gcc/c/c-tree.h

   1 /* Definitions for C parsing and type checking.
   2    Copyright (C) 1987-2016 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
 148 /* Type alias for struct c_expr. This allows to use the structure
 149    inside the VEC types.  */
 150 typedef struct c_expr c_expr_t;
 151
 152 /* A kind of type specifier.  Note that this information is currently
 153    only used to distinguish tag definitions, tag references and typeof
 154    uses.  */
 155 enum c_typespec_kind {
 156   /* No typespec.  This appears only in struct c_declspec.  */
 157   ctsk_none,
 158   /* A reserved keyword type specifier.  */
 159   ctsk_resword,
 160   /* A reference to a tag, previously declared, such as "struct foo".
 161      This includes where the previous declaration was as a different
 162      kind of tag, in which case this is only valid if shadowing that
 163      tag in an inner scope.  */
 164   ctsk_tagref,
 165   /* A reference to a tag, not previously declared in a visible
 166      scope.  */
 167   ctsk_tagfirstref,
 168   /* A definition of a tag such as "struct foo { int a; }".  */
 169   ctsk_tagdef,
 170   /* A typedef name.  */
 171   ctsk_typedef,
 172   /* An ObjC-specific kind of type specifier.  */
 173   ctsk_objc,
 174   /* A typeof specifier, or _Atomic ( type-name ).  */
 175   ctsk_typeof
 176 };
 177
 178 /* A type specifier: this structure is created in the parser and
 179    passed to declspecs_add_type only.  */
 180 struct c_typespec {
 181   /* What kind of type specifier this is.  */
 182   enum c_typespec_kind kind;
 183   /* Whether the expression has operands suitable for use in constant
 184      expressions.  */
 185   bool expr_const_operands;
 186   /* The specifier itself.  */
 187   tree spec;
 188   /* An expression to be evaluated before the type specifier, in the
 189      case of typeof specifiers, or NULL otherwise or if no such
 190      expression is required for a particular typeof specifier.  In
 191      particular, when typeof is applied to an expression of variably
 192      modified type, that expression must be evaluated in order to
 193      determine array sizes that form part of the type, but the
 194      expression itself (as opposed to the array sizes) forms no part
 195      of the type and so needs to be recorded separately.  */
 196   tree expr;
 197 };
 198
 199 /* A storage class specifier.  */
 200 enum c_storage_class {
 201   csc_none,
 202   csc_auto,
 203   csc_extern,
 204   csc_register,
 205   csc_static,
 206   csc_typedef
 207 };
 208
 209 /* A type specifier keyword "void", "_Bool", "char", "int", "float",
 210    "double", "_Decimal32", "_Decimal64", "_Decimal128", "_Fract", "_Accum",
 211    or none of these.  */
 212 enum c_typespec_keyword {
 213   cts_none,
 214   cts_void,
 215   cts_bool,
 216   cts_char,
 217   cts_int,
 218   cts_float,
 219   cts_int_n,
 220   cts_double,
 221   cts_dfloat32,
 222   cts_dfloat64,
 223   cts_dfloat128,
 224   cts_fract,
 225   cts_accum,
 226   cts_auto_type
 227 };
 228
 229 /* This enum lists all the possible declarator specifiers, storage
 230    class or attribute that a user can write.  There is at least one
 231    enumerator per possible declarator specifier in the struct
 232    c_declspecs below.
