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8253081: G1 fails on stale objects in archived module graph in Open Archive regions

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Change the handling of Open Archive areas, instead of assuming that everything in there is live always, a root containing references to all live root objects is provided. Adapt G1 to handle Open Archive regions as any other old region apart from never compacting or evacuating them.

Co-authored-by: Ioi Lam <iklam@openjdk.org>
Reviewed-by: kbarrett, sjohanss, redestad
This commit is contained in:
Thomas Schatzl 2020-11-18 08:21:03 +00:00
parent c08921487b
commit d30956055b
32 changed files with 584 additions and 230 deletions
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17
src/hotspot/share/classfile/classLoaderDataShared.cpp
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@ -59,6 +59,7 @@ public:
}
void restore(ClassLoaderData* loader_data, bool do_entries, bool do_oops);
void clear_archived_oops();
};
static ArchivedClassLoaderData _archived_boot_loader_data;
@ -123,6 +124,15 @@ void ArchivedClassLoaderData::restore(ClassLoaderData* loader_data, bool do_entr
}
}
void ArchivedClassLoaderData::clear_archived_oops() {
assert(UseSharedSpaces, "must be");
if (_modules != NULL) {
for (int i = 0; i < _modules->length(); i++) {
_modules->at(i)->clear_archived_oops();
}
}
}
// ------------------------------
static ClassLoaderData* null_class_loader_data() {
@ -183,6 +193,13 @@ void ClassLoaderDataShared::serialize(SerializeClosure* f) {
}
}
void ClassLoaderDataShared::clear_archived_oops() {
assert(UseSharedSpaces && !MetaspaceShared::use_full_module_graph(), "must be");
_archived_boot_loader_data.clear_archived_oops();
_archived_platform_loader_data.clear_archived_oops();
_archived_system_loader_data.clear_archived_oops();
}
oop ClassLoaderDataShared::restore_archived_oops_for_null_class_loader_data() {
assert(UseSharedSpaces && MetaspaceShared::use_full_module_graph(), "must be");
_archived_boot_loader_data.restore(null_class_loader_data(), false, true);