1 /* 2 * Copyright (c) 2017, 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 package org.graalvm.compiler.core.test; 26 27 import java.lang.reflect.Field; 28 29 import org.graalvm.compiler.nodes.NamedLocationIdentity; 30 import org.graalvm.compiler.nodes.memory.ReadNode; 31 import org.junit.Assert; 32 import org.junit.Test; 33 34 import jdk.vm.ci.meta.JavaKind; 35 import sun.misc.Unsafe; 36 37 /** 38 * Tests that off-heap memory writes don't prevent optimization of on-heap accesses. 39 */ 40 public class OffHeapUnsafeAccessTest extends GraalCompilerTest { 41 42 static final Unsafe UNSAFE = initUnsafe(); 43 44 private static Unsafe initUnsafe() { 45 try { 46 // Fast path when we are trusted. 47 return Unsafe.getUnsafe(); 48 } catch (SecurityException se) { 49 // Slow path when we are not trusted. 50 try { 51 Field theUnsafe = Unsafe.class.getDeclaredField("theUnsafe"); 52 theUnsafe.setAccessible(true); 53 return (Unsafe) theUnsafe.get(Unsafe.class); 54 } catch (Exception e) { 55 throw new RuntimeException("exception while trying to get Unsafe", e); 56 } 57 } 58 } 59 60 public byte unboxByteAndStore(long memory, byte[] box) { 61 byte val = box[0]; 62 UNSAFE.putByte(memory, val); 63 UNSAFE.putByte(null, memory, val); 64 return box[0]; 65 } 66 67 public char unboxCharAndStore(long memory, char[] box) { 68 char val = box[0]; 69 UNSAFE.putChar(memory, val); 70 UNSAFE.putChar(null, memory, val); 71 return box[0]; 72 } 73 74 public int unboxIntAndStore(long memory, int[] box) { 75 int val = box[0]; 76 UNSAFE.putInt(memory, val); 77 UNSAFE.putInt(null, memory, val); 78 return box[0]; 79 } 80 81 public long unboxLongAndStore(long memory, long[] box) { 82 long val = box[0]; 83 UNSAFE.putLong(memory, val); 84 UNSAFE.putLong(null, memory, val); 85 UNSAFE.putAddress(memory, val); 86 return box[0]; 87 } 88 89 public float unboxFloatAndStore(long memory, float[] box) { 90 float val = box[0]; 91 UNSAFE.putFloat(memory, val); 92 UNSAFE.putFloat(null, memory, val); 93 return box[0]; 94 } 95 96 public double unboxDoubleAndStore(long memory, double[] box) { 97 double val = box[0]; 98 UNSAFE.putDouble(memory, val); 99 UNSAFE.putDouble(null, memory, val); 100 return box[0]; 101 } 102 103 private void assertExactlyOneArrayLoad(JavaKind elementKind) { 104 int total = 0; 105 for (ReadNode read : lastCompiledGraph.getNodes().filter(ReadNode.class)) { 106 if (read.getLocationIdentity().equals(NamedLocationIdentity.getArrayLocation(elementKind))) { 107 total++; 108 } 109 } 110 Assert.assertEquals(1, total); 111 } 112 113 @Test 114 public void testGet() { 115 long buf = allocBuf(); 116 if (buf != 0) { 117 try { 118 test("unboxByteAndStore", buf, new byte[]{40}); 119 assertExactlyOneArrayLoad(JavaKind.Byte); 120 121 test("unboxCharAndStore", buf, new char[]{41}); 122 assertExactlyOneArrayLoad(JavaKind.Char); 123 124 test("unboxIntAndStore", buf, new int[]{42}); 125 assertExactlyOneArrayLoad(JavaKind.Int); 126 127 test("unboxLongAndStore", buf, new long[]{43}); 128 assertExactlyOneArrayLoad(JavaKind.Long); 129 130 test("unboxFloatAndStore", buf, new float[]{44.0F}); 131 assertExactlyOneArrayLoad(JavaKind.Float); 132 133 test("unboxDoubleAndStore", buf, new double[]{45.0D}); 134 assertExactlyOneArrayLoad(JavaKind.Double); 135 } finally { 136 UNSAFE.freeMemory(buf); 137 } 138 } 139 } 140 141 protected long allocBuf() { 142 try { 143 return UNSAFE.allocateMemory(16); 144 } catch (OutOfMemoryError e) { 145 return 0L; 146 } 147 } 148 }