gcc/c-tree.h

   1 /* Definitions for C parsing and type checking.
   2    Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998,
   3    1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009
   4    Free Software Foundation, Inc.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 3, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 #ifndef GCC_C_TREE_H
  23 #define GCC_C_TREE_H
  24
  25 #include "c-common.h"
  26 #include "toplev.h"
  27 #include "diagnostic.h"
  28
  29 /* struct lang_identifier is private to c-decl.c, but langhooks.c needs to
  30    know how big it is.  This is sanity-checked in c-decl.c.  */
  31 #define C_SIZEOF_STRUCT_LANG_IDENTIFIER \
  32   (sizeof (struct c_common_identifier) + 3 * sizeof (void *))
  33
  34 /* Language-specific declaration information.  */
  35
  36 struct GTY(()) lang_decl {
  37   char dummy;
  38 };
  39
  40 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only.  */
  41 #define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1 (TYPE)
  42
  43 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile.  */
  44 #define C_TYPE_FIELDS_VOLATILE(TYPE) TREE_LANG_FLAG_2 (TYPE)
  45
  46 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
  47    nonzero if the definition of the type has already started.  */
  48 #define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE)
  49
  50 /* In an incomplete RECORD_TYPE or UNION_TYPE, a list of variable
  51    declarations whose type would be completed by completing that type.  */
  52 #define C_TYPE_INCOMPLETE_VARS(TYPE) TYPE_VFIELD (TYPE)
  53
  54 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
  55    keyword.  C_RID_CODE (node) is then the RID_* value of the keyword,
  56    and C_RID_YYCODE is the token number wanted by Yacc.  */
  57 #define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
  58
  59 struct GTY(()) lang_type {
  60   /* In a RECORD_TYPE, a sorted array of the fields of the type.  */
  61   struct sorted_fields_type * GTY ((reorder ("resort_sorted_fields"))) s;
  62   /* In an ENUMERAL_TYPE, the min and max values.  */
  63   tree enum_min;
  64   tree enum_max;
  65   /* In a RECORD_TYPE, information specific to Objective-C, such
  66      as a list of adopted protocols or a pointer to a corresponding
  67      @interface.  See objc/objc-act.h for details.  */
  68   tree objc_info;
  69 };
  70
  71 /* Record whether a type or decl was written with nonconstant size.
  72    Note that TYPE_SIZE may have simplified to a constant.  */
  73 #define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
  74 #define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
  75
  76 /* Record whether a type is defined inside a struct or union type.
  77    This is used for -Wc++-compat. */
  78 #define C_TYPE_DEFINED_IN_STRUCT(TYPE) TYPE_LANG_FLAG_2 (TYPE)
  79
  80 /* Record whether a typedef for type `int' was actually `signed int'.  */
  81 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
  82
  83 /* For a FUNCTION_DECL, nonzero if it was defined without an explicit
  84    return type.  */
  85 #define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP)
  86
  87 /* For a FUNCTION_DECL, nonzero if it was an implicit declaration.  */
  88 #define C_DECL_IMPLICIT(EXP) DECL_LANG_FLAG_2 (EXP)
  89
  90 /* For FUNCTION_DECLs, evaluates true if the decl is built-in but has
  91    been declared.  */
  92 #define C_DECL_DECLARED_BUILTIN(EXP)            \
  93   DECL_LANG_FLAG_3 (FUNCTION_DECL_CHECK (EXP))
  94
  95 /* For FUNCTION_DECLs, evaluates true if the decl is built-in, has a
  96    built-in prototype and does not have a non-built-in prototype.  */
  97 #define C_DECL_BUILTIN_PROTOTYPE(EXP)           \
  98   DECL_LANG_FLAG_6 (FUNCTION_DECL_CHECK (EXP))
  99
 100 /* Record whether a decl was declared register.  This is strictly a
 101    front-end flag, whereas DECL_REGISTER is used for code generation;
 102    they may differ for structures with volatile fields.  */
