[PATCH] D42592: [COFF] Add minimal support for /guard:cf

[Reid Kleckner via Phabricator via llvm-commits]

rnk created this revision.
rnk added reviewers: ruiu, amccarth.

This patch adds some initial support for Windows control flow guard. At
the end of the day, the linker needs to synthesize a table of RVAs very
similar to the structured exception handler table (/safeseh).

Both /safeseh and /guard:cf take sections of symbol table indices
(.sxdata and .gfids$y) and turn them into RVA tables referenced by the
load config struct in the CRT through special symbols.


https://reviews.llvm.org/D42592

Files:
  lld/COFF/Chunks.cpp
  lld/COFF/Chunks.h
  lld/COFF/Config.h
  lld/COFF/Driver.cpp
  lld/COFF/Driver.h
  lld/COFF/DriverUtils.cpp
  lld/COFF/InputFiles.cpp
  lld/COFF/InputFiles.h
  lld/COFF/Options.td
  lld/COFF/Writer.cpp
  lld/test/COFF/gfids-fallback.s
  lld/test/COFF/gfids-gc.s
  lld/test/COFF/gfids-icf.s

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