src: fix Stop() terminating the next Environment on the isolate - #65819
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After `Stop(env)`, freeing the Environment and creating another one on the same isolate failed whenever no JavaScript ran in between: the new Environment's first script was terminated before it started. That is the normal case when `Stop()` is called from the process exit handler for an uncaught exception, or by an embedder while the loop is idle. `Stop()` calls `isolate->TerminateExecution()` unless `kDoNotTerminateIsolate` is set, and V8 only clears that request the next time JavaScript runs, so it outlived the Environment it was meant for. Cancel a pending termination when the Environment it was meant for is freed. `Worker::Run()` already did this by hand before freeing its Environment, with a TODO asking why V8 hit a DCHECK without it; this is why, and that call now happens in `FreeEnvironment()`. Refs: nodejs#33347 Signed-off-by: Shelley Vohr <shelley.vohr@gmail.com>
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #65819 +/- ##
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- Coverage 90.19% 90.18% -0.01%
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Files 770 770
Lines 264410 264410
Branches 50243 50238 -5
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- Hits 238490 238464 -26
- Misses 16924 16963 +39
+ Partials 8996 8983 -13
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After
Stop(env), freeing that Environment and creating a new one on the same isolate fails with the new Environment's first script terminated (LoadEnvironment()aborts) whenever no JavaScript ran in between, which is the normal case whenStop()is called from the process exit handler for an uncaught exception or on an idle Environment:Stop()requestsTerminateExecution()and V8 only clears that request the next time JavaScript runs, so it outlived the Environment it was aimed at.FreeEnvironment()now cancels a pending termination, which can only have been meant for the Environment being freed;Worker::Run()did this by hand with a TODO asking why it was needed, and that call moves intoFreeEnvironment().Tests:
EnvironmentTest.StopFromExitHandlerDoesNotLeakIntoNextEnvironment(aborted before); the worker termination tests pass.Refs: #33347
Disclosure: the code, test and this description were written by Claude Code, directed and reviewed by @codebytere.