implement RFC #212

13 files changed, 148 insertions, 111 deletions

diff --git a/examples/cfg.rs b/examples/cfg.rs
index b1f65cfd..fb812cb0 100644
--- a/examples/cfg.rs
+++ b/examples/cfg.rs
@@ -11,25 +11,28 @@ use panic_semihosting as _;
 
 #[rtfm::app(device = lm3s6965)]
 const APP: () = {
-    #[cfg(debug_assertions)] // <- `true` when using the `dev` profile
-    static mut COUNT: u32 = 0;
+    struct Resources {
+        #[cfg(debug_assertions)] // <- `true` when using the `dev` profile
+        #[init(0)]
+        count: u32,
+    }
 
     #[init]
     fn init(_: init::Context) {
         // ..
     }
 
-    #[task(priority = 3, resources = [COUNT], spawn = [log])]
+    #[task(priority = 3, resources = [count], spawn = [log])]
     fn foo(_c: foo::Context) {
         #[cfg(debug_assertions)]
         {
-            *_c.resources.COUNT += 1;
+            *_c.resources.count += 1;
 
-            _c.spawn.log(*_c.resources.COUNT).ok();
+            _c.spawn.log(*_c.resources.count).ok();
         }
 
         // this wouldn't compile in `release` mode
-        // *resources.COUNT += 1;
+        // *resources.count += 1;
 
         // ..
     }
diff --git a/examples/generics.rs b/examples/generics.rs
index 562470d4..f0632d9a 100644
--- a/examples/generics.rs
+++ b/examples/generics.rs
@@ -12,7 +12,10 @@ use rtfm::{Exclusive, Mutex};
 
 #[rtfm::app(device = lm3s6965)]
 const APP: () = {
-    static mut SHARED: u32 = 0;
+    struct Resources {
+        #[init(0)]
+        shared: u32,
+    }
 
     #[init]
     fn init(_: init::Context) {
@@ -20,29 +23,29 @@ const APP: () = {
         rtfm::pend(Interrupt::UART1);
     }
 
-    #[task(binds = UART0, resources = [SHARED])]
+    #[task(binds = UART0, resources = [shared])]
     fn uart0(c: uart0::Context) {
         static mut STATE: u32 = 0;
 
         hprintln!("UART0(STATE = {})", *STATE).unwrap();
 
-        advance(STATE, c.resources.SHARED);
+        advance(STATE, c.resources.shared);
 
         rtfm::pend(Interrupt::UART1);
 
         debug::exit(debug::EXIT_SUCCESS);
     }
 
-    #[task(binds = UART1, priority = 2, resources = [SHARED])]
+    #[task(binds = UART1, priority = 2, resources = [shared])]
     fn uart1(c: uart1::Context) {
         static mut STATE: u32 = 0;
 
         hprintln!("UART1(STATE = {})", *STATE).unwrap();
 
-        // just to show that `SHARED` can be accessed directly
-        *c.resources.SHARED += 0;
+        // just to show that `shared` can be accessed directly
+        *c.resources.shared += 0;
 
-        advance(STATE, Exclusive(c.resources.SHARED));
+        advance(STATE, Exclusive(c.resources.shared));
     }
 };
 
@@ -55,5 +58,5 @@ fn advance(state: &mut u32, mut shared: impl Mutex<T = u32>) {
         (old, *shared)
     });
 
-    hprintln!("SHARED: {} -> {}", old, new).unwrap();
+    hprintln!("shared: {} -> {}", old, new).unwrap();
 }
diff --git a/examples/late.rs b/examples/late.rs
index 19807ff7..536d71aa 100644
--- a/examples/late.rs
+++ b/examples/late.rs
@@ -16,9 +16,9 @@ use panic_semihosting as _;
 #[rtfm::app(device = lm3s6965)]
 const APP: () = {
     // Late resources
-    extern "C" {
-        static mut P: Producer<'static, u32, U4>;
-        static mut C: Consumer<'static, u32, U4>;
+    struct Resources {
+        p: Producer<'static, u32, U4>,
+        c: Consumer<'static, u32, U4>,
     }
 
