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[thirdparty/gcc.git] / gcc / c-tree.h
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907a24a1 1/* Definitions for C parsing and type checking.
ca628a86 2 Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998,
163d43d8 3 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
907a24a1 4
f12b58b3 5This file is part of GCC.
907a24a1 6
f12b58b3 7GCC is free software; you can redistribute it and/or modify it under
8the terms of the GNU General Public License as published by the Free
9Software Foundation; either version 2, or (at your option) any later
10version.
907a24a1 11
f12b58b3 12GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13WARRANTY; without even the implied warranty of MERCHANTABILITY or
14FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15for more details.
907a24a1 16
17You should have received a copy of the GNU General Public License
f12b58b3 18along with GCC; see the file COPYING. If not, write to the Free
19Software Foundation, 59 Temple Place - Suite 330, Boston, MA
2002111-1307, USA. */
907a24a1 21
2a281353 22#ifndef GCC_C_TREE_H
23#define GCC_C_TREE_H
7ba2cd99 24
72040e7e 25#include "c-common.h"
26
907a24a1 27/* Language-dependent contents of an identifier. */
28
91ccdac7 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
518796ad 31 be referenced after they fall out of scope, so they can't be global.
32
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. */
91ccdac7 36
1f3233d1 37struct lang_identifier GTY(())
907a24a1 38{
1f3233d1 39 struct c_common_identifier common_id;
40 tree global_value;
41 tree local_value;
42 tree label_value;
43 tree implicit_decl;
44 tree error_locus;
45 tree limbo_value;
46};
47
48/* The resulting tree type. */
49
50union lang_tree_node
51 GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE")))
52{
53 union tree_node GTY ((tag ("0"),
54 desc ("tree_node_structure (&%h)")))
55 generic;
56 struct lang_identifier GTY ((tag ("1"))) identifier;
907a24a1 57};
58
ce467a73 59/* Language-specific declaration information. */
e41f0d80 60
1f3233d1 61struct lang_decl GTY(())
e41f0d80 62{
63 struct c_lang_decl base;
ce467a73 64 /* The return types and parameter types may have variable size.
65 This is a list of any SAVE_EXPRs that need to be evaluated to
66 compute those sizes. */
67 tree pending_sizes;
e41f0d80 68};
69
907a24a1 70/* Macros for access to language-specific slots in an identifier. */
8a135163 71/* Each of these slots contains a DECL node or null. */
907a24a1 72
8a135163 73/* This represents the value which the identifier has in the
74 file-scope namespace. */
907a24a1 75#define IDENTIFIER_GLOBAL_VALUE(NODE) \
a92771b8 76 (((struct lang_identifier *) (NODE))->global_value)
8a135163 77/* This represents the value which the identifier has in the current
78 scope. */
907a24a1 79#define IDENTIFIER_LOCAL_VALUE(NODE) \
a92771b8 80 (((struct lang_identifier *) (NODE))->local_value)
8a135163 81/* This represents the value which the identifier has as a label in
82 the current label scope. */
907a24a1 83#define IDENTIFIER_LABEL_VALUE(NODE) \
a92771b8 84 (((struct lang_identifier *) (NODE))->label_value)
8a135163 85/* This records the extern decl of this identifier, if it has had one
86 at any point in this compilation. */
f885582f 87#define IDENTIFIER_LIMBO_VALUE(NODE) \
a92771b8 88 (((struct lang_identifier *) (NODE))->limbo_value)
8a135163 89/* This records the implicit function decl of this identifier, if it
90 has had one at any point in this compilation. */
907a24a1 91#define IDENTIFIER_IMPLICIT_DECL(NODE) \
a92771b8 92 (((struct lang_identifier *) (NODE))->implicit_decl)
8a135163 93/* This is the last function in which we printed an "undefined variable"
94 message for this identifier. Value is a FUNCTION_DECL or null. */
907a24a1 95#define IDENTIFIER_ERROR_LOCUS(NODE) \
a92771b8 96 (((struct lang_identifier *) (NODE))->error_locus)
907a24a1 97
98/* In identifiers, C uses the following fields in a special way:
