1 files changed, 34 insertions, 0 deletions
diff --git a/third_party/rust/uniffi/src/panichook.rs b/third_party/rust/uniffi/src/panichook.rs
new file mode 100644
index 0000000000..ef0ab86f1f
--- /dev/null
+++ b/third_party/rust/uniffi/src/panichook.rs
@@ -0,0 +1,34 @@
+/// Initialize our panic handling hook to optionally log panics
+#[cfg(feature = "log_panics")]
+pub fn ensure_setup() {
+    use std::sync::Once;
+    static INIT_BACKTRACES: Once = Once::new();
+    INIT_BACKTRACES.call_once(move || {
+        #[cfg(all(feature = "log_backtraces", not(target_os = "android")))]
+        {
+            std::env::set_var("RUST_BACKTRACE", "1");
+        }
+        // Turn on a panic hook which logs both backtraces and the panic
+        // "Location" (file/line). We do both in case we've been stripped,
+        // ).
+        std::panic::set_hook(Box::new(move |panic_info| {
+            let (file, line) = if let Some(loc) = panic_info.location() {
+                (loc.file(), loc.line())
+            } else {
+                // Apparently this won't happen but rust has reserved the
+                // ability to start returning None from location in some cases
+                // in the future.
+                ("<unknown>", 0)
+            };
+            log::error!("### Rust `panic!` hit at file '{file}', line {line}");
+            #[cfg(all(feature = "log_backtraces", not(target_os = "android")))]
+            {
+                log::error!("  Complete stack trace:\n{:?}", backtrace::Backtrace::new());
+            }
+        }));
+    });
+}
+
+/// Initialize our panic handling hook to optionally log panics
+#[cfg(not(feature = "log_panics"))]
+pub fn ensure_setup() {}