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_BINFO))
 477     {
 478       unsigned HOST_WIDE_INT len = streamer_read_uhwi (ib);
 479       result = make_tree_binfo (len);
 480     }
 481   else if (code == CALL_EXPR)
 482     {
 483       unsigned HOST_WIDE_INT nargs = streamer_read_uhwi (ib);
 484       return build_vl_exp (CALL_EXPR, nargs + 3);
 485     }
 486   else
 487     {
 488       /* For all other nodes, materialize the tree with a raw
 489          make_node call.  */
 490       result = make_node (code);
 491     }
 492
 493 #ifdef LTO_STREAMER_DEBUG
 494   /* Store the original address of the tree as seen by the writer
 495      in RESULT's aux field.  This is useful when debugging streaming
 496      problems.  This way, a debugging session can be started on
 497      both writer and reader with a breakpoint using this address
 498      value in both.  */
 499   lto_orig_address_map (result, (intptr_t) orig_address_in_writer);
 500 #endif
 501
 502   return result;
 503 }
 504
 505
 506 /* Read all pointer fields in the TS_COMMON structure of EXPR from input
 507    block IB.  DATA_IN contains tables and descriptors for the
 508    file being read.  */
 509
 510
 511 static void
 512 lto_input_ts_common_tree_pointers (struct lto_input_block *ib,
 513                                    struct data_in *data_in, tree expr)
 514 {
 515   if (TREE_CODE (expr) != IDENTIFIER_NODE)
 516     TREE_TYPE (expr) = stream_read_tree (ib, data_in);
 517 }
 518
 519
 520 /* Read all pointer fields in the TS_VECTOR structure of EXPR from input
 521    block IB.  DATA_IN contains tables and descriptors for the
 522    file being read.  */
 523
 524 static void
 525 lto_input_ts_vector_tree_pointers (struct lto_input_block *ib,
 526                                    struct data_in *data_in, tree expr)
 527 {
 528   TREE_VECTOR_CST_ELTS (expr) = streamer_read_chain (ib, data_in);
 529 }
 530
 531
 532 /* Read all pointer fields in the TS_COMPLEX structure of EXPR from input
 533    block IB.  DATA_IN contains tables and descriptors for the
 534    file being read.  */
 535
 536 static void
 537 lto_input_ts_complex_tree_pointers (struct lto_input_block *ib,
 538                                     struct data_in *data_in, tree expr)
 539 {
 540   TREE_REALPART (expr) = stream_read_tree (ib, data_in);
 541   TREE_IMAGPART (expr) = stream_read_tree (ib, data_in);
 542 }
 543
 544
 545 /* Read all pointer fields in the TS_DECL_MINIMAL structure of EXPR
 546    from input block IB.  DATA_IN contains tables and descriptors for the
 547    file being read.  */
 548
 549 static void
 550 lto_input_ts_decl_minimal_tree_pointers (struct lto_input_block *ib,
 551                                          struct data_in *data_in, tree expr)
 552 {
 553   DECL_NAME (expr) = stream_read_tree (ib, data_in);
 554   DECL_CONTEXT (expr) = stream_read_tree (ib, data_in);
 555   DECL_SOURCE_LOCATION (expr) = lto_input_location (ib, data_in);
 556 }
 557
 558
 559 /* Read all pointer fields in the TS_DECL_COMMON structure of EXPR from
 560    input block IB.  DATA_IN contains tables and descriptors for the
 561    file being read.  */
 562
 563 static void
 564 lto_input_ts_decl_common_tree_pointers (struct lto_input_block *ib,
