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lib: avoid mutating Error.stackTraceLimit when it is not writable #38215

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merged 1 commit into from
Apr 14, 2021
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lib: avoid mutating Error.stackTraceLimit when it is not writable #38215

merged 1 commit into from
Apr 14, 2021
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aduh95
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@aduh95 aduh95 commented Apr 12, 2021

This PR aims to avoid getting Cannot assign to read only property 'stackTraceLimit' of function 'function Error() { [native code] }' errors thrown from core when Node.js is executed with the --frozen-intrinsics flag.

@nodejs-github-bot nodejs-github-bot added lib / src Issues and PRs related to general changes in the lib or src directory. needs-ci PRs that need a full CI run. labels Apr 12, 2021
@aduh95 aduh95 mentioned this pull request Apr 12, 2021
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CI: https://ci.nodejs.org/job/node-test-pull-request/37405/

mscdex
mscdex reviewed Apr 12, 2021
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Realized this should be checking configurable, not frozen status to handle if someone does an Object.seal(Error), etc.

@aduh95 aduh95 removed the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Apr 12, 2021
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aduh95 commented Apr 13, 2021 •
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Benchmark CI: https://ci.nodejs.org/view/Node.js%20benchmark/job/benchmark-node-micro-benchmarks/998/

Results look OK-ish:

                                                               confidence improvement accuracy (*)    (**)   (***)
misc/hidestackframes.js n=100000 type='direct-call-noerr'                      0.02 %       ±5.94%  ±7.91% ±10.30%
misc/hidestackframes.js n=100000 type='direct-call-throw'               *     -2.86 %       ±2.36%  ±3.14%  ±4.09%
misc/hidestackframes.js n=100000 type='hide-stackframes-noerr'                 0.34 %      ±15.71% ±20.91% ±27.25%
misc/hidestackframes.js n=100000 type='hide-stackframes-throw'                -2.86 %       ±3.23%  ±4.30%  ±5.60%

@aduh95 aduh95 changed the title lib: avoid mutating Error.stackTraceLimit when Error is frozen lib: avoid mutating Error.stackTraceLimit when it is not writable Apr 13, 2021
@aduh95 aduh95 requested a review from bmeck April 13, 2021 10:44
aduh95
aduh95 commented Apr 13, 2021
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lib/internal/errors.js Outdated
return ObjectIsExtensible(Error);
}

return desc.writable ?? typeof desc.set === 'function';
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We could try to cache the value when the property is not configurable:

Suggested change
return desc.writable ?? typeof desc.set === 'function';
const returnValue = desc.writable ?? typeof desc.set === 'function';
if (desc.configurable === false)
module.exports.isErrorStackTraceLimitWritable = () => returnValue;
return returnValue;

I think it makes the harder to read, and I think we should try to optimize for the most common case (which is when the property has configurable and writable set to true).

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I'm fine not cacheing for now

bmeck
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CI: https://ci.nodejs.org/job/node-test-pull-request/37440/

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aduh95 commented Apr 13, 2021 •
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Benchmark CI: https://ci.nodejs.org/view/Node.js%20benchmark/job/benchmark-node-micro-benchmarks/999/

EDIT: the results are not as good… I'd say the tradeoff is worth it, I'm open to suggestions to improve those figures.

                                                               confidence improvement accuracy (*)    (**)   (***)
misc/hidestackframes.js n=100000 type='direct-call-noerr'                      2.68 %       ±4.40%  ±5.86%  ±7.62%
misc/hidestackframes.js n=100000 type='direct-call-throw'              **     -4.20 %       ±3.04%  ±4.05%  ±5.29%
misc/hidestackframes.js n=100000 type='hide-stackframes-noerr'                13.07 %      ±14.03% ±18.86% ±24.95%
misc/hidestackframes.js n=100000 type='hide-stackframes-throw'        ***     -4.70 %       ±2.42%  ±3.22%  ±4.19%

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aduh95 commented Apr 14, 2021

I've added more tests. I think this is ready to land but I'd love to get a final approval to make sure I haven't forgotten anything :)

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LGTM

@aduh95 aduh95 added the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Apr 14, 2021
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lib: avoid mutating Error.stackTraceLimit when it is not writable
09c9e5d 
PR-URL: nodejs#38215
Reviewed-By: Bradley Farias <bradley.meck@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
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aduh95 commented Apr 14, 2021

Landed in 09c9e5d

@aduh95 aduh95 merged commit 09c9e5d into nodejs:master Apr 14, 2021
@aduh95 aduh95 deleted the frozen-error branch April 14, 2021 22:18
BethGriggs pushed a commit that referenced this pull request Apr 15, 2021
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lib: avoid mutating Error.stackTraceLimit when it is not writable
dfdf348 
PR-URL: #38215
Reviewed-By: Bradley Farias <bradley.meck@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
@BethGriggs BethGriggs mentioned this pull request Apr 16, 2021
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@liuxingbaoyu liuxingbaoyu mentioned this pull request May 13, 2023
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