qapi/qobject-input-visitor.c

   1 /*
   2  * Input Visitor
   3  *
   4  * Copyright (C) 2012-2017 Red Hat, Inc.
   5  * Copyright IBM, Corp. 2011
   6  *
   7  * Authors:
   8  *  Anthony Liguori   <aliguori@us.ibm.com>
   9  *
  10  * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
  11  * See the COPYING.LIB file in the top-level directory.
  12  *
  13  */
  14
  15 #include "qemu/osdep.h"
  16 #include "qapi/error.h"
  17 #include "qapi/qobject-input-visitor.h"
  18 #include "qapi/visitor-impl.h"
  19 #include "qemu/queue.h"
  20 #include "qemu-common.h"
  21 #include "qapi/qmp/qjson.h"
  22 #include "qapi/qmp/types.h"
  23 #include "qapi/qmp/qerror.h"
  24 #include "qemu/cutils.h"
  25 #include "qemu/option.h"
  26
  27 typedef struct StackObject {
  28     const char *name;            /* Name of @obj in its parent, if any */
  29     QObject *obj;                /* QDict or QList being visited */
  30     void *qapi; /* sanity check that caller uses same pointer */
  31
  32     GHashTable *h;              /* If @obj is QDict: unvisited keys */
  33     const QListEntry *entry;    /* If @obj is QList: unvisited tail */
  34     unsigned index;             /* If @obj is QList: list index of @entry */
  35
  36     QSLIST_ENTRY(StackObject) node; /* parent */
  37 } StackObject;
  38
  39 struct QObjectInputVisitor {
  40     Visitor visitor;
  41
  42     /* Root of visit at visitor creation. */
  43     QObject *root;
  44     bool keyval;                /* Assume @root made with keyval_parse() */
  45
  46     /* Stack of objects being visited (all entries will be either
  47      * QDict or QList). */
  48     QSLIST_HEAD(, StackObject) stack;
  49
  50     GString *errname;           /* Accumulator for full_name() */
  51 };
  52
  53 static QObjectInputVisitor *to_qiv(Visitor *v)
  54 {
  55     return container_of(v, QObjectInputVisitor, visitor);
  56 }
  57
  58 /*
  59  * Find the full name of something @qiv is currently visiting.
  60  * @qiv is visiting something named @name in the stack of containers
  61  * @qiv->stack.
  62  * If @n is zero, return its full name.
  63  * If @n is positive, return the full name of the @n-th container
  64  * counting from the top.  The stack of containers must have at least
  65  * @n elements.
  66  * The returned string is valid until the next full_name_nth(@v) or
  67  * destruction of @v.
  68  */
  69 static const char *full_name_nth(QObjectInputVisitor *qiv, const char *name,
  70                                  int n)
  71 {
  72     StackObject *so;
  73     char buf[32];
  74
  75     if (qiv->errname) {
  76         g_string_truncate(qiv->errname, 0);
  77     } else {
  78         qiv->errname = g_string_new("");
  79     }
  80
  81     QSLIST_FOREACH(so , &qiv->stack, node) {
  82         if (n) {
  83             n--;
  84         } else if (qobject_type(so->obj) == QTYPE_QDICT) {
  85             g_string_prepend(qiv->errname, name ?: "<anonymous>");
  86             g_string_prepend_c(qiv->errname, '.');
  87         } else {
  88             snprintf(buf, sizeof(buf),
  89                      qiv->keyval ? ".%u" : "[%u]",
  90                      so->index);
  91             g_string_prepend(qiv->errname, buf);
  92         }
  93         name = so->name;
  94     }
  95     assert(!n);
  96
  97     if (name) {
  98         g_string_prepend(qiv->errname, name);
  99     } else if (qiv->errname->str[0] == '.') {
 100         g_string_erase(qiv->errname, 0, 1);
 101     } else if (!qiv->errname->str[0]) {
 102         return "<anonymous>";
 103     }
 104
 105     return qiv->errname->str;
 106 }
 107
 108 static const char *full_name(QObjectInputVisitor *qiv, const char *name)
 109 {
 110     return full_name_nth(qiv, name, 0);
 111 }
 112
 113 static QObject *qobject_input_try_get_object(QObjectInputVisitor *qiv,
 114                                              const char *name,