 103 #define C_DECL_REGISTER(EXP) DECL_LANG_FLAG_4 (EXP)
 104
 105 /* Record whether a decl was used in an expression anywhere except an
 106    unevaluated operand of sizeof / typeof / alignof.  This is only
 107    used for functions declared static but not defined, though outside
 108    sizeof and typeof it is set for other function decls as well.  */
 109 #define C_DECL_USED(EXP) DECL_LANG_FLAG_5 (FUNCTION_DECL_CHECK (EXP))
 110
 111 /* Record whether a label was defined in a statement expression which
 112    has finished and so can no longer be jumped to.  */
 113 #define C_DECL_UNJUMPABLE_STMT_EXPR(EXP)        \
 114   DECL_LANG_FLAG_6 (LABEL_DECL_CHECK (EXP))
 115
 116 /* Record whether a label was the subject of a goto from outside the
 117    current level of statement expression nesting and so cannot be
 118    defined right now.  */
 119 #define C_DECL_UNDEFINABLE_STMT_EXPR(EXP)       \
 120   DECL_LANG_FLAG_7 (LABEL_DECL_CHECK (EXP))
 121
 122 /* Record whether a label was defined in the scope of an identifier
 123    with variably modified type which has finished and so can no longer
 124    be jumped to.  */
 125 #define C_DECL_UNJUMPABLE_VM(EXP)       \
 126   DECL_LANG_FLAG_3 (LABEL_DECL_CHECK (EXP))
 127
 128 /* Record whether a label was the subject of a goto from outside the
 129    current level of scopes of identifiers with variably modified type
 130    and so cannot be defined right now.  */
 131 #define C_DECL_UNDEFINABLE_VM(EXP)      \
 132   DECL_LANG_FLAG_5 (LABEL_DECL_CHECK (EXP))
 133
 134 /* Record whether a variable has been declared threadprivate by
 135    #pragma omp threadprivate.  */
 136 #define C_DECL_THREADPRIVATE_P(DECL) DECL_LANG_FLAG_3 (VAR_DECL_CHECK (DECL))
 137
 138 /* Nonzero for a decl which either doesn't exist or isn't a prototype.
 139    N.B. Could be simplified if all built-in decls had complete prototypes
 140    (but this is presently difficult because some of them need FILE*).  */
 141 #define C_DECL_ISNT_PROTOTYPE(EXP)                      \
 142        (EXP == 0                                        \
 143         || (TYPE_ARG_TYPES (TREE_TYPE (EXP)) == 0       \
 144             && !DECL_BUILT_IN (EXP)))
 145
 146 /* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
 147    TYPE_ARG_TYPES for functions with prototypes, but created for functions
 148    without prototypes.  */
 149 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_LANG_SLOT_1 (NODE)
 150
 151 /* For a CONSTRUCTOR, whether some initializer contains a
 152    subexpression meaning it is not a constant expression.  */
 153 #define CONSTRUCTOR_NON_CONST(EXPR) TREE_LANG_FLAG_1 (CONSTRUCTOR_CHECK (EXPR))
 154
 155 /* Record parser information about an expression that is irrelevant
 156    for code generation alongside a tree representing its value.  */
 157 struct c_expr
 158 {
 159   /* The value of the expression.  */
 160   tree value;
 161   /* Record the original unary/binary operator of an expression, which may
 162      have been changed by fold, STRING_CST for unparenthesized string
 163      constants, C_MAYBE_CONST_EXPR for __builtin_constant_p calls
 164      (even if parenthesized), for subexpressions, and for non-constant
 165      initializers, or ERROR_MARK for other expressions (including
 166      parenthesized expressions).  */
 167   enum tree_code original_code;
 168   /* If not NULL, the original type of an expression.  This will
 169      differ from the type of the value field for an enum constant.
 170      The type of an enum constant is a plain integer type, but this
 171      field will be the enum type.  */
 172   tree original_type;
 173 };
 174
 175 /* A kind of type specifier.  Note that this information is currently
 176    only used to distinguish tag definitions, tag references and typeof
 177    uses.  */
 178 enum c_typespec_kind {
 179   /* A reserved keyword type specifier.  */
 180   ctsk_resword,
 181   /* A reference to a tag, previously declared, such as "struct foo".