 565                                         struct data_in *data_in, tree expr)
 566 {
 567   DECL_SIZE (expr) = stream_read_tree (ib, data_in);
 568   DECL_SIZE_UNIT (expr) = stream_read_tree (ib, data_in);
 569   DECL_ATTRIBUTES (expr) = stream_read_tree (ib, data_in);
 570
 571   /* Do not stream DECL_ABSTRACT_ORIGIN.  We cannot handle debug information
 572      for early inlining so drop it on the floor instead of ICEing in
 573      dwarf2out.c.  */
 574
 575   if (TREE_CODE (expr) == PARM_DECL)
 576     TREE_CHAIN (expr) = streamer_read_chain (ib, data_in);
 577
 578   if ((TREE_CODE (expr) == VAR_DECL
 579        || TREE_CODE (expr) == PARM_DECL)
 580       && DECL_HAS_VALUE_EXPR_P (expr))
 581     SET_DECL_VALUE_EXPR (expr, stream_read_tree (ib, data_in));
 582
 583   if (TREE_CODE (expr) == VAR_DECL)
 584     {
 585       tree dexpr = stream_read_tree (ib, data_in);
 586       if (dexpr)
 587         SET_DECL_DEBUG_EXPR (expr, dexpr);
 588     }
 589 }
 590
 591
 592 /* Read all pointer fields in the TS_DECL_NON_COMMON structure of
 593    EXPR from input block IB.  DATA_IN contains tables and descriptors for the
 594    file being read.  */
 595
 596 static void
 597 lto_input_ts_decl_non_common_tree_pointers (struct lto_input_block *ib,
 598                                             struct data_in *data_in, tree expr)
 599 {
 600   if (TREE_CODE (expr) == FUNCTION_DECL)
 601     {
 602       DECL_ARGUMENTS (expr) = stream_read_tree (ib, data_in);
 603       DECL_RESULT (expr) = stream_read_tree (ib, data_in);
 604     }
 605   else if (TREE_CODE (expr) == TYPE_DECL)
 606     DECL_ORIGINAL_TYPE (expr) = stream_read_tree (ib, data_in);
 607   DECL_VINDEX (expr) = stream_read_tree (ib, data_in);
 608 }
 609
 610
 611 /* Read all pointer fields in the TS_DECL_WITH_VIS structure of EXPR
 612    from input block IB.  DATA_IN contains tables and descriptors for the
 613    file being read.  */
 614
 615 static void
 616 lto_input_ts_decl_with_vis_tree_pointers (struct lto_input_block *ib,
 617                                           struct data_in *data_in, tree expr)
 618 {
 619   tree id;
 620
 621   id = stream_read_tree (ib, data_in);
 622   if (id)
 623     {
 624       gcc_assert (TREE_CODE (id) == IDENTIFIER_NODE);
 625       SET_DECL_ASSEMBLER_NAME (expr, id);
 626     }
 627
 628   DECL_SECTION_NAME (expr) = stream_read_tree (ib, data_in);
 629   DECL_COMDAT_GROUP (expr) = stream_read_tree (ib, data_in);
 630 }
 631
 632
 633 /* Read all pointer fields in the TS_FIELD_DECL structure of EXPR from
 634    input block IB.  DATA_IN contains tables and descriptors for the
 635    file being read.  */
 636
 637 static void
 638 lto_input_ts_field_decl_tree_pointers (struct lto_input_block *ib,
 639                                        struct data_in *data_in, tree expr)
 640 {
 641   DECL_FIELD_OFFSET (expr) = stream_read_tree (ib, data_in);
 642   DECL_BIT_FIELD_TYPE (expr) = stream_read_tree (ib, data_in);
 643   DECL_QUALIFIER (expr) = stream_read_tree (ib, data_in);
 644   DECL_FIELD_BIT_OFFSET (expr) = stream_read_tree (ib, data_in);
 645   DECL_FCONTEXT (expr) = stream_read_tree (ib, data_in);
 646   TREE_CHAIN (expr) = streamer_read_chain (ib, data_in);
 647 }
 648
 649
 650 /* Read all pointer fields in the TS_FUNCTION_DECL structure of EXPR
