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