1// Copyright 2023 The Go Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style 3// license that can be found in the LICENSE file. 4 5// Regression test for an issue found in development. 6// 7// The issue is that EvUserTaskEnd events don't carry the 8// task type with them, so the parser needs to track that 9// information. But if the parser just tracks the string ID 10// and not the string itself, that string ID may not be valid 11// for use in future generations. 12 13package main 14 15import ( 16 "internal/trace" 17 "internal/trace/event/go122" 18 testgen "internal/trace/internal/testgen/go122" 19) 20 21func main() { 22 testgen.Main(gen) 23} 24 25func gen(t *testgen.Trace) { 26 g1 := t.Generation(1) 27 28 // A running goroutine emits a task begin. 29 b1 := g1.Batch(trace.ThreadID(0), 0) 30 b1.Event("ProcStatus", trace.ProcID(0), go122.ProcRunning) 31 b1.Event("GoStatus", trace.GoID(1), trace.ThreadID(0), go122.GoRunning) 32 b1.Event("UserTaskBegin", trace.TaskID(2), trace.TaskID(0) /* 0 means no parent, not background */, "my task", testgen.NoStack) 33 34 g2 := t.Generation(2) 35 36 // That same goroutine emits a task end in the following generation. 37 b2 := g2.Batch(trace.ThreadID(0), 5) 38 b2.Event("ProcStatus", trace.ProcID(0), go122.ProcRunning) 39 b2.Event("GoStatus", trace.GoID(1), trace.ThreadID(0), go122.GoRunning) 40 b2.Event("UserTaskEnd", trace.TaskID(2), testgen.NoStack) 41} 42