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 extern int maybe_objc_comptypes                 PROTO((tree, tree));
 153 extern tree maybe_building_objc_message_expr    PROTO((void));
 154 \f
 155 /* in c-aux-info.c */
 156 extern void gen_aux_info_record                 PROTO((tree, int, int, int));
 157
 158 /* in c-common.c */
 159 /* Print an error message for invalid operands to arith operation CODE.
 160    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 161 extern void binary_op_error                     PROTO((enum tree_code));
 162 extern void c_expand_expr_stmt                  PROTO((tree));
 163 /* Validate the expression after `case' and apply default promotions.  */
 164 extern tree check_case_value                    PROTO((tree));
 165 /* Concatenate a list of STRING_CST nodes into one STRING_CST.  */
 166 extern tree combine_strings                     PROTO((tree));
 167 extern void constant_expression_warning         PROTO((tree));
 168 extern void decl_attributes                     PROTO((tree, tree));
 169 extern void declare_function_name               PROTO((void));
 170 extern tree convert_and_check                   PROTO((tree, tree));
 171 extern void constant_expression_warning         PROTO((tree));
 172 extern void overflow_warning                    PROTO((tree));
 173 extern void unsigned_conversion_warning         PROTO((tree, tree));
 174 /* Read the rest of the current #-directive line.  */
 175 extern char *get_directive_line                 STDIO_PROTO((FILE *));
 176 /* Subroutine of build_binary_op, used for comparison operations.
 177    See if the operands have both been converted from subword integer types
 178    and, if so, perhaps change them both back to their original type.  */
 179 extern tree shorten_compare                     PROTO((tree *, tree *, tree *, enum tree_code *));
 180 /* Prepare expr to be an argument of a TRUTH_NOT_EXPR,
 181    or validate its data type for an `if' or `while' statement or ?..: exp. */
 182 extern tree truthvalue_conversion               PROTO((tree));
 183 extern tree type_for_mode                       PROTO((enum machine_mode, int));
 184 extern tree type_for_size                       PROTO((unsigned, int));
 185
 186 /* in c-convert.c */
 187 extern tree convert                             PROTO((tree, tree));
 188
 189 /* in c-decl.c */
 190 /* Standard named or nameless data types of the C compiler.  */
 191 extern tree char_array_type_node;
 192 extern tree char_type_node;
 193 extern tree const_ptr_type_node;
 194 extern tree const_string_type_node;
 195 extern tree default_function_type;
 196 extern tree double_ftype_double;
 197 extern tree double_ftype_double_double;
 198 extern tree double_type_node;
 199 extern tree float_type_node;
 200 extern tree intDI_type_node;
 201 extern tree intHI_type_node;
 202 extern tree intQI_type_node;
 203 extern tree intSI_type_node;
 204 extern tree int_array_type_node;
 205 extern tree int_ftype_cptr_cptr_sizet;
 206 extern tree int_ftype_int;
 207 extern tree int_ftype_ptr_ptr_int;
 208 extern tree int_ftype_string_string;
 209 extern tree integer_type_node;
 210 extern tree long_double_type_node;
 211 extern tree long_ftype_long;
 212 extern tree long_integer_type_node;
 213 extern tree long_long_integer_type_node;
 214 extern tree long_long_unsigned_type_node;
 215 extern tree long_unsigned_type_node;
 216 extern tree complex_integer_type_node;
 217 extern tree complex_float_type_node;
 218 extern tree complex_double_type_node;
 219 extern tree complex_long_double_type_node;
 220 extern tree ptr_type_node;
 221 extern tree ptrdiff_type_node;
 222 extern tree short_integer_type_node;
 223 extern tree short_unsigned_type_node;
 224 extern tree signed_char_type_node;
 225 extern tree signed_wchar_type_node;
 226 extern tree string_ftype_ptr_ptr;
 227 extern tree string_type_node;
 228 extern tree unsigned_char_type_node;
 229 extern tree unsigned_intDI_type_node;
 230 extern tree unsigned_intHI_type_node;
 231 extern tree unsigned_intQI_type_node;
 232 extern tree unsigned_intSI_type_node;
 233 extern tree unsigned_type_node;
 234 extern tree unsigned_wchar_type_node;
 235 extern tree void_ftype_ptr_int_int;
 236 extern tree void_ftype_ptr_ptr_int;
 237 extern tree void_type_node;
 238 extern tree wchar_array_type_node;
 239 extern tree wchar_type_node;
 240
 241 extern tree build_enumerator                    PROTO((tree, tree));
 242 /* Declare a predefined function.  Return the declaration.  */
 243 extern tree builtin_function                    PROTO((char *, tree, enum built_in_function function_, char *));
 244 /* Add qualifiers to a type, in the fashion for C.  */
 245 extern tree c_build_type_variant                PROTO((tree, int, int));
 246 extern int  c_decode_option                     PROTO((char *));
 247 extern void c_mark_varargs                      PROTO((void));
 248 extern tree check_identifier                    PROTO((tree, tree));