 651    from input block IB.  DATA_IN contains tables and descriptors for the
 652    file being read.  */
 653
 654 static void
 655 lto_input_ts_function_decl_tree_pointers (struct lto_input_block *ib,
 656                                           struct data_in *data_in, tree expr)
 657 {
 658   /* DECL_STRUCT_FUNCTION is handled by lto_input_function.  FIXME lto,
 659      maybe it should be handled here?  */
 660   DECL_FUNCTION_PERSONALITY (expr) = stream_read_tree (ib, data_in);
 661   DECL_FUNCTION_SPECIFIC_TARGET (expr) = stream_read_tree (ib, data_in);
 662   DECL_FUNCTION_SPECIFIC_OPTIMIZATION (expr) = stream_read_tree (ib, data_in);
 663
 664   /* If the file contains a function with an EH personality set,
 665      then it was compiled with -fexceptions.  In that case, initialize
 666      the backend EH machinery.  */
 667   if (DECL_FUNCTION_PERSONALITY (expr))
 668     lto_init_eh ();
 669 }
 670
 671
 672 /* Read all pointer fields in the TS_TYPE_COMMON structure of EXPR from
 673    input block IB.  DATA_IN contains tables and descriptors for the file
 674    being read.  */
 675
 676 static void
 677 lto_input_ts_type_common_tree_pointers (struct lto_input_block *ib,
 678                                         struct data_in *data_in, tree expr)
 679 {
 680   TYPE_SIZE (expr) = stream_read_tree (ib, data_in);
 681   TYPE_SIZE_UNIT (expr) = stream_read_tree (ib, data_in);
 682   TYPE_ATTRIBUTES (expr) = stream_read_tree (ib, data_in);
 683   TYPE_NAME (expr) = stream_read_tree (ib, data_in);
 684   /* Do not stream TYPE_POINTER_TO or TYPE_REFERENCE_TO.  They will be
 685      reconstructed during fixup.  */
 686   /* Do not stream TYPE_NEXT_VARIANT, we reconstruct the variant lists
 687      during fixup.  */
 688   TYPE_MAIN_VARIANT (expr) = stream_read_tree (ib, data_in);
 689   TYPE_CONTEXT (expr) = stream_read_tree (ib, data_in);
 690   /* TYPE_CANONICAL gets re-computed during type merging.  */
 691   TYPE_CANONICAL (expr) = NULL_TREE;
 692   TYPE_STUB_DECL (expr) = stream_read_tree (ib, data_in);
 693 }
 694
 695 /* Read all pointer fields in the TS_TYPE_NON_COMMON structure of EXPR
 696    from input block IB.  DATA_IN contains tables and descriptors for the
 697    file being read.  */
 698
 699 static void
 700 lto_input_ts_type_non_common_tree_pointers (struct lto_input_block *ib,
 701                                             struct data_in *data_in,
 702                                             tree expr)
 703 {
 704   if (TREE_CODE (expr) == ENUMERAL_TYPE)
 705     TYPE_VALUES (expr) = stream_read_tree (ib, data_in);
 706   else if (TREE_CODE (expr) == ARRAY_TYPE)
 707     TYPE_DOMAIN (expr) = stream_read_tree (ib, data_in);
 708   else if (RECORD_OR_UNION_TYPE_P (expr))
 709     TYPE_FIELDS (expr) = stream_read_tree (ib, data_in);
 710   else if (TREE_CODE (expr) == FUNCTION_TYPE
 711            || TREE_CODE (expr) == METHOD_TYPE)
 712     TYPE_ARG_TYPES (expr) = stream_read_tree (ib, data_in);
 713
 714   if (!POINTER_TYPE_P (expr))
 715     TYPE_MINVAL (expr) = stream_read_tree (ib, data_in);
 716   TYPE_MAXVAL (expr) = stream_read_tree (ib, data_in);
 717   if (RECORD_OR_UNION_TYPE_P (expr))
 718     TYPE_BINFO (expr) = stream_read_tree (ib, data_in);
 719 }
 720
 721
