[PATCH 3/8] hwcore: add prelude

[Paolo Bonzini <pbonzini@redhat.com>]

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 rust/hw/char/pl011/src/device.rs |  5 +----
 rust/hw/core/meson.build         |  1 +
 rust/hw/core/src/lib.rs          |  5 +++++
 rust/hw/core/src/prelude.rs      | 14 ++++++++++++++
 rust/hw/core/tests/tests.rs      |  2 +-
 rust/hw/timer/hpet/src/device.rs |  5 +----
 6 files changed, 23 insertions(+), 9 deletions(-)
 create mode 100644 rust/hw/core/src/prelude.rs

diff --git a/rust/hw/char/pl011/src/device.rs b/rust/hw/char/pl011/src/device.rs
index b7e8e393d2e..164f27d5bb2 100644
--- a/rust/hw/char/pl011/src/device.rs
+++ b/rust/hw/char/pl011/src/device.rs
@@ -7,10 +7,7 @@
 use bql::BqlRefCell;
 use chardev::{CharFrontend, Chardev, Event};
 use common::prelude::*;
-use hwcore::{
-    Clock, ClockEvent, DeviceImpl, DeviceMethods, DeviceState, IRQState, InterruptSource,
-    ResetType, ResettablePhasesImpl, SysBusDevice, SysBusDeviceImpl, SysBusDeviceMethods,
-};
+use hwcore::{prelude::*, ClockEvent, IRQState};
 use migration::{
     self, impl_vmstate_forward, impl_vmstate_struct, vmstate_fields, vmstate_of,
     vmstate_subsections, vmstate_unused, VMStateDescription, VMStateDescriptionBuilder,
diff --git a/rust/hw/core/meson.build b/rust/hw/core/meson.build
index 1560dd20c6b..fa1765a2302 100644
--- a/rust/hw/core/meson.build
+++ b/rust/hw/core/meson.build
@@ -51,6 +51,7 @@ _hwcore_rs = static_library(
       'src/lib.rs',
       'src/bindings.rs',
       'src/irq.rs',
+      'src/prelude.rs',
       'src/qdev.rs',
       'src/sysbus.rs',
     ],
diff --git a/rust/hw/core/src/lib.rs b/rust/hw/core/src/lib.rs
index b40801eb843..491743d2b9d 100644
--- a/rust/hw/core/src/lib.rs
+++ b/rust/hw/core/src/lib.rs
@@ -8,6 +8,11 @@
 mod irq;
 pub use irq::*;
 
+// preserve one-item-per-"use" syntax, it is clearer
+// for prelude-like modules
+#[rustfmt::skip]
+pub mod prelude;
+
 mod qdev;
 pub use qdev::*;
 
diff --git a/rust/hw/core/src/prelude.rs b/rust/hw/core/src/prelude.rs
new file mode 100644
index 00000000000..c544c317b39
--- /dev/null
+++ b/rust/hw/core/src/prelude.rs
@@ -0,0 +1,14 @@
+//! Essential types and traits intended for blanket imports.
+
+pub use crate::qdev::Clock;
+pub use crate::qdev::DeviceState;
+pub use crate::qdev::DeviceImpl;
+pub use crate::qdev::DeviceMethods;
+pub use crate::qdev::ResettablePhasesImpl;
+pub use crate::qdev::ResetType;
+
+pub use crate::sysbus::SysBusDevice;
+pub use crate::sysbus::SysBusDeviceImpl;
+pub use crate::sysbus::SysBusDeviceMethods;
+
+pub use crate::irq::InterruptSource;
diff --git a/rust/hw/core/tests/tests.rs b/rust/hw/core/tests/tests.rs
index 247d812866d..b39d1501d5b 100644
--- a/rust/hw/core/tests/tests.rs
+++ b/rust/hw/core/tests/tests.rs
@@ -5,7 +5,7 @@
 use std::{ffi::CStr, ptr::addr_of};
 
 use bql::BqlCell;
-use hwcore::{DeviceImpl, DeviceState, ResettablePhasesImpl, SysBusDevice};
+use hwcore::prelude::*;
 use migration::{VMStateDescription, VMStateDescriptionBuilder};
 use qom::{prelude::*, ObjectImpl, ParentField};
 use util::bindings::{module_call_init, module_init_type};
diff --git a/rust/hw/timer/hpet/src/device.rs b/rust/hw/timer/hpet/src/device.rs
index e9c7afa24d5..7ab9897cdfb 100644
--- a/rust/hw/timer/hpet/src/device.rs
+++ b/rust/hw/timer/hpet/src/device.rs
@@ -12,10 +12,7 @@
 
 use bql::{BqlCell, BqlRefCell};
 use common::prelude::*;
-use hwcore::{
-    DeviceImpl, DeviceMethods, DeviceState, InterruptSource, ResetType, ResettablePhasesImpl,
-    SysBusDevice, SysBusDeviceImpl, SysBusDeviceMethods,
-};
+use hwcore::prelude::*;
 use migration::{
     self, impl_vmstate_struct, vmstate_fields, vmstate_of, vmstate_subsections, vmstate_validate,
     VMStateDescription, VMStateDescriptionBuilder,
-- 
2.51.1