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                # 退出正在調試的函數 ## 例子 #include <stdio.h> int func(void) { int i = 0; i += 2; i *= 10; return i; } int main(void) { int a = 0; a = func(); printf("%d\n", a); return 0; } ## 技巧 當單步調試一個函數時,如果不想繼續跟蹤下去了,可以有兩種方式退出。 第一種用“`finish`”命令,這樣函數會繼續執行完,并且打印返回值,然后等待輸入接下來的命令。以上面代碼為例: (gdb) n 17 a = func(); (gdb) s func () at a.c:5 5 int i = 0; (gdb) n 7 i += 2; (gdb) fin find finish (gdb) finish Run till exit from #0 func () at a.c:7 0x08050978 in main () at a.c:17 17 a = func(); Value returned is $1 = 20 可以看到當不想再繼續跟蹤`func`函數時,執行完“`finish`”命令,gdb會打印結果:“`20`”,然后停在那里。 詳情參見[gdb手冊](https://sourceware.org/gdb/onlinedocs/gdb/Continuing-and-Stepping.html) 第二種用“`return`”命令,這樣函數不會繼續執行下面的語句,而是直接返回。也可以用“`return expression`”命令指定函數的返回值。仍以上面代碼為例: (gdb) n 17 a = func(); (gdb) s func () at a.c:5 5 int i = 0; (gdb) n 7 i += 2; (gdb) n 8 i *= 10; (gdb) re record remove-inferiors return reverse-next reverse-step refresh remove-symbol-file reverse-continue reverse-nexti reverse-stepi remote restore reverse-finish reverse-search (gdb) return 40 Make func return now? (y or n) y #0 0x08050978 in main () at a.c:17 17 a = func(); (gdb) n 18 printf("%d\n", a); (gdb) 40 19 return 0; 可以看到“`return`”命令退出了函數并且修改了函數的返回值。 詳情參見[gdb手冊](https://sourceware.org/gdb/onlinedocs/gdb/Returning.html#Returning) ## 貢獻者 nanxiao
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