gcc/c/c-tree.h

   1 /* Definitions for C parsing and type checking.
   2    Copyright (C) 1987-2014 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 kind of type specifier.  Note that this information is currently
 136    only used to distinguish tag definitions, tag references and typeof
 137    uses.  */
 138 enum c_typespec_kind {
 139   /* No typespec.  This appears only in struct c_declspec.  */
 140   ctsk_none,
 141   /* A reserved keyword type specifier.  */
 142   ctsk_resword,
 143   /* A reference to a tag, previously declared, such as "struct foo".
 144      This includes where the previous declaration was as a different
 145      kind of tag, in which case this is only valid if shadowing that
 146      tag in an inner scope.  */
 147   ctsk_tagref,
 148   /* A reference to a tag, not previously declared in a visible
 149      scope.  */
 150   ctsk_tagfirstref,
 151   /* A definition of a tag such as "struct foo { int a; }".  */
 152   ctsk_tagdef,
 153   /* A typedef name.  */
 154   ctsk_typedef,
 155   /* An ObjC-specific kind of type specifier.  */
 156   ctsk_objc,
 157   /* A typeof specifier, or _Atomic ( type-name ).  */
 158   ctsk_typeof
 159 };
 160
 161 /* A type specifier: this structure is created in the parser and
 162    passed to declspecs_add_type only.  */
 163 struct c_typespec {
 164   /* What kind of type specifier this is.  */
 165   enum c_typespec_kind kind;
 166   /* Whether the expression has operands suitable for use in constant
 167      expressions.  */
 168   bool expr_const_operands;
 169   /* The specifier itself.  */
 170   tree spec;
 171   /* An expression to be evaluated before the type specifier, in the
 172      case of typeof specifiers, or NULL otherwise or if no such
 173      expression is required for a particular typeof specifier.  In
 174      particular, when typeof is applied to an expression of variably
 175      modified type, that expression must be evaluated in order to
 176      determine array sizes that form part of the type, but the
 177      expression itself (as opposed to the array sizes) forms no part
 178      of the type and so needs to be recorded separately.  */
 179   tree expr;
 180 };
 181
 182 /* A storage class specifier.  */
 183 enum c_storage_class {
 184   csc_none,
 185   csc_auto,
 186   csc_extern,
 187   csc_register,
 188   csc_static,
 189   csc_typedef
 190 };
 191
 192 /* A type specifier keyword "void", "_Bool", "char", "int", "float",
 193    "double", "_Decimal32", "_Decimal64", "_Decimal128", "_Fract", "_Accum",
 194    or none of these.  */
 195 enum c_typespec_keyword {
 196   cts_none,
 197   cts_void,
 198   cts_bool,
 199   cts_char,
 200   cts_int,
 201   cts_float,
 202   cts_int128,
 203   cts_double,
 204   cts_dfloat32,
 205   cts_dfloat64,
 206   cts_dfloat128,
 207   cts_fract,
 208   cts_accum,
 209   cts_auto_type
 210 };
 211
 212 /* This enum lists all the possible declarator specifiers, storage
 213    class or attribute that a user can write.  There is at least one
 214    enumerator per possible declarator specifier in the struct
 215    c_declspecs below.
