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
233 BOOL_BITFIELD parm_flag : 1;
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_BITFIELD 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_BITFIELD function_body : 1;
246 /* True means make a BLOCK for this scope no matter what. */
247 BOOL_BITFIELD keep : 1;
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
943 || !DECL_BUILT_IN (olddecl) || !C_DECL_INVISIBLE (olddecl))
945 error ("%J'%D' redeclared as different kind of symbol",
947 locate_old_decl (olddecl, error);
949 else if (TREE_PUBLIC (newdecl))
950 warning ("%Jbuilt-in function '%D' declared as non-function",
952 else if (warn_shadow)
953 warning ("%Jshadowing built-in function '%D'",
958 if (!comptypes (oldtype, newtype, COMPARE_STRICT))
960 if (TREE_CODE (olddecl) == FUNCTION_DECL
961 && DECL_BUILT_IN (olddecl) && C_DECL_INVISIBLE (olddecl))
963 /* Accept harmless mismatch in function types.
964 This is for the ffs and fprintf builtins. */
965 tree trytype = match_builtin_function_types (newtype, oldtype);
967 if (trytype && comptypes (newtype, trytype, COMPARE_STRICT))
968 *oldtypep = oldtype = trytype;
971 /* If types don't match for a built-in, throw away the
972 built-in. No point in calling locate_old_decl here, it
973 won't print anything. */
974 warning ("%Jconflicting types for built-in function '%D'",
979 else if (TREE_CODE (olddecl) == FUNCTION_DECL
980 && DECL_SOURCE_LINE (olddecl) == 0)
982 /* A conflicting function declaration for a predeclared
983 function that isn't actually built in. Objective C uses
984 these. The new declaration silently overrides everything
985 but the volatility (i.e. noreturn) indication. See also
986 below. FIXME: Make Objective C use normal builtins. */
987 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
990 /* Permit void foo (...) to match int foo (...) if the latter is
991 the definition and implicit int was used. See
992 c-torture/compile/920625-2.c. */
993 else if (TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl)
994 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype)) == void_type_node
995 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype)) == integer_type_node
996 && C_FUNCTION_IMPLICIT_INT (newdecl))
998 pedwarn ("%Jconflicting types for '%D'", newdecl, newdecl);
999 /* Make sure we keep void as the return type. */
1000 TREE_TYPE (newdecl) = *newtypep = newtype = oldtype;
1001 C_FUNCTION_IMPLICIT_INT (newdecl) = 0;
1006 error ("%Jconflicting types for '%D'", newdecl, newdecl);
1007 diagnose_arglist_conflict (newdecl, olddecl, newtype, oldtype);
1008 locate_old_decl (olddecl, error);
1013 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1014 but silently ignore the redeclaration if either is in a system
1015 header. (Conflicting redeclarations were handled above.) */
1016 if (TREE_CODE (newdecl) == TYPE_DECL)
1018 if (DECL_IN_SYSTEM_HEADER (newdecl) || DECL_IN_SYSTEM_HEADER (olddecl))
1019 return true; /* allow OLDDECL to continue in use */
1021 error ("%Jredefinition of typedef '%D'", newdecl, newdecl);
1022 locate_old_decl (olddecl, error);
1026 /* Function declarations can either be 'static' or 'extern' (no
1027 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1028 can never conflict with each other on account of linkage (6.2.2p4).
1029 Multiple definitions are not allowed (6.9p3,5) but GCC permits
1030 two definitions if one is 'extern inline' and one is not. The non-
1031 extern-inline definition supersedes the extern-inline definition. */
1032 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
1034 /* If you declare a built-in function name as static, or
1035 define the built-in with an old-style definition (so we
1036 can't validate the argument list) the built-in definition is
1037 overridden, but optionally warn this was a bad choice of name. */
1038 if (DECL_BUILT_IN (olddecl)
1039 && C_DECL_INVISIBLE (olddecl)
1040 && (!TREE_PUBLIC (newdecl)
1041 || (DECL_INITIAL (newdecl)
1042 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl)))))
1045 warning ("%Jshadowing built-in function '%D'", newdecl, newdecl);
1046 /* Discard the old built-in function. */
1050 if (DECL_INITIAL (newdecl))
1052 if (DECL_INITIAL (olddecl)
1053 && !(DECL_DECLARED_INLINE_P (olddecl)
1054 && DECL_EXTERNAL (olddecl)
1055 && !(DECL_DECLARED_INLINE_P (newdecl)
1056 && DECL_EXTERNAL (newdecl))))
1058 error ("%Jredefinition of '%D'", newdecl, newdecl);
1059 locate_old_decl (olddecl, error);
1063 /* If we have a prototype after an old-style function definition,
1064 the argument types must be checked specially. */
1065 else if (DECL_INITIAL (olddecl)
1066 && !TYPE_ARG_TYPES (oldtype) && TYPE_ARG_TYPES (newtype)
1067 && TYPE_ACTUAL_ARG_TYPES (oldtype)
1068 && !validate_proto_after_old_defn (newdecl, newtype, oldtype))
1070 locate_old_decl (olddecl, error);
1073 /* Mismatched non-static and static is considered poor style.
1074 We only diagnose static then non-static if -Wtraditional,
1075 because it is the most convenient way to get some effects
1076 (see e.g. what unwind-dw2-fde-glibc.c does to the definition
1077 of _Unwind_Find_FDE in unwind-dw2-fde.c). Revisit? */
1078 if (TREE_PUBLIC (olddecl) && !TREE_PUBLIC (newdecl))
1080 /* A static function declaration for a predeclared function
1081 that isn't actually built in, silently overrides the
1082 default. Objective C uses these. See also above.
1083 FIXME: Make Objective C use normal builtins. */
1084 if (TREE_CODE (olddecl) == FUNCTION_DECL
1085 && DECL_SOURCE_LINE (olddecl) == 0)
1089 warning ("%Jstatic declaration of '%D' follows "
1090 "non-static declaration", newdecl, newdecl);
1094 else if (TREE_PUBLIC (newdecl) && !TREE_PUBLIC (olddecl)
1095 && warn_traditional)
1097 warning ("%Jnon-static declaration of '%D' follows "
1098 "static declaration", newdecl, newdecl);
1102 else if (TREE_CODE (newdecl) == VAR_DECL)
1104 /* Only variables can be thread-local, and all declarations must
1105 agree on this property. */
1106 if (DECL_THREAD_LOCAL (newdecl) != DECL_THREAD_LOCAL (olddecl))
1108 if (DECL_THREAD_LOCAL (newdecl))
1109 error ("%Jthread-local declaration of '%D' follows "
1110 "non-thread-local declaration", newdecl, newdecl);
1112 error ("%Jnon-thread-local declaration of '%D' follows "
1113 "thread-local declaration", newdecl, newdecl);
1115 locate_old_decl (olddecl, error);
1119 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1120 if (DECL_INITIAL (newdecl) && DECL_INITIAL (olddecl))
1122 error ("%Jredefinition of '%D'", newdecl, newdecl);
1123 locate_old_decl (olddecl, error);
1127 /* Objects declared at file scope: if at least one is 'extern',
1128 it's fine (6.2.2p4); otherwise the linkage must agree (6.2.2p7). */
1129 if (DECL_FILE_SCOPE_P (newdecl))
1131 if (!DECL_EXTERNAL (newdecl)
1132 && !DECL_EXTERNAL (olddecl)
1133 && TREE_PUBLIC (newdecl) != TREE_PUBLIC (olddecl))
1135 if (TREE_PUBLIC (newdecl))
1136 error ("%Jnon-static declaration of '%D' follows "
1137 "static declaration", newdecl, newdecl);
1139 error ("%Jstatic declaration of '%D' follows "
1140 "non-static declaration", newdecl, newdecl);
1142 locate_old_decl (olddecl, error);
1146 /* Two objects with the same name declared at the same block
1147 scope must both be external references (6.7p3). */
1148 else if (DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl)
1149 && (!DECL_EXTERNAL (newdecl) || !DECL_EXTERNAL (olddecl)))
1151 if (DECL_EXTERNAL (newdecl))
1152 error ("%Jextern declaration of '%D' follows "
1153 "declaration with no linkage", newdecl, newdecl);
1154 else if (DECL_EXTERNAL (olddecl))
1155 error ("%Jdeclaration of '%D' with no linkage follows "
1156 "extern declaration", newdecl, newdecl);
1158 error ("%Jredeclaration of '%D' with no linkage",
1161 locate_old_decl (olddecl, error);
1167 /* All decls must agree on a non-default visibility. */
1168 if (DECL_VISIBILITY (newdecl) != VISIBILITY_DEFAULT
1169 && DECL_VISIBILITY (olddecl) != VISIBILITY_DEFAULT
1170 && DECL_VISIBILITY (newdecl) != DECL_VISIBILITY (olddecl))
1172 warning ("%Jredeclaration of '%D' with different visibility "
1173 "(old visibility preserved)", newdecl, newdecl);
1177 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1179 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
1180 if (DECL_DECLARED_INLINE_P (newdecl)
1181 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1183 warning ("%Jinline declaration of '%D' follows "
1184 "declaration with attribute noinline", newdecl, newdecl);
1187 else if (DECL_DECLARED_INLINE_P (olddecl)
1188 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1190 warning ("%Jdeclaration of '%D' with attribute noinline follows "
1191 "inline declaration ", newdecl, newdecl);
1195 /* Inline declaration after use or definition.
1196 ??? Should we still warn about this now we have unit-at-a-time
1197 mode and can get it right? */
1198 if (DECL_DECLARED_INLINE_P (newdecl) && !DECL_DECLARED_INLINE_P (olddecl))
1200 if (TREE_USED (olddecl))
1202 warning ("%J'%D' declared inline after being called",
1206 else if (DECL_INITIAL (olddecl))
1208 warning ("%J'%D' declared inline after its definition",
1214 else /* PARM_DECL, VAR_DECL */
1216 /* Redeclaration of a PARM_DECL is invalid unless this is the
1217 real position of a forward-declared parameter (GCC extension). */
1218 if (TREE_CODE (newdecl) == PARM_DECL
1219 && (!TREE_ASM_WRITTEN (olddecl) || TREE_ASM_WRITTEN (newdecl)))
1221 error ("%Jredefinition of parameter '%D'", newdecl, newdecl);
1222 locate_old_decl (olddecl, error);
1226 /* These bits are only type qualifiers when applied to objects. */
1227 if (TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl))
1229 if (TREE_THIS_VOLATILE (newdecl))
1230 pedwarn ("%Jvolatile declaration of '%D' follows "
1231 "non-volatile declaration", newdecl, newdecl);
1233 pedwarn ("%Jnon-volatile declaration of '%D' follows "
1234 "volatile declaration", newdecl, newdecl);
1237 if (TREE_READONLY (newdecl) != TREE_READONLY (olddecl))
1239 if (TREE_READONLY (newdecl))
1240 pedwarn ("%Jconst declaration of '%D' follows "
1241 "non-const declaration", newdecl, newdecl);
1243 pedwarn ("%Jnon-const declaration of '%D' follows "
1244 "const declaration", newdecl, newdecl);
1249 /* Optional warning for completely redundant decls. */
1250 if (!warned && !pedwarned
1251 && warn_redundant_decls
1252 /* Don't warn about a function declaration followed by a
1254 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1255 && DECL_INITIAL (newdecl) && !DECL_INITIAL (olddecl))
1256 /* Don't warn about redundant redeclarations of builtins. */
1257 && !(TREE_CODE (newdecl) == FUNCTION_DECL
1258 && !DECL_BUILT_IN (newdecl)
1259 && DECL_BUILT_IN (olddecl)
1260 && C_DECL_INVISIBLE (olddecl))
1261 /* Don't warn about an extern followed by a definition. */
1262 && !(DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl))
1263 /* Don't warn about forward parameter decls. */
1264 && !(TREE_CODE (newdecl) == PARM_DECL
1265 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl)))
1267 warning ("%Jredundant redeclaration of '%D'", newdecl, newdecl);
1271 /* Report location of previous decl/defn in a consistent manner. */
1272 if (warned || pedwarned)
1273 locate_old_decl (olddecl, pedwarned ? pedwarn : warning);
1278 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1279 consistent with OLDDECL, but carries new information. Merge the
1280 new information into OLDDECL. This function issues no
1284 merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
1286 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1287 && DECL_INITIAL (newdecl) != 0);
1289 /* For real parm decl following a forward decl, return 1 so old decl
1290 will be reused. Only allow this to happen once. */
1291 if (TREE_CODE (newdecl) == PARM_DECL
1292 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1294 TREE_ASM_WRITTEN (olddecl) = 0;
1298 DECL_ATTRIBUTES (newdecl)
1299 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1301 /* Merge the data types specified in the two decls. */
1303 = TREE_TYPE (olddecl)
1304 = common_type (newtype, oldtype);
1306 /* Lay the type out, unless already done. */
1307 if (oldtype != TREE_TYPE (newdecl))
1309 if (TREE_TYPE (newdecl) != error_mark_node)
1310 layout_type (TREE_TYPE (newdecl));
1311 if (TREE_CODE (newdecl) != FUNCTION_DECL
1312 && TREE_CODE (newdecl) != TYPE_DECL
1313 && TREE_CODE (newdecl) != CONST_DECL)
1314 layout_decl (newdecl, 0);
1318 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1319 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1320 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1321 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1322 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1323 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1325 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1326 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1330 /* Keep the old rtl since we can safely use it. */
1331 COPY_DECL_RTL (olddecl, newdecl);
1333 /* Merge the type qualifiers. */
1334 if (TREE_READONLY (newdecl))
1335 TREE_READONLY (olddecl) = 1;
1337 if (TREE_THIS_VOLATILE (newdecl))
1339 TREE_THIS_VOLATILE (olddecl) = 1;
1340 if (TREE_CODE (newdecl) == VAR_DECL)
1341 make_var_volatile (newdecl);
1344 /* Keep source location of definition rather than declaration. */
1345 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1346 DECL_SOURCE_LOCATION (newdecl) = DECL_SOURCE_LOCATION (olddecl);
1348 /* Merge the unused-warning information. */
1349 if (DECL_IN_SYSTEM_HEADER (olddecl))
1350 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1351 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1352 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1354 /* Merge the initialization information. */
1355 if (DECL_INITIAL (newdecl) == 0)
1356 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1358 /* Merge the section attribute.
1359 We want to issue an error if the sections conflict but that must be
1360 done later in decl_attributes since we are called before attributes
1362 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1363 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1365 /* Copy the assembler name.
1366 Currently, it can only be defined in the prototype. */
1367 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1369 /* If either declaration has a nondefault visibility, use it. */
1370 if (DECL_VISIBILITY (olddecl) != VISIBILITY_DEFAULT)
1371 DECL_VISIBILITY (newdecl) = DECL_VISIBILITY (olddecl);
1373 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1375 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1376 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1377 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1378 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1379 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1380 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1381 TREE_READONLY (newdecl) |= TREE_READONLY (olddecl);
1382 DECL_IS_MALLOC (newdecl) |= DECL_IS_MALLOC (olddecl);
1383 DECL_IS_PURE (newdecl) |= DECL_IS_PURE (olddecl);
1386 /* Merge the storage class information. */
1387 merge_weak (newdecl, olddecl);
1389 /* For functions, static overrides non-static. */
1390 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1392 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1393 /* This is since we don't automatically
1394 copy the attributes of NEWDECL into OLDDECL. */
1395 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1396 /* If this clears `static', clear it in the identifier too. */
1397 if (! TREE_PUBLIC (olddecl))
1398 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1400 if (DECL_EXTERNAL (newdecl))
1402 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1403 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1405 /* An extern decl does not override previous storage class. */
1406 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1407 if (! DECL_EXTERNAL (newdecl))
1409 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1410 DECL_COMMON (newdecl) = DECL_COMMON (olddecl);
1415 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1416 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1419 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1421 /* If we're redefining a function previously defined as extern
1422 inline, make sure we emit debug info for the inline before we
1423 throw it away, in case it was inlined into a function that hasn't
1424 been written out yet. */
1425 if (new_is_definition && DECL_INITIAL (olddecl))
1427 if (TREE_USED (olddecl)
1428 /* In unit-at-a-time mode we never inline re-defined extern
1429 inline functions. */
1430 && !flag_unit_at_a_time
1431 && cgraph_function_possibly_inlined_p (olddecl))
1432 (*debug_hooks->outlining_inline_function) (olddecl);
1434 /* The new defn must not be inline. */
1435 DECL_INLINE (newdecl) = 0;
1436 DECL_UNINLINABLE (newdecl) = 1;
1440 /* If either decl says `inline', this fn is inline,
1441 unless its definition was passed already. */
1442 if (DECL_DECLARED_INLINE_P (newdecl)
1443 || DECL_DECLARED_INLINE_P (olddecl))
1444 DECL_DECLARED_INLINE_P (newdecl) = 1;
1446 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1447 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1450 if (DECL_BUILT_IN (olddecl))
1452 /* If redeclaring a builtin function, it stays built in. */
1453 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1454 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1457 /* Also preserve various other info from the definition. */
1458 if (! new_is_definition)
1460 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1461 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1462 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1463 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1464 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1466 /* Set DECL_INLINE on the declaration if we've got a body
1467 from which to instantiate. */
1468 if (DECL_INLINE (olddecl) && ! DECL_UNINLINABLE (newdecl))
1470 DECL_INLINE (newdecl) = 1;
1471 DECL_ABSTRACT_ORIGIN (newdecl)
1472 = DECL_ABSTRACT_ORIGIN (olddecl);
1477 /* If a previous declaration said inline, mark the
1478 definition as inlinable. */
1479 if (DECL_DECLARED_INLINE_P (newdecl)
1480 && ! DECL_UNINLINABLE (newdecl))
1481 DECL_INLINE (newdecl) = 1;
1485 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1486 But preserve OLDDECL's DECL_UID and C_DECL_INVISIBLE. */
1488 unsigned olddecl_uid = DECL_UID (olddecl);
1489 unsigned olddecl_invisible = C_DECL_INVISIBLE (olddecl);
1491 memcpy ((char *) olddecl + sizeof (struct tree_common),
1492 (char *) newdecl + sizeof (struct tree_common),
1493 sizeof (struct tree_decl) - sizeof (struct tree_common));
1494 DECL_UID (olddecl) = olddecl_uid;
1495 C_DECL_INVISIBLE (olddecl) = olddecl_invisible;
1498 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1499 so that encode_section_info has a chance to look at the new decl
1500 flags and attributes. */
1501 if (DECL_RTL_SET_P (olddecl)
1502 && (TREE_CODE (olddecl) == FUNCTION_DECL
1503 || (TREE_CODE (olddecl) == VAR_DECL
1504 && TREE_STATIC (olddecl))))
1505 make_decl_rtl (olddecl, NULL);
1508 /* Handle when a new declaration NEWDECL has the same name as an old
1509 one OLDDECL in the same binding contour. Prints an error message
1512 If safely possible, alter OLDDECL to look like NEWDECL, and return
1513 true. Otherwise, return false. */
1516 duplicate_decls (tree newdecl, tree olddecl)
1518 tree newtype, oldtype;
1520 if (!diagnose_mismatched_decls (newdecl, olddecl, &newtype, &oldtype))
1523 merge_decls (newdecl, olddecl, newtype, oldtype);
1528 /* Return any external DECL associated with ID, whether or not it is
1529 currently in scope. */
1532 any_external_decl (tree id)
1534 tree decl = IDENTIFIER_SYMBOL_VALUE (id);
1537 if (decl == 0 || TREE_CODE (decl) == ERROR_MARK)
1539 else if (TREE_CODE (decl) != TYPE_DECL && DECL_EXTERNAL (decl))
1542 t = purpose_member (id, truly_local_externals);
1544 return TREE_VALUE (t);
1549 /* Record an external decl DECL. This only does something if a
1550 shadowing decl already exists. */
1552 record_external_decl (tree decl)
1554 tree name = DECL_NAME (decl);
1555 if (!IDENTIFIER_SYMBOL_VALUE (name))
1558 truly_local_externals = tree_cons (name, decl, truly_local_externals);
1561 /* Check whether decl-node X shadows an existing declaration.
1562 OLD is the old IDENTIFIER_SYMBOL_VALUE of the DECL_NAME of X,
1563 which might be a NULL_TREE. */
1565 warn_if_shadowing (tree x, tree old)
1567 /* Nothing to shadow? */
1569 /* Shadow warnings not wanted? */
1571 /* No shadow warnings for internally generated vars. */
1572 || DECL_SOURCE_LINE (x) == 0
1573 /* No shadow warnings for vars made for inlining. */
1574 || DECL_FROM_INLINE (x)
1575 /* Don't warn about the parm names in function declarator
1576 within a function declarator.
