Take advantage of the fact that CriticalSection is Copy

agb/examples/output.rs

@@ -10,8 +10,8 @@ fn main(_gba: agb::Gba) -> ! {
     let count = Mutex::new(RefCell::new(0));
     let _a = agb::interrupt::add_interrupt_handler(
         agb::interrupt::Interrupt::VBlank,
-        |key: &CriticalSection| {
-            let mut count = count.borrow(*key).borrow_mut();
+        |key: CriticalSection| {
+            let mut count = count.borrow(key).borrow_mut();
             agb::println!("Hello, world, frame = {}", *count);
             *count += 1;
         },

agb/examples/wave.rs

@@ -31,8 +31,8 @@ fn main(mut gba: agb::Gba) -> ! {
 
     let back = Mutex::new(RefCell::new(BackCosines { cosines, row: 0 }));
 
-    let _a = agb::interrupt::add_interrupt_handler(Interrupt::HBlank, |key: &CriticalSection| {
-        let mut backc = back.borrow(*key).borrow_mut();
+    let _a = agb::interrupt::add_interrupt_handler(Interrupt::HBlank, |key: CriticalSection| {
+        let mut backc = back.borrow(key).borrow_mut();
         let deflection = backc.cosines[backc.row % 32];
         unsafe { ((0x0400_0010) as *mut u16).write_volatile(deflection) }
         backc.row += 1;
@@ -43,7 +43,7 @@ fn main(mut gba: agb::Gba) -> ! {
     loop {
         vblank.wait_for_vblank();
         free(|key| {
-            let mut backc = back.borrow(*key).borrow_mut();
+            let mut backc = back.borrow(key).borrow_mut();
             backc.row = 0;
             time += 1;
             for (r, a) in backc.cosines.iter_mut().enumerate() {

agb/src/agb_alloc/block_allocator.rs

@@ -61,7 +61,7 @@ impl BlockAllocator {
     #[cfg(test)]
     pub unsafe fn number_of_blocks(&self) -> u32 {
         free(|key| {
-            let mut state = self.state.borrow(*key).borrow_mut();
+            let mut state = self.state.borrow(key).borrow_mut();
 
             let mut count = 0;
 
@@ -76,7 +76,7 @@ impl BlockAllocator {
     }
 
     /// Requests a brand new block from the inner bump allocator
-    fn new_block(&self, layout: Layout, cs: &CriticalSection) -> Option<NonNull<u8>> {
+    fn new_block(&self, layout: Layout, cs: CriticalSection) -> Option<NonNull<u8>> {
         let overall_layout = Block::either_layout(layout);
         self.inner_allocator.alloc_critical(overall_layout, cs)
     }
@@ -84,7 +84,7 @@ impl BlockAllocator {
     /// Merges blocks together to create a normalised list
     unsafe fn normalise(&self) {
         free(|key| {
-            let mut state = self.state.borrow(*key).borrow_mut();
+            let mut state = self.state.borrow(key).borrow_mut();
 
             let mut list_ptr = &mut state.first_free_block;
 
@@ -121,7 +121,7 @@ impl BlockAllocator {
             .unwrap();
 
         free(|key| {
-            let mut state = self.state.borrow(*key).borrow_mut();
+            let mut state = self.state.borrow(key).borrow_mut();
             let mut current_block = state.first_free_block;
             let mut list_ptr = &mut state.first_free_block;
             // This iterates the free list until it either finds a block that
@@ -164,7 +164,7 @@ impl BlockAllocator {
     pub unsafe fn dealloc_no_normalise(&self, ptr: *mut u8, layout: Layout) {
         let new_layout = Block::either_layout(layout).pad_to_align();
         free(|key| {
-            let mut state = self.state.borrow(*key).borrow_mut();
+            let mut state = self.state.borrow(key).borrow_mut();
 