     #[init]
@@ -31,13 +31,13 @@ const APP: () = {
         let (p, c) = Q.as_mut().unwrap().split();
 
         // Initialization of late resources
-        init::LateResources { P: p, C: c }
+        init::LateResources { p, c }
     }
 
-    #[idle(resources = [C])]
+    #[idle(resources = [c])]
     fn idle(c: idle::Context) -> ! {
         loop {
-            if let Some(byte) = c.resources.C.dequeue() {
+            if let Some(byte) = c.resources.c.dequeue() {
                 hprintln!("received message: {}", byte).unwrap();
 
                 debug::exit(debug::EXIT_SUCCESS);
@@ -47,8 +47,8 @@ const APP: () = {
         }
     }
 
-    #[task(binds = UART0, resources = [P])]
+    #[task(binds = UART0, resources = [p])]
     fn uart0(c: uart0::Context) {
-        c.resources.P.enqueue(42).unwrap();
+        c.resources.p.enqueue(42).unwrap();
     }
 };
diff --git a/examples/lock.rs b/examples/lock.rs
index 17b6a58b..f33a60a4 100644
--- a/examples/lock.rs
+++ b/examples/lock.rs
@@ -11,7 +11,10 @@ use panic_semihosting as _;
 
 #[rtfm::app(device = lm3s6965)]
 const APP: () = {
-    static mut SHARED: u32 = 0;
+    struct Resources {
+        #[init(0)]
+        shared: u32,
+    }
 
     #[init]
     fn init(_: init::Context) {
@@ -19,21 +22,21 @@ const APP: () = {
     }
 
     // when omitted priority is assumed to be `1`
-    #[task(binds = GPIOA, resources = [SHARED])]
+    #[task(binds = GPIOA, resources = [shared])]
     fn gpioa(mut c: gpioa::Context) {
         hprintln!("A").unwrap();
 
         // the lower priority task requires a critical section to access the data
-        c.resources.SHARED.lock(|shared| {
+        c.resources.shared.lock(|shared| {
             // data can only be modified within this critical section (closure)
             *shared += 1;
 
             // GPIOB will *not* run right now due to the critical section
             rtfm::pend(Interrupt::GPIOB);
 
-            hprintln!("B - SHARED = {}", *shared).unwrap();
+            hprintln!("B - shared = {}", *shared).unwrap();
 
-            // GPIOC does not contend for `SHARED` so it's allowed to run now
+            // GPIOC does not contend for `shared` so it's allowed to run now
             rtfm::pend(Interrupt::GPIOC);
         });
 
@@ -44,12 +47,12 @@ const APP: () = {
         debug::exit(debug::EXIT_SUCCESS);
     }
 
-    #[task(binds = GPIOB, priority = 2, resources = [SHARED])]
+    #[task(binds = GPIOB, priority = 2, resources = [shared])]
     fn gpiob(c: gpiob::Context) {
         // the higher priority task does *not* need a critical section
-        *c.resources.SHARED += 1;
+        *c.resources.shared += 1;
 
-        hprintln!("D - SHARED = {}", *c.resources.SHARED).unwrap();
+        hprintln!("D - shared = {}", *c.resources.shared).unwrap();
     }
 
     #[task(binds = GPIOC, priority = 3)]
diff --git a/examples/not-send.rs b/examples/not-send.rs
index f240e511..d27cc82f 100644
--- a/examples/not-send.rs
+++ b/examples/not-send.rs
@@ -17,7 +17,10 @@ pub struct NotSend {
 
 #[app(device = lm3s6965)]
 const APP: () = {
-    static mut SHARED: Option<NotSend> = None;
+    struct Resources {
+        #[init(None)]
+        shared: Option<NotSend>,
+    }
 
