WebKit/Source/JavaScriptCore/jit/GCAwareJITStubRoutine.cpp at main · WebKit/WebKit · GitHub

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* 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"

#include "AccessCase.h"

#include "CacheableIdentifierInlines.h"

#include "CodeBlock.h"

#include "DFGCommonData.h"

#include "Heap.h"

#include "VM.h"

#include "JITStubRoutineSet.h"

#include "JSCellInlines.h"

#include "PropertyInlineCacheClearingWatchpoint.h"

#include "SharedJITStubSet.h"

#include <wtf/RefPtr.h>

namespace JSC {

GCAwareJITStubRoutine::GCAwareJITStubRoutine(Type type, const MacroAssemblerCodeRef<JITStubRoutinePtrTag>& code, JSCell* owner, bool isCodeImmutable)

: JITStubRoutine(type, code)

, m_owner(owner)

, m_isCodeImmutable(isCodeImmutable)

{

}

void GCAwareJITStubRoutine::makeGCAware(VM& vm)

{

vm.heap.m_jitStubRoutines->add(this);

m_isGCAware = true;

}

void GCAwareJITStubRoutine::observeZeroRefCountImpl()

{

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.

IGNORE_GCC_WARNINGS_BEGIN("sequence-point")

delete this;

IGNORE_GCC_WARNINGS_END

return;

}

RELEASE_ASSERT(!m_refCount);

m_isJettisoned = true;

}

void GCAwareJITStubRoutine::deleteFromGC()

{

ASSERT(m_isJettisoned);

ASSERT(!m_refCount);

ASSERT(!m_mayBeExecuting);

IGNORE_GCC_WARNINGS_BEGIN("sequence-point")

delete this;

IGNORE_GCC_WARNINGS_END

}

bool GCAwareJITStubRoutine::removeDeadOwners(VM& vm)

{

ASSERT(vm.heap.isInPhase(CollectorPhase::End));

if (m_owner)

return !vm.heap.isMarked(m_owner);

#if ENABLE(JIT)

if (m_isInSharedJITStubSet) {

auto& owners = static_cast<PolymorphicAccessJITStubRoutine*>(this)->m_owners;

owners.removeAllIf([&](auto pair) {

return !vm.heap.isMarked(pair.key);

});

if (owners.isEmpty()) {

// All owners are dead. Unregistering itself from m_vm.m_sharedJITStubs since it is no longer valid.

vm.m_sharedJITStubs->remove(static_cast<PolymorphicAccessJITStubRoutine*>(this));

return true;

}

return false;

}

#endif

return false;

}

#if ENABLE(JIT)

PolymorphicAccessJITStubRoutine::PolymorphicAccessJITStubRoutine(Type type, const MacroAssemblerCodeRef<JITStubRoutinePtrTag>& code, VM& vm, FixedVector<Ref<AccessCase>>&& cases, FixedVector<StructureID>&& weakStructures, JSCell* owner, bool isCodeImmutable)

: GCAwareJITStubRoutine(type, code, owner, isCodeImmutable)

, m_vm(vm)

, m_cases(WTF::move(cases))

, m_weakStructures(WTF::move(weakStructures))

, m_watchpointSet(WatchpointSet::create(IsWatched))

{

}

PolymorphicAccessJITStubRoutine::~PolymorphicAccessJITStubRoutine() = default;

void PolymorphicAccessJITStubRoutine::observeZeroRefCountImpl()

{

if (m_isInSharedJITStubSet) {

ASSERT(m_vm.m_sharedJITStubs);

m_vm.m_sharedJITStubs->remove(this);

}

// Now PolymorphicAccessJITStubRoutine is no longer referenced. So Watchpoints inside WatchpointSet do not matter. Let's eagerly clear them

m_watchpointSet = nullptr;

m_watchpoints.clear();

Base::observeZeroRefCountImpl();

}

void PolymorphicAccessJITStubRoutine::invalidate()

{

if (RefPtr watchpointSet = WTF::move(m_watchpointSet)) {

StringFireDetail detail("PolymorphicAccessJITStubRoutine has been invalidated");

