gcc/c-tree.h

   1 /* Definitions for C parsing and type checking.
   2    Copyright (C) 1987, 1993, 1994 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, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 #ifndef _C_TREE_H
  21 #define _C_TREE_H
  22
  23 /* Language-dependent contents of an identifier.  */
  24
  25 /* The limbo_value is used for block level extern declarations, which need
  26    to be type checked against subsequent extern declarations.  They can't
  27    be referenced after they fall out of scope, so they can't be global.  */
  28
  29 struct lang_identifier
  30 {
  31   struct tree_identifier ignore;
  32   tree global_value, local_value, label_value, implicit_decl;
  33   tree error_locus, limbo_value;
  34 };
  35
  36 /* Macros for access to language-specific slots in an identifier.  */
  37 /* Each of these slots contains a DECL node or null.  */
  38
  39 /* This represents the value which the identifier has in the
  40    file-scope namespace.  */
  41 #define IDENTIFIER_GLOBAL_VALUE(NODE)   \
  42   (((struct lang_identifier *)(NODE))->global_value)
  43 /* This represents the value which the identifier has in the current
  44    scope.  */
  45 #define IDENTIFIER_LOCAL_VALUE(NODE)    \
  46   (((struct lang_identifier *)(NODE))->local_value)
  47 /* This represents the value which the identifier has as a label in
  48    the current label scope.  */
  49 #define IDENTIFIER_LABEL_VALUE(NODE)    \
  50   (((struct lang_identifier *)(NODE))->label_value)
  51 /* This records the extern decl of this identifier, if it has had one
  52    at any point in this compilation.  */
  53 #define IDENTIFIER_LIMBO_VALUE(NODE)    \
  54   (((struct lang_identifier *)(NODE))->limbo_value)
  55 /* This records the implicit function decl of this identifier, if it
  56    has had one at any point in this compilation.  */
  57 #define IDENTIFIER_IMPLICIT_DECL(NODE)  \
  58   (((struct lang_identifier *)(NODE))->implicit_decl)
  59 /* This is the last function in which we printed an "undefined variable"
  60    message for this identifier.  Value is a FUNCTION_DECL or null.  */
  61 #define IDENTIFIER_ERROR_LOCUS(NODE)    \
  62   (((struct lang_identifier *)(NODE))->error_locus)
  63
  64 /* In identifiers, C uses the following fields in a special way:
  65    TREE_PUBLIC        to record that there was a previous local extern decl.
  66    TREE_USED          to record that such a decl was used.
  67    TREE_ADDRESSABLE   to record that the address of such a decl was used.  */
  68
  69 /* Nonzero means reject anything that ANSI standard C forbids.  */
  70 extern int pedantic;
  71
  72 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only.  */
  73 #define C_TYPE_FIELDS_READONLY(type) TREE_LANG_FLAG_1 (type)
  74
  75 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile.  */
  76 #define C_TYPE_FIELDS_VOLATILE(type) TREE_LANG_FLAG_2 (type)
  77
  78 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
  79    nonzero if the definition of the type has already started.  */
  80 #define C_TYPE_BEING_DEFINED(type) TYPE_LANG_FLAG_0 (type)
  81
  82 /* In a RECORD_TYPE, a sorted array of the fields of the type.  */
  83 struct lang_type
  84 {
  85   int len;
  86   tree elts[1];
  87 };
  88
  89 /* Mark which labels are explicitly declared.
  90    These may be shadowed, and may be referenced from nested functions.  */
  91 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
  92
  93 /* Record whether a type or decl was written with nonconstant size.
  94    Note that TYPE_SIZE may have simplified to a constant.  */
  95 #define C_TYPE_VARIABLE_SIZE(type) TYPE_LANG_FLAG_1 (type)
  96 #define C_DECL_VARIABLE_SIZE(type) DECL_LANG_FLAG_0 (type)
  97
  98 /* Record in each node resulting from a binary operator
  99    what operator was specified for it.  */
 100 #define C_EXP_ORIGINAL_CODE(exp) ((enum tree_code) TREE_COMPLEXITY (exp))
 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 /* Nonzero if the type T promotes to itself.
