Пример #1
0
tree
expand_start_catch_block (tree decl)
{
  tree exp;
  tree type;

  if (! doing_eh (1))
    return NULL_TREE;

  /* Make sure this declaration is reasonable.  */
  if (decl && !complete_ptr_ref_or_void_ptr_p (TREE_TYPE (decl), NULL_TREE))
    decl = NULL_TREE;

  if (decl)
    type = prepare_eh_type (TREE_TYPE (decl));
  else
    type = NULL_TREE;

  if (decl && decl_is_java_type (type, 1))
    {
      /* Java only passes object via pointer and doesn't require
	 adjusting.  The java object is immediately before the
	 generic exception header.  */
      exp = build_exc_ptr ();
      exp = build1 (NOP_EXPR, build_pointer_type (type), exp);
      exp = build2 (MINUS_EXPR, TREE_TYPE (exp), exp,
		    TYPE_SIZE_UNIT (TREE_TYPE (exp)));
      exp = build_indirect_ref (exp, NULL);
      initialize_handler_parm (decl, exp);
      return type;
    }

  /* Call __cxa_end_catch at the end of processing the exception.  */
  push_eh_cleanup (type);

  /* If there's no decl at all, then all we need to do is make sure
     to tell the runtime that we've begun handling the exception.  */
  if (decl == NULL)
    finish_expr_stmt (do_begin_catch ());

  /* If the C++ object needs constructing, we need to do that before
     calling __cxa_begin_catch, so that std::uncaught_exception gets
     the right value during the copy constructor.  */
  else if (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
    {
      exp = do_get_exception_ptr ();
      initialize_handler_parm (decl, exp);
      finish_expr_stmt (do_begin_catch ());
    }

  /* Otherwise the type uses a bitwise copy, and we don't have to worry
     about the value of std::uncaught_exception and therefore can do the
     copy with the return value of __cxa_end_catch instead.  */
  else
    {
      tree init = do_begin_catch ();
      exp = create_temporary_var (ptr_type_node);
      DECL_REGISTER (exp) = 1;
      cp_finish_decl (exp, init, NULL_TREE, LOOKUP_ONLYCONVERTING);
      finish_expr_stmt (build_modify_expr (exp, INIT_EXPR, init));
      initialize_handler_parm (decl, exp);
    }

  return type;
}
Пример #2
0
tree
expand_start_catch_block (tree decl)
{
  tree exp;
  tree type, init;

  if (! doing_eh ())
    return NULL_TREE;

  /* Make sure this declaration is reasonable.  */
  if (decl && !complete_ptr_ref_or_void_ptr_p (TREE_TYPE (decl), NULL_TREE))
    decl = error_mark_node;

  if (decl)
    type = prepare_eh_type (TREE_TYPE (decl));
  else
    type = NULL_TREE;

  if (decl && decl_is_java_type (type, 1))
    {
      /* Java only passes object via pointer and doesn't require
	 adjusting.  The java object is immediately before the
	 generic exception header.  */
      exp = build_exc_ptr ();
      exp = build1 (NOP_EXPR, build_pointer_type (type), exp);
      exp = fold_build_pointer_plus (exp,
		    fold_build1_loc (input_location,
				     NEGATE_EXPR, sizetype,
				     TYPE_SIZE_UNIT (TREE_TYPE (exp))));
      exp = cp_build_indirect_ref (exp, RO_NULL, tf_warning_or_error);
      initialize_handler_parm (decl, exp);
      return type;
    }

  /* Call __cxa_end_catch at the end of processing the exception.  */
  push_eh_cleanup (type);

  init = do_begin_catch ();

  /* If there's no decl at all, then all we need to do is make sure
     to tell the runtime that we've begun handling the exception.  */
  if (decl == NULL || decl == error_mark_node || init == error_mark_node)
    finish_expr_stmt (init);

  /* If the C++ object needs constructing, we need to do that before
     calling __cxa_begin_catch, so that std::uncaught_exception gets
     the right value during the copy constructor.  */
  else if (flag_use_cxa_get_exception_ptr
	   && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
    {
      exp = do_get_exception_ptr ();
      initialize_handler_parm (decl, exp);
      finish_expr_stmt (init);
    }

  /* Otherwise the type uses a bitwise copy, and we don't have to worry
     about the value of std::uncaught_exception and therefore can do the
     copy with the return value of __cxa_end_catch instead.  */
  else
    {
      tree init_type = type;