1577 It would be nice to avoid warning in any function
1578 declarator in a declaration, as opposed to a definition,
1579 but there is no way to tell it's not a definition. */
1580 || (TREE_CODE (x) == PARM_DECL && current_scope->outer->parm_flag)
1581 /* Shadow warnings only apply to local variables and parameters. */
1582 || (TREE_CODE (x) != PARM_DECL && DECL_FILE_SCOPE_P (x)))
1585 if (TREE_CODE (old) == PARM_DECL)
1586 warning ("%Jdeclaration of '%D' shadows a parameter", x, x);
1587 else if (DECL_FILE_SCOPE_P (old))
1588 warning ("%Jdeclaration of '%D' shadows a global declaration", x, x);
1590 warning ("%Jdeclaration of '%D' shadows a previous local", x, x);
1592 warning ("%Jshadowed declaration is here", old);
1596 /* Subroutine of pushdecl.
1598 X is a TYPE_DECL for a typedef statement. Create a brand new
1599 ..._TYPE node (which will be just a variant of the existing
1600 ..._TYPE node with identical properties) and then install X
1601 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1603 The whole point here is to end up with a situation where each
1604 and every ..._TYPE node the compiler creates will be uniquely
1605 associated with AT MOST one node representing a typedef name.
1606 This way, even though the compiler substitutes corresponding
1607 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1608 early on, later parts of the compiler can always do the reverse
1609 translation and get back the corresponding typedef name. For
1612 typedef struct S MY_TYPE;
1615 Later parts of the compiler might only know that `object' was of
1616 type `struct S' if it were not for code just below. With this
1617 code however, later parts of the compiler see something like:
1619 struct S' == struct S
1620 typedef struct S' MY_TYPE;
1623 And they can then deduce (from the node for type struct S') that
1624 the original object declaration was:
1628 Being able to do this is important for proper support of protoize,
1629 and also for generating precise symbolic debugging information
1630 which takes full account of the programmer's (typedef) vocabulary.
1632 Obviously, we don't want to generate a duplicate ..._TYPE node if
1633 the TYPE_DECL node that we are now processing really represents a
1634 standard built-in type.
1636 Since all standard types are effectively declared at line zero
1637 in the source file, we can easily check to see if we are working
1638 on a standard type by checking the current value of lineno. */
1641 clone_underlying_type (tree x)
1643 if (DECL_SOURCE_LINE (x) == 0)
1645 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1646 TYPE_NAME (TREE_TYPE (x)) = x;
1648 else if (TREE_TYPE (x) != error_mark_node
1649 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
1651 tree tt = TREE_TYPE (x);
1652 DECL_ORIGINAL_TYPE (x) = tt;
1653 tt = build_type_copy (tt);
1655 TREE_USED (tt) = TREE_USED (x);
1660 /* Record a decl-node X as belonging to the current lexical scope.
1661 Check for errors (such as an incompatible declaration for the same
1662 name already seen in the same scope).
1664 Returns either X or an old decl for the same name.
1665 If an old decl is returned, it may have been smashed
1666 to agree with what X says. */
1671 tree name = DECL_NAME (x);
1672 struct c_scope *scope = current_scope;
1674 #ifdef ENABLE_CHECKING
1675 if (error_mark_node == 0)
1676 /* Called too early. */
1680 /* Functions need the lang_decl data. */
1681 if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
1682 DECL_LANG_SPECIFIC (x) = ggc_alloc_cleared (sizeof (struct lang_decl));
1684 /* A local extern declaration for a function doesn't constitute nesting.
1685 A local auto declaration does, since it's a forward decl
1686 for a nested function coming later. */
1687 if (current_function_decl == NULL
1688 || ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
1689 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x)))
1690 DECL_CONTEXT (x) = current_file_decl;
1692 DECL_CONTEXT (x) = current_function_decl;
1698 if (warn_nested_externs
1699 && scope != global_scope
1700 && DECL_EXTERNAL (x)
1701 && !DECL_IN_SYSTEM_HEADER (x))
1702 warning ("nested extern declaration of `%s'",
1703 IDENTIFIER_POINTER (name));
1705 old = lookup_name_current_level (name);
1706 if (old && duplicate_decls (x, old))
1708 /* For PARM_DECLs, old may be a forward declaration.
1709 If so, we want to remove it from its old location
1710 (in the variables chain) and rechain it in the
1711 location given by the new declaration. */
1712 if (TREE_CODE (x) == PARM_DECL)
1715 for (p = &scope->names; *p; p = &TREE_CHAIN (*p))
1718 *p = TREE_CHAIN (old);
1719 SCOPE_LIST_APPEND (scope, parms, old);
1725 if (DECL_EXTERNAL (x) || scope == global_scope)
1727 /* Find and check against a previous, not-in-scope, external
1728 decl for this identifier. (C99 6.2.7p2: All declarations
1729 that refer to the same object or function shall have
1730 compatible type; otherwise, the behavior is undefined.) */
1731 tree ext = any_external_decl (name);
1734 if (duplicate_decls (x, ext))
1735 x = copy_node (ext);
1738 record_external_decl (x);
1741 if (TREE_CODE (x) == TYPE_DECL)
1742 clone_underlying_type (x);
1744 /* If storing a local value, there may already be one
1745 (inherited). If so, record it for restoration when this
1746 scope ends. Take care not to do this if we are replacing an
1747 older decl in the same scope (i.e. duplicate_decls returned
1749 if (scope != global_scope)
1751 tree inherited_decl = lookup_name (name);
1752 if (inherited_decl && inherited_decl != old)
1754 warn_if_shadowing (x, inherited_decl);
1755 scope->shadowed = tree_cons (name, inherited_decl,
1760 /* Install the new declaration in the requested scope. */
1761 IDENTIFIER_SYMBOL_VALUE (name) = x;
1762 C_DECL_INVISIBLE (x) = 0;
1764 /* If x's type is incomplete because it's based on a
1765 structure or union which has not yet been fully declared,
1766 attach it to that structure or union type, so we can go
1767 back and complete the variable declaration later, if the
1768 structure or union gets fully declared.
1770 If the input is erroneous, we can have error_mark in the type
1771 slot (e.g. "f(void a, ...)") - that doesn't count as an
1773 if (TREE_TYPE (x) != error_mark_node
1774 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
1776 tree element = TREE_TYPE (x);
1778 while (TREE_CODE (element) == ARRAY_TYPE)
1779 element = TREE_TYPE (element);
1780 element = TYPE_MAIN_VARIANT (element);
1782 if ((TREE_CODE (element) == RECORD_TYPE
1783 || TREE_CODE (element) == UNION_TYPE)
1784 && (TREE_CODE (x) != TYPE_DECL
1785 || TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE)
1786 && !COMPLETE_TYPE_P (element))
1787 C_TYPE_INCOMPLETE_VARS (element)
1788 = tree_cons (NULL_TREE, x, C_TYPE_INCOMPLETE_VARS (element));
1792 if (TREE_CODE (x) == PARM_DECL)
1793 SCOPE_LIST_APPEND (scope, parms, x);
1795 SCOPE_LIST_APPEND (scope, names, x);
1800 /* Record X as belonging to the global scope (C99 "file scope").
1801 This is used only internally by the Objective-C front end,
1802 and is limited to its needs. duplicate_decls is not called;
1803 if there is any preexisting decl for this identifier, it is an ICE. */
1806 pushdecl_top_level (tree x)
1810 if (TREE_CODE (x) != VAR_DECL)
1813 name = DECL_NAME (x);
1815 if (IDENTIFIER_SYMBOL_VALUE (name))
1818 DECL_CONTEXT (x) = current_file_decl;
1819 IDENTIFIER_SYMBOL_VALUE (name) = x;
1821 SCOPE_LIST_APPEND (global_scope, names, x);
1825 /* Generate an implicit declaration for identifier FUNCTIONID as a
1826 function of type int (). */
1829 implicitly_declare (tree functionid)
1831 tree decl = any_external_decl (functionid);
1835 /* Implicit declaration of a function already declared
1836 (somehow) in a different scope, or as a built-in.
1837 If this is the first time this has happened, warn;
1838 then recycle the old declaration. */
1839 if (!C_DECL_IMPLICIT (decl))
1841 implicit_decl_warning (DECL_NAME (decl));
1842 if (! DECL_FILE_SCOPE_P (decl))
1843 warning ("%Jprevious declaration of '%D'", decl, decl);
1844 C_DECL_IMPLICIT (decl) = 1;
1846 /* If this function is global, then it must already be in the
1847 global scope, so there's no need to push it again. */
1848 if (current_scope == global_scope)
1850 /* If this is a local declaration, make a copy; we can't have
1851 the same DECL listed in two different scopes. */
1852 return pushdecl (copy_node (decl));
1855 /* Not seen before. */
1856 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
1857 DECL_EXTERNAL (decl) = 1;
1858 TREE_PUBLIC (decl) = 1;
1859 C_DECL_IMPLICIT (decl) = 1;
1860 implicit_decl_warning (functionid);
1862 /* C89 says implicit declarations are in the innermost block.
1863 So we record the decl in the standard fashion. */
1864 decl = pushdecl (decl);
1866 /* No need to call objc_check_decl here - it's a function type. */
1867 rest_of_decl_compilation (decl, NULL, 0, 0);
1869 /* Write a record describing this implicit function declaration
1870 to the prototypes file (if requested). */
1871 gen_aux_info_record (decl, 0, 1, 0);
1873 /* Possibly apply some default attributes to this implicit declaration. */
1874 decl_attributes (&decl, NULL_TREE, 0);
1880 implicit_decl_warning (tree id)
1882 const char *name = IDENTIFIER_POINTER (id);
1883 if (mesg_implicit_function_declaration == 2)
1884 error ("implicit declaration of function `%s'", name);
1885 else if (mesg_implicit_function_declaration == 1)
1886 warning ("implicit declaration of function `%s'", name);
1889 /* Issue an error message for a reference to an undeclared variable
1890 ID, including a reference to a builtin outside of function-call
1891 context. Establish a binding of the identifier to error_mark_node
1892 in an appropriate scope, which will suppress further errors for the
1895 undeclared_variable (tree id)
1897 static bool already = false;
1898 struct c_scope *scope;
1900 if (current_function_decl == 0)
1902 error ("`%s' undeclared here (not in a function)",
1903 IDENTIFIER_POINTER (id));
1904 scope = current_scope;
1908 error ("`%s' undeclared (first use in this function)",
1909 IDENTIFIER_POINTER (id));
1913 error ("(Each undeclared identifier is reported only once");
1914 error ("for each function it appears in.)");
1918 scope = current_function_scope;
1921 scope->shadowed = tree_cons (id, IDENTIFIER_SYMBOL_VALUE (id),
1923 IDENTIFIER_SYMBOL_VALUE (id) = error_mark_node;
1926 /* Subroutine of lookup_label, declare_label, define_label: construct a
1927 LABEL_DECL with all the proper frills. */
1930 make_label (tree name, location_t location)
1932 tree label = build_decl (LABEL_DECL, name, void_type_node);
1934 DECL_CONTEXT (label) = current_function_decl;
1935 DECL_MODE (label) = VOIDmode;
1936 DECL_SOURCE_LOCATION (label) = location;
1941 /* Another subroutine of lookup_label, declare_label, define_label:
1942 set up the binding of name to LABEL_DECL in the given SCOPE. */
1945 bind_label (tree name, tree label, struct c_scope *scope)
1947 if (IDENTIFIER_LABEL_VALUE (name))
1948 scope->shadowed = tree_cons (name, IDENTIFIER_LABEL_VALUE (name),
1950 IDENTIFIER_LABEL_VALUE (name) = label;
1952 SCOPE_LIST_APPEND (scope, names, label);
1955 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
1956 Create one if none exists so far for the current function.
1957 This is called when a label is used in a goto expression or
1958 has its address taken. */
1961 lookup_label (tree name)
1965 if (current_function_decl == 0)
1967 error ("label %s referenced outside of any function",
1968 IDENTIFIER_POINTER (name));
1972 /* Use a label already defined or ref'd with this name, but not if
1973 it is inherited from a containing function and wasn't declared
1975 label = IDENTIFIER_LABEL_VALUE (name);
1976 if (label && (DECL_CONTEXT (label) == current_function_decl
1977 || C_DECLARED_LABEL_FLAG (label)))
1979 /* If the label has only been declared, update its apparent
1980 location to point here, for better diagnostics if it
1981 turns out not to have been defined. */
1982 if (!TREE_USED (label))
1983 DECL_SOURCE_LOCATION (label) = input_location;
1987 /* No label binding for that identifier; make one. */
1988 label = make_label (name, input_location);
1990 /* Ordinary labels go in the current function scope. */
1991 bind_label (name, label, current_function_scope);
1995 /* Make a label named NAME in the current function, shadowing silently
1996 any that may be inherited from containing functions or containing
1997 scopes. This is called for __label__ declarations. */
1999 /* Note that valid use, if the label being shadowed comes from another
2000 scope in the same function, requires calling declare_nonlocal_label
2001 right away. (Is this still true? -zw 2003-07-17) */
2004 declare_label (tree name)
2006 tree label = IDENTIFIER_LABEL_VALUE (name);
2009 /* Check to make sure that the label hasn't already been declared
2011 for (dup = current_scope->names; dup; dup = TREE_CHAIN (dup))
2014 error ("duplicate label declaration `%s'", IDENTIFIER_POINTER (name));
2015 error ("%Jthis is a previous declaration", dup);
2017 /* Just use the previous declaration. */
2021 label = make_label (name, input_location);
2022 C_DECLARED_LABEL_FLAG (label) = 1;
2024 /* Declared labels go in the current scope. */
2025 bind_label (name, label, current_scope);
2029 /* Define a label, specifying the location in the source file.
2030 Return the LABEL_DECL node for the label, if the definition is valid.
2031 Otherwise return 0. */
2034 define_label (location_t location, tree name)
2038 /* Find any preexisting label with this name. It is an error
2039 if that label has already been defined in this function, or
2040 if there is a containing function with a declared label with
2042 label = IDENTIFIER_LABEL_VALUE (name);
2045 && ((DECL_CONTEXT (label) == current_function_decl
2046 && DECL_INITIAL (label) != 0)
2047 || (DECL_CONTEXT (label) != current_function_decl
2048 && C_DECLARED_LABEL_FLAG (label))))
2050 error ("%Hduplicate label `%D'", &location, label);
2051 if (DECL_INITIAL (label))
2052 error ("%J`%D' previously defined here", label, label);
2054 error ("%J`%D' previously declared here", label, label);
2057 else if (label && DECL_CONTEXT (label) == current_function_decl)
2059 /* The label has been used or declared already in this function,
2060 but not defined. Update its location to point to this
2062 DECL_SOURCE_LOCATION (label) = location;
2066 /* No label binding for that identifier; make one. */
2067 label = make_label (name, location);
2069 /* Ordinary labels go in the current function scope. */
2070 bind_label (name, label, current_function_scope);
2073 if (warn_traditional && !in_system_header && lookup_name (name))
2074 warning ("%Htraditional C lacks a separate namespace for labels, "
2075 "identifier `%s' conflicts", &location,
2076 IDENTIFIER_POINTER (name));
2078 /* Mark label as having been defined. */
2079 DECL_INITIAL (label) = error_mark_node;
2083 /* Return the list of declarations of the current scope. */
2088 return current_scope->names;
2092 /* Given NAME, an IDENTIFIER_NODE,
2093 return the structure (or union or enum) definition for that name.
2094 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2095 CODE says which kind of type the caller wants;
2096 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2097 If the wrong kind of type is found, an error is reported. */
2100 lookup_tag (enum tree_code code, tree name, int thislevel_only)
2102 tree tag = IDENTIFIER_TAG_VALUE (name);
2108 /* We only care about whether it's in this level if
2109 thislevel_only was set or it might be a type clash. */
2110 if (thislevel_only || TREE_CODE (tag) != code)
2112 if (current_scope == global_scope
2113 || purpose_member (name, current_scope->tags))
2117 if (thislevel_only && !thislevel)
2120 if (TREE_CODE (tag) != code)
2122 /* Definition isn't the kind we were looking for. */
2123 pending_invalid_xref = name;
2124 pending_invalid_xref_location = input_location;
2126 /* If in the same binding level as a declaration as a tag
2127 of a different type, this must not be allowed to
2128 shadow that tag, so give the error immediately.
2129 (For example, "struct foo; union foo;" is invalid.) */
2131 pending_xref_error ();
2136 /* Print an error message now
2137 for a recent invalid struct, union or enum cross reference.
2138 We don't print them immediately because they are not invalid
2139 when used in the `struct foo;' construct for shadowing. */
2142 pending_xref_error (void)
2144 if (pending_invalid_xref != 0)
2145 error ("%H`%s' defined as wrong kind of tag",
2146 &pending_invalid_xref_location,
2147 IDENTIFIER_POINTER (pending_invalid_xref));
2148 pending_invalid_xref = 0;
2152 /* Look up NAME in the current scope and its superiors
2153 in the namespace of variables, functions and typedefs.
2154 Return a ..._DECL node of some kind representing its definition,
2155 or return 0 if it is undefined. */
2158 lookup_name (tree name)
2160 tree decl = IDENTIFIER_SYMBOL_VALUE (name);
2161 if (decl == 0 || decl == error_mark_node)
2163 if (C_DECL_INVISIBLE (decl))
2168 /* Similar to `lookup_name' but look only at the current scope. */
2171 lookup_name_current_level (tree name)
2173 tree decl = IDENTIFIER_SYMBOL_VALUE (name);
2175 if (decl == 0 || decl == error_mark_node || C_DECL_INVISIBLE (decl))
2178 if (current_scope == global_scope)
2181 /* Scan the current scope for a decl with name NAME.
2182 For PARM_DECLs, we have to look at both ->parms and ->names, since
2183 forward parameter declarations wind up on the ->names list. */
2184 if (TREE_CODE (decl) == PARM_DECL
2185 && chain_member (decl, current_scope->parms))
2187 if (chain_member (decl, current_scope->names))
2193 /* Create the predefined scalar types of C,
2194 and some nodes representing standard constants (0, 1, (void *) 0).
2195 Initialize the global scope.
2196 Make definitions for built-in primitive functions. */
2199 c_init_decl_processing (void)
2202 tree ptr_ftype_void, ptr_ftype_ptr;
2203 location_t save_loc = input_location;
2205 /* Adds some ggc roots, and reserved words for c-parse.in. */
2208 current_function_decl = 0;
2210 /* Make the c_scope structure for global names. */
2212 global_scope = current_scope;
2214 /* Declarations from c_common_nodes_and_builtins must not be associated
2215 with this input file, lest we get differences between using and not
2216 using preprocessed headers. */
2217 input_location.file = "<internal>";
2218 input_location.line = 0;
2220 /* Make the DECL for the toplevel file scope. */
2221 current_file_decl = build_decl (TRANSLATION_UNIT_DECL, NULL, NULL);
2223 build_common_tree_nodes (flag_signed_char);
2225 c_common_nodes_and_builtins ();
2227 /* In C, comparisons and TRUTH_* expressions have type int. */
2228 truthvalue_type_node = integer_type_node;
2229 truthvalue_true_node = integer_one_node;
2230 truthvalue_false_node = integer_zero_node;
2232 /* Even in C99, which has a real boolean type. */
2233 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2234 boolean_type_node));
2236 endlink = void_list_node;
2237 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
2239 = build_function_type (ptr_type_node,
2240 tree_cons (NULL_TREE, ptr_type_node, endlink));
2242 input_location = save_loc;
2244 pedantic_lvalues = pedantic;
2246 make_fname_decl = c_make_fname_decl;
2247 start_fname_decls ();
2249 first_builtin_decl = global_scope->names;
2250 last_builtin_decl = global_scope->names_last;
2253 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2254 decl, NAME is the initialization string and TYPE_DEP indicates whether
2255 NAME depended on the type of the function. As we don't yet implement
2256 delayed emission of static data, we mark the decl as emitted
2257 so it is not placed in the output. Anything using it must therefore pull
2258 out the STRING_CST initializer directly. FIXME. */
2261 c_make_fname_decl (tree id, int type_dep)
2263 const char *name = fname_as_string (type_dep);
2264 tree decl, type, init;
2265 size_t length = strlen (name);
2267 type = build_array_type
2268 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
2269 build_index_type (size_int (length)));
2271 decl = build_decl (VAR_DECL, id, type);
2273 TREE_STATIC (decl) = 1;
2274 TREE_READONLY (decl) = 1;
2275 DECL_ARTIFICIAL (decl) = 1;
2277 init = build_string (length + 1, name);
2278 TREE_TYPE (init) = type;
2279 DECL_INITIAL (decl) = init;
2281 TREE_USED (decl) = 1;
2283 if (current_function_decl)
2285 DECL_CONTEXT (decl) = current_function_decl;
2286 IDENTIFIER_SYMBOL_VALUE (id) = decl;
2287 SCOPE_LIST_APPEND (current_function_scope, names, decl);
2290 finish_decl (decl, init, NULL_TREE);
2295 /* Return a definition for a builtin function named NAME and whose data type
2296 is TYPE. TYPE should be a function type with argument types.
