mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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125 lines
4.3 KiB
C++
125 lines
4.3 KiB
C++
/*
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* Copyright (C) 2008-2018 Apple Inc. All rights reserved.
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* Copyright (C) 2008 Cameron Zwarich <cwzwarich@uwaterloo.ca>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Apple Inc. ("Apple") nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "CodeLocation.h"
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#include <wtf/HashMap.h>
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#include <wtf/Vector.h>
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#include <wtf/text/StringImpl.h>
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namespace JSC {
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struct OffsetLocation {
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int32_t branchOffset;
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#if ENABLE(JIT)
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CodeLocationLabel<JSSwitchPtrTag> ctiOffset;
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#endif
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};
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struct StringJumpTable {
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typedef HashMap<RefPtr<StringImpl>, OffsetLocation> StringOffsetTable;
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StringOffsetTable offsetTable;
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#if ENABLE(JIT)
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CodeLocationLabel<JSSwitchPtrTag> ctiDefault; // FIXME: it should not be necessary to store this.
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#endif
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inline int32_t offsetForValue(StringImpl* value, int32_t defaultOffset)
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{
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StringOffsetTable::const_iterator end = offsetTable.end();
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StringOffsetTable::const_iterator loc = offsetTable.find(value);
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if (loc == end)
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return defaultOffset;
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return loc->value.branchOffset;
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}
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#if ENABLE(JIT)
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inline CodeLocationLabel<JSSwitchPtrTag> ctiForValue(StringImpl* value)
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{
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StringOffsetTable::const_iterator end = offsetTable.end();
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StringOffsetTable::const_iterator loc = offsetTable.find(value);
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if (loc == end)
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return ctiDefault;
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return loc->value.ctiOffset;
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}
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#endif
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void clear()
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{
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offsetTable.clear();
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}
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};
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struct SimpleJumpTable {
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// FIXME: The two Vectors can be combined into one Vector<OffsetLocation>
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Vector<int32_t> branchOffsets;
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int32_t min { INT32_MIN };
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#if ENABLE(JIT)
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Vector<CodeLocationLabel<JSSwitchPtrTag>> ctiOffsets;
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CodeLocationLabel<JSSwitchPtrTag> ctiDefault;
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#endif
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#if ENABLE(DFG_JIT)
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// JIT part can be later expanded without taking a lock while non-JIT part is stable after CodeBlock is finalized.
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SimpleJumpTable cloneNonJITPart() const
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{
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SimpleJumpTable result;
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result.branchOffsets = branchOffsets;
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result.min = min;
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return result;
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}
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#endif
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int32_t offsetForValue(int32_t value, int32_t defaultOffset);
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#if ENABLE(JIT)
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void ensureCTITable()
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{
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ASSERT(ctiOffsets.isEmpty() || ctiOffsets.size() == branchOffsets.size());
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ctiOffsets.grow(branchOffsets.size());
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}
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inline CodeLocationLabel<JSSwitchPtrTag> ctiForValue(int32_t value)
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{
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if (value >= min && static_cast<uint32_t>(value - min) < ctiOffsets.size())
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return ctiOffsets[value - min];
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return ctiDefault;
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}
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#endif
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#if ENABLE(DFG_JIT)
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void clear()
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{
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branchOffsets.clear();
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ctiOffsets.clear();
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}
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#endif
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};
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} // namespace JSC
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