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infer_clone/website/docs/checker-loop-hoisting.md

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[website] make doc-publish Summary: New website! Now with one page per checker, and only one page containing all issue types for easy tooling. Each checker page also lists the issue types it can report. For now only issue types with documentation appear in either page, filling these up is still TODO. Reviewed By: mityal Differential Revision: D21934465 fbshipit-source-id: 82ae1e417
5 years ago
---
title: "Loop Hoisting"
description: "Detect opportunities to hoist function calls that are invariant outside of loop bodies for efficiency."
---
Detect opportunities to hoist function calls that are invariant outside of loop bodies for efficiency.
Activate with `--loop-hoisting`.
Supported languages:
- C/C++/ObjC: Yes
[website] Updating website Summary: updating website. The update was triggered by `make doc-publish`. Reviewed By: jvillard Differential Revision: D26424662 fbshipit-source-id: 5be2369cd
4 years ago
- C#/.Net: Yes
[website] Update website Summary: Update the website to include nil related issues for objective-c Also fixed a typo + syntax highlighting Reviewed By: jvillard Differential Revision: D28638621 fbshipit-source-id: 148f2dd3f
4 years ago
- Erlang: Yes
- Java: Yes
[website] make doc-publish Summary: New website! Now with one page per checker, and only one page containing all issue types for easy tooling. Each checker page also lists the issue types it can report. For now only issue types with documentation appear in either page, filling these up is still TODO. Reviewed By: mityal Differential Revision: D21934465 fbshipit-source-id: 82ae1e417
5 years ago
[website] make docs URLs absolute Summary: A bug in docusaurus makes relative URLs fail depending on how the page was accessed, because the URL of a page in docs/ will end in / if accessed directly or via hyperlink, but that / will be omitted when clicking on the sidebar. The final / makes all the difference when interpreting relative URLs so relative URLs are essentially broken. See https://github.com/facebook/docusaurus/issues/2832 for more details. This changes URL generation to generate URLs /docs/next/..., and manually substitute relative URLs that had been written by hand. Also fix a few other things about outdated links/comments. Finally, `make doc-publish`. Reviewed By: dulmarod Differential Revision: D22117187 fbshipit-source-id: 32e2ba7e1
4 years ago
This checker detects opportunities to hoist function calls that are invariant to outside of loop bodies. The hoisting analysis relies on [purity](/docs/next/checker-purity) analysis to determine whather a function is pure or not.
It has an additional mode that reports [loop-invariant functions that are expensive](/docs/next/all-issue-types#expensive_loop_invariant_call) (i.e. at least linear). This is enabled by the flag `--hoisting-report-only-expensive`.
## List of Issue Types
The following issue types are reported by this checker:
- [EXPENSIVE_LOOP_INVARIANT_CALL](/docs/next/all-issue-types#expensive_loop_invariant_call)
- [INVARIANT_CALL](/docs/next/all-issue-types#invariant_call)