gcc/tree-core.h

   1 /* Core data structures for the 'tree' type.
   2    Copyright (C) 1989-2023 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 die_struct;
  37
  38
  39 /*---------------------------------------------------------------------------
  40                               #defined constants
  41 ---------------------------------------------------------------------------*/
  42 /* Nonzero if this is a call to a function whose return value depends
  43    solely on its arguments, has no side effects, and does not read
  44    global memory.  This corresponds to TREE_READONLY for function
  45    decls.  */
  46 #define ECF_CONST                 (1 << 0)
  47
  48 /* Nonzero if this is a call to "pure" function (like const function,
  49    but may read memory.  This corresponds to DECL_PURE_P for function
  50    decls.  */
  51 #define ECF_PURE                  (1 << 1)
  52
  53 /* Nonzero if this is ECF_CONST or ECF_PURE but cannot be proven to no
  54    infinite loop.  This corresponds to DECL_LOOPING_CONST_OR_PURE_P
  55    for function decls.*/
  56 #define ECF_LOOPING_CONST_OR_PURE (1 << 2)
  57
  58 /* Nonzero if this call will never return.  */
  59 #define ECF_NORETURN              (1 << 3)
  60
  61 /* Nonzero if this is a call to malloc or a related function.  */
  62 #define ECF_MALLOC                (1 << 4)
  63
  64 /* Nonzero if it is plausible that this is a call to alloca.  */
  65 #define ECF_MAY_BE_ALLOCA         (1 << 5)
  66
  67 /* Nonzero if this is a call to a function that won't throw an exception.  */
  68 #define ECF_NOTHROW               (1 << 6)
  69
  70 /* Nonzero if this is a call to setjmp or a related function.  */
  71 #define ECF_RETURNS_TWICE         (1 << 7)
  72
  73 /* Nonzero if this call replaces the current stack frame.  */
  74 #define ECF_SIBCALL               (1 << 8)
  75
  76 /* Function does not read or write memory (but may have side effects, so
  77    it does not necessarily fit ECF_CONST).  */
  78 #define ECF_NOVOPS                (1 << 9)
  79
  80 /* The function does not lead to calls within current function unit.  */
  81 #define ECF_LEAF                  (1 << 10)
  82
  83 /* Nonzero if this call returns its first argument.  */
  84 #define ECF_RET1                  (1 << 11)
  85
  86 /* Nonzero if this call does not affect transactions.  */
  87 #define ECF_TM_PURE               (1 << 12)
  88
  89 /* Nonzero if this call is into the transaction runtime library.  */
  90 #define ECF_TM_BUILTIN            (1 << 13)
  91
  92 /* Nonzero if this is an indirect call by descriptor.  */
  93 #define ECF_BY_DESCRIPTOR         (1 << 14)
  94
  95 /* Nonzero if this is a cold function.  */
  96 #define ECF_COLD                  (1 << 15)
  97
  98 /* Call argument flags.  */
  99
 100 /* Nonzero if the argument is not used by the function.  */
 101 #define EAF_UNUSED              (1 << 1)
 102
 103 /* Following flags come in pairs.  First one is about direct dereferences
 104    from the parameter, while the second is about memory reachable by
 105    recursive dereferences.  */
 106
 107 /* Nonzero if memory reached by the argument is not clobbered.  */
 108 #define EAF_NO_DIRECT_CLOBBER   (1 << 2)
 109 #define EAF_NO_INDIRECT_CLOBBER (1 << 3)
 110
 111 /* Nonzero if the argument does not escape.  */
 112 #define EAF_NO_DIRECT_ESCAPE    (1 << 4)
 113 #define EAF_NO_INDIRECT_ESCAPE  (1 << 5)
 114
 115 /* Nonzero if the argument does not escape to return value.  */
 116 #define EAF_NOT_RETURNED_DIRECTLY (1 << 6)
 117 #define EAF_NOT_RETURNED_INDIRECTLY (1 << 7)
 118
 119 /* Nonzero if the argument is not read.  */
 120 #define EAF_NO_DIRECT_READ      (1 << 8)
 121 #define EAF_NO_INDIRECT_READ    (1 << 9)
 122
 123 /* Call return flags.  */
 124 /* Mask for the argument number that is returned.  Lower two bits of
 125    the return flags, encodes argument slots zero to three.  */
 126 #define ERF_RETURN_ARG_MASK     (3)
 127
 128 /* Nonzero if the return value is equal to the argument number
 129    flags & ERF_RETURN_ARG_MASK.  */
 130 #define ERF_RETURNS_ARG         (1 << 2)
 131
 132 /* Nonzero if the return value does not alias with anything.  Functions
 133    with the malloc attribute have this set on their return value.  */
 134 #define ERF_NOALIAS             (1 << 3)
 135
 136
 137 /*---------------------------------------------------------------------------
 138                                   Enumerations
 139 ---------------------------------------------------------------------------*/
 140 /* Codes of tree nodes.  */
 141 #define DEFTREECODE(SYM, STRING, TYPE, NARGS)   SYM,
 142 #define END_OF_BASE_TREE_CODES LAST_AND_UNUSED_TREE_CODE,
 143
 144 enum tree_code {
 145 #include "all-tree.def"
 146 MAX_TREE_CODES
 147 };
 148
 149 #undef DEFTREECODE
 150 #undef END_OF_BASE_TREE_CODES
 151
 152 /* Number of language-independent tree codes.  */
 153 #define NUM_TREE_CODES \
 154   ((int) LAST_AND_UNUSED_TREE_CODE)
 155
 156 #define CODE_CONTAINS_STRUCT(CODE, STRUCT) \
 157   (tree_contains_struct[(CODE)][(STRUCT)])
 158
 159
 160 /* Classify which part of the compiler has defined a given builtin function.
 161    Note that we assume below that this is no more than two bits.  */
 162 enum built_in_class {
 163   NOT_BUILT_IN = 0,
 164   BUILT_IN_FRONTEND,
 165   BUILT_IN_MD,
 166   BUILT_IN_NORMAL
 167 };
 168
 169 /* Last marker used for LTO stremaing of built_in_class.  We cannot add it
 170    to the enum since we need the enumb to fit in 2 bits.  */
 171 #define BUILT_IN_LAST (BUILT_IN_NORMAL + 1)
 172
 173 /* Codes that identify the various built in functions
 174    so that expand_call can identify them quickly.  */
 175 #define DEF_BUILTIN(ENUM, N, C, T, LT, B, F, NA, AT, IM, COND) ENUM,
 176 enum built_in_function {
 177 #include "builtins.def"
 178   /* Complex division routines in libgcc.  These are done via builtins
 179      because emit_library_call_value can't handle complex values.  */
 180   BUILT_IN_COMPLEX_MUL_MIN,
 181   BUILT_IN_COMPLEX_MUL_MAX
 182     = BUILT_IN_COMPLEX_MUL_MIN
 183       + MAX_MODE_COMPLEX_FLOAT
 184       - MIN_MODE_COMPLEX_FLOAT,
 185
 186   BUILT_IN_COMPLEX_DIV_MIN,
 187   BUILT_IN_COMPLEX_DIV_MAX
 188     = BUILT_IN_COMPLEX_DIV_MIN
 189       + MAX_MODE_COMPLEX_FLOAT
 190       - MIN_MODE_COMPLEX_FLOAT,
 191
 192   /* Upper bound on non-language-specific builtins.  */
 193   END_BUILTINS
 194 };
 195
 196 /* Internal functions.  */
 197 enum internal_fn {
 198 #define DEF_INTERNAL_FN(CODE, FLAGS, FNSPEC) IFN_##CODE,
 199 #include "internal-fn.def"
 200   IFN_LAST
 201 };
 202
 203 /* An enum that combines target-independent built-in functions with
 204    internal functions, so that they can be treated in a similar way.
 205    The numbers for built-in functions are the same as for the
 206    built_in_function enum.  The numbers for internal functions
 207    start at END_BUITLINS.  */
 208 enum combined_fn {
 209 #define DEF_BUILTIN(ENUM, N, C, T, LT, B, F, NA, AT, IM, COND) \
 210   CFN_##ENUM = int (ENUM),
 211 #include "builtins.def"
 212
 213
 214 #define DEF_INTERNAL_FN(CODE, FLAGS, FNSPEC) \
 215   CFN_##CODE = int (END_BUILTINS) + int (IFN_##CODE),
 216 #include "internal-fn.def"
 217
 218   CFN_LAST
 219 };
 220
 221 /* Tree code classes.  Each tree_code has an associated code class
 222    represented by a TREE_CODE_CLASS.  */
 223 enum tree_code_class {
 224   tcc_exceptional, /* An exceptional code (fits no category).  */
 225   tcc_constant,    /* A constant.  */
 226   /* Order of tcc_type and tcc_declaration is important.  */
 227   tcc_type,        /* A type object code.  */
 228   tcc_declaration, /* A declaration (also serving as variable refs).  */
 229   tcc_reference,   /* A reference to storage.  */
 230   tcc_comparison,  /* A comparison expression.  */
 231   tcc_unary,       /* A unary arithmetic expression.  */
 232   tcc_binary,      /* A binary arithmetic expression.  */
 233   tcc_statement,   /* A statement expression, which have side effects
 234                       but usually no interesting value.  */
 235   tcc_vl_exp,      /* A function call or other expression with a
 236                       variable-length operand vector.  */
 237   tcc_expression   /* Any other expression.  */
 238 };
 239
 240 /* OMP_CLAUSE codes.  Do not reorder, as this is used to index into
 241    the tables omp_clause_num_ops and omp_clause_code_name.  */
 242 enum omp_clause_code {
 243   /* Clause zero is special-cased inside the parser
 244      (c_parser_omp_variable_list).  */
 245   OMP_CLAUSE_ERROR = 0,
 246
 247   /* OpenACC/OpenMP clause: private (variable_list).  */
 248   OMP_CLAUSE_PRIVATE,
 249
 250   /* OpenMP clause: shared (variable_list).  */
 251   OMP_CLAUSE_SHARED,
 252
 253   /* OpenACC/OpenMP clause: firstprivate (variable_list).  */
 254   OMP_CLAUSE_FIRSTPRIVATE,
 255
 256   /* OpenMP clause: lastprivate (variable_list).  */
 257   OMP_CLAUSE_LASTPRIVATE,
 258
 259   /* OpenACC/OpenMP clause: reduction (operator:variable_list).
 260      OMP_CLAUSE_REDUCTION_CODE: The tree_code of the operator.
 261      Operand 1: OMP_CLAUSE_REDUCTION_INIT: Stmt-list to initialize the var.
 262      Operand 2: OMP_CLAUSE_REDUCTION_MERGE: Stmt-list to merge private var
 263                 into the shared one.
 264      Operand 3: OMP_CLAUSE_REDUCTION_PLACEHOLDER: A dummy VAR_DECL
 265                 placeholder used in OMP_CLAUSE_REDUCTION_{INIT,MERGE}.
 266      Operand 4: OMP_CLAUSE_REDUCTION_DECL_PLACEHOLDER: Another dummy
 267                 VAR_DECL placeholder, used like the above for C/C++ array
 268                 reductions.  */
 269   OMP_CLAUSE_REDUCTION,
 270
 271   /* OpenMP clause: task_reduction (operator:variable_list).  */
 272   OMP_CLAUSE_TASK_REDUCTION,
 273
 274   /* OpenMP clause: in_reduction (operator:variable_list).  */
 275   OMP_CLAUSE_IN_REDUCTION,
 276
 277   /* OpenMP clause: copyin (variable_list).  */
 278   OMP_CLAUSE_COPYIN,
 279
 280   /* OpenMP clause: copyprivate (variable_list).  */
 281   OMP_CLAUSE_COPYPRIVATE,
 282
 283   /* OpenMP clause: linear (variable-list[:linear-step]).  */
 284   OMP_CLAUSE_LINEAR,
 285
 286   /* OpenMP clause: affinity([depend-modifier :] variable-list).  */
 287   OMP_CLAUSE_AFFINITY,
 288
 289   /* OpenMP clause: aligned (variable-list[:alignment]).  */
 290   OMP_CLAUSE_ALIGNED,
 291
 292   /* OpenMP clause: allocate ([allocator:]variable-list).  */
 293   OMP_CLAUSE_ALLOCATE,
 294
 295   /* OpenMP clause: depend ({in,out,inout}:variable-list).  */
 296   OMP_CLAUSE_DEPEND,
 297
 298   /* OpenMP clause: nontemporal (variable-list).  */
 299   OMP_CLAUSE_NONTEMPORAL,
 300
 301   /* OpenMP clause: uniform (argument-list).  */
 302   OMP_CLAUSE_UNIFORM,
 303
 304   /* OpenMP clause: enter (extended-list).
