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/*
* Copyright (C) 2017 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "WasmName.h"
#include "WasmNameSection.h"
#include <wtf/RefPtr.h>
#include <wtf/StdLibExtras.h>
#include <wtf/text/WTFString.h>
namespace JSC {
class LLIntOffsetsExtractor;
namespace Wasm {
struct NameSection;
// Keep this class copyable when the world is stopped: do not allocate any memory while copying this.
// SamplingProfiler copies it while suspending threads.
struct IndexOrName {
friend class JSC::LLIntOffsetsExtractor;
typedef size_t Index;
private:
#if USE(JSVALUE32_64)
enum class Kind : uint8_t {
Empty,
Index,
Name
};
#endif
public:
IndexOrName()
{
#if USE(JSVALUE64)
m_indexName.index = emptyTag;
#elif USE(JSVALUE32_64)
m_kind = Kind::Empty;
#endif
}
IndexOrName(Index, std::pair<const Name*, RefPtr<NameSection>>&&);
bool isEmpty() const
{
#if USE(JSVALUE64)
return std::bit_cast<Index>(m_indexName) & emptyTag;
#elif USE(JSVALUE32_64)
return m_kind == Kind::Empty;
#endif
}
bool isIndex() const
{
#if USE(JSVALUE64)
return std::bit_cast<Index>(m_indexName) & indexTag;
#elif USE(JSVALUE32_64)
return m_kind == Kind::Index;
#endif
}
bool isName() const
{
return !(isEmpty() || isIndex());
}
Index index() const
{
ASSERT(isIndex());
#if USE(JSVALUE64)
return m_indexName.index & ~indexTag;
#elif USE(JSVALUE32_64)
return m_indexName.index;
#endif
}
const Name* name() const
{
ASSERT(isName());
return m_indexName.name;
}
NameSection* nameSection() const { return m_nameSection.get(); }
void dump(PrintStream&) const;
private:
union {
Index index;
const Name* name;
} m_indexName;
RefPtr<NameSection> m_nameSection;
#if USE(JSVALUE64)
public:
// Use the top bits as tags. Neither pointers nor the function index space should use them.
static constexpr Index indexTag = 1ull << (CHAR_BIT * sizeof(Index) - 1);
static constexpr Index emptyTag = 1ull << (CHAR_BIT * sizeof(Index) - 2);
static constexpr Index allTags = indexTag | emptyTag;
private:
#elif USE(JSVALUE32_64)
// Use an explicit tag as pointers might have high bits set
Kind m_kind;
#endif
};
String makeString(const IndexOrName&);
} } // namespace JSC::Wasm
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