Imported WebKit commit 0dc6cd75e1d4836eaffbb520be96fac4847cc9d2 (http://svn.webkit.org/repository/webkit/trunk@131300)

WebKit update which introduces the QtWebKitWidgets module that contains the WK1
widgets based API. (In fact it renames QtWebKit to QtWebKitWidgets while we're
working on completing the entire split as part of
https://bugs.webkit.org/show_bug.cgi?id=99314

1 files changed, 107 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/interpreter/JSStack.cpp b/Source/JavaScriptCore/interpreter/JSStack.cpp
new file mode 100644
index 000000000..5dd708a48
--- /dev/null
+++ b/Source/JavaScriptCore/interpreter/JSStack.cpp
@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2008 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.
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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 "JSStack.h"
+
+#include "ConservativeRoots.h"
+#include "Interpreter.h"
+
+namespace JSC {
+
+static size_t committedBytesCount = 0;
+
+static Mutex& stackStatisticsMutex()
+{
+    DEFINE_STATIC_LOCAL(Mutex, staticMutex, ());
+    return staticMutex;
+}    
+    
+JSStack::~JSStack()
+{
+    void* base = m_reservation.base();
+    m_reservation.decommit(base, reinterpret_cast<intptr_t>(m_commitEnd) - reinterpret_cast<intptr_t>(base));
+    addToCommittedByteCount(-(reinterpret_cast<intptr_t>(m_commitEnd) - reinterpret_cast<intptr_t>(base)));
+    m_reservation.deallocate();
+}
+
+bool JSStack::growSlowCase(Register* newEnd)
+{
+    if (newEnd <= m_commitEnd) {
+        m_end = newEnd;
+        return true;
+    }
+
+    long delta = roundUpAllocationSize(reinterpret_cast<char*>(newEnd) - reinterpret_cast<char*>(m_commitEnd), commitSize);
+    if (reinterpret_cast<char*>(m_commitEnd) + delta > static_cast<char*>(m_reservation.base()) + m_reservation.size())
+        return false;
+
+    m_reservation.commit(m_commitEnd, delta);
+    addToCommittedByteCount(delta);
+    m_commitEnd = reinterpret_cast_ptr<Register*>(reinterpret_cast<char*>(m_commitEnd) + delta);
+    m_end = newEnd;
+    return true;
+}
+
+void JSStack::gatherConservativeRoots(ConservativeRoots& conservativeRoots)
+{
+    conservativeRoots.add(begin(), end());
+}
+
+void JSStack::gatherConservativeRoots(ConservativeRoots& conservativeRoots, JITStubRoutineSet& jitStubRoutines, DFGCodeBlocks& dfgCodeBlocks)
+{
+    conservativeRoots.add(begin(), end(), jitStubRoutines, dfgCodeBlocks);
+}
+
+void JSStack::releaseExcessCapacity()
+{
+    ptrdiff_t delta = reinterpret_cast<uintptr_t>(m_commitEnd) - reinterpret_cast<uintptr_t>(m_reservation.base());
+    m_reservation.decommit(m_reservation.base(), delta);
+    addToCommittedByteCount(-delta);
+    m_commitEnd = static_cast<Register*>(m_reservation.base());
+}
+
+void JSStack::initializeThreading()
+{
+    stackStatisticsMutex();
+}
+
+size_t JSStack::committedByteCount()
+{
+    MutexLocker locker(stackStatisticsMutex());
+    return committedBytesCount;
+}
+
+void JSStack::addToCommittedByteCount(long byteCount)
+{
+    MutexLocker locker(stackStatisticsMutex());
+    ASSERT(static_cast<long>(committedBytesCount) + byteCount > -1);
+    committedBytesCount += byteCount;
+}
+
+} // namespace JSC