go122-fail-first-gen-first.go

     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 #55160.
     6  //
     7  // The issue is that the parser reads ahead to the first batch of the
     8  // next generation to find generation boundaries, but if it finds an
     9  // error, it needs to delay handling that error until later. Previously
    10  // it would handle that error immediately and a totally valid generation
    11  // would be skipped for parsing and rejected because of an error in a
    12  // batch in the following generation.
    13  //
    14  // This test captures this behavior by making both the first generation
    15  // and second generation bad. It requires that the issue in the first
    16  // generation, which is caught when actually ordering events, be reported
    17  // instead of the second one.
    18  
    19  package main
    20  
    21  import (
    22  	"internal/trace/internal/testgen"
    23  	"internal/trace/tracev2"
    24  	"internal/trace/version"
    25  )
    26  
    27  func main() {
    28  	testgen.Main(version.Go122, gen)
    29  }
    30  
    31  func gen(t *testgen.Trace) {
    32  	// A running goroutine emits a task begin.
    33  	t.RawEvent(tracev2.EvEventBatch, nil, 1 /*gen*/, 0 /*thread ID*/, 0 /*timestamp*/, 5 /*batch length*/)
    34  	t.RawEvent(tracev2.EvFrequency, nil, 15625000)
    35  
    36  	// A running goroutine emits a task begin.
    37  	t.RawEvent(tracev2.EvEventBatch, nil, 1 /*gen*/, 0 /*thread ID*/, 0 /*timestamp*/, 5 /*batch length*/)
    38  	t.RawEvent(tracev2.EvGoCreate, nil, 0 /*timestamp delta*/, 1 /*go ID*/, 0, 0)
    39  
    40  	// Write an invalid batch event for the next generation.
    41  	t.RawEvent(tracev2.EvEventBatch, nil, 2 /*gen*/, 0 /*thread ID*/, 0 /*timestamp*/, 50 /*batch length (invalid)*/)
    42  
    43  	// We should fail at the first issue, not the second one.
    44  	t.ExpectFailure("expected a proc but didn't have one")
    45  }
    46
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