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/*
* Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package vm.runtime.defmeth;
import nsk.share.test.TestBase;
import vm.runtime.defmeth.shared.annotation.KnownFailure;
import vm.runtime.defmeth.shared.data.*;
import vm.runtime.defmeth.shared.data.method.param.*;
import static jdk.internal.org.objectweb.asm.Opcodes.*;
import vm.runtime.defmeth.shared.DefMethTest;
import vm.runtime.defmeth.shared.builder.TestBuilder;
import static vm.runtime.defmeth.shared.ExecutionMode.*;
/**
* Tests on method resolution in presence of default methods in the hierarchy.
*
* Because default methods reside in interfaces, and interfaces do not have
* the constraint of being single-inheritance, it is possible to inherit
* multiple conflicting default methods, or even inherit the same default method
* from many different inheritance paths.
*
* There is an algorithm to select which method to use in the case that a
* concrete class does not provide an implementation. Informally, the algorithm
* works as follows:
*
* (1) If there is a adequate implementation in the class itself or in a
* superclass (not an interface), then that implementation should be used
* (i.e., class methods always "win").
*
* (2) Failing that, create the set of methods consisting of all methods in the
* type hierarchy which satisfy the slot to be filled, where in this case
* 'satisfy' means that the methods have the same name, the same language-
* level representation of the parameters, and covariant return values. Both
* default methods and abstract methods will be part of this set.
*
* (3) Remove from this set, any method which has a "more specific" version
* anywhere in the hierarchy. That is, if C implements I,J and I extends J,
* then if both I and J have a suitable methods, J's method is eliminated
* from the set since I is a subtype of J -- there exist a more specific
* method than J's method, so that is eliminated.
*
* (4) If the remaining set contains only a single entry, then that method is
* selected. Note that the method may be abstract, in which case an
* IncompatibleClassChangeError is thrown when/if the method is called. If there are
* multiple entries in the set, or no entries, then this also results in an
* IncompatibleClassChangeError when called.
*/
public class MethodResolutionTest extends DefMethTest {
public static void main(String[] args) {
TestBase.runTest(new MethodResolutionTest(), args);
}
/*
* Basic
*
* interface I { int m(); }
* class C implements I { public int m() { return 1; } }
*
* TEST: C c = new C(); c.m() == 1;
* TEST: I i = new C(); i.m() == 1;
*/
public void testBasic() {
TestBuilder b = factory.getBuilder();
Interface I =
b.intf("I")
.abstractMethod("m", "()I").build()
.build();
ConcreteClass C =
b.clazz("C").implement(I)
.concreteMethod("m", "()I").returns(1).build()
.build();
b.test()
.callSite(I, C, "m", "()I")
.returns(1)
.done()
.test()
.callSite(C, C, "m", "()I")
.returns(1)
.done()
.run();
}
/*
* Basic Default
*
* interface I { int m() default { return 1; } }
* class C implements I {}
*
* TEST: C c = new C(); c.m() == 1;
* TEST: I i = new C(); i.m() == 1;
*/
public void testBasicDefault() {
TestBuilder b = factory.getBuilder();
Interface I =
b.intf("I")
.defaultMethod("m", "()I").returns(1)
.build()
.build();
ConcreteClass C =
b.clazz("C").implement(I)
.build();
b.test()
.callSite(I, C, "m", "()I")
.returns(1)
.done()
.test().callSite(C, C, "m", "()I")
.returns(1)
.done()
.run();
}
/*
* Far Default
*
* interface I { int m() default { return 1; } }
* interface J extends I {}
* interface K extends J {}
* class C implements K {}
*
* TEST: [I|J|K|C] i = new C(); i.m() == 1;
*/
@KnownFailure(modes = { INVOKE_EXACT, INVOKE_GENERIC, INVOKE_WITH_ARGS, INDY }) // Test2_J_C_m, Test3_K_C_m: AME => IAE => ICCE instead of successful call
