPE_QUAL_VOLATILE))
4015 warning ("type qualifiers ignored on function return type");
4017 type = c_build_qualified_type (type, type_quals);
4019 type_quals = TYPE_UNQUALIFIED;
4021 type = build_function_type (type, arg_types);
4022 declarator = TREE_OPERAND (declarator, 0);
4024 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4025 the formal parameter list of this FUNCTION_TYPE to point to
4026 the FUNCTION_TYPE node itself. */
4031 for (link = last_function_parm_tags;
4033 link = TREE_CHAIN (link))
4034 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4037 else if (TREE_CODE (declarator) == INDIRECT_REF)
4039 /* Merge any constancy or volatility into the target type
4042 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4044 pedwarn ("ISO C forbids qualified function types");
4046 type = c_build_qualified_type (type, type_quals);
4047 type_quals = TYPE_UNQUALIFIED;
4050 type = build_pointer_type (type);
4052 /* Process a list of type modifier keywords
4053 (such as const or volatile) that were given inside the `*'. */
4055 if (TREE_TYPE (declarator))
4063 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4064 typemodlist = TREE_CHAIN (typemodlist))
4066 tree qualifier = TREE_VALUE (typemodlist);
4068 if (C_IS_RESERVED_WORD (qualifier))
4070 if (C_RID_CODE (qualifier) == RID_CONST)
4072 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4074 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4084 error ("invalid type modifier within pointer declarator");
4085 if (constp > 1 && ! flag_isoc99)
4086 pedwarn ("duplicate `const'");
4087 if (volatilep > 1 && ! flag_isoc99)
4088 pedwarn ("duplicate `volatile'");
4089 if (restrictp > 1 && ! flag_isoc99)
4090 pedwarn ("duplicate `restrict'");
4092 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4093 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4094 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4097 declarator = TREE_OPERAND (declarator, 0);
4104 /* Now TYPE has the actual type. */
4106 /* Did array size calculations overflow? */
4108 if (TREE_CODE (type) == ARRAY_TYPE
4109 && COMPLETE_TYPE_P (type)
4110 && TREE_OVERFLOW (TYPE_SIZE (type)))
4112 error ("size of array `%s' is too large", name);
4113 /* If we proceed with the array type as it is, we'll eventually
4114 crash in tree_low_cst(). */
4115 type = error_mark_node;
4118 /* If this is declaring a typedef name, return a TYPE_DECL. */
4120 if (specbits & (1 << (int) RID_TYPEDEF))
4123 /* Note that the grammar rejects storage classes
4124 in typenames, fields or parameters */
4125 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4127 pedwarn ("ISO C forbids qualified function types");
4129 type = c_build_qualified_type (type, type_quals);
4130 decl = build_decl (TYPE_DECL, declarator, type);
4131 if ((specbits & (1 << (int) RID_SIGNED))
4132 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4133 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4134 decl_attributes (&decl, returned_attrs, 0);
4138 /* Detect the case of an array type of unspecified size
4139 which came, as such, direct from a typedef name.
4140 We must copy the type, so that each identifier gets
4141 a distinct type, so that each identifier's size can be
4142 controlled separately by its own initializer. */
4144 if (type != 0 && typedef_type != 0
4145 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4146 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4148 type = build_array_type (TREE_TYPE (type), 0);
4150 C_TYPE_VARIABLE_SIZE (type) = 1;
4153 /* If this is a type name (such as, in a cast or sizeof),
4154 compute the type and return it now. */
4156 if (decl_context == TYPENAME)
4158 /* Note that the grammar rejects storage classes
4159 in typenames, fields or parameters */
4160 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4162 pedwarn ("ISO C forbids const or volatile function types");
4164 type = c_build_qualified_type (type, type_quals);
4165 decl_attributes (&type, returned_attrs, 0);
4169 /* Aside from typedefs and type names (handle above),
4170 `void' at top level (not within pointer)
4171 is allowed only in public variables.
4172 We don't complain about parms either, but that is because
4173 a better error message can be made later. */
4175 if (VOID_TYPE_P (type) && decl_context != PARM
4176 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4177 && ((specbits & (1 << (int) RID_EXTERN))
4178 || (current_scope == global_scope
4180 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4182 error ("variable or field `%s' declared void", name);
4183 type = integer_type_node;
4186 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4187 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4192 if (decl_context == PARM)
4194 tree type_as_written;
4197 /* A parameter declared as an array of T is really a pointer to T.
4198 One declared as a function is really a pointer to a function. */
4200 if (TREE_CODE (type) == ARRAY_TYPE)
4202 /* Transfer const-ness of array into that of type pointed to. */
4203 type = TREE_TYPE (type);
4205 type = c_build_qualified_type (type, type_quals);
4206 type = build_pointer_type (type);
4207 type_quals = TYPE_UNQUALIFIED;
4208 if (array_ptr_quals)
4210 tree new_ptr_quals, new_ptr_attrs;
4212 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4213 /* We don't yet implement attributes in this context. */
4214 if (new_ptr_attrs != NULL_TREE)
4215 warning ("attributes in parameter array declarator ignored");
4220 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4222 tree qualifier = TREE_VALUE (new_ptr_quals);
4224 if (C_IS_RESERVED_WORD (qualifier))
4226 if (C_RID_CODE (qualifier) == RID_CONST)
4228 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4230 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4240 error ("invalid type modifier within array declarator");
4242 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4243 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4244 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4248 else if (TREE_CODE (type) == FUNCTION_TYPE)
4250 if (pedantic && type_quals)
4251 pedwarn ("ISO C forbids qualified function types");
4253 type = c_build_qualified_type (type, type_quals);
4254 type = build_pointer_type (type);
4255 type_quals = TYPE_UNQUALIFIED;
4257 else if (type_quals)
4258 type = c_build_qualified_type (type, type_quals);
4260 type_as_written = type;
4262 decl = build_decl (PARM_DECL, declarator, type);
4264 C_DECL_VARIABLE_SIZE (decl) = 1;
4266 /* Compute the type actually passed in the parmlist,
4267 for the case where there is no prototype.
4268 (For example, shorts and chars are passed as ints.)
4269 When there is a prototype, this is overridden later. */
4271 if (type == error_mark_node)
4272 promoted_type = type;
4274 promoted_type = c_type_promotes_to (type);
4276 DECL_ARG_TYPE (decl) = promoted_type;
4277 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4279 else if (decl_context == FIELD)
4281 /* Structure field. It may not be a function. */
4283 if (TREE_CODE (type) == FUNCTION_TYPE)
4285 error ("field `%s' declared as a function", name);
4286 type = build_pointer_type (type);
4288 else if (TREE_CODE (type) != ERROR_MARK
4289 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4291 error ("field `%s' has incomplete type", name);
4292 type = error_mark_node;
4294 /* Move type qualifiers down to element of an array. */
4295 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4296 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4298 TYPE_DOMAIN (type));
4299 decl = build_decl (FIELD_DECL, declarator, type);
4300 DECL_NONADDRESSABLE_P (decl) = bitfield;
4303 C_DECL_VARIABLE_SIZE (decl) = 1;
4305 else if (TREE_CODE (type) == FUNCTION_TYPE)
4307 /* Every function declaration is "external"
4308 except for those which are inside a function body
4309 in which `auto' is used.
4310 That is a case not specified by ANSI C,
4311 and we use it for forward declarations for nested functions. */
4312 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4313 || current_scope == global_scope);
4315 if (specbits & (1 << (int) RID_AUTO)
4316 && (pedantic || current_scope == global_scope))
4317 pedwarn ("invalid storage class for function `%s'", name);
4318 if (specbits & (1 << (int) RID_REGISTER))
4319 error ("invalid storage class for function `%s'", name);
4320 if (specbits & (1 << (int) RID_THREAD))
4321 error ("invalid storage class for function `%s'", name);
4322 /* Function declaration not at file scope.