 115                                              bool consume)
 116 {
 117     StackObject *tos;
 118     QObject *qobj;
 119     QObject *ret;
 120
 121     if (QSLIST_EMPTY(&qiv->stack)) {
 122         /* Starting at root, name is ignored. */
 123         assert(qiv->root);
 124         return qiv->root;
 125     }
 126
 127     /* We are in a container; find the next element. */
 128     tos = QSLIST_FIRST(&qiv->stack);
 129     qobj = tos->obj;
 130     assert(qobj);
 131
 132     if (qobject_type(qobj) == QTYPE_QDICT) {
 133         assert(name);
 134         ret = qdict_get(qobject_to_qdict(qobj), name);
 135         if (tos->h && consume && ret) {
 136             bool removed = g_hash_table_remove(tos->h, name);
 137             assert(removed);
 138         }
 139     } else {
 140         assert(qobject_type(qobj) == QTYPE_QLIST);
 141         assert(!name);
 142         if (tos->entry) {
 143             ret = qlist_entry_obj(tos->entry);
 144             if (consume) {
 145                 tos->entry = qlist_next(tos->entry);
 146             }
 147         } else {
 148             ret = NULL;
 149         }
 150         if (consume) {
 151             tos->index++;
 152         }
 153     }
 154
 155     return ret;
 156 }
 157
 158 static QObject *qobject_input_get_object(QObjectInputVisitor *qiv,
 159                                          const char *name,
 160                                          bool consume, Error **errp)
 161 {
 162     QObject *obj = qobject_input_try_get_object(qiv, name, consume);
 163
 164     if (!obj) {
 165         error_setg(errp, QERR_MISSING_PARAMETER, full_name(qiv, name));
 166     }
 167     return obj;
 168 }
 169
 170 static const char *qobject_input_get_keyval(QObjectInputVisitor *qiv,
 171                                             const char *name,
 172                                             Error **errp)
 173 {
 174     QObject *qobj;
 175     QString *qstr;
 176
 177     qobj = qobject_input_get_object(qiv, name, true, errp);
 178     if (!qobj) {
 179         return NULL;
 180     }
 181
 182     qstr = qobject_to_qstring(qobj);
 183     if (!qstr) {
 184         switch (qobject_type(qobj)) {
 185         case QTYPE_QDICT:
 186         case QTYPE_QLIST:
 187             error_setg(errp, "Parameters '%s.*' are unexpected",
 188                        full_name(qiv, name));
 189             return NULL;
 190         default:
 191             /* Non-string scalar (should this be an assertion?) */
 192             error_setg(errp, "Internal error: parameter %s invalid",
 193                        full_name(qiv, name));
 194             return NULL;
 195         }
 196     }
 197
 198     return qstring_get_str(qstr);
 199 }
 200
 201 static void qdict_add_key(const char *key, QObject *obj, void *opaque)
 202 {
 203     GHashTable *h = opaque;
 204     g_hash_table_insert(h, (gpointer) key, NULL);
 205 }
 206
 207 static const QListEntry *qobject_input_push(QObjectInputVisitor *qiv,
 208                                             const char *name,
 209                                             QObject *obj, void *qapi)
 210 {
 211     GHashTable *h;
 212     StackObject *tos = g_new0(StackObject, 1);
 213
 214     assert(obj);
 215     tos->name = name;
 216     tos->obj = obj;
 217     tos->qapi = qapi;
 218
 219     if (qobject_type(obj) == QTYPE_QDICT) {
 220         h = g_hash_table_new(g_str_hash, g_str_equal);
 221         qdict_iter(qobject_to_qdict(obj), qdict_add_key, h);
 222         tos->h = h;
 223     } else {
 224         assert(qobject_type(obj) == QTYPE_QLIST);
 225         tos->entry = qlist_first(qobject_to_qlist(obj));
 226         tos->index = -1;
 227     }
 228
 229     QSLIST_INSERT_HEAD(&qiv->stack, tos, node);
 230     return tos->entry;
 231 }
 232
 233
 234 static void qobject_input_check_struct(Visitor *v, Error **errp)
 235 {
 236     QObjectInputVisitor *qiv = to_qiv(v);
 237     StackObject *tos = QSLIST_FIRST(&qiv->stack);