 216
 217    It is used to index the array of declspec locations in struct
 218    c_declspecs.  */
 219 enum c_declspec_word {
 220   cdw_typespec /* A catch-all for a typespec.  */,
 221   cdw_storage_class  /* A catch-all for a storage class */,
 222   cdw_attributes,
 223   cdw_typedef,
 224   cdw_explicit_signed,
 225   cdw_deprecated,
 226   cdw_default_int,
 227   cdw_long,
 228   cdw_long_long,
 229   cdw_short,
 230   cdw_signed,
 231   cdw_unsigned,
 232   cdw_complex,
 233   cdw_inline,
 234   cdw_noreturn,
 235   cdw_thread,
 236   cdw_const,
 237   cdw_volatile,
 238   cdw_restrict,
 239   cdw_saturating,
 240   cdw_alignas,
 241   cdw_address_space,
 242   cdw_number_of_elements /* This one must always be the last
 243                             enumerator.  */
 244 };
 245
 246 /* A sequence of declaration specifiers in C.  When a new declaration
 247    specifier is added, please update the enum c_declspec_word above
 248    accordingly.  */
 249 struct c_declspecs {
 250   source_location locations[cdw_number_of_elements];
 251   /* The type specified, if a single type specifier such as a struct,
 252      union or enum specifier, typedef name or typeof specifies the
 253      whole type, or NULL_TREE if none or a keyword such as "void" or
 254      "char" is used.  Does not include qualifiers.  */
 255   tree type;
 256   /* Any expression to be evaluated before the type, from a typeof
 257      specifier.  */
 258   tree expr;
 259   /* The attributes from a typedef decl.  */
 260   tree decl_attr;
 261   /* When parsing, the attributes.  Outside the parser, this will be
 262      NULL; attributes (possibly from multiple lists) will be passed
 263      separately.  */
 264   tree attrs;
 265   /* The base-2 log of the greatest alignment required by an _Alignas
 266      specifier, in bytes, or -1 if no such specifiers with nonzero
 267      alignment.  */
 268   int align_log;
 269   /* The storage class specifier, or csc_none if none.  */
 270   enum c_storage_class storage_class;
 271   /* Any type specifier keyword used such as "int", not reflecting
 272      modifiers such as "short", or cts_none if none.  */
 273   ENUM_BITFIELD (c_typespec_keyword) typespec_word : 8;
 274   /* The kind of type specifier if one has been seen, ctsk_none
 275      otherwise.  */
 276   ENUM_BITFIELD (c_typespec_kind) typespec_kind : 3;
 277   /* Whether any expressions in typeof specifiers may appear in
 278      constant expressions.  */
 279   BOOL_BITFIELD expr_const_operands : 1;
 280   /* Whether any declaration specifiers have been seen at all.  */
 281   BOOL_BITFIELD declspecs_seen_p : 1;
 282   /* Whether something other than a storage class specifier or
 283      attribute has been seen.  This is used to warn for the
 284      obsolescent usage of storage class specifiers other than at the
 285      start of the list.  (Doing this properly would require function
 286      specifiers to be handled separately from storage class
 287      specifiers.)  */
 288   BOOL_BITFIELD non_sc_seen_p : 1;
 289   /* Whether the type is specified by a typedef or typeof name.  */
 290   BOOL_BITFIELD typedef_p : 1;
 291   /* Whether the type is explicitly "signed" or specified by a typedef
 292      whose type is explicitly "signed".  */
 293   BOOL_BITFIELD explicit_signed_p : 1;
 294   /* Whether the specifiers include a deprecated typedef.  */
 295   BOOL_BITFIELD deprecated_p : 1;
 296   /* Whether the type defaulted to "int" because there were no type
 297      specifiers.  */
 298   BOOL_BITFIELD default_int_p : 1;
 299   /* Whether "long" was specified.  */
 300   BOOL_BITFIELD long_p : 1;
 301   /* Whether "long" was specified more than once.  */
 302   BOOL_BITFIELD long_long_p : 1;
 303   /* Whether "short" was specified.  */
 304   BOOL_BITFIELD short_p : 1;
 305   /* Whether "signed" was specified.  */
 306   BOOL_BITFIELD signed_p : 1;
 307   /* Whether "unsigned" was specified.  */
 308   BOOL_BITFIELD unsigned_p : 1;
 309   /* Whether "complex" was specified.  */
 310   BOOL_BITFIELD complex_p : 1;
 311   /* Whether "inline" was specified.  */
 312   BOOL_BITFIELD inline_p : 1;
 313   /* Whether "_Noreturn" was speciied.  */
 314   BOOL_BITFIELD noreturn_p : 1;
