gcc/c/c-tree.h

   1 /* Definitions for C parsing and type checking.
   2    Copyright (C) 1987-2015 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 an "incomplete type" error was given for the type.  */
  60 #define C_TYPE_ERROR_REPORTED(TYPE) TYPE_LANG_FLAG_3 (TYPE)
  61
  62 /* Record whether a typedef for type `int' was actually `signed int'.  */
  63 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
  64
  65 /* For a FUNCTION_DECL, nonzero if it was defined without an explicit
  66    return type.  */
  67 #define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP)
  68
  69 /* For a FUNCTION_DECL, nonzero if it was an implicit declaration.  */
  70 #define C_DECL_IMPLICIT(EXP) DECL_LANG_FLAG_2 (EXP)
  71
  72 /* For a PARM_DECL, nonzero if it was declared as an array.  */
  73 #define C_ARRAY_PARAMETER(NODE) DECL_LANG_FLAG_0 (NODE)
  74
  75 /* For FUNCTION_DECLs, evaluates true if the decl is built-in but has
  76    been declared.  */
  77 #define C_DECL_DECLARED_BUILTIN(EXP)            \
  78   DECL_LANG_FLAG_3 (FUNCTION_DECL_CHECK (EXP))
  79
  80 /* For FUNCTION_DECLs, evaluates true if the decl is built-in, has a
  81    built-in prototype and does not have a non-built-in prototype.  */
  82 #define C_DECL_BUILTIN_PROTOTYPE(EXP)           \
  83   DECL_LANG_FLAG_6 (FUNCTION_DECL_CHECK (EXP))
  84
  85 /* Record whether a decl was declared register.  This is strictly a
  86    front-end flag, whereas DECL_REGISTER is used for code generation;
  87    they may differ for structures with volatile fields.  */
  88 #define C_DECL_REGISTER(EXP) DECL_LANG_FLAG_4 (EXP)
  89
  90 /* Record whether a decl was used in an expression anywhere except an
  91    unevaluated operand of sizeof / typeof / alignof.  This is only
  92    used for functions declared static but not defined, though outside
  93    sizeof and typeof it is set for other function decls as well.  */
  94 #define C_DECL_USED(EXP) DECL_LANG_FLAG_5 (FUNCTION_DECL_CHECK (EXP))
  95
  96 /* Record whether a variable has been declared threadprivate by
  97    #pragma omp threadprivate.  */
  98 #define C_DECL_THREADPRIVATE_P(DECL) DECL_LANG_FLAG_3 (VAR_DECL_CHECK (DECL))
  99
 100 /* Nonzero for a decl which either doesn't exist or isn't a prototype.
 101    N.B. Could be simplified if all built-in decls had complete prototypes
 102    (but this is presently difficult because some of them need FILE*).  */
 103 #define C_DECL_ISNT_PROTOTYPE(EXP)                      \
 104        (EXP == 0                                        \
 105         || (!prototype_p (TREE_TYPE (EXP))      \
 106             && !DECL_BUILT_IN (EXP)))
 107
 108 /* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
 109    TYPE_ARG_TYPES for functions with prototypes, but created for functions
 110    without prototypes.  */
 111 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_LANG_SLOT_1 (NODE)
 112
 113 /* For a CONSTRUCTOR, whether some initializer contains a
 114    subexpression meaning it is not a constant expression.  */
 115 #define CONSTRUCTOR_NON_CONST(EXPR) TREE_LANG_FLAG_1 (CONSTRUCTOR_CHECK (EXPR))
 116
 117 /* Record parser information about an expression that is irrelevant
 118    for code generation alongside a tree representing its value.  */
 119 struct c_expr
 120 {
 121   /* The value of the expression.  */
 122   tree value;
 123   /* Record the original unary/binary operator of an expression, which may
 124      have been changed by fold, STRING_CST for unparenthesized string
 125      constants, C_MAYBE_CONST_EXPR for __builtin_constant_p calls
 126      (even if parenthesized), for subexpressions, and for non-constant
 127      initializers, or ERROR_MARK for other expressions (including
 128      parenthesized expressions).  */
 129   enum tree_code original_code;
 130   /* If not NULL, the original type of an expression.  This will
 131      differ from the type of the value field for an enum constant.