4323 Storage classes other than `extern' are not allowed
4324 and `extern' makes no difference. */
4325 if (current_scope != global_scope
4326 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4328 pedwarn ("invalid storage class for function `%s'", name);
4330 decl = build_decl (FUNCTION_DECL, declarator, type);
4331 decl = build_decl_attribute_variant (decl, decl_attr);
4333 DECL_LANG_SPECIFIC (decl)
4334 = ggc_alloc_cleared (sizeof (struct lang_decl));
4336 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4337 pedwarn ("ISO C forbids qualified function types");
4339 /* GNU C interprets a `volatile void' return type to indicate
4340 that the function does not return. */
4341 if ((type_quals & TYPE_QUAL_VOLATILE)
4342 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4343 warning ("`noreturn' function returns non-void value");
4346 DECL_EXTERNAL (decl) = 1;
4347 /* Record absence of global scope for `static' or `auto'. */
4349 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4352 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4354 /* Record presence of `inline', if it is reasonable. */
4355 if (MAIN_NAME_P (declarator))
4358 warning ("cannot inline function `main'");
4362 /* Record that the function is declared `inline'. */
4363 DECL_DECLARED_INLINE_P (decl) = 1;
4365 /* Do not mark bare declarations as DECL_INLINE. Doing so
4366 in the presence of multiple declarations can result in
4367 the abstract origin pointing between the declarations,
4368 which will confuse dwarf2out. */
4371 DECL_INLINE (decl) = 1;
4372 if (specbits & (1 << (int) RID_EXTERN))
4373 current_extern_inline = 1;
4376 /* If -finline-functions, assume it can be inlined. This does
4377 two things: let the function be deferred until it is actually
4378 needed, and let dwarf2 know that the function is inlinable. */
4379 else if (flag_inline_trees == 2 && initialized)
4380 DECL_INLINE (decl) = 1;
4384 /* It's a variable. */
4385 /* An uninitialized decl with `extern' is a reference. */
4386 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4388 /* Move type qualifiers down to element of an array. */
4389 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4391 int saved_align = TYPE_ALIGN(type);
4392 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4394 TYPE_DOMAIN (type));
4395 TYPE_ALIGN (type) = saved_align;
4397 else if (type_quals)
4398 type = c_build_qualified_type (type, type_quals);
4400 /* It is invalid to create an `extern' declaration for a
4401 variable if there is a global declaration that is
4403 if (extern_ref && current_scope != global_scope)
4407 global_decl = identifier_global_value (declarator);
4409 && TREE_CODE (global_decl) == VAR_DECL
4410 && !TREE_PUBLIC (global_decl))
4411 error ("variable previously declared `static' redeclared "
4415 decl = build_decl (VAR_DECL, declarator, type);
4417 C_DECL_VARIABLE_SIZE (decl) = 1;
4420 pedwarn ("%Jvariable '%D' declared `inline'", decl, decl);
4422 DECL_EXTERNAL (decl) = extern_ref;
4424 /* At file scope, the presence of a `static' or `register' storage
4425 class specifier, or the absence of all storage class specifiers
4426 makes this declaration a definition (perhaps tentative). Also,
4427 the absence of both `static' and `register' makes it public. */
4428 if (current_scope == global_scope)
4430 TREE_PUBLIC (decl) = !(specbits & ((1 << (int) RID_STATIC)
4431 | (1 << (int) RID_REGISTER)));
4432 TREE_STATIC (decl) = !extern_ref;
4434 /* Not at file scope, only `static' makes a static definition. */
4437 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4438 TREE_PUBLIC (decl) = extern_ref;
4441 if (specbits & 1 << (int) RID_THREAD)
4443 if (targetm.have_tls)
4444 DECL_THREAD_LOCAL (decl) = 1;
4446 /* A mere warning is sure to result in improper semantics
4447 at runtime. Don't bother to allow this to compile. */
4448 error ("thread-local storage not supported for this target");
4452 /* Record `register' declaration for warnings on &
4453 and in case doing stupid register allocation. */
4455 if (specbits & (1 << (int) RID_REGISTER))
4456 DECL_REGISTER (decl) = 1;
4458 /* Record constancy and volatility. */
4459 c_apply_type_quals_to_decl (type_quals, decl);
4461 /* If a type has volatile components, it should be stored in memory.
4462 Otherwise, the fact that those components are volatile
4463 will be ignored, and would even crash the compiler. */
4464 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4465 c_mark_addressable (decl);
4467 #ifdef ENABLE_CHECKING
4468 /* This is the earliest point at which we might know the assembler
4469 name of a variable. Thus, if it's known before this, die horribly. */
4470 if (DECL_ASSEMBLER_NAME_SET_P (decl))
4474 decl_attributes (&decl, returned_attrs, 0);
4480 /* Decode the parameter-list info for a function type or function definition.
4481 The argument is the value returned by `get_parm_info' (or made in parse.y
4482 if there is an identifier list instead of a parameter decl list).
4483 These two functions are separate because when a function returns
4484 or receives functions then each is called multiple times but the order
4485 of calls is different. The last call to `grokparms' is always the one
4486 that contains the formal parameter names of a function definition.
4488 Store in `last_function_parms' a chain of the decls of parms.
4489 Also store in `last_function_parm_tags' a chain of the struct, union,
4490 and enum tags declared among the parms.
4492 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4494 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4495 a mere declaration. A nonempty identifier-list gets an error message
4496 when FUNCDEF_FLAG is zero. */
4499 grokparms (tree parms_info, int funcdef_flag)
4501 tree first_parm = TREE_CHAIN (parms_info);
4503 last_function_parms = TREE_PURPOSE (parms_info);
4504 last_function_parm_tags = TREE_VALUE (parms_info);
4505 last_function_parm_others = TREE_TYPE (parms_info);
4507 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4508 && !in_system_header)
4509 warning ("function declaration isn't a prototype");
4512 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4515 pedwarn ("parameter names (without types) in function declaration");
4517 last_function_parms = first_parm;
4524 /* If the arg types are incomplete in a declaration,
4525 they must include undefined tags.
4526 These tags can never be defined in the scope of the declaration,
4527 so the types can never be completed,
4528 and no call can be compiled successfully. */
4530 for (parm = last_function_parms, typelt = first_parm;
4532 parm = TREE_CHAIN (parm))
4533 /* Skip over any enumeration constants declared here. */
4534 if (TREE_CODE (parm) == PARM_DECL)
4536 /* Barf if the parameter itself has an incomplete type. */
4537 tree type = TREE_VALUE (typelt);
4538 if (type == error_mark_node)
4540 if (!COMPLETE_TYPE_P (type))
4542 if (funcdef_flag && DECL_NAME (parm) != 0)
4543 error ("parameter `%s' has incomplete type",
4544 IDENTIFIER_POINTER (DECL_NAME (parm)));
4546 warning ("parameter has incomplete type");
4549 TREE_VALUE (typelt) = error_mark_node;
4550 TREE_TYPE (parm) = error_mark_node;
4553 typelt = TREE_CHAIN (typelt);
4560 /* Return a tree_list node with info on a parameter list just parsed.
4561 The TREE_PURPOSE is a list of decls of those parms.
4562 The TREE_VALUE is a list of structure, union and enum tags defined.
4563 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4564 The TREE_TYPE is a list of non-parameter decls which appeared with the
4566 This tree_list node is later fed to `grokparms'.
4568 VOID_AT_END nonzero means append `void' to the end of the type-list.
4569 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4572 get_parm_info (int void_at_end)
4574 tree decl, type, list;
4576 tree *last_type = &types;
4577 tree tags = current_scope->tags;
4578 tree parms = current_scope->parms;
4579 tree others = current_scope->names;
4580 static bool explained_incomplete_types = false;
4581 bool gave_void_only_once_err = false;
4583 /* Just "void" (and no ellipsis) is special. There are really no parms.
4584 But if the "void" is qualified (by "const" or "volatile"), or has a
4585 storage class specifier ("register"), then the behavior is undefined;
4586 issue an error. Typedefs for "void" are OK (see DR#157). */
4587 if (void_at_end && parms != 0
4588 && TREE_CHAIN (parms) == 0
4589 && VOID_TYPE_P (TREE_TYPE (parms))
4590 && !DECL_NAME (parms))
4592 if (TREE_THIS_VOLATILE (parms)
4593 || TREE_READONLY (parms)
4594 || DECL_REGISTER (parms))
4595 error ("\"void\" as only parameter may not be qualified");
4597 return tree_cons (0, 0, tree_cons (0, void_type_node, 0));
4600 /* Sanity check all of the parameter declarations. */
4601 for (decl = parms; decl; decl = TREE_CHAIN (decl))
4603 if (TREE_CODE (decl) != PARM_DECL)
4605 if (TREE_ASM_WRITTEN (decl))
4608 /* Since there is a prototype, args are passed in their
4609 declared types. The back end may override this. */
4610 type = TREE_TYPE (decl);
4611 DECL_ARG_TYPE (decl) = type;
4613 /* Check for (..., void, ...) and issue an error. */
4614 if (VOID_TYPE_P (type) && !DECL_NAME (decl) && !gave_void_only_once_err)
4616 error ("\"void\" must be the only parameter");
4617 gave_void_only_once_err = true;
4620 type = build_tree_list (0, type);
4622 last_type = &TREE_CHAIN (type);
4625 /* Check the list of non-parameter decls for any forward parm decls
4626 that never got real decls. */
4627 for (decl = others; decl; decl = TREE_CHAIN (decl))
4628 if (TREE_CODE (decl) == PARM_DECL)
4630 if (!TREE_ASM_WRITTEN (decl))
4633 error ("%Jparameter \"%D\" has just a forward declaration",
4637 /* Warn about any struct, union or enum tags defined within this
4638 list. The scope of such types is limited to this declaration,
4639 which is rarely if ever desirable (it's impossible to call such
4640 a function with type-correct arguments). */
4641 for (decl = tags; decl; decl = TREE_CHAIN (decl))
4643 enum tree_code code = TREE_CODE (TREE_VALUE (decl));
4644 const char *keyword;
4645 /* An anonymous union parm type is meaningful as a GNU extension.
