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Diffstat (limited to 'Source/JavaScriptCore/wtf/BoundsCheckedPointer.h')
| -rw-r--r-- | Source/JavaScriptCore/wtf/BoundsCheckedPointer.h | 287 |
1 files changed, 0 insertions, 287 deletions
diff --git a/Source/JavaScriptCore/wtf/BoundsCheckedPointer.h b/Source/JavaScriptCore/wtf/BoundsCheckedPointer.h deleted file mode 100644 index 1f7caab63..000000000 --- a/Source/JavaScriptCore/wtf/BoundsCheckedPointer.h +++ /dev/null @@ -1,287 +0,0 @@ -/* - * Copyright (C) 2011 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. - * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of - * its contributors may be used to endorse or promote products derived - * from this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY APPLE 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 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 WTF_BoundsCheckedPointer_h -#define WTF_BoundsCheckedPointer_h - -#include <wtf/Assertions.h> -#include <wtf/UnusedParam.h> - -namespace WTF { - -// Useful for when you'd like to do pointer arithmetic on a buffer, but -// you'd also like to get some ASSERT()'s that prevent you from overflowing. -// This should be performance-neutral in release builds, while providing -// you with strong assertions in debug builds. Note that all of the -// asserting happens when you actually access the pointer. You are allowed -// to overflow or underflow with arithmetic so long as no accesses are -// performed. - -template<typename T> -class BoundsCheckedPointer { -public: - BoundsCheckedPointer() - : m_pointer(0) -#if !ASSERT_DISABLED - , m_begin(0) - , m_end(0) -#endif - { - } - - BoundsCheckedPointer(T* pointer, size_t numElements) - : m_pointer(pointer) -#if !ASSERT_DISABLED - , m_begin(pointer) - , m_end(pointer + numElements) -#endif - { - UNUSED_PARAM(numElements); - } - - BoundsCheckedPointer(T* pointer, T* end) - : m_pointer(pointer) -#if !ASSERT_DISABLED - , m_begin(pointer) - , m_end(end) -#endif - { - UNUSED_PARAM(end); - } - - BoundsCheckedPointer(T* pointer, T* begin, size_t numElements) - : m_pointer(pointer) -#if !ASSERT_DISABLED - , m_begin(begin) - , m_end(begin + numElements) -#endif - { - UNUSED_PARAM(begin); - UNUSED_PARAM(numElements); - } - - BoundsCheckedPointer(T* pointer, T* begin, T* end) - : m_pointer(pointer) -#if !ASSERT_DISABLED - , m_begin(begin) - , m_end(end) -#endif - { - UNUSED_PARAM(begin); - UNUSED_PARAM(end); - } - - BoundsCheckedPointer& operator=(T* value) - { - m_pointer = value; - return *this; - } - - BoundsCheckedPointer& operator+=(ptrdiff_t amount) - { - m_pointer += amount; - return *this; - } - - BoundsCheckedPointer& operator-=(ptrdiff_t amount) - { - m_pointer -= amount; - return *this; - } - - BoundsCheckedPointer operator+(ptrdiff_t amount) const - { - BoundsCheckedPointer result = *this; - result.m_pointer += amount; - return result; - } - - BoundsCheckedPointer operator-(ptrdiff_t amount) const - { - BoundsCheckedPointer result = *this; - result.m_pointer -= amount; - return result; - } - - BoundsCheckedPointer operator++() // prefix - { - m_pointer++; - return *this; - } - - BoundsCheckedPointer operator--() // prefix - { - m_pointer--; - return *this; - } - - BoundsCheckedPointer operator++(int) // postfix - { - BoundsCheckedPointer result = *this; - m_pointer++; - return result; - } - - BoundsCheckedPointer operator--(int) // postfix - { - BoundsCheckedPointer result = *this; - m_pointer--; - return result; - } - - bool operator<(T* other) const - { - return m_pointer < other; - } - - bool operator<=(T* other) const - { - return m_pointer <= other; - } - - bool operator>(T* other) const - { - return m_pointer > other; - } - - bool operator>=(T* other) const - { - return m_pointer >= other; - } - - bool operator==(T* other) const - { - return m_pointer == other; - } - - bool operator!=(T* other) const - { - return m_pointer != other; - } - - bool operator<(BoundsCheckedPointer other) const - { - return m_pointer < other.m_pointer; - } - - bool operator<=(BoundsCheckedPointer other) const - { - return m_pointer <= other.m_pointer; - } - - bool operator>(BoundsCheckedPointer other) const - { - return m_pointer > other.m_pointer; - } - - bool operator>=(BoundsCheckedPointer other) const - { - return m_pointer >= other.m_pointer; - } - - bool operator==(BoundsCheckedPointer other) const - { - return m_pointer == other.m_pointer; - } - - bool operator!=(BoundsCheckedPointer other) const - { - return m_pointer != other.m_pointer; - } - - BoundsCheckedPointer operator!() - { - return !m_pointer; - } - - T* get() - { - return m_pointer; - } - - T& operator*() - { - validate(); - return *m_pointer; - } - - const T& operator*() const - { - validate(); - return *m_pointer; - } - - T& operator[](ptrdiff_t index) - { - validate(m_pointer + index); - return m_pointer[index]; - } - - const T& operator[](ptrdiff_t index) const - { - validate(m_pointer + index); - return m_pointer[index]; - } - - // The only thing this has in common with strcat() is that it - // keeps appending from the given pointer until reaching 0. - BoundsCheckedPointer& strcat(const T* source) - { - while (*source) - *(*this)++ = *source++; - return *this; - } - -private: - void validate(T* pointer) const - { - ASSERT_UNUSED(pointer, pointer >= m_begin); - - // This guard is designed to protect against the misaligned case. - // A simple pointer < m_end would miss the case if, for example, - // T = int16_t and pointer is 1 byte less than m_end. - ASSERT_UNUSED(pointer, pointer + 1 <= m_end); - } - - void validate() const - { - validate(m_pointer); - } - - T* m_pointer; -#if !ASSERT_DISABLED - T* m_begin; - T* m_end; -#endif -}; - -} // namespace WTF - -using WTF::BoundsCheckedPointer; - -#endif // WTF_BoundsCheckedPointer_h |