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/*
* 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)