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 import java.lang.invoke.WrongMethodTypeException;
  29 import java.util.Arrays;
  30 
  31 import nsk.share.test.TestUtils;
  32 import vm.mlvm.meth.share.Argument;
  33 import vm.mlvm.meth.share.Arguments;
  34 
  35 public class MHDropTF extends MHInsertOrDropTF {
  36 
  37     public MHDropTF(MHCall target, int pos, Argument[] values) {
  38         super(target, pos, values);
  39     }
  40 
  41     @Override
  42     protected void check() {
  43         int argCount = target.getArgs().length;
  44         if ( pos > argCount )
  45             throw new WrongMethodTypeException("position " + pos + " is invalid. Target has only " + argCount + " arguments");
  46     }
  47 
  48     @Override
  49     protected Argument[] computeInboundArgs(Argument[] targetArgs) {
  50         return TestUtils.concatArrays(
  51                 Arrays.copyOfRange(targetArgs, 0, this.pos),
  52                 this.values,
  53                 Arrays.copyOfRange(targetArgs, this.pos, targetArgs.length));
  54     }
  55 
  56     @Override
  57     protected MethodHandle computeInboundMH(MethodHandle targetMH) {
  58         return MethodHandles.dropArguments(targetMH, this.pos, Arguments.typesArray(this.values));
  59     }
  60 
  61     @Override
  62     protected String getName() {
  63         return "dropArguments";
  64     }
  65 }