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 /* Wrapping c_lang_decl in another struct is an unfortunate
50 struct c_lang_decl base
;
53 /* Macros for access to language-specific slots in an identifier. */
54 /* Each of these slots contains a DECL node or null. */
56 /* This represents the value which the identifier has in the
57 file-scope namespace. */
58 #define IDENTIFIER_GLOBAL_VALUE(NODE) \
59 (((struct lang_identifier *) (NODE))->global_value)
60 /* This represents the value which the identifier has in the current
62 #define IDENTIFIER_LOCAL_VALUE(NODE) \
63 (((struct lang_identifier *) (NODE))->local_value)
64 /* This represents the value which the identifier has as a label in
65 the current label scope. */
66 #define IDENTIFIER_LABEL_VALUE(NODE) \
67 (((struct lang_identifier *) (NODE))->label_value)
68 /* This records the extern decl of this identifier, if it has had one
69 at any point in this compilation. */
70 #define IDENTIFIER_LIMBO_VALUE(NODE) \
71 (((struct lang_identifier *) (NODE))->limbo_value)
72 /* This records the implicit function decl of this identifier, if it
73 has had one at any point in this compilation. */
74 #define IDENTIFIER_IMPLICIT_DECL(NODE) \
75 (((struct lang_identifier *) (NODE))->implicit_decl)
76 /* This is the last function in which we printed an "undefined variable"
77 message for this identifier. Value is a FUNCTION_DECL or null. */
78 #define IDENTIFIER_ERROR_LOCUS(NODE) \
79 (((struct lang_identifier *) (NODE))->error_locus)
81 /* In identifiers, C uses the following fields in a special way:
82 TREE_PUBLIC to record that there was a previous local extern decl.
83 TREE_USED to record that such a decl was used.
84 TREE_ADDRESSABLE to record that the address of such a decl was used. */
86 /* Nonzero means reject anything that ANSI standard C forbids. */
89 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only. */
90 #define C_TYPE_FIELDS_READONLY(type) TREE_LANG_FLAG_1 (type)
92 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile. */
93 #define C_TYPE_FIELDS_VOLATILE(type) TREE_LANG_FLAG_2 (type)
95 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
96 nonzero if the definition of the type has already started. */
97 #define C_TYPE_BEING_DEFINED(type) TYPE_LANG_FLAG_0 (type)
99 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
100 keyword. C_RID_CODE (node) is then the RID_* value of the keyword,
101 and C_RID_YYCODE is the token number wanted by Yacc. */
103 #define C_IS_RESERVED_WORD(id) TREE_LANG_FLAG_0 (id)
104 #define C_RID_CODE(id) \
105 (((struct lang_identifier *) (id))->rid_code)
107 /* In a RECORD_TYPE, a sorted array of the fields of the type. */
114 /* Record whether a type or decl was written with nonconstant size.
115 Note that TYPE_SIZE may have simplified to a constant. */
116 #define C_TYPE_VARIABLE_SIZE(type) TYPE_LANG_FLAG_1 (type)
117 #define C_DECL_VARIABLE_SIZE(type) DECL_LANG_FLAG_0 (type)
119 #if 0 /* Not used. */
120 /* Record whether a decl for a function or function pointer has
121 already been mentioned (in a warning) because it was called
122 but didn't have a prototype. */
123 #define C_MISSING_PROTOTYPE_WARNED(decl) DECL_LANG_FLAG_2(decl)
126 /* Store a value in that field. */
127 #define C_SET_EXP_ORIGINAL_CODE(exp, code) \
128 (TREE_COMPLEXITY (exp) = (int) (code))
130 /* Record whether a typedef for type `int' was actually `signed int'. */
131 #define C_TYPEDEF_EXPLICITLY_SIGNED(exp) DECL_LANG_FLAG_1 ((exp))
133 /* Nonzero for a declaration of a built in function if there has been no
134 occasion that would declare the function in ordinary C.
