1 /* Definitions for C parsing and type checking.
2 Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998,
3 1999, 2000 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
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 /* Wrapping c_lang_decl in another struct is an unfortunate
49 struct c_lang_decl base;
52 /* Macros for access to language-specific slots in an identifier. */
53 /* Each of these slots contains a DECL node or null. */
55 /* This represents the value which the identifier has in the
56 file-scope namespace. */
57 #define IDENTIFIER_GLOBAL_VALUE(NODE) \
58 (((struct lang_identifier *) (NODE))->global_value)
59 /* This represents the value which the identifier has in the current
61 #define IDENTIFIER_LOCAL_VALUE(NODE) \
62 (((struct lang_identifier *) (NODE))->local_value)
63 /* This represents the value which the identifier has as a label in
64 the current label scope. */
65 #define IDENTIFIER_LABEL_VALUE(NODE) \
66 (((struct lang_identifier *) (NODE))->label_value)
67 /* This records the extern decl of this identifier, if it has had one
68 at any point in this compilation. */
69 #define IDENTIFIER_LIMBO_VALUE(NODE) \
70 (((struct lang_identifier *) (NODE))->limbo_value)
71 /* This records the implicit function decl of this identifier, if it
72 has had one at any point in this compilation. */
73 #define IDENTIFIER_IMPLICIT_DECL(NODE) \
74 (((struct lang_identifier *) (NODE))->implicit_decl)
75 /* This is the last function in which we printed an "undefined variable"
76 message for this identifier. Value is a FUNCTION_DECL or null. */
77 #define IDENTIFIER_ERROR_LOCUS(NODE) \
78 (((struct lang_identifier *) (NODE))->error_locus)
80 /* In identifiers, C uses the following fields in a special way:
81 TREE_PUBLIC to record that there was a previous local extern decl.
82 TREE_USED to record that such a decl was used.
83 TREE_ADDRESSABLE to record that the address of such a decl was used. */
85 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only. */
86 #define C_TYPE_FIELDS_READONLY(type) TREE_LANG_FLAG_1 (type)
88 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile. */
89 #define C_TYPE_FIELDS_VOLATILE(type) TREE_LANG_FLAG_2 (type)
91 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
92 nonzero if the definition of the type has already started. */
93 #define C_TYPE_BEING_DEFINED(type) TYPE_LANG_FLAG_0 (type)
95 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
96 keyword. C_RID_CODE (node) is then the RID_* value of the keyword,
97 and C_RID_YYCODE is the token number wanted by Yacc. */
99 #define C_IS_RESERVED_WORD(id) TREE_LANG_FLAG_0 (id)
101 /* In a RECORD_TYPE, a sorted array of the fields of the type. */
108 /* Record whether a type or decl was written with nonconstant size.
109 Note that TYPE_SIZE may have simplified to a constant. */
110 #define C_TYPE_VARIABLE_SIZE(type) TYPE_LANG_FLAG_1 (type)
111 #define C_DECL_VARIABLE_SIZE(type) DECL_LANG_FLAG_0 (type)
113 #if 0 /* Not used. */
114 /* Record whether a decl for a function or function pointer has
115 already been mentioned (in a warning) because it was called
116 but didn't have a prototype. */
117 #define C_MISSING_PROTOTYPE_WARNED(decl) DECL_LANG_FLAG_2(decl)
120 /* Store a value in that field. */
121 #define C_SET_EXP_ORIGINAL_CODE(exp, code) \
122 (TREE_COMPLEXITY (exp) = (int) (code))
124 /* Record whether a typedef for type `int' was actually `signed int'. */
125 #define C_TYPEDEF_EXPLICITLY_SIGNED(exp) DECL_LANG_FLAG_1 ((exp))
127 /* Nonzero for a declaration of a built in function if there has been no
128 occasion that would declare the function in ordinary C.
