gcc/tree-streamer-out.c

   1 /* Routines for emitting trees to a file stream.
   2
   3    Copyright (C) 2011-2014 Free Software Foundation, Inc.
   4    Contributed by Diego Novillo <dnovillo@google.com>
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 3, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 #include "config.h"
  23 #include "system.h"
  24 #include "coretypes.h"
  25 #include "tm.h"
  26 #include "diagnostic.h"
  27 #include "tree.h"
  28 #include "stor-layout.h"
  29 #include "predict.h"
  30 #include "vec.h"
  31 #include "hashtab.h"
  32 #include "hash-set.h"
  33 #include "machmode.h"
  34 #include "hard-reg-set.h"
  35 #include "input.h"
  36 #include "function.h"
  37 #include "basic-block.h"
  38 #include "tree-ssa-alias.h"
  39 #include "internal-fn.h"
  40 #include "gimple-expr.h"
  41 #include "is-a.h"
  42 #include "gimple.h"
  43 #include "hash-map.h"
  44 #include "plugin-api.h"
  45 #include "ipa-ref.h"
  46 #include "cgraph.h"
  47 #include "tree-streamer.h"
  48 #include "data-streamer.h"
  49 #include "streamer-hooks.h"
  50
  51 /* Output the STRING constant to the string
  52    table in OB.  Then put the index onto the INDEX_STREAM.  */
  53
  54 void
  55 streamer_write_string_cst (struct output_block *ob,
  56                            struct lto_output_stream *index_stream,
  57                            tree string)
  58 {
  59   streamer_write_string_with_length (ob, index_stream,
  60                                      string ? TREE_STRING_POINTER (string)
  61                                             : NULL,
  62                                      string ? TREE_STRING_LENGTH (string) : 0,
  63                                      true);
  64 }
  65
  66
  67 /* Output the identifier ID to the string
  68    table in OB.  Then put the index onto the INDEX_STREAM.  */
  69
  70 static void
  71 write_identifier (struct output_block *ob,
  72                    struct lto_output_stream *index_stream,
  73                    tree id)
  74 {
  75   streamer_write_string_with_length (ob, index_stream,
  76                                      IDENTIFIER_POINTER (id),
  77                                      IDENTIFIER_LENGTH (id),
  78                                      true);
  79 }
  80
  81
  82 /* Pack all the non-pointer fields of the TS_BASE structure of
  83    expression EXPR into bitpack BP.  */
  84
  85 static void
  86 pack_ts_base_value_fields (struct bitpack_d *bp, tree expr)
  87 {
  88   bp_pack_value (bp, TREE_CODE (expr), 16);
  89   if (!TYPE_P (expr))
  90     {
  91       bp_pack_value (bp, TREE_SIDE_EFFECTS (expr), 1);
  92       bp_pack_value (bp, TREE_CONSTANT (expr), 1);
  93       bp_pack_value (bp, TREE_READONLY (expr), 1);
  94
  95       /* TREE_PUBLIC is used on types to indicate that the type
  96          has a TYPE_CACHED_VALUES vector.  This is not streamed out,
  97          so we skip it here.  */
  98       bp_pack_value (bp, TREE_PUBLIC (expr), 1);
  99     }
 100   else
 101     bp_pack_value (bp, 0, 4);
 102   bp_pack_value (bp, TREE_ADDRESSABLE (expr), 1);
 103   bp_pack_value (bp, TREE_THIS_VOLATILE (expr), 1);
 104   if (DECL_P (expr))
 105     bp_pack_value (bp, DECL_UNSIGNED (expr), 1);
 106   else if (TYPE_P (expr))
 107     bp_pack_value (bp, TYPE_UNSIGNED (expr), 1);
 108   else
 109     bp_pack_value (bp, 0, 1);
 110   /* We write debug info two times, do not confuse the second one.
 111      The only relevant TREE_ASM_WRITTEN use is on SSA names.  */
 112   bp_pack_value (bp, (TREE_CODE (expr) != SSA_NAME
 113                       ? 0 : TREE_ASM_WRITTEN (expr)), 1);
 114   if (TYPE_P (expr))
 115     bp_pack_value (bp, TYPE_ARTIFICIAL (expr), 1);
 116   else
 117     bp_pack_value (bp, TREE_NO_WARNING (expr), 1);
 118   bp_pack_value (bp, TREE_NOTHROW (expr), 1);
 119   bp_pack_value (bp, TREE_STATIC (expr), 1);
 120   if (TREE_CODE (expr) != TREE_BINFO)
 121     bp_pack_value (bp, TREE_PRIVATE (expr), 1);
 122   bp_pack_value (bp, TREE_PROTECTED (expr), 1);
 123   bp_pack_value (bp, TREE_DEPRECATED (expr), 1);
 124   if (TYPE_P (expr))
 125     {
 126       bp_pack_value (bp, TYPE_SATURATING (expr), 1);
 127       bp_pack_value (bp, TYPE_ADDR_SPACE (expr), 8);
 128     }
 129   else if (TREE_CODE (expr) == SSA_NAME)
 130     bp_pack_value (bp, SSA_NAME_IS_DEFAULT_DEF (expr), 1);
 131   else
 132     bp_pack_value (bp, 0, 1);
 133 }
 134
 135
 136 /* Pack all the non-pointer fields of the TS_INTEGER_CST structure of
 137    expression EXPR into bitpack BP.  */
 138
 139 static void
 140 pack_ts_int_cst_value_fields (struct bitpack_d *bp, tree expr)
 141 {
 142   int i;
 143   /* Note that the number of elements has already been written out in
 144      streamer_write_tree_header.  */
 145   for (i = 0; i < TREE_INT_CST_EXT_NUNITS (expr); i++)
 146     bp_pack_var_len_int (bp, TREE_INT_CST_ELT (expr, i));
 147 }
 148
 149
 150 /* Pack all the non-pointer fields of the TS_REAL_CST structure of
