gcc/tree-core.h

   1 /* Core data structures for the 'tree' type.
   2    Copyright (C) 1989-2015 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 "symtab.h"
  24
  25 /* This file contains all the data structures that define the 'tree' type.
  26    There are no accessor macros nor functions in this file. Only the
  27    basic data structures, extern declarations and type definitions.  */
  28
  29 /*---------------------------------------------------------------------------
  30    Forward type declarations.  Mostly to avoid including unnecessary headers
  31 ---------------------------------------------------------------------------*/
  32 struct function;
  33 struct real_value;
  34 struct fixed_value;
  35 struct ptr_info_def;
  36 struct range_info_def;
  37 struct die_struct;
  38
  39
  40 /*---------------------------------------------------------------------------
  41                               #defined constants
  42 ---------------------------------------------------------------------------*/
  43 /* Nonzero if this is a call to a function whose return value depends
  44    solely on its arguments, has no side effects, and does not read
  45    global memory.  This corresponds to TREE_READONLY for function
  46    decls.  */
  47 #define ECF_CONST                 (1 << 0)
  48
  49 /* Nonzero if this is a call to "pure" function (like const function,
  50    but may read memory.  This corresponds to DECL_PURE_P for function
  51    decls.  */
  52 #define ECF_PURE                  (1 << 1)
  53
  54 /* Nonzero if this is ECF_CONST or ECF_PURE but cannot be proven to no
  55    infinite loop.  This corresponds to DECL_LOOPING_CONST_OR_PURE_P
  56    for function decls.*/
  57 #define ECF_LOOPING_CONST_OR_PURE (1 << 2)
  58
  59 /* Nonzero if this call will never return.  */
  60 #define ECF_NORETURN              (1 << 3)
  61
  62 /* Nonzero if this is a call to malloc or a related function.  */
  63 #define ECF_MALLOC                (1 << 4)
  64
  65 /* Nonzero if it is plausible that this is a call to alloca.  */
  66 #define ECF_MAY_BE_ALLOCA         (1 << 5)
  67
  68 /* Nonzero if this is a call to a function that won't throw an exception.  */
  69 #define ECF_NOTHROW               (1 << 6)
  70
  71 /* Nonzero if this is a call to setjmp or a related function.  */
  72 #define ECF_RETURNS_TWICE         (1 << 7)
  73
  74 /* Nonzero if this call replaces the current stack frame.  */
  75 #define ECF_SIBCALL               (1 << 8)
  76
  77 /* Function does not read or write memory (but may have side effects, so
  78    it does not necessarily fit ECF_CONST).  */
  79 #define ECF_NOVOPS                (1 << 9)
  80
  81 /* The function does not lead to calls within current function unit.  */
  82 #define ECF_LEAF                  (1 << 10)
  83
  84 /* Nonzero if this call does not affect transactions.  */
  85 #define ECF_TM_PURE               (1 << 11)
  86
  87 /* Nonzero if this call is into the transaction runtime library.  */
  88 #define ECF_TM_BUILTIN            (1 << 12)
  89
  90 /* Call argument flags.  */
  91 /* Nonzero if the argument is not dereferenced recursively, thus only
  92    directly reachable memory is read or written.  */
  93 #define EAF_DIRECT              (1 << 0)
  94
  95 /* Nonzero if memory reached by the argument is not clobbered.  */
  96 #define EAF_NOCLOBBER           (1 << 1)
  97
  98 /* Nonzero if the argument does not escape.  */
  99 #define EAF_NOESCAPE            (1 << 2)
 100
 101 /* Nonzero if the argument is not used by the function.  */
 102 #define EAF_UNUSED              (1 << 3)
 103
 104 /* Call return flags.  */
 105 /* Mask for the argument number that is returned.  Lower two bits of
 106    the return flags, encodes argument slots zero to three.  */
 107 #define ERF_RETURN_ARG_MASK     (3)
 108
 109 /* Nonzero if the return value is equal to the argument number
 110    flags & ERF_RETURN_ARG_MASK.  */
 111 #define ERF_RETURNS_ARG         (1 << 2)
 112
 113 /* Nonzero if the return value does not alias with anything.  Functions
 114    with the malloc attribute have this set on their return value.  */
 115 #define ERF_NOALIAS             (1 << 3)
 116
 117
 118 /*---------------------------------------------------------------------------
 119                                   Enumerations
 120 ---------------------------------------------------------------------------*/
 121 /* Codes of tree nodes.  */
 122 #define DEFTREECODE(SYM, STRING, TYPE, NARGS)   SYM,
 123 #define END_OF_BASE_TREE_CODES LAST_AND_UNUSED_TREE_CODE,
 124
 125 enum tree_code {
 126 #include "all-tree.def"
 127 MAX_TREE_CODES
 128 };
 129
 130 #undef DEFTREECODE
 131 #undef END_OF_BASE_TREE_CODES
 132
 133 /* Number of language-independent tree codes.  */
 134 #define NUM_TREE_CODES \
 135   ((int) LAST_AND_UNUSED_TREE_CODE)
 136
 137 #define CODE_CONTAINS_STRUCT(CODE, STRUCT) \
 138   (tree_contains_struct[(CODE)][(STRUCT)])
 139
 140
 141 /* Classify which part of the compiler has defined a given builtin function.
 142    Note that we assume below that this is no more than two bits.  */
 143 enum built_in_class {
 144   NOT_BUILT_IN = 0,
 145   BUILT_IN_FRONTEND,
 146   BUILT_IN_MD,
 147   BUILT_IN_NORMAL
 148 };
 149
 150 /* Last marker used for LTO stremaing of built_in_class.  We can not add it
 151    to the enum since we need the enumb to fit in 2 bits.  */
 152 #define BUILT_IN_LAST (BUILT_IN_NORMAL + 1)
 153
 154 /* Codes that identify the various built in functions
 155    so that expand_call can identify them quickly.  */
 156 #define DEF_BUILTIN(ENUM, N, C, T, LT, B, F, NA, AT, IM, COND) ENUM,
 157 enum built_in_function {
 158 #include "builtins.def"
 159
 160   BEGIN_CHKP_BUILTINS,
 161
 162 #undef DEF_BUILTIN
 163 #define DEF_BUILTIN(ENUM, N, C, T, LT, B, F, NA, AT, IM, COND)
 164 #undef DEF_BUILTIN_CHKP
 165 #define DEF_BUILTIN_CHKP(ENUM, N, C, T, LT, B, F, NA, AT, IM, COND) \
 166   ENUM##_CHKP = ENUM + BEGIN_CHKP_BUILTINS + 1,
 167 #include "builtins.def"
 168 #undef DEF_BUILTIN_CHKP
 169
 170   END_CHKP_BUILTINS = BEGIN_CHKP_BUILTINS * 2 + 1,
 171
 172   /* Complex division routines in libgcc.  These are done via builtins
 173      because emit_library_call_value can't handle complex values.  */
 174   BUILT_IN_COMPLEX_MUL_MIN,
 175   BUILT_IN_COMPLEX_MUL_MAX
 176     = BUILT_IN_COMPLEX_MUL_MIN
 177       + MAX_MODE_COMPLEX_FLOAT
 178       - MIN_MODE_COMPLEX_FLOAT,
 179
 180   BUILT_IN_COMPLEX_DIV_MIN,
 181   BUILT_IN_COMPLEX_DIV_MAX
 182     = BUILT_IN_COMPLEX_DIV_MIN
 183       + MAX_MODE_COMPLEX_FLOAT
 184       - MIN_MODE_COMPLEX_FLOAT,
 185
 186   /* Upper bound on non-language-specific builtins.  */
 187   END_BUILTINS
 188 };
 189 #undef DEF_BUILTIN
 190
 191 /* Tree code classes.  Each tree_code has an associated code class
 192    represented by a TREE_CODE_CLASS.  */
 193 enum tree_code_class {
 194   tcc_exceptional, /* An exceptional code (fits no category).  */
 195   tcc_constant,    /* A constant.  */
 196   /* Order of tcc_type and tcc_declaration is important.  */
 197   tcc_type,        /* A type object code.  */
 198   tcc_declaration, /* A declaration (also serving as variable refs).  */
 199   tcc_reference,   /* A reference to storage.  */
 200   tcc_comparison,  /* A comparison expression.  */
 201   tcc_unary,       /* A unary arithmetic expression.  */
 202   tcc_binary,      /* A binary arithmetic expression.  */
 203   tcc_statement,   /* A statement expression, which have side effects
 204                       but usually no interesting value.  */
 205   tcc_vl_exp,      /* A function call or other expression with a
 206                       variable-length operand vector.  */
 207   tcc_expression   /* Any other expression.  */
 208 };
 209
 210 /* OMP_CLAUSE codes.  Do not reorder, as this is used to index into
 211    the tables omp_clause_num_ops and omp_clause_code_name.  */
 212 enum omp_clause_code {
 213   /* Clause zero is special-cased inside the parser
 214      (c_parser_omp_variable_list).  */
 215   OMP_CLAUSE_ERROR = 0,
 216
 217   /* OpenACC/OpenMP clause: private (variable_list).  */
 218   OMP_CLAUSE_PRIVATE,
 219
 220   /* OpenMP clause: shared (variable_list).  */
 221   OMP_CLAUSE_SHARED,
 222
 223   /* OpenACC/OpenMP clause: firstprivate (variable_list).  */
 224   OMP_CLAUSE_FIRSTPRIVATE,
 225
 226   /* OpenMP clause: lastprivate (variable_list).  */
 227   OMP_CLAUSE_LASTPRIVATE,
 228
 229   /* OpenACC/OpenMP clause: reduction (operator:variable_list).
 230      OMP_CLAUSE_REDUCTION_CODE: The tree_code of the operator.
 231      Operand 1: OMP_CLAUSE_REDUCTION_INIT: Stmt-list to initialize the var.
 232      Operand 2: OMP_CLAUSE_REDUCTION_MERGE: Stmt-list to merge private var
 233                 into the shared one.
