Mercurial > hg > truffle
annotate graal/com.oracle.jvmci.common/src/com/oracle/jvmci/common/UnsafeAccess.java @ 21696:ca140f8c35be
Empty pointer stamps are also non-null.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Wed, 03 Jun 2015 14:08:29 +0200 |
parents | 5e868236654f |
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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 } |