IR生成文件即IRGenxx设计

src/irgen/IRGenStmt.cpp

@@ -2,3 +2,18 @@
 // - 处理 if/while/return 等控制流构造
 // - 负责基本块创建、分支跳转与控制流收束
 
+#include "irgen/IRGen.h"
+
+#include <stdexcept>
+
+#include "ast/AstNodes.h"
+#include "ir/IR.h"
+
+void IRGenImpl::GenStmt(const ast::Stmt& stmt) {
+  if (auto ret = dynamic_cast<const ast::ReturnStmt*>(&stmt)) {
+    ir::Value* v = GenExpr(*ret->value);
+    builder_.CreateRet(v);
+    return;
+  }
+  throw std::runtime_error("不支持的语句类型");
+}