99 TREE_PUBLIC to record that there was a previous local extern decl.
100 TREE_USED to record that such a decl was used.
101 TREE_ADDRESSABLE to record that the address of such a decl was used. */
102
907a24a1 103/* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only. */
163d43d8 104#define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1 (TYPE)
907a24a1 105
106/* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile. */
163d43d8 107#define C_TYPE_FIELDS_VOLATILE(TYPE) TREE_LANG_FLAG_2 (TYPE)
907a24a1 108
109/* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
110 nonzero if the definition of the type has already started. */
163d43d8 111#define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE)
907a24a1 112
518796ad 113/* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
114 keyword. C_RID_CODE (node) is then the RID_* value of the keyword,
115 and C_RID_YYCODE is the token number wanted by Yacc. */
163d43d8 116#define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
518796ad 117
3b288406 118/* This function was declared inline. This flag controls the linkage
119 semantics of 'inline'; whether or not the function is inlined is
120 controlled by DECL_INLINE. */
121#define DECL_DECLARED_INLINE_P(NODE) \
122 (DECL_LANG_SPECIFIC (NODE)->base.declared_inline)
123
907a24a1 124/* In a RECORD_TYPE, a sorted array of the fields of the type. */
1f3233d1 125struct lang_type GTY(())
907a24a1 126{
127 int len;
1f3233d1 128 tree GTY((length ("%h.len"))) elts[1];
907a24a1 129};
130
907a24a1 131/* Record whether a type or decl was written with nonconstant size.
132 Note that TYPE_SIZE may have simplified to a constant. */
163d43d8 133#define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
134#define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
907a24a1 135
907a24a1 136#if 0 /* Not used. */
137/* Record whether a decl for a function or function pointer has
138 already been mentioned (in a warning) because it was called
139 but didn't have a prototype. */
163d43d8 140#define C_MISSING_PROTOTYPE_WARNED(DECL) DECL_LANG_FLAG_2 (DECL)
907a24a1 141#endif
142
143/* Store a value in that field. */
163d43d8 144#define C_SET_EXP_ORIGINAL_CODE(EXP, CODE) \
145 (TREE_COMPLEXITY (EXP) = (int) (CODE))
907a24a1 146
147/* Record whether a typedef for type `int' was actually `signed int'. */
163d43d8 148#define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
907a24a1 149
af857942 150/* For a FUNCTION_DECL, nonzero if it was defined without an explicit
151 return type. */
152#define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP)
153
20f91811 154/* Nonzero for a declaration of a built in function if there has been no
155 occasion that would declare the function in ordinary C.
