const char *
string_for_index (struct data_in *data_in, unsigned int loc, unsigned int *rlen)
{
  struct lto_input_block str_tab;
  unsigned int len;
  const char *result;

  if (!loc)
    {
      *rlen = 0;
      return NULL;
    }

  /* Get the string stored at location LOC in DATA_IN->STRINGS.  */
  LTO_INIT_INPUT_BLOCK (str_tab, data_in->strings, loc - 1,
			data_in->strings_len);
  len = streamer_read_uhwi (&str_tab);
  *rlen = len;

  if (str_tab.p + len > data_in->strings_len)
    internal_error ("bytecode stream: string too long for the string table");

  result = (const char *)(data_in->strings + str_tab.p);

  return result;
}
tree
streamer_read_integer_cst (struct lto_input_block *ib, struct data_in *data_in)
{
  tree type = stream_read_tree (ib, data_in);
  unsigned HOST_WIDE_INT low = streamer_read_uhwi (ib);
  HOST_WIDE_INT high = streamer_read_hwi (ib);
  return build_int_cst_wide (type, low, high);
}
void
input_bb (struct lto_input_block *ib, enum LTO_tags tag,
	  struct data_in *data_in, struct function *fn,
	  int count_materialization_scale)
{
  unsigned int index;
  basic_block bb;
  gimple_stmt_iterator bsi;

  /* This routine assumes that CFUN is set to FN, as it needs to call
     basic GIMPLE routines that use CFUN.  */
  gcc_assert (cfun == fn);

  index = streamer_read_uhwi (ib);
  bb = BASIC_BLOCK_FOR_FUNCTION (fn, index);

  bb->count = (streamer_read_hwi (ib) * count_materialization_scale
	       + REG_BR_PROB_BASE / 2) / REG_BR_PROB_BASE;
  bb->loop_depth = streamer_read_hwi (ib);
  bb->frequency = streamer_read_hwi (ib);
  bb->flags = streamer_read_hwi (ib);

  /* LTO_bb1 has statements.  LTO_bb0 does not.  */
  if (tag == LTO_bb0)
    return;

  bsi = gsi_start_bb (bb);
  tag = streamer_read_record_start (ib);
  while (tag)
    {
      gimple stmt = input_gimple_stmt (ib, data_in, fn, tag);
      if (!is_gimple_debug (stmt))
	find_referenced_vars_in (stmt);
      gsi_insert_after (&bsi, stmt, GSI_NEW_STMT);

      /* After the statement, expect a 0 delimiter or the EH region
	 that the previous statement belongs to.  */
      tag = streamer_read_record_start (ib);
      lto_tag_check_set (tag, 2, LTO_eh_region, LTO_null);

      if (tag == LTO_eh_region)
	{
	  HOST_WIDE_INT region = streamer_read_hwi (ib);
	  gcc_assert (region == (int) region);
	  add_stmt_to_eh_lp (stmt, region);
	}

      tag = streamer_read_record_start (ib);
    }

  tag = streamer_read_record_start (ib);
  while (tag)
    {
      gimple phi = input_phi (ib, bb, data_in, fn);
      find_referenced_vars_in (phi);
      tag = streamer_read_record_start (ib);
    }
}
Beispiel #4
0
static gphi *
input_phi (struct lto_input_block *ib, basic_block bb, struct data_in *data_in,
	   struct function *fn)
{
  unsigned HOST_WIDE_INT ix;
  tree phi_result;
  int i, len;
  gphi *result;

  ix = streamer_read_uhwi (ib);
  phi_result = (*SSANAMES (fn))[ix];
  len = EDGE_COUNT (bb->preds);
  result = create_phi_node (phi_result, bb);

