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annotate graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/parser/SLNodeFactory.java @ 17443:90c6a996f9cd

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Truffle: add new callFunctionsWith builtin for SL Truffle tests.
author Christian Humer <christian.humer@gmail.com>
date Tue, 14 Oct 2014 20:02:44 +0200
parents 997899955e72
children dc2e000bed40
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 * 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 rootNode.assignSourceSection(functionSrc);
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120
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121 context.getFunctionRegistry().register(functionName, rootNode);
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122
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123 functionStartPos = 0;
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124 functionName = null;
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125 functionBodyStartPos = 0;
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126 parameterCount = 0;
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127 frameDescriptor = null;
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128 lexicalScope = null;
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129 }
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130
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131 public void startBlock() {
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132 lexicalScope = new LexicalScope(lexicalScope);
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133 }
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134
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135 public SLStatementNode finishBlock(List<SLStatementNode> bodyNodes, int startPos, int length) {
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136 lexicalScope = lexicalScope.outer;
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137
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138 List<SLStatementNode> flattenedNodes = new ArrayList<>(bodyNodes.size());
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139 flattenBlocks(bodyNodes, flattenedNodes);
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140
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141 final SourceSection src = source.createSection("block", startPos, length);
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142 return new SLBlockNode(src, flattenedNodes.toArray(new SLStatementNode[flattenedNodes.size()]));
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143 }
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144
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145 private void flattenBlocks(Iterable<? extends Node> bodyNodes, List<SLStatementNode> flattenedNodes) {
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146 for (Node n : bodyNodes) {
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147 if (n instanceof SLBlockNode) {
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148 flattenBlocks(n.getChildren(), flattenedNodes);
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149 } else {
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150 flattenedNodes.add((SLStatementNode) n);
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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 /**
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156 * Returns an {@link SLBreakNode} for the given token.
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157 *
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158 * @param breakToken The token containing the break node's info.
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159 * @return A SLBreakNode for the given token.
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160 */
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161 public SLStatementNode createBreak(Token breakToken) {
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162 final SLBreakNode breakNode = new SLBreakNode(srcFromToken(breakToken));
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163 return breakNode;
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164 }
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165
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166 /**
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167 * Returns an {@link SLContinueNode} for the given token.
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168 *
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169 * @param continueToken The token containing the continue node's info.
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170 * @return A SLContinueNode built using the given token.
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171 */
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172 public SLStatementNode createContinue(Token continueToken) {
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173 final SLContinueNode continueNode = new SLContinueNode(srcFromToken(continueToken));
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174 return continueNode;
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175 }
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176
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177 /**
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178 * Returns an {@link SLWhileNode} for the given parameters.
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179 *
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180 * @param whileToken The token containing the while node's info
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181 * @param conditionNode The conditional node for this while loop
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182 * @param bodyNode The body of the while loop
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183 * @return A SLWhileNode built using the given parameters.
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184 */
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185 public SLStatementNode createWhile(Token whileToken, SLExpressionNode conditionNode, SLStatementNode bodyNode) {
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186 final int start = whileToken.charPos;
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187 final int end = bodyNode.getSourceSection().getCharEndIndex();
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188 final SLWhileNode whileNode = new SLWhileNode(source.createSection(whileToken.val, start, end - start), conditionNode, bodyNode);
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189 return whileNode;
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190 }
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191
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192 /**
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193 * Returns an {@link SLIfNode} for the given parameters.
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194 *
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195 * @param ifToken The token containing the if node's info
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196 * @param conditionNode The condition node of this if statement
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197 * @param thenPartNode The then part of the if
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198 * @param elsePartNode The else part of the if
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199 * @return An SLIfNode for the given parameters.
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200 */
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201 public SLStatementNode createIf(Token ifToken, SLExpressionNode conditionNode, SLStatementNode thenPartNode, SLStatementNode elsePartNode) {
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202 final int start = ifToken.charPos;
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203 final int end = elsePartNode == null ? thenPartNode.getSourceSection().getCharEndIndex() : elsePartNode.getSourceSection().getCharEndIndex();
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204 final SLIfNode ifNode = new SLIfNode(source.createSection(ifToken.val, start, end - start), conditionNode, thenPartNode, elsePartNode);
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205 return ifNode;
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206 }
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207
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208 /**
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209 * Returns an {@link SLReturnNode} for the given parameters.
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210 *
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211 * @param t The token containing the return node's info
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212 * @param valueNode The value of the return
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213 * @return An SLReturnNode for the given parameters.
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214 */
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215 public SLStatementNode createReturn(Token t, SLExpressionNode valueNode) {
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216 final int start = t.charPos;
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217 final int length = valueNode == null ? t.val.length() : valueNode.getSourceSection().getCharEndIndex() - start;
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218 final SLReturnNode returnNode = new SLReturnNode(source.createSection(t.val, start, length), valueNode);
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219 return returnNode;
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220 }
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221
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222 /**
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223 * Returns the corresponding subclass of {@link SLExpressionNode} for binary expressions.
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224 * </br>These nodes are currently not instrumented.
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225 *
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226 * @param opToken The operator of the binary expression
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227 * @param leftNode The left node of the expression
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228 * @param rightNode The right node of the expression
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229 * @return A subclass of SLExpressionNode using the given parameters based on the given opToken.