156 Using the function draws a pedantic warning in this case. */
163d43d8 157#define C_DECL_ANTICIPATED(EXP) DECL_LANG_FLAG_3 (EXP)
20f91811 158
907a24a1 159/* For FUNCTION_TYPE, a hidden list of types of arguments. The same as
160 TYPE_ARG_TYPES for functions with prototypes, but created for functions
161 without prototypes. */
8cbe13ee 162#define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_BINFO (NODE)
ad9afbbd 163
907a24a1 164\f
e0cec600 165/* in c-lang.c and objc-act.c */
6a9a24a5 166extern tree lookup_interface PARAMS ((tree));
167extern tree is_class_name PARAMS ((tree));
168extern void maybe_objc_check_decl PARAMS ((tree));
169extern void finish_file PARAMS ((void));
170extern int maybe_objc_comptypes PARAMS ((tree, tree, int));
171extern tree maybe_building_objc_message_expr PARAMS ((void));
6a9a24a5 172extern int recognize_objc_keyword PARAMS ((void));
1beb61f9 173extern tree lookup_objc_ivar PARAMS ((tree));
78c551ad 174
96526206 175\f
dc12af01 176/* in c-parse.in */
6a9a24a5 177extern void c_parse_init PARAMS ((void));
dc12af01 178
96526206 179/* in c-aux-info.c */
6a9a24a5 180extern void gen_aux_info_record PARAMS ((tree, int, int, int));
907a24a1 181
96526206 182/* in c-decl.c */
20325f61 183extern int global_bindings_p PARAMS ((void));
184extern int kept_level_p PARAMS ((void));
185extern tree getdecls PARAMS ((void));
186extern void pushlevel PARAMS ((int));
187extern tree poplevel PARAMS ((int,int, int));
188extern void insert_block PARAMS ((tree));
189extern void set_block PARAMS ((tree));
190extern tree pushdecl PARAMS ((tree));
191
26ca6c20 192extern void c_insert_default_attributes PARAMS ((tree));
9ceb1c29 193extern void c_init_decl_processing PARAMS ((void));
dbc42b78 194extern void c_dup_lang_specific_decl PARAMS ((tree));
b7fced5e 195extern void c_print_identifier PARAMS ((FILE *, tree, int));
1fd94215 196extern tree build_array_declarator PARAMS ((tree, tree, int, int));
6a9a24a5 197extern tree build_enumerator PARAMS ((tree, tree));
6a9a24a5 198extern int c_decode_option PARAMS ((int, char **));
199extern void c_mark_varargs PARAMS ((void));
5e4f9988 200extern void check_for_loop_decls PARAMS ((void));
6a9a24a5 201extern void clear_parm_order PARAMS ((void));
6a9a24a5 202extern int complete_array_type PARAMS ((tree, tree, int));
203extern void declare_parm_level PARAMS ((int));
e772a198 204extern tree define_label PARAMS ((const char *, int,
205 tree));
6a9a24a5 206extern void finish_decl PARAMS ((tree, tree, tree));
6a9a24a5 207extern tree finish_enum PARAMS ((tree, tree, tree));
b3f7c02f 208extern void finish_function PARAMS ((int, int));
6a9a24a5 209extern tree finish_struct PARAMS ((tree, tree, tree));
210extern tree get_parm_info PARAMS ((int));
6a9a24a5 211extern tree grokfield PARAMS ((const char *, int, tree, tree, tree));
212extern tree groktypename PARAMS ((tree));
213extern tree groktypename_in_parm_context PARAMS ((tree));
214extern tree implicitly_declare PARAMS ((tree));
65a7af3f 215extern void implicit_decl_warning PARAMS ((tree));
6a9a24a5 216extern int in_parm_level_p PARAMS ((void));
6a9a24a5 217extern void keep_next_level PARAMS ((void));
6a9a24a5 218extern tree lookup_name PARAMS ((tree));
219extern tree lookup_name_current_level PARAMS ((tree));
6a9a24a5 220extern void parmlist_tags_warning PARAMS ((void));
221extern void pending_xref_error PARAMS ((void));
c80c4f22 222extern void c_push_function_context PARAMS ((struct function *));
223extern void c_pop_function_context PARAMS ((struct function *));
6a9a24a5 224extern void pop_label_level PARAMS ((void));
6a9a24a5 225extern void push_label_level PARAMS ((void));
