1 /* 2 * Copyright (c) 2007, 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 * @test 26 * 27 * @summary converted from VM Testbase nsk/jvmti/scenarios/hotswap/HS204/hs204t003. 28 * VM Testbase keywords: [quick, jpda, jvmti, onload_only_caps, noras, redefine, feature_hotswap] 29 * VM Testbase readme: 30 * Description :: 31 * The test pop initializer frame, redefines class and pops thread's current frame (constructor). 32 * The test enables ClassPrepare event. A TempThread (dummy thread) is created and 33 * it starts creating MyThread object (It can even be normal class doesn;t needed to be a thread). 34 * On receiving ClassPrepare event for MyThread, It would enable field access event 35 * (JVMTI_EVENT_FIELD_ACCESS), adds access watch for static field 'intState' of MyThread. 36 * Inside the MyThread constructor, watch field is accessed(incremented). Which causes callback. 37 * Callback for 'FiledAccess', this redefines ./MyThread.java class to ./newclass00/MyThread.java 38 * and suspends the currently executing thread ('TempThread'). 39 * The main thread pops executing frame in suspended thread ('TempThread') and resumes its execution. 40 * 'TempThread' would reenter to constructor again. 41 * Test is said to be pass, if MyThread is from ./newclass00/MyThread. 42 * The notes from removed README 43 * 1. Enable event ClassPrepare. 44 * 2. Upon ClassPrepare occurrence, enable FieldAccessWatch for a field to be initialized by the initializer. 45 * 3. Upon accessing the field by the initializer, redefine the class and pop a currently executed 46 * frame of the initializer within incoming FieldAccess callback. 47 * 48 * @library /vmTestbase 49 * /test/lib 50 * @run driver jdk.test.lib.FileInstaller . . 51 * @build nsk.jvmti.scenarios.hotswap.HS204.hs204t003.hs204t003 52 * 53 * @comment compile newclassXX to bin/newclassXX 54 * @run driver nsk.share.ExtraClassesBuilder 55 * newclass00 56 * 57 * @build ExecDriver 58 * @run main/othervm/native PropertyResolvingWrapper ExecDriver --java 59 * "-agentlib:hs204t003=pathToNewByteCode=./bin -waittime=5 package=nsk samples=100 mode=compiled" 60 * nsk.jvmti.scenarios.hotswap.HS204.hs204t003.hs204t003 61 */ 62 63 package nsk.jvmti.scenarios.hotswap.HS204.hs204t003; 64 65 import nsk.share.jvmti.RedefineAgent; 66 public class hs204t003 extends RedefineAgent { popFrame(Thread thread)67 public native boolean popFrame(Thread thread) ; 68 hs204t003(String[]arg)69 public hs204t003(String[]arg) { 70 super(arg); 71 } 72 main(String[] arg)73 public static void main(String[] arg) { 74 arg = nsk.share.jvmti.JVMTITest.commonInit(arg); 75 76 hs204t003 hsCase = new hs204t003(arg); 77 System.exit(hsCase.runAgent()); 78 } 79 agentMethod()80 public boolean agentMethod() { 81 boolean passed = false; 82 MyThread mthread =null; 83 try { 84 TempThread temp = new TempThread(); 85 temp.start(); 86 Thread.sleep(10000); 87 popFrame(temp); 88 temp.join(); 89 mthread = temp.mthread; 90 mthread.start(); 91 mthread.join(); 92 } catch(Exception exp) { 93 exp.printStackTrace(); 94 } finally { 95 if ( mthread != null ) { 96 System.out.println(" agentMethod() :: field state = "+mthread.getIntState()); 97 if ( redefineAttempted() && 98 isRedefined() && 99 mthread.getIntState() == 10 && 100 agentStatus() ) { 101 passed = true; 102 } 103 } 104 } 105 System.out.println(" agentMethod() = "+passed+"."); 106 return passed; 107 } 108 } 109 class TempThread extends Thread { 110 public MyThread mthread; TempThread()111 public TempThread() { 112 super("TempThread."); 113 } 114 run()115 public void run() { 116 System.out.println(" run for TempThread "); 117 mthread = new MyThread(); 118 } 119 120 } 121