diff --git a/src/include/IR.h b/src/include/IR.h
index f1759cd..60db35a 100644
--- a/src/include/IR.h
+++ b/src/include/IR.h
@@ -188,24 +188,6 @@ class Use {
   void setValue(Value *newValue) { value = newValue; }  ///< 将被使用的值设置为newValue
 };
 
-template <typename T>
-inline std::enable_if_t<std::is_base_of_v<Value, T>, bool>
-isa(const Value *value) {
-  return T::classof(value);
-}
-
-template <typename T>
-inline std::enable_if_t<std::is_base_of_v<Value, T>, T *>
-dyncast(Value *value) {
-  return isa<T>(value) ? static_cast<T *>(value) : nullptr;
-}
-
-template <typename T>
-inline std::enable_if_t<std::is_base_of_v<Value, T>, const T *>
-dyncast(const Value *value) {
-  return isa<T>(value) ? static_cast<const T *>(value) : nullptr;
-}
-
 //! The base class of all value types
 
 class Value {
@@ -1001,7 +983,7 @@ protected:
   }
 
 public:
-  BasicBlock *getBlock() const { return dyncast<BasicBlock>(getOperand(0)); }
+  BasicBlock *getBlock() const { return dynamic_cast<BasicBlock *>(getOperand(0)); }
   auto getArguments() const {
     return make_range(std::next(operand_begin()), operand_end());
   }
@@ -1029,10 +1011,10 @@ protected:
 public:
   Value *getCondition() const { return getOperand(0); }
   BasicBlock *getThenBlock() const {
-    return dyncast<BasicBlock>(getOperand(1));
+    return dynamic_cast<BasicBlock *>(getOperand(1));
   }
   BasicBlock *getElseBlock() const {
-    return dyncast<BasicBlock>(getOperand(2));
+    return dynamic_cast<BasicBlock *>(getOperand(2));
   }
   auto getThenArguments() const {
     auto begin = std::next(operand_begin(), 3);
@@ -1213,6 +1195,8 @@ public:
 
 };
 
+class GlobalValue;
+
 // 循环类
 class Loop {
 public:
@@ -1658,6 +1642,7 @@ class Module {
     }
     return result.first->second.get();
   }  ///< 创建外部函数
+  ///< 变量创建伴随着符号表的更新
   auto createGlobalValue(const std::string &name, Type *type, const std::vector<Value *> &dims = {},
                          const ValueCounter &init = {}) -> GlobalValue * {
     bool isFinished = variableTable.isCurNodeNull();
diff --git a/src/include/SysYIRGenerator.h b/src/include/SysYIRGenerator.h
index b4ead27..a5f5a91 100644
--- a/src/include/SysYIRGenerator.h
+++ b/src/include/SysYIRGenerator.h
@@ -71,7 +71,7 @@ public:
   std::any visitGlobalConstDecl(SysYParser::GlobalConstDeclContext *ctx) override;
   std::any visitGlobalVarDecl(SysYParser::GlobalVarDeclContext *ctx) override;
 
-  std::any visitDecl(SysYParser::DeclContext *ctx) override ;
+  // std::any visitDecl(SysYParser::DeclContext *ctx) override;
   std::any visitConstDecl(SysYParser::ConstDeclContext *ctx) override;
   std::any visitVarDecl(SysYParser::VarDeclContext *ctx) override;