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src: use stricter compile-time guidance #46509

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merged 1 commit into from
Apr 4, 2023
Merged

src: use stricter compile-time guidance #46509

merged 1 commit into from
Apr 4, 2023

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tniessen
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@tniessen tniessen commented Feb 5, 2023 •
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SnapshotSerializerDeserializer::GetName() appears to confuse static analysis such as Coverity.

This changes the function structure to a sequence of if-else blocks and marks all branch conditions as constexpr. (Unfortunately, this results in a dangling else keyword in the V macro.)

As a side effect, this change ensures that GetName<T>() can only be called for known types T (instead of returning an empty string). As per a request in the PR discussion, this change does not ensure that GetName<T>() can only be called for known types T and instead still returns an empty string in that case.

Also use std::is_unsigned_v instead of !std::is_signed_v.

@tniessen tniessen added the c++ Issues and PRs that require attention from people who are familiar with C++. label Feb 5, 2023
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Review requested:

  • @nodejs/startup

@nodejs-github-bot nodejs-github-bot added the needs-ci PRs that need a full CI run. label Feb 5, 2023
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joyeecheung commented Feb 5, 2023 •
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As a side effect, this change ensures that GetName() can only be called for known types T (instead of returning an empty string).

Why would this be necessary? This is a debugging facility that decorates the log output, it would be fine to just give up if "I don't know what it's called, so I won't attempt to tell you what the type name is, because RTTI is disallowed" (I think I relied on this when developing deserialization/serialization of new types, which was fine because it's possible to guess the name from the context anyway).

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tniessen commented Feb 5, 2023 •
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Why would this be necessary?

It's certainly not necessary. I can change it to allow unknown types, but unless I'm missing something, I don't really see the point. Wouldn't it only take a one-line change to add new non-arithmetic types?

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@joyeecheung is your comment blocking?

@tniessen tniessen added author ready PRs that have at least one approval, no pending requests for changes, and a CI started. request-ci Add this label to start a Jenkins CI on a PR. labels Feb 19, 2023
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joyeecheung commented Feb 19, 2023 •
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Sorry for missing the ping. I wouldn't say it's a hill that I'd die on but it's also weird that this restriction exists. The function is just a utility that attempts to assemble a human-readable name for a type (or it's just poor-man's RTTI). Returning an empty string for a type that we don't special case is totally acceptable. Does the static analyzer complain about it? If it does it would make more sense to do if (!std::is_arithmetic_v<T>) { return ""; /* gives up */ } than adding a static assert.

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src: use stricter compile-time guidance
8ddfb52 
SnapshotSerializerDeserializer::GetName() appears to confuse static
analysis such as Coverity.

This changes the function structure to a sequence of if-else blocks and
marks all branch conditions as constexpr. (Unfortunately, this results
in a dangling 'else' keyword in the V macro.)

As per a request in the PR discussion, this change does _not_ ensure
that GetName<T>() can only be called for known types T and instead still
returns an empty string in that case.

Also use std::is_unsigned_v instead of !std::is_signed_v.
@tniessen tniessen force-pushed the src-snapshotable-getname-constexpr branch from 451850a to 8ddfb52 Compare March 29, 2023 12:26
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@joyeecheung Sorry about the delay, I've updated the PR as requested. PTAL.

@aduh95 aduh95 added the request-ci Add this label to start a Jenkins CI on a PR. label Mar 29, 2023
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mhdawson
mhdawson approved these changes Mar 30, 2023
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LGTM

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CI: https://ci.nodejs.org/job/node-test-pull-request/50720/

This was referenced Mar 31, 2023
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@nodejs-github-bot nodejs-github-bot merged commit aa3dbe3 into nodejs:main Apr 4, 2023
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RafaelGSS pushed a commit that referenced this pull request Apr 5, 2023
@tniessen @RafaelGSS
src: use stricter compile-time guidance
8fe9a14 
SnapshotSerializerDeserializer::GetName() appears to confuse static
analysis such as Coverity.

This changes the function structure to a sequence of if-else blocks and
marks all branch conditions as constexpr. (Unfortunately, this results
in a dangling 'else' keyword in the V macro.)

As per a request in the PR discussion, this change does _not_ ensure
that GetName<T>() can only be called for known types T and instead still
returns an empty string in that case.

Also use std::is_unsigned_v instead of !std::is_signed_v.

PR-URL: #46509
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michael Dawson <midawson@redhat.com>
RafaelGSS pushed a commit that referenced this pull request Apr 5, 2023
@tniessen @RafaelGSS
src: use stricter compile-time guidance
a4e5ae7 
SnapshotSerializerDeserializer::GetName() appears to confuse static
analysis such as Coverity.

This changes the function structure to a sequence of if-else blocks and
marks all branch conditions as constexpr. (Unfortunately, this results
in a dangling 'else' keyword in the V macro.)

