// Scan the method.
BytecodeScanner scanner = new BytecodeScanner();
scanner.scan(instructionList, callback);
UnpackedCode unpackedCode = callback.getUnpackedCode();
BitSet result = null;
if (unpackedCode != null) {
result = unpackedCode.getBytecodeSet();
}
cachedBitsets().put(xmethod, result);
return result;
}