 238     GHashTableIter iter;
 239     const char *key;
 240
 241     assert(tos && !tos->entry);
 242
 243     g_hash_table_iter_init(&iter, tos->h);
 244     if (g_hash_table_iter_next(&iter, (void **)&key, NULL)) {
 245         error_setg(errp, "Parameter '%s' is unexpected",
 246                    full_name(qiv, key));
 247     }
 248 }
 249
 250 static void qobject_input_stack_object_free(StackObject *tos)
 251 {
 252     if (tos->h) {
 253         g_hash_table_unref(tos->h);
 254     }
 255
 256     g_free(tos);
 257 }
 258
 259 static void qobject_input_pop(Visitor *v, void **obj)
 260 {
 261     QObjectInputVisitor *qiv = to_qiv(v);
 262     StackObject *tos = QSLIST_FIRST(&qiv->stack);
 263
 264     assert(tos && tos->qapi == obj);
 265     QSLIST_REMOVE_HEAD(&qiv->stack, node);
 266     qobject_input_stack_object_free(tos);
 267 }
 268
 269 static void qobject_input_start_struct(Visitor *v, const char *name, void **obj,
 270                                        size_t size, Error **errp)
 271 {
 272     QObjectInputVisitor *qiv = to_qiv(v);
 273     QObject *qobj = qobject_input_get_object(qiv, name, true, errp);
 274
 275     if (obj) {
 276         *obj = NULL;
 277     }
 278     if (!qobj) {
 279         return;
 280     }
 281     if (qobject_type(qobj) != QTYPE_QDICT) {
 282         error_setg(errp, QERR_INVALID_PARAMETER_TYPE,
 283                    full_name(qiv, name), "object");
 284         return;
 285     }
 286
 287     qobject_input_push(qiv, name, qobj, obj);
 288
 289     if (obj) {
 290         *obj = g_malloc0(size);
 291     }
 292 }
 293
 294
 295 static void qobject_input_start_list(Visitor *v, const char *name,
 296                                      GenericList **list, size_t size,
 297                                      Error **errp)
 298 {
 299     QObjectInputVisitor *qiv = to_qiv(v);
 300     QObject *qobj = qobject_input_get_object(qiv, name, true, errp);
 301     const QListEntry *entry;
 302
 303     if (list) {
 304         *list = NULL;
 305     }
 306     if (!qobj) {
 307         return;
 308     }
 309     if (qobject_type(qobj) != QTYPE_QLIST) {
 310         error_setg(errp, QERR_INVALID_PARAMETER_TYPE,
 311                    full_name(qiv, name), "array");
 312         return;
 313     }
 314
 315     entry = qobject_input_push(qiv, name, qobj, list);
 316     if (entry && list) {
 317         *list = g_malloc0(size);
 318     }
 319 }
 320
 321 static GenericList *qobject_input_next_list(Visitor *v, GenericList *tail,
 322                                             size_t size)
 323 {
 324     QObjectInputVisitor *qiv = to_qiv(v);
 325     StackObject *tos = QSLIST_FIRST(&qiv->stack);
 326
 327     assert(tos && tos->obj && qobject_type(tos->obj) == QTYPE_QLIST);
 328
 329     if (!tos->entry) {
 330         return NULL;
 331     }
 332     tail->next = g_malloc0(size);
 333     return tail->next;
 334 }
 335
 336 static void qobject_input_check_list(Visitor *v, Error **errp)
 337 {
 338     QObjectInputVisitor *qiv = to_qiv(v);
 339     StackObject *tos = QSLIST_FIRST(&qiv->stack);
 340
 341     assert(tos && tos->obj && qobject_type(tos->obj) == QTYPE_QLIST);
 342
 343     if (tos->entry) {
 344         error_setg(errp, "Only %u list elements expected in %s",
 345                    tos->index + 1, full_name_nth(qiv, NULL, 1));
 346     }
 347 }
 348
 349
 350 static void qobject_input_start_alternate(Visitor *v, const char *name,
 351                                           GenericAlternate **obj, size_t size,
 352                                           bool promote_int, Error **errp)
 353 {
 354     QObjectInputVisitor *qiv = to_qiv(v);
 355     QObject *qobj = qobject_input_get_object(qiv, name, false, errp);
 356
 357     if (!qobj) {
 358         *obj = NULL;
 359         return;
 360     }
 361     *obj = g_malloc0(size);
 362     (*obj)->type = qobject_type(qobj);
 363     if (promote_int && (*obj)->type == QTYPE_QINT) {
