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src/hotspot/share/gc/shared/gcBehaviours.cpp

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   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  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 "precompiled.hpp"
  26 #include "code/compiledMethod.hpp"
  27 #include "code/nmethod.hpp"
  28 #include "gc/shared/gcBehaviours.hpp"
  29 
  30 IsUnloadingBehaviour* IsUnloadingBehaviour::_current = NULL;
  31 
  32 class IsCompiledMethodUnloadingOopClosure: public OopClosure {
  33   BoolObjectClosure *_cl;
  34   bool _is_unloading;
  35 
  36 public:
  37   IsCompiledMethodUnloadingOopClosure(BoolObjectClosure* cl)
  38     : _cl(cl),
  39       _is_unloading(false)
  40   { }
  41 
  42   virtual void do_oop(oop* p) {
  43     if (_is_unloading) {
  44       return;
  45     }
  46     oop obj = *p;
  47     if (obj == NULL) {
  48       return;
  49     }
  50     if (!_cl->do_object_b(obj)) {
  51       _is_unloading = true;
  52     }
  53   }
  54 
  55   virtual void do_oop(narrowOop* p) {
  56     ShouldNotReachHere();
  57   }
  58 
  59   bool is_unloading() const {
  60     return _is_unloading;
  61   }
  62 };
  63 
  64 bool ClosureIsUnloadingBehaviour::is_unloading(CompiledMethod* cm) const {
  65   if (cm->is_nmethod()) {




  66     IsCompiledMethodUnloadingOopClosure cl(_cl);
  67     static_cast<nmethod*>(cm)->oops_do(&cl, true /* allow_dead */);
  68     return cl.is_unloading();
  69   } else {
  70     return false;
  71   }
  72 }


   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  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 "precompiled.hpp"
  26 #include "code/compiledMethod.inline.hpp"
  27 #include "code/nmethod.hpp"
  28 #include "gc/shared/gcBehaviours.hpp"
  29 
  30 IsUnloadingBehaviour* IsUnloadingBehaviour::_current = NULL;
  31 
  32 class IsCompiledMethodUnloadingOopClosure: public OopClosure {
  33   BoolObjectClosure *_cl;
  34   bool _is_unloading;
  35 
  36 public:
  37   IsCompiledMethodUnloadingOopClosure(BoolObjectClosure* cl)
  38     : _cl(cl),
  39       _is_unloading(false)
  40   { }
  41 
  42   virtual void do_oop(oop* p) {
  43     if (_is_unloading) {
  44       return;
  45     }
  46     oop obj = *p;
  47     if (obj == NULL) {
  48       return;
  49     }
  50     if (!_cl->do_object_b(obj)) {
  51       _is_unloading = true;
  52     }
  53   }
  54 
  55   virtual void do_oop(narrowOop* p) {
  56     ShouldNotReachHere();
  57   }
  58 
  59   bool is_unloading() const {
  60     return _is_unloading;
  61   }
  62 };
  63 
  64 bool ClosureIsUnloadingBehaviour::is_unloading(CompiledMethod* cm) const {
  65   if (cm->is_nmethod()) {
  66     if (cm->as_nmethod()->is_on_continuation_stack()) {
  67       return false; // TODO eosterlund: Maybe the right fix is to return true, but instead of making it make_unloaded() make it make_not_entrant() instead. Or something like that.
  68     }
  69 
  70     IsCompiledMethodUnloadingOopClosure cl(_cl);
  71     static_cast<nmethod*>(cm)->oops_do(&cl, true /* allow_dead */);
  72     return cl.is_unloading();
  73   } else {
  74     return false;
  75   }
  76 }
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