4646 So don't warn for that. */
4647 if (code == UNION_TYPE && TREE_PURPOSE (decl) == 0 && !pedantic)
4650 /* The keyword should not be translated. */
4653 case RECORD_TYPE: keyword = "struct"; break;
4654 case UNION_TYPE: keyword = "union"; break;
4655 case ENUMERAL_TYPE: keyword = "enum"; break;
4659 if (TREE_PURPOSE (decl))
4660 /* The first %s will be one of 'struct', 'union', or 'enum'. */
4661 warning ("\"%s %s\" declared inside parameter list",
4662 keyword, IDENTIFIER_POINTER (TREE_PURPOSE (decl)));
4664 /* The %s will be one of 'struct', 'union', or 'enum'. */
4665 warning ("anonymous %s declared inside parameter list", keyword);
4667 if (! explained_incomplete_types)
4669 warning ("its scope is only this definition or declaration,"
4670 " which is probably not what you want");
4671 explained_incomplete_types = true;
4678 type = build_tree_list (0, void_type_node);
4682 list = tree_cons (parms, tags, types);
4683 TREE_TYPE (list) = others;
4687 /* Get the struct, enum or union (CODE says which) with tag NAME.
4688 Define the tag as a forward-reference if it is not defined. */
4691 xref_tag (enum tree_code code, tree name)
4693 /* If a cross reference is requested, look up the type
4694 already defined for this tag and return it. */
4696 tree ref = lookup_tag (code, name, 0);
4697 /* If this is the right type of tag, return what we found.
4698 (This reference will be shadowed by shadow_tag later if appropriate.)
4699 If this is the wrong type of tag, do not return it. If it was the
4700 wrong type in the same scope, we will have had an error
4701 message already; if in a different scope and declaring
4702 a name, pending_xref_error will give an error message; but if in a
4703 different scope and not declaring a name, this tag should
4704 shadow the previous declaration of a different type of tag, and
4705 this would not work properly if we return the reference found.
4706 (For example, with "struct foo" in an outer scope, "union foo;"
4707 must shadow that tag with a new one of union type.) */
4708 if (ref && TREE_CODE (ref) == code)
4711 /* If no such tag is yet defined, create a forward-reference node
4712 and record it as the "definition".
4713 When a real declaration of this type is found,
4714 the forward-reference will be altered into a real type. */
4716 ref = make_node (code);
4717 if (code == ENUMERAL_TYPE)
4719 /* Give the type a default layout like unsigned int
4720 to avoid crashing if it does not get defined. */
4721 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
4722 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
4723 TYPE_USER_ALIGN (ref) = 0;
4724 TREE_UNSIGNED (ref) = 1;
4725 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
4726 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
4727 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
4730 pushtag (name, ref);
4735 /* Make sure that the tag NAME is defined *in the current scope*
4736 at least as a forward reference.
4737 CODE says which kind of tag NAME ought to be. */
4740 start_struct (enum tree_code code, tree name)
4742 /* If there is already a tag defined at this scope
4743 (as a forward reference), just return it. */
4748 ref = lookup_tag (code, name, 1);
4749 if (ref && TREE_CODE (ref) == code)
4751 if (TYPE_FIELDS (ref))
4753 if (code == UNION_TYPE)
4754 error ("redefinition of `union %s'", IDENTIFIER_POINTER (name));
4756 error ("redefinition of `struct %s'", IDENTIFIER_POINTER (name));
4761 /* Otherwise create a forward-reference just so the tag is in scope. */
4763 ref = make_node (code);
4764 pushtag (name, ref);
4767 C_TYPE_BEING_DEFINED (ref) = 1;
4768 TYPE_PACKED (ref) = flag_pack_struct;
4772 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
4773 of a structure component, returning a FIELD_DECL node.
4774 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
4776 This is done during the parsing of the struct declaration.
4777 The FIELD_DECL nodes are chained together and the lot of them
4778 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
4781 grokfield (tree declarator, tree declspecs, tree width)
4785 if (declarator == NULL_TREE && width == NULL_TREE)
4787 /* This is an unnamed decl.
4789 If we have something of the form "union { list } ;" then this
4790 is the anonymous union extension. Similarly for struct.
4792 If this is something of the form "struct foo;", then
4793 If MS extensions are enabled, this is handled as an
4795 Otherwise this is a forward declaration of a structure tag.
4797 If this is something of the form "foo;" and foo is a TYPE_DECL, then
4798 If MS extensions are enabled and foo names a structure, then
4799 again this is an anonymous struct.
4800 Otherwise this is an error.
4802 Oh what a horrid tangled web we weave. I wonder if MS consciously
4803 took this from Plan 9 or if it was an accident of implementation
4804 that took root before someone noticed the bug... */
4806 tree type = TREE_VALUE (declspecs);
4808 if (flag_ms_extensions && TREE_CODE (type) == TYPE_DECL)
4809 type = TREE_TYPE (type);
4810 if (TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE)
4812 if (flag_ms_extensions)
4815 goto warn_unnamed_field;
4816 else if (TYPE_NAME (type) == NULL)
4819 goto warn_unnamed_field;
4824 warning ("declaration does not declare anything");
4829 value = grokdeclarator (declarator, declspecs, FIELD, 0,
4830 width ? &width : NULL);
4832 finish_decl (value, NULL_TREE, NULL_TREE);
4833 DECL_INITIAL (value) = width;
4838 /* Generate an error for any duplicate field names in FIELDLIST. Munge
4839 the list such that this does not present a problem later. */
4842 detect_field_duplicates (tree fieldlist)
4847 /* First, see if there are more than "a few" fields.
4848 This is trivially true if there are zero or one fields. */
4851 x = TREE_CHAIN (fieldlist);
4857 } while (timeout > 0 && x);
4859 /* If there were "few" fields, avoid the overhead of allocating
4860 a hash table. Instead just do the nested traversal thing. */
4863 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
4866 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
4867 if (DECL_NAME (y) == DECL_NAME (x))
4869 error ("%Jduplicate member '%D'", x, x);
4870 DECL_NAME (x) = NULL_TREE;
4876 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
4879 for (x = fieldlist; x ; x = TREE_CHAIN (x))
4880 if ((y = DECL_NAME (x)) != 0)
4882 slot = htab_find_slot (htab, y, INSERT);
4885 error ("%Jduplicate member '%D'", x, x);
4886 DECL_NAME (x) = NULL_TREE;
4895 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
4896 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
4897 ATTRIBUTES are attributes to be applied to the structure. */
4900 finish_struct (tree t, tree fieldlist, tree attributes)
4903 int toplevel = global_scope == current_scope;
4904 int saw_named_field;
4906 /* If this type was previously laid out as a forward reference,
4907 make sure we lay it out again. */
4911 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
4913 /* Nameless union parm types are useful as GCC extension. */
4914 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
4915 /* Otherwise, warn about any struct or union def. in parmlist. */
4916 if (in_parm_level_p ())
4919 pedwarn ("%s defined inside parms",
4920 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
4922 warning ("%s defined inside parms",
4923 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
4928 for (x = fieldlist; x; x = TREE_CHAIN (x))
4929 if (DECL_NAME (x) != 0)
4933 pedwarn ("%s has no %s",
4934 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
4935 fieldlist ? _("named members") : _("members"));
4938 /* Install struct as DECL_CONTEXT of each field decl.
4939 Also process specified field sizes,m which is found in the DECL_INITIAL.
4940 Store 0 there, except for ": 0" fields (so we can find them
4941 and delete them, below). */
4943 saw_named_field = 0;
4944 for (x = fieldlist; x; x = TREE_CHAIN (x))
4946 DECL_CONTEXT (x) = t;
4947 DECL_PACKED (x) |= TYPE_PACKED (t);
4949 /* If any field is const, the structure type is pseudo-const. */
4950 if (TREE_READONLY (x))
4951 C_TYPE_FIELDS_READONLY (t) = 1;
4954 /* A field that is pseudo-const makes the structure likewise. */
4955 tree t1 = TREE_TYPE (x);
4956 while (TREE_CODE (t1) == ARRAY_TYPE)
4957 t1 = TREE_TYPE (t1);
4958 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
4959 && C_TYPE_FIELDS_READONLY (t1))
4960 C_TYPE_FIELDS_READONLY (t) = 1;
4963 /* Any field that is volatile means variables of this type must be
4964 treated in some ways as volatile. */
4965 if (TREE_THIS_VOLATILE (x))
4966 C_TYPE_FIELDS_VOLATILE (t) = 1;
4968 /* Any field of nominal variable size implies structure is too. */
4969 if (C_DECL_VARIABLE_SIZE (x))
4970 C_TYPE_VARIABLE_SIZE (t) = 1;
4972 /* Detect invalid nested redefinition. */
4973 if (TREE_TYPE (x) == t)
4974 error ("nested redefinition of `%s'",
4975 IDENTIFIER_POINTER (TYPE_NAME (t)));
4977 if (DECL_INITIAL (x))
4979 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
4980 DECL_SIZE (x) = bitsize_int (width);
4981 DECL_BIT_FIELD (x) = 1;
4982 SET_DECL_C_BIT_FIELD (x);
4985 DECL_INITIAL (x) = 0;
4987 /* Detect flexible array member in an invalid context. */
4988 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
4989 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
4990 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
4991 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
4993 if (TREE_CODE (t) == UNION_TYPE)
4994 error ("%Jflexible array member in union", x);
4995 else if (TREE_CHAIN (x) != NULL_TREE)
4996 error ("%Jflexible array member not at end of struct", x);
4997 else if (! saw_named_field)
4998 error ("%Jflexible array member in otherwise empty struct", x);
5001 if (pedantic && TREE_CODE (t) == RECORD_TYPE
5002 && flexible_array_type_p (TREE_TYPE (x)))
5003 pedwarn ("%Jinvalid use of structure with flexible array member", x);
5006 saw_named_field = 1;
5009 detect_field_duplicates (fieldlist);
5011 /* Now we have the nearly final fieldlist. Record it,
5012 then lay out the structure or union (including the fields). */
5014 TYPE_FIELDS (t) = fieldlist;
5018 /* Delete all zero-width bit-fields from the fieldlist. */
5020 tree *fieldlistp = &fieldlist;
5022 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5023 *fieldlistp = TREE_CHAIN (*fieldlistp);
5025 fieldlistp = &TREE_CHAIN (*fieldlistp);
5028 /* Now we have the truly final field list.