 132      The type of an enum constant is a plain integer type, but this
 133      field will be the enum type.  */
 134   tree original_type;
 135 };
 136
 137 /* Type alias for struct c_expr. This allows to use the structure
 138    inside the VEC types.  */
 139 typedef struct c_expr c_expr_t;
 140
 141 /* A kind of type specifier.  Note that this information is currently
 142    only used to distinguish tag definitions, tag references and typeof
 143    uses.  */
 144 enum c_typespec_kind {
 145   /* No typespec.  This appears only in struct c_declspec.  */
 146   ctsk_none,
 147   /* A reserved keyword type specifier.  */
 148   ctsk_resword,
 149   /* A reference to a tag, previously declared, such as "struct foo".
 150      This includes where the previous declaration was as a different
 151      kind of tag, in which case this is only valid if shadowing that
 152      tag in an inner scope.  */
 153   ctsk_tagref,
 154   /* A reference to a tag, not previously declared in a visible
 155      scope.  */
 156   ctsk_tagfirstref,
 157   /* A definition of a tag such as "struct foo { int a; }".  */
 158   ctsk_tagdef,
 159   /* A typedef name.  */
 160   ctsk_typedef,
 161   /* An ObjC-specific kind of type specifier.  */
 162   ctsk_objc,
 163   /* A typeof specifier, or _Atomic ( type-name ).  */
 164   ctsk_typeof
 165 };
 166
 167 /* A type specifier: this structure is created in the parser and
 168    passed to declspecs_add_type only.  */
 169 struct c_typespec {
 170   /* What kind of type specifier this is.  */
 171   enum c_typespec_kind kind;
 172   /* Whether the expression has operands suitable for use in constant
 173      expressions.  */
 174   bool expr_const_operands;
 175   /* The specifier itself.  */
 176   tree spec;
 177   /* An expression to be evaluated before the type specifier, in the
 178      case of typeof specifiers, or NULL otherwise or if no such
 179      expression is required for a particular typeof specifier.  In
 180      particular, when typeof is applied to an expression of variably
 181      modified type, that expression must be evaluated in order to
 182      determine array sizes that form part of the type, but the
 183      expression itself (as opposed to the array sizes) forms no part
 184      of the type and so needs to be recorded separately.  */
 185   tree expr;
 186 };
 187
 188 /* A storage class specifier.  */
 189 enum c_storage_class {
 190   csc_none,
 191   csc_auto,
 192   csc_extern,
 193   csc_register,
 194   csc_static,
 195   csc_typedef
 196 };
 197
 198 /* A type specifier keyword "void", "_Bool", "char", "int", "float",
 199    "double", "_Decimal32", "_Decimal64", "_Decimal128", "_Fract", "_Accum",
 200    or none of these.  */
 201 enum c_typespec_keyword {
 202   cts_none,
 203   cts_void,
 204   cts_bool,
 205   cts_char,
 206   cts_int,
 207   cts_float,
 208   cts_int_n,
 209   cts_double,
 210   cts_dfloat32,
 211   cts_dfloat64,
 212   cts_dfloat128,
 213   cts_fract,
 214   cts_accum,
 215   cts_auto_type
 216 };
 217
 218 /* This enum lists all the possible declarator specifiers, storage
 219    class or attribute that a user can write.  There is at least one
 220    enumerator per possible declarator specifier in the struct
 221    c_declspecs below.
