private BlockDataFlowState generateDFState(CFGBlock block) {
int totalGlobals = this.uniqueGlobals.get(block.getMethodName()).size();
// Get the original inBitSet for this block
BitSet origIn;
if (this.cfgBlocksState.containsKey(block)) {
origIn = this.cfgBlocksState.get(block).getIn();
} else {
origIn = new BitSet(totalGlobals);
origIn.set(0, totalGlobals);
}
// Calculate the in BitSet by taking intersection of predecessors
BlockDataFlowState bFlow = new BlockDataFlowState(totalGlobals);
// If there exist at least one successor, set Out to all True
if (block.getSuccessors().size() > 0) {
bFlow.getOut().set(0, totalGlobals);
}
BitSet out = bFlow.getOut();
for (CFGBlock pred : block.getSuccessors()) {
if (this.cfgBlocksState.containsKey(pred)) {
out.and(this.cfgBlocksState.get(pred).getIn());
}
}
calculateGenKillSets(block, bFlow);
// Calculate Out
BitSet in = bFlow.getIn(); // IN = (OUT - KILL) U GEN
in.or(out);
in.xor(bFlow.getKill());
in.or(bFlow.getGen());
if (!in.equals(origIn)) {
// Add successors to cfgBlocks list
for (CFGBlock pred : block.getPredecessors()) {
if (!cfgBlocksToProcess.contains(pred)) {
cfgBlocksToProcess.add(pred);
}
}
}
// Remove this block, since it has been processed
cfgBlocksToProcess.remove(block);
return bFlow;
}
private void setExitBlock(String methodName) {
for (CFGBlock block : this.mMap.get(methodName).getCfgBlocks()) {
if (block.getSuccessors().size() == 0) {
// return block;
CFGBlock exit = block;
BlockDataFlowState entryBlockFlow =
new BlockDataFlowState(
this.uniqueGlobals.get(methodName).size()); // IN = GEN for entry block
calculateGenKillSets(exit, entryBlockFlow);
entryBlockFlow.setIn(entryBlockFlow.getGen());
cfgBlocksToProcess.remove(exit);
this.cfgBlocksState.put(exit, entryBlockFlow);
}
}
}