Mercurial > hg > graal-compiler
view graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/builtins/SLReadlnBuiltin.java @ 15540:57131f2e001c
BciBlockMapping: make loop information more accessible.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Tue, 06 May 2014 11:09:19 +0200 |
parents | afd6fa5e8229 |
children | abe7128ca473 |
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/* * Copyright (c) 2014, 2014, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.oracle.truffle.sl.builtins; import java.io.*; import com.oracle.truffle.api.CompilerDirectives.SlowPath; import com.oracle.truffle.api.dsl.*; import com.oracle.truffle.api.nodes.*; import com.oracle.truffle.sl.*; import com.oracle.truffle.sl.runtime.*; /** * Builtin function that reads a String from the {@link SLContext#getInput() standard input}. */ @NodeInfo(shortName = "readln") public abstract class SLReadlnBuiltin extends SLBuiltinNode { @Specialization public String readln() { String result = doRead(getContext().getInput()); if (result == null) { /* * We do not have a sophisticated end of file handling, so returning an empty string is * a reasonable alternative. Note that the Java null value should never be used, since * it can interfere with the specialization logic in generated source code. */ result = ""; } return result; } @SlowPath private static String doRead(BufferedReader in) { try { return in.readLine(); } catch (IOException ex) { throw new SLException(ex.getMessage()); } } }