135 Using the function draws a pedantic warning in this case. */
136 #define C_DECL_ANTICIPATED(exp) DECL_LANG_FLAG_3 ((exp))
138 /* For FUNCTION_TYPE, a hidden list of types of arguments. The same as
139 TYPE_ARG_TYPES for functions with prototypes, but created for functions
140 without prototypes. */
141 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_NONCOPIED_PARTS (NODE)
143 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield. */
144 #define DECL_C_BIT_FIELD(NODE) DECL_LANG_FLAG_4 (NODE)
147 /* in c-lang.c and objc-act.c */
148 extern tree lookup_interface
PARAMS ((tree
));
149 extern tree is_class_name
PARAMS ((tree
));
150 extern void maybe_objc_check_decl
PARAMS ((tree
));
151 extern void finish_file
PARAMS ((void));
152 extern int maybe_objc_comptypes
PARAMS ((tree
, tree
, int));
153 extern tree maybe_building_objc_message_expr
PARAMS ((void));
154 extern tree maybe_objc_method_name
PARAMS ((tree
));
155 extern int recognize_objc_keyword
PARAMS ((void));
156 extern tree lookup_objc_ivar
PARAMS ((tree
));
159 extern void c_parse_init
PARAMS ((void));
161 /* in c-aux-info.c */
162 extern void gen_aux_info_record
PARAMS ((tree
, int, int, int));
165 extern tree convert
PARAMS ((tree
, tree
));
168 extern tree build_enumerator
PARAMS ((tree
, tree
));
170 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P) \
171 c_build_qualified_type (TYPE, \
172 ((CONST_P) ? TYPE_QUAL_CONST : 0) | \
173 ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
174 extern int c_decode_option
PARAMS ((int, char **));
175 extern void c_mark_varargs
PARAMS ((void));
176 extern tree check_identifier
PARAMS ((tree
, tree
));
177 extern void clear_parm_order
PARAMS ((void));
178 extern tree combine_parm_decls
PARAMS ((tree
, tree
, int));
179 extern int complete_array_type
PARAMS ((tree
, tree
, int));
180 extern void declare_parm_level
PARAMS ((int));
181 extern tree define_label
PARAMS ((const char *, int,
183 extern void delete_block
PARAMS ((tree
));
184 extern void finish_decl
PARAMS ((tree
, tree
, tree
));
185 extern void finish_decl_top_level
PARAMS ((tree
, tree
, tree
));
186 extern tree finish_enum
PARAMS ((tree
, tree
, tree
));
187 extern void finish_function
PARAMS ((int));
188 extern tree finish_struct
PARAMS ((tree
, tree
, tree
));
189 extern tree get_parm_info
PARAMS ((int));
190 extern tree getdecls
PARAMS ((void));
191 extern tree gettags
PARAMS ((void));
192 extern int global_bindings_p
PARAMS ((void));
193 extern tree grokfield
PARAMS ((const char *, int, tree
, tree
, tree
));
194 extern tree groktypename
PARAMS ((tree
));
195 extern tree groktypename_in_parm_context
PARAMS ((tree
));
196 extern tree implicitly_declare
PARAMS ((tree
));
197 extern void implicit_decl_warning
PARAMS ((tree
));
198 extern int in_parm_level_p
PARAMS ((void));
199 extern void init_decl_processing
PARAMS ((void));
200 extern void insert_block
PARAMS ((tree
));
201 extern void keep_next_level
PARAMS ((void));
202 extern int kept_level_p
PARAMS ((void));
203 extern tree lookup_label
PARAMS ((tree
));
204 extern tree lookup_name
PARAMS ((tree
));
205 extern tree lookup_name_current_level
PARAMS ((tree
));
206 extern tree lookup_name_current_level_global
PARAMS ((tree
));
207 extern tree maybe_build_cleanup
PARAMS ((tree
));
208 extern void parmlist_tags_warning
PARAMS ((void));
209 extern void pending_xref_error
PARAMS ((void));
210 extern void mark_c_function_context
PARAMS ((struct function
*));
211 extern void push_c_function_context
PARAMS ((struct function
*));
212 extern void pop_c_function_context
PARAMS ((struct function
*));
213 extern void pop_label_level
PARAMS ((void));
214 extern tree poplevel
PARAMS ((int, int, int));
215 extern void print_lang_decl
PARAMS ((FILE *, tree
, int));
216 extern void print_lang_identifier
PARAMS ((FILE *, tree
, int));
217 extern void print_lang_type
PARAMS ((FILE *, tree
, int));
218 extern void push_label_level
PARAMS ((void));
219 extern void push_parm_decl
PARAMS ((tree
));
220 extern tree pushdecl
PARAMS ((tree
));
221 extern tree pushdecl_top_level
PARAMS ((tree
));
222 extern void pushlevel
PARAMS ((int));
223 extern void pushtag
PARAMS ((tree
, tree
));
224 extern void set_block
PARAMS ((tree
));
225 extern tree shadow_label
PARAMS ((tree
));
226 extern void shadow_record_fields
PARAMS ((tree
));
227 extern void shadow_tag
PARAMS ((tree
));
228 extern void shadow_tag_warned
PARAMS ((tree
, int));
229 extern tree start_enum
PARAMS ((tree
));
230 extern int start_function
PARAMS ((tree
, tree
, tree
,
232 extern tree start_decl
PARAMS ((tree
, tree
, int,
234 extern tree start_struct
PARAMS ((enum tree_code
, tree
));
235 extern void store_parm_decls
PARAMS ((void));
236 extern tree xref_tag
PARAMS ((enum tree_code
, tree
));
237 extern tree c_begin_compound_stmt
PARAMS ((void));
238 extern void c_expand_decl_stmt
PARAMS ((tree
));
241 extern tree require_complete_type
PARAMS ((tree
));
242 extern void incomplete_type_error
PARAMS ((tree
, tree
));
243 extern int comptypes
PARAMS ((tree
, tree
));
244 extern tree c_sizeof
