private static IntPtr CheckStaticClassConstructionReturnNonGCStaticBase(ref StaticClassConstructionContext context, IntPtr nonGcStaticBase)
{
// CORERT-TODO: Early out if initializer was set to anything. The runner doesn't handle recursion and assumes it's access from
// a different thread and deadlocks itself. CoreRT will cause recursion for things like trying to get a static
// base from the CCtor (which means that pretty much all cctors will deadlock).
if (context.initialized == 0)
{
CheckStaticClassConstruction(ref context);
}
return(nonGcStaticBase);
}
private static unsafe void CheckStaticClassConstruction(ref StaticClassConstructionContext context)
{
// Very simplified class constructor runner. In real world, the class constructor runner
// would need to be able to deal with potentially multiple threads racing to initialize
// a single class, and would need to be able to deal with potential deadlocks
// between class constructors.
if (context.initialized == 1)
{
return;
}
context.initialized = 1;
// Run the class constructor.
Call <int>(context.cctorMethodAddress);
}
private unsafe static IntPtr CheckStaticClassConstructionReturnNonGCStaticBase(ref StaticClassConstructionContext context, IntPtr nonGcStaticBase)
{
CheckStaticClassConstruction(ref context);
return(nonGcStaticBase);
}
private unsafe static object CheckStaticClassConstructionReturnGCStaticBase(ref StaticClassConstructionContext context, object gcStaticBase)
{
CheckStaticClassConstruction(ref context);
return(gcStaticBase);
}
public static unsafe void* EnsureClassConstructorRun(void* returnValue, StaticClassConstructionContext* pContext)
{
IntPtr pfnCctor = pContext->cctorMethodAddress;
NoisyLog("EnsureClassConstructorRun, cctor={0}, thread={1}", pfnCctor, CurrentManagedThreadId);
// If we were called from MRT, this check is redundant but harmless. This is in case someone within classlib
// (cough, Reflection) needs to call this explicitly.
if (pContext->initialized == 1)
{
NoisyLog("Cctor already run, cctor={0}, thread={1}", pfnCctor, CurrentManagedThreadId);
return returnValue;
}
CctorHandle cctor = Cctor.GetCctor(pContext);
Cctor[] cctors = cctor.Array;
int cctorIndex = cctor.Index;
try
{
Lock cctorLock = cctors[cctorIndex].Lock;
if (DeadlockAwareAcquire(cctor, pfnCctor))
{
int currentManagedThreadId = CurrentManagedThreadId;
try
{
NoisyLog("Acquired cctor lock, cctor={0}, thread={1}", pfnCctor, currentManagedThreadId);
cctors[cctorIndex].HoldingThread = currentManagedThreadId;
if (pContext->initialized == 0) // Check again in case some thread raced us while we were acquiring the lock.
{
TypeInitializationException priorException = cctors[cctorIndex].Exception;
if (priorException != null)
throw priorException;
try
{
NoisyLog("Calling cctor, cctor={0}, thread={1}", pfnCctor, currentManagedThreadId);
Call<int>(pfnCctor);
// Insert a memory barrier here to order any writes executed as part of static class
// construction above with respect to the initialized flag update we're about to make
// below. This is important since the fast path for checking the cctor uses a normal read
// and doesn't come here so without the barrier it could observe initialized == 1 but
// still see uninitialized static fields on the class.
Interlocked.MemoryBarrier();
NoisyLog("Set type inited, cctor={0}, thread={1}", pfnCctor, currentManagedThreadId);
pContext->initialized = 1;
}
catch (Exception e)
{
TypeInitializationException wrappedException = new TypeInitializationException(null, SR.TypeInitialization_Type_NoTypeAvailable, e);
cctors[cctorIndex].Exception = wrappedException;
throw wrappedException;
}
}
}
finally
{
cctors[cctorIndex].HoldingThread = ManagedThreadIdNone;
NoisyLog("Releasing cctor lock, cctor={0}, thread={1}", pfnCctor, currentManagedThreadId);
cctorLock.Release();
}
}
else
{
// Cctor cycle resulted in a deadlock. We will break the guarantee and return without running the
// .cctor.
