void ReceiverTypeData::oop_iterate_m(OopClosure* blk, MemRegion mr) {
// Currently, this interface is called only during card-scanning for
// a young gen gc, in which case this object cannot contribute anything,
// since it does not contain any references that cross out of
// the perm gen. However, for future more general use we allow
// the possibility of calling for instance from more general
// iterators (for example, a future regionalized perm gen for G1,
// or the possibility of moving some references out of perm in
// the case of other collectors). In that case, you will need
// to relax or remove some of the assertions below.
#ifdef ASSERT
// Verify that none of the embedded oop references cross out of
// this generation.
for (uint row = 0; row < row_limit(); row++) {
if (receiver(row) != NULL) {
oop* adr = adr_receiver(row);
CollectedHeap* h = Universe::heap();
assert(h->is_permanent(adr) && h->is_permanent_or_null(*adr), "Not intra-perm");
}
}
#endif // ASSERT
assert(!blk->should_remember_mdo(), "Not expected to remember MDO");
return; // Nothing to do, see comment above
#if 0
if (blk->should_remember_mdo()) {
// This is a set of weak references that need
// to be followed at the end of the strong marking
// phase. Memoize this object so it can be visited
// in the weak roots processing phase.
blk->remember_mdo(data());
} else { // normal scan
for (uint row = 0; row < row_limit(); row++) {
if (receiver(row) != NULL) {
oop* adr = adr_receiver(row);
if (mr.contains(adr)) {
blk->do_oop(adr);
} else if ((HeapWord*)adr >= mr.end()) {
// Test that the current cursor and the two ends of the range
// that we may have skipped iterating over are monotonically ordered;
// this is just a paranoid assertion, just in case represetations
// should change in the future rendering the short-circuit return
// here invalid.
assert((row+1 >= row_limit() || adr_receiver(row+1) > adr) &&
(row+2 >= row_limit() || adr_receiver(row_limit()-1) > adr_receiver(row+1)), "Reducing?");
break; // remaining should be outside this mr too
}
}
}
}
#endif
}
void ReceiverTypeData::print_receiver_data_on(outputStream* st) {
uint row;
int entries = 0;
for (row = 0; row < row_limit(); row++) {
if (receiver(row) != NULL) entries++;
}
st->print_cr("count(%u) entries(%u)", count(), entries);
for (row = 0; row < row_limit(); row++) {
if (receiver(row) != NULL) {
tab(st);
receiver(row)->print_value_on(st);
st->print_cr("(%u)", receiver_count(row));
}
}
}
void VirtualCallData::follow_contents() {
for (uint row = 0; row < row_limit(); row++) {
if (receiver(row) != NULL) {
MarkSweep::mark_and_push(adr_receiver(row));
}
}
}
void ReceiverTypeData::adjust_pointers() {
for (uint row = 0; row < row_limit(); row++) {
if (receiver(row) != NULL) {
MarkSweep::adjust_pointer(adr_receiver(row));
}
}
}
void ReceiverTypeData::update_pointers() {
for (uint row = 0; row < row_limit(); row++) {
if (receiver_unchecked(row) != NULL) {
PSParallelCompact::adjust_pointer(adr_receiver(row));
}
}
}
void VirtualCallData::print_data_on(outputStream* st) {
print_shared(st, "VirtualCallData");
uint row;
int entries = 0;
for (row = 0; row < row_limit(); row++) {
if (receiver(row) != NULL) entries++;
}
st->print_cr("count(%u) entries(%u)", count(), entries);
for (row = 0; row < row_limit(); row++) {
if (receiver(row) != NULL) {
tab(st);
receiver(row)->print_value_on(st);
st->print_cr("(%u)", receiver_count(row));
}
}
}
void VirtualCallData::oop_iterate(OopClosure* blk) {
for (uint row = 0; row < row_limit(); row++) {
if (receiver(row) != NULL) {
blk->do_oop(adr_receiver(row));
}
}
}
void RetData::print_data_on(outputStream* st) {
print_shared(st, "RetData");
uint row;
int entries = 0;
for (row = 0; row < row_limit(); row++) {
if (bci(row) != no_bci) entries++;
}
st->print_cr("count(%u) entries(%u)", count(), entries);
for (row = 0; row < row_limit(); row++) {
if (bci(row) != no_bci) {
tab(st);
st->print_cr("bci(%d: count(%u) displacement(%d))",
bci(row), bci_count(row), bci_displacement(row));
}
}
}
void ReceiverTypeData::follow_weak_refs(BoolObjectClosure* is_alive_cl) {
for (uint row = 0; row < row_limit(); row++) {
klassOop p = receiver(row);
if (p != NULL && !is_alive_cl->do_object_b(p)) {
clear_row(row);
}
}
}
void ReceiverTypeData::clean_weak_klass_links(BoolObjectClosure* is_alive_cl) {
for (uint row = 0; row < row_limit(); row++) {
Klass* p = receiver(row);
if (p != NULL && !p->is_loader_alive(is_alive_cl)) {
clear_row(row);
}
}
}
void ciReceiverTypeData::translate_receiver_data_from(ProfileData* data) {
for (uint row = 0; row < row_limit(); row++) {
klassOop k = data->as_ReceiverTypeData()->receiver(row);
if (k != NULL) {
ciKlass* klass = CURRENT_ENV->get_object(k)->as_klass();
set_receiver(row, klass);
}
}
}
void ciVirtualCallData::translate_from(ProfileData* data) {
for (uint row = 0; row < row_limit(); row++) {
klassOop k = data->as_VirtualCallData()->receiver(row);
if (k) {
ciKlass* klass = CURRENT_ENV->get_object(k)->as_klass();
set_receiver(row, klass);
}
}
};
void RetData::post_initialize(BytecodeStream* stream, methodDataOop mdo) {
for (uint row = 0; row < row_limit(); row++) {
set_bci_displacement(row, -1);
set_bci(row, no_bci);
}
// release so other threads see a consistent state. bci is used as
// a valid flag for bci_displacement.
