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 <math.h>
  17 #include "qapi/error.h"
  18 #include "qapi/qobject-input-visitor.h"
  19 #include "qapi/visitor-impl.h"
  20 #include "qemu/queue.h"
  21 #include "qapi/qmp/qjson.h"
  22 #include "qapi/qmp/qbool.h"
  23 #include "qapi/qmp/qdict.h"
  24 #include "qapi/qmp/qerror.h"
  25 #include "qapi/qmp/qlist.h"
  26 #include "qapi/qmp/qnull.h"
  27 #include "qapi/qmp/qnum.h"
  28 #include "qapi/qmp/qstring.h"
  29 #include "qemu/cutils.h"
  30 #include "qemu/option.h"
  31
  32 typedef struct StackObject {
  33     const char *name;            /* Name of @obj in its parent, if any */
  34     QObject *obj;                /* QDict or QList being visited */
  35     void *qapi; /* sanity check that caller uses same pointer */
  36
  37     GHashTable *h;              /* If @obj is QDict: unvisited keys */
  38     const QListEntry *entry;    /* If @obj is QList: unvisited tail */
  39     unsigned index;             /* If @obj is QList: list index of @entry */
  40
  41     QSLIST_ENTRY(StackObject) node; /* parent */
  42 } StackObject;
  43
  44 struct QObjectInputVisitor {
  45     Visitor visitor;
  46
  47     /* Root of visit at visitor creation. */
  48     QObject *root;
  49     bool keyval;                /* Assume @root made with keyval_parse() */
  50
  51     /* Stack of objects being visited (all entries will be either
  52      * QDict or QList). */
  53     QSLIST_HEAD(, StackObject) stack;
  54
  55     GString *errname;           /* Accumulator for full_name() */
  56 };
  57
  58 static QObjectInputVisitor *to_qiv(Visitor *v)
  59 {
  60     return container_of(v, QObjectInputVisitor, visitor);
  61 }
  62
  63 /*
  64  * Find the full name of something @qiv is currently visiting.
  65  * @qiv is visiting something named @name in the stack of containers
  66  * @qiv->stack.
  67  * If @n is zero, return its full name.
  68  * If @n is positive, return the full name of the @n-th container
  69  * counting from the top.  The stack of containers must have at least
  70  * @n elements.
  71  * The returned string is valid until the next full_name_nth(@v) or
  72  * destruction of @v.
  73  */
  74 static const char *full_name_nth(QObjectInputVisitor *qiv, const char *name,
  75                                  int n)
  76 {
  77     StackObject *so;
  78     char buf[32];
  79
  80     if (qiv->errname) {
  81         g_string_truncate(qiv->errname, 0);
  82     } else {
  83         qiv->errname = g_string_new("");
  84     }
  85
  86     QSLIST_FOREACH(so , &qiv->stack, node) {
  87         if (n) {
  88             n--;
  89         } else if (qobject_type(so->obj) == QTYPE_QDICT) {
  90             g_string_prepend(qiv->errname, name ?: "<anonymous>");
  91             g_string_prepend_c(qiv->errname, '.');
  92         } else {
  93             snprintf(buf, sizeof(buf),
  94                      qiv->keyval ? ".%u" : "[%u]",
  95                      so->index);
  96             g_string_prepend(qiv->errname, buf);
  97         }
  98         name = so->name;
  99     }
 100     assert(!n);
 101
 102     if (name) {
 103         g_string_prepend(qiv->errname, name);
 104     } else if (qiv->errname->str[0] == '.') {
 105         g_string_erase(qiv->errname, 0, 1);
 106     } else if (!qiv->errname->str[0]) {
 107         return "<anonymous>";
 108     }
 109
 110     return qiv->errname->str;
 111 }
 112
 113 static const char *full_name(QObjectInputVisitor *qiv, const char *name)
 114 {
 115     return full_name_nth(qiv, name, 0);
 116 }
 117
 118 static QObject *qobject_input_try_get_object(QObjectInputVisitor *qiv,
 119                                              const char *name,
 120                                              bool consume)
 121 {
 122     StackObject *tos;
 123     QObject *qobj;
 124     QObject *ret;
 125
 126     if (QSLIST_EMPTY(&qiv->stack)) {
 127         /* Starting at root, name is ignored. */
