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annotate truffle/com.oracle.truffle.sl/src/com/oracle/truffle/sl/parser/SLNodeFactory.java @ 22065:503529c65456

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Remove trailing whitespace from UPL license
author Tom Rodriguez <tom.rodriguez@oracle.com>
date Wed, 05 Aug 2015 10:19:41 -0700
parents e7c2d36daf72
children dc83cc1f94f2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2012, 2014, 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 * The Universal Permissive License (UPL), Version 1.0
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6 *
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7 * Subject to the condition set forth below, permission is hereby granted to any
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8 * person obtaining a copy of this software, associated documentation and/or
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9 * data (collectively the "Software"), free of charge and under any and all
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10 * copyright rights in the Software, and any and all patent rights owned or
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11 * freely licensable by each licensor hereunder covering either (i) the
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12 * unmodified Software as contributed to or provided by such licensor, or (ii)
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13 * the Larger Works (as defined below), to deal in both
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14 *
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15 * (a) the Software, and
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16 *
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17 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
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18 * one is included with the Software each a "Larger Work" to which the Software
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19 * is contributed by such licensors),
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20 *
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21 * without restriction, including without limitation the rights to copy, create
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22 * derivative works of, display, perform, and distribute the Software and make,
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23 * use, sell, offer for sale, import, export, have made, and have sold the
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24 * Software and the Larger Work(s), and to sublicense the foregoing rights on
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25 * either these or other terms.
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26 *
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27 * This license is subject to the following condition:
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28 *
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29 * The above copyright notice and either this complete permission notice or at a
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30 * minimum a reference to the UPL must be included in all copies or substantial
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31 * portions of the Software.
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32 *
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33 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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34 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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35 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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36 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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37 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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38 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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39 * SOFTWARE.
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40 */
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41 package com.oracle.truffle.sl.parser;
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42
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43 import java.math.*;
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44 import java.util.*;
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45
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46 import com.oracle.truffle.api.frame.*;
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47 import com.oracle.truffle.api.nodes.*;
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48 import com.oracle.truffle.api.source.*;
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49 import com.oracle.truffle.sl.nodes.*;
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50 import com.oracle.truffle.sl.nodes.access.*;
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51 import com.oracle.truffle.sl.nodes.call.*;
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52 import com.oracle.truffle.sl.nodes.controlflow.*;
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53 import com.oracle.truffle.sl.nodes.expression.*;
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54 import com.oracle.truffle.sl.nodes.local.*;
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55 import com.oracle.truffle.sl.runtime.*;
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56
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57 /**
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58 * Helper class used by the SL {@link Parser} to create nodes. The code is factored out of the
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59 * automatically generated parser to keep the attributed grammar of SL small.
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60 */
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61 public class SLNodeFactory {
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62
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63 /**
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64 * Local variable names that are visible in the current block. Variables are not visible outside
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65 * of their defining block, to prevent the usage of undefined variables. Because of that, we can
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66 * decide during parsing if a name references a local variable or is a function name.
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67 */
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68 static class LexicalScope {
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69 protected final LexicalScope outer;
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70 protected final Map<String, FrameSlot> locals;
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71
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72 public LexicalScope(LexicalScope outer) {
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73 this.outer = outer;
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74 this.locals = new HashMap<>();
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75 if (outer != null) {
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76 locals.putAll(outer.locals);
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77 }
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78 }
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79 }
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80
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81 /* State while parsing a source unit. */
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82 private final SLContext context;
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83 private final Source source;
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84
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85 /* State while parsing a function. */
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86 private int functionStartPos;
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87 private String functionName;
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88 private int functionBodyStartPos; // includes parameter list
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89 private int parameterCount;
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90 private FrameDescriptor frameDescriptor;
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91 private List<SLStatementNode> methodNodes;
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92
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93 /* State while parsing a block. */
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94 private LexicalScope lexicalScope;
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95
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96 public SLNodeFactory(SLContext context, Source source) {
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97 this.context = context;
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98 this.source = source;
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99 }
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100
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101 public void startFunction(Token nameToken, int bodyStartPos) {
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102 assert functionStartPos == 0;
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103 assert functionName == null;
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104 assert functionBodyStartPos == 0;
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105 assert parameterCount == 0;
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106 assert frameDescriptor == null;
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107 assert lexicalScope == null;
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108
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109 functionStartPos = nameToken.charPos;
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110 functionName = nameToken.val;
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111 functionBodyStartPos = bodyStartPos;
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112 frameDescriptor = new FrameDescriptor();
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113 methodNodes = new ArrayList<>();
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114 startBlock();
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115 }
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116
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117 public void addFormalParameter(Token nameToken) {
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118 /*
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119 * Method parameters are assigned to local variables at the beginning of the method. This
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120 * ensures that accesses to parameters are specialized the same way as local variables are
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121 * specialized.
