99 lines
3.7 KiB
C++
99 lines
3.7 KiB
C++
/*
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* Copyright (C) 2018 Apple Inc. All rights reserved.
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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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* 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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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* 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
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* OF 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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#if ENABLE(JIT)
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#include "CodeLocation.h"
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#include <wtf/StdLibExtras.h>
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#include <wtf/Vector.h>
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namespace JSC {
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class JITCodeMap {
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public:
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static_assert(std::is_trivially_destructible_v<BytecodeIndex>);
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static_assert(std::is_trivially_destructible_v<CodeLocationLabel<JSEntryPtrTag>>);
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static_assert(alignof(CodeLocationLabel<JSEntryPtrTag>) >= alignof(BytecodeIndex), "Putting CodeLocationLabel vector first since we can avoid alignment consideration of BytecodeIndex vector");
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JITCodeMap() = default;
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JITCodeMap(Vector<BytecodeIndex>&& indexes, Vector<CodeLocationLabel<JSEntryPtrTag>>&& codeLocations)
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: m_size(indexes.size())
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{
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ASSERT(indexes.size() == codeLocations.size());
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m_pointer = MallocPtr<uint8_t>::malloc(sizeof(CodeLocationLabel<JSEntryPtrTag>) * m_size + sizeof(BytecodeIndex) * m_size);
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std::copy(codeLocations.begin(), codeLocations.end(), this->codeLocations());
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std::copy(indexes.begin(), indexes.end(), this->indexes());
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}
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CodeLocationLabel<JSEntryPtrTag> find(BytecodeIndex bytecodeIndex) const
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{
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auto* index = binarySearch<BytecodeIndex, BytecodeIndex>(indexes(), m_size, bytecodeIndex, [] (BytecodeIndex* index) { return *index; });
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if (!index)
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return CodeLocationLabel<JSEntryPtrTag>();
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return codeLocations()[index - indexes()];
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}
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explicit operator bool() const { return m_size; }
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private:
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CodeLocationLabel<JSEntryPtrTag>* codeLocations() const
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{
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return bitwise_cast<CodeLocationLabel<JSEntryPtrTag>*>(m_pointer.get());
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}
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BytecodeIndex* indexes() const
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{
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return bitwise_cast<BytecodeIndex*>(m_pointer.get() + sizeof(CodeLocationLabel<JSEntryPtrTag>) * m_size);
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}
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MallocPtr<uint8_t> m_pointer;
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unsigned m_size { 0 };
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};
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class JITCodeMapBuilder {
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WTF_MAKE_NONCOPYABLE(JITCodeMapBuilder);
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public:
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JITCodeMapBuilder() = default;
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void append(BytecodeIndex bytecodeIndex, CodeLocationLabel<JSEntryPtrTag> codeLocation)
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{
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m_indexes.append(bytecodeIndex);
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m_codeLocations.append(codeLocation);
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}
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JITCodeMap finalize()
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{
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return JITCodeMap(WTFMove(m_indexes), WTFMove(m_codeLocations));
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}
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private:
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Vector<BytecodeIndex> m_indexes;
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Vector<CodeLocationLabel<JSEntryPtrTag>> m_codeLocations;
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};
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} // namespace JSC
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#endif // ENABLE(JIT)
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