mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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131 lines
3.9 KiB
C++
131 lines
3.9 KiB
C++
/*
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* Copyright (C) 2016 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 <wtf/MathExtras.h>
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#include <wtf/PrintStream.h>
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namespace JSC { namespace DOMJIT {
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class HeapRange {
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public:
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constexpr HeapRange()
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: m_begin(UINT16_MAX)
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, m_end(UINT16_MAX)
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{
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}
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HeapRange(uint16_t begin, uint16_t end)
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: m_begin(begin)
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, m_end(end)
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{
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ASSERT_WITH_MESSAGE(begin <= end, "begin <= end is the invariant of this HeapRange.");
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}
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enum ConstExprTag { ConstExpr };
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constexpr HeapRange(ConstExprTag, uint16_t begin, uint16_t end)
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: m_begin(begin)
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, m_end(end)
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{
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}
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enum RawRepresentationTag { RawRepresentation };
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explicit constexpr HeapRange(RawRepresentationTag, uint32_t value)
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: m_raw(value)
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{
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}
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constexpr static HeapRange fromRaw(uint32_t value)
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{
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return HeapRange(RawRepresentation, value);
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}
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uint16_t begin() const { return m_begin; }
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uint16_t end() const { return m_end; }
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uint32_t rawRepresentation() { return m_raw; }
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constexpr explicit operator bool() const
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{
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return m_begin != m_end;
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}
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constexpr bool operator==(const HeapRange& other) const
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{
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return m_begin == other.m_begin && m_end == other.m_end;
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}
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constexpr bool operator!=(const HeapRange& other) const
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{
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return !operator==(other);
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}
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template<uint16_t begin, uint16_t end>
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static constexpr HeapRange fromConstant()
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{
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static_assert(begin < end || (begin == UINT16_MAX && end == UINT16_MAX), "begin < end or the both are UINT16_MAX is the invariant of this HeapRange.");
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return HeapRange(ConstExpr, begin, end);
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}
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static constexpr HeapRange top() { return fromConstant<0, UINT16_MAX>(); }
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static constexpr HeapRange none() { return fromConstant<UINT16_MAX, UINT16_MAX>(); } // Empty range.
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bool isStrictSubtypeOf(const HeapRange& other) const
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{
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if (!*this || !other)
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return false;
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if (*this == other)
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return false;
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return other.m_begin <= m_begin && m_end <= other.m_end;
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}
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bool isSubtypeOf(const HeapRange& other) const
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{
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if (!*this || !other)
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return false;
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if (*this == other)
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return true;
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return isStrictSubtypeOf(other);
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}
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bool overlaps(const HeapRange& other) const
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{
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return WTF::rangesOverlap(m_begin, m_end, other.m_begin, other.m_end);
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}
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JS_EXPORT_PRIVATE void dump(PrintStream&) const;
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private:
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union {
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struct {
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uint16_t m_begin;
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uint16_t m_end;
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};
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uint32_t m_raw;
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};
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};
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} }
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