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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ANDROID_ML_NN_RUNTIME_MEMORY_H
#define ANDROID_ML_NN_RUNTIME_MEMORY_H
#include "NeuralNetworks.h"
#include "Utils.h"
#include <cutils/native_handle.h>
#include <sys/mman.h>
#include <unordered_map>
namespace android {
namespace nn {
class ModelBuilder;
// Represents a memory region.
class Memory {
public:
Memory() {}
virtual ~Memory() {}
// Disallow copy semantics to ensure the runtime object can only be freed
// once. Copy semantics could be enabled if some sort of reference counting
// or deep-copy system for runtime objects is added later.
Memory(const Memory&) = delete;
Memory& operator=(const Memory&) = delete;
// Creates a shared memory object of the size specified in bytes.
int create(uint32_t size);
hardware::hidl_memory getHidlMemory() const { return mHidlMemory; }
// Returns a pointer to the underlying memory of this memory object.
virtual int getPointer(uint8_t** buffer) const {
*buffer = static_cast<uint8_t*>(static_cast<void*>(mMemory->getPointer()));
return ANEURALNETWORKS_NO_ERROR;
}
virtual bool validateSize(uint32_t offset, uint32_t length) const;
protected:
// The hidl_memory handle for this shared memory. We will pass this value when
// communicating with the drivers.
hardware::hidl_memory mHidlMemory;
sp<IMemory> mMemory;
};
class MemoryFd : public Memory {
public:
MemoryFd() {}
~MemoryFd();
// Disallow copy semantics to ensure the runtime object can only be freed
// once. Copy semantics could be enabled if some sort of reference counting
// or deep-copy system for runtime objects is added later.
MemoryFd(const MemoryFd&) = delete;
MemoryFd& operator=(const MemoryFd&) = delete;
// Create the native_handle based on input size, prot, and fd.
// Existing native_handle will be deleted, and mHidlMemory will wrap
// the newly created native_handle.
int set(size_t size, int prot, int fd, size_t offset);
int getPointer(uint8_t** buffer) const override;
private:
native_handle_t* mHandle = nullptr;
mutable uint8_t* mMapping = nullptr;
};
// A utility class to accumulate mulitple Memory objects and assign each
// a distinct index number, starting with 0.
//
// The user of this class is responsible for avoiding concurrent calls
// to this class from multiple threads.
class MemoryTracker {
private:
// The vector of Memory pointers we are building.
std::vector<const Memory*> mMemories;
// A faster way to see if we already have a memory than doing find().
std::unordered_map<const Memory*, uint32_t> mKnown;
public:
// Adds the memory, if it does not already exists. Returns its index.
// The memories should survive the tracker.
uint32_t add(const Memory* memory);
// Returns the number of memories contained.
uint32_t size() const { return static_cast<uint32_t>(mKnown.size()); }
// Returns the ith memory.
const Memory* operator[](size_t i) const { return mMemories[i]; }
// Iteration
decltype(mMemories.begin()) begin() { return mMemories.begin(); }
decltype(mMemories.end()) end() { return mMemories.end(); }
};
} // namespace nn
} // namespace android
#endif // ANDROID_ML_NN_RUNTIME_MEMORY_H
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