diff options
Diffstat (limited to 'hw/core/qdev-properties.c')
| -rw-r--r-- | hw/core/qdev-properties.c | 237 |
1 files changed, 157 insertions, 80 deletions
diff --git a/hw/core/qdev-properties.c b/hw/core/qdev-properties.c index 950ef48e01..91632f7be9 100644 --- a/hw/core/qdev-properties.c +++ b/hw/core/qdev-properties.c @@ -546,98 +546,187 @@ const PropertyInfo qdev_prop_size32 = { /* --- support for array properties --- */ -/* Used as an opaque for the object properties we add for each - * array element. Note that the struct Property must be first - * in the struct so that a pointer to this works as the opaque - * for the underlying element's property hooks as well as for - * our own release callback. +typedef struct ArrayElementList ArrayElementList; + +struct ArrayElementList { + ArrayElementList *next; + void *value; +}; + +/* + * Given an array property @parent_prop in @obj, return a Property for a + * specific element of the array. Arrays are backed by an uint32_t length field + * and an element array. @elem points at an element in this element array. */ -typedef struct { - struct Property prop; - char *propname; - ObjectPropertyRelease *release; -} ArrayElementProperty; - -/* object property release callback for array element properties: - * we call the underlying element's property release hook, and - * then free the memory we allocated when we added the property. +static Property array_elem_prop(Object *obj, Property *parent_prop, + const char *name, char *elem) +{ + return (Property) { + .info = parent_prop->arrayinfo, + .name = name, + /* + * This ugly piece of pointer arithmetic sets up the offset so + * that when the underlying release hook calls qdev_get_prop_ptr + * they get the right answer despite the array element not actually + * being inside the device struct. + */ + .offset = (uintptr_t)elem - (uintptr_t)obj, + }; +} + +/* + * Object property release callback for array properties: We call the + * underlying element's property release hook for each element. + * + * Note that it is the responsibility of the individual device's deinit + * to free the array proper. */ -static void array_element_release(Object *obj, const char *name, void *opaque) +static void release_prop_array(Object *obj, const char *name, void *opaque) { - ArrayElementProperty *p = opaque; - if (p->release) { - p->release(obj, name, opaque); + Property *prop = opaque; + uint32_t *alenptr = object_field_prop_ptr(obj, prop); + void **arrayptr = (void *)obj + prop->arrayoffset; + char *elem = *arrayptr; + int i; + + if (!prop->arrayinfo->release) { + return; + } + + for (i = 0; i < *alenptr; i++) { + Property elem_prop = array_elem_prop(obj, prop, name, elem); + prop->arrayinfo->release(obj, NULL, &elem_prop); + elem += prop->arrayfieldsize; } - g_free(p->propname); - g_free(p); } -static void set_prop_arraylen(Object *obj, Visitor *v, const char *name, - void *opaque, Error **errp) +/* + * Setter for an array property. This sets both the array length (which + * is technically the property field in the object) and the array itself + * (a pointer to which is stored in the additional field described by + * prop->arrayoffset). + */ +static void set_prop_array(Object *obj, Visitor *v, const char *name, + void *opaque, Error **errp) { - /* Setter for the property which defines the length of a - * variable-sized property array. As well as actually setting the - * array-length field in the device struct, we have to create the - * array itself and dynamically add the corresponding properties. - */ + ERRP_GUARD(); Property *prop = opaque; uint32_t *alenptr = object_field_prop_ptr(obj, prop); void **arrayptr = (void *)obj + prop->arrayoffset; - void *eltptr; - const char *arrayname; - int i; + ArrayElementList *list, *elem, *next; + const size_t size = sizeof(*list); + char *elemptr; + bool ok = true; if (*alenptr) { error_setg(errp, "array size property %s may not be set more than once", name); return; } - if (!visit_type_uint32(v, name, alenptr, errp)) { + + if (!visit_start_list(v, name, (GenericList **) &list, size, errp)) { return; } - if (!