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annotate truffle/com.oracle.truffle.sl/src/com/oracle/truffle/sl/parser/SLNodeFactory.java @ 22157:dc83cc1f94f2

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Using fully qualified imports
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Wed, 16 Sep 2015 11:33:22 +0200
parents 503529c65456
children 8dddde8b20d4
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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
22157
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43 import com.oracle.truffle.api.frame.FrameDescriptor;
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44 import com.oracle.truffle.api.frame.FrameSlot;
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45 import com.oracle.truffle.api.nodes.Node;
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46 import com.oracle.truffle.api.source.Source;
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47 import com.oracle.truffle.api.source.SourceSection;
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48 import com.oracle.truffle.sl.nodes.SLExpressionNode;
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49 import com.oracle.truffle.sl.nodes.SLRootNode;
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50 import com.oracle.truffle.sl.nodes.SLStatementNode;
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51 import com.oracle.truffle.sl.nodes.access.SLReadPropertyNode;
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52 import com.oracle.truffle.sl.nodes.access.SLWritePropertyNode;
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53 import com.oracle.truffle.sl.nodes.call.SLInvokeNode;
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54 import com.oracle.truffle.sl.nodes.call.SLInvokeNodeGen;
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55 import com.oracle.truffle.sl.nodes.controlflow.SLBlockNode;
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56 import com.oracle.truffle.sl.nodes.controlflow.SLBreakNode;
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57 import com.oracle.truffle.sl.nodes.controlflow.SLContinueNode;
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58 import com.oracle.truffle.sl.nodes.controlflow.SLFunctionBodyNode;
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59 import com.oracle.truffle.sl.nodes.controlflow.SLIfNode;
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60 import com.oracle.truffle.sl.nodes.controlflow.SLReturnNode;
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61 import com.oracle.truffle.sl.nodes.controlflow.SLWhileNode;
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62 import com.oracle.truffle.sl.nodes.expression.SLAddNodeGen;
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63 import com.oracle.truffle.sl.nodes.expression.SLBigIntegerLiteralNode;
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64 import com.oracle.truffle.sl.nodes.expression.SLDivNodeGen;
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65 import com.oracle.truffle.sl.nodes.expression.SLEqualNodeGen;
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66 import com.oracle.truffle.sl.nodes.expression.SLFunctionLiteralNode;
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67 import com.oracle.truffle.sl.nodes.expression.SLLessOrEqualNodeGen;
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68 import com.oracle.truffle.sl.nodes.expression.SLLessThanNodeGen;
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69 import com.oracle.truffle.sl.nodes.expression.SLLogicalAndNodeGen;
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70 import com.oracle.truffle.sl.nodes.expression.SLLogicalNotNodeGen;
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71 import com.oracle.truffle.sl.nodes.expression.SLLogicalOrNodeGen;
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72 import com.oracle.truffle.sl.nodes.expression.SLLongLiteralNode;
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73 import com.oracle.truffle.sl.nodes.expression.SLMulNodeGen;
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74 import com.oracle.truffle.sl.nodes.expression.SLParenExpressionNode;
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75 import com.oracle.truffle.sl.nodes.expression.SLStringLiteralNode;
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76 import com.oracle.truffle.sl.nodes.expression.SLSubNodeGen;
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77 import com.oracle.truffle.sl.nodes.local.SLReadArgumentNode;
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78 import com.oracle.truffle.sl.nodes.local.SLReadLocalVariableNode;
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79 import com.oracle.truffle.sl.nodes.local.SLReadLocalVariableNodeGen;
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80 import com.oracle.truffle.sl.nodes.local.SLWriteLocalVariableNode;
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81 import com.oracle.truffle.sl.nodes.local.SLWriteLocalVariableNodeGen;
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82 import com.oracle.truffle.sl.runtime.SLContext;
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83 import java.math.BigInteger;
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84 import java.util.ArrayList;
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85 import java.util.HashMap;
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86 import java.util.List;
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87 import java.util.Map;
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88
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89 /**
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90 * Helper class used by the SL {@link Parser} to create nodes. The code is factored out of the
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91 * automatically generated parser to keep the attributed grammar of SL small.
