private void createInitalNodesAndFlow(
final Map<PDGNode, Node> pdg2cfg, final ModRefCandidates modref, final PDG pdg) {
final Node nEntry = createNOPNode(pdg.entry);
this.entry = nEntry;
pdg2cfg.put(pdg.entry, nEntry);
final Node nExit = createNOPNode(pdg.exit);
this.exit = nExit;
pdg2cfg.put(pdg.exit, nExit);
for (final PDGField fref : pdg.getFieldReads()) {
if (!fref.field.isStatic()) {
final SSAInstruction instr = pdg.getInstruction(fref.node);
final ModRefFieldCandidate refCand = modref.createRefCandidate(pdg.cgNode, instr);
final Node n = createNode(refCand, fref.accfield, Node.Kind.READ);
pdg2cfg.put(fref.accfield, n);
}
}
for (final PDGField fmod : pdg.getFieldWrites()) {
if (!fmod.field.isStatic()) {
final SSAInstruction instr = pdg.getInstruction(fmod.node);
final ModRefFieldCandidate refCand = modref.createModCandidate(pdg.cgNode, instr);
final Node n = createNode(refCand, fmod.accfield, Node.Kind.WRITE);
pdg2cfg.put(fmod.accfield, n);
}
}
for (final PDGNode pn : pdg.vertexSet()) {
if (pn.getPdgId() == pdg.getId() && !pdg2cfg.containsKey(pn)) {
final Node n = createNOPNode(pn);
pdg2cfg.put(pn, n);
}
}
for (final PDGEdge e : pdg.edgeSet()) {
if (e.kind == PDGEdge.Kind.CONTROL_FLOW || e.kind == PDGEdge.Kind.CONTROL_FLOW_EXC) {
final Node from = pdg2cfg.get(e.from);
final Node to = pdg2cfg.get(e.to);
addEdge(from, to);
}
}
}
private void createActualInAndOut(
final Map<PDGNode, Node> pdg2cfg,
final ModRefCandidates modref,
final PDG pdg,
final CallGraph cg) {
for (final PDGNode call : pdg.getCalls()) {
final Node cn = pdg2cfg.get(call);
final SSAInvokeInstruction invk = (SSAInvokeInstruction) pdg.getInstruction(call);
final CallSiteReference site = invk.getCallSite();
final Set<ModRefFieldCandidate> modRefCands = new HashSet<ModRefFieldCandidate>();
for (final CGNode tgt : cg.getPossibleTargets(pdg.cgNode, site)) {
final InterProcCandidateModel tgtModRef = modref.getCandidates(tgt);
if (tgtModRef == null) {
continue;
}
for (final ModRefFieldCandidate c : tgtModRef) {
modRefCands.add(c);
}
}
final List<ModRefFieldCandidate> refs = new LinkedList<ModRefFieldCandidate>();
final List<ModRefFieldCandidate> mods = new LinkedList<ModRefFieldCandidate>();
for (final ModRefFieldCandidate c : modRefCands) {
if (c.isMod()) {
mods.add(c);
}
if (c.isRef()) {
refs.add(c);
}
}
addNodesBefore(cn, refs, Node.Kind.ACTUAL_IN);
addNodesAfter(cn, mods, Node.Kind.ACTUAL_OUT);
}
}
private void run(IProgressMonitor progress) throws CancelException {
final Map<PDGNode, PDGNode[]> entry2out = new HashMap<PDGNode, PDGNode[]>();
// add out nodes for each non-primitive parameter
for (final PDG pdg : sdg.getAllPDGs()) {
// primitive types nodes are null
final PDGNode[] formOuts = new PDGNode[pdg.params.length];
for (int i = 0; i < pdg.params.length; i++) {
final PDGNode formIn = pdg.params[i];
final TypeReference type = pdg.getParamType(i);
if (createOutputParamFor(type)) {
final PDGNode formOut =
pdg.addOutputFieldChildTo(
pdg.entry,
formIn.getLabel(),
formIn.getBytecodeName(),
formIn.getBytecodeIndex(),
