hw/acpi: move object_resolve_type_unambiguous to core QOM

object_resolve_type_unambiguous provides a useful functionality, that
is currently emulated for example by usb_bus_find().  Move it to core
code and add error reporting for increased generality.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20240223124406.234509-2-pbonzini@redhat.com>
[PMD: Fixed style]
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/qom/object.c b/qom/object.c
index 2c4c64d2b6..d4a001cf41 100644
--- a/qom/object.c
+++ b/qom/object.c
@@ -2229,6 +2229,22 @@ Object *object_resolve_path_at(Object *parent, const char *path)
     return object_resolve_abs_path(parent, parts, TYPE_OBJECT);
 }
 
+Object *object_resolve_type_unambiguous(const char *typename, Error **errp)
+{
+    bool ambig;
+    Object *o = object_resolve_path_type("", typename, &ambig);
+
+    if (ambig) {
+        error_setg(errp, "More than one object of type %s", typename);
+        return NULL;
+    }
+    if (!o) {
+        error_setg(errp, "No object found of type %s", typename);
+        return NULL;
+    }
+    return o;
+}
+
 typedef struct StringProperty
 {
     char *(*get)(Object *, Error **);