     #[init(spawn = [baz, quux])]
     fn init(c: init::Context) {
@@ -36,16 +39,16 @@ const APP: () = {
         // scenario 1
     }
 
-    #[task(priority = 2, resources = [SHARED])]
+    #[task(priority = 2, resources = [shared])]
     fn baz(c: baz::Context) {
         // scenario 2: resource shared between tasks that run at the same priority
-        *c.resources.SHARED = Some(NotSend { _0: PhantomData });
+        *c.resources.shared = Some(NotSend { _0: PhantomData });
     }
 
-    #[task(priority = 2, resources = [SHARED])]
+    #[task(priority = 2, resources = [shared])]
     fn quux(c: quux::Context) {
         // scenario 2
-        let _not_send = c.resources.SHARED.take().unwrap();
+        let _not_send = c.resources.shared.take().unwrap();
 
         debug::exit(debug::EXIT_SUCCESS);
     }
diff --git a/examples/not-sync.rs b/examples/not-sync.rs
index 6b499111..f0f6075e 100644
--- a/examples/not-sync.rs
+++ b/examples/not-sync.rs
@@ -16,21 +16,24 @@ pub struct NotSync {
 
 #[rtfm::app(device = lm3s6965)]
 const APP: () = {
-    static SHARED: NotSync = NotSync { _0: PhantomData };
+    struct Resources {
+        #[init(NotSync { _0: PhantomData })]
+        shared: NotSync,
+    }
 
     #[init]
     fn init(_: init::Context) {
         debug::exit(debug::EXIT_SUCCESS);
     }
 
-    #[task(resources = [SHARED])]
+    #[task(resources = [shared])]
     fn foo(c: foo::Context) {
-        let _: &NotSync = c.resources.SHARED;
+        let _: &NotSync = c.resources.shared;
     }
 
-    #[task(resources = [SHARED])]
+    #[task(resources = [shared])]
     fn bar(c: bar::Context) {
-        let _: &NotSync = c.resources.SHARED;
+        let _: &NotSync = c.resources.shared;
     }
 
     extern "C" {
diff --git a/examples/resource.rs b/examples/resource.rs
index 661f8c35..2506a2cb 100644
--- a/examples/resource.rs
+++ b/examples/resource.rs
@@ -11,8 +11,11 @@ use panic_semihosting as _;
 
 #[rtfm::app(device = lm3s6965)]
 const APP: () = {
-    // A resource
-    static mut SHARED: u32 = 0;
+    struct Resources {
+        // A resource
+        #[init(0)]
+        shared: u32,
+    }
 
     #[init]
     fn init(_: init::Context) {
@@ -24,25 +27,25 @@ const APP: () = {
     fn idle(_: idle::Context) -> ! {
         debug::exit(debug::EXIT_SUCCESS);
 
-        // error: `SHARED` can't be accessed from this context
-        // SHARED += 1;
+        // error: `shared` can't be accessed from this context
+        // shared += 1;
 
         loop {}
     }
 
-    // `SHARED` can be access from this context
-    #[task(binds = UART0, resources = [SHARED])]
+    // `shared` can be access from this context
+    #[task(binds = UART0, resources = [shared])]
     fn uart0(c: uart0::Context) {
-        *c.resources.SHARED += 1;
+        *c.resources.shared += 1;
 
-        hprintln!("UART0: SHARED = {}", c.resources.SHARED).unwrap();
+        hprintln!("UART0: shared = {}", c.resources.shared).unwrap();
     }
 
-    // `SHARED` can be access from this context
-    #[task(binds = UART1, resources = [SHARED])]
+    // `shared` can be access from this context
+    #[task(binds = UART1, resources = [shared])]
     fn uart1(c: uart1::Context) {
-        *c.resources.SHARED += 1;
+        *c.resources.shared += 1;
 
