Mercurial > hg > truffle
annotate src/share/vm/runtime/unhandledOops.hpp @ 10246:194f52aa2f23
7176479: G1: JVM crashes on T5-8 system with 1.5 TB heap
Summary: Refactor G1's hot card cache and card counts table into their own files. Simplify the card counts table, including removing the encoding of the card index in each entry. The card counts table now has a 1:1 correspondence with the cards spanned by heap. Space for the card counts table is reserved from virtual memory (rather than C heap) during JVM startup and is committed/expanded when the heap is expanded. Changes were also reviewed-by Vitaly Davidovich.
Reviewed-by: tschatzl, jmasa
| author | johnc |
|---|---|
| date | Thu, 09 May 2013 11:16:39 -0700 |
| parents | f95d63e2154a |
| children | f9be75d21404 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 2005, 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 */ | |
| 1972 | 24 |
| 25 #ifndef SHARE_VM_RUNTIME_UNHANDLEDOOPS_HPP | |
| 26 #define SHARE_VM_RUNTIME_UNHANDLEDOOPS_HPP | |
| 27 | |
| 0 | 28 #ifdef CHECK_UNHANDLED_OOPS |
| 29 | |
| 30 // Detect unhanded oops in VM code | |
| 31 | |
| 32 // The design is that when an oop is declared on the stack as a local | |
| 33 // variable, the oop is actually a C++ struct with constructor and | |
| 34 // destructor. The constructor adds the oop address on a list | |
| 35 // off each thread and the destructor removes the oop. At a potential | |
| 36 // safepoint, the stack addresses of the local variable oops are trashed | |
| 37 // with a recognizeable value. If the local variable is used again, it | |
| 38 // will segfault, indicating an unsafe use of that oop. | |
| 39 // eg: | |
| 40 // oop o; //register &o on list | |
| 41 // funct(); // if potential safepoint - causes clear_naked_oops() | |
| 42 // // which trashes o above. | |
| 43 // o->do_something(); // Crashes because o is unsafe. | |
| 44 // | |
| 45 // This code implements the details of the unhandled oop list on the thread. | |
| 46 // | |
| 47 | |
| 48 class oop; | |
| 49 class Thread; | |
| 50 | |
| 51 class UnhandledOopEntry { | |
| 52 friend class UnhandledOops; | |
| 53 private: | |
| 54 oop* _oop_ptr; | |
| 55 bool _ok_for_gc; | |
| 56 address _pc; | |
| 57 public: | |
| 58 oop* oop_ptr() { return _oop_ptr; } | |
| 59 UnhandledOopEntry() : _oop_ptr(NULL), _ok_for_gc(false), _pc(NULL) {} | |
| 60 UnhandledOopEntry(oop* op, address pc) : | |
| 61 _oop_ptr(op), _ok_for_gc(false), _pc(pc) {} | |
| 62 }; | |
| 63 | |
| 64 | |
| 65 class UnhandledOops { | |
| 66 friend class Thread; | |
| 67 private: | |
| 68 Thread* _thread; | |
| 69 int _level; | |
| 70 GrowableArray<UnhandledOopEntry> *_oop_list; | |
| 71 void allow_unhandled_oop(oop* op); | |
| 72 void clear_unhandled_oops(); | |
| 73 UnhandledOops(Thread* thread); | |
| 74 ~UnhandledOops(); | |
| 75 | |
| 76 public: | |
| 77 static void dump_oops(UnhandledOops* list); | |
| 78 void register_unhandled_oop(oop* op, address pc); | |
| 79 void unregister_unhandled_oop(oop* op); | |
| 80 }; | |
| 81 | |
| 82 #ifdef _LP64 | |
| 83 const intptr_t BAD_OOP_ADDR = 0xfffffffffffffff1; | |
| 84 #else | |
| 85 const intptr_t BAD_OOP_ADDR = 0xfffffff1; | |
| 86 #endif // _LP64 | |
| 87 #endif // CHECK_UNHANDLED_OOPS | |
| 1972 | 88 |
| 89 #endif // SHARE_VM_RUNTIME_UNHANDLEDOOPS_HPP |