refactor(dev): 移动头文件位置

include/irgen/IRGen.h

@@ -0,0 +1,49 @@
+// 将语法树翻译为 IR。
+// 实现拆分在 IRGenFunc/IRGenStmt/IRGenExp/IRGenDecl。
+
+#pragma once
+
+#include <memory>
+#include <string>
+#include <unordered_map>
+
+#include "SysYParser.h"
+#include "ir/IR.h"
+#include "sem/Sema.h"
+
+namespace ir {
+class Module;
+class Function;
+class IRBuilder;
+class Value;
+}
+
+class IRGenImpl {
+ public:
+  IRGenImpl(ir::Module& module, const SemanticContext& sema);
+
+  void Gen(SysYParser::CompUnitContext& cu);
+
+ private:
+  void GenFuncDef(SysYParser::FuncDefContext& func);
+  void GenBlock(SysYParser::BlockContext& block);
+  bool GenBlockItem(SysYParser::BlockItemContext& item);
+  void GenDecl(SysYParser::DeclContext& decl);
+  bool GenStmt(SysYParser::StmtContext& stmt);
+  void GenVarDecl(SysYParser::VarDeclContext& decl);
+  void GenReturnStmt(SysYParser::ReturnStmtContext& ret);
+
+  ir::Value* GenExpr(SysYParser::ExpContext& expr);
+  ir::Value* GenAddExpr(SysYParser::AddExpContext& add);
+  ir::Value* GenPrimary(SysYParser::PrimaryContext& primary);
+
+  ir::Module& module_;
+  const SemanticContext& sema_;
+  ir::Function* func_;
+  ir::IRBuilder builder_;
+  // 名称绑定由 Sema 负责；IRGen 只维护“声明 -> 存储槽位”的代码生成状态。
+  std::unordered_map<SysYParser::VarDeclContext*, ir::Value*> storage_map_;
+};
+
+std::unique_ptr<ir::Module> GenerateIR(SysYParser::CompUnitContext& tree,
+                                       const SemanticContext& sema);