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   else if (TREE_CODE (expr) == ARRAY_TYPE)
 338     TYPE_NONALIASED_COMPONENT (expr) = (unsigned) bp_unpack_value (bp, 1);
 339   TYPE_PACKED (expr) = (unsigned) bp_unpack_value (bp, 1);
 340   TYPE_RESTRICT (expr) = (unsigned) bp_unpack_value (bp, 1);
 341   TYPE_CONTAINS_PLACEHOLDER_INTERNAL (expr)
 342         = (unsigned) bp_unpack_value (bp, 2);
 343   TYPE_USER_ALIGN (expr) = (unsigned) bp_unpack_value (bp, 1);
 344   TYPE_READONLY (expr) = (unsigned) bp_unpack_value (bp, 1);
 345   TYPE_PRECISION (expr) = bp_unpack_var_len_unsigned (bp);
 346   TYPE_ALIGN (expr) = bp_unpack_var_len_unsigned (bp);
 347   TYPE_ALIAS_SET (expr) = bp_unpack_var_len_int (bp);
 348 }
 349
 350
 351 /* Unpack all the non-pointer fields of the TS_BLOCK structure
 352    of expression EXPR from bitpack BP.  */
 353
 354 static void
 355 unpack_ts_block_value_fields (struct bitpack_d *bp, tree expr)
 356 {
 357   BLOCK_ABSTRACT (expr) = (unsigned) bp_unpack_value (bp, 1);
 358   /* BLOCK_NUMBER is recomputed.  */
 359 }
 360
 361 /* Unpack all the non-pointer fields of the TS_TRANSLATION_UNIT_DECL
 362    structure of expression EXPR from bitpack BP.  */
 363
 364 static void
 365 unpack_ts_translation_unit_decl_value_fields (struct bitpack_d *bp ATTRIBUTE_UNUSED, tree expr ATTRIBUTE_UNUSED)
 366 {
 367 }
 368
 369 /* Unpack all the non-pointer fields in EXPR into a bit pack.  */
 370
 371 static void
 372 unpack_value_fields (struct bitpack_d *bp, tree expr)
 373 {
 374   enum tree_code code;
 375
 376   code = TREE_CODE (expr);
 377
 378   /* Note that all these functions are highly sensitive to changes in
 379      the types and sizes of each of the fields being packed.  */
 380   unpack_ts_base_value_fields (bp, expr);
 381
 382   if (CODE_CONTAINS_STRUCT (code, TS_REAL_CST))
 383     unpack_ts_real_cst_value_fields (bp, expr);
 384
 385   if (CODE_CONTAINS_STRUCT (code, TS_FIXED_CST))
 386     unpack_ts_fixed_cst_value_fields (bp, expr);
 387
 388   if (CODE_CONTAINS_STRUCT (code, TS_DECL_COMMON))
 389     unpack_ts_decl_common_value_fields (bp, expr);
 390
 391   if (CODE_CONTAINS_STRUCT (code, TS_DECL_WRTL))
 392     unpack_ts_decl_wrtl_value_fields (bp, expr);
 393
 394   if (CODE_CONTAINS_STRUCT (code, TS_DECL_WITH_VIS))
 395     unpack_ts_decl_with_vis_value_fields (bp, expr);
 396
 397   if (CODE_CONTAINS_STRUCT (code, TS_FUNCTION_DECL))
 398     unpack_ts_function_decl_value_fields (bp, expr);
 399
 400   if (CODE_CONTAINS_STRUCT (code, TS_TYPE_COMMON))
 401     unpack_ts_type_common_value_fields (bp, expr);
 402
 403   if (CODE_CONTAINS_STRUCT (code, TS_BLOCK))
 404     unpack_ts_block_value_fields (bp, expr);
 405
 406   if (CODE_CONTAINS_STRUCT (code, TS_TRANSLATION_UNIT_DECL))
 407     unpack_ts_translation_unit_decl_value_fields (bp, expr);
 408 }
 409
 410
 411 /* Read all the language-independent bitfield values for EXPR from IB.
