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Issue #1691 - Part 6d: Optimize handling of internally-created Promise objects. https://bugzilla.mozilla.org/show_bug.cgi?id=1358879 The patch uses a different test: PROMISE_FLAG_DEFAULT_REJECT_FUNCTION which doesn't exist in our codebase. It was added in this bug, which appears to be partly complete: https://bugzilla.mozilla.org/show_bug.cgi?id=1313049

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(cherry picked from commit 97fc74b693813eaaa9ab833d9c51fc5868ff039f)
This commit is contained in:
Brian Smith 2023-04-11 16:42:04 -05:00 • committed by roytam1
commit c3daecc218
4 changed files with 19 additions and 27 deletions
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9
js/src/builtin/Promise.cpp
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@ -2478,8 +2478,11 @@ RunResolutionFunction(JSContext *cx, HandleObject resolutionFun, HandleValue res
{
// The absence of a resolve/reject function can mean that, as an
// optimization, those weren't created. In that case, a flag is set on
// the Promise object. There are also reactions where the Promise
// itself is missing. For those, there's nothing left to do here.
// the Promise object. (It's also possible to not have a resolution
// function without that flag being set. This can occur if a Promise
// subclass constructor passes null/undefined to `super()`.)
// There are also reactions where the Promise itself is missing. For
// those, there's nothing left to do here.
assertSameCompartment(cx, resolutionFun);
assertSameCompartment(cx, result);
assertSameCompartment(cx, promiseObj);
@ -4826,7 +4829,7 @@ PromiseObject::reject(JSContext* cx, Handle<PromiseObject*> promise, HandleValue
return true;
if (PromiseHasAnyFlag(*promise, PROMISE_FLAG_DEFAULT_RESOLVING_FUNCTIONS))
return RejectMaybeWrappedPromise(cx, promise, rejectionValue);
return ResolvePromise(cx, promise, rejectionValue, JS::PromiseState::Rejected);
RootedValue funVal(cx, promise->getFixedSlot(PromiseSlot_RejectFunction));
MOZ_ASSERT(IsCallable(funVal));