1 /* Definitions for C parsing and type checking.
2 Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998,
3 1999, 2000, 2001, 2002 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
29 /* Language-dependent contents of an identifier. */
31 /* The limbo_value is used for block level extern declarations, which need
32 to be type checked against subsequent extern declarations. They can't
33 be referenced after they fall out of scope, so they can't be global.
35 The rid_code field is used for keywords. It is in all
36 lang_identifier nodes, because some keywords are only special in a
37 particular context. */
39 struct lang_identifier
41 struct c_common_identifier ignore;
42 tree global_value, local_value, label_value, implicit_decl;
43 tree error_locus, limbo_value;
46 /* Language-specific declaration information. */
50 struct c_lang_decl base;
51 /* The return types and parameter types may have variable size.
52 This is a list of any SAVE_EXPRs that need to be evaluated to
53 compute those sizes. */
57 /* Macros for access to language-specific slots in an identifier. */
58 /* Each of these slots contains a DECL node or null. */
60 /* This represents the value which the identifier has in the
61 file-scope namespace. */
62 #define IDENTIFIER_GLOBAL_VALUE(NODE) \
63 (((struct lang_identifier *) (NODE))->global_value)
64 /* This represents the value which the identifier has in the current
66 #define IDENTIFIER_LOCAL_VALUE(NODE) \
67 (((struct lang_identifier *) (NODE))->local_value)
68 /* This represents the value which the identifier has as a label in
69 the current label scope. */
70 #define IDENTIFIER_LABEL_VALUE(NODE) \
71 (((struct lang_identifier *) (NODE))->label_value)
72 /* This records the extern decl of this identifier, if it has had one
73 at any point in this compilation. */
74 #define IDENTIFIER_LIMBO_VALUE(NODE) \
75 (((struct lang_identifier *) (NODE))->limbo_value)
76 /* This records the implicit function decl of this identifier, if it
77 has had one at any point in this compilation. */
78 #define IDENTIFIER_IMPLICIT_DECL(NODE) \
79 (((struct lang_identifier *) (NODE))->implicit_decl)
80 /* This is the last function in which we printed an "undefined variable"
81 message for this identifier. Value is a FUNCTION_DECL or null. */
82 #define IDENTIFIER_ERROR_LOCUS(NODE) \
83 (((struct lang_identifier *) (NODE))->error_locus)
85 /* In identifiers, C uses the following fields in a special way:
86 TREE_PUBLIC to record that there was a previous local extern decl.
87 TREE_USED to record that such a decl was used.
88 TREE_ADDRESSABLE to record that the address of such a decl was used. */
90 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only. */
91 #define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1 (TYPE)
93 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile. */
94 #define C_TYPE_FIELDS_VOLATILE(TYPE) TREE_LANG_FLAG_2 (TYPE)
96 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
97 nonzero if the definition of the type has already started. */
98 #define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE)
100 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
101 keyword. C_RID_CODE (node) is then the RID_* value of the keyword,
102 and C_RID_YYCODE is the token number wanted by Yacc. */
103 #define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
105 /* This function was declared inline. This flag controls the linkage
106 semantics of 'inline'; whether or not the function is inlined is
107 controlled by DECL_INLINE. */
108 #define DECL_DECLARED_INLINE_P(NODE) \
109 (DECL_LANG_SPECIFIC (NODE)->base.declared_inline)
111 /* In a RECORD_TYPE, a sorted array of the fields of the type. */
118 /* Record whether a type or decl was written with nonconstant size.
119 Note that TYPE_SIZE may have simplified to a constant. */
120 #define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
121 #define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
123 #if 0 /* Not used. */
124 /* Record whether a decl for a function or function pointer has
125 already been mentioned (in a warning) because it was called
126 but didn't have a prototype. */
127 #define C_MISSING_PROTOTYPE_WARNED(DECL) DECL_LANG_FLAG_2 (DECL)
130 /* Store a value in that field. */
131 #define C_SET_EXP_ORIGINAL_CODE(EXP, CODE) \
132 (TREE_COMPLEXITY (EXP) = (int) (CODE))
134 /* Record whether a typedef for type `int' was actually `signed int'. */
135 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
137 /* Nonzero for a declaration of a built in function if there has been no
138 occasion that would declare the function in ordinary C.
