1 /* Definitions for C parsing and type checking.
2 Copyright (C) 1987, 93, 94, 95, 97, 98, 1999 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
26 /* Language-dependent contents of an identifier. */
28 /* The limbo_value is used for block level extern declarations, which need
29 to be type checked against subsequent extern declarations. They can't
30 be referenced after they fall out of scope, so they can't be global. */
32 struct lang_identifier
34 struct tree_identifier ignore;
35 tree global_value, local_value, label_value, implicit_decl;
36 tree error_locus, limbo_value;
39 /* Macros for access to language-specific slots in an identifier. */
40 /* Each of these slots contains a DECL node or null. */
42 /* This represents the value which the identifier has in the
43 file-scope namespace. */
44 #define IDENTIFIER_GLOBAL_VALUE(NODE) \
45 (((struct lang_identifier *) (NODE))->global_value)
46 /* This represents the value which the identifier has in the current
48 #define IDENTIFIER_LOCAL_VALUE(NODE) \
49 (((struct lang_identifier *) (NODE))->local_value)
50 /* This represents the value which the identifier has as a label in
51 the current label scope. */
52 #define IDENTIFIER_LABEL_VALUE(NODE) \
53 (((struct lang_identifier *) (NODE))->label_value)
54 /* This records the extern decl of this identifier, if it has had one
55 at any point in this compilation. */
56 #define IDENTIFIER_LIMBO_VALUE(NODE) \
57 (((struct lang_identifier *) (NODE))->limbo_value)
58 /* This records the implicit function decl of this identifier, if it
59 has had one at any point in this compilation. */
60 #define IDENTIFIER_IMPLICIT_DECL(NODE) \
61 (((struct lang_identifier *) (NODE))->implicit_decl)
62 /* This is the last function in which we printed an "undefined variable"
63 message for this identifier. Value is a FUNCTION_DECL or null. */
64 #define IDENTIFIER_ERROR_LOCUS(NODE) \
65 (((struct lang_identifier *) (NODE))->error_locus)
67 /* In identifiers, C uses the following fields in a special way:
68 TREE_PUBLIC to record that there was a previous local extern decl.
69 TREE_USED to record that such a decl was used.
70 TREE_ADDRESSABLE to record that the address of such a decl was used. */
72 /* Nonzero means reject anything that ANSI standard C forbids. */
75 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only. */
76 #define C_TYPE_FIELDS_READONLY(type) TREE_LANG_FLAG_1 (type)
78 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile. */
79 #define C_TYPE_FIELDS_VOLATILE(type) TREE_LANG_FLAG_2 (type)
81 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
82 nonzero if the definition of the type has already started. */
83 #define C_TYPE_BEING_DEFINED(type) TYPE_LANG_FLAG_0 (type)
85 /* C types are partitioned into three subsets: object, function, and
87 #define C_TYPE_OBJECT_P(type) \
88 (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
90 #define C_TYPE_FUNCTION_P(type) \
91 (TREE_CODE (type) == FUNCTION_TYPE)
93 #define C_TYPE_INCOMPLETE_P(type) \
94 (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
96 /* For convenience we define a single macro to identify the class of
97 object or incomplete types. */
98 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
99 (!C_TYPE_FUNCTION_P (type))
101 /* In a RECORD_TYPE, a sorted array of the fields of the type. */
108 /* Mark which labels are explicitly declared.
109 These may be shadowed, and may be referenced from nested functions. */
110 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
112 /* Record whether a type or decl was written with nonconstant size.
113 Note that TYPE_SIZE may have simplified to a constant. */
114 #define C_TYPE_VARIABLE_SIZE(type) TYPE_LANG_FLAG_1 (type)
115 #define C_DECL_VARIABLE_SIZE(type) DECL_LANG_FLAG_0 (type)
117 /* Record in each node resulting from a binary operator
118 what operator was specified for it. */
119 #define C_EXP_ORIGINAL_CODE(exp) ((enum tree_code) TREE_COMPLEXITY (exp))
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_NONCOPIED_PARTS (NODE)
145 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield. */
146 #define DECL_C_BIT_FIELD(NODE) DECL_LANG_FLAG_4 (NODE)
148 /* Nonzero if the type T promotes to itself.