 305      to is a deprecated alias when it appears in declare target.  */
 306   OMP_CLAUSE_ENTER,
 307
 308   /* OpenMP clause: link (variable-list).  */
 309   OMP_CLAUSE_LINK,
 310
 311   /* OpenMP clause: detach (event-handle).  */
 312   OMP_CLAUSE_DETACH,
 313
 314   /* OpenACC clause: use_device (variable-list).
 315      OpenMP clause: use_device_ptr (ptr-list).  */
 316   OMP_CLAUSE_USE_DEVICE_PTR,
 317
 318   /* OpenMP clause: use_device_addr (variable-list).  */
 319   OMP_CLAUSE_USE_DEVICE_ADDR,
 320
 321   /* OpenMP clause: is_device_ptr (variable-list).  */
 322   OMP_CLAUSE_IS_DEVICE_PTR,
 323
 324   /* OpenMP clause: inclusive (variable-list).  */
 325   OMP_CLAUSE_INCLUSIVE,
 326
 327   /* OpenMP clause: exclusive (variable-list).  */
 328   OMP_CLAUSE_EXCLUSIVE,
 329
 330   /* OpenMP clause: from (variable-list).  */
 331   OMP_CLAUSE_FROM,
 332
 333   /* OpenMP clause: to (variable-list).  */
 334   OMP_CLAUSE_TO,
 335
 336   /* OpenACC clauses: {copy, copyin, copyout, create, delete, deviceptr,
 337      device, host (self), present, present_or_copy (pcopy), present_or_copyin
 338      (pcopyin), present_or_copyout (pcopyout), present_or_create (pcreate)}
 339      (variable-list).
 340
 341      OpenMP clause: map ({alloc:,to:,from:,tofrom:,}variable-list).  */
 342   OMP_CLAUSE_MAP,
 343
 344   /* OpenMP clause: has_device_addr (variable-list).  */
 345   OMP_CLAUSE_HAS_DEVICE_ADDR,
 346
 347   /* OpenMP clause: doacross ({source,sink}:vec).  */
 348   OMP_CLAUSE_DOACROSS,
 349
 350   /* Internal structure to hold OpenACC cache directive's variable-list.
 351      #pragma acc cache (variable-list).  */
 352   OMP_CLAUSE__CACHE_,
 353
 354   /* OpenACC clause: gang [(gang-argument-list)].
 355      Where
 356       gang-argument-list: [gang-argument-list, ] gang-argument
 357       gang-argument: [num:] integer-expression
 358                    | static: size-expression
 359       size-expression: * | integer-expression.  */
 360   OMP_CLAUSE_GANG,
 361
 362   /* OpenACC clause: async [(integer-expression)].  */
 363   OMP_CLAUSE_ASYNC,
 364
 365   /* OpenACC clause: wait [(integer-expression-list)].  */
 366   OMP_CLAUSE_WAIT,
 367
 368   /* OpenACC clause: auto.  */
 369   OMP_CLAUSE_AUTO,
 370
 371   /* OpenACC clause: seq.  */
 372   OMP_CLAUSE_SEQ,
 373
 374   /* Internal clause: temporary for combined loops expansion.  */
 375   OMP_CLAUSE__LOOPTEMP_,
 376
 377   /* Internal clause: temporary for task reductions.  */
 378   OMP_CLAUSE__REDUCTEMP_,
 379
 380   /* Internal clause: temporary for lastprivate(conditional:).  */
 381   OMP_CLAUSE__CONDTEMP_,
 382
 383   /* Internal clause: temporary for inscan reductions.  */
 384   OMP_CLAUSE__SCANTEMP_,
 385
 386   /* OpenACC/OpenMP clause: if (scalar-expression).  */
 387   OMP_CLAUSE_IF,
 388
 389   /* OpenMP clause: num_threads (integer-expression).  */
 390   OMP_CLAUSE_NUM_THREADS,
 391
 392   /* OpenMP clause: schedule.  */
 393   OMP_CLAUSE_SCHEDULE,
 394
 395   /* OpenMP clause: nowait.  */
 396   OMP_CLAUSE_NOWAIT,
 397
 398   /* OpenMP clause: ordered [(constant-integer-expression)].  */
 399   OMP_CLAUSE_ORDERED,
 400
 401   /* OpenACC/OpenMP clause: default.  */
 402   OMP_CLAUSE_DEFAULT,
 403
 404   /* OpenACC/OpenMP clause: collapse (constant-integer-expression).  */
 405   OMP_CLAUSE_COLLAPSE,
 406
 407   /* OpenMP clause: untied.  */
 408   OMP_CLAUSE_UNTIED,
 409
 410   /* OpenMP clause: final (scalar-expression).  */
 411   OMP_CLAUSE_FINAL,
 412
 413   /* OpenMP clause: mergeable.  */
 414   OMP_CLAUSE_MERGEABLE,
 415
 416   /* OpenMP clause: device (integer-expression).  */
 417   OMP_CLAUSE_DEVICE,
 418
 419   /* OpenMP clause: dist_schedule (static[:chunk-size]).  */
 420   OMP_CLAUSE_DIST_SCHEDULE,
 421
 422   /* OpenMP clause: inbranch.  */
 423   OMP_CLAUSE_INBRANCH,
 424
 425   /* OpenMP clause: notinbranch.  */
 426   OMP_CLAUSE_NOTINBRANCH,
 427
 428   /* OpenMP clause: num_teams(integer-expression).  */
 429   OMP_CLAUSE_NUM_TEAMS,
 430
 431   /* OpenMP clause: thread_limit(integer-expression).  */
 432   OMP_CLAUSE_THREAD_LIMIT,
 433
 434   /* OpenMP clause: proc_bind ({master,close,spread}).  */
 435   OMP_CLAUSE_PROC_BIND,
 436
 437   /* OpenMP clause: safelen (constant-integer-expression).  */
 438   OMP_CLAUSE_SAFELEN,
 439
 440   /* OpenMP clause: simdlen (constant-integer-expression).  */
 441   OMP_CLAUSE_SIMDLEN,
 442
 443   /* OpenMP clause: device_type ({host,nohost,any}).  */
 444   OMP_CLAUSE_DEVICE_TYPE,
 445
 446   /* OpenMP clause: for.  */
 447   OMP_CLAUSE_FOR,
 448
 449   /* OpenMP clause: parallel.  */
 450   OMP_CLAUSE_PARALLEL,
 451
 452   /* OpenMP clause: sections.  */
 453   OMP_CLAUSE_SECTIONS,
 454
 455   /* OpenMP clause: taskgroup.  */
 456   OMP_CLAUSE_TASKGROUP,
 457
 458   /* OpenMP clause: priority (integer-expression).  */
 459   OMP_CLAUSE_PRIORITY,
 460
 461   /* OpenMP clause: grainsize (integer-expression).  */
 462   OMP_CLAUSE_GRAINSIZE,
 463
 464   /* OpenMP clause: num_tasks (integer-expression).  */
 465   OMP_CLAUSE_NUM_TASKS,
 466
 467   /* OpenMP clause: nogroup.  */
 468   OMP_CLAUSE_NOGROUP,
 469
 470   /* OpenMP clause: threads.  */
 471   OMP_CLAUSE_THREADS,
 472
 473   /* OpenMP clause: simd.  */
 474   OMP_CLAUSE_SIMD,
 475
 476   /* OpenMP clause: hint (integer-expression).  */
 477   OMP_CLAUSE_HINT,
 478
 479   /* OpenMP clause: defaultmap (tofrom: scalar).  */
 480   OMP_CLAUSE_DEFAULTMAP,
 481
 482   /* OpenMP clause: order (concurrent).  */
 483   OMP_CLAUSE_ORDER,
 484
 485   /* OpenMP clause: bind (binding).  */
 486   OMP_CLAUSE_BIND,
 487
 488   /* OpenMP clause: filter (integer-expression).  */
 489   OMP_CLAUSE_FILTER,
 490
 491   /* Internally used only clause, holding SIMD uid.  */
 492   OMP_CLAUSE__SIMDUID_,
 493
 494   /* Internally used only clause, flag whether this is SIMT simd
 495      loop or not.  */
 496   OMP_CLAUSE__SIMT_,
 497
 498   /* OpenACC clause: independent.  */
 499   OMP_CLAUSE_INDEPENDENT,
 500
 501   /* OpenACC clause: worker [( [num:] integer-expression)].  */
 502   OMP_CLAUSE_WORKER,
 503
 504   /* OpenACC clause: vector [( [length:] integer-expression)].  */
 505   OMP_CLAUSE_VECTOR,
 506
 507   /* OpenACC clause: num_gangs (integer-expression).  */
 508   OMP_CLAUSE_NUM_GANGS,
 509
 510   /* OpenACC clause: num_workers (integer-expression).  */
 511   OMP_CLAUSE_NUM_WORKERS,
 512
 513   /* OpenACC clause: vector_length (integer-expression).  */
 514   OMP_CLAUSE_VECTOR_LENGTH,
 515
 516   /* OpenACC clause: tile ( size-expr-list ).  */
 517   OMP_CLAUSE_TILE,
 518
 519   /* OpenACC clause: if_present.  */
 520   OMP_CLAUSE_IF_PRESENT,
 521
 522   /* OpenACC clause: finalize.  */
 523   OMP_CLAUSE_FINALIZE,
 524
 525   /* OpenACC clause: nohost.  */
 526   OMP_CLAUSE_NOHOST,
 527 };
 528
 529 #undef DEFTREESTRUCT
 530 #define DEFTREESTRUCT(ENUM, NAME) ENUM,
 531 enum tree_node_structure_enum {
 532 #include "treestruct.def"
 533   LAST_TS_ENUM
 534 };
 535 #undef DEFTREESTRUCT
 536
 537 enum omp_clause_schedule_kind {
 538   OMP_CLAUSE_SCHEDULE_STATIC,
 539   OMP_CLAUSE_SCHEDULE_DYNAMIC,
 540   OMP_CLAUSE_SCHEDULE_GUIDED,
 541   OMP_CLAUSE_SCHEDULE_AUTO,
 542   OMP_CLAUSE_SCHEDULE_RUNTIME,
 543   OMP_CLAUSE_SCHEDULE_MASK = (1 << 3) - 1,
 544   OMP_CLAUSE_SCHEDULE_MONOTONIC = (1 << 3),
 545   OMP_CLAUSE_SCHEDULE_NONMONOTONIC = (1 << 4),
 546   OMP_CLAUSE_SCHEDULE_LAST = 2 * OMP_CLAUSE_SCHEDULE_NONMONOTONIC - 1
 547 };
 548
 549 enum omp_clause_default_kind {
 550   OMP_CLAUSE_DEFAULT_UNSPECIFIED,
 551   OMP_CLAUSE_DEFAULT_SHARED,
 552   OMP_CLAUSE_DEFAULT_NONE,
 553   OMP_CLAUSE_DEFAULT_PRIVATE,
 554   OMP_CLAUSE_DEFAULT_FIRSTPRIVATE,
 555   OMP_CLAUSE_DEFAULT_PRESENT,
 556   OMP_CLAUSE_DEFAULT_LAST
 557 };
 558
 559 enum omp_clause_defaultmap_kind {
 560   OMP_CLAUSE_DEFAULTMAP_CATEGORY_UNSPECIFIED,
 561   OMP_CLAUSE_DEFAULTMAP_CATEGORY_SCALAR,
 562   OMP_CLAUSE_DEFAULTMAP_CATEGORY_AGGREGATE,
 563   OMP_CLAUSE_DEFAULTMAP_CATEGORY_ALLOCATABLE,
 564   OMP_CLAUSE_DEFAULTMAP_CATEGORY_POINTER,
 565   OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK = 7,
 566   OMP_CLAUSE_DEFAULTMAP_ALLOC = 1 * (OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK + 1),
 567   OMP_CLAUSE_DEFAULTMAP_TO = 2 * (OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK + 1),
 568   OMP_CLAUSE_DEFAULTMAP_FROM = 3 * (OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK + 1),
 569   OMP_CLAUSE_DEFAULTMAP_TOFROM = 4 * (OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK + 1),
 570   OMP_CLAUSE_DEFAULTMAP_FIRSTPRIVATE
 571     = 5 * (OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK + 1),
 572   OMP_CLAUSE_DEFAULTMAP_NONE = 6 * (OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK + 1),
