gdb调试工具的使用
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1.gdb调试
- gcc a.c b.c c.c -o app：无法进行gbd调试
- gcc a.c b.c c.c -o app -g：可以进行gdb调试
- -g：会保留函数名和变量名
2.启动gdb
启动方法：gdb 可执行程序的名字，例如gbd app
给程序传参：set args xxx xxx，如下例所示：
cdl@cdl-Inspiron-5421:~/Cpp_Tutorials/GDB/args$ cat test.c /************************************************************************ > File Name: test.c > Author: CurryCoder > Mail: 1217096231@qq.com > Created Time: 2020年05月23日 星期六 10时55分00秒 ************************************************************************/ #include<stdio.h> int main(int argc, const char* argv[]){ printf("args num = %d\n", argc); for(int i = 0; i < argc; i++){ printf("arg%d: %s\n", i, argv[i]); } return 0; } cdl@cdl-Inspiron-5421:~/Cpp_Tutorials/GDB/args$ gcc test.c cdl@cdl-Inspiron-5421:~/Cpp_Tutorials/GDB/args$ cdl@cdl-Inspiron-5421:~/Cpp_Tutorials/GDB/args$ ls a.out test.c cdl@cdl-Inspiron-5421:~/Cpp_Tutorials/GDB/args$ ./a.out args num = 1 arg0: ./a.out cdl@cdl-Inspiron-5421:~/Cpp_Tutorials/GDB/args$ ./a.out abc def gh 000 666 args num = 6 arg0: ./a.out arg1: abc arg2: def arg3: gh arg4: 000 arg5: 666 /********************************************使用gbd开始进行调试*********************************/ cdl@cdl-Inspiron-5421:~/Cpp_Tutorials/GDB/args$ gcc test.c -g -o app cdl@cdl-Inspiron-5421:~/Cpp_Tutorials/GDB/args$ gdb app GNU gdb (Ubuntu 7.11.1-0ubuntu1~16.5) 7.11.1 Copyright (C) 2016 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-linux-gnu". Type "show configuration" for configuration details. For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>. Find the GDB manual and other documentation resources online at: <http://www.gnu.org/software/gdb/documentation/>. For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from app...done. (gdb) set args hello world 666 (gdb) r Starting program: /home/cdl/Cpp_Tutorials/GDB/args/app hello world 666 args num = 4 arg0: /home/cdl/Cpp_Tutorials/GDB/args/app arg1: hello arg2: world arg3: 666 [Inferior 1 (process 30054) exited normally] (gdb) Quit
3.查看代码:list
- 当前文件：
- l
- l 行号
- l 函数名
- 非当前文件：
- l 文件名:行号
- l 文件名:函数名
- 设置显示的行数：
- set listsize n
- show listsize
```
cdl@cdl-Inspiron-5421:~/Cpp_Tutorials/GDB$ ls
app args insert_sort.c main.c makefile mysort select_sort.c sort sort.h
cdl@cdl-Inspiron-5421:~/Cpp_Tutorials/GDB$
cdl@cdl-Inspiron-5421:~/Cpp_Tutorials/GDB$
cdl@cdl-Inspiron-5421:~/Cpp_Tutorials/GDB$ gdb app
GNU gdb (Ubuntu 7.11.1-0ubuntu1~16.5) 7.11.1
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from app...done.
(gdb) l
1 #include <stdio.h>
2 #include "sort.h"
3
4 void main()
5 {
6 int i;
7 //������������
8 int array[] = { 12, 5, 33, 6, 10, 35, 67, 89, 87, 65, 54, 24, 58, 92, 100, 24, 46, 78, 99, 200, 55, 44, 33, 22, 11, 71, 2, 4, 86, 8, 9 };
9 int array2[] = { 12, 5, 33, 6, 10, 35, 67, 89, 87, 65, 54, 24, 58, 92, 100, 24, 46, 78, 99, 200, 55, 44, 33, 22, 11, 71, 2, 4, 86, 8, 9 };
10
(gdb) show listsize 5
Number of source lines gdb will list by default is 10.
