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annotate sema/SymbolTableBuilder.d @ 53:da551f90e03f new_gen

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Added struct decl and forward ref. A note on structs: they need to make a new scope when declared. Otherwise you could access struct members as globals
author Anders Johnsen <skabet@gmail.com>
date Sat, 26 Apr 2008 18:52:27 +0200
parents 9bc660cbdbec
children 79cb0afafabe
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1 module sema.SymbolTableBuilder;
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2
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3 import tango.io.Stdout,
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4 tango.core.Array : find;
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5
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6 public
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7 import sema.SymbolTable;
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8
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9 import sema.Visitor;
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10
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11 class SymbolTableBuilder : Visitor!(void)
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12 {
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13 override void visit(Decl[] decls)
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14 {
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15 auto sb = new ScopeBuilder();
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16 sb.visit(decls);
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17 foreach (decl; decls)
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18 visitDecl(decl);
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19 }
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21 override void visitFuncDecl(FuncDecl d)
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22 {
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23 d.env.find(d.identifier).type = typeOf(d.type, d.env);
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24 visitExp(d.type);
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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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32 override void visitVarDecl(VarDecl d)
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33 {
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34 if (d.init)
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35 visitExp(d.init);
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37 d.env.find(d.identifier).type = typeOf(d.type, d.env);
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38 visitExp(d.type);
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39 visitExp(d.identifier);
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40 }
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42 override void visitStructDecl(StructDecl s)
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43 {
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44 DType[char[]] types;
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45 foreach(varDecl ; s.vars)
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46 {
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47 types[varDecl.identifier.get] = typeOf(varDecl.type, s.env);
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48 }
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50 (cast(DStruct)s.env.types[s.identifier.get]).setMembers(types);
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51 super.visitStructDecl(s);
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52 }
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54 DType typeOf(Identifier id, Scope sc)
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55 {
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56 return sc.findType(id);
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58 /*
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59 if (auto type = id.get in types)
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60 return *type;
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61 DType res = new DType(id);
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62 types[id.get] = res;
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63 return res;*/
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64 }
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65 }
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66
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67 class ScopeBuilder : Visitor!(void)
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68 {
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69 this()
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70 {
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71 table ~= new Scope;
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72 table[0].types["void"] = DType.Void;
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73 table[0].types["bool"] = DType.Bool;
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74 table[0].types["byte"] = DType.Byte;
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75 table[0].types["ubyte"] = DType.UByte;
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76 table[0].types["short"] = DType.Short;
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77 table[0].types["ushort"] = DType.UShort;
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78 table[0].types["int"] = DType.Int;
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79 table[0].types["uint"] = DType.UInt;
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80 table[0].types["long"] = DType.Long;
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81 table[0].types["ulong"] = DType.ULong;
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82 }
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83
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84 override void visit(Decl[] decls)
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85 {
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86 foreach (decl; decls)
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87 visitDecl(decl);
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88 }
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89
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90 override void visitDecl(Decl d)
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91 {
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92 d.env = current();
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93 super.visitDecl(d);
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94 }
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95
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96 override void visitStmt(Stmt s)
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97 {
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98 s.env = current();
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99 super.visitStmt(s);
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100 }
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101
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102 override void visitExp(Exp e)
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103 {
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104 e.env = current();
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105 super.visitExp(e);
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106 }
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107
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108 override void visitFuncDecl(FuncDecl d)
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109 {
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110 auto sym = current().add(d.identifier);
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111 auto sc = push();
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112
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113 visitExp(d.type);
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114 visitExp(d.identifier);
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115 d.env = current();
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116 sc.parentFunction = sym;
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117 foreach (arg; d.funcArgs)
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118 visitDecl(arg);
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119 foreach (stmt; d.statements)
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120 visitStmt(stmt);
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121 pop(sc);
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122 }
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123
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124 override void visitVarDecl(VarDecl d)
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125 {
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126 if (d.init)
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127 visitExp(d.init);
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128
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129 if (need_push > 0 && current().parentFunction !is null) {
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130 push();
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131 --need_push;
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132 }
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133
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134 auto sc = current();
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135 auto sym = sc.add(d.identifier);
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136 d.env = sc;
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137 visitExp(d.type);
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138 visitExp(d.identifier);
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139 }
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140
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141 override void visitStructDecl(StructDecl s)
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142 {
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143 auto sc = current();
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144 auto sym = sc.add(s.identifier);
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145
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146 auto type = new DStruct(s.identifier);
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147
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148 sc.types[s.identifier.get] = type;
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149 s.env = sc;
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150 super.visitStructDecl(s);
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151 }
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152
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153 override void visitDeclStmt(DeclStmt d)
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154 {
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155 ++need_push;
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156 super.visitDeclStmt(d);
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157 }
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158 private uint need_push = 0;
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159
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160 override void visitIfStmt(IfStmt s)
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161 {
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162 s.env = current();
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163 visitExp(s.cond);
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164 auto sc = push();
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165 visitStmt(s.then_body);
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166 pop(sc);
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167
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168 if (s.else_body !is null)
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169 {
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170 sc = push();
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171 visitStmt(s.else_body);
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172 pop(sc);
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173 }
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174 }
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175
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176 override void visitWhileStmt(WhileStmt s)
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177 {
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178 s.env = current();
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179 auto sc = push();
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180 super.visitWhileStmt(s);
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181 pop(sc);
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182 }
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183
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184 override void visitCompoundStmt(CompoundStatement s)
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185 {
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186 s.env = current();
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187 auto sc = push();
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188 super.visitCompoundStmt(s);
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189 pop(sc);
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190 }
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191
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192 private:
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193 Scope[] table;
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194
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195 Scope push()
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196 {
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197 auto sc = new Scope(current());
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198 table ~= sc;
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199 return sc;
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200 }
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201
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202 Scope pop(Scope sc = null)
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203 {
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204 if (sc !is null)
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205 {
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206 table.length = table.find(sc);
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207 return sc;
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208 }
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209
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210 auto res = table[$ - 1];
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211 table.length = table.length - 1;
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212 return res;
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213 }
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214
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215 Scope current()
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216 {
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217 return table[$ - 1];
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218 }
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219 }
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220