From 8995b83bcbfbb68245f779b64e5517627c6cc6ea Mon Sep 17 00:00:00 2001
From: Simon Hausmann <simon.hausmann@digia.com>
Date: Wed, 17 Oct 2012 16:21:14 +0200
Subject: Imported WebKit commit cf4f8fc6f19b0629f51860cb2d4b25e139d07e00
 (http://svn.webkit.org/repository/webkit/trunk@131592)

New snapshot that includes the build fixes for Mac OS X 10.6 and earlier as well
as the previously cherry-picked changes
---
 Source/JavaScriptCore/interpreter/JSStack.cpp | 107 ++++++++++++++++++++++++++
 1 file changed, 107 insertions(+)
 create mode 100644 Source/JavaScriptCore/interpreter/JSStack.cpp

(limited to 'Source/JavaScriptCore/interpreter/JSStack.cpp')

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
-- 
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