1 /*
   2  * Copyright (c) 2016, 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.replacements.nodes;
  24 
  25 import java.nio.ByteBuffer;
  26 import java.nio.charset.Charset;
  27 
  28 import org.graalvm.compiler.core.common.type.DataPointerConstant;
  29 import org.graalvm.compiler.core.common.type.StampFactory;
  30 import org.graalvm.compiler.graph.Node.ConstantNodeParameter;
  31 import org.graalvm.compiler.graph.Node.NodeIntrinsic;
  32 import org.graalvm.compiler.nodes.ConstantNode;
  33 import org.graalvm.compiler.nodes.graphbuilderconf.GraphBuilderContext;
  34 import org.graalvm.compiler.word.Word;
  35 
  36 import jdk.vm.ci.meta.JavaKind;
  37 import jdk.vm.ci.meta.ResolvedJavaMethod;
  38 
  39 /**
  40  * Represents a compile-time constant zero-terminated UTF-8 string installed with the generated
  41  * code.
  42  */
  43 public final class CStringConstant extends DataPointerConstant {
  44 
  45     private static final Charset UTF8 = Charset.forName("utf8");
  46 
  47     private final String string;
  48 
  49     public CStringConstant(String string) {
  50         super(1);
  51         assert string != null;
  52         this.string = string;
  53     }
  54 
  55     @Override
  56     public int getSerializedSize() {
  57         return string.getBytes(UTF8).length + 1;
  58     }
  59 
  60     @Override
  61     public void serialize(ByteBuffer buffer) {
  62         byte[] bytes = string.getBytes(UTF8);
  63         buffer.put(bytes);
  64         buffer.put((byte) 0);
  65     }
  66 
  67     @Override
  68     public String toValueString() {
  69         return "c\"" + string + "\"";
  70     }
  71 
  72     public static boolean intrinsify(GraphBuilderContext b, @SuppressWarnings("unused") ResolvedJavaMethod targetMethod, String string) {
  73         b.addPush(JavaKind.Object, new ConstantNode(new CStringConstant(string), StampFactory.pointer()));
  74         return true;
  75     }
  76 
  77     @NodeIntrinsic
  78     public static native Word cstring(@ConstantNodeParameter String string);
  79 }