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_MASK = 7 * (OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK + 1)
 576 };
 577
 578 enum omp_clause_bind_kind {
 579   OMP_CLAUSE_BIND_TEAMS,
 580   OMP_CLAUSE_BIND_PARALLEL,
 581   OMP_CLAUSE_BIND_THREAD
 582 };
 583
 584 /* memory-order-clause on OpenMP atomic/flush constructs or
 585    argument of atomic_default_mem_order clause.  */
 586 enum omp_memory_order {
 587   OMP_MEMORY_ORDER_UNSPECIFIED,
 588   OMP_MEMORY_ORDER_RELAXED,
 589   OMP_MEMORY_ORDER_ACQUIRE,
 590   OMP_MEMORY_ORDER_RELEASE,
 591   OMP_MEMORY_ORDER_ACQ_REL,
 592   OMP_MEMORY_ORDER_SEQ_CST,
 593   OMP_MEMORY_ORDER_MASK = 7,
 594   OMP_FAIL_MEMORY_ORDER_UNSPECIFIED = OMP_MEMORY_ORDER_UNSPECIFIED * 8,
 595   OMP_FAIL_MEMORY_ORDER_RELAXED = OMP_MEMORY_ORDER_RELAXED * 8,
 596   OMP_FAIL_MEMORY_ORDER_ACQUIRE = OMP_MEMORY_ORDER_ACQUIRE * 8,
 597   OMP_FAIL_MEMORY_ORDER_RELEASE = OMP_MEMORY_ORDER_RELEASE * 8,
 598   OMP_FAIL_MEMORY_ORDER_ACQ_REL = OMP_MEMORY_ORDER_ACQ_REL * 8,
 599   OMP_FAIL_MEMORY_ORDER_SEQ_CST = OMP_MEMORY_ORDER_SEQ_CST * 8,
 600   OMP_FAIL_MEMORY_ORDER_MASK = OMP_MEMORY_ORDER_MASK * 8
 601 };
 602 #define OMP_FAIL_MEMORY_ORDER_SHIFT 3
 603
 604 /* There is a TYPE_QUAL value for each type qualifier.  They can be
 605    combined by bitwise-or to form the complete set of qualifiers for a
 606    type.  */
 607 enum cv_qualifier {
 608   TYPE_UNQUALIFIED   = 0x0,
 609   TYPE_QUAL_CONST    = 0x1,
 610   TYPE_QUAL_VOLATILE = 0x2,
 611   TYPE_QUAL_RESTRICT = 0x4,
 612   TYPE_QUAL_ATOMIC   = 0x8
 613 };
 614
 615 /* Standard named or nameless data types of the C compiler.  */
 616 enum tree_index {
 617   TI_ERROR_MARK,
 618   TI_INTQI_TYPE,
 619   TI_INTHI_TYPE,
 620   TI_INTSI_TYPE,
 621   TI_INTDI_TYPE,
 622   TI_INTTI_TYPE,
 623
 624   TI_UINTQI_TYPE,
 625   TI_UINTHI_TYPE,
 626   TI_UINTSI_TYPE,
 627   TI_UINTDI_TYPE,
 628   TI_UINTTI_TYPE,
 629
 630   TI_ATOMICQI_TYPE,
 631   TI_ATOMICHI_TYPE,
 632   TI_ATOMICSI_TYPE,
 633   TI_ATOMICDI_TYPE,
 634   TI_ATOMICTI_TYPE,
 635
 636   TI_UINT16_TYPE,
 637   TI_UINT32_TYPE,
 638   TI_UINT64_TYPE,
 639   TI_UINT128_TYPE,
 640
 641   TI_VOID,
 642
 643   TI_INTEGER_ZERO,
 644   TI_INTEGER_ONE,
 645   TI_INTEGER_THREE,
 646   TI_INTEGER_MINUS_ONE,
 647   TI_NULL_POINTER,
 648
 649   TI_SIZE_ZERO,
 650   TI_SIZE_ONE,
 651
 652   TI_BITSIZE_ZERO,
 653   TI_BITSIZE_ONE,
 654   TI_BITSIZE_UNIT,
 655
 656   TI_PUBLIC,
 657   TI_PROTECTED,
 658   TI_PRIVATE,
 659
 660   TI_BOOLEAN_FALSE,
 661   TI_BOOLEAN_TRUE,
 662
 663   TI_FLOAT_TYPE,
 664   TI_DOUBLE_TYPE,
 665   TI_LONG_DOUBLE_TYPE,
 666
 667   /* __bf16 type if supported (used in C++ as std::bfloat16_t).  */
 668   TI_BFLOAT16_TYPE,
 669
 670   /* The _FloatN and _FloatNx types must be consecutive, and in the
 671      same sequence as the corresponding complex types, which must also
 672      be consecutive; _FloatN must come before _FloatNx; the order must
 673      also be the same as in the floatn_nx_types array and the RID_*
 674      values in c-common.h.  This is so that iterations over these
 675      types work as intended.  */
 676   TI_FLOAT16_TYPE,
 677   TI_FLOATN_TYPE_FIRST = TI_FLOAT16_TYPE,
 678   TI_FLOATN_NX_TYPE_FIRST = TI_FLOAT16_TYPE,
 679   TI_FLOAT32_TYPE,
 680   TI_FLOAT64_TYPE,
 681   TI_FLOAT128_TYPE,
 682   TI_FLOATN_TYPE_LAST = TI_FLOAT128_TYPE,
 683 #define NUM_FLOATN_TYPES (TI_FLOATN_TYPE_LAST - TI_FLOATN_TYPE_FIRST + 1)
 684   TI_FLOAT32X_TYPE,
 685   TI_FLOATNX_TYPE_FIRST = TI_FLOAT32X_TYPE,
 686   TI_FLOAT64X_TYPE,
 687   TI_FLOAT128X_TYPE,
 688   TI_FLOATNX_TYPE_LAST = TI_FLOAT128X_TYPE,
 689   TI_FLOATN_NX_TYPE_LAST = TI_FLOAT128X_TYPE,
 690 #define NUM_FLOATNX_TYPES (TI_FLOATNX_TYPE_LAST - TI_FLOATNX_TYPE_FIRST + 1)
 691 #define NUM_FLOATN_NX_TYPES (TI_FLOATN_NX_TYPE_LAST             \
 692                              - TI_FLOATN_NX_TYPE_FIRST          \
 693                              + 1)
 694
 695   /* Type used by certain backends for __float128, which in C++ should be
 696      distinct type from _Float128 for backwards compatibility reasons.  */
 697   TI_FLOAT128T_TYPE,
 698
 699   /* Put the complex types after their component types, so that in (sequential)
 700      tree streaming we can assert that their component types have already been
 701      handled (see tree-streamer.cc:record_common_node).  */
 702   TI_COMPLEX_INTEGER_TYPE,
 703   TI_COMPLEX_FLOAT_TYPE,
 704   TI_COMPLEX_DOUBLE_TYPE,
 705   TI_COMPLEX_LONG_DOUBLE_TYPE,
 706
 707   TI_COMPLEX_FLOAT16_TYPE,
 708   TI_COMPLEX_FLOATN_NX_TYPE_FIRST = TI_COMPLEX_FLOAT16_TYPE,
 709   TI_COMPLEX_FLOAT32_TYPE,
 710   TI_COMPLEX_FLOAT64_TYPE,
 711   TI_COMPLEX_FLOAT128_TYPE,
 712   TI_COMPLEX_FLOAT32X_TYPE,
 713   TI_COMPLEX_FLOAT64X_TYPE,
 714   TI_COMPLEX_FLOAT128X_TYPE,
 715
 716   TI_FLOAT_PTR_TYPE,
 717   TI_DOUBLE_PTR_TYPE,
 718   TI_LONG_DOUBLE_PTR_TYPE,
 719   TI_INTEGER_PTR_TYPE,
 720
 721   TI_VOID_TYPE,
 722   TI_PTR_TYPE,
 723   TI_CONST_PTR_TYPE,
 724   TI_SIZE_TYPE,
 725   TI_PID_TYPE,
 726   TI_PTRDIFF_TYPE,
 727   TI_VA_LIST_TYPE,
 728   TI_VA_LIST_GPR_COUNTER_FIELD,
 729   TI_VA_LIST_FPR_COUNTER_FIELD,
 730   TI_BOOLEAN_TYPE,
 731   TI_FILEPTR_TYPE,
 732   TI_CONST_TM_PTR_TYPE,
 733   TI_FENV_T_PTR_TYPE,
 734   TI_CONST_FENV_T_PTR_TYPE,
 735   TI_FEXCEPT_T_PTR_TYPE,
 736   TI_CONST_FEXCEPT_T_PTR_TYPE,
 737   TI_POINTER_SIZED_TYPE,
 738
 739   TI_DFLOAT32_TYPE,
 740   TI_DFLOAT64_TYPE,
 741   TI_DFLOAT128_TYPE,
 742
 743   TI_VOID_LIST_NODE,
 744
 745   TI_MAIN_IDENTIFIER,
 746
 747   TI_SAT_SFRACT_TYPE,
 748   TI_SAT_FRACT_TYPE,
 749   TI_SAT_LFRACT_TYPE,
 750   TI_SAT_LLFRACT_TYPE,
 751   TI_SAT_USFRACT_TYPE,
 752   TI_SAT_UFRACT_TYPE,
 753   TI_SAT_ULFRACT_TYPE,
 754   TI_SAT_ULLFRACT_TYPE,
 755   TI_SFRACT_TYPE,
 756   TI_FRACT_TYPE,
 757   TI_LFRACT_TYPE,
 758   TI_LLFRACT_TYPE,
 759   TI_USFRACT_TYPE,
 760   TI_UFRACT_TYPE,
 761   TI_ULFRACT_TYPE,
 762   TI_ULLFRACT_TYPE,
 763   TI_SAT_SACCUM_TYPE,
 764   TI_SAT_ACCUM_TYPE,
 765   TI_SAT_LACCUM_TYPE,
 766   TI_SAT_LLACCUM_TYPE,
 767   TI_SAT_USACCUM_TYPE,
 768   TI_SAT_UACCUM_TYPE,
 769   TI_SAT_ULACCUM_TYPE,
 770   TI_SAT_ULLACCUM_TYPE,
