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// Copyright 2023 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.
//go:build cgo
package runtime_test
import (
"bytes"
"fmt"
"internal/goexperiment"
"internal/testenv"
"internal/trace"
tracev2 "internal/trace/v2"
"io"
"os"
"runtime"
"strings"
"testing"
)
// TestTraceUnwindCGO verifies that trace events emitted in cgo callbacks
// produce the same stack traces and don't cause any crashes regardless of
// tracefpunwindoff being set to 0 or 1.
func TestTraceUnwindCGO(t *testing.T) {
if *flagQuick {
t.Skip("-quick")
}
testenv.MustHaveGoBuild(t)
t.Parallel()
exe, err := buildTestProg(t, "testprogcgo")
if err != nil {
t.Fatal(err)
}
wantLogs := []string{
"goCalledFromC",
"goCalledFromCThread",
}
logs := make(map[string]*trace.Event)
for _, category := range wantLogs {
logs[category] = nil
}
logsV2 := make(map[string]*tracev2.Event)
for _, category := range wantLogs {
logsV2[category] = nil
}
for _, tracefpunwindoff := range []int{1, 0} {
env := fmt.Sprintf("GODEBUG=tracefpunwindoff=%d", tracefpunwindoff)
got := runBuiltTestProg(t, exe, "Trace", env)
prefix, tracePath, found := strings.Cut(got, ":")
if !found || prefix != "trace path" {
t.Fatalf("unexpected output:\n%s\n", got)
}
defer os.Remove(tracePath)
traceData, err := os.ReadFile(tracePath)
if err != nil {
t.Fatalf("failed to read trace: %s", err)
}
if goexperiment.ExecTracer2 {
for category := range logs {
event := mustFindLogV2(t, bytes.NewReader(traceData), category)
if wantEvent := logsV2[category]; wantEvent == nil {
logsV2[category] = &event
} else if got, want := dumpStackV2(&event), dumpStackV2(wantEvent); got != want {
t.Errorf("%q: got stack:\n%s\nwant stack:\n%s\n", category, got, want)
}
}
} else {
events := parseTrace(t, bytes.NewReader(traceData))
for category := range logs {
event := mustFindLog(t, events, category)
if wantEvent := logs[category]; wantEvent == nil {
logs[category] = event
} else if got, want := dumpStack(event), dumpStack(wantEvent); got != want {
t.Errorf("%q: got stack:\n%s\nwant stack:\n%s\n", category, got, want)
}
}
}
}
}
// mustFindLog returns the EvUserLog event with the given category in events. It
// fails if no event or multiple events match the category.
func mustFindLog(t *testing.T, events []*trace.Event, category string) *trace.Event {
t.Helper()
var candidates []*trace.Event
for _, e := range events {
if e.Type == trace.EvUserLog && len(e.SArgs) >= 1 && e.SArgs[0] == category {
candidates = append(candidates, e)
}
}
if len(candidates) == 0 {
t.Errorf("could not find log with category: %q", category)
} else if len(candidates) > 1 {
t.Errorf("found more than one log with category: %q", category)
}
return candidates[0]
}
// dumpStack returns e.Stk as a string.
func dumpStack(e *trace.Event) string {
var buf bytes.Buffer
for _, f := range e.Stk {
file := strings.TrimPrefix(f.File, runtime.GOROOT())
fmt.Fprintf(&buf, "%s\n\t%s:%d\n", f.Fn, file, f.Line)
}
return buf.String()
}
// parseTrace parses the given trace or skips the test if the trace is broken
// due to known issues. Partially copied from runtime/trace/trace_test.go.
func parseTrace(t *testing.T, r io.Reader) []*trace.Event {
res, err := trace.Parse(r, "")
if err == trace.ErrTimeOrder {
t.Skipf("skipping trace: %v", err)
}
if err != nil {
t.Fatalf("failed to parse trace: %v", err)
}
return res.Events
}
func mustFindLogV2(t *testing.T, trace io.Reader, category string) tracev2.Event {
r, err := tracev2.NewReader(trace)
if err != nil {
t.Fatalf("bad trace: %v", err)
}
var candidates []tracev2.Event
for {
ev, err := r.ReadEvent()
if err == io.EOF {
break
}
if err != nil {
t.Fatalf("failed to parse trace: %v", err)
}
if ev.Kind() == tracev2.EventLog && ev.Log().Category == category {
candidates = append(candidates, ev)
}
}
if len(candidates) == 0 {
t.Fatalf("could not find log with category: %q", category)
} else if len(candidates) > 1 {
t.Fatalf("found more than one log with category: %q", category)
}
return candidates[0]
}
// dumpStack returns e.Stack() as a string.
func dumpStackV2(e *tracev2.Event) string {
var buf bytes.Buffer
e.Stack().Frames(func(f tracev2.StackFrame) bool {
file := strings.TrimPrefix(f.File, runtime.GOROOT())
fmt.Fprintf(&buf, "%s\n\t%s:%d\n", f.Func, file, f.Line)
return true
})
return buf.String()
}
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