nmethod* SharkCompiler::generate_native_wrapper(MacroAssembler* masm,
                                                methodHandle    target,
                                                int             compile_id,
                                                BasicType*      arg_types,
                                                BasicType       return_type) {

  {- -------------------------------------------
  (1) (assert)
      ---------------------------------------- -}

      assert(is_initialized(), "should be");

  {- -------------------------------------------
  (1) (ResourceMark)
      ---------------------------------------- -}

      ResourceMark rm;

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

      const char *name = methodname(
        target->klass_name()->as_utf8(), target->name()->as_utf8());

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

      // Create the code buffer and builder
      SharkCodeBuffer cb(masm);
      SharkBuilder builder(&cb);

      // Emit the entry point
      SharkEntry *entry = (SharkEntry *) cb.malloc(sizeof(SharkEntry));

  {- -------------------------------------------
  (1) 生成するスタブの内容を表現した LLVM IR を作成する.
      ---------------------------------------- -}

      // Build the LLVM IR for the method
      SharkNativeWrapper *wrapper = SharkNativeWrapper::build(
        &builder, target, name, arg_types, return_type);

  {- -------------------------------------------
  (1) SharkCompiler::generate_native_code() を呼んで, 
      作成した LLVM IR からマシン語コードを生成する.
      ---------------------------------------- -}

      // Generate native code
      generate_native_code(entry, wrapper->function(), name);

  {- -------------------------------------------
  (1) nmethod::new_native_nmethod() を呼んで, できたコードを登録する
      ---------------------------------------- -}

      // Return the nmethod for installation in the VM
      return nmethod::new_native_nmethod(target,
                                         compile_id,
                                         masm->code(),
                                         0,
                                         0,
                                         wrapper->frame_size(),
                                         wrapper->receiver_offset(),
                                         wrapper->lock_offset(),
                                         wrapper->oop_maps());
    }