 722 /* Read all pointer fields in the TS_LIST structure of EXPR from input
 723    block IB.  DATA_IN contains tables and descriptors for the
 724    file being read.  */
 725
 726 static void
 727 lto_input_ts_list_tree_pointers (struct lto_input_block *ib,
 728                                  struct data_in *data_in, tree expr)
 729 {
 730   TREE_PURPOSE (expr) = stream_read_tree (ib, data_in);
 731   TREE_VALUE (expr) = stream_read_tree (ib, data_in);
 732   TREE_CHAIN (expr) = streamer_read_chain (ib, data_in);
 733 }
 734
 735
 736 /* Read all pointer fields in the TS_VEC structure of EXPR from input
 737    block IB.  DATA_IN contains tables and descriptors for the
 738    file being read.  */
 739
 740 static void
 741 lto_input_ts_vec_tree_pointers (struct lto_input_block *ib,
 742                                 struct data_in *data_in, tree expr)
 743 {
 744   int i;
 745
 746   /* Note that TREE_VEC_LENGTH was read by streamer_alloc_tree to
 747      instantiate EXPR.  */
 748   for (i = 0; i < TREE_VEC_LENGTH (expr); i++)
 749     TREE_VEC_ELT (expr, i) = stream_read_tree (ib, data_in);
 750 }
 751
 752
 753 /* Read all pointer fields in the TS_EXP structure of EXPR from input
 754    block IB.  DATA_IN contains tables and descriptors for the
 755    file being read.  */
 756
 757
 758 static void
 759 lto_input_ts_exp_tree_pointers (struct lto_input_block *ib,
 760                                 struct data_in *data_in, tree expr)
 761 {
 762   int i, length;
 763   location_t loc;
 764
 765   length = streamer_read_hwi (ib);
 766   gcc_assert (length == TREE_OPERAND_LENGTH (expr));
 767
 768   for (i = 0; i < length; i++)
 769     TREE_OPERAND (expr, i) = stream_read_tree (ib, data_in);
 770
 771   loc = lto_input_location (ib, data_in);
 772   SET_EXPR_LOCATION (expr, loc);
 773   TREE_BLOCK (expr) = stream_read_tree (ib, data_in);
 774 }
 775
 776
 777 /* Read all pointer fields in the TS_BLOCK structure of EXPR from input
 778    block IB.  DATA_IN contains tables and descriptors for the
 779    file being read.  */
 780
 781 static void
 782 lto_input_ts_block_tree_pointers (struct lto_input_block *ib,
 783                                   struct data_in *data_in, tree expr)
 784 {
 785   /* Do not stream BLOCK_SOURCE_LOCATION.  We cannot handle debug information
 786      for early inlining so drop it on the floor instead of ICEing in
 787      dwarf2out.c.  */
 788   BLOCK_VARS (expr) = streamer_read_chain (ib, data_in);
 789
 790   /* Do not stream BLOCK_NONLOCALIZED_VARS.  We cannot handle debug information
 791      for early inlining so drop it on the floor instead of ICEing in
 792      dwarf2out.c.  */
 793
 794   BLOCK_SUPERCONTEXT (expr) = stream_read_tree (ib, data_in);
 795
 796   /* Do not stream BLOCK_ABSTRACT_ORIGIN.  We cannot handle debug information
 797      for early inlining so drop it on the floor instead of ICEing in
 798      dwarf2out.c.  */
 799   BLOCK_FRAGMENT_ORIGIN (expr) = stream_read_tree (ib, data_in);
 800   BLOCK_FRAGMENT_CHAIN (expr) = stream_read_tree (ib, data_in);
 801
 802   /* We re-compute BLOCK_SUBBLOCKS of our parent here instead
 803      of streaming it.  For non-BLOCK BLOCK_SUPERCONTEXTs we still
 804      stream the child relationship explicitly.  */
