Mercurial > hg > graal-compiler
annotate graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/controlflow/SLFunctionBodyNode.java @ 16685:888907296590
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author | Michael Van De Vanter <michael.van.de.vanter@oracle.com> |
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date | Fri, 01 Aug 2014 18:14:43 -0700 |
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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 referenced 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 super(null); |
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54 this.bodyNode = bodyNode; |
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55 } |
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56 |
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57 @Override |
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58 public Object executeGeneric(VirtualFrame frame) { |
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59 try { |
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60 /* Execute the function body. */ |
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61 bodyNode.executeVoid(frame); |
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62 |
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63 } catch (SLReturnException ex) { |
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64 /* |
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65 * In the interpreter, record profiling information that the function has an explicit |
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66 * return. |
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67 */ |
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68 exceptionTaken.enter(); |
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69 /* The exception transports the actual return value. */ |
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70 return ex.getResult(); |
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71 } |
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72 |
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73 /* |
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74 * In the interpreter, record profiling information that the function ends without an |
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75 * explicit return. |
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76 */ |
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77 nullTaken.enter(); |
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78 /* Return the default null value. */ |
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79 return SLNull.SINGLETON; |
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80 } |
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81 } |