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/*
* Copyright (C) 2012-2021 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 "GCAwareJITStubRoutine.h"
#if ENABLE(JIT)
#include "AccessCase.h"
#include "CodeBlock.h"
#include "DFGCommonData.h"
#include "Heap.h"
#include "VM.h"
#include "JITStubRoutineSet.h"
#include "JSCellInlines.h"
#include <wtf/RefPtr.h>
namespace JSC {
GCAwareJITStubRoutine::GCAwareJITStubRoutine(const MacroAssemblerCodeRef<JITStubRoutinePtrTag>& code)
: JITStubRoutine(code)
{
}
GCAwareJITStubRoutine::~GCAwareJITStubRoutine() { }
void GCAwareJITStubRoutine::makeGCAware(VM& vm)
{
vm.heap.m_jitStubRoutines->add(this);
m_isGCAware = true;
}
void GCAwareJITStubRoutine::observeZeroRefCount()
{
if (m_isJettisoned || !m_isGCAware) {
// This case is needed for when the system shuts down. It may be that
// the JIT stub routine set gets deleted before we get around to deleting
// this guy. In that case the GC informs us that we're jettisoned already
// and that we should delete ourselves as soon as the ref count reaches
// zero.
delete this;
return;
}
RELEASE_ASSERT(!m_refCount);
m_isJettisoned = true;
}
void GCAwareJITStubRoutine::deleteFromGC()
{
ASSERT(m_isJettisoned);
ASSERT(!m_refCount);
ASSERT(!m_mayBeExecuting);
delete this;
}
PolymorphicAccessJITStubRoutine::PolymorphicAccessJITStubRoutine(const MacroAssemblerCodeRef<JITStubRoutinePtrTag>& code, VM& vm, FixedVector<RefPtr<AccessCase>>&& cases, FixedVector<StructureID>&& weakStructures)
: GCAwareJITStubRoutine(code)
, m_vm(vm)
, m_cases(WTFMove(cases))
, m_weakStructures(WTFMove(weakStructures))
{
}
void PolymorphicAccessJITStubRoutine::observeZeroRefCount()
{
if (m_vm.m_sharedJITStubs)
m_vm.m_sharedJITStubs->remove(this);
Base::observeZeroRefCount();
}
unsigned PolymorphicAccessJITStubRoutine::computeHash(const FixedVector<RefPtr<AccessCase>>& cases, const FixedVector<StructureID>& weakStructures)
{
Hasher hasher;
for (auto& key : cases)
WTF::add(hasher, key->hash());
for (auto& structureID : weakStructures)
WTF::add(hasher, structureID.bits());
return hasher.hash();
}
MarkingGCAwareJITStubRoutine::MarkingGCAwareJITStubRoutine(
const MacroAssemblerCodeRef<JITStubRoutinePtrTag>& code, VM& vm, FixedVector<RefPtr<AccessCase>>&& cases, FixedVector<StructureID>&& weakStructures, const JSCell* owner,
const Vector<JSCell*>& cells, Bag<OptimizingCallLinkInfo>&& callLinkInfos)
: PolymorphicAccessJITStubRoutine(code, vm, WTFMove(cases), WTFMove(weakStructures))
, m_cells(cells.size())
, m_callLinkInfos(WTFMove(callLinkInfos))
{
for (unsigned i = cells.size(); i--;)
m_cells[i].set(vm, owner, cells[i]);
}
MarkingGCAwareJITStubRoutine::~MarkingGCAwareJITStubRoutine()
{
}
template<typename Visitor>
ALWAYS_INLINE void MarkingGCAwareJITStubRoutine::markRequiredObjectsInternalImpl(Visitor& visitor)
{
for (auto& entry : m_cells)
visitor.append(entry);
}
void MarkingGCAwareJITStubRoutine::markRequiredObjectsInternal(AbstractSlotVisitor& visitor)
{
markRequiredObjectsInternalImpl(visitor);
}
void MarkingGCAwareJITStubRoutine::markRequiredObjectsInternal(SlotVisitor& visitor)
{
markRequiredObjectsInternalImpl(visitor);
}
GCAwareJITStubRoutineWithExceptionHandler::GCAwareJITStubRoutineWithExceptionHandler(
const MacroAssemblerCodeRef<JITStubRoutinePtrTag>& code, VM& vm, FixedVector<RefPtr<AccessCase>>&& cases, FixedVector<StructureID>&& weakStructures, const JSCell* owner, const Vector<JSCell*>& cells, Bag<OptimizingCallLinkInfo>&& callLinkInfos,
CodeBlock* codeBlockForExceptionHandlers, DisposableCallSiteIndex exceptionHandlerCallSiteIndex)
: MarkingGCAwareJITStubRoutine(code, vm, WTFMove(cases), WTFMove(weakStructures), owner, cells, WTFMove(callLinkInfos))
, m_codeBlockWithExceptionHandler(codeBlockForExceptionHandlers)
#if ENABLE(DFG_JIT)
, m_codeOriginPool(&m_codeBlockWithExceptionHandler->codeOrigins())
#endif
, m_exceptionHandlerCallSiteIndex(exceptionHandlerCallSiteIndex)
{
RELEASE_ASSERT(m_codeBlockWithExceptionHandler);
ASSERT(!!m_codeBlockWithExceptionHandler->handlerForIndex(exceptionHandlerCallSiteIndex.bits()));
}
GCAwareJITStubRoutineWithExceptionHandler::~GCAwareJITStubRoutineWithExceptionHandler()
{
#if ENABLE(DFG_JIT)
// We delay deallocation of m_exceptionHandlerCallSiteIndex until GCAwareJITStubRoutineWithExceptionHandler gets destroyed.
