Visit class native roots from VisitReferences

Visit class roots when we call Class::VisitReferences instead of in
the class linker. This makes it easier to implement class unloading
since unmarked classes won't have their roots visited by the class
linker.

Bug: 22181835
Change-Id: I63f31e5ebef7b2a0b764b3ba3cb038b3f561b379

1 files changed, 7 insertions, 2 deletions

diff --git a/compiler/driver/compiler_driver.cc b/compiler/driver/compiler_driver.cc
index 05705a2d31..a35f306612 100644
--- a/compiler/driver/compiler_driver.cc
+++ b/compiler/driver/compiler_driver.cc
@@ -883,8 +883,13 @@ class ClinitImageUpdate {
   }
 
   // java.lang.Reference visitor for VisitReferences.
-  void operator()(mirror::Class* /* klass */, mirror::Reference* /* ref */) const {
-  }
+  void operator()(mirror::Class* klass ATTRIBUTE_UNUSED, mirror::Reference* ref ATTRIBUTE_UNUSED)
+      const {}
+
+  // Ignore class native roots.
+  void VisitRootIfNonNull(mirror::CompressedReference<mirror::Object>* root ATTRIBUTE_UNUSED)
+      const {}
+  void VisitRoot(mirror::CompressedReference<mirror::Object>* root ATTRIBUTE_UNUSED) const {}
 
   void Walk() SHARED_REQUIRES(Locks::mutator_lock_) {
     // Use the initial classes as roots for a search.