 412    Return the partially unpacked bitpack so the caller can unpack any other
 413    bitfield values that the writer may have written.  */
 414
 415 struct bitpack_d
 416 streamer_read_tree_bitfields (struct lto_input_block *ib, tree expr)
 417 {
 418   enum tree_code code;
 419   struct bitpack_d bp;
 420
 421   /* Read the bitpack of non-pointer values from IB.  */
 422   bp = streamer_read_bitpack (ib);
 423
 424   /* The first word in BP contains the code of the tree that we
 425      are about to read.  */
 426   code = (enum tree_code) bp_unpack_value (&bp, 16);
 427   lto_tag_check (lto_tree_code_to_tag (code),
 428                  lto_tree_code_to_tag (TREE_CODE (expr)));
 429
 430   /* Unpack all the value fields from BP.  */
 431   unpack_value_fields (&bp, expr);
 432
 433   return bp;
 434 }
 435
 436
 437 /* Materialize a new tree from input block IB using descriptors in
 438    DATA_IN.  The code for the new tree should match TAG.  Store in
 439    *IX_P the index into the reader cache where the new tree is stored.  */
 440
 441 tree
 442 streamer_alloc_tree (struct lto_input_block *ib, struct data_in *data_in,
 443                      enum LTO_tags tag)
 444 {
 445   enum tree_code code;
 446   tree result;
 447 #ifdef LTO_STREAMER_DEBUG
 448   HOST_WIDEST_INT orig_address_in_writer;
 449 #endif
 450
 451   result = NULL_TREE;
 452
 453 #ifdef LTO_STREAMER_DEBUG
 454   /* Read the word representing the memory address for the tree
 455      as it was written by the writer.  This is useful when
 456      debugging differences between the writer and reader.  */
 457   orig_address_in_writer = streamer_read_hwi (ib);
 458   gcc_assert ((intptr_t) orig_address_in_writer == orig_address_in_writer);
 459 #endif
 460
 461   code = lto_tag_to_tree_code (tag);
 462
 463   /* We should never see an SSA_NAME tree.  Only the version numbers of
 464      SSA names are ever written out.  See input_ssa_names.  */
 465   gcc_assert (code != SSA_NAME);
 466
 467   /* Instantiate a new tree using the header data.  */
 468   if (CODE_CONTAINS_STRUCT (code, TS_STRING))
 469     result = streamer_read_string_cst (data_in, ib);
 470   else if (CODE_CONTAINS_STRUCT (code, TS_IDENTIFIER))
 471     result = input_identifier (data_in, ib);
 472   else if (CODE_CONTAINS_STRUCT (code, TS_VEC))
 473     {
 474       HOST_WIDE_INT len = streamer_read_hwi (ib);
 475       result = make_tree_vec (len);
 476     }
 477   else if (CODE_CONTAINS_STRUCT (code, TS_VECTOR))
 478     {
 479       HOST_WIDE_INT len = streamer_read_hwi (ib);
 480       result = make_vector (len);
 481     }
 482   else if (CODE_CONTAINS_STRUCT (code, TS_BINFO))
 483     {
 484       unsigned HOST_WIDE_INT len = streamer_read_uhwi (ib);
 485       result = make_tree_binfo (len);
 486     }
 487   else if (code == CALL_EXPR)
 488     {
 489       unsigned HOST_WIDE_INT nargs = streamer_read_uhwi (ib);
 490       return build_vl_exp (CALL_EXPR, nargs + 3);
 491     }
 492   else
 493     {
 494       /* For all other nodes, materialize the tree with a raw
 495          make_node call.  */
 496       result = make_node (code);
 497     }
 498
 499 #ifdef LTO_STREAMER_DEBUG
 500   /* Store the original address of the tree as seen by the writer
 501      in RESULT's aux field.  This is useful when debugging streaming
 502      problems.  This way, a debugging session can be started on
 503      both writer and reader with a breakpoint using this address
 504      value in both.  */
 505   lto_orig_address_map (result, (intptr_t) orig_address_in_writer);
 506 #endif
 507
 508   return result;
 509 }
 510
 511
 512 /* Read all pointer fields in the TS_COMMON structure of EXPR from input
 513    block IB.  DATA_IN contains tables and descriptors for the
