Mercurial > hg > graal-compiler
annotate graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/runtime/SLFunction.java @ 13986:bad45cad79ae
Truffle: Cleaned depracated API usage.
author | Christian Humer <christian.humer@gmail.com> |
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date | Thu, 20 Feb 2014 01:52:58 +0100 |
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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.runtime; |
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24 |
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25 import com.oracle.truffle.api.*; |
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26 import com.oracle.truffle.api.utilities.*; |
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27 |
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28 /** |
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29 * Represents a SL function. On the Truffle level, a callable element is represented by a |
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30 * {@link RootCallTarget call target}. This class encapsulates a call target, and adds version |
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31 * support: functions in SL can be redefined, i.e. changed at run time. When a function is |
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32 * redefined, the call target managed by this function object is changed (and {@link #callTarget} is |
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33 * therefore not a final field). |
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34 * <p> |
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35 * Function redefinition is expected to be rare, therefore optimized call nodes want to speculate |
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36 * that the call target is stable. This is possible with the help of a Truffle {@link Assumption}: a |
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37 * call node can keep the call target returned by {@link #getCallTarget()} cached until the |
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38 * assumption returned by {@link #getCallTargetStable()} is valid. |
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39 * <p> |
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40 * The {@link #callTarget} can be {@code null}. To ensure that only one {@link SLFunction} instance |
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41 * per name exists, the {@link SLFunctionRegistry} creates an instance also when performing name |
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42 * lookup. A function that has been looked up, i.e., used, but not defined, has no call target. |
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43 */ |
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44 public final class SLFunction { |
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45 |
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46 /** The name of the function. */ |
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47 private final String name; |
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48 |
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49 /** The current implementation of this function. */ |
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50 private RootCallTarget callTarget; |
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51 |
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52 /** |
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53 * Manages the assumption that the {@link #callTarget} is stable. We use the utility class |
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54 * {@link CyclicAssumption}, which automatically creates a new {@link Assumption} when the old |
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55 * one gets invalidated. |
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56 */ |
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57 private final CyclicAssumption callTargetStable; |
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58 |
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59 protected SLFunction(String name) { |
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60 this.name = name; |
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61 this.callTargetStable = new CyclicAssumption(name); |
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62 } |
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63 |
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64 public String getName() { |
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65 return name; |
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66 } |
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67 |
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68 protected void setCallTarget(RootCallTarget callTarget) { |
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69 this.callTarget = callTarget; |
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70 /* |
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71 * We have a new call target. Invalidate all code that speculated that the old call target |
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72 * was stable. |
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73 */ |
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74 callTargetStable.invalidate(); |
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75 } |
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76 |
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77 public RootCallTarget getCallTarget() { |
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78 return callTarget; |
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79 } |
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80 |
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81 public Assumption getCallTargetStable() { |
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82 return callTargetStable.getAssumption(); |
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83 } |
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84 |
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85 /** |
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86 * This method is, e.g., called when using a function literal in a string concatenation. So |
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87 * changing it has an effect on SL programs. |
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88 */ |
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89 @Override |
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90 public String toString() { |
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91 return name; |
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92 } |
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93 } |