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 package org.graalvm.compiler.core.test;
  24 
  25 import jdk.vm.ci.amd64.AMD64;
  26 import jdk.vm.ci.meta.ResolvedJavaMethod;
  27 
  28 import org.graalvm.compiler.core.common.CompilationIdentifier;
  29 import org.graalvm.compiler.nodes.ConstantNode;
  30 import org.graalvm.compiler.nodes.StructuredGraph;
  31 import org.graalvm.compiler.options.OptionValues;
  32 import org.junit.Assume;
  33 import org.junit.Test;
  34 
  35 public class StableArrayReadFoldingTest extends GraalCompilerTest {
  36 
  37     static final boolean[] STABLE_BOOLEAN_ARRAY = new boolean[16];
  38     static final int[] STABLE_INT_ARRAY = new int[16];
  39 
  40     static final long BOOLEAN_ARRAY_BASE_OFFSET;
  41     static final long INT_ARRAY_BASE_OFFSET;
  42 
  43     static {
  44         BOOLEAN_ARRAY_BASE_OFFSET = UNSAFE.arrayBaseOffset(boolean[].class);
  45         INT_ARRAY_BASE_OFFSET = UNSAFE.arrayBaseOffset(int[].class);
  46     }
  47 
  48     @Override
  49     protected StructuredGraph parseForCompile(ResolvedJavaMethod method, CompilationIdentifier compilationId, OptionValues options) {
  50         StructuredGraph graph = super.parseForCompile(method, compilationId, options);
  51         // Mimic @Stable array constants.
  52         for (ConstantNode constantNode : graph.getNodes().filter(ConstantNode.class).snapshot()) {
  53             if (getConstantReflection().readArrayLength(constantNode.asJavaConstant()) != null) {
  54                 ConstantNode newConstantNode = graph.unique(ConstantNode.forConstant(constantNode.asJavaConstant(), 1, true, getMetaAccess()));
  55                 constantNode.replaceAndDelete(newConstantNode);
  56             }
  57         }
  58         return graph;
  59     }
  60 
  61     public static boolean killWithSameType() {
  62         boolean beforeKill = UNSAFE.getBoolean(STABLE_BOOLEAN_ARRAY, BOOLEAN_ARRAY_BASE_OFFSET);
  63         STABLE_BOOLEAN_ARRAY[0] = true;
  64         boolean afterKill = UNSAFE.getBoolean(STABLE_BOOLEAN_ARRAY, BOOLEAN_ARRAY_BASE_OFFSET);
  65 
  66         STABLE_BOOLEAN_ARRAY[0] = false;
  67         return beforeKill == afterKill;
  68     }
  69 
  70     @Test
  71     public void testKillWithSameType() {
  72         ResolvedJavaMethod method = getResolvedJavaMethod("killWithSameType");
  73         testAgainstExpected(method, new Result(true, null), null);
  74     }
  75 
  76     public static boolean killWithDifferentType() {
  77         byte beforeKill = UNSAFE.getByte(STABLE_BOOLEAN_ARRAY, BOOLEAN_ARRAY_BASE_OFFSET);
  78         STABLE_BOOLEAN_ARRAY[0] = true;
  79         byte afterKill = UNSAFE.getByte(STABLE_BOOLEAN_ARRAY, BOOLEAN_ARRAY_BASE_OFFSET);
  80 
  81         STABLE_BOOLEAN_ARRAY[0] = false;
  82         return beforeKill == afterKill;
  83     }
  84 
  85     @Test
  86     public void testKillWithDifferentType() {
  87         ResolvedJavaMethod method = getResolvedJavaMethod("killWithDifferentType");
  88         testAgainstExpected(method, new Result(true, null), null);
  89     }
  90 
  91     public static boolean killWithSameTypeUnaligned() {
  92         int beforeKill = UNSAFE.getInt(STABLE_INT_ARRAY, INT_ARRAY_BASE_OFFSET + 1);
  93         STABLE_INT_ARRAY[0] = 0x01020304;
  94         int afterKill = UNSAFE.getInt(STABLE_INT_ARRAY, INT_ARRAY_BASE_OFFSET + 1);
  95 
  96         STABLE_INT_ARRAY[0] = 0;
  97         return beforeKill == afterKill;
  98     }
  99 
 100     @Test
 101     public void testKillWithSameTypeUnaligned() {
 102         Assume.assumeTrue("Only test unaligned access on AMD64", getTarget().arch instanceof AMD64);
 103         ResolvedJavaMethod method = getResolvedJavaMethod("killWithSameTypeUnaligned");
 104         testAgainstExpected(method, new Result(true, null), null);
 105     }
 106 
 107     public static boolean killWithDifferentTypeUnaligned() {
 108         byte beforeKill = UNSAFE.getByte(STABLE_INT_ARRAY, INT_ARRAY_BASE_OFFSET + 1);
 109         STABLE_INT_ARRAY[0] = 0x01020304;
 110         byte afterKill = UNSAFE.getByte(STABLE_INT_ARRAY, INT_ARRAY_BASE_OFFSET + 1);
 111 
 112         STABLE_INT_ARRAY[0] = 0;
 113         return beforeKill == afterKill;
 114     }
 115 
 116     @Test
 117     public void testKillWithDifferentTypeUnaligned() {
 118         Assume.assumeTrue("Only test unaligned access on AMD64", getTarget().arch instanceof AMD64);
 119         ResolvedJavaMethod method = getResolvedJavaMethod("killWithDifferentTypeUnaligned");
 120         testAgainstExpected(method, new Result(true, null), null);
 121     }
 122 }