149 ANSI C states explicitly the list of types that promote;
150 in particular, short promotes to int even if they have the same width. */
151 #define C_PROMOTING_INTEGER_TYPE_P(t) \
152 (TREE_CODE ((t)) == INTEGER_TYPE \
153 && (TYPE_MAIN_VARIANT (t) == char_type_node \
154 || TYPE_MAIN_VARIANT (t) == signed_char_type_node \
155 || TYPE_MAIN_VARIANT (t) == unsigned_char_type_node \
156 || TYPE_MAIN_VARIANT (t) == short_integer_type_node \
157 || TYPE_MAIN_VARIANT (t) == short_unsigned_type_node))
159 /* In a VAR_DECL, means the variable is really an iterator. */
160 #define ITERATOR_P(D) (DECL_LANG_FLAG_4(D))
162 /* In a VAR_DECL for an iterator, means we are within
163 an explicit loop over that iterator. */
164 #define ITERATOR_BOUND_P(NODE) ((NODE)->common.readonly_flag)
166 /* in c-lang.c and objc-act.c */
167 extern tree lookup_interface PROTO((tree));
168 extern tree is_class_name PROTO((tree));
169 extern void maybe_objc_check_decl PROTO((tree));
170 extern void finish_file PROTO((void));
171 extern int maybe_objc_comptypes PROTO((tree, tree, int));
172 extern tree maybe_building_objc_message_expr PROTO((void));
173 extern tree maybe_objc_method_name PROTO((tree));
174 extern int recognize_objc_keyword PROTO((void));
175 extern tree build_objc_string PROTO((int, const char *));
178 extern void c_parse_init PROTO((void));
180 /* in c-aux-info.c */
181 extern void gen_aux_info_record PROTO((tree, int, int, int));
184 extern tree convert PROTO((tree, tree));
187 extern tree build_enumerator PROTO((tree, tree));
188 /* Add qualifiers to a type, in the fashion for C. */
189 extern tree c_build_qualified_type PROTO((tree, int));
190 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P) \
191 c_build_qualified_type (TYPE, \
192 ((CONST_P) ? TYPE_QUAL_CONST : 0) | \
193 ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
194 extern int c_decode_option PROTO((int, char **));
195 extern void c_mark_varargs PROTO((void));
196 extern tree check_identifier PROTO((tree, tree));
197 extern void clear_parm_order PROTO((void));
198 extern tree combine_parm_decls PROTO((tree, tree, int));
199 extern int complete_array_type PROTO((tree, tree, int));
200 extern void declare_parm_level PROTO((int));
201 extern tree define_label PROTO((char *, int, tree));
202 extern void delete_block PROTO((tree));
203 extern void finish_decl PROTO((tree, tree, tree));
204 extern void finish_decl_top_level PROTO((tree, tree, tree));
205 extern tree finish_enum PROTO((tree, tree, tree));
206 extern void finish_function PROTO((int));
207 extern tree finish_struct PROTO((tree, tree, tree));
208 extern tree get_parm_info PROTO((int));
209 extern tree getdecls PROTO((void));
210 extern tree gettags PROTO((void));
211 extern int global_bindings_p PROTO((void));
212 extern tree grokfield PROTO((const char *, int, tree, tree, tree));
213 extern tree groktypename PROTO((tree));
214 extern tree groktypename_in_parm_context PROTO((tree));
215 extern tree implicitly_declare PROTO((tree));
216 extern int in_parm_level_p PROTO((void));
217 extern void init_decl_processing PROTO((void));
218 extern void insert_block PROTO((tree));
219 extern void keep_next_level PROTO((void));
220 extern int kept_level_p PROTO((void));
221 extern tree lookup_label PROTO((tree));
222 extern tree lookup_name PROTO((tree));
223 extern tree lookup_name_current_level PROTO((tree));
224 extern tree lookup_name_current_level_global PROTO((tree));
225 extern tree maybe_build_cleanup PROTO((tree));
226 extern void parmlist_tags_warning PROTO((void));
227 extern void pending_xref_error PROTO((void));
228 extern void mark_c_function_context PROTO((struct function *));
229 extern void push_c_function_context PROTO((struct function *));
230 extern void pop_c_function_context PROTO((struct function *));
231 extern void pop_label_level PROTO((void));
232 extern tree poplevel PROTO((int, int, int));
233 extern void print_lang_decl PROTO((FILE *, tree, int));