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92 */
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93 public class SLNodeFactory {
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94
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95 /**
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96 * Local variable names that are visible in the current block. Variables are not visible outside
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97 * of their defining block, to prevent the usage of undefined variables. Because of that, we can
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98 * decide during parsing if a name references a local variable or is a function name.
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99 */
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100 static class LexicalScope {
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101 protected final LexicalScope outer;
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102 protected final Map<String, FrameSlot> locals;
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103
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104 public LexicalScope(LexicalScope outer) {
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105 this.outer = outer;
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106 this.locals = new HashMap<>();
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107 if (outer != null) {
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108 locals.putAll(outer.locals);
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109 }
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110 }
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111 }
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112
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113 /* State while parsing a source unit. */
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114 private final SLContext context;
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115 private final Source source;
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116
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117 /* State while parsing a function. */
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118 private int functionStartPos;
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119 private String functionName;
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120 private int functionBodyStartPos; // includes parameter list
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121 private int parameterCount;
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122 private FrameDescriptor frameDescriptor;
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123 private List<SLStatementNode> methodNodes;
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124
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125 /* State while parsing a block. */
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126 private LexicalScope lexicalScope;
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127
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128 public SLNodeFactory(SLContext context, Source source) {
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129 this.context = context;
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130 this.source = source;
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131 }
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132
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133 public void startFunction(Token nameToken, int bodyStartPos) {
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134 assert functionStartPos == 0;
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135 assert functionName == null;
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136 assert functionBodyStartPos == 0;
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137 assert parameterCount == 0;
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138 assert frameDescriptor == null;
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139 assert lexicalScope == null;
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140
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141 functionStartPos = nameToken.charPos;
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142 functionName = nameToken.val;
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143 functionBodyStartPos = bodyStartPos;
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144 frameDescriptor = new FrameDescriptor();
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145 methodNodes = new ArrayList<>();
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146 startBlock();
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147 }
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148
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149 public void addFormalParameter(Token nameToken) {
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150 /*
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151 * Method parameters are assigned to local variables at the beginning of the method. This
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152 * ensures that accesses to parameters are specialized the same way as local variables are
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153 * specialized.
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154 */
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155 final SourceSection src = srcFromToken(nameToken);
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156 final SLReadArgumentNode readArg = new SLReadArgumentNode(src, parameterCount);
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157 methodNodes.add(createAssignment(nameToken, readArg));
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158 parameterCount++;
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159 }
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160
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161 public void finishFunction(SLStatementNode bodyNode) {
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162 methodNodes.add(bodyNode);
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163 final int bodyEndPos = bodyNode.getSourceSection().getCharEndIndex();
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164 final SourceSection functionSrc = source.createSection(functionName, functionStartPos, bodyEndPos - functionStartPos);
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165 final SLStatementNode methodBlock = finishBlock(methodNodes, functionBodyStartPos, bodyEndPos - functionBodyStartPos);
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166 assert lexicalScope == null : "Wrong scoping of blocks in parser";
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167
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168 final SLFunctionBodyNode functionBodyNode = new SLFunctionBodyNode(functionSrc, methodBlock);
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169 final SLRootNode rootNode = new SLRootNode(this.context, frameDescriptor, functionBodyNode, functionName);
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170 rootNode.assignSourceSection(functionSrc);
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171
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172 context.getFunctionRegistry().register(functionName, rootNode);
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173
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174 functionStartPos = 0;
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175 functionName = null;
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176 functionBodyStartPos = 0;
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177 parameterCount = 0;
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178 frameDescriptor = null;
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179 lexicalScope = null;
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180 }
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181
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182 public void startBlock() {
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183 lexicalScope = new LexicalScope(lexicalScope);
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184 }
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185
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186 public SLStatementNode finishBlock(List<SLStatementNode> bodyNodes, int startPos, int length) {
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187 lexicalScope = lexicalScope.outer;
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188
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189 List<SLStatementNode> flattenedNodes = new ArrayList<>(bodyNodes.size());
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190 flattenBlocks(bodyNodes, flattenedNodes);
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191
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192 final SourceSection src = source.createSection("block", startPos, length);
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193 return new SLBlockNode(src, flattenedNodes.toArray(new SLStatementNode[flattenedNodes.size()]));
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194 }
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195
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196 private void flattenBlocks(Iterable<? extends Node> bodyNodes, List<SLStatementNode> flattenedNodes) {
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197 for (Node n : bodyNodes) {
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198 if (n instanceof SLBlockNode) {
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199 flattenBlocks(n.getChildren(), flattenedNodes);
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200 } else {
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201 flattenedNodes.add((SLStatementNode) n);
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202 }
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203 }
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204 }
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205
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206 /**
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207 * Returns an {@link SLBreakNode} for the given token.