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122 */
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123 final SourceSection src = srcFromToken(nameToken);
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124 final SLReadArgumentNode readArg = new SLReadArgumentNode(src, parameterCount);
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125 methodNodes.add(createAssignment(nameToken, readArg));
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126 parameterCount++;
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127 }
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128
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129 public void finishFunction(SLStatementNode bodyNode) {
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130 methodNodes.add(bodyNode);
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131 final int bodyEndPos = bodyNode.getSourceSection().getCharEndIndex();
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132 final SourceSection functionSrc = source.createSection(functionName, functionStartPos, bodyEndPos - functionStartPos);
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133 final SLStatementNode methodBlock = finishBlock(methodNodes, functionBodyStartPos, bodyEndPos - functionBodyStartPos);
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134 assert lexicalScope == null : "Wrong scoping of blocks in parser";
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135
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136 final SLFunctionBodyNode functionBodyNode = new SLFunctionBodyNode(functionSrc, methodBlock);
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137 final SLRootNode rootNode = new SLRootNode(this.context, frameDescriptor, functionBodyNode, functionName);
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138 rootNode.assignSourceSection(functionSrc);
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139
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140 context.getFunctionRegistry().register(functionName, rootNode);
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141
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142 functionStartPos = 0;
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143 functionName = null;
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144 functionBodyStartPos = 0;
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145 parameterCount = 0;
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146 frameDescriptor = null;
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147 lexicalScope = null;
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148 }
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149
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150 public void startBlock() {
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151 lexicalScope = new LexicalScope(lexicalScope);
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152 }
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153
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154 public SLStatementNode finishBlock(List<SLStatementNode> bodyNodes, int startPos, int length) {
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155 lexicalScope = lexicalScope.outer;
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156
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157 List<SLStatementNode> flattenedNodes = new ArrayList<>(bodyNodes.size());
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158 flattenBlocks(bodyNodes, flattenedNodes);
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159
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160 final SourceSection src = source.createSection("block", startPos, length);
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161 return new SLBlockNode(src, flattenedNodes.toArray(new SLStatementNode[flattenedNodes.size()]));
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162 }
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163
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164 private void flattenBlocks(Iterable<? extends Node> bodyNodes, List<SLStatementNode> flattenedNodes) {
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165 for (Node n : bodyNodes) {
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166 if (n instanceof SLBlockNode) {
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167 flattenBlocks(n.getChildren(), flattenedNodes);
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168 } else {
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169 flattenedNodes.add((SLStatementNode) n);
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170 }
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171 }
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172 }
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173
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174 /**
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175 * Returns an {@link SLBreakNode} for the given token.
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176 *
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177 * @param breakToken The token containing the break node's info.
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178 * @return A SLBreakNode for the given token.
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179 */
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180 public SLStatementNode createBreak(Token breakToken) {
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181 final SLBreakNode breakNode = new SLBreakNode(srcFromToken(breakToken));
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182 return breakNode;
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183 }
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184
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185 /**
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186 * Returns an {@link SLContinueNode} for the given token.
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187 *
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188 * @param continueToken The token containing the continue node's info.
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189 * @return A SLContinueNode built using the given token.
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190 */
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191 public SLStatementNode createContinue(Token continueToken) {
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192 final SLContinueNode continueNode = new SLContinueNode(srcFromToken(continueToken));
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193 return continueNode;
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194 }
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195
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196 /**
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197 * Returns an {@link SLWhileNode} for the given parameters.
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198 *
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199 * @param whileToken The token containing the while node's info
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200 * @param conditionNode The conditional node for this while loop
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201 * @param bodyNode The body of the while loop
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202 * @return A SLWhileNode built using the given parameters.
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203 */
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204 public SLStatementNode createWhile(Token whileToken, SLExpressionNode conditionNode, SLStatementNode bodyNode) {
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205 final int start = whileToken.charPos;
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206 final int end = bodyNode.getSourceSection().getCharEndIndex();
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207 final SLWhileNode whileNode = new SLWhileNode(source.createSection(whileToken.val, start, end - start), conditionNode, bodyNode);
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208 return whileNode;
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209 }
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210
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211 /**
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212 * Returns an {@link SLIfNode} for the given parameters.
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213 *
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214 * @param ifToken The token containing the if node's info
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215 * @param conditionNode The condition node of this if statement
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216 * @param thenPartNode The then part of the if
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217 * @param elsePartNode The else part of the if
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218 * @return An SLIfNode for the given parameters.
