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 GTY(())
  38 {
  39   struct c_common_identifier common_id;
  40   tree global_value;
  41   tree local_value;
  42   tree label_value;
  43   tree implicit_decl;
  44   tree error_locus;
  45   tree limbo_value;
  46 };
  47
  48 /* The resulting tree type.  */
  49
  50 union lang_tree_node
  51   GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE")))
  52 {
  53   union tree_node GTY ((tag ("0"),
  54                         desc ("tree_node_structure (&%h)")))
  55     generic;
  56   struct lang_identifier GTY ((tag ("1"))) identifier;
  57 };
  58
  59 /* Language-specific declaration information.  */
  60
  61 struct lang_decl GTY(())
  62 {
  63   struct c_lang_decl base;
  64   /* The return types and parameter types may have variable size.
  65      This is a list of any SAVE_EXPRs that need to be evaluated to
  66      compute those sizes.  */
  67   tree pending_sizes;
  68 };
  69
  70 /* Macros for access to language-specific slots in an identifier.  */
  71 /* Each of these slots contains a DECL node or null.  */
  72
  73 /* This represents the value which the identifier has in the
  74    file-scope namespace.  */
  75 #define IDENTIFIER_GLOBAL_VALUE(NODE)   \
  76   (((struct lang_identifier *) (NODE))->global_value)
  77 /* This represents the value which the identifier has in the current
  78    scope.  */
  79 #define IDENTIFIER_LOCAL_VALUE(NODE)    \
  80   (((struct lang_identifier *) (NODE))->local_value)
  81 /* This represents the value which the identifier has as a label in
  82    the current label scope.  */
  83 #define IDENTIFIER_LABEL_VALUE(NODE)    \
  84   (((struct lang_identifier *) (NODE))->label_value)
  85 /* This records the extern decl of this identifier, if it has had one
  86    at any point in this compilation.  */
  87 #define IDENTIFIER_LIMBO_VALUE(NODE)    \
  88   (((struct lang_identifier *) (NODE))->limbo_value)
  89 /* This records the implicit function decl of this identifier, if it
  90    has had one at any point in this compilation.  */
  91 #define IDENTIFIER_IMPLICIT_DECL(NODE)  \
  92   (((struct lang_identifier *) (NODE))->implicit_decl)
  93 /* This is the last function in which we printed an "undefined variable"
  94    message for this identifier.  Value is a FUNCTION_DECL or null.  */
  95 #define IDENTIFIER_ERROR_LOCUS(NODE)    \
  96   (((struct lang_identifier *) (NODE))->error_locus)
  97
  98 /* In identifiers, C uses the following fields in a special way:
  99    TREE_PUBLIC        to record that there was a previous local extern decl.
 100    TREE_USED          to record that such a decl was used.
 101    TREE_ADDRESSABLE   to record that the address of such a decl was used.  */
 102
 103 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only.  */
 104 #define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1 (TYPE)
 105
 106 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile.  */
 107 #define C_TYPE_FIELDS_VOLATILE(TYPE) TREE_LANG_FLAG_2 (TYPE)
 108
 109 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
 110    nonzero if the definition of the type has already started.  */
 111 #define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE)
 112
 113 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
 114    keyword.  C_RID_CODE (node) is then the RID_* value of the keyword,
 115    and C_RID_YYCODE is the token number wanted by Yacc.  */
 116 #define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
 117
 118 /* This function was declared inline.  This flag controls the linkage
 119    semantics of 'inline'; whether or not the function is inlined is
 120    controlled by DECL_INLINE.  */
 121 #define DECL_DECLARED_INLINE_P(NODE) \
 122   (DECL_LANG_SPECIFIC (NODE)->base.declared_inline)
 123
 124 /* In a RECORD_TYPE, a sorted array of the fields of the type.  */
 125 struct lang_type GTY(())
 126 {
 127   int len;
 128   tree GTY((length ("%h.len"))) elts[1];
 129 };
 130
 131 /* Record whether a type or decl was written with nonconstant size.
