} else {
			gs.stop(ev.Time(), ev.Stack(), ctx)
		}
	}
	if !from.Executing() && to.Executing() {
		start := ev.Time()
		if from == trace.GoUndetermined {
			// Back-date the event to the start of the trace.
			start = ctx.startTime
		}
		gs.start(start, ev.Thread(), ctx)
	}

	if from == trace.GoWaiting {
		// Goroutine was unblocked.
		gs.unblock(ev.Time(), ev.Stack(), ev.Thread(), ctx)

// symbols with names matching the regular expression.
//
// Alternate usage:
//
//	go tool objdump binary start end
//
// In this mode, objdump disassembles the binary starting at the start address and
// stopping at the end address. The start and end addresses are program
// counters written in hexadecimal with optional leading 0x prefix.
// In this mode, objdump prints a sequence of stanzas of the form:

type interval struct {
	start, end trace.Time
}

func (i interval) duration() time.Duration {
	return i.end.Sub(i.start)
}

func (i1 interval) overlap(i2 interval) time.Duration {
	// Assume start1 <= end1 and start2 <= end2
	if i1.end < i2.start || i2.end < i1.start {
		return 0
	}
	if i1.start < i2.start { // choose the later one
		i1.start = i2.start
	}

	// is a linux kernel, relocationSymbol is the name of the symbol
	// corresponding to the start address.
	Open(file string, start, limit, offset uint64, relocationSymbol string) (ObjFile, error)

	// Disasm disassembles the named object file, starting at
	// the start address and stopping at (before) the end address.
	Disasm(file string, start, end uint64, intelSyntax bool) ([]Inst, error)
}

	}

	return &taskFilter{name: strings.Join(name, ","), cond: conditions}, nil
}

func taskInterval(t *parsedTrace, s *trace.UserTaskSummary) interval {
	var i interval
	if s.Start != nil {
		i.start = s.Start.Time()
	} else {
		i.start = t.startTime()
	}
	if s.End != nil {
		i.end = s.End.Time()
	} else {
		i.end = t.endTime()
	}
	return i
}

}

// start indicates that a goroutine has started running on a proc.
func (gs *gState[R]) start(ts trace.Time, resource R, ctx *traceContext) {
	// Set the time for all the active ranges.
	for name := range gs.activeRanges {
		gs.activeRanges[name] = activeRange{ts, trace.NoStack}
	}

	if gs.startCause.name != "" {
		// It has a start cause. Emit a flow event.

}

func (*objTool) Open(name string, start, limit, offset uint64, relocationSymbol string) (driver.ObjFile, error) {
	of, err := objfile.Open(name)
	if err != nil {
		return nil, err
	}
	f := &file{
		name: name,
		file: of,
	}
	if start != 0 {
		if load, err := of.LoadAddress(); err == nil {
			f.offset = start - load
		}
	}
	return f, nil
}

	// work.
	var period int
	// slash+1: if there's no slash, the value is -1 and start is 0; otherwise
	// start is the byte after the slash.
	for start := slash + 1; start < len(arg); start = period + 1 {
		period = strings.Index(arg[start:], ".")
		symbol := ""
		if period < 0 {
			period = len(arg)
		} else {
			period += start
			symbol = arg[period+1:]
		}
		// Have we identified a package already?

func (r *rewriter) assertReady(start syntax.Pos, loop *forLoop) syntax.Stmt {
	nif := &syntax.IfStmt{
		Cond: r.cond(syntax.Neq, r.useObj(loop.stateVar), r.stateConst(abi.RF_READY)),
		Then: &syntax.BlockStmt{
			List: []syntax.Stmt{r.callPanic(start, r.useObj(loop.stateVar))},
		},
	}
	setPos(nif, start)
	return nif
}

func (r *rewriter) callPanic(start syntax.Pos, arg syntax.Expr) syntax.Stmt {

	// signatures. A goroutine is used to preprocess the input by merging
	// lines, removing spaces in hex values and identifying the start of
	// new keys and signature blocks.
	const newKeyMarker = "START NEW KEY"
	const newSignatureMarker = "START NEW SIGNATURE"

	values := make(chan string)

	go func() {
		defer close(values)
		scanner := bufio.NewScanner(bzip2.NewReader(inFile))