public static void RhRethrow(ref ExInfo activeExInfo, ref ExInfo exInfo)
{
// trigger a GC (only if gcstress) to ensure we can stackwalk at this point
GCStress.TriggerGC();
InternalCalls.RhpValidateExInfoStack();
// We need to copy the Exception object to this stack location because collided unwinds will cause
// the original stack location to go dead.
Exception rethrownException = activeExInfo.ThrownException;
exInfo.Init(rethrownException, ref activeExInfo);
DispatchEx(ref exInfo._frameIter, ref exInfo, activeExInfo._idxCurClause);
BinderIntrinsics.DebugBreak();
}
public static void RhThrowHwEx(uint exceptionCode, ref ExInfo exInfo)
{
// trigger a GC (only if gcstress) to ensure we can stackwalk at this point
GCStress.TriggerGC();
InternalCalls.RhpValidateExInfoStack();
IntPtr faultingCodeAddress = exInfo._pExContext->IP;
ExceptionIDs exceptionId;
switch (exceptionCode)
{
case (uint)HwExceptionCode.STATUS_REDHAWK_NULL_REFERENCE:
exceptionId = ExceptionIDs.NullReference;
break;
case (uint)HwExceptionCode.STATUS_DATATYPE_MISALIGNMENT:
exceptionId = ExceptionIDs.DataMisaligned;
break;
// N.B. -- AVs that have a read/write address lower than 64k are already transformed to
// HwExceptionCode.REDHAWK_NULL_REFERENCE prior to calling this routine.
case (uint)HwExceptionCode.STATUS_ACCESS_VIOLATION:
exceptionId = ExceptionIDs.AccessViolation;
break;
case (uint)HwExceptionCode.STATUS_INTEGER_DIVIDE_BY_ZERO:
exceptionId = ExceptionIDs.DivideByZero;
break;
default:
// We don't wrap SEH exceptions from foreign code like CLR does, so we believe that we
// know the complete set of HW faults generated by managed code and do not need to handle
// this case.
FailFastViaClasslib(RhFailFastReason.InternalError, null, faultingCodeAddress);
exceptionId = ExceptionIDs.NullReference;
break;
}
Exception exceptionToThrow = GetClasslibException(exceptionId, faultingCodeAddress);
exInfo.Init(exceptionToThrow);
DispatchEx(ref exInfo._frameIter, ref exInfo, MaxTryRegionIdx);
BinderIntrinsics.DebugBreak();
}
public static void RhThrowEx(Exception exceptionObj, ref ExInfo exInfo)
{
// trigger a GC (only if gcstress) to ensure we can stackwalk at this point
GCStress.TriggerGC();
InternalCalls.RhpValidateExInfoStack();
// Transform attempted throws of null to a throw of NullReferenceException.
if (exceptionObj == null)
{
IntPtr faultingCodeAddress = exInfo._pExContext->IP;
exceptionObj = GetClasslibException(ExceptionIDs.NullReference, faultingCodeAddress);
}
exInfo.Init(exceptionObj);
DispatchEx(ref exInfo._frameIter, ref exInfo, MaxTryRegionIdx);
BinderIntrinsics.DebugBreak();
}
private static void DispatchEx(ref StackFrameIterator frameIter, ref ExInfo exInfo, uint startIdx)
{
Debug.Assert(exInfo._passNumber == 1, "expected asm throw routine to set the pass");
Exception exceptionObj = exInfo.ThrownException;
// ------------------------------------------------
//
// First pass
//
// ------------------------------------------------
UIntPtr handlingFrameSP = MaxSP;
byte * pCatchHandler = null;
uint catchingTryRegionIdx = MaxTryRegionIdx;
bool isFirstRethrowFrame = (startIdx != MaxTryRegionIdx);
bool isFirstFrame = true;
UIntPtr prevFramePtr = UIntPtr.Zero;
bool unwoundReversePInvoke = false;
bool isValid = frameIter.Init(exInfo._pExContext);
Debug.Assert(isValid, "RhThrowEx called with an unexpected context");
DebuggerNotify.BeginFirstPass(exceptionObj, frameIter.ControlPC, frameIter.SP);
for (; isValid; isValid = frameIter.Next(out startIdx, out unwoundReversePInvoke))
{
// For GC stackwalking, we'll happily walk across native code blocks, but for EH dispatch, we
// disallow dispatching exceptions across native code.
