1 /*
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3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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13  * accompanied this code).
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23 
24 /*
25  * @test
26  * @run testng VarHandleTestReflection
27  */
28 
29 import org.testng.annotations.DataProvider;
30 import org.testng.annotations.Test;
31 
32 import java.lang.invoke.MethodHandle;
33 import java.lang.invoke.MethodHandleInfo;
34 import java.lang.invoke.MethodHandles;
35 import java.lang.invoke.VarHandle;
36 import java.lang.reflect.Method;
37 import java.util.stream.Stream;
38 
39 public class VarHandleTestReflection extends VarHandleBaseTest {
40     String string;
41 
42     @DataProvider
accessModesProvider()43     public static Object[][] accessModesProvider() {
44         return Stream.of(VarHandle.AccessMode.values()).
45                 map(am -> new Object[]{am}).
46                 toArray(Object[][]::new);
47     }
48 
handle()49     static VarHandle handle() throws Exception {
50         return MethodHandles.lookup().
51                 findVarHandle(VarHandleTestReflection.class, "string", String.class);
52     }
53 
54     @Test(dataProvider = "accessModesProvider", expectedExceptions = IllegalArgumentException.class)
methodInvocation(VarHandle.AccessMode accessMode)55     public void methodInvocation(VarHandle.AccessMode accessMode) throws Exception {
56         VarHandle v = handle();
57 
58         // Try a reflective invoke using a Method
59 
60         Method vhm = VarHandle.class.getMethod(accessMode.methodName(), Object[].class);
61         vhm.invoke(v, new Object[]{});
62     }
63 
64     @Test(dataProvider = "accessModesProvider", expectedExceptions = UnsupportedOperationException.class)
methodHandleInvoke(VarHandle.AccessMode accessMode)65     public void methodHandleInvoke(VarHandle.AccessMode accessMode) throws Throwable {
66         VarHandle v = handle();
67 
68         // Try a reflective invoke using a MethodHandle
69 
70         MethodHandle mh = MethodHandles.lookup().unreflect(
71                 VarHandle.class.getMethod(accessMode.methodName(), Object[].class));
72         // Use invoke to avoid WrongMethodTypeException for
73         // non-signature-polymorphic return types
74         Object o = (Object) mh.invoke(v, new Object[]{});
75     }
76 
77     @Test(dataProvider = "accessModesProvider", expectedExceptions = IllegalArgumentException.class)
methodInvocationFromMethodInfo(VarHandle.AccessMode accessMode)78     public void methodInvocationFromMethodInfo(VarHandle.AccessMode accessMode) throws Exception {
79         VarHandle v = handle();
80 
81         // Try a reflective invoke using a Method obtained from cracking
82         // a MethodHandle
83 
84         MethodHandle mh = MethodHandles.lookup().unreflect(
85                 VarHandle.class.getMethod(accessMode.methodName(), Object[].class));
86         MethodHandleInfo info = MethodHandles.lookup().revealDirect(mh);
87         Method im = info.reflectAs(Method.class, MethodHandles.lookup());
88         im.invoke(v, new Object[]{});
89     }
90 
91     @Test(dataProvider = "accessModesProvider", expectedExceptions = IllegalArgumentException.class)
reflectAsFromVarHandleInvoker(VarHandle.AccessMode accessMode)92     public void reflectAsFromVarHandleInvoker(VarHandle.AccessMode accessMode) throws Exception {
93         VarHandle v = handle();
94 
95         MethodHandle mh = MethodHandles.varHandleInvoker(
96                 accessMode, v.accessModeType(accessMode));
97 
98         MethodHandleInfo info = MethodHandles.lookup().revealDirect(mh);
99 
100         info.reflectAs(Method.class, MethodHandles.lookup());
101     }
102 
103     @Test(dataProvider = "accessModesProvider", expectedExceptions = IllegalArgumentException.class)
reflectAsFromFindVirtual(VarHandle.AccessMode accessMode)104     public void reflectAsFromFindVirtual(VarHandle.AccessMode accessMode) throws Exception {
105         VarHandle v = handle();
106 
107         MethodHandle mh = MethodHandles.publicLookup().findVirtual(
108                 VarHandle.class, accessMode.methodName(), v.accessModeType(accessMode));
109 
110         MethodHandleInfo info = MethodHandles.lookup().revealDirect(mh);
111 
112         info.reflectAs(Method.class, MethodHandles.lookup());
113     }
114 }
115