1 /*
   2  * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 package org.graalvm.compiler.phases.verify;
  24 
  25 import jdk.vm.ci.meta.ResolvedJavaMethod;
  26 import jdk.vm.ci.meta.ResolvedJavaType;
  27 import org.graalvm.compiler.debug.GraalError;
  28 import org.graalvm.compiler.graph.Graph;
  29 import org.graalvm.compiler.graph.Node;
  30 import org.graalvm.compiler.nodes.ConstantNode;
  31 import org.graalvm.compiler.nodes.Invoke;
  32 import org.graalvm.compiler.nodes.ParameterNode;
  33 import org.graalvm.compiler.nodes.PiNode;
  34 import org.graalvm.compiler.nodes.StructuredGraph;
  35 import org.graalvm.compiler.nodes.ValueNode;
  36 import org.graalvm.compiler.nodes.ValuePhiNode;
  37 import org.graalvm.compiler.nodes.ValueProxyNode;
  38 import org.graalvm.compiler.nodes.java.MethodCallTargetNode;
  39 import org.graalvm.compiler.nodes.java.NewInstanceNode;
  40 import org.graalvm.compiler.nodes.spi.LoweringProvider;
  41 import org.graalvm.compiler.phases.VerifyPhase;
  42 import org.graalvm.compiler.phases.tiers.PhaseContext;
  43 import org.graalvm.util.EconomicSet;
  44 
  45 import java.lang.reflect.Constructor;
  46 import java.lang.reflect.Method;
  47 
  48 public class VerifyGraphAddUsage extends VerifyPhase<PhaseContext> {
  49     private static final Method ADD_OR_UNIQUE;
  50     private static final Method CONSTRUCTOR_NEW_INSTANCE;
  51     private static final EconomicSet<Class<?>> ALLOWED_CLASSES = EconomicSet.create();
  52 
  53     static {
  54         try {
  55             ADD_OR_UNIQUE = Graph.class.getDeclaredMethod("addOrUnique", Node.class);
  56             CONSTRUCTOR_NEW_INSTANCE = Constructor.class.getDeclaredMethod("newInstance", Object[].class);
  57         } catch (NoSuchMethodException e) {
  58             throw new GraalError(e);
  59         }
  60 
  61         ALLOWED_CLASSES.add(Graph.class);
  62         ALLOWED_CLASSES.add(LoweringProvider.class);
  63     }
  64 
  65     @Override
  66     protected boolean verify(StructuredGraph graph, PhaseContext context) {
  67         boolean allowed = false;
  68         for (Class<?> cls : ALLOWED_CLASSES) {
  69             ResolvedJavaType declaringClass = graph.method().getDeclaringClass();
  70             if (context.getMetaAccess().lookupJavaType(cls).isAssignableFrom(declaringClass)) {
  71                 allowed = true;
  72             }
  73         }
  74         if (!allowed) {
  75             ResolvedJavaMethod addOrUniqueMethod = context.getMetaAccess().lookupJavaMethod(ADD_OR_UNIQUE);
  76             for (MethodCallTargetNode t : graph.getNodes(MethodCallTargetNode.TYPE)) {
  77                 ResolvedJavaMethod callee = t.targetMethod();
  78                 if (callee.equals(addOrUniqueMethod)) {
  79                     ValueNode nodeArgument = t.arguments().get(1);
  80                     EconomicSet<Node> seen = EconomicSet.create();
  81                     checkNonFactory(graph, seen, context, nodeArgument);
  82                 }
  83             }
  84         }
  85 
  86         return true;
  87     }
  88 
  89     private void checkNonFactory(StructuredGraph graph, EconomicSet<Node> seen, PhaseContext context, ValueNode node) {
  90         if (seen.contains(node)) {
  91             return;
  92         }
  93         seen.add(node);
  94 
  95         // Check where the value came from recursively, or if it is allowed.
  96         if (node instanceof ValuePhiNode) {
  97             for (ValueNode input : ((ValuePhiNode) node).values()) {
  98                 checkNonFactory(graph, seen, context, input);
  99             }
 100         } else if (node instanceof PiNode) {
 101             checkNonFactory(graph, seen, context, ((PiNode) node).object());
 102         } else if (node instanceof ParameterNode) {
 103             return;
 104         } else if (node instanceof ConstantNode) {
 105             return;
 106         } else if (node instanceof ValueProxyNode) {
 107             checkNonFactory(graph, seen, context, ((ValueProxyNode) node).value());
 108         } else if (node instanceof Invoke && ((Invoke) node).callTarget().targetMethod().equals(context.getMetaAccess().lookupJavaMethod(CONSTRUCTOR_NEW_INSTANCE))) {
 109             return;
 110         } else if (!(node instanceof NewInstanceNode)) {
 111             // In all other cases, the argument must be a new instance.
 112             throw new VerificationError("Must add node '%s' with inputs in method '%s' of class '%s'.",
 113                             node, graph.method().getName(), graph.method().getDeclaringClass().getName());
 114         }
 115     }
 116 
 117 }