gcc/tree-core.h

   1 /* Core data structures for the 'tree' type.
   2    Copyright (C) 1989-2014 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef GCC_TREE_CORE_H
  21 #define GCC_TREE_CORE_H
  22
  23 #include "hashtab.h"
  24 #include "hash-set.h"
  25 #include "machmode.h"
  26 #include "input.h"
  27 #include "statistics.h"
  28 #include "vec.h"
  29 #include "double-int.h"
  30 #include "real.h"
  31 #include "fixed-value.h"
  32 #include "alias.h"
  33 #include "flags.h"
  34 #include "symtab.h"
  35
  36 /* This file contains all the data structures that define the 'tree' type.
  37    There are no accessor macros nor functions in this file. Only the
  38    basic data structures, extern declarations and type definitions.  */
  39
  40 /*---------------------------------------------------------------------------
  41    Forward type declarations.  Mostly to avoid including unnecessary headers
  42 ---------------------------------------------------------------------------*/
  43 struct function;
  44 struct real_value;
  45 struct fixed_value;
  46 struct ptr_info_def;
  47 struct range_info_def;
  48 struct die_struct;
  49
  50
  51 /*---------------------------------------------------------------------------
  52                               #defined constants
  53 ---------------------------------------------------------------------------*/
  54 /* Nonzero if this is a call to a function whose return value depends
  55    solely on its arguments, has no side effects, and does not read
  56    global memory.  This corresponds to TREE_READONLY for function
  57    decls.  */
  58 #define ECF_CONST                 (1 << 0)
  59
  60 /* Nonzero if this is a call to "pure" function (like const function,
  61    but may read memory.  This corresponds to DECL_PURE_P for function
  62    decls.  */
  63 #define ECF_PURE                  (1 << 1)
  64
  65 /* Nonzero if this is ECF_CONST or ECF_PURE but cannot be proven to no
  66    infinite loop.  This corresponds to DECL_LOOPING_CONST_OR_PURE_P
  67    for function decls.*/
  68 #define ECF_LOOPING_CONST_OR_PURE (1 << 2)
  69
  70 /* Nonzero if this call will never return.  */
  71 #define ECF_NORETURN              (1 << 3)
  72
  73 /* Nonzero if this is a call to malloc or a related function.  */
  74 #define ECF_MALLOC                (1 << 4)
  75
  76 /* Nonzero if it is plausible that this is a call to alloca.  */
  77 #define ECF_MAY_BE_ALLOCA         (1 << 5)
  78
  79 /* Nonzero if this is a call to a function that won't throw an exception.  */
  80 #define ECF_NOTHROW               (1 << 6)
  81
  82 /* Nonzero if this is a call to setjmp or a related function.  */
  83 #define ECF_RETURNS_TWICE         (1 << 7)
  84
  85 /* Nonzero if this call replaces the current stack frame.  */
  86 #define ECF_SIBCALL               (1 << 8)
  87
  88 /* Function does not read or write memory (but may have side effects, so
  89    it does not necessarily fit ECF_CONST).  */
  90 #define ECF_NOVOPS                (1 << 9)
  91
  92 /* The function does not lead to calls within current function unit.  */
  93 #define ECF_LEAF                  (1 << 10)
  94
  95 /* Nonzero if this call does not affect transactions.  */
  96 #define ECF_TM_PURE               (1 << 11)
  97
  98 /* Nonzero if this call is into the transaction runtime library.  */
  99 #define ECF_TM_BUILTIN            (1 << 12)
 100
 101 /* Call argument flags.  */
 102 /* Nonzero if the argument is not dereferenced recursively, thus only
 103    directly reachable memory is read or written.  */
 104 #define EAF_DIRECT              (1 << 0)
 105
 106 /* Nonzero if memory reached by the argument is not clobbered.  */
 107 #define EAF_NOCLOBBER           (1 << 1)
 108
 109 /* Nonzero if the argument does not escape.  */
 110 #define EAF_NOESCAPE            (1 << 2)
 111
 112 /* Nonzero if the argument is not used by the function.  */
 113 #define EAF_UNUSED              (1 << 3)
 114
 115 /* Call return flags.  */
 116 /* Mask for the argument number that is returned.  Lower two bits of
 117    the return flags, encodes argument slots zero to three.  */
 118 #define ERF_RETURN_ARG_MASK     (3)
 119
 120 /* Nonzero if the return value is equal to the argument number
 121    flags & ERF_RETURN_ARG_MASK.  */
 122 #define ERF_RETURNS_ARG         (1 << 2)
 123
 124 /* Nonzero if the return value does not alias with anything.  Functions
 125    with the malloc attribute have this set on their return value.  */
 126 #define ERF_NOALIAS             (1 << 3)
 127
 128
 129 /*---------------------------------------------------------------------------
 130                                   Enumerations
 131 ---------------------------------------------------------------------------*/
 132 /* Codes of tree nodes.  */
 133 #define DEFTREECODE(SYM, STRING, TYPE, NARGS)   SYM,
 134 #define END_OF_BASE_TREE_CODES LAST_AND_UNUSED_TREE_CODE,
 135
 136 enum tree_code {
 137 #include "all-tree.def"
 138 MAX_TREE_CODES
 139 };
 140
 141 #undef DEFTREECODE
 142 #undef END_OF_BASE_TREE_CODES
 143
 144 /* Number of language-independent tree codes.  */
 145 #define NUM_TREE_CODES \
 146   ((int) LAST_AND_UNUSED_TREE_CODE)
 147
 148 #define CODE_CONTAINS_STRUCT(CODE, STRUCT) \
 149   (tree_contains_struct[(CODE)][(STRUCT)])
 150
 151
 152 /* Classify which part of the compiler has defined a given builtin function.
 153    Note that we assume below that this is no more than two bits.  */
 154 enum built_in_class {
 155   NOT_BUILT_IN = 0,
 156   BUILT_IN_FRONTEND,
 157   BUILT_IN_MD,
 158   BUILT_IN_NORMAL
 159 };
 160
 161 /* Last marker used for LTO stremaing of built_in_class.  We can not add it
 162    to the enum since we need the enumb to fit in 2 bits.  */
 163 #define BUILT_IN_LAST (BUILT_IN_NORMAL + 1)
 164
 165 /* Codes that identify the various built in functions
 166    so that expand_call can identify them quickly.  */
 167 #define DEF_BUILTIN(ENUM, N, C, T, LT, B, F, NA, AT, IM, COND) ENUM,
 168 enum built_in_function {
 169 #include "builtins.def"
 170
 171   /* Complex division routines in libgcc.  These are done via builtins
 172      because emit_library_call_value can't handle complex values.  */
 173   BUILT_IN_COMPLEX_MUL_MIN,
 174   BUILT_IN_COMPLEX_MUL_MAX
 175     = BUILT_IN_COMPLEX_MUL_MIN
 176       + MAX_MODE_COMPLEX_FLOAT
 177       - MIN_MODE_COMPLEX_FLOAT,
 178
 179   BUILT_IN_COMPLEX_DIV_MIN,
 180   BUILT_IN_COMPLEX_DIV_MAX
 181     = BUILT_IN_COMPLEX_DIV_MIN
 182       + MAX_MODE_COMPLEX_FLOAT
 183       - MIN_MODE_COMPLEX_FLOAT,
 184
 185   /* Upper bound on non-language-specific builtins.  */
 186   END_BUILTINS
 187 };
 188 #undef DEF_BUILTIN
 189
 190 /* Tree code classes.  Each tree_code has an associated code class
 191    represented by a TREE_CODE_CLASS.  */
 192 enum tree_code_class {
 193   tcc_exceptional, /* An exceptional code (fits no category).  */
 194   tcc_constant,    /* A constant.  */
 195   /* Order of tcc_type and tcc_declaration is important.  */
 196   tcc_type,        /* A type object code.  */
 197   tcc_declaration, /* A declaration (also serving as variable refs).  */
 198   tcc_reference,   /* A reference to storage.  */
 199   tcc_comparison,  /* A comparison expression.  */
 200   tcc_unary,       /* A unary arithmetic expression.  */
 201   tcc_binary,      /* A binary arithmetic expression.  */
 202   tcc_statement,   /* A statement expression, which have side effects
 203                       but usually no interesting value.  */
 204   tcc_vl_exp,      /* A function call or other expression with a
 205                       variable-length operand vector.  */
 206   tcc_expression   /* Any other expression.  */
 207 };
 208
 209 /* OMP_CLAUSE codes.  Do not reorder, as this is used to index into
 210    the tables omp_clause_num_ops and omp_clause_code_name.  */
 211 enum omp_clause_code {
 212   /* Clause zero is special-cased inside the parser
 213      (c_parser_omp_variable_list).  */
 214   OMP_CLAUSE_ERROR = 0,
 215
 216   /* OpenMP clause: private (variable_list).  */
 217   OMP_CLAUSE_PRIVATE,
 218
 219   /* OpenMP clause: shared (variable_list).  */
 220   OMP_CLAUSE_SHARED,
 221
 222   /* OpenMP clause: firstprivate (variable_list).  */
 223   OMP_CLAUSE_FIRSTPRIVATE,
 224
 225   /* OpenMP clause: lastprivate (variable_list).  */
 226   OMP_CLAUSE_LASTPRIVATE,
 227
 228   /* OpenMP clause: reduction (operator:variable_list).
 229      OMP_CLAUSE_REDUCTION_CODE: The tree_code of the operator.
 230      Operand 1: OMP_CLAUSE_REDUCTION_INIT: Stmt-list to initialize the var.
 231      Operand 2: OMP_CLAUSE_REDUCTION_MERGE: Stmt-list to merge private var
 232                 into the shared one.
