uint32_t
jit::ExceptionHandlerBailout(JSContext* cx, const InlineFrameIterator& frame,
ResumeFromException* rfe,
const ExceptionBailoutInfo& excInfo,
bool* overrecursed)
{
// We can be propagating debug mode exceptions without there being an
// actual exception pending. For instance, when we return false from an
// operation callback like a timeout handler.
MOZ_ASSERT_IF(!excInfo.propagatingIonExceptionForDebugMode(), cx->isExceptionPending());
cx->runtime()->jitTop = FAKE_JIT_TOP_FOR_BAILOUT;
gc::AutoSuppressGC suppress(cx);
JitActivationIterator jitActivations(cx->runtime());
BailoutFrameInfo bailoutData(jitActivations, frame.frame());
JitFrameIterator iter(jitActivations);
CommonFrameLayout* currentFramePtr = iter.current();
BaselineBailoutInfo* bailoutInfo = nullptr;
uint32_t retval = BailoutIonToBaseline(cx, bailoutData.activation(), iter, true,
&bailoutInfo, &excInfo);
if (retval == BAILOUT_RETURN_OK) {
MOZ_ASSERT(bailoutInfo);
// Overwrite the kind so HandleException after the bailout returns
// false, jumping directly to the exception tail.
if (excInfo.propagatingIonExceptionForDebugMode())
bailoutInfo->bailoutKind = Bailout_IonExceptionDebugMode;
rfe->kind = ResumeFromException::RESUME_BAILOUT;
rfe->target = cx->runtime()->jitRuntime()->getBailoutTail()->raw();
rfe->bailoutInfo = bailoutInfo;
} else {
// Bailout failed. If there was a fatal error, clear the
// exception to turn this into an uncatchable error. If the
// overrecursion check failed, continue popping all inline
// frames and have the caller report an overrecursion error.
MOZ_ASSERT(!bailoutInfo);
if (!excInfo.propagatingIonExceptionForDebugMode())
cx->clearPendingException();
if (retval == BAILOUT_RETURN_OVERRECURSED)
*overrecursed = true;
else
MOZ_ASSERT(retval == BAILOUT_RETURN_FATAL_ERROR);
}
// Make the frame being bailed out the top profiled frame.
if (cx->runtime()->jitRuntime()->isProfilerInstrumentationEnabled(cx->runtime()))
cx->runtime()->jitActivation->setLastProfilingFrame(currentFramePtr);
return retval;
}
uint32_t
jit::ExceptionHandlerBailout(JSContext *cx, const InlineFrameIterator &frame,
ResumeFromException *rfe,
const ExceptionBailoutInfo &excInfo,
bool *overrecursed)
{
// We can be propagating debug mode exceptions without there being an
// actual exception pending. For instance, when we return false from an
// operation callback like a timeout handler.
MOZ_ASSERT_IF(!excInfo.propagatingIonExceptionForDebugMode(), cx->isExceptionPending());
cx->mainThread().ionTop = nullptr;
JitActivationIterator jitActivations(cx->runtime());
IonBailoutIterator iter(jitActivations, frame.frame());
JitActivation *activation = jitActivations.activation()->asJit();
BaselineBailoutInfo *bailoutInfo = nullptr;
uint32_t retval = BailoutIonToBaseline(cx, activation, iter, true, &bailoutInfo, &excInfo);
if (retval == BAILOUT_RETURN_OK) {
MOZ_ASSERT(bailoutInfo);
// Overwrite the kind so HandleException after the bailout returns
// false, jumping directly to the exception tail.
if (excInfo.propagatingIonExceptionForDebugMode())
bailoutInfo->bailoutKind = Bailout_IonExceptionDebugMode;
rfe->kind = ResumeFromException::RESUME_BAILOUT;
rfe->target = cx->runtime()->jitRuntime()->getBailoutTail()->raw();
rfe->bailoutInfo = bailoutInfo;
} else {
// Bailout failed. If there was a fatal error, clear the
// exception to turn this into an uncatchable error. If the
// overrecursion check failed, continue popping all inline
// frames and have the caller report an overrecursion error.
MOZ_ASSERT(!bailoutInfo);
if (!excInfo.propagatingIonExceptionForDebugMode())
cx->clearPendingException();
if (retval == BAILOUT_RETURN_OVERRECURSED)
*overrecursed = true;
else
MOZ_ASSERT(retval == BAILOUT_RETURN_FATAL_ERROR);
}
return retval;
}
uint32_t
jit::ExceptionHandlerBailout(JSContext* cx, const InlineFrameIterator& frame,
ResumeFromException* rfe,
const ExceptionBailoutInfo& excInfo,
bool* overrecursed)
{
// We can be propagating debug mode exceptions without there being an
// actual exception pending. For instance, when we return false from an
// operation callback like a timeout handler.
MOZ_ASSERT_IF(!excInfo.propagatingIonExceptionForDebugMode(), cx->isExceptionPending());
JitActivation* act = cx->activation()->asJit();
uint8_t* prevExitFP = act->exitFP();
auto restoreExitFP = mozilla::MakeScopeExit([&]() { act->setExitFP(prevExitFP); });
act->setExitFP(FAKE_EXITFP_FOR_BAILOUT);
gc::AutoSuppressGC suppress(cx);
JitActivationIterator jitActivations(cx);
BailoutFrameInfo bailoutData(jitActivations, frame.frame());
JitFrameIterator iter(jitActivations);
CommonFrameLayout* currentFramePtr = iter.current();
BaselineBailoutInfo* bailoutInfo = nullptr;
uint32_t retval;
{
// Currently we do not tolerate OOM here so as not to complicate the
// exception handling code further.
AutoEnterOOMUnsafeRegion oomUnsafe;
retval = BailoutIonToBaseline(cx, bailoutData.activation(), iter, true,
&bailoutInfo, &excInfo);
if (retval == BAILOUT_RETURN_FATAL_ERROR && cx->isThrowingOutOfMemory())
oomUnsafe.crash("ExceptionHandlerBailout");
}
if (retval == BAILOUT_RETURN_OK) {
MOZ_ASSERT(bailoutInfo);
// Overwrite the kind so HandleException after the bailout returns
// false, jumping directly to the exception tail.
if (excInfo.propagatingIonExceptionForDebugMode())
bailoutInfo->bailoutKind = Bailout_IonExceptionDebugMode;
rfe->kind = ResumeFromException::RESUME_BAILOUT;
rfe->target = cx->runtime()->jitRuntime()->getBailoutTail()->raw();
rfe->bailoutInfo = bailoutInfo;
} else {
// Bailout failed. If the overrecursion check failed, clear the
// exception to turn this into an uncatchable error, continue popping
// all inline frames and have the caller report the error.
MOZ_ASSERT(!bailoutInfo);
if (retval == BAILOUT_RETURN_OVERRECURSED) {
*overrecursed = true;
if (!excInfo.propagatingIonExceptionForDebugMode())
cx->clearPendingException();
} else {
MOZ_ASSERT(retval == BAILOUT_RETURN_FATAL_ERROR);
// Crash for now so as not to complicate the exception handling code
// further.
MOZ_CRASH();
}
}
// Make the frame being bailed out the top profiled frame.
if (cx->runtime()->jitRuntime()->isProfilerInstrumentationEnabled(cx->runtime()))
cx->jitActivation->setLastProfilingFrame(currentFramePtr);
return retval;
}
