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wrap references to resources in static-ref's Ref/RefMut

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to assert that they point to `static` data
This commit is contained in:
Jorge Aparicio 2017-04-14 09:45:50 -05:00
parent 4d8d53a206
commit a94de6bafc
3 changed files with 30 additions and 23 deletions
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1
Cargo.toml
View file

@ -11,6 +11,7 @@ syn = "0.11.10"
[dependencies]
cortex-m = "0.2.2"
typenum = "1.7.0"
static-ref = { git = "https://github.com/japaric/static-ref" }
[dev-dependencies]
compiletest_rs = "0.2.5"

38
src/lib.rs
View file

@ -7,6 +7,7 @@
#![no_std]
extern crate cortex_m;
extern crate static_ref;
extern crate typenum;
use core::cell::UnsafeCell;
@ -16,6 +17,7 @@ use cortex_m::ctxt::Context;
use cortex_m::interrupt::Nr;
#[cfg(not(thumbv6m))]
use cortex_m::register::{basepri, basepri_max};
use static_ref::{Ref, RefMut};
use typenum::{Cmp, Equal, Unsigned};
#[cfg(not(thumbv6m))]
use typenum::{Greater, Less};
@ -64,12 +66,12 @@ impl<T, CEILING> Resource<T, C<CEILING>> {
&'static self,
_priority: &P<PRIORITY>,
_system_ceiling: &'cs C<SCEILING>,
) -> &'cs T
) -> Ref<'cs, T>
where
SCEILING: GreaterThanOrEqual<CEILING>,
CEILING: GreaterThanOrEqual<PRIORITY>,
{
unsafe { &*self.data.get() }
unsafe { Ref::new(&*self.data.get()) }
}
/// Claims the resource at the task with highest priority
@ -78,11 +80,11 @@ impl<T, CEILING> Resource<T, C<CEILING>> {
pub fn claim<'task, PRIORITY>(
&'static self,
_priority: &'task P<PRIORITY>,
) -> &'task T
) -> Ref<'task, T>
where
CEILING: Cmp<PRIORITY, Output = Equal>,
{
unsafe { &*self.data.get() }
unsafe { Ref::new(&*self.data.get()) }
}
/// Like [Resource.claim](struct.Resource.html#method.claim) but returns a
@ -90,11 +92,11 @@ impl<T, CEILING> Resource<T, C<CEILING>> {
pub fn claim_mut<'task, PRIORITY>(
&'static self,
_priority: &'task mut P<PRIORITY>,
) -> &'task mut T
) -> RefMut<'task, T>
where
CEILING: Cmp<PRIORITY, Output = Equal>,
{
unsafe { &mut *self.data.get() }
unsafe { RefMut::new(&mut *self.data.get()) }
}
/// Locks the resource for the duration of the critical section `f`
@ -113,7 +115,7 @@ impl<T, CEILING> Resource<T, C<CEILING>> {
f: F,
) -> R
where
F: FnOnce(&T, C<CEILING>) -> R,
F: FnOnce(Ref<T>, C<CEILING>) -> R,
CEILING: Cmp<PRIORITY, Output = Greater> + Cmp<UMAX, Output = Less>
+ Level,
{
@ -121,7 +123,8 @@ impl<T, CEILING> Resource<T, C<CEILING>> {
let old_basepri = basepri::read();
basepri_max::write(<CEILING>::hw());
barrier!();
let ret = f(&*self.data.get(), C { _marker: PhantomData });
let ret =
f(Ref::new(&*self.data.get()), C { _marker: PhantomData });
barrier!();
basepri::write(old_basepri);
ret
@ -141,7 +144,7 @@ impl<T, CEILING> Resource<T, C<CEILING>> {
f: F,
) -> R
where
F: FnOnce(&mut T) -> R,
F: FnOnce(RefMut<T>) -> R,
CEILING: Cmp<PRIORITY, Output = Greater> + Cmp<UMAX, Output = Less>
+ Level,
{
@ -149,7 +152,7 @@ impl<T, CEILING> Resource<T, C<CEILING>> {
let old_basepri = basepri::read();
basepri_max::write(<CEILING>::hw());
barrier!();
let ret = f(&mut *self.data.get());
let ret = f(RefMut::new(&mut *self.data.get()));
barrier!();
basepri::write(old_basepri);
ret
@ -196,23 +199,23 @@ impl<Periph, CEILING> Peripheral<Periph, C<CEILING>> {
&'static self,
_priority: &P<PRIORITY>,
_system_ceiling: &'cs C<SCEILING>,
) -> &'cs Periph
) -> Ref<'cs, Periph>
where
SCEILING: GreaterThanOrEqual<CEILING>,
CEILING: GreaterThanOrEqual<PRIORITY>,
{
unsafe { &*self.peripheral.get() }
unsafe { Ref::new(&*self.peripheral.get()) }
}
/// See [Resource.claim](./struct.Resource.html#method.claim)
pub fn claim<'task, PRIORITY>(
&'static self,
_priority: &'task P<PRIORITY>,
) -> &'task Periph
) -> Ref<'task, Periph>
where
CEILING: Cmp<PRIORITY, Output = Equal>,
{
unsafe { &*self.peripheral.get() }
unsafe { Ref::new(&*self.peripheral.get()) }
}
/// See [Resource.lock](./struct.Resource.html#method.lock)
@ -223,7 +226,7 @@ impl<Periph, CEILING> Peripheral<Periph, C<CEILING>> {
f: F,
) -> R
where
F: FnOnce(&Periph, C<CEILING>) -> R,
F: FnOnce(Ref<Periph>, C<CEILING>) -> R,
CEILING: Cmp<PRIORITY, Output = Greater> + Cmp<UMAX, Output = Less>
+ Level,
{
@ -231,7 +234,10 @@ impl<Periph, CEILING> Peripheral<Periph, C<CEILING>> {
let old_basepri = basepri::read();
basepri_max::write(<CEILING>::hw());
barrier!();
let ret = f(&*self.peripheral.get(), C { _marker: PhantomData });
let ret = f(
Ref::new(&*self.peripheral.get()),
C { _marker: PhantomData },
);
barrier!();
basepri::write(old_basepri);
ret

14
tests/cfail/claim_mut.rs
View file

@ -8,26 +8,26 @@ static R1: Resource<i32, C2> = Resource::new(0);
fn j1(mut prio: P2) {
// OK only one `&mut-` reference to the data
let r1: &mut i32 = R1.claim_mut(&mut prio);
let r1 = R1.claim_mut(&mut prio);
}
fn j2(prio: P2) {
// OK two `&-` references to the same data
let r1: &i32 = R1.claim(&prio);
let another_r1: &i32 = R1.claim(&prio);
let r1 = R1.claim(&prio);
let another_r1 = R1.claim(&prio);
}
fn j3(mut prio: P2) {
// CAN'T have a `&-` reference and a `&mut-` reference to the same data
let r1: &i32 = R1.claim(&prio);
let another_r1: &mut i32 = R1.claim_mut(&mut prio);
let r1 = R1.claim(&prio);
let another_r1 = R1.claim_mut(&mut prio);
//~^ error
}
fn j4(mut prio: P2) {
// CAN'T have two `&mut-` references to the same data
let r1: &mut i32 = R1.claim_mut(&mut prio);
let another_r1: &mut i32 = R1.claim_mut(&mut prio);
let r1 = R1.claim_mut(&mut prio);
let another_r1 = R1.claim_mut(&mut prio);
//~^ error
}