96 lines
2.4 KiB
C++
96 lines
2.4 KiB
C++
#include "master.hpp"
|
|
|
|
namespace factor
|
|
{
|
|
|
|
object_start_map::object_start_map(cell size_, cell start_) :
|
|
size(size_), start(start_)
|
|
{
|
|
object_start_offsets = new card[addr_to_card(size_)];
|
|
object_start_offsets_end = object_start_offsets + addr_to_card(size_);
|
|
clear_object_start_offsets();
|
|
}
|
|
|
|
object_start_map::~object_start_map()
|
|
{
|
|
delete[] object_start_offsets;
|
|
}
|
|
|
|
cell object_start_map::first_object_in_card(cell card_index)
|
|
{
|
|
return object_start_offsets[card_index];
|
|
}
|
|
|
|
cell object_start_map::find_object_containing_card(cell card_index)
|
|
{
|
|
if(card_index == 0)
|
|
return start;
|
|
else
|
|
{
|
|
card_index--;
|
|
|
|
while(first_object_in_card(card_index) == card_starts_inside_object)
|
|
{
|
|
#ifdef FACTOR_DEBUG
|
|
/* First card should start with an object */
|
|
FACTOR_ASSERT(card_index > 0);
|
|
#endif
|
|
card_index--;
|
|
}
|
|
|
|
return start + (card_index << card_bits) + first_object_in_card(card_index);
|
|
}
|
|
}
|
|
|
|
/* we need to remember the first object allocated in the card */
|
|
void object_start_map::record_object_start_offset(object *obj)
|
|
{
|
|
cell idx = addr_to_card((cell)obj - start);
|
|
card obj_start = ((cell)obj & addr_card_mask);
|
|
object_start_offsets[idx] = std::min(object_start_offsets[idx],obj_start);
|
|
}
|
|
|
|
void object_start_map::clear_object_start_offsets()
|
|
{
|
|
memset(object_start_offsets,card_starts_inside_object,addr_to_card(size));
|
|
}
|
|
|
|
void object_start_map::update_card_for_sweep(cell index, u16 mask)
|
|
{
|
|
cell offset = object_start_offsets[index];
|
|
if(offset != card_starts_inside_object)
|
|
{
|
|
mask >>= (offset / data_alignment);
|
|
|
|
if(mask == 0)
|
|
{
|
|
/* The rest of the block after the old object start is free */
|
|
object_start_offsets[index] = card_starts_inside_object;
|
|
}
|
|
else
|
|
{
|
|
/* Move the object start forward if necessary */
|
|
object_start_offsets[index] = (card)(offset + (rightmost_set_bit(mask) * data_alignment));
|
|
}
|
|
}
|
|
}
|
|
|
|
void object_start_map::update_for_sweep(mark_bits<object> *state)
|
|
{
|
|
for(cell index = 0; index < state->bits_size; index++)
|
|
{
|
|
cell mask = state->marked[index];
|
|
#ifdef FACTOR_64
|
|
update_card_for_sweep(index * 4, mask & 0xffff);
|
|
update_card_for_sweep(index * 4 + 1, (mask >> 16) & 0xffff);
|
|
update_card_for_sweep(index * 4 + 2, (mask >> 32) & 0xffff);
|
|
update_card_for_sweep(index * 4 + 3, (mask >> 48) & 0xffff);
|
|
#else
|
|
update_card_for_sweep(index * 2, mask & 0xffff);
|
|
update_card_for_sweep(index * 2 + 1, (mask >> 16) & 0xffff);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
}
|