1 | // |
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2 | // Pascal Tree Grammar that walks tree, building symtab |
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3 | // |
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4 | // Adapted from, |
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5 | // Pascal User Manual And Report (Second Edition-1978) |
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6 | // Kathleen Jensen - Niklaus Wirth |
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7 | // |
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8 | // By |
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9 | // |
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10 | // Hakki Dogusan dogusanh@tr-net.net.tr |
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11 | // |
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12 | // Then significantly enhanced by Piet Schoutteten |
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13 | // with some guidance by Terence Parr. Piet added tree |
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14 | // construction, and some tree walkers. |
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15 | // |
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16 | |
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17 | { |
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18 | import java.util.*; |
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19 | import java.io.*; |
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20 | } |
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21 | |
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22 | class SymtabPhase extends PascalTreeParserSuper; |
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23 | |
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24 | options { |
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25 | importVocab = Pascal; |
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26 | ASTLabelType = "PascalAST"; |
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27 | } |
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28 | |
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29 | { |
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30 | Stack scopes = new Stack(); |
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31 | Stack usesScopes = new Stack(); |
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32 | //public static File thisUnit; |
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33 | public File thisUnit; |
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34 | } |
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35 | |
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36 | program |
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37 | : programHeading |
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38 | block |
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39 | {System.out.println(scopes.peek());} |
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40 | ; |
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41 | |
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42 | programHeading |
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43 | : #(PROGRAM IDENT identifierList) |
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44 | {Scope root = new Scope(null); |
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45 | scopes.push(root);} |
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46 | | #(UNIT IDENT) |
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47 | { |
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48 | Scope root = new Scope(null); // create new scope |
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49 | scopes.push(root); // enter new scope :) |
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50 | root.addSymbol(new Unit(#IDENT.getText())); // create unit symbol entry |
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51 | |
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52 | String tUnit = new String (#IDENT.getText()); |
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53 | tUnit = tUnit.concat(".sym"); |
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54 | thisUnit = new File (PascalParser.translateFilePath, tUnit); |
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55 | } |
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56 | ; |
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57 | |
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58 | block |
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59 | : ( labelDeclarationPart |
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60 | | constantDefinitionPart |
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61 | | typeDefinitionPart |
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62 | | variableDeclarationPart |
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63 | | procedureAndFunctionDeclarationPart |
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64 | | usesUnitsPart |
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65 | | IMPLEMENTATION |
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66 | { System.out.println(scopes.peek()); |
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67 | //write symbol table and exit when currentFileName != translateFileName |
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68 | if (PascalParser.currentFileName.compareTo(PascalParser.translateFileName) != 0) { |
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69 | try{ |
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70 | ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(thisUnit)); |
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71 | oos.writeObject(scopes); |
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72 | oos.close(); |
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73 | } |
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74 | catch (IOException e) { |
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75 | System.err.println("IOexception: "+e); } |
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76 | _t = null; |
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77 | throw new RecognitionException(); |
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78 | } |
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79 | } |
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80 | )* |
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81 | compoundStatement |
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82 | ; |
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83 | |
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84 | usesUnitsPart |
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85 | { |
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86 | String usesFile, usesSymtab; |
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87 | String oldUsesFile; |
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88 | File f, symFile; |
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89 | Object readSymtab = new Stack(); |
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90 | } |
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91 | : #(USES usesList:identifierList) |
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92 | // walk identifierList and make symbol table |
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93 | { |
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94 | usesList = (PascalAST) usesList.getFirstChild(); |
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95 | oldUsesFile = PascalParser.currentFileName; |
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96 | while (usesList !=null) { |
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97 | // make symboltable for usesFile |
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98 | usesFile = usesList.getText(); |
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99 | usesFile = usesFile.concat(".pas"); |
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100 | usesSymtab = usesList.getText(); |
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101 | usesSymtab = usesSymtab.concat(".sym"); |
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102 | |
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103 | f = new File(PascalParser.translateFilePath,usesFile); |
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104 | symFile = new File(PascalParser.translateFilePath,usesSymtab); |
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105 | |
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106 | // we have to build the symbol table when ... |
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107 | if (( !(symFile.exists() ) ) |
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108 | // this .sym file (usesSymtyb) does not exist or ... |
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109 | || ((f.lastModified()) > (symFile.lastModified()) ) ){ |
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110 | // the date of this .sym file (usesSymtyb) is older than the .pas file (usesFile) |
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111 | |
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112 | try { |
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113 | PascalParser.parseFile(f.getName(),new FileInputStream(f)); |
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114 | } |
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115 | catch (Exception e) { |
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116 | System.err.println("parser exception: "+e); |
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117 | e.printStackTrace(); // so we can get stack trace |
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118 | } |
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119 | } |
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120 | |
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121 | // read serialized symbol table and add to symbol table "usesScopes" |
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122 | File symTab = new File (PascalParser.translateFilePath , usesSymtab); |
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123 | try { |
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124 | ObjectInputStream ois = new ObjectInputStream(new FileInputStream(symTab)); |
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125 | readSymtab = ois.readObject(); |
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126 | ois.close(); |
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127 | } |
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128 | catch (ClassNotFoundException cnfe) { |
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129 | System.err.println("parser exception: "+cnfe); |
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130 | cnfe.printStackTrace(); // so we can get stack trace |
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131 | } |
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132 | catch (FileNotFoundException e) { |
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133 | System.err.println("parser exception: "+e); |
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134 | e.printStackTrace(); // so we can get stack trace |
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135 | } |
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136 | catch (IOException e) { |
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137 | System.err.println("parser exception: "+e); |
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138 | e.printStackTrace(); // so we can get stack trace |
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139 | } |
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140 | |
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141 | Stack symTabToPop = (Stack) readSymtab; |