      /* Pointers are passed by values, everything else by reference.  */
      if (!TYPE_PTR_P (type))
	init_type = build_pointer_type (type);
      if (init_type != TREE_TYPE (init))
	init = build1 (NOP_EXPR, init_type, init);
      exp = create_temporary_var (init_type);
      DECL_REGISTER (exp) = 1;
      cp_finish_decl (exp, init, /*init_const_expr=*/false,
		      NULL_TREE, LOOKUP_ONLYCONVERTING);
      initialize_handler_parm (decl, exp);
    }

  return type;
}
Пример #3
0
tree
expand_start_catch_block (tree decl)
{
  tree exp;
  tree type, init;

  if (! doing_eh ())
    return NULL_TREE;

  if (decl)
    {
      if (!is_admissible_throw_operand_or_catch_parameter (decl, false))
	decl = error_mark_node;

      type = prepare_eh_type (TREE_TYPE (decl));
      mark_used (eh_type_info (type));
    }
  else
    type = NULL_TREE;

  /* Call __cxa_end_catch at the end of processing the exception.  */
  push_eh_cleanup (type);

  init = do_begin_catch ();

  /* If there's no decl at all, then all we need to do is make sure
     to tell the runtime that we've begun handling the exception.  */
  if (decl == NULL || decl == error_mark_node || init == error_mark_node)
    finish_expr_stmt (init);

  /* If the C++ object needs constructing, we need to do that before
     calling __cxa_begin_catch, so that std::uncaught_exception gets
     the right value during the copy constructor.  */
  else if (flag_use_cxa_get_exception_ptr
	   && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
    {
      exp = do_get_exception_ptr ();
      initialize_handler_parm (decl, exp);
      finish_expr_stmt (init);
    }

  /* Otherwise the type uses a bitwise copy, and we don't have to worry
     about the value of std::uncaught_exception and therefore can do the
     copy with the return value of __cxa_end_catch instead.  */
  else
    {
      tree init_type = type;

      /* Pointers are passed by values, everything else by reference.  */
      if (!TYPE_PTR_P (type))
	init_type = build_pointer_type (type);
      if (init_type != TREE_TYPE (init))
	init = build1 (NOP_EXPR, init_type, init);
      exp = create_temporary_var (init_type);
      cp_finish_decl (exp, init, /*init_const_expr=*/false,
		      NULL_TREE, LOOKUP_ONLYCONVERTING);
      DECL_REGISTER (exp) = 1;
      initialize_handler_parm (decl, exp);
    }

  return type;
}
Пример #4
0
tree
expand_start_catch_block (tree decl)
{
  tree exp = NULL_TREE;
  tree type;
  bool is_java;

  if (! doing_eh (1))
    return NULL_TREE;

  /* Make sure this declaration is reasonable.  */
  if (decl && !complete_ptr_ref_or_void_ptr_p (TREE_TYPE (decl), NULL_TREE))
    decl = NULL_TREE;

  if (decl)
    type = prepare_eh_type (TREE_TYPE (decl));
  else
    type = NULL_TREE;

  is_java = false;
  if (decl)
    {
      tree init;

      if (decl_is_java_type (type, 1))
	{
	  /* Java only passes object via pointer and doesn't require
	     adjusting.  The java object is immediately before the
	     generic exception header.  */
	  init = build_exc_ptr ();
	  init = build1 (NOP_EXPR, build_pointer_type (type), init);
	  init = build (MINUS_EXPR, TREE_TYPE (init), init,
			TYPE_SIZE_UNIT (TREE_TYPE (init)));
	  init = build_indirect_ref (init, NULL);
	  is_java = true;
	}
      else
	{
	  /* C++ requires that we call __cxa_begin_catch to get the
	     pointer to the actual object.  */
	  init = do_begin_catch ();
	}
	  
      exp = create_temporary_var (ptr_type_node);
      DECL_REGISTER (exp) = 1;
      cp_finish_decl (exp, init, NULL_TREE, LOOKUP_ONLYCONVERTING);
      finish_expr_stmt (build_modify_expr (exp, INIT_EXPR, init));
    }
  else
    finish_expr_stmt (do_begin_catch ());

  /* C++ requires that we call __cxa_end_catch at the end of
     processing the exception.  */
  if (! is_java)
    push_eh_cleanup (type);

  if (decl)
    initialize_handler_parm (decl, exp);

  return type;
}