/** @return true iff 'this' is assigned to by the method */
public static boolean isThisAssigned(MethodData info) throws IllegalArgumentException {
if (info == null) {
throw new IllegalArgumentException();
}
ThisAssignmentChecker c = (ThisAssignmentChecker) info.getInfo(key);
if (c == null) {
c = new ThisAssignmentChecker(info);
info.putInfo(key, c);
}
return c.assignmentToThis;
}
private void recalculateFrom(MethodData info) {
assignmentToThis = false;
if (!info.getIsStatic()) {
IInstruction[] instructions = info.getInstructions();
for (int i = 0; i < instructions.length; i++) {
IInstruction instr = instructions[i];
if (instr instanceof StoreInstruction) {
StoreInstruction st = (StoreInstruction) instr;
if (st.getVarIndex() == 0) {
assignmentToThis = true;
}
}
}
}
}