 234      Operand 3: OMP_CLAUSE_REDUCTION_PLACEHOLDER: A dummy VAR_DECL
 235                 placeholder used in OMP_CLAUSE_REDUCTION_{INIT,MERGE}.
 236      Operand 4: OMP_CLAUSE_REDUCTION_DECL_PLACEHOLDER: Another dummy
 237                 VAR_DECL placeholder, used like the above for C/C++ array
 238                 reductions.  */
 239   OMP_CLAUSE_REDUCTION,
 240
 241   /* OpenMP clause: copyin (variable_list).  */
 242   OMP_CLAUSE_COPYIN,
 243
 244   /* OpenMP clause: copyprivate (variable_list).  */
 245   OMP_CLAUSE_COPYPRIVATE,
 246
 247   /* OpenMP clause: linear (variable-list[:linear-step]).  */
 248   OMP_CLAUSE_LINEAR,
 249
 250   /* OpenMP clause: aligned (variable-list[:alignment]).  */
 251   OMP_CLAUSE_ALIGNED,
 252
 253   /* OpenMP clause: depend ({in,out,inout}:variable-list).  */
 254   OMP_CLAUSE_DEPEND,
 255
 256   /* OpenMP clause: uniform (argument-list).  */
 257   OMP_CLAUSE_UNIFORM,
 258
 259   /* OpenMP clause: to (extended-list).
 260      Only when it appears in declare target.  */
 261   OMP_CLAUSE_TO_DECLARE,
 262
 263   /* OpenMP clause: link (variable-list).  */
 264   OMP_CLAUSE_LINK,
 265
 266   /* OpenMP clause: from (variable-list).  */
 267   OMP_CLAUSE_FROM,
 268
 269   /* OpenMP clause: to (variable-list).  */
 270   OMP_CLAUSE_TO,
 271
 272   /* OpenACC clauses: {copy, copyin, copyout, create, delete, deviceptr,
 273      device, host (self), present, present_or_copy (pcopy), present_or_copyin
 274      (pcopyin), present_or_copyout (pcopyout), present_or_create (pcreate)}
 275      (variable-list).
 276
 277      OpenMP clause: map ({alloc:,to:,from:,tofrom:,}variable-list).  */
 278   OMP_CLAUSE_MAP,
 279
 280   /* OpenMP clause: use_device_ptr (variable-list).  */
 281   OMP_CLAUSE_USE_DEVICE_PTR,
 282
 283   /* OpenMP clause: is_device_ptr (variable-list).  */
 284   OMP_CLAUSE_IS_DEVICE_PTR,
 285
 286   /* Internal structure to hold OpenACC cache directive's variable-list.
 287      #pragma acc cache (variable-list).  */
 288   OMP_CLAUSE__CACHE_,
 289
 290   /* OpenACC clause: device_resident (variable_list).  */
 291   OMP_CLAUSE_DEVICE_RESIDENT,
 292
 293   /* OpenACC clause: use_device (variable_list).  */
 294   OMP_CLAUSE_USE_DEVICE,
 295
 296   /* OpenACC clause: gang [(gang-argument-list)].
 297      Where
 298       gang-argument-list: [gang-argument-list, ] gang-argument
 299       gang-argument: [num:] integer-expression
 300                    | static: size-expression
 301       size-expression: * | integer-expression.  */
 302   OMP_CLAUSE_GANG,
 303
 304   /* OpenACC clause: async [(integer-expression)].  */
 305   OMP_CLAUSE_ASYNC,
 306
 307   /* OpenACC clause: wait [(integer-expression-list)].  */
 308   OMP_CLAUSE_WAIT,
 309
 310   /* OpenACC clause: auto.  */
 311   OMP_CLAUSE_AUTO,
 312
 313   /* OpenACC clause: seq.  */
 314   OMP_CLAUSE_SEQ,
 315
 316   /* Internal clause: temporary for combined loops expansion.  */
 317   OMP_CLAUSE__LOOPTEMP_,
 318
 319   /* OpenACC/OpenMP clause: if (scalar-expression).  */
 320   OMP_CLAUSE_IF,
 321
 322   /* OpenMP clause: num_threads (integer-expression).  */
 323   OMP_CLAUSE_NUM_THREADS,
 324
 325   /* OpenMP clause: schedule.  */
 326   OMP_CLAUSE_SCHEDULE,
 327
 328   /* OpenMP clause: nowait.  */
 329   OMP_CLAUSE_NOWAIT,
 330
 331   /* OpenMP clause: ordered [(constant-integer-expression)].  */
 332   OMP_CLAUSE_ORDERED,
 333
 334   /* OpenMP clause: default.  */
 335   OMP_CLAUSE_DEFAULT,
 336
 337   /* OpenACC/OpenMP clause: collapse (constant-integer-expression).  */
 338   OMP_CLAUSE_COLLAPSE,
 339
 340   /* OpenMP clause: untied.  */
 341   OMP_CLAUSE_UNTIED,
 342
 343   /* OpenMP clause: final (scalar-expression).  */
 344   OMP_CLAUSE_FINAL,
 345
 346   /* OpenMP clause: mergeable.  */
 347   OMP_CLAUSE_MERGEABLE,
 348
 349   /* OpenMP clause: device (integer-expression).  */
 350   OMP_CLAUSE_DEVICE,
 351
 352   /* OpenMP clause: dist_schedule (static[:chunk-size]).  */
 353   OMP_CLAUSE_DIST_SCHEDULE,
 354
 355   /* OpenMP clause: inbranch.  */
 356   OMP_CLAUSE_INBRANCH,
 357
 358   /* OpenMP clause: notinbranch.  */
 359   OMP_CLAUSE_NOTINBRANCH,
 360
 361   /* OpenMP clause: num_teams(integer-expression).  */
 362   OMP_CLAUSE_NUM_TEAMS,
 363
 364   /* OpenMP clause: thread_limit(integer-expression).  */
 365   OMP_CLAUSE_THREAD_LIMIT,
 366
 367   /* OpenMP clause: proc_bind ({master,close,spread}).  */
 368   OMP_CLAUSE_PROC_BIND,
 369
 370   /* OpenMP clause: safelen (constant-integer-expression).  */
 371   OMP_CLAUSE_SAFELEN,
 372
 373   /* OpenMP clause: simdlen (constant-integer-expression).  */
 374   OMP_CLAUSE_SIMDLEN,
 375
 376   /* OpenMP clause: for.  */
 377   OMP_CLAUSE_FOR,
 378
 379   /* OpenMP clause: parallel.  */
 380   OMP_CLAUSE_PARALLEL,
 381
 382   /* OpenMP clause: sections.  */
 383   OMP_CLAUSE_SECTIONS,
 384
 385   /* OpenMP clause: taskgroup.  */
 386   OMP_CLAUSE_TASKGROUP,
 387
 388   /* OpenMP clause: priority (integer-expression).  */
 389   OMP_CLAUSE_PRIORITY,
 390
 391   /* OpenMP clause: grainsize (integer-expression).  */
 392   OMP_CLAUSE_GRAINSIZE,
 393
 394   /* OpenMP clause: num_tasks (integer-expression).  */
 395   OMP_CLAUSE_NUM_TASKS,
 396
 397   /* OpenMP clause: nogroup.  */
 398   OMP_CLAUSE_NOGROUP,
 399
 400   /* OpenMP clause: threads.  */
 401   OMP_CLAUSE_THREADS,
 402
 403   /* OpenMP clause: simd.  */
 404   OMP_CLAUSE_SIMD,
 405
 406   /* OpenMP clause: hint (integer-expression).  */
 407   OMP_CLAUSE_HINT,
 408
 409   /* OpenMP clause: defaultmap (tofrom: scalar).  */
 410   OMP_CLAUSE_DEFAULTMAP,
 411
 412   /* Internally used only clause, holding SIMD uid.  */
 413   OMP_CLAUSE__SIMDUID_,
 414
 415   /* Internally used only clause, holding _Cilk_for # of iterations
 416      on OMP_PARALLEL.  */
 417   OMP_CLAUSE__CILK_FOR_COUNT_,
 418
 419   /* OpenACC clause: independent.  */
 420   OMP_CLAUSE_INDEPENDENT,
 421
 422   /* OpenACC clause: worker [( [num:] integer-expression)].  */
 423   OMP_CLAUSE_WORKER,
 424
 425   /* OpenACC clause: vector [( [length:] integer-expression)].  */
 426   OMP_CLAUSE_VECTOR,
 427
 428   /* OpenACC clause: num_gangs (integer-expression).  */
 429   OMP_CLAUSE_NUM_GANGS,
 430
 431   /* OpenACC clause: num_workers (integer-expression).  */
 432   OMP_CLAUSE_NUM_WORKERS,
 433
 434   /* OpenACC clause: vector_length (integer-expression).  */
