From 690146e3115f615818ec6927eb56fab157221504 Mon Sep 17 00:00:00 2001
From: Tony <68118705+Legend-Master@users.noreply.github.com>
Date: Tue, 15 Apr 2025 05:52:23 +0800
Subject: [PATCH] fix(macros): invoke handler stack overflow (#13217)

* Fix invoke handler stack overflow

* Format and inline iife in release build

* Add change file

* The comment should be one level up
---
 .../invoke-handler-stack-overflow-on-debug.md |  5 ++++
 crates/tauri-macros/src/command/wrapper.rs    | 27 ++++++++++++-------
 2 files changed, 22 insertions(+), 10 deletions(-)
 create mode 100644 .changes/invoke-handler-stack-overflow-on-debug.md

diff --git a/.changes/invoke-handler-stack-overflow-on-debug.md b/.changes/invoke-handler-stack-overflow-on-debug.md
new file mode 100644
index 000000000..5f89ae2f1
--- /dev/null
+++ b/.changes/invoke-handler-stack-overflow-on-debug.md
@@ -0,0 +1,5 @@
+---
+tauri: patch:bug
+---
+
+Fix large number of commands with large structs as parameters causing stack overflow on debug build on Windows
diff --git a/crates/tauri-macros/src/command/wrapper.rs b/crates/tauri-macros/src/command/wrapper.rs
index 768cb8c62..683e9f6f5 100644
--- a/crates/tauri-macros/src/command/wrapper.rs
+++ b/crates/tauri-macros/src/command/wrapper.rs
@@ -280,18 +280,25 @@ pub fn wrapper(attributes: TokenStream, item: TokenStream) -> TokenStream {
     #maybe_macro_export
     #[doc(hidden)]
     macro_rules! #wrapper {
-        // double braces because the item is expected to be a block expression
-        ($path:path, $invoke:ident) => {{
-          #[allow(unused_imports)]
-          use #root::ipc::private::*;
-          // prevent warnings when the body is a `compile_error!` or if the command has no arguments
-          #[allow(unused_variables)]
-          let #root::ipc::Invoke { message: #message, resolver: #resolver, acl: #acl } = $invoke;
+      // double braces because the item is expected to be a block expression
+      ($path:path, $invoke:ident) => {
+        // The IIFE here is for preventing stack overflow on Windows debug build,
+        // see https://github.com/tauri-apps/tauri/issues/12488
+        {
+          #[cfg_attr(not(debug_assertions), inline(always))]
+          move || {
+            #[allow(unused_imports)]
+            use #root::ipc::private::*;
+            // prevent warnings when the body is a `compile_error!` or if the command has no arguments
+            #[allow(unused_variables)]
+            let #root::ipc::Invoke { message: #message, resolver: #resolver, acl: #acl } = $invoke;
 
-          #maybe_span
+            #maybe_span
 
-          #body
-      }};
+            #body
+          }
+        }()
+      };
     }
 
     // allow the macro to be resolved with the same path as the command function