0aef92b90d
This implements the visitor part of base types for unions. Parsed into
QMP, this example schema definition...
{ 'type': 'BlockOptionsBase', 'data': { 'read-only': 'bool' } }
{ 'type': 'BlockOptionsQcow2, 'data': { 'lazy-refcounts': 'bool' } }
{ 'union': 'BlockOptions',
'base': 'BlockOptionsBase',
'data': {
'raw': 'BlockOptionsRaw'
'qcow2': 'BlockOptionsQcow2'
} }
...would describe the following JSON object:
{ "type": "qcow2",
"read-only": true,
"data": { "lazy-refcounts": false } }
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
416 lines
10 KiB
Python
416 lines
10 KiB
Python
#
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# QAPI visitor generator
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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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# Michael Roth <mdroth@linux.vnet.ibm.com>
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#
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# This work is licensed under the terms of the GNU GPLv2.
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# See the COPYING.LIB file in the top-level directory.
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from ordereddict import OrderedDict
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from qapi import *
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import sys
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import os
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import getopt
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import errno
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def generate_visit_struct_fields(field_prefix, members):
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ret = ''
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for argname, argentry, optional, structured in parse_args(members):
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if optional:
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ret += mcgen('''
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visit_start_optional(m, obj ? &(*obj)->%(c_prefix)shas_%(c_name)s : NULL, "%(name)s", &err);
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if (obj && (*obj)->%(prefix)shas_%(c_name)s) {
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''',
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c_prefix=c_var(field_prefix), prefix=field_prefix,
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c_name=c_var(argname), name=argname)
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push_indent()
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if structured:
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ret += generate_visit_struct_body(field_prefix + argname, argname, argentry)
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else:
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ret += mcgen('''
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visit_type_%(type)s(m, obj ? &(*obj)->%(c_prefix)s%(c_name)s : NULL, "%(name)s", &err);
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''',
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c_prefix=c_var(field_prefix), prefix=field_prefix,
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type=type_name(argentry), c_name=c_var(argname),
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name=argname)
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if optional:
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pop_indent()
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ret += mcgen('''
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}
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visit_end_optional(m, &err);
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''')
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return ret
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def generate_visit_struct_body(field_prefix, name, members):
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ret = mcgen('''
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if (!error_is_set(errp)) {
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''')
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push_indent()
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if len(field_prefix):
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field_prefix = field_prefix + "."
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ret += mcgen('''
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Error **errp = &err; /* from outer scope */
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Error *err = NULL;
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visit_start_struct(m, NULL, "", "%(name)s", 0, &err);
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''',
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name=name)
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else:
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ret += mcgen('''
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Error *err = NULL;
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visit_start_struct(m, (void **)obj, "%(name)s", name, sizeof(%(name)s), &err);
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''',
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name=name)
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ret += mcgen('''
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if (!err) {
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if (!obj || *obj) {
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''')
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push_indent()
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push_indent()
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ret += generate_visit_struct_fields(field_prefix, members)
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pop_indent()
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ret += mcgen('''
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error_propagate(errp, err);
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err = NULL;
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}
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''')
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pop_indent()
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pop_indent()
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ret += mcgen('''
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/* Always call end_struct if start_struct succeeded. */
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visit_end_struct(m, &err);
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}
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error_propagate(errp, err);
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}
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''')
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return ret
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def generate_visit_struct(name, members):
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ret = mcgen('''
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void visit_type_%(name)s(Visitor *m, %(name)s ** obj, const char *name, Error **errp)
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{
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''',
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name=name)
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push_indent()
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ret += generate_visit_struct_body("", name, members)
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pop_indent()
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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 generate_visit_list(name, members):
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return mcgen('''
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void visit_type_%(name)sList(Visitor *m, %(name)sList ** obj, const char *name, Error **errp)
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{
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GenericList *i, **prev = (GenericList **)obj;
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Error *err = NULL;
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if (!error_is_set(errp)) {
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visit_start_list(m, name, &err);
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if (!err) {
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for (; (i = visit_next_list(m, prev, &err)) != NULL; prev = &i) {
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%(name)sList *native_i = (%(name)sList *)i;
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visit_type_%(name)s(m, &native_i->value, NULL, &err);
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}
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error_propagate(errp, err);
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err = NULL;
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/* Always call end_list if start_list succeeded. */
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visit_end_list(m, &err);
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}
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error_propagate(errp, err);
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}
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}
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''',
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name=name)
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def generate_visit_enum(name, members):
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return mcgen('''
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void visit_type_%(name)s(Visitor *m, %(name)s * obj, const char *name, Error **errp)
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{
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visit_type_enum(m, (int *)obj, %(name)s_lookup, "%(name)s", name, errp);
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}
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''',
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name=name)
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def generate_visit_union(expr):
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name = expr['union']
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members = expr['data']
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base = expr.get('base')
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ret = generate_visit_enum('%sKind' % name, members.keys())
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ret += mcgen('''
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void visit_type_%(name)s(Visitor *m, %(name)s ** obj, const char *name, Error **errp)
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{
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Error *err = NULL;
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if (!error_is_set(errp)) {
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visit_start_struct(m, (void **)obj, "%(name)s", name, sizeof(%(name)s), &err);
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if (!err) {
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if (obj && *obj) {
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''',
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name=name)
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push_indent()
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push_indent()
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push_indent()
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if base:
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struct = find_struct(base)
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push_indent()
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ret += generate_visit_struct_fields("", struct['data'])
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pop_indent()
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pop_indent()
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ret += mcgen('''
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visit_type_%(name)sKind(m, &(*obj)->kind, "type", &err);
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if (!err) {
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switch ((*obj)->kind) {
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''',
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name=name)
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for key in members:
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ret += mcgen('''
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case %(abbrev)s_KIND_%(enum)s:
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visit_type_%(c_type)s(m, &(*obj)->%(c_name)s, "data", &err);
