[MS-ABI] Implements MS-compatible RTTI

Enables the emission of MS-compatible RTTI data structures for use with 
typeid, dynamic_cast and exceptions.  Does not implement dynamic_cast 
or exceptions.  As an artiface, typeid works in some cases but proper 
support an testing will coming in a subsequent patch.

majnemer has fuzzed the results.  Test cases included.

Differential Revision: http://reviews.llvm.org/D3833

llvm-svn: 209523

1 files changed, 11 insertions, 2 deletions

diff --git a/clang/lib/CodeGen/CodeGenModule.h b/clang/lib/CodeGen/CodeGenModule.h
index 7b467291e42..eff51cea8bd 100644
--- a/clang/lib/CodeGen/CodeGenModule.h
+++ b/clang/lib/CodeGen/CodeGenModule.h
@@ -528,10 +528,10 @@ public:
     AtomicGetterHelperFnMap[Ty] = Fn;
   }
 
-  llvm::Constant *getTypeDescriptor(QualType Ty) {
+  llvm::Constant *getTypeDescriptorFromMap(QualType Ty) {
     return TypeDescriptorMap[Ty];
   }
-  void setTypeDescriptor(QualType Ty, llvm::Constant *C) {
+  void setTypeDescriptorInMap(QualType Ty, llvm::Constant *C) {
     TypeDescriptorMap[Ty] = C;
   }
 
@@ -710,6 +710,12 @@ public:
   /// The type of a generic block literal.
   llvm::Type *getGenericBlockLiteralType();
 
+  /// \brief Gets or a creats a Microsoft TypeDescriptor.
+  llvm::Constant *getMSTypeDescriptor(QualType Ty);
+  /// \brief Gets or a creats a Microsoft CompleteObjectLocator.
+  llvm::GlobalVariable *getMSCompleteObjectLocator(const CXXRecordDecl *RD,
+                                                   const VPtrInfo *Info);
+
   /// Gets the address of a block which requires no captures.
   llvm::Constant *GetAddrOfGlobalBlock(const BlockExpr *BE, const char *);
   
@@ -945,6 +951,9 @@ public:
     F->setLinkage(getFunctionLinkage(GD));
   }
 
+  /// \brief Returns the appropriate linkage for the TypeInfo struct for a type.
+  llvm::GlobalVariable::LinkageTypes getTypeInfoLinkage(QualType Ty);
+
   /// Return the appropriate linkage for the vtable, VTT, and type information
   /// of the given class.
   llvm::GlobalVariable::LinkageTypes getVTableLinkage(const CXXRecordDecl *RD);