 771   TI_SACCUM_TYPE,
 772   TI_ACCUM_TYPE,
 773   TI_LACCUM_TYPE,
 774   TI_LLACCUM_TYPE,
 775   TI_USACCUM_TYPE,
 776   TI_UACCUM_TYPE,
 777   TI_ULACCUM_TYPE,
 778   TI_ULLACCUM_TYPE,
 779   TI_QQ_TYPE,
 780   TI_HQ_TYPE,
 781   TI_SQ_TYPE,
 782   TI_DQ_TYPE,
 783   TI_TQ_TYPE,
 784   TI_UQQ_TYPE,
 785   TI_UHQ_TYPE,
 786   TI_USQ_TYPE,
 787   TI_UDQ_TYPE,
 788   TI_UTQ_TYPE,
 789   TI_SAT_QQ_TYPE,
 790   TI_SAT_HQ_TYPE,
 791   TI_SAT_SQ_TYPE,
 792   TI_SAT_DQ_TYPE,
 793   TI_SAT_TQ_TYPE,
 794   TI_SAT_UQQ_TYPE,
 795   TI_SAT_UHQ_TYPE,
 796   TI_SAT_USQ_TYPE,
 797   TI_SAT_UDQ_TYPE,
 798   TI_SAT_UTQ_TYPE,
 799   TI_HA_TYPE,
 800   TI_SA_TYPE,
 801   TI_DA_TYPE,
 802   TI_TA_TYPE,
 803   TI_UHA_TYPE,
 804   TI_USA_TYPE,
 805   TI_UDA_TYPE,
 806   TI_UTA_TYPE,
 807   TI_SAT_HA_TYPE,
 808   TI_SAT_SA_TYPE,
 809   TI_SAT_DA_TYPE,
 810   TI_SAT_TA_TYPE,
 811   TI_SAT_UHA_TYPE,
 812   TI_SAT_USA_TYPE,
 813   TI_SAT_UDA_TYPE,
 814   TI_SAT_UTA_TYPE,
 815
 816   TI_MODULE_HWM,
 817   /* Nodes below here change during compilation, and should therefore
 818      not be in the C++ module's global tree table.  */
 819
 820   TI_OPTIMIZATION_DEFAULT,
 821   TI_OPTIMIZATION_CURRENT,
 822   TI_TARGET_OPTION_DEFAULT,
 823   TI_TARGET_OPTION_CURRENT,
 824   TI_CURRENT_TARGET_PRAGMA,
 825   TI_CURRENT_OPTIMIZE_PRAGMA,
 826
 827   TI_CHREC_DONT_KNOW,
 828   TI_CHREC_KNOWN,
 829
 830   TI_MAX
 831 };
 832
 833 /* An enumeration of the standard C integer types.  These must be
 834    ordered so that shorter types appear before longer ones, and so
 835    that signed types appear before unsigned ones, for the correct
 836    functioning of interpret_integer() in c-lex.cc.  */
 837 enum integer_type_kind {
 838   itk_char,
 839   itk_signed_char,
 840   itk_unsigned_char,
 841   itk_short,
 842   itk_unsigned_short,
 843   itk_int,
 844   itk_unsigned_int,
 845   itk_long,
 846   itk_unsigned_long,
 847   itk_long_long,
 848   itk_unsigned_long_long,
 849
 850   itk_intN_0,
 851   itk_unsigned_intN_0,
 852   itk_intN_1,
 853   itk_unsigned_intN_1,
 854   itk_intN_2,
 855   itk_unsigned_intN_2,
 856   itk_intN_3,
 857   itk_unsigned_intN_3,
 858
 859   itk_none
 860 };
 861
 862 /* A pointer-to-function member type looks like:
 863
 864      struct {
 865        __P __pfn;
 866        ptrdiff_t __delta;
 867      };
 868
 869    If __pfn is NULL, it is a NULL pointer-to-member-function.
 870
 871    (Because the vtable is always the first thing in the object, we
 872    don't need its offset.)  If the function is virtual, then PFN is
 873    one plus twice the index into the vtable; otherwise, it is just a
 874    pointer to the function.
 875
 876    Unfortunately, using the lowest bit of PFN doesn't work in
 877    architectures that don't impose alignment requirements on function
 878    addresses, or that use the lowest bit to tell one ISA from another,
 879    for example.  For such architectures, we use the lowest bit of
 880    DELTA instead of the lowest bit of the PFN, and DELTA will be
 881    multiplied by 2.  */
 882 enum ptrmemfunc_vbit_where_t {
 883   ptrmemfunc_vbit_in_pfn,
 884   ptrmemfunc_vbit_in_delta
 885 };
 886
 887 /* Flags that may be passed in the third argument of decl_attributes, and
 888    to handler functions for attributes.  */
 889 enum attribute_flags {
 890   /* The type passed in is the type of a DECL, and any attributes that
 891      should be passed in again to be applied to the DECL rather than the
 892      type should be returned.  */
 893   ATTR_FLAG_DECL_NEXT = 1,
 894   /* The type passed in is a function return type, and any attributes that
 895      should be passed in again to be applied to the function type rather
 896      than the return type should be returned.  */
 897   ATTR_FLAG_FUNCTION_NEXT = 2,
 898   /* The type passed in is an array element type, and any attributes that
 899      should be passed in again to be applied to the array type rather
 900      than the element type should be returned.  */
 901   ATTR_FLAG_ARRAY_NEXT = 4,
 902   /* The type passed in is a structure, union or enumeration type being
 903      created, and should be modified in place.  */
 904   ATTR_FLAG_TYPE_IN_PLACE = 8,
 905   /* The attributes are being applied by default to a library function whose
 906      name indicates known behavior, and should be silently ignored if they
 907      are not in fact compatible with the function type.  */
 908   ATTR_FLAG_BUILT_IN = 16,
 909   /* A given attribute has been parsed as a C++-11 attribute.  */
 910   ATTR_FLAG_CXX11 = 32,
 911   /* The attribute handler is being invoked with an internal argument
 912      that may not otherwise be valid when specified in source code.  */
 913   ATTR_FLAG_INTERNAL = 64
 914 };
 915
 916 /* Types used to represent sizes.  */
 917 enum size_type_kind {
 918   stk_sizetype,         /* Normal representation of sizes in bytes.  */
 919   stk_ssizetype,        /* Signed representation of sizes in bytes.  */
 920   stk_bitsizetype,      /* Normal representation of sizes in bits.  */
 921   stk_sbitsizetype,     /* Signed representation of sizes in bits.  */
 922   stk_type_kind_last
 923 };
 924
 925 /* Flags controlling operand_equal_p() behavior.  */
 926 enum operand_equal_flag {
 927   OEP_ONLY_CONST = 1,
 928   OEP_PURE_SAME = 2,
 929   OEP_MATCH_SIDE_EFFECTS = 4,
 930   OEP_ADDRESS_OF = 8,
 931   /* Internal within operand_equal_p:  */
 932   OEP_NO_HASH_CHECK = 16,
 933   /* Internal within inchash::add_expr:  */
 934   OEP_HASH_CHECK = 32,
 935   /* Makes operand_equal_p handle more expressions:  */
 936   OEP_LEXICOGRAPHIC = 64,
 937   OEP_BITWISE = 128,
 938   /* For OEP_ADDRESS_OF of COMPONENT_REFs, only consider same fields as
 939      equivalent rather than also different fields with the same offset.  */
 940   OEP_ADDRESS_OF_SAME_FIELD = 256,
 941   /* In conjunction with OEP_LEXICOGRAPHIC considers names of declarations
 942      of the same kind.  Used to compare VLA bounds involving parameters
 943      across redeclarations of the same function.  */
 944   OEP_DECL_NAME = 512
 945 };
 946
 947 /* Enum and arrays used for tree allocation stats.
