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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/Node.java @ 10846:e87d56a51047

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Truffle: add Node.isReplaceable()
author Andreas Woess <andreas.woess@jku.at>
date Mon, 22 Jul 2013 18:07:53 +0200
parents 50f3f3958555
children 8c570011b86f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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a4b84ba6dc2e Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
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1 /*
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2 * Copyright (c) 2012, 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.api.nodes;
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24
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25 import java.lang.annotation.*;
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26 import java.util.*;
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27
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28 import com.oracle.truffle.api.*;
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29 import com.oracle.truffle.api.nodes.NodeInfo.Kind;
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31 /**
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32 * Abstract base class for all Truffle nodes.
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33 */
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34 public abstract class Node implements Cloneable {
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35
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36 private Node parent;
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37
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38 private SourceSection sourceSection;
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39
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40 /**
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41 * Marks array fields that are children of this node.
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42 */
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43 @Retention(RetentionPolicy.RUNTIME)
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44 @Target({ElementType.FIELD})
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45 public @interface Children {
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46 }
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47
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48 /**
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49 * Marks fields that represent child nodes of this node.
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50 */
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51 @Retention(RetentionPolicy.RUNTIME)
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52 @Target({ElementType.FIELD})
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53 public @interface Child {
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54 }
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55
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56 protected Node() {
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57 CompilerAsserts.neverPartOfCompilation();
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58 }
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59
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60 /**
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61 * Assigns a link to a guest language source section to this node.
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62 *
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63 * @param section the object representing a section in guest language source code
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64 */
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65 public final void assignSourceSection(SourceSection section) {
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66 if (sourceSection != null) {
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67 throw new IllegalStateException("Source section is already assigned.");
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68 }
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69 this.sourceSection = section;
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70 }
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71
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72 /**
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73 * Clears any previously assigned guest language source code from this node.
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74 */
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75 public final void clearSourceSection() {
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76 this.sourceSection = null;
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77 }
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79 /**
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80 * Retrieves the guest language source code section that is currently assigned to this node.
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81 *
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82 * @return the assigned source code section
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83 */
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84 public final SourceSection getSourceSection() {
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85 return sourceSection;
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86 }
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88 /**
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89 * Retrieves the guest language source code section that is currently assigned to this node.
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90 *
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91 * @return the assigned source code section
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92 */
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93 public final SourceSection getEncapsulatingSourceSection() {
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94 if (sourceSection == null && getParent() != null) {
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95 return getParent().getEncapsulatingSourceSection();
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96 }
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97 return sourceSection;
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98 }
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99
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100 /**
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101 * Method that updates the link to the parent in the array of specified new child nodes to this
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102 * node.
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103 *
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104 * @param newChildren the array of new children whose parent should be updated
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105 * @return the array of new children
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106 */
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107 protected final <T extends Node> T[] adoptChildren(T[] newChildren) {
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108 if (newChildren != null) {
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109 for (T n : newChildren) {
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110 adoptChild(n);
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111 }
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112 }
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113 return newChildren;
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114 }
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115
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116 /**
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117 * Method that updates the link to the parent in the specified new child node to this node.
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118 *
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119 * @param newChild the new child whose parent should be updated
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120 * @return the new child
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121 */
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122 protected final <T extends Node> T adoptChild(T newChild) {
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123 if (newChild != null) {
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124 if (newChild == this) {
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125 throw new IllegalStateException("The parent of a node can never be the node itself.");
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126 }
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127 ((Node) newChild).parent = this;
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128 }
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129 return newChild;
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130 }
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131
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132 /**
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133 * Returns properties of this node interesting for debugging and can be overwritten by
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134 * subclasses to add their own custom properties.
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135 *
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136 * @return the properties as a key/value hash map
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137 */
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138 public Map<String, Object> getDebugProperties() {
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139 Map<String, Object> properties = new HashMap<>();
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140 return properties;
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141 }
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142
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143 /**
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144 * The current parent node of this node.
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145 *
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146 * @return the parent node
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147 */
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148 public final Node getParent() {
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149 return parent;
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150 }
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151
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152 /**
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153 * Replaces this node with another node. If there is a source section (see
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154 * {@link #getSourceSection()}) associated with this node, it is transferred to the new node.
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155 *
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156 * @param newNode the new node that is the replacement
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157 * @param reason a description of the reason for the replacement
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158 * @return the new node
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159 */
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160 @SuppressWarnings({"unchecked"})
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161 public final <T extends Node> T replace(T newNode, String reason) {
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162 if (this.getParent() == null) {
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163 throw new IllegalStateException("This node cannot be replaced, because it does not yet have a parent.");
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164 }
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165 if (sourceSection != null) {
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166 // Pass on the source section to the new node.
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167 newNode.assignSourceSection(sourceSection);
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168 }
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169 onReplace(newNode, reason);
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170 return (T) this.getParent().replaceChild(this, newNode);
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171 }
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172
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173 private <T extends Node> T replaceChild(T oldChild, T newChild) {
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174 NodeUtil.replaceChild(this, oldChild, newChild);
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175 adoptChild(newChild);
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176 return newChild;
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177 }
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178
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179 /**
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180 * Replaces this node with another node. If there is a source section (see
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181 * {@link #getSourceSection()}) associated with this node, it is transferred to the new node.
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182 *
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183 * @param newNode the new node that is the replacement
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184 * @return the new node
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185 */
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186 public final <T extends Node> T replace(T newNode) {
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187 return replace(newNode, "");
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188 }
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189
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190 /**
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191 * Checks if this node is properly adopted by a parent and can be replaced.
