/
sgen-pinning.c
137 lines (118 loc) · 4.2 KB
/
sgen-pinning.c
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/*
* Copyright 2001-2003 Ximian, Inc
* Copyright 2003-2010 Novell, Inc.
*
* 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.
*/
#define PIN_STAGING_AREA_SIZE 1024
static void* pin_staging_area [PIN_STAGING_AREA_SIZE];
static int pin_staging_area_index;
static void** pin_queue;
static int pin_queue_size = 0;
static int next_pin_slot = 0;
static void
init_pinning (void)
{
pin_staging_area_index = 0;
}
static void
realloc_pin_queue (void)
{
int new_size = pin_queue_size? pin_queue_size + pin_queue_size/2: 1024;
void **new_pin = mono_sgen_alloc_internal_dynamic (sizeof (void*) * new_size, INTERNAL_MEM_PIN_QUEUE);
memcpy (new_pin, pin_queue, sizeof (void*) * next_pin_slot);
mono_sgen_free_internal_dynamic (pin_queue, sizeof (void*) * pin_queue_size, INTERNAL_MEM_PIN_QUEUE);
pin_queue = new_pin;
pin_queue_size = new_size;
DEBUG (4, fprintf (gc_debug_file, "Reallocated pin queue to size: %d\n", new_size));
}
static void
evacuate_pin_staging_area (void)
{
int i;
g_assert (pin_staging_area_index >= 0 && pin_staging_area_index <= PIN_STAGING_AREA_SIZE);
if (pin_staging_area_index == 0)
return;
/*
* The pinning addresses might come from undefined memory, this is normal. Since they
* are used in lots of functions, we make the memory defined here instead of having
* to add a supression for those functions.
*/
VALGRIND_MAKE_MEM_DEFINED (pin_staging_area, pin_staging_area_index * sizeof (void*));
sort_addresses (pin_staging_area, pin_staging_area_index);
while (next_pin_slot + pin_staging_area_index > pin_queue_size)
realloc_pin_queue ();
pin_queue [next_pin_slot++] = pin_staging_area [0];
for (i = 1; i < pin_staging_area_index; ++i) {
void *p = pin_staging_area [i];
if (p != pin_queue [next_pin_slot - 1])
pin_queue [next_pin_slot++] = p;
}
g_assert (next_pin_slot <= pin_queue_size);
pin_staging_area_index = 0;
}
static void
pin_stage_ptr (void *ptr)
{
if (pin_staging_area_index >= PIN_STAGING_AREA_SIZE)
evacuate_pin_staging_area ();
pin_staging_area [pin_staging_area_index++] = ptr;
}
static int
optimized_pin_queue_search (void *addr)
{
int first = 0, last = next_pin_slot;
while (first < last) {
int middle = first + ((last - first) >> 1);
if (addr <= pin_queue [middle])
last = middle;
else
first = middle + 1;
}
g_assert (first == last);
return first;
}
static void
find_optimized_pin_queue_area (void *start, void *end, int *first, int *last)
{
*first = optimized_pin_queue_search (start);
*last = optimized_pin_queue_search (end);
}
void**
mono_sgen_find_optimized_pin_queue_area (void *start, void *end, int *num)
{
int first, last;
find_optimized_pin_queue_area (start, end, &first, &last);
*num = last - first;
if (first == last)
return NULL;
return pin_queue + first;
}
static void
find_section_pin_queue_start_end (GCMemSection *section)
{
int start, end;
DEBUG (6, fprintf (gc_debug_file, "Pinning from section %p (%p-%p)\n", section, section->data, section->end_data));
find_optimized_pin_queue_area (section->data, section->end_data, &start, &end);
DEBUG (6, fprintf (gc_debug_file, "Found %d pinning addresses in section %p (%d-%d)\n",
end - start, section, start, end));
section->pin_queue_start = start;
section->pin_queue_end = end;
}