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一. 打印函数堆栈帧信息
在 gdb 调试中，查看函数调用栈信息操作指令有几种，其中，常用的指令有
bt (backtrace 缩写)指令，
i frame(info frame)指令(查看函数的堆栈帧信息更加详细)，
frame n 命令(其中 n 为堆栈帧的层次)。
1. bt 命令 与 info frame命令的区别
bt 命令：查看函数调用的顺序，即当前函数向上的所有函数调用栈信息。经过笔者验证，还有 where 命令/ info stack 命令，与 bt
命令相同的功能。
info frame 命令：与 bt 命令不同，i frame 命令查看当前函数调用的栈帧信息。而不是所有函数调用堆栈信息。
下来使用如下代码，操作如何查看所有函数调用栈信息，与当前函数的堆栈信息。代码如下：
#include <stdio.h> int fun(int a, int b) { int c = 0; c = a + b;
printf("***fun(): c: %d\n", c); return c; } int main(void) { int data1 = 1; int
data2 = 2; int data3 = 0; data3 = fun(data1, data2); printf("***main(): data3:
%d\n", data3); return 0; }
调试带调试信息的程序（-g 编译），输入 b main.c:fun:7 在 fun() 函数内部一行打断点，输入 run
命令运行。程序此时会停在断点处。这时，可查看所有函数调用顺序(即函数调用栈帧信息) 与 当前的函数fun() 的堆栈信息。操作如下：
可以看到执行 i frame 命令后，输出了当前函数 fun() 堆栈帧的地址，指令寄存器的值，局部变量地址及值等信息。
输入 i registers 命令，可以对照当前寄存器的值和函数的汇编指令看一下。
输入 disassemble fun 命令，可以查看函数汇编指令。如下所示：
