JNI_QUICK_ENTRY(jboolean, jni_IsSameObject(JNIEnv *env, jobject r1, jobject r2))

  {- -------------------------------------------
  (1) (デバッグ用の処理)
      (See: JNIWrapper)
      ---------------------------------------- -}

      JNIWrapper("IsSameObject");

  {- -------------------------------------------
  (1) (DTrace のフック点)
      ---------------------------------------- -}

      DTRACE_PROBE3(hotspot_jni, IsSameObject__entry, env, r1, r2);

  {- -------------------------------------------
  (1) JNIHandles::resolve() でそれぞれの JNIHandle オブジェクト内の oop を取得し, ポインタ値の比較を行うだけ.
      (返値は, 同じであれば JNI_TRUE, 違っていれば JNI_FALSE)
      ---------------------------------------- -}

      oop a = JNIHandles::resolve(r1);
      oop b = JNIHandles::resolve(r2);
      jboolean ret = (a == b) ? JNI_TRUE : JNI_FALSE;

  {- -------------------------------------------
  (1) (DTrace のフック点)
      ---------------------------------------- -}

      DTRACE_PROBE1(hotspot_jni, IsSameObject__return, ret);

  {- -------------------------------------------
  (1) 結果をリターン
      ---------------------------------------- -}

      return ret;
    JNI_END