 128         assert(qiv->root);
 129         return qiv->root;
 130     }
 131
 132     /* We are in a container; find the next element. */
 133     tos = QSLIST_FIRST(&qiv->stack);
 134     qobj = tos->obj;
 135     assert(qobj);
 136
 137     if (qobject_type(qobj) == QTYPE_QDICT) {
 138         assert(name);
 139         ret = qdict_get(qobject_to(QDict, qobj), name);
 140         if (tos->h && consume && ret) {
 141             bool removed = g_hash_table_remove(tos->h, name);
 142             assert(removed);
 143         }
 144     } else {
 145         assert(qobject_type(qobj) == QTYPE_QLIST);
 146         assert(!name);
 147         if (tos->entry) {
 148             ret = qlist_entry_obj(tos->entry);
 149             if (consume) {
 150                 tos->entry = qlist_next(tos->entry);
 151             }
 152         } else {
 153             ret = NULL;
 154         }
 155         if (consume) {
 156             tos->index++;
 157         }
 158     }
 159
 160     return ret;
 161 }
 162
 163 static QObject *qobject_input_get_object(QObjectInputVisitor *qiv,
 164                                          const char *name,
 165                                          bool consume, Error **errp)
 166 {
 167     QObject *obj = qobject_input_try_get_object(qiv, name, consume);
 168
 169     if (!obj) {
 170         error_setg(errp, QERR_MISSING_PARAMETER, full_name(qiv, name));
 171     }
 172     return obj;
 173 }
 174
 175 static const char *qobject_input_get_keyval(QObjectInputVisitor *qiv,
 176                                             const char *name,
 177                                             Error **errp)
 178 {
 179     QObject *qobj;
 180     QString *qstr;
 181
 182     qobj = qobject_input_get_object(qiv, name, true, errp);
 183     if (!qobj) {
 184         return NULL;
 185     }
 186
 187     qstr = qobject_to(QString, qobj);
 188     if (!qstr) {
 189         switch (qobject_type(qobj)) {
 190         case QTYPE_QDICT:
 191         case QTYPE_QLIST:
 192             error_setg(errp, "Parameters '%s.*' are unexpected",
 193                        full_name(qiv, name));
 194             return NULL;
 195         default:
 196             /* Non-string scalar (should this be an assertion?) */
 197             error_setg(errp, "Internal error: parameter %s invalid",
 198                        full_name(qiv, name));
 199             return NULL;
 200         }
 201     }
 202
 203     return qstring_get_str(qstr);
 204 }
 205
 206 static void qdict_add_key(const char *key, QObject *obj, void *opaque)
 207 {
 208     GHashTable *h = opaque;
 209     g_hash_table_insert(h, (gpointer) key, NULL);
 210 }
 211
 212 static const QListEntry *qobject_input_push(QObjectInputVisitor *qiv,
 213                                             const char *name,
 214                                             QObject *obj, void *qapi)
 215 {
 216     GHashTable *h;
 217     StackObject *tos = g_new0(StackObject, 1);
 218
 219     assert(obj);
 220     tos->name = name;
 221     tos->obj = obj;
 222     tos->qapi = qapi;
 223
 224     if (qobject_type(obj) == QTYPE_QDICT) {
 225         h = g_hash_table_new(g_str_hash, g_str_equal);
 226         qdict_iter(qobject_to(QDict, obj), qdict_add_key, h);
 227         tos->h = h;
 228     } else {
 229         assert(qobject_type(obj) == QTYPE_QLIST);
 230         tos->entry = qlist_first(qobject_to(QList, obj));
 231         tos->index = -1;
 232     }
 233
 234     QSLIST_INSERT_HEAD(&qiv->stack, tos, node);
 235     return tos->entry;
 236 }
 237
 238
 239 static void qobject_input_check_struct(Visitor *v, Error **errp)
 240 {
 241     QObjectInputVisitor *qiv = to_qiv(v);
 242     StackObject *tos = QSLIST_FIRST(&qiv->stack);
 243     GHashTableIter iter;
 244     const char *key;
 245
 246     assert(tos && !tos->entry);
 247
 248     g_hash_table_iter_init(&iter, tos->h);
 249     if (g_hash_table_iter_next(&iter, (void **)&key, NULL)) {
