Add support for unittest inputs.

Occasionally it is useful to have unittest which take inputs.
While we normally try to have this test be more of a lit test
we occasionally don't have tools that can exercise the code
in the right way to test certain things.  LLDB has been using
this style of unit test for a while, particularly with regards
to how it tests core dump and minidump file parsing.  Recently
i needed this as well for the case where we want to test that
some of the PDB reading code works correctly.  It needs to
exercise the code in a way that is not covered by any dumper
and would be impractical to implement in one of the dumpers,
but requires a valid PDB file.  Since this is now needed by
more than one project, it makes sense to have this be a
generally supported thing that unit tests can do, and we just
encourage people to use this sparingly.

Differential Revision: https://reviews.llvm.org/D51561

llvm-svn: 341502

2 files changed, 37 insertions, 0 deletions

diff --git a/llvm/lib/Testing/Support/CMakeLists.txt b/llvm/lib/Testing/Support/CMakeLists.txt
index 969875e55a1..c10a81015c5 100644
--- a/llvm/lib/Testing/Support/CMakeLists.txt
+++ b/llvm/lib/Testing/Support/CMakeLists.txt
@@ -3,6 +3,7 @@ add_definitions(-DGTEST_HAS_TR1_TUPLE=0)
 
 add_llvm_library(LLVMTestingSupport
   Error.cpp
+  SupportHelpers.cpp
 
   BUILDTREE_ONLY
   
diff --git a/llvm/lib/Testing/Support/SupportHelpers.cpp b/llvm/lib/Testing/Support/SupportHelpers.cpp
new file mode 100644
index 00000000000..c26697988ce
--- /dev/null
+++ b/llvm/lib/Testing/Support/SupportHelpers.cpp
@@ -0,0 +1,36 @@
+
+#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;
+
+extern const char *TestMainArgv0;
+
+SmallString<128> llvm::unittest::getInputFileDirectory() {
+  llvm::SmallString<128> Result = llvm::sys::path::parent_path(TestMainArgv0);
+  llvm::sys::fs::make_absolute(Result);
+  llvm::sys::path::append(Result, "llvm.srcdir.txt");
+
+  EXPECT_TRUE(llvm::sys::fs::is_directory(Result))
+      << "Unit test source directory file does not exist.";
+
+  auto File = MemoryBuffer::getFile(Result);
+
+  EXPECT_TRUE(static_cast<bool>(File))
+      << "Could not open unit test source directory file.";
+
+  Result.clear();
+  Result.append((*File)->getBuffer().trim());
+  llvm::sys::path::append(Result, "Inputs");
+  llvm::sys::path::native(Result);
+  return std::move(Result);
+}