 233      Operand 3: OMP_CLAUSE_REDUCTION_PLACEHOLDER: A dummy VAR_DECL
 234                 placeholder used in OMP_CLAUSE_REDUCTION_{INIT,MERGE}.  */
 235   OMP_CLAUSE_REDUCTION,
 236
 237   /* OpenMP clause: copyin (variable_list).  */
 238   OMP_CLAUSE_COPYIN,
 239
 240   /* OpenMP clause: copyprivate (variable_list).  */
 241   OMP_CLAUSE_COPYPRIVATE,
 242
 243   /* OpenMP clause: linear (variable-list[:linear-step]).  */
 244   OMP_CLAUSE_LINEAR,
 245
 246   /* OpenMP clause: aligned (variable-list[:alignment]).  */
 247   OMP_CLAUSE_ALIGNED,
 248
 249   /* OpenMP clause: depend ({in,out,inout}:variable-list).  */
 250   OMP_CLAUSE_DEPEND,
 251
 252   /* OpenMP clause: uniform (argument-list).  */
 253   OMP_CLAUSE_UNIFORM,
 254
 255   /* OpenMP clause: from (variable-list).  */
 256   OMP_CLAUSE_FROM,
 257
 258   /* OpenMP clause: to (variable-list).  */
 259   OMP_CLAUSE_TO,
 260
 261   /* OpenMP clause: map ({alloc:,to:,from:,tofrom:,}variable-list).  */
 262   OMP_CLAUSE_MAP,
 263
 264   /* Internal clause: temporary for combined loops expansion.  */
 265   OMP_CLAUSE__LOOPTEMP_,
 266
 267   /* OpenMP clause: if (scalar-expression).  */
 268   OMP_CLAUSE_IF,
 269
 270   /* OpenMP clause: num_threads (integer-expression).  */
 271   OMP_CLAUSE_NUM_THREADS,
 272
 273   /* OpenMP clause: schedule.  */
 274   OMP_CLAUSE_SCHEDULE,
 275
 276   /* OpenMP clause: nowait.  */
 277   OMP_CLAUSE_NOWAIT,
 278
 279   /* OpenMP clause: ordered.  */
 280   OMP_CLAUSE_ORDERED,
 281
 282   /* OpenMP clause: default.  */
 283   OMP_CLAUSE_DEFAULT,
 284
 285   /* OpenMP clause: collapse (constant-integer-expression).  */
 286   OMP_CLAUSE_COLLAPSE,
 287
 288   /* OpenMP clause: untied.  */
 289   OMP_CLAUSE_UNTIED,
 290
 291   /* OpenMP clause: final (scalar-expression).  */
 292   OMP_CLAUSE_FINAL,
 293
 294   /* OpenMP clause: mergeable.  */
 295   OMP_CLAUSE_MERGEABLE,
 296
 297   /* OpenMP clause: device (integer-expression).  */
 298   OMP_CLAUSE_DEVICE,
 299
 300   /* OpenMP clause: dist_schedule (static[:chunk-size]).  */
 301   OMP_CLAUSE_DIST_SCHEDULE,
 302
 303   /* OpenMP clause: inbranch.  */
 304   OMP_CLAUSE_INBRANCH,
 305
 306   /* OpenMP clause: notinbranch.  */
 307   OMP_CLAUSE_NOTINBRANCH,
 308
 309   /* OpenMP clause: num_teams(integer-expression).  */
 310   OMP_CLAUSE_NUM_TEAMS,
 311
 312   /* OpenMP clause: thread_limit(integer-expression).  */
 313   OMP_CLAUSE_THREAD_LIMIT,
 314
 315   /* OpenMP clause: proc_bind ({master,close,spread}).  */
 316   OMP_CLAUSE_PROC_BIND,
 317
 318   /* OpenMP clause: safelen (constant-integer-expression).  */
 319   OMP_CLAUSE_SAFELEN,
 320
 321   /* OpenMP clause: simdlen (constant-integer-expression).  */
 322   OMP_CLAUSE_SIMDLEN,
 323
 324   /* OpenMP clause: for.  */
 325   OMP_CLAUSE_FOR,
 326
 327   /* OpenMP clause: parallel.  */
 328   OMP_CLAUSE_PARALLEL,
 329
 330   /* OpenMP clause: sections.  */
 331   OMP_CLAUSE_SECTIONS,
 332
 333   /* OpenMP clause: taskgroup.  */
 334   OMP_CLAUSE_TASKGROUP,
 335
 336   /* Internally used only clause, holding SIMD uid.  */
 337   OMP_CLAUSE__SIMDUID_,
 338
 339   /* Internally used only clause, holding _Cilk_for # of iterations
 340      on OMP_PARALLEL.  */
 341   OMP_CLAUSE__CILK_FOR_COUNT_
 342 };
 343
 344 #undef DEFTREESTRUCT
 345 #define DEFTREESTRUCT(ENUM, NAME) ENUM,
 346 enum tree_node_structure_enum {
 347 #include "treestruct.def"
 348   LAST_TS_ENUM
 349 };
 350 #undef DEFTREESTRUCT
 351
 352 enum omp_clause_schedule_kind {
 353   OMP_CLAUSE_SCHEDULE_STATIC,
 354   OMP_CLAUSE_SCHEDULE_DYNAMIC,
 355   OMP_CLAUSE_SCHEDULE_GUIDED,
 356   OMP_CLAUSE_SCHEDULE_AUTO,
 357   OMP_CLAUSE_SCHEDULE_RUNTIME,
 358   OMP_CLAUSE_SCHEDULE_CILKFOR,
 359   OMP_CLAUSE_SCHEDULE_LAST
 360 };
 361
 362 enum omp_clause_default_kind {
 363   OMP_CLAUSE_DEFAULT_UNSPECIFIED,
 364   OMP_CLAUSE_DEFAULT_SHARED,
 365   OMP_CLAUSE_DEFAULT_NONE,
 366   OMP_CLAUSE_DEFAULT_PRIVATE,
 367   OMP_CLAUSE_DEFAULT_FIRSTPRIVATE,
 368   OMP_CLAUSE_DEFAULT_LAST
 369 };
 370
 371 /* There is a TYPE_QUAL value for each type qualifier.  They can be
 372    combined by bitwise-or to form the complete set of qualifiers for a
 373    type.  */
 374 enum cv_qualifier {
 375   TYPE_UNQUALIFIED   = 0x0,
 376   TYPE_QUAL_CONST    = 0x1,
 377   TYPE_QUAL_VOLATILE = 0x2,
 378   TYPE_QUAL_RESTRICT = 0x4,
 379   TYPE_QUAL_ATOMIC   = 0x8
 380 };
 381
 382 /* Enumerate visibility settings.  */
 383 #ifndef SYMBOL_VISIBILITY_DEFINED
 384 #define SYMBOL_VISIBILITY_DEFINED
 385 enum symbol_visibility {
 386   VISIBILITY_DEFAULT,
 387   VISIBILITY_PROTECTED,
 388   VISIBILITY_HIDDEN,
 389   VISIBILITY_INTERNAL
 390 };
 391 #endif  // SYMBOL_VISIBILITY_DEFINED
 392
 393 /* Standard named or nameless data types of the C compiler.  */
 394 enum tree_index {
 395   TI_ERROR_MARK,
 396   TI_INTQI_TYPE,
 397   TI_INTHI_TYPE,
 398   TI_INTSI_TYPE,
 399   TI_INTDI_TYPE,
 400   TI_INTTI_TYPE,
 401
 402   TI_UINTQI_TYPE,
 403   TI_UINTHI_TYPE,
 404   TI_UINTSI_TYPE,
 405   TI_UINTDI_TYPE,
 406   TI_UINTTI_TYPE,
 407
 408   TI_ATOMICQI_TYPE,
 409   TI_ATOMICHI_TYPE,
 410   TI_ATOMICSI_TYPE,
 411   TI_ATOMICDI_TYPE,
 412   TI_ATOMICTI_TYPE,
 413
 414   TI_UINT16_TYPE,
 415   TI_UINT32_TYPE,
 416   TI_UINT64_TYPE,
 417
 418   TI_VOID,
 419
 420   TI_INTEGER_ZERO,
 421   TI_INTEGER_ONE,
 422   TI_INTEGER_THREE,
 423   TI_INTEGER_MINUS_ONE,
 424   TI_NULL_POINTER,
 425
 426   TI_SIZE_ZERO,
 427   TI_SIZE_ONE,
 428
 429   TI_BITSIZE_ZERO,
 430   TI_BITSIZE_ONE,
 431   TI_BITSIZE_UNIT,
 432
 433   TI_PUBLIC,
 434   TI_PROTECTED,
 435   TI_PRIVATE,
 436
 437   TI_BOOLEAN_FALSE,
 438   TI_BOOLEAN_TRUE,
 439
 440   TI_COMPLEX_INTEGER_TYPE,
 441   TI_COMPLEX_FLOAT_TYPE,
 442   TI_COMPLEX_DOUBLE_TYPE,
 443   TI_COMPLEX_LONG_DOUBLE_TYPE,
 444
 445   TI_FLOAT_TYPE,
 446   TI_DOUBLE_TYPE,
 447   TI_LONG_DOUBLE_TYPE,
 448
 449   TI_FLOAT_PTR_TYPE,
 450   TI_DOUBLE_PTR_TYPE,
 451   TI_LONG_DOUBLE_PTR_TYPE,
 452   TI_INTEGER_PTR_TYPE,
 453
 454   TI_VOID_TYPE,
 455   TI_PTR_TYPE,
 456   TI_CONST_PTR_TYPE,
 457   TI_SIZE_TYPE,
