qemu-e2k/scripts/qapi-visit.py

485 lines
12 KiB
Python

#
# QAPI visitor generator
#
# Copyright IBM, Corp. 2011
# Copyright (C) 2014-2015 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 ordereddict import OrderedDict
from qapi import *
import re
implicit_structs = []
def generate_visit_implicit_struct(type):
global implicit_structs
if type in implicit_structs:
return ''
implicit_structs.append(type)
return mcgen('''
static void visit_type_implicit_%(c_type)s(Visitor *m, %(c_type)s **obj, Error **errp)
{
Error *err = NULL;
visit_start_implicit_struct(m, (void **)obj, sizeof(%(c_type)s), &err);
if (!err) {
visit_type_%(c_type)s_fields(m, obj, errp);
visit_end_implicit_struct(m, &err);
}
error_propagate(errp, err);
}
''',
c_type=type_name(type))
def generate_visit_struct_fields(name, members, base = None):
substructs = []
ret = ''
if base:
ret += generate_visit_implicit_struct(base)
ret += mcgen('''
static void visit_type_%(name)s_fields(Visitor *m, %(name)s **obj, Error **errp)
{
Error *err = NULL;
''',
name=c_name(name))
push_indent()
if base:
ret += mcgen('''
visit_type_implicit_%(type)s(m, &(*obj)->%(c_name)s, &err);
if (err) {
goto out;
}
''',
type=type_name(base), c_name=c_name('base'))
for argname, argentry, optional in parse_args(members):
if optional:
ret += mcgen('''
visit_optional(m, &(*obj)->has_%(c_name)s, "%(name)s", &err);
if (!err && (*obj)->has_%(c_name)s) {
''',
c_name=c_name(argname), name=argname)
push_indent()
ret += mcgen('''
visit_type_%(type)s(m, &(*obj)->%(c_name)s, "%(name)s", &err);
''',
type=type_name(argentry), c_name=c_name(argname),
name=argname)
if optional:
pop_indent()
ret += mcgen('''
}
''')
ret += mcgen('''
if (err) {
goto out;
}
''')
pop_indent()
if re.search('^ *goto out\\;', ret, re.MULTILINE):
ret += mcgen('''
out:
''')
ret += mcgen('''
error_propagate(errp, err);
}
''')
return ret
def generate_visit_struct_body(name, members):
ret = mcgen('''
Error *err = NULL;
visit_start_struct(m, (void **)obj, "%(name)s", name, sizeof(%(c_name)s), &err);
if (!err) {
if (*obj) {
visit_type_%(c_name)s_fields(m, obj, errp);
}
visit_end_struct(m, &err);
}
error_propagate(errp, err);
''',
name=name, c_name=c_name(name))
return ret
def generate_visit_struct(expr):
name = expr['struct']
members = expr['data']
base = expr.get('base')
ret = generate_visit_struct_fields(name, members, base)
ret += mcgen('''
void visit_type_%(name)s(Visitor *m, %(name)s **obj, const char *name, Error **errp)
{
''',
name=c_name(name))
ret += generate_visit_struct_body(name, members)
ret += mcgen('''
}
''')
return ret
def generate_visit_list(name, members):
return mcgen('''
void visit_type_%(name)sList(Visitor *m, %(name)sList **obj, const char *name, Error **errp)
{
Error *err = NULL;
GenericList *i, **prev;
visit_start_list(m, name, &err);
if (err) {
goto out;
}
for (prev = (GenericList **)obj;
!err && (i = visit_next_list(m, prev, &err)) != NULL;
prev = &i) {
%(name)sList *native_i = (%(name)sList *)i;
visit_type_%(name)s(m, &native_i->value, NULL, &err);
}
error_propagate(errp, err);
err = NULL;
visit_end_list(m, &err);
out:
error_propagate(errp, err);
}
''',
name=type_name(name))
def generate_visit_enum(name, members):
return mcgen('''
void visit_type_%(name)s(Visitor *m, %(name)s *obj, const char *name, Error **errp)
{
