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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/Node.java @ 11279:494b818b527c

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Adding "Classpath" exception to the classes in the com.oracle.truffle.api and the com.oracle.truffle.api.dsl package.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Fri, 09 Aug 2013 11:55:20 +0200
parents 8c570011b86f
children 8f0fb0ade839
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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. 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
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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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 java.lang.annotation.*;
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28 import java.util.*;
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29
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30 import com.oracle.truffle.api.*;
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31 import com.oracle.truffle.api.nodes.NodeInfo.Kind;
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32
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33 /**
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34 * Abstract base class for all Truffle nodes.
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35 */
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36 public abstract class Node implements Cloneable {
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37
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38 private Node parent;
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39
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40 private SourceSection sourceSection;
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41
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42 /**
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43 * Marks array fields that are children of this node.
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44 */
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45 @Retention(RetentionPolicy.RUNTIME)
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46 @Target({ElementType.FIELD})
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47 public @interface Children {
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48 }
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49
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50 /**
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51 * Marks fields that represent child nodes of this node.
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52 */
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53 @Retention(RetentionPolicy.RUNTIME)
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54 @Target({ElementType.FIELD})
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55 public @interface Child {
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56 }
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57
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58 protected Node() {
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59 CompilerAsserts.neverPartOfCompilation();
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60 }
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61
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62 /**
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63 * Assigns a link to a guest language source section to this node.
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64 *
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65 * @param section the object representing a section in guest language source code
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66 */
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67 public final void assignSourceSection(SourceSection section) {
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68 if (sourceSection != null) {
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69 throw new IllegalStateException("Source section is already assigned.");
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70 }
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71 this.sourceSection = section;
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72 }
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74 /**
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75 * Clears any previously assigned guest language source code from this node.
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76 */
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77 public final void clearSourceSection() {
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78 this.sourceSection = null;
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79 }
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81 /**
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82 * Retrieves the guest language source code section that is currently assigned to this node.
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83 *
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84 * @return the assigned source code section
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85 */
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86 public final SourceSection getSourceSection() {
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87 return sourceSection;
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88 }
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89
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90 /**
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91 * Retrieves the guest language source code section that is currently assigned to this node.
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92 *
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93 * @return the assigned source code section
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94 */
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95 public final SourceSection getEncapsulatingSourceSection() {
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96 if (sourceSection == null && getParent() != null) {
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97 return getParent().getEncapsulatingSourceSection();
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98 }
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99 return sourceSection;
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100 }
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101
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102 /**
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103 * Method that updates the link to the parent in the array of specified new child nodes to this
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104 * node.
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105 *
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106 * @param newChildren the array of new children whose parent should be updated
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107 * @return the array of new children
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108 */
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109 protected final <T extends Node> T[] adoptChildren(T[] newChildren) {
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110 if (newChildren != null) {
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111 for (T n : newChildren) {
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112 adoptChild(n);
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113 }
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114 }
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115 return newChildren;
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116 }
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117
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118 /**
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119 * Method that updates the link to the parent in the specified new child node to this node.
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120 *
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121 * @param newChild the new child whose parent should be updated
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122 * @return the new child
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123 */
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124 protected final <T extends Node> T adoptChild(T newChild) {
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125 if (newChild != null) {
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126 if (newChild == this) {
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127 throw new IllegalStateException("The parent of a node can never be the node itself.");
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128 }
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129 ((Node) newChild).parent = this;
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130 }
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131 return newChild;
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132 }
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133
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134 /**
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135 * Returns properties of this node interesting for debugging and can be overwritten by
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136 * subclasses to add their own custom properties.
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137 *
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138 * @return the properties as a key/value hash map
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139 */
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140 public Map<String, Object> getDebugProperties() {
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141 Map<String, Object> properties = new HashMap<>();
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142 return properties;
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143 }
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144
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145 /**
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146 * The current parent node of this node.
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147 *
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148 * @return the parent node
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149 */
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150 public final Node getParent() {
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151 return parent;
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152 }
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153
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154 /**
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155 * Replaces this node with another node. If there is a source section (see
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156 * {@link #getSourceSection()}) associated with this node, it is transferred to the new node.
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157 *
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158 * @param newNode the new node that is the replacement
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159 * @param reason a description of the reason for the replacement
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160 * @return the new node
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161 */
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162 @SuppressWarnings({"unchecked"})
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163 public final <T extends Node> T replace(T newNode, String reason) {
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164 if (this.getParent() == null) {
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165 throw new IllegalStateException("This node cannot be replaced, because it does not yet have a parent.");
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166 }
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167 if (sourceSection != null) {
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168 // Pass on the source section to the new node.
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169 newNode.assignSourceSection(sourceSection);
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170 }
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171 onReplace(newNode, reason);
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172 return (T) this.getParent().replaceChild(this, newNode);
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173 }
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174
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175 private <T extends Node> T replaceChild(T oldChild, T newChild) {
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176 NodeUtil.replaceChild(this, oldChild, newChild);
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177 adoptChild(newChild);
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178 return newChild;
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179 }
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180
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181 /**
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182 * Replaces this node with another node. If there is a source section (see
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183 * {@link #getSourceSection()}) associated with this node, it is transferred to the new node.
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184 *
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185 * @param newNode the new node that is the replacement
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186 * @return the new node
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187 */
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188 public final <T extends Node> T replace(T newNode) {
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189 return replace(newNode, "");
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190 }
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191
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192 /**
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193 * Checks if this node is properly adopted by a parent and can be replaced.
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194 *
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195 * @return {@code true} if it is safe to replace this node.
