jit::RematerializedFrame *
jit::JitActivation::getRematerializedFrame(JSContext *cx, const JitFrameIterator &iter, size_t inlineDepth)
{
// Only allow rematerializing from the same thread.
MOZ_ASSERT(cx->perThreadData == cx_->perThreadData);
MOZ_ASSERT(iter.activation() == this);
MOZ_ASSERT(iter.isIonScripted());
if (!rematerializedFrames_) {
rematerializedFrames_ = cx->new_<RematerializedFrameTable>(cx);
if (!rematerializedFrames_ || !rematerializedFrames_->init()) {
rematerializedFrames_ = nullptr;
return nullptr;
}
}
uint8_t *top = iter.fp();
RematerializedFrameTable::AddPtr p = rematerializedFrames_->lookupForAdd(top);
if (!p) {
RematerializedFrameVector empty(cx);
if (!rematerializedFrames_->add(p, top, Move(empty)))
return nullptr;
// The unit of rematerialization is an uninlined frame and its inlined
// frames. Since inlined frames do not exist outside of snapshots, it
// is impossible to synchronize their rematerialized copies to
// preserve identity. Therefore, we always rematerialize an uninlined
// frame and all its inlined frames at once.
InlineFrameIterator inlineIter(cx, &iter);
if (!RematerializedFrame::RematerializeInlineFrames(cx, top, inlineIter, p->value()))
return nullptr;
}
return p->value()[inlineDepth];
}
jit::RematerializedFrame *
jit::JitActivation::getRematerializedFrame(ThreadSafeContext *cx, JitFrameIterator &iter,
size_t inlineDepth)
{
// Only allow rematerializing from the same thread.
MOZ_ASSERT(cx->perThreadData == cx_->perThreadData);
MOZ_ASSERT(iter.activation() == this);
MOZ_ASSERT(iter.isIonJS());
if (!rematerializedFrames_) {
rematerializedFrames_ = cx->new_<RematerializedFrameTable>(cx);
if (!rematerializedFrames_ || !rematerializedFrames_->init()) {
rematerializedFrames_ = nullptr;
return nullptr;
}
}
// The unit of rematerialization is an uninlined frame and its inlined
// frames. Since inlined frames do not exist outside of snapshots, it is
// impossible to synchronize their rematerialized copies to preserve
// identity. Therefore, we always rematerialize an uninlined frame and all
// its inlined frames at once.
uint8_t *top = iter.fp();
RematerializedFrameTable::AddPtr p = rematerializedFrames_->lookupForAdd(top);
if (!p) {
RematerializedFrameVector empty(cx);
if (!rematerializedFrames_->add(p, top, Move(empty)))
return nullptr;
InlineFrameIterator inlineIter(cx, &iter);
if (!p->value().resize(inlineIter.frameCount()))
return nullptr;
while (true) {
size_t frameNo = inlineIter.frameNo();
p->value()[frameNo] = RematerializedFrame::New(cx, top, inlineIter);
if (!p->value()[frameNo])
return nullptr;
if (!inlineIter.more())
break;
++inlineIter;
}
}
return p->value()[inlineDepth];
}