return false;
}
} else if (handle_kind == kInvokeDirect) {
- // TODO(narayan) : We need to handle the case where the target method is a
- // constructor here. Also the case where we don't want to dynamically
- // dispatch based on the type of the receiver.
- UNIMPLEMENTED(FATAL) << "Direct invokes are not implemented yet.";
- return false;
+ if (called_method->IsConstructor()) {
+ // TODO(narayan) : We need to handle the case where the target method is a
+ // constructor here.
+ UNIMPLEMENTED(FATAL) << "Direct invokes for constructors are not implemented yet.";
+ return false;
+ }
+
+ // Nothing special to do in the case where we're not dealing with a
+ // constructor. It's a private method, and we've already access checked at
+ // the point of creating the handle.
+ } else if (handle_kind == kInvokeSuper) {
+ mirror::Class* declaring_class = called_method->GetDeclaringClass();
+
+ // Note that we're not dynamically dispatching on the type of the receiver
+ // here. We use the static type of the "receiver" object that we've
+ // recorded in the method handle's type, which will be the same as the
+ // special caller that was specified at the point of lookup.
+ mirror::Class* referrer_class = handle_type->GetPTypes()->Get(0);
+ if (!declaring_class->IsInterface()) {
+ mirror::Class* super_class = referrer_class->GetSuperClass();
+ uint16_t vtable_index = called_method->GetMethodIndex();
+ DCHECK(super_class != nullptr);
+ DCHECK(super_class->HasVTable());
+ // Note that super_class is a super of referrer_class and called_method
+ // will always be declared by super_class (or one of its super classes).
+ DCHECK_LT(vtable_index, super_class->GetVTableLength());
+ called_method = super_class->GetVTableEntry(vtable_index, kRuntimePointerSize);
+ } else {
+ called_method = referrer_class->FindVirtualMethodForInterfaceSuper(
+ called_method, kRuntimePointerSize);
+ }
+
+ CHECK(called_method != nullptr);
}
// NOTE: handle_kind == kInvokeStatic needs no special treatment here. We
--- /dev/null
+#!/bin/bash
+#
+# Copyright 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.
+
+# make us exit on a failure
+set -e
+
+if [[ $@ != *"--jvm"* ]]; then
+ # Don't do anything with jvm.
+ export USE_JACK=true
+ export JACK_SERVER=false
+ export JACK_REPOSITORY="${ANDROID_BUILD_TOP}/prebuilts/sdk/tools/jacks"
+ export JACK_VERSION=4.11.BETA
+fi
+
+./default-build "$@" --experimental method-handles
--- /dev/null
+/*
+ * 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) {
+ }
+ }
+}
+
+
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