Re: [PATCH 12/12] qom: Drop container_get()

["Daniel P. Berrangé" <berrange@redhat.com>]

Subject says drop container_get, actual commit does alot more.

Suggest splitting the conversion to (object/machine)_get_container,
from the dropping of container_get.

On Wed, Nov 20, 2024 at 04:57:03PM -0500, Peter Xu wrote:
> Now we should be ready to always create containers upfront, meanwhile we
> have explicit helpers to fetch either:
> 
>   - Root containers (object_get_container()), or
>   - Machine containers (machine_get_container()).
> 
> Change all rest container_get() users to use the explicit & fast version of
> container lookup helpers, finally remove container_get().
> 
> Suggested-by: Daniel P. Berrangé <berrange@redhat.com>
> Suggested-by: Markus Armbruster <armbru@redhat.com>
> Signed-off-by: Peter Xu <peterx@redhat.com>
> ---
>  include/qom/object.h  | 12 ------------
>  backends/cryptodev.c  |  4 ++--
>  chardev/char.c        |  2 +-
>  hw/core/gpio.c        |  3 +--
>  hw/core/qdev.c        |  3 +--
>  hw/core/sysbus.c      |  4 ++--
>  hw/i386/pc.c          |  4 ++--
>  qom/container.c       | 23 -----------------------
>  qom/object.c          |  2 +-
>  scsi/pr-manager.c     |  4 ++--
>  system/ioport.c       |  2 +-
>  system/memory.c       |  2 +-
>  system/qdev-monitor.c |  6 +++---
>  system/vl.c           |  3 +--
>  ui/dbus-chardev.c     |  2 +-
>  15 files changed, 19 insertions(+), 57 deletions(-)