  /* We have to go through a lookup process here because the preds in the
     reconstructed graph are generally in a different order than they
     were in the original program.  */
  for (i = 0; i < len; i++)
    {
      tree def = stream_read_tree (ib, data_in);
      int src_index = streamer_read_uhwi (ib);
      bitpack_d bp = streamer_read_bitpack (ib);
      /* Do not cache a location - we do not have API to get pointer to the
	 location in PHI statement and we may trigger reallocation.  */
      location_t arg_loc = stream_input_location_now (&bp, data_in);
      basic_block sbb = BASIC_BLOCK_FOR_FN (fn, src_index);

      edge e = NULL;
      int j;

      for (j = 0; j < len; j++)
	if (EDGE_PRED (bb, j)->src == sbb)
	  {
	    e = EDGE_PRED (bb, j);
	    break;
	  }

      add_phi_arg (result, def, e, arg_loc);
    }

  return result;
}
Beispiel #5
0
tree
streamer_get_builtin_tree (struct lto_input_block *ib, struct data_in *data_in)
{
  enum built_in_class fclass;
  enum built_in_function fcode;
  const char *asmname;
  tree result;

  fclass = streamer_read_enum (ib, built_in_class, BUILT_IN_LAST);
  gcc_assert (fclass == BUILT_IN_NORMAL || fclass == BUILT_IN_MD);

  fcode = (enum built_in_function) streamer_read_uhwi (ib);

  if (fclass == BUILT_IN_NORMAL)
    {
      if (fcode >= END_BUILTINS)
	fatal_error (input_location,
		     "machine independent builtin code out of range");
      result = builtin_decl_explicit (fcode);
      if (!result)
	{
	  if (fcode > BEGIN_CHKP_BUILTINS && fcode < END_CHKP_BUILTINS)
	    {
	      fcode = (enum built_in_function)
		      (fcode - BEGIN_CHKP_BUILTINS - 1);
	      result = builtin_decl_explicit (fcode);
	      result = chkp_maybe_clone_builtin_fndecl (result);
	    }
	  else if (fcode > BEGIN_SANITIZER_BUILTINS
		   && fcode < END_SANITIZER_BUILTINS)
	    {
	      initialize_sanitizer_builtins ();
	      result = builtin_decl_explicit (fcode);
	    }
	}
      gcc_assert (result);
    }
  else if (fclass == BUILT_IN_MD)
    {
      result = targetm.builtin_decl (fcode, true);
      if (!result || result == error_mark_node)
	fatal_error (input_location, "target specific builtin not available");
    }
  else
    gcc_unreachable ();

  asmname = streamer_read_string (data_in, ib);
  if (asmname)
    set_builtin_user_assembler_name (result, asmname);

  streamer_tree_cache_append (data_in->reader_cache, result, 0);

  return result;
}
static gimple
input_phi (struct lto_input_block *ib, basic_block bb, struct data_in *data_in,
	   struct function *fn)
{
  unsigned HOST_WIDE_INT ix;
  tree phi_result;
  int i, len;
  gimple result;

  ix = streamer_read_uhwi (ib);
  phi_result = VEC_index (tree, SSANAMES (fn), ix);
  len = EDGE_COUNT (bb->preds);
  result = create_phi_node (phi_result, bb);
  SSA_NAME_DEF_STMT (phi_result) = result;

  /* We have to go through a lookup process here because the preds in the
     reconstructed graph are generally in a different order than they
     were in the original program.  */
  for (i = 0; i < len; i++)
    {
      tree def = stream_read_tree (ib, data_in);
      int src_index = streamer_read_uhwi (ib);
      location_t arg_loc = lto_input_location (ib, data_in);
      basic_block sbb = BASIC_BLOCK_FOR_FUNCTION (fn, src_index);

      edge e = NULL;
      int j;

      for (j = 0; j < len; j++)
	if (EDGE_PRED (bb, j)->src == sbb)
	  {
	    e = EDGE_PRED (bb, j);
	    break;
	  }

      add_phi_arg (result, def, e, arg_loc);
    }

  return result;
}
tree
streamer_read_integer_cst (struct lto_input_block *ib, struct data_in *data_in)
{
  tree result, type;
  HOST_WIDE_INT low, high;
  bool overflow_p;

  type = stream_read_tree (ib, data_in);
  overflow_p = (streamer_read_uchar (ib) != 0);
  low = streamer_read_uhwi (ib);
  high = streamer_read_uhwi (ib);
  result = build_int_cst_wide (type, low, high);