 458   TI_PID_TYPE,
 459   TI_PTRDIFF_TYPE,
 460   TI_VA_LIST_TYPE,
 461   TI_VA_LIST_GPR_COUNTER_FIELD,
 462   TI_VA_LIST_FPR_COUNTER_FIELD,
 463   TI_BOOLEAN_TYPE,
 464   TI_FILEPTR_TYPE,
 465   TI_POINTER_SIZED_TYPE,
 466
 467   TI_DFLOAT32_TYPE,
 468   TI_DFLOAT64_TYPE,
 469   TI_DFLOAT128_TYPE,
 470   TI_DFLOAT32_PTR_TYPE,
 471   TI_DFLOAT64_PTR_TYPE,
 472   TI_DFLOAT128_PTR_TYPE,
 473
 474   TI_VOID_LIST_NODE,
 475
 476   TI_MAIN_IDENTIFIER,
 477
 478   TI_SAT_SFRACT_TYPE,
 479   TI_SAT_FRACT_TYPE,
 480   TI_SAT_LFRACT_TYPE,
 481   TI_SAT_LLFRACT_TYPE,
 482   TI_SAT_USFRACT_TYPE,
 483   TI_SAT_UFRACT_TYPE,
 484   TI_SAT_ULFRACT_TYPE,
 485   TI_SAT_ULLFRACT_TYPE,
 486   TI_SFRACT_TYPE,
 487   TI_FRACT_TYPE,
 488   TI_LFRACT_TYPE,
 489   TI_LLFRACT_TYPE,
 490   TI_USFRACT_TYPE,
 491   TI_UFRACT_TYPE,
 492   TI_ULFRACT_TYPE,
 493   TI_ULLFRACT_TYPE,
 494   TI_SAT_SACCUM_TYPE,
 495   TI_SAT_ACCUM_TYPE,
 496   TI_SAT_LACCUM_TYPE,
 497   TI_SAT_LLACCUM_TYPE,
 498   TI_SAT_USACCUM_TYPE,
 499   TI_SAT_UACCUM_TYPE,
 500   TI_SAT_ULACCUM_TYPE,
 501   TI_SAT_ULLACCUM_TYPE,
 502   TI_SACCUM_TYPE,
 503   TI_ACCUM_TYPE,
 504   TI_LACCUM_TYPE,
 505   TI_LLACCUM_TYPE,
 506   TI_USACCUM_TYPE,
 507   TI_UACCUM_TYPE,
 508   TI_ULACCUM_TYPE,
 509   TI_ULLACCUM_TYPE,
 510   TI_QQ_TYPE,
 511   TI_HQ_TYPE,
 512   TI_SQ_TYPE,
 513   TI_DQ_TYPE,
 514   TI_TQ_TYPE,
 515   TI_UQQ_TYPE,
 516   TI_UHQ_TYPE,
 517   TI_USQ_TYPE,
 518   TI_UDQ_TYPE,
 519   TI_UTQ_TYPE,
 520   TI_SAT_QQ_TYPE,
 521   TI_SAT_HQ_TYPE,
 522   TI_SAT_SQ_TYPE,
 523   TI_SAT_DQ_TYPE,
 524   TI_SAT_TQ_TYPE,
 525   TI_SAT_UQQ_TYPE,
 526   TI_SAT_UHQ_TYPE,
 527   TI_SAT_USQ_TYPE,
 528   TI_SAT_UDQ_TYPE,
 529   TI_SAT_UTQ_TYPE,
 530   TI_HA_TYPE,
 531   TI_SA_TYPE,
 532   TI_DA_TYPE,
 533   TI_TA_TYPE,
 534   TI_UHA_TYPE,
 535   TI_USA_TYPE,
 536   TI_UDA_TYPE,
 537   TI_UTA_TYPE,
 538   TI_SAT_HA_TYPE,
 539   TI_SAT_SA_TYPE,
 540   TI_SAT_DA_TYPE,
 541   TI_SAT_TA_TYPE,
 542   TI_SAT_UHA_TYPE,
 543   TI_SAT_USA_TYPE,
 544   TI_SAT_UDA_TYPE,
 545   TI_SAT_UTA_TYPE,
 546
 547   TI_OPTIMIZATION_DEFAULT,
 548   TI_OPTIMIZATION_CURRENT,
 549   TI_TARGET_OPTION_DEFAULT,
 550   TI_TARGET_OPTION_CURRENT,
 551   TI_CURRENT_TARGET_PRAGMA,
 552   TI_CURRENT_OPTIMIZE_PRAGMA,
 553
 554   TI_MAX
 555 };
 556
 557 /* An enumeration of the standard C integer types.  These must be
 558    ordered so that shorter types appear before longer ones, and so
 559    that signed types appear before unsigned ones, for the correct
 560    functioning of interpret_integer() in c-lex.c.  */
 561 enum integer_type_kind {
 562   itk_char,
 563   itk_signed_char,
 564   itk_unsigned_char,
 565   itk_short,
 566   itk_unsigned_short,
 567   itk_int,
 568   itk_unsigned_int,
 569   itk_long,
 570   itk_unsigned_long,
 571   itk_long_long,
 572   itk_unsigned_long_long,
 573
 574   itk_intN_0,
 575   itk_unsigned_intN_0,
 576   itk_intN_1,
 577   itk_unsigned_intN_1,
 578   itk_intN_2,
 579   itk_unsigned_intN_2,
 580   itk_intN_3,
 581   itk_unsigned_intN_3,
 582
 583   itk_none
 584 };
 585
 586 /* A pointer-to-function member type looks like:
 587
 588      struct {
 589        __P __pfn;
 590        ptrdiff_t __delta;
 591      };
 592
 593    If __pfn is NULL, it is a NULL pointer-to-member-function.
 594
 595    (Because the vtable is always the first thing in the object, we
 596    don't need its offset.)  If the function is virtual, then PFN is
 597    one plus twice the index into the vtable; otherwise, it is just a
 598    pointer to the function.
 599
 600    Unfortunately, using the lowest bit of PFN doesn't work in
 601    architectures that don't impose alignment requirements on function
 602    addresses, or that use the lowest bit to tell one ISA from another,
 603    for example.  For such architectures, we use the lowest bit of
 604    DELTA instead of the lowest bit of the PFN, and DELTA will be
 605    multiplied by 2.  */
 606 enum ptrmemfunc_vbit_where_t {
 607   ptrmemfunc_vbit_in_pfn,
 608   ptrmemfunc_vbit_in_delta
 609 };
 610
 611 /* Flags that may be passed in the third argument of decl_attributes, and
 612    to handler functions for attributes.  */
 613 enum attribute_flags {
 614   /* The type passed in is the type of a DECL, and any attributes that
 615      should be passed in again to be applied to the DECL rather than the
 616      type should be returned.  */
 617   ATTR_FLAG_DECL_NEXT = 1,
 618   /* The type passed in is a function return type, and any attributes that
 619      should be passed in again to be applied to the function type rather
 620      than the return type should be returned.  */
 621   ATTR_FLAG_FUNCTION_NEXT = 2,
 622   /* The type passed in is an array element type, and any attributes that
 623      should be passed in again to be applied to the array type rather
 624      than the element type should be returned.  */
 625   ATTR_FLAG_ARRAY_NEXT = 4,
 626   /* The type passed in is a structure, union or enumeration type being
 627      created, and should be modified in place.  */
 628   ATTR_FLAG_TYPE_IN_PLACE = 8,
 629   /* The attributes are being applied by default to a library function whose
 630      name indicates known behavior, and should be silently ignored if they
 631      are not in fact compatible with the function type.  */
 632   ATTR_FLAG_BUILT_IN = 16,
 633   /* A given attribute has been parsed as a C++-11 attribute.  */
 634   ATTR_FLAG_CXX11 = 32
 635 };
 636
 637 /* Types used to represent sizes.  */
 638 enum size_type_kind {
 639   stk_sizetype,         /* Normal representation of sizes in bytes.  */
 640   stk_ssizetype,        /* Signed representation of sizes in bytes.  */
 641   stk_bitsizetype,      /* Normal representation of sizes in bits.  */
 642   stk_sbitsizetype,     /* Signed representation of sizes in bits.  */
 643   stk_type_kind_last
 644 };
 645
 646 enum operand_equal_flag {
 647   OEP_ONLY_CONST = 1,
 648   OEP_PURE_SAME = 2,
 649   OEP_CONSTANT_ADDRESS_OF = 4
 650 };
 651
 652 /* Enum and arrays used for tree allocation stats.
