176 lines
5 KiB
Python
176 lines
5 KiB
Python
#! /usr/bin/env python3
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"""Generate coroutine wrappers for block subsystem.
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The program parses one or several concatenated c files from stdin,
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searches for functions with the 'generated_co_wrapper' specifier
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and generates corresponding wrappers on stdout.
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Usage: block-coroutine-wrapper.py generated-file.c FILE.[ch]...
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Copyright (c) 2020 Virtuozzo International GmbH.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""
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import sys
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import re
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from typing import Iterator
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def gen_header():
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copyright = re.sub('^.*Copyright', 'Copyright', __doc__, flags=re.DOTALL)
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copyright = re.sub('^(?=.)', ' * ', copyright.strip(), flags=re.MULTILINE)
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copyright = re.sub('^$', ' *', copyright, flags=re.MULTILINE)
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return f"""\
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/*
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* File is generated by scripts/block-coroutine-wrapper.py
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*
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{copyright}
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*/
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#include "qemu/osdep.h"
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#include "block/coroutines.h"
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#include "block/block-gen.h"
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#include "block/block_int.h"\
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"""
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class ParamDecl:
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param_re = re.compile(r'(?P<decl>'
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r'(?P<type>.*[ *])'
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r'(?P<name>[a-z][a-z0-9_]*)'
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r')')
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def __init__(self, param_decl: str) -> None:
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m = self.param_re.match(param_decl.strip())
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if m is None:
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raise ValueError(f'Wrong parameter declaration: "{param_decl}"')
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self.decl = m.group('decl')
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self.type = m.group('type')
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self.name = m.group('name')
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class FuncDecl:
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def __init__(self, return_type: str, name: str, args: str) -> None:
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self.return_type = return_type.strip()
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self.name = name.strip()
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self.args = [ParamDecl(arg.strip()) for arg in args.split(',')]
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def gen_list(self, format: str) -> str:
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return ', '.join(format.format_map(arg.__dict__) for arg in self.args)
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def gen_block(self, format: str) -> str:
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return '\n'.join(format.format_map(arg.__dict__) for arg in self.args)
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# Match wrappers declared with a generated_co_wrapper mark
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func_decl_re = re.compile(r'^int\s*generated_co_wrapper\s*'
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r'(?P<wrapper_name>[a-z][a-z0-9_]*)'
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r'\((?P<args>[^)]*)\);$', re.MULTILINE)
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def func_decl_iter(text: str) -> Iterator:
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for m in func_decl_re.finditer(text):
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yield FuncDecl(return_type='int',
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name=m.group('wrapper_name'),
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args=m.group('args'))
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def snake_to_camel(func_name: str) -> str:
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"""
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Convert underscore names like 'some_function_name' to camel-case like
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'SomeFunctionName'
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"""
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words = func_name.split('_')
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words = [w[0].upper() + w[1:] for w in words]
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return ''.join(words)
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def gen_wrapper(func: FuncDecl) -> str:
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assert not '_co_' in func.name
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assert func.return_type == 'int'
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assert func.args[0].type in ['BlockDriverState *', 'BdrvChild *',
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'BlockBackend *']
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subsystem, subname = func.name.split('_', 1)
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name = f'{subsystem}_co_{subname}'
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t = func.args[0].type
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if t == 'BlockDriverState *':
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bs = 'bs'
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elif t == 'BdrvChild *':
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bs = 'child->bs'
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else:
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bs = 'blk_bs(blk)'
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struct_name = snake_to_camel(name)
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return f"""\
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/*
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* Wrappers for {name}
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*/
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typedef struct {struct_name} {{
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BdrvPollCo poll_state;
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{ func.gen_block(' {decl};') }
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}} {struct_name};
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static void coroutine_fn {name}_entry(void *opaque)
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{{
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{struct_name} *s = opaque;
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s->poll_state.ret = {name}({ func.gen_list('s->{name}') });
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s->poll_state.in_progress = false;
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aio_wait_kick();
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}}
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int {func.name}({ func.gen_list('{decl}') })
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{{
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if (qemu_in_coroutine()) {{
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return {name}({ func.gen_list('{name}') });
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}} else {{
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{struct_name} s = {{
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.poll_state.bs = {bs},
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.poll_state.in_progress = true,
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{ func.gen_block(' .{name} = {name},') }
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}};
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s.poll_state.co = qemu_coroutine_create({name}_entry, &s);
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return bdrv_poll_co(&s.poll_state);
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}}
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}}"""
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def gen_wrappers(input_code: str) -> str:
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res = ''
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for func in func_decl_iter(input_code):
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res += '\n\n\n'
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res += gen_wrapper(func)
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return res
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if __name__ == '__main__':
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if len(sys.argv) < 3:
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exit(f'Usage: {sys.argv[0]} OUT_FILE.c IN_FILE.[ch]...')
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with open(sys.argv[1], 'w', encoding='utf-8') as f_out:
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f_out.write(gen_header())
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for fname in sys.argv[2:]:
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with open(fname, encoding='utf-8') as f_in:
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f_out.write(gen_wrappers(f_in.read()))
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f_out.write('\n')
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