1 /*
   2  * Copyright (c) 2018, 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 
  24 
  25 package org.graalvm.compiler.replacements;
  26 
  27 import org.graalvm.compiler.api.replacements.ClassSubstitution;
  28 import org.graalvm.compiler.api.replacements.MethodSubstitution;
  29 import org.graalvm.compiler.nodes.extended.JavaReadNode;
  30 import org.graalvm.compiler.nodes.extended.JavaWriteNode;
  31 import org.graalvm.compiler.nodes.graphbuilderconf.InvocationPlugin;
  32 
  33 // JaCoCo Exclude
  34 
  35 /**
  36  * Substitutions for {@code StringUTF16} methods for JDK9 and later.
  37  */
  38 @ClassSubstitution(className = "java.lang.StringUTF16", optional = true)
  39 public class StringUTF16Substitutions {
  40 
  41     @MethodSubstitution
  42     public static char getChar(byte[] value, int i) {
  43         ReplacementsUtil.runtimeAssert((i << 1) + 1 < value.length, "Trusted caller missed bounds check");
  44         return getCharDirect(value, i << 1);
  45     }
  46 
  47     /**
  48      * Will be intrinsified with an {@link InvocationPlugin} to a {@link JavaReadNode}.
  49      */
  50     public static native char getCharDirect(byte[] value, int i);
  51 
  52     @MethodSubstitution
  53     public static void putChar(byte[] value, int i, int c) {
  54         ReplacementsUtil.runtimeAssert((i << 1) + 1 < value.length, "Trusted caller missed bounds check");
  55         putCharDirect(value, i << 1, c);
  56     }
  57 
  58     /**
  59      * Will be intrinsified with an {@link InvocationPlugin} to a {@link JavaWriteNode}.
  60      */
  61     public static native void putCharDirect(byte[] value, int i, int c);
  62 }