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JumpTable.h
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/*
* Copyright (C) 2008, 2013 Apple Inc. All rights reserved.
* Copyright (C) 2008 Cameron Zwarich <[email protected]>
*
* 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 <wtf/HashMap.h>
#include <wtf/Vector.h>
#include <wtf/text/StringImpl.h>
namespace JSC {
struct OffsetLocation {
int32_t branchOffset;
#if ENABLE(JIT)
CodeLocationLabel ctiOffset;
#endif
};
struct StringJumpTable {
typedef HashMap<RefPtr<StringImpl>, OffsetLocation> StringOffsetTable;
StringOffsetTable offsetTable;
#if ENABLE(JIT)
CodeLocationLabel ctiDefault; // FIXME: it should not be necessary to store this.
#endif
inline int32_t offsetForValue(StringImpl* value, int32_t defaultOffset)
{
StringOffsetTable::const_iterator end = offsetTable.end();
StringOffsetTable::const_iterator loc = offsetTable.find(value);
if (loc == end)
return defaultOffset;
return loc->value.branchOffset;
}
#if ENABLE(JIT)
inline CodeLocationLabel ctiForValue(StringImpl* value)
{
StringOffsetTable::const_iterator end = offsetTable.end();
StringOffsetTable::const_iterator loc = offsetTable.find(value);
if (loc == end)
return ctiDefault;
return loc->value.ctiOffset;
}
#endif
void clear()
{
offsetTable.clear();
}
};
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
void clear()
{
branchOffsets.clear();
#if ENABLE(JIT)
ctiOffsets.clear();
#endif
}
};
} // namespace JSC
#endif // JumpTable_h