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comparison: src/share/vm/runtime/unhandledOops.cpp
src/share/vm/runtime/unhandledOops.cpp
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| 1 /* | |
| 2 * Copyright (c) 2005, 2014, Oracle and/or its affiliates. All rights reserved. | |
| 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 * | |
| 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 20 * or visit www.oracle.com if you need additional information or have any | |
| 21 * questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 #include "precompiled.hpp" | |
| 26 #include "gc_interface/collectedHeap.hpp" | |
| 27 #include "memory/gcLocker.inline.hpp" | |
| 28 #include "memory/universe.hpp" | |
| 29 #include "oops/oop.inline.hpp" | |
| 30 #include "runtime/thread.hpp" | |
| 31 #include "runtime/unhandledOops.hpp" | |
| 32 #include "utilities/globalDefinitions.hpp" | |
| 33 | |
| 34 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC | |
| 35 | |
| 36 #ifdef CHECK_UNHANDLED_OOPS | |
| 37 const int free_list_size = 256; | |
| 38 | |
| 39 | |
| 40 UnhandledOops::UnhandledOops(Thread* thread) { | |
| 41 _thread = thread; | |
| 42 _oop_list = new (ResourceObj::C_HEAP, mtInternal) | |
| 43 GrowableArray<UnhandledOopEntry>(free_list_size, true); | |
| 44 _level = 0; | |
| 45 } | |
| 46 | |
| 47 UnhandledOops::~UnhandledOops() { | |
| 48 delete _oop_list; | |
| 49 } | |
| 50 | |
| 51 | |
| 52 void UnhandledOops::dump_oops(UnhandledOops *list) { | |
| 53 for (int k = 0; k < list->_oop_list->length(); k++) { | |
| 54 UnhandledOopEntry entry = list->_oop_list->at(k); | |
| 55 tty->print(" " INTPTR_FORMAT, entry._oop_ptr); | |
| 56 } | |
| 57 tty->cr(); | |
| 58 } | |
| 59 | |
| 60 // For debugging unhandled oop detector _in the debugger_ | |
| 61 // You don't want to turn it on in compiled code here. | |
| 62 static bool unhandled_oop_print=0; | |
| 63 | |
| 64 void UnhandledOops::register_unhandled_oop(oop* op, address pc) { | |
| 65 if (!_thread->is_in_stack((address)op)) | |
| 66 return; | |
| 67 | |
| 68 _level ++; | |
| 69 if (unhandled_oop_print) { | |
| 70 for (int i=0; i<_level; i++) tty->print(" "); | |
| 71 tty->print_cr("r " INTPTR_FORMAT, op); | |
| 72 } | |
| 73 UnhandledOopEntry entry(op, pc); | |
| 74 _oop_list->push(entry); | |
| 75 } | |
| 76 | |
| 77 | |
| 78 bool match_oop_entry(void *op, UnhandledOopEntry e) { | |
| 79 return (e.oop_ptr() == op); | |
| 80 } | |
| 81 | |
| 82 // Mark unhandled oop as okay for GC - the containing struct has an oops_do and | |
| 83 // for some reason the oop has to be on the stack. | |
| 84 // May not be called for the current thread, as in the case of | |
| 85 // VM_GetOrSetLocal in jvmti. | |
| 86 void UnhandledOops::allow_unhandled_oop(oop* op) { | |
| 87 assert (CheckUnhandledOops, "should only be called with checking option"); | |
| 88 | |
| 89 int i = _oop_list->find_from_end(op, match_oop_entry); | |
| 90 assert(i!=-1, "safe for gc oop not in unhandled_oop_list"); | |
| 91 | |
| 92 UnhandledOopEntry entry = _oop_list->at(i); | |
| 93 assert(!entry._ok_for_gc, "duplicate entry"); | |
| 94 entry._ok_for_gc = true; | |
| 95 _oop_list->at_put(i, entry); | |
| 96 } | |
| 97 | |
| 98 | |
| 99 // Called by the oop destructor to remove unhandled oop from the thread's | |
| 100 // oop list. All oops given are assumed to be on the list. If not, | |
| 101 // there's a bug in the unhandled oop detector. | |
| 102 void UnhandledOops::unregister_unhandled_oop(oop* op) { | |
| 103 if (!_thread->is_in_stack((address)op)) return; | |
| 104 | |
| 105 _level --; | |
| 106 if (unhandled_oop_print) { | |
| 107 for (int i=0; i<_level; i++) tty->print(" "); | |
| 108 tty->print_cr("u "INTPTR_FORMAT, op); | |
| 109 } | |
| 110 | |
| 111 int i = _oop_list->find_from_end(op, match_oop_entry); | |
| 112 assert(i!=-1, "oop not in unhandled_oop_list"); | |
| 113 _oop_list->remove_at(i); | |
| 114 } | |
| 115 | |
| 116 void UnhandledOops::clear_unhandled_oops() { | |
| 117 assert (CheckUnhandledOops, "should only be called with checking option"); | |
| 118 | |
| 119 for (int k = 0; k < _oop_list->length(); k++) { | |
| 120 UnhandledOopEntry entry = _oop_list->at(k); | |
| 121 // If an entry is on the unhandled oop list but isn't on the stack | |
| 122 // anymore, it must not have gotten unregistered properly and it's a bug | |
| 123 // in the unhandled oop generator. | |
| 124 if(!_thread->is_in_stack((address)entry._oop_ptr)) { | |
| 125 tty->print_cr("oop_ptr is " INTPTR_FORMAT, (address)entry._oop_ptr); | |
| 126 tty->print_cr("thread is " INTPTR_FORMAT " from pc " INTPTR_FORMAT, | |
| 127 (address)_thread, (address)entry._pc); | |
| 128 assert(false, "heap is corrupted by the unhandled oop detector"); | |
| 129 } | |
| 130 // Set unhandled oops to a pattern that will crash distinctively | |
| 131 if (!entry._ok_for_gc) *(intptr_t*)(entry._oop_ptr) = BAD_OOP_ADDR; | |
| 132 } | |
| 133 } | |
| 134 #endif // CHECK_UNHANDLED_OOPS |