 151    expression EXPR into bitpack BP.  */
 152
 153 static void
 154 pack_ts_real_cst_value_fields (struct bitpack_d *bp, tree expr)
 155 {
 156   unsigned i;
 157   REAL_VALUE_TYPE r;
 158
 159   r = TREE_REAL_CST (expr);
 160   bp_pack_value (bp, r.cl, 2);
 161   bp_pack_value (bp, r.decimal, 1);
 162   bp_pack_value (bp, r.sign, 1);
 163   bp_pack_value (bp, r.signalling, 1);
 164   bp_pack_value (bp, r.canonical, 1);
 165   bp_pack_value (bp, r.uexp, EXP_BITS);
 166   for (i = 0; i < SIGSZ; i++)
 167     bp_pack_value (bp, r.sig[i], HOST_BITS_PER_LONG);
 168 }
 169
 170
 171 /* Pack all the non-pointer fields of the TS_FIXED_CST structure of
 172    expression EXPR into bitpack BP.  */
 173
 174 static void
 175 pack_ts_fixed_cst_value_fields (struct bitpack_d *bp, tree expr)
 176 {
 177   struct fixed_value fv = TREE_FIXED_CST (expr);
 178   bp_pack_enum (bp, machine_mode, MAX_MACHINE_MODE, fv.mode);
 179   bp_pack_var_len_int (bp, fv.data.low);
 180   bp_pack_var_len_int (bp, fv.data.high);
 181 }
 182
 183 /* Pack all the non-pointer fields of the TS_DECL_COMMON structure
 184    of expression EXPR into bitpack BP.  */
 185
 186 static void
 187 pack_ts_decl_common_value_fields (struct bitpack_d *bp, tree expr)
 188 {
 189   bp_pack_enum (bp, machine_mode, MAX_MACHINE_MODE, DECL_MODE (expr));
 190   bp_pack_value (bp, DECL_NONLOCAL (expr), 1);
 191   bp_pack_value (bp, DECL_VIRTUAL_P (expr), 1);
 192   bp_pack_value (bp, DECL_IGNORED_P (expr), 1);
 193   bp_pack_value (bp, DECL_ABSTRACT_P (expr), 1);
 194   bp_pack_value (bp, DECL_ARTIFICIAL (expr), 1);
 195   bp_pack_value (bp, DECL_USER_ALIGN (expr), 1);
 196   bp_pack_value (bp, DECL_PRESERVE_P (expr), 1);
 197   bp_pack_value (bp, DECL_EXTERNAL (expr), 1);
 198   bp_pack_value (bp, DECL_GIMPLE_REG_P (expr), 1);
 199   bp_pack_var_len_unsigned (bp, DECL_ALIGN (expr));
 200
 201   if (TREE_CODE (expr) == LABEL_DECL)
 202     {
 203       /* Note that we do not write LABEL_DECL_UID.  The reader will
 204          always assume an initial value of -1 so that the
 205          label_to_block_map is recreated by gimple_set_bb.  */
 206       bp_pack_var_len_unsigned (bp, EH_LANDING_PAD_NR (expr));
 207     }
 208
 209   if (TREE_CODE (expr) == FIELD_DECL)
 210     {
 211       bp_pack_value (bp, DECL_PACKED (expr), 1);
 212       bp_pack_value (bp, DECL_NONADDRESSABLE_P (expr), 1);
 213       bp_pack_value (bp, expr->decl_common.off_align, 8);
 214     }
 215
 216   if (TREE_CODE (expr) == VAR_DECL)
 217     {
 218       bp_pack_value (bp, DECL_HAS_DEBUG_EXPR_P (expr), 1);
 219       bp_pack_value (bp, DECL_NONLOCAL_FRAME (expr), 1);
 220     }
 221
 222   if (TREE_CODE (expr) == RESULT_DECL
 223       || TREE_CODE (expr) == PARM_DECL
 224       || TREE_CODE (expr) == VAR_DECL)
 225     {
 226       bp_pack_value (bp, DECL_BY_REFERENCE (expr), 1);
 227       if (TREE_CODE (expr) == VAR_DECL
 228           || TREE_CODE (expr) == PARM_DECL)
 229         bp_pack_value (bp, DECL_HAS_VALUE_EXPR_P (expr), 1);
 230     }
 231 }
 232
 233
 234 /* Pack all the non-pointer fields of the TS_DECL_WRTL structure
 235    of expression EXPR into bitpack BP.  */
 236
 237 static void
 238 pack_ts_decl_wrtl_value_fields (struct bitpack_d *bp, tree expr)
 239 {
 240   bp_pack_value (bp, DECL_REGISTER (expr), 1);
 241 }
 242
 243
 244 /* Pack all the non-pointer fields of the TS_DECL_WITH_VIS structure
 245    of expression EXPR into bitpack BP.  */
 246
 247 static void
 248 pack_ts_decl_with_vis_value_fields (struct bitpack_d *bp, tree expr)
 249 {
 250   bp_pack_value (bp, DECL_COMMON (expr), 1);
 251   bp_pack_value (bp, DECL_DLLIMPORT_P (expr), 1);
 252   bp_pack_value (bp, DECL_WEAK (expr), 1);
 253   bp_pack_value (bp, DECL_SEEN_IN_BIND_EXPR_P (expr),  1);
 254   bp_pack_value (bp, DECL_COMDAT (expr),  1);
 255   bp_pack_value (bp, DECL_VISIBILITY (expr),  2);
 256   bp_pack_value (bp, DECL_VISIBILITY_SPECIFIED (expr),  1);
 257
 258   if (TREE_CODE (expr) == VAR_DECL)
 259     {
 260       bp_pack_value (bp, DECL_HARD_REGISTER (expr), 1);
 261       /* DECL_IN_TEXT_SECTION is set during final asm output only. */
 262       bp_pack_value (bp, DECL_IN_CONSTANT_POOL (expr), 1);
 263     }
 264
 265   if (TREE_CODE (expr) == FUNCTION_DECL)
 266     {
 267       bp_pack_value (bp, DECL_FINAL_P (expr), 1);
 268       bp_pack_value (bp, DECL_CXX_CONSTRUCTOR_P (expr), 1);
 269       bp_pack_value (bp, DECL_CXX_DESTRUCTOR_P (expr), 1);
 270     }
 271 }
 272
 273
 274 /* Pack all the non-pointer fields of the TS_FUNCTION_DECL structure
 275    of expression EXPR into bitpack BP.  */
 276
 277 static void
 278 pack_ts_function_decl_value_fields (struct bitpack_d *bp, tree expr)
 279 {
 280   /* For normal/md builtins we only write the class and code, so they
 281      should never be handled here.  */
 282   gcc_assert (!streamer_handle_as_builtin_p (expr));
 283
 284   bp_pack_enum (bp, built_in_class, BUILT_IN_LAST,