visit_type_enum(m, (int *)obj, %(name)s_lookup, "%(name)s", name, errp);
}
''',
name=c_name(name))
def generate_visit_alternate(name, members):
ret = mcgen('''
void visit_type_%(name)s(Visitor *m, %(name)s **obj, const char *name, Error **errp)
{
Error *err = NULL;
visit_start_implicit_struct(m, (void**) obj, sizeof(%(name)s), &err);
if (err) {
goto out;
}
visit_get_next_type(m, (int*) &(*obj)->kind, %(name)s_qtypes, name, &err);
if (err) {
goto out_end;
}
switch ((*obj)->kind) {
''',
name=c_name(name))
# For alternate, always use the default enum type automatically generated
# as name + 'Kind'
disc_type = c_name(name) + 'Kind'
for key in members:
assert (members[key] in builtin_types.keys()
or find_struct(members[key])
or find_union(members[key])
or find_enum(members[key])), "Invalid alternate member"
enum_full_value = c_enum_const(disc_type, key)
ret += mcgen('''
case %(enum_full_value)s:
visit_type_%(c_type)s(m, &(*obj)->%(c_name)s, name, &err);
break;
''',
enum_full_value = enum_full_value,
c_type = type_name(members[key]),
c_name = c_name(key))
ret += mcgen('''
default:
abort();
}
out_end:
error_propagate(errp, err);
err = NULL;
visit_end_implicit_struct(m, &err);
out:
error_propagate(errp, err);
}
''')
return ret
def generate_visit_union(expr):
name = expr['union']
members = expr['data']
base = expr.get('base')
discriminator = expr.get('discriminator')
enum_define = discriminator_find_enum_define(expr)
if enum_define:
# Use the enum type as discriminator
ret = ""
disc_type = c_name(enum_define['enum_name'])
else:
# There will always be a discriminator in the C switch code, by default
# it is an enum type generated silently
ret = generate_visit_enum(name + 'Kind', members.keys())
disc_type = c_name(name) + 'Kind'
if base:
assert discriminator
base_fields = find_struct(base)['data'].copy()
del base_fields[discriminator]
ret += generate_visit_struct_fields(name, base_fields)
if discriminator:
for key in members:
ret += generate_visit_implicit_struct(members[key])
ret += mcgen('''
void visit_type_%(name)s(Visitor *m, %(name)s **obj, const char *name, Error **errp)
{
Error *err = NULL;
visit_start_struct(m, (void **)obj, "%(name)s", name, sizeof(%(name)s), &err);
if (err) {
goto out;
}
if (*obj) {
''',
name=c_name(name))
if base:
ret += mcgen('''
visit_type_%(name)s_fields(m, obj, &err);
if (err) {
goto out_obj;
}
''',
name=c_name(name))
if not discriminator:
disc_key = "type"
else:
disc_key = discriminator
ret += mcgen('''
visit_type_%(disc_type)s(m, &(*obj)->kind, "%(disc_key)s", &err);
if (err) {
goto out_obj;
}
if (!visit_start_union(m, !!(*obj)->data, &err) || err) {
goto out_obj;
}
switch ((*obj)->kind) {
''',
disc_type = disc_type,
disc_key = disc_key)
for key in members:
if not discriminator:
fmt = 'visit_type_%(c_type)s(m, &(*obj)->%(c_name)s, "data", &err);'
else:
fmt = 'visit_type_implicit_%(c_type)s(m, &(*obj)->%(c_name)s, &err);'
enum_full_value = c_enum_const(disc_type, key)
ret += mcgen('''
case %(enum_full_value)s:
''' + fmt + '''
break;
''',
enum_full_value = enum_full_value,
c_type=type_name(members[key]),
c_name=c_name(key))
ret += mcgen('''
default:
abort();
}
out_obj:
error_propagate(errp, err);
err = NULL;
visit_end_union(m, !!(*obj)->data, &err);
error_propagate(errp, err);
err = NULL;
}
visit_end_struct(m, &err);
