Add whole-program vtable optimization feature to Clang.

This patch introduces the -fwhole-program-vtables flag, which enables the
whole-program vtable optimization feature (D16795) in Clang.

Differential Revision: http://reviews.llvm.org/D16821

llvm-svn: 261767

1 files changed, 7 insertions, 1 deletions

diff --git a/clang/lib/CodeGen/CodeGenFunction.h b/clang/lib/CodeGen/CodeGenFunction.h
index 1254a0f93fc..9a31c8f78b5 100644
--- a/clang/lib/CodeGen/CodeGenFunction.h
+++ b/clang/lib/CodeGen/CodeGenFunction.h
@@ -1401,7 +1401,7 @@ public:
 
   /// EmitVTablePtrCheckForCall - Virtual method MD is being called via VTable.
   /// If vptr CFI is enabled, emit a check that VTable is valid.
-  void EmitVTablePtrCheckForCall(const CXXMethodDecl *MD, llvm::Value *VTable,
+  void EmitVTablePtrCheckForCall(const CXXRecordDecl *RD, llvm::Value *VTable,
                                  CFITypeCheckKind TCK, SourceLocation Loc);
 
   /// EmitVTablePtrCheck - Emit a check that VTable is a valid virtual table for
@@ -1409,6 +1409,12 @@ public:
   void EmitVTablePtrCheck(const CXXRecordDecl *RD, llvm::Value *VTable,
                           CFITypeCheckKind TCK, SourceLocation Loc);
 
+  /// If whole-program virtual table optimization is enabled, emit an assumption
+  /// that VTable is a member of the type's bitset. Or, if vptr CFI is enabled,
+  /// emit a check that VTable is a member of the type's bitset.
+  void EmitBitSetCodeForVCall(const CXXRecordDecl *RD, llvm::Value *VTable,
+                              SourceLocation Loc);
+
   /// CanDevirtualizeMemberFunctionCalls - Checks whether virtual calls on given
   /// expr can be devirtualized.
   bool CanDevirtualizeMemberFunctionCall(const Expr *Base,