Imported QtWebKit TP3 (git b57bc6801f1876c3220d5a4bfea33d620d477443)

Change-Id: I3b1d8a2808782c9f34d50240000e20cb38d3680f
Reviewed-by: Konstantin Tokarev <annulen@yandex.ru>

1 files changed, 91 insertions, 0 deletions

diff --git a/Source/bmalloc/bmalloc/XLargeMap.cpp b/Source/bmalloc/bmalloc/XLargeMap.cpp
new file mode 100644
index 000000000..ab38ffe9f
--- /dev/null
+++ b/Source/bmalloc/bmalloc/XLargeMap.cpp
@@ -0,0 +1,91 @@
+/*
+ * Copyright (C) 2016 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 "XLargeMap.h"
+#include <utility>
+
+namespace bmalloc {
+
+XLargeRange XLargeMap::remove(size_t alignment, size_t size)
+{
+    size_t alignmentMask = alignment - 1;
+
+    XLargeRange* candidate = m_free.end();
+    for (XLargeRange* it = m_free.begin(); it != m_free.end(); ++it) {
+        if (it->size() < size)
+            continue;
+
+        if (candidate != m_free.end() && candidate->begin() < it->begin())
+            continue;
+
+        if (test(it->begin(), alignmentMask)) {
+            char* aligned = roundUpToMultipleOf(alignment, it->begin());
+            if (aligned < it->begin()) // Check for overflow.
+                continue;
+
+            char* alignedEnd = aligned + size;
+            if (alignedEnd < aligned) // Check for overflow.
+                continue;
+
+            if (alignedEnd > it->end())
+                continue;
+        }
+
+        candidate = it;
+    }
+    
+    if (candidate == m_free.end())
+        return XLargeRange();
+
+    return m_free.pop(candidate);
+}
+
+void XLargeMap::add(const XLargeRange& range)
+{
+    XLargeRange merged = range;
+
+    for (size_t i = 0; i < m_free.size(); ++i) {
+        if (!canMerge(merged, m_free[i]))
+            continue;
+
+        merged = merge(merged, m_free.pop(i--));
+    }
+    
+    m_free.push(merged);
+}
+
+XLargeRange XLargeMap::removePhysical()
+{
+    auto it = std::find_if(m_free.begin(), m_free.end(), [](const XLargeRange& range) {
+        return range.physicalSize();
+    });
+
+    if (it == m_free.end())
+        return XLargeRange();
+
+    return m_free.pop(it);
+}
+
+} // namespace bmalloc