Package edu.umd.cs.findbugs.ba

Examples of edu.umd.cs.findbugs.ba.LockDataflow

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        ValueNumberDataflow vnaDataflow = getValueNumberDataflow(analysisCache, descriptor);
        DepthFirstSearch dfs = getDepthFirstSearch(analysisCache, descriptor);
        CFG cfg = getCFG(analysisCache, descriptor);

        LockAnalysis analysis = new LockAnalysis(methodGen, vnaDataflow, dfs);
        LockDataflow dataflow = new LockDataflow(cfg, analysis);
        dataflow.execute();
        return dataflow;

    }
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    private void analyzeMethod(ClassContext classContext, Method method) throws CFGBuilderException, DataflowAnalysisException {

        MethodGen methodGen = classContext.getMethodGen(method);
        CFG cfg = classContext.getCFG(method);
        LockDataflow dataflow = classContext.getLockDataflow(method);

        for (Iterator<Location> j = cfg.locationIterator(); j.hasNext();) {
            Location location = j.next();
            visitLocation(classContext, location, methodGen, dataflow);
        }
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        // (2) to check for NEW and Invoke instructions that might create an
        // object
        //
        // We ignore matches where a lock is held consistently,
        // or if the extent does not appear to create a new object.
        LockDataflow lockDataflow = classContext.getLockDataflow(method);
        LockSet lockSet = null;
        boolean sawNEW = false, sawINVOKE = false;
        for (BasicBlock block : cfg.getBlocks(extent)) {
            for (Iterator<InstructionHandle> j = block.instructionIterator(); j.hasNext();) {
                InstructionHandle handle = j.next();
                if (handle.equals(store.getMatchedInstructionInstructionHandle())) {
                    break;
                }
                Location location = new Location(handle, block);

                // Keep track of whether we saw any instructions
                // that might actually have created a new object.
                Instruction ins = handle.getInstruction();
                if (DEBUG) {
                    System.out.println(location);
                }
                if (ins instanceof AllocationInstruction) {
                    sawNEW = true;
                } else if (ins instanceof InvokeInstruction) {
                    if (ins instanceof INVOKESTATIC
                            && ((INVOKESTATIC) ins).getMethodName(classContext.getConstantPoolGen()).startsWith("new")) {
                        sawNEW = true;
                    }
                    sawINVOKE = true;
                }

                // Compute lock set intersection for all matched
                // instructions.
                LockSet insLockSet = lockDataflow.getFactAtLocation(location);
                if (lockSet == null) {
                    lockSet = new LockSet();
                    lockSet.copyFrom(insLockSet);
                } else {
                    lockSet.intersectWith(insLockSet);
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    private void analyzeMethod(ClassContext classContext, Method method) throws CFGBuilderException, DataflowAnalysisException {
        // System.out.println("Checking " + method);

        CFG cfg = classContext.getCFG(method);
        LockDataflow lockDataflow = classContext.getLockDataflow(method);

        for (Iterator<Location> i = cfg.locationIterator(); i.hasNext();) {
            Location location = i.next();
            Instruction ins = location.getHandle().getInstruction();

            if (!(ins instanceof INVOKESTATIC)) {
                continue;
            }

            if (!isSleep((INVOKESTATIC) ins, classContext.getConstantPoolGen())) {
                continue;
            }

            // System.out.println("Found sleep at " + location.getHandle());

            LockSet lockSet = lockDataflow.getFactAtLocation(location);
            if (lockSet.getNumLockedObjects() > 0) {
                bugAccumulator.accumulateBug(
                        new BugInstance(this, "SWL_SLEEP_WITH_LOCK_HELD", NORMAL_PRIORITY).addClassAndMethod(
                                classContext.getJavaClass(), method), classContext, method, location);
            }
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            return;
        }
        ConstantPoolGen cpg = methodGen.getConstantPool();
        CFG cfg = classContext.getCFG(method);
        ValueNumberDataflow vnaDataflow = classContext.getValueNumberDataflow(method);
        LockDataflow dataflow = classContext.getLockDataflow(method);

        for (Iterator<Location> i = cfg.locationIterator(); i.hasNext();) {
            Location location = i.next();

            InstructionHandle handle = location.getHandle();

            Instruction ins = handle.getInstruction();
            if (!(ins instanceof INVOKEVIRTUAL)) {
                continue;
            }
            INVOKEVIRTUAL inv = (INVOKEVIRTUAL) ins;

            String methodName = inv.getName(cpg);
            String methodSig = inv.getSignature(cpg);

            if (Hierarchy.isMonitorWait(methodName, methodSig) || Hierarchy.isMonitorNotify(methodName, methodSig)) {
                int numConsumed = inv.consumeStack(cpg);
                if (numConsumed == Constants.UNPREDICTABLE) {
                    throw new DataflowAnalysisException("Unpredictable stack consumption", methodGen, handle);
                }

                ValueNumberFrame frame = vnaDataflow.getFactAtLocation(location);
                if (!frame.isValid()) {
                    // Probably dead code
                    continue;
                }
                if (frame.getStackDepth() - numConsumed < 0) {
                    throw new DataflowAnalysisException("Stack underflow", methodGen, handle);
                }
                ValueNumber ref = frame.getValue(frame.getNumSlots() - numConsumed);
                LockSet lockSet = dataflow.getFactAtLocation(location);
                int lockCount = lockSet.getLockCount(ref.getNumber());

                if (lockCount == 0) {
                    Collection<ValueNumber> lockedValueNumbers = lockSet.getLockedValueNumbers(frame);
                    boolean foundMatch = false;
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Related Classes of edu.umd.cs.findbugs.ba.LockDataflow

  • edu.umd.cs.findbugs.classfile.engine.bcel.LockDataflowFactory
  • edu.umd.cs.findbugs.detect.FindMismatchedWaitOrNotify
  • edu.umd.cs.findbugs.detect.FindSleepWithLockHeld
  • edu.umd.cs.findbugs.detect.FindTwoLockWait
  • edu.umd.cs.findbugs.detect.LazyInit
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