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 struct lang_identifier
35 struct tree_identifier ignore;
36 tree global_value, local_value, label_value, implicit_decl;
37 tree error_locus, limbo_value;
40 /* Macros for access to language-specific slots in an identifier. */
41 /* Each of these slots contains a DECL node or null. */
43 /* This represents the value which the identifier has in the
44 file-scope namespace. */
45 #define IDENTIFIER_GLOBAL_VALUE(NODE) \
46 (((struct lang_identifier *) (NODE))->global_value)
47 /* This represents the value which the identifier has in the current
49 #define IDENTIFIER_LOCAL_VALUE(NODE) \
50 (((struct lang_identifier *) (NODE))->local_value)
51 /* This represents the value which the identifier has as a label in
52 the current label scope. */
53 #define IDENTIFIER_LABEL_VALUE(NODE) \
54 (((struct lang_identifier *) (NODE))->label_value)
55 /* This records the extern decl of this identifier, if it has had one
56 at any point in this compilation. */
57 #define IDENTIFIER_LIMBO_VALUE(NODE) \
58 (((struct lang_identifier *) (NODE))->limbo_value)
59 /* This records the implicit function decl of this identifier, if it
60 has had one at any point in this compilation. */
61 #define IDENTIFIER_IMPLICIT_DECL(NODE) \
62 (((struct lang_identifier *) (NODE))->implicit_decl)
63 /* This is the last function in which we printed an "undefined variable"
64 message for this identifier. Value is a FUNCTION_DECL or null. */
65 #define IDENTIFIER_ERROR_LOCUS(NODE) \
66 (((struct lang_identifier *) (NODE))->error_locus)
68 /* In identifiers, C uses the following fields in a special way:
69 TREE_PUBLIC to record that there was a previous local extern decl.
70 TREE_USED to record that such a decl was used.
71 TREE_ADDRESSABLE to record that the address of such a decl was used. */
73 /* Nonzero means reject anything that ANSI standard C forbids. */
76 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only. */
77 #define C_TYPE_FIELDS_READONLY(type) TREE_LANG_FLAG_1 (type)
79 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile. */
80 #define C_TYPE_FIELDS_VOLATILE(type) TREE_LANG_FLAG_2 (type)
82 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
83 nonzero if the definition of the type has already started. */
84 #define C_TYPE_BEING_DEFINED(type) TYPE_LANG_FLAG_0 (type)
86 /* In a RECORD_TYPE, a sorted array of the fields of the type. */
93 /* Mark which labels are explicitly declared.
94 These may be shadowed, and may be referenced from nested functions. */
95 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
97 /* Record whether a type or decl was written with nonconstant size.
98 Note that TYPE_SIZE may have simplified to a constant. */
99 #define C_TYPE_VARIABLE_SIZE(type) TYPE_LANG_FLAG_1 (type)
100 #define C_DECL_VARIABLE_SIZE(type) DECL_LANG_FLAG_0 (type)
102 #if 0 /* Not used. */
103 /* Record whether a decl for a function or function pointer has
104 already been mentioned (in a warning) because it was called
105 but didn't have a prototype. */
106 #define C_MISSING_PROTOTYPE_WARNED(decl) DECL_LANG_FLAG_2(decl)
109 /* Store a value in that field. */
110 #define C_SET_EXP_ORIGINAL_CODE(exp, code) \
111 (TREE_COMPLEXITY (exp) = (int) (code))
113 /* Record whether a typedef for type `int' was actually `signed int'. */
114 #define C_TYPEDEF_EXPLICITLY_SIGNED(exp) DECL_LANG_FLAG_1 ((exp))
116 /* Nonzero for a declaration of a built in function if there has been no
117 occasion that would declare the function in ordinary C.
