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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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