 250         error_setg(errp, "Parameter '%s' is unexpected",
 251                    full_name(qiv, key));
 252     }
 253 }
 254
 255 static void qobject_input_stack_object_free(StackObject *tos)
 256 {
 257     if (tos->h) {
 258         g_hash_table_unref(tos->h);
 259     }
 260
 261     g_free(tos);
 262 }
 263
 264 static void qobject_input_pop(Visitor *v, void **obj)
 265 {
 266     QObjectInputVisitor *qiv = to_qiv(v);
 267     StackObject *tos = QSLIST_FIRST(&qiv->stack);
 268
 269     assert(tos && tos->qapi == obj);
 270     QSLIST_REMOVE_HEAD(&qiv->stack, node);
 271     qobject_input_stack_object_free(tos);
 272 }
 273
 274 static void qobject_input_start_struct(Visitor *v, const char *name, void **obj,
 275                                        size_t size, Error **errp)
 276 {
 277     QObjectInputVisitor *qiv = to_qiv(v);
 278     QObject *qobj = qobject_input_get_object(qiv, name, true, errp);
 279
 280     if (obj) {
 281         *obj = NULL;
 282     }
 283     if (!qobj) {
 284         return;
 285     }
 286     if (qobject_type(qobj) != QTYPE_QDICT) {
 287         error_setg(errp, QERR_INVALID_PARAMETER_TYPE,
 288                    full_name(qiv, name), "object");
 289         return;
 290     }
 291
 292     qobject_input_push(qiv, name, qobj, obj);
 293
 294     if (obj) {
 295         *obj = g_malloc0(size);
 296     }
 297 }
 298
 299 static void qobject_input_end_struct(Visitor *v, void **obj)
 300 {
 301     QObjectInputVisitor *qiv = to_qiv(v);
 302     StackObject *tos = QSLIST_FIRST(&qiv->stack);
 303
 304     assert(qobject_type(tos->obj) == QTYPE_QDICT && tos->h);
 305     qobject_input_pop(v, obj);
 306 }
 307
 308
 309 static void qobject_input_start_list(Visitor *v, const char *name,
 310                                      GenericList **list, size_t size,
 311                                      Error **errp)
 312 {
 313     QObjectInputVisitor *qiv = to_qiv(v);
 314     QObject *qobj = qobject_input_get_object(qiv, name, true, errp);
 315     const QListEntry *entry;
 316
 317     if (list) {
 318         *list = NULL;
 319     }
 320     if (!qobj) {
 321         return;
 322     }
 323     if (qobject_type(qobj) != QTYPE_QLIST) {
 324         error_setg(errp, QERR_INVALID_PARAMETER_TYPE,
 325                    full_name(qiv, name), "array");
 326         return;
 327     }
 328
 329     entry = qobject_input_push(qiv, name, qobj, list);
 330     if (entry && list) {
 331         *list = g_malloc0(size);
 332     }
 333 }
 334
 335 static GenericList *qobject_input_next_list(Visitor *v, GenericList *tail,
 336                                             size_t size)
 337 {
 338     QObjectInputVisitor *qiv = to_qiv(v);
 339     StackObject *tos = QSLIST_FIRST(&qiv->stack);
 340
 341     assert(tos && qobject_to(QList, tos->obj));
 342
 343     if (!tos->entry) {
 344         return NULL;
 345     }
 346     tail->next = g_malloc0(size);
 347     return tail->next;
 348 }
 349
 350 static void qobject_input_check_list(Visitor *v, Error **errp)
 351 {
 352     QObjectInputVisitor *qiv = to_qiv(v);
 353     StackObject *tos = QSLIST_FIRST(&qiv->stack);
 354
 355     assert(tos && qobject_to(QList, tos->obj));
 356
 357     if (tos->entry) {
 358         error_setg(errp, "Only %u list elements expected in %s",
 359                    tos->index + 1, full_name_nth(qiv, NULL, 1));
 360     }
 361 }
 362
 363 static void qobject_input_end_list(Visitor *v, void **obj)
 364 {
 365     QObjectInputVisitor *qiv = to_qiv(v);
 366     StackObject *tos = QSLIST_FIRST(&qiv->stack);
 367
 368     assert(qobject_type(tos->obj) == QTYPE_QLIST && !tos->h);
 369     qobject_input_pop(v, obj);
 370 }
 371
 372 static void qobject_input_start_alternate(Visitor *v, const char *name,
 373                                           GenericAlternate **obj, size_t size,
 374                                           Error **errp)
 375 {
