gcc/c/c-tree.h

   1 /* Definitions for C parsing and type checking.
   2    Copyright (C) 1987-2017 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   /* The source range of this expression.  This is redundant
 137      for node values that have locations, but not all node kinds
 138      have locations (e.g. constants, and references to params, locals,
 139      etc), so we stash a copy here.  */
 140   source_range src_range;
 141
 142   /* Access to the first and last locations within the source spelling
 143      of this expression.  */
 144   location_t get_start () const { return src_range.m_start; }
 145   location_t get_finish () const { return src_range.m_finish; }
 146
 147   /* Set the value to error_mark_node whilst ensuring that src_range
 148      is initialized.  */
 149   void set_error ()
 150   {
 151     value = error_mark_node;
 152     src_range.m_start = UNKNOWN_LOCATION;
 153     src_range.m_finish = UNKNOWN_LOCATION;
 154   }
 155 };
 156
 157 /* Type alias for struct c_expr. This allows to use the structure
 158    inside the VEC types.  */
 159 typedef struct c_expr c_expr_t;
 160
 161 /* A kind of type specifier.  Note that this information is currently
 162    only used to distinguish tag definitions, tag references and typeof
 163    uses.  */
 164 enum c_typespec_kind {
 165   /* No typespec.  This appears only in struct c_declspec.  */
 166   ctsk_none,
 167   /* A reserved keyword type specifier.  */
 168   ctsk_resword,
 169   /* A reference to a tag, previously declared, such as "struct foo".
 170      This includes where the previous declaration was as a different
 171      kind of tag, in which case this is only valid if shadowing that
 172      tag in an inner scope.  */
 173   ctsk_tagref,
 174   /* A reference to a tag, not previously declared in a visible
 175      scope.  */
 176   ctsk_tagfirstref,
 177   /* A definition of a tag such as "struct foo { int a; }".  */
 178   ctsk_tagdef,
 179   /* A typedef name.  */
 180   ctsk_typedef,
 181   /* An ObjC-specific kind of type specifier.  */
 182   ctsk_objc,
 183   /* A typeof specifier, or _Atomic ( type-name ).  */
 184   ctsk_typeof
 185 };
 186
 187 /* A type specifier: this structure is created in the parser and
 188    passed to declspecs_add_type only.  */
 189 struct c_typespec {
 190   /* What kind of type specifier this is.  */
 191   enum c_typespec_kind kind;
 192   /* Whether the expression has operands suitable for use in constant
 193      expressions.  */
 194   bool expr_const_operands;
 195   /* The specifier itself.  */
 196   tree spec;
 197   /* An expression to be evaluated before the type specifier, in the
 198      case of typeof specifiers, or NULL otherwise or if no such
 199      expression is required for a particular typeof specifier.  In
 200      particular, when typeof is applied to an expression of variably
 201      modified type, that expression must be evaluated in order to
 202      determine array sizes that form part of the type, but the
 203      expression itself (as opposed to the array sizes) forms no part
 204      of the type and so needs to be recorded separately.  */
 205   tree expr;
 206 };
 207
 208 /* A storage class specifier.  */
 209 enum c_storage_class {
 210   csc_none,
 211   csc_auto,
 212   csc_extern,
 213   csc_register,
 214   csc_static,
 215   csc_typedef
 216 };
 217
 218 /* A type specifier keyword "void", "_Bool", "char", "int", "float",
 219    "double", "_Decimal32", "_Decimal64", "_Decimal128", "_Fract", "_Accum",
 220    or none of these.  */
 221 enum c_typespec_keyword {
 222   cts_none,
 223   cts_void,
 224   cts_bool,
 225   cts_char,
 226   cts_int,
 227   cts_float,
 228   cts_int_n,
 229   cts_double,
 230   cts_dfloat32,
 231   cts_dfloat64,
 232   cts_dfloat128,
 233   cts_floatn_nx,
 234   cts_fract,
 235   cts_accum,
 236   cts_auto_type
 237 };
 238
 239 /* This enum lists all the possible declarator specifiers, storage
 240    class or attribute that a user can write.  There is at least one
 241    enumerator per possible declarator specifier in the struct
 242    c_declspecs below.