 285                 DECL_BUILT_IN_CLASS (expr));
 286   bp_pack_value (bp, DECL_STATIC_CONSTRUCTOR (expr), 1);
 287   bp_pack_value (bp, DECL_STATIC_DESTRUCTOR (expr), 1);
 288   bp_pack_value (bp, DECL_UNINLINABLE (expr), 1);
 289   bp_pack_value (bp, DECL_POSSIBLY_INLINED (expr), 1);
 290   bp_pack_value (bp, DECL_IS_NOVOPS (expr), 1);
 291   bp_pack_value (bp, DECL_IS_RETURNS_TWICE (expr), 1);
 292   bp_pack_value (bp, DECL_IS_MALLOC (expr), 1);
 293   bp_pack_value (bp, DECL_IS_OPERATOR_NEW (expr), 1);
 294   bp_pack_value (bp, DECL_DECLARED_INLINE_P (expr), 1);
 295   bp_pack_value (bp, DECL_STATIC_CHAIN (expr), 1);
 296   bp_pack_value (bp, DECL_NO_INLINE_WARNING_P (expr), 1);
 297   bp_pack_value (bp, DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (expr), 1);
 298   bp_pack_value (bp, DECL_NO_LIMIT_STACK (expr), 1);
 299   bp_pack_value (bp, DECL_DISREGARD_INLINE_LIMITS (expr), 1);
 300   bp_pack_value (bp, DECL_PURE_P (expr), 1);
 301   bp_pack_value (bp, DECL_LOOPING_CONST_OR_PURE_P (expr), 1);
 302   if (DECL_BUILT_IN_CLASS (expr) != NOT_BUILT_IN)
 303     bp_pack_value (bp, DECL_FUNCTION_CODE (expr), 11);
 304 }
 305
 306
 307 /* Pack all the non-pointer fields of the TS_TYPE_COMMON structure
 308    of expression EXPR into bitpack BP.  */
 309
 310 static void
 311 pack_ts_type_common_value_fields (struct bitpack_d *bp, tree expr)
 312 {
 313   bp_pack_enum (bp, machine_mode, MAX_MACHINE_MODE, TYPE_MODE (expr));
 314   bp_pack_value (bp, TYPE_STRING_FLAG (expr), 1);
 315   bp_pack_value (bp, TYPE_NO_FORCE_BLK (expr), 1);
 316   bp_pack_value (bp, TYPE_NEEDS_CONSTRUCTING (expr), 1);
 317   if (RECORD_OR_UNION_TYPE_P (expr))
 318     {
 319       bp_pack_value (bp, TYPE_TRANSPARENT_AGGR (expr), 1);
 320       bp_pack_value (bp, TYPE_FINAL_P (expr), 1);
 321     }
 322   else if (TREE_CODE (expr) == ARRAY_TYPE)
 323     bp_pack_value (bp, TYPE_NONALIASED_COMPONENT (expr), 1);
 324   bp_pack_value (bp, TYPE_PACKED (expr), 1);
 325   bp_pack_value (bp, TYPE_RESTRICT (expr), 1);
 326   bp_pack_value (bp, TYPE_USER_ALIGN (expr), 1);
 327   bp_pack_value (bp, TYPE_READONLY (expr), 1);
 328   bp_pack_var_len_unsigned (bp, TYPE_PRECISION (expr));
 329   bp_pack_var_len_unsigned (bp, TYPE_ALIGN (expr));
 330   /* Make sure to preserve the fact whether the frontend would assign
 331      alias-set zero to this type.  */
 332   bp_pack_var_len_int (bp, (TYPE_ALIAS_SET (expr) == 0
 333                             || (!in_lto_p
 334                                 && get_alias_set (expr) == 0)) ? 0 : -1);
 335 }
 336
 337
 338 /* Pack all the non-pointer fields of the TS_BLOCK structure
 339    of expression EXPR into bitpack BP.  */
 340
 341 static void
 342 pack_ts_block_value_fields (struct output_block *ob,
 343                             struct bitpack_d *bp, tree expr)
 344 {
 345   bp_pack_value (bp, BLOCK_ABSTRACT (expr), 1);
 346   /* BLOCK_NUMBER is recomputed.  */
 347   /* Stream BLOCK_SOURCE_LOCATION for the limited cases we can handle - those
 348      that represent inlined function scopes.
 349      For the rest them on the floor instead of ICEing in dwarf2out.c.  */
 350   if (inlined_function_outer_scope_p (expr))
 351     stream_output_location (ob, bp, BLOCK_SOURCE_LOCATION (expr));
 352   else
 353     stream_output_location (ob, bp, UNKNOWN_LOCATION);
 354 }
 355
 356 /* Pack all the non-pointer fields of the TS_TRANSLATION_UNIT_DECL structure
 357    of expression EXPR into bitpack BP.  */
 358
 359 static void
 360 pack_ts_translation_unit_decl_value_fields (struct output_block *ob,
 361                                             struct bitpack_d *bp, tree expr)
 362 {
 363   bp_pack_string (ob, bp, TRANSLATION_UNIT_LANGUAGE (expr), true);
 364 }
 365
 366
 367 /* Pack all the non-pointer fields of the TS_OMP_CLAUSE structure
 368    of expression EXPR into bitpack BP.  */
 369
 370 static void
 371 pack_ts_omp_clause_value_fields (struct output_block *ob,
 372                                  struct bitpack_d *bp, tree expr)
 373 {
 374   stream_output_location (ob, bp, OMP_CLAUSE_LOCATION (expr));
 375   switch (OMP_CLAUSE_CODE (expr))
 376     {
 377     case OMP_CLAUSE_DEFAULT:
 378       bp_pack_enum (bp, omp_clause_default_kind, OMP_CLAUSE_DEFAULT_LAST,
 379                     OMP_CLAUSE_DEFAULT_KIND (expr));
 380       break;
 381     case OMP_CLAUSE_SCHEDULE:
 382       bp_pack_enum (bp, omp_clause_schedule_kind, OMP_CLAUSE_SCHEDULE_LAST,
 383                     OMP_CLAUSE_SCHEDULE_KIND (expr));
 384       break;
 385     case OMP_CLAUSE_DEPEND:
 386       bp_pack_enum (bp, omp_clause_depend_kind, OMP_CLAUSE_DEPEND_LAST,
 387                     OMP_CLAUSE_DEPEND_KIND (expr));
 388       break;
 389     case OMP_CLAUSE_MAP:
 390       bp_pack_enum (bp, omp_clause_map_kind, OMP_CLAUSE_MAP_LAST,
 391                     OMP_CLAUSE_MAP_KIND (expr));
 392       break;
 393     case OMP_CLAUSE_PROC_BIND:
