public static unsafe int RhpCalculateStackTraceWorker(IntPtr[] outputBuffer)
{
int nFrames = 0;
bool success = (outputBuffer != null);
StackFrameIterator frameIter = new StackFrameIterator();
bool isValid = frameIter.Init(null);
for (; isValid; isValid = frameIter.Next())
{
if (outputBuffer != null)
{
if (nFrames < outputBuffer.Length)
{
outputBuffer[nFrames] = new IntPtr(frameIter.ControlPC);
}
else
{
success = false;
}
}
nFrames++;
}
return(success ? nFrames : -nFrames);
}
private static unsafe int RhpCalculateStackTraceWorker(IntPtr *pOutputBuffer, uint outputBufferLength)
{
uint nFrames = 0;
bool success = true;
StackFrameIterator frameIter = new StackFrameIterator();
bool isValid = frameIter.Init(null);
Debug.Assert(isValid, "Missing RhGetCurrentThreadStackTrace frame");
// Note that the while loop will skip RhGetCurrentThreadStackTrace frame
while (frameIter.Next())
{
if (nFrames < outputBufferLength)
{
pOutputBuffer[nFrames] = new IntPtr(frameIter.ControlPC);
}
else
{
success = false;
}
nFrames++;
}
return(success ? (int)nFrames : -(int)nFrames);
}
private static bool FindFirstPassHandler(object exception, uint idxStart,
ref StackFrameIterator frameIter, out uint tryRegionIdx, out byte *pHandler)
{
pHandler = null;
tryRegionIdx = MaxTryRegionIdx;
EHEnum ehEnum;
byte * pbMethodStartAddress;
if (!InternalCalls.RhpEHEnumInitFromStackFrameIterator(ref frameIter, &pbMethodStartAddress, &ehEnum))
{
return(false);
}
byte *pbControlPC = frameIter.ControlPC;
uint codeOffset = (uint)(pbControlPC - pbMethodStartAddress);
uint lastTryStart = 0, lastTryEnd = 0;
// Search the clauses for one that contains the current offset.
RhEHClause ehClause;
for (uint curIdx = 0; InternalCalls.RhpEHEnumNext(&ehEnum, &ehClause); curIdx++)
{
//
// Skip to the starting try region. This is used by collided unwinds and rethrows to pickup where
// the previous dispatch left off.
//
if (idxStart != MaxTryRegionIdx)
{
if (curIdx <= idxStart)
{
lastTryStart = ehClause._tryStartOffset; lastTryEnd = ehClause._tryEndOffset;
continue;
}
// Now, we continue skipping while the try region is identical to the one that invoked the
// previous dispatch.
if ((ehClause._tryStartOffset == lastTryStart) && (ehClause._tryEndOffset == lastTryEnd))
{
continue;
}
}
RhEHClauseKind clauseKind = ehClause._clauseKind;
if (((clauseKind != RhEHClauseKind.RH_EH_CLAUSE_TYPED) &&
(clauseKind != RhEHClauseKind.RH_EH_CLAUSE_FILTER)) ||
!ehClause.ContainsCodeOffset(codeOffset))
{
continue;
}
// Found a containing clause. Because of the order of the clauses, we know this is the
// most containing.
if (clauseKind == RhEHClauseKind.RH_EH_CLAUSE_TYPED)
{
if (ShouldTypedClauseCatchThisException(exception, (EEType *)ehClause._pTargetType))
{
pHandler = ehClause._handlerAddress;
tryRegionIdx = curIdx;
return(true);
}
}
else
{
byte *pFilterFunclet = ehClause._filterAddress;
bool shouldInvokeHandler =
InternalCalls.RhpCallFilterFunclet(exception, pFilterFunclet, frameIter.RegisterSet);
if (shouldInvokeHandler)
{
pHandler = ehClause._handlerAddress;
tryRegionIdx = curIdx;
return(true);
}
}
}
return(false);
}
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");
object exceptionObj = exInfo.ThrownException;
// ------------------------------------------------
//
// First pass
//
// ------------------------------------------------
UIntPtr handlingFrameSP = MaxSP;
byte * pCatchHandler = null;
uint catchingTryRegionIdx = MaxTryRegionIdx;
bool isFirstRethrowFrame = (startIdx != MaxTryRegionIdx);
bool isFirstFrame = true;
byte * prevControlPC = null;
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;
}
prevControlPC = frameIter.ControlPC;
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,
(IntPtr)prevControlPC, // IP of the last frame that did not handle the exception
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");
FallbackFailFast(RhFailFastReason.InternalError, null);
}
public static unsafe int RhpCalculateStackTraceWorker(IntPtr[] outputBuffer)
{
int nFrames = 0;
bool success = (outputBuffer != null);
StackFrameIterator frameIter = new StackFrameIterator();
bool isValid = frameIter.Init(null);
for (; isValid; isValid = frameIter.Next())
{
if (outputBuffer != null)
{
if (nFrames < outputBuffer.Length)
outputBuffer[nFrames] = new IntPtr(frameIter.ControlPC);
else
success = false;
}
nFrames++;
}
return success ? nFrames : -nFrames;
}
internal static extern bool RhpSfiNext(ref StackFrameIterator pThis, out uint uExCollideClauseIdx, out bool fUnwoundReversePInvoke);
