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1 /* |
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2 * Copyright (c) 2019, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 |
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24 #include "precompiled.hpp" |
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25 #include "classfile/systemDictionary.hpp" |
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26 #include "memory/resourceArea.hpp" |
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27 #include "memory/universe.hpp" |
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28 #include "oops/oop.inline.hpp" |
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29 #include "runtime/atomic.hpp" |
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30 #include "runtime/biasedLocking.hpp" |
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31 #include "runtime/interfaceSupport.inline.hpp" |
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32 #include "runtime/orderAccess.hpp" |
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33 #include "runtime/os.hpp" |
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34 #include "runtime/synchronizer.hpp" |
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35 #include "runtime/semaphore.inline.hpp" |
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36 #include "threadHelper.inline.hpp" |
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37 #include "unittest.hpp" |
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38 #include "utilities/globalDefinitions.hpp" |
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39 #include "utilities/ostream.hpp" |
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40 |
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41 // The test doesn't work for PRODUCT because it needs WizardMode |
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42 #ifndef PRODUCT |
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43 static bool test_pattern(stringStream* st, const char* pattern) { |
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44 return (strstr(st->as_string(), pattern) != NULL); |
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45 } |
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46 |
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47 static void assert_test_pattern(Handle object, const char* pattern) { |
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48 stringStream st; |
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49 object->print_on(&st); |
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50 ASSERT_TRUE(test_pattern(&st, pattern)) << pattern << " not in " << st.as_string(); |
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51 } |
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52 |
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53 static void assert_not_test_pattern(Handle object, const char* pattern) { |
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54 stringStream st; |
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55 object->print_on(&st); |
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56 ASSERT_FALSE(test_pattern(&st, pattern)) << pattern << " found in " << st.as_string(); |
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57 } |
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58 |
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59 class LockerThread : public JavaTestThread { |
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60 oop _obj; |
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61 public: |
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62 LockerThread(Semaphore* post, oop obj) : JavaTestThread(post), _obj(obj) {} |
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63 virtual ~LockerThread() {} |
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64 |
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65 void main_run() { |
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66 Thread* THREAD = Thread::current(); |
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67 HandleMark hm(THREAD); |
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68 Handle h_obj(THREAD, _obj); |
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69 ResourceMark rm(THREAD); |
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70 |
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71 // Wait gets the lock inflated. |
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72 // The object will stay locked for the context of 'ol' so the lock will |
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73 // still be inflated after the notify_all() call. Deflation can't happen |
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74 // while an ObjectMonitor is "busy" and being locked is the most "busy" |
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75 // state we have... |
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76 ObjectLocker ol(h_obj, THREAD); |
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77 ol.notify_all(THREAD); |
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78 assert_test_pattern(h_obj, "monitor"); |
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79 } |
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80 }; |
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81 |
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82 |
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83 TEST_VM(markWord, printing) { |
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84 JavaThread* THREAD = JavaThread::current(); |
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85 ThreadInVMfromNative invm(THREAD); |
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86 ResourceMark rm(THREAD); |
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87 |
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88 if (!UseBiasedLocking || !BiasedLocking::enabled()) { |
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89 // Can't test this with biased locking disabled. |
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90 return; |
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91 } |
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92 |
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93 oop obj = SystemDictionary::Byte_klass()->allocate_instance(THREAD); |
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94 |
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95 FlagSetting fs(WizardMode, true); |
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96 |
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97 HandleMark hm(THREAD); |
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98 Handle h_obj(THREAD, obj); |
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99 |
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100 // Biased locking is initially enabled for this java.lang.Byte object. |
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101 assert_test_pattern(h_obj, "is_biased"); |
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102 |
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103 // Lock using biased locking. |
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104 BasicObjectLock lock; |
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105 lock.set_obj(obj); |
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106 markWord prototype_header = obj->klass()->prototype_header(); |
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107 markWord mark = obj->mark(); |
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108 markWord biased_mark = markWord::encode((JavaThread*) THREAD, mark.age(), prototype_header.bias_epoch()); |
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109 obj->set_mark(biased_mark); |
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110 // Look for the biased_locker in markWord, not prototype_header. |
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111 #ifdef _LP64 |
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112 assert_not_test_pattern(h_obj, "mark(is_biased biased_locker=0x0000000000000000"); |
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113 #else |
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114 assert_not_test_pattern(h_obj, "mark(is_biased biased_locker=0x00000000"); |
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115 #endif |
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116 |
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117 // Same thread tries to lock it again. |
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118 { |
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119 ObjectLocker ol(h_obj, THREAD); |
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120 assert_test_pattern(h_obj, "locked"); |
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121 } |
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122 |
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123 // This is no longer biased, because ObjectLocker revokes the bias. |
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124 assert_test_pattern(h_obj, "is_neutral no_hash"); |
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125 |
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126 // Wait gets the lock inflated. |
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127 { |
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128 ObjectLocker ol(h_obj, THREAD); |
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129 |
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130 Semaphore done(0); |
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131 LockerThread* st; |
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132 st = new LockerThread(&done, h_obj()); |
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133 st->doit(); |
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134 |
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135 ol.wait(THREAD); |
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136 assert_test_pattern(h_obj, "monitor"); |
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137 done.wait_with_safepoint_check(THREAD); // wait till the thread is done. |
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138 } |
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139 |
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140 // Make the object older. Not all GCs use this field. |
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141 Universe::heap()->collect(GCCause::_java_lang_system_gc); |
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142 if (UseParallelGC) { |
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143 assert_test_pattern(h_obj, "is_neutral no_hash age 1"); |
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144 } |
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145 |
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146 // Hash the object then print it. |
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147 intx hash = h_obj->identity_hash(); |
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148 assert_test_pattern(h_obj, "is_neutral hash=0x"); |
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149 } |
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150 #endif // PRODUCT |