Adding upstream version 1.21.8.upstream/1.21.8

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 32 insertions, 0 deletions

diff --git a/src/cmd/internal/objabi/stack.go b/src/cmd/internal/objabi/stack.go
new file mode 100644
index 0000000..7c7ff4e
--- /dev/null
+++ b/src/cmd/internal/objabi/stack.go
@@ -0,0 +1,32 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package objabi
+
+import (
+	"internal/abi"
+	"internal/buildcfg"
+)
+
+func StackNosplit(race bool) int {
+	// This arithmetic must match that in runtime/stack.go:stackNosplit.
+	return abi.StackNosplitBase * stackGuardMultiplier(race)
+}
+
+// stackGuardMultiplier returns a multiplier to apply to the default
+// stack guard size. Larger multipliers are used for non-optimized
+// builds that have larger stack frames or for specific targets.
+func stackGuardMultiplier(race bool) int {
+	// This arithmetic must match that in runtime/internal/sys/consts.go:StackGuardMultiplier.
+	n := 1
+	// On AIX, a larger stack is needed for syscalls.
+	if buildcfg.GOOS == "aix" {
+		n += 1
+	}
+	// The race build also needs more stack.
+	if race {
+		n += 1
+	}
+	return n
+}