 132    Note that TYPE_SIZE may have simplified to a constant.  */
 133 #define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
 134 #define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
 135
 136 #if 0 /* Not used.  */
 137 /* Record whether a decl for a function or function pointer has
 138    already been mentioned (in a warning) because it was called
 139    but didn't have a prototype.  */
 140 #define C_MISSING_PROTOTYPE_WARNED(DECL) DECL_LANG_FLAG_2 (DECL)
 141 #endif
 142
 143 /* Store a value in that field.  */
 144 #define C_SET_EXP_ORIGINAL_CODE(EXP, CODE) \
 145   (TREE_COMPLEXITY (EXP) = (int) (CODE))
 146
 147 /* Record whether a typedef for type `int' was actually `signed int'.  */
 148 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
 149
 150 /* For a FUNCTION_DECL, nonzero if it was defined without an explicit
 151    return type.  */
 152 #define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP)
 153
 154 /* Nonzero for a declaration of a built in function if there has been no
 155    occasion that would declare the function in ordinary C.
 156    Using the function draws a pedantic warning in this case.  */
 157 #define C_DECL_ANTICIPATED(EXP) DECL_LANG_FLAG_3 (EXP)
 158
 159 /* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
 160    TYPE_ARG_TYPES for functions with prototypes, but created for functions
 161    without prototypes.  */
 162 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_BINFO (NODE)
 163
 164 \f
 165 /* in c-lang.c and objc-act.c */
 166 extern tree lookup_interface                    PARAMS ((tree));
 167 extern tree is_class_name                       PARAMS ((tree));
 168 extern void maybe_objc_check_decl               PARAMS ((tree));
 169 extern void finish_file                         PARAMS ((void));
 170 extern int maybe_objc_comptypes                 PARAMS ((tree, tree, int));
 171 extern tree maybe_building_objc_message_expr    PARAMS ((void));
 172 extern int recognize_objc_keyword               PARAMS ((void));
 173 extern tree lookup_objc_ivar                    PARAMS ((tree));
 174
 175 \f
 176 /* in c-parse.in */
 177 extern void c_parse_init                        PARAMS ((void));
 178
 179 /* in c-aux-info.c */
 180 extern void gen_aux_info_record                 PARAMS ((tree, int, int, int));
 181
 182 /* in c-decl.c */
 183 extern int global_bindings_p                    PARAMS ((void));
 184 extern int kept_level_p                         PARAMS ((void));
 185 extern tree getdecls                            PARAMS ((void));
 186 extern void pushlevel                           PARAMS ((int));
 187 extern tree poplevel                            PARAMS ((int,int, int));
 188 extern void insert_block                        PARAMS ((tree));
 189 extern void set_block                           PARAMS ((tree));
 190 extern tree pushdecl                            PARAMS ((tree));
 191
 192 extern void c_insert_default_attributes         PARAMS ((tree));
 193 extern void c_init_decl_processing              PARAMS ((void));
 194 extern void c_dup_lang_specific_decl            PARAMS ((tree));
 195 extern void c_print_identifier                  PARAMS ((FILE *, tree, int));
 196 extern tree build_array_declarator              PARAMS ((tree, tree, int, int));
 197 extern tree build_enumerator                    PARAMS ((tree, tree));
 198 extern int  c_decode_option                     PARAMS ((int, char **));
 199 extern void c_mark_varargs                      PARAMS ((void));
 200 extern void check_for_loop_decls                PARAMS ((void));
 201 extern void clear_parm_order                    PARAMS ((void));
 202 extern int  complete_array_type                 PARAMS ((tree, tree, int));
 203 extern void declare_parm_level                  PARAMS ((int));
 204 extern tree define_label                        PARAMS ((const char *, int,
 205                                                          tree));
 206 extern void finish_decl                         PARAMS ((tree, tree, tree));
 207 extern tree finish_enum                         PARAMS ((tree, tree, tree));
 208 extern void finish_function                     PARAMS ((int, int));
 209 extern tree finish_struct                       PARAMS ((tree, tree, tree));
 210 extern tree get_parm_info                       PARAMS ((int));
 211 extern tree grokfield                           PARAMS ((const char *, int, tree, tree, tree));
 212 extern tree groktypename                        PARAMS ((tree));
 213 extern tree groktypename_in_parm_context        PARAMS ((tree));
 214 extern tree implicitly_declare                  PARAMS ((tree));
 215 extern void implicit_decl_warning               PARAMS ((tree));
 216 extern int  in_parm_level_p                     PARAMS ((void));
 217 extern void keep_next_level                     PARAMS ((void));
 218 extern tree lookup_name                         PARAMS ((tree));
 219 extern tree lookup_name_current_level           PARAMS ((tree));
 220 extern void parmlist_tags_warning               PARAMS ((void));
