gcc/c-tree.h

   1 /* Definitions for C parsing and type checking.
   2    Copyright (C) 1987, 1993, 1994, 1995, 1997 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, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 #ifndef _C_TREE_H
  22 #define _C_TREE_H
  23
  24 /* Language-dependent contents of an identifier.  */
  25
  26 /* The limbo_value is used for block level extern declarations, which need
  27    to be type checked against subsequent extern declarations.  They can't
  28    be referenced after they fall out of scope, so they can't be global.  */
  29
  30 struct lang_identifier
  31 {
  32   struct tree_identifier ignore;
  33   tree global_value, local_value, label_value, implicit_decl;
  34   tree error_locus, limbo_value;
  35 };
  36
  37 /* Macros for access to language-specific slots in an identifier.  */
  38 /* Each of these slots contains a DECL node or null.  */
  39
  40 /* This represents the value which the identifier has in the
  41    file-scope namespace.  */
  42 #define IDENTIFIER_GLOBAL_VALUE(NODE)   \
  43   (((struct lang_identifier *) (NODE))->global_value)
  44 /* This represents the value which the identifier has in the current
  45    scope.  */
  46 #define IDENTIFIER_LOCAL_VALUE(NODE)    \
  47   (((struct lang_identifier *) (NODE))->local_value)
  48 /* This represents the value which the identifier has as a label in
  49    the current label scope.  */
  50 #define IDENTIFIER_LABEL_VALUE(NODE)    \
  51   (((struct lang_identifier *) (NODE))->label_value)
  52 /* This records the extern decl of this identifier, if it has had one
  53    at any point in this compilation.  */
  54 #define IDENTIFIER_LIMBO_VALUE(NODE)    \
  55   (((struct lang_identifier *) (NODE))->limbo_value)
  56 /* This records the implicit function decl of this identifier, if it
  57    has had one at any point in this compilation.  */
  58 #define IDENTIFIER_IMPLICIT_DECL(NODE)  \
  59   (((struct lang_identifier *) (NODE))->implicit_decl)
  60 /* This is the last function in which we printed an "undefined variable"
  61    message for this identifier.  Value is a FUNCTION_DECL or null.  */
  62 #define IDENTIFIER_ERROR_LOCUS(NODE)    \
  63   (((struct lang_identifier *) (NODE))->error_locus)
  64
  65 /* In identifiers, C uses the following fields in a special way:
  66    TREE_PUBLIC        to record that there was a previous local extern decl.
  67    TREE_USED          to record that such a decl was used.
  68    TREE_ADDRESSABLE   to record that the address of such a decl was used.  */
  69
  70 /* Nonzero means reject anything that ANSI standard C forbids.  */
  71 extern int pedantic;
  72
  73 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only.  */
  74 #define C_TYPE_FIELDS_READONLY(type) TREE_LANG_FLAG_1 (type)
  75
  76 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile.  */
  77 #define C_TYPE_FIELDS_VOLATILE(type) TREE_LANG_FLAG_2 (type)
  78
  79 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
  80    nonzero if the definition of the type has already started.  */
  81 #define C_TYPE_BEING_DEFINED(type) TYPE_LANG_FLAG_0 (type)
  82
  83 /* In a RECORD_TYPE, a sorted array of the fields of the type.  */
  84 struct lang_type
  85 {
  86   int len;
  87   tree elts[1];
  88 };
  89
  90 /* Mark which labels are explicitly declared.
  91    These may be shadowed, and may be referenced from nested functions.  */
  92 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
  93
  94 /* Record whether a type or decl was written with nonconstant size.