}
}
finally
{
Cctor.Release(cctor);
}
NoisyLog("EnsureClassConstructorRun complete, cctor={0}, thread={1}", pfnCctor, CurrentManagedThreadId);
return returnValue;
}
//==========================================================================================================
// Gets the Cctor entry associated with a specific class constructor context (creating it if necessary.)
//==========================================================================================================
public static CctorHandle GetCctor(StaticClassConstructionContext* pContext)
{
#if DEBUG
const int Grow = 2;
#else
const int Grow = 10;
#endif
s_cctorGlobalLock.Acquire();
try
{
Cctor[] resultArray = null;
int resultIndex = -1;
if (s_count != 0)
{
// Search for the cctor context in our existing arrays
for (int cctorIndex = 0; cctorIndex < s_cctorArraysCount; ++cctorIndex)
{
Cctor[] segment = s_cctorArrays[cctorIndex];
for (int i = 0; i < segment.Length; i++)
{
if (segment[i]._pContext == pContext)
{
resultArray = segment;
resultIndex = i;
break;
}
}
if (resultArray != null)
break;
}
}
if (resultArray == null)
{
// look for an empty entry in an existing array
for (int cctorIndex = 0; cctorIndex < s_cctorArraysCount; ++cctorIndex)
{
Cctor[] segment = s_cctorArrays[cctorIndex];
for (int i = 0; i < segment.Length; i++)
{
if (segment[i]._pContext == default(StaticClassConstructionContext*))
{
resultArray = segment;
resultIndex = i;
break;
}
}
if (resultArray != null)
break;
}
if (resultArray == null)
{
// allocate a new array
resultArray = new Cctor[Grow];
if (s_cctorArraysCount == s_cctorArrays.Length)
{
// grow the container
Array.Resize(ref s_cctorArrays, (s_cctorArrays.Length * 2) + 1);
}
// store the array in the container, this cctor gets index 0
s_cctorArrays[s_cctorArraysCount] = resultArray;
s_cctorArraysCount++;
resultIndex = 0;
}
Debug.Assert(resultArray[resultIndex]._pContext == default(StaticClassConstructionContext*));
resultArray[resultIndex]._pContext = pContext;
resultArray[resultIndex].Lock = new Lock();
s_count++;
}
Interlocked.Increment(ref resultArray[resultIndex]._refCount);
return new CctorHandle(resultArray, resultIndex);
}
finally
{
s_cctorGlobalLock.Release();
}
}
private unsafe static IntPtr CheckStaticClassConstructionReturnNonGCStaticBase(StaticClassConstructionContext* context, IntPtr nonGcStaticBase)
{
EnsureClassConstructorRun(context);
return nonGcStaticBase;
}
private unsafe static object CheckStaticClassConstructionReturnGCStaticBase(StaticClassConstructionContext* context, object gcStaticBase)
{
EnsureClassConstructorRun(context);
return gcStaticBase;
}
public static unsafe void* CheckStaticClassConstruction(void* returnValue, StaticClassConstructionContext* pContext)
{
EnsureClassConstructorRun(pContext);
return returnValue;
}
private unsafe static object CheckStaticClassConstructionReturnThreadStaticBase(TypeManagerSlot* pModuleData, Int32 typeTlsIndex, StaticClassConstructionContext* context)
{
object threadStaticBase = ThreadStatics.GetThreadStaticBaseForType(pModuleData, typeTlsIndex);
EnsureClassConstructorRun(context);
return threadStaticBase;
}
private static unsafe IntPtr CheckStaticClassConstructionReturnNonGCStaticBase(ref StaticClassConstructionContext context, IntPtr nonGcStaticBase)
{
EnsureClassConstructorRun(ref context);
return(nonGcStaticBase);
}