gcc/tree-streamer-in.c

   1 /* Routines for reading trees from a file stream.
   2
   3    Copyright 2011 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 "diagnostic.h"
  26 #include "tree.h"
  27 #include "tree-flow.h"
  28 #include "tree-streamer.h"
  29 #include "data-streamer.h"
  30 #include "streamer-hooks.h"
  31 #include "lto-streamer.h"
  32
  33 /* Read a STRING_CST from the string table in DATA_IN using input
  34    block IB.  */
  35
  36 tree
  37 streamer_read_string_cst (struct data_in *data_in, struct lto_input_block *ib)
  38 {
  39   unsigned int len;
  40   const char * ptr;
  41
  42   ptr = streamer_read_indexed_string (data_in, ib, &len);
  43   if (!ptr)
  44     return NULL;
  45   return build_string (len, ptr);
  46 }
  47
  48
  49 /* Read an IDENTIFIER from the string table in DATA_IN using input
  50    block IB.  */
  51
  52 static tree
  53 input_identifier (struct data_in *data_in, struct lto_input_block *ib)
  54 {
  55   unsigned int len;
  56   const char *ptr;
  57
  58   ptr = streamer_read_indexed_string (data_in, ib, &len);
  59   if (!ptr)
  60     return NULL;
  61   return get_identifier_with_length (ptr, len);
  62 }
  63
  64
  65 /* Read a chain of tree nodes from input block IB. DATA_IN contains
  66    tables and descriptors for the file being read.  */
  67
  68 tree
  69 streamer_read_chain (struct lto_input_block *ib, struct data_in *data_in)
  70 {
  71   int i, count;
  72   tree first, prev, curr;
  73
  74   first = prev = NULL_TREE;
  75   count = streamer_read_hwi (ib);
  76   for (i = 0; i < count; i++)
  77     {
  78       curr = stream_read_tree (ib, data_in);
  79       if (prev)
  80         TREE_CHAIN (prev) = curr;
  81       else
  82         first = curr;
  83
  84       TREE_CHAIN (curr) = NULL_TREE;
  85       prev = curr;
  86     }
  87
  88   return first;
  89 }
  90
  91
  92 /* Unpack all the non-pointer fields of the TS_BASE structure of
  93    expression EXPR from bitpack BP.  */
  94
  95 static void
  96 unpack_ts_base_value_fields (struct bitpack_d *bp, tree expr)
  97 {
  98   /* Note that the code for EXPR has already been unpacked to create EXPR in
  99      streamer_alloc_tree.  */
 100   if (!TYPE_P (expr))
 101     {
 102       TREE_SIDE_EFFECTS (expr) = (unsigned) bp_unpack_value (bp, 1);
 103       TREE_CONSTANT (expr) = (unsigned) bp_unpack_value (bp, 1);
 104       TREE_READONLY (expr) = (unsigned) bp_unpack_value (bp, 1);
 105
 106       /* TREE_PUBLIC is used on types to indicate that the type
 107          has a TYPE_CACHED_VALUES vector.  This is not streamed out,
 108          so we skip it here.  */
 109       TREE_PUBLIC (expr) = (unsigned) bp_unpack_value (bp, 1);
 110     }
 111   else
 112     bp_unpack_value (bp, 4);
 113   TREE_ADDRESSABLE (expr) = (unsigned) bp_unpack_value (bp, 1);
 114   TREE_THIS_VOLATILE (expr) = (unsigned) bp_unpack_value (bp, 1);
 115   if (DECL_P (expr))
 116     DECL_UNSIGNED (expr) = (unsigned) bp_unpack_value (bp, 1);
 117   else if (TYPE_P (expr))
 118     TYPE_UNSIGNED (expr) = (unsigned) bp_unpack_value (bp, 1);
 119   else
 120     bp_unpack_value (bp, 1);
 121   TREE_ASM_WRITTEN (expr) = (unsigned) bp_unpack_value (bp, 1);
 122   if (TYPE_P (expr))
 123     TYPE_ARTIFICIAL (expr) = (unsigned) bp_unpack_value (bp, 1);
 124   else
 125     TREE_NO_WARNING (expr) = (unsigned) bp_unpack_value (bp, 1);
 126   TREE_USED (expr) = (unsigned) bp_unpack_value (bp, 1);
 127   TREE_NOTHROW (expr) = (unsigned) bp_unpack_value (bp, 1);
 128   TREE_STATIC (expr) = (unsigned) bp_unpack_value (bp, 1);
 129   TREE_PRIVATE (expr) = (unsigned) bp_unpack_value (bp, 1);
 130   TREE_PROTECTED (expr) = (unsigned) bp_unpack_value (bp, 1);
 131   TREE_DEPRECATED (expr) = (unsigned) bp_unpack_value (bp, 1);
 132   if (TYPE_P (expr))
 133     {
 134       TYPE_SATURATING (expr) = (unsigned) bp_unpack_value (bp, 1);
 135       TYPE_ADDR_SPACE (expr) = (unsigned) bp_unpack_value (bp, 8);
 136     }
 137   else if (TREE_CODE (expr) == SSA_NAME)
 138     SSA_NAME_IS_DEFAULT_DEF (expr) = (unsigned) bp_unpack_value (bp, 1);
 139   else
 140     bp_unpack_value (bp, 1);
 141 }
 142
 143
 144 /* Unpack all the non-pointer fields of the TS_REAL_CST structure of
 145    expression EXPR from bitpack BP.  */
 146
 147 static void
 148 unpack_ts_real_cst_value_fields (struct bitpack_d *bp, tree expr)
 149 {
 150   unsigned i;
 151   REAL_VALUE_TYPE r;
 152   REAL_VALUE_TYPE *rp;
 153
 154   r.cl = (unsigned) bp_unpack_value (bp, 2);
 155   r.decimal = (unsigned) bp_unpack_value (bp, 1);
 156   r.sign = (unsigned) bp_unpack_value (bp, 1);
 157   r.signalling = (unsigned) bp_unpack_value (bp, 1);
 158   r.canonical = (unsigned) bp_unpack_value (bp, 1);
 159   r.uexp = (unsigned) bp_unpack_value (bp, EXP_BITS);
 160   for (i = 0; i < SIGSZ; i++)
 161     r.sig[i] = (unsigned long) bp_unpack_value (bp, HOST_BITS_PER_LONG);
 162
 163   rp = ggc_alloc_real_value ();
 164   memcpy (rp, &r, sizeof (REAL_VALUE_TYPE));
 165   TREE_REAL_CST_PTR (expr) = rp;
 166 }
 167
 168
 169 /* Unpack all the non-pointer fields of the TS_FIXED_CST structure of
 170    expression EXPR from bitpack BP.  */
 171