  95    Note that TYPE_SIZE may have simplified to a constant.  */
  96 #define C_TYPE_VARIABLE_SIZE(type) TYPE_LANG_FLAG_1 (type)
  97 #define C_DECL_VARIABLE_SIZE(type) DECL_LANG_FLAG_0 (type)
  98
  99 /* Record in each node resulting from a binary operator
 100    what operator was specified for it.  */
 101 #define C_EXP_ORIGINAL_CODE(exp) ((enum tree_code) TREE_COMPLEXITY (exp))
 102
 103 #if 0 /* Not used.  */
 104 /* Record whether a decl for a function or function pointer has
 105    already been mentioned (in a warning) because it was called
 106    but didn't have a prototype.  */
 107 #define C_MISSING_PROTOTYPE_WARNED(decl) DECL_LANG_FLAG_2(decl)
 108 #endif
 109
 110 /* Store a value in that field.  */
 111 #define C_SET_EXP_ORIGINAL_CODE(exp, code) \
 112   (TREE_COMPLEXITY (exp) = (int) (code))
 113
 114 /* Record whether a typedef for type `int' was actually `signed int'.  */
 115 #define C_TYPEDEF_EXPLICITLY_SIGNED(exp) DECL_LANG_FLAG_1 ((exp))
 116
 117 /* Nonzero for a declaration of a built in function if there has been no
 118    occasion that would declare the function in ordinary C.
 119    Using the function draws a pedantic warning in this case.  */
 120 #define C_DECL_ANTICIPATED(exp) DECL_LANG_FLAG_3 ((exp))
 121
 122 /* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
 123    TYPE_ARG_TYPES for functions with prototypes, but created for functions
 124    without prototypes.  */
 125 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_NONCOPIED_PARTS (NODE)
 126
 127 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
 128 #define DECL_C_BIT_FIELD(NODE) DECL_LANG_FLAG_4 (NODE)
 129
 130 /* Nonzero if the type T promotes to itself.
 131    ANSI C states explicitly the list of types that promote;
 132    in particular, short promotes to int even if they have the same width.  */
 133 #define C_PROMOTING_INTEGER_TYPE_P(t)                           \
 134   (TREE_CODE ((t)) == INTEGER_TYPE                              \
 135    && (TYPE_MAIN_VARIANT (t) == char_type_node                  \
 136        || TYPE_MAIN_VARIANT (t) == signed_char_type_node        \
 137        || TYPE_MAIN_VARIANT (t) == unsigned_char_type_node      \
 138        || TYPE_MAIN_VARIANT (t) == short_integer_type_node      \
 139        || TYPE_MAIN_VARIANT (t) == short_unsigned_type_node))
 140
 141 /* In a VAR_DECL, means the variable is really an iterator.  */
 142 #define ITERATOR_P(D) (DECL_LANG_FLAG_4(D))
 143
 144 /* In a VAR_DECL for an iterator, means we are within
 145    an explicit loop over that iterator.  */
 146 #define ITERATOR_BOUND_P(NODE) ((NODE)->common.readonly_flag)
 147 \f
 148 /* in c-lang.c and objc-act.c */
 149 extern tree lookup_interface                    PROTO((tree));
 150 extern tree is_class_name                       PROTO((tree));
 151 extern void maybe_objc_check_decl               PROTO((tree));
 152 extern int maybe_objc_comptypes                 PROTO((tree, tree, int));
 153 extern tree maybe_building_objc_message_expr    PROTO((void));
 154 extern tree maybe_objc_method_name              PROTO((tree));
 155 extern int recognize_objc_keyword               PROTO((void));
 156 extern tree build_objc_string                   PROTO((int, char *));
 157 \f
 158 /* in c-aux-info.c */
 159 extern void gen_aux_info_record                 PROTO((tree, int, int, int));
 160
 161 /* in c-common.c */
 162 extern void declare_function_name               PROTO((void));
 163 extern void decl_attributes                     PROTO((tree, tree, tree));
 164 extern void init_function_format_info           PROTO((void));
 165 extern void record_function_format              PROTO((tree, tree, int, int, int));
 166 extern void check_function_format               PROTO((tree, tree, tree));
 167 /* Print an error message for invalid operands to arith operation CODE.
