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Similar to #6031, this PR implements suggestions from iwyu to reduce the number of includes in header files by introducing forward declarations and moving includes to source files.
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This PR updates the update-copyright.pl script to also update/add copyright headers to CMake specific files. It further fixes a small typo in the header.
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Fixes 2887.
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As it turns out, self-registering types are problematic with static
linkage [0]. Instead of fixing the issue with linker flags, which seems
possible but also brittle (e.g. the flags may be different for different
linkers), this commit adds an explicit registration of each
preprocessing pass.
[0] https://www.bfilipek.com/2018/02/static-vars-static-lib.html
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This commit refactors how preprocessing pass registration works,
inspired by LLVM's approach [0]. The basic idea is that every
preprocessing pass declares a static variable of type `RegisterPass` in
its source file that registers the pass with the
`PreprocessingPassRegistry` when starting the program. The registry is a
singleton that keeps track of all the available passes and allows other
code to create instances of the passes (note: previously the registry
itself was owning the passes but this is no longer the case). One of the
advantages of this solution is that we have a list of available passes
directly at the beginning of the program, which is useful for example
when parsing options.
As a side effect, this commit also fixes the SortInference pass, which
was expecting arguments other than the preprocessing pass context in its
constructor.
This commit is required for fixing dumping pre/post preprocessing
passes. It is also the ground work for allowing the user to specify a
preprocessing pipeline using command-line arguments.
[0] https://llvm.org/docs/WritingAnLLVMPass.html
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This commit refactors the pbRewrites preprocessing pass into the new
style. This commit is essentially just a code move and adds a regression
test for the preprocessing pass. It also makes use of the
AssertionPipeline::replace function to do proper dependency tracking.
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This commit adds new infrastructure for preprocessing passes. It is preparation only, it does not change how the current preprocessing passes work (this will be done in future commits).
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