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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.
// Regression test for an issue found in development.
//
// The issue is that EvUserTaskEnd events don't carry the
// task type with them, so the parser needs to track that
// information. But if the parser just tracks the string ID
// and not the string itself, that string ID may not be valid
// for use in future generations.
package main
import (
"internal/trace/v2"
"internal/trace/v2/event/go122"
testgen "internal/trace/v2/internal/testgen/go122"
)
func main() {
testgen.Main(gen)
}
func gen(t *testgen.Trace) {
g1 := t.Generation(1)
// A running goroutine emits a task begin.
b1 := g1.Batch(trace.ThreadID(0), 0)
b1.Event("ProcStatus", trace.ProcID(0), go122.ProcRunning)
b1.Event("GoStatus", trace.GoID(1), trace.ThreadID(0), go122.GoRunning)
b1.Event("UserTaskBegin", trace.TaskID(2), trace.TaskID(0) /* 0 means no parent, not background */, "my task", testgen.NoStack)
g2 := t.Generation(2)
// That same goroutine emits a task end in the following generation.
b2 := g2.Batch(trace.ThreadID(0), 5)
b2.Event("ProcStatus", trace.ProcID(0), go122.ProcRunning)
b2.Event("GoStatus", trace.GoID(1), trace.ThreadID(0), go122.GoRunning)
b2.Event("UserTaskEnd", trace.TaskID(2), testgen.NoStack)
}
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