[PATCH] D51429: [AArch64] Return Address Signing B Key Support

[Luke Cheeseman via Phabricator via cfe-commits]

LukeCheeseman created this revision.
LukeCheeseman added reviewers: kcc, pcc, eugenis, vlad.tsyrklevich.
Herald added a reviewer: javed.absar.
Herald added subscribers: cfe-commits, kristof.beyls.

- Add command line options for selecting the B key when enabling return address signing (also tidy up the msign_return_address tablegen definiton by suffixing the option with EQ)
- This expands the -msign-return-address=<scope> to now be -msign-return-address=<scope>[+<key>] where <key> is one of a_key or b_key
- Generate the "sign-return-address-key" function attribute with the relevant key


Repository:
  rC Clang

https://reviews.llvm.org/D51429

Files:
  include/clang/Driver/Options.td
  include/clang/Frontend/CodeGenOptions.def
  include/clang/Frontend/CodeGenOptions.h
  lib/CodeGen/TargetInfo.cpp
  lib/Driver/ToolChains/Clang.cpp
  lib/Frontend/CompilerInvocation.cpp
  test/CodeGen/aarch64-sign-return-address.c

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