118 Using the function draws a pedantic warning in this case. */
119 #define C_DECL_ANTICIPATED(exp) DECL_LANG_FLAG_3 ((exp))
121 /* For FUNCTION_TYPE, a hidden list of types of arguments. The same as
122 TYPE_ARG_TYPES for functions with prototypes, but created for functions
123 without prototypes. */
124 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_NONCOPIED_PARTS (NODE)
126 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield. */
127 #define DECL_C_BIT_FIELD(NODE) DECL_LANG_FLAG_4 (NODE)
130 /* in c-lang.c and objc-act.c */
131 extern tree lookup_interface PARAMS ((tree));
132 extern tree is_class_name PARAMS ((tree));
133 extern void maybe_objc_check_decl PARAMS ((tree));
134 extern void finish_file PARAMS ((void));
135 extern int maybe_objc_comptypes PARAMS ((tree, tree, int));
136 extern tree maybe_building_objc_message_expr PARAMS ((void));
137 extern tree maybe_objc_method_name PARAMS ((tree));
138 extern int recognize_objc_keyword PARAMS ((void));
139 extern tree lookup_objc_ivar PARAMS ((tree));
142 extern void c_parse_init PARAMS ((void));
144 /* in c-aux-info.c */
145 extern void gen_aux_info_record PARAMS ((tree, int, int, int));
148 extern tree convert PARAMS ((tree, tree));
151 extern tree build_enumerator PARAMS ((tree, tree));
153 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P) \
154 c_build_qualified_type (TYPE, \
155 ((CONST_P) ? TYPE_QUAL_CONST : 0) | \
156 ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
157 extern int c_decode_option PARAMS ((int, char **));
158 extern void c_mark_varargs PARAMS ((void));
159 extern tree check_identifier PARAMS ((tree, tree));
160 extern void clear_parm_order PARAMS ((void));
161 extern tree combine_parm_decls PARAMS ((tree, tree, int));
162 extern int complete_array_type PARAMS ((tree, tree, int));
163 extern void declare_parm_level PARAMS ((int));
164 extern tree define_label PARAMS ((const char *, int,
166 extern void delete_block PARAMS ((tree));
167 extern void finish_decl PARAMS ((tree, tree, tree));
168 extern void finish_decl_top_level PARAMS ((tree, tree, tree));
169 extern tree finish_enum PARAMS ((tree, tree, tree));
170 extern void finish_function PARAMS ((int));
171 extern tree finish_struct PARAMS ((tree, tree, tree));
172 extern tree get_parm_info PARAMS ((int));
173 extern tree getdecls PARAMS ((void));
174 extern tree gettags PARAMS ((void));
175 extern int global_bindings_p PARAMS ((void));
176 extern tree grokfield PARAMS ((const char *, int, tree, tree, tree));
177 extern tree groktypename PARAMS ((tree));
178 extern tree groktypename_in_parm_context PARAMS ((tree));
179 extern tree implicitly_declare PARAMS ((tree));
180 extern void implicit_decl_warning PARAMS ((tree));
181 extern int in_parm_level_p PARAMS ((void));
182 extern void init_decl_processing PARAMS ((void));
183 extern void insert_block PARAMS ((tree));
184 extern void keep_next_level PARAMS ((void));
185 extern int kept_level_p PARAMS ((void));
186 extern tree lookup_label PARAMS ((tree));
187 extern tree lookup_name PARAMS ((tree));
188 extern tree lookup_name_current_level PARAMS ((tree));
189 extern tree lookup_name_current_level_global PARAMS ((tree));
190 extern tree maybe_build_cleanup 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 tree poplevel PARAMS ((int, int, int));
198 extern void print_lang_decl PARAMS ((FILE *, tree, int));
199 extern void print_lang_identifier PARAMS ((FILE *, tree, int));
200 extern void print_lang_type PARAMS ((FILE *, tree, int));
201 extern void push_label_level PARAMS ((void));
202 extern void push_parm_decl PARAMS ((tree));
203 extern tree pushdecl PARAMS ((tree));
204 extern tree pushdecl_top_level PARAMS ((tree));
205 extern void pushlevel PARAMS ((int));
206 extern void pushtag PARAMS ((tree, tree));
207 extern void set_block PARAMS ((tree));
208 extern tree shadow_label PARAMS ((tree));
209 extern void shadow_record_fields PARAMS ((tree));
210 extern void shadow_tag PARAMS ((tree));
211 extern void shadow_tag_warned PARAMS ((tree, int));
212 extern tree start_enum PARAMS ((tree));
213 extern int start_function PARAMS ((tree, tree, tree,
215 extern tree start_decl PARAMS ((tree, tree, int,
217 extern tree start_struct PARAMS ((enum tree_code, tree));
218 extern void store_parm_decls PARAMS ((void));
219 extern tree xref_tag PARAMS ((enum tree_code, tree));
222 extern tree require_complete_type PARAMS ((tree));
223 extern void incomplete_type_error PARAMS ((tree, tree));
224 extern int comptypes PARAMS ((tree, tree));
225 extern tree c_sizeof PARAMS ((tree));
226 extern tree c_sizeof_nowarn PARAMS ((tree));
227 extern tree c_size_in_bytes PARAMS ((tree));
228 extern tree c_alignof PARAMS ((tree));