(gdb) l
11 //�������鳤��
12 int len = sizeof(array) / sizeof(int);
13 //��������
14 printf("Sort Array:\n");
15 for (i = 0; i < len; ++i)
16 {
17 printf("%d\t", array[i]);
18 }
19 printf("\n");
20
(gdb) set listsize 5
(gdb) l 5
3
4 void main()
5 {
6 int i;
7 //������������
(gdb) Quit
cdl@cdl-Inspiron-5421:~/Cpp_Tutorials/GDB$
cdl@cdl-Inspiron-5421:~/Cpp_Tutorials/GDB$
cdl@cdl-Inspiron-5421:~/Cpp_Tutorials/GDB$ gdb app
GNU gdb (Ubuntu 7.11.1-0ubuntu1~16.5) 7.11.1
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from app...done.
(gdb) l
1 #include <stdio.h>
2 #include "sort.h"
3
4 void main()
5 {
6 int i;
7 //������������
8 int array[] = { 12, 5, 33, 6, 10, 35, 67, 89, 87, 65, 54, 24, 58, 92, 100, 24, 46, 78, 99, 200, 55, 44, 33, 22, 11, 71, 2, 4, 86, 8, 9 };
9 int array2[] = { 12, 5, 33, 6, 10, 35, 67, 89, 87, 65, 54, 24, 58, 92, 100, 24, 46, 78, 99, 200, 55, 44, 33, 22, 11, 71, 2, 4, 86, 8, 9 };
10
(gdb) show listsize
Number of source lines gdb will list by default is 10.
(gdb) set listsize 20
(gdb) l
11 //�������鳤��
12 int len = sizeof(array) / sizeof(int);
13 //��������
14 printf("Sort Array:\n");
15 for (i = 0; i < len; ++i)
16 {
17 printf("%d\t", array[i]);
18 }
19 printf("\n");
20
21 // selectionSort
22 selectionSort(array, len);
23 // printf
24 printf("Selection Sort:\n");
25 for (i = 0; i < len; ++i)
26 {
27 printf("%d ", array[i]);
28 }
29
30 // insertionSort
(gdb) l 5
1 #include <stdio.h>
2 #include "sort.h"
3
4 void main()
5 {
6 int i;
7 //������������
8 int array[] = { 12, 5, 33, 6, 10, 35, 67, 89, 87, 65, 54, 24, 58, 92, 100, 24, 46, 78, 99, 200, 55, 44, 33, 22, 11, 71, 2, 4, 86, 8, 9 };
9 int array2[] = { 12, 5, 33, 6, 10, 35, 67, 89, 87, 65, 54, 24, 58, 92, 100, 24, 46, 78, 99, 200, 55, 44, 33, 22, 11, 71, 2, 4, 86, 8, 9 };
10
11 //�������鳤��
12 int len = sizeof(array) / sizeof(int);
13 //��������
14 printf("Sort Array:\n");
15 for (i = 0; i < len; ++i)
16 {
17 printf("%d\t", array[i]);
18 }
19 printf("\n");
20
(gdb) set listsize 10
(gdb)
(gdb)
(gdb) l 5
1 #include <stdio.h>
2 #include "sort.h"
3
4 void main()
5 {
6 int i;
7 //������������
8 int array[] = { 12, 5, 33, 6, 10, 35, 67, 89, 87, 65, 54, 24, 58, 92, 100, 24, 46, 78, 99, 200, 55, 44, 33, 22, 11, 71, 2, 4, 86, 8, 9 };
9 int array2[] = { 12, 5, 33, 6, 10, 35, 67, 89, 87, 65, 54, 24, 58, 92, 100, 24, 46, 78, 99, 200, 55, 44, 33, 22, 11, 71, 2, 4, 86, 8, 9 };
10
(gdb) l main
1 #include <stdio.h>
2 #include "sort.h"
3
4 void main()
5 {
6 int i;
7 //������������
8 int array[] = { 12, 5, 33, 6, 10, 35, 67, 89, 87, 65, 54, 24, 58, 92, 100, 24, 46, 78, 99, 200, 55, 44, 33, 22, 11, 71, 2, 4, 86, 8, 9 };
9 int array2[] = { 12, 5, 33, 6, 10, 35, 67, 89, 87, 65, 54, 24, 58, 92, 100, 24, 46, 78, 99, 200, 55, 44, 33, 22, 11, 71, 2, 4, 86, 8, 9 };
10
(gdb) l insert_sort.c:15
10 �ȶ���:�����������ȶ���
11
12 ***********************************************/
13
14 //���������㷨(��������)
