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/*
* Copyright (C) 2012-2018 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 "ArrayStorage.h"
#include "Butterfly.h"
#include "JSObject.h"
#include "Structure.h"
#include "VM.h"
namespace JSC {
template<typename T>
const typename ContiguousData<T>::Data ContiguousData<T>::at(const JSCell* owner, size_t index) const
{
ASSERT(index < m_length);
return Data(m_data[index], owner->indexingMode());
}
template<typename T>
typename ContiguousData<T>::Data ContiguousData<T>::at(const JSCell* owner, size_t index)
{
ASSERT(index < m_length);
return Data(m_data[index], owner->indexingMode());
}
ALWAYS_INLINE unsigned Butterfly::availableContiguousVectorLength(size_t propertyCapacity, unsigned vectorLength)
{
size_t cellSize = totalSize(0, propertyCapacity, true, sizeof(EncodedJSValue) * vectorLength);
cellSize = MarkedSpace::optimalSizeFor(cellSize);
vectorLength = (cellSize - totalSize(0, propertyCapacity, true, 0)) / sizeof(EncodedJSValue);
return vectorLength;
}
ALWAYS_INLINE unsigned Butterfly::availableContiguousVectorLength(Structure* structure, unsigned vectorLength)
{
return availableContiguousVectorLength(structure ? structure->outOfLineCapacity() : 0, vectorLength);
}
ALWAYS_INLINE unsigned Butterfly::optimalContiguousVectorLength(size_t propertyCapacity, unsigned vectorLength)
{
if (!vectorLength)
vectorLength = BASE_CONTIGUOUS_VECTOR_LEN_EMPTY;
else
vectorLength = std::max(BASE_CONTIGUOUS_VECTOR_LEN, vectorLength);
return availableContiguousVectorLength(propertyCapacity, vectorLength);
}
ALWAYS_INLINE unsigned Butterfly::optimalContiguousVectorLength(Structure* structure, unsigned vectorLength)
{
return optimalContiguousVectorLength(structure ? structure->outOfLineCapacity() : 0, vectorLength);
}
inline Butterfly* Butterfly::tryCreateUninitialized(VM& vm, JSObject*, size_t preCapacity, size_t propertyCapacity, bool hasIndexingHeader, size_t indexingPayloadSizeInBytes, GCDeferralContext* deferralContext)
{
size_t size = totalSize(preCapacity, propertyCapacity, hasIndexingHeader, indexingPayloadSizeInBytes);
void* base = vm.jsValueGigacageAuxiliarySpace.allocateNonVirtual(vm, size, deferralContext, AllocationFailureMode::ReturnNull);
if (UNLIKELY(!base))
return nullptr;
Butterfly* result = fromBase(base, preCapacity, propertyCapacity);
return result;
}
inline Butterfly* Butterfly::createUninitialized(VM& vm, JSObject*, size_t preCapacity, size_t propertyCapacity, bool hasIndexingHeader, size_t indexingPayloadSizeInBytes)
{
size_t size = totalSize(preCapacity, propertyCapacity, hasIndexingHeader, indexingPayloadSizeInBytes);
void* base = vm.jsValueGigacageAuxiliarySpace.allocateNonVirtual(vm, size, nullptr, AllocationFailureMode::Assert);
Butterfly* result = fromBase(base, preCapacity, propertyCapacity);
return result;
}
inline Butterfly* Butterfly::tryCreate(VM& vm, JSObject*, size_t preCapacity, size_t propertyCapacity, bool hasIndexingHeader, const IndexingHeader& indexingHeader, size_t indexingPayloadSizeInBytes)
{
size_t size = totalSize(preCapacity, propertyCapacity, hasIndexingHeader, indexingPayloadSizeInBytes);
void* base = vm.jsValueGigacageAuxiliarySpace.allocateNonVirtual(vm, size, nullptr, AllocationFailureMode::ReturnNull);
if (!base)
return nullptr;
Butterfly* result = fromBase(base, preCapacity, propertyCapacity);
if (hasIndexingHeader)
*result->indexingHeader() = indexingHeader;
memset(result->propertyStorage() - propertyCapacity, 0, propertyCapacity * sizeof(EncodedJSValue));
return result;
}
inline Butterfly* Butterfly::create(VM& vm, JSObject* intendedOwner, size_t preCapacity, size_t propertyCapacity, bool hasIndexingHeader, const IndexingHeader& indexingHeader, size_t indexingPayloadSizeInBytes)
{
Butterfly* result = tryCreate(vm, intendedOwner, preCapacity, propertyCapacity, hasIndexingHeader, indexingHeader, indexingPayloadSizeInBytes);
RELEASE_ASSERT(result);
return result;
}
inline Butterfly* Butterfly::create(VM& vm, JSObject* intendedOwner, Structure* structure)
{
return create(
vm, intendedOwner, 0, structure->outOfLineCapacity(),
