Hi!
Xiao-Feng,
During my investigations I tried to copy some particular object from
MOS to some space allocated by myself. And I've got a problem during
this process.
I've got 2 methods called right before move_compact compaction starts
(line #220, mspace_move_compact.cpp) .
a) The first one is void gc_layout_alloc_mem() [1] is calculating the
size_in_bytes of the space which should be allocated for the sequence
of objects which are stored in list<seqSimpleList>[2] (variable
seq_head) - seqSimpleList just holds the the head and the tail of the
sequence. After calcualting the size_in_bytes variable
layout_mem_space points to the allocated space.
b) The second one is void gc_layout_copy_seq_to_mem()[3] just copies
object of the sequences stored in list<seqSimpleList> variable
seq_head to the previously allocated space (layout_mem_space). During
this phase obj_unmark_in_vt() and obj_set_fw_in_oi () called for each
iterated object.
But I've got an assertion during move_compact phase :
assert(vt && vt->gcvt) in vtable_get_gcvt_raw
Call Stack:
vtable_get_gcvt_raw(Partial_Reveal_VTable * vt=0x00000000)
obj_get_gcvt_raw(Partial_Reveal_Object * obj=0x109f6898)
object_is_array(Partial_Reveal_Object * obj=0x109f6898)
vm_object_size(Partial_Reveal_Object * obj=0x109f6898)
obj_end(Partial_Reveal_Object * obj=0x109f6898)
block_get_next_marked_object(Block_Header * block=0x109f0000, void *
* start_pos=0x0211fd54)
mspace_move_objects(Collector * collector=0x004ada70, Mspace *
mspace=0x00493100)
I've got no idea why this happens. I'll appreciate any help. I am
looking forward for your suggestions.
[1]
void gc_layout_alloc_mem()
{
unsigned long size_in_bytes = 0;
unsigned obj_size = 0, hash_extend_size = 0;
Partial_Reveal_Object* p_obj = NULL;
fhSimpleList* field_it = NULL;
for (list<seqSimpleList>::iterator it = seq_head.begin(); it !=
seq_head.end(); it++)
{
for (p_obj = (*it).s_head;
p_obj != (*it).s_tail;
field_it = gc_layout_obj_get_hot_field_it(p_obj),
p_obj = gc_layout_get_obj_by_hot_field(p_obj, field_it))
{
#ifdef USE_32BITS_HASHCODE
hash_extend_size =
(hashcode_is_attached((Partial_Reveal_Object*)p_obj))?GC_OBJECT_ALIGNMENT:0;
#endif
obj_size = vm_object_size(p_obj) + hash_extend_size;
size_in_bytes += obj_size;
}
}
layout_mem_space = (char*) malloc(sizeof(char)*size_in_bytes);
}
[2]
#define seqSimpleList seq_simple_list
struct seq_simple_list
{
Partial_Reveal_Object* s_head;
Partial_Reveal_Object* s_tail;
};
[3]
void gc_layout_copy_seq_to_mem()
{
Partial_Reveal_Object *p_obj = NULL;
char* _currMem = layout_mem_space;
unsigned obj_size = 0, hash_extend_size = 0;
fhSimpleList* field_it = NULL;
for (list<seqSimpleList>::iterator it = seq_head.begin(); it !=
seq_head.end(); it++)
{
// copy sequence
for (p_obj = (*it).s_head;
p_obj != (*it).s_tail;
field_it = gc_layout_obj_get_hot_field_it(p_obj),
p_obj = gc_layout_get_obj_by_hot_field(p_obj, field_it))
{
#ifdef USE_32BITS_HASHCODE
hash_extend_size =
(hashcode_is_attached((Partial_Reveal_Object*)p_obj))?GC_OBJECT_ALIGNMENT:0;
#endif
obj_size = vm_object_size(p_obj) + hash_extend_size;
obj_set_fw_in_oi(p_obj, _currMem); // fix pointers
memcpy(_currMem, p_obj, obj_size);
obj_unmark_in_vt(p_obj);
_currMem += obj_size;
}
}
}
--
Yuri S. Kashnikov
Novosibirsk State University, Russia
2 Pirogova street
630090, Novosibirsk-90
[EMAIL PROTECTED]