 233
 234    It is used to index the array of declspec locations in struct
 235    c_declspecs.  */
 236 enum c_declspec_word {
 237   cdw_typespec /* A catch-all for a typespec.  */,
 238   cdw_storage_class  /* A catch-all for a storage class */,
 239   cdw_attributes,
 240   cdw_typedef,
 241   cdw_explicit_signed,
 242   cdw_deprecated,
 243   cdw_default_int,
 244   cdw_long,
 245   cdw_long_long,
 246   cdw_short,
 247   cdw_signed,
 248   cdw_unsigned,
 249   cdw_complex,
 250   cdw_inline,
 251   cdw_noreturn,
 252   cdw_thread,
 253   cdw_const,
 254   cdw_volatile,
 255   cdw_restrict,
 256   cdw_saturating,
 257   cdw_alignas,
 258   cdw_address_space,
 259   cdw_number_of_elements /* This one must always be the last
 260                             enumerator.  */
 261 };
 262
 263 /* A sequence of declaration specifiers in C.  When a new declaration
 264    specifier is added, please update the enum c_declspec_word above
 265    accordingly.  */
 266 struct c_declspecs {
 267   source_location locations[cdw_number_of_elements];
 268   /* The type specified, if a single type specifier such as a struct,
 269      union or enum specifier, typedef name or typeof specifies the
 270      whole type, or NULL_TREE if none or a keyword such as "void" or
 271      "char" is used.  Does not include qualifiers.  */
 272   tree type;
 273   /* Any expression to be evaluated before the type, from a typeof
 274      specifier.  */
 275   tree expr;
 276   /* The attributes from a typedef decl.  */
 277   tree decl_attr;
 278   /* When parsing, the attributes.  Outside the parser, this will be
 279      NULL; attributes (possibly from multiple lists) will be passed
 280      separately.  */
 281   tree attrs;
 282   /* The base-2 log of the greatest alignment required by an _Alignas
 283      specifier, in bytes, or -1 if no such specifiers with nonzero
 284      alignment.  */
 285   int align_log;
 286   /* For the __intN declspec, this stores the index into the int_n_* arrays.  */
 287   int int_n_idx;
 288   /* The storage class specifier, or csc_none if none.  */
 289   enum c_storage_class storage_class;
 290   /* Any type specifier keyword used such as "int", not reflecting
 291      modifiers such as "short", or cts_none if none.  */
 292   ENUM_BITFIELD (c_typespec_keyword) typespec_word : 8;
 293   /* The kind of type specifier if one has been seen, ctsk_none
 294      otherwise.  */
 295   ENUM_BITFIELD (c_typespec_kind) typespec_kind : 3;
 296   /* Whether any expressions in typeof specifiers may appear in
 297      constant expressions.  */
 298   BOOL_BITFIELD expr_const_operands : 1;
 299   /* Whether any declaration specifiers have been seen at all.  */
 300   BOOL_BITFIELD declspecs_seen_p : 1;
 301   /* Whether something other than a storage class specifier or
 302      attribute has been seen.  This is used to warn for the
 303      obsolescent usage of storage class specifiers other than at the
 304      start of the list.  (Doing this properly would require function
 305      specifiers to be handled separately from storage class
 306      specifiers.)  */
 307   BOOL_BITFIELD non_sc_seen_p : 1;
 308   /* Whether the type is specified by a typedef or typeof name.  */
 309   BOOL_BITFIELD typedef_p : 1;
 310   /* Whether the type is explicitly "signed" or specified by a typedef
 311      whose type is explicitly "signed".  */
 312   BOOL_BITFIELD explicit_signed_p : 1;
 313   /* Whether the specifiers include a deprecated typedef.  */
 314   BOOL_BITFIELD deprecated_p : 1;
 315   /* Whether the type defaulted to "int" because there were no type
 316      specifiers.  */
 317   BOOL_BITFIELD default_int_p : 1;
 318   /* Whether "long" was specified.  */
 319   BOOL_BITFIELD long_p : 1;
 320   /* Whether "long" was specified more than once.  */
 321   BOOL_BITFIELD long_long_p : 1;
 322   /* Whether "short" was specified.  */
 323   BOOL_BITFIELD short_p : 1;
 324   /* Whether "signed" was specified.  */
 325   BOOL_BITFIELD signed_p : 1;
 326   /* Whether "unsigned" was specified.  */
 327   BOOL_BITFIELD unsigned_p : 1;
 328   /* Whether "complex" was specified.  */
 329   BOOL_BITFIELD complex_p : 1;
 330   /* Whether "inline" was specified.  */
 331   BOOL_BITFIELD inline_p : 1;
 332   /* Whether "_Noreturn" was speciied.  */
 333   BOOL_BITFIELD noreturn_p : 1;
 334   /* Whether "__thread" or "_Thread_local" was specified.  */
 335   BOOL_BITFIELD thread_p : 1;
 336   /* Whether "__thread" rather than "_Thread_local" was specified.  */
 337   BOOL_BITFIELD thread_gnu_p : 1;
