1 /*
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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
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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.
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23 
24 /**
25  * @test
26  * @bug 8058828
27  * @modules java.base/jdk.internal.org.objectweb.asm
28  *          java.base/jdk.internal.misc
29  *
30  * @run main/bootclasspath/othervm -Xbatch compiler.jsr292.VMAnonymousClasses
31  */
32 
33 package compiler.jsr292;
34 
35 import jdk.internal.misc.Unsafe;
36 import jdk.internal.org.objectweb.asm.ClassWriter;
37 import jdk.internal.org.objectweb.asm.MethodVisitor;
38 import jdk.internal.org.objectweb.asm.Opcodes;
39 
40 import java.lang.invoke.ConstantCallSite;
41 import java.lang.invoke.MethodHandle;
42 import java.lang.invoke.MethodHandles;
43 import java.lang.invoke.MethodType;
44 import java.lang.invoke.MutableCallSite;
45 import java.lang.invoke.VolatileCallSite;
46 
47 public class VMAnonymousClasses {
48     static final String TEST_METHOD_NAME = "constant";
49 
50     static final Unsafe UNSAFE = Unsafe.getUnsafe();
51 
getConstantPoolSize(byte[] classFile)52     static int getConstantPoolSize(byte[] classFile) {
53         // The first few bytes:
54         // u4 magic;
55         // u2 minor_version;
56         // u2 major_version;
57         // u2 constant_pool_count;
58         return ((classFile[8] & 0xFF) << 8) | (classFile[9] & 0xFF);
59     }
60 
test(Object value)61     static void test(Object value) throws ReflectiveOperationException {
62         System.out.printf("Test: %s", value != null ? value.getClass() : "null");
63 
64         ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS | ClassWriter.COMPUTE_FRAMES);
65         cw.visit(Opcodes.V1_8, Opcodes.ACC_PUBLIC | Opcodes.ACC_SUPER, "Test", null, "java/lang/Object", null);
66 
67         MethodVisitor mv = cw.visitMethod(Opcodes.ACC_STATIC | Opcodes.ACC_PUBLIC, TEST_METHOD_NAME, "()Ljava/lang/Object;", null, null);
68 
69         String placeholder = "CONSTANT";
70         int index = cw.newConst(placeholder);
71         mv.visitLdcInsn(placeholder);
72         mv.visitInsn(Opcodes.ARETURN);
73 
74         mv.visitMaxs(0, 0);
75         mv.visitEnd();
76 
77         byte[] classFile = cw.toByteArray();
78 
79         Object[] cpPatches = new Object[getConstantPoolSize(classFile)];
80         cpPatches[index] = value;
81 
82         Class<?> test = UNSAFE.defineAnonymousClass(VMAnonymousClasses.class, classFile, cpPatches);
83 
84         Object expectedResult = (value != null) ? value : placeholder;
85         for (int i = 0; i<15000; i++) {
86             Object result = test.getMethod(TEST_METHOD_NAME).invoke(null);
87             if (result != expectedResult) {
88                 throw new AssertionError(String.format("Wrong value returned: %s != %s", value, result));
89             }
90         }
91         System.out.println(" PASSED");
92     }
93 
main(String[] args)94     public static void main(String[] args) throws ReflectiveOperationException  {
95         // Objects
96         test(new Object());
97         test("TEST");
98         test(new VMAnonymousClasses());
99         test(null);
100 
101         // Class
102         test(String.class);
103 
104         // Arrays
105         test(new boolean[0]);
106         test(new byte[0]);
107         test(new char[0]);
108         test(new short[0]);
109         test(new int[0]);
110         test(new long[0]);
111         test(new float[0]);
112         test(new double[0]);
113         test(new Object[0]);
114 
115         // Multi-dimensional arrays
116         test(new byte[0][0]);
117         test(new Object[0][0]);
118 
119         // MethodHandle-related
120         MethodType   mt = MethodType.methodType(void.class, String[].class);
121         MethodHandle mh = MethodHandles.lookup().findStatic(VMAnonymousClasses.class, "main", mt);
122         test(mt);
123         test(mh);
124         test(new ConstantCallSite(mh));
125         test(new MutableCallSite(MethodType.methodType(void.class)));
126         test(new VolatileCallSite(MethodType.methodType(void.class)));
127 
128         System.out.println("TEST PASSED");
129     }
130 }
131