[PATCH] D17938: CodeGen: Use PLT relocations for relative references to unnamed_addr functions.

[Peter Collingbourne via llvm-commits]

pcc created this revision.
pcc added a reviewer: rafael.
pcc added a subscriber: llvm-commits.

The relative vtable ABI (PR26723) needs PLT relocations to refer to virtual
functions defined in other DSOs. The unnamed_addr attribute means that the
function's address is not significant, so we're allowed to substitute it
with the address of a PLT entry.

Also includes a bonus feature: addends for COFF image-relative references.

http://reviews.llvm.org/D17938

Files:
  include/llvm/CodeGen/TargetLoweringObjectFileImpl.h
  include/llvm/Target/TargetLoweringObjectFile.h
  lib/CodeGen/AsmPrinter/AsmPrinter.cpp
  lib/CodeGen/TargetLoweringObjectFileImpl.cpp
  lib/Target/ARM/ARMTargetObjectFile.h
  lib/Target/X86/X86TargetObjectFile.cpp
  lib/Target/X86/X86TargetObjectFile.h
  test/CodeGen/ARM/plt-relative-reloc.ll
  test/CodeGen/X86/x86-64-plt-relative-reloc.ll
  test/CodeGen/X86/x86-plt-relative-reloc.ll
  test/MC/COFF/cross-section-relative.ll
  test/MC/MachO/AArch64/cstexpr-gotpcrel.ll

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