gcc/c/c-tree.h

   1 /* Definitions for C parsing and type checking.
   2    Copyright (C) 1987-2013 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef GCC_C_TREE_H
  21 #define GCC_C_TREE_H
  22
  23 #include "c-family/c-common.h"
  24 #include "diagnostic.h"
  25
  26 /* struct lang_identifier is private to c-decl.c, but langhooks.c needs to
  27    know how big it is.  This is sanity-checked in c-decl.c.  */
  28 #define C_SIZEOF_STRUCT_LANG_IDENTIFIER \
  29   (sizeof (struct c_common_identifier) + 3 * sizeof (void *))
  30
  31 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only.  */
  32 #define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1 (TYPE)
  33
  34 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile.  */
  35 #define C_TYPE_FIELDS_VOLATILE(TYPE) TREE_LANG_FLAG_2 (TYPE)
  36
  37 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
  38    nonzero if the definition of the type has already started.  */
  39 #define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE)
  40
  41 /* In an incomplete RECORD_TYPE or UNION_TYPE, a list of variable
  42    declarations whose type would be completed by completing that type.  */
  43 #define C_TYPE_INCOMPLETE_VARS(TYPE) TYPE_VFIELD (TYPE)
  44
  45 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
  46    keyword.  C_RID_CODE (node) is then the RID_* value of the keyword,
  47    and C_RID_YYCODE is the token number wanted by Yacc.  */
  48 #define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
  49
  50 /* Record whether a type or decl was written with nonconstant size.
  51    Note that TYPE_SIZE may have simplified to a constant.  */
  52 #define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
  53 #define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
  54
  55 /* Record whether a type is defined inside a struct or union type.
  56    This is used for -Wc++-compat. */
  57 #define C_TYPE_DEFINED_IN_STRUCT(TYPE) TYPE_LANG_FLAG_2 (TYPE)
  58
  59 /* Record whether a typedef for type `int' was actually `signed int'.  */
  60 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
  61
  62 /* For a FUNCTION_DECL, nonzero if it was defined without an explicit
  63    return type.  */
  64 #define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP)
  65
  66 /* For a FUNCTION_DECL, nonzero if it was an implicit declaration.  */
  67 #define C_DECL_IMPLICIT(EXP) DECL_LANG_FLAG_2 (EXP)
  68
  69 /* For FUNCTION_DECLs, evaluates true if the decl is built-in but has
  70    been declared.  */
  71 #define C_DECL_DECLARED_BUILTIN(EXP)            \
  72   DECL_LANG_FLAG_3 (FUNCTION_DECL_CHECK (EXP))
  73
  74 /* For FUNCTION_DECLs, evaluates true if the decl is built-in, has a
  75    built-in prototype and does not have a non-built-in prototype.  */
  76 #define C_DECL_BUILTIN_PROTOTYPE(EXP)           \
  77   DECL_LANG_FLAG_6 (FUNCTION_DECL_CHECK (EXP))
  78
  79 /* Record whether a decl was declared register.  This is strictly a
  80    front-end flag, whereas DECL_REGISTER is used for code generation;
  81    they may differ for structures with volatile fields.  */
  82 #define C_DECL_REGISTER(EXP) DECL_LANG_FLAG_4 (EXP)
  83
  84 /* Record whether a decl was used in an expression anywhere except an
  85    unevaluated operand of sizeof / typeof / alignof.  This is only
  86    used for functions declared static but not defined, though outside
  87    sizeof and typeof it is set for other function decls as well.  */
  88 #define C_DECL_USED(EXP) DECL_LANG_FLAG_5 (FUNCTION_DECL_CHECK (EXP))
  89
  90 /* Record whether a variable has been declared threadprivate by
  91    #pragma omp threadprivate.  */
  92 #define C_DECL_THREADPRIVATE_P(DECL) DECL_LANG_FLAG_3 (VAR_DECL_CHECK (DECL))
  93
  94 /* Nonzero for a decl which either doesn't exist or isn't a prototype.
