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 tree_identifier ignore;
40 tree global_value, local_value, label_value, implicit_decl;
41 tree error_locus, limbo_value;
45 /* Macros for access to language-specific slots in an identifier. */
46 /* Each of these slots contains a DECL node or null. */
48 /* This represents the value which the identifier has in the
49 file-scope namespace. */
50 #define IDENTIFIER_GLOBAL_VALUE(NODE) \
51 (((struct lang_identifier *) (NODE))->global_value)
52 /* This represents the value which the identifier has in the current
54 #define IDENTIFIER_LOCAL_VALUE(NODE) \
55 (((struct lang_identifier *) (NODE))->local_value)
56 /* This represents the value which the identifier has as a label in
57 the current label scope. */
58 #define IDENTIFIER_LABEL_VALUE(NODE) \
59 (((struct lang_identifier *) (NODE))->label_value)
60 /* This records the extern decl of this identifier, if it has had one
61 at any point in this compilation. */
62 #define IDENTIFIER_LIMBO_VALUE(NODE) \
63 (((struct lang_identifier *) (NODE))->limbo_value)
64 /* This records the implicit function decl of this identifier, if it
65 has had one at any point in this compilation. */
66 #define IDENTIFIER_IMPLICIT_DECL(NODE) \
67 (((struct lang_identifier *) (NODE))->implicit_decl)
68 /* This is the last function in which we printed an "undefined variable"
69 message for this identifier. Value is a FUNCTION_DECL or null. */
70 #define IDENTIFIER_ERROR_LOCUS(NODE) \
71 (((struct lang_identifier *) (NODE))->error_locus)
73 /* In identifiers, C uses the following fields in a special way:
74 TREE_PUBLIC to record that there was a previous local extern decl.
75 TREE_USED to record that such a decl was used.
76 TREE_ADDRESSABLE to record that the address of such a decl was used. */
78 /* Nonzero means reject anything that ANSI standard C forbids. */
81 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only. */
82 #define C_TYPE_FIELDS_READONLY(type) TREE_LANG_FLAG_1 (type)
84 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile. */
85 #define C_TYPE_FIELDS_VOLATILE(type) TREE_LANG_FLAG_2 (type)
87 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
88 nonzero if the definition of the type has already started. */
89 #define C_TYPE_BEING_DEFINED(type) TYPE_LANG_FLAG_0 (type)
91 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
92 keyword. C_RID_CODE (node) is then the RID_* value of the keyword,
93 and C_RID_YYCODE is the token number wanted by Yacc. */
95 #define C_IS_RESERVED_WORD(id) TREE_LANG_FLAG_0 (id)
96 #define C_RID_CODE(id) \
97 (((struct lang_identifier *) (id))->rid_code)
99 /* In a RECORD_TYPE, a sorted array of the fields of the type. */
106 /* Mark which labels are explicitly declared.
107 These may be shadowed, and may be referenced from nested functions. */
108 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
110 /* Record whether a type or decl was written with nonconstant size.
111 Note that TYPE_SIZE may have simplified to a constant. */
112 #define C_TYPE_VARIABLE_SIZE(type) TYPE_LANG_FLAG_1 (type)
113 #define C_DECL_VARIABLE_SIZE(type) DECL_LANG_FLAG_0 (type)
115 #if 0 /* Not used. */
116 /* Record whether a decl for a function or function pointer has
117 already been mentioned (in a warning) because it was called
118 but didn't have a prototype. */
119 #define C_MISSING_PROTOTYPE_WARNED(decl) DECL_LANG_FLAG_2(decl)
122 /* Store a value in that field. */
123 #define C_SET_EXP_ORIGINAL_CODE(exp, code) \
124 (TREE_COMPLEXITY (exp) = (int) (code))
126 /* Record whether a typedef for type `int' was actually `signed int'. */
127 #define C_TYPEDEF_EXPLICITLY_SIGNED(exp) DECL_LANG_FLAG_1 ((exp))
129 /* Nonzero for a declaration of a built in function if there has been no
130 occasion that would declare the function in ordinary C.
