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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/RootNode.java @ 18162:ab62800259ff

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Truffle: renamed the splitting to callTargetCloning. Made RootNode cloning an implementation detail of the Truffle runtime.
author Christian Humer <christian.humer@gmail.com>
date Thu, 23 Oct 2014 17:20:10 +0200
parents 915ebb306fcc
children be1316e633b5
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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.CompilerDirectives.CompilationFinal;
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29 import com.oracle.truffle.api.frame.*;
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30 import com.oracle.truffle.api.source.*;
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31
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32 /**
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33 * 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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34 * root node can be used to create a call target using
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35 * {@link TruffleRuntime#createCallTarget(RootNode)}.
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36 */
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37 public abstract class RootNode extends Node {
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38
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39 private RootCallTarget callTarget;
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40 @CompilationFinal private FrameDescriptor frameDescriptor;
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41
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42 protected RootNode() {
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43 this(null, null);
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44 }
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45
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46 protected RootNode(SourceSection sourceSection) {
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47 this(sourceSection, null);
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48 }
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49
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50 protected RootNode(SourceSection sourceSection, FrameDescriptor frameDescriptor) {
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51 super(sourceSection);
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52 if (frameDescriptor == null) {
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53 this.frameDescriptor = new FrameDescriptor();
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54 } else {
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55 this.frameDescriptor = frameDescriptor;
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56 }
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57 }
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58
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59 @Override
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60 public Node copy() {
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61 RootNode root = (RootNode) super.copy();
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62 root.frameDescriptor = frameDescriptor.shallowCopy();
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63 return root;
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64 }
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65
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66 /**
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67 * Returns <code>true</code> if this {@link RootNode} is allowed to be cloned. The runtime
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68 * system might decide to create deep copies of the {@link RootNode} in order to gather context
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69 * sensitive profiling feedback. The default implementation returns <code>false</code>. Guest
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70 * language specific implementations may want to return <code>true</code> here to indicate that
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71 * gathering call site specific profiling information might make sense for this {@link RootNode}
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72 * .
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73 *
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74 * @return <code>true</code> if cloning is allowed else <code>false</code>.
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75 */
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76 public boolean isCloningAllowed() {
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77 return false;
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78 }
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80 /**
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81 * Reports the execution count of a loop that is a child of this node. The optimization
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82 * heuristics can use the loop count to guide compilation and inlining.
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83 */
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84 public final void reportLoopCount(int count) {
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85 if (getCallTarget() instanceof LoopCountReceiver) {
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86 ((LoopCountReceiver) getCallTarget()).reportLoopCount(count);
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87 }
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88 }
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89
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90 /**
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91 * Executes this function using the specified frame and returns the result value.
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92 *
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93 * @param frame the frame of the currently executing guest language method
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94 * @return the value of the execution
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95 */
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96 public abstract Object execute(VirtualFrame frame);
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97
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98 public final RootCallTarget getCallTarget() {
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99 return callTarget;
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100 }
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101
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102 public final FrameDescriptor getFrameDescriptor() {
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103 return frameDescriptor;
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104 }
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105
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106 public final void setCallTarget(RootCallTarget callTarget) {
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107 this.callTarget = callTarget;
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108 }
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109
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110 }