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
 102 #define C_IS_RESERVED_WORD(id) TREE_LANG_FLAG_0 (id)
 103
 104 /* In a RECORD_TYPE, a sorted array of the fields of the type.  */
 105 struct lang_type
 106 {
 107   int len;
 108   tree elts[1];
 109 };
 110
 111 /* Record whether a type or decl was written with nonconstant size.
 112    Note that TYPE_SIZE may have simplified to a constant.  */
 113 #define C_TYPE_VARIABLE_SIZE(type) TYPE_LANG_FLAG_1 (type)
 114 #define C_DECL_VARIABLE_SIZE(type) DECL_LANG_FLAG_0 (type)
 115
 116 #if 0 /* Not used.  */
 117 /* Record whether a decl for a function or function pointer has
 118    already been mentioned (in a warning) because it was called
 119    but didn't have a prototype.  */
 120 #define C_MISSING_PROTOTYPE_WARNED(decl) DECL_LANG_FLAG_2(decl)
 121 #endif
 122
 123 /* Store a value in that field.  */
 124 #define C_SET_EXP_ORIGINAL_CODE(exp, code) \
 125   (TREE_COMPLEXITY (exp) = (int) (code))
 126
 127 /* Record whether a typedef for type `int' was actually `signed int'.  */
 128 #define C_TYPEDEF_EXPLICITLY_SIGNED(exp) DECL_LANG_FLAG_1 ((exp))
 129
 130 /* Nonzero for a declaration of a built in function if there has been no
 131    occasion that would declare the function in ordinary C.
 132    Using the function draws a pedantic warning in this case.  */
 133 #define C_DECL_ANTICIPATED(exp) DECL_LANG_FLAG_3 ((exp))
 134
 135 /* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
 136    TYPE_ARG_TYPES for functions with prototypes, but created for functions
 137    without prototypes.  */
 138 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_NONCOPIED_PARTS (NODE)
 139
 140 \f
 141 /* in c-lang.c and objc-act.c */
 142 extern tree lookup_interface                    PARAMS ((tree));
 143 extern tree is_class_name                       PARAMS ((tree));
 144 extern void maybe_objc_check_decl               PARAMS ((tree));
 145 extern void finish_file                         PARAMS ((void));
 146 extern int maybe_objc_comptypes                 PARAMS ((tree, tree, int));
 147 extern tree maybe_building_objc_message_expr    PARAMS ((void));
 148 extern int recognize_objc_keyword               PARAMS ((void));
 149 extern tree lookup_objc_ivar                    PARAMS ((tree));
 150 \f
 151 /* in c-parse.in */
 152 extern void c_parse_init                        PARAMS ((void));
 153 extern int yyparse_1                            PARAMS ((void));
 154
 155 /* in c-aux-info.c */
 156 extern void gen_aux_info_record                 PARAMS ((tree, int, int, int));
 157
 158 /* in c-decl.c */
 159 extern tree build_array_declarator              PARAMS ((tree, tree, int, int));
 160 extern tree build_enumerator                    PARAMS ((tree, tree));
 161
 162 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P)           \
 163   c_build_qualified_type (TYPE,                           \
 164                           ((CONST_P) ? TYPE_QUAL_CONST : 0) |     \
 165                           ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
 166 extern int  c_decode_option                     PARAMS ((int, char **));
 167 extern void c_mark_varargs                      PARAMS ((void));
 168 extern void check_for_loop_decls                PARAMS ((void));
 169 extern tree check_identifier                    PARAMS ((tree, tree));
 170 extern void clear_parm_order                    PARAMS ((void));
 171 extern int  complete_array_type                 PARAMS ((tree, tree, int));
 172 extern void declare_parm_level                  PARAMS ((int));
 173 extern tree define_label                        PARAMS ((const char *, int,
 174                                                          tree));
 175 extern void delete_block                        PARAMS ((tree));
 176 extern void finish_decl                         PARAMS ((tree, tree, tree));
 177 extern void finish_decl_top_level               PARAMS ((tree, tree, tree));
 178 extern tree finish_enum                         PARAMS ((tree, tree, tree));
 179 extern void finish_function                     PARAMS ((int));