  95    N.B. Could be simplified if all built-in decls had complete prototypes
  96    (but this is presently difficult because some of them need FILE*).  */
  97 #define C_DECL_ISNT_PROTOTYPE(EXP)                      \
  98        (EXP == 0                                        \
  99         || (!prototype_p (TREE_TYPE (EXP))      \
 100             && !DECL_BUILT_IN (EXP)))
 101
 102 /* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
 103    TYPE_ARG_TYPES for functions with prototypes, but created for functions
 104    without prototypes.  */
 105 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_LANG_SLOT_1 (NODE)
 106
 107 /* For a CONSTRUCTOR, whether some initializer contains a
 108    subexpression meaning it is not a constant expression.  */
 109 #define CONSTRUCTOR_NON_CONST(EXPR) TREE_LANG_FLAG_1 (CONSTRUCTOR_CHECK (EXPR))
 110
 111 /* Record parser information about an expression that is irrelevant
 112    for code generation alongside a tree representing its value.  */
 113 struct c_expr
 114 {
 115   /* The value of the expression.  */
 116   tree value;
 117   /* Record the original unary/binary operator of an expression, which may
 118      have been changed by fold, STRING_CST for unparenthesized string
 119      constants, C_MAYBE_CONST_EXPR for __builtin_constant_p calls
 120      (even if parenthesized), for subexpressions, and for non-constant
 121      initializers, or ERROR_MARK for other expressions (including
 122      parenthesized expressions).  */
 123   enum tree_code original_code;
 124   /* If not NULL, the original type of an expression.  This will
 125      differ from the type of the value field for an enum constant.
 126      The type of an enum constant is a plain integer type, but this
 127      field will be the enum type.  */
 128   tree original_type;
 129 };
 130
 131 /* Type alias for struct c_expr. This allows to use the structure
 132    inside the VEC types.  */
 133 typedef struct c_expr c_expr_t;
 134
 135 /* A varray of c_expr_t.  */
 136
 137 /* Append a new c_expr_t element to V.  */
 138 #define C_EXPR_APPEND(V, ELEM) \
 139   do { \
 140     c_expr_t __elem = (ELEM); \
 141     vec_safe_push (V, __elem); \
 142   } while (0)
 143
 144 /* A kind of type specifier.  Note that this information is currently
 145    only used to distinguish tag definitions, tag references and typeof
 146    uses.  */
 147 enum c_typespec_kind {
 148   /* No typespec.  This appears only in struct c_declspec.  */
 149   ctsk_none,
 150   /* A reserved keyword type specifier.  */
 151   ctsk_resword,
 152   /* A reference to a tag, previously declared, such as "struct foo".
 153      This includes where the previous declaration was as a different
 154      kind of tag, in which case this is only valid if shadowing that
 155      tag in an inner scope.  */
 156   ctsk_tagref,
 157   /* A reference to a tag, not previously declared in a visible
 158      scope.  */
 159   ctsk_tagfirstref,
 160   /* A definition of a tag such as "struct foo { int a; }".  */
 161   ctsk_tagdef,
 162   /* A typedef name.  */
 163   ctsk_typedef,
 164   /* An ObjC-specific kind of type specifier.  */
 165   ctsk_objc,
 166   /* A typeof specifier, or _Atomic ( type-name ).  */
 167   ctsk_typeof
 168 };
 169
 170 /* A type specifier: this structure is created in the parser and
 171    passed to declspecs_add_type only.  */
 172 struct c_typespec {
 173   /* What kind of type specifier this is.  */
 174   enum c_typespec_kind kind;
