Supporting jemalloc memory allocator

[jetchirag]

Opening this issue to discuss and keep track of development for jemalloc support in pwndbg. This project is a part of my GSoC 24 proposal.

Original Details of the project: #2014 (comment)

Currently I am working on the first PR to print basic extent info, got delayed due to a health issue. Will post my current dev environment in case anyone wants to catch up along with all the resources I found useful.

[jetchirag]

I'm using vscode remote development on a VPS.

• pwndbg
• jemalloc (5.3.0)

run.sh

cd "$(dirname "$0")"

filename=test

rm -f $filename
gcc -g -O0 $filename.cpp -o $filename `jemalloc-config --libdir`/libjemalloc.a `jemalloc-config --libs`

#  if argument y is passed if n then run simple else nothing
if [ "$1" == "y" ]; then
    gdb -ex run --args $filename
elif [ "$1" == "n" ]; then
    ./$filename
fi

Sample test file:

#include <stdlib.h>
#include <iostream>
#include <jemalloc/jemalloc.h>

void breakhere(){}

int main(void)
{

    char *block;
    for(int i=0; i<(4096/8); i++){
        block = (char *)malloc(8);
        for (int i = 0; i < 8; i++){
            block[i] = 'A' + (i % 26);
        }
        // breakhere();
    }

    breakhere();

    return 0;
}

[CptGibbon]

Looks like you're off to a great start 👍
Don't sweat the small delay, we're technically still in the community bonding period.
If you open a draft PR with your basic setup (jemalloc installed via setup-dev.sh, test binary etc.) I can clone that so we're on the same page.