C++ vec::create方法代码示例

static void
build_single_def_use_links (void)
{
  /* We use the multiple definitions problem to compute our restricted
     use-def chains.  */
  df_set_flags (DF_EQ_NOTES);
  df_md_add_problem ();
  df_note_add_problem ();
  df_analyze ();
  df_maybe_reorganize_use_refs (DF_REF_ORDER_BY_INSN_WITH_NOTES);

  use_def_ref.create (DF_USES_TABLE_SIZE ());
  use_def_ref.safe_grow_cleared (DF_USES_TABLE_SIZE ());

  reg_defs.create (max_reg_num ());
  reg_defs.safe_grow_cleared (max_reg_num ());

  reg_defs_stack.create (n_basic_blocks_for_fn (cfun) * 10);
  local_md = BITMAP_ALLOC (NULL);
  local_lr = BITMAP_ALLOC (NULL);

  /* Walk the dominator tree looking for single reaching definitions
     dominating the uses.  This is similar to how SSA form is built.  */
  single_def_use_dom_walker (CDI_DOMINATORS)
    .walk (cfun->cfg->x_entry_block_ptr);

  BITMAP_FREE (local_lr);
  BITMAP_FREE (local_md);
  reg_defs.release ();
  reg_defs_stack.release ();
}

scoped_attributes*
register_scoped_attributes (const struct attribute_spec * attributes,
			    const char* ns)
{
  scoped_attributes *result = NULL;

  /* See if we already have attributes in the namespace NS.  */
  result = find_attribute_namespace (ns);

  if (result == NULL)
    {
      /* We don't have any namespace NS yet.  Create one.  */
      scoped_attributes sa;

      if (!attributes_table.is_empty ())
	attributes_table.create (64);

      memset (&sa, 0, sizeof (sa));
      sa.ns = ns;
      sa.attributes.create (64);
      result = attributes_table.safe_push (sa);
      result->attribute_hash = new hash_table<attribute_hasher> (200);
    }

  /* Really add the attributes to their namespace now.  */
  for (unsigned i = 0; attributes[i].name != NULL; ++i)
    {
      result->attributes.safe_push (attributes[i]);
      register_scoped_attribute (&attributes[i], result);
    }

  gcc_assert (result != NULL);

  return result;
}

/* Create structures to hold check information
   for current function.  */
static void
chkp_init_check_info (void)
{
    struct bb_checks empty_bbc;
    int n;

    empty_bbc.checks = vNULL;

    chkp_release_check_info ();

    check_infos.create (last_basic_block_for_fn (cfun));
    for (n = 0; n < last_basic_block_for_fn (cfun); n++)
    {
        check_infos.safe_push (empty_bbc);
        check_infos.last ().checks.create (0);
    }
}

void
init_ssa_operands (struct function *fn)
{
  if (!n_initialized++)
    {
      build_uses.create (10);
      build_vuse = NULL_TREE;
      build_vdef = NULL_TREE;
      bitmap_obstack_initialize (&operands_bitmap_obstack);
    }

  gcc_assert (gimple_ssa_operands (fn)->operand_memory == NULL);
  gimple_ssa_operands (fn)->operand_memory_index
     = gimple_ssa_operands (fn)->ssa_operand_mem_size;
  gimple_ssa_operands (fn)->ops_active = true;
  gimple_ssa_operands (fn)->ssa_operand_mem_size = OP_SIZE_INIT;
  create_vop_var (fn);
}

/* Initialize the per SSA_NAME value-handles array.  Returns it.  */
void
threadedge_initialize_values (void)
{
  gcc_assert (!ssa_name_values.exists ());
  ssa_name_values.create (num_ssa_names);
}