Imported QtWebKit TP3 (git b57bc6801f1876c3220d5a4bfea33d620d477443)

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

1 files changed, 72 insertions, 0 deletions

diff --git a/Source/bmalloc/bmalloc/Zone.h b/Source/bmalloc/bmalloc/Zone.h
new file mode 100644
index 000000000..2d197f950
--- /dev/null
+++ b/Source/bmalloc/bmalloc/Zone.h
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2014, 2015 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. 
+ */
+
+#ifndef Zone_h
+#define Zone_h
+
+#include "FixedVector.h"
+#include <malloc/malloc.h>
+
+namespace bmalloc {
+
+class Chunk;
+
+class Zone : public malloc_zone_t {
+public:
+    // Enough capacity to track a 64GB heap, so probably enough for anything.
+    static const size_t capacity = 2048;
+
+    Zone();
+    Zone(task_t, memory_reader_t, vm_address_t);
+
+    void addChunk(Chunk*);
+    FixedVector<Chunk*, capacity>& chunks() { return m_chunks; }
+    
+private:
+    // This vector has two purposes:
+    //     (1) It stores the list of Chunks so that we can enumerate
+    //         each Chunk and request that it be scanned if reachable.
+    //     (2) It roots a pointer to each Chunk in a global non-malloc
+    //         VM region, making each Chunk appear reachable, and therefore
+    //         ensuring that the leaks tool will scan it. (The leaks tool
+    //         conservatively scans all writeable VM regions that are not malloc
+    //         regions, and then scans malloc regions using the introspection API.)
+    // This prevents the leaks tool from reporting false positive leaks for
+    // objects pointed to from bmalloc memory -- though it also prevents the
+    // leaks tool from finding any leaks in bmalloc memory.
+    FixedVector<Chunk*, capacity> m_chunks;
+};
+
+inline void Zone::addChunk(Chunk* chunk)
+{
+    if (m_chunks.size() == m_chunks.capacity())
+        return;
+    
+    m_chunks.push(chunk);
+}
+
+} // namespace bmalloc
+
+#endif // Zone_h