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qemu/scripts/qapi-commands.py
Eric Blake c1ff0e6c85 qapi-commands: Inline single-use helpers of gen_marshal() 
Originally, gen_marshal_input_visit() (or gen_visitor_input_block()
before commit f1538019) was factored out to make it easy to do two
passes of a visit to each member of a (possibly-implicit) object,
without duplicating lots of code.  But after recent changes, those
visits now occupy a single line of emitted code, and the helper
method has become a series of conditionals both before and after
the one important line, making it rather awkward to see at a glance
what gets emitted on the first (parsing) or second (deallocation)
pass.  It's a lot easier to read the generator code if we just
inline both uses directly into gen_marshal(), without all the
conditionals.

Once we've done that, it's easy to notice that gen_marshal_vars()
is used only once, and inlining it too lets us consolidate some
mcgen() calls that used to be split across helpers.

gen_call() remains a single-use helper function, but it has
enough indentation and complexity that inlining it would hamper
legibility.

No change to generated output.  The fact that the diffstat shows
a net reduction in lines is an argument in favor of this cleanup.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <1458254921-17042-10-git-send-email-eblake@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
2016-03-18 10:29:26 +01:00

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#
# QAPI command marshaller generator
#
# Copyright IBM, Corp. 2011
# Copyright (C) 2014-2016 Red Hat, Inc.
#
# Authors:
# Anthony Liguori <aliguori@us.ibm.com>
# Michael Roth <mdroth@linux.vnet.ibm.com>
# Markus Armbruster <armbru@redhat.com>
#
# This work is licensed under the terms of the GNU GPL, version 2.
# See the COPYING file in the top-level directory.
from qapi import *
import re
def gen_command_decl(name, arg_type, ret_type):
return mcgen('''
%(c_type)s qmp_%(c_name)s(%(params)s);
''',
c_type=(ret_type and ret_type.c_type()) or 'void',
c_name=c_name(name),
params=gen_params(arg_type, 'Error **errp'))
def gen_call(name, arg_type, ret_type):
ret = ''
argstr = ''
if arg_type:
assert not arg_type.variants
for memb in arg_type.members:
if memb.optional:
argstr += 'arg.has_%s, ' % c_name(memb.name)
argstr += 'arg.%s, ' % c_name(memb.name)
lhs = ''
if ret_type:
lhs = 'retval = '
ret = mcgen('''
%(lhs)sqmp_%(c_name)s(%(args)s&err);
''',
c_name=c_name(name), args=argstr, lhs=lhs)
if ret_type:
ret += gen_err_check()
ret += mcgen('''
qmp_marshal_output_%(c_name)s(retval, ret, &err);
''',
c_name=ret_type.c_name())
return ret
def gen_marshal_output(ret_type):
return mcgen('''
static void qmp_marshal_output_%(c_name)s(%(c_type)s ret_in, QObject **ret_out, Error **errp)
{
Error *err = NULL;
QmpOutputVisitor *qov = qmp_output_visitor_new();
QapiDeallocVisitor *qdv;
Visitor *v;
v = qmp_output_get_visitor(qov);
visit_type_%(c_name)s(v, "unused", &ret_in, &err);
if (err) {
goto out;
}
*ret_out = qmp_output_get_qobject(qov);
out:
error_propagate(errp, err);
qmp_output_visitor_cleanup(qov);
qdv = qapi_dealloc_visitor_new();
v = qapi_dealloc_get_visitor(qdv);
visit_type_%(c_name)s(v, "unused", &ret_in, NULL);
qapi_dealloc_visitor_cleanup(qdv);
}
''',
c_type=ret_type.c_type(), c_name=ret_type.c_name())
def gen_marshal_proto(name):
ret = 'void qmp_marshal_%s(QDict *args, QObject **ret, Error **errp)' % c_name(name)
if not middle_mode:
ret = 'static ' + ret
return ret
def gen_marshal_decl(name):
return mcgen('''
%(proto)s;
''',
proto=gen_marshal_proto(name))
def gen_marshal(name, arg_type, ret_type):
ret = mcgen('''
%(proto)s
{
Error *err = NULL;
''',
proto=gen_marshal_proto(name))
if ret_type:
ret += mcgen('''
%(c_type)s retval;
''',
c_type=ret_type.c_type())
if arg_type and arg_type.members:
ret += mcgen('''
QmpInputVisitor *qiv = qmp_input_visitor_new_strict(QOBJECT(args));
QapiDeallocVisitor *qdv;
Visitor *v;
%(c_name)s arg = {0};
v = qmp_input_get_visitor(qiv);
visit_type_%(c_name)s_members(v, &arg, &err);
if (err) {
goto out;
}
''',
c_name=arg_type.c_name())
else:
ret += mcgen('''
(void)args;
''')
ret += gen_call(name, arg_type, ret_type)
# 'goto out' produced above for arg_type, and by gen_call() for ret_type
if (arg_type and arg_type.members) or ret_type:
ret += mcgen('''
out:
''')
ret += mcgen('''
error_propagate(errp, err);
''')
if arg_type and arg_type.members:
ret += mcgen('''
qmp_input_visitor_cleanup(qiv);
qdv = qapi_dealloc_visitor_new();
v = qapi_dealloc_get_visitor(qdv);
visit_type_%(c_name)s_members(v, &arg, NULL);
qapi_dealloc_visitor_cleanup(qdv);
''',
c_name=arg_type.c_name())
ret += mcgen('''
}
''')
return ret
def gen_register_command(name, success_response):
options = 'QCO_NO_OPTIONS'
if not success_response:
options = 'QCO_NO_SUCCESS_RESP'
ret = mcgen('''
qmp_register_command("%(name)s", qmp_marshal_%(c_name)s, %(opts)s);
''',
name=name, c_name=c_name(name),
opts=options)
return ret
def gen_registry(registry):
ret = mcgen('''
static void qmp_init_marshal(void)
{
''')
ret += registry
ret += mcgen('''
}
qapi_init(qmp_init_marshal);
''')
return ret
class QAPISchemaGenCommandVisitor(QAPISchemaVisitor):
def __init__(self):
self.decl = None
self.defn = None
self._regy = None
self._visited_ret_types = None
def visit_begin(self, schema):
self.decl = ''
self.defn = ''
self._regy = ''
self._visited_ret_types = set()
def visit_end(self):
if not middle_mode:
self.defn += gen_registry(self._regy)
self._regy = None
self._visited_ret_types = None
def visit_command(self, name, info, arg_type, ret_type,
gen, success_response):
if not gen:
return
self.decl += gen_command_decl(name, arg_type, ret_type)
if ret_type and ret_type not in self._visited_ret_types:
self._visited_ret_types.add(ret_type)
self.defn += gen_marshal_output(ret_type)
if middle_mode:
self.decl += gen_marshal_decl(name)
self.defn += gen_marshal(name, arg_type, ret_type)
if not middle_mode:
self._regy += gen_register_command(name, success_response)
middle_mode = False
(input_file, output_dir, do_c, do_h, prefix, opts) = \
parse_command_line("m", ["middle"])
for o, a in opts:
if o in ("-m", "--middle"):
middle_mode = True
c_comment = '''
/*
* schema-defined QMP->QAPI command dispatch
*
* Copyright IBM, Corp. 2011
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
*
* 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.
*
*/
'''
h_comment = '''
/*
* schema-defined QAPI function prototypes
*
* Copyright IBM, Corp. 2011
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
*
* 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.
*
*/
'''
(fdef, fdecl) = open_output(output_dir, do_c, do_h, prefix,
'qmp-marshal.c', 'qmp-commands.h',
c_comment, h_comment)
fdef.write(mcgen('''
#include "qemu/osdep.h"
#include "qemu-common.h"
#include "qemu/module.h"
#include "qapi/qmp/types.h"
#include "qapi/qmp/dispatch.h"
#include "qapi/visitor.h"
#include "qapi/qmp-output-visitor.h"
#include "qapi/qmp-input-visitor.h"
#include "qapi/dealloc-visitor.h"
#include "%(prefix)sqapi-types.h"
#include "%(prefix)sqapi-visit.h"
#include "%(prefix)sqmp-commands.h"
''',
prefix=prefix))
fdecl.write(mcgen('''
#include "%(prefix)sqapi-types.h"
#include "qapi/qmp/qdict.h"
#include "qapi/error.h"
''',
prefix=prefix))
schema = QAPISchema(input_file)
gen = QAPISchemaGenCommandVisitor()
schema.visit(gen)
fdef.write(gen.defn)
fdecl.write(gen.decl)
close_output(fdef, fdecl)
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