 573   OMP_CLAUSE_DEFAULTMAP_DEFAULT
 574     = 7 * (OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK + 1),
 575   OMP_CLAUSE_DEFAULTMAP_PRESENT = 8 * (OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK + 1),
 576   OMP_CLAUSE_DEFAULTMAP_MASK = 15 * (OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK + 1)
 577 };
 578
 579 enum omp_clause_bind_kind {
 580   OMP_CLAUSE_BIND_TEAMS,
 581   OMP_CLAUSE_BIND_PARALLEL,
 582   OMP_CLAUSE_BIND_THREAD
 583 };
 584
 585 /* memory-order-clause on OpenMP atomic/flush constructs or
 586    argument of atomic_default_mem_order clause.  */
 587 enum omp_memory_order {
 588   OMP_MEMORY_ORDER_UNSPECIFIED,
 589   OMP_MEMORY_ORDER_RELAXED,
 590   OMP_MEMORY_ORDER_ACQUIRE,
 591   OMP_MEMORY_ORDER_RELEASE,
 592   OMP_MEMORY_ORDER_ACQ_REL,
 593   OMP_MEMORY_ORDER_SEQ_CST,
 594   OMP_MEMORY_ORDER_MASK = 7,
 595   OMP_FAIL_MEMORY_ORDER_UNSPECIFIED = OMP_MEMORY_ORDER_UNSPECIFIED * 8,
 596   OMP_FAIL_MEMORY_ORDER_RELAXED = OMP_MEMORY_ORDER_RELAXED * 8,
 597   OMP_FAIL_MEMORY_ORDER_ACQUIRE = OMP_MEMORY_ORDER_ACQUIRE * 8,
 598   OMP_FAIL_MEMORY_ORDER_RELEASE = OMP_MEMORY_ORDER_RELEASE * 8,
 599   OMP_FAIL_MEMORY_ORDER_ACQ_REL = OMP_MEMORY_ORDER_ACQ_REL * 8,
 600   OMP_FAIL_MEMORY_ORDER_SEQ_CST = OMP_MEMORY_ORDER_SEQ_CST * 8,
 601   OMP_FAIL_MEMORY_ORDER_MASK = OMP_MEMORY_ORDER_MASK * 8
 602 };
 603 #define OMP_FAIL_MEMORY_ORDER_SHIFT 3
 604
 605 /* There is a TYPE_QUAL value for each type qualifier.  They can be
 606    combined by bitwise-or to form the complete set of qualifiers for a
 607    type.  */
 608 enum cv_qualifier {
 609   TYPE_UNQUALIFIED   = 0x0,
 610   TYPE_QUAL_CONST    = 0x1,
 611   TYPE_QUAL_VOLATILE = 0x2,
 612   TYPE_QUAL_RESTRICT = 0x4,
 613   TYPE_QUAL_ATOMIC   = 0x8
 614 };
 615
 616 /* Standard named or nameless data types of the C compiler.  */
 617 enum tree_index {
 618   TI_ERROR_MARK,
 619   TI_INTQI_TYPE,
 620   TI_INTHI_TYPE,
 621   TI_INTSI_TYPE,
 622   TI_INTDI_TYPE,
 623   TI_INTTI_TYPE,
 624
 625   TI_UINTQI_TYPE,
 626   TI_UINTHI_TYPE,
 627   TI_UINTSI_TYPE,
 628   TI_UINTDI_TYPE,
 629   TI_UINTTI_TYPE,
 630
 631   TI_ATOMICQI_TYPE,
 632   TI_ATOMICHI_TYPE,
 633   TI_ATOMICSI_TYPE,
 634   TI_ATOMICDI_TYPE,
 635   TI_ATOMICTI_TYPE,
 636
 637   TI_UINT16_TYPE,
 638   TI_UINT32_TYPE,
 639   TI_UINT64_TYPE,
 640   TI_UINT128_TYPE,
 641
 642   TI_VOID,
 643
 644   TI_INTEGER_ZERO,
 645   TI_INTEGER_ONE,
 646   TI_INTEGER_THREE,
 647   TI_INTEGER_MINUS_ONE,
 648   TI_NULL_POINTER,
 649
 650   TI_SIZE_ZERO,
 651   TI_SIZE_ONE,
 652
 653   TI_BITSIZE_ZERO,
 654   TI_BITSIZE_ONE,
 655   TI_BITSIZE_UNIT,
 656
 657   TI_PUBLIC,
 658   TI_PROTECTED,
 659   TI_PRIVATE,
 660
 661   TI_BOOLEAN_FALSE,
 662   TI_BOOLEAN_TRUE,
 663
 664   TI_FLOAT_TYPE,
 665   TI_DOUBLE_TYPE,
 666   TI_LONG_DOUBLE_TYPE,
 667
 668   /* __bf16 type if supported (used in C++ as std::bfloat16_t).  */
 669   TI_BFLOAT16_TYPE,
 670
 671   /* The _FloatN and _FloatNx types must be consecutive, and in the
 672      same sequence as the corresponding complex types, which must also
 673      be consecutive; _FloatN must come before _FloatNx; the order must
 674      also be the same as in the floatn_nx_types array and the RID_*
 675      values in c-common.h.  This is so that iterations over these
 676      types work as intended.  */
 677   TI_FLOAT16_TYPE,
 678   TI_FLOATN_TYPE_FIRST = TI_FLOAT16_TYPE,
 679   TI_FLOATN_NX_TYPE_FIRST = TI_FLOAT16_TYPE,
 680   TI_FLOAT32_TYPE,
 681   TI_FLOAT64_TYPE,
 682   TI_FLOAT128_TYPE,
 683   TI_FLOATN_TYPE_LAST = TI_FLOAT128_TYPE,
 684 #define NUM_FLOATN_TYPES (TI_FLOATN_TYPE_LAST - TI_FLOATN_TYPE_FIRST + 1)
 685   TI_FLOAT32X_TYPE,
 686   TI_FLOATNX_TYPE_FIRST = TI_FLOAT32X_TYPE,
 687   TI_FLOAT64X_TYPE,
 688   TI_FLOAT128X_TYPE,
 689   TI_FLOATNX_TYPE_LAST = TI_FLOAT128X_TYPE,
 690   TI_FLOATN_NX_TYPE_LAST = TI_FLOAT128X_TYPE,
 691 #define NUM_FLOATNX_TYPES (TI_FLOATNX_TYPE_LAST - TI_FLOATNX_TYPE_FIRST + 1)
 692 #define NUM_FLOATN_NX_TYPES (TI_FLOATN_NX_TYPE_LAST             \
 693                              - TI_FLOATN_NX_TYPE_FIRST          \
 694                              + 1)
 695
 696   /* Type used by certain backends for __float128, which in C++ should be
 697      distinct type from _Float128 for backwards compatibility reasons.  */
 698   TI_FLOAT128T_TYPE,
 699
 700   /* Put the complex types after their component types, so that in (sequential)
 701      tree streaming we can assert that their component types have already been
 702      handled (see tree-streamer.cc:record_common_node).  */
 703   TI_COMPLEX_INTEGER_TYPE,
 704   TI_COMPLEX_FLOAT_TYPE,
 705   TI_COMPLEX_DOUBLE_TYPE,
 706   TI_COMPLEX_LONG_DOUBLE_TYPE,
 707
 708   TI_COMPLEX_FLOAT16_TYPE,
 709   TI_COMPLEX_FLOATN_NX_TYPE_FIRST = TI_COMPLEX_FLOAT16_TYPE,
 710   TI_COMPLEX_FLOAT32_TYPE,
 711   TI_COMPLEX_FLOAT64_TYPE,
 712   TI_COMPLEX_FLOAT128_TYPE,
 713   TI_COMPLEX_FLOAT32X_TYPE,
 714   TI_COMPLEX_FLOAT64X_TYPE,
 715   TI_COMPLEX_FLOAT128X_TYPE,
 716
 717   TI_FLOAT_PTR_TYPE,
 718   TI_DOUBLE_PTR_TYPE,
 719   TI_LONG_DOUBLE_PTR_TYPE,
 720   TI_INTEGER_PTR_TYPE,
 721
 722   TI_VOID_TYPE,
 723   TI_PTR_TYPE,
 724   TI_CONST_PTR_TYPE,
 725   TI_SIZE_TYPE,
 726   TI_PID_TYPE,
 727   TI_PTRDIFF_TYPE,
 728   TI_VA_LIST_TYPE,
 729   TI_VA_LIST_GPR_COUNTER_FIELD,
 730   TI_VA_LIST_FPR_COUNTER_FIELD,
 731   TI_BOOLEAN_TYPE,
 732   TI_FILEPTR_TYPE,
 733   TI_CONST_TM_PTR_TYPE,
 734   TI_FENV_T_PTR_TYPE,
 735   TI_CONST_FENV_T_PTR_TYPE,
 736   TI_FEXCEPT_T_PTR_TYPE,
 737   TI_CONST_FEXCEPT_T_PTR_TYPE,
 738   TI_POINTER_SIZED_TYPE,
 739
 740   TI_DFLOAT32_TYPE,
 741   TI_DFLOAT64_TYPE,
 742   TI_DFLOAT128_TYPE,
 743
 744   TI_VOID_LIST_NODE,
 745
 746   TI_MAIN_IDENTIFIER,
 747
 748   TI_SAT_SFRACT_TYPE,
 749   TI_SAT_FRACT_TYPE,
 750   TI_SAT_LFRACT_TYPE,
 751   TI_SAT_LLFRACT_TYPE,
 752   TI_SAT_USFRACT_TYPE,
 753   TI_SAT_UFRACT_TYPE,
 754   TI_SAT_ULFRACT_TYPE,
 755   TI_SAT_ULLFRACT_TYPE,
 756   TI_SFRACT_TYPE,
 757   TI_FRACT_TYPE,
 758   TI_LFRACT_TYPE,
 759   TI_LLFRACT_TYPE,
 760   TI_USFRACT_TYPE,
 761   TI_UFRACT_TYPE,
 762   TI_ULFRACT_TYPE,
 763   TI_ULLFRACT_TYPE,
 764   TI_SAT_SACCUM_TYPE,
 765   TI_SAT_ACCUM_TYPE,
 766   TI_SAT_LACCUM_TYPE,
 767   TI_SAT_LLACCUM_TYPE,
 768   TI_SAT_USACCUM_TYPE,
 769   TI_SAT_UACCUM_TYPE,
 770   TI_SAT_ULACCUM_TYPE,
 771   TI_SAT_ULLACCUM_TYPE,
 772   TI_SACCUM_TYPE,
 773   TI_ACCUM_TYPE,
 774   TI_LACCUM_TYPE,
 775   TI_LLACCUM_TYPE,
 776   TI_USACCUM_TYPE,
 777   TI_UACCUM_TYPE,
 778   TI_ULACCUM_TYPE,
 779   TI_ULLACCUM_TYPE,
 780   TI_QQ_TYPE,
 781   TI_HQ_TYPE,
 782   TI_SQ_TYPE,
 783   TI_DQ_TYPE,
 784   TI_TQ_TYPE,
 785   TI_UQQ_TYPE,
 786   TI_UHQ_TYPE,
 787   TI_USQ_TYPE,
 788   TI_UDQ_TYPE,
 789   TI_UTQ_TYPE,
 790   TI_SAT_QQ_TYPE,
 791   TI_SAT_HQ_TYPE,
 792   TI_SAT_SQ_TYPE,
 793   TI_SAT_DQ_TYPE,
 794   TI_SAT_TQ_TYPE,
 795   TI_SAT_UQQ_TYPE,
 796   TI_SAT_UHQ_TYPE,
 797   TI_SAT_USQ_TYPE,
 798   TI_SAT_UDQ_TYPE,
 799   TI_SAT_UTQ_TYPE,
 800   TI_HA_TYPE,
 801   TI_SA_TYPE,
 802   TI_DA_TYPE,
 803   TI_TA_TYPE,
 804   TI_UHA_TYPE,
 805   TI_USA_TYPE,
 806   TI_UDA_TYPE,
 807   TI_UTA_TYPE,
 808   TI_SAT_HA_TYPE,
 809   TI_SAT_SA_TYPE,
 810   TI_SAT_DA_TYPE,
 811   TI_SAT_TA_TYPE,
 812   TI_SAT_UHA_TYPE,
 813   TI_SAT_USA_TYPE,
 814   TI_SAT_UDA_TYPE,
 815   TI_SAT_UTA_TYPE,
 816
 817   TI_MODULE_HWM,
 818   /* Nodes below here change during compilation, and should therefore
 819      not be in the C++ module's global tree table.  */
 820
 821   TI_OPTIMIZATION_DEFAULT,
 822   TI_OPTIMIZATION_CURRENT,
 823   TI_TARGET_OPTION_DEFAULT,
 824   TI_TARGET_OPTION_CURRENT,
 825   TI_CURRENT_TARGET_PRAGMA,
 826   TI_CURRENT_OPTIMIZE_PRAGMA,
 827
 828   TI_CHREC_DONT_KNOW,
 829   TI_CHREC_KNOWN,
 830
 831   TI_MAX
 832 };
 833
 834 /* An enumeration of the standard C integer types.  These must be
 835    ordered so that shorter types appear before longer ones, and so
 836    that signed types appear before unsigned ones, for the correct
 837    functioning of interpret_integer() in c-lex.cc.  */
 838 enum integer_type_kind {
 839   itk_char,
 840   itk_signed_char,
 841   itk_unsigned_char,
 842   itk_short,
 843   itk_unsigned_short,
 844   itk_int,
 845   itk_unsigned_int,
 846   itk_long,
 847   itk_unsigned_long,
 848   itk_long_long,
 849   itk_unsigned_long_long,
 850
 851   itk_intN_0,
 852   itk_unsigned_intN_0,
 853   itk_intN_1,
 854   itk_unsigned_intN_1,
 855   itk_intN_2,
 856   itk_unsigned_intN_2,
 857   itk_intN_3,
 858   itk_unsigned_intN_3,
 859
 860   itk_none
 861 };
 862
 863 /* A pointer-to-function member type looks like:
 864
 865      struct {
 866        __P __pfn;
 867        ptrdiff_t __delta;
 868      };