 175   /* Whether the expression has operands suitable for use in constant
 176      expressions.  */
 177   bool expr_const_operands;
 178   /* The specifier itself.  */
 179   tree spec;
 180   /* An expression to be evaluated before the type specifier, in the
 181      case of typeof specifiers, or NULL otherwise or if no such
 182      expression is required for a particular typeof specifier.  In
 183      particular, when typeof is applied to an expression of variably
 184      modified type, that expression must be evaluated in order to
 185      determine array sizes that form part of the type, but the
 186      expression itself (as opposed to the array sizes) forms no part
 187      of the type and so needs to be recorded separately.  */
 188   tree expr;
 189 };
 190
 191 /* A storage class specifier.  */
 192 enum c_storage_class {
 193   csc_none,
 194   csc_auto,
 195   csc_extern,
 196   csc_register,
 197   csc_static,
 198   csc_typedef
 199 };
 200
 201 /* A type specifier keyword "void", "_Bool", "char", "int", "float",
 202    "double", "_Decimal32", "_Decimal64", "_Decimal128", "_Fract", "_Accum",
 203    or none of these.  */
 204 enum c_typespec_keyword {
 205   cts_none,
 206   cts_void,
 207   cts_bool,
 208   cts_char,
 209   cts_int,
 210   cts_float,
 211   cts_int128,
 212   cts_double,
 213   cts_dfloat32,
 214   cts_dfloat64,
 215   cts_dfloat128,
 216   cts_fract,
 217   cts_accum
 218 };
 219
 220 /* This enum lists all the possible declarator specifiers, storage
 221    class or attribute that a user can write.  There is at least one
 222    enumerator per possible declarator specifier in the struct
 223    c_declspecs below.
 224
 225    It is used to index the array of declspec locations in struct
 226    c_declspecs.  */
 227 enum c_declspec_word {
 228   cdw_typespec /* A catch-all for a typespec.  */,
 229   cdw_storage_class  /* A catch-all for a storage class */,
 230   cdw_attributes,
 231   cdw_typedef,
 232   cdw_explicit_signed,
 233   cdw_deprecated,
 234   cdw_default_int,
 235   cdw_long,
 236   cdw_long_long,
 237   cdw_short,
 238   cdw_signed,
 239   cdw_unsigned,
 240   cdw_complex,
 241   cdw_inline,
 242   cdw_noreturn,
 243   cdw_thread,
 244   cdw_const,
 245   cdw_volatile,
 246   cdw_restrict,
 247   cdw_saturating,
 248   cdw_alignas,
 249   cdw_address_space,
 250   cdw_number_of_elements /* This one must always be the last
 251                             enumerator.  */
 252 };
 253
 254 /* A sequence of declaration specifiers in C.  When a new declaration
 255    specifier is added, please update the enum c_declspec_word above
 256    accordingly.  */
 257 struct c_declspecs {
 258   source_location locations[cdw_number_of_elements];
 259   /* The type specified, if a single type specifier such as a struct,
 260      union or enum specifier, typedef name or typeof specifies the
 261      whole type, or NULL_TREE if none or a keyword such as "void" or
 262      "char" is used.  Does not include qualifiers.  */
 263   tree type;
 264   /* Any expression to be evaluated before the type, from a typeof
 265      specifier.  */
 266   tree expr;
 267   /* The attributes from a typedef decl.  */
 268   tree decl_attr;
 269   /* When parsing, the attributes.  Outside the parser, this will be
 270      NULL; attributes (possibly from multiple lists) will be passed
 271      separately.  */
 272   tree attrs;
 273   /* For UPC, this is the blocking factor (layout qualifier).