 514    file being read.  */
 515
 516
 517 static void
 518 lto_input_ts_common_tree_pointers (struct lto_input_block *ib,
 519                                    struct data_in *data_in, tree expr)
 520 {
 521   if (TREE_CODE (expr) != IDENTIFIER_NODE)
 522     TREE_TYPE (expr) = stream_read_tree (ib, data_in);
 523 }
 524
 525
 526 /* Read all pointer fields in the TS_VECTOR structure of EXPR from input
 527    block IB.  DATA_IN contains tables and descriptors for the
 528    file being read.  */
 529
 530 static void
 531 lto_input_ts_vector_tree_pointers (struct lto_input_block *ib,
 532                                    struct data_in *data_in, tree expr)
 533 {
 534   unsigned i;
 535   for (i = 0; i < VECTOR_CST_NELTS (expr); ++i)
 536     VECTOR_CST_ELT (expr, i) = stream_read_tree (ib, data_in);
 537 }
 538
 539
 540 /* Read all pointer fields in the TS_COMPLEX structure of EXPR from input
 541    block IB.  DATA_IN contains tables and descriptors for the
 542    file being read.  */
 543
 544 static void
 545 lto_input_ts_complex_tree_pointers (struct lto_input_block *ib,
 546                                     struct data_in *data_in, tree expr)
 547 {
 548   TREE_REALPART (expr) = stream_read_tree (ib, data_in);
 549   TREE_IMAGPART (expr) = stream_read_tree (ib, data_in);
 550 }
 551
 552
 553 /* Read all pointer fields in the TS_DECL_MINIMAL structure of EXPR
 554    from input block IB.  DATA_IN contains tables and descriptors for the
 555    file being read.  */
 556
 557 static void
 558 lto_input_ts_decl_minimal_tree_pointers (struct lto_input_block *ib,
 559                                          struct data_in *data_in, tree expr)
 560 {
 561   DECL_NAME (expr) = stream_read_tree (ib, data_in);
 562   DECL_CONTEXT (expr) = stream_read_tree (ib, data_in);
 563   DECL_SOURCE_LOCATION (expr) = lto_input_location (ib, data_in);
 564 }
 565
 566
 567 /* Read all pointer fields in the TS_DECL_COMMON structure of EXPR from
 568    input block IB.  DATA_IN contains tables and descriptors for the
 569    file being read.  */
 570
 571 static void
 572 lto_input_ts_decl_common_tree_pointers (struct lto_input_block *ib,
 573                                         struct data_in *data_in, tree expr)
 574 {
 575   DECL_SIZE (expr) = stream_read_tree (ib, data_in);
 576   DECL_SIZE_UNIT (expr) = stream_read_tree (ib, data_in);
 577   DECL_ATTRIBUTES (expr) = stream_read_tree (ib, data_in);
 578
 579   /* Do not stream DECL_ABSTRACT_ORIGIN.  We cannot handle debug information
 580      for early inlining so drop it on the floor instead of ICEing in
 581      dwarf2out.c.  */
 582
 583   if (TREE_CODE (expr) == PARM_DECL)
 584     TREE_CHAIN (expr) = streamer_read_chain (ib, data_in);
 585
 586   if ((TREE_CODE (expr) == VAR_DECL
 587        || TREE_CODE (expr) == PARM_DECL)
 588       && DECL_HAS_VALUE_EXPR_P (expr))
 589     SET_DECL_VALUE_EXPR (expr, stream_read_tree (ib, data_in));
 590
 591   if (TREE_CODE (expr) == VAR_DECL)
 592     {
 593       tree dexpr = stream_read_tree (ib, data_in);
 594       if (dexpr)
 595         SET_DECL_DEBUG_EXPR (expr, dexpr);
 596     }
 597 }
 598
 599
 600 /* Read all pointer fields in the TS_DECL_NON_COMMON structure of
 601    EXPR from input block IB.  DATA_IN contains tables and descriptors for the
 602    file being read.  */
 603
 604 static void
 605 lto_input_ts_decl_non_common_tree_pointers (struct lto_input_block *ib,
 606                                             struct data_in *data_in, tree expr)
 607 {
 608   if (TREE_CODE (expr) == FUNCTION_DECL)
 609     {
 610       DECL_ARGUMENTS (expr) = stream_read_tree (ib, data_in);
 611       DECL_RESULT (expr) = stream_read_tree (ib, data_in);
 612     }