 127    ANSI C states explicitly the list of types that promote;
 128    in particular, short promotes to int even if they have the same width.  */
 129 #define C_PROMOTING_INTEGER_TYPE_P(t)                           \
 130   (TREE_CODE ((t)) == INTEGER_TYPE                              \
 131    && (TYPE_MAIN_VARIANT (t) == char_type_node                  \
 132        || TYPE_MAIN_VARIANT (t) == signed_char_type_node        \
 133        || TYPE_MAIN_VARIANT (t) == unsigned_char_type_node      \
 134        || TYPE_MAIN_VARIANT (t) == short_integer_type_node      \
 135        || TYPE_MAIN_VARIANT (t) == short_unsigned_type_node))
 136
 137 /* In a VAR_DECL, means the variable is really an iterator.  */
 138 #define ITERATOR_P(D) (DECL_LANG_FLAG_4(D))
 139
 140 /* In a VAR_DECL for an iterator, means we are within
 141    an explicit loop over that iterator.  */
 142 #define ITERATOR_BOUND_P(NODE) ((NODE)->common.readonly_flag)
 143 \f
 144 /* in c-lang.c and objc-act.c */
 145 extern tree lookup_interface                    PROTO((tree));
 146 extern tree is_class_name                       PROTO((tree));
 147 extern void maybe_objc_check_decl               PROTO((tree));
 148 extern int maybe_objc_comptypes                 PROTO((tree, tree, int));
 149 extern tree maybe_building_objc_message_expr    PROTO((void));
 150 extern tree maybe_objc_method_name              PROTO((tree));
 151 extern int recognize_objc_keyword               PROTO((void));
 152 extern tree build_objc_string                   PROTO((int, char *));
 153 \f
 154 /* in c-aux-info.c */
 155 extern void gen_aux_info_record                 PROTO((tree, int, int, int));
 156
 157 /* in c-common.c */
 158 extern void declare_function_name               PROTO((void));
 159 extern void decl_attributes                     PROTO((tree, tree));
 160 extern void init_function_format_info           PROTO((void));
 161 extern void record_function_format              PROTO((tree, tree, int, int, int));
 162 extern void check_function_format               PROTO((tree, tree, tree));
 163 /* Print an error message for invalid operands to arith operation CODE.
 164    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 165 extern void binary_op_error                     PROTO((enum tree_code));
 166 extern void c_expand_expr_stmt                  PROTO((tree));
 167 /* Validate the expression after `case' and apply default promotions.  */
 168 extern tree check_case_value                    PROTO((tree));
 169 /* Concatenate a list of STRING_CST nodes into one STRING_CST.  */
 170 extern tree combine_strings                     PROTO((tree));
 171 extern void constant_expression_warning         PROTO((tree));
 172 extern tree convert_and_check                   PROTO((tree, tree));
 173 extern void overflow_warning                    PROTO((tree));
 174 extern void unsigned_conversion_warning         PROTO((tree, tree));
 175 /* Read the rest of the current #-directive line.  */
 176 extern char *get_directive_line                 STDIO_PROTO((FILE *));
 177 /* Subroutine of build_binary_op, used for comparison operations.