 243
 244    It is used to index the array of declspec locations in struct
 245    c_declspecs.  */
 246 enum c_declspec_word {
 247   cdw_typespec /* A catch-all for a typespec.  */,
 248   cdw_storage_class  /* A catch-all for a storage class */,
 249   cdw_attributes,
 250   cdw_typedef,
 251   cdw_explicit_signed,
 252   cdw_deprecated,
 253   cdw_default_int,
 254   cdw_long,
 255   cdw_long_long,
 256   cdw_short,
 257   cdw_signed,
 258   cdw_unsigned,
 259   cdw_complex,
 260   cdw_inline,
 261   cdw_noreturn,
 262   cdw_thread,
 263   cdw_const,
 264   cdw_volatile,
 265   cdw_restrict,
 266   cdw_atomic,
 267   cdw_saturating,
 268   cdw_alignas,
 269   cdw_address_space,
 270   cdw_gimple,
 271   cdw_rtl,
 272   cdw_number_of_elements /* This one must always be the last
 273                             enumerator.  */
 274 };
 275
 276 /* A sequence of declaration specifiers in C.  When a new declaration
 277    specifier is added, please update the enum c_declspec_word above
 278    accordingly.  */
 279 struct c_declspecs {
 280   source_location locations[cdw_number_of_elements];
 281   /* The type specified, if a single type specifier such as a struct,
 282      union or enum specifier, typedef name or typeof specifies the
 283      whole type, or NULL_TREE if none or a keyword such as "void" or
 284      "char" is used.  Does not include qualifiers.  */
 285   tree type;
 286   /* Any expression to be evaluated before the type, from a typeof
 287      specifier.  */
 288   tree expr;
 289   /* The attributes from a typedef decl.  */
 290   tree decl_attr;
 291   /* When parsing, the attributes.  Outside the parser, this will be
 292      NULL; attributes (possibly from multiple lists) will be passed
 293      separately.  */
 294   tree attrs;
 295   /* The pass to start compiling a __GIMPLE or __RTL function with.  */
 296   char *gimple_or_rtl_pass;
 297   /* The base-2 log of the greatest alignment required by an _Alignas
 298      specifier, in bytes, or -1 if no such specifiers with nonzero
 299      alignment.  */
 300   int align_log;
 301   /* For the __intN declspec, this stores the index into the int_n_* arrays.  */
 302   int int_n_idx;
 303   /* For the _FloatN and _FloatNx declspec, this stores the index into
 304      the floatn_nx_types array.  */
 305   int floatn_nx_idx;
 306   /* The storage class specifier, or csc_none if none.  */
 307   enum c_storage_class storage_class;
 308   /* Any type specifier keyword used such as "int", not reflecting
 309      modifiers such as "short", or cts_none if none.  */
 310   ENUM_BITFIELD (c_typespec_keyword) typespec_word : 8;
 311   /* The kind of type specifier if one has been seen, ctsk_none
 312      otherwise.  */
 313   ENUM_BITFIELD (c_typespec_kind) typespec_kind : 3;
 314   /* Whether any expressions in typeof specifiers may appear in
 315      constant expressions.  */
 316   BOOL_BITFIELD expr_const_operands : 1;
 317   /* Whether any declaration specifiers have been seen at all.  */
 318   BOOL_BITFIELD declspecs_seen_p : 1;
 319   /* Whether something other than a storage class specifier or
 320      attribute has been seen.  This is used to warn for the
 321      obsolescent usage of storage class specifiers other than at the
 322      start of the list.  (Doing this properly would require function
 323      specifiers to be handled separately from storage class