-        hprintln!("UART1: SHARED = {}", c.resources.SHARED).unwrap();
+        hprintln!("UART1: shared = {}", c.resources.shared).unwrap();
     }
 };
diff --git a/examples/shared-with-init.rs b/examples/shared-with-init.rs
index ed73c8ba..14fa54b7 100644
--- a/examples/shared-with-init.rs
+++ b/examples/shared-with-init.rs
@@ -14,20 +14,23 @@ pub struct MustBeSend;
 
 #[app(device = lm3s6965)]
 const APP: () = {
-    static mut SHARED: Option<MustBeSend> = None;
+    struct Resources {
+        #[init(None)]
+        shared: Option<MustBeSend>,
+    }
 
-    #[init(resources = [SHARED])]
+    #[init(resources = [shared])]
     fn init(c: init::Context) {
         // this `message` will be sent to task `UART0`
         let message = MustBeSend;
-        *c.resources.SHARED = Some(message);
+        *c.resources.shared = Some(message);
 
         rtfm::pend(Interrupt::UART0);
     }
 
-    #[task(binds = UART0, resources = [SHARED])]
+    #[task(binds = UART0, resources = [shared])]
     fn uart0(c: uart0::Context) {
-        if let Some(message) = c.resources.SHARED.take() {
+        if let Some(message) = c.resources.shared.take() {
             // `message` has been received
             drop(message);
 
diff --git a/examples/static.rs b/examples/static.rs
index 5eb7b197..4af7ee67 100644
--- a/examples/static.rs
+++ b/examples/static.rs
@@ -11,8 +11,8 @@ use panic_semihosting as _;
 
 #[rtfm::app(device = lm3s6965)]
 const APP: () = {
-    extern "C" {
-        static KEY: u32;
+    struct Resources {
+        key: u32,
     }
 
     #[init]
@@ -20,18 +20,18 @@ const APP: () = {
         rtfm::pend(Interrupt::UART0);
         rtfm::pend(Interrupt::UART1);
 
-        init::LateResources { KEY: 0xdeadbeef }
+        init::LateResources { key: 0xdeadbeef }
     }
 
-    #[task(binds = UART0, resources = [KEY])]
+    #[task(binds = UART0, resources = [&key])]
     fn uart0(c: uart0::Context) {
-        hprintln!("UART0(KEY = {:#x})", c.resources.KEY).unwrap();
+        hprintln!("UART0(key = {:#x})", c.resources.key).unwrap();
 
         debug::exit(debug::EXIT_SUCCESS);
     }
 
-    #[task(binds = UART1, priority = 2, resources = [KEY])]
+    #[task(binds = UART1, priority = 2, resources = [&key])]
     fn uart1(c: uart1::Context) {
-        hprintln!("UART1(KEY = {:#x})", c.resources.KEY).unwrap();
+        hprintln!("UART1(key = {:#x})", c.resources.key).unwrap();
     }
 };
diff --git a/examples/t-cfg.rs b/examples/t-cfg.rs
index 158eef55..e61ec795 100644
--- a/examples/t-cfg.rs
+++ b/examples/t-cfg.rs
@@ -7,8 +7,11 @@ use panic_halt as _;
 
 #[rtfm::app(device = lm3s6965, monotonic = rtfm::cyccnt::CYCCNT)]
 const APP: () = {
-    #[cfg(never)]
-    static mut FOO: u32 = 0;
+    struct Resources {
+        #[cfg(never)]
+        #[init(0)]
+        foo: u32,
+    }
 
     #[init]
     fn init(_: init::Context) {
@@ -24,13 +27,13 @@ const APP: () = {
         loop {}
     }
 
-    #[task(resources = [FOO], schedule = [quux], spawn = [quux])]
+    #[task(resources = [foo], schedule = [quux], spawn = [quux])]
     fn foo(_: foo::Context) {
         #[cfg(never)]
         static mut BAR: u32 = 0;
     }
 
