/// <summary>
/// Gets the trap objects.
/// </summary>
/// <param name="threadSafetyInterceptionPoint">The thread safety InterceptionPoint.</param>
/// <returns>Dictionary<Guid, HashSet<Trap>>.</returns>
private Dictionary <Guid, HashSet <Trap> > GetTrapObjects(ThreadSafetyInterceptionPoint threadSafetyInterceptionPoint)
{
string groupName = threadSafetyInterceptionPoint.ThreadSafetyGroup.Name;
Dictionary <Guid, HashSet <Trap> > trapObjects = null;
lock (this.trapPoints)
{
if (!this.trapPoints.ContainsKey(groupName))
{
this.trapPoints.Add(groupName, new Dictionary <Guid, HashSet <Trap> >());
}
trapObjects = this.trapPoints[groupName];
}
return(trapObjects);
}
/// <summary>
/// Get thread safety group details of the InterceptionPoint.
/// </summary>
/// <param name="interceptionPoint">InterceptionPoint.</param>
/// <returns>Thread safety InterceptionPoint.</returns>
private ThreadSafetyInterceptionPoint GetThreadSafetyInterceptionPoint(InterceptionPoint interceptionPoint)
{
if (this.threadSafetyInterceptionPointCache.ContainsKey(interceptionPoint.API))
{
return(this.threadSafetyInterceptionPointCache[interceptionPoint.API]);
}
foreach (ThreadSafetyGroup threadSafetyGroup in this.configuration.ThreadSafetyGroups)
{
foreach (string writeAPI in threadSafetyGroup.WriteAPIs)
{
if (SignatureMatchUtils.IsWildcardMatch(interceptionPoint.API, writeAPI))
{
var tsInterceptionPoint = new ThreadSafetyInterceptionPoint()
{
ThreadSafetyGroup = threadSafetyGroup,
IsWriteAPI = true,
};
this.threadSafetyInterceptionPointCache[interceptionPoint.API] = tsInterceptionPoint;
return(tsInterceptionPoint);
}
}
foreach (string readAPI in threadSafetyGroup.ReadAPIs)
{
if (SignatureMatchUtils.IsWildcardMatch(interceptionPoint.API, readAPI))
{
var tsInterceptionPoint = new ThreadSafetyInterceptionPoint()
{
ThreadSafetyGroup = threadSafetyGroup,
IsWriteAPI = false,
};
this.threadSafetyInterceptionPointCache[interceptionPoint.API] = tsInterceptionPoint;
return(tsInterceptionPoint);
}
}
}
return(null);
}
/// <summary>
/// Shoulds the return without trap.
/// </summary>
/// <param name="interceptionPoint">The InterceptionPoint.</param>
/// <param name="instance">The instance.</param>
/// <returns><see langword="true" /> if XXXX, <see langword="false" /> otherwise.</returns>
private bool ShouldReturnWithoutTrap(InterceptionPoint interceptionPoint, object instance)
{
// this.Updatelockinformation(InterceptionPoint);
if (this.LockRelatedOP(interceptionPoint))
{
return(true);
}
// Locate the APIs bypass the lock operation
ThreadSafetyInterceptionPoint threadSafetyInterceptionPoint = this.GetThreadSafetyInterceptionPoint(interceptionPoint);
if (threadSafetyInterceptionPoint == null)
{
return(true);
}
if (!threadSafetyInterceptionPoint.ThreadSafetyGroup.IsStatic && instance == null)
{
return(true);
}
return(false);
}
/// <summary>
/// Checks for bugs and start trap.
/// </summary>
/// <param name="interceptionPoint">The InterceptionPoint.</param>
/// <param name="threadSafetyInterceptionPoint">The thread safety InterceptionPoint.</param>
/// <param name="trapObjects">The trap objects.</param>
/// <param name="trapPlan">The trap plan.</param>
/// <param name="instance">The instance.</param>
/// <param name="bugFound">If set to <see langword="true" /> then a bug has been found.</param>
/// <returns>Trap.</returns>
private Trap CheckForBugsAndStartTrap(InterceptionPoint interceptionPoint, ThreadSafetyInterceptionPoint threadSafetyInterceptionPoint, Dictionary <Guid, HashSet <Trap> > trapObjects, TrapPlan trapPlan, object instance, out bool bugFound)
{
int danger = -1;
Semaphore semaphore = null;
double prob = 1.0;
int sleepDuration = 0;
Guid objectId = interceptionPoint.ObjID;
bool continueAfterBug = false;
bugFound = false;
Trap newTrap = null;
lock (trapObjects)
{
// Check if a thread-safety bug is found
if (trapObjects.ContainsKey(objectId))
{
foreach (Trap trap in trapObjects[objectId])
{
ThreadSafetyInterceptionPoint runningTP = this.GetThreadSafetyInterceptionPoint(trap.InterceptionPoint);
if (threadSafetyInterceptionPoint.IsWriteAPI || runningTP.IsWriteAPI)
{
bugFound = true;
interceptionPoint.StackTrace = Environment.StackTrace;
// DebugLog.Log("HitBug " + InterceptionPoint.Tostring() + " " + runningt.InterceptionPoint.Tostring());
ControllerHelper.WriteBug(trap, interceptionPoint);
this.LogBugForNextRun(interceptionPoint, trap.InterceptionPoint);
// For some InterceptionPoints, keep execution even hitting a bug. It may expose more bugs.