139 Using the function draws a pedantic warning in this case. */
140 #define C_DECL_ANTICIPATED(EXP) DECL_LANG_FLAG_3 (EXP)
142 /* For FUNCTION_TYPE, a hidden list of types of arguments. The same as
143 TYPE_ARG_TYPES for functions with prototypes, but created for functions
144 without prototypes. */
145 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_BINFO (NODE)
148 /* in c-lang.c and objc-act.c */
149 extern tree lookup_interface PARAMS ((tree));
150 extern tree is_class_name PARAMS ((tree));
151 extern void maybe_objc_check_decl PARAMS ((tree));
152 extern void finish_file PARAMS ((void));
153 extern int maybe_objc_comptypes PARAMS ((tree, tree, int));
154 extern tree maybe_building_objc_message_expr PARAMS ((void));
155 extern int recognize_objc_keyword PARAMS ((void));
156 extern tree lookup_objc_ivar PARAMS ((tree));
160 extern void c_parse_init PARAMS ((void));
161 extern void c_set_yydebug PARAMS ((int));
162 extern int yyparse_1 PARAMS ((void));
164 /* in c-aux-info.c */
165 extern void gen_aux_info_record PARAMS ((tree, int, int, int));
168 extern void c_init_decl_processing PARAMS ((void));
169 extern void c_print_identifier PARAMS ((FILE *, tree, int));
170 extern tree build_array_declarator PARAMS ((tree, tree, int, int));
171 extern tree build_enumerator PARAMS ((tree, tree));
172 extern int c_decode_option PARAMS ((int, char **));
173 extern void c_mark_varargs PARAMS ((void));
174 extern void check_for_loop_decls PARAMS ((void));
175 extern void clear_parm_order PARAMS ((void));
176 extern int complete_array_type PARAMS ((tree, tree, int));
177 extern void declare_parm_level PARAMS ((int));
178 extern tree define_label PARAMS ((const char *, int,
180 extern void finish_decl PARAMS ((tree, tree, tree));
181 extern tree finish_enum PARAMS ((tree, tree, tree));
182 extern void finish_function PARAMS ((int));
183 extern tree finish_struct PARAMS ((tree, tree, tree));
184 extern tree get_parm_info PARAMS ((int));
185 extern tree grokfield PARAMS ((const char *, int, tree, tree, tree));
186 extern tree groktypename PARAMS ((tree));
187 extern tree groktypename_in_parm_context PARAMS ((tree));
188 extern tree implicitly_declare PARAMS ((tree));
189 extern void implicit_decl_warning PARAMS ((tree));
190 extern int in_parm_level_p PARAMS ((void));
191 extern void keep_next_level PARAMS ((void));
192 extern int kept_level_p PARAMS ((void));
193 extern tree lookup_name PARAMS ((tree));
194 extern tree lookup_name_current_level PARAMS ((tree));
195 extern void parmlist_tags_warning PARAMS ((void));
196 extern void pending_xref_error PARAMS ((void));
197 extern void mark_c_function_context PARAMS ((struct function *));
198 extern void push_c_function_context PARAMS ((struct function *));
199 extern void pop_c_function_context PARAMS ((struct function *));
200 extern void pop_label_level PARAMS ((void));
201 extern void push_label_level PARAMS ((void));
202 extern void push_parm_decl PARAMS ((tree));
203 extern tree pushdecl_top_level PARAMS ((tree));
204 extern void pushtag PARAMS ((tree, tree));
205 extern tree set_array_declarator_type PARAMS ((tree, tree, int));
206 extern tree shadow_label PARAMS ((tree));
207 extern void shadow_tag PARAMS ((tree));
208 extern void shadow_tag_warned PARAMS ((tree, int));
209 extern tree start_enum PARAMS ((tree));
210 extern int start_function PARAMS ((tree, tree, tree));
211 extern tree start_decl PARAMS ((tree, tree, int,
213 extern tree start_struct PARAMS ((enum tree_code, tree));
214 extern void store_parm_decls PARAMS ((void));
215 extern tree xref_tag PARAMS ((enum tree_code, tree));
216 extern tree c_begin_compound_stmt PARAMS ((void));
217 extern void c_expand_deferred_function PARAMS ((tree));
218 extern void c_expand_decl_stmt PARAMS ((tree));
221 /* in c-objc-common.c */
222 extern int c_disregard_inline_limits PARAMS ((tree));
223 extern int c_cannot_inline_tree_fn PARAMS ((tree *));
224 extern const char *c_objc_common_init PARAMS ((const char *));
225 extern int c_missing_noreturn_ok_p PARAMS ((tree));
226 extern void c_objc_common_finish_file PARAMS ((void));
227 extern int defer_fn PARAMS ((tree));
229 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P) \
230 c_build_qualified_type ((TYPE), \
231 ((CONST_P) ? TYPE_QUAL_CONST : 0) | \
232 ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
235 extern tree require_complete_type PARAMS ((tree));
236 extern int comptypes PARAMS ((tree, tree));
237 extern tree c_sizeof_nowarn PARAMS ((tree));
238 extern tree c_size_in_bytes PARAMS ((tree));