 324      specifiers.)  */
 325   BOOL_BITFIELD non_sc_seen_p : 1;
 326   /* Whether the type is specified by a typedef or typeof name.  */
 327   BOOL_BITFIELD typedef_p : 1;
 328   /* Whether the type is explicitly "signed" or specified by a typedef
 329      whose type is explicitly "signed".  */
 330   BOOL_BITFIELD explicit_signed_p : 1;
 331   /* Whether the specifiers include a deprecated typedef.  */
 332   BOOL_BITFIELD deprecated_p : 1;
 333   /* Whether the type defaulted to "int" because there were no type
 334      specifiers.  */
 335   BOOL_BITFIELD default_int_p : 1;
 336   /* Whether "long" was specified.  */
 337   BOOL_BITFIELD long_p : 1;
 338   /* Whether "long" was specified more than once.  */
 339   BOOL_BITFIELD long_long_p : 1;
 340   /* Whether "short" was specified.  */
 341   BOOL_BITFIELD short_p : 1;
 342   /* Whether "signed" was specified.  */
 343   BOOL_BITFIELD signed_p : 1;
 344   /* Whether "unsigned" was specified.  */
 345   BOOL_BITFIELD unsigned_p : 1;
 346   /* Whether "complex" was specified.  */
 347   BOOL_BITFIELD complex_p : 1;
 348   /* Whether "inline" was specified.  */
 349   BOOL_BITFIELD inline_p : 1;
 350   /* Whether "_Noreturn" was speciied.  */
 351   BOOL_BITFIELD noreturn_p : 1;
 352   /* Whether "__thread" or "_Thread_local" was specified.  */
 353   BOOL_BITFIELD thread_p : 1;
 354   /* Whether "__thread" rather than "_Thread_local" was specified.  */
 355   BOOL_BITFIELD thread_gnu_p : 1;
 356   /* Whether "const" was specified.  */
 357   BOOL_BITFIELD const_p : 1;
 358   /* Whether "volatile" was specified.  */
 359   BOOL_BITFIELD volatile_p : 1;
 360   /* Whether "restrict" was specified.  */
 361   BOOL_BITFIELD restrict_p : 1;
 362   /* Whether "_Atomic" was specified.  */
 363   BOOL_BITFIELD atomic_p : 1;
 364   /* Whether "_Sat" was specified.  */
 365   BOOL_BITFIELD saturating_p : 1;
 366   /* Whether any alignment specifier (even with zero alignment) was
 367      specified.  */
 368   BOOL_BITFIELD alignas_p : 1;
 369   /* Whether any __GIMPLE specifier was specified.  */
 370   BOOL_BITFIELD gimple_p : 1;
 371   /* Whether any __RTL specifier was specified.  */
 372   BOOL_BITFIELD rtl_p : 1;
 373   /* The address space that the declaration belongs to.  */
 374   addr_space_t address_space;
 375 };
 376
 377 /* The various kinds of declarators in C.  */
 378 enum c_declarator_kind {
 379   /* An identifier.  */
 380   cdk_id,
 381   /* A function.  */
 382   cdk_function,
 383   /* An array.  */
 384   cdk_array,
 385   /* A pointer.  */
 386   cdk_pointer,
 387   /* Parenthesized declarator with nested attributes.  */
 388   cdk_attrs
 389 };
 390
 391 struct c_arg_tag {
 392   /* The argument name.  */
 393   tree id;
 394   /* The type of the argument.  */
 395   tree type;
 396 };
 397
 398
 399 /* Information about the parameters in a function declarator.  */
 400 struct c_arg_info {
 401   /* A list of parameter decls.  */
 402   tree parms;
 403   /* A list of structure, union and enum tags defined.  */
 404   vec<c_arg_tag, va_gc> *tags;
 405   /* A list of argument types to go in the FUNCTION_TYPE.  */
 406   tree types;
 407   /* A list of non-parameter decls (notably enumeration constants)
 408      defined with the parameters.  */
 409   tree others;
 410   /* A compound expression of VLA sizes from the parameters, or NULL.
