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23 
24 package vm.runtime.defmeth.shared;
25 
26 import vm.runtime.defmeth.shared.data.method.body.CallMethod;
27 import vm.runtime.defmeth.shared.executor.MHInvokeWithArgsTest;
28 
29 import java.lang.invoke.MethodHandle;
30 import java.lang.invoke.MethodHandles;
31 import java.lang.invoke.MethodType;
32 import java.lang.reflect.InvocationTargetException;
33 import java.lang.reflect.Method;
34 
35 /**
36  * Encapsulates test context and provides utility methods to invoke methods
37  * in that context through reflection. Should be loaded in the same class loader as all other test classes.
38  * It is needed for correct resolution of initiating class loader in case of reflection invocation scenario.
39  */
40 public class TestContext {
invoke(Method m, Object obj, Object... args)41     public static Object invoke(Method m, Object obj, Object... args)
42             throws InvocationTargetException, IllegalAccessException
43     {
44         return m.invoke(obj, args);
45     }
46 
invokeWithArguments(CallMethod.Invoke invokeType, Class<?> declaringClass, String methodName, MethodType type, Object... arguments)47     public static Object invokeWithArguments(CallMethod.Invoke invokeType, Class<?> declaringClass,
48                                              String methodName, MethodType type, Object... arguments) throws Throwable {
49         // Need to do method lookup in the right context
50         // Otherwise, ClassNotFoundException is thrown
51         MethodHandles.Lookup LOOKUP = MethodHandles.lookup();
52         MethodHandle mh;
53 
54         // FYI: can't use switch over enum here, because to implement it javac produces auxiliary class TestContext$1
55         // and it can't be accessed from the context where TestContext is loaded
56         if (invokeType == CallMethod.Invoke.VIRTUAL || invokeType == CallMethod.Invoke.INTERFACE) {
57             mh = LOOKUP.findVirtual(declaringClass, methodName, type);
58         } else if (invokeType == CallMethod.Invoke.SPECIAL) {
59             mh = LOOKUP.findSpecial(declaringClass, methodName, type, declaringClass);
60         } else if (invokeType == CallMethod.Invoke.STATIC) {
61             mh = LOOKUP.findStatic(declaringClass, methodName, type);
62         } else {
63             throw new Error("Unknown invoke instruction: "+invokeType);
64         }
65 
66         return mh.invokeWithArguments(arguments);
67     }
68 }
69 
70