python / python/cpython

`BUILD_INTERPOLATION` and `BUILD_TEMPLATE` perform unnecessary refcount operations

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#145,860 2 comments 0 reactions 0 assignees View on GitHub

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interpreter-core performance type-feature
Dominant language
Python
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Forks
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PR merge metrics
PR metrics pending

Description

Feature or enhancement

Proposal:

BUILD_INTERPOLATION and BUILD_TEMPLATE call _PyInterpolation_Build and _PyTemplate_Build respectively, and then decref their arguments. All other BUILD instructions call a "steal" function, to avoid the unnecessary incref then decref. BUILD_INTERPOLATION and BUILD_TEMPLATE should do the same.

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

No response

Linked PRs
  • gh-148201

Contributor guide

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First steps

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  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start at the BUILD_INTERPOLATION and BUILD_TEMPLATE instruction handlers and the _PyInterpolation_Build and _PyTemplate_Build entry points. Compare them with the other BUILD instructions' steal functions; done means these instructions avoid the unnecessary incref/decref operations.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
backend
Issue type
Feature
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Clearly specified
Newbie friendliness
35/100

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