 274      For example, shared [10] int x;  */
 275   tree upc_layout_qualifier;
 276   /* The base-2 log of the greatest alignment required by an _Alignas
 277      specifier, in bytes, or -1 if no such specifiers with nonzero
 278      alignment.  */
 279   int align_log;
 280   /* The storage class specifier, or csc_none if none.  */
 281   enum c_storage_class storage_class;
 282   /* Any type specifier keyword used such as "int", not reflecting
 283      modifiers such as "short", or cts_none if none.  */
 284   ENUM_BITFIELD (c_typespec_keyword) typespec_word : 8;
 285   /* The kind of type specifier if one has been seen, ctsk_none
 286      otherwise.  */
 287   ENUM_BITFIELD (c_typespec_kind) typespec_kind : 3;
 288   /* Whether any expressions in typeof specifiers may appear in
 289      constant expressions.  */
 290   BOOL_BITFIELD expr_const_operands : 1;
 291   /* Whether any declaration specifiers have been seen at all.  */
 292   BOOL_BITFIELD declspecs_seen_p : 1;
 293   /* Whether something other than a storage class specifier or
 294      attribute has been seen.  This is used to warn for the
 295      obsolescent usage of storage class specifiers other than at the
 296      start of the list.  (Doing this properly would require function
 297      specifiers to be handled separately from storage class
 298      specifiers.)  */
 299   BOOL_BITFIELD non_sc_seen_p : 1;
 300   /* Whether the type is specified by a typedef or typeof name.  */
 301   BOOL_BITFIELD typedef_p : 1;
 302   /* Whether the type is explicitly "signed" or specified by a typedef
 303      whose type is explicitly "signed".  */
 304   BOOL_BITFIELD explicit_signed_p : 1;
 305   /* Whether the specifiers include a deprecated typedef.  */
 306   BOOL_BITFIELD deprecated_p : 1;
 307   /* Whether the type defaulted to "int" because there were no type
 308      specifiers.  */
 309   BOOL_BITFIELD default_int_p : 1;
 310   /* Whether "long" was specified.  */
 311   BOOL_BITFIELD long_p : 1;
 312   /* Whether "long" was specified more than once.  */
 313   BOOL_BITFIELD long_long_p : 1;
 314   /* Whether "short" was specified.  */
 315   BOOL_BITFIELD short_p : 1;
 316   /* Whether "signed" was specified.  */
 317   BOOL_BITFIELD signed_p : 1;
 318   /* Whether "unsigned" was specified.  */
 319   BOOL_BITFIELD unsigned_p : 1;
 320   /* Whether "complex" was specified.  */
 321   BOOL_BITFIELD complex_p : 1;
 322   /* Whether "inline" was specified.  */
 323   BOOL_BITFIELD inline_p : 1;
 324   /* Whether "_Noreturn" was speciied.  */
 325   BOOL_BITFIELD noreturn_p : 1;
 326   /* Whether "__thread" was specified.  */
 327   BOOL_BITFIELD thread_p : 1;
 328   /* Whether "const" was specified.  */
 329   BOOL_BITFIELD const_p : 1;
 330   /* Whether "volatile" was specified.  */
 331   BOOL_BITFIELD volatile_p : 1;
 332   /* Whether "restrict" was specified.  */
 333   BOOL_BITFIELD restrict_p : 1;
 334   /* Whether "_Atomic" was specified.  */
 335   BOOL_BITFIELD atomic_p : 1;
 336   /* Whether "_Sat" was specified.  */
 337   BOOL_BITFIELD saturating_p : 1;
 338   /* Whether "shared" was specified.  */
 339   BOOL_BITFIELD shared_p : 1;
 340   /* Whether "strict" was specified.  */
 341   BOOL_BITFIELD strict_p : 1;
 342   /* Whether "relaxed" was specified.  */
 343   BOOL_BITFIELD relaxed_p : 1;
 344   /* Whether any alignment specifier (even with zero alignment) was
 345      specified.  */
 346   BOOL_BITFIELD alignas_p : 1;
 347   /* The address space that the declaration belongs to.  */
 348   addr_space_t address_space;
 349 };
 350
 351 /* The various kinds of declarators in C.  */
 352 enum c_declarator_kind {
 353   /* An identifier.  */
 354   cdk_id,
 355   /* A function.  */
 356   cdk_function,
 357   /* An array.  */
 358   cdk_array,
 359   /* A pointer.  */
 360   cdk_pointer,
 361   /* Parenthesized declarator with nested attributes.  */
 362   cdk_attrs
 363 };
 364
 365 typedef struct c_arg_tag_d {
 366   /* The argument name.  */
 367   tree id;
 368   /* The type of the argument.  */
 369   tree type;
 370 } c_arg_tag;
 371
 372
 373 /* Information about the parameters in a function declarator.  */
 374 struct c_arg_info {
 375   /* A list of parameter decls.  */
 376   tree parms;
 377   /* A list of structure, union and enum tags defined.  */
 378   vec<c_arg_tag, va_gc> *tags;
 379   /* A list of argument types to go in the FUNCTION_TYPE.  */
 380   tree types;
 381   /* A list of non-parameter decls (notably enumeration constants)
 382      defined with the parameters.  */
 383   tree others;
 384   /* A compound expression of VLA sizes from the parameters, or NULL.