 948    Keep in sync with tree.cc:tree_node_kind_names.  */
 949 enum tree_node_kind {
 950   d_kind,
 951   t_kind,
 952   b_kind,
 953   s_kind,
 954   r_kind,
 955   e_kind,
 956   c_kind,
 957   id_kind,
 958   vec_kind,
 959   binfo_kind,
 960   ssa_name_kind,
 961   constr_kind,
 962   x_kind,
 963   lang_decl,
 964   lang_type,
 965   omp_clause_kind,
 966   all_kinds
 967 };
 968
 969 enum annot_expr_kind {
 970   annot_expr_ivdep_kind,
 971   annot_expr_unroll_kind,
 972   annot_expr_no_vector_kind,
 973   annot_expr_vector_kind,
 974   annot_expr_parallel_kind,
 975   annot_expr_kind_last
 976 };
 977
 978 /* The kind of a TREE_CLOBBER_P CONSTRUCTOR node.  */
 979 enum clobber_kind {
 980   /* Unspecified, this clobber acts as a store of an undefined value.  */
 981   CLOBBER_UNDEF,
 982   /* This clobber ends the lifetime of the storage.  */
 983   CLOBBER_EOL,
 984   CLOBBER_LAST
 985 };
 986
 987 /*---------------------------------------------------------------------------
 988                                 Type definitions
 989 ---------------------------------------------------------------------------*/
 990 /* When processing aliases at the symbol table level, we need the
 991    declaration of target. For this reason we need to queue aliases and
 992    process them after all declarations has been produced.  */
 993 struct GTY(()) alias_pair {
 994   tree decl;
 995   tree target;
 996 };
 997
 998 /* An initialization priority.  */
 999 typedef unsigned short priority_type;
1000
1001 /* The type of a callback function for walking over tree structure.  */
1002 typedef tree (*walk_tree_fn) (tree *, int *, void *);
1003
1004 /* The type of a callback function that represents a custom walk_tree.  */
1005 typedef tree (*walk_tree_lh) (tree *, int *, tree (*) (tree *, int *, void *),
1006                               void *, hash_set<tree> *);
1007
1008
1009 /*---------------------------------------------------------------------------
1010                               Main data structures
1011 ---------------------------------------------------------------------------*/
1012 /* A tree node can represent a data type, a variable, an expression
1013    or a statement.  Each node has a TREE_CODE which says what kind of
1014    thing it represents.  Some common codes are:
1015    INTEGER_TYPE -- represents a type of integers.
1016    ARRAY_TYPE -- represents a type of pointer.
1017    VAR_DECL -- represents a declared variable.
1018    INTEGER_CST -- represents a constant integer value.
1019    PLUS_EXPR -- represents a sum (an expression).
1020
1021    As for the contents of a tree node: there are some fields
1022    that all nodes share.  Each TREE_CODE has various special-purpose
1023    fields as well.  The fields of a node are never accessed directly,
1024    always through accessor macros.  */
1025
1026 /* Every kind of tree node starts with this structure,
1027    so all nodes have these fields.
1028
1029    See the accessor macros, defined below, for documentation of the
1030    fields, and the table below which connects the fields and the
1031    accessor macros.  */
1032
1033 struct GTY(()) tree_base {
1034   ENUM_BITFIELD(tree_code) code : 16;
1035
1036   unsigned side_effects_flag : 1;
1037   unsigned constant_flag : 1;
1038   unsigned addressable_flag : 1;
1039   unsigned volatile_flag : 1;
1040   unsigned readonly_flag : 1;
1041   unsigned asm_written_flag: 1;
1042   unsigned nowarning_flag : 1;
1043   unsigned visited : 1;
1044
1045   unsigned used_flag : 1;
1046   unsigned nothrow_flag : 1;
1047   unsigned static_flag : 1;
1048   unsigned public_flag : 1;
1049   unsigned private_flag : 1;
1050   unsigned protected_flag : 1;
1051   unsigned deprecated_flag : 1;
1052   unsigned default_def_flag : 1;
1053
1054   union {
1055     /* The bits in the following structure should only be used with
1056        accessor macros that constrain inputs with tree checking.  */
1057     struct {
1058       unsigned lang_flag_0 : 1;
1059       unsigned lang_flag_1 : 1;
1060       unsigned lang_flag_2 : 1;
1061       unsigned lang_flag_3 : 1;
1062       unsigned lang_flag_4 : 1;
1063       unsigned lang_flag_5 : 1;
1064       unsigned lang_flag_6 : 1;
1065       unsigned saturating_flag : 1;
1066
1067       unsigned unsigned_flag : 1;
1068       unsigned packed_flag : 1;
1069       unsigned user_align : 1;
1070       unsigned nameless_flag : 1;
1071       unsigned atomic_flag : 1;
1072       unsigned unavailable_flag : 1;
1073       unsigned spare0 : 2;
1074
1075       unsigned spare1 : 8;
1076
1077       /* This field is only used with TREE_TYPE nodes; the only reason it is
1078          present in tree_base instead of tree_type is to save space.  The size
1079          of the field must be large enough to hold addr_space_t values.
1080          For CONSTRUCTOR nodes this holds the clobber_kind enum.  */
1081       unsigned address_space : 8;
1082     } bits;
1083
1084     /* The following fields are present in tree_base to save space.  The
1085        nodes using them do not require any of the flags above and so can
1086        make better use of the 4-byte sized word.  */
1087
1088     /* The number of HOST_WIDE_INTs in an INTEGER_CST.  */
1089     struct {
1090       /* The number of HOST_WIDE_INTs if the INTEGER_CST is accessed in
1091          its native precision.  */
1092       unsigned char unextended;
1093
1094       /* The number of HOST_WIDE_INTs if the INTEGER_CST is extended to
1095          wider precisions based on its TYPE_SIGN.  */
1096       unsigned char extended;
1097
1098       /* The number of HOST_WIDE_INTs if the INTEGER_CST is accessed in
1099          offset_int precision, with smaller integers being extended
1100          according to their TYPE_SIGN.  This is equal to one of the two
1101          fields above but is cached for speed.  */
1102       unsigned char offset;
1103     } int_length;
1104
1105     /* VEC length.  This field is only used with TREE_VEC.  */
1106     int length;
1107
1108     /* This field is only used with VECTOR_CST.  */
1109     struct {
1110       /* The value of VECTOR_CST_LOG2_NPATTERNS.  */
1111       unsigned int log2_npatterns : 8;
1112
1113       /* The value of VECTOR_CST_NELTS_PER_PATTERN.  */
1114       unsigned int nelts_per_pattern : 8;
1115
1116       /* For future expansion.  */
1117       unsigned int unused : 16;
1118     } vector_cst;
1119
1120     /* SSA version number.  This field is only used with SSA_NAME.  */
1121     unsigned int version;
1122
1123     /* CHREC_VARIABLE.  This field is only used with POLYNOMIAL_CHREC.  */
1124     unsigned int chrec_var;
1125
1126     /* Internal function code.  */
1127     enum internal_fn ifn;
1128
1129     /* OMP_ATOMIC* memory order.  */
1130     enum omp_memory_order omp_atomic_memory_order;
1131
1132     /* The following two fields are used for MEM_REF and TARGET_MEM_REF
1133        expression trees and specify known data non-dependences.  For
1134        two memory references in a function they are known to not
1135        alias if dependence_info.clique are equal and dependence_info.base
1136        are distinct.  Clique number zero means there is no information,
1137        clique number one is populated from function global information
1138        and thus needs no remapping on transforms like loop unrolling.  */
1139     struct {
1140       unsigned short clique;
1141       unsigned short base;
1142     } dependence_info;
1143   } GTY((skip(""))) u;
1144 };
1145
1146 /* The following table lists the uses of each of the above flags and
1147    for which types of nodes they are defined.
