Mercurial > hg > truffle
annotate src/cpu/x86/vm/javaFrameAnchor_x86.hpp @ 20504:6948da6d7c13
8052172: Evacuation failure handling in G1 does not evacuate all objects if -XX:-G1DeferredRSUpdate is set
Summary: Remove -XX:-G1DeferredRSUpdate functionality as it is racy. During evacuation failure handling, threads where evacuation failure handling occurred may try to add remembered sets to regions which remembered sets are currently being scanned. The iterator to handle the remembered set scan does not support addition of entries during scan and so may skip valid references.
Reviewed-by: iveresov, brutisso, mgerdin
| author | tschatzl |
|---|---|
| date | Tue, 30 Sep 2014 09:44:36 +0200 |
| parents | f95d63e2154a |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef CPU_X86_VM_JAVAFRAMEANCHOR_X86_HPP |
| 26 #define CPU_X86_VM_JAVAFRAMEANCHOR_X86_HPP | |
| 27 | |
| 0 | 28 private: |
| 29 | |
| 30 // FP value associated with _last_Java_sp: | |
| 31 intptr_t* volatile _last_Java_fp; // pointer is volatile not what it points to | |
| 32 | |
| 33 public: | |
| 34 // Each arch must define reset, save, restore | |
| 35 // These are used by objects that only care about: | |
| 36 // 1 - initializing a new state (thread creation, javaCalls) | |
| 37 // 2 - saving a current state (javaCalls) | |
| 38 // 3 - restoring an old state (javaCalls) | |
| 39 | |
| 40 void clear(void) { | |
| 41 // clearing _last_Java_sp must be first | |
| 42 _last_Java_sp = NULL; | |
| 43 // fence? | |
| 44 _last_Java_fp = NULL; | |
| 45 _last_Java_pc = NULL; | |
| 46 } | |
| 47 | |
| 48 void copy(JavaFrameAnchor* src) { | |
| 49 // In order to make sure the transition state is valid for "this" | |
| 50 // We must clear _last_Java_sp before copying the rest of the new data | |
| 51 // | |
| 52 // Hack Alert: Temporary bugfix for 4717480/4721647 | |
| 53 // To act like previous version (pd_cache_state) don't NULL _last_Java_sp | |
| 54 // unless the value is changing | |
| 55 // | |
| 56 if (_last_Java_sp != src->_last_Java_sp) | |
| 57 _last_Java_sp = NULL; | |
| 58 | |
| 59 _last_Java_fp = src->_last_Java_fp; | |
| 60 _last_Java_pc = src->_last_Java_pc; | |
| 61 // Must be last so profiler will always see valid frame if has_last_frame() is true | |
| 62 _last_Java_sp = src->_last_Java_sp; | |
| 63 } | |
| 64 | |
| 65 // Always walkable | |
| 66 bool walkable(void) { return true; } | |
| 67 // Never any thing to do since we are always walkable and can find address of return addresses | |
| 68 void make_walkable(JavaThread* thread) { } | |
| 69 | |
| 70 intptr_t* last_Java_sp(void) const { return _last_Java_sp; } | |
| 71 | |
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72 address last_Java_pc(void) { return _last_Java_pc; } |
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73 |
| 0 | 74 private: |
| 75 | |
| 76 static ByteSize last_Java_fp_offset() { return byte_offset_of(JavaFrameAnchor, _last_Java_fp); } | |
| 77 | |
| 78 public: | |
| 79 | |
| 80 void set_last_Java_sp(intptr_t* sp) { _last_Java_sp = sp; } | |
| 81 | |
| 82 intptr_t* last_Java_fp(void) { return _last_Java_fp; } | |
| 83 // Assert (last_Java_sp == NULL || fp == NULL) | |
| 84 void set_last_Java_fp(intptr_t* fp) { _last_Java_fp = fp; } | |
| 1972 | 85 |
| 86 #endif // CPU_X86_VM_JAVAFRAMEANCHOR_X86_HPP |