xref: /qemu/scripts/qapi/visit.py (revision 6540e9f35bfeea2baf4509745516172070dca412) 
1#
2# QAPI visitor generator
3#
4# Copyright IBM, Corp. 2011
5# Copyright (C) 2014-2015 Red Hat, Inc.
6#
7# Authors:
8#  Anthony Liguori <aliguori@us.ibm.com>
9#  Michael Roth    <mdroth@linux.vnet.ibm.com>
10#  Markus Armbruster <armbru@redhat.com>
11#
12# This work is licensed under the terms of the GNU GPL, version 2.
13# See the COPYING file in the top-level directory.
14
15from ordereddict import OrderedDict
16from qapi import *
17import re
18import sys
19import os
20import getopt
21import errno
22
23implicit_structs = []
24
25def generate_visit_implicit_struct(type):
26    global implicit_structs
27    if type in implicit_structs:
28        return ''
29    implicit_structs.append(type)
30    return mcgen('''
31
32static void visit_type_implicit_%(c_type)s(Visitor *m, %(c_type)s **obj, Error **errp)
33{
34    Error *err = NULL;
35
36    visit_start_implicit_struct(m, (void **)obj, sizeof(%(c_type)s), &err);
37    if (!err) {
38        visit_type_%(c_type)s_fields(m, obj, errp);
39        visit_end_implicit_struct(m, &err);
40    }
41    error_propagate(errp, err);
42}
43''',
44                 c_type=type_name(type))
45
46def generate_visit_struct_fields(name, field_prefix, fn_prefix, members, base = None):
47    substructs = []
48    ret = ''
49    if not fn_prefix:
50        full_name = name
51    else:
52        full_name = "%s_%s" % (name, fn_prefix)
53
54    for argname, argentry, optional, structured in parse_args(members):
55        if structured:
56            if not fn_prefix:
57                nested_fn_prefix = argname
58            else:
59                nested_fn_prefix = "%s_%s" % (fn_prefix, argname)
60
61            nested_field_prefix = "%s%s." % (field_prefix, argname)
62            ret += generate_visit_struct_fields(name, nested_field_prefix,
63                                                nested_fn_prefix, argentry)
64            ret += mcgen('''
65
66static void visit_type_%(full_name)s_field_%(c_name)s(Visitor *m, %(name)s **obj, Error **errp)
67{
68''',
69                         name=name, full_name=full_name, c_name=c_var(argname))
70            ret += generate_visit_struct_body(full_name, argname, argentry)
71            ret += mcgen('''
72}
73''')
74
75    if base:
76        ret += generate_visit_implicit_struct(base)
77
78    ret += mcgen('''
79
80static void visit_type_%(full_name)s_fields(Visitor *m, %(name)s **obj, Error **errp)
81{
82    Error *err = NULL;
83''',
84        name=name, full_name=full_name)
85    push_indent()
86
87    if base:
88        ret += mcgen('''
89visit_type_implicit_%(type)s(m, &(*obj)->%(c_prefix)s%(c_name)s, &err);
90if (err) {
91    goto out;
92}
93''',
94                     c_prefix=c_var(field_prefix),
95                     type=type_name(base), c_name=c_var('base'))
96
97    for argname, argentry, optional, structured in parse_args(members):
98        if optional:
99            ret += mcgen('''
100visit_optional(m, &(*obj)->%(c_prefix)shas_%(c_name)s, "%(name)s", &err);
101if (!err && (*obj)->%(prefix)shas_%(c_name)s) {
102''',
103                         c_prefix=c_var(field_prefix), prefix=field_prefix,
104                         c_name=c_var(argname), name=argname)
105            push_indent()
106
107        if structured:
108            ret += mcgen('''
109visit_type_%(full_name)s_field_%(c_name)s(m, obj, &err);
110''',
111                         full_name=full_name, c_name=c_var(argname))
112        else:
113            ret += mcgen('''
114visit_type_%(type)s(m, &(*obj)->%(c_prefix)s%(c_name)s, "%(name)s", &err);
115''',
116                         c_prefix=c_var(field_prefix), prefix=field_prefix,
117                         type=type_name(argentry), c_name=c_var(argname),
118                         name=argname)
119
120        if optional:
121            pop_indent()
122            ret += mcgen('''
123}
124''')
125        ret += mcgen('''
126if (err) {
127    goto out;
128}
129''')
130
131    pop_indent()
132    if re.search('^ *goto out\\;', ret, re.MULTILINE):
133        ret += mcgen('''
134
135out:
136''')
137    ret += mcgen('''
138    error_propagate(errp, err);
