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/*
* Copyright (C) 2011 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_RUNTIME_GC_SPACE_DLMALLOC_SPACE_H_
#define ART_RUNTIME_GC_SPACE_DLMALLOC_SPACE_H_
#include "gc/allocator/dlmalloc.h"
#include "malloc_space.h"
#include "space.h"
namespace art {
namespace gc {
namespace collector {
class MarkSweep;
} // namespace collector
namespace space {
// An alloc space is a space where objects may be allocated and garbage collected.
class DlMallocSpace : public MallocSpace {
public:
// Create a DlMallocSpace from an existing mem_map.
static DlMallocSpace* CreateFromMemMap(MemMap* mem_map, const std::string& name,
size_t starting_size, size_t initial_size,
size_t growth_limit, size_t capacity);
// Create a DlMallocSpace with the requested sizes. The requested
// base address is not guaranteed to be granted, if it is required,
// the caller should call Begin on the returned space to confirm the
// request was granted.
static DlMallocSpace* Create(const std::string& name, size_t initial_size, size_t growth_limit,
size_t capacity, byte* requested_begin);
virtual mirror::Object* AllocWithGrowth(Thread* self, size_t num_bytes,
size_t* bytes_allocated) LOCKS_EXCLUDED(lock_);
virtual mirror::Object* Alloc(Thread* self, size_t num_bytes, size_t* bytes_allocated);
virtual size_t AllocationSize(mirror::Object* obj);
virtual size_t Free(Thread* self, mirror::Object* ptr)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
virtual size_t FreeList(Thread* self, size_t num_ptrs, mirror::Object** ptrs)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
mirror::Object* AllocNonvirtual(Thread* self, size_t num_bytes, size_t* bytes_allocated);
size_t AllocationSizeNonvirtual(mirror::Object* obj) {
void* obj_ptr = const_cast<void*>(reinterpret_cast<const void*>(obj));
return mspace_usable_size(obj_ptr) + kChunkOverhead;
}
#ifndef NDEBUG
// Override only in the debug build.
void CheckMoreCoreForPrecondition();
#endif
void* GetMspace() const {
return mspace_;
}
size_t Trim();
// Perform a mspace_inspect_all which calls back for each allocation chunk. The chunk may not be
// in use, indicated by num_bytes equaling zero.
void Walk(WalkCallback callback, void* arg) LOCKS_EXCLUDED(lock_);
// Returns the number of bytes that the space has currently obtained from the system. This is
// greater or equal to the amount of live data in the space.
size_t GetFootprint();
// Returns the number of bytes that the heap is allowed to obtain from the system via MoreCore.
size_t GetFootprintLimit();
// Set the maximum number of bytes that the heap is allowed to obtain from the system via
// MoreCore. Note this is used to stop the mspace growing beyond the limit to Capacity. When
// allocations fail we GC before increasing the footprint limit and allowing the mspace to grow.
void SetFootprintLimit(size_t limit);
MallocSpace* CreateInstance(const std::string& name, MemMap* mem_map, void* allocator,
byte* begin, byte* end, byte* limit, size_t growth_limit);
uint64_t GetBytesAllocated();
uint64_t GetObjectsAllocated();
// Returns the class of a recently freed object.
mirror::Class* FindRecentFreedObject(const mirror::Object* obj);
virtual void Clear();
virtual bool IsDlMallocSpace() const {
return true;
}
virtual DlMallocSpace* AsDlMallocSpace() {
return this;
}
protected:
DlMallocSpace(const std::string& name, MemMap* mem_map, void* mspace, byte* begin, byte* end,
byte* limit, size_t growth_limit);
private:
mirror::Object* AllocWithoutGrowthLocked(Thread* self, size_t num_bytes, size_t* bytes_allocated)
EXCLUSIVE_LOCKS_REQUIRED(lock_);
void* CreateAllocator(void* base, size_t morecore_start, size_t initial_size, bool /*low_memory_mode*/) {
return CreateMspace(base, morecore_start, initial_size);
}
static void* CreateMspace(void* base, size_t morecore_start, size_t initial_size);
// The boundary tag overhead.
static const size_t kChunkOverhead = kWordSize;
// Underlying malloc space
void* const mspace_;
// A mspace pointer used for allocation. Equals to what mspace_
// points to or nullptr after InvalidateAllocator() is called.
void* mspace_for_alloc_;
friend class collector::MarkSweep;
DISALLOW_COPY_AND_ASSIGN(DlMallocSpace);
};
} // namespace space
} // namespace gc
} // namespace art
#endif // ART_RUNTIME_GC_SPACE_DLMALLOC_SPACE_H_
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