 364         (*obj)->type = QTYPE_QFLOAT;
 365     }
 366 }
 367
 368 static void qobject_input_type_int64(Visitor *v, const char *name, int64_t *obj,
 369                                      Error **errp)
 370 {
 371     QObjectInputVisitor *qiv = to_qiv(v);
 372     QObject *qobj = qobject_input_get_object(qiv, name, true, errp);
 373     QInt *qint;
 374
 375     if (!qobj) {
 376         return;
 377     }
 378     qint = qobject_to_qint(qobj);
 379     if (!qint) {
 380         error_setg(errp, QERR_INVALID_PARAMETER_TYPE,
 381                    full_name(qiv, name), "integer");
 382         return;
 383     }
 384
 385     *obj = qint_get_int(qint);
 386 }
 387
 388
 389 static void qobject_input_type_int64_keyval(Visitor *v, const char *name,
 390                                             int64_t *obj, Error **errp)
 391 {
 392     QObjectInputVisitor *qiv = to_qiv(v);
 393     const char *str = qobject_input_get_keyval(qiv, name, errp);
 394
 395     if (!str) {
 396         return;
 397     }
 398
 399     if (qemu_strtoi64(str, NULL, 0, obj) < 0) {
 400         /* TODO report -ERANGE more nicely */
 401         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
 402                    full_name(qiv, name), "integer");
 403     }
 404 }
 405
 406 static void qobject_input_type_uint64(Visitor *v, const char *name,
 407                                       uint64_t *obj, Error **errp)
 408 {
 409     /* FIXME: qobject_to_qint mishandles values over INT64_MAX */
 410     QObjectInputVisitor *qiv = to_qiv(v);
 411     QObject *qobj = qobject_input_get_object(qiv, name, true, errp);
 412     QInt *qint;
 413
 414     if (!qobj) {
 415         return;
 416     }
 417     qint = qobject_to_qint(qobj);
 418     if (!qint) {
 419         error_setg(errp, QERR_INVALID_PARAMETER_TYPE,
 420                    full_name(qiv, name), "integer");
 421         return;
 422     }
 423
 424     *obj = qint_get_int(qint);
 425 }
 426
 427 static void qobject_input_type_uint64_keyval(Visitor *v, const char *name,
 428                                              uint64_t *obj, Error **errp)
 429 {
 430     QObjectInputVisitor *qiv = to_qiv(v);
 431     const char *str = qobject_input_get_keyval(qiv, name, errp);
 432
 433     if (!str) {
 434         return;
 435     }
 436
 437     if (qemu_strtou64(str, NULL, 0, obj) < 0) {
 438         /* TODO report -ERANGE more nicely */
 439         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
 440                    full_name(qiv, name), "integer");
 441     }
 442 }
 443
 444 static void qobject_input_type_bool(Visitor *v, const char *name, bool *obj,
 445                                     Error **errp)
 446 {
 447     QObjectInputVisitor *qiv = to_qiv(v);
 448     QObject *qobj = qobject_input_get_object(qiv, name, true, errp);
 449     QBool *qbool;
 450
 451     if (!qobj) {
 452         return;
 453     }
 454     qbool = qobject_to_qbool(qobj);
 455     if (!qbool) {
 456         error_setg(errp, QERR_INVALID_PARAMETER_TYPE,
 457                    full_name(qiv, name), "boolean");
 458         return;
 459     }
 460
 461     *obj = qbool_get_bool(qbool);
 462 }
 463
 464 static void qobject_input_type_bool_keyval(Visitor *v, const char *name,
 465                                            bool *obj, Error **errp)
 466 {
 467     QObjectInputVisitor *qiv = to_qiv(v);
 468     const char *str = qobject_input_get_keyval(qiv, name, errp);
 469
 470     if (!str) {
 471         return;
 472     }
 473
 474     if (!strcmp(str, "on")) {
 475         *obj = true;
 476     } else if (!strcmp(str, "off")) {
 477         *obj = false;
 478     } else {
 479         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
 480                    full_name(qiv, name), "'on' or 'off'");
 481     }
 482 }
 483
 484 static void qobject_input_type_str(Visitor *v, const char *name, char **obj,
 485                                    Error **errp)
