如何在 GNU cflow 中顯示“僅”定義的函數？

Question

我有一個這樣的C文件：

// SPDX-License-Identifier: GPL-2.0
#include <linux/ieee80211.h>
#include <linux/export.h>
#include <net/cfg80211.h>
#include "nl80211.h"
#include "core.h"
#include "rdev-ops.h"

int __cfg80211_stop_ap(struct cfg80211_registered_device *rdev,
               struct net_device *dev, bool notify)
{
    struct wireless_dev *wdev = dev->ieee80211_ptr;
    int err;

    ASSERT_WDEV_LOCK(wdev);

    if (!rdev->ops->stop_ap)
        return -EOPNOTSUPP;

    if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_AP &&
        dev->ieee80211_ptr->iftype != NL80211_IFTYPE_P2P_GO)
        return -EOPNOTSUPP;

    if (!wdev->beacon_interval)
        return -ENOENT;

    err = rdev_stop_ap(rdev, dev);
    if (!err) {
        wdev->conn_owner_nlportid = 0;
        wdev->beacon_interval = 0;
        memset(&wdev->chandef, 0, sizeof(wdev->chandef));
        wdev->ssid_len = 0;
        rdev_set_qos_map(rdev, dev, NULL);
        if (notify)
            nl80211_send_ap_stopped(wdev);

        /* Should we apply the grace period during beaconing interface
         * shutdown also?
         */
        cfg80211_sched_dfs_chan_update(rdev);
    }

    schedule_work(&cfg80211_disconnect_work);

    return err;
}

int cfg80211_stop_ap(struct cfg80211_registered_device *rdev,
             struct net_device *dev, bool notify)
{
    struct wireless_dev *wdev = dev->ieee80211_ptr;
    int err;

    wdev_lock(wdev);
    err = __cfg80211_stop_ap(rdev, dev, notify);
    wdev_unlock(wdev);

    return err;
}

執行命令cflow 后： cflow ap.c -i_ -d2 --omit-arguments --omit-symbol-name ，我得到輸出：

__cfg80211_stop_ap() <int () at ap.c:9>:
    ASSERT_WDEV_LOCK()
    rdev_stop_ap()
    memset()
    rdev_set_qos_map()
    nl80211_send_ap_stopped()
    cfg80211_sched_dfs_chan_update()
    schedule_work()
cfg80211_stop_ap() <int () at ap.c:48>:
    wdev_lock()
    __cfg80211_stop_ap() <int () at ap.c:9>:
    wdev_unlock()

我想要的是不應顯示文件中未找到的函數。 我希望我的輸出如下：

__cfg80211_stop_ap() <int () at ap.c:9>:
cfg80211_stop_ap() <int () at ap.c:48>:
    __cfg80211_stop_ap() <int () at ap.c:9>:

Answer 1

您可以將其通過管道傳輸到 perl 過濾器，如下所示：

cflow ap.c | perl -e 'while(<>){if(/at ap.c/){print;}}'

Answer 2

基於 Valter 的回答，這里有一個帶有sed過濾的版本：

cflow --brief --omit-arguments --omit-symbol-names --no-main stream_buffer.c 2>/dev/null | sed -n '/stream_buffer.c/p'

2>/dev/null部分是為了抑制缺少定義的錯誤（當某些函數在其他文件中定義時預期）。

您可以將其封裝在一個方便的腳本中，這樣您就不必重復輸入文件名：

cat cflowfile.sh                          
cflow --brief --omit-arguments --omit-symbol-names --no-main $1 2>/dev/null | sed -n '/'$1'/p' | sed -n 's/ <.*//p'

這是在 FreeRTOS 的stream_buffer.c上運行它的stream_buffer.c ：

./cflowfile.sh stream_buffer.c

ucStreamBufferGetStreamBufferType()
uxStreamBufferGetStreamBufferNumber()
vStreamBufferDelete()
vStreamBufferSetStreamBufferNumber()
xStreamBufferBytesAvailable()
    prvBytesInBuffer()
xStreamBufferGenericCreateStatic()
    prvInitialiseNewStreamBuffer()
xStreamBufferIsEmpty()
xStreamBufferIsFull()
    xStreamBufferSpacesAvailable()
xStreamBufferNextMessageLengthBytes()
    prvBytesInBuffer()
    prvReadBytesFromBuffer()
xStreamBufferReceive()
    prvBytesInBuffer()
    prvReadMessageFromBuffer()
        prvReadBytesFromBuffer()
xStreamBufferReceiveCompletedFromISR()
xStreamBufferReceiveFromISR()
    prvBytesInBuffer()
    prvReadMessageFromBuffer()
xStreamBufferReset()
    prvInitialiseNewStreamBuffer()
xStreamBufferSend()
    xStreamBufferSpacesAvailable()
    prvWriteMessageToBuffer()
        prvWriteBytesToBuffer()
    prvBytesInBuffer()
xStreamBufferSendCompletedFromISR()
xStreamBufferSendFromISR()
    xStreamBufferSpacesAvailable()
    prvWriteMessageToBuffer()
    prvBytesInBuffer()
xStreamBufferSetTriggerLevel()

不幸的是，我還沒有找到使用cflow s --reverse選項來做到這一點的好方法。 這可能需要自定義后處理腳本來反轉上述輸出，而不是簡單地在 cflow 中使用--reverse標志。 理想情況下，我們能夠生成如下輸出：

./todo-cflowfile-reverse.sh stream_buffer.c

prvBytesInBuffer()
  xStreamBufferBytesAvailable()
  xStreamBufferNextMessageLengthBytes()
  xStreamBufferReceive()
  xStreamBufferReceiveFromISR()
  xStreamBufferSend()
  xStreamBufferSendFromISR()
prvReadBytesFromBuffer()
  prvReadMessageFromBuffer()
    xStreamBufferReceive()
    xStreamBufferReceiveFromISR()
  xStreamBufferNextMessageLengthBytes()
prvInitialiseNewStreamBuffer()
  xStreamBufferGenericCreateStatic()
  xStreamBufferReset()
prvWriteBytesToBuffer()
  prvWriteMessageToBuffer()
    xStreamBufferSend()
    xStreamBufferSendFromISR()
xStreamBufferSpacesAvailable()
  xStreamBufferIsFull()
  xStreamBufferSend()
  xStreamBufferSendFromISR()