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annotate graal/com.oracle.truffle.interop/src/com/oracle/truffle/interop/ForeignAccessArguments.java @ 21226:2f2fac20c446

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author Josef Eisl <josef.eisl@jku.at>
date Thu, 23 Apr 2015 11:30:36 +0200
parents ab451b6de9f8
children
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1 /*
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2 * Copyright (c) 2014, 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. Oracle designates this
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8 * particular file as subject to the "Classpath" exception as provided
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9 * by Oracle in the LICENSE file that accompanied this code.
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10 *
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11 * This code is distributed in the hope that it will be useful, but WITHOUT
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 * version 2 for more details (a copy is included in the LICENSE file that
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15 * accompanied this code).
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16 *
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17 * You should have received a copy of the GNU General Public License version
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18 * 2 along with this work; if not, write to the Free Software Foundation,
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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20 *
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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22 * or visit www.oracle.com if you need additional information or have any
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23 * questions.
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24 */
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25 package com.oracle.truffle.interop;
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26
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27 import com.oracle.truffle.api.*;
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28
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29 public final class ForeignAccessArguments {
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30 public static final Object[] EMPTY_ARGUMENTS_ARRAY = new Object[0];
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31 public static final int RECEIVER_INDEX = 0;
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32 public static final int RUNTIME_ARGUMENT_COUNT = 1;
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33
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34 public static Object[] create(Object receiver) {
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35 return new Object[]{receiver};
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36 }
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37
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38 public static Object[] create(Object receiver, Object[] arguments) {
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39 Object[] objectArguments = new Object[RUNTIME_ARGUMENT_COUNT + arguments.length];
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40 objectArguments[RECEIVER_INDEX] = receiver;
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41 arraycopy(arguments, 0, objectArguments, RUNTIME_ARGUMENT_COUNT, arguments.length);
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42 return objectArguments;
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43 }
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44
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45 public static Object getArgument(Object[] arguments, int index) {
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46 return arguments[RUNTIME_ARGUMENT_COUNT + index];
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47 }
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48
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49 public static Object getReceiver(Object[] arguments) {
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50 return arguments[RECEIVER_INDEX];
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51 }
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52
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53 public static Object[] extractUserArguments(Object[] arguments) {
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54 return copyOfRange(arguments, RUNTIME_ARGUMENT_COUNT, arguments.length);
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55 }
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56
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57 public static Object[] extractUserArguments(int skip, Object[] arguments) {
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58 return copyOfRange(arguments, RUNTIME_ARGUMENT_COUNT + skip, arguments.length);
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59 }
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60
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61 public static int getUserArgumentCount(Object[] arguments) {
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62 return arguments.length - RUNTIME_ARGUMENT_COUNT;
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63 }
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64
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65 private static Object[] copyOfRange(Object[] original, int from, int to) {
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66 int newLength = to - from;
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67 if (newLength < 0) {
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68 CompilerDirectives.transferToInterpreter();
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69 throw new IllegalArgumentException(from + " > " + to);
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70 }
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71 Object[] copy = new Object[newLength];
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72 arraycopy(original, from, copy, 0, Math.min(original.length - from, newLength));
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73 return copy;
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74 }
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75
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76 private static void arraycopy(Object[] src, int srcPos, Object[] dest, int destPos, int length) {
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77 for (int i = 0; i < length; i++) {
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78 dest[destPos + i] = src[srcPos + i];
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79 }
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80 }
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81
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82 }