--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/druntime/src/gc/basic/gc.d	Tue Jun 02 17:43:06 2009 +0100
@@ -0,0 +1,315 @@
+/**
+ * Contains the external GC interface.
+ *
+ * Copyright: Copyright Digital Mars 2005 - 2009.
+ * License:   <a href="http://www.boost.org/LICENSE_1_0.txt>Boost License 1.0</a>.
+ * Authors:   Walter Bright, Sean Kelly
+ *
+ *          Copyright Digital Mars 2005 - 2009.
+ * Distributed under the Boost Software License, Version 1.0.
+ *    (See accompanying file LICENSE_1_0.txt or copy at
+ *          http://www.boost.org/LICENSE_1_0.txt)
+ */
+module gc.gc;
+
+private
+{
+    import gc.gcx;
+    import gc.gcstats;
+    import core.stdc.stdlib;
+
+    version = GCCLASS;
+
+    version( GCCLASS )
+        alias GC gc_t;
+    else
+        alias GC* gc_t;
+
+    __gshared gc_t _gc;
+
+    extern (C) void thread_init();
+
+    struct Proxy
+    {
+        extern (C) void function() gc_enable;
+        extern (C) void function() gc_disable;
+        extern (C) void function() gc_collect;
+        extern (C) void function() gc_minimize;
+
+        extern (C) uint function(void*) gc_getAttr;
+        extern (C) uint function(void*, uint) gc_setAttr;
+        extern (C) uint function(void*, uint) gc_clrAttr;
+
+        extern (C) void*  function(size_t, uint) gc_malloc;
+        extern (C) void*  function(size_t, uint) gc_calloc;
+        extern (C) void*  function(void*, size_t, uint ba) gc_realloc;
+        extern (C) size_t function(void*, size_t, size_t) gc_extend;
+        extern (C) size_t function(size_t) gc_reserve;
+        extern (C) void   function(void*) gc_free;
+
+        extern (C) void*   function(void*) gc_addrOf;
+        extern (C) size_t  function(void*) gc_sizeOf;
+
+        extern (C) BlkInfo function(void*) gc_query;
+
+        extern (C) void function(void*) gc_addRoot;
+        extern (C) void function(void*, size_t) gc_addRange;
+
+        extern (C) void function(void*) gc_removeRoot;
+        extern (C) void function(void*) gc_removeRange;
+    }
+
+    __gshared Proxy  pthis;
+    __gshared Proxy* proxy;
+
+    void initProxy()
+    {
+        pthis.gc_enable = &gc_enable;
+        pthis.gc_disable = &gc_disable;
+        pthis.gc_collect = &gc_collect;
+        pthis.gc_minimize = &gc_minimize;
+
+        pthis.gc_getAttr = &gc_getAttr;
+        pthis.gc_setAttr = &gc_setAttr;
+        pthis.gc_clrAttr = &gc_clrAttr;
+
+        pthis.gc_malloc = &gc_malloc;
+        pthis.gc_calloc = &gc_calloc;
+        pthis.gc_realloc = &gc_realloc;
+        pthis.gc_extend = &gc_extend;
+        pthis.gc_reserve = &gc_reserve;
+        pthis.gc_free = &gc_free;
+
+        pthis.gc_addrOf = &gc_addrOf;
+        pthis.gc_sizeOf = &gc_sizeOf;
+
+        pthis.gc_query = &gc_query;
+
+        pthis.gc_addRoot = &gc_addRoot;
+        pthis.gc_addRange = &gc_addRange;
+
+        pthis.gc_removeRoot = &gc_removeRoot;
+        pthis.gc_removeRange = &gc_removeRange;
+    }
+}
+
+extern (C) void gc_init()
+{
+    version (GCCLASS)
+    {   void* p;
+        ClassInfo ci = GC.classinfo;
+
+        p = malloc(ci.init.length);
+        (cast(byte*)p)[0 .. ci.init.length] = ci.init[];
+        _gc = cast(GC)p;
+    }
+    else
+    {
+        _gc = cast(GC*) calloc(1, GC.sizeof);
+    }
+    _gc.initialize();
+    // NOTE: The GC must initialize the thread library
+    //       before its first collection.
+    thread_init();
+    initProxy();
+}
+
+extern (C) void gc_term()
+{
+    // NOTE: There may be daemons threads still running when this routine is
+    //       called.  If so, cleaning memory out from under then is a good
+    //       way to make them crash horribly.  This probably doesn't matter
+    //       much since the app is supposed to be shutting down anyway, but
+    //       I'm disabling cleanup for now until I can think about it some
+    //       more.
+    //
+    // NOTE: Due to popular demand, this has been re-enabled.  It still has
+    //       the problems mentioned above though, so I guess we'll see.
+    _gc.fullCollectNoStack(); // not really a 'collect all' -- still scans
+                              // static data area, roots, and ranges.