 172 static void
 173 unpack_ts_fixed_cst_value_fields (struct bitpack_d *bp, tree expr)
 174 {
 175   struct fixed_value fv;
 176
 177   fv.mode = bp_unpack_enum (bp, machine_mode, MAX_MACHINE_MODE);
 178   fv.data.low = bp_unpack_var_len_int (bp);
 179   fv.data.high = bp_unpack_var_len_int (bp);
 180   TREE_FIXED_CST (expr) = fv;
 181 }
 182
 183
 184 /* Unpack all the non-pointer fields of the TS_DECL_COMMON structure
 185    of expression EXPR from bitpack BP.  */
 186
 187 static void
 188 unpack_ts_decl_common_value_fields (struct bitpack_d *bp, tree expr)
 189 {
 190   DECL_MODE (expr) = bp_unpack_enum (bp, machine_mode, MAX_MACHINE_MODE);
 191   DECL_NONLOCAL (expr) = (unsigned) bp_unpack_value (bp, 1);
 192   DECL_VIRTUAL_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 193   DECL_IGNORED_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 194   DECL_ABSTRACT (expr) = (unsigned) bp_unpack_value (bp, 1);
 195   DECL_ARTIFICIAL (expr) = (unsigned) bp_unpack_value (bp, 1);
 196   DECL_USER_ALIGN (expr) = (unsigned) bp_unpack_value (bp, 1);
 197   DECL_PRESERVE_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 198   DECL_DEBUG_EXPR_IS_FROM (expr) = (unsigned) bp_unpack_value (bp, 1);
 199   DECL_EXTERNAL (expr) = (unsigned) bp_unpack_value (bp, 1);
 200   DECL_GIMPLE_REG_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 201   DECL_ALIGN (expr) = (unsigned) bp_unpack_var_len_unsigned (bp);
 202
 203   if (TREE_CODE (expr) == LABEL_DECL)
 204     {
 205       DECL_ERROR_ISSUED (expr) = (unsigned) bp_unpack_value (bp, 1);
 206       EH_LANDING_PAD_NR (expr) = (int) bp_unpack_var_len_unsigned (bp);
 207
 208       /* Always assume an initial value of -1 for LABEL_DECL_UID to
 209          force gimple_set_bb to recreate label_to_block_map.  */
 210       LABEL_DECL_UID (expr) = -1;
 211     }
 212
 213   if (TREE_CODE (expr) == FIELD_DECL)
 214     {
 215       DECL_PACKED (expr) = (unsigned) bp_unpack_value (bp, 1);
 216       DECL_NONADDRESSABLE_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 217       expr->decl_common.off_align = bp_unpack_value (bp, 8);
 218     }
 219
 220   if (TREE_CODE (expr) == RESULT_DECL
 221       || TREE_CODE (expr) == PARM_DECL
 222       || TREE_CODE (expr) == VAR_DECL)
 223     {
 224       DECL_BY_REFERENCE (expr) = (unsigned) bp_unpack_value (bp, 1);
 225       if (TREE_CODE (expr) == VAR_DECL
 226           || TREE_CODE (expr) == PARM_DECL)
 227         DECL_HAS_VALUE_EXPR_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 228       DECL_RESTRICTED_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 229     }
 230 }
 231
 232
 233 /* Unpack all the non-pointer fields of the TS_DECL_WRTL structure
 234    of expression EXPR from bitpack BP.  */
 235
 236 static void
 237 unpack_ts_decl_wrtl_value_fields (struct bitpack_d *bp, tree expr)
 238 {
 239   DECL_REGISTER (expr) = (unsigned) bp_unpack_value (bp, 1);
 240 }
 241
 242
 243 /* Unpack all the non-pointer fields of the TS_DECL_WITH_VIS structure
 244    of expression EXPR from bitpack BP.  */
 245
 246 static void
 247 unpack_ts_decl_with_vis_value_fields (struct bitpack_d *bp, tree expr)
 248 {
 249   DECL_DEFER_OUTPUT (expr) = (unsigned) bp_unpack_value (bp, 1);
 250   DECL_COMMON (expr) = (unsigned) bp_unpack_value (bp, 1);
 251   DECL_DLLIMPORT_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 252   DECL_WEAK (expr) = (unsigned) bp_unpack_value (bp, 1);
 253   DECL_SEEN_IN_BIND_EXPR_P (expr) = (unsigned) bp_unpack_value (bp,  1);
 254   DECL_COMDAT (expr) = (unsigned) bp_unpack_value (bp,  1);
 255   DECL_VISIBILITY (expr) = (enum symbol_visibility) bp_unpack_value (bp,  2);
 256   DECL_VISIBILITY_SPECIFIED (expr) = (unsigned) bp_unpack_value (bp,  1);
 257
 258   if (TREE_CODE (expr) == VAR_DECL)
 259     {
 260       DECL_HARD_REGISTER (expr) = (unsigned) bp_unpack_value (bp, 1);
 261       DECL_IN_TEXT_SECTION (expr) = (unsigned) bp_unpack_value (bp, 1);
 262       DECL_IN_CONSTANT_POOL (expr) = (unsigned) bp_unpack_value (bp, 1);
 263       DECL_TLS_MODEL (expr) = (enum tls_model) bp_unpack_value (bp,  3);
 264     }
 265
 266   if (VAR_OR_FUNCTION_DECL_P (expr))
 267     {
 268       priority_type p;
 269       p = (priority_type) bp_unpack_var_len_unsigned (bp);
 270       SET_DECL_INIT_PRIORITY (expr, p);
 271     }
 272 }
 273
 274
 275 /* Unpack all the non-pointer fields of the TS_FUNCTION_DECL structure
 276    of expression EXPR from bitpack BP.  */
 277
 278 static void
 279 unpack_ts_function_decl_value_fields (struct bitpack_d *bp, tree expr)
 280 {
 281   DECL_BUILT_IN_CLASS (expr) = bp_unpack_enum (bp, built_in_class,
 282                                                BUILT_IN_LAST);
 283   DECL_STATIC_CONSTRUCTOR (expr) = (unsigned) bp_unpack_value (bp, 1);
 284   DECL_STATIC_DESTRUCTOR (expr) = (unsigned) bp_unpack_value (bp, 1);
 285   DECL_UNINLINABLE (expr) = (unsigned) bp_unpack_value (bp, 1);
 286   DECL_POSSIBLY_INLINED (expr) = (unsigned) bp_unpack_value (bp, 1);
 287   DECL_IS_NOVOPS (expr) = (unsigned) bp_unpack_value (bp, 1);
 288   DECL_IS_RETURNS_TWICE (expr) = (unsigned) bp_unpack_value (bp, 1);
 289   DECL_IS_MALLOC (expr) = (unsigned) bp_unpack_value (bp, 1);