 486 {
 487     QObjectInputVisitor *qiv = to_qiv(v);
 488     QObject *qobj = qobject_input_get_object(qiv, name, true, errp);
 489     QString *qstr;
 490
 491     *obj = NULL;
 492     if (!qobj) {
 493         return;
 494     }
 495     qstr = qobject_to_qstring(qobj);
 496     if (!qstr) {
 497         error_setg(errp, QERR_INVALID_PARAMETER_TYPE,
 498                    full_name(qiv, name), "string");
 499         return;
 500     }
 501
 502     *obj = g_strdup(qstring_get_str(qstr));
 503 }
 504
 505 static void qobject_input_type_str_keyval(Visitor *v, const char *name,
 506                                           char **obj, Error **errp)
 507 {
 508     QObjectInputVisitor *qiv = to_qiv(v);
 509     const char *str = qobject_input_get_keyval(qiv, name, errp);
 510
 511     *obj = g_strdup(str);
 512 }
 513
 514 static void qobject_input_type_number(Visitor *v, const char *name, double *obj,
 515                                       Error **errp)
 516 {
 517     QObjectInputVisitor *qiv = to_qiv(v);
 518     QObject *qobj = qobject_input_get_object(qiv, name, true, errp);
 519     QInt *qint;
 520     QFloat *qfloat;
 521
 522     if (!qobj) {
 523         return;
 524     }
 525     qint = qobject_to_qint(qobj);
 526     if (qint) {
 527         *obj = qint_get_int(qobject_to_qint(qobj));
 528         return;
 529     }
 530
 531     qfloat = qobject_to_qfloat(qobj);
 532     if (qfloat) {
 533         *obj = qfloat_get_double(qobject_to_qfloat(qobj));
 534         return;
 535     }
 536
 537     error_setg(errp, QERR_INVALID_PARAMETER_TYPE,
 538                full_name(qiv, name), "number");
 539 }
 540
 541 static void qobject_input_type_number_keyval(Visitor *v, const char *name,
 542                                              double *obj, Error **errp)
 543 {
 544     QObjectInputVisitor *qiv = to_qiv(v);
 545     const char *str = qobject_input_get_keyval(qiv, name, errp);
 546     char *endp;
 547
 548     if (!str) {
 549         return;
 550     }
 551
 552     errno = 0;
 553     *obj = strtod(str, &endp);
 554     if (errno || endp == str || *endp) {
 555         /* TODO report -ERANGE more nicely */
 556         error_setg(errp, QERR_INVALID_PARAMETER_TYPE,
 557                    full_name(qiv, name), "number");
 558     }
 559 }
 560
 561 static void qobject_input_type_any(Visitor *v, const char *name, QObject **obj,
 562                                    Error **errp)
 563 {
 564     QObjectInputVisitor *qiv = to_qiv(v);
 565     QObject *qobj = qobject_input_get_object(qiv, name, true, errp);
 566
 567     *obj = NULL;
 568     if (!qobj) {
 569         return;
 570     }
 571
 572     qobject_incref(qobj);
 573     *obj = qobj;
 574 }
 575
 576 static void qobject_input_type_null(Visitor *v, const char *name, Error **errp)
 577 {
 578     QObjectInputVisitor *qiv = to_qiv(v);
 579     QObject *qobj = qobject_input_get_object(qiv, name, true, errp);
 580
 581     if (!qobj) {
 582         return;
 583     }
 584
 585     if (qobject_type(qobj) != QTYPE_QNULL) {
 586         error_setg(errp, QERR_INVALID_PARAMETER_TYPE,
 587                    full_name(qiv, name), "null");
 588     }
 589 }
 590
 591 static void qobject_input_type_size_keyval(Visitor *v, const char *name,
 592                                            uint64_t *obj, Error **errp)
 593 {
 594     QObjectInputVisitor *qiv = to_qiv(v);
 595     const char *str = qobject_input_get_keyval(qiv, name, errp);
 596
 597     if (!str) {
 598         return;
 599     }
 600
 601     if (qemu_strtosz(str, NULL, obj) < 0) {
 602         /* TODO report -ERANGE more nicely */
 603         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
 604                    full_name(qiv, name), "size");
 605     }
 606 }
 607
 608 static void qobject_input_optional(Visitor *v, const char *name, bool *present)
 609 {
 610     QObjectInputVisitor *qiv = to_qiv(v);