 338   /* Whether "const" was specified.  */
 339   BOOL_BITFIELD const_p : 1;
 340   /* Whether "volatile" was specified.  */
 341   BOOL_BITFIELD volatile_p : 1;
 342   /* Whether "restrict" was specified.  */
 343   BOOL_BITFIELD restrict_p : 1;
 344   /* Whether "_Atomic" was specified.  */
 345   BOOL_BITFIELD atomic_p : 1;
 346   /* Whether "_Sat" was specified.  */
 347   BOOL_BITFIELD saturating_p : 1;
 348   /* Whether any alignment specifier (even with zero alignment) was
 349      specified.  */
 350   BOOL_BITFIELD alignas_p : 1;
 351   /* The address space that the declaration belongs to.  */
 352   addr_space_t address_space;
 353 };
 354
 355 /* The various kinds of declarators in C.  */
 356 enum c_declarator_kind {
 357   /* An identifier.  */
 358   cdk_id,
 359   /* A function.  */
 360   cdk_function,
 361   /* An array.  */
 362   cdk_array,
 363   /* A pointer.  */
 364   cdk_pointer,
 365   /* Parenthesized declarator with nested attributes.  */
 366   cdk_attrs
 367 };
 368
 369 struct c_arg_tag {
 370   /* The argument name.  */
 371   tree id;
 372   /* The type of the argument.  */
 373   tree type;
 374 };
 375
 376
 377 /* Information about the parameters in a function declarator.  */
 378 struct c_arg_info {
 379   /* A list of parameter decls.  */
 380   tree parms;
 381   /* A list of structure, union and enum tags defined.  */
 382   vec<c_arg_tag, va_gc> *tags;
 383   /* A list of argument types to go in the FUNCTION_TYPE.  */
 384   tree types;
 385   /* A list of non-parameter decls (notably enumeration constants)
 386      defined with the parameters.  */
 387   tree others;
 388   /* A compound expression of VLA sizes from the parameters, or NULL.
 389      In a function definition, these are used to ensure that
 390      side-effects in sizes of arrays converted to pointers (such as a
 391      parameter int i[n++]) take place; otherwise, they are
 392      ignored.  */
 393   tree pending_sizes;
 394   /* True when these arguments had [*].  */
 395   BOOL_BITFIELD had_vla_unspec : 1;
 396 };
 397
 398 /* A declarator.  */
 399 struct c_declarator {
 400   /* The kind of declarator.  */
 401   enum c_declarator_kind kind;
 402   location_t id_loc; /* Currently only set for cdk_id, cdk_array. */
 403   /* Except for cdk_id, the contained declarator.  For cdk_id, NULL.  */
 404   struct c_declarator *declarator;
 405   union {
 406     /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
 407        declarator.  */
 408     tree id;
 409     /* For functions.  */
 410     struct c_arg_info *arg_info;
 411     /* For arrays.  */
 412     struct {
 413       /* The array dimension, or NULL for [] and [*].  */
 414       tree dimen;
 415       /* The qualifiers inside [].  */
 416       int quals;
 417       /* The attributes (currently ignored) inside [].  */
 418       tree attrs;
 419       /* Whether [static] was used.  */
 420       BOOL_BITFIELD static_p : 1;
 421       /* Whether [*] was used.  */
 422       BOOL_BITFIELD vla_unspec_p : 1;
 423     } array;
 424     /* For pointers, the qualifiers on the pointer type.  */
 425     int pointer_quals;
 426     /* For attributes.  */
 427     tree attrs;
 428   } u;
 429 };
 430
 431 /* A type name.  */
 432 struct c_type_name {
 433   /* The declaration specifiers.  */
 434   struct c_declspecs *specs;
 435   /* The declarator.  */
 436   struct c_declarator *declarator;
 437 };
 438
 439 /* A parameter.  */
 440 struct c_parm {
 441   /* The declaration specifiers, minus any prefix attributes.  */
 442   struct c_declspecs *specs;
 443   /* The attributes.  */
 444   tree attrs;
 445   /* The declarator.  */
 446   struct c_declarator *declarator;
 447 };
 448
 449 /* Used when parsing an enum.  Initialized by start_enum.  */
 450 struct c_enum_contents
 451 {
 452   /* While defining an enum type, this is 1 plus the last enumerator
 453      constant value.  */
 454   tree enum_next_value;
 455
 456   /* Nonzero means that there was overflow computing enum_next_value.  */
 457   int enum_overflow;
 458 };
 459
 460 /* A type of reference to a static identifier in an inline
 461    function.  */
 462 enum c_inline_static_type {
 463   /* Identifier with internal linkage used in function that may be an
 464      inline definition (i.e., file-scope static).  */
 465   csi_internal,
 466   /* Modifiable object with static storage duration defined in
 467      function that may be an inline definition (i.e., local
 468      static).  */
 469   csi_modifiable
 470 };
 471
 472 \f