 221 extern void pending_xref_error                  PARAMS ((void));
 222 extern void c_push_function_context             PARAMS ((struct function *));
 223 extern void c_pop_function_context              PARAMS ((struct function *));
 224 extern void pop_label_level                     PARAMS ((void));
 225 extern void push_label_level                    PARAMS ((void));
 226 extern void push_parm_decl                      PARAMS ((tree));
 227 extern tree pushdecl_top_level                  PARAMS ((tree));
 228 extern void pushtag                             PARAMS ((tree, tree));
 229 extern tree set_array_declarator_type           PARAMS ((tree, tree, int));
 230 extern tree shadow_label                        PARAMS ((tree));
 231 extern void shadow_tag                          PARAMS ((tree));
 232 extern void shadow_tag_warned                   PARAMS ((tree, int));
 233 extern tree start_enum                          PARAMS ((tree));
 234 extern int  start_function                      PARAMS ((tree, tree, tree));
 235 extern tree start_decl                          PARAMS ((tree, tree, int,
 236                                                          tree));
 237 extern tree start_struct                        PARAMS ((enum tree_code, tree));
 238 extern void store_parm_decls                    PARAMS ((void));
 239 extern tree xref_tag                            PARAMS ((enum tree_code, tree));
 240 extern tree c_begin_compound_stmt               PARAMS ((void));
 241 extern void c_expand_deferred_function          PARAMS ((tree));
 242 extern void c_expand_decl_stmt                  PARAMS ((tree));
 243 extern tree make_pointer_declarator             PARAMS ((tree, tree));
 244
 245 /* in c-objc-common.c */
 246 extern int c_disregard_inline_limits            PARAMS ((tree));
 247 extern int c_cannot_inline_tree_fn              PARAMS ((tree *));
 248 extern const char *c_objc_common_init           PARAMS ((const char *));
 249 extern int c_missing_noreturn_ok_p              PARAMS ((tree));
 250 extern void c_objc_common_finish_file           PARAMS ((void));
 251 extern int defer_fn                             PARAMS ((tree));
 252 extern bool c_warn_unused_global_decl           PARAMS ((tree));
 253
 254 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P)           \
 255   c_build_qualified_type ((TYPE),                                 \
 256                           ((CONST_P) ? TYPE_QUAL_CONST : 0) |     \
 257                           ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
 258
 259 /* in c-typeck.c */
 260 extern tree require_complete_type               PARAMS ((tree));
 261 extern int comptypes                            PARAMS ((tree, tree));
 262 extern tree c_sizeof_nowarn                     PARAMS ((tree));
 263 extern tree c_size_in_bytes                     PARAMS ((tree));
 264 extern bool c_mark_addressable                  PARAMS ((tree));
 265 extern void c_incomplete_type_error             PARAMS ((tree, tree));
 266 extern tree c_type_promotes_to                  PARAMS ((tree));
 267 extern tree build_component_ref                 PARAMS ((tree, tree));
 268 extern tree build_indirect_ref                  PARAMS ((tree, const char *));
 269 extern tree build_array_ref                     PARAMS ((tree, tree));
 270 extern tree build_external_ref                  PARAMS ((tree, int));
 271 extern tree parser_build_binary_op              PARAMS ((enum tree_code,
 272                                                          tree, tree));
 273 extern void readonly_warning                    PARAMS ((tree, const char *));
 274 extern tree build_conditional_expr              PARAMS ((tree, tree, tree));
 275 extern tree build_compound_expr                 PARAMS ((tree));
 276 extern tree c_cast_expr                         PARAMS ((tree, tree));
 277 extern tree build_c_cast                        PARAMS ((tree, tree));
 278 extern tree build_modify_expr                   PARAMS ((tree, enum tree_code,
 279                                                          tree));
 280 extern void store_init_value                    PARAMS ((tree, tree));
 281 extern void error_init                          PARAMS ((const char *));
 282 extern void pedwarn_init                        PARAMS ((const char *));
 283 extern void start_init                          PARAMS ((tree, tree, int));
 284 extern void finish_init                         PARAMS ((void));
 285 extern void really_start_incremental_init       PARAMS ((tree));
 286 extern void push_init_level                     PARAMS ((int));
 287 extern tree pop_init_level                      PARAMS ((int));
 288 extern void set_init_index                      PARAMS ((tree, tree));
 289 extern void set_init_label                      PARAMS ((tree));
 290 extern void process_init_element                PARAMS ((tree));
 291 extern tree build_compound_literal              PARAMS ((tree, tree));
 292 extern void pedwarn_c99                         PARAMS ((const char *, ...))
