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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/RootNode.java @ 13804:3840d61e0e68

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author Christian Humer <christian.humer@gmail.com>
date Tue, 28 Jan 2014 12:52:57 +0100
parents e076c87ab175
children 641f22b1c6b8
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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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30 /**
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31 * 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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32 * root node can be used to create a call target using
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33 * {@link TruffleRuntime#createCallTarget(RootNode)}.
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34 */
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35 public abstract class RootNode extends Node {
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36
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37 private CallTarget callTarget;
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38 private final FrameDescriptor frameDescriptor;
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39
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40 protected RootNode() {
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41 this(null, null);
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42 }
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43
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44 protected RootNode(SourceSection sourceSection) {
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45 this(sourceSection, null);
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46 }
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47
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48 protected RootNode(SourceSection sourceSection, FrameDescriptor frameDescriptor) {
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49 super(sourceSection);
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50 if (frameDescriptor == null) {
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51 this.frameDescriptor = new FrameDescriptor();
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52 } else {
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53 this.frameDescriptor = frameDescriptor;
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54 }
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55 }
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56
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57 /**
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58 * Creates a copy of the current {@link RootNode} for use as inlined AST. The default
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59 * implementation copies this {@link RootNode} and all its children recursively. It is
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60 * recommended to override this method to provide an implementation that copies an uninitialized
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61 * version of this AST. An uninitialized version of an AST was usually never executed which
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62 * means that it has not yet collected any profiling feedback. Please note that changes in the
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63 * behavior of this method might also require changes in {@link #getInlineNodeCount()}.
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64 *
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65 * @see RootNode#getInlineNodeCount()
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66 * @see RootNode#isInlinable()
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67 *
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68 * @return the copied RootNode for inlining
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69 * @throws UnsupportedOperationException if {@link #isInlinable()} returns false
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70 */
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71 public RootNode inline() {
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72 if (!isInlinable()) {
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73 throw new UnsupportedOperationException("Inlining is not enabled.");
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74 }
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75 return NodeUtil.cloneNode(this);
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76 }
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77
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78 /**
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79 * Returns the number of nodes that would be returned if {@link #inline()} would get invoked.
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80 * This node count may be used for the calculation in a smart inlining heuristic.
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81 *
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82 * @see RootNode#inline()
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83 * @see RootNode#isInlinable()
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84 *
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85 * @return the number of nodes that will get inlined
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86 * @throws UnsupportedOperationException if {@link #isInlinable()} returns false
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87 */
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88 public int getInlineNodeCount() {
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89 if (!isInlinable()) {
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90 throw new UnsupportedOperationException("Inlining is not enabled.");
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91 }
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92 return NodeUtil.countNodes(this);
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93 }
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94
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95 /**
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96 * Returns true if this RootNode can be inlined. If this method returns true implementations of
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97 * {@link #inline()} and {@link #getInlineNodeCount()} must be provided. Returns
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98 * <code>true</code> by default.
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99 *
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100 * @see RootNode#inline()
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101 * @see RootNode#getInlineNodeCount()
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102 *
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103 * @return true if this RootNode can be inlined
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104 */
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105 public boolean isInlinable() {
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106 return true;
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107 }
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108
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109 /**
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110 * Executes this function using the specified frame and returns the result value.
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111 *
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112 * @param frame the frame of the currently executing guest language method
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113 * @return the value of the execution
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114 */
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115 public abstract Object execute(VirtualFrame frame);
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116
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117 public CallTarget getCallTarget() {
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118 return callTarget;
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119 }
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120
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121 public final FrameDescriptor getFrameDescriptor() {
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122 return frameDescriptor;
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123 }
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124
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125 public void setCallTarget(CallTarget callTarget) {
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126 this.callTarget = callTarget;
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127 }
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128 }