15 void insertionSort(int *array, int len)
16 {
17 int tmp = 0; // �洢����
18 int index = 0; // �ӵ�λ��
19 // ������������
(gdb) l insert_sort.c:insertionSort
11
12 ***********************************************/
13
14 //���������㷨(��������)
15 void insertionSort(int *array, int len)
16 {
17 int tmp = 0; // �洢����
18 int index = 0; // �ӵ�λ��
19 // ������������
20 for (int i = 1; i < len; ++i)
(gdb) l main.c:main
1 #include <stdio.h>
2 #include "sort.h"
3
4 void main()
5 {
6 int i;
7 //������������
8 int array[] = { 12, 5, 33, 6, 10, 35, 67, 89, 87, 65, 54, 24, 58, 92, 100, 24, 46, 78, 99, 200, 55, 44, 33, 22, 11, 71, 2, 4, 86, 8, 9 };
9 int array2[] = { 12, 5, 33, 6, 10, 35, 67, 89, 87, 65, 54, 24, 58, 92, 100, 24, 46, 78, 99, 200, 55, 44, 33, 22, 11, 71, 2, 4, 86, 8, 9 };
10
(gdb)
```4.断点相关操作:break/b
给当前文件设置断点：
- b 行号
- b 函数名
给非当前文件设置断点：
- b 文件名:行号
- b 文件名:函数名
查看断点：info(i) b
删除断点：d num(断点具体的编号,根据i b得到)
- 删除多个：d num1 num2 或者 d num1-num6
设置断点无效：dis num(断点具体的编号,根据i b得到)
- 多个断点无效：dis num1 num2 或者 dis num1-num6
设置断点生效：ena num(断点具体的编号,根据i b得到)
- 多个断点生效：ena num1 num2 或者 ena num1-num6
设置条件断点：b 行号 if 变量名 == 变量的值
重新从程序开头连续执行：r
执行到下一个断点停住，如果后面没有断点，程序执行结束：c
查看任何东西（变量/函数等）的值：p 变量名/函数名
退出gdb：q
cdl@cdl-Inspiron-5421:~/Cpp_Tutorials/GDB$ gdb app GNU gdb (Ubuntu 7.11.1-0ubuntu1~16.5) 7.11.1 Copyright (C) 2016 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-linux-gnu". Type "show configuration" for configuration details. For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>. Find the GDB manual and other documentation resources online at: <http://www.gnu.org/software/gdb/documentation/>. For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from app...done. (gdb) l 1 #include <stdio.h> 2 #include "sort.h" 3 4 void main() 5 { 6 int i; 7 //������������ 8 int array[] = { 12, 5, 33, 6, 10, 35, 67, 89, 87, 65, 54, 24, 58, 92, 100, 24, 46, 78, 99, 200, 55, 44, 33, 22, 11, 71, 2, 4, 86, 8, 9 }; 9 int array2[] = { 12, 5, 33, 6, 10, 35, 67, 89, 87, 65, 54, 24, 58, 92, 100, 24, 46, 78, 99, 200, 55, 44, 33, 22, 11, 71, 2, 4, 86, 8, 9 }; 10 (gdb) 11 //�������鳤�� 12 int len = sizeof(array) / sizeof(int); 13 //�������� 14 printf("Sort Array:\n"); 15 for (i = 0; i < len; ++i) 16 { 17 printf("%d\t", array[i]); 18 } 19 printf("\n"); 20 (gdb) 21 // selectionSort 22 selectionSort(array, len); 23 // printf 24 printf("Selection Sort:\n"); 25 for (i = 0; i < len; ++i) 26 { 27 printf("%d ", array[i]); 28 } 29 30 // insertionSort (gdb) b 12 Breakpoint 1 at 0x400934: file main.c, line 12. (gdb) b 14 Breakpoint 2 at 0x40093e: file main.c, line 14. (gdb) b 15 Breakpoint 3 at 0x400948: file main.c, line 15. (gdb) b 17 Breakpoint 4 at 0x400954: file main.c, line 17. (gdb) b 19 Breakpoint 5 at 0x400989: file main.c, line 19. (gdb) b 24 Breakpoint 6 at 0x4009aa: file main.c, line 24. (gdb) b 27 Breakpoint 7 at 0x4009c0: file main.c, line 27. (gdb) i b Num Type Disp