 411      In a function definition, these are used to ensure that
 412      side-effects in sizes of arrays converted to pointers (such as a
 413      parameter int i[n++]) take place; otherwise, they are
 414      ignored.  */
 415   tree pending_sizes;
 416   /* True when these arguments had [*].  */
 417   BOOL_BITFIELD had_vla_unspec : 1;
 418 };
 419
 420 /* A declarator.  */
 421 struct c_declarator {
 422   /* The kind of declarator.  */
 423   enum c_declarator_kind kind;
 424   location_t id_loc; /* Currently only set for cdk_id, cdk_array. */
 425   /* Except for cdk_id, the contained declarator.  For cdk_id, NULL.  */
 426   struct c_declarator *declarator;
 427   union {
 428     /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
 429        declarator.  */
 430     tree id;
 431     /* For functions.  */
 432     struct c_arg_info *arg_info;
 433     /* For arrays.  */
 434     struct {
 435       /* The array dimension, or NULL for [] and [*].  */
 436       tree dimen;
 437       /* The qualifiers inside [].  */
 438       int quals;
 439       /* The attributes (currently ignored) inside [].  */
 440       tree attrs;
 441       /* Whether [static] was used.  */
 442       BOOL_BITFIELD static_p : 1;
 443       /* Whether [*] was used.  */
 444       BOOL_BITFIELD vla_unspec_p : 1;
 445     } array;
 446     /* For pointers, the qualifiers on the pointer type.  */
 447     int pointer_quals;
 448     /* For attributes.  */
 449     tree attrs;
 450   } u;
 451 };
 452
 453 /* A type name.  */
 454 struct c_type_name {
 455   /* The declaration specifiers.  */
 456   struct c_declspecs *specs;
 457   /* The declarator.  */
 458   struct c_declarator *declarator;
 459 };
 460
 461 /* A parameter.  */
 462 struct c_parm {
 463   /* The declaration specifiers, minus any prefix attributes.  */
 464   struct c_declspecs *specs;
 465   /* The attributes.  */
 466   tree attrs;
 467   /* The declarator.  */
 468   struct c_declarator *declarator;
 469 };
 470
 471 /* Used when parsing an enum.  Initialized by start_enum.  */
 472 struct c_enum_contents
 473 {
 474   /* While defining an enum type, this is 1 plus the last enumerator
 475      constant value.  */
 476   tree enum_next_value;
 477
 478   /* Nonzero means that there was overflow computing enum_next_value.  */
 479   int enum_overflow;
 480 };
 481
 482 /* A type of reference to a static identifier in an inline
 483    function.  */
 484 enum c_inline_static_type {
 485   /* Identifier with internal linkage used in function that may be an
 486      inline definition (i.e., file-scope static).  */
 487   csi_internal,
 488   /* Modifiable object with static storage duration defined in
 489      function that may be an inline definition (i.e., local
 490      static).  */
 491   csi_modifiable
 492 };
 493
 494 \f
 495 /* in c-parser.c */
 496 extern void c_parse_init (void);
 497 extern bool c_keyword_starts_typename (enum rid keyword);
 498
 499 /* in c-aux-info.c */
 500 extern void gen_aux_info_record (tree, int, int, int);
 501
 502 /* in c-decl.c */
 503 struct c_spot_bindings;
 504 struct c_struct_parse_info;
 505 extern struct obstack parser_obstack;
 506 extern tree c_break_label;
 507 extern tree c_cont_label;
 508
 509 extern bool global_bindings_p (void);
 510 extern void push_scope (void);
 511 extern tree pop_scope (void);
 512 extern void c_bindings_start_stmt_expr (struct c_spot_bindings *);
 513 extern void c_bindings_end_stmt_expr (struct c_spot_bindings *);
 514
 515 extern void record_inline_static (location_t, tree, tree,
 516                                   enum c_inline_static_type);
 517 extern void c_init_decl_processing (void);
 518 extern void c_print_identifier (FILE *, tree, int);
 519 extern int quals_from_declspecs (const struct c_declspecs *);
 520 extern struct c_declarator *build_array_declarator (location_t, tree,
 521                                                     struct c_declspecs *,
 522                                                     bool, bool);
 523 extern tree build_enumerator (location_t, location_t, struct c_enum_contents *,
 524                               tree, tree);
 525 extern tree check_for_loop_decls (location_t, bool);