if ((trapPlan != null) && (!trapPlan.Repeat))
{
continueAfterBug = true;
}
}
}
}
if (bugFound && (!continueAfterBug))
{
// DebugLog.Log("HIt Bug and exit " + InterceptionPoint.Tostring());
return(null);
}
// else
{
// check if the InterceptionPoint match with dangerous list
danger = this.IsInsideDangerList(interceptionPoint.Location);
if ((danger < 0) && (!interceptionPoint.IsInPlan))
{
// exit when not matching and not in the plan
return(null);
}
// prepare to set up a trap if (threadSafetyInterceptionPoint.IsWriteAPI && !this.isTrapActive)
if ((!this.isTrapActive || (danger >= 0) || interceptionPoint.IsInPlan) && ((trapPlan != null) || threadSafetyInterceptionPoint.IsWriteAPI))
{
prob = trapPlan != null ? trapPlan.DelayProbability : this.DelayProbability;
if (danger >= 0)
{
prob = this.DelayProbabilityAtDangerousInterceptionPoint - (this.DecayFactor * danger);
}
if (this.random.NextDouble() <= prob)
{
// Get stack trace only if setting up a trap.
interceptionPoint.StackTrace = Environment.StackTrace;
semaphore = new Semaphore(0, 1);
sleepDuration = trapPlan == null?
this.random.Next(this.MaxDelayPerInterceptionPoint)
: trapPlan.FixedDelayMs;
if (danger >= 0)
{
sleepDuration = this.DelayPerDangerousInterceptionPoint;
}
newTrap = new Trap
{
ObjectId = objectId,
Semaphore = semaphore,
InterceptionPoint = interceptionPoint,
Delay = sleepDuration,
};
ControllerHelper.WriteTrap(newTrap);
if (!trapObjects.ContainsKey(objectId))
{
trapObjects.Add(objectId, new HashSet <Trap>());
}
trapObjects[objectId].Add(newTrap);
this.isTrapActive = true;
}
}
}
}
return(newTrap);
}
/// <summary>
/// Converts to rchpointstart.
/// </summary>
/// <param name="interceptionPoint">The InterceptionPoint.</param>
/// <param name="instance">The instance.</param>
/// <param name="parameters">The parameters.</param>
/// </summary>
public void InterceptionPointStart(InterceptionPoint interceptionPoint, object instance = null, object[] parameters = null)
{
/*
* I add more field variables to help the analysis. They are initialized in the constructor.
* when hitting a new InterceptionPoint here are the procedures in the implementation:
* 1.assign the hit-seq for InterceptionPoint
* 2.assign the global id for InterceptionPoint. It is duplicated with InterceptionPoint.id.
* 3.update the InterceptionPoints history to infer the concurrent threads.
* 4.find the dangerous pair for this InterceptionPoint
* 5.find the the opeartion set that happens-before this InterceptionPoint
* 6.check if find a bug
* 7.construct the trap
* 8.execute the trap
* 9.locate the threads that are blocked by this trap
*/
var newBugFound = false;
if (this.configuration == null || this.configuration.ThreadSafetyGroups == null)
{
return;
}
this.UpdateTPHitCounts(interceptionPoint);
TrapPlan trapPlan = this.TrapPlans.FindMatchingPlan(interceptionPoint, this.GlobalHitcountWindow, this.LocalHitcountWindow);
interceptionPoint.IsInPlan = trapPlan != null;
this.UpdateTPHistory(interceptionPoint);
// This block is used for monitoring the lock.Now we can just skip the lock operations. this.Updatelockinformation(InterceptionPoint);
if (this.LockRelatedOP(interceptionPoint))
{
return;
}
// Locate the APIs bypass the lock operation
ThreadSafetyInterceptionPoint threadSafetyInterceptionPoint = this.GetThreadSafetyInterceptionPoint(interceptionPoint);
if (threadSafetyInterceptionPoint == null ||
(!threadSafetyInterceptionPoint.ThreadSafetyGroup.IsStatic && instance == null))
{
return;
}
// update the write/read InterceptionPoint
interceptionPoint.IsWrite = threadSafetyInterceptionPoint.IsWriteAPI;
interceptionPoint.ObjID = threadSafetyInterceptionPoint.ThreadSafetyGroup.IsStatic ? ObjectId.GetRefId(null) : ObjectId.GetRefId(instance);
// this block will looking for the near-miss pair and learn the dependency.