 435   OMP_CLAUSE_VECTOR_LENGTH,
 436
 437   /* OpenACC clause: tile ( size-expr-list ).  */
 438   OMP_CLAUSE_TILE
 439 };
 440
 441 #undef DEFTREESTRUCT
 442 #define DEFTREESTRUCT(ENUM, NAME) ENUM,
 443 enum tree_node_structure_enum {
 444 #include "treestruct.def"
 445   LAST_TS_ENUM
 446 };
 447 #undef DEFTREESTRUCT
 448
 449 enum omp_clause_schedule_kind {
 450   OMP_CLAUSE_SCHEDULE_STATIC,
 451   OMP_CLAUSE_SCHEDULE_DYNAMIC,
 452   OMP_CLAUSE_SCHEDULE_GUIDED,
 453   OMP_CLAUSE_SCHEDULE_AUTO,
 454   OMP_CLAUSE_SCHEDULE_RUNTIME,
 455   OMP_CLAUSE_SCHEDULE_CILKFOR,
 456   OMP_CLAUSE_SCHEDULE_MASK = (1 << 3) - 1,
 457   OMP_CLAUSE_SCHEDULE_MONOTONIC = (1 << 3),
 458   OMP_CLAUSE_SCHEDULE_NONMONOTONIC = (1 << 4),
 459   OMP_CLAUSE_SCHEDULE_LAST = 2 * OMP_CLAUSE_SCHEDULE_NONMONOTONIC - 1
 460 };
 461
 462 enum omp_clause_default_kind {
 463   OMP_CLAUSE_DEFAULT_UNSPECIFIED,
 464   OMP_CLAUSE_DEFAULT_SHARED,
 465   OMP_CLAUSE_DEFAULT_NONE,
 466   OMP_CLAUSE_DEFAULT_PRIVATE,
 467   OMP_CLAUSE_DEFAULT_FIRSTPRIVATE,
 468   OMP_CLAUSE_DEFAULT_LAST
 469 };
 470
 471 /* There is a TYPE_QUAL value for each type qualifier.  They can be
 472    combined by bitwise-or to form the complete set of qualifiers for a
 473    type.  */
 474 enum cv_qualifier {
 475   TYPE_UNQUALIFIED   = 0x0,
 476   TYPE_QUAL_CONST    = 0x1,
 477   TYPE_QUAL_VOLATILE = 0x2,
 478   TYPE_QUAL_RESTRICT = 0x4,
 479   TYPE_QUAL_ATOMIC   = 0x8
 480 };
 481
 482 /* Standard named or nameless data types of the C compiler.  */
 483 enum tree_index {
 484   TI_ERROR_MARK,
 485   TI_INTQI_TYPE,
 486   TI_INTHI_TYPE,
 487   TI_INTSI_TYPE,
 488   TI_INTDI_TYPE,
 489   TI_INTTI_TYPE,
 490
 491   TI_UINTQI_TYPE,
 492   TI_UINTHI_TYPE,
 493   TI_UINTSI_TYPE,
 494   TI_UINTDI_TYPE,
 495   TI_UINTTI_TYPE,
 496
 497   TI_ATOMICQI_TYPE,
 498   TI_ATOMICHI_TYPE,
 499   TI_ATOMICSI_TYPE,
 500   TI_ATOMICDI_TYPE,
 501   TI_ATOMICTI_TYPE,
 502
 503   TI_UINT16_TYPE,
 504   TI_UINT32_TYPE,
 505   TI_UINT64_TYPE,
 506
 507   TI_VOID,
 508
 509   TI_INTEGER_ZERO,
 510   TI_INTEGER_ONE,
 511   TI_INTEGER_THREE,
 512   TI_INTEGER_MINUS_ONE,
 513   TI_NULL_POINTER,
 514
 515   TI_SIZE_ZERO,
 516   TI_SIZE_ONE,
 517
 518   TI_BITSIZE_ZERO,
 519   TI_BITSIZE_ONE,
 520   TI_BITSIZE_UNIT,
 521
 522   TI_PUBLIC,
 523   TI_PROTECTED,
 524   TI_PRIVATE,
 525
 526   TI_BOOLEAN_FALSE,
 527   TI_BOOLEAN_TRUE,
 528
 529   TI_COMPLEX_INTEGER_TYPE,
 530   TI_COMPLEX_FLOAT_TYPE,
 531   TI_COMPLEX_DOUBLE_TYPE,
 532   TI_COMPLEX_LONG_DOUBLE_TYPE,
 533
 534   TI_FLOAT_TYPE,
 535   TI_DOUBLE_TYPE,
 536   TI_LONG_DOUBLE_TYPE,
 537
 538   TI_FLOAT_PTR_TYPE,
 539   TI_DOUBLE_PTR_TYPE,
 540   TI_LONG_DOUBLE_PTR_TYPE,
 541   TI_INTEGER_PTR_TYPE,
 542
 543   TI_VOID_TYPE,
 544   TI_PTR_TYPE,
 545   TI_CONST_PTR_TYPE,
 546   TI_SIZE_TYPE,
 547   TI_PID_TYPE,
 548   TI_PTRDIFF_TYPE,
 549   TI_VA_LIST_TYPE,
 550   TI_VA_LIST_GPR_COUNTER_FIELD,
 551   TI_VA_LIST_FPR_COUNTER_FIELD,
 552   TI_BOOLEAN_TYPE,
 553   TI_FILEPTR_TYPE,
 554   TI_POINTER_SIZED_TYPE,
 555
 556   TI_POINTER_BOUNDS_TYPE,
 557
 558   TI_DFLOAT32_TYPE,
 559   TI_DFLOAT64_TYPE,
 560   TI_DFLOAT128_TYPE,
 561   TI_DFLOAT32_PTR_TYPE,
 562   TI_DFLOAT64_PTR_TYPE,
 563   TI_DFLOAT128_PTR_TYPE,
 564
 565   TI_VOID_LIST_NODE,
 566
 567   TI_MAIN_IDENTIFIER,
 568
 569   TI_SAT_SFRACT_TYPE,
 570   TI_SAT_FRACT_TYPE,
 571   TI_SAT_LFRACT_TYPE,
 572   TI_SAT_LLFRACT_TYPE,
 573   TI_SAT_USFRACT_TYPE,
 574   TI_SAT_UFRACT_TYPE,
 575   TI_SAT_ULFRACT_TYPE,
 576   TI_SAT_ULLFRACT_TYPE,
 577   TI_SFRACT_TYPE,
 578   TI_FRACT_TYPE,
 579   TI_LFRACT_TYPE,
 580   TI_LLFRACT_TYPE,
 581   TI_USFRACT_TYPE,
 582   TI_UFRACT_TYPE,
 583   TI_ULFRACT_TYPE,
 584   TI_ULLFRACT_TYPE,
 585   TI_SAT_SACCUM_TYPE,
 586   TI_SAT_ACCUM_TYPE,
 587   TI_SAT_LACCUM_TYPE,
 588   TI_SAT_LLACCUM_TYPE,
 589   TI_SAT_USACCUM_TYPE,
 590   TI_SAT_UACCUM_TYPE,
 591   TI_SAT_ULACCUM_TYPE,
 592   TI_SAT_ULLACCUM_TYPE,
 593   TI_SACCUM_TYPE,
 594   TI_ACCUM_TYPE,
 595   TI_LACCUM_TYPE,
 596   TI_LLACCUM_TYPE,
 597   TI_USACCUM_TYPE,
 598   TI_UACCUM_TYPE,
 599   TI_ULACCUM_TYPE,
 600   TI_ULLACCUM_TYPE,
 601   TI_QQ_TYPE,
 602   TI_HQ_TYPE,
 603   TI_SQ_TYPE,
 604   TI_DQ_TYPE,
 605   TI_TQ_TYPE,
 606   TI_UQQ_TYPE,
 607   TI_UHQ_TYPE,
 608   TI_USQ_TYPE,
 609   TI_UDQ_TYPE,
 610   TI_UTQ_TYPE,
 611   TI_SAT_QQ_TYPE,
 612   TI_SAT_HQ_TYPE,
 613   TI_SAT_SQ_TYPE,
 614   TI_SAT_DQ_TYPE,
 615   TI_SAT_TQ_TYPE,
 616   TI_SAT_UQQ_TYPE,
 617   TI_SAT_UHQ_TYPE,
 618   TI_SAT_USQ_TYPE,
 619   TI_SAT_UDQ_TYPE,
 620   TI_SAT_UTQ_TYPE,
 621   TI_HA_TYPE,
 622   TI_SA_TYPE,
 623   TI_DA_TYPE,
 624   TI_TA_TYPE,
 625   TI_UHA_TYPE,
 626   TI_USA_TYPE,
 627   TI_UDA_TYPE,
 628   TI_UTA_TYPE,
 629   TI_SAT_HA_TYPE,
 630   TI_SAT_SA_TYPE,
 631   TI_SAT_DA_TYPE,
 632   TI_SAT_TA_TYPE,
 633   TI_SAT_UHA_TYPE,
 634   TI_SAT_USA_TYPE,
 635   TI_SAT_UDA_TYPE,
 636   TI_SAT_UTA_TYPE,
 637
 638   TI_OPTIMIZATION_DEFAULT,
 639   TI_OPTIMIZATION_CURRENT,
 640   TI_TARGET_OPTION_DEFAULT,
 641   TI_TARGET_OPTION_CURRENT,
 642   TI_CURRENT_TARGET_PRAGMA,
 643   TI_CURRENT_OPTIMIZE_PRAGMA,
 644
 645   TI_MAX
 646 };
 647
 648 /* An enumeration of the standard C integer types.  These must be
 649    ordered so that shorter types appear before longer ones, and so
 650    that signed types appear before unsigned ones, for the correct
 651    functioning of interpret_integer() in c-lex.c.  */
 652 enum integer_type_kind {
 653   itk_char,
 654   itk_signed_char,
 655   itk_unsigned_char,
 656   itk_short,
 657   itk_unsigned_short,
 658   itk_int,
 659   itk_unsigned_int,
 660   itk_long,
 661   itk_unsigned_long,
 662   itk_long_long,
 663   itk_unsigned_long_long,
 664
 665   itk_intN_0,
 666   itk_unsigned_intN_0,
 667   itk_intN_1,
 668   itk_unsigned_intN_1,
 669   itk_intN_2,
 670   itk_unsigned_intN_2,
 671   itk_intN_3,
 672   itk_unsigned_intN_3,
 673
 674   itk_none
 675 };
 676
 677 /* A pointer-to-function member type looks like:
 678
 679      struct {
 680        __P __pfn;
 681        ptrdiff_t __delta;
 682      };
 683
 684    If __pfn is NULL, it is a NULL pointer-to-member-function.
 685
 686    (Because the vtable is always the first thing in the object, we
 687    don't need its offset.)  If the function is virtual, then PFN is
 688    one plus twice the index into the vtable; otherwise, it is just a
 689    pointer to the function.
