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// Copyright 2016 Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package tracer
import (
"bufio"
"os"
"sort"
"strconv"
"strings"
"time"
)
type eventEntry struct {
Name string
Begin uint64
End uint64
}
func (t *tracerImpl) importEvents(entries []*eventEntry) {
sort.Slice(entries, func(i, j int) bool {
return entries[i].Begin < entries[j].Begin
})
cpus := []uint64{}
for _, entry := range entries {
tid := -1
for cpu, endTime := range cpus {
if endTime <= entry.Begin {
tid = cpu
cpus[cpu] = entry.End
break
}
}
if tid == -1 {
tid = len(cpus)
cpus = append(cpus, entry.End)
}
t.writeEvent(&viewerEvent{
Name: entry.Name,
Phase: "X",
Time: entry.Begin,
Dur: entry.End - entry.Begin,
Pid: 1,
Tid: uint64(tid),
})
}
}
// ImportNinjaLog reads a .ninja_log file from ninja and writes the events out
// to the trace.
//
// startOffset is when the ninja process started, and is used to position the
// relative times from the ninja log into the trace. It's also used to skip
// reading the ninja log if nothing was run.
func (t *tracerImpl) ImportNinjaLog(thread Thread, filename string, startOffset time.Time) {
t.Begin("ninja log import", thread)
defer t.End(thread)
if stat, err := os.Stat(filename); err != nil {
t.log.Println("Missing ninja log:", err)
return
} else if stat.ModTime().Before(startOffset) {
t.log.Verboseln("Ninja log not modified, not importing any entries.")
return
}
f, err := os.Open(filename)
if err != nil {
t.log.Println("Error opening ninja log:", err)
return
}
defer f.Close()
s := bufio.NewScanner(f)
header := true
entries := []*eventEntry{}
prevEnd := 0
offset := uint64(startOffset.UnixNano()) / 1000
for s.Scan() {
if header {
hdr := s.Text()
if hdr != "# ninja log v5" {
t.log.Printf("Unknown ninja log header: %q", hdr)
return
}
header = false
continue
}
fields := strings.Split(s.Text(), "\t")
begin, err := strconv.Atoi(fields[0])
if err != nil {
t.log.Printf("Unable to parse ninja entry %q: %v", s.Text(), err)
return
}
end, err := strconv.Atoi(fields[1])
if err != nil {
t.log.Printf("Unable to parse ninja entry %q: %v", s.Text(), err)
return
}
if end < prevEnd {
entries = nil
}
prevEnd = end
entries = append(entries, &eventEntry{
Name: fields[3],
Begin: offset + uint64(begin)*1000,
End: offset + uint64(end)*1000,
})
}
if err := s.Err(); err != nil {
t.log.Println("Unable to parse ninja log:", err)
return
}
t.importEvents(entries)
}
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