IVGCVSW-6077 Add the Custom Memory Allocator interface definition

 * Added ICustomAllocator.hpp to include/armnn/backends/
 * Added the ability to specify an ICustomAllocator to the CreationOptions


Signed-off-by: David Monahan <david.monahan@arm.com>
Change-Id: I820e468b691aa032c9bd2c1e1257dc9d02f981d9

1 files changed, 35 insertions, 0 deletions

diff --git a/include/armnn/backends/ICustomAllocator.hpp b/include/armnn/backends/ICustomAllocator.hpp
new file mode 100644
index 0000000000..1d4df0cb86
--- /dev/null
+++ b/include/armnn/backends/ICustomAllocator.hpp
@@ -0,0 +1,35 @@
+//
+// Copyright © 2021 Arm Ltd and Contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+
+#pragma once
+
+#include <cstddef>
+#include <memory>
+
+namespace armnn
+{
+/** Custom Allocator interface */
+class ICustomAllocator
+{
+public:
+    /** Default virtual destructor. */
+    virtual ~ICustomAllocator() = default;
+
+    /** Interface to be implemented by the child class to allocate bytes
+     *
+     * @param[in] size      Size to allocate
+     * @param[in] alignment Alignment that the returned pointer should comply with
+     *
+     * @return A pointer to the allocated memory
+     */
+    virtual void *allocate(size_t size, size_t alignment) = 0;
+    /** Interface to be implemented by the child class to free the allocated tensor */
+    virtual void free(void *ptr) = 0;
+
+    // Utility Function to define the Custom Memory Allocators capabilities
+    virtual bool SupportsProtectedMemory() = 0;
+
+};
+} // namespace armnn
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