1148
1149    addressable_flag:
1150
1151        TREE_ADDRESSABLE in
1152            VAR_DECL, PARM_DECL, RESULT_DECL, FUNCTION_DECL, LABEL_DECL
1153            SSA_NAME
1154            all types
1155            CONSTRUCTOR, IDENTIFIER_NODE
1156            STMT_EXPR
1157
1158        CALL_EXPR_TAILCALL in
1159            CALL_EXPR
1160
1161        CASE_LOW_SEEN in
1162            CASE_LABEL_EXPR
1163
1164        PREDICT_EXPR_OUTCOME in
1165            PREDICT_EXPR
1166
1167        OMP_CLAUSE_MAP_DECL_MAKE_ADDRESSABLE in
1168            OMP_CLAUSE
1169
1170    static_flag:
1171
1172        TREE_STATIC in
1173            VAR_DECL, FUNCTION_DECL
1174            CONSTRUCTOR
1175
1176        TREE_NO_TRAMPOLINE in
1177            ADDR_EXPR
1178
1179        BINFO_VIRTUAL_P in
1180            TREE_BINFO
1181
1182        TREE_SYMBOL_REFERENCED in
1183            IDENTIFIER_NODE
1184
1185        CLEANUP_EH_ONLY in
1186            TARGET_EXPR, WITH_CLEANUP_EXPR
1187
1188        TRY_CATCH_IS_CLEANUP in
1189            TRY_CATCH_EXPR
1190
1191        ASM_INPUT_P in
1192            ASM_EXPR
1193
1194        TYPE_REF_CAN_ALIAS_ALL in
1195            POINTER_TYPE, REFERENCE_TYPE
1196
1197        CASE_HIGH_SEEN in
1198            CASE_LABEL_EXPR
1199
1200        ENUM_IS_SCOPED in
1201            ENUMERAL_TYPE
1202
1203        TRANSACTION_EXPR_OUTER in
1204            TRANSACTION_EXPR
1205
1206        MUST_TAIL_CALL in
1207            CALL_EXPR
1208
1209    public_flag:
1210
1211        TREE_OVERFLOW in
1212            INTEGER_CST, REAL_CST, COMPLEX_CST, VECTOR_CST
1213
1214        TREE_PUBLIC in
1215            VAR_DECL, FUNCTION_DECL
1216            IDENTIFIER_NODE
1217
1218        CONSTRUCTOR_NO_CLEARING in
1219            CONSTRUCTOR
1220
1221        ASM_VOLATILE_P in
1222            ASM_EXPR
1223
1224        CALL_EXPR_VA_ARG_PACK in
1225            CALL_EXPR
1226
1227        TYPE_CACHED_VALUES_P in
1228            all types
1229
1230        SAVE_EXPR_RESOLVED_P in
1231            SAVE_EXPR
1232
1233        OMP_CLAUSE_LASTPRIVATE_FIRSTPRIVATE in
1234            OMP_CLAUSE_LASTPRIVATE
1235
1236        OMP_CLAUSE_PRIVATE_DEBUG in
1237            OMP_CLAUSE_PRIVATE
1238
1239        OMP_CLAUSE_LINEAR_NO_COPYIN in
1240            OMP_CLAUSE_LINEAR
1241
1242        OMP_CLAUSE_MAP_ZERO_BIAS_ARRAY_SECTION in
1243            OMP_CLAUSE_MAP
1244
1245        OMP_CLAUSE_REDUCTION_OMP_ORIG_REF in
1246            OMP_CLAUSE_{,TASK_,IN_}REDUCTION
1247
1248        OMP_CLAUSE_USE_DEVICE_PTR_IF_PRESENT in
1249            OMP_CLAUSE_USE_DEVICE_PTR
1250
1251        TRANSACTION_EXPR_RELAXED in
1252            TRANSACTION_EXPR
1253
1254        FALLTHROUGH_LABEL_P in
1255            LABEL_DECL
1256
1257        SSA_NAME_IS_VIRTUAL_OPERAND in
1258            SSA_NAME
1259
1260        EXPR_LOCATION_WRAPPER_P in
1261            NON_LVALUE_EXPR, VIEW_CONVERT_EXPR
1262
1263    private_flag:
1264
1265        TREE_PRIVATE in
1266            all decls
1267
1268        CALL_EXPR_RETURN_SLOT_OPT in
1269            CALL_EXPR
1270
1271        OMP_SECTION_LAST in
1272            OMP_SECTION
1273
1274        OMP_PARALLEL_COMBINED in
1275            OMP_PARALLEL
1276
1277        OMP_CLAUSE_PRIVATE_OUTER_REF in
1278            OMP_CLAUSE_PRIVATE
1279
1280        OMP_CLAUSE_LINEAR_NO_COPYOUT in
1281            OMP_CLAUSE_LINEAR
1282
1283        TYPE_REF_IS_RVALUE in
1284            REFERENCE_TYPE
1285
1286        ENUM_IS_OPAQUE in
1287            ENUMERAL_TYPE
1288
1289    protected_flag:
1290
1291        TREE_PROTECTED in
1292            BLOCK
1293            all decls
1294
1295        CALL_FROM_THUNK_P and
1296        CALL_ALLOCA_FOR_VAR_P and
1297        CALL_FROM_NEW_OR_DELETE_P in
1298            CALL_EXPR
1299
1300        OMP_CLAUSE_LINEAR_VARIABLE_STRIDE in
1301            OMP_CLAUSE_LINEAR
1302
1303        ASM_INLINE_P in
1304            ASM_EXPR
1305
1306    side_effects_flag:
1307
1308        TREE_SIDE_EFFECTS in
1309            all expressions
1310            all decls
1311            all constants
1312
1313        FORCED_LABEL in
1314            LABEL_DECL
1315
1316    volatile_flag:
1317
1318        TREE_THIS_VOLATILE in
1319            all expressions
1320            all decls
1321
1322        TYPE_VOLATILE in
1323            all types
1324
1325    readonly_flag:
1326
1327        TREE_READONLY in
1328            all expressions
1329            all decls
1330
1331        TYPE_READONLY in
1332            all types
1333
1334    constant_flag:
1335
1336        TREE_CONSTANT in
1337            all expressions
1338            all decls
1339            all constants
1340
1341        TYPE_SIZES_GIMPLIFIED in
1342            all types
1343
1344    unsigned_flag:
1345
1346        TYPE_UNSIGNED in
1347            all types
1348
1349        DECL_UNSIGNED in
1350            all decls
1351
1352    asm_written_flag:
1353
1354        TREE_ASM_WRITTEN in
1355            VAR_DECL, FUNCTION_DECL, TYPE_DECL
1356            RECORD_TYPE, UNION_TYPE, QUAL_UNION_TYPE
1357            BLOCK, STRING_CST
1358
1359        SSA_NAME_OCCURS_IN_ABNORMAL_PHI in
1360            SSA_NAME
1361
1362    used_flag:
1363
1364        TREE_USED in
1365            all expressions
1366            all decls
1367            IDENTIFIER_NODE
1368
1369    nothrow_flag:
1370
1371        TREE_NOTHROW in
1372            CALL_EXPR
1373            FUNCTION_DECL
1374
1375        TREE_THIS_NOTRAP in
1376           INDIRECT_REF, MEM_REF, TARGET_MEM_REF, ARRAY_REF, ARRAY_RANGE_REF
1377
1378        SSA_NAME_IN_FREE_LIST in
1379           SSA_NAME
1380
1381        DECL_NONALIASED in
1382           VAR_DECL
1383
1384    deprecated_flag:
1385
1386        TREE_DEPRECATED in
1387            all decls
1388            all types
1389
1390        IDENTIFIER_TRANSPARENT_ALIAS in
1391            IDENTIFIER_NODE
1392
1393        SSA_NAME_POINTS_TO_READONLY_MEMORY in
1394            SSA_NAME
1395
1396    unavailable_flag:
1397
1398        TREE_UNAVAILABLE in
1399            all decls
1400            all types
1401
1402    visited:
1403
1404        TREE_VISITED in
1405            all trees (used liberally by many passes)
1406
1407    saturating_flag:
1408
1409        TYPE_REVERSE_STORAGE_ORDER in
1410            RECORD_TYPE, UNION_TYPE, QUAL_UNION_TYPE, ARRAY_TYPE
1411
1412        TYPE_SATURATING in
1413            other types
1414
1415        VAR_DECL_IS_VIRTUAL_OPERAND in
1416            VAR_DECL
1417
1418    nowarning_flag:
1419
1420        TREE_NO_WARNING in
1421            all expressions
1422            all decls
1423
1424        TYPE_ARTIFICIAL in
1425            all types
1426
1427    default_def_flag:
1428
1429        TYPE_FINAL_P in
1430            RECORD_TYPE, UNION_TYPE and QUAL_UNION_TYPE
1431
1432        TYPE_VECTOR_OPAQUE in
1433            VECTOR_TYPE
1434
1435        SSA_NAME_IS_DEFAULT_DEF in
1436            SSA_NAME
1437
1438        DECL_NONLOCAL_FRAME in
1439            VAR_DECL
1440
1441        REF_REVERSE_STORAGE_ORDER in
1442            BIT_FIELD_REF, MEM_REF
1443
1444        FUNC_ADDR_BY_DESCRIPTOR in
1445            ADDR_EXPR
1446
1447        CALL_EXPR_BY_DESCRIPTOR in
1448            CALL_EXPR
1449
1450 */
1451
1452 struct GTY(()) tree_typed {
1453   struct tree_base base;
1454   tree type;
1455 };
1456
1457 struct GTY(()) tree_common {
1458   struct tree_typed typed;
1459   tree chain;
1460 };
1461
1462 struct GTY(()) tree_int_cst {
1463   struct tree_typed typed;
1464   HOST_WIDE_INT val[1];
