Cloning: Copy comdats when cloning globals.

Differential Revision: https://reviews.llvm.org/D28838

llvm-svn: 292430

1 files changed, 16 insertions, 0 deletions

diff --git a/llvm/unittests/Transforms/Utils/Cloning.cpp b/llvm/unittests/Transforms/Utils/Cloning.cpp
index 216bd32c50d..634aa9e7e65 100644
--- a/llvm/unittests/Transforms/Utils/Cloning.cpp
+++ b/llvm/unittests/Transforms/Utils/Cloning.cpp
@@ -405,10 +405,14 @@ protected:
   void SetupModule() { OldM = new Module("", C); }
 
   void CreateOldModule() {
+    auto *CD = OldM->getOrInsertComdat("comdat");
+    CD->setSelectionKind(Comdat::ExactMatch);
+
     auto GV = new GlobalVariable(
         *OldM, Type::getInt32Ty(C), false, GlobalValue::ExternalLinkage,
         ConstantInt::get(Type::getInt32Ty(C), 1), "gv");
     GV->addMetadata(LLVMContext::MD_type, *MDNode::get(C, {}));
+    GV->setComdat(CD);
 
     DIBuilder DBuilder(*OldM);
     IRBuilder<> IBuilder(C);
@@ -419,6 +423,7 @@ protected:
     auto *F =
         Function::Create(FuncType, GlobalValue::PrivateLinkage, "f", OldM);
     F->setPersonalityFn(PersFn);
+    F->setComdat(CD);
 
     // Create debug info
     auto *File = DBuilder.createFile("filename.c", "/file/dir/");
@@ -472,4 +477,15 @@ TEST_F(CloneModule, GlobalMetadata) {
   GlobalVariable *NewGV = NewM->getGlobalVariable("gv");
   EXPECT_NE(nullptr, NewGV->getMetadata(LLVMContext::MD_type));
 }
+
+TEST_F(CloneModule, Comdat) {
+  GlobalVariable *NewGV = NewM->getGlobalVariable("gv");
+  auto *CD = NewGV->getComdat();
+  ASSERT_NE(nullptr, CD);
+  EXPECT_EQ("comdat", CD->getName());
+  EXPECT_EQ(Comdat::ExactMatch, CD->getSelectionKind());
+
+  Function *NewF = NewM->getFunction("f");
+  EXPECT_EQ(CD, NewF->getComdat());
+}
 }