Enb Address What 1 breakpoint keep y 0x0000000000400934 in main at main.c:12 2 breakpoint keep y 0x000000000040093e in main at main.c:14 3 breakpoint keep y 0x0000000000400948 in main at main.c:15 4 breakpoint keep y 0x0000000000400954 in main at main.c:17 5 breakpoint keep y 0x0000000000400989 in main at main.c:19 6 breakpoint keep y 0x00000000004009aa in main at main.c:24 7 breakpoint keep y 0x00000000004009c0 in main at main.c:27 (gdb) d 1 (gdb) i b Num Type Disp Enb Address What 2 breakpoint keep y 0x000000000040093e in main at main.c:14 3 breakpoint keep y 0x0000000000400948 in main at main.c:15 4 breakpoint keep y 0x0000000000400954 in main at main.c:17 5 breakpoint keep y 0x0000000000400989 in main at main.c:19 6 breakpoint keep y 0x00000000004009aa in main at main.c:24 7 breakpoint keep y 0x00000000004009c0 in main at main.c:27 (gdb) d 2 3 (gdb) i b Num Type Disp Enb Address What 4 breakpoint keep y 0x0000000000400954 in main at main.c:17 5 breakpoint keep y 0x0000000000400989 in main at main.c:19 6 breakpoint keep y 0x00000000004009aa in main at main.c:24 7 breakpoint keep y 0x00000000004009c0 in main at main.c:27 (gdb) d 4-7 (gdb) i b No breakpoints or watchpoints. (gdb) l main 1 #include <stdio.h> 2 #include "sort.h" 3 4 void main() 5 { 6 int i; 7 //������������ 8 int array[] = { 12, 5, 33, 6, 10, 35, 67, 89, 87, 65, 54, 24, 58, 92, 100, 24, 46, 78, 99, 200, 55, 44, 33, 22, 11, 71, 2, 4, 86, 8, 9 }; 9 int array2[] = { 12, 5, 33, 6, 10, 35, 67, 89, 87, 65, 54, 24, 58, 92, 100, 24, 46, 78, 99, 200, 55, 44, 33, 22, 11, 71, 2, 4, 86, 8, 9 }; 10 (gdb) l 11 //�������鳤�� 12 int len = sizeof(array) / sizeof(int); 13 //�������� 14 printf("Sort Array:\n"); 15 for (i = 0; i < len; ++i) 16 { 17 printf("%d\t", array[i]); 18 } 19 printf("\n"); 20 (gdb) l 21 // selectionSort 22 selectionSort(array, len); 23 // printf 24 printf("Selection Sort:\n"); 25 for (i = 0; i < len; ++i) 26 { 27 printf("%d ", array[i]); 28 } 29 30 // insertionSort (gdb) b 17 Breakpoint 8 at 0x400954: file main.c, line 17. (gdb) i b Num Type Disp Enb Address What 8 breakpoint keep y 0x0000000000400954 in main at main.c:17 (gdb) dis 8 (gdb) i b Num Type Disp Enb Address What 8 breakpoint keep n 0x0000000000400954 in main at main.c:17 (gdb) ena 8 (gdb) i b Num Type Disp Enb Address What 8 breakpoint keep y 0x0000000000400954 in main at main.c:17 (gdb) r Starting program: /home/cdl/Cpp_Tutorials/GDB/app Sort Array: Breakpoint 8, main () at main.c:17 17 printf("%d\t", array[i]); (gdb) i b Num Type Disp Enb Address What 8 breakpoint keep y 0x0000000000400954 in main at main.c:17 breakpoint already hit 1 time (gdb) d 8 (gdb) b 17 if i==10 Breakpoint 9 at 0x400954: file main.c, line 17. (gdb) c Continuing. Breakpoint 9, main () at main.c:17 17 printf("%d\t", array[i]); (gdb) p i $1 = 10 (gdb) p main $2 = {void ()} 0x4006ff <main> (gdb) q
5.gdb代码调试相关命令
让gdb跑起来：start(运行一行就停止)或r(停在第一个断点的位置)
