gcc/c-tree.h

   1 /* Definitions for C parsing and type checking.
   2    Copyright (C) 1987, 93, 94, 95, 97, 98, 1999 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 /* Nonzero if the type T promotes to itself.
 149    ANSI C states explicitly the list of types that promote;
 150    in particular, short promotes to int even if they have the same width.  */
 151 #define C_PROMOTING_INTEGER_TYPE_P(t)                           \
 152   (TREE_CODE ((t)) == INTEGER_TYPE                              \
 153    && (TYPE_MAIN_VARIANT (t) == char_type_node                  \
 154        || TYPE_MAIN_VARIANT (t) == signed_char_type_node        \
 155        || TYPE_MAIN_VARIANT (t) == unsigned_char_type_node      \
 156        || TYPE_MAIN_VARIANT (t) == short_integer_type_node      \
 157        || TYPE_MAIN_VARIANT (t) == short_unsigned_type_node))
 158
 159 /* In a VAR_DECL, means the variable is really an iterator.  */
 160 #define ITERATOR_P(D) (DECL_LANG_FLAG_4(D))
 161
 162 /* In a VAR_DECL for an iterator, means we are within
 163    an explicit loop over that iterator.  */
 164 #define ITERATOR_BOUND_P(NODE) ((NODE)->common.readonly_flag)
 165 \f
 166 /* in c-lang.c and objc-act.c */
 167 extern tree lookup_interface                    PROTO((tree));
 168 extern tree is_class_name                       PROTO((tree));
 169 extern void maybe_objc_check_decl               PROTO((tree));
 170 extern void finish_file                         PROTO((void));
 171 extern int maybe_objc_comptypes                 PROTO((tree, tree, int));
 172 extern tree maybe_building_objc_message_expr    PROTO((void));
 173 extern tree maybe_objc_method_name              PROTO((tree));
 174 extern int recognize_objc_keyword               PROTO((void));
 175 extern tree build_objc_string                   PROTO((int, const char *));
 176 \f
 177 /* in c-aux-info.c */
 178 extern void gen_aux_info_record                 PROTO((tree, int, int, int));
 179
 180 /* in c-convert.c */
 181 extern tree convert                             PROTO((tree, tree));
 182
 183 /* in c-decl.c */
 184 extern tree build_enumerator                    PROTO((tree, tree));
 185 /* Add qualifiers to a type, in the fashion for C.  */
 186 extern tree c_build_qualified_type              PROTO((tree, int));
 187 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P)           \
 188   c_build_qualified_type (TYPE,                                   \
 189                           ((CONST_P) ? TYPE_QUAL_CONST : 0) |     \
 190                           ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
 191 extern int  c_decode_option                     PROTO((int, char **));
 192 extern void c_mark_varargs                      PROTO((void));
 193 extern tree check_identifier                    PROTO((tree, tree));
 194 extern void clear_parm_order                    PROTO((void));
 195 extern tree combine_parm_decls                  PROTO((tree, tree, int));
 196 extern int  complete_array_type                 PROTO((tree, tree, int));
 197 extern void declare_parm_level                  PROTO((int));
 198 extern tree define_label                        PROTO((char *, int, tree));
 199 extern void delete_block                        PROTO((tree));
 200 extern void finish_decl                         PROTO((tree, tree, tree));
 201 extern void finish_decl_top_level               PROTO((tree, tree, tree));
 202 extern tree finish_enum                         PROTO((tree, tree, tree));
 203 extern void finish_function                     PROTO((int));
 204 extern tree finish_struct                       PROTO((tree, tree, tree));
 205 extern tree get_parm_info                       PROTO((int));
 206 extern tree getdecls                            PROTO((void));
 207 extern tree gettags                             PROTO((void));
 208 extern int  global_bindings_p                   PROTO((void));
 209 extern tree grokfield                           PROTO((const char *, int, tree, tree, tree));
 210 extern tree groktypename                        PROTO((tree));
 211 extern tree groktypename_in_parm_context        PROTO((tree));
 212 extern tree implicitly_declare                  PROTO((tree));
 213 extern int  in_parm_level_p                     PROTO((void));
 214 extern void init_decl_processing                PROTO((void));
 215 extern void insert_block                        PROTO((tree));
 216 extern void keep_next_level                     PROTO((void));
 217 extern int  kept_level_p                        PROTO((void));
 218 extern tree lookup_label                        PROTO((tree));
 219 extern tree lookup_name                         PROTO((tree));
 220 extern tree lookup_name_current_level           PROTO((tree));
 221 extern tree lookup_name_current_level_global    PROTO((tree));
 222 extern tree maybe_build_cleanup                 PROTO((tree));
 223 extern void parmlist_tags_warning               PROTO((void));
 224 extern void pending_xref_error                  PROTO((void));
 225 extern void pop_c_function_context              PROTO((void));
 226 extern void pop_label_level                     PROTO((void));
 227 extern tree poplevel                            PROTO((int, int, int));
 228 extern void print_lang_decl                     PROTO((FILE *, tree, int));
 229 extern void print_lang_identifier               PROTO((FILE *, tree, int));
 230 extern void print_lang_type                     PROTO((FILE *, tree, int));
 231 extern void push_c_function_context             PROTO((void));
 232 extern void push_label_level                    PROTO((void));
 233 extern void push_parm_decl                      PROTO((tree));
