1 /*
   2  * Copyright (c) 2015, 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  * @bug 8136421
  27  * @requires (os.simpleArch == "x64" | os.simpleArch == "sparcv9") & os.arch != "aarch64"
  28  * @library / /testlibrary /../../test/lib/
  29  * @compile ../common/CompilerToVMHelper.java
  30  * @build compiler.jvmci.compilerToVM.ReadUncompressedOopTest
  31  * @run main ClassFileInstaller
  32  *     sun.hotspot.WhiteBox
  33  *     sun.hotspot.WhiteBox$WhiteBoxPermission
  34  *     jdk.vm.ci.hotspot.CompilerToVMHelper
  35  * @run main/othervm -Xbootclasspath/a:.
  36  *     -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI
  37  *     -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI
  38  *     -XX:-UseCompressedOops
  39  *     compiler.jvmci.compilerToVM.ReadUncompressedOopTest
  40  * @run main/othervm -Xbootclasspath/a:.
  41  *     -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI
  42  *     -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI
  43  *     -XX:+UseCompressedOops
  44  *     compiler.jvmci.compilerToVM.ReadUncompressedOopTest
  45  */
  46 
  47 package compiler.jvmci.compilerToVM;
  48 
  49 import jdk.vm.ci.hotspot.CompilerToVMHelper;
  50 import jdk.test.lib.Asserts;
  51 import jdk.test.lib.Utils;
  52 import sun.hotspot.WhiteBox;
  53 import sun.misc.Unsafe;
  54 
  55 import java.lang.reflect.Field;
  56 
  57 public class ReadUncompressedOopTest {
  58 
  59     public static void main(String args[])  {
  60         new ReadUncompressedOopTest().runTest();
  61     }
  62 
  63     private void runTest()  {
  64         long ptr = getPtr();
  65         System.out.printf("calling readUncompressedOop(0x%x)%n", ptr);
  66         Asserts.assertEQ(getClass(),
  67                 CompilerToVMHelper.readUncompressedOop(ptr),
  68                 String.format("unexpected class returned for 0x%x", ptr));
  69     }
  70 
  71     private static final Unsafe UNSAFE = Utils.getUnsafe();
  72     private static final WhiteBox WB = WhiteBox.getWhiteBox();
  73     private static final Class<?> CLASS = ReadUncompressedOopTest.class;
  74     private static final long PTR = WB.getObjectAddress(CLASS);
  75     
  76     private static long getPtr() {
  77         Field field;
  78         try {
  79             field = CLASS.getDeclaredField("PTR");
  80         } catch (NoSuchFieldException nsfe) {
  81             throw new Error("TESTBUG : " + nsfe, nsfe);
  82         }
  83         Object base = UNSAFE.staticFieldBase(field);
  84         return WB.getObjectAddress(base) + UNSAFE.staticFieldOffset(field);
  85     }
  86 }
  87