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annotate truffle/com.oracle.truffle.sl/src/com/oracle/truffle/sl/builtins/SLReadlnBuiltin.java @ 22251:8dddde8b20d4

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Truffle/SL: provide an "unavailable" SourceSection for every RootNode, using a newly defined static name that identifies "SL Builtin" RootNodes.
author Michael Van De Vanter <michael.van.de.vanter@oracle.com>
date Thu, 24 Sep 2015 13:16:52 -0700
parents dc83cc1f94f2
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 * 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
c07e64ecb528 Update SL copyright headers to use UPL
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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.builtins;
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42
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43 import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
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44 import com.oracle.truffle.api.dsl.Specialization;
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45 import com.oracle.truffle.api.nodes.NodeInfo;
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46 import com.oracle.truffle.api.source.SourceSection;
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47 import com.oracle.truffle.sl.SLException;
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48 import com.oracle.truffle.sl.SLLanguage;
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49 import com.oracle.truffle.sl.runtime.SLContext;
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50
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51 import java.io.BufferedReader;
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52 import java.io.IOException;
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53
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54 /**
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55 * Builtin function that reads a String from the {@link SLContext#getInput() standard input}.
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56 */
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57 @NodeInfo(shortName = "readln")
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58 public abstract class SLReadlnBuiltin extends SLBuiltinNode {
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59
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60 public SLReadlnBuiltin() {
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61 super(SourceSection.createUnavailable(SLLanguage.builtinKind, "readln"));
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62 }
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63
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64 @Specialization
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65 public String readln() {
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66 String result = doRead(getContext().getInput());
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67 if (result == null) {
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68 /*
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69 * We do not have a sophisticated end of file handling, so returning an empty string is
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70 * a reasonable alternative. Note that the Java null value should never be used, since
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71 * it can interfere with the specialization logic in generated source code.
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72 */
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73 result = "";
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74 }
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75 return result;
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76 }
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77
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78 @TruffleBoundary
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79 private static String doRead(BufferedReader in) {
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80 try {
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81 return in.readLine();
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82 } catch (IOException ex) {
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83 throw new SLException(ex.getMessage());
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84 }
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85 }
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86 }