打印变量的值: p 变量名
打印变量的类型：ptype 变量名
向下单步调试：n(遇到函数不会进入函数体内部)或s(遇到函数会进入函数体内部)
继续运行gdb，停在下一个断点的位置：c
跳出函数体：finish,如果跳不出去，看一下函数体内部的循环中是否有断点，如果有则删掉或设置无效。
退出gdb: q
变量的自动显示：display 变量名
取消变量的自动显示：undisplay 编号
- 编号的查询：i display
从循环体中直接跳出：until(循环体中不能有断点)
直接设置变量等于某一个值：set var 变量名=变量的值
cdl@cdl-Inspiron-5421:~/Cpp_Tutorials/GDB$ gdb app GNU gdb (Ubuntu 7.11.1-0ubuntu1~16.5) 7.11.1 Copyright (C) 2016 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-linux-gnu". Type "show configuration" for configuration details. For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>. Find the GDB manual and other documentation resources online at: <http://www.gnu.org/software/gdb/documentation/>. For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from app...done. (gdb) list 1 #include <stdio.h> 2 #include "sort.h" 3 4 void main() 5 { 6 int i; 7 //������������ 8 int array[] = { 12, 5, 33, 6, 10, 35, 67, 89, 87, 65, 54, 24, 58, 92, 100, 24, 46, 78, 99, 200, 55, 44, 33, 22, 11, 71, 2, 4, 86, 8, 9 }; 9 int array2[] = { 12, 5, 33, 6, 10, 35, 67, 89, 87, 65, 54, 24, 58, 92, 100, 24, 46, 78, 99, 200, 55, 44, 33, 22, 11, 71, 2, 4, 86, 8, 9 }; 10 (gdb) l 11 //�������鳤�� 12 int len = sizeof(array) / sizeof(int); 13 //�������� 14 printf("Sort Array:\n"); 15 for (i = 0; i < len; ++i) 16 { 17 printf("%d\t", array[i]); 18 } 19 printf("\n"); 20 (gdb) 21 // selectionSort 22 selectionSort(array, len); 23 // printf 24 printf("Selection Sort:\n"); 25 for (i = 0; i < len; ++i) 26 { 27 printf("%d ", array[i]); 28 } 29 30 // insertionSort (gdb) b 17 Breakpoint 1 at 0x400954: file main.c, line 17. (gdb) b 22 Breakpoint 2 at 0x400993: file main.c, line 22. (gdb) b 27 Breakpoint 3 at 0x4009c0: file main.c, line 27. (gdb) i b Num Type Disp Enb Address What 1 breakpoint keep y 0x0000000000400954 in main at main.c:17 2 breakpoint keep y 0x0000000000400993 in main at main.c:22 3 breakpoint keep y 0x00000000004009c0 in main at main.c:27 (gdb) r Starting program: /home/cdl/Cpp_Tutorials/GDB/app Sort Array: Breakpoint 1, main () at main.c:17 17 printf("%d\t", array[i]); (gdb) p i $1 = 0 (gdb) p array[i] $2 = 12 (gdb) p len $3 = 31 (gdb) ptype i type = int (gdb) ptype array type = int [31] (gdb) n 15 for (i = 0; i < len; ++i) (gdb) Breakpoint 1, main () at main.c:17 17 printf("%d\t", array[i]); (gdb) 15 for (i = 0; i < len; ++i) (gdb) Breakpoint 1, main () at main.c:17 17 printf("%d\t", array[i]); (gdb) 15 for (i = 0; i < len; ++i) (gdb) Breakpoint 1, main () at main.c:17 17 printf("%d\t", array[i]); (gdb) 15 for (i = 0; i < len; ++i) (gdb) Breakpoint 1, main () at main.c:17 17 printf("%d\t", array[i]); (gdb) 15 for (i = 0; i < len; ++i) (gdb) p i $4 = 4 (gdb) n Breakpoint 1, main () at main.c:17 17 printf("%d\t", array[i]); (gdb) 15 for (i = 0; i < len; ++i) (gdb) p i $5 = 5 (gdb) display i 1: i = 5 (gdb) display array[i] 2: array[i] = 35 (gdb) n Breakpoint 1, main () at main.c:17 