  /* If the original constant had overflown, build a replica of RESULT to
     avoid modifying the shared constant returned by build_int_cst_wide.  */
  if (overflow_p)
    {
      result = copy_node (result);
      TREE_OVERFLOW (result) = 1;
    }

  return result;
}
Beispiel #8
0
tree
streamer_get_pickled_tree (struct lto_input_block *ib, struct data_in *data_in)
{
  unsigned HOST_WIDE_INT ix;
  tree result;
  enum LTO_tags expected_tag;

  ix = streamer_read_uhwi (ib);
  expected_tag = streamer_read_enum (ib, LTO_tags, LTO_NUM_TAGS);

  result = streamer_tree_cache_get_tree (data_in->reader_cache, ix);
  gcc_assert (result
              && TREE_CODE (result) == lto_tag_to_tree_code (expected_tag));

  return result;
}
static void
lto_input_ts_constructor_tree_pointers (struct lto_input_block *ib,
				        struct data_in *data_in, tree expr)
{
  unsigned i, len;

  len = streamer_read_uhwi (ib);
  for (i = 0; i < len; i++)
    {
      tree index, value;

      index = stream_read_tree (ib, data_in);
      value = stream_read_tree (ib, data_in);
      CONSTRUCTOR_APPEND_ELT (CONSTRUCTOR_ELTS (expr), index, value);
    }
}
static void
lto_input_ts_binfo_tree_pointers (struct lto_input_block *ib,
				  struct data_in *data_in, tree expr)
{
  unsigned i, len;
  tree t;

  /* Note that the number of slots in EXPR was read in
     streamer_alloc_tree when instantiating EXPR.  However, the
     vector is empty so we cannot rely on VEC_length to know how many
     elements to read.  So, this list is emitted as a 0-terminated
     list on the writer side.  */
  do
    {
      t = stream_read_tree (ib, data_in);
      if (t)
	VEC_quick_push (tree, BINFO_BASE_BINFOS (expr), t);
    }
  while (t);

  BINFO_OFFSET (expr) = stream_read_tree (ib, data_in);
  BINFO_VTABLE (expr) = stream_read_tree (ib, data_in);
  BINFO_VPTR_FIELD (expr) = stream_read_tree (ib, data_in);

  len = streamer_read_uhwi (ib);
  if (len > 0)
    {
      VEC_reserve_exact (tree, gc, BINFO_BASE_ACCESSES (expr), len);
      for (i = 0; i < len; i++)
	{
	  tree a = stream_read_tree (ib, data_in);
	  VEC_quick_push (tree, BINFO_BASE_ACCESSES (expr), a);
	}
    }

  BINFO_INHERITANCE_CHAIN (expr) = stream_read_tree (ib, data_in);
  BINFO_SUBVTT_INDEX (expr) = stream_read_tree (ib, data_in);
  BINFO_VPTR_INDEX (expr) = stream_read_tree (ib, data_in);
}
const char *
streamer_read_indexed_string (struct data_in *data_in,
			      struct lto_input_block *ib, unsigned int *rlen)
{
  return string_for_index (data_in, streamer_read_uhwi (ib), rlen);
}
Beispiel #12
0
tree
streamer_alloc_tree (struct lto_input_block *ib, struct data_in *data_in,
		     enum LTO_tags tag)
{
  enum tree_code code;
  tree result;
#ifdef LTO_STREAMER_DEBUG
  HOST_WIDE_INT orig_address_in_writer;
#endif

  result = NULL_TREE;

#ifdef LTO_STREAMER_DEBUG
  /* Read the word representing the memory address for the tree
     as it was written by the writer.  This is useful when
     debugging differences between the writer and reader.  */
  orig_address_in_writer = streamer_read_hwi (ib);
  gcc_assert ((intptr_t) orig_address_in_writer == orig_address_in_writer);
#endif

  code = lto_tag_to_tree_code (tag);

  /* We should never see an SSA_NAME tree.  Only the version numbers of
     SSA names are ever written out.  See input_ssa_names.  */
  gcc_assert (code != SSA_NAME);

