[njs] Added njs_is_memory_error() function.

[Alexander Borisov]

details:   https://hg.nginx.org/njs/rev/ef64784b77f6
branches:  
changeset: 1277:ef64784b77f6
user:      Alexander Borisov <alexander.borisov at nginx.com>
date:      Tue Dec 03 18:02:40 2019 +0300
description:
Added njs_is_memory_error() function.

diffstat:

 src/njs_error.h |  14 ++++++++++++++
 src/njs_vm.c    |   7 +------
 2 files changed, 15 insertions(+), 6 deletions(-)

diffs (39 lines):

diff -r 6e84ff419b88 -r ef64784b77f6 src/njs_error.h
--- a/src/njs_error.h	Tue Dec 03 17:58:30 2019 +0300
+++ b/src/njs_error.h	Tue Dec 03 18:02:40 2019 +0300
@@ -59,4 +59,18 @@ extern const njs_object_type_init_t  njs
 extern const njs_object_type_init_t  njs_memory_error_type_init;
 
 
+njs_inline njs_int_t
+njs_is_memory_error(njs_vm_t *vm, njs_value_t *value)
+{
+    if (njs_is_error(value)
+        && njs_has_prototype(vm, value, NJS_OBJ_TYPE_INTERNAL_ERROR)
+        && !njs_object(value)->extensible)
+    {
+        return 1;
+    }
+
+    return 0;
+}
+
+
 #endif /* _NJS_BOOLEAN_H_INCLUDED_ */
diff -r 6e84ff419b88 -r ef64784b77f6 src/njs_vm.c
--- a/src/njs_vm.c	Tue Dec 03 17:58:30 2019 +0300
+++ b/src/njs_vm.c	Tue Dec 03 18:02:40 2019 +0300
@@ -852,12 +852,7 @@ njs_vm_value_to_string(njs_vm_t *vm, njs
     }
 
     if (njs_is_error(src)) {
-
-        /* MemoryError is a nonextensible internal error. */
-
-        if (njs_has_prototype(vm, src, NJS_OBJ_TYPE_INTERNAL_ERROR)
-            && !njs_object(src)->extensible)
-        {
+        if (njs_is_memory_error(vm, src)) {
             njs_string_get(&njs_string_memory_error, dst);
             return NJS_OK;
         }