17 printf("%d\t", array[i]); 1: i = 6 2: array[i] = 67 (gdb) 15 for (i = 0; i < len; ++i) 1: i = 6 2: array[i] = 67 (gdb) Breakpoint 1, main () at main.c:17 17 printf("%d\t", array[i]); 1: i = 7 2: array[i] = 89 (gdb) 15 for (i = 0; i < len; ++i) 1: i = 7 2: array[i] = 89 (gdb) Breakpoint 1, main () at main.c:17 17 printf("%d\t", array[i]); 1: i = 8 2: array[i] = 87 (gdb) 15 for (i = 0; i < len; ++i) 1: i = 8 2: array[i] = 87 (gdb) Breakpoint 1, main () at main.c:17 17 printf("%d\t", array[i]); 1: i = 9 2: array[i] = 65 (gdb) 15 for (i = 0; i < len; ++i) 1: i = 9 2: array[i] = 65 (gdb) Breakpoint 1, main () at main.c:17 17 printf("%d\t", array[i]); 1: i = 10 2: array[i] = 54 (gdb) 15 for (i = 0; i < len; ++i) 1: i = 10 2: array[i] = 54 (gdb) Breakpoint 1, main () at main.c:17 17 printf("%d\t", array[i]); 1: i = 11 2: array[i] = 24 (gdb) 15 for (i = 0; i < len; ++i) 1: i = 11 2: array[i] = 24 (gdb) Breakpoint 1, main () at main.c:17 17 printf("%d\t", array[i]); 1: i = 12 2: array[i] = 58 (gdb) 15 for (i = 0; i < len; ++i) 1: i = 12 2: array[i] = 58 (gdb) i display Auto-display expressions now in effect: Num Enb Expression 1: y i 2: y array[i] (gdb) undisplay 1 (gdb) undisplay 2 (gdb) n Breakpoint 1, main () at main.c:17 17 printf("%d\t", array[i]); (gdb) 15 for (i = 0; i < len; ++i) (gdb) Breakpoint 1, main () at main.c:17 17 printf("%d\t", array[i]); (gdb) p i $6 = 14 (gdb) i b Num Type Disp Enb Address What 1 breakpoint keep y 0x0000000000400954 in main at main.c:17 breakpoint already hit 15 times 2 breakpoint keep y 0x0000000000400993 in main at main.c:22 3 breakpoint keep y 0x00000000004009c0 in main at main.c:27 (gdb) dis 1 (gdb) i b Num Type Disp Enb Address What 1 breakpoint keep n 0x0000000000400954 in main at main.c:17 breakpoint already hit 15 times 2 breakpoint keep y 0x0000000000400993 in main at main.c:22 3 breakpoint keep y 0x00000000004009c0 in main at main.c:27 (gdb) n 15 for (i = 0; i < len; ++i) (gdb) 17 printf("%d\t", array[i]); (gdb) 15 for (i = 0; i < len; ++i) (gdb) c Continuing. 12 5 33 6 10 35 67 89 87 65 54 24 58 92 100 24 46 78 99 200 55 44 33 22 11 71 2 4 86 8 9 Breakpoint 2, main () at main.c:22 22 selectionSort(array, len); (gdb) p i $7 = 31 (gdb) step selectionSort (array=0x7fffffffdbd0, len=31) at select_sort.c:17 17 int min = 0; // ָ����С��Ԫ�ص�λ�� (gdb) l 12 -------------------------------------------------*/ 13 14 //ѡ������(��������) 15 void selectionSort(int *array, int len) 16 { 17 int min = 0; // ָ����С��Ԫ�ص�λ�� 18 // ����ѭ�� 19 for (int i = 0; i < len - 1; ++i) 20 { 21 min = i; (gdb) 22 // �ڴ�ѭ�� 23 for (int j = i + 1; j < len; ++j) 24 { 25 // �ж� 26 if (array[min] > array[j]) 27 { 28 // ������С��Ԫ�ص�λ�� 29 min = j; 30 } 31 } (gdb) 32 // �ж��Ƿ���Ҫ���� 33 if (min != i) 34 { 35 // �ҵ����µ���Сֵ 36 // ���� 37 int tmp = array[min]; 38 array[min] = array[i]; 39 array[i] = tmp; 40 } 41 } (gdb) finish Run