 315   /* Whether "__thread" or "_Thread_local" was specified.  */
 316   BOOL_BITFIELD thread_p : 1;
 317   /* Whether "__thread" rather than "_Thread_local" was specified.  */
 318   BOOL_BITFIELD thread_gnu_p : 1;
 319   /* Whether "const" was specified.  */
 320   BOOL_BITFIELD const_p : 1;
 321   /* Whether "volatile" was specified.  */
 322   BOOL_BITFIELD volatile_p : 1;
 323   /* Whether "restrict" was specified.  */
 324   BOOL_BITFIELD restrict_p : 1;
 325   /* Whether "_Atomic" was specified.  */
 326   BOOL_BITFIELD atomic_p : 1;
 327   /* Whether "_Sat" was specified.  */
 328   BOOL_BITFIELD saturating_p : 1;
 329   /* Whether any alignment specifier (even with zero alignment) was
 330      specified.  */
 331   BOOL_BITFIELD alignas_p : 1;
 332   /* The address space that the declaration belongs to.  */
 333   addr_space_t address_space;
 334 };
 335
 336 /* The various kinds of declarators in C.  */
 337 enum c_declarator_kind {
 338   /* An identifier.  */
 339   cdk_id,
 340   /* A function.  */
 341   cdk_function,
 342   /* An array.  */
 343   cdk_array,
 344   /* A pointer.  */
 345   cdk_pointer,
 346   /* Parenthesized declarator with nested attributes.  */
 347   cdk_attrs
 348 };
 349
 350 typedef struct c_arg_tag_d {
 351   /* The argument name.  */
 352   tree id;
 353   /* The type of the argument.  */
 354   tree type;
 355 } c_arg_tag;
 356
 357
 358 /* Information about the parameters in a function declarator.  */
 359 struct c_arg_info {
 360   /* A list of parameter decls.  */
 361   tree parms;
 362   /* A list of structure, union and enum tags defined.  */
 363   vec<c_arg_tag, va_gc> *tags;
 364   /* A list of argument types to go in the FUNCTION_TYPE.  */
 365   tree types;
 366   /* A list of non-parameter decls (notably enumeration constants)
 367      defined with the parameters.  */
 368   tree others;
 369   /* A compound expression of VLA sizes from the parameters, or NULL.
 370      In a function definition, these are used to ensure that
 371      side-effects in sizes of arrays converted to pointers (such as a
 372      parameter int i[n++]) take place; otherwise, they are
 373      ignored.  */
 374   tree pending_sizes;
 375   /* True when these arguments had [*].  */
 376   BOOL_BITFIELD had_vla_unspec : 1;
 377 };
 378
 379 /* A declarator.  */
 380 struct c_declarator {
 381   /* The kind of declarator.  */
 382   enum c_declarator_kind kind;
 383   location_t id_loc; /* Currently only set for cdk_id, cdk_array. */
 384   /* Except for cdk_id, the contained declarator.  For cdk_id, NULL.  */
 385   struct c_declarator *declarator;
 386   union {
 387     /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
 388        declarator.  */
 389     tree id;
 390     /* For functions.  */
 391     struct c_arg_info *arg_info;
 392     /* For arrays.  */
 393     struct {
 394       /* The array dimension, or NULL for [] and [*].  */
 395       tree dimen;
 396       /* The qualifiers inside [].  */
 397       int quals;
 398       /* The attributes (currently ignored) inside [].  */
 399       tree attrs;
 400       /* Whether [static] was used.  */
 401       BOOL_BITFIELD static_p : 1;
 402       /* Whether [*] was used.  */
 403       BOOL_BITFIELD vla_unspec_p : 1;
 404     } array;
 405     /* For pointers, the qualifiers on the pointer type.  */
 406     int pointer_quals;
 407     /* For attributes.  */
 408     tree attrs;
 409   } u;
 410 };
 411
 412 /* A type name.  */
 413 struct c_type_name {
 414   /* The declaration specifiers.  */
 415   struct c_declspecs *specs;
 416   /* The declarator.  */
 417   struct c_declarator *declarator;
 418 };
 419
 420 /* A parameter.  */
 421 struct c_parm {
 422   /* The declaration specifiers, minus any prefix attributes.  */
 423   struct c_declspecs *specs;
 424   /* The attributes.  */
 425   tree attrs;
 426   /* The declarator.  */
 427   struct c_declarator *declarator;
 428 };
 429
 430 /* Used when parsing an enum.  Initialized by start_enum.  */
 431 struct c_enum_contents
 432 {
 433   /* While defining an enum type, this is 1 plus the last enumerator
 434      constant value.  */
 435   tree enum_next_value;
 436
 437   /* Nonzero means that there was overflow computing enum_next_value.  */
