[6.2][Caching][Macro] Make macro plugin options cacheable #80751
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cachemeifyoucan
commented
Apr 10, 2025
cachemeifyoucan
commented
- Explanation: Make macro plugin options cacheable by applying prefix mapping to all of them.
- Scope: Allows swift caching to get more cache hits when the identical macro dylibs are relocated.
- Issues: rdar://148465899
- Original PRs: [Caching][Macro] Make macro plugin options cacheable #80474
- Risk: Low. Swift caching only.
- Testing: Unit Test
- Reviewers: @benlangmuir
Currently, the macro plugin options are included as cache key and the absolute path of the plugin executable and library will affect cache hit, even the plugin itself is identical. Using the new option `-resolved-plugin-validation` flag, the macro plugin paths are remapped just like the other paths during dependency scanning. `swift-frontend` will unmap to its original path during the compilation, make sure the content hasn't changed, and load the plugin. It also hands few other corner cases for macro plugins: * Make sure the plugin options in the swift module is prefix mapped. * Make sure the remarks of the macro loading is not cached, as the mesasge includes the absolute path of the plugin, and is not cacheable. rdar://148465899 (cherry picked from commit 3d38d0d)
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@swift-ci please test |
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