gcc/c-tree.h

   1 /* Definitions for C parsing and type checking.
   2    Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998,
   3    1999, 2000, 2001, 2002 Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to the Free
  19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20 02111-1307, USA.  */
  21
  22 #ifndef GCC_C_TREE_H
  23 #define GCC_C_TREE_H
  24
  25 #include "c-common.h"
  26
  27 /* Language-dependent contents of an identifier.  */
  28
  29 /* The limbo_value is used for block level extern declarations, which need
  30    to be type checked against subsequent extern declarations.  They can't
  31    be referenced after they fall out of scope, so they can't be global.
  32
  33    The rid_code field is used for keywords.  It is in all
  34    lang_identifier nodes, because some keywords are only special in a
  35    particular context.  */
  36
  37 struct lang_identifier
  38 {
  39   struct c_common_identifier ignore;
  40   tree global_value, local_value, label_value, implicit_decl;
  41   tree error_locus, limbo_value;
  42 };
  43
  44 /* Language-specific declaration information.  */
  45
  46 struct lang_decl
  47 {
  48   struct c_lang_decl base;
  49   /* The return types and parameter types may have variable size.
  50      This is a list of any SAVE_EXPRs that need to be evaluated to
  51      compute those sizes.  */
  52   tree pending_sizes;
  53 };
  54
  55 /* Macros for access to language-specific slots in an identifier.  */
  56 /* Each of these slots contains a DECL node or null.  */
  57
  58 /* This represents the value which the identifier has in the
  59    file-scope namespace.  */
  60 #define IDENTIFIER_GLOBAL_VALUE(NODE)   \
  61   (((struct lang_identifier *) (NODE))->global_value)
  62 /* This represents the value which the identifier has in the current
  63    scope.  */
  64 #define IDENTIFIER_LOCAL_VALUE(NODE)    \
  65   (((struct lang_identifier *) (NODE))->local_value)
  66 /* This represents the value which the identifier has as a label in
  67    the current label scope.  */
  68 #define IDENTIFIER_LABEL_VALUE(NODE)    \
  69   (((struct lang_identifier *) (NODE))->label_value)
  70 /* This records the extern decl of this identifier, if it has had one
  71    at any point in this compilation.  */
  72 #define IDENTIFIER_LIMBO_VALUE(NODE)    \
  73   (((struct lang_identifier *) (NODE))->limbo_value)
  74 /* This records the implicit function decl of this identifier, if it
  75    has had one at any point in this compilation.  */
  76 #define IDENTIFIER_IMPLICIT_DECL(NODE)  \
  77   (((struct lang_identifier *) (NODE))->implicit_decl)
  78 /* This is the last function in which we printed an "undefined variable"
  79    message for this identifier.  Value is a FUNCTION_DECL or null.  */
  80 #define IDENTIFIER_ERROR_LOCUS(NODE)    \
  81   (((struct lang_identifier *) (NODE))->error_locus)
  82
  83 /* In identifiers, C uses the following fields in a special way:
  84    TREE_PUBLIC        to record that there was a previous local extern decl.
  85    TREE_USED          to record that such a decl was used.
  86    TREE_ADDRESSABLE   to record that the address of such a decl was used.  */
  87
  88 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only.  */
  89 #define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1 (TYPE)
  90
  91 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile.  */
  92 #define C_TYPE_FIELDS_VOLATILE(TYPE) TREE_LANG_FLAG_2 (TYPE)
  93
  94 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
  95    nonzero if the definition of the type has already started.  */
  96 #define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE)
  97
  98 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
  99    keyword.  C_RID_CODE (node) is then the RID_* value of the keyword,
 100    and C_RID_YYCODE is the token number wanted by Yacc.  */
 101 #define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
 102
 103 /* This function was declared inline.  This flag controls the linkage
 104    semantics of 'inline'; whether or not the function is inlined is
 105    controlled by DECL_INLINE.  */
 106 #define DECL_DECLARED_INLINE_P(NODE) \
 107   (DECL_LANG_SPECIFIC (NODE)->base.declared_inline)
 108
 109 /* In a RECORD_TYPE, a sorted array of the fields of the type.  */
 110 struct lang_type
 111 {
 112   int len;
 113   tree elts[1];
 114 };
 115
 116 /* Record whether a type or decl was written with nonconstant size.
