locations string
	labels    string
	numlabels string
}

func (pm *profileMerger) mapLocation(src *Location) *Location {
	if src == nil {
		return nil
	}

	if l, ok := pm.locationsByID[src.ID]; ok {
		pm.locationsByID[src.ID] = l
		return l
	}

	mi := pm.mapMapping(src.Mapping)
	l := &Location{
		ID:       uint64(len(pm.p.Location) + 1),
		Mapping:  mi.m,

	}
	// Check memoization table. Must be done on the remapped location to
	// account for the remapped mapping ID.
	k := l.key()
	if ll, ok := pm.locations[k]; ok {
		pm.locationsByID.set(src.ID, ll)
		return ll
	}
	pm.locationsByID.set(src.ID, l)
	pm.locations[k] = l
	pm.p.Location = append(pm.p.Location, l)
	return l
}

// key generates locationKey to be used as a key for maps.