disassembler.java

来自「First of all, the Applet-phone is a SIP 」· Java 代码 · 共 96 行

package gov.nist.util.disassembler;

import java.io.File;
import java.io.FileOutputStream;
import java.io.PrintStream;

import org.apache.bcel.classfile.ClassParser;
import org.apache.bcel.classfile.JavaClass;
import org.apache.bcel.classfile.Method;
import org.apache.bcel.generic.CodeExceptionGen;
import org.apache.bcel.generic.ConstantPoolGen;
import org.apache.bcel.generic.InstructionHandle;
import org.apache.bcel.generic.InstructionList;
import org.apache.bcel.generic.MethodGen;

/*
 * Disassembler.java
 *
 * Created on June 19, 2003, 9:47 AM
 */

/**
 *
 * @author  DERUELLE Jean
 */
public class Disassembler {
    String className=null;
    ConstantPoolGen cp=null;
    PrintStream ps=null;
    
    public Disassembler(String className,String outputFile){
        this.className=className;
        try{
            File file=new File(outputFile);
            if(file.exists())
                file.delete();
            file.createNewFile();
            FileOutputStream fos=new FileOutputStream(file);
            ps=new PrintStream(fos);
        }
        catch(Exception e){
            e.printStackTrace();
        }
    }
    
    public void printByteCodeMethod(MethodGen method){
        ps.println("/******************************/");
        ps.println("Method "+method.getName());
        ps.println("/******************************/");
        
        InstructionList il = method.getInstructionList();
        il.setPositions();
        InstructionHandle[] instructionHandles=il.getInstructionHandles();
        for(int i=0;i<instructionHandles.length;i++){
            ps.print(instructionHandles[i].getPosition()+"  ");
            ps.println(instructionHandles[i].getInstruction().toString(cp.getConstantPool()));
        }
        CodeExceptionGen[] exceptionTable=method.getExceptionHandlers();
        if(exceptionTable.length!=0){
            ps.println("/******************************/");
            ps.println("Exception(s) ");
            ps.println("/******************************/");        
            ps.println("Try start \t Try end \t Catch Start ");
            for(int i=0;i<exceptionTable.length;i++){
                ps.println(exceptionTable[i].getStartPC().getPosition()+" \t\t "+exceptionTable[i].getEndPC().getPosition()+" \t\t "+exceptionTable[i].getHandlerPC().getPosition());                       
                ps.println("Exception Type : "+exceptionTable[i].getCatchType().getClassName());
            }
        }
        ps.println();
    }
    
    public void printAllByteCode(){
        try{
            JavaClass jclass = new ClassParser(className).parse();
            cp  = new ConstantPoolGen(jclass.getConstantPool());
            ps.println("Informations about the class "+className+" : ");
            ps.println(jclass.toString());
            ps.println();
            Method methods[] = jclass.getMethods();  
            for (int i= 0; i < methods.length; i++) {
                MethodGen mg = new MethodGen(methods[i],jclass.getClassName(), cp);
                printByteCodeMethod(mg);                
            }
        }
        catch(java.io.IOException ioe){
            ioe.printStackTrace();
        }
    }
    
    public static void main(String args[]){
        Disassembler disassembler=new Disassembler(args[0],args[1]);
        disassembler.printAllByteCode();        
        //Class2HTML.main(args);
    }
}