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                # 顯示將要執行的匯編指令 ## 例子 #include <stdio.h> int global_var; void change_var(){ global_var=100; } int main(void){ change_var(); return 0; } ## 技巧 使用gdb調試匯編程序時,可以用“`display /i $pc`”命令顯示當程序停止時,將要執行的匯編指令。以上面程序為例: (gdb) start Temporary breakpoint 1 at 0x400488: file a.c, line 9. Starting program: /data2/home/nanxiao/a Temporary breakpoint 1, main () at a.c:9 9 change_var(); (gdb) display /i $pc 1: x/i $pc => 0x400488 <main+4>: mov $0x0,%eax (gdb) si 0x000000000040048d 9 change_var(); 1: x/i $pc => 0x40048d <main+9>: callq 0x400474 <change_var> (gdb) change_var () at a.c:4 4 void change_var(){ 1: x/i $pc => 0x400474 <change_var>: push %rbp 可以看到打印出了將要執行的匯編指令。此外也可以一次顯示多條指令: (gdb) display /3i $pc 2: x/3i $pc => 0x400474 <change_var>: push %rbp 0x400475 <change_var+1>: mov %rsp,%rbp 0x400478 <change_var+4>: movl $0x64,0x2003de(%rip) # 0x600860 <global_var> 可以看到一次顯示了`3`條指令。 取消顯示可以用`undisplay`命令。 詳情參見[gdb手冊](https://sourceware.org/gdb/onlinedocs/gdb/Auto-Display.html) ## 貢獻者 nanxiao
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