 168    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 169 extern void binary_op_error                     PROTO((enum tree_code));
 170 extern void c_expand_expr_stmt                  PROTO((tree));
 171 /* Validate the expression after `case' and apply default promotions.  */
 172 extern tree check_case_value                    PROTO((tree));
 173 /* Concatenate a list of STRING_CST nodes into one STRING_CST.  */
 174 extern tree combine_strings                     PROTO((tree));
 175 extern void constant_expression_warning         PROTO((tree));
 176 extern tree convert_and_check                   PROTO((tree, tree));
 177 extern void overflow_warning                    PROTO((tree));
 178 extern void unsigned_conversion_warning         PROTO((tree, tree));
 179 /* Read the rest of the current #-directive line.  */
 180 extern char *get_directive_line                 STDIO_PROTO((FILE *));
 181 /* Subroutine of build_binary_op, used for comparison operations.
 182    See if the operands have both been converted from subword integer types
 183    and, if so, perhaps change them both back to their original type.  */
 184 extern tree shorten_compare                     PROTO((tree *, tree *, tree *, enum tree_code *));
 185 /* Prepare expr to be an argument of a TRUTH_NOT_EXPR,
 186    or validate its data type for an `if' or `while' statement or ?..: exp. */
 187 extern tree truthvalue_conversion               PROTO((tree));
 188 extern tree type_for_mode                       PROTO((enum machine_mode, int));
 189 extern tree type_for_size                       PROTO((unsigned, int));
 190
 191 /* in c-convert.c */
 192 extern tree convert                             PROTO((tree, tree));
 193
 194 /* in c-decl.c */
 195 /* Standard named or nameless data types of the C compiler.  */
 196 extern tree char_array_type_node;
 197 extern tree char_type_node;
 198 extern tree const_ptr_type_node;
 199 extern tree const_string_type_node;
 200 extern tree default_function_type;
 201 extern tree double_ftype_double;
 202 extern tree double_ftype_double_double;
 203 extern tree double_type_node;
 204 extern tree float_type_node;
 205 extern tree intDI_type_node;
 206 extern tree intHI_type_node;
 207 extern tree intQI_type_node;
 208 extern tree intSI_type_node;
 209 extern tree int_array_type_node;
 210 extern tree int_ftype_cptr_cptr_sizet;
 211 extern tree int_ftype_int;
 212 extern tree int_ftype_ptr_ptr_int;
 213 extern tree int_ftype_string_string;
 214 extern tree integer_type_node;
 215 extern tree long_double_type_node;
 216 extern tree long_ftype_long;
 217 extern tree long_integer_type_node;
 218 extern tree long_long_integer_type_node;
 219 extern tree long_long_unsigned_type_node;
 220 extern tree long_unsigned_type_node;
 221 extern tree complex_integer_type_node;
 222 extern tree complex_float_type_node;
 223 extern tree complex_double_type_node;
 224 extern tree complex_long_double_type_node;
 225 extern tree ptr_type_node;
 226 extern tree ptrdiff_type_node;
 227 extern tree short_integer_type_node;
 228 extern tree short_unsigned_type_node;
 229 extern tree signed_char_type_node;
 230 extern tree signed_wchar_type_node;
 231 extern tree string_ftype_ptr_ptr;
 232 extern tree string_type_node;
 233 extern tree unsigned_char_type_node;
 234 extern tree unsigned_intDI_type_node;
 235 extern tree unsigned_intHI_type_node;
 236 extern tree unsigned_intQI_type_node;
 237 extern tree unsigned_intSI_type_node;
 238 extern tree unsigned_type_node;
 239 extern tree unsigned_wchar_type_node;
 240 extern tree void_ftype_ptr_int_int;
 241 extern tree void_ftype_ptr_ptr_int;
 242 extern tree void_type_node;
 243 extern tree wchar_array_type_node;
 244 extern tree wchar_type_node;
 245 extern tree boolean_type_node;
 246 extern tree boolean_true_node;
 247 extern tree boolean_false_node;
 248
 249 extern tree build_enumerator                    PROTO((tree, tree));
 250 /* Declare a predefined function.  Return the declaration.  */
 251 extern tree builtin_function                    PROTO((char *, tree, enum built_in_function function_, char *));
 252 /* Add qualifiers to a type, in the fashion for C.  */
 253 extern tree c_build_type_variant                PROTO((tree, int, int));
 254 extern int  c_decode_option                     PROTO((char *));
 255 extern void c_mark_varargs                      PROTO((void));
 256 extern tree check_identifier                    PROTO((tree, tree));
 257 extern void clear_parm_order                    PROTO((void));