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196 */
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197 public final boolean isReplaceable() {
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198 if (getParent() != null) {
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199 for (Node sibling : getParent().getChildren()) {
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200 if (sibling == this) {
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201 return true;
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202 }
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203 }
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204 }
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205 return false;
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206 }
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207
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208 /**
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209 * Intended to be implemented by subclasses of {@link Node} to receive a notification when the
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210 * node is rewritten. This method is invoked before the actual replace has happened.
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211 *
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212 * @param newNode the replacement node
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213 * @param reason the reason the replace supplied
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214 */
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215 protected void onReplace(Node newNode, String reason) {
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216 RootNode rootNode = NodeUtil.findParent(this, RootNode.class);
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217 if (rootNode != null) {
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218 if (rootNode.getCallTarget() instanceof ReplaceObserver) {
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219 ((ReplaceObserver) rootNode.getCallTarget()).nodeReplaced();
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220 }
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221 }
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222 if (TruffleOptions.TraceRewrites) {
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223 Class<? extends Node> from = getClass();
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224 Class<? extends Node> to = newNode.getClass();
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225
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226 if (TruffleOptions.TraceRewritesFilterFromKind != null) {
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227 if (filterByKind(from, TruffleOptions.TraceRewritesFilterFromKind)) {
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228 return;
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229 }
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230 }
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231
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232 if (TruffleOptions.TraceRewritesFilterToKind != null) {
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233 if (filterByKind(to, TruffleOptions.TraceRewritesFilterToKind)) {
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234 return;
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235 }
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236 }
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237
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238 String filter = TruffleOptions.TraceRewritesFilterClass;
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239 if (filter != null && (filterByContainsClassName(from, filter) || filterByContainsClassName(to, filter))) {
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240 return;
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241 }
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242
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243 // CheckStyle: stop system..print check
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244 System.out.printf("[truffle] rewrite %-50s |From %-40s |To %-40s |Reason %s.%n", this.toString(), formatNodeInfo(from), formatNodeInfo(to), reason);
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245 // CheckStyle: resume system..print check
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246 }
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247 }
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248
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249 private static String formatNodeInfo(Class<? extends Node> clazz) {
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250 NodeInfo nodeInfo = clazz.getAnnotation(NodeInfo.class);
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251 String kind = "?";
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252 if (nodeInfo != null) {
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253 switch (nodeInfo.kind()) {
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254 case GENERIC:
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255 kind = "G";
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256 break;
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257 case SPECIALIZED:
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258 kind = "S";
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259 break;
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260 case UNINITIALIZED:
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261 kind = "U";
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262 break;
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263 case POLYMORPHIC:
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264 kind = "P";
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265 break;
10590
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266 default:
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267 kind = "?";
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268 break;
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269 }
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270 }
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271 return kind + " " + clazz.getSimpleName();
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272 }
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273
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274 private static boolean filterByKind(Class<?> clazz, Kind kind) {
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275 NodeInfo info = clazz.getAnnotation(NodeInfo.class);
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276 if (info != null) {
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277 return info.kind() != kind;
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278 }
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279 return true;
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280 }
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281
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282 private static boolean filterByContainsClassName(Class<? extends Node> from, String filter) {
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283 Class<?> currentFrom = from;
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diff changeset
284 while (currentFrom != null) {
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285 if (currentFrom.getName().contains(filter)) {
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286 return false;
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287 }
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288 currentFrom = currentFrom.getSuperclass();
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289 }
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diff changeset
290 return true;
9782
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291 }
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292
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diff changeset
293 /**
7530
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294 * Invokes the {@link NodeVisitor#visit(Node)} method for this node and recursively also for all
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diff changeset
295 * child nodes.
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diff changeset
296 *
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297 * @param nodeVisitor the visitor
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298 */
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299 public final void accept(NodeVisitor nodeVisitor) {
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300 if (nodeVisitor.visit(this)) {
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301 for (Node child : this.getChildren()) {
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302 if (child != null) {
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303 child.accept(nodeVisitor);
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304 }
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305 }
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306 }
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307 }
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308
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309 /**
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310 * Iterator over the children of this node.
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311 *
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312 * @return the iterator
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313 */
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314 public final Iterable<Node> getChildren() {
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315 final Node node = this;
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316 return new Iterable<Node>() {
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317
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318 public Iterator<Node> iterator() {
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319 return new NodeUtil.NodeIterator(node);
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320 }
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321 };
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322 }
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323
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324 /**
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325 * Creates a shallow copy of this node.
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326 *
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327 * @return the new copy
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328 */
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329 public Node copy() {
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330 try {
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331 return (Node) super.clone();
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332 } catch (CloneNotSupportedException e) {
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333 return null;
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334 }
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335 }
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336
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337 /**
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338 * This method must never be called. It enforces that {@link Object#clone} is not directly
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339 * called by subclasses. Use the {@link #copy()} method instead.
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340 */
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341 @Override
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342 @Deprecated
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343 protected final Object clone() throws CloneNotSupportedException {
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344 throw new IllegalStateException("This method should never be called, use the copy method instead!");
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345 }
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346
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347 /**
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348 * Converts this node to a textual representation useful for debugging.
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349 */
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350 @Override
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351 public String toString() {
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352 StringBuilder sb = new StringBuilder(getClass().getSimpleName());
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353 Map<String, Object> properties = getDebugProperties();
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354 boolean hasProperties = false;
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355 for (Map.Entry<String, Object> entry : properties.entrySet()) {
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356 sb.append(hasProperties ? "," : "<");
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357 hasProperties = true;
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358 sb.append(entry.getKey()).append("=").append(entry.getValue());
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359 }
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360 if (hasProperties) {
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361 sb.append(">");
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362 }
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363 sb.append("@").append(Integer.toHexString(hashCode()));
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364 return sb.toString();
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365 }
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366 }