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142 | |
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143 | // add uses symbol table "readSymtab" to symboltable "usesScopes" |
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144 | while (!(symTabToPop.empty())) { |
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145 | usesScopes.push(symTabToPop.pop()); |
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146 | } |
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147 | |
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148 | usesList = (PascalAST) usesList.getNextSibling(); |
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149 | } |
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150 | PascalParser.currentFileName = oldUsesFile; |
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151 | } |
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152 | ; |
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153 | |
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154 | constantDefinition |
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155 | { |
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156 | Constant c = null; |
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157 | } |
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158 | : #(r:EQUAL IDENT c=constant) |
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159 | { |
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160 | if ( c!=null ) { |
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161 | Scope sc = (Scope)scopes.peek(); |
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162 | c.setName(#IDENT.getText()); |
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163 | sc.addSymbol(c); |
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164 | r.symbol = c; // AST def root points to symbol table entry now |
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165 | } |
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166 | } |
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167 | ; |
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168 | |
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169 | constant returns [Constant c=null] |
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170 | : NUM_INT |
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171 | {c = new IntegerConstant(#NUM_INT.getText());} |
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172 | | NUM_REAL |
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173 | {c = new RealConstant(#NUM_REAL.getText());} |
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174 | | #( PLUS |
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175 | ( NUM_INT |
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176 | {c = new IntegerConstant(#NUM_INT.getText());} |
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177 | | NUM_REAL |
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178 | {c = new RealConstant(#NUM_REAL.getText());} |
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179 | | IDENT |
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180 | ) |
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181 | ) |
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182 | | #( MINUS |
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183 | ( NUM_INT |
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184 | {c = new IntegerConstant(#NUM_INT.getText());} |
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185 | | NUM_REAL |
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186 | {c = new RealConstant(#NUM_REAL.getText());} |
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187 | | IDENT |
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188 | ) |
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189 | ) |
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190 | | IDENT |
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191 | | STRING_LITERAL |
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192 | | #(CHR (NUM_INT|NUM_REAL)) |
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193 | ; |
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194 | |
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195 | typeDefinition |
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196 | { |
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197 | TypeSpecifier t=null; |
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198 | } |
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199 | : #(TYPEDECL IDENT |
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200 | ( type |
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201 | | #(r:FUNCTION (formalParameterList)? t=resultType) |
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202 | { |
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203 | if ( t!=null ) {r.symbol = t;} |
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204 | } |
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205 | |
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206 | | #(PROCEDURE (formalParameterList)?) |
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207 | ) |
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208 | ) |
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209 | ; |
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210 | |
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211 | type returns [TypeSpecifier ts=null] |
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212 | : #(SCALARTYPE identifierList) |
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213 | | #(DOTDOT constant constant) |
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214 | | ts=typeIdentifier |
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215 | | structuredType |
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216 | | #(POINTER typeIdentifier) |
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217 | ; |
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218 | |
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219 | typeIdentifier returns [TypeSpecifier ts=null] |
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220 | : IDENT // lookup and return type spec |
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221 | | CHAR |
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222 | | BOOLEAN |
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223 | | INTEGER {ts=PascalParser.symbolTable.getPredefinedType("integer");} |
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224 | | REAL {ts=PascalParser.symbolTable.getPredefinedType("real");} |
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225 | | #( STRING |
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226 | ( IDENT |
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227 | | NUM_INT |
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228 | | NUM_REAL |
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229 | | |
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230 | ) |
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231 | ) |
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232 | ; |
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233 | |
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234 | variableDeclaration |
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235 | { |
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236 | Vector ids=null; |
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237 | TypeSpecifier t=null; |
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238 | } |
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239 | : #(r:VARDECL ids=identifierList t=type) |
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240 | { |
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241 | // walk list of identifiers, creating variable syms and setting types |
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242 | if ( t!=null ) { |
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243 | Scope sc = (Scope)scopes.peek(); |
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244 | for (int i=0; ids!=null && i<ids.size(); i++) { |
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245 | String id = (String)ids.elementAt(i); |
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246 | Variable v = new Variable(id,t); |
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247 | sc.addSymbol(v); |
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248 | r.symbol = t; // AST def root points to symbol table entry now |
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249 | } |
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250 | } |
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251 | } |
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252 | ; |
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253 | |
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254 | parameterGroup |
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255 | { |
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256 | Vector ids=null; |
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257 | TypeSpecifier t=null; |
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258 | } |
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259 | : #(r:ARGDECL ids=identifierList t=typeIdentifier) |
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260 | { |
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261 | // walk list of identifiers, creating variable syms and setting types |
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262 | if ( t!=null ) { |
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263 | Scope sc = (Scope)scopes.peek(); |
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264 | for (int i=0; ids!=null && i<ids.size(); i++) { |
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265 | String id = (String)ids.elementAt(i); |
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266 | Variable v = new Variable(id,t); |
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267 | sc.addSymbol(v); |
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268 | r.symbol = t; // AST def root points to symbol table entry now |
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269 | } |
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270 | } |
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271 | } |
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272 | |
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273 | ; |
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274 | |
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275 | identifierList returns [Vector ids=new Vector()] |
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276 | : #( IDLIST ( IDENT {ids.addElement(#IDENT.getText());} )+ ) |
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277 | ; |
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278 | |
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279 | functionDeclaration |
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280 | { |
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281 | TypeSpecifier t=null; |
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282 | } |
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283 | : #(r:FUNCTION IDENT (formalParameterList)? t=resultType block) |
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284 | { |
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285 | if ( t!=null ) {r.symbol = t;} |
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286 | } |
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287 | ; |
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288 | |
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289 | resultType returns [TypeSpecifier ts=null] |
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290 | : ts=typeIdentifier |
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291 | ; |
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