aboutsummaryrefslogtreecommitdiff
path: root/scripts/qapi-introspect.py
blob: 541644e3504171210256cad381d27acd2f3c4d45 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
#
# QAPI introspection generator
#
# Copyright (C) 2015-2016 Red Hat, Inc.
#
# Authors:
#  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 *


# Caveman's json.dumps() replacement (we're stuck at Python 2.4)
# TODO try to use json.dumps() once we get unstuck
def to_json(obj, level=0):
    if obj is None:
        ret = 'null'
    elif isinstance(obj, str):
        ret = '"' + obj.replace('"', r'\"') + '"'
    elif isinstance(obj, list):
        elts = [to_json(elt, level + 1)
                for elt in obj]
        ret = '[' + ', '.join(elts) + ']'
    elif isinstance(obj, dict):
        elts = ['"%s": %s' % (key.replace('"', r'\"'),
                              to_json(obj[key], level + 1))
                for key in sorted(obj.keys())]
        ret = '{' + ', '.join(elts) + '}'
    else:
        assert False                # not implemented
    if level == 1:
        ret = '\n' + ret
    return ret


def to_c_string(string):
    return '"' + string.replace('\\', r'\\').replace('"', r'\"') + '"'


class QAPISchemaGenIntrospectVisitor(QAPISchemaVisitor):
    def __init__(self, unmask):
        self._unmask = unmask
        self.defn = None
        self.decl = None
        self._schema = None
        self._jsons = None
        self._used_types = None
        self._name_map = None

    def visit_begin(self, schema):
        self._schema = schema
        self._jsons = []
        self._used_types = []
        self._name_map = {}

    def visit_end(self):
        # visit the types that are actually used
        jsons = self._jsons
        self._jsons = []
        for typ in self._used_types:
            typ.visit(self)
        # generate C
        # TODO can generate awfully long lines
        jsons.extend(self._jsons)
        name = prefix + 'qmp_schema_json'
        self.decl = mcgen('''
extern const char %(c_name)s[];
''',
                          c_name=c_name(name))
        lines = to_json(jsons).split('\n')
        c_string = '\n    '.join([to_c_string(line) for line in lines])
        self.defn = mcgen('''
const char %(c_name)s[] = %(c_string)s;
''',
                          c_name=c_name(name),
                          c_string=c_string)
        self._schema = None
        self._jsons = None
        self._used_types = None
        self._name_map = None

    def visit_needed(self, entity):
        # Ignore types on first pass; visit_end() will pick up used types
        return not isinstance(entity, QAPISchemaType)

    def _name(self, name):
        if self._unmask:
            return name
        if name not in self._name_map:
            self._name_map[name] = '%d' % len(self._name_map)
        return self._name_map[name]

    def _use_type(self, typ):
        # Map the various integer types to plain int
        if typ.json_type() == 'int':
            typ = self._schema.lookup_type('int')
        elif (isinstance(typ, QAPISchemaArrayType) and
              typ.element_type.json_type() == 'int'):
            typ = self._schema.lookup_type('intList')
        # Add type to work queue if new
        if typ not in self._used_types:
            self._used_types.append(typ)
        # Clients should examine commands and events, not types.  Hide
        # type names to reduce the temptation.  Also saves a few
        # characters.
        if isinstance(typ, QAPISchemaBuiltinType):
            return typ.name
        if isinstance(typ, QAPISchemaArrayType):
            return '[' + self._use_type(typ.element_type) + ']'
        return self._name(typ.name)

    def _gen_json(self, name, mtype, obj):
        if mtype not in ('command', 'event', 'builtin', 'array'):
            name = self._name(name)
        obj['name'] = name
        obj['meta-type'] = mtype
        self._jsons.append(obj)

    def _gen_member(self, member):
        ret = {'name': member.name, 'type': self._use_type(member.type)}
        if member.optional:
            ret['default'] = None
        return ret

    def _gen_variants(self, tag_name, variants):
        return {'tag': tag_name,
                'variants': [self._gen_variant(v) for v in variants]}

    def _gen_variant(self, variant):
        return {'case': variant.name, 'type': self._use_type(variant.type)}

    def visit_builtin_type(self, name, info, json_type):
        self._gen_json(name, 'builtin', {'json-type': json_type})

    def visit_enum_type(self, name, info, values, prefix):
        self._gen_json(name, 'enum', {'values': values})

    def visit_array_type(self, name, info, element_type):
        element = self._use_type(element_type)
        self._gen_json('[' + element + ']', 'array', {'element-type': element})

    def visit_object_type_flat(self, name, info, members, variants):
        obj = {'members': [self._gen_member(m) for m in members]}
        if variants:
            obj.update(self._gen_variants(variants.tag_member.name,
                                          variants.variants))
        self._gen_json(name, 'object', obj)

    def visit_alternate_type(self, name, info, variants):
        self._gen_json(name, 'alternate',
                       {'members': [{'type': self._use_type(m.type)}
                                    for m in variants.variants]})

    def visit_command(self, name, info, arg_type, ret_type,
                      gen, success_response, boxed):
        arg_type = arg_type or self._schema.the_empty_object_type
        ret_type = ret_type or self._schema.the_empty_object_type
        self._gen_json(name, 'command',
                       {'arg-type': self._use_type(arg_type),
                        'ret-type': self._use_type(ret_type)})

    def visit_event(self, name, info, arg_type, boxed):
        arg_type = arg_type or self._schema.the_empty_object_type
        self._gen_json(name, 'event', {'arg-type': self._use_type(arg_type)})

# Debugging aid: unmask QAPI schema's type names
# We normally mask them, because they're not QMP wire ABI
opt_unmask = False

(input_file, output_dir, do_c, do_h, prefix, opts) = \
    parse_command_line("u", ["unmask-non-abi-names"])

for o, a in opts:
    if o in ("-u", "--unmask-non-abi-names"):
        opt_unmask = True

c_comment = '''
/*
 * QAPI/QMP schema introspection
 *
 * Copyright (C) 2015 Red Hat, Inc.
 *
 * 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 = '''
/*
 * QAPI/QMP schema introspection
 *
 * Copyright (C) 2015 Red Hat, Inc.
 *
 * 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-introspect.c', 'qmp-introspect.h',
                            c_comment, h_comment)

fdef.write(mcgen('''
#include "qemu/osdep.h"
#include "%(prefix)sqmp-introspect.h"

''',
                 prefix=prefix))

schema = QAPISchema(input_file)
gen = QAPISchemaGenIntrospectVisitor(opt_unmask)
schema.visit(gen)
fdef.write(gen.defn)
fdecl.write(gen.decl)

close_output(fdef, fdecl)