Remove nullptr comments and fix relative path for libraries

Signed-off-by: Shreyas Atre <[email protected]>

Author: SAtacker

lib/Interpreter/Paths.cpp

@@ -107,12 +107,12 @@ namespace platform {
   }
 
 #if defined(_WIN32)
-  void* DLOpen(const std::string& Path, std::string& Err /* = nullptr */) {
+  void* DLOpen(const std::string& Path, std::string& Err) {
     auto lib = llvm::sys::DynamicLibrary::getLibrary(Path.c_str(), &Err);
     return lib.getOSSpecificHandle();
   }
 
-  void DLClose(void* Lib, std::string& Err /* = nullptr*/) {
+  void DLClose(void* Lib, std::string& Err) {
     auto dl = llvm::sys::DynamicLibrary(Lib);
     llvm::sys::DynamicLibrary::closeLibrary(dl);
     if (Err.empty()) {
@@ -121,19 +121,20 @@ namespace platform {
   }
 #else
   static void DLErr(std::string& Err) {
-    if (Err.empty())
-      return;
     if (const char* DyLibError = ::dlerror())
       Err = std::string(DyLibError);
   }
 
-  void* DLOpen(const std::string& Path, std::string& Err /* = nullptr */) {
+  void* DLOpen(const std::string& Path, std::string& Err) {
     void* Lib = ::dlopen(Path.c_str(), RTLD_LAZY | RTLD_GLOBAL);
-    DLErr(Err);
+    if (Lib == nullptr) {
+      DLErr(Err);
+      return nullptr;
+    }
     return Lib;
   }
 
-  void DLClose(void* Lib, std::string& Err /* = nullptr*/) {
+  void DLClose(void* Lib, std::string& Err) {
     ::dlclose(Lib);
     DLErr(Err);
   }

unittests/CppInterOp/DynamicLibraryManagerTest.cpp

@@ -61,13 +61,16 @@ TEST(UtilsPlatform, DLTest) {
   std::string err = "";
 #if defined(__APPLE__)
   auto dlopen_handle = Cpp::utils::platform::DLOpen(
-      "./unittests/CppInterOp/libTestSharedLib.dylib", err);
+      "./libTestSharedLib.dylib", err);
 #elif defined(_WIN32)
   auto dlopen_handle = Cpp::utils::platform::DLOpen(
-      "./unittests/CppInterOp/libTestSharedLib.dll", err);
+      "./libTestSharedLib.dll", err);
 #else
   auto dlopen_handle = Cpp::utils::platform::DLOpen(
-      "./unittests/CppInterOp/libTestSharedLib.so", err);
+      "./libTestSharedLib.so", err);
 #endif
-  (void)dlopen_handle;
+  EXPECT_TRUE(dlopen_handle);
+  EXPECT_TRUE(err.empty());
+  Cpp::utils::platform::DLOpen("missing", err);
+  EXPECT_TRUE(err.find("no such file") != std::string::npos);
 }