 222
 223    It is used to index the array of declspec locations in struct
 224    c_declspecs.  */
 225 enum c_declspec_word {
 226   cdw_typespec /* A catch-all for a typespec.  */,
 227   cdw_storage_class  /* A catch-all for a storage class */,
 228   cdw_attributes,
 229   cdw_typedef,
 230   cdw_explicit_signed,
 231   cdw_deprecated,
 232   cdw_default_int,
 233   cdw_long,
 234   cdw_long_long,
 235   cdw_short,
 236   cdw_signed,
 237   cdw_unsigned,
 238   cdw_complex,
 239   cdw_inline,
 240   cdw_noreturn,
 241   cdw_thread,
 242   cdw_const,
 243   cdw_volatile,
 244   cdw_restrict,
 245   cdw_saturating,
 246   cdw_alignas,
 247   cdw_address_space,
 248   cdw_number_of_elements /* This one must always be the last
 249                             enumerator.  */
 250 };
 251
 252 /* A sequence of declaration specifiers in C.  When a new declaration
 253    specifier is added, please update the enum c_declspec_word above
 254    accordingly.  */
 255 struct c_declspecs {
 256   source_location locations[cdw_number_of_elements];
 257   /* The type specified, if a single type specifier such as a struct,
 258      union or enum specifier, typedef name or typeof specifies the
 259      whole type, or NULL_TREE if none or a keyword such as "void" or
 260      "char" is used.  Does not include qualifiers.  */
 261   tree type;
 262   /* Any expression to be evaluated before the type, from a typeof
 263      specifier.  */
 264   tree expr;
 265   /* The attributes from a typedef decl.  */
 266   tree decl_attr;
 267   /* When parsing, the attributes.  Outside the parser, this will be
 268      NULL; attributes (possibly from multiple lists) will be passed
 269      separately.  */
 270   tree attrs;
 271   /* The base-2 log of the greatest alignment required by an _Alignas
 272      specifier, in bytes, or -1 if no such specifiers with nonzero
 273      alignment.  */
 274   int align_log;
 275   /* For the __intN declspec, this stores the index into the int_n_* arrays.  */
 276   int int_n_idx;
 277   /* The storage class specifier, or csc_none if none.  */
 278   enum c_storage_class storage_class;
 279   /* Any type specifier keyword used such as "int", not reflecting
 280      modifiers such as "short", or cts_none if none.  */
 281   ENUM_BITFIELD (c_typespec_keyword) typespec_word : 8;
 282   /* The kind of type specifier if one has been seen, ctsk_none
 283      otherwise.  */
 284   ENUM_BITFIELD (c_typespec_kind) typespec_kind : 3;
 285   /* Whether any expressions in typeof specifiers may appear in
 286      constant expressions.  */
 287   BOOL_BITFIELD expr_const_operands : 1;
 288   /* Whether any declaration specifiers have been seen at all.  */
 289   BOOL_BITFIELD declspecs_seen_p : 1;
 290   /* Whether something other than a storage class specifier or
 291      attribute has been seen.  This is used to warn for the
 292      obsolescent usage of storage class specifiers other than at the
 293      start of the list.  (Doing this properly would require function
 294      specifiers to be handled separately from storage class
 295      specifiers.)  */
 296   BOOL_BITFIELD non_sc_seen_p : 1;
 297   /* Whether the type is specified by a typedef or typeof name.  */
 298   BOOL_BITFIELD typedef_p : 1;
 299   /* Whether the type is explicitly "signed" or specified by a typedef
 300      whose type is explicitly "signed".  */
 301   BOOL_BITFIELD explicit_signed_p : 1;
 302   /* Whether the specifiers include a deprecated typedef.  */
 303   BOOL_BITFIELD deprecated_p : 1;
 304   /* Whether the type defaulted to "int" because there were no type
 305      specifiers.  */
 306   BOOL_BITFIELD default_int_p : 1;
 307   /* Whether "long" was specified.  */
 308   BOOL_BITFIELD long_p : 1;
 309   /* Whether "long" was specified more than once.  */
 310   BOOL_BITFIELD long_long_p : 1;
 311   /* Whether "short" was specified.  */
 312   BOOL_BITFIELD short_p : 1;
 313   /* Whether "signed" was specified.  */
 314   BOOL_BITFIELD signed_p : 1;
 315   /* Whether "unsigned" was specified.  */
 316   BOOL_BITFIELD unsigned_p : 1;
 317   /* Whether "complex" was specified.  */
 318   BOOL_BITFIELD complex_p : 1;
 319   /* Whether "inline" was specified.  */
 320   BOOL_BITFIELD inline_p : 1;