 385      In a function definition, these are used to ensure that
 386      side-effects in sizes of arrays converted to pointers (such as a
 387      parameter int i[n++]) take place; otherwise, they are
 388      ignored.  */
 389   tree pending_sizes;
 390   /* True when these arguments had [*].  */
 391   BOOL_BITFIELD had_vla_unspec : 1;
 392 };
 393
 394 /* A declarator.  */
 395 struct c_declarator {
 396   /* The kind of declarator.  */
 397   enum c_declarator_kind kind;
 398   location_t id_loc; /* Currently only set for cdk_id, cdk_array. */
 399   /* Except for cdk_id, the contained declarator.  For cdk_id, NULL.  */
 400   struct c_declarator *declarator;
 401   union {
 402     /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
 403        declarator.  */
 404     tree id;
 405     /* For functions.  */
 406     struct c_arg_info *arg_info;
 407     /* For arrays.  */
 408     struct {
 409       /* The array dimension, or NULL for [] and [*].  */
 410       tree dimen;
 411       /* The qualifiers inside [].  */
 412       int quals;
 413       /* The attributes (currently ignored) inside [].  */
 414       tree attrs;
 415       /* Whether [static] was used.  */
 416       BOOL_BITFIELD static_p : 1;
 417       /* Whether [*] was used.  */
 418       BOOL_BITFIELD vla_unspec_p : 1;
 419     } array;
 420     /* For pointers, the qualifiers on the pointer type.  */
 421     struct {
 422       int quals;
 423       tree upc_layout_qual;
 424     } pointer;
 425     /* For attributes.  */
 426     tree attrs;
 427   } u;
 428 };
 429
 430 /* A type name.  */
 431 struct c_type_name {
 432   /* The declaration specifiers.  */
 433   struct c_declspecs *specs;
 434   /* The declarator.  */
 435   struct c_declarator *declarator;
 436 };
 437
 438 /* A parameter.  */
 439 struct c_parm {
 440   /* The declaration specifiers, minus any prefix attributes.  */
 441   struct c_declspecs *specs;
 442   /* The attributes.  */
 443   tree attrs;
 444   /* The declarator.  */
 445   struct c_declarator *declarator;
 446 };
 447
 448 /* Used when parsing an enum.  Initialized by start_enum.  */
 449 struct c_enum_contents
 450 {
 451   /* While defining an enum type, this is 1 plus the last enumerator
 452      constant value.  */
 453   tree enum_next_value;
 454
 455   /* Nonzero means that there was overflow computing enum_next_value.  */
 456   int enum_overflow;
 457 };
 458
 459 /* A type of reference to a static identifier in an inline
 460    function.  */
 461 enum c_inline_static_type {
 462   /* Identifier with internal linkage used in function that may be an
 463      inline definition (i.e., file-scope static).  */
 464   csi_internal,
 465   /* Modifiable object with static storage duration defined in
 466      function that may be an inline definition (i.e., local
 467      static).  */
 468   csi_modifiable
 469 };
 470
 471 \f
 472 /* in c-parser.c */
 473 extern void c_parse_init (void);
 474
 475 /* in c-aux-info.c */
 476 extern void gen_aux_info_record (tree, int, int, int);
 477
 478 /* in c-decl.c */
 479 struct c_spot_bindings;
 480 struct c_struct_parse_info;
 481 extern struct obstack parser_obstack;
 482 extern tree c_break_label;
 483 extern tree c_cont_label;
 484
 485 extern bool global_bindings_p (void);
 486 extern void push_scope (void);
 487 extern tree pop_scope (void);
 488 extern void c_bindings_start_stmt_expr (struct c_spot_bindings *);
 489 extern void c_bindings_end_stmt_expr (struct c_spot_bindings *);
 490
 491 extern void record_inline_static (location_t, tree, tree,
 492                                   enum c_inline_static_type);
 493 extern void c_init_decl_processing (void);
 494 extern void c_print_identifier (FILE *, tree, int);