2297 FUNCTION_CODE tells later passes how to compile calls to this function.
2298 See tree.h for its possible values.
2300 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2301 the name to be called if we can't opencode the function. If
2302 ATTRS is nonzero, use that for the function's attribute list. */
2305 builtin_function (const char *name, tree type, int function_code,
2306 enum built_in_class class, const char *library_name,
2309 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
2310 DECL_EXTERNAL (decl) = 1;
2311 TREE_PUBLIC (decl) = 1;
2313 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2314 make_decl_rtl (decl, NULL);
2316 DECL_BUILT_IN_CLASS (decl) = class;
2317 DECL_FUNCTION_CODE (decl) = function_code;
2319 /* Warn if a function in the namespace for users
2320 is used without an occasion to consider it declared. */
2321 if (name[0] != '_' || name[1] != '_')
2322 C_DECL_INVISIBLE (decl) = 1;
2324 /* Possibly apply some default attributes to this built-in function. */
2326 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2328 decl_attributes (&decl, NULL_TREE, 0);
2333 /* Called when a declaration is seen that contains no names to declare.
2334 If its type is a reference to a structure, union or enum inherited
2335 from a containing scope, shadow that tag name for the current scope
2336 with a forward reference.
2337 If its type defines a new named structure or union
2338 or defines an enum, it is valid but we need not do anything here.
2339 Otherwise, it is an error. */
2342 shadow_tag (tree declspecs)
2344 shadow_tag_warned (declspecs, 0);
2348 shadow_tag_warned (tree declspecs, int warned)
2351 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
2358 pending_invalid_xref = 0;
2360 /* Remove the attributes from declspecs, since they will confuse the
2362 split_specs_attrs (declspecs, &specs, &attrs);
2364 for (link = specs; link; link = TREE_CHAIN (link))
2366 tree value = TREE_VALUE (link);
2367 enum tree_code code = TREE_CODE (value);
2369 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2370 /* Used to test also that TYPE_SIZE (value) != 0.
2371 That caused warning for `struct foo;' at top level in the file. */
2373 tree name = TYPE_NAME (value);
2380 if (warned != 1 && code != ENUMERAL_TYPE)
2381 /* Empty unnamed enum OK */
2383 pedwarn ("unnamed struct/union that defines no instances");
2389 t = lookup_tag (code, name, 1);
2393 t = make_node (code);
2400 if (!warned && ! in_system_header)
2402 warning ("useless keyword or type name in empty declaration");
2409 error ("two types specified in one empty declaration");
2414 pedwarn ("empty declaration");
2418 /* Construct an array declarator. EXPR is the expression inside [], or
2419 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2420 to the pointer to which a parameter array is converted). STATIC_P is
2421 nonzero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
2422 is nonzero is the array is [*], a VLA of unspecified length which is
2423 nevertheless a complete type (not currently implemented by GCC),
2424 zero otherwise. The declarator is constructed as an ARRAY_REF
2425 (to be decoded by grokdeclarator), whose operand 0 is what's on the
2426 left of the [] (filled by in set_array_declarator_type) and operand 1
2427 is the expression inside; whose TREE_TYPE is the type qualifiers and
2428 which has TREE_STATIC set if "static" is used. */
2431 build_array_declarator (tree expr, tree quals, int static_p, int vla_unspec_p)
2434 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
2435 TREE_TYPE (decl) = quals;
2436 TREE_STATIC (decl) = (static_p ? 1 : 0);
2437 if (pedantic && !flag_isoc99)
2439 if (static_p || quals != NULL_TREE)
2440 pedwarn ("ISO C90 does not support `static' or type qualifiers in parameter array declarators");
2442 pedwarn ("ISO C90 does not support `[*]' array declarators");
2445 warning ("GCC does not yet properly implement `[*]' array declarators");
2449 /* Set the type of an array declarator. DECL is the declarator, as
2450 constructed by build_array_declarator; TYPE is what appears on the left
2451 of the [] and goes in operand 0. ABSTRACT_P is nonzero if it is an
2452 abstract declarator, zero otherwise; this is used to reject static and
2453 type qualifiers in abstract declarators, where they are not in the
2457 set_array_declarator_type (tree decl, tree type, int abstract_p)
2459 TREE_OPERAND (decl, 0) = type;
2460 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
2461 error ("static or type qualifiers in abstract declarator");
2465 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2468 groktypename (tree typename)
2472 if (TREE_CODE (typename) != TREE_LIST)
2475 split_specs_attrs (TREE_PURPOSE (typename), &specs, &attrs);
2477 typename = grokdeclarator (TREE_VALUE (typename), specs, TYPENAME, 0,
2480 /* Apply attributes. */
2481 decl_attributes (&typename, attrs, 0);
2486 /* Return a PARM_DECL node for a given pair of specs and declarator. */
2489 groktypename_in_parm_context (tree typename)
2491 if (TREE_CODE (typename) != TREE_LIST)
2493 return grokdeclarator (TREE_VALUE (typename),
2494 TREE_PURPOSE (typename),
2498 /* Decode a declarator in an ordinary declaration or data definition.
2499 This is called as soon as the type information and variable name
2500 have been parsed, before parsing the initializer if any.
2501 Here we create the ..._DECL node, fill in its type,
2502 and put it on the list of decls for the current context.
2503 The ..._DECL node is returned as the value.
2505 Exception: for arrays where the length is not specified,
2506 the type is left null, to be filled in by `finish_decl'.
2508 Function definitions do not come here; they go to start_function
2509 instead. However, external and forward declarations of functions
2510 do go through here. Structure field declarations are done by
2511 grokfield and not through here. */
2514 start_decl (tree declarator, tree declspecs, int initialized, tree attributes)
2519 /* An object declared as __attribute__((deprecated)) suppresses
2520 warnings of uses of other deprecated items. */
2521 if (lookup_attribute ("deprecated", attributes))
2522 deprecated_state = DEPRECATED_SUPPRESS;
2524 decl = grokdeclarator (declarator, declspecs,
2525 NORMAL, initialized, NULL);
2527 deprecated_state = DEPRECATED_NORMAL;
2529 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
2530 && MAIN_NAME_P (DECL_NAME (decl)))
2531 warning ("%J'%D' is usually a function", decl, decl);
2534 /* Is it valid for this decl to have an initializer at all?
2535 If not, set INITIALIZED to zero, which will indirectly
2536 tell `finish_decl' to ignore the initializer once it is parsed. */
2537 switch (TREE_CODE (decl))
2540 error ("typedef `%s' is initialized (use __typeof__ instead)",
2541 IDENTIFIER_POINTER (DECL_NAME (decl)));
2546 error ("function `%s' is initialized like a variable",
2547 IDENTIFIER_POINTER (DECL_NAME (decl)));
2552 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
2553 error ("parameter `%s' is initialized",
2554 IDENTIFIER_POINTER (DECL_NAME (decl)));
2559 /* Don't allow initializations for incomplete types
2560 except for arrays which might be completed by the initialization. */
2562 /* This can happen if the array size is an undefined macro. We already
2563 gave a warning, so we don't need another one. */
2564 if (TREE_TYPE (decl) == error_mark_node)
2566 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
2568 /* A complete type is ok if size is fixed. */
2570 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
2571 || C_DECL_VARIABLE_SIZE (decl))
2573 error ("variable-sized object may not be initialized");
2577 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
2579 error ("variable `%s' has initializer but incomplete type",
2580 IDENTIFIER_POINTER (DECL_NAME (decl)));
2583 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
2585 error ("elements of array `%s' have incomplete type",
2586 IDENTIFIER_POINTER (DECL_NAME (decl)));
2593 DECL_EXTERNAL (decl) = 0;
2594 if (current_scope == global_scope)
2595 TREE_STATIC (decl) = 1;
2597 /* Tell `pushdecl' this is an initialized decl
2598 even though we don't yet have the initializer expression.
2599 Also tell `finish_decl' it may store the real initializer. */
2600 DECL_INITIAL (decl) = error_mark_node;
2603 /* If this is a function declaration, write a record describing it to the
2604 prototypes file (if requested). */
2606 if (TREE_CODE (decl) == FUNCTION_DECL)
2607 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
2609 /* ANSI specifies that a tentative definition which is not merged with
2610 a non-tentative definition behaves exactly like a definition with an
2611 initializer equal to zero. (Section 3.7.2)
2613 -fno-common gives strict ANSI behavior, though this tends to break
2614 a large body of code that grew up without this rule.
2616 Thread-local variables are never common, since there's no entrenched
2617 body of code to break, and it allows more efficient variable references
2618 in the presence of dynamic linking. */
2620 if (TREE_CODE (decl) == VAR_DECL
2622 && TREE_PUBLIC (decl)
2623 && !DECL_THREAD_LOCAL (decl)
2625 DECL_COMMON (decl) = 1;
2627 /* Set attributes here so if duplicate decl, will have proper attributes. */
2628 decl_attributes (&decl, attributes, 0);
2630 if (TREE_CODE (decl) == FUNCTION_DECL
2631 && targetm.calls.promote_prototypes (TREE_TYPE (decl)))
2633 tree ce = declarator;
2635 if (TREE_CODE (ce) == INDIRECT_REF)
2636 ce = TREE_OPERAND (declarator, 0);
2637 if (TREE_CODE (ce) == CALL_EXPR)
2639 tree args = TREE_PURPOSE (TREE_OPERAND (ce, 1));
2640 for (; args; args = TREE_CHAIN (args))
2642 tree type = TREE_TYPE (args);
2643 if (INTEGRAL_TYPE_P (type)
2644 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
2645 DECL_ARG_TYPE (args) = integer_type_node;
2650 if (TREE_CODE (decl) == FUNCTION_DECL
2651 && DECL_DECLARED_INLINE_P (decl)
2652 && DECL_UNINLINABLE (decl)
2653 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
2654 warning ("%Jinline function '%D' given attribute noinline", decl, decl);
2656 /* Add this decl to the current scope.
2657 TEM may equal DECL or it may be a previous decl of the same name. */
2658 tem = pushdecl (decl);
2660 /* For a local variable, define the RTL now. */
2661 if (current_scope != global_scope
2662 /* But not if this is a duplicate decl
2663 and we preserved the rtl from the previous one
2664 (which may or may not happen). */
2665 && !DECL_RTL_SET_P (tem)
2666 && DECL_FILE_SCOPE_P (tem))
2668 if (TREE_TYPE (tem) != error_mark_node
2669 && (COMPLETE_TYPE_P (TREE_TYPE (tem))
2670 || (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
2671 && DECL_INITIAL (tem) != 0)))
2678 /* Finish processing of a declaration;
2679 install its initial value.
2680 If the length of an array type is not known before,
2681 it must be determined now, from the initial value, or it is an error. */
2684 finish_decl (tree decl, tree init, tree asmspec_tree)
2686 tree type = TREE_TYPE (decl);
2687 int was_incomplete = (DECL_SIZE (decl) == 0);
2688 const char *asmspec = 0;
2690 /* If a name was specified, get the string. */
2691 if (current_scope == global_scope)
2692 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
2694 asmspec = TREE_STRING_POINTER (asmspec_tree);
2696 /* If `start_decl' didn't like having an initialization, ignore it now. */
2697 if (init != 0 && DECL_INITIAL (decl) == 0)
2700 /* Don't crash if parm is initialized. */
2701 if (TREE_CODE (decl) == PARM_DECL)
2705 store_init_value (decl, init);
2707 if (c_dialect_objc () && (TREE_CODE (decl) == VAR_DECL
2708 || TREE_CODE (decl) == FUNCTION_DECL
2709 || TREE_CODE (decl) == FIELD_DECL))
2710 objc_check_decl (decl);
2712 /* Deduce size of array from initialization, if not already known. */
2713 if (TREE_CODE (type) == ARRAY_TYPE
2714 && TYPE_DOMAIN (type) == 0
2715 && TREE_CODE (decl) != TYPE_DECL)
2718 = (TREE_STATIC (decl)
2719 /* Even if pedantic, an external linkage array
2720 may have incomplete type at first. */
2721 ? pedantic && !TREE_PUBLIC (decl)
2722 : !DECL_EXTERNAL (decl));
2724 = complete_array_type (type, DECL_INITIAL (decl), do_default);
2726 /* Get the completed type made by complete_array_type. */
2727 type = TREE_TYPE (decl);
2730 error ("%Jinitializer fails to determine size of '%D'", decl, decl);
2732 else if (failure == 2)
2735 error ("%Jarray size missing in '%D'", decl, decl);
2736 /* If a `static' var's size isn't known,
2737 make it extern as well as static, so it does not get
2739 If it is not `static', then do not mark extern;
2740 finish_incomplete_decl will give it a default size
2741 and it will get allocated. */
2742 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
2743 DECL_EXTERNAL (decl) = 1;
2746 /* TYPE_MAX_VALUE is always one less than the number of elements
2747 in the array, because we start counting at zero. Therefore,
2748 warn only if the value is less than zero. */
2749 else if (pedantic && TYPE_DOMAIN (type) != 0
2750 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
2751 error ("%Jzero or negative size array '%D'", decl, decl);
2753 layout_decl (decl, 0);
2756 if (TREE_CODE (decl) == VAR_DECL)
2758 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
2759 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
2760 layout_decl (decl, 0);
2762 if (DECL_SIZE (decl) == 0
2763 /* Don't give an error if we already gave one earlier. */
2764 && TREE_TYPE (decl) != error_mark_node
2765 && (TREE_STATIC (decl)
2767 /* A static variable with an incomplete type
2768 is an error if it is initialized.
2769 Also if it is not file scope.
2770 Otherwise, let it through, but if it is not `extern'
2771 then it may cause an error message later. */
2772 (DECL_INITIAL (decl) != 0
2773 || !DECL_FILE_SCOPE_P (decl))
2775 /* An automatic variable with an incomplete type
2777 !DECL_EXTERNAL (decl)))
2779 error ("%Jstorage size of '%D' isn't known", decl, decl);
2780 TREE_TYPE (decl) = error_mark_node;
2783 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
2784 && DECL_SIZE (decl) != 0)
2786 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
2787 constant_expression_warning (DECL_SIZE (decl));
2789 error ("%Jstorage size of '%D' isn't constant", decl, decl);
2792 if (TREE_USED (type))
2793 TREE_USED (decl) = 1;
2796 /* If this is a function and an assembler name is specified, reset DECL_RTL
2797 so we can give it its new name. Also, update built_in_decls if it
2798 was a normal built-in. */
2799 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
2801 /* ASMSPEC is given, and not the name of a register. Mark the
2802 name with a star so assemble_name won't munge it. */
2803 char *starred = alloca (strlen (asmspec) + 2);
2805 strcpy (starred + 1, asmspec);
2807 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL)
2809 tree builtin = built_in_decls [DECL_FUNCTION_CODE (decl)];
2810 SET_DECL_RTL (builtin, NULL_RTX);
2811 SET_DECL_ASSEMBLER_NAME (builtin, get_identifier (starred));
2812 #ifdef TARGET_MEM_FUNCTIONS
2813 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMCPY)
2814 init_block_move_fn (starred);
2815 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_MEMSET)
2816 init_block_clear_fn (starred);
2818 if (DECL_FUNCTION_CODE (decl) == BUILT_IN_BCOPY)
2819 init_block_move_fn (starred);
2820 else if (DECL_FUNCTION_CODE (decl) == BUILT_IN_BZERO)
2821 init_block_clear_fn (starred);
2824 SET_DECL_RTL (decl, NULL_RTX);
2825 change_decl_assembler_name (decl, get_identifier (starred));
2828 /* If #pragma weak was used, mark the decl weak now. */
2829 if (current_scope == global_scope)
2830 maybe_apply_pragma_weak (decl);
2832 /* Output the assembler code and/or RTL code for variables and functions,
2833 unless the type is an undefined structure or union.
2834 If not, it will get done when the type is completed. */
2836 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
2838 /* This is a no-op in c-lang.c or something real in objc-act.c. */
2839 if (c_dialect_objc ())
2840 objc_check_decl (decl);
2842 if (DECL_FILE_SCOPE_P (decl))
2844 if (DECL_INITIAL (decl) == NULL_TREE
2845 || DECL_INITIAL (decl) == error_mark_node)
2846 /* Don't output anything
2847 when a tentative file-scope definition is seen.
2848 But at end of compilation, do output code for them. */
2849 DECL_DEFER_OUTPUT (decl) = 1;
2850 rest_of_decl_compilation (decl, asmspec, true, 0);
2854 /* This is a local variable. If there is an ASMSPEC, the
2855 user has requested that we handle it specially. */
2858 /* In conjunction with an ASMSPEC, the `register'
2859 keyword indicates that we should place the variable
2860 in a particular register. */
2861 if (DECL_REGISTER (decl))
2862 DECL_C_HARD_REGISTER (decl) = 1;
2864 /* If this is not a static variable, issue a warning.
2865 It doesn't make any sense to give an ASMSPEC for an
2866 ordinary, non-register local variable. Historically,
2867 GCC has accepted -- but ignored -- the ASMSPEC in
2869 if (TREE_CODE (decl) == VAR_DECL
2870 && !DECL_REGISTER (decl)
2871 && !TREE_STATIC (decl))
2872 warning ("%Jignoring asm-specifier for non-static local "
2873 "variable '%D'", decl, decl);
2875 change_decl_assembler_name (decl, get_identifier (asmspec));
2878 if (TREE_CODE (decl) != FUNCTION_DECL)
2879 add_decl_stmt (decl);
2882 if (!DECL_FILE_SCOPE_P (decl))
2884 /* Recompute the RTL of a local array now
2885 if it used to be an incomplete type. */
2887 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
2889 /* If we used it already as memory, it must stay in memory. */
2890 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
2891 /* If it's still incomplete now, no init will save it. */
2892 if (DECL_SIZE (decl) == 0)
2893 DECL_INITIAL (decl) = 0;
2898 /* If this was marked 'used', be sure it will be output. */
2899 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
2900 mark_referenced (DECL_ASSEMBLER_NAME (decl));
2902 if (TREE_CODE (decl) == TYPE_DECL)
2903 rest_of_decl_compilation (decl, NULL, DECL_FILE_SCOPE_P (decl), 0);
2905 /* At the end of a declaration, throw away any variable type sizes
2906 of types defined inside that declaration. There is no use
2907 computing them in the following function definition. */
2908 if (current_scope == global_scope)
2909 get_pending_sizes ();
2911 /* Install a cleanup (aka destructor) if one was given. */
2912 if (TREE_CODE (decl) == VAR_DECL && !TREE_STATIC (decl))
2914 tree attr = lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl));
2917 static bool eh_initialized_p;
2919 tree cleanup_id = TREE_VALUE (TREE_VALUE (attr));
2920 tree cleanup_decl = lookup_name (cleanup_id);
2923 /* Build "cleanup(&decl)" for the destructor. */
2924 cleanup = build_unary_op (ADDR_EXPR, decl, 0);
2925 cleanup = build_tree_list (NULL_TREE, cleanup);
2926 cleanup = build_function_call (cleanup_decl, cleanup);
2928 /* Don't warn about decl unused; the cleanup uses it. */
2929 TREE_USED (decl) = 1;
2931 /* Initialize EH, if we've been told to do so. */
2932 if (flag_exceptions && !eh_initialized_p)
2934 eh_initialized_p = true;
2935 eh_personality_libfunc
2936 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
2937 ? "__gcc_personality_sj0"
2938 : "__gcc_personality_v0");
2939 using_eh_for_cleanups ();
2942 add_stmt (build_stmt (CLEANUP_STMT, decl, cleanup));
2947 /* Given a parsed parameter declaration, decode it into a PARM_DECL
2948 and push that on the current scope. */
2951 push_parm_decl (tree parm)
2955 /* Don't attempt to expand sizes while parsing this decl.
