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