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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.
- */
- #ifndef PropertyName_h
- #define PropertyName_h
- #include "Identifier.h"
- #include "PrivateName.h"
- namespace JSC {
- template <typename CharType>
- ALWAYS_INLINE uint32_t toUInt32FromCharacters(const CharType* characters, unsigned length)
- {
- // An empty string is not a number.
- if (!length)
- return UINT_MAX;
- // Get the first character, turning it into a digit.
- uint32_t value = characters[0] - '0';
- if (value > 9)
- return UINT_MAX;
-
- // Check for leading zeros. If the first characher is 0, then the
- // length of the string must be one - e.g. "042" is not equal to "42".
- if (!value && length > 1)
- return UINT_MAX;
-
- while (--length) {
- // Multiply value by 10, checking for overflow out of 32 bits.
- if (value > 0xFFFFFFFFU / 10)
- return UINT_MAX;
- value *= 10;
-
- // Get the next character, turning it into a digit.
- uint32_t newValue = *(++characters) - '0';
- if (newValue > 9)
- return UINT_MAX;
-
- // Add in the old value, checking for overflow out of 32 bits.
- newValue += value;
- if (newValue < value)
- return UINT_MAX;
- value = newValue;
- }
-
- return value;
- }
- ALWAYS_INLINE uint32_t toUInt32FromStringImpl(StringImpl* impl)
- {
- if (impl->is8Bit())
- return toUInt32FromCharacters(impl->characters8(), impl->length());
- return toUInt32FromCharacters(impl->characters16(), impl->length());
- }
- class PropertyName {
- public:
- PropertyName(const Identifier& propertyName)
- : m_impl(propertyName.impl())
- {
- ASSERT(!m_impl || m_impl->isIdentifier());
- }
- PropertyName(const PrivateName& propertyName)
- : m_impl(propertyName.uid())
- {
- ASSERT(m_impl && m_impl->isEmptyUnique());
- }
- StringImpl* uid() const
- {
- ASSERT(!m_impl || (m_impl->isIdentifier() == !m_impl->isEmptyUnique()));
- return m_impl;
- }
- StringImpl* publicName() const
- {
- ASSERT(!m_impl || (m_impl->isIdentifier() == !m_impl->isEmptyUnique()));
- return m_impl->isIdentifier() ? m_impl : 0;
- }
- static const uint32_t NotAnIndex = UINT_MAX;
- uint32_t asIndex()
- {
- ASSERT(!m_impl || (m_impl->isIdentifier() == !m_impl->isEmptyUnique()));
- return m_impl ? toUInt32FromStringImpl(m_impl) : NotAnIndex;
- }
- private:
- StringImpl* m_impl;
- };
- 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 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();
- }
- }
- #endif
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