1 /*
   2  * Copyright (c) 2014, 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.nodes.type;
  24 
  25 import org.graalvm.compiler.core.common.LIRKind;
  26 import org.graalvm.compiler.core.common.spi.LIRKindTool;
  27 import org.graalvm.compiler.core.common.type.AbstractPointerStamp;
  28 import org.graalvm.compiler.core.common.type.Stamp;
  29 import org.graalvm.compiler.debug.GraalError;
  30 
  31 import jdk.vm.ci.meta.Constant;
  32 import jdk.vm.ci.meta.MetaAccessProvider;
  33 import jdk.vm.ci.meta.ResolvedJavaType;
  34 
  35 public abstract class MetaspacePointerStamp extends AbstractPointerStamp {
  36 
  37     protected MetaspacePointerStamp(boolean nonNull, boolean alwaysNull) {
  38         super(nonNull, alwaysNull);
  39     }
  40 
  41     @Override
  42     public LIRKind getLIRKind(LIRKindTool tool) {
  43         return tool.getWordKind();
  44     }
  45 
  46     @Override
  47     public Stamp empty() {
  48         // there is no empty pointer stamp
  49         return this;
  50     }
  51 
  52     @Override
  53     public boolean isCompatible(Constant constant) {
  54         return constant.isDefaultForKind();
  55     }
  56 
  57     @Override
  58     public boolean hasValues() {
  59         return true;
  60     }
  61 
  62     @Override
  63     public ResolvedJavaType javaType(MetaAccessProvider metaAccess) {
  64         throw GraalError.shouldNotReachHere("metaspace pointer has no Java type");
  65     }
  66 
  67     protected void appendString(StringBuilder str) {
  68         str.append(nonNull() ? "!" : "").append(alwaysNull() ? " NULL" : "");
  69     }
  70 
  71 }