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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/RootNode.java @ 14566:6681b9eb3f4c

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Truffle: API cleanup and javadoc for CallNodes.
author Christian Humer <christian.humer@gmail.com>
date Mon, 17 Mar 2014 14:29:45 +0100
parents 9c01fabfb167
children 1422f0bd55e3
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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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26
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27 import java.util.*;
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28
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29 import com.oracle.truffle.api.*;
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30 import com.oracle.truffle.api.frame.*;
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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 private final FrameDescriptor frameDescriptor;
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41
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42 /*
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43 * Internal set to keep back-references to the call-sites.
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44 */
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45 private final Set<CallNode> cachedCallNodes = Collections.newSetFromMap(new WeakHashMap<CallNode, Boolean>());
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46
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47 protected RootNode() {
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48 this(null, null);
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49 }
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50
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51 protected RootNode(SourceSection sourceSection) {
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52 this(sourceSection, null);
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53 }
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54
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55 protected RootNode(SourceSection sourceSection, FrameDescriptor frameDescriptor) {
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56 super(sourceSection);
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57 if (frameDescriptor == null) {
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58 this.frameDescriptor = new FrameDescriptor();
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59 } else {
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60 this.frameDescriptor = frameDescriptor;
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61 }
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62 }
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63
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64 /**
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65 * Creates a split {@link RootNode} based on the current {@link RootNode}. This method should
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66 * return an AST that was never executed and must not be shared with other {@link RootNode} or
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67 * {@link CallTarget} instances. This method is intended to be overridden by a subclass.
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68 *
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69 * @return the split {@link RootNode}
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70 */
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71 public RootNode split() {
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72 throw new UnsupportedOperationException();
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73 }
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74
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75 /**
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76 * Returns <code>true</code> if this {@link RootNode} can be split. A {@link RootNode} can be
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77 * split inside of a {@link CallTarget} that is invoked using a {@link CallNode}. If this method
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78 * returns <code>true</code> a proper implementation of {@link #split()} must also be provided.
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79 * This method is intended to be overridden by a subclass.
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80 *
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81 * @return <code>true</code> if splittable else <code>false</code>.
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82 */
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83 public boolean isSplittable() {
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84 return false;
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85 }
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86
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87 /**
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88 * Reports the execution count of a loop that is a child of this node. The optimization
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89 * heuristics can use the loop count to guide compilation and inlining.
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90 */
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91 public final void reportLoopCount(int count) {
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92 if (getCallTarget() instanceof LoopCountReceiver) {
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93 ((LoopCountReceiver) getCallTarget()).reportLoopCount(count);
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94 }
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95 }
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96
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97 /**
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98 * Executes this function using the specified frame and returns the result value.
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99 *
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100 * @param frame the frame of the currently executing guest language method
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101 * @return the value of the execution
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102 */
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103 public abstract Object execute(VirtualFrame frame);
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104
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105 public final RootCallTarget getCallTarget() {
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106 return callTarget;
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107 }
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108
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109 public final FrameDescriptor getFrameDescriptor() {
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110 return frameDescriptor;
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111 }
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112
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113 public final void setCallTarget(RootCallTarget callTarget) {
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114 this.callTarget = callTarget;
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115 }
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116
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117 /* Internal API. Do not use. */
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118 final void addCachedCallNode(CallNode callSite) {
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119 this.cachedCallNodes.add(callSite);
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120 }
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121
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122 /* Internal API. Do not use. */
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123 final void removeCachedCallNode(CallNode callSite) {
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124 this.cachedCallNodes.remove(callSite);
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125 }
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126
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127 /**
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128 * Returns a {@link Set} of {@link CallNode} nodes which are created to invoke this RootNode.
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129 * This method does not make any guarantees to contain all the {@link CallNode} nodes that are
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130 * invoking this method. Due to its weak nature the elements returned by this method may change
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131 * with each consecutive call.
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132 *
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133 * @return a set of {@link CallNode} nodes
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134 */
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135 public final Set<CallNode> getCachedCallNodes() {
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136 return Collections.unmodifiableSet(cachedCallNodes);
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137 }
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138
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139 }