 394       bp_pack_enum (bp, omp_clause_proc_bind_kind, OMP_CLAUSE_PROC_BIND_LAST,
 395                     OMP_CLAUSE_PROC_BIND_KIND (expr));
 396       break;
 397     case OMP_CLAUSE_REDUCTION:
 398       bp_pack_enum (bp, tree_code, MAX_TREE_CODES,
 399                     OMP_CLAUSE_REDUCTION_CODE (expr));
 400       break;
 401     default:
 402       break;
 403     }
 404 }
 405
 406
 407 /* Pack all the bitfields in EXPR into a bit pack.  */
 408
 409 void
 410 streamer_pack_tree_bitfields (struct output_block *ob,
 411                               struct bitpack_d *bp, tree expr)
 412 {
 413   enum tree_code code;
 414
 415   code = TREE_CODE (expr);
 416
 417   /* Note that all these functions are highly sensitive to changes in
 418      the types and sizes of each of the fields being packed.  */
 419   pack_ts_base_value_fields (bp, expr);
 420
 421   if (CODE_CONTAINS_STRUCT (code, TS_INT_CST))
 422     pack_ts_int_cst_value_fields (bp, expr);
 423
 424   if (CODE_CONTAINS_STRUCT (code, TS_REAL_CST))
 425     pack_ts_real_cst_value_fields (bp, expr);
 426
 427   if (CODE_CONTAINS_STRUCT (code, TS_FIXED_CST))
 428     pack_ts_fixed_cst_value_fields (bp, expr);
 429
 430   if (CODE_CONTAINS_STRUCT (code, TS_DECL_MINIMAL))
 431     stream_output_location (ob, bp, DECL_SOURCE_LOCATION (expr));
 432
 433   if (CODE_CONTAINS_STRUCT (code, TS_DECL_COMMON))
 434     pack_ts_decl_common_value_fields (bp, expr);
 435
 436   if (CODE_CONTAINS_STRUCT (code, TS_DECL_WRTL))
 437     pack_ts_decl_wrtl_value_fields (bp, expr);
 438
 439   if (CODE_CONTAINS_STRUCT (code, TS_DECL_WITH_VIS))
 440     pack_ts_decl_with_vis_value_fields (bp, expr);
 441
 442   if (CODE_CONTAINS_STRUCT (code, TS_FUNCTION_DECL))
 443     pack_ts_function_decl_value_fields (bp, expr);
 444
 445   if (CODE_CONTAINS_STRUCT (code, TS_TYPE_COMMON))
 446     pack_ts_type_common_value_fields (bp, expr);
 447
 448   if (CODE_CONTAINS_STRUCT (code, TS_EXP))
 449     stream_output_location (ob, bp, EXPR_LOCATION (expr));
 450
 451   if (CODE_CONTAINS_STRUCT (code, TS_BLOCK))
 452     pack_ts_block_value_fields (ob, bp, expr);
 453
 454   if (CODE_CONTAINS_STRUCT (code, TS_TRANSLATION_UNIT_DECL))
 455     pack_ts_translation_unit_decl_value_fields (ob, bp, expr);
 456
 457   if (CODE_CONTAINS_STRUCT (code, TS_OPTIMIZATION))
 458     cl_optimization_stream_out (bp, TREE_OPTIMIZATION (expr));
 459
 460   if (CODE_CONTAINS_STRUCT (code, TS_BINFO))
 461     bp_pack_var_len_unsigned (bp, vec_safe_length (BINFO_BASE_ACCESSES (expr)));
 462
 463   if (CODE_CONTAINS_STRUCT (code, TS_CONSTRUCTOR))
 464     bp_pack_var_len_unsigned (bp, CONSTRUCTOR_NELTS (expr));
 465
 466   if (CODE_CONTAINS_STRUCT (code, TS_TARGET_OPTION))
 467     cl_target_option_stream_out (ob, bp, TREE_TARGET_OPTION (expr));
 468
 469   if (code == OMP_CLAUSE)
 470     pack_ts_omp_clause_value_fields (ob, bp, expr);
 471 }
 472
 473
 474 /* Write the code and class of builtin EXPR to output block OB.  IX is
 475    the index into the streamer cache where EXPR is stored.*/
 476
 477 void
 478 streamer_write_builtin (struct output_block *ob, tree expr)
 479 {
 480   gcc_assert (streamer_handle_as_builtin_p (expr));
 481
 482   if (DECL_BUILT_IN_CLASS (expr) == BUILT_IN_MD
 483       && !targetm.builtin_decl)
 484     sorry ("tree bytecode streams do not support machine specific builtin "
 485            "functions on this target");
 486
 487   streamer_write_record_start (ob, LTO_builtin_decl);
 488   streamer_write_enum (ob->main_stream, built_in_class, BUILT_IN_LAST,
 489                        DECL_BUILT_IN_CLASS (expr));
 490   streamer_write_uhwi (ob, DECL_FUNCTION_CODE (expr));
 491
 492   if (DECL_ASSEMBLER_NAME_SET_P (expr))
 493     {
 494       /* When the assembler name of a builtin gets a user name,
 495          the new name is always prefixed with '*' by
 496          set_builtin_user_assembler_name.  So, to prevent the
 497          reader side from adding a second '*', we omit it here.  */
 498       const char *str = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (expr));
 499       if (strlen (str) > 1 && str[0] == '*')
 500         streamer_write_string (ob, ob->main_stream, &str[1], true);
 501       else
 502         streamer_write_string (ob, ob->main_stream, NULL, true);
 503     }
 504   else
 505     streamer_write_string (ob, ob->main_stream, NULL, true);
 506 }
 507
 508
 509 /* Emit the chain of tree nodes starting at T.  OB is the output block
 510    to write to.  REF_P is true if chain elements should be emitted
 511    as references.  */
 512
 513 void
 514 streamer_write_chain (struct output_block *ob, tree t, bool ref_p)
 515 {
 516   while (t)
 517     {
 518       /* We avoid outputting external vars or functions by reference
 519          to the global decls section as we do not want to have them
 520          enter decl merging.  This is, of course, only for the call
 521          for streaming BLOCK_VARS, but other callers are safe.
