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    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.  */
  36
  37 struct lang_identifier
  38 {
  39   struct tree_identifier ignore;
  40   tree global_value, local_value, label_value, implicit_decl;
  41   tree error_locus, limbo_value;
  42   enum rid rid_code;
  43 };
  44
  45 /* Language-specific declaration information.  */
  46
  47 struct lang_decl
  48 {
  49   struct c_lang_decl base;
  50   /* The return types and parameter types may have variable size.
  51      This is a list of any SAVE_EXPRs that need to be evaluated to
  52      compute those sizes.  */
  53   tree pending_sizes;
  54 };
  55
  56 /* Macros for access to language-specific slots in an identifier.  */
  57 /* Each of these slots contains a DECL node or null.  */
  58
  59 /* This represents the value which the identifier has in the
  60    file-scope namespace.  */
  61 #define IDENTIFIER_GLOBAL_VALUE(NODE)   \
  62   (((struct lang_identifier *) (NODE))->global_value)
  63 /* This represents the value which the identifier has in the current
  64    scope.  */
  65 #define IDENTIFIER_LOCAL_VALUE(NODE)    \
  66   (((struct lang_identifier *) (NODE))->local_value)
  67 /* This represents the value which the identifier has as a label in
  68    the current label scope.  */
  69 #define IDENTIFIER_LABEL_VALUE(NODE)    \
  70   (((struct lang_identifier *) (NODE))->label_value)
  71 /* This records the extern decl of this identifier, if it has had one
  72    at any point in this compilation.  */
  73 #define IDENTIFIER_LIMBO_VALUE(NODE)    \
  74   (((struct lang_identifier *) (NODE))->limbo_value)
  75 /* This records the implicit function decl of this identifier, if it
  76    has had one at any point in this compilation.  */
  77 #define IDENTIFIER_IMPLICIT_DECL(NODE)  \
  78   (((struct lang_identifier *) (NODE))->implicit_decl)
  79 /* This is the last function in which we printed an "undefined variable"
  80    message for this identifier.  Value is a FUNCTION_DECL or null.  */
  81 #define IDENTIFIER_ERROR_LOCUS(NODE)    \
  82   (((struct lang_identifier *) (NODE))->error_locus)
  83
  84 /* In identifiers, C uses the following fields in a special way:
  85    TREE_PUBLIC        to record that there was a previous local extern decl.
  86    TREE_USED          to record that such a decl was used.
  87    TREE_ADDRESSABLE   to record that the address of such a decl was used.  */
  88
  89 /* Nonzero means reject anything that ANSI standard C forbids.  */
  90 extern int pedantic;
  91
  92 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only.  */
  93 #define C_TYPE_FIELDS_READONLY(type) TREE_LANG_FLAG_1 (type)
  94
  95 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile.  */
  96 #define C_TYPE_FIELDS_VOLATILE(type) TREE_LANG_FLAG_2 (type)
  97
  98 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
  99    nonzero if the definition of the type has already started.  */
 100 #define C_TYPE_BEING_DEFINED(type) TYPE_LANG_FLAG_0 (type)
 101
 102 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
 103    keyword.  C_RID_CODE (node) is then the RID_* value of the keyword,
 104    and C_RID_YYCODE is the token number wanted by Yacc.  */
 105
 106 #define C_IS_RESERVED_WORD(id) TREE_LANG_FLAG_0 (id)
 107 #define C_RID_CODE(id) \
 108   (((struct lang_identifier *) (id))->rid_code)
 109
 110 /* In a RECORD_TYPE, a sorted array of the fields of the type.  */
 111 struct lang_type
 112 {
 113   int len;
 114   tree elts[1];
 115 };
 116
 117 /* Record whether a type or decl was written with nonconstant size.