239 extern tree build_component_ref PARAMS ((tree, tree));
240 extern tree build_indirect_ref PARAMS ((tree, const char *));
241 extern tree build_array_ref PARAMS ((tree, tree));
242 extern tree build_external_ref PARAMS ((tree, int));
243 extern tree parser_build_binary_op PARAMS ((enum tree_code,
245 extern void readonly_warning PARAMS ((tree, const char *));
246 extern tree build_conditional_expr PARAMS ((tree, tree, tree));
247 extern tree build_compound_expr PARAMS ((tree));
248 extern tree c_cast_expr PARAMS ((tree, tree));
249 extern tree build_c_cast PARAMS ((tree, tree));
250 extern tree build_modify_expr PARAMS ((tree, enum tree_code,
252 extern void store_init_value PARAMS ((tree, tree));
253 extern void error_init PARAMS ((const char *));
254 extern void pedwarn_init PARAMS ((const char *));
255 extern void start_init PARAMS ((tree, tree, int));
256 extern void finish_init PARAMS ((void));
257 extern void really_start_incremental_init PARAMS ((tree));
258 extern void push_init_level PARAMS ((int));
259 extern tree pop_init_level PARAMS ((int));
260 extern void set_init_index PARAMS ((tree, tree));
261 extern void set_init_label PARAMS ((tree));
262 extern void process_init_element PARAMS ((tree));
263 extern tree build_compound_literal PARAMS ((tree, tree));
264 extern void pedwarn_c99 PARAMS ((const char *, ...))
266 extern tree c_start_case PARAMS ((tree));
267 extern void c_finish_case PARAMS ((void));
268 extern tree simple_asm_stmt PARAMS ((tree));
269 extern tree build_asm_stmt PARAMS ((tree, tree, tree,
272 /* Set to 0 at beginning of a function definition, set to 1 if
273 a return statement that specifies a return value is seen. */
275 extern int current_function_returns_value;
277 /* Set to 0 at beginning of a function definition, set to 1 if
278 a return statement with no argument is seen. */
280 extern int current_function_returns_null;
282 /* Nonzero means the expression being parsed will never be evaluated.
283 This is a count, since unevaluated expressions can nest. */
285 extern int skip_evaluation;
287 /* Nonzero means `$' can be in an identifier. */
289 extern int dollars_in_ident;
291 /* Nonzero means allow type mismatches in conditional expressions;
292 just make their values `void'. */
294 extern int flag_cond_mismatch;
296 /* Nonzero means don't recognize the keyword `asm'. */
298 extern int flag_no_asm;
300 /* Nonzero means warn about implicit declarations. */
302 extern int warn_implicit;
304 /* Nonzero means warn for all old-style non-prototype function decls. */
306 extern int warn_strict_prototypes;
308 /* Nonzero means warn about multiple (redundant) decls for the same single
309 variable or function. */
311 extern int warn_redundant_decls;
313 /* Nonzero means warn about extern declarations of objects not at
314 file-scope level and about *all* declarations of functions (whether
315 extern or static) not at file-scope level. Note that we exclude
316 implicit function declarations. To get warnings about those, use
319 extern int warn_nested_externs;
321 /* Nonzero means warn about pointer casts that can drop a type qualifier
322 from the pointer target type. */
324 extern int warn_cast_qual;
326 /* Nonzero means warn when casting a function call to a type that does
327 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
328 when there is no previous declaration of sqrt or malloc. */
330 extern int warn_bad_function_cast;
332 /* Warn about traditional constructs whose meanings changed in ANSI C. */
334 extern int warn_traditional;
336 /* Warn about a subscript that has type char. */
338 extern int warn_char_subscripts;
340 /* Warn if main is suspicious. */
342 extern int warn_main;
344 /* Nonzero means to allow single precision math even if we're generally
345 being traditional. */
346 extern int flag_allow_single_precision;
348 /* Warn if initializer is not completely bracketed. */
350 extern int warn_missing_braces;
352 /* Warn about comparison of signed and unsigned values. */
354 extern int warn_sign_compare;
356 /* Warn about testing equality of floating point numbers. */
358 extern int warn_float_equal;
360 /* Warn about multicharacter constants. */
362 extern int warn_multichar;
364 /* Nonzero means we are reading code that came from a system header file. */
366 extern int system_header_p;
368 /* Warn about implicit declarations. 1 = warning, 2 = error. */
369 extern int mesg_implicit_function_declaration;
372 extern void finish_incomplete_decl PARAMS ((tree));
374 extern tree static_ctors;
375 extern tree static_dtors;
377 #endif /* ! GCC_C_TREE_H */