2956 (We can get here with i_s_e 1 somehow from Objective-C.) */
2957 int save_immediate_size_expand = immediate_size_expand;
2958 immediate_size_expand = 0;
2960 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
2961 TREE_PURPOSE (TREE_PURPOSE (parm)),
2963 decl_attributes (&decl, TREE_VALUE (parm), 0);
2965 decl = pushdecl (decl);
2967 finish_decl (decl, NULL_TREE, NULL_TREE);
2969 immediate_size_expand = save_immediate_size_expand;
2972 /* Mark all the parameter declarations to date as forward decls,
2973 shift them to the variables list, and reset the parameters list.
2974 Also diagnose use of this extension. */
2977 mark_forward_parm_decls (void)
2981 if (pedantic && !current_scope->warned_forward_parm_decls)
2983 pedwarn ("ISO C forbids forward parameter declarations");
2984 current_scope->warned_forward_parm_decls = true;
2987 for (parm = current_scope->parms; parm; parm = TREE_CHAIN (parm))
2988 TREE_ASM_WRITTEN (parm) = 1;
2990 SCOPE_LIST_CONCAT (current_scope, names, current_scope, parms);
2991 current_scope->parms = 0;
2992 current_scope->parms_last = 0;
2995 static GTY(()) int compound_literal_number;
2997 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
2998 literal, which may be an incomplete array type completed by the
2999 initializer; INIT is a CONSTRUCTOR that initializes the compound
3003 build_compound_literal (tree type, tree init)
3005 /* We do not use start_decl here because we have a type, not a declarator;
3006 and do not use finish_decl because the decl should be stored inside
3007 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_STMT. */
3008 tree decl = build_decl (VAR_DECL, NULL_TREE, type);
3011 DECL_EXTERNAL (decl) = 0;
3012 TREE_PUBLIC (decl) = 0;
3013 TREE_STATIC (decl) = (current_scope == global_scope);
3014 DECL_CONTEXT (decl) = current_function_decl;
3015 TREE_USED (decl) = 1;
3016 TREE_TYPE (decl) = type;
3017 TREE_READONLY (decl) = TREE_READONLY (type);
3018 store_init_value (decl, init);
3020 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3022 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3027 type = TREE_TYPE (decl);
3028 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3029 return error_mark_node;
3031 stmt = build_stmt (DECL_STMT, decl);
3032 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3033 TREE_SIDE_EFFECTS (complit) = 1;
3035 layout_decl (decl, 0);
3037 if (TREE_STATIC (decl))
3039 /* This decl needs a name for the assembler output. We also need
3040 a unique suffix to be added to the name. */
3043 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal",
3044 compound_literal_number);
3045 compound_literal_number++;
3046 DECL_NAME (decl) = get_identifier (name);
3047 DECL_DEFER_OUTPUT (decl) = 1;
3048 DECL_COMDAT (decl) = 1;
3049 DECL_ARTIFICIAL (decl) = 1;
3051 rest_of_decl_compilation (decl, NULL, 1, 0);
3057 /* Make TYPE a complete type based on INITIAL_VALUE.
3058 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3059 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3062 complete_array_type (tree type, tree initial_value, int do_default)
3064 tree maxindex = NULL_TREE;
3069 /* Note MAXINDEX is really the maximum index,
3070 one less than the size. */
3071 if (TREE_CODE (initial_value) == STRING_CST)
3074 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3075 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3078 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3080 tree elts = CONSTRUCTOR_ELTS (initial_value);
3081 maxindex = build_int_2 (-1, -1);
3082 for (; elts; elts = TREE_CHAIN (elts))
3084 if (TREE_PURPOSE (elts))
3085 maxindex = TREE_PURPOSE (elts);
3087 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3088 maxindex, integer_one_node));
3090 maxindex = copy_node (maxindex);
3094 /* Make an error message unless that happened already. */
3095 if (initial_value != error_mark_node)
3098 /* Prevent further error messages. */
3099 maxindex = build_int_2 (0, 0);
3106 maxindex = build_int_2 (0, 0);
3112 TYPE_DOMAIN (type) = build_index_type (maxindex);
3113 if (!TREE_TYPE (maxindex))
3114 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3117 /* Lay out the type now that we can get the real answer. */
3124 /* Determine whether TYPE is a structure with a flexible array member,
3125 or a union containing such a structure (possibly recursively). */
3128 flexible_array_type_p (tree type)
3131 switch (TREE_CODE (type))
3134 x = TYPE_FIELDS (type);
3137 while (TREE_CHAIN (x) != NULL_TREE)
3139 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
3140 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
3141 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
3142 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
3146 for (x = TYPE_FIELDS (type); x != NULL_TREE; x = TREE_CHAIN (x))
3148 if (flexible_array_type_p (TREE_TYPE (x)))
3157 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3158 replacing with appropriate values if they are invalid. */
3160 check_bitfield_type_and_width (tree *type, tree *width, const char *orig_name)
3163 unsigned int max_width;
3164 unsigned HOST_WIDE_INT w;
3165 const char *name = orig_name ? orig_name: _("<anonymous>");
3168 STRIP_NOPS (*width);
3170 /* Detect and ignore out of range field width and process valid
3172 if (TREE_CODE (*width) != INTEGER_CST)
3174 error ("bit-field `%s' width not an integer constant", name);
3175 *width = integer_one_node;
3179 constant_expression_warning (*width);
3180 if (tree_int_cst_sgn (*width) < 0)
3182 error ("negative width in bit-field `%s'", name);
3183 *width = integer_one_node;
3185 else if (integer_zerop (*width) && orig_name)
3187 error ("zero width for bit-field `%s'", name);
3188 *width = integer_one_node;
3192 /* Detect invalid bit-field type. */
3193 if (TREE_CODE (*type) != INTEGER_TYPE
3194 && TREE_CODE (*type) != BOOLEAN_TYPE
3195 && TREE_CODE (*type) != ENUMERAL_TYPE)
3197 error ("bit-field `%s' has invalid type", name);
3198 *type = unsigned_type_node;
3201 type_mv = TYPE_MAIN_VARIANT (*type);
3203 && type_mv != integer_type_node
3204 && type_mv != unsigned_type_node
3205 && type_mv != boolean_type_node)
3206 pedwarn ("type of bit-field `%s' is a GCC extension", name);
3208 if (type_mv == boolean_type_node)
3209 max_width = CHAR_TYPE_SIZE;
3211 max_width = TYPE_PRECISION (*type);
3213 if (0 < compare_tree_int (*width, max_width))
3215 error ("width of `%s' exceeds its type", name);
3217 *width = build_int_2 (w, 0);
3220 w = tree_low_cst (*width, 1);
3222 if (TREE_CODE (*type) == ENUMERAL_TYPE
3223 && (w < min_precision (TYPE_MIN_VALUE (*type), TREE_UNSIGNED (*type))
3224 || w < min_precision (TYPE_MAX_VALUE (*type), TREE_UNSIGNED (*type))))
3225 warning ("`%s' is narrower than values of its type", name);
3228 /* Given declspecs and a declarator,
3229 determine the name and type of the object declared
3230 and construct a ..._DECL node for it.
3231 (In one case we can return a ..._TYPE node instead.
3232 For invalid input we sometimes return 0.)
3234 DECLSPECS is a chain of tree_list nodes whose value fields
3235 are the storage classes and type specifiers.
3237 DECL_CONTEXT says which syntactic context this declaration is in:
3238 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3239 FUNCDEF for a function definition. Like NORMAL but a few different
3240 error messages in each case. Return value may be zero meaning
3241 this definition is too screwy to try to parse.
3242 PARM for a parameter declaration (either within a function prototype
3243 or before a function body). Make a PARM_DECL, or return void_type_node.
3244 TYPENAME if for a typename (in a cast or sizeof).
3245 Don't make a DECL node; just return the ..._TYPE node.
3246 FIELD for a struct or union field; make a FIELD_DECL.
3247 INITIALIZED is 1 if the decl has an initializer.
3248 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3249 representing the width of the bit-field.
3251 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3252 It may also be so in the PARM case, for a prototype where the
3253 argument type is specified but not the name.
3255 This function is where the complicated C meanings of `static'
3256 and `extern' are interpreted. */
3259 grokdeclarator (tree declarator, tree declspecs,
3260 enum decl_context decl_context, int initialized, tree *width)
3264 tree type = NULL_TREE;
3269 int type_quals = TYPE_UNQUALIFIED;
3271 int explicit_int = 0;
3272 int explicit_char = 0;
3273 int defaulted_int = 0;
3274 tree typedef_decl = 0;
3275 const char *name, *orig_name;
3276 tree typedef_type = 0;
3277 int funcdef_flag = 0;
3278 enum tree_code innermost_code = ERROR_MARK;
3279 int size_varies = 0;
3280 tree decl_attr = NULL_TREE;
3281 tree array_ptr_quals = NULL_TREE;
3282 int array_parm_static = 0;
3283 tree returned_attrs = NULL_TREE;
3284 bool bitfield = width != NULL;
3287 if (decl_context == FUNCDEF)
3288 funcdef_flag = 1, decl_context = NORMAL;
3290 /* Look inside a declarator for the name being declared
3291 and get it as a string, for an error message. */
3293 tree decl = declarator;
3297 switch (TREE_CODE (decl))
3302 innermost_code = TREE_CODE (decl);
3303 decl = TREE_OPERAND (decl, 0);
3307 decl = TREE_VALUE (decl);
3310 case IDENTIFIER_NODE:
3311 name = IDENTIFIER_POINTER (decl);
3323 /* A function definition's declarator must have the form of
3324 a function declarator. */
3326 if (funcdef_flag && innermost_code != CALL_EXPR)
3329 /* If this looks like a function definition, make it one,
3330 even if it occurs where parms are expected.
3331 Then store_parm_decls will reject it and not use it as a parm. */
3332 if (decl_context == NORMAL && !funcdef_flag
3333 && current_scope->parm_flag)
3334 decl_context = PARM;
3336 /* Look through the decl specs and record which ones appear.
3337 Some typespecs are defined as built-in typenames.
3338 Others, the ones that are modifiers of other types,
3339 are represented by bits in SPECBITS: set the bits for
3340 the modifiers that appear. Storage class keywords are also in SPECBITS.
3342 If there is a typedef name or a type, store the type in TYPE.
3343 This includes builtin typedefs such as `int'.
3345 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3346 and did not come from a user typedef.
3348 Set LONGLONG if `long' is mentioned twice. */
3350 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3352 tree id = TREE_VALUE (spec);
3354 /* If the entire declaration is itself tagged as deprecated then
3355 suppress reports of deprecated items. */
3356 if (id && TREE_DEPRECATED (id))
3358 if (deprecated_state != DEPRECATED_SUPPRESS)
3359 warn_deprecated_use (id);
3362 if (id == ridpointers[(int) RID_INT])
3364 if (id == ridpointers[(int) RID_CHAR])
3367 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3369 enum rid i = C_RID_CODE (id);
3370 if ((int) i <= (int) RID_LAST_MODIFIER)
3372 if (i == RID_LONG && (specbits & (1 << (int) RID_LONG)))
3375 error ("`long long long' is too long for GCC");
3378 if (pedantic && !flag_isoc99 && ! in_system_header
3380 pedwarn ("ISO C90 does not support `long long'");
3384 else if (specbits & (1 << (int) i))
3386 if (i == RID_CONST || i == RID_VOLATILE || i == RID_RESTRICT)
3388 if (pedantic && !flag_isoc99)
3389 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3392 error ("duplicate `%s'", IDENTIFIER_POINTER (id));
3395 /* Diagnose "__thread extern". Recall that this list
3396 is in the reverse order seen in the text. */
3398 && (specbits & (1 << (int) RID_EXTERN
3399 | 1 << (int) RID_STATIC)))
3401 if (specbits & 1 << (int) RID_EXTERN)
3402 error ("`__thread' before `extern'");
3404 error ("`__thread' before `static'");
3407 specbits |= 1 << (int) i;
3412 error ("two or more data types in declaration of `%s'", name);
3413 /* Actual typedefs come to us as TYPE_DECL nodes. */
3414 else if (TREE_CODE (id) == TYPE_DECL)
3416 if (TREE_TYPE (id) == error_mark_node)
3417 ; /* Allow the type to default to int to avoid cascading errors. */
3420 type = TREE_TYPE (id);
3421 decl_attr = DECL_ATTRIBUTES (id);
3425 /* Built-in types come as identifiers. */
3426 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3428 tree t = lookup_name (id);
3429 if (TREE_TYPE (t) == error_mark_node)
3431 else if (!t || TREE_CODE (t) != TYPE_DECL)
3432 error ("`%s' fails to be a typedef or built in type",
3433 IDENTIFIER_POINTER (id));
3436 type = TREE_TYPE (t);
3440 else if (TREE_CODE (id) != ERROR_MARK)
3447 typedef_type = type;
3449 size_varies = C_TYPE_VARIABLE_SIZE (type);
3451 /* No type at all: default to `int', and set DEFAULTED_INT
3452 because it was not a user-defined typedef. */
3456 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3457 | (1 << (int) RID_SIGNED)
3458 | (1 << (int) RID_UNSIGNED)
3459 | (1 << (int) RID_COMPLEX))))
3460 /* Don't warn about typedef foo = bar. */
3461 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
3462 && ! in_system_header)
3464 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
3465 and this is a function, or if -Wimplicit; prefer the former
3466 warning since it is more explicit. */
3467 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3469 warn_about_return_type = 1;
3470 else if (warn_implicit_int || flag_isoc99)
3471 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
3476 type = integer_type_node;
3479 /* Now process the modifiers that were specified
3480 and check for invalid combinations. */
3482 /* Long double is a special combination. */
3484 if ((specbits & 1 << (int) RID_LONG) && ! longlong
3485 && TYPE_MAIN_VARIANT (type) == double_type_node)
3487 specbits &= ~(1 << (int) RID_LONG);
3488 type = long_double_type_node;
3491 /* Check all other uses of type modifiers. */
3493 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3494 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3498 if ((specbits & 1 << (int) RID_LONG)
3499 && (specbits & 1 << (int) RID_SHORT))
3500 error ("both long and short specified for `%s'", name);
3501 else if (((specbits & 1 << (int) RID_LONG)
3502 || (specbits & 1 << (int) RID_SHORT))
3504 error ("long or short specified with char for `%s'", name);
3505 else if (((specbits & 1 << (int) RID_LONG)
3506 || (specbits & 1 << (int) RID_SHORT))
3507 && TREE_CODE (type) == REAL_TYPE)
3509 static int already = 0;
3511 error ("long or short specified with floating type for `%s'", name);
3512 if (! already && ! pedantic)
3514 error ("the only valid combination is `long double'");
3518 else if ((specbits & 1 << (int) RID_SIGNED)
3519 && (specbits & 1 << (int) RID_UNSIGNED))
3520 error ("both signed and unsigned specified for `%s'", name);
3521 else if (TREE_CODE (type) != INTEGER_TYPE)
3522 error ("long, short, signed or unsigned invalid for `%s'", name);
3526 if (!explicit_int && !defaulted_int && !explicit_char)
3528 error ("long, short, signed or unsigned used invalidly for `%s'",
3534 /* Discard the type modifiers if they are invalid. */
3537 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3538 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
3543 if ((specbits & (1 << (int) RID_COMPLEX))
3544 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
3546 error ("complex invalid for `%s'", name);
3547 specbits &= ~(1 << (int) RID_COMPLEX);
3550 /* Decide whether an integer type is signed or not.
3551 Optionally treat bit-fields as signed by default. */
3552 if (specbits & 1 << (int) RID_UNSIGNED
3553 || (bitfield && ! flag_signed_bitfields
3554 && (explicit_int || defaulted_int || explicit_char
3555 /* A typedef for plain `int' without `signed'
3556 can be controlled just like plain `int'. */
3557 || ! (typedef_decl != 0
3558 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
3559 && TREE_CODE (type) != ENUMERAL_TYPE
3560 && !(specbits & 1 << (int) RID_SIGNED)))
3563 type = long_long_unsigned_type_node;
3564 else if (specbits & 1 << (int) RID_LONG)
3565 type = long_unsigned_type_node;
3566 else if (specbits & 1 << (int) RID_SHORT)
3567 type = short_unsigned_type_node;
3568 else if (type == char_type_node)
3569 type = unsigned_char_type_node;
3570 else if (typedef_decl)
3571 type = c_common_unsigned_type (type);
3573 type = unsigned_type_node;
3575 else if ((specbits & 1 << (int) RID_SIGNED)
3576 && type == char_type_node)
3577 type = signed_char_type_node;
3579 type = long_long_integer_type_node;
3580 else if (specbits & 1 << (int) RID_LONG)
3581 type = long_integer_type_node;
3582 else if (specbits & 1 << (int) RID_SHORT)
3583 type = short_integer_type_node;
3585 if (specbits & 1 << (int) RID_COMPLEX)
3587 if (pedantic && !flag_isoc99)
3588 pedwarn ("ISO C90 does not support complex types");
3589 /* If we just have "complex", it is equivalent to
3590 "complex double", but if any modifiers at all are specified it is
3591 the complex form of TYPE. E.g, "complex short" is
3592 "complex short int". */
3594 if (defaulted_int && ! longlong
3595 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3596 | (1 << (int) RID_SIGNED)
3597 | (1 << (int) RID_UNSIGNED))))
3600 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
3601 type = complex_double_type_node;
3603 else if (type == integer_type_node)
3606 pedwarn ("ISO C does not support complex integer types");
3607 type = complex_integer_type_node;
3609 else if (type == float_type_node)
3610 type = complex_float_type_node;
3611 else if (type == double_type_node)
3612 type = complex_double_type_node;
3613 else if (type == long_double_type_node)
3614 type = complex_long_double_type_node;
3618 pedwarn ("ISO C does not support complex integer types");
3619 type = build_complex_type (type);
3623 /* Check the type and width of a bit-field. */
3625 check_bitfield_type_and_width (&type, width, orig_name);
3627 /* Figure out the type qualifiers for the declaration. There are
3628 two ways a declaration can become qualified. One is something
3629 like `const int i' where the `const' is explicit. Another is
3630 something like `typedef const int CI; CI i' where the type of the
3631 declaration contains the `const'. A third possibility is that
3632 there is a type qualifier on the element type of a typedefed
3633 array type, in which case we should extract that qualifier so
3634 that c_apply_type_quals_to_decls receives the full list of
3635 qualifiers to work with (C90 is not entirely clear about whether
3636 duplicate qualifiers should be diagnosed in this case, but it
3637 seems most appropriate to do so). */
3638 element_type = strip_array_types (type);
3639 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (element_type);
3641 = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (element_type);
3643 = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (element_type);
3644 inlinep = !! (specbits & (1 << (int) RID_INLINE));
3645 if (pedantic && !flag_isoc99)
3648 pedwarn ("duplicate `const'");
3650 pedwarn ("duplicate `restrict'");
3652 pedwarn ("duplicate `volatile'");
3654 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
3655 type = TYPE_MAIN_VARIANT (type);
3656 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
3657 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
3658 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
3660 /* Warn if two storage classes are given. Default to `auto'. */
3665 if (specbits & 1 << (int) RID_AUTO) nclasses++;
3666 if (specbits & 1 << (int) RID_STATIC) nclasses++;
3667 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
3668 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
3669 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
3671 /* "static __thread" and "extern __thread" are allowed. */
3672 if ((specbits & (1 << (int) RID_THREAD
3673 | 1 << (int) RID_STATIC
3674 | 1 << (int) RID_EXTERN)) == (1 << (int) RID_THREAD))
3677 /* Warn about storage classes that are invalid for certain
3678 kinds of declarations (parameters, typenames, etc.). */
3681 error ("multiple storage classes in declaration of `%s'", name);
3682 else if (funcdef_flag
3684 & ((1 << (int) RID_REGISTER)
3685 | (1 << (int) RID_AUTO)
3686 | (1 << (int) RID_TYPEDEF)
3687 | (1 << (int) RID_THREAD))))
3689 if (specbits & 1 << (int) RID_AUTO
3690 && (pedantic || current_scope == global_scope))
3691 pedwarn ("function definition declared `auto'");
3692 if (specbits & 1 << (int) RID_REGISTER)
3693 error ("function definition declared `register'");
3694 if (specbits & 1 << (int) RID_TYPEDEF)
3695 error ("function definition declared `typedef'");
3696 if (specbits & 1 << (int) RID_THREAD)
3697 error ("function definition declared `__thread'");
3698 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3699 | (1 << (int) RID_AUTO) | (1 << (int) RID_THREAD));
3701 else if (decl_context != NORMAL && nclasses > 0)
3703 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
3707 switch (decl_context)
3710 error ("storage class specified for structure field `%s'",
3714 error ("storage class specified for parameter `%s'", name);
3717 error ("storage class specified for typename");
3720 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3721 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
3722 | (1 << (int) RID_EXTERN) | (1 << (int) RID_THREAD));
3725 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
3727 /* `extern' with initialization is invalid if not at file scope. */
3728 if (current_scope == global_scope)
3729 warning ("`%s' initialized and declared `extern'", name);
3731 error ("`%s' has both `extern' and initializer", name);
3733 else if (current_scope == global_scope)
3735 if (specbits & 1 << (int) RID_AUTO)
3736 error ("file-scope declaration of `%s' specifies `auto'", name);
3740 if (specbits & 1 << (int) RID_EXTERN && funcdef_flag)
3741 error ("nested function `%s' declared `extern'", name);
3742 else if ((specbits & (1 << (int) RID_THREAD
3743 | 1 << (int) RID_EXTERN
3744 | 1 << (int) RID_STATIC))
3745 == (1 << (int) RID_THREAD))
3747 error ("function-scope `%s' implicitly auto and declared `__thread'",
3749 specbits &= ~(1 << (int) RID_THREAD);
3754 /* Now figure out the structure of the declarator proper.
