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 /* C types are partitioned into three subsets: object, function, and
88 #define C_TYPE_OBJECT_P(type) \
89 (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
91 #define C_TYPE_FUNCTION_P(type) \
92 (TREE_CODE (type) == FUNCTION_TYPE)
94 #define C_TYPE_INCOMPLETE_P(type) \
95 (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
97 /* For convenience we define a single macro to identify the class of
98 object or incomplete types. */
99 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
100 (!C_TYPE_FUNCTION_P (type))
102 /* In a RECORD_TYPE, a sorted array of the fields of the type. */
109 /* Mark which labels are explicitly declared.
110 These may be shadowed, and may be referenced from nested functions. */
111 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
113 /* Record whether a type or decl was written with nonconstant size.
114 Note that TYPE_SIZE may have simplified to a constant. */
115 #define C_TYPE_VARIABLE_SIZE(type) TYPE_LANG_FLAG_1 (type)
116 #define C_DECL_VARIABLE_SIZE(type) DECL_LANG_FLAG_0 (type)
118 /* Record in each node resulting from a binary operator
119 what operator was specified for it. */
120 #define C_EXP_ORIGINAL_CODE(exp) ((enum tree_code) TREE_COMPLEXITY (exp))
122 #if 0 /* Not used. */
123 /* Record whether a decl for a function or function pointer has
124 already been mentioned (in a warning) because it was called
125 but didn't have a prototype. */
126 #define C_MISSING_PROTOTYPE_WARNED(decl) DECL_LANG_FLAG_2(decl)
129 /* Store a value in that field. */
130 #define C_SET_EXP_ORIGINAL_CODE(exp, code) \
131 (TREE_COMPLEXITY (exp) = (int) (code))
133 /* Record whether a typedef for type `int' was actually `signed int'. */
134 #define C_TYPEDEF_EXPLICITLY_SIGNED(exp) DECL_LANG_FLAG_1 ((exp))
136 /* Nonzero for a declaration of a built in function if there has been no
137 occasion that would declare the function in ordinary C.
138 Using the function draws a pedantic warning in this case. */
139 #define C_DECL_ANTICIPATED(exp) DECL_LANG_FLAG_3 ((exp))
141 /* For FUNCTION_TYPE, a hidden list of types of arguments. The same as
142 TYPE_ARG_TYPES for functions with prototypes, but created for functions
143 without prototypes. */
144 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_NONCOPIED_PARTS (NODE)
146 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield. */
147 #define DECL_C_BIT_FIELD(NODE) DECL_LANG_FLAG_4 (NODE)
149 /* In a VAR_DECL, means the variable is really an iterator. */
150 #define ITERATOR_P(D) (DECL_LANG_FLAG_4(D))
152 /* In a VAR_DECL for an iterator, means we are within
153 an explicit loop over that iterator. */
154 #define ITERATOR_BOUND_P(NODE) ((NODE)->common.readonly_flag)
156 /* in c-lang.c and objc-act.c */
157 extern tree lookup_interface
PARAMS ((tree
));
158 extern tree is_class_name
PARAMS ((tree
));
159 extern void maybe_objc_check_decl
PARAMS ((tree
));
160 extern void finish_file
PARAMS ((void));
161 extern int maybe_objc_comptypes
PARAMS ((tree
, tree
, int));
162 extern tree maybe_building_objc_message_expr
PARAMS ((void));
163 extern tree maybe_objc_method_name
PARAMS ((tree
));
164 extern int recognize_objc_keyword
PARAMS ((void));
165 extern tree build_objc_string
PARAMS ((int, const char *));
168 extern void c_parse_init
PARAMS ((void));
170 /* in c-aux-info.c */
171 extern void gen_aux_info_record
PARAMS ((tree
, int, int, int));
174 extern unsigned int min_precision
PARAMS ((tree
, int));
177 extern tree convert
PARAMS ((tree
, tree
));
180 extern tree build_enumerator
PARAMS ((tree
, tree
));
181 /* Add qualifiers to a type, in the fashion for C. */
182 extern tree c_build_qualified_type
PARAMS ((tree
, int));
183 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P) \
184 c_build_qualified_type (TYPE, \
185 ((CONST_P) ? TYPE_QUAL_CONST : 0) | \
186 ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
187 extern int c_decode_option
PARAMS ((int, char **));
188 extern void c_mark_varargs
PARAMS ((void));
189 extern tree check_identifier
PARAMS ((tree
, tree
));
190 extern void clear_parm_order
PARAMS ((void));
191 extern tree combine_parm_decls
PARAMS ((tree
, tree
, int));
192 extern int complete_array_type
PARAMS ((tree
, tree
, int));
193 extern void declare_parm_level
PARAMS ((int));
194 extern tree define_label
PARAMS ((char *, int, tree
));
195 extern void delete_block
PARAMS ((tree
));
196 extern void finish_decl
PARAMS ((tree
, tree
, tree
));
197 extern void finish_decl_top_level
PARAMS ((tree
, tree
, tree
));
198 extern tree finish_enum
PARAMS ((tree
, tree
, tree
));
199 extern void finish_function
