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 package org.graalvm.compiler.replacements.test;
24
25 import java.util.Objects;
26
27 import org.junit.Assert;
28 import org.junit.Test;
29
30 import org.graalvm.compiler.api.directives.GraalDirectives;
31 import org.graalvm.compiler.core.test.GraalCompilerTest;
32 import org.graalvm.compiler.nodes.StructuredGraph;
33 import org.graalvm.compiler.nodes.ValueNode;
34 import org.graalvm.compiler.nodes.graphbuilderconf.GraphBuilderConfiguration.Plugins;
35 import org.graalvm.compiler.nodes.graphbuilderconf.GraphBuilderContext;
36 import org.graalvm.compiler.nodes.graphbuilderconf.InvocationPlugin;
37 import org.graalvm.compiler.nodes.graphbuilderconf.InvocationPlugins.Registration;
38 import org.graalvm.compiler.replacements.Snippets;
39 import org.graalvm.compiler.word.Word;
40 import org.graalvm.compiler.word.nodes.WordCastNode;
41
42 import jdk.vm.ci.meta.ResolvedJavaMethod;
43
44 /**
45 * Tests for derived oops in reference maps.
46 */
47 public class DerivedOopTest extends GraalCompilerTest implements Snippets {
48
49 private static class Pointers {
50 public long basePointer;
51 public long internalPointer;
52
53 public long delta() {
54 return internalPointer - basePointer;
55 }
56
57 @Override
58 public boolean equals(Object obj) {
59 if (!(obj instanceof Pointers)) {
60 return false;
61 }
62
63 Pointers other = (Pointers) obj;
64 return this.delta() == other.delta();
65 }
66
67 @Override
68 public int hashCode() {
69 return (int) delta();
70 }
71 }
72
73 private static class Result {
74 public Pointers beforeGC;
75 public Pointers afterGC;
76
77 Result() {
78 beforeGC = new Pointers();
79 afterGC = new Pointers();
80 }
81
82 @Override
83 public int hashCode() {
84 final int prime = 31;
85 int result = 1;
86 result = prime * result + ((afterGC == null) ? 0 : afterGC.hashCode());
87 result = prime * result + ((beforeGC == null) ? 0 : beforeGC.hashCode());
88 return result;
89 }
90
91 @Override
92 public boolean equals(Object obj) {
93 if (!(obj instanceof Result)) {
94 return false;
95 }
96 Result other = (Result) obj;
97 return Objects.equals(this.beforeGC, other.beforeGC) && Objects.equals(this.afterGC, other.afterGC);
98 }
99 }
100
101 @Test
102 public void testFieldOffset() {
103 // Run a couple times to encourage objects to move
104 for (int i = 0; i < 4; i++) {
105 Result r = new Result();
106 test("fieldOffsetSnippet", r, 16L);
107
108 Assert.assertEquals(r.beforeGC.delta(), r.afterGC.delta());
109 }
110 }
111
112 static long getRawPointer(Object obj) {
113 // fake implementation for interpreter
114 return obj.hashCode();
115 }
116
117 static long getRawPointerIntrinsic(Object obj) {
118 return Word.objectToTrackedPointer(obj).rawValue();
119 }
120
121 public static Result fieldOffsetSnippet(Result obj, long offset) {
122 long internalPointer = getRawPointer(obj) + offset;
123
124 // make sure the internal pointer is computed before the safepoint
125 GraalDirectives.blackhole(internalPointer);
126
127 obj.beforeGC.basePointer = getRawPointer(obj);
128 obj.beforeGC.internalPointer = internalPointer;
129
130 System.gc();
131
132 obj.afterGC.basePointer = getRawPointer(obj);
133 obj.afterGC.internalPointer = internalPointer;
134
135 return obj;
136 }
137
138 @Override
139 protected Plugins getDefaultGraphBuilderPlugins() {
140 Plugins plugins = super.getDefaultGraphBuilderPlugins();
141 Registration r = new Registration(plugins.getInvocationPlugins(), DerivedOopTest.class);
142
143 ResolvedJavaMethod intrinsic = getResolvedJavaMethod("getRawPointerIntrinsic");
144 r.register1("getRawPointer", Object.class, new InvocationPlugin() {
145 @Override
146 public boolean apply(GraphBuilderContext b, ResolvedJavaMethod targetMethod, Receiver receiver, ValueNode arg) {
147 return b.intrinsify(getReplacements().getReplacementBytecodeProvider(), targetMethod, intrinsic, receiver, new ValueNode[]{arg});
148 }
149 });
150
151 return plugins;
152 }
153
154 @Override
155 protected boolean checkHighTierGraph(StructuredGraph graph) {
156 assert graph.getNodes().filter(WordCastNode.class).count() > 0 : "DerivedOopTest.toLong should be intrinsified";
157 return super.checkHighTierGraph(graph);
158 }
159 }