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 /* For a FUNCTION_DECL, nonzero if it was defined without an explicit
 136    return type.  */
 137 #define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP)
 138
 139 /* Nonzero for a declaration of a built in function if there has been no
 140    occasion that would declare the function in ordinary C.
 141    Using the function draws a pedantic warning in this case.  */
 142 #define C_DECL_ANTICIPATED(EXP) DECL_LANG_FLAG_3 (EXP)
 143
 144 /* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
 145    TYPE_ARG_TYPES for functions with prototypes, but created for functions
 146    without prototypes.  */
 147 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_BINFO (NODE)
 148
 149 \f
 150 /* in c-lang.c and objc-act.c */
 151 extern tree lookup_interface                    PARAMS ((tree));
 152 extern tree is_class_name                       PARAMS ((tree));
 153 extern void maybe_objc_check_decl               PARAMS ((tree));
 154 extern void finish_file                         PARAMS ((void));
 155 extern int maybe_objc_comptypes                 PARAMS ((tree, tree, int));
 156 extern tree maybe_building_objc_message_expr    PARAMS ((void));
 157 extern int recognize_objc_keyword               PARAMS ((void));
 158 extern tree lookup_objc_ivar                    PARAMS ((tree));
 159
 160 \f
 161 /* in c-parse.in */
 162 extern void c_parse_init                        PARAMS ((void));
 163 extern void c_set_yydebug                       PARAMS ((int));
 164 extern int yyparse_1                            PARAMS ((void));
 165
 166 /* in c-aux-info.c */
 167 extern void gen_aux_info_record                 PARAMS ((tree, int, int, int));
 168
 169 /* in c-decl.c */
 170 extern void c_init_decl_processing              PARAMS ((void));
 171 extern void c_dup_lang_specific_decl            PARAMS ((tree));
 172 extern void c_print_identifier                  PARAMS ((FILE *, tree, int));
 173 extern tree build_array_declarator              PARAMS ((tree, tree, int, int));
 174 extern tree build_enumerator                    PARAMS ((tree, tree));
 175 extern int  c_decode_option                     PARAMS ((int, char **));
 176 extern void c_mark_varargs                      PARAMS ((void));
 177 extern void check_for_loop_decls                PARAMS ((void));
 178 extern void clear_parm_order                    PARAMS ((void));
 179 extern int  complete_array_type                 PARAMS ((tree, tree, int));
 180 extern void declare_parm_level                  PARAMS ((int));
 181 extern tree define_label                        PARAMS ((const char *, int,
 182                                                          tree));
 183 extern void finish_decl                         PARAMS ((tree, tree, tree));
 184 extern tree finish_enum                         PARAMS ((tree, tree, tree));
 185 extern void finish_function                     PARAMS ((int));
 186 extern tree finish_struct                       PARAMS ((tree, tree, tree));
 187 extern tree get_parm_info                       PARAMS ((int));
 188 extern tree grokfield                           PARAMS ((const char *, int, tree, tree, tree));
 189 extern tree groktypename                        PARAMS ((tree));
 190 extern tree groktypename_in_parm_context        PARAMS ((tree));
 191 extern tree implicitly_declare                  PARAMS ((tree));
 192 extern void implicit_decl_warning               PARAMS ((tree));
 193 extern int  in_parm_level_p                     PARAMS ((void));
 194 extern void keep_next_level                     PARAMS ((void));
 195 extern int  kept_level_p                        PARAMS ((void));
 196 extern tree lookup_name                         PARAMS ((tree));
 197 extern tree lookup_name_current_level           PARAMS ((tree));
 198 extern void parmlist_tags_warning               PARAMS ((void));
 199 extern void pending_xref_error                  PARAMS ((void));
 200 extern void mark_c_function_context             PARAMS ((struct function *));
 201 extern void push_c_function_context             PARAMS ((struct function *));
 202 extern void pop_c_function_context              PARAMS ((struct function *));
 203 extern void pop_label_level                     PARAMS ((void));
 204 extern void push_label_level                    PARAMS ((void));