 526 extern void mark_forward_parm_decls (void);
 527 extern void declare_parm_level (void);
 528 extern void undeclared_variable (location_t, tree);
 529 extern tree lookup_label_for_goto (location_t, tree);
 530 extern tree declare_label (tree);
 531 extern tree define_label (location_t, tree);
 532 extern struct c_spot_bindings *c_get_switch_bindings (void);
 533 extern void c_release_switch_bindings (struct c_spot_bindings *);
 534 extern bool c_check_switch_jump_warnings (struct c_spot_bindings *,
 535                                           location_t, location_t);
 536 extern void finish_decl (tree, location_t, tree, tree, tree);
 537 extern tree finish_enum (tree, tree, tree);
 538 extern void finish_function (void);
 539 extern tree finish_struct (location_t, tree, tree, tree,
 540                            struct c_struct_parse_info *);
 541 extern struct c_arg_info *build_arg_info (void);
 542 extern struct c_arg_info *get_parm_info (bool, tree);
 543 extern tree grokfield (location_t, struct c_declarator *,
 544                        struct c_declspecs *, tree, tree *);
 545 extern tree groktypename (struct c_type_name *, tree *, bool *);
 546 extern tree grokparm (const struct c_parm *, tree *);
 547 extern tree implicitly_declare (location_t, tree);
 548 extern void keep_next_level (void);
 549 extern void pending_xref_error (void);
 550 extern void c_push_function_context (void);
 551 extern void c_pop_function_context (void);
 552 extern void push_parm_decl (const struct c_parm *, tree *);
 553 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
 554                                                         struct c_declarator *);
 555 extern tree c_builtin_function (tree);
 556 extern tree c_builtin_function_ext_scope (tree);
 557 extern void shadow_tag (const struct c_declspecs *);
 558 extern void shadow_tag_warned (const struct c_declspecs *, int);
 559 extern tree start_enum (location_t, struct c_enum_contents *, tree);
 560 extern int  start_function (struct c_declspecs *, struct c_declarator *, tree);
 561 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
 562                         tree);
 563 extern tree start_struct (location_t, enum tree_code, tree,
 564                           struct c_struct_parse_info **);
 565 extern void store_parm_decls (void);
 566 extern void store_parm_decls_from (struct c_arg_info *);
 567 extern void temp_store_parm_decls (tree, tree);
 568 extern void temp_pop_parm_decls (void);
 569 extern tree xref_tag (enum tree_code, tree);
 570 extern struct c_typespec parser_xref_tag (location_t, enum tree_code, tree);
 571 extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
 572                                     struct c_declarator *);
 573 extern struct c_declarator *build_attrs_declarator (tree,
 574                                                     struct c_declarator *);
 575 extern struct c_declarator *build_function_declarator (struct c_arg_info *,
 576                                                        struct c_declarator *);
 577 extern struct c_declarator *build_id_declarator (tree);
 578 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
 579                                                      struct c_declarator *);
 580 extern struct c_declspecs *build_null_declspecs (void);
 581 extern struct c_declspecs *declspecs_add_qual (source_location,
 582                                                struct c_declspecs *, tree);
 583 extern struct c_declspecs *declspecs_add_type (location_t,
 584                                                struct c_declspecs *,
 585                                                struct c_typespec);
 586 extern struct c_declspecs *declspecs_add_scspec (source_location,
 587                                                  struct c_declspecs *, tree);
 588 extern struct c_declspecs *declspecs_add_attrs (source_location,
 589                                                 struct c_declspecs *, tree);
 590 extern struct c_declspecs *declspecs_add_addrspace (source_location,
 591                                                     struct c_declspecs *,
 592                                                     addr_space_t);