 178    See if the operands have both been converted from subword integer types
 179    and, if so, perhaps change them both back to their original type.  */
 180 extern tree shorten_compare                     PROTO((tree *, tree *, tree *, enum tree_code *));
 181 /* Prepare expr to be an argument of a TRUTH_NOT_EXPR,
 182    or validate its data type for an `if' or `while' statement or ?..: exp. */
 183 extern tree truthvalue_conversion               PROTO((tree));
 184 extern tree type_for_mode                       PROTO((enum machine_mode, int));
 185 extern tree type_for_size                       PROTO((unsigned, int));
 186
 187 /* in c-convert.c */
 188 extern tree convert                             PROTO((tree, tree));
 189
 190 /* in c-decl.c */
 191 /* Standard named or nameless data types of the C compiler.  */
 192 extern tree char_array_type_node;
 193 extern tree char_type_node;
 194 extern tree const_ptr_type_node;
 195 extern tree const_string_type_node;
 196 extern tree default_function_type;
 197 extern tree double_ftype_double;
 198 extern tree double_ftype_double_double;
 199 extern tree double_type_node;
 200 extern tree float_type_node;
 201 extern tree intDI_type_node;
 202 extern tree intHI_type_node;
 203 extern tree intQI_type_node;
 204 extern tree intSI_type_node;
 205 extern tree int_array_type_node;
 206 extern tree int_ftype_cptr_cptr_sizet;
 207 extern tree int_ftype_int;
 208 extern tree int_ftype_ptr_ptr_int;
 209 extern tree int_ftype_string_string;
 210 extern tree integer_type_node;
 211 extern tree long_double_type_node;
 212 extern tree long_ftype_long;
 213 extern tree long_integer_type_node;
 214 extern tree long_long_integer_type_node;
 215 extern tree long_long_unsigned_type_node;
 216 extern tree long_unsigned_type_node;
 217 extern tree complex_integer_type_node;
 218 extern tree complex_float_type_node;
 219 extern tree complex_double_type_node;
 220 extern tree complex_long_double_type_node;
 221 extern tree ptr_type_node;
 222 extern tree ptrdiff_type_node;
 223 extern tree short_integer_type_node;
 224 extern tree short_unsigned_type_node;
 225 extern tree signed_char_type_node;
 226 extern tree signed_wchar_type_node;
 227 extern tree string_ftype_ptr_ptr;
 228 extern tree string_type_node;
 229 extern tree unsigned_char_type_node;
 230 extern tree unsigned_intDI_type_node;
 231 extern tree unsigned_intHI_type_node;
 232 extern tree unsigned_intQI_type_node;
 233 extern tree unsigned_intSI_type_node;
 234 extern tree unsigned_type_node;
 235 extern tree unsigned_wchar_type_node;
 236 extern tree void_ftype_ptr_int_int;
 237 extern tree void_ftype_ptr_ptr_int;
 238 extern tree void_type_node;
 239 extern tree wchar_array_type_node;
 240 extern tree wchar_type_node;
 241
 242 extern tree build_enumerator                    PROTO((tree, tree));
 243 /* Declare a predefined function.  Return the declaration.  */
 244 extern tree builtin_function                    PROTO((char *, tree, enum built_in_function function_, char *));
 245 /* Add qualifiers to a type, in the fashion for C.  */
 246 extern tree c_build_type_variant                PROTO((tree, int, int));
 247 extern int  c_decode_option                     PROTO((char *));
 248 extern void c_mark_varargs                      PROTO((void));
 249 extern tree check_identifier                    PROTO((tree, tree));
 250 extern void clear_parm_order                    PROTO((void));
 251 extern tree combine_parm_decls                  PROTO((tree, tree, int));
 252 extern int  complete_array_type                 PROTO((tree, tree, int));
 253 extern void declare_parm_level                  PROTO((int));
 254 extern tree define_label                        PROTO((char *, int, tree));
 255 extern void delete_block                        PROTO((tree));
 256 extern void finish_decl                         PROTO((tree, tree, tree));
 257 extern tree finish_enum                         PROTO((tree, tree));
 258 extern void finish_function                     PROTO((int));
 259 extern tree finish_struct                       PROTO((tree, tree));
 260 extern tree get_parm_info                       PROTO((int));
 261 extern tree getdecls                            PROTO((void));
 262 extern tree gettags                             PROTO((void));
 263 extern int  global_bindings_p                   PROTO((void));
 264 extern tree grokfield                           PROTO((char *, int, tree, tree, tree));
 265 extern tree groktypename                        PROTO((tree));
 266 extern tree groktypename_in_parm_context        PROTO((tree));
 267 extern tree implicitly_declare                  PROTO((tree));
 268 extern int  in_parm_level_p                     PROTO((void));
 269 extern void init_decl_processing                PROTO((void));
 270 extern void insert_block                        PROTO((tree));
 271 extern void keep_next_level                     PROTO((void));
 272 extern int  kept_level_p                        PROTO((void));