 611     QObject *qobj = qobject_input_try_get_object(qiv, name, false);
 612
 613     if (!qobj) {
 614         *present = false;
 615         return;
 616     }
 617
 618     *present = true;
 619 }
 620
 621 static void qobject_input_free(Visitor *v)
 622 {
 623     QObjectInputVisitor *qiv = to_qiv(v);
 624
 625     while (!QSLIST_EMPTY(&qiv->stack)) {
 626         StackObject *tos = QSLIST_FIRST(&qiv->stack);
 627
 628         QSLIST_REMOVE_HEAD(&qiv->stack, node);
 629         qobject_input_stack_object_free(tos);
 630     }
 631
 632     qobject_decref(qiv->root);
 633     if (qiv->errname) {
 634         g_string_free(qiv->errname, TRUE);
 635     }
 636     g_free(qiv);
 637 }
 638
 639 static QObjectInputVisitor *qobject_input_visitor_base_new(QObject *obj)
 640 {
 641     QObjectInputVisitor *v = g_malloc0(sizeof(*v));
 642
 643     assert(obj);
 644
 645     v->visitor.type = VISITOR_INPUT;
 646     v->visitor.start_struct = qobject_input_start_struct;
 647     v->visitor.check_struct = qobject_input_check_struct;
 648     v->visitor.end_struct = qobject_input_pop;
 649     v->visitor.start_list = qobject_input_start_list;
 650     v->visitor.next_list = qobject_input_next_list;
 651     v->visitor.check_list = qobject_input_check_list;
 652     v->visitor.end_list = qobject_input_pop;
 653     v->visitor.start_alternate = qobject_input_start_alternate;
 654     v->visitor.optional = qobject_input_optional;
 655     v->visitor.free = qobject_input_free;
 656
 657     v->root = obj;
 658     qobject_incref(obj);
 659
 660     return v;
 661 }
 662
 663 Visitor *qobject_input_visitor_new(QObject *obj)
 664 {
 665     QObjectInputVisitor *v = qobject_input_visitor_base_new(obj);
 666
 667     v->visitor.type_int64 = qobject_input_type_int64;
 668     v->visitor.type_uint64 = qobject_input_type_uint64;
 669     v->visitor.type_bool = qobject_input_type_bool;
 670     v->visitor.type_str = qobject_input_type_str;
 671     v->visitor.type_number = qobject_input_type_number;
 672     v->visitor.type_any = qobject_input_type_any;
 673     v->visitor.type_null = qobject_input_type_null;
 674
 675     return &v->visitor;
 676 }
 677
 678 Visitor *qobject_input_visitor_new_keyval(QObject *obj)
 679 {
 680     QObjectInputVisitor *v = qobject_input_visitor_base_new(obj);
 681
 682     v->visitor.type_int64 = qobject_input_type_int64_keyval;
 683     v->visitor.type_uint64 = qobject_input_type_uint64_keyval;
 684     v->visitor.type_bool = qobject_input_type_bool_keyval;
 685     v->visitor.type_str = qobject_input_type_str_keyval;
 686     v->visitor.type_number = qobject_input_type_number_keyval;
 687     v->visitor.type_any = qobject_input_type_any;
 688     v->visitor.type_null = qobject_input_type_null;
 689     v->visitor.type_size = qobject_input_type_size_keyval;
 690     v->keyval = true;
 691
 692     return &v->visitor;
 693 }
 694
 695 Visitor *qobject_input_visitor_new_str(const char *str,
 696                                        const char *implied_key,
 697                                        Error **errp)
 698 {
 699     bool is_json = str[0] == '{';
 700     QObject *obj;
 701     QDict *args;
 702     Visitor *v;
 703
 704     if (is_json) {
 705         obj = qobject_from_json(str, errp);
 706         if (!obj) {
 707             /* Work around qobject_from_json() lossage TODO fix that */
 708             if (errp && !*errp) {
 709                 error_setg(errp, "JSON parse error");
 710                 return NULL;
 711             }
 712             return NULL;
 713         }
 714         args = qobject_to_qdict(obj);
 715         assert(args);
 716         v = qobject_input_visitor_new(QOBJECT(args));
 717     } else {
 718         args = keyval_parse(str, implied_key, errp);
 719         if (!args) {
 720             return NULL;
 721         }
 722         v = qobject_input_visitor_new_keyval(QOBJECT(args));
 723     }
 724     QDECREF(args);
 725
 726     return v;
 727 }