3755 Descend through it, creating more complex types, until we reach
3756 the declared identifier (or NULL_TREE, in an absolute declarator). */
3758 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
3760 if (type == error_mark_node)
3762 declarator = TREE_OPERAND (declarator, 0);
3766 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
3767 an INDIRECT_REF (for *...),
3768 a CALL_EXPR (for ...(...)),
3769 a TREE_LIST (for nested attributes),
3770 an identifier (for the name being declared)
3771 or a null pointer (for the place in an absolute declarator
3772 where the name was omitted).
3773 For the last two cases, we have just exited the loop.
3775 At this point, TYPE is the type of elements of an array,
3776 or for a function to return, or for a pointer to point to.
3777 After this sequence of ifs, TYPE is the type of the
3778 array or function or pointer, and DECLARATOR has had its
3779 outermost layer removed. */
3781 if (array_ptr_quals != NULL_TREE || array_parm_static)
3783 /* Only the innermost declarator (making a parameter be of
3784 array type which is converted to pointer type)
3785 may have static or type qualifiers. */
3786 error ("static or type qualifiers in non-parameter array declarator");
3787 array_ptr_quals = NULL_TREE;
3788 array_parm_static = 0;
3791 if (TREE_CODE (declarator) == TREE_LIST)
3793 /* We encode a declarator with embedded attributes using
3795 tree attrs = TREE_PURPOSE (declarator);
3798 declarator = TREE_VALUE (declarator);
3799 inner_decl = declarator;
3800 while (inner_decl != NULL_TREE
3801 && TREE_CODE (inner_decl) == TREE_LIST)
3802 inner_decl = TREE_VALUE (inner_decl);
3803 if (inner_decl == NULL_TREE
3804 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
3805 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
3806 else if (TREE_CODE (inner_decl) == CALL_EXPR)
3807 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
3808 else if (TREE_CODE (inner_decl) == ARRAY_REF)
3809 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
3810 returned_attrs = decl_attributes (&type,
3811 chainon (returned_attrs, attrs),
3814 else if (TREE_CODE (declarator) == ARRAY_REF)
3816 tree itype = NULL_TREE;
3817 tree size = TREE_OPERAND (declarator, 1);
3818 /* The index is a signed object `sizetype' bits wide. */
3819 tree index_type = c_common_signed_type (sizetype);
3821 array_ptr_quals = TREE_TYPE (declarator);
3822 array_parm_static = TREE_STATIC (declarator);
3824 declarator = TREE_OPERAND (declarator, 0);
3826 /* Check for some types that there cannot be arrays of. */
3828 if (VOID_TYPE_P (type))
3830 error ("declaration of `%s' as array of voids", name);
3831 type = error_mark_node;
3834 if (TREE_CODE (type) == FUNCTION_TYPE)
3836 error ("declaration of `%s' as array of functions", name);
3837 type = error_mark_node;
3840 if (pedantic && !in_system_header && flexible_array_type_p (type))
3841 pedwarn ("invalid use of structure with flexible array member");
3843 if (size == error_mark_node)
3844 type = error_mark_node;
3846 if (type == error_mark_node)
3849 /* If size was specified, set ITYPE to a range-type for that size.
3850 Otherwise, ITYPE remains null. finish_decl may figure it out
3851 from an initial value. */
3855 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3856 STRIP_TYPE_NOPS (size);
3858 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
3860 error ("size of array `%s' has non-integer type", name);
3861 size = integer_one_node;
3864 if (pedantic && integer_zerop (size))
3865 pedwarn ("ISO C forbids zero-size array `%s'", name);
3867 if (TREE_CODE (size) == INTEGER_CST)
3869 constant_expression_warning (size);
3870 if (tree_int_cst_sgn (size) < 0)
3872 error ("size of array `%s' is negative", name);
3873 size = integer_one_node;
3878 /* Make sure the array size remains visibly nonconstant
3879 even if it is (eg) a const variable with known value. */
3882 if (!flag_isoc99 && pedantic)
3884 if (TREE_CONSTANT (size))
3885 pedwarn ("ISO C90 forbids array `%s' whose size can't be evaluated",
3888 pedwarn ("ISO C90 forbids variable-size array `%s'",
3893 if (integer_zerop (size))
3895 /* A zero-length array cannot be represented with an
3896 unsigned index type, which is what we'll get with
3897 build_index_type. Create an open-ended range instead. */
3898 itype = build_range_type (sizetype, size, NULL_TREE);
3902 /* Compute the maximum valid index, that is, size - 1.
3903 Do the calculation in index_type, so that if it is
3904 a variable the computations will be done in the
3906 itype = fold (build (MINUS_EXPR, index_type,
3907 convert (index_type, size),
3908 convert (index_type, size_one_node)));
3910 /* If that overflowed, the array is too big.
3911 ??? While a size of INT_MAX+1 technically shouldn't
3912 cause an overflow (because we subtract 1), the overflow
3913 is recorded during the conversion to index_type, before
3914 the subtraction. Handling this case seems like an
3915 unnecessary complication. */
3916 if (TREE_OVERFLOW (itype))
3918 error ("size of array `%s' is too large", name);
3919 type = error_mark_node;
3925 /* We must be able to distinguish the
3926 SAVE_EXPR_CONTEXT for the variably-sized type
3927 so that we can set it correctly in
3928 set_save_expr_context. The convention is
3929 that all SAVE_EXPRs that need to be reset
3930 have NULL_TREE for their SAVE_EXPR_CONTEXT. */
3931 tree cfd = current_function_decl;
3932 if (decl_context == PARM)
3933 current_function_decl = NULL_TREE;
3934 itype = variable_size (itype);
3935 if (decl_context == PARM)
3936 current_function_decl = cfd;
3938 itype = build_index_type (itype);
3941 else if (decl_context == FIELD)
3943 if (pedantic && !flag_isoc99 && !in_system_header)
3944 pedwarn ("ISO C90 does not support flexible array members");
3946 /* ISO C99 Flexible array members are effectively identical
3947 to GCC's zero-length array extension. */
3948 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
3951 /* If pedantic, complain about arrays of incomplete types. */
3953 if (pedantic && !COMPLETE_TYPE_P (type))
3954 pedwarn ("array type has incomplete element type");
3956 /* Build the array type itself, then merge any constancy or
3957 volatility into the target type. We must do it in this order
3958 to ensure that the TYPE_MAIN_VARIANT field of the array type
3959 is set correctly. */
3961 type = build_array_type (type, itype);
3963 type = c_build_qualified_type (type, type_quals);
3966 C_TYPE_VARIABLE_SIZE (type) = 1;
3968 /* The GCC extension for zero-length arrays differs from
3969 ISO flexible array members in that sizeof yields zero. */
3970 if (size && integer_zerop (size))
3973 TYPE_SIZE (type) = bitsize_zero_node;
3974 TYPE_SIZE_UNIT (type) = size_zero_node;
3976 if (decl_context != PARM
3977 && (array_ptr_quals != NULL_TREE || array_parm_static))
3979 error ("static or type qualifiers in non-parameter array declarator");
3980 array_ptr_quals = NULL_TREE;
3981 array_parm_static = 0;
3984 else if (TREE_CODE (declarator) == CALL_EXPR)
3986 /* Say it's a definition only for the declarator closest to
3987 the identifier, apart possibly from some attributes. */
3988 bool really_funcdef = false;
3992 tree t = TREE_OPERAND (declarator, 0);
3993 while (TREE_CODE (t) == TREE_LIST)
3995 really_funcdef = (TREE_CODE (t) == IDENTIFIER_NODE);
3998 /* Declaring a function type.
3999 Make sure we have a valid type for the function to return. */
4000 if (type == error_mark_node)
4005 /* Warn about some types functions can't return. */
4007 if (TREE_CODE (type) == FUNCTION_TYPE)
4009 error ("`%s' declared as function returning a function", name);
4010 type = integer_type_node;
4012 if (TREE_CODE (type) == ARRAY_TYPE)
4014 error ("`%s' declared as function returning an array", name);
4015 type = integer_type_node;
4018 /* Construct the function type and go to the next
4019 inner layer of declarator. */
4021 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4023 /* Type qualifiers before the return type of the function
4024 qualify the return type, not the function type. */
4027 /* Type qualifiers on a function return type are normally
4028 permitted by the standard but have no effect, so give a
4029 warning at -Wextra. Qualifiers on a void return type have
4030 meaning as a GNU extension, and are banned on function
4031 definitions in ISO C. FIXME: strictly we shouldn't
4032 pedwarn for qualified void return types except on function
4033 definitions, but not doing so could lead to the undesirable
4034 state of a "volatile void" function return type not being
4035 warned about, and a use of the function being compiled
4036 with GNU semantics, with no diagnostics under -pedantic. */
4037 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4038 pedwarn ("ISO C forbids qualified void function return type");
4039 else if (extra_warnings
4040 && !(VOID_TYPE_P (type)
4041 && type_quals == TYPE_QUAL_VOLATILE))
4042 warning ("type qualifiers ignored on function return type");
4044 type = c_build_qualified_type (type, type_quals);
4046 type_quals = TYPE_UNQUALIFIED;
4048 type = build_function_type (type, arg_types);
4049 declarator = TREE_OPERAND (declarator, 0);
4051 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4052 the formal parameter list of this FUNCTION_TYPE to point to
4053 the FUNCTION_TYPE node itself. */
4058 for (link = last_function_parm_tags;
4060 link = TREE_CHAIN (link))
4061 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4064 else if (TREE_CODE (declarator) == INDIRECT_REF)
4066 /* Merge any constancy or volatility into the target type
4069 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4071 pedwarn ("ISO C forbids qualified function types");
4073 type = c_build_qualified_type (type, type_quals);
4074 type_quals = TYPE_UNQUALIFIED;
4077 type = build_pointer_type (type);
4079 /* Process a list of type modifier keywords
4080 (such as const or volatile) that were given inside the `*'. */
4082 if (TREE_TYPE (declarator))
4090 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4091 typemodlist = TREE_CHAIN (typemodlist))
4093 tree qualifier = TREE_VALUE (typemodlist);
4095 if (C_IS_RESERVED_WORD (qualifier))
4097 if (C_RID_CODE (qualifier) == RID_CONST)
4099 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4101 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4111 error ("invalid type modifier within pointer declarator");
4112 if (pedantic && !flag_isoc99)
4115 pedwarn ("duplicate `const'");
4117 pedwarn ("duplicate `volatile'");
4119 pedwarn ("duplicate `restrict'");
4122 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4123 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4124 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4127 declarator = TREE_OPERAND (declarator, 0);
4134 /* Now TYPE has the actual type. */
4136 /* Did array size calculations overflow? */
4138 if (TREE_CODE (type) == ARRAY_TYPE
4139 && COMPLETE_TYPE_P (type)
4140 && TREE_OVERFLOW (TYPE_SIZE (type)))
4142 error ("size of array `%s' is too large", name);
4143 /* If we proceed with the array type as it is, we'll eventually
4144 crash in tree_low_cst(). */
4145 type = error_mark_node;
4148 /* If this is declaring a typedef name, return a TYPE_DECL. */
4150 if (specbits & (1 << (int) RID_TYPEDEF))
4153 /* Note that the grammar rejects storage classes
4154 in typenames, fields or parameters */
4155 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4157 pedwarn ("ISO C forbids qualified function types");
4159 type = c_build_qualified_type (type, type_quals);
4160 decl = build_decl (TYPE_DECL, declarator, type);
4161 if ((specbits & (1 << (int) RID_SIGNED))
4162 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4163 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4164 decl_attributes (&decl, returned_attrs, 0);
4168 /* Detect the case of an array type of unspecified size
4169 which came, as such, direct from a typedef name.
4170 We must copy the type, so that each identifier gets
4171 a distinct type, so that each identifier's size can be
4172 controlled separately by its own initializer. */
4174 if (type != 0 && typedef_type != 0
4175 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4176 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4178 type = build_array_type (TREE_TYPE (type), 0);
4180 C_TYPE_VARIABLE_SIZE (type) = 1;
4183 /* If this is a type name (such as, in a cast or sizeof),
4184 compute the type and return it now. */
4186 if (decl_context == TYPENAME)
4188 /* Note that the grammar rejects storage classes
4189 in typenames, fields or parameters */
4190 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4192 pedwarn ("ISO C forbids const or volatile function types");
4194 type = c_build_qualified_type (type, type_quals);
4195 decl_attributes (&type, returned_attrs, 0);
4199 /* Aside from typedefs and type names (handle above),
4200 `void' at top level (not within pointer)
4201 is allowed only in public variables.
4202 We don't complain about parms either, but that is because
4203 a better error message can be made later. */
4205 if (VOID_TYPE_P (type) && decl_context != PARM
4206 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4207 && ((specbits & (1 << (int) RID_EXTERN))
4208 || (current_scope == global_scope
4210 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4212 error ("variable or field `%s' declared void", name);
4213 type = integer_type_node;
4216 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4217 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4222 if (decl_context == PARM)
4224 tree type_as_written;
4227 /* A parameter declared as an array of T is really a pointer to T.
4228 One declared as a function is really a pointer to a function. */
4230 if (TREE_CODE (type) == ARRAY_TYPE)
4232 /* Transfer const-ness of array into that of type pointed to. */
4233 type = TREE_TYPE (type);
4235 type = c_build_qualified_type (type, type_quals);
4236 type = build_pointer_type (type);
4237 type_quals = TYPE_UNQUALIFIED;
4238 if (array_ptr_quals)
4240 tree new_ptr_quals, new_ptr_attrs;
4242 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4243 /* We don't yet implement attributes in this context. */
4244 if (new_ptr_attrs != NULL_TREE)
4245 warning ("attributes in parameter array declarator ignored");
4250 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4252 tree qualifier = TREE_VALUE (new_ptr_quals);
4254 if (C_IS_RESERVED_WORD (qualifier))
4256 if (C_RID_CODE (qualifier) == RID_CONST)
4258 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4260 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4270 error ("invalid type modifier within array declarator");
4272 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4273 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4274 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4278 else if (TREE_CODE (type) == FUNCTION_TYPE)
4280 if (pedantic && type_quals)
4281 pedwarn ("ISO C forbids qualified function types");
4283 type = c_build_qualified_type (type, type_quals);
4284 type = build_pointer_type (type);
4285 type_quals = TYPE_UNQUALIFIED;
4287 else if (type_quals)
4288 type = c_build_qualified_type (type, type_quals);
4290 type_as_written = type;
4292 decl = build_decl (PARM_DECL, declarator, type);
4294 C_DECL_VARIABLE_SIZE (decl) = 1;
4296 /* Compute the type actually passed in the parmlist,
4297 for the case where there is no prototype.
4298 (For example, shorts and chars are passed as ints.)
4299 When there is a prototype, this is overridden later. */
4301 if (type == error_mark_node)
4302 promoted_type = type;
4304 promoted_type = c_type_promotes_to (type);
4306 DECL_ARG_TYPE (decl) = promoted_type;
4307 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4309 else if (decl_context == FIELD)
4311 /* Structure field. It may not be a function. */
4313 if (TREE_CODE (type) == FUNCTION_TYPE)
4315 error ("field `%s' declared as a function", name);
4316 type = build_pointer_type (type);
4318 else if (TREE_CODE (type) != ERROR_MARK
4319 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4321 error ("field `%s' has incomplete type", name);
4322 type = error_mark_node;
4324 /* Move type qualifiers down to element of an array. */
4325 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4326 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4328 TYPE_DOMAIN (type));
4329 decl = build_decl (FIELD_DECL, declarator, type);
4330 DECL_NONADDRESSABLE_P (decl) = bitfield;
4333 C_DECL_VARIABLE_SIZE (decl) = 1;
4335 else if (TREE_CODE (type) == FUNCTION_TYPE)
4337 /* Every function declaration is "external"
4338 except for those which are inside a function body
4339 in which `auto' is used.
4340 That is a case not specified by ANSI C,
4341 and we use it for forward declarations for nested functions. */
4342 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4343 || current_scope == global_scope);
4345 if (specbits & (1 << (int) RID_AUTO)
4346 && (pedantic || current_scope == global_scope))
4347 pedwarn ("invalid storage class for function `%s'", name);
4348 if (specbits & (1 << (int) RID_REGISTER))
4349 error ("invalid storage class for function `%s'", name);
4350 if (specbits & (1 << (int) RID_THREAD))
4351 error ("invalid storage class for function `%s'", name);
4352 /* Function declaration not at file scope.
4353 Storage classes other than `extern' are not allowed
4354 and `extern' makes no difference. */
4355 if (current_scope != global_scope
4356 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4358 pedwarn ("invalid storage class for function `%s'", name);
4360 decl = build_decl (FUNCTION_DECL, declarator, type);
4361 decl = build_decl_attribute_variant (decl, decl_attr);
4363 DECL_LANG_SPECIFIC (decl)
4364 = ggc_alloc_cleared (sizeof (struct lang_decl));
4366 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4367 pedwarn ("ISO C forbids qualified function types");
4369 /* GNU C interprets a `volatile void' return type to indicate
4370 that the function does not return. */
4371 if ((type_quals & TYPE_QUAL_VOLATILE)
4372 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4373 warning ("`noreturn' function returns non-void value");
4376 DECL_EXTERNAL (decl) = 1;
4377 /* Record absence of global scope for `static' or `auto'. */
4379 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4382 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4384 /* Record presence of `inline', if it is reasonable. */
4385 if (MAIN_NAME_P (declarator))
4388 warning ("cannot inline function `main'");
4392 /* Record that the function is declared `inline'. */
4393 DECL_DECLARED_INLINE_P (decl) = 1;
4395 /* Do not mark bare declarations as DECL_INLINE. Doing so
4396 in the presence of multiple declarations can result in
4397 the abstract origin pointing between the declarations,
4398 which will confuse dwarf2out. */
4401 DECL_INLINE (decl) = 1;
4402 if (specbits & (1 << (int) RID_EXTERN))
4403 current_extern_inline = 1;
4406 /* If -finline-functions, assume it can be inlined. This does
4407 two things: let the function be deferred until it is actually
4408 needed, and let dwarf2 know that the function is inlinable. */
4409 else if (flag_inline_trees == 2 && initialized)
4410 DECL_INLINE (decl) = 1;
4414 /* It's a variable. */
4415 /* An uninitialized decl with `extern' is a reference. */
4416 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4418 /* Move type qualifiers down to element of an array. */
4419 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4421 int saved_align = TYPE_ALIGN(type);
4422 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4424 TYPE_DOMAIN (type));
4425 TYPE_ALIGN (type) = saved_align;
4427 else if (type_quals)
4428 type = c_build_qualified_type (type, type_quals);
4430 /* It is invalid to create an `extern' declaration for a
4431 variable if there is a global declaration that is
4432 `static' and the global declaration is not visible. */
4433 if (extern_ref && current_scope != global_scope)
4437 global_decl = identifier_global_value (declarator);
4439 && TREE_CODE (global_decl) == VAR_DECL
4440 && lookup_name (declarator) != global_decl
4441 && !TREE_PUBLIC (global_decl))
4442 error ("variable previously declared `static' redeclared "
4446 decl = build_decl (VAR_DECL, declarator, type);
4448 C_DECL_VARIABLE_SIZE (decl) = 1;
4451 pedwarn ("%Jvariable '%D' declared `inline'", decl, decl);
4453 DECL_EXTERNAL (decl) = extern_ref;
4455 /* At file scope, the presence of a `static' or `register' storage
4456 class specifier, or the absence of all storage class specifiers
4457 makes this declaration a definition (perhaps tentative). Also,
4458 the absence of both `static' and `register' makes it public. */
4459 if (current_scope == global_scope)
4461 TREE_PUBLIC (decl) = !(specbits & ((1 << (int) RID_STATIC)
4462 | (1 << (int) RID_REGISTER)));
4463 TREE_STATIC (decl) = !extern_ref;
4465 /* Not at file scope, only `static' makes a static definition. */
4468 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4469 TREE_PUBLIC (decl) = extern_ref;
4472 if (specbits & 1 << (int) RID_THREAD)
4474 if (targetm.have_tls)
4475 DECL_THREAD_LOCAL (decl) = 1;
4477 /* A mere warning is sure to result in improper semantics
4478 at runtime. Don't bother to allow this to compile. */
4479 error ("thread-local storage not supported for this target");
4483 /* Record `register' declaration for warnings on &
4484 and in case doing stupid register allocation. */
4486 if (specbits & (1 << (int) RID_REGISTER))
4487 DECL_REGISTER (decl) = 1;
4489 /* Record constancy and volatility. */
4490 c_apply_type_quals_to_decl (type_quals, decl);
4492 /* If a type has volatile components, it should be stored in memory.
