gcc/c-tree.h

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