filenames <- filename
			nfiles++
		}
		return nil
	}

	// test Go files provided via -files, if any
	if *files != "" {
		for _, filename := range strings.Split(*files, ",") {
			fi, err := os.Stat(filename)
			handleFile(filename, fs.FileInfoToDirEntry(fi), err)
		}
		return // ignore files under -root
	}

	// otherwise, test all Go files under *root
	goroot := *root

		if err != nil {
			t.Fatal(err)
		}
	}
}

// generateUsageTestFiles create nFolders * nFiles files of size bytes each.
func generateUsageTestFiles(t *testing.T, base, bucket string, nFolders, nFiles, size int) {
	pl := make([]byte, size)
	for i := 0; i < nFolders; i++ {
		name := filepath.Join(base, bucket, fmt.Sprint(i), "0.txt")
		err := os.MkdirAll(filepath.Dir(name), os.ModePerm)
		if err != nil {

		}
		sort.Sort(entries)
		total := uint64(0)            // sum over files of maxline(file) - minline(file)
		maxfile := int32(0)           // max(file indices)
		minline := uint32(0xffffffff) // min over files of minline(file)
		maxline := uint32(0)          // max over files of maxline(file)
		for _, v := range entries {
			if f.pass.stats > 1 {
				f.LogStat("file", v.f, "low", v.lp.first, "high", v.lp.last)
			}

	{"kern.mbstat", []_C_int{1, 59}},
	{"kern.msgbuf", []_C_int{1, 48}},
	{"kern.msgbufsize", []_C_int{1, 38}},
	{"kern.nchstats", []_C_int{1, 41}},
	{"kern.netlivelocks", []_C_int{1, 76}},
	{"kern.nfiles", []_C_int{1, 56}},
	{"kern.ngroups", []_C_int{1, 18}},
	{"kern.nosuidcoredump", []_C_int{1, 32}},
	{"kern.nprocs", []_C_int{1, 47}},
	{"kern.nthreads", []_C_int{1, 26}},
	{"kern.numvnodes", []_C_int{1, 58}},

			f(cu, fi.File(i))
		}
		for i, ninl := 0, int(fi.NumInlTree()); i < ninl; i++ {
			call := fi.InlTree(i)
			f(cu, call.File)
		}
	}
}

// generateFilenameTabs creates LUTs needed for filename lookup. Returns a slice
// of the index at which each CU begins in runtime.cutab.
//
// Function objects keep track of the files they reference to print the stack.

	{"kern.mbstat", []_C_int{1, 59}},
	{"kern.msgbuf", []_C_int{1, 48}},
	{"kern.msgbufsize", []_C_int{1, 38}},
	{"kern.nchstats", []_C_int{1, 41}},
	{"kern.netlivelocks", []_C_int{1, 76}},
	{"kern.nfiles", []_C_int{1, 56}},
	{"kern.ngroups", []_C_int{1, 18}},
	{"kern.nosuidcoredump", []_C_int{1, 32}},
	{"kern.nprocs", []_C_int{1, 47}},
	{"kern.nthreads", []_C_int{1, 26}},
	{"kern.numvnodes", []_C_int{1, 58}},

	{"kern.mbstat", []_C_int{1, 59}},
	{"kern.msgbuf", []_C_int{1, 48}},
	{"kern.msgbufsize", []_C_int{1, 38}},
	{"kern.nchstats", []_C_int{1, 41}},
	{"kern.netlivelocks", []_C_int{1, 76}},
	{"kern.nfiles", []_C_int{1, 56}},
	{"kern.ngroups", []_C_int{1, 18}},
	{"kern.nosuidcoredump", []_C_int{1, 32}},
	{"kern.nprocs", []_C_int{1, 47}},
	{"kern.nthreads", []_C_int{1, 26}},
	{"kern.numvnodes", []_C_int{1, 58}},

	{"kern.mbstat", []_C_int{1, 59}},
	{"kern.msgbuf", []_C_int{1, 48}},
	{"kern.msgbufsize", []_C_int{1, 38}},
	{"kern.nchstats", []_C_int{1, 41}},
	{"kern.netlivelocks", []_C_int{1, 76}},
	{"kern.nfiles", []_C_int{1, 56}},
	{"kern.ngroups", []_C_int{1, 18}},
	{"kern.nosuidcoredump", []_C_int{1, 32}},
	{"kern.nprocs", []_C_int{1, 47}},
	{"kern.nthreads", []_C_int{1, 26}},
	{"kern.numvnodes", []_C_int{1, 58}},

	{"kern.mbstat", []_C_int{1, 59}},
	{"kern.msgbuf", []_C_int{1, 48}},
	{"kern.msgbufsize", []_C_int{1, 38}},
	{"kern.nchstats", []_C_int{1, 41}},
	{"kern.netlivelocks", []_C_int{1, 76}},
	{"kern.nfiles", []_C_int{1, 56}},
	{"kern.ngroups", []_C_int{1, 18}},
	{"kern.nosuidcoredump", []_C_int{1, 32}},
	{"kern.nprocs", []_C_int{1, 47}},
	{"kern.nthreads", []_C_int{1, 26}},
	{"kern.numvnodes", []_C_int{1, 58}},

	{"kern.mbstat", []_C_int{1, 59}},
	{"kern.msgbuf", []_C_int{1, 48}},
	{"kern.msgbufsize", []_C_int{1, 38}},
	{"kern.nchstats", []_C_int{1, 41}},
	{"kern.netlivelocks", []_C_int{1, 76}},
	{"kern.nfiles", []_C_int{1, 56}},
	{"kern.ngroups", []_C_int{1, 18}},
	{"kern.nosuidcoredump", []_C_int{1, 32}},
	{"kern.nprocs", []_C_int{1, 47}},
	{"kern.nselcoll", []_C_int{1, 43}},
	{"kern.nthreads", []_C_int{1, 26}},