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.util.Arrays;
  29 
  30 import nsk.share.test.TestUtils;
  31 import vm.mlvm.meth.share.Argument;
  32 import vm.mlvm.meth.share.MHUtils;
  33 
  34 public class MHFoldTF extends MHNaryTF {
  35 
  36     protected final MHCall _combiner, _target;
  37 
  38     public MHFoldTF(MHCall target, MHCall combiner) {
  39         _target = target;
  40         _combiner = combiner;
  41     }
  42 
  43     @Override
  44     protected void check() throws IllegalArgumentException {
  45         Argument[] targetArgs = _target.getArgs();
  46         Argument[] combinerArgs = _combiner.getArgs();
  47 
  48         MHUtils.assertAssignableType(
  49                 "combiner result assignable to parameter 0",
  50                 targetArgs[0].getType(),
  51                 _combiner.getRetVal().getType());
  52 
  53         for ( int i = 0; i < combinerArgs.length; i++ ) {
  54             MHUtils.assertAssignableType(
  55                     "combiner parameter " + i + " assignable to target parameter " + (i + 1),
  56                     combinerArgs[i].getType(),
  57                     targetArgs[i + 1].getType());
  58         }
  59     }
  60 
  61     @Override
  62     protected Argument computeRetVal() {
  63         return _target.getRetVal();
  64     }
  65 
  66     @Override
  67     protected Argument[] computeInboundArgs() {
  68         return TestUtils.cdr(_target.getArgs());
  69     }
  70 
  71     @Override
  72     protected MethodHandle computeInboundMH() {
  73         return MethodHandles.foldArguments(_target.getTargetMH(), _combiner.getTargetMH());
  74     }
  75 
  76     @Override
  77     public MHCall[] getOutboundCalls() {
  78         return new MHCall[] { _target, _combiner };
  79     }
  80 
  81     @Override
  82     protected String getName() {
  83         return "foldArguments";
  84     }
  85 
  86     @Override
  87     protected String getDescription() {
  88         return "combiner=" + _combiner;
  89     }
  90 }