gcc/c-tree.h

   1 /* Definitions for C parsing and type checking.
   2    Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998,
   3    1999, 2000 Free Software Foundation, Inc.
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU CC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU CC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22 #ifndef _C_TREE_H
  23 #define _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 tree_identifier ignore;
  40   tree global_value, local_value, label_value, implicit_decl;
  41   tree error_locus, limbo_value;
  42   enum rid rid_code;
  43 };
  44
  45 /* Wrapping c_lang_decl in another struct is an unfortunate
  46    necessity.  */
  47
  48 struct lang_decl
  49 {
  50   struct c_lang_decl base;
  51 };
  52
  53 /* Macros for access to language-specific slots in an identifier.  */
  54 /* Each of these slots contains a DECL node or null.  */
  55
  56 /* This represents the value which the identifier has in the
  57    file-scope namespace.  */
  58 #define IDENTIFIER_GLOBAL_VALUE(NODE)   \
  59   (((struct lang_identifier *) (NODE))->global_value)
  60 /* This represents the value which the identifier has in the current
  61    scope.  */
  62 #define IDENTIFIER_LOCAL_VALUE(NODE)    \
  63   (((struct lang_identifier *) (NODE))->local_value)
  64 /* This represents the value which the identifier has as a label in
  65    the current label scope.  */
  66 #define IDENTIFIER_LABEL_VALUE(NODE)    \
  67   (((struct lang_identifier *) (NODE))->label_value)
  68 /* This records the extern decl of this identifier, if it has had one
  69    at any point in this compilation.  */
  70 #define IDENTIFIER_LIMBO_VALUE(NODE)    \
  71   (((struct lang_identifier *) (NODE))->limbo_value)
  72 /* This records the implicit function decl of this identifier, if it
  73    has had one at any point in this compilation.  */
  74 #define IDENTIFIER_IMPLICIT_DECL(NODE)  \
  75   (((struct lang_identifier *) (NODE))->implicit_decl)
  76 /* This is the last function in which we printed an "undefined variable"
  77    message for this identifier.  Value is a FUNCTION_DECL or null.  */
  78 #define IDENTIFIER_ERROR_LOCUS(NODE)    \
  79   (((struct lang_identifier *) (NODE))->error_locus)
  80
  81 /* In identifiers, C uses the following fields in a special way:
  82    TREE_PUBLIC        to record that there was a previous local extern decl.
  83    TREE_USED          to record that such a decl was used.
  84    TREE_ADDRESSABLE   to record that the address of such a decl was used.  */
  85
  86 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only.  */
  87 #define C_TYPE_FIELDS_READONLY(type) TREE_LANG_FLAG_1 (type)
  88
  89 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile.  */
  90 #define C_TYPE_FIELDS_VOLATILE(type) TREE_LANG_FLAG_2 (type)
  91
  92 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
  93    nonzero if the definition of the type has already started.  */
  94 #define C_TYPE_BEING_DEFINED(type) TYPE_LANG_FLAG_0 (type)
  95
  96 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
  97    keyword.  C_RID_CODE (node) is then the RID_* value of the keyword,
  98    and C_RID_YYCODE is the token number wanted by Yacc.  */
  99
 100 #define C_IS_RESERVED_WORD(id) TREE_LANG_FLAG_0 (id)
 101 #define C_RID_CODE(id) \
 102   (((struct lang_identifier *) (id))->rid_code)
 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_enumerator                    PARAMS ((tree, tree));
 160
 161 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P)           \
 162   c_build_qualified_type (TYPE,                                   \
 163                           ((CONST_P) ? TYPE_QUAL_CONST : 0) |     \
 164                           ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
 165 extern int  c_decode_option                     PARAMS ((int, char **));
 166 extern void c_mark_varargs                      PARAMS ((void));
 167 extern void check_for_loop_decls                PARAMS ((void));
 168 extern tree check_identifier                    PARAMS ((tree, tree));
 169 extern void clear_parm_order                    PARAMS ((void));
 170 extern tree combine_parm_decls                  PARAMS ((tree, tree, int));
 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 shadow_label                        PARAMS ((tree));
 204 extern void shadow_record_fields                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                                                          tree));
 210 extern tree start_decl                          PARAMS ((tree, tree, int,
 211                                                          tree, 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                            PARAMS ((tree));
 222 extern tree c_sizeof_nowarn                     PARAMS ((tree));
 223 extern tree c_size_in_bytes                     PARAMS ((tree));
 224 extern tree c_alignof                           PARAMS ((tree));
 225 extern tree c_alignof_expr                      PARAMS ((tree));
 226 extern tree build_component_ref                 PARAMS ((tree, tree));
 227 extern tree build_indirect_ref                  PARAMS ((tree, const char *));
 228 extern tree build_array_ref                     PARAMS ((tree, tree));
 229 extern tree build_external_ref                  PARAMS ((tree, int));
 230 extern tree parser_build_binary_op              PARAMS ((enum tree_code,
 231                                                          tree, tree));
 232 extern void readonly_warning                    PARAMS ((tree, const char *));
 233 extern tree build_conditional_expr              PARAMS ((tree, tree, tree));
 234 extern tree build_compound_expr                 PARAMS ((tree));
 235 extern tree c_cast_expr                         PARAMS ((tree, tree));
 236 extern tree build_c_cast                        PARAMS ((tree, tree));
 237 extern tree build_modify_expr                   PARAMS ((tree, enum tree_code,
 238                                                          tree));
 239 extern void store_init_value                    PARAMS ((tree, tree));
 240 extern void error_init                          PARAMS ((const char *));
 241 extern void pedwarn_init                        PARAMS ((const char *));
 242 extern void start_init                          PARAMS ((tree, tree, int));
 243 extern void finish_init                         PARAMS ((void));
 244 extern void really_start_incremental_init       PARAMS ((tree));
 245 extern void push_init_level                     PARAMS ((int));
 246 extern tree pop_init_level                      PARAMS ((int));
 247 extern void set_init_index                      PARAMS ((tree, tree));
 248 extern void set_init_label                      PARAMS ((tree));
 249 extern void process_init_element                PARAMS ((tree));
 250 extern void pedwarn_c99                         PARAMS ((const char *, ...))