 438   int enum_overflow;
 439 };
 440
 441 /* A type of reference to a static identifier in an inline
 442    function.  */
 443 enum c_inline_static_type {
 444   /* Identifier with internal linkage used in function that may be an
 445      inline definition (i.e., file-scope static).  */
 446   csi_internal,
 447   /* Modifiable object with static storage duration defined in
 448      function that may be an inline definition (i.e., local
 449      static).  */
 450   csi_modifiable
 451 };
 452
 453 \f
 454 /* in c-parser.c */
 455 extern void c_parse_init (void);
 456
 457 /* in c-aux-info.c */
 458 extern void gen_aux_info_record (tree, int, int, int);
 459
 460 /* in c-decl.c */
 461 struct c_spot_bindings;
 462 struct c_struct_parse_info;
 463 extern struct obstack parser_obstack;
 464 extern tree c_break_label;
 465 extern tree c_cont_label;
 466
 467 extern bool global_bindings_p (void);
 468 extern void push_scope (void);
 469 extern tree pop_scope (void);
 470 extern void c_bindings_start_stmt_expr (struct c_spot_bindings *);
 471 extern void c_bindings_end_stmt_expr (struct c_spot_bindings *);
 472
 473 extern void record_inline_static (location_t, tree, tree,
 474                                   enum c_inline_static_type);
 475 extern void c_init_decl_processing (void);
 476 extern void c_print_identifier (FILE *, tree, int);
 477 extern int quals_from_declspecs (const struct c_declspecs *);
 478 extern struct c_declarator *build_array_declarator (location_t, tree,
 479                                                     struct c_declspecs *,
 480                                                     bool, bool);
 481 extern tree build_enumerator (location_t, location_t, struct c_enum_contents *,
 482                               tree, tree);
 483 extern tree check_for_loop_decls (location_t, bool);
 484 extern void mark_forward_parm_decls (void);
 485 extern void declare_parm_level (void);
 486 extern void undeclared_variable (location_t, tree);
 487 extern tree lookup_label_for_goto (location_t, tree);
 488 extern tree declare_label (tree);
 489 extern tree define_label (location_t, tree);
 490 extern struct c_spot_bindings *c_get_switch_bindings (void);
 491 extern void c_release_switch_bindings (struct c_spot_bindings *);
 492 extern bool c_check_switch_jump_warnings (struct c_spot_bindings *,
 493                                           location_t, location_t);
 494 extern void finish_decl (tree, location_t, tree, tree, tree);
 495 extern tree finish_enum (tree, tree, tree);
 496 extern void finish_function (void);
 497 extern tree finish_struct (location_t, tree, tree, tree,
 498                            struct c_struct_parse_info *);
 499 extern struct c_arg_info *build_arg_info (void);
 500 extern struct c_arg_info *get_parm_info (bool, tree);
 501 extern tree grokfield (location_t, struct c_declarator *,
 502                        struct c_declspecs *, tree, tree *);
 503 extern tree groktypename (struct c_type_name *, tree *, bool *);
 504 extern tree grokparm (const struct c_parm *, tree *);
 505 extern tree implicitly_declare (location_t, tree);
 506 extern void keep_next_level (void);
 507 extern void pending_xref_error (void);
 508 extern void c_push_function_context (void);
 509 extern void c_pop_function_context (void);
 510 extern void push_parm_decl (const struct c_parm *, tree *);
 511 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
 512                                                         struct c_declarator *);
 513 extern tree c_builtin_function (tree);
 514 extern tree c_builtin_function_ext_scope (tree);
 515 extern void shadow_tag (const struct c_declspecs *);
 516 extern void shadow_tag_warned (const struct c_declspecs *, int);
 517 extern tree start_enum (location_t, struct c_enum_contents *, tree);
 518 extern int  start_function (struct c_declspecs *, struct c_declarator *, tree);
 519 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
 520                         tree);
 521 extern tree start_struct (location_t, enum tree_code, tree,
 522                           struct c_struct_parse_info **);
 523 extern void store_parm_decls (void);
 524 extern void store_parm_decls_from (struct c_arg_info *);
 525 extern void temp_store_parm_decls (tree, tree);
