[gjs/mozjs78: 3/21] function: Only get function name if we actually warn

[Evan Welsh <ewlsh src gnome org>]

commit 9c70519719aac2822030703543ba2bc45c973ebf
Author: Jonas Dreßler <verdre v0yd nl>
Date:   Fri Jun 26 23:03:20 2020 +0200

    function: Only get function name if we actually warn
    
    Getting the function name for logging a warning/error message using
    format_function_name() is expensive and shows up with quite a few
    percent in the profiler.
    
    Luckily, we can completely get rid of that overhead by only getting the
    function name in case we actually have to warn. To do that, check the
    number of arguments ourselves instead of using args.requireAtLeast() and
    then move the call to format_function_name() into the if-conditions of
    those checks.

 gi/function.cpp | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)
---
diff --git a/gi/function.cpp b/gi/function.cpp
index 19594529..15f14caa 100644
--- a/gi/function.cpp
+++ b/gi/function.cpp
@@ -834,14 +834,18 @@ static bool gjs_invoke_c_function(JSContext* context, Function* function,
      *
      * @args.length() is the number of arguments that were actually passed.
      */
-    GjsAutoChar name = format_function_name(function);
     if (args.length() > function->expected_js_argc) {
+        GjsAutoChar name = format_function_name(function);
+
         if (!JS::WarnUTF8(
                 context, "Too many arguments to %s: expected %d, got %u",
                 name.get(), function->expected_js_argc, args.length()))
             return false;
-    } else if (!args.requireAtLeast(context, name,
-                                    function->expected_js_argc)) {
+    } else if (args.length() < function->expected_js_argc) {
+        GjsAutoChar name = format_function_name(function);
+
+        args.reportMoreArgsNeeded(context, name,
+                                  function->expected_js_argc, args.length());
         return false;
     }