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/*
* Copyright (C) 2012 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. AND ITS CONTRIBUTORS ``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 ITS 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 "CacheableIdentifier.h"
#include "Identifier.h"
#include "JSGlobalObjectFunctions.h"
#include "PrivateName.h"
#include <wtf/dtoa.h>
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
namespace JSC {
class PropertyName {
public:
PropertyName(UniquedStringImpl* propertyName)
: m_impl(propertyName)
{
}
PropertyName(const Identifier& propertyName)
: PropertyName(propertyName.impl())
{
}
PropertyName(const CacheableIdentifier& propertyName)
: PropertyName(propertyName.uid())
{
}
PropertyName(const PrivateName& propertyName)
: m_impl(&propertyName.uid())
{
ASSERT(m_impl);
ASSERT(m_impl->isSymbol());
}
bool isNull() const { return !m_impl; }
bool isSymbol() const
{
return m_impl && m_impl->isSymbol();
}
bool isPrivateName() const
{
return isSymbol() && static_cast<const SymbolImpl*>(m_impl)->isPrivate();
}
UniquedStringImpl* uid() const
{
return m_impl;
}
AtomStringImpl* publicName() const
{
return (!m_impl || m_impl->isSymbol()) ? nullptr : static_cast<AtomStringImpl*>(m_impl);
}
void dump(PrintStream& out) const
{
if (m_impl)
out.print(m_impl);
else
out.print("<null property name>");
}
private:
UniquedStringImpl* m_impl;
};
static_assert(sizeof(PropertyName) == sizeof(UniquedStringImpl*), "UniquedStringImpl* and PropertyName should be compatible to invoke easily from JIT code.");
inline bool operator==(PropertyName a, const Identifier& b)
{
return a.uid() == b.impl();
}
inline bool operator==(const Identifier& a, PropertyName b)
{
return a.impl() == b.uid();
}
inline bool operator==(PropertyName a, PropertyName b)
{
return a.uid() == b.uid();
}
inline bool operator==(PropertyName a, const char* b)
{
return equal(a.uid(), b);
}
ALWAYS_INLINE std::optional<uint32_t> parseIndex(PropertyName propertyName)
{
auto uid = propertyName.uid();
if (!uid)
return std::nullopt;
if (uid->isSymbol())
return std::nullopt;
return parseIndex(*uid);
}
template<typename CharacterType>
ALWAYS_INLINE std::optional<bool> fastIsCanonicalNumericIndexString(std::span<const CharacterType> characters)
{
auto* rawCharacters = characters.data();
auto length = characters.size();
ASSERT(length >= 1);
auto first = rawCharacters[0];
if (length == 1)
return isASCIIDigit(first);
auto second = rawCharacters[1];
if (first == '-') {
// -Infinity case should go to the slow path. -NaN cannot exist since it becomes NaN.
if (!isASCIIDigit(second) && (length != strlen("-Infinity") || second != 'I'))
return false;
if (length == 2) // Including -0, and it should be accepted.
return true;
} else if (!isASCIIDigit(first)) {
// Infinity and NaN should go to the slow path.
if (!(length == strlen("Infinity") && first == 'I') && !(length == strlen("NaN") && first == 'N'))
return false;
}
return std::nullopt;
}
// https://www.ecma-international.org/ecma-262/9.0/index.html#sec-canonicalnumericindexstring
ALWAYS_INLINE bool isCanonicalNumericIndexString(UniquedStringImpl* propertyName)
{
if (!propertyName)
return false;
if (propertyName->isSymbol())
return false;
if (!propertyName->length())
return false;
auto fastResult = propertyName->is8Bit()
? fastIsCanonicalNumericIndexString(propertyName->span8())
: fastIsCanonicalNumericIndexString(propertyName->span16());
if (fastResult)
return *fastResult;
double index = jsToNumber(propertyName);
NumberToStringBuffer buffer;
auto span = WTF::numberToStringAndSize(index, buffer);
return equal(propertyName, byteCast<LChar>(span));
}
} // namespace JSC
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
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