Merging r195168:

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r195168 | rnk | 2013-11-19 15:23:00 -0800 (Tue, 19 Nov 2013) | 17 lines

Add a mangler entry point for TBAA rather than using RTTI directly

Summary:
RTTI is not yet implemented for the Microsoft C++ ABI and isn't expected
soon.  We could easily add the mangling, but the error is what prevents
us from silently miscompiling code that expects RTTI.

Instead, add a new mangleTypeName entry point that simply forwards to
mangleName or mangleType to produce a string that isn't part of the ABI.
Itanium can continue to use RTTI names to avoid unecessary test
breakage.

This also seems like the right design.  The fact that TBAA names happen
to be RTTI names is now an implementation detail of the mangler, rather
than part of TBAA.

Differential Revision: http://llvm-reviews.chandlerc.com/D2153
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git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_34@195227 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 6 insertions, 0 deletions

diff --git a/include/clang/AST/Mangle.h b/include/clang/AST/Mangle.h
index e875c31fc0..4df2955aec 100644
--- a/include/clang/AST/Mangle.h
+++ b/include/clang/AST/Mangle.h
@@ -148,6 +148,12 @@ public:
   virtual void mangleDynamicAtExitDestructor(const VarDecl *D,
                                              raw_ostream &) = 0;
 
+  /// Generates a unique string for an externally visible type for use with TBAA
+  /// or type uniquing.
+  /// TODO: Extend this to internal types by generating names that are unique
+  /// across translation units so it can be used with LTO.
+  virtual void mangleTypeName(QualType T, raw_ostream &) = 0;
+
   /// @}
 };