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src/cpu/sparc/vm/interpreter_sparc.hpp@e1162778c1c8 (annotated)
src/cpu/sparc/vm/interpreter_sparc.hpp
Thu, 07 Apr 2011 09:53:20 -0700
- author
- johnc
- date
- Thu, 07 Apr 2011 09:53:20 -0700
- changeset 2781
- e1162778c1c8
- parent 2314
- f95d63e2154a
- child 6876
- 710a3c8b516e
- permissions
- -rw-r--r--
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
| duke@435 | 1 | /* |
| trims@1907 | 2 | * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
| duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| duke@435 | 4 | * |
| duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
| duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| duke@435 | 7 | * published by the Free Software Foundation. |
| duke@435 | 8 | * |
| duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| duke@435 | 13 | * accompanied this code). |
| duke@435 | 14 | * |
| duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
| duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| duke@435 | 18 | * |
| trims@1907 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| trims@1907 | 20 | * or visit www.oracle.com if you need additional information or have any |
| trims@1907 | 21 | * questions. |
| duke@435 | 22 | * |
| duke@435 | 23 | */ |
| duke@435 | 24 | |
| stefank@2314 | 25 | #ifndef CPU_SPARC_VM_INTERPRETER_SPARC_HPP |
| stefank@2314 | 26 | #define CPU_SPARC_VM_INTERPRETER_SPARC_HPP |
| stefank@2314 | 27 | |
| duke@435 | 28 | public: |
| duke@435 | 29 | |
| twisti@1861 | 30 | static int expr_offset_in_bytes(int i) { return stackElementSize * i + wordSize; } |
| duke@435 | 31 | |
| duke@435 | 32 | // Stack index relative to tos (which points at value) |
| twisti@1861 | 33 | static int expr_index_at(int i) { return stackElementWords * i; } |
| duke@435 | 34 | |
| duke@435 | 35 | // Already negated by c++ interpreter |
| twisti@1861 | 36 | static int local_index_at(int i) { |
| twisti@1861 | 37 | assert(i <= 0, "local direction already negated"); |
| twisti@1861 | 38 | return stackElementWords * i; |
| duke@435 | 39 | } |
| stefank@2314 | 40 | |
| stefank@2314 | 41 | #endif // CPU_SPARC_VM_INTERPRETER_SPARC_HPP |
