[PATCH] D55896: [MC] [AArch64] Support resolving fixups for :abs_g0: etc.

[Eli Friedman via Phabricator via llvm-commits]

efriedma created this revision.
efriedma added reviewers: dmgreen, peter.smith, pcc, mstorsjo.
Herald added subscribers: kristof.beyls, javed.absar.

This requires a bit more code than other fixups, to distingush between abs_g0/abs_g1/etc.  Actually, I think some of the other fixups are missing some checks, but I won't try to address that here.

I haven't seen any real-world code that uses a construct like this, but it clearly should work, and we're considering using it in the implementation of localescape/localrecover on Windows (see https://reviews.llvm.org/D53540).  I've verified that binutils produces the same code as llvm-mc for the testcase.

This currently doesn't include support for the *_s variants (that requires a bit more work to set the instruction opcode).


Repository:
  rL LLVM

https://reviews.llvm.org/D55896

Files:
  lib/Target/AArch64/MCTargetDesc/AArch64AsmBackend.cpp
  test/MC/AArch64/fixup-absolute.s
  test/MC/AArch64/fixup-out-of-range.s

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