 290   DECL_IS_OPERATOR_NEW (expr) = (unsigned) bp_unpack_value (bp, 1);
 291   DECL_DECLARED_INLINE_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 292   DECL_STATIC_CHAIN (expr) = (unsigned) bp_unpack_value (bp, 1);
 293   DECL_NO_INLINE_WARNING_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 294   DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (expr)
 295                         = (unsigned) bp_unpack_value (bp, 1);
 296   DECL_NO_LIMIT_STACK (expr) = (unsigned) bp_unpack_value (bp, 1);
 297   DECL_DISREGARD_INLINE_LIMITS (expr) = (unsigned) bp_unpack_value (bp, 1);
 298   DECL_PURE_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 299   DECL_LOOPING_CONST_OR_PURE_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 300   if (DECL_BUILT_IN_CLASS (expr) != NOT_BUILT_IN)
 301     {
 302       DECL_FUNCTION_CODE (expr) = (enum built_in_function) bp_unpack_value (bp,
 303                                                                             11);
 304       if (DECL_BUILT_IN_CLASS (expr) == BUILT_IN_NORMAL
 305           && DECL_FUNCTION_CODE (expr) >= END_BUILTINS)
 306         fatal_error ("machine independent builtin code out of range");
 307       else if (DECL_BUILT_IN_CLASS (expr) == BUILT_IN_MD)
 308         {
 309           tree result = targetm.builtin_decl (DECL_FUNCTION_CODE (expr), true);
 310           if (!result || result == error_mark_node)
 311             fatal_error ("target specific builtin not available");
 312         }
 313     }
 314   if (DECL_STATIC_DESTRUCTOR (expr))
 315     {
 316       priority_type p;
 317       p = (priority_type) bp_unpack_var_len_unsigned (bp);
 318       SET_DECL_FINI_PRIORITY (expr, p);
 319     }
 320 }
 321
 322
 323 /* Unpack all the non-pointer fields of the TS_TYPE_COMMON structure
 324    of expression EXPR from bitpack BP.  */
 325
 326 static void
 327 unpack_ts_type_common_value_fields (struct bitpack_d *bp, tree expr)
 328 {
 329   enum machine_mode mode;
 330
 331   mode = bp_unpack_enum (bp, machine_mode, MAX_MACHINE_MODE);
 332   SET_TYPE_MODE (expr, mode);
 333   TYPE_STRING_FLAG (expr) = (unsigned) bp_unpack_value (bp, 1);
 334   TYPE_NO_FORCE_BLK (expr) = (unsigned) bp_unpack_value (bp, 1);
 335   TYPE_NEEDS_CONSTRUCTING (expr) = (unsigned) bp_unpack_value (bp, 1);
 336   if (RECORD_OR_UNION_TYPE_P (expr))
 337     TYPE_TRANSPARENT_AGGR (expr) = (unsigned) bp_unpack_value (bp, 1);
 338   TYPE_PACKED (expr) = (unsigned) bp_unpack_value (bp, 1);
 339   TYPE_RESTRICT (expr) = (unsigned) bp_unpack_value (bp, 1);
 340   TYPE_CONTAINS_PLACEHOLDER_INTERNAL (expr)
 341         = (unsigned) bp_unpack_value (bp, 2);
 342   TYPE_USER_ALIGN (expr) = (unsigned) bp_unpack_value (bp, 1);
 343   TYPE_READONLY (expr) = (unsigned) bp_unpack_value (bp, 1);
 344   TYPE_PRECISION (expr) = bp_unpack_var_len_unsigned (bp);
 345   TYPE_ALIGN (expr) = bp_unpack_var_len_unsigned (bp);
 346   TYPE_ALIAS_SET (expr) = bp_unpack_var_len_int (bp);
 347 }
 348
 349
 350 /* Unpack all the non-pointer fields of the TS_BLOCK structure
 351    of expression EXPR from bitpack BP.  */
 352
 353 static void
 354 unpack_ts_block_value_fields (struct bitpack_d *bp, tree expr)
 355 {
 356   BLOCK_ABSTRACT (expr) = (unsigned) bp_unpack_value (bp, 1);
 357   /* BLOCK_NUMBER is recomputed.  */
 358 }
 359
 360 /* Unpack all the non-pointer fields of the TS_TRANSLATION_UNIT_DECL
 361    structure of expression EXPR from bitpack BP.  */
 362
 363 static void
 364 unpack_ts_translation_unit_decl_value_fields (struct bitpack_d *bp ATTRIBUTE_UNUSED, tree expr ATTRIBUTE_UNUSED)
 365 {
 366 }
 367
 368 /* Unpack all the non-pointer fields in EXPR into a bit pack.  */
 369
 370 static void
 371 unpack_value_fields (struct bitpack_d *bp, tree expr)
 372 {
 373   enum tree_code code;
 374
 375   code = TREE_CODE (expr);
 376
 377   /* Note that all these functions are highly sensitive to changes in
 378      the types and sizes of each of the fields being packed.  */
 379   unpack_ts_base_value_fields (bp, expr);
 380
 381   if (CODE_CONTAINS_STRUCT (code, TS_REAL_CST))
 382     unpack_ts_real_cst_value_fields (bp, expr);
 383
 384   if (CODE_CONTAINS_STRUCT (code, TS_FIXED_CST))
 385     unpack_ts_fixed_cst_value_fields (bp, expr);
 386
 387   if (CODE_CONTAINS_STRUCT (code, TS_DECL_COMMON))
 388     unpack_ts_decl_common_value_fields (bp, expr);
 389
 390   if (CODE_CONTAINS_STRUCT (code, TS_DECL_WRTL))
 391     unpack_ts_decl_wrtl_value_fields (bp, expr);
 392
 393   if (CODE_CONTAINS_STRUCT (code, TS_DECL_WITH_VIS))
 394     unpack_ts_decl_with_vis_value_fields (bp, expr);
 395
 396   if (CODE_CONTAINS_STRUCT (code, TS_FUNCTION_DECL))
 397     unpack_ts_function_decl_value_fields (bp, expr);
 398
 399   if (CODE_CONTAINS_STRUCT (code, TS_TYPE_COMMON))
 400     unpack_ts_type_common_value_fields (bp, expr);
 401
 402   if (CODE_CONTAINS_STRUCT (code, TS_BLOCK))
 403     unpack_ts_block_value_fields (bp, expr);
 404
 405   if (CODE_CONTAINS_STRUCT (code, TS_TRANSLATION_UNIT_DECL))
 406     unpack_ts_translation_unit_decl_value_fields (bp, expr);
 407 }
 408
 409
 410 /* Read all the language-independent bitfield values for EXPR from IB.
