js: Replace error reporter callbacks

JS_SetErrorReporter() goes away in SpiderMonkey 52, and is replaced by
JS::SetWarningReporter(). Errors should now be reported manually after
each call into JS code. (We don't actually have to change much, since we
already used the DontReportUncaught option and reported uncaught
exceptions manually already. This is now the only choice.)

https://bugzilla.gnome.org/show_bug.cgi?id=784196

1 files changed, 29 insertions, 0 deletions

diff --git a/gjs/jsapi-util-error.cpp b/gjs/jsapi-util-error.cpp
index ce1bbd59..1196bd0e 100644
--- a/gjs/jsapi-util-error.cpp
+++ b/gjs/jsapi-util-error.cpp
@@ -202,3 +202,32 @@ gjs_throw_g_error (JSContext       *context,
 
     JS_EndRequest(context);
 }
+
+/**
+ * gjs_format_stack_trace:
+ * @cx: the #JSContext
+ * @saved_frame: a SavedFrame #JSObject
+ *
+ * Formats a stack trace as a string in filename encoding, suitable for
+ * printing to stderr. Ignores any errors.
+ *
+ * Returns: unique string in filename encoding, or nullptr if no stack trace
+ */
+GjsAutoChar
+gjs_format_stack_trace(JSContext       *cx,
+                       JS::HandleObject saved_frame)
+{
+    JS::AutoSaveExceptionState saved_exc(cx);
+
+    JS::RootedString stack_trace(cx);
+    GjsAutoJSChar stack_utf8(cx);
+    if (JS::BuildStackString(cx, saved_frame, &stack_trace, 2))
+        stack_utf8.reset(cx, JS_EncodeStringToUTF8(cx, stack_trace));
+
+    saved_exc.restore();
+
+    if (!stack_utf8)
+        return nullptr;
+
+    return g_filename_from_utf8(stack_utf8, -1, nullptr, nullptr, nullptr);
+}