structure->hasIndexingHeader(intendedOwner), IndexingHeader(), 0);
}
inline void* Butterfly::base(Structure* structure)
{
return base(indexingHeader()->preCapacity(structure), structure->outOfLineCapacity());
}
inline Butterfly* Butterfly::createOrGrowPropertyStorage(
Butterfly* oldButterfly, VM& vm, JSObject* intendedOwner, Structure* structure, size_t oldPropertyCapacity, size_t newPropertyCapacity)
{
RELEASE_ASSERT(newPropertyCapacity > oldPropertyCapacity);
if (!oldButterfly)
return create(vm, intendedOwner, 0, newPropertyCapacity, false, IndexingHeader(), 0);
size_t preCapacity = oldButterfly->indexingHeader()->preCapacity(structure);
size_t indexingPayloadSizeInBytes = oldButterfly->indexingHeader()->indexingPayloadSizeInBytes(structure);
bool hasIndexingHeader = structure->hasIndexingHeader(intendedOwner);
Butterfly* result = createUninitialized(vm, intendedOwner, preCapacity, newPropertyCapacity, hasIndexingHeader, indexingPayloadSizeInBytes);
memcpy(
result->propertyStorage() - oldPropertyCapacity,
oldButterfly->propertyStorage() - oldPropertyCapacity,
totalSize(0, oldPropertyCapacity, hasIndexingHeader, indexingPayloadSizeInBytes));
memset(
result->propertyStorage() - newPropertyCapacity,
0,
(newPropertyCapacity - oldPropertyCapacity) * sizeof(EncodedJSValue));
return result;
}
inline Butterfly* Butterfly::createOrGrowArrayRight(
Butterfly* oldButterfly, VM& vm, JSObject* intendedOwner, Structure* oldStructure,
size_t propertyCapacity, bool hadIndexingHeader, size_t oldIndexingPayloadSizeInBytes,
size_t newIndexingPayloadSizeInBytes)
{
if (!oldButterfly) {
return create(
vm, intendedOwner, 0, propertyCapacity, true, IndexingHeader(),
newIndexingPayloadSizeInBytes);
}
return oldButterfly->growArrayRight(
vm, intendedOwner, oldStructure, propertyCapacity, hadIndexingHeader,
oldIndexingPayloadSizeInBytes, newIndexingPayloadSizeInBytes);
}
inline Butterfly* Butterfly::growArrayRight(
VM& vm, JSObject* intendedOwner, Structure* oldStructure, size_t propertyCapacity,
bool hadIndexingHeader, size_t oldIndexingPayloadSizeInBytes,
size_t newIndexingPayloadSizeInBytes)
{
ASSERT_UNUSED(oldStructure, !indexingHeader()->preCapacity(oldStructure));
ASSERT_UNUSED(intendedOwner, hadIndexingHeader == oldStructure->hasIndexingHeader(intendedOwner));
void* theBase = base(0, propertyCapacity);
size_t oldSize = totalSize(0, propertyCapacity, hadIndexingHeader, oldIndexingPayloadSizeInBytes);
size_t newSize = totalSize(0, propertyCapacity, true, newIndexingPayloadSizeInBytes);
void* newBase = vm.jsValueGigacageAuxiliarySpace.allocateNonVirtual(vm, newSize, nullptr, AllocationFailureMode::ReturnNull);
if (!newBase)
return nullptr;
// FIXME: This probably shouldn't be a memcpy.
memcpy(newBase, theBase, oldSize);
return fromBase(newBase, 0, propertyCapacity);
}
inline Butterfly* Butterfly::growArrayRight(
VM& vm, JSObject* intendedOwner, Structure* oldStructure,
size_t newIndexingPayloadSizeInBytes)
{
return growArrayRight(
vm, intendedOwner, oldStructure, oldStructure->outOfLineCapacity(),
oldStructure->hasIndexingHeader(intendedOwner),
indexingHeader()->indexingPayloadSizeInBytes(oldStructure),
newIndexingPayloadSizeInBytes);
}
inline Butterfly* Butterfly::reallocArrayRightIfPossible(
VM& vm, GCDeferralContext& deferralContext, JSObject* intendedOwner, Structure* oldStructure, size_t propertyCapacity,
bool hadIndexingHeader, size_t oldIndexingPayloadSizeInBytes,
size_t newIndexingPayloadSizeInBytes)
{
ASSERT_UNUSED(oldStructure, !indexingHeader()->preCapacity(oldStructure));
ASSERT_UNUSED(intendedOwner, hadIndexingHeader == oldStructure->hasIndexingHeader(intendedOwner));
void* theBase = base(0, propertyCapacity);
size_t oldSize = totalSize(0, propertyCapacity, hadIndexingHeader, oldIndexingPayloadSizeInBytes);
size_t newSize = totalSize(0, propertyCapacity, true, newIndexingPayloadSizeInBytes);
ASSERT(newSize >= oldSize);
// We can eagerly destroy butterfly backed by LargeAllocation if (1) concurrent collector is not active and (2) the butterfly does not contain any property storage.
