Revert "可以处理生成加法的IR"

src/ast/AstNodes.h

@@ -1,70 +0,0 @@
-// Minimal AST definitions for the SysY subset used in this toy compiler.
-#pragma once
-
-#include <memory>
-#include <string>
-#include <vector>
-
-namespace ast {
-
-enum class BinaryOp { Add, Sub, Mul, Div };
-
-struct Expr {
-  virtual ~Expr() = default;
-};
-
-struct NumberExpr : Expr {
-  int value{};
-  explicit NumberExpr(int v) : value(v) {}
-};
-
-struct VarExpr : Expr {
-  std::string name;
-  explicit VarExpr(std::string n) : name(std::move(n)) {}
-};
-
-struct BinaryExpr : Expr {
-  BinaryOp op;
-  std::shared_ptr<Expr> lhs;
-  std::shared_ptr<Expr> rhs;
-  BinaryExpr(BinaryOp op, std::shared_ptr<Expr> lhs, std::shared_ptr<Expr> rhs)
-      : op(op), lhs(std::move(lhs)), rhs(std::move(rhs)) {}
-};
-
-struct Stmt {
-  virtual ~Stmt() = default;
-};
-
-struct ReturnStmt : Stmt {
-  std::shared_ptr<Expr> value;
-  explicit ReturnStmt(std::shared_ptr<Expr> v) : value(std::move(v)) {}
-};
-
-struct VarDecl {
-  std::string name;
-  std::shared_ptr<Expr> init;  // nullptr if no initializer
-  VarDecl(std::string n, std::shared_ptr<Expr> i)
-      : name(std::move(n)), init(std::move(i)) {}
-};
-
-struct Block {
-  std::vector<std::shared_ptr<VarDecl>> varDecls;
-  std::vector<std::shared_ptr<Stmt>> stmts;
-};
-
-struct FuncDef {
-  std::string name;
-  std::shared_ptr<Block> body;
-  FuncDef(std::string n, std::shared_ptr<Block> b)
-      : name(std::move(n)), body(std::move(b)) {}
-};
-
-struct CompUnit {
-  std::shared_ptr<FuncDef> func;
-  explicit CompUnit(std::shared_ptr<FuncDef> f) : func(std::move(f)) {}
-};
-
-// 调试打印
-void PrintAST(const CompUnit& cu);
-
-}  // namespace ast