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Python extension to run WebAssembly binaries

Project description

Wasmer logo Wasmer Python, the Singlepass compiler PyPI version Wasmer Python Documentation Wasmer PyPI downloads Wasmer Slack Channel

wasmer is a complete and mature WebAssembly runtime for Python. wasmer_compiler_singlepass provides the Singlepass compiler to wasmer, so that wasmer is able to compile WebAssembly module.

Other compilers exist:

  • wasmer_compiler_cranelift,
  • wasmer_compiler_llvm.

To get a more complete view, please see the documentation of the wasmer package itself.


This package must be used with the wasmer package, thus:

$ pip install wasmer
$ pip install wasmer_compiler_singlepass


Any engines in wasmer.engine can take the wasmer_compiler_singlepass.Compiler class as argument:

from wasmer import engine, Store, Module, Instance
from wasmer_compiler_singlepass import Compiler

# Let's use the Singlepass compiler with the JIT engine…
store = Store(engine.JIT(Compiler))

# … or with the native engine!
store = Store(engine.Native(Compiler))

# And now, compile the module.
module = Module(store, open('my_program.wasm', 'rb').read())

# Now it's compiled, let's instantiate it.
instance = Instance(module)

# And get fun, for example by calling the `sum` exported function!
print(instance.exports.sum(1, 2))


Browse the documentation at

Alternatively, run just build compiler-singlepass followed by just doc to generate the documentation inside docs/api/wasmer_compiler_singlepass.html.

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