Make js_DumpValue more useful with function jsvals. r=mrbkap

js/src/jsobj.cpp

@@ -5925,6 +5925,15 @@ dumpValue(jsval val)
         fprintf(stderr, "null");
     } else if (JSVAL_IS_VOID(val)) {
         fprintf(stderr, "undefined");
+    } else if (JSVAL_IS_OBJECT(val) &&
+               HAS_FUNCTION_CLASS(JSVAL_TO_OBJECT(val))) {
+        JSObject *funobj = JSVAL_TO_OBJECT(val);
+        JSFunction *fun = (JSFunction *) STOBJ_GET_PRIVATE(funobj);
+        fprintf(stderr, "<%s %s at %p (JSFunction at %p)>",
+                fun->atom ? "function" : "unnamed",
+                fun->atom ? JS_GetStringBytes(ATOM_TO_STRING(fun->atom)) : "function",
+                (void *) funobj,
+                (void *) fun);
     } else if (JSVAL_IS_OBJECT(val)) {
         JSObject *obj = JSVAL_TO_OBJECT(val);
         JSClass *cls = STOBJ_GET_CLASS(obj);