 182      This includes where the previous declaration was as a different
 183      kind of tag, in which case this is only valid if shadowing that
 184      tag in an inner scope.  */
 185   ctsk_tagref,
 186   /* A reference to a tag, not previously declared in a visible
 187      scope.  */
 188   ctsk_tagfirstref,
 189   /* A definition of a tag such as "struct foo { int a; }".  */
 190   ctsk_tagdef,
 191   /* A typedef name.  */
 192   ctsk_typedef,
 193   /* An ObjC-specific kind of type specifier.  */
 194   ctsk_objc,
 195   /* A typeof specifier.  */
 196   ctsk_typeof
 197 };
 198
 199 /* A type specifier: this structure is created in the parser and
 200    passed to declspecs_add_type only.  */
 201 struct c_typespec {
 202   /* What kind of type specifier this is.  */
 203   enum c_typespec_kind kind;
 204   /* The specifier itself.  */
 205   tree spec;
 206   /* An expression to be evaluated before the type specifier, in the
 207      case of typeof specifiers, or NULL otherwise or if no such
 208      expression is required for a particular typeof specifier.  In
 209      particular, when typeof is applied to an expression of variably
 210      modified type, that expression must be evaluated in order to
 211      determine array sizes that form part of the type, but the
 212      expression itself (as opposed to the array sizes) forms no part
 213      of the type and so needs to be recorded separately.  */
 214   tree expr;
 215   /* Whether the expression has operands suitable for use in constant
 216      expressions.  */
 217   bool expr_const_operands;
 218 };
 219
 220 /* A storage class specifier.  */
 221 enum c_storage_class {
 222   csc_none,
 223   csc_auto,
 224   csc_extern,
 225   csc_register,
 226   csc_static,
 227   csc_typedef
 228 };
 229
 230 /* A type specifier keyword "void", "_Bool", "char", "int", "float",
 231    "double", "_Decimal32", "_Decimal64", "_Decimal128", "_Fract", "_Accum",
 232    or none of these.  */
 233 enum c_typespec_keyword {
 234   cts_none,
 235   cts_void,
 236   cts_bool,
 237   cts_char,
 238   cts_int,
 239   cts_float,
 240   cts_double,
 241   cts_dfloat32,
 242   cts_dfloat64,
 243   cts_dfloat128,
 244   cts_fract,
 245   cts_accum
 246 };
 247
 248 /* A sequence of declaration specifiers in C.  */
 249 struct c_declspecs {
 250   /* The type specified, if a single type specifier such as a struct,
 251      union or enum specifier, typedef name or typeof specifies the
 252      whole type, or NULL_TREE if none or a keyword such as "void" or
 253      "char" is used.  Does not include qualifiers.  */
 254   tree type;
 255   /* Any expression to be evaluated before the type, from a typeof
 256      specifier.  */
 257   tree expr;
 258   /* The attributes from a typedef decl.  */
 259   tree decl_attr;
 260   /* When parsing, the attributes.  Outside the parser, this will be
 261      NULL; attributes (possibly from multiple lists) will be passed
 262      separately.  */
 263   tree attrs;
 264   /* Any type specifier keyword used such as "int", not reflecting
 265      modifiers such as "short", or cts_none if none.  */
 266   enum c_typespec_keyword typespec_word;
 267   /* The storage class specifier, or csc_none if none.  */
 268   enum c_storage_class storage_class;
 269   /* Whether any expressions in typeof specifiers may appear in
 270      constant expressions.  */
 271   BOOL_BITFIELD expr_const_operands : 1;
 272   /* Whether any declaration specifiers have been seen at all.  */
 273   BOOL_BITFIELD declspecs_seen_p : 1;
 274   /* Whether a type specifier has been seen.  */
 275   BOOL_BITFIELD type_seen_p : 1;
 276   /* Whether something other than a storage class specifier or
 277      attribute has been seen.  This is used to warn for the
 278      obsolescent usage of storage class specifiers other than at the
 279      start of the list.  (Doing this properly would require function
 280      specifiers to be handled separately from storage class
 281      specifiers.)  */
 282   BOOL_BITFIELD non_sc_seen_p : 1;
 283   /* Whether the type is specified by a typedef or typeof name.  */
 284   BOOL_BITFIELD typedef_p : 1;
 285   /* Whether a struct, union or enum type either had its content
 286      defined by a type specifier in the list or was the first visible
 287      declaration of its tag.  */
 288   BOOL_BITFIELD tag_defined_p : 1;
