/*
+ * sgen-descriptor.h: GC descriptors describe object layout.
+
* Copyright 2001-2003 Ximian, Inc
* Copyright 2003-2010 Novell, Inc.
* Copyright 2011 Xamarin Inc (http://www.xamarin.com)
- *
- * Permission is hereby granted, free of charge, to any person obtaining
- * a copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, sublicense, and/or sell copies of the Software, and to
- * permit persons to whom the Software is furnished to do so, subject to
- * the following conditions:
- *
- * The above copyright notice and this permission notice shall be
- * included in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
- * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
- * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
- * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * 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.
*/
#ifndef __MONO_SGEN_DESCRIPTOR_H__
#define __MONO_SGEN_DESCRIPTOR_H__
#define SGEN_VTABLE_HAS_REFERENCES(vt) (sgen_gc_descr_has_references ((mword)((MonoVTable*)(vt))->gc_descr))
#define SGEN_CLASS_HAS_REFERENCES(c) (sgen_gc_descr_has_references ((mword)(c)->gc_descr))
+#define SGEN_OBJECT_HAS_REFERENCES(o) (SGEN_VTABLE_HAS_REFERENCES (SGEN_LOAD_VTABLE ((o))))
/* helper macros to scan and traverse objects, macros because we resue them in many functions */
#define OBJ_RUN_LEN_SIZE(size,desc,obj) do { \
#define PREFETCH(addr)
#endif
+#if defined(__GNUC__) && SIZEOF_VOID_P==4
+#define GNUC_BUILTIN_CTZ(bmap) __builtin_ctz(bmap)
+#elif defined(__GNUC__) && SIZEOF_VOID_P==8
+#define GNUC_BUILTIN_CTZ(bmap) __builtin_ctzl(bmap)
+#endif
+
/* code using these macros must define a HANDLE_PTR(ptr) macro that does the work */
#define OBJ_RUN_LEN_FOREACH_PTR(desc,obj) do { \
if ((desc) & 0xffff0000) { \
void **_objptr = (void**)(obj); \
_objptr += ((desc) >> 16) & 0xff; \
_objptr_end = _objptr + (((desc) >> 24) & 0xff); \
+ HANDLE_PTR (_objptr, (obj)); \
+ _objptr ++; \
while (_objptr < _objptr_end) { \
HANDLE_PTR (_objptr, (obj)); \
_objptr++; \
} \
} while (0)
+#if defined(__GNUC__)
#define OBJ_BITMAP_FOREACH_PTR(desc,obj) do { \
/* there are pointers */ \
void **_objptr = (void**)(obj); \
gsize _bmap = (desc) >> 16; \
_objptr += OBJECT_HEADER_WORDS; \
+ { \
+ int _index = GNUC_BUILTIN_CTZ (_bmap); \
+ _objptr += _index; \
+ _bmap >>= (_index + 1); \
+ HANDLE_PTR (_objptr, (obj)); \
+ _objptr ++; \
+ } \
while (_bmap) { \
- if ((_bmap & 1)) { \
- HANDLE_PTR (_objptr, (obj)); \
- } \
- _bmap >>= 1; \
- ++_objptr; \
- } \
+ int _index = GNUC_BUILTIN_CTZ (_bmap); \
+ _objptr += _index; \
+ _bmap >>= (_index + 1); \
+ HANDLE_PTR (_objptr, (obj)); \
+ _objptr ++; \
+ } \
+ } while (0)
+#else
+#define OBJ_BITMAP_FOREACH_PTR(desc,obj) do { \
+ /* there are pointers */ \
+ void **_objptr = (void**)(obj); \
+ gsize _bmap = (desc) >> 16; \
+ _objptr += OBJECT_HEADER_WORDS; \
+ while (_bmap) { \
+ if ((_bmap & 1)) { \
+ HANDLE_PTR (_objptr, (obj)); \
+ } \
+ _bmap >>= 1; \
+ ++_objptr; \
+ } \
} while (0)
+#endif
/* a bitmap desc means that there are pointer references or we'd have
* choosen run-length, instead: add an assert to check.
} while (0)
-#endif
\ No newline at end of file
+#endif
projects / mono.git / blobdiff