Add repr(transparent) to Reg struct

couchand · couchand · commit 96cfd8cc66f7 · 2020-10-09T21:44:42.000-04:00
To guarantee that the register has the proper layout so that the cast
of an integer to a *const RegisterBlock is sound.
diff --git a/src/generate/generic.rs b/src/generate/generic.rs
@@ -34,6 +34,7 @@ pub trait Resettable: RegisterSpec {
 }
 
 /// This structure provides volatile access to registers.
+#[repr(transparent)]
 pub struct Reg<REG: RegisterSpec> {
     register: vcell::VolatileCell<REG::Ux>,
     _marker: marker::PhantomData<REG>,

Original file line number	Diff line number	Diff line change
`@@ -34,6 +34,7 @@ pub trait Resettable: RegisterSpec {`
`34`	`34`	`}`
`35`	`35`
`36`	`36`	`/// This structure provides volatile access to registers.`
	`37`	`+#[repr(transparent)]`
`37`	`38`	`pub struct Reg<REG: RegisterSpec> {`
`38`	`39`	`register: vcell::VolatileCell<REG::Ux>,`
`39`	`40`	`_marker: marker::PhantomData<REG>,`