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annotate sema/SymbolTableBuilder.d @ 55:79cb0afafabe new_gen

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Now structs are somewhat useable to use.
author Anders Johnsen <skabet@gmail.com>
date Sat, 26 Apr 2008 23:11:13 +0200
parents da551f90e03f
children 4ae365eff712
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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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46 auto st = (cast(DStruct)s.env.types[s.identifier.get]);
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47 foreach(varDecl ; s.vars)
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48 {
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49 st.addMember(typeOf(varDecl.type, varDecl.env), varDecl.identifier.get);
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50 }
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52 super.visitStructDecl(s);
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53 }
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55 DType typeOf(Identifier id, Scope sc)
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56 {
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57 return sc.findType(id);
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59 /*
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60 if (auto type = id.get in types)
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61 return *type;
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62 DType res = new DType(id);
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63 types[id.get] = res;
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64 return res;*/
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65 }
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66 }
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68 class ScopeBuilder : Visitor!(void)
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69 {
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70 this()
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71 {
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72 table ~= new Scope;
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73 table[0].types["void"] = DType.Void;
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74 table[0].types["bool"] = DType.Bool;
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75 table[0].types["byte"] = DType.Byte;
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76 table[0].types["ubyte"] = DType.UByte;
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77 table[0].types["short"] = DType.Short;
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78 table[0].types["ushort"] = DType.UShort;
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79 table[0].types["int"] = DType.Int;
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80 table[0].types["uint"] = DType.UInt;
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81 table[0].types["long"] = DType.Long;
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82 table[0].types["ulong"] = DType.ULong;
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83 }
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84
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85 override void visit(Decl[] decls)
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86 {
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87 foreach (decl; decls)
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88 visitDecl(decl);
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89 }
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90
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91 override void visitDecl(Decl d)
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92 {
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93 d.env = current();
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94 super.visitDecl(d);
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95 }
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96
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97 override void visitStmt(Stmt s)
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98 {
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99 s.env = current();
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100 super.visitStmt(s);
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101 }
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102
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103 override void visitExp(Exp e)
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104 {
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105 e.env = current();
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106 super.visitExp(e);
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107 }
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108
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109 override void visitFuncDecl(FuncDecl d)
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110 {
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111 auto sym = current().add(d.identifier);
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112 auto sc = push();
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113
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114 visitExp(d.type);
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115 visitExp(d.identifier);
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116 d.env = current();
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117 sc.parentFunction = sym;
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118 foreach (arg; d.funcArgs)
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119 visitDecl(arg);
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120 foreach (stmt; d.statements)
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121 visitStmt(stmt);
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122 pop(sc);
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123 }
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124
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125 override void visitVarDecl(VarDecl d)
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126 {
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127 if (d.init)
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128 visitExp(d.init);
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129
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130 if (need_push > 0 && current().parentFunction !is null) {
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131 push();
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132 --need_push;
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133 }
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134
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135 auto sc = current();
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136 auto sym = sc.add(d.identifier);
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137 d.env = sc;
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138 visitExp(d.type);
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139 visitExp(d.identifier);
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140 }
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141
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142 override void visitStructDecl(StructDecl s)
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143 {
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144 auto sc = current();
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145 auto sym = sc.add(s.identifier);
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146 s.env = sc;
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147 auto type = new DStruct(s.identifier);
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148
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149
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150 sc.types[s.identifier.get] = type;
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151
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152 sc = push();
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153 super.visitStructDecl(s);
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154 pop(sc);
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155 }
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156
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157 override void visitDeclStmt(DeclStmt d)
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158 {
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159 ++need_push;
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160 super.visitDeclStmt(d);
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161 }
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162 private uint need_push = 0;
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163
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164 override void visitIfStmt(IfStmt s)
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165 {
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166 s.env = current();
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167 visitExp(s.cond);
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168 auto sc = push();
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169 visitStmt(s.then_body);
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170 pop(sc);
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171
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172 if (s.else_body !is null)
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173 {
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174 sc = push();
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175 visitStmt(s.else_body);
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176 pop(sc);
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177 }
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178 }
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179
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180 override void visitWhileStmt(WhileStmt s)
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181 {
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182 s.env = current();
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183 auto sc = push();
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184 super.visitWhileStmt(s);
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185 pop(sc);
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186 }
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187
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188 override void visitCompoundStmt(CompoundStatement s)
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189 {
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190 s.env = current();
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191 auto sc = push();
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192 super.visitCompoundStmt(s);
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193 pop(sc);
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194 }
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195
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196 private:
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197 Scope[] table;
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198
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199 Scope push()
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200 {
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201 auto sc = new Scope(current());
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202 table ~= sc;
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203 return sc;
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204 }
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205
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206 Scope pop(Scope sc = null)
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207 {
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208 if (sc !is null)
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209 {
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210 table.length = table.find(sc);
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211 return sc;
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212 }
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213
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214 auto res = table[$ - 1];
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215 table.length = table.length - 1;
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216 return res;
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217 }
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218
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219 Scope current()
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220 {
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221 return table[$ - 1];
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222 }
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223 }
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224