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annotate sema/SymbolTableBuilder.d @ 45:9bc660cbdbec new_gen

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If statements are back Also fixed a bug in the codegen preventing return in the else branch, now it is optional. Also found an issue with the way we are generating our llvm from ifs - it doesn't mean anything but the code looks ugly. if (cond_1) if (cond_2) statement; return 0; Becomes: br cond_1, then, merge then: br cond_2 then2, merge2 merge: ret 0 then2: statements merge2: br merge This is because we use appendBasicBlock on the function
author Anders Halager <halager@gmail.com>
date Wed, 23 Apr 2008 16:43:42 +0200
parents 495188f9078e
children da551f90e03f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 this()
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14 {
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15 table ~= new Scope;
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16 table[0].types["void"] = DType.Void;
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17 table[0].types["bool"] = DType.Bool;
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18 table[0].types["byte"] = DType.Byte;
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19 table[0].types["ubyte"] = DType.UByte;
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20 table[0].types["short"] = DType.Short;
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21 table[0].types["ushort"] = DType.UShort;
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22 table[0].types["int"] = DType.Int;
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23 table[0].types["uint"] = DType.UInt;
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24 table[0].types["long"] = DType.Long;
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25 table[0].types["ulong"] = DType.ULong;
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26 }
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27
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28 override void visit(Decl[] decls)
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29 {
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30 foreach (decl; decls)
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31 visitDecl(decl);
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32 }
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33
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34 override void visitDecl(Decl d)
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35 {
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36 d.env = current();
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37 super.visitDecl(d);
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38 }
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39
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40 override void visitStmt(Stmt s)
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41 {
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42 s.env = current();
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43 super.visitStmt(s);
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44 }
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45
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46 override void visitExp(Exp e)
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47 {
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48 e.env = current();
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49 super.visitExp(e);
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50 }
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51
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52 override void visitFuncDecl(FuncDecl d)
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53 {
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54 auto sym = current().add(d.identifier);
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55 auto sc = push();
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56 sym.type = typeOf(d.type, sc);
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57 visitExp(d.type);
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58 visitExp(d.identifier);
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59 d.env = current();
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60 sc.parentFunction = sym;
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61 foreach (arg; d.funcArgs)
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62 visitDecl(arg);
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63 foreach (stmt; d.statements)
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64 visitStmt(stmt);
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65 pop(sc);
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66 }
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67
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68 override void visitVarDecl(VarDecl d)
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69 {
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70 if (d.init)
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71 visitExp(d.init);
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72
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73 if (need_push > 0) {
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74 push();
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75 --need_push;
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76 }
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77
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78 auto sc = current();
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79 auto sym = sc.add(d.identifier);
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80 sym.type = typeOf(d.type, sc);
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81 d.env = sc;
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82 visitExp(d.type);
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83 visitExp(d.identifier);
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84 }
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85
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86 override void visitStructDecl(StructDecl s)
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87 {
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88 auto sc = current();
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89 auto sym = sc.add(s.identifier);
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90 DType[char[]] types;
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91 foreach(varDecl ; s.vars)
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92 {
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93 types[varDecl.identifier.get] = typeOf(varDecl.type, sc);
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94 }
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95
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96 auto type = new DStruct(s.identifier);
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97
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98 type.setMembers(types);
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99
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100 sc.types[s.identifier.get] = type;
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101 sym.type = type;
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102 s.env = sc;
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103 super.visitStructDecl(s);
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104 }
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105
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106 override void visitDeclStmt(DeclStmt d)
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107 {
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108 ++need_push;
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109 super.visitDeclStmt(d);
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110 }
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111 private uint need_push = 0;
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112
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113 override void visitIfStmt(IfStmt s)
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114 {
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115 s.env = current();
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116 visitExp(s.cond);
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117 auto sc = push();
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118 visitStmt(s.then_body);
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119 pop(sc);
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120
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121 if (s.else_body !is null)
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122 {
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123 sc = push();
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124 visitStmt(s.else_body);
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125 pop(sc);
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126 }
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127 }
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128
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129 override void visitWhileStmt(WhileStmt s)
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130 {
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131 s.env = current();
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132 auto sc = push();
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133 super.visitWhileStmt(s);
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134 pop(sc);
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135 }
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136
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137 override void visitCompoundStmt(CompoundStatement s)
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138 {
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139 s.env = current();
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140 auto sc = push();
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141 super.visitCompoundStmt(s);
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142 pop(sc);
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143 }
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144
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145 private:
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146 Scope[] table;
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147
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148 Scope push()
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149 {
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150 auto sc = new Scope(current());
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151 table ~= sc;
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152 return sc;
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153 }
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154
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155 Scope pop(Scope sc = null)
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156 {
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157 if (sc !is null)
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158 {
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159 table.length = table.find(sc);
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160 return sc;
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161 }
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162
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163 auto res = table[$ - 1];
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164 table.length = table.length - 1;
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165 return res;
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166 }
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167
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168 Scope current()
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169 {
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170 return table[$ - 1];
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171 }
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172
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173 DType typeOf(Identifier id, Scope sc)
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174 {
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175 return sc.findType(id);
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176
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177 /*
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178 if (auto type = id.get in types)
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179 return *type;
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180 DType res = new DType(id);
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181 types[id.get] = res;
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182 return res;*/
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183 }
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184 DType[char[]] types;
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185 }
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186