CodeGenerator.hpp

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#ifndef LLVMEXPR_FRONTEND_INFIX2POSTFIX_CODEGENERATOR_HPP
#define LLVMEXPR_FRONTEND_INFIX2POSTFIX_CODEGENERATOR_HPP
 
#include "AST.hpp"
#include "PostfixBuilder.hpp"
#include "types.hpp"
 
#include <format>
#include <map>
#include <set>
#include <stdexcept>
#include <string>
#include <vector>
 
namespace infix2postfix {
 
struct BuiltinFunction; // Forward declaration
 
class CodeGenError : public std::runtime_error {
  public:
    Range range;
    CodeGenError(const std::string& message, const Range& r)
        : std::runtime_error(std::format(": {}", r.to_string(), message)),
          range(r) {}
};
 
class CodeGenerator {
  public:
    struct ExprResult {
        PostfixBuilder postfix;
        Type type;
    };
 
    CodeGenerator(Mode mode, int num_inputs, int num_intermediate_inputs = 0);
 
    std::string generate(const Program* program);
 
    [[nodiscard]] Mode getMode() const { return mode; }
    ExprResult generateExpr(Expr* expr);
 
  private:
    Type generate(Expr* expr, PostfixBuilder& builder);
    void generate(Stmt* stmt, PostfixBuilder& builder);
    std::string generateExprToString(Expr* expr);
 
    // Expression handlers
    Type handle(const NumberExpr& expr, PostfixBuilder& builder);
    Type handle(const VariableExpr& expr, PostfixBuilder& builder);
    Type handle(const UnaryExpr& expr, PostfixBuilder& builder);
    Type handle(const BinaryExpr& expr, PostfixBuilder& builder);
    Type handle(const TernaryExpr& expr, PostfixBuilder& builder);
    Type handle(const CallExpr& expr, PostfixBuilder& builder);
    Type handle(const PropAccessExpr& expr, PostfixBuilder& builder);
    Type handle(const StaticRelPixelAccessExpr& expr, PostfixBuilder& builder);
    Type handle(const FrameDimensionExpr& expr, PostfixBuilder& builder);
    Type handle(const ArrayAccessExpr& expr, PostfixBuilder& builder);
 
    // Statement handlers
    void handle(const ExprStmt& stmt, PostfixBuilder& builder);
    void handle(const AssignStmt& stmt, PostfixBuilder& builder);
    void handle(const BlockStmt& stmt, PostfixBuilder& builder);
    void handle(const IfStmt& stmt, PostfixBuilder& builder);
    void handle(const WhileStmt& stmt, PostfixBuilder& builder);
    void handle(const ReturnStmt& stmt, PostfixBuilder& builder);
    void handle(const LabelStmt& stmt, PostfixBuilder& builder);
    void handle(const GotoStmt& stmt, PostfixBuilder& builder);
    void handle(const FunctionDef& stmt, PostfixBuilder& builder);
    void handle(const GlobalDecl& stmt, PostfixBuilder& builder);
    void handle(const ArrayAssignStmt& stmt, PostfixBuilder& builder);
 
    void checkStackEffect(const std::string& s, int expected,
                          const Range& range);
    int computeStackEffect(const std::string& s, const Range& range);
    Expr* resolveParamSubstitution(Expr* expr) const;
 
    void inlineFunctionCall(const FunctionSignature& sig, FunctionDef* func_def,
                            const std::vector<std::unique_ptr<Expr>>& args,
                            const Range& call_range, PostfixBuilder& builder);
 
    Mode mode;
    int num_inputs;
    int num_intermediate_inputs;
    int label_counter = 0;
    int call_site_counter = 0;
 
    std::map<std::string, Expr*> param_substitutions;
    std::map<std::string, std::string> var_rename_map;
    const FunctionSignature* current_function = nullptr;
    std::vector<int> call_site_id_stack;
 
    std::set<std::string> current_function_labels;
};
 
} // namespace infix2postfix
 
#endif // LLVMEXPR_FRONTEND_INFIX2POSTFIX_CODEGENERATOR_HPP