 249 extern void clear_parm_order                    PROTO((void));
 250 extern tree combine_parm_decls                  PROTO((tree, tree, int));
 251 extern int  complete_array_type                 PROTO((tree, tree, int));
 252 extern void declare_parm_level                  PROTO((int));
 253 extern tree define_label                        PROTO((char *, int, tree));
 254 extern void delete_block                        PROTO((tree));
 255 extern void finish_decl                         PROTO((tree, tree, tree));
 256 extern tree finish_enum                         PROTO((tree, tree));
 257 extern void finish_function                     PROTO((int));
 258 extern tree finish_struct                       PROTO((tree, tree));
 259 extern tree get_parm_info                       PROTO((int));
 260 extern tree getdecls                            PROTO((void));
 261 extern tree gettags                             PROTO((void));
 262 extern int  global_bindings_p                   PROTO((void));
 263 extern tree grokfield                           PROTO((char *, int, tree, tree, tree));
 264 extern tree groktypename                        PROTO((tree));
 265 extern tree groktypename_in_parm_context        PROTO((tree));
 266 extern tree implicitly_declare                  PROTO((tree));
 267 extern int  in_parm_level_p                     PROTO((void));
 268 extern void init_decl_processing                PROTO((void));
 269 extern void insert_block                        PROTO((tree));
 270 extern void keep_next_level                     PROTO((void));
 271 extern int  kept_level_p                        PROTO((void));
 272 extern tree lookup_label                        PROTO((tree));
 273 extern tree lookup_name                         PROTO((tree));
 274 extern tree lookup_name_current_level           PROTO((tree));
 275 extern tree maybe_build_cleanup                 PROTO((tree));
 276 extern void parmlist_tags_warning               PROTO((void));
 277 extern void pending_xref_error                  PROTO((void));
 278 extern void pop_c_function_context              PROTO((void));
 279 extern void pop_label_level                     PROTO((void));
 280 extern tree poplevel                            PROTO((int, int, int));
 281 extern void print_lang_decl                     PROTO((void));
 282 extern void print_lang_identifier               STDIO_PROTO((FILE *, tree,
 283                                                              int));
 284 extern void print_lang_type                     PROTO((void));
 285 extern void push_c_function_context             PROTO((void));
 286 extern void push_label_level                    PROTO((void));
 287 extern void push_parm_decl                      PROTO((tree));
 288 extern tree pushdecl                            PROTO((tree));
 289 extern tree pushdecl_top_level                  PROTO((tree));
 290 extern void pushlevel                           PROTO((int));
 291 extern void pushtag                             PROTO((tree, tree));
 292 extern void set_block                           PROTO((tree));
 293 extern tree shadow_label                        PROTO((tree));
 294 extern void shadow_record_fields                PROTO((tree));
 295 extern void shadow_tag                          PROTO((tree));
 296 extern void shadow_tag_warned                   PROTO((tree, int));
 297 extern tree start_enum                          PROTO((tree));
 298 extern int  start_function                      PROTO((tree, tree, int));
 299 extern tree start_decl                          PROTO((tree, tree, int));
 300 extern tree start_struct                        PROTO((enum tree_code, tree));
 301 extern void store_parm_decls                    PROTO((void));
 302 extern tree xref_tag                            PROTO((enum tree_code, tree));
 303
 304 /* in c-typeck.c */
 305 extern tree build_array_ref                     PROTO((tree, tree));
 306 extern tree build_binary_op                     PROTO((enum tree_code, tree, tree, int));
 307 extern tree build_c_cast                        PROTO((tree, tree));
 308 extern tree build_component_ref                 PROTO((tree, tree));
 309 extern tree build_compound_expr                 PROTO((tree));
 310 extern tree build_conditional_expr              PROTO((tree, tree, tree));
 311 extern tree build_function_call                 PROTO((tree, tree));
 312 extern tree build_indirect_ref                  PROTO((tree, char *));
 313 extern tree build_modify_expr                   PROTO((tree, enum tree_code, tree));
 314 extern tree build_unary_op                      PROTO((enum tree_code, tree, int));
 315 extern tree c_alignof                           PROTO((tree));
 316 extern tree c_alignof_expr                      PROTO((tree));
 317 extern tree c_sizeof                            PROTO((tree));
 318 extern tree c_expand_start_case                 PROTO((tree));
 319 /* Given two integer or real types, return the type for their sum.