             // note that this is a reference to a pointer
             let mut list_ptr = &mut state.first_free_block;

agb/src/agb_alloc/bump_allocator.rs

@@ -26,13 +26,13 @@ impl BumpAllocator {
 }
 
 impl BumpAllocator {
-    pub fn alloc_critical(&self, layout: Layout, cs: &CriticalSection) -> Option<NonNull<u8>> {
-        let mut current_ptr = self.current_ptr.borrow(*cs).borrow_mut();
+    pub fn alloc_critical(&self, layout: Layout, cs: CriticalSection) -> Option<NonNull<u8>> {
+        let mut current_ptr = self.current_ptr.borrow(cs).borrow_mut();
 
         let ptr = if let Some(c) = *current_ptr {
             c.as_ptr() as usize
         } else {
-            (self.start_end.borrow(*cs).start)()
+            (self.start_end.borrow(cs).start)()
         };
 
         let alignment_bitmask = layout.align() - 1;
@@ -43,7 +43,7 @@ impl BumpAllocator {
         let resulting_ptr = ptr + amount_to_add;
         let new_current_ptr = resulting_ptr + layout.size();
 
-        if new_current_ptr as usize >= (self.start_end.borrow(*cs).end)() {
+        if new_current_ptr as usize >= (self.start_end.borrow(cs).end)() {
             return None;
         }
 

agb/src/display/object.rs

@@ -56,7 +56,7 @@ impl ObjectControllerRef {
         #[cfg(debug_assertions)]
         {
             let a = crate::interrupt::free(|c| {
-                let mut b = OBJECT_REFS_CURRENT.borrow(*c).borrow_mut();
+                let mut b = OBJECT_REFS_CURRENT.borrow(c).borrow_mut();
                 let a = *b;
                 *b += 1;
                 a
@@ -76,7 +76,7 @@ impl ObjectControllerRef {
 impl Drop for ObjectControllerRef {
     fn drop(&mut self) {
         crate::interrupt::free(|c| {
-            let mut b = OBJECT_REFS_CURRENT.borrow(*c).borrow_mut();
+            let mut b = OBJECT_REFS_CURRENT.borrow(c).borrow_mut();
             *b -= 1;
         })
     }

agb/src/hash_map.rs

@@ -59,7 +59,7 @@ type HashType = u32;
 
 /// A hash map implemented very simply using robin hood hashing.
 ///
-/// HashMap uses FxHasher internally, which is a very fast hashing algorithm used
+/// `HashMap` uses `FxHasher` internally, which is a very fast hashing algorithm used
 /// by rustc and firefox in non-adversarial places. It is incredibly fast, and good
 /// enough for most cases.
 ///
@@ -76,7 +76,7 @@ type HashType = u32;
 /// aborts, memory leaks and non-termination.
 ///
 /// The API surface provided is incredibly similar to the
-/// [std::collections::HashMap](https://doc.rust-lang.org/std/collections/struct.HashMap.html)
+/// [`std::collections::HashMap`](https://doc.rust-lang.org/std/collections/struct.HashMap.html)
 /// implementation with fewer guarantees, and better optimised for the GameBoy Advance.
 ///
 /// [`Eq`]: https://doc.rust-lang.org/core/cmp/trait.Eq.html

agb/src/interrupt.rs

@@ -157,17 +157,17 @@ extern "C" fn __RUST_INTERRUPT_HANDLER(interrupt: u16) -> u16 {
 struct InterruptInner {
     next: Cell<*const InterruptInner>,
     root: *const InterruptRoot,
-    closure: *const dyn Fn(&CriticalSection),
+    closure: *const dyn Fn(CriticalSection),
     _pin: PhantomPinned,
 }
 