1465 };
1466
1467
1468 struct GTY(()) tree_real_cst {
1469   struct tree_typed typed;
1470   struct real_value value;
1471 };
1472
1473 struct GTY(()) tree_fixed_cst {
1474   struct tree_typed typed;
1475   struct fixed_value * fixed_cst_ptr;
1476 };
1477
1478 struct GTY(()) tree_string {
1479   struct tree_typed typed;
1480   int length;
1481   char str[1];
1482 };
1483
1484 struct GTY(()) tree_complex {
1485   struct tree_typed typed;
1486   tree real;
1487   tree imag;
1488 };
1489
1490 struct GTY(()) tree_vector {
1491   struct tree_typed typed;
1492   tree GTY ((length ("vector_cst_encoded_nelts ((tree) &%h)"))) elts[1];
1493 };
1494
1495 struct GTY(()) tree_poly_int_cst {
1496   struct tree_typed typed;
1497   tree coeffs[NUM_POLY_INT_COEFFS];
1498 };
1499
1500 struct GTY(()) tree_identifier {
1501   struct tree_common common;
1502   struct ht_identifier id;
1503 };
1504
1505 struct GTY(()) tree_list {
1506   struct tree_common common;
1507   tree purpose;
1508   tree value;
1509 };
1510
1511 struct GTY(()) tree_vec {
1512   struct tree_common common;
1513   tree GTY ((length ("TREE_VEC_LENGTH ((tree)&%h)"))) a[1];
1514 };
1515
1516 /* A single element of a CONSTRUCTOR. VALUE holds the actual value of the
1517    element. INDEX can optionally design the position of VALUE: in arrays,
1518    it is the index where VALUE has to be placed; in structures, it is the
1519    FIELD_DECL of the member.  */
1520 struct GTY(()) constructor_elt {
1521   tree index;
1522   tree value;
1523 };
1524
1525 struct GTY(()) tree_constructor {
1526   struct tree_typed typed;
1527   vec<constructor_elt, va_gc> *elts;
1528 };
1529
1530 enum omp_clause_depend_kind
1531 {
1532   OMP_CLAUSE_DEPEND_IN,
1533   OMP_CLAUSE_DEPEND_OUT,
1534   OMP_CLAUSE_DEPEND_INOUT,
1535   OMP_CLAUSE_DEPEND_MUTEXINOUTSET,
1536   OMP_CLAUSE_DEPEND_INOUTSET,
1537   OMP_CLAUSE_DEPEND_DEPOBJ,
1538   OMP_CLAUSE_DEPEND_INVALID,
1539   OMP_CLAUSE_DEPEND_LAST
1540 };
1541
1542 enum omp_clause_doacross_kind
1543 {
1544   OMP_CLAUSE_DOACROSS_SOURCE,
1545   OMP_CLAUSE_DOACROSS_SINK,
1546   OMP_CLAUSE_DOACROSS_LAST
1547 };
1548
1549 enum omp_clause_proc_bind_kind
1550 {
1551   /* Numbers should match omp_proc_bind_t enum in omp.h.  */
1552   OMP_CLAUSE_PROC_BIND_FALSE = 0,
1553   OMP_CLAUSE_PROC_BIND_TRUE = 1,
1554   OMP_CLAUSE_PROC_BIND_PRIMARY = 2,
1555   OMP_CLAUSE_PROC_BIND_MASTER = 2,
1556   OMP_CLAUSE_PROC_BIND_CLOSE = 3,
1557   OMP_CLAUSE_PROC_BIND_SPREAD = 4,
1558   OMP_CLAUSE_PROC_BIND_LAST
1559 };
1560
1561 enum omp_clause_device_type_kind
1562 {
1563   OMP_CLAUSE_DEVICE_TYPE_HOST = 1,
1564   OMP_CLAUSE_DEVICE_TYPE_NOHOST = 2,
1565   OMP_CLAUSE_DEVICE_TYPE_ANY = 3
1566 };
1567
1568 enum omp_clause_linear_kind
1569 {
1570   OMP_CLAUSE_LINEAR_DEFAULT,
1571   OMP_CLAUSE_LINEAR_REF,
1572   OMP_CLAUSE_LINEAR_VAL,
1573   OMP_CLAUSE_LINEAR_UVAL
1574 };
1575
1576 struct GTY(()) tree_exp {
1577   struct tree_typed typed;
1578   location_t locus;
1579   tree GTY ((length ("TREE_OPERAND_LENGTH ((tree)&%h)"))) operands[1];
1580 };
1581
1582 /* Immediate use linking structure.  This structure is used for maintaining
1583    a doubly linked list of uses of an SSA_NAME.  */
1584 struct GTY(()) ssa_use_operand_t {
1585   struct ssa_use_operand_t* GTY((skip(""))) prev;
1586   struct ssa_use_operand_t* GTY((skip(""))) next;
1587   /* Immediate uses for a given SSA name are maintained as a cyclic
1588      list.  To recognize the root of this list, the location field
1589      needs to point to the original SSA name.  Since statements and
1590      SSA names are of different data types, we need this union.  See
1591      the explanation in struct imm_use_iterator.  */
1592   union { gimple *stmt; tree ssa_name; } GTY((skip(""))) loc;
1593   tree *GTY((skip(""))) use;
1594 };
1595
1596 struct GTY(()) tree_ssa_name {
1597   struct tree_typed typed;
1598
1599   /* _DECL wrapped by this SSA name.  */
1600   tree var;
1601
1602   /* Statement that defines this SSA name.  */
1603   gimple *def_stmt;
1604
1605   /* Value range information.  */
1606   union ssa_name_info_type {
1607     /* Range and aliasing info for pointers.  */
1608     struct GTY ((tag ("0"))) ptr_info_def *ptr_info;
1609     /* Range info for everything else.  */
1610     struct GTY ((tag ("1"))) vrange_storage * range_info;
1611   } GTY ((desc ("%1.typed.type ?" \
1612                 "!POINTER_TYPE_P (TREE_TYPE ((tree)&%1)) : 2"))) info;
1613   /* Immediate uses list for this SSA_NAME.  */
1614   struct ssa_use_operand_t imm_uses;
1615 };
1616
1617 struct GTY(()) phi_arg_d {
1618   /* imm_use MUST be the first element in struct because we do some
1619      pointer arithmetic with it.  See phi_arg_index_from_use.  */
1620   struct ssa_use_operand_t imm_use;
1621   tree def;
1622   location_t locus;
1623 };
1624
1625 struct GTY(()) tree_omp_clause {
1626   struct tree_common common;
1627   location_t locus;
1628   enum omp_clause_code code;
1629   union omp_clause_subcode {
1630     enum omp_clause_default_kind   default_kind;
1631     enum omp_clause_schedule_kind  schedule_kind;
1632     enum omp_clause_depend_kind    depend_kind;
1633     enum omp_clause_doacross_kind  doacross_kind;
1634     /* See include/gomp-constants.h for enum gomp_map_kind's values.  */
1635     unsigned int                   map_kind;
1636     enum omp_clause_proc_bind_kind proc_bind_kind;
1637     enum tree_code                 reduction_code;
1638     enum omp_clause_linear_kind    linear_kind;
1639     enum tree_code                 if_modifier;
1640     enum omp_clause_defaultmap_kind defaultmap_kind;
1641     enum omp_clause_bind_kind      bind_kind;
1642     enum omp_clause_device_type_kind device_type_kind;
1643   } GTY ((skip)) subcode;
1644
1645   /* The gimplification of OMP_CLAUSE_REDUCTION_{INIT,MERGE} for omp-low's
1646      usage.  */
1647   gimple_seq gimple_reduction_init;
1648   gimple_seq gimple_reduction_merge;
1649
1650   tree GTY ((length ("omp_clause_num_ops[OMP_CLAUSE_CODE ((tree)&%h)]")))
1651     ops[1];
1652 };
1653
1654 struct GTY(()) tree_block {
1655   struct tree_base base;
1656   tree chain;
1657
1658   unsigned block_num;
1659
1660   location_t locus;
1661   location_t end_locus;
1662
1663   tree vars;
1664   vec<tree, va_gc> *nonlocalized_vars;
1665
1666   tree subblocks;
1667   tree supercontext;
1668   tree abstract_origin;
1669   tree fragment_origin;
1670   tree fragment_chain;
1671
1672   /* Pointer to the DWARF lexical block.  */
1673   struct die_struct *die;
1674 };
1675
1676 struct GTY(()) tree_type_common {
1677   struct tree_common common;
1678   tree size;
1679   tree size_unit;
1680   tree attributes;
1681   unsigned int uid;
1682
1683   unsigned int precision : 16;
1684   ENUM_BITFIELD(machine_mode) mode : 8;
1685   unsigned lang_flag_0 : 1;
1686   unsigned lang_flag_1 : 1;
1687   unsigned lang_flag_2 : 1;
1688   unsigned lang_flag_3 : 1;
1689   unsigned lang_flag_4 : 1;
1690   unsigned lang_flag_5 : 1;
1691   unsigned lang_flag_6 : 1;
1692   unsigned lang_flag_7 : 1;
1693
1694   /* TYPE_ALIGN in log2; this has to be large enough to hold values
1695      of the maximum of BIGGEST_ALIGNMENT and MAX_OFILE_ALIGNMENT,
1696      the latter being usually the larger.  For ELF it is 8<<28,
1697      so we need to store the value 32 (not 31, as we need the zero
1698      as well), hence six bits.  */
1699   unsigned align : 6;
1700   /* TYPE_STRING_FLAG for INTEGER_TYPE and ARRAY_TYPE.