229 extern tree c_alignof_expr PARAMS ((tree));
230 extern tree build_component_ref PARAMS ((tree, tree));
231 extern tree build_indirect_ref PARAMS ((tree, const char *));
232 extern tree build_array_ref PARAMS ((tree, tree));
233 extern tree build_external_ref PARAMS ((tree, int));
234 extern tree build_function_call PARAMS ((tree, tree));
235 extern tree parser_build_binary_op PARAMS ((enum tree_code,
237 extern int lvalue_or_else PARAMS ((tree, const char *));
238 extern void readonly_warning PARAMS ((tree, const char *));
239 extern int mark_addressable PARAMS ((tree));
240 extern tree build_conditional_expr PARAMS ((tree, tree, tree));
241 extern tree build_compound_expr PARAMS ((tree));
242 extern tree build_c_cast PARAMS ((tree, tree));
243 extern tree build_modify_expr PARAMS ((tree, enum tree_code,
245 extern void store_init_value PARAMS ((tree, tree));
246 extern void error_init PARAMS ((const char *));
247 extern void pedwarn_init PARAMS ((const char *));
248 extern void start_init PARAMS ((tree, tree, int));
249 extern void finish_init PARAMS ((void));
250 extern void really_start_incremental_init PARAMS ((tree));
251 extern void push_init_level PARAMS ((int));
252 extern tree pop_init_level PARAMS ((int));
253 extern void set_init_index PARAMS ((tree, tree));
254 extern void set_init_label PARAMS ((tree));
255 extern void process_init_element PARAMS ((tree));
256 extern void pedwarn_c99 PARAMS ((const char *, ...))
259 /* Set to 0 at beginning of a function definition, set to 1 if
260 a return statement that specifies a return value is seen. */
262 extern int current_function_returns_value;
264 /* Set to 0 at beginning of a function definition, set to 1 if
265 a return statement with no argument is seen. */
267 extern int current_function_returns_null;
269 /* Nonzero means the expression being parsed will never be evaluated.
270 This is a count, since unevaluated expressions can nest. */
272 extern int skip_evaluation;
274 /* Nonzero means `$' can be in an identifier. */
276 extern int dollars_in_ident;
278 /* Nonzero means allow type mismatches in conditional expressions;
279 just make their values `void'. */
281 extern int flag_cond_mismatch;
283 /* Nonzero means don't recognize the keyword `asm'. */
285 extern int flag_no_asm;
287 /* Nonzero means warn about implicit declarations. */
289 extern int warn_implicit;
291 /* Nonzero means warn about sizeof (function) or addition/subtraction
292 of function pointers. */
294 extern int warn_pointer_arith;
296 /* Nonzero means warn for all old-style non-prototype function decls. */
298 extern int warn_strict_prototypes;
300 /* Nonzero means warn about multiple (redundant) decls for the same single
301 variable or function. */
303 extern int warn_redundant_decls;
305 /* Nonzero means warn about extern declarations of objects not at
306 file-scope level and about *all* declarations of functions (whether
307 extern or static) not at file-scope level. Note that we exclude
308 implicit function declarations. To get warnings about those, use
311 extern int warn_nested_externs;
313 /* Nonzero means warn about pointer casts that can drop a type qualifier
314 from the pointer target type. */
316 extern int warn_cast_qual;
318 /* Nonzero means warn when casting a function call to a type that does
319 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
320 when there is no previous declaration of sqrt or malloc. */
322 extern int warn_bad_function_cast;
324 /* Warn about functions which might be candidates for attribute noreturn. */
326 extern int warn_missing_noreturn;
328 /* Warn about traditional constructs whose meanings changed in ANSI C. */
330 extern int warn_traditional;
332 /* Warn about a subscript that has type char. */
334 extern int warn_char_subscripts;
336 /* Warn if main is suspicious. */
338 extern int warn_main;
340 /* Nonzero means to allow single precision math even if we're generally
341 being traditional. */
342 extern int flag_allow_single_precision;
344 /* Warn if initializer is not completely bracketed. */
346 extern int warn_missing_braces;
348 /* Warn about comparison of signed and unsigned values. */
350 extern int warn_sign_compare;
352 /* Warn about testing equality of floating point numbers. */
354 extern int warn_float_equal;
356 /* Warn about multicharacter constants. */
358 extern int warn_multichar;
360 /* Warn about long long. */
362 extern int warn_long_long;
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;
371 /* Nonzero enables objc features. */
373 #define doing_objc_thang \
374 (c_language == clk_objective_c)
377 extern void finish_incomplete_decl PARAMS ((tree));
379 #endif /* not _C_TREE_H */