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23 
24 /*
25  * @test
26  * @bug 8046171
27  * @summary Test access to private static fields between nestmates and nest-host
28  *          using different flavours of named nested types using MethodHandles
29  * @run main TestMethodHandles
30  */
31 
32 import java.lang.invoke.*;
33 import static java.lang.invoke.MethodHandles.*;
34 
35 import java.lang.reflect.Field;
36 
37 public class TestMethodHandles {
38 
39     // private static field of nest-host for nestmates to access
40     private static int priv_field;
41 
42     // public constructor so we aren't relying on private access
TestMethodHandles()43     public TestMethodHandles() {}
44 
45     // Methods that will access private static fields of nestmates
46 
47     // NOTE: No InnerNested calls in this test because non-static nested types
48     // can't have static fields. Also no StaticIface calls as static interface
49     // fields must be public (and final)
50 
access_priv(TestMethodHandles o)51     void access_priv(TestMethodHandles o) throws Throwable {
52         MethodHandle mh = lookup().findStaticGetter(o.getClass(), "priv_field", int.class);
53         priv_field = (int) mh.invoke();
54         priv_field = (int) mh.invokeExact();
55         mh = lookup().findStaticSetter(o.getClass(), "priv_field", int.class);
56         mh.invoke(2);
57         mh.invokeExact(3);
58     }
access_priv(StaticNested o)59     void access_priv(StaticNested o) throws Throwable {
60         MethodHandle mh = lookup().findStaticGetter(o.getClass(), "priv_field", int.class);
61         priv_field = (int) mh.invoke();
62         priv_field = (int) mh.invokeExact();
63         mh = lookup().findStaticSetter(o.getClass(), "priv_field", int.class);
64         mh.invoke(2);
65         mh.invokeExact(3);
66     }
67 
68     // The various nestmates
69 
70     static interface StaticIface {
71 
72         // Methods that will access private static fields of nestmates
73 
access_priv(TestMethodHandles o)74         default void access_priv(TestMethodHandles o) throws Throwable {
75             MethodHandle mh = lookup().findStaticGetter(o.getClass(), "priv_field", int.class);
76             int priv_field = (int) mh.invoke();
77             priv_field = (int) mh.invokeExact();
78             mh = lookup().findStaticSetter(o.getClass(), "priv_field", int.class);
79             mh.invoke(2);
80             mh.invokeExact(3);
81         }
access_priv(StaticNested o)82         default void access_priv(StaticNested o) throws Throwable {
83             MethodHandle mh = lookup().findStaticGetter(o.getClass(), "priv_field", int.class);
84             int priv_field = (int) mh.invoke();
85             priv_field = (int) mh.invokeExact();
86             mh = lookup().findStaticSetter(o.getClass(), "priv_field", int.class);
87             mh.invoke(2);
88             mh.invokeExact(3);
89         }
90     }
91 
92     static class StaticNested {
93 
94         private static int priv_field;
95 
96         // public constructor so we aren't relying on private access
StaticNested()97         public StaticNested() {}
98 
99         // Methods that will access private static fields of nestmates
100 
access_priv(TestMethodHandles o)101         void access_priv(TestMethodHandles o) throws Throwable {
102             MethodHandle mh = lookup().findStaticGetter(o.getClass(), "priv_field", int.class);
103             priv_field = (int) mh.invoke();
104             priv_field = (int) mh.invokeExact();
105             mh = lookup().findStaticSetter(o.getClass(), "priv_field", int.class);
106             mh.invoke(2);
107             mh.invokeExact(3);
108         }
access_priv(StaticNested o)109         void access_priv(StaticNested o) throws Throwable {
110             MethodHandle mh = lookup().findStaticGetter(o.getClass(), "priv_field", int.class);
111             priv_field = (int) mh.invoke();
112             priv_field = (int) mh.invokeExact();
113             mh = lookup().findStaticSetter(o.getClass(), "priv_field", int.class);
114             mh.invoke(2);
115             mh.invokeExact(3);
116         }
117     }
118 
119     class InnerNested {
120 
121         // public constructor so we aren't relying on private access
InnerNested()122         public InnerNested() {}
123 
access_priv(TestMethodHandles o)124         void access_priv(TestMethodHandles o) throws Throwable {
125             MethodHandle mh = lookup().findStaticGetter(o.getClass(), "priv_field", int.class);
126             priv_field = (int) mh.invoke();
127             priv_field = (int) mh.invokeExact();
128             mh = lookup().findStaticSetter(o.getClass(), "priv_field", int.class);
129             mh.invoke(2);
130             mh.invokeExact(3);
131         }
access_priv(StaticNested o)132         void access_priv(StaticNested o) throws Throwable {
133             MethodHandle mh = lookup().findStaticGetter(o.getClass(), "priv_field", int.class);
134             priv_field = (int) mh.invoke();
135             priv_field = (int) mh.invokeExact();
136             mh = lookup().findStaticSetter(o.getClass(), "priv_field", int.class);
137             mh.invoke(2);
138             mh.invokeExact(3);
139         }
140     }
141 
main(String[] args)142     public static void main(String[] args) throws Throwable {
143         TestMethodHandles o = new TestMethodHandles();
144         StaticNested s = new StaticNested();
145         InnerNested i = o.new InnerNested();
146         StaticIface intf = new StaticIface() {};
147 
148         o.access_priv(new TestMethodHandles());
149         o.access_priv(s);
150 
151         s.access_priv(o);
152         s.access_priv(new StaticNested());
153 
154         i.access_priv(o);
155         i.access_priv(s);
156 
157         intf.access_priv(o);
158         intf.access_priv(s);
159     }
160 }
161