C++ DECL_IGNORED_P函数代码示例

bool
gimple_can_coalesce_p (tree name1, tree name2)
{
  /* First check the SSA_NAME's associated DECL.  We only want to
     coalesce if they have the same DECL or both have no associated DECL.  */
  tree var1 = SSA_NAME_VAR (name1);
  tree var2 = SSA_NAME_VAR (name2);
  var1 = (var1 && (!VAR_P (var1) || !DECL_IGNORED_P (var1))) ? var1 : NULL_TREE;
  var2 = (var2 && (!VAR_P (var2) || !DECL_IGNORED_P (var2))) ? var2 : NULL_TREE;
  if (var1 != var2)
    return false;

  /* Now check the types.  If the types are the same, then we should
     try to coalesce V1 and V2.  */
  tree t1 = TREE_TYPE (name1);
  tree t2 = TREE_TYPE (name2);
  if (t1 == t2)
    return true;

  /* If the types are not the same, check for a canonical type match.  This
     (for example) allows coalescing when the types are fundamentally the
     same, but just have different names. 

     Note pointer types with different address spaces may have the same
     canonical type.  Those are rejected for coalescing by the
     types_compatible_p check.  */
  if (TYPE_CANONICAL (t1)
      && TYPE_CANONICAL (t1) == TYPE_CANONICAL (t2)
      && types_compatible_p (t1, t2))
    return true;

  return false;
}

void
declare_function_name ()
{
  tree decl, init;
  char *name, *printable_name;

  if (current_function_decl == NULL)
    {
      name = "";
      printable_name = "top level";
    }
  else
    {
      char *kind = "function";
      if (TREE_CODE (TREE_TYPE (current_function_decl)) == METHOD_TYPE)
	kind = "method";
      /* Allow functions to be nameless (such as artificial ones).  */
      if (DECL_NAME (current_function_decl))
        name = IDENTIFIER_POINTER (DECL_NAME (current_function_decl));
      else
	name = "";
      printable_name = (*decl_printable_name) (current_function_decl, &kind);
    }

  push_obstacks_nochange ();
  decl = build_decl (VAR_DECL, get_identifier ("__FUNCTION__"),
		     char_array_type_node);
  TREE_STATIC (decl) = 1;
  TREE_READONLY (decl) = 1;
  DECL_SOURCE_LINE (decl) = 0;
  DECL_IN_SYSTEM_HEADER (decl) = 1;
  DECL_IGNORED_P (decl) = 1;
  init = build_string (strlen (name) + 1, name);
  TREE_TYPE (init) = char_array_type_node;
  DECL_INITIAL (decl) = init;
  finish_decl (pushdecl (decl), init, NULL_TREE);

  push_obstacks_nochange ();
  decl = build_decl (VAR_DECL, get_identifier ("__PRETTY_FUNCTION__"),
		     char_array_type_node);
  TREE_STATIC (decl) = 1;
  TREE_READONLY (decl) = 1;
  DECL_SOURCE_LINE (decl) = 0;
  DECL_IN_SYSTEM_HEADER (decl) = 1;
  DECL_IGNORED_P (decl) = 1;
  init = build_string (strlen (printable_name) + 1, printable_name);
  TREE_TYPE (init) = char_array_type_node;
  DECL_INITIAL (decl) = init;
  finish_decl (pushdecl (decl), init, NULL_TREE);
}

tree
target_for_debug_bind (tree var)
{
  if (!MAY_HAVE_DEBUG_STMTS)
    return NULL_TREE;

  if (TREE_CODE (var) == SSA_NAME)
    {
      var = SSA_NAME_VAR (var);
      if (var == NULL_TREE)
	return NULL_TREE;
    }

  if ((TREE_CODE (var) != VAR_DECL
       || VAR_DECL_IS_VIRTUAL_OPERAND (var))
      && TREE_CODE (var) != PARM_DECL)
    return NULL_TREE;

  if (DECL_HAS_VALUE_EXPR_P (var))
    return target_for_debug_bind (DECL_VALUE_EXPR (var));

  if (DECL_IGNORED_P (var))
    return NULL_TREE;

