Allow loading LLVM plugins with both legacy and new pass manager by eskarn · Pu...
source link: https://github.com/rust-lang/rust/pull/91125
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Opening a draft PR to get feedback and start discussion on this feature. There is already a codegen option passes which allow giving a list of LLVM pass names, however we currently can't use a LLVM pass plugin (as described here : https://llvm.org/docs/WritingAnLLVMPass.html), the only available passes are the LLVM built-in ones.
The proposed modification would be to add another codegen option pass-plugins, which can be set with a list of paths to shared library files. These libraries are loaded using the LLVM function PassPlugin::Load, which calls the expected symbol lvmGetPassPluginInfo, and register the pipeline parsing and optimization callbacks.
An example usage with a single plugin and 3 passes would look like this in the .cargo/config:
rustflags = [
"-C", "pass-plugins=/tmp/libLLVMPassPlugin",
"-C", "passes=pass1 pass2 pass3",
]This would give the same functionality as the opt LLVM tool directly integrated in rust build system.
Additionally, we can also not specify the passes option, and use a plugin which inserts passes in the optimization pipeline, as one could do using clang.
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