jdk8-mips64-public/hotspot: src/cpu/sparc/vm/relocInfo

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 CPU_SPARC_VM_RELOCINFO_SPARC_HPP

    26 #define CPU_SPARC_VM_RELOCINFO_SPARC_HPP

    28   // machine-dependent parts of class relocInfo

    29  private:

    30   enum {

    31     // Since SPARC instructions are whole words,

    32     // the two low-order offset bits can always be discarded.

    33     offset_unit        =  4,

    35     // There is no need for format bits; the instructions are

    36     // sufficiently self-identifying.

    37 #ifndef _LP64

    38     format_width       =  0

    39 #else

    40     // Except narrow oops in 64-bits VM.

    41     format_width       =  1

    42 #endif

    43   };

    46 //Reconciliation History

    47 // 1.3 97/10/15 15:38:36 relocInfo_i486.hpp

    48 // 1.4 97/12/08 16:01:06 relocInfo_i486.hpp

    49 // 1.5 98/01/23 01:34:55 relocInfo_i486.hpp

    50 // 1.6 98/02/27 15:44:53 relocInfo_i486.hpp

    51 // 1.6 98/03/12 14:47:13 relocInfo_i486.hpp

    52 // 1.8 99/06/22 16:37:50 relocInfo_i486.hpp

    53 // 1.9 99/07/16 11:12:11 relocInfo_i486.hpp

    54 //End

    56 #endif // CPU_SPARC_VM_RELOCINFO_SPARC_HPP

src/cpu/sparc/vm/relocInfo_sparc.hpp@e1162778c1c8

src/cpu/sparc/vm/relocInfo_sparc.hpp

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

src/cpu/sparc/vm/relocInfo_sparc.hpp@e1162778c1c8

src/cpu/sparc/vm/relocInfo_sparc.hpp