[PATCH] D38903: [ubsan] Only use indirect RTTI in prologues on Darwin

[Vedant Kumar via Phabricator via cfe-commits]

vsk created this revision.

Using a layer of indirection to point to RTTI through function prologues
is not supported on some setups. One reported error message is:

  error: Cannot represent a difference across sections

This is a regression. This patch limits the indirect RTTI behavior to
Darwin, where we know it works. We can add more configurations to the
whitelist once we know it won't be a regression.

For context, see the mailing list discussion re:
r313096 - [ubsan] Function Sanitizer: Don't require writable text segments

Testing: check-clang, check-ubsan


https://reviews.llvm.org/D38903

Files:
  lib/CodeGen/CGExpr.cpp
  lib/CodeGen/CodeGenFunction.cpp
  lib/CodeGen/TargetInfo.cpp
  test/CodeGenCXX/catch-undef-behavior.cpp

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