public void testFarDefault() {
TestBuilder b = factory.getBuilder();
Interface I =
b.intf("I")
.defaultMethod("m", "()I").returns(1)
.build()
.build();
Interface J = b.intf("J").extend(I).build();
Interface K = b.intf("K").extend(J).build();
ConcreteClass C =
b.clazz("C").implement(K)
.build();
b.test()
.callSite(I, C, "m", "()I")
.returns(1)
.done()
.test().callSite(J, C, "m", "()I")
.returns(1)
.done()
.test().callSite(K, C, "m", "()I")
.returns(1)
.done()
.test().callSite(C, C, "m", "()I")
.returns(1)
.done()
.run();
}
/*
* Override Abstract
*
* interface I { int m(); }
* interface J extends I { int m() default { return 1; } }
* interface K extends J {}
* class C implements K {}
*
* TEST: C c = new C(); c.m() == 1;
* TEST: K k = new C(); k.m() == 1;
*/
@KnownFailure(modes = { INVOKE_EXACT, INVOKE_GENERIC, INVOKE_WITH_ARGS, INDY }) // Test3_K_C_m: AME => IAE => ICCE instead of successful call
public void testOverrideAbstract() {
TestBuilder b = factory.getBuilder();
Interface I = b.intf("I")
.abstractMethod("m", "()I").build()
.build();
Interface J = b.intf("J").extend(I)
.defaultMethod("m", "()I").returns(1).build()
.build();
Interface K = b.intf("K").extend(J).build();
ConcreteClass C = b.clazz("C").implement(K).build();
b.test()
.callSite(I, C, "m", "()I")
.returns(1)
.done()
.test()
.callSite(J, C, "m", "()I")
.returns(1)
.done()
.test()
.callSite(K, C, "m", "()I")
.returns(1)
.done()
.test()
.callSite(C, C, "m", "()I")
.returns(1)
.done()
.run();
}
/*
* Default vs Concrete
*
* interface I { int m() default { return 1; } }
* class C implements I { public int m() { return 2; } }
*
* TEST: [C|I] c = new C(); c.m() == 2;
*/
public void testDefaultVsConcrete() {
TestBuilder b = factory.getBuilder();
Interface I = b.intf("I")
.defaultMethod("m", "()I").returns(1).build()
.build();
ConcreteClass C = b.clazz("C").implement(I)
.concreteMethod("m", "()I").returns(2).build()
.build();
b.test()
.callSite(I, C, "m", "()I")
.returns(2)
.done()
.test()
.callSite(C, C, "m", "()I")
.returns(2)
.done()
.run();
}
/*
* InheritedDefault
*
* interface I { int m() default { return 1; } }
* class B implements I {}
* class C extends B {}
*
* TEST: [I|B|C] v = new C(); v.m() == 1;
*/
public void testInheritedDefault() {
TestBuilder b = factory.getBuilder();
Interface I = b.intf("I")
.defaultMethod("m", "()I").returns(1).build()
.build();
ConcreteClass B = b.clazz("B").implement(I).build();
ConcreteClass C = b.clazz("C").extend(B).build();
b.test()
.callSite(I, C, "m","()I")
.returns(1)
.done()
.test()
.callSite(B, C, "m","()I")
.returns(1)
.done()
.test()
.callSite(C, C, "m","()I")
.returns(1)
.done()
.run();
}
/*
* ExistingInherited
*
* interface I { int m() default { return 1; } }
* class B { public int m() { return 2; } }
* class C extends B implements I {}
*
* TEST: [I|B|C] v = new C(); v.m() == 2;
*/
public void testExistingInherited() {
TestBuilder b = factory.getBuilder();
Interface I = b.intf("I")
.defaultMethod("m", "()I").returns(1).build()
.build();
ConcreteClass B = b.clazz("B")
.concreteMethod("m", "()I").returns(2).build()
.build();
ConcreteClass C = b.clazz("C").extend(B).implement(I).build();
b.test()
.callSite(I, C, "m","()I")
.returns(2)
.done()
.test()
.callSite(B, C, "m","()I")
.returns(2)
.done()
.test()
.callSite(C, C, "m","()I")
.returns(2)
.done()
.run();
}
/*
* ExistingInheritedOverride
*
* interface I { int m() default { return 1; } }
* class B implements I { public int m() { return 2; } }
* class C extends B { public int m() { return 3; } }
*
* TEST: [I|B|D] v = new C(); v.m() == 3;
*/
public void testExistingInheritedOverride() {
TestBuilder b = factory.getBuilder();
Interface I = b.intf("I")
.defaultMethod("m", "()I").returns(1).build()
.build();
ConcreteClass B = b.clazz("B").implement(I)
