| /* |
| * Copyright (C) 2014, 2015 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. |
| */ |
| |
| #include "config.h" |
| #include "PolymorphicGetByIdList.h" |
| |
| #if ENABLE(JIT) |
| |
| #include "CodeBlock.h" |
| #include "Heap.h" |
| #include "JSCInlines.h" |
| #include "StructureStubInfo.h" |
| |
| namespace JSC { |
| |
| GetByIdAccess::GetByIdAccess( |
| VM& vm, JSCell* owner, AccessType type, PassRefPtr<JITStubRoutine> stubRoutine, |
| Structure* structure, const ObjectPropertyConditionSet& conditionSet) |
| : m_type(type) |
| , m_structure(vm, owner, structure) |
| , m_conditionSet(conditionSet) |
| , m_stubRoutine(stubRoutine) |
| { |
| } |
| |
| GetByIdAccess::~GetByIdAccess() |
| { |
| } |
| |
| GetByIdAccess GetByIdAccess::fromStructureStubInfo(StructureStubInfo& stubInfo) |
| { |
| MacroAssemblerCodePtr initialSlowPath = |
| stubInfo.callReturnLocation.labelAtOffset(stubInfo.patch.deltaCallToSlowCase); |
| |
| GetByIdAccess result; |
| |
| RELEASE_ASSERT(stubInfo.accessType == access_get_by_id_self); |
| |
| result.m_type = SimpleInline; |
| result.m_structure.copyFrom(stubInfo.u.getByIdSelf.baseObjectStructure); |
| result.m_stubRoutine = JITStubRoutine::createSelfManagedRoutine(initialSlowPath); |
| |
| return result; |
| } |
| |
| bool GetByIdAccess::visitWeak(RepatchBuffer& repatchBuffer) const |
| { |
| if (m_structure && !Heap::isMarked(m_structure.get())) |
| return false; |
| if (!m_conditionSet.areStillLive()) |
| return false; |
| if (!m_stubRoutine->visitWeak(repatchBuffer)) |
| return false; |
| return true; |
| } |
| |
| PolymorphicGetByIdList::PolymorphicGetByIdList(StructureStubInfo& stubInfo) |
| { |
| if (stubInfo.accessType == access_unset) |
| return; |
| |
| m_list.append(GetByIdAccess::fromStructureStubInfo(stubInfo)); |
| } |
| |
| PolymorphicGetByIdList* PolymorphicGetByIdList::from(StructureStubInfo& stubInfo) |
| { |
| if (stubInfo.accessType == access_get_by_id_list) |
| return stubInfo.u.getByIdList.list; |
| |
| ASSERT( |
| stubInfo.accessType == access_get_by_id_self |
| || stubInfo.accessType == access_unset); |
| |
| PolymorphicGetByIdList* result = new PolymorphicGetByIdList(stubInfo); |
| |
| stubInfo.initGetByIdList(result); |
| |
| return result; |
| } |
| |
| PolymorphicGetByIdList::~PolymorphicGetByIdList() { } |
| |
| MacroAssemblerCodePtr PolymorphicGetByIdList::currentSlowPathTarget( |
| StructureStubInfo& stubInfo) const |
| { |
| if (isEmpty()) |
| return stubInfo.callReturnLocation.labelAtOffset(stubInfo.patch.deltaCallToSlowCase); |
| return m_list.last().stubRoutine()->code().code(); |
| } |
| |
| void PolymorphicGetByIdList::addAccess(const GetByIdAccess& access) |
| { |
| ASSERT(!isFull()); |
| // Make sure that the resizing optimizes for space, not time. |
| m_list.resizeToFit(m_list.size() + 1); |
| m_list.last() = access; |
| } |
| |
| bool PolymorphicGetByIdList::isFull() const |
| { |
| ASSERT(size() <= POLYMORPHIC_LIST_CACHE_SIZE); |
| return size() == POLYMORPHIC_LIST_CACHE_SIZE; |
| } |
| |
| bool PolymorphicGetByIdList::isAlmostFull() const |
| { |
| ASSERT(size() <= POLYMORPHIC_LIST_CACHE_SIZE); |
| return size() >= POLYMORPHIC_LIST_CACHE_SIZE - 1; |
| } |
| |
| bool PolymorphicGetByIdList::didSelfPatching() const |
| { |
| for (unsigned i = size(); i--;) { |
| if (at(i).type() == GetByIdAccess::SimpleInline) |
| return true; |
| } |
| return false; |
| } |
| |
| bool PolymorphicGetByIdList::visitWeak(RepatchBuffer& repatchBuffer) const |
| { |
| for (unsigned i = size(); i--;) { |
| if (!at(i).visitWeak(repatchBuffer)) |
| return false; |
| } |
| return true; |
| } |
| |
| } // namespace JSC |
| |
| #endif // ENABLE(JIT) |
| |
| |