mirror of git://gcc.gnu.org/git/gcc.git
351 lines
12 KiB
Go
351 lines
12 KiB
Go
// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package pprof
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"internal/testenv"
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"io/ioutil"
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"os"
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"os/exec"
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"reflect"
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"runtime"
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"runtime/pprof/internal/profile"
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"strings"
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"testing"
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)
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// translateCPUProfile parses binary CPU profiling stack trace data
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// generated by runtime.CPUProfile() into a profile struct.
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// This is only used for testing. Real conversions stream the
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// data into the profileBuilder as it becomes available.
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func translateCPUProfile(data []uint64) (*profile.Profile, error) {
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var buf bytes.Buffer
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b := newProfileBuilder(&buf)
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if err := b.addCPUData(data, nil); err != nil {
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return nil, err
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}
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b.build()
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return profile.Parse(&buf)
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}
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// fmtJSON returns a pretty-printed JSON form for x.
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// It works reasonbly well for printing protocol-buffer
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// data structures like profile.Profile.
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func fmtJSON(x interface{}) string {
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js, _ := json.MarshalIndent(x, "", "\t")
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return string(js)
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}
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func TestConvertCPUProfileEmpty(t *testing.T) {
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// A test server with mock cpu profile data.
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var buf bytes.Buffer
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b := []uint64{3, 0, 500} // empty profile at 500 Hz (2ms sample period)
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p, err := translateCPUProfile(b)
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if err != nil {
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t.Fatalf("translateCPUProfile: %v", err)
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}
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if err := p.Write(&buf); err != nil {
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t.Fatalf("writing profile: %v", err)
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}
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p, err = profile.Parse(&buf)
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if err != nil {
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t.Fatalf("profile.Parse: %v", err)
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}
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// Expected PeriodType and SampleType.
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periodType := &profile.ValueType{Type: "cpu", Unit: "nanoseconds"}
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sampleType := []*profile.ValueType{
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{Type: "samples", Unit: "count"},
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{Type: "cpu", Unit: "nanoseconds"},
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}
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checkProfile(t, p, 2000*1000, periodType, sampleType, nil, "")
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}
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// For gccgo make these functions different so that gccgo doesn't
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// merge them with each other and with lostProfileEvent.
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func f1(i int) { f1(i + 1) }
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func f2(i int) { f2(i + 2) }
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// testPCs returns two PCs and two corresponding memory mappings
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// to use in test profiles.
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func testPCs(t *testing.T) (addr1, addr2 uint64, map1, map2 *profile.Mapping) {
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switch runtime.GOOS {
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case "linux", "android", "netbsd":
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// Figure out two addresses from /proc/self/maps.
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mmap, err := ioutil.ReadFile("/proc/self/maps")
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if err != nil {
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t.Fatal(err)
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}
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mprof := &profile.Profile{}
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if err = mprof.ParseMemoryMap(bytes.NewReader(mmap)); err != nil {
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t.Fatalf("parsing /proc/self/maps: %v", err)
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}
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if len(mprof.Mapping) < 2 {
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// It is possible for a binary to only have 1 executable
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// region of memory.
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t.Skipf("need 2 or more mappings, got %v", len(mprof.Mapping))
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}
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addr1 = mprof.Mapping[0].Start
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map1 = mprof.Mapping[0]
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map1.BuildID, _ = elfBuildID(map1.File)
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addr2 = mprof.Mapping[1].Start
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map2 = mprof.Mapping[1]
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map2.BuildID, _ = elfBuildID(map2.File)
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case "js":
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addr1 = uint64(funcPC(f1))
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addr2 = uint64(funcPC(f2))
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default:
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addr1 = uint64(funcPC(f1))
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addr2 = uint64(funcPC(f2))
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// Fake mapping - HasFunctions will be true because two PCs from Go
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// will be fully symbolized.