 289   /* Whether the type is explicitly "signed" or specified by a typedef
 290      whose type is explicitly "signed".  */
 291   BOOL_BITFIELD explicit_signed_p : 1;
 292   /* Whether the specifiers include a deprecated typedef.  */
 293   BOOL_BITFIELD deprecated_p : 1;
 294   /* Whether the type defaulted to "int" because there were no type
 295      specifiers.  */
 296   BOOL_BITFIELD default_int_p;
 297   /* Whether "long" was specified.  */
 298   BOOL_BITFIELD long_p : 1;
 299   /* Whether "long" was specified more than once.  */
 300   BOOL_BITFIELD long_long_p : 1;
 301   /* Whether "short" was specified.  */
 302   BOOL_BITFIELD short_p : 1;
 303   /* Whether "signed" was specified.  */
 304   BOOL_BITFIELD signed_p : 1;
 305   /* Whether "unsigned" was specified.  */
 306   BOOL_BITFIELD unsigned_p : 1;
 307   /* Whether "complex" was specified.  */
 308   BOOL_BITFIELD complex_p : 1;
 309   /* Whether "inline" was specified.  */
 310   BOOL_BITFIELD inline_p : 1;
 311   /* Whether "__thread" was specified.  */
 312   BOOL_BITFIELD thread_p : 1;
 313   /* Whether "const" was specified.  */
 314   BOOL_BITFIELD const_p : 1;
 315   /* Whether "volatile" was specified.  */
 316   BOOL_BITFIELD volatile_p : 1;
 317   /* Whether "restrict" was specified.  */
 318   BOOL_BITFIELD restrict_p : 1;
 319   /* Whether "_Sat" was specified.  */
 320   BOOL_BITFIELD saturating_p : 1;
 321 };
 322
 323 /* The various kinds of declarators in C.  */
 324 enum c_declarator_kind {
 325   /* An identifier.  */
 326   cdk_id,
 327   /* A function.  */
 328   cdk_function,
 329   /* An array.  */
 330   cdk_array,
 331   /* A pointer.  */
 332   cdk_pointer,
 333   /* Parenthesized declarator with nested attributes.  */
 334   cdk_attrs
 335 };
 336
 337 /* Information about the parameters in a function declarator.  */
 338 struct c_arg_info {
 339   /* A list of parameter decls.  */
 340   tree parms;
 341   /* A list of structure, union and enum tags defined.  */
 342   tree tags;
 343   /* A list of argument types to go in the FUNCTION_TYPE.  */
 344   tree types;
 345   /* A list of non-parameter decls (notably enumeration constants)
 346      defined with the parameters.  */
 347   tree others;
 348   /* A list of VLA sizes from the parameters.  In a function
 349      definition, these are used to ensure that side-effects in sizes
 350      of arrays converted to pointers (such as a parameter int i[n++])
 351      take place; otherwise, they are ignored.  */
 352   tree pending_sizes;
 353   /* True when these arguments had [*].  */
 354   BOOL_BITFIELD had_vla_unspec : 1;
 355 };
 356
 357 /* A declarator.  */
 358 struct c_declarator {
 359   /* The kind of declarator.  */
 360   enum c_declarator_kind kind;
 361   /* Except for cdk_id, the contained declarator.  For cdk_id, NULL.  */
 362   struct c_declarator *declarator;
 363   location_t id_loc; /* Currently only set for cdk_id. */
 364   union {
 365     /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
 366        declarator.  */
 367     tree id;
 368     /* For functions.  */
 369     struct c_arg_info *arg_info;
 370     /* For arrays.  */
 371     struct {
 372       /* The array dimension, or NULL for [] and [*].  */
 373       tree dimen;
 374       /* The qualifiers inside [].  */
 375       int quals;
 376       /* The attributes (currently ignored) inside [].  */
 377       tree attrs;
 378       /* Whether [static] was used.  */
 379       BOOL_BITFIELD static_p : 1;
 380       /* Whether [*] was used.  */
 381       BOOL_BITFIELD vla_unspec_p : 1;
 382     } array;
 383     /* For pointers, the qualifiers on the pointer type.  */
 384     int pointer_quals;
 385     /* For attributes.  */
 386     tree attrs;
 387   } u;
 388 };
 389
 390 /* A type name.  */
 391 struct c_type_name {
 392   /* The declaration specifiers.  */
 393   struct c_declspecs *specs;
 394   /* The declarator.  */
 395   struct c_declarator *declarator;
 396 };
 397
 398 /* A parameter.  */
 399 struct c_parm {
 400   /* The declaration specifiers, minus any prefix attributes.  */
 401   struct c_declspecs *specs;
 402   /* The attributes.  */
 403   tree attrs;
 404   /* The declarator.  */
 405   struct c_declarator *declarator;
 406 };
 407
 408 /* Save and restore the variables in this file and elsewhere
 409    that keep track of the progress of compilation of the current function.
