gdb 调试工具

#c程序
gcc gdb-sample.c -o gdb-sample -g
#c++程序
g++ gdb-sample.cpp -o gdb-sample -g

gdb
file gdb-sample #加载程序文件

file 源文件名

r

c

b 行号|函数名|*代码地址

d 断点标号

s

n

p <变量名称>

i

q

help [命令名称]

#include <stdio.h>

int nGlobalVar = 0;

int tempFunction(int a, int b)
{
    printf("tempFunction is called, a = %d, b = %d /n", a, b);
    return (a + b);
}

int main()
{
    int n;
    n = 1;
    n++;
    n--;

    nGlobalVar += 100;
    nGlobalVar -= 12;

    printf("n = %d, nGlobalVar = %d /n", n, nGlobalVar);

    n = tempFunction(1, 2);
    printf("n = %d", n);

    return 0;
}

gcc gdb-sample.c -o gdb-sample -g
gdb
file gdb-sample
r
b main
r
s
p n
b 26
c
p nGlobalVar
c
p a
p b
c
display /i $pc
r
si
si
d
b *main
r
i r
i r eax
q