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 /* 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. */
102 #define C_IS_RESERVED_WORD(id) TREE_LANG_FLAG_0 (id)
104 /* In a RECORD_TYPE, a sorted array of the fields of the type. */
111 /* Record whether a type or decl was written with nonconstant size.
112 Note that TYPE_SIZE may have simplified to a constant. */
113 #define C_TYPE_VARIABLE_SIZE(type) TYPE_LANG_FLAG_1 (type)
114 #define C_DECL_VARIABLE_SIZE(type) DECL_LANG_FLAG_0 (type)
116 #if 0 /* Not used. */
117 /* Record whether a decl for a function or function pointer has
118 already been mentioned (in a warning) because it was called
119 but didn't have a prototype. */
120 #define C_MISSING_PROTOTYPE_WARNED(decl) DECL_LANG_FLAG_2(decl)
123 /* Store a value in that field. */
124 #define C_SET_EXP_ORIGINAL_CODE(exp, code) \
125 (TREE_COMPLEXITY (exp) = (int) (code))
127 /* Record whether a typedef for type `int' was actually `signed int'. */
128 #define C_TYPEDEF_EXPLICITLY_SIGNED(exp) DECL_LANG_FLAG_1 ((exp))
130 /* Nonzero for a declaration of a built in function if there has been no
131 occasion that would declare the function in ordinary C.
132 Using the function draws a pedantic warning in this case. */
133 #define C_DECL_ANTICIPATED(exp) DECL_LANG_FLAG_3 ((exp))
135 /* For FUNCTION_TYPE, a hidden list of types of arguments. The same as
136 TYPE_ARG_TYPES for functions with prototypes, but created for functions
137 without prototypes. */
138 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_NONCOPIED_PARTS (NODE)
141 /* in c-lang.c and objc-act.c */
142 extern tree lookup_interface
PARAMS ((tree
));
143 extern tree is_class_name
PARAMS ((tree
));
144 extern void maybe_objc_check_decl
PARAMS ((tree
));
145 extern void finish_file
PARAMS ((void));
146 extern int maybe_objc_comptypes
PARAMS ((tree
, tree
, int));
147 extern tree maybe_building_objc_message_expr
PARAMS ((void));
148 extern int recognize_objc_keyword
PARAMS ((void));
149 extern tree lookup_objc_ivar
PARAMS ((tree
));
152 extern void c_parse_init
PARAMS ((void));
153 extern int yyparse_1
PARAMS ((void));
155 /* in c-aux-info.c */
156 extern void gen_aux_info_record
PARAMS ((tree
, int, int, int));
159 extern tree build_array_declarator
PARAMS ((tree
, tree
, int, int));
160 extern tree build_enumerator
PARAMS ((tree
, tree
));
162 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P) \
163 c_build_qualified_type (TYPE, \
164 ((CONST_P) ? TYPE_QUAL_CONST : 0) | \
165 ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
166 extern int c_decode_option
PARAMS ((int, char **));
167 extern void c_mark_varargs
PARAMS ((void));
168 extern void check_for_loop_decls
PARAMS ((void));
169 extern tree check_identifier
PARAMS ((tree
, tree
));
170 extern void clear_parm_order
PARAMS ((void));
171 extern tree combine_parm_decls
PARAMS ((tree
, tree
, int));
172 extern int complete_array_type
PARAMS ((tree
, tree
, int));
173 extern void declare_parm_level
PARAMS ((int));
174 extern tree define_label
PARAMS ((const char *, int,
176 extern void delete_block
PARAMS ((tree
));
177 extern void finish_decl
PARAMS ((tree
, tree
, tree
));
178 extern void finish_decl_top_level
PARAMS ((tree
, tree
, tree
));
179 extern tree finish_enum
PARAMS ((tree
, tree
, tree
));
180 extern void finish_function
PARAMS ((int));
181 extern tree finish_struct
PARAMS ((tree
, tree
, tree
));
182 extern tree get_parm_info
PARAMS ((int));
183 extern tree grokfield
PARAMS ((const char *, int, tree
, tree
, tree
));
184 extern tree groktypename
PARAMS ((tree
));
185 extern tree groktypename_in_parm_context
PARAMS ((tree
));
186 extern tree implicitly_declare
PARAMS ((tree
));
187 extern void implicit_decl_warning
PARAMS ((tree
));
188 extern int in_parm_level_p
PARAMS ((void));
189 extern void keep_next_level
PARAMS ((void));
190 extern int kept_level_p
PARAMS ((void));
191 extern tree lookup_name
PARAMS ((tree
));
192 extern tree lookup_name_current_level
PARAMS ((tree
));
193 extern tree lookup_name_current_level_global
PARAMS ((tree
));
194 extern void parmlist_tags_warning
PARAMS ((void));
195 extern void pending_xref_error
PARAMS ((void));
