gcc/c-tree.h

   1 /* Definitions for C parsing and type checking.
   2    Copyright (C) 1987, 93-95, 97-99, 2000 Free Software Foundation, Inc.
   3
   4 This file is part of GNU CC.
   5
   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)
   9 any later version.
  10
  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.
  15
  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.  */
  20
  21 #ifndef _C_TREE_H
  22 #define _C_TREE_H
  23
  24 #include "c-common.h"
  25
  26 /* Language-dependent contents of an identifier.  */
  27
  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.  */
  31
  32 struct lang_identifier
  33 {
  34   struct tree_identifier ignore;
  35   tree global_value, local_value, label_value, implicit_decl;
  36   tree error_locus, limbo_value;
  37 };
  38
  39 /* Macros for access to language-specific slots in an identifier.  */
  40 /* Each of these slots contains a DECL node or null.  */
  41
  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
  47    scope.  */
  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)
  66
  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.  */
  71
  72 /* Nonzero means reject anything that ANSI standard C forbids.  */
  73 extern int pedantic;
  74
  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)
  77
  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)
  80
  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)
  84
  85 /* C types are partitioned into three subsets: object, function, and
  86    incomplete types.  */
  87 #define C_TYPE_OBJECT_P(type) \
  88   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
  89
  90 #define C_TYPE_FUNCTION_P(type) \
  91   (TREE_CODE (type) == FUNCTION_TYPE)
  92
  93 #define C_TYPE_INCOMPLETE_P(type) \
  94   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
  95
  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))
 100
 101 /* In a RECORD_TYPE, a sorted array of the fields of the type.  */
 102 struct lang_type
 103 {
 104   int len;
 105   tree elts[1];
 106 };
 107
 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)
 111
 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)
 116
 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))
 120
 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)
 126 #endif
 127
 128 /* Store a value in that field.  */
 129 #define C_SET_EXP_ORIGINAL_CODE(exp, code) \
 130   (TREE_COMPLEXITY (exp) = (int) (code))
 131
 132 /* Record whether a typedef for type `int' was actually `signed int'.  */
 133 #define C_TYPEDEF_EXPLICITLY_SIGNED(exp) DECL_LANG_FLAG_1 ((exp))
 134
 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))
 139
 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)
 144
 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)
 147
 148 /* In a VAR_DECL, means the variable is really an iterator.  */
 149 #define ITERATOR_P(D) (DECL_LANG_FLAG_4(D))
 150
 151 /* In a VAR_DECL for an iterator, means we are within
 152    an explicit loop over that iterator.  */
 153 #define ITERATOR_BOUND_P(NODE) ((NODE)->common.readonly_flag)
 154 \f
 155 /* in c-lang.c and objc-act.c */
 156 extern tree lookup_interface                    PARAMS ((tree));
 157 extern tree is_class_name                       PARAMS ((tree));
 158 extern void maybe_objc_check_decl               PARAMS ((tree));
 159 extern void finish_file                         PARAMS ((void));
 160 extern int maybe_objc_comptypes                 PARAMS ((tree, tree, int));
 161 extern tree maybe_building_objc_message_expr    PARAMS ((void));
 162 extern tree maybe_objc_method_name              PARAMS ((tree));
 163 extern int recognize_objc_keyword               PARAMS ((void));
 164 extern tree build_objc_string                   PARAMS ((int, const char *));
 165 \f
 166 /* in c-parse.in */
 167 extern void c_parse_init                        PARAMS ((void));
 168
 169 /* in c-aux-info.c */
 170 extern void gen_aux_info_record                 PARAMS ((tree, int, int, int));
 171
 172 /* in c-convert.c */
 173 extern tree convert                             PARAMS ((tree, tree));
 174
 175 /* in c-decl.c */
 176 extern tree build_enumerator                    PARAMS ((tree, tree));
 177 /* Add qualifiers to a type, in the fashion for C.  */
 178 extern tree c_build_qualified_type              PARAMS ((tree, int));
 179 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P)           \
 180   c_build_qualified_type (TYPE,                                   \
 181                           ((CONST_P) ? TYPE_QUAL_CONST : 0) |     \
 182                           ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
 183 extern int  c_decode_option                     PARAMS ((int, char **));
