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23 
24 
25 /**
26  * @test
27 
28  * @bug 6490436
29  * @summary Verify that protected constructor calls are not allowed for any classfile versions in either verifier.
30  * @author Keith McGuigan
31  */
32 
33 public class VerifyProtectedConstructor extends ClassLoader {
main(String argv[])34   public static void main(String argv[]) throws Exception {
35     VerifyProtectedConstructor t = new VerifyProtectedConstructor();
36 
37     t.loadSuperClass();
38 
39     try {
40       t.checkClassVersion(49); // should not throw VerifyError
41       throw new Exception("FAIL: should be a VerifyError for CF version 49");
42     }
43     catch(VerifyError e) {
44        System.out.println("PASS for CF version 49");
45     }
46 
47     try {
48       t.checkClassVersion(50); // should throw VerifyError
49       throw new Exception("FAIL: should be a VerifyError for CF version 50");
50     }
51     catch(VerifyError e) {
52        System.out.println("PASS");
53     }
54   }
55 
loadSuperClass()56   private void loadSuperClass() {
57     /* -- code for super class A.A --
58        package A;
59        public class A {
60          protected A() {}
61        }
62     */
63     long[] cls_data = {
64       0xcafebabe00000032L, 0x000a0a0003000707L,
65       0x0008070009010006L, 0x3c696e69743e0100L,
66       0x0328295601000443L, 0x6f64650c00040005L,
67       0x010003412f410100L, 0x106a6176612f6c61L,
68       0x6e672f4f626a6563L, 0x7400210002000300L,
69       0x0000000001000400L, 0x0400050001000600L,
70       0x0000110001000100L, 0x0000052ab70001b1L,
71       0x0000000000000000L // 2 bytes extra
72     };
73     final int EXTRA = 2;
74     byte cf_bytes[] = toByteArray(cls_data);
75     defineClass("A.A", cf_bytes, 0, cf_bytes.length - EXTRA);
76   }
77 
78   private int num_calls;
79   private static String classNames[] = { "B.B", "C.C" };
80 
checkClassVersion(int version)81   private void checkClassVersion(int version) throws VerifyError {
82     // This class is in violation of the spec since it accesses
83     // a protected constructor of a superclass while not being in the
84     // same package.
85     /* -- code for test class --
86         package B;
87         public class B extends A.A {
88           public static void f() { new A.A(); }
89         }
90     */
91     long[] cls_data = {
92       0xcafebabe00000032L, 0x000b0a0002000807L,
93       0x000907000a010006L, 0x3c696e69743e0100L,
94       0x0328295601000443L, 0x6f6465010001660cL,
95       0x0004000501000341L, 0x2f41010003422f42L,
96       0x0021000300020000L, 0x0000000200010004L,
97       0x0005000100060000L, 0x0011000100010000L,
98       0x00052ab70001b100L, 0x0000000009000700L,
99       0x0500010006000000L, 0x1500020000000000L,
100       0x09bb000259b70001L, 0x57b1000000000000L // no extra bytes
101     };
102     final int EXTRA = 0;
103 
104     byte cf_bytes[] = toByteArray(cls_data);
105 
106     // set version
107     cf_bytes[7] = (byte)version;
108 
109     // Change B.B to C.C, D.D, ... for subsequent calls so we can call this
110     // multiple times and define different classes.
111     cf_bytes[61] += num_calls;
112     cf_bytes[63] += num_calls;
113     String name = classNames[num_calls];
114     num_calls++;
115 
116     Class c = defineClass(name, cf_bytes, 0, cf_bytes.length - EXTRA);
117 
118     try { c.newInstance(); } // to force linking, thus verification
119     catch(InstantiationException e) {}
120     catch(IllegalAccessException e) {}
121   }
122 
toByteArray(long arr[])123   static private byte[] toByteArray(long arr[]) {
124     // convert long array to byte array
125     java.nio.ByteBuffer bbuf = java.nio.ByteBuffer.allocate(arr.length * 8);
126     bbuf.asLongBuffer().put(java.nio.LongBuffer.wrap(arr));
127     return bbuf.array();
128   }
129 }
130