[PATCH] D128958: Add assembler plumbing for sanitize_memtag

[Mitch Phillips via Phabricator via llvm-commits]

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Extends the Asm reader/writer to support reading and writing the
'.tagged' directive (including allowing it on internal global
variables). Also add some extra tooling support, including objdump and
yaml2obj/obj2yaml.

Test that the sanitize_memtag IR attribute produces the expected asm
directive.

Reserves a bit in st_other for AArch64's ELF for signalling to the
linker that a global variable should be tagged. The linker will be
responsible for doing the appropriate setup to ensure that the global
variables are tagged at runtime.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D128958

Files:
  llvm/include/llvm/BinaryFormat/ELF.h
  llvm/include/llvm/MC/MCAsmInfo.h
  llvm/include/llvm/MC/MCDirectives.h
  llvm/include/llvm/MC/MCSymbolELF.h
  llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
  llvm/lib/MC/MCAsmStreamer.cpp
  llvm/lib/MC/MCELFStreamer.cpp
  llvm/lib/MC/MCMachOStreamer.cpp
  llvm/lib/MC/MCParser/AsmParser.cpp
  llvm/lib/MC/MCSymbolELF.cpp
  llvm/lib/ObjectYAML/ELFYAML.cpp
  llvm/test/CodeGen/AArch64/global-tagging.ll
  llvm/tools/llvm-objdump/llvm-objdump.cpp

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