之前使用編譯器除錯的時候，每次只是用常規的幾個除錯命令。但是本著折騰的原則，今天把 所有的除錯命令 及功能都羅列出來。
語歌 部落格
速覽表在最後：
下面舉例常見比較重要的命令：
再下面有更詳細的示範
如果想要了解更多編譯器除錯的命令： 傳送門
接下來看一下常用的除錯命令用法：
1.apropos
列出與某個單詞或主題相關的偵錯程式命令。
e.g(lldb) apropos po
2.breakpoint
看截圖文件：(lldb) breakpoint
可以簡寫為 br
功能非常強大，下面還有詳細的描述
3.breakpoint
重要
4.print
(lldb) print sums 可以簡寫成 (lldb) p sums
既： print 寫成 p
程式碼中這樣：
var sums = ["0.00","0.00","0.00","0.00"]複製程式碼除錯視窗這樣：
結果：
(lldb) print sums
([String]) $R14 = 4 values {
[0] = "0.00"
[1] = "0.00"
[2] = "0.00"
[3] = "0.00"
}複製程式碼如果你想在命令列列印進位制數：
| 輸入引數 | 表示進位制 (e.g) |
|---|---|
| p/x 66 | (x表示16進位制)(Int) $R17 = 0x0000000000000042 |
| p/t 6 | (t表示2進位制)(Int) $R20 = 0b0000000000000000000000000000000000000000000000000000000000000110 |
| p/c “s” | (c表示字元)(String) $R24 = “s” |
5.expression
直接改變其值,點選繼續執行，執行的結果就是本次賦值後的結果
(lldb) expression sums = ["10.00","0.00","0.00","0.00"]複製程式碼示例：
更多的用法：
以物件的方式來列印：expression -o -- sums可以直接簡寫成這樣: e -o -- sums
其中:e -o -- sums 可以寫成 po ,而且作用是等效的。
process
與程式互動的命令,當然是配合其後面的引數來達到相應的目的 執行 (lldb) process help 如下：
舉個常見栗子：continue -- Continue execution of all threads in the current process.
就是繼續執行程式，當遇到斷點的時候，在 LLDB 中執行就是繼續執行程式
thread
與程式互動的命令,當然是配合其後面的引數來達到相應的目的 執行 (lldb) thread help 如下：
其搭配的引數命令執行的作用後面描繪的相當清楚。
這裡要重點介紹幾個：
* **`(lldb) thread return`** 過早的從堆疊中返回，立即執行返回命令，退出當前堆疊。可以偽裝一些返回資訊等等。從寫一些函式的行為等等。複製程式碼frame
同樣是配合其引數完成除錯
常用的一條命令：lldb) frame info
列印出當前: 工程名字–類名字–函式名字–所在的行數
其它的作用參照引數後面的解釋
看完上面的命令，接下來看編譯器除錯的幾個 常用按鈕
由圖中可以看出用於除錯的 4 個按鈕
-
第一個
continue如遇到如圖所示，就點選後程式就正常執行，如果有其它斷點，就會跳到下一個斷點.ps: 點選它與在
LLDB除錯框裡面輸入
(lldb) process continue作用是一樣的。
c作用效果也是一樣的 -
第二個
step over當遇到一個斷點暫停後，點選該按鈕程式就會一行一行的執行，即使遇到了函式的呼叫也不會進入函式裡面去，而是直接跳過這個函式的執行，如下圖：stepOve 在
115行打了一個斷點，然後點選該按鈕，他會執行116行，再點選後會執行117行，而不會去執行116所呼叫的函式 裡面的行。
ps: 在程式當中與該按鈕作用相同的LLDB命令引數是一樣的命令是：(lldb) n(lldb) next(lldb) thread step-over
作用效果是一樣的 -
第三個
step into.它才是真正意義上的一行一行的執行命令，即使遇到函式的執行，也會跳 進該函式裡面去一行一行的執行程式碼。就是說你想進入函式裡面的時候用它
ps: 在程式當中與該按鈕作用相同的LLDB命令引數是一樣的命令是：
(lldb) thread step-in
(lldb) step
(lldb) s - 第四個
step out如果你進入了一個函式，執行一兩行之後你想跳過該函式就用這個按鈕。其實它的執行就是一個 堆疊的結束。
快速檢視 Xcode 的所有斷點
如圖這是通過點選檢視工程檔案中所有的斷點
那麼通過 LLDB 命令來檢視所有的斷點：(lldb) br list 或者 (lldb) br li 也可以達到相同的目的
在偵錯程式中通過 LLDB 快速建立斷點
使用下面的命令完成了 115行 斷點的設定(lldb) breakpoint set -f ViewController.swift -l 115
這個時候我們執行 continue 按鈕會發現跳到 115行斷點了。
我們通過大列表檢視 b 其介紹是：
Set a breakpoint using one of several shorthand formats.