5029 Store it in this type and in the variants. */
5031 TYPE_FIELDS (t) = fieldlist;
5033 /* If there are lots of fields, sort so we can look through them fast.
5034 We arbitrarily consider 16 or more elts to be "a lot". */
5039 for (x = fieldlist; x; x = TREE_CHAIN (x))
5041 if (len > 15 || DECL_NAME (x) == NULL)
5049 struct lang_type *space;
5050 struct sorted_fields_type *space2;
5052 len += list_length (x);
5054 /* Use the same allocation policy here that make_node uses, to
5055 ensure that this lives as long as the rest of the struct decl.
5056 All decls in an inline function need to be saved. */
5058 space = ggc_alloc (sizeof (struct lang_type));
5059 space2 = ggc_alloc (sizeof (struct sorted_fields_type) + len * sizeof (tree));
5063 field_array = &space2->elts[0];
5064 for (x = fieldlist; x; x = TREE_CHAIN (x))
5066 field_array[len++] = x;
5068 /* If there is anonymous struct or union, break out of the loop. */
5069 if (DECL_NAME (x) == NULL)
5072 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5075 TYPE_LANG_SPECIFIC (t) = space;
5076 TYPE_LANG_SPECIFIC (t)->s->len = len;
5077 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5078 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5083 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5085 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5086 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5087 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5088 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5091 /* If this was supposed to be a transparent union, but we can't
5092 make it one, warn and turn off the flag. */
5093 if (TREE_CODE (t) == UNION_TYPE
5094 && TYPE_TRANSPARENT_UNION (t)
5095 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5097 TYPE_TRANSPARENT_UNION (t) = 0;
5098 warning ("union cannot be made transparent");
5101 /* If this structure or union completes the type of any previous
5102 variable declaration, lay it out and output its rtl. */
5103 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5107 tree decl = TREE_VALUE (x);
5108 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5109 layout_array_type (TREE_TYPE (decl));
5110 if (TREE_CODE (decl) != TYPE_DECL)
5112 layout_decl (decl, 0);
5113 if (c_dialect_objc ())
5114 objc_check_decl (decl);
5115 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5120 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5122 /* Finish debugging output for this type. */
5123 rest_of_type_compilation (t, toplevel);
5128 /* Lay out the type T, and its element type, and so on. */
5131 layout_array_type (tree t)
5133 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5134 layout_array_type (TREE_TYPE (t));
5138 /* Begin compiling the definition of an enumeration type.
5139 NAME is its name (or null if anonymous).
5140 Returns the type object, as yet incomplete.
5141 Also records info about it so that build_enumerator
5142 may be used to declare the individual values as they are read. */
5145 start_enum (tree name)
5149 /* If this is the real definition for a previous forward reference,
5150 fill in the contents in the same object that used to be the
5151 forward reference. */
5154 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5156 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5158 enumtype = make_node (ENUMERAL_TYPE);
5159 pushtag (name, enumtype);
5162 C_TYPE_BEING_DEFINED (enumtype) = 1;
5164 if (TYPE_VALUES (enumtype) != 0)
5166 /* This enum is a named one that has been declared already. */
5167 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5169 /* Completely replace its old definition.
5170 The old enumerators remain defined, however. */
5171 TYPE_VALUES (enumtype) = 0;
5174 enum_next_value = integer_zero_node;
5177 if (flag_short_enums)
5178 TYPE_PACKED (enumtype) = 1;
5183 /* After processing and defining all the values of an enumeration type,
5184 install their decls in the enumeration type and finish it off.
5185 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5186 and ATTRIBUTES are the specified attributes.
5187 Returns ENUMTYPE. */
5190 finish_enum (tree enumtype, tree values, tree attributes)
5193 tree minnode = 0, maxnode = 0, enum_value_type;
5194 int precision, unsign;
5195 int toplevel = (global_scope == current_scope);
5197 if (in_parm_level_p ())
5198 warning ("enum defined inside parms");
5200 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5202 /* Calculate the maximum value of any enumerator in this type. */
5204 if (values == error_mark_node)
5205 minnode = maxnode = integer_zero_node;
5208 minnode = maxnode = TREE_VALUE (values);
5209 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5211 tree value = TREE_VALUE (pair);
5212 if (tree_int_cst_lt (maxnode, value))
5214 if (tree_int_cst_lt (value, minnode))
5219 /* Construct the final type of this enumeration. It is the same
5220 as one of the integral types - the narrowest one that fits, except
5221 that normally we only go as narrow as int - and signed iff any of
5222 the values are negative. */
5223 unsign = (tree_int_cst_sgn (minnode) >= 0);
5224 precision = MAX (min_precision (minnode, unsign),
5225 min_precision (maxnode, unsign));
5226 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5228 tree narrowest = c_common_type_for_size (precision, unsign);
5231 warning ("enumeration values exceed range of largest integer");
5232 narrowest = long_long_integer_type_node;
5235 precision = TYPE_PRECISION (narrowest);
5238 precision = TYPE_PRECISION (integer_type_node);
5240 if (precision == TYPE_PRECISION (integer_type_node))
5241 enum_value_type = c_common_type_for_size (precision, 0);
5243 enum_value_type = enumtype;
5245 TYPE_MIN_VALUE (enumtype) = minnode;
5246 TYPE_MAX_VALUE (enumtype) = maxnode;
5247 TYPE_PRECISION (enumtype) = precision;
5248 TREE_UNSIGNED (enumtype) = unsign;
5249 TYPE_SIZE (enumtype) = 0;
5250 layout_type (enumtype);
5252 if (values != error_mark_node)
5254 /* Change the type of the enumerators to be the enum type. We
5255 need to do this irrespective of the size of the enum, for
5256 proper type checking. Replace the DECL_INITIALs of the
5257 enumerators, and the value slots of the list, with copies
5258 that have the enum type; they cannot be modified in place
5259 because they may be shared (e.g. integer_zero_node) Finally,
5260 change the purpose slots to point to the names of the decls. */
5261 for (pair = values; pair; pair = TREE_CHAIN (pair))
5263 tree enu = TREE_PURPOSE (pair);
5265 TREE_TYPE (enu) = enumtype;
5267 /* The ISO C Standard mandates enumerators to have type int,
5268 even though the underlying type of an enum type is
5269 unspecified. Here we convert any enumerators that fit in
5270 an int to type int, to avoid promotions to unsigned types
5271 when comparing integers with enumerators that fit in the
5272 int range. When -pedantic is given, build_enumerator()
5273 would have already taken care of those that don't fit. */
5274 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5275 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5277 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5279 TREE_PURPOSE (pair) = DECL_NAME (enu);
5280 TREE_VALUE (pair) = DECL_INITIAL (enu);
5283 TYPE_VALUES (enumtype) = values;
5286 /* Fix up all variant types of this enum type. */
5287 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5289 if (tem == enumtype)
5291 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5292 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5293 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5294 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5295 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5296 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5297 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5298 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5299 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5300 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5303 /* Finish debugging output for this type. */
5304 rest_of_type_compilation (enumtype, toplevel);
5309 /* Build and install a CONST_DECL for one value of the
5310 current enumeration type (one that was begun with start_enum).