 410    Used for nested functions.  */
 411
 412 struct GTY(()) language_function {
 413   struct c_language_function base;
 414   tree x_break_label;
 415   tree x_cont_label;
 416   struct c_switch * GTY((skip)) x_switch_stack;
 417   struct c_arg_info * GTY((skip)) arg_info;
 418   int returns_value;
 419   int returns_null;
 420   int returns_abnormally;
 421   int warn_about_return_type;
 422 };
 423
 424 /* Save lists of labels used or defined in particular contexts.
 425    Allocated on the parser obstack.  */
 426
 427 struct c_label_list
 428 {
 429   /* The label at the head of the list.  */
 430   tree label;
 431   /* The rest of the list.  */
 432   struct c_label_list *next;
 433 };
 434
 435 /* Statement expression context.  */
 436
 437 struct c_label_context_se
 438 {
 439   /* The labels defined at this level of nesting.  */
 440   struct c_label_list *labels_def;
 441   /* The labels used at this level of nesting.  */
 442   struct c_label_list *labels_used;
 443   /* The next outermost context.  */
 444   struct c_label_context_se *next;
 445 };
 446
 447 /* Context of variably modified declarations.  */
 448
 449 struct c_label_context_vm
 450 {
 451   /* The labels defined at this level of nesting.  */
 452   struct c_label_list *labels_def;
 453   /* The labels used at this level of nesting.  */
 454   struct c_label_list *labels_used;
 455   /* The scope of this context.  Multiple contexts may be at the same
 456      numbered scope, since each variably modified declaration starts a
 457      new context.  */
 458   unsigned scope;
 459   /* The next outermost context.  */
 460   struct c_label_context_vm *next;
 461 };
 462
 463 /* Used when parsing an enum.  Initialized by start_enum.  */
 464 struct c_enum_contents
 465 {
 466   /* While defining an enum type, this is 1 plus the last enumerator
 467      constant value.  */
 468   tree enum_next_value;
 469
 470   /* Nonzero means that there was overflow computing enum_next_value.  */
 471   int enum_overflow;
 472 };
 473
 474 /* A type of reference to a static identifier in an inline
 475    function.  */
 476 enum c_inline_static_type {
 477   /* Identifier with internal linkage used in function that may be an
 478      inline definition (i.e., file-scope static).  */
 479   csi_internal,
 480   /* Modifiable object with static storage duration defined in
 481      function that may be an inline definition (i.e., local
 482      static).  */
 483   csi_modifiable
 484 };
 485
 486 \f
 487 /* in c-parser.c */
 488 extern void c_parse_init (void);
 489
 490 /* in c-aux-info.c */
 491 extern void gen_aux_info_record (tree, int, int, int);
 492
 493 /* in c-decl.c */
 494 extern struct obstack parser_obstack;
 495 extern tree c_break_label;
 496 extern tree c_cont_label;
 497
 498 extern int global_bindings_p (void);
 499 extern void push_scope (void);
 500 extern tree pop_scope (void);
 501
 502 extern void record_inline_static (location_t, tree, tree,
 503                                   enum c_inline_static_type);
 504 extern void c_init_decl_processing (void);
 505 extern void c_dup_lang_specific_decl (tree);
 506 extern void c_print_identifier (FILE *, tree, int);
 507 extern int quals_from_declspecs (const struct c_declspecs *);
 508 extern struct c_declarator *build_array_declarator (tree, struct c_declspecs *,
 509                                                     bool, bool);
 510 extern tree build_enumerator (struct c_enum_contents *, tree, tree, location_t);
 511 extern tree check_for_loop_decls (void);
 512 extern void mark_forward_parm_decls (void);
 513 extern void declare_parm_level (void);
 514 extern void undeclared_variable (tree, location_t);
 515 extern tree declare_label (tree);
 516 extern tree define_label (location_t, tree);
 517 extern void c_maybe_initialize_eh (void);
 518 extern void finish_decl (tree, tree, tree, tree);
 519 extern tree finish_enum (tree, tree, tree);
 520 extern void finish_function (void);
 521 extern tree finish_struct (tree, tree, tree, bool, VEC(tree,heap) *);
 522 extern struct c_arg_info *get_parm_info (bool);
 523 extern tree grokfield (location_t, struct c_declarator *,
 524                        struct c_declspecs *, tree, tree *);
 525 extern tree groktypename (struct c_type_name *, tree *, bool *);
