1 files changed, 53 insertions, 0 deletions
diff --git a/llvm/lib/Testing/Support/SupportHelpers.cpp b/llvm/lib/Testing/Support/SupportHelpers.cpp
new file mode 100644
index 000000000000..5f53b2330b20
--- /dev/null
+++ b/llvm/lib/Testing/Support/SupportHelpers.cpp
@@ -0,0 +1,53 @@
+
+#include "llvm/Testing/Support/SupportHelpers.h"
+
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/Path.h"
+
+#include "gtest/gtest.h"
+
+using namespace llvm;
+using namespace llvm::unittest;
+
+static std::pair<bool, SmallString<128>> findSrcDirMap(StringRef Argv0) {
+  SmallString<128> BaseDir = llvm::sys::path::parent_path(Argv0);
+
+  llvm::sys::fs::make_absolute(BaseDir);
+
+  SmallString<128> PathInSameDir = BaseDir;
+  llvm::sys::path::append(PathInSameDir, "llvm.srcdir.txt");
+
+  if (llvm::sys::fs::is_regular_file(PathInSameDir))
+    return std::make_pair(true, std::move(PathInSameDir));
+
+  SmallString<128> PathInParentDir = llvm::sys::path::parent_path(BaseDir);
+
+  llvm::sys::path::append(PathInParentDir, "llvm.srcdir.txt");
+  if (llvm::sys::fs::is_regular_file(PathInParentDir))
+    return std::make_pair(true, std::move(PathInParentDir));
+
+  return std::pair<bool, SmallString<128>>(false, {});
+}
+
+SmallString<128> llvm::unittest::getInputFileDirectory(const char *Argv0) {
+  bool Found = false;
+  SmallString<128> InputFilePath;
+  std::tie(Found, InputFilePath) = findSrcDirMap(Argv0);
+
+  EXPECT_TRUE(Found) << "Unit test source directory file does not exist.";
+
+  auto File = MemoryBuffer::getFile(InputFilePath);
+
+  EXPECT_TRUE(static_cast<bool>(File))
+      << "Could not open unit test source directory file.";
+
+  InputFilePath.clear();
+  InputFilePath.append((*File)->getBuffer().trim());
+  llvm::sys::path::append(InputFilePath, "Inputs");
+  llvm::sys::path::native(InputFilePath);
+  return InputFilePath;
+}