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"""Python implementation of Programs/_freeze_module.c

The pure Python implementation uses same functions and arguments as the C

implementation.

The generated byte code is slightly different because

compile() sets the PyCF_SOURCE_IS_UTF8 flag and objects have a

reference count > 1. Marshal adds the `FLAG_REF` flag and creates a

reference `hashtable`.

"""

import marshal

import sys

header = "/* Auto-generated by Programs/_freeze_module.py */"

def read_text(inpath: str) -> bytes:

with open(inpath, "rb") as f:

return f.read()

def compile_and_marshal(name: str, text: bytes) -> bytes:

filename = f"<frozen {name}>"

# exec == Py_file_input

code = compile(text, filename, "exec", optimize=0, dont_inherit=True)

return marshal.dumps(code)

def get_varname(name: str, prefix: str) -> str:

return f"{prefix}{name.replace('.', '_')}"

def write_code(outfile, marshalled: bytes, varname: str) -> None:

data_size = len(marshalled)

outfile.write(f"const unsigned char {varname}[] = {{\n")

for n in range(0, data_size, 16):

outfile.write(" ")

outfile.write(",".join(str(i) for i in marshalled[n : n + 16]))

outfile.write(",\n")

outfile.write("};\n")

def write_frozen(outpath: str, inpath: str, name: str, marshalled: bytes) -> None:

with open(outpath, "w") as outfile:

outfile.write(header)

outfile.write("\n")

arrayname = get_varname(name, "_Py_M__")

write_code(outfile, marshalled, arrayname)

def main():

if len(sys.argv) != 4:

sys.exit("need to specify the name, input and output paths\n")

name = sys.argv[1]

inpath = sys.argv[2]

outpath = sys.argv[3]

text = read_text(inpath)

marshalled = compile_and_marshal(name, text)

write_frozen(outpath, inpath, name, marshalled)

if __name__ == "__main__":

main()

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