 205 extern void push_parm_decl                      PARAMS ((tree));
 206 extern tree pushdecl_top_level                  PARAMS ((tree));
 207 extern void pushtag                             PARAMS ((tree, tree));
 208 extern tree set_array_declarator_type           PARAMS ((tree, tree, int));
 209 extern tree shadow_label                        PARAMS ((tree));
 210 extern void shadow_tag                          PARAMS ((tree));
 211 extern void shadow_tag_warned                   PARAMS ((tree, int));
 212 extern tree start_enum                          PARAMS ((tree));
 213 extern int  start_function                      PARAMS ((tree, tree, tree));
 214 extern tree start_decl                          PARAMS ((tree, tree, int,
 215                                                          tree));
 216 extern tree start_struct                        PARAMS ((enum tree_code, tree));
 217 extern void store_parm_decls                    PARAMS ((void));
 218 extern tree xref_tag                            PARAMS ((enum tree_code, tree));
 219 extern tree c_begin_compound_stmt               PARAMS ((void));
 220 extern void c_expand_deferred_function          PARAMS ((tree));
 221 extern void c_expand_decl_stmt                  PARAMS ((tree));
 222
 223
 224 /* in c-objc-common.c */
 225 extern int c_disregard_inline_limits            PARAMS ((tree));
 226 extern int c_cannot_inline_tree_fn              PARAMS ((tree *));
 227 extern const char *c_objc_common_init           PARAMS ((const char *));
 228 extern int c_missing_noreturn_ok_p              PARAMS ((tree));
 229 extern void c_objc_common_finish_file           PARAMS ((void));
 230 extern int defer_fn                             PARAMS ((tree));
 231
 232 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P)           \
 233   c_build_qualified_type ((TYPE),                                 \
 234                           ((CONST_P) ? TYPE_QUAL_CONST : 0) |     \
 235                           ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
 236
 237 /* in c-typeck.c */
 238 extern tree require_complete_type               PARAMS ((tree));
 239 extern int comptypes                            PARAMS ((tree, tree));
 240 extern tree c_sizeof_nowarn                     PARAMS ((tree));
 241 extern tree c_size_in_bytes                     PARAMS ((tree));
 242 extern tree build_component_ref                 PARAMS ((tree, tree));
 243 extern tree build_indirect_ref                  PARAMS ((tree, const char *));
 244 extern tree build_array_ref                     PARAMS ((tree, tree));
 245 extern tree build_external_ref                  PARAMS ((tree, int));
 246 extern tree parser_build_binary_op              PARAMS ((enum tree_code,
 247                                                          tree, tree));
 248 extern void readonly_warning                    PARAMS ((tree, const char *));
 249 extern tree build_conditional_expr              PARAMS ((tree, tree, tree));
 250 extern tree build_compound_expr                 PARAMS ((tree));
 251 extern tree c_cast_expr                         PARAMS ((tree, tree));
 252 extern tree build_c_cast                        PARAMS ((tree, tree));
 253 extern tree build_modify_expr                   PARAMS ((tree, enum tree_code,
 254                                                          tree));
 255 extern void store_init_value                    PARAMS ((tree, tree));
 256 extern void error_init                          PARAMS ((const char *));
 257 extern void pedwarn_init                        PARAMS ((const char *));
 258 extern void start_init                          PARAMS ((tree, tree, int));
 259 extern void finish_init                         PARAMS ((void));
 260 extern void really_start_incremental_init       PARAMS ((tree));
 261 extern void push_init_level                     PARAMS ((int));
 262 extern tree pop_init_level                      PARAMS ((int));
 263 extern void set_init_index                      PARAMS ((tree, tree));
 264 extern void set_init_label                      PARAMS ((tree));
 265 extern void process_init_element                PARAMS ((tree));
 266 extern tree build_compound_literal              PARAMS ((tree, tree));
 267 extern void pedwarn_c99                         PARAMS ((const char *, ...))