 613   else if (TREE_CODE (expr) == TYPE_DECL)
 614     DECL_ORIGINAL_TYPE (expr) = stream_read_tree (ib, data_in);
 615   DECL_VINDEX (expr) = stream_read_tree (ib, data_in);
 616 }
 617
 618
 619 /* Read all pointer fields in the TS_DECL_WITH_VIS structure of EXPR
 620    from input block IB.  DATA_IN contains tables and descriptors for the
 621    file being read.  */
 622
 623 static void
 624 lto_input_ts_decl_with_vis_tree_pointers (struct lto_input_block *ib,
 625                                           struct data_in *data_in, tree expr)
 626 {
 627   tree id;
 628
 629   id = stream_read_tree (ib, data_in);
 630   if (id)
 631     {
 632       gcc_assert (TREE_CODE (id) == IDENTIFIER_NODE);
 633       SET_DECL_ASSEMBLER_NAME (expr, id);
 634     }
 635
 636   DECL_SECTION_NAME (expr) = stream_read_tree (ib, data_in);
 637   DECL_COMDAT_GROUP (expr) = stream_read_tree (ib, data_in);
 638 }
 639
 640
 641 /* Read all pointer fields in the TS_FIELD_DECL structure of EXPR from
 642    input block IB.  DATA_IN contains tables and descriptors for the
 643    file being read.  */
 644
 645 static void
 646 lto_input_ts_field_decl_tree_pointers (struct lto_input_block *ib,
 647                                        struct data_in *data_in, tree expr)
 648 {
 649   DECL_FIELD_OFFSET (expr) = stream_read_tree (ib, data_in);
 650   DECL_BIT_FIELD_TYPE (expr) = stream_read_tree (ib, data_in);
 651   DECL_BIT_FIELD_REPRESENTATIVE (expr) = stream_read_tree (ib, data_in);
 652   DECL_FIELD_BIT_OFFSET (expr) = stream_read_tree (ib, data_in);
 653   DECL_FCONTEXT (expr) = stream_read_tree (ib, data_in);
 654 }
 655
 656
 657 /* Read all pointer fields in the TS_FUNCTION_DECL structure of EXPR
 658    from input block IB.  DATA_IN contains tables and descriptors for the
 659    file being read.  */
 660
 661 static void
 662 lto_input_ts_function_decl_tree_pointers (struct lto_input_block *ib,
 663                                           struct data_in *data_in, tree expr)
 664 {
 665   /* DECL_STRUCT_FUNCTION is handled by lto_input_function.  FIXME lto,
 666      maybe it should be handled here?  */
 667   DECL_FUNCTION_PERSONALITY (expr) = stream_read_tree (ib, data_in);
 668   DECL_FUNCTION_SPECIFIC_TARGET (expr) = stream_read_tree (ib, data_in);
 669   DECL_FUNCTION_SPECIFIC_OPTIMIZATION (expr) = stream_read_tree (ib, data_in);
 670
 671   /* If the file contains a function with an EH personality set,
 672      then it was compiled with -fexceptions.  In that case, initialize
 673      the backend EH machinery.  */
 674   if (DECL_FUNCTION_PERSONALITY (expr))
 675     lto_init_eh ();
 676 }
 677
 678
 679 /* Read all pointer fields in the TS_TYPE_COMMON structure of EXPR from
 680    input block IB.  DATA_IN contains tables and descriptors for the file
 681    being read.  */
 682
 683 static void
 684 lto_input_ts_type_common_tree_pointers (struct lto_input_block *ib,
 685                                         struct data_in *data_in, tree expr)
 686 {
 687   TYPE_SIZE (expr) = stream_read_tree (ib, data_in);
 688   TYPE_SIZE_UNIT (expr) = stream_read_tree (ib, data_in);
 689   TYPE_ATTRIBUTES (expr) = stream_read_tree (ib, data_in);
 690   TYPE_NAME (expr) = stream_read_tree (ib, data_in);
 691   /* Do not stream TYPE_POINTER_TO or TYPE_REFERENCE_TO.  They will be
 692      reconstructed during fixup.  */
 693   /* Do not stream TYPE_NEXT_VARIANT, we reconstruct the variant lists
 694      during fixup.  */
 695   TYPE_MAIN_VARIANT (expr) = stream_read_tree (ib, data_in);
 696   TYPE_CONTEXT (expr) = stream_read_tree (ib, data_in);
 697   /* TYPE_CANONICAL gets re-computed during type merging.  */
 698   TYPE_CANONICAL (expr) = NULL_TREE;
 699   TYPE_STUB_DECL (expr) = stream_read_tree (ib, data_in);
 700 }
 701
