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 /* Wrapping c_lang_decl in another struct is an unfortunate
  46    necessity.  */
  47
  48 struct lang_decl
  49 {
  50   struct c_lang_decl base;
  51 };
  52
  53 /* Macros for access to language-specific slots in an identifier.  */
  54 /* Each of these slots contains a DECL node or null.  */
  55
  56 /* This represents the value which the identifier has in the
  57    file-scope namespace.  */
  58 #define IDENTIFIER_GLOBAL_VALUE(NODE)   \
  59   (((struct lang_identifier *) (NODE))->global_value)
  60 /* This represents the value which the identifier has in the current
  61    scope.  */
  62 #define IDENTIFIER_LOCAL_VALUE(NODE)    \
  63   (((struct lang_identifier *) (NODE))->local_value)
  64 /* This represents the value which the identifier has as a label in
  65    the current label scope.  */
  66 #define IDENTIFIER_LABEL_VALUE(NODE)    \
  67   (((struct lang_identifier *) (NODE))->label_value)
  68 /* This records the extern decl of this identifier, if it has had one
  69    at any point in this compilation.  */
  70 #define IDENTIFIER_LIMBO_VALUE(NODE)    \
  71   (((struct lang_identifier *) (NODE))->limbo_value)
  72 /* This records the implicit function decl of this identifier, if it
  73    has had one at any point in this compilation.  */
  74 #define IDENTIFIER_IMPLICIT_DECL(NODE)  \
  75   (((struct lang_identifier *) (NODE))->implicit_decl)
  76 /* This is the last function in which we printed an "undefined variable"
  77    message for this identifier.  Value is a FUNCTION_DECL or null.  */
  78 #define IDENTIFIER_ERROR_LOCUS(NODE)    \
  79   (((struct lang_identifier *) (NODE))->error_locus)
  80
  81 /* In identifiers, C uses the following fields in a special way:
  82    TREE_PUBLIC        to record that there was a previous local extern decl.
  83    TREE_USED          to record that such a decl was used.
  84    TREE_ADDRESSABLE   to record that the address of such a decl was used.  */
  85
  86 /* Nonzero means reject anything that ANSI standard C forbids.  */
  87 extern int pedantic;
  88
  89 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only.  */
  90 #define C_TYPE_FIELDS_READONLY(type) TREE_LANG_FLAG_1 (type)
  91
  92 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile.  */
  93 #define C_TYPE_FIELDS_VOLATILE(type) TREE_LANG_FLAG_2 (type)
  94
  95 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
  96    nonzero if the definition of the type has already started.  */
  97 #define C_TYPE_BEING_DEFINED(type) TYPE_LANG_FLAG_0 (type)
  98
  99 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
 100    keyword.  C_RID_CODE (node) is then the RID_* value of the keyword,
 101    and C_RID_YYCODE is the token number wanted by Yacc.  */
 102
 103 #define C_IS_RESERVED_WORD(id) TREE_LANG_FLAG_0 (id)
 104 #define C_RID_CODE(id) \
 105   (((struct lang_identifier *) (id))->rid_code)
 106
 107 /* In a RECORD_TYPE, a sorted array of the fields of the type.  */
 108 struct lang_type
 109 {
 110   int len;
 111   tree elts[1];
 112 };
 113
 114 /* Record whether a type or decl was written with nonconstant size.
 115    Note that TYPE_SIZE may have simplified to a constant.  */
 116 #define C_TYPE_VARIABLE_SIZE(type) TYPE_LANG_FLAG_1 (type)
 117 #define C_DECL_VARIABLE_SIZE(type) DECL_LANG_FLAG_0 (type)
 118
 119 #if 0 /* Not used.  */
 120 /* Record whether a decl for a function or function pointer has
 121    already been mentioned (in a warning) because it was called
 122    but didn't have a prototype.  */
 123 #define C_MISSING_PROTOTYPE_WARNED(decl) DECL_LANG_FLAG_2(decl)
 124 #endif
 125
 126 /* Store a value in that field.  */
 127 #define C_SET_EXP_ORIGINAL_CODE(exp, code) \
 128   (TREE_COMPLEXITY (exp) = (int) (code))
 129
 130 /* Record whether a typedef for type `int' was actually `signed int'.  */
 131 #define C_TYPEDEF_EXPLICITLY_SIGNED(exp) DECL_LANG_FLAG_1 ((exp))
 132
 133 /* Nonzero for a declaration of a built in function if there has been no
 134    occasion that would declare the function in ordinary C.
