void InterpreterMacroAssembler::check_and_handle_popframe(Register java_thread) {

  {- -------------------------------------------
  (1) (JvmtiExport::can_pop_frame() が true でない場合は, (何もする必要が無いので) 以降の処理は全て省略)
      ---------------------------------------- -}

      if (JvmtiExport::can_pop_frame()) {

  {- -------------------------------------------
  (1) (変数宣言など)
      ---------------------------------------- -}

        Label L;

  {- -------------------------------------------
  (1) コード生成:
      「JavaThread::_popframe_condition フィールドをチェックし,
        (JavaThread::popframe_pending_bit が立っていて, かつ JavaThread::popframe_processing_bit が立っていなければ)
        Interpreter::remove_activation_preserving_args_entry() が返すアドレスにジャンプする.」

      (なお JavaThread::popframe_processing_bit が立っていれば, 
       それは「現在 PopFrame() の処理中」という意味. そのため再度処理する必要は無い.
       (See: TemplateInterpreterGenerator::generate_throw_exception()))
      ---------------------------------------- -}

        // Initiate popframe handling only if it is not already being
        // processed.  If the flag has the popframe_processing bit set, it
        // means that this code is called *during* popframe handling - we
        // don't want to reenter.
        // This method is only called just after the call into the vm in
        // call_VM_base, so the arg registers are available.
        movl(c_rarg0, Address(r15_thread, JavaThread::popframe_condition_offset()));
        testl(c_rarg0, JavaThread::popframe_pending_bit);
        jcc(Assembler::zero, L);
        testl(c_rarg0, JavaThread::popframe_processing_bit);
        jcc(Assembler::notZero, L);
        // Call Interpreter::remove_activation_preserving_args_entry() to get the
        // address of the same-named entrypoint in the generated interpreter code.
        call_VM_leaf(CAST_FROM_FN_PTR(address, Interpreter::remove_activation_preserving_args_entry));
        jmp(rax);
        bind(L);
      }
    }