 118    Note that TYPE_SIZE may have simplified to a constant.  */
 119 #define C_TYPE_VARIABLE_SIZE(type) TYPE_LANG_FLAG_1 (type)
 120 #define C_DECL_VARIABLE_SIZE(type) DECL_LANG_FLAG_0 (type)
 121
 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)
 127 #endif
 128
 129 /* Store a value in that field.  */
 130 #define C_SET_EXP_ORIGINAL_CODE(exp, code) \
 131   (TREE_COMPLEXITY (exp) = (int) (code))
 132
 133 /* Record whether a typedef for type `int' was actually `signed int'.  */
 134 #define C_TYPEDEF_EXPLICITLY_SIGNED(exp) DECL_LANG_FLAG_1 ((exp))
 135
 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))
 140
 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)
 145
 146 \f
 147 /* in c-lang.c and objc-act.c */
 148 extern tree lookup_interface                    PARAMS ((tree));
 149 extern tree is_class_name                       PARAMS ((tree));
 150 extern void maybe_objc_check_decl               PARAMS ((tree));
 151 extern void finish_file                         PARAMS ((void));
 152 extern int maybe_objc_comptypes                 PARAMS ((tree, tree, int));
 153 extern tree maybe_building_objc_message_expr    PARAMS ((void));
 154 extern tree maybe_objc_method_name              PARAMS ((tree));
 155 extern int recognize_objc_keyword               PARAMS ((void));
 156 extern tree lookup_objc_ivar                    PARAMS ((tree));
 157 \f
 158 /* in c-parse.in */
 159 extern void c_parse_init                        PARAMS ((void));
 160 extern int yyparse_1                            PARAMS ((void));
 161
 162 /* in c-aux-info.c */
 163 extern void gen_aux_info_record                 PARAMS ((tree, int, int, int));
 164
 165 /* in c-convert.c */
 166 extern tree convert                             PARAMS ((tree, tree));
 167
 168 /* in c-decl.c */
 169 extern tree build_enumerator                    PARAMS ((tree, tree));
 170
 171 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P)           \
 172   c_build_qualified_type (TYPE,                                   \
 173                           ((CONST_P) ? TYPE_QUAL_CONST : 0) |     \
 174                           ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
 175 extern int  c_decode_option                     PARAMS ((int, char **));
 176 extern void c_mark_varargs                      PARAMS ((void));
 177 extern void check_for_loop_decls                PARAMS ((void));
 178 extern tree check_identifier                    PARAMS ((tree, tree));
 179 extern void clear_parm_order                    PARAMS ((void));
 180 extern tree combine_parm_decls                  PARAMS ((tree, tree, int));
 181 extern int  complete_array_type                 PARAMS ((tree, tree, int));
 182 extern void declare_parm_level                  PARAMS ((int));
 183 extern tree define_label                        PARAMS ((const char *, int,
 184                                                          tree));
 185 extern void delete_block                        PARAMS ((tree));
 186 extern void finish_decl                         PARAMS ((tree, tree, tree));
 187 extern void finish_decl_top_level               PARAMS ((tree, tree, tree));
 188 extern tree finish_enum                         PARAMS ((tree, tree, tree));
 189 extern void finish_function                     PARAMS ((int));
 190 extern tree finish_struct                       PARAMS ((tree, tree, tree));
 191 extern tree get_parm_info                       PARAMS ((int));
 192 extern tree getdecls                            PARAMS ((void));
 193 extern tree gettags                             PARAMS ((void));
 194 extern int  global_bindings_p                   PARAMS ((void));
 195 extern tree grokfield                           PARAMS ((const char *, int, tree, tree, tree));
 196 extern tree groktypename                        PARAMS ((tree));
 197 extern tree groktypename_in_parm_context        PARAMS ((tree));
 198 extern tree implicitly_declare                  PARAMS ((tree));
 199 extern void implicit_decl_warning               PARAMS ((tree));
 200 extern int  in_parm_level_p                     PARAMS ((void));
 201 extern void init_decl_processing                PARAMS ((void));
 202 extern void insert_block                        PARAMS ((tree));
 203 extern void keep_next_level                     PARAMS ((void));
 204 extern int  kept_level_p                        PARAMS ((void));
 205 extern tree lookup_label                        PARAMS ((tree));
 206 extern tree lookup_name                         PARAMS ((tree));
 207 extern tree lookup_name_current_level           PARAMS ((tree));
 208 extern tree lookup_name_current_level_global    PARAMS ((tree));
 209 extern tree maybe_build_cleanup                 PARAMS ((tree));
 210 extern void parmlist_tags_warning               PARAMS ((void));
 211 extern void pending_xref_error                  PARAMS ((void));
