From 654542a5ed9063a48f952a2f18e4a692aa3b54dc Mon Sep 17 00:00:00 2001
From: Rafael Espindola <rafael.espindola@gmail.com>
Date: Fri, 16 Jan 2015 19:23:42 +0000
Subject: Add comdats to the RTTI variables in the microsoft abi.

llvm-svn: 226303
---
 clang/lib/CodeGen/MicrosoftCXXABI.cpp | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

(limited to 'clang/lib/CodeGen/MicrosoftCXXABI.cpp')

diff --git a/clang/lib/CodeGen/MicrosoftCXXABI.cpp b/clang/lib/CodeGen/MicrosoftCXXABI.cpp
index 7fe5ec5a738..1402b5263b6 100644
--- a/clang/lib/CodeGen/MicrosoftCXXABI.cpp
+++ b/clang/lib/CodeGen/MicrosoftCXXABI.cpp
@@ -2856,6 +2856,8 @@ llvm::GlobalVariable *MSRTTIBuilder::getClassHierarchyDescriptor() {
   auto CHD = new llvm::GlobalVariable(Module, Type, /*Constant=*/true, Linkage,
                                       /*Initializer=*/nullptr,
                                       MangledName.c_str());
+  if (CHD->isWeakForLinker())
+    CHD->setComdat(CGM.getModule().getOrInsertComdat(CHD->getName()));
 
   // Initialize the base class ClassHierarchyDescriptor.
   llvm::Constant *Fields[] = {
@@ -2889,6 +2891,8 @@ MSRTTIBuilder::getBaseClassArray(SmallVectorImpl<MSRTTIClass> &Classes) {
   auto *BCA = new llvm::GlobalVariable(
       Module, ArrType,
       /*Constant=*/true, Linkage, /*Initializer=*/nullptr, MangledName.c_str());
+  if (BCA->isWeakForLinker())
+    BCA->setComdat(CGM.getModule().getOrInsertComdat(BCA->getName()));
 
   // Initialize the BaseClassArray.
   SmallVector<llvm::Constant *, 8> BaseClassArrayData;
@@ -2929,6 +2933,8 @@ MSRTTIBuilder::getBaseClassDescriptor(const MSRTTIClass &Class) {
   auto BCD = new llvm::GlobalVariable(Module, Type, /*Constant=*/true, Linkage,
                                       /*Initializer=*/nullptr,
                                       MangledName.c_str());
+  if (BCD->isWeakForLinker())
+    BCD->setComdat(CGM.getModule().getOrInsertComdat(BCD->getName()));
 
   // Initialize the BaseClassDescriptor.
   llvm::Constant *Fields[] = {
@@ -2988,6 +2994,8 @@ MSRTTIBuilder::getCompleteObjectLocator(const VPtrInfo *Info) {
   if (!ABI.isImageRelative())
     FieldsRef = FieldsRef.drop_back();
   COL->setInitializer(llvm::ConstantStruct::get(Type, FieldsRef));
+  if (COL->isWeakForLinker())
+    COL->setComdat(CGM.getModule().getOrInsertComdat(COL->getName()));
   return COL;
 }
 
@@ -3019,13 +3027,14 @@ llvm::Constant *MicrosoftCXXABI::getAddrOfRTTIDescriptor(QualType Type) {
     llvm::ConstantDataArray::getString(CGM.getLLVMContext(), TypeInfoString)};
   llvm::StructType *TypeDescriptorType =
       getTypeDescriptorType(TypeInfoString);
-  return llvm::ConstantExpr::getBitCast(
-      new llvm::GlobalVariable(
-          CGM.getModule(), TypeDescriptorType, /*Constant=*/false,
-          getLinkageForRTTI(Type),
-          llvm::ConstantStruct::get(TypeDescriptorType, Fields),
-          MangledName.c_str()),
-      CGM.Int8PtrTy);
+  auto *Var = new llvm::GlobalVariable(
+      CGM.getModule(), TypeDescriptorType, /*Constant=*/false,
+      getLinkageForRTTI(Type),
+      llvm::ConstantStruct::get(TypeDescriptorType, Fields),
+      MangledName.c_str());
+  if (Var->isWeakForLinker())
+    Var->setComdat(CGM.getModule().getOrInsertComdat(Var->getName()));
+  return llvm::ConstantExpr::getBitCast(Var, CGM.Int8PtrTy);
 }
 
 /// \brief Gets or a creates a Microsoft CompleteObjectLocator.
-- 
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