src/share/vm/ci/ciObjectFactory.cpp

*** 44,53 ****
--- 44,56 ----
  #include "gc_interface/collectedHeap.inline.hpp"
  #include "memory/allocation.inline.hpp"
  #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
  //
  // This class handles requests for the creation of new instances
  // of ciObject and its subclasses.  It contains a caching mechanism
*** 372,381 ****
--- 375,415 ----
    // The oop is of some type not supported by the compiler interface.
    ShouldNotReachHere();
    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
  //
  // Get the ciMethod representing an unloaded/unfound method.
  //