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208 *
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209 * @param breakToken The token containing the break node's info.
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210 * @return A SLBreakNode for the given token.
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211 */
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212 public SLStatementNode createBreak(Token breakToken) {
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213 final SLBreakNode breakNode = new SLBreakNode(srcFromToken(breakToken));
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214 return breakNode;
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215 }
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216
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217 /**
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218 * Returns an {@link SLContinueNode} for the given token.
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219 *
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220 * @param continueToken The token containing the continue node's info.
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221 * @return A SLContinueNode built using the given token.
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222 */
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223 public SLStatementNode createContinue(Token continueToken) {
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224 final SLContinueNode continueNode = new SLContinueNode(srcFromToken(continueToken));
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225 return continueNode;
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226 }
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227
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228 /**
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229 * Returns an {@link SLWhileNode} for the given parameters.
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230 *
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231 * @param whileToken The token containing the while node's info
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232 * @param conditionNode The conditional node for this while loop
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233 * @param bodyNode The body of the while loop
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234 * @return A SLWhileNode built using the given parameters.
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235 */
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236 public SLStatementNode createWhile(Token whileToken, SLExpressionNode conditionNode, SLStatementNode bodyNode) {
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237 final int start = whileToken.charPos;
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238 final int end = bodyNode.getSourceSection().getCharEndIndex();
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239 final SLWhileNode whileNode = new SLWhileNode(source.createSection(whileToken.val, start, end - start), conditionNode, bodyNode);
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240 return whileNode;
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241 }
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242
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243 /**
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244 * Returns an {@link SLIfNode} for the given parameters.
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245 *
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246 * @param ifToken The token containing the if node's info
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247 * @param conditionNode The condition node of this if statement
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248 * @param thenPartNode The then part of the if
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249 * @param elsePartNode The else part of the if
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250 * @return An SLIfNode for the given parameters.
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251 */
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252 public SLStatementNode createIf(Token ifToken, SLExpressionNode conditionNode, SLStatementNode thenPartNode, SLStatementNode elsePartNode) {
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253 final int start = ifToken.charPos;
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254 final int end = elsePartNode == null ? thenPartNode.getSourceSection().getCharEndIndex() : elsePartNode.getSourceSection().getCharEndIndex();
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255 final SLIfNode ifNode = new SLIfNode(source.createSection(ifToken.val, start, end - start), conditionNode, thenPartNode, elsePartNode);
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256 return ifNode;
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257 }
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258
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259 /**
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260 * Returns an {@link SLReturnNode} for the given parameters.
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261 *
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262 * @param t The token containing the return node's info
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263 * @param valueNode The value of the return
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264 * @return An SLReturnNode for the given parameters.
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265 */
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266 public SLStatementNode createReturn(Token t, SLExpressionNode valueNode) {
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267 final int start = t.charPos;
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268 final int length = valueNode == null ? t.val.length() : valueNode.getSourceSection().getCharEndIndex() - start;
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269 final SLReturnNode returnNode = new SLReturnNode(source.createSection(t.val, start, length), valueNode);
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270 return returnNode;
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271 }
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272
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273 /**
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274 * Returns the corresponding subclass of {@link SLExpressionNode} for binary expressions. </br>
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275 * These nodes are currently not instrumented.
