1 files changed, 93 insertions, 0 deletions
diff --git a/clang/unittests/Serialization/InMemoryModuleCacheTest.cpp b/clang/unittests/Serialization/InMemoryModuleCacheTest.cpp
new file mode 100644
index 00000000000..356c9ed56f5
--- /dev/null
+++ b/clang/unittests/Serialization/InMemoryModuleCacheTest.cpp
@@ -0,0 +1,93 @@
+//===- InMemoryModuleCacheTest.cpp - InMemoryModuleCache tests ------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Serialization/InMemoryModuleCache.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "gtest/gtest.h"
+
+using namespace llvm;
+using namespace clang;
+
+namespace {
+
+std::unique_ptr<MemoryBuffer> getBuffer(int I) {
+  SmallVector<char, 8> Bytes;
+  raw_svector_ostream(Bytes) << "data:" << I;
+  return MemoryBuffer::getMemBuffer(StringRef(Bytes.data(), Bytes.size()), "",
+                                    /* RequiresNullTerminator = */ false);
+}
+
+TEST(InMemoryModuleCacheTest, addBuffer) {
+  auto B1 = getBuffer(1);
+  auto B2 = getBuffer(2);
+  auto B3 = getBuffer(3);
+  auto *RawB1 = B1.get();
+  auto *RawB2 = B2.get();
+  auto *RawB3 = B3.get();
+
+  // Add a few buffers.
+  InMemoryModuleCache Cache;
+  EXPECT_EQ(RawB1, &Cache.addBuffer("1", std::move(B1)));
+  EXPECT_EQ(RawB2, &Cache.addBuffer("2", std::move(B2)));
+  EXPECT_EQ(RawB3, &Cache.addBuffer("3", std::move(B3)));
+  EXPECT_EQ(RawB1, Cache.lookupBuffer("1"));
+  EXPECT_EQ(RawB2, Cache.lookupBuffer("2"));
+  EXPECT_EQ(RawB3, Cache.lookupBuffer("3"));
+  EXPECT_FALSE(Cache.isBufferFinal("1"));
+  EXPECT_FALSE(Cache.isBufferFinal("2"));
+  EXPECT_FALSE(Cache.isBufferFinal("3"));
+
+  // Remove the middle buffer.
+  EXPECT_FALSE(Cache.tryToRemoveBuffer("2"));
+  EXPECT_EQ(nullptr, Cache.lookupBuffer("2"));
+  EXPECT_FALSE(Cache.isBufferFinal("2"));
+
+  // Replace the middle buffer.
+  B2 = getBuffer(2);
+  RawB2 = B2.get();
+  EXPECT_EQ(RawB2, &Cache.addBuffer("2", std::move(B2)));
+
+  // Check that nothing is final.
+  EXPECT_FALSE(Cache.isBufferFinal("1"));
+  EXPECT_FALSE(Cache.isBufferFinal("2"));
+  EXPECT_FALSE(Cache.isBufferFinal("3"));
+}
+
+TEST(InMemoryModuleCacheTest, finalizeCurrentBuffers) {
+  // Add a buffer.
+  InMemoryModuleCache Cache;
+  auto B1 = getBuffer(1);
+  auto *RawB1 = B1.get();
+  Cache.addBuffer("1", std::move(B1));
+  ASSERT_FALSE(Cache.isBufferFinal("1"));
+
+  // Finalize it.
+  Cache.finalizeCurrentBuffers();
+  EXPECT_TRUE(Cache.isBufferFinal("1"));
+  EXPECT_TRUE(Cache.tryToRemoveBuffer("1"));
+  EXPECT_EQ(RawB1, Cache.lookupBuffer("1"));
+  EXPECT_TRUE(Cache.isBufferFinal("1"));
+
+  // Repeat.
+  auto B2 = getBuffer(2);
+  auto *RawB2 = B2.get();
+  Cache.addBuffer("2", std::move(B2));
+  EXPECT_FALSE(Cache.isBufferFinal("2"));
+
+  Cache.finalizeCurrentBuffers();
+  EXPECT_TRUE(Cache.isBufferFinal("1"));
+  EXPECT_TRUE(Cache.isBufferFinal("2"));
+  EXPECT_TRUE(Cache.tryToRemoveBuffer("1"));
+  EXPECT_TRUE(Cache.tryToRemoveBuffer("2"));
+  EXPECT_EQ(RawB1, Cache.lookupBuffer("1"));
+  EXPECT_EQ(RawB2, Cache.lookupBuffer("2"));
+  EXPECT_TRUE(Cache.isBufferFinal("1"));
+  EXPECT_TRUE(Cache.isBufferFinal("2"));
+}
+
+} // namespace