5311 Return a tree-list containing the CONST_DECL and its value.
5312 Assignment of sequential values by default is handled here. */
5315 build_enumerator (tree name, tree value)
5319 /* Validate and default VALUE. */
5321 /* Remove no-op casts from the value. */
5323 STRIP_TYPE_NOPS (value);
5327 if (TREE_CODE (value) == INTEGER_CST)
5329 value = default_conversion (value);
5330 constant_expression_warning (value);
5334 error ("enumerator value for `%s' not integer constant",
5335 IDENTIFIER_POINTER (name));
5340 /* Default based on previous value. */
5341 /* It should no longer be possible to have NON_LVALUE_EXPR
5345 value = enum_next_value;
5347 error ("overflow in enumeration values");
5350 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5352 pedwarn ("ISO C restricts enumerator values to range of `int'");
5353 value = convert (integer_type_node, value);
5356 /* Set basis for default for next value. */
5357 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5358 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5360 /* Now create a declaration for the enum value name. */
5362 type = TREE_TYPE (value);
5363 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5364 TYPE_PRECISION (integer_type_node)),
5365 (TYPE_PRECISION (type)
5366 >= TYPE_PRECISION (integer_type_node)
5367 && TREE_UNSIGNED (type)));
5369 decl = build_decl (CONST_DECL, name, type);
5370 DECL_INITIAL (decl) = convert (type, value);
5373 return tree_cons (decl, value, NULL_TREE);
5377 /* Create the FUNCTION_DECL for a function definition.
5378 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5379 the declaration; they describe the function's name and the type it returns,
5380 but twisted together in a fashion that parallels the syntax of C.
5382 This function creates a binding context for the function body
5383 as well as setting up the FUNCTION_DECL in current_function_decl.
5385 Returns 1 on success. If the DECLARATOR is not suitable for a function
5386 (it defines a datum instead), we return 0, which tells
5387 yyparse to report a parse error. */
5390 start_function (tree declspecs, tree declarator, tree attributes)
5392 tree decl1, old_decl;
5394 int old_immediate_size_expand = immediate_size_expand;
5396 current_function_returns_value = 0; /* Assume, until we see it does. */
5397 current_function_returns_null = 0;
5398 current_function_returns_abnormally = 0;
5399 warn_about_return_type = 0;
5400 current_extern_inline = 0;
5401 c_in_iteration_stmt = 0;
5404 /* Don't expand any sizes in the return type of the function. */
5405 immediate_size_expand = 0;
5407 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, NULL);
5409 /* If the declarator is not suitable for a function definition,
5410 cause a syntax error. */
5413 immediate_size_expand = old_immediate_size_expand;
5417 decl_attributes (&decl1, attributes, 0);
5419 if (DECL_DECLARED_INLINE_P (decl1)
5420 && DECL_UNINLINABLE (decl1)
5421 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5422 warning ("%Jinline function '%D' given attribute noinline", decl1, decl1);
5424 announce_function (decl1);
5426 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5428 error ("return type is an incomplete type");
5429 /* Make it return void instead. */
5431 = build_function_type (void_type_node,
5432 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5435 if (warn_about_return_type)
5436 pedwarn_c99 ("return type defaults to `int'");
5438 /* Save the parm names or decls from this function's declarator
5439 where store_parm_decls will find them. */
5440 current_function_parms = last_function_parms;
5441 current_function_parm_tags = last_function_parm_tags;
5442 current_function_parm_others = last_function_parm_others;
5444 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5445 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5446 DECL_INITIAL (decl1) = error_mark_node;
5448 /* If this definition isn't a prototype and we had a prototype declaration
5449 before, copy the arg type info from that prototype.
5450 But not if what we had before was a builtin function. */
5451 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5452 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5453 && !DECL_BUILT_IN (old_decl)
5454 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5455 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5456 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5458 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5459 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
5462 /* Optionally warn of old-fashioned def with no previous prototype. */
5463 if (warn_strict_prototypes
5464 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5465 && C_DECL_ISNT_PROTOTYPE (old_decl))
5466 warning ("function declaration isn't a prototype");
5467 /* Optionally warn of any global def with no previous prototype. */
5468 else if (warn_missing_prototypes
5469 && TREE_PUBLIC (decl1)
5470 && ! MAIN_NAME_P (DECL_NAME (decl1))
5471 && C_DECL_ISNT_PROTOTYPE (old_decl))
5472 warning ("%Jno previous prototype for '%D'", decl1, decl1);
5473 /* Optionally warn of any def with no previous prototype
5474 if the function has already been used. */
5475 else if (warn_missing_prototypes
5476 && old_decl != 0 && TREE_USED (old_decl)
5477 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5478 warning ("%J'%D' was used with no prototype before its definition",
5480 /* Optionally warn of any global def with no previous declaration. */
5481 else if (warn_missing_declarations
5482 && TREE_PUBLIC (decl1)
5484 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5485 warning ("%Jno previous declaration for '%D'", decl1, decl1);
5486 /* Optionally warn of any def with no previous declaration
5487 if the function has already been used. */
5488 else if (warn_missing_declarations
5489 && old_decl != 0 && TREE_USED (old_decl)
5490 && C_DECL_IMPLICIT (old_decl))
5491 warning ("%J`%D' was used with no declaration before its definition",
5494 /* This is a definition, not a reference.
5495 So normally clear DECL_EXTERNAL.
5496 However, `extern inline' acts like a declaration
5497 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5498 DECL_EXTERNAL (decl1) = current_extern_inline;
5500 /* This function exists in static storage.
5501 (This does not mean `static' in the C sense!) */
5502 TREE_STATIC (decl1) = 1;
5504 /* A nested function is not global. */
5505 if (current_function_decl != 0)
5506 TREE_PUBLIC (decl1) = 0;
5508 #ifdef ENABLE_CHECKING
5509 /* This is the earliest point at which we might know the assembler
5510 name of the function. Thus, if it's set before this, die horribly. */
5511 if (DECL_ASSEMBLER_NAME_SET_P (decl1))
5515 /* If #pragma weak was used, mark the decl weak now. */
5516 if (current_scope == global_scope)
5517 maybe_apply_pragma_weak (decl1);
5519 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5520 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5525 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5526 != integer_type_node)
5527 pedwarn ("%Jreturn type of '%D' is not `int'", decl1, decl1);
5529 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5530 args = TREE_CHAIN (args))
5532 tree type = args ? TREE_VALUE (args) : 0;
5534 if (type == void_type_node)
5541 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5542 pedwarn ("%Jfirst argument of '%D' should be `int'",
5547 if (TREE_CODE (type) != POINTER_TYPE
5548 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5549 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5551 pedwarn ("%Jsecond argument of '%D' should be 'char **'",
5556 if (TREE_CODE (type) != POINTER_TYPE
5557 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5558 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5560 pedwarn ("%Jthird argument of '%D' should probably be "
5561 "'char **'", decl1, decl1);
5566 /* It is intentional that this message does not mention the third
5567 argument because it's only mentioned in an appendix of the
5569 if (argct > 0 && (argct < 2 || argct > 3))
5570 pedwarn ("%J'%D' takes only zero or two arguments", decl1, decl1);
5572 if (! TREE_PUBLIC (decl1))
5573 pedwarn ("%J'%D' is normally a non-static function", decl1, decl1);
5576 /* Record the decl so that the function name is defined.
5577 If we already have a decl for this name, and it is a FUNCTION_DECL,
5578 use the old decl. */
5580 current_function_decl = pushdecl (decl1);
5583 declare_parm_level ();
5585 make_decl_rtl (current_function_decl, NULL);
5587 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5588 /* Promote the value to int before returning it. */
5589 if (c_promoting_integer_type_p (restype))
5591 /* It retains unsignedness if not really getting wider. */
5592 if (TREE_UNSIGNED (restype)
5593 && (TYPE_PRECISION (restype)
5594 == TYPE_PRECISION (integer_type_node)))
5595 restype = unsigned_type_node;
5597 restype = integer_type_node;
5599 DECL_RESULT (current_function_decl)
5600 = build_decl (RESULT_DECL, NULL_TREE, restype);
5602 /* If this fcn was already referenced via a block-scope `extern' decl
5603 (or an implicit decl), propagate certain information about the usage. */
5604 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
5605 TREE_ADDRESSABLE (current_function_decl) = 1;
5607 immediate_size_expand = old_immediate_size_expand;
5609 start_fname_decls ();
5614 /* Subroutine of store_parm_decls which handles new-style function
5615 definitions (prototype format). The parms already have decls, so we
5616 need only record them as in effect and complain if any redundant
5617 old-style parm decls were written. */
5619 store_parm_decls_newstyle (void)
5622 tree fndecl = current_function_decl;
5623 tree parms = current_function_parms;
5624 tree tags = current_function_parm_tags;
5625 tree others = current_function_parm_others;
5627 if (current_scope->parms || current_scope->names || current_scope->tags)
5629 error ("%Jold-style parameter declarations in prototyped "
5630 "function definition", fndecl);
5632 /* Get rid of the old-style declarations. */
5637 /* Now make all the parameter declarations visible in the function body.