 473 /* in c-parser.c */
 474 extern void c_parse_init (void);
 475
 476 /* in c-aux-info.c */
 477 extern void gen_aux_info_record (tree, int, int, int);
 478
 479 /* in c-decl.c */
 480 struct c_spot_bindings;
 481 struct c_struct_parse_info;
 482 extern struct obstack parser_obstack;
 483 extern tree c_break_label;
 484 extern tree c_cont_label;
 485
 486 extern bool global_bindings_p (void);
 487 extern void push_scope (void);
 488 extern tree pop_scope (void);
 489 extern void c_bindings_start_stmt_expr (struct c_spot_bindings *);
 490 extern void c_bindings_end_stmt_expr (struct c_spot_bindings *);
 491
 492 extern void record_inline_static (location_t, tree, tree,
 493                                   enum c_inline_static_type);
 494 extern void c_init_decl_processing (void);
 495 extern void c_print_identifier (FILE *, tree, int);
 496 extern int quals_from_declspecs (const struct c_declspecs *);
 497 extern struct c_declarator *build_array_declarator (location_t, tree,
 498                                                     struct c_declspecs *,
 499                                                     bool, bool);
 500 extern tree build_enumerator (location_t, location_t, struct c_enum_contents *,
 501                               tree, tree);
 502 extern tree check_for_loop_decls (location_t, bool);
 503 extern void mark_forward_parm_decls (void);
 504 extern void declare_parm_level (void);
 505 extern void undeclared_variable (location_t, tree);
 506 extern tree lookup_label_for_goto (location_t, tree);
 507 extern tree declare_label (tree);
 508 extern tree define_label (location_t, tree);
 509 extern struct c_spot_bindings *c_get_switch_bindings (void);
 510 extern void c_release_switch_bindings (struct c_spot_bindings *);
 511 extern bool c_check_switch_jump_warnings (struct c_spot_bindings *,
 512                                           location_t, location_t);
 513 extern void finish_decl (tree, location_t, tree, tree, tree);
 514 extern tree finish_enum (tree, tree, tree);
 515 extern void finish_function (void);
 516 extern tree finish_struct (location_t, tree, tree, tree,
 517                            struct c_struct_parse_info *);
 518 extern struct c_arg_info *build_arg_info (void);
 519 extern struct c_arg_info *get_parm_info (bool, tree);
 520 extern tree grokfield (location_t, struct c_declarator *,
 521                        struct c_declspecs *, tree, tree *);
 522 extern tree groktypename (struct c_type_name *, tree *, bool *);
 523 extern tree grokparm (const struct c_parm *, tree *);
 524 extern tree implicitly_declare (location_t, tree);
 525 extern void keep_next_level (void);
 526 extern void pending_xref_error (void);
 527 extern void c_push_function_context (void);
 528 extern void c_pop_function_context (void);
 529 extern void push_parm_decl (const struct c_parm *, tree *);
 530 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
 531                                                         struct c_declarator *);
 532 extern tree c_builtin_function (tree);
 533 extern tree c_builtin_function_ext_scope (tree);
 534 extern void shadow_tag (const struct c_declspecs *);
 535 extern void shadow_tag_warned (const struct c_declspecs *, int);
 536 extern tree start_enum (location_t, struct c_enum_contents *, tree);
 537 extern int  start_function (struct c_declspecs *, struct c_declarator *, tree);
 538 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
 539                         tree);
 540 extern tree start_struct (location_t, enum tree_code, tree,
 541                           struct c_struct_parse_info **);
 542 extern void store_parm_decls (void);
 543 extern void store_parm_decls_from (struct c_arg_info *);
 544 extern void temp_store_parm_decls (tree, tree);
 545 extern void temp_pop_parm_decls (void);
 546 extern tree xref_tag (enum tree_code, tree);
 547 extern struct c_typespec parser_xref_tag (location_t, enum tree_code, tree);
 548 extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
 549                                     struct c_declarator *);
 550 extern struct c_declarator *build_attrs_declarator (tree,
 551                                                     struct c_declarator *);
 552 extern struct c_declarator *build_function_declarator (struct c_arg_info *,
 553                                                        struct c_declarator *);
 554 extern struct c_declarator *build_id_declarator (tree);
 555 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
 556                                                      struct c_declarator *);