 117    Note that TYPE_SIZE may have simplified to a constant.  */
 118 #define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
 119 #define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
 120
 121 #if 0 /* Not used.  */
 122 /* Record whether a decl for a function or function pointer has
 123    already been mentioned (in a warning) because it was called
 124    but didn't have a prototype.  */
 125 #define C_MISSING_PROTOTYPE_WARNED(DECL) DECL_LANG_FLAG_2 (DECL)
 126 #endif
 127
 128 /* Store a value in that field.  */
 129 #define C_SET_EXP_ORIGINAL_CODE(EXP, CODE) \
 130   (TREE_COMPLEXITY (EXP) = (int) (CODE))
 131
 132 /* Record whether a typedef for type `int' was actually `signed int'.  */
 133 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
 134
 135 /* Nonzero for a declaration of a built in function if there has been no
 136    occasion that would declare the function in ordinary C.
 137    Using the function draws a pedantic warning in this case.  */
 138 #define C_DECL_ANTICIPATED(EXP) DECL_LANG_FLAG_3 (EXP)
 139
 140 /* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
 141    TYPE_ARG_TYPES for functions with prototypes, but created for functions
 142    without prototypes.  */
 143 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_BINFO (NODE)
 144
 145 \f
 146 /* in c-lang.c and objc-act.c */
 147 extern tree lookup_interface                    PARAMS ((tree));
 148 extern tree is_class_name                       PARAMS ((tree));
 149 extern void maybe_objc_check_decl               PARAMS ((tree));
 150 extern void finish_file                         PARAMS ((void));
 151 extern int maybe_objc_comptypes                 PARAMS ((tree, tree, int));
 152 extern tree maybe_building_objc_message_expr    PARAMS ((void));
 153 extern int recognize_objc_keyword               PARAMS ((void));
 154 extern tree lookup_objc_ivar                    PARAMS ((tree));
 155
 156 \f
 157 /* in c-parse.in */
 158 extern void c_parse_init                        PARAMS ((void));
 159 extern void c_set_yydebug                       PARAMS ((int));
 160 extern int yyparse_1                            PARAMS ((void));
 161
 162 /* in c-aux-info.c */
 163 extern void gen_aux_info_record                 PARAMS ((tree, int, int, int));
 164
 165 /* in c-decl.c */
 166 extern void c_init_decl_processing              PARAMS ((void));
 167 extern void c_print_identifier                  PARAMS ((FILE *, tree, int));
 168 extern tree build_array_declarator              PARAMS ((tree, tree, int, int));
 169 extern tree build_enumerator                    PARAMS ((tree, tree));
 170 extern int  c_decode_option                     PARAMS ((int, char **));
 171 extern void c_mark_varargs                      PARAMS ((void));
 172 extern void check_for_loop_decls                PARAMS ((void));
 173 extern void clear_parm_order                    PARAMS ((void));
 174 extern int  complete_array_type                 PARAMS ((tree, tree, int));
 175 extern void declare_parm_level                  PARAMS ((int));
 176 extern tree define_label                        PARAMS ((const char *, int,
 177                                                          tree));
 178 extern void finish_decl                         PARAMS ((tree, tree, tree));
 179 extern tree finish_enum                         PARAMS ((tree, tree, tree));
 180 extern void finish_function                     PARAMS ((int));
 181 extern tree finish_struct                       PARAMS ((tree, tree, tree));
 182 extern tree get_parm_info                       PARAMS ((int));
 183 extern tree grokfield                           PARAMS ((const char *, int, tree, tree, tree));
 184 extern tree groktypename                        PARAMS ((tree));
 185 extern tree groktypename_in_parm_context        PARAMS ((tree));
 186 extern tree implicitly_declare                  PARAMS ((tree));
 187 extern void implicit_decl_warning               PARAMS ((tree));
 188 extern int  in_parm_level_p                     PARAMS ((void));
 189 extern void keep_next_level                     PARAMS ((void));
 190 extern int  kept_level_p                        PARAMS ((void));
 191 extern tree lookup_name                         PARAMS ((tree));
 192 extern tree lookup_name_current_level           PARAMS ((tree));
 193 extern void parmlist_tags_warning               PARAMS ((void));
 194 extern void pending_xref_error                  PARAMS ((void));
 195 extern void mark_c_function_context             PARAMS ((struct function *));
