gcc/c/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, 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011,
   4    2012 Free Software Foundation, Inc.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 3, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 #ifndef GCC_C_TREE_H
  23 #define GCC_C_TREE_H
  24
  25 #include "c-family/c-common.h"
  26 #include "diagnostic.h"
  27
  28 /* struct lang_identifier is private to c-decl.c, but langhooks.c needs to
  29    know how big it is.  This is sanity-checked in c-decl.c.  */
  30 #define C_SIZEOF_STRUCT_LANG_IDENTIFIER \
  31   (sizeof (struct c_common_identifier) + 3 * sizeof (void *))
  32
  33 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only.  */
  34 #define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1 (TYPE)
  35
  36 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile.  */
  37 #define C_TYPE_FIELDS_VOLATILE(TYPE) TREE_LANG_FLAG_2 (TYPE)
  38
  39 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
  40    nonzero if the definition of the type has already started.  */
  41 #define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE)
  42
  43 /* In an incomplete RECORD_TYPE or UNION_TYPE, a list of variable
  44    declarations whose type would be completed by completing that type.  */
  45 #define C_TYPE_INCOMPLETE_VARS(TYPE) TYPE_VFIELD (TYPE)
  46
  47 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
  48    keyword.  C_RID_CODE (node) is then the RID_* value of the keyword,
  49    and C_RID_YYCODE is the token number wanted by Yacc.  */
  50 #define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
  51
  52 /* Record whether a type or decl was written with nonconstant size.
  53    Note that TYPE_SIZE may have simplified to a constant.  */
  54 #define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
  55 #define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
  56
  57 /* Record whether a type is defined inside a struct or union type.
  58    This is used for -Wc++-compat. */
  59 #define C_TYPE_DEFINED_IN_STRUCT(TYPE) TYPE_LANG_FLAG_2 (TYPE)
  60
  61 /* Record whether a typedef for type `int' was actually `signed int'.  */
  62 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
  63
  64 /* For a FUNCTION_DECL, nonzero if it was defined without an explicit
  65    return type.  */
  66 #define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP)
  67
  68 /* For a FUNCTION_DECL, nonzero if it was an implicit declaration.  */
  69 #define C_DECL_IMPLICIT(EXP) DECL_LANG_FLAG_2 (EXP)
  70
  71 /* For FUNCTION_DECLs, evaluates true if the decl is built-in but has
  72    been declared.  */
  73 #define C_DECL_DECLARED_BUILTIN(EXP)            \
  74   DECL_LANG_FLAG_3 (FUNCTION_DECL_CHECK (EXP))
  75
  76 /* For FUNCTION_DECLs, evaluates true if the decl is built-in, has a
  77    built-in prototype and does not have a non-built-in prototype.  */
  78 #define C_DECL_BUILTIN_PROTOTYPE(EXP)           \
  79   DECL_LANG_FLAG_6 (FUNCTION_DECL_CHECK (EXP))
  80
  81 /* Record whether a decl was declared register.  This is strictly a
  82    front-end flag, whereas DECL_REGISTER is used for code generation;
  83    they may differ for structures with volatile fields.  */
  84 #define C_DECL_REGISTER(EXP) DECL_LANG_FLAG_4 (EXP)
  85
  86 /* Record whether a decl was used in an expression anywhere except an
  87    unevaluated operand of sizeof / typeof / alignof.  This is only
  88    used for functions declared static but not defined, though outside
  89    sizeof and typeof it is set for other function decls as well.  */
  90 #define C_DECL_USED(EXP) DECL_LANG_FLAG_5 (FUNCTION_DECL_CHECK (EXP))
  91
  92 /* Record whether a variable has been declared threadprivate by
  93    #pragma omp threadprivate.  */
  94 #define C_DECL_THREADPRIVATE_P(DECL) DECL_LANG_FLAG_3 (VAR_DECL_CHECK (DECL))
  95
  96 /* Nonzero for a decl which either doesn't exist or isn't a prototype.