  /* Instantiate a new tree using the header data.  */
  if (CODE_CONTAINS_STRUCT (code, TS_STRING))
    result = streamer_read_string_cst (data_in, ib);
  else if (CODE_CONTAINS_STRUCT (code, TS_IDENTIFIER))
    result = input_identifier (data_in, ib);
  else if (CODE_CONTAINS_STRUCT (code, TS_VEC))
    {
      HOST_WIDE_INT len = streamer_read_hwi (ib);
      result = make_tree_vec (len);
    }
  else if (CODE_CONTAINS_STRUCT (code, TS_VECTOR))
    {
      HOST_WIDE_INT len = streamer_read_hwi (ib);
      result = make_vector (len);
    }
  else if (CODE_CONTAINS_STRUCT (code, TS_BINFO))
    {
      unsigned HOST_WIDE_INT len = streamer_read_uhwi (ib);
      result = make_tree_binfo (len);
    }
  else if (CODE_CONTAINS_STRUCT (code, TS_INT_CST))
    {
      unsigned HOST_WIDE_INT len = streamer_read_uhwi (ib);
      unsigned HOST_WIDE_INT ext_len = streamer_read_uhwi (ib);
      result = make_int_cst (len, ext_len);
    }
  else if (code == CALL_EXPR)
    {
      unsigned HOST_WIDE_INT nargs = streamer_read_uhwi (ib);
      return build_vl_exp (CALL_EXPR, nargs + 3);
    }
  else if (code == OMP_CLAUSE)
    {
      enum omp_clause_code subcode
	= (enum omp_clause_code) streamer_read_uhwi (ib);
      return build_omp_clause (UNKNOWN_LOCATION, subcode);
    }
  else
    {
      /* For all other nodes, materialize the tree with a raw
	 make_node call.  */
      result = make_node (code);
    }

#ifdef LTO_STREAMER_DEBUG
  /* Store the original address of the tree as seen by the writer
     in RESULT's aux field.  This is useful when debugging streaming
     problems.  This way, a debugging session can be started on
     both writer and reader with a breakpoint using this address
     value in both.  */
  lto_orig_address_map (result, (intptr_t) orig_address_in_writer);
#endif

  return result;
}
static gimple
input_gimple_stmt (struct lto_input_block *ib, struct data_in *data_in,
		   struct function *fn, enum LTO_tags tag)
{
  gimple stmt;
  enum gimple_code code;
  unsigned HOST_WIDE_INT num_ops;
  size_t i;
  struct bitpack_d bp;

  code = lto_tag_to_gimple_code (tag);

  /* Read the tuple header.  */
  bp = streamer_read_bitpack (ib);
  num_ops = bp_unpack_var_len_unsigned (&bp);
  stmt = gimple_alloc (code, num_ops);
  stmt->gsbase.no_warning = bp_unpack_value (&bp, 1);
  if (is_gimple_assign (stmt))
    stmt->gsbase.nontemporal_move = bp_unpack_value (&bp, 1);
  stmt->gsbase.has_volatile_ops = bp_unpack_value (&bp, 1);
  stmt->gsbase.subcode = bp_unpack_var_len_unsigned (&bp);

  /* Read location information.  */
  gimple_set_location (stmt, lto_input_location (ib, data_in));

  /* Read lexical block reference.  */
  gimple_set_block (stmt, stream_read_tree (ib, data_in));

  /* Read in all the operands.  */
  switch (code)
    {
    case GIMPLE_RESX:
      gimple_resx_set_region (stmt, streamer_read_hwi (ib));
      break;

    case GIMPLE_EH_MUST_NOT_THROW:
      gimple_eh_must_not_throw_set_fndecl (stmt, stream_read_tree (ib, data_in));
      break;

    case GIMPLE_EH_DISPATCH:
      gimple_eh_dispatch_set_region (stmt, streamer_read_hwi (ib));
      break;

