Mercurial > hg > truffle
annotate graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/parser/SLNodeFactory.java @ 16958:997899955e72
Instrumentation: removed ExecutionContext parameter from probe method in Instrumentable
SL/Instrumentation: SLRootNode's now store SLContext. New method added to SLStatementNode to find the root node and get its SLContext
author | David Piorkowski <david.piorkowski@oracle.com> |
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date | Tue, 26 Aug 2014 11:00:30 -0700 |
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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 * 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.sl.parser; |
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24 |
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25 import java.math.*; |
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26 import java.util.*; |
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27 |
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28 import com.oracle.truffle.api.frame.*; |
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29 import com.oracle.truffle.api.nodes.*; |
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30 import com.oracle.truffle.api.source.*; |
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31 import com.oracle.truffle.sl.nodes.*; |
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32 import com.oracle.truffle.sl.nodes.call.*; |
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33 import com.oracle.truffle.sl.nodes.controlflow.*; |
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34 import com.oracle.truffle.sl.nodes.expression.*; |
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35 import com.oracle.truffle.sl.nodes.local.*; |
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36 import com.oracle.truffle.sl.runtime.*; |
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37 |
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38 /** |
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39 * Helper class used by the SL {@link Parser} to create nodes. The code is factored out of the |
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40 * automatically generated parser to keep the attributed grammar of SL small. |
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41 */ |
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42 public class SLNodeFactory { |
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43 |
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44 /** |
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45 * Local variable names that are visible in the current block. Variables are not visible outside |
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46 * of their defining block, to prevent the usage of undefined variables. Because of that, we can |
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47 * decide during parsing if a name references a local variable or is a function name. |
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48 */ |
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49 static class LexicalScope { |
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50 protected final LexicalScope outer; |
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51 protected final Map<String, FrameSlot> locals; |
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52 |
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53 public LexicalScope(LexicalScope outer) { |
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54 this.outer = outer; |
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55 this.locals = new HashMap<>(); |
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56 if (outer != null) { |
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57 locals.putAll(outer.locals); |
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58 } |
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59 } |
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60 } |
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61 |
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62 /* State while parsing a source unit. */ |
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63 private final SLContext context; |
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64 private final Source source; |
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65 |
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66 /* State while parsing a function. */ |
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67 private int functionStartPos; |
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68 private String functionName; |
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69 private int functionBodyStartPos; // includes parameter list |
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70 private int parameterCount; |
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71 private FrameDescriptor frameDescriptor; |
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72 private List<SLStatementNode> methodNodes; |
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73 |
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74 /* State while parsing a block. */ |
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75 private LexicalScope lexicalScope; |
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76 |
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77 public SLNodeFactory(SLContext context, Source source) { |
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78 this.context = context; |
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79 this.source = source; |
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80 } |
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81 |
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82 public void startFunction(Token nameToken, int bodyStartPos) { |
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83 assert functionStartPos == 0; |
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84 assert functionName == null; |
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85 assert functionBodyStartPos == 0; |
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86 assert parameterCount == 0; |
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87 assert frameDescriptor == null; |
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88 assert lexicalScope == null; |
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89 |
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90 functionStartPos = nameToken.charPos; |
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91 functionName = nameToken.val; |
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92 functionBodyStartPos = bodyStartPos; |
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93 frameDescriptor = new FrameDescriptor(); |
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94 methodNodes = new ArrayList<>(); |
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95 startBlock(); |
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96 } |
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97 |
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98 public void addFormalParameter(Token nameToken) { |
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99 /* |
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100 * Method parameters are assigned to local variables at the beginning of the method. This |
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101 * ensures that accesses to parameters are specialized the same way as local variables are |
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102 * specialized. |
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103 */ |
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104 final SourceSection src = srcFromToken(nameToken); |
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105 final SLReadArgumentNode readArg = new SLReadArgumentNode(src, parameterCount); |
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106 methodNodes.add(createAssignment(nameToken, readArg)); |
