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Move functionality for patching build ID into a separate rewriter class
and change the way we do the patching. Support build ID in different
note sections in order to update the build ID in the Linux kernel binary
which puts in into ".notes" section instead of ".note.gnu.build-id".
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Some metadata needs to be updated/finalized before the binary context is
emitted into the binary. Add the interface and use it for Linux ORC
update invocation.
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Add MetadataRewriter::postCFGInitializer().
Reviewed By: jobnoorman
Differential Revision: https://reviews.llvm.org/D155153
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Introduce the MetadataRewriter interface to handle updates for various
types of auxiliary data stored in a binary file.
To implement metadata processing using this new interface, all metadata
rewriters should derive from the RewriterBase class and implement
one or more of the following methods, depending on the timing of metadata
read and write operations:
* preCFGInitializer()
* postCFGInitializer() // TBD
* preEmitFinalizer() // TBD
* postEmitFinalizer()
By adopting this approach, we aim to simplify the RewriteInstance class
and improve its scalability to accommodate new extensions of file formats,
including various metadata types of the Linux Kernel.
Differential Revision: https://reviews.llvm.org/D154020
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