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8049421: G1 Class Unloading after completing a concurrent mark cycle

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Co-authored-by: Mikael Gerdin <mikael.gerdin@oracle.com>
Reviewed-by: tschatzl, ehelin, brutisso, coleenp, roland, iveresov
This commit is contained in:
Stefan Karlsson 2014-07-07 10:12:40 +02:00
parent ef1e9b3c80
commit 1b001a2afd
75 changed files with 2169 additions and 874 deletions
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34
hotspot/src/share/vm/ci/ciObjectFactory.cpp
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@ -46,6 +46,9 @@
#include "oops/oop.inline.hpp"
#include "oops/oop.inline2.hpp"
#include "runtime/fieldType.hpp"
#if INCLUDE_ALL_GCS
# include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
#endif
// ciObjectFactory
//
@ -374,6 +377,37 @@ ciMetadata* ciObjectFactory::create_new_object(Metadata* o) {
return NULL;
}
// ------------------------------------------------------------------
// ciObjectFactory::ensure_metadata_alive
//
// Ensure that the metadata wrapped by the ciMetadata is kept alive by GC.
// This is primarily useful for metadata which is considered as weak roots
// by the GC but need to be strong roots if reachable from a current compilation.
//
void ciObjectFactory::ensure_metadata_alive(ciMetadata* m) {
ASSERT_IN_VM; // We're handling raw oops here.
#if INCLUDE_ALL_GCS
if (!UseG1GC) {
return;
}
Klass* metadata_owner_klass;
if (m->is_klass()) {
metadata_owner_klass = m->as_klass()->get_Klass();
} else if (m->is_method()) {
metadata_owner_klass = m->as_method()->get_Method()->constants()->pool_holder();
} else {
fatal("Not implemented for other types of metadata");
}
oop metadata_holder = metadata_owner_klass->klass_holder();
if (metadata_holder != NULL) {
G1SATBCardTableModRefBS::enqueue(metadata_holder);
}
#endif
}
//------------------------------------------------------------------
// ciObjectFactory::get_unloaded_method
//