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 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 \f
 156 /* in c-parse.in */
 157 extern void c_parse_init                        PARAMS ((void));
 158 extern int yyparse_1                            PARAMS ((void));
 159
 160 /* in c-aux-info.c */
 161 extern void gen_aux_info_record                 PARAMS ((tree, int, int, int));
 162
 163 /* in c-decl.c */
 164 extern tree build_array_declarator              PARAMS ((tree, tree, int, int));
 165 extern tree build_enumerator                    PARAMS ((tree, tree));
 166
 167 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P)           \
 168   c_build_qualified_type (TYPE,                           \
 169                           ((CONST_P) ? TYPE_QUAL_CONST : 0) |     \
 170                           ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
 171 extern int  c_decode_option                     PARAMS ((int, char **));
 172 extern void c_mark_varargs                      PARAMS ((void));
 173 extern void check_for_loop_decls                PARAMS ((void));
 174 extern tree check_identifier                    PARAMS ((tree, tree));
 175 extern void clear_parm_order                    PARAMS ((void));
 176 extern int  complete_array_type                 PARAMS ((tree, tree, int));
 177 extern void declare_parm_level                  PARAMS ((int));
 178 extern tree define_label                        PARAMS ((const char *, int,
 179                                                          tree));
 180 extern void delete_block                        PARAMS ((tree));
 181 extern void finish_decl                         PARAMS ((tree, tree, tree));
 182 extern void finish_decl_top_level               PARAMS ((tree, tree, tree));
 183 extern tree finish_enum                         PARAMS ((tree, tree, tree));
 184 extern void finish_function                     PARAMS ((int));
 185 extern tree finish_struct                       PARAMS ((tree, tree, tree));
 186 extern tree get_parm_info                       PARAMS ((int));
 187 extern tree grokfield                           PARAMS ((const char *, int, tree, tree, tree));
 188 extern tree groktypename                        PARAMS ((tree));
 189 extern tree groktypename_in_parm_context        PARAMS ((tree));
 190 extern tree implicitly_declare                  PARAMS ((tree));
 191 extern void implicit_decl_warning               PARAMS ((tree));
 192 extern int  in_parm_level_p                     PARAMS ((void));
 193 extern void keep_next_level                     PARAMS ((void));
 194 extern int  kept_level_p                        PARAMS ((void));
 195 extern tree lookup_name                         PARAMS ((tree));
 196 extern tree lookup_name_current_level           PARAMS ((tree));
 197 extern tree lookup_name_current_level_global    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_record_fields                PARAMS ((tree));
 211 extern void shadow_tag                          PARAMS ((tree));
 212 extern void shadow_tag_warned                   PARAMS ((tree, int));
 213 extern tree start_enum                          PARAMS ((tree));
 214 extern int  start_function                      PARAMS ((tree, tree, tree));
 215 extern tree start_decl                          PARAMS ((tree, tree, int,
 216                                                          tree));
 217 extern tree start_struct                        PARAMS ((enum tree_code, tree));
 218 extern void store_parm_decls                    PARAMS ((void));
 219 extern tree xref_tag                            PARAMS ((enum tree_code, tree));
 220 extern tree c_begin_compound_stmt               PARAMS ((void));
 221 extern void c_expand_decl_stmt                  PARAMS ((tree));
 222
 223 /* in c-typeck.c */
 224 extern tree require_complete_type               PARAMS ((tree));
 225 extern int comptypes                            PARAMS ((tree, tree));
 226 extern tree c_sizeof_nowarn                     PARAMS ((tree));
 227 extern tree c_size_in_bytes                     PARAMS ((tree));
 228 extern tree build_component_ref                 PARAMS ((tree, tree));
 229 extern tree build_indirect_ref                  PARAMS ((tree, const char *));
 230 extern tree build_array_ref                     PARAMS ((tree, tree));
 231 extern tree build_external_ref                  PARAMS ((tree, int));
 232 extern tree parser_build_binary_op              PARAMS ((enum tree_code,
 233                                                          tree, tree));
 234 extern void readonly_warning                    PARAMS ((tree, const char *));
 235 extern tree build_conditional_expr              PARAMS ((tree, tree, tree));
 236 extern tree build_compound_expr                 PARAMS ((tree));
 237 extern tree c_cast_expr                         PARAMS ((tree, tree));
 238 extern tree build_c_cast                        PARAMS ((tree, tree));
 239 extern tree build_modify_expr                   PARAMS ((tree, enum tree_code,
 240                                                          tree));
 241 extern void store_init_value                    PARAMS ((tree, tree));
 242 extern void error_init                          PARAMS ((const char *));
 243 extern void pedwarn_init                        PARAMS ((const char *));
 244 extern void start_init                          PARAMS ((tree, tree, int));
 245 extern void finish_init                         PARAMS ((void));
 246 extern void really_start_incremental_init       PARAMS ((tree));
 247 extern void push_init_level                     PARAMS ((int));
 248 extern tree pop_init_level                      PARAMS ((int));
 249 extern void set_init_index                      PARAMS ((tree, tree));
 250 extern void set_init_label                      PARAMS ((tree));
 251 extern void process_init_element                PARAMS ((tree));
 252 extern void pedwarn_c99                         PARAMS ((const char *, ...))