 184 extern void c_mark_varargs                      PARAMS ((void));
 185 extern tree check_identifier                    PARAMS ((tree, tree));
 186 extern void clear_parm_order                    PARAMS ((void));
 187 extern tree combine_parm_decls                  PARAMS ((tree, tree, int));
 188 extern int  complete_array_type                 PARAMS ((tree, tree, int));
 189 extern void declare_parm_level                  PARAMS ((int));
 190 extern tree define_label                        PARAMS ((char *, int, tree));
 191 extern void delete_block                        PARAMS ((tree));
 192 extern void finish_decl                         PARAMS ((tree, tree, tree));
 193 extern void finish_decl_top_level               PARAMS ((tree, tree, tree));
 194 extern tree finish_enum                         PARAMS ((tree, tree, tree));
 195 extern void finish_function                     PARAMS ((int));
 196 extern tree finish_struct                       PARAMS ((tree, tree, tree));
 197 extern tree get_parm_info                       PARAMS ((int));
 198 extern tree getdecls                            PARAMS ((void));
 199 extern tree gettags                             PARAMS ((void));
 200 extern int  global_bindings_p                   PARAMS ((void));
 201 extern tree grokfield                           PARAMS ((const char *, int, tree, tree, tree));
 202 extern tree groktypename                        PARAMS ((tree));
 203 extern tree groktypename_in_parm_context        PARAMS ((tree));
 204 extern tree implicitly_declare                  PARAMS ((tree));
 205 extern int  in_parm_level_p                     PARAMS ((void));
 206 extern void init_decl_processing                PARAMS ((void));
 207 extern void insert_block                        PARAMS ((tree));
 208 extern void keep_next_level                     PARAMS ((void));
 209 extern int  kept_level_p                        PARAMS ((void));
 210 extern tree lookup_label                        PARAMS ((tree));
 211 extern tree lookup_name                         PARAMS ((tree));
 212 extern tree lookup_name_current_level           PARAMS ((tree));
 213 extern tree lookup_name_current_level_global    PARAMS ((tree));
 214 extern tree maybe_build_cleanup                 PARAMS ((tree));
 215 extern void parmlist_tags_warning               PARAMS ((void));
 216 extern void pending_xref_error                  PARAMS ((void));
 217 extern void mark_c_function_context             PARAMS ((struct function *));
 218 extern void push_c_function_context             PARAMS ((struct function *));
 219 extern void pop_c_function_context              PARAMS ((struct function *));
 220 extern void pop_label_level                     PARAMS ((void));
 221 extern tree poplevel                            PARAMS ((int, int, int));
 222 extern void print_lang_decl                     PARAMS ((FILE *, tree, int));
 223 extern void print_lang_identifier               PARAMS ((FILE *, tree, int));
 224 extern void print_lang_type                     PARAMS ((FILE *, tree, int));
 225 extern void push_label_level                    PARAMS ((void));
 226 extern void push_parm_decl                      PARAMS ((tree));
 227 extern tree pushdecl                            PARAMS ((tree));
 228 extern tree pushdecl_top_level                  PARAMS ((tree));
 229 extern void pushlevel                           PARAMS ((int));
 230 extern void pushtag                             PARAMS ((tree, tree));
 231 extern void set_block                           PARAMS ((tree));
 232 extern tree shadow_label                        PARAMS ((tree));
 233 extern void shadow_record_fields                PARAMS ((tree));
 234 extern void shadow_tag                          PARAMS ((tree));
 235 extern void shadow_tag_warned                   PARAMS ((tree, int));
 236 extern tree start_enum                          PARAMS ((tree));
 237 extern int  start_function                      PARAMS ((tree, tree, tree,
 238                                                          tree));
 239 extern tree start_decl                          PARAMS ((tree, tree, int,
 240                                                          tree, tree));
 241 extern tree start_struct                        PARAMS ((enum tree_code, tree));
 242 extern void store_parm_decls                    PARAMS ((void));
 243 extern tree xref_tag                            PARAMS ((enum tree_code, tree));
 244
 245 /* in c-typeck.c */
 246 extern tree require_complete_type               PARAMS ((tree));
 247 extern void incomplete_type_error               PARAMS ((tree, tree));
 248 /* Given two integer or real types, return the type for their sum.