.concreteMethod("m", "()I").returns(2).build()
.build();
ConcreteClass C = b.clazz("C").extend(B)
.concreteMethod("m", "()I").returns(3).build()
.build();
b.test()
.callSite(I, C, "m","()I")
.returns(3)
.done()
.test()
.callSite(B, C, "m","()I")
.returns(3)
.done()
.test()
.callSite(C, C, "m","()I")
.returns(3)
.done()
.run();
}
/*
* ExistingInheritedPlusDefault
*
* interface I { int m() default { return 11; } }
* interface J { int m() default { return 12; } }
* class C implements I { public int m() { return 21; } }
* class D extends C { public int m() { return 22; } }
* class E extends D implements J {}
*
* TEST: [I|J|C|D|J] v = new E(); v.m() == 22;
*/
public void testExistingInheritedPlusDefault() {
TestBuilder b = factory.getBuilder();
Interface I = b.intf("I")
.defaultMethod("m", "()I").returns(11).build()
.build();
Interface J = b.intf("J")
.defaultMethod("m", "()I").returns(12).build()
.build();
ConcreteClass C = b.clazz("C").implement(I)
.concreteMethod("m","()I").returns(21).build()
.build();
ConcreteClass D = b.clazz("D").extend(C)
.concreteMethod("m", "()I").returns(22).build()
.build();
ConcreteClass E = b.clazz("E").extend(D).implement(J)
.build();
b.test()
.callSite(I, E, "m","()I")
.returns(22)
.done()
.test()
.callSite(J, E, "m","()I")
.returns(22)
.done()
.test()
.callSite(C, E, "m","()I")
.returns(22)
.done()
.test()
.callSite(D, E, "m","()I")
.returns(22)
.done()
.test()
.callSite(E, E, "m","()I")
.returns(22)
.done()
.run();
}
/*
* InheritedWithConcrete
*
* interface I { int m() default { return 1; } }
* class B implements I {}
* class C extends B { public int m() { return 2; } }
*
* TEST: [I|B|C] v = new C(); v.m() == 2;
*/
public void testInheritedWithConcrete() {
TestBuilder b = factory.getBuilder();
Interface I = b.intf("I")
.defaultMethod("m", "()I").returns(1).build()
.build();
ConcreteClass B = b.clazz("B").implement(I).build();
ConcreteClass C = b.clazz("C").extend(B)
.concreteMethod("m", "()I").returns(2).build()
.build();
b.test()
.callSite(I, C, "m","()I")
.returns(2)
.done()
.test()
.callSite(B, C, "m","()I")
.returns(2)
.done()
.test()
.callSite(C, C, "m","()I")
.returns(2)
.done()
.run();
}
/*
* InheritedWithConcreteAndImpl
*
* interface I { int m() default { return 1; } }
* class B implements I {}
* class C extends B implements I { public int m() { return 2; } }
*
* TEST: [I|B|C] v = new C(); v.m() == 2;
*/
public void testInheritedWithConcreteAndImpl() {
TestBuilder b = factory.getBuilder();
Interface I = b.intf("I")
.defaultMethod("m", "()I").returns(1).build()
.build();
ConcreteClass B = b.clazz("B").implement(I).build();
ConcreteClass C = b.clazz("C").extend(B)
.concreteMethod("m", "()I").returns(2).build()
.build();
b.test()
.callSite(I, C, "m","()I")
.returns(2)
.done()
.test()
.callSite(B, C, "m","()I")
.returns(2)
.done()
.test()
.callSite(C, C, "m","()I")
.returns(2)
.done()
.run();
}
/*
* Diamond
*
* interface I { int m() default { return 1; } }
* interface J extends I {}
* interface K extends I {}
* class C implements J, K {}
*
* TEST: [I|J|K|C] c = new C(); c.m() == 99
*/
@KnownFailure(modes = { INVOKE_EXACT, INVOKE_GENERIC, INVOKE_WITH_ARGS, INDY }) // Test2_J_C_m, Test3_K_C_m: AME => IAE => ICCE instead of successful call
public void testDiamond() {
TestBuilder b = factory.getBuilder();
Interface I = b.intf("I")
.defaultMethod("m", "()I").returns(1).build()
.build();
Interface J = b.intf("J").extend(I).build();
Interface K = b.intf("K").extend(I).build();
ConcreteClass C = b.clazz("C").implement(J,K)
.build();
b.test()
.callSite(I, C, "m","()I")
.returns(1)
.done()
.test()
.callSite(J, C, "m","()I")
.returns(1)
.done()
.test()
.callSite(K, C, "m","()I")
.returns(1)
.done()
.test()
.callSite(C, C, "m","()I")
.returns(1)
.done()
.run();
}
/*
* ExpandedDiamond
*
* interface I { int m() default { return 1; } }