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107 parameterCount++; |
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108 } |
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109 |
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110 public void finishFunction(SLStatementNode bodyNode) { |
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111 methodNodes.add(bodyNode); |
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112 final int bodyEndPos = bodyNode.getSourceSection().getCharEndIndex(); |
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113 final SourceSection functionSrc = source.createSection(functionName, functionStartPos, bodyEndPos - functionStartPos); |
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114 final SLStatementNode methodBlock = finishBlock(methodNodes, functionBodyStartPos, bodyEndPos - functionBodyStartPos); |
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115 assert lexicalScope == null : "Wrong scoping of blocks in parser"; |
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116 |
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117 final SLFunctionBodyNode functionBodyNode = new SLFunctionBodyNode(functionSrc, methodBlock); |
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118 final SLRootNode rootNode = new SLRootNode(this.context, frameDescriptor, functionBodyNode, functionName); |
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119 |
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120 context.getFunctionRegistry().register(functionName, rootNode); |
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121 |
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122 functionStartPos = 0; |
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123 functionName = null; |
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124 functionBodyStartPos = 0; |
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125 parameterCount = 0; |
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126 frameDescriptor = null; |
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127 lexicalScope = null; |
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128 } |
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129 |
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130 public void startBlock() { |
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131 lexicalScope = new LexicalScope(lexicalScope); |
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132 } |
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133 |
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134 public SLStatementNode finishBlock(List<SLStatementNode> bodyNodes, int startPos, int length) { |
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135 lexicalScope = lexicalScope.outer; |
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136 |
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137 List<SLStatementNode> flattenedNodes = new ArrayList<>(bodyNodes.size()); |
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138 flattenBlocks(bodyNodes, flattenedNodes); |
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139 |
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140 final SourceSection src = source.createSection("block", startPos, length); |
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141 return new SLBlockNode(src, flattenedNodes.toArray(new SLStatementNode[flattenedNodes.size()])); |
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142 } |
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143 |
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144 private void flattenBlocks(Iterable<? extends Node> bodyNodes, List<SLStatementNode> flattenedNodes) { |
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145 for (Node n : bodyNodes) { |
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146 if (n instanceof SLBlockNode) { |
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147 flattenBlocks(n.getChildren(), flattenedNodes); |
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148 } else { |
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149 flattenedNodes.add((SLStatementNode) n); |
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150 } |
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151 } |
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152 } |
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153 |
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154 /** |
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155 * Returns an {@link SLBreakNode} for the given token. |
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156 * |
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157 * @param breakToken The token containing the break node's info. |
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158 * @return A SLBreakNode for the given token. |
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159 */ |
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160 public SLStatementNode createBreak(Token breakToken) { |
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161 final SLBreakNode breakNode = new SLBreakNode(srcFromToken(breakToken)); |
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162 return breakNode; |
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163 } |
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164 |
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165 /** |
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166 * Returns an {@link SLContinueNode} for the given token. |
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167 * |
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168 * @param continueToken The token containing the continue node's info. |
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169 * @return A SLContinueNode built using the given token. |
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170 */ |
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171 public SLStatementNode createContinue(Token continueToken) { |
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172 final SLContinueNode continueNode = new SLContinueNode(srcFromToken(continueToken)); |
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173 return continueNode; |
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174 } |
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175 |
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176 /** |
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177 * Returns an {@link SLWhileNode} for the given parameters. |
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178 * |
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179 * @param whileToken The token containing the while node's info |
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180 * @param conditionNode The conditional node for this while loop |
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181 * @param bodyNode The body of the while loop |
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182 * @return A SLWhileNode built using the given parameters. |
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183 */ |
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184 public SLStatementNode createWhile(Token whileToken, SLExpressionNode conditionNode, SLStatementNode bodyNode) { |
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185 final int start = whileToken.charPos; |
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186 final int end = bodyNode.getSourceSection().getCharEndIndex(); |
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187 final SLWhileNode whileNode = new SLWhileNode(source.createSection(whileToken.val, start, end - start), conditionNode, bodyNode); |
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188 return whileNode; |
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189 } |
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190 |
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191 /** |
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192 * Returns an {@link SLIfNode} for the given parameters. |