  97    N.B. Could be simplified if all built-in decls had complete prototypes
  98    (but this is presently difficult because some of them need FILE*).  */
  99 #define C_DECL_ISNT_PROTOTYPE(EXP)                      \
 100        (EXP == 0                                        \
 101         || (!prototype_p (TREE_TYPE (EXP))      \
 102             && !DECL_BUILT_IN (EXP)))
 103
 104 /* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
 105    TYPE_ARG_TYPES for functions with prototypes, but created for functions
 106    without prototypes.  */
 107 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_LANG_SLOT_1 (NODE)
 108
 109 /* For a CONSTRUCTOR, whether some initializer contains a
 110    subexpression meaning it is not a constant expression.  */
 111 #define CONSTRUCTOR_NON_CONST(EXPR) TREE_LANG_FLAG_1 (CONSTRUCTOR_CHECK (EXPR))
 112
 113 /* Record parser information about an expression that is irrelevant
 114    for code generation alongside a tree representing its value.  */
 115 struct c_expr
 116 {
 117   /* The value of the expression.  */
 118   tree value;
 119   /* Record the original unary/binary operator of an expression, which may
 120      have been changed by fold, STRING_CST for unparenthesized string
 121      constants, C_MAYBE_CONST_EXPR for __builtin_constant_p calls
 122      (even if parenthesized), for subexpressions, and for non-constant
 123      initializers, or ERROR_MARK for other expressions (including
 124      parenthesized expressions).  */
 125   enum tree_code original_code;
 126   /* If not NULL, the original type of an expression.  This will
 127      differ from the type of the value field for an enum constant.
 128      The type of an enum constant is a plain integer type, but this
 129      field will be the enum type.  */
 130   tree original_type;
 131 };
 132
 133 /* Type alias for struct c_expr. This allows to use the structure
 134    inside the VEC types.  */
 135 typedef struct c_expr c_expr_t;
 136
 137 /* A varray of c_expr_t.  */
 138 DEF_VEC_O (c_expr_t);
 139 DEF_VEC_ALLOC_O (c_expr_t, gc);
 140 DEF_VEC_ALLOC_O (c_expr_t, heap);
 141
 142 /* Append a new c_expr_t element to V.  */
 143 #define C_EXPR_APPEND(V, ELEM) \
 144   do { \
 145     c_expr_t *__elem_p = VEC_safe_push (c_expr_t, gc, V, NULL); \
 146     *__elem_p = (ELEM); \
 147   } while (0)
 148
 149 /* A kind of type specifier.  Note that this information is currently
 150    only used to distinguish tag definitions, tag references and typeof
 151    uses.  */
 152 enum c_typespec_kind {
 153   /* No typespec.  This appears only in struct c_declspec.  */
 154   ctsk_none,
 155   /* A reserved keyword type specifier.  */
 156   ctsk_resword,
 157   /* A reference to a tag, previously declared, such as "struct foo".
 158      This includes where the previous declaration was as a different
 159      kind of tag, in which case this is only valid if shadowing that
 160      tag in an inner scope.  */
 161   ctsk_tagref,
 162   /* A reference to a tag, not previously declared in a visible
 163      scope.  */
 164   ctsk_tagfirstref,
 165   /* A definition of a tag such as "struct foo { int a; }".  */
 166   ctsk_tagdef,
 167   /* A typedef name.  */
 168   ctsk_typedef,
 169   /* An ObjC-specific kind of type specifier.  */
 170   ctsk_objc,
 171   /* A typeof specifier.  */
 172   ctsk_typeof
 173 };
 174
 175 /* A type specifier: this structure is created in the parser and
 176    passed to declspecs_add_type only.  */
 177 struct c_typespec {
 178   /* What kind of type specifier this is.  */
 179   enum c_typespec_kind kind;
 180   /* Whether the expression has operands suitable for use in constant
 181      expressions.  */
 182   bool expr_const_operands;
 183   /* The specifier itself.  */
 184   tree spec;
 185   /* An expression to be evaluated before the type specifier, in the
 186      case of typeof specifiers, or NULL otherwise or if no such
 187      expression is required for a particular typeof specifier.  In
 188      particular, when typeof is applied to an expression of variably
 189      modified type, that expression must be evaluated in order to
 190      determine array sizes that form part of the type, but the
 191      expression itself (as opposed to the array sizes) forms no part
 192      of the type and so needs to be recorded separately.  */
 193   tree expr;
 194 };
 195
 196 /* A storage class specifier.  */
 197 enum c_storage_class {
 198   csc_none,
 199   csc_auto,
 200   csc_extern,
 201   csc_register,
 202   csc_static,
 203   csc_typedef
 204 };
 205
 206 /* A type specifier keyword "void", "_Bool", "char", "int", "float",
 207    "double", "_Decimal32", "_Decimal64", "_Decimal128", "_Fract", "_Accum",
 208    or none of these.  */
 209 enum c_typespec_keyword {
 210   cts_none,
 211   cts_void,
 212   cts_bool,
 213   cts_char,
 214   cts_int,
 215   cts_float,
 216   cts_int128,
 217   cts_double,
 218   cts_dfloat32,
 219   cts_dfloat64,
 220   cts_dfloat128,
 221   cts_fract,
 222   cts_accum
 223 };
 224
 225 /* This enum lists all the possible declarator specifiers, storage
 226    class or attribute that a user can write.  There is at least one
 227    enumerator per possible declarator specifier in the struct
 228    c_declspecs below.