 249    Given two compatible ANSI C types, returns the merged type.  */
 250 extern tree common_type                         PARAMS ((tree, tree));
 251 extern int comptypes                            PARAMS ((tree, tree));
 252 extern tree c_sizeof                            PARAMS ((tree));
 253 extern tree c_sizeof_nowarn                     PARAMS ((tree));
 254 extern tree c_size_in_bytes                     PARAMS ((tree));
 255 extern tree c_alignof                           PARAMS ((tree));
 256 extern tree c_alignof_expr                      PARAMS ((tree));
 257 extern tree default_conversion                  PARAMS ((tree));
 258 extern tree build_component_ref                 PARAMS ((tree, tree));
 259 extern tree build_indirect_ref                  PARAMS ((tree, const char *));
 260 extern tree build_array_ref                     PARAMS ((tree, tree));
 261 extern tree build_function_call                 PARAMS ((tree, tree));
 262 extern tree parser_build_binary_op              PARAMS ((enum tree_code,
 263                                                          tree, tree));
 264 extern tree build_binary_op                     PARAMS ((enum tree_code,
 265                                                          tree, tree, int));
 266 extern tree build_unary_op                      PARAMS ((enum tree_code,
 267                                                          tree, int));
 268 extern int lvalue_p                             PARAMS ((tree));
 269 extern int lvalue_or_else                       PARAMS ((tree, const char *));
 270 extern void readonly_warning                    PARAMS ((tree, const char *));
 271 extern int mark_addressable                     PARAMS ((tree));
 272 extern tree build_conditional_expr              PARAMS ((tree, tree, tree));
 273 extern tree build_compound_expr                 PARAMS ((tree));
 274 extern tree build_c_cast                        PARAMS ((tree, tree));
 275 extern tree build_modify_expr                   PARAMS ((tree, enum tree_code,
 276                                                          tree));
 277 extern void store_init_value                    PARAMS ((tree, tree));
 278 extern void error_init                          PARAMS ((const char *));
 279 extern void pedwarn_init                        PARAMS ((const char *));
 280 extern void start_init                          PARAMS ((tree, tree, int));
 281 extern void finish_init                         PARAMS ((void));
 282 extern void really_start_incremental_init       PARAMS ((tree));
 283 extern void push_init_level                     PARAMS ((int));
 284 extern tree pop_init_level                      PARAMS ((int));
 285 extern void set_init_index                      PARAMS ((tree, tree));
 286 extern void set_init_label                      PARAMS ((tree));
 287 extern void process_init_element                PARAMS ((tree));
 288 extern void c_expand_asm_operands               PARAMS ((tree, tree, tree,
 289                                                          tree, int, char *,
 290                                                          int));
 291 extern void c_expand_return                     PARAMS ((tree));
 292 extern tree c_expand_start_case                 PARAMS ((tree));
 293
 294 /* in c-iterate.c */
 295 extern void init_iterators                      PARAMS ((void));
 296 extern void iterator_expand                     PARAMS ((tree));
 297 extern void iterator_for_loop_start             PARAMS ((tree));
 298 extern void iterator_for_loop_end               PARAMS ((tree));
 299 extern void iterator_for_loop_record            PARAMS ((tree));
 300 extern void push_iterator_stack                 PARAMS ((void));
 301 extern void pop_iterator_stack                  PARAMS ((void));
 302
 303 /* Set to 0 at beginning of a function definition, set to 1 if
 304    a return statement that specifies a return value is seen.  */
 305
 306 extern int current_function_returns_value;
 307
 308 /* Set to 0 at beginning of a function definition, set to 1 if
 309    a return statement with no argument is seen.  */
 310
 311 extern int current_function_returns_null;
 312
 313 /* Nonzero means the expression being parsed will never be evaluated.