 593 extern struct c_declspecs *declspecs_add_alignas (source_location,
 594                                                   struct c_declspecs *, tree);
 595 extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
 596
 597 /* in c-objc-common.c */
 598 extern bool c_objc_common_init (void);
 599 extern bool c_missing_noreturn_ok_p (tree);
 600 extern bool c_warn_unused_global_decl (const_tree);
 601 extern void c_initialize_diagnostics (diagnostic_context *);
 602 extern bool c_vla_unspec_p (tree x, tree fn);
 603
 604 /* in c-typeck.c */
 605 extern int in_alignof;
 606 extern int in_sizeof;
 607 extern int in_typeof;
 608
 609 extern tree c_last_sizeof_arg;
 610
 611 extern struct c_switch *c_switch_stack;
 612
 613 extern tree c_objc_common_truthvalue_conversion (location_t, tree);
 614 extern tree require_complete_type (location_t, tree);
 615 extern int same_translation_unit_p (const_tree, const_tree);
 616 extern int comptypes (tree, tree);
 617 extern int comptypes_check_different_types (tree, tree, bool *);
 618 extern bool c_vla_type_p (const_tree);
 619 extern bool c_mark_addressable (tree);
 620 extern void c_incomplete_type_error (location_t, const_tree, const_tree);
 621 extern tree c_type_promotes_to (tree);
 622 extern struct c_expr default_function_array_conversion (location_t,
 623                                                         struct c_expr);
 624 extern struct c_expr default_function_array_read_conversion (location_t,
 625                                                              struct c_expr);
 626 extern struct c_expr convert_lvalue_to_rvalue (location_t, struct c_expr,
 627                                                bool, bool);
 628 extern void mark_exp_read (tree);
 629 extern tree composite_type (tree, tree);
 630 extern tree build_component_ref (location_t, tree, tree, location_t);
 631 extern tree build_array_ref (location_t, tree, tree);
 632 extern tree build_external_ref (location_t, tree, int, tree *);
 633 extern void pop_maybe_used (bool);
 634 extern struct c_expr c_expr_sizeof_expr (location_t, struct c_expr);
 635 extern struct c_expr c_expr_sizeof_type (location_t, struct c_type_name *);
 636 extern struct c_expr parser_build_unary_op (location_t, enum tree_code,
 637                                             struct c_expr);
 638 extern struct c_expr parser_build_binary_op (location_t,
 639                                              enum tree_code, struct c_expr,
 640                                              struct c_expr);
 641 extern tree build_conditional_expr (location_t, tree, bool, tree, tree,
 642                                     tree, tree);
 643 extern tree build_compound_expr (location_t, tree, tree);
 644 extern tree c_cast_expr (location_t, struct c_type_name *, tree);
 645 extern tree build_c_cast (location_t, tree, tree);
 646 extern void store_init_value (location_t, tree, tree, tree);
 647 extern void maybe_warn_string_init (location_t, tree, struct c_expr);
 648 extern void start_init (tree, tree, int, rich_location *);
 649 extern void finish_init (void);
 650 extern void really_start_incremental_init (tree);
 651 extern void finish_implicit_inits (location_t, struct obstack *);
 652 extern void push_init_level (location_t, int, struct obstack *);
 653 extern struct c_expr pop_init_level (location_t, int, struct obstack *,
 654                                      location_t);
 655 extern void set_init_index (location_t, tree, tree, struct obstack *);
 656 extern void set_init_label (location_t, tree, location_t, struct obstack *);
 657 extern void process_init_element (location_t, struct c_expr, bool,
 658                                   struct obstack *);
 659 extern tree build_compound_literal (location_t, tree, tree, bool);
 660 extern void check_compound_literal_type (location_t, struct c_type_name *);
 661 extern tree c_start_case (location_t, location_t, tree, bool);
 662 extern void c_finish_case (tree, tree);
 663 extern tree build_asm_expr (location_t, tree, tree, tree, tree, tree, bool);
 664 extern tree build_asm_stmt (tree, tree);
 665 extern int c_types_compatible_p (tree, tree);
 666 extern tree c_begin_compound_stmt (bool);
