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annotate sema/AstAction.d @ 51:c96cdcbdb9d6 new_gen

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Rearranged some stuff, and renamed LLVMGen -> CodeGen
author Anders Halager <halager@gmail.com>
date Sat, 26 Apr 2008 15:54:54 +0200
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children da551f90e03f
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51
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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
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9 import ast.Exp,
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10 ast.Stmt,
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11 ast.Decl;
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12
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13 public
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14 import parser.Action;
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15
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16 /**
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17 This class implements the default actions for Dang, by building up an AST
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18 with the data needed in a compiler.
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19 */
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20 class AstAction : Action
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21 {
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22 // -- Declarations --
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23 override DeclT actOnDeclarator(ref Id type, ref Id id, ExprT init)
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24 {
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25 Exp exp = cast(Exp)init;
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26 return new VarDecl(new Identifier(type.tok), new Identifier(id.tok), exp);
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27 }
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28
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29 override DeclT actOnStartOfFunctionDef(ref Id type, ref Id name)
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30 {
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31 return new FuncDecl(new Identifier(type.tok), new Identifier(name.tok));
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32 }
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33
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34 override void addFuncArg(DeclT func, Id type, Id name)
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35 {
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36 FuncDecl fd = cast(FuncDecl)func;
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37 fd.addParam(new Identifier(type.tok), new Identifier(name.tok));
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38 }
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39
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40 override DeclT actOnEndOfFunction(DeclT func, StmtT stmts)
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41 {
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42 FuncDecl fd = cast(FuncDecl)func;
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43 fd.setBody(cast(CompoundStatement)stmts);
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44 return fd;
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45 }
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46
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47 // -- Statements --
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48 override StmtT actOnCompoundStmt(ref Token l, ref Token r, StmtT[] stmts)
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49 {
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50 Stmt[] statements = cast(Stmt[])stmts;
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51 return new CompoundStatement(statements.dup);
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52 }
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53
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54 override StmtT actOnExprStmt(ExprT exp)
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55 {
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56 return new ExpStmt(cast(Exp)exp);
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57 }
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58
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59 override StmtT actOnReturnStmt(ref Token loc, ExprT exp)
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60 {
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61 Exp e = cast(Exp)exp;
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62 auto res = new ReturnStmt;
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63 res.exp = e;
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64 return res;
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65 }
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66
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67 override StmtT actOnIfStmt(ref Token ifTok, ExprT cond, StmtT thenBody,
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68 ref Token elseTok, StmtT elseBody)
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69 {
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70 Exp c = cast(Exp)cond;
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71 Stmt t = cast(Stmt)thenBody;
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72 Stmt e = cast(Stmt)elseBody;
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73 return new IfStmt(c, t, e);
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74 }
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75
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76 override StmtT actOnWhileStmt(ref Token tok, ExprT cond, StmtT whileBody)
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77 {
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78 Exp c = cast(Exp)cond;
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79 Stmt b = cast(Stmt)whileBody;
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80 return new WhileStmt(c, b);
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81 }
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82
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83 override StmtT actOnDeclStmt(DeclT decl)
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84 {
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85 Decl d = cast(Decl)decl;
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86 return new DeclStmt(d);
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87 }
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88
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89 // -- Expressions --
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90 override ExprT actOnNumericConstant(Token c)
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91 {
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92 return new IntegerLit(c);
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93 }
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94
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95 override ExprT actOnIdentifierExp(Id id)
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96 {
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97 return new Identifier(id.tok);
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98 }
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99
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100 override ExprT actOnBinaryOp(Operator op, ExprT l, ExprT r)
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101 {
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102 Exp left = cast(Exp)l;
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103 Exp right = cast(Exp)r;
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104 if (op == Operator.Assign)
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105 return new AssignExp(left, right);
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106 else
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107 return new BinaryExp(cast(BinaryExp.Operator)op, left, right);
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108 }
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109
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110 override ExprT actOnUnaryOp(Token op, ExprT operand)
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111 {
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112 Exp target = cast(Exp)operand;
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113 // can only be -x for now
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114 return new NegateExp(target);
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115 }
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116
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117 override ExprT actOnCallExpr(ExprT fn, ref Token, ExprT[] args, ref Token)
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118 {
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119 Exp f = cast(Exp)fn;
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120 Exp[] arguments = cast(Exp[])args.dup;
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121 return new CallExp(f, arguments);
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122 }
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123 }