| 1 | /*
|
|---|
| 2 | * Copyright (C) 2008 Apple Inc. All rights reserved.
|
|---|
| 3 | *
|
|---|
| 4 | * Redistribution and use in source and binary forms, with or without
|
|---|
| 5 | * modification, are permitted provided that the following conditions
|
|---|
| 6 | * are met:
|
|---|
| 7 | * 1. Redistributions of source code must retain the above copyright
|
|---|
| 8 | * notice, this list of conditions and the following disclaimer.
|
|---|
| 9 | * 2. Redistributions in binary form must reproduce the above copyright
|
|---|
| 10 | * notice, this list of conditions and the following disclaimer in the
|
|---|
| 11 | * documentation and/or other materials provided with the distribution.
|
|---|
| 12 | *
|
|---|
| 13 | * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
|
|---|
| 14 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|---|
| 15 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|---|
| 16 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
|
|---|
| 17 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
|---|
| 18 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
|---|
| 19 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
|
|---|
| 20 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
|
|---|
| 21 | * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|---|
| 22 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|---|
| 23 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|---|
| 24 | */
|
|---|
| 25 |
|
|---|
| 26 | #ifndef StructureTransitionTable_h
|
|---|
| 27 | #define StructureTransitionTable_h
|
|---|
| 28 |
|
|---|
| 29 | #include "UString.h"
|
|---|
| 30 | #include <wtf/HashFunctions.h>
|
|---|
| 31 | #include <wtf/HashMap.h>
|
|---|
| 32 | #include <wtf/HashTraits.h>
|
|---|
| 33 | #include <wtf/RefPtr.h>
|
|---|
| 34 |
|
|---|
| 35 | namespace JSC {
|
|---|
| 36 |
|
|---|
| 37 | class Structure;
|
|---|
| 38 |
|
|---|
| 39 | struct StructureTransitionTableHash {
|
|---|
| 40 | typedef std::pair<RefPtr<UString::Rep>, unsigned> Key;
|
|---|
| 41 | static unsigned hash(const Key& p)
|
|---|
| 42 | {
|
|---|
| 43 | return p.first->computedHash();
|
|---|
| 44 | }
|
|---|
| 45 |
|
|---|
| 46 | static bool equal(const Key& a, const Key& b)
|
|---|
| 47 | {
|
|---|
| 48 | return a == b;
|
|---|
| 49 | }
|
|---|
| 50 |
|
|---|
| 51 | static const bool safeToCompareToEmptyOrDeleted = true;
|
|---|
| 52 | };
|
|---|
| 53 |
|
|---|
| 54 | struct StructureTransitionTableHashTraits {
|
|---|
| 55 | typedef WTF::HashTraits<RefPtr<UString::Rep> > FirstTraits;
|
|---|
| 56 | typedef WTF::GenericHashTraits<unsigned> SecondTraits;
|
|---|
| 57 | typedef std::pair<FirstTraits::TraitType, SecondTraits::TraitType> TraitType;
|
|---|
| 58 |
|
|---|
| 59 | static const bool emptyValueIsZero = FirstTraits::emptyValueIsZero && SecondTraits::emptyValueIsZero;
|
|---|
| 60 | static TraitType emptyValue() { return std::make_pair(FirstTraits::emptyValue(), SecondTraits::emptyValue()); }
|
|---|
| 61 |
|
|---|
| 62 | static const bool needsDestruction = FirstTraits::needsDestruction || SecondTraits::needsDestruction;
|
|---|
| 63 |
|
|---|
| 64 | static void constructDeletedValue(TraitType& slot) { FirstTraits::constructDeletedValue(slot.first); }
|
|---|
| 65 | static bool isDeletedValue(const TraitType& value) { return FirstTraits::isDeletedValue(value.first); }
|
|---|
| 66 | };
|
|---|
| 67 |
|
|---|
| 68 | typedef HashMap<StructureTransitionTableHash::Key, Structure*, StructureTransitionTableHash, StructureTransitionTableHashTraits> StructureTransitionTable;
|
|---|
| 69 |
|
|---|
| 70 | } // namespace JSC
|
|---|
| 71 |
|
|---|
| 72 | #endif // StructureTransitionTable_h
|
|---|