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230 */
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231 public SLExpressionNode createBinary(Token opToken, SLExpressionNode leftNode, SLExpressionNode rightNode) {
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232 int start = leftNode.getSourceSection().getCharIndex();
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233 int length = rightNode.getSourceSection().getCharEndIndex() - start;
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234 final SourceSection src = source.createSection(opToken.val, start, length);
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235 switch (opToken.val) {
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236 case "+":
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237 return SLAddNodeFactory.create(src, leftNode, rightNode);
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238 case "*":
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239 return SLMulNodeFactory.create(src, leftNode, rightNode);
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240 case "/":
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241 return SLDivNodeFactory.create(src, leftNode, rightNode);
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242 case "-":
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243 return SLSubNodeFactory.create(src, leftNode, rightNode);
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244 case "<":
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245 return SLLessThanNodeFactory.create(src, leftNode, rightNode);
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246 case "<=":
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247 return SLLessOrEqualNodeFactory.create(src, leftNode, rightNode);
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248 case ">":
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249 return SLLogicalNotNodeFactory.create(src, SLLessOrEqualNodeFactory.create(null, leftNode, rightNode));
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250 case ">=":
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251 return SLLogicalNotNodeFactory.create(src, SLLessThanNodeFactory.create(null, leftNode, rightNode));
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252 case "==":
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253 return SLEqualNodeFactory.create(src, leftNode, rightNode);
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254 case "!=":
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255 return SLLogicalNotNodeFactory.create(src, SLEqualNodeFactory.create(null, leftNode, rightNode));
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256 case "&&":
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257 return SLLogicalAndNodeFactory.create(src, leftNode, rightNode);
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258 case "||":
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259 return SLLogicalOrNodeFactory.create(src, leftNode, rightNode);
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260 default:
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261 throw new RuntimeException("unexpected operation: " + opToken.val);
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262 }
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263 }
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264
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265 /**
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266 * Returns an {@link SLInvokeNode} for the given parameters.
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267 *
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268 * @param nameToken The name of the function being called
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269 * @param parameterNodes The parameters of the function call
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270 * @param finalToken A token used to determine the end of the sourceSelection for this call
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271 * @return An SLInvokeNode for the given parameters.
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272 */
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273 public SLExpressionNode createCall(Token nameToken, List<SLExpressionNode> parameterNodes, Token finalToken) {
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274 final int startPos = nameToken.charPos;
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275 final int endPos = finalToken.charPos + finalToken.val.length();
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276 final SourceSection src = source.createSection(nameToken.val, startPos, endPos - startPos);
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277 SLExpressionNode functionNode = createRead(nameToken);
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278 return SLInvokeNode.create(src, functionNode, parameterNodes.toArray(new SLExpressionNode[parameterNodes.size()]));
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279 }
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280
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281 /**
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282 * Returns an {@link SLWriteLocalVariableNode} for the given parameters.
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283 *
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284 * @param nameToken The name of the variable being assigned
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285 * @param valueNode The value to be assigned
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286 * @return An SLExpressionNode for the given parameters.
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287 */
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288 public SLExpressionNode createAssignment(Token nameToken, SLExpressionNode valueNode) {
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289 FrameSlot frameSlot = frameDescriptor.findOrAddFrameSlot(nameToken.val);
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290 lexicalScope.locals.put(nameToken.val, frameSlot);
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291 final int start = nameToken.charPos;
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292 final int length = valueNode.getSourceSection().getCharEndIndex() - start;
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293 return SLWriteLocalVariableNodeFactory.create(source.createSection("=", start, length), valueNode, frameSlot);
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294 }
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295
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296 /**
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297 * Returns a {@link SLReadLocalVariableNode} if this read is a local variable or a
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298 * {@link SLFunctionLiteralNode} if this read is global. In Simple, the only global names are
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299 * functions. </br> There is currently no instrumentation for this node.
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300 *
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301 * @param nameToken The name of the variable/function being read
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302 * @return either:
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303 * <ul>
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304 * <li>A SLReadLocalVariableNode representing the local variable being read.</li>
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305 * <li>A SLFunctionLiteralNode representing the function definition</li>
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306 * </ul>
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307 */
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308 public SLExpressionNode createRead(Token nameToken) {
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309 final FrameSlot frameSlot = lexicalScope.locals.get(nameToken.val);
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310 final SourceSection src = srcFromToken(nameToken);
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311 if (frameSlot != null) {
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312 /* Read of a local variable. */
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313 return SLReadLocalVariableNodeFactory.create(src, frameSlot);
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314 } else {
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315 /* Read of a global name. In our language, the only global names are functions. */
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316 return new SLFunctionLiteralNode(src, context.getFunctionRegistry().lookup(nameToken.val));
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317 }
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318 }
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319
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320 public SLExpressionNode createStringLiteral(Token literalToken) {
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321 /* Remove the trailing and ending " */
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322 String literal = literalToken.val;
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323 assert literal.length() >= 2 && literal.startsWith("\"") && literal.endsWith("\"");
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324 final SourceSection src = srcFromToken(literalToken);
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325 literal = literal.substring(1, literal.length() - 1);
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326
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327 return new SLStringLiteralNode(src, literal);
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328 }
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329
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330 public SLExpressionNode createNumericLiteral(Token literalToken) {
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331 final SourceSection src = srcFromToken(literalToken);
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332 try {
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333 /* Try if the literal is small enough to fit into a long value. */
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334 return new SLLongLiteralNode(src, Long.parseLong(literalToken.val));
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335 } catch (NumberFormatException ex) {
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336 /* Overflow of long value, so fall back to BigInteger. */
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337 return new SLBigIntegerLiteralNode(src, new BigInteger(literalToken.val));
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338 }
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339 }
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340
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341 public SLExpressionNode createParenExpression(SLExpressionNode expressionNode, int start, int length) {
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342 final SourceSection src = source.createSection("()", start, length);
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343 return new SLParenExpressionNode(src, expressionNode);
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344 }
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345
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346 /**
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347 * Creates source description of a single token.
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348 */
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349 private SourceSection srcFromToken(Token token) {
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350 return source.createSection(token.val, token.charPos, token.val.length());
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351 }
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352
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353 }