 690
 691    Unfortunately, using the lowest bit of PFN doesn't work in
 692    architectures that don't impose alignment requirements on function
 693    addresses, or that use the lowest bit to tell one ISA from another,
 694    for example.  For such architectures, we use the lowest bit of
 695    DELTA instead of the lowest bit of the PFN, and DELTA will be
 696    multiplied by 2.  */
 697 enum ptrmemfunc_vbit_where_t {
 698   ptrmemfunc_vbit_in_pfn,
 699   ptrmemfunc_vbit_in_delta
 700 };
 701
 702 /* Flags that may be passed in the third argument of decl_attributes, and
 703    to handler functions for attributes.  */
 704 enum attribute_flags {
 705   /* The type passed in is the type of a DECL, and any attributes that
 706      should be passed in again to be applied to the DECL rather than the
 707      type should be returned.  */
 708   ATTR_FLAG_DECL_NEXT = 1,
 709   /* The type passed in is a function return type, and any attributes that
 710      should be passed in again to be applied to the function type rather
 711      than the return type should be returned.  */
 712   ATTR_FLAG_FUNCTION_NEXT = 2,
 713   /* The type passed in is an array element type, and any attributes that
 714      should be passed in again to be applied to the array type rather
 715      than the element type should be returned.  */
 716   ATTR_FLAG_ARRAY_NEXT = 4,
 717   /* The type passed in is a structure, union or enumeration type being
 718      created, and should be modified in place.  */
 719   ATTR_FLAG_TYPE_IN_PLACE = 8,
 720   /* The attributes are being applied by default to a library function whose
 721      name indicates known behavior, and should be silently ignored if they
 722      are not in fact compatible with the function type.  */
 723   ATTR_FLAG_BUILT_IN = 16,
 724   /* A given attribute has been parsed as a C++-11 attribute.  */
 725   ATTR_FLAG_CXX11 = 32
 726 };
 727
 728 /* Types used to represent sizes.  */
 729 enum size_type_kind {
 730   stk_sizetype,         /* Normal representation of sizes in bytes.  */
 731   stk_ssizetype,        /* Signed representation of sizes in bytes.  */
 732   stk_bitsizetype,      /* Normal representation of sizes in bits.  */
 733   stk_sbitsizetype,     /* Signed representation of sizes in bits.  */
 734   stk_type_kind_last
 735 };
 736
 737 enum operand_equal_flag {
 738   OEP_ONLY_CONST = 1,
 739   OEP_PURE_SAME = 2,
 740   OEP_CONSTANT_ADDRESS_OF = 4,
 741   OEP_ADDRESS_OF = 8
 742 };
 743
 744 /* Enum and arrays used for tree allocation stats.
 745    Keep in sync with tree.c:tree_node_kind_names.  */
 746 enum tree_node_kind {
 747   d_kind,
 748   t_kind,
 749   b_kind,
 750   s_kind,
 751   r_kind,
 752   e_kind,
 753   c_kind,
 754   id_kind,
 755   vec_kind,
 756   binfo_kind,
 757   ssa_name_kind,
 758   constr_kind,
 759   x_kind,
 760   lang_decl,
 761   lang_type,
 762   omp_clause_kind,
 763   all_kinds
 764 };
 765
 766 enum annot_expr_kind {
 767   annot_expr_ivdep_kind,
 768   annot_expr_no_vector_kind,
 769   annot_expr_vector_kind,
 770   annot_expr_kind_last
 771 };
 772
 773 /* Internal functions.  */
 774 enum internal_fn {
 775 #define DEF_INTERNAL_FN(CODE, FLAGS, FNSPEC) IFN_##CODE,
 776 #include "internal-fn.def"
 777 #undef DEF_INTERNAL_FN
 778   IFN_LAST
 779 };
 780
 781 /*---------------------------------------------------------------------------
 782                                 Type definitions
 783 ---------------------------------------------------------------------------*/
 784 /* When processing aliases at the symbol table level, we need the
 785    declaration of target. For this reason we need to queue aliases and
 786    process them after all declarations has been produced.  */
 787 struct GTY(()) alias_pair {
 788   tree decl;
 789   tree target;
 790 };
 791
 792 /* An initialization priority.  */
 793 typedef unsigned short priority_type;
 794
 795 /* The type of a callback function for walking over tree structure.  */
 796 typedef tree (*walk_tree_fn) (tree *, int *, void *);
 797
 798 /* The type of a callback function that represents a custom walk_tree.  */
 799 typedef tree (*walk_tree_lh) (tree *, int *, tree (*) (tree *, int *, void *),
 800                               void *, hash_set<tree> *);
 801
 802
 803 /*---------------------------------------------------------------------------
 804                               Main data structures
 805 ---------------------------------------------------------------------------*/
 806 /* A tree node can represent a data type, a variable, an expression
 807    or a statement.  Each node has a TREE_CODE which says what kind of
 808    thing it represents.  Some common codes are:
 809    INTEGER_TYPE -- represents a type of integers.
 810    ARRAY_TYPE -- represents a type of pointer.
 811    VAR_DECL -- represents a declared variable.
 812    INTEGER_CST -- represents a constant integer value.
 813    PLUS_EXPR -- represents a sum (an expression).
 814
 815    As for the contents of a tree node: there are some fields
 816    that all nodes share.  Each TREE_CODE has various special-purpose
 817    fields as well.  The fields of a node are never accessed directly,
 818    always through accessor macros.  */
 819
 820 /* Every kind of tree node starts with this structure,
 821    so all nodes have these fields.
 822
 823    See the accessor macros, defined below, for documentation of the
 824    fields, and the table below which connects the fields and the
 825    accessor macros.  */
 826
 827 struct GTY(()) tree_base {
 828   ENUM_BITFIELD(tree_code) code : 16;
 829
 830   unsigned side_effects_flag : 1;
 831   unsigned constant_flag : 1;
 832   unsigned addressable_flag : 1;
 833   unsigned volatile_flag : 1;
 834   unsigned readonly_flag : 1;
 835   unsigned asm_written_flag: 1;
 836   unsigned nowarning_flag : 1;
 837   unsigned visited : 1;
 838
 839   unsigned used_flag : 1;
 840   unsigned nothrow_flag : 1;
 841   unsigned static_flag : 1;
 842   unsigned public_flag : 1;
 843   unsigned private_flag : 1;
 844   unsigned protected_flag : 1;
 845   unsigned deprecated_flag : 1;
 846   unsigned default_def_flag : 1;
 847
 848   union {
 849     /* The bits in the following structure should only be used with
 850        accessor macros that constrain inputs with tree checking.  */
 851     struct {
 852       unsigned lang_flag_0 : 1;
 853       unsigned lang_flag_1 : 1;
 854       unsigned lang_flag_2 : 1;
 855       unsigned lang_flag_3 : 1;
 856       unsigned lang_flag_4 : 1;
 857       unsigned lang_flag_5 : 1;
 858       unsigned lang_flag_6 : 1;
 859       unsigned saturating_flag : 1;
 860
 861       unsigned unsigned_flag : 1;
 862       unsigned packed_flag : 1;
 863       unsigned user_align : 1;
 864       unsigned nameless_flag : 1;
 865       unsigned atomic_flag : 1;
 866       unsigned spare0 : 3;
 867
 868       unsigned spare1 : 8;
 869
 870       /* This field is only used with TREE_TYPE nodes; the only reason it is
 871          present in tree_base instead of tree_type is to save space.  The size
 872          of the field must be large enough to hold addr_space_t values.  */
 873       unsigned address_space : 8;
 874     } bits;
 875
 876     /* The following fields are present in tree_base to save space.  The
 877        nodes using them do not require any of the flags above and so can
 878        make better use of the 4-byte sized word.  */
 879
 880     /* The number of HOST_WIDE_INTs in an INTEGER_CST.  */
 881     struct {
 882       /* The number of HOST_WIDE_INTs if the INTEGER_CST is accessed in
 883          its native precision.  */
 884       unsigned char unextended;
 885
 886       /* The number of HOST_WIDE_INTs if the INTEGER_CST is extended to
 887          wider precisions based on its TYPE_SIGN.  */
 888       unsigned char extended;
 889
 890       /* The number of HOST_WIDE_INTs if the INTEGER_CST is accessed in
 891          offset_int precision, with smaller integers being extended
 892          according to their TYPE_SIGN.  This is equal to one of the two
 893          fields above but is cached for speed.  */
 894       unsigned char offset;
 895     } int_length;
 896
 897     /* VEC length.  This field is only used with TREE_VEC.  */
 898     int length;
 899
 900     /* SSA version number.  This field is only used with SSA_NAME.  */
 901     unsigned int version;
 902
 903     /* Internal function code.  */
 904     enum internal_fn ifn;
 905
 906     /* The following two fields are used for MEM_REF and TARGET_MEM_REF
 907        expression trees and specify known data non-dependences.  For
 908        two memory references in a function they are known to not
 909        alias if dependence_info.clique are equal and dependence_info.base
 910        are distinct.  */
 911     struct {
 912       unsigned short clique;
 913       unsigned short base;
 914     } dependence_info;
 915   } GTY((skip(""))) u;
 916 };
 917
 918 /* The following table lists the uses of each of the above flags and
 919    for which types of nodes they are defined.
