我正在按照以下步骤定位当前的 PHP 函数调用，如下所示：

1. 运行虚拟脚本：

   $ gdb -ex run --args php -r "sleep(10);"
   

2. 按下Ctrl+C返回gdb运行：

   (gdb) bt full
   #1  0x00007ffff6007dd4 in __sleep (seconds=0) at ../sysdeps/unix/sysv/linux/sleep.c:137
           ts = {tv_sec = 8, tv_nsec = 306649388}
           set = {__val = {65536, 0 <repeats 15 times>}}
           oset = {__val = {0, 4469319, 4294967295, 8081486, 140737319884960, 140737354070488, 15761488, 15454080, 15337134, 
               140737354001040, 0, 7307048, 16048064, 206158430232, 140737488342304, 140737488342096}}
           result = <optimized out>
   #2  0x00000000006156ef in zif_sleep ()
   No symbol table info available.
   #3  0x00000000006ddd7b in dtrace_execute_internal ()
   No symbol table info available.
   #4  0x000000000079dde5 in ?? ()
   No symbol table info available.
   #5  0x0000000000717b18 in execute_ex ()
   No symbol table info available.
   #6  0x00000000006ddc79 in dtrace_execute_ex ()
   No symbol table info available.
   #7  0x00000000006e1b0a in zend_eval_stringl ()
   No symbol table info available.
   #8  0x00000000006e1bf9 in zend_eval_stringl_ex ()
   ...
   (gdb) frame 2
   #2  0x00000000006156ef in zif_sleep ()
   (gdb) print (char *)(executor_globals.function_state_ptr->function)->common.function_name
   Attempt to extract a component of a value that is not a structure.      
   (gdb) print (char *)(executor_globals.function_state_ptr->function)
   Attempt to extract a component of a value that is not a structure.
   (gdb) print (char *)(executor_globals)
   $2 = 0xffffffffffffcf48 <error: Cannot access memory at address 0xffffffffffffcf48>
   

   所以似乎executor_globals符号不可用。是因为二进制文件已经优化了，我在错误的框架中还是别的什么？或者我应该lldb改用？