mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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122 lines
4.5 KiB
C++
122 lines
4.5 KiB
C++
/*
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* Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>.
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* Copyright (C) 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. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <limits>
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#include <wtf/Vector.h>
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#include <wtf/text/StringHash.h>
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#include <wtf/text/WTFString.h>
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namespace JSC {
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class TemplateObjectDescriptorTable;
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class TemplateObjectDescriptor : public RefCounted<TemplateObjectDescriptor> {
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public:
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typedef Vector<String, 4> StringVector;
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typedef Vector<Optional<String>, 4> OptionalStringVector;
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enum DeletedValueTag { DeletedValue };
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TemplateObjectDescriptor(DeletedValueTag);
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enum EmptyValueTag { EmptyValue };
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TemplateObjectDescriptor(EmptyValueTag);
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bool isDeletedValue() const { return m_rawStrings.isEmpty() && m_hash == std::numeric_limits<unsigned>::max(); }
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bool isEmptyValue() const { return m_rawStrings.isEmpty() && !m_hash; }
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unsigned hash() const { return m_hash; }
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const StringVector& rawStrings() const { return m_rawStrings; }
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const OptionalStringVector& cookedStrings() const { return m_cookedStrings; }
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bool operator==(const TemplateObjectDescriptor& other) const { return m_hash == other.m_hash && m_rawStrings == other.m_rawStrings; }
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bool operator!=(const TemplateObjectDescriptor& other) const { return m_hash != other.m_hash || m_rawStrings != other.m_rawStrings; }
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struct Hasher {
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static unsigned hash(const TemplateObjectDescriptor& key) { return key.hash(); }
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static bool equal(const TemplateObjectDescriptor& a, const TemplateObjectDescriptor& b) { return a == b; }
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static constexpr bool safeToCompareToEmptyOrDeleted = false;
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};
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static unsigned calculateHash(const StringVector& rawStrings);
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~TemplateObjectDescriptor();
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static Ref<TemplateObjectDescriptor> create(StringVector&& rawStrings, OptionalStringVector&& cookedStrings)
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{
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return adoptRef(*new TemplateObjectDescriptor(WTFMove(rawStrings), WTFMove(cookedStrings)));
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}
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private:
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TemplateObjectDescriptor(StringVector&& rawStrings, OptionalStringVector&& cookedStrings);
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StringVector m_rawStrings;
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OptionalStringVector m_cookedStrings;
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unsigned m_hash { 0 };
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};
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inline TemplateObjectDescriptor::TemplateObjectDescriptor(StringVector&& rawStrings, OptionalStringVector&& cookedStrings)
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: m_rawStrings(WTFMove(rawStrings))
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, m_cookedStrings(WTFMove(cookedStrings))
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, m_hash(calculateHash(m_rawStrings))
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{
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}
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inline TemplateObjectDescriptor::TemplateObjectDescriptor(DeletedValueTag)
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: m_hash(std::numeric_limits<unsigned>::max())
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{
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}
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inline TemplateObjectDescriptor::TemplateObjectDescriptor(EmptyValueTag)
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: m_hash(0)
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{
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}
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inline unsigned TemplateObjectDescriptor::calculateHash(const StringVector& rawStrings)
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{
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StringHasher hasher;
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for (const String& string : rawStrings) {
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if (string.is8Bit())
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hasher.addCharacters(string.characters8(), string.length());
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else
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hasher.addCharacters(string.characters16(), string.length());
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}
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return hasher.hash();
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}
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} // namespace JSC
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namespace WTF {
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template<typename> struct DefaultHash;
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template<> struct DefaultHash<JSC::TemplateObjectDescriptor> : JSC::TemplateObjectDescriptor::Hasher { };
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template<> struct HashTraits<JSC::TemplateObjectDescriptor> : CustomHashTraits<JSC::TemplateObjectDescriptor> {
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};
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} // namespace WTF
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