 920
 921    addressable_flag:
 922
 923        TREE_ADDRESSABLE in
 924            VAR_DECL, PARM_DECL, RESULT_DECL, FUNCTION_DECL, LABEL_DECL
 925            SSA_NAME
 926            all types
 927            CONSTRUCTOR, IDENTIFIER_NODE
 928            STMT_EXPR
 929
 930        CALL_EXPR_TAILCALL in
 931            CALL_EXPR
 932
 933        CASE_LOW_SEEN in
 934            CASE_LABEL_EXPR
 935
 936        PREDICT_EXPR_OUTCOME in
 937            PREDICT_EXPR
 938
 939    static_flag:
 940
 941        TREE_STATIC in
 942            VAR_DECL, FUNCTION_DECL
 943            CONSTRUCTOR
 944
 945        TREE_NO_TRAMPOLINE in
 946            ADDR_EXPR
 947
 948        BINFO_VIRTUAL_P in
 949            TREE_BINFO
 950
 951        TREE_SYMBOL_REFERENCED in
 952            IDENTIFIER_NODE
 953
 954        CLEANUP_EH_ONLY in
 955            TARGET_EXPR, WITH_CLEANUP_EXPR
 956
 957        TRY_CATCH_IS_CLEANUP in
 958            TRY_CATCH_EXPR
 959
 960        ASM_INPUT_P in
 961            ASM_EXPR
 962
 963        TYPE_REF_CAN_ALIAS_ALL in
 964            POINTER_TYPE, REFERENCE_TYPE
 965
 966        CASE_HIGH_SEEN in
 967            CASE_LABEL_EXPR
 968
 969        ENUM_IS_SCOPED in
 970            ENUMERAL_TYPE
 971
 972        TRANSACTION_EXPR_OUTER in
 973            TRANSACTION_EXPR
 974
 975        SSA_NAME_ANTI_RANGE_P in
 976            SSA_NAME
 977
 978    public_flag:
 979
 980        TREE_OVERFLOW in
 981            INTEGER_CST, REAL_CST, COMPLEX_CST, VECTOR_CST
 982
 983        TREE_PUBLIC in
 984            VAR_DECL, FUNCTION_DECL
 985            IDENTIFIER_NODE
 986
 987        CONSTRUCTOR_NO_CLEARING in
 988            CONSTRUCTOR
 989
 990        ASM_VOLATILE_P in
 991            ASM_EXPR
 992
 993        CALL_EXPR_VA_ARG_PACK in
 994            CALL_EXPR
 995
 996        TYPE_CACHED_VALUES_P in
 997            all types
 998
 999        SAVE_EXPR_RESOLVED_P in
1000            SAVE_EXPR
1001
1002        OMP_CLAUSE_LASTPRIVATE_FIRSTPRIVATE in
1003            OMP_CLAUSE_LASTPRIVATE
1004
1005        OMP_CLAUSE_PRIVATE_DEBUG in
1006            OMP_CLAUSE_PRIVATE
1007
1008        OMP_CLAUSE_LINEAR_NO_COPYIN in
1009            OMP_CLAUSE_LINEAR
1010
1011        OMP_CLAUSE_MAP_ZERO_BIAS_ARRAY_SECTION in
1012            OMP_CLAUSE_MAP
1013
1014        OMP_CLAUSE_REDUCTION_OMP_ORIG_REF in
1015            OMP_CLAUSE_REDUCTION
1016
1017        TRANSACTION_EXPR_RELAXED in
1018            TRANSACTION_EXPR
1019
1020    private_flag:
1021
1022        TREE_PRIVATE in
1023            all decls
1024
1025        CALL_EXPR_RETURN_SLOT_OPT in
1026            CALL_EXPR
1027
1028        OMP_SECTION_LAST in
1029            OMP_SECTION
1030
1031        OMP_PARALLEL_COMBINED in
1032            OMP_PARALLEL
1033
1034        OMP_ATOMIC_SEQ_CST in
1035            OMP_ATOMIC*
1036
1037        OMP_CLAUSE_PRIVATE_OUTER_REF in
1038            OMP_CLAUSE_PRIVATE
1039
1040        OMP_CLAUSE_LINEAR_NO_COPYOUT in
1041            OMP_CLAUSE_LINEAR
1042
1043        TYPE_REF_IS_RVALUE in
1044            REFERENCE_TYPE
1045
1046        ENUM_IS_OPAQUE in
1047            ENUMERAL_TYPE
1048
1049    protected_flag:
1050
1051        TREE_PROTECTED in
1052            BLOCK
1053            all decls
1054
1055        CALL_FROM_THUNK_P and
1056        CALL_ALLOCA_FOR_VAR_P in
1057            CALL_EXPR
1058
1059        OMP_CLAUSE_LINEAR_VARIABLE_STRIDE in
1060            OMP_CLAUSE_LINEAR
1061
1062    side_effects_flag:
1063
1064        TREE_SIDE_EFFECTS in
1065            all expressions
1066            all decls
1067            all constants
1068
1069        FORCED_LABEL in
1070            LABEL_DECL
1071
1072    volatile_flag:
1073
1074        TREE_THIS_VOLATILE in
1075            all expressions
1076            all decls
1077
1078        TYPE_VOLATILE in
1079            all types
1080
1081    readonly_flag:
1082
1083        TREE_READONLY in
1084            all expressions
1085            all decls
1086
1087        TYPE_READONLY in
1088            all types
1089
1090    constant_flag:
1091
1092        TREE_CONSTANT in
1093            all expressions
1094            all decls
1095            all constants
1096
1097        TYPE_SIZES_GIMPLIFIED in
1098            all types
1099
1100    unsigned_flag:
1101
1102        TYPE_UNSIGNED in
1103            all types
1104
1105        DECL_UNSIGNED in
1106            all decls
1107
1108    asm_written_flag:
1109
1110        TREE_ASM_WRITTEN in
1111            VAR_DECL, FUNCTION_DECL, TYPE_DECL
1112            RECORD_TYPE, UNION_TYPE, QUAL_UNION_TYPE
1113            BLOCK, STRING_CST
1114
1115        SSA_NAME_OCCURS_IN_ABNORMAL_PHI in
1116            SSA_NAME
1117
1118    used_flag:
1119
1120        TREE_USED in
1121            all expressions
1122            all decls
1123            IDENTIFIER_NODE
1124
1125    nothrow_flag:
1126
1127        TREE_NOTHROW in
1128            CALL_EXPR
1129            FUNCTION_DECL
1130
1131        TYPE_ALIGN_OK in
1132            all types
1133
1134        TREE_THIS_NOTRAP in
1135           INDIRECT_REF, MEM_REF, TARGET_MEM_REF, ARRAY_REF, ARRAY_RANGE_REF
1136
1137        SSA_NAME_IN_FREE_LIST in
1138           SSA_NAME
1139
1140        DECL_NONALIASED in
1141           VAR_DECL
1142
1143    deprecated_flag:
1144
1145        TREE_DEPRECATED in
1146            all decls
1147            all types
1148
1149        IDENTIFIER_TRANSPARENT_ALIAS in
1150            IDENTIFIER_NODE
1151
1152    visited:
1153
1154        TREE_VISITED in
1155            all trees (used liberally by many passes)
1156
1157    saturating_flag:
1158
1159        TYPE_SATURATING in
1160            all types
1161
1162        VAR_DECL_IS_VIRTUAL_OPERAND in
1163            VAR_DECL
1164
1165    nowarning_flag:
1166
1167        TREE_NO_WARNING in
1168            all expressions
1169            all decls
1170
1171        TYPE_ARTIFICIAL in
1172            all types
1173
1174    default_def_flag:
1175
1176        TYPE_VECTOR_OPAQUE in
1177            VECTOR_TYPE
1178
1179        SSA_NAME_IS_DEFAULT_DEF in
1180            SSA_NAME
1181
1182        DECL_NONLOCAL_FRAME in
1183            VAR_DECL
1184
1185        TYPE_FINAL_P in
1186            RECORD_TYPE, UNION_TYPE and QUAL_UNION_TYPE
1187 */
1188
1189 struct GTY(()) tree_typed {
1190   struct tree_base base;
1191   tree type;
1192 };
1193
1194 struct GTY(()) tree_common {
1195   struct tree_typed typed;
1196   tree chain;
1197 };
1198
1199 struct GTY(()) tree_int_cst {
1200   struct tree_typed typed;
1201   HOST_WIDE_INT val[1];
1202 };
1203
1204
1205 struct GTY(()) tree_real_cst {
1206   struct tree_typed typed;
1207   struct real_value * real_cst_ptr;
1208 };
1209
1210 struct GTY(()) tree_fixed_cst {
1211   struct tree_typed typed;
1212   struct fixed_value * fixed_cst_ptr;
1213 };
1214
1215 struct GTY(()) tree_string {
1216   struct tree_typed typed;
1217   int length;
1218   char str[1];
1219 };
1220
1221 struct GTY(()) tree_complex {
1222   struct tree_typed typed;
1223   tree real;
1224   tree imag;
1225 };
1226
1227 struct GTY(()) tree_vector {
1228   struct tree_typed typed;
1229   tree GTY ((length ("TYPE_VECTOR_SUBPARTS (TREE_TYPE ((tree)&%h))"))) elts[1];
1230 };
1231
1232 struct GTY(()) tree_identifier {
1233   struct tree_common common;
1234   struct ht_identifier id;
1235 };
1236
1237 struct GTY(()) tree_list {
1238   struct tree_common common;
1239   tree purpose;
1240   tree value;
1241 };
1242
1243 struct GTY(()) tree_vec {
1244   struct tree_common common;
1245   tree GTY ((length ("TREE_VEC_LENGTH ((tree)&%h)"))) a[1];
1246 };
1247
1248 /* A single element of a CONSTRUCTOR. VALUE holds the actual value of the
1249    element. INDEX can optionally design the position of VALUE: in arrays,