    case GIMPLE_ASM:
      {
	/* FIXME lto.  Move most of this into a new gimple_asm_set_string().  */
	tree str;
	stmt->gimple_asm.ni = streamer_read_uhwi (ib);
	stmt->gimple_asm.no = streamer_read_uhwi (ib);
	stmt->gimple_asm.nc = streamer_read_uhwi (ib);
	stmt->gimple_asm.nl = streamer_read_uhwi (ib);
	str = streamer_read_string_cst (data_in, ib);
	stmt->gimple_asm.string = TREE_STRING_POINTER (str);
      }
      /* Fallthru  */

    case GIMPLE_ASSIGN:
    case GIMPLE_CALL:
    case GIMPLE_RETURN:
    case GIMPLE_SWITCH:
    case GIMPLE_LABEL:
    case GIMPLE_COND:
    case GIMPLE_GOTO:
    case GIMPLE_DEBUG:
      for (i = 0; i < num_ops; i++)
	{
	  tree op = stream_read_tree (ib, data_in);
	  gimple_set_op (stmt, i, op);
	  if (!op)
	    continue;

	  /* Fixup FIELD_DECLs in COMPONENT_REFs, they are not handled
	     by decl merging.  */
	  if (TREE_CODE (op) == ADDR_EXPR)
	    op = TREE_OPERAND (op, 0);
	  while (handled_component_p (op))
	    {
	      if (TREE_CODE (op) == COMPONENT_REF)
		{
		  tree field, type, tem;
		  tree closest_match = NULL_TREE;
		  field = TREE_OPERAND (op, 1);
		  type = DECL_CONTEXT (field);
		  for (tem = TYPE_FIELDS (type); tem; tem = TREE_CHAIN (tem))
		    {
		      if (TREE_CODE (tem) != FIELD_DECL)
			continue;
		      if (tem == field)
			break;
		      if (DECL_NONADDRESSABLE_P (tem)
			  == DECL_NONADDRESSABLE_P (field)
			  && gimple_compare_field_offset (tem, field))
			{
			  if (types_compatible_p (TREE_TYPE (tem),
						  TREE_TYPE (field)))
			    break;
			  else
			    closest_match = tem;
			}
		    }
		  /* In case of type mismatches across units we can fail
		     to unify some types and thus not find a proper
		     field-decl here.  */
		  if (tem == NULL_TREE)
		    {
		      /* Thus, emit a ODR violation warning.  */
		      if (warning_at (gimple_location (stmt), 0,
				      "use of type %<%E%> with two mismatching "
				      "declarations at field %<%E%>",
				      type, TREE_OPERAND (op, 1)))
			{
			  if (TYPE_FIELDS (type))
			    inform (DECL_SOURCE_LOCATION (TYPE_FIELDS (type)),
				    "original type declared here");
			  inform (DECL_SOURCE_LOCATION (TREE_OPERAND (op, 1)),
				  "field in mismatching type declared here");
			  if (TYPE_NAME (TREE_TYPE (field))
			      && (TREE_CODE (TYPE_NAME (TREE_TYPE (field)))
				  == TYPE_DECL))
			    inform (DECL_SOURCE_LOCATION
				      (TYPE_NAME (TREE_TYPE (field))),
				    "type of field declared here");
			  if (closest_match
			      && TYPE_NAME (TREE_TYPE (closest_match))
			      && (TREE_CODE (TYPE_NAME
				   (TREE_TYPE (closest_match))) == TYPE_DECL))
			    inform (DECL_SOURCE_LOCATION
				      (TYPE_NAME (TREE_TYPE (closest_match))),
				    "type of mismatching field declared here");
			}
		      /* And finally fixup the types.  */
		      TREE_OPERAND (op, 0)
			= build1 (VIEW_CONVERT_EXPR, type,
				  TREE_OPERAND (op, 0));
		    }
		  else
		    TREE_OPERAND (op, 1) = tem;
		}

	      op = TREE_OPERAND (op, 0);
	    }
	}
      if (is_gimple_call (stmt))
	{
	  if (gimple_call_internal_p (stmt))
	    gimple_call_set_internal_fn
	      (stmt, streamer_read_enum (ib, internal_fn, IFN_LAST));
	  else
	    gimple_call_set_fntype (stmt, stream_read_tree (ib, data_in));
	}
      break;

    case GIMPLE_NOP:
    case GIMPLE_PREDICT:
      break;

    case GIMPLE_TRANSACTION:
      gimple_transaction_set_label (stmt, stream_read_tree (ib, data_in));
      break;

    default:
      internal_error ("bytecode stream: unknown GIMPLE statement tag %s",
		      lto_tag_name (tag));
    }