226extern void push_parm_decl PARAMS ((tree));
6a9a24a5 227extern tree pushdecl_top_level PARAMS ((tree));
6a9a24a5 228extern void pushtag PARAMS ((tree, tree));
1fd94215 229extern tree set_array_declarator_type PARAMS ((tree, tree, int));
6a9a24a5 230extern tree shadow_label PARAMS ((tree));
6a9a24a5 231extern void shadow_tag PARAMS ((tree));
232extern void shadow_tag_warned PARAMS ((tree, int));
233extern tree start_enum PARAMS ((tree));
b1d10e93 234extern int start_function PARAMS ((tree, tree, tree));
6a9a24a5 235extern tree start_decl PARAMS ((tree, tree, int,
b1d10e93 236 tree));
6a9a24a5 237extern tree start_struct PARAMS ((enum tree_code, tree));
238extern void store_parm_decls PARAMS ((void));
239extern tree xref_tag PARAMS ((enum tree_code, tree));
e41f0d80 240extern tree c_begin_compound_stmt PARAMS ((void));
bf1846b6 241extern void c_expand_deferred_function PARAMS ((tree));
e41f0d80 242extern void c_expand_decl_stmt PARAMS ((tree));
90cc7820 243extern tree make_pointer_declarator PARAMS ((tree, tree));
aaa4d7e7 244
245/* in c-objc-common.c */
246extern int c_disregard_inline_limits PARAMS ((tree));
247extern int c_cannot_inline_tree_fn PARAMS ((tree *));
248extern const char *c_objc_common_init PARAMS ((const char *));
249extern int c_missing_noreturn_ok_p PARAMS ((tree));
250extern void c_objc_common_finish_file PARAMS ((void));
251extern int defer_fn PARAMS ((tree));
8d58a5a7 252extern bool c_warn_unused_global_decl PARAMS ((tree));
aaa4d7e7 253
254#define c_build_type_variant(TYPE, CONST_P, VOLATILE_P) \
255 c_build_qualified_type ((TYPE), \
256 ((CONST_P) ? TYPE_QUAL_CONST : 0) | \
257 ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
258
96526206 259/* in c-typeck.c */
6a9a24a5 260extern tree require_complete_type PARAMS ((tree));
6a9a24a5 261extern int comptypes PARAMS ((tree, tree));
3cc762d0 262extern tree c_sizeof_nowarn PARAMS ((tree));
6a9a24a5 263extern tree c_size_in_bytes PARAMS ((tree));
9b86eec0 264extern bool c_mark_addressable PARAMS ((tree));
1dd25100 265extern void c_incomplete_type_error PARAMS ((tree, tree));
63c62881 266extern tree c_type_promotes_to PARAMS ((tree));
6a9a24a5 267extern tree build_component_ref PARAMS ((tree, tree));
268extern tree build_indirect_ref PARAMS ((tree, const char *));
269extern tree build_array_ref PARAMS ((tree, tree));
1beb61f9 270extern tree build_external_ref PARAMS ((tree, int));
6a9a24a5 271extern tree parser_build_binary_op PARAMS ((enum tree_code,
272 tree, tree));
6a9a24a5 273extern void readonly_warning PARAMS ((tree, const char *));
6a9a24a5 274extern tree build_conditional_expr PARAMS ((tree, tree, tree));
275extern tree build_compound_expr PARAMS ((tree));
d0a47c8d 276extern tree c_cast_expr PARAMS ((tree, tree));
277extern tree build_c_cast PARAMS ((tree, tree));
6a9a24a5 278extern tree build_modify_expr PARAMS ((tree, enum tree_code,
279 tree));
280extern void store_init_value PARAMS ((tree, tree));
281extern void error_init PARAMS ((const char *));
282extern void pedwarn_init PARAMS ((const char *));
283extern void start_init PARAMS ((tree, tree, int));
284extern void finish_init PARAMS ((void));
285extern void really_start_incremental_init PARAMS ((tree));
286extern void push_init_level PARAMS ((int));
287extern tree pop_init_level PARAMS ((int));
288extern void set_init_index PARAMS ((tree, tree));
289extern void set_init_label PARAMS ((tree));
290extern void process_init_element PARAMS ((tree));
ec11e38e 291extern tree build_compound_literal PARAMS ((tree, tree));
41356c44 292extern void pedwarn_c99 PARAMS ((const char *, ...))