 526 extern void temp_pop_parm_decls (void);
 527 extern tree xref_tag (enum tree_code, tree);
 528 extern struct c_typespec parser_xref_tag (location_t, enum tree_code, tree);
 529 extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
 530                                     struct c_declarator *);
 531 extern struct c_declarator *build_attrs_declarator (tree,
 532                                                     struct c_declarator *);
 533 extern struct c_declarator *build_function_declarator (struct c_arg_info *,
 534                                                        struct c_declarator *);
 535 extern struct c_declarator *build_id_declarator (tree);
 536 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
 537                                                      struct c_declarator *);
 538 extern struct c_declspecs *build_null_declspecs (void);
 539 extern struct c_declspecs *declspecs_add_qual (source_location,
 540                                                struct c_declspecs *, tree);
 541 extern struct c_declspecs *declspecs_add_type (location_t,
 542                                                struct c_declspecs *,
 543                                                struct c_typespec);
 544 extern struct c_declspecs *declspecs_add_scspec (source_location,
 545                                                  struct c_declspecs *, tree);
 546 extern struct c_declspecs *declspecs_add_attrs (source_location,
 547                                                 struct c_declspecs *, tree);
 548 extern struct c_declspecs *declspecs_add_addrspace (source_location,
 549                                                     struct c_declspecs *,
 550                                                     addr_space_t);
 551 extern struct c_declspecs *declspecs_add_alignas (source_location,
 552                                                   struct c_declspecs *, tree);
 553 extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
 554
 555 /* in c-objc-common.c */
 556 extern bool c_objc_common_init (void);
 557 extern bool c_missing_noreturn_ok_p (tree);
 558 extern bool c_warn_unused_global_decl (const_tree);
 559 extern void c_initialize_diagnostics (diagnostic_context *);
 560 extern bool c_vla_unspec_p (tree x, tree fn);
 561
 562 /* in c-typeck.c */
 563 extern int in_alignof;
 564 extern int in_sizeof;
 565 extern int in_typeof;
 566
 567 extern tree c_last_sizeof_arg;
 568
 569 extern struct c_switch *c_switch_stack;
 570
 571 extern tree c_objc_common_truthvalue_conversion (location_t, tree);
 572 extern tree require_complete_type (tree);
 573 extern int same_translation_unit_p (const_tree, const_tree);
 574 extern int comptypes (tree, tree);
 575 extern int comptypes_check_different_types (tree, tree, bool *);
 576 extern bool c_vla_type_p (const_tree);
 577 extern bool c_mark_addressable (tree);
 578 extern void c_incomplete_type_error (const_tree, const_tree);
 579 extern tree c_type_promotes_to (tree);
 580 extern struct c_expr default_function_array_conversion (location_t,
 581                                                         struct c_expr);
 582 extern struct c_expr default_function_array_read_conversion (location_t,
 583                                                              struct c_expr);
 584 extern struct c_expr convert_lvalue_to_rvalue (location_t, struct c_expr,
 585                                                bool, bool);
 586 extern void mark_exp_read (tree);
 587 extern tree composite_type (tree, tree);
 588 extern tree build_component_ref (location_t, tree, tree);
 589 extern tree build_array_ref (location_t, tree, tree);
 590 extern tree build_external_ref (location_t, tree, int, tree *);
 591 extern void pop_maybe_used (bool);
 592 extern struct c_expr c_expr_sizeof_expr (location_t, struct c_expr);
 593 extern struct c_expr c_expr_sizeof_type (location_t, struct c_type_name *);
 594 extern struct c_expr parser_build_unary_op (location_t, enum tree_code,
 595                                             struct c_expr);
 596 extern struct c_expr parser_build_binary_op (location_t,
 597                                              enum tree_code, struct c_expr,
 598                                              struct c_expr);