 869
 870    If __pfn is NULL, it is a NULL pointer-to-member-function.
 871
 872    (Because the vtable is always the first thing in the object, we
 873    don't need its offset.)  If the function is virtual, then PFN is
 874    one plus twice the index into the vtable; otherwise, it is just a
 875    pointer to the function.
 876
 877    Unfortunately, using the lowest bit of PFN doesn't work in
 878    architectures that don't impose alignment requirements on function
 879    addresses, or that use the lowest bit to tell one ISA from another,
 880    for example.  For such architectures, we use the lowest bit of
 881    DELTA instead of the lowest bit of the PFN, and DELTA will be
 882    multiplied by 2.  */
 883 enum ptrmemfunc_vbit_where_t {
 884   ptrmemfunc_vbit_in_pfn,
 885   ptrmemfunc_vbit_in_delta
 886 };
 887
 888 /* Flags that may be passed in the third argument of decl_attributes, and
 889    to handler functions for attributes.  */
 890 enum attribute_flags {
 891   /* The type passed in is the type of a DECL, and any attributes that
 892      should be passed in again to be applied to the DECL rather than the
 893      type should be returned.  */
 894   ATTR_FLAG_DECL_NEXT = 1,
 895   /* The type passed in is a function return type, and any attributes that
 896      should be passed in again to be applied to the function type rather
 897      than the return type should be returned.  */
 898   ATTR_FLAG_FUNCTION_NEXT = 2,
 899   /* The type passed in is an array element type, and any attributes that
 900      should be passed in again to be applied to the array type rather
 901      than the element type should be returned.  */
 902   ATTR_FLAG_ARRAY_NEXT = 4,
 903   /* The type passed in is a structure, union or enumeration type being
 904      created, and should be modified in place.  */
 905   ATTR_FLAG_TYPE_IN_PLACE = 8,
 906   /* The attributes are being applied by default to a library function whose
 907      name indicates known behavior, and should be silently ignored if they
 908      are not in fact compatible with the function type.  */
 909   ATTR_FLAG_BUILT_IN = 16,
 910   /* A given attribute has been parsed as a C++-11 attribute.  */
 911   ATTR_FLAG_CXX11 = 32,
 912   /* The attribute handler is being invoked with an internal argument
 913      that may not otherwise be valid when specified in source code.  */
 914   ATTR_FLAG_INTERNAL = 64
 915 };
 916
 917 /* Types used to represent sizes.  */
 918 enum size_type_kind {
 919   stk_sizetype,         /* Normal representation of sizes in bytes.  */
 920   stk_ssizetype,        /* Signed representation of sizes in bytes.  */
 921   stk_bitsizetype,      /* Normal representation of sizes in bits.  */
 922   stk_sbitsizetype,     /* Signed representation of sizes in bits.  */
 923   stk_type_kind_last
 924 };
 925
 926 /* Flags controlling operand_equal_p() behavior.  */
 927 enum operand_equal_flag {
 928   OEP_ONLY_CONST = 1,
 929   OEP_PURE_SAME = 2,
 930   OEP_MATCH_SIDE_EFFECTS = 4,
 931   OEP_ADDRESS_OF = 8,
 932   /* Internal within operand_equal_p:  */
 933   OEP_NO_HASH_CHECK = 16,
 934   /* Internal within inchash::add_expr:  */
 935   OEP_HASH_CHECK = 32,
 936   /* Makes operand_equal_p handle more expressions:  */
 937   OEP_LEXICOGRAPHIC = 64,
 938   OEP_BITWISE = 128,
 939   /* For OEP_ADDRESS_OF of COMPONENT_REFs, only consider same fields as
 940      equivalent rather than also different fields with the same offset.  */
 941   OEP_ADDRESS_OF_SAME_FIELD = 256,
 942   /* In conjunction with OEP_LEXICOGRAPHIC considers names of declarations
 943      of the same kind.  Used to compare VLA bounds involving parameters
 944      across redeclarations of the same function.  */
 945   OEP_DECL_NAME = 512
 946 };
 947
 948 /* Enum and arrays used for tree allocation stats.
 949    Keep in sync with tree.cc:tree_node_kind_names.  */
 950 enum tree_node_kind {
 951   d_kind,
 952   t_kind,
 953   b_kind,
 954   s_kind,
 955   r_kind,
 956   e_kind,
 957   c_kind,
 958   id_kind,
 959   vec_kind,
 960   binfo_kind,
 961   ssa_name_kind,
 962   constr_kind,
 963   x_kind,
 964   lang_decl,
 965   lang_type,
 966   omp_clause_kind,
 967   all_kinds
 968 };
 969
 970 enum annot_expr_kind {
 971   annot_expr_ivdep_kind,
 972   annot_expr_unroll_kind,
 973   annot_expr_no_vector_kind,
 974   annot_expr_vector_kind,
 975   annot_expr_parallel_kind,
 976   annot_expr_kind_last
 977 };
 978
 979 /* The kind of a TREE_CLOBBER_P CONSTRUCTOR node.  */
 980 enum clobber_kind {
 981   /* Unspecified, this clobber acts as a store of an undefined value.  */
 982   CLOBBER_UNDEF,
 983   /* This clobber ends the lifetime of the storage.  */
 984   CLOBBER_EOL,
 985   CLOBBER_LAST
 986 };
 987
 988 /*---------------------------------------------------------------------------
 989                                 Type definitions
 990 ---------------------------------------------------------------------------*/
 991 /* When processing aliases at the symbol table level, we need the
 992    declaration of target. For this reason we need to queue aliases and
 993    process them after all declarations has been produced.  */
 994 struct GTY(()) alias_pair {
 995   tree decl;
 996   tree target;
 997 };
 998
 999 /* An initialization priority.  */
1000 typedef unsigned short priority_type;
1001
1002 /* The type of a callback function for walking over tree structure.  */
1003 typedef tree (*walk_tree_fn) (tree *, int *, void *);
1004
1005 /* The type of a callback function that represents a custom walk_tree.  */
1006 typedef tree (*walk_tree_lh) (tree *, int *, tree (*) (tree *, int *, void *),
1007                               void *, hash_set<tree> *);
1008
1009
1010 /*---------------------------------------------------------------------------
1011                               Main data structures
1012 ---------------------------------------------------------------------------*/
1013 /* A tree node can represent a data type, a variable, an expression
1014    or a statement.  Each node has a TREE_CODE which says what kind of
1015    thing it represents.  Some common codes are:
1016    INTEGER_TYPE -- represents a type of integers.
1017    ARRAY_TYPE -- represents a type of pointer.
1018    VAR_DECL -- represents a declared variable.
1019    INTEGER_CST -- represents a constant integer value.
1020    PLUS_EXPR -- represents a sum (an expression).
1021
1022    As for the contents of a tree node: there are some fields
1023    that all nodes share.  Each TREE_CODE has various special-purpose
1024    fields as well.  The fields of a node are never accessed directly,
1025    always through accessor macros.  */
1026
1027 /* Every kind of tree node starts with this structure,
1028    so all nodes have these fields.
1029
1030    See the accessor macros, defined below, for documentation of the
1031    fields, and the table below which connects the fields and the
1032    accessor macros.  */
1033
1034 struct GTY(()) tree_base {
1035   ENUM_BITFIELD(tree_code) code : 16;
1036
1037   unsigned side_effects_flag : 1;
1038   unsigned constant_flag : 1;
1039   unsigned addressable_flag : 1;
1040   unsigned volatile_flag : 1;
1041   unsigned readonly_flag : 1;
1042   unsigned asm_written_flag: 1;
1043   unsigned nowarning_flag : 1;
1044   unsigned visited : 1;
1045
1046   unsigned used_flag : 1;
1047   unsigned nothrow_flag : 1;
1048   unsigned static_flag : 1;
1049   unsigned public_flag : 1;
1050   unsigned private_flag : 1;
1051   unsigned protected_flag : 1;
1052   unsigned deprecated_flag : 1;
1053   unsigned default_def_flag : 1;
1054
1055   union {
1056     /* The bits in the following structure should only be used with
1057        accessor macros that constrain inputs with tree checking.  */
1058     struct {
1059       unsigned lang_flag_0 : 1;
1060       unsigned lang_flag_1 : 1;
1061       unsigned lang_flag_2 : 1;
1062       unsigned lang_flag_3 : 1;
1063       unsigned lang_flag_4 : 1;
1064       unsigned lang_flag_5 : 1;
1065       unsigned lang_flag_6 : 1;
1066       unsigned saturating_flag : 1;
1067
1068       unsigned unsigned_flag : 1;
1069       unsigned packed_flag : 1;
1070       unsigned user_align : 1;
1071       unsigned nameless_flag : 1;
1072       unsigned atomic_flag : 1;
1073       unsigned unavailable_flag : 1;
1074       unsigned spare0 : 2;
1075
1076       unsigned spare1 : 8;
1077
1078       /* This field is only used with TREE_TYPE nodes; the only reason it is
1079          present in tree_base instead of tree_type is to save space.  The size
1080          of the field must be large enough to hold addr_space_t values.
1081          For CONSTRUCTOR nodes this holds the clobber_kind enum.  */
1082       unsigned address_space : 8;
1083     } bits;
1084
1085     /* The following fields are present in tree_base to save space.  The
1086        nodes using them do not require any of the flags above and so can
1087        make better use of the 4-byte sized word.  */
1088
1089     /* The number of HOST_WIDE_INTs in an INTEGER_CST.  */
1090     struct {
1091       /* The number of HOST_WIDE_INTs if the INTEGER_CST is accessed in
1092          its native precision.  */
1093       unsigned char unextended;
1094
1095       /* The number of HOST_WIDE_INTs if the INTEGER_CST is extended to
1096          wider precisions based on its TYPE_SIGN.  */
1097       unsigned char extended;
1098
1099       /* The number of HOST_WIDE_INTs if the INTEGER_CST is accessed in
1100          offset_int precision, with smaller integers being extended
1101          according to their TYPE_SIGN.  This is equal to one of the two
1102          fields above but is cached for speed.  */
1103       unsigned char offset;
1104     } int_length;
1105
1106     /* VEC length.  This field is only used with TREE_VEC.  */
1107     int length;
1108
1109     /* This field is only used with VECTOR_CST.  */
1110     struct {
1111       /* The value of VECTOR_CST_LOG2_NPATTERNS.  */
1112       unsigned int log2_npatterns : 8;
1113
1114       /* The value of VECTOR_CST_NELTS_PER_PATTERN.  */
1115       unsigned int nelts_per_pattern : 8;
1116
1117       /* For future expansion.  */
1118       unsigned int unused : 16;
1119     } vector_cst;
1120
1121     /* SSA version number.  This field is only used with SSA_NAME.  */
1122     unsigned int version;
1123
1124     /* CHREC_VARIABLE.  This field is only used with POLYNOMIAL_CHREC.  */
1125     unsigned int chrec_var;
1126
1127     /* Internal function code.  */
1128     enum internal_fn ifn;
1129
1130     /* OMP_ATOMIC* memory order.  */
1131     enum omp_memory_order omp_atomic_memory_order;
1132
1133     /* The following two fields are used for MEM_REF and TARGET_MEM_REF
1134        expression trees and specify known data non-dependences.  For
1135        two memory references in a function they are known to not
1136        alias if dependence_info.clique are equal and dependence_info.base
1137        are distinct.  Clique number zero means there is no information,
1138        clique number one is populated from function global information
1139        and thus needs no remapping on transforms like loop unrolling.  */
1140     struct {
1141       unsigned short clique;
1142       unsigned short base;
1143     } dependence_info;
1144   } GTY((skip(""))) u;
1145 };
1146
1147 /* The following table lists the uses of each of the above flags and
1148    for which types of nodes they are defined.