 273 extern tree lookup_label                        PROTO((tree));
 274 extern tree lookup_name                         PROTO((tree));
 275 extern tree lookup_name_current_level           PROTO((tree));
 276 extern tree lookup_name_current_level_global    PROTO((tree));
 277 extern tree maybe_build_cleanup                 PROTO((tree));
 278 extern void parmlist_tags_warning               PROTO((void));
 279 extern void pending_xref_error                  PROTO((void));
 280 extern void pop_c_function_context              PROTO((void));
 281 extern void pop_label_level                     PROTO((void));
 282 extern tree poplevel                            PROTO((int, int, int));
 283 extern void print_lang_decl                     STDIO_PROTO((FILE *, tree,
 284                                                              int));
 285 extern void print_lang_identifier               STDIO_PROTO((FILE *, tree,
 286                                                              int));
 287 extern void print_lang_type                     STDIO_PROTO((FILE *, tree,
 288                                                              int));
 289 extern void push_c_function_context             PROTO((void));
 290 extern void push_label_level                    PROTO((void));
 291 extern void push_parm_decl                      PROTO((tree));
 292 extern tree pushdecl                            PROTO((tree));
 293 extern tree pushdecl_top_level                  PROTO((tree));
 294 extern void pushlevel                           PROTO((int));
 295 extern void pushtag                             PROTO((tree, tree));
 296 extern void set_block                           PROTO((tree));
 297 extern tree shadow_label                        PROTO((tree));
 298 extern void shadow_record_fields                PROTO((tree));
 299 extern void shadow_tag                          PROTO((tree));
 300 extern void shadow_tag_warned                   PROTO((tree, int));
 301 extern tree start_enum                          PROTO((tree));
 302 extern int  start_function                      PROTO((tree, tree, int));
 303 extern tree start_decl                          PROTO((tree, tree, int));
 304 extern tree start_struct                        PROTO((enum tree_code, tree));
 305 extern void store_parm_decls                    PROTO((void));
 306 extern tree xref_tag                            PROTO((enum tree_code, tree));
 307
 308 /* in c-typeck.c */
 309 extern tree require_complete_type               PROTO((tree));
 310 extern void incomplete_type_error               PROTO((tree, tree));
 311 /* Given two integer or real types, return the type for their sum.
 312    Given two compatible ANSI C types, returns the merged type.  */
 313 extern tree common_type                         PROTO((tree, tree));
 314 extern int comptypes                            PROTO((tree, tree));
 315 extern int self_promoting_args_p                PROTO((tree));
 316 extern tree c_sizeof                            PROTO((tree));
 317 extern tree c_sizeof_nowarn                     PROTO((tree));
 318 extern tree c_size_in_bytes                     PROTO((tree));
 319 extern tree c_alignof                           PROTO((tree));
 320 extern tree c_alignof_expr                      PROTO((tree));
 321 extern tree default_conversion                  PROTO((tree));
 322 extern tree build_component_ref                 PROTO((tree, tree));
 323 extern tree build_indirect_ref                  PROTO((tree, char *));
 324 extern tree build_array_ref                     PROTO((tree, tree));
 325 extern tree build_function_call                 PROTO((tree, tree));
 326 extern tree parser_build_binary_op              PROTO((enum tree_code,
 327                                                        tree, tree));
 328 extern tree build_binary_op                     PROTO((enum tree_code,
 329                                                        tree, tree, int));
 330 extern tree build_unary_op                      PROTO((enum tree_code,
 331                                                        tree, int));
 332 extern int lvalue_p                             PROTO((tree));
 333 extern int lvalue_or_else                       PROTO((tree, char *));
 334 extern void readonly_warning                    PROTO((tree, char *));
 335 extern int mark_addressable                     PROTO((tree));
 336 extern tree build_conditional_expr              PROTO((tree, tree, tree));
 337 extern tree build_compound_expr                 PROTO((tree));
 338 extern tree build_c_cast                        PROTO((tree, tree));
 339 extern tree build_modify_expr                   PROTO((tree, enum tree_code,
 340                                                        tree));
 341 extern tree initializer_constant_valid_p        PROTO((tree, tree));
 342 extern void store_init_value                    PROTO((tree, tree));
 343 extern void error_init                          PROTO((char *, char *,