 321   /* Whether "_Noreturn" was speciied.  */
 322   BOOL_BITFIELD noreturn_p : 1;
 323   /* Whether "__thread" or "_Thread_local" was specified.  */
 324   BOOL_BITFIELD thread_p : 1;
 325   /* Whether "__thread" rather than "_Thread_local" was specified.  */
 326   BOOL_BITFIELD thread_gnu_p : 1;
 327   /* Whether "const" was specified.  */
 328   BOOL_BITFIELD const_p : 1;
 329   /* Whether "volatile" was specified.  */
 330   BOOL_BITFIELD volatile_p : 1;
 331   /* Whether "restrict" was specified.  */
 332   BOOL_BITFIELD restrict_p : 1;
 333   /* Whether "_Atomic" was specified.  */
 334   BOOL_BITFIELD atomic_p : 1;
 335   /* Whether "_Sat" was specified.  */
 336   BOOL_BITFIELD saturating_p : 1;
 337   /* Whether any alignment specifier (even with zero alignment) was
 338      specified.  */
 339   BOOL_BITFIELD alignas_p : 1;
 340   /* The address space that the declaration belongs to.  */
 341   addr_space_t address_space;
 342 };
 343
 344 /* The various kinds of declarators in C.  */
 345 enum c_declarator_kind {
 346   /* An identifier.  */
 347   cdk_id,
 348   /* A function.  */
 349   cdk_function,
 350   /* An array.  */
 351   cdk_array,
 352   /* A pointer.  */
 353   cdk_pointer,
 354   /* Parenthesized declarator with nested attributes.  */
 355   cdk_attrs
 356 };
 357
 358 typedef struct c_arg_tag_d {
 359   /* The argument name.  */
 360   tree id;
 361   /* The type of the argument.  */
 362   tree type;
 363 } c_arg_tag;
 364
 365
 366 /* Information about the parameters in a function declarator.  */
 367 struct c_arg_info {
 368   /* A list of parameter decls.  */
 369   tree parms;
 370   /* A list of structure, union and enum tags defined.  */
 371   vec<c_arg_tag, va_gc> *tags;
 372   /* A list of argument types to go in the FUNCTION_TYPE.  */
 373   tree types;
 374   /* A list of non-parameter decls (notably enumeration constants)
 375      defined with the parameters.  */
 376   tree others;
 377   /* A compound expression of VLA sizes from the parameters, or NULL.
 378      In a function definition, these are used to ensure that
 379      side-effects in sizes of arrays converted to pointers (such as a
 380      parameter int i[n++]) take place; otherwise, they are
 381      ignored.  */
 382   tree pending_sizes;
 383   /* True when these arguments had [*].  */
 384   BOOL_BITFIELD had_vla_unspec : 1;
 385 };
 386
 387 /* A declarator.  */
 388 struct c_declarator {
 389   /* The kind of declarator.  */
 390   enum c_declarator_kind kind;
 391   location_t id_loc; /* Currently only set for cdk_id, cdk_array. */
 392   /* Except for cdk_id, the contained declarator.  For cdk_id, NULL.  */
 393   struct c_declarator *declarator;
 394   union {
 395     /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
 396        declarator.  */
 397     tree id;
 398     /* For functions.  */
 399     struct c_arg_info *arg_info;
 400     /* For arrays.  */
 401     struct {
 402       /* The array dimension, or NULL for [] and [*].  */
 403       tree dimen;
 404       /* The qualifiers inside [].  */
 405       int quals;
 406       /* The attributes (currently ignored) inside [].  */
 407       tree attrs;
 408       /* Whether [static] was used.  */
 409       BOOL_BITFIELD static_p : 1;
 410       /* Whether [*] was used.  */
 411       BOOL_BITFIELD vla_unspec_p : 1;
 412     } array;
 413     /* For pointers, the qualifiers on the pointer type.  */
 414     int pointer_quals;
 415     /* For attributes.  */
 416     tree attrs;
 417   } u;
 418 };
 419
 420 /* A type name.  */
 421 struct c_type_name {
 422   /* The declaration specifiers.  */
 423   struct c_declspecs *specs;
 424   /* The declarator.  */
 425   struct c_declarator *declarator;
 426 };
 427
 428 /* A parameter.  */
 429 struct c_parm {
 430   /* The declaration specifiers, minus any prefix attributes.  */
 431   struct c_declspecs *specs;
 432   /* The attributes.  */
 433   tree attrs;
 434   /* The declarator.  */
 435   struct c_declarator *declarator;
 436 };
 437
 438 /* Used when parsing an enum.  Initialized by start_enum.  */
 439 struct c_enum_contents
 440 {
 441   /* While defining an enum type, this is 1 plus the last enumerator
 442      constant value.  */
