mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2025-04-07 09:21:41 +00:00
88 lines
3.7 KiB
C++
88 lines
3.7 KiB
C++
/*
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* Copyright (C) 2017-2018 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "Subspace.h"
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namespace JSC {
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class CompleteSubspace final : public Subspace {
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public:
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JS_EXPORT_PRIVATE CompleteSubspace(CString name, Heap&, HeapCellType*, AlignedMemoryAllocator*);
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JS_EXPORT_PRIVATE ~CompleteSubspace() final;
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// In some code paths, we need it to be a compile error to call the virtual version of one of
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// these functions. That's why we do final methods the old school way.
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// FIXME: Currently subspaces speak of BlockDirectories as "allocators", but that's temporary.
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// https://bugs.webkit.org/show_bug.cgi?id=181559
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Allocator allocatorFor(size_t, AllocatorForMode) final;
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Allocator allocatorForNonVirtual(size_t, AllocatorForMode);
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void* allocate(VM&, size_t, GCDeferralContext*, AllocationFailureMode) final;
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void* allocateNonVirtual(VM&, size_t, GCDeferralContext*, AllocationFailureMode);
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void* reallocatePreciseAllocationNonVirtual(VM&, HeapCell*, size_t, GCDeferralContext*, AllocationFailureMode);
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static ptrdiff_t offsetOfAllocatorForSizeStep() { return OBJECT_OFFSETOF(CompleteSubspace, m_allocatorForSizeStep); }
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Allocator* allocatorForSizeStep() { return &m_allocatorForSizeStep[0]; }
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private:
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JS_EXPORT_PRIVATE Allocator allocatorForSlow(size_t);
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// These slow paths are concerned with large allocations and allocator creation.
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JS_EXPORT_PRIVATE void* allocateSlow(VM&, size_t, GCDeferralContext*, AllocationFailureMode);
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void* tryAllocateSlow(VM&, size_t, GCDeferralContext*);
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std::array<Allocator, MarkedSpace::numSizeClasses> m_allocatorForSizeStep;
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Vector<std::unique_ptr<BlockDirectory>> m_directories;
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Vector<std::unique_ptr<LocalAllocator>> m_localAllocators;
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};
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ALWAYS_INLINE Allocator CompleteSubspace::allocatorForNonVirtual(size_t size, AllocatorForMode mode)
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{
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if (size <= MarkedSpace::largeCutoff) {
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Allocator result = m_allocatorForSizeStep[MarkedSpace::sizeClassToIndex(size)];
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switch (mode) {
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case AllocatorForMode::MustAlreadyHaveAllocator:
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RELEASE_ASSERT(result);
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break;
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case AllocatorForMode::EnsureAllocator:
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if (!result)
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return allocatorForSlow(size);
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break;
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case AllocatorForMode::AllocatorIfExists:
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break;
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}
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return result;
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}
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RELEASE_ASSERT(mode != AllocatorForMode::MustAlreadyHaveAllocator);
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return Allocator();
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}
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} // namespace JSC
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