 526 extern tree grokparm (const struct c_parm *);
 527 extern tree implicitly_declare (tree);
 528 extern void keep_next_level (void);
 529 extern void pending_xref_error (void);
 530 extern void c_push_function_context (void);
 531 extern void c_pop_function_context (void);
 532 extern void push_parm_decl (const struct c_parm *);
 533 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
 534                                                         struct c_declarator *);
 535 extern tree c_builtin_function (tree);
 536 extern tree c_builtin_function_ext_scope (tree);
 537 extern void shadow_tag (const struct c_declspecs *);
 538 extern void shadow_tag_warned (const struct c_declspecs *, int);
 539 extern tree start_enum (struct c_enum_contents *, tree, location_t);
 540 extern int  start_function (struct c_declspecs *, struct c_declarator *, tree);
 541 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
 542                         tree);
 543 extern tree start_struct (enum tree_code, tree, bool *, VEC(tree,heap) **,
 544                           location_t);
 545 extern void store_parm_decls (void);
 546 extern void store_parm_decls_from (struct c_arg_info *);
 547 extern tree xref_tag (enum tree_code, tree);
 548 extern struct c_typespec parser_xref_tag (enum tree_code, tree, location_t);
 549 extern int c_expand_decl (tree);
 550 extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
 551                                     struct c_declarator *);
 552 extern struct c_declarator *build_attrs_declarator (tree,
 553                                                     struct c_declarator *);
 554 extern struct c_declarator *build_function_declarator (struct c_arg_info *,
 555                                                        struct c_declarator *);
 556 extern struct c_declarator *build_id_declarator (tree);
 557 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
 558                                                      struct c_declarator *);
 559 extern struct c_declspecs *build_null_declspecs (void);
 560 extern struct c_declspecs *declspecs_add_qual (struct c_declspecs *, tree);
 561 extern struct c_declspecs *declspecs_add_type (struct c_declspecs *,
 562                                                struct c_typespec);
 563 extern struct c_declspecs *declspecs_add_scspec (struct c_declspecs *, tree);
 564 extern struct c_declspecs *declspecs_add_attrs (struct c_declspecs *, tree);
 565 extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
 566
 567 /* in c-objc-common.c */
 568 extern bool c_objc_common_init (void);
 569 extern bool c_missing_noreturn_ok_p (tree);
 570 extern bool c_warn_unused_global_decl (const_tree);
 571 extern void c_initialize_diagnostics (diagnostic_context *);
 572 extern bool c_vla_unspec_p (tree x, tree fn);
 573
 574 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P)           \
 575   c_build_qualified_type ((TYPE),                                 \
 576                           ((CONST_P) ? TYPE_QUAL_CONST : 0) |     \
 577                           ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
 578
 579 /* in c-typeck.c */
 580 extern bool in_late_binary_op;
 581 extern int in_alignof;
 582 extern int in_sizeof;
 583 extern int in_typeof;
 584
 585 extern struct c_switch *c_switch_stack;
 586 extern struct c_label_context_se *label_context_stack_se;
 587 extern struct c_label_context_vm *label_context_stack_vm;
 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 bool c_vla_type_p (const_tree);
 594 extern bool c_mark_addressable (tree);
 595 extern void c_incomplete_type_error (const_tree, const_tree);
 596 extern tree c_type_promotes_to (tree);
 597 extern struct c_expr default_function_array_conversion (struct c_expr);
 598 extern tree composite_type (tree, tree);
 599 extern tree build_component_ref (tree, tree);
 600 extern tree build_array_ref (tree, tree, location_t);
 601 extern tree build_external_ref (tree, int, location_t, tree *);
 602 extern void pop_maybe_used (bool);
 603 extern struct c_expr c_expr_sizeof_expr (struct c_expr);
 604 extern struct c_expr c_expr_sizeof_type (struct c_type_name *);
 605 extern struct c_expr parser_build_unary_op (enum tree_code, struct c_expr,
 606                                             location_t);
