SmallStrings.h revision 2fc2651226baac27029e38c9d6ef883fa32084db
18e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project/* 2231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve Block * Copyright (C) 2008, 2009 Apple Inc. All Rights Reserved. 38e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * 48e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * Redistribution and use in source and binary forms, with or without 58e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * modification, are permitted provided that the following conditions 68e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * are met: 78e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * 1. Redistributions of source code must retain the above copyright 88e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * notice, this list of conditions and the following disclaimer. 98e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * 2. Redistributions in binary form must reproduce the above copyright 108e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * notice, this list of conditions and the following disclaimer in the 118e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * documentation and/or other materials provided with the distribution. 128e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * 138e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 148e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 158e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 168e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR 178e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 188e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 198e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 208e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 218e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 228e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 238e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 248e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project */ 258e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project 268e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project#ifndef SmallStrings_h 278e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project#define SmallStrings_h 288e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project 29635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project#include "UString.h" 302fc2651226baac27029e38c9d6ef883fa32084dbSteve Block#include "WriteBarrier.h" 31ca9cb53ed1119a3fd98fafa0972ffeb56dee1c24Steve Block#include <wtf/FixedArray.h> 328e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project#include <wtf/OwnPtr.h> 338e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project 348e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Projectnamespace JSC { 358e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project 368e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project class JSGlobalData; 378e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project class JSString; 38231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve Block class MarkStack; 398e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project class SmallStringsStorage; 408e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project 41ab9e7a118cf1ea2e3a93dce683b2ded3e7291ddbBen Murdoch class SmallStrings { 42ab9e7a118cf1ea2e3a93dce683b2ded3e7291ddbBen Murdoch WTF_MAKE_NONCOPYABLE(SmallStrings); WTF_MAKE_FAST_ALLOCATED; 438e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project public: 448e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project SmallStrings(); 458e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project ~SmallStrings(); 468e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project 478e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project JSString* emptyString(JSGlobalData* globalData) 488e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project { 498e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project if (!m_emptyString) 508e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project createEmptyString(globalData); 512fc2651226baac27029e38c9d6ef883fa32084dbSteve Block return m_emptyString.get(); 528e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project } 538e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project JSString* singleCharacterString(JSGlobalData* globalData, unsigned char character) 548e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project { 558e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project if (!m_singleCharacterStrings[character]) 568e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project createSingleCharacterString(globalData, character); 572fc2651226baac27029e38c9d6ef883fa32084dbSteve Block return m_singleCharacterStrings[character].get(); 588e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project } 598e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project 60f486d19d62f1bc33246748b14b14a9dfa617b57fIain Merrick StringImpl* singleCharacterStringRep(unsigned char character); 61635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 62231d4e3152a9c27a73b6ac7badbe6be673aa3ddfSteve Block void markChildren(MarkStack&); 638a0914b749bbe7da7768e07a7db5c6d4bb09472bSteve Block void clear(); 64635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 65635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project unsigned count() const; 6621939df44de1705786c545cd1bf519d47250322dBen Murdoch#if ENABLE(JIT) 672fc2651226baac27029e38c9d6ef883fa32084dbSteve Block JSCell** singleCharacterStrings() { return m_singleCharacterStrings[0].slot(); } 6821939df44de1705786c545cd1bf519d47250322dBen Murdoch#endif 698e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project private: 708e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project void createEmptyString(JSGlobalData*); 718e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project void createSingleCharacterString(JSGlobalData*, unsigned char); 728e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project 732fc2651226baac27029e38c9d6ef883fa32084dbSteve Block DeprecatedPtr<JSString> m_emptyString; 742fc2651226baac27029e38c9d6ef883fa32084dbSteve Block FixedArray<DeprecatedPtr<JSString>, 0x100> m_singleCharacterStrings; 758e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project OwnPtr<SmallStringsStorage> m_storage; 768e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project }; 778e35f3cfc7fba1d1c829dc557ebad6409cbe16a2The Android Open Source Project 78635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project} // namespace JSC 79635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project 80635860845790a19bf50bbc51ba8fb66a96dde068The Android Open Source Project#endif // SmallStrings_h 81