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inspector: patch C++ debug options instead of process._breakFirstLine #26602

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inspector: patch C++ debug options instead of process._breakFirstLine #26602

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joyeecheung
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Instead of patching process._breakFirstLine to inform the JS land
to wait for the debugger, check that the JS land has not yet
serialized the options and then patch the debug options from C++.
The changes will be carried into JS later during option serialization.

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  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • commit message follows commit guidelines

@joyeecheung
inspector: patch C++ debug options instead of process._breakFirstLine
ed6b456 
Instead of patching process._breakFirstLine to inform the JS land
to wait for the debugger, check that the JS land has not yet
serialized the options and then patch the debug options from C++.
The changes will be carried into JS later during option serialization.
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@joyeecheung build started: https://ci.nodejs.org/blue/organizations/jenkins/node-test-pull-request-lite-pipeline/detail/node-test-pull-request-lite-pipeline/2875/pipeline

@nodejs-github-bot nodejs-github-bot added c++ Issues and PRs that require attention from people who are familiar with C++. lib / src Issues and PRs related to general changes in the lib or src directory. labels Mar 12, 2019
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CI: https://ci.nodejs.org/job/node-test-pull-request/21444/

@addaleax
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This seems like something that should be handled during options parsing, tbh, unless there’s any reason not to do that?

I’m not really a fan of adding the has_serialized_options() state here…

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joyeecheung commented Mar 12, 2019 •
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@addaleax The states here are determined when the NodeWorker.enable message is dispatched on the main thread with waitForDebuggerOnStart = true, and not through option parsing, I don't think there is a way to handle this in the parser? We can only determine this value when we start the inspector agent of the worker by querying the parent, it's not ideal that we have to update the option values like this, but I guess it's at least better than updating process._breakFirstLine in the worker...for one, that result in inconsistent states, since the source of truth is in the C++ options, but only process._breakFirstLine is updated, so we even get getOptionValue('--inspect-brk') !== process._breakFirstLine in the JS land of the worker.

has_serialized_options here is a safety net to check that we don't run into weird races - that is, the child worker's inspector agent should not be started after or during pre-execution of the worker (that's probably impossible at the moment, since StartWorkerInspector is invoked before RunBootstrapping, so it's just guarding against future bugs).

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hmm..I guess we could also normalize the child's debug options in Worker::New by querying the state of env->inspector_agent() eagerly at that point, not sure if that pass the test yet..

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joyeecheung commented Mar 12, 2019 •
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Well, looks like we can't patch the options in Worker::New after all, because if the main thread dispatch a NodeWorker.disable in a bad time and we patch the options too early, there would be a race and fail the test...

jdalton
jdalton reviewed Mar 12, 2019
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has_serialized_options here is a safety net to check that we don't run into weird races - that is, the child worker's inspector agent should not be started after or during pre-execution of the worker (that's probably impossible at the moment, since StartWorkerInspector is invoked before RunBootstrapping, so it's just guarding against future bugs).

@joyeecheung Can we rather check that then? That the inspector agent is not started during/after pre-execution? I’d like to be able to call getOptions() multiple times in the future…

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joyeecheung commented Mar 12, 2019 •
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@addaleax I could remove the check in GetOptions to allow multiple serializations, Agent::Start just needs to make sure that GetOptions has not been called before, it does not really matter how many times it is called afterwards.

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Removed the check in GetOptions to allow multiple serializations.

CI: https://ci.nodejs.org/job/node-test-pull-request/21467/

@BridgeAR BridgeAR added the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Mar 18, 2019
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New CI: https://ci.nodejs.org/job/node-test-pull-request/21636/

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Resume: https://ci.nodejs.org/job/node-test-pull-request/21642/

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Landed in 97a919b

joyeecheung added a commit that referenced this pull request Mar 18, 2019
@joyeecheung
inspector: patch C++ debug options instead of process._breakFirstLine
97a919b 
Instead of patching process._breakFirstLine to inform the JS land
to wait for the debugger, check that the JS land has not yet
serialized the options and then patch the debug options from C++.
The changes will be carried into JS later during option serialization.

PR-URL: #26602
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Eugene Ostroukhov <eostroukhov@google.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
@joyeecheung joyeecheung mentioned this pull request Mar 22, 2019
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targos pushed a commit that referenced this pull request Mar 28, 2019
@joyeecheung @targos
inspector: patch C++ debug options instead of process._breakFirstLine
423f363 
Instead of patching process._breakFirstLine to inform the JS land
to wait for the debugger, check that the JS land has not yet
serialized the options and then patch the debug options from C++.
The changes will be carried into JS later during option serialization.

PR-URL: #26602
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Eugene Ostroukhov <eostroukhov@google.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
targos pushed a commit that referenced this pull request Mar 30, 2019
@joyeecheung @targos
inspector: patch C++ debug options instead of process._breakFirstLine
1b45704 
Instead of patching process._breakFirstLine to inform the JS land
to wait for the debugger, check that the JS land has not yet
serialized the options and then patch the debug options from C++.
The changes will be carried into JS later during option serialization.

PR-URL: #26602
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Eugene Ostroukhov <eostroukhov@google.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
@BethGriggs BethGriggs mentioned this pull request Apr 9, 2019
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@eugeneo eugeneo eugeneo approved these changes

@addaleax addaleax addaleax approved these changes

@BridgeAR BridgeAR BridgeAR approved these changes

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