 135    Using the function draws a pedantic warning in this case.  */
 136 #define C_DECL_ANTICIPATED(exp) DECL_LANG_FLAG_3 ((exp))
 137
 138 /* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
 139    TYPE_ARG_TYPES for functions with prototypes, but created for functions
 140    without prototypes.  */
 141 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_NONCOPIED_PARTS (NODE)
 142
 143 \f
 144 /* in c-lang.c and objc-act.c */
 145 extern tree lookup_interface                    PARAMS ((tree));
 146 extern tree is_class_name                       PARAMS ((tree));
 147 extern void maybe_objc_check_decl               PARAMS ((tree));
 148 extern void finish_file                         PARAMS ((void));
 149 extern int maybe_objc_comptypes                 PARAMS ((tree, tree, int));
 150 extern tree maybe_building_objc_message_expr    PARAMS ((void));
 151 extern int recognize_objc_keyword               PARAMS ((void));
 152 extern tree lookup_objc_ivar                    PARAMS ((tree));
 153 \f
 154 /* in c-parse.in */
 155 extern void c_parse_init                        PARAMS ((void));
 156 extern int yyparse_1                            PARAMS ((void));
 157
 158 /* in c-aux-info.c */
 159 extern void gen_aux_info_record                 PARAMS ((tree, int, int, int));
 160
 161 /* in c-convert.c */
 162 extern tree convert                             PARAMS ((tree, tree));
 163
 164 /* in c-decl.c */
 165 extern tree build_enumerator                    PARAMS ((tree, tree));
 166
 167 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P)           \
 168   c_build_qualified_type (TYPE,                                   \
 169                           ((CONST_P) ? TYPE_QUAL_CONST : 0) |     \
 170                           ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
 171 extern int  c_decode_option                     PARAMS ((int, char **));
 172 extern void c_mark_varargs                      PARAMS ((void));
 173 extern void check_for_loop_decls                PARAMS ((void));
 174 extern tree check_identifier                    PARAMS ((tree, tree));
 175 extern void clear_parm_order                    PARAMS ((void));
 176 extern tree combine_parm_decls                  PARAMS ((tree, tree, int));
 177 extern int  complete_array_type                 PARAMS ((tree, tree, int));
 178 extern void declare_parm_level                  PARAMS ((int));
 179 extern tree define_label                        PARAMS ((const char *, int,
 180                                                          tree));
 181 extern void delete_block                        PARAMS ((tree));
 182 extern void finish_decl                         PARAMS ((tree, tree, tree));
 183 extern void finish_decl_top_level               PARAMS ((tree, tree, tree));
 184 extern tree finish_enum                         PARAMS ((tree, tree, tree));
 185 extern void finish_function                     PARAMS ((int));
 186 extern tree finish_struct                       PARAMS ((tree, tree, tree));
 187 extern tree get_parm_info                       PARAMS ((int));
 188 extern tree getdecls                            PARAMS ((void));
 189 extern tree gettags                             PARAMS ((void));
 190 extern int  global_bindings_p                   PARAMS ((void));
 191 extern tree grokfield                           PARAMS ((const char *, int, tree, tree, tree));
 192 extern tree groktypename                        PARAMS ((tree));
 193 extern tree groktypename_in_parm_context        PARAMS ((tree));
 194 extern tree implicitly_declare                  PARAMS ((tree));
 195 extern void implicit_decl_warning               PARAMS ((tree));
 196 extern int  in_parm_level_p                     PARAMS ((void));
 197 extern void init_decl_processing                PARAMS ((void));
 198 extern void insert_block                        PARAMS ((tree));
 199 extern void keep_next_level                     PARAMS ((void));
 200 extern int  kept_level_p                        PARAMS ((void));
 201 extern tree lookup_label                        PARAMS ((tree));
 202 extern tree lookup_name                         PARAMS ((tree));
 203 extern tree lookup_name_current_level           PARAMS ((tree));
 204 extern tree lookup_name_current_level_global    PARAMS ((tree));
 205 extern tree maybe_build_cleanup                 PARAMS ((tree));
 206 extern void parmlist_tags_warning               PARAMS ((void));
 207 extern void pending_xref_error                  PARAMS ((void));
 208 extern void mark_c_function_context             PARAMS ((struct function *));
 209 extern void push_c_function_context             PARAMS ((struct function *));
