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annotate truffle/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/local/SLReadArgumentNode.java @ 22157:dc83cc1f94f2

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Using fully qualified imports
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Wed, 16 Sep 2015 11:33:22 +0200
parents 503529c65456
children a63bda98cfdb
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1 /*
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2 * Copyright (c) 2012, 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 * The Universal Permissive License (UPL), Version 1.0
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6 *
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7 * Subject to the condition set forth below, permission is hereby granted to any
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8 * person obtaining a copy of this software, associated documentation and/or
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9 * data (collectively the "Software"), free of charge and under any and all
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10 * copyright rights in the Software, and any and all patent rights owned or
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11 * freely licensable by each licensor hereunder covering either (i) the
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12 * unmodified Software as contributed to or provided by such licensor, or (ii)
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13 * the Larger Works (as defined below), to deal in both
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14 *
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15 * (a) the Software, and
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16 *
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17 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
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18 * one is included with the Software each a "Larger Work" to which the Software
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19 * is contributed by such licensors),
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20 *
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21 * without restriction, including without limitation the rights to copy, create
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22 * derivative works of, display, perform, and distribute the Software and make,
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23 * use, sell, offer for sale, import, export, have made, and have sold the
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24 * Software and the Larger Work(s), and to sublicense the foregoing rights on
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25 * either these or other terms.
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26 *
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27 * This license is subject to the following condition:
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28 *
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29 * The above copyright notice and either this complete permission notice or at a
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30 * minimum a reference to the UPL must be included in all copies or substantial
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31 * portions of the Software.
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32 *
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33 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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34 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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35 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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36 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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37 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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38 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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39 * SOFTWARE.
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40 */
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41 package com.oracle.truffle.sl.nodes.local;
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42
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43 import com.oracle.truffle.api.frame.VirtualFrame;
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44 import com.oracle.truffle.api.source.SourceSection;
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45 import com.oracle.truffle.api.utilities.BranchProfile;
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46 import com.oracle.truffle.sl.nodes.SLExpressionNode;
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47 import com.oracle.truffle.sl.parser.SLNodeFactory;
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48 import com.oracle.truffle.sl.runtime.SLNull;
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49
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50 /**
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51 * Reads a function argument. Arguments are passed in as an object array.
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52 * <p>
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53 * Arguments are not type-specialized. To ensure that repeated accesses within a method are
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54 * specialized and can, e.g., be accessed without unboxing, all arguments are loaded into local
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55 * variables {@link SLNodeFactory#addFormalParameter in the method prologue}.
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56 */
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57 public class SLReadArgumentNode extends SLExpressionNode {
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58
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59 /** The argument number, i.e., the index into the array of arguments. */
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60 private final int index;
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61
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62 /**
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63 * Profiling information, collected by the interpreter, capturing whether the function was
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64 * called with fewer actual arguments than formal arguments.
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65 */
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66 private final BranchProfile outOfBoundsTaken = BranchProfile.create();
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67
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68 public SLReadArgumentNode(SourceSection src, int index) {
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69 super(src);
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70 this.index = index;
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71 }
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73 @Override
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74 public Object executeGeneric(VirtualFrame frame) {
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75 Object[] args = frame.getArguments();
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76 if (index < args.length) {
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77 return args[index];
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78 } else {
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79 /* In the interpreter, record profiling information that the branch was used. */
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80 outOfBoundsTaken.enter();
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81 /* Use the default null value. */
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82 return SLNull.SINGLETON;
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83 }
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84 }
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85 }