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annotate graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/local/SLReadArgumentNode.java @ 16512:abe7128ca473
SL: upgrade source attribution
author | Michael Van De Vanter <michael.van.de.vanter@oracle.com> |
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date | Mon, 14 Jul 2014 16:51:41 -0700 |
parents | 64dcb92ee75a |
children | 87ea195b66ff |
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SL: Enhanced SimpleLanguage with support for if statements, function calls, function caching + inlining and builtins.
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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 * 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.truffle.sl.nodes.local; |
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24 |
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25 import com.oracle.truffle.api.frame.*; |
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26 import com.oracle.truffle.api.source.*; |
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27 import com.oracle.truffle.api.utilities.*; |
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28 import com.oracle.truffle.sl.nodes.*; |
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29 import com.oracle.truffle.sl.parser.*; |
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30 import com.oracle.truffle.sl.runtime.*; |
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31 |
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32 /** |
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33 * Reads a function argument. Arguments are passed in as an object array. |
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34 * <p> |
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35 * Arguments are not type-specialized. To ensure that repeated accesses within a method are |
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36 * specialized and can, e.g., be accessed without unboxing, all arguments are loaded into local |
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37 * variables {@link SLNodeFactory#addFormalParameter in the method prologue}. |
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38 */ |
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39 public class SLReadArgumentNode extends SLExpressionNode { |
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40 |
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41 /** The argument number, i.e., the index into the array of arguments. */ |
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42 private final int index; |
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43 |
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44 /** |
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45 * Profiling information, collected by the interpreter, capturing whether the function was |
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46 * called with fewer actual arguments than formal arguments. |
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47 */ |
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48 private final BranchProfile outOfBoundsTaken = new BranchProfile(); |
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49 |
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50 public SLReadArgumentNode(SourceSection src, int index) { |
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51 super(src); |
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52 this.index = index; |
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53 } |
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54 |
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55 @Override |
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56 public Object executeGeneric(VirtualFrame frame) { |
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57 Object[] args = frame.getArguments(); |
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58 if (index < args.length) { |
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59 return args[index]; |
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60 } else { |
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61 /* In the interpreter, record profiling information that the branch was used. */ |
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62 outOfBoundsTaken.enter(); |
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63 /* Use the default null value. */ |
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64 return SLNull.SINGLETON; |
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65 } |
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66 } |
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67 } |