From 7e9e5bf872f7866619343c14208a7f1fba6f5094 Mon Sep 17 00:00:00 2001
From: Andrey Kleshchev <andreykproductengine@lindenlab.com>
Date: Wed, 12 Mar 2025 16:03:37 +0200
Subject: #3591 Restructure SE to not catch LLContinueError

It was reporting shutdown as crashes to bugsplat
---
 indra/llcommon/llcoros.cpp | 46 +++++++++++++++++++++++++++++++---------------
 1 file changed, 31 insertions(+), 15 deletions(-)

diff --git a/indra/llcommon/llcoros.cpp b/indra/llcommon/llcoros.cpp
index ea2d102de9..9e95d9c85f 100644
--- a/indra/llcommon/llcoros.cpp
+++ b/indra/llcommon/llcoros.cpp
@@ -331,12 +331,34 @@ U32 exception_filter(U32 code, struct _EXCEPTION_POINTERS* exception_infop)
     return EXCEPTION_CONTINUE_SEARCH;
 }
 
-void sehandle(const LLCoros::callable_t& callable)
+void cpphandle(const LLCoros::callable_t& callable, const std::string& name)
 {
-    __try
+    // SE and C++ can not coexists, thus two handlers
+    try
     {
         callable();
     }
+    catch (const LLCoros::Stop& exc)
+    {
+        LL_INFOS("LLCoros") << "coroutine " << name << " terminating because "
+            << exc.what() << LL_ENDL;
+    }
+    catch (const LLContinueError&)
+    {
+        // Any uncaught exception derived from LLContinueError will be caught
+        // here and logged. This coroutine will terminate but the rest of the
+        // viewer will carry on.
+        LOG_UNHANDLED_EXCEPTION(STRINGIZE("coroutine " << name));
+    }
+}
+
+void sehandle(const LLCoros::callable_t& callable, const std::string& name)
+{
+    __try
+    {
+        // handle stop and continue exceptions first
+        cpphandle(callable, name);
+    }
     __except (exception_filter(GetExceptionCode(), GetExceptionInformation()))
     {
         // convert to C++ styled exception
@@ -347,16 +369,7 @@ void sehandle(const LLCoros::callable_t& callable)
         throw std::exception(integer_string);
     }
 }
-
-#else  // ! LL_WINDOWS
-
-inline void sehandle(const LLCoros::callable_t& callable)
-{
-    callable();
-}
-
-#endif // ! LL_WINDOWS
-
+#endif // LL_WINDOWS
 } // anonymous namespace
 
 // Top-level wrapper around caller's coroutine callable.
@@ -369,10 +382,14 @@ void LLCoros::toplevel(std::string name, callable_t callable)
     // set it as current
     mCurrent.reset(&corodata);
 
+#ifdef LL_WINDOWS
+    // can not use __try directly, toplevel requires unwinding, thus use of a wrapper
+    sehandle(callable, name);
+#else // LL_WINDOWS
     // run the code the caller actually wants in the coroutine
     try
     {
-        sehandle(callable);
+        callable();
     }
     catch (const Stop& exc)
     {
@@ -386,7 +403,6 @@ void LLCoros::toplevel(std::string name, callable_t callable)
         // viewer will carry on.
         LOG_UNHANDLED_EXCEPTION(STRINGIZE("coroutine " << name));
     }
-#ifndef LL_WINDOWS
     catch (...)
     {
         // Stash any OTHER kind of uncaught exception in the rethrow() queue
@@ -395,7 +411,7 @@ void LLCoros::toplevel(std::string name, callable_t callable)
                             << name << LL_ENDL;
         LLCoros::instance().saveException(name, std::current_exception());
     }
-#endif // ! LL_WINDOWS
+#endif // else LL_WINDOWS
 }
 
 //static
-- 
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