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276 *
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277 * @param opToken The operator of the binary expression
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278 * @param leftNode The left node of the expression
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279 * @param rightNode The right node of the expression
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280 * @return A subclass of SLExpressionNode using the given parameters based on the given opToken.
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281 */
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282 public SLExpressionNode createBinary(Token opToken, SLExpressionNode leftNode, SLExpressionNode rightNode) {
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283 int start = leftNode.getSourceSection().getCharIndex();
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284 int length = rightNode.getSourceSection().getCharEndIndex() - start;
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285 final SourceSection src = source.createSection(opToken.val, start, length);
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286 switch (opToken.val) {
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287 case "+":
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288 return SLAddNodeGen.create(src, leftNode, rightNode);
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289 case "*":
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290 return SLMulNodeGen.create(src, leftNode, rightNode);
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291 case "/":
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292 return SLDivNodeGen.create(src, leftNode, rightNode);
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293 case "-":
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294 return SLSubNodeGen.create(src, leftNode, rightNode);
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295 case "<":
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296 return SLLessThanNodeGen.create(src, leftNode, rightNode);
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297 case "<=":
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298 return SLLessOrEqualNodeGen.create(src, leftNode, rightNode);
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299 case ">":
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300 return SLLogicalNotNodeGen.create(src, SLLessOrEqualNodeGen.create(null, leftNode, rightNode));
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301 case ">=":
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302 return SLLogicalNotNodeGen.create(src, SLLessThanNodeGen.create(null, leftNode, rightNode));
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303 case "==":
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304 return SLEqualNodeGen.create(src, leftNode, rightNode);
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305 case "!=":
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306 return SLLogicalNotNodeGen.create(src, SLEqualNodeGen.create(null, leftNode, rightNode));
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307 case "&&":
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308 return SLLogicalAndNodeGen.create(src, leftNode, rightNode);
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309 case "||":
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310 return SLLogicalOrNodeGen.create(src, leftNode, rightNode);
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311 default:
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312 throw new RuntimeException("unexpected operation: " + opToken.val);
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313 }
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314 }
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315
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316 /**
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317 * Returns an {@link SLInvokeNode} for the given parameters.
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318 *
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319 * @param functionNode The function being called
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320 * @param parameterNodes The parameters of the function call
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321 * @param finalToken A token used to determine the end of the sourceSelection for this call
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322 * @return An SLInvokeNode for the given parameters.
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323 */
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324 public SLExpressionNode createCall(SLExpressionNode functionNode, List<SLExpressionNode> parameterNodes, Token finalToken) {
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325 final int startPos = functionNode.getSourceSection().getCharIndex();
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326 final int endPos = finalToken.charPos + finalToken.val.length();
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327 final SourceSection src = source.createSection(functionNode.getSourceSection().getIdentifier(), startPos, endPos - startPos);
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328 return SLInvokeNodeGen.create(src, parameterNodes.toArray(new SLExpressionNode[parameterNodes.size()]), functionNode);
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329 }
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330
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331 /**
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332 * Returns an {@link SLWriteLocalVariableNode} for the given parameters.
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333 *
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334 * @param nameToken The name of the variable being assigned
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335 * @param valueNode The value to be assigned
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336 * @return An SLExpressionNode for the given parameters.
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337 */
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338 public SLExpressionNode createAssignment(Token nameToken, SLExpressionNode valueNode) {
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339 FrameSlot frameSlot = frameDescriptor.findOrAddFrameSlot(nameToken.val);
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340 lexicalScope.locals.put(nameToken.val, frameSlot);
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341 final int start = nameToken.charPos;
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342 final int length = valueNode.getSourceSection().getCharEndIndex() - start;
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343 return SLWriteLocalVariableNodeGen.create(source.createSection("=", start, length), valueNode, frameSlot);
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344 }
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345
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346 /**
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347 * Returns a {@link SLReadLocalVariableNode} if this read is a local variable or a
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348 * {@link SLFunctionLiteralNode} if this read is global. In Simple, the only global names are
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349 * functions. </br> There is currently no instrumentation for this node.