 557 extern struct c_declspecs *build_null_declspecs (void);
 558 extern struct c_declspecs *declspecs_add_qual (source_location,
 559                                                struct c_declspecs *, tree);
 560 extern struct c_declspecs *declspecs_add_type (location_t,
 561                                                struct c_declspecs *,
 562                                                struct c_typespec);
 563 extern struct c_declspecs *declspecs_add_scspec (source_location,
 564                                                  struct c_declspecs *, tree);
 565 extern struct c_declspecs *declspecs_add_attrs (source_location,
 566                                                 struct c_declspecs *, tree);
 567 extern struct c_declspecs *declspecs_add_addrspace (source_location,
 568                                                     struct c_declspecs *,
 569                                                     addr_space_t);
 570 extern struct c_declspecs *declspecs_add_alignas (source_location,
 571                                                   struct c_declspecs *, tree);
 572 extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
 573
 574 /* in c-objc-common.c */
 575 extern bool c_objc_common_init (void);
 576 extern bool c_missing_noreturn_ok_p (tree);
 577 extern bool c_warn_unused_global_decl (const_tree);
 578 extern void c_initialize_diagnostics (diagnostic_context *);
 579 extern bool c_vla_unspec_p (tree x, tree fn);
 580
 581 /* in c-typeck.c */
 582 extern int in_alignof;
 583 extern int in_sizeof;
 584 extern int in_typeof;
 585
 586 extern tree c_last_sizeof_arg;
 587
 588 extern struct c_switch *c_switch_stack;
 589
 590 extern tree c_objc_common_truthvalue_conversion (location_t, tree);
 591 extern tree require_complete_type (tree);
 592 extern int same_translation_unit_p (const_tree, const_tree);
 593 extern int comptypes (tree, tree);
 594 extern int comptypes_check_different_types (tree, tree, bool *);
 595 extern bool c_vla_type_p (const_tree);
 596 extern bool c_mark_addressable (tree);
 597 extern void c_incomplete_type_error (const_tree, const_tree);
 598 extern tree c_type_promotes_to (tree);
 599 extern struct c_expr default_function_array_conversion (location_t,
 600                                                         struct c_expr);
 601 extern struct c_expr default_function_array_read_conversion (location_t,
 602                                                              struct c_expr);
 603 extern struct c_expr convert_lvalue_to_rvalue (location_t, struct c_expr,
 604                                                bool, bool);
 605 extern void mark_exp_read (tree);
 606 extern tree composite_type (tree, tree);
 607 extern tree build_component_ref (location_t, tree, tree);
 608 extern tree build_array_ref (location_t, tree, tree);
 609 extern tree build_external_ref (location_t, tree, int, tree *);
 610 extern void pop_maybe_used (bool);
 611 extern struct c_expr c_expr_sizeof_expr (location_t, struct c_expr);
 612 extern struct c_expr c_expr_sizeof_type (location_t, struct c_type_name *);
 613 extern struct c_expr parser_build_unary_op (location_t, enum tree_code,
 614                                             struct c_expr);
 615 extern struct c_expr parser_build_binary_op (location_t,
 616                                              enum tree_code, struct c_expr,
 617                                              struct c_expr);
 618 extern tree build_conditional_expr (location_t, tree, bool, tree, tree,
 619                                     tree, tree);
 620 extern tree build_compound_expr (location_t, tree, tree);
 621 extern tree c_cast_expr (location_t, struct c_type_name *, tree);
 622 extern tree build_c_cast (location_t, tree, tree);
 623 extern void store_init_value (location_t, tree, tree, tree);
 624 extern void maybe_warn_string_init (location_t, tree, struct c_expr);
 625 extern void start_init (tree, tree, int);
 626 extern void finish_init (void);
 627 extern void really_start_incremental_init (tree);
 628 extern void push_init_level (location_t, int, struct obstack *);
 629 extern struct c_expr pop_init_level (location_t, int, struct obstack *);
 630 extern void set_init_index (location_t, tree, tree, struct obstack *);
 631 extern void set_init_label (location_t, tree, struct obstack *);
 632 extern void process_init_element (location_t, struct c_expr, bool,
 633                                   struct obstack *);
 634 extern tree build_compound_literal (location_t, tree, tree, bool);