 314    This is a count, since unevaluated expressions can nest.  */
 315
 316 extern int skip_evaluation;
 317
 318 /* Nonzero means `$' can be in an identifier.  */
 319
 320 extern int dollars_in_ident;
 321
 322 /* Nonzero means allow type mismatches in conditional expressions;
 323    just make their values `void'.   */
 324
 325 extern int flag_cond_mismatch;
 326
 327 /* Nonzero means don't recognize the keyword `asm'.  */
 328
 329 extern int flag_no_asm;
 330
 331 /* Nonzero means environment is hosted (i.e., not freestanding) */
 332
 333 extern int flag_hosted;
 334
 335 /* Nonzero means warn about implicit declarations.  */
 336
 337 extern int warn_implicit;
 338
 339 /* Nonzero means give string constants the type `const char *'
 340    to get extra warnings from them.  These warnings will be too numerous
 341    to be useful, except in thoroughly ANSIfied programs.  */
 342
 343 extern int flag_const_strings;
 344
 345 /* Nonzero means warn about sizeof (function) or addition/subtraction
 346    of function pointers.  */
 347
 348 extern int warn_pointer_arith;
 349
 350 /* Nonzero means warn for all old-style non-prototype function decls.  */
 351
 352 extern int warn_strict_prototypes;
 353
 354 /* Nonzero means warn about multiple (redundant) decls for the same single
 355    variable or function.  */
 356
 357 extern int warn_redundant_decls;
 358
 359 /* Nonzero means warn about extern declarations of objects not at
 360    file-scope level and about *all* declarations of functions (whether
 361    extern or static) not at file-scope level.  Note that we exclude
 362    implicit function declarations.  To get warnings about those, use
 363    -Wimplicit.  */
 364
 365 extern int warn_nested_externs;
 366
 367 /* Nonzero means warn about pointer casts that can drop a type qualifier
 368    from the pointer target type.  */
 369
 370 extern int warn_cast_qual;
 371
 372 /* Nonzero means warn when casting a function call to a type that does
 373    not match the return type (e.g. (float)sqrt() or (anything*)malloc()
 374    when there is no previous declaration of sqrt or malloc.  */
 375
 376 extern int warn_bad_function_cast;
 377
 378 /* Warn about functions which might be candidates for attribute noreturn. */
 379
 380 extern int warn_missing_noreturn;
 381
 382 /* Warn about traditional constructs whose meanings changed in ANSI C.  */
 383
 384 extern int warn_traditional;
 385
 386 /* Warn about *printf or *scanf format/argument anomalies. */
 387
 388 extern int warn_format;
 389
 390 /* Warn about a subscript that has type char.  */
 391
 392 extern int warn_char_subscripts;
 393
 394 /* Warn if a type conversion is done that might have confusing results.  */
 395
 396 extern int warn_conversion;
 397
 398 /* Warn if main is suspicious. */
 399
 400 extern int warn_main;
 401
 402 /* Nonzero means do some things the same way PCC does.  */
 403
 404 extern int flag_traditional;
 405
 406 /* Nonzero means use the ISO C99 dialect of C.  */
 407
 408 extern int flag_isoc99;
 409
 410 /* Nonzero means to allow single precision math even if we're generally
 411    being traditional. */
 412 extern int flag_allow_single_precision;
 413
 414 /* Nonzero means warn about suggesting putting in ()'s.  */
 415
 416 extern int warn_parentheses;
 417
 418 /* Warn if initializer is not completely bracketed.  */
 419
 420 extern int warn_missing_braces;
 421
 422 /* Warn about comparison of signed and unsigned values.  */
 423
 424 extern int warn_sign_compare;
 425
 426 /* Warn about testing equality of floating point numbers. */
 427
 428 extern int warn_float_equal;
 429
 430 /* Warn about multicharacter constants.  */
 431
 432 extern int warn_multichar;
 433
 434 /* Warn about long long.  */
 435
 436 extern int warn_long_long;
 437
 438 /* Nonzero means we are reading code that came from a system header file.  */
 439
 440 extern int system_header_p;
 441
 442 /* Nonzero enables objc features.  */
 443
 444 extern int doing_objc_thang;
 445
 446 /* In c-decl.c */
 447 extern void finish_incomplete_decl PARAMS ((tree));
 448
 449 #endif /* not _C_TREE_H */