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