 653    Keep in sync with tree.c:tree_node_kind_names.  */
 654 enum tree_node_kind {
 655   d_kind,
 656   t_kind,
 657   b_kind,
 658   s_kind,
 659   r_kind,
 660   e_kind,
 661   c_kind,
 662   id_kind,
 663   vec_kind,
 664   binfo_kind,
 665   ssa_name_kind,
 666   constr_kind,
 667   x_kind,
 668   lang_decl,
 669   lang_type,
 670   omp_clause_kind,
 671   all_kinds
 672 };
 673
 674 enum annot_expr_kind {
 675   annot_expr_ivdep_kind,
 676   annot_expr_no_vector_kind,
 677   annot_expr_vector_kind,
 678   annot_expr_kind_last
 679 };
 680
 681 /* Internal functions.  */
 682 enum internal_fn {
 683 #define DEF_INTERNAL_FN(CODE, FLAGS, FNSPEC) IFN_##CODE,
 684 #include "internal-fn.def"
 685 #undef DEF_INTERNAL_FN
 686   IFN_LAST
 687 };
 688
 689 /*---------------------------------------------------------------------------
 690                                 Type definitions
 691 ---------------------------------------------------------------------------*/
 692 /* When processing aliases at the symbol table level, we need the
 693    declaration of target. For this reason we need to queue aliases and
 694    process them after all declarations has been produced.  */
 695 struct GTY(()) alias_pair {
 696   tree decl;
 697   tree target;
 698 };
 699
 700 /* An initialization priority.  */
 701 typedef unsigned short priority_type;
 702
 703 /* The type of a callback function for walking over tree structure.  */
 704 typedef tree (*walk_tree_fn) (tree *, int *, void *);
 705
 706 /* The type of a callback function that represents a custom walk_tree.  */
 707 typedef tree (*walk_tree_lh) (tree *, int *, tree (*) (tree *, int *, void *),
 708                               void *, hash_set<tree> *);
 709
 710
 711 /*---------------------------------------------------------------------------
 712                               Main data structures
 713 ---------------------------------------------------------------------------*/
 714 /* A tree node can represent a data type, a variable, an expression
 715    or a statement.  Each node has a TREE_CODE which says what kind of
 716    thing it represents.  Some common codes are:
 717    INTEGER_TYPE -- represents a type of integers.
 718    ARRAY_TYPE -- represents a type of pointer.
 719    VAR_DECL -- represents a declared variable.
 720    INTEGER_CST -- represents a constant integer value.
 721    PLUS_EXPR -- represents a sum (an expression).
 722
 723    As for the contents of a tree node: there are some fields
 724    that all nodes share.  Each TREE_CODE has various special-purpose
 725    fields as well.  The fields of a node are never accessed directly,
 726    always through accessor macros.  */
 727
 728 /* Every kind of tree node starts with this structure,
 729    so all nodes have these fields.
 730
 731    See the accessor macros, defined below, for documentation of the
 732    fields, and the table below which connects the fields and the
 733    accessor macros.  */
 734
 735 struct GTY(()) tree_base {
 736   ENUM_BITFIELD(tree_code) code : 16;
 737
 738   unsigned side_effects_flag : 1;
 739   unsigned constant_flag : 1;
 740   unsigned addressable_flag : 1;
 741   unsigned volatile_flag : 1;
 742   unsigned readonly_flag : 1;
 743   unsigned asm_written_flag: 1;
 744   unsigned nowarning_flag : 1;
 745   unsigned visited : 1;
 746
 747   unsigned used_flag : 1;
 748   unsigned nothrow_flag : 1;
 749   unsigned static_flag : 1;
 750   unsigned public_flag : 1;
 751   unsigned private_flag : 1;
 752   unsigned protected_flag : 1;
 753   unsigned deprecated_flag : 1;
 754   unsigned default_def_flag : 1;
 755
 756   union {
 757     /* The bits in the following structure should only be used with
 758        accessor macros that constrain inputs with tree checking.  */
 759     struct {
 760       unsigned lang_flag_0 : 1;
 761       unsigned lang_flag_1 : 1;
 762       unsigned lang_flag_2 : 1;
 763       unsigned lang_flag_3 : 1;
 764       unsigned lang_flag_4 : 1;
 765       unsigned lang_flag_5 : 1;
 766       unsigned lang_flag_6 : 1;
 767       unsigned saturating_flag : 1;
 768
 769       unsigned unsigned_flag : 1;
 770       unsigned packed_flag : 1;
 771       unsigned user_align : 1;
 772       unsigned nameless_flag : 1;
 773       unsigned atomic_flag : 1;
 774       unsigned spare0 : 3;
 775
 776       unsigned spare1 : 8;
 777
 778       /* This field is only used with TREE_TYPE nodes; the only reason it is
 779          present in tree_base instead of tree_type is to save space.  The size
 780          of the field must be large enough to hold addr_space_t values.  */
 781       unsigned address_space : 8;
 782     } bits;
 783
 784     /* The following fields are present in tree_base to save space.  The
 785        nodes using them do not require any of the flags above and so can
 786        make better use of the 4-byte sized word.  */
 787
 788     /* The number of HOST_WIDE_INTs in an INTEGER_CST.  */
 789     struct {
 790       /* The number of HOST_WIDE_INTs if the INTEGER_CST is accessed in
 791          its native precision.  */
 792       unsigned char unextended;
 793
 794       /* The number of HOST_WIDE_INTs if the INTEGER_CST is extended to
 795          wider precisions based on its TYPE_SIGN.  */
 796       unsigned char extended;
 797
 798       /* The number of HOST_WIDE_INTs if the INTEGER_CST is accessed in
 799          offset_int precision, with smaller integers being extended
 800          according to their TYPE_SIGN.  This is equal to one of the two
 801          fields above but is cached for speed.  */
 802       unsigned char offset;
 803     } int_length;
 804
 805     /* VEC length.  This field is only used with TREE_VEC.  */
 806     int length;
 807
 808     /* SSA version number.  This field is only used with SSA_NAME.  */
 809     unsigned int version;
 810
 811     /* Internal function code.  */
 812     enum internal_fn ifn;
 813   } GTY((skip(""))) u;
 814 };
 815
 816 /* The following table lists the uses of each of the above flags and
 817    for which types of nodes they are defined.
 818
 819    addressable_flag:
 820
 821        TREE_ADDRESSABLE in
 822            VAR_DECL, PARM_DECL, RESULT_DECL, FUNCTION_DECL, LABEL_DECL
 823            SSA_NAME
 824            all types
 825            CONSTRUCTOR, IDENTIFIER_NODE
 826            STMT_EXPR
 827
 828        CALL_EXPR_TAILCALL in
 829            CALL_EXPR
 830
 831        CASE_LOW_SEEN in
 832            CASE_LABEL_EXPR
 833
 834        PREDICT_EXPR_OUTCOME in
 835            PREDICT_EXPR
 836
 837    static_flag:
 838
 839        TREE_STATIC in
 840            VAR_DECL, FUNCTION_DECL
 841            CONSTRUCTOR
 842
 843        TREE_NO_TRAMPOLINE in
 844            ADDR_EXPR
 845
 846        BINFO_VIRTUAL_P in
 847            TREE_BINFO
 848
 849        TREE_SYMBOL_REFERENCED in
 850            IDENTIFIER_NODE
 851
 852        CLEANUP_EH_ONLY in
 853            TARGET_EXPR, WITH_CLEANUP_EXPR
 854
 855        TRY_CATCH_IS_CLEANUP in
 856            TRY_CATCH_EXPR
 857
 858        ASM_INPUT_P in
 859            ASM_EXPR
 860
 861        TYPE_REF_CAN_ALIAS_ALL in
 862            POINTER_TYPE, REFERENCE_TYPE
 863
 864        CASE_HIGH_SEEN in
 865            CASE_LABEL_EXPR
 866
 867        ENUM_IS_SCOPED in
 868            ENUMERAL_TYPE
 869
 870        TRANSACTION_EXPR_OUTER in
 871            TRANSACTION_EXPR
 872
 873        SSA_NAME_ANTI_RANGE_P in
 874            SSA_NAME
 875
 876    public_flag:
 877
 878        TREE_OVERFLOW in
 879            INTEGER_CST, REAL_CST, COMPLEX_CST, VECTOR_CST
 880
 881        TREE_PUBLIC in
 882            VAR_DECL, FUNCTION_DECL
 883            IDENTIFIER_NODE
 884
 885        CONSTRUCTOR_NO_CLEARING in
 886            CONSTRUCTOR
 887
 888        ASM_VOLATILE_P in
 889            ASM_EXPR
 890
 891        CALL_EXPR_VA_ARG_PACK in
 892            CALL_EXPR
 893
 894        TYPE_CACHED_VALUES_P in
 895            all types
 896
 897        SAVE_EXPR_RESOLVED_P in
 898            SAVE_EXPR
 899
 900        OMP_CLAUSE_LASTPRIVATE_FIRSTPRIVATE in
 901            OMP_CLAUSE_LASTPRIVATE
 902
 903        OMP_CLAUSE_PRIVATE_DEBUG in
 904            OMP_CLAUSE_PRIVATE
 905
 906        OMP_CLAUSE_LINEAR_NO_COPYIN in
 907            OMP_CLAUSE_LINEAR
 908
 909        OMP_CLAUSE_MAP_ZERO_BIAS_ARRAY_SECTION in
 910            OMP_CLAUSE_MAP
 911
 912        OMP_CLAUSE_REDUCTION_OMP_ORIG_REF in
 913            OMP_CLAUSE_REDUCTION
 914
 915        TRANSACTION_EXPR_RELAXED in
 916            TRANSACTION_EXPR
 917
 918    private_flag:
 919
 920        TREE_PRIVATE in
 921            all decls
 922
 923        CALL_EXPR_RETURN_SLOT_OPT in
 924            CALL_EXPR
 925
 926        OMP_SECTION_LAST in
 927            OMP_SECTION
 928
 929        OMP_PARALLEL_COMBINED in
