From 170c26d75eb1fb0e8c3c0ae7107ab971bc61e64b Mon Sep 17 00:00:00 2001
From: "Duncan P. N. Exon Smith" <dexonsmith@apple.com>
Date: Tue, 17 Mar 2015 01:14:40 +0000
Subject: MapMetadata: Allow unresolved metadata if it won't change

Allow unresolved nodes through the `MapMetadata()` if
`RF_NoModuleLevelChanges`, since there's no remapping to do anyway.

This fixes PR22929.  I'll add a clang test as a follow-up.

llvm-svn: 232449
---
 llvm/unittests/Transforms/Utils/CMakeLists.txt     |  1 +
 .../unittests/Transforms/Utils/ValueMapperTest.cpp | 27 ++++++++++++++++++++++
 2 files changed, 28 insertions(+)
 create mode 100644 llvm/unittests/Transforms/Utils/ValueMapperTest.cpp

(limited to 'llvm/unittests/Transforms')

diff --git a/llvm/unittests/Transforms/Utils/CMakeLists.txt b/llvm/unittests/Transforms/Utils/CMakeLists.txt
index ffa1d49d380..517ff99ea46 100644
--- a/llvm/unittests/Transforms/Utils/CMakeLists.txt
+++ b/llvm/unittests/Transforms/Utils/CMakeLists.txt
@@ -9,4 +9,5 @@ add_llvm_unittest(UtilsTests
   Cloning.cpp
   IntegerDivision.cpp
   Local.cpp
+  ValueMapperTest.cpp
   )
diff --git a/llvm/unittests/Transforms/Utils/ValueMapperTest.cpp b/llvm/unittests/Transforms/Utils/ValueMapperTest.cpp
new file mode 100644
index 00000000000..137a2607c84
--- /dev/null
+++ b/llvm/unittests/Transforms/Utils/ValueMapperTest.cpp
@@ -0,0 +1,27 @@
+//===- ValueMapper.cpp - Unit tests for ValueMapper -----------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/Metadata.h"
+#include "llvm/Transforms/Utils/ValueMapper.h"
+#include "gtest/gtest.h"
+
+using namespace llvm;
+
+namespace {
+
+TEST(ValueMapperTest, MapMetadataUnresolved) {
+  LLVMContext Context;
+  TempMDTuple T = MDTuple::getTemporary(Context, None);
+
+  ValueToValueMapTy VM;
+  EXPECT_EQ(T.get(), MapMetadata(T.get(), VM, RF_NoModuleLevelChanges));
+}
+
+}
-- 
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