 635 extern void check_compound_literal_type (location_t, struct c_type_name *);
 636 extern tree c_start_case (location_t, location_t, tree, bool);
 637 extern void c_finish_case (tree, tree);
 638 extern tree build_asm_expr (location_t, tree, tree, tree, tree, tree, bool);
 639 extern tree build_asm_stmt (tree, tree);
 640 extern int c_types_compatible_p (tree, tree);
 641 extern tree c_begin_compound_stmt (bool);
 642 extern tree c_end_compound_stmt (location_t, tree, bool);
 643 extern void c_finish_if_stmt (location_t, tree, tree, tree, bool);
 644 extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, bool);
 645 extern tree c_begin_stmt_expr (void);
 646 extern tree c_finish_stmt_expr (location_t, tree);
 647 extern tree c_process_expr_stmt (location_t, tree);
 648 extern tree c_finish_expr_stmt (location_t, tree);
 649 extern tree c_finish_return (location_t, tree, tree);
 650 extern tree c_finish_bc_stmt (location_t, tree *, bool);
 651 extern tree c_finish_goto_label (location_t, tree);
 652 extern tree c_finish_goto_ptr (location_t, tree);
 653 extern tree c_expr_to_decl (tree, bool *, bool *);
 654 extern tree c_finish_omp_construct (location_t, enum tree_code, tree, tree);
 655 extern tree c_finish_oacc_data (location_t, tree, tree);
 656 extern tree c_finish_oacc_host_data (location_t, tree, tree);
 657 extern tree c_begin_omp_parallel (void);
 658 extern tree c_finish_omp_parallel (location_t, tree, tree);
 659 extern tree c_begin_omp_task (void);
 660 extern tree c_finish_omp_task (location_t, tree, tree);
 661 extern void c_finish_omp_cancel (location_t, tree);
 662 extern void c_finish_omp_cancellation_point (location_t, tree);
 663 extern tree c_finish_omp_clauses (tree, bool, bool = false);
 664 extern tree c_build_va_arg (location_t, tree, location_t, tree);
 665 extern tree c_finish_transaction (location_t, tree, int);
 666 extern bool c_tree_equal (tree, tree);
 667 extern tree c_build_function_call_vec (location_t, vec<location_t>, tree,
 668                                        vec<tree, va_gc> *, vec<tree, va_gc> *);
 669
 670 /* Set to 0 at beginning of a function definition, set to 1 if
 671    a return statement that specifies a return value is seen.  */
 672
 673 extern int current_function_returns_value;
 674
 675 /* Set to 0 at beginning of a function definition, set to 1 if
 676    a return statement with no argument is seen.  */
 677
 678 extern int current_function_returns_null;
 679
 680 /* Set to 0 at beginning of a function definition, set to 1 if
 681    a call to a noreturn function is seen.  */
 682
 683 extern int current_function_returns_abnormally;
 684
 685 /* In c-decl.c */
 686
 687 /* Tell the binding oracle what kind of binding we are looking for.  */
 688
 689 enum c_oracle_request
 690 {
 691   C_ORACLE_SYMBOL,
 692   C_ORACLE_TAG,
 693   C_ORACLE_LABEL
 694 };
 695
 696 /* If this is non-NULL, then it is a "binding oracle" which can lazily
 697    create bindings when needed by the C compiler.  The oracle is told
 698    the name and type of the binding to create.  It can call pushdecl
 699    or the like to ensure the binding is visible; or do nothing,
 700    leaving the binding untouched.  c-decl.c takes note of when the
 701    oracle has been called and will not call it again if it fails to
 702    create a given binding.  */
 703
 704 typedef void c_binding_oracle_function (enum c_oracle_request, tree identifier);
 705
 706 extern c_binding_oracle_function *c_binding_oracle;
 707
 708 extern void c_finish_incomplete_decl (tree);
 709 extern tree c_omp_reduction_id (enum tree_code, tree);
 710 extern tree c_omp_reduction_decl (tree);
 711 extern tree c_omp_reduction_lookup (tree, tree);
 712 extern tree c_check_omp_declare_reduction_r (tree *, int *, void *);
 713 extern void c_pushtag (location_t, tree, tree);
 714 extern void c_bind (location_t, tree, bool);
 715 extern bool tag_exists_p (enum tree_code, tree);
 716
 717 /* In c-errors.c */
 718 extern void pedwarn_c90 (location_t, int opt, const char *, ...)
 719     ATTRIBUTE_GCC_DIAG(3,4);
 720 extern bool pedwarn_c99 (location_t, int opt, const char *, ...)
 721     ATTRIBUTE_GCC_DIAG(3,4);
 722
 723 extern void
 724 set_c_expr_source_range (c_expr *expr,
 725                          location_t start, location_t finish);
 726
 727 extern void
 728 set_c_expr_source_range (c_expr *expr,
 729                          source_range src_range);
 730
 731 /* In c-fold.c */
 732 extern tree decl_constant_value_for_optimization (tree);
 733
 734 #endif /* ! GCC_C_TREE_H */