Rework interface for bitset-using features to use a notion of LTO visibility.

Bitsets, and the compiler features they rely on (vtable opt, CFI),
only have visibility within the LTO'd part of the linkage unit. Therefore,
only enable these features for classes with hidden LTO visibility. This
notion is based on object file visibility or (on Windows)
dllimport/dllexport attributes.

We provide the [[clang::lto_visibility_public]] attribute to override the
compiler's LTO visibility inference in cases where the class is defined
in the non-LTO'd part of the linkage unit, or where the ABI supports
calling classes derived from abstract base classes with hidden visibility
in other linkage units (e.g. COM on Windows).

If the cross-DSO CFI mode is enabled, bitset checks are emitted even for
classes with public LTO visibility, as that mode uses a separate mechanism
to cause bitsets to be exported.

This mechanism replaces the whole-program-vtables blacklist, so remove the
-fwhole-program-vtables-blacklist flag.

Because __declspec(uuid()) now implies [[clang::lto_visibility_public]], the
support for the special attr:uuid blacklist entry is removed.

Differential Revision: http://reviews.llvm.org/D18635

llvm-svn: 267784

2 files changed, 0 insertions, 21 deletions

diff --git a/clang/runtime/CMakeLists.txt b/clang/runtime/CMakeLists.txt
index 6d10e71d727..e72847cb53d 100644
--- a/clang/runtime/CMakeLists.txt
+++ b/clang/runtime/CMakeLists.txt
@@ -148,16 +148,3 @@ if(LLVM_BUILD_EXTERNAL_COMPILER_RT AND EXISTS ${COMPILER_RT_SRC_ROOT}/)
       VERBATIM)
   endif()
 endif()
-
-set(src "${CMAKE_CURRENT_SOURCE_DIR}/vtables_blacklist.txt")
-set(dst "${LLVM_LIBRARY_OUTPUT_INTDIR}/clang/${CLANG_VERSION}/vtables_blacklist.txt")
-add_custom_command(OUTPUT ${dst}
-                   DEPENDS ${src}
-                   COMMAND ${CMAKE_COMMAND} -E copy_if_different ${src} ${dst}
-                   COMMENT "Copying vtables blacklist")
-add_custom_target(vtables_blacklist DEPENDS ${dst})
-set_target_properties(vtables_blacklist PROPERTIES FOLDER "Misc")
-if(TARGET clang)
-  add_dependencies(clang vtables_blacklist)
-endif()
-install(FILES ${src} DESTINATION lib${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION})
diff --git a/clang/runtime/vtables_blacklist.txt b/clang/runtime/vtables_blacklist.txt
deleted file mode 100644
index f2016428d80..00000000000
--- a/clang/runtime/vtables_blacklist.txt
+++ /dev/null
@@ -1,8 +0,0 @@
-# Standard library types.
-type:std::*
-
-# The stdext namespace contains Microsoft standard library extensions.
-type:stdext::*
-
-# Types with a uuid attribute, i.e. COM types.
-type:attr:uuid