設定斷點的命令是：(lldb) b ViewController.swift:127 在127 處設定了斷點
Xcode UI 畫面上有條件的執行 斷點
如圖：
由圖可看：
第1步：我們在 line 24 的地方打了一個斷點。
第2步：我們看到標 2 的框框，這裡 i==2 表示當 i等於2的時候才會執行這個斷點
第3步：我們看到標 3 的框框，這裡表示當執行這個斷點的時候，LLDB 會執行 po i 的命令
第4步：我們看到標 4 的框框，當i為2 的時候執行了斷點的列印操作
其中 ignore 表示該斷點第幾次才會真正執行，比如 設定 ignore 為 2 那麼該斷點會在第三次呼叫的時候觸發。
那麼這裡要說明的就是：斷點程式會先 比較 函式執行到該斷點的 次數。然後 再比較條件 ,條件滿足後 執行 LLDB 命令 語句
其中的 ＋ 號可以支援多個 LLDB 命令。
其他的斷點條件及執行的命令，依次類推。
Action 後面的更多作用！
如圖：
1.AppleScript
蘋果的一種指令碼語言，可以在此開始執行
2.Capture GPU Frame
Unity遊戲 方面的除錯。暫時沒有研究 ?
3.Debugger Command
相當於在 LLDB 上直接使用命令
4.Log Message
當執行到該斷點的時候 LLDB 欄中會直接列印這個 hello 的資訊
5.Shell Command
如圖：
當執行該斷點的時候,電腦會讀 Hello world
6.Sound
選擇相應的聲音遇到該斷點會發出相應的聲音，也是挺有意思的。
一些 LLDB 及控制檯外掛，配合外掛及指令碼開發將大大提高開發效率。
隨便打個斷點：
命令列輸入: (lldb) help
快速查詢所以的命令 一覽表
| 命令 | 命令作用描述 | |||
|---|---|---|---|---|
| apropos | — List debugger commands related to a word or subject.(列出與某個單詞或主題相關的偵錯程式命令。) | |||
| breakpoint | — Commands for operating on breakpoints (see `help b` for shorthand.)(斷點的相關操作，詳細看下面) | |||
| bugreport | — Commands for creating domain-specific bug reports.(建立某個特點作用域的bug 命令) | |||
| command | — Commands for managing custom LLDB commands. | |||
| disassemble | — Disassemble specified instructions in the current target. Defaults to the current function for the current thread and stack frame. | |||
| expression | — Evaluate an expression on the current thread. Displays any returned value with LLDB`s default formatting.(直接改變其值,點選繼續執行) | |||
| frame | — Commands for selecting and examing the current thread`s stack frames.(通過命令來檢查當前堆疊的相關資訊。結合後面的命令引數) | |||
| gdb-remote | — Connect to a process via remote GDB server. If no host is specifed, localhost is assumed. | |||
| gui | — Switch into the curses based GUI mode. | |||
| help | — Show a list of all debugger commands, or give details about a specific command. | |||
| kdp-remote | — Connect to a process via remote KDP server. If no UDP port is specified, port 41139 is assumed. | |||
| language | — Commands specific to a source language. | |||
| log | — Commands controlling LLDB internal logging. | |||
| memory | — Commands for operating on memory in the current target process. | |||
| platform | — Commands to manage and create platforms. | |||
| plugin | — Commands for managing LLDB plugins. | |||
| process | — Commands for interacting with processes on the current platform.(配合其包含的命令繼續執行 執行 process help 即可看到) |
|||
| quit | — Quit the LLDB debugger. | |||
| register | — Commands to access registers for the current thread and stack frame. | |||
| script | — Invoke the script interpreter with provided code and display any results. Start the interactive interpreter if no code is supplied. | |||
| settings | — Commands for managing LLDB settings. | |||
| source | — Commands for examining source code described by debug information for the current target process. | |||
| target | — Commands for operating on debugger targets. | |||
| thread | — Commands for operating on one or more threads in the current process.(在當前程式中操作一個或多個執行緒的命令,結合其下面的引數進行。下面有其搭配引數詳細說明) | |||
| type | — Commands for operating on the type system. | |||
| version | — Show the LLDB debugger version.（檢視開發語言的版本） | |||
| watchpoint | — Commands for operating on watchpoints. | |||
| add-dsym | — Add a debug symbol file to one of the target`s current modules by specifying a path to a debug symbols file, or using the options to specify a module to download symbols for. | |||
| attach | — Attach to process by ID or name. | |||
| b | — Set a breakpoint using one of several shorthand formats. | |||
| bt | — Show the current thread`s call stack. Any numeric argument displays at most that many frames. The argument `all` displays all threads. | |||
| c | — Continue execution of all threads in the current process. | |||
| call | — Evaluate an expression on the current thread. Displays any returned value with LLDB`s default formatting. | |||
| continue | — Continue execution of all threads in the current process. | |||
| detach | — Detach from the current target process. | |||
| di | — Disassemble specified instructions in the current target. Defaults to the current function for the current thread and stack frame. | |||