 805   if (BLOCK_SUPERCONTEXT (expr)
 806       && TREE_CODE (BLOCK_SUPERCONTEXT (expr)) == BLOCK)
 807     {
 808       BLOCK_CHAIN (expr) = BLOCK_SUBBLOCKS (BLOCK_SUPERCONTEXT (expr));
 809       BLOCK_SUBBLOCKS (BLOCK_SUPERCONTEXT (expr)) = expr;
 810     }
 811
 812   /* The global block is rooted at the TU decl.  Hook it here to
 813      avoid the need to stream in this block during WPA time.  */
 814   else if (BLOCK_SUPERCONTEXT (expr)
 815            && TREE_CODE (BLOCK_SUPERCONTEXT (expr)) == TRANSLATION_UNIT_DECL)
 816     DECL_INITIAL (BLOCK_SUPERCONTEXT (expr)) = expr;
 817
 818   /* The function-level block is connected at the time we read in
 819      function bodies for the same reason.  */
 820 }
 821
 822
 823 /* Read all pointer fields in the TS_BINFO structure of EXPR from input
 824    block IB.  DATA_IN contains tables and descriptors for the
 825    file being read.  */
 826
 827 static void
 828 lto_input_ts_binfo_tree_pointers (struct lto_input_block *ib,
 829                                   struct data_in *data_in, tree expr)
 830 {
 831   unsigned i, len;
 832   tree t;
 833
 834   /* Note that the number of slots in EXPR was read in
 835      streamer_alloc_tree when instantiating EXPR.  However, the
 836      vector is empty so we cannot rely on VEC_length to know how many
 837      elements to read.  So, this list is emitted as a 0-terminated
 838      list on the writer side.  */
 839   do
 840     {
 841       t = stream_read_tree (ib, data_in);
 842       if (t)
 843         VEC_quick_push (tree, BINFO_BASE_BINFOS (expr), t);
 844     }
 845   while (t);
 846
 847   BINFO_OFFSET (expr) = stream_read_tree (ib, data_in);
 848   BINFO_VTABLE (expr) = stream_read_tree (ib, data_in);
 849   BINFO_VPTR_FIELD (expr) = stream_read_tree (ib, data_in);
 850
 851   len = streamer_read_uhwi (ib);
 852   if (len > 0)
 853     {
 854       VEC_reserve_exact (tree, gc, BINFO_BASE_ACCESSES (expr), len);
 855       for (i = 0; i < len; i++)
 856         {
 857           tree a = stream_read_tree (ib, data_in);
 858           VEC_quick_push (tree, BINFO_BASE_ACCESSES (expr), a);
 859         }
 860     }
 861
 862   BINFO_INHERITANCE_CHAIN (expr) = stream_read_tree (ib, data_in);
 863   BINFO_SUBVTT_INDEX (expr) = stream_read_tree (ib, data_in);
 864   BINFO_VPTR_INDEX (expr) = stream_read_tree (ib, data_in);
 865 }
 866
 867
 868 /* Read all pointer fields in the TS_CONSTRUCTOR structure of EXPR from
 869    input block IB.  DATA_IN contains tables and descriptors for the
 870    file being read.  */
 871
 872 static void
 873 lto_input_ts_constructor_tree_pointers (struct lto_input_block *ib,
 874                                         struct data_in *data_in, tree expr)
 875 {
 876   unsigned i, len;
 877
 878   len = streamer_read_uhwi (ib);
 879   for (i = 0; i < len; i++)
 880     {
 881       tree index, value;
 882
 883       index = stream_read_tree (ib, data_in);
 884       value = stream_read_tree (ib, data_in);
 885       CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (expr), index, value);
 886     }
 887 }
 888
 889
 890 /* Input a TS_TARGET_OPTION tree from IB into EXPR.  */
 891
 892 static void
 893 lto_input_ts_target_option (struct lto_input_block *ib, tree expr)
 894 {
 895   unsigned i, len;