 411    Return the partially unpacked bitpack so the caller can unpack any other
 412    bitfield values that the writer may have written.  */
 413
 414 struct bitpack_d
 415 streamer_read_tree_bitfields (struct lto_input_block *ib, tree expr)
 416 {
 417   enum tree_code code;
 418   struct bitpack_d bp;
 419
 420   /* Read the bitpack of non-pointer values from IB.  */
 421   bp = streamer_read_bitpack (ib);
 422
 423   /* The first word in BP contains the code of the tree that we
 424      are about to read.  */
 425   code = (enum tree_code) bp_unpack_value (&bp, 16);
 426   lto_tag_check (lto_tree_code_to_tag (code),
 427                  lto_tree_code_to_tag (TREE_CODE (expr)));
 428
 429   /* Unpack all the value fields from BP.  */
 430   unpack_value_fields (&bp, expr);
 431
 432   return bp;
 433 }
 434
 435
 436 /* Materialize a new tree from input block IB using descriptors in
 437    DATA_IN.  The code for the new tree should match TAG.  Store in
 438    *IX_P the index into the reader cache where the new tree is stored.  */
 439
 440 tree
 441 streamer_alloc_tree (struct lto_input_block *ib, struct data_in *data_in,
 442                      enum LTO_tags tag)
 443 {
 444   enum tree_code code;
 445   tree result;
 446 #ifdef LTO_STREAMER_DEBUG
 447   HOST_WIDEST_INT orig_address_in_writer;
 448 #endif
 449
 450   result = NULL_TREE;
 451
 452 #ifdef LTO_STREAMER_DEBUG
 453   /* Read the word representing the memory address for the tree
 454      as it was written by the writer.  This is useful when
 455      debugging differences between the writer and reader.  */
 456   orig_address_in_writer = streamer_read_hwi (ib);
 457   gcc_assert ((intptr_t) orig_address_in_writer == orig_address_in_writer);
 458 #endif
 459
 460   code = lto_tag_to_tree_code (tag);
 461
 462   /* We should never see an SSA_NAME tree.  Only the version numbers of
 463      SSA names are ever written out.  See input_ssa_names.  */
 464   gcc_assert (code != SSA_NAME);
 465
 466   /* Instantiate a new tree using the header data.  */
 467   if (CODE_CONTAINS_STRUCT (code, TS_STRING))
 468     result = streamer_read_string_cst (data_in, ib);
 469   else if (CODE_CONTAINS_STRUCT (code, TS_IDENTIFIER))
 470     result = input_identifier (data_in, ib);
 471   else if (CODE_CONTAINS_STRUCT (code, TS_VEC))
 472     {
 473       HOST_WIDE_INT len = streamer_read_hwi (ib);
 474       result = make_tree_vec (len);
 475     }
 476   else if (CODE_CONTAINS_STRUCT (code, TS_VECTOR))
 477     {
 478       HOST_WIDE_INT len = streamer_read_hwi (ib);
 479       result = ggc_alloc_zone_cleared_tree_node ((len - 1) * sizeof (tree)
 480                                                  + sizeof (struct tree_vector),
 481                                                  &tree_zone);
 482       TREE_SET_CODE (result, VECTOR_CST);
 483     }
 484   else if (CODE_CONTAINS_STRUCT (code, TS_BINFO))
 485     {
 486       unsigned HOST_WIDE_INT len = streamer_read_uhwi (ib);
 487       result = make_tree_binfo (len);
 488     }
 489   else if (code == CALL_EXPR)
 490     {
 491       unsigned HOST_WIDE_INT nargs = streamer_read_uhwi (ib);
 492       return build_vl_exp (CALL_EXPR, nargs + 3);
 493     }
 494   else
 495     {
 496       /* For all other nodes, materialize the tree with a raw
 497          make_node call.  */
 498       result = make_node (code);
 499     }
 500
 501 #ifdef LTO_STREAMER_DEBUG
 502   /* Store the original address of the tree as seen by the writer
 503      in RESULT's aux field.  This is useful when debugging streaming
 504      problems.  This way, a debugging session can be started on
 505      both writer and reader with a breakpoint using this address
 506      value in both.  */
 507   lto_orig_address_map (result, (intptr_t) orig_address_in_writer);
 508 #endif
 509
 510   return result;
 511 }
 512
 513
 514 /* Read all pointer fields in the TS_COMMON structure of EXPR from input
 515    block IB.  DATA_IN contains tables and descriptors for the
 516    file being read.  */
 517
 518
 519 static void
 520 lto_input_ts_common_tree_pointers (struct lto_input_block *ib,
 521                                    struct data_in *data_in, tree expr)
 522 {
 523   if (TREE_CODE (expr) != IDENTIFIER_NODE)
 524     TREE_TYPE (expr) = stream_read_tree (ib, data_in);
 525 }
 526
 527
 528 /* Read all pointer fields in the TS_VECTOR structure of EXPR from input
 529    block IB.  DATA_IN contains tables and descriptors for the
 530    file being read.  */
 531
 532 static void
 533 lto_input_ts_vector_tree_pointers (struct lto_input_block *ib,
 534                                    struct data_in *data_in, tree expr)
 535 {
 536   unsigned i;
 537   for (i = 0; i < VECTOR_CST_NELTS (expr); ++i)
 538     VECTOR_CST_ELT (expr, i) = stream_read_tree (ib, data_in);
 539 }
 540
 541
 542 /* Read all pointer fields in the TS_COMPLEX structure of EXPR from input
 543    block IB.  DATA_IN contains tables and descriptors for the
 544    file being read.  */
 545
 546 static void
 547 lto_input_ts_complex_tree_pointers (struct lto_input_block *ib,
 548                                     struct data_in *data_in, tree expr)
 549 {
 550   TREE_REALPART (expr) = stream_read_tree (ib, data_in);
 551   TREE_IMAGPART (expr) = stream_read_tree (ib, data_in);