129 Using the function draws a pedantic warning in this case. */
130 #define C_DECL_ANTICIPATED(exp) DECL_LANG_FLAG_3 ((exp))
132 /* For FUNCTION_TYPE, a hidden list of types of arguments. The same as
133 TYPE_ARG_TYPES for functions with prototypes, but created for functions
134 without prototypes. */
135 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_NONCOPIED_PARTS (NODE)
138 /* in c-lang.c and objc-act.c */
139 extern tree lookup_interface PARAMS ((tree));
140 extern tree is_class_name PARAMS ((tree));
141 extern void maybe_objc_check_decl PARAMS ((tree));
142 extern void finish_file PARAMS ((void));
143 extern int maybe_objc_comptypes PARAMS ((tree, tree, int));
144 extern tree maybe_building_objc_message_expr PARAMS ((void));
145 extern int recognize_objc_keyword PARAMS ((void));
146 extern tree lookup_objc_ivar PARAMS ((tree));
149 extern void c_parse_init PARAMS ((void));
150 extern int yyparse_1 PARAMS ((void));
152 /* in c-aux-info.c */
153 extern void gen_aux_info_record PARAMS ((tree, int, int, int));
156 extern tree build_array_declarator PARAMS ((tree, tree, int, int));
157 extern tree build_enumerator PARAMS ((tree, tree));
159 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P) \
160 c_build_qualified_type (TYPE, \
161 ((CONST_P) ? TYPE_QUAL_CONST : 0) | \
162 ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
163 extern int c_decode_option PARAMS ((int, char **));
164 extern void c_mark_varargs PARAMS ((void));
165 extern void check_for_loop_decls PARAMS ((void));
166 extern tree check_identifier PARAMS ((tree, tree));
167 extern void clear_parm_order PARAMS ((void));
168 extern tree combine_parm_decls PARAMS ((tree, tree, int));
169 extern int complete_array_type PARAMS ((tree, tree, int));
170 extern void declare_parm_level PARAMS ((int));
171 extern tree define_label PARAMS ((const char *, int,
173 extern void delete_block PARAMS ((tree));
174 extern void finish_decl PARAMS ((tree, tree, tree));
175 extern void finish_decl_top_level PARAMS ((tree, tree, tree));
176 extern tree finish_enum PARAMS ((tree, tree, tree));
177 extern void finish_function PARAMS ((int));
178 extern tree finish_struct PARAMS ((tree, tree, tree));
179 extern tree get_parm_info PARAMS ((int));
180 extern tree grokfield PARAMS ((const char *, int, tree, tree, tree));
181 extern tree groktypename PARAMS ((tree));
182 extern tree groktypename_in_parm_context PARAMS ((tree));
183 extern tree implicitly_declare PARAMS ((tree));
184 extern void implicit_decl_warning PARAMS ((tree));
185 extern int in_parm_level_p PARAMS ((void));
186 extern void keep_next_level PARAMS ((void));
187 extern int kept_level_p PARAMS ((void));
188 extern tree lookup_name PARAMS ((tree));
189 extern tree lookup_name_current_level PARAMS ((tree));
190 extern tree lookup_name_current_level_global PARAMS ((tree));
191 extern void parmlist_tags_warning PARAMS ((void));
192 extern void pending_xref_error PARAMS ((void));
193 extern void mark_c_function_context PARAMS ((struct function *));
194 extern void push_c_function_context PARAMS ((struct function *));
195 extern void pop_c_function_context PARAMS ((struct function *));
196 extern void pop_label_level PARAMS ((void));
197 extern void push_label_level PARAMS ((void));
198 extern void push_parm_decl PARAMS ((tree));
199 extern tree pushdecl_top_level PARAMS ((tree));
200 extern void pushtag PARAMS ((tree, tree));
201 extern tree set_array_declarator_type PARAMS ((tree, tree, int));
202 extern tree shadow_label PARAMS ((tree));
203 extern void shadow_record_fields PARAMS ((tree));
204 extern void shadow_tag PARAMS ((tree));
205 extern void shadow_tag_warned PARAMS ((tree, int));
206 extern tree start_enum PARAMS ((tree));
207 extern int start_function PARAMS ((tree, tree, tree,
209 extern tree start_decl PARAMS ((tree, tree, int,
211 extern tree start_struct PARAMS ((enum tree_code, tree));
212 extern void store_parm_decls PARAMS ((void));
213 extern tree xref_tag PARAMS ((enum tree_code, tree));
214 extern tree c_begin_compound_stmt PARAMS ((void));
215 extern void c_expand_decl_stmt PARAMS ((tree));
218 extern tree require_complete_type PARAMS ((tree));
219 extern int comptypes PARAMS ((tree, tree));
220 extern tree c_sizeof PARAMS ((tree));
221 extern tree c_sizeof_nowarn PARAMS ((tree));
222 extern tree c_size_in_bytes PARAMS ((tree));
223 extern tree c_alignof PARAMS ((tree));
224 extern tree c_alignof_expr PARAMS ((tree));
225 extern tree build_component_ref PARAMS ((tree, tree));
226 extern tree build_indirect_ref PARAMS ((tree, const char *));
227 extern tree build_array_ref PARAMS ((tree, tree));
228 extern tree build_external_ref PARAMS ((tree, int));
229 extern tree parser_build_binary_op PARAMS ((enum tree_code,
231 extern void readonly_warning PARAMS ((tree, const char *));
232 extern tree build_conditional_expr PARAMS ((tree, tree, tree));
233 extern tree build_compound_expr PARAMS ((tree));
234 extern tree c_cast_expr PARAMS ((tree, tree));
235 extern tree build_c_cast PARAMS ((tree, tree));
236 extern tree build_modify_expr PARAMS ((tree, enum tree_code,
238 extern void store_init_value PARAMS ((tree, tree));
239 extern void error_init PARAMS ((const char *));
240 extern void pedwarn_init PARAMS ((const char *));
241 extern void start_init PARAMS ((tree, tree, int));
242 extern void finish_init PARAMS ((void));
243 extern void really_start_incremental_init PARAMS ((tree));
244 extern void push_init_level PARAMS ((int));
245 extern tree pop_init_level PARAMS ((int));
246 extern void set_init_index PARAMS ((tree, tree));
247 extern void set_init_label PARAMS ((tree));
248 extern void process_init_element PARAMS ((tree));
249 extern void pedwarn_c99 PARAMS ((const char *, ...))
