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

/** Checks if the constraints of operands of the said instruction(s) are satisfied. */
public void visitLOOKUPSWITCH(LOOKUPSWITCH o){
    int[] matchs = o.getMatchs();
    int max = Integer.MIN_VALUE;
    for (int i=0; i<matchs.length; i++){
        if (matchs[i] == max && i != 0){
            constraintViolated(o, "Match '"+matchs[i]+"' occurs more than once.");
        }
        if (matchs[i] < max){
            constraintViolated(o, "Lookup table must be sorted but isn't.");
        }
        else{
            max = matchs[i];
        }
    }
}

private byte[] getCodeBytes(Method m, int start, int end) {
    byte[] code = m.getCode().getCode();
    byte[] bytes = new byte[end - start];
    System.arraycopy(code, start, bytes, 0, end - start);

    try {
        ByteSequence sequence = new ByteSequence(code);
        while ((sequence.available() > 0) && (sequence.getIndex() < start)) {
            Instruction.readInstruction(sequence);
        }

        int pos;
        while (sequence.available() > 0 && ((pos = sequence.getIndex()) < end)) {
            Instruction ins = Instruction.readInstruction(sequence);
            if ((ins instanceof BranchInstruction) && !(ins instanceof TABLESWITCH) && !(ins instanceof LOOKUPSWITCH)) {
                BranchInstruction bi = (BranchInstruction) ins;
                int offset = bi.getIndex();
                int target = offset + pos;
                if (target >= end) { // or target < start ??
                    byte hiByte = (byte) ((target >> 8) & 0x000000FF);
                    byte loByte = (byte) (target & 0x000000FF);
                    bytes[pos + bi.getLength() - 2 - start] = hiByte;
                    bytes[pos + bi.getLength() - 1 - start] = loByte;
                }
            }
        }
    } catch (IOException ioe) {
    }

    return bytes;
}

private byte[] getCodeBytes(Method m, int start, int end) {
    byte[] code = m.getCode().getCode();
    byte[] bytes = new byte[end - start];
    System.arraycopy(code, start, bytes, 0, end - start);

    try {
        ByteSequence sequence = new ByteSequence(code);
        while ((sequence.available() > 0) && (sequence.getIndex() < start)) {
            Instruction.readInstruction(sequence);
        }

        int pos;
        while (sequence.available() > 0 && ((pos = sequence.getIndex()) < end)) {
            Instruction ins = Instruction.readInstruction(sequence);
            if ((ins instanceof BranchInstruction) && !(ins instanceof TABLESWITCH) && !(ins instanceof LOOKUPSWITCH)) {
                BranchInstruction bi = (BranchInstruction) ins;
                int offset = bi.getIndex();
                int target = offset + pos;
                if (target >= end) { // or target < start ??
                    byte hiByte = (byte) ((target >> 8) & 0x000000FF);
                    byte loByte = (byte) (target & 0x000000FF);
                    bytes[pos + bi.getLength() - 2 - start] = hiByte;
                    bytes[pos + bi.getLength() - 1 - start] = loByte;
                }
            }
        }
    } catch (IOException ioe) {
    }

    return bytes;
}