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/*
* Copyright (C) 2008-2024 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 "DOMJITGetterSetter.h"
#include "StructureStubInfo.h"
namespace JSC {
#if ENABLE(JIT)
class SharedJITStubSet {
WTF_MAKE_FAST_ALLOCATED(SharedJITStubSet);
public:
SharedJITStubSet() = default;
using StructureStubInfoKey = std::tuple<AccessType, bool, bool, bool, bool>;
using StatelessCacheKey = std::tuple<StructureStubInfoKey, AccessCase::AccessType>;
using DOMJITCacheKey = std::tuple<StructureStubInfoKey, const DOMJIT::GetterSetter*>;
static StructureStubInfoKey stubInfoKey(const StructureStubInfo& stubInfo)
{
return std::tuple { stubInfo.accessType, static_cast<bool>(stubInfo.propertyIsInt32), static_cast<bool>(stubInfo.propertyIsString), static_cast<bool>(stubInfo.propertyIsSymbol), static_cast<bool>(stubInfo.prototypeIsKnownObject) };
}
struct Hash {
struct Key {
Key() = default;
Key(StructureStubInfoKey stubInfoKey, PolymorphicAccessJITStubRoutine* wrapped)
: m_wrapped(wrapped)
, m_stubInfoKey(stubInfoKey)
{ }
Key(WTF::HashTableDeletedValueType)
: m_wrapped(std::bit_cast<PolymorphicAccessJITStubRoutine*>(static_cast<uintptr_t>(1)))
{ }
bool isHashTableDeletedValue() const { return m_wrapped == std::bit_cast<PolymorphicAccessJITStubRoutine*>(static_cast<uintptr_t>(1)); }
friend bool operator==(const Key&, const Key&) = default;
PolymorphicAccessJITStubRoutine* m_wrapped { nullptr };
StructureStubInfoKey m_stubInfoKey { };
};
using KeyTraits = SimpleClassHashTraits<Key>;
static unsigned hash(const Key& p)
{
if (!p.m_wrapped)
return 1;
return p.m_wrapped->hash();
}
static bool equal(const Key& a, const Key& b)
{
return a == b;
}
static constexpr bool safeToCompareToEmptyOrDeleted = false;
};
struct Searcher {
struct Translator {
static unsigned hash(const Searcher& searcher)
{
return searcher.m_hash;
}
static bool equal(const Hash::Key a, const Searcher& b)
{
if (a.m_stubInfoKey == b.m_stubInfoKey && Hash::hash(a) == b.m_hash) {
if (a.m_wrapped->cases().size() != 1)
return false;
const auto& aCase = a.m_wrapped->cases()[0];
const auto& bCase = b.m_accessCase;
if (!AccessCase::canBeShared(aCase.get(), bCase.get()))
return false;
return true;
}
return false;
}
};
Searcher(StructureStubInfoKey&& stubInfoKey, Ref<AccessCase>&& accessCase)
: m_stubInfoKey(WTFMove(stubInfoKey))
, m_accessCase(WTFMove(accessCase))
, m_hash(m_accessCase->hash())
{
}
StructureStubInfoKey m_stubInfoKey;
Ref<AccessCase> m_accessCase;
unsigned m_hash { 0 };
};
struct PointerTranslator {
static unsigned hash(const PolymorphicAccessJITStubRoutine* stub)
{
return stub->hash();
}
static bool equal(const Hash::Key& key, const PolymorphicAccessJITStubRoutine* stub)
{
return key.m_wrapped == stub;
}
};
void add(Hash::Key&& key)
{
m_stubs.add(WTFMove(key));
}
void remove(PolymorphicAccessJITStubRoutine* stub)
{
auto iter = m_stubs.find<PointerTranslator>(stub);
if (iter != m_stubs.end())
m_stubs.remove(iter);
}
RefPtr<PolymorphicAccessJITStubRoutine> find(const Searcher& searcher)
{
auto entry = m_stubs.find<SharedJITStubSet::Searcher::Translator>(searcher);
if (entry != m_stubs.end())
return entry->m_wrapped;
return nullptr;
}
RefPtr<PolymorphicAccessJITStubRoutine> getStatelessStub(StatelessCacheKey) const;
void setStatelessStub(StatelessCacheKey, Ref<PolymorphicAccessJITStubRoutine>);
MacroAssemblerCodeRef<JITStubRoutinePtrTag> getDOMJITCode(DOMJITCacheKey) const;
void setDOMJITCode(DOMJITCacheKey, MacroAssemblerCodeRef<JITStubRoutinePtrTag>);
RefPtr<InlineCacheHandler> getSlowPathHandler(AccessType) const;
void setSlowPathHandler(AccessType, Ref<InlineCacheHandler>);
private:
UncheckedKeyHashSet<Hash::Key, Hash, Hash::KeyTraits> m_stubs;
UncheckedKeyHashMap<StatelessCacheKey, Ref<PolymorphicAccessJITStubRoutine>> m_statelessStubs;
UncheckedKeyHashMap<DOMJITCacheKey, MacroAssemblerCodeRef<JITStubRoutinePtrTag>> m_domJITCodes;
std::array<RefPtr<InlineCacheHandler>, numberOfAccessTypes> m_fallbackHandlers { };
std::array<RefPtr<InlineCacheHandler>, numberOfAccessTypes> m_slowPathHandlers { };
};
#else
class StructureStubInfo;
#endif // ENABLE(JIT)
} // namespace JSC
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