/*

 * Copyright (C) 2008 Apple Inc. All rights reserved.

 * Copyright (C) 2008 Cameron Zwarich <cwzwarich@uwaterloo.ca>

 *

 * 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.

 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of

 *     its contributors may be used to endorse or promote products derived

 *     from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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 JumpTable_h

#define JumpTable_h

#include "MacroAssembler.h"

#include "UString.h"

#include <wtf/HashMap.h>

#include <wtf/Vector.h>

namespace JSC {

    struct OffsetLocation {

        int32_t branchOffset;

#if ENABLE(JIT)

        CodeLocationLabel ctiOffset;

#endif

    };

    struct StringJumpTable {

        typedef HashMap<RefPtr<UString::Rep>, OffsetLocation> StringOffsetTable;

        StringOffsetTable offsetTable;

#if ENABLE(JIT)

        CodeLocationLabel ctiDefault; // FIXME: it should not be necessary to store this.

#endif

        inline int32_t offsetForValue(UString::Rep* value, int32_t defaultOffset)

        {

            StringOffsetTable::const_iterator end = offsetTable.end();

            StringOffsetTable::const_iterator loc = offsetTable.find(value);

            if (loc == end)

                return defaultOffset;

            return loc->second.branchOffset;

        }

#if ENABLE(JIT)

        inline CodeLocationLabel ctiForValue(UString::Rep* value)

        {

            StringOffsetTable::const_iterator end = offsetTable.end();

            StringOffsetTable::const_iterator loc = offsetTable.find(value);

            if (loc == end)

                return ctiDefault;

            return loc->second.ctiOffset;

        }

#endif

    };

    struct SimpleJumpTable {

        // FIXME: The two Vectors can be combind into one Vector<OffsetLocation>

        Vector<int32_t> branchOffsets;

        int32_t min;

#if ENABLE(JIT)

        Vector<CodeLocationLabel> ctiOffsets;

        CodeLocationLabel ctiDefault;

#endif

        int32_t offsetForValue(int32_t value, int32_t defaultOffset);

        void add(int32_t key, int32_t offset)

        {

            if (!branchOffsets[key])

                branchOffsets[key] = offset;

        }

#if ENABLE(JIT)

        inline CodeLocationLabel ctiForValue(int32_t value)

        {

            if (value >= min && static_cast<uint32_t>(value - min) < ctiOffsets.size())

                return ctiOffsets[value - min];

            return ctiDefault;

        }

#endif

    };

} // namespace JSC

#endif // JumpTable_h