mirror of
git://gcc.gnu.org/git/gcc.git
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339a28b96a
2003-04-10 Zack Weinberg <zack@codesourcery.com>
* c-decl.c (struct binding_level): Add shadowed_tags and
function_body; remove this_block, tag_transparent, and
subblocks_tag_transparent; update comments.
(clear_binding_level, lookup_tag_reverse): Kill.
(make_binding_level): Use ggc_alloc_cleared or memset.
(lookup_tag): Remove struct binding_level* parameter. All
callers changed. Just look at IDENTIFIER_TAG_VALUE, and
current_binding_level->tags if asked for thislevel_only or if
we might have to diagnose "struct foo; union foo;"
(pushlevel): Ignore argument. Do not push another binding
level on the transition from the parameters to the top level
of the function body; just tweak the flags and proceed.
(poplevel): Overhaul. Clear IDENTIFIER_TAG_VALUEs; on exiting
a function body, separate the parameter list from the
top-level local variables.
(set_block): Do nothing.
(pushtag): Set IDENTIFIER_TAG_VALUE and add an entry to
shadowed_tags if necessary.
(warn_if_shadowing): Nuke the special case for local shadowing
parameter.
(pushdecl): Do not create a shadow entry if we are replacing
an older decl in the same binding level.
(pushdecl_function_level): Tweak for new way of indicating
function scope.
(shadow_tag_warned): Use TYPE_NAME, not lookup_tag_reverse.
(start_function): Don't set subblocks_tag_transparent.
(finish_function): Fix up the binding_level stack for totally
empty functions. Otherwise, don't call poplevel.
* c-common.c (shadow_warning): MANDATORY argument is no longer
necessary. Always use plain warning.
* c-common.h: Update to match.
* cfglayout.c (scope_to_insns_initialize): Clear block when we
hit the FUNCTION_DECL.
* function.c: Do not create cyclic tree structure.
2003-04-10 Zack Weinberg <zack@codesourcery.com>
* c-tree.h (struct lang_identifier): Replace global_value,
local_value members with symbol_value, tag_value. Kill
implicit_decl and limbo_value.
(IDENTIFIER_GLOBAL_VALUE, IDENTIFIER_LOCAL_VALUE,
IDENTIFIER_LIMBO_VALUE, IDENTIFIER_IMPLICIT_DECL,
C_MISSING_PROTOTYPE_WARNED): Kill.
(IDENTIFIER_SYMBOL_VALUE, IDENTIFIER_TAG_VALUE,
C_DECL_IMPLICIT, C_DECL_ISNT_PROTOTYPE): New.
(C_DECL_ANTICIPATED): Rename to C_DECL_INVISIBLE.
(implicit_decl_warning, lookup_name_current_level,
record_function_scope_shadow): Don't prototype.
(pushdecl_function_level): Prototype.
* c-decl.c (truly_local_externals): New variable.
(struct binding_level): Adjust commentary.
(get_function_binding_level, clear_limbo_values,
record_function_scope_shadow): Kill.
(lookup_name_current_level, implicit_decl_warning): Are now static.
(any_external_decl, record_external_decl): New static functions.
(clone_underlying type): Split out of pushdecl.
(c_print_identifier): Update to match changes to struct
lang_identifier.
(poplevel): Delete #if 0 block. Make externals invisible
instead of clearing their IDENTIFIER_SYMBOL_VALUEs. Don't
call clear_limbo_values. Refer to IDENTIFIER_SYMBOL_VALUE not
IDENTIFIER_GLOBAL_VALUE or IDENTIFIER_LOCAL_VALUE.
(duplicate-decls): For real parm decl after a forward decl,
set TREE_ASM_WRITTEN here. Allow void foo(...) followed by
foo(...) { } with only a warning. Say whether a previous
declaration was implicit.
(warn_if_shadowing): Now handles all shadowing, not just
local-over-local. Clarify comments.
(pushdecl): Rewritten. There is no longer a distinction
between global and local symbol values; they're all
IDENTIFIER_SYMBOL_VALUE. Call record_external_decl on all
DECL_EXTERNAL decls, and use any_external_decl to check
against previous externals. Kill #if 0 blocks. Don't
tolerate error_mark_node being NULL.
(pushdecl_top_level): Handle only those cases which
Objective C (the only user) needs.
(pushdecl_function_level): New function.
(implicitly_declare): Create ordinary decls with
C_DECL_IMPLICIT set. Recycle old decls, however they got
created.
(lookup_name): It's always IDENTIFIER_SYMBOL_VALUE. Return 0
for C_DECL_INVISIBLE symbols.
(lookup_name_current_level): Likewise. Use chain_member.
(c_make_fname_decl): Don't muck with DECL_CONTEXT.