 229
 230    It is used to index the array of declspec locations in struct
 231    c_declspecs.  */
 232 enum c_declspec_word {
 233   cdw_typespec /* A catch-all for a typespec.  */,
 234   cdw_storage_class  /* A catch-all for a storage class */,
 235   cdw_attributes,
 236   cdw_typedef,
 237   cdw_explicit_signed,
 238   cdw_deprecated,
 239   cdw_default_int,
 240   cdw_long,
 241   cdw_long_long,
 242   cdw_short,
 243   cdw_signed,
 244   cdw_unsigned,
 245   cdw_complex,
 246   cdw_inline,
 247   cdw_noreturn,
 248   cdw_thread,
 249   cdw_const,
 250   cdw_volatile,
 251   cdw_restrict,
 252   cdw_saturating,
 253   cdw_alignas,
 254   cdw_address_space,
 255   cdw_number_of_elements /* This one must always be the last
 256                             enumerator.  */
 257 };
 258
 259 /* A sequence of declaration specifiers in C.  When a new declaration
 260    specifier is added, please update the enum c_declspec_word above
 261    accordingly.  */
 262 struct c_declspecs {
 263   source_location locations[cdw_number_of_elements];
 264   /* The type specified, if a single type specifier such as a struct,
 265      union or enum specifier, typedef name or typeof specifies the
 266      whole type, or NULL_TREE if none or a keyword such as "void" or
 267      "char" is used.  Does not include qualifiers.  */
 268   tree type;
 269   /* Any expression to be evaluated before the type, from a typeof
 270      specifier.  */
 271   tree expr;
 272   /* The attributes from a typedef decl.  */
 273   tree decl_attr;
 274   /* When parsing, the attributes.  Outside the parser, this will be
 275      NULL; attributes (possibly from multiple lists) will be passed
 276      separately.  */
 277   tree attrs;
 278   /* The base-2 log of the greatest alignment required by an _Alignas
 279      specifier, in bytes, or -1 if no such specifiers with nonzero
 280      alignment.  */
 281   int align_log;
 282   /* The storage class specifier, or csc_none if none.  */
 283   enum c_storage_class storage_class;
 284   /* Any type specifier keyword used such as "int", not reflecting
 285      modifiers such as "short", or cts_none if none.  */
 286   ENUM_BITFIELD (c_typespec_keyword) typespec_word : 8;
 287   /* The kind of type specifier if one has been seen, ctsk_none
 288      otherwise.  */
 289   ENUM_BITFIELD (c_typespec_kind) typespec_kind : 3;
 290   /* Whether any expressions in typeof specifiers may appear in
 291      constant expressions.  */
 292   BOOL_BITFIELD expr_const_operands : 1;
 293   /* Whether any declaration specifiers have been seen at all.  */
 294   BOOL_BITFIELD declspecs_seen_p : 1;
 295   /* Whether something other than a storage class specifier or
 296      attribute has been seen.  This is used to warn for the
 297      obsolescent usage of storage class specifiers other than at the
 298      start of the list.  (Doing this properly would require function
 299      specifiers to be handled separately from storage class
 300      specifiers.)  */
