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Re: [PATCH 4/6] qom: Add object_child_foreach_type() helper function
From: |
David Gibson |
Subject: |
Re: [PATCH 4/6] qom: Add object_child_foreach_type() helper function |
Date: |
Thu, 24 Oct 2019 14:07:15 +1100 |
User-agent: |
Mutt/1.12.1 (2019-06-15) |
On Thu, Oct 24, 2019 at 01:59:03PM +1100, David Gibson wrote:
> On Wed, Oct 23, 2019 at 04:52:16PM +0200, Greg Kurz wrote:
> > Calling a function for children of a certain type is a recurring pattern
> > in the QEMU code base. In order to avoid the need to setup the same boiler
> > plate again and again, introduce a variant of object_child_foreach() that
> > only considers children of the given type.
> >
> > Signed-off-by: Greg Kurz <address@hidden>
>
> Reviewed-by: David Gibson <address@hidden>
Actually.. a couuple of caveats on that.
Reading it again the name is potentially misleading it's "for each
object of given type" not "for each type" So maybe
"object_child_foreach_of_type()".
Also, having created these, using them to simplify hmp_info_irq() and
hmp_info_pic() seems like a good idea.
>
> > ---
> > include/qom/object.h | 35 +++++++++++++++++++++++++++++++++++
> > qom/object.c | 30 +++++++++++++++++++++++-------
> > 2 files changed, 58 insertions(+), 7 deletions(-)
> >
> > diff --git a/include/qom/object.h b/include/qom/object.h
> > index 128d00c77fd6..e9e3c2eae8ed 100644
> > --- a/include/qom/object.h
> > +++ b/include/qom/object.h
> > @@ -1728,6 +1728,41 @@ 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);
> > +
> > +/**
> > + * object_child_foreach_type:
> > + * @obj: the object whose children will be navigated
> > + * @typename: the type of child objects to consider
> > + * @fn: the iterator function to be called
> > + * @opaque: an opaque value that will be passed to the iterator
> > + *
> > + * This is similar to object_child_foreach, but it only calls @fn for
> > + * child objects of the give @typename.
> > + *
> > + * Returns: The last value returned by @fn, or 0 if there is no child of
> > + * the given @typename.
> > + */
> > +int object_child_foreach_type(Object *obj, const char *typename,
> > + int (*fn)(Object *child, void *opaque),
> > + void *opaque);
> > +
> > +/**
> > + * object_child_foreach_recursive_type:
> > + * @obj: the object whose children will be navigated
> > + * @typename: the type of child objects to consider
> > + * @fn: the iterator function to be called
> > + * @opaque: an opaque value that will be passed to the iterator
> > + *
> > + * This is similar to object_child_foreach_recursive, but it only calls
> > + * @fn for child objects of the give @typename.
> > + *
> > + * Returns: The last value returned by @fn, or 0 if there is no child of
> > + * the given @typename.
> > + */
> > +int object_child_foreach_recursive_type(Object *obj, const char *typename,
> > + int (*fn)(Object *child, void
> > *opaque),
> > + void *opaque);
> > +
> > /**
> > * container_get:
> > * @root: root of the #path, e.g., object_get_root()
> > diff --git a/qom/object.c b/qom/object.c
> > index 6fa9c619fac4..a2dec1261ff7 100644
> > --- a/qom/object.c
> > +++ b/qom/object.c
> > @@ -986,7 +986,7 @@ void object_class_foreach(void (*fn)(ObjectClass
> > *klass, void *opaque),
> > enumerating_types = false;
> > }
> >
> > -static int do_object_child_foreach(Object *obj,
> > +static int do_object_child_foreach(Object *obj, const char *typename,
> > int (*fn)(Object *child, void *opaque),
> > void *opaque, bool recurse)
> > {
> > @@ -999,12 +999,14 @@ static int do_object_child_foreach(Object *obj,
> > if (object_property_is_child(prop)) {
> > Object *child = prop->opaque;
> >
> > - ret = fn(child, opaque);
> > - if (ret != 0) {
> > - break;
> > + if (!typename || object_dynamic_cast(child, typename)) {
> > + ret = fn(child, opaque);
> > + if (ret != 0) {
> > + break;
> > + }
> > }
> > if (recurse) {
> > - do_object_child_foreach(child, fn, opaque, true);
> > + do_object_child_foreach(child, typename, fn, opaque, true);
> > }
> > }
> > }
> > @@ -1014,14 +1016,28 @@ static int do_object_child_foreach(Object *obj,
> > int object_child_foreach(Object *obj, int (*fn)(Object *child, void
> > *opaque),
> > void *opaque)
> > {
> > - return do_object_child_foreach(obj, fn, opaque, false);
> > + return do_object_child_foreach(obj, NULL, fn, opaque, false);
> > }
> >
> > int object_child_foreach_recursive(Object *obj,
> > int (*fn)(Object *child, void *opaque),
> > void *opaque)
> > {
> > - return do_object_child_foreach(obj, fn, opaque, true);
> > + return do_object_child_foreach(obj, NULL, fn, opaque, true);
> > +}
> > +
> > +int object_child_foreach_type(Object *obj, const char *typename,
> > + int (*fn)(Object *child, void *opaque),
> > + void *opaque)
> > +{
> > + return do_object_child_foreach(obj, typename, fn, opaque, false);
> > +}
> > +
> > +int object_child_foreach_recursive_type(Object *obj, const char *typename,
> > + int (*fn)(Object *child, void
> > *opaque),
> > + void *opaque)
> > +{
> > + return do_object_child_foreach(obj, typename, fn, opaque, true);
> > }
> >
> > static void object_class_get_list_tramp(ObjectClass *klass, void *opaque)
> >
>
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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[PATCH 6/6] xive: Don't use CPU_FOREACH() to perform CAM line matching, Greg Kurz, 2019/10/23
[PATCH 5/6] spapr: Don't use CPU_FOREACH() in 'info pic', Greg Kurz, 2019/10/23