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219 */
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220 public SLStatementNode createIf(Token ifToken, SLExpressionNode conditionNode, SLStatementNode thenPartNode, SLStatementNode elsePartNode) {
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221 final int start = ifToken.charPos;
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222 final int end = elsePartNode == null ? thenPartNode.getSourceSection().getCharEndIndex() : elsePartNode.getSourceSection().getCharEndIndex();
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223 final SLIfNode ifNode = new SLIfNode(source.createSection(ifToken.val, start, end - start), conditionNode, thenPartNode, elsePartNode);
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224 return ifNode;
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225 }
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226
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227 /**
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228 * Returns an {@link SLReturnNode} for the given parameters.
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229 *
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230 * @param t The token containing the return node's info
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231 * @param valueNode The value of the return
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232 * @return An SLReturnNode for the given parameters.
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233 */
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234 public SLStatementNode createReturn(Token t, SLExpressionNode valueNode) {
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235 final int start = t.charPos;
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236 final int length = valueNode == null ? t.val.length() : valueNode.getSourceSection().getCharEndIndex() - start;
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237 final SLReturnNode returnNode = new SLReturnNode(source.createSection(t.val, start, length), valueNode);
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238 return returnNode;
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239 }
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240
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241 /**
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242 * Returns the corresponding subclass of {@link SLExpressionNode} for binary expressions. </br>
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243 * These nodes are currently not instrumented.
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244 *
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245 * @param opToken The operator of the binary expression
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246 * @param leftNode The left node of the expression
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247 * @param rightNode The right node of the expression
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248 * @return A subclass of SLExpressionNode using the given parameters based on the given opToken.
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249 */
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250 public SLExpressionNode createBinary(Token opToken, SLExpressionNode leftNode, SLExpressionNode rightNode) {
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251 int start = leftNode.getSourceSection().getCharIndex();
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252 int length = rightNode.getSourceSection().getCharEndIndex() - start;
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253 final SourceSection src = source.createSection(opToken.val, start, length);
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254 switch (opToken.val) {
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255 case "+":
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256 return SLAddNodeGen.create(src, leftNode, rightNode);
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257 case "*":
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258 return SLMulNodeGen.create(src, leftNode, rightNode);
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259 case "/":
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260 return SLDivNodeGen.create(src, leftNode, rightNode);
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261 case "-":
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262 return SLSubNodeGen.create(src, leftNode, rightNode);
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263 case "<":
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264 return SLLessThanNodeGen.create(src, leftNode, rightNode);
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265 case "<=":
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266 return SLLessOrEqualNodeGen.create(src, leftNode, rightNode);
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267 case ">":
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268 return SLLogicalNotNodeGen.create(src, SLLessOrEqualNodeGen.create(null, leftNode, rightNode));
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269 case ">=":
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270 return SLLogicalNotNodeGen.create(src, SLLessThanNodeGen.create(null, leftNode, rightNode));
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271 case "==":
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272 return SLEqualNodeGen.create(src, leftNode, rightNode);
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273 case "!=":
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274 return SLLogicalNotNodeGen.create(src, SLEqualNodeGen.create(null, leftNode, rightNode));
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275 case "&&":
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276 return SLLogicalAndNodeGen.create(src, leftNode, rightNode);
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277 case "||":
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278 return SLLogicalOrNodeGen.create(src, leftNode, rightNode);
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279 default:
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280 throw new RuntimeException("unexpected operation: " + opToken.val);
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281 }
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282 }
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283
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284 /**
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285 * Returns an {@link SLInvokeNode} for the given parameters.
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286 *
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287 * @param functionNode The function being called
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288 * @param parameterNodes The parameters of the function call
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289 * @param finalToken A token used to determine the end of the sourceSelection for this call
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290 * @return An SLInvokeNode for the given parameters.
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291 */
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292 public SLExpressionNode createCall(SLExpressionNode functionNode, List<SLExpressionNode> parameterNodes, Token finalToken) {
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293 final int startPos = functionNode.getSourceSection().getCharIndex();
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294 final int endPos = finalToken.charPos + finalToken.val.length();
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295 final SourceSection src = source.createSection(functionNode.getSourceSection().getIdentifier(), startPos, endPos - startPos);
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296 return SLInvokeNodeGen.create(src, parameterNodes.toArray(new SLExpressionNode[parameterNodes.size()]), functionNode);
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297 }
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298
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299 /**
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300 * Returns an {@link SLWriteLocalVariableNode} for the given parameters.
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301 *
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302 * @param nameToken The name of the variable being assigned
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303 * @param valueNode The value to be assigned
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304 * @return An SLExpressionNode for the given parameters.