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192 *
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193 * @return {@code true} if it is safe to replace this node.
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194 */
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195 public final boolean isReplaceable() {
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196 if (getParent() != null) {
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197 for (Node sibling : getParent().getChildren()) {
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198 if (sibling == this) {
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199 return true;
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200 }
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201 }
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202 }
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203 return false;
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204 }
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205
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206 /**
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207 * Intended to be implemented by subclasses of {@link Node} to receive a notification when the
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208 * node is rewritten. This method is invoked before the actual replace has happened.
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209 *
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210 * @param newNode the replacement node
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211 * @param reason the reason the replace supplied
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212 */
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213 protected void onReplace(Node newNode, String reason) {
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214 if (TruffleOptions.TraceRewrites) {
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215 Class<? extends Node> from = getClass();
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216 Class<? extends Node> to = newNode.getClass();
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217
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218 if (TruffleOptions.TraceRewritesFilterFromKind != null) {
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219 if (filterByKind(from, TruffleOptions.TraceRewritesFilterFromKind)) {
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220 return;
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221 }
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222 }
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223
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224 if (TruffleOptions.TraceRewritesFilterToKind != null) {
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225 if (filterByKind(to, TruffleOptions.TraceRewritesFilterToKind)) {
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226 return;
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227 }
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228 }
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229
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230 String filter = TruffleOptions.TraceRewritesFilterClass;
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231 if (filter != null && (filterByContainsClassName(from, filter) || filterByContainsClassName(to, filter))) {
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232 return;
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233 }
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234
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235 // CheckStyle: stop system..print check
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236 System.out.printf("[truffle] rewrite %-50s |From %-40s |To %-40s |Reason %s.%n", this.toString(), formatNodeInfo(from), formatNodeInfo(to), reason);
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237 // CheckStyle: resume system..print check
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238 }
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239 }
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240
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241 private static String formatNodeInfo(Class<? extends Node> clazz) {
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242 NodeInfo nodeInfo = clazz.getAnnotation(NodeInfo.class);
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243 String kind = "?";
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244 if (nodeInfo != null) {
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245 switch (nodeInfo.kind()) {
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246 case GENERIC:
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247 kind = "G";
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248 break;
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249 case SPECIALIZED:
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250 kind = "S";
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251 break;
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252 case UNINITIALIZED:
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253 kind = "U";
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254 break;
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255 case POLYMORPHIC:
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256 kind = "P";
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257 break;
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258 default:
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259 kind = "?";
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260 break;
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261 }
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262 }
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263 return kind + " " + clazz.getSimpleName();
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264 }
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265
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266 private static boolean filterByKind(Class<?> clazz, Kind kind) {
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267 NodeInfo info = clazz.getAnnotation(NodeInfo.class);
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268 if (info != null) {
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269 return info.kind() != kind;
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270 }
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271 return true;
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272 }
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273
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274 private static boolean filterByContainsClassName(Class<? extends Node> from, String filter) {
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275 Class<?> currentFrom = from;
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276 while (currentFrom != null) {
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277 if (currentFrom.getName().contains(filter)) {
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278 return false;
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279 }
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280 currentFrom = currentFrom.getSuperclass();
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281 }
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282 return true;
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283 }
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284
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285 /**
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286 * Invokes the {@link NodeVisitor#visit(Node)} method for this node and recursively also for all
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287 * child nodes.
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288 *
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289 * @param nodeVisitor the visitor
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290 */
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291 public final void accept(NodeVisitor nodeVisitor) {
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292 if (nodeVisitor.visit(this)) {
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293 for (Node child : this.getChildren()) {
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294 if (child != null) {
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295 child.accept(nodeVisitor);
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296 }
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297 }
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298 }
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299 }
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300
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301 /**
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302 * Iterator over the children of this node.
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303 *
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304 * @return the iterator
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305 */
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306 public final Iterable<Node> getChildren() {
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307 final Node node = this;
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308 return new Iterable<Node>() {
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309
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310 public Iterator<Node> iterator() {
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311 return new NodeUtil.NodeIterator(node);
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312 }
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313 };
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314 }
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315
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316 /**
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317 * Creates a shallow copy of this node.
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318 *
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319 * @return the new copy
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320 */
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321 public Node copy() {
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322 try {
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323 return (Node) super.clone();
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324 } catch (CloneNotSupportedException e) {
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325 return null;
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326 }
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327 }
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328
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329 /**
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330 * This method must never be called. It enforces that {@link Object#clone} is not directly
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331 * called by subclasses. Use the {@link #copy()} method instead.
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332 */
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333 @Override
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334 @Deprecated
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335 protected final Object clone() throws CloneNotSupportedException {
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336 throw new IllegalStateException("This method should never be called, use the copy method instead!");
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337 }
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338
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339 /**
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340 * Converts this node to a textual representation useful for debugging.
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341 */
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342 @Override
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343 public String toString() {
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344 StringBuilder sb = new StringBuilder(getClass().getSimpleName());
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345 Map<String, Object> properties = getDebugProperties();
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346 boolean hasProperties = false;
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347 for (Map.Entry<String, Object> entry : properties.entrySet()) {
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348 sb.append(hasProperties ? "," : "<");
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349 hasProperties = true;
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350 sb.append(entry.getKey()).append("=").append(entry.getValue());
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351 }
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352 if (hasProperties) {
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353 sb.append(">");
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354 }
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355 sb.append("@").append(Integer.toHexString(hashCode()));
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356 return sb.toString();
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357 }
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358 }