PARAMS ((tree
));
245 extern tree c_sizeof_nowarn
PARAMS ((tree
));
246 extern tree c_size_in_bytes
PARAMS ((tree
));
247 extern tree c_alignof
PARAMS ((tree
));
248 extern tree c_alignof_expr
PARAMS ((tree
));
249 extern tree build_component_ref
PARAMS ((tree
, tree
));
250 extern tree build_indirect_ref
PARAMS ((tree
, const char *));
251 extern tree build_array_ref
PARAMS ((tree
, tree
));
252 extern tree build_external_ref
PARAMS ((tree
, int));
253 extern tree build_function_call
PARAMS ((tree
, tree
));
254 extern tree parser_build_binary_op
PARAMS ((enum tree_code
,
256 extern int lvalue_or_else
PARAMS ((tree
, const char *));
257 extern void readonly_warning
PARAMS ((tree
, const char *));
258 extern int mark_addressable
PARAMS ((tree
));
259 extern tree build_conditional_expr
PARAMS ((tree
, tree
, tree
));
260 extern tree build_compound_expr
PARAMS ((tree
));
261 extern tree build_c_cast
PARAMS ((tree
, tree
));
262 extern tree build_modify_expr
PARAMS ((tree
, enum tree_code
,
264 extern void store_init_value
PARAMS ((tree
, tree
));
265 extern void error_init
PARAMS ((const char *));
266 extern void pedwarn_init
PARAMS ((const char *));
267 extern void start_init
PARAMS ((tree
, tree
, int));
268 extern void finish_init
PARAMS ((void));
269 extern void really_start_incremental_init
PARAMS ((tree
));
270 extern void push_init_level
PARAMS ((int));
271 extern tree pop_init_level
PARAMS ((int));
272 extern void set_init_index
PARAMS ((tree
, tree
));
273 extern void set_init_label
PARAMS ((tree
));
274 extern void process_init_element
PARAMS ((tree
));
275 extern void pedwarn_c99
PARAMS ((const char *, ...))
277 extern tree c_start_case
PARAMS ((tree
));
278 extern void c_finish_case
PARAMS ((void));
280 /* Set to 0 at beginning of a function definition, set to 1 if
281 a return statement that specifies a return value is seen. */
283 extern int current_function_returns_value
;
285 /* Set to 0 at beginning of a function definition, set to 1 if
286 a return statement with no argument is seen. */
288 extern int current_function_returns_null
;
290 /* Nonzero means the expression being parsed will never be evaluated.
291 This is a count, since unevaluated expressions can nest. */
293 extern int skip_evaluation
;
295 /* Nonzero means `$' can be in an identifier. */
297 extern int dollars_in_ident
;
299 /* Nonzero means allow type mismatches in conditional expressions;
300 just make their values `void'. */
302 extern int flag_cond_mismatch
;
304 /* Nonzero means don't recognize the keyword `asm'. */
306 extern int flag_no_asm
;
308 /* Nonzero means warn about implicit declarations. */
310 extern int warn_implicit
;
312 /* Nonzero means warn about sizeof (function) or addition/subtraction
313 of function pointers. */
315 extern int warn_pointer_arith
;
317 /* Nonzero means warn for all old-style non-prototype function decls. */
319 extern int warn_strict_prototypes
;
321 /* Nonzero means warn about multiple (redundant) decls for the same single
322 variable or function. */
324 extern int warn_redundant_decls
;
326 /* Nonzero means warn about extern declarations of objects not at
327 file-scope level and about *all* declarations of functions (whether
328 extern or static) not at file-scope level. Note that we exclude
329 implicit function declarations. To get warnings about those, use
332 extern int warn_nested_externs
;
334 /* Nonzero means warn about pointer casts that can drop a type qualifier
335 from the pointer target type. */
337 extern int warn_cast_qual
;
339 /* Nonzero means warn when casting a function call to a type that does
340 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
341 when there is no previous declaration of sqrt or malloc. */
343 extern int warn_bad_function_cast
;
345 /* Warn about traditional constructs whose meanings changed in ANSI C. */
347 extern int warn_traditional
;
349 /* Warn about a subscript that has type char. */
351 extern int warn_char_subscripts
;
353 /* Warn if main is suspicious. */
355 extern int warn_main
;
357 /* Nonzero means to allow single precision math even if we're generally
358 being traditional. */
359 extern int flag_allow_single_precision
;
361 /* Warn if initializer is not completely bracketed. */
363 extern int warn_missing_braces
;
365 /* Warn about comparison of signed and unsigned values. */
367 extern int warn_sign_compare
;
369 /* Warn about testing equality of floating point numbers. */
371 extern int warn_float_equal
;
373 /* Warn about multicharacter constants. */
375 extern int warn_multichar
;
377 /* Warn about long long. */
379 extern int warn_long_long
;
381 /* Nonzero means we are reading code that came from a system header file. */
383 extern int system_header_p
;
385 /* Warn about implicit declarations. 1 = warning, 2 = error. */
386 extern int mesg_implicit_function_declaration
;
388 /* Nonzero enables objc features. */
390 #define doing_objc_thang \
391 (c_language == clk_objective_c)
394 extern void finish_incomplete_decl
PARAMS ((tree
));
396 #endif /* not _C_TREE_H */