 320    Given two compatible ANSI C types, returns the merged type.  */
 321 extern tree common_type                         PROTO((tree, tree));
 322 extern tree default_conversion                  PROTO((tree));
 323 extern tree digest_init                         PROTO((tree, tree, tree *, int, int, char *));
 324 extern tree parser_build_binary_op              PROTO((enum tree_code, tree, tree));
 325 extern tree require_complete_type               PROTO((tree));
 326 extern void store_init_value                    PROTO((tree, tree));
 327
 328 /* in c-iterate.c */
 329 extern void iterator_expand                     PROTO((tree));
 330 extern void iterator_for_loop_start             PROTO((tree));
 331 extern void iterator_for_loop_end               PROTO((tree));
 332 extern void iterator_for_loop_record            PROTO((tree));
 333 extern void push_iterator_stack                 PROTO((void));
 334 extern void pop_iterator_stack                  PROTO((void));
 335
 336 /* Set to 0 at beginning of a function definition, set to 1 if
 337    a return statement that specifies a return value is seen.  */
 338
 339 extern int current_function_returns_value;
 340
 341 /* Set to 0 at beginning of a function definition, set to 1 if
 342    a return statement with no argument is seen.  */
 343
 344 extern int current_function_returns_null;
 345
 346 /* Nonzero means `$' can be in an identifier.  */
 347
 348 extern int dollars_in_ident;
 349
 350 /* Nonzero means allow type mismatches in conditional expressions;
 351    just make their values `void'.   */
 352
 353 extern int flag_cond_mismatch;
 354
 355 /* Nonzero means don't recognize the keyword `asm'.  */
 356
 357 extern int flag_no_asm;
 358
 359 /* Nonzero means ignore `#ident' directives.  */
 360
 361 extern int flag_no_ident;
 362
 363 /* Nonzero means warn about implicit declarations.  */
 364
 365 extern int warn_implicit;
 366
 367 /* Nonzero means give string constants the type `const char *'
 368    to get extra warnings from them.  These warnings will be too numerous
 369    to be useful, except in thoroughly ANSIfied programs.  */
 370
 371 extern int warn_write_strings;
 372
 373 /* Nonzero means warn about sizeof (function) or addition/subtraction
 374    of function pointers.  */
 375
 376 extern int warn_pointer_arith;
 377
 378 /* Nonzero means warn for all old-style non-prototype function decls.  */
 379
 380 extern int warn_strict_prototypes;
 381
 382 /* Nonzero means warn about multiple (redundant) decls for the same single
 383    variable or function.  */
 384
 385 extern int warn_redundant_decls;
 386
 387 /* Nonzero means warn about extern declarations of objects not at
 388    file-scope level and about *all* declarations of functions (whether
 389    extern or static) not at file-scope level.  Note that we exclude
 390    implicit function declarations.  To get warnings about those, use
 391    -Wimplicit.  */
 392
 393 extern int warn_nested_externs;
 394
 395 /* Nonzero means warn about pointer casts that can drop a type qualifier
 396    from the pointer target type.  */
 397
 398 extern int warn_cast_qual;
 399
 400 /* Warn about traditional constructs whose meanings changed in ANSI C.  */
 401
 402 extern int warn_traditional;
 403
 404 /* Warn about *printf or *scanf format/argument anomalies. */
 405
 406 extern int warn_format;
 407
 408 /* Warn about a subscript that has type char.  */
 409
 410 extern int warn_char_subscripts;
 411
 412 /* Warn if a type conversion is done that might have confusing results.  */
 413
 414 extern int warn_conversion;
 415
 416 /* Nonzero means do some things the same way PCC does.  */
 417
 418 extern int flag_traditional;
 419
 420 /* Nonzero means warn about suggesting putting in ()'s.  */
 421
 422 extern int warn_parentheses;
 423
 424 /* Warn if initializer is not completely bracketed.  */
 425
 426 extern int warn_missing_braces;
 427
 428 /* Nonzero means this is a function to call to perform comptypes
 429    on two record types.  */
 430
 431 extern int (*comptypes_record_hook) ();
 432
 433 /* Nonzero means we are reading code that came from a system header file.  */
 434
 435 extern int system_header_p;
 436
 437 #endif /* not _C_TREE_H */