1149
1150    addressable_flag:
1151
1152        TREE_ADDRESSABLE in
1153            VAR_DECL, PARM_DECL, RESULT_DECL, FUNCTION_DECL, LABEL_DECL
1154            SSA_NAME
1155            all types
1156            CONSTRUCTOR, IDENTIFIER_NODE
1157            STMT_EXPR
1158
1159        CALL_EXPR_TAILCALL in
1160            CALL_EXPR
1161
1162        CASE_LOW_SEEN in
1163            CASE_LABEL_EXPR
1164
1165        PREDICT_EXPR_OUTCOME in
1166            PREDICT_EXPR
1167
1168        OMP_CLAUSE_MAP_DECL_MAKE_ADDRESSABLE in
1169            OMP_CLAUSE
1170
1171    static_flag:
1172
1173        TREE_STATIC in
1174            VAR_DECL, FUNCTION_DECL
1175            CONSTRUCTOR
1176
1177        TREE_NO_TRAMPOLINE in
1178            ADDR_EXPR
1179
1180        BINFO_VIRTUAL_P in
1181            TREE_BINFO
1182
1183        TREE_SYMBOL_REFERENCED in
1184            IDENTIFIER_NODE
1185
1186        CLEANUP_EH_ONLY in
1187            TARGET_EXPR, WITH_CLEANUP_EXPR
1188
1189        TRY_CATCH_IS_CLEANUP in
1190            TRY_CATCH_EXPR
1191
1192        ASM_INPUT_P in
1193            ASM_EXPR
1194
1195        TYPE_REF_CAN_ALIAS_ALL in
1196            POINTER_TYPE, REFERENCE_TYPE
1197
1198        CASE_HIGH_SEEN in
1199            CASE_LABEL_EXPR
1200
1201        ENUM_IS_SCOPED in
1202            ENUMERAL_TYPE
1203
1204        TRANSACTION_EXPR_OUTER in
1205            TRANSACTION_EXPR
1206
1207        MUST_TAIL_CALL in
1208            CALL_EXPR
1209
1210    public_flag:
1211
1212        TREE_OVERFLOW in
1213            INTEGER_CST, REAL_CST, COMPLEX_CST, VECTOR_CST
1214
1215        TREE_PUBLIC in
1216            VAR_DECL, FUNCTION_DECL
1217            IDENTIFIER_NODE
1218
1219        CONSTRUCTOR_NO_CLEARING in
1220            CONSTRUCTOR
1221
1222        ASM_VOLATILE_P in
1223            ASM_EXPR
1224
1225        CALL_EXPR_VA_ARG_PACK in
1226            CALL_EXPR
1227
1228        TYPE_CACHED_VALUES_P in
1229            all types
1230
1231        SAVE_EXPR_RESOLVED_P in
1232            SAVE_EXPR
1233
1234        OMP_CLAUSE_LASTPRIVATE_FIRSTPRIVATE in
1235            OMP_CLAUSE_LASTPRIVATE
1236
1237        OMP_CLAUSE_PRIVATE_DEBUG in
1238            OMP_CLAUSE_PRIVATE
1239
1240        OMP_CLAUSE_LINEAR_NO_COPYIN in
1241            OMP_CLAUSE_LINEAR
1242
1243        OMP_CLAUSE_MAP_ZERO_BIAS_ARRAY_SECTION in
1244            OMP_CLAUSE_MAP
1245
1246        OMP_CLAUSE_REDUCTION_OMP_ORIG_REF in
1247            OMP_CLAUSE_{,TASK_,IN_}REDUCTION
1248
1249        OMP_CLAUSE_USE_DEVICE_PTR_IF_PRESENT in
1250            OMP_CLAUSE_USE_DEVICE_PTR
1251
1252        TRANSACTION_EXPR_RELAXED in
1253            TRANSACTION_EXPR
1254
1255        FALLTHROUGH_LABEL_P in
1256            LABEL_DECL
1257
1258        SSA_NAME_IS_VIRTUAL_OPERAND in
1259            SSA_NAME
1260
1261        EXPR_LOCATION_WRAPPER_P in
1262            NON_LVALUE_EXPR, VIEW_CONVERT_EXPR
1263
1264    private_flag:
1265
1266        TREE_PRIVATE in
1267            all decls
1268
1269        CALL_EXPR_RETURN_SLOT_OPT in
1270            CALL_EXPR
1271
1272        OMP_SECTION_LAST in
1273            OMP_SECTION
1274
1275        OMP_PARALLEL_COMBINED in
1276            OMP_PARALLEL
1277
1278        OMP_CLAUSE_PRIVATE_OUTER_REF in
1279            OMP_CLAUSE_PRIVATE
1280
1281        OMP_CLAUSE_LINEAR_NO_COPYOUT in
1282            OMP_CLAUSE_LINEAR
1283
1284        TYPE_REF_IS_RVALUE in
1285            REFERENCE_TYPE
1286
1287        ENUM_IS_OPAQUE in
1288            ENUMERAL_TYPE
1289
1290    protected_flag:
1291
1292        TREE_PROTECTED in
1293            BLOCK
1294            all decls
1295
1296        CALL_FROM_THUNK_P and
1297        CALL_ALLOCA_FOR_VAR_P and
1298        CALL_FROM_NEW_OR_DELETE_P in
1299            CALL_EXPR
1300
1301        OMP_CLAUSE_LINEAR_VARIABLE_STRIDE in
1302            OMP_CLAUSE_LINEAR
1303
1304        ASM_INLINE_P in
1305            ASM_EXPR
1306
1307    side_effects_flag:
1308
1309        TREE_SIDE_EFFECTS in
1310            all expressions
1311            all decls
1312            all constants
1313
1314        FORCED_LABEL in
1315            LABEL_DECL
1316
1317    volatile_flag:
1318
1319        TREE_THIS_VOLATILE in
1320            all expressions
1321            all decls
1322
1323        TYPE_VOLATILE in
1324            all types
1325
1326    readonly_flag:
1327
1328        TREE_READONLY in
1329            all expressions
1330            all decls
1331
1332        TYPE_READONLY in
1333            all types
1334
1335    constant_flag:
1336
1337        TREE_CONSTANT in
1338            all expressions
1339            all decls
1340            all constants
1341
1342        TYPE_SIZES_GIMPLIFIED in
1343            all types
1344
1345    unsigned_flag:
1346
1347        TYPE_UNSIGNED in
1348            all types
1349
1350        DECL_UNSIGNED in
1351            all decls
1352
1353    asm_written_flag:
1354
1355        TREE_ASM_WRITTEN in
1356            VAR_DECL, FUNCTION_DECL, TYPE_DECL
1357            RECORD_TYPE, UNION_TYPE, QUAL_UNION_TYPE
1358            BLOCK, STRING_CST
1359
1360        SSA_NAME_OCCURS_IN_ABNORMAL_PHI in
1361            SSA_NAME
1362
1363    used_flag:
1364
1365        TREE_USED in
1366            all expressions
1367            all decls
1368            IDENTIFIER_NODE
1369
1370    nothrow_flag:
1371
1372        TREE_NOTHROW in
1373            CALL_EXPR
1374            FUNCTION_DECL
1375
1376        TREE_THIS_NOTRAP in
1377           INDIRECT_REF, MEM_REF, TARGET_MEM_REF, ARRAY_REF, ARRAY_RANGE_REF
1378
1379        SSA_NAME_IN_FREE_LIST in
1380           SSA_NAME
1381
1382        DECL_NONALIASED in
1383           VAR_DECL
1384
1385    deprecated_flag:
1386
1387        TREE_DEPRECATED in
1388            all decls
1389            all types
1390
1391        IDENTIFIER_TRANSPARENT_ALIAS in
1392            IDENTIFIER_NODE
1393
1394        SSA_NAME_POINTS_TO_READONLY_MEMORY in
1395            SSA_NAME
1396
1397    unavailable_flag:
1398
1399        TREE_UNAVAILABLE in
1400            all decls
1401            all types
1402
1403    visited:
1404
1405        TREE_VISITED in
1406            all trees (used liberally by many passes)
1407
1408    saturating_flag:
1409
1410        TYPE_REVERSE_STORAGE_ORDER in
1411            RECORD_TYPE, UNION_TYPE, QUAL_UNION_TYPE, ARRAY_TYPE
1412
1413        TYPE_SATURATING in
1414            other types
1415
1416        VAR_DECL_IS_VIRTUAL_OPERAND in
1417            VAR_DECL
1418
1419    nowarning_flag:
1420
1421        TREE_NO_WARNING in
1422            all expressions
1423            all decls
1424
1425        TYPE_ARTIFICIAL in
1426            all types
1427
1428    default_def_flag:
1429
1430        TYPE_FINAL_P in
1431            RECORD_TYPE, UNION_TYPE and QUAL_UNION_TYPE
1432
1433        TYPE_VECTOR_OPAQUE in
1434            VECTOR_TYPE
1435
1436        SSA_NAME_IS_DEFAULT_DEF in
1437            SSA_NAME
1438
1439        DECL_NONLOCAL_FRAME in
1440            VAR_DECL
1441
1442        REF_REVERSE_STORAGE_ORDER in
1443            BIT_FIELD_REF, MEM_REF
1444
1445        FUNC_ADDR_BY_DESCRIPTOR in
1446            ADDR_EXPR
1447
1448        CALL_EXPR_BY_DESCRIPTOR in
1449            CALL_EXPR
1450
1451 */
1452
1453 struct GTY(()) tree_typed {
1454   struct tree_base base;
1455   tree type;
1456 };
1457
1458 struct GTY(()) tree_common {
1459   struct tree_typed typed;
1460   tree chain;
1461 };
1462
1463 struct GTY(()) tree_int_cst {
1464   struct tree_typed typed;
1465   HOST_WIDE_INT val[1];
1466 };
1467
1468
1469 struct GTY(()) tree_real_cst {
1470   struct tree_typed typed;
1471   struct real_value value;
1472 };
1473
1474 struct GTY(()) tree_fixed_cst {
1475   struct tree_typed typed;
1476   struct fixed_value * fixed_cst_ptr;
1477 };
1478
1479 struct GTY(()) tree_string {
1480   struct tree_typed typed;
1481   int length;
1482   char str[1];
1483 };
1484
1485 struct GTY(()) tree_complex {
1486   struct tree_typed typed;
1487   tree real;
1488   tree imag;
1489 };
1490
1491 struct GTY(()) tree_vector {
1492   struct tree_typed typed;
1493   tree GTY ((length ("vector_cst_encoded_nelts ((tree) &%h)"))) elts[1];
1494 };
1495
1496 struct GTY(()) tree_poly_int_cst {
1497   struct tree_typed typed;
1498   tree coeffs[NUM_POLY_INT_COEFFS];
1499 };
1500
1501 struct GTY(()) tree_identifier {
1502   struct tree_common common;
1503   struct ht_identifier id;
1504 };
1505
1506 struct GTY(()) tree_list {
1507   struct tree_common common;
1508   tree purpose;
1509   tree value;
1510 };
1511
1512 struct GTY(()) tree_vec {
1513   struct tree_common common;
1514   tree GTY ((length ("TREE_VEC_LENGTH ((tree)&%h)"))) a[1];
1515 };
1516
1517 /* A single element of a CONSTRUCTOR. VALUE holds the actual value of the
1518    element. INDEX can optionally design the position of VALUE: in arrays,
1519    it is the index where VALUE has to be placed; in structures, it is the
1520    FIELD_DECL of the member.  */
1521 struct GTY(()) constructor_elt {
1522   tree index;
1523   tree value;
1524 };
1525
1526 struct GTY(()) tree_constructor {
1527   struct tree_typed typed;
1528   vec<constructor_elt, va_gc> *elts;
1529 };
1530
1531 enum omp_clause_depend_kind
1532 {
1533   OMP_CLAUSE_DEPEND_IN,
1534   OMP_CLAUSE_DEPEND_OUT,
