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annotate sema/AstAction.d @ 114:3a0cd42de9cc

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Removed misc/Error.d and is now using the error system all way through.
author Anders Johnsen <skabet@gmail.com>
date Sun, 25 May 2008 16:40:38 +0200
parents 7ff4bc2accf2
children c3b24e7e8cf8
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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 basic.SourceManager;
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8
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9 import ast.Module,
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10 ast.Exp,
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11 ast.Stmt,
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12 ast.Decl;
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13
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14 public
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15 import parser.Action;
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16
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17 /**
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18 This class implements the default actions for Dang, by building up an AST
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19 with the data needed in a compiler.
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20 */
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21 class AstAction : Action
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22 {
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23 this(SourceManager sm)
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24 {
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25 this.sm = sm;
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26 }
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27 private SourceManager sm;
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28
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29 private Identifier handleType(Id type)
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30 {
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31 if(auto t = cast(PointerId)type)
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32 return new PointerIdentifier(handleType(t.id));
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33 if(auto t = cast(ArrayId)type)
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34 return new ArrayIdentifier(handleType(t.id), cast(IntegerLit)t.number);
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35 else
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36 return identifierFromTok(type.tok);
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37 }
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38
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39 private Identifier identifierFromTok(Token t)
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40 {
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41 return new Identifier(t.location, sm.getText(t.asRange));
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42 }
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43
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44 override ModuleT actOnModule(ref Token _module, char[] name)
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45 {
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46 return new Module(name);
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47 }
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48
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49 override ModuleT actOnImplicitModule(SLoc startLoc, char[] name)
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50 {
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51 return new Module(name);
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52 }
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53
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54 override void actOnModuleDecl(ModuleT m, DeclT d)
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55 {
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56 (cast(Module)m).addDecl(cast(Decl)d);
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57 }
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58
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59 // -- Declarations --
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60 override DeclT actOnImport(ref Token _, ref ModuleName target, Id* name)
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61 {
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62 auto res = new ImportDecl;
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63 Identifier[] packages = new Identifier[target.packages.length];
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64 foreach (i, v; target.packages)
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65 packages[i] = identifierFromTok(v.tok);
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66 res.packages = packages;
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67
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68 res.name = identifierFromTok(target.id.tok);
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69 if (name !is null)
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70 res.aliasedName = identifierFromTok(name.tok);
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71 return res;
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72 }
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73
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74 override void addSelectiveImport(DeclT _import, ref Id target, Id* name)
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75 {
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76 auto d = cast(ImportDecl)_import;
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77 Identifier t = identifierFromTok(target.tok);
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78 Identifier n = t;
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79 if (name !is null)
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80 n = identifierFromTok(name.tok);
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81 d.explicitSymbols ~= [t, n];
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82 }
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83
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84 override DeclT actOnDeclarator(ref Id type, ref Id id, ExprT init)
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85 {
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86 Exp exp = cast(Exp)init;
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87 if(type.tok.type == Tok.Struct)
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88 return new StructDecl(identifierFromTok(id.tok));
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89 else
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90 return new VarDecl(handleType(type), identifierFromTok(id.tok), exp);
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91 }
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92
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93 override void actOnStructMember(DeclT st_decl, DeclT m_decl) //ref Id type, ref Id name, ExprT init)
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94 {
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95 StructDecl st = cast(StructDecl)st_decl;
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96 st.addMember(cast(Decl)m_decl);
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97 }
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98
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99 override ExprT actOnMemberReference(ExprT lhs, SLoc op, Id member)
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100 {
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101 Exp exp = cast(Exp)lhs;
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102 Identifier id = identifierFromTok(member.tok);
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103 return new MemberReference(op, exp, id);
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104 }
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105
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106 override DeclT actOnStartOfFunctionDef(ref Id type, ref Id name)
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107 {
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108 return new FuncDecl(identifierFromTok(type.tok), identifierFromTok(name.tok));
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109 }
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110
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111 override void addFuncArg(DeclT func, Id type, Id name)
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112 {
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113 FuncDecl fd = cast(FuncDecl)func;
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114 if(name)
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115 fd.addParam(handleType(type), identifierFromTok(name.tok));
