mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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62 lines
2.3 KiB
C++
62 lines
2.3 KiB
C++
/*
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* Copyright (C) 2017 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 "WasmName.h"
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#include <wtf/StdLibExtras.h>
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#include <wtf/text/WTFString.h>
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namespace JSC { namespace Wasm {
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struct IndexOrName {
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typedef size_t Index;
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IndexOrName()
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: m_index(emptyTag)
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{ }
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IndexOrName(Index, const Name*);
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bool isEmpty() const { return bitwise_cast<Index>(*this) & emptyTag; }
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bool isIndex() const { return bitwise_cast<Index>(*this) & indexTag; }
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bool isName() const { return !(isEmpty() || isName()); }
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friend String makeString(const IndexOrName&);
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private:
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union {
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Index m_index;
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const Name* m_name;
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};
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// Use the top bits as tags. Neither pointers nor the function index space should use them.
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static constexpr Index indexTag = 1ull << (CHAR_BIT * sizeof(Index) - 1);
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static constexpr Index emptyTag = 1ull << (CHAR_BIT * sizeof(Index) - 2);
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static constexpr Index allTags = indexTag | emptyTag;
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};
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String makeString(const IndexOrName&);
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} } // namespace JSC::Wasm
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