 702 /* Read all pointer fields in the TS_TYPE_NON_COMMON structure of EXPR
 703    from input block IB.  DATA_IN contains tables and descriptors for the
 704    file being read.  */
 705
 706 static void
 707 lto_input_ts_type_non_common_tree_pointers (struct lto_input_block *ib,
 708                                             struct data_in *data_in,
 709                                             tree expr)
 710 {
 711   if (TREE_CODE (expr) == ENUMERAL_TYPE)
 712     TYPE_VALUES (expr) = stream_read_tree (ib, data_in);
 713   else if (TREE_CODE (expr) == ARRAY_TYPE)
 714     TYPE_DOMAIN (expr) = stream_read_tree (ib, data_in);
 715   else if (RECORD_OR_UNION_TYPE_P (expr))
 716     TYPE_FIELDS (expr) = streamer_read_chain (ib, data_in);
 717   else if (TREE_CODE (expr) == FUNCTION_TYPE
 718            || TREE_CODE (expr) == METHOD_TYPE)
 719     TYPE_ARG_TYPES (expr) = stream_read_tree (ib, data_in);
 720
 721   if (!POINTER_TYPE_P (expr))
 722     TYPE_MINVAL (expr) = stream_read_tree (ib, data_in);
 723   TYPE_MAXVAL (expr) = stream_read_tree (ib, data_in);
 724   if (RECORD_OR_UNION_TYPE_P (expr))
 725     TYPE_BINFO (expr) = stream_read_tree (ib, data_in);
 726 }
 727
 728
 729 /* Read all pointer fields in the TS_LIST structure of EXPR from input
 730    block IB.  DATA_IN contains tables and descriptors for the
 731    file being read.  */
 732
 733 static void
 734 lto_input_ts_list_tree_pointers (struct lto_input_block *ib,
 735                                  struct data_in *data_in, tree expr)
 736 {
 737   TREE_PURPOSE (expr) = stream_read_tree (ib, data_in);
 738   TREE_VALUE (expr) = stream_read_tree (ib, data_in);
 739   TREE_CHAIN (expr) = streamer_read_chain (ib, data_in);
 740 }
 741
 742
 743 /* Read all pointer fields in the TS_VEC structure of EXPR from input
 744    block IB.  DATA_IN contains tables and descriptors for the
 745    file being read.  */
 746
 747 static void
 748 lto_input_ts_vec_tree_pointers (struct lto_input_block *ib,
 749                                 struct data_in *data_in, tree expr)
 750 {
 751   int i;
 752
 753   /* Note that TREE_VEC_LENGTH was read by streamer_alloc_tree to
 754      instantiate EXPR.  */
 755   for (i = 0; i < TREE_VEC_LENGTH (expr); i++)
 756     TREE_VEC_ELT (expr, i) = stream_read_tree (ib, data_in);
 757 }
 758
 759
 760 /* Read all pointer fields in the TS_EXP structure of EXPR from input
 761    block IB.  DATA_IN contains tables and descriptors for the
 762    file being read.  */
 763
 764
 765 static void
 766 lto_input_ts_exp_tree_pointers (struct lto_input_block *ib,
 767                                 struct data_in *data_in, tree expr)
 768 {
 769   int i, length;
 770   location_t loc;
 771
 772   length = streamer_read_hwi (ib);
 773   gcc_assert (length == TREE_OPERAND_LENGTH (expr));
 774
 775   for (i = 0; i < length; i++)
 776     TREE_OPERAND (expr, i) = stream_read_tree (ib, data_in);
 777
 778   loc = lto_input_location (ib, data_in);
 779   SET_EXPR_LOCATION (expr, loc);
 780   TREE_SET_BLOCK (expr, stream_read_tree (ib, data_in));
 781 }
 782
 783
 784 /* Read all pointer fields in the TS_BLOCK structure of EXPR from input
 785    block IB.  DATA_IN contains tables and descriptors for the
 786    file being read.  */
 787
 788 static void
 789 lto_input_ts_block_tree_pointers (struct lto_input_block *ib,
 790                                   struct data_in *data_in, tree expr)
 791 {
 792   /* Do not stream BLOCK_SOURCE_LOCATION.  We cannot handle debug information
 793      for early inlining so drop it on the floor instead of ICEing in
 794      dwarf2out.c.  */
 795   BLOCK_VARS (expr) = streamer_read_chain (ib, data_in);
 796
 797   /* Do not stream BLOCK_NONLOCALIZED_VARS.  We cannot handle debug information
