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annotate sema/AstAction.d @ 94:48bb2287c035 new_gen

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Added Modules. Right now it's very simple - will grow with time and need.
author Anders Johnsen <skabet@gmail.com>
date Tue, 06 May 2008 16:24:14 +0200
parents eb5b2c719a39
children 857f0d530789
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1 module sema.AstAction;
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2
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3 import Integer = tango.text.convert.Integer;
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4
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5 import lexer.Token;
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6
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7 import misc.Error,
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8 basic.SourceManager;
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9
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10 import ast.Module,
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11 ast.Exp,
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12 ast.Stmt,
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13 ast.Decl;
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14
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15 public
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16 import parser.Action;
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17
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18 /**
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19 This class implements the default actions for Dang, by building up an AST
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20 with the data needed in a compiler.
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21 */
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22 class AstAction : Action
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23 {
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24 this(SourceManager sm)
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25 {
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26 this.sm = sm;
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27 }
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28 private SourceManager sm;
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29
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30 private Identifier handleType(Id type)
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31 {
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32 if(auto t = cast(PointerId)type)
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33 return new PointerIdentifier(handleType(t.id));
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34 if(auto t = cast(ArrayId)type)
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35 return new ArrayIdentifier(handleType(t.id), cast(IntegerLit)t.number);
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36 else
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37 return identifierFromTok(type.tok);
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38 }
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39
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40 private Identifier identifierFromTok(Token t)
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41 {
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42 return new Identifier(t.location, sm.getText(t.asRange));
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43 }
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44
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45 override ModuleT actOnModule(char[] name)
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46 {
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47 return new Module(name);
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48 }
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49
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50 override void actOnModuleDecl(ModuleT m, DeclT d)
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51 {
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52 (cast(Module)m).addDecl(cast(Decl)d);
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53 }
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54
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55 // -- Declarations --
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56 override DeclT actOnDeclarator(ref Id type, ref Id id, ExprT init)
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57 {
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58 Exp exp = cast(Exp)init;
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59 if(type.tok.type == Tok.Struct)
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60 return new StructDecl(identifierFromTok(id.tok));
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61 else
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62 return new VarDecl(handleType(type), identifierFromTok(id.tok), exp);
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63 }
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65 override void actOnStructMember(DeclT decl, ref Id type, ref Id name, ExprT init)
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66 {
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67 Exp exp = cast(Exp)init;
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68 StructDecl st = cast(StructDecl)decl;
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69 st.addMember(
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70 identifierFromTok(type.tok),
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71 identifierFromTok(name.tok),
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72 exp);
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73 }
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74
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75 override ExprT actOnMemberReference(ExprT lhs, SLoc op, Id member)
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76 {
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77 Exp exp = cast(Exp)lhs;
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78 Identifier id = identifierFromTok(member.tok);
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79 return new MemberReference(op, exp, id);
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80 }
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81
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82 override DeclT actOnStartOfFunctionDef(ref Id type, ref Id name)
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83 {
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84 return new FuncDecl(identifierFromTok(type.tok), identifierFromTok(name.tok));
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85 }
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86
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87 override void addFuncArg(DeclT func, Id type, Id name)
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88 {
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89 FuncDecl fd = cast(FuncDecl)func;
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90 if(name)
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91 fd.addParam(handleType(type), identifierFromTok(name.tok));
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92 else
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93 fd.addParam(identifierFromTok(type.tok));
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94 }
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95
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96 override DeclT actOnEndOfFunction(DeclT func, StmtT stmts)
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97 {
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98 FuncDecl fd = cast(FuncDecl)func;
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99 fd.setBody(cast(CompoundStatement)stmts);
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100 return fd;
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101 }
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102
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103 // -- Statements --
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104 override StmtT actOnCompoundStmt(ref Token l, ref Token r, StmtT[] stmts)
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105 {
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106 Stmt[] statements = cast(Stmt[])stmts;
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107 return new CompoundStatement(statements.dup);
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108 }
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109
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110 override StmtT actOnExprStmt(ExprT exp)
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111 {
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112 return new ExpStmt(cast(Exp)exp);
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113 }
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114
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115 override StmtT actOnReturnStmt(ref Token loc, ExprT exp)
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116 {
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117 Exp e = cast(Exp)exp;
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118 auto res = new ReturnStmt;
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119 res.exp = e;
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120 return res;
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121 }
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122
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123 override StmtT actOnIfStmt(ref Token ifTok, ExprT cond, StmtT thenBody,
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124 ref Token elseTok, StmtT elseBody)
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125 {
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126 Exp c = cast(Exp)cond;
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127 Stmt t = cast(Stmt)thenBody;
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128 Stmt e = cast(Stmt)elseBody;
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129 return new IfStmt(c, t, e);
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130 }
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131
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132 override StmtT actOnWhileStmt(ref Token tok, ExprT cond, StmtT whileBody)
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133 {
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134 Exp c = cast(Exp)cond;
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135 Stmt b = cast(Stmt)whileBody;
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136 return new WhileStmt(c, b);
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137 }
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138
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139 override StmtT actOnDeclStmt(DeclT decl)
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140 {
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141 Decl d = cast(Decl)decl;
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142 return new DeclStmt(d);
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143 }
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144
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145 // -- Expressions --
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146 override ExprT actOnNumericConstant(Token c)
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147 {
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148 return new IntegerLit(c.location, sm.getText(c.asRange));
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149 }
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150
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151 override ExprT actOnIdentifierExp(Id id)
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152 {
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153 return identifierFromTok(id.tok);
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154 }
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155
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156 override ExprT actOnBinaryOp(SLoc op_loc, Operator op, ExprT l, ExprT r)
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157 {
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158 Exp left = cast(Exp)l;
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159 Exp right = cast(Exp)r;
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160 if (op == Operator.Assign)
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161 return new AssignExp(op_loc, left, right);
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162 else
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163 {
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164 BinaryExp.Operator bin_op = cast(BinaryExp.Operator)op;
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165 return new BinaryExp(op_loc, bin_op, left, right);
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166 }
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167 }
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168
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169 override ExprT actOnUnaryOp(Token op, ExprT operand)
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170 {
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171 Exp target = cast(Exp)operand;
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172 if (op.type == Tok.Minus)
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173 return new NegateExp(op.location, target);
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174 if (op.type == Tok.Star)
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175 return new DerefExp(op.location, target);
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176 assert(0, "Only valid unary expressions are -x and *x");
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177 }
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178
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179 override ExprT actOnCallExpr(ExprT fn, ref Token, ExprT[] args, ref Token)
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180 {
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181 Exp f = cast(Exp)fn;
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182 Exp[] arguments = cast(Exp[])args.dup;
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183 return new CallExp(f, arguments);
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184 }
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185
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186 override ExprT actOnCastExpr(ref Token _cast, Id id, ExprT exp)
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187 {
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188 Exp target = cast(Exp)exp;
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189 Identifier target_type = identifierFromTok(id.tok);
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190 return new CastExp(_cast.location, target_type, target);
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191 }
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192
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193 override ExprT
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194 actOnIndexEpr(ExprT arr, ref Token lb, ExprT index, ref Token rb)
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195 {
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196 Exp target = cast(Exp)arr;
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197 Exp idx = cast(Exp)index;
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198 return new IndexExp(target, lb.location, idx, rb.location);
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199 }
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200 }
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201