1535   OMP_CLAUSE_DEPEND_INOUT,
1536   OMP_CLAUSE_DEPEND_MUTEXINOUTSET,
1537   OMP_CLAUSE_DEPEND_INOUTSET,
1538   OMP_CLAUSE_DEPEND_DEPOBJ,
1539   OMP_CLAUSE_DEPEND_INVALID,
1540   OMP_CLAUSE_DEPEND_LAST
1541 };
1542
1543 enum omp_clause_doacross_kind
1544 {
1545   OMP_CLAUSE_DOACROSS_SOURCE,
1546   OMP_CLAUSE_DOACROSS_SINK,
1547   OMP_CLAUSE_DOACROSS_LAST
1548 };
1549
1550 enum omp_clause_proc_bind_kind
1551 {
1552   /* Numbers should match omp_proc_bind_t enum in omp.h.  */
1553   OMP_CLAUSE_PROC_BIND_FALSE = 0,
1554   OMP_CLAUSE_PROC_BIND_TRUE = 1,
1555   OMP_CLAUSE_PROC_BIND_PRIMARY = 2,
1556   OMP_CLAUSE_PROC_BIND_MASTER = 2,
1557   OMP_CLAUSE_PROC_BIND_CLOSE = 3,
1558   OMP_CLAUSE_PROC_BIND_SPREAD = 4,
1559   OMP_CLAUSE_PROC_BIND_LAST
1560 };
1561
1562 enum omp_clause_device_type_kind
1563 {
1564   OMP_CLAUSE_DEVICE_TYPE_HOST = 1,
1565   OMP_CLAUSE_DEVICE_TYPE_NOHOST = 2,
1566   OMP_CLAUSE_DEVICE_TYPE_ANY = 3
1567 };
1568
1569 enum omp_clause_linear_kind
1570 {
1571   OMP_CLAUSE_LINEAR_DEFAULT,
1572   OMP_CLAUSE_LINEAR_REF,
1573   OMP_CLAUSE_LINEAR_VAL,
1574   OMP_CLAUSE_LINEAR_UVAL
1575 };
1576
1577 struct GTY(()) tree_exp {
1578   struct tree_typed typed;
1579   location_t locus;
1580   tree GTY ((length ("TREE_OPERAND_LENGTH ((tree)&%h)"))) operands[1];
1581 };
1582
1583 /* Immediate use linking structure.  This structure is used for maintaining
1584    a doubly linked list of uses of an SSA_NAME.  */
1585 struct GTY(()) ssa_use_operand_t {
1586   struct ssa_use_operand_t* GTY((skip(""))) prev;
1587   struct ssa_use_operand_t* GTY((skip(""))) next;
1588   /* Immediate uses for a given SSA name are maintained as a cyclic
1589      list.  To recognize the root of this list, the location field
1590      needs to point to the original SSA name.  Since statements and
1591      SSA names are of different data types, we need this union.  See
1592      the explanation in struct imm_use_iterator.  */
1593   union { gimple *stmt; tree ssa_name; } GTY((skip(""))) loc;
1594   tree *GTY((skip(""))) use;
1595 };
1596
1597 struct GTY(()) tree_ssa_name {
1598   struct tree_typed typed;
1599
1600   /* _DECL wrapped by this SSA name.  */
1601   tree var;
1602
1603   /* Statement that defines this SSA name.  */
1604   gimple *def_stmt;
1605
1606   /* Value range information.  */
1607   union ssa_name_info_type {
1608     /* Range and aliasing info for pointers.  */
1609     struct GTY ((tag ("0"))) ptr_info_def *ptr_info;
1610     /* Range info for everything else.  */
1611     struct GTY ((tag ("1"))) vrange_storage * range_info;
1612   } GTY ((desc ("%1.typed.type ?" \
1613                 "!POINTER_TYPE_P (TREE_TYPE ((tree)&%1)) : 2"))) info;
1614   /* Immediate uses list for this SSA_NAME.  */
1615   struct ssa_use_operand_t imm_uses;
1616 };
1617
1618 struct GTY(()) phi_arg_d {
1619   /* imm_use MUST be the first element in struct because we do some
1620      pointer arithmetic with it.  See phi_arg_index_from_use.  */
1621   struct ssa_use_operand_t imm_use;
1622   tree def;
1623   location_t locus;
1624 };
1625
1626 struct GTY(()) tree_omp_clause {
1627   struct tree_common common;
1628   location_t locus;
1629   enum omp_clause_code code;
1630   union omp_clause_subcode {
1631     enum omp_clause_default_kind   default_kind;
1632     enum omp_clause_schedule_kind  schedule_kind;
1633     enum omp_clause_depend_kind    depend_kind;
1634     enum omp_clause_doacross_kind  doacross_kind;
1635     /* See include/gomp-constants.h for enum gomp_map_kind's values.  */
1636     unsigned int                   map_kind;
1637     enum omp_clause_proc_bind_kind proc_bind_kind;
1638     enum tree_code                 reduction_code;
1639     enum omp_clause_linear_kind    linear_kind;
1640     enum tree_code                 if_modifier;
1641     enum omp_clause_defaultmap_kind defaultmap_kind;
1642     enum omp_clause_bind_kind      bind_kind;
1643     enum omp_clause_device_type_kind device_type_kind;
1644   } GTY ((skip)) subcode;
1645
1646   /* The gimplification of OMP_CLAUSE_REDUCTION_{INIT,MERGE} for omp-low's
1647      usage.  */
1648   gimple_seq gimple_reduction_init;
1649   gimple_seq gimple_reduction_merge;
1650
1651   tree GTY ((length ("omp_clause_num_ops[OMP_CLAUSE_CODE ((tree)&%h)]")))
1652     ops[1];
1653 };
1654
1655 struct GTY(()) tree_block {
1656   struct tree_base base;
1657   tree chain;
1658
1659   unsigned block_num;
1660
1661   location_t locus;
1662   location_t end_locus;
1663
1664   tree vars;
1665   vec<tree, va_gc> *nonlocalized_vars;
1666
1667   tree subblocks;
1668   tree supercontext;
1669   tree abstract_origin;
1670   tree fragment_origin;
1671   tree fragment_chain;
1672
1673   /* Pointer to the DWARF lexical block.  */
1674   struct die_struct *die;
1675 };
1676
1677 struct GTY(()) tree_type_common {
1678   struct tree_common common;
1679   tree size;
1680   tree size_unit;
1681   tree attributes;
1682   unsigned int uid;
1683
1684   ENUM_BITFIELD(machine_mode) mode : MACHINE_MODE_BITSIZE;
1685
1686   unsigned int precision : 16;
1687   unsigned lang_flag_0 : 1;
1688   unsigned lang_flag_1 : 1;
1689   unsigned lang_flag_2 : 1;
1690   unsigned lang_flag_3 : 1;
1691   unsigned lang_flag_4 : 1;
1692   unsigned lang_flag_5 : 1;
1693   unsigned lang_flag_6 : 1;
1694   unsigned lang_flag_7 : 1;
1695
1696   /* TYPE_ALIGN in log2; this has to be large enough to hold values
1697      of the maximum of BIGGEST_ALIGNMENT and MAX_OFILE_ALIGNMENT,
1698      the latter being usually the larger.  For ELF it is 8<<28,
1699      so we need to store the value 32 (not 31, as we need the zero
1700      as well), hence six bits.  */
1701   unsigned align : 6;
1702   /* TYPE_STRING_FLAG for INTEGER_TYPE and ARRAY_TYPE.
1703      TYPE_CXX_ODR_P for RECORD_TYPE and UNION_TYPE.  */
1704   unsigned string_flag : 1;
1705   unsigned no_force_blk_flag : 1;
1706
1707   unsigned warn_if_not_align : 6;
1708   unsigned needs_constructing_flag : 1;
1709   unsigned transparent_aggr_flag : 1;
1710
1711   unsigned contains_placeholder_bits : 2;
1712   unsigned restrict_flag : 1;
1713   unsigned typeless_storage : 1;
1714   unsigned empty_flag : 1;
1715   unsigned indivisible_p : 1;
1716   /* TYPE_NO_NAMED_ARGS_STDARG_P for a stdarg function.
1717      Or TYPE_INCLUDES_FLEXARRAY for RECORD_TYPE and UNION_TYPE.  */
1718   unsigned no_named_args_stdarg_p : 1;
1719   unsigned spare : 1;
1720
1721   alias_set_type alias_set;
1722   tree pointer_to;
1723   tree reference_to;
1724   union tree_type_symtab {
1725     int GTY ((tag ("TYPE_SYMTAB_IS_ADDRESS"))) address;
1726     struct die_struct * GTY ((tag ("TYPE_SYMTAB_IS_DIE"))) die;
1727   } GTY ((desc ("debug_hooks->tree_type_symtab_field"))) symtab;
1728   tree canonical;
1729   tree next_variant;
1730   tree main_variant;
1731   tree context;
1732   tree name;
1733 };
1734
1735 struct GTY(()) tree_type_with_lang_specific {
1736   struct tree_type_common common;
1737   /* Points to a structure whose details depend on the language in use.  */
1738   struct lang_type *lang_specific;
1739 };
1740
1741 struct GTY(()) tree_type_non_common {
1742   struct tree_type_with_lang_specific with_lang_specific;
1743   tree values;
1744   tree minval;
1745   tree maxval;
1746   tree lang_1;
1747 };
1748
1749 struct GTY (()) tree_binfo {
1750   struct tree_common common;
1751
1752   tree offset;
1753   tree vtable;
1754   tree virtuals;
1755   tree vptr_field;
1756   vec<tree, va_gc> *base_accesses;
1757   tree inheritance;
1758
1759   tree vtt_subvtt;
1760   tree vtt_vptr;
1761
1762   vec<tree, va_gc> base_binfos;
1763 };
1764
1765 struct GTY(()) tree_decl_minimal {
1766   struct tree_common common;
1767   location_t locus;
1768   unsigned int uid;
1769   tree name;
1770   tree context;
1771 };
1772
1773 struct GTY(()) tree_decl_common {
1774   struct tree_decl_minimal common;
1775   tree size;
1776
1777   ENUM_BITFIELD(machine_mode) mode : MACHINE_MODE_BITSIZE;
1778
1779   unsigned nonlocal_flag : 1;
1780   unsigned virtual_flag : 1;
1781   unsigned ignored_flag : 1;
1782   unsigned abstract_flag : 1;
1783   unsigned artificial_flag : 1;
1784   unsigned preserve_flag: 1;
1785   unsigned debug_expr_is_from : 1;
1786
1787   unsigned lang_flag_0 : 1;
1788   unsigned lang_flag_1 : 1;
1789   unsigned lang_flag_2 : 1;
1790   unsigned lang_flag_3 : 1;
1791   unsigned lang_flag_4 : 1;
1792   unsigned lang_flag_5 : 1;
1793   unsigned lang_flag_6 : 1;
1794   unsigned lang_flag_7 : 1;
1795   unsigned lang_flag_8 : 1;
1796
1797   /* In VAR_DECL and PARM_DECL, this is DECL_REGISTER
1798      In TRANSLATION_UNIT_DECL, this is TRANSLATION_UNIT_WARN_EMPTY_P.
1799      In FIELD_DECL, this is DECL_FIELD_ABI_IGNORED.  */
1800   unsigned decl_flag_0 : 1;
1801   /* In FIELD_DECL, this is DECL_BIT_FIELD
1802      In VAR_DECL and FUNCTION_DECL, this is DECL_EXTERNAL.
1803      In TYPE_DECL, this is TYPE_DECL_SUPPRESS_DEBUG.  */
1804   unsigned decl_flag_1 : 1;
1805   /* In FIELD_DECL, this is DECL_NONADDRESSABLE_P
1806      In VAR_DECL, PARM_DECL and RESULT_DECL, this is
1807      DECL_HAS_VALUE_EXPR_P.  */
1808   unsigned decl_flag_2 : 1;
1809   /* In FIELD_DECL, this is DECL_PADDING_P.
