jdk8-mips64-public/hotspot: src/share/vm/oops/objArrayKlassKlass.hpp@e1162778c1c8

7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
Summary: A referent object that is only weakly reachable at the start of concurrent marking but is re-attached to the strongly reachable object graph during marking may not be marked as live. This can cause the reference object to be processed prematurely and leave dangling pointers to the referent object. Implement a read barrier for the java.lang.ref.Reference::referent field by intrinsifying the Reference.get() method, and intercepting accesses though JNI, reflection, and Unsafe, so that when a non-null referent object is read it is also logged in an SATB buffer.
Reviewed-by: kvn, iveresov, never, tonyp, dholmes

     1 /*

     2  * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     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  */

    25 #ifndef SHARE_VM_OOPS_OBJARRAYKLASSKLASS_HPP

    26 #define SHARE_VM_OOPS_OBJARRAYKLASSKLASS_HPP

    28 #include "oops/arrayKlassKlass.hpp"

    29 #include "oops/objArrayKlass.hpp"

    31 // The objArrayKlassKlass is klass for all objArrayKlass'

    33 class objArrayKlassKlass : public arrayKlassKlass {

    34  public:

    35   // Testing

    36   virtual bool oop_is_objArrayKlass() const { return true; }

    38   // Dispatched operation

    39   int oop_size(oop obj) const { return objArrayKlass::cast(klassOop(obj))->object_size(); }

    40   int klass_oop_size() const  { return object_size(); }

    42   // Allocation

    43   DEFINE_ALLOCATE_PERMANENT(objArrayKlassKlass);

    44   static klassOop create_klass(TRAPS);

    45   klassOop allocate_objArray_klass(int n, KlassHandle element_klass, TRAPS);

    46   klassOop allocate_system_objArray_klass(TRAPS); // Used for bootstrapping in Universe::genesis

    48   // Casting from klassOop

    49   static objArrayKlassKlass* cast(klassOop k) {

    50     assert(k->klass_part()->oop_is_klass(), "cast to objArrayKlassKlass");

    51     return (objArrayKlassKlass*) k->klass_part();

    52   }

    54   // Sizing

    55   static int header_size()  { return oopDesc::header_size() + sizeof(objArrayKlassKlass)/HeapWordSize; }

    56   int object_size() const   { return align_object_size(header_size()); }

    58   // Garbage collection

    59   void oop_follow_contents(oop obj);

    60   int oop_adjust_pointers(oop obj);

    62   // Parallel Scavenge and Parallel Old

    63   PARALLEL_GC_DECLS

    65   // Iterators

    66   int oop_oop_iterate(oop obj, OopClosure* blk);

    67   int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr);

    69  private:

    70   // helpers

    71   static klassOop allocate_objArray_klass_impl(objArrayKlassKlassHandle this_oop, int n, KlassHandle element_klass, TRAPS);

    73  public:

    74   // Printing

    75   void oop_print_value_on(oop obj, outputStream* st);

    76 #ifndef PRODUCT

    77   void oop_print_on(oop obj, outputStream* st);

    78 #endif //PRODUCT

    80   // Verification

    81   const char* internal_name() const;

    82   void oop_verify_on(oop obj, outputStream* st);

    84 };

    86 #endif // SHARE_VM_OOPS_OBJARRAYKLASSKLASS_HPP

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/oops/objArrayKlassKlass.hpp@e1162778c1c8

src/share/vm/oops/objArrayKlassKlass.hpp