 667 extern tree c_end_compound_stmt (location_t, tree, bool);
 668 extern void c_finish_if_stmt (location_t, tree, tree, tree);
 669 extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, bool);
 670 extern tree c_begin_stmt_expr (void);
 671 extern tree c_finish_stmt_expr (location_t, tree);
 672 extern tree c_process_expr_stmt (location_t, tree);
 673 extern tree c_finish_expr_stmt (location_t, tree);
 674 extern tree c_finish_return (location_t, tree, tree);
 675 extern tree c_finish_bc_stmt (location_t, tree *, bool);
 676 extern tree c_finish_goto_label (location_t, tree);
 677 extern tree c_finish_goto_ptr (location_t, tree);
 678 extern tree c_expr_to_decl (tree, bool *, bool *);
 679 extern tree c_finish_omp_construct (location_t, enum tree_code, tree, tree);
 680 extern tree c_finish_oacc_data (location_t, tree, tree);
 681 extern tree c_finish_oacc_host_data (location_t, tree, tree);
 682 extern tree c_begin_omp_parallel (void);
 683 extern tree c_finish_omp_parallel (location_t, tree, tree);
 684 extern tree c_begin_omp_task (void);
 685 extern tree c_finish_omp_task (location_t, tree, tree);
 686 extern void c_finish_omp_cancel (location_t, tree);
 687 extern void c_finish_omp_cancellation_point (location_t, tree);
 688 extern tree c_finish_omp_clauses (tree, enum c_omp_region_type);
 689 extern tree c_build_va_arg (location_t, tree, location_t, tree);
 690 extern tree c_finish_transaction (location_t, tree, int);
 691 extern bool c_tree_equal (tree, tree);
 692 extern tree c_build_function_call_vec (location_t, vec<location_t>, tree,
 693                                        vec<tree, va_gc> *, vec<tree, va_gc> *);
 694 extern tree c_omp_clause_copy_ctor (tree, tree, tree);
 695
 696 /* Set to 0 at beginning of a function definition, set to 1 if
 697    a return statement that specifies a return value is seen.  */
 698
 699 extern int current_function_returns_value;
 700
 701 /* Set to 0 at beginning of a function definition, set to 1 if
 702    a return statement with no argument is seen.  */
 703
 704 extern int current_function_returns_null;
 705
 706 /* Set to 0 at beginning of a function definition, set to 1 if
 707    a call to a noreturn function is seen.  */
 708
 709 extern int current_function_returns_abnormally;
 710
 711 /* In c-decl.c */
 712
 713 /* Tell the binding oracle what kind of binding we are looking for.  */
 714
 715 enum c_oracle_request
 716 {
 717   C_ORACLE_SYMBOL,
 718   C_ORACLE_TAG,
 719   C_ORACLE_LABEL
 720 };
 721
 722 /* If this is non-NULL, then it is a "binding oracle" which can lazily
 723    create bindings when needed by the C compiler.  The oracle is told
 724    the name and type of the binding to create.  It can call pushdecl
 725    or the like to ensure the binding is visible; or do nothing,
 726    leaving the binding untouched.  c-decl.c takes note of when the
 727    oracle has been called and will not call it again if it fails to
 728    create a given binding.  */
 729
 730 typedef void c_binding_oracle_function (enum c_oracle_request, tree identifier);
 731
 732 extern c_binding_oracle_function *c_binding_oracle;
 733
 734 extern void c_finish_incomplete_decl (tree);
 735 extern tree c_omp_reduction_id (enum tree_code, tree);
 736 extern tree c_omp_reduction_decl (tree);
 737 extern tree c_omp_reduction_lookup (tree, tree);
 738 extern tree c_check_omp_declare_reduction_r (tree *, int *, void *);
 739 extern void c_pushtag (location_t, tree, tree);
 740 extern void c_bind (location_t, tree, bool);
 741 extern bool tag_exists_p (enum tree_code, tree);
 742
 743 /* In c-errors.c */
 744 extern bool pedwarn_c90 (location_t, int opt, const char *, ...)
 745     ATTRIBUTE_GCC_DIAG(3,4);
 746 extern bool pedwarn_c99 (location_t, int opt, const char *, ...)
 747     ATTRIBUTE_GCC_DIAG(3,4);
 748
 749 extern void
 750 set_c_expr_source_range (c_expr *expr,
 751                          location_t start, location_t finish);
 752
 753 extern void
 754 set_c_expr_source_range (c_expr *expr,
 755                          source_range src_range);
 756
 757 /* In c-fold.c */
 758 extern tree decl_constant_value_for_optimization (tree);
 759
 760 extern vec<tree> incomplete_record_decls;
 761
 762 #endif /* ! GCC_C_TREE_H */