mono/metadata/sgen-major-scan-object.h

   1 /*
   2  * Copyright 2001-2003 Ximian, Inc
   3  * Copyright 2003-2010 Novell, Inc.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining
   6  * a copy of this software and associated documentation files (the
   7  * "Software"), to deal in the Software without restriction, including
   8  * without limitation the rights to use, copy, modify, merge, publish,
   9  * distribute, sublicense, and/or sell copies of the Software, and to
  10  * permit persons to whom the Software is furnished to do so, subject to
  11  * the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be
  14  * included in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  17  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  18  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  19  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  20  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  21  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  22  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24 extern long long stat_scan_object_called_nursery;
  25 extern long long stat_scan_object_called_major;
  26
  27 #undef HANDLE_PTR
  28 #define HANDLE_PTR(ptr,obj)     do {    \
  29                 void *__old = *(ptr);   \
  30                 void *__copy;           \
  31                 if (__old) {    \
  32                         copy_object ((ptr), queue);     \
  33                         __copy = *(ptr);        \
  34                         DEBUG (9, if (__old != __copy) fprintf (gc_debug_file, "Overwrote field at %p with %p (was: %p)\n", (ptr), *(ptr), __old));     \
  35                         if (G_UNLIKELY (ptr_in_nursery (__copy) && !ptr_in_nursery ((ptr)))) \
  36                                 mono_sgen_add_to_global_remset (queue->allocator, (ptr));       \
  37                 }       \
  38         } while (0)
  39
  40 /*
  41  * Scan the object pointed to by @start for references to
  42  * other objects between @from_start and @from_end and copy
  43  * them to the gray_objects area.
  44  */
  45 static void
  46 minor_scan_object (char *start, SgenGrayQueue *queue)
  47 {
  48 #include "sgen-scan-object.h"
  49
  50         HEAVY_STAT (++stat_scan_object_called_nursery);
  51 }
  52
  53 /*
  54  * scan_vtype:
  55  *
  56  * Scan the valuetype pointed to by START, described by DESC for references to
  57  * other objects between @from_start and @from_end and copy them to the gray_objects area.
  58  * Returns a pointer to the end of the object.
  59  */
  60 static char*
  61 minor_scan_vtype (char *start, mword desc, char* from_start, char* from_end, SgenGrayQueue *queue)
  62 {
  63         size_t skip_size;
  64
  65         /* The descriptors include info about the MonoObject header as well */
  66         start -= sizeof (MonoObject);
  67
  68         switch (desc & 0x7) {
  69         case DESC_TYPE_RUN_LENGTH:
  70                 OBJ_RUN_LEN_FOREACH_PTR (desc,start);
  71                 OBJ_RUN_LEN_SIZE (skip_size, desc, start);
  72                 g_assert (skip_size);
  73                 return start + skip_size;
  74         case DESC_TYPE_SMALL_BITMAP:
  75                 OBJ_BITMAP_FOREACH_PTR (desc,start);
  76                 OBJ_BITMAP_SIZE (skip_size, desc, start);
  77                 return start + skip_size;
  78         case DESC_TYPE_LARGE_BITMAP:
  79         case DESC_TYPE_COMPLEX:
  80                 // FIXME:
  81                 g_assert_not_reached ();
  82                 break;
  83         default:
  84                 // The other descriptors can't happen with vtypes
  85                 g_assert_not_reached ();
  86                 break;
  87         }
  88         return NULL;
  89 }
  90
  91 #ifdef FIXED_HEAP
  92 #define PREFETCH_DYNAMIC_HEAP(addr)
  93 #else
  94 #define PREFETCH_DYNAMIC_HEAP(addr)     PREFETCH ((addr))
  95 #endif
  96
  97 #undef HANDLE_PTR
  98 #define HANDLE_PTR(ptr,obj)     do {                                    \
  99                 void *__old = *(ptr);                                   \
 100                 void *__copy;                                           \
 101                 if (__old) {                                            \
 102                         PREFETCH_DYNAMIC_HEAP (__old);                  \
 103                         major_copy_or_mark_object ((ptr), queue);       \
 104                         __copy = *(ptr);                                \
 105                         DEBUG (9, if (__old != __copy) mono_sgen_debug_printf (9, "Overwrote field at %p with %p (was: %p)\n", (ptr), *(ptr), __old)); \
 106                         if (G_UNLIKELY (ptr_in_nursery (__copy) && !ptr_in_nursery ((ptr)))) \
 107                                 mono_sgen_add_to_global_remset (queue->allocator, (ptr));       \
 108                 }                                                       \
 109         } while (0)
 110
 111 static void
 112 major_scan_object (char *start, SgenGrayQueue *queue)
 113 {
 114 #include "sgen-scan-object.h"
 115
 116         HEAVY_STAT (++stat_scan_object_called_major);
 117 }
 118
 119 #define FILL_COLLECTOR_SCAN_OBJECT(collector)   do {                    \
 120                 (collector)->major_scan_object = major_scan_object;     \
 121                 (collector)->minor_scan_object = minor_scan_object;     \
 122                 (collector)->minor_scan_vtype = minor_scan_vtype;       \
 123         } while (0)