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116 else
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117 fd.addParam(identifierFromTok(type.tok));
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118 }
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119
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120 override DeclT actOnEndOfFunction(DeclT func, StmtT stmts)
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121 {
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122 FuncDecl fd = cast(FuncDecl)func;
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123 fd.setBody(cast(CompoundStatement)stmts);
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124 return fd;
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125 }
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126
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127 // -- Statements --
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128 override StmtT actOnCompoundStmt(ref Token l, ref Token r, StmtT[] stmts)
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129 {
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130 Stmt[] statements = cast(Stmt[])stmts;
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131 return new CompoundStatement(statements.dup);
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132 }
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133
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134 override StmtT actOnExprStmt(ExprT exp)
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135 {
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136 return new ExpStmt(cast(Exp)exp);
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137 }
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138
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139 override StmtT actOnReturnStmt(ref Token loc, ExprT exp)
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140 {
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141 Exp e = cast(Exp)exp;
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142 auto res = new ReturnStmt;
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143 res.exp = e;
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144 return res;
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145 }
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146
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147 override StmtT actOnIfStmt(ref Token ifTok, ExprT cond, StmtT thenBody,
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148 ref Token elseTok, StmtT elseBody)
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149 {
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150 Exp c = cast(Exp)cond;
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151 Stmt t = cast(Stmt)thenBody;
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152 Stmt e = cast(Stmt)elseBody;
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153 return new IfStmt(c, t, e);
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154 }
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155
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156 override StmtT actOnWhileStmt(ref Token tok, ExprT cond, StmtT whileBody)
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157 {
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158 Exp c = cast(Exp)cond;
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159 Stmt b = cast(Stmt)whileBody;
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160 return new WhileStmt(c, b);
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161 }
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162
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163 override StmtT actOnDeclStmt(DeclT decl)
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164 {
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165 Decl d = cast(Decl)decl;
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166 return new DeclStmt(d);
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167 }
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168
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169 // -- Expressions --
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170 override ExprT actOnNumericConstant(Token c)
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171 {
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172 return new IntegerLit(c.location, sm.getText(c.asRange));
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173 }
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174
104
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175 override ExprT actOnStringExp(Token s)
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176 {
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177 return new StringExp(s.location, sm.getText(s.asRange));
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178 }
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179
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180 override ExprT actOnIdentifierExp(Id id)
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181 {
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182 return identifierFromTok(id.tok);
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183 }
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184
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185 override ExprT actOnBinaryOp(SLoc op_loc, Operator op, ExprT l, ExprT r)
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186 {
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187 Exp left = cast(Exp)l;
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188 Exp right = cast(Exp)r;
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189 if (op == Operator.Assign)
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190 return new AssignExp(op_loc, left, right);
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191 else
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192 {
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193 BinaryExp.Operator bin_op = cast(BinaryExp.Operator)op;
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194 return new BinaryExp(op_loc, bin_op, left, right);
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195 }
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196 }
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197
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198 override ExprT actOnUnaryOp(Token op, ExprT operand)
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199 {
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200 Exp target = cast(Exp)operand;
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201 if (op.type == Tok.Minus)
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202 return new NegateExp(op.location, target);
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203 if (op.type == Tok.Star)
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204 return new DerefExp(op.location, target);
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205 assert(0, "Only valid unary expressions are -x and *x");
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206 }
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207
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208 override ExprT actOnCallExpr(ExprT fn, ref Token, ExprT[] args, ref Token)
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209 {
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210 Exp f = cast(Exp)fn;
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211 Exp[] arguments = cast(Exp[])args.dup;
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212 return new CallExp(f, arguments);
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213 }
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214
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215 override ExprT actOnCastExpr(ref Token _cast, Id id, ExprT exp)
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216 {
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217 Exp target = cast(Exp)exp;
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218 Identifier target_type = identifierFromTok(id.tok);
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219 return new CastExp(_cast.location, target_type, target);
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220 }
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221
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222 override ExprT
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223 actOnIndexEpr(ExprT arr, ref Token lb, ExprT index, ref Token rb)
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224 {
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225 Exp target = cast(Exp)arr;
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226 Exp idx = cast(Exp)index;
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227 return new IndexExp(target, lb.location, idx, rb.location);
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228 }
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229 }
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230