OrderAccess::release();
}
void VirtualCallData::oop_iterate_m(OopClosure* blk, MemRegion mr) {
for (uint row = 0; row < row_limit(); row++) {
if (receiver(row) != NULL) {
oop* adr = adr_receiver(row);
if (mr.contains(adr)) {
blk->do_oop(adr);
}
}
}
}
void ReceiverTypeData::update_pointers(HeapWord* beg_addr, HeapWord* end_addr) {
// The loop bounds could be computed based on beg_addr/end_addr and the
// boundary test hoisted outside the loop (see klassVTable for an example);
// however, row_limit() is small enough (2) to make that less efficient.
for (uint row = 0; row < row_limit(); row++) {
if (receiver_unchecked(row) != NULL) {
PSParallelCompact::adjust_pointer(adr_receiver(row), beg_addr, end_addr);
}
}
}
void ciReceiverTypeData::translate_receiver_data_from(const ProfileData* data) {
for (uint row = 0; row < row_limit(); row++) {
Klass* k = data->as_ReceiverTypeData()->receiver(row);
if (k != NULL) {
ciKlass* klass = CURRENT_ENV->get_klass(k);
CURRENT_ENV->ensure_metadata_alive(klass);
set_receiver(row, klass);
}
}
}
void ReceiverTypeData::oop_iterate(OopClosure* blk) {
if (blk->should_remember_mdo()) {
// This is a set of weak references that need
// to be followed at the end of the strong marking
// phase. Memoize this object so it can be visited
// in the weak roots processing phase.
blk->remember_mdo(data());
} else { // normal scan
for (uint row = 0; row < row_limit(); row++) {
if (receiver(row) != NULL) {
oop* adr = adr_receiver(row);
blk->do_oop(adr);
}
}
}
}
// This routine needs to atomically update the RetData structure, so the
// caller needs to hold the RetData_lock before it gets here. Since taking
// the lock can block (and allow GC) and since RetData is a ProfileData is a
// wrapper around a derived oop, taking the lock in _this_ method will
// basically cause the 'this' pointer's _data field to contain junk after the
// lock. We require the caller to take the lock before making the ProfileData
// structure. Currently the only caller is InterpreterRuntime::update_mdp_for_ret
address RetData::fixup_ret(int return_bci, methodDataHandle h_mdo) {
// First find the mdp which corresponds to the return bci.
address mdp = h_mdo->bci_to_dp(return_bci);
// Now check to see if any of the cache slots are open.
for (uint row = 0; row < row_limit(); row++) {
if (bci(row) == no_bci) {
set_bci_displacement(row, mdp - dp());
set_bci_count(row, DataLayout::counter_increment);
// Barrier to ensure displacement is written before the bci; allows
// the interpreter to read displacement without fear of race condition.
release_set_bci(row, return_bci);
break;
}
}
return mdp;
}
void set_receiver(uint row, ciKlass* recv) {
assert((uint)row < row_limit(), "oob");
set_intptr_at(receiver0_offset + row * receiver_type_row_cell_count,
(intptr_t) recv);
}
ciKlass* receiver(uint row) {
assert((uint)row < row_limit(), "oob");
ciObject* recv = (ciObject*)intptr_at(receiver0_offset + row * receiver_type_row_cell_count);
assert(recv == NULL || recv->is_klass(), "wrong type");
return (ciKlass*)recv;
}