 253                                                         ATTRIBUTE_PRINTF_1;
 254 extern tree c_start_case                        PARAMS ((tree));
 255 extern void c_finish_case                       PARAMS ((void));
 256 extern tree simple_asm_stmt                     PARAMS ((tree));
 257 extern tree build_asm_stmt                      PARAMS ((tree, tree, tree,
 258                                                          tree, tree));
 259
 260 /* Set to 0 at beginning of a function definition, set to 1 if
 261    a return statement that specifies a return value is seen.  */
 262
 263 extern int current_function_returns_value;
 264
 265 /* Set to 0 at beginning of a function definition, set to 1 if
 266    a return statement with no argument is seen.  */
 267
 268 extern int current_function_returns_null;
 269
 270 /* Nonzero means the expression being parsed will never be evaluated.
 271    This is a count, since unevaluated expressions can nest.  */
 272
 273 extern int skip_evaluation;
 274
 275 /* Nonzero means `$' can be in an identifier.  */
 276
 277 extern int dollars_in_ident;
 278
 279 /* Nonzero means allow type mismatches in conditional expressions;
 280    just make their values `void'.  */
 281
 282 extern int flag_cond_mismatch;
 283
 284 /* Nonzero means don't recognize the keyword `asm'.  */
 285
 286 extern int flag_no_asm;
 287
 288 /* Nonzero means warn about implicit declarations.  */
 289
 290 extern int warn_implicit;
 291
 292 /* Nonzero means warn for all old-style non-prototype function decls.  */
 293
 294 extern int warn_strict_prototypes;
 295
 296 /* Nonzero means warn about multiple (redundant) decls for the same single
 297    variable or function.  */
 298
 299 extern int warn_redundant_decls;
 300
 301 /* Nonzero means warn about extern declarations of objects not at
 302    file-scope level and about *all* declarations of functions (whether
 303    extern or static) not at file-scope level.  Note that we exclude
 304    implicit function declarations.  To get warnings about those, use
 305    -Wimplicit.  */
 306
 307 extern int warn_nested_externs;
 308
 309 /* Nonzero means warn about pointer casts that can drop a type qualifier
 310    from the pointer target type.  */
 311
 312 extern int warn_cast_qual;
 313
 314 /* Nonzero means warn when casting a function call to a type that does
 315    not match the return type (e.g. (float)sqrt() or (anything*)malloc()
 316    when there is no previous declaration of sqrt or malloc.  */
 317
 318 extern int warn_bad_function_cast;
 319
 320 /* Warn about traditional constructs whose meanings changed in ANSI C.  */
 321
 322 extern int warn_traditional;
 323
 324 /* Warn about a subscript that has type char.  */
 325
 326 extern int warn_char_subscripts;
 327
 328 /* Warn if main is suspicious.  */
 329
 330 extern int warn_main;
 331
 332 /* Nonzero means to allow single precision math even if we're generally
 333    being traditional.  */
 334 extern int flag_allow_single_precision;
 335
 336 /* Warn if initializer is not completely bracketed.  */
 337
 338 extern int warn_missing_braces;
 339
 340 /* Warn about comparison of signed and unsigned values.  */
 341
 342 extern int warn_sign_compare;
 343
 344 /* Warn about testing equality of floating point numbers.  */
 345
 346 extern int warn_float_equal;
 347
 348 /* Warn about multicharacter constants.  */
 349
 350 extern int warn_multichar;
 351
 352 /* Nonzero means we are reading code that came from a system header file.  */
 353
 354 extern int system_header_p;
 355
 356 /* Warn about implicit declarations.  1 = warning, 2 = error.  */
 357 extern int mesg_implicit_function_declaration;
 358
 359 /* In c-decl.c */
 360 extern void finish_incomplete_decl PARAMS ((tree));
 361
 362 #endif /* ! GCC_C_TREE_H */