From 696b8ae3e4aa434d81ec7fcfb3bd99611e3077fd Mon Sep 17 00:00:00 2001
From: Jeremy Rose <nornagon@nornagon.net>
Date: Tue, 20 Feb 2024 00:54:10 -0800
Subject: [PATCH] Add some basic exception reporting for emscripten (#71853)

---
 index.html                   |  5 ++++-
 src/emscripten_exception.cpp | 13 +++++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)
 create mode 100644 src/emscripten_exception.cpp

diff --git a/index.html b/index.html
index 78d5bd7422dd4..5292ea2e9e70f 100644
--- a/index.html
+++ b/index.html
@@ -287,7 +287,10 @@
         },
       };
       Module.setStatus("Downloading...");
-      window.onerror = function (event) {
+      window.onerror = function (event, source, lineno, colno, error) {
+        if (typeof error === 'number' && Module.getExceptionMessage) {
+          console.log(Module.getExceptionMessage(error));
+        }
         alert("Exception thrown, see JavaScript console.");
       };
       window.onbeforeunload = (e) => {
diff --git a/src/emscripten_exception.cpp b/src/emscripten_exception.cpp
new file mode 100644
index 0000000000000..573f18071205c
--- /dev/null
+++ b/src/emscripten_exception.cpp
@@ -0,0 +1,13 @@
+#if defined(EMSCRIPTEN)
+#include <emscripten/bind.h>
+
+std::string getExceptionMessage( intptr_t exceptionPtr )
+{
+    return std::string( reinterpret_cast<std::exception *>( exceptionPtr )->what() );
+}
+
+EMSCRIPTEN_BINDINGS( Bindings )
+{
+    emscripten::function( "getExceptionMessage", &getExceptionMessage );
+}
+#endif