234 extern void print_lang_identifier PROTO((FILE *, tree, int));
235 extern void print_lang_type PROTO((FILE *, tree, int));
236 extern void push_label_level PROTO((void));
237 extern void push_parm_decl PROTO((tree));
238 extern tree pushdecl PROTO((tree));
239 extern tree pushdecl_top_level PROTO((tree));
240 extern void pushlevel PROTO((int));
241 extern void pushtag PROTO((tree, tree));
242 extern void set_block PROTO((tree));
243 extern tree shadow_label PROTO((tree));
244 extern void shadow_record_fields PROTO((tree));
245 extern void shadow_tag PROTO((tree));
246 extern void shadow_tag_warned PROTO((tree, int));
247 extern tree start_enum PROTO((tree));
248 extern int start_function PROTO((tree, tree, tree,
250 extern tree start_decl PROTO((tree, tree, int,
252 extern tree start_struct PROTO((enum tree_code, tree));
253 extern void store_parm_decls PROTO((void));
254 extern tree xref_tag PROTO((enum tree_code, tree));
257 extern tree require_complete_type PROTO((tree));
258 extern void incomplete_type_error PROTO((tree, tree));
259 /* Given two integer or real types, return the type for their sum.
260 Given two compatible ANSI C types, returns the merged type. */
261 extern tree common_type PROTO((tree, tree));
262 extern int comptypes PROTO((tree, tree));
263 extern int self_promoting_args_p PROTO((tree));
264 extern tree c_sizeof PROTO((tree));
265 extern tree c_sizeof_nowarn PROTO((tree));
266 extern tree c_size_in_bytes PROTO((tree));
267 extern tree c_alignof PROTO((tree));
268 extern tree c_alignof_expr PROTO((tree));
269 extern tree default_conversion PROTO((tree));
270 extern tree build_component_ref PROTO((tree, tree));
271 extern tree build_indirect_ref PROTO((tree, const char *));
272 extern tree build_array_ref PROTO((tree, tree));
273 extern tree build_function_call PROTO((tree, tree));
274 extern tree parser_build_binary_op PROTO((enum tree_code,
276 extern tree build_binary_op PROTO((enum tree_code,
278 extern tree build_unary_op PROTO((enum tree_code,
280 extern int lvalue_p PROTO((tree));
281 extern int lvalue_or_else PROTO((tree, const char *));
282 extern void readonly_warning PROTO((tree, const char *));
283 extern int mark_addressable PROTO((tree));
284 extern tree build_conditional_expr PROTO((tree, tree, tree));
285 extern tree build_compound_expr PROTO((tree));
286 extern tree build_c_cast PROTO((tree, tree));
287 extern tree build_modify_expr PROTO((tree, enum tree_code,
289 extern void store_init_value PROTO((tree, tree));
290 extern void error_init PROTO((const char *));
291 extern void pedwarn_init PROTO((const char *));
292 extern void start_init PROTO((tree, tree, int));
293 extern void finish_init PROTO((void));
294 extern void really_start_incremental_init PROTO((tree));
295 extern void push_init_level PROTO((int));
296 extern tree pop_init_level PROTO((int));
297 extern void set_init_index PROTO((tree, tree));
298 extern void set_init_label PROTO((tree));
299 extern void process_init_element PROTO((tree));
300 extern void c_expand_asm_operands PROTO((tree, tree, tree, tree,
302 extern void c_expand_return PROTO((tree));
303 extern tree c_expand_start_case PROTO((tree));
306 extern void init_iterators PROTO((void));
307 extern void iterator_expand PROTO((tree));
308 extern void iterator_for_loop_start PROTO((tree));
309 extern void iterator_for_loop_end PROTO((tree));
310 extern void iterator_for_loop_record PROTO((tree));
311 extern void push_iterator_stack PROTO((void));
312 extern void pop_iterator_stack PROTO((void));
314 /* Set to 0 at beginning of a function definition, set to 1 if
315 a return statement that specifies a return value is seen. */
317 extern int current_function_returns_value;
319 /* Set to 0 at beginning of a function definition, set to 1 if
320 a return statement with no argument is seen. */
322 extern int current_function_returns_null;
324 /* Nonzero means the expression being parsed will never be evaluated.