Use pushdecl_function_level.
(builtin_function): Use C_DECL_INVISIBLE.
(start_function): Don't muck with IDENTIFIER_IMPLICIT_DECL.
Use C_DECL_ISNT_PROTOTYPE and C_DECL_IMPLICIT.
(store_parm_decls): It's IDENTIFIER_SYMBOL_VALUE now.
(identifier_global_value): Same. Must scan
global_binding_level in extremis.
* c-typeck.c (undeclared_variable): New static function, split
from build_external_ref.
(build_external_ref): Use DECL_CONTEXT, not
IDENTIFIER_LOCAL_VALUE, to decide whether a local hides
an instance variable. Restructure for clarity.
* objc/objc-act.c: Use identifier_global_value, not
IDENTIFIER_GLOBAL_VALUE.
cp:
* decl.c: Update all calls to shadow_warning.
testsuite:
* gcc.c-torture/execute/builtin-noret-2.c: New.
* gcc.c-torture/execute/builtin-noret-2.x: New.
XFAIL builtin-noret-2.c at -O1 and above.
* gcc.dg/redecl.c: New.
* gcc.dg/Wshadow-1.c: Update error regexps.
From-SVN: r65460
316 lines
14 KiB
C
316 lines
14 KiB
C
/* Definitions for C parsing and type checking.
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Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998,
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1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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#ifndef GCC_C_TREE_H
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#define GCC_C_TREE_H
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#include "c-common.h"
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/* Language-dependent contents of an identifier. */
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/* The limbo_value is used for block level extern declarations, which need
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to be type checked against subsequent extern declarations. They can't
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be referenced after they fall out of scope, so they can't be global.
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The rid_code field is used for keywords. It is in all
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lang_identifier nodes, because some keywords are only special in a
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particular context. */
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struct lang_identifier GTY(())
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{
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struct c_common_identifier common_id;
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tree symbol_value;
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tree tag_value;
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tree label_value;
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};
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/* The resulting tree type. */
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union lang_tree_node
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GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
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chain_next ("(union lang_tree_node *)TREE_CHAIN (&%h.generic)")))
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{
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union tree_node GTY ((tag ("0"),
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desc ("tree_node_structure (&%h)")))
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generic;
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struct lang_identifier GTY ((tag ("1"))) identifier;
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};
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/* Language-specific declaration information. */
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struct lang_decl GTY(())
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{
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struct c_lang_decl base;
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/* The return types and parameter types may have variable size.
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This is a list of any SAVE_EXPRs that need to be evaluated to
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compute those sizes. */
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tree pending_sizes;
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};
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/* Macros for access to language-specific slots in an identifier. */
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/* Each of these slots contains a DECL node or null. */
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/* The value of the identifier in the namespace of "ordinary identifiers"
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(data objects, enum constants, functions, typedefs). */
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#define IDENTIFIER_SYMBOL_VALUE(NODE) \
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(((struct lang_identifier *) (NODE))->symbol_value)
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/* The value of the identifier in the namespace of struct, union,
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and enum tags. */
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#define IDENTIFIER_TAG_VALUE(NODE) \
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(((struct lang_identifier *) (NODE))->tag_value)
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/* The value of the identifier in the namespace of labels. */
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#define IDENTIFIER_LABEL_VALUE(NODE) \
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(((struct lang_identifier *) (NODE))->label_value)
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/* In identifiers, C uses the following fields in a special way:
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TREE_PUBLIC to record that there was a previous local extern decl.
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TREE_USED to record that such a decl was used.
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TREE_ADDRESSABLE to record that the address of such a decl was used. */
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/* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only. */
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#define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1 (TYPE)
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/* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile. */
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#define C_TYPE_FIELDS_VOLATILE(TYPE) TREE_LANG_FLAG_2 (TYPE)
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/* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
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nonzero if the definition of the type has already started. */
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#define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE)
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/* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
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keyword. C_RID_CODE (node) is then the RID_* value of the keyword,
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and C_RID_YYCODE is the token number wanted by Yacc. */
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#define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
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/* This function was declared inline. This flag controls the linkage
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semantics of 'inline'; whether or not the function is inlined is
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controlled by DECL_INLINE. */
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#define DECL_DECLARED_INLINE_P(NODE) \
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(DECL_LANG_SPECIFIC (NODE)->base.declared_inline)
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/* In a RECORD_TYPE, a sorted array of the fields of the type. */
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struct lang_type GTY(())
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{
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int len;
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tree GTY((length ("%h.len"))) elts[1];
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};
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/* Record whether a type or decl was written with nonconstant size.
