#!/usr/bin/env python3
# ex: set filetype=python:
"""Translate an XDR specification into executable code that
can be compiled for the Linux kernel."""
import logging
from argparse import Namespace
from lark import logger
from lark.exceptions import UnexpectedInput
from generators.source_top import XdrSourceTopGenerator
from generators.enum import XdrEnumGenerator
from generators.pointer import XdrPointerGenerator
from generators.program import XdrProgramGenerator
from generators.typedef import XdrTypedefGenerator
from generators.struct import XdrStructGenerator
from generators.union import XdrUnionGenerator
from xdr_ast import transform_parse_tree, _RpcProgram, Specification
from xdr_ast import _XdrAst, _XdrEnum, _XdrPointer
from xdr_ast import _XdrStruct, _XdrTypedef, _XdrUnion
from xdr_parse import xdr_parser, set_xdr_annotate
logger.setLevel(logging.INFO)
def emit_source_decoder(node: _XdrAst, language: str, peer: str) -> None:
"""Emit one XDR decoder function for a source file"""
if isinstance(node, _XdrEnum):
gen = XdrEnumGenerator(language, peer)
elif isinstance(node, _XdrPointer):
gen = XdrPointerGenerator(language, peer)
elif isinstance(node, _XdrTypedef):
gen = XdrTypedefGenerator(language, peer)
elif isinstance(node, _XdrStruct):
gen = XdrStructGenerator(language, peer)
elif isinstance(node, _XdrUnion):
gen = XdrUnionGenerator(language, peer)
elif isinstance(node, _RpcProgram):
gen = XdrProgramGenerator(language, peer)
else:
return
gen.emit_decoder(node)
def emit_source_encoder(node: _XdrAst, language: str, peer: str) -> None:
"""Emit one XDR encoder function for a source file"""
if isinstance(node, _XdrEnum):
gen = XdrEnumGenerator(language, peer)
elif isinstance(node, _XdrPointer):
gen = XdrPointerGenerator(language, peer)
elif isinstance(node, _XdrTypedef):
gen = XdrTypedefGenerator(language, peer)
elif isinstance(node, _XdrStruct):
gen = XdrStructGenerator(language, peer)
elif isinstance(node, _XdrUnion):
gen = XdrUnionGenerator(language, peer)
elif isinstance(node, _RpcProgram):
gen = XdrProgramGenerator(language, peer)
else:
return
gen.emit_encoder(node)
def generate_server_source(filename: str, root: Specification, language: str) -> None:
"""Generate server-side source code"""
gen = XdrSourceTopGenerator(language, "server")
gen.emit_source(filename, root)
for definition in root.definitions:
emit_source_decoder(definition.value, language, "server")
for definition in root.definitions:
emit_source_encoder(definition.value, language, "server")
def generate_client_source(filename: str, root: Specification, language: str) -> None:
"""Generate server-side source code"""
gen = XdrSourceTopGenerator(language, "client")
gen.emit_source(filename, root)
# cel: todo: client needs XDR size macros
for definition in root.definitions:
emit_source_encoder(definition.value, language, "client")
for definition in root.definitions:
emit_source_decoder(definition.value, language, "client")
# cel: todo: client needs PROC macros
def handle_parse_error(e: UnexpectedInput) -> bool:
"""Simple parse error reporting, no recovery attempted"""
print(e)
return True
def subcmd(args: Namespace) -> int:
"""Generate encoder and decoder functions"""
set_xdr_annotate(args.annotate)
parser = xdr_parser()
with open(args.filename, encoding="utf-8") as f:
parse_tree = parser.parse(f.read(), on_error=handle_parse_error)
ast = transform_parse_tree(parse_tree)
match args.peer:
case "server":
generate_server_source(args.filename, ast, args.language)
case "client":
generate_client_source(args.filename, ast, args.language)
case _:
print("Code generation for", args.peer, "is not yet supported")
return 0
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