python/tvm/contrib/emcc.py

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"""Util to invoke emscripten compilers in the system."""
# pylint: disable=invalid-name
import subprocess
from tvm._ffi.base import py_str
from tvm._ffi.libinfo import find_lib_path


def create_tvmjs_wasm(output, objects, options=None, cc="emcc"):
    """Create wasm that is supposed to run with the tvmjs.

    Parameters
    ----------
    output : str
        The target shared library.

    objects : list
        List of object files.

    options : str
        The additional options.

    cc : str, optional
        The compile string.
    """
    cmd = [cc]
    cmd += ["-O3"]

    cmd += ["-std=c++14"]
    cmd += ["-s", "ERROR_ON_UNDEFINED_SYMBOLS=0"]
    cmd += ["-s", "STANDALONE_WASM=1"]
    cmd += ["-s", "ALLOW_MEMORY_GROWTH=1"]

    objects = [objects] if isinstance(objects, str) else objects

    with_runtime = False
    for obj in objects:
        if obj.find("wasm_runtime.bc") != -1:
            with_runtime = True

    if not with_runtime:
        objects += [find_lib_path("wasm_runtime.bc")[0]]

    objects += [find_lib_path("tvmjs_support.bc")[0]]
    objects += [find_lib_path("webgpu_runtime.bc")[0]]

    cmd += ["-o", output]
    cmd += objects

    if options:
        cmd += options

    proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
    (out, _) = proc.communicate()

    if proc.returncode != 0:
        msg = "Compilation error:\n"
        msg += py_str(out)
        raise RuntimeError(msg)


create_tvmjs_wasm.object_format = "bc"