 896   struct bitpack_d bp;
 897   struct cl_target_option *t = TREE_TARGET_OPTION (expr);
 898
 899   bp = streamer_read_bitpack (ib);
 900   len = sizeof (struct cl_target_option);
 901   for (i = 0; i < len; i++)
 902     ((unsigned char *)t)[i] = bp_unpack_value (&bp, 8);
 903   if (bp_unpack_value (&bp, 32) != 0x12345678)
 904     fatal_error ("cl_target_option size mismatch in LTO reader and writer");
 905 }
 906
 907 /* Input a TS_TRANSLATION_UNIT_DECL tree from IB and DATA_IN into EXPR.  */
 908
 909 static void
 910 lto_input_ts_translation_unit_decl_tree_pointers (struct lto_input_block *ib,
 911                                                   struct data_in *data_in,
 912                                                   tree expr)
 913 {
 914   TRANSLATION_UNIT_LANGUAGE (expr) = xstrdup (streamer_read_string (data_in, ib));
 915   VEC_safe_push (tree, gc, all_translation_units, expr);
 916 }
 917
 918 /* Read all pointer fields in EXPR from input block IB.  DATA_IN
 919    contains tables and descriptors for the file being read.  */
 920
 921 void
 922 streamer_read_tree_body (struct lto_input_block *ib, struct data_in *data_in,
 923                          tree expr)
 924 {
 925   enum tree_code code;
 926
 927   code = TREE_CODE (expr);
 928
 929   if (CODE_CONTAINS_STRUCT (code, TS_TYPED))
 930     lto_input_ts_common_tree_pointers (ib, data_in, expr);
 931
 932   if (CODE_CONTAINS_STRUCT (code, TS_VECTOR))
 933     lto_input_ts_vector_tree_pointers (ib, data_in, expr);
 934
 935   if (CODE_CONTAINS_STRUCT (code, TS_COMPLEX))
 936     lto_input_ts_complex_tree_pointers (ib, data_in, expr);
 937
 938   if (CODE_CONTAINS_STRUCT (code, TS_DECL_MINIMAL))
 939     lto_input_ts_decl_minimal_tree_pointers (ib, data_in, expr);
 940
 941   if (CODE_CONTAINS_STRUCT (code, TS_DECL_COMMON))
 942     lto_input_ts_decl_common_tree_pointers (ib, data_in, expr);
 943
 944   if (CODE_CONTAINS_STRUCT (code, TS_DECL_NON_COMMON))
 945     lto_input_ts_decl_non_common_tree_pointers (ib, data_in, expr);
 946
 947   if (CODE_CONTAINS_STRUCT (code, TS_DECL_WITH_VIS))
 948     lto_input_ts_decl_with_vis_tree_pointers (ib, data_in, expr);
 949
 950   if (CODE_CONTAINS_STRUCT (code, TS_FIELD_DECL))
 951     lto_input_ts_field_decl_tree_pointers (ib, data_in, expr);
 952
 953   if (CODE_CONTAINS_STRUCT (code, TS_FUNCTION_DECL))
 954     lto_input_ts_function_decl_tree_pointers (ib, data_in, expr);
 955
 956   if (CODE_CONTAINS_STRUCT (code, TS_TYPE_COMMON))
 957     lto_input_ts_type_common_tree_pointers (ib, data_in, expr);
 958
 959   if (CODE_CONTAINS_STRUCT (code, TS_TYPE_NON_COMMON))
 960     lto_input_ts_type_non_common_tree_pointers (ib, data_in, expr);
 961
 962   if (CODE_CONTAINS_STRUCT (code, TS_LIST))
 963     lto_input_ts_list_tree_pointers (ib, data_in, expr);
 964
 965   if (CODE_CONTAINS_STRUCT (code, TS_VEC))
 966     lto_input_ts_vec_tree_pointers (ib, data_in, expr);
 967
 968   if (CODE_CONTAINS_STRUCT (code, TS_EXP))
 969     lto_input_ts_exp_tree_pointers (ib, data_in, expr);
 970
 971   if (CODE_CONTAINS_STRUCT (code, TS_BLOCK))
 972     lto_input_ts_block_tree_pointers (ib, data_in, expr);
 973
 974   if (CODE_CONTAINS_STRUCT (code, TS_BINFO))
 975     lto_input_ts_binfo_tree_pointers (ib, data_in, expr);
 976