1810      In VAR_DECL, this is DECL_MERGEABLE.  */
1811   unsigned decl_flag_3 : 1;
1812   /* Logically, these two would go in a theoretical base shared by var and
1813      parm decl. */
1814   unsigned not_gimple_reg_flag : 1;
1815   /* In VAR_DECL, PARM_DECL and RESULT_DECL, this is DECL_BY_REFERENCE.  */
1816   unsigned decl_by_reference_flag : 1;
1817   /* In a VAR_DECL and PARM_DECL, this is DECL_READ_P.  */
1818   unsigned decl_read_flag : 1;
1819   /* In a VAR_DECL or RESULT_DECL, this is DECL_NONSHAREABLE.  */
1820   /* In a PARM_DECL, this is DECL_HIDDEN_STRING_LENGTH.  */
1821   unsigned decl_nonshareable_flag : 1;
1822
1823   /* DECL_OFFSET_ALIGN, used only for FIELD_DECLs.  */
1824   unsigned int off_align : 6;
1825
1826   /* DECL_ALIGN.  It should have the same size as TYPE_ALIGN.  */
1827   unsigned int align : 6;
1828
1829   /* DECL_WARN_IF_NOT_ALIGN.  It should have the same size as
1830      TYPE_WARN_IF_NOT_ALIGN.  */
1831   unsigned int warn_if_not_align : 6;
1832
1833   /* In FIELD_DECL, this is DECL_NOT_FLEXARRAY.  */
1834   unsigned int decl_not_flexarray : 1;
1835
1836   /* 5 bits unused.  */
1837
1838   /* UID for points-to sets, stable over copying from inlining.  */
1839   unsigned int pt_uid;
1840
1841   tree size_unit;
1842   tree initial;
1843   tree attributes;
1844   tree abstract_origin;
1845
1846   /* Points to a structure whose details depend on the language in use.  */
1847   struct lang_decl *lang_specific;
1848 };
1849
1850 struct GTY(()) tree_decl_with_rtl {
1851   struct tree_decl_common common;
1852   rtx rtl;
1853 };
1854
1855 struct GTY(()) tree_field_decl {
1856   struct tree_decl_common common;
1857
1858   tree offset;
1859   tree bit_field_type;
1860   tree qualifier;
1861   tree bit_offset;
1862   tree fcontext;
1863 };
1864
1865 struct GTY(()) tree_label_decl {
1866   struct tree_decl_with_rtl common;
1867   int label_decl_uid;
1868   int eh_landing_pad_nr;
1869 };
1870
1871 struct GTY(()) tree_result_decl {
1872   struct tree_decl_with_rtl common;
1873 };
1874
1875 struct GTY(()) tree_const_decl {
1876   struct tree_decl_common common;
1877 };
1878
1879 struct GTY(()) tree_parm_decl {
1880   struct tree_decl_with_rtl common;
1881   rtx incoming_rtl;
1882 };
1883
1884 struct GTY(()) tree_decl_with_vis {
1885  struct tree_decl_with_rtl common;
1886  tree assembler_name;
1887  struct symtab_node *symtab_node;
1888
1889  /* Belong to VAR_DECL exclusively.  */
1890  unsigned defer_output : 1;
1891  unsigned hard_register : 1;
1892  unsigned common_flag : 1;
1893  unsigned in_text_section : 1;
1894  unsigned in_constant_pool : 1;
1895  unsigned dllimport_flag : 1;
1896  /* Don't belong to VAR_DECL exclusively.  */
1897  unsigned weak_flag : 1;
1898
1899  unsigned seen_in_bind_expr : 1;
1900  unsigned comdat_flag : 1;
1901  /* Used for FUNCTION_DECL, VAR_DECL and in C++ for TYPE_DECL.  */
1902  ENUM_BITFIELD(symbol_visibility) visibility : 2;
1903  unsigned visibility_specified : 1;
1904
1905  /* Belong to FUNCTION_DECL exclusively.  */
1906  unsigned init_priority_p : 1;
1907  /* Used by C++ only.  Might become a generic decl flag.  */
1908  unsigned shadowed_for_var_p : 1;
1909  /* Belong to FUNCTION_DECL exclusively.  */
1910  unsigned cxx_constructor : 1;
1911  /* Belong to FUNCTION_DECL exclusively.  */
1912  unsigned cxx_destructor : 1;
1913  /* Belong to FUNCTION_DECL exclusively.  */
1914  unsigned final : 1;
1915  /* Belong to FUNCTION_DECL exclusively.  */
1916  unsigned regdecl_flag : 1;
1917  /* 14 unused bits. */
1918  /* 32 more unused on 64 bit HW. */
1919 };
1920
1921 struct GTY(()) tree_var_decl {
1922   struct tree_decl_with_vis common;
1923 };
1924
1925 struct GTY(()) tree_decl_non_common {
1926   struct tree_decl_with_vis common;
1927   /* Almost all FE's use this.  */
1928   tree result;
1929 };
1930
1931 /* Classify a special function declaration type.  */
1932
1933 enum function_decl_type
1934 {
1935   NONE,
1936   OPERATOR_NEW,
1937   OPERATOR_DELETE,
1938   LAMBDA_FUNCTION
1939
1940   /* 0 values left */
1941 };
1942
1943 /* FUNCTION_DECL inherits from DECL_NON_COMMON because of the use of the
1944    arguments/result/saved_tree fields by front ends.   It was either inherit
1945    FUNCTION_DECL from non_common, or inherit non_common from FUNCTION_DECL,
1946    which seemed a bit strange.  */
1947
1948 struct GTY(()) tree_function_decl {
1949   struct tree_decl_non_common common;
1950
1951   struct function *f;
1952
1953   /* Arguments of the function.  */
1954   tree arguments;
1955   /* The personality function. Used for stack unwinding. */
1956   tree personality;
1957
1958   /* Function specific options that are used by this function.  */
1959   tree function_specific_target;        /* target options */
1960   tree function_specific_optimization;  /* optimization options */
1961
1962   /* Generic function body.  */
1963   tree saved_tree;
1964   /* Index within a virtual table.  */
1965   tree vindex;
1966
1967   /* In a FUNCTION_DECL this is DECL_UNCHECKED_FUNCTION_CODE.  */
1968   unsigned int function_code;
1969
1970   ENUM_BITFIELD(built_in_class) built_in_class : 2;
1971   unsigned static_ctor_flag : 1;
1972   unsigned static_dtor_flag : 1;
1973   unsigned uninlinable : 1;
1974   unsigned possibly_inlined : 1;
1975   unsigned novops_flag : 1;
1976   unsigned returns_twice_flag : 1;
1977
1978   unsigned malloc_flag : 1;
1979   unsigned declared_inline_flag : 1;
1980   unsigned no_inline_warning_flag : 1;
1981   unsigned no_instrument_function_entry_exit : 1;
1982   unsigned no_limit_stack : 1;
1983   unsigned disregard_inline_limits : 1;
1984   unsigned pure_flag : 1;
1985   unsigned looping_const_or_pure_flag : 1;
1986
1987   /* Align the bitfield to boundary of a byte.  */
1988   ENUM_BITFIELD(function_decl_type) decl_type: 2;
1989   unsigned has_debug_args_flag : 1;
1990   unsigned versioned_function : 1;
1991   unsigned replaceable_operator : 1;
1992
1993   /* 11 bits left for future expansion.  */
1994   /* 32 bits on 64-bit HW.  */
1995 };
1996
1997 struct GTY(()) tree_translation_unit_decl {
1998   struct tree_decl_common common;
1999   /* Source language of this translation unit.  Used for DWARF output.  */
2000   const char *language;
2001   /* TODO: Non-optimization used to build this translation unit.  */
2002   /* TODO: Root of a partial DWARF tree for global types and decls.  */
2003 };
2004
2005 struct GTY(()) tree_type_decl {
2006   struct tree_decl_non_common common;
2007
2008 };
2009
2010 struct GTY ((chain_next ("%h.next"), chain_prev ("%h.prev"))) tree_statement_list_node
2011  {
2012   struct tree_statement_list_node *prev;
2013   struct tree_statement_list_node *next;
2014   tree stmt;
2015 };
2016
2017 struct GTY(()) tree_statement_list
2018  {
2019   struct tree_typed typed;
2020   struct tree_statement_list_node *head;
2021   struct tree_statement_list_node *tail;
2022 };
2023
2024
2025 /* Optimization options used by a function.  */
2026
2027 struct GTY(()) tree_optimization_option {
2028   struct tree_base base;
2029
2030   /* The optimization options used by the user.  */
2031   struct cl_optimization *opts;
2032
2033   /* Target optabs for this set of optimization options.  This is of
2034      type `struct target_optabs *'.  */
2035   void *GTY ((atomic)) optabs;
2036
2037   /* The value of this_target_optabs against which the optabs above were
2038      generated.  */
2039   struct target_optabs *GTY ((skip)) base_optabs;
2040 };
2041
2042 /* Forward declaration, defined in target-globals.h.  */
2043
2044 class GTY(()) target_globals;
2045
2046 /* Target options used by a function.  */
2047
2048 struct GTY(()) tree_target_option {
2049   struct tree_base base;
2050
2051   /* Target globals for the corresponding target option.  */
2052   class target_globals *globals;
2053
2054   /* The optimization options used by the user.  */
2055   struct cl_target_option *opts;
2056 };
2057
2058 /* Define the overall contents of a tree node.
2059    It may be any of the structures declared above
2060    for various types of node.  */
2061 union GTY ((ptr_alias (union lang_tree_node),
2062             desc ("tree_node_structure (&%h)"), variable_size)) tree_node {
2063   struct tree_base GTY ((tag ("TS_BASE"))) base;
2064   struct tree_typed GTY ((tag ("TS_TYPED"))) typed;
2065   struct tree_common GTY ((tag ("TS_COMMON"))) common;
2066   struct tree_int_cst GTY ((tag ("TS_INT_CST"))) int_cst;
2067   struct tree_poly_int_cst GTY ((tag ("TS_POLY_INT_CST"))) poly_int_cst;
2068   struct tree_real_cst GTY ((tag ("TS_REAL_CST"))) real_cst;
2069   struct tree_fixed_cst GTY ((tag ("TS_FIXED_CST"))) fixed_cst;
2070   struct tree_vector GTY ((tag ("TS_VECTOR"))) vector;
2071   struct tree_string GTY ((tag ("TS_STRING"))) string;
2072   struct tree_complex GTY ((tag ("TS_COMPLEX"))) complex;
2073   struct tree_identifier GTY ((tag ("TS_IDENTIFIER"))) identifier;
2074   struct tree_decl_minimal GTY((tag ("TS_DECL_MINIMAL"))) decl_minimal;
2075   struct tree_decl_common GTY ((tag ("TS_DECL_COMMON"))) decl_common;
2076   struct tree_decl_with_rtl GTY ((tag ("TS_DECL_WRTL"))) decl_with_rtl;
2077   struct tree_decl_non_common  GTY ((tag ("TS_DECL_NON_COMMON")))
2078     decl_non_common;
2079   struct tree_parm_decl  GTY  ((tag ("TS_PARM_DECL"))) parm_decl;
2080   struct tree_decl_with_vis GTY ((tag ("TS_DECL_WITH_VIS"))) decl_with_vis;
2081   struct tree_var_decl GTY ((tag ("TS_VAR_DECL"))) var_decl;
2082   struct tree_field_decl GTY ((tag ("TS_FIELD_DECL"))) field_decl;
2083   struct tree_label_decl GTY ((tag ("TS_LABEL_DECL"))) label_decl;
2084   struct tree_result_decl GTY ((tag ("TS_RESULT_DECL"))) result_decl;
2085   struct tree_const_decl GTY ((tag ("TS_CONST_DECL"))) const_decl;
2086   struct tree_type_decl GTY ((tag ("TS_TYPE_DECL"))) type_decl;
2087   struct tree_function_decl GTY ((tag ("TS_FUNCTION_DECL"))) function_decl;
2088   struct tree_translation_unit_decl GTY ((tag ("TS_TRANSLATION_UNIT_DECL")))
2089     translation_unit_decl;
2090   struct tree_type_common GTY ((tag ("TS_TYPE_COMMON"))) type_common;
2091   struct tree_type_with_lang_specific GTY ((tag ("TS_TYPE_WITH_LANG_SPECIFIC")))
2092     type_with_lang_specific;
2093   struct tree_type_non_common GTY ((tag ("TS_TYPE_NON_COMMON")))
2094     type_non_common;
2095   struct tree_list GTY ((tag ("TS_LIST"))) list;
2096   struct tree_vec GTY ((tag ("TS_VEC"))) vec;
2097   struct tree_exp GTY ((tag ("TS_EXP"))) exp;
2098   struct tree_ssa_name GTY ((tag ("TS_SSA_NAME"))) ssa_name;
2099   struct tree_block GTY ((tag ("TS_BLOCK"))) block;
2100   struct tree_binfo GTY ((tag ("TS_BINFO"))) binfo;
2101   struct tree_statement_list GTY ((tag ("TS_STATEMENT_LIST"))) stmt_list;
2102   struct tree_constructor GTY ((tag ("TS_CONSTRUCTOR"))) constructor;
2103   struct tree_omp_clause GTY ((tag ("TS_OMP_CLAUSE"))) omp_clause;
2104   struct tree_optimization_option GTY ((tag ("TS_OPTIMIZATION"))) optimization;
2105   struct tree_target_option GTY ((tag ("TS_TARGET_OPTION"))) target_option;
2106 };
2107
2108 /* Structure describing an attribute and a function to handle it.  */
2109 struct attribute_spec {
2110   /* The name of the attribute (without any leading or trailing __),
2111      or NULL to mark the end of a table of attributes.  */
2112   const char *name;
2113   /* The minimum length of the list of arguments of the attribute.  */
2114   int min_length;
2115   /* The maximum length of the list of arguments of the attribute
2116      (-1 for no maximum).  It can also be -2 for fake attributes
2117      created for the sake of -Wno-attributes; in that case, we
2118      should skip the balanced token sequence when parsing the attribute.  */
2119   int max_length;
2120   /* Whether this attribute requires a DECL.  If it does, it will be passed
2121      from types of DECLs, function return types and array element types to
2122      the DECLs, function types and array types respectively; but when
2123      applied to a type in any other circumstances, it will be ignored with
2124      a warning.  (If greater control is desired for a given attribute,
2125      this should be false, and the flags argument to the handler may be
2126      used to gain greater control in that case.)  */
2127   bool decl_required;
2128   /* Whether this attribute requires a type.  If it does, it will be passed
2129      from a DECL to the type of that DECL.  */
2130   bool type_required;
2131   /* Whether this attribute requires a function (or method) type.  If it does,
2132      it will be passed from a function pointer type to the target type,
2133      and from a function return type (which is not itself a function
2134      pointer type) to the function type.  */
2135   bool function_type_required;
2136   /* Specifies if attribute affects type's identity.  */
2137   bool affects_type_identity;
2138   /* Function to handle this attribute.  NODE points to a tree[3] array,
2139      where node[0] is the node to which the attribute is to be applied;
2140      node[1] is the last pushed/merged declaration if one exists, and node[2]
2141      may be the declaration for node[0].  If a DECL, it should be modified in
2142      place; if a TYPE, a copy should be created.  NAME is the canonicalized
2143      name of the attribute i.e. without any leading or trailing underscores.