As per a request in the PR discussion, this change does _not_ ensure
that GetName<T>() can only be called for known types T and instead still
returns an empty string in that case.

Also use std::is_unsigned_v instead of !std::is_signed_v.

PR-URL: #46509
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michael Dawson <midawson@redhat.com>
@RafaelGSS RafaelGSS mentioned this pull request Apr 6, 2023
Merged
RafaelGSS pushed a commit that referenced this pull request Apr 6, 2023
@tniessen @RafaelGSS
src: use stricter compile-time guidance
93392a0 
SnapshotSerializerDeserializer::GetName() appears to confuse static
analysis such as Coverity.

This changes the function structure to a sequence of if-else blocks and
marks all branch conditions as constexpr. (Unfortunately, this results
in a dangling 'else' keyword in the V macro.)

As per a request in the PR discussion, this change does _not_ ensure
that GetName<T>() can only be called for known types T and instead still
returns an empty string in that case.

Also use std::is_unsigned_v instead of !std::is_signed_v.

PR-URL: #46509
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michael Dawson <midawson@redhat.com>
RafaelGSS pushed a commit that referenced this pull request Apr 7, 2023
@tniessen @RafaelGSS
src: use stricter compile-time guidance
b748b69 
SnapshotSerializerDeserializer::GetName() appears to confuse static
analysis such as Coverity.

This changes the function structure to a sequence of if-else blocks and
marks all branch conditions as constexpr. (Unfortunately, this results
in a dangling 'else' keyword in the V macro.)

As per a request in the PR discussion, this change does _not_ ensure
that GetName<T>() can only be called for known types T and instead still
returns an empty string in that case.

Also use std::is_unsigned_v instead of !std::is_signed_v.

PR-URL: #46509
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michael Dawson <midawson@redhat.com>
RafaelGSS pushed a commit that referenced this pull request Apr 8, 2023
@tniessen @RafaelGSS
src: use stricter compile-time guidance
4405fc8 
SnapshotSerializerDeserializer::GetName() appears to confuse static
analysis such as Coverity.

This changes the function structure to a sequence of if-else blocks and
marks all branch conditions as constexpr. (Unfortunately, this results
in a dangling 'else' keyword in the V macro.)

As per a request in the PR discussion, this change does _not_ ensure
that GetName<T>() can only be called for known types T and instead still
returns an empty string in that case.

Also use std::is_unsigned_v instead of !std::is_signed_v.

PR-URL: #46509
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michael Dawson <midawson@redhat.com>
RafaelGSS pushed a commit that referenced this pull request Apr 13, 2023
@tniessen @RafaelGSS
src: use stricter compile-time guidance
52a01e2 
SnapshotSerializerDeserializer::GetName() appears to confuse static
analysis such as Coverity.

This changes the function structure to a sequence of if-else blocks and
marks all branch conditions as constexpr. (Unfortunately, this results
in a dangling 'else' keyword in the V macro.)

As per a request in the PR discussion, this change does _not_ ensure
that GetName<T>() can only be called for known types T and instead still
returns an empty string in that case.

Also use std::is_unsigned_v instead of !std::is_signed_v.

PR-URL: #46509
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michael Dawson <midawson@redhat.com>
danielleadams pushed a commit that referenced this pull request Jul 6, 2023
@tniessen @danielleadams
src: use stricter compile-time guidance
3c28a18 
SnapshotSerializerDeserializer::GetName() appears to confuse static
analysis such as Coverity.

This changes the function structure to a sequence of if-else blocks and
marks all branch conditions as constexpr. (Unfortunately, this results
in a dangling 'else' keyword in the V macro.)

As per a request in the PR discussion, this change does _not_ ensure
that GetName<T>() can only be called for known types T and instead still
returns an empty string in that case.

Also use std::is_unsigned_v instead of !std::is_signed_v.

PR-URL: #46509
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michael Dawson <midawson@redhat.com>
MoLow pushed a commit to MoLow/node that referenced this pull request Jul 6, 2023
@tniessen @MoLow
src: use stricter compile-time guidance
0fbfb28 
SnapshotSerializerDeserializer::GetName() appears to confuse static
analysis such as Coverity.

This changes the function structure to a sequence of if-else blocks and
marks all branch conditions as constexpr. (Unfortunately, this results
in a dangling 'else' keyword in the V macro.)

As per a request in the PR discussion, this change does _not_ ensure
that GetName<T>() can only be called for known types T and instead still
returns an empty string in that case.

Also use std::is_unsigned_v instead of !std::is_signed_v.

PR-URL: nodejs#46509
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michael Dawson <midawson@redhat.com>
@danielleadams danielleadams mentioned this pull request Jul 10, 2023
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