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src/share/vm/gc_implementation/g1/heapRegionSeq.inline.hpp@e1162778c1c8 (annotated)
src/share/vm/gc_implementation/g1/heapRegionSeq.inline.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 2963
- c3f1170908be
- 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
| ysr@777 | 1 | /* |
| stefank@2314 | 2 | * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. |
| ysr@777 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| ysr@777 | 4 | * |
| ysr@777 | 5 | * This code is free software; you can redistribute it and/or modify it |
| ysr@777 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| ysr@777 | 7 | * published by the Free Software Foundation. |
| ysr@777 | 8 | * |
| ysr@777 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| ysr@777 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| ysr@777 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| ysr@777 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| ysr@777 | 13 | * accompanied this code). |
| ysr@777 | 14 | * |
| ysr@777 | 15 | * You should have received a copy of the GNU General Public License version |
| ysr@777 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| ysr@777 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| ysr@777 | 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. |
| ysr@777 | 22 | * |
| ysr@777 | 23 | */ |
| ysr@777 | 24 | |
| stefank@2314 | 25 | #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_INLINE_HPP |
| stefank@2314 | 26 | #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_INLINE_HPP |
| stefank@2314 | 27 | |
| stefank@2314 | 28 | #include "gc_implementation/g1/heapRegionSeq.hpp" |
| stefank@2314 | 29 | |
| ysr@777 | 30 | inline HeapRegion* HeapRegionSeq::addr_to_region(const void* addr) { |
| ysr@777 | 31 | assert(_seq_bottom != NULL, "bad _seq_bottom in addr_to_region"); |
| ysr@777 | 32 | if ((char*) addr >= _seq_bottom) { |
| ysr@777 | 33 | size_t diff = (size_t) pointer_delta((HeapWord*) addr, |
| ysr@777 | 34 | (HeapWord*) _seq_bottom); |
| ysr@777 | 35 | int index = (int) (diff >> HeapRegion::LogOfHRGrainWords); |
| ysr@777 | 36 | assert(index >= 0, "invariant / paranoia"); |
| ysr@777 | 37 | if (index < _regions.length()) { |
| ysr@777 | 38 | HeapRegion* hr = _regions.at(index); |
| ysr@777 | 39 | assert(hr->is_in_reserved(addr), |
| ysr@777 | 40 | "addr_to_region is wrong..."); |
| ysr@777 | 41 | return hr; |
| ysr@777 | 42 | } |
| ysr@777 | 43 | } |
| ysr@777 | 44 | return NULL; |
| ysr@777 | 45 | } |
| stefank@2314 | 46 | |
| stefank@2314 | 47 | #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_INLINE_HPP |