251 extern tree c_start_case PARAMS ((tree));
252 extern void c_finish_case PARAMS ((void));
253 extern tree simple_asm_stmt PARAMS ((tree));
254 extern tree build_asm_stmt PARAMS ((tree, tree, tree,
257 /* Set to 0 at beginning of a function definition, set to 1 if
258 a return statement that specifies a return value is seen. */
260 extern int current_function_returns_value;
262 /* Set to 0 at beginning of a function definition, set to 1 if
263 a return statement with no argument is seen. */
265 extern int current_function_returns_null;
267 /* Nonzero means the expression being parsed will never be evaluated.
268 This is a count, since unevaluated expressions can nest. */
270 extern int skip_evaluation;
272 /* Nonzero means `$' can be in an identifier. */
274 extern int dollars_in_ident;
276 /* Nonzero means allow type mismatches in conditional expressions;
277 just make their values `void'. */
279 extern int flag_cond_mismatch;
281 /* Nonzero means don't recognize the keyword `asm'. */
283 extern int flag_no_asm;
285 /* Nonzero means warn about implicit declarations. */
287 extern int warn_implicit;
289 /* Nonzero means warn about sizeof (function) or addition/subtraction
290 of function pointers. */
292 extern int warn_pointer_arith;
294 /* Nonzero means warn for all old-style non-prototype function decls. */
296 extern int warn_strict_prototypes;
298 /* Nonzero means warn about multiple (redundant) decls for the same single
299 variable or function. */
301 extern int warn_redundant_decls;
303 /* Nonzero means warn about extern declarations of objects not at
304 file-scope level and about *all* declarations of functions (whether
305 extern or static) not at file-scope level. Note that we exclude
306 implicit function declarations. To get warnings about those, use
309 extern int warn_nested_externs;
311 /* Nonzero means warn about pointer casts that can drop a type qualifier
312 from the pointer target type. */
314 extern int warn_cast_qual;
316 /* Nonzero means warn when casting a function call to a type that does
317 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
318 when there is no previous declaration of sqrt or malloc. */
320 extern int warn_bad_function_cast;
322 /* Warn about traditional constructs whose meanings changed in ANSI C. */
324 extern int warn_traditional;
326 /* Warn about a subscript that has type char. */
328 extern int warn_char_subscripts;
330 /* Warn if main is suspicious. */
332 extern int warn_main;
334 /* Nonzero means to allow single precision math even if we're generally
335 being traditional. */
336 extern int flag_allow_single_precision;
338 /* Warn if initializer is not completely bracketed. */
340 extern int warn_missing_braces;
342 /* Warn about comparison of signed and unsigned values. */
344 extern int warn_sign_compare;
346 /* Warn about testing equality of floating point numbers. */
348 extern int warn_float_equal;
350 /* Warn about multicharacter constants. */
352 extern int warn_multichar;
354 /* Nonzero means we are reading code that came from a system header file. */
356 extern int system_header_p;
358 /* Warn about implicit declarations. 1 = warning, 2 = error. */
359 extern int mesg_implicit_function_declaration;
362 extern void finish_incomplete_decl PARAMS ((tree));
364 #endif /* not _C_TREE_H */