 258 extern tree combine_parm_decls                  PROTO((tree, tree, int));
 259 extern int  complete_array_type                 PROTO((tree, tree, int));
 260 extern void declare_parm_level                  PROTO((int));
 261 extern tree define_label                        PROTO((char *, int, tree));
 262 extern void delete_block                        PROTO((tree));
 263 extern void finish_decl                         PROTO((tree, tree, tree));
 264 extern void finish_decl_top_level               PROTO((tree, tree, tree));
 265 extern tree finish_enum                         PROTO((tree, tree, tree));
 266 extern void finish_function                     PROTO((int));
 267 extern tree finish_struct                       PROTO((tree, tree, tree));
 268 extern tree get_parm_info                       PROTO((int));
 269 extern tree getdecls                            PROTO((void));
 270 extern tree gettags                             PROTO((void));
 271 extern int  global_bindings_p                   PROTO((void));
 272 extern tree grokfield                           PROTO((char *, int, tree, tree, tree));
 273 extern tree groktypename                        PROTO((tree));
 274 extern tree groktypename_in_parm_context        PROTO((tree));
 275 extern tree implicitly_declare                  PROTO((tree));
 276 extern int  in_parm_level_p                     PROTO((void));
 277 extern void init_decl_processing                PROTO((void));
 278 extern void insert_block                        PROTO((tree));
 279 extern void keep_next_level                     PROTO((void));
 280 extern int  kept_level_p                        PROTO((void));
 281 extern tree lookup_label                        PROTO((tree));
 282 extern tree lookup_name                         PROTO((tree));
 283 extern tree lookup_name_current_level           PROTO((tree));
 284 extern tree lookup_name_current_level_global    PROTO((tree));
 285 extern tree maybe_build_cleanup                 PROTO((tree));
 286 extern void parmlist_tags_warning               PROTO((void));
 287 extern void pending_xref_error                  PROTO((void));
 288 extern void pop_c_function_context              PROTO((void));
 289 extern void pop_label_level                     PROTO((void));
 290 extern tree poplevel                            PROTO((int, int, int));
 291 extern void print_lang_decl                     STDIO_PROTO((FILE *, tree,
 292                                                              int));
 293 extern void print_lang_identifier               STDIO_PROTO((FILE *, tree,
 294                                                              int));
 295 extern void print_lang_type                     STDIO_PROTO((FILE *, tree,
 296                                                              int));
 297 extern void push_c_function_context             PROTO((void));
 298 extern void push_label_level                    PROTO((void));
 299 extern void push_parm_decl                      PROTO((tree));
 300 extern tree pushdecl                            PROTO((tree));
 301 extern tree pushdecl_top_level                  PROTO((tree));
 302 extern void pushlevel                           PROTO((int));
 303 extern void pushtag                             PROTO((tree, tree));
 304 extern void set_block                           PROTO((tree));
 305 extern tree shadow_label                        PROTO((tree));
 306 extern void shadow_record_fields                PROTO((tree));
 307 extern void shadow_tag                          PROTO((tree));
 308 extern void shadow_tag_warned                   PROTO((tree, int));
 309 extern tree start_enum                          PROTO((tree));
 310 extern int  start_function                      PROTO((tree, tree, tree,
 311                                                        tree, int));
 312 extern tree start_decl                          PROTO((tree, tree, int,
 313                                                        tree, tree));
 314 extern tree start_struct                        PROTO((enum tree_code, tree));
 315 extern void store_parm_decls                    PROTO((void));
 316 extern tree xref_tag                            PROTO((enum tree_code, tree));
 317
 318 /* in c-typeck.c */
 319 extern tree require_complete_type               PROTO((tree));
 320 extern void incomplete_type_error               PROTO((tree, tree));
 321 /* Given two integer or real types, return the type for their sum.