 522          See also lto-streamer-out.c:DFS_write_tree_body.  */
 523       if (VAR_OR_FUNCTION_DECL_P (t)
 524           && DECL_EXTERNAL (t))
 525         stream_write_tree_shallow_non_ref (ob, t, ref_p);
 526       else
 527         stream_write_tree (ob, t, ref_p);
 528
 529       t = TREE_CHAIN (t);
 530     }
 531
 532   /* Write a sentinel to terminate the chain.  */
 533   stream_write_tree (ob, NULL_TREE, ref_p);
 534 }
 535
 536
 537 /* Write all pointer fields in the TS_COMMON structure of EXPR to output
 538    block OB.  If REF_P is true, write a reference to EXPR's pointer
 539    fields.  */
 540
 541 static void
 542 write_ts_common_tree_pointers (struct output_block *ob, tree expr, bool ref_p)
 543 {
 544   if (TREE_CODE (expr) != IDENTIFIER_NODE)
 545     stream_write_tree (ob, TREE_TYPE (expr), ref_p);
 546 }
 547
 548
 549 /* Write all pointer fields in the TS_VECTOR structure of EXPR to output
 550    block OB.  If REF_P is true, write a reference to EXPR's pointer
 551    fields.  */
 552
 553 static void
 554 write_ts_vector_tree_pointers (struct output_block *ob, tree expr, bool ref_p)
 555 {
 556   unsigned i;
 557   /* Note that the number of elements for EXPR has already been emitted
 558      in EXPR's header (see streamer_write_tree_header).  */
 559   for (i = 0; i < VECTOR_CST_NELTS (expr); ++i)
 560     stream_write_tree (ob, VECTOR_CST_ELT (expr, i), ref_p);
 561 }
 562
 563
 564 /* Write all pointer fields in the TS_COMPLEX structure of EXPR to output
 565    block OB.  If REF_P is true, write a reference to EXPR's pointer
 566    fields.  */
 567
 568 static void
 569 write_ts_complex_tree_pointers (struct output_block *ob, tree expr, bool ref_p)
 570 {
 571   stream_write_tree (ob, TREE_REALPART (expr), ref_p);
 572   stream_write_tree (ob, TREE_IMAGPART (expr), ref_p);
 573 }
 574
 575
 576 /* Write all pointer fields in the TS_DECL_MINIMAL structure of EXPR
 577    to output block OB.  If REF_P is true, write a reference to EXPR's
 578    pointer fields.  */
 579
 580 static void
 581 write_ts_decl_minimal_tree_pointers (struct output_block *ob, tree expr,
 582                                      bool ref_p)
 583 {
 584   /* Drop names that were created for anonymous entities.  */
 585   if (DECL_NAME (expr)
 586       && TREE_CODE (DECL_NAME (expr)) == IDENTIFIER_NODE
 587       && ANON_AGGRNAME_P (DECL_NAME (expr)))
 588     stream_write_tree (ob, NULL_TREE, ref_p);
 589   else
 590     stream_write_tree (ob, DECL_NAME (expr), ref_p);
 591   stream_write_tree (ob, DECL_CONTEXT (expr), ref_p);
 592 }
 593
 594
 595 /* Write all pointer fields in the TS_DECL_COMMON structure of EXPR to
 596    output block OB.  If REF_P is true, write a reference to EXPR's
 597    pointer fields.  */
 598
 599 static void
 600 write_ts_decl_common_tree_pointers (struct output_block *ob, tree expr,
 601                                     bool ref_p)
 602 {
 603   stream_write_tree (ob, DECL_SIZE (expr), ref_p);
 604   stream_write_tree (ob, DECL_SIZE_UNIT (expr), ref_p);
 605
 606   /* Note, DECL_INITIAL is not handled here.  Since DECL_INITIAL needs
 607      special handling in LTO, it must be handled by streamer hooks.  */
 608
 609   stream_write_tree (ob, DECL_ATTRIBUTES (expr), ref_p);
 610
 611   /* Do not stream DECL_ABSTRACT_ORIGIN.  We cannot handle debug information
 612      for early inlining so drop it on the floor instead of ICEing in
 613      dwarf2out.c.  */
 614
 615   if ((TREE_CODE (expr) == VAR_DECL
 616        || TREE_CODE (expr) == PARM_DECL)
 617       && DECL_HAS_VALUE_EXPR_P (expr))
 618     stream_write_tree (ob, DECL_VALUE_EXPR (expr), ref_p);
 619
 620   if (TREE_CODE (expr) == VAR_DECL)
 621     stream_write_tree (ob, DECL_DEBUG_EXPR (expr), ref_p);
 622 }
 623
 624
 625 /* Write all pointer fields in the TS_DECL_NON_COMMON structure of
 626    EXPR to output block OB.  If REF_P is true, write a reference to EXPR's
 627    pointer fields.  */
 628
 629 static void
 630 write_ts_decl_non_common_tree_pointers (struct output_block *ob, tree expr,
 631                                         bool ref_p)
 632 {
 633   if (TREE_CODE (expr) == TYPE_DECL)
 634     stream_write_tree (ob, DECL_ORIGINAL_TYPE (expr), ref_p);
 635 }
 636
 637
 638 /* Write all pointer fields in the TS_DECL_WITH_VIS structure of EXPR
 639    to output block OB.  If REF_P is true, write a reference to EXPR's
 640    pointer fields.  */
 641
 642 static void
 643 write_ts_decl_with_vis_tree_pointers (struct output_block *ob, tree expr,
 644                                       bool ref_p)
 645 {
 646   /* Make sure we don't inadvertently set the assembler name.  */
 647   if (DECL_ASSEMBLER_NAME_SET_P (expr))
 648     stream_write_tree (ob, DECL_ASSEMBLER_NAME (expr), ref_p);
 649   else
 650     stream_write_tree (ob, NULL_TREE, false);
 651 }
 652
 653
 654 /* Write all pointer fields in the TS_FIELD_DECL structure of EXPR to
 655    output block OB.  If REF_P is true, write a reference to EXPR's
 656    pointer fields.  */
 657
 658 static void
 659 write_ts_field_decl_tree_pointers (struct output_block *ob, tree expr,
 660                                    bool ref_p)
 661 {
 662   stream_write_tree (ob, DECL_FIELD_OFFSET (expr), ref_p);