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Note that TYPE_SIZE may have simplified to a constant. */
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#define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
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#define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
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/* Store a value in that field. */
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#define C_SET_EXP_ORIGINAL_CODE(EXP, CODE) \
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(TREE_COMPLEXITY (EXP) = (int) (CODE))
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/* Record whether a typedef for type `int' was actually `signed int'. */
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#define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
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/* For a FUNCTION_DECL, nonzero if it was defined without an explicit
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return type. */
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#define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP)
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/* For a FUNCTION_DECL, nonzero if it was an implicit declaration. */
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#define C_DECL_IMPLICIT(EXP) DECL_LANG_FLAG_2 (EXP)
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/* Nonzero for a declaration of an external object which is not
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currently in scope. This is either a built-in declaration of
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a library function, before a real declaration has been seen,
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or a declaration that appeared in an inner scope that has ended. */
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#define C_DECL_INVISIBLE(EXP) DECL_LANG_FLAG_3 (EXP)
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/* Nonzero for a decl which either doesn't exist or isn't a prototype.
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N.B. Could be simplified if all built-in decls had complete prototypes
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(but this is presently difficult because some of them need FILE*). */
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#define C_DECL_ISNT_PROTOTYPE(EXP) \
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(EXP == 0 \
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|| (TYPE_ARG_TYPES (TREE_TYPE (EXP)) == 0 \
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&& !DECL_BUILT_IN (EXP)))
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/* For FUNCTION_TYPE, a hidden list of types of arguments. The same as
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TYPE_ARG_TYPES for functions with prototypes, but created for functions
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without prototypes. */
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#define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_BINFO (NODE)
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/* in c-lang.c and objc-act.c */
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extern tree lookup_interface PARAMS ((tree));
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extern tree is_class_name PARAMS ((tree));
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extern tree objc_is_id PARAMS ((tree));
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extern void objc_check_decl PARAMS ((tree));
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extern void finish_file PARAMS ((void));
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extern int objc_comptypes PARAMS ((tree, tree, int));
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extern tree objc_message_selector PARAMS ((void));
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extern tree lookup_objc_ivar PARAMS ((tree));
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extern void c_expand_body PARAMS ((tree));
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/* in c-parse.in */
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extern void c_parse_init PARAMS ((void));
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/* in c-aux-info.c */
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extern void gen_aux_info_record PARAMS ((tree, int, int, int));
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/* in c-decl.c */
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extern int global_bindings_p PARAMS ((void));
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extern int kept_level_p PARAMS ((void));
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extern tree getdecls PARAMS ((void));
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extern void pushlevel PARAMS ((int));
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extern tree poplevel PARAMS ((int,int, int));
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extern void insert_block PARAMS ((tree));
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extern void set_block PARAMS ((tree));
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extern tree pushdecl PARAMS ((tree));
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extern void c_insert_default_attributes PARAMS ((tree));
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extern void c_init_decl_processing PARAMS ((void));
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extern void c_dup_lang_specific_decl PARAMS ((tree));
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extern void c_print_identifier PARAMS ((FILE *, tree, int));
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extern tree build_array_declarator PARAMS ((tree, tree, int, int));
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extern tree build_enumerator PARAMS ((tree, tree));
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extern void check_for_loop_decls PARAMS ((void));
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extern void clear_parm_order PARAMS ((void));
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extern int complete_array_type PARAMS ((tree, tree, int));
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extern void declare_parm_level PARAMS ((int));
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extern tree define_label PARAMS ((const char *, int,
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tree));
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extern void finish_decl PARAMS ((tree, tree, tree));
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extern tree finish_enum PARAMS ((tree, tree, tree));
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extern void finish_function PARAMS ((int, int));
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extern tree finish_struct PARAMS ((tree, tree, tree));
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extern tree get_parm_info PARAMS ((int));
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extern tree grokfield PARAMS ((const char *, int, tree, tree, tree));
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extern tree groktypename PARAMS ((tree));
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extern tree groktypename_in_parm_context PARAMS ((tree));
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extern tree implicitly_declare PARAMS ((tree));
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extern int in_parm_level_p PARAMS ((void));
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extern void keep_next_level PARAMS ((void));
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extern tree lookup_name PARAMS ((tree));
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extern void parmlist_tags_warning PARAMS ((void));
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extern void pending_xref_error PARAMS ((void));
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extern void c_push_function_context PARAMS ((struct function *));
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extern void c_pop_function_context PARAMS ((struct function *));
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extern void pop_label_level PARAMS ((void));
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extern void push_label_level PARAMS ((void));
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extern void push_parm_decl PARAMS ((tree));
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extern tree pushdecl_top_level PARAMS ((tree));
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extern tree pushdecl_function_level PARAMS ((tree, tree));