 798      for early inlining so drop it on the floor instead of ICEing in
 799      dwarf2out.c.  */
 800
 801   BLOCK_SUPERCONTEXT (expr) = stream_read_tree (ib, data_in);
 802
 803   /* Do not stream BLOCK_ABSTRACT_ORIGIN.  We cannot handle debug information
 804      for early inlining so drop it on the floor instead of ICEing in
 805      dwarf2out.c.  */
 806   BLOCK_FRAGMENT_ORIGIN (expr) = stream_read_tree (ib, data_in);
 807   BLOCK_FRAGMENT_CHAIN (expr) = stream_read_tree (ib, data_in);
 808
 809   /* We re-compute BLOCK_SUBBLOCKS of our parent here instead
 810      of streaming it.  For non-BLOCK BLOCK_SUPERCONTEXTs we still
 811      stream the child relationship explicitly.  */
 812   if (BLOCK_SUPERCONTEXT (expr)
 813       && TREE_CODE (BLOCK_SUPERCONTEXT (expr)) == BLOCK)
 814     {
 815       BLOCK_CHAIN (expr) = BLOCK_SUBBLOCKS (BLOCK_SUPERCONTEXT (expr));
 816       BLOCK_SUBBLOCKS (BLOCK_SUPERCONTEXT (expr)) = expr;
 817     }
 818
 819   /* The global block is rooted at the TU decl.  Hook it here to
 820      avoid the need to stream in this block during WPA time.  */
 821   else if (BLOCK_SUPERCONTEXT (expr)
 822            && TREE_CODE (BLOCK_SUPERCONTEXT (expr)) == TRANSLATION_UNIT_DECL)
 823     DECL_INITIAL (BLOCK_SUPERCONTEXT (expr)) = expr;
 824
 825   /* The function-level block is connected at the time we read in
 826      function bodies for the same reason.  */
 827 }
 828
 829
 830 /* Read all pointer fields in the TS_BINFO structure of EXPR from input
 831    block IB.  DATA_IN contains tables and descriptors for the
 832    file being read.  */
 833
 834 static void
 835 lto_input_ts_binfo_tree_pointers (struct lto_input_block *ib,
 836                                   struct data_in *data_in, tree expr)
 837 {
 838   unsigned i, len;
 839   tree t;
 840
 841   /* Note that the number of slots in EXPR was read in
 842      streamer_alloc_tree when instantiating EXPR.  However, the
 843      vector is empty so we cannot rely on VEC_length to know how many
 844      elements to read.  So, this list is emitted as a 0-terminated
 845      list on the writer side.  */
 846   do
 847     {
 848       t = stream_read_tree (ib, data_in);
 849       if (t)
 850         VEC_quick_push (tree, BINFO_BASE_BINFOS (expr), t);
 851     }
 852   while (t);
 853
 854   BINFO_OFFSET (expr) = stream_read_tree (ib, data_in);
 855   BINFO_VTABLE (expr) = stream_read_tree (ib, data_in);
 856   BINFO_VPTR_FIELD (expr) = stream_read_tree (ib, data_in);
 857
 858   len = streamer_read_uhwi (ib);
 859   if (len > 0)
 860     {
 861       VEC_reserve_exact (tree, gc, BINFO_BASE_ACCESSES (expr), len);
 862       for (i = 0; i < len; i++)
 863         {
 864           tree a = stream_read_tree (ib, data_in);
 865           VEC_quick_push (tree, BINFO_BASE_ACCESSES (expr), a);
 866         }
 867     }
 868
 869   BINFO_INHERITANCE_CHAIN (expr) = stream_read_tree (ib, data_in);
 870   BINFO_SUBVTT_INDEX (expr) = stream_read_tree (ib, data_in);
 871   BINFO_VPTR_INDEX (expr) = stream_read_tree (ib, data_in);
 872 }
 873
 874
 875 /* Read all pointer fields in the TS_CONSTRUCTOR structure of EXPR from
 876    input block IB.  DATA_IN contains tables and descriptors for the
 877    file being read.  */
 878
 879 static void
 880 lto_input_ts_constructor_tree_pointers (struct lto_input_block *ib,
 881                                         struct data_in *data_in, tree expr)
 882 {
 883   unsigned i, len;
 884
 885   len = streamer_read_uhwi (ib);
 886   for (i = 0; i < len; i++)
 887     {
 888       tree index, value;
 889
 890       index = stream_read_tree (ib, data_in);
 891       value = stream_read_tree (ib, data_in);
 892       CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (expr), index, value);