1250    it is the index where VALUE has to be placed; in structures, it is the
1251    FIELD_DECL of the member.  */
1252 struct GTY(()) constructor_elt {
1253   tree index;
1254   tree value;
1255 };
1256
1257 struct GTY(()) tree_constructor {
1258   struct tree_typed typed;
1259   vec<constructor_elt, va_gc> *elts;
1260 };
1261
1262 enum omp_clause_depend_kind
1263 {
1264   OMP_CLAUSE_DEPEND_IN,
1265   OMP_CLAUSE_DEPEND_OUT,
1266   OMP_CLAUSE_DEPEND_INOUT,
1267   OMP_CLAUSE_DEPEND_SOURCE,
1268   OMP_CLAUSE_DEPEND_SINK,
1269   OMP_CLAUSE_DEPEND_LAST
1270 };
1271
1272 enum omp_clause_proc_bind_kind
1273 {
1274   /* Numbers should match omp_proc_bind_t enum in omp.h.  */
1275   OMP_CLAUSE_PROC_BIND_FALSE = 0,
1276   OMP_CLAUSE_PROC_BIND_TRUE = 1,
1277   OMP_CLAUSE_PROC_BIND_MASTER = 2,
1278   OMP_CLAUSE_PROC_BIND_CLOSE = 3,
1279   OMP_CLAUSE_PROC_BIND_SPREAD = 4,
1280   OMP_CLAUSE_PROC_BIND_LAST
1281 };
1282
1283 enum omp_clause_linear_kind
1284 {
1285   OMP_CLAUSE_LINEAR_DEFAULT,
1286   OMP_CLAUSE_LINEAR_REF,
1287   OMP_CLAUSE_LINEAR_VAL,
1288   OMP_CLAUSE_LINEAR_UVAL
1289 };
1290
1291 struct GTY(()) tree_exp {
1292   struct tree_typed typed;
1293   location_t locus;
1294   tree GTY ((special ("tree_exp"),
1295              desc ("TREE_CODE ((tree) &%0)")))
1296     operands[1];
1297 };
1298
1299 /* Immediate use linking structure.  This structure is used for maintaining
1300    a doubly linked list of uses of an SSA_NAME.  */
1301 struct GTY(()) ssa_use_operand_t {
1302   struct ssa_use_operand_t* GTY((skip(""))) prev;
1303   struct ssa_use_operand_t* GTY((skip(""))) next;
1304   /* Immediate uses for a given SSA name are maintained as a cyclic
1305      list.  To recognize the root of this list, the location field
1306      needs to point to the original SSA name.  Since statements and
1307      SSA names are of different data types, we need this union.  See
1308      the explanation in struct imm_use_iterator.  */
1309   union { gimple *stmt; tree ssa_name; } GTY((skip(""))) loc;
1310   tree *GTY((skip(""))) use;
1311 };
1312
1313 struct GTY(()) tree_ssa_name {
1314   struct tree_typed typed;
1315
1316   /* _DECL wrapped by this SSA name.  */
1317   tree var;
1318
1319   /* Statement that defines this SSA name.  */
1320   gimple *def_stmt;
1321
1322   /* Value range information.  */
1323   union ssa_name_info_type {
1324     /* Pointer attributes used for alias analysis.  */
1325     struct GTY ((tag ("0"))) ptr_info_def *ptr_info;
1326     /* Value range attributes used for zero/sign extension elimination.  */
1327     struct GTY ((tag ("1"))) range_info_def *range_info;
1328   } GTY ((desc ("%1.typed.type ?" \
1329                 "!POINTER_TYPE_P (TREE_TYPE ((tree)&%1)) : 2"))) info;
1330
1331   /* Immediate uses list for this SSA_NAME.  */
1332   struct ssa_use_operand_t imm_uses;
1333 };
1334
1335 struct GTY(()) phi_arg_d {
1336   /* imm_use MUST be the first element in struct because we do some
1337      pointer arithmetic with it.  See phi_arg_index_from_use.  */
1338   struct ssa_use_operand_t imm_use;
1339   tree def;
1340   location_t locus;
1341 };
1342
1343 struct GTY(()) tree_omp_clause {
1344   struct tree_common common;
1345   location_t locus;
1346   enum omp_clause_code code;
1347   union omp_clause_subcode {
1348     enum omp_clause_default_kind   default_kind;
1349     enum omp_clause_schedule_kind  schedule_kind;
1350     enum omp_clause_depend_kind    depend_kind;
1351     /* See include/gomp-constants.h for enum gomp_map_kind's values.  */
1352     unsigned int                   map_kind;
1353     enum omp_clause_proc_bind_kind proc_bind_kind;
1354     enum tree_code                 reduction_code;
1355     enum omp_clause_linear_kind    linear_kind;
1356     enum tree_code                 if_modifier;
1357   } GTY ((skip)) subcode;
1358
1359   /* The gimplification of OMP_CLAUSE_REDUCTION_{INIT,MERGE} for omp-low's
1360      usage.  */
1361   gimple_seq gimple_reduction_init;
1362   gimple_seq gimple_reduction_merge;
1363
1364   tree GTY ((length ("omp_clause_num_ops[OMP_CLAUSE_CODE ((tree)&%h)]")))
1365     ops[1];
1366 };
1367
1368 struct GTY(()) tree_block {
1369   struct tree_base base;
1370   tree chain;
1371
1372   unsigned abstract_flag : 1;
1373   unsigned block_num : 31;
1374
1375   location_t locus;
1376   location_t end_locus;
1377
1378   tree vars;
1379   vec<tree, va_gc> *nonlocalized_vars;
1380
1381   tree subblocks;
1382   tree supercontext;
1383   tree abstract_origin;
1384   tree fragment_origin;
1385   tree fragment_chain;
1386
1387   /* Pointer to the DWARF lexical block.  */
1388   struct die_struct *die;
1389 };
1390
1391 struct GTY(()) tree_type_common {
1392   struct tree_common common;
1393   tree size;
1394   tree size_unit;
1395   tree attributes;
1396   unsigned int uid;
1397
1398   unsigned int precision : 10;
1399   unsigned no_force_blk_flag : 1;
1400   unsigned needs_constructing_flag : 1;
1401   unsigned transparent_aggr_flag : 1;
1402   unsigned restrict_flag : 1;
1403   unsigned contains_placeholder_bits : 2;
1404
1405   ENUM_BITFIELD(machine_mode) mode : 8;
1406
1407   unsigned string_flag : 1;
1408   unsigned lang_flag_0 : 1;
1409   unsigned lang_flag_1 : 1;
1410   unsigned lang_flag_2 : 1;
1411   unsigned lang_flag_3 : 1;
1412   unsigned lang_flag_4 : 1;
1413   unsigned lang_flag_5 : 1;
1414   unsigned lang_flag_6 : 1;
1415
1416   unsigned int align;
1417   alias_set_type alias_set;
1418   tree pointer_to;
1419   tree reference_to;
1420   union tree_type_symtab {
1421     int GTY ((tag ("TYPE_SYMTAB_IS_ADDRESS"))) address;
1422     const char * GTY ((tag ("TYPE_SYMTAB_IS_POINTER"))) pointer;
1423     struct die_struct * GTY ((tag ("TYPE_SYMTAB_IS_DIE"))) die;
1424   } GTY ((desc ("debug_hooks->tree_type_symtab_field"))) symtab;
1425   tree canonical;
1426   tree next_variant;
1427   tree main_variant;
1428   tree context;
1429   tree name;
1430 };
1431
1432 struct GTY(()) tree_type_with_lang_specific {
1433   struct tree_type_common common;
1434   /* Points to a structure whose details depend on the language in use.  */
1435   struct lang_type *lang_specific;
1436 };
1437
1438 struct GTY(()) tree_type_non_common {
1439   struct tree_type_with_lang_specific with_lang_specific;
1440   tree values;
1441   tree minval;
1442   tree maxval;
1443   tree binfo;
1444 };
1445
1446 struct GTY (()) tree_binfo {
1447   struct tree_common common;
1448
1449   tree offset;
1450   tree vtable;
1451   tree virtuals;
1452   tree vptr_field;
1453   vec<tree, va_gc> *base_accesses;
1454   tree inheritance;
1455
1456   tree vtt_subvtt;
1457   tree vtt_vptr;
1458
1459   vec<tree, va_gc> base_binfos;
1460 };
1461
1462 struct GTY(()) tree_decl_minimal {
1463   struct tree_common common;
1464   location_t locus;
1465   unsigned int uid;
1466   tree name;
1467   tree context;
1468 };
1469
1470 struct GTY(()) tree_decl_common {
1471   struct tree_decl_minimal common;
1472   tree size;
1473
1474   ENUM_BITFIELD(machine_mode) mode : 8;
1475
1476   unsigned nonlocal_flag : 1;
1477   unsigned virtual_flag : 1;
1478   unsigned ignored_flag : 1;
1479   unsigned abstract_flag : 1;
1480   unsigned artificial_flag : 1;
1481   unsigned preserve_flag: 1;
1482   unsigned debug_expr_is_from : 1;
1483
1484   unsigned lang_flag_0 : 1;
1485   unsigned lang_flag_1 : 1;
1486   unsigned lang_flag_2 : 1;
1487   unsigned lang_flag_3 : 1;
1488   unsigned lang_flag_4 : 1;
1489   unsigned lang_flag_5 : 1;
1490   unsigned lang_flag_6 : 1;
1491   unsigned lang_flag_7 : 1;
1492   unsigned lang_flag_8 : 1;
1493
1494   /* In VAR_DECL and PARM_DECL, this is DECL_REGISTER.  */
1495   unsigned decl_flag_0 : 1;