 344                                                        char *));
 345 extern void pedwarn_init                        PROTO((char *, char *,
 346                                                        char *));
 347 extern void start_init                          PROTO((tree, tree, int));
 348 extern void finish_init                         PROTO((void));
 349 extern void really_start_incremental_init       PROTO((tree));
 350 extern void push_init_level                     PROTO((int));
 351 extern tree pop_init_level                      PROTO((int));
 352 extern void set_init_index                      PROTO((tree, tree));
 353 extern void set_init_label                      PROTO((tree));
 354 extern void process_init_element                PROTO((tree));
 355 extern void c_expand_asm_operands               PROTO((tree, tree, tree, tree,
 356                                                        int, char *, int));
 357 extern void c_expand_return                     PROTO((tree));
 358 extern tree c_expand_start_case                 PROTO((tree));
 359
 360 /* in c-iterate.c */
 361 extern void iterator_expand                     PROTO((tree));
 362 extern void iterator_for_loop_start             PROTO((tree));
 363 extern void iterator_for_loop_end               PROTO((tree));
 364 extern void iterator_for_loop_record            PROTO((tree));
 365 extern void push_iterator_stack                 PROTO((void));
 366 extern void pop_iterator_stack                  PROTO((void));
 367
 368 /* Set to 0 at beginning of a function definition, set to 1 if
 369    a return statement that specifies a return value is seen.  */
 370
 371 extern int current_function_returns_value;
 372
 373 /* Set to 0 at beginning of a function definition, set to 1 if
 374    a return statement with no argument is seen.  */
 375
 376 extern int current_function_returns_null;
 377
 378 /* Nonzero means `$' can be in an identifier.  */
 379
 380 extern int dollars_in_ident;
 381
 382 /* Nonzero means allow type mismatches in conditional expressions;
 383    just make their values `void'.   */
 384
 385 extern int flag_cond_mismatch;
 386
 387 /* Nonzero means don't recognize the keyword `asm'.  */
 388
 389 extern int flag_no_asm;
 390
 391 /* Nonzero means ignore `#ident' directives.  */
 392
 393 extern int flag_no_ident;
 394
 395 /* Nonzero means warn about implicit declarations.  */
 396
 397 extern int warn_implicit;
 398
 399 /* Nonzero means give string constants the type `const char *'
 400    to get extra warnings from them.  These warnings will be too numerous
 401    to be useful, except in thoroughly ANSIfied programs.  */
 402
 403 extern int warn_write_strings;
 404
 405 /* Nonzero means warn about sizeof (function) or addition/subtraction
 406    of function pointers.  */
 407
 408 extern int warn_pointer_arith;
 409
 410 /* Nonzero means warn for all old-style non-prototype function decls.  */
 411
 412 extern int warn_strict_prototypes;
 413
 414 /* Nonzero means warn about multiple (redundant) decls for the same single
 415    variable or function.  */
 416
 417 extern int warn_redundant_decls;
 418
 419 /* Nonzero means warn about extern declarations of objects not at
 420    file-scope level and about *all* declarations of functions (whether
 421    extern or static) not at file-scope level.  Note that we exclude
 422    implicit function declarations.  To get warnings about those, use
 423    -Wimplicit.  */
 424
 425 extern int warn_nested_externs;
 426
 427 /* Nonzero means warn about pointer casts that can drop a type qualifier
 428    from the pointer target type.  */
 429
 430 extern int warn_cast_qual;
 431
 432 /* Warn about traditional constructs whose meanings changed in ANSI C.  */
 433
 434 extern int warn_traditional;
 435
 436 /* Warn about *printf or *scanf format/argument anomalies. */
 437
 438 extern int warn_format;
 439
 440 /* Warn about a subscript that has type char.  */
 441
 442 extern int warn_char_subscripts;
 443
 444 /* Warn if a type conversion is done that might have confusing results.  */
 445
 446 extern int warn_conversion;
 447
 448 /* Nonzero means do some things the same way PCC does.  */
 449
 450 extern int flag_traditional;
 451
 452 /* Nonzero means to allow single precision math even if we're generally
 453    being traditional. */
 454 extern int flag_allow_single_precision;
 455
 456 /* Nonzero means warn about suggesting putting in ()'s.  */
 457
 458 extern int warn_parentheses;
 459
 460 /* Warn if initializer is not completely bracketed.  */
 461
 462 extern int warn_missing_braces;
 463
 464 /* Nonzero means this is a function to call to perform comptypes
 465    on two record types.  */
 466
 467 extern int (*comptypes_record_hook) ();
 468
 469 /* Nonzero means we are reading code that came from a system header file.  */
 470
 471 extern int system_header_p;
 472
 473 /* Nonzero enables objc features.  */
 474
 475 extern int doing_objc_thang;
 476
 477 #endif /* not _C_TREE_H */