/* Copyright (C) 2004-2007 Sami Koivu
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
package net.sf.rej.java.instruction;
import java.util.ArrayList;
import java.util.List;
import net.sf.rej.java.Descriptor;
import net.sf.rej.java.JavaType;
import net.sf.rej.java.constantpool.RefInfo;
import net.sf.rej.util.ByteSerializer;
import net.sf.rej.util.ByteToolkit;
/**
* Invoke instance method.
*
* @author Sami Koivu
*/
public class _invokevirtual extends Instruction {
public static final int OPCODE = 0xb6;
public static final String MNEMONIC = "invokevirtual";
private static final int SIZE = 3;
private int index = 0;
public _invokevirtual() {
}
public _invokevirtual(int index) {
this.index = index;
}
@Override
public int getOpcode() {
return OPCODE;
}
@Override
public String getMnemonic() {
return MNEMONIC;
}
@Override
public int getSize() {
return SIZE;
}
@Override
public void execute(ExecutionContext ec) {
}
@Override
public void setData(byte[] data, DecompilationContext dc) {
this.index = (int) ByteToolkit.getLong(data, 1, 2, true);
}
@Override
public byte[] getData(DecompilationContext dc) {
ByteSerializer ser = new ByteSerializer(true);
ser.addByte(OPCODE);
ser.addShort(this.index);
return ser.getBytes();
}
@Override
public Parameters getParameters() {
Parameters params = getParameterTypes();
params.addValue(this.index);
return params;
}
@Override
public Parameters getParameterTypes() {
return new Parameters(
new ParameterType[] { ParameterType.TYPE_CONSTANT_POOL_METHOD_REF });
}
@Override
public void setParameters(Parameters params) {
this.index = params.getInt(0);
}
@Override
public List<StackElement> getPoppedElements(DecompilationContext dc) {
List<StackElement> elements = new ArrayList<StackElement>();
// objectref of the object whose method is being called
elements.add(new StackElement("objectref", StackElementType.REF));
RefInfo ri = (RefInfo) dc.getConstantPool().get(this.index);
Descriptor desc = ri.getDescriptor();
int i=0;
for (JavaType jt : desc.getParamList()) {
i++;
String argName = "arg" + i;
if (jt.getDimensionCount() > 0 || (!jt.isPrimitive())) {
// array or primitive are both refs
elements.add(new StackElement(argName, StackElementType.REF));
} else {
// primitive non-array
if (jt.getType().equals("long")) {
elements.add(new StackElement(argName, StackElementType.LONG));
} else if (jt.getType().equals("float")) {
elements.add(new StackElement(argName, StackElementType.FLOAT));
} else if (jt.getType().equals("double")) {
elements.add(new StackElement(argName, StackElementType.DOUBLE));
} else {
// boolean, byte, short, char and int are all of type int
elements.add(new StackElement(argName, StackElementType.INT));
}
}
}
return elements;
}
@Override
public List<StackElement> getPushedElements(DecompilationContext dc) {
List<StackElement> elements = new ArrayList<StackElement>();
RefInfo ri = (RefInfo) dc.getConstantPool().get(this.index);
Descriptor desc = ri.getDescriptor();
JavaType jt = desc.getReturn();
if (jt.getDimensionCount() > 0 || (!jt.isPrimitive())) {
// array or primitive are both refs
elements.add(new StackElement("result", StackElementType.REF));
} else {
// primitive non-array
if (jt.getType().equals("long")) {
elements.add(new StackElement("result", StackElementType.LONG));
} else if (jt.getType().equals("float")) {
elements.add(new StackElement("result", StackElementType.FLOAT));
} else if (jt.getType().equals("double")) {
elements.add(new StackElement("result", StackElementType.DOUBLE));
} else if (jt.getType().equals("void")) {
// void, nothing is put on stack
} else {
// boolean, byte, short, char and int are all of type int
elements.add(new StackElement("result", StackElementType.INT));
}
}
return elements;
}
}