1701      TYPE_CXX_ODR_P for RECORD_TYPE and UNION_TYPE.  */
1702   unsigned string_flag : 1;
1703   unsigned no_force_blk_flag : 1;
1704
1705   unsigned warn_if_not_align : 6;
1706   unsigned needs_constructing_flag : 1;
1707   unsigned transparent_aggr_flag : 1;
1708
1709   unsigned contains_placeholder_bits : 2;
1710   unsigned restrict_flag : 1;
1711   unsigned typeless_storage : 1;
1712   unsigned empty_flag : 1;
1713   unsigned indivisible_p : 1;
1714   unsigned no_named_args_stdarg_p : 1;
1715   unsigned spare : 9;
1716
1717   alias_set_type alias_set;
1718   tree pointer_to;
1719   tree reference_to;
1720   union tree_type_symtab {
1721     int GTY ((tag ("TYPE_SYMTAB_IS_ADDRESS"))) address;
1722     struct die_struct * GTY ((tag ("TYPE_SYMTAB_IS_DIE"))) die;
1723   } GTY ((desc ("debug_hooks->tree_type_symtab_field"))) symtab;
1724   tree canonical;
1725   tree next_variant;
1726   tree main_variant;
1727   tree context;
1728   tree name;
1729 };
1730
1731 struct GTY(()) tree_type_with_lang_specific {
1732   struct tree_type_common common;
1733   /* Points to a structure whose details depend on the language in use.  */
1734   struct lang_type *lang_specific;
1735 };
1736
1737 struct GTY(()) tree_type_non_common {
1738   struct tree_type_with_lang_specific with_lang_specific;
1739   tree values;
1740   tree minval;
1741   tree maxval;
1742   tree lang_1;
1743 };
1744
1745 struct GTY (()) tree_binfo {
1746   struct tree_common common;
1747
1748   tree offset;
1749   tree vtable;
1750   tree virtuals;
1751   tree vptr_field;
1752   vec<tree, va_gc> *base_accesses;
1753   tree inheritance;
1754
1755   tree vtt_subvtt;
1756   tree vtt_vptr;
1757
1758   vec<tree, va_gc> base_binfos;
1759 };
1760
1761 struct GTY(()) tree_decl_minimal {
1762   struct tree_common common;
1763   location_t locus;
1764   unsigned int uid;
1765   tree name;
1766   tree context;
1767 };
1768
1769 struct GTY(()) tree_decl_common {
1770   struct tree_decl_minimal common;
1771   tree size;
1772
1773   ENUM_BITFIELD(machine_mode) mode : 8;
1774
1775   unsigned nonlocal_flag : 1;
1776   unsigned virtual_flag : 1;
1777   unsigned ignored_flag : 1;
1778   unsigned abstract_flag : 1;
1779   unsigned artificial_flag : 1;
1780   unsigned preserve_flag: 1;
1781   unsigned debug_expr_is_from : 1;
1782
1783   unsigned lang_flag_0 : 1;
1784   unsigned lang_flag_1 : 1;
1785   unsigned lang_flag_2 : 1;
1786   unsigned lang_flag_3 : 1;
1787   unsigned lang_flag_4 : 1;
1788   unsigned lang_flag_5 : 1;
1789   unsigned lang_flag_6 : 1;
1790   unsigned lang_flag_7 : 1;
1791   unsigned lang_flag_8 : 1;
1792
1793   /* In VAR_DECL and PARM_DECL, this is DECL_REGISTER
1794      In TRANSLATION_UNIT_DECL, this is TRANSLATION_UNIT_WARN_EMPTY_P.
1795      In FIELD_DECL, this is DECL_FIELD_ABI_IGNORED.  */
1796   unsigned decl_flag_0 : 1;
1797   /* In FIELD_DECL, this is DECL_BIT_FIELD
1798      In VAR_DECL and FUNCTION_DECL, this is DECL_EXTERNAL.
1799      In TYPE_DECL, this is TYPE_DECL_SUPPRESS_DEBUG.  */
1800   unsigned decl_flag_1 : 1;
1801   /* In FIELD_DECL, this is DECL_NONADDRESSABLE_P
1802      In VAR_DECL, PARM_DECL and RESULT_DECL, this is
1803      DECL_HAS_VALUE_EXPR_P.  */
1804   unsigned decl_flag_2 : 1;
1805   /* In FIELD_DECL, this is DECL_PADDING_P.  */
1806   unsigned decl_flag_3 : 1;
1807   /* Logically, these two would go in a theoretical base shared by var and
1808      parm decl. */
1809   unsigned not_gimple_reg_flag : 1;
1810   /* In VAR_DECL, PARM_DECL and RESULT_DECL, this is DECL_BY_REFERENCE.  */
1811   unsigned decl_by_reference_flag : 1;
1812   /* In a VAR_DECL and PARM_DECL, this is DECL_READ_P.  */
1813   unsigned decl_read_flag : 1;
1814   /* In a VAR_DECL or RESULT_DECL, this is DECL_NONSHAREABLE.  */
1815   /* In a PARM_DECL, this is DECL_HIDDEN_STRING_LENGTH.  */
1816   unsigned decl_nonshareable_flag : 1;
1817
1818   /* DECL_OFFSET_ALIGN, used only for FIELD_DECLs.  */
1819   unsigned int off_align : 6;
1820
1821   /* DECL_ALIGN.  It should have the same size as TYPE_ALIGN.  */
1822   unsigned int align : 6;
1823
1824   /* DECL_WARN_IF_NOT_ALIGN.  It should have the same size as
1825      TYPE_WARN_IF_NOT_ALIGN.  */
1826   unsigned int warn_if_not_align : 6;
1827
1828   /* In FIELD_DECL, this is DECL_NOT_FLEXARRAY.  */
1829   unsigned int decl_not_flexarray : 1;
1830
1831   /* 13 bits unused.  */
1832
1833   /* UID for points-to sets, stable over copying from inlining.  */
1834   unsigned int pt_uid;
1835
1836   tree size_unit;
1837   tree initial;
1838   tree attributes;
1839   tree abstract_origin;
1840
1841   /* Points to a structure whose details depend on the language in use.  */
1842   struct lang_decl *lang_specific;
1843 };
1844
1845 struct GTY(()) tree_decl_with_rtl {
1846   struct tree_decl_common common;
1847   rtx rtl;
1848 };
1849
1850 struct GTY(()) tree_field_decl {
1851   struct tree_decl_common common;
1852
1853   tree offset;
1854   tree bit_field_type;
1855   tree qualifier;
1856   tree bit_offset;
1857   tree fcontext;
1858 };
1859
1860 struct GTY(()) tree_label_decl {
1861   struct tree_decl_with_rtl common;
1862   int label_decl_uid;
1863   int eh_landing_pad_nr;
1864 };
1865
1866 struct GTY(()) tree_result_decl {
1867   struct tree_decl_with_rtl common;
1868 };
1869
1870 struct GTY(()) tree_const_decl {
1871   struct tree_decl_common common;
1872 };
1873
1874 struct GTY(()) tree_parm_decl {
1875   struct tree_decl_with_rtl common;
1876   rtx incoming_rtl;
1877 };
1878
1879 struct GTY(()) tree_decl_with_vis {
1880  struct tree_decl_with_rtl common;
1881  tree assembler_name;
1882  struct symtab_node *symtab_node;
1883
1884  /* Belong to VAR_DECL exclusively.  */
1885  unsigned defer_output : 1;
1886  unsigned hard_register : 1;
1887  unsigned common_flag : 1;
1888  unsigned in_text_section : 1;
1889  unsigned in_constant_pool : 1;
1890  unsigned dllimport_flag : 1;
1891  /* Don't belong to VAR_DECL exclusively.  */
1892  unsigned weak_flag : 1;
1893
1894  unsigned seen_in_bind_expr : 1;
1895  unsigned comdat_flag : 1;
1896  /* Used for FUNCTION_DECL, VAR_DECL and in C++ for TYPE_DECL.  */
1897  ENUM_BITFIELD(symbol_visibility) visibility : 2;
1898  unsigned visibility_specified : 1;
1899
1900  /* Belong to FUNCTION_DECL exclusively.  */
1901  unsigned init_priority_p : 1;
1902  /* Used by C++ only.  Might become a generic decl flag.  */
1903  unsigned shadowed_for_var_p : 1;
1904  /* Belong to FUNCTION_DECL exclusively.  */
1905  unsigned cxx_constructor : 1;
1906  /* Belong to FUNCTION_DECL exclusively.  */
1907  unsigned cxx_destructor : 1;
1908  /* Belong to FUNCTION_DECL exclusively.  */
1909  unsigned final : 1;
1910  /* Belong to FUNCTION_DECL exclusively.  */
1911  unsigned regdecl_flag : 1;
1912  /* 14 unused bits. */
1913  /* 32 more unused on 64 bit HW. */
1914 };
1915
1916 struct GTY(()) tree_var_decl {
1917   struct tree_decl_with_vis common;
1918 };
1919
1920 struct GTY(()) tree_decl_non_common {
1921   struct tree_decl_with_vis common;
1922   /* Almost all FE's use this.  */
1923   tree result;
1924 };
1925
1926 /* Classify a special function declaration type.  */
1927
1928 enum function_decl_type
1929 {
1930   NONE,
1931   OPERATOR_NEW,
1932   OPERATOR_DELETE,
1933   LAMBDA_FUNCTION
1934
1935   /* 0 values left */
1936 };
1937
1938 /* FUNCTION_DECL inherits from DECL_NON_COMMON because of the use of the
1939    arguments/result/saved_tree fields by front ends.   It was either inherit
1940    FUNCTION_DECL from non_common, or inherit non_common from FUNCTION_DECL,
1941    which seemed a bit strange.  */
1942
1943 struct GTY(()) tree_function_decl {
1944   struct tree_decl_non_common common;
1945
1946   struct function *f;
1947
1948   /* Arguments of the function.  */
1949   tree arguments;
1950   /* The personality function. Used for stack unwinding. */
1951   tree personality;
1952
1953   /* Function specific options that are used by this function.  */
1954   tree function_specific_target;        /* target options */
1955   tree function_specific_optimization;  /* optimization options */
1956
1957   /* Generic function body.  */
1958   tree saved_tree;
1959   /* Index within a virtual table.  */
1960   tree vindex;
1961
1962   /* In a FUNCTION_DECL this is DECL_UNCHECKED_FUNCTION_CODE.  */