2144      ARGS is the TREE_LIST of the arguments (which may be NULL).  FLAGS gives
2145      further information about the context of the attribute.  Afterwards, the
2146      attributes will be added to the DECL_ATTRIBUTES or TYPE_ATTRIBUTES, as
2147      appropriate, unless *NO_ADD_ATTRS is set to true (which should be done on
2148      error, as well as in any other cases when the attributes should not be
2149      added to the DECL or TYPE).  Depending on FLAGS, any attributes to be
2150      applied to another type or DECL later may be returned;
2151      otherwise the return value should be NULL_TREE.  This pointer may be
2152      NULL if no special handling is required beyond the checks implied
2153      by the rest of this structure.  */
2154   tree (*handler) (tree *node, tree name, tree args,
2155                    int flags, bool *no_add_attrs);
2156
2157   /* Specifies the name of an attribute that's mutually exclusive with
2158      this one, and whether the relationship applies to the function,
2159      variable, or type form of the attribute.  */
2160   struct exclusions {
2161     const char *name;
2162     bool function;
2163     bool variable;
2164     bool type;
2165   };
2166
2167   /* An array of attribute exclusions describing names of other attributes
2168      that this attribute is mutually exclusive with.  */
2169   const exclusions *exclude;
2170 };
2171
2172 /* These functions allow a front-end to perform a manual layout of a
2173    RECORD_TYPE.  (For instance, if the placement of subsequent fields
2174    depends on the placement of fields so far.)  Begin by calling
2175    start_record_layout.  Then, call place_field for each of the
2176    fields.  Then, call finish_record_layout.  See layout_type for the
2177    default way in which these functions are used.  */
2178 typedef struct record_layout_info_s {
2179   /* The RECORD_TYPE that we are laying out.  */
2180   tree t;
2181   /* The offset into the record so far, in bytes, not including bits in
2182      BITPOS.  */
2183   tree offset;
2184   /* The last known alignment of SIZE.  */
2185   unsigned int offset_align;
2186   /* The bit position within the last OFFSET_ALIGN bits, in bits.  */
2187   tree bitpos;
2188   /* The alignment of the record so far, in bits.  */
2189   unsigned int record_align;
2190   /* The alignment of the record so far, ignoring #pragma pack and
2191      __attribute__ ((packed)), in bits.  */
2192   unsigned int unpacked_align;
2193   /* The previous field laid out.  */
2194   tree prev_field;
2195   /* The static variables (i.e., class variables, as opposed to
2196      instance variables) encountered in T.  */
2197   vec<tree, va_gc> *pending_statics;
2198   /* Bits remaining in the current alignment group */
2199   int remaining_in_alignment;
2200   /* True if we've seen a packed field that didn't have normal
2201      alignment anyway.  */
2202   int packed_maybe_necessary;
2203 } *record_layout_info;
2204
2205 /* Iterator for going through the function arguments.  */
2206 struct function_args_iterator {
2207   tree next;                    /* TREE_LIST pointing to the next argument */
2208 };
2209
2210 /* Structures to map from a tree to another tree.  */
2211 struct GTY(()) tree_map_base {
2212   tree from;
2213 };
2214
2215 /* Map from a tree to another tree.  */
2216
2217 struct GTY((for_user)) tree_map {
2218   struct tree_map_base base;
2219   unsigned int hash;
2220   tree to;
2221 };
2222
2223 /* Map from a decl tree to another tree.  */
2224 struct GTY((for_user)) tree_decl_map {
2225   struct tree_map_base base;
2226   tree to;
2227 };
2228
2229 /* Map from a tree to an int.  */
2230 struct GTY((for_user)) tree_int_map {
2231   struct tree_map_base base;
2232   unsigned int to;
2233 };
2234
2235 /* Map from a decl tree to a tree vector.  */
2236 struct GTY((for_user)) tree_vec_map {
2237   struct tree_map_base base;
2238   vec<tree, va_gc> *to;
2239 };
2240
2241 /* Abstract iterators for CALL_EXPRs.  These static inline definitions
2242    have to go towards the end of tree.h so that union tree_node is fully
2243    defined by this point.  */
2244
2245 /* Structure containing iterator state.  */
2246 struct call_expr_arg_iterator {
2247   tree t;       /* the call_expr */
2248   int n;        /* argument count */
2249   int i;        /* next argument index */
2250 };
2251
2252 struct const_call_expr_arg_iterator {
2253   const_tree t; /* the call_expr */
2254   int n;        /* argument count */
2255   int i;        /* next argument index */
2256 };
2257
2258 /* The builtin_info structure holds the FUNCTION_DECL of the standard builtin
2259    function, and flags.  */
2260 struct GTY(()) builtin_info_type {
2261   tree decl;
2262   /* Whether the user can use <xxx> instead of explicitly using calls
2263      to __builtin_<xxx>.  */
2264   unsigned implicit_p : 1;
2265   /* Whether the user has provided a declaration of <xxx>.  */
2266   unsigned declared_p : 1;
2267 };
2268
2269 /* Information about a _FloatN or _FloatNx type that may be
2270    supported.  */
2271 struct floatn_type_info {
2272   /* The number N in the type name.  */
2273   int n;
2274   /* Whether it is an extended type _FloatNx (true) or an interchange
2275      type (false).  */
2276   bool extended;
2277 };
2278
2279
2280 /*---------------------------------------------------------------------------
2281                                 Global variables
2282 ---------------------------------------------------------------------------*/
2283 /* Matrix describing the structures contained in a given tree code.  */
2284 extern bool tree_contains_struct[MAX_TREE_CODES][64];
2285
2286 /* Class of tree given its code.  */
2287 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) TYPE,
2288 #define END_OF_BASE_TREE_CODES tcc_exceptional,
2289
2290 #if __cpp_inline_variables < 201606L
2291 template <int N>
2292 struct tree_code_type_tmpl {
2293   static constexpr enum tree_code_class tree_code_type[] = {
2294 #include "all-tree.def"
2295   };
2296 };
2297
2298 template <int N>
2299 constexpr enum tree_code_class tree_code_type_tmpl<N>::tree_code_type[];
2300 #else
2301 constexpr inline enum tree_code_class tree_code_type[] = {
2302 #include "all-tree.def"
2303 };
2304 #endif
2305
2306 #undef DEFTREECODE
2307 #undef END_OF_BASE_TREE_CODES
2308
2309 /* Each tree code class has an associated string representation.
2310    These must correspond to the tree_code_class entries.  */
2311 extern const char *const tree_code_class_strings[];
2312
2313 /* Number of argument-words in each kind of tree-node.  */
2314
2315 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) LENGTH,
2316 #define END_OF_BASE_TREE_CODES 0,
2317
2318 #if __cpp_inline_variables < 201606L
2319 template <int N>
2320 struct tree_code_length_tmpl {
2321   static constexpr unsigned char tree_code_length[] = {
2322 #include "all-tree.def"
2323   };
2324 };
2325
2326 template <int N>
2327 constexpr unsigned char tree_code_length_tmpl<N>::tree_code_length[];
2328 #else
2329 constexpr inline unsigned char tree_code_length[] = {
2330 #include "all-tree.def"
2331 };
2332 #endif
2333
2334 #undef DEFTREECODE
2335 #undef END_OF_BASE_TREE_CODES
2336
2337 /* Vector of all alias pairs for global symbols.  */
2338 extern GTY(()) vec<alias_pair, va_gc> *alias_pairs;
2339
2340 /* Names of all the built_in classes.  */
2341 extern const char *const built_in_class_names[BUILT_IN_LAST];
2342
2343 /* Names of all the built_in functions.  */
2344 extern const char * built_in_names[(int) END_BUILTINS];
2345
2346 /* Number of operands and names for each OMP_CLAUSE node.  */
2347 extern unsigned const char omp_clause_num_ops[];
2348 extern const char * const omp_clause_code_name[];
2349 extern const char *user_omp_clause_code_name (tree, bool);
2350
2351 /* A vector of all translation-units.  */
2352 extern GTY (()) vec<tree, va_gc> *all_translation_units;
2353
2354 /* Vector of standard trees used by the C compiler.  */
2355 extern GTY(()) tree global_trees[TI_MAX];
2356
2357 /* The standard C integer types.  Use integer_type_kind to index into
2358    this array.  */
2359 extern GTY(()) tree integer_types[itk_none];
2360
2361 /* Types used to represent sizes.  */
2362 extern GTY(()) tree sizetype_tab[(int) stk_type_kind_last];
2363
2364 /* Arrays for keeping track of tree node statistics.  */
2365 extern uint64_t tree_node_counts[];
2366 extern uint64_t tree_node_sizes[];
2367
2368 /* True if we are in gimple form and the actions of the folders need to
2369    be restricted.  False if we are not in gimple form and folding is not
2370    restricted to creating gimple expressions.  */
2371 extern bool in_gimple_form;
2372
2373 /* Functional interface to the builtin functions.  */
2374 extern GTY(()) builtin_info_type builtin_info[(int)END_BUILTINS];
2375
2376 /* If nonzero, an upper limit on alignment of structure fields, in bits,  */
2377 extern unsigned int maximum_field_alignment;
2378
2379 /* Points to the FUNCTION_DECL of the function whose body we are reading.  */
2380 extern GTY(()) tree current_function_decl;
2381
2382 /* Nonzero means a FUNC_BEGIN label was emitted.  */
2383 extern GTY(()) const char * current_function_func_begin_label;
2384
2385 /* Information about the _FloatN and _FloatNx types.  */
2386 extern const floatn_type_info floatn_nx_types[NUM_FLOATN_NX_TYPES];
2387
2388 #endif  // GCC_TREE_CORE_H