 599 extern tree build_conditional_expr (location_t, tree, bool, tree, tree,
 600                                     tree, tree);
 601 extern tree build_compound_expr (location_t, tree, tree);
 602 extern tree c_cast_expr (location_t, struct c_type_name *, tree);
 603 extern tree build_c_cast (location_t, tree, tree);
 604 extern void store_init_value (location_t, tree, tree, tree);
 605 extern void error_init (const char *);
 606 extern void pedwarn_init (location_t, int opt, const char *);
 607 extern void maybe_warn_string_init (tree, struct c_expr);
 608 extern void start_init (tree, tree, int);
 609 extern void finish_init (void);
 610 extern void really_start_incremental_init (tree);
 611 extern void push_init_level (int, struct obstack *);
 612 extern struct c_expr pop_init_level (int, struct obstack *);
 613 extern void set_init_index (tree, tree, struct obstack *);
 614 extern void set_init_label (tree, struct obstack *);
 615 extern void process_init_element (struct c_expr, bool, struct obstack *);
 616 extern tree build_compound_literal (location_t, tree, tree, bool);
 617 extern void check_compound_literal_type (location_t, struct c_type_name *);
 618 extern tree c_start_case (location_t, location_t, tree);
 619 extern void c_finish_case (tree);
 620 extern tree build_asm_expr (location_t, tree, tree, tree, tree, tree, bool);
 621 extern tree build_asm_stmt (tree, tree);
 622 extern int c_types_compatible_p (tree, tree);
 623 extern tree c_begin_compound_stmt (bool);
 624 extern tree c_end_compound_stmt (location_t, tree, bool);
 625 extern void c_finish_if_stmt (location_t, tree, tree, tree, bool);
 626 extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, bool);
 627 extern tree c_begin_stmt_expr (void);
 628 extern tree c_finish_stmt_expr (location_t, tree);
 629 extern tree c_process_expr_stmt (location_t, tree);
 630 extern tree c_finish_expr_stmt (location_t, tree);
 631 extern tree c_finish_return (location_t, tree, tree);
 632 extern tree c_finish_bc_stmt (location_t, tree *, bool);
 633 extern tree c_finish_goto_label (location_t, tree);
 634 extern tree c_finish_goto_ptr (location_t, tree);
 635 extern tree c_expr_to_decl (tree, bool *, bool *);
 636 extern tree c_begin_omp_parallel (void);
 637 extern tree c_finish_omp_parallel (location_t, tree, tree);
 638 extern tree c_begin_omp_task (void);
 639 extern tree c_finish_omp_task (location_t, tree, tree);
 640 extern void c_finish_omp_cancel (location_t, tree);
 641 extern void c_finish_omp_cancellation_point (location_t, tree);
 642 extern tree c_finish_omp_clauses (tree);
 643 extern tree c_build_va_arg (location_t, tree, tree);
 644 extern tree c_finish_transaction (location_t, tree, int);
 645 extern bool c_tree_equal (tree, tree);
 646 extern tree c_build_function_call_vec (location_t, vec<location_t>, tree,
 647                                        vec<tree, va_gc> *, vec<tree, va_gc> *);
 648
 649 /* Set to 0 at beginning of a function definition, set to 1 if
 650    a return statement that specifies a return value is seen.  */
 651
 652 extern int current_function_returns_value;
 653
 654 /* Set to 0 at beginning of a function definition, set to 1 if
 655    a return statement with no argument is seen.  */
 656
 657 extern int current_function_returns_null;
 658
 659 /* Set to 0 at beginning of a function definition, set to 1 if
 660    a call to a noreturn function is seen.  */
 661
 662 extern int current_function_returns_abnormally;
 663
 664 /* Mode used to build pointers (VOIDmode means ptr_mode).  */
 665
 666 extern enum machine_mode c_default_pointer_mode;
 667
 668 /* In c-decl.c */
 669 extern void c_finish_incomplete_decl (tree);
 670 extern void c_write_global_declarations (void);
 671 extern tree c_omp_reduction_id (enum tree_code, tree);
 672 extern tree c_omp_reduction_decl (tree);
 673 extern tree c_omp_reduction_lookup (tree, tree);
 674 extern tree c_check_omp_declare_reduction_r (tree *, int *, void *);
 675
 676 /* In c-errors.c */
 677 extern void pedwarn_c90 (location_t, int opt, const char *, ...) ATTRIBUTE_GCC_DIAG(3,4);
 678 extern void pedwarn_c99 (location_t, int opt, const char *, ...) ATTRIBUTE_GCC_DIAG(3,4);
 679
 680 #endif /* ! GCC_C_TREE_H */