 443   tree enum_next_value;
 444
 445   /* Nonzero means that there was overflow computing enum_next_value.  */
 446   int enum_overflow;
 447 };
 448
 449 /* A type of reference to a static identifier in an inline
 450    function.  */
 451 enum c_inline_static_type {
 452   /* Identifier with internal linkage used in function that may be an
 453      inline definition (i.e., file-scope static).  */
 454   csi_internal,
 455   /* Modifiable object with static storage duration defined in
 456      function that may be an inline definition (i.e., local
 457      static).  */
 458   csi_modifiable
 459 };
 460
 461 \f
 462 /* in c-parser.c */
 463 extern void c_parse_init (void);
 464
 465 /* in c-aux-info.c */
 466 extern void gen_aux_info_record (tree, int, int, int);
 467
 468 /* in c-decl.c */
 469 struct c_spot_bindings;
 470 struct c_struct_parse_info;
 471 extern struct obstack parser_obstack;
 472 extern tree c_break_label;
 473 extern tree c_cont_label;
 474
 475 extern bool global_bindings_p (void);
 476 extern void push_scope (void);
 477 extern tree pop_scope (void);
 478 extern void c_bindings_start_stmt_expr (struct c_spot_bindings *);
 479 extern void c_bindings_end_stmt_expr (struct c_spot_bindings *);
 480
 481 extern void record_inline_static (location_t, tree, tree,
 482                                   enum c_inline_static_type);
 483 extern void c_init_decl_processing (void);
 484 extern void c_print_identifier (FILE *, tree, int);
 485 extern int quals_from_declspecs (const struct c_declspecs *);
 486 extern struct c_declarator *build_array_declarator (location_t, tree,
 487                                                     struct c_declspecs *,
 488                                                     bool, bool);
 489 extern tree build_enumerator (location_t, location_t, struct c_enum_contents *,
 490                               tree, tree);
 491 extern tree check_for_loop_decls (location_t, bool);
 492 extern void mark_forward_parm_decls (void);
 493 extern void declare_parm_level (void);
 494 extern void undeclared_variable (location_t, tree);
 495 extern tree lookup_label_for_goto (location_t, tree);
 496 extern tree declare_label (tree);
 497 extern tree define_label (location_t, tree);
 498 extern struct c_spot_bindings *c_get_switch_bindings (void);
 499 extern void c_release_switch_bindings (struct c_spot_bindings *);
 500 extern bool c_check_switch_jump_warnings (struct c_spot_bindings *,
 501                                           location_t, location_t);
 502 extern void finish_decl (tree, location_t, tree, tree, tree);
 503 extern tree finish_enum (tree, tree, tree);
 504 extern void finish_function (void);
 505 extern tree finish_struct (location_t, tree, tree, tree,
 506                            struct c_struct_parse_info *);
 507 extern struct c_arg_info *build_arg_info (void);
 508 extern struct c_arg_info *get_parm_info (bool, tree);
 509 extern tree grokfield (location_t, struct c_declarator *,
 510                        struct c_declspecs *, tree, tree *);
 511 extern tree groktypename (struct c_type_name *, tree *, bool *);
 512 extern tree grokparm (const struct c_parm *, tree *);
 513 extern tree implicitly_declare (location_t, tree);
 514 extern void keep_next_level (void);
 515 extern void pending_xref_error (void);
 516 extern void c_push_function_context (void);
 517 extern void c_pop_function_context (void);
 518 extern void push_parm_decl (const struct c_parm *, tree *);
 519 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
 520                                                         struct c_declarator *);
 521 extern tree c_builtin_function (tree);
 522 extern tree c_builtin_function_ext_scope (tree);
 523 extern void shadow_tag (const struct c_declspecs *);
 524 extern void shadow_tag_warned (const struct c_declspecs *, int);
 525 extern tree start_enum (location_t, struct c_enum_contents *, tree);
 526 extern int  start_function (struct c_declspecs *, struct c_declarator *, tree);
 527 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
 528                         tree);
 529 extern tree start_struct (location_t, enum tree_code, tree,
 530                           struct c_struct_parse_info **);
 531 extern void store_parm_decls (void);