// This means that CallSiteIndex can be reserved correctly so long as the code owned by GCAwareJITStubRoutineWithExceptionHandler is on the stack.
// This is important since CallSite can be queried so long as this code is on the stack: StackVisitor can retreive CallSiteIndex from the stack.
ASSERT(!isCompilationThread() && !Thread::mayBeGCThread());
if (m_codeOriginPool)
m_codeOriginPool->removeDisposableCallSiteIndex(m_exceptionHandlerCallSiteIndex);
#endif
}
void GCAwareJITStubRoutineWithExceptionHandler::aboutToDie()
{
m_codeBlockWithExceptionHandler = nullptr;
#if ENABLE(DFG_JIT)
m_codeOriginPool = nullptr;
#endif
}
void GCAwareJITStubRoutineWithExceptionHandler::observeZeroRefCount()
{
#if ENABLE(DFG_JIT)
if (m_codeBlockWithExceptionHandler) {
m_codeBlockWithExceptionHandler->removeExceptionHandlerForCallSite(m_exceptionHandlerCallSiteIndex);
m_codeBlockWithExceptionHandler = nullptr;
}
#endif
Base::observeZeroRefCount();
}
Ref<PolymorphicAccessJITStubRoutine> createICJITStubRoutine(
const MacroAssemblerCodeRef<JITStubRoutinePtrTag>& code,
FixedVector<RefPtr<AccessCase>>&& cases,
FixedVector<StructureID>&& weakStructures,
VM& vm,
const JSCell* owner,
bool makesCalls,
const Vector<JSCell*>& cells,
Bag<OptimizingCallLinkInfo>&& callLinkInfos,
CodeBlock* codeBlockForExceptionHandlers,
DisposableCallSiteIndex exceptionHandlerCallSiteIndex)
{
if (!makesCalls) {
// Allocating CallLinkInfos means we should have calls.
ASSERT(callLinkInfos.isEmpty());
return adoptRef(*new PolymorphicAccessJITStubRoutine(code, vm, WTFMove(cases), WTFMove(weakStructures)));
}
if (codeBlockForExceptionHandlers) {
RELEASE_ASSERT(JITCode::isOptimizingJIT(codeBlockForExceptionHandlers->jitType()));
auto stub = adoptRef(*new GCAwareJITStubRoutineWithExceptionHandler(code, vm, WTFMove(cases), WTFMove(weakStructures), owner, cells, WTFMove(callLinkInfos), codeBlockForExceptionHandlers, exceptionHandlerCallSiteIndex));
stub->makeGCAware(vm);
return stub;
}
if (cells.isEmpty() && callLinkInfos.isEmpty()) {
auto stub = adoptRef(*new PolymorphicAccessJITStubRoutine(code, vm, WTFMove(cases), WTFMove(weakStructures)));
stub->makeGCAware(vm);
return stub;
}
auto stub = adoptRef(*new MarkingGCAwareJITStubRoutine(code, vm, WTFMove(cases), WTFMove(weakStructures), owner, cells, WTFMove(callLinkInfos)));
stub->makeGCAware(vm);
return stub;
}
} // namespace JSC
#endif // ENABLE(JIT)
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