gcc/c-tree.h

   1 /* Definitions for C parsing and type checking.
   2    Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998,
   3    1999, 2000 Free Software Foundation, Inc.
   4
   5 This file is part of GNU CC.
   6
   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)
  10 any later version.
  11
  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.
  16
  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.  */
  21
  22 #ifndef _C_TREE_H
  23 #define _C_TREE_H
  24
  25 #include "c-common.h"
  26
  27 /* Language-dependent contents of an identifier.  */
  28
  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.  */
  32
  33 struct lang_identifier
  34 {
  35   struct tree_identifier ignore;
  36   tree global_value, local_value, label_value, implicit_decl;
  37   tree error_locus, limbo_value;
  38 };
  39
  40 /* Macros for access to language-specific slots in an identifier.  */
  41 /* Each of these slots contains a DECL node or null.  */
  42
  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
  48    scope.  */
  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)
  67
  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.  */
  72
  73 /* Nonzero means reject anything that ANSI standard C forbids.  */
  74 extern int pedantic;
  75
  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)
  78
  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)
  81
  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)
  85
  86 /* In a RECORD_TYPE, a sorted array of the fields of the type.  */
  87 struct lang_type
  88 {
  89   int len;
  90   tree elts[1];
  91 };
  92
  93 /* Mark which labels are explicitly declared.
  94    These may be shadowed, and may be referenced from nested functions.  */
  95 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
  96
  97 /* Record whether a type or decl was written with nonconstant size.
  98    Note that TYPE_SIZE may have simplified to a constant.  */
  99 #define C_TYPE_VARIABLE_SIZE(type) TYPE_LANG_FLAG_1 (type)
 100 #define C_DECL_VARIABLE_SIZE(type) DECL_LANG_FLAG_0 (type)
 101
 102 #if 0 /* Not used.  */
 103 /* Record whether a decl for a function or function pointer has
 104    already been mentioned (in a warning) because it was called
 105    but didn't have a prototype.  */
 106 #define C_MISSING_PROTOTYPE_WARNED(decl) DECL_LANG_FLAG_2(decl)
 107 #endif
 108
 109 /* Store a value in that field.  */
 110 #define C_SET_EXP_ORIGINAL_CODE(exp, code) \
 111   (TREE_COMPLEXITY (exp) = (int) (code))
 112
 113 /* Record whether a typedef for type `int' was actually `signed int'.  */
 114 #define C_TYPEDEF_EXPLICITLY_SIGNED(exp) DECL_LANG_FLAG_1 ((exp))
 115
 116 /* Nonzero for a declaration of a built in function if there has been no
 117    occasion that would declare the function in ordinary C.
 118    Using the function draws a pedantic warning in this case.  */
 119 #define C_DECL_ANTICIPATED(exp) DECL_LANG_FLAG_3 ((exp))
 120
 121 /* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
 122    TYPE_ARG_TYPES for functions with prototypes, but created for functions
 123    without prototypes.  */
 124 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_NONCOPIED_PARTS (NODE)
 125
 126 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
 127 #define DECL_C_BIT_FIELD(NODE) DECL_LANG_FLAG_4 (NODE)
 128
 129 /* In a VAR_DECL, means the variable is really an iterator.  */
 130 #define ITERATOR_P(D) (DECL_LANG_FLAG_4(D))
 131
 132 /* In a VAR_DECL for an iterator, means we are within
 133    an explicit loop over that iterator.  */
 134 #define ITERATOR_BOUND_P(NODE) ((NODE)->common.readonly_flag)
 135 \f
 136 /* in c-lang.c and objc-act.c */
 137 extern tree lookup_interface                    PARAMS ((tree));
 138 extern tree is_class_name                       PARAMS ((tree));
 139 extern void maybe_objc_check_decl               PARAMS ((tree));
 140 extern void finish_file                         PARAMS ((void));
 141 extern int maybe_objc_comptypes                 PARAMS ((tree, tree, int));
 142 extern tree maybe_building_objc_message_expr    PARAMS ((void));
 143 extern tree maybe_objc_method_name              PARAMS ((tree));
 144 extern int recognize_objc_keyword               PARAMS ((void));
 145 extern tree build_objc_string                   PARAMS ((int, const char *));
 146 extern tree lookup_objc_ivar                    PARAMS ((tree));
 147 \f
 148 /* in c-parse.in */
 149 extern void c_parse_init                        PARAMS ((void));