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>

> 
> diff --git a/include/qom/object.h b/include/qom/object.h
> index 87b13f9681..c6e7a7fc08 100644
> --- a/include/qom/object.h
> +++ b/include/qom/object.h
> @@ -2031,18 +2031,6 @@ int object_child_foreach(Object *obj, int (*fn)(Object *child, void *opaque),
>  int object_child_foreach_recursive(Object *obj,
>                                     int (*fn)(Object *child, void *opaque),
>                                     void *opaque);
> -/**
> - * container_get:
> - * @root: root of the #path, e.g., object_get_root()
> - * @path: path to the container
> - *
> - * Return a container object whose path is @path.  Create more containers
> - * along the path if necessary.
> - *
> - * Returns: the container object.
> - */
> -Object *container_get(Object *root, const char *path);
> -
>  
>  /**
>   * container_create:
> diff --git a/backends/cryptodev.c b/backends/cryptodev.c
> index d8bd2a1ae6..263de4913b 100644
> --- a/backends/cryptodev.c
> +++ b/backends/cryptodev.c
> @@ -97,7 +97,7 @@ static int qmp_query_cryptodev_foreach(Object *obj, void *data)
>  QCryptodevInfoList *qmp_query_cryptodev(Error **errp)
>  {
>      QCryptodevInfoList *list = NULL;
> -    Object *objs = container_get(object_get_root(), "/objects");
> +    Object *objs = object_get_container("objects");
>  
>      object_child_foreach(objs, qmp_query_cryptodev_foreach, &list);
>  
> @@ -557,7 +557,7 @@ static void cryptodev_backend_stats_cb(StatsResultList **result,
>      switch (target) {
>      case STATS_TARGET_CRYPTODEV:
>      {
> -        Object *objs = container_get(object_get_root(), "/objects");
> +        Object *objs = object_get_container("objects");
>          StatsArgs stats_args;
>          stats_args.result.stats = result;
>          stats_args.names = names;
> diff --git a/chardev/char.c b/chardev/char.c
> index a1722aa076..22fc5f7f76 100644
> --- a/chardev/char.c
> +++ b/chardev/char.c
> @@ -48,7 +48,7 @@
>  
>  Object *get_chardevs_root(void)
>  {
> -    return container_get(object_get_root(), "/chardevs");
> +    return object_get_container("chardevs");
>  }
>  
>  static void chr_be_event(Chardev *s, QEMUChrEvent event)
> diff --git a/hw/core/gpio.c b/hw/core/gpio.c
> index 80d07a6ec9..6e32a8eec6 100644
> --- a/hw/core/gpio.c
> +++ b/hw/core/gpio.c
> @@ -121,8 +121,7 @@ void qdev_connect_gpio_out_named(DeviceState *dev, const char *name, int n,
>                                       name ? name : "unnamed-gpio-out", n);
>      if (input_pin && !OBJECT(input_pin)->parent) {
>          /* We need a name for object_property_set_link to work */
> -        object_property_add_child(container_get(qdev_get_machine(),
> -                                                "/unattached"),
> +        object_property_add_child(machine_get_container("unattached"),
>                                    "non-qdev-gpio[*]", OBJECT(input_pin));
>      }
>      object_property_set_link(OBJECT(dev), propname,
> diff --git a/hw/core/qdev.c b/hw/core/qdev.c
> index 6cb4fe4691..8051961fe5 100644
> --- a/hw/core/qdev.c
> +++ b/hw/core/qdev.c
> @@ -476,8 +476,7 @@ static void device_set_realized(Object *obj, bool value, Error **errp)
>          if (!obj->parent) {
>              gchar *name = g_strdup_printf("device[%d]", unattached_count++);
>  
> -            object_property_add_child(container_get(qdev_get_machine(),
> -                                                    "/unattached"),
> +            object_property_add_child(machine_get_container("unattached"),
>                                        name, obj);
>              unattached_parent = true;
>              g_free(name);
> diff --git a/hw/core/sysbus.c b/hw/core/sysbus.c
> index e64d99c8ed..9355849ff0 100644
> --- a/hw/core/sysbus.c
> +++ b/hw/core/sysbus.c
> @@ -65,9 +65,9 @@ void foreach_dynamic_sysbus_device(FindSysbusDeviceFunc *func, void *opaque)
>      };
>  
>      /* Loop through all sysbus devices that were spawned outside the machine */
> -    container = container_get(qdev_get_machine(), "/peripheral");
> +    container = machine_get_container("peripheral");
>      find_sysbus_device(container, &find);
> -    container = container_get(qdev_get_machine(), "/peripheral-anon");
> +    container = machine_get_container("peripheral-anon");
>      find_sysbus_device(container, &find);
>  }
>  
> diff --git a/hw/i386/pc.c b/hw/i386/pc.c
> index 317aaca25a..b8ec2506e1 100644
> --- a/hw/i386/pc.c
> +++ b/hw/i386/pc.c
> @@ -460,7 +460,7 @@ static int check_fdc(Object *obj, void *opaque)
>  }
>  
>  static const char * const fdc_container_path[] = {
> -    "/unattached", "/peripheral", "/peripheral-anon"
> +    "unattached", "peripheral", "peripheral-anon"
>  };
>  
>  /*
> @@ -474,7 +474,7 @@ static ISADevice *pc_find_fdc0(void)
>      CheckFdcState state = { 0 };
>  
>      for (i = 0; i < ARRAY_SIZE(fdc_container_path); i++) {
> -        container = container_get(qdev_get_machine(), fdc_container_path[i]);
> +        container = machine_get_container(fdc_container_path[i]);
>          object_child_foreach(container, check_fdc, &state);
>      }
>  
> diff --git a/qom/container.c b/qom/container.c
> index da657754a4..5e36fb8773 100644
> --- a/qom/container.c
> +++ b/qom/container.c
> @@ -38,27 +38,4 @@ Object *container_create(Object *obj, const char *name)
