IVGCVSW-3563 + IVGCVSW-3555 Create new utility functions for dynamic backends

 * Created new DynamicBackendUtils class
 * Added OpenHandle, CloseHandle, GetEntryPoint and GetDlError methods to it

Signed-off-by: Matteo Martincigh <matteo.martincigh@arm.com>
Change-Id: I88c683b2c5d37968a9ebdf335be932ae2d9061e5

1 files changed, 48 insertions, 0 deletions

diff --git a/src/backends/backendsCommon/DynamicBackendUtils.cpp b/src/backends/backendsCommon/DynamicBackendUtils.cpp
new file mode 100644
index 0000000000..f5ee12cbfd
--- /dev/null
+++ b/src/backends/backendsCommon/DynamicBackendUtils.cpp
@@ -0,0 +1,48 @@
+//
+// Copyright © 2017 Arm Ltd. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+
+#include "DynamicBackendUtils.hpp"
+
+namespace armnn
+{
+
+void* DynamicBackendUtils::OpenHandle(const std::string& sharedObjectPath)
+{
+    if (sharedObjectPath.empty())
+    {
+        throw RuntimeException("OpenHandle error: shared object path must not be empty");
+    }
+
+    void* sharedObjectHandle = dlopen(sharedObjectPath.c_str(), RTLD_LAZY | RTLD_GLOBAL);
+    if (!sharedObjectHandle)
+    {
+        throw RuntimeException(boost::str(boost::format("OpenHandle error: %1") % GetDlError()));
+    }
+
+    return sharedObjectHandle;
+}
+
+void DynamicBackendUtils::CloseHandle(const void* sharedObjectHandle)
+{
+    if (!sharedObjectHandle)
+    {
+        return;
+    }
+
+    dlclose(const_cast<void*>(sharedObjectHandle));
+}
+
+std::string DynamicBackendUtils::GetDlError()
+{
+    const char* errorMessage = dlerror();
+    if (!errorMessage)
+    {
+        return "";
+    }
+
+    return std::string(errorMessage);
+}
+
+} // namespace armnn