runtime/trace: add new package

Move tracing functions from runtime/pprof to the new runtime/trace package.

Fixes #9710

Change-Id: I718bcb2ae3e5959d9f72cab5e6708289e5c8ebd5
Reviewed-on: https://go-review.googlesource.com/12511
Reviewed-by: Russ Cox <rsc@golang.org>

1 files changed, 0 insertions, 285 deletions

diff --git a/src/runtime/pprof/trace_stack_test.go b/src/runtime/pprof/trace_stack_test.go
deleted file mode 100644
index 984879dc92..0000000000
--- a/src/runtime/pprof/trace_stack_test.go
+++ /dev/null
@@ -1,285 +0,0 @@
-// Copyright 2014 The Go Authors.  All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package pprof_test
-
-import (
-	"bytes"
-	"internal/trace"
-	"net"
-	"os"
-	"runtime"
-	. "runtime/pprof"
-	"sync"
-	"testing"
-	"time"
-)
-
-// TestTraceSymbolize tests symbolization and that events has proper stacks.
-// In particular that we strip bottom uninteresting frames like goexit,
-// top uninteresting frames (runtime guts).
-func TestTraceSymbolize(t *testing.T) {
-	skipTraceTestsIfNeeded(t)
-	if runtime.GOOS == "nacl" {
-		t.Skip("skipping: nacl tests fail with 'failed to symbolize trace: failed to start addr2line'")
-	}
-	buf := new(bytes.Buffer)
-	if err := StartTrace(buf); err != nil {
-		t.Fatalf("failed to start tracing: %v", err)
-	}
-
-	// Now we will do a bunch of things for which we verify stacks later.
-	// It is impossible to ensure that a goroutine has actually blocked
-	// on a channel, in a select or otherwise. So we kick off goroutines
-	// that need to block first in the hope that while we are executing
-	// the rest of the test, they will block.
-	go func() {
-		select {}
-	}()
-	go func() {
-		var c chan int
-		c <- 0
-	}()
-	go func() {
-		var c chan int
-		<-c
-	}()
-	done1 := make(chan bool)
-	go func() {
-		<-done1
-	}()
-	done2 := make(chan bool)
-	go func() {
-		done2 <- true
-	}()
-	c1 := make(chan int)
-	c2 := make(chan int)
-	go func() {
-		select {
-		case <-c1:
-		case <-c2:
-		}
-	}()
-	var mu sync.Mutex
-	mu.Lock()
-	go func() {
-		mu.Lock()
-		mu.Unlock()
-	}()
-	var wg sync.WaitGroup
-	wg.Add(1)
-	go func() {
-		wg.Wait()
-	}()
-	cv := sync.NewCond(&sync.Mutex{})
-	go func() {
-		cv.L.Lock()
-		cv.Wait()
-		cv.L.Unlock()
-	}()
-	ln, err := net.Listen("tcp", "localhost:0")
-	if err != nil {
-		t.Fatalf("failed to listen: %v", err)
-	}
-	go func() {
-		c, err := ln.Accept()
-		if err != nil {
-			t.Fatalf("failed to accept: %v", err)
-		}
-		c.Close()
-	}()
-	rp, wp, err := os.Pipe()
-	if err != nil {
-		t.Fatalf("failed to create a pipe: %v", err)
-	}
-	defer rp.Close()
-	defer wp.Close()
-	pipeReadDone := make(chan bool)
-	go func() {
-		var data [1]byte
-		rp.Read(data[:])
-		pipeReadDone <- true
-	}()
-
-	time.Sleep(time.Millisecond)
-	runtime.GC()
-	runtime.Gosched()
-	time.Sleep(time.Millisecond) // the last chance for the goroutines above to block
-	done1 <- true
-	<-done2
-	select {
-	case c1 <- 0:
-	case c2 <- 0:
-	}
-	mu.Unlock()
-	wg.Done()
-	cv.Signal()
-	c, err := net.Dial("tcp", ln.Addr().String())
-	if err != nil {
-		t.Fatalf("failed to dial: %v", err)
-	}
-	c.Close()
-	var data [1]byte
-	wp.Write(data[:])
-	<-pipeReadDone
-
-	StopTrace()
-	events, _, err := parseTrace(buf)
-	if err != nil {
-		t.Fatalf("failed to parse trace: %v", err)
-	}
-	err = trace.Symbolize(events, os.Args[0])
-	if err != nil {
-		t.Fatalf("failed to symbolize trace: %v", err)
-	}
-
-	// Now check that the stacks are correct.
-	type frame struct {
-		Fn   string
-		Line int
-	}
-	type eventDesc struct {
-		Type byte
-		Stk  []frame
-	}
-	want := []eventDesc{
-		eventDesc{trace.EvGCStart, []frame{
-			frame{"runtime.GC", 0},
-			frame{"runtime/pprof_test.TestTraceSymbolize", 106},
-			frame{"testing.tRunner", 0},
-		}},
-		eventDesc{trace.EvGoSched, []frame{
-			frame{"runtime/pprof_test.TestTraceSymbolize", 107},
-			frame{"testing.tRunner", 0},
-		}},
-		eventDesc{trace.EvGoCreate, []frame{
-			frame{"runtime/pprof_test.TestTraceSymbolize", 39},
-			frame{"testing.tRunner", 0},
-		}},
-		eventDesc{trace.EvGoStop, []frame{
