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8212989: Allow CompiledMethod ExceptionCache have unloaded klasses

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Reviewed-by: kvn, pliden
This commit is contained in:
Erik Österlund 2018-11-05 08:01:39 +01:00
parent fdb010502b
commit f2fe71b186
6 changed files with 118 additions and 23 deletions
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29
src/hotspot/share/code/codeCache.cpp
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@ -145,6 +145,7 @@ address CodeCache::_low_bound = 0;
address CodeCache::_high_bound = 0;
int CodeCache::_number_of_nmethods_with_dependencies = 0;
nmethod* CodeCache::_scavenge_root_nmethods = NULL;
ExceptionCache* volatile CodeCache::_exception_cache_purge_list = NULL;
// Initialize arrays of CodeHeap subsets
GrowableArray<CodeHeap*>* CodeCache::_heaps = new(ResourceObj::C_HEAP, mtCode) GrowableArray<CodeHeap*> (CodeBlobType::All, true);
@ -895,6 +896,34 @@ void CodeCache::verify_icholder_relocations() {
#endif
}
// Defer freeing of concurrently cleaned ExceptionCache entries until
// after a global handshake operation.
void CodeCache::release_exception_cache(ExceptionCache* entry) {
if (SafepointSynchronize::is_at_safepoint()) {
delete entry;
} else {
for (;;) {
ExceptionCache* purge_list_head = Atomic::load(&_exception_cache_purge_list);
entry->set_purge_list_next(purge_list_head);
if (Atomic::cmpxchg(entry, &_exception_cache_purge_list, purge_list_head) == purge_list_head) {
break;
}
}
}
}
// Delete exception caches that have been concurrently unlinked,
// followed by a global handshake operation.
void CodeCache::purge_exception_caches() {
ExceptionCache* curr = _exception_cache_purge_list;
while (curr != NULL) {
ExceptionCache* next = curr->purge_list_next();
delete curr;
curr = next;
}
_exception_cache_purge_list = NULL;
}
void CodeCache::gc_prologue() { }
void CodeCache::gc_epilogue() {