  /* Update the properties of symbols, SSA names and labels associated
     with STMT.  */
  if (code == GIMPLE_ASSIGN || code == GIMPLE_CALL)
    {
      tree lhs = gimple_get_lhs (stmt);
      if (lhs && TREE_CODE (lhs) == SSA_NAME)
	SSA_NAME_DEF_STMT (lhs) = stmt;
    }
  else if (code == GIMPLE_LABEL)
    gcc_assert (emit_label_in_global_context_p (gimple_label_label (stmt))
	        || DECL_CONTEXT (gimple_label_label (stmt)) == fn->decl);
  else if (code == GIMPLE_ASM)
    {
      unsigned i;

      for (i = 0; i < gimple_asm_noutputs (stmt); i++)
	{
	  tree op = TREE_VALUE (gimple_asm_output_op (stmt, i));
	  if (TREE_CODE (op) == SSA_NAME)
	    SSA_NAME_DEF_STMT (op) = stmt;
	}
    }

  /* Reset alias information.  */
  if (code == GIMPLE_CALL)
    gimple_call_reset_alias_info (stmt);

  /* Mark the statement modified so its operand vectors can be filled in.  */
  gimple_set_modified (stmt, true);

  return stmt;
}
Beispiel #14
0
static gimple *
input_gimple_stmt (struct lto_input_block *ib, struct data_in *data_in,
		   enum LTO_tags tag)
{
  gimple *stmt;
  enum gimple_code code;
  unsigned HOST_WIDE_INT num_ops;
  size_t i;
  struct bitpack_d bp;
  bool has_hist;

  code = lto_tag_to_gimple_code (tag);

  /* Read the tuple header.  */
  bp = streamer_read_bitpack (ib);
  num_ops = bp_unpack_var_len_unsigned (&bp);
  stmt = gimple_alloc (code, num_ops);
  stmt->no_warning = bp_unpack_value (&bp, 1);
  if (is_gimple_assign (stmt))
    stmt->nontemporal_move = bp_unpack_value (&bp, 1);
  stmt->has_volatile_ops = bp_unpack_value (&bp, 1);
  has_hist = bp_unpack_value (&bp, 1);
  stmt->subcode = bp_unpack_var_len_unsigned (&bp);

  /* Read location information.  Caching here makes no sense until streamer
     cache can handle the following gimple_set_block.  */
  gimple_set_location (stmt, stream_input_location_now (&bp, data_in));

  /* Read lexical block reference.  */
  gimple_set_block (stmt, stream_read_tree (ib, data_in));

  /* Read in all the operands.  */
  switch (code)
    {
    case GIMPLE_RESX:
      gimple_resx_set_region (as_a <gresx *> (stmt),
			      streamer_read_hwi (ib));
      break;

    case GIMPLE_EH_MUST_NOT_THROW:
      gimple_eh_must_not_throw_set_fndecl (
	as_a <geh_mnt *> (stmt),
	stream_read_tree (ib, data_in));
      break;

    case GIMPLE_EH_DISPATCH:
      gimple_eh_dispatch_set_region (as_a <geh_dispatch *> (stmt),
				     streamer_read_hwi (ib));
      break;

    case GIMPLE_ASM:
      {
	/* FIXME lto.  Move most of this into a new gimple_asm_set_string().  */
	gasm *asm_stmt = as_a <gasm *> (stmt);
	tree str;
	asm_stmt->ni = streamer_read_uhwi (ib);
	asm_stmt->no = streamer_read_uhwi (ib);
	asm_stmt->nc = streamer_read_uhwi (ib);
	asm_stmt->nl = streamer_read_uhwi (ib);
	str = streamer_read_string_cst (data_in, ib);
	asm_stmt->string = TREE_STRING_POINTER (str);
      }
      /* Fallthru  */