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fake := &profile.Mapping{ID: 1, HasFunctions: true}
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map1, map2 = fake, fake
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}
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return
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}
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func TestConvertCPUProfile(t *testing.T) {
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addr1, addr2, map1, map2 := testPCs(t)
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b := []uint64{
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3, 0, 500, // hz = 500
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5, 0, 10, uint64(addr1), uint64(addr1 + 2), // 10 samples in addr1
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5, 0, 40, uint64(addr2), uint64(addr2 + 2), // 40 samples in addr2
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5, 0, 10, uint64(addr1), uint64(addr1 + 2), // 10 samples in addr1
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}
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p, err := translateCPUProfile(b)
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if err != nil {
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t.Fatalf("translating profile: %v", err)
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}
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period := int64(2000 * 1000)
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periodType := &profile.ValueType{Type: "cpu", Unit: "nanoseconds"}
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sampleType := []*profile.ValueType{
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{Type: "samples", Unit: "count"},
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{Type: "cpu", Unit: "nanoseconds"},
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}
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samples := []*profile.Sample{
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{Value: []int64{20, 20 * 2000 * 1000}, Location: []*profile.Location{
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{ID: 1, Mapping: map1, Address: addr1},
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{ID: 2, Mapping: map1, Address: addr1 + 1},
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}},
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{Value: []int64{40, 40 * 2000 * 1000}, Location: []*profile.Location{
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{ID: 3, Mapping: map2, Address: addr2},
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{ID: 4, Mapping: map2, Address: addr2 + 1},
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}},
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}
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checkProfile(t, p, period, periodType, sampleType, samples, "")
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}
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func checkProfile(t *testing.T, p *profile.Profile, period int64, periodType *profile.ValueType, sampleType []*profile.ValueType, samples []*profile.Sample, defaultSampleType string) {
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t.Helper()
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if p.Period != period {
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t.Errorf("p.Period = %d, want %d", p.Period, period)
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}
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if !reflect.DeepEqual(p.PeriodType, periodType) {
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t.Errorf("p.PeriodType = %v\nwant = %v", fmtJSON(p.PeriodType), fmtJSON(periodType))
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}
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if !reflect.DeepEqual(p.SampleType, sampleType) {
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t.Errorf("p.SampleType = %v\nwant = %v", fmtJSON(p.SampleType), fmtJSON(sampleType))
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}
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if defaultSampleType != p.DefaultSampleType {
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t.Errorf("p.DefaultSampleType = %v\nwant = %v", p.DefaultSampleType, defaultSampleType)
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}
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// Clear line info since it is not in the expected samples.
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// If we used f1 and f2 above, then the samples will have line info.
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for _, s := range p.Sample {
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for _, l := range s.Location {
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l.Line = nil
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}
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}
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if fmtJSON(p.Sample) != fmtJSON(samples) { // ignore unexported fields
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if len(p.Sample) == len(samples) {
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for i := range p.Sample {
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if !reflect.DeepEqual(p.Sample[i], samples[i]) {
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t.Errorf("sample %d = %v\nwant = %v\n", i, fmtJSON(p.Sample[i]), fmtJSON(samples[i]))
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}
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}
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if t.Failed() {
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t.FailNow()
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}
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}
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t.Fatalf("p.Sample = %v\nwant = %v", fmtJSON(p.Sample), fmtJSON(samples))
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}
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}
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var profSelfMapsTests = `
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00400000-0040b000 r-xp 00000000 fc:01 787766 /bin/cat
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0060a000-0060b000 r--p 0000a000 fc:01 787766 /bin/cat
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0060b000-0060c000 rw-p 0000b000 fc:01 787766 /bin/cat
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014ab000-014cc000 rw-p 00000000 00:00 0 [heap]
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7f7d76af8000-7f7d7797c000 r--p 00000000 fc:01 1318064 /usr/lib/locale/locale-archive
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7f7d7797c000-7f7d77b36000 r-xp 00000000 fc:01 1180226 /lib/x86_64-linux-gnu/libc-2.19.so
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7f7d77b36000-7f7d77d36000 ---p 001ba000 fc:01 1180226 /lib/x86_64-linux-gnu/libc-2.19.so
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7f7d77d36000-7f7d77d3a000 r--p 001ba000 fc:01 1180226 /lib/x86_64-linux-gnu/libc-2.19.so
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7f7d77d3a000-7f7d77d3c000 rw-p 001be000 fc:01 1180226 /lib/x86_64-linux-gnu/libc-2.19.so
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7f7d77d3c000-7f7d77d41000 rw-p 00000000 00:00 0
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7f7d77d41000-7f7d77d64000 r-xp 00000000 fc:01 1180217 /lib/x86_64-linux-gnu/ld-2.19.so
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7f7d77f3f000-7f7d77f42000 rw-p 00000000 00:00 0
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7f7d77f61000-7f7d77f63000 rw-p 00000000 00:00 0
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7f7d77f63000-7f7d77f64000 r--p 00022000 fc:01 1180217 /lib/x86_64-linux-gnu/ld-2.19.so
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7f7d77f64000-7f7d77f65000 rw-p 00023000 fc:01 1180217 /lib/x86_64-linux-gnu/ld-2.19.so
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7f7d77f65000-7f7d77f66000 rw-p 00000000 00:00 0
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7ffc342a2000-7ffc342c3000 rw-p 00000000 00:00 0 [stack]
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7ffc34343000-7ffc34345000 r-xp 00000000 00:00 0 [vdso]
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ffffffffff600000-ffffffffff601000 r-xp 00000090 00:00 0 [vsyscall]
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->
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00400000 0040b000 00000000 /bin/cat
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7f7d7797c000 7f7d77b36000 00000000 /lib/x86_64-linux-gnu/libc-2.19.so
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7f7d77d41000 7f7d77d64000 00000000 /lib/x86_64-linux-gnu/ld-2.19.so
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7ffc34343000 7ffc34345000 00000000 [vdso]
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ffffffffff600000 ffffffffff601000 00000090 [vsyscall]
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00400000-07000000 r-xp 00000000 00:00 0
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07000000-07093000 r-xp 06c00000 00:2e 536754 /path/to/gobench_server_main
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07093000-0722d000 rw-p 06c92000 00:2e 536754 /path/to/gobench_server_main
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0722d000-07b21000 rw-p 00000000 00:00 0
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c000000000-c000036000 rw-p 00000000 00:00 0
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->
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07000000 07093000 06c00000 /path/to/gobench_server_main
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`
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func TestProcSelfMaps(t *testing.T) {
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for tx, tt := range strings.Split(profSelfMapsTests, "\n\n") {
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i := strings.Index(tt, "->\n")
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if i < 0 {
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t.Fatal("malformed test case")
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}
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in, out := tt[:i], tt[i+len("->\n"):]
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if len(out) > 0 && out[len(out)-1] != '\n' {
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out += "\n"
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}
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var buf bytes.Buffer
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parseProcSelfMaps([]byte(in), func(lo, hi, offset uint64, file, buildID string) {
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fmt.Fprintf(&buf, "%08x %08x %08x %s\n", lo, hi, offset, file)
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})
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if buf.String() != out {
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t.Errorf("#%d: have:\n%s\nwant:\n%s\n%q\n%q", tx, buf.String(), out, buf.String(), out)
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}
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}
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}
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// TestMapping checkes the mapping section of CPU profiles
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// has the HasFunctions field set correctly. If all PCs included
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// in the samples are successfully symbolized, the corresponding
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// mapping entry (in this test case, only one entry) should have
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// its HasFunctions field set true.
