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Replace std::mem::uninitialized with MaybeUninit (#1027)

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* Replace `std::mem::uninitialized` with `MaybeUninit`

* Avoid undefined behavior when using `MaybeUninit`

* Restore unused `PointerState` fields as internally public

* Zero-initialize some struct values in Xlib FFI calls

* Reform usage of `MaybeUninit` in Xlib FFI

* Prefer safe zero-initialization using `Default`, when possible
* Zero-initialize integers and floats using `0` or `0.0`
* Use `MaybeUninit::uninit` for large byte buffers and union types
* Use `MaybeUninit::uninit` when the resulting value is ignored
This commit is contained in:
Murarth 2019-07-11 09:34:32 -07:00 • committed by Hal Gentz
parent 17b8310517
commit 7daf146801
9 changed files with 186 additions and 126 deletions
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35
src/platform_impl/linux/x11/util/client_msg.rs
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@ -30,13 +30,17 @@ impl XConnection {
event_mask: Option<c_long>,
data: ClientMsgPayload,
) -> Flusher<'_> {
let mut event: ffi::XClientMessageEvent = unsafe { mem::uninitialized() };
event.type_ = ffi::ClientMessage;
event.display = self.display;
event.window = window;
event.message_type = message_type;
event.format = c_long::FORMAT as c_int;
event.data = unsafe { mem::transmute(data) };
let event = ffi::XClientMessageEvent {
type_: ffi::ClientMessage,
display: self.display,
window,
message_type,
format: c_long::FORMAT as c_int,
data: unsafe { mem::transmute(data) },
// These fields are ignored by `XSendEvent`
serial: 0,
send_event: 0,
};
self.send_event(target_window, event_mask, event)
}
@ -54,12 +58,17 @@ impl XConnection {
let format = T::FORMAT;
let size_of_t = mem::size_of::<T>();
debug_assert_eq!(size_of_t, format.get_actual_size());
let mut event: ffi::XClientMessageEvent = unsafe { mem::uninitialized() };
event.type_ = ffi::ClientMessage;
event.display = self.display;
event.window = window;
event.message_type = message_type;
event.format = format as c_int;
let mut event = ffi::XClientMessageEvent {
type_: ffi::ClientMessage,
display: self.display,
window,
message_type,
format: format as c_int,
data: ffi::ClientMessageData::new(),
// These fields are ignored by `XSendEvent`
serial: 0,
send_event: 0,
};
let t_per_payload = format.get_payload_size() / size_of_t;
assert!(t_per_payload > 0);