Merge WebKit at r75315: Initial merge by git.

Change-Id: I570314b346ce101c935ed22a626b48c2af266b84

1 files changed, 0 insertions, 142 deletions

diff --git a/JavaScriptCore/runtime/SmallStrings.cpp b/JavaScriptCore/runtime/SmallStrings.cpp
deleted file mode 100644
index f358727..0000000
--- a/JavaScriptCore/runtime/SmallStrings.cpp
+++ /dev/null
@@ -1,142 +0,0 @@
-/*
- * 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 "JSGlobalObject.h"
-#include "JSString.h"
-#include <wtf/Noncopyable.h>
-#include <wtf/PassOwnPtr.h>
-
-namespace JSC {
-
-static const unsigned numCharactersToStore = 0x100;
-
-static inline bool isMarked(JSString* string)
-{
-    return string && Heap::isCellMarked(string);
-}
-
-class SmallStringsStorage : public Noncopyable {
-public:
-    SmallStringsStorage();
-
-    StringImpl* rep(unsigned char character) { return m_reps[character].get(); }
-
-private:
-    RefPtr<StringImpl> m_reps[numCharactersToStore];
-};
-
-SmallStringsStorage::SmallStringsStorage()
-{
-    UChar* characterBuffer = 0;
-    RefPtr<StringImpl> baseString = StringImpl::createUninitialized(numCharactersToStore, characterBuffer);
-    for (unsigned i = 0; i < numCharactersToStore; ++i) {
-        characterBuffer[i] = i;
-        m_reps[i] = StringImpl::create(baseString, i, 1);
-    }
-}
-
-SmallStrings::SmallStrings()
-{
-    COMPILE_ASSERT(numCharactersToStore == sizeof(m_singleCharacterStrings) / sizeof(m_singleCharacterStrings[0]), IsNumCharactersConstInSyncWithClassUsage);
-    clear();
-}
-
-SmallStrings::~SmallStrings()
-{
-}
-
-void SmallStrings::markChildren(MarkStack& markStack)
-{
-    /*
-       Our hypothesis is that small strings are very common. So, we cache them
-       to avoid GC churn. However, in cases where this hypothesis turns out to
-       be false -- including the degenerate case where all JavaScript execution
-       has terminated -- we don't want to waste memory.
-
-       To test our hypothesis, we check if any small string has been marked. If
-       so, it's probably reasonable to mark the rest. If not, we clear the cache.
-     */
-
-    bool isAnyStringMarked = isMarked(m_emptyString);
-    for (unsigned i = 0; i < numCharactersToStore && !isAnyStringMarked; ++i)
-        isAnyStringMarked = isMarked(m_singleCharacterStrings[i]);
-    
-    if (!isAnyStringMarked) {
-        clear();
-        return;
-    }
-    
-    if (m_emptyString)
-        markStack.append(m_emptyString);
-    for (unsigned i = 0; i < numCharactersToStore; ++i) {
-        if (m_singleCharacterStrings[i])
-            markStack.append(m_singleCharacterStrings[i]);
-    }
-}
-
-void SmallStrings::clear()
-{
-    m_emptyString = 0;
-    for (unsigned i = 0; i < numCharactersToStore; ++i)
-        m_singleCharacterStrings[i] = 0;
-}
-
-unsigned SmallStrings::count() const
-{
-    unsigned count = 0;
-    if (m_emptyString)
-        ++count;
-    for (unsigned i = 0; i < numCharactersToStore; ++i) {
-        if (m_singleCharacterStrings[i])
-            ++count;
-    }
-    return count;
-}
-
-void SmallStrings::createEmptyString(JSGlobalData* globalData)
-{
-    ASSERT(!m_emptyString);
-    m_emptyString = new (globalData) JSString(globalData, "", JSString::HasOtherOwner);
-}
-
-void SmallStrings::createSingleCharacterString(JSGlobalData* globalData, unsigned char character)
-{
-    if (!m_storage)
-        m_storage = adoptPtr(new SmallStringsStorage);
-    ASSERT(!m_singleCharacterStrings[character]);
-    m_singleCharacterStrings[character] = new (globalData) JSString(globalData, PassRefPtr<StringImpl>(m_storage->rep(character)), JSString::HasOtherOwner);
-}
-
-StringImpl* SmallStrings::singleCharacterStringRep(unsigned char character)
-{
-    if (!m_storage)
-        m_storage = adoptPtr(new SmallStringsStorage);
-    return m_storage->rep(character);
-}
-
-} // namespace JSC