FlowFunction<CfgNode<?>, CfgEdge, Cfg, CopyAssumption> {
@Override
public void interpret(CfgNode<?> node,
Cfg g, AssumptionMap<CfgEdge, CopyAssumption> assumptionMap) {
CopyAssumption in = AssumptionUtil.join(g.getInEdges(node), assumptionMap);
final Updater result = new Updater(in);
node.accept(new CfgVisitor() {
@Override
public void visitReadWriteNode(CfgReadWriteNode node) {
JVariable targetVariable = node.getTargetVariable();
if (isSupportedVar(targetVariable)) {
result.kill(targetVariable);
}
}
@Override
public void visitWriteNode(CfgWriteNode node) {
JVariable targetVariable = node.getTargetVariable();
if (!isSupportedVar(targetVariable)) {
return;
}
if (!(node.getValue() instanceof JVariableRef)) {
result.kill(targetVariable);
return;
}
JVariable original = ((JVariableRef) node.getValue()).getTarget();
original = result.getMostOriginal(original);
if (original != targetVariable) {
result.kill(targetVariable);
if (isSupportedVar(original) &&
original.getType() == targetVariable.getType()) {
result.addCopy(original, targetVariable);
}
} else {
// We don't have to kill any assumptions after i = i assignment.
}
}
private boolean isSupportedVar(JVariable targetVariable) {
return targetVariable instanceof JParameter ||
targetVariable instanceof JLocal;
}
});
AssumptionUtil.setAssumptions(g.getOutEdges(node), result.unwrap(), assumptionMap);
}