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305 */
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306 public SLExpressionNode createAssignment(Token nameToken, SLExpressionNode valueNode) {
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307 FrameSlot frameSlot = frameDescriptor.findOrAddFrameSlot(nameToken.val);
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308 lexicalScope.locals.put(nameToken.val, frameSlot);
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309 final int start = nameToken.charPos;
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310 final int length = valueNode.getSourceSection().getCharEndIndex() - start;
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311 return SLWriteLocalVariableNodeGen.create(source.createSection("=", start, length), valueNode, frameSlot);
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312 }
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313
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314 /**
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315 * Returns a {@link SLReadLocalVariableNode} if this read is a local variable or a
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316 * {@link SLFunctionLiteralNode} if this read is global. In Simple, the only global names are
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317 * functions. </br> There is currently no instrumentation for this node.
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318 *
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319 * @param nameToken The name of the variable/function being read
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320 * @return either:
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321 * <ul>
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322 * <li>A SLReadLocalVariableNode representing the local variable being read.</li>
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323 * <li>A SLFunctionLiteralNode representing the function definition</li>
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324 * </ul>
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325 */
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326 public SLExpressionNode createRead(Token nameToken) {
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327 final FrameSlot frameSlot = lexicalScope.locals.get(nameToken.val);
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328 final SourceSection src = srcFromToken(nameToken);
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329 if (frameSlot != null) {
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330 /* Read of a local variable. */
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331 return SLReadLocalVariableNodeGen.create(src, frameSlot);
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332 } else {
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333 /* Read of a global name. In our language, the only global names are functions. */
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334 return new SLFunctionLiteralNode(src, nameToken.val);
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335 }
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336 }
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337
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338 public SLExpressionNode createStringLiteral(Token literalToken) {
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339 /* Remove the trailing and ending " */
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340 String literal = literalToken.val;
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341 assert literal.length() >= 2 && literal.startsWith("\"") && literal.endsWith("\"");
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342 final SourceSection src = srcFromToken(literalToken);
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343 literal = literal.substring(1, literal.length() - 1);
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344
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345 return new SLStringLiteralNode(src, literal);
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346 }
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347
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348 public SLExpressionNode createNumericLiteral(Token literalToken) {
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349 final SourceSection src = srcFromToken(literalToken);
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350 try {
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351 /* Try if the literal is small enough to fit into a long value. */
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352 return new SLLongLiteralNode(src, Long.parseLong(literalToken.val));
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353 } catch (NumberFormatException ex) {
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354 /* Overflow of long value, so fall back to BigInteger. */
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355 return new SLBigIntegerLiteralNode(src, new BigInteger(literalToken.val));
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356 }
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357 }
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358
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diff changeset
359 public SLExpressionNode createParenExpression(SLExpressionNode expressionNode, int start, int length) {
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360 final SourceSection src = source.createSection("()", start, length);
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361 return new SLParenExpressionNode(src, expressionNode);
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362 }
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363
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diff changeset
364 /**
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365 * Returns an {@link SLReadPropertyNode} for the given parameters.
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366 *
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367 * @param receiverNode The receiver of the property access
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368 * @param nameToken The name of the property being accessed
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369 * @return An SLExpressionNode for the given parameters.
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370 */
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371 public SLExpressionNode createReadProperty(SLExpressionNode receiverNode, Token nameToken) {
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372 final int startPos = receiverNode.getSourceSection().getCharIndex();
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373 final int endPos = nameToken.charPos + nameToken.val.length();
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374 final SourceSection src = source.createSection(".", startPos, endPos - startPos);
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375 return SLReadPropertyNode.create(src, receiverNode, nameToken.val);
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376 }
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377
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378 /**
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379 * Returns an {@link SLWritePropertyNode} for the given parameters.
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380 *
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381 * @param receiverNode The receiver object of the property assignment
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382 * @param nameToken The name of the property being assigned
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383 * @param valueNode The value to be assigned
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384 * @return An SLExpressionNode for the given parameters.
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385 */
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386 public SLExpressionNode createWriteProperty(SLExpressionNode receiverNode, Token nameToken, SLExpressionNode valueNode) {
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387 final int start = receiverNode.getSourceSection().getCharIndex();
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388 final int length = valueNode.getSourceSection().getCharEndIndex() - start;
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389 SourceSection src = source.createSection("=", start, length);
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390 return SLWritePropertyNode.create(src, receiverNode, nameToken.val, valueNode);
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391 }
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392
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393 /**
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394 * Creates source description of a single token.
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395 */
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396 private SourceSection srcFromToken(Token token) {
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397 return source.createSection(token.val, token.charPos, token.val.length());
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398 }
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399
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400 }