 180 extern tree finish_struct                       PARAMS ((tree, tree, tree));
 181 extern tree get_parm_info                       PARAMS ((int));
 182 extern tree grokfield                           PARAMS ((const char *, int, tree, tree, tree));
 183 extern tree groktypename                        PARAMS ((tree));
 184 extern tree groktypename_in_parm_context        PARAMS ((tree));
 185 extern tree implicitly_declare                  PARAMS ((tree));
 186 extern void implicit_decl_warning               PARAMS ((tree));
 187 extern int  in_parm_level_p                     PARAMS ((void));
 188 extern void keep_next_level                     PARAMS ((void));
 189 extern int  kept_level_p                        PARAMS ((void));
 190 extern tree lookup_name                         PARAMS ((tree));
 191 extern tree lookup_name_current_level           PARAMS ((tree));
 192 extern tree lookup_name_current_level_global    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_record_fields                PARAMS ((tree));
 206 extern void shadow_tag                          PARAMS ((tree));
 207 extern void shadow_tag_warned                   PARAMS ((tree, int));
 208 extern tree start_enum                          PARAMS ((tree));
 209 extern int  start_function                      PARAMS ((tree, tree, tree));
 210 extern tree start_decl                          PARAMS ((tree, tree, int,
 211                                                          tree));
 212 extern tree start_struct                        PARAMS ((enum tree_code, tree));
 213 extern void store_parm_decls                    PARAMS ((void));
 214 extern tree xref_tag                            PARAMS ((enum tree_code, tree));
 215 extern tree c_begin_compound_stmt               PARAMS ((void));
 216 extern void c_expand_decl_stmt                  PARAMS ((tree));
 217
 218 /* in c-typeck.c */
 219 extern tree require_complete_type               PARAMS ((tree));
 220 extern int comptypes                            PARAMS ((tree, tree));
 221 extern tree c_sizeof_nowarn                     PARAMS ((tree));
 222 extern tree c_size_in_bytes                     PARAMS ((tree));
 223 extern tree build_component_ref                 PARAMS ((tree, tree));
 224 extern tree build_indirect_ref                  PARAMS ((tree, const char *));
 225 extern tree build_array_ref                     PARAMS ((tree, tree));
 226 extern tree build_external_ref                  PARAMS ((tree, int));
 227 extern tree parser_build_binary_op              PARAMS ((enum tree_code,
 228                                                          tree, tree));
 229 extern void readonly_warning                    PARAMS ((tree, const char *));
 230 extern tree build_conditional_expr              PARAMS ((tree, tree, tree));
 231 extern tree build_compound_expr                 PARAMS ((tree));
 232 extern tree c_cast_expr                         PARAMS ((tree, tree));
 233 extern tree build_c_cast                        PARAMS ((tree, tree));
 234 extern tree build_modify_expr                   PARAMS ((tree, enum tree_code,
 235                                                          tree));
 236 extern void store_init_value                    PARAMS ((tree, tree));
 237 extern void error_init                          PARAMS ((const char *));
 238 extern void pedwarn_init                        PARAMS ((const char *));
 239 extern void start_init                          PARAMS ((tree, tree, int));
 240 extern void finish_init                         PARAMS ((void));
 241 extern void really_start_incremental_init       PARAMS ((tree));
 242 extern void push_init_level                     PARAMS ((int));
 243 extern tree pop_init_level                      PARAMS ((int));
 244 extern void set_init_index                      PARAMS ((tree, tree));
 245 extern void set_init_label                      PARAMS ((tree));
 246 extern void process_init_element                PARAMS ((tree));
 247 extern void pedwarn_c99                         PARAMS ((const char *, ...))