 607 extern struct c_expr parser_build_binary_op (location_t,
 608                                              enum tree_code, struct c_expr,
 609                                              struct c_expr);
 610 extern tree build_conditional_expr (tree, bool, tree, tree);
 611 extern tree build_compound_expr (tree, tree);
 612 extern tree c_cast_expr (struct c_type_name *, tree, location_t);
 613 extern tree build_c_cast (tree, tree);
 614 extern void store_init_value (tree, tree, tree);
 615 extern void error_init (const char *);
 616 extern void pedwarn_init (location_t, int opt, const char *);
 617 extern void maybe_warn_string_init (tree, struct c_expr);
 618 extern void start_init (tree, tree, int);
 619 extern void finish_init (void);
 620 extern void really_start_incremental_init (tree);
 621 extern void push_init_level (int);
 622 extern struct c_expr pop_init_level (int);
 623 extern void set_init_index (tree, tree);
 624 extern void set_init_label (tree);
 625 extern void process_init_element (struct c_expr, bool);
 626 extern tree build_compound_literal (tree, tree, bool);
 627 extern void check_compound_literal_type (struct c_type_name *, location_t);
 628 extern tree c_start_case (tree);
 629 extern void c_finish_case (tree);
 630 extern tree build_asm_expr (tree, tree, tree, tree, bool);
 631 extern tree build_asm_stmt (tree, tree);
 632 extern int c_types_compatible_p (tree, tree);
 633 extern tree c_begin_compound_stmt (bool);
 634 extern tree c_end_compound_stmt (tree, bool);
 635 extern void c_finish_if_stmt (location_t, tree, tree, tree, bool);
 636 extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, bool);
 637 extern tree c_begin_stmt_expr (void);
 638 extern tree c_finish_stmt_expr (tree);
 639 extern tree c_process_expr_stmt (tree);
 640 extern tree c_finish_expr_stmt (tree);
 641 extern tree c_finish_return (tree, tree);
 642 extern tree c_finish_bc_stmt (tree *, bool);
 643 extern tree c_finish_goto_label (tree);
 644 extern tree c_finish_goto_ptr (tree);
 645 extern void c_begin_vm_scope (unsigned int);
 646 extern void c_end_vm_scope (unsigned int);
 647 extern tree c_expr_to_decl (tree, bool *, bool *);
 648 extern tree c_begin_omp_parallel (void);
 649 extern tree c_finish_omp_parallel (tree, tree);
 650 extern tree c_begin_omp_task (void);
 651 extern tree c_finish_omp_task (tree, tree);
 652 extern tree c_finish_omp_clauses (tree);
 653
 654 /* Set to 0 at beginning of a function definition, set to 1 if
 655    a return statement that specifies a return value is seen.  */
 656
 657 extern int current_function_returns_value;
 658
 659 /* Set to 0 at beginning of a function definition, set to 1 if
 660    a return statement with no argument is seen.  */
 661
 662 extern int current_function_returns_null;
 663
 664 /* Set to 0 at beginning of a function definition, set to 1 if
 665    a call to a noreturn function is seen.  */
 666
 667 extern int current_function_returns_abnormally;
 668
 669 /* Nonzero means we are reading code that came from a system header file.  */
 670
 671 extern int system_header_p;
 672
 673 /* True means global_bindings_p should return false even if the scope stack
 674    says we are in file scope.  */
 675
 676 extern bool c_override_global_bindings_to_false;
 677
 678 /* True means we've initialized exception handling.  */
 679 extern bool c_eh_initialized_p;
 680
 681 /* In c-decl.c */
 682 extern void c_finish_incomplete_decl (tree);
 683 extern void c_write_global_declarations (void);
 684
 685 /* In order for the format checking to accept the C frontend
 686    diagnostic framework extensions, you must include this file before
 687    toplev.h, not after.  */
 688 #if GCC_VERSION >= 4001
 689 #define ATTRIBUTE_GCC_CDIAG(m, n) __attribute__ ((__format__ (GCC_DIAG_STYLE, m ,n))) ATTRIBUTE_NONNULL(m)
 690 #else
 691 #define ATTRIBUTE_GCC_CDIAG(m, n) ATTRIBUTE_NONNULL(m)
 692 #endif
 693
 694 extern void pedwarn_c90 (location_t, int opt, const char *, ...) ATTRIBUTE_GCC_CDIAG(3,4);
 695 extern void pedwarn_c99 (location_t, int opt, const char *, ...) ATTRIBUTE_GCC_CDIAG(3,4);
 696
 697 extern bool c_cpp_error (cpp_reader *, int, location_t, unsigned int,
 698                          const char *, va_list *)
 699      ATTRIBUTE_GCC_CDIAG(5,0);
 700
 701 #endif /* ! GCC_C_TREE_H */