  /* var-tracking only tracks registers.  */
  if (!is_gimple_reg_type (TREE_TYPE (var)))
    return NULL_TREE;

  return var;
}

static void
sdbout_toplevel_data (tree decl)
{
  tree type = TREE_TYPE (decl);

  if (DECL_IGNORED_P (decl))
    return;

  gcc_assert (TREE_CODE (decl) == VAR_DECL);
  gcc_assert (MEM_P (DECL_RTL (decl)));
  gcc_assert (DECL_INITIAL (decl));

  PUT_SDB_DEF (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)));
  PUT_SDB_VAL (XEXP (DECL_RTL (decl), 0));
  if (TREE_PUBLIC (decl))
    {
      PUT_SDB_SCL (C_EXT);
    }
  else
    {
      PUT_SDB_SCL (C_STAT);
    }
  PUT_SDB_TYPE (plain_type (type));
  PUT_SDB_ENDEF;
}

static tree
create_struct_var (tree type, tree decl, location_t location)
{
    char type_name[50];
    tree tmp_var;

    strcpy(type_name, "rz_");
    strcat(type_name, get_name(decl));

    tmp_var = build_decl (location,
            VAR_DECL, get_identifier(type_name),
            type);

    /* The variable was declared by the compiler.  */
    DECL_ARTIFICIAL (tmp_var) = 1;
    /* And we don't want debug info for it.  */
    DECL_IGNORED_P (tmp_var) = 1;

    /* Make the variable writable.  */
    TREE_READONLY (tmp_var) = 0;

    DECL_EXTERNAL (tmp_var) = 0;
    TREE_STATIC (tmp_var) = 0;
    TREE_USED (tmp_var) = 1;

		DECL_CONTEXT(tmp_var) = cfun->decl;

    return tmp_var;
}

static tree
getVolatile_builtin (tree method_return_type ATTRIBUTE_UNUSED, 
		     tree orig_call)
{
  tree addr, stmt, modify_stmt, tmp;
  UNMARSHAL3 (orig_call);
  (void) this_arg; /* Avoid set but not used warning.  */

  addr = build_addr_sum (method_return_type, obj_arg, offset_arg);
  addr 
    = fold_convert (build_pointer_type (build_type_variant 
					(method_return_type, 0, 1)), addr);
  
  stmt = build_call_expr (builtin_decl_explicit (BUILT_IN_SYNC_SYNCHRONIZE), 0);
  tmp = build_decl (BUILTINS_LOCATION, VAR_DECL, NULL, method_return_type);
  DECL_IGNORED_P (tmp) = 1;
  DECL_ARTIFICIAL (tmp) = 1;
  pushdecl (tmp);

  modify_stmt = fold_build2 (MODIFY_EXPR, method_return_type,
			     tmp,
			     build_java_indirect_ref (method_return_type, addr,
						      flag_check_references));

  stmt = build2 (COMPOUND_EXPR, void_type_node, modify_stmt, stmt);
  stmt = build2 (COMPOUND_EXPR, method_return_type, stmt, tmp);
  
  return stmt;
}

static tree
build_equiv_decl (tree union_type, bool is_init)
{
  tree decl;
  char name[15];
  static int serial = 0;

  if (is_init)
    {
      decl = gfc_create_var (union_type, "equiv");
      TREE_STATIC (decl) = 1;
      return decl;
    }

  snprintf (name, sizeof (name), "equiv.%d", serial++);
  decl = build_decl (VAR_DECL, get_identifier (name), union_type);
  DECL_ARTIFICIAL (decl) = 1;
  DECL_IGNORED_P (decl) = 1;

  if (!gfc_can_put_var_on_stack (DECL_SIZE_UNIT (decl)))
    TREE_STATIC (decl) = 1;

  TREE_ADDRESSABLE (decl) = 1;
  TREE_USED (decl) = 1;

  /* The source location has been lost, and doesn't really matter.
     We need to set it to something though.  */
  gfc_set_decl_location (decl, &gfc_current_locus);

  gfc_add_decl_to_function (decl);

  return decl;
}

static tree
create_cilk_helper_decl (struct wrapper_data *wd)
{
  char name[20];
  if (wd->type == CILK_BLOCK_FOR)
    sprintf (name, "_cilk_for_" HOST_WIDE_INT_PRINT_DEC, cilk_wrapper_count++);
  else if (wd->type == CILK_BLOCK_SPAWN)
    sprintf (name, "_cilk_spn_" HOST_WIDE_INT_PRINT_DEC, cilk_wrapper_count++);
  else
    gcc_unreachable (); 
  
  clean_symbol_name (name);

  tree fndecl = build_decl (DECL_SOURCE_LOCATION (current_function_decl),
			    FUNCTION_DECL, get_identifier (name), wd->fntype);

