mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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110 lines
3.0 KiB
C++
110 lines
3.0 KiB
C++
/*
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* Copyright (C) 2015-2019 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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#include <limits.h>
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#include <wtf/Assertions.h>
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namespace JSC {
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// A mixin for creating the various kinds of variable offsets that our engine supports.
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template<typename T>
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class GenericOffset {
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WTF_MAKE_FAST_ALLOCATED;
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public:
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static constexpr unsigned invalidOffset = UINT_MAX;
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GenericOffset()
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: m_offset(invalidOffset)
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{
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}
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explicit GenericOffset(unsigned offset)
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: m_offset(offset)
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{
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}
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bool operator!() const { return m_offset == invalidOffset; }
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unsigned offsetUnchecked() const
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{
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return m_offset;
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}
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unsigned offset() const
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{
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ASSERT(m_offset != invalidOffset);
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return m_offset;
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}
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bool operator==(const T& other) const
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{
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return m_offset == other.offsetUnchecked();
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}
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bool operator!=(const T& other) const
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{
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return m_offset != other.offsetUnchecked();
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}
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bool operator<(const T& other) const
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{
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return m_offset < other.offsetUnchecked();
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}
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bool operator>(const T& other) const
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{
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return m_offset > other.offsetUnchecked();
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}
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bool operator<=(const T& other) const
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{
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return m_offset <= other.offsetUnchecked();
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}
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bool operator>=(const T& other) const
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{
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return m_offset >= other.offsetUnchecked();
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}
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T operator+(int value) const
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{
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return T(offset() + value);
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}
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T operator-(int value) const
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{
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return T(offset() - value);
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}
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T& operator+=(int value)
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{
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return *static_cast<T*>(this) = *this + value;
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}
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T& operator-=(int value)
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{
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return *static_cast<T*>(this) = *this - value;
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}
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private:
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unsigned m_offset;
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};
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} // namespace JSC
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