 251                                                         ATTRIBUTE_PRINTF_1;
 252 extern tree c_start_case                        PARAMS ((tree));
 253 extern void c_finish_case                       PARAMS ((void));
 254 extern tree simple_asm_stmt                     PARAMS ((tree));
 255 extern tree build_asm_stmt                      PARAMS ((tree, tree, tree,
 256                                                          tree, tree));
 257
 258 /* Set to 0 at beginning of a function definition, set to 1 if
 259    a return statement that specifies a return value is seen.  */
 260
 261 extern int current_function_returns_value;
 262
 263 /* Set to 0 at beginning of a function definition, set to 1 if
 264    a return statement with no argument is seen.  */
 265
 266 extern int current_function_returns_null;
 267
 268 /* Nonzero means the expression being parsed will never be evaluated.
 269    This is a count, since unevaluated expressions can nest.  */
 270
 271 extern int skip_evaluation;
 272
 273 /* Nonzero means `$' can be in an identifier.  */
 274
 275 extern int dollars_in_ident;
 276
 277 /* Nonzero means allow type mismatches in conditional expressions;
 278    just make their values `void'.   */
 279
 280 extern int flag_cond_mismatch;
 281
 282 /* Nonzero means don't recognize the keyword `asm'.  */
 283
 284 extern int flag_no_asm;
 285
 286 /* Nonzero means warn about implicit declarations.  */
 287
 288 extern int warn_implicit;
 289
 290 /* Nonzero means warn about sizeof (function) or addition/subtraction
 291    of function pointers.  */
 292
 293 extern int warn_pointer_arith;
 294
 295 /* Nonzero means warn for all old-style non-prototype function decls.  */
 296
 297 extern int warn_strict_prototypes;
 298
 299 /* Nonzero means warn about multiple (redundant) decls for the same single
 300    variable or function.  */
 301
 302 extern int warn_redundant_decls;
 303
 304 /* Nonzero means warn about extern declarations of objects not at
 305    file-scope level and about *all* declarations of functions (whether
 306    extern or static) not at file-scope level.  Note that we exclude
 307    implicit function declarations.  To get warnings about those, use
 308    -Wimplicit.  */
 309
 310 extern int warn_nested_externs;
 311
 312 /* Nonzero means warn about pointer casts that can drop a type qualifier
 313    from the pointer target type.  */
 314
 315 extern int warn_cast_qual;
 316
 317 /* Nonzero means warn when casting a function call to a type that does
 318    not match the return type (e.g. (float)sqrt() or (anything*)malloc()
 319    when there is no previous declaration of sqrt or malloc.  */
 320
 321 extern int warn_bad_function_cast;
 322
 323 /* Warn about traditional constructs whose meanings changed in ANSI C.  */
 324
 325 extern int warn_traditional;
 326
 327 /* Warn about a subscript that has type char.  */
 328
 329 extern int warn_char_subscripts;
 330
 331 /* Warn if main is suspicious. */
 332
 333 extern int warn_main;
 334
 335 /* Nonzero means to allow single precision math even if we're generally
 336    being traditional. */
 337 extern int flag_allow_single_precision;
 338
 339 /* Warn if initializer is not completely bracketed.  */
 340
 341 extern int warn_missing_braces;
 342
 343 /* Warn about comparison of signed and unsigned values.  */
 344
 345 extern int warn_sign_compare;
 346
 347 /* Warn about testing equality of floating point numbers. */
 348
 349 extern int warn_float_equal;
 350
 351 /* Warn about multicharacter constants.  */
 352
 353 extern int warn_multichar;
 354
 355 /* Nonzero means we are reading code that came from a system header file.  */
 356
 357 extern int system_header_p;
 358
 359 /* Warn about implicit declarations.  1 = warning, 2 = error.  */
 360 extern int mesg_implicit_function_declaration;
 361
 362 /* Nonzero enables objc features.  */
 363
 364 #define doing_objc_thang \
 365   (c_language == clk_objective_c)
 366
 367 /* In c-decl.c */
 368 extern void finish_incomplete_decl PARAMS ((tree));
 369
 370 #endif /* not _C_TREE_H */