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annotate jvmci/jdk.vm.ci.common/src/jdk/vm/ci/common/UnsafeUtil.java @ 23392:b3a816d3b844

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Backed out changeset: a920338dd4d4
author Doug Simon <doug.simon@oracle.com>
date Thu, 12 May 2016 11:06:49 +0200
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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 jdk.vm.ci.common;
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24
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25 import sun.misc.Unsafe;
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26
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27 /**
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28 * Utilities for operating on raw memory with {@link Unsafe}.
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29 */
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30 public class UnsafeUtil {
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31
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32 /**
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33 * Copies the contents of a {@link String} to a native memory buffer as a {@code '\0'}
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34 * terminated C string. The native memory buffer is allocated via
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35 * {@link Unsafe#allocateMemory(long)}. The caller is responsible for releasing the buffer when
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36 * it is no longer needed via {@link Unsafe#freeMemory(long)}.
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37 *
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38 * @return the native memory pointer of the C string created from {@code s}
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39 */
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40 public static long createCString(Unsafe unsafe, String s) {
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41 return writeCString(unsafe, s, unsafe.allocateMemory(s.length() + 1));
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42 }
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43
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44 /**
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45 * Reads a {@code '\0'} terminated C string from native memory and converts it to a
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46 * {@link String}.
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47 *
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48 * @return a Java string
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49 */
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50 public static String readCString(Unsafe unsafe, long address) {
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51 if (address == 0) {
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52 return null;
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53 }
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54 StringBuilder sb = new StringBuilder();
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55 for (int i = 0;; i++) {
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56 char c = (char) unsafe.getByte(address + i);
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57 if (c == 0) {
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58 break;
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59 }
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60 sb.append(c);
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61 }
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62 return sb.toString();
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63 }
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64
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65 /**
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66 * Writes the contents of a {@link String} to a native memory buffer as a {@code '\0'}
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67 * terminated C string. The caller is responsible for ensuring the buffer is at least
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68 * {@code s.length() + 1} bytes long. The caller is also responsible for releasing the buffer
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69 * when it is no longer.
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70 *
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71 * @return the value of {@code buf}
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72 */
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73 public static long writeCString(Unsafe unsafe, String s, long buf) {
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74 int size = s.length();
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75 for (int i = 0; i < size; i++) {
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76 unsafe.putByte(buf + i, (byte) s.charAt(i));
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77 }
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78 unsafe.putByte(buf + size, (byte) '\0');
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79 return buf;
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80 }
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81 }