VM& vm = m_vm;

watchpointSet->fireAll(vm, detail);

}

unsigned PolymorphicAccessJITStubRoutine::computeHash(std::span<const Ref<AccessCase>> cases)

{

if (cases.size() == 1)

return cases.front()->hash();

Hasher hasher;

for (auto& key : cases)

WTF::add(hasher, key->hash());

return hasher.hash();

}

void PolymorphicAccessJITStubRoutine::addGCAwareWatchpoint()

{

if (!m_isGCAware)

makeGCAware(m_vm);

}

void PolymorphicAccessJITStubRoutine::addedToSharedJITStubSet()

{

m_isInSharedJITStubSet = true;

}

bool PolymorphicAccessJITStubRoutine::reconcileWeakReferencesAtGCEndImpl(VM& vm)

{

bool isValid = true;

for (StructureID weakReference : m_weakStructures)

isValid &= vm.heap.isMarked(weakReference.decode());

isValid &= Base::reconcileWeakReferencesAtGCEndImpl(vm);

return isValid;

}

MarkingGCAwareJITStubRoutine::MarkingGCAwareJITStubRoutine(

Type type, const MacroAssemblerCodeRef<JITStubRoutinePtrTag>& code, VM& vm, FixedVector<Ref<AccessCase>>&& cases, FixedVector<StructureID>&& weakStructures, JSCell* owner,

const Vector<JSCell*>& cells, Vector<std::unique_ptr<OptimizingCallLinkInfo>, 16>&& callLinkInfos, bool isCodeImmutable)

: PolymorphicAccessJITStubRoutine(type, code, vm, WTF::move(cases), WTF::move(weakStructures), owner, isCodeImmutable)

, m_cells(cells.size())

, m_callLinkInfos(WTF::move(callLinkInfos))

{

for (unsigned i = cells.size(); i--;) {

if (owner)

m_cells[i].set(vm, owner, cells[i]);

else

m_cells[i].setWithoutWriteBarrier(cells[i]);

}

template<typename Visitor>

ALWAYS_INLINE void MarkingGCAwareJITStubRoutine::markRequiredObjectsInternalImpl(Visitor& visitor)

{

for (auto& entry : m_cells)

visitor.append(entry);

}

void MarkingGCAwareJITStubRoutine::markRequiredObjectsImpl(AbstractSlotVisitor& visitor)

{

markRequiredObjectsInternalImpl(visitor);

}

void MarkingGCAwareJITStubRoutine::markRequiredObjectsImpl(SlotVisitor& visitor)

{

markRequiredObjectsInternalImpl(visitor);

}

bool MarkingGCAwareJITStubRoutine::reconcileWeakReferencesAtGCEndImpl(VM& vm)

{

for (auto& callLinkInfo : m_callLinkInfos) {

if (callLinkInfo)

callLinkInfo->reconcileWeakReferencesAtGCEnd(vm);

}

return Base::reconcileWeakReferencesAtGCEndImpl(vm);

}

CallLinkInfo* MarkingGCAwareJITStubRoutine::callLinkInfoAtImpl(const ConcurrentJSLocker&, unsigned index)

{

if (index < m_callLinkInfos.size())

return m_callLinkInfos[index].get();

return nullptr;

}

GCAwareJITStubRoutineWithExceptionHandler::GCAwareJITStubRoutineWithExceptionHandler(const MacroAssemblerCodeRef<JITStubRoutinePtrTag>& code, VM& vm, FixedVector<Ref<AccessCase>>&& cases, FixedVector<StructureID>&& weakStructures, JSCell* owner, const Vector<JSCell*>& cells, Vector<std::unique_ptr<OptimizingCallLinkInfo>, 16>&& callLinkInfos,

CodeBlock* codeBlockForExceptionHandlers, DisposableCallSiteIndex exceptionHandlerCallSiteIndex, bool isCodeImmutable)

: MarkingGCAwareJITStubRoutine(JITStubRoutine::Type::GCAwareJITStubRoutineWithExceptionHandlerType, code, vm, WTF::move(cases), WTF::move(weakStructures), owner, cells, WTF::move(callLinkInfos), isCodeImmutable)