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350 *
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351 * @param nameToken The name of the variable/function being read
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352 * @return either:
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353 * <ul>
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354 * <li>A SLReadLocalVariableNode representing the local variable being read.</li>
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355 * <li>A SLFunctionLiteralNode representing the function definition</li>
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356 * </ul>
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357 */
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358 public SLExpressionNode createRead(Token nameToken) {
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359 final FrameSlot frameSlot = lexicalScope.locals.get(nameToken.val);
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360 final SourceSection src = srcFromToken(nameToken);
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361 if (frameSlot != null) {
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362 /* Read of a local variable. */
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363 return SLReadLocalVariableNodeGen.create(src, frameSlot);
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364 } else {
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365 /* Read of a global name. In our language, the only global names are functions. */
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366 return new SLFunctionLiteralNode(src, nameToken.val);
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367 }
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368 }
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369
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370 public SLExpressionNode createStringLiteral(Token literalToken) {
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371 /* Remove the trailing and ending " */
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372 String literal = literalToken.val;
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373 assert literal.length() >= 2 && literal.startsWith("\"") && literal.endsWith("\"");
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374 final SourceSection src = srcFromToken(literalToken);
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375 literal = literal.substring(1, literal.length() - 1);
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376
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377 return new SLStringLiteralNode(src, literal);
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378 }
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379
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380 public SLExpressionNode createNumericLiteral(Token literalToken) {
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381 final SourceSection src = srcFromToken(literalToken);
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382 try {
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383 /* Try if the literal is small enough to fit into a long value. */
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384 return new SLLongLiteralNode(src, Long.parseLong(literalToken.val));
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385 } catch (NumberFormatException ex) {
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386 /* Overflow of long value, so fall back to BigInteger. */
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387 return new SLBigIntegerLiteralNode(src, new BigInteger(literalToken.val));
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388 }
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389 }
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390
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391 public SLExpressionNode createParenExpression(SLExpressionNode expressionNode, int start, int length) {
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392 final SourceSection src = source.createSection("()", start, length);
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393 return new SLParenExpressionNode(src, expressionNode);
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394 }
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395
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396 /**
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397 * Returns an {@link SLReadPropertyNode} for the given parameters.
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398 *
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399 * @param receiverNode The receiver of the property access
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400 * @param nameToken The name of the property being accessed
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401 * @return An SLExpressionNode for the given parameters.
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402 */
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403 public SLExpressionNode createReadProperty(SLExpressionNode receiverNode, Token nameToken) {
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404 final int startPos = receiverNode.getSourceSection().getCharIndex();
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405 final int endPos = nameToken.charPos + nameToken.val.length();
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406 final SourceSection src = source.createSection(".", startPos, endPos - startPos);
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407 return SLReadPropertyNode.create(src, receiverNode, nameToken.val);
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408 }
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409
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410 /**
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411 * Returns an {@link SLWritePropertyNode} for the given parameters.
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412 *
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413 * @param receiverNode The receiver object of the property assignment
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414 * @param nameToken The name of the property being assigned
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415 * @param valueNode The value to be assigned
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416 * @return An SLExpressionNode for the given parameters.
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417 */
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418 public SLExpressionNode createWriteProperty(SLExpressionNode receiverNode, Token nameToken, SLExpressionNode valueNode) {
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419 final int start = receiverNode.getSourceSection().getCharIndex();
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420 final int length = valueNode.getSourceSection().getCharEndIndex() - start;
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421 SourceSection src = source.createSection("=", start, length);
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422 return SLWritePropertyNode.create(src, receiverNode, nameToken.val, valueNode);
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423 }
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424
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425 /**
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426 * Creates source description of a single token.
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427 */
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428 private SourceSection srcFromToken(Token token) {
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429 return source.createSection(token.val, token.charPos, token.val.length());
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430 }
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431
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432 }