[llvm] r256938 - Add unittest for new CanReplace flag on MDNodes

[Teresa Johnson via llvm-commits]

Author: tejohnson
Date: Wed Jan  6 09:02:40 2016
New Revision: 256938

URL: http://llvm.org/viewvc/llvm-project?rev=256938&view=rev
Log:
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.

Modified:
    llvm/trunk/unittests/IR/MetadataTest.cpp

Modified: llvm/trunk/unittests/IR/MetadataTest.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/unittests/IR/MetadataTest.cpp?rev=256938&r1=256937&r2=256938&view=diff
==============================================================================
--- llvm/trunk/unittests/IR/MetadataTest.cpp (original)
+++ llvm/trunk/unittests/IR/MetadataTest.cpp Wed Jan  6 09:02:40 2016
@@ -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);