 930            OMP_PARALLEL
 931
 932        OMP_ATOMIC_SEQ_CST in
 933            OMP_ATOMIC*
 934
 935        OMP_CLAUSE_PRIVATE_OUTER_REF in
 936            OMP_CLAUSE_PRIVATE
 937
 938        OMP_CLAUSE_LINEAR_NO_COPYOUT in
 939            OMP_CLAUSE_LINEAR
 940
 941        TYPE_REF_IS_RVALUE in
 942            REFERENCE_TYPE
 943
 944        ENUM_IS_OPAQUE in
 945            ENUMERAL_TYPE
 946
 947    protected_flag:
 948
 949        TREE_PROTECTED in
 950            BLOCK
 951            all decls
 952
 953        CALL_FROM_THUNK_P and
 954        CALL_ALLOCA_FOR_VAR_P in
 955            CALL_EXPR
 956
 957        OMP_CLAUSE_LINEAR_VARIABLE_STRIDE in
 958            OMP_CLAUSE_LINEAR
 959
 960    side_effects_flag:
 961
 962        TREE_SIDE_EFFECTS in
 963            all expressions
 964            all decls
 965            all constants
 966
 967        FORCED_LABEL in
 968            LABEL_DECL
 969
 970    volatile_flag:
 971
 972        TREE_THIS_VOLATILE in
 973            all expressions
 974            all decls
 975
 976        TYPE_VOLATILE in
 977            all types
 978
 979    readonly_flag:
 980
 981        TREE_READONLY in
 982            all expressions
 983            all decls
 984
 985        TYPE_READONLY in
 986            all types
 987
 988    constant_flag:
 989
 990        TREE_CONSTANT in
 991            all expressions
 992            all decls
 993            all constants
 994
 995        TYPE_SIZES_GIMPLIFIED in
 996            all types
 997
 998    unsigned_flag:
 999
1000        TYPE_UNSIGNED in
1001            all types
1002
1003        DECL_UNSIGNED in
1004            all decls
1005
1006    asm_written_flag:
1007
1008        TREE_ASM_WRITTEN in
1009            VAR_DECL, FUNCTION_DECL, TYPE_DECL
1010            RECORD_TYPE, UNION_TYPE, QUAL_UNION_TYPE
1011            BLOCK, STRING_CST
1012
1013        SSA_NAME_OCCURS_IN_ABNORMAL_PHI in
1014            SSA_NAME
1015
1016    used_flag:
1017
1018        TREE_USED in
1019            all expressions
1020            all decls
1021            IDENTIFIER_NODE
1022
1023    nothrow_flag:
1024
1025        TREE_NOTHROW in
1026            CALL_EXPR
1027            FUNCTION_DECL
1028
1029        TYPE_ALIGN_OK in
1030            all types
1031
1032        TREE_THIS_NOTRAP in
1033           INDIRECT_REF, MEM_REF, TARGET_MEM_REF, ARRAY_REF, ARRAY_RANGE_REF
1034
1035        SSA_NAME_IN_FREELIST in
1036           SSA_NAME
1037
1038        DECL_NONALIASED in
1039           VAR_DECL
1040
1041    deprecated_flag:
1042
1043        TREE_DEPRECATED in
1044            all decls
1045            all types
1046
1047        IDENTIFIER_TRANSPARENT_ALIAS in
1048            IDENTIFIER_NODE
1049
1050    visited:
1051
1052        TREE_VISITED in
1053            all trees (used liberally by many passes)
1054
1055    saturating_flag:
1056
1057        TYPE_SATURATING in
1058            all types
1059
1060        VAR_DECL_IS_VIRTUAL_OPERAND in
1061            VAR_DECL
1062
1063    nowarning_flag:
1064
1065        TREE_NO_WARNING in
1066            all expressions
1067            all decls
1068
1069        TYPE_ARTIFICIAL in
1070            all types
1071
1072    default_def_flag:
1073
1074        TYPE_VECTOR_OPAQUE in
1075            VECTOR_TYPE
1076
1077        SSA_NAME_IS_DEFAULT_DEF in
1078            SSA_NAME
1079
1080        DECL_NONLOCAL_FRAME in
1081            VAR_DECL
1082
1083        TYPE_FINAL_P in
1084            RECORD_TYPE, UNION_TYPE and QUAL_UNION_TYPE
1085 */
1086
1087 struct GTY(()) tree_typed {
1088   struct tree_base base;
1089   tree type;
1090 };
1091
1092 struct GTY(()) tree_common {
1093   struct tree_typed typed;
1094   tree chain;
1095 };
1096
1097 struct GTY(()) tree_int_cst {
1098   struct tree_typed typed;
1099   HOST_WIDE_INT val[1];
1100 };
1101
1102
1103 struct GTY(()) tree_real_cst {
1104   struct tree_typed typed;
1105   struct real_value * real_cst_ptr;
1106 };
1107
1108 struct GTY(()) tree_fixed_cst {
1109   struct tree_typed typed;
1110   struct fixed_value * fixed_cst_ptr;
1111 };
1112
1113 struct GTY(()) tree_string {
1114   struct tree_typed typed;
1115   int length;
1116   char str[1];
1117 };
1118
1119 struct GTY(()) tree_complex {
1120   struct tree_typed typed;
1121   tree real;
1122   tree imag;
1123 };
1124
1125 struct GTY(()) tree_vector {
1126   struct tree_typed typed;
1127   tree GTY ((length ("TYPE_VECTOR_SUBPARTS (TREE_TYPE ((tree)&%h))"))) elts[1];
1128 };
1129
1130 struct GTY(()) tree_identifier {
1131   struct tree_common common;
1132   struct ht_identifier id;
1133 };
1134
1135 struct GTY(()) tree_list {
1136   struct tree_common common;
1137   tree purpose;
1138   tree value;
1139 };
1140
1141 struct GTY(()) tree_vec {
1142   struct tree_common common;
1143   tree GTY ((length ("TREE_VEC_LENGTH ((tree)&%h)"))) a[1];
1144 };
1145
1146 /* A single element of a CONSTRUCTOR. VALUE holds the actual value of the
1147    element. INDEX can optionally design the position of VALUE: in arrays,
1148    it is the index where VALUE has to be placed; in structures, it is the
1149    FIELD_DECL of the member.  */
1150 struct GTY(()) constructor_elt {
1151   tree index;
1152   tree value;
1153 };
1154
1155 struct GTY(()) tree_constructor {
1156   struct tree_typed typed;
1157   vec<constructor_elt, va_gc> *elts;
1158 };
1159
1160 enum omp_clause_depend_kind
1161 {
1162   OMP_CLAUSE_DEPEND_IN,
1163   OMP_CLAUSE_DEPEND_OUT,
1164   OMP_CLAUSE_DEPEND_INOUT,
1165   OMP_CLAUSE_DEPEND_LAST
1166 };
1167
1168 enum omp_clause_map_kind
1169 {
1170   OMP_CLAUSE_MAP_ALLOC,
1171   OMP_CLAUSE_MAP_TO,
1172   OMP_CLAUSE_MAP_FROM,
1173   OMP_CLAUSE_MAP_TOFROM,
1174   /* The following kind is an internal only map kind, used for pointer based
1175      array sections.  OMP_CLAUSE_SIZE for these is not the pointer size,
1176      which is implicitly POINTER_SIZE_UNITS, but the bias.  */
1177   OMP_CLAUSE_MAP_POINTER,
1178   /* Also internal, behaves like OMP_CLAUS_MAP_TO, but additionally any
1179      OMP_CLAUSE_MAP_POINTER records consecutive after it which have addresses
1180      falling into that range will not be ignored if OMP_CLAUSE_MAP_TO_PSET
1181      wasn't mapped already.  */
1182   OMP_CLAUSE_MAP_TO_PSET,
1183   OMP_CLAUSE_MAP_LAST
1184 };
1185
1186 enum omp_clause_proc_bind_kind
1187 {
1188   /* Numbers should match omp_proc_bind_t enum in omp.h.  */
1189   OMP_CLAUSE_PROC_BIND_FALSE = 0,
1190   OMP_CLAUSE_PROC_BIND_TRUE = 1,
1191   OMP_CLAUSE_PROC_BIND_MASTER = 2,
1192   OMP_CLAUSE_PROC_BIND_CLOSE = 3,
1193   OMP_CLAUSE_PROC_BIND_SPREAD = 4,
1194   OMP_CLAUSE_PROC_BIND_LAST
1195 };
1196
1197 struct GTY(()) tree_exp {
1198   struct tree_typed typed;
1199   location_t locus;
1200   tree GTY ((special ("tree_exp"),
1201              desc ("TREE_CODE ((tree) &%0)")))
1202     operands[1];
1203 };
1204
1205 /* Immediate use linking structure.  This structure is used for maintaining
1206    a doubly linked list of uses of an SSA_NAME.  */
1207 struct GTY(()) ssa_use_operand_t {
1208   struct ssa_use_operand_t* GTY((skip(""))) prev;
1209   struct ssa_use_operand_t* GTY((skip(""))) next;
1210   /* Immediate uses for a given SSA name are maintained as a cyclic
1211      list.  To recognize the root of this list, the location field
1212      needs to point to the original SSA name.  Since statements and
1213      SSA names are of different data types, we need this union.  See
1214      the explanation in struct imm_use_iterator.  */
1215   union { gimple stmt; tree ssa_name; } GTY((skip(""))) loc;
1216   tree *GTY((skip(""))) use;
1217 };
1218
1219 struct GTY(()) tree_ssa_name {
1220   struct tree_typed typed;
1221
1222   /* _DECL wrapped by this SSA name.  */
1223   tree var;
1224
1225   /* Statement that defines this SSA name.  */
1226   gimple def_stmt;
1227
1228   /* Value range information.  */
1229   union ssa_name_info_type {
1230     /* Pointer attributes used for alias analysis.  */
1231     struct GTY ((tag ("0"))) ptr_info_def *ptr_info;
1232     /* Value range attributes used for zero/sign extension elimination.  */
1233     struct GTY ((tag ("1"))) range_info_def *range_info;
1234   } GTY ((desc ("%1.typed.type ?" \
1235                 "!POINTER_TYPE_P (TREE_TYPE ((tree)&%1)) : 2"))) info;
1236
1237   /* Immediate uses list for this SSA_NAME.  */
1238   struct ssa_use_operand_t imm_uses;
1239 };
1240
1241 struct GTY(()) phi_arg_d {
1242   /* imm_use MUST be the first element in struct because we do some
1243      pointer arithmetic with it.  See phi_arg_index_from_use.  */
1244   struct ssa_use_operand_t imm_use;
1245   tree def;
1246   location_t locus;
1247 };
1248
1249 struct GTY(()) tree_omp_clause {
1250   struct tree_common common;
1251   location_t locus;
1252   enum omp_clause_code code;
1253   union omp_clause_subcode {