>      return child;
>  }
>  
> -Object *container_get(Object *root, const char *path)
> -{
> -    Object *obj, *child;
> -    char **parts;
> -    int i;
> -
> -    parts = g_strsplit(path, "/", 0);
> -    assert(parts != NULL && parts[0] != NULL && !parts[0][0]);
> -    obj = root;
> -
> -    for (i = 1; parts[i] != NULL; i++, obj = child) {
> -        child = object_resolve_path_component(obj, parts[i]);
> -        if (!child) {
> -            child = container_create(obj, parts[i]);
> -        }
> -    }
> -
> -    g_strfreev(parts);
> -
> -    return obj;
> -}
> -
> -
>  type_init(container_register_types)
> diff --git a/qom/object.c b/qom/object.c
> index cf66803a6a..aeb04c483c 100644
> --- a/qom/object.c
> +++ b/qom/object.c
> @@ -1771,7 +1771,7 @@ Object *object_get_root(void)
>  
>  Object *object_get_objects_root(void)
>  {
> -    return container_get(object_get_root(), "/objects");
> +    return object_get_container("objects");
>  }
>  
>  Object *object_get_internal_root(void)
> diff --git a/scsi/pr-manager.c b/scsi/pr-manager.c
> index fb5fc29730..1977d99ce0 100644
> --- a/scsi/pr-manager.c
> +++ b/scsi/pr-manager.c
> @@ -21,7 +21,7 @@
>  #include "qemu/module.h"
>  #include "qapi/qapi-commands-block.h"
>  
> -#define PR_MANAGER_PATH     "/objects"
> +#define PR_MANAGER_PATH     "objects"
>  
>  typedef struct PRManagerData {
>      PRManager *pr_mgr;
> @@ -135,7 +135,7 @@ PRManagerInfoList *qmp_query_pr_managers(Error **errp)
>  {
>      PRManagerInfoList *head = NULL;
>      PRManagerInfoList **prev = &head;
> -    Object *container = container_get(object_get_root(), PR_MANAGER_PATH);
> +    Object *container = object_get_container(PR_MANAGER_PATH);
>  
>      object_child_foreach(container, query_one_pr_manager, &prev);
>      return head;
> diff --git a/system/ioport.c b/system/ioport.c
> index fd551d0375..55c2a75239 100644
> --- a/system/ioport.c
> +++ b/system/ioport.c
> @@ -258,7 +258,7 @@ static void portio_list_add_1(PortioList *piolist,
>      object_ref(&mrpio->mr);
>      object_unparent(OBJECT(&mrpio->mr));
>      if (!piolist->owner) {
> -        owner = container_get(qdev_get_machine(), "/unattached");
> +        owner = machine_get_container("unattached");
>      } else {
>          owner = piolist->owner;
>      }
> diff --git a/system/memory.c b/system/memory.c
> index 85f6834cb3..fba351b030 100644
> --- a/system/memory.c
> +++ b/system/memory.c
> @@ -1238,7 +1238,7 @@ static void memory_region_do_init(MemoryRegion *mr,
>          char *name_array = g_strdup_printf("%s[*]", escaped_name);
>  
>          if (!owner) {
> -            owner = container_get(qdev_get_machine(), "/unattached");
> +            owner = machine_get_container("unattached");
>          }
>  
>          object_property_add_child(owner, name_array, OBJECT(mr));
> diff --git a/system/qdev-monitor.c b/system/qdev-monitor.c
> index 4c09b38ffb..4d46af2c8d 100644
> --- a/system/qdev-monitor.c
> +++ b/system/qdev-monitor.c
> @@ -348,7 +348,7 @@ static Object *qdev_get_peripheral(void)
>      static Object *dev;
>  
>      if (dev == NULL) {
> -        dev = container_get(qdev_get_machine(), "/peripheral");
> +        dev = machine_get_container("peripheral");
>      }
>  
>      return dev;
> @@ -359,7 +359,7 @@ static Object *qdev_get_peripheral_anon(void)
>      static Object *dev;
>  
>      if (dev == NULL) {
> -        dev = container_get(qdev_get_machine(), "/peripheral-anon");
> +        dev = machine_get_container("peripheral-anon");
>      }
>  
>      return dev;
> @@ -1085,7 +1085,7 @@ static GSList *qdev_build_hotpluggable_device_list(Object *peripheral)
>  static void peripheral_device_del_completion(ReadLineState *rs,
>                                               const char *str)
>  {
> -    Object *peripheral = container_get(qdev_get_machine(), "/peripheral");
> +    Object *peripheral = machine_get_container("peripheral");
>      GSList *list, *item;
>  
>      list = qdev_build_hotpluggable_device_list(peripheral);
> diff --git a/system/vl.c b/system/vl.c
> index 3bb8f2db9a..822f7ff656 100644
> --- a/system/vl.c
> +++ b/system/vl.c
> @@ -2120,8 +2120,7 @@ static void qemu_create_machine(QDict *qdict)
>      current_machine = MACHINE(object_new_with_class(OBJECT_CLASS(machine_class)));
>      object_property_add_child(object_get_root(), "machine",
>                                OBJECT(current_machine));
> -    object_property_add_child(container_get(OBJECT(current_machine),
> -                                            "/unattached"),
> +    object_property_add_child(machine_get_container("unattached"),
>                                "sysbus", OBJECT(sysbus_get_default()));
>  
>      if (machine_class->minimum_page_bits) {
> diff --git a/ui/dbus-chardev.c b/ui/dbus-chardev.c
> index 1d3a7122a1..bf061cbc93 100644
> --- a/ui/dbus-chardev.c
> +++ b/ui/dbus-chardev.c
> @@ -106,7 +106,7 @@ dbus_chardev_init(DBusDisplay *dpy)
>      dpy->notifier.notify = dbus_display_on_notify;
>      dbus_display_notifier_add(&dpy->notifier);
>  
> -    object_child_foreach(container_get(object_get_root(), "/chardevs"),
> +    object_child_foreach(object_get_container("chardevs"),
>                           dbus_display_chardev_foreach, dpy);
>  }
>  
> -- 
> 2.45.0
> 

With regards,
Daniel
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