  TREE_PUBLIC (fndecl) = 0;
  TREE_STATIC (fndecl) = 1;
  TREE_USED (fndecl) = 1;
  DECL_ARTIFICIAL (fndecl) = 0;
  DECL_IGNORED_P (fndecl) = 0;
  DECL_EXTERNAL (fndecl) = 0;

  DECL_CONTEXT (fndecl) = wd->context; 
  tree block = make_node (BLOCK);
  DECL_INITIAL (fndecl) = block;
  TREE_USED (block) = 1;
  BLOCK_SUPERCONTEXT (block) = fndecl;
  gcc_assert (!DECL_SAVED_TREE (fndecl));

  /* Inlining would defeat the purpose of this wrapper.
     Either it secretly switches stack frames or it allocates
     a stable stack frame to hold function arguments even if
     the parent stack frame is stolen.  */
  DECL_UNINLINABLE (fndecl) = 1;

  tree result_decl = build_decl (UNKNOWN_LOCATION, RESULT_DECL, NULL_TREE, 
				 void_type_node);
  DECL_ARTIFICIAL (result_decl) = 0;
  DECL_IGNORED_P (result_decl) = 1;
  DECL_CONTEXT (result_decl) = fndecl;
  DECL_RESULT (fndecl) = result_decl;
  
  return fndecl;
}

tree
copy_var_decl (tree var, tree name, tree type)
{
  tree copy = build_decl (DECL_SOURCE_LOCATION (var), VAR_DECL, name, type);

  TREE_ADDRESSABLE (copy) = TREE_ADDRESSABLE (var);
  TREE_THIS_VOLATILE (copy) = TREE_THIS_VOLATILE (var);
  DECL_GIMPLE_REG_P (copy) = DECL_GIMPLE_REG_P (var);
  DECL_ARTIFICIAL (copy) = DECL_ARTIFICIAL (var);
  DECL_IGNORED_P (copy) = DECL_IGNORED_P (var);
  DECL_CONTEXT (copy) = DECL_CONTEXT (var);
  TREE_NO_WARNING (copy) = TREE_NO_WARNING (var);
  TREE_USED (copy) = 1;
  DECL_SEEN_IN_BIND_EXPR_P (copy) = 1;
  DECL_ATTRIBUTES (copy) = DECL_ATTRIBUTES (var);

  return copy;
}

/* Helper for mudflap_init: construct a decl with the given category,
   name, and type, mark it an external reference, and pushdecl it.  */
static inline tree
mf_make_builtin (enum tree_code category, const char *name, tree type)
{
  tree decl = mf_mark (build_decl (UNKNOWN_LOCATION,
				   category, get_identifier (name), type));
  TREE_PUBLIC (decl) = 1;
  DECL_EXTERNAL (decl) = 1;
  lang_hooks.decls.pushdecl (decl);
  /* The decl was declared by the compiler.  */
  DECL_ARTIFICIAL (decl) = 1;
  /* And we don't want debug info for it.  */
  DECL_IGNORED_P (decl) = 1;
  return decl;
}

static void
unpack_ts_decl_common_value_fields (struct bitpack_d *bp, tree expr)
{
  DECL_MODE (expr) = bp_unpack_machine_mode (bp);
  DECL_NONLOCAL (expr) = (unsigned) bp_unpack_value (bp, 1);
  DECL_VIRTUAL_P (expr) = (unsigned) bp_unpack_value (bp, 1);
  DECL_IGNORED_P (expr) = (unsigned) bp_unpack_value (bp, 1);
  DECL_ABSTRACT_P (expr) = (unsigned) bp_unpack_value (bp, 1);
  DECL_ARTIFICIAL (expr) = (unsigned) bp_unpack_value (bp, 1);
  DECL_USER_ALIGN (expr) = (unsigned) bp_unpack_value (bp, 1);
  DECL_PRESERVE_P (expr) = (unsigned) bp_unpack_value (bp, 1);
  DECL_EXTERNAL (expr) = (unsigned) bp_unpack_value (bp, 1);
  DECL_GIMPLE_REG_P (expr) = (unsigned) bp_unpack_value (bp, 1);
  DECL_ALIGN (expr) = (unsigned) bp_unpack_var_len_unsigned (bp);
#ifdef ACCEL_COMPILER
  if (DECL_ALIGN (expr) > targetm.absolute_biggest_alignment)
    DECL_ALIGN (expr) = targetm.absolute_biggest_alignment;
#endif
  if (TREE_CODE (expr) == LABEL_DECL)
    {
      EH_LANDING_PAD_NR (expr) = (int) bp_unpack_var_len_unsigned (bp);

