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annotate graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/parser/SLNodeFactory.java @ 13761:7c418666c6c9

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Refactoring and cleanup of Simple Language (more to come soon)
author Christian Wimmer <christian.wimmer@oracle.com>
date Fri, 24 Jan 2014 18:16:24 -0800
parents graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/SLNodeFactory.java@06afa0db90b3
children cad8bed1a1ac
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2012, 2012, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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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.*;
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29 import com.oracle.truffle.api.frame.*;
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30 import com.oracle.truffle.api.nodes.*;
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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 public class SLNodeFactory {
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39
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40 static class LexicalScope {
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41 protected final LexicalScope outer;
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42 protected final Map<String, FrameSlot> locals;
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43
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44 public LexicalScope(LexicalScope outer) {
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45 this.outer = outer;
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46 this.locals = new HashMap<>();
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47 if (outer != null) {
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48 locals.putAll(outer.locals);
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49 }
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50 }
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51 }
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52
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53 /* State while parsing a source unit. */
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54 private final SLContext context;
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55 private final Source source;
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56 private final Parser parser;
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57
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58 /* State while parsing a function. */
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59 private String functionName;
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60 private FrameDescriptor frameDescriptor;
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61 private List<SLStatementNode> methodNodes;
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62
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63 /* State while parsing a block. */
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64 private LexicalScope lexicalScope;
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65
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66 public SLNodeFactory(SLContext context, Source source, Parser parser) {
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67 this.context = context;
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68 this.source = source;
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69 this.parser = parser;
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70 }
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71
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72 public void startFunction(String name, List<String> parameters) {
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73 assert functionName == null;
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74 assert frameDescriptor == null;
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75 assert lexicalScope == null;
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76
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77 functionName = name;
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78 frameDescriptor = new FrameDescriptor();
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79 startBlock();
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80
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81 /*
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82 * Method parameters are assigned to local variables at the beginning of the method. This
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83 * ensures that accesses to parameters are specialized the same way as local variables are
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84 * specialized.
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85 */
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86 methodNodes = new ArrayList<>(parameters.size());
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87 for (int i = 0; i < parameters.size(); i++) {
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88 methodNodes.add(createAssignment(parameters.get(i), new SLReadArgumentNode(i)));
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89 }
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90 }
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91
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92 public void finishFunction(SLStatementNode body) {
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93 methodNodes.add(body);
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94 SLStatementNode methodBlock = finishBlock(methodNodes);
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95 assert lexicalScope == null : "Wrong scoping of blocks in parser";
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96
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97 context.getFunctionRegistry().register(functionName, SLRootNode.createFunction(functionName, frameDescriptor, methodBlock));
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98
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99 functionName = null;
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100 frameDescriptor = null;
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101 lexicalScope = null;
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102 }
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103
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104 public void startBlock() {
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105 lexicalScope = new LexicalScope(lexicalScope);
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106 }
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107
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108 public SLStatementNode finishBlock(List<SLStatementNode> statements) {
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109 lexicalScope = lexicalScope.outer;
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110
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111 List<SLStatementNode> flattened = new ArrayList<>(statements.size());
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112 flattenBlocks(statements, flattened);
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113 if (flattened.size() == 1) {
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114 return flattened.get(0);
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115 } else {
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116 return assignSource(new SLBlockNode(flattened.toArray(new SLStatementNode[flattened.size()])));
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117 }
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118 }
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119
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120 private void flattenBlocks(Iterable<? extends Node> statements, List<SLStatementNode> flattened) {
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121 for (Node statement : statements) {
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122 if (statement instanceof SLBlockNode) {
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123 flattenBlocks(statement.getChildren(), flattened);
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124 } else {
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125 flattened.add((SLStatementNode) statement);
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126 }
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127 }
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128 }
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129
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130 private <T extends Node> T assignSource(T node) {
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131 assert functionName != null;
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132 node.assignSourceSection(ParserUtils.createSourceSection(source, functionName, parser));
