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