 196 extern void push_c_function_context             PARAMS ((struct function *));
 197 extern void pop_c_function_context              PARAMS ((struct function *));
 198 extern void pop_label_level                     PARAMS ((void));
 199 extern void push_label_level                    PARAMS ((void));
 200 extern void push_parm_decl                      PARAMS ((tree));
 201 extern tree pushdecl_top_level                  PARAMS ((tree));
 202 extern void pushtag                             PARAMS ((tree, tree));
 203 extern tree set_array_declarator_type           PARAMS ((tree, tree, int));
 204 extern tree shadow_label                        PARAMS ((tree));
 205 extern void shadow_tag                          PARAMS ((tree));
 206 extern void shadow_tag_warned                   PARAMS ((tree, int));
 207 extern tree start_enum                          PARAMS ((tree));
 208 extern int  start_function                      PARAMS ((tree, tree, tree));
 209 extern tree start_decl                          PARAMS ((tree, tree, int,
 210                                                          tree));
 211 extern tree start_struct                        PARAMS ((enum tree_code, tree));
 212 extern void store_parm_decls                    PARAMS ((void));
 213 extern tree xref_tag                            PARAMS ((enum tree_code, tree));
 214 extern tree c_begin_compound_stmt               PARAMS ((void));
 215 extern void c_expand_deferred_function          PARAMS ((tree));
 216 extern void c_expand_decl_stmt                  PARAMS ((tree));
 217
 218
 219 /* in c-objc-common.c */
 220 extern int c_disregard_inline_limits            PARAMS ((tree));
 221 extern int c_cannot_inline_tree_fn              PARAMS ((tree *));
 222 extern const char *c_objc_common_init           PARAMS ((const char *));
 223 extern int c_missing_noreturn_ok_p              PARAMS ((tree));
 224 extern void c_objc_common_finish_file           PARAMS ((void));
 225 extern int defer_fn                             PARAMS ((tree));
 226
 227 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P)           \
 228   c_build_qualified_type ((TYPE),                                 \
 229                           ((CONST_P) ? TYPE_QUAL_CONST : 0) |     \
 230                           ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
 231
 232 /* in c-typeck.c */
 233 extern tree require_complete_type               PARAMS ((tree));
 234 extern int comptypes                            PARAMS ((tree, tree));
 235 extern tree c_sizeof_nowarn                     PARAMS ((tree));
 236 extern tree c_size_in_bytes                     PARAMS ((tree));
 237 extern tree build_component_ref                 PARAMS ((tree, tree));
 238 extern tree build_indirect_ref                  PARAMS ((tree, const char *));
 239 extern tree build_array_ref                     PARAMS ((tree, tree));
 240 extern tree build_external_ref                  PARAMS ((tree, int));
 241 extern tree parser_build_binary_op              PARAMS ((enum tree_code,
 242                                                          tree, tree));
 243 extern void readonly_warning                    PARAMS ((tree, const char *));
 244 extern tree build_conditional_expr              PARAMS ((tree, tree, tree));
 245 extern tree build_compound_expr                 PARAMS ((tree));
 246 extern tree c_cast_expr                         PARAMS ((tree, tree));
 247 extern tree build_c_cast                        PARAMS ((tree, tree));
 248 extern tree build_modify_expr                   PARAMS ((tree, enum tree_code,
 249                                                          tree));
 250 extern void store_init_value                    PARAMS ((tree, tree));
 251 extern void error_init                          PARAMS ((const char *));
 252 extern void pedwarn_init                        PARAMS ((const char *));
 253 extern void start_init                          PARAMS ((tree, tree, int));
 254 extern void finish_init                         PARAMS ((void));
 255 extern void really_start_incremental_init       PARAMS ((tree));
 256 extern void push_init_level                     PARAMS ((int));
 257 extern tree pop_init_level                      PARAMS ((int));
 258 extern void set_init_index                      PARAMS ((tree, tree));
 259 extern void set_init_label                      PARAMS ((tree));
 260 extern void process_init_element                PARAMS ((tree));
 261 extern tree build_compound_literal              PARAMS ((tree, tree));
 262 extern void pedwarn_c99                         PARAMS ((const char *, ...))