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193 * |
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194 * @param ifToken The token containing the if node's info |
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195 * @param conditionNode The condition node of this if statement |
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196 * @param thenPartNode The then part of the if |
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197 * @param elsePartNode The else part of the if |
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198 * @return An SLIfNode for the given parameters. |
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199 */ |
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200 public SLStatementNode createIf(Token ifToken, SLExpressionNode conditionNode, SLStatementNode thenPartNode, SLStatementNode elsePartNode) { |
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201 final int start = ifToken.charPos; |
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202 final int end = elsePartNode == null ? thenPartNode.getSourceSection().getCharEndIndex() : elsePartNode.getSourceSection().getCharEndIndex(); |
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203 final SLIfNode ifNode = new SLIfNode(source.createSection(ifToken.val, start, end - start), conditionNode, thenPartNode, elsePartNode); |
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204 return ifNode; |
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205 } |
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206 |
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207 /** |
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208 * Returns an {@link SLReturnNode} for the given parameters. |
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209 * |
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210 * @param t The token containing the return node's info |
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211 * @param valueNode The value of the return |
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212 * @return An SLReturnNode for the given parameters. |
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213 */ |
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214 public SLStatementNode createReturn(Token t, SLExpressionNode valueNode) { |
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215 final int start = t.charPos; |
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216 final int length = valueNode == null ? t.val.length() : valueNode.getSourceSection().getCharEndIndex() - start; |
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217 final SLReturnNode returnNode = new SLReturnNode(source.createSection(t.val, start, length), valueNode); |
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218 return returnNode; |
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219 } |
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220 |
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221 /** |
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222 * Returns the corresponding subclass of {@link SLExpressionNode} for binary expressions. |
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223 * </br>These nodes are currently not instrumented. |
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224 * |
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225 * @param opToken The operator of the binary expression |
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226 * @param leftNode The left node of the expression |
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227 * @param rightNode The right node of the expression |
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228 * @return A subclass of SLExpressionNode using the given parameters based on the given opToken. |
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229 */ |
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230 public SLExpressionNode createBinary(Token opToken, SLExpressionNode leftNode, SLExpressionNode rightNode) { |
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231 int start = leftNode.getSourceSection().getCharIndex(); |
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232 int length = rightNode.getSourceSection().getCharEndIndex() - start; |
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233 final SourceSection src = source.createSection(opToken.val, start, length); |
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234 switch (opToken.val) { |
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235 case "+": |
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236 return SLAddNodeFactory.create(src, leftNode, rightNode); |
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237 case "*": |
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238 return SLMulNodeFactory.create(src, leftNode, rightNode); |
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239 case "/": |
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240 return SLDivNodeFactory.create(src, leftNode, rightNode); |
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241 case "-": |
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242 return SLSubNodeFactory.create(src, leftNode, rightNode); |
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243 case "<": |
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244 return SLLessThanNodeFactory.create(src, leftNode, rightNode); |
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245 case "<=": |
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246 return SLLessOrEqualNodeFactory.create(src, leftNode, rightNode); |
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247 case ">": |
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248 return SLLogicalNotNodeFactory.create(src, SLLessOrEqualNodeFactory.create(null, leftNode, rightNode)); |
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249 case ">=": |
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250 return SLLogicalNotNodeFactory.create(src, SLLessThanNodeFactory.create(null, leftNode, rightNode)); |
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251 case "==": |
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252 return SLEqualNodeFactory.create(src, leftNode, rightNode); |
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253 case "!=": |
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254 return SLLogicalNotNodeFactory.create(src, SLEqualNodeFactory.create(null, leftNode, rightNode)); |
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255 case "&&": |
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256 return SLLogicalAndNodeFactory.create(src, leftNode, rightNode); |
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257 case "||": |
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258 return SLLogicalOrNodeFactory.create(src, leftNode, rightNode); |
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259 default: |
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260 throw new RuntimeException("unexpected operation: " + opToken.val); |
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261 } |
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262 } |
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263 |
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264 /** |
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265 * Returns an {@link SLInvokeNode} for the given parameters. |
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266 * |
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267 * @param nameToken The name of the function being called |
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268 * @param parameterNodes The parameters of the function call |
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269 * @param finalToken A token used to determine the end of the sourceSelection for this call |
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270 * @return An SLInvokeNode for the given parameters. |
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271 */ |