1496   /* In FIELD_DECL, this is DECL_BIT_FIELD
1497      In VAR_DECL and FUNCTION_DECL, this is DECL_EXTERNAL.
1498      In TYPE_DECL, this is TYPE_DECL_SUPPRESS_DEBUG.  */
1499   unsigned decl_flag_1 : 1;
1500   /* In FIELD_DECL, this is DECL_NONADDRESSABLE_P
1501      In VAR_DECL, PARM_DECL and RESULT_DECL, this is
1502      DECL_HAS_VALUE_EXPR_P.  */
1503   unsigned decl_flag_2 : 1;
1504   /* 1 bit unused.  */
1505   unsigned decl_flag_3 : 1;
1506   /* Logically, these two would go in a theoretical base shared by var and
1507      parm decl. */
1508   unsigned gimple_reg_flag : 1;
1509   /* In VAR_DECL, PARM_DECL and RESULT_DECL, this is DECL_BY_REFERENCE.  */
1510   unsigned decl_by_reference_flag : 1;
1511   /* In a VAR_DECL and PARM_DECL, this is DECL_READ_P.  */
1512   unsigned decl_read_flag : 1;
1513   /* In a VAR_DECL or RESULT_DECL, this is DECL_NONSHAREABLE.  */
1514   unsigned decl_nonshareable_flag : 1;
1515
1516   /* DECL_OFFSET_ALIGN, used only for FIELD_DECLs.  */
1517   unsigned int off_align : 8;
1518
1519   /* 24 bits unused.  */
1520
1521   /* DECL_ALIGN.  It should have the same size as TYPE_ALIGN.  */
1522   unsigned int align;
1523
1524   /* UID for points-to sets, stable over copying from inlining.  */
1525   unsigned int pt_uid;
1526
1527   tree size_unit;
1528   tree initial;
1529   tree attributes;
1530   tree abstract_origin;
1531
1532   /* Points to a structure whose details depend on the language in use.  */
1533   struct lang_decl *lang_specific;
1534 };
1535
1536 struct GTY(()) tree_decl_with_rtl {
1537   struct tree_decl_common common;
1538   rtx rtl;
1539 };
1540
1541 struct GTY(()) tree_field_decl {
1542   struct tree_decl_common common;
1543
1544   tree offset;
1545   tree bit_field_type;
1546   tree qualifier;
1547   tree bit_offset;
1548   tree fcontext;
1549 };
1550
1551 struct GTY(()) tree_label_decl {
1552   struct tree_decl_with_rtl common;
1553   int label_decl_uid;
1554   int eh_landing_pad_nr;
1555 };
1556
1557 struct GTY(()) tree_result_decl {
1558   struct tree_decl_with_rtl common;
1559 };
1560
1561 struct GTY(()) tree_const_decl {
1562   struct tree_decl_common common;
1563 };
1564
1565 struct GTY(()) tree_parm_decl {
1566   struct tree_decl_with_rtl common;
1567   rtx incoming_rtl;
1568 };
1569
1570 struct GTY(()) tree_decl_with_vis {
1571  struct tree_decl_with_rtl common;
1572  tree assembler_name;
1573  struct symtab_node *symtab_node;
1574
1575  /* Belong to VAR_DECL exclusively.  */
1576  unsigned defer_output : 1;
1577  unsigned hard_register : 1;
1578  unsigned common_flag : 1;
1579  unsigned in_text_section : 1;
1580  unsigned in_constant_pool : 1;
1581  unsigned dllimport_flag : 1;
1582  /* Don't belong to VAR_DECL exclusively.  */
1583  unsigned weak_flag : 1;
1584
1585  unsigned seen_in_bind_expr : 1;
1586  unsigned comdat_flag : 1;
1587  /* Used for FUNCTION_DECL, VAR_DECL and in C++ for TYPE_DECL.  */
1588  ENUM_BITFIELD(symbol_visibility) visibility : 2;
1589  unsigned visibility_specified : 1;
1590
1591  /* Belong to FUNCTION_DECL exclusively.  */
1592  unsigned init_priority_p : 1;
1593  /* Used by C++ only.  Might become a generic decl flag.  */
1594  unsigned shadowed_for_var_p : 1;
1595  /* Belong to FUNCTION_DECL exclusively.  */
1596  unsigned cxx_constructor : 1;
1597  /* Belong to FUNCTION_DECL exclusively.  */
1598  unsigned cxx_destructor : 1;
1599  /* Belong to FUNCTION_DECL exclusively.  */
1600  unsigned final : 1;
1601  /* Belong to FUNCTION_DECL exclusively.  */
1602  unsigned regdecl_flag : 1;
1603  /* 14 unused bits. */
1604 };
1605
1606 struct GTY(()) tree_var_decl {
1607   struct tree_decl_with_vis common;
1608 };
1609
1610 struct GTY(()) tree_decl_non_common {
1611   struct tree_decl_with_vis common;
1612   /* Almost all FE's use this.  */
1613   tree result;
1614 };
1615
1616 /* FUNCTION_DECL inherits from DECL_NON_COMMON because of the use of the
1617    arguments/result/saved_tree fields by front ends.   It was either inherit
1618    FUNCTION_DECL from non_common, or inherit non_common from FUNCTION_DECL,
1619    which seemed a bit strange.  */
1620
1621 struct GTY(()) tree_function_decl {
1622   struct tree_decl_non_common common;
1623
1624   struct function *f;
1625
1626   /* Arguments of the function.  */
1627   tree arguments;
1628   /* The personality function. Used for stack unwinding. */
1629   tree personality;
1630
1631   /* Function specific options that are used by this function.  */
1632   tree function_specific_target;        /* target options */
1633   tree function_specific_optimization;  /* optimization options */
1634
1635   /* Generic function body.  */
1636   tree saved_tree;
1637   /* Index within a virtual table.  */
1638   tree vindex;
1639
1640   /* In a FUNCTION_DECL for which DECL_BUILT_IN holds, this is
1641      DECL_FUNCTION_CODE.  Otherwise unused.
1642      ???  The bitfield needs to be able to hold all target function
1643           codes as well.  */
1644   ENUM_BITFIELD(built_in_function) function_code : 12;
1645   ENUM_BITFIELD(built_in_class) built_in_class : 2;
1646
1647   unsigned static_ctor_flag : 1;
1648   unsigned static_dtor_flag : 1;
1649
1650   unsigned uninlinable : 1;
1651   unsigned possibly_inlined : 1;
1652   unsigned novops_flag : 1;
1653   unsigned returns_twice_flag : 1;
1654   unsigned malloc_flag : 1;
1655   unsigned operator_new_flag : 1;
1656   unsigned declared_inline_flag : 1;
1657   unsigned no_inline_warning_flag : 1;
1658
1659   unsigned no_instrument_function_entry_exit : 1;
1660   unsigned no_limit_stack : 1;
1661   unsigned disregard_inline_limits : 1;
1662   unsigned pure_flag : 1;
1663   unsigned looping_const_or_pure_flag : 1;
1664   unsigned has_debug_args_flag : 1;
1665   unsigned tm_clone_flag : 1;
1666   unsigned versioned_function : 1;
1667   /* No bits left.  */
1668 };
1669
1670 struct GTY(()) tree_translation_unit_decl {
1671   struct tree_decl_common common;
1672   /* Source language of this translation unit.  Used for DWARF output.  */
1673   const char * GTY((skip(""))) language;
1674   /* TODO: Non-optimization used to build this translation unit.  */
1675   /* TODO: Root of a partial DWARF tree for global types and decls.  */
1676 };
1677
1678 struct GTY(()) tree_type_decl {
1679   struct tree_decl_non_common common;
1680
1681 };
1682
1683 struct GTY ((chain_next ("%h.next"), chain_prev ("%h.prev"))) tree_statement_list_node
1684  {
1685   struct tree_statement_list_node *prev;
1686   struct tree_statement_list_node *next;
1687   tree stmt;
1688 };
1689
1690 struct GTY(()) tree_statement_list
1691  {
1692   struct tree_typed typed;
1693   struct tree_statement_list_node *head;
1694   struct tree_statement_list_node *tail;
1695 };
1696
1697
1698 /* Optimization options used by a function.  */
1699
1700 struct GTY(()) tree_optimization_option {
1701   struct tree_common common;
1702
1703   /* The optimization options used by the user.  */
1704   struct cl_optimization *opts;
1705
1706   /* Target optabs for this set of optimization options.  This is of
1707      type `struct target_optabs *'.  */
1708   void *GTY ((atomic)) optabs;
1709
1710   /* The value of this_target_optabs against which the optabs above were
1711      generated.  */
1712   struct target_optabs *GTY ((skip)) base_optabs;
1713 };
1714
1715 /* Forward declaration, defined in target-globals.h.  */
1716
1717 struct GTY(()) target_globals;
1718
1719 /* Target options used by a function.  */
1720
1721 struct GTY(()) tree_target_option {
1722   struct tree_common common;
1723
1724   /* Target globals for the corresponding target option.  */
1725   struct target_globals *globals;
1726
1727   /* The optimization options used by the user.  */
1728   struct cl_target_option *opts;
1729 };
1730
1731 /* Define the overall contents of a tree node.
