1 /* 2 * Copyright (c) 2003, 2018, 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 * Unit tests for JVMTI IterateOverReachableObjects and 26 * IterateOverObjectsReachableFromObject functions. 27 * 28 */ 29 30 package nsk.jvmti.unit.heap; 31 32 import nsk.share.jvmti.unit.*; 33 import java.io.PrintStream; 34 35 public class HeapWalkTests { 36 37 final static int JCK_STATUS_BASE = 95; 38 final static int PASSED = 0; 39 final static int FAILED = 2; 40 main(String args[])41 public static void main(String args[]) { 42 args = nsk.share.jvmti.JVMTITest.commonInit(args); 43 44 // produce JCK-like exit status. 45 System.exit(run(args, System.out) + JCK_STATUS_BASE); 46 } 47 run(String args[], PrintStream out)48 public static int run(String args[], PrintStream out) { 49 test1(); 50 test2(); 51 test3(); 52 return PASSED; 53 } 54 test1()55 private static void test1() { 56 long tag; 57 58 // This test uses the heap_root_callback to tag all the roots 59 60 // It then examines a few known roots and checks that they 61 // are tagged. 62 63 // create a global reference 64 Object o = new Object(); 65 Heap.newGlobalRef(o); 66 67 // make sure current thread isn't tagged 68 Heap.setTag(Thread.currentThread(), 0); 69 70 Heap.setHeapRootCallback(); 71 Heap.iterateOverReachableObjects(); 72 73 // o must be JNI global - there's no other way it can be a root 74 75 tag = Heap.getTag(o); 76 77 if (tag != Heap.JVMTI_HEAP_ROOT_JNI_GLOBAL) { 78 throw new RuntimeException("JNI global should have been tagged"); 79 } 80 81 // Current thread is root but can't assume it will be 82 // tagged with JVMTI_HEAP_ROOT_JNI_GLOBAL 83 84 tag = Heap.getTag(Thread.currentThread()); 85 if (tag == 0) { 86 throw new RuntimeException("Current thread isn't tagged"); 87 } 88 } 89 test2()90 private static void test2() { 91 long tag; 92 93 // This test uses the stack_ref_callback to tag all references 94 // from the thread stacks. The callback tags all objects with the tag 95 // of the thread. 96 97 Object o = new Object(); 98 99 Heap.setTag(Thread.currentThread(), 888); 100 101 Heap.setStackRefCallback(); 102 Heap.iterateOverReachableObjects(); 103 104 tag = Heap.getTag(o); 105 if (tag != 888) { 106 throw new RuntimeException("stack local not tagged correctly"); 107 } 108 } 109 110 111 // used by test3 112 static class Foo { 113 private Object fld; 114 Foo()115 Foo() { 116 fld = new Object(); 117 } 118 field()119 Object field() { 120 return fld; 121 } 122 123 public static Object static_field = new Object(); 124 } 125 126 private static int failures = 0; 127 check(Object o, long tag)128 private static void check(Object o, long tag) { 129 long actual_tag = Heap.getTag(o); 130 if (actual_tag != tag) { 131 if (actual_tag == 0) { 132 System.err.println(o + " is not tagged!"); 133 } else { 134 System.err.println(o + " is incorrectly tagged"); 135 } 136 failures++; 137 } 138 } 139 test3()140 private static void test3() { 141 long tag; 142 143 // This test tags an object, and then calls IterateOverObjectsReachableFromObject 144 // The callback tags all objects with a tag value of 777. 145 146 Foo foo = new Foo(); 147 148 Heap.setObjectRefCallback(); 149 Heap.iterateOverObjectsReachableFromObject(foo); 150 151 check(Foo.class, 777); 152 check(Foo.static_field, 777); 153 check(foo.field(), 777); 154 155 if (failures > 0) { 156 throw new RuntimeException("IterateOverObjectsReachableFromObject test failed"); 157 } 158 } 159 } 160