// This is because during deallocation concurrent collector can access butterfly and DFG concurrent compilers accesses properties.
// Objects with no properties are common in arrays, and we are focusing on very large array crafted by repeating Array#push, so... that's fine!
bool canRealloc = !propertyCapacity && !vm.heap.mutatorShouldBeFenced() && bitwise_cast<HeapCell*>(theBase)->isLargeAllocation();
if (canRealloc) {
void* newBase = vm.jsValueGigacageAuxiliarySpace.reallocateLargeAllocationNonVirtual(vm, bitwise_cast<HeapCell*>(theBase), newSize, &deferralContext, AllocationFailureMode::ReturnNull);
if (!newBase)
return nullptr;
return fromBase(newBase, 0, propertyCapacity);
}
void* newBase = vm.jsValueGigacageAuxiliarySpace.allocateNonVirtual(vm, newSize, &deferralContext, AllocationFailureMode::ReturnNull);
if (!newBase)
return nullptr;
memcpy(newBase, theBase, oldSize);
return fromBase(newBase, 0, propertyCapacity);
}
inline Butterfly* Butterfly::resizeArray(
VM& vm, JSObject* intendedOwner, size_t propertyCapacity, bool oldHasIndexingHeader,
size_t oldIndexingPayloadSizeInBytes, size_t newPreCapacity, bool newHasIndexingHeader,
size_t newIndexingPayloadSizeInBytes)
{
Butterfly* result = createUninitialized(vm, intendedOwner, newPreCapacity, propertyCapacity, newHasIndexingHeader, newIndexingPayloadSizeInBytes);
// FIXME: This could be made much more efficient if we used the property size,
// not the capacity.
void* to = result->propertyStorage() - propertyCapacity;
void* from = propertyStorage() - propertyCapacity;
size_t size = std::min(
totalSize(0, propertyCapacity, oldHasIndexingHeader, oldIndexingPayloadSizeInBytes),
totalSize(0, propertyCapacity, newHasIndexingHeader, newIndexingPayloadSizeInBytes));
memcpy(to, from, size);
return result;
}
inline Butterfly* Butterfly::resizeArray(
VM& vm, JSObject* intendedOwner, Structure* structure, size_t newPreCapacity,
size_t newIndexingPayloadSizeInBytes)
{
bool hasIndexingHeader = structure->hasIndexingHeader(intendedOwner);
return resizeArray(
vm, intendedOwner, structure->outOfLineCapacity(), hasIndexingHeader,
indexingHeader()->indexingPayloadSizeInBytes(structure), newPreCapacity,
hasIndexingHeader, newIndexingPayloadSizeInBytes);
}
inline Butterfly* Butterfly::unshift(Structure* structure, size_t numberOfSlots)
{
ASSERT(hasAnyArrayStorage(structure->indexingType()));
ASSERT(numberOfSlots <= indexingHeader()->preCapacity(structure));
unsigned propertyCapacity = structure->outOfLineCapacity();
// FIXME: It would probably be wise to rewrite this as a loop since (1) we know in which
// direction we're moving memory so we don't need the extra check of memmove and (2) we're
// moving a small amount of memory in the common case so the throughput of memmove won't
// amortize the overhead of calling it. And no, we cannot rely on the C++ compiler to
// inline memmove (particularly since the size argument is likely to be variable), nor can
// we rely on the compiler to recognize the ordering of the pointer arguments (since
// propertyCapacity is variable and could cause wrap-around as far as the compiler knows).
memmove(
propertyStorage() - numberOfSlots - propertyCapacity,
propertyStorage() - propertyCapacity,
sizeof(EncodedJSValue) * propertyCapacity + sizeof(IndexingHeader) + ArrayStorage::sizeFor(0));
return IndexingHeader::fromEndOf(propertyStorage() - numberOfSlots)->butterfly();
}
inline Butterfly* Butterfly::shift(Structure* structure, size_t numberOfSlots)
{
ASSERT(hasAnyArrayStorage(structure->indexingType()));
unsigned propertyCapacity = structure->outOfLineCapacity();
// FIXME: See comment in unshift(), above.
memmove(
propertyStorage() - propertyCapacity + numberOfSlots,
propertyStorage() - propertyCapacity,
sizeof(EncodedJSValue) * propertyCapacity + sizeof(IndexingHeader) + ArrayStorage::sizeFor(0));
return IndexingHeader::fromEndOf(propertyStorage() + numberOfSlots)->butterfly();
}
} // namespace JSC