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annotate graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/controlflow/SLFunctionBodyNode.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 64c77f0577bb
children a08b8694f556
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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.controlflow;
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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.nodes.*;
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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.runtime.*;
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30
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31 /**
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32 * The body of a user-defined SL function. This is the node references by a {@link SLRootNode} for
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33 * user-defined functions. It handles the return value of a function: the {@link SLReturnNode return
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34 * statement} throws an {@link SLReturnException exception} with the return value. This node catches
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35 * the exception. If the method ends without an explicit {@code return}, return the
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36 * {@link SLNull#SINGLETON default null value}.
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37 */
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38 @NodeInfo(shortName = "body")
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39 public final class SLFunctionBodyNode extends SLExpressionNode {
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40
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41 /** The body of the function. */
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42 @Child private SLStatementNode bodyNode;
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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 had an
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46 * {@link SLReturnNode explicit return statement}. This allows the compiler to generate better
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47 * code.
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48 */
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49 private final BranchProfile exceptionTaken = new BranchProfile();
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50 private final BranchProfile nullTaken = new BranchProfile();
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51
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52 public SLFunctionBodyNode(SLStatementNode bodyNode) {
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53 /*
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54 * It is a Truffle requirement to call adoptChild(), which performs all the necessary steps
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55 * to add the new child to the node tree.
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56 */
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57 this.bodyNode = adoptChild(bodyNode);
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58 }
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59
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60 @Override
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61 public Object executeGeneric(VirtualFrame frame) {
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62 try {
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63 /* Execute the function body. */
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64 bodyNode.executeVoid(frame);
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65
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66 } catch (SLReturnException ex) {
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67 /*
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68 * In the interpreter, record profiling information that the function has an explicit
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69 * return.
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70 */
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71 exceptionTaken.enter();
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72 /* The exception transports the actual return value. */
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73 return ex.getResult();
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74 }
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75
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76 /*
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77 * In the interpreter, record profiling information that the function ends without an
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78 * explicit return.
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79 */
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80 nullTaken.enter();
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81 /* Return the default null value. */
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82 return SLNull.SINGLETON;
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83 }
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84 }