lua: Switch memory allocator from dl to tlsf

Instead of providing yet another memory allocator implementation
use tlsf and simply link tlsf library.

Another small improvement is to *grow* memory pool by grabbing
audiobuffer instead of just switching to use audiobuf exclusively.
Tested with simple lua 'memory eater' script.

This patch extends tlsf lib slightly. You can provide
void *get_new_area(size_t * size) function which will override
weak dummy implementation provided in lib itself. This allows to
automaticaly initialize memory pool as well as grow memory
pool if needed (for example grab audiobuffer when pluginbuffer
is exhaused).

Change-Id: I841af6b6b5bbbf546c14cbf139a7723fbb982f1b

1 files changed, 48 insertions, 0 deletions

diff --git a/apps/plugins/lua/tlsf_helper.c b/apps/plugins/lua/tlsf_helper.c
new file mode 100644
index 0000000000..edf32eecf9
--- /dev/null
+++ b/apps/plugins/lua/tlsf_helper.c
@@ -0,0 +1,48 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ *
+ * Copyright (C) 2013 Marcin Bukat
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include "plugin.h"
+#include <tlsf.h>
+
+void *get_new_area(size_t *size)
+{
+    static char *pluginbuf_ptr = NULL;
+    static char *audiobuf_ptr = NULL;
+
+    if (pluginbuf_ptr == NULL)
+    {
+        pluginbuf_ptr = rb->plugin_get_buffer(size);
+
+        /* kill tlsf signature if any */
+        memset(pluginbuf_ptr, 0, 4);
+
+        return pluginbuf_ptr;
+    }
+
+    if (audiobuf_ptr == NULL)
+    {
+        /* grab audiobuffer */
+        audiobuf_ptr = rb->plugin_get_audio_buffer(size);
+
+        return audiobuf_ptr;
+    }
+
+    return ((void *) ~0);
+}