blob: 08be813407b636aec129bae27ec25b0436cda0ec [file] [log] [blame]
#! /usr/bin/env python3
"""Generate coroutine wrappers for block subsystem.
The program parses one or several concatenated c files from stdin,
searches for functions with the 'generated_co_wrapper' specifier
and generates corresponding wrappers on stdout.
Usage: generated-file.c FILE.[ch]...
Copyright (c) 2020 Virtuozzo International GmbH.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <>.
import sys
import re
from typing import Iterator
def gen_header():
copyright = re.sub('^.*Copyright', 'Copyright', __doc__, flags=re.DOTALL)
copyright = re.sub('^(?=.)', ' * ', copyright.strip(), flags=re.MULTILINE)
copyright = re.sub('^$', ' *', copyright, flags=re.MULTILINE)
return f"""\
* File is generated by scripts/
#include "qemu/osdep.h"
#include "block/coroutines.h"
#include "block/block-gen.h"
#include "block/block_int.h"\
class ParamDecl:
param_re = re.compile(r'(?P<decl>'
r'(?P<type>.*[ *])'
def __init__(self, param_decl: str) -> None:
m = self.param_re.match(param_decl.strip())
if m is None:
raise ValueError(f'Wrong parameter declaration: "{param_decl}"')
self.decl ='decl')
self.type ='type') ='name')
class FuncDecl:
def __init__(self, return_type: str, name: str, args: str) -> None:
self.return_type = return_type.strip() = name.strip()
self.args = [ParamDecl(arg.strip()) for arg in args.split(',')]
def gen_list(self, format: str) -> str:
return ', '.join(format.format_map(arg.__dict__) for arg in self.args)
def gen_block(self, format: str) -> str:
return '\n'.join(format.format_map(arg.__dict__) for arg in self.args)
# Match wrappers declared with a generated_co_wrapper mark
func_decl_re = re.compile(r'^int\s*generated_co_wrapper\s*'
r'\((?P<args>[^)]*)\);$', re.MULTILINE)
def func_decl_iter(text: str) -> Iterator:
for m in func_decl_re.finditer(text):
yield FuncDecl(return_type='int','wrapper_name'),'args'))
def snake_to_camel(func_name: str) -> str:
Convert underscore names like 'some_function_name' to camel-case like
words = func_name.split('_')
words = [w[0].upper() + w[1:] for w in words]
return ''.join(words)
def gen_wrapper(func: FuncDecl) -> str:
assert not '_co_' in
assert func.return_type == 'int'
assert func.args[0].type in ['BlockDriverState *', 'BdrvChild *',
'BlockBackend *']
subsystem, subname ='_', 1)
name = f'{subsystem}_co_{subname}'
t = func.args[0].type
if t == 'BlockDriverState *':
bs = 'bs'
elif t == 'BdrvChild *':
bs = 'child->bs'
bs = 'blk_bs(blk)'
struct_name = snake_to_camel(name)
return f"""\
* Wrappers for {name}
typedef struct {struct_name} {{
BdrvPollCo poll_state;
{ func.gen_block(' {decl};') }
}} {struct_name};
static void coroutine_fn {name}_entry(void *opaque)
{struct_name} *s = opaque;
s->poll_state.ret = {name}({ func.gen_list('s->{name}') });
s->poll_state.in_progress = false;
int {}({ func.gen_list('{decl}') })
if (qemu_in_coroutine()) {{
return {name}({ func.gen_list('{name}') });
}} else {{
{struct_name} s = {{ = {bs},
.poll_state.in_progress = true,
{ func.gen_block(' .{name} = {name},') }
}}; = qemu_coroutine_create({name}_entry, &s);
return bdrv_poll_co(&s.poll_state);
def gen_wrappers(input_code: str) -> str:
res = ''
for func in func_decl_iter(input_code):
res += '\n\n\n'
res += gen_wrapper(func)
return res
if __name__ == '__main__':
if len(sys.argv) < 3:
exit(f'Usage: {sys.argv[0]} OUT_FILE.c IN_FILE.[ch]...')
with open(sys.argv[1], 'w', encoding='utf-8') as f_out:
for fname in sys.argv[2:]:
with open(fname, encoding='utf-8') as f_in: