realmodeexceptionhandler.java

JPC: x86 PC Hardware Emulator. 牛津大学开发的一个纯JAVA的x86系统结构硬件模拟器。

/*
    JPC: A x86 PC Hardware Emulator for a pure Java Virtual Machine
    Release Version 2.0

    A project from the Physics Dept, The University of Oxford

    Copyright (C) 2007 Isis Innovation Limited

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License version 2 as published by
    the Free Software Foundation.

    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 General Public License for more details.

    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
    Details (including contact information) can be found at: 

    www.physics.ox.ac.uk/jpc
*/

package org.jpc.emulator.memory.codeblock.fastcompiler.real;

import java.io.*;
import java.util.*;

import org.jpc.classfile.*;
import org.jpc.emulator.processor.*;

import org.jpc.emulator.memory.codeblock.fastcompiler.ExceptionHandler;
import org.jpc.emulator.memory.codeblock.fastcompiler.CountingOutputStream;

public class RealModeExceptionHandler extends ExceptionHandler
{
    public RealModeExceptionHandler(int lastX86Position, RealModeRPNNode initialNode, Map stateMap)
    {
	super(lastX86Position, initialNode, stateMap);
    }

    protected void writeHandlerRoutine(CountingOutputStream byteCodes, ClassFile cf) throws IOException
    {
	byteCodes.write(JavaOpcode.INVOKEVIRTUAL);
	try {
	    int cpIndex = cf.addToConstantPool(ProcessorException.class.getDeclaredMethod("getVector", (Class[])null));
	    if (cpIndex > 0xffff)
		throw new IllegalStateException("Compilation ran out of constant pool slots");
	    byteCodes.write(cpIndex >>> 8);
	    byteCodes.write(cpIndex & 0xff);
	} catch (NoSuchMethodException e) {
	    System.err.println(e);
	}

	byteCodes.write(JavaOpcode.ALOAD_1);
	byteCodes.write(JavaOpcode.SWAP);
	byteCodes.write(JavaOpcode.INVOKEVIRTUAL);
	try {
	    int cpIndex = cf.addToConstantPool(Processor.class.getDeclaredMethod("handleRealModeException", new Class[] {Integer.TYPE}));
	    if (cpIndex > 0xffff)
		throw new IllegalStateException("Compilation ran out of constant pool slots");
	    byteCodes.write(cpIndex >>> 8);
	    byteCodes.write(cpIndex & 0xff);
	} catch (NoSuchMethodException e) {
	    System.err.println(e);
	}
    }
}