1 /*
   2  * Copyright (c) 2013, 2015, 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.hotspot.phases;
  24 
  25 import static org.graalvm.compiler.nodes.ConstantNode.getConstantNodes;
  26 
  27 import org.graalvm.compiler.nodes.ConstantNode;
  28 import org.graalvm.compiler.nodes.StructuredGraph;
  29 import org.graalvm.compiler.nodes.type.StampTool;
  30 import org.graalvm.compiler.phases.VerifyPhase;
  31 import org.graalvm.compiler.phases.tiers.PhaseContext;
  32 
  33 import jdk.vm.ci.hotspot.HotSpotObjectConstant;
  34 import jdk.vm.ci.meta.JavaKind;
  35 
  36 /**
  37  * Checks for {@link #isIllegalObjectConstant(ConstantNode) illegal} object constants in a graph
  38  * processed for AOT compilation.
  39  *
  40  * @see LoadJavaMirrorWithKlassPhase
  41  */
  42 public class AheadOfTimeVerificationPhase extends VerifyPhase<PhaseContext> {
  43 
  44     @Override
  45     protected boolean verify(StructuredGraph graph, PhaseContext context) {
  46         for (ConstantNode node : getConstantNodes(graph)) {
  47             if (isIllegalObjectConstant(node)) {
  48                 throw new VerificationError("illegal object constant: " + node);
  49             }
  50         }
  51         return true;
  52     }
  53 
  54     public static boolean isIllegalObjectConstant(ConstantNode node) {
  55         return isObject(node) && !isNullReference(node) && !isInternedString(node) && !isDirectMethodHandle(node) && !isBoundMethodHandle(node);
  56     }
  57 
  58     private static boolean isObject(ConstantNode node) {
  59         return node.getStackKind() == JavaKind.Object;
  60     }
  61 
  62     private static boolean isNullReference(ConstantNode node) {
  63         return isObject(node) && node.isNullConstant();
  64     }
  65 
  66     private static boolean isDirectMethodHandle(ConstantNode node) {
  67         if (!isObject(node)) {
  68             return false;
  69         }
  70         return "Ljava/lang/invoke/DirectMethodHandle;".equals(StampTool.typeOrNull(node).getName());
  71     }
  72 
  73     private static boolean isBoundMethodHandle(ConstantNode node) {
  74         if (!isObject(node)) {
  75             return false;
  76         }
  77         return StampTool.typeOrNull(node).getName().startsWith("Ljava/lang/invoke/BoundMethodHandle");
  78     }
  79 
  80     private static boolean isInternedString(ConstantNode node) {
  81         if (!isObject(node)) {
  82             return false;
  83         }
  84 
  85         HotSpotObjectConstant c = (HotSpotObjectConstant) node.asConstant();
  86         return c.isInternedString();
  87     }
  88 }