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CompleteSubspace.h
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87 lines (72 loc) · 3.73 KB
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/*
* Copyright (C) 2017-2018 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "Subspace.h"
namespace JSC {
class CompleteSubspace final : public Subspace {
public:
JS_EXPORT_PRIVATE CompleteSubspace(CString name, Heap&, HeapCellType*, AlignedMemoryAllocator*);
JS_EXPORT_PRIVATE ~CompleteSubspace() final;
// In some code paths, we need it to be a compile error to call the virtual version of one of
// these functions. That's why we do final methods the old school way.
// FIXME: Currently subspaces speak of BlockDirectories as "allocators", but that's temporary.
// https://bugs.webkit.org/show_bug.cgi?id=181559
Allocator allocatorFor(size_t, AllocatorForMode) final;
Allocator allocatorForNonVirtual(size_t, AllocatorForMode);
void* allocate(VM&, size_t, GCDeferralContext*, AllocationFailureMode) final;
void* allocateNonVirtual(VM&, size_t, GCDeferralContext*, AllocationFailureMode);
void* reallocatePreciseAllocationNonVirtual(VM&, HeapCell*, size_t, GCDeferralContext*, AllocationFailureMode);
static ptrdiff_t offsetOfAllocatorForSizeStep() { return OBJECT_OFFSETOF(CompleteSubspace, m_allocatorForSizeStep); }
Allocator* allocatorForSizeStep() { return &m_allocatorForSizeStep[0]; }
private:
JS_EXPORT_PRIVATE Allocator allocatorForSlow(size_t);
// These slow paths are concerned with large allocations and allocator creation.
JS_EXPORT_PRIVATE void* allocateSlow(VM&, size_t, GCDeferralContext*, AllocationFailureMode);
void* tryAllocateSlow(VM&, size_t, GCDeferralContext*);
std::array<Allocator, MarkedSpace::numSizeClasses> m_allocatorForSizeStep;
Vector<std::unique_ptr<BlockDirectory>> m_directories;
Vector<std::unique_ptr<LocalAllocator>> m_localAllocators;
};
ALWAYS_INLINE Allocator CompleteSubspace::allocatorForNonVirtual(size_t size, AllocatorForMode mode)
{
if (size <= MarkedSpace::largeCutoff) {
Allocator result = m_allocatorForSizeStep[MarkedSpace::sizeClassToIndex(size)];
switch (mode) {
case AllocatorForMode::MustAlreadyHaveAllocator:
RELEASE_ASSERT(result);
break;
case AllocatorForMode::EnsureAllocator:
if (!result)
return allocatorForSlow(size);
break;
case AllocatorForMode::AllocatorIfExists:
break;
}
return result;
}
RELEASE_ASSERT(mode != AllocatorForMode::MustAlreadyHaveAllocator);
return Allocator();
}
} // namespace JSC