Examples with SIPUSH org.apache.bcel.generic.SIPUSH used on opensource projects

Example 1 with SIPUSH

use of org.apache.bcel.generic.SIPUSH in project jop by jop-devel.

the class ReplaceIinc method replace.

private void replace(MethodInfo method) {
    MethodCode mc = method.getCode();
    InstructionList il = mc.getInstructionList();
    InstructionFinder f = new InstructionFinder(il);
    for (Iterator i = f.search("IINC"); i.hasNext(); ) {
        InstructionHandle[] match = (InstructionHandle[]) i.next();
        InstructionHandle ih = match[0];
        IINC ii = (IINC) ih.getInstruction();
        int idx = ii.getIndex();
        int inc = ii.getIncrement();
        //  	    IINC rep = new IINC(idx, inc);
        ih.setInstruction(new ILOAD(idx));
        if (inc >= -1 && inc <= 5) {
            ih = il.append(ih, new ICONST(inc));
        } else if (inc >= -128 && inc < 127) {
            ih = il.append(ih, new BIPUSH((byte) inc));
        } else if (inc >= -32768 && inc < 32767) {
            ih = il.append(ih, new SIPUSH((short) inc));
        } else {
            System.out.println("IINC constant too big");
            System.exit(-1);
        }
        ih = il.append(ih, new IADD());
        ih = il.append(ih, new ISTORE(idx));
    }
    method.compile();
}