Added test locals printing command to GDB

[khlevin]

Added experimental locals printing command to GDB. Command "print-test [recursion-depth]" currently prints a dictionary of found local variables mapped to memory locations, and JSON list of these variables, with fields "name", "type", "value"

[nicovank]

Delete test/a.out, maybe run black formatter, and LGTM!

Tested with file:

#include <iostream>

struct P {
    int b;
};

struct Q {
    int a;
    P* p;
    P q;
};

struct C {
    C* c;
};

int main() {
    Q q;
    q.a = 1;
    q.p = new P();
    q.p->b = 2;
    q.q.b = 3;

    int i = 0;

    C a;
    C b;
    a.c = &b;
    b.c = &a;

    std::cout << *static_cast<char*>(nullptr) << std::endl;
}

PS: Instead of a max-recursion parameter, maybe we could keep a list of already printed/visited variable within a certain scope, and just stop when visiting again?

[nicovank]

Seems like arg contains the entire string after the command, we should be able to parse options this way. (I like argparse personally).

We could use this to add timeout, llm, and other options, provided LLDB has similar functionality.

[nicovank]

Suggested change

variable = {} # Create python dictionary for each variable