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annotate sema/SymbolTableBuilder.d @ 83:9e90694f5da0 new_gen

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Parse array indexing, and allow reading from arrays
author Anders Halager <halager@gmail.com>
date Fri, 02 May 2008 19:54:22 +0200
parents 06dda301ea61
children 29f486ccc203
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1 module sema.SymbolTableBuilder;
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3 import tango.io.Stdout,
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4 tango.core.Array : find;
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6 public
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7 import sema.SymbolTable;
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9 import sema.Visitor,
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10 basic.SmallArray;
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11
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12 class SymbolTableBuilder : Visitor!(void)
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13 {
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14 override void visit(Decl[] decls)
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15 {
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16 auto sb = new ScopeBuilder();
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17 sb.visit(decls);
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18 foreach (decl; decls)
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19 visitDecl(decl);
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20 }
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22 override void visitFuncDecl(FuncDecl d)
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23 {
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24 visitExp(d.returnType);
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25 visitExp(d.identifier);
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26 foreach (arg; d.funcArgs)
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27 visitDecl(arg);
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28 foreach (stmt; d.statements)
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29 visitStmt(stmt);
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30
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31 auto sym = d.env.find(d.identifier);
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32 sym.type = d.type;
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33 }
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35 override void visitVarDecl(VarDecl d)
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36 {
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37 visitExp(d.varType);
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38 if(!d.identifier)
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39 return;
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41 if (d.init)
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42 visitExp(d.init);
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44 d.env.find(d.identifier).type = typeOf(d.varType, d.env);
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45 visitExp(d.identifier);
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46 }
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48 override void visitStructDecl(StructDecl s)
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49 {
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50 DType[char[]] types;
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52 auto st = s.env.types[s.identifier.get].asStruct;
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53 foreach(varDecl ; s.vars)
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54 st.addMember(typeOf(varDecl.varType, varDecl.env), varDecl.identifier.get);
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56 super.visitStructDecl(s);
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57 }
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59 DType typeOf(Identifier id, Scope sc)
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60 {
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61 if(auto i = cast(PointerIdentifier)id)
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62 return (typeOf(i.pointerOf, sc)).getPointerTo();
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63 if(auto i = cast(ArrayIdentifier)id)
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64 return typeOf(i.arrayOf, sc).getAsArray(i.size);
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65 return sc.findType(id);
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66 }
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67 }
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69 class ScopeBuilder : Visitor!(void)
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70 {
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71 this()
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72 {
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73 table ~= new Scope;
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74 table[0].types["void"] = DType.Void;
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75 table[0].types["bool"] = DType.Bool;
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76 table[0].types["byte"] = DType.Byte;
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77 table[0].types["ubyte"] = DType.UByte;
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78 table[0].types["short"] = DType.Short;
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79 table[0].types["ushort"] = DType.UShort;
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80 table[0].types["int"] = DType.Int;
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81 table[0].types["uint"] = DType.UInt;
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82 table[0].types["long"] = DType.Long;
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83 table[0].types["ulong"] = DType.ULong;
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84 }
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85
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86 override void visit(Decl[] decls)
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87 {
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88 foreach (decl; decls)
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89 visitDecl(decl);
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90 }
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91
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92 override void visitDecl(Decl d)
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93 {
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94 d.env = current();
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95 super.visitDecl(d);
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96 }
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97
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98 override void visitStmt(Stmt s)
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99 {
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100 s.env = current();
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101 s.stmtIndex = s.env.stmtIndex;
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102 super.visitStmt(s);
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103 }
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104
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105 override void visitExp(Exp e)
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106 {
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107 e.env = current();
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108 e.stmtIndex = e.env.stmtIndex;
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109 super.visitExp(e);
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110 }
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111
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112 override void visitFuncDecl(FuncDecl d)
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113 {
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114 auto sym = current().add(d.identifier);
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115 auto sc = push();
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116
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117 visitExp(d.returnType);
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118 visitExp(d.identifier);
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119 d.env = current();
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120 sc.parentFunction = d;
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121 foreach (arg; d.funcArgs)
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122 visitDecl(arg);
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123 foreach (stmt; d.statements)
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124 {
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125 sc.currentStmtIndex++;
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126 visitStmt(stmt);
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127 }
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128 pop(sc);
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129 }
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130
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131 override void visitVarDecl(VarDecl d)
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132 {
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133 if (d.init)
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134 visitExp(d.init);
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135
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136 if (need_push > 0 && current().parentFunction !is null) {
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137 push();
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138 --need_push;
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139 }
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140
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141 if(!d.identifier)
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142 return;
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143 auto sc = current();
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144 auto sym = sc.add(d.identifier);
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145 d.env = sc;
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146 visitExp(d.varType);
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147 visitExp(d.identifier);
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148 }
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149
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150 override void visitStructDecl(StructDecl s)
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151 {
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152 auto sc = current();
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153 auto sym = sc.add(s.identifier);
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154 s.env = sc;
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155 auto type = new DStruct(s.identifier);
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156
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157 sc.types[s.identifier.get] = type;
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158
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159 sc = push();
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160 super.visitStructDecl(s);
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161 pop(sc);
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162 }
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163
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164 override void visitDeclStmt(DeclStmt d)
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165 {
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166 ++need_push;
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167 super.visitDeclStmt(d);
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168 }
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169 private uint need_push = 0;
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170
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171 override void visitIfStmt(IfStmt s)
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172 {
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173 s.env = current();
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174 visitExp(s.cond);
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175 auto sc = push();
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176 visitStmt(s.then_body);
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177 pop(sc);
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178
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179 if (s.else_body !is null)
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180 {
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181 sc = push();
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182 visitStmt(s.else_body);
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183 pop(sc);
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184 }
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185 }
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186
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187 override void visitWhileStmt(WhileStmt s)
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188 {
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189 s.env = current();
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190 auto sc = push();
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191 super.visitWhileStmt(s);
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192 pop(sc);
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193 }
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194
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195 override void visitCompoundStmt(CompoundStatement s)
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196 {
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197 s.env = current();
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198 auto sc = push();
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199 super.visitCompoundStmt(s);
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200 pop(sc);
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201 }
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202
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203 private:
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204 Scope[] table;
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205
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206 Scope push()
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207 {
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208 auto sc = new Scope(current());
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209 table ~= sc;
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210 return sc;
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211 }
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212
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213 Scope pop(Scope sc = null)
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214 {
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215 if (sc !is null)
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216 {
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217 table.length = table.find(sc);
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218 return sc;
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219 }
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220
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221 auto res = table[$ - 1];
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222 table.length = table.length - 1;
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223 return res;
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224 }
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225
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226 Scope current()
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227 {
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228 return table[$ - 1];
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229 }
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230 }
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231