 552 }
 553
 554
 555 /* Read all pointer fields in the TS_DECL_MINIMAL structure of EXPR
 556    from input block IB.  DATA_IN contains tables and descriptors for the
 557    file being read.  */
 558
 559 static void
 560 lto_input_ts_decl_minimal_tree_pointers (struct lto_input_block *ib,
 561                                          struct data_in *data_in, tree expr)
 562 {
 563   DECL_NAME (expr) = stream_read_tree (ib, data_in);
 564   DECL_CONTEXT (expr) = stream_read_tree (ib, data_in);
 565   DECL_SOURCE_LOCATION (expr) = lto_input_location (ib, data_in);
 566 }
 567
 568
 569 /* Read all pointer fields in the TS_DECL_COMMON structure of EXPR from
 570    input block IB.  DATA_IN contains tables and descriptors for the
 571    file being read.  */
 572
 573 static void
 574 lto_input_ts_decl_common_tree_pointers (struct lto_input_block *ib,
 575                                         struct data_in *data_in, tree expr)
 576 {
 577   DECL_SIZE (expr) = stream_read_tree (ib, data_in);
 578   DECL_SIZE_UNIT (expr) = stream_read_tree (ib, data_in);
 579   DECL_ATTRIBUTES (expr) = stream_read_tree (ib, data_in);
 580
 581   /* Do not stream DECL_ABSTRACT_ORIGIN.  We cannot handle debug information
 582      for early inlining so drop it on the floor instead of ICEing in
 583      dwarf2out.c.  */
 584
 585   if (TREE_CODE (expr) == PARM_DECL)
 586     TREE_CHAIN (expr) = streamer_read_chain (ib, data_in);
 587
 588   if ((TREE_CODE (expr) == VAR_DECL
 589        || TREE_CODE (expr) == PARM_DECL)
 590       && DECL_HAS_VALUE_EXPR_P (expr))
 591     SET_DECL_VALUE_EXPR (expr, stream_read_tree (ib, data_in));
 592
 593   if (TREE_CODE (expr) == VAR_DECL)
 594     {
 595       tree dexpr = stream_read_tree (ib, data_in);
 596       if (dexpr)
 597         SET_DECL_DEBUG_EXPR (expr, dexpr);
 598     }
 599 }
 600
 601
 602 /* Read all pointer fields in the TS_DECL_NON_COMMON structure of
 603    EXPR from input block IB.  DATA_IN contains tables and descriptors for the
 604    file being read.  */
 605
 606 static void
 607 lto_input_ts_decl_non_common_tree_pointers (struct lto_input_block *ib,
 608                                             struct data_in *data_in, tree expr)
 609 {
 610   if (TREE_CODE (expr) == FUNCTION_DECL)
 611     {
 612       DECL_ARGUMENTS (expr) = stream_read_tree (ib, data_in);
 613       DECL_RESULT (expr) = stream_read_tree (ib, data_in);
 614     }
 615   else if (TREE_CODE (expr) == TYPE_DECL)
 616     DECL_ORIGINAL_TYPE (expr) = stream_read_tree (ib, data_in);
 617   DECL_VINDEX (expr) = stream_read_tree (ib, data_in);
 618 }
 619
 620
 621 /* Read all pointer fields in the TS_DECL_WITH_VIS structure of EXPR
 622    from input block IB.  DATA_IN contains tables and descriptors for the
 623    file being read.  */
 624
 625 static void
 626 lto_input_ts_decl_with_vis_tree_pointers (struct lto_input_block *ib,
 627                                           struct data_in *data_in, tree expr)
 628 {
 629   tree id;
 630
 631   id = stream_read_tree (ib, data_in);
 632   if (id)
 633     {
 634       gcc_assert (TREE_CODE (id) == IDENTIFIER_NODE);
 635       SET_DECL_ASSEMBLER_NAME (expr, id);
 636     }
 637
 638   DECL_SECTION_NAME (expr) = stream_read_tree (ib, data_in);
 639   DECL_COMDAT_GROUP (expr) = stream_read_tree (ib, data_in);
 640 }
 641
 642
 643 /* Read all pointer fields in the TS_FIELD_DECL structure of EXPR from
 644    input block IB.  DATA_IN contains tables and descriptors for the
 645    file being read.  */
 646
 647 static void
 648 lto_input_ts_field_decl_tree_pointers (struct lto_input_block *ib,
 649                                        struct data_in *data_in, tree expr)
 650 {
 651   DECL_FIELD_OFFSET (expr) = stream_read_tree (ib, data_in);
 652   DECL_BIT_FIELD_TYPE (expr) = stream_read_tree (ib, data_in);
 653   DECL_BIT_FIELD_REPRESENTATIVE (expr) = stream_read_tree (ib, data_in);
 654   DECL_FIELD_BIT_OFFSET (expr) = stream_read_tree (ib, data_in);
 655   DECL_FCONTEXT (expr) = stream_read_tree (ib, data_in);
 656 }
 657
 658
 659 /* Read all pointer fields in the TS_FUNCTION_DECL structure of EXPR
 660    from input block IB.  DATA_IN contains tables and descriptors for the
 661    file being read.  */
 662
 663 static void
 664 lto_input_ts_function_decl_tree_pointers (struct lto_input_block *ib,
 665                                           struct data_in *data_in, tree expr)
 666 {
 667   /* DECL_STRUCT_FUNCTION is handled by lto_input_function.  FIXME lto,
 668      maybe it should be handled here?  */
 669   DECL_FUNCTION_PERSONALITY (expr) = stream_read_tree (ib, data_in);
 670   DECL_FUNCTION_SPECIFIC_TARGET (expr) = stream_read_tree (ib, data_in);
 671   DECL_FUNCTION_SPECIFIC_OPTIMIZATION (expr) = stream_read_tree (ib, data_in);
 672
 673   /* If the file contains a function with an EH personality set,
 674      then it was compiled with -fexceptions.  In that case, initialize
 675      the backend EH machinery.  */
 676   if (DECL_FUNCTION_PERSONALITY (expr))
 677     lto_init_eh ();
 678 }
 679
 680
 681 /* Read all pointer fields in the TS_TYPE_COMMON structure of EXPR from
 682    input block IB.  DATA_IN contains tables and descriptors for the file
 683    being read.  */
 684
 685 static void
 686 lto_input_ts_type_common_tree_pointers (struct lto_input_block *ib,