if (unwoundReversePInvoke)
{
break;
}
DebugScanCallFrame(exInfo._passNumber, frameIter.ControlPC, frameIter.SP);
// A debugger can subscribe to get callbacks at a specific frame of exception dispatch
// exInfo._notifyDebuggerSP can be populated by the debugger from out of process
// at any time.
if (exInfo._notifyDebuggerSP == frameIter.SP)
{
DebuggerNotify.FirstPassFrameEntered(exceptionObj, frameIter.ControlPC, frameIter.SP);
}
UpdateStackTrace(exceptionObj, ref exInfo, ref isFirstRethrowFrame, ref prevFramePtr, ref isFirstFrame);
byte *pHandler;
if (FindFirstPassHandler(exceptionObj, startIdx, ref frameIter,
out catchingTryRegionIdx, out pHandler))
{
handlingFrameSP = frameIter.SP;
pCatchHandler = pHandler;
DebugVerifyHandlingFrame(handlingFrameSP);
break;
}
}
DebuggerNotify.EndFirstPass(exceptionObj, pCatchHandler, handlingFrameSP);
if (pCatchHandler == null)
{
UnhandledExceptionFailFastViaClasslib(
RhFailFastReason.PN_UnhandledException,
exceptionObj,
ref exInfo);
}
// We FailFast above if the exception goes unhandled. Therefore, we cannot run the second pass
// without a catch handler.
Debug.Assert(pCatchHandler != null, "We should have a handler if we're starting the second pass");
DebuggerNotify.BeginSecondPass();
// ------------------------------------------------
//
// Second pass
//
// ------------------------------------------------
// Due to the stackwalker logic, we cannot tolerate triggering a GC from the dispatch code once we
// are in the 2nd pass. This is because the stackwalker applies a particular unwind semantic to
// 'collapse' funclets which gets confused when we walk out of the dispatch code and encounter the
// 'main body' without first encountering the funclet. The thunks used to invoke 2nd-pass
// funclets will always toggle this mode off before invoking them.
InternalCalls.RhpSetThreadDoNotTriggerGC();
exInfo._passNumber = 2;
startIdx = MaxTryRegionIdx;
isValid = frameIter.Init(exInfo._pExContext);
for (; isValid && ((byte *)frameIter.SP <= (byte *)handlingFrameSP); isValid = frameIter.Next(out startIdx))
{
Debug.Assert(isValid, "second-pass EH unwind failed unexpectedly");
DebugScanCallFrame(exInfo._passNumber, frameIter.ControlPC, frameIter.SP);
if (frameIter.SP == handlingFrameSP)
{
// invoke only a partial second-pass here...
InvokeSecondPass(ref exInfo, startIdx, catchingTryRegionIdx);
break;
}
InvokeSecondPass(ref exInfo, startIdx);
}
// ------------------------------------------------
//
// Call the handler and resume execution
//
// ------------------------------------------------
exInfo._idxCurClause = catchingTryRegionIdx;
InternalCalls.RhpCallCatchFunclet(
exceptionObj, pCatchHandler, frameIter.RegisterSet, ref exInfo);
// currently, RhpCallCatchFunclet will resume after the catch
Debug.Assert(false, "unreachable");
BinderIntrinsics.DebugBreak();
}
internal static void FailFast(RhFailFastReason reason, Exception unhandledException)
{
BinderIntrinsics.DebugBreak();
}