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133 return node;
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134 }
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135
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136 public SLExpressionNode createAssignment(String name, SLExpressionNode value) {
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137 FrameSlot frameSlot = frameDescriptor.findOrAddFrameSlot(name);
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138 lexicalScope.locals.put(name, frameSlot);
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139 return assignSource(WriteLocalNodeFactory.create(frameSlot, value));
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140 }
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141
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142 public SLExpressionNode createRead(String name) {
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143 FrameSlot frameSlot = lexicalScope.locals.get(name);
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144 if (frameSlot != null) {
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145 /* Read of a local variable. */
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146 return assignSource(ReadLocalNodeFactory.create(frameSlot));
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147 } else {
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148 /* Read of a global name. In our language, the only global names are functions. */
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149 return new SLFunctionLiteralNode(context.getFunctionRegistry().lookup(name));
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150 }
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151 }
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152
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153 public SLExpressionNode createNumericLiteral(String value) {
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154 try {
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155 return assignSource(new SLLongLiteralNode(Long.parseLong(value)));
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156 } catch (NumberFormatException ex) {
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157 return assignSource(new SLBigIntegerLiteralNode(new BigInteger(value)));
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158 }
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159 }
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160
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161 public SLExpressionNode createStringLiteral(String value) {
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162 return assignSource(new SLStringLiteralNode(value));
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163 }
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164
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165 public SLStatementNode createWhile(SLExpressionNode condition, SLStatementNode body) {
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166 return assignSource(new SLWhileNode(condition, body));
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167 }
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168
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169 public SLStatementNode createBreak() {
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170 return assignSource(new SLBreakNode());
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171 }
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172
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173 public SLStatementNode createContinue() {
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174 return assignSource(new SLContinueNode());
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175 }
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176
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177 public SLExpressionNode createCall(SLExpressionNode function, List<SLExpressionNode> parameters) {
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178 return assignSource(SLCallNode.create(function, parameters.toArray(new SLExpressionNode[parameters.size()])));
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179 }
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180
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181 public SLExpressionNode createBinary(String operation, SLExpressionNode left, SLExpressionNode right) {
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182 SLExpressionNode binary;
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183 switch (operation) {
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184 case "+":
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185 binary = SLAddNodeFactory.create(left, right);
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186 break;
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187 case "*":
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188 binary = SLMulNodeFactory.create(left, right);
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189 break;
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190 case "/":
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191 binary = SLDivNodeFactory.create(left, right);
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192 break;
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193 case "-":
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194 binary = SLSubNodeFactory.create(left, right);
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195 break;
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196 case "<":
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197 binary = SLLessThanNodeFactory.create(left, right);
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198 break;
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199 case "<=":
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200 binary = SLLessOrEqualNodeFactory.create(left, right);
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201 break;
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202 case "==":
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203 binary = SLEqualNodeFactory.create(left, right);
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204 break;
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205 case "!=":
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206 binary = SLNotEqualNodeFactory.create(left, right);
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207 break;
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208 case "&&":
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209 binary = SLLogicalAndNodeFactory.create(left, right);
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210 break;
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211 case "||":
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212 binary = SLLogicalOrNodeFactory.create(left, right);
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213 break;
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214 default:
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215 throw new RuntimeException("unexpected operation: " + operation);
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216 }
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217 return assignSource(binary);
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218 }
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219
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220 public SLStatementNode createReturn(SLExpressionNode value) {
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221 // FrameSlot slot = frameDescriptor.findOrAddFrameSlot("<retval>", FrameSlotKind.Int);
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222 // if (returnValue == null) {
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223 // returnValue = ReadLocalNodeFactory.create(slot);
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224 // }
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225 // SLStatementNode write = WriteLocalNodeFactory.create(slot, value);
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226 // return assignSource(new SLReturnNode(write));
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227 return assignSource(new SLReturnNode(value));
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228 }
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229
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230 public SLStatementNode createIf(SLExpressionNode condition, SLStatementNode then, SLStatementNode elseNode) {
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231 return assignSource(new SLIfNode(condition, then, elseNode));
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232 }
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233
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234 }