| /* |
| * Copyright (C) 2008, 2010 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. |
| */ |
| |
| #include "config.h" |
| #include "SmallStrings.h" |
| |
| #include "HeapRootVisitor.h" |
| #include "JSGlobalObject.h" |
| #include "JSString.h" |
| #include <wtf/Noncopyable.h> |
| #include <wtf/PassOwnPtr.h> |
| #include <wtf/text/StringImpl.h> |
| |
| namespace JSC { |
| |
| static inline void finalize(JSString*& string) |
| { |
| if (!string || Heap::isMarked(string)) |
| return; |
| string = 0; |
| } |
| |
| class SmallStringsStorage { |
| WTF_MAKE_NONCOPYABLE(SmallStringsStorage); WTF_MAKE_FAST_ALLOCATED; |
| public: |
| SmallStringsStorage(); |
| |
| StringImpl* rep(unsigned char character) |
| { |
| return m_reps[character].get(); |
| } |
| |
| private: |
| static const unsigned singleCharacterStringCount = maxSingleCharacterString + 1; |
| |
| RefPtr<StringImpl> m_reps[singleCharacterStringCount]; |
| }; |
| |
| SmallStringsStorage::SmallStringsStorage() |
| { |
| LChar* characterBuffer = 0; |
| RefPtr<StringImpl> baseString = StringImpl::createUninitialized(singleCharacterStringCount, characterBuffer); |
| for (unsigned i = 0; i < singleCharacterStringCount; ++i) { |
| characterBuffer[i] = i; |
| m_reps[i] = StringImpl::create(baseString, i, 1); |
| } |
| } |
| |
| SmallStrings::SmallStrings() |
| : m_emptyString(0) |
| #define JSC_COMMON_STRINGS_ATTRIBUTE_INITIALIZE(name) , m_##name(0) |
| JSC_COMMON_STRINGS_EACH_NAME(JSC_COMMON_STRINGS_ATTRIBUTE_INITIALIZE) |
| #undef JSC_COMMON_STRINGS_ATTRIBUTE_INITIALIZE |
| { |
| COMPILE_ASSERT(singleCharacterStringCount == sizeof(m_singleCharacterStrings) / sizeof(m_singleCharacterStrings[0]), IsNumCharactersConstInSyncWithClassUsage); |
| |
| for (unsigned i = 0; i < singleCharacterStringCount; ++i) |
| m_singleCharacterStrings[i] = 0; |
| } |
| |
| SmallStrings::~SmallStrings() |
| { |
| } |
| |
| void SmallStrings::finalizeSmallStrings() |
| { |
| finalize(m_emptyString); |
| for (unsigned i = 0; i < singleCharacterStringCount; ++i) |
| finalize(m_singleCharacterStrings[i]); |
| #define JSC_COMMON_STRINGS_ATTRIBUTE_FINALIZE(name) finalize(m_##name); |
| JSC_COMMON_STRINGS_EACH_NAME(JSC_COMMON_STRINGS_ATTRIBUTE_FINALIZE) |
| #undef JSC_COMMON_STRINGS_ATTRIBUTE_FINALIZE |
| } |
| |
| void SmallStrings::createEmptyString(JSGlobalData* globalData) |
| { |
| ASSERT(!m_emptyString); |
| m_emptyString = JSString::createHasOtherOwner(*globalData, StringImpl::empty()); |
| } |
| |
| void SmallStrings::createSingleCharacterString(JSGlobalData* globalData, unsigned char character) |
| { |
| if (!m_storage) |
| m_storage = adoptPtr(new SmallStringsStorage); |
| ASSERT(!m_singleCharacterStrings[character]); |
| m_singleCharacterStrings[character] = JSString::createHasOtherOwner(*globalData, PassRefPtr<StringImpl>(m_storage->rep(character))); |
| } |
| |
| StringImpl* SmallStrings::singleCharacterStringRep(unsigned char character) |
| { |
| if (!m_storage) |
| m_storage = adoptPtr(new SmallStringsStorage); |
| return m_storage->rep(character); |
| } |
| |
| void SmallStrings::initialize(JSGlobalData* globalData, JSString*& string, const char* value) const |
| { |
| string = JSString::create(*globalData, StringImpl::create(value)); |
| } |
| |
| } // namespace JSC |