1 /*
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3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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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
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22  */
23 
24 
25 package org.graalvm.compiler.replacements.nodes;
26 
27 import java.nio.ByteBuffer;
28 import java.nio.charset.Charset;
29 
30 import org.graalvm.compiler.core.common.type.DataPointerConstant;
31 import org.graalvm.compiler.core.common.type.StampFactory;
32 import org.graalvm.compiler.graph.Node.ConstantNodeParameter;
33 import org.graalvm.compiler.graph.Node.NodeIntrinsic;
34 import org.graalvm.compiler.graph.Node.NodeIntrinsicFactory;
35 import org.graalvm.compiler.nodes.ConstantNode;
36 import org.graalvm.compiler.nodes.graphbuilderconf.GraphBuilderContext;
37 import org.graalvm.compiler.word.Word;
38 
39 import jdk.vm.ci.meta.JavaKind;
40 
41 /**
42  * Represents a compile-time constant zero-terminated UTF-8 string installed with the generated
43  * code.
44  */
45 @NodeIntrinsicFactory
46 public final class CStringConstant extends DataPointerConstant {
47 
48     private static final Charset UTF8 = Charset.forName("utf8");
49 
50     private final String string;
51 
CStringConstant(String string)52     public CStringConstant(String string) {
53         super(1);
54         assert string != null;
55         this.string = string;
56     }
57 
58     @Override
getSerializedSize()59     public int getSerializedSize() {
60         return string.getBytes(UTF8).length + 1;
61     }
62 
63     @Override
serialize(ByteBuffer buffer)64     public void serialize(ByteBuffer buffer) {
65         byte[] bytes = string.getBytes(UTF8);
66         buffer.put(bytes);
67         buffer.put((byte) 0);
68     }
69 
70     @Override
toValueString()71     public String toValueString() {
72         return "c\"" + string + "\"";
73     }
74 
intrinsify(GraphBuilderContext b, String string)75     public static boolean intrinsify(GraphBuilderContext b, String string) {
76         b.addPush(JavaKind.Object, new ConstantNode(new CStringConstant(string), StampFactory.pointer()));
77         return true;
78     }
79 
80     @NodeIntrinsic
cstring(@onstantNodeParameter String string)81     public static native Word cstring(@ConstantNodeParameter String string);
82 }
83