Add a unit test for loading an object file via a file descriptor. Patch by Pete Cooper.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197600 91177308-0d34-0410-b5e6-96231b3b80d8

unittests/ArchiveFileDescriptor/ArchiveFileDescriptor.cpp

@@ -0,0 +1,53 @@
+//===- llvm/unittest/ArchiveFileDescriptor/ArchiveFileDescriptor.cpp ------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Object/Archive.h"
+#include "llvm/Object/ObjectFile.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "gtest/gtest.h"
+
+using namespace llvm;
+using namespace llvm::object;
+
+static void failIfError(error_code EC) {
+  if (!EC)
+    return;
+
+  errs() << "ERROR: " << EC.message() << "\n";
+  exit(1);
+}
+
+TEST(ArchiveFileDescriptor, Test1) {
+  int FD;
+
+  error_code EC = sys::fs::openFileForRead("ArchiveFileDescriptor", FD);
+  failIfError(EC);
+
+  OwningPtr<MemoryBuffer> MemoryBuffer;
+  EC = MemoryBuffer::getOpenFile(FD, "Dummy Filename",
+                                 MemoryBuffer,
+                                 /* FileSize */ -1,
+                                 /* RequiresNullTerminator */ false);
+  failIfError(EC);
+
+  // Attempt to open the binary.
+  OwningPtr<Binary> Binary;
+  EC = createBinary(MemoryBuffer.take(), Binary);
+  failIfError(EC);
+
+  if (Archive *Arc = dyn_cast<Archive>(Binary.get())) {
+    (void)Arc;
+    errs() << "ERROR: Loaded archive, was expecting object file\n";
+  } else if (ObjectFile *Obj = dyn_cast<ObjectFile>(Binary.get())) {
+    (void)Obj;
+  } else {
+    outs() << "ERROR: Unknown file type\n";
+    exit(1);
+  }
+}