5638 We can bypass most of the grunt work of pushdecl. */
5639 for (last = 0, decl = parms; decl; last = decl, decl = TREE_CHAIN (decl))
5641 DECL_CONTEXT (decl) = current_function_decl;
5642 if (DECL_NAME (decl) == 0)
5643 error ("%Jparameter name omitted", decl);
5646 if (IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)))
5647 current_scope->shadowed
5648 = tree_cons (DECL_NAME (decl),
5649 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)),
5650 current_scope->shadowed);
5651 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)) = decl;
5654 current_scope->parms = parms;
5655 current_scope->parms_last = last;
5657 /* Record the parameter list in the function declaration. */
5658 DECL_ARGUMENTS (fndecl) = parms;
5660 /* Now make all the ancillary declarations visible, likewise. */
5661 for (last = 0, decl = others; decl; last = decl, decl = TREE_CHAIN (decl))
5663 DECL_CONTEXT (decl) = current_function_decl;
5664 if (DECL_NAME (decl)
5665 && TYPE_MAIN_VARIANT (TREE_TYPE (decl)) != void_type_node)
5667 if (IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)))
5668 current_scope->shadowed
5669 = tree_cons (DECL_NAME (decl),
5670 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)),
5671 current_scope->shadowed);
5672 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)) = decl;
5675 current_scope->names = others;
5676 current_scope->names_last = last;
5678 /* And all the tag declarations. */
5679 for (decl = tags; decl; decl = TREE_CHAIN (decl))
5680 if (TREE_PURPOSE (decl))
5682 if (IDENTIFIER_TAG_VALUE (TREE_PURPOSE (decl)))
5683 current_scope->shadowed_tags
5684 = tree_cons (TREE_PURPOSE (decl),
5685 IDENTIFIER_SYMBOL_VALUE (TREE_PURPOSE (decl)),
5686 current_scope->shadowed_tags);
5687 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (decl)) = TREE_VALUE (decl);
5689 current_scope->tags = tags;
5692 /* Subroutine of store_parm_decls which handles old-style function
5693 definitions (separate parameter list and declarations). */
5696 store_parm_decls_oldstyle (void)
5698 tree parm, decl, last;
5699 tree fndecl = current_function_decl;
5701 /* This is the identifier list from the function declarator. */
5702 tree parmids = current_function_parms;
5704 /* We use DECL_WEAK as a flag to show which parameters have been
5705 seen already, since it is not used on PARM_DECL. */
5706 #ifdef ENABLE_CHECKING
5707 for (parm = current_scope->parms; parm; parm = TREE_CHAIN (parm))
5708 if (DECL_WEAK (parm))
5712 /* Match each formal parameter name with its declaration. Save each
5713 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
5714 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
5716 if (TREE_VALUE (parm) == 0)
5718 error ("%Jparameter name missing from parameter list", fndecl);
5719 TREE_PURPOSE (parm) = 0;
5723 decl = IDENTIFIER_SYMBOL_VALUE (TREE_VALUE (parm));
5724 if (decl && DECL_CONTEXT (decl) == fndecl)
5726 /* If we got something other than a PARM_DECL it is an error. */
5727 if (TREE_CODE (decl) != PARM_DECL)
5728 error ("%J\"%D\" declared as a non-parameter", decl, decl);
5729 /* If the declaration is already marked, we have a duplicate
5730 name. Complain and ignore the duplicate. */
5731 else if (DECL_WEAK (decl))
5733 error ("%Jmultiple parameters named \"%D\"", decl, decl);
5734 TREE_PURPOSE (parm) = 0;
5737 /* If the declaration says "void", complain and turn it into
5739 else if (VOID_TYPE_P (TREE_TYPE (decl)))
5741 error ("%Jparameter \"%D\" declared void", decl, decl);
5742 TREE_TYPE (decl) = integer_type_node;
5743 DECL_ARG_TYPE (decl) = integer_type_node;
5744 layout_decl (decl, 0);
5747 /* If no declaration found, default to int. */
5750 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
5751 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
5752 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
5756 pedwarn ("%Jtype of \"%D\" defaults to \"int\"", decl, decl);
5757 else if (extra_warnings)
5758 warning ("%Jtype of \"%D\" defaults to \"int\"", decl, decl);
5761 TREE_PURPOSE (parm) = decl;
5762 DECL_WEAK (decl) = 1;
5765 /* Now examine the parms chain for incomplete declarations
5766 and declarations with no corresponding names. */
5768 for (parm = current_scope->parms; parm; parm = TREE_CHAIN (parm))
5770 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
5772 error ("%Jparameter \"%D\" has incomplete type", parm, parm);
5773 TREE_TYPE (parm) = error_mark_node;
5776 if (! DECL_WEAK (parm))
5778 error ("%Jdeclaration for parameter \"%D\" but no such parameter",
5781 /* Pretend the parameter was not missing.
5782 This gets us to a standard state and minimizes
5783 further error messages. */
5784 parmids = chainon (parmids, tree_cons (parm, 0, 0));
5788 /* Chain the declarations together in the order of the list of
5789 names. Store that chain in the function decl, replacing the
5790 list of names. Update the current scope to match. */
5791 DECL_ARGUMENTS (fndecl) = 0;
5793 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
5794 if (TREE_PURPOSE (parm))
5796 if (parm && TREE_PURPOSE (parm))
5798 last = TREE_PURPOSE (parm);
5799 DECL_ARGUMENTS (fndecl) = last;
5800 current_scope->parms = last;
5801 DECL_WEAK (last) = 0;
5803 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
5804 if (TREE_PURPOSE (parm))
5806 TREE_CHAIN (last) = TREE_PURPOSE (parm);
5807 last = TREE_PURPOSE (parm);
5808 DECL_WEAK (last) = 0;
5810 current_scope->parms_last = last;
5811 TREE_CHAIN (last) = 0;
5814 /* If there was a previous prototype,
5815 set the DECL_ARG_TYPE of each argument according to
5816 the type previously specified, and report any mismatches. */
5818 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
5821 for (parm = DECL_ARGUMENTS (fndecl),
5822 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
5823 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
5824 != void_type_node));
5825 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
5827 if (parm == 0 || type == 0
5828 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
5830 error ("number of arguments doesn't match prototype");
5831 error ("%Hprototype declaration",
5832 ¤t_function_prototype_locus);
5835 /* Type for passing arg must be consistent with that
5836 declared for the arg. ISO C says we take the unqualified
5837 type for parameters declared with qualified type. */
5838 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
5839 TYPE_MAIN_VARIANT (TREE_VALUE (type)),
5842 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
5843 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
5845 /* Adjust argument to match prototype. E.g. a previous
5846 `int foo(float);' prototype causes
5847 `int foo(x) float x; {...}' to be treated like
5848 `int foo(float x) {...}'. This is particularly
5849 useful for argument types like uid_t. */
5850 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
5852 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
5853 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
5854 && TYPE_PRECISION (TREE_TYPE (parm))
5855 < TYPE_PRECISION (integer_type_node))
5856 DECL_ARG_TYPE (parm) = integer_type_node;
5860 pedwarn ("promoted argument \"%D\" "
5861 "doesn't match prototype", parm);
5862 pedwarn ("%Hprototype declaration",
5863 ¤t_function_prototype_locus);
5868 error ("argument \"%D\" doesn't match prototype", parm);
5869 error ("%Hprototype declaration",
5870 ¤t_function_prototype_locus);
5874 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
5877 /* Otherwise, create a prototype that would match. */
5881 tree actual = 0, last = 0, type;
5883 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
5885 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
5887 TREE_CHAIN (last) = type;
5892 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
5894 TREE_CHAIN (last) = type;
5898 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
5899 of the type of this function, but we need to avoid having this
5900 affect the types of other similarly-typed functions, so we must
5901 first force the generation of an identical (but separate) type
5902 node for the relevant function type. The new node we create
5903 will be a variant of the main variant of the original function
5906 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
5908 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
5912 /* Store the parameter declarations into the current function declaration.
5913 This is called after parsing the parameter declarations, before
5914 digesting the body of the function.
5916 For an old-style definition, construct a prototype out of the old-style
5917 parameter declarations and inject it into the function's type. */
5920 store_parm_decls (void)
5922 tree fndecl = current_function_decl;
5924 /* The function containing FNDECL, if any. */
5925 tree context = decl_function_context (fndecl);
5927 /* True if this definition is written with a prototype. */
5928 bool prototype = (current_function_parms
5929 && TREE_CODE (current_function_parms) != TREE_LIST);
5932 store_parm_decls_newstyle ();
5934 store_parm_decls_oldstyle ();
5936 /* The next call to pushlevel will be a function body. */
5938 next_is_function_body = true;
5940 /* Write a record describing this function definition to the prototypes
5941 file (if requested). */
5943 gen_aux_info_record (fndecl, 1, 0, prototype);
5945 /* Initialize the RTL code for the function. */
5946 allocate_struct_function (fndecl);
5948 /* Begin the statement tree for this function. */
5949 begin_stmt_tree (&DECL_SAVED_TREE (fndecl));
5951 /* If this is a nested function, save away the sizes of any
5952 variable-size types so that we can expand them when generating
5958 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
5959 = nreverse (get_pending_sizes ());
5960 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
5963 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
5966 /* This function is being processed in whole-function mode. */
5967 cfun->x_whole_function_mode_p = 1;
5969 /* Even though we're inside a function body, we still don't want to
5970 call expand_expr to calculate the size of a variable-sized array.