293 ATTRIBUTE_PRINTF_1;
e41f0d80 294extern tree c_start_case PARAMS ((tree));
295extern void c_finish_case PARAMS ((void));
d0a47c8d 296extern tree simple_asm_stmt PARAMS ((tree));
7cad36f4 297extern tree build_asm_stmt PARAMS ((tree, tree, tree,
298 tree, tree));
78b80426 299extern tree c_convert_parm_for_inlining PARAMS ((tree, tree, tree));
907a24a1 300
301/* Set to 0 at beginning of a function definition, set to 1 if
302 a return statement that specifies a return value is seen. */
303
304extern int current_function_returns_value;
305
306/* Set to 0 at beginning of a function definition, set to 1 if
307 a return statement with no argument is seen. */
308
309extern int current_function_returns_null;
310
af857942 311/* Set to 0 at beginning of a function definition, set to 1 if
312 a call to a noreturn function is seen. */
313
314extern int current_function_returns_abnormally;
315
14f89678 316/* Nonzero means the expression being parsed will never be evaluated.
317 This is a count, since unevaluated expressions can nest. */
318
319extern int skip_evaluation;
320
907a24a1 321/* Nonzero means `$' can be in an identifier. */
322
323extern int dollars_in_ident;
324
325/* Nonzero means allow type mismatches in conditional expressions;
a7dce381 326 just make their values `void'. */
907a24a1 327
328extern int flag_cond_mismatch;
329
330/* Nonzero means don't recognize the keyword `asm'. */
331
332extern int flag_no_asm;
333
907a24a1 334/* Nonzero means warn about implicit declarations. */
335
336extern int warn_implicit;
337
907a24a1 338/* Nonzero means warn for all old-style non-prototype function decls. */
339
340extern int warn_strict_prototypes;
341
342/* Nonzero means warn about multiple (redundant) decls for the same single
343 variable or function. */
344
345extern int warn_redundant_decls;
346
347/* Nonzero means warn about extern declarations of objects not at
348 file-scope level and about *all* declarations of functions (whether
349 extern or static) not at file-scope level. Note that we exclude
350 implicit function declarations. To get warnings about those, use
351 -Wimplicit. */
352
353extern int warn_nested_externs;
354
355/* Nonzero means warn about pointer casts that can drop a type qualifier
356 from the pointer target type. */
357
358extern int warn_cast_qual;
359
14223793 360/* Nonzero means warn when casting a function call to a type that does
361 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
362 when there is no previous declaration of sqrt or malloc. */
363
364extern int warn_bad_function_cast;
365
907a24a1 366/* Warn about traditional constructs whose meanings changed in ANSI C. */
367
368extern int warn_traditional;
369
907a24a1 370/* Warn about a subscript that has type char. */
371
372extern int warn_char_subscripts;
373
ab6d34f7 374/* Warn if main is suspicious. */
a8d176c1 375
376extern int warn_main;
377
c5f583be 378/* Warn if initializer is not completely bracketed. */
379
380extern int warn_missing_braces;
381
d4661673 382/* Warn about comparison of signed and unsigned values. */
383
86e6764e 384extern int warn_sign_compare;
d4661673 385
ab6d34f7 386/* Warn about testing equality of floating point numbers. */
12154bcf 387
388extern int warn_float_equal;
389
907a24a1 390/* Nonzero means we are reading code that came from a system header file. */
391
392extern int system_header_p;
96526206 393
65a7af3f 394/* Warn about implicit declarations. 1 = warning, 2 = error. */
395extern int mesg_implicit_function_declaration;
396
eea57b92 397/* In c-decl.c */
ee23fd7b 398extern void c_finish_incomplete_decl PARAMS ((tree));
eea57b92 399
1f3233d1 400extern GTY(()) tree static_ctors;
401extern GTY(()) tree static_dtors;
4cfbaf39 402
2a281353 403#endif /* ! GCC_C_TREE_H */
Mirror of https://gcc.gnu.org/git/gcc.git