Add unittest for new CanReplace flag on MDNodes

This adds a unittest for the support added in r256648 to add
a flag that can be used to prevent RAUW on temporary metadata
used as a map key.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@256938 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/unittests/IR/MetadataTest.cpp b/unittests/IR/MetadataTest.cpp
index 257ab7204c6cbe5cd05498ea4b766cd1fa02404f..a745b235a381b9b21de27dab43f392097dc72e89 100644 (file)
--- a/unittests/IR/MetadataTest.cpp
+++ b/unittests/IR/MetadataTest.cpp
@@ -494,6 +494,20 @@ TEST_F(MDNodeTest, isTemporary) {
   EXPECT_TRUE(T->isTemporary());
 }
 
+#if defined(GTEST_HAS_DEATH_TEST) && !defined(NDEBUG)
+
+TEST_F(MDNodeTest, deathOnNoReplaceTemporaryRAUW) {
+  auto Temp = MDNode::getTemporary(Context, None);
+  Temp->setCanReplace(false);
+  EXPECT_DEATH(Temp->replaceAllUsesWith(nullptr),
+               "Attempted to replace Metadata marked for no replacement");
+  Temp->setCanReplace(true);
+  // Remove the references to Temp; required for teardown.
+  Temp->replaceAllUsesWith(nullptr);
+}
+
+#endif
+
 TEST_F(MDNodeTest, getDistinctWithUnresolvedOperands) {
   // temporary !{}
   auto Temp = MDTuple::getTemporary(Context, None);