internal static extern unsafe bool RhpSfiInit(ref StackFrameIterator pThis, void* pStackwalkCtx);
internal unsafe extern static bool RhpEHEnumInitFromStackFrameIterator(ref StackFrameIterator pFrameIter, byte** pMethodStartAddress, void* pEHEnum);
internal static extern bool RhpSfiNext(ref StackFrameIterator pThis, out uint uExCollideClauseIdx, out bool fUnwoundReversePInvoke);
internal static extern unsafe bool RhpSfiInit(ref StackFrameIterator pThis, void *pStackwalkCtx, bool instructionFault);
internal extern static unsafe bool RhpEHEnumInitFromStackFrameIterator(ref StackFrameIterator pFrameIter, byte **pMethodStartAddress, void *pEHEnum);
private static bool FindFirstPassHandler(object exception, uint idxStart,
ref StackFrameIterator frameIter, out uint tryRegionIdx, out byte* pHandler)
{
pHandler = null;
tryRegionIdx = MaxTryRegionIdx;
EHEnum ehEnum;
byte* pbMethodStartAddress;
if (!InternalCalls.RhpEHEnumInitFromStackFrameIterator(ref frameIter, &pbMethodStartAddress, &ehEnum))
return false;
byte* pbControlPC = frameIter.ControlPC;
uint codeOffset = (uint)(pbControlPC - pbMethodStartAddress);
uint lastTryStart = 0, lastTryEnd = 0;
// Search the clauses for one that contains the current offset.
RhEHClause ehClause;
for (uint curIdx = 0; InternalCalls.RhpEHEnumNext(&ehEnum, &ehClause); curIdx++)
{
//
// Skip to the starting try region. This is used by collided unwinds and rethrows to pickup where
// the previous dispatch left off.
//
if (idxStart != MaxTryRegionIdx)
{
if (curIdx <= idxStart)
{
lastTryStart = ehClause._tryStartOffset; lastTryEnd = ehClause._tryEndOffset;
continue;
}
// Now, we continue skipping while the try region is identical to the one that invoked the
// previous dispatch.
if ((ehClause._tryStartOffset == lastTryStart) && (ehClause._tryEndOffset == lastTryEnd))
continue;
// We are done skipping. This is required to handle empty finally block markers that are used
// to separate runs of different try blocks with same native code offsets.
idxStart = MaxTryRegionIdx;
}
RhEHClauseKind clauseKind = ehClause._clauseKind;
if (((clauseKind != RhEHClauseKind.RH_EH_CLAUSE_TYPED) &&
(clauseKind != RhEHClauseKind.RH_EH_CLAUSE_FILTER))
|| !ehClause.ContainsCodeOffset(codeOffset))
{
continue;
}
// Found a containing clause. Because of the order of the clauses, we know this is the
// most containing.
if (clauseKind == RhEHClauseKind.RH_EH_CLAUSE_TYPED)
{
if (ShouldTypedClauseCatchThisException(exception, (EEType*)ehClause._pTargetType))
{
pHandler = ehClause._handlerAddress;
tryRegionIdx = curIdx;
return true;
}
}
else
{
byte* pFilterFunclet = ehClause._filterAddress;
bool shouldInvokeHandler =
InternalCalls.RhpCallFilterFunclet(exception, pFilterFunclet, frameIter.RegisterSet);
if (shouldInvokeHandler)
{
pHandler = ehClause._handlerAddress;
tryRegionIdx = curIdx;
return true;
}
}
}
return false;
}
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");
object exceptionObj = exInfo.ThrownException;
// ------------------------------------------------
//
// First pass
//
// ------------------------------------------------
UIntPtr handlingFrameSP = MaxSP;
byte* pCatchHandler = null;
uint catchingTryRegionIdx = MaxTryRegionIdx;
bool isFirstRethrowFrame = (startIdx != MaxTryRegionIdx);
bool isFirstFrame = true;
byte* prevControlPC = null;
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;
prevControlPC = frameIter.ControlPC;
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,
(IntPtr)prevControlPC, // IP of the last frame that did not handle the exception
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");
FallbackFailFast(RhFailFastReason.InternalError, null);
}
private static unsafe int RhpCalculateStackTraceWorker(IntPtr * pOutputBuffer, uint outputBufferLength)
{
uint nFrames = 0;
bool success = true;
StackFrameIterator frameIter = new StackFrameIterator();
bool isValid = frameIter.Init(null);
Debug.Assert(isValid, "Missing RhGetCurrentThreadStackTrace frame");
// Note that the while loop will skip RhGetCurrentThreadStackTrace frame
while (frameIter.Next())
{
if (nFrames < outputBufferLength)
pOutputBuffer[nFrames] = new IntPtr(frameIter.ControlPC);
else
success = false;
nFrames++;
}
return success ? (int)nFrames : -(int)nFrames;
}
internal static extern unsafe bool RhpSfiNext(ref StackFrameIterator pThis, uint *uExCollideClauseIdx, bool *fUnwoundReversePInvoke);
internal static extern unsafe bool RhpSfiInit(ref StackFrameIterator pThis, void *pStackwalkCtx);