139}
140''')
141    return ret
142
143
144def generate_visit_struct_body(field_prefix, name, members):
145    ret = mcgen('''
146    Error *err = NULL;
147
148''')
149
150    if not field_prefix:
151        full_name = name
152    else:
153        full_name = "%s_%s" % (field_prefix, name)
154
155    if len(field_prefix):
156        ret += mcgen('''
157    visit_start_struct(m, NULL, "", "%(name)s", 0, &err);
158''',
159                name=name)
160    else:
161        ret += mcgen('''
162    visit_start_struct(m, (void **)obj, "%(name)s", name, sizeof(%(name)s), &err);
163''',
164                name=name)
165
166    ret += mcgen('''
167    if (!err) {
168        if (*obj) {
169            visit_type_%(name)s_fields(m, obj, errp);
170        }
171        visit_end_struct(m, &err);
172    }
173    error_propagate(errp, err);
174''',
175        name=full_name)
176
177    return ret
178
179def generate_visit_struct(expr):
180
181    name = expr['type']
182    members = expr['data']
183    base = expr.get('base')
184
185    ret = generate_visit_struct_fields(name, "", "", members, base)
186
187    ret += mcgen('''
188
189void visit_type_%(name)s(Visitor *m, %(name)s **obj, const char *name, Error **errp)
190{
191''',
192                name=name)
193
194    ret += generate_visit_struct_body("", name, members)
195
196    ret += mcgen('''
197}
198''')
199    return ret
200
201def generate_visit_list(name, members):
202    return mcgen('''
203
204void visit_type_%(name)sList(Visitor *m, %(name)sList **obj, const char *name, Error **errp)
205{
206    Error *err = NULL;
207    GenericList *i, **prev;
208
209    visit_start_list(m, name, &err);
210    if (err) {
211        goto out;
212    }
213
214    for (prev = (GenericList **)obj;
215         !err && (i = visit_next_list(m, prev, &err)) != NULL;
216         prev = &i) {
217        %(name)sList *native_i = (%(name)sList *)i;
218        visit_type_%(name)s(m, &native_i->value, NULL, &err);
219    }
220
221    error_propagate(errp, err);
222    err = NULL;
223    visit_end_list(m, &err);
224out:
225    error_propagate(errp, err);
226}
227''',
228                name=name)
229
230def generate_visit_enum(name, members):
231    return mcgen('''
232
233void visit_type_%(name)s(Visitor *m, %(name)s *obj, const char *name, Error **errp)
234{
235    visit_type_enum(m, (int *)obj, %(name)s_lookup, "%(name)s", name, errp);
236}
237''',
238                 name=name)
239
240def generate_visit_anon_union(name, members):
241    ret = mcgen('''
242
243void visit_type_%(name)s(Visitor *m, %(name)s **obj, const char *name, Error **errp)
244{
245    Error *err = NULL;
246
247    visit_start_implicit_struct(m, (void**) obj, sizeof(%(name)s), &err);
248    if (err) {
249        goto out;
250    }
251    visit_get_next_type(m, (int*) &(*obj)->kind, %(name)s_qtypes, name, &err);
252    if (err) {
253        goto out_end;
254    }
255    switch ((*obj)->kind) {
256''',
257    name=name)
258
259    # For anon union, always use the default enum type automatically generated
260    # as "'%sKind' % (name)"
261    disc_type = '%sKind' % (name)
262
263    for key in members:
264        assert (members[key] in builtin_types
265            or find_struct(members[key])
266            or find_union(members[key])
267            or find_enum(members[key])), "Invalid anonymous union member"
268
269        enum_full_value = generate_enum_full_value(disc_type, key)
270        ret += mcgen('''
271    case %(enum_full_value)s:
272        visit_type_%(c_type)s(m, &(*obj)->%(c_name)s, name, &err);
273        break;
274''',
275                enum_full_value = enum_full_value,
276                c_type = type_name(members[key]),
277                c_name = c_fun(key))
278
279    ret += mcgen('''
280    default:
281        abort();
282    }
283out_end:
284    error_propagate(errp, err);
285    err = NULL;
286    visit_end_implicit_struct(m, &err);
287out:
288    error_propagate(errp, err);
289}
290''')
291
292    return ret
293
294
295def generate_visit_union(expr):
296
297    name = expr['union']
298    members = expr['data']
299
300    base = expr.get('base')
301    discriminator = expr.get('discriminator')
302