 532 extern void store_parm_decls_from (struct c_arg_info *);
 533 extern void temp_store_parm_decls (tree, tree);
 534 extern void temp_pop_parm_decls (void);
 535 extern tree xref_tag (enum tree_code, tree);
 536 extern struct c_typespec parser_xref_tag (location_t, enum tree_code, tree);
 537 extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
 538                                     struct c_declarator *);
 539 extern struct c_declarator *build_attrs_declarator (tree,
 540                                                     struct c_declarator *);
 541 extern struct c_declarator *build_function_declarator (struct c_arg_info *,
 542                                                        struct c_declarator *);
 543 extern struct c_declarator *build_id_declarator (tree);
 544 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
 545                                                      struct c_declarator *);
 546 extern struct c_declspecs *build_null_declspecs (void);
 547 extern struct c_declspecs *declspecs_add_qual (source_location,
 548                                                struct c_declspecs *, tree);
 549 extern struct c_declspecs *declspecs_add_type (location_t,
 550                                                struct c_declspecs *,
 551                                                struct c_typespec);
 552 extern struct c_declspecs *declspecs_add_scspec (source_location,
 553                                                  struct c_declspecs *, tree);
 554 extern struct c_declspecs *declspecs_add_attrs (source_location,
 555                                                 struct c_declspecs *, tree);
 556 extern struct c_declspecs *declspecs_add_addrspace (source_location,
 557                                                     struct c_declspecs *,
 558                                                     addr_space_t);
 559 extern struct c_declspecs *declspecs_add_alignas (source_location,
 560                                                   struct c_declspecs *, tree);
 561 extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
 562
 563 /* in c-objc-common.c */
 564 extern bool c_objc_common_init (void);
 565 extern bool c_missing_noreturn_ok_p (tree);
 566 extern bool c_warn_unused_global_decl (const_tree);
 567 extern void c_initialize_diagnostics (diagnostic_context *);
 568 extern bool c_vla_unspec_p (tree x, tree fn);
 569
 570 /* in c-typeck.c */
 571 extern int in_alignof;
 572 extern int in_sizeof;
 573 extern int in_typeof;
 574
 575 extern tree c_last_sizeof_arg;
 576
 577 extern struct c_switch *c_switch_stack;
 578
 579 extern tree c_objc_common_truthvalue_conversion (location_t, tree);
 580 extern tree require_complete_type (tree);
 581 extern int same_translation_unit_p (const_tree, const_tree);
 582 extern int comptypes (tree, tree);
 583 extern int comptypes_check_different_types (tree, tree, bool *);
 584 extern bool c_vla_type_p (const_tree);
 585 extern bool c_mark_addressable (tree);
 586 extern void c_incomplete_type_error (const_tree, const_tree);
 587 extern tree c_type_promotes_to (tree);
 588 extern struct c_expr default_function_array_conversion (location_t,
 589                                                         struct c_expr);
 590 extern struct c_expr default_function_array_read_conversion (location_t,
 591                                                              struct c_expr);
 592 extern struct c_expr convert_lvalue_to_rvalue (location_t, struct c_expr,
 593                                                bool, bool);
 594 extern void mark_exp_read (tree);
 595 extern tree composite_type (tree, tree);
 596 extern tree build_component_ref (location_t, tree, tree);
 597 extern tree build_array_ref (location_t, tree, tree);
 598 extern tree build_external_ref (location_t, tree, int, tree *);
 599 extern void pop_maybe_used (bool);
 600 extern struct c_expr c_expr_sizeof_expr (location_t, struct c_expr);
 601 extern struct c_expr c_expr_sizeof_type (location_t, struct c_type_name *);
 602 extern struct c_expr parser_build_unary_op (location_t, enum tree_code,
 603                                             struct c_expr);
 604 extern struct c_expr parser_build_binary_op (location_t,
