Implement runJobs() for the SpiderMonkey Debugger API #597
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This was referenced Jul 25, 2025
jdm
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Jul 27, 2025
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Co-authored-by: atbrakhi <[email protected]> Signed-off-by: Delan Azabani <[email protected]>
Co-authored-by: atbrakhi <[email protected]> Signed-off-by: Delan Azabani <[email protected]>
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Jul 31, 2025
in the [SpiderMonkey Debugger API](https://firefox-source-docs.mozilla.org/js/Debugger/), hooks like [onNewGlobalObject()](https://firefox-source-docs.mozilla.org/js/Debugger/Debugger.html#onnewglobalobject-global) use an AutoDebuggerJobQueueInterruption to [switch to a new microtask queue](https://github.com/servo/mozjs/blob/b14aebff23ac4d5b0652060ef949334bda08b22f/mozjs-sys/mozjs/js/src/debugger/Debugger.cpp#L2834-L2841) and avoid clobbering the debuggee’s microtask queue. this in turn relies on JobQueue::runJobs(), which is [not yet implemented in RustJobQueue](https://github.com/servo/mozjs/blob/b14aebff23ac4d5b0652060ef949334bda08b22f/mozjs-sys/src/jsglue.cpp#L76-L78). this patch bumps mozjs to servo/mozjs#597, which implements [runJobs()](https://github.com/servo/mozjs/blob/b14aebff23ac4d5b0652060ef949334bda08b22f/mozjs-sys/mozjs/js/public/Promise.h#L61-L76) for RustJobQueue by calling into Servo’s MicrotaskQueue::checkpoint() via a new function in JobQueueTraps. SpiderMonkey [does not own external job queues](https://github.com/servo/mozjs/blob/b14aebff23ac4d5b0652060ef949334bda08b22f/mozjs-sys/mozjs/js/public/Promise.h#L117-L123), so the lifetime of these queues is managed in Servo, where they are stored in a Vec-based stack. stack-like behaviour is adequate for SpiderMonkey’s save and restore patterns, as far as we can tell, but we’ve added an assertion just in case. Testing: manually tested working in devtools debugger patch (#37667), where it will undergo automated tests Signed-off-by: Delan Azabani <[email protected]> Co-authored-by: atbrakhi <[email protected]>
minghuaw
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Aug 1, 2025
in the [SpiderMonkey Debugger API](https://firefox-source-docs.mozilla.org/js/Debugger/), hooks like [onNewGlobalObject()](https://firefox-source-docs.mozilla.org/js/Debugger/Debugger.html#onnewglobalobject-global) use an AutoDebuggerJobQueueInterruption to [switch to a new microtask queue](https://github.com/servo/mozjs/blob/b14aebff23ac4d5b0652060ef949334bda08b22f/mozjs-sys/mozjs/js/src/debugger/Debugger.cpp#L2834-L2841) and avoid clobbering the debuggee’s microtask queue. this in turn relies on JobQueue::runJobs(), which is [not yet implemented in RustJobQueue](https://github.com/servo/mozjs/blob/b14aebff23ac4d5b0652060ef949334bda08b22f/mozjs-sys/src/jsglue.cpp#L76-L78). this patch bumps mozjs to servo/mozjs#597, which implements [runJobs()](https://github.com/servo/mozjs/blob/b14aebff23ac4d5b0652060ef949334bda08b22f/mozjs-sys/mozjs/js/public/Promise.h#L61-L76) for RustJobQueue by calling into Servo’s MicrotaskQueue::checkpoint() via a new function in JobQueueTraps. SpiderMonkey [does not own external job queues](https://github.com/servo/mozjs/blob/b14aebff23ac4d5b0652060ef949334bda08b22f/mozjs-sys/mozjs/js/public/Promise.h#L117-L123), so the lifetime of these queues is managed in Servo, where they are stored in a Vec-based stack. stack-like behaviour is adequate for SpiderMonkey’s save and restore patterns, as far as we can tell, but we’ve added an assertion just in case. Testing: manually tested working in devtools debugger patch (servo#37667), where it will undergo automated tests Signed-off-by: Delan Azabani <[email protected]> Co-authored-by: atbrakhi <[email protected]>
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in the SpiderMonkey Debugger API, hooks like onNewGlobalObject() use an AutoDebuggerJobQueueInterruption to switch to a new microtask queue and avoid clobbering the debuggee’s microtask queue. this in turn relies on JobQueue::runJobs(), which is not yet implemented in RustJobQueue.
this patch implements runJobs() for RustJobQueue by calling into Servo’s MicrotaskQueue::checkpoint() via a new function in JobQueueTraps.
SpiderMonkey does not own any job queues, so the lifetime of these queues is managed in Servo, where they are stored in a Vec-based stack. stack-like behaviour is adequate for SpiderMonkey’s save and restore patterns, as far as we can tell, but we’ve added an assertion just in case.
Servo patch: servo/servo#38265