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 tree maybe_objc_method_name              PARAMS ((tree));
 152 extern int recognize_objc_keyword               PARAMS ((void));
 153 extern tree lookup_objc_ivar                    PARAMS ((tree));
 154 \f
 155 /* in c-parse.in */
 156 extern void c_parse_init                        PARAMS ((void));
 157 extern int yyparse_1                            PARAMS ((void));
 158
 159 /* in c-aux-info.c */
 160 extern void gen_aux_info_record                 PARAMS ((tree, int, int, int));
 161
 162 /* in c-convert.c */
 163 extern tree convert                             PARAMS ((tree, tree));
 164
 165 /* in c-decl.c */
 166 extern tree build_enumerator                    PARAMS ((tree, tree));
 167
 168 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P)           \
 169   c_build_qualified_type (TYPE,                                   \
 170                           ((CONST_P) ? TYPE_QUAL_CONST : 0) |     \
 171                           ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
 172 extern int  c_decode_option                     PARAMS ((int, char **));
 173 extern void c_mark_varargs                      PARAMS ((void));
 174 extern void check_for_loop_decls                PARAMS ((void));
 175 extern tree check_identifier                    PARAMS ((tree, tree));
 176 extern void clear_parm_order                    PARAMS ((void));
 177 extern tree combine_parm_decls                  PARAMS ((tree, tree, int));
 178 extern int  complete_array_type                 PARAMS ((tree, tree, int));
 179 extern void declare_parm_level                  PARAMS ((int));
 180 extern tree define_label                        PARAMS ((const char *, int,
 181                                                          tree));
 182 extern void delete_block                        PARAMS ((tree));
 183 extern void finish_decl                         PARAMS ((tree, tree, tree));
 184 extern void finish_decl_top_level               PARAMS ((tree, tree, tree));
 185 extern tree finish_enum                         PARAMS ((tree, tree, tree));
 186 extern void finish_function                     PARAMS ((int));
 187 extern tree finish_struct                       PARAMS ((tree, tree, tree));
 188 extern tree get_parm_info                       PARAMS ((int));
 189 extern tree getdecls                            PARAMS ((void));
 190 extern tree gettags                             PARAMS ((void));
 191 extern int  global_bindings_p                   PARAMS ((void));
 192 extern tree grokfield                           PARAMS ((const char *, int, tree, tree, tree));
 193 extern tree groktypename                        PARAMS ((tree));
 194 extern tree groktypename_in_parm_context        PARAMS ((tree));
 195 extern tree implicitly_declare                  PARAMS ((tree));
 196 extern void implicit_decl_warning               PARAMS ((tree));
 197 extern int  in_parm_level_p                     PARAMS ((void));
 198 extern void init_decl_processing                PARAMS ((void));
 199 extern void insert_block                        PARAMS ((tree));
 200 extern void keep_next_level                     PARAMS ((void));
 201 extern int  kept_level_p                        PARAMS ((void));
 202 extern tree lookup_label                        PARAMS ((tree));
 203 extern tree lookup_name                         PARAMS ((tree));
 204 extern tree lookup_name_current_level           PARAMS ((tree));
 205 extern tree lookup_name_current_level_global    PARAMS ((tree));
 206 extern tree maybe_build_cleanup                 PARAMS ((tree));
 207 extern void parmlist_tags_warning               PARAMS ((void));
 208 extern void pending_xref_error                  PARAMS ((void));
 209 extern void mark_c_function_context             PARAMS ((struct function *));
 210 extern void push_c_function_context             PARAMS ((struct function *));
 211 extern void pop_c_function_context              PARAMS ((struct function *));
 212 extern void pop_label_level                     PARAMS ((void));
 213 extern tree poplevel                            PARAMS ((int, int, int));
 214 extern void print_lang_decl                     PARAMS ((FILE *, tree, int));
 215 extern void print_lang_identifier               PARAMS ((FILE *, tree, int));
 216 extern void print_lang_type                     PARAMS ((FILE *, tree, int));
 217 extern void push_label_level                    PARAMS ((void));
 218 extern void push_parm_decl                      PARAMS ((tree));
 219 extern tree pushdecl                            PARAMS ((tree));
 220 extern tree pushdecl_top_level                  PARAMS ((tree));
 221 extern void pushlevel                           PARAMS ((int));
 222 extern void pushtag                             PARAMS ((tree, tree));
 223 extern void set_block                           PARAMS ((tree));
 224 extern tree shadow_label                        PARAMS ((tree));
 225 extern void shadow_record_fields                PARAMS ((tree));
 226 extern void shadow_tag                          PARAMS ((tree));
 227 extern void shadow_tag_warned                   PARAMS ((tree, int));
 228 extern tree start_enum                          PARAMS ((tree));
 229 extern int  start_function                      PARAMS ((tree, tree, tree,
 230                                                          tree));
 231 extern tree start_decl                          PARAMS ((tree, tree, int,
 232                                                          tree, tree));
 233 extern tree start_struct                        PARAMS ((enum tree_code, tree));
