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/*
* sgen-scan-object.h: Generic object scan.
*
* Copyright 2001-2003 Ximian, Inc
* Copyright 2003-2010 Novell, Inc.
* Copyright (C) 2013 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.
*
*
* Scans one object, using the OBJ_XXX macros. The start of the
* object must be given in the variable "char* start". Afterwards,
* "start" will point to the start of the next object, if the scanned
* object contained references. If not, the value of "start" should
* be considered undefined after executing this code. The object's
* GC descriptor must be in the variable "mword desc".
*
* The macro `HANDLE_PTR` will be invoked for every reference encountered while scanning the
* object. It is called with two parameters: The pointer to the reference (not the
* reference itself!) as well as the pointer to the scanned object.
*
* Modifiers (automatically undefined):
*
* SCAN_OBJECT_NOSCAN - if defined, don't actually scan the object,
* i.e. don't invoke the OBJ_XXX macros.
*
* SCAN_OBJECT_NOVTABLE - desc is provided by the includer, instead of
* vt. Complex arrays cannot not be scanned.
*
* SCAN_OBJECT_PROTOCOL - if defined, binary protocol the scan.
* Should only be used for scanning that's done for the actual
* collection, not for debugging scans.
*/
{
#ifndef SCAN_OBJECT_NOVTABLE
#if defined(SGEN_HEAVY_BINARY_PROTOCOL) && defined(SCAN_OBJECT_PROTOCOL)
binary_protocol_scan_begin (start, SGEN_LOAD_VTABLE (start), sgen_safe_object_get_size ((MonoObject*)start));
#endif
#else
#if defined(SGEN_HEAVY_BINARY_PROTOCOL) && defined(SCAN_OBJECT_PROTOCOL)
binary_protocol_scan_vtype_begin (start + sizeof (MonoObject), size);
#endif
#endif
switch (desc & DESC_TYPE_MASK) {
case DESC_TYPE_RUN_LENGTH:
#define SCAN OBJ_RUN_LEN_FOREACH_PTR (desc, start)
#ifndef SCAN_OBJECT_NOSCAN
SCAN;
#endif
#undef SCAN
break;
case DESC_TYPE_VECTOR:
#define SCAN OBJ_VECTOR_FOREACH_PTR (desc, start)
#ifndef SCAN_OBJECT_NOSCAN
SCAN;
#endif
#undef SCAN
break;
case DESC_TYPE_BITMAP:
#define SCAN OBJ_BITMAP_FOREACH_PTR (desc, start)
#ifndef SCAN_OBJECT_NOSCAN
SCAN;
#endif
#undef SCAN
break;
case DESC_TYPE_COMPLEX:
/* this is a complex object */
#define SCAN OBJ_COMPLEX_FOREACH_PTR (desc, start)
#ifndef SCAN_OBJECT_NOSCAN
SCAN;
#endif
#undef SCAN
break;
#ifndef SCAN_OBJECT_NOVTABLE
case DESC_TYPE_COMPLEX_ARR:
/* this is an array of complex structs */
#define SCAN OBJ_COMPLEX_ARR_FOREACH_PTR (desc, start)
#ifndef SCAN_OBJECT_NOSCAN
SCAN;
#endif
#undef SCAN
break;
#endif
case DESC_TYPE_SMALL_PTRFREE:
case DESC_TYPE_COMPLEX_PTRFREE:
/*Nothing to do*/
break;
default:
g_assert_not_reached ();
}
}
#undef SCAN_OBJECT_NOSCAN
#undef SCAN_OBJECT_NOVTABLE
#undef SCAN_OBJECT_PROTOCOL
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