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Diffstat (limited to 'scripts/qapi/gen.py')
| -rw-r--r-- | scripts/qapi/gen.py | 291 |
1 files changed, 291 insertions, 0 deletions
diff --git a/scripts/qapi/gen.py b/scripts/qapi/gen.py new file mode 100644 index 0000000000..112b6d94c5 --- /dev/null +++ b/scripts/qapi/gen.py @@ -0,0 +1,291 @@ +# -*- coding: utf-8 -*- +# +# QAPI code generation +# +# Copyright (c) 2018-2019 Red Hat Inc. +# +# Authors: +# Markus Armbruster <armbru@redhat.com> +# Marc-André Lureau <marcandre.lureau@redhat.com> +# +# This work is licensed under the terms of the GNU GPL, version 2. +# See the COPYING file in the top-level directory. + + +import errno +import os +import re +import sys +from contextlib import contextmanager + +from qapi.common import * +from qapi.schema import QAPISchemaVisitor + + +class QAPIGen(object): + + def __init__(self, fname): + self.fname = fname + self._preamble = '' + self._body = '' + + def preamble_add(self, text): + self._preamble += text + + def add(self, text): + self._body += text + + def get_content(self): + return self._top() + self._preamble + self._body + self._bottom() + + def _top(self): + return '' + + def _bottom(self): + return '' + + def write(self, output_dir): + pathname = os.path.join(output_dir, self.fname) + dir = os.path.dirname(pathname) + if dir: + try: + os.makedirs(dir) + except os.error as e: + if e.errno != errno.EEXIST: + raise + fd = os.open(pathname, os.O_RDWR | os.O_CREAT, 0o666) + if sys.version_info[0] >= 3: + f = open(fd, 'r+', encoding='utf-8') + else: + f = os.fdopen(fd, 'r+') + text = self.get_content() + oldtext = f.read(len(text) + 1) + if text != oldtext: + f.seek(0) + f.truncate(0) + f.write(text) + f.close() + + +def _wrap_ifcond(ifcond, before, after): + if before == after: + return after # suppress empty #if ... #endif + + assert after.startswith(before) + out = before + added = after[len(before):] + if added[0] == '\n': + out += '\n' + added = added[1:] + out += gen_if(ifcond) + out += added + out += gen_endif(ifcond) + return out + + +class QAPIGenCCode(QAPIGen): + + def __init__(self, fname): + QAPIGen.__init__(self, fname) + self._start_if = None + + def start_if(self, ifcond): + assert self._start_if is None + self._start_if = (ifcond, self._body, self._preamble) + + def end_if(self): + assert self._start_if + self._wrap_ifcond() + self._start_if = None + + def _wrap_ifcond(self): + self._body = _wrap_ifcond(self._start_if[0], + self._start_if[1], self._body) + self._preamble = _wrap_ifcond(self._start_if[0], + self._start_if[2], self._preamble) + + def get_content(self): + assert self._start_if is None + return QAPIGen.get_content(self) + + +class QAPIGenC(QAPIGenCCode): + + def __init__(self, fname, blurb, pydoc): + QAPIGenCCode.__init__(self, fname) + self._blurb = blurb + self._copyright = '\n * '.join(re.findall(r'^Copyright .*', pydoc, + re.MULTILINE)) + + def _top(self): + return mcgen(''' +/* AUTOMATICALLY GENERATED, DO NOT MODIFY */ + +/* +%(blurb)s + * + * %(copyright)s + * + * This work is licensed under the terms of the GNU LGPL, version 2.1 or later. + * See the COPYING.LIB file in the top-level directory. + */ + +''', + blurb=self._blurb, copyright=self._copyright) + + def _bottom(self): + return mcgen(''' + +/* Dummy declaration to prevent empty .o file */ +char qapi_dummy_%(name)s; +''', + name=c_fname(self.fname)) + + +class QAPIGenH(QAPIGenC): + + def _top(self): + return QAPIGenC._top(self) + guardstart(self.fname) + + def _bottom(self): + return guardend(self.fname) + + +@contextmanager +def ifcontext(ifcond, *args): + """A 'with' statement context manager to wrap with start_if()/end_if() + + *args: any number of QAPIGenCCode + + Example:: + + with ifcontext(ifcond, self._genh, self._genc): + modify self._genh and self._genc ... + + Is equivalent to calling:: + + self._genh.start_if(ifcond) + self._genc.start_if(ifcond) + modify self._genh and self._genc ... + self._genh.end_if() + self._genc.end_if() + """ + for arg in args: + arg.start_if(ifcond) + yield + for arg in args: + arg.end_if() + + +class QAPIGenDoc(QAPIGen): + + def _top(self): + return (QAPIGen._top(self) + + '@c AUTOMATICALLY GENERATED, DO NOT MODIFY\n\n') + + +class QAPISchemaMonolithicCVisitor(QAPISchemaVisitor): + + def __init__(self, prefix, what, blurb, pydoc): + self._prefix = prefix + self._what = what + self._genc = QAPIGenC(self._prefix + self._what + '.c', + blurb, pydoc) + self._genh = QAPIGenH(self._prefix + self._what + '.h', + blurb, pydoc) + + def write(self, output_dir): + self._genc.write(output_dir) + self._genh.write(output_dir) + + +class QAPISchemaModularCVisitor(QAPISchemaVisitor): + + def __init__(self, prefix, what, blurb, pydoc): + self._prefix = prefix + self._what = what + self._blurb = blurb + self._pydoc = pydoc + self._genc = None + self._genh = None + self._module = {} + self._main_module = None + + @staticmethod + def _is_user_module(name): + return name and not name.startswith('./') + + @staticmethod + def _is_builtin_module(name): + return not name + + def _module_dirname(self, what, name): + if self._is_user_module(name): + return os.path.dirname(name) + return '' + + def _module_basename(self, what, name): + ret = '' if self._is_builtin_module(name) else self._prefix + if self._is_user_module(name): + basename = os.path.basename(name) + ret += what + if name != self._main_module: + ret += '-' + os.path.splitext(basename)[0] + else: + name = name[2:] if name else 'builtin' + ret += re.sub(r'-', '-' + name + '-', what) + return ret + + def _module_filename(self, what, name): + return os.path.join(self._module_dirname(what, name), + self._module_basename(what, name)) + + def _add_module(self, name, blurb): + basename = self._module_filename(self._what, name) + genc = QAPIGenC(basename + '.c', blurb, self._pydoc) + genh = QAPIGenH(basename + '.h', blurb, self._pydoc) + self._module[name] = (genc, genh) + self._set_module(name) + + def _add_user_module(self, name, blurb): + assert self._is_user_module(name) + if self._main_module is None: + self._main_module = name + self._add_module(name, blurb) + + def _add_system_module(self, name, blurb): + self._add_module(name and './' + name, blurb) + + def _set_module(self, name): + self._genc, self._genh = self._module[name] + + def write(self, output_dir, opt_builtins=False): + for name in self._module: + if self._is_builtin_module(name) and not opt_builtins: + continue + (genc, genh) = self._module[name] + genc.write(output_dir) + genh.write(output_dir) + + def _begin_user_module(self, name): + pass + + def visit_module(self, name): + if name in self._module: + self._set_module(name) + elif self._is_builtin_module(name): + # The built-in module has not been created. No code may + # be generated. + self._genc = None + self._genh = None + else: + self._add_user_module(name, self._blurb) + self._begin_user_module(name) + + def visit_include(self, name, info): + relname = os.path.relpath(self._module_filename(self._what, name), + os.path.dirname(self._genh.fname)) + self._genh.preamble_add(mcgen(''' +#include "%(relname)s.h" +''', + relname=relname)) |