formIn.getTypeRef());
formOuts[i] = formOut;
}
}
entry2out.put(pdg.entry, formOuts);
for (final PDGNode call : pdg.getCalls()) {
final PDGNode[] actIns = pdg.getParamIn(call);
final PDGNode[] actOuts = new PDGNode[actIns.length];
for (int i = 0; i < actIns.length; i++) {
final PDGNode actIn = actIns[i];
final TypeReference type = pdg.getParamType(call, i);
if (createOutputParamFor(type)) {
final PDGNode actOut =
pdg.addOutputFieldChildTo(
call,
actIn.getLabel(),
actIn.getBytecodeName(),
actIn.getBytecodeIndex(),
actIn.getTypeRef());
actOuts[i] = actOut;
}
}
entry2out.put(call, actOuts);
}
}
// connect form-outs of called procedures with act-outs
for (final PDG pdg : sdg.getAllPDGs()) {
for (final PDGNode call : pdg.getCalls()) {
final PDGNode[] actOuts = entry2out.get(call);
assert actOuts != null;
for (final PDGEdge out : pdg.outgoingEdgesOf(call)) {
if (out.kind == PDGEdge.Kind.CALL_STATIC || out.kind == PDGEdge.Kind.CALL_VIRTUAL) {
final PDGNode calleeEntry = out.to;
final PDGNode[] formOuts = entry2out.get(calleeEntry);
final PDG callee = sdg.getPDGforId(calleeEntry.getPdgId());
assert formOuts != null;
assert actOuts.length == formOuts.length;
for (int i = 0; i < actOuts.length; i++) {
final PDGNode actOut = actOuts[i];
if (actOut != null) {
// primitive type (and immutable type) params have no act out
callee.addVertex(actOut);
final PDGNode formOut = formOuts[i];
if (formOut != null) {
callee.addEdge(formOut, actOut, PDGEdge.Kind.PARAMETER_OUT);
}
}
}
}
}
}
}
// collect reachable points-to elements for reachable fields for each parameter
for (final PDG pdg : sdg.getAllPDGs()) {
final Map<PDGNode, OrdinalSet<InstanceKey>> node2ptsMod =
new HashMap<PDGNode, OrdinalSet<InstanceKey>>();
final Map<PDGNode, OrdinalSet<InstanceKey>> node2ptsRef =
new HashMap<PDGNode, OrdinalSet<InstanceKey>>();
final IR ir = pdg.cgNode.getIR();
if (ir == null) {
continue;
}
for (int i = 0; i < pdg.params.length; i++) {
if (!pdg.getParamType(i).isPrimitiveType()) {
final PDGNode formIn = pdg.params[i];
final int ssaVar = ir.getParameter(i);
if (ssaVar >= 0) {
final OrdinalSet<InstanceKey> ptsSet = findReachableInstances(pdg.cgNode, ssaVar);
node2ptsMod.put(formIn, ptsSet);
}
}
}
final PDGNode[] formOuts = entry2out.get(pdg.entry);
for (int i = 0; i < formOuts.length; i++) {
final PDGNode formOut = formOuts[i];
if (formOut != null) {
final PDGNode formIn = pdg.params[i];
final OrdinalSet<InstanceKey> ptsSet = node2ptsMod.get(formIn);
node2ptsRef.put(formOut, ptsSet);
}
}
final TypeReference retType = pdg.getMethod().getReturnType();
if (retType != TypeReference.Void && !retType.isPrimitiveType()) {
for (final PDGNode retNode : pdg.getReturns()) {
final SSAReturnInstruction ret = (SSAReturnInstruction) pdg.getInstruction(retNode);
final int ssaVar = ret.getResult();
final OrdinalSet<InstanceKey> ptsSet = findReachableInstances(pdg.cgNode, ssaVar);
node2ptsRef.put(retNode, ptsSet);
}
}
for (final PDGNode call : pdg.getCalls()) {
final PDGNode[] actIns = pdg.getParamIn(call);
final SSAAbstractInvokeInstruction invk =