      /* Always assume an initial value of -1 for LABEL_DECL_UID to
	 force gimple_set_bb to recreate label_to_block_map.  */
      LABEL_DECL_UID (expr) = -1;
    }

  if (TREE_CODE (expr) == FIELD_DECL)
    {
      DECL_PACKED (expr) = (unsigned) bp_unpack_value (bp, 1);
      DECL_NONADDRESSABLE_P (expr) = (unsigned) bp_unpack_value (bp, 1);
      expr->decl_common.off_align = bp_unpack_value (bp, 8);
    }

  if (TREE_CODE (expr) == VAR_DECL)
    {
      DECL_HAS_DEBUG_EXPR_P (expr) = (unsigned) bp_unpack_value (bp, 1);
      DECL_NONLOCAL_FRAME (expr) = (unsigned) bp_unpack_value (bp, 1);
    }

  if (TREE_CODE (expr) == RESULT_DECL
      || TREE_CODE (expr) == PARM_DECL
      || TREE_CODE (expr) == VAR_DECL)
    {
      DECL_BY_REFERENCE (expr) = (unsigned) bp_unpack_value (bp, 1);
      if (TREE_CODE (expr) == VAR_DECL
	  || TREE_CODE (expr) == PARM_DECL)
	DECL_HAS_VALUE_EXPR_P (expr) = (unsigned) bp_unpack_value (bp, 1);
    }
}

tree
start_var_decl (tree type, const char *name)
{
  tree var = build_decl (input_location,
			 VAR_DECL, get_identifier (name), type);
  TREE_STATIC (var) = 1;
  DECL_INITIAL (var) = error_mark_node;  /* A real initializer is coming... */
  DECL_IGNORED_P (var) = 1;
  DECL_ARTIFICIAL (var) = 1;
  DECL_CONTEXT (var) = NULL_TREE;
#ifdef OBJCPLUS
  DECL_THIS_STATIC (var) = 1; /* squash redeclaration errors */
#endif
  return var;
}

static tree
build_exception_object_var (void)
{
  tree decl = DECL_FUNCTION_EXC_OBJ (current_function_decl);
  if (decl == NULL)
    {
      decl = build_decl (DECL_SOURCE_LOCATION (current_function_decl),
			 VAR_DECL, get_identifier ("#exc_obj"), ptr_type_node);
      DECL_IGNORED_P (decl) = 1;
      DECL_ARTIFICIAL (decl) = 1;

      DECL_FUNCTION_EXC_OBJ (current_function_decl) = decl;
      pushdecl_function_level (decl);
    }
  return decl;
}

static void
pack_ts_decl_common_value_fields (struct bitpack_d *bp, tree expr)
{
  bp_pack_enum (bp, machine_mode, MAX_MACHINE_MODE, DECL_MODE (expr));
  bp_pack_value (bp, DECL_NONLOCAL (expr), 1);
  bp_pack_value (bp, DECL_VIRTUAL_P (expr), 1);
  bp_pack_value (bp, DECL_IGNORED_P (expr), 1);
  bp_pack_value (bp, DECL_ABSTRACT (expr), 1);
  bp_pack_value (bp, DECL_ARTIFICIAL (expr), 1);
  bp_pack_value (bp, DECL_USER_ALIGN (expr), 1);
  bp_pack_value (bp, DECL_PRESERVE_P (expr), 1);
  bp_pack_value (bp, DECL_EXTERNAL (expr), 1);
  bp_pack_value (bp, DECL_GIMPLE_REG_P (expr), 1);
  bp_pack_var_len_unsigned (bp, DECL_ALIGN (expr));

