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/*
* BCELTest.java
*/
/*
* Copyright (c) 2002 by Matthias Pfisterer <Matthias.Pfisterer@web.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library General Public License as published
* by the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
package org.tritonus.saol.compiler;
import java.io.IOException;
import org.apache.bcel.Constants;
import org.apache.bcel.classfile.Field;
import org.apache.bcel.classfile.JavaClass;
import org.apache.bcel.generic.*;
/** Example program using the BCEL.
BCEL is the Byte Code Engineering Library, part of the
jakarta project (http://jakarta.apache.org/bcel/).
*/
public class BCELTest
{
public static void main(String[] args)
{
String strClassName = "tone";
ClassGen classGen = new ClassGen(strClassName,
"AbstractInstrument",
"<generated>",
Constants.ACC_PUBLIC | Constants.ACC_SUPER,
null);
ConstantPoolGen constantPoolGen = classGen.getConstantPool();
int nAInitValueIndex = constantPoolGen.addFloat(0.196307F);
int nXInitValueIndex = constantPoolGen.addFloat(0.5F);
FieldGen fieldGen;
fieldGen = new FieldGen(Constants.ACC_PRIVATE,
Type.FLOAT,
"a",
constantPoolGen);
classGen.addField(fieldGen.getField());
fieldGen = new FieldGen(Constants.ACC_PRIVATE,
Type.FLOAT,
"x",
constantPoolGen);
classGen.addField(fieldGen.getField());
fieldGen = new FieldGen(Constants.ACC_PRIVATE,
Type.FLOAT,
"y",
constantPoolGen);
classGen.addField(fieldGen.getField());
fieldGen = new FieldGen(Constants.ACC_PRIVATE,
Type.FLOAT,
"init",
constantPoolGen);
classGen.addField(fieldGen.getField());
InstructionList il = new InstructionList();
MethodGen methodGen;
methodGen = new MethodGen(Constants.ACC_PUBLIC,
Type.VOID,
new Type[]{new ObjectType("RTSystem")},
new String[]{"rtSystem"},
"doAPass",
strClassName,
il,
constantPoolGen);
InstructionFactory ifac = new InstructionFactory(constantPoolGen);
il.append(InstructionConstants.ALOAD_0);
il.append(new LDC(nAInitValueIndex));
il.append(ifac.createPutField(strClassName, "a", Type.FLOAT));
il.append(InstructionConstants.ALOAD_0);
il.append(ifac.createGetField(strClassName, "init", Type.FLOAT));
il.append(InstructionConstants.FCONST_0);
il.append(InstructionConstants.FCMPL);
IFNE ifne0 = new IFNE(null);
il.append(ifne0);
il.append(InstructionConstants.ALOAD_0);
il.append(InstructionConstants.FCONST_1);
il.append(ifac.createPutField(strClassName, "init", Type.FLOAT));
il.append(InstructionConstants.ALOAD_0);
il.append(new LDC(nXInitValueIndex));
il.append(ifac.createPutField(strClassName, "x", Type.FLOAT));
InstructionHandle ih0 = il.append(InstructionConstants.ALOAD_0);
ifne0.setTarget(ih0);
il.append(InstructionConstants.ALOAD_0);
il.append(ifac.createGetField(strClassName, "x", Type.FLOAT));
il.append(InstructionConstants.ALOAD_0);
il.append(ifac.createGetField(strClassName, "a", Type.FLOAT));
il.append(InstructionConstants.ALOAD_0);
il.append(ifac.createGetField(strClassName, "y", Type.FLOAT));
il.append(InstructionConstants.FMUL);
il.append(InstructionConstants.FSUB);
il.append(ifac.createPutField(strClassName, "x", Type.FLOAT));
il.append(InstructionConstants.ALOAD_0);
il.append(InstructionConstants.ALOAD_0);
il.append(ifac.createGetField(strClassName, "y", Type.FLOAT));
il.append(InstructionConstants.ALOAD_0);
il.append(ifac.createGetField(strClassName, "a", Type.FLOAT));
il.append(InstructionConstants.ALOAD_0);
il.append(ifac.createGetField(strClassName, "x", Type.FLOAT));
il.append(InstructionConstants.FMUL);
il.append(InstructionConstants.FADD);
il.append(ifac.createPutField(strClassName, "y", Type.FLOAT));
il.append(InstructionConstants.ALOAD_1);
il.append(InstructionConstants.ALOAD_0);
il.append(ifac.createGetField(strClassName, "y", Type.FLOAT));
il.append(ifac.createInvoke("RTSystem", "output", Type.VOID, new Type[]{Type.FLOAT}, Constants.INVOKEVIRTUAL));
il.append(InstructionConstants.RETURN);
methodGen.setMaxStack();
classGen.addMethod(methodGen.getMethod());
classGen.addEmptyConstructor(Constants.ACC_PUBLIC);
JavaClass javaClass = classGen.getJavaClass();
try
{
javaClass.dump("tone.class");
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
/*** BCELTest.java ***/
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