I understand that assembly file can be parsed in the same way. However, I want to learn about the machine instructions to the level of bits, and likewise the layouts of binary files. Unless I am able to go all the way to machine code loaded in memory, I would not know where in memory to add a breakpoint instruction when a developer wants the same on a line of code.

If there is some library that can help create machine code from assembly instructions on a line by line basis (at least as opposed to invoking a separate program that generates the entire binary collectively from the assembly code), that could also work.

In my case, I already know enough of the lexer, parser, etc., parts. What's missing is going all the way to making a debugger, profiler, etc.