 150
 151 /* in c-aux-info.c */
 152 extern void gen_aux_info_record                 PARAMS ((tree, int, int, int));
 153
 154 /* in c-convert.c */
 155 extern tree convert                             PARAMS ((tree, tree));
 156
 157 /* in c-decl.c */
 158 extern tree build_enumerator                    PARAMS ((tree, tree));
 159
 160 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P)           \
 161   c_build_qualified_type (TYPE,                                   \
 162                           ((CONST_P) ? TYPE_QUAL_CONST : 0) |     \
 163                           ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
 164 extern int  c_decode_option                     PARAMS ((int, char **));
 165 extern void c_mark_varargs                      PARAMS ((void));
 166 extern tree check_identifier                    PARAMS ((tree, tree));
 167 extern void clear_parm_order                    PARAMS ((void));
 168 extern tree combine_parm_decls                  PARAMS ((tree, tree, int));
 169 extern int  complete_array_type                 PARAMS ((tree, tree, int));
 170 extern void declare_parm_level                  PARAMS ((int));
 171 extern tree define_label                        PARAMS ((const char *, int,
 172                                                          tree));
 173 extern void delete_block                        PARAMS ((tree));
 174 extern void finish_decl                         PARAMS ((tree, tree, tree));
 175 extern void finish_decl_top_level               PARAMS ((tree, tree, tree));
 176 extern tree finish_enum                         PARAMS ((tree, tree, tree));
 177 extern void finish_function                     PARAMS ((int));
 178 extern tree finish_struct                       PARAMS ((tree, tree, tree));
 179 extern tree get_parm_info                       PARAMS ((int));
 180 extern tree getdecls                            PARAMS ((void));
 181 extern tree gettags                             PARAMS ((void));
 182 extern int  global_bindings_p                   PARAMS ((void));
 183 extern tree grokfield                           PARAMS ((const char *, int, tree, tree, tree));
 184 extern tree groktypename                        PARAMS ((tree));
 185 extern tree groktypename_in_parm_context        PARAMS ((tree));
 186 extern tree implicitly_declare                  PARAMS ((tree));
 187 extern void implicit_decl_warning               PARAMS ((tree));
 188 extern int  in_parm_level_p                     PARAMS ((void));
 189 extern void init_decl_processing                PARAMS ((void));
 190 extern void insert_block                        PARAMS ((tree));
 191 extern void keep_next_level                     PARAMS ((void));
 192 extern int  kept_level_p                        PARAMS ((void));
 193 extern tree lookup_label                        PARAMS ((tree));
 194 extern tree lookup_name                         PARAMS ((tree));
 195 extern tree lookup_name_current_level           PARAMS ((tree));
 196 extern tree lookup_name_current_level_global    PARAMS ((tree));
 197 extern tree maybe_build_cleanup                 PARAMS ((tree));
 198 extern void parmlist_tags_warning               PARAMS ((void));
 199 extern void pending_xref_error                  PARAMS ((void));
 200 extern void mark_c_function_context             PARAMS ((struct function *));
 201 extern void push_c_function_context             PARAMS ((struct function *));
 202 extern void pop_c_function_context              PARAMS ((struct function *));
 203 extern void pop_label_level                     PARAMS ((void));
 204 extern tree poplevel                            PARAMS ((int, int, int));
 205 extern void print_lang_decl                     PARAMS ((FILE *, tree, int));
 206 extern void print_lang_identifier               PARAMS ((FILE *, tree, int));
 207 extern void print_lang_type                     PARAMS ((FILE *, tree, int));
 208 extern void push_label_level                    PARAMS ((void));
 209 extern void push_parm_decl                      PARAMS ((tree));
 210 extern tree pushdecl                            PARAMS ((tree));
 211 extern tree pushdecl_top_level                  PARAMS ((tree));
 212 extern void pushlevel                           PARAMS ((int));
 213 extern void pushtag                             PARAMS ((tree, tree));
 214 extern void set_block                           PARAMS ((tree));
 215 extern tree shadow_label                        PARAMS ((tree));