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extern void pushtag PARAMS ((tree, tree));
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extern tree set_array_declarator_type PARAMS ((tree, tree, int));
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extern tree shadow_label PARAMS ((tree));
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extern void shadow_tag PARAMS ((tree));
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extern void shadow_tag_warned PARAMS ((tree, int));
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extern tree start_enum PARAMS ((tree));
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extern int start_function PARAMS ((tree, tree, tree));
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extern tree start_decl PARAMS ((tree, tree, int,
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tree));
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extern tree start_struct PARAMS ((enum tree_code, tree));
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extern void store_parm_decls PARAMS ((void));
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extern tree xref_tag PARAMS ((enum tree_code, tree));
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extern tree c_begin_compound_stmt PARAMS ((void));
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extern void c_expand_deferred_function PARAMS ((tree));
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extern void c_expand_decl_stmt PARAMS ((tree));
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extern tree make_pointer_declarator PARAMS ((tree, tree));
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/* in c-objc-common.c */
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extern int c_disregard_inline_limits PARAMS ((tree));
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extern int c_cannot_inline_tree_fn PARAMS ((tree *));
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extern bool c_objc_common_init PARAMS ((void));
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extern int c_missing_noreturn_ok_p PARAMS ((tree));
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extern void c_objc_common_finish_file PARAMS ((void));
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extern int defer_fn PARAMS ((tree));
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extern bool c_warn_unused_global_decl PARAMS ((tree));
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#define c_build_type_variant(TYPE, CONST_P, VOLATILE_P) \
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c_build_qualified_type ((TYPE), \
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((CONST_P) ? TYPE_QUAL_CONST : 0) | \
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((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
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#define c_sizeof_nowarn(T) c_sizeof_or_alignof_type (T, SIZEOF_EXPR, 0)
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/* in c-typeck.c */
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extern tree require_complete_type PARAMS ((tree));
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extern int comptypes PARAMS ((tree, tree));
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extern tree c_size_in_bytes PARAMS ((tree));
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extern bool c_mark_addressable PARAMS ((tree));
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extern void c_incomplete_type_error PARAMS ((tree, tree));
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extern tree c_type_promotes_to PARAMS ((tree));
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extern tree build_component_ref PARAMS ((tree, tree));
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extern tree build_indirect_ref PARAMS ((tree, const char *));
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extern tree build_array_ref PARAMS ((tree, tree));
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extern tree build_external_ref PARAMS ((tree, int));
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extern tree parser_build_binary_op PARAMS ((enum tree_code,
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tree, tree));
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extern int c_tree_expr_nonnegative_p PARAMS ((tree));
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extern void readonly_warning PARAMS ((tree, const char *));
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extern tree build_conditional_expr PARAMS ((tree, tree, tree));
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extern tree build_compound_expr PARAMS ((tree));
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extern tree c_cast_expr PARAMS ((tree, tree));
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extern tree build_c_cast PARAMS ((tree, tree));
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extern tree build_modify_expr PARAMS ((tree, enum tree_code,
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tree));
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extern void store_init_value PARAMS ((tree, tree));
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extern void error_init PARAMS ((const char *));
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extern void pedwarn_init PARAMS ((const char *));
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extern void start_init PARAMS ((tree, tree, int));
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extern void finish_init PARAMS ((void));
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extern void really_start_incremental_init PARAMS ((tree));
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extern void push_init_level PARAMS ((int));
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extern tree pop_init_level PARAMS ((int));
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extern void set_init_index PARAMS ((tree, tree));
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extern void set_init_label PARAMS ((tree));
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extern void process_init_element PARAMS ((tree));
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extern tree build_compound_literal PARAMS ((tree, tree));
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extern void pedwarn_c99 PARAMS ((const char *, ...))
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ATTRIBUTE_PRINTF_1;
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extern tree c_start_case PARAMS ((tree));
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extern void c_finish_case PARAMS ((void));
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extern tree simple_asm_stmt PARAMS ((tree));
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extern tree build_asm_stmt PARAMS ((tree, tree, tree,
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tree, tree));
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extern tree c_convert_parm_for_inlining PARAMS ((tree, tree, tree));
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/* Set to 0 at beginning of a function definition, set to 1 if
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a return statement that specifies a return value is seen. */
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extern int current_function_returns_value;
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/* Set to 0 at beginning of a function definition, set to 1 if
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a return statement with no argument is seen. */
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extern int current_function_returns_null;
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/* Set to 0 at beginning of a function definition, set to 1 if
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a call to a noreturn function is seen. */
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extern int current_function_returns_abnormally;
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/* Nonzero means we are reading code that came from a system header file. */
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extern int system_header_p;
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/* In c-decl.c */
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extern void c_finish_incomplete_decl PARAMS ((tree));
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extern GTY(()) tree static_ctors;
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extern GTY(()) tree static_dtors;
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#endif /* ! GCC_C_TREE_H */
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