4493 Otherwise, the fact that those components are volatile
4494 will be ignored, and would even crash the compiler. */
4495 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4496 c_mark_addressable (decl);
4498 #ifdef ENABLE_CHECKING
4499 /* This is the earliest point at which we might know the assembler
4500 name of a variable. Thus, if it's known before this, die horribly. */
4501 if (DECL_ASSEMBLER_NAME_SET_P (decl))
4505 decl_attributes (&decl, returned_attrs, 0);
4511 /* Decode the parameter-list info for a function type or function definition.
4512 The argument is the value returned by `get_parm_info' (or made in parse.y
4513 if there is an identifier list instead of a parameter decl list).
4514 These two functions are separate because when a function returns
4515 or receives functions then each is called multiple times but the order
4516 of calls is different. The last call to `grokparms' is always the one
4517 that contains the formal parameter names of a function definition.
4519 Store in `last_function_parms' a chain of the decls of parms.
4520 Also store in `last_function_parm_tags' a chain of the struct, union,
4521 and enum tags declared among the parms.
4523 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4525 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4526 a mere declaration. A nonempty identifier-list gets an error message
4527 when FUNCDEF_FLAG is zero. */
4530 grokparms (tree parms_info, int funcdef_flag)
4532 tree first_parm = TREE_CHAIN (parms_info);
4534 last_function_parms = TREE_PURPOSE (parms_info);
4535 last_function_parm_tags = TREE_VALUE (parms_info);
4536 last_function_parm_others = TREE_TYPE (parms_info);
4538 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4539 && !in_system_header)
4540 warning ("function declaration isn't a prototype");
4543 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4546 pedwarn ("parameter names (without types) in function declaration");
4548 last_function_parms = first_parm;
4555 /* If the arg types are incomplete in a declaration,
4556 they must include undefined tags.
4557 These tags can never be defined in the scope of the declaration,
4558 so the types can never be completed,
4559 and no call can be compiled successfully. */
4561 for (parm = last_function_parms, typelt = first_parm;
4563 parm = TREE_CHAIN (parm))
4564 /* Skip over any enumeration constants declared here. */
4565 if (TREE_CODE (parm) == PARM_DECL)
4567 /* Barf if the parameter itself has an incomplete type. */
4568 tree type = TREE_VALUE (typelt);
4569 if (type == error_mark_node)
4571 if (!COMPLETE_TYPE_P (type))
4573 if (funcdef_flag && DECL_NAME (parm) != 0)
4574 error ("parameter `%s' has incomplete type",
4575 IDENTIFIER_POINTER (DECL_NAME (parm)));
4577 warning ("parameter has incomplete type");
4580 TREE_VALUE (typelt) = error_mark_node;
4581 TREE_TYPE (parm) = error_mark_node;
4584 typelt = TREE_CHAIN (typelt);
4591 /* Return a tree_list node with info on a parameter list just parsed.
4592 The TREE_PURPOSE is a list of decls of those parms.
4593 The TREE_VALUE is a list of structure, union and enum tags defined.
4594 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4595 The TREE_TYPE is a list of non-parameter decls which appeared with the
4597 This tree_list node is later fed to `grokparms'.
4599 VOID_AT_END nonzero means append `void' to the end of the type-list.
4600 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4603 get_parm_info (int void_at_end)
4605 tree decl, type, list;
4607 tree *last_type = &types;
4608 tree tags = current_scope->tags;
4609 tree parms = current_scope->parms;
4610 tree others = current_scope->names;
4611 static bool explained_incomplete_types = false;
4612 bool gave_void_only_once_err = false;
4614 /* Just "void" (and no ellipsis) is special. There are really no parms.
4615 But if the "void" is qualified (by "const" or "volatile"), or has a
4616 storage class specifier ("register"), then the behavior is undefined;
4617 issue an error. Typedefs for "void" are OK (see DR#157). */
4618 if (void_at_end && parms != 0
4619 && TREE_CHAIN (parms) == 0
4620 && VOID_TYPE_P (TREE_TYPE (parms))
4621 && !DECL_NAME (parms))
4623 if (TREE_THIS_VOLATILE (parms)
4624 || TREE_READONLY (parms)
4625 || DECL_REGISTER (parms))
4626 error ("\"void\" as only parameter may not be qualified");
4628 return tree_cons (0, 0, tree_cons (0, void_type_node, 0));
4631 /* Sanity check all of the parameter declarations. */
4632 for (decl = parms; decl; decl = TREE_CHAIN (decl))
4634 if (TREE_CODE (decl) != PARM_DECL)
4636 if (TREE_ASM_WRITTEN (decl))
4639 /* Since there is a prototype, args are passed in their
4640 declared types. The back end may override this. */
4641 type = TREE_TYPE (decl);
4642 DECL_ARG_TYPE (decl) = type;
4644 /* Check for (..., void, ...) and issue an error. */
4645 if (VOID_TYPE_P (type) && !DECL_NAME (decl) && !gave_void_only_once_err)
4647 error ("\"void\" must be the only parameter");
4648 gave_void_only_once_err = true;
4651 type = build_tree_list (0, type);
4653 last_type = &TREE_CHAIN (type);
4656 /* Check the list of non-parameter decls for any forward parm decls
4657 that never got real decls. */
4658 for (decl = others; decl; decl = TREE_CHAIN (decl))
4659 if (TREE_CODE (decl) == PARM_DECL)
4661 if (!TREE_ASM_WRITTEN (decl))
4664 error ("%Jparameter \"%D\" has just a forward declaration",
4668 /* Warn about any struct, union or enum tags defined within this
4669 list. The scope of such types is limited to this declaration,
4670 which is rarely if ever desirable (it's impossible to call such
4671 a function with type-correct arguments). */
4672 for (decl = tags; decl; decl = TREE_CHAIN (decl))
4674 enum tree_code code = TREE_CODE (TREE_VALUE (decl));
4675 const char *keyword;
4676 /* An anonymous union parm type is meaningful as a GNU extension.
4677 So don't warn for that. */
4678 if (code == UNION_TYPE && TREE_PURPOSE (decl) == 0 && !pedantic)
4681 /* The keyword should not be translated. */
4684 case RECORD_TYPE: keyword = "struct"; break;
4685 case UNION_TYPE: keyword = "union"; break;
4686 case ENUMERAL_TYPE: keyword = "enum"; break;
4690 if (TREE_PURPOSE (decl))
4691 /* The first %s will be one of 'struct', 'union', or 'enum'. */
4692 warning ("\"%s %s\" declared inside parameter list",
4693 keyword, IDENTIFIER_POINTER (TREE_PURPOSE (decl)));
4695 /* The %s will be one of 'struct', 'union', or 'enum'. */
4696 warning ("anonymous %s declared inside parameter list", keyword);
4698 if (! explained_incomplete_types)
4700 warning ("its scope is only this definition or declaration,"
4701 " which is probably not what you want");
4702 explained_incomplete_types = true;
4709 type = build_tree_list (0, void_type_node);
4713 list = tree_cons (parms, tags, types);
4714 TREE_TYPE (list) = others;
4718 /* Get the struct, enum or union (CODE says which) with tag NAME.
4719 Define the tag as a forward-reference if it is not defined. */
4722 xref_tag (enum tree_code code, tree name)
4724 /* If a cross reference is requested, look up the type
4725 already defined for this tag and return it. */
4727 tree ref = lookup_tag (code, name, 0);
4728 /* If this is the right type of tag, return what we found.
4729 (This reference will be shadowed by shadow_tag later if appropriate.)
4730 If this is the wrong type of tag, do not return it. If it was the
4731 wrong type in the same scope, we will have had an error
4732 message already; if in a different scope and declaring
4733 a name, pending_xref_error will give an error message; but if in a
4734 different scope and not declaring a name, this tag should
4735 shadow the previous declaration of a different type of tag, and
4736 this would not work properly if we return the reference found.
4737 (For example, with "struct foo" in an outer scope, "union foo;"
4738 must shadow that tag with a new one of union type.) */
4739 if (ref && TREE_CODE (ref) == code)
4742 /* If no such tag is yet defined, create a forward-reference node
4743 and record it as the "definition".
4744 When a real declaration of this type is found,
4745 the forward-reference will be altered into a real type. */
4747 ref = make_node (code);
4748 if (code == ENUMERAL_TYPE)
4750 /* Give the type a default layout like unsigned int
4751 to avoid crashing if it does not get defined. */
4752 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
4753 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
4754 TYPE_USER_ALIGN (ref) = 0;
4755 TREE_UNSIGNED (ref) = 1;
4756 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
4757 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
4758 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
4761 pushtag (name, ref);
4766 /* Make sure that the tag NAME is defined *in the current scope*
4767 at least as a forward reference.
4768 CODE says which kind of tag NAME ought to be. */
4771 start_struct (enum tree_code code, tree name)
4773 /* If there is already a tag defined at this scope
4774 (as a forward reference), just return it. */
4779 ref = lookup_tag (code, name, 1);
4780 if (ref && TREE_CODE (ref) == code)
4782 if (TYPE_FIELDS (ref))
4784 if (code == UNION_TYPE)
4785 error ("redefinition of `union %s'", IDENTIFIER_POINTER (name));
4787 error ("redefinition of `struct %s'", IDENTIFIER_POINTER (name));
4792 /* Otherwise create a forward-reference just so the tag is in scope. */
4794 ref = make_node (code);
4795 pushtag (name, ref);
4798 C_TYPE_BEING_DEFINED (ref) = 1;
4799 TYPE_PACKED (ref) = flag_pack_struct;
4803 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
4804 of a structure component, returning a FIELD_DECL node.
4805 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
4807 This is done during the parsing of the struct declaration.
4808 The FIELD_DECL nodes are chained together and the lot of them
4809 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
4812 grokfield (tree declarator, tree declspecs, tree width)
4816 if (declarator == NULL_TREE && width == NULL_TREE)
4818 /* This is an unnamed decl.
4820 If we have something of the form "union { list } ;" then this
4821 is the anonymous union extension. Similarly for struct.
4823 If this is something of the form "struct foo;", then
4824 If MS extensions are enabled, this is handled as an
4826 Otherwise this is a forward declaration of a structure tag.
4828 If this is something of the form "foo;" and foo is a TYPE_DECL, then
4829 If MS extensions are enabled and foo names a structure, then
4830 again this is an anonymous struct.
4831 Otherwise this is an error.
4833 Oh what a horrid tangled web we weave. I wonder if MS consciously
4834 took this from Plan 9 or if it was an accident of implementation
4835 that took root before someone noticed the bug... */
4837 tree type = TREE_VALUE (declspecs);
4839 if (flag_ms_extensions && TREE_CODE (type) == TYPE_DECL)
4840 type = TREE_TYPE (type);
4841 if (TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE)
4843 if (flag_ms_extensions)
4846 goto warn_unnamed_field;
4847 else if (TYPE_NAME (type) == NULL)
4850 goto warn_unnamed_field;
4855 warning ("declaration does not declare anything");
4860 value = grokdeclarator (declarator, declspecs, FIELD, 0,
4861 width ? &width : NULL);
4863 finish_decl (value, NULL_TREE, NULL_TREE);
4864 DECL_INITIAL (value) = width;
4869 /* Generate an error for any duplicate field names in FIELDLIST. Munge
4870 the list such that this does not present a problem later. */
4873 detect_field_duplicates (tree fieldlist)
4878 /* First, see if there are more than "a few" fields.
4879 This is trivially true if there are zero or one fields. */
4882 x = TREE_CHAIN (fieldlist);
4888 } while (timeout > 0 && x);
4890 /* If there were "few" fields, avoid the overhead of allocating
4891 a hash table. Instead just do the nested traversal thing. */
4894 for (x = TREE_CHAIN (fieldlist); x ; x = TREE_CHAIN (x))
4897 for (y = fieldlist; y != x; y = TREE_CHAIN (y))
4898 if (DECL_NAME (y) == DECL_NAME (x))
4900 error ("%Jduplicate member '%D'", x, x);
4901 DECL_NAME (x) = NULL_TREE;
4907 htab_t htab = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
4910 for (x = fieldlist; x ; x = TREE_CHAIN (x))
4911 if ((y = DECL_NAME (x)) != 0)
4913 slot = htab_find_slot (htab, y, INSERT);
4916 error ("%Jduplicate member '%D'", x, x);
4917 DECL_NAME (x) = NULL_TREE;
4926 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
4927 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
4928 ATTRIBUTES are attributes to be applied to the structure. */
4931 finish_struct (tree t, tree fieldlist, tree attributes)
4934 int toplevel = global_scope == current_scope;
4935 int saw_named_field;
4937 /* If this type was previously laid out as a forward reference,
4938 make sure we lay it out again. */
4942 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
4944 /* Nameless union parm types are useful as GCC extension. */
4945 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
4946 /* Otherwise, warn about any struct or union def. in parmlist. */
4947 if (in_parm_level_p ())
4950 pedwarn ("%s defined inside parms",
4951 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
4953 warning ("%s defined inside parms",
4954 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
4959 for (x = fieldlist; x; x = TREE_CHAIN (x))
4960 if (DECL_NAME (x) != 0)
4964 pedwarn ("%s has no %s",
4965 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
4966 fieldlist ? _("named members") : _("members"));
4969 /* Install struct as DECL_CONTEXT of each field decl.
4970 Also process specified field sizes,m which is found in the DECL_INITIAL.
4971 Store 0 there, except for ": 0" fields (so we can find them
4972 and delete them, below). */
4974 saw_named_field = 0;
4975 for (x = fieldlist; x; x = TREE_CHAIN (x))
4977 DECL_CONTEXT (x) = t;
4978 DECL_PACKED (x) |= TYPE_PACKED (t);
4980 /* If any field is const, the structure type is pseudo-const. */
4981 if (TREE_READONLY (x))
4982 C_TYPE_FIELDS_READONLY (t) = 1;
4985 /* A field that is pseudo-const makes the structure likewise. */
4986 tree t1 = TREE_TYPE (x);
4987 while (TREE_CODE (t1) == ARRAY_TYPE)
4988 t1 = TREE_TYPE (t1);
4989 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
4990 && C_TYPE_FIELDS_READONLY (t1))
4991 C_TYPE_FIELDS_READONLY (t) = 1;
4994 /* Any field that is volatile means variables of this type must be
4995 treated in some ways as volatile. */
4996 if (TREE_THIS_VOLATILE (x))
4997 C_TYPE_FIELDS_VOLATILE (t) = 1;
4999 /* Any field of nominal variable size implies structure is too. */
5000 if (C_DECL_VARIABLE_SIZE (x))
5001 C_TYPE_VARIABLE_SIZE (t) = 1;
5003 /* Detect invalid nested redefinition. */
5004 if (TREE_TYPE (x) == t)
5005 error ("nested redefinition of `%s'",
5006 IDENTIFIER_POINTER (TYPE_NAME (t)));
5008 if (DECL_INITIAL (x))
5010 unsigned HOST_WIDE_INT width = tree_low_cst (DECL_INITIAL (x), 1);
5011 DECL_SIZE (x) = bitsize_int (width);
5012 DECL_BIT_FIELD (x) = 1;
5013 SET_DECL_C_BIT_FIELD (x);
5016 DECL_INITIAL (x) = 0;
5018 /* Detect flexible array member in an invalid context. */
5019 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5020 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5021 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5022 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5024 if (TREE_CODE (t) == UNION_TYPE)
5026 error ("%Jflexible array member in union", x);
5027 TREE_TYPE (x) = error_mark_node;
5029 else if (TREE_CHAIN (x) != NULL_TREE)
5031 error ("%Jflexible array member not at end of struct", x);
5032 TREE_TYPE (x) = error_mark_node;
5034 else if (! saw_named_field)
5036 error ("%Jflexible array member in otherwise empty struct", x);
5037 TREE_TYPE (x) = error_mark_node;
5041 if (pedantic && !in_system_header && TREE_CODE (t) == RECORD_TYPE
5042 && flexible_array_type_p (TREE_TYPE (x)))
5043 pedwarn ("%Jinvalid use of structure with flexible array member", x);
5046 saw_named_field = 1;
5049 detect_field_duplicates (fieldlist);
5051 /* Now we have the nearly final fieldlist. Record it,
5052 then lay out the structure or union (including the fields). */
5054 TYPE_FIELDS (t) = fieldlist;
5058 /* Delete all zero-width bit-fields from the fieldlist. */
5060 tree *fieldlistp = &fieldlist;
5062 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5063 *fieldlistp = TREE_CHAIN (*fieldlistp);
5065 fieldlistp = &TREE_CHAIN (*fieldlistp);
5068 /* Now we have the truly final field list.
5069 Store it in this type and in the variants. */
5071 TYPE_FIELDS (t) = fieldlist;
5073 /* If there are lots of fields, sort so we can look through them fast.
5074 We arbitrarily consider 16 or more elts to be "a lot". */
5079 for (x = fieldlist; x; x = TREE_CHAIN (x))
5081 if (len > 15 || DECL_NAME (x) == NULL)
5089 struct lang_type *space;
5090 struct sorted_fields_type *space2;
5092 len += list_length (x);
5094 /* Use the same allocation policy here that make_node uses, to
5095 ensure that this lives as long as the rest of the struct decl.
5096 All decls in an inline function need to be saved. */
5098 space = ggc_alloc (sizeof (struct lang_type));
5099 space2 = ggc_alloc (sizeof (struct sorted_fields_type) + len * sizeof (tree));
5103 field_array = &space2->elts[0];
5104 for (x = fieldlist; x; x = TREE_CHAIN (x))
5106 field_array[len++] = x;
5108 /* If there is anonymous struct or union, break out of the loop. */
5109 if (DECL_NAME (x) == NULL)
5112 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5115 TYPE_LANG_SPECIFIC (t) = space;
5116 TYPE_LANG_SPECIFIC (t)->s->len = len;
5117 field_array = TYPE_LANG_SPECIFIC (t)->s->elts;
5118 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5123 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5125 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5126 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5127 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5128 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5131 /* If this was supposed to be a transparent union, but we can't
5132 make it one, warn and turn off the flag. */
5133 if (TREE_CODE (t) == UNION_TYPE
5134 && TYPE_TRANSPARENT_UNION (t)
5135 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5137 TYPE_TRANSPARENT_UNION (t) = 0;
5138 warning ("union cannot be made transparent");
5141 /* If this structure or union completes the type of any previous
5142 variable declaration, lay it out and output its rtl. */
5143 for (x = C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t));
5147 tree decl = TREE_VALUE (x);
5148 if (TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5149 layout_array_type (TREE_TYPE (decl));
5150 if (TREE_CODE (decl) != TYPE_DECL)
5152 layout_decl (decl, 0);
5153 if (c_dialect_objc ())
5154 objc_check_decl (decl);
5155 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5160 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t)) = 0;
5162 /* Finish debugging output for this type. */
5163 rest_of_type_compilation (t, toplevel);
5168 /* Lay out the type T, and its element type, and so on. */
5171 layout_array_type (tree t)
5173 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5174 layout_array_type (TREE_TYPE (t));
5178 /* Begin compiling the definition of an enumeration type.
5179 NAME is its name (or null if anonymous).
5180 Returns the type object, as yet incomplete.
5181 Also records info about it so that build_enumerator
5182 may be used to declare the individual values as they are read. */
5185 start_enum (tree name)
5189 /* If this is the real definition for a previous forward reference,
5190 fill in the contents in the same object that used to be the
5191 forward reference. */
5194 enumtype = lookup_tag (ENUMERAL_TYPE, name, 1);
5196 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5198 enumtype = make_node (ENUMERAL_TYPE);
5199 pushtag (name, enumtype);
5202 C_TYPE_BEING_DEFINED (enumtype) = 1;
5204 if (TYPE_VALUES (enumtype) != 0)
5206 /* This enum is a named one that has been declared already. */
5207 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5209 /* Completely replace its old definition.
