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Remove recover instruction results after bailouts.

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This commit is contained in:
wolfbeast 2018-07-13 06:11:55 +02:00 • committed by Roy Tam
commit 2a6262ee6d
2 changed files with 20 additions and 38 deletions
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56
js/src/jit/BaselineBailouts.cpp
View file

@ -419,41 +419,6 @@ struct BaselineStackBuilder
}
};
// Ensure that all value locations are readable from the SnapshotIterator.
// Remove RInstructionResults from the JitActivation if the frame got recovered
// ahead of the bailout.
class SnapshotIteratorForBailout : public SnapshotIterator
{
JitActivation* activation_;
JitFrameIterator& iter_;
public:
SnapshotIteratorForBailout(JitActivation* activation, JitFrameIterator& iter)
: SnapshotIterator(iter, activation->bailoutData()->machineState()),
activation_(activation),
iter_(iter)
{
MOZ_ASSERT(iter.isBailoutJS());
}
~SnapshotIteratorForBailout() {
// The bailout is complete, we no longer need the recover instruction
// results.
activation_->removeIonFrameRecovery(fp_);
}
// Take previously computed result out of the activation, or compute the
// results of all recover instructions contained in the snapshot.
MOZ_MUST_USE bool init(JSContext* cx) {
// Under a bailout, there is no need to invalidate the frame after
// evaluating the recover instruction, as the invalidation is only
// needed to cause of the frame which has been introspected.
MaybeReadFallback recoverBailout(cx, activation_, &iter_, MaybeReadFallback::Fallback_DoNothing);
return initInstructionResults(recoverBailout);
}
};
#ifdef DEBUG
static inline bool
IsInlinableFallback(ICFallbackStub* icEntry)
@ -1476,6 +1441,7 @@ jit::BailoutIonToBaseline(JSContext* cx, JitActivation* activation, JitFrameIter
{
MOZ_ASSERT(bailoutInfo != nullptr);
MOZ_ASSERT(*bailoutInfo == nullptr);
MOZ_ASSERT(iter.isBailoutJS());
TraceLoggerThread* logger = TraceLoggerForMainThread(cx->runtime());
TraceLogStopEvent(logger, TraceLogger_IonMonkey);
@ -1488,6 +1454,12 @@ jit::BailoutIonToBaseline(JSContext* cx, JitActivation* activation, JitFrameIter
activation->removeRematerializedFramesFromDebugger(cx, iter.fp());
});
// Always remove the RInstructionResults from the JitActivation, even in
// case of failures as the stack frame is going away after the bailout.
auto removeIonFrameRecovery = mozilla::MakeScopeExit([&] {
activation->removeIonFrameRecovery(iter.jsFrame());
});
// The caller of the top frame must be one of the following:
// IonJS - Ion calling into Ion.
// BaselineStub - Baseline calling into Ion.
@ -1561,9 +1533,19 @@ jit::BailoutIonToBaseline(JSContext* cx, JitActivation* activation, JitFrameIter
}
JitSpew(JitSpew_BaselineBailouts, " Incoming frame ptr = %p", builder.startFrame());
SnapshotIteratorForBailout snapIter(activation, iter);
if (!snapIter.init(cx))
// Under a bailout, there is no need to invalidate the frame after
// evaluating the recover instruction, as the invalidation is only needed in
// cases where the frame is introspected ahead of the bailout.
MaybeReadFallback recoverBailout(cx, activation, &iter, MaybeReadFallback::Fallback_DoNothing);
// Ensure that all value locations are readable from the SnapshotIterator.
// Get the RInstructionResults from the JitActivation if the frame got
// recovered ahead of the bailout.
SnapshotIterator snapIter(iter, activation->bailoutData()->machineState());
if (!snapIter.initInstructionResults(recoverBailout)) {
ReportOutOfMemory(cx);
return BAILOUT_RETURN_FATAL_ERROR;
}
#ifdef TRACK_SNAPSHOTS
snapIter.spewBailingFrom();

2
js/src/jit/JitFrameIterator.h
View file

@ -509,13 +509,13 @@ class SnapshotIterator
return recover_.moreInstructions();
}
protected:
// Register a vector used for storing the results of the evaluation of
// recover instructions. This vector should be registered before the
// beginning of the iteration. This function is in charge of allocating
// enough space for all instructions results, and return false iff it fails.
MOZ_MUST_USE bool initInstructionResults(MaybeReadFallback& fallback);
protected:
// This function is used internally for computing the result of the recover
// instructions.
MOZ_MUST_USE bool computeInstructionResults(JSContext* cx, RInstructionResults* results) const;