till exit from #0 selectionSort (array=0x7fffffffdbd0, len=31) at select_sort.c:17 main () at main.c:24 24 printf("Selection Sort:\n"); (gdb) q A debugging session is active. Inferior 1 [process 5911] will be killed. Quit anyway? (y or n) y cdl@cdl-Inspiron-5421:~/Cpp_Tutorials/GDB$ gdb app GNU gdb (Ubuntu 7.11.1-0ubuntu1~16.5) 7.11.1 Copyright (C) 2016 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-linux-gnu". Type "show configuration" for configuration details. For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>. Find the GDB manual and other documentation resources online at: <http://www.gnu.org/software/gdb/documentation/>. For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from app...done. (gdb) l 1 #include <stdio.h> 2 #include "sort.h" 3 4 void main() 5 { 6 int i; 7 //������������ 8 int array[] = { 12, 5, 33, 6, 10, 35, 67, 89, 87, 65, 54, 24, 58, 92, 100, 24, 46, 78, 99, 200, 55, 44, 33, 22, 11, 71, 2, 4, 86, 8, 9 }; 9 int array2[] = { 12, 5, 33, 6, 10, 35, 67, 89, 87, 65, 54, 24, 58, 92, 100, 24, 46, 78, 99, 200, 55, 44, 33, 22, 11, 71, 2, 4, 86, 8, 9 }; 10 (gdb) 11 //�������鳤�� 12 int len = sizeof(array) / sizeof(int); 13 //�������� 14 printf("Sort Array:\n"); 15 for (i = 0; i < len; ++i) 16 { 17 printf("%d\t", array[i]); 18 } 19 printf("\n"); 20 (gdb) 21 // selectionSort 22 selectionSort(array, len); 23 // printf 24 printf("Selection Sort:\n"); 25 for (i = 0; i < len; ++i) 26 { 27 printf("%d ", array[i]); 28 } 29 30 // insertionSort (gdb) b 17 Breakpoint 1 at 0x400954: file main.c, line 17. (gdb) r Starting program: /home/cdl/Cpp_Tutorials/GDB/app Sort Array: Breakpoint 1, main () at main.c:17 17 printf("%d\t", array[i]); (gdb) start The program being debugged has been started already. Start it from the beginning? (y or n) y Temporary breakpoint 2 at 0x40070a: file main.c, line 5. Starting program: /home/cdl/Cpp_Tutorials/GDB/app Temporary breakpoint 2, main () at main.c:5 5 { (gdb) c Continuing. Sort Array: Breakpoint 1, main () at main.c:17 17 printf("%d\t", array[i]); (gdb) p i $1 = 0 (gdb) p array[i] $2 = 12 (gdb) set var i=5 (gdb) p i $3 = 5 (gdb) p array[i] $4 = 35 (gdb) until 15 for (i = 0; i < len; ++i) (gdb) Breakpoint 1, main () at main.c:17 17 printf("%d\t", array[i]); (gdb) 15 for (i = 0; i < len; ++i) (gdb) Breakpoint 1, main () at main.c:17 17 printf("%d\t", array[i]); (gdb) 15 for (i = 0; i < len; ++i) (gdb) p i $5 = 7 (gdb) i b Num Type Disp Enb Address What 1 breakpoint keep y 0x0000000000400954 in main at main.c:17 breakpoint already hit 3 times (gdb) d 1 (gdb) display i 1: i = 7 (gdb) until 19 printf("\n"); 1: i = 31 (gdb) 35 67 89 87 65 54 24 58 92 100 24 46 78 99 200 55 44 33 22 11 71 2 4 86 8 9 22 selectionSort(array, len); 1: i = 31 (gdb) q A debugging session is active. Inferior 1 [process 6938] will be killed. Quit anyway? (y or n) y
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