1254     enum omp_clause_default_kind   default_kind;
1255     enum omp_clause_schedule_kind  schedule_kind;
1256     enum omp_clause_depend_kind    depend_kind;
1257     enum omp_clause_map_kind       map_kind;
1258     enum omp_clause_proc_bind_kind proc_bind_kind;
1259     enum tree_code                 reduction_code;
1260   } GTY ((skip)) subcode;
1261
1262   /* The gimplification of OMP_CLAUSE_REDUCTION_{INIT,MERGE} for omp-low's
1263      usage.  */
1264   gimple_seq gimple_reduction_init;
1265   gimple_seq gimple_reduction_merge;
1266
1267   tree GTY ((length ("omp_clause_num_ops[OMP_CLAUSE_CODE ((tree)&%h)]")))
1268     ops[1];
1269 };
1270
1271 struct GTY(()) tree_block {
1272   struct tree_base base;
1273   tree chain;
1274
1275   unsigned abstract_flag : 1;
1276   unsigned block_num : 31;
1277
1278   location_t locus;
1279   location_t end_locus;
1280
1281   tree vars;
1282   vec<tree, va_gc> *nonlocalized_vars;
1283
1284   tree subblocks;
1285   tree supercontext;
1286   tree abstract_origin;
1287   tree fragment_origin;
1288   tree fragment_chain;
1289 };
1290
1291 struct GTY(()) tree_type_common {
1292   struct tree_common common;
1293   tree size;
1294   tree size_unit;
1295   tree attributes;
1296   unsigned int uid;
1297
1298   unsigned int precision : 10;
1299   unsigned no_force_blk_flag : 1;
1300   unsigned needs_constructing_flag : 1;
1301   unsigned transparent_aggr_flag : 1;
1302   unsigned restrict_flag : 1;
1303   unsigned contains_placeholder_bits : 2;
1304
1305   ENUM_BITFIELD(machine_mode) mode : 8;
1306
1307   unsigned string_flag : 1;
1308   unsigned lang_flag_0 : 1;
1309   unsigned lang_flag_1 : 1;
1310   unsigned lang_flag_2 : 1;
1311   unsigned lang_flag_3 : 1;
1312   unsigned lang_flag_4 : 1;
1313   unsigned lang_flag_5 : 1;
1314   unsigned lang_flag_6 : 1;
1315
1316   unsigned int align;
1317   alias_set_type alias_set;
1318   tree pointer_to;
1319   tree reference_to;
1320   union tree_type_symtab {
1321     int GTY ((tag ("TYPE_SYMTAB_IS_ADDRESS"))) address;
1322     const char * GTY ((tag ("TYPE_SYMTAB_IS_POINTER"))) pointer;
1323     struct die_struct * GTY ((tag ("TYPE_SYMTAB_IS_DIE"))) die;
1324   } GTY ((desc ("debug_hooks->tree_type_symtab_field"))) symtab;
1325   tree canonical;
1326   tree next_variant;
1327   tree main_variant;
1328   tree context;
1329   tree name;
1330 };
1331
1332 struct GTY(()) tree_type_with_lang_specific {
1333   struct tree_type_common common;
1334   /* Points to a structure whose details depend on the language in use.  */
1335   struct lang_type *lang_specific;
1336 };
1337
1338 struct GTY(()) tree_type_non_common {
1339   struct tree_type_with_lang_specific with_lang_specific;
1340   tree values;
1341   tree minval;
1342   tree maxval;
1343   tree binfo;
1344 };
1345
1346 struct GTY (()) tree_binfo {
1347   struct tree_common common;
1348
1349   tree offset;
1350   tree vtable;
1351   tree virtuals;
1352   tree vptr_field;
1353   vec<tree, va_gc> *base_accesses;
1354   tree inheritance;
1355
1356   tree vtt_subvtt;
1357   tree vtt_vptr;
1358
1359   vec<tree, va_gc> base_binfos;
1360 };
1361
1362 struct GTY(()) tree_decl_minimal {
1363   struct tree_common common;
1364   location_t locus;
1365   unsigned int uid;
1366   tree name;
1367   tree context;
1368 };
1369
1370 struct GTY(()) tree_decl_common {
1371   struct tree_decl_minimal common;
1372   tree size;
1373
1374   ENUM_BITFIELD(machine_mode) mode : 8;
1375
1376   unsigned nonlocal_flag : 1;
1377   unsigned virtual_flag : 1;
1378   unsigned ignored_flag : 1;
1379   unsigned abstract_flag : 1;
1380   unsigned artificial_flag : 1;
1381   unsigned preserve_flag: 1;
1382   unsigned debug_expr_is_from : 1;
1383
1384   unsigned lang_flag_0 : 1;
1385   unsigned lang_flag_1 : 1;
1386   unsigned lang_flag_2 : 1;
1387   unsigned lang_flag_3 : 1;
1388   unsigned lang_flag_4 : 1;
1389   unsigned lang_flag_5 : 1;
1390   unsigned lang_flag_6 : 1;
1391   unsigned lang_flag_7 : 1;
1392   unsigned lang_flag_8 : 1;
1393
1394   /* In VAR_DECL and PARM_DECL, this is DECL_REGISTER.  */
1395   unsigned decl_flag_0 : 1;
1396   /* In FIELD_DECL, this is DECL_BIT_FIELD
1397      In VAR_DECL and FUNCTION_DECL, this is DECL_EXTERNAL.
1398      In TYPE_DECL, this is TYPE_DECL_SUPPRESS_DEBUG.  */
1399   unsigned decl_flag_1 : 1;
1400   /* In FIELD_DECL, this is DECL_NONADDRESSABLE_P
1401      In VAR_DECL, PARM_DECL and RESULT_DECL, this is
1402      DECL_HAS_VALUE_EXPR_P.  */
1403   unsigned decl_flag_2 : 1;
1404   /* 1 bit unused.  */
1405   unsigned decl_flag_3 : 1;
1406   /* Logically, these two would go in a theoretical base shared by var and
1407      parm decl. */
1408   unsigned gimple_reg_flag : 1;
1409   /* In VAR_DECL, PARM_DECL and RESULT_DECL, this is DECL_BY_REFERENCE.  */
1410   unsigned decl_by_reference_flag : 1;
1411   /* In a VAR_DECL and PARM_DECL, this is DECL_READ_P.  */
1412   unsigned decl_read_flag : 1;
1413   /* In a VAR_DECL or RESULT_DECL, this is DECL_NONSHAREABLE.  */
1414   unsigned decl_nonshareable_flag : 1;
1415
1416   /* DECL_OFFSET_ALIGN, used only for FIELD_DECLs.  */
1417   unsigned int off_align : 8;
1418
1419   /* 24 bits unused.  */
1420
1421   /* DECL_ALIGN.  It should have the same size as TYPE_ALIGN.  */
1422   unsigned int align;
1423
1424   /* UID for points-to sets, stable over copying from inlining.  */
1425   unsigned int pt_uid;
1426
1427   tree size_unit;
1428   tree initial;
1429   tree attributes;
1430   tree abstract_origin;
1431
1432   /* Points to a structure whose details depend on the language in use.  */
1433   struct lang_decl *lang_specific;
1434 };
1435
1436 struct GTY(()) tree_decl_with_rtl {
1437   struct tree_decl_common common;
1438   rtx rtl;
1439 };
1440
1441 struct GTY(()) tree_field_decl {
1442   struct tree_decl_common common;
1443
1444   tree offset;
1445   tree bit_field_type;
1446   tree qualifier;
1447   tree bit_offset;
1448   tree fcontext;
1449 };
1450
1451 struct GTY(()) tree_label_decl {
1452   struct tree_decl_with_rtl common;
1453   int label_decl_uid;
1454   int eh_landing_pad_nr;
1455 };
1456
1457 struct GTY(()) tree_result_decl {
1458   struct tree_decl_with_rtl common;
1459 };
1460
1461 struct GTY(()) tree_const_decl {
1462   struct tree_decl_common common;
1463 };
1464
1465 struct GTY(()) tree_parm_decl {
1466   struct tree_decl_with_rtl common;
1467   rtx incoming_rtl;
1468 };
1469
1470 struct GTY(()) tree_decl_with_vis {
1471  struct tree_decl_with_rtl common;
1472  tree assembler_name;
1473  struct symtab_node *symtab_node;
1474
1475  /* Belong to VAR_DECL exclusively.  */
1476  unsigned defer_output : 1;
1477  unsigned hard_register : 1;
1478  unsigned common_flag : 1;
1479  unsigned in_text_section : 1;
1480  unsigned in_constant_pool : 1;
1481  unsigned dllimport_flag : 1;
1482  /* Don't belong to VAR_DECL exclusively.  */
1483  unsigned weak_flag : 1;
1484
1485  unsigned seen_in_bind_expr : 1;
1486  unsigned comdat_flag : 1;
1487  /* Used for FUNCTION_DECL, VAR_DECL and in C++ for TYPE_DECL.  */
1488  ENUM_BITFIELD(symbol_visibility) visibility : 2;
1489  unsigned visibility_specified : 1;
1490
1491  /* Belong to FUNCTION_DECL exclusively.  */
1492  unsigned init_priority_p : 1;
1493  /* Used by C++ only.  Might become a generic decl flag.  */
1494  unsigned shadowed_for_var_p : 1;
1495  /* Belong to FUNCTION_DECL exclusively.  */
1496  unsigned cxx_constructor : 1;
1497  /* Belong to FUNCTION_DECL exclusively.  */
1498  unsigned cxx_destructor : 1;
1499  /* Belong to FUNCTION_DECL exclusively.  */
1500  unsigned final : 1;
1501  /* Belong to FUNCTION_DECL exclusively.  */
1502  unsigned regdecl_flag : 1;
1503  /* 14 unused bits. */
1504 };
1505
1506 struct GTY(()) tree_var_decl {
1507   struct tree_decl_with_vis common;
1508 };
1509
1510 struct GTY(()) tree_decl_non_common {
1511   struct tree_decl_with_vis common;
1512   /* Almost all FE's use this.  */
1513   tree result;
1514 };
1515
1516 /* FUNCTION_DECL inherits from DECL_NON_COMMON because of the use of the
1517    arguments/result/saved_tree fields by front ends.   It was either inherit
1518    FUNCTION_DECL from non_common, or inherit non_common from FUNCTION_DECL,
1519    which seemed a bit strange.  */
1520
1521 struct GTY(()) tree_function_decl {
1522   struct tree_decl_non_common common;
1523
1524   struct function *f;
1525
1526   /* Arguments of the function.  */
1527   tree arguments;
1528   /* The personality function. Used for stack unwinding. */
1529   tree personality;
1530
1531   /* Function specific options that are used by this function.  */
1532   tree function_specific_target;        /* target options */
1533   tree function_specific_optimization;  /* optimization options */
1534
1535   /* Generic function body.  */
1536   tree saved_tree;
1537   /* Index within a virtual table.  */
1538   tree vindex;