if ((interceptionPoint.IsInPlan == false) && (this.DetectDangerousPairs == true))
{
this.FindRacingTP(interceptionPoint);
this.RemoveDependentInterceptionPoints(interceptionPoint);
}
var trapObjects = this.GetTrapObjects(threadSafetyInterceptionPoint);
Trap trap = this.CheckForBugsAndStartTrap(interceptionPoint, threadSafetyInterceptionPoint, trapObjects, trapPlan, instance, out newBugFound);
if (trap == null)
{
return;
}
this.FinishTrap(trapObjects, trap, interceptionPoint);
if (this.configuration.ThrowExceptionOnRace & newBugFound)
{
throw new Exception("ThreadSafety bugs detected by TSVD");
}
return;
}
/// <inheritdoc/>
public void InterceptionPointStart(InterceptionPoint interceptionPoint, object instance = null, object[] parameters = null)
{
/*
* if (!this.isTrapActive && bugFound)
* throw new Exception("ThreadSafety bugs detected by Torch");
*/
bool newTrapsAllowed = true;
bool newBugFound = false;
if (this.configuration == null || this.configuration.ThreadSafetyGroups == null)
{
return;
}
ThreadSafetyInterceptionPoint threadSafetyInterceptionPoint = ControllerHelper.GetThreadSafetyInterceptionPoint(this.configuration.ThreadSafetyGroups, interceptionPoint);
if (threadSafetyInterceptionPoint == null)
{
return;
}
if (!threadSafetyInterceptionPoint.ThreadSafetyGroup.IsStatic && instance == null)
{
return;
}
string groupName = threadSafetyInterceptionPoint.ThreadSafetyGroup.Name;
Dictionary <Guid, Trap> trapObjects = null;
lock (this.trapPoints)
{
if (!this.trapPoints.ContainsKey(groupName))
{
this.trapPoints.Add(groupName, new Dictionary <Guid, Trap>());
if (threadSafetyInterceptionPoint.IsWriteAPI)
{
this.writeTrapPoints.Add(groupName);
}
}
trapObjects = this.trapPoints[groupName];
}
Semaphore semaphore = null;
int sleepDuration = 0;
Guid keyInstance = ObjectId.GetRefId(null);
lock (trapObjects)
{
if (!threadSafetyInterceptionPoint.ThreadSafetyGroup.IsStatic)
{
keyInstance = ObjectId.GetRefId(instance);
}
// Check if a trap on this object is live
Trap trap = null;
trapObjects.TryGetValue(keyInstance, out trap);
// A bug is found if there is a trap on this object and
// either this access or trapped access is a write
if (trap != null &&
(threadSafetyInterceptionPoint.IsWriteAPI ||
trap.ThreadSafetyInterceptionPoint.IsWriteAPI))
{
// Get stack track when a bug is found.
interceptionPoint.StackTrace = Environment.StackTrace;
ControllerHelper.WriteBug(trap, interceptionPoint);
newBugFound = true;
try
{
trap.Semaphore.Release();
}
catch (SemaphoreFullException)
{
}
}
else if (newTrapsAllowed)
{
// prepare to set up a trap
if (!this.isTrapActive)
{
if (threadSafetyInterceptionPoint.IsWriteAPI && this.random.NextDouble() <= this.DelayProbability)
{
// Get stack trace only if setting up a trap.
interceptionPoint.StackTrace = Environment.StackTrace;
semaphore = new Semaphore(0, 1);
sleepDuration = this.random.Next(this.MaxDelayPerInterceptionPoint);
trap = new Trap
{
ObjectId = keyInstance.ToString(),
Semaphore = semaphore,
InterceptionPoint = interceptionPoint,
ThreadSafetyInterceptionPoint = threadSafetyInterceptionPoint,
Delay = sleepDuration,
};
ControllerHelper.WriteTrap(trap);
trapObjects.Add(keyInstance, trap);
this.isTrapActive = true;
}
}
}
}
if (semaphore != null)
{
semaphore.WaitOne(sleepDuration);
lock (trapObjects)
{
trapObjects.Remove(keyInstance);
}
this.isTrapActive = false;
}
if (this.configuration.ThrowExceptionOnRace && newBugFound)
{
throw new Exception("ThreadSafety bugs detected by Torch");
}
return;
}