 893     }
 894 }
 895
 896
 897 /* Input a TS_TARGET_OPTION tree from IB into EXPR.  */
 898
 899 static void
 900 lto_input_ts_target_option (struct lto_input_block *ib, tree expr)
 901 {
 902   unsigned i, len;
 903   struct bitpack_d bp;
 904   struct cl_target_option *t = TREE_TARGET_OPTION (expr);
 905
 906   bp = streamer_read_bitpack (ib);
 907   len = sizeof (struct cl_target_option);
 908   for (i = 0; i < len; i++)
 909     ((unsigned char *)t)[i] = bp_unpack_value (&bp, 8);
 910   if (bp_unpack_value (&bp, 32) != 0x12345678)
 911     fatal_error ("cl_target_option size mismatch in LTO reader and writer");
 912 }
 913
 914 /* Input a TS_OPTIMIZATION tree from IB into EXPR.  */
 915
 916 static void
 917 lto_input_ts_optimization (struct lto_input_block *ib, tree expr)
 918 {
 919   unsigned i, len;
 920   struct bitpack_d bp;
 921   struct cl_optimization *t = TREE_OPTIMIZATION (expr);
 922
 923   bp = streamer_read_bitpack (ib);
 924   len = sizeof (struct cl_optimization);
 925   for (i = 0; i < len; i++)
 926     ((unsigned char *)t)[i] = bp_unpack_value (&bp, 8);
 927   if (bp_unpack_value (&bp, 32) != 0x12345678)
 928     fatal_error ("cl_optimization size mismatch in LTO reader and writer");
 929 }
 930
 931 /* Input a TS_TRANSLATION_UNIT_DECL tree from IB and DATA_IN into EXPR.  */
 932
 933 static void
 934 lto_input_ts_translation_unit_decl_tree_pointers (struct lto_input_block *ib,
 935                                                   struct data_in *data_in,
 936                                                   tree expr)
 937 {
 938   TRANSLATION_UNIT_LANGUAGE (expr) = xstrdup (streamer_read_string (data_in, ib));
 939   VEC_safe_push (tree, gc, all_translation_units, expr);
 940 }
 941
 942 /* Read all pointer fields in EXPR from input block IB.  DATA_IN
 943    contains tables and descriptors for the file being read.  */
 944
 945 void
 946 streamer_read_tree_body (struct lto_input_block *ib, struct data_in *data_in,
 947                          tree expr)
 948 {
 949   enum tree_code code;
 950
 951   code = TREE_CODE (expr);
 952
 953   if (CODE_CONTAINS_STRUCT (code, TS_TYPED))
 954     lto_input_ts_common_tree_pointers (ib, data_in, expr);
 955
 956   if (CODE_CONTAINS_STRUCT (code, TS_VECTOR))
 957     lto_input_ts_vector_tree_pointers (ib, data_in, expr);
 958
 959   if (CODE_CONTAINS_STRUCT (code, TS_COMPLEX))
 960     lto_input_ts_complex_tree_pointers (ib, data_in, expr);
 961
 962   if (CODE_CONTAINS_STRUCT (code, TS_DECL_MINIMAL))
 963     lto_input_ts_decl_minimal_tree_pointers (ib, data_in, expr);
 964
 965   if (CODE_CONTAINS_STRUCT (code, TS_DECL_COMMON))
 966     lto_input_ts_decl_common_tree_pointers (ib, data_in, expr);
 967
 968   if (CODE_CONTAINS_STRUCT (code, TS_DECL_NON_COMMON))
 969     lto_input_ts_decl_non_common_tree_pointers (ib, data_in, expr);
 970
 971   if (CODE_CONTAINS_STRUCT (code, TS_DECL_WITH_VIS))
 972     lto_input_ts_decl_with_vis_tree_pointers (ib, data_in, expr);
 973
 974   if (CODE_CONTAINS_STRUCT (code, TS_FIELD_DECL))
 975     lto_input_ts_field_decl_tree_pointers (ib, data_in, expr);
 976
 977   if (CODE_CONTAINS_STRUCT (code, TS_FUNCTION_DECL))
 978     lto_input_ts_function_decl_tree_pointers (ib, data_in, expr);
 979
 980   if (CODE_CONTAINS_STRUCT (code, TS_TYPE_COMMON))
 981     lto_input_ts_type_common_tree_pointers (ib, data_in, expr);
 982
 983   if (CODE_CONTAINS_STRUCT (code, TS_TYPE_NON_COMMON))
 984     lto_input_ts_type_non_common_tree_pointers (ib, data_in, expr);
 985
 986   if (CODE_CONTAINS_STRUCT (code, TS_LIST))
 987     lto_input_ts_list_tree_pointers (ib, data_in, expr);
 988
 989   if (CODE_CONTAINS_STRUCT (code, TS_VEC))
 990     lto_input_ts_vec_tree_pointers (ib, data_in, expr);
