How compile function written in python to JavaScript (emscripten)?

Question

I have a simple function written in python which I want to port to javascript.

I have compiled python 2.7 into a .so library, so thats not the issue.

The problem I'm having is that after I compile my program with cython, the function names get all scrambled up, which means I don't know how to preserve the functions when i run emcc.

Does anybody have any experience compiling python programs to js with emscripten?

Any information would be appreciated.

Note: I want to preserve the exact functionality to that of python, I don't want something that translates a python program into javascript.

There are more direct ways of turning Python into JavaScript, which may be more appropriate for your situation. The projects listed in the Python section here: altjs.org/#ports and here: github.com/jashkenas/coffee-script/wiki/… may all be viable options for you. — Vitorio
– Vitorio, Commented Nov 7, 2013 at 4:20
You may also find this project interesting: github.com/replit/jsrepl. It's a multi-language scripting engine in javascript that you can run in a browser. Supports Python (which I think was ported to it using emscripten). So instead of compiling Python to js you can just send Python to the browser. — slebetman
– slebetman, Commented Nov 7, 2013 at 4:49
Given the SO question I found and posted below, I think @slebetman is right, that doing the sort of thing that jsrepl does to run arbitrary Python code against its emscripten-compiled CPython interpreter is going to be your best bet if you want to preserve the original Python code. github.com/replit/empythoned is their Python-specific example. — Vitorio
– Vitorio, Commented Nov 11, 2013 at 8:51
You can also run Python scripts in JavaScript using Skulpt: skulpt.org — Anderson Green
– Anderson Green, Commented Jan 12, 2014 at 18:09

Community · Accepted Answer · 2017-05-23 12:33:14Z

6

+150

This other question, with an accepted answer, complains about the same issue: Cython mangling function names and making it difficult to access from C++: Embed python function in C++

The accepted answer states that Cython isn't meant for this sort of thing at all, suggesting you can't do what you want in this fashion:

You're not going to be able to get the interoperation you want that way. If you open and inspect hello.c you won't find "static int say_hello" anywhere in there. Cython is designed for letting Python use C libraries, not letting C libraries use python.

The not-accepted next answer suggest that specifying public will not mangle the function name, although he also mentions linking problems.

# (in the generated C file hello.c)
__PYX_EXTERN_C DL_IMPORT(...) say_hello(...);

Worth a shot, but please consider the other options in the comments if it fails.

edited May 23, 2017 at 12:33

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answered Nov 7, 2013 at 4:13

Vitorio

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1 Comment

Firas Dib Over a year ago

Right, but my function names after going through cython get scrambled up, to "my_func" is called "<bunch of weird stuff>_my_func" now.

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