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