 495 extern int quals_from_declspecs (const struct c_declspecs *);
 496 extern struct c_declarator *build_array_declarator (location_t, tree,
 497                                                     struct c_declspecs *,
 498                                                     bool, bool);
 499 extern tree build_enumerator (location_t, location_t, struct c_enum_contents *,
 500                               tree, tree);
 501 extern tree check_for_loop_decls (location_t, bool);
 502 extern void mark_forward_parm_decls (void);
 503 extern void declare_parm_level (void);
 504 extern void undeclared_variable (location_t, tree);
 505 extern tree lookup_label_for_goto (location_t, tree);
 506 extern tree declare_label (tree);
 507 extern tree define_label (location_t, tree);
 508 extern struct c_spot_bindings *c_get_switch_bindings (void);
 509 extern void c_release_switch_bindings (struct c_spot_bindings *);
 510 extern bool c_check_switch_jump_warnings (struct c_spot_bindings *,
 511                                           location_t, location_t);
 512 extern void finish_decl (tree, location_t, tree, tree, tree);
 513 extern tree finish_enum (tree, tree, tree);
 514 extern void finish_function (void);
 515 extern tree finish_struct (location_t, tree, tree, tree,
 516                            struct c_struct_parse_info *);
 517 extern struct c_arg_info *build_arg_info (void);
 518 extern struct c_arg_info *get_parm_info (bool, tree);
 519 extern tree grokfield (location_t, struct c_declarator *,
 520                        struct c_declspecs *, tree, tree *);
 521 extern tree groktypename (struct c_type_name *, tree *, bool *);
 522 extern tree grokparm (const struct c_parm *, tree *);
 523 extern tree implicitly_declare (location_t, tree);
 524 extern void keep_next_level (void);
 525 extern void pending_xref_error (void);
 526 extern void c_push_function_context (void);
 527 extern void c_pop_function_context (void);
 528 extern void push_parm_decl (const struct c_parm *, tree *);
 529 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
 530                                                         struct c_declarator *);
 531 extern tree c_builtin_function (tree);
 532 extern tree c_builtin_function_ext_scope (tree);
 533 extern void shadow_tag (const struct c_declspecs *);
 534 extern void shadow_tag_warned (const struct c_declspecs *, int);
 535 extern tree start_enum (location_t, struct c_enum_contents *, tree);
 536 extern int  start_function (struct c_declspecs *, struct c_declarator *, tree);
 537 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
 538                         tree);
 539 extern tree start_struct (location_t, enum tree_code, tree,
 540                           struct c_struct_parse_info **);
 541 extern void store_parm_decls (void);
 542 extern void store_parm_decls_from (struct c_arg_info *);
 543 extern void temp_store_parm_decls (tree, tree);
 544 extern void temp_pop_parm_decls (void);
 545 extern tree xref_tag (enum tree_code, tree);
 546 extern struct c_typespec parser_xref_tag (location_t, enum tree_code, tree);
 547 extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
 548                                     struct c_declarator *);
 549 extern struct c_declarator *build_attrs_declarator (tree,
 550                                                     struct c_declarator *);
 551 extern struct c_declarator *build_function_declarator (struct c_arg_info *,
 552                                                        struct c_declarator *);
 553 extern struct c_declarator *build_id_declarator (tree);
 554 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
 555                                                      struct c_declarator *);
 556 extern struct c_declspecs *build_null_declspecs (void);