 212 extern void mark_c_function_context             PARAMS ((struct function *));
 213 extern void push_c_function_context             PARAMS ((struct function *));
 214 extern void pop_c_function_context              PARAMS ((struct function *));
 215 extern void pop_label_level                     PARAMS ((void));
 216 extern tree poplevel                            PARAMS ((int, int, int));
 217 extern void print_lang_decl                     PARAMS ((FILE *, tree, int));
 218 extern void print_lang_identifier               PARAMS ((FILE *, tree, int));
 219 extern void print_lang_type                     PARAMS ((FILE *, tree, int));
 220 extern void push_label_level                    PARAMS ((void));
 221 extern void push_parm_decl                      PARAMS ((tree));
 222 extern tree pushdecl                            PARAMS ((tree));
 223 extern tree pushdecl_top_level                  PARAMS ((tree));
 224 extern void pushlevel                           PARAMS ((int));
 225 extern void pushtag                             PARAMS ((tree, tree));
 226 extern void set_block                           PARAMS ((tree));
 227 extern tree shadow_label                        PARAMS ((tree));
 228 extern void shadow_record_fields                PARAMS ((tree));
 229 extern void shadow_tag                          PARAMS ((tree));
 230 extern void shadow_tag_warned                   PARAMS ((tree, int));
 231 extern tree start_enum                          PARAMS ((tree));
 232 extern int  start_function                      PARAMS ((tree, tree, tree,
 233                                                          tree));
 234 extern tree start_decl                          PARAMS ((tree, tree, int,
 235                                                          tree, tree));
 236 extern tree start_struct                        PARAMS ((enum tree_code, tree));
 237 extern void store_parm_decls                    PARAMS ((void));
 238 extern tree xref_tag                            PARAMS ((enum tree_code, tree));
 239 extern tree c_begin_compound_stmt               PARAMS ((void));
 240 extern void c_expand_decl_stmt                  PARAMS ((tree));
 241
 242 /* in c-typeck.c */
 243 extern tree require_complete_type               PARAMS ((tree));
 244 extern void incomplete_type_error               PARAMS ((tree, tree));
 245 extern int comptypes                            PARAMS ((tree, tree));
 246 extern tree c_sizeof                            PARAMS ((tree));
 247 extern tree c_sizeof_nowarn                     PARAMS ((tree));
 248 extern tree c_size_in_bytes                     PARAMS ((tree));
 249 extern tree c_alignof                           PARAMS ((tree));
 250 extern tree c_alignof_expr                      PARAMS ((tree));
 251 extern tree build_component_ref                 PARAMS ((tree, tree));
 252 extern tree build_indirect_ref                  PARAMS ((tree, const char *));
 253 extern tree build_array_ref                     PARAMS ((tree, tree));
 254 extern tree build_external_ref                  PARAMS ((tree, int));
 255 extern tree build_function_call                 PARAMS ((tree, tree));
 256 extern tree parser_build_binary_op              PARAMS ((enum tree_code,
 257                                                          tree, tree));
 258 extern int lvalue_or_else                       PARAMS ((tree, const char *));
 259 extern void readonly_warning                    PARAMS ((tree, const char *));
 260 extern int mark_addressable                     PARAMS ((tree));
 261 extern tree build_conditional_expr              PARAMS ((tree, tree, tree));
 262 extern tree build_compound_expr                 PARAMS ((tree));
 263 extern tree build_c_cast                        PARAMS ((tree, tree));
 264 extern tree build_modify_expr                   PARAMS ((tree, enum tree_code,
 265                                                          tree));
 266 extern void store_init_value                    PARAMS ((tree, tree));
 267 extern void error_init                          PARAMS ((const char *));
 268 extern void pedwarn_init                        PARAMS ((const char *));
 269 extern void start_init                          PARAMS ((tree, tree, int));
 270 extern void finish_init                         PARAMS ((void));
 271 extern void really_start_incremental_init       PARAMS ((tree));
 272 extern void push_init_level                     PARAMS ((int));
 273 extern tree pop_init_level                      PARAMS ((int));
 274 extern void set_init_index                      PARAMS ((tree, tree));
 275 extern void set_init_label                      PARAMS ((tree));
 276 extern void process_init_element                PARAMS ((tree));
 277 extern void pedwarn_c99                         PARAMS ((const char *, ...))
