log.Printf("failed to generate trace: %v", err)
		}
	})
}

// traceContext is a wrapper around a traceviewer.Emitter with some additional
// information that's useful to most parts of trace viewer JSON emission.
type traceContext struct {
	*traceviewer.Emitter
	startTime trace.Time
	endTime   trace.Time
}

// elapsed returns the elapsed time between the trace time and the start time
// of the trace.

package main

import (
	"fmt"
	"internal/trace"
	"internal/trace/traceviewer"
	"internal/trace/traceviewer/format"
)

var _ generator = &threadGenerator{}

type threadGenerator struct {
	globalRangeGenerator
	globalMetricGenerator
	stackSampleGenerator[trace.ThreadID]
	logEventGenerator[trace.ThreadID]

	gStates map[trace.GoID]*gState[trace.ThreadID]
	threads map[trace.ThreadID]struct{}
}

package main

import (
	"internal/trace"
	"internal/trace/event/go122"
	testgen "internal/trace/internal/testgen/go122"
)

func main() {
	testgen.Main(gen)
}

func gen(t *testgen.Trace) {
	g := t.Generation(1)

	// One goroutine enters a syscall.
	b0 := g.Batch(trace.ThreadID(0), 0)
	b0.Event("ProcStatus", trace.ProcID(0), go122.ProcRunning)
	b0.Event("GoStatus", trace.GoID(1), trace.ThreadID(0), go122.GoRunning)

			switch ev.Kind() {
			case trace.EventLabel:
				ev.Label()
			case trace.EventLog:
				ev.Log()
			case trace.EventMetric:
				ev.Metric()
			case trace.EventRangeActive, trace.EventRangeBegin:
				ev.Range()
			case trace.EventRangeEnd:
				ev.Range()
				ev.RangeAttributes()
			case trace.EventStateTransition:
				ev.StateTransition()
			case trace.EventRegionBegin, trace.EventRegionEnd:
				ev.Region()

                trace = trace.tail ?: break
            }
        }

    private
    val tail: PropertyTrace?
        get() = when (this) {
            is Bean -> trace
            is Property -> trace
            is SystemProperty -> trace
            is Project -> trace
            else -> null
        }
}


enum class PropertyKind {
    Field {

package main

import (
	"internal/trace"
	"internal/trace/event/go122"
	testgen "internal/trace/internal/testgen/go122"
)

func main() {
	testgen.Main(gen)
}

func gen(t *testgen.Trace) {
	g1 := t.Generation(1)

	// A running goroutine blocks.
	b10 := g1.Batch(trace.ThreadID(0), 0)
	b10.Event("ProcStatus", trace.ProcID(0), go122.ProcRunning)
	b10.Event("GoStatus", trace.GoID(1), trace.ThreadID(0), go122.GoRunning)

package main

import (
	"fmt"
	"internal/trace"
	"internal/trace/traceviewer"
	"internal/trace/traceviewer/format"
	"strings"
)

// resource is a generic constraint interface for resource IDs.
type resource interface {
	trace.GoID | trace.ProcID | trace.ThreadID
}

// noResource indicates the lack of a resource.
const noResource = -1

// gState represents the trace viewer state of a goroutine in a trace.
//

	rbrace := p.expect2(token.RBRACE)

	return &ast.BlockStmt{Lbrace: lbrace, List: list, Rbrace: rbrace}
}

func (p *parser) parseBlockStmt() *ast.BlockStmt {
	if p.trace {
		defer un(trace(p, "BlockStmt"))
	}

	lbrace := p.expect(token.LBRACE)
	list := p.parseStmtList()
	rbrace := p.expect2(token.RBRACE)

	return &ast.BlockStmt{Lbrace: lbrace, List: list, Rbrace: rbrace}
}

	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)

	trace.cpuLogRead[1].close()
	trace.cpuSleep.wake()

	// Wait until the logger goroutine exits.
	<-trace.cpuLogDone

	// Clear state for the next trace.
	trace.cpuLogDone = nil
	trace.cpuLogRead[0] = nil
	trace.cpuLogRead[1] = nil
	trace.cpuSleep.close()
}

// traceReadCPU attempts to read from the provided profBuf[gen%2] and write
// into the trace. Returns true if there might be more to read or false