1963   unsigned int function_code;
1964
1965   ENUM_BITFIELD(built_in_class) built_in_class : 2;
1966   unsigned static_ctor_flag : 1;
1967   unsigned static_dtor_flag : 1;
1968   unsigned uninlinable : 1;
1969   unsigned possibly_inlined : 1;
1970   unsigned novops_flag : 1;
1971   unsigned returns_twice_flag : 1;
1972
1973   unsigned malloc_flag : 1;
1974   unsigned declared_inline_flag : 1;
1975   unsigned no_inline_warning_flag : 1;
1976   unsigned no_instrument_function_entry_exit : 1;
1977   unsigned no_limit_stack : 1;
1978   unsigned disregard_inline_limits : 1;
1979   unsigned pure_flag : 1;
1980   unsigned looping_const_or_pure_flag : 1;
1981
1982   /* Align the bitfield to boundary of a byte.  */
1983   ENUM_BITFIELD(function_decl_type) decl_type: 2;
1984   unsigned has_debug_args_flag : 1;
1985   unsigned versioned_function : 1;
1986   unsigned replaceable_operator : 1;
1987
1988   /* 11 bits left for future expansion.  */
1989   /* 32 bits on 64-bit HW.  */
1990 };
1991
1992 struct GTY(()) tree_translation_unit_decl {
1993   struct tree_decl_common common;
1994   /* Source language of this translation unit.  Used for DWARF output.  */
1995   const char *language;
1996   /* TODO: Non-optimization used to build this translation unit.  */
1997   /* TODO: Root of a partial DWARF tree for global types and decls.  */
1998 };
1999
2000 struct GTY(()) tree_type_decl {
2001   struct tree_decl_non_common common;
2002
2003 };
2004
2005 struct GTY ((chain_next ("%h.next"), chain_prev ("%h.prev"))) tree_statement_list_node
2006  {
2007   struct tree_statement_list_node *prev;
2008   struct tree_statement_list_node *next;
2009   tree stmt;
2010 };
2011
2012 struct GTY(()) tree_statement_list
2013  {
2014   struct tree_typed typed;
2015   struct tree_statement_list_node *head;
2016   struct tree_statement_list_node *tail;
2017 };
2018
2019
2020 /* Optimization options used by a function.  */
2021
2022 struct GTY(()) tree_optimization_option {
2023   struct tree_base base;
2024
2025   /* The optimization options used by the user.  */
2026   struct cl_optimization *opts;
2027
2028   /* Target optabs for this set of optimization options.  This is of
2029      type `struct target_optabs *'.  */
2030   void *GTY ((atomic)) optabs;
2031
2032   /* The value of this_target_optabs against which the optabs above were
2033      generated.  */
2034   struct target_optabs *GTY ((skip)) base_optabs;
2035 };
2036
2037 /* Forward declaration, defined in target-globals.h.  */
2038
2039 class GTY(()) target_globals;
2040
2041 /* Target options used by a function.  */
2042
2043 struct GTY(()) tree_target_option {
2044   struct tree_base base;
2045
2046   /* Target globals for the corresponding target option.  */
2047   class target_globals *globals;
2048
2049   /* The optimization options used by the user.  */
2050   struct cl_target_option *opts;
2051 };
2052
2053 /* Define the overall contents of a tree node.
2054    It may be any of the structures declared above
2055    for various types of node.  */
2056 union GTY ((ptr_alias (union lang_tree_node),
2057             desc ("tree_node_structure (&%h)"), variable_size)) tree_node {
2058   struct tree_base GTY ((tag ("TS_BASE"))) base;
2059   struct tree_typed GTY ((tag ("TS_TYPED"))) typed;
2060   struct tree_common GTY ((tag ("TS_COMMON"))) common;
2061   struct tree_int_cst GTY ((tag ("TS_INT_CST"))) int_cst;
2062   struct tree_poly_int_cst GTY ((tag ("TS_POLY_INT_CST"))) poly_int_cst;
2063   struct tree_real_cst GTY ((tag ("TS_REAL_CST"))) real_cst;
2064   struct tree_fixed_cst GTY ((tag ("TS_FIXED_CST"))) fixed_cst;
2065   struct tree_vector GTY ((tag ("TS_VECTOR"))) vector;
2066   struct tree_string GTY ((tag ("TS_STRING"))) string;
2067   struct tree_complex GTY ((tag ("TS_COMPLEX"))) complex;
2068   struct tree_identifier GTY ((tag ("TS_IDENTIFIER"))) identifier;
2069   struct tree_decl_minimal GTY((tag ("TS_DECL_MINIMAL"))) decl_minimal;
2070   struct tree_decl_common GTY ((tag ("TS_DECL_COMMON"))) decl_common;
2071   struct tree_decl_with_rtl GTY ((tag ("TS_DECL_WRTL"))) decl_with_rtl;
2072   struct tree_decl_non_common  GTY ((tag ("TS_DECL_NON_COMMON")))
2073     decl_non_common;
2074   struct tree_parm_decl  GTY  ((tag ("TS_PARM_DECL"))) parm_decl;
2075   struct tree_decl_with_vis GTY ((tag ("TS_DECL_WITH_VIS"))) decl_with_vis;
2076   struct tree_var_decl GTY ((tag ("TS_VAR_DECL"))) var_decl;
2077   struct tree_field_decl GTY ((tag ("TS_FIELD_DECL"))) field_decl;
2078   struct tree_label_decl GTY ((tag ("TS_LABEL_DECL"))) label_decl;
2079   struct tree_result_decl GTY ((tag ("TS_RESULT_DECL"))) result_decl;
2080   struct tree_const_decl GTY ((tag ("TS_CONST_DECL"))) const_decl;
2081   struct tree_type_decl GTY ((tag ("TS_TYPE_DECL"))) type_decl;
2082   struct tree_function_decl GTY ((tag ("TS_FUNCTION_DECL"))) function_decl;
2083   struct tree_translation_unit_decl GTY ((tag ("TS_TRANSLATION_UNIT_DECL")))
2084     translation_unit_decl;
2085   struct tree_type_common GTY ((tag ("TS_TYPE_COMMON"))) type_common;
2086   struct tree_type_with_lang_specific GTY ((tag ("TS_TYPE_WITH_LANG_SPECIFIC")))
2087     type_with_lang_specific;
2088   struct tree_type_non_common GTY ((tag ("TS_TYPE_NON_COMMON")))
2089     type_non_common;
2090   struct tree_list GTY ((tag ("TS_LIST"))) list;
2091   struct tree_vec GTY ((tag ("TS_VEC"))) vec;
2092   struct tree_exp GTY ((tag ("TS_EXP"))) exp;
2093   struct tree_ssa_name GTY ((tag ("TS_SSA_NAME"))) ssa_name;
2094   struct tree_block GTY ((tag ("TS_BLOCK"))) block;
2095   struct tree_binfo GTY ((tag ("TS_BINFO"))) binfo;
2096   struct tree_statement_list GTY ((tag ("TS_STATEMENT_LIST"))) stmt_list;
2097   struct tree_constructor GTY ((tag ("TS_CONSTRUCTOR"))) constructor;
2098   struct tree_omp_clause GTY ((tag ("TS_OMP_CLAUSE"))) omp_clause;
2099   struct tree_optimization_option GTY ((tag ("TS_OPTIMIZATION"))) optimization;
2100   struct tree_target_option GTY ((tag ("TS_TARGET_OPTION"))) target_option;
2101 };
2102
2103 /* Structure describing an attribute and a function to handle it.  */
2104 struct attribute_spec {
2105   /* The name of the attribute (without any leading or trailing __),
2106      or NULL to mark the end of a table of attributes.  */
2107   const char *name;
2108   /* The minimum length of the list of arguments of the attribute.  */
2109   int min_length;
2110   /* The maximum length of the list of arguments of the attribute
2111      (-1 for no maximum).  It can also be -2 for fake attributes
2112      created for the sake of -Wno-attributes; in that case, we
2113      should skip the balanced token sequence when parsing the attribute.  */
2114   int max_length;
2115   /* Whether this attribute requires a DECL.  If it does, it will be passed
2116      from types of DECLs, function return types and array element types to
2117      the DECLs, function types and array types respectively; but when
2118      applied to a type in any other circumstances, it will be ignored with
2119      a warning.  (If greater control is desired for a given attribute,
2120      this should be false, and the flags argument to the handler may be
2121      used to gain greater control in that case.)  */
2122   bool decl_required;
2123   /* Whether this attribute requires a type.  If it does, it will be passed
2124      from a DECL to the type of that DECL.  */
2125   bool type_required;
2126   /* Whether this attribute requires a function (or method) type.  If it does,
2127      it will be passed from a function pointer type to the target type,
2128      and from a function return type (which is not itself a function
2129      pointer type) to the function type.  */
2130   bool function_type_required;
2131   /* Specifies if attribute affects type's identity.  */
2132   bool affects_type_identity;
2133   /* Function to handle this attribute.  NODE points to a tree[3] array,
2134      where node[0] is the node to which the attribute is to be applied;
2135      node[1] is the last pushed/merged declaration if one exists, and node[2]
2136      may be the declaration for node[0].  If a DECL, it should be modified in
2137      place; if a TYPE, a copy should be created.  NAME is the canonicalized
2138      name of the attribute i.e. without any leading or trailing underscores.