 977   if (CODE_CONTAINS_STRUCT (code, TS_CONSTRUCTOR))
 978     lto_input_ts_constructor_tree_pointers (ib, data_in, expr);
 979
 980   if (CODE_CONTAINS_STRUCT (code, TS_TARGET_OPTION))
 981     lto_input_ts_target_option (ib, expr);
 982
 983   if (CODE_CONTAINS_STRUCT (code, TS_TRANSLATION_UNIT_DECL))
 984     lto_input_ts_translation_unit_decl_tree_pointers (ib, data_in, expr);
 985 }
 986
 987
 988 /* Read and INTEGER_CST node from input block IB using the per-file
 989    context in DATA_IN.  */
 990
 991 tree
 992 streamer_read_integer_cst (struct lto_input_block *ib, struct data_in *data_in)
 993 {
 994   tree result, type;
 995   HOST_WIDE_INT low, high;
 996   bool overflow_p;
 997
 998   type = stream_read_tree (ib, data_in);
 999   overflow_p = (streamer_read_uchar (ib) != 0);
1000   low = streamer_read_uhwi (ib);
1001   high = streamer_read_uhwi (ib);
1002   result = build_int_cst_wide (type, low, high);
1003
1004   /* If the original constant had overflown, build a replica of RESULT to
1005      avoid modifying the shared constant returned by build_int_cst_wide.  */
1006   if (overflow_p)
1007     {
1008       result = copy_node (result);
1009       TREE_OVERFLOW (result) = 1;
1010     }
1011
1012   return result;
1013 }
1014
1015
1016 /* Read an index IX from input block IB and return the tree node at
1017    DATA_IN->FILE_DATA->GLOBALS_INDEX[IX].  */
1018
1019 tree
1020 streamer_get_pickled_tree (struct lto_input_block *ib, struct data_in *data_in)
1021 {
1022   unsigned HOST_WIDE_INT ix;
1023   tree result;
1024   enum LTO_tags expected_tag;
1025
1026   ix = streamer_read_uhwi (ib);
1027   expected_tag = streamer_read_enum (ib, LTO_tags, LTO_NUM_TAGS);
1028
1029   result = streamer_tree_cache_get (data_in->reader_cache, ix);
1030   gcc_assert (result
1031               && TREE_CODE (result) == lto_tag_to_tree_code (expected_tag));
1032
1033   return result;
1034 }
1035
1036
1037 /* Read a code and class from input block IB and return the
1038    corresponding builtin.  DATA_IN is as in stream_read_tree.  */
1039
1040 tree
1041 streamer_get_builtin_tree (struct lto_input_block *ib, struct data_in *data_in)
1042 {
1043   enum built_in_class fclass;
1044   enum built_in_function fcode;
1045   const char *asmname;
1046   tree result;
1047
1048   fclass = streamer_read_enum (ib, built_in_class, BUILT_IN_LAST);
1049   gcc_assert (fclass == BUILT_IN_NORMAL || fclass == BUILT_IN_MD);
1050
1051   fcode = (enum built_in_function) streamer_read_uhwi (ib);
1052
1053   if (fclass == BUILT_IN_NORMAL)
1054     {
1055       if (fcode >= END_BUILTINS)
1056         fatal_error ("machine independent builtin code out of range");
1057       result = builtin_decl_explicit (fcode);
1058       gcc_assert (result);
1059     }
1060   else if (fclass == BUILT_IN_MD)
1061     {
1062       result = targetm.builtin_decl (fcode, true);
1063       if (!result || result == error_mark_node)
1064         fatal_error ("target specific builtin not available");
1065     }
1066   else
1067     gcc_unreachable ();
1068
1069   asmname = streamer_read_string (data_in, ib);
1070   if (asmname)
1071     set_builtin_user_assembler_name (result, asmname);
1072
1073   streamer_tree_cache_append (data_in->reader_cache, result);
1074
1075   return result;
1076 }