 210 extern void pop_c_function_context              PARAMS ((struct function *));
 211 extern void pop_label_level                     PARAMS ((void));
 212 extern tree poplevel                            PARAMS ((int, int, int));
 213 extern void print_lang_decl                     PARAMS ((FILE *, tree, int));
 214 extern void print_lang_identifier               PARAMS ((FILE *, tree, int));
 215 extern void print_lang_type                     PARAMS ((FILE *, tree, int));
 216 extern void push_label_level                    PARAMS ((void));
 217 extern void push_parm_decl                      PARAMS ((tree));
 218 extern tree pushdecl                            PARAMS ((tree));
 219 extern tree pushdecl_top_level                  PARAMS ((tree));
 220 extern void pushlevel                           PARAMS ((int));
 221 extern void pushtag                             PARAMS ((tree, tree));
 222 extern void set_block                           PARAMS ((tree));
 223 extern tree shadow_label                        PARAMS ((tree));
 224 extern void shadow_record_fields                PARAMS ((tree));
 225 extern void shadow_tag                          PARAMS ((tree));
 226 extern void shadow_tag_warned                   PARAMS ((tree, int));
 227 extern tree start_enum                          PARAMS ((tree));
 228 extern int  start_function                      PARAMS ((tree, tree, tree,
 229                                                          tree));
 230 extern tree start_decl                          PARAMS ((tree, tree, int,
 231                                                          tree, tree));
 232 extern tree start_struct                        PARAMS ((enum tree_code, tree));
 233 extern void store_parm_decls                    PARAMS ((void));
 234 extern tree xref_tag                            PARAMS ((enum tree_code, tree));
 235 extern tree c_begin_compound_stmt               PARAMS ((void));
 236 extern void c_expand_decl_stmt                  PARAMS ((tree));
 237
 238 /* in c-typeck.c */
 239 extern tree require_complete_type               PARAMS ((tree));
 240 extern void incomplete_type_error               PARAMS ((tree, tree));
 241 extern int comptypes                            PARAMS ((tree, tree));
 242 extern tree c_sizeof                            PARAMS ((tree));
 243 extern tree c_sizeof_nowarn                     PARAMS ((tree));
 244 extern tree c_size_in_bytes                     PARAMS ((tree));
 245 extern tree c_alignof                           PARAMS ((tree));
 246 extern tree c_alignof_expr                      PARAMS ((tree));
 247 extern tree build_component_ref                 PARAMS ((tree, tree));
 248 extern tree build_indirect_ref                  PARAMS ((tree, const char *));
 249 extern tree build_array_ref                     PARAMS ((tree, tree));
 250 extern tree build_external_ref                  PARAMS ((tree, int));
 251 extern tree build_function_call                 PARAMS ((tree, tree));
 252 extern tree parser_build_binary_op              PARAMS ((enum tree_code,
 253                                                          tree, tree));
 254 extern int lvalue_or_else                       PARAMS ((tree, const char *));
 255 extern void readonly_warning                    PARAMS ((tree, const char *));
 256 extern int mark_addressable                     PARAMS ((tree));
 257 extern tree build_conditional_expr              PARAMS ((tree, tree, tree));
 258 extern tree build_compound_expr                 PARAMS ((tree));
 259 extern tree build_c_cast                        PARAMS ((tree, tree));
 260 extern tree build_modify_expr                   PARAMS ((tree, enum tree_code,
 261                                                          tree));
 262 extern void store_init_value                    PARAMS ((tree, tree));
 263 extern void error_init                          PARAMS ((const char *));
 264 extern void pedwarn_init                        PARAMS ((const char *));
 265 extern void start_init                          PARAMS ((tree, tree, int));
 266 extern void finish_init                         PARAMS ((void));
 267 extern void really_start_incremental_init       PARAMS ((tree));
 268 extern void push_init_level                     PARAMS ((int));
 269 extern tree pop_init_level                      PARAMS ((int));
 270 extern void set_init_index                      PARAMS ((tree, tree));
 271 extern void set_init_label                      PARAMS ((tree));
 272 extern void process_init_element                PARAMS ((tree));
 273 extern void pedwarn_c99                         PARAMS ((const char *, ...))
