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annotate graal/com.oracle.jvmci.common/src/com/oracle/jvmci/common/UnsafeAccess.java @ 21548:f4b3a6dadb44

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moved Receiver inner class from MethodIdMap to InvocationPlugin (JBS:GRAAL-53)
author Doug Simon <doug.simon@oracle.com>
date Tue, 26 May 2015 11:19:50 +0200
parents 5e868236654f
children 5b9adb645217
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1 /*
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2 * Copyright (c) 2012, 2012, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.jvmci.common;
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24
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25 import java.lang.reflect.*;
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26
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27 import sun.misc.*;
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28
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29 public class UnsafeAccess {
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30
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31 /**
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32 * An instance of {@link Unsafe} for use within Graal.
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33 */
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34 public static final Unsafe unsafe;
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35
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36 static {
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37 try {
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38 Field theUnsafeInstance = Unsafe.class.getDeclaredField("theUnsafe");
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39 theUnsafeInstance.setAccessible(true);
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40 unsafe = (Unsafe) theUnsafeInstance.get(Unsafe.class);
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41 } catch (Exception e) {
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42 throw new RuntimeException("exception while trying to get Unsafe", e);
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43 }
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44 }
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45
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46 /**
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47 * Copies the contents of a {@link String} to a native memory buffer as a {@code '\0'}
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48 * terminated C string. The native memory buffer is allocated via
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49 * {@link Unsafe#allocateMemory(long)}. The caller is responsible for releasing the buffer when
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50 * it is no longer needed via {@link Unsafe#freeMemory(long)}.
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51 *
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52 * @return the native memory pointer of the C string created from {@code s}
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53 */
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54 public static long createCString(String s) {
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55 return writeCString(s, unsafe.allocateMemory(s.length() + 1));
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56 }
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57
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58 /**
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59 * Reads a {@code '\0'} terminated C string from native memory and converts it to a
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60 * {@link String}.
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61 *
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62 * @return a Java string
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63 */
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64 public static String readCString(long address) {
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65 if (address == 0) {
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66 return null;
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67 }
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68 StringBuilder sb = new StringBuilder();
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69 for (int i = 0;; i++) {
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70 char c = (char) unsafe.getByte(address + i);
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71 if (c == 0) {
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72 break;
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73 }
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74 sb.append(c);
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75 }
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76 return sb.toString();
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77 }
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78
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79 /**
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80 * Writes the contents of a {@link String} to a native memory buffer as a {@code '\0'}
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81 * terminated C string. The caller is responsible for ensuring the buffer is at least
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82 * {@code s.length() + 1} bytes long. The caller is also responsible for releasing the buffer
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83 * when it is no longer.
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84 *
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85 * @return the value of {@code buf}
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86 */
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87 public static long writeCString(String s, long buf) {
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88 int size = s.length();
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89 for (int i = 0; i < size; i++) {
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90 unsafe.putByte(buf + i, (byte) s.charAt(i));
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91 }
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92 unsafe.putByte(buf + size, (byte) '\0');
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93 return buf;
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94 }
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95 }