 248                                                         ATTRIBUTE_PRINTF_1;
 249 extern tree c_start_case                        PARAMS ((tree));
 250 extern void c_finish_case                       PARAMS ((void));
 251 extern tree simple_asm_stmt                     PARAMS ((tree));
 252 extern tree build_asm_stmt                      PARAMS ((tree, tree, tree,
 253                                                          tree, tree));
 254
 255 /* Set to 0 at beginning of a function definition, set to 1 if
 256    a return statement that specifies a return value is seen.  */
 257
 258 extern int current_function_returns_value;
 259
 260 /* Set to 0 at beginning of a function definition, set to 1 if
 261    a return statement with no argument is seen.  */
 262
 263 extern int current_function_returns_null;
 264
 265 /* Nonzero means the expression being parsed will never be evaluated.
 266    This is a count, since unevaluated expressions can nest.  */
 267
 268 extern int skip_evaluation;
 269
 270 /* Nonzero means `$' can be in an identifier.  */
 271
 272 extern int dollars_in_ident;
 273
 274 /* Nonzero means allow type mismatches in conditional expressions;
 275    just make their values `void'.   */
 276
 277 extern int flag_cond_mismatch;
 278
 279 /* Nonzero means don't recognize the keyword `asm'.  */
 280
 281 extern int flag_no_asm;
 282
 283 /* Nonzero means warn about implicit declarations.  */
 284
 285 extern int warn_implicit;
 286
 287 /* Nonzero means warn for all old-style non-prototype function decls.  */
 288
 289 extern int warn_strict_prototypes;
 290
 291 /* Nonzero means warn about multiple (redundant) decls for the same single
 292    variable or function.  */
 293
 294 extern int warn_redundant_decls;
 295
 296 /* Nonzero means warn about extern declarations of objects not at
 297    file-scope level and about *all* declarations of functions (whether
 298    extern or static) not at file-scope level.  Note that we exclude
 299    implicit function declarations.  To get warnings about those, use
 300    -Wimplicit.  */
 301
 302 extern int warn_nested_externs;
 303
 304 /* Nonzero means warn about pointer casts that can drop a type qualifier
 305    from the pointer target type.  */
 306
 307 extern int warn_cast_qual;
 308
 309 /* Nonzero means warn when casting a function call to a type that does
 310    not match the return type (e.g. (float)sqrt() or (anything*)malloc()
 311    when there is no previous declaration of sqrt or malloc.  */
 312
 313 extern int warn_bad_function_cast;
 314
 315 /* Warn about traditional constructs whose meanings changed in ANSI C.  */
 316
 317 extern int warn_traditional;
 318
 319 /* Warn about a subscript that has type char.  */
 320
 321 extern int warn_char_subscripts;
 322
 323 /* Warn if main is suspicious. */
 324
 325 extern int warn_main;
 326
 327 /* Nonzero means to allow single precision math even if we're generally
 328    being traditional. */
 329 extern int flag_allow_single_precision;
 330
 331 /* Warn if initializer is not completely bracketed.  */
 332
 333 extern int warn_missing_braces;
 334
 335 /* Warn about comparison of signed and unsigned values.  */
 336
 337 extern int warn_sign_compare;
 338
 339 /* Warn about testing equality of floating point numbers. */
 340
 341 extern int warn_float_equal;
 342
 343 /* Warn about multicharacter constants.  */
 344
 345 extern int warn_multichar;
 346
 347 /* Nonzero means we are reading code that came from a system header file.  */
 348
 349 extern int system_header_p;
 350
 351 /* Warn about implicit declarations.  1 = warning, 2 = error.  */
 352 extern int mesg_implicit_function_declaration;
 353
 354 /* In c-decl.c */
 355 extern void finish_incomplete_decl PARAMS ((tree));
 356
 357 #endif /* ! GCC_C_TREE_H */