gcc/tree-core.h

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