-    #[task(priority = 3, resources = [FOO], schedule = [quux], spawn = [quux])]
+    #[task(priority = 3, resources = [foo], schedule = [quux], spawn = [quux])]
     fn bar(_: bar::Context) {
         #[cfg(never)]
         static mut BAR: u32 = 0;
diff --git a/examples/t-late-not-send.rs b/examples/t-late-not-send.rs
index 55a053df..4fd3504e 100644
--- a/examples/t-late-not-send.rs
+++ b/examples/t-late-not-send.rs
@@ -13,23 +13,23 @@ pub struct NotSend {
 
 #[rtfm::app(device = lm3s6965)]
 const APP: () = {
-    extern "C" {
-        static mut X: NotSend;
+    struct Resources {
+        x: NotSend,
+        #[init(None)]
+        y: Option<NotSend>,
     }
 
-    static mut Y: Option<NotSend> = None;
-
-    #[init(resources = [Y])]
+    #[init(resources = [y])]
     fn init(c: init::Context) -> init::LateResources {
         // equivalent to late resource initialization
-        *c.resources.Y = Some(NotSend { _0: PhantomData });
+        *c.resources.y = Some(NotSend { _0: PhantomData });
 
         init::LateResources {
-            X: NotSend { _0: PhantomData },
+            x: NotSend { _0: PhantomData },
         }
     }
 
-    #[idle(resources = [X, Y])]
+    #[idle(resources = [x, y])]
     fn idle(_: idle::Context) -> ! {
         loop {}
     }
diff --git a/examples/t-resource.rs b/examples/t-resource.rs
index adcc04b3..303340ed 100644
--- a/examples/t-resource.rs
+++ b/examples/t-resource.rs
@@ -9,69 +9,79 @@ use panic_halt as _;
 
 #[rtfm::app(device = lm3s6965)]
 const APP: () = {
-    static mut O1: u32 = 0; // init
-    static mut O2: u32 = 0; // idle
-    static mut O3: u32 = 0; // EXTI0
-    static O4: u32 = 0; // idle
-    static O5: u32 = 0; // EXTI1
-    static O6: u32 = 0; // init
-
-    static mut S1: u32 = 0; // idle & EXTI0
-    static mut S2: u32 = 0; // EXTI0 & EXTI1
-    static S3: u32 = 0;
-
-    #[init(resources = [O1, O4, O5, O6, S3])]
+    struct Resources {
+        #[init(0)]
+        o1: u32, // init
+        #[init(0)]
+        o2: u32, // idle
+        #[init(0)]
+        o3: u32, // EXTI0
+        #[init(0)]
+        o4: u32, // idle
+        #[init(0)]
+        o5: u32, // EXTI1
+        #[init(0)]
+        o6: u32, // init
+        #[init(0)]
+        s1: u32, // idle & uart0
+        #[init(0)]
+        s2: u32, // uart0 & uart1
+        #[init(0)]
+        s3: u32, // idle & uart0
+    }
+
+    #[init(resources = [o1, o4, o5, o6, s3])]
     fn init(c: init::Context) {
         // owned by `init` == `&'static mut`
-        let _: &'static mut u32 = c.resources.O1;
+        let _: &'static mut u32 = c.resources.o1;
 
         // owned by `init` == `&'static` if read-only
-        let _: &'static u32 = c.resources.O6;
+        let _: &'static u32 = c.resources.o6;
 
         // `init` has exclusive access to all resources
-        let _: &mut u32 = c.resources.O4;
-        let _: &mut u32 = c.resources.O5;
-        let _: &mut u32 = c.resources.S3;
+        let _: &mut u32 = c.resources.o4;
+        let _: &mut u32 = c.resources.o5;
+        let _: &mut u32 = c.resources.s3;
     }
 