PARAMS ((int));
200 extern tree finish_struct
PARAMS ((tree
, tree
, tree
));
201 extern tree get_parm_info
PARAMS ((int));
202 extern tree getdecls
PARAMS ((void));
203 extern tree gettags
PARAMS ((void));
204 extern int global_bindings_p
PARAMS ((void));
205 extern tree grokfield
PARAMS ((const char *, int, tree
, tree
, tree
));
206 extern tree groktypename
PARAMS ((tree
));
207 extern tree groktypename_in_parm_context
PARAMS ((tree
));
208 extern tree implicitly_declare
PARAMS ((tree
));
209 extern int in_parm_level_p
PARAMS ((void));
210 extern void init_decl_processing
PARAMS ((void));
211 extern void insert_block
PARAMS ((tree
));
212 extern void keep_next_level
PARAMS ((void));
213 extern int kept_level_p
PARAMS ((void));
214 extern tree lookup_label
PARAMS ((tree
));
215 extern tree lookup_name
PARAMS ((tree
));
216 extern tree lookup_name_current_level
PARAMS ((tree
));
217 extern tree lookup_name_current_level_global
PARAMS ((tree
));
218 extern tree maybe_build_cleanup
PARAMS ((tree
));
219 extern void parmlist_tags_warning
PARAMS ((void));
220 extern void pending_xref_error
PARAMS ((void));
221 extern void mark_c_function_context
PARAMS ((struct function
*));
222 extern void push_c_function_context
PARAMS ((struct function
*));
223 extern void pop_c_function_context
PARAMS ((struct function
*));
224 extern void pop_label_level
PARAMS ((void));
225 extern tree poplevel
PARAMS ((int, int, int));
226 extern void print_lang_decl
PARAMS ((FILE *, tree
, int));
227 extern void print_lang_identifier
PARAMS ((FILE *, tree
, int));
228 extern void print_lang_type
PARAMS ((FILE *, tree
, int));
229 extern void push_label_level
PARAMS ((void));
230 extern void push_parm_decl
PARAMS ((tree
));
231 extern tree pushdecl
PARAMS ((tree
));
232 extern tree pushdecl_top_level
PARAMS ((tree
));
233 extern void pushlevel
PARAMS ((int));
234 extern void pushtag
PARAMS ((tree
, tree
));
235 extern void set_block
PARAMS ((tree
));
236 extern tree shadow_label
PARAMS ((tree
));
237 extern void shadow_record_fields
PARAMS ((tree
));
238 extern void shadow_tag
PARAMS ((tree
));
239 extern void shadow_tag_warned
PARAMS ((tree
, int));
240 extern tree start_enum
PARAMS ((tree
));
241 extern int start_function
PARAMS ((tree
, tree
, tree
,
243 extern tree start_decl
PARAMS ((tree
, tree
, int,
245 extern tree start_struct
PARAMS ((enum tree_code
, tree
));
246 extern void store_parm_decls
PARAMS ((void));
247 extern tree xref_tag
PARAMS ((enum tree_code
, tree
));
250 extern tree require_complete_type
PARAMS ((tree
));
251 extern void incomplete_type_error
PARAMS ((tree
, tree
));
252 /* Given two integer or real types, return the type for their sum.
253 Given two compatible ANSI C types, returns the merged type. */
254 extern tree common_type
PARAMS ((tree
, tree
));
255 extern int comptypes
PARAMS ((tree
, tree
));
256 extern tree c_sizeof
PARAMS ((tree
));
257 extern tree c_sizeof_nowarn
PARAMS ((tree
));
258 extern tree c_size_in_bytes
PARAMS ((tree
));
259 extern tree c_alignof
PARAMS ((tree
));
260 extern tree c_alignof_expr
PARAMS ((tree
));
261 extern tree default_conversion
PARAMS ((tree
));
262 extern tree build_component_ref
PARAMS ((tree
, tree
));
263 extern tree build_indirect_ref
PARAMS ((tree
, const char *));
264 extern tree build_array_ref
PARAMS ((tree
, tree
));
265 extern tree build_function_call
PARAMS ((tree
, tree
));
266 extern tree parser_build_binary_op
PARAMS ((enum tree_code
,
268 extern tree build_binary_op
PARAMS ((enum tree_code
,
270 extern tree build_unary_op
PARAMS ((enum tree_code
,
272 extern int lvalue_p
PARAMS ((tree
));
273 extern int lvalue_or_else
PARAMS ((tree
, const char *));
274 extern void readonly_warning
PARAMS ((tree
, const char *));
275 extern int mark_addressable
PARAMS ((tree
));
276 extern tree build_conditional_expr
PARAMS ((tree
, tree
, tree
));
277 extern tree build_compound_expr
PARAMS ((tree
));
278 extern tree build_c_cast
PARAMS ((tree
, tree
));
279 extern tree build_modify_expr
PARAMS ((tree
, enum tree_code
,
281 extern void store_init_value
PARAMS ((tree
, tree
));
282 extern void error_init
PARAMS ((const char *));
283 extern void pedwarn_init
PARAMS ((const char *));
284 extern void start_init
PARAMS ((tree
, tree
, int));
285 extern void finish_init
PARAMS ((void));
286 extern void really_start_incremental_init
PARAMS ((tree
));
287 extern void push_init_level
PARAMS ((int));
288 extern tree pop_init_level
PARAMS ((int));
289 extern void set_init_index
PARAMS ((tree
, tree
));
290 extern void set_init_label
PARAMS ((tree
));
291 extern void process_init_element
PARAMS ((tree
));
