[ProfileData] Add unit test infrastructure for sample profile reader/writer

Summary:
Adds support for in-memory round-trip of sample profile data along with basic
round trip unit tests. This will also make it easier to include unit tests for
future changes to sample profiling.

Reviewers: davidxl, dnovillo, silvas

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D15211

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@255264 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 103 insertions, 0 deletions

diff --git a/unittests/ProfileData/CMakeLists.txt b/unittests/ProfileData/CMakeLists.txt
index 79137c9510a..011f8c58179 100644
--- a/unittests/ProfileData/CMakeLists.txt
+++ b/unittests/ProfileData/CMakeLists.txt
@@ -7,4 +7,5 @@ set(LLVM_LINK_COMPONENTS
 add_llvm_unittest(ProfileDataTests
   CoverageMappingTest.cpp
   InstrProfTest.cpp
+  SampleProfTest.cpp
   )
diff --git a/unittests/ProfileData/SampleProfTest.cpp b/unittests/ProfileData/SampleProfTest.cpp
new file mode 100644
index 00000000000..aa1144d7913
--- /dev/null
+++ b/unittests/ProfileData/SampleProfTest.cpp
@@ -0,0 +1,102 @@
+//===- unittest/ProfileData/SampleProfTest.cpp -------------------*- C++
+//-*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ProfileData/SampleProfReader.h"
+#include "llvm/ProfileData/SampleProfWriter.h"
+#include "gtest/gtest.h"
+
+#include <cstdarg>
+
+using namespace llvm;
+using namespace sampleprof;
+
+static ::testing::AssertionResult NoError(std::error_code EC) {
+  if (!EC)
+    return ::testing::AssertionSuccess();
+  return ::testing::AssertionFailure() << "error " << EC.value() << ": "
+                                       << EC.message();
+}
+
+namespace {
+
+struct SampleProfTest : ::testing::Test {
+  std::string Data;
+  std::unique_ptr<raw_ostream> OS;
+  std::unique_ptr<SampleProfileWriter> Writer;
+  std::unique_ptr<SampleProfileReader> Reader;
+
+  SampleProfTest()
+      : Data(), OS(new raw_string_ostream(Data)), Writer(), Reader() {}
+
+  void createWriter(SampleProfileFormat Format) {
+    auto WriterOrErr = SampleProfileWriter::create(OS, Format);
+    ASSERT_TRUE(NoError(WriterOrErr.getError()));
+    Writer = std::move(WriterOrErr.get());
+  }
+
+  void readProfile(std::unique_ptr<MemoryBuffer> &Profile) {
+    auto ReaderOrErr = SampleProfileReader::create(Profile, getGlobalContext());
+    ASSERT_TRUE(NoError(ReaderOrErr.getError()));
+    Reader = std::move(ReaderOrErr.get());
+  }
+
+  void testRoundTrip(SampleProfileFormat Format) {
+    createWriter(Format);
+
+    StringRef FooName("_Z3fooi");
+    FunctionSamples FooSamples;
+    FooSamples.addTotalSamples(7711);
+    FooSamples.addHeadSamples(610);
+    FooSamples.addBodySamples(1, 0, 610);
+
+    StringRef BarName("_Z3bari");
+    FunctionSamples BarSamples;
+    BarSamples.addTotalSamples(20301);
+    BarSamples.addHeadSamples(1437);
+    BarSamples.addBodySamples(1, 0, 1437);
+
+    StringMap<FunctionSamples> Profiles;
+    Profiles[FooName] = std::move(FooSamples);
+    Profiles[BarName] = std::move(BarSamples);
+
+    std::error_code EC;
+    EC = Writer->write(Profiles);
+    ASSERT_TRUE(NoError(EC));
+
+    Writer->getOutputStream().flush();
+
+    auto Profile = MemoryBuffer::getMemBufferCopy(Data);
+    readProfile(Profile);
+
+    EC = Reader->read();
+    ASSERT_TRUE(NoError(EC));
+
+    StringMap<FunctionSamples> &ReadProfiles = Reader->getProfiles();
+    ASSERT_EQ(2u, ReadProfiles.size());
+
+    FunctionSamples &ReadFooSamples = ReadProfiles[FooName];
+    ASSERT_EQ(7711u, ReadFooSamples.getTotalSamples());
+    ASSERT_EQ(610u, ReadFooSamples.getHeadSamples());
+
+    FunctionSamples &ReadBarSamples = ReadProfiles[BarName];
+    ASSERT_EQ(20301u, ReadBarSamples.getTotalSamples());
+    ASSERT_EQ(1437u, ReadBarSamples.getHeadSamples());
+  }
+};
+
+TEST_F(SampleProfTest, roundtrip_text_profile) {
+  testRoundTrip(SampleProfileFormat::SPF_Text);
+}
+
+TEST_F(SampleProfTest, roundtrip_binary_profile) {
+  testRoundTrip(SampleProfileFormat::SPF_Binary);
+}
+
+} // end anonymous namespace