 991
 992   if (CODE_CONTAINS_STRUCT (code, TS_EXP))
 993     lto_input_ts_exp_tree_pointers (ib, data_in, expr);
 994
 995   if (CODE_CONTAINS_STRUCT (code, TS_BLOCK))
 996     lto_input_ts_block_tree_pointers (ib, data_in, expr);
 997
 998   if (CODE_CONTAINS_STRUCT (code, TS_BINFO))
 999     lto_input_ts_binfo_tree_pointers (ib, data_in, expr);
1000
1001   if (CODE_CONTAINS_STRUCT (code, TS_CONSTRUCTOR))
1002     lto_input_ts_constructor_tree_pointers (ib, data_in, expr);
1003
1004   if (CODE_CONTAINS_STRUCT (code, TS_TARGET_OPTION))
1005     lto_input_ts_target_option (ib, expr);
1006
1007   if (CODE_CONTAINS_STRUCT (code, TS_OPTIMIZATION))
1008     lto_input_ts_optimization (ib, expr);
1009
1010   if (CODE_CONTAINS_STRUCT (code, TS_TRANSLATION_UNIT_DECL))
1011     lto_input_ts_translation_unit_decl_tree_pointers (ib, data_in, expr);
1012 }
1013
1014
1015 /* Read and INTEGER_CST node from input block IB using the per-file
1016    context in DATA_IN.  */
1017
1018 tree
1019 streamer_read_integer_cst (struct lto_input_block *ib, struct data_in *data_in)
1020 {
1021   tree result, type;
1022   HOST_WIDE_INT low, high;
1023   bool overflow_p;
1024
1025   type = stream_read_tree (ib, data_in);
1026   overflow_p = (streamer_read_uchar (ib) != 0);
1027   low = streamer_read_uhwi (ib);
1028   high = streamer_read_uhwi (ib);
1029   result = build_int_cst_wide (type, low, high);
1030
1031   /* If the original constant had overflown, build a replica of RESULT to
1032      avoid modifying the shared constant returned by build_int_cst_wide.  */
1033   if (overflow_p)
1034     {
1035       result = copy_node (result);
1036       TREE_OVERFLOW (result) = 1;
1037     }
1038
1039   return result;
1040 }
1041
1042
1043 /* Read an index IX from input block IB and return the tree node at
1044    DATA_IN->FILE_DATA->GLOBALS_INDEX[IX].  */
1045
1046 tree
1047 streamer_get_pickled_tree (struct lto_input_block *ib, struct data_in *data_in)
1048 {
1049   unsigned HOST_WIDE_INT ix;
1050   tree result;
1051   enum LTO_tags expected_tag;
1052
1053   ix = streamer_read_uhwi (ib);
1054   expected_tag = streamer_read_enum (ib, LTO_tags, LTO_NUM_TAGS);
1055
1056   result = streamer_tree_cache_get (data_in->reader_cache, ix);
1057   gcc_assert (result
1058               && TREE_CODE (result) == lto_tag_to_tree_code (expected_tag));
1059
1060   return result;
1061 }
1062
1063
1064 /* Read a code and class from input block IB and return the
1065    corresponding builtin.  DATA_IN is as in stream_read_tree.  */
1066
1067 tree
1068 streamer_get_builtin_tree (struct lto_input_block *ib, struct data_in *data_in)
1069 {
1070   enum built_in_class fclass;
1071   enum built_in_function fcode;
1072   const char *asmname;
1073   tree result;
1074
1075   fclass = streamer_read_enum (ib, built_in_class, BUILT_IN_LAST);
1076   gcc_assert (fclass == BUILT_IN_NORMAL || fclass == BUILT_IN_MD);
1077
1078   fcode = (enum built_in_function) streamer_read_uhwi (ib);
1079
1080   if (fclass == BUILT_IN_NORMAL)
1081     {
1082       if (fcode >= END_BUILTINS)
1083         fatal_error ("machine independent builtin code out of range");
1084       result = builtin_decl_explicit (fcode);
1085       gcc_assert (result);
1086     }
1087   else if (fclass == BUILT_IN_MD)
1088     {
1089       result = targetm.builtin_decl (fcode, true);
1090       if (!result || result == error_mark_node)
1091         fatal_error ("target specific builtin not available");
1092     }
1093   else
1094     gcc_unreachable ();
1095
1096   asmname = streamer_read_string (data_in, ib);
1097   if (asmname)
1098     set_builtin_user_assembler_name (result, asmname);
1099
1100   streamer_tree_cache_append (data_in->reader_cache, result);
1101
1102   return result;
1103 }