 263                                                         ATTRIBUTE_PRINTF_1;
 264 extern tree c_start_case                        PARAMS ((tree));
 265 extern void c_finish_case                       PARAMS ((void));
 266 extern tree simple_asm_stmt                     PARAMS ((tree));
 267 extern tree build_asm_stmt                      PARAMS ((tree, tree, tree,
 268                                                          tree, tree));
 269
 270 /* Set to 0 at beginning of a function definition, set to 1 if
 271    a return statement that specifies a return value is seen.  */
 272
 273 extern int current_function_returns_value;
 274
 275 /* Set to 0 at beginning of a function definition, set to 1 if
 276    a return statement with no argument is seen.  */
 277
 278 extern int current_function_returns_null;
 279
 280 /* Nonzero means the expression being parsed will never be evaluated.
 281    This is a count, since unevaluated expressions can nest.  */
 282
 283 extern int skip_evaluation;
 284
 285 /* Nonzero means `$' can be in an identifier.  */
 286
 287 extern int dollars_in_ident;
 288
 289 /* Nonzero means allow type mismatches in conditional expressions;
 290    just make their values `void'.  */
 291
 292 extern int flag_cond_mismatch;
 293
 294 /* Nonzero means don't recognize the keyword `asm'.  */
 295
 296 extern int flag_no_asm;
 297
 298 /* Nonzero means warn about implicit declarations.  */
 299
 300 extern int warn_implicit;
 301
 302 /* Nonzero means warn for all old-style non-prototype function decls.  */
 303
 304 extern int warn_strict_prototypes;
 305
 306 /* Nonzero means warn about multiple (redundant) decls for the same single
 307    variable or function.  */
 308
 309 extern int warn_redundant_decls;
 310
 311 /* Nonzero means warn about extern declarations of objects not at
 312    file-scope level and about *all* declarations of functions (whether
 313    extern or static) not at file-scope level.  Note that we exclude
 314    implicit function declarations.  To get warnings about those, use
 315    -Wimplicit.  */
 316
 317 extern int warn_nested_externs;
 318
 319 /* Nonzero means warn about pointer casts that can drop a type qualifier
 320    from the pointer target type.  */
 321
 322 extern int warn_cast_qual;
 323
 324 /* Nonzero means warn when casting a function call to a type that does
 325    not match the return type (e.g. (float)sqrt() or (anything*)malloc()
 326    when there is no previous declaration of sqrt or malloc.  */
 327
 328 extern int warn_bad_function_cast;
 329
 330 /* Warn about traditional constructs whose meanings changed in ANSI C.  */
 331
 332 extern int warn_traditional;
 333
 334 /* Warn about a subscript that has type char.  */
 335
 336 extern int warn_char_subscripts;
 337
 338 /* Warn if main is suspicious.  */
 339
 340 extern int warn_main;
 341
 342 /* Nonzero means to allow single precision math even if we're generally
 343    being traditional.  */
 344 extern int flag_allow_single_precision;
 345
 346 /* Warn if initializer is not completely bracketed.  */
 347
 348 extern int warn_missing_braces;
 349
 350 /* Warn about comparison of signed and unsigned values.  */
 351
 352 extern int warn_sign_compare;
 353
 354 /* Warn about testing equality of floating point numbers.  */
 355
 356 extern int warn_float_equal;
 357
 358 /* Warn about multicharacter constants.  */
 359
 360 extern int warn_multichar;
 361
 362 /* Nonzero means we are reading code that came from a system header file.  */
 363
 364 extern int system_header_p;
 365
 366 /* Warn about implicit declarations.  1 = warning, 2 = error.  */
 367 extern int mesg_implicit_function_declaration;
 368
 369 /* In c-decl.c */
 370 extern void finish_incomplete_decl PARAMS ((tree));
 371
 372 extern tree static_ctors;
 373 extern tree static_dtors;
 374
 375 #endif /* ! GCC_C_TREE_H */