196 extern void mark_c_function_context
PARAMS ((struct function
*));
197 extern void push_c_function_context
PARAMS ((struct function
*));
198 extern void pop_c_function_context
PARAMS ((struct function
*));
199 extern void pop_label_level
PARAMS ((void));
200 extern void push_label_level
PARAMS ((void));
201 extern void push_parm_decl
PARAMS ((tree
));
202 extern tree pushdecl_top_level
PARAMS ((tree
));
203 extern void pushtag
PARAMS ((tree
, tree
));
204 extern tree set_array_declarator_type
PARAMS ((tree
, tree
, int));
205 extern tree shadow_label
PARAMS ((tree
));
206 extern void shadow_record_fields
PARAMS ((tree
));
207 extern void shadow_tag
PARAMS ((tree
));
208 extern void shadow_tag_warned
PARAMS ((tree
, int));
209 extern tree start_enum
PARAMS ((tree
));
210 extern int start_function
PARAMS ((tree
, tree
, tree
));
211 extern tree start_decl
PARAMS ((tree
, tree
, int,
213 extern tree start_struct
PARAMS ((enum tree_code
, tree
));
214 extern void store_parm_decls
PARAMS ((void));
215 extern tree xref_tag
PARAMS ((enum tree_code
, tree
));
216 extern tree c_begin_compound_stmt
PARAMS ((void));
217 extern void c_expand_decl_stmt
PARAMS ((tree
));
220 extern tree require_complete_type
PARAMS ((tree
));
221 extern int comptypes
PARAMS ((tree
, tree
));
222 extern tree c_sizeof
PARAMS ((tree
));
223 extern tree c_sizeof_nowarn
PARAMS ((tree
));
224 extern tree c_size_in_bytes
PARAMS ((tree
));
225 extern tree c_alignof
PARAMS ((tree
));
226 extern tree c_alignof_expr
PARAMS ((tree
));
227 extern tree build_component_ref
PARAMS ((tree
, tree
));
228 extern tree build_indirect_ref
PARAMS ((tree
, const char *));
229 extern tree build_array_ref
PARAMS ((tree
, tree
));
230 extern tree build_external_ref
PARAMS ((tree
, int));
231 extern tree parser_build_binary_op
PARAMS ((enum tree_code
,
233 extern void readonly_warning
PARAMS ((tree
, const char *));
234 extern tree build_conditional_expr
PARAMS ((tree
, tree
, tree
));
235 extern tree build_compound_expr
PARAMS ((tree
));
236 extern tree c_cast_expr
PARAMS ((tree
, tree
));
237 extern tree build_c_cast
PARAMS ((tree
, tree
));
238 extern tree build_modify_expr
PARAMS ((tree
, enum tree_code
,
240 extern void store_init_value
PARAMS ((tree
, tree
));
241 extern void error_init
PARAMS ((const char *));
242 extern void pedwarn_init
PARAMS ((const char *));
243 extern void start_init
PARAMS ((tree
, tree
, int));
244 extern void finish_init
PARAMS ((void));
245 extern void really_start_incremental_init
PARAMS ((tree
));
246 extern void push_init_level
PARAMS ((int));
247 extern tree pop_init_level
PARAMS ((int));
248 extern void set_init_index
PARAMS ((tree
, tree
));
249 extern void set_init_label
PARAMS ((tree
));
250 extern void process_init_element
PARAMS ((tree
));
251 extern void pedwarn_c99
PARAMS ((const char *, ...))
253 extern tree c_start_case
PARAMS ((tree
));
254 extern void c_finish_case
PARAMS ((void));
255 extern tree simple_asm_stmt
PARAMS ((tree
));
256 extern tree build_asm_stmt
PARAMS ((tree
, tree
, tree
,
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 traditional constructs whose meanings changed in ANSI C. */
326 extern int warn_traditional
;
328 /* Warn about a subscript that has type char. */
330 extern int warn_char_subscripts
;
332 /* Warn if main is suspicious. */
334 extern int warn_main
;
336 /* Nonzero means to allow single precision math even if we're generally
337 being traditional. */
338 extern int flag_allow_single_precision
;
340 /* Warn if initializer is not completely bracketed. */
342 extern int warn_missing_braces
;
344 /* Warn about comparison of signed and unsigned values. */
346 extern int warn_sign_compare
;
348 /* Warn about testing equality of floating point numbers. */
350 extern int warn_float_equal
;
352 /* Warn about multicharacter constants. */
354 extern int warn_multichar
;
356 /* Nonzero means we are reading code that came from a system header file. */
358 extern int system_header_p
;
360 /* Warn about implicit declarations. 1 = warning, 2 = error. */
361 extern int mesg_implicit_function_declaration
;
364 extern void finish_incomplete_decl
PARAMS ((tree
));
366 #endif /* ! GCC_C_TREE_H */