[PATCH] D99487: [CodeGen] Port basic block sections from ELF to COFF

[Fangrui Song via Phabricator via llvm-commits]

MaskRay added inline comments.


================
Comment at: llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp:1712
+          COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_LNK_COMDAT,
+      SectionKind::getText(), COMDATSymName,
+      COFF::IMAGE_COMDAT_SELECT_NODUPLICATES, UniqueID);
----------------
TaoPan wrote:
> tmsriram wrote:
> > COMDATSymName can be folded to be equal to MBB.getSymbol()->getName() here?  Plus, you are not preserving the .text.hot prefix that the original function might get here.  Is this future work?  If the original function is named .text.hot.foo, the basic block will still be named .text.foo.__part.1 which is not right.
> > 
> > Plus, what about exception handling sections like ".eh.*"?
> Thanks! I'll redesign section name and comdat symbol name.
> The text section with prefix "hot" and "unlikely" won't be constructed here, I added COFF text section prefix "hot" and "unlikely" in D92073. In ELF override function, also not handling text section with prefix "hot" and "unlikely".
> The text section with prefix "split" will be constructed here, I plan to add related code in MFS COFF patch.
> Also, exception handling section is future work that support basic block sections Windows COFF exception handling.
This is complex. PE-COFF has multiple COMDAT seletion kinds. I want to see a holistic plan how every component is going to be implemented.


Repository:
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  https://reviews.llvm.org/D99487/new/

https://reviews.llvm.org/D99487