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// The test generates a CPU profile that includes PCs from C side
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// that the runtime can't symbolize. See ./testdata/mappingtest.
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func TestMapping(t *testing.T) {
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testenv.MustHaveGoRun(t)
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testenv.MustHaveCGO(t)
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prog := "./testdata/mappingtest/main.go"
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// GoOnly includes only Go symbols that runtime will symbolize.
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// Go+C includes C symbols that runtime will not symbolize.
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for _, traceback := range []string{"GoOnly", "Go+C"} {
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t.Run("traceback"+traceback, func(t *testing.T) {
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cmd := exec.Command(testenv.GoToolPath(t), "run", prog)
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if traceback != "GoOnly" {
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cmd.Env = append(os.Environ(), "SETCGOTRACEBACK=1")
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}
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cmd.Stderr = new(bytes.Buffer)
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out, err := cmd.Output()
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if err != nil {
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t.Fatalf("failed to run the test program %q: %v\n%v", prog, err, cmd.Stderr)
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}
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prof, err := profile.Parse(bytes.NewReader(out))
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if err != nil {
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t.Fatalf("failed to parse the generated profile data: %v", err)
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}
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t.Logf("Profile: %s", prof)
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hit := make(map[*profile.Mapping]bool)
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miss := make(map[*profile.Mapping]bool)
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for _, loc := range prof.Location {
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if symbolized(loc) {
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hit[loc.Mapping] = true
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} else {
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miss[loc.Mapping] = true
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}
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}
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if len(miss) == 0 {
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t.Log("no location with missing symbol info was sampled")
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}
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for _, m := range prof.Mapping {
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if miss[m] && m.HasFunctions {
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t.Errorf("mapping %+v has HasFunctions=true, but contains locations with failed symbolization", m)
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continue
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}
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if !miss[m] && hit[m] && !m.HasFunctions {
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t.Errorf("mapping %+v has HasFunctions=false, but all referenced locations from this lapping were symbolized successfully", m)
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continue
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}
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}
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})
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}
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}
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func symbolized(loc *profile.Location) bool {
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if len(loc.Line) == 0 {
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return false
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}
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l := loc.Line[0]
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f := l.Function
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if l.Line == 0 || f == nil || f.Name == "" || f.Filename == "" {
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return false
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}
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return true
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}
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// TestFakeMapping tests if at least one mapping exists
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// (including a fake mapping), and their HasFunctions bits
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// are set correctly.
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func TestFakeMapping(t *testing.T) {
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var buf bytes.Buffer
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if err := Lookup("heap").WriteTo(&buf, 0); err != nil {
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t.Fatalf("failed to write heap profile: %v", err)
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}
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prof, err := profile.Parse(&buf)
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if err != nil {
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t.Fatalf("failed to parse the generated profile data: %v", err)
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}
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t.Logf("Profile: %s", prof)
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if len(prof.Mapping) == 0 {
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t.Fatal("want profile with at least one mapping entry, got 0 mapping")
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}
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hit := make(map[*profile.Mapping]bool)
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miss := make(map[*profile.Mapping]bool)
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for _, loc := range prof.Location {
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if symbolized(loc) {
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hit[loc.Mapping] = true
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} else {
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miss[loc.Mapping] = true
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}
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}
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for _, m := range prof.Mapping {
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if miss[m] && m.HasFunctions {
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t.Errorf("mapping %+v has HasFunctions=true, but contains locations with failed symbolization", m)
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continue
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}
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if !miss[m] && hit[m] && !m.HasFunctions {
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t.Errorf("mapping %+v has HasFunctions=false, but all referenced locations from this lapping were symbolized successfully", m)
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continue
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}
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}
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}
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