(SSAAbstractInvokeInstruction) pdg.getInstruction(call);
for (int i = 0; i < actIns.length; i++) {
if (!pdg.getParamType(call, i).isPrimitiveType()) {
final PDGNode actIn = actIns[i];
final int ssaVar = invk.getUse(i);
if (ssaVar >= 0) {
final OrdinalSet<InstanceKey> ptsSet = findReachableInstances(pdg.cgNode, ssaVar);
node2ptsRef.put(actIn, ptsSet);
}
}
}
final PDGNode actOuts[] = entry2out.get(call);
for (int i = 0; i < actIns.length; i++) {
final PDGNode actOut = actOuts[i];
if (actOut != null) {
final PDGNode actIn = actIns[i];
final OrdinalSet<InstanceKey> ptsSet = node2ptsRef.get(actIn);
node2ptsMod.put(actOut, ptsSet);
}
}
final TypeReference callRetType = invk.getDeclaredTarget().getReturnType();
if (callRetType != TypeReference.Void && !callRetType.isPrimitiveType()) {
final int ssaVar = invk.getReturnValue(0);
final OrdinalSet<InstanceKey> ptsSet = findReachableInstances(pdg.cgNode, ssaVar);
final PDGNode retNode = pdg.getReturnOut(call);
node2ptsMod.put(retNode, ptsSet);
}
}
// create mod/ref sets for get & set instructions
for (final PDGField read : pdg.getFieldReads()) {
if (!read.field.isStatic()) {
if (read.field.isArray()) {
final SSAArrayLoadInstruction ali =
(SSAArrayLoadInstruction) pdg.getInstruction(read.node);
final int ssaVarBase = ali.getArrayRef();
if (ssaVarBase >= 0) {
final OrdinalSet<InstanceKey> ptsSet = pointsToArrayField(pdg.cgNode, ssaVarBase);
node2ptsRef.put(read.accfield, ptsSet);
}
} else {
final SSAGetInstruction get = (SSAGetInstruction) pdg.getInstruction(read.node);
final int ssaVarBase = get.getRef();
if (ssaVarBase >= 0) {
final IField field = sdg.getClassHierarchy().resolveField(get.getDeclaredField());
final OrdinalSet<InstanceKey> ptsSet =
pointsToObjectField(pdg.cgNode, ssaVarBase, field);
node2ptsRef.put(read.accfield, ptsSet);
}
}
// final SSAInstruction get = pdg.getInstruction(read.node);
// final int ssaVar = get.getDef();
// if (ssaVar >= 0) {
// final OrdinalSet<InstanceKey> ptsSet = findReachableInstances(pdg.cgNode, ssaVar);
// node2ptsRef.put(read.accfield, ptsSet);
// }
}
}
for (final PDGField write : pdg.getFieldWrites()) {
if (!write.field.isStatic()) {
if (write.field.isArray()) {
final SSAArrayStoreInstruction asi =
(SSAArrayStoreInstruction) pdg.getInstruction(write.node);
final int ssaVarBase = asi.getArrayRef();
if (ssaVarBase >= 0) {
final OrdinalSet<InstanceKey> ptsSet = pointsToArrayField(pdg.cgNode, ssaVarBase);
node2ptsMod.put(write.accfield, ptsSet);
}
} else {
final SSAPutInstruction put = (SSAPutInstruction) pdg.getInstruction(write.node);
final int ssaVarBase = put.getRef();
if (ssaVarBase >= 0) {
final IField field = sdg.getClassHierarchy().resolveField(put.getDeclaredField());
final OrdinalSet<InstanceKey> ptsSet =
pointsToObjectField(pdg.cgNode, ssaVarBase, field);
node2ptsMod.put(write.accfield, ptsSet);
}
}
}
}
// add data flow for each pdg
FlatHeapParamsDataFlow.compute(
pdg,
node2ptsMod,
node2ptsRef,
(sdg.cfg.accessPath ? PDGEdge.Kind.DATA_ALIAS : PDGEdge.Kind.DATA_HEAP),
progress);
}
}
