1package report
2
3import (
4	"github.com/google/pprof/profile"
5)
6
7// synthCode assigns addresses to locations without an address.
8type synthCode struct {
9	next uint64
10	addr map[*profile.Location]uint64 // Synthesized address assigned to a location
11}
12
13func newSynthCode(mappings []*profile.Mapping) *synthCode {
14	// Find a larger address than any mapping.
15	s := &synthCode{next: 1}
16	for _, m := range mappings {
17		if s.next < m.Limit {
18			s.next = m.Limit
19		}
20	}
21	return s
22}
23
24// address returns the synthetic address for loc, creating one if needed.
25func (s *synthCode) address(loc *profile.Location) uint64 {
26	if loc.Address != 0 {
27		panic("can only synthesize addresses for locations without an address")
28	}
29	if addr, ok := s.addr[loc]; ok {
30		return addr
31	}
32	if s.addr == nil {
33		s.addr = map[*profile.Location]uint64{}
34	}
35	addr := s.next
36	s.next++
37	s.addr[loc] = addr
38	return addr
39}
40