 557 extern struct c_declspecs *declspecs_add_qual (source_location,
 558                                                struct c_declspecs *, tree);
 559 extern struct c_declspecs *declspecs_add_type (location_t,
 560                                                struct c_declspecs *,
 561                                                struct c_typespec);
 562 extern struct c_declspecs *declspecs_add_scspec (source_location,
 563                                                  struct c_declspecs *, tree);
 564 extern struct c_declspecs *declspecs_add_attrs (source_location,
 565                                                 struct c_declspecs *, tree);
 566 extern struct c_declspecs *declspecs_add_addrspace (source_location,
 567                                                     struct c_declspecs *,
 568                                                     addr_space_t);
 569 extern struct c_declspecs *declspecs_add_alignas (source_location,
 570                                                   struct c_declspecs *, tree);
 571 extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
 572
 573 /* in c-objc-common.c */
 574 extern bool c_objc_common_init (void);
 575 extern bool c_missing_noreturn_ok_p (tree);
 576 extern bool c_warn_unused_global_decl (const_tree);
 577 extern void c_initialize_diagnostics (diagnostic_context *);
 578 extern bool c_vla_unspec_p (tree x, tree fn);
 579
 580 /* in c-typeck.c */
 581 extern int in_alignof;
 582 extern int in_sizeof;
 583 extern int in_typeof;
 584
 585 extern tree c_last_sizeof_arg;
 586
 587 extern struct c_switch *c_switch_stack;
 588
 589 extern tree c_objc_common_truthvalue_conversion (location_t, tree);
 590 extern tree require_complete_type (tree);
 591 extern int same_translation_unit_p (const_tree, const_tree);
 592 extern int comptypes (tree, tree);
 593 extern int comptypes_check_different_types (tree, tree, bool *);
 594 extern bool c_vla_type_p (const_tree);
 595 extern bool c_mark_addressable (tree);
 596 extern void c_incomplete_type_error (const_tree, const_tree);
 597 extern tree c_type_promotes_to (tree);
 598 extern struct c_expr default_function_array_conversion (location_t,
 599                                                         struct c_expr);
 600 extern struct c_expr default_function_array_read_conversion (location_t,
 601                                                              struct c_expr);
 602 extern struct c_expr convert_lvalue_to_rvalue (location_t, struct c_expr,
 603                                                bool, bool);
 604 extern void mark_exp_read (tree);
 605 extern tree composite_type (tree, tree);
 606 extern tree build_component_ref (location_t, tree, tree);
 607 extern tree build_array_ref (location_t, tree, tree);
 608 extern tree build_external_ref (location_t, tree, int, tree *);
 609 extern void pop_maybe_used (bool);
 610 extern struct c_expr c_expr_sizeof_expr (location_t, struct c_expr);
 611 extern struct c_expr c_expr_sizeof_type (location_t, struct c_type_name *);
 612 extern struct c_expr parser_build_unary_op (location_t, enum tree_code,
 613                                             struct c_expr);
 614 extern struct c_expr parser_build_binary_op (location_t,
 615                                              enum tree_code, struct c_expr,
 616                                              struct c_expr);
 617 extern tree build_conditional_expr (location_t, tree, bool, tree, tree,
 618                                     tree, tree);
 619 extern tree build_compound_expr (location_t, tree, tree);
 620 extern tree c_cast_expr (location_t, struct c_type_name *, tree);
 621 extern tree build_c_cast (location_t, tree, tree);
 622 extern void store_init_value (location_t, tree, tree, tree);
