void
LiveSavedFrameCache::find(JSContext* cx, FrameIter& frameIter, MutableHandleSavedFrame frame) const
{
MOZ_ASSERT(initialized());
MOZ_ASSERT(!frameIter.done());
MOZ_ASSERT(frameIter.hasCachedSavedFrame());
Maybe<FramePtr> maybeFramePtr = getFramePtr(frameIter);
MOZ_ASSERT(maybeFramePtr.isSome());
FramePtr framePtr(*maybeFramePtr);
jsbytecode* pc = frameIter.pc();
size_t numberStillValid = 0;
frame.set(nullptr);
for (auto* p = frames->begin(); p < frames->end(); p++) {
numberStillValid++;
if (framePtr == p->framePtr && pc == p->pc) {
frame.set(p->savedFrame);
break;
}
}
if (!frame) {
frames->clear();
return;
}
MOZ_ASSERT(0 < numberStillValid && numberStillValid <= frames->length());
if (frame->compartment() != cx->compartment()) {
frame.set(nullptr);
numberStillValid--;
}
// Everything after the cached SavedFrame are stale younger frames we have
// since popped.
frames->shrinkBy(frames->length() - numberStillValid);
}
