1 /*
   2  * Copyright (c) 2011, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 package vm.mlvm.meth.share.transform.v2;
  25 
  26 import java.lang.invoke.MethodHandle;
  27 import java.lang.invoke.MethodHandles;
  28 
  29 import vm.mlvm.meth.share.Argument;
  30 
  31 public class MHIdentityTF extends MHNullaryTF {
  32 
  33     private final Argument _arg;
  34 
  35     public MHIdentityTF(Argument arg) {
  36         _arg = arg;
  37     }
  38 
  39     @Override
  40     protected void check() throws IllegalArgumentException {
  41     }
  42 
  43     @Override
  44     protected Argument computeRetVal() {
  45         return _arg;
  46     }
  47 
  48     @Override
  49     protected Argument[] computeInboundArgs() {
  50         return new Argument[] { _arg };
  51     }
  52 
  53     @Override
  54     protected MethodHandle computeInboundMH() {
  55         return MethodHandles.identity(_arg.getType());
  56     }
  57 
  58     @Override
  59     protected String getName() {
  60         return "identity";
  61     }
  62 
  63     @Override
  64     protected String getDescription() {
  65         return "arg=" + _arg;
  66     }
  67 
  68 }