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

Example 1 with ALOAD

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

the class InsertSynchronized method synchronize.

private void synchronize(MethodInfo method) {
    MethodCode mc = method.getCode();
    InstructionList il = mc.getInstructionList();
    InstructionFinder f;
    // prepend monitorenter (reversed order of opcodes)
    il.insert(new MONITORENTER());
    if (method.isStatic()) {
        // il.insert(new GET_CURRENT_CLASS());
        throw new JavaClassFormatError("synchronized on static methods not yet supported");
    } else {
        il.insert(new ALOAD(0));
    }
    il.setPositions();
    f = new InstructionFinder(il);
    // find return instructions and insert monitorexit
    String retInstr = "ReturnInstruction";
    for (Iterator iterator = f.search(retInstr); iterator.hasNext(); ) {
        InstructionHandle[] match = (InstructionHandle[]) iterator.next();
        InstructionHandle ih = match[0];
        // handle for inserted sequence
        InstructionHandle newh;
        if (method.isStatic()) {
            // il.insert(ih, new GET_CURRENT_CLASS());
            throw new JavaClassFormatError("synchronized on static methods not yet supported");
        } else {
            // TODO this could become a bug if JCopter ever reassigns local variable slots, then
            // we could not be sure that slot 0 holds the this reference anymore.. To be on the safe side
            // we should check if there is an xSTORE_0 somewhere in the code
            newh = il.insert(ih, new ALOAD(0));
        }
        il.insert(ih, new MONITOREXIT());
        // correct jumps
        method.getCode().retarget(ih, newh);
    }
    il.setPositions();
    method.compile();
}