* interface J extends I {}
* interface K extends I {}
* interface L extends I {}
* interface M extends I {}
* class C implements J, K, L, M {}
*
* TEST: [I|J|K|L|M|C] c = new C(); c.m() == 1
*/
@KnownFailure(modes = { INVOKE_EXACT, INVOKE_GENERIC, INVOKE_WITH_ARGS, INDY }) // Test2_J_C_m, Test3_K_C_m, Test4_L_C_m, Test5_M_C_m:
// AME => IAE => ICCE instead of successful call
public void testExpandedDiamond() {
TestBuilder b = factory.getBuilder();
Interface I = b.intf("I")
.defaultMethod("m", "()I").returns(1).build()
.build();
Interface J = b.intf("J").extend(I).build();
Interface K = b.intf("K").extend(I).build();
Interface L = b.intf("L").extend(I).build();
Interface M = b.intf("M").extend(I).build();
ConcreteClass C = b.clazz("C").implement(J,K,L,M)
.build();
b.test()
.callSite(I, C, "m","()I")
.returns(1)
.done()
.test()
.callSite(J, C, "m","()I")
.returns(1)
.done()
.test()
.callSite(K, C, "m","()I")
.returns(1)
.done()
.test()
.callSite(L, C, "m","()I")
.returns(1)
.done()
.test()
.callSite(M, C, "m","()I")
.returns(1)
.done()
.test()
.callSite(C, C, "m","()I")
.returns(1)
.done()
.run();
}
/*
* SelfFill w/ explicit bridge
*
* interface I<T> { int m(T t) default { return 1; } }
* class C implements I<C> {
* public int m(C s) { return 2; }
* public int m(Object o) { ... }
* }
*
* TEST: I i = new C(); i.m((Object)null) == 2;
* TEST: C c = new C(); c.m((Object)null) == 2;
* TEST: C c = new C(); c.m((C)null) == 2;
*/
public void testSelfFillWithExplicitBridge() {
TestBuilder b = factory.getBuilder();
/* interface I<T> { ... */
Interface I = b.intf("I").sig("<T:Ljava/lang/Object;>Ljava/lang/Object;")
/* default int m(T t) { return 1; } */
.defaultMethod("m", "(Ljava/lang/Object;)I")
.sig("(TT;)I")
.returns(1)
.build()
.build();
/* class C implements I<C> { ... */
ConcreteClass C = b.clazz("C").implement(I)
.sig("Ljava/lang/Object;LI<LC;>;")
/* public int m(I i) { return 2; } */
.concreteMethod("m","(LC;)I").returns(2).build()
/* bridge method for m(LI;)I */
.concreteMethod("m","(Ljava/lang/Object;)I")
.flags(ACC_PUBLIC | ACC_BRIDGE | ACC_SYNTHETIC)
.returns(2)
.build()
.build();
// I i = new C(); ...
b.test()
.callSite(I, C, "m", "(Ljava/lang/Object;)I")
.params(new NullParam())
.returns(2)
.done()
// C c = new C(); ...
.test()
.callSite(C, C, "m", "(Ljava/lang/Object;)I")
.params(new NullParam())
.returns(2)
.done()
.test()
.callSite(C, C, "m", "(LC;)I")
.params(new NullParam())
.returns(2)
.done()
.run();
}
/*
* interface I { int m() default { return 1; } }
* class C implements I { int m(int i) { return 2; } }
*
* TEST: C c = new C(); c.m(0) == 2;
* TEST: I i = new C(); i.m() == 1;
*/
public void testMixedArity() {
TestBuilder b = factory.getBuilder();
Interface I =
b.intf("I")
.defaultMethod("m", "()I").returns(1)
.build()
.build();
ConcreteClass C =
b.clazz("C").implement(I)
.concreteMethod("m", "(I)I").returns(2)
.build()
.build();
b.test().callSite(I, C, "m", "()I")
.returns(1)
.build();
b.test().callSite(C, C, "m", "(I)I").params(ICONST_0)
.returns(2)
.build();
b.run();
}
/*
* interface I { int m() default { return 1; } }
* interface J { int m(int i) default { return 2; } }
* class C implements I, J {}
*
* TEST: I i = new C(); i.m() == 1; i.m(0) ==> NSME
* TEST: J j = new C(); j.m() ==> NSME; j.m(0) == 2
* TEST: C c = new C(); c.m() == 1; c.m(0) == 2
*/
@KnownFailure(modes = { INVOKE_EXACT, INVOKE_GENERIC, INDY }) //Test2_I_C_m, Test3_J_C_m: NSMError => NSMException => ICCE instead of NSME
public void testConflictingDefaultMixedArity1() {
TestBuilder b = factory.getBuilder();
Interface I = b.intf("I")
.defaultMethod("m", "()I").returns(1)
.build()
.build();
Interface J = b.intf("J")
.defaultMethod("m", "(I)I").returns(2)
.build()
.build();
ConcreteClass C = b.clazz("C").implement(I,J).build();
// I i = new C(); ...
