| /* |
| * Copyright (c) 2013, 2015, 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.phases.verify; |
| |
| import java.util.List; |
| |
| import org.graalvm.compiler.graph.Node; |
| import org.graalvm.compiler.graph.Node.Input; |
| import org.graalvm.compiler.graph.Node.OptionalInput; |
| import org.graalvm.compiler.graph.NodeInputList; |
| import org.graalvm.compiler.nodes.StructuredGraph; |
| import org.graalvm.compiler.nodes.java.LoadFieldNode; |
| import org.graalvm.compiler.nodes.java.MethodCallTargetNode; |
| import org.graalvm.compiler.nodes.java.StoreFieldNode; |
| import org.graalvm.compiler.phases.VerifyPhase; |
| import org.graalvm.compiler.phases.tiers.PhaseContext; |
| |
| import jdk.vm.ci.meta.ResolvedJavaField; |
| import jdk.vm.ci.meta.ResolvedJavaMethod; |
| import jdk.vm.ci.meta.ResolvedJavaType; |
| |
| /** |
| * Try to ensure that methods which update {@link Input} or {@link OptionalInput} fields also |
| * include a call to {@link Node#updateUsages} or {@link Node#updateUsagesInterface}. |
| */ |
| public class VerifyUpdateUsages extends VerifyPhase<PhaseContext> { |
| |
| @Override |
| public boolean checkContract() { |
| return false; |
| } |
| |
| public VerifyUpdateUsages() { |
| } |
| |
| @Override |
| protected boolean verify(StructuredGraph graph, PhaseContext context) { |
| if (graph.method().isConstructor()) { |
| return true; |
| } |
| /* |
| * There are only two acceptable patterns for methods which update Node inputs, either a |
| * single StoreField node and invoke of updateUsages or updateUsagesInterface, or 2 |
| * StoreFields that come from LoadFields on the same object. Other patterns can be added as |
| * needed but it would be best to keep things simple so that verification can be simple. |
| */ |
| List<StoreFieldNode> stores = graph.getNodes().filter(StoreFieldNode.class).snapshot(); |
| ResolvedJavaType declaringClass = graph.method().getDeclaringClass(); |
| ResolvedJavaType nodeInputList = context.getMetaAccess().lookupJavaType(NodeInputList.class); |
| StoreFieldNode storeField1 = null; |
| StoreFieldNode storeField2 = null; |
| for (StoreFieldNode store : stores) { |
| if (isNodeInput(store.field(), declaringClass, nodeInputList)) { |
| if (storeField1 == null) { |
| storeField1 = store; |
| } else if (storeField2 == null) { |
| storeField2 = store; |
| } else { |
| return false; |
| } |
| } |
| } |
| if (storeField1 == null) { |
| return true; |
| } |
| if (storeField2 == null) { |
| // Single input field update so just check for updateUsages or updateUsagesInterface |
| // call |
| ResolvedJavaType node = context.getMetaAccess().lookupJavaType(Node.class); |
| for (MethodCallTargetNode call : graph.getNodes().filter(MethodCallTargetNode.class)) { |
| ResolvedJavaMethod callee = call.targetMethod(); |
| if (callee.getDeclaringClass().equals(node) && (callee.getName().equals("updateUsages") || callee.getName().equals("updateUsagesInterface"))) { |
| return true; |
| } |
| } |
| } else { |
| if (storeField1.value() instanceof LoadFieldNode && storeField2.value() instanceof LoadFieldNode) { |
| LoadFieldNode load1 = (LoadFieldNode) storeField1.value(); |
| LoadFieldNode load2 = (LoadFieldNode) storeField2.value(); |
| // Check for swapping values within the same object |
| if (load1.object() == storeField1.object() && load2.object() == storeField2.object() && storeField1.object() == storeField2.object() && |
| load1.field().equals(storeField2.field()) && load2.field().equals(storeField1.field())) { |
| return true; |
| } |
| } |
| } |
| return false; |
| } |
| |
| boolean isNodeInput(ResolvedJavaField field, ResolvedJavaType declaringClass, ResolvedJavaType nodeInputList) { |
| return declaringClass.isAssignableFrom(field.getDeclaringClass()) && (field.getAnnotation(Input.class) != null || field.getAnnotation(OptionalInput.class) != null) && |
| !field.getType().equals(nodeInputList); |
| } |
| } |