__declspec(guard(ignore)) void *_CallCatchBlock2(
EHRegistrationNode *pRN, // Dynamic info of function with catch
FuncInfo *pFuncInfo, // Static info of function with catch
void *handlerAddress, // Code address of handler
int CatchDepth, // How deeply nested in catch blocks are we?
unsigned long NLGCode
) {
EHTRACE_ENTER;
//
// First, create and link in our special guard node:
//
CatchGuardRN CGRN = { nullptr,
(void*)_CatchGuardHandler,
__security_cookie ^ (UINT_PTR)&CGRN,
pFuncInfo,
pRN,
CatchDepth + 1
#if defined(ENABLE_EHTRACE)
, __ehtrace_level
#endif
};
__asm {
mov eax, FS:[0] // Fetch frame list head
mov CGRN.pNext, eax // Link this node in
lea eax, CGRN // Put this node at the head
mov FS:[0], eax
}
//
// Call the catch
//
void *continuationAddress = _CallSettingFrame( handlerAddress, pRN, NLGCode );
//
// Unlink our registration node
//
__asm {
mov eax, CGRN.pNext // Get parent node
mov FS:[0], eax // Put it at the head
}
EHTRACE_EXIT;
return continuationAddress;
}
void *CallCatchBlock(
EHExceptionRecord *pExcept,
EHRegistrationNode *pRN, // Dynamic info of function with catch
void *pContext, // ignored
DispatcherContext *pDC, // Context within subject frame
FuncInfo *pFuncInfo, // Static info of function with catch
void *handlerAddress, // Code address of handler
int CatchDepth, // How deeply nested in catch blocks are we?
unsigned int *pSp
)
{
FRAMEINFO frameinfo;
PFRAMEINFO pframeinfo;
EHExceptionRecord *pExceptTmp;
unsigned char *pRetAddr;
_CreateFrameInfo(&frameinfo, pDC, pContext);
frameinfo.pExitContext = (void *)GetSP();
if (pDC->pftinfo == _pftinfo)
{
// okay we are throw and catch in the same code fragment
_pftinfo->pFrameInfo = _pFrameInfoChain;
}
else
{
// we are not throw and catch in the same code fragment
// we need to chain the _pFrameInfoChain after the pDC->pftinof->pFrameInfo
// we should have got all the Frames saved so far, no matter how many code fragments we have been through
if (pDC->pftinfo->pFrameInfo != NULL)
{
// not chain if the case where CRT Is a DLL for everyone
if ( pDC->pftinfo->pFrameInfo != _pFrameInfoChain->pNext)
{
_pFrameInfoChain->pNext = (PFRAMEINFO)(pDC->pftinfo->pFrameInfo);
}
}
}
//call the handler
pRetAddr = (unsigned char *)_CallSettingFrame(handlerAddress, pRN);
*pSp = (unsigned int)GetR4();
//destructing the object
if (pExcept && (*(unsigned int *)pExcept != 0xffffffff))
{
DestructExceptionObject(pExcept, TRUE, pContext);
}
if (_pFrameInfoChain)
{
// don't forget to clear out the frame info the handler we are about
// to remove since most if not all off them are stack elements
_ASSERTE(_pFrameInfoChain->pftinfo != NULL);
_ASSERTE(_pFrameInfoChain->pftinfo->pFrameInfo != NULL);
pframeinfo = (PFRAMEINFO)_pFrameInfoChain->pftinfo->pFrameInfo;
if (pframeinfo)
_pFrameInfoChain->pftinfo->pFrameInfo = pframeinfo->pNext;
_pFrameInfoChain = _pFrameInfoChain->pNext; //remove current handler from the chain
cNested--;
_pftinfo->pFrameInfo = _pFrameInfoChain;
}
pframeinfo = _pFrameInfoChain;
pExceptTmp = pExcept;
while (pframeinfo && (pframeinfo->pSp <= (PPMSTACK)pRN))
{
// we should destruct any exception objects before this handler's frame
if ((EHExceptionRecord *)(pframeinfo->pExcept) != pExceptTmp)
{
// this is not a re-throw, do destroy
DestructExceptionObject((EHExceptionRecord *)pframeinfo->pExcept, TRUE, (void *)pframeinfo->dwRTOC);
pExceptTmp = (EHExceptionRecord *)(pframeinfo->pExcept);
*(unsigned int *)(pframeinfo->pExcept) = 0xffffffff;
pframeinfo->pExcept = NULL; //???
}
pframeinfo = pframeinfo->pNext;
_pFrameInfoChain = pframeinfo; //remove handler frame from the list
cNested--;
_pftinfo->pFrameInfo = _pFrameInfoChain;
}
return (void *)pRetAddr;
}
