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Implementing a Domain-Specific Language (DSL) with LLVM and C++

Tutorial February 12, 2025

Header: AST.h

#ifndef DSL_AST_H
#define DSL_AST_H

#include <memory>
#include <llvm/IR/Value.h>
#include <llvm/IR/IRBuilder.h>

// Base class for all expression nodes.
class ASTNode {
public:
    virtual ~ASTNode() = default;
    virtual llvm::Value* codegen(llvm::IRBuilder<>& builder) = 0;
};

// Expression for numeric literals.
class NumberExprAST : public ASTNode {
public:
    NumberExprAST(double value) : value(value) {}
    llvm::Value* codegen(llvm::IRBuilder<>& builder) override;

private:
    double value;
};

// Expression for a binary operator.
class BinaryExprAST : public ASTNode {
public:
    BinaryExprAST(llvm::TokenType op, std::unique_ptr<ASTNode> lhs,
                  std::unique_ptr<ASTNode> rhs)
        : op(op), lhs(std::move(lhs)), rhs(std::move(rhs)) {}
    llvm::Value* codegen(llvm::IRBuilder<>& builder) override;

private:
    TokenType op;
    std::unique_ptr<ASTNode> lhs, rhs;
};

#endif // DSL_AST_H

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