 301   BOOL_BITFIELD non_sc_seen_p : 1;
 302   /* Whether the type is specified by a typedef or typeof name.  */
 303   BOOL_BITFIELD typedef_p : 1;
 304   /* Whether the type is explicitly "signed" or specified by a typedef
 305      whose type is explicitly "signed".  */
 306   BOOL_BITFIELD explicit_signed_p : 1;
 307   /* Whether the specifiers include a deprecated typedef.  */
 308   BOOL_BITFIELD deprecated_p : 1;
 309   /* Whether the type defaulted to "int" because there were no type
 310      specifiers.  */
 311   BOOL_BITFIELD default_int_p : 1;
 312   /* Whether "long" was specified.  */
 313   BOOL_BITFIELD long_p : 1;
 314   /* Whether "long" was specified more than once.  */
 315   BOOL_BITFIELD long_long_p : 1;
 316   /* Whether "short" was specified.  */
 317   BOOL_BITFIELD short_p : 1;
 318   /* Whether "signed" was specified.  */
 319   BOOL_BITFIELD signed_p : 1;
 320   /* Whether "unsigned" was specified.  */
 321   BOOL_BITFIELD unsigned_p : 1;
 322   /* Whether "complex" was specified.  */
 323   BOOL_BITFIELD complex_p : 1;
 324   /* Whether "inline" was specified.  */
 325   BOOL_BITFIELD inline_p : 1;
 326   /* Whether "_Noreturn" was speciied.  */
 327   BOOL_BITFIELD noreturn_p : 1;
 328   /* Whether "__thread" was specified.  */
 329   BOOL_BITFIELD thread_p : 1;
 330   /* Whether "const" was specified.  */
 331   BOOL_BITFIELD const_p : 1;
 332   /* Whether "volatile" was specified.  */
 333   BOOL_BITFIELD volatile_p : 1;
 334   /* Whether "restrict" was specified.  */
 335   BOOL_BITFIELD restrict_p : 1;
 336   /* Whether "_Sat" was specified.  */
 337   BOOL_BITFIELD saturating_p : 1;
 338   /* Whether any alignment specifier (even with zero alignment) was
 339      specified.  */
 340   BOOL_BITFIELD alignas_p : 1;
 341   /* The address space that the declaration belongs to.  */
 342   addr_space_t address_space;
 343 };
 344
 345 /* The various kinds of declarators in C.  */
 346 enum c_declarator_kind {
 347   /* An identifier.  */
 348   cdk_id,
 349   /* A function.  */
 350   cdk_function,
 351   /* An array.  */
 352   cdk_array,
 353   /* A pointer.  */
 354   cdk_pointer,
 355   /* Parenthesized declarator with nested attributes.  */
 356   cdk_attrs
 357 };
 358
 359 typedef struct c_arg_tag_d {
 360   /* The argument name.  */
 361   tree id;
 362   /* The type of the argument.  */
 363   tree type;
 364 } c_arg_tag;
 365
 366 DEF_VEC_O(c_arg_tag);
 367 DEF_VEC_ALLOC_O(c_arg_tag,gc);
 368
 369 /* Information about the parameters in a function declarator.  */
 370 struct c_arg_info {
 371   /* A list of parameter decls.  */
 372   tree parms;
 373   /* A list of structure, union and enum tags defined.  */
 374   VEC(c_arg_tag,gc) *tags;
 375   /* A list of argument types to go in the FUNCTION_TYPE.  */
 376   tree types;
 377   /* A list of non-parameter decls (notably enumeration constants)
 378      defined with the parameters.  */
 379   tree others;
 380   /* A compound expression of VLA sizes from the parameters, or NULL.
