The variablefoomust exist somewhere but how do I find its value or where it is stored? I found a page which explains in detail how the DWARF debug information works for optimized codehttps://undo.io/resources/gdb-watchpoint/build-for-debug-in-gdb. Using the suggestions there ...
set environment varname [=value] 設置環境變量。如:set env USER=hchen show environment [varname] 查看環境變量。 3、工作目錄。 cd 相當於shell的cd命令。 pwd 顯示當前的所在目錄。 4、程序的輸入輸出。 info terminal 顯示你程序用到的終端的模式。 使用重定向控制程序輸出。如:run > outfile tty命令...
(gdb) print variable_name (gdb) whatis x # 显示x的类型 (gdb) set variable xx=5 # 修改变量的值 pretty显示 (gdb) set print pretty on # 命令可以让 GDB 以更可读的方式打印复杂数据结构,如类对象、结构体等。 (gdb) set print object on # 命令可以以更可读的方式打印对象的信息。
The debugger is supposed to find this function's address by examining the r_brk member of struct r_debug, but GDB 4.15 in fact looks for this particular symbol name in the PT_INTERP file. */ void _dl_debug_state (void) { } rtld_hidden_def (_dl_debug_state) 这个空函数就是 gdb 和...
find -- Search memoryfora sequence of bytes init-if-undefined -- Initialize a convenience variableifnecessary mem -- Define attributesformemory region or reset memory region handling to output -- Like"print"but don't put in value history and don'tprintnewlineprint-- Print value of expression...
(gdb) print find_entry(1,0) l 数据结构和其他复杂对象 (gdb) print *table_start $8={e=reference=’/000’,location=0x0,next=0x0} l 值的历史成分 (gdb)print $1 ($1为历史记录变量,在以后可以直接引用 $1 的值) l 人为数组 人为数组提供了一种去显示存储器块(数组节或动态分配的存储区)内...
set variable varname = value varname是变量名称,value是变量的新值。 (1)修改变量值: a.printv=value: 修改变量值的同时,把修改后的值显示出来 b.set[var]v=value: 修改变量值,需要注意如果变量名与GDB中某个set命令中的关键字一样的话,前面加上var关键字 ...
set environment varname [=value] 设置环境变量。如:set env USER=hchen show environment [varname] 查看环境变量。 3、工作目录。 cd 相当于shell的cd命令。 pwd 显示当前的所在目录。 4、程序的输入输出。 info terminal 显示你程序用到的终端的模式。
One of the best ways to find the location of a variable in memory, when you don't have the target program's source code, is to scan the process's memory for its current value and note all addresses that contain that value. Then, do something to make the value change, and check...
explore type--Explore a type or the typeofan expression validinthe current explore value--Explore valueofan expression validinthe current context find--Search memoryfora sequenceofbytes init-if-undefined--Initialize a convenience variableifnecessary ...