Make class loaders weak roots

Making the class loaders weak roots in the class linker prevents them
from keeping the classes as live. However we currently do mark them
as strong roots to make sure no accidental class unloading occurs
until the logic to free from linear alloc is complete.

Bug: 22720414

Change-Id: I57466236d9ce6fd064dda9a30ce8ab68094fb8b0

1 files changed, 1 insertions, 0 deletions

diff --git a/runtime/java_vm_ext.cc b/runtime/java_vm_ext.cc
index d6c798a863..92eef3983b 100644
--- a/runtime/java_vm_ext.cc
+++ b/runtime/java_vm_ext.cc
@@ -592,6 +592,7 @@ mirror::Object* JavaVMExt::DecodeWeakGlobal(Thread* self, IndirectRef ref) {
   // This only applies in the case where MayAccessWeakGlobals goes from false to true. In the other
   // case, it may be racy, this is benign since DecodeWeakGlobalLocked does the correct behavior
   // if MayAccessWeakGlobals is false.
+  DCHECK_EQ(GetIndirectRefKind(ref), kWeakGlobal);
   if (LIKELY(MayAccessWeakGlobalsUnlocked(self))) {
     return weak_globals_.SynchronizedGet(ref);
   }