 234 extern void store_parm_decls                    PARAMS ((void));
 235 extern tree xref_tag                            PARAMS ((enum tree_code, tree));
 236 extern tree c_begin_compound_stmt               PARAMS ((void));
 237 extern void c_expand_decl_stmt                  PARAMS ((tree));
 238
 239 /* in c-typeck.c */
 240 extern tree require_complete_type               PARAMS ((tree));
 241 extern void incomplete_type_error               PARAMS ((tree, tree));
 242 extern int comptypes                            PARAMS ((tree, tree));
 243 extern tree c_sizeof                            PARAMS ((tree));
 244 extern tree c_sizeof_nowarn                     PARAMS ((tree));
 245 extern tree c_size_in_bytes                     PARAMS ((tree));
 246 extern tree c_alignof                           PARAMS ((tree));
 247 extern tree c_alignof_expr                      PARAMS ((tree));
 248 extern tree build_component_ref                 PARAMS ((tree, tree));
 249 extern tree build_indirect_ref                  PARAMS ((tree, const char *));
 250 extern tree build_array_ref                     PARAMS ((tree, tree));
 251 extern tree build_external_ref                  PARAMS ((tree, int));
 252 extern tree build_function_call                 PARAMS ((tree, tree));
 253 extern tree parser_build_binary_op              PARAMS ((enum tree_code,
 254                                                          tree, tree));
 255 extern int lvalue_or_else                       PARAMS ((tree, const char *));
 256 extern void readonly_warning                    PARAMS ((tree, const char *));
 257 extern int mark_addressable                     PARAMS ((tree));
 258 extern tree build_conditional_expr              PARAMS ((tree, tree, tree));
 259 extern tree build_compound_expr                 PARAMS ((tree));
 260 extern tree build_c_cast                        PARAMS ((tree, tree));
 261 extern tree build_modify_expr                   PARAMS ((tree, enum tree_code,
 262                                                          tree));
 263 extern void store_init_value                    PARAMS ((tree, tree));
 264 extern void error_init                          PARAMS ((const char *));
 265 extern void pedwarn_init                        PARAMS ((const char *));
 266 extern void start_init                          PARAMS ((tree, tree, int));
 267 extern void finish_init                         PARAMS ((void));
 268 extern void really_start_incremental_init       PARAMS ((tree));
 269 extern void push_init_level                     PARAMS ((int));
 270 extern tree pop_init_level                      PARAMS ((int));
 271 extern void set_init_index                      PARAMS ((tree, tree));
 272 extern void set_init_label                      PARAMS ((tree));
 273 extern void process_init_element                PARAMS ((tree));
 274 extern void pedwarn_c99                         PARAMS ((const char *, ...))
 275                                                         ATTRIBUTE_PRINTF_1;
 276 extern tree c_start_case                        PARAMS ((tree));
 277 extern void c_finish_case                       PARAMS ((void));
 278
 279 /* Set to 0 at beginning of a function definition, set to 1 if
 280    a return statement that specifies a return value is seen.  */
 281
 282 extern int current_function_returns_value;
 283
 284 /* Set to 0 at beginning of a function definition, set to 1 if
 285    a return statement with no argument is seen.  */
 286
 287 extern int current_function_returns_null;
 288
 289 /* Nonzero means the expression being parsed will never be evaluated.
 290    This is a count, since unevaluated expressions can nest.  */
 291
 292 extern int skip_evaluation;
 293
 294 /* Nonzero means `$' can be in an identifier.  */
 295
 296 extern int dollars_in_ident;
 297
 298 /* Nonzero means allow type mismatches in conditional expressions;
 299    just make their values `void'.   */
 300
 301 extern int flag_cond_mismatch;
 302
 303 /* Nonzero means don't recognize the keyword `asm'.  */
 304
 305 extern int flag_no_asm;
 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 traditional constructs whose meanings changed in ANSI C.  */
 345
 346 extern int warn_traditional;
 347
 348 /* Warn about a subscript that has type char.  */
 349
 350 extern int warn_char_subscripts;
 351
 352 /* Warn if main is suspicious. */
 353
 354 extern int warn_main;
 355
 356 /* Nonzero means to allow single precision math even if we're generally
 357    being traditional. */
 358 extern int flag_allow_single_precision;
 359
 360 /* Warn if initializer is not completely bracketed.  */
 361
 362 extern int warn_missing_braces;
 363
 364 /* Warn about comparison of signed and unsigned values.  */
 365
 366 extern int warn_sign_compare;
 367
 368 /* Warn about testing equality of floating point numbers. */
 369
 370 extern int warn_float_equal;
 371
 372 /* Warn about multicharacter constants.  */
 373
 374 extern int warn_multichar;
 375
 376 /* Warn about long long.  */
 377
 378 extern int warn_long_long;
 379
 380 /* Nonzero means we are reading code that came from a system header file.  */
 381
 382 extern int system_header_p;
 383
 384 /* Warn about implicit declarations.  1 = warning, 2 = error.  */
 385 extern int mesg_implicit_function_declaration;
 386
 387 /* Nonzero enables objc features.  */
 388
 389 #define doing_objc_thang \
 390   (c_language == clk_objective_c)
 391
 392 /* In c-decl.c */
 393 extern void finish_incomplete_decl PARAMS ((tree));
 394
 395 #endif /* not _C_TREE_H */