 663   stream_write_tree (ob, DECL_BIT_FIELD_TYPE (expr), ref_p);
 664   stream_write_tree (ob, DECL_BIT_FIELD_REPRESENTATIVE (expr), ref_p);
 665   stream_write_tree (ob, DECL_FIELD_BIT_OFFSET (expr), ref_p);
 666   stream_write_tree (ob, DECL_FCONTEXT (expr), ref_p);
 667 }
 668
 669
 670 /* Write all pointer fields in the TS_FUNCTION_DECL structure of EXPR
 671    to output block OB.  If REF_P is true, write a reference to EXPR's
 672    pointer fields.  */
 673
 674 static void
 675 write_ts_function_decl_tree_pointers (struct output_block *ob, tree expr,
 676                                       bool ref_p)
 677 {
 678   stream_write_tree (ob, DECL_VINDEX (expr), ref_p);
 679   /* DECL_STRUCT_FUNCTION is handled by lto_output_function.  */
 680   stream_write_tree (ob, DECL_FUNCTION_PERSONALITY (expr), ref_p);
 681   stream_write_tree (ob, DECL_FUNCTION_SPECIFIC_TARGET (expr), ref_p);
 682   stream_write_tree (ob, DECL_FUNCTION_SPECIFIC_OPTIMIZATION (expr), ref_p);
 683 }
 684
 685
 686 /* Write all pointer fields in the TS_TYPE_COMMON structure of EXPR to
 687    output block OB.  If REF_P is true, write a reference to EXPR's
 688    pointer fields.  */
 689
 690 static void
 691 write_ts_type_common_tree_pointers (struct output_block *ob, tree expr,
 692                                     bool ref_p)
 693 {
 694   stream_write_tree (ob, TYPE_SIZE (expr), ref_p);
 695   stream_write_tree (ob, TYPE_SIZE_UNIT (expr), ref_p);
 696   stream_write_tree (ob, TYPE_ATTRIBUTES (expr), ref_p);
 697   stream_write_tree (ob, TYPE_NAME (expr), ref_p);
 698   /* Do not stream TYPE_POINTER_TO or TYPE_REFERENCE_TO.  They will be
 699      reconstructed during fixup.  */
 700   /* Do not stream TYPE_NEXT_VARIANT, we reconstruct the variant lists
 701      during fixup.  */
 702   stream_write_tree (ob, TYPE_MAIN_VARIANT (expr), ref_p);
 703   stream_write_tree (ob, TYPE_CONTEXT (expr), ref_p);
 704   /* TYPE_CANONICAL is re-computed during type merging, so no need
 705      to stream it here.  */
 706   stream_write_tree (ob, TYPE_STUB_DECL (expr), ref_p);
 707 }
 708
 709 /* Write all pointer fields in the TS_TYPE_NON_COMMON structure of EXPR
 710    to output block OB.  If REF_P is true, write a reference to EXPR's
 711    pointer fields.  */
 712
 713 static void
 714 write_ts_type_non_common_tree_pointers (struct output_block *ob, tree expr,
 715                                         bool ref_p)
 716 {
 717   if (TREE_CODE (expr) == ENUMERAL_TYPE)
 718     stream_write_tree (ob, TYPE_VALUES (expr), ref_p);
 719   else if (TREE_CODE (expr) == ARRAY_TYPE)
 720     stream_write_tree (ob, TYPE_DOMAIN (expr), ref_p);
 721   else if (RECORD_OR_UNION_TYPE_P (expr))
 722     streamer_write_chain (ob, TYPE_FIELDS (expr), ref_p);
 723   else if (TREE_CODE (expr) == FUNCTION_TYPE
 724            || TREE_CODE (expr) == METHOD_TYPE)
 725     stream_write_tree (ob, TYPE_ARG_TYPES (expr), ref_p);
 726
 727   if (!POINTER_TYPE_P (expr))
 728     stream_write_tree (ob, TYPE_MINVAL (expr), ref_p);
 729   stream_write_tree (ob, TYPE_MAXVAL (expr), ref_p);
 730   if (RECORD_OR_UNION_TYPE_P (expr))
 731     stream_write_tree (ob, TYPE_BINFO (expr), ref_p);
 732 }
 733
 734
 735 /* Write all pointer fields in the TS_LIST structure of EXPR to output
 736    block OB.  If REF_P is true, write a reference to EXPR's pointer
 737    fields.  */
 738
 739 static void
 740 write_ts_list_tree_pointers (struct output_block *ob, tree expr, bool ref_p)
 741 {
 742   stream_write_tree (ob, TREE_PURPOSE (expr), ref_p);
 743   stream_write_tree (ob, TREE_VALUE (expr), ref_p);
 744   stream_write_tree (ob, TREE_CHAIN (expr), ref_p);
 745 }
 746
 747
 748 /* Write all pointer fields in the TS_VEC structure of EXPR to output
 749    block OB.  If REF_P is true, write a reference to EXPR's pointer
 750    fields.  */
 751
 752 static void
 753 write_ts_vec_tree_pointers (struct output_block *ob, tree expr, bool ref_p)
 754 {
 755   int i;
 756
 757   /* Note that the number of slots for EXPR has already been emitted
 758      in EXPR's header (see streamer_write_tree_header).  */
 759   for (i = 0; i < TREE_VEC_LENGTH (expr); i++)
 760     stream_write_tree (ob, TREE_VEC_ELT (expr, i), ref_p);
 761 }
 762
 763
 764 /* Write all pointer fields in the TS_EXP structure of EXPR to output
 765    block OB.  If REF_P is true, write a reference to EXPR's pointer
 766    fields.  */
 767
 768 static void
 769 write_ts_exp_tree_pointers (struct output_block *ob, tree expr, bool ref_p)
 770 {
 771   int i;
 772
 773   for (i = 0; i < TREE_OPERAND_LENGTH (expr); i++)
 774     stream_write_tree (ob, TREE_OPERAND (expr, i), ref_p);
 775   stream_write_tree (ob, TREE_BLOCK (expr), ref_p);
 776 }
 777
 778
 779 /* Write all pointer fields in the TS_BLOCK structure of EXPR to output
 780    block OB.  If REF_P is true, write a reference to EXPR's pointer
 781    fields.  */
 782
 783 static void
 784 write_ts_block_tree_pointers (struct output_block *ob, tree expr, bool ref_p)
 785 {
 786   streamer_write_chain (ob, BLOCK_VARS (expr), ref_p);
 787
 788   stream_write_tree (ob, BLOCK_SUPERCONTEXT (expr), ref_p);
 789
 790   /* Stream BLOCK_ABSTRACT_ORIGIN for the limited cases we can handle - those
 791      that represent inlined function scopes.
