C++ methodHandle::is_obsolete方法代码示例

void ConstantPoolCacheEntry::set_direct_or_vtable_call(Bytecodes::Code invoke_code,
                                                       methodHandle method,
                                                       int vtable_index) {
  bool is_vtable_call = (vtable_index >= 0);  // FIXME: split this method on this boolean
  assert(method->interpreter_entry() != NULL, "should have been set at this point");
  assert(!method->is_obsolete(),  "attempt to write obsolete method to cpCache");

  int byte_no = -1;
  bool change_to_virtual = false;

  switch (invoke_code) {
    case Bytecodes::_invokeinterface:
      // We get here from InterpreterRuntime::resolve_invoke when an invokeinterface
      // instruction somehow links to a non-interface method (in Object).
      // In that case, the method has no itable index and must be invoked as a virtual.
      // Set a flag to keep track of this corner case.
      change_to_virtual = true;

      // ...and fall through as if we were handling invokevirtual:
    case Bytecodes::_invokevirtual:
      {
        if (!is_vtable_call) {
          assert(method->can_be_statically_bound(), "");
          // set_f2_as_vfinal_method checks if is_vfinal flag is true.
          set_method_flags(as_TosState(method->result_type()),
                           (                             1      << is_vfinal_shift) |
                           ((method->is_final_method() ? 1 : 0) << is_final_shift)  |
                           ((change_to_virtual         ? 1 : 0) << is_forced_virtual_shift),
                           method()->size_of_parameters());
          set_f2_as_vfinal_method(method());
        } else {
          assert(!method->can_be_statically_bound(), "");
          assert(vtable_index >= 0, "valid index");
          assert(!method->is_final_method(), "sanity");
          set_method_flags(as_TosState(method->result_type()),
                           ((change_to_virtual ? 1 : 0) << is_forced_virtual_shift),
                           method()->size_of_parameters());
          set_f2(vtable_index);
        }
        byte_no = 2;
        break;
      }

    case Bytecodes::_invokespecial:
    case Bytecodes::_invokestatic:
      assert(!is_vtable_call, "");
      // Note:  Read and preserve the value of the is_vfinal flag on any
      // invokevirtual bytecode shared with this constant pool cache entry.
      // It is cheap and safe to consult is_vfinal() at all times.
      // Once is_vfinal is set, it must stay that way, lest we get a dangling oop.
      set_method_flags(as_TosState(method->result_type()),
                       ((is_vfinal()               ? 1 : 0) << is_vfinal_shift) |
                       ((method->is_final_method() ? 1 : 0) << is_final_shift),
                       method()->size_of_parameters());
      set_f1(method());
      byte_no = 1;
      break;
    default:
      ShouldNotReachHere();
      break;
  }

  // Note:  byte_no also appears in TemplateTable::resolve.
  if (byte_no == 1) {
    assert(invoke_code != Bytecodes::_invokevirtual &&
           invoke_code != Bytecodes::_invokeinterface, "");
    set_bytecode_1(invoke_code);
  } else if (byte_no == 2)  {
    if (change_to_virtual) {
      assert(invoke_code == Bytecodes::_invokeinterface, "");
      // NOTE: THIS IS A HACK - BE VERY CAREFUL!!!
      //
      // Workaround for the case where we encounter an invokeinterface, but we
      // should really have an _invokevirtual since the resolved method is a
      // virtual method in java.lang.Object. This is a corner case in the spec
      // but is presumably legal. javac does not generate this code.
      //
      // We set bytecode_1() to _invokeinterface, because that is the
      // bytecode # used by the interpreter to see if it is resolved.
      // We set bytecode_2() to _invokevirtual.
      // See also interpreterRuntime.cpp. (8/25/2000)
      // Only set resolved for the invokeinterface case if method is public.
      // Otherwise, the method needs to be reresolved with caller for each
      // interface call.
      if (method->is_public()) set_bytecode_1(invoke_code);
    } else {
      assert(invoke_code == Bytecodes::_invokevirtual, "");
    }
    // set up for invokevirtual, even if linking for invokeinterface also:
    set_bytecode_2(Bytecodes::_invokevirtual);
  } else {
    ShouldNotReachHere();
  }
  NOT_PRODUCT(verify(tty));
}