 unsafe fn create_interrupt_inner(
-    c: impl Fn(&CriticalSection),
+    c: impl Fn(CriticalSection),
     root: *const InterruptRoot,
 ) -> Pin<Box<InterruptInner>> {
     let c = Box::new(c);
-    let c: &dyn Fn(&CriticalSection) = Box::leak(c);
-    let c: &dyn Fn(&CriticalSection) = core::mem::transmute(c);
+    let c: &dyn Fn(CriticalSection) = Box::leak(c);
+    let c: &dyn Fn(CriticalSection) = core::mem::transmute(c);
     Box::pin(InterruptInner {
         next: Cell::new(core::ptr::null()),
         root,
@@ -216,7 +216,7 @@ impl InterruptRoot {
         while !c.is_null() {
             let closure_ptr = unsafe { &*c }.closure;
             let closure_ref = unsafe { &*closure_ptr };
-            closure_ref(unsafe { &CriticalSection::new() });
+            closure_ref(unsafe { CriticalSection::new() });
             c = unsafe { &*c }.next.get();
         }
     }
@@ -241,7 +241,7 @@ fn interrupt_to_root(interrupt: Interrupt) -> &'static InterruptRoot {
 /// ```
 pub fn add_interrupt_handler<'a>(
     interrupt: Interrupt,
-    handler: impl Fn(&CriticalSection) + Send + Sync + 'a,
+    handler: impl Fn(CriticalSection) + Send + Sync + 'a,
 ) -> InterruptHandler<'a> {
     fn do_with_inner<'a>(
         interrupt: Interrupt,
@@ -282,13 +282,13 @@ pub fn add_interrupt_handler<'a>(
 /// [`CriticalSection`]: bare_metal::CriticalSection
 pub fn free<F, R>(f: F) -> R
 where
-    F: FnOnce(&CriticalSection) -> R,
+    F: FnOnce(CriticalSection) -> R,
 {
     let enabled = INTERRUPTS_ENABLED.get();
 
     disable_interrupts();
 
-    let r = f(unsafe { &CriticalSection::new() });
+    let r = f(unsafe { CriticalSection::new() });
 
     INTERRUPTS_ENABLED.set(enabled);
     r
@@ -328,17 +328,17 @@ mod tests {
         {
             let counter = Mutex::new(RefCell::new(0));
             let counter_2 = Mutex::new(RefCell::new(0));
-            let _a = add_interrupt_handler(Interrupt::VBlank, |key: &CriticalSection| {
-                *counter.borrow(*key).borrow_mut() += 1
+            let _a = add_interrupt_handler(Interrupt::VBlank, |key: CriticalSection| {
+                *counter.borrow(key).borrow_mut() += 1
             });
-            let _b = add_interrupt_handler(Interrupt::VBlank, |key: &CriticalSection| {
-                *counter_2.borrow(*key).borrow_mut() += 1
+            let _b = add_interrupt_handler(Interrupt::VBlank, |key: CriticalSection| {
+                *counter_2.borrow(key).borrow_mut() += 1
             });
 
             let vblank = VBlank::get();
 
             while free(|key| {
-                *counter.borrow(*key).borrow() < 100 || *counter_2.borrow(*key).borrow() < 100
+                *counter.borrow(key).borrow() < 100 || *counter_2.borrow(key).borrow() < 100
             }) {
                 vblank.wait_for_vblank();
             }
@@ -375,7 +375,7 @@ pub fn profiler(timer: &mut crate::timer::Timer, period: u16) -> InterruptHandle
     timer.set_overflow_amount(period);
     timer.set_enabled(true);
 
-    add_interrupt_handler(timer.interrupt(), |_key: &CriticalSection| {
+    add_interrupt_handler(timer.interrupt(), |_key: CriticalSection| {
         crate::println!("{:#010x}", crate::program_counter_before_interrupt());
     })
 }

agb/src/rng.rs

@@ -55,7 +55,7 @@ static GLOBAL_RNG: Mutex<RefCell<RandomNumberGenerator>> =
 
 /// Using a global random number generator, provides the next random number
 pub fn gen() -> i32 {
-    free(|cs| GLOBAL_RNG.borrow(*cs).borrow_mut().gen())
+    free(|cs| GLOBAL_RNG.borrow(cs).borrow_mut().gen())
 }
 
 #[cfg(test)]

agb/src/sound/mixer/sw_mixer.rs

@@ -216,11 +216,11