    case GIMPLE_ASSIGN:
    case GIMPLE_CALL:
    case GIMPLE_RETURN:
    case GIMPLE_SWITCH:
    case GIMPLE_LABEL:
    case GIMPLE_COND:
    case GIMPLE_GOTO:
    case GIMPLE_DEBUG:
      for (i = 0; i < num_ops; i++)
	{
	  tree *opp, op = stream_read_tree (ib, data_in);
	  gimple_set_op (stmt, i, op);
	  if (!op)
	    continue;

	  opp = gimple_op_ptr (stmt, i);
	  if (TREE_CODE (*opp) == ADDR_EXPR)
	    opp = &TREE_OPERAND (*opp, 0);
	  while (handled_component_p (*opp))
	    opp = &TREE_OPERAND (*opp, 0);
	  /* At LTO output time we wrap all global decls in MEM_REFs to
	     allow seamless replacement with prevailing decls.  Undo this
	     here if the prevailing decl allows for this.
	     ???  Maybe we should simply fold all stmts.  */
	  if (TREE_CODE (*opp) == MEM_REF
	      && TREE_CODE (TREE_OPERAND (*opp, 0)) == ADDR_EXPR
	      && integer_zerop (TREE_OPERAND (*opp, 1))
	      && (TREE_THIS_VOLATILE (*opp)
		  == TREE_THIS_VOLATILE
		       (TREE_OPERAND (TREE_OPERAND (*opp, 0), 0)))
	      && !TYPE_REF_CAN_ALIAS_ALL (TREE_TYPE (TREE_OPERAND (*opp, 1)))
	      && (TREE_TYPE (*opp)
		  == TREE_TYPE (TREE_TYPE (TREE_OPERAND (*opp, 1))))
	      && (TREE_TYPE (*opp)
		  == TREE_TYPE (TREE_OPERAND (TREE_OPERAND (*opp, 0), 0))))
	    *opp = TREE_OPERAND (TREE_OPERAND (*opp, 0), 0);
	}
      if (gcall *call_stmt = dyn_cast <gcall *> (stmt))
	{
	  if (gimple_call_internal_p (call_stmt))
	    gimple_call_set_internal_fn
	      (call_stmt, streamer_read_enum (ib, internal_fn, IFN_LAST));
	  else
	    gimple_call_set_fntype (call_stmt, stream_read_tree (ib, data_in));
	}
      break;

    case GIMPLE_NOP:
    case GIMPLE_PREDICT:
      break;

    case GIMPLE_TRANSACTION:
      gimple_transaction_set_label (as_a <gtransaction *> (stmt),
				    stream_read_tree (ib, data_in));
      break;

    default:
      internal_error ("bytecode stream: unknown GIMPLE statement tag %s",
		      lto_tag_name (tag));
    }

  /* Update the properties of symbols, SSA names and labels associated
     with STMT.  */
  if (code == GIMPLE_ASSIGN || code == GIMPLE_CALL)
    {
      tree lhs = gimple_get_lhs (stmt);
      if (lhs && TREE_CODE (lhs) == SSA_NAME)
	SSA_NAME_DEF_STMT (lhs) = stmt;
    }
  else if (code == GIMPLE_ASM)
    {
      gasm *asm_stmt = as_a <gasm *> (stmt);
      unsigned i;

      for (i = 0; i < gimple_asm_noutputs (asm_stmt); i++)
	{
	  tree op = TREE_VALUE (gimple_asm_output_op (asm_stmt, i));
	  if (TREE_CODE (op) == SSA_NAME)
	    SSA_NAME_DEF_STMT (op) = stmt;
	}
    }

  /* Reset alias information.  */
  if (code == GIMPLE_CALL)
    gimple_call_reset_alias_info (as_a <gcall *> (stmt));

  /* Mark the statement modified so its operand vectors can be filled in.  */
  gimple_set_modified (stmt, true);
  if (has_hist)
    stream_in_histogram_value (ib, stmt);

  return stmt;
}