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8131734: assert(!is_null(v)) failed: narrow klass value can never be zero with -Xshared:auto

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Handle shared string mapping failures.

Co-authored-by: Tom Benson <tom.benson@oracle.com>
Reviewed-by: tschatzl, kbarrett, ddmitriev, hseigel
This commit is contained in:
Jiangli Zhou 2015-08-25 17:22:56 -04:00
parent 24ddd9ba7c
commit 9ee2b211f9
10 changed files with 190 additions and 22 deletions
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13
hotspot/src/share/vm/gc/g1/heapRegionManager.cpp
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@ -426,7 +426,7 @@ uint HeapRegionManager::shrink_by(uint num_regions_to_remove) {
(num_last_found = find_empty_from_idx_reverse(cur, &idx_last_found)) > 0) {
uint to_remove = MIN2(num_regions_to_remove - removed, num_last_found);
uncommit_regions(idx_last_found + num_last_found - to_remove, to_remove);
shrink_at(idx_last_found + num_last_found - to_remove, to_remove);
cur = idx_last_found;
removed += to_remove;
@ -437,6 +437,17 @@ uint HeapRegionManager::shrink_by(uint num_regions_to_remove) {
return removed;
}
void HeapRegionManager::shrink_at(uint index, size_t num_regions) {
#ifdef ASSERT
for (uint i = index; i < (index + num_regions); i++) {
assert(is_available(i), err_msg("Expected available region at index %u", i));
assert(at(i)->is_empty(), err_msg("Expected empty region at index %u", i));
assert(at(i)->is_free(), err_msg("Expected free region at index %u", i));
}
#endif
uncommit_regions(index, num_regions);
}
uint HeapRegionManager::find_empty_from_idx_reverse(uint start_idx, uint* res_idx) const {
guarantee(start_idx < _allocated_heapregions_length, "checking");
guarantee(res_idx != NULL, "checking");