 322    Given two compatible ANSI C types, returns the merged type.  */
 323 extern tree common_type                         PROTO((tree, tree));
 324 extern int comptypes                            PROTO((tree, tree));
 325 extern int self_promoting_args_p                PROTO((tree));
 326 extern tree c_sizeof                            PROTO((tree));
 327 extern tree c_sizeof_nowarn                     PROTO((tree));
 328 extern tree c_size_in_bytes                     PROTO((tree));
 329 extern tree c_alignof                           PROTO((tree));
 330 extern tree c_alignof_expr                      PROTO((tree));
 331 extern tree default_conversion                  PROTO((tree));
 332 extern tree build_component_ref                 PROTO((tree, tree));
 333 extern tree build_indirect_ref                  PROTO((tree, char *));
 334 extern tree build_array_ref                     PROTO((tree, tree));
 335 extern tree build_function_call                 PROTO((tree, tree));
 336 extern tree parser_build_binary_op              PROTO((enum tree_code,
 337                                                        tree, tree));
 338 extern tree build_binary_op                     PROTO((enum tree_code,
 339                                                        tree, tree, int));
 340 extern tree build_unary_op                      PROTO((enum tree_code,
 341                                                        tree, int));
 342 extern int lvalue_p                             PROTO((tree));
 343 extern int lvalue_or_else                       PROTO((tree, char *));
 344 extern void readonly_warning                    PROTO((tree, char *));
 345 extern int mark_addressable                     PROTO((tree));
 346 extern tree build_conditional_expr              PROTO((tree, tree, tree));
 347 extern tree build_compound_expr                 PROTO((tree));
 348 extern tree build_c_cast                        PROTO((tree, tree));
 349 extern tree build_modify_expr                   PROTO((tree, enum tree_code,
 350                                                        tree));
 351 extern tree initializer_constant_valid_p        PROTO((tree, tree));
 352 extern void store_init_value                    PROTO((tree, tree));
 353 extern void error_init                          PROTO((char *, char *,
 354                                                        char *));
 355 extern void pedwarn_init                        PROTO((char *, char *,
 356                                                        char *));
 357 extern void start_init                          PROTO((tree, tree, int));
 358 extern void finish_init                         PROTO((void));
 359 extern void really_start_incremental_init       PROTO((tree));
 360 extern void push_init_level                     PROTO((int));
 361 extern tree pop_init_level                      PROTO((int));
 362 extern void set_init_index                      PROTO((tree, tree));
 363 extern void set_init_label                      PROTO((tree));
 364 extern void process_init_element                PROTO((tree));
 365 extern void c_expand_asm_operands               PROTO((tree, tree, tree, tree,
 366                                                        int, char *, int));
 367 extern void c_expand_return                     PROTO((tree));
 368 extern tree c_expand_start_case                 PROTO((tree));
 369
 370 /* in c-iterate.c */
 371 extern void iterator_expand                     PROTO((tree));
 372 extern void iterator_for_loop_start             PROTO((tree));
 373 extern void iterator_for_loop_end               PROTO((tree));
 374 extern void iterator_for_loop_record            PROTO((tree));
 375 extern void push_iterator_stack                 PROTO((void));
 376 extern void pop_iterator_stack                  PROTO((void));
 377
 378 /* Set to 0 at beginning of a function definition, set to 1 if
 379    a return statement that specifies a return value is seen.  */
 380
 381 extern int current_function_returns_value;
 382
 383 /* Set to 0 at beginning of a function definition, set to 1 if
 384    a return statement with no argument is seen.  */
 385
 386 extern int current_function_returns_null;
 387
 388 /* Nonzero means the expression being parsed will never be evaluated.