1732    It may be any of the structures declared above
1733    for various types of node.  */
1734 union GTY ((ptr_alias (union lang_tree_node),
1735             desc ("tree_node_structure (&%h)"), variable_size)) tree_node {
1736   struct tree_base GTY ((tag ("TS_BASE"))) base;
1737   struct tree_typed GTY ((tag ("TS_TYPED"))) typed;
1738   struct tree_common GTY ((tag ("TS_COMMON"))) common;
1739   struct tree_int_cst GTY ((tag ("TS_INT_CST"))) int_cst;
1740   struct tree_real_cst GTY ((tag ("TS_REAL_CST"))) real_cst;
1741   struct tree_fixed_cst GTY ((tag ("TS_FIXED_CST"))) fixed_cst;
1742   struct tree_vector GTY ((tag ("TS_VECTOR"))) vector;
1743   struct tree_string GTY ((tag ("TS_STRING"))) string;
1744   struct tree_complex GTY ((tag ("TS_COMPLEX"))) complex;
1745   struct tree_identifier GTY ((tag ("TS_IDENTIFIER"))) identifier;
1746   struct tree_decl_minimal GTY((tag ("TS_DECL_MINIMAL"))) decl_minimal;
1747   struct tree_decl_common GTY ((tag ("TS_DECL_COMMON"))) decl_common;
1748   struct tree_decl_with_rtl GTY ((tag ("TS_DECL_WRTL"))) decl_with_rtl;
1749   struct tree_decl_non_common  GTY ((tag ("TS_DECL_NON_COMMON")))
1750     decl_non_common;
1751   struct tree_parm_decl  GTY  ((tag ("TS_PARM_DECL"))) parm_decl;
1752   struct tree_decl_with_vis GTY ((tag ("TS_DECL_WITH_VIS"))) decl_with_vis;
1753   struct tree_var_decl GTY ((tag ("TS_VAR_DECL"))) var_decl;
1754   struct tree_field_decl GTY ((tag ("TS_FIELD_DECL"))) field_decl;
1755   struct tree_label_decl GTY ((tag ("TS_LABEL_DECL"))) label_decl;
1756   struct tree_result_decl GTY ((tag ("TS_RESULT_DECL"))) result_decl;
1757   struct tree_const_decl GTY ((tag ("TS_CONST_DECL"))) const_decl;
1758   struct tree_type_decl GTY ((tag ("TS_TYPE_DECL"))) type_decl;
1759   struct tree_function_decl GTY ((tag ("TS_FUNCTION_DECL"))) function_decl;
1760   struct tree_translation_unit_decl GTY ((tag ("TS_TRANSLATION_UNIT_DECL")))
1761     translation_unit_decl;
1762   struct tree_type_common GTY ((tag ("TS_TYPE_COMMON"))) type_common;
1763   struct tree_type_with_lang_specific GTY ((tag ("TS_TYPE_WITH_LANG_SPECIFIC")))
1764     type_with_lang_specific;
1765   struct tree_type_non_common GTY ((tag ("TS_TYPE_NON_COMMON")))
1766     type_non_common;
1767   struct tree_list GTY ((tag ("TS_LIST"))) list;
1768   struct tree_vec GTY ((tag ("TS_VEC"))) vec;
1769   struct tree_exp GTY ((tag ("TS_EXP"))) exp;
1770   struct tree_ssa_name GTY ((tag ("TS_SSA_NAME"))) ssa_name;
1771   struct tree_block GTY ((tag ("TS_BLOCK"))) block;
1772   struct tree_binfo GTY ((tag ("TS_BINFO"))) binfo;
1773   struct tree_statement_list GTY ((tag ("TS_STATEMENT_LIST"))) stmt_list;
1774   struct tree_constructor GTY ((tag ("TS_CONSTRUCTOR"))) constructor;
1775   struct tree_omp_clause GTY ((tag ("TS_OMP_CLAUSE"))) omp_clause;
1776   struct tree_optimization_option GTY ((tag ("TS_OPTIMIZATION"))) optimization;
1777   struct tree_target_option GTY ((tag ("TS_TARGET_OPTION"))) target_option;
1778 };
1779
1780 /* Structure describing an attribute and a function to handle it.  */
1781 struct attribute_spec {
1782   /* The name of the attribute (without any leading or trailing __),
1783      or NULL to mark the end of a table of attributes.  */
1784   const char *name;
1785   /* The minimum length of the list of arguments of the attribute.  */
1786   int min_length;
1787   /* The maximum length of the list of arguments of the attribute
1788      (-1 for no maximum).  */
1789   int max_length;
1790   /* Whether this attribute requires a DECL.  If it does, it will be passed
1791      from types of DECLs, function return types and array element types to
1792      the DECLs, function types and array types respectively; but when
1793      applied to a type in any other circumstances, it will be ignored with
1794      a warning.  (If greater control is desired for a given attribute,
1795      this should be false, and the flags argument to the handler may be
1796      used to gain greater control in that case.)  */
1797   bool decl_required;
1798   /* Whether this attribute requires a type.  If it does, it will be passed
1799      from a DECL to the type of that DECL.  */
1800   bool type_required;
1801   /* Whether this attribute requires a function (or method) type.  If it does,
1802      it will be passed from a function pointer type to the target type,
1803      and from a function return type (which is not itself a function
1804      pointer type) to the function type.  */
1805   bool function_type_required;
1806   /* Function to handle this attribute.  NODE points to the node to which
1807      the attribute is to be applied.  If a DECL, it should be modified in
1808      place; if a TYPE, a copy should be created.  NAME is the name of the
1809      attribute (possibly with leading or trailing __).  ARGS is the TREE_LIST
1810      of the arguments (which may be NULL).  FLAGS gives further information
1811      about the context of the attribute.  Afterwards, the attributes will
1812      be added to the DECL_ATTRIBUTES or TYPE_ATTRIBUTES, as appropriate,
1813      unless *NO_ADD_ATTRS is set to true (which should be done on error,
1814      as well as in any other cases when the attributes should not be added
1815      to the DECL or TYPE).  Depending on FLAGS, any attributes to be
1816      applied to another type or DECL later may be returned;
1817      otherwise the return value should be NULL_TREE.  This pointer may be
1818      NULL if no special handling is required beyond the checks implied
1819      by the rest of this structure.  */
1820   tree (*handler) (tree *node, tree name, tree args,
1821                    int flags, bool *no_add_attrs);
1822   /* Specifies if attribute affects type's identity.  */
1823   bool affects_type_identity;
1824 };
1825
1826 /* These functions allow a front-end to perform a manual layout of a
1827    RECORD_TYPE.  (For instance, if the placement of subsequent fields
1828    depends on the placement of fields so far.)  Begin by calling
1829    start_record_layout.  Then, call place_field for each of the
1830    fields.  Then, call finish_record_layout.  See layout_type for the
1831    default way in which these functions are used.  */
1832 typedef struct record_layout_info_s {
1833   /* The RECORD_TYPE that we are laying out.  */
1834   tree t;
1835   /* The offset into the record so far, in bytes, not including bits in
1836      BITPOS.  */
1837   tree offset;
1838   /* The last known alignment of SIZE.  */
1839   unsigned int offset_align;
1840   /* The bit position within the last OFFSET_ALIGN bits, in bits.  */
1841   tree bitpos;
1842   /* The alignment of the record so far, in bits.  */
1843   unsigned int record_align;
1844   /* The alignment of the record so far, ignoring #pragma pack and
1845      __attribute__ ((packed)), in bits.  */
1846   unsigned int unpacked_align;
1847   /* The previous field laid out.  */
1848   tree prev_field;
1849   /* The static variables (i.e., class variables, as opposed to
1850      instance variables) encountered in T.  */
1851   vec<tree, va_gc> *pending_statics;
1852   /* Bits remaining in the current alignment group */
1853   int remaining_in_alignment;
1854   /* True if we've seen a packed field that didn't have normal
1855      alignment anyway.  */
1856   int packed_maybe_necessary;
1857 } *record_layout_info;
1858
1859 /* Iterator for going through the function arguments.  */
1860 struct function_args_iterator {
1861   tree next;                    /* TREE_LIST pointing to the next argument */
1862 };
1863
1864 /* Structures to map from a tree to another tree.  */
1865 struct GTY(()) tree_map_base {
1866   tree from;
1867 };
1868
1869 /* Map from a tree to another tree.  */
1870
1871 struct GTY((for_user)) tree_map {
1872   struct tree_map_base base;
1873   unsigned int hash;
1874   tree to;
1875 };
1876
1877 /* Map from a decl tree to another tree.  */
1878 struct GTY((for_user)) tree_decl_map {
1879   struct tree_map_base base;
1880   tree to;
1881 };
1882
1883 /* Map from a tree to an int.  */
1884 struct GTY((for_user)) tree_int_map {
1885   struct tree_map_base base;
1886   unsigned int to;
1887 };
1888
1889 /* Map from a decl tree to a tree vector.  */
1890 struct GTY((for_user)) tree_vec_map {
1891   struct tree_map_base base;
1892   vec<tree, va_gc> *to;
1893 };
1894
1895 /* Abstract iterators for CALL_EXPRs.  These static inline definitions
1896    have to go towards the end of tree.h so that union tree_node is fully
1897    defined by this point.  */
1898
1899 /* Structure containing iterator state.  */
1900 struct call_expr_arg_iterator {
1901   tree t;       /* the call_expr */
1902   int n;        /* argument count */
1903   int i;        /* next argument index */
1904 };
1905
1906 struct const_call_expr_arg_iterator {
1907   const_tree t; /* the call_expr */
1908   int n;        /* argument count */
1909   int i;        /* next argument index */
1910 };
1911
1912 /* The builtin_info structure holds the FUNCTION_DECL of the standard builtin
1913    function, and flags.  */
1914 struct GTY(()) builtin_info_type {
1915   tree decl;
1916   /* Whether the user can use <xxx> instead of explicitly using calls
1917      to __builtin_<xxx>.  */
1918   unsigned implicit_p : 1;
1919   /* Whether the user has provided a declaration of <xxx>.  */
1920   unsigned declared_p : 1;
1921 };
1922
1923
1924 /*---------------------------------------------------------------------------
1925                                 Global variables
1926 ---------------------------------------------------------------------------*/
1927 /* Matrix describing the structures contained in a given tree code.  */
1928 extern unsigned char tree_contains_struct[MAX_TREE_CODES][64];
1929
1930 /* Class of tree given its code.  */
1931 extern const enum tree_code_class tree_code_type[];
1932
1933 /* Each tree code class has an associated string representation.
1934    These must correspond to the tree_code_class entries.  */
1935 extern const char *const tree_code_class_strings[];
1936
1937 /* Number of argument-words in each kind of tree-node.  */
1938 extern const unsigned char tree_code_length[];
1939
1940 /* Vector of all alias pairs for global symbols.  */
1941 extern GTY(()) vec<alias_pair, va_gc> *alias_pairs;
1942
1943 /* Names of all the built_in classes.  */
1944 extern const char *const built_in_class_names[BUILT_IN_LAST];
1945
1946 /* Names of all the built_in functions.  */
1947 extern const char * built_in_names[(int) END_BUILTINS];
1948
1949 /* Number of operands and names for each OMP_CLAUSE node.  */
1950 extern unsigned const char omp_clause_num_ops[];
1951 extern const char * const omp_clause_code_name[];
1952
1953 /* A vector of all translation-units.  */
1954 extern GTY (()) vec<tree, va_gc> *all_translation_units;
1955
1956 /* Vector of standard trees used by the C compiler.  */
1957 extern GTY(()) tree global_trees[TI_MAX];
1958
1959 /* The standard C integer types.  Use integer_type_kind to index into
1960    this array.  */
1961 extern GTY(()) tree integer_types[itk_none];
1962
1963 /* Types used to represent sizes.  */
1964 extern GTY(()) tree sizetype_tab[(int) stk_type_kind_last];
1965
1966 /* Arrays for keeping track of tree node statistics.  */
1967 extern int tree_node_counts[];
1968 extern int tree_node_sizes[];
1969
1970 /* True if we are in gimple form and the actions of the folders need to
1971    be restricted.  False if we are not in gimple form and folding is not
1972    restricted to creating gimple expressions.  */
1973 extern bool in_gimple_form;
1974
1975 /* Functional interface to the builtin functions.  */
1976 extern GTY(()) builtin_info_type builtin_info[(int)END_BUILTINS];
1977
1978 /* If nonzero, an upper limit on alignment of structure fields, in bits,  */
1979 extern unsigned int maximum_field_alignment;
1980
1981 /* Points to the FUNCTION_DECL of the function whose body we are reading.  */
1982 extern GTY(()) tree current_function_decl;
1983
1984 /* Nonzero means a FUNC_BEGIN label was emitted.  */
1985 extern GTY(()) const char * current_function_func_begin_label;
1986
1987 #endif  // GCC_TREE_CORE_H