}
	if !isShrinkStackSafe(gp) {
		throw("shrinkstack at bad time")
	}
	// Check for self-shrinks while in a libcall. These may have
	// pointers into the stack disguised as uintptrs, but these
	// code paths should all be nosplit.
	if gp == getg().m.curg && gp.m.libcallsp != 0 {
		throw("shrinking stack in libcall")
	}

	if debug.gcshrinkstackoff > 0 {
		return
	}
	f := findfunc(gp.startpc)

// particular, call Values can have a stack map in case the callee
// grows the stack, but not themselves be a safe-point.
func (lv *liveness) hasStackMap(v *ssa.Value) bool {
	if !v.Op.IsCall() {
		return false
	}
	// wbZero and wbCopy are write barriers and
	// deeply non-preemptible. They are unsafe points and
	// hence should not have liveness maps.