JNI_ENTRY(jclass, jni_FindClass(JNIEnv *env, const char *name))

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

      JNIWrapper("FindClass");

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

      DTRACE_PROBE2(hotspot_jni, FindClass__entry, env, name);

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

      jclass result = NULL;

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

      DT_RETURN_MARK(FindClass, jclass, (const jclass&)result);

  {- -------------------------------------------
  (1) (first_time_FindClass は, 初期値が true の static 変数.
       ここで false にしてしまうため, jni_FindClass が最初に呼ばれた時のみ true になっている.
       この値は後で使用する.)
      ---------------------------------------- -}

      // Remember if we are the first invocation of jni_FindClass
      bool first_time = first_time_FindClass;
      first_time_FindClass = false;

  {- -------------------------------------------
  (1) クラス名が NULL だったり, あるいは
      クラス名が長すぎる場合(Symbol::max_length() を超えている場合)は, NoClassDefFoundError.
      ---------------------------------------- -}

      // Sanity check the name:  it cannot be null or larger than the maximum size
      // name we can fit in the constant pool.
      if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
        THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
      }

  {- -------------------------------------------
  (1) (変数宣言など)
      (loader は, クラスの探索時に使用するクラスローダ.
       protection_domain は, クラスの探索時に使用する protection domain)
      ---------------------------------------- -}

      //%note jni_3
      Handle loader;
      Handle protection_domain;

  {- -------------------------------------------
  (1) クラスの探索時に使用するクラスローダ(loader)と protection_domain を適切に設定しておく.
      #TODO
      ---------------------------------------- -}

      // Find calling class
      instanceKlassHandle k (THREAD, thread->security_get_caller_class(0));
      if (k.not_null()) {
        loader = Handle(THREAD, k->class_loader());
        // Special handling to make sure JNI_OnLoad and JNI_OnUnload are executed
        // in the correct class context.
        if (loader.is_null() &&
            k->name() == vmSymbols::java_lang_ClassLoader_NativeLibrary()) {
          JavaValue result(T_OBJECT);
          JavaCalls::call_static(&result, k,
                                          vmSymbols::getFromClass_name(),
                                          vmSymbols::void_class_signature(),
                                          thread);
          if (HAS_PENDING_EXCEPTION) {
            Handle ex(thread, thread->pending_exception());
            CLEAR_PENDING_EXCEPTION;
            THROW_HANDLE_0(ex);
          }
          oop mirror = (oop) result.get_jobject();
          loader = Handle(THREAD,
            instanceKlass::cast(java_lang_Class::as_klassOop(mirror))->class_loader());
          protection_domain = Handle(THREAD,
            instanceKlass::cast(java_lang_Class::as_klassOop(mirror))->protection_domain());
        }
      } else {
        // We call ClassLoader.getSystemClassLoader to obtain the system class loader.
        loader = Handle(THREAD, SystemDictionary::java_system_loader());
      }

  {- -------------------------------------------
  (1) find_class_from_class_loader() を呼んで, 指定されたクラスを探し出す.
      ---------------------------------------- -}

      TempNewSymbol sym = SymbolTable::new_symbol(name, CHECK_NULL);
      result = find_class_from_class_loader(env, sym, true, loader,
                                            protection_domain, true, thread);

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

      if (TraceClassResolution && result != NULL) {
        trace_class_resolution(java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(result)));
      }

  {- -------------------------------------------
  (1) もし今回が jni_FindClass の初回の呼び出しであれば, 
      CompilationPolicy::completed_vm_startup() を呼び出して JIT コンパイルが有効な状態にしておく.
      ---------------------------------------- -}

      // If we were the first invocation of jni_FindClass, we enable compilation again
      // rather than just allowing invocation counter to overflow and decay.
      // Controlled by flag DelayCompilationDuringStartup.
      if (first_time && !CompileTheWorld)
        CompilationPolicy::completed_vm_startup();

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

      return result;
    JNI_END