PrettyStackTraceEntry::PrettyStackTraceEntry() {
// The first time this is called, we register the crash printer.
static bool HandlerRegistered = RegisterCrashPrinter();
(void)HandlerRegistered;
// Link ourselves.
NextEntry = PrettyStackTraceHead.get();
PrettyStackTraceHead.set(this);
}
void CrashRecoveryContext::Enable() {
sys::ScopedLock L(*gCrashRecoveryContextMutex);
if (gCrashRecoveryEnabled)
return;
gCrashRecoveryEnabled = true;
// We can set up vectored exception handling now. We will install our
// handler as the front of the list, though there's no assurances that
// it will remain at the front (another call could install itself before
// our handler). This 1) isn't likely, and 2) shouldn't cause problems.
PVOID handle = ::AddVectoredExceptionHandler(1, ExceptionHandler);
sCurrentExceptionHandle.set(handle);
}
CrashRecoveryContext::~CrashRecoveryContext() {
// Reclaim registered resources.
CrashRecoveryContextCleanup *i = head;
tlIsRecoveringFromCrash.set(head);
while (i) {
CrashRecoveryContextCleanup *tmp = i;
i = tmp->next;
tmp->cleanupFired = true;
tmp->recoverResources();
delete tmp;
}
tlIsRecoveringFromCrash.erase();
CrashRecoveryContextImpl *CRCI = (CrashRecoveryContextImpl *) Impl;
delete CRCI;
}
void CrashRecoveryContext::Disable() {
sys::ScopedLock L(*gCrashRecoveryContextMutex);
if (!gCrashRecoveryEnabled)
return;
gCrashRecoveryEnabled = false;
PVOID currentHandle = const_cast<PVOID>(sCurrentExceptionHandle.get());
if (currentHandle) {
// Now we can remove the vectored exception handler from the chain
::RemoveVectoredExceptionHandler(currentHandle);
// Reset the handle in our thread-local set.
sCurrentExceptionHandle.set(NULL);
}
}
PrettyStackTraceEntry::~PrettyStackTraceEntry() {
assert(PrettyStackTraceHead.get() == this &&
"Pretty stack trace entry destruction is out of order");
PrettyStackTraceHead.set(getNextEntry());
}