 605                                              enum tree_code, struct c_expr,
 606                                              struct c_expr);
 607 extern tree build_conditional_expr (location_t, tree, bool, tree, tree,
 608                                     tree, tree);
 609 extern tree build_compound_expr (location_t, tree, tree);
 610 extern tree c_cast_expr (location_t, struct c_type_name *, tree);
 611 extern tree build_c_cast (location_t, tree, tree);
 612 extern void store_init_value (location_t, tree, tree, tree);
 613 extern void maybe_warn_string_init (location_t, tree, struct c_expr);
 614 extern void start_init (tree, tree, int);
 615 extern void finish_init (void);
 616 extern void really_start_incremental_init (tree);
 617 extern void push_init_level (location_t, int, struct obstack *);
 618 extern struct c_expr pop_init_level (location_t, int, struct obstack *);
 619 extern void set_init_index (location_t, tree, tree, struct obstack *);
 620 extern void set_init_label (location_t, tree, struct obstack *);
 621 extern void process_init_element (location_t, struct c_expr, bool,
 622                                   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, bool);
 626 extern void c_finish_case (tree, 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_finish_oacc_parallel (location_t, tree, tree);
 644 extern tree c_finish_oacc_kernels (location_t, tree, tree);
 645 extern tree c_finish_oacc_data (location_t, tree, tree);
 646 extern tree c_begin_omp_parallel (void);
 647 extern tree c_finish_omp_parallel (location_t, tree, tree);
 648 extern tree c_begin_omp_task (void);
 649 extern tree c_finish_omp_task (location_t, tree, tree);
 650 extern void c_finish_omp_cancel (location_t, tree);
 651 extern void c_finish_omp_cancellation_point (location_t, tree);
 652 extern tree c_finish_omp_clauses (tree);
 653 extern tree c_build_va_arg (location_t, tree, tree);
 654 extern tree c_finish_transaction (location_t, tree, int);
 655 extern bool c_tree_equal (tree, tree);
 656 extern tree c_build_function_call_vec (location_t, vec<location_t>, tree,
 657                                        vec<tree, va_gc> *, vec<tree, va_gc> *);
 658
 659 /* Set to 0 at beginning of a function definition, set to 1 if
 660    a return statement that specifies a return value is seen.  */
 661
 662 extern int current_function_returns_value;
 663
 664 /* Set to 0 at beginning of a function definition, set to 1 if
 665    a return statement with no argument is seen.  */
 666
 667 extern int current_function_returns_null;
 668
 669 /* Set to 0 at beginning of a function definition, set to 1 if
 670    a call to a noreturn function is seen.  */
 671
 672 extern int current_function_returns_abnormally;
 673
 674 /* In c-decl.c */
 675
 676 /* Tell the binding oracle what kind of binding we are looking for.  */
 677
 678 enum c_oracle_request
 679 {
 680   C_ORACLE_SYMBOL,
 681   C_ORACLE_TAG,
 682   C_ORACLE_LABEL
 683 };
 684
 685 /* If this is non-NULL, then it is a "binding oracle" which can lazily
 686    create bindings when needed by the C compiler.  The oracle is told
 687    the name and type of the binding to create.  It can call pushdecl
 688    or the like to ensure the binding is visible; or do nothing,
 689    leaving the binding untouched.  c-decl.c takes note of when the
 690    oracle has been called and will not call it again if it fails to
 691    create a given binding.  */
 692
 693 typedef void c_binding_oracle_function (enum c_oracle_request, tree identifier);
 694
 695 extern c_binding_oracle_function *c_binding_oracle;
 696
 697 extern void c_finish_incomplete_decl (tree);
 698 extern tree c_omp_reduction_id (enum tree_code, tree);
 699 extern tree c_omp_reduction_decl (tree);
 700 extern tree c_omp_reduction_lookup (tree, tree);
 701 extern tree c_check_omp_declare_reduction_r (tree *, int *, void *);
 702 extern void c_pushtag (location_t, tree, tree);
 703 extern void c_bind (location_t, tree, bool);
 704
 705 /* In c-errors.c */
 706 extern void pedwarn_c90 (location_t, int opt, const char *, ...)
 707     ATTRIBUTE_GCC_DIAG(3,4);
 708 extern bool pedwarn_c99 (location_t, int opt, const char *, ...)
 709     ATTRIBUTE_GCC_DIAG(3,4);
 710
 711 #endif /* ! GCC_C_TREE_H */