--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/porting/src/smallobject.h	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,182 @@
+/****************************************************************************
+**
+** Copyright (C) 2001-2004 Roberto Raggi
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the qt3to4 porting application of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef SMALLOBJECT_H
+#define SMALLOBJECT_H
+
+#include <QList>
+
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+
+QT_BEGIN_NAMESPACE
+
+struct block_t
+{
+    static int N;
+
+    block_t *chain;
+    char *data;
+    char *ptr;
+    char *end;
+
+    inline void init(int block_size = 256)
+    {
+        ++N;
+        chain = 0;
+        data = (char*) malloc(block_size);
+        ptr = data;
+        end = data + block_size;
+    }
+
+    inline void init0(int block_size)
+    {
+        init();
+        memset(data, '0', block_size);
+    }
+
+    inline void destroy()
+    {
+        --N;
+        if (chain) {
+            chain->destroy();
+            free(chain);
+        }
+
+        free(data);
+    }
+
+    inline void *allocate(size_t size, block_t **right_most)
+    {
+        const unsigned int block_size = 1 << 16;
+        if (end < ptr + size) {
+            assert( size < block_size );
+
+            if (!chain) {
+                chain = (block_t*) malloc(sizeof(block_t));
+                Q_ASSERT(chain);
+                chain->init(block_size);
+            }
+
+            return chain->allocate(size, right_most);
+        }
+
+        char *r = ptr;
+        ptr += size;
+
+        if (right_most)
+            *right_most = this;
+
+        return r;
+    }
+
+};
+
+// a stupid memory pool
+struct pool
+{
+    block_t blk;
+    block_t *right_most;
+
+    inline pool() { blk.init(); right_most = &blk; }
+    inline ~pool() { blk.destroy(); }
+
+    inline void *allocate(size_t size)
+    {
+        void *ptr = right_most->allocate(size, &right_most);
+        Q_ASSERT(ptr);
+        return ptr;
+
+    }
+    inline void *reallocate(void *old, size_t old_size, size_t size)
+    {
+        void *alloc = right_most->allocate(size, &right_most);
+        memcpy(alloc, old, old_size);
+        return alloc;
+    }
+private:
+   Q_DISABLE_COPY(pool)
+};
+
+/*
+    A memory pool that calls the destructor for each stored item when memory is
+    freed, at the expence storing one BaseType* per item.
+
+    Note that allocations for types that does not inherit BaseType
+    is not allowed and will result in a crash when the memory is freed.
+*/
+template <typename BaseType>
+class TypedPool
+{
+public:
+    inline TypedPool() { blk.init(); right_most = &blk; }
+    inline ~TypedPool()
+    {
+        foreach(BaseType *item, allocated)
+            item->~BaseType();
+        blk.destroy();
+    }
+
+    inline void *allocate(size_t size)
+    {
+        void *memory = right_most->allocate(size, &right_most);
+        allocated.append(reinterpret_cast<BaseType *>(memory));
+        Q_ASSERT(memory);
+        return memory;
+    }
+private:
+    Q_DISABLE_COPY(TypedPool)
+    block_t blk;
+    block_t *right_most;
+    QList<BaseType *> allocated;
+};
+
+struct SmallObject
+{
+    static void *operator new(size_t size);
+    static void operator delete(void *p);
+};
+
+QT_END_NAMESPACE
+
+#endif