1 /* 2 * Copyright (c) 2013, 2014, 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 * @key regression 27 * @key gc 28 * @bug 8027756 29 * @library /testlibrary /testlibrary/whitebox 30 * @build TestHumongousCodeCacheRoots 31 * @run main ClassFileInstaller sun.hotspot.WhiteBox 32 * sun.hotspot.WhiteBox$WhiteBoxPermission 33 * @summary Humongous objects may have references from the code cache 34 * @run main TestHumongousCodeCacheRoots 35 */ 36 37 import com.oracle.java.testlibrary.*; 38 import sun.hotspot.WhiteBox; 39 40 import java.util.ArrayList; 41 import java.util.Arrays; 42 43 class TestHumongousCodeCacheRootsHelper { 44 45 static final int n = 1000000; 46 static final int[] AA = new int[n]; 47 static final int[] BB = new int[n]; 48 49 public static void main(String args[]) throws Exception { 50 // do some work so that the compiler compiles this method, inlining the 51 // reference to the integer array (which is a humonguous object) into 52 // the code cache. 53 for(int i = 0; i < n; i++) { 54 AA[i] = 0; 55 BB[i] = 0; 56 } 57 // trigger a GC that checks that the verification code allows humongous 58 // objects with code cache roots; objects should be all live here. 59 System.gc(); 60 61 // deoptimize everyhing: this should make all compiled code zombies. 62 WhiteBox wb = WhiteBox.getWhiteBox(); 63 wb.deoptimizeAll(); 64 65 // trigger a GC that checks that the verification code allows humongous 66 // objects with code cache roots; objects should be all live here. 67 System.gc(); 68 69 // wait a little for the code cache sweeper to try to clean up zombie nmethods 70 // and unregister the code roots. 71 try { Thread.sleep(5000); } catch (InterruptedException ex) { } 72 73 // do some work on the arrays to make sure that they need to be live after the GCs 74 for(int i = 0; i < n; i++) { 75 AA[i] = 1; 76 BB[i] = 10; 77 } 78 79 System.out.println(); 80 } 81 } 82 83 public class TestHumongousCodeCacheRoots { 84 85 /** 86 * Executes a class in a new VM process with the given parameters. 87 * @param vmargs Arguments to the VM to run 88 * @param classname Name of the class to run 89 * @param arguments Arguments to the class 90 * @param useTestDotJavaDotOpts Use test.java.opts as part of the VM argument string 91 * @return The OutputAnalyzer with the results for the invocation. 92 */ 93 public static OutputAnalyzer runWhiteBoxTest(String[] vmargs, String classname, String[] arguments, boolean useTestDotJavaDotOpts) throws Exception { 94 ArrayList<String> finalargs = new ArrayList<String>(); 95 96 String[] whiteboxOpts = new String[] { 97 "-Xbootclasspath/a:.", 98 "-XX:+UnlockDiagnosticVMOptions", "-XX:+WhiteBoxAPI", 99 "-cp", System.getProperty("java.class.path"), 100 }; 101 102 if (useTestDotJavaDotOpts) { 103 // System.getProperty("test.java.opts") is '' if no options is set, 104 // we need to skip such a result 105 String[] externalVMOpts = new String[0]; 106 if (System.getProperty("test.java.opts") != null && System.getProperty("test.java.opts").length() != 0) { 107 externalVMOpts = System.getProperty("test.java.opts").split(" "); 108 } 109 finalargs.addAll(Arrays.asList(externalVMOpts)); 110 } 111 112 finalargs.addAll(Arrays.asList(vmargs)); 113 finalargs.addAll(Arrays.asList(whiteboxOpts)); 114 finalargs.add(classname); 115 finalargs.addAll(Arrays.asList(arguments)); 116 117 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(finalargs.toArray(new String[0])); 118 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 119 output.shouldHaveExitValue(0); 120 121 return output; 122 } 123 124 public static void runTest(String compiler, String[] other) throws Exception { 125 ArrayList<String> joined = new ArrayList<String>(); 126 joined.add(compiler); 127 joined.addAll(Arrays.asList(other)); 128 runWhiteBoxTest(joined.toArray(new String[0]), TestHumongousCodeCacheRootsHelper.class.getName(), 129 new String[] {}, false); 130 } 131 132 public static void main(String[] args) throws Exception { 133 final String[] baseArguments = new String[] { 134 "-XX:+UseG1GC", "-XX:G1HeapRegionSize=1M", "-Xmx100M", // make sure we get a humongous region 135 "-XX:+UnlockDiagnosticVMOptions", 136 "-XX:InitiatingHeapOccupancyPercent=1", // strong code root marking 137 "-XX:+G1VerifyHeapRegionCodeRoots", "-XX:+VerifyAfterGC", // make sure that verification is run 138 "-XX:NmethodSweepFraction=1", "-XX:NmethodSweepCheckInterval=1", // make the code cache sweep more predictable 139 }; 140 runTest("-client", baseArguments); 141 runTest("-server", baseArguments); 142 } 143 } 144