jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/shared/markSweep.hpp@097d78aaf2b5 (annotated)

src/share/vm/gc_implementation/shared/markSweep.hpp@097d78aaf2b5 (annotated)

src/share/vm/gc_implementation/shared/markSweep.hpp

Thu, 04 Oct 2012 10:40:23 -0700

author: jmasa
date: Thu, 04 Oct 2012 10:40:23 -0700
changeset 4131: 097d78aaf2b5
parent 4037: da91efe96a93
child 4384: b735136e0d82
permissions: -rw-r--r--

7198873: NPG: VM Does not unload classes with UseConcMarkSweepGC
Reviewed-by: johnc, mgerdin, jwilhelm

 /*
  * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_MARKSWEEP_HPP
 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_MARKSWEEP_HPP
 #include "gc_interface/collectedHeap.hpp"
 #include "memory/universe.hpp"
 #include "oops/markOop.hpp"
 #include "oops/oop.hpp"
 #include "runtime/timer.hpp"
 #include "utilities/growableArray.hpp"
 #include "utilities/stack.hpp"
 #include "utilities/taskqueue.hpp"
 class ReferenceProcessor;
 class DataLayout;
 // MarkSweep takes care of global mark-compact garbage collection for a
 // GenCollectedHeap using a four-phase pointer forwarding algorithm.  All
 // generations are assumed to support marking; those that can also support
 // compaction.
 //
 // Class unloading will only occur when a full gc is invoked.
 // If VALIDATE_MARK_SWEEP is defined, the -XX:+ValidateMarkSweep flag will
 // be operational, and will provide slow but comprehensive self-checks within
 // the GC.  This is not enabled by default in product or release builds,
 // since the extra call to track_adjusted_pointer() in _adjust_pointer()
 // would be too much overhead, and would disturb performance measurement.
 // However, debug builds are sometimes way too slow to run GC tests!
 #ifdef ASSERT
 #define VALIDATE_MARK_SWEEP 1
 #endif
 #ifdef VALIDATE_MARK_SWEEP
 #define VALIDATE_MARK_SWEEP_ONLY(code) code
 #else
 #define VALIDATE_MARK_SWEEP_ONLY(code)
 #endif
 // declared at end
 class PreservedMark;
 class MarkSweep : AllStatic {
   //
   // Inline closure decls
   //
   class FollowRootClosure: public OopsInGenClosure {
    public:
     virtual void do_oop(oop* p);
     virtual void do_oop(narrowOop* p);
   };
   class MarkAndPushClosure: public OopClosure {
    public:
     virtual void do_oop(oop* p);
     virtual void do_oop(narrowOop* p);
   };
   // The one and only place to start following the classes.
   // Should only be applied to the ClassLoaderData klasses list.
   class FollowKlassClosure : public KlassClosure {
    public:
     void do_klass(Klass* klass);
   };
   class AdjustKlassClosure : public KlassClosure {
    public:
     void do_klass(Klass* klass);
   };
   class FollowStackClosure: public VoidClosure {
    public:
     virtual void do_void();
   };
   class AdjustPointerClosure: public OopsInGenClosure {
    private:
     bool _is_root;
    public:
     AdjustPointerClosure(bool is_root) : _is_root(is_root) {}
     virtual void do_oop(oop* p);
     virtual void do_oop(narrowOop* p);
   };
   // Used for java/lang/ref handling
   class IsAliveClosure: public BoolObjectClosure {
    public:
     virtual void do_object(oop p);
     virtual bool do_object_b(oop p);
   };
   class KeepAliveClosure: public OopClosure {
    protected:
     template <class T> void do_oop_work(T* p);
    public:
     virtual void do_oop(oop* p);
     virtual void do_oop(narrowOop* p);
   };
   //
   // Friend decls
   //
   friend class AdjustPointerClosure;
   friend class KeepAliveClosure;
   friend class VM_MarkSweep;
   friend void marksweep_init();
   //
   // Vars
   //
  protected:
   // Total invocations of a MarkSweep collection
   static unsigned int _total_invocations;
   // Traversal stacks used during phase1
   static Stack<oop, mtGC>                      _marking_stack;
   static Stack<ObjArrayTask, mtGC>             _objarray_stack;
   // Space for storing/restoring mark word
   static Stack<markOop, mtGC>                  _preserved_mark_stack;
   static Stack<oop, mtGC>                      _preserved_oop_stack;
   static size_t                          _preserved_count;
   static size_t                          _preserved_count_max;
   static PreservedMark*                  _preserved_marks;
   // Reference processing (used in ...follow_contents)
   static ReferenceProcessor*             _ref_processor;
 #ifdef VALIDATE_MARK_SWEEP
   static GrowableArray<void*>*           _root_refs_stack;
   static GrowableArray<oop> *            _live_oops;
   static GrowableArray<oop> *            _live_oops_moved_to;
   static GrowableArray<size_t>*          _live_oops_size;
   static size_t                          _live_oops_index;