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272 public SLExpressionNode createCall(Token nameToken, List<SLExpressionNode> parameterNodes, Token finalToken) { |
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273 final int startPos = nameToken.charPos; |
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274 final int endPos = finalToken.charPos + finalToken.val.length(); |
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275 final SourceSection src = source.createSection(nameToken.val, startPos, endPos - startPos); |
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276 SLExpressionNode functionNode = createRead(nameToken); |
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277 return SLInvokeNode.create(src, functionNode, parameterNodes.toArray(new SLExpressionNode[parameterNodes.size()])); |
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278 } |
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279 |
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280 /** |
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281 * Returns an {@link SLWriteLocalVariableNode} for the given parameters. |
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282 * |
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283 * @param nameToken The name of the variable being assigned |
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284 * @param valueNode The value to be assigned |
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285 * @return An SLExpressionNode for the given parameters. |
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286 */ |
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287 public SLExpressionNode createAssignment(Token nameToken, SLExpressionNode valueNode) { |
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288 FrameSlot frameSlot = frameDescriptor.findOrAddFrameSlot(nameToken.val); |
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289 lexicalScope.locals.put(nameToken.val, frameSlot); |
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290 final int start = nameToken.charPos; |
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291 final int length = valueNode.getSourceSection().getCharEndIndex() - start; |
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292 return SLWriteLocalVariableNodeFactory.create(source.createSection("=", start, length), valueNode, frameSlot); |
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293 } |
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294 |
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295 /** |
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296 * Returns a {@link SLReadLocalVariableNode} if this read is a local variable or a |
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297 * {@link SLFunctionLiteralNode} if this read is global. In Simple, the only global names are |
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298 * functions. </br> There is currently no instrumentation for this node. |
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299 * |
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300 * @param nameToken The name of the variable/function being read |
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301 * @return either: |
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302 * <ul> |
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303 * <li>A SLReadLocalVariableNode representing the local variable being read.</li> |
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304 * <li>A SLFunctionLiteralNode representing the function definition</li> |
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305 * </ul> |
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306 */ |
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307 public SLExpressionNode createRead(Token nameToken) { |
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308 final FrameSlot frameSlot = lexicalScope.locals.get(nameToken.val); |
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309 final SourceSection src = srcFromToken(nameToken); |
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310 if (frameSlot != null) { |
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311 /* Read of a local variable. */ |
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312 return SLReadLocalVariableNodeFactory.create(src, frameSlot); |
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313 } else { |
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314 /* Read of a global name. In our language, the only global names are functions. */ |
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315 return new SLFunctionLiteralNode(src, context.getFunctionRegistry().lookup(nameToken.val)); |
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316 } |
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317 } |
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318 |
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319 public SLExpressionNode createStringLiteral(Token literalToken) { |
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320 /* Remove the trailing and ending " */ |
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321 String literal = literalToken.val; |
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322 assert literal.length() >= 2 && literal.startsWith("\"") && literal.endsWith("\""); |
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323 final SourceSection src = srcFromToken(literalToken); |
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324 literal = literal.substring(1, literal.length() - 1); |
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325 |
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326 return new SLStringLiteralNode(src, literal); |
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327 } |
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328 |
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329 public SLExpressionNode createNumericLiteral(Token literalToken) { |
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330 final SourceSection src = srcFromToken(literalToken); |
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331 try { |
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332 /* Try if the literal is small enough to fit into a long value. */ |
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333 return new SLLongLiteralNode(src, Long.parseLong(literalToken.val)); |
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334 } catch (NumberFormatException ex) { |
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335 /* Overflow of long value, so fall back to BigInteger. */ |
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336 return new SLBigIntegerLiteralNode(src, new BigInteger(literalToken.val)); |
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337 } |
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338 } |
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339 |
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340 public SLExpressionNode createParenExpression(SLExpressionNode expressionNode, int start, int length) { |
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341 final SourceSection src = source.createSection("()", start, length); |
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342 return new SLParenExpressionNode(src, expressionNode); |
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343 } |
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344 |
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345 /** |
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346 * Creates source description of a single token. |
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347 */ |
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348 private SourceSection srcFromToken(Token token) { |
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349 return source.createSection(token.val, token.charPos, token.val.length()); |
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350 } |
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351 |
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352 } |