 792      For the rest them on the floor instead of ICEing in dwarf2out.c.  */
 793   if (inlined_function_outer_scope_p (expr))
 794     {
 795       tree ultimate_origin = block_ultimate_origin (expr);
 796       stream_write_tree (ob, ultimate_origin, ref_p);
 797     }
 798   else
 799     stream_write_tree (ob, NULL_TREE, ref_p);
 800   /* Do not stream BLOCK_NONLOCALIZED_VARS.  We cannot handle debug information
 801      for early inlined BLOCKs so drop it on the floor instead of ICEing in
 802      dwarf2out.c.  */
 803
 804   /* BLOCK_FRAGMENT_ORIGIN and BLOCK_FRAGMENT_CHAIN is not live at LTO
 805      streaming time.  */
 806
 807   /* Do not output BLOCK_SUBBLOCKS.  Instead on streaming-in this
 808      list is re-constructed from BLOCK_SUPERCONTEXT.  */
 809 }
 810
 811
 812 /* Write all pointer fields in the TS_BINFO structure of EXPR to output
 813    block OB.  If REF_P is true, write a reference to EXPR's pointer
 814    fields.  */
 815
 816 static void
 817 write_ts_binfo_tree_pointers (struct output_block *ob, tree expr, bool ref_p)
 818 {
 819   unsigned i;
 820   tree t;
 821
 822   /* Note that the number of BINFO slots has already been emitted in
 823      EXPR's header (see streamer_write_tree_header) because this length
 824      is needed to build the empty BINFO node on the reader side.  */
 825   FOR_EACH_VEC_ELT (*BINFO_BASE_BINFOS (expr), i, t)
 826     stream_write_tree (ob, t, ref_p);
 827   stream_write_tree (ob, NULL_TREE, false);
 828
 829   stream_write_tree (ob, BINFO_OFFSET (expr), ref_p);
 830   stream_write_tree (ob, BINFO_VTABLE (expr), ref_p);
 831   stream_write_tree (ob, BINFO_VPTR_FIELD (expr), ref_p);
 832
 833   /* The number of BINFO_BASE_ACCESSES has already been emitted in
 834      EXPR's bitfield section.  */
 835   FOR_EACH_VEC_SAFE_ELT (BINFO_BASE_ACCESSES (expr), i, t)
 836     stream_write_tree (ob, t, ref_p);
 837
 838   /* Do not walk BINFO_INHERITANCE_CHAIN, BINFO_SUBVTT_INDEX
 839      and BINFO_VPTR_INDEX; these are used by C++ FE only.  */
 840 }
 841
 842
 843 /* Write all pointer fields in the TS_CONSTRUCTOR structure of EXPR to
 844    output block OB.  If REF_P is true, write a reference to EXPR's
 845    pointer fields.  */
 846
 847 static void
 848 write_ts_constructor_tree_pointers (struct output_block *ob, tree expr,
 849                                     bool ref_p)
 850 {
 851   unsigned i;
 852   tree index, value;
 853
 854   FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (expr), i, index, value)
 855     {
 856       stream_write_tree (ob, index, ref_p);
 857       stream_write_tree (ob, value, ref_p);
 858     }
 859 }
 860
 861
 862 /* Write all pointer fields in the TS_OMP_CLAUSE structure of EXPR
 863    to output block OB.  If REF_P is true, write a reference to EXPR's
 864    pointer fields.  */
 865
 866 static void
 867 write_ts_omp_clause_tree_pointers (struct output_block *ob, tree expr,
 868                                    bool ref_p)
 869 {
 870   int i;
 871   for (i = 0; i < omp_clause_num_ops[OMP_CLAUSE_CODE (expr)]; i++)
 872     stream_write_tree (ob, OMP_CLAUSE_OPERAND (expr, i), ref_p);
 873   if (OMP_CLAUSE_CODE (expr) == OMP_CLAUSE_REDUCTION)
 874     {
 875       /* We don't stream these right now, handle it if streaming
 876          of them is needed.  */
 877       gcc_assert (OMP_CLAUSE_REDUCTION_GIMPLE_INIT (expr) == NULL);
 878       gcc_assert (OMP_CLAUSE_REDUCTION_GIMPLE_MERGE (expr) == NULL);
 879     }
 880   stream_write_tree (ob, OMP_CLAUSE_CHAIN (expr), ref_p);
 881 }
 882
 883
 884 /* Write all pointer fields in EXPR to output block OB.  If REF_P is true,
 885    the leaves of EXPR are emitted as references.  */
 886
 887 void
 888 streamer_write_tree_body (struct output_block *ob, tree expr, bool ref_p)
 889 {
 890   enum tree_code code;
 891
 892   lto_stats.num_tree_bodies_output++;
 893
 894   code = TREE_CODE (expr);
 895
 896   if (CODE_CONTAINS_STRUCT (code, TS_TYPED))
 897     write_ts_common_tree_pointers (ob, expr, ref_p);
 898
 899   if (CODE_CONTAINS_STRUCT (code, TS_VECTOR))
 900     write_ts_vector_tree_pointers (ob, expr, ref_p);
 901
 902   if (CODE_CONTAINS_STRUCT (code, TS_COMPLEX))
 903     write_ts_complex_tree_pointers (ob, expr, ref_p);
 904
 905   if (CODE_CONTAINS_STRUCT (code, TS_DECL_MINIMAL))
 906     write_ts_decl_minimal_tree_pointers (ob, expr, ref_p);
 907
 908   if (CODE_CONTAINS_STRUCT (code, TS_DECL_COMMON))
 909     write_ts_decl_common_tree_pointers (ob, expr, ref_p);
 910
 911   if (CODE_CONTAINS_STRUCT (code, TS_DECL_NON_COMMON))
 912     write_ts_decl_non_common_tree_pointers (ob, expr, ref_p);
 913
 914   if (CODE_CONTAINS_STRUCT (code, TS_DECL_WITH_VIS))
