1 /*
   2  * Copyright (c) 2014 SAP SE. 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  * @bug 8038048
  27  * @summary assert(null_obj->escape_state() == PointsToNode::NoEscape,etc)
  28  * @modules java.base/jdk.internal.misc
  29  *
  30  * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+DoEscapeAnalysis
  31  *      -XX:-TieredCompilation -Xbatch
  32  *      compiler.escapeAnalysis.TestUnsafePutAddressNullObjMustNotEscape
  33  *
  34  * @author Richard Reingruber richard DOT reingruber AT sap DOT com
  35  */
  36 
  37 package compiler.escapeAnalysis;
  38 
  39 import jdk.internal.misc.Unsafe;
  40 
  41 import java.lang.reflect.Field;
  42 
  43 public class TestUnsafePutAddressNullObjMustNotEscape {
  44 
  45     public static Unsafe usafe;
  46     public static long mem;
  47     public static long checksum;
  48 
  49     public static void main(String[] args) throws Exception {
  50         System.out.println("EXECUTING test.");
  51 
  52         {
  53             System.out.println("Acquiring jdk.internal.misc.Unsafe.theUnsafe using reflection.");
  54             getUnsafe();
  55             System.out.println("Allocating raw memory.");
  56             mem = (usafe.allocateMemory(1024) + 8L) & ~7L;
  57             System.out.println("Triggering JIT compilation of the test method");
  58             triggerJitCompilationOfTestMethod();
  59         }
  60 
  61         System.out.println("SUCCESSFULLY passed test.");
  62     }
  63 
  64     public static void triggerJitCompilationOfTestMethod() {
  65         long sum = 0;
  66         for (int ii = 50000; ii >= 0; ii--) {
  67             sum = testMethod();
  68         }
  69         checksum = sum;
  70     }
  71 
  72     public static class IDGen {
  73         private static long id;
  74         public long nextId() {
  75             return id++;
  76         }
  77     }
  78 
  79     public static long testMethod() {
  80         // dummy alloc to trigger escape analysis
  81         IDGen gen = new IDGen();
  82         // StoreP of null_obj to raw mem triggers assertion in escape analysis
  83         usafe.putAddress(mem, 0L);
  84         return gen.nextId();
  85     }
  86 
  87     private static void getUnsafe() throws Exception {
  88         Field field = jdk.internal.misc.Unsafe.class.getDeclaredField("theUnsafe");
  89         field.setAccessible(true);
  90         usafe = (jdk.internal.misc.Unsafe) field.get(null);
  91     }
  92 }