// PProf acquires a profile, and symbolizes it using a profile
// manager. Then it generates a report formatted according to the
// options selected through the flags package.
func PProf(flagset plugin.FlagSet, fetch plugin.Fetcher, sym plugin.Symbolizer, obj plugin.ObjTool, ui plugin.UI, overrides commands.Commands) error {
// Remove any temporary files created during pprof processing.
defer tempfile.Cleanup()
f, err := getFlags(flagset, overrides, ui)
if err != nil {
return err
}
obj.SetConfig(*f.flagTools)
sources := f.profileSource
if len(sources) > 1 {
source := sources[0]
// If the first argument is a supported object file, treat as executable.
if file, err := obj.Open(source, 0); err == nil {
file.Close()
f.profileExecName = source
sources = sources[1:]
} else if *f.flagBuildID == "" && isBuildID(source) {
f.flagBuildID = &source
sources = sources[1:]
}
}
// errMu protects concurrent accesses to errset and err. errset is set if an
// error is encountered by one of the goroutines grabbing a profile.
errMu, errset := sync.Mutex{}, false
// Fetch profiles.
wg := sync.WaitGroup{}
profs := make([]*profile.Profile, len(sources))
for i, source := range sources {
wg.Add(1)
go func(i int, src string) {
defer wg.Done()
p, grabErr := grabProfile(src, f.profileExecName, *f.flagBuildID, fetch, sym, obj, ui, f)
if grabErr != nil {
errMu.Lock()
defer errMu.Unlock()
errset, err = true, grabErr
return
}
profs[i] = p
}(i, source)
}
wg.Wait()
if errset {
return err
}
// Merge profiles.
prof := profs[0]
for _, p := range profs[1:] {
if err = prof.Merge(p, 1); err != nil {
return err
}
}
if *f.flagBase != "" {
// Fetch base profile and subtract from current profile.
base, err := grabProfile(*f.flagBase, f.profileExecName, *f.flagBuildID, fetch, sym, obj, ui, f)
if err != nil {
return err
}
if err = prof.Merge(base, -1); err != nil {
return err
}
}
if err := processFlags(prof, ui, f); err != nil {
return err
}
if !*f.flagRuntime {
prof.RemoveUninteresting()
}
if *f.flagInteractive {
return interactive(prof, obj, ui, f)
}
return generate(false, prof, obj, ui, f)
}
