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5710153e73
is_c_ptr() looks whether the end of the C text for the type looks like a pointer. Works, but is fragile. We now have a better tool: use QAPISchemaType method c_null(). The initializers for non-pointers become prettier: 0, false or the enumeration constant with the value 0 instead of {0}. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Daniel P. Berrange <berrange@redhat.com> Message-Id: <1442401589-24189-13-git-send-email-armbru@redhat.com>
375 lines
8.9 KiB
Python
375 lines
8.9 KiB
Python
#
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# QAPI command marshaller generator
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#
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# Copyright IBM, Corp. 2011
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# Copyright (C) 2014-2015 Red Hat, Inc.
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#
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# Authors:
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# Anthony Liguori <aliguori@us.ibm.com>
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# Michael Roth <mdroth@linux.vnet.ibm.com>
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# Markus Armbruster <armbru@redhat.com>
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#
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# This work is licensed under the terms of the GNU GPL, version 2.
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# See the COPYING file in the top-level directory.
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from qapi import *
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import re
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def generate_command_decl(name, args, ret_type):
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arglist=""
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if args:
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for memb in args.members:
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argtype = memb.type.c_type(is_param=True)
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if memb.optional:
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arglist += "bool has_%s, " % c_name(memb.name)
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arglist += "%s %s, " % (argtype, c_name(memb.name))
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return mcgen('''
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%(ret_type)s qmp_%(name)s(%(args)sError **errp);
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''',
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ret_type=(ret_type and ret_type.c_type()) or 'void',
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name=c_name(name),
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args=arglist)
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def gen_err_check(err):
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if not err:
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return ''
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return mcgen('''
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if (%(err)s) {
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goto out;
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}
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''',
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err=err)
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def gen_sync_call(name, args, ret_type):
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ret = ""
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arglist=""
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retval=""
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if ret_type:
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retval = "retval = "
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if args:
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for memb in args.members:
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if memb.optional:
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arglist += "has_%s, " % c_name(memb.name)
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arglist += "%s, " % c_name(memb.name)
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push_indent()
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ret = mcgen('''
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%(retval)sqmp_%(name)s(%(args)s&local_err);
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''',
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name=c_name(name), args=arglist, retval=retval)
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if ret_type:
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ret += gen_err_check('local_err')
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ret += mcgen('''
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qmp_marshal_output_%(c_name)s(retval, ret, &local_err);
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''',
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c_name=c_name(name))
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pop_indent()
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return ret
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def gen_visitor_input_containers_decl(args):
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ret = ""
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push_indent()
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if args:
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ret += mcgen('''
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QmpInputVisitor *mi = qmp_input_visitor_new_strict(QOBJECT(args));
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QapiDeallocVisitor *md;
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Visitor *v;
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''')
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pop_indent()
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return ret
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def gen_visitor_input_vars_decl(args):
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ret = ""
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push_indent()
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if args:
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for memb in args.members:
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if memb.optional:
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ret += mcgen('''
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bool has_%(argname)s = false;
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''',
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argname=c_name(memb.name))
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ret += mcgen('''
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%(c_type)s %(c_name)s = %(c_null)s;
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''',
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c_name=c_name(memb.name),
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c_type=memb.type.c_type(),
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c_null=memb.type.c_null())
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pop_indent()
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return ret
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def gen_visitor_input_block(args, dealloc=False):
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ret = ""
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errparg = '&local_err'
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errarg = 'local_err'
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if not args:
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return ret
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push_indent()
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if dealloc:
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errparg = 'NULL'
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errarg = None;
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ret += mcgen('''
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qmp_input_visitor_cleanup(mi);
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md = qapi_dealloc_visitor_new();
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v = qapi_dealloc_get_visitor(md);
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''')
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else:
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ret += mcgen('''
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v = qmp_input_get_visitor(mi);
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''')
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for memb in args.members:
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if memb.optional:
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ret += mcgen('''
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visit_optional(v, &has_%(c_name)s, "%(name)s", %(errp)s);
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''',
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c_name=c_name(memb.name), name=memb.name,
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errp=errparg)
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ret += gen_err_check(errarg)
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ret += mcgen('''
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if (has_%(c_name)s) {
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''',
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c_name=c_name(memb.name))
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push_indent()
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ret += mcgen('''
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visit_type_%(visitor)s(v, &%(c_name)s, "%(name)s", %(errp)s);
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''',
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c_name=c_name(memb.name), name=memb.name,
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visitor=memb.type.c_name(), errp=errparg)
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ret += gen_err_check(errarg)
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if memb.optional:
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pop_indent()
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ret += mcgen('''
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}
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''')
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if dealloc:
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ret += mcgen('''
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qapi_dealloc_visitor_cleanup(md);
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''')
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pop_indent()
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return ret
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def gen_marshal_output(name, ret_type):
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if not ret_type:
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return ""
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ret = mcgen('''
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static void qmp_marshal_output_%(c_name)s(%(c_ret_type)s ret_in, QObject **ret_out, Error **errp)
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{
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Error *local_err = NULL;
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QmpOutputVisitor *mo = qmp_output_visitor_new();
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QapiDeallocVisitor *md;
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Visitor *v;
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v = qmp_output_get_visitor(mo);
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visit_type_%(visitor)s(v, &ret_in, "unused", &local_err);
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if (local_err) {
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goto out;