 376     QObjectInputVisitor *qiv = to_qiv(v);
 377     QObject *qobj = qobject_input_get_object(qiv, name, false, errp);
 378
 379     if (!qobj) {
 380         *obj = NULL;
 381         return;
 382     }
 383     *obj = g_malloc0(size);
 384     (*obj)->type = qobject_type(qobj);
 385 }
 386
 387 static void qobject_input_type_int64(Visitor *v, const char *name, int64_t *obj,
 388                                      Error **errp)
 389 {
 390     QObjectInputVisitor *qiv = to_qiv(v);
 391     QObject *qobj = qobject_input_get_object(qiv, name, true, errp);
 392     QNum *qnum;
 393
 394     if (!qobj) {
 395         return;
 396     }
 397     qnum = qobject_to(QNum, qobj);
 398     if (!qnum || !qnum_get_try_int(qnum, obj)) {
 399         error_setg(errp, QERR_INVALID_PARAMETER_TYPE,
 400                    full_name(qiv, name), "integer");
 401     }
 402 }
 403
 404 static void qobject_input_type_int64_keyval(Visitor *v, const char *name,
 405                                             int64_t *obj, Error **errp)
 406 {
 407     QObjectInputVisitor *qiv = to_qiv(v);
 408     const char *str = qobject_input_get_keyval(qiv, name, errp);
 409
 410     if (!str) {
 411         return;
 412     }
 413
 414     if (qemu_strtoi64(str, NULL, 0, obj) < 0) {
 415         /* TODO report -ERANGE more nicely */
 416         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
 417                    full_name(qiv, name), "integer");
 418     }
 419 }
 420
 421 static void qobject_input_type_uint64(Visitor *v, const char *name,
 422                                       uint64_t *obj, Error **errp)
 423 {
 424     QObjectInputVisitor *qiv = to_qiv(v);
 425     QObject *qobj = qobject_input_get_object(qiv, name, true, errp);
 426     QNum *qnum;
 427     int64_t val;
 428
 429     if (!qobj) {
 430         return;
 431     }
 432     qnum = qobject_to(QNum, qobj);
 433     if (!qnum) {
 434         goto err;
 435     }
 436
 437     if (qnum_get_try_uint(qnum, obj)) {
 438         return;
 439     }
 440
 441     /* Need to accept negative values for backward compatibility */
 442     if (qnum_get_try_int(qnum, &val)) {
 443         *obj = val;
 444         return;
 445     }
 446
 447 err:
 448     error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
 449                full_name(qiv, name), "uint64");
 450 }
 451
 452 static void qobject_input_type_uint64_keyval(Visitor *v, const char *name,
 453                                              uint64_t *obj, Error **errp)
 454 {
 455     QObjectInputVisitor *qiv = to_qiv(v);
 456     const char *str = qobject_input_get_keyval(qiv, name, errp);
 457
 458     if (!str) {
 459         return;
 460     }
 461
 462     if (qemu_strtou64(str, NULL, 0, obj) < 0) {
 463         /* TODO report -ERANGE more nicely */
 464         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
 465                    full_name(qiv, name), "integer");
 466     }
 467 }
 468
 469 static void qobject_input_type_bool(Visitor *v, const char *name, bool *obj,
 470                                     Error **errp)
 471 {
 472     QObjectInputVisitor *qiv = to_qiv(v);
 473     QObject *qobj = qobject_input_get_object(qiv, name, true, errp);
 474     QBool *qbool;
 475
 476     if (!qobj) {
 477         return;
 478     }
 479     qbool = qobject_to(QBool, qobj);
 480     if (!qbool) {
 481         error_setg(errp, QERR_INVALID_PARAMETER_TYPE,
 482                    full_name(qiv, name), "boolean");
 483         return;
 484     }
 485
 486     *obj = qbool_get_bool(qbool);
 487 }
 488
 489 static void qobject_input_type_bool_keyval(Visitor *v, const char *name,
 490                                            bool *obj, Error **errp)
 491 {
 492     QObjectInputVisitor *qiv = to_qiv(v);
 493     const char *str = qobject_input_get_keyval(qiv, name, errp);
 494
 495     if (!str) {
 496         return;
 497     }
 498
 499     if (!strcmp(str, "on")) {
 500         *obj = true;
