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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. ``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.
- */
- #ifndef PropertyOffset_h
- #define PropertyOffset_h
- #include <wtf/Platform.h>
- #include <wtf/StdLibExtras.h>
- namespace JSC {
- typedef int PropertyOffset;
- static const PropertyOffset invalidOffset = -1;
- static const PropertyOffset firstOutOfLineOffset = 100;
- // Declare all of the functions because they tend to do forward calls.
- inline void checkOffset(PropertyOffset);
- inline void checkOffset(PropertyOffset, int inlineCapacity);
- inline void validateOffset(PropertyOffset);
- inline void validateOffset(PropertyOffset, int inlineCapacity);
- inline bool isValidOffset(PropertyOffset);
- inline bool isInlineOffset(PropertyOffset);
- inline bool isOutOfLineOffset(PropertyOffset);
- inline size_t offsetInInlineStorage(PropertyOffset);
- inline size_t offsetInOutOfLineStorage(PropertyOffset);
- inline size_t offsetInRespectiveStorage(PropertyOffset);
- inline size_t numberOfOutOfLineSlotsForLastOffset(PropertyOffset);
- inline size_t numberOfSlotsForLastOffset(PropertyOffset, int inlineCapacity);
- inline void checkOffset(PropertyOffset offset)
- {
- UNUSED_PARAM(offset);
- ASSERT(offset >= invalidOffset);
- }
- inline void checkOffset(PropertyOffset offset, int inlineCapacity)
- {
- UNUSED_PARAM(offset);
- UNUSED_PARAM(inlineCapacity);
- ASSERT(offset >= invalidOffset);
- ASSERT(offset == invalidOffset
- || offset < inlineCapacity
- || isOutOfLineOffset(offset));
- }
- inline void validateOffset(PropertyOffset offset)
- {
- checkOffset(offset);
- ASSERT(isValidOffset(offset));
- }
- inline void validateOffset(PropertyOffset offset, int inlineCapacity)
- {
- checkOffset(offset, inlineCapacity);
- ASSERT(isValidOffset(offset));
- }
- inline bool isValidOffset(PropertyOffset offset)
- {
- checkOffset(offset);
- return offset != invalidOffset;
- }
- inline bool isInlineOffset(PropertyOffset offset)
- {
- checkOffset(offset);
- return offset < firstOutOfLineOffset;
- }
- inline bool isOutOfLineOffset(PropertyOffset offset)
- {
- checkOffset(offset);
- return !isInlineOffset(offset);
- }
- inline size_t offsetInInlineStorage(PropertyOffset offset)
- {
- validateOffset(offset);
- ASSERT(isInlineOffset(offset));
- return offset;
- }
- inline size_t offsetInOutOfLineStorage(PropertyOffset offset)
- {
- validateOffset(offset);
- ASSERT(isOutOfLineOffset(offset));
- return -static_cast<ptrdiff_t>(offset - firstOutOfLineOffset) - 1;
- }
- inline size_t offsetInRespectiveStorage(PropertyOffset offset)
- {
- if (isInlineOffset(offset))
- return offsetInInlineStorage(offset);
- return offsetInOutOfLineStorage(offset);
- }
- inline size_t numberOfOutOfLineSlotsForLastOffset(PropertyOffset offset)
- {
- checkOffset(offset);
- if (offset < firstOutOfLineOffset)
- return 0;
- return offset - firstOutOfLineOffset + 1;
- }
- inline size_t numberOfSlotsForLastOffset(PropertyOffset offset, int inlineCapacity)
- {
- checkOffset(offset, inlineCapacity);
- if (offset < inlineCapacity)
- return offset + 1;
- return inlineCapacity + numberOfOutOfLineSlotsForLastOffset(offset);
- }
- inline PropertyOffset offsetForPropertyNumber(int propertyNumber, int inlineCapacity)
- {
- PropertyOffset offset = propertyNumber;
- if (offset >= inlineCapacity) {
- offset += firstOutOfLineOffset;
- offset -= inlineCapacity;
- }
- return offset;
- }
- } // namespace JSC
- #endif // PropertyOffset_h
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