 687                                         struct data_in *data_in, tree expr)
 688 {
 689   TYPE_SIZE (expr) = stream_read_tree (ib, data_in);
 690   TYPE_SIZE_UNIT (expr) = stream_read_tree (ib, data_in);
 691   TYPE_ATTRIBUTES (expr) = stream_read_tree (ib, data_in);
 692   TYPE_NAME (expr) = stream_read_tree (ib, data_in);
 693   /* Do not stream TYPE_POINTER_TO or TYPE_REFERENCE_TO.  They will be
 694      reconstructed during fixup.  */
 695   /* Do not stream TYPE_NEXT_VARIANT, we reconstruct the variant lists
 696      during fixup.  */
 697   TYPE_MAIN_VARIANT (expr) = stream_read_tree (ib, data_in);
 698   TYPE_CONTEXT (expr) = stream_read_tree (ib, data_in);
 699   /* TYPE_CANONICAL gets re-computed during type merging.  */
 700   TYPE_CANONICAL (expr) = NULL_TREE;
 701   TYPE_STUB_DECL (expr) = stream_read_tree (ib, data_in);
 702 }
 703
 704 /* Read all pointer fields in the TS_TYPE_NON_COMMON structure of EXPR
 705    from input block IB.  DATA_IN contains tables and descriptors for the
 706    file being read.  */
 707
 708 static void
 709 lto_input_ts_type_non_common_tree_pointers (struct lto_input_block *ib,
 710                                             struct data_in *data_in,
 711                                             tree expr)
 712 {
 713   if (TREE_CODE (expr) == ENUMERAL_TYPE)
 714     TYPE_VALUES (expr) = stream_read_tree (ib, data_in);
 715   else if (TREE_CODE (expr) == ARRAY_TYPE)
 716     TYPE_DOMAIN (expr) = stream_read_tree (ib, data_in);
 717   else if (RECORD_OR_UNION_TYPE_P (expr))
 718     TYPE_FIELDS (expr) = streamer_read_chain (ib, data_in);
 719   else if (TREE_CODE (expr) == FUNCTION_TYPE
 720            || TREE_CODE (expr) == METHOD_TYPE)
 721     TYPE_ARG_TYPES (expr) = stream_read_tree (ib, data_in);
 722
 723   if (!POINTER_TYPE_P (expr))
 724     TYPE_MINVAL (expr) = stream_read_tree (ib, data_in);
 725   TYPE_MAXVAL (expr) = stream_read_tree (ib, data_in);
 726   if (RECORD_OR_UNION_TYPE_P (expr))
 727     TYPE_BINFO (expr) = stream_read_tree (ib, data_in);
 728 }
 729
 730
 731 /* Read all pointer fields in the TS_LIST structure of EXPR from input
 732    block IB.  DATA_IN contains tables and descriptors for the
 733    file being read.  */
 734
 735 static void
 736 lto_input_ts_list_tree_pointers (struct lto_input_block *ib,
 737                                  struct data_in *data_in, tree expr)
 738 {
 739   TREE_PURPOSE (expr) = stream_read_tree (ib, data_in);
 740   TREE_VALUE (expr) = stream_read_tree (ib, data_in);
 741   TREE_CHAIN (expr) = streamer_read_chain (ib, data_in);
 742 }
 743
 744
 745 /* Read all pointer fields in the TS_VEC structure of EXPR from input
 746    block IB.  DATA_IN contains tables and descriptors for the
 747    file being read.  */
 748
 749 static void
 750 lto_input_ts_vec_tree_pointers (struct lto_input_block *ib,
 751                                 struct data_in *data_in, tree expr)
 752 {
 753   int i;
 754
 755   /* Note that TREE_VEC_LENGTH was read by streamer_alloc_tree to
 756      instantiate EXPR.  */
 757   for (i = 0; i < TREE_VEC_LENGTH (expr); i++)
 758     TREE_VEC_ELT (expr, i) = stream_read_tree (ib, data_in);
 759 }
 760
 761
 762 /* Read all pointer fields in the TS_EXP structure of EXPR from input
 763    block IB.  DATA_IN contains tables and descriptors for the
 764    file being read.  */
 765
 766
 767 static void
 768 lto_input_ts_exp_tree_pointers (struct lto_input_block *ib,
 769                                 struct data_in *data_in, tree expr)
 770 {
 771   int i, length;
 772   location_t loc;
 773
 774   length = streamer_read_hwi (ib);
 775   gcc_assert (length == TREE_OPERAND_LENGTH (expr));
 776
 777   for (i = 0; i < length; i++)
 778     TREE_OPERAND (expr, i) = stream_read_tree (ib, data_in);
 779
 780   loc = lto_input_location (ib, data_in);
 781   SET_EXPR_LOCATION (expr, loc);
 782   TREE_BLOCK (expr) = stream_read_tree (ib, data_in);
 783 }
 784
 785
 786 /* Read all pointer fields in the TS_BLOCK structure of EXPR from input
 787    block IB.  DATA_IN contains tables and descriptors for the
 788    file being read.  */
 789
 790 static void
 791 lto_input_ts_block_tree_pointers (struct lto_input_block *ib,
 792                                   struct data_in *data_in, tree expr)
 793 {
 794   /* Do not stream BLOCK_SOURCE_LOCATION.  We cannot handle debug information
 795      for early inlining so drop it on the floor instead of ICEing in
 796      dwarf2out.c.  */
 797   BLOCK_VARS (expr) = streamer_read_chain (ib, data_in);
 798
 799   /* Do not stream BLOCK_NONLOCALIZED_VARS.  We cannot handle debug information
 800      for early inlining so drop it on the floor instead of ICEing in
 801      dwarf2out.c.  */
 802
 803   BLOCK_SUPERCONTEXT (expr) = stream_read_tree (ib, data_in);
 804
 805   /* Do not stream BLOCK_ABSTRACT_ORIGIN.  We cannot handle debug information
 806      for early inlining so drop it on the floor instead of ICEing in
 807      dwarf2out.c.  */
 808   BLOCK_FRAGMENT_ORIGIN (expr) = stream_read_tree (ib, data_in);
 809   BLOCK_FRAGMENT_CHAIN (expr) = stream_read_tree (ib, data_in);
 810
 811   /* We re-compute BLOCK_SUBBLOCKS of our parent here instead
 812      of streaming it.  For non-BLOCK BLOCK_SUPERCONTEXTs we still
