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Silently release internal stream readers

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Basilisk-Dev 2026-05-08 19:40:00 -04:00 • committed by wuggy
commit 29056ef112
1 changed files with 56 additions and 2 deletions
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58
js/src/builtin/Stream.cpp
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@ -5869,6 +5869,46 @@ StreamCompressionProcess(JSContext* cx, unsigned argc, Value* vp)
return true;
}
bool
ReleaseReadableStreamReaderSilently(JSContext* cx, unsigned argc, Value* vp)
{
CallArgs args = CallArgsFromVp(argc, vp);
args.rval().setBoolean(true);
if (!args.get(0).isObject())
return true;
RootedObject readerObj(cx, &args[0].toObject());
if (!readerObj->is<ReadableStreamDefaultReader>() &&
!readerObj->is<ReadableStreamBYOBReader>())
return true;
RootedNativeObject reader(cx, &readerObj->as<NativeObject>());
if (!ReaderHasStream(reader))
return true;
Value requestsVal = reader->getFixedSlot(ReaderSlot_Requests);
if (!requestsVal.isUndefined()) {
NativeObject* requests = &requestsVal.toObject().as<NativeObject>();
if (requests->getDenseInitializedLength() != 0) {
args.rval().setBoolean(false);
return true;
}
}
Rooted<ReadableStream*> stream(cx, StreamFromReader(reader));
MOZ_ASSERT(&stream->getFixedSlot(StreamSlot_Reader).toObject() == reader);
RootedObject closedPromise(cx, PromiseObject::unforgeableResolve(cx, UndefinedHandleValue));
if (!closedPromise)
return false;
reader->setFixedSlot(ReaderSlot_ClosedPromise, ObjectValue(*closedPromise));
stream->setFixedSlot(StreamSlot_Reader, UndefinedValue());
reader->setFixedSlot(ReaderSlot_Stream, UndefinedValue());
return true;
}
} // anonymous namespace
bool
@ -5882,6 +5922,10 @@ js::InitStreamExtras(JSContext* cx, HandleObject global)
StreamCompressionProcess, 3, 0))
return false;
if (!JS_DefineFunction(cx, global, "__uxpReleaseReadableStreamReaderSilently",
ReleaseReadableStreamReaderSilently, 1, 0))
return false;
static const char source[] = R"JS(
(function(global) {
"use strict";
@ -5973,8 +6017,18 @@ js::InitStreamExtras(JSContext* cx, HandleObject global)
}
function releaseReaderLock(reader) {
try { silenceRejection(reader.closed); } catch (e) {}
try { reader.releaseLock(); } catch (e) {}
try {
if (global.__uxpReleaseReadableStreamReaderSilently(reader))
return;
} catch (e) {}
Promise.resolve().then(function() {
try {
if (global.__uxpReleaseReadableStreamReaderSilently(reader))
return;
} catch (e) {}
try { silenceRejection(reader.closed); } catch (e) {}
try { reader.releaseLock(); } catch (e) {}
});
}
function releaseWriterLock(writer) {