mono/sgen/sgen-minor-scan-object.h

   1 /**
   2  * \file
   3  * Object scanning in the nursery collectors.
   4  *
   5  * Copyright 2001-2003 Ximian, Inc
   6  * Copyright 2003-2010 Novell, Inc.
   7  * Copyright (C) 2012 Xamarin Inc
   8  *
   9  * Licensed under the MIT license. See LICENSE file in the project root for full license information.
  10  */
  11
  12 extern guint64 stat_scan_object_called_nursery;
  13
  14 #undef SERIAL_SCAN_OBJECT
  15 #undef SERIAL_SCAN_VTYPE
  16 #undef SERIAL_SCAN_PTR_FIELD
  17 #undef SERIAL_DRAIN_GRAY_STACK
  18
  19 #if defined(SGEN_SIMPLE_NURSERY)
  20
  21 #ifdef SGEN_SIMPLE_PAR_NURSERY
  22 #ifdef SGEN_CONCURRENT_MAJOR
  23 #define SERIAL_SCAN_OBJECT simple_par_nursery_serial_with_concurrent_major_scan_object
  24 #define SERIAL_SCAN_VTYPE simple_par_nursery_serial_with_concurrent_major_scan_vtype
  25 #define SERIAL_SCAN_PTR_FIELD simple_par_nursery_serial_with_concurrent_major_scan_ptr_field
  26 #define SERIAL_DRAIN_GRAY_STACK simple_par_nursery_serial_with_concurrent_major_drain_gray_stack
  27 #else
  28 #define SERIAL_SCAN_OBJECT simple_par_nursery_serial_scan_object
  29 #define SERIAL_SCAN_VTYPE simple_par_nursery_serial_scan_vtype
  30 #define SERIAL_SCAN_PTR_FIELD simple_par_nursery_serial_scan_ptr_field
  31 #define SERIAL_DRAIN_GRAY_STACK simple_par_nursery_serial_drain_gray_stack
  32 #endif
  33 #else
  34 #ifdef SGEN_CONCURRENT_MAJOR
  35 #define SERIAL_SCAN_OBJECT simple_nursery_serial_with_concurrent_major_scan_object
  36 #define SERIAL_SCAN_VTYPE simple_nursery_serial_with_concurrent_major_scan_vtype
  37 #define SERIAL_SCAN_PTR_FIELD simple_nursery_serial_with_concurrent_major_scan_ptr_field
  38 #define SERIAL_DRAIN_GRAY_STACK simple_nursery_serial_with_concurrent_major_drain_gray_stack
  39 #else
  40 #define SERIAL_SCAN_OBJECT simple_nursery_serial_scan_object
  41 #define SERIAL_SCAN_VTYPE simple_nursery_serial_scan_vtype
  42 #define SERIAL_SCAN_PTR_FIELD simple_nursery_serial_scan_ptr_field
  43 #define SERIAL_DRAIN_GRAY_STACK simple_nursery_serial_drain_gray_stack
  44 #endif
  45 #endif
  46
  47 #elif defined (SGEN_SPLIT_NURSERY)
  48
  49 #ifdef SGEN_CONCURRENT_MAJOR
  50 #define SERIAL_SCAN_OBJECT split_nursery_serial_with_concurrent_major_scan_object
  51 #define SERIAL_SCAN_VTYPE split_nursery_serial_with_concurrent_major_scan_vtype
  52 #define SERIAL_SCAN_PTR_FIELD split_nursery_serial_with_concurrent_major_scan_ptr_field
  53 #define SERIAL_DRAIN_GRAY_STACK split_nursery_serial_with_concurrent_major_drain_gray_stack
  54 #else
  55 #define SERIAL_SCAN_OBJECT split_nursery_serial_scan_object
  56 #define SERIAL_SCAN_VTYPE split_nursery_serial_scan_vtype
  57 #define SERIAL_SCAN_PTR_FIELD split_nursery_serial_scan_ptr_field
  58 #define SERIAL_DRAIN_GRAY_STACK split_nursery_serial_drain_gray_stack
  59 #endif
  60
  61 #else
  62 #error "No nursery configuration specified"
  63 #endif
  64
  65 #undef HANDLE_PTR
  66 /* Global remsets are handled in SERIAL_COPY_OBJECT_FROM_OBJ */
  67 #define HANDLE_PTR(ptr,obj)     do {    \
  68                 void *__old = *(ptr);   \
  69                 SGEN_OBJECT_LAYOUT_STATISTICS_MARK_BITMAP ((obj), (ptr)); \