 381      In a function definition, these are used to ensure that
 382      side-effects in sizes of arrays converted to pointers (such as a
 383      parameter int i[n++]) take place; otherwise, they are
 384      ignored.  */
 385   tree pending_sizes;
 386   /* True when these arguments had [*].  */
 387   BOOL_BITFIELD had_vla_unspec : 1;
 388 };
 389
 390 /* A declarator.  */
 391 struct c_declarator {
 392   /* The kind of declarator.  */
 393   enum c_declarator_kind kind;
 394   location_t id_loc; /* Currently only set for cdk_id, cdk_array. */
 395   /* Except for cdk_id, the contained declarator.  For cdk_id, NULL.  */
 396   struct c_declarator *declarator;
 397   union {
 398     /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
 399        declarator.  */
 400     tree id;
 401     /* For functions.  */
 402     struct c_arg_info *arg_info;
 403     /* For arrays.  */
 404     struct {
 405       /* The array dimension, or NULL for [] and [*].  */
 406       tree dimen;
 407       /* The qualifiers inside [].  */
 408       int quals;
 409       /* The attributes (currently ignored) inside [].  */
 410       tree attrs;
 411       /* Whether [static] was used.  */
 412       BOOL_BITFIELD static_p : 1;
 413       /* Whether [*] was used.  */
 414       BOOL_BITFIELD vla_unspec_p : 1;
 415     } array;
 416     /* For pointers, the qualifiers on the pointer type.  */
 417     int pointer_quals;
 418     /* For attributes.  */
 419     tree attrs;
 420   } u;
 421 };
 422
 423 /* A type name.  */
 424 struct c_type_name {
 425   /* The declaration specifiers.  */
 426   struct c_declspecs *specs;
 427   /* The declarator.  */
 428   struct c_declarator *declarator;
 429 };
 430
 431 /* A parameter.  */
 432 struct c_parm {
 433   /* The declaration specifiers, minus any prefix attributes.  */
 434   struct c_declspecs *specs;
 435   /* The attributes.  */
 436   tree attrs;
 437   /* The declarator.  */
 438   struct c_declarator *declarator;
 439 };
 440
 441 /* Used when parsing an enum.  Initialized by start_enum.  */
 442 struct c_enum_contents
 443 {
 444   /* While defining an enum type, this is 1 plus the last enumerator
 445      constant value.  */
 446   tree enum_next_value;
 447
 448   /* Nonzero means that there was overflow computing enum_next_value.  */
 449   int enum_overflow;
 450 };
 451
 452 /* A type of reference to a static identifier in an inline
 453    function.  */
 454 enum c_inline_static_type {
 455   /* Identifier with internal linkage used in function that may be an
 456      inline definition (i.e., file-scope static).  */
 457   csi_internal,
 458   /* Modifiable object with static storage duration defined in
 459      function that may be an inline definition (i.e., local
 460      static).  */
 461   csi_modifiable
 462 };
 463
 464 \f
 465 /* in c-parser.c */
 466 extern void c_parse_init (void);
 467
 468 /* in c-aux-info.c */
 469 extern void gen_aux_info_record (tree, int, int, int);
 470
 471 /* in c-decl.c */
 472 struct c_spot_bindings;
 473 struct c_struct_parse_info;
 474 extern struct obstack parser_obstack;
 475 extern tree c_break_label;
 476 extern tree c_cont_label;
 477
 478 extern bool global_bindings_p (void);
 479 extern void push_scope (void);
 480 extern tree pop_scope (void);
 481 extern void c_bindings_start_stmt_expr (struct c_spot_bindings *);
 482 extern void c_bindings_end_stmt_expr (struct c_spot_bindings *);
 483
 484 extern void record_inline_static (location_t, tree, tree,
 485                                   enum c_inline_static_type);
 486 extern void c_init_decl_processing (void);
 487 extern void c_print_identifier (FILE *, tree, int);
 488 extern int quals_from_declspecs (const struct c_declspecs *);
 489 extern struct c_declarator *build_array_declarator (location_t, tree,
 490                                                     struct c_declspecs *,
 491                                                     bool, bool);
 492 extern tree build_enumerator (location_t, location_t, struct c_enum_contents *,
 493                               tree, tree);
 494 extern tree check_for_loop_decls (location_t, bool);
 495 extern void mark_forward_parm_decls (void);
 496 extern void declare_parm_level (void);
 497 extern void undeclared_variable (location_t, tree);
 498 extern tree lookup_label_for_goto (location_t, tree);
 499 extern tree declare_label (tree);
 500 extern tree define_label (location_t, tree);
 501 extern struct c_spot_bindings *c_get_switch_bindings (void);
 502 extern void c_release_switch_bindings (struct c_spot_bindings *);
 503 extern bool c_check_switch_jump_warnings (struct c_spot_bindings *,
 504                                           location_t, location_t);