+    _gc.Dtor();
+}
+
+extern (C) void gc_enable()
+{
+    if( proxy is null )
+        return _gc.enable();
+    return proxy.gc_enable();
+}
+
+extern (C) void gc_disable()
+{
+    if( proxy is null )
+        return _gc.disable();
+    return proxy.gc_disable();
+}
+
+extern (C) void gc_collect()
+{
+    if( proxy is null )
+        return _gc.fullCollect();
+    return proxy.gc_collect();
+}
+
+
+extern (C) void gc_minimize()
+{
+    if( proxy is null )
+        return _gc.minimize();
+    return proxy.gc_minimize();
+}
+
+extern (C) uint gc_getAttr( void* p )
+{
+    if( proxy is null )
+        return _gc.getAttr( p );
+    return proxy.gc_getAttr( p );
+}
+
+extern (C) uint gc_setAttr( void* p, uint a )
+{
+    if( proxy is null )
+        return _gc.setAttr( p, a );
+    return proxy.gc_setAttr( p, a );
+}
+
+extern (C) uint gc_clrAttr( void* p, uint a )
+{
+    if( proxy is null )
+        return _gc.clrAttr( p, a );
+    return proxy.gc_clrAttr( p, a );
+}
+
+extern (C) void* gc_malloc( size_t sz, uint ba = 0 )
+{
+    if( proxy is null )
+        return _gc.malloc( sz, ba );
+    return proxy.gc_malloc( sz, ba );
+}
+
+extern (C) void* gc_calloc( size_t sz, uint ba = 0 )
+{
+    if( proxy is null )
+        return _gc.calloc( sz, ba );
+    return proxy.gc_calloc( sz, ba );
+}
+
+extern (C) void* gc_realloc( void* p, size_t sz, uint ba = 0 )
+{
+    if( proxy is null )
+        return _gc.realloc( p, sz, ba );
+    return proxy.gc_realloc( p, sz, ba );
+}
+
+extern (C) size_t gc_extend( void* p, size_t mx, size_t sz )
+{
+    if( proxy is null )
+        return _gc.extend( p, mx, sz );
+    return proxy.gc_extend( p, mx, sz );
+}
+
+extern (C) size_t gc_reserve( size_t sz )
+{
+    if( proxy is null )
+        return _gc.reserve( sz );
+    return proxy.gc_reserve( sz );
+}
+
+extern (C) void gc_free( void* p )
+{
+    if( proxy is null )
+        return _gc.free( p );
+    return proxy.gc_free( p );
+}
+
+extern (C) void* gc_addrOf( void* p )
+{
+    if( proxy is null )
+        return _gc.addrOf( p );
+    return proxy.gc_addrOf( p );
+}
+
+extern (C) size_t gc_sizeOf( void* p )
+{
+    if( proxy is null )
+        return _gc.sizeOf( p );
+    return proxy.gc_sizeOf( p );
+}
+
+extern (C) BlkInfo gc_query( void* p )
+{
+    if( proxy is null )
+        return _gc.query( p );
+    return proxy.gc_query( p );
+}
+
+// NOTE: This routine is experimental.  The stats or function name may change
+//       before it is made officially available.
+extern (C) GCStats gc_stats()
+{
+    if( proxy is null )
+    {
+        GCStats stats = void;
+        _gc.getStats( stats );
+        return stats;
+    }
+    // TODO: Add proxy support for this once the layout of GCStats is
+    //       finalized.
+    //return proxy.gc_stats();
+    return GCStats.init;
+}
+
+extern (C) void gc_addRoot( void* p )
+{
+    if( proxy is null )
+        return _gc.addRoot( p );
+    return proxy.gc_addRoot( p );
+}
+
+extern (C) void gc_addRange( void* p, size_t sz )
+{
+    if( proxy is null )
+        return _gc.addRange( p, sz );
+    return proxy.gc_addRange( p, sz );
+}
+
+extern (C) void gc_removeRoot( void* p )
+{
+    if( proxy is null )
+        return _gc.removeRoot( p );
+    return proxy.gc_removeRoot( p );
+}
+
+extern (C) void gc_removeRange( void* p )
+{
+    if( proxy is null )
+        return _gc.removeRange( p );
+    return proxy.gc_removeRange( p );
+}
+
+extern (C) Proxy* gc_getProxy()
+{
+    return &pthis;
+}
+
+export extern (C) void gc_setProxy( Proxy* p )
+{
+    if( proxy !is null )
+    {
+        // TODO: Decide if this is an error condition.
+    }
+    proxy = p;
+    foreach( r; _gc.rootIter )
+        proxy.gc_addRoot( r );
+    foreach( r; _gc.rangeIter )
+        proxy.gc_addRange( r.pbot, r.ptop - r.pbot );
+}
+
+export extern (C) void gc_clrProxy()
+{
+    foreach( r; _gc.rangeIter )
+        proxy.gc_removeRange( r.pbot );
+    foreach( r; _gc.rootIter )
+        proxy.gc_removeRoot( r );
+    proxy = null;
+}