 268                                                         ATTRIBUTE_PRINTF_1;
 269 extern tree c_start_case                        PARAMS ((tree));
 270 extern void c_finish_case                       PARAMS ((void));
 271 extern tree simple_asm_stmt                     PARAMS ((tree));
 272 extern tree build_asm_stmt                      PARAMS ((tree, tree, tree,
 273                                                          tree, tree));
 274
 275 /* Set to 0 at beginning of a function definition, set to 1 if
 276    a return statement that specifies a return value is seen.  */
 277
 278 extern int current_function_returns_value;
 279
 280 /* Set to 0 at beginning of a function definition, set to 1 if
 281    a return statement with no argument is seen.  */
 282
 283 extern int current_function_returns_null;
 284
 285 /* Set to 0 at beginning of a function definition, set to 1 if
 286    a call to a noreturn function is seen.  */
 287
 288 extern int current_function_returns_abnormally;
 289
 290 /* Nonzero means the expression being parsed will never be evaluated.
 291    This is a count, since unevaluated expressions can nest.  */
 292
 293 extern int skip_evaluation;
 294
 295 /* Nonzero means `$' can be in an identifier.  */
 296
 297 extern int dollars_in_ident;
 298
 299 /* Nonzero means allow type mismatches in conditional expressions;
 300    just make their values `void'.  */
 301
 302 extern int flag_cond_mismatch;
 303
 304 /* Nonzero means don't recognize the keyword `asm'.  */
 305
 306 extern int flag_no_asm;
 307
 308 /* Nonzero means warn about implicit declarations.  */
 309
 310 extern int warn_implicit;
 311
 312 /* Nonzero means warn for all old-style non-prototype function decls.  */
 313
 314 extern int warn_strict_prototypes;
 315
 316 /* Nonzero means warn about multiple (redundant) decls for the same single
 317    variable or function.  */
 318
 319 extern int warn_redundant_decls;
 320
 321 /* Nonzero means warn about extern declarations of objects not at
 322    file-scope level and about *all* declarations of functions (whether
 323    extern or static) not at file-scope level.  Note that we exclude
 324    implicit function declarations.  To get warnings about those, use
 325    -Wimplicit.  */
 326
 327 extern int warn_nested_externs;
 328
 329 /* Nonzero means warn about pointer casts that can drop a type qualifier
 330    from the pointer target type.  */
 331
 332 extern int warn_cast_qual;
 333
 334 /* Nonzero means warn when casting a function call to a type that does
 335    not match the return type (e.g. (float)sqrt() or (anything*)malloc()
 336    when there is no previous declaration of sqrt or malloc.  */
 337
 338 extern int warn_bad_function_cast;
 339
 340 /* Warn about traditional constructs whose meanings changed in ANSI C.  */
 341
 342 extern int warn_traditional;
 343
 344 /* Warn about a subscript that has type char.  */
 345
 346 extern int warn_char_subscripts;
 347
 348 /* Warn if main is suspicious.  */
 349
 350 extern int warn_main;
 351
 352 /* Warn if initializer is not completely bracketed.  */
 353
 354 extern int warn_missing_braces;
 355
 356 /* Warn about comparison of signed and unsigned values.  */
 357
 358 extern int warn_sign_compare;
 359
 360 /* Warn about testing equality of floating point numbers.  */
 361
 362 extern int warn_float_equal;
 363
 364 /* Warn about multicharacter constants.  */
 365
 366 extern int warn_multichar;
 367
 368 /* Nonzero means we are reading code that came from a system header file.  */
 369
 370 extern int system_header_p;
 371
 372 /* Warn about implicit declarations.  1 = warning, 2 = error.  */
 373 extern int mesg_implicit_function_declaration;
 374
 375 /* In c-decl.c */
 376 extern void finish_incomplete_decl PARAMS ((tree));
 377
 378 extern tree static_ctors;
 379 extern tree static_dtors;
 380
 381 #endif /* ! GCC_C_TREE_H */