 505 extern void finish_decl (tree, location_t, tree, tree, tree);
 506 extern tree finish_enum (tree, tree, tree);
 507 extern void finish_function (void);
 508 extern tree finish_struct (location_t, tree, tree, tree,
 509                            struct c_struct_parse_info *);
 510 extern struct c_arg_info *build_arg_info (void);
 511 extern struct c_arg_info *get_parm_info (bool, tree);
 512 extern tree grokfield (location_t, struct c_declarator *,
 513                        struct c_declspecs *, tree, tree *);
 514 extern tree groktypename (struct c_type_name *, tree *, bool *);
 515 extern tree grokparm (const struct c_parm *, tree *);
 516 extern tree implicitly_declare (location_t, tree);
 517 extern void keep_next_level (void);
 518 extern void pending_xref_error (void);
 519 extern void c_push_function_context (void);
 520 extern void c_pop_function_context (void);
 521 extern void push_parm_decl (const struct c_parm *, tree *);
 522 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
 523                                                         struct c_declarator *);
 524 extern tree c_builtin_function (tree);
 525 extern tree c_builtin_function_ext_scope (tree);
 526 extern void shadow_tag (const struct c_declspecs *);
 527 extern void shadow_tag_warned (const struct c_declspecs *, int);
 528 extern tree start_enum (location_t, struct c_enum_contents *, tree);
 529 extern int  start_function (struct c_declspecs *, struct c_declarator *, tree);
 530 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
 531                         tree);
 532 extern tree start_struct (location_t, enum tree_code, tree,
 533                           struct c_struct_parse_info **);
 534 extern void store_parm_decls (void);
 535 extern void store_parm_decls_from (struct c_arg_info *);
 536 extern tree xref_tag (enum tree_code, tree);
 537 extern struct c_typespec parser_xref_tag (location_t, enum tree_code, tree);
 538 extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
 539                                     struct c_declarator *);
 540 extern struct c_declarator *build_attrs_declarator (tree,
 541                                                     struct c_declarator *);
 542 extern struct c_declarator *build_function_declarator (struct c_arg_info *,
 543                                                        struct c_declarator *);
 544 extern struct c_declarator *build_id_declarator (tree);
 545 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
 546                                                      struct c_declarator *);
 547 extern struct c_declspecs *build_null_declspecs (void);
 548 extern struct c_declspecs *declspecs_add_qual (source_location,
 549                                                struct c_declspecs *, tree);
 550 extern struct c_declspecs *declspecs_add_type (location_t,
 551                                                struct c_declspecs *,
 552                                                struct c_typespec);
 553 extern struct c_declspecs *declspecs_add_scspec (source_location,
 554                                                  struct c_declspecs *, tree);
 555 extern struct c_declspecs *declspecs_add_attrs (source_location,
 556                                                 struct c_declspecs *, tree);
 557 extern struct c_declspecs *declspecs_add_addrspace (source_location,
 558                                                     struct c_declspecs *,
 559                                                     addr_space_t);
 560 extern struct c_declspecs *declspecs_add_alignas (source_location,
 561                                                   struct c_declspecs *, tree);
 562 extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
 563
 564 /* in c-objc-common.c */
 565 extern bool c_objc_common_init (void);
 566 extern bool c_missing_noreturn_ok_p (tree);
 567 extern bool c_warn_unused_global_decl (const_tree);
 568 extern void c_initialize_diagnostics (diagnostic_context *);
 569 extern bool c_vla_unspec_p (tree x, tree fn);
 570
 571 /* in c-typeck.c */
 572 extern int in_alignof;
 573 extern int in_sizeof;
 574 extern int in_typeof;
 575
 576 extern tree c_last_sizeof_arg;
 577
 578 extern struct c_switch *c_switch_stack;
 579
 580 extern tree c_objc_common_truthvalue_conversion (location_t, tree);
 581 extern tree require_complete_type (tree);
 582 extern int same_translation_unit_p (const_tree, const_tree);
 583 extern int comptypes (tree, tree);
 584 extern int comptypes_check_different_types (tree, tree, bool *);
 585 extern bool c_vla_type_p (const_tree);
 586 extern bool c_mark_addressable (tree);
 587 extern void c_incomplete_type_error (const_tree, const_tree);
 588 extern tree c_type_promotes_to (tree);
