From cad810f21b803229eb11403f9209855525a25d57 Mon Sep 17 00:00:00 2001
From: Steve Block <steveblock@google.com>
Date: Fri, 6 May 2011 11:45:16 +0100
Subject: Merge WebKit at r75315: Initial merge by git.

Change-Id: I570314b346ce101c935ed22a626b48c2af266b84
---
 .../JavaScriptCore/runtime/CollectorHeapIterator.h | 140 +++++++++++++++++++++
 1 file changed, 140 insertions(+)
 create mode 100644 Source/JavaScriptCore/runtime/CollectorHeapIterator.h

(limited to 'Source/JavaScriptCore/runtime/CollectorHeapIterator.h')

diff --git a/Source/JavaScriptCore/runtime/CollectorHeapIterator.h b/Source/JavaScriptCore/runtime/CollectorHeapIterator.h
new file mode 100644
index 0000000..9d107b7
--- /dev/null
+++ b/Source/JavaScriptCore/runtime/CollectorHeapIterator.h
@@ -0,0 +1,140 @@
+/*
+ * Copyright (C) 2008, 2009 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 "config.h"
+#include "Collector.h"
+
+#ifndef CollectorHeapIterator_h
+#define CollectorHeapIterator_h
+
+namespace JSC {
+
+    class CollectorHeapIterator {
+    public:
+        bool operator!=(const CollectorHeapIterator& other);
+        JSCell* operator*() const;
+    
+    protected:
+        CollectorHeapIterator(CollectorHeap&, size_t startBlock, size_t startCell);
+        void advance(size_t max);
+
+        CollectorHeap& m_heap;
+        size_t m_block;
+        size_t m_cell;
+    };
+
+    class LiveObjectIterator : public CollectorHeapIterator {
+    public:
+        LiveObjectIterator(CollectorHeap&, size_t startBlock, size_t startCell = 0);
+        LiveObjectIterator& operator++();
+    };
+
+    class DeadObjectIterator : public CollectorHeapIterator {
+    public:
+        DeadObjectIterator(CollectorHeap&, size_t startBlock, size_t startCell = 0);
+        DeadObjectIterator& operator++();
+    };
+
+    class ObjectIterator : public CollectorHeapIterator {
+    public:
+        ObjectIterator(CollectorHeap&, size_t startBlock, size_t startCell = 0);
+        ObjectIterator& operator++();
+    };
+
+    inline CollectorHeapIterator::CollectorHeapIterator(CollectorHeap& heap, size_t startBlock, size_t startCell)
+        : m_heap(heap)
+        , m_block(startBlock)
+        , m_cell(startCell)
+    {
+    }
+
+    inline bool CollectorHeapIterator::operator!=(const CollectorHeapIterator& other)
+    {
+        return m_block != other.m_block || m_cell != other.m_cell;
+    }
+
+    inline JSCell* CollectorHeapIterator::operator*() const
+    {
+        return reinterpret_cast<JSCell*>(&m_heap.collectorBlock(m_block)->cells[m_cell]);
+    }
+    
+    // Iterators advance up to the next-to-last -- and not the last -- cell in a
+    // block, since the last cell is a dummy sentinel.
+    inline void CollectorHeapIterator::advance(size_t max)
+    {
+        ++m_cell;
+        if (m_cell == max) {
+            m_cell = 0;
+            ++m_block;
+        }
+    }
+
+    inline LiveObjectIterator::LiveObjectIterator(CollectorHeap& heap, size_t startBlock, size_t startCell)
+        : CollectorHeapIterator(heap, startBlock, startCell - 1)
+    {
+        ++(*this);
+    }
+
+    inline LiveObjectIterator& LiveObjectIterator::operator++()
+    {
+        advance(HeapConstants::cellsPerBlock - 1);
+        if (m_block < m_heap.nextBlock || (m_block == m_heap.nextBlock && m_cell < m_heap.nextCell))
+            return *this;
+
+        while (m_block < m_heap.usedBlocks && !m_heap.collectorBlock(m_block)->marked.get(m_cell))
+            advance(HeapConstants::cellsPerBlock - 1);
+        return *this;
+    }
+
+    inline DeadObjectIterator::DeadObjectIterator(CollectorHeap& heap, size_t startBlock, size_t startCell)
+        : CollectorHeapIterator(heap, startBlock, startCell - 1)
+    {
+        ++(*this);
+    }
+
+    inline DeadObjectIterator& DeadObjectIterator::operator++()
+    {
+        do {
+            advance(HeapConstants::cellsPerBlock - 1);
+            ASSERT(m_block > m_heap.nextBlock || (m_block == m_heap.nextBlock && m_cell >= m_heap.nextCell));
+        } while (m_block < m_heap.usedBlocks && m_heap.collectorBlock(m_block)->marked.get(m_cell));
+        return *this;
+    }
+
+    inline ObjectIterator::ObjectIterator(CollectorHeap& heap, size_t startBlock, size_t startCell)
+        : CollectorHeapIterator(heap, startBlock, startCell - 1)
+    {
+        ++(*this);
+    }
+
+    inline ObjectIterator& ObjectIterator::operator++()
+    {
+        advance(HeapConstants::cellsPerBlock - 1);
+        return *this;
+    }
+
+} // namespace JSC
+
+#endif // CollectorHeapIterator_h
-- 
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