5971 We haven't necessarily assigned RTL to all variables yet, so it's
5972 not safe to try to expand expressions involving them. */
5973 immediate_size_expand = 0;
5974 cfun->x_dont_save_pending_sizes_p = 1;
5977 /* Finish up a function declaration and compile that function
5978 all the way to assembler language output. The free the storage
5979 for the function definition.
5981 This is called after parsing the body of the function definition. */
5984 finish_function (void)
5986 tree fndecl = current_function_decl;
5988 /* When a function declaration is totally empty, e.g.
5990 (the argument list is irrelevant) the compstmt rule will not
5991 bother calling pushlevel/poplevel, which means we get here with
5992 the scope stack out of sync. Detect this situation by noticing
5993 that current_scope is still as store_parm_decls left it, and do
5994 a dummy push/pop to get back to consistency.
5995 Note that the call to pushlevel does not actually push another
5996 scope - see there for details. */
5998 if (current_scope->parm_flag && next_is_function_body)
6004 if (TREE_CODE (fndecl) == FUNCTION_DECL
6005 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6007 tree args = DECL_ARGUMENTS (fndecl);
6008 for (; args; args = TREE_CHAIN (args))
6010 tree type = TREE_TYPE (args);
6011 if (INTEGRAL_TYPE_P (type)
6012 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6013 DECL_ARG_TYPE (args) = integer_type_node;
6017 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6018 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6020 /* Must mark the RESULT_DECL as being in this function. */
6022 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
6023 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6025 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6027 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6028 != integer_type_node)
6030 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6031 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6033 pedwarn ("%Jreturn type of '%D' is not `int'", fndecl, fndecl);
6037 #ifdef DEFAULT_MAIN_RETURN
6038 /* Make it so that `main' always returns success by default. */
6039 DEFAULT_MAIN_RETURN;
6042 c_expand_return (integer_zero_node);
6047 finish_fname_decls ();
6049 /* Tie off the statement tree for this function. */
6050 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6052 /* Complain if there's just no return statement. */
6053 if (warn_return_type
6054 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6055 && !current_function_returns_value && !current_function_returns_null
6056 /* Don't complain if we abort. */
6057 && !current_function_returns_abnormally
6058 /* Don't warn for main(). */
6059 && !MAIN_NAME_P (DECL_NAME (fndecl))
6060 /* Or if they didn't actually specify a return type. */
6061 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6062 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6063 inline function, as we might never be compiled separately. */
6064 && DECL_INLINE (fndecl))
6065 warning ("no return statement in function returning non-void");
6067 /* With just -Wextra, complain only if function returns both with
6068 and without a value. */
6070 && current_function_returns_value
6071 && current_function_returns_null)
6072 warning ("this function may return with or without a value");
6074 /* We're leaving the context of this function, so zap cfun. It's still in
6075 DECL_SAVED_INSNS, and we'll restore it in tree_rest_of_compilation. */
6078 /* ??? Objc emits functions after finalizing the compilation unit.
6079 This should be cleaned up later and this conditional removed. */
6080 if (!cgraph_global_info_ready)
6081 cgraph_finalize_function (fndecl, false);
6083 c_expand_body (fndecl);
6084 current_function_decl = NULL;
6087 /* Generate the RTL for a deferred function FNDECL. */
6090 c_expand_deferred_function (tree fndecl)
6092 /* DECL_INLINE or DECL_RESULT might got cleared after the inline
6093 function was deferred, e.g. in duplicate_decls. */
6094 if (DECL_INLINE (fndecl) && DECL_RESULT (fndecl))
6096 if (flag_inline_trees)
6098 timevar_push (TV_INTEGRATION);
6099 optimize_inline_calls (fndecl);
6100 timevar_pop (TV_INTEGRATION);
6102 c_expand_body (fndecl);
6103 current_function_decl = NULL;
6107 /* Generate the RTL for the body of FNDECL. If NESTED_P is nonzero,
6108 then we are already in the process of generating RTL for another
6112 c_expand_body_1 (tree fndecl, int nested_p)
6116 /* Make sure that we will evaluate variable-sized types involved
6117 in our function's type. */
6118 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6120 /* Squirrel away our current state. */
6121 push_function_context ();
6124 tree_rest_of_compilation (fndecl, nested_p);
6127 /* Return to the enclosing function. */
6128 pop_function_context ();
6130 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6132 if (targetm.have_ctors_dtors)
6133 (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
6134 DEFAULT_INIT_PRIORITY);
6136 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6139 if (DECL_STATIC_DESTRUCTOR (fndecl))
6141 if (targetm.have_ctors_dtors)
6142 (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
6143 DEFAULT_INIT_PRIORITY);
6145 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6149 /* Like c_expand_body_1 but only for unnested functions. */
6152 c_expand_body (tree fndecl)
6155 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6156 c_expand_body_1 (fndecl, 0);
6159 /* Check the declarations given in a for-loop for satisfying the C99
6162 check_for_loop_decls (void)
6168 /* If we get here, declarations have been used in a for loop without
6169 the C99 for loop scope. This doesn't make much sense, so don't
6171 error ("'for' loop initial declaration used outside C99 mode");
6174 /* C99 subclause 6.8.5 paragraph 3:
6176 [#3] The declaration part of a for statement shall only
6177 declare identifiers for objects having storage class auto or
6180 It isn't clear whether, in this sentence, "identifiers" binds to
6181 "shall only declare" or to "objects" - that is, whether all identifiers
6182 declared must be identifiers for objects, or whether the restriction
6183 only applies to those that are. (A question on this in comp.std.c
6184 in November 2000 received no answer.) We implement the strictest
6185 interpretation, to avoid creating an extension which later causes
6188 for (t = current_scope->tags; t; t = TREE_CHAIN (t))
6190 if (TREE_PURPOSE (t) != 0)
6192 enum tree_code code = TREE_CODE (TREE_VALUE (t));
6194 if (code == RECORD_TYPE)
6195 error ("'struct %s' declared in 'for' loop initial declaration",
6196 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6197 else if (code == UNION_TYPE)
6198 error ("'union %s' declared in 'for' loop initial declaration",
6199 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6201 error ("'enum %s' declared in 'for' loop initial declaration",
6202 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6206 for (t = getdecls (); t; t = TREE_CHAIN (t))
6208 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
6209 error ("%Jdeclaration of non-variable '%D' in 'for' loop "
6210 "initial declaration", t, t);
6211 else if (TREE_STATIC (t))
6212 error ("%Jdeclaration of static variable '%D' in 'for' loop "
6213 "initial declaration", t, t);
6214 else if (DECL_EXTERNAL (t))
6215 error ("%Jdeclaration of 'extern' variable '%D' in 'for' loop "
6216 "initial declaration", t, t);
6220 /* Save and reinitialize the variables
6221 used during compilation of a C function. */
6224 c_push_function_context (struct function *f)
6226 struct language_function *p;
6227 p = ggc_alloc (sizeof (struct language_function));
6230 p->base.x_stmt_tree = c_stmt_tree;
6231 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
6232 p->x_in_iteration_stmt = c_in_iteration_stmt;
6233 p->x_in_case_stmt = c_in_case_stmt;
6234 p->returns_value = current_function_returns_value;
6235 p->returns_null = current_function_returns_null;
6236 p->returns_abnormally = current_function_returns_abnormally;
6237 p->warn_about_return_type = warn_about_return_type;
6238 p->extern_inline = current_extern_inline;
6241 /* Restore the variables used during compilation of a C function. */
6244 c_pop_function_context (struct function *f)
6246 struct language_function *p = f->language;
6248 if (DECL_SAVED_INSNS (current_function_decl) == 0
6249 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6251 /* Stop pointing to the local nodes about to be freed. */
6252 /* But DECL_INITIAL must remain nonzero so we know this
6253 was an actual function definition. */
6254 DECL_INITIAL (current_function_decl) = error_mark_node;
6255 DECL_ARGUMENTS (current_function_decl) = 0;
6258 c_stmt_tree = p->base.x_stmt_tree;
6259 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
6260 c_in_iteration_stmt = p->x_in_iteration_stmt;
6261 c_in_case_stmt = p->x_in_case_stmt;
6262 current_function_returns_value = p->returns_value;
6263 current_function_returns_null = p->returns_null;
6264 current_function_returns_abnormally = p->returns_abnormally;
6265 warn_about_return_type = p->warn_about_return_type;
6266 current_extern_inline = p->extern_inline;
6271 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6274 c_dup_lang_specific_decl (tree decl)
6276 struct lang_decl *ld;
6278 if (!DECL_LANG_SPECIFIC (decl))
6281 ld = ggc_alloc (sizeof (struct lang_decl));
6282 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6283 DECL_LANG_SPECIFIC (decl) = ld;
6286 /* The functions below are required for functionality of doing
6287 function at once processing in the C front end. Currently these
6288 functions are not called from anywhere in the C front end, but as
6289 these changes continue, that will change. */
6291 /* Returns nonzero if the current statement is a full expression,
6292 i.e. temporaries created during that statement should be destroyed
6293 at the end of the statement. */
6296 stmts_are_full_exprs_p (void)
6301 /* Returns the stmt_tree (if any) to which statements are currently
6302 being added. If there is no active statement-tree, NULL is
6306 current_stmt_tree (void)
6308 return &c_stmt_tree;
6311 /* Returns the stack of SCOPE_STMTs for the current function. */
6314 current_scope_stmt_stack (void)
6316 return &c_scope_stmt_stack;
6319 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6323 anon_aggr_type_p (tree node ATTRIBUTE_UNUSED)
6328 /* Dummy function in place of callback used by C++. */
6331 extract_interface_info (void)
6335 /* Return a new COMPOUND_STMT, after adding it to the current
6339 c_begin_compound_stmt (void)
6343 /* Create the COMPOUND_STMT. */
6344 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
6349 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
6353 c_expand_decl_stmt (tree t)
6355 tree decl = DECL_STMT_DECL (t);
6357 /* Expand nested functions. */
6358 if (TREE_CODE (decl) == FUNCTION_DECL
6359 && DECL_CONTEXT (decl) == current_function_decl
6360 && DECL_SAVED_TREE (decl))
6361 c_expand_body_1 (decl, 1);
6364 /* Return the global value of T as a symbol. */
6367 identifier_global_value (tree t)
6369 tree decl = IDENTIFIER_SYMBOL_VALUE (t);
6370 if (decl == 0 || DECL_FILE_SCOPE_P (decl))
6373 /* Shadowed by something else; find the true global value. */
6374 for (decl = global_scope->names; decl; decl = TREE_CHAIN (decl))
6375 if (DECL_NAME (decl) == t)
6378 /* Only local values for this decl. */
6382 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6383 otherwise the name is found in ridpointers from RID_INDEX. */
6386 record_builtin_type (enum rid rid_index, const char *name, tree type)
6390 id = ridpointers[(int) rid_index];
6392 id = get_identifier (name);
6393 pushdecl (build_decl (TYPE_DECL, id, type));
6396 /* Build the void_list_node (void_type_node having been created). */
6398 build_void_list_node (void)
6400 tree t = build_tree_list (NULL_TREE, void_type_node);
6404 /* Return something to represent absolute declarators containing a *.
