MetaspacePointerStamp.java revision 12651:6ef01bd40ce2 
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 */
23package org.graalvm.compiler.hotspot.nodes.type;
24
25import org.graalvm.compiler.core.common.LIRKind;
26import org.graalvm.compiler.core.common.spi.LIRKindTool;
27import org.graalvm.compiler.core.common.type.AbstractPointerStamp;
28import org.graalvm.compiler.core.common.type.Stamp;
29import org.graalvm.compiler.debug.GraalError;
30
31import jdk.vm.ci.meta.Constant;
32import jdk.vm.ci.meta.MetaAccessProvider;
33import jdk.vm.ci.meta.ResolvedJavaType;
34
35public 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}
72