stack

const (
	// AIX requires a larger stack for syscalls.
	// The race build also needs more stack. See issue 54291.
	//
	// This arithmetic must match that in
	// $GOROOT/cmd/internal/objabi/stack.go:stackGuardMultiplier.
	StackGuardMultiplier = 1 + os.IsAix + race.IsRace

	// StackSystem is a number of additional bytes to add
	// to each stack below the usual guard area for OS-specific
	// purposes like signal handling. Used on Windows, Plan 9,
	// and iOS because they do not use a separate stack.
	StackSystem = os.IsWindows*512*arch.PtrSize +
		os.IsPlan9*512 +
		os.IsIos*arch.IsArm64*1024

	// StackNosplit is the maximum number of bytes that a chain of NOSPLIT
	// functions can use.
	//
	// This arithmetic must match that in cmd/internal/objabi/stack.go:StackNosplit.
	StackNosplit = abi.StackNosplitBase * StackGuardMultiplier

	// The stack guard is a pointer this many bytes above the
	// bottom of the stack.
	//
	// The guard leaves enough room for a stackNosplit chain of NOSPLIT calls
	// plus one stackSmall frame plus stackSystem bytes for the OS.
	//
	// This arithmetic must match that in cmd/internal/objabi/stack.go:StackLimit.
	StackGuard = StackNosplit + StackSystem + abi.StackSmall
)