| dis | — Disassemble specified instructions in the current target. Defaults to the current function for the current thread and stack frame. | |||
| display | — Evaluate an expression at every stop (see `help target stop-hook`.) | |||
| down | — Select a newer stack frame. Defaults to moving one frame, a numeric argument can specify an arbitrary number. | |||
| env | — Shorthand for viewing and setting environment variables. | |||
| exit | — Quit the LLDB debugger. | |||
| f | — Select the current stack frame by index from within the current thread (see `thread backtrace`.) | |||
| file | — Create a target using the argument as the main executable. | finish | — Finish executing the current stack frame and stop after returning. Defaults to current thread unless specified. | |
| image | — Commands for accessing information for one or more target modules. | |||
| j | — Set the program counter to a new address. | |||
| jump | — Set the program counter to a new address. | |||
| kill | — Terminate the current target process. | |||
| l | — List relevant source code using one of several shorthand formats. | |||
| list | — List relevant source code using one of several shorthand formats. | |||
| n | — Source level single step, stepping over calls. Defaults to current thread unless specified.(相當於一行一行的執行函式) | |||
| next | — Source level single step, stepping over calls. Defaults to current thread unless specified.（與 n 的作用幾乎一致） | |||
| nexti | — Instruction level single step, stepping over calls. Defaults to current thread unless specified. | |||
| ni | — Instruction level single step, stepping over calls. Defaults to current thread unless specified. | |||
| p | — Evaluate an expression on the current thread. Displays any returned value with LLDB`s default formatting.(可以列印程式中相關引數的值,其屬性狀態) | |||
| parray | — Evaluate an expression on the current thread. Displays any returned value with LLDB`s default formatting.（與 p 相同） | |||
| po | — Evaluate an expression on the current thread. Displays any returned value with formatting controlled by the type`s author.(與 p 的區別是列印的值所帶的引數相對簡潔一點) | |||
| poarray | — Evaluate an expression on the current thread. Displays any returned value with LLDB`s default formatting.（與 p 相同） | |||
| — Evaluate an expression on the current thread. Displays any returned value with LLDB`s default formatting.（與 p 相同） | ||||
| q | — Quit the LLDB debugger. | |||
| r | — Launch the executable in the debugger. | |||
| rbreak | — Sets a breakpoint or set of breakpoints in the executable. | |||
| repl | — Evaluate an expression on the current thread. Displays any returned value with LLDB`s default formatting. | |||
| reveal_load_dev | — Evaluate an expression on the current thread. Displays any returned value with LLDB`s default formatting. | |||
| reveal_load_sim | — Evaluate an expression on the current thread. Displays any returned value with LLDB`s default formatting. | |||
| reveal_start | — Evaluate an expression on the current thread. Displays any returned value with LLDB`s default formatting. | |||
| reveal_stop | — Evaluate an expression on the current thread. Displays any returned value with LLDB`s default formatting. | |||
| run | — Launch the executable in the debugger. | |||
| s | — Source level single step, stepping into calls. Defaults to current thread unless specified.(一步一步執行，即使遇到函式也會進入該函式一步一步執行程式碼) | |||
| si | — Instruction level single step, stepping into calls. Defaults to current thread unless specified. | |||
| sif | — Step through the current block, stopping if you step directly into a function whose name matches the TargetFunctionName. | |||
| step | — Source level single step, stepping into calls. Defaults to current thread unless specified. | |||
| stepi | — Instruction level single step, stepping into calls. Defaults to current thread unless specified. | |||
| t | — Change the currently selected thread. | |||
| tbreak | — Set a one-shot breakpoint using one of several shorthand formats. | |||
| undisplay | — Stop displaying expression at every stop (specified by stop-hook index.) | |||
| up | — Select an older stack frame. Defaults to moving one frame, a numeric argument can specify an arbitrary number. | |||
| x | — Read from the memory of the current target process. | |||