void CardTableRS::invalidate_or_clear(Generation* gen, bool younger,
bool perm) {
GenCollectedHeap* gch = GenCollectedHeap::heap();
// For each generation gen (and younger and/or perm)
// invalidate the cards for the currently occupied part
// of that generation and clear the cards for the
// unoccupied part of the generation (if any, making use
// of that generation's prev_used_region to determine that
// region). No need to do anything for the youngest
// generation. Also see note#20040107.ysr above.
Generation* g = gen;
for(Generation* prev_gen = gch->prev_gen(g); prev_gen != NULL;
g = prev_gen, prev_gen = gch->prev_gen(g)) {
MemRegion used_mr = g->used_region();
MemRegion to_be_cleared_mr = g->prev_used_region().minus(used_mr);
if (!to_be_cleared_mr.is_empty()) {
clear(to_be_cleared_mr);
}
invalidate(used_mr);
if (!younger) break;
}
// Clear perm gen cards if asked to do so.
if (perm) {
g = gch->perm_gen();
MemRegion used_mr = g->used_region();
MemRegion to_be_cleared_mr = g->prev_used_region().minus(used_mr);
if (!to_be_cleared_mr.is_empty()) {
clear(to_be_cleared_mr);
}
invalidate(used_mr);
}
}