2139      ARGS is the TREE_LIST of the arguments (which may be NULL).  FLAGS gives
2140      further information about the context of the attribute.  Afterwards, the
2141      attributes will be added to the DECL_ATTRIBUTES or TYPE_ATTRIBUTES, as
2142      appropriate, unless *NO_ADD_ATTRS is set to true (which should be done on
2143      error, as well as in any other cases when the attributes should not be
2144      added to the DECL or TYPE).  Depending on FLAGS, any attributes to be
2145      applied to another type or DECL later may be returned;
2146      otherwise the return value should be NULL_TREE.  This pointer may be
2147      NULL if no special handling is required beyond the checks implied
2148      by the rest of this structure.  */
2149   tree (*handler) (tree *node, tree name, tree args,
2150                    int flags, bool *no_add_attrs);
2151
2152   /* Specifies the name of an attribute that's mutually exclusive with
2153      this one, and whether the relationship applies to the function,
2154      variable, or type form of the attribute.  */
2155   struct exclusions {
2156     const char *name;
2157     bool function;
2158     bool variable;
2159     bool type;
2160   };
2161
2162   /* An array of attribute exclusions describing names of other attributes
2163      that this attribute is mutually exclusive with.  */
2164   const exclusions *exclude;
2165 };
2166
2167 /* These functions allow a front-end to perform a manual layout of a
2168    RECORD_TYPE.  (For instance, if the placement of subsequent fields
2169    depends on the placement of fields so far.)  Begin by calling
2170    start_record_layout.  Then, call place_field for each of the
2171    fields.  Then, call finish_record_layout.  See layout_type for the
2172    default way in which these functions are used.  */
2173 typedef struct record_layout_info_s {
2174   /* The RECORD_TYPE that we are laying out.  */
2175   tree t;
2176   /* The offset into the record so far, in bytes, not including bits in
2177      BITPOS.  */
2178   tree offset;
2179   /* The last known alignment of SIZE.  */
2180   unsigned int offset_align;
2181   /* The bit position within the last OFFSET_ALIGN bits, in bits.  */
2182   tree bitpos;
2183   /* The alignment of the record so far, in bits.  */
2184   unsigned int record_align;
2185   /* The alignment of the record so far, ignoring #pragma pack and
2186      __attribute__ ((packed)), in bits.  */
2187   unsigned int unpacked_align;
2188   /* The previous field laid out.  */
2189   tree prev_field;
2190   /* The static variables (i.e., class variables, as opposed to
2191      instance variables) encountered in T.  */
2192   vec<tree, va_gc> *pending_statics;
2193   /* Bits remaining in the current alignment group */
2194   int remaining_in_alignment;
2195   /* True if we've seen a packed field that didn't have normal
2196      alignment anyway.  */
2197   int packed_maybe_necessary;
2198 } *record_layout_info;
2199
2200 /* Iterator for going through the function arguments.  */
2201 struct function_args_iterator {
2202   tree next;                    /* TREE_LIST pointing to the next argument */
2203 };
2204
2205 /* Structures to map from a tree to another tree.  */
2206 struct GTY(()) tree_map_base {
2207   tree from;
2208 };
2209
2210 /* Map from a tree to another tree.  */
2211
2212 struct GTY((for_user)) tree_map {
2213   struct tree_map_base base;
2214   unsigned int hash;
2215   tree to;
2216 };
2217
2218 /* Map from a decl tree to another tree.  */
2219 struct GTY((for_user)) tree_decl_map {
2220   struct tree_map_base base;
2221   tree to;
2222 };
2223
2224 /* Map from a tree to an int.  */
2225 struct GTY((for_user)) tree_int_map {
2226   struct tree_map_base base;
2227   unsigned int to;
2228 };
2229
2230 /* Map from a decl tree to a tree vector.  */
2231 struct GTY((for_user)) tree_vec_map {
2232   struct tree_map_base base;
2233   vec<tree, va_gc> *to;
2234 };
2235
2236 /* Abstract iterators for CALL_EXPRs.  These static inline definitions
2237    have to go towards the end of tree.h so that union tree_node is fully
2238    defined by this point.  */
2239
2240 /* Structure containing iterator state.  */
2241 struct call_expr_arg_iterator {
2242   tree t;       /* the call_expr */
2243   int n;        /* argument count */
2244   int i;        /* next argument index */
2245 };
2246
2247 struct const_call_expr_arg_iterator {
2248   const_tree t; /* the call_expr */
2249   int n;        /* argument count */
2250   int i;        /* next argument index */
2251 };
2252
2253 /* The builtin_info structure holds the FUNCTION_DECL of the standard builtin
2254    function, and flags.  */
2255 struct GTY(()) builtin_info_type {
2256   tree decl;
2257   /* Whether the user can use <xxx> instead of explicitly using calls
2258      to __builtin_<xxx>.  */
2259   unsigned implicit_p : 1;
2260   /* Whether the user has provided a declaration of <xxx>.  */
2261   unsigned declared_p : 1;
2262 };
2263
2264 /* Information about a _FloatN or _FloatNx type that may be
2265    supported.  */
2266 struct floatn_type_info {
2267   /* The number N in the type name.  */
2268   int n;
2269   /* Whether it is an extended type _FloatNx (true) or an interchange
2270      type (false).  */
2271   bool extended;
2272 };
2273
2274
2275 /*---------------------------------------------------------------------------
2276                                 Global variables
2277 ---------------------------------------------------------------------------*/
2278 /* Matrix describing the structures contained in a given tree code.  */
2279 extern bool tree_contains_struct[MAX_TREE_CODES][64];
2280
2281 /* Class of tree given its code.  */
2282 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) TYPE,
2283 #define END_OF_BASE_TREE_CODES tcc_exceptional,
2284
2285 #if __cpp_inline_variables < 201606L
2286 template <int N>
2287 struct tree_code_type_tmpl {
2288   static constexpr enum tree_code_class tree_code_type[] = {
2289 #include "all-tree.def"
2290   };
2291 };
2292
2293 template <int N>
2294 constexpr enum tree_code_class tree_code_type_tmpl<N>::tree_code_type[];
2295 #else
2296 constexpr inline enum tree_code_class tree_code_type[] = {
2297 #include "all-tree.def"
2298 };
2299 #endif
2300
2301 #undef DEFTREECODE
2302 #undef END_OF_BASE_TREE_CODES
2303
2304 /* Each tree code class has an associated string representation.
2305    These must correspond to the tree_code_class entries.  */
2306 extern const char *const tree_code_class_strings[];
2307
2308 /* Number of argument-words in each kind of tree-node.  */
2309
2310 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) LENGTH,
2311 #define END_OF_BASE_TREE_CODES 0,
2312
2313 #if __cpp_inline_variables < 201606L
2314 template <int N>
2315 struct tree_code_length_tmpl {
2316   static constexpr unsigned char tree_code_length[] = {
2317 #include "all-tree.def"
2318   };
2319 };
2320
2321 template <int N>
2322 constexpr unsigned char tree_code_length_tmpl<N>::tree_code_length[];
2323 #else
2324 constexpr inline unsigned char tree_code_length[] = {
2325 #include "all-tree.def"
2326 };
2327 #endif
2328
2329 #undef DEFTREECODE
2330 #undef END_OF_BASE_TREE_CODES
2331
2332 /* Vector of all alias pairs for global symbols.  */
2333 extern GTY(()) vec<alias_pair, va_gc> *alias_pairs;
2334
2335 /* Names of all the built_in classes.  */
2336 extern const char *const built_in_class_names[BUILT_IN_LAST];
2337
2338 /* Names of all the built_in functions.  */
2339 extern const char * built_in_names[(int) END_BUILTINS];
2340
2341 /* Number of operands and names for each OMP_CLAUSE node.  */
2342 extern unsigned const char omp_clause_num_ops[];
2343 extern const char * const omp_clause_code_name[];
2344 extern const char *user_omp_clause_code_name (tree, bool);
2345
2346 /* A vector of all translation-units.  */
2347 extern GTY (()) vec<tree, va_gc> *all_translation_units;
2348
2349 /* Vector of standard trees used by the C compiler.  */
2350 extern GTY(()) tree global_trees[TI_MAX];
2351
2352 /* The standard C integer types.  Use integer_type_kind to index into
2353    this array.  */
2354 extern GTY(()) tree integer_types[itk_none];
2355
2356 /* Types used to represent sizes.  */
2357 extern GTY(()) tree sizetype_tab[(int) stk_type_kind_last];
2358
2359 /* Arrays for keeping track of tree node statistics.  */
2360 extern uint64_t tree_node_counts[];
2361 extern uint64_t tree_node_sizes[];
2362
2363 /* True if we are in gimple form and the actions of the folders need to
2364    be restricted.  False if we are not in gimple form and folding is not
2365    restricted to creating gimple expressions.  */
2366 extern bool in_gimple_form;
2367
2368 /* Functional interface to the builtin functions.  */
2369 extern GTY(()) builtin_info_type builtin_info[(int)END_BUILTINS];
2370
2371 /* If nonzero, an upper limit on alignment of structure fields, in bits,  */
2372 extern unsigned int maximum_field_alignment;
2373
2374 /* Points to the FUNCTION_DECL of the function whose body we are reading.  */
2375 extern GTY(()) tree current_function_decl;
2376
2377 /* Nonzero means a FUNC_BEGIN label was emitted.  */
2378 extern GTY(()) const char * current_function_func_begin_label;
2379
2380 /* Information about the _FloatN and _FloatNx types.  */
2381 extern const floatn_type_info floatn_nx_types[NUM_FLOATN_NX_TYPES];
2382
2383 #endif  // GCC_TREE_CORE_H