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
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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.util.ArrayList;
28 import java.util.List;
29 
30 import org.junit.Test;
31 import org.junit.runner.RunWith;
32 import org.junit.runners.Parameterized;
33 import org.junit.runners.Parameterized.Parameters;
34 import org.objectweb.asm.ClassWriter;
35 import org.objectweb.asm.FieldVisitor;
36 import org.objectweb.asm.MethodVisitor;
37 
38 import jdk.vm.ci.meta.JavaKind;
39 import jdk.vm.ci.meta.ResolvedJavaMethod;
40 
41 @RunWith(Parameterized.class)
42 public class SubWordReturnTest extends CustomizedBytecodePatternTest {
43 
44     private final JavaKind kind;
45     private final int value;
46 
47     @Parameters(name = "{0}, {1}")
data()48     public static List<Object[]> data() {
49         ArrayList<Object[]> ret = new ArrayList<>();
50         for (int i : new int[]{1000000, 1000001, -1000000, -1}) {
51             ret.add(new Object[]{JavaKind.Boolean, i});
52             ret.add(new Object[]{JavaKind.Byte, i});
53             ret.add(new Object[]{JavaKind.Short, i});
54             ret.add(new Object[]{JavaKind.Char, i});
55         }
56         return ret;
57     }
58 
SubWordReturnTest(JavaKind kind, int value)59     public SubWordReturnTest(JavaKind kind, int value) {
60         this.kind = kind;
61         this.value = value;
62     }
63 
64     @Test
testSubWordReturn()65     public void testSubWordReturn() throws ClassNotFoundException {
66         Class<?> testClass = getClass(SubWordReturnTest.class.getName() + "$" + kind.toString() + "Getter");
67         ResolvedJavaMethod method = getResolvedJavaMethod(testClass, "testSnippet");
68         test(method, null);
69     }
70 
71     /**
72      * {@link #generateClass} generates a class looking like this for the types boolean, byte,
73      * short, and char.
74      */
75     static class ByteGetter {
76 
77         // private static int intField = 1000000;
78 
get()79         private static byte get() {
80             // GETSTATIC intField
81             // IRETURN
82             return 0;
83         }
84 
testByteSnippet()85         public static int testByteSnippet() {
86             return get();
87         }
88     }
89 
90     @Override
generateClass(String internalClassName)91     protected byte[] generateClass(String internalClassName) {
92         ClassWriter cw = new ClassWriter(0);
93         cw.visit(52, ACC_SUPER | ACC_PUBLIC, internalClassName, null, "java/lang/Object", null);
94 
95         FieldVisitor intField = cw.visitField(ACC_PRIVATE | ACC_STATIC, "intField", "I", null, value);
96         intField.visitEnd();
97 
98         MethodVisitor get = cw.visitMethod(ACC_PRIVATE | ACC_STATIC, "get", "()" + kind.getTypeChar(), null, null);
99         get.visitCode();
100         get.visitFieldInsn(GETSTATIC, internalClassName, "intField", "I");
101         get.visitInsn(IRETURN);
102         get.visitMaxs(1, 0);
103         get.visitEnd();
104 
105         MethodVisitor snippet = cw.visitMethod(ACC_PUBLIC | ACC_STATIC, "testSnippet", "()I", null, null);
106         snippet.visitCode();
107         snippet.visitMethodInsn(INVOKESTATIC, internalClassName, "get", "()" + kind.getTypeChar(), false);
108         snippet.visitInsn(IRETURN);
109         snippet.visitMaxs(1, 0);
110         snippet.visitEnd();
111 
112         cw.visitEnd();
113         return cw.toByteArray();
114     }
115 
116 }
117