"goCalledFromC",
		"goCalledFromCThread",
	}
	logs := make(map[string]*trace.Event)
	for _, category := range wantLogs {
		logs[category] = nil
	}
	for _, tracefpunwindoff := range []int{1, 0} {
		env := fmt.Sprintf("GODEBUG=tracefpunwindoff=%d", tracefpunwindoff)
		got := runBuiltTestProg(t, exe, "Trace", env)
		prefix, tracePath, found := strings.Cut(got, ":")
		if !found || prefix != "trace path" {

		file = file[len(file)-maxLen:]
	}
	frame.fileID = trace.stringTab[gen%2].put(gen, file)
	return frame
}

// tracefpunwindoff returns true if frame pointer unwinding for the tracer is
// disabled via GODEBUG or not supported by the architecture.
func tracefpunwindoff() bool {
	return debug.tracefpunwindoff != 0 || (goarch.ArchFamily != goarch.AMD64 && goarch.ArchFamily != goarch.ARM64)
}

	{name: "traceallocfree", atomic: &debug.traceallocfree},
	{name: "tracecheckstackownership", value: &debug.traceCheckStackOwnership},
	{name: "tracebackancestors", value: &debug.tracebackancestors},
	{name: "tracefpunwindoff", value: &debug.tracefpunwindoff},
}

func parsedebugvars() {
	// defaults
	debug.cgocheck = 1
	debug.invalidptr = 1
	debug.adaptivestackstart = 1 // set this to 0 to turn larger initial goroutine stacks off

	which goroutines were created, where N limits the number of ancestor goroutines to
	report. This also extends the information returned by runtime.Stack.
	Setting N to 0 will report no ancestry information.

	tracefpunwindoff: setting tracefpunwindoff=1 forces the execution tracer to
	use the runtime's default stack unwinder instead of frame pointer unwinding.
	This increases tracer overhead, but could be helpful as a workaround or for

	}
	if skip > maxSkip {
		print("requested skip=", skip)
		throw("invalid skip value")
	}
	gp := getg()
	mp := acquirem() // we must not be preempted while accessing profstack

	nstk := 1
	if tracefpunwindoff() || gp.m.hasCgoOnStack() {
		mp.profStack[0] = logicalStackSentinel
		if gp.m.curg == nil || gp.m.curg == gp {
			nstk = callers(skip, mp.profStack[1:])
		} else {