1539
1540   /* In a FUNCTION_DECL for which DECL_BUILT_IN holds, this is
1541      DECL_FUNCTION_CODE.  Otherwise unused.
1542      ???  The bitfield needs to be able to hold all target function
1543           codes as well.  */
1544   ENUM_BITFIELD(built_in_function) function_code : 12;
1545   ENUM_BITFIELD(built_in_class) built_in_class : 2;
1546
1547   unsigned static_ctor_flag : 1;
1548   unsigned static_dtor_flag : 1;
1549
1550   unsigned uninlinable : 1;
1551   unsigned possibly_inlined : 1;
1552   unsigned novops_flag : 1;
1553   unsigned returns_twice_flag : 1;
1554   unsigned malloc_flag : 1;
1555   unsigned operator_new_flag : 1;
1556   unsigned declared_inline_flag : 1;
1557   unsigned no_inline_warning_flag : 1;
1558
1559   unsigned no_instrument_function_entry_exit : 1;
1560   unsigned no_limit_stack : 1;
1561   unsigned disregard_inline_limits : 1;
1562   unsigned pure_flag : 1;
1563   unsigned looping_const_or_pure_flag : 1;
1564   unsigned has_debug_args_flag : 1;
1565   unsigned tm_clone_flag : 1;
1566   unsigned versioned_function : 1;
1567   /* No bits left.  */
1568 };
1569
1570 struct GTY(()) tree_translation_unit_decl {
1571   struct tree_decl_common common;
1572   /* Source language of this translation unit.  Used for DWARF output.  */
1573   const char * GTY((skip(""))) language;
1574   /* TODO: Non-optimization used to build this translation unit.  */
1575   /* TODO: Root of a partial DWARF tree for global types and decls.  */
1576 };
1577
1578 struct GTY(()) tree_type_decl {
1579   struct tree_decl_non_common common;
1580
1581 };
1582
1583 struct GTY ((chain_next ("%h.next"), chain_prev ("%h.prev"))) tree_statement_list_node
1584  {
1585   struct tree_statement_list_node *prev;
1586   struct tree_statement_list_node *next;
1587   tree stmt;
1588 };
1589
1590 struct GTY(()) tree_statement_list
1591  {
1592   struct tree_typed typed;
1593   struct tree_statement_list_node *head;
1594   struct tree_statement_list_node *tail;
1595 };
1596
1597
1598 /* Optimization options used by a function.  */
1599
1600 struct GTY(()) tree_optimization_option {
1601   struct tree_common common;
1602
1603   /* The optimization options used by the user.  */
1604   struct cl_optimization opts;
1605
1606   /* Target optabs for this set of optimization options.  This is of
1607      type `struct target_optabs *'.  */
1608   void *GTY ((atomic)) optabs;
1609
1610   /* The value of this_target_optabs against which the optabs above were
1611      generated.  */
1612   struct target_optabs *GTY ((skip)) base_optabs;
1613 };
1614
1615 /* Forward declaration, defined in target-globals.h.  */
1616
1617 struct GTY(()) target_globals;
1618
1619 /* Target options used by a function.  */
1620
1621 struct GTY(()) tree_target_option {
1622   struct tree_common common;
1623
1624   /* Target globals for the corresponding target option.  */
1625   struct target_globals *globals;
1626
1627   /* The optimization options used by the user.  */
1628   struct cl_target_option opts;
1629 };
1630
1631 /* Define the overall contents of a tree node.
1632    It may be any of the structures declared above
1633    for various types of node.  */
1634 union GTY ((ptr_alias (union lang_tree_node),
1635             desc ("tree_node_structure (&%h)"), variable_size)) tree_node {
1636   struct tree_base GTY ((tag ("TS_BASE"))) base;
1637   struct tree_typed GTY ((tag ("TS_TYPED"))) typed;
1638   struct tree_common GTY ((tag ("TS_COMMON"))) common;
1639   struct tree_int_cst GTY ((tag ("TS_INT_CST"))) int_cst;
1640   struct tree_real_cst GTY ((tag ("TS_REAL_CST"))) real_cst;
1641   struct tree_fixed_cst GTY ((tag ("TS_FIXED_CST"))) fixed_cst;
1642   struct tree_vector GTY ((tag ("TS_VECTOR"))) vector;
1643   struct tree_string GTY ((tag ("TS_STRING"))) string;
1644   struct tree_complex GTY ((tag ("TS_COMPLEX"))) complex;
1645   struct tree_identifier GTY ((tag ("TS_IDENTIFIER"))) identifier;
1646   struct tree_decl_minimal GTY((tag ("TS_DECL_MINIMAL"))) decl_minimal;
1647   struct tree_decl_common GTY ((tag ("TS_DECL_COMMON"))) decl_common;
1648   struct tree_decl_with_rtl GTY ((tag ("TS_DECL_WRTL"))) decl_with_rtl;
1649   struct tree_decl_non_common  GTY ((tag ("TS_DECL_NON_COMMON")))
1650     decl_non_common;
1651   struct tree_parm_decl  GTY  ((tag ("TS_PARM_DECL"))) parm_decl;
1652   struct tree_decl_with_vis GTY ((tag ("TS_DECL_WITH_VIS"))) decl_with_vis;
1653   struct tree_var_decl GTY ((tag ("TS_VAR_DECL"))) var_decl;
1654   struct tree_field_decl GTY ((tag ("TS_FIELD_DECL"))) field_decl;
1655   struct tree_label_decl GTY ((tag ("TS_LABEL_DECL"))) label_decl;
1656   struct tree_result_decl GTY ((tag ("TS_RESULT_DECL"))) result_decl;
1657   struct tree_const_decl GTY ((tag ("TS_CONST_DECL"))) const_decl;
1658   struct tree_type_decl GTY ((tag ("TS_TYPE_DECL"))) type_decl;
1659   struct tree_function_decl GTY ((tag ("TS_FUNCTION_DECL"))) function_decl;
1660   struct tree_translation_unit_decl GTY ((tag ("TS_TRANSLATION_UNIT_DECL")))
1661     translation_unit_decl;
1662   struct tree_type_common GTY ((tag ("TS_TYPE_COMMON"))) type_common;
1663   struct tree_type_with_lang_specific GTY ((tag ("TS_TYPE_WITH_LANG_SPECIFIC")))
1664     type_with_lang_specific;
1665   struct tree_type_non_common GTY ((tag ("TS_TYPE_NON_COMMON")))
1666     type_non_common;
1667   struct tree_list GTY ((tag ("TS_LIST"))) list;
1668   struct tree_vec GTY ((tag ("TS_VEC"))) vec;
1669   struct tree_exp GTY ((tag ("TS_EXP"))) exp;
1670   struct tree_ssa_name GTY ((tag ("TS_SSA_NAME"))) ssa_name;
1671   struct tree_block GTY ((tag ("TS_BLOCK"))) block;
1672   struct tree_binfo GTY ((tag ("TS_BINFO"))) binfo;
1673   struct tree_statement_list GTY ((tag ("TS_STATEMENT_LIST"))) stmt_list;
1674   struct tree_constructor GTY ((tag ("TS_CONSTRUCTOR"))) constructor;
1675   struct tree_omp_clause GTY ((tag ("TS_OMP_CLAUSE"))) omp_clause;
1676   struct tree_optimization_option GTY ((tag ("TS_OPTIMIZATION"))) optimization;
1677   struct tree_target_option GTY ((tag ("TS_TARGET_OPTION"))) target_option;
1678 };
1679
1680 /* Structure describing an attribute and a function to handle it.  */
1681 struct attribute_spec {
1682   /* The name of the attribute (without any leading or trailing __),
1683      or NULL to mark the end of a table of attributes.  */
1684   const char *name;
1685   /* The minimum length of the list of arguments of the attribute.  */
1686   int min_length;
1687   /* The maximum length of the list of arguments of the attribute
1688      (-1 for no maximum).  */
1689   int max_length;
1690   /* Whether this attribute requires a DECL.  If it does, it will be passed
1691      from types of DECLs, function return types and array element types to
1692      the DECLs, function types and array types respectively; but when
1693      applied to a type in any other circumstances, it will be ignored with
1694      a warning.  (If greater control is desired for a given attribute,
1695      this should be false, and the flags argument to the handler may be
1696      used to gain greater control in that case.)  */
1697   bool decl_required;
1698   /* Whether this attribute requires a type.  If it does, it will be passed
1699      from a DECL to the type of that DECL.  */
1700   bool type_required;
1701   /* Whether this attribute requires a function (or method) type.  If it does,
1702      it will be passed from a function pointer type to the target type,
1703      and from a function return type (which is not itself a function
1704      pointer type) to the function type.  */
1705   bool function_type_required;
1706   /* Function to handle this attribute.  NODE points to the node to which