, 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()) || vm().heap.isInPhase(CollectorPhase::End));

if (m_codeOriginPool)

m_codeOriginPool->removeDisposableCallSiteIndex(m_exceptionHandlerCallSiteIndex);

#endif

}

void GCAwareJITStubRoutineWithExceptionHandler::observeZeroRefCountImpl()

{

#if ENABLE(DFG_JIT)

if (m_codeBlockWithExceptionHandler) {

m_codeBlockWithExceptionHandler->removeExceptionHandlerForCallSite(m_exceptionHandlerCallSiteIndex);

m_codeBlockWithExceptionHandler = nullptr;

}

#endif

Base::observeZeroRefCountImpl();

}

Ref<PolymorphicAccessJITStubRoutine> createICJITStubRoutine(

const MacroAssemblerCodeRef<JITStubRoutinePtrTag>& code,

FixedVector<Ref<AccessCase>>&& cases,

FixedVector<StructureID>&& weakStructures,

VM& vm,

JSCell* owner,

bool makesCalls,

const Vector<JSCell*>& cells,

Vector<std::unique_ptr<OptimizingCallLinkInfo>, 16>&& callLinkInfos,

CodeBlock* codeBlockForExceptionHandlers,

DisposableCallSiteIndex exceptionHandlerCallSiteIndex)

{

if (!makesCalls) {

// Allocating CallLinkInfos means we should have calls.

#if ASSERT_ENABLED

for (auto& callLinkInfo : callLinkInfos)

ASSERT(!callLinkInfo);

#endif

constexpr bool isCodeImmutable = false;

auto stub = adoptRef(*new PolymorphicAccessJITStubRoutine(JITStubRoutine::Type::PolymorphicAccessJITStubRoutineType, code, vm, WTF::move(cases), WTF::move(weakStructures), owner, isCodeImmutable));

stub->makeGCAware(vm);

return stub;

}

if (codeBlockForExceptionHandlers) {

RELEASE_ASSERT(JSC::JITCode::isOptimizingJIT(codeBlockForExceptionHandlers->jitType()));

constexpr bool isCodeImmutable = false;

auto stub = adoptRef(*new GCAwareJITStubRoutineWithExceptionHandler(code, vm, WTF::move(cases), WTF::move(weakStructures), owner, cells, WTF::move(callLinkInfos), codeBlockForExceptionHandlers, exceptionHandlerCallSiteIndex, isCodeImmutable));

stub->makeGCAware(vm);

return stub;

}

bool hasCallLinkInfo = false;

for (auto& callLinkInfo : callLinkInfos) {

if (callLinkInfo) {

hasCallLinkInfo = true;

break;

}

if (cells.isEmpty() && !hasCallLinkInfo) {

constexpr bool isCodeImmutable = false;

auto stub = adoptRef(*new PolymorphicAccessJITStubRoutine(JITStubRoutine::Type::PolymorphicAccessJITStubRoutineType, code, vm, WTF::move(cases), WTF::move(weakStructures), owner, isCodeImmutable));

stub->makeGCAware(vm);

return stub;

}

constexpr bool isCodeImmutable = false;

auto stub = adoptRef(*new MarkingGCAwareJITStubRoutine(JITStubRoutine::Type::MarkingGCAwareJITStubRoutineType, code, vm, WTF::move(cases), WTF::move(weakStructures), owner, cells, WTF::move(callLinkInfos), isCodeImmutable));

stub->makeGCAware(vm);

return stub;

}

Ref<PolymorphicAccessJITStubRoutine> createPreCompiledICJITStubRoutine(const MacroAssemblerCodeRef<JITStubRoutinePtrTag>& code, VM& vm, JSCell* owner)

{

auto stub = adoptRef(*new PolymorphicAccessJITStubRoutine(JITStubRoutine::Type::PolymorphicAccessJITStubRoutineType, code, vm, { }, { }, owner, true));

return stub;

}

#endif // ENABLE(JIT)

} // namespace JSC

WebKit/Source/JavaScriptCore/jit/GCAwareJITStubRoutine.cpp at main · WebKit/WebKit · GitHub

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