[njs] Fixed Array.prototype.sort() when arr size is changed in a comparator.

[Dmitry Volyntsev]

details:   https://hg.nginx.org/njs/rev/9424f42b7266
branches:  
changeset: 1839:9424f42b7266
user:      Dmitry Volyntsev <xeioex at nginx.com>
date:      Fri Apr 22 17:02:28 2022 -0700
description:
Fixed Array.prototype.sort() when arr size is changed in a comparator.

This fixed #468 issue on Github.

diffstat:

 src/njs_array.c          |  2 +-
 src/test/njs_unit_test.c |  3 +++
 2 files changed, 4 insertions(+), 1 deletions(-)

diffs (25 lines):

diff -r 6b226ed1b25d -r 9424f42b7266 src/njs_array.c
--- a/src/njs_array.c	Thu Apr 14 16:07:34 2022 -0700
+++ b/src/njs_array.c	Fri Apr 22 17:02:28 2022 -0700
@@ -2696,7 +2696,7 @@ slow_path:
         goto exception;
     }
 
-    if (njs_fast_path(fast_path)) {
+    if (njs_fast_path(fast_path && njs_is_fast_array(this))) {
         array = njs_array(this);
         start = array->start;
 
diff -r 6b226ed1b25d -r 9424f42b7266 src/test/njs_unit_test.c
--- a/src/test/njs_unit_test.c	Thu Apr 14 16:07:34 2022 -0700
+++ b/src/test/njs_unit_test.c	Fri Apr 22 17:02:28 2022 -0700
@@ -6989,6 +6989,9 @@ static njs_unit_test_t  njs_test[] =
     { njs_str("[1,2].sort(1)"),
       njs_str("TypeError: comparefn must be callable or undefined") },
 
+    { njs_str("var a = [1,2]; a.sort(() => {a.length = 65535}); a.length"),
+      njs_str("65535") },
+
     /*
       Array.prototype.keys()
       Array.prototype.values()