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annotate sema/AstAction.d @ 53:da551f90e03f new_gen

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Added struct decl and forward ref. A note on structs: they need to make a new scope when declared. Otherwise you could access struct members as globals
author Anders Johnsen <skabet@gmail.com>
date Sat, 26 Apr 2008 18:52:27 +0200
parents c96cdcbdb9d6
children 79cb0afafabe
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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 if(type.tok.type == Tok.Struct)
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27 return new StructDecl(new Identifier(id.tok));
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28 else
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29 return new VarDecl(new Identifier(type.tok), new Identifier(id.tok), exp);
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30 }
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31
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32 override void actOnStructMember(DeclT decl, ref Id type, ref Id name, ExprT init)
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33 {
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34 Exp exp = cast(Exp)init;
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35 StructDecl st = cast(StructDecl)decl;
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36 st.addMember(
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37 new Identifier(type.tok),
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38 new Identifier(name.tok),
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39 exp);
51
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40 }
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41
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42 override DeclT actOnStartOfFunctionDef(ref Id type, ref Id name)
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43 {
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44 return new FuncDecl(new Identifier(type.tok), new Identifier(name.tok));
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45 }
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46
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47 override void addFuncArg(DeclT func, Id type, Id name)
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48 {
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49 FuncDecl fd = cast(FuncDecl)func;
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50 fd.addParam(new Identifier(type.tok), new Identifier(name.tok));
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51 }
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52
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53 override DeclT actOnEndOfFunction(DeclT func, StmtT stmts)
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54 {
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55 FuncDecl fd = cast(FuncDecl)func;
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56 fd.setBody(cast(CompoundStatement)stmts);
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57 return fd;
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58 }
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59
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60 // -- Statements --
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61 override StmtT actOnCompoundStmt(ref Token l, ref Token r, StmtT[] stmts)
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62 {
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63 Stmt[] statements = cast(Stmt[])stmts;
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64 return new CompoundStatement(statements.dup);
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65 }
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66
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67 override StmtT actOnExprStmt(ExprT exp)
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68 {
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69 return new ExpStmt(cast(Exp)exp);
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70 }
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71
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72 override StmtT actOnReturnStmt(ref Token loc, ExprT exp)
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73 {
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74 Exp e = cast(Exp)exp;
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75 auto res = new ReturnStmt;
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76 res.exp = e;
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77 return res;
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78 }
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79
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80 override StmtT actOnIfStmt(ref Token ifTok, ExprT cond, StmtT thenBody,
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81 ref Token elseTok, StmtT elseBody)
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82 {
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83 Exp c = cast(Exp)cond;
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84 Stmt t = cast(Stmt)thenBody;
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85 Stmt e = cast(Stmt)elseBody;
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86 return new IfStmt(c, t, e);
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87 }
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88
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89 override StmtT actOnWhileStmt(ref Token tok, ExprT cond, StmtT whileBody)
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90 {
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91 Exp c = cast(Exp)cond;
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92 Stmt b = cast(Stmt)whileBody;
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93 return new WhileStmt(c, b);
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94 }
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95
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96 override StmtT actOnDeclStmt(DeclT decl)
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97 {
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98 Decl d = cast(Decl)decl;
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99 return new DeclStmt(d);
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100 }
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101
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102 // -- Expressions --
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103 override ExprT actOnNumericConstant(Token c)
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104 {
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105 return new IntegerLit(c);
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106 }
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107
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108 override ExprT actOnIdentifierExp(Id id)
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109 {
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110 return new Identifier(id.tok);
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111 }
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112
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113 override ExprT actOnBinaryOp(Operator op, ExprT l, ExprT r)
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114 {
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115 Exp left = cast(Exp)l;
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116 Exp right = cast(Exp)r;
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117 if (op == Operator.Assign)
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118 return new AssignExp(left, right);
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119 else
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120 return new BinaryExp(cast(BinaryExp.Operator)op, left, right);
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121 }
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122
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123 override ExprT actOnUnaryOp(Token op, ExprT operand)
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124 {
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125 Exp target = cast(Exp)operand;
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126 // can only be -x for now
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127 return new NegateExp(target);
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128 }
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129
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130 override ExprT actOnCallExpr(ExprT fn, ref Token, ExprT[] args, ref Token)
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131 {
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132 Exp f = cast(Exp)fn;
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133 Exp[] arguments = cast(Exp[])args.dup;
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134 return new CallExp(f, arguments);
c96cdcbdb9d6 Rearranged some stuff, and renamed LLVMGen -> CodeGen
Anders Halager <halager@gmail.com>
parents:
diff changeset
135 }
c96cdcbdb9d6 Rearranged some stuff, and renamed LLVMGen -> CodeGen
Anders Halager <halager@gmail.com>
parents:
diff changeset
136 }