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Description
Is your feature request related to a problem? Please describe. Essentially I don't want to type two extra characters.
We currently define some convenience functions, and adding more would be great, like mentioned in https://github.com/pwndbg/pwndbg/issues/2849 . It can probably be implemented such that p/x $heap(offset) returns a rebased value and p/x $heap() returns just the base of the heap. However, there should be no need to type ().
Describe the solution you'd like
Gdb provides a facility called convinience variables: https://sourceware.org/gdb/current/onlinedocs/gdb.html/Convenience-Vars.html
For python api see https://sourceware.org/gdb/current/onlinedocs/gdb.html/Basic-Python.html and search gdb.convenience_variable and gdb.set_convenience_variable.
Additional context
A user can define such a variable with set $awa = 0x1337 syntax, but even so I believe the variable names we define shouldn't have a preceding _, for example the variable for getting the base of the heap should be $heap and not $_heap because the risk of collision is really low in reality, and the _ is annoying to type.