IVGCVSW-6310 Update ICustomAllocator and add GetDefaultAllocator function to backends

Signed-off-by: Francis Murtagh <francis.murtagh@arm.com>
Change-Id: If2879e8a82692285e7fa3f4d09abd608ca28de12

1 files changed, 45 insertions, 0 deletions

diff --git a/src/backends/backendsCommon/DefaultAllocator.hpp b/src/backends/backendsCommon/DefaultAllocator.hpp
new file mode 100644
index 0000000000..2451db3ab8
--- /dev/null
+++ b/src/backends/backendsCommon/DefaultAllocator.hpp
@@ -0,0 +1,45 @@
+//
+// Copyright © 2021 Arm Ltd and Contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+
+#pragma once
+
+#include <cstddef>
+#include <memory>
+#include <armnn/MemorySources.hpp>
+#include <armnn/utility/IgnoreUnused.hpp>
+
+namespace armnn
+{
+
+/** Default Memory Allocator class returned from IBackendInternal::GetDefaultAllocator(MemorySource) */
+class DefaultAllocator : public armnn::ICustomAllocator
+{
+public:
+    DefaultAllocator() = default;
+
+    void* allocate(size_t size, size_t alignment = 0) override
+    {
+        IgnoreUnused(alignment);
+        return ::operator new(size);
+    }
+
+    void free(void* ptr) override
+    {
+        std::free(ptr);
+    }
+
+    armnn::MemorySource GetMemorySourceType() override
+    {
+        return armnn::MemorySource::Malloc;
+    }
+
+    void* GetMemoryRegionAtOffset(void* buffer, size_t offset, size_t alignment = 0) override
+    {
+        IgnoreUnused(alignment);
+        return static_cast<char*>(buffer) + offset;
+    }
+};
+
+} // namespace armnn
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