snapshot: sagernet/gvisor v0.0.0-20250811.0-sing-box-mod.1

Содержимое пина, зафиксированного в go.mod sing-box-lx, одним коммитом
без истории. Полная история SagerNet/gvisor — 1.45 ГБ и клонируется в
каждой CI-джобе; наша дельта — одна вставка в одну функцию, история для
неё не нужна.

Module path github.com/sagernet/gvisor сохранён намеренно: на него
опирается replace-директива суперпроекта.

Патч поверх — отдельным коммитом, чтобы дельта читалась одним git show
и переносилась на новый пин копированием.

SPECS/TASKS/048-GVISOR_HANDSHAKE_NIL_CRASH

pkg/bits/uint64_arch.go

@@ -0,0 +1,37 @@
+// Copyright 2018 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build amd64 || arm64
+// +build amd64 arm64
+
+package bits
+
+// TrailingZeros64 returns the number of bits before the least significant 1
+// bit in x; in other words, it returns the index of the least significant 1
+// bit in x. If x is 0, TrailingZeros64 returns 64.
+func TrailingZeros64(x uint64) int
+
+// MostSignificantOne64 returns the index of the most significant 1 bit in
+// x. If x is 0, MostSignificantOne64 returns 64.
+func MostSignificantOne64(x uint64) int
+
+// ForEachSetBit64 calls f once for each set bit in x, with argument i equal to
+// the set bit's index.
+func ForEachSetBit64(x uint64, f func(i int)) {
+	for x != 0 {
+		i := TrailingZeros64(x)
+		f(i)
+		x &^= MaskOf64(i)
+	}
+}