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I am using gdb and I was wanting to print a variable not currently in the scope. I am not sure what the exact name of the variable is so I would like to be able to change scopes rather than printing a specific variable in a specific file.
655
The @entry form refers to the value of the parameter when the function was entered. This isn't always available, but sometimes it is -- there is a DWARF extension for it, and GCC emits this when possible. There's some information here: https://sourceware.org/gdb/onlinedocs/gdb/Variables.html.
The usual way to examine data in your program is with the print command (abbreviated p ), or its synonym inspect . It evaluates and prints the value of an expression of the language your program is written in (see section Using GDB with Different Languages).
You can create variables in the context of gdb for your convenience, like set $foo = ... and later reference $foo . Obviously such variables are in no way visible to the running code, however. it's not only for inspection. you can change variable values in gdb: stackoverflow.com/questions/3305164/….
Enables automatic displaying of certain expressions each time GDB stops at a breakpoint or after a step.
You can use the frame, up and down commands to access scopes on the stack.
frame N
f N
Select frame number N. (The current instruction is in frame 0.)
up [N]
Move N frames up the stack (away from frame 0).
down [N]
Move N frames down the stack (towards frame 0).
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