out:
error_propagate(errp, err);
}
''')
return ret
def generate_declaration(name, members, builtin_type=False):
ret = ""
if not builtin_type:
name = c_name(name)
ret += mcgen('''
void visit_type_%(name)s(Visitor *m, %(name)s **obj, const char *name, Error **errp);
''',
name=name)
ret += mcgen('''
void visit_type_%(name)sList(Visitor *m, %(name)sList **obj, const char *name, Error **errp);
''',
name=name)
return ret
def generate_enum_declaration(name, members):
ret = mcgen('''
void visit_type_%(name)sList(Visitor *m, %(name)sList **obj, const char *name, Error **errp);
''',
name=c_name(name))
return ret
def generate_decl_enum(name, members):
return mcgen('''
void visit_type_%(name)s(Visitor *m, %(name)s *obj, const char *name, Error **errp);
''',
name=c_name(name))
do_builtins = False
(input_file, output_dir, do_c, do_h, prefix, opts) = \
parse_command_line("b", ["builtins"])
for o, a in opts:
if o in ("-b", "--builtins"):
do_builtins = True
c_comment = '''
/*
* schema-defined QAPI visitor functions
*
* 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 visitor functions
*
* 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,
'qapi-visit.c', 'qapi-visit.h',
c_comment, h_comment)
fdef.write(mcgen('''
#include "qemu-common.h"
#include "%(prefix)sqapi-visit.h"
''',
prefix = prefix))
fdecl.write(mcgen('''
#include "qapi/visitor.h"
#include "%(prefix)sqapi-types.h"
''',
prefix=prefix))
exprs = parse_schema(input_file)
# to avoid header dependency hell, we always generate declarations
# for built-in types in our header files and simply guard them
fdecl.write(guardstart("QAPI_VISIT_BUILTIN_VISITOR_DECL"))
for typename in builtin_types.keys():
fdecl.write(generate_declaration(typename, None, builtin_type=True))
fdecl.write(guardend("QAPI_VISIT_BUILTIN_VISITOR_DECL"))
# ...this doesn't work for cases where we link in multiple objects that
# have the functions defined, so we use -b option to provide control
# over these cases
if do_builtins:
for typename in builtin_types.keys():
fdef.write(generate_visit_list(typename, None))
for expr in exprs:
if expr.has_key('struct'):
ret = generate_visit_struct(expr)
ret += generate_visit_list(expr['struct'], expr['data'])
fdef.write(ret)
ret = generate_declaration(expr['struct'], expr['data'])
fdecl.write(ret)
elif expr.has_key('union'):
ret = generate_visit_union(expr)
ret += generate_visit_list(expr['union'], expr['data'])
fdef.write(ret)
enum_define = discriminator_find_enum_define(expr)
ret = ""
if not enum_define:
ret = generate_decl_enum('%sKind' % expr['union'],
expr['data'].keys())
ret += generate_declaration(expr['union'], expr['data'])
fdecl.write(ret)
elif expr.has_key('alternate'):
ret = generate_visit_alternate(expr['alternate'], expr['data'])
ret += generate_visit_list(expr['alternate'], expr['data'])
fdef.write(ret)
ret = generate_decl_enum('%sKind' % expr['alternate'],
expr['data'].keys())
ret += generate_declaration(expr['alternate'], expr['data'])
fdecl.write(ret)
elif expr.has_key('enum'):
ret = generate_visit_list(expr['enum'], expr['data'])
ret += generate_visit_enum(expr['enum'], expr['data'])
fdef.write(ret)
ret = generate_decl_enum(expr['enum'], expr['data'])
ret += generate_enum_declaration(expr['enum'], expr['data'])
fdecl.write(ret)
close_output(fdef, fdecl)