 589 extern struct c_expr default_function_array_conversion (location_t,
 590                                                         struct c_expr);
 591 extern struct c_expr default_function_array_read_conversion (location_t,
 592                                                              struct c_expr);
 593 extern void mark_exp_read (tree);
 594 extern tree composite_type (tree, tree);
 595 extern tree build_component_ref (location_t, tree, tree);
 596 extern tree build_array_ref (location_t, tree, tree);
 597 extern tree build_external_ref (location_t, tree, int, tree *);
 598 extern void pop_maybe_used (bool);
 599 extern struct c_expr c_expr_sizeof_expr (location_t, struct c_expr);
 600 extern struct c_expr c_expr_sizeof_type (location_t, struct c_type_name *);
 601 extern struct c_expr parser_build_unary_op (location_t, enum tree_code,
 602                                             struct c_expr);
 603 extern struct c_expr parser_build_binary_op (location_t,
 604                                              enum tree_code, struct c_expr,
 605                                              struct c_expr);
 606 extern tree build_conditional_expr (location_t, tree, bool, tree, tree,
 607                                     tree, tree);
 608 extern tree build_compound_expr (location_t, tree, tree);
 609 extern tree c_cast_expr (location_t, struct c_type_name *, tree);
 610 extern tree build_c_cast (location_t, tree, tree);
 611 extern void store_init_value (location_t, tree, tree, tree);
 612 extern void error_init (const char *);
 613 extern void pedwarn_init (location_t, int opt, const char *);
 614 extern void maybe_warn_string_init (tree, struct c_expr);
 615 extern void start_init (tree, tree, int);
 616 extern void finish_init (void);
 617 extern void really_start_incremental_init (tree);
 618 extern void push_init_level (int, struct obstack *);
 619 extern struct c_expr pop_init_level (int, struct obstack *);
 620 extern void set_init_index (tree, tree, struct obstack *);
 621 extern void set_init_label (tree, struct obstack *);
 622 extern void process_init_element (struct c_expr, bool, struct obstack *);
 623 extern tree build_compound_literal (location_t, tree, tree, bool);
 624 extern void check_compound_literal_type (location_t, struct c_type_name *);
 625 extern tree c_start_case (location_t, location_t, tree);
 626 extern void c_finish_case (tree);
 627 extern tree build_asm_expr (location_t, tree, tree, tree, tree, tree, bool);
 628 extern tree build_asm_stmt (tree, tree);
 629 extern int c_types_compatible_p (tree, tree);
 630 extern tree c_begin_compound_stmt (bool);
 631 extern tree c_end_compound_stmt (location_t, tree, bool);
 632 extern void c_finish_if_stmt (location_t, tree, tree, tree, bool);
 633 extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, bool);
 634 extern tree c_begin_stmt_expr (void);
 635 extern tree c_finish_stmt_expr (location_t, tree);
 636 extern tree c_process_expr_stmt (location_t, tree);
 637 extern tree c_finish_expr_stmt (location_t, tree);
 638 extern tree c_finish_return (location_t, tree, tree);
 639 extern tree c_finish_bc_stmt (location_t, tree *, bool);
 640 extern tree c_finish_goto_label (location_t, tree);
 641 extern tree c_finish_goto_ptr (location_t, tree);
 642 extern tree c_expr_to_decl (tree, bool *, bool *);
 643 extern tree c_begin_omp_parallel (void);
 644 extern tree c_finish_omp_parallel (location_t, tree, tree);
 645 extern tree c_begin_omp_task (void);
 646 extern tree c_finish_omp_task (location_t, tree, tree);
 647 extern tree c_finish_omp_clauses (tree);
 648 extern tree c_build_va_arg (location_t, tree, tree);
 649 extern tree c_finish_transaction (location_t, tree, int);
 650
 651 /* Set to 0 at beginning of a function definition, set to 1 if
 652    a return statement that specifies a return value is seen.  */
 653
 654 extern int current_function_returns_value;
 655
 656 /* Set to 0 at beginning of a function definition, set to 1 if
 657    a return statement with no argument is seen.  */
 658
 659 extern int current_function_returns_null;
 660
 661 /* Set to 0 at beginning of a function definition, set to 1 if
 662    a call to a noreturn function is seen.  */
 663
 664 extern int current_function_returns_abnormally;
 665
 666 /* Mode used to build pointers (VOIDmode means ptr_mode).  */
 667
 668 extern enum machine_mode c_default_pointer_mode;
 669
 670 /* In c-decl.c */
 671 extern void c_finish_incomplete_decl (tree);
 672 extern void c_write_global_declarations (void);
 673
 674 /* In c-errors.c */
 675 extern void pedwarn_c90 (location_t, int opt, const char *, ...) ATTRIBUTE_GCC_DIAG(3,4);
 676 extern void pedwarn_c99 (location_t, int opt, const char *, ...) ATTRIBUTE_GCC_DIAG(3,4);
 677
 678 #endif /* ! GCC_C_TREE_H */