-			frame{"runtime.block", 0},
-			frame{"runtime/pprof_test.TestTraceSymbolize.func1", 38},
-		}},
-		eventDesc{trace.EvGoStop, []frame{
-			frame{"runtime.chansend1", 0},
-			frame{"runtime/pprof_test.TestTraceSymbolize.func2", 42},
-		}},
-		eventDesc{trace.EvGoStop, []frame{
-			frame{"runtime.chanrecv1", 0},
-			frame{"runtime/pprof_test.TestTraceSymbolize.func3", 46},
-		}},
-		eventDesc{trace.EvGoBlockRecv, []frame{
-			frame{"runtime.chanrecv1", 0},
-			frame{"runtime/pprof_test.TestTraceSymbolize.func4", 50},
-		}},
-		eventDesc{trace.EvGoUnblock, []frame{
-			frame{"runtime.chansend1", 0},
-			frame{"runtime/pprof_test.TestTraceSymbolize", 109},
-			frame{"testing.tRunner", 0},
-		}},
-		eventDesc{trace.EvGoBlockSend, []frame{
-			frame{"runtime.chansend1", 0},
-			frame{"runtime/pprof_test.TestTraceSymbolize.func5", 54},
-		}},
-		eventDesc{trace.EvGoUnblock, []frame{
-			frame{"runtime.chanrecv1", 0},
-			frame{"runtime/pprof_test.TestTraceSymbolize", 110},
-			frame{"testing.tRunner", 0},
-		}},
-		eventDesc{trace.EvGoBlockSelect, []frame{
-			frame{"runtime.selectgo", 0},
-			frame{"runtime/pprof_test.TestTraceSymbolize.func6", 59},
-		}},
-		eventDesc{trace.EvGoUnblock, []frame{
-			frame{"runtime.selectgo", 0},
-			frame{"runtime/pprof_test.TestTraceSymbolize", 111},
-			frame{"testing.tRunner", 0},
-		}},
-		eventDesc{trace.EvGoBlockSync, []frame{
-			frame{"sync.(*Mutex).Lock", 0},
-			frame{"runtime/pprof_test.TestTraceSymbolize.func7", 67},
-		}},
-		eventDesc{trace.EvGoUnblock, []frame{
-			frame{"sync.(*Mutex).Unlock", 0},
-			frame{"runtime/pprof_test.TestTraceSymbolize", 115},
-			frame{"testing.tRunner", 0},
-		}},
-		eventDesc{trace.EvGoBlockSync, []frame{
-			frame{"sync.(*WaitGroup).Wait", 0},
-			frame{"runtime/pprof_test.TestTraceSymbolize.func8", 73},
-		}},
-		eventDesc{trace.EvGoUnblock, []frame{
-			frame{"sync.(*WaitGroup).Add", 0},
-			frame{"sync.(*WaitGroup).Done", 0},
-			frame{"runtime/pprof_test.TestTraceSymbolize", 116},
-			frame{"testing.tRunner", 0},
-		}},
-		eventDesc{trace.EvGoBlockCond, []frame{
-			frame{"sync.(*Cond).Wait", 0},
-			frame{"runtime/pprof_test.TestTraceSymbolize.func9", 78},
-		}},
-		eventDesc{trace.EvGoUnblock, []frame{
-			frame{"sync.(*Cond).Signal", 0},
-			frame{"runtime/pprof_test.TestTraceSymbolize", 117},
-			frame{"testing.tRunner", 0},
-		}},
-		eventDesc{trace.EvGoSleep, []frame{
-			frame{"time.Sleep", 0},
-			frame{"runtime/pprof_test.TestTraceSymbolize", 108},
-			frame{"testing.tRunner", 0},
-		}},
-	}
-	// Stacks for the following events are OS-dependent due to OS-specific code in net package.
-	if runtime.GOOS != "windows" && runtime.GOOS != "plan9" {
-		want = append(want, []eventDesc{
-			eventDesc{trace.EvGoBlockNet, []frame{
-				frame{"net.(*netFD).accept", 0},
-				frame{"net.(*TCPListener).AcceptTCP", 0},
-				frame{"net.(*TCPListener).Accept", 0},
-				frame{"runtime/pprof_test.TestTraceSymbolize.func10", 86},
-			}},
-			eventDesc{trace.EvGoSysCall, []frame{
-				frame{"syscall.read", 0},
-				frame{"syscall.Read", 0},
-				frame{"os.(*File).read", 0},
-				frame{"os.(*File).Read", 0},
-				frame{"runtime/pprof_test.TestTraceSymbolize.func11", 101},
-			}},
-		}...)
-	}
-	matched := make([]bool, len(want))
-	for _, ev := range events {
-	wantLoop:
-		for i, w := range want {
-			if matched[i] || w.Type != ev.Type || len(w.Stk) != len(ev.Stk) {
-				continue
-			}
-
-			for fi, f := range ev.Stk {
-				wf := w.Stk[fi]
-				if wf.Fn != f.Fn || wf.Line != 0 && wf.Line != f.Line {
-					continue wantLoop
-				}
-			}
-			matched[i] = true
-		}
-	}
-	for i, m := range matched {
-		if m {
-			continue
-		}
-		w := want[i]
-		t.Errorf("did not match event %v at %v:%v", trace.EventDescriptions[w.Type].Name, w.Stk[0].Fn, w.Stk[0].Line)
-		t.Errorf("seen the following events of this type:")
-		for _, ev := range events {
-			if ev.Type != w.Type {
-				continue
-			}
-			for _, f := range ev.Stk {
-				t.Logf("  %v:%v", f.Fn, f.Line)
-			}
-			t.Logf("---")
-		}
-	}
-}