17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "gc/g1/g1CodeBlobClosure.hpp"
  26 #include "gc/g1/g1OopClosures.hpp"
  27 #include "memory/iterator.hpp"
  28 
  29 class G1CollectedHeap;
  30 class G1ParScanThreadState;
  31 
  32 // Simple holder object for a complete set of closures used by the G1 evacuation code.
  33 template <G1Mark Mark>
  34 class G1SharedClosures {
  35   static bool needs_strong_processing() {
  36     // Request strong code root processing when G1MarkFromRoot is passed in during
  37     // initial mark.
  38     return Mark == G1MarkFromRoot;
  39   }
  40 public:
  41   G1ParCopyClosure<G1BarrierNone, Mark> _oops;
  42   G1ParCopyClosure<G1BarrierCLD,  Mark> _oops_in_cld;
  43   // We do not need (and actually should not) collect oops from nmethods into the
  44   // optional collection set as we already automatically collect the corresponding
  45   // nmethods in the region's strong code roots set. So set G1BarrierNoOptRoots in
  46   // this closure.
  47   // If these were present there would be opportunity for multiple threads to try
  48   // to change this oop* at the same time. Since embedded oops are not necessarily
  49   // word-aligned, this could lead to word tearing during update and crashes.
  50   G1ParCopyClosure<G1BarrierNoOptRoots, Mark> _oops_in_nmethod;
  51 
  52   G1CLDScanClosure                _clds;
  53   G1CodeBlobClosure               _codeblobs;
  54 
  55   G1SharedClosures(G1CollectedHeap* g1h, G1ParScanThreadState* pss, bool process_only_dirty) :
  56     _oops(g1h, pss),
  57     _oops_in_cld(g1h, pss),

  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "gc/g1/g1CodeBlobClosure.hpp"
  26 #include "gc/g1/g1OopClosures.hpp"
  27 #include "memory/iterator.hpp"
  28 
  29 class G1CollectedHeap;
  30 class G1ParScanThreadState;
  31 
  32 // Simple holder object for a complete set of closures used by the G1 evacuation code.
  33 template <G1Mark Mark>
  34 class G1SharedClosures {
  35   static bool needs_strong_processing() {
  36     // Request strong code root processing when G1MarkFromRoot is passed in during
  37     // concurrent start.
  38     return Mark == G1MarkFromRoot;
  39   }
  40 public:
  41   G1ParCopyClosure<G1BarrierNone, Mark> _oops;
  42   G1ParCopyClosure<G1BarrierCLD,  Mark> _oops_in_cld;
  43   // We do not need (and actually should not) collect oops from nmethods into the
  44   // optional collection set as we already automatically collect the corresponding
  45   // nmethods in the region's strong code roots set. So set G1BarrierNoOptRoots in
  46   // this closure.
  47   // If these were present there would be opportunity for multiple threads to try
  48   // to change this oop* at the same time. Since embedded oops are not necessarily
  49   // word-aligned, this could lead to word tearing during update and crashes.
  50   G1ParCopyClosure<G1BarrierNoOptRoots, Mark> _oops_in_nmethod;
  51 
  52   G1CLDScanClosure                _clds;
  53   G1CodeBlobClosure               _codeblobs;
  54 
  55   G1SharedClosures(G1CollectedHeap* g1h, G1ParScanThreadState* pss, bool process_only_dirty) :
  56     _oops(g1h, pss),
  57     _oops_in_cld(g1h, pss),