 234 extern tree pushdecl                            PROTO((tree));
 235 extern tree pushdecl_top_level                  PROTO((tree));
 236 extern void pushlevel                           PROTO((int));
 237 extern void pushtag                             PROTO((tree, tree));
 238 extern void set_block                           PROTO((tree));
 239 extern tree shadow_label                        PROTO((tree));
 240 extern void shadow_record_fields                PROTO((tree));
 241 extern void shadow_tag                          PROTO((tree));
 242 extern void shadow_tag_warned                   PROTO((tree, int));
 243 extern tree start_enum                          PROTO((tree));
 244 extern int  start_function                      PROTO((tree, tree, tree,
 245                                                        tree, int));
 246 extern tree start_decl                          PROTO((tree, tree, int,
 247                                                        tree, tree));
 248 extern tree start_struct                        PROTO((enum tree_code, tree));
 249 extern void store_parm_decls                    PROTO((void));
 250 extern tree xref_tag                            PROTO((enum tree_code, tree));
 251
 252 /* in c-typeck.c */
 253 extern tree require_complete_type               PROTO((tree));
 254 extern void incomplete_type_error               PROTO((tree, tree));
 255 /* Given two integer or real types, return the type for their sum.
 256    Given two compatible ANSI C types, returns the merged type.  */
 257 extern tree common_type                         PROTO((tree, tree));
 258 extern int comptypes                            PROTO((tree, tree));
 259 extern int self_promoting_args_p                PROTO((tree));
 260 extern tree c_sizeof                            PROTO((tree));
 261 extern tree c_sizeof_nowarn                     PROTO((tree));
 262 extern tree c_size_in_bytes                     PROTO((tree));
 263 extern tree c_alignof                           PROTO((tree));
 264 extern tree c_alignof_expr                      PROTO((tree));
 265 extern tree default_conversion                  PROTO((tree));
 266 extern tree build_component_ref                 PROTO((tree, tree));
 267 extern tree build_indirect_ref                  PROTO((tree, const char *));
 268 extern tree build_array_ref                     PROTO((tree, tree));
 269 extern tree build_function_call                 PROTO((tree, tree));
 270 extern tree parser_build_binary_op              PROTO((enum tree_code,
 271                                                        tree, tree));
 272 extern tree build_binary_op                     PROTO((enum tree_code,
 273                                                        tree, tree, int));
 274 extern tree build_unary_op                      PROTO((enum tree_code,
 275                                                        tree, int));
 276 extern int lvalue_p                             PROTO((tree));
 277 extern int lvalue_or_else                       PROTO((tree, const char *));
 278 extern void readonly_warning                    PROTO((tree, const char *));
 279 extern int mark_addressable                     PROTO((tree));
 280 extern tree build_conditional_expr              PROTO((tree, tree, tree));
 281 extern tree build_compound_expr                 PROTO((tree));
 282 extern tree build_c_cast                        PROTO((tree, tree));
 283 extern tree build_modify_expr                   PROTO((tree, enum tree_code,
 284                                                        tree));
 285 extern void store_init_value                    PROTO((tree, tree));
 286 extern void error_init                          PROTO((const char *));
 287 extern void pedwarn_init                        PROTO((const char *));
 288 extern void start_init                          PROTO((tree, tree, int));
 289 extern void finish_init                         PROTO((void));
 290 extern void really_start_incremental_init       PROTO((tree));
 291 extern void push_init_level                     PROTO((int));
 292 extern tree pop_init_level                      PROTO((int));
 293 extern void set_init_index                      PROTO((tree, tree));
 294 extern void set_init_label                      PROTO((tree));
 295 extern void process_init_element                PROTO((tree));
 296 extern void c_expand_asm_operands               PROTO((tree, tree, tree, tree,
 297                                                        int, char *, int));
 298 extern void c_expand_return                     PROTO((tree));
 299 extern tree c_expand_start_case                 PROTO((tree));
 300
 301 /* in c-iterate.c */
 302 extern void init_iterators                      PROTO((void));
 303 extern void iterator_expand                     PROTO((tree));
 304 extern void iterator_for_loop_start             PROTO((tree));
 305 extern void iterator_for_loop_end               PROTO((tree));
 306 extern void iterator_for_loop_record            PROTO((tree));
 307 extern void push_iterator_stack                 PROTO((void));
 308 extern void pop_iterator_stack                  PROTO((void));
 309
 310 /* Set to 0 at beginning of a function definition, set to 1 if
 311    a return statement that specifies a return value is seen.  */
 312
 313 extern int current_function_returns_value;
 314
 315 /* Set to 0 at beginning of a function definition, set to 1 if
 316    a return statement with no argument is seen.  */
 317
 318 extern int current_function_returns_null;
 319
 320 /* Nonzero means the expression being parsed will never be evaluated.
 321    This is a count, since unevaluated expressions can nest.  */
 322
 323 extern int skip_evaluation;
 324
 325 /* Nonzero means `$' can be in an identifier.  */
 326
 327 extern int dollars_in_ident;
 328
 329 /* Nonzero means allow type mismatches in conditional expressions;
 330    just make their values `void'.   */
 331
 332 extern int flag_cond_mismatch;
 333
 334 /* Nonzero means don't recognize the keyword `asm'.  */
 335
 336 extern int flag_no_asm;
 337
 338 /* Nonzero means environment is hosted (i.e., not freestanding) */
 339
 340 extern int flag_hosted;
 341
 342 /* Nonzero means warn about implicit declarations.  */
 343
 344 extern int warn_implicit;
 345
 346 /* Nonzero means give string constants the type `const char *'
 347    to get extra warnings from them.  These warnings will be too numerous
 348    to be useful, except in thoroughly ANSIfied programs.  */
 349
 350 extern int flag_const_strings;
 351
 352 /* Nonzero means warn about sizeof (function) or addition/subtraction
 353    of function pointers.  */
 354
 355 extern int warn_pointer_arith;
 356
 357 /* Nonzero means warn for all old-style non-prototype function decls.  */
 358
 359 extern int warn_strict_prototypes;
 360
 361 /* Nonzero means warn about multiple (redundant) decls for the same single
 362    variable or function.  */
 363
 364 extern int warn_redundant_decls;
 365
 366 /* Nonzero means warn about extern declarations of objects not at
 367    file-scope level and about *all* declarations of functions (whether
 368    extern or static) not at file-scope level.  Note that we exclude
 369    implicit function declarations.  To get warnings about those, use
 370    -Wimplicit.  */
 371
 372 extern int warn_nested_externs;
 373
 374 /* Nonzero means warn about pointer casts that can drop a type qualifier
 375    from the pointer target type.  */
 376
 377 extern int warn_cast_qual;
 378
 379 /* Nonzero means warn when casting a function call to a type that does
 380    not match the return type (e.g. (float)sqrt() or (anything*)malloc()
 381    when there is no previous declaration of sqrt or malloc.  */
 382
 383 extern int warn_bad_function_cast;
 384
 385 /* Warn about functions which might be candidates for attribute noreturn. */
 386
 387 extern int warn_missing_noreturn;
 388
 389 /* Warn about traditional constructs whose meanings changed in ANSI C.  */
 390
 391 extern int warn_traditional;
 392
 393 /* Warn about *printf or *scanf format/argument anomalies. */
 394
 395 extern int warn_format;
 396
 397 /* Warn about a subscript that has type char.  */
 398
 399 extern int warn_char_subscripts;
 400
 401 /* Warn if a type conversion is done that might have confusing results.  */
 402
 403 extern int warn_conversion;
 404
 405 /* Warn if main is suspicious. */
 406
 407 extern int warn_main;
 408
 409 /* Nonzero means do some things the same way PCC does.  */
 410
 411 extern int flag_traditional;
 412
 413 /* Nonzero means use the ISO C9x dialect of C.  */
 414
 415 extern int flag_isoc9x;
 416
 417 /* Nonzero means to allow single precision math even if we're generally
 418    being traditional. */
 419 extern int flag_allow_single_precision;
 420
 421 /* Nonzero means warn about suggesting putting in ()'s.  */
 422
 423 extern int warn_parentheses;
 424
 425 /* Warn if initializer is not completely bracketed.  */
 426
 427 extern int warn_missing_braces;
 428
 429 /* Warn about comparison of signed and unsigned values.  */
 430
 431 extern int warn_sign_compare;
 432
 433 /* Warn about multicharacter constants.  */
 434
 435 extern int warn_multichar;
 436
 437 /* Warn about long long.  */
 438
 439 extern int warn_long_long;
 440
 441 /* Nonzero means we are reading code that came from a system header file.  */
 442
 443 extern int system_header_p;
 444
 445 /* Nonzero enables objc features.  */
 446
 447 extern int doing_objc_thang;
 448
 449 /* In c-decl.c */
 450 extern void finish_incomplete_decl PROTO((tree));
 451
 452 #endif /* not _C_TREE_H */