b.test().callSite(I, C, "m", "()I")
.returns(1)
.build();
b.test().callSite(I, C, "m", "(I)I").params(ICONST_0)
.throws_(NoSuchMethodError.class)
.build();
// J j = new C(); ...
b.test().callSite(J, C, "m", "()I")
.throws_(NoSuchMethodError.class)
.build();
b.test().callSite(J, C, "m", "(I)I").params(ICONST_0)
.returns(2)
.build();
// C c = new C(); ...
b.test().callSite(C, C, "m", "()I")
.returns(1)
.build();
b.test().callSite(C, C, "m", "(I)I").params(ICONST_0)
.returns(2)
.build();
b.run();
}
/*
* interface I { int m() default { return 1; } }
* interface J { int m() default { return 2; } }
* class C implements I, J {
* int m(int i) { return 3; }
* }
*
* TEST: I i = new C(); i.m(0) ==> ICCE
* TEST: J j = new C(); j.m(0) ==> ICCE
* TEST: C c = new C(); c.m() ==> ICCE; c.m(0) == 3
*/
@KnownFailure(modes = { INVOKE_EXACT, INVOKE_GENERIC, INDY })
//Test2_I_C_m, Test3_J_C_m: NSMError => NSMException => ICCE instead of NSME
public void testConflictingDefaultMixedArity2() {
TestBuilder b = factory.getBuilder();
Interface I = b.intf("I")
.defaultMethod("m", "()I").returns(1)
.build()
.build();
Interface J = b.intf("J")
.defaultMethod("m", "()I").returns(2)
.build()
.build();
ConcreteClass C = b.clazz("C").implement(I, J)
.concreteMethod("m", "(I)I").returns(3)
.build()
.build();
// I i = new C(); ...
b.test().callSite(I, C, "m", "()I")
.throws_(IncompatibleClassChangeError.class)
.build();
b.test().callSite(I, C, "m", "(I)I").params(ICONST_0)
.throws_(NoSuchMethodError.class)
.build();
// J j = new C(); ...
b.test().callSite(J, C, "m", "()I")
.throws_(IncompatibleClassChangeError.class)
.build();
b.test().callSite(J, C, "m", "(I)I").params(ICONST_0)
.throws_(NoSuchMethodError.class)
.build();
// C c = new C(); ...
b.test().callSite(C, C, "m", "()I")
.throws_(IncompatibleClassChangeError.class)
.build();
b.test().callSite(C, C, "m", "(I)I").params(ICONST_0)
.returns(3)
.build();
b.run();
}
/* In package1:
* package p1;
* interface I {
* default int m() { return 10; };
* }
* public interface J extends I {};
*
* In package2:
* class A implements p1.J {}
* A myA = new A;
* myA.m(); // should return 10 except for reflect mode,
* // throw IllegalAccessException with reflect mode
* B myB = new B; // not related
*/
public void testMethodResolvedInDifferentPackage() {
TestBuilder b = factory.getBuilder();
Interface I = b.intf("p1.I").flags(~ACC_PUBLIC & ACC_PUBLIC) // make it package private
.defaultMethod("m", "()I").returns(10)
.build()
.build();
Interface J = b.intf("p1.J").extend(I)
.build();
ConcreteClass myA = b.clazz("p2.A").implement(J)
.build();
if (!factory.getExecutionMode().equals("REFLECTION")) {
b.test()
.callSite(myA, myA, "m", "()I")
.returns(10)
.done()
.run();
// -mode reflect will fail with IAE as expected
} else {
b.test()
.callSite(myA, myA, "m", "()I")
.throws_(IllegalAccessException.class)
.done()
.run();
}
ConcreteClass myB = b.clazz("p2.B").build();
}
/* In package p1:
* package p1;
* interface I {
* public default int m() { return 12; };
* }
*
* public class A implements I {}
*
* In package p2:
* package p2;
* public interface J { int m(); }
*
* public class B extends p1.A implements J {
* public int m() { return 13; }
* }
*
* Then:
* A myA = new B;
* myA.m(); // should return 13, not throw IllegalAccessError
*/
public void testMethodResolvedInLocalFirst() {
TestBuilder b = factory.getBuilder();
Interface I = b.intf("p1.I")
.defaultMethod("m", "()I").returns(12)
.build()
.build();
ConcreteClass myA = b.clazz("p1.A").implement(I)
.build();
Interface J = b.intf("p2.J").abstractMethod("m", "()I")
.build()
.build();
ConcreteClass myB = b.clazz("p2.B").extend(myA).implement(J)
.concreteMethod("m", "()I").returns(13)
.build()
.build();
b.test()
.callSite(myB, myB, "m", "()I")
.returns(13)
.done()
.run();
}
}