Hello, I am trying to fix an open issue on emscripten, but to do this first 
I need to understand how free and fflush are generated and works. 

I already compiled the buggy code with -s WASM=0, so that all the code is 
in the JS file, the problem is that _free and _fflush functions are 
unreadable, it is full of non-sense variable names (I know it makes sense 
to be this way).

How can I understand how this functions are implemented, how they manage FS 
system in the JS and how they free the memory in JS, I mean the memory that 
emscripten simulates.

I know that this may be a ridiculous question, but I just could not found a 
material that could help me. A documentation explaining what is each part 
of the project and how the overall emscripten works "in depth" would be 
nice.

Thanks in advance.

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