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/*
* Copyright (C) 2013 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 ART_LIBARTBASE_BASE_ALLOCATOR_H_
#define ART_LIBARTBASE_BASE_ALLOCATOR_H_
#include <type_traits>
#include "atomic.h"
#include "macros.h"
namespace art {
static constexpr bool kEnableTrackingAllocator = false;
class Allocator {
public:
static Allocator* GetMallocAllocator();
static Allocator* GetNoopAllocator();
Allocator() {}
virtual ~Allocator() {}
virtual void* Alloc(size_t) = 0;
virtual void Free(void*) = 0;
private:
DISALLOW_COPY_AND_ASSIGN(Allocator);
};
// Used by TrackedAllocators.
enum AllocatorTag {
kAllocatorTagHeap,
kAllocatorTagMonitorList,
kAllocatorTagClassTable,
kAllocatorTagInternTable,
kAllocatorTagMaps,
kAllocatorTagLOS,
kAllocatorTagSafeMap,
kAllocatorTagLOSMaps,
kAllocatorTagReferenceTable,
kAllocatorTagHeapBitmap,
kAllocatorTagHeapBitmapLOS,
kAllocatorTagMonitorPool,
kAllocatorTagLOSFreeList,
kAllocatorTagVerifier,
kAllocatorTagRememberedSet,
kAllocatorTagModUnionCardSet,
kAllocatorTagModUnionReferenceArray,
kAllocatorTagJNILibraries,
kAllocatorTagCompileTimeClassPath,
kAllocatorTagOatFile,
kAllocatorTagDexFileVerifier,
kAllocatorTagRosAlloc,
kAllocatorTagCount, // Must always be last element.
};
std::ostream& operator<<(std::ostream& os, const AllocatorTag& tag);
namespace TrackedAllocators {
// We use memory_order_relaxed updates of the following counters. Values are treated as approximate
// wherever concurrent updates are possible.
// Running count of number of bytes used for this kind of allocation. Increased by allocations,
// decreased by deallocations.
extern Atomic<size_t> g_bytes_used[kAllocatorTagCount];
// Largest value of bytes used seen.
extern Atomic<size_t> g_max_bytes_used[kAllocatorTagCount];
// Total number of bytes allocated of this kind.
extern Atomic<uint64_t> g_total_bytes_used[kAllocatorTagCount];
void Dump(std::ostream& os);
inline void RegisterAllocation(AllocatorTag tag, size_t bytes) {
g_total_bytes_used[tag].fetch_add(bytes, std::memory_order_relaxed);
size_t new_bytes = g_bytes_used[tag].fetch_add(bytes, std::memory_order_relaxed) + bytes;
size_t max_bytes = g_max_bytes_used[tag].load(std::memory_order_relaxed);
while (max_bytes < new_bytes
&& !g_max_bytes_used[tag].compare_exchange_weak(max_bytes /* updated */, new_bytes,
std::memory_order_relaxed)) {
}
}
inline void RegisterFree(AllocatorTag tag, size_t bytes) {
g_bytes_used[tag].fetch_sub(bytes, std::memory_order_relaxed);
}
} // namespace TrackedAllocators
// Tracking allocator for use with STL types, tracks how much memory is used.
template<class T, AllocatorTag kTag>
class TrackingAllocatorImpl : public std::allocator<T> {
public:
typedef typename std::allocator<T>::value_type value_type;
typedef typename std::allocator<T>::size_type size_type;
typedef typename std::allocator<T>::difference_type difference_type;
typedef typename std::allocator<T>::pointer pointer;
typedef typename std::allocator<T>::const_pointer const_pointer;
typedef typename std::allocator<T>::reference reference;
typedef typename std::allocator<T>::const_reference const_reference;
// Used internally by STL data structures.
template <class U>
TrackingAllocatorImpl(
const TrackingAllocatorImpl<U, kTag>& alloc ATTRIBUTE_UNUSED) noexcept {}
// Used internally by STL data structures.
TrackingAllocatorImpl() noexcept {
static_assert(kTag < kAllocatorTagCount, "kTag must be less than kAllocatorTagCount");
}
// Enables an allocator for objects of one type to allocate storage for objects of another type.
// Used internally by STL data structures.
template <class U>
struct rebind {
typedef TrackingAllocatorImpl<U, kTag> other;
};
pointer allocate(size_type n, const_pointer hint ATTRIBUTE_UNUSED = 0) {
const size_t size = n * sizeof(T);
TrackedAllocators::RegisterAllocation(GetTag(), size);
return reinterpret_cast<pointer>(malloc(size));
}
template <typename PT>
void deallocate(PT p, size_type n) {
const size_t size = n * sizeof(T);
TrackedAllocators::RegisterFree(GetTag(), size);
free(p);
}
static constexpr AllocatorTag GetTag() {
return kTag;
}
};
template<class T, AllocatorTag kTag>
// C++ doesn't allow template typedefs. This is a workaround template typedef which is
// TrackingAllocatorImpl<T> if kEnableTrackingAllocator is true, std::allocator<T> otherwise.
using TrackingAllocator = typename std::conditional<kEnableTrackingAllocator,
TrackingAllocatorImpl<T, kTag>,
std::allocator<T>>::type;
} // namespace art
#endif // ART_LIBARTBASE_BASE_ALLOCATOR_H_
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