 216 extern void shadow_record_fields                PARAMS ((tree));
 217 extern void shadow_tag                          PARAMS ((tree));
 218 extern void shadow_tag_warned                   PARAMS ((tree, int));
 219 extern tree start_enum                          PARAMS ((tree));
 220 extern int  start_function                      PARAMS ((tree, tree, tree,
 221                                                          tree));
 222 extern tree start_decl                          PARAMS ((tree, tree, int,
 223                                                          tree, tree));
 224 extern tree start_struct                        PARAMS ((enum tree_code, tree));
 225 extern void store_parm_decls                    PARAMS ((void));
 226 extern tree xref_tag                            PARAMS ((enum tree_code, tree));
 227
 228 /* in c-typeck.c */
 229 extern tree require_complete_type               PARAMS ((tree));
 230 extern void incomplete_type_error               PARAMS ((tree, tree));
 231 extern int comptypes                            PARAMS ((tree, tree));
 232 extern tree c_sizeof                            PARAMS ((tree));
 233 extern tree c_sizeof_nowarn                     PARAMS ((tree));
 234 extern tree c_size_in_bytes                     PARAMS ((tree));
 235 extern tree c_alignof                           PARAMS ((tree));
 236 extern tree c_alignof_expr                      PARAMS ((tree));
 237 extern tree build_component_ref                 PARAMS ((tree, tree));
 238 extern tree build_indirect_ref                  PARAMS ((tree, const char *));
 239 extern tree build_array_ref                     PARAMS ((tree, tree));
 240 extern tree build_external_ref                  PARAMS ((tree, int));
 241 extern tree build_function_call                 PARAMS ((tree, tree));
 242 extern tree parser_build_binary_op              PARAMS ((enum tree_code,
 243                                                          tree, tree));
 244 extern int lvalue_or_else                       PARAMS ((tree, const char *));
 245 extern void readonly_warning                    PARAMS ((tree, const char *));
 246 extern int mark_addressable                     PARAMS ((tree));
 247 extern tree build_conditional_expr              PARAMS ((tree, tree, tree));
 248 extern tree build_compound_expr                 PARAMS ((tree));
 249 extern tree build_c_cast                        PARAMS ((tree, tree));
 250 extern tree build_modify_expr                   PARAMS ((tree, enum tree_code,
 251                                                          tree));
 252 extern void store_init_value                    PARAMS ((tree, tree));
 253 extern void error_init                          PARAMS ((const char *));
 254 extern void pedwarn_init                        PARAMS ((const char *));
 255 extern void start_init                          PARAMS ((tree, tree, int));
 256 extern void finish_init                         PARAMS ((void));
 257 extern void really_start_incremental_init       PARAMS ((tree));
 258 extern void push_init_level                     PARAMS ((int));
 259 extern tree pop_init_level                      PARAMS ((int));
 260 extern void set_init_index                      PARAMS ((tree, tree));
 261 extern void set_init_label                      PARAMS ((tree));
 262 extern void process_init_element                PARAMS ((tree));
 263 extern void pedwarn_c99                         PARAMS ((const char *, ...))
 264                                                         ATTRIBUTE_PRINTF_1;
 265
 266 /* in c-iterate.c */
 267 extern void init_iterators                      PARAMS ((void));
 268 extern void iterator_expand                     PARAMS ((tree));
 269 extern void iterator_for_loop_start             PARAMS ((tree));
 270 extern void iterator_for_loop_end               PARAMS ((tree));
 271 extern void iterator_for_loop_record            PARAMS ((tree));
 272 extern void push_iterator_stack                 PARAMS ((void));
 273 extern void pop_iterator_stack                  PARAMS ((void));
 274
 275 /* Set to 0 at beginning of a function definition, set to 1 if
 276    a return statement that specifies a return value is seen.  */
 277
 278 extern int current_function_returns_value;
 279
 280 /* Set to 0 at beginning of a function definition, set to 1 if
 281    a return statement with no argument is seen.  */
 282
 283 extern int current_function_returns_null;
 284
 285 /* Nonzero means the expression being parsed will never be evaluated.
