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src/share/vm/runtime/unhandledOops.hpp@b985cbb00e68 (annotated)
src/share/vm/runtime/unhandledOops.hpp
Mon, 12 Aug 2019 18:30:40 +0300
- author
- apetushkov
- date
- Mon, 12 Aug 2019 18:30:40 +0300
- changeset 9858
- b985cbb00e68
- parent 6198
- 55fb97c4c58d
- child 6876
- 710a3c8b516e
- permissions
- -rw-r--r--
8223147: JFR Backport
8199712: Flight Recorder
8203346: JFR: Inconsistent signature of jfr_add_string_constant
8195817: JFR.stop should require name of recording
8195818: JFR.start should increase autogenerated name by one
8195819: Remove recording=x from jcmd JFR.check output
8203921: JFR thread sampling is missing fixes from JDK-8194552
8203929: Limit amount of data for JFR.dump
8203664: JFR start failure after AppCDS archive created with JFR StartFlightRecording
8003209: JFR events for network utilization
8207392: [PPC64] Implement JFR profiling
8202835: jfr/event/os/TestSystemProcess.java fails on missing events
Summary: Backport JFR from JDK11. Initial integration
Reviewed-by: neugens
| duke@435 | 1 | /* |
| mikael@6198 | 2 | * Copyright (c) 2005, 2013, 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 | */ |
| stefank@2314 | 24 | |
| stefank@2314 | 25 | #ifndef SHARE_VM_RUNTIME_UNHANDLEDOOPS_HPP |
| stefank@2314 | 26 | #define SHARE_VM_RUNTIME_UNHANDLEDOOPS_HPP |
| stefank@2314 | 27 | |
| duke@435 | 28 | #ifdef CHECK_UNHANDLED_OOPS |
| duke@435 | 29 | |
| duke@435 | 30 | // Detect unhanded oops in VM code |
| duke@435 | 31 | |
| duke@435 | 32 | // The design is that when an oop is declared on the stack as a local |
| duke@435 | 33 | // variable, the oop is actually a C++ struct with constructor and |
| duke@435 | 34 | // destructor. The constructor adds the oop address on a list |
| duke@435 | 35 | // off each thread and the destructor removes the oop. At a potential |
| duke@435 | 36 | // safepoint, the stack addresses of the local variable oops are trashed |
| duke@435 | 37 | // with a recognizeable value. If the local variable is used again, it |
| duke@435 | 38 | // will segfault, indicating an unsafe use of that oop. |
| duke@435 | 39 | // eg: |
| duke@435 | 40 | // oop o; //register &o on list |
| duke@435 | 41 | // funct(); // if potential safepoint - causes clear_naked_oops() |
| duke@435 | 42 | // // which trashes o above. |
| duke@435 | 43 | // o->do_something(); // Crashes because o is unsafe. |
| duke@435 | 44 | // |
| duke@435 | 45 | // This code implements the details of the unhandled oop list on the thread. |
| duke@435 | 46 | // |
| duke@435 | 47 | |
| duke@435 | 48 | class oop; |
| duke@435 | 49 | class Thread; |
| duke@435 | 50 | |
| minqi@5103 | 51 | class UnhandledOopEntry : public CHeapObj<mtThread> { |
| duke@435 | 52 | friend class UnhandledOops; |
| duke@435 | 53 | private: |
| duke@435 | 54 | oop* _oop_ptr; |
| duke@435 | 55 | bool _ok_for_gc; |
| duke@435 | 56 | address _pc; |
| duke@435 | 57 | public: |
| duke@435 | 58 | oop* oop_ptr() { return _oop_ptr; } |
| duke@435 | 59 | UnhandledOopEntry() : _oop_ptr(NULL), _ok_for_gc(false), _pc(NULL) {} |
| duke@435 | 60 | UnhandledOopEntry(oop* op, address pc) : |
| duke@435 | 61 | _oop_ptr(op), _ok_for_gc(false), _pc(pc) {} |
| duke@435 | 62 | }; |
| duke@435 | 63 | |
| duke@435 | 64 | |
| minqi@5103 | 65 | class UnhandledOops : public CHeapObj<mtThread> { |
| duke@435 | 66 | friend class Thread; |
| duke@435 | 67 | private: |
| duke@435 | 68 | Thread* _thread; |
| duke@435 | 69 | int _level; |
| duke@435 | 70 | GrowableArray<UnhandledOopEntry> *_oop_list; |
| duke@435 | 71 | void allow_unhandled_oop(oop* op); |
| duke@435 | 72 | void clear_unhandled_oops(); |
| duke@435 | 73 | UnhandledOops(Thread* thread); |
| duke@435 | 74 | ~UnhandledOops(); |
| duke@435 | 75 | |
| duke@435 | 76 | public: |
| duke@435 | 77 | static void dump_oops(UnhandledOops* list); |
| duke@435 | 78 | void register_unhandled_oop(oop* op, address pc); |
| duke@435 | 79 | void unregister_unhandled_oop(oop* op); |
| duke@435 | 80 | }; |
| duke@435 | 81 | |
| duke@435 | 82 | #ifdef _LP64 |
| duke@435 | 83 | const intptr_t BAD_OOP_ADDR = 0xfffffffffffffff1; |
| duke@435 | 84 | #else |
| duke@435 | 85 | const intptr_t BAD_OOP_ADDR = 0xfffffff1; |
| duke@435 | 86 | #endif // _LP64 |
| duke@435 | 87 | #endif // CHECK_UNHANDLED_OOPS |
| stefank@2314 | 88 | |
| stefank@2314 | 89 | #endif // SHARE_VM_RUNTIME_UNHANDLEDOOPS_HPP |