 293                                                         ATTRIBUTE_PRINTF_1;
 294 extern tree c_start_case                        PARAMS ((tree));
 295 extern void c_finish_case                       PARAMS ((void));
 296 extern tree simple_asm_stmt                     PARAMS ((tree));
 297 extern tree build_asm_stmt                      PARAMS ((tree, tree, tree,
 298                                                          tree, tree));
 299 extern tree c_convert_parm_for_inlining         PARAMS ((tree, tree, tree));
 300
 301 /* Set to 0 at beginning of a function definition, set to 1 if
 302    a return statement that specifies a return value is seen.  */
 303
 304 extern int current_function_returns_value;
 305
 306 /* Set to 0 at beginning of a function definition, set to 1 if
 307    a return statement with no argument is seen.  */
 308
 309 extern int current_function_returns_null;
 310
 311 /* Set to 0 at beginning of a function definition, set to 1 if
 312    a call to a noreturn function is seen.  */
 313
 314 extern int current_function_returns_abnormally;
 315
 316 /* Nonzero means the expression being parsed will never be evaluated.
 317    This is a count, since unevaluated expressions can nest.  */
 318
 319 extern int skip_evaluation;
 320
 321 /* Nonzero means `$' can be in an identifier.  */
 322
 323 extern int dollars_in_ident;
 324
 325 /* Nonzero means allow type mismatches in conditional expressions;
 326    just make their values `void'.  */
 327
 328 extern int flag_cond_mismatch;
 329
 330 /* Nonzero means don't recognize the keyword `asm'.  */
 331
 332 extern int flag_no_asm;
 333
 334 /* Nonzero means warn about implicit declarations.  */
 335
 336 extern int warn_implicit;
 337
 338 /* Nonzero means warn for all old-style non-prototype function decls.  */
 339
 340 extern int warn_strict_prototypes;
 341
 342 /* Nonzero means warn about multiple (redundant) decls for the same single
 343    variable or function.  */
 344
 345 extern int warn_redundant_decls;
 346
 347 /* Nonzero means warn about extern declarations of objects not at
 348    file-scope level and about *all* declarations of functions (whether
 349    extern or static) not at file-scope level.  Note that we exclude
 350    implicit function declarations.  To get warnings about those, use
 351    -Wimplicit.  */
 352
 353 extern int warn_nested_externs;
 354
 355 /* Nonzero means warn about pointer casts that can drop a type qualifier
 356    from the pointer target type.  */
 357
 358 extern int warn_cast_qual;
 359
 360 /* Nonzero means warn when casting a function call to a type that does
 361    not match the return type (e.g. (float)sqrt() or (anything*)malloc()
 362    when there is no previous declaration of sqrt or malloc.  */
 363
 364 extern int warn_bad_function_cast;
 365
 366 /* Warn about traditional constructs whose meanings changed in ANSI C.  */
 367
 368 extern int warn_traditional;
 369
 370 /* Warn about a subscript that has type char.  */
 371
 372 extern int warn_char_subscripts;
 373
 374 /* Warn if main is suspicious.  */
 375
 376 extern int warn_main;
 377
 378 /* Warn if initializer is not completely bracketed.  */
 379
 380 extern int warn_missing_braces;
 381
 382 /* Warn about comparison of signed and unsigned values.  */
 383
 384 extern int warn_sign_compare;
 385
 386 /* Warn about testing equality of floating point numbers.  */
 387
 388 extern int warn_float_equal;
 389
 390 /* Nonzero means we are reading code that came from a system header file.  */
 391
 392 extern int system_header_p;
 393
 394 /* Warn about implicit declarations.  1 = warning, 2 = error.  */
 395 extern int mesg_implicit_function_declaration;
 396
 397 /* In c-decl.c */
 398 extern void c_finish_incomplete_decl PARAMS ((tree));
 399
 400 extern GTY(()) tree static_ctors;
 401 extern GTY(()) tree static_dtors;
 402
 403 #endif /* ! GCC_C_TREE_H */