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break;
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''',
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abbrev = de_camel_case(name).upper(),
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enum = c_fun(de_camel_case(key),False).upper(),
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c_type=type_name(members[key]),
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c_name=c_fun(key))
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ret += mcgen('''
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default:
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abort();
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}
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}
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error_propagate(errp, err);
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err = NULL;
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}
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''')
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pop_indent()
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ret += mcgen('''
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/* Always call end_struct if start_struct succeeded. */
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visit_end_struct(m, &err);
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}
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error_propagate(errp, err);
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}
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''')
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pop_indent();
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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 generate_declaration(name, members, genlist=True, builtin_type=False):
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ret = ""
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if not builtin_type:
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ret += mcgen('''
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void visit_type_%(name)s(Visitor *m, %(name)s ** obj, const char *name, Error **errp);
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''',
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name=name)
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if genlist:
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ret += mcgen('''
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void visit_type_%(name)sList(Visitor *m, %(name)sList ** obj, const char *name, Error **errp);
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''',
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name=name)
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return ret
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def generate_enum_declaration(name, members, genlist=True):
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ret = ""
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if genlist:
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ret += mcgen('''
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void visit_type_%(name)sList(Visitor *m, %(name)sList ** obj, const char *name, Error **errp);
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''',
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name=name)
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return ret
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def generate_decl_enum(name, members, genlist=True):
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return mcgen('''
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void visit_type_%(name)s(Visitor *m, %(name)s * obj, const char *name, Error **errp);
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''',
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name=name)
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try:
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opts, args = getopt.gnu_getopt(sys.argv[1:], "chbp:o:",
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["source", "header", "builtins", "prefix=",
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"output-dir="])
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except getopt.GetoptError, err:
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print str(err)
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sys.exit(1)
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output_dir = ""
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prefix = ""
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c_file = 'qapi-visit.c'
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h_file = 'qapi-visit.h'
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do_c = False
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do_h = False
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do_builtins = False
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for o, a in opts:
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if o in ("-p", "--prefix"):
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prefix = a
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elif o in ("-o", "--output-dir"):
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output_dir = a + "/"
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elif o in ("-c", "--source"):
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do_c = True
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elif o in ("-h", "--header"):
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do_h = True
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elif o in ("-b", "--builtins"):
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do_builtins = True
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if not do_c and not do_h:
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do_c = True
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do_h = True
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c_file = output_dir + prefix + c_file
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h_file = output_dir + prefix + h_file
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try:
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os.makedirs(output_dir)
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except os.error, e:
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if e.errno != errno.EEXIST:
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raise
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def maybe_open(really, name, opt):
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if really:
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return open(name, opt)
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else:
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import StringIO
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return StringIO.StringIO()
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fdef = maybe_open(do_c, c_file, 'w')
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fdecl = maybe_open(do_h, h_file, 'w')
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fdef.write(mcgen('''
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/* THIS FILE IS AUTOMATICALLY GENERATED, DO NOT MODIFY */
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/*
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* schema-defined QAPI visitor functions
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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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#include "qemu-common.h"
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#include "%(header)s"
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''',
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header=basename(h_file)))
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fdecl.write(mcgen('''
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/* THIS FILE IS AUTOMATICALLY GENERATED, DO NOT MODIFY */
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/*
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* schema-defined QAPI visitor function
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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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#ifndef %(guard)s
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#define %(guard)s
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#include "qapi/visitor.h"
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#include "%(prefix)sqapi-types.h"
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''',
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prefix=prefix, guard=guardname(h_file)))
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exprs = parse_schema(sys.stdin)
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# to avoid header dependency hell, we always generate declarations
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# for built-in types in our header files and simply guard them
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fdecl.write(guardstart("QAPI_VISIT_BUILTIN_VISITOR_DECL"))
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for typename in builtin_types:
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fdecl.write(generate_declaration(typename, None, genlist=True,
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builtin_type=True))
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fdecl.write(guardend("QAPI_VISIT_BUILTIN_VISITOR_DECL"))
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# ...this doesn't work for cases where we link in multiple objects that
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# have the functions defined, so we use -b option to provide control
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# over these cases
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if do_builtins:
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fdef.write(guardstart("QAPI_VISIT_BUILTIN_VISITOR_DEF"))
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for typename in builtin_types:
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fdef.write(generate_visit_list(typename, None))
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fdef.write(guardend("QAPI_VISIT_BUILTIN_VISITOR_DEF"))
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for expr in exprs:
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if expr.has_key('type'):
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ret = generate_visit_struct(expr['type'], expr['data'])
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ret += generate_visit_list(expr['type'], expr['data'])
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fdef.write(ret)
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ret = generate_declaration(expr['type'], expr['data'])
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fdecl.write(ret)
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elif expr.has_key('union'):
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ret = generate_visit_union(expr)
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ret += generate_visit_list(expr['union'], expr['data'])
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fdef.write(ret)
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ret = generate_decl_enum('%sKind' % expr['union'], expr['data'].keys())
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ret += generate_declaration(expr['union'], expr['data'])
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fdecl.write(ret)
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elif expr.has_key('enum'):
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ret = generate_visit_list(expr['enum'], expr['data'])
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ret += generate_visit_enum(expr['enum'], expr['data'])
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fdef.write(ret)
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ret = generate_decl_enum(expr['enum'], expr['data'])
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ret += generate_enum_declaration(expr['enum'], expr['data'])
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fdecl.write(ret)
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fdecl.write('''
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#endif
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''')
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fdecl.flush()
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fdecl.close()
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fdef.flush()
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fdef.close()
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