325 This is a count, since unevaluated expressions can nest. */
327 extern int skip_evaluation;
329 /* Nonzero means `$' can be in an identifier. */
331 extern int dollars_in_ident;
333 /* Nonzero means allow type mismatches in conditional expressions;
334 just make their values `void'. */
336 extern int flag_cond_mismatch;
338 /* Nonzero means don't recognize the keyword `asm'. */
340 extern int flag_no_asm;
342 /* Nonzero means environment is hosted (i.e., not freestanding) */
344 extern int flag_hosted;
346 /* Nonzero means warn about implicit declarations. */
348 extern int warn_implicit;
350 /* Nonzero means give string constants the type `const char *'
351 to get extra warnings from them. These warnings will be too numerous
352 to be useful, except in thoroughly ANSIfied programs. */
354 extern int flag_const_strings;
356 /* Nonzero means warn about sizeof (function) or addition/subtraction
357 of function pointers. */
359 extern int warn_pointer_arith;
361 /* Nonzero means warn for all old-style non-prototype function decls. */
363 extern int warn_strict_prototypes;
365 /* Nonzero means warn about multiple (redundant) decls for the same single
366 variable or function. */
368 extern int warn_redundant_decls;
370 /* Nonzero means warn about extern declarations of objects not at
371 file-scope level and about *all* declarations of functions (whether
372 extern or static) not at file-scope level. Note that we exclude
373 implicit function declarations. To get warnings about those, use
376 extern int warn_nested_externs;
378 /* Nonzero means warn about pointer casts that can drop a type qualifier
379 from the pointer target type. */
381 extern int warn_cast_qual;
383 /* Nonzero means warn when casting a function call to a type that does
384 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
385 when there is no previous declaration of sqrt or malloc. */
387 extern int warn_bad_function_cast;
389 /* Warn about functions which might be candidates for attribute noreturn. */
391 extern int warn_missing_noreturn;
393 /* Warn about traditional constructs whose meanings changed in ANSI C. */
395 extern int warn_traditional;
397 /* Warn about *printf or *scanf format/argument anomalies. */
399 extern int warn_format;
401 /* Warn about a subscript that has type char. */
403 extern int warn_char_subscripts;
405 /* Warn if a type conversion is done that might have confusing results. */
407 extern int warn_conversion;
409 /* Warn if main is suspicious. */
411 extern int warn_main;
413 /* Nonzero means do some things the same way PCC does. */
415 extern int flag_traditional;
417 /* Nonzero means use the ISO C9x dialect of C. */
419 extern int flag_isoc9x;
421 /* Nonzero means to allow single precision math even if we're generally
422 being traditional. */
423 extern int flag_allow_single_precision;
425 /* Nonzero means warn about suggesting putting in ()'s. */
427 extern int warn_parentheses;
429 /* Warn if initializer is not completely bracketed. */
431 extern int warn_missing_braces;
433 /* Warn about comparison of signed and unsigned values. */
435 extern int warn_sign_compare;
437 /* Warn about multicharacter constants. */
439 extern int warn_multichar;
441 /* Warn about long long. */
443 extern int warn_long_long;
445 /* Nonzero means we are reading code that came from a system header file. */
447 extern int system_header_p;
449 /* Nonzero enables objc features. */
451 extern int doing_objc_thang;
454 extern void finish_incomplete_decl PROTO((tree));
456 #endif /* not _C_TREE_H */