 813      stream the child relationship explicitly.  */
 814   if (BLOCK_SUPERCONTEXT (expr)
 815       && TREE_CODE (BLOCK_SUPERCONTEXT (expr)) == BLOCK)
 816     {
 817       BLOCK_CHAIN (expr) = BLOCK_SUBBLOCKS (BLOCK_SUPERCONTEXT (expr));
 818       BLOCK_SUBBLOCKS (BLOCK_SUPERCONTEXT (expr)) = expr;
 819     }
 820
 821   /* The global block is rooted at the TU decl.  Hook it here to
 822      avoid the need to stream in this block during WPA time.  */
 823   else if (BLOCK_SUPERCONTEXT (expr)
 824            && TREE_CODE (BLOCK_SUPERCONTEXT (expr)) == TRANSLATION_UNIT_DECL)
 825     DECL_INITIAL (BLOCK_SUPERCONTEXT (expr)) = expr;
 826
 827   /* The function-level block is connected at the time we read in
 828      function bodies for the same reason.  */
 829 }
 830
 831
 832 /* Read all pointer fields in the TS_BINFO structure of EXPR from input
 833    block IB.  DATA_IN contains tables and descriptors for the
 834    file being read.  */
 835
 836 static void
 837 lto_input_ts_binfo_tree_pointers (struct lto_input_block *ib,
 838                                   struct data_in *data_in, tree expr)
 839 {
 840   unsigned i, len;
 841   tree t;
 842
 843   /* Note that the number of slots in EXPR was read in
 844      streamer_alloc_tree when instantiating EXPR.  However, the
 845      vector is empty so we cannot rely on VEC_length to know how many
 846      elements to read.  So, this list is emitted as a 0-terminated
 847      list on the writer side.  */
 848   do
 849     {
 850       t = stream_read_tree (ib, data_in);
 851       if (t)
 852         VEC_quick_push (tree, BINFO_BASE_BINFOS (expr), t);
 853     }
 854   while (t);
 855
 856   BINFO_OFFSET (expr) = stream_read_tree (ib, data_in);
 857   BINFO_VTABLE (expr) = stream_read_tree (ib, data_in);
 858   BINFO_VPTR_FIELD (expr) = stream_read_tree (ib, data_in);
 859
 860   len = streamer_read_uhwi (ib);
 861   if (len > 0)
 862     {
 863       VEC_reserve_exact (tree, gc, BINFO_BASE_ACCESSES (expr), len);
 864       for (i = 0; i < len; i++)
 865         {
 866           tree a = stream_read_tree (ib, data_in);
 867           VEC_quick_push (tree, BINFO_BASE_ACCESSES (expr), a);
 868         }
 869     }
 870
 871   BINFO_INHERITANCE_CHAIN (expr) = stream_read_tree (ib, data_in);
 872   BINFO_SUBVTT_INDEX (expr) = stream_read_tree (ib, data_in);
 873   BINFO_VPTR_INDEX (expr) = stream_read_tree (ib, data_in);
 874 }
 875
 876
 877 /* Read all pointer fields in the TS_CONSTRUCTOR structure of EXPR from
 878    input block IB.  DATA_IN contains tables and descriptors for the
 879    file being read.  */
 880
 881 static void
 882 lto_input_ts_constructor_tree_pointers (struct lto_input_block *ib,
 883                                         struct data_in *data_in, tree expr)
 884 {
 885   unsigned i, len;
 886
 887   len = streamer_read_uhwi (ib);
 888   for (i = 0; i < len; i++)
 889     {
 890       tree index, value;
 891
 892       index = stream_read_tree (ib, data_in);
 893       value = stream_read_tree (ib, data_in);
 894       CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (expr), index, value);
 895     }
 896 }
 897
 898
 899 /* Input a TS_TARGET_OPTION tree from IB into EXPR.  */
 900
 901 static void
 902 lto_input_ts_target_option (struct lto_input_block *ib, tree expr)
 903 {
 904   unsigned i, len;
 905   struct bitpack_d bp;
 906   struct cl_target_option *t = TREE_TARGET_OPTION (expr);
 907
 908   bp = streamer_read_bitpack (ib);
 909   len = sizeof (struct cl_target_option);
 910   for (i = 0; i < len; i++)
 911     ((unsigned char *)t)[i] = bp_unpack_value (&bp, 8);
 912   if (bp_unpack_value (&bp, 32) != 0x12345678)
 913     fatal_error ("cl_target_option size mismatch in LTO reader and writer");
 914 }
 915
 916 /* Input a TS_OPTIMIZATION tree from IB into EXPR.  */
 917
 918 static void
 919 lto_input_ts_optimization (struct lto_input_block *ib, tree expr)
 920 {
 921   unsigned i, len;
 922   struct bitpack_d bp;
 923   struct cl_optimization *t = TREE_OPTIMIZATION (expr);
 924
 925   bp = streamer_read_bitpack (ib);
 926   len = sizeof (struct cl_optimization);
 927   for (i = 0; i < len; i++)
 928     ((unsigned char *)t)[i] = bp_unpack_value (&bp, 8);
 929   if (bp_unpack_value (&bp, 32) != 0x12345678)
 930     fatal_error ("cl_optimization size mismatch in LTO reader and writer");
 931 }
 932
 933 /* Input a TS_TRANSLATION_UNIT_DECL tree from IB and DATA_IN into EXPR.  */
 934
 935 static void
 936 lto_input_ts_translation_unit_decl_tree_pointers (struct lto_input_block *ib,
 937                                                   struct data_in *data_in,
 938                                                   tree expr)
 939 {
 940   TRANSLATION_UNIT_LANGUAGE (expr) = xstrdup (streamer_read_string (data_in, ib));
 941   VEC_safe_push (tree, gc, all_translation_units, expr);
 942 }
 943
 944 /* Read all pointer fields in EXPR from input block IB.  DATA_IN
 945    contains tables and descriptors for the file being read.  */
 946
 947 void
 948 streamer_read_tree_body (struct lto_input_block *ib, struct data_in *data_in,
 949                          tree expr)
 950 {
 951   enum tree_code code;
 952
 953   code = TREE_CODE (expr);
 954
 955   if (CODE_CONTAINS_STRUCT (code, TS_TYPED))
 956     lto_input_ts_common_tree_pointers (ib, data_in, expr);