5210 The old enumerators remain defined, however. */
5211 TYPE_VALUES (enumtype) = 0;
5214 enum_next_value = integer_zero_node;
5217 if (flag_short_enums)
5218 TYPE_PACKED (enumtype) = 1;
5223 /* After processing and defining all the values of an enumeration type,
5224 install their decls in the enumeration type and finish it off.
5225 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5226 and ATTRIBUTES are the specified attributes.
5227 Returns ENUMTYPE. */
5230 finish_enum (tree enumtype, tree values, tree attributes)
5233 tree minnode = 0, maxnode = 0, enum_value_type;
5234 int precision, unsign;
5235 int toplevel = (global_scope == current_scope);
5237 if (in_parm_level_p ())
5238 warning ("enum defined inside parms");
5240 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5242 /* Calculate the maximum value of any enumerator in this type. */
5244 if (values == error_mark_node)
5245 minnode = maxnode = integer_zero_node;
5248 minnode = maxnode = TREE_VALUE (values);
5249 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5251 tree value = TREE_VALUE (pair);
5252 if (tree_int_cst_lt (maxnode, value))
5254 if (tree_int_cst_lt (value, minnode))
5259 /* Construct the final type of this enumeration. It is the same
5260 as one of the integral types - the narrowest one that fits, except
5261 that normally we only go as narrow as int - and signed iff any of
5262 the values are negative. */
5263 unsign = (tree_int_cst_sgn (minnode) >= 0);
5264 precision = MAX (min_precision (minnode, unsign),
5265 min_precision (maxnode, unsign));
5266 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5268 tree narrowest = c_common_type_for_size (precision, unsign);
5271 warning ("enumeration values exceed range of largest integer");
5272 narrowest = long_long_integer_type_node;
5275 precision = TYPE_PRECISION (narrowest);
5278 precision = TYPE_PRECISION (integer_type_node);
5280 if (precision == TYPE_PRECISION (integer_type_node))
5281 enum_value_type = c_common_type_for_size (precision, 0);
5283 enum_value_type = enumtype;
5285 TYPE_MIN_VALUE (enumtype) = minnode;
5286 TYPE_MAX_VALUE (enumtype) = maxnode;
5287 TYPE_PRECISION (enumtype) = precision;
5288 TREE_UNSIGNED (enumtype) = unsign;
5289 TYPE_SIZE (enumtype) = 0;
5290 layout_type (enumtype);
5292 if (values != error_mark_node)
5294 /* Change the type of the enumerators to be the enum type. We
5295 need to do this irrespective of the size of the enum, for
5296 proper type checking. Replace the DECL_INITIALs of the
5297 enumerators, and the value slots of the list, with copies
5298 that have the enum type; they cannot be modified in place
5299 because they may be shared (e.g. integer_zero_node) Finally,
5300 change the purpose slots to point to the names of the decls. */
5301 for (pair = values; pair; pair = TREE_CHAIN (pair))
5303 tree enu = TREE_PURPOSE (pair);
5305 TREE_TYPE (enu) = enumtype;
5307 /* The ISO C Standard mandates enumerators to have type int,
5308 even though the underlying type of an enum type is
5309 unspecified. Here we convert any enumerators that fit in
5310 an int to type int, to avoid promotions to unsigned types
5311 when comparing integers with enumerators that fit in the
5312 int range. When -pedantic is given, build_enumerator()
5313 would have already taken care of those that don't fit. */
5314 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5315 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5317 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5319 TREE_PURPOSE (pair) = DECL_NAME (enu);
5320 TREE_VALUE (pair) = DECL_INITIAL (enu);
5323 TYPE_VALUES (enumtype) = values;
5326 /* Fix up all variant types of this enum type. */
5327 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5329 if (tem == enumtype)
5331 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5332 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5333 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5334 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5335 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5336 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5337 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5338 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5339 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5340 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5343 /* Finish debugging output for this type. */
5344 rest_of_type_compilation (enumtype, toplevel);
5349 /* Build and install a CONST_DECL for one value of the
5350 current enumeration type (one that was begun with start_enum).
5351 Return a tree-list containing the CONST_DECL and its value.
5352 Assignment of sequential values by default is handled here. */
5355 build_enumerator (tree name, tree value)
5359 /* Validate and default VALUE. */
5361 /* Remove no-op casts from the value. */
5363 STRIP_TYPE_NOPS (value);
5367 if (TREE_CODE (value) == INTEGER_CST)
5369 value = default_conversion (value);
5370 constant_expression_warning (value);
5374 error ("enumerator value for `%s' not integer constant",
5375 IDENTIFIER_POINTER (name));
5380 /* Default based on previous value. */
5381 /* It should no longer be possible to have NON_LVALUE_EXPR
5385 value = enum_next_value;
5387 error ("overflow in enumeration values");
5390 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5392 pedwarn ("ISO C restricts enumerator values to range of `int'");
5393 value = convert (integer_type_node, value);
5396 /* Set basis for default for next value. */
5397 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5398 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5400 /* Now create a declaration for the enum value name. */
5402 type = TREE_TYPE (value);
5403 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5404 TYPE_PRECISION (integer_type_node)),
5405 (TYPE_PRECISION (type)
5406 >= TYPE_PRECISION (integer_type_node)
5407 && TREE_UNSIGNED (type)));
5409 decl = build_decl (CONST_DECL, name, type);
5410 DECL_INITIAL (decl) = convert (type, value);
5413 return tree_cons (decl, value, NULL_TREE);
5417 /* Create the FUNCTION_DECL for a function definition.
5418 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5419 the declaration; they describe the function's name and the type it returns,
5420 but twisted together in a fashion that parallels the syntax of C.
5422 This function creates a binding context for the function body
5423 as well as setting up the FUNCTION_DECL in current_function_decl.
5425 Returns 1 on success. If the DECLARATOR is not suitable for a function
5426 (it defines a datum instead), we return 0, which tells
5427 yyparse to report a parse error. */
5430 start_function (tree declspecs, tree declarator, tree attributes)
5432 tree decl1, old_decl;
5434 int old_immediate_size_expand = immediate_size_expand;
5436 current_function_returns_value = 0; /* Assume, until we see it does. */
5437 current_function_returns_null = 0;
5438 current_function_returns_abnormally = 0;
5439 warn_about_return_type = 0;
5440 current_extern_inline = 0;
5441 c_in_iteration_stmt = 0;
5444 /* Don't expand any sizes in the return type of the function. */
5445 immediate_size_expand = 0;
5447 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1, NULL);
5449 /* If the declarator is not suitable for a function definition,
5450 cause a syntax error. */
5453 immediate_size_expand = old_immediate_size_expand;
5457 decl_attributes (&decl1, attributes, 0);
5459 if (DECL_DECLARED_INLINE_P (decl1)
5460 && DECL_UNINLINABLE (decl1)
5461 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5462 warning ("%Jinline function '%D' given attribute noinline", decl1, decl1);
5464 announce_function (decl1);
5466 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5468 error ("return type is an incomplete type");
5469 /* Make it return void instead. */
5471 = build_function_type (void_type_node,
5472 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5475 if (warn_about_return_type)
5476 pedwarn_c99 ("return type defaults to `int'");
5478 /* Save the parm names or decls from this function's declarator
5479 where store_parm_decls will find them. */
5480 current_function_parms = last_function_parms;
5481 current_function_parm_tags = last_function_parm_tags;
5482 current_function_parm_others = last_function_parm_others;
5484 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5485 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5486 DECL_INITIAL (decl1) = error_mark_node;
5488 /* If this definition isn't a prototype and we had a prototype declaration
5489 before, copy the arg type info from that prototype.
5490 But not if what we had before was a builtin function. */
5491 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5492 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5493 && !DECL_BUILT_IN (old_decl)
5494 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5495 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5496 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5498 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5499 current_function_prototype_locus = DECL_SOURCE_LOCATION (old_decl);
5502 /* Optionally warn of old-fashioned def with no previous prototype. */
5503 if (warn_strict_prototypes
5504 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5505 && C_DECL_ISNT_PROTOTYPE (old_decl))
5506 warning ("function declaration isn't a prototype");
5507 /* Optionally warn of any global def with no previous prototype. */
5508 else if (warn_missing_prototypes
5509 && TREE_PUBLIC (decl1)
5510 && ! MAIN_NAME_P (DECL_NAME (decl1))
5511 && C_DECL_ISNT_PROTOTYPE (old_decl))
5512 warning ("%Jno previous prototype for '%D'", decl1, decl1);
5513 /* Optionally warn of any def with no previous prototype
5514 if the function has already been used. */
5515 else if (warn_missing_prototypes
5516 && old_decl != 0 && TREE_USED (old_decl)
5517 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5518 warning ("%J'%D' was used with no prototype before its definition",
5520 /* Optionally warn of any global def with no previous declaration. */
5521 else if (warn_missing_declarations
5522 && TREE_PUBLIC (decl1)
5524 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5525 warning ("%Jno previous declaration for '%D'", decl1, decl1);
5526 /* Optionally warn of any def with no previous declaration
5527 if the function has already been used. */
5528 else if (warn_missing_declarations
5529 && old_decl != 0 && TREE_USED (old_decl)
5530 && C_DECL_IMPLICIT (old_decl))
5531 warning ("%J`%D' was used with no declaration before its definition",
5534 /* This is a definition, not a reference.
5535 So normally clear DECL_EXTERNAL.
5536 However, `extern inline' acts like a declaration
5537 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5538 DECL_EXTERNAL (decl1) = current_extern_inline;
5540 /* This function exists in static storage.
5541 (This does not mean `static' in the C sense!) */
5542 TREE_STATIC (decl1) = 1;
5544 /* A nested function is not global. */
5545 if (current_function_decl != 0)
5546 TREE_PUBLIC (decl1) = 0;
5548 #ifdef ENABLE_CHECKING
5549 /* This is the earliest point at which we might know the assembler
5550 name of the function. Thus, if it's set before this, die horribly. */
5551 if (DECL_ASSEMBLER_NAME_SET_P (decl1))
5555 /* If #pragma weak was used, mark the decl weak now. */
5556 if (current_scope == global_scope)
5557 maybe_apply_pragma_weak (decl1);
5559 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5560 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5565 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5566 != integer_type_node)
5567 pedwarn ("%Jreturn type of '%D' is not `int'", decl1, decl1);
5569 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5570 args = TREE_CHAIN (args))
5572 tree type = args ? TREE_VALUE (args) : 0;
5574 if (type == void_type_node)
5581 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5582 pedwarn ("%Jfirst argument of '%D' should be `int'",
5587 if (TREE_CODE (type) != POINTER_TYPE
5588 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5589 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5591 pedwarn ("%Jsecond argument of '%D' should be 'char **'",
5596 if (TREE_CODE (type) != POINTER_TYPE
5597 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5598 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5600 pedwarn ("%Jthird argument of '%D' should probably be "
5601 "'char **'", decl1, decl1);
5606 /* It is intentional that this message does not mention the third
5607 argument because it's only mentioned in an appendix of the
5609 if (argct > 0 && (argct < 2 || argct > 3))
5610 pedwarn ("%J'%D' takes only zero or two arguments", decl1, decl1);
5612 if (! TREE_PUBLIC (decl1))
5613 pedwarn ("%J'%D' is normally a non-static function", decl1, decl1);
5616 /* Record the decl so that the function name is defined.
5617 If we already have a decl for this name, and it is a FUNCTION_DECL,
5618 use the old decl. */
5620 current_function_decl = pushdecl (decl1);
5623 declare_parm_level ();
5625 make_decl_rtl (current_function_decl, NULL);
5627 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5628 /* Promote the value to int before returning it. */
5629 if (c_promoting_integer_type_p (restype))
5631 /* It retains unsignedness if not really getting wider. */
5632 if (TREE_UNSIGNED (restype)
5633 && (TYPE_PRECISION (restype)
5634 == TYPE_PRECISION (integer_type_node)))
5635 restype = unsigned_type_node;
5637 restype = integer_type_node;
5639 DECL_RESULT (current_function_decl)
5640 = build_decl (RESULT_DECL, NULL_TREE, restype);
5642 /* If this fcn was already referenced via a block-scope `extern' decl
5643 (or an implicit decl), propagate certain information about the usage. */
5644 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
5645 TREE_ADDRESSABLE (current_function_decl) = 1;
5647 immediate_size_expand = old_immediate_size_expand;
5649 start_fname_decls ();
5654 /* Subroutine of store_parm_decls which handles new-style function
5655 definitions (prototype format). The parms already have decls, so we
5656 need only record them as in effect and complain if any redundant
5657 old-style parm decls were written. */
5659 store_parm_decls_newstyle (void)
5662 tree fndecl = current_function_decl;
5663 tree parms = current_function_parms;
5664 tree tags = current_function_parm_tags;
5665 tree others = current_function_parm_others;
5667 if (current_scope->parms || current_scope->names || current_scope->tags)
5669 error ("%Jold-style parameter declarations in prototyped "
5670 "function definition", fndecl);
5672 /* Get rid of the old-style declarations. */
5677 /* Now make all the parameter declarations visible in the function body.
5678 We can bypass most of the grunt work of pushdecl. */
5679 for (last = 0, decl = parms; decl; last = decl, decl = TREE_CHAIN (decl))
5681 DECL_CONTEXT (decl) = current_function_decl;
5682 if (DECL_NAME (decl) == 0)
5683 error ("%Jparameter name omitted", decl);
5686 if (IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)))
5687 current_scope->shadowed
5688 = tree_cons (DECL_NAME (decl),
5689 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)),
5690 current_scope->shadowed);
5691 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)) = decl;
5694 current_scope->parms = parms;
5695 current_scope->parms_last = last;
5697 /* Record the parameter list in the function declaration. */
5698 DECL_ARGUMENTS (fndecl) = parms;
5700 /* Now make all the ancillary declarations visible, likewise. */
5701 for (last = 0, decl = others; decl; last = decl, decl = TREE_CHAIN (decl))
5703 DECL_CONTEXT (decl) = current_function_decl;
5704 if (DECL_NAME (decl)
5705 && TYPE_MAIN_VARIANT (TREE_TYPE (decl)) != void_type_node)
5707 if (IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)))
5708 current_scope->shadowed
5709 = tree_cons (DECL_NAME (decl),
5710 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)),
5711 current_scope->shadowed);
5712 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl)) = decl;
5715 current_scope->names = others;
5716 current_scope->names_last = last;
5718 /* And all the tag declarations. */
5719 for (decl = tags; decl; decl = TREE_CHAIN (decl))
5720 if (TREE_PURPOSE (decl))
5722 if (IDENTIFIER_TAG_VALUE (TREE_PURPOSE (decl)))
5723 current_scope->shadowed_tags
5724 = tree_cons (TREE_PURPOSE (decl),
5725 IDENTIFIER_SYMBOL_VALUE (TREE_PURPOSE (decl)),
5726 current_scope->shadowed_tags);
5727 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (decl)) = TREE_VALUE (decl);
5729 current_scope->tags = tags;
5732 /* Subroutine of store_parm_decls which handles old-style function
5733 definitions (separate parameter list and declarations). */
5736 store_parm_decls_oldstyle (void)
5738 tree parm, decl, last;
5739 tree fndecl = current_function_decl;
5741 /* This is the identifier list from the function declarator. */
5742 tree parmids = current_function_parms;
5744 /* We use DECL_WEAK as a flag to show which parameters have been
5745 seen already, since it is not used on PARM_DECL. */
5746 #ifdef ENABLE_CHECKING
5747 for (parm = current_scope->parms; parm; parm = TREE_CHAIN (parm))
5748 if (DECL_WEAK (parm))
5752 /* Match each formal parameter name with its declaration. Save each
5753 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
5754 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
5756 if (TREE_VALUE (parm) == 0)
5758 error ("%Jparameter name missing from parameter list", fndecl);
5759 TREE_PURPOSE (parm) = 0;
5763 decl = IDENTIFIER_SYMBOL_VALUE (TREE_VALUE (parm));
5764 if (decl && DECL_CONTEXT (decl) == fndecl)
5766 /* If we got something other than a PARM_DECL it is an error. */
5767 if (TREE_CODE (decl) != PARM_DECL)
5768 error ("%J\"%D\" declared as a non-parameter", decl, decl);
5769 /* If the declaration is already marked, we have a duplicate
5770 name. Complain and ignore the duplicate. */
5771 else if (DECL_WEAK (decl))
5773 error ("%Jmultiple parameters named \"%D\"", decl, decl);
5774 TREE_PURPOSE (parm) = 0;
5777 /* If the declaration says "void", complain and turn it into
5779 else if (VOID_TYPE_P (TREE_TYPE (decl)))
5781 error ("%Jparameter \"%D\" declared void", decl, decl);
5782 TREE_TYPE (decl) = integer_type_node;
5783 DECL_ARG_TYPE (decl) = integer_type_node;
5784 layout_decl (decl, 0);
5787 /* If no declaration found, default to int. */
5790 decl = build_decl (PARM_DECL, TREE_VALUE (parm), integer_type_node);
5791 DECL_ARG_TYPE (decl) = TREE_TYPE (decl);
5792 DECL_SOURCE_LOCATION (decl) = DECL_SOURCE_LOCATION (fndecl);
5796 pedwarn ("%Jtype of \"%D\" defaults to \"int\"", decl, decl);
5797 else if (extra_warnings)
5798 warning ("%Jtype of \"%D\" defaults to \"int\"", decl, decl);
5801 TREE_PURPOSE (parm) = decl;
5802 DECL_WEAK (decl) = 1;
5805 /* Now examine the parms chain for incomplete declarations
5806 and declarations with no corresponding names. */
5808 for (parm = current_scope->parms; parm; parm = TREE_CHAIN (parm))
5810 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
5812 error ("%Jparameter \"%D\" has incomplete type", parm, parm);
5813 TREE_TYPE (parm) = error_mark_node;
5816 if (! DECL_WEAK (parm))
5818 error ("%Jdeclaration for parameter \"%D\" but no such parameter",
5821 /* Pretend the parameter was not missing.
5822 This gets us to a standard state and minimizes
5823 further error messages. */
5824 parmids = chainon (parmids, tree_cons (parm, 0, 0));
5828 /* Chain the declarations together in the order of the list of
5829 names. Store that chain in the function decl, replacing the
5830 list of names. Update the current scope to match. */
5831 DECL_ARGUMENTS (fndecl) = 0;
5833 for (parm = parmids; parm; parm = TREE_CHAIN (parm))
5834 if (TREE_PURPOSE (parm))
5836 if (parm && TREE_PURPOSE (parm))
5838 last = TREE_PURPOSE (parm);
5839 DECL_ARGUMENTS (fndecl) = last;
5840 current_scope->parms = last;
5841 DECL_WEAK (last) = 0;
5843 for (parm = TREE_CHAIN (parm); parm; parm = TREE_CHAIN (parm))
5844 if (TREE_PURPOSE (parm))
5846 TREE_CHAIN (last) = TREE_PURPOSE (parm);
5847 last = TREE_PURPOSE (parm);
5848 DECL_WEAK (last) = 0;
5850 current_scope->parms_last = last;
5851 TREE_CHAIN (last) = 0;
5854 /* If there was a previous prototype,
5855 set the DECL_ARG_TYPE of each argument according to
5856 the type previously specified, and report any mismatches. */
5858 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
5861 for (parm = DECL_ARGUMENTS (fndecl),
5862 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
5863 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
5864 != void_type_node));
5865 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
5867 if (parm == 0 || type == 0
5868 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
5870 error ("number of arguments doesn't match prototype");
5871 error ("%Hprototype declaration",
5872 ¤t_function_prototype_locus);
5875 /* Type for passing arg must be consistent with that
5876 declared for the arg. ISO C says we take the unqualified
5877 type for parameters declared with qualified type. */
5878 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
5879 TYPE_MAIN_VARIANT (TREE_VALUE (type)),
5882 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
5883 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
5885 /* Adjust argument to match prototype. E.g. a previous
5886 `int foo(float);' prototype causes
5887 `int foo(x) float x; {...}' to be treated like
5888 `int foo(float x) {...}'. This is particularly
5889 useful for argument types like uid_t. */
5890 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
5892 if (targetm.calls.promote_prototypes (TREE_TYPE (current_function_decl))
5893 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
5894 && TYPE_PRECISION (TREE_TYPE (parm))
5895 < TYPE_PRECISION (integer_type_node))
5896 DECL_ARG_TYPE (parm) = integer_type_node;
5900 pedwarn ("promoted argument \"%D\" "
5901 "doesn't match prototype", parm);
5902 pedwarn ("%Hprototype declaration",
5903 ¤t_function_prototype_locus);
5908 error ("argument \"%D\" doesn't match prototype", parm);
5909 error ("%Hprototype declaration",
5910 ¤t_function_prototype_locus);
5914 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
5917 /* Otherwise, create a prototype that would match. */
5921 tree actual = 0, last = 0, type;
5923 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
5925 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
5927 TREE_CHAIN (last) = type;
5932 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
5934 TREE_CHAIN (last) = type;
5938 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
5939 of the type of this function, but we need to avoid having this
5940 affect the types of other similarly-typed functions, so we must
5941 first force the generation of an identical (but separate) type
5942 node for the relevant function type. The new node we create
5943 will be a variant of the main variant of the original function
5946 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
5948 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
5952 /* Store the parameter declarations into the current function declaration.
