1 files changed, 58 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/heap/ConservativeRoots.cpp b/Source/JavaScriptCore/heap/ConservativeRoots.cpp
new file mode 100644
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--- /dev/null
+++ b/Source/JavaScriptCore/heap/ConservativeRoots.cpp
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+/*
+ * Copyright (C) 2011 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. 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 INC. 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 "ConservativeRoots.h"
+
+namespace JSC {
+
+inline bool isPointerAligned(void* p)
+{
+    return !((intptr_t)(p) & (sizeof(char*) - 1));
+}
+
+void ConservativeRoots::grow()
+{
+    size_t newCapacity = m_capacity == inlineCapacity ? nonInlineCapacity : m_capacity * 2;
+    JSCell** newRoots = static_cast<JSCell**>(OSAllocator::reserveAndCommit(newCapacity * sizeof(JSCell*)));
+    memcpy(newRoots, m_roots, m_size * sizeof(JSCell*));
+    if (m_roots != m_inlineRoots)
+        OSAllocator::decommitAndRelease(m_roots, m_capacity * sizeof(JSCell*));
+    m_capacity = newCapacity;
+    m_roots = newRoots;
+}
+
+void ConservativeRoots::add(void* begin, void* end)
+{
+    ASSERT(begin <= end);
+    ASSERT((static_cast<char*>(end) - static_cast<char*>(begin)) < 0x1000000);
+    ASSERT(isPointerAligned(begin));
+    ASSERT(isPointerAligned(end));
+
+    for (char** it = static_cast<char**>(begin); it != static_cast<char**>(end); ++it)
+        add(*it);
+}
+
+} // namespace JSC