Mercurial > jdk8-mips64-public > hotspot / annotate
src/share/vm/oops/markOop.cpp@63997f575155 (annotated)
src/share/vm/oops/markOop.cpp
Wed, 30 Mar 2011 07:47:19 -0700
- author
- never
- date
- Wed, 30 Mar 2011 07:47:19 -0700
- changeset 2693
- 63997f575155
- parent 2314
- f95d63e2154a
- child 3156
- f08d439fab8c
- permissions
- -rw-r--r--
7031614: jmap -permstat fails with java.lang.InternalError in sun.jvm.hotspot.oops.OopField.getValue
Reviewed-by: kvn, dcubed
| duke@435 | 1 | /* |
| stefank@2314 | 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 | #include "precompiled.hpp" |
| stefank@2314 | 26 | #include "oops/markOop.hpp" |
| stefank@2314 | 27 | #ifdef TARGET_OS_FAMILY_linux |
| stefank@2314 | 28 | # include "thread_linux.inline.hpp" |
| stefank@2314 | 29 | #endif |
| stefank@2314 | 30 | #ifdef TARGET_OS_FAMILY_solaris |
| stefank@2314 | 31 | # include "thread_solaris.inline.hpp" |
| stefank@2314 | 32 | #endif |
| stefank@2314 | 33 | #ifdef TARGET_OS_FAMILY_windows |
| stefank@2314 | 34 | # include "thread_windows.inline.hpp" |
| stefank@2314 | 35 | #endif |
| duke@435 | 36 | |
| duke@435 | 37 | |
| duke@435 | 38 | void markOopDesc::print_on(outputStream* st) const { |
| duke@435 | 39 | if (is_locked()) { |
| duke@435 | 40 | st->print("locked(0x%lx)->", value()); |
| duke@435 | 41 | markOop(*(markOop*)value())->print_on(st); |
| duke@435 | 42 | } else { |
| jrose@1474 | 43 | assert(is_unlocked() || has_bias_pattern(), "just checking"); |
| duke@435 | 44 | st->print("mark("); |
| jrose@1474 | 45 | if (has_bias_pattern()) st->print("biased,"); |
| duke@435 | 46 | st->print("hash %#lx,", hash()); |
| duke@435 | 47 | st->print("age %d)", age()); |
| duke@435 | 48 | } |
| duke@435 | 49 | } |
| dcubed@483 | 50 | |
| dcubed@483 | 51 | |
| dcubed@483 | 52 | // Give advice about whether the oop that contains this markOop |
| dcubed@483 | 53 | // should be cached or not. |
| dcubed@483 | 54 | bool markOopDesc::should_not_be_cached() const { |
| dcubed@483 | 55 | // the cast is because decode_pointer() isn't marked const |
| dcubed@483 | 56 | if (is_marked() && ((markOopDesc *)this)->decode_pointer() != NULL) { |
| dcubed@483 | 57 | // If the oop containing this markOop is being forwarded, then |
| dcubed@483 | 58 | // we are in the middle of GC and we do not want the containing |
| dcubed@483 | 59 | // oop to be added to a cache. We have no way of knowing whether |
| dcubed@483 | 60 | // the cache has already been visited by the current GC phase so |
| dcubed@483 | 61 | // we don't know whether the forwarded oop will be properly |
| dcubed@483 | 62 | // processed in this phase. If the forwarded oop is not properly |
| dcubed@483 | 63 | // processed, then we'll see strange crashes or asserts during |
| dcubed@483 | 64 | // the next GC run because the markOop will contain an unexpected |
| dcubed@483 | 65 | // value. |
| dcubed@483 | 66 | // |
| dcubed@483 | 67 | // This situation has been seen when we are GC'ing a methodOop |
| dcubed@483 | 68 | // because we use the methodOop while we're GC'ing it. Scary |
| dcubed@483 | 69 | // stuff. Some of the uses the methodOop cause the methodOop to |
| dcubed@483 | 70 | // be added to the OopMapCache in the instanceKlass as a side |
| dcubed@483 | 71 | // effect. This check lets the cache maintainer know when a |
| dcubed@483 | 72 | // cache addition would not be safe. |
| dcubed@483 | 73 | return true; |
| dcubed@483 | 74 | } |
| dcubed@483 | 75 | |
| dcubed@483 | 76 | // caching the containing oop should be just fine |
| dcubed@483 | 77 | return false; |
| dcubed@483 | 78 | } |
