private void updateKillGenSet(String methodName, CallStmt stmt, BlockDataFlowState bFlow) {
if (stmt.getMethodLabel().equals(ProgramFlattener.exceptionHandlerLabel)) return;
// Kill all stores!
for (int i = 0; i < bFlow.getOut().size(); i++) {
if (bFlow.getOut().get(i)) {
bFlow.getKill().set(i);
}
}
bFlow.getGen().clear();
}
private void optimize(CFGBlock block) {
BlockDataFlowState bFlow = assignmentDefGenerator.getBlockAssignReachingDefs().get(block);
QuadrupletStmt qStmt;
PopStmt popStmt;
PushStmt pushStmt;
CmpStmt cStmt;
Name newArg1, newArg2, dest;
for (LIRStatement stmt : block.getStatements()) {
// Reset kill set
bFlow.getKill().clear();
if (stmt.getClass().equals(CallStmt.class)) {
CallStmt callStmt = (CallStmt) stmt;
if (callStmt.getMethodLabel().equals(ProgramFlattener.exceptionHandlerLabel)) continue;
// Update BlockDataFlowState kill set
assignmentDefGenerator.invalidateFunctionCall(bFlow);
// Update BlockDataFlowState in set by using updated kill set
bFlow.getIn().xor(bFlow.getKill());
} else if (stmt.getClass().equals(QuadrupletStmt.class)) {
qStmt = (QuadrupletStmt) stmt;
newArg1 = copyPropagateOnArg(qStmt.getArg1(), bFlow);
if (newArg1 != null) {
qStmt.setArg1(newArg1);
}
newArg2 = copyPropagateOnArg(qStmt.getArg2(), bFlow);
if (newArg2 != null) {
qStmt.setArg2(newArg2);
}
dest = qStmt.getDestination();
if (dest != null) {
// Check if dest is ArrayName and try to optimize index
if (dest.getClass().equals(ArrayName.class)) {
Name arrIndex = ((ArrayName) dest).getIndex();
Name propagatedName = copyPropagateOnArg(arrIndex, bFlow);
if (propagatedName != null) ((ArrayName) dest).setIndex(propagatedName);
}
}
// Update BlockDataFlowState kill set
assignmentDefGenerator.updateKillGenSet(dest, bFlow);
// Update BlockDataFlowState in set by using updated kill set
bFlow.getIn().xor(bFlow.getKill());
// Optimize PopStmt
} else if (stmt.getClass().equals(PopStmt.class)) {
popStmt = (PopStmt) stmt;
newArg1 = copyPropagateOnArg(popStmt.getName(), bFlow);
if (newArg1 != null) {
popStmt.setName(newArg1);
}
// Optimize PushStmt
} else if (stmt.getClass().equals(PushStmt.class)) {
pushStmt = (PushStmt) stmt;
newArg1 = copyPropagateOnArg(pushStmt.getName(), bFlow);
if (newArg1 != null) {
pushStmt.setName(newArg1);
}
// Optimize CmpStmt
} else if (stmt.getClass().equals(CmpStmt.class)) {
cStmt = (CmpStmt) stmt;
newArg1 = copyPropagateOnArg(cStmt.getArg1(), bFlow);
if (newArg1 != null) {
cStmt.setArg1(newArg1);
}
newArg2 = copyPropagateOnArg(cStmt.getArg2(), bFlow);
if (newArg2 != null) {
cStmt.setArg2(newArg2);
}
}
}
}