 278                                                         ATTRIBUTE_PRINTF_1;
 279 extern tree c_start_case                        PARAMS ((tree));
 280 extern void c_finish_case                       PARAMS ((void));
 281 extern tree build_asm_stmt                      PARAMS ((tree, tree, tree,
 282                                                          tree, tree));
 283
 284 /* Set to 0 at beginning of a function definition, set to 1 if
 285    a return statement that specifies a return value is seen.  */
 286
 287 extern int current_function_returns_value;
 288
 289 /* Set to 0 at beginning of a function definition, set to 1 if
 290    a return statement with no argument is seen.  */
 291
 292 extern int current_function_returns_null;
 293
 294 /* Nonzero means the expression being parsed will never be evaluated.
 295    This is a count, since unevaluated expressions can nest.  */
 296
 297 extern int skip_evaluation;
 298
 299 /* Nonzero means `$' can be in an identifier.  */
 300
 301 extern int dollars_in_ident;
 302
 303 /* Nonzero means allow type mismatches in conditional expressions;
 304    just make their values `void'.   */
 305
 306 extern int flag_cond_mismatch;
 307
 308 /* Nonzero means don't recognize the keyword `asm'.  */
 309
 310 extern int flag_no_asm;
 311
 312 /* Nonzero means warn about implicit declarations.  */
 313
 314 extern int warn_implicit;
 315
 316 /* Nonzero means warn about sizeof (function) or addition/subtraction
 317    of function pointers.  */
 318
 319 extern int warn_pointer_arith;
 320
 321 /* Nonzero means warn for all old-style non-prototype function decls.  */
 322
 323 extern int warn_strict_prototypes;
 324
 325 /* Nonzero means warn about multiple (redundant) decls for the same single
 326    variable or function.  */
 327
 328 extern int warn_redundant_decls;
 329
 330 /* Nonzero means warn about extern declarations of objects not at
 331    file-scope level and about *all* declarations of functions (whether
 332    extern or static) not at file-scope level.  Note that we exclude
 333    implicit function declarations.  To get warnings about those, use
 334    -Wimplicit.  */
 335
 336 extern int warn_nested_externs;
 337
 338 /* Nonzero means warn about pointer casts that can drop a type qualifier
 339    from the pointer target type.  */
 340
 341 extern int warn_cast_qual;
 342
 343 /* Nonzero means warn when casting a function call to a type that does
 344    not match the return type (e.g. (float)sqrt() or (anything*)malloc()
 345    when there is no previous declaration of sqrt or malloc.  */
 346
 347 extern int warn_bad_function_cast;
 348
 349 /* Warn about traditional constructs whose meanings changed in ANSI C.  */
 350
 351 extern int warn_traditional;
 352
 353 /* Warn about a subscript that has type char.  */
 354
 355 extern int warn_char_subscripts;
 356
 357 /* Warn if main is suspicious. */
 358
 359 extern int warn_main;
 360
 361 /* Nonzero means to allow single precision math even if we're generally
 362    being traditional. */
 363 extern int flag_allow_single_precision;
 364
 365 /* Warn if initializer is not completely bracketed.  */
 366
 367 extern int warn_missing_braces;
 368
 369 /* Warn about comparison of signed and unsigned values.  */
 370
 371 extern int warn_sign_compare;
 372
 373 /* Warn about testing equality of floating point numbers. */
 374
 375 extern int warn_float_equal;
 376
 377 /* Warn about multicharacter constants.  */
 378
 379 extern int warn_multichar;
 380
 381 /* Nonzero means we are reading code that came from a system header file.  */
 382
 383 extern int system_header_p;
 384
 385 /* Warn about implicit declarations.  1 = warning, 2 = error.  */
 386 extern int mesg_implicit_function_declaration;
 387
 388 /* Nonzero enables objc features.  */
 389
 390 #define doing_objc_thang \
 391   (c_language == clk_objective_c)
 392
 393 /* In c-decl.c */
 394 extern void finish_incomplete_decl PARAMS ((tree));
 395
 396 #endif /* not _C_TREE_H */