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src: handle empty Maybe(Local) in node_util.cc#33867

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src: handle empty Maybe(Local) in node_util.cc#33867
addaleax wants to merge 3 commits intonodejs:masterfrom
addaleax:util-binding-maybe

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@addaleax addaleax commented Jun 13, 2020 •
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Refs: https://github.com/nodejs/node/blob/master/src/README.md#checked-conversion

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

@nodejs-github-bot nodejs-github-bot added c++ Issues and PRs that require attention from people who are familiar with C++. util Issues and PRs related to the built-in util module. labels Jun 13, 2020
bnoordhuis
bnoordhuis reviewed Jun 14, 2020
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src/node_util.cc
if (!args[1]->Uint32Value(env->context()).To(&index)) return;
Local<Private> private_symbol = IndexToPrivateSymbol(env, index);
Local<Value> ret;
if (obj->GetPrivate(env->context(), private_symbol).ToLocal(&ret))
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I'm not 100% sure but I don't think GetPrivate() can actually fail provided that obj->IsObject().

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addaleax commented Jun 14, 2020

@bnoordhuis The point isn’t so much as to whether these ops can currently fail or not, it’s more that I want to move more of our code into a state where it is “obviously not broken”, and be consistent about that. At least the SetPrivate() call can fail, and if we didn’t use .ToLocalChecked() & friends as excessively as we currently do, we probably wouldn’t have used it for that call either.

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bnoordhuis commented Jun 14, 2020

We'll have to disagree on what "obviously not broken" means.

Replacing CHECK(args[1]->IsUint32()) with a (recoverable) JS exception just makes it harder to diagnose bugs, IMO.

Point ceded on the SetPrivate() call, although I'd still like people to report it when it fails, because that's likely a bug we need to fix.

(You can probably trigger it if you go out of your way to poison the runtime but normally I would expect it to be a bug on our side.)

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addaleax commented Jun 14, 2020

Point ceded on the SetPrivate() call, although I'd still like people to report it when it fails, because that's likely a bug we need to fix.

Like a lot of operations, it fails when JS execution is being terminated. That’s one of the main points here – it is only obvious that .ToLocalChecked() doesn’t fail in very few cases, so it’s better to avoid it as much as possible.

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bnoordhuis commented Jun 15, 2020

If TerminateExecution() compatibility is the goal here, why don't you mention that in the commit log? That would have avoided this back and forth.

My point about changing the CHECK remains though: it serves no point that I can see.

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addaleax commented Jun 15, 2020

If TerminateExecution() compatibility is the goal here, why don't you mention that in the commit log? That would have avoided this back and forth.

Because I thought it was obvious, sorry. I’ll add Refs: https://github.com/nodejs/node/blob/master/src/README.md#checked-conversion for PRs like this in the future.

My point about changing the CHECK remains though: it serves no point that I can see.

Okay, since you feel strongly about it, I’ve restored it, and switched to the variant that we use when we CHECK() the type (i.e. .As<Uint32>()->Value() instead of ->Uint32Value(…)), as consistency is half of the point of this PR.

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@addaleax addaleax added the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Jun 19, 2020
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nodejs-github-bot commented Jun 19, 2020

CI: https://ci.nodejs.org/job/node-test-pull-request/31960/

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nodejs-github-bot commented Jun 24, 2020

CI: https://ci.nodejs.org/job/node-test-pull-request/32057/

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jasnell pushed a commit that referenced this pull request Jun 25, 2020
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src: handle empty Maybe(Local) in node_util.cc
8e12962 
PR-URL: #33867
Refs: https://github.com/nodejs/node/blob/master/src/README.md#checked-conversion
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>
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jasnell commented Jun 25, 2020

Landed in 8e12962

@jasnell jasnell closed this Jun 25, 2020
codebytere pushed a commit that referenced this pull request Jun 27, 2020
@addaleax @codebytere
src: handle empty Maybe(Local) in node_util.cc
9a52cd9 
PR-URL: #33867
Refs: https://github.com/nodejs/node/blob/master/src/README.md#checked-conversion
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>
@codebytere codebytere mentioned this pull request Jun 28, 2020
Merged
codebytere pushed a commit that referenced this pull request Jun 30, 2020
@addaleax @codebytere
src: handle empty Maybe(Local) in node_util.cc
8a6a644 
PR-URL: #33867
Refs: https://github.com/nodejs/node/blob/master/src/README.md#checked-conversion
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>
codebytere pushed a commit that referenced this pull request Jul 10, 2020
@addaleax @codebytere
src: handle empty Maybe(Local) in node_util.cc
1ad73dd 
PR-URL: #33867
Refs: https://github.com/nodejs/node/blob/master/src/README.md#checked-conversion
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>
codebytere pushed a commit that referenced this pull request Jul 12, 2020
@addaleax @codebytere
src: handle empty Maybe(Local) in node_util.cc
153f292 
PR-URL: #33867
Refs: https://github.com/nodejs/node/blob/master/src/README.md#checked-conversion
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>
@codebytere codebytere mentioned this pull request Jul 13, 2020
Merged
codebytere pushed a commit that referenced this pull request Jul 14, 2020
@addaleax @codebytere
src: handle empty Maybe(Local) in node_util.cc
46dce9b 
PR-URL: #33867
Refs: https://github.com/nodejs/node/blob/master/src/README.md#checked-conversion
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>
@Lusito Lusito mentioned this pull request Nov 14, 2020
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