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1 /*
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2 * Copyright 2005 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 # include "incls/_precompiled.incl"
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26 # include "incls/_unhandledOops.cpp.incl"
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27
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28 #ifdef CHECK_UNHANDLED_OOPS
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29 const int free_list_size = 256;
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30
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31
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32 UnhandledOops::UnhandledOops(Thread* thread) {
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33 _thread = thread;
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34 _oop_list = new (ResourceObj::C_HEAP)
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35 GrowableArray<UnhandledOopEntry>(free_list_size, true);
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36 _level = 0;
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37 }
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38
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39 UnhandledOops::~UnhandledOops() {
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40 delete _oop_list;
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41 }
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42
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43
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44 void UnhandledOops::dump_oops(UnhandledOops *list) {
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45 for (int k = 0; k < list->_oop_list->length(); k++) {
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46 UnhandledOopEntry entry = list->_oop_list->at(k);
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47 tty->print(" " INTPTR_FORMAT, entry._oop_ptr);
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48 }
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49 tty->cr();
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50 }
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51
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52 // For debugging unhandled oop detector _in the debugger_
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53 // You don't want to turn it on in compiled code here.
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54 static bool unhandled_oop_print=0;
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55
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56 void UnhandledOops::register_unhandled_oop(oop* op, address pc) {
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57 if (!_thread->is_in_stack((address)op))
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58 return;
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59
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60 _level ++;
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61 if (unhandled_oop_print) {
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62 for (int i=0; i<_level; i++) tty->print(" ");
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63 tty->print_cr("r " INTPTR_FORMAT, op);
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64 }
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65 UnhandledOopEntry entry(op, pc);
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66 _oop_list->push(entry);
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67 }
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68
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69
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70 bool match_oop_entry(void *op, UnhandledOopEntry e) {
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71 return (e.oop_ptr() == op);
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72 }
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73
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74 // Mark unhandled oop as okay for GC - the containing struct has an oops_do and
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75 // for some reason the oop has to be on the stack.
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76 // May not be called for the current thread, as in the case of
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77 // VM_GetOrSetLocal in jvmti.
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78 void UnhandledOops::allow_unhandled_oop(oop* op) {
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79 assert (CheckUnhandledOops, "should only be called with checking option");
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80
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81 int i = _oop_list->find_at_end(op, match_oop_entry);
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82 assert(i!=-1, "safe for gc oop not in unhandled_oop_list");
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83
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84 UnhandledOopEntry entry = _oop_list->at(i);
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85 assert(!entry._ok_for_gc, "duplicate entry");
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86 entry._ok_for_gc = true;
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87 _oop_list->at_put(i, entry);
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88 }
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89
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90
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91 // Called by the oop destructor to remove unhandled oop from the thread's
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92 // oop list. All oops given are assumed to be on the list. If not,
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93 // there's a bug in the unhandled oop detector.
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94 void UnhandledOops::unregister_unhandled_oop(oop* op) {
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95 if (!_thread->is_in_stack((address)op)) return;
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96
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97 _level --;
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98 if (unhandled_oop_print) {
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99 for (int i=0; i<_level; i++) tty->print(" ");
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100 tty->print_cr("u "INTPTR_FORMAT, op);
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101 }
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102
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103 int i = _oop_list->find_at_end(op, match_oop_entry);
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104 assert(i!=-1, "oop not in unhandled_oop_list");
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105 _oop_list->remove_at(i);
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106 }
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107
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108 void UnhandledOops::clear_unhandled_oops() {
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109 assert (CheckUnhandledOops, "should only be called with checking option");
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110 if (_thread->is_gc_locked_out()) {
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111 return;
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112 }
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113 for (int k = 0; k < _oop_list->length(); k++) {
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114 UnhandledOopEntry entry = _oop_list->at(k);
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115 // If an entry is on the unhandled oop list but isn't on the stack
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116 // anymore, it must not have gotten unregistered properly and it's a bug
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117 // in the unhandled oop generator.
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118 if(!_thread->is_in_stack((address)entry._oop_ptr)) {
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119 tty->print_cr("oop_ptr is " INTPTR_FORMAT, (address)entry._oop_ptr);
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120 tty->print_cr("thread is " INTPTR_FORMAT " from pc " INTPTR_FORMAT,
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121 (address)_thread, (address)entry._pc);
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122 assert(false, "heap is corrupted by the unhandled oop detector");
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123 }
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124 // Set unhandled oops to a pattern that will crash distinctively
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125 if (!entry._ok_for_gc) *(intptr_t*)(entry._oop_ptr) = BAD_OOP_ADDR;
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126 }
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127 }
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128 #endif // CHECK_UNHANDLED_OOPS
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