1707      the attribute is to be applied.  If a DECL, it should be modified in
1708      place; if a TYPE, a copy should be created.  NAME is the name of the
1709      attribute (possibly with leading or trailing __).  ARGS is the TREE_LIST
1710      of the arguments (which may be NULL).  FLAGS gives further information
1711      about the context of the attribute.  Afterwards, the attributes will
1712      be added to the DECL_ATTRIBUTES or TYPE_ATTRIBUTES, as appropriate,
1713      unless *NO_ADD_ATTRS is set to true (which should be done on error,
1714      as well as in any other cases when the attributes should not be added
1715      to the DECL or TYPE).  Depending on FLAGS, any attributes to be
1716      applied to another type or DECL later may be returned;
1717      otherwise the return value should be NULL_TREE.  This pointer may be
1718      NULL if no special handling is required beyond the checks implied
1719      by the rest of this structure.  */
1720   tree (*handler) (tree *node, tree name, tree args,
1721                    int flags, bool *no_add_attrs);
1722   /* Specifies if attribute affects type's identity.  */
1723   bool affects_type_identity;
1724 };
1725
1726 /* These functions allow a front-end to perform a manual layout of a
1727    RECORD_TYPE.  (For instance, if the placement of subsequent fields
1728    depends on the placement of fields so far.)  Begin by calling
1729    start_record_layout.  Then, call place_field for each of the
1730    fields.  Then, call finish_record_layout.  See layout_type for the
1731    default way in which these functions are used.  */
1732 typedef struct record_layout_info_s {
1733   /* The RECORD_TYPE that we are laying out.  */
1734   tree t;
1735   /* The offset into the record so far, in bytes, not including bits in
1736      BITPOS.  */
1737   tree offset;
1738   /* The last known alignment of SIZE.  */
1739   unsigned int offset_align;
1740   /* The bit position within the last OFFSET_ALIGN bits, in bits.  */
1741   tree bitpos;
1742   /* The alignment of the record so far, in bits.  */
1743   unsigned int record_align;
1744   /* The alignment of the record so far, ignoring #pragma pack and
1745      __attribute__ ((packed)), in bits.  */
1746   unsigned int unpacked_align;
1747   /* The previous field laid out.  */
1748   tree prev_field;
1749   /* The static variables (i.e., class variables, as opposed to
1750      instance variables) encountered in T.  */
1751   vec<tree, va_gc> *pending_statics;
1752   /* Bits remaining in the current alignment group */
1753   int remaining_in_alignment;
1754   /* True if we've seen a packed field that didn't have normal
1755      alignment anyway.  */
1756   int packed_maybe_necessary;
1757 } *record_layout_info;
1758
1759 /* Iterator for going through the function arguments.  */
1760 struct function_args_iterator {
1761   tree next;                    /* TREE_LIST pointing to the next argument */
1762 };
1763
1764 /* Structures to map from a tree to another tree.  */
1765 struct GTY(()) tree_map_base {
1766   tree from;
1767 };
1768
1769 /* Map from a tree to another tree.  */
1770
1771 struct GTY(()) tree_map {
1772   struct tree_map_base base;
1773   unsigned int hash;
1774   tree to;
1775 };
1776
1777 /* Map from a decl tree to another tree.  */
1778 struct GTY(()) tree_decl_map {
1779   struct tree_map_base base;
1780   tree to;
1781 };
1782
1783 /* Map from a tree to an int.  */
1784 struct GTY(()) tree_int_map {
1785   struct tree_map_base base;
1786   unsigned int to;
1787 };
1788
1789 /* Map from a decl tree to a tree vector.  */
1790 struct GTY(()) tree_vec_map {
1791   struct tree_map_base base;
1792   vec<tree, va_gc> *to;
1793 };
1794
1795 /* Abstract iterators for CALL_EXPRs.  These static inline definitions
1796    have to go towards the end of tree.h so that union tree_node is fully
1797    defined by this point.  */
1798
1799 /* Structure containing iterator state.  */
1800 struct call_expr_arg_iterator {
1801   tree t;       /* the call_expr */
1802   int n;        /* argument count */
1803   int i;        /* next argument index */
1804 };
1805
1806 struct const_call_expr_arg_iterator {
1807   const_tree t; /* the call_expr */
1808   int n;        /* argument count */
1809   int i;        /* next argument index */
1810 };
1811
1812 /* The builtin_info structure holds the FUNCTION_DECL of the standard builtin
1813    function, and a flag that says if the function is available implicitly, or
1814    whether the user has to code explicit calls to __builtin_<xxx>.  */
1815 struct GTY(()) builtin_info_type {
1816   tree decl[(int)END_BUILTINS];
1817   bool implicit_p[(int)END_BUILTINS];
1818 };
1819
1820
1821 /*---------------------------------------------------------------------------
1822                                 Global variables
1823 ---------------------------------------------------------------------------*/
1824 /* Matrix describing the structures contained in a given tree code.  */
1825 extern unsigned char tree_contains_struct[MAX_TREE_CODES][64];
1826
1827 /* Class of tree given its code.  */
1828 extern const enum tree_code_class tree_code_type[];
1829
1830 /* Each tree code class has an associated string representation.
1831    These must correspond to the tree_code_class entries.  */
1832 extern const char *const tree_code_class_strings[];
1833
1834 /* Number of argument-words in each kind of tree-node.  */
1835 extern const unsigned char tree_code_length[];
1836
1837 /* Vector of all alias pairs for global symbols.  */
1838 extern GTY(()) vec<alias_pair, va_gc> *alias_pairs;
1839
1840 /* Names of all the built_in classes.  */
1841 extern const char *const built_in_class_names[BUILT_IN_LAST];
1842
1843 /* Names of all the built_in functions.  */
1844 extern const char * built_in_names[(int) END_BUILTINS];
1845
1846 /* Number of operands and names for each OMP_CLAUSE node.  */
1847 extern unsigned const char omp_clause_num_ops[];
1848 extern const char * const omp_clause_code_name[];
1849
1850 /* A vector of all translation-units.  */
1851 extern GTY (()) vec<tree, va_gc> *all_translation_units;
1852
1853 /* Vector of standard trees used by the C compiler.  */
1854 extern GTY(()) tree global_trees[TI_MAX];
1855
1856 /* The standard C integer types.  Use integer_type_kind to index into
1857    this array.  */
1858 extern GTY(()) tree integer_types[itk_none];
1859
1860 /* Types used to represent sizes.  */
1861 extern GTY(()) tree sizetype_tab[(int) stk_type_kind_last];
1862
1863 /* Arrays for keeping track of tree node statistics.  */
1864 extern int tree_node_counts[];
1865 extern int tree_node_sizes[];
1866
1867 /* True if we are in gimple form and the actions of the folders need to
1868    be restricted.  False if we are not in gimple form and folding is not
1869    restricted to creating gimple expressions.  */
1870 extern bool in_gimple_form;
1871
1872 /* Functional interface to the builtin functions.  */
1873 extern GTY(()) builtin_info_type builtin_info;
1874
1875 /* If nonzero, an upper limit on alignment of structure fields, in bits,  */
1876 extern unsigned int maximum_field_alignment;
1877
1878 /* Nonzero means lvalues are limited to those valid in pedantic ANSI C.
1879    Zero means allow extended lvalues.  */
1880 extern int pedantic_lvalues;
1881
1882 /* Points to the FUNCTION_DECL of the function whose body we are reading.  */
1883 extern GTY(()) tree current_function_decl;
1884
1885 /* Nonzero means a FUNC_BEGIN label was emitted.  */
1886 extern GTY(()) const char * current_function_func_begin_label;
1887
1888 #endif  // GCC_TREE_CORE_H