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