-    #[idle(resources = [O2, O4, S1, S3])]
+    #[idle(resources = [o2, &o4, s1, &s3])]
     fn idle(mut c: idle::Context) -> ! {
         // owned by `idle` == `&'static mut`
-        let _: &'static mut u32 = c.resources.O2;
+        let _: &'static mut u32 = c.resources.o2;
 
         // owned by `idle` == `&'static` if read-only
-        let _: &'static u32 = c.resources.O4;
+        let _: &'static u32 = c.resources.o4;
 
         // shared with `idle` == `Mutex`
-        c.resources.S1.lock(|_| {});
+        c.resources.s1.lock(|_| {});
 
         // `&` if read-only
-        let _: &u32 = c.resources.S3;
+        let _: &u32 = c.resources.s3;
 
         loop {}
     }
 
-    #[task(binds = UART0, resources = [O3, S1, S2, S3])]
+    #[task(binds = UART0, resources = [o3, s1, s2, &s3])]
     fn uart0(c: uart0::Context) {
         // owned by interrupt == `&mut`
-        let _: &mut u32 = c.resources.O3;
+        let _: &mut u32 = c.resources.o3;
 
         // no `Mutex` proxy when access from highest priority task
-        let _: &mut u32 = c.resources.S1;
+        let _: &mut u32 = c.resources.s1;
 
         // no `Mutex` proxy when co-owned by cooperative (same priority) tasks
-        let _: &mut u32 = c.resources.S2;
+        let _: &mut u32 = c.resources.s2;
 
         // `&` if read-only
-        let _: &u32 = c.resources.S3;
+        let _: &u32 = c.resources.s3;
     }
 
-    #[task(binds = UART1, resources = [S2, O5])]
+    #[task(binds = UART1, resources = [s2, &o5])]
     fn uart1(c: uart1::Context) {
         // owned by interrupt == `&` if read-only
-        let _: &u32 = c.resources.O5;
+        let _: &u32 = c.resources.o5;
 
         // no `Mutex` proxy when co-owned by cooperative (same priority) tasks
-        let _: &mut u32 = c.resources.S2;
+        let _: &mut u32 = c.resources.s2;
     }
 };
diff --git a/examples/types.rs b/examples/types.rs
index 3e9c7ea5..0c8097f3 100644
--- a/examples/types.rs
+++ b/examples/types.rs
@@ -11,7 +11,10 @@ use rtfm::cyccnt::Instant;
 
 #[rtfm::app(device = lm3s6965, peripherals = true, monotonic = rtfm::cyccnt::CYCCNT)]
 const APP: () = {
-    static mut SHARED: u32 = 0;
+    struct Resources {
+        #[init(0)]
+        shared: u32,
+    }
 
     #[init(schedule = [foo], spawn = [foo])]
     fn init(c: init::Context) {
@@ -31,18 +34,18 @@ const APP: () = {
         let _: svcall::Spawn = c.spawn;
     }
 
-    #[task(binds = UART0, resources = [SHARED], schedule = [foo], spawn = [foo])]
+    #[task(binds = UART0, resources = [shared], schedule = [foo], spawn = [foo])]
     fn uart0(c: uart0::Context) {
         let _: Instant = c.start;
-        let _: resources::SHARED = c.resources.SHARED;
+        let _: resources::shared = c.resources.shared;
         let _: uart0::Schedule = c.schedule;
         let _: uart0::Spawn = c.spawn;
     }
 
-    #[task(priority = 2, resources = [SHARED], schedule = [foo], spawn = [foo])]
+    #[task(priority = 2, resources = [shared], schedule = [foo], spawn = [foo])]
     fn foo(c: foo::Context) {
         let _: Instant = c.scheduled;
-        let _: &mut u32 = c.resources.SHARED;
+        let _: &mut u32 = c.resources.shared;
         let _: foo::Resources = c.resources;
         let _: foo::Schedule = c.schedule;
         let _: foo::Spawn = c.spawn;