Fix: don't use cargo-count.

[efenniht]

cargo-count 에는 unsafe 로 시작하는 문장을 생략하는 버그 (kbknapp/cargo-count#38) 가 있어서, 다른 도구를 새로 만들었습니다. (https://github.com/efenniht/count-unsafe)

rv6 의 경우 unsafe line 은 41.7% 입니다.

kernel-rs/src/sysfile.rs : 314/336 = 93
kernel-rs/src/sysproc.rs : 45/54 = 83
kernel-rs/src/virtio.rs : 6/76 = 7
kernel-rs/src/memlayout.rs : 0/34 = 0
kernel-rs/src/start.rs : 34/57 = 59
kernel-rs/src/riscv.rs : 154/275 = 56
kernel-rs/src/trap.rs : 122/142 = 85
kernel-rs/src/sleepablelock.rs : 13/73 = 17
kernel-rs/src/uart.rs : 11/155 = 7
kernel-rs/src/syscall.rs : 87/97 = 89
kernel-rs/src/utils.rs : 0/7 = 0
kernel-rs/src/etrace.rs : 0/117 = 0
kernel-rs/src/plic.rs : 18/22 = 81
kernel-rs/src/vm.rs : 333/508 = 65
kernel-rs/src/fcntl.rs : 0/9 = 0
kernel-rs/src/param.rs : 0/15 = 0
kernel-rs/src/kernel.rs : 47/162 = 29
kernel-rs/src/console.rs : 97/158 = 61
kernel-rs/src/lib.rs : 0/56 = 0
kernel-rs/src/kalloc.rs : 22/45 = 48
kernel-rs/src/exec.rs : 145/215 = 67
kernel-rs/src/arena.rs : 79/386 = 20
kernel-rs/src/string.rs : 28/28 = 100
kernel-rs/src/poweroff.rs : 3/10 = 30
kernel-rs/src/page.rs : 5/64 = 7
kernel-rs/src/bio.rs : 13/120 = 10
kernel-rs/src/sleeplock.rs : 13/92 = 14
kernel-rs/src/file.rs : 86/171 = 50
kernel-rs/src/virtio_disk.rs : 128/287 = 44
kernel-rs/src/proc.rs : 338/646 = 52
kernel-rs/src/spinlock.rs : 34/141 = 24
kernel-rs/src/pipe.rs : 121/163 = 74
kernel-rs/src/stat.rs : 0/12 = 0
kernel-rs/src/fs/path.rs : 0/98 = 0
kernel-rs/src/fs/inode.rs : 0/411 = 0
kernel-rs/src/fs/log.rs : 0/147 = 0
kernel-rs/src/fs/mod.rs : 0/84 = 0
kernel-rs/src/fs/superblock.rs : 0/30 = 0
Total:
2296/5503 (41.7%)

Hafnium 의 경우 27.3% 입니다.

hfo2/src/spci.rs : 3/135 = 2
hfo2/src/dlog.rs : 21/60 = 35
hfo2/src/std.rs : 81/92 = 88
hfo2/src/abi.rs : 0/108 = 0
hfo2/src/list.rs : 29/47 = 61
hfo2/src/memiter.rs : 70/123 = 56
hfo2/src/manifest.rs : 17/468 = 3
hfo2/src/boot_flow.rs : 5/63 = 7
hfo2/src/utils.rs : 0/74 = 0
hfo2/src/fdt.rs : 86/414 = 20
hfo2/src/init.rs : 104/134 = 77
hfo2/src/vm.rs : 69/402 = 17
hfo2/src/addr.rs : 5/95 = 5
hfo2/src/cpio.rs : 13/58 = 22
hfo2/src/mm.rs : 259/916 = 28
hfo2/src/slist.rs : 27/69 = 39
hfo2/src/cpu.rs : 120/405 = 29
hfo2/src/load.rs : 178/238 = 74
hfo2/src/lib.rs : 0/54 = 0
hfo2/src/hypervisor.rs : 35/536 = 6
hfo2/src/types.rs : 0/32 = 0
hfo2/src/boot_params.rs : 1/66 = 1
hfo2/src/page.rs : 23/112 = 20
hfo2/src/mpool.rs : 87/236 = 36
hfo2/src/api.rs : 165/212 = 77
hfo2/src/panic.rs : 0/16 = 0
hfo2/src/fdt_handler.rs : 246/468 = 52
hfo2/src/spinlock.rs : 31/157 = 19
hfo2/src/layout.rs : 0/15 = 0
hfo2/src/spci_architected_message.rs : 22/271 = 8
hfo2/src/arch/fake.rs : 0/24 = 0
hfo2/src/arch/mod.rs : 0/18 = 0
hfo2/src/arch/aarch64.rs : 0/87 = 0
Total:
1697/6205