#pragma once
#include "MarkedBlock.h"
#include "MarkedSpace.h"
#include <wtf/text/CString.h>
namespace JSC {
class Subspace {
WTF_MAKE_NONCOPYABLE(Subspace);
WTF_MAKE_FAST_ALLOCATED;
public:
JS_EXPORT_PRIVATE Subspace(CString name, Heap&, AllocatorAttributes);
JS_EXPORT_PRIVATE virtual ~Subspace();
const char *name() const { return m_name.data(); }
MarkedSpace& space() const { return m_space; }
const AllocatorAttributes& attributes() const { return m_attributes; }
virtual void finishSweep(MarkedBlock::Handle&, FreeList*);
virtual void destroy(VM&, JSCell*);
MarkedAllocator* tryAllocatorFor(size_t);
MarkedAllocator* allocatorFor(size_t);
JS_EXPORT_PRIVATE void* allocate(size_t);
JS_EXPORT_PRIVATE void* allocate(GCDeferralContext*, size_t);
JS_EXPORT_PRIVATE void* tryAllocate(size_t);
JS_EXPORT_PRIVATE void* tryAllocate(GCDeferralContext*, size_t);
template<typename Func>
void forEachMarkedBlock(const Func&);
template<typename Func>
void forEachNotEmptyMarkedBlock(const Func&);
template<typename Func>
void forEachLargeAllocation(const Func&);
template<typename Func>
void forEachMarkedCell(const Func&);
template<typename Func>
void forEachLiveCell(const Func&);
static ptrdiff_t offsetOfAllocatorForSizeStep() { return OBJECT_OFFSETOF(Subspace, m_allocatorForSizeStep); }
MarkedAllocator** allocatorForSizeStep() { return &m_allocatorForSizeStep[0]; }
private:
MarkedAllocator* allocatorForSlow(size_t);
void* allocateSlow(GCDeferralContext*, size_t);
void* tryAllocateSlow(GCDeferralContext*, size_t);
void didAllocate(void*);
MarkedSpace& m_space;
CString m_name;
AllocatorAttributes m_attributes;
std::array<MarkedAllocator*, MarkedSpace::numSizeClasses> m_allocatorForSizeStep;
MarkedAllocator* m_firstAllocator { nullptr };
SentinelLinkedList<LargeAllocation, BasicRawSentinelNode<LargeAllocation>> m_largeAllocations;
};
ALWAYS_INLINE MarkedAllocator* Subspace::tryAllocatorFor(size_t size)
{
if (size <= MarkedSpace::largeCutoff)
return m_allocatorForSizeStep[MarkedSpace::sizeClassToIndex(size)];
return nullptr;
}
ALWAYS_INLINE MarkedAllocator* Subspace::allocatorFor(size_t size)
{
if (size <= MarkedSpace::largeCutoff) {
if (MarkedAllocator* result = m_allocatorForSizeStep[MarkedSpace::sizeClassToIndex(size)])
return result;
return allocatorForSlow(size);
}
return nullptr;
}
}