131 Using the function draws a pedantic warning in this case. */
132 #define C_DECL_ANTICIPATED(exp) DECL_LANG_FLAG_3 ((exp))
134 /* For FUNCTION_TYPE, a hidden list of types of arguments. The same as
135 TYPE_ARG_TYPES for functions with prototypes, but created for functions
136 without prototypes. */
137 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_NONCOPIED_PARTS (NODE)
139 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield. */
140 #define DECL_C_BIT_FIELD(NODE) DECL_LANG_FLAG_4 (NODE)
143 /* in c-lang.c and objc-act.c */
144 extern tree lookup_interface PARAMS ((tree));
145 extern tree is_class_name PARAMS ((tree));
146 extern void maybe_objc_check_decl PARAMS ((tree));
147 extern void finish_file PARAMS ((void));
148 extern int maybe_objc_comptypes PARAMS ((tree, tree, int));
149 extern tree maybe_building_objc_message_expr PARAMS ((void));
150 extern tree maybe_objc_method_name PARAMS ((tree));
151 extern int recognize_objc_keyword PARAMS ((void));
152 extern tree lookup_objc_ivar PARAMS ((tree));
155 extern void c_parse_init PARAMS ((void));
157 /* in c-aux-info.c */
158 extern void gen_aux_info_record PARAMS ((tree, int, int, int));
161 extern tree convert PARAMS ((tree, tree));
164 extern tree build_enumerator PARAMS ((tree, tree));
166 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P) \
167 c_build_qualified_type (TYPE, \
168 ((CONST_P) ? TYPE_QUAL_CONST : 0) | \
169 ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
170 extern int c_decode_option PARAMS ((int, char **));
171 extern void c_mark_varargs PARAMS ((void));
172 extern tree check_identifier PARAMS ((tree, tree));
173 extern void clear_parm_order PARAMS ((void));
174 extern tree combine_parm_decls PARAMS ((tree, tree, int));
175 extern int complete_array_type PARAMS ((tree, tree, int));
176 extern void declare_parm_level PARAMS ((int));
177 extern tree define_label PARAMS ((const char *, int,
179 extern void delete_block PARAMS ((tree));
180 extern void finish_decl PARAMS ((tree, tree, tree));
181 extern void finish_decl_top_level PARAMS ((tree, tree, tree));
182 extern tree finish_enum PARAMS ((tree, tree, tree));
183 extern void finish_function PARAMS ((int));
184 extern tree finish_struct PARAMS ((tree, tree, tree));
185 extern tree get_parm_info PARAMS ((int));
186 extern tree getdecls PARAMS ((void));
187 extern tree gettags PARAMS ((void));
188 extern int global_bindings_p PARAMS ((void));
189 extern tree grokfield PARAMS ((const char *, int, tree, tree, tree));
190 extern tree groktypename PARAMS ((tree));
191 extern tree groktypename_in_parm_context PARAMS ((tree));
192 extern tree implicitly_declare PARAMS ((tree));
193 extern void implicit_decl_warning PARAMS ((tree));
194 extern int in_parm_level_p PARAMS ((void));
195 extern void init_decl_processing PARAMS ((void));
196 extern void insert_block PARAMS ((tree));
197 extern void keep_next_level PARAMS ((void));
198 extern int kept_level_p PARAMS ((void));
199 extern tree lookup_label PARAMS ((tree));
200 extern tree lookup_name PARAMS ((tree));
201 extern tree lookup_name_current_level PARAMS ((tree));
202 extern tree lookup_name_current_level_global PARAMS ((tree));
203 extern tree maybe_build_cleanup PARAMS ((tree));
204 extern void parmlist_tags_warning PARAMS ((void));
205 extern void pending_xref_error PARAMS ((void));
206 extern void mark_c_function_context PARAMS ((struct function *));
207 extern void push_c_function_context PARAMS ((struct function *));
208 extern void pop_c_function_context PARAMS ((struct function *));
209 extern void pop_label_level PARAMS ((void));
210 extern tree poplevel PARAMS ((int, int, int));
211 extern void print_lang_decl PARAMS ((FILE *, tree, int));
212 extern void print_lang_identifier PARAMS ((FILE *, tree, int));
213 extern void print_lang_type PARAMS ((FILE *, tree, int));
214 extern void push_label_level PARAMS ((void));
215 extern void push_parm_decl PARAMS ((tree));
216 extern tree pushdecl PARAMS ((tree));
217 extern tree pushdecl_top_level PARAMS ((tree));
218 extern void pushlevel PARAMS ((int));
219 extern void pushtag PARAMS ((tree, tree));
220 extern void set_block PARAMS ((tree));
221 extern tree shadow_label PARAMS ((tree));
222 extern void shadow_record_fields PARAMS ((tree));
223 extern void shadow_tag PARAMS ((tree));
224 extern void shadow_tag_warned PARAMS ((tree, int));
225 extern tree start_enum PARAMS ((tree));
226 extern int start_function PARAMS ((tree, tree, tree,
228 extern tree start_decl PARAMS ((tree, tree, int,