6405 TARGET is the absolute declarator that the * contains.
6406 TYPE_QUALS_ATTRS is a list of modifiers such as const or volatile
6407 to apply to the pointer type, represented as identifiers, possible mixed
6410 We return an INDIRECT_REF whose "contents" are TARGET (inside a TREE_LIST,
6411 if attributes are present) and whose type is the modifier list. */
6414 make_pointer_declarator (tree type_quals_attrs, tree target)
6417 tree itarget = target;
6418 split_specs_attrs (type_quals_attrs, &quals, &attrs);
6419 if (attrs != NULL_TREE)
6420 itarget = tree_cons (attrs, target, NULL_TREE);
6421 return build1 (INDIRECT_REF, quals, itarget);
6424 /* A wrapper around lhd_set_decl_assembler_name that gives static
6425 variables their C names if they are at file scope and only one
6426 translation unit is being compiled, for backwards compatibility
6427 with certain bizarre assembler hacks (like crtstuff.c). */
6430 c_static_assembler_name (tree decl)
6432 if (num_in_fnames == 1
6433 && !TREE_PUBLIC (decl) && DECL_CONTEXT (decl)
6434 && TREE_CODE (DECL_CONTEXT (decl)) == TRANSLATION_UNIT_DECL)
6435 SET_DECL_ASSEMBLER_NAME (decl, DECL_NAME (decl));
6437 lhd_set_decl_assembler_name (decl);
6440 /* Hash and equality functions for link_hash_table: key off
6441 DECL_ASSEMBLER_NAME. */
6444 link_hash_hash (const void *x_p)
6447 return (hashval_t) (long)DECL_ASSEMBLER_NAME (x);
6451 link_hash_eq (const void *x1_p, const void *x2_p)
6453 tree x1 = (tree)x1_p;
6454 tree x2 = (tree)x2_p;
6455 return DECL_ASSEMBLER_NAME (x1) == DECL_ASSEMBLER_NAME (x2);
6458 /* Propagate information between definitions and uses between multiple
6459 translation units in TU_LIST based on linkage rules. */
6462 merge_translation_unit_decls (void)
6464 const tree tu_list = current_file_decl;
6467 htab_t link_hash_table;
6470 /* Create the BLOCK that poplevel would have created, but don't
6471 actually call poplevel since that's expensive. */
6472 block = make_node (BLOCK);
6473 BLOCK_VARS (block) = current_scope->names;
6474 TREE_USED (block) = 1;
6475 DECL_INITIAL (current_file_decl) = block;
6477 /* If only one translation unit seen, no copying necessary. */
6478 if (TREE_CHAIN (tu_list) == NULL_TREE)
6481 link_hash_table = htab_create (1021, link_hash_hash, link_hash_eq, NULL);
6483 /* Enter any actual definitions into the hash table. */
6484 for (tu = tu_list; tu; tu = TREE_CHAIN (tu))
6485 for (decl = BLOCK_VARS (DECL_INITIAL (tu)); decl; decl = TREE_CHAIN (decl))
6486 if (TREE_PUBLIC (decl) && ! DECL_EXTERNAL (decl))
6489 slot = htab_find_slot (link_hash_table, decl, INSERT);
6491 /* If we've already got a definition, work out which one is
6492 the real one, put it into the hash table, and make the
6493 other one DECL_EXTERNAL. This is important to avoid
6494 putting out two definitions of the same symbol in the
6498 tree old_decl = (tree) *slot;
6500 /* If this is weak or common or whatever, suppress it
6501 in favor of the other definition. */
6502 if (DECL_WEAK (decl))
6503 DECL_EXTERNAL (decl) = 1;
6504 else if (DECL_WEAK (old_decl) && ! DECL_WEAK (decl))
6505 DECL_EXTERNAL (old_decl) = 1;
6506 else if (DECL_COMMON (decl) || DECL_ONE_ONLY (decl))
6507 DECL_EXTERNAL (decl) = 1;
6508 else if (DECL_COMMON (old_decl) || DECL_ONE_ONLY (old_decl))
6509 DECL_EXTERNAL (old_decl) = 1;
6511 if (DECL_EXTERNAL (decl))
6513 DECL_INITIAL (decl) = NULL_TREE;
6514 DECL_COMMON (decl) = 0;
6515 DECL_ONE_ONLY (decl) = 0;
6516 DECL_WEAK (decl) = 0;
6518 else if (DECL_EXTERNAL (old_decl))
6520 DECL_INITIAL (old_decl) = NULL_TREE;
6521 DECL_COMMON (old_decl) = 0;
6522 DECL_ONE_ONLY (old_decl) = 0;
6523 DECL_WEAK (old_decl) = 0;
6528 error ("%Jredefinition of global '%D'", decl, decl);
6529 error ("%J'%D' previously defined here", old_decl, old_decl);
6536 /* Now insert the desired information from all the definitions
6537 into any plain declarations. */
6538 for (tu = tu_list; tu; tu = TREE_CHAIN (tu))
6539 for (decl = BLOCK_VARS (DECL_INITIAL (tu)); decl; decl = TREE_CHAIN (decl))
6540 if (TREE_PUBLIC (decl) && DECL_EXTERNAL (decl))
6543 global_decl = htab_find (link_hash_table, decl);
6548 /* Print any appropriate error messages, and partially merge
6550 (void) duplicate_decls (decl, global_decl);
6553 htab_delete (link_hash_table);
6556 /* Perform final processing on file-scope data. */
6559 c_write_global_declarations(void)
6563 for (link = current_file_decl; link; link = TREE_CHAIN (link))
6565 tree globals = BLOCK_VARS (DECL_INITIAL (link));
6566 int len = list_length (globals);
6567 tree *vec = xmalloc (sizeof (tree) * len);
6571 /* Process the decls in the order they were written. */
6573 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
6576 wrapup_global_declarations (vec, len);
6578 check_global_declarations (vec, len);
6585 /* Reset the parser's state in preparation for a new file. */
6588 c_reset_state (void)
6591 tree file_scope_decl;
6593 /* Pop the global scope. */
6594 if (current_scope != global_scope)
6595 current_scope = global_scope;
6596 file_scope_decl = current_file_decl;
6597 DECL_INITIAL (file_scope_decl) = poplevel (1, 0, 0);
6598 BLOCK_SUPERCONTEXT (DECL_INITIAL (file_scope_decl)) = file_scope_decl;
6599 truly_local_externals = NULL_TREE;
6601 /* Start a new global binding level. */
6603 global_scope = current_scope;
6604 current_file_decl = build_decl (TRANSLATION_UNIT_DECL, NULL, NULL);
6605 TREE_CHAIN (current_file_decl) = file_scope_decl;
6607 /* Reintroduce the builtin declarations. */
6608 for (link = first_builtin_decl;
6609 link != TREE_CHAIN (last_builtin_decl);
6610 link = TREE_CHAIN (link))
6611 pushdecl (copy_node (link));
6614 #include "gt-c-decl.h"