5953 This is called after parsing the parameter declarations, before
5954 digesting the body of the function.
5956 For an old-style definition, construct a prototype out of the old-style
5957 parameter declarations and inject it into the function's type. */
5960 store_parm_decls (void)
5962 tree fndecl = current_function_decl;
5964 /* The function containing FNDECL, if any. */
5965 tree context = decl_function_context (fndecl);
5967 /* True if this definition is written with a prototype. */
5968 bool prototype = (current_function_parms
5969 && TREE_CODE (current_function_parms) != TREE_LIST);
5972 store_parm_decls_newstyle ();
5974 store_parm_decls_oldstyle ();
5976 /* The next call to pushlevel will be a function body. */
5978 next_is_function_body = true;
5980 /* Write a record describing this function definition to the prototypes
5981 file (if requested). */
5983 gen_aux_info_record (fndecl, 1, 0, prototype);
5985 /* Initialize the RTL code for the function. */
5986 allocate_struct_function (fndecl);
5988 /* Begin the statement tree for this function. */
5989 begin_stmt_tree (&DECL_SAVED_TREE (fndecl));
5991 /* If this is a nested function, save away the sizes of any
5992 variable-size types so that we can expand them when generating
5998 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
5999 = nreverse (get_pending_sizes ());
6000 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
6003 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
6006 /* This function is being processed in whole-function mode. */
6007 cfun->x_whole_function_mode_p = 1;
6009 /* Even though we're inside a function body, we still don't want to
6010 call expand_expr to calculate the size of a variable-sized array.
6011 We haven't necessarily assigned RTL to all variables yet, so it's
6012 not safe to try to expand expressions involving them. */
6013 immediate_size_expand = 0;
6014 cfun->x_dont_save_pending_sizes_p = 1;
6017 /* Finish up a function declaration and compile that function
6018 all the way to assembler language output. The free the storage
6019 for the function definition.
6021 This is called after parsing the body of the function definition. */
6024 finish_function (void)
6026 tree fndecl = current_function_decl;
6028 /* When a function declaration is totally empty, e.g.
6030 (the argument list is irrelevant) the compstmt rule will not
6031 bother calling pushlevel/poplevel, which means we get here with
6032 the scope stack out of sync. Detect this situation by noticing
6033 that current_scope is still as store_parm_decls left it, and do
6034 a dummy push/pop to get back to consistency.
6035 Note that the call to pushlevel does not actually push another
6036 scope - see there for details. */
6038 if (current_scope->parm_flag && next_is_function_body)
6044 if (TREE_CODE (fndecl) == FUNCTION_DECL
6045 && targetm.calls.promote_prototypes (TREE_TYPE (fndecl)))
6047 tree args = DECL_ARGUMENTS (fndecl);
6048 for (; args; args = TREE_CHAIN (args))
6050 tree type = TREE_TYPE (args);
6051 if (INTEGRAL_TYPE_P (type)
6052 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
6053 DECL_ARG_TYPE (args) = integer_type_node;
6057 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6058 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6060 /* Must mark the RESULT_DECL as being in this function. */
6062 if (DECL_RESULT (fndecl) && DECL_RESULT (fndecl) != error_mark_node)
6063 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6065 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6067 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6068 != integer_type_node)
6070 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6071 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6073 pedwarn ("%Jreturn type of '%D' is not `int'", fndecl, fndecl);
6077 #ifdef DEFAULT_MAIN_RETURN
6078 /* Make it so that `main' always returns success by default. */
6079 DEFAULT_MAIN_RETURN;
6082 c_expand_return (integer_zero_node);
6087 finish_fname_decls ();
6089 /* Tie off the statement tree for this function. */
6090 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6092 /* Complain if there's just no return statement. */
6093 if (warn_return_type
6094 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6095 && !current_function_returns_value && !current_function_returns_null
6096 /* Don't complain if we abort. */
6097 && !current_function_returns_abnormally
6098 /* Don't warn for main(). */
6099 && !MAIN_NAME_P (DECL_NAME (fndecl))
6100 /* Or if they didn't actually specify a return type. */
6101 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6102 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6103 inline function, as we might never be compiled separately. */
6104 && DECL_INLINE (fndecl))
6105 warning ("no return statement in function returning non-void");
6107 /* With just -Wextra, complain only if function returns both with
6108 and without a value. */
6110 && current_function_returns_value
6111 && current_function_returns_null)
6112 warning ("this function may return with or without a value");
6114 /* We're leaving the context of this function, so zap cfun. It's still in
6115 DECL_SAVED_INSNS, and we'll restore it in tree_rest_of_compilation. */
6118 /* ??? Objc emits functions after finalizing the compilation unit.
6119 This should be cleaned up later and this conditional removed. */
6120 if (!cgraph_global_info_ready)
6121 cgraph_finalize_function (fndecl, false);
6123 c_expand_body (fndecl);
6124 current_function_decl = NULL;
6127 /* Generate the RTL for a deferred function FNDECL. */
6130 c_expand_deferred_function (tree fndecl)
6132 /* DECL_INLINE or DECL_RESULT might got cleared after the inline
6133 function was deferred, e.g. in duplicate_decls. */
6134 if (DECL_INLINE (fndecl) && DECL_RESULT (fndecl))
6136 if (flag_inline_trees)
6138 timevar_push (TV_INTEGRATION);
6139 optimize_inline_calls (fndecl);
6140 timevar_pop (TV_INTEGRATION);
6142 c_expand_body (fndecl);
6143 current_function_decl = NULL;
6147 /* Generate the RTL for the body of FNDECL. If NESTED_P is nonzero,
6148 then we are already in the process of generating RTL for another
6152 c_expand_body_1 (tree fndecl, int nested_p)
6156 /* Make sure that we will evaluate variable-sized types involved
6157 in our function's type. */
6158 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6160 /* Squirrel away our current state. */
6161 push_function_context ();
6164 tree_rest_of_compilation (fndecl, nested_p);
6167 /* Return to the enclosing function. */
6168 pop_function_context ();
6170 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6172 if (targetm.have_ctors_dtors)
6173 (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
6174 DEFAULT_INIT_PRIORITY);
6176 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6179 if (DECL_STATIC_DESTRUCTOR (fndecl))
6181 if (targetm.have_ctors_dtors)
6182 (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
6183 DEFAULT_INIT_PRIORITY);
6185 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6189 /* Like c_expand_body_1 but only for unnested functions. */
6192 c_expand_body (tree fndecl)
6195 if (DECL_INITIAL (fndecl) && DECL_INITIAL (fndecl) != error_mark_node)
6196 c_expand_body_1 (fndecl, 0);
6199 /* Check the declarations given in a for-loop for satisfying the C99
6202 check_for_loop_decls (void)
6208 /* If we get here, declarations have been used in a for loop without
6209 the C99 for loop scope. This doesn't make much sense, so don't
6211 error ("'for' loop initial declaration used outside C99 mode");
6214 /* C99 subclause 6.8.5 paragraph 3:
6216 [#3] The declaration part of a for statement shall only
6217 declare identifiers for objects having storage class auto or
6220 It isn't clear whether, in this sentence, "identifiers" binds to
6221 "shall only declare" or to "objects" - that is, whether all identifiers
6222 declared must be identifiers for objects, or whether the restriction
6223 only applies to those that are. (A question on this in comp.std.c
6224 in November 2000 received no answer.) We implement the strictest
6225 interpretation, to avoid creating an extension which later causes
6228 for (t = current_scope->tags; t; t = TREE_CHAIN (t))
6230 if (TREE_PURPOSE (t) != 0)
6232 enum tree_code code = TREE_CODE (TREE_VALUE (t));
6234 if (code == RECORD_TYPE)
6235 error ("'struct %s' declared in 'for' loop initial declaration",
6236 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6237 else if (code == UNION_TYPE)
6238 error ("'union %s' declared in 'for' loop initial declaration",
6239 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6241 error ("'enum %s' declared in 'for' loop initial declaration",
6242 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6246 for (t = getdecls (); t; t = TREE_CHAIN (t))
6248 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
6249 error ("%Jdeclaration of non-variable '%D' in 'for' loop "
6250 "initial declaration", t, t);
6251 else if (TREE_STATIC (t))
6252 error ("%Jdeclaration of static variable '%D' in 'for' loop "
6253 "initial declaration", t, t);
6254 else if (DECL_EXTERNAL (t))
6255 error ("%Jdeclaration of 'extern' variable '%D' in 'for' loop "
6256 "initial declaration", t, t);
6260 /* Save and reinitialize the variables
6261 used during compilation of a C function. */
6264 c_push_function_context (struct function *f)
6266 struct language_function *p;
6267 p = ggc_alloc (sizeof (struct language_function));
6270 p->base.x_stmt_tree = c_stmt_tree;
6271 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
6272 p->x_in_iteration_stmt = c_in_iteration_stmt;
6273 p->x_in_case_stmt = c_in_case_stmt;
6274 p->returns_value = current_function_returns_value;
6275 p->returns_null = current_function_returns_null;
6276 p->returns_abnormally = current_function_returns_abnormally;
6277 p->warn_about_return_type = warn_about_return_type;
6278 p->extern_inline = current_extern_inline;
6281 /* Restore the variables used during compilation of a C function. */
6284 c_pop_function_context (struct function *f)
6286 struct language_function *p = f->language;
6288 if (DECL_SAVED_INSNS (current_function_decl) == 0
6289 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6291 /* Stop pointing to the local nodes about to be freed. */
6292 /* But DECL_INITIAL must remain nonzero so we know this
6293 was an actual function definition. */
6294 DECL_INITIAL (current_function_decl) = error_mark_node;
6295 DECL_ARGUMENTS (current_function_decl) = 0;
6298 c_stmt_tree = p->base.x_stmt_tree;
6299 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
6300 c_in_iteration_stmt = p->x_in_iteration_stmt;
6301 c_in_case_stmt = p->x_in_case_stmt;
6302 current_function_returns_value = p->returns_value;
6303 current_function_returns_null = p->returns_null;
6304 current_function_returns_abnormally = p->returns_abnormally;
6305 warn_about_return_type = p->warn_about_return_type;
6306 current_extern_inline = p->extern_inline;
6311 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6314 c_dup_lang_specific_decl (tree decl)
6316 struct lang_decl *ld;
6318 if (!DECL_LANG_SPECIFIC (decl))
6321 ld = ggc_alloc (sizeof (struct lang_decl));
6322 memcpy (ld, DECL_LANG_SPECIFIC (decl), sizeof (struct lang_decl));
6323 DECL_LANG_SPECIFIC (decl) = ld;
6326 /* The functions below are required for functionality of doing
6327 function at once processing in the C front end. Currently these
6328 functions are not called from anywhere in the C front end, but as
6329 these changes continue, that will change. */
6331 /* Returns nonzero if the current statement is a full expression,
6332 i.e. temporaries created during that statement should be destroyed
6333 at the end of the statement. */
6336 stmts_are_full_exprs_p (void)
6341 /* Returns the stmt_tree (if any) to which statements are currently
6342 being added. If there is no active statement-tree, NULL is
6346 current_stmt_tree (void)
6348 return &c_stmt_tree;
6351 /* Returns the stack of SCOPE_STMTs for the current function. */
6354 current_scope_stmt_stack (void)
6356 return &c_scope_stmt_stack;
6359 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6363 anon_aggr_type_p (tree node ATTRIBUTE_UNUSED)
6368 /* Dummy function in place of callback used by C++. */
6371 extract_interface_info (void)
6375 /* Return a new COMPOUND_STMT, after adding it to the current
6379 c_begin_compound_stmt (void)
6383 /* Create the COMPOUND_STMT. */
6384 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
6389 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
6393 c_expand_decl_stmt (tree t)
6395 tree decl = DECL_STMT_DECL (t);
6397 /* Expand nested functions. */
6398 if (TREE_CODE (decl) == FUNCTION_DECL
6399 && DECL_CONTEXT (decl) == current_function_decl
6400 && DECL_SAVED_TREE (decl))
6401 c_expand_body_1 (decl, 1);
6404 /* Return the global value of T as a symbol. */
6407 identifier_global_value (tree t)
6409 tree decl = IDENTIFIER_SYMBOL_VALUE (t);
6410 if (decl == 0 || DECL_FILE_SCOPE_P (decl))
6413 /* Shadowed by something else; find the true global value. */
6414 for (decl = global_scope->names; decl; decl = TREE_CHAIN (decl))
6415 if (DECL_NAME (decl) == t)
6418 /* Only local values for this decl. */
6422 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6423 otherwise the name is found in ridpointers from RID_INDEX. */
6426 record_builtin_type (enum rid rid_index, const char *name, tree type)
6430 id = ridpointers[(int) rid_index];
6432 id = get_identifier (name);
6433 pushdecl (build_decl (TYPE_DECL, id, type));
6436 /* Build the void_list_node (void_type_node having been created). */
6438 build_void_list_node (void)
6440 tree t = build_tree_list (NULL_TREE, void_type_node);
6444 /* Return something to represent absolute declarators containing a *.
6445 TARGET is the absolute declarator that the * contains.
6446 TYPE_QUALS_ATTRS is a list of modifiers such as const or volatile
6447 to apply to the pointer type, represented as identifiers, possible mixed
6450 We return an INDIRECT_REF whose "contents" are TARGET (inside a TREE_LIST,
6451 if attributes are present) and whose type is the modifier list. */
6454 make_pointer_declarator (tree type_quals_attrs, tree target)
6457 tree itarget = target;
6458 split_specs_attrs (type_quals_attrs, &quals, &attrs);
6459 if (attrs != NULL_TREE)
6460 itarget = tree_cons (attrs, target, NULL_TREE);
6461 return build1 (INDIRECT_REF, quals, itarget);
6464 /* A wrapper around lhd_set_decl_assembler_name that gives static
6465 variables their C names if they are at file scope and only one
6466 translation unit is being compiled, for backwards compatibility
6467 with certain bizarre assembler hacks (like crtstuff.c). */
6470 c_static_assembler_name (tree decl)
6472 if (num_in_fnames == 1
6473 && !TREE_PUBLIC (decl) && DECL_CONTEXT (decl)
6474 && TREE_CODE (DECL_CONTEXT (decl)) == TRANSLATION_UNIT_DECL)
6475 SET_DECL_ASSEMBLER_NAME (decl, DECL_NAME (decl));
6477 lhd_set_decl_assembler_name (decl);
6480 /* Hash and equality functions for link_hash_table: key off
6481 DECL_ASSEMBLER_NAME. */
6484 link_hash_hash (const void *x_p)
6487 return (hashval_t) (long)DECL_ASSEMBLER_NAME (x);
6491 link_hash_eq (const void *x1_p, const void *x2_p)
6493 tree x1 = (tree)x1_p;
6494 tree x2 = (tree)x2_p;
6495 return DECL_ASSEMBLER_NAME (x1) == DECL_ASSEMBLER_NAME (x2);
6498 /* Propagate information between definitions and uses between multiple
6499 translation units in TU_LIST based on linkage rules. */
6502 merge_translation_unit_decls (void)
6504 const tree tu_list = current_file_decl;
6507 htab_t link_hash_table;
6510 /* Create the BLOCK that poplevel would have created, but don't
6511 actually call poplevel since that's expensive. */
6512 block = make_node (BLOCK);
6513 BLOCK_VARS (block) = current_scope->names;
6514 TREE_USED (block) = 1;
6515 DECL_INITIAL (current_file_decl) = block;
6517 /* If only one translation unit seen, no copying necessary. */
6518 if (TREE_CHAIN (tu_list) == NULL_TREE)
6521 link_hash_table = htab_create (1021, link_hash_hash, link_hash_eq, NULL);
6523 /* Enter any actual definitions into the hash table. */
6524 for (tu = tu_list; tu; tu = TREE_CHAIN (tu))
6525 for (decl = BLOCK_VARS (DECL_INITIAL (tu)); decl; decl = TREE_CHAIN (decl))
6526 if (TREE_PUBLIC (decl) && ! DECL_EXTERNAL (decl))
6529 slot = htab_find_slot (link_hash_table, decl, INSERT);
6531 /* If we've already got a definition, work out which one is
6532 the real one, put it into the hash table, and make the
6533 other one DECL_EXTERNAL. This is important to avoid
6534 putting out two definitions of the same symbol in the
6538 tree old_decl = (tree) *slot;
6540 /* If this is weak or common or whatever, suppress it
6541 in favor of the other definition. */
6542 if (DECL_WEAK (decl))
6543 DECL_EXTERNAL (decl) = 1;
6544 else if (DECL_WEAK (old_decl) && ! DECL_WEAK (decl))
6545 DECL_EXTERNAL (old_decl) = 1;
6546 else if (DECL_COMMON (decl) || DECL_ONE_ONLY (decl))
6547 DECL_EXTERNAL (decl) = 1;
6548 else if (DECL_COMMON (old_decl) || DECL_ONE_ONLY (old_decl))
6549 DECL_EXTERNAL (old_decl) = 1;
6551 if (DECL_EXTERNAL (decl))
6553 DECL_INITIAL (decl) = NULL_TREE;
6554 DECL_COMMON (decl) = 0;
6555 DECL_ONE_ONLY (decl) = 0;
6556 DECL_WEAK (decl) = 0;
6558 else if (DECL_EXTERNAL (old_decl))
6560 DECL_INITIAL (old_decl) = NULL_TREE;
6561 DECL_COMMON (old_decl) = 0;
6562 DECL_ONE_ONLY (old_decl) = 0;
6563 DECL_WEAK (old_decl) = 0;
6568 error ("%Jredefinition of global '%D'", decl, decl);
6569 error ("%J'%D' previously defined here", old_decl, old_decl);
6576 /* Now insert the desired information from all the definitions
6577 into any plain declarations. */
6578 for (tu = tu_list; tu; tu = TREE_CHAIN (tu))
6579 for (decl = BLOCK_VARS (DECL_INITIAL (tu)); decl; decl = TREE_CHAIN (decl))
6580 if (TREE_PUBLIC (decl) && DECL_EXTERNAL (decl))
6583 global_decl = htab_find (link_hash_table, decl);
6588 /* Print any appropriate error messages, and partially merge
6590 (void) duplicate_decls (decl, global_decl);
6593 htab_delete (link_hash_table);
6596 /* Perform final processing on file-scope data. */
6599 c_write_global_declarations(void)
6603 for (link = current_file_decl; link; link = TREE_CHAIN (link))
6605 tree globals = BLOCK_VARS (DECL_INITIAL (link));
6606 int len = list_length (globals);
6607 tree *vec = xmalloc (sizeof (tree) * len);
6611 /* Process the decls in the order they were written. */
6613 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
6616 wrapup_global_declarations (vec, len);
6618 check_global_declarations (vec, len);
6625 /* Reset the parser's state in preparation for a new file. */
6628 c_reset_state (void)
6631 tree file_scope_decl;
6633 /* Pop the global scope. */
6634 if (current_scope != global_scope)
6635 current_scope = global_scope;
6636 file_scope_decl = current_file_decl;
6637 DECL_INITIAL (file_scope_decl) = poplevel (1, 0, 0);
6638 BLOCK_SUPERCONTEXT (DECL_INITIAL (file_scope_decl)) = file_scope_decl;
6639 truly_local_externals = NULL_TREE;
6641 /* Start a new global binding level. */
6643 global_scope = current_scope;
6644 current_file_decl = build_decl (TRANSLATION_UNIT_DECL, NULL, NULL);
6645 TREE_CHAIN (current_file_decl) = file_scope_decl;
6647 /* Reintroduce the builtin declarations. */
6648 for (link = first_builtin_decl;
6649 link != TREE_CHAIN (last_builtin_decl);
6650 link = TREE_CHAIN (link))
6651 pushdecl (copy_node (link));
6654 #include "gt-c-decl.h"