Java 类org.apache.bcel.generic.TargetLostException 实例源码

static private void deleteIns(InstructionList il, InstructionHandle ih,
    InstructionHandle new_target) {
    // System.out.println("deleteIns: instructionList = " + il);
    // System.out.println("   handle = " + ih);
    try {
        il.delete(ih);
    } catch (TargetLostException e) {
        InstructionHandle[] targets = e.getTargets();
        for (int i = 0; i < targets.length; i++) {
            InstructionTargeter[] targeters = targets[i].getTargeters();

            for (int j = 0; j < targeters.length; j++) {
                targeters[j].updateTarget(targets[i], new_target);
            }
        }
    }
}

static private void deleteIns(InstructionList il, InstructionHandle a,
    InstructionHandle b, InstructionHandle new_target) {
    try {
        il.delete(a, b);
    } catch (TargetLostException e) {
        InstructionHandle[] targets = e.getTargets();
        for (int i = 0; i < targets.length; i++) {
            InstructionTargeter[] targeters = targets[i].getTargeters();

            for (int j = 0; j < targeters.length; j++) {
                targeters[j].updateTarget(targets[i], new_target);
            }
        }
    }
}

private boolean change1(MethodGen mg)
    {
        InstructionList il = mg.getInstructionList();
        InstructionFinder f   = new InstructionFinder(il);
        String            pat = "[LDC_W|LDC] INVOKEVIRTUAL IFNE ICONST_1 GOTO ICONST_0";

        boolean changed = false;
        for(Iterator j = f.search(pat, new IsLdcClass()); j.hasNext(); )
        {
            InstructionHandle[] match = (InstructionHandle[]) j.next();

            // replace
            //    LDC_W <class>
            //    INVOKEVIRTUAL Class.desiredAssertionStatus
            //    IFNE
            //    ICONST_1
            //    goto
            //    ICONST_0
            // with
            //    ICONST_1

            changed = true;
            match[0].setInstruction(InstructionConstants.ICONST_1);
            try
            {
                il.delete(match[1], match[5]);
//                System.out.println(il);
            }
            catch (TargetLostException e)
            {
                e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
            }
        }
        return changed;
    }

private boolean change2(MethodGen mg)
{
    InstructionList il = mg.getInstructionList();
    InstructionFinder f   = new InstructionFinder(il);
    String            pat = "ALOAD_0 ALOAD_1 PUTFIELD ALOAD_0 INVOKESPECIAL";

    boolean changed = false;
    for(Iterator j = f.search(pat, new IsInnerConstructor()); j.hasNext(); )
    {
        InstructionHandle[] match = (InstructionHandle[]) j.next();

        // replace
        //    ALOAD_0       [0] 
        //    ALOAD_1       [1]
        //    PUTFIELD      [2]
        //    ALOAD_0       [3]
        //    INVOKESPECIAL [4]
        // with
        //    ALOAD_0       [0]
        //    INVOKESPECIAL [4]
        //    ALOAD_0       [3]
        //    ALOAD_1       [1]
        //    PUTFIELD      [2]

        changed = true;
        try
        {
            InstructionList il2 = new InstructionList();
            il2.append(match[3].getInstruction());
            il2.append(match[4].getInstruction());
            il.delete(match[3], match[4]);
            il.insert(match[0], il2);
        }
        catch (TargetLostException e)
        {
            System.err.println("ERROR IN "+mg);
            e.printStackTrace();
        }
    }
    return changed;
}