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/*
* Copyright (C) 2013-2019 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
#if ENABLE(FTL_JIT)
#include "FTLLocation.h"
#include "FTLSlowPathCallKey.h"
#include "MacroAssemblerCodeRef.h"
#include <wtf/HashMap.h>
namespace JSC {
class VM;
namespace FTL {
MacroAssemblerCodeRef<JITThunkPtrTag> osrExitGenerationThunkGenerator(VM&);
MacroAssemblerCodeRef<JITThunkPtrTag> lazySlowPathGenerationThunkGenerator(VM&);
MacroAssemblerCodeRef<JITThunkPtrTag> slowPathCallThunkGenerator(VM&, const SlowPathCallKey&);
template<typename KeyTypeArgument>
struct ThunkMap {
typedef KeyTypeArgument KeyType;
typedef HashMap<KeyType, MacroAssemblerCodeRef<JITThunkPtrTag>> ToThunkMap;
typedef HashMap<MacroAssemblerCodePtr<JITThunkPtrTag>, KeyType> FromThunkMap;
ToThunkMap m_toThunk;
FromThunkMap m_fromThunk;
};
template<typename MapType, typename GeneratorType>
MacroAssemblerCodeRef<JITThunkPtrTag> generateIfNecessary(
VM& vm, MapType& map, const typename MapType::KeyType& key, GeneratorType generator)
{
typename MapType::ToThunkMap::iterator iter = map.m_toThunk.find(key);
if (iter != map.m_toThunk.end())
return iter->value;
MacroAssemblerCodeRef<JITThunkPtrTag> result = generator(vm, key);
map.m_toThunk.add(key, result);
map.m_fromThunk.add(result.code(), key);
return result;
}
template<typename MapType>
typename MapType::KeyType keyForThunk(MapType& map, MacroAssemblerCodePtr<JITThunkPtrTag> ptr)
{
typename MapType::FromThunkMap::iterator iter = map.m_fromThunk.find(ptr);
RELEASE_ASSERT(iter != map.m_fromThunk.end());
return iter->value;
}
class Thunks {
WTF_MAKE_FAST_ALLOCATED;
WTF_MAKE_NONCOPYABLE(Thunks);
public:
Thunks() = default;
MacroAssemblerCodeRef<JITThunkPtrTag> getSlowPathCallThunk(VM& vm, const SlowPathCallKey& key)
{
Locker locker { m_lock };
return generateIfNecessary(vm, m_slowPathCallThunks, key, slowPathCallThunkGenerator);
}
SlowPathCallKey keyForSlowPathCallThunk(MacroAssemblerCodePtr<JITThunkPtrTag> ptr)
{
Locker locker { m_lock };
return keyForThunk(m_slowPathCallThunks, ptr);
}
private:
Lock m_lock;
ThunkMap<SlowPathCallKey> m_slowPathCallThunks;
};
} } // namespace JSC::FTL
#endif // ENABLE(FTL_JIT)