   static size_t                          _live_oops_index_at_perm;
   static GrowableArray<void*>*           _other_refs_stack;
   static GrowableArray<void*>*           _adjusted_pointers;
   static bool                            _pointer_tracking;
   static bool                            _root_tracking;
   // The following arrays are saved since the time of the last GC and
   // assist in tracking down problems where someone has done an errant
   // store into the heap, usually to an oop that wasn't properly
   // handleized across a GC. If we crash or otherwise fail before the
   // next GC, we can query these arrays to find out the object we had
   // intended to do the store to (assuming it is still alive) and the
   // offset within that object. Covered under RecordMarkSweepCompaction.
   static GrowableArray<HeapWord*> *      _cur_gc_live_oops;
   static GrowableArray<HeapWord*> *      _cur_gc_live_oops_moved_to;
   static GrowableArray<size_t>*          _cur_gc_live_oops_size;
   static GrowableArray<HeapWord*> *      _last_gc_live_oops;
   static GrowableArray<HeapWord*> *      _last_gc_live_oops_moved_to;
   static GrowableArray<size_t>*          _last_gc_live_oops_size;
 #endif
   // Non public closures
   static KeepAliveClosure keep_alive;
   // Debugging
   static void trace(const char* msg) PRODUCT_RETURN;
  public:
   // Public closures
   static IsAliveClosure       is_alive;
   static FollowRootClosure    follow_root_closure;
   static CodeBlobToOopClosure follow_code_root_closure; // => follow_root_closure
   static MarkAndPushClosure   mark_and_push_closure;
   static FollowKlassClosure   follow_klass_closure;
   static FollowStackClosure   follow_stack_closure;
   static AdjustPointerClosure adjust_root_pointer_closure;
   static AdjustPointerClosure adjust_pointer_closure;
   static AdjustKlassClosure   adjust_klass_closure;
   // Accessors
   static unsigned int total_invocations() { return _total_invocations; }
   // Reference Processing
   static ReferenceProcessor* const ref_processor() { return _ref_processor; }
   // Call backs for marking
   static void mark_object(oop obj);
   // Mark pointer and follow contents.  Empty marking stack afterwards.
   template <class T> static inline void follow_root(T* p);
   // Check mark and maybe push on marking stack
   template <class T> static void mark_and_push(T* p);
   static inline void push_objarray(oop obj, size_t index);
   static void follow_stack();   // Empty marking stack.
   static void follow_klass(Klass* klass);
   static void adjust_klass(Klass* klass);
   static void follow_class_loader(ClassLoaderData* cld);
   static void adjust_class_loader(ClassLoaderData* cld);
   static void preserve_mark(oop p, markOop mark);
                                 // Save the mark word so it can be restored later
   static void adjust_marks();   // Adjust the pointers in the preserved marks table
   static void restore_marks();  // Restore the marks that we saved in preserve_mark
   template <class T> static inline void adjust_pointer(T* p, bool isroot);
   static void adjust_root_pointer(oop* p)  { adjust_pointer(p, true); }
   static void adjust_pointer(oop* p)       { adjust_pointer(p, false); }
   static void adjust_pointer(narrowOop* p) { adjust_pointer(p, false); }
 #ifdef VALIDATE_MARK_SWEEP
   static void track_adjusted_pointer(void* p, bool isroot);
   static void check_adjust_pointer(void* p);
   static void track_interior_pointers(oop obj);
   static void check_interior_pointers();
   static void reset_live_oop_tracking();
   static void register_live_oop(oop p, size_t size);
   static void validate_live_oop(oop p, size_t size);
   static void live_oop_moved_to(HeapWord* q, size_t size, HeapWord* compaction_top);
   static void compaction_complete();
   // Querying operation of RecordMarkSweepCompaction results.
   // Finds and prints the current base oop and offset for a word
   // within an oop that was live during the last GC. Helpful for
   // tracking down heap stomps.
   static void print_new_location_of_heap_address(HeapWord* q);
 #endif
 };
 class PreservedMark VALUE_OBJ_CLASS_SPEC {
 private:
   oop _obj;
   markOop _mark;
 public:
   void init(oop obj, markOop mark) {
     _obj = obj;
     _mark = mark;
   }
   void adjust_pointer() {
     MarkSweep::adjust_pointer(&_obj);
   }
   void restore() {
     _obj->set_mark(_mark);
   }
 };
 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_MARKSWEEP_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/shared/markSweep.hpp@097d78aaf2b5 (annotated)

src/share/vm/gc_implementation/shared/markSweep.hpp