[sgen] Move the independent parts of SGen to a separate library.

[mono.git] / mono / sgen / sgen-copy-object.h

diff --git a/mono/sgen/sgen-copy-object.h b/mono/sgen/sgen-copy-object.h
new file mode 100644 (file)
index 0000000..99fd0cc
--- /dev/null
+++ b/mono/sgen/sgen-copy-object.h
@@ -0,0 +1,86 @@
+/*
+ * sgen-copy-object.h: This is where objects are copied.
+ *
+ * Copyright 2001-2003 Ximian, Inc
+ * Copyright 2003-2010 Novell, Inc.
+ * Copyright (C) 2012 Xamarin Inc
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License 2.0 as published by the Free Software Foundation;
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License 2.0 along with this library; if not, write to the Free
+ * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+extern guint64 stat_copy_object_called_nursery;
+extern guint64 stat_objects_copied_nursery;
+
+extern guint64 stat_nursery_copy_object_failed_from_space;
+extern guint64 stat_nursery_copy_object_failed_forwarded;
+extern guint64 stat_nursery_copy_object_failed_pinned;
+
+extern guint64 stat_slots_allocated_in_vain;
+
+/*
+ * Copies an object and enqueues it if a queue is given.
+ *
+ * This function can be used even if the vtable of obj is not valid
+ * anymore, which is the case in the parallel collector.
+ */
+static MONO_ALWAYS_INLINE void
+par_copy_object_no_checks (char *destination, GCVTable *vt, void *obj, mword objsize, SgenGrayQueue *queue)
+{
+       sgen_client_pre_copy_checks (destination, vt, obj, objsize);
+       binary_protocol_copy (obj, destination, vt, objsize);
+
+       /* FIXME: assumes object layout */
+       memcpy (destination + sizeof (mword), (char*)obj + sizeof (mword), objsize - sizeof (mword));
+
+       /* adjust array->bounds */
+       SGEN_ASSERT (9, sgen_vtable_get_descriptor (vt), "vtable %p has no gc descriptor", vt);
+
+       sgen_client_update_copied_object (destination, vt, obj, objsize);
+       obj = destination;
+       if (queue) {
+               SGEN_LOG (9, "Enqueuing gray object %p (%s)", obj, sgen_client_vtable_get_name (vt));
+               GRAY_OBJECT_ENQUEUE (queue, obj, sgen_vtable_get_descriptor (vt));
+       }
+}
+
+/*
+ * This can return OBJ itself on OOM.
+ */
+static MONO_NEVER_INLINE void*
+copy_object_no_checks (void *obj, SgenGrayQueue *queue)
+{
+       GCVTable *vt = SGEN_LOAD_VTABLE_UNCHECKED (obj);
+       gboolean has_references = SGEN_VTABLE_HAS_REFERENCES (vt);
+       mword objsize = SGEN_ALIGN_UP (sgen_client_par_object_get_size (vt, obj));
+       /* FIXME: Does this not mark the newly allocated object? */
+       char *destination = COLLECTOR_SERIAL_ALLOC_FOR_PROMOTION (vt, obj, objsize, has_references);
+
+       if (G_UNLIKELY (!destination)) {
+               /* FIXME: Is this path ever tested? */
+               collector_pin_object (obj, queue);
+               sgen_set_pinned_from_failed_allocation (objsize);
+               return obj;
+       }
+
+       if (!has_references)
+               queue = NULL;
+
+       par_copy_object_no_checks (destination, vt, obj, objsize, queue);
+       /* FIXME: mark mod union cards if necessary */
+
+       /* set the forwarding pointer */
+       SGEN_FORWARD_OBJECT (obj, destination);
+
+       return destination;
+}