COMPMID-793 : Add graph intermediate representation

Change-Id: Ic1685de4e19e0ac79669ef2da64e1dc96c7ea0bf
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/115248
Tested-by: Jenkins <bsgcomp@arm.com>
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
diff --git a/src/graph2/backends/BackendRegistry.cpp b/src/graph2/backends/BackendRegistry.cpp
new file mode 100644
index 0000000..5f1218f
--- /dev/null
+++ b/src/graph2/backends/BackendRegistry.cpp
@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2018 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "arm_compute/graph2/backends/BackendRegistry.h"
+
+using namespace arm_compute::graph2::backends;
+
+namespace arm_compute
+{
+namespace graph2
+{
+namespace backends
+{
+BackendRegistry::BackendRegistry()
+    : _registered_backends()
+{
+}
+
+BackendRegistry &BackendRegistry::get()
+{
+    static BackendRegistry instance;
+    return instance;
+}
+
+IDeviceBackend *BackendRegistry::find_backend(Target target)
+{
+    ARM_COMPUTE_ERROR_ON(!contains(target));
+    return _registered_backends[target].get();
+}
+
+bool BackendRegistry::contains(Target target) const
+{
+    auto it = _registered_backends.find(target);
+    return (it != _registered_backends.end());
+}
+
+const std::map<Target, std::unique_ptr<IDeviceBackend>> &BackendRegistry::backends() const
+{
+    return _registered_backends;
+}
+} // namespace backends
+} // namespace graph2
+} // namespace arm_compute