*alenptr) { + + /* Read the whole input into a temporary list */ + elem = list; + while (elem) { + Property elem_prop; + + elem->value = g_malloc0(prop->arrayfieldsize); + elem_prop = array_elem_prop(obj, prop, name, elem->value); + prop->arrayinfo->set(obj, v, NULL, &elem_prop, errp); + if (*errp) { + ok = false; + goto out_obj; + } + if (*alenptr == INT_MAX) { + error_setg(errp, "array is too big"); + return; + } + (*alenptr)++; + elem = (ArrayElementList *) visit_next_list(v, (GenericList*) elem, + size); + } + + ok = visit_check_list(v, errp); +out_obj: + visit_end_list(v, (void**) &list); + + if (!ok) { + for (elem = list; elem; elem = next) { + Property elem_prop = array_elem_prop(obj, prop, name, + elem->value); + if (prop->arrayinfo->release) { + prop->arrayinfo->release(obj, NULL, &elem_prop); + } + next = elem->next; + g_free(elem->value); + g_free(elem); + } return; } - /* DEFINE_PROP_ARRAY guarantees that name should start with this prefix; - * strip it off so we can get the name of the array itself. + /* + * Now that we know how big the array has to be, move the data over to a + * linear array and free the temporary list. */ - assert(strncmp(name, PROP_ARRAY_LEN_PREFIX, - strlen(PROP_ARRAY_LEN_PREFIX)) == 0); - arrayname = name + strlen(PROP_ARRAY_LEN_PREFIX); + *arrayptr = g_malloc_n(*alenptr, prop->arrayfieldsize); + elemptr = *arrayptr; + for (elem = list; elem; elem = next) { + memcpy(elemptr, elem->value, prop->arrayfieldsize); + elemptr += prop->arrayfieldsize; + next = elem->next; + g_free(elem->value); + g_free(elem); + } +} - /* Note that it is the responsibility of the individual device's deinit - * to free the array proper. - */ - *arrayptr = eltptr = g_malloc0(*alenptr * prop->arrayfieldsize); - for (i = 0; i < *alenptr; i++, eltptr += prop->arrayfieldsize) { - char *propname = g_strdup_printf("%s[%d]", arrayname, i); - ArrayElementProperty *arrayprop = g_new0(ArrayElementProperty, 1); - arrayprop->release = prop->arrayinfo->release; - arrayprop->propname = propname; - arrayprop->prop.info = prop->arrayinfo; - arrayprop->prop.name = propname; - /* This ugly piece of pointer arithmetic sets up the offset so - * that when the underlying get/set hooks call qdev_get_prop_ptr - * they get the right answer despite the array element not actually - * being inside the device struct. - */ - arrayprop->prop.offset = eltptr - (void *)obj; - assert(object_field_prop_ptr(obj, &arrayprop->prop) == eltptr); - object_property_add(obj, propname, - arrayprop->prop.info->name, - field_prop_getter(arrayprop->prop.info), - field_prop_setter(arrayprop->prop.info), - array_element_release, - arrayprop); +static void get_prop_array(Object *obj, Visitor *v, const char *name, + void *opaque, Error **errp) +{ + ERRP_GUARD(); + Property *prop = opaque; + uint32_t *alenptr = object_field_prop_ptr(obj, prop); + void **arrayptr = (void *)obj + prop->arrayoffset; + char *elem = *arrayptr; + GenericList *list; + const size_t list_elem_size = sizeof(*list) + prop->arrayfieldsize; + int i; + bool ok; + + if (!visit_start_list(v, name, &list, list_elem_size, errp)) { + return; } + + for (i = 0; i < *alenptr; i++) { + Property elem_prop = array_elem_prop(obj, prop, name, elem); + prop->arrayinfo->get(obj, v, NULL, &elem_prop, errp); + if (*errp) { + goto out_obj; + } + elem += prop->arrayfieldsize; + } + + /* visit_check_list() can only fail for input visitors */ + ok = visit_check_list(v, errp); + assert(ok); + +out_obj: + visit_end_list(v, (void**) &list); } -const PropertyInfo qdev_prop_arraylen = { - .name = "uint32", - .get = get_uint32, - .set = set_prop_arraylen, - .set_default_value = qdev_propinfo_set_default_value_uint, +static void default_prop_array(ObjectProperty *op, const Property *prop) +{ + object_property_set_default_list(op); +} + +const PropertyInfo qdev_prop_array = { + .name = "list", + .get = get_prop_array, + .set = set_prop_array, + .release = release_prop_array, + .set_default_value = default_prop_array, }; /* --- public helpers --- */ @@ -743,20 +832,8 @@ void qdev_prop_set_enum(DeviceState *dev, const char *name, int value) void qdev_prop_set_array(DeviceState *dev, const char *name, QList *values) { - const QListEntry *entry; - g_autofree char *prop_len = g_strdup_printf("len-%s", name); - uint32_t i = 0; - - object_property_set_int(OBJECT(dev), prop_len, qlist_size(values), - &error_abort); - - QLIST_FOREACH_ENTRY(values, entry) { - g_autofree char *prop_idx = g_strdup_printf("%s[%u]", name, i); - object_property_set_qobject(OBJECT(dev), prop_idx, entry->value, - &error_abort); - i++; - } - + object_property_set_qobject(OBJECT(dev), name, QOBJECT(values), + &error_abort); qobject_unref(values); } |