303    if discriminator == {}:
304        assert not base
305        return generate_visit_anon_union(name, members)
306
307    enum_define = discriminator_find_enum_define(expr)
308    if enum_define:
309        # Use the enum type as discriminator
310        ret = ""
311        disc_type = enum_define['enum_name']
312    else:
313        # There will always be a discriminator in the C switch code, by default it
314        # is an enum type generated silently as "'%sKind' % (name)"
315        ret = generate_visit_enum('%sKind' % name, members.keys())
316        disc_type = '%sKind' % (name)
317
318    if base:
319        base_fields = find_struct(base)['data']
320        if discriminator:
321            base_fields = base_fields.copy()
322            del base_fields[discriminator]
323        ret += generate_visit_struct_fields(name, "", "", base_fields)
324
325    if discriminator:
326        for key in members:
327            ret += generate_visit_implicit_struct(members[key])
328
329    ret += mcgen('''
330
331void visit_type_%(name)s(Visitor *m, %(name)s **obj, const char *name, Error **errp)
332{
333    Error *err = NULL;
334
335    visit_start_struct(m, (void **)obj, "%(name)s", name, sizeof(%(name)s), &err);
336    if (err) {
337        goto out;
338    }
339    if (*obj) {
340''',
341                 name=name)
342
343    if base:
344        ret += mcgen('''
345        visit_type_%(name)s_fields(m, obj, &err);
346        if (err) {
347            goto out_obj;
348        }
349''',
350            name=name)
351
352    if not discriminator:
353        disc_key = "type"
354    else:
355        disc_key = discriminator
356    ret += mcgen('''
357        visit_type_%(disc_type)s(m, &(*obj)->kind, "%(disc_key)s", &err);
358        if (err) {
359            goto out_obj;
360        }
361        if (!visit_start_union(m, !!(*obj)->data, &err) || err) {
362            goto out_obj;
363        }
364        switch ((*obj)->kind) {
365''',
366                 disc_type = disc_type,
367                 disc_key = disc_key)
368
369    for key in members:
370        if not discriminator:
371            fmt = 'visit_type_%(c_type)s(m, &(*obj)->%(c_name)s, "data", &err);'
372        else:
373            fmt = 'visit_type_implicit_%(c_type)s(m, &(*obj)->%(c_name)s, &err);'
374
375        enum_full_value = generate_enum_full_value(disc_type, key)
376        ret += mcgen('''
377        case %(enum_full_value)s:
378            ''' + fmt + '''
379            break;
380''',
381                enum_full_value = enum_full_value,
382                c_type=type_name(members[key]),
383                c_name=c_fun(key))
384
385    ret += mcgen('''
386        default:
387            abort();
388        }
389out_obj:
390        error_propagate(errp, err);
391        err = NULL;
392        visit_end_union(m, !!(*obj)->data, &err);
393        error_propagate(errp, err);
394        err = NULL;
395    }
396    visit_end_struct(m, &err);
397out:
398    error_propagate(errp, err);
399}
400''')
401
402    return ret
403
404def generate_declaration(name, members, builtin_type=False):
405    ret = ""
406    if not builtin_type:
407        ret += mcgen('''
408
409void visit_type_%(name)s(Visitor *m, %(name)s **obj, const char *name, Error **errp);
410''',
411                     name=name)
412
413    ret += mcgen('''
414void visit_type_%(name)sList(Visitor *m, %(name)sList **obj, const char *name, Error **errp);
415''',
416                 name=name)
417
418    return ret
419
420def generate_enum_declaration(name, members):
421    ret = mcgen('''
422void visit_type_%(name)sList(Visitor *m, %(name)sList **obj, const char *name, Error **errp);
423''',
424                name=name)
425
426    return ret
427
428def generate_decl_enum(name, members):
429    return mcgen('''
430
431void visit_type_%(name)s(Visitor *m, %(name)s *obj, const char *name, Error **errp);
432''',
433                name=name)
434
435try:
436    opts, args = getopt.gnu_getopt(sys.argv[1:], "chbp:i:o:",
437                                   ["source", "header", "builtins", "prefix=",
438                                    "input-file=", "output-dir="])
439except getopt.GetoptError, err:
440    print str(err)
441    sys.exit(1)
442
443input_file = ""
444output_dir = ""
445prefix = ""
446c_file = 'qapi-visit.c'
447h_file = 'qapi-visit.h'
448
449do_c = False
450do_h = False
451do_builtins = False
452
453for o, a in opts:
454    if o in ("-p", "--prefix"):
455        prefix = a
456    elif o in ("-i", "--input-file"):
457        input_file = a
458    elif o in ("-o", "--output-dir"):
459        output_dir = a + "/"
460    elif o in ("-c", "--source"):
461        do_c = True
462    elif o in ("-h", "--header"):
463        do_h = True
464    elif o in ("-b", "--builtins"):
465        do_builtins = True
466
467if not do_c and not do_h:
468    do_c = True
469    do_h = True
470
471c_file = output_dir + prefix + c_file
472h_file = output_dir + prefix + h_file
473
474try:
475    os.makedirs(output_dir)
476except os.error, e:
477    if e.errno != errno.EEXIST:
478        raise
479
480def maybe_open(really, name, opt):
481    if really:
482        return open(name, opt)
483    else:
484        import StringIO
485        return StringIO.StringIO()
486
487fdef = maybe_open(do_c, c_file, 'w')
488fdecl = maybe_open(do_h, h_file, 'w')
489
490fdef.write(mcgen('''
491/* THIS FILE IS AUTOMATICALLY GENERATED, DO NOT MODIFY */
492
493/*
494 * schema-defined QAPI visitor functions
495 *
496 * Copyright IBM, Corp. 2011
497 *
498 * Authors:
499 *  Anthony Liguori   <aliguori@us.ibm.com>
500 *
501 * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
502 * See the COPYING.LIB file in the top-level directory.
503 *
504 */
505
506#include "qemu-common.h"
507#include "%(header)s"
508''',
509                 header=basename(h_file)))
510
511fdecl.write(mcgen('''
512/* THIS FILE IS AUTOMATICALLY GENERATED, DO NOT MODIFY */
513
514/*
515 * schema-defined QAPI visitor functions
516 *
517 * Copyright IBM, Corp. 2011
518 *
519 * Authors:
520 *  Anthony Liguori   <aliguori@us.ibm.com>
521 *
522 * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
523 * See the COPYING.LIB file in the top-level directory.
524 *
525 */
526
527#ifndef %(guard)s
528#define %(guard)s
529
530#include "qapi/visitor.h"
531#include "%(prefix)sqapi-types.h"
532
533''',
534                  prefix=prefix, guard=guardname(h_file)))
535
536exprs = parse_schema(input_file)
537
538# to avoid header dependency hell, we always generate declarations
539# for built-in types in our header files and simply guard them
540fdecl.write(guardstart("QAPI_VISIT_BUILTIN_VISITOR_DECL"))
541for typename in builtin_types:
542    fdecl.write(generate_declaration(typename, None, builtin_type=True))
543fdecl.write(guardend("QAPI_VISIT_BUILTIN_VISITOR_DECL"))
544
545# ...this doesn't work for cases where we link in multiple objects that
546# have the functions defined, so we use -b option to provide control
547# over these cases
548if do_builtins:
549    for typename in builtin_types:
550        fdef.write(generate_visit_list(typename, None))
551
552for expr in exprs:
553    if expr.has_key('type'):
554        ret = generate_visit_struct(expr)
555        ret += generate_visit_list(expr['type'], expr['data'])
556        fdef.write(ret)
557
558        ret = generate_declaration(expr['type'], expr['data'])
559        fdecl.write(ret)
560    elif expr.has_key('union'):
561        ret = generate_visit_union(expr)
562        ret += generate_visit_list(expr['union'], expr['data'])
563        fdef.write(ret)
564
565        enum_define = discriminator_find_enum_define(expr)
566        ret = ""
567        if not enum_define:
568            ret = generate_decl_enum('%sKind' % expr['union'],
569                                     expr['data'].keys())
570        ret += generate_declaration(expr['union'], expr['data'])
571        fdecl.write(ret)
572    elif expr.has_key('enum'):
573        ret = generate_visit_list(expr['enum'], expr['data'])
574        ret += generate_visit_enum(expr['enum'], expr['data'])
575        fdef.write(ret)
576
577        ret = generate_decl_enum(expr['enum'], expr['data'])
578        ret += generate_enum_declaration(expr['enum'], expr['data'])
579        fdecl.write(ret)
580
581fdecl.write('''
582#endif
583''')
584
585fdecl.flush()
586fdecl.close()
587
588fdef.flush()
589fdef.close()
590