[gjs: 2/11] jsapi-util: Debug values without a toString()

[Cosimo Cecchi <cosimoc src gnome org>]

commit 158ba9af66a734ad435e6df3f3f09df51ca296b9
Author: Philip Chimento <philip chimento gmail com>
Date:   Wed Oct 10 22:37:39 2018 -0700

    jsapi-util: Debug values without a toString()
    
    When using gjs_value_debug_string() (which is what is used in the console
    interpreter to print the result of an expression) we try to be a bit more
    intelligent when a value doesn't have a toString(), and use
    JS_ValueToSource() instead.
    
    This was the case for Symbols; previously the output for `Symbol('foo')`
    in the console interpreter was "[unknown non-object]" plus an exception
    stack trace.

 gjs/jsapi-util.cpp | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/gjs/jsapi-util.cpp b/gjs/jsapi-util.cpp
index 31a11841..59ab67f4 100644
--- a/gjs/jsapi-util.cpp
+++ b/gjs/jsapi-util.cpp
@@ -449,6 +449,11 @@ gjs_value_debug_string(JSContext      *context,
 
     JS::RootedString str(context, JS::ToString(context, value));
 
+    if (!str) {
+        JS_ClearPendingException(context);
+        str = JS_ValueToSource(context, value);
+    }
+
     if (!str) {
         if (value.isObject()) {
             /* Specifically the Call object (see jsfun.c in spidermonkey)