1 files changed, 99 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/ftl/FTLThunks.h b/Source/JavaScriptCore/ftl/FTLThunks.h
new file mode 100644
index 000000000..68a9e8f3b
--- /dev/null
+++ b/Source/JavaScriptCore/ftl/FTLThunks.h
@@ -0,0 +1,99 @@
+/*
+ * Copyright (C) 2013 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. 
+ */
+
+#ifndef FTLThunks_h
+#define FTLThunks_h
+
+#if ENABLE(FTL_JIT)
+
+#include "FTLLocation.h"
+#include "FTLSlowPathCallKey.h"
+#include "MacroAssemblerCodeRef.h"
+#include <wtf/HashMap.h>
+
+namespace JSC {
+
+class VM;
+
+namespace FTL {
+
+MacroAssemblerCodeRef osrExitGenerationThunkGenerator(VM*);
+MacroAssemblerCodeRef lazySlowPathGenerationThunkGenerator(VM*);
+MacroAssemblerCodeRef slowPathCallThunkGenerator(VM&, const SlowPathCallKey&);
+
+template<typename KeyTypeArgument>
+struct ThunkMap {
+    typedef KeyTypeArgument KeyType;
+    typedef HashMap<KeyType, MacroAssemblerCodeRef> ToThunkMap;
+    typedef HashMap<MacroAssemblerCodePtr, KeyType> FromThunkMap;
+    
+    ToThunkMap m_toThunk;
+    FromThunkMap m_fromThunk;
+};
+
+template<typename MapType, typename GeneratorType>
+MacroAssemblerCodeRef 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 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 ptr)
+{
+    typename MapType::FromThunkMap::iterator iter = map.m_fromThunk.find(ptr);
+    RELEASE_ASSERT(iter != map.m_fromThunk.end());
+    return iter->value;
+}
+
+class Thunks {
+public:
+    MacroAssemblerCodeRef getSlowPathCallThunk(VM& vm, const SlowPathCallKey& key)
+    {
+        return generateIfNecessary(
+            vm, m_slowPathCallThunks, key, slowPathCallThunkGenerator);
+    }
+    
+    SlowPathCallKey keyForSlowPathCallThunk(MacroAssemblerCodePtr ptr)
+    {
+        return keyForThunk(m_slowPathCallThunks, ptr);
+    }
+    
+private:
+    ThunkMap<SlowPathCallKey> m_slowPathCallThunks;
+};
+
+} } // namespace JSC::FTL
+
+#endif // ENABLE(FTL_JIT)
+
+#endif // FTLTHunks_h