ftl/FTLThunks.h

   1 /*
   2  * Copyright (C) 2013 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef FTLThunks_h
  27 #define FTLThunks_h
  28
  29 #if ENABLE(FTL_JIT)
  30
  31 #include "FTLLocation.h"
  32 #include "FTLSlowPathCallKey.h"
  33 #include "MacroAssemblerCodeRef.h"
  34 #include <wtf/HashMap.h>
  35
  36 namespace JSC {
  37
  38 class VM;
  39
  40 namespace FTL {
  41
  42 MacroAssemblerCodeRef osrExitGenerationThunkGenerator(VM*);
  43 MacroAssemblerCodeRef slowPathCallThunkGenerator(VM&, const SlowPathCallKey&);
  44
  45 template<typename KeyTypeArgument>
  46 struct ThunkMap {
  47     typedef KeyTypeArgument KeyType;
  48     typedef HashMap<KeyType, MacroAssemblerCodeRef> ToThunkMap;
  49     typedef HashMap<MacroAssemblerCodePtr, KeyType> FromThunkMap;
  50
  51     ToThunkMap m_toThunk;
  52     FromThunkMap m_fromThunk;
  53 };
  54
  55 template<typename MapType, typename GeneratorType>
  56 MacroAssemblerCodeRef generateIfNecessary(
  57     VM& vm, MapType& map, const typename MapType::KeyType& key, GeneratorType generator)
  58 {
  59     typename MapType::ToThunkMap::iterator iter = map.m_toThunk.find(key);
  60     if (iter != map.m_toThunk.end())
  61         return iter->value;
  62
  63     MacroAssemblerCodeRef result = generator(vm, key);
  64     map.m_toThunk.add(key, result);
  65     map.m_fromThunk.add(result.code(), key);
  66     return result;
  67 }
  68
  69 template<typename MapType>
  70 typename MapType::KeyType keyForThunk(MapType& map, MacroAssemblerCodePtr ptr)
  71 {
  72     typename MapType::FromThunkMap::iterator iter = map.m_fromThunk.find(ptr);
  73     RELEASE_ASSERT(iter != map.m_fromThunk.end());
  74     return iter->value;
  75 }
  76
  77 class Thunks {
  78 public:
  79     MacroAssemblerCodeRef getSlowPathCallThunk(VM& vm, const SlowPathCallKey& key)
  80     {
  81         return generateIfNecessary(
  82             vm, m_slowPathCallThunks, key, slowPathCallThunkGenerator);
  83     }
  84
  85     SlowPathCallKey keyForSlowPathCallThunk(MacroAssemblerCodePtr ptr)
  86     {
  87         return keyForThunk(m_slowPathCallThunks, ptr);
  88     }
  89
  90 private:
  91     ThunkMap<SlowPathCallKey> m_slowPathCallThunks;
  92 };
  93
  94 } } // namespace JSC::FTL
  95
  96 #endif // ENABLE(FTL_JIT)
  97
  98 #endif // FTLTHunks_h