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annotate graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/builtins/SLReadlnBuiltin.java @ 13882:afd6fa5e8229

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SL: Feedback from reviewers
author Christian Wimmer <christian.wimmer@oracle.com>
date Wed, 05 Feb 2014 08:02:15 -0800
parents b16ec83edc73
children abe7128ca473
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1 /*
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2 * Copyright (c) 2014, 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.builtins;
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24
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25 import java.io.*;
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26
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27 import com.oracle.truffle.api.CompilerDirectives.SlowPath;
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28 import com.oracle.truffle.api.dsl.*;
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29 import com.oracle.truffle.api.nodes.*;
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30 import com.oracle.truffle.sl.*;
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31 import com.oracle.truffle.sl.runtime.*;
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32
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33 /**
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34 * Builtin function that reads a String from the {@link SLContext#getInput() standard input}.
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35 */
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36 @NodeInfo(shortName = "readln")
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37 public abstract class SLReadlnBuiltin extends SLBuiltinNode {
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38
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39 @Specialization
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40 public String readln() {
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41 String result = doRead(getContext().getInput());
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42 if (result == null) {
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43 /*
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44 * We do not have a sophisticated end of file handling, so returning an empty string is
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45 * a reasonable alternative. Note that the Java null value should never be used, since
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46 * it can interfere with the specialization logic in generated source code.
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47 */
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48 result = "";
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49 }
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50 return result;
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51 }
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52
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53 @SlowPath
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54 private static String doRead(BufferedReader in) {
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55 try {
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56 return in.readLine();
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57 } catch (IOException ex) {
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58 throw new SLException(ex.getMessage());
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59 }
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60 }
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61 }