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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/RootNode.java @ 16067:915ebb306fcc

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Truffle/Source: major API revision - All source-related classes now in com.oracle.truffle.api.source - SourceFactory replaced with factory methods on Source - Revision, renaming, and documentation to methods on Source and SourceSection - NullSourceSection is now a utility class
author Michael Van De Vanter <michael.van.de.vanter@oracle.com>
date Fri, 06 Jun 2014 17:51:47 -0700
parents 04703cff4ef2
children ab62800259ff
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1 /*
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2 * Copyright (c) 2012, 2013, 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. Oracle designates this
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8 * particular file as subject to the "Classpath" exception as provided
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9 * by Oracle in the LICENSE file that accompanied this code.
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10 *
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11 * This code is distributed in the hope that it will be useful, but WITHOUT
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 * version 2 for more details (a copy is included in the LICENSE file that
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15 * accompanied this code).
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16 *
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17 * You should have received a copy of the GNU General Public License version
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18 * 2 along with this work; if not, write to the Free Software Foundation,
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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20 *
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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22 * or visit www.oracle.com if you need additional information or have any
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23 * questions.
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24 */
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25 package com.oracle.truffle.api.nodes;
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27 import com.oracle.truffle.api.*;
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28 import com.oracle.truffle.api.frame.*;
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29 import com.oracle.truffle.api.source.*;
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31 /**
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32 * A root node is a node with a method to execute it given only a frame as a parameter. Therefore, a
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33 * root node can be used to create a call target using
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34 * {@link TruffleRuntime#createCallTarget(RootNode)}.
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35 */
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36 public abstract class RootNode extends Node {
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37
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38 private RootCallTarget callTarget;
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39 private final FrameDescriptor frameDescriptor;
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40
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41 protected RootNode() {
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42 this(null, null);
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43 }
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44
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45 protected RootNode(SourceSection sourceSection) {
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46 this(sourceSection, null);
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47 }
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48
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49 protected RootNode(SourceSection sourceSection, FrameDescriptor frameDescriptor) {
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50 super(sourceSection);
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51 if (frameDescriptor == null) {
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52 this.frameDescriptor = new FrameDescriptor();
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53 } else {
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54 this.frameDescriptor = frameDescriptor;
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55 }
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56 }
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57
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58 /**
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59 * Creates a split {@link RootNode} based on the current {@link RootNode}. This method should
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60 * return an AST that was never executed and must not be shared with other {@link RootNode} or
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61 * {@link CallTarget} instances. This method is intended to be overridden by a subclass.
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62 *
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63 * @return the split {@link RootNode}
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64 */
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65 public RootNode split() {
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66 throw new UnsupportedOperationException();
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67 }
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68
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69 /**
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70 * Returns <code>true</code> if this {@link RootNode} can be split. A {@link RootNode} can be
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71 * split inside of a {@link CallTarget} that is invoked using a {@link DirectCallNode}. If this
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72 * method returns <code>true</code> a proper implementation of {@link #split()} must also be
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73 * provided. This method is intended to be overridden by a subclass.
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74 *
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75 * @return <code>true</code> if splittable else <code>false</code>.
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76 */
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77 public boolean isSplittable() {
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78 return false;
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79 }
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81 /**
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82 * Reports the execution count of a loop that is a child of this node. The optimization
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83 * heuristics can use the loop count to guide compilation and inlining.
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84 */
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85 public final void reportLoopCount(int count) {
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86 if (getCallTarget() instanceof LoopCountReceiver) {
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87 ((LoopCountReceiver) getCallTarget()).reportLoopCount(count);
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88 }
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89 }
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90
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91 /**
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92 * Executes this function using the specified frame and returns the result value.
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93 *
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94 * @param frame the frame of the currently executing guest language method
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95 * @return the value of the execution
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96 */
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97 public abstract Object execute(VirtualFrame frame);
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98
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99 public final RootCallTarget getCallTarget() {
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100 return callTarget;
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101 }
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102
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103 public final FrameDescriptor getFrameDescriptor() {
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104 return frameDescriptor;
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105 }
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106
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107 public final void setCallTarget(RootCallTarget callTarget) {
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108 this.callTarget = callTarget;
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109 }
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110
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111 }