JNI_ENTRY(jclass, jni_DefineClass(JNIEnv *env, const char *name, jobject loaderRef,
                                  const jbyte *buf, jsize bufLen))

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

      JNIWrapper("DefineClass");

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

      DTRACE_PROBE5(hotspot_jni, DefineClass__entry,
        env, name, loaderRef, buf, bufLen);

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

      jclass cls = NULL;

  {- -------------------------------------------
  (1) (DTrace のフック点)(リターン用) (See: DT_RETURN_MARK)
      ---------------------------------------- -}

      DT_RETURN_MARK(DefineClass, jclass, (const jclass&)cls);

  {- -------------------------------------------
  (1) もしクラス名が長すぎる場合 (Symbol::max_length() を超えている場合) は, NoClassDefFoundError.
      ---------------------------------------- -}

      // Since exceptions can be thrown, class initialization can take place
      // if name is NULL no check for class name in .class stream has to be made.
      if (name != NULL) {
        const int str_len = (int)strlen(name);
        if (str_len > Symbol::max_length()) {
          // It's impossible to create this class;  the name cannot fit
          // into the constant pool.
          THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
        }
      }

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

      TempNewSymbol class_name = SymbolTable::new_symbol(name, THREAD);

      ResourceMark rm(THREAD);
      ClassFileStream st((u1*) buf, bufLen, NULL);
      Handle class_loader (THREAD, JNIHandles::resolve(loaderRef));

  {- -------------------------------------------
  (1) (プロファイル情報の記録) ("sun.cls.jniDefineClassNoLockCalls") (See: UsePerfData)
      ---------------------------------------- -}

      if (UsePerfData && !class_loader.is_null()) {
        // check whether the current caller thread holds the lock or not.
        // If not, increment the corresponding counter
        if (ObjectSynchronizer::
            query_lock_ownership((JavaThread*)THREAD, class_loader) !=
            ObjectSynchronizer::owner_self) {
          ClassLoader::sync_JNIDefineClassLockFreeCounter()->inc();
        }
      }

  {- -------------------------------------------
  (1) SystemDictionary::resolve_from_stream() を呼び出して, クラスの生成を行う.
      ---------------------------------------- -}

      klassOop k = SystemDictionary::resolve_from_stream(class_name, class_loader,
                                                         Handle(), &st, true,
                                                         CHECK_NULL);

  {- -------------------------------------------
  (1) (トレース出力)
      ---------------------------------------- -}

      if (TraceClassResolution && k != NULL) {
        trace_class_resolution(k);
      }

  {- -------------------------------------------
  (1) 結果を JNI Handle 化してリターン.
      ---------------------------------------- -}

      cls = (jclass)JNIHandles::make_local(
        env, Klass::cast(k)->java_mirror());
      return cls;
    JNI_END