 623 extern void error_init (const char *);
 624 extern void pedwarn_init (location_t, int opt, const char *);
 625 extern void maybe_warn_string_init (tree, struct c_expr);
 626 extern void start_init (tree, tree, int);
 627 extern void finish_init (void);
 628 extern void really_start_incremental_init (tree);
 629 extern void push_init_level (int, struct obstack *);
 630 extern struct c_expr pop_init_level (int, struct obstack *);
 631 extern void set_init_index (tree, tree, struct obstack *);
 632 extern void set_init_label (tree, struct obstack *);
 633 extern void process_init_element (struct c_expr, bool, struct obstack *);
 634 extern tree build_compound_literal (location_t, tree, tree, bool);
 635 extern void check_compound_literal_type (location_t, struct c_type_name *);
 636 extern tree c_start_case (location_t, location_t, tree);
 637 extern void c_finish_case (tree);
 638 extern tree build_asm_expr (location_t, tree, tree, tree, tree, tree, bool);
 639 extern tree build_asm_stmt (tree, tree);
 640 extern int c_types_compatible_p (tree, tree);
 641 extern tree c_begin_compound_stmt (bool);
 642 extern tree c_end_compound_stmt (location_t, tree, bool);
 643 extern void c_finish_if_stmt (location_t, tree, tree, tree, bool);
 644 extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, bool);
 645 extern tree c_begin_stmt_expr (void);
 646 extern tree c_finish_stmt_expr (location_t, tree);
 647 extern tree c_process_expr_stmt (location_t, tree);
 648 extern tree c_finish_expr_stmt (location_t, tree);
 649 extern tree c_finish_return (location_t, tree, tree);
 650 extern tree c_finish_bc_stmt (location_t, tree *, bool);
 651 extern tree c_finish_goto_label (location_t, tree);
 652 extern tree c_finish_goto_ptr (location_t, tree);
 653 extern tree c_expr_to_decl (tree, bool *, bool *);
 654 extern tree c_begin_omp_parallel (void);
 655 extern tree c_finish_omp_parallel (location_t, tree, tree);
 656 extern tree c_begin_omp_task (void);
 657 extern tree c_finish_omp_task (location_t, tree, tree);
 658 extern void c_finish_omp_cancel (location_t, tree);
 659 extern void c_finish_omp_cancellation_point (location_t, tree);
 660 extern tree c_finish_omp_clauses (tree);
 661 extern tree c_build_va_arg (location_t, tree, tree);
 662 extern tree c_finish_transaction (location_t, tree, int);
 663 extern tree c_cvt_expr_for_assign (location_t, tree, tree);
 664 extern bool c_tree_equal (tree, tree);
 665
 666 /* Set to 0 at beginning of a function definition, set to 1 if
 667    a return statement that specifies a return value is seen.  */
 668
 669 extern int current_function_returns_value;
 670
 671 /* Set to 0 at beginning of a function definition, set to 1 if
 672    a return statement with no argument is seen.  */
 673
 674 extern int current_function_returns_null;
 675
 676 /* Set to 0 at beginning of a function definition, set to 1 if
 677    a call to a noreturn function is seen.  */
 678
 679 extern int current_function_returns_abnormally;
 680
 681 /* Mode used to build pointers (VOIDmode means ptr_mode).  */
 682
 683 extern enum machine_mode c_default_pointer_mode;
 684
 685 /* In c-decl.c */
 686 extern void c_finish_incomplete_decl (tree);
 687 extern void c_write_global_declarations (void);
 688 extern tree c_omp_reduction_id (enum tree_code, tree);
 689 extern tree c_omp_reduction_decl (tree);
 690 extern tree c_omp_reduction_lookup (tree, tree);
 691 extern tree c_check_omp_declare_reduction_r (tree *, int *, void *);
 692
 693 /* In c-errors.c */
 694 extern void pedwarn_c90 (location_t, int opt, const char *, ...) ATTRIBUTE_GCC_DIAG(3,4);
 695 extern void pedwarn_c99 (location_t, int opt, const char *, ...) ATTRIBUTE_GCC_DIAG(3,4);
 696
 697 #endif /* ! GCC_C_TREE_H */