  70                 binary_protocol_scan_process_reference ((full_object), (ptr), __old); \
  71                 if (__old) {    \
  72                         SERIAL_COPY_OBJECT_FROM_OBJ ((ptr), queue);     \
  73                         SGEN_COND_LOG (9, __old != *(ptr), "Overwrote field at %p with %p (was: %p)", (ptr), *(ptr), __old); \
  74                 }       \
  75         } while (0)
  76
  77 static void
  78 SERIAL_SCAN_OBJECT (GCObject *full_object, SgenDescriptor desc, SgenGrayQueue *queue)
  79 {
  80         char *start = (char*)full_object;
  81
  82         SGEN_OBJECT_LAYOUT_STATISTICS_DECLARE_BITMAP;
  83
  84 #ifdef HEAVY_STATISTICS
  85         sgen_descriptor_count_scanned_object (desc);
  86 #endif
  87
  88         SGEN_ASSERT (9, sgen_get_current_collection_generation () == GENERATION_NURSERY, "Must not use minor scan during major collection.");
  89
  90 #define SCAN_OBJECT_PROTOCOL
  91 #include "sgen-scan-object.h"
  92
  93         SGEN_OBJECT_LAYOUT_STATISTICS_COMMIT_BITMAP;
  94         HEAVY_STAT (++stat_scan_object_called_nursery);
  95 }
  96
  97 static void
  98 SERIAL_SCAN_VTYPE (GCObject *full_object, char *start, SgenDescriptor desc, SgenGrayQueue *queue BINARY_PROTOCOL_ARG (size_t size))
  99 {
 100         SGEN_OBJECT_LAYOUT_STATISTICS_DECLARE_BITMAP;
 101
 102         SGEN_ASSERT (9, sgen_get_current_collection_generation () == GENERATION_NURSERY, "Must not use minor scan during major collection.");
 103
 104         /* The descriptors include info about the MonoObject header as well */
 105         start -= SGEN_CLIENT_OBJECT_HEADER_SIZE;
 106
 107 #define SCAN_OBJECT_NOVTABLE
 108 #define SCAN_OBJECT_PROTOCOL
 109 #include "sgen-scan-object.h"
 110 }
 111
 112 static void
 113 SERIAL_SCAN_PTR_FIELD (GCObject *full_object, GCObject **ptr, SgenGrayQueue *queue)
 114 {
 115         HANDLE_PTR (ptr, NULL);
 116 }
 117
 118 static gboolean
 119 SERIAL_DRAIN_GRAY_STACK (SgenGrayQueue *queue)
 120 {
 121 #ifdef SGEN_SIMPLE_PAR_NURSERY
 122         int i;
 123         /*
 124          * We do bounded iteration so we can switch to optimized context
 125          * when we are the last worker remaining.
 126          */
 127         for (i = 0; i < 32; i++) {
 128 #else
 129         for (;;) {
 130 #endif
 131                 GCObject *obj;
 132                 SgenDescriptor desc;
 133
 134 #ifdef SGEN_SIMPLE_PAR_NURSERY
 135                 GRAY_OBJECT_DEQUEUE_PARALLEL (queue, &obj, &desc);
 136 #else
 137                 GRAY_OBJECT_DEQUEUE_SERIAL (queue, &obj, &desc);
 138 #endif
 139                 if (!obj)
 140                         return TRUE;
 141
 142                 SERIAL_SCAN_OBJECT (obj, desc, queue);
 143         }
 144
 145         return FALSE;
 146 }
 147
 148 #define FILL_MINOR_COLLECTOR_SCAN_OBJECT(ops)   do {                    \
 149                 (ops)->scan_object = SERIAL_SCAN_OBJECT;                        \
 150                 (ops)->scan_vtype = SERIAL_SCAN_VTYPE;                  \
 151                 (ops)->scan_ptr_field = SERIAL_SCAN_PTR_FIELD;          \
 152                 (ops)->drain_gray_stack = SERIAL_DRAIN_GRAY_STACK;      \
 153         } while (0)