292 extern void c_expand_asm_operands
PARAMS ((tree
, tree
, tree
,
295 extern void c_expand_return
PARAMS ((tree
));
296 extern tree c_expand_start_case
PARAMS ((tree
));
299 extern void init_iterators
PARAMS ((void));
300 extern void iterator_expand
PARAMS ((tree
));
301 extern void iterator_for_loop_start
PARAMS ((tree
));
302 extern void iterator_for_loop_end
PARAMS ((tree
));
303 extern void iterator_for_loop_record
PARAMS ((tree
));
304 extern void push_iterator_stack
PARAMS ((void));
305 extern void pop_iterator_stack
PARAMS ((void));
307 /* Set to 0 at beginning of a function definition, set to 1 if
308 a return statement that specifies a return value is seen. */
310 extern int current_function_returns_value
;
312 /* Set to 0 at beginning of a function definition, set to 1 if
313 a return statement with no argument is seen. */
315 extern int current_function_returns_null
;
317 /* Nonzero means the expression being parsed will never be evaluated.
318 This is a count, since unevaluated expressions can nest. */
320 extern int skip_evaluation
;
322 /* Nonzero means `$' can be in an identifier. */
324 extern int dollars_in_ident
;
326 /* Nonzero means allow type mismatches in conditional expressions;
327 just make their values `void'. */
329 extern int flag_cond_mismatch
;
331 /* Nonzero means don't recognize the keyword `asm'. */
333 extern int flag_no_asm
;
335 /* Nonzero means environment is hosted (i.e., not freestanding) */
337 extern int flag_hosted
;
339 /* Nonzero means warn about implicit declarations. */
341 extern int warn_implicit
;
343 /* Nonzero means give string constants the type `const char *'
344 to get extra warnings from them. These warnings will be too numerous
345 to be useful, except in thoroughly ANSIfied programs. */
347 extern int flag_const_strings
;
349 /* Nonzero means warn about sizeof (function) or addition/subtraction
350 of function pointers. */
352 extern int warn_pointer_arith
;
354 /* Nonzero means warn for all old-style non-prototype function decls. */
356 extern int warn_strict_prototypes
;
358 /* Nonzero means warn about multiple (redundant) decls for the same single
359 variable or function. */
361 extern int warn_redundant_decls
;
363 /* Nonzero means warn about extern declarations of objects not at
364 file-scope level and about *all* declarations of functions (whether
365 extern or static) not at file-scope level. Note that we exclude
366 implicit function declarations. To get warnings about those, use
369 extern int warn_nested_externs
;
371 /* Nonzero means warn about pointer casts that can drop a type qualifier
372 from the pointer target type. */
374 extern int warn_cast_qual
;
376 /* Nonzero means warn when casting a function call to a type that does
377 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
378 when there is no previous declaration of sqrt or malloc. */
380 extern int warn_bad_function_cast
;
382 /* Warn about functions which might be candidates for attribute noreturn. */
384 extern int warn_missing_noreturn
;
386 /* Warn about traditional constructs whose meanings changed in ANSI C. */
388 extern int warn_traditional
;
390 /* Warn about *printf or *scanf format/argument anomalies. */
392 extern int warn_format
;
394 /* Warn about a subscript that has type char. */
396 extern int warn_char_subscripts
;
398 /* Warn if a type conversion is done that might have confusing results. */
400 extern int warn_conversion
;
402 /* Warn if main is suspicious. */
404 extern int warn_main
;
406 /* Nonzero means do some things the same way PCC does. */
408 extern int flag_traditional
;
410 /* Nonzero means use the ISO C99 dialect of C. */
412 extern int flag_isoc99
;
414 /* Nonzero means to allow single precision math even if we're generally
415 being traditional. */
416 extern int flag_allow_single_precision
;
418 /* Nonzero means warn about suggesting putting in ()'s. */
420 extern int warn_parentheses
;
422 /* Warn if initializer is not completely bracketed. */
424 extern int warn_missing_braces
;
426 /* Warn about comparison of signed and unsigned values. */
428 extern int warn_sign_compare
;
430 /* Warn about testing equality of floating point numbers. */
432 extern int warn_float_equal
;
434 /* Warn about multicharacter constants. */
436 extern int warn_multichar
;
438 /* Warn about long long. */
440 extern int warn_long_long
;
442 /* Nonzero means we are reading code that came from a system header file. */
444 extern int system_header_p
;
446 /* Nonzero enables objc features. */
448 extern int doing_objc_thang
;
451 extern void finish_incomplete_decl
PARAMS ((tree
));
453 #endif /* not _C_TREE_H */