| /* |
| * Copyright (c) 2014, 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 org.graalvm.compiler.core.test; |
| |
| import jdk.vm.ci.meta.Assumptions.AssumptionResult; |
| import jdk.vm.ci.meta.ResolvedJavaMethod; |
| import jdk.vm.ci.meta.ResolvedJavaType; |
| |
| import org.junit.Ignore; |
| import org.junit.Test; |
| |
| import org.graalvm.compiler.debug.Debug; |
| import org.graalvm.compiler.debug.Debug.Scope; |
| import org.graalvm.compiler.nodes.ReturnNode; |
| import org.graalvm.compiler.nodes.StructuredGraph; |
| import org.graalvm.compiler.nodes.StructuredGraph.AllowAssumptions; |
| |
| /** |
| * This test illustrates problems and limitations with class hierarchy analysis when default methods |
| * are involved. |
| */ |
| public class FindUniqueDefaultMethodTest extends GraalCompilerTest { |
| |
| interface Interface1 { |
| default int v1() { |
| return 1; |
| } |
| } |
| |
| static class Implementor1 implements Interface1 { |
| int callV1() { |
| return v1(); |
| } |
| } |
| |
| static class Subclass1 extends Implementor1 { |
| |
| } |
| |
| /** |
| * HotSpot has an internal mismatch with CHA and default methods. The initial query says that |
| * it's a unique method but the verification code that ensures that a dependence of this kind |
| * would pass will fail an assert in debug mode. |
| */ |
| @Test |
| public void testFindUnique() { |
| ResolvedJavaType cType = getMetaAccess().lookupJavaType(Implementor1.class); |
| cType.initialize(); |
| ResolvedJavaMethod v1Method = getMetaAccess().lookupJavaMethod(this.getMethod(Interface1.class, "v1")); |
| AssumptionResult<ResolvedJavaMethod> method = cType.findUniqueConcreteMethod(v1Method); |
| assertDeepEquals(null, method); |
| } |
| |
| interface Interface2 { |
| default int v1() { |
| return 1; |
| } |
| } |
| |
| static class Base2 { |
| public int v2() { |
| return 1; |
| } |
| } |
| |
| static class Implementor2 extends Base2 implements Interface2 { |
| int callV1() { |
| return v1(); |
| } |
| |
| int callV2() { |
| return v2(); |
| } |
| } |
| |
| static class Subclass2 extends Implementor2 { |
| |
| } |
| |
| /** |
| * This test illustrates a common pattern where a method at the root of a hierarchy is the only |
| * implementation and can be statically inlined. |
| */ |
| @SuppressWarnings("unused") |
| @Test |
| public void testInherited() { |
| Subclass2 s = new Subclass2(); |
| testConstantReturn("runInherited", 1); |
| } |
| |
| /** |
| * Test same pattern as above but using default methods instead. HotSpot doesn't allow this |
| * version to be optimized. |
| */ |
| @SuppressWarnings("unused") |
| @Test |
| @Ignore("HotSpot CHA doesn't treat default methods like regular methods") |
| public void testDefault() { |
| Subclass2 s = new Subclass2(); |
| testConstantReturn("runDefault", 1); |
| } |
| |
| public int runDefault(Implementor2 i) { |
| return i.callV1(); |
| } |
| |
| public int runInherited(Implementor2 i) { |
| return i.callV2(); |
| } |
| |
| private void testConstantReturn(String name, Object value) { |
| StructuredGraph result = buildGraph(name); |
| ReturnNode ret = result.getNodes(ReturnNode.TYPE).first(); |
| assertDeepEquals(1, result.getNodes(ReturnNode.TYPE).count()); |
| |
| assertDeepEquals(true, ret.result().isConstant()); |
| assertDeepEquals(value, ret.result().asJavaConstant().asBoxedPrimitive()); |
| } |
| |
| @SuppressWarnings("try") |
| protected StructuredGraph buildGraph(final String snippet) { |
| try (Scope s = Debug.scope("InstanceOfTest", getMetaAccess().lookupJavaMethod(getMethod(snippet)))) { |
| StructuredGraph graph = parseEager(snippet, AllowAssumptions.YES); |
| compile(graph.method(), graph); |
| Debug.dump(Debug.BASIC_LOG_LEVEL, graph, snippet); |
| return graph; |
| } catch (Throwable e) { |
| throw Debug.handle(e); |
| } |
| } |
| } |