The error recovery in our parser will not be the best and is not particular user-friendly, but it will be enough for our tutorial. Note that instead of adding virtual methods to the ExprAST class hierarchy, it could also make sense to use a visitor pattern or some other way to model this. Again, this tutorial won’t dwell on good software engineering practices: for our purposes, adding a virtual method is simplest.
ߏจͷϊʔυΫϥε /// ExprAST - Base class for all expression nodes. class ExprAST { public: virtual ~ExprAST() {} }; /// NumberExprAST - Expression class for numeric literals like "1.0". class NumberExprAST : public ExprAST { double Val; public: NumberExprAST(double Val) : Val(Val) {} }; Λอଘ͢Δϊʔυ
ؔͷϓϩτλΠϓએݴ /// PrototypeAST - This class represents the "prototype" for a function, /// which captures its name, and its argument names (thus implicitly the number /// of arguments the function takes). class PrototypeAST { std::string Name; std::vector Args; public: PrototypeAST(const std::string &name, std::vector Args) : Name(name), Args(std::move(Args)) {} const std::string &getName() const { return Name; } }; ؔͷ໊લɼҾͷ໊લͷϦετ͕ϓϩύςΟɽ ʢී௨ܕͷϦετͷඞཁʣ
ؔͷϓϩτλΠϓએݴ /// FunctionAST - This class represents a function definition itself. class FunctionAST { std::unique_ptr Proto; std::unique_ptr Body; public: FunctionAST(std::unique_ptr Proto, std::unique_ptr Body) : Proto(std::move(Proto)), Body(std::move(Body)) {} }; ؔͷ࣮ɽ ϓϩτλΠϓͷϙΠϯλͱؔͷ࣮ຊମͷϙΠϯλ
ιʔε͔ΒؤுͬͯΛ࡞͍ͬͯ͘ /// numberexpr ::= number static std::unique_ptr ParseNumberExpr() { auto Result = llvm::make_unique(NumVal); getNextToken(); // consume the number return std::move(Result); } NumVal͕άϩʔόϧมͰɼgetNextToken()Ͱ άϩʔόϧมʹ࣍ͷτʔΫϯΛಡΈࠐΉ ͭ·ΓɼԚ͍
ιʔε͔ΒؤுͬͯΛ࡞͍ͬͯ͘ auto LHS = llvm::make_unique("x"); auto RHS = llvm::make_unique("y"); auto Result = std::make_unique('+', std::move(LHS), std::move(RHS));
LLVM IRΛੜ͢Δ • ͖͞΄ͲͷϊʔυʹcodegenΛੜ͢ /// ExprAST - Base class for all expression nodes. class ExprAST { public: virtual ~ExprAST() {} virtual Value *codegen() = 0; }; /// NumberExprAST - Expression class for numeric literals like "1.0". class NumberExprAST : public ExprAST { double Val; public: NumberExprAST(double Val) : Val(Val) {} virtual Value *codegen(); }; ValueɾɾɾStatic Single Assignment RegisterΛࣔ͢ม
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