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}
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*ret_out = qmp_output_get_qobject(mo);
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out:
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error_propagate(errp, local_err);
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qmp_output_visitor_cleanup(mo);
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md = qapi_dealloc_visitor_new();
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v = qapi_dealloc_get_visitor(md);
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visit_type_%(visitor)s(v, &ret_in, "unused", NULL);
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qapi_dealloc_visitor_cleanup(md);
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}
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''',
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c_ret_type=ret_type.c_type(), c_name=c_name(name),
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visitor=ret_type.c_name())
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return ret
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def gen_marshal_input_decl(name, middle_mode):
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ret = 'void qmp_marshal_input_%s(QDict *args, QObject **ret, Error **errp)' % c_name(name)
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if not middle_mode:
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ret = "static " + ret
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return ret
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def gen_marshal_input(name, args, ret_type, middle_mode):
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hdr = gen_marshal_input_decl(name, middle_mode)
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ret = mcgen('''
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%(header)s
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{
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Error *local_err = NULL;
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''',
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header=hdr)
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if ret_type:
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ret += mcgen('''
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%(c_type)s retval;
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''',
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c_type=ret_type.c_type())
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if args:
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ret += gen_visitor_input_containers_decl(args)
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ret += gen_visitor_input_vars_decl(args) + '\n'
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ret += gen_visitor_input_block(args) + '\n'
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else:
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ret += mcgen('''
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(void)args;
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''')
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ret += gen_sync_call(name, args, ret_type)
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if re.search('^ *goto out\\;', ret, re.MULTILINE):
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ret += mcgen('''
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out:
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''')
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ret += mcgen('''
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error_propagate(errp, local_err);
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''')
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ret += gen_visitor_input_block(args, dealloc=True)
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ret += mcgen('''
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}
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''')
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return ret
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def gen_register_command(name, success_response):
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push_indent()
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options = 'QCO_NO_OPTIONS'
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if not success_response:
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options = 'QCO_NO_SUCCESS_RESP'
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ret = mcgen('''
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qmp_register_command("%(name)s", qmp_marshal_input_%(c_name)s, %(opts)s);
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''',
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name=name, c_name=c_name(name),
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opts=options)
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pop_indent()
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return ret
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def gen_registry(registry):
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ret = mcgen('''
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static void qmp_init_marshal(void)
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{
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''')
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ret += registry
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ret += mcgen('''
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}
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qapi_init(qmp_init_marshal);
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''')
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return ret
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class QAPISchemaGenCommandVisitor(QAPISchemaVisitor):
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def __init__(self):
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self.decl = None
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self.defn = None
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self._regy = None
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def visit_begin(self, schema):
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self.decl = ''
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self.defn = ''
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self._regy = ''
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def visit_end(self):
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if not middle_mode:
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self.defn += gen_registry(self._regy)
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self._regy = None
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def visit_command(self, name, info, arg_type, ret_type,
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gen, success_response):
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if not gen:
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return
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self.decl += generate_command_decl(name, arg_type, ret_type)
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if ret_type:
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self.defn += gen_marshal_output(name, ret_type)
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if middle_mode:
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self.decl += gen_marshal_input_decl(name, middle_mode) + ';\n'
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self.defn += gen_marshal_input(name, arg_type, ret_type, middle_mode)
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if not middle_mode:
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self._regy += gen_register_command(name, success_response)
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middle_mode = False
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(input_file, output_dir, do_c, do_h, prefix, opts) = \
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parse_command_line("m", ["middle"])
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for o, a in opts:
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if o in ("-m", "--middle"):
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middle_mode = True
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c_comment = '''
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/*
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* schema-defined QMP->QAPI command dispatch
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*
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* Copyright IBM, Corp. 2011
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
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* See the COPYING.LIB file in the top-level directory.
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*
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*/
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'''
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h_comment = '''
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/*
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* schema-defined QAPI function prototypes
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*
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* Copyright IBM, Corp. 2011
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
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* See the COPYING.LIB file in the top-level directory.
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*
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*/
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'''
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(fdef, fdecl) = open_output(output_dir, do_c, do_h, prefix,
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'qmp-marshal.c', 'qmp-commands.h',
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c_comment, h_comment)
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fdef.write(mcgen('''
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#include "qemu-common.h"
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#include "qemu/module.h"
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#include "qapi/qmp/types.h"
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#include "qapi/qmp/dispatch.h"
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#include "qapi/visitor.h"
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#include "qapi/qmp-output-visitor.h"
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#include "qapi/qmp-input-visitor.h"
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#include "qapi/dealloc-visitor.h"
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#include "%(prefix)sqapi-types.h"
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#include "%(prefix)sqapi-visit.h"
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#include "%(prefix)sqmp-commands.h"
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''',
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prefix=prefix))
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fdecl.write(mcgen('''
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#include "%(prefix)sqapi-types.h"
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#include "qapi/qmp/qdict.h"
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#include "qapi/error.h"
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''',
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prefix=prefix))
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schema = QAPISchema(input_file)
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gen = QAPISchemaGenCommandVisitor()
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schema.visit(gen)
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fdef.write(gen.defn)
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fdecl.write(gen.decl)
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close_output(fdef, fdecl)
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