230 extern tree start_struct PARAMS ((enum tree_code, tree));
231 extern void store_parm_decls PARAMS ((void));
232 extern tree xref_tag PARAMS ((enum tree_code, tree));
235 extern tree require_complete_type PARAMS ((tree));
236 extern void incomplete_type_error PARAMS ((tree, tree));
237 extern int comptypes PARAMS ((tree, tree));
238 extern tree c_sizeof PARAMS ((tree));
239 extern tree c_sizeof_nowarn PARAMS ((tree));
240 extern tree c_size_in_bytes PARAMS ((tree));
241 extern tree c_alignof PARAMS ((tree));
242 extern tree c_alignof_expr PARAMS ((tree));
243 extern tree build_component_ref PARAMS ((tree, tree));
244 extern tree build_indirect_ref PARAMS ((tree, const char *));
245 extern tree build_array_ref PARAMS ((tree, tree));
246 extern tree build_external_ref PARAMS ((tree, int));
247 extern tree build_function_call PARAMS ((tree, tree));
248 extern tree parser_build_binary_op PARAMS ((enum tree_code,
250 extern int lvalue_or_else PARAMS ((tree, const char *));
251 extern void readonly_warning PARAMS ((tree, const char *));
252 extern int mark_addressable PARAMS ((tree));
253 extern tree build_conditional_expr PARAMS ((tree, tree, tree));
254 extern tree build_compound_expr PARAMS ((tree));
255 extern tree build_c_cast PARAMS ((tree, tree));
256 extern tree build_modify_expr PARAMS ((tree, enum tree_code,
258 extern void store_init_value PARAMS ((tree, tree));
259 extern void error_init PARAMS ((const char *));
260 extern void pedwarn_init PARAMS ((const char *));
261 extern void start_init PARAMS ((tree, tree, int));
262 extern void finish_init PARAMS ((void));
263 extern void really_start_incremental_init PARAMS ((tree));
264 extern void push_init_level PARAMS ((int));
265 extern tree pop_init_level PARAMS ((int));
266 extern void set_init_index PARAMS ((tree, tree));
267 extern void set_init_label PARAMS ((tree));
268 extern void process_init_element PARAMS ((tree));
269 extern void pedwarn_c99 PARAMS ((const char *, ...))
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 about sizeof (function) or addition/subtraction
305 of function pointers. */
307 extern int warn_pointer_arith;
309 /* Nonzero means warn for all old-style non-prototype function decls. */
311 extern int warn_strict_prototypes;
313 /* Nonzero means warn about multiple (redundant) decls for the same single
314 variable or function. */
316 extern int warn_redundant_decls;
318 /* Nonzero means warn about extern declarations of objects not at
319 file-scope level and about *all* declarations of functions (whether
320 extern or static) not at file-scope level. Note that we exclude
321 implicit function declarations. To get warnings about those, use
324 extern int warn_nested_externs;
326 /* Nonzero means warn about pointer casts that can drop a type qualifier
327 from the pointer target type. */
329 extern int warn_cast_qual;
331 /* Nonzero means warn when casting a function call to a type that does
332 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
333 when there is no previous declaration of sqrt or malloc. */
335 extern int warn_bad_function_cast;
337 /* Warn about functions which might be candidates for attribute noreturn. */
339 extern int warn_missing_noreturn;
341 /* Warn about traditional constructs whose meanings changed in ANSI C. */
343 extern int warn_traditional;
345 /* Warn about a subscript that has type char. */
347 extern int warn_char_subscripts;
349 /* Warn if main is suspicious. */
351 extern int warn_main;
353 /* Nonzero means to allow single precision math even if we're generally
354 being traditional. */
355 extern int flag_allow_single_precision;
357 /* Warn if initializer is not completely bracketed. */
359 extern int warn_missing_braces;
361 /* Warn about comparison of signed and unsigned values. */
363 extern int warn_sign_compare;
365 /* Warn about testing equality of floating point numbers. */
367 extern int warn_float_equal;
369 /* Warn about multicharacter constants. */
371 extern int warn_multichar;
373 /* Warn about long long. */
375 extern int warn_long_long;
377 /* Nonzero means we are reading code that came from a system header file. */
379 extern int system_header_p;
381 /* Warn about implicit declarations. 1 = warning, 2 = error. */
382 extern int mesg_implicit_function_declaration;
384 /* Nonzero enables objc features. */
386 #define doing_objc_thang \
387 (c_language == clk_objective_c)
390 extern void finish_incomplete_decl PARAMS ((tree));
392 #endif /* not _C_TREE_H */