 957
 958   if (CODE_CONTAINS_STRUCT (code, TS_VECTOR))
 959     lto_input_ts_vector_tree_pointers (ib, data_in, expr);
 960
 961   if (CODE_CONTAINS_STRUCT (code, TS_COMPLEX))
 962     lto_input_ts_complex_tree_pointers (ib, data_in, expr);
 963
 964   if (CODE_CONTAINS_STRUCT (code, TS_DECL_MINIMAL))
 965     lto_input_ts_decl_minimal_tree_pointers (ib, data_in, expr);
 966
 967   if (CODE_CONTAINS_STRUCT (code, TS_DECL_COMMON))
 968     lto_input_ts_decl_common_tree_pointers (ib, data_in, expr);
 969
 970   if (CODE_CONTAINS_STRUCT (code, TS_DECL_NON_COMMON))
 971     lto_input_ts_decl_non_common_tree_pointers (ib, data_in, expr);
 972
 973   if (CODE_CONTAINS_STRUCT (code, TS_DECL_WITH_VIS))
 974     lto_input_ts_decl_with_vis_tree_pointers (ib, data_in, expr);
 975
 976   if (CODE_CONTAINS_STRUCT (code, TS_FIELD_DECL))
 977     lto_input_ts_field_decl_tree_pointers (ib, data_in, expr);
 978
 979   if (CODE_CONTAINS_STRUCT (code, TS_FUNCTION_DECL))
 980     lto_input_ts_function_decl_tree_pointers (ib, data_in, expr);
 981
 982   if (CODE_CONTAINS_STRUCT (code, TS_TYPE_COMMON))
 983     lto_input_ts_type_common_tree_pointers (ib, data_in, expr);
 984
 985   if (CODE_CONTAINS_STRUCT (code, TS_TYPE_NON_COMMON))
 986     lto_input_ts_type_non_common_tree_pointers (ib, data_in, expr);
 987
 988   if (CODE_CONTAINS_STRUCT (code, TS_LIST))
 989     lto_input_ts_list_tree_pointers (ib, data_in, expr);
 990
 991   if (CODE_CONTAINS_STRUCT (code, TS_VEC))
 992     lto_input_ts_vec_tree_pointers (ib, data_in, expr);
 993
 994   if (CODE_CONTAINS_STRUCT (code, TS_EXP))
 995     lto_input_ts_exp_tree_pointers (ib, data_in, expr);
 996
 997   if (CODE_CONTAINS_STRUCT (code, TS_BLOCK))
 998     lto_input_ts_block_tree_pointers (ib, data_in, expr);
 999
1000   if (CODE_CONTAINS_STRUCT (code, TS_BINFO))
1001     lto_input_ts_binfo_tree_pointers (ib, data_in, expr);
1002
1003   if (CODE_CONTAINS_STRUCT (code, TS_CONSTRUCTOR))
1004     lto_input_ts_constructor_tree_pointers (ib, data_in, expr);
1005
1006   if (CODE_CONTAINS_STRUCT (code, TS_TARGET_OPTION))
1007     lto_input_ts_target_option (ib, expr);
1008
1009   if (CODE_CONTAINS_STRUCT (code, TS_OPTIMIZATION))
1010     lto_input_ts_optimization (ib, expr);
1011
1012   if (CODE_CONTAINS_STRUCT (code, TS_TRANSLATION_UNIT_DECL))
1013     lto_input_ts_translation_unit_decl_tree_pointers (ib, data_in, expr);
1014 }
1015
1016
1017 /* Read and INTEGER_CST node from input block IB using the per-file
1018    context in DATA_IN.  */
1019
1020 tree
1021 streamer_read_integer_cst (struct lto_input_block *ib, struct data_in *data_in)
1022 {
1023   tree result, type;
1024   HOST_WIDE_INT low, high;
1025   bool overflow_p;
1026
1027   type = stream_read_tree (ib, data_in);
1028   overflow_p = (streamer_read_uchar (ib) != 0);
1029   low = streamer_read_uhwi (ib);
1030   high = streamer_read_uhwi (ib);
1031   result = build_int_cst_wide (type, low, high);
1032
1033   /* If the original constant had overflown, build a replica of RESULT to
1034      avoid modifying the shared constant returned by build_int_cst_wide.  */
1035   if (overflow_p)
1036     {
1037       result = copy_node (result);
1038       TREE_OVERFLOW (result) = 1;
1039     }
1040
1041   return result;
1042 }
1043
1044
1045 /* Read an index IX from input block IB and return the tree node at
1046    DATA_IN->FILE_DATA->GLOBALS_INDEX[IX].  */
1047
1048 tree
1049 streamer_get_pickled_tree (struct lto_input_block *ib, struct data_in *data_in)
1050 {
1051   unsigned HOST_WIDE_INT ix;
1052   tree result;
1053   enum LTO_tags expected_tag;
1054
1055   ix = streamer_read_uhwi (ib);
1056   expected_tag = streamer_read_enum (ib, LTO_tags, LTO_NUM_TAGS);
1057
1058   result = streamer_tree_cache_get (data_in->reader_cache, ix);
1059   gcc_assert (result
1060               && TREE_CODE (result) == lto_tag_to_tree_code (expected_tag));
1061
1062   return result;
1063 }
1064
1065
1066 /* Read a code and class from input block IB and return the
1067    corresponding builtin.  DATA_IN is as in stream_read_tree.  */
1068
1069 tree
1070 streamer_get_builtin_tree (struct lto_input_block *ib, struct data_in *data_in)
1071 {
1072   enum built_in_class fclass;
1073   enum built_in_function fcode;
1074   const char *asmname;
1075   tree result;
1076
1077   fclass = streamer_read_enum (ib, built_in_class, BUILT_IN_LAST);
1078   gcc_assert (fclass == BUILT_IN_NORMAL || fclass == BUILT_IN_MD);
1079
1080   fcode = (enum built_in_function) streamer_read_uhwi (ib);
1081
1082   if (fclass == BUILT_IN_NORMAL)
1083     {
1084       if (fcode >= END_BUILTINS)
1085         fatal_error ("machine independent builtin code out of range");
1086       result = builtin_decl_explicit (fcode);
1087       gcc_assert (result);
1088     }
1089   else if (fclass == BUILT_IN_MD)
1090     {
1091       result = targetm.builtin_decl (fcode, true);
1092       if (!result || result == error_mark_node)
1093         fatal_error ("target specific builtin not available");
1094     }
1095   else
1096     gcc_unreachable ();
1097
1098   asmname = streamer_read_string (data_in, ib);
1099   if (asmname)
1100     set_builtin_user_assembler_name (result, asmname);
1101
1102   streamer_tree_cache_append (data_in->reader_cache, result);
1103
1104   return result;
1105 }