 501     } else if (!strcmp(str, "off")) {
 502         *obj = false;
 503     } else {
 504         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
 505                    full_name(qiv, name), "'on' or 'off'");
 506     }
 507 }
 508
 509 static void qobject_input_type_str(Visitor *v, const char *name, char **obj,
 510                                    Error **errp)
 511 {
 512     QObjectInputVisitor *qiv = to_qiv(v);
 513     QObject *qobj = qobject_input_get_object(qiv, name, true, errp);
 514     QString *qstr;
 515
 516     *obj = NULL;
 517     if (!qobj) {
 518         return;
 519     }
 520     qstr = qobject_to(QString, qobj);
 521     if (!qstr) {
 522         error_setg(errp, QERR_INVALID_PARAMETER_TYPE,
 523                    full_name(qiv, name), "string");
 524         return;
 525     }
 526
 527     *obj = g_strdup(qstring_get_str(qstr));
 528 }
 529
 530 static void qobject_input_type_str_keyval(Visitor *v, const char *name,
 531                                           char **obj, Error **errp)
 532 {
 533     QObjectInputVisitor *qiv = to_qiv(v);
 534     const char *str = qobject_input_get_keyval(qiv, name, errp);
 535
 536     *obj = g_strdup(str);
 537 }
 538
 539 static void qobject_input_type_number(Visitor *v, const char *name, double *obj,
 540                                       Error **errp)
 541 {
 542     QObjectInputVisitor *qiv = to_qiv(v);
 543     QObject *qobj = qobject_input_get_object(qiv, name, true, errp);
 544     QNum *qnum;
 545
 546     if (!qobj) {
 547         return;
 548     }
 549     qnum = qobject_to(QNum, qobj);
 550     if (!qnum) {
 551         error_setg(errp, QERR_INVALID_PARAMETER_TYPE,
 552                    full_name(qiv, name), "number");
 553         return;
 554     }
 555
 556     *obj = qnum_get_double(qnum);
 557 }
 558
 559 static void qobject_input_type_number_keyval(Visitor *v, const char *name,
 560                                              double *obj, Error **errp)
 561 {
 562     QObjectInputVisitor *qiv = to_qiv(v);
 563     const char *str = qobject_input_get_keyval(qiv, name, errp);
 564     double val;
 565
 566     if (!str) {
 567         return;
 568     }
 569
 570     if (qemu_strtod_finite(str, NULL, &val)) {
 571         /* TODO report -ERANGE more nicely */
 572         error_setg(errp, QERR_INVALID_PARAMETER_TYPE,
 573                    full_name(qiv, name), "number");
 574         return;
 575     }
 576
 577     *obj = val;
 578 }
 579
 580 static void qobject_input_type_any(Visitor *v, const char *name, QObject **obj,
 581                                    Error **errp)
 582 {
 583     QObjectInputVisitor *qiv = to_qiv(v);
 584     QObject *qobj = qobject_input_get_object(qiv, name, true, errp);
 585
 586     *obj = NULL;
 587     if (!qobj) {
 588         return;
 589     }
 590
 591     *obj = qobject_ref(qobj);
 592 }
 593
 594 static void qobject_input_type_null(Visitor *v, const char *name,
 595                                     QNull **obj, Error **errp)
 596 {
 597     QObjectInputVisitor *qiv = to_qiv(v);
 598     QObject *qobj = qobject_input_get_object(qiv, name, true, errp);
 599
 600     *obj = NULL;
 601     if (!qobj) {
 602         return;
 603     }
 604
 605     if (qobject_type(qobj) != QTYPE_QNULL) {
 606         error_setg(errp, QERR_INVALID_PARAMETER_TYPE,
 607                    full_name(qiv, name), "null");
 608         return;
 609     }
 610     *obj = qnull();
 611 }
 612
 613 static void qobject_input_type_size_keyval(Visitor *v, const char *name,
 614                                            uint64_t *obj, Error **errp)
 615 {
 616     QObjectInputVisitor *qiv = to_qiv(v);
 617     const char *str = qobject_input_get_keyval(qiv, name, errp);
 618
 619     if (!str) {
 620         return;
 621     }
 622
 623     if (qemu_strtosz(str, NULL, obj) < 0) {
 624         /* TODO report -ERANGE more nicely */
 625         error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