 274                                                         ATTRIBUTE_PRINTF_1;
 275 extern tree c_start_case                        PARAMS ((tree));
 276 extern void c_finish_case                       PARAMS ((void));
 277 extern tree build_asm_stmt                      PARAMS ((tree, tree, tree,
 278                                                          tree, tree));
 279
 280 /* Set to 0 at beginning of a function definition, set to 1 if
 281    a return statement that specifies a return value is seen.  */
 282
 283 extern int current_function_returns_value;
 284
 285 /* Set to 0 at beginning of a function definition, set to 1 if
 286    a return statement with no argument is seen.  */
 287
 288 extern int current_function_returns_null;
 289
 290 /* Nonzero means the expression being parsed will never be evaluated.
 291    This is a count, since unevaluated expressions can nest.  */
 292
 293 extern int skip_evaluation;
 294
 295 /* Nonzero means `$' can be in an identifier.  */
 296
 297 extern int dollars_in_ident;
 298
 299 /* Nonzero means allow type mismatches in conditional expressions;
 300    just make their values `void'.   */
 301
 302 extern int flag_cond_mismatch;
 303
 304 /* Nonzero means don't recognize the keyword `asm'.  */
 305
 306 extern int flag_no_asm;
 307
 308 /* Nonzero means warn about implicit declarations.  */
 309
 310 extern int warn_implicit;
 311
 312 /* Nonzero means warn about sizeof (function) or addition/subtraction
 313    of function pointers.  */
 314
 315 extern int warn_pointer_arith;
 316
 317 /* Nonzero means warn for all old-style non-prototype function decls.  */
 318
 319 extern int warn_strict_prototypes;
 320
 321 /* Nonzero means warn about multiple (redundant) decls for the same single
 322    variable or function.  */
 323
 324 extern int warn_redundant_decls;
 325
 326 /* Nonzero means warn about extern declarations of objects not at
 327    file-scope level and about *all* declarations of functions (whether
 328    extern or static) not at file-scope level.  Note that we exclude
 329    implicit function declarations.  To get warnings about those, use
 330    -Wimplicit.  */
 331
 332 extern int warn_nested_externs;
 333
 334 /* Nonzero means warn about pointer casts that can drop a type qualifier
 335    from the pointer target type.  */
 336
 337 extern int warn_cast_qual;
 338
 339 /* Nonzero means warn when casting a function call to a type that does
 340    not match the return type (e.g. (float)sqrt() or (anything*)malloc()
 341    when there is no previous declaration of sqrt or malloc.  */
 342
 343 extern int warn_bad_function_cast;
 344
 345 /* Warn about traditional constructs whose meanings changed in ANSI C.  */
 346
 347 extern int warn_traditional;
 348
 349 /* Warn about a subscript that has type char.  */
 350
 351 extern int warn_char_subscripts;
 352
 353 /* Warn if main is suspicious. */
 354
 355 extern int warn_main;
 356
 357 /* Nonzero means to allow single precision math even if we're generally
 358    being traditional. */
 359 extern int flag_allow_single_precision;
 360
 361 /* Warn if initializer is not completely bracketed.  */
 362
 363 extern int warn_missing_braces;
 364
 365 /* Warn about comparison of signed and unsigned values.  */
 366
 367 extern int warn_sign_compare;
 368
 369 /* Warn about testing equality of floating point numbers. */
 370
 371 extern int warn_float_equal;
 372
 373 /* Warn about multicharacter constants.  */
 374
 375 extern int warn_multichar;
 376
 377 /* Nonzero means we are reading code that came from a system header file.  */
 378
 379 extern int system_header_p;
 380
 381 /* Warn about implicit declarations.  1 = warning, 2 = error.  */
 382 extern int mesg_implicit_function_declaration;
 383
 384 /* Nonzero enables objc features.  */
 385
 386 #define doing_objc_thang \
 387   (c_language == clk_objective_c)
 388
 389 /* In c-decl.c */
 390 extern void finish_incomplete_decl PARAMS ((tree));
 391
 392 #endif /* not _C_TREE_H */