int rSet::get_size(memOop obj) {
unsigned char* p = (unsigned char*) byte_for(obj->addr());
unsigned char h = *p++;
if (h <= lim_0 + 1) return h + lim_0;
if (h == lim_0 + 2) return (*(unsigned char*) p) + lim_1;
if (h == lim_0 + 3) return (*(unsigned short*) p) + lim_2;
if (h == lim_0 + 4) return (*(unsigned int*) p) + lim_3;
ShouldNotReachHere();
return 0;
}
bool rSet::is_object_dirty(memOop obj) {
assert(!obj->is_new(), "just checking");
char* current_byte = byte_for(obj->addr());
char* end_byte = byte_for(obj->addr() + obj->size());
while (current_byte <= end_byte) {
if (*current_byte == 0) return true;
current_byte++;
}
return false;
}
void rSet::set_size(memOop obj, int size) {
unsigned char* p = (unsigned char*) byte_for(obj->addr());
assert(size >= lim_0, "size must be >= max_age");
if (size < lim_1) { // use 1 byte
*p = (unsigned char) (size - lim_0);
} else if (size < lim_2) { // use 1 + 1 bytes
*p++ = lim_0 + 2;
*p = (unsigned char) (size - lim_1);
} else if (size < lim_3) { // use 1 + 2 bytes
*p++ = lim_0 + 3;
*(unsigned short*)p = (unsigned short) (size - lim_2);
} else { // use 1 + 4 bytes
*p++ = lim_0 + 4;
*(unsigned int*)p = (unsigned int) (size - lim_3);
}
}
void rSet::print_set_for_object(memOop obj) {
std->print("Remember set for 0x%lx ", obj);
obj->print_value();
std->cr();
if (obj->is_new()) {
std->print_cr(" object is in new space!");
} else {
std->sp();
char* current_byte = byte_for(obj->addr());
char* end_byte = byte_for(obj->addr() + obj->size());
while (current_byte <= end_byte) {
if (*current_byte) {
std->print("_");
} else {
std->print("*");
}
current_byte++;
}
std->cr();
}
}