1 files changed, 136 insertions, 0 deletions
diff --git a/test/956-methodhandles/src/Main.java b/test/956-methodhandles/src/Main.java
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+++ b/test/956-methodhandles/src/Main.java
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+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.lang.invoke.MethodHandles.Lookup;
+import java.lang.invoke.MethodType;
+import java.lang.invoke.WrongMethodTypeException;
+
+public class Main {
+
+  public static class A {
+    public void foo() {
+      System.out.println("foo_A");
+    }
+
+    public static final Lookup lookup = MethodHandles.lookup();
+  }
+
+  public static class B extends A {
+    public void foo() {
+      System.out.println("foo_B");
+    }
+
+    public static final Lookup lookup = MethodHandles.lookup();
+  }
+
+  public static class C extends B {
+    public static final Lookup lookup = MethodHandles.lookup();
+  }
+
+  public static class D {
+    private final void privateRyan() {
+      System.out.println("privateRyan_D");
+    }
+
+    public static final Lookup lookup = MethodHandles.lookup();
+  }
+
+  public static class E extends D {
+    public static final Lookup lookup = MethodHandles.lookup();
+  }
+
+  public static void main(String[] args) throws Throwable {
+    testfindSpecial_invokeSuperBehaviour();
+    testfindSpecial_invokeDirectBehaviour();
+  }
+
+  public static void testfindSpecial_invokeSuperBehaviour() throws Throwable {
+    // This is equivalent to an invoke-super instruction where the referrer
+    // is B.class.
+    MethodHandle mh1 = B.lookup.findSpecial(A.class /* refC */, "foo",
+        MethodType.methodType(void.class), B.class /* specialCaller */);
+
+    A aInstance = new A();
+    B bInstance = new B();
+    C cInstance = new C();
+
+    // This should be as if an invoke-super was called from one of B's methods.
+    mh1.invokeExact(bInstance);
+    mh1.invoke(bInstance);
+
+    // This should not work. The receiver type in the handle will be suitably
+    // restricted to B and subclasses.
+    try {
+      mh1.invoke(aInstance);
+      System.out.println("mh1.invoke(aInstance) should not succeeed");
+    } catch (ClassCastException expected) {
+    }
+
+    try {
+      mh1.invokeExact(aInstance);
+      System.out.println("mh1.invoke(aInstance) should not succeeed");
+    } catch (WrongMethodTypeException expected) {
+    } catch (ClassCastException workaround) {
+      // TODO(narayan): ART treats all invokes as if they were non-exact. We
+      // should throw a WMTE if we execute an invoke-polymorphic instruction whose
+      // target method is MethodHandle.invokeExact.
+    }
+
+    // This should *still* be as if an invoke-super was called from one of C's
+    // methods, despite the fact that we're operating on a C.
+    mh1.invoke(cInstance);
+
+    // Now that C is the special caller, the next invoke will call B.foo.
+    MethodHandle mh2 = C.lookup.findSpecial(A.class /* refC */, "foo",
+        MethodType.methodType(void.class), C.class /* specialCaller */);
+    mh2.invokeExact(cInstance);
+
+    // Shouldn't allow invoke-super semantics from an unrelated special caller.
+    try {
+      C.lookup.findSpecial(A.class, "foo",
+        MethodType.methodType(void.class), D.class /* specialCaller */);
+      System.out.println("findSpecial(A.class, foo, .. D.class) unexpectedly succeeded.");
+    } catch (IllegalAccessException expected) {
+    }
+  }
+
+  public static void testfindSpecial_invokeDirectBehaviour() throws Throwable {
+    D dInstance = new D();
+
+    MethodHandle mh3 = D.lookup.findSpecial(D.class, "privateRyan",
+        MethodType.methodType(void.class), D.class /* specialCaller */);
+    mh3.invoke(dInstance);
+
+    // The private method shouldn't be accessible from any special caller except
+    // itself...
+    try {
+      D.lookup.findSpecial(D.class, "privateRyan", MethodType.methodType(void.class), C.class);
+      System.out.println("findSpecial(privateRyan, C.class) unexpectedly succeeded");
+    } catch (IllegalAccessException expected) {
+    }
+
+    // ... or from any lookup context except its own.
+    try {
+      E.lookup.findSpecial(D.class, "privateRyan", MethodType.methodType(void.class), E.class);
+      System.out.println("findSpecial(privateRyan, E.class) unexpectedly succeeded");
+    } catch (IllegalAccessException expected) {
+    }
+  }
+}
+
+