mono/metadata/sgen-pinning.c

   1 #define PIN_STAGING_AREA_SIZE   1024
   2
   3 static void* pin_staging_area [PIN_STAGING_AREA_SIZE];
   4 static int pin_staging_area_index;
   5
   6 static void
   7 init_pinning (void)
   8 {
   9         pin_staging_area_index = 0;
  10 }
  11
  12 static void
  13 evacuate_pin_staging_area (void)
  14 {
  15         int i;
  16
  17         g_assert (pin_staging_area_index >= 0 && pin_staging_area_index <= PIN_STAGING_AREA_SIZE);
  18
  19         if (pin_staging_area_index == 0)
  20                 return;
  21
  22         /*
  23          * The pinning addresses might come from undefined memory, this is normal. Since they
  24          * are used in lots of functions, we make the memory defined here instead of having
  25          * to add a supression for those functions.
  26          */
  27         VALGRIND_MAKE_MEM_DEFINED (pin_staging_area, pin_staging_area_index * sizeof (void*));
  28
  29         sort_addresses (pin_staging_area, pin_staging_area_index);
  30
  31         while (next_pin_slot + pin_staging_area_index > pin_queue_size)
  32                 realloc_pin_queue ();
  33
  34         pin_queue [next_pin_slot++] = pin_staging_area [0];
  35         for (i = 1; i < pin_staging_area_index; ++i) {
  36                 void *p = pin_staging_area [i];
  37                 if (p != pin_queue [next_pin_slot - 1])
  38                         pin_queue [next_pin_slot++] = p;
  39         }
  40
  41         g_assert (next_pin_slot <= pin_queue_size);
  42
  43         pin_staging_area_index = 0;
  44 }
  45
  46 static void
  47 pin_stage_ptr (void *ptr)
  48 {
  49         if (pin_staging_area_index >= PIN_STAGING_AREA_SIZE)
  50                 evacuate_pin_staging_area ();
  51
  52         pin_staging_area [pin_staging_area_index++] = ptr;
  53 }