  if (TREE_CODE (expr) == LABEL_DECL)
    {
      /* Note that we do not write LABEL_DECL_UID.  The reader will
	 always assume an initial value of -1 so that the
	 label_to_block_map is recreated by gimple_set_bb.  */
      bp_pack_value (bp, DECL_ERROR_ISSUED (expr), 1);
      bp_pack_var_len_unsigned (bp, EH_LANDING_PAD_NR (expr));
    }

  if (TREE_CODE (expr) == FIELD_DECL)
    {
      bp_pack_value (bp, DECL_PACKED (expr), 1);
      bp_pack_value (bp, DECL_NONADDRESSABLE_P (expr), 1);
      bp_pack_value (bp, expr->decl_common.off_align, 8);
    }

  if (TREE_CODE (expr) == VAR_DECL)
    {
      bp_pack_value (bp, DECL_HAS_DEBUG_EXPR_P (expr), 1);
      bp_pack_value (bp, DECL_NONLOCAL_FRAME (expr), 1);
    }

  if (TREE_CODE (expr) == RESULT_DECL
      || TREE_CODE (expr) == PARM_DECL
      || TREE_CODE (expr) == VAR_DECL)
    {
      bp_pack_value (bp, DECL_BY_REFERENCE (expr), 1);
      if (TREE_CODE (expr) == VAR_DECL
	  || TREE_CODE (expr) == PARM_DECL)
	bp_pack_value (bp, DECL_HAS_VALUE_EXPR_P (expr), 1);
    }
}

static void
unpack_ts_decl_common_value_fields (struct bitpack_d *bp, tree expr)
{
  DECL_MODE (expr) = bp_unpack_enum (bp, machine_mode, MAX_MACHINE_MODE);
  DECL_NONLOCAL (expr) = (unsigned) bp_unpack_value (bp, 1);
  DECL_VIRTUAL_P (expr) = (unsigned) bp_unpack_value (bp, 1);
  DECL_IGNORED_P (expr) = (unsigned) bp_unpack_value (bp, 1);
  DECL_ABSTRACT (expr) = (unsigned) bp_unpack_value (bp, 1);
  DECL_ARTIFICIAL (expr) = (unsigned) bp_unpack_value (bp, 1);
  DECL_USER_ALIGN (expr) = (unsigned) bp_unpack_value (bp, 1);
  DECL_PRESERVE_P (expr) = (unsigned) bp_unpack_value (bp, 1);
  DECL_DEBUG_EXPR_IS_FROM (expr) = (unsigned) bp_unpack_value (bp, 1);
  DECL_EXTERNAL (expr) = (unsigned) bp_unpack_value (bp, 1);
  DECL_GIMPLE_REG_P (expr) = (unsigned) bp_unpack_value (bp, 1);
  DECL_ALIGN (expr) = (unsigned) bp_unpack_var_len_unsigned (bp);

  if (TREE_CODE (expr) == LABEL_DECL)
    {
      DECL_ERROR_ISSUED (expr) = (unsigned) bp_unpack_value (bp, 1);
      EH_LANDING_PAD_NR (expr) = (int) bp_unpack_var_len_unsigned (bp);

      /* Always assume an initial value of -1 for LABEL_DECL_UID to
	 force gimple_set_bb to recreate label_to_block_map.  */
      LABEL_DECL_UID (expr) = -1;
    }

  if (TREE_CODE (expr) == FIELD_DECL)
    {
      DECL_PACKED (expr) = (unsigned) bp_unpack_value (bp, 1);
      DECL_NONADDRESSABLE_P (expr) = (unsigned) bp_unpack_value (bp, 1);
      expr->decl_common.off_align = bp_unpack_value (bp, 8);
    }

  if (TREE_CODE (expr) == VAR_DECL)
    DECL_NONLOCAL_FRAME (expr) = (unsigned) bp_unpack_value (bp, 1);

  if (TREE_CODE (expr) == RESULT_DECL
      || TREE_CODE (expr) == PARM_DECL
      || TREE_CODE (expr) == VAR_DECL)
    {
      DECL_BY_REFERENCE (expr) = (unsigned) bp_unpack_value (bp, 1);
      if (TREE_CODE (expr) == VAR_DECL
	  || TREE_CODE (expr) == PARM_DECL)
	DECL_HAS_VALUE_EXPR_P (expr) = (unsigned) bp_unpack_value (bp, 1);
    }
}