 915     write_ts_decl_with_vis_tree_pointers (ob, expr, ref_p);
 916
 917   if (CODE_CONTAINS_STRUCT (code, TS_FIELD_DECL))
 918     write_ts_field_decl_tree_pointers (ob, expr, ref_p);
 919
 920   if (CODE_CONTAINS_STRUCT (code, TS_FUNCTION_DECL))
 921     write_ts_function_decl_tree_pointers (ob, expr, ref_p);
 922
 923   if (CODE_CONTAINS_STRUCT (code, TS_TYPE_COMMON))
 924     write_ts_type_common_tree_pointers (ob, expr, ref_p);
 925
 926   if (CODE_CONTAINS_STRUCT (code, TS_TYPE_NON_COMMON))
 927     write_ts_type_non_common_tree_pointers (ob, expr, ref_p);
 928
 929   if (CODE_CONTAINS_STRUCT (code, TS_LIST))
 930     write_ts_list_tree_pointers (ob, expr, ref_p);
 931
 932   if (CODE_CONTAINS_STRUCT (code, TS_VEC))
 933     write_ts_vec_tree_pointers (ob, expr, ref_p);
 934
 935   if (CODE_CONTAINS_STRUCT (code, TS_EXP))
 936     write_ts_exp_tree_pointers (ob, expr, ref_p);
 937
 938   if (CODE_CONTAINS_STRUCT (code, TS_BLOCK))
 939     write_ts_block_tree_pointers (ob, expr, ref_p);
 940
 941   if (CODE_CONTAINS_STRUCT (code, TS_BINFO))
 942     write_ts_binfo_tree_pointers (ob, expr, ref_p);
 943
 944   if (CODE_CONTAINS_STRUCT (code, TS_CONSTRUCTOR))
 945     write_ts_constructor_tree_pointers (ob, expr, ref_p);
 946
 947   if (code == OMP_CLAUSE)
 948     write_ts_omp_clause_tree_pointers (ob, expr, ref_p);
 949 }
 950
 951
 952 /* Emit header information for tree EXPR to output block OB.  The header
 953    contains everything needed to instantiate an empty skeleton for
 954    EXPR on the reading side.  IX is the index into the streamer cache
 955    where EXPR is stored.  */
 956
 957 void
 958 streamer_write_tree_header (struct output_block *ob, tree expr)
 959 {
 960   enum LTO_tags tag;
 961   enum tree_code code;
 962
 963   /* We should not see any tree nodes not handled by the streamer.  */
 964   code = TREE_CODE (expr);
 965
 966   /* The header of a tree node consists of its tag, the size of
 967      the node, and any other information needed to instantiate
 968      EXPR on the reading side (such as the number of slots in
 969      variable sized nodes).  */
 970   tag = lto_tree_code_to_tag (code);
 971   streamer_write_record_start (ob, tag);
 972
 973   /* The following will cause bootstrap miscomparisons.  Enable with care.  */
 974 #ifdef LTO_STREAMER_DEBUG
 975   /* This is used mainly for debugging purposes.  When the reader
 976      and the writer do not agree on a streamed node, the pointer
 977      value for EXPR can be used to track down the differences in
 978      the debugger.  */
 979   gcc_assert ((HOST_WIDE_INT) (intptr_t) expr == (intptr_t) expr);
 980   streamer_write_hwi (ob, (HOST_WIDE_INT) (intptr_t) expr);
 981 #endif
 982
 983   /* The text in strings and identifiers are completely emitted in
 984      the header.  */
 985   if (CODE_CONTAINS_STRUCT (code, TS_STRING))
 986     streamer_write_string_cst (ob, ob->main_stream, expr);
 987   else if (CODE_CONTAINS_STRUCT (code, TS_IDENTIFIER))
 988     write_identifier (ob, ob->main_stream, expr);
 989   else if (CODE_CONTAINS_STRUCT (code, TS_VECTOR))
 990     streamer_write_hwi (ob, VECTOR_CST_NELTS (expr));
 991   else if (CODE_CONTAINS_STRUCT (code, TS_VEC))
 992     streamer_write_hwi (ob, TREE_VEC_LENGTH (expr));
 993   else if (CODE_CONTAINS_STRUCT (code, TS_BINFO))
 994     streamer_write_uhwi (ob, BINFO_N_BASE_BINFOS (expr));
 995   else if (TREE_CODE (expr) == CALL_EXPR)
 996     streamer_write_uhwi (ob, call_expr_nargs (expr));
 997   else if (TREE_CODE (expr) == OMP_CLAUSE)
 998     streamer_write_uhwi (ob, OMP_CLAUSE_CODE (expr));
 999   else if (CODE_CONTAINS_STRUCT (code, TS_INT_CST))
1000     {
1001       gcc_checking_assert (TREE_INT_CST_NUNITS (expr));
1002       streamer_write_uhwi (ob, TREE_INT_CST_NUNITS (expr));
1003       streamer_write_uhwi (ob, TREE_INT_CST_EXT_NUNITS (expr));
1004     }
1005 }
1006
1007
1008 /* Emit the integer constant CST to output block OB.  If REF_P is true,
1009    CST's type will be emitted as a reference.  */
1010
1011 void
1012 streamer_write_integer_cst (struct output_block *ob, tree cst, bool ref_p)
1013 {
1014   int i;
1015   int len = TREE_INT_CST_NUNITS (cst);
1016   gcc_assert (!TREE_OVERFLOW (cst));
1017   streamer_write_record_start (ob, LTO_integer_cst);
1018   stream_write_tree (ob, TREE_TYPE (cst), ref_p);
1019   /* We're effectively streaming a non-sign-extended wide_int here,
1020      so there's no need to stream TREE_INT_CST_EXT_NUNITS or any
1021      array members beyond LEN.  We'll recreate the tree from the
1022      wide_int and the type.  */
1023   streamer_write_uhwi (ob, len);
1024   for (i = 0; i < len; i++)
1025     streamer_write_hwi (ob, TREE_INT_CST_ELT (cst, i));
1026 }