 389    This is a count, since unevaluated expressions can nest.  */
 390
 391 extern int skip_evaluation;
 392
 393 /* Nonzero means `$' can be in an identifier.  */
 394
 395 extern int dollars_in_ident;
 396
 397 /* Nonzero means allow type mismatches in conditional expressions;
 398    just make their values `void'.   */
 399
 400 extern int flag_cond_mismatch;
 401
 402 /* Nonzero means don't recognize the keyword `asm'.  */
 403
 404 extern int flag_no_asm;
 405
 406 /* Nonzero means environment is hosted (i.e., not freestanding) */
 407
 408 extern int flag_hosted;
 409
 410 /* Nonzero means ignore `#ident' directives.  */
 411
 412 extern int flag_no_ident;
 413
 414 /* Nonzero means warn about implicit declarations.  */
 415
 416 extern int warn_implicit;
 417
 418 /* Nonzero means give string constants the type `const char *'
 419    to get extra warnings from them.  These warnings will be too numerous
 420    to be useful, except in thoroughly ANSIfied programs.  */
 421
 422 extern int warn_write_strings;
 423
 424 /* Nonzero means warn about sizeof (function) or addition/subtraction
 425    of function pointers.  */
 426
 427 extern int warn_pointer_arith;
 428
 429 /* Nonzero means warn for all old-style non-prototype function decls.  */
 430
 431 extern int warn_strict_prototypes;
 432
 433 /* Nonzero means warn about multiple (redundant) decls for the same single
 434    variable or function.  */
 435
 436 extern int warn_redundant_decls;
 437
 438 /* Nonzero means warn about extern declarations of objects not at
 439    file-scope level and about *all* declarations of functions (whether
 440    extern or static) not at file-scope level.  Note that we exclude
 441    implicit function declarations.  To get warnings about those, use
 442    -Wimplicit.  */
 443
 444 extern int warn_nested_externs;
 445
 446 /* Nonzero means warn about pointer casts that can drop a type qualifier
 447    from the pointer target type.  */
 448
 449 extern int warn_cast_qual;
 450
 451 /* Nonzero means warn when casting a function call to a type that does
 452    not match the return type (e.g. (float)sqrt() or (anything*)malloc()
 453    when there is no previous declaration of sqrt or malloc.  */
 454
 455 extern int warn_bad_function_cast;
 456
 457 /* Warn about traditional constructs whose meanings changed in ANSI C.  */
 458
 459 extern int warn_traditional;
 460
 461 /* Warn about *printf or *scanf format/argument anomalies. */
 462
 463 extern int warn_format;
 464
 465 /* Warn about a subscript that has type char.  */
 466
 467 extern int warn_char_subscripts;
 468
 469 /* Warn if a type conversion is done that might have confusing results.  */
 470
 471 extern int warn_conversion;
 472
 473 /* Warn if main is suspicious. */
 474
 475 extern int warn_main;
 476
 477 /* Nonzero means do some things the same way PCC does.  */
 478
 479 extern int flag_traditional;
 480
 481 /* Nonzero means to allow single precision math even if we're generally
 482    being traditional. */
 483 extern int flag_allow_single_precision;
 484
 485 /* Nonzero means warn about suggesting putting in ()'s.  */
 486
 487 extern int warn_parentheses;
 488
 489 /* Warn if initializer is not completely bracketed.  */
 490
 491 extern int warn_missing_braces;
 492
 493 /* Warn about comparison of signed and unsigned values.  */
 494
 495 extern int warn_sign_compare;
 496
 497 /* Nonzero means this is a function to call to perform comptypes
 498    on two record types.  */
 499
 500 extern int (*comptypes_record_hook) ();
 501
 502 /* Nonzero means we are reading code that came from a system header file.  */
 503
 504 extern int system_header_p;
 505
 506 /* Nonzero enables objc features.  */
 507
 508 extern int doing_objc_thang;
 509
 510 #endif /* not _C_TREE_H */