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.MethodType;
  28 
  29 import vm.mlvm.meth.share.Argument;
  30 import vm.mlvm.meth.share.Arguments;
  31 import vm.mlvm.meth.share.TestTypes;
  32 
  33 public abstract class MHCastTF extends MHBasicUnaryTF {
  34 
  35     protected final Argument[] newArgs;
  36     protected final Argument newRetVal;
  37     protected final MethodType newMT;
  38 
  39     protected MHCastTF(MHCall target, Class<?> newRetType, Class<?>[] newArgTypes) {
  40         super(target);
  41 
  42         Argument[] targetArgs = target.getArgs();
  43 
  44         if ( newArgTypes.length != targetArgs.length )
  45             throw new IllegalArgumentException("newArgTypes length (" + newArgTypes.length + ") should be equal to argument count (" + targetArgs.length + ")");
  46 
  47         this.newArgs = new Argument[newArgTypes.length];
  48         for ( int i = 0; i < this.newArgs.length; i++ ) {
  49             if ( ! TestTypes.canConvertType(targetArgs[i].getType(), this.newArgs[i].getType(), false) )
  50                 throw new IllegalArgumentException("Can't convert argument #" + i + " from [" + targetArgs[i].getType() + " to [" + this.newArgs[i].getType());
  51 
  52             this.newArgs[i] = convert(targetArgs[i], newArgTypes[i], false);
  53         }
  54 
  55         this.newRetVal = convert(target.getRetVal(), newRetType, true);
  56 
  57         this.newMT = MethodType.methodType(this.newRetVal.getType(), Arguments.typesArray(this.newArgs));
  58     }
  59 
  60     protected abstract Argument convert(Argument argument, Class<?> newClass, boolean isRetType);
  61 
  62     @Override
  63     protected abstract MethodHandle computeInboundMH(MethodHandle targetMH) throws NoSuchMethodException, IllegalAccessException;
  64 
  65     @Override
  66     protected Argument[] computeInboundArgs(Argument[] targetArgs) {
  67         return this.newArgs;
  68     }
  69 
  70     @Override
  71     protected Argument computeRetVal(Argument targetRetVal) {
  72         return this.newRetVal;
  73     }
  74 
  75     @Override
  76     protected String getDescription() {
  77         return "newRetVal=[" + this.newRetVal + "]; newArgs=[" + this.newArgs + "]";
  78     }
  79 
  80 }