 626                    full_name(qiv, name), "size");
 627     }
 628 }
 629
 630 static void qobject_input_optional(Visitor *v, const char *name, bool *present)
 631 {
 632     QObjectInputVisitor *qiv = to_qiv(v);
 633     QObject *qobj = qobject_input_try_get_object(qiv, name, false);
 634
 635     if (!qobj) {
 636         *present = false;
 637         return;
 638     }
 639
 640     *present = true;
 641 }
 642
 643 static void qobject_input_free(Visitor *v)
 644 {
 645     QObjectInputVisitor *qiv = to_qiv(v);
 646
 647     while (!QSLIST_EMPTY(&qiv->stack)) {
 648         StackObject *tos = QSLIST_FIRST(&qiv->stack);
 649
 650         QSLIST_REMOVE_HEAD(&qiv->stack, node);
 651         qobject_input_stack_object_free(tos);
 652     }
 653
 654     qobject_unref(qiv->root);
 655     if (qiv->errname) {
 656         g_string_free(qiv->errname, TRUE);
 657     }
 658     g_free(qiv);
 659 }
 660
 661 static QObjectInputVisitor *qobject_input_visitor_base_new(QObject *obj)
 662 {
 663     QObjectInputVisitor *v = g_malloc0(sizeof(*v));
 664
 665     assert(obj);
 666
 667     v->visitor.type = VISITOR_INPUT;
 668     v->visitor.start_struct = qobject_input_start_struct;
 669     v->visitor.check_struct = qobject_input_check_struct;
 670     v->visitor.end_struct = qobject_input_end_struct;
 671     v->visitor.start_list = qobject_input_start_list;
 672     v->visitor.next_list = qobject_input_next_list;
 673     v->visitor.check_list = qobject_input_check_list;
 674     v->visitor.end_list = qobject_input_end_list;
 675     v->visitor.start_alternate = qobject_input_start_alternate;
 676     v->visitor.optional = qobject_input_optional;
 677     v->visitor.free = qobject_input_free;
 678
 679     v->root = qobject_ref(obj);
 680
 681     return v;
 682 }
 683
 684 Visitor *qobject_input_visitor_new(QObject *obj)
 685 {
 686     QObjectInputVisitor *v = qobject_input_visitor_base_new(obj);
 687
 688     v->visitor.type_int64 = qobject_input_type_int64;
 689     v->visitor.type_uint64 = qobject_input_type_uint64;
 690     v->visitor.type_bool = qobject_input_type_bool;
 691     v->visitor.type_str = qobject_input_type_str;
 692     v->visitor.type_number = qobject_input_type_number;
 693     v->visitor.type_any = qobject_input_type_any;
 694     v->visitor.type_null = qobject_input_type_null;
 695
 696     return &v->visitor;
 697 }
 698
 699 Visitor *qobject_input_visitor_new_keyval(QObject *obj)
 700 {
 701     QObjectInputVisitor *v = qobject_input_visitor_base_new(obj);
 702
 703     v->visitor.type_int64 = qobject_input_type_int64_keyval;
 704     v->visitor.type_uint64 = qobject_input_type_uint64_keyval;
 705     v->visitor.type_bool = qobject_input_type_bool_keyval;
 706     v->visitor.type_str = qobject_input_type_str_keyval;
 707     v->visitor.type_number = qobject_input_type_number_keyval;
 708     v->visitor.type_any = qobject_input_type_any;
 709     v->visitor.type_null = qobject_input_type_null;
 710     v->visitor.type_size = qobject_input_type_size_keyval;
 711     v->keyval = true;
 712
 713     return &v->visitor;
 714 }
 715
 716 Visitor *qobject_input_visitor_new_str(const char *str,
 717                                        const char *implied_key,
 718                                        Error **errp)
 719 {
 720     bool is_json = str[0] == '{';
 721     QObject *obj;
 722     QDict *args;
 723     Visitor *v;
 724
 725     if (is_json) {
 726         obj = qobject_from_json(str, errp);
 727         if (!obj) {
 728             return NULL;
 729         }
 730         args = qobject_to(QDict, obj);
 731         assert(args);
 732         v = qobject_input_visitor_new(QOBJECT(args));
 733     } else {
 734         args = keyval_parse(str, implied_key, errp);
 735         if (!args) {
 736             return NULL;
 737         }
 738         v = qobject_input_visitor_new_keyval(QOBJECT(args));
 739     }
 740     qobject_unref(args);
 741
 742     return v;
 743 }