 286    This is a count, since unevaluated expressions can nest.  */
 287
 288 extern int skip_evaluation;
 289
 290 /* Nonzero means `$' can be in an identifier.  */
 291
 292 extern int dollars_in_ident;
 293
 294 /* Nonzero means allow type mismatches in conditional expressions;
 295    just make their values `void'.   */
 296
 297 extern int flag_cond_mismatch;
 298
 299 /* Nonzero means don't recognize the keyword `asm'.  */
 300
 301 extern int flag_no_asm;
 302
 303 /* Nonzero means environment is hosted (i.e., not freestanding) */
 304
 305 extern int flag_hosted;
 306
 307 /* Nonzero means warn about implicit declarations.  */
 308
 309 extern int warn_implicit;
 310
 311 /* Nonzero means warn about sizeof (function) or addition/subtraction
 312    of function pointers.  */
 313
 314 extern int warn_pointer_arith;
 315
 316 /* Nonzero means warn for all old-style non-prototype function decls.  */
 317
 318 extern int warn_strict_prototypes;
 319
 320 /* Nonzero means warn about multiple (redundant) decls for the same single
 321    variable or function.  */
 322
 323 extern int warn_redundant_decls;
 324
 325 /* Nonzero means warn about extern declarations of objects not at
 326    file-scope level and about *all* declarations of functions (whether
 327    extern or static) not at file-scope level.  Note that we exclude
 328    implicit function declarations.  To get warnings about those, use
 329    -Wimplicit.  */
 330
 331 extern int warn_nested_externs;
 332
 333 /* Nonzero means warn about pointer casts that can drop a type qualifier
 334    from the pointer target type.  */
 335
 336 extern int warn_cast_qual;
 337
 338 /* Nonzero means warn when casting a function call to a type that does
 339    not match the return type (e.g. (float)sqrt() or (anything*)malloc()
 340    when there is no previous declaration of sqrt or malloc.  */
 341
 342 extern int warn_bad_function_cast;
 343
 344 /* Warn about functions which might be candidates for attribute noreturn. */
 345
 346 extern int warn_missing_noreturn;
 347
 348 /* Warn about traditional constructs whose meanings changed in ANSI C.  */
 349
 350 extern int warn_traditional;
 351
 352 /* Warn about a subscript that has type char.  */
 353
 354 extern int warn_char_subscripts;
 355
 356 /* Warn if main is suspicious. */
 357
 358 extern int warn_main;
 359
 360 /* Nonzero means to allow single precision math even if we're generally
 361    being traditional. */
 362 extern int flag_allow_single_precision;
 363
 364 /* Warn if initializer is not completely bracketed.  */
 365
 366 extern int warn_missing_braces;
 367
 368 /* Warn about comparison of signed and unsigned values.  */
 369
 370 extern int warn_sign_compare;
 371
 372 /* Warn about testing equality of floating point numbers. */
 373
 374 extern int warn_float_equal;
 375
 376 /* Warn about multicharacter constants.  */
 377
 378 extern int warn_multichar;
 379
 380 /* Warn about long long.  */
 381
 382 extern int warn_long_long;
 383
 384 /* Nonzero means we are reading code that came from a system header file.  */
 385
 386 extern int system_header_p;
 387
 388 /* Warn about implicit declarations.  1 = warning, 2 = error.  */
 389 extern int mesg_implicit_function_declaration;
 390
 391 /* Nonzero enables objc features.  */
 392
 393 #define doing_objc_thang \
 394   (c_language == clk_objective_c)
 395
 396 /* In c-decl.c */
 397 extern void finish_incomplete_decl PARAMS ((tree));
 398
 399 #endif /* not _C_TREE_H */