go synth 源码
golang synth 代码
文件路径：/src/cmd/vendor/github.com/google/pprof/internal/report/synth.go
package report
import (
"github.com/google/pprof/profile"
)
// synthCode assigns addresses to locations without an address.
type synthCode struct {
next uint64
addr map[*profile.Location]uint64 // Synthesized address assigned to a location
}
func newSynthCode(mappings []*profile.Mapping) *synthCode {
// Find a larger address than any mapping.
s := &synthCode{next: 1}
for _, m := range mappings {
if s.next < m.Limit {
s.next = m.Limit
}
}
return s
}
// address returns the synthetic address for loc, creating one if needed.
func (s *synthCode) address(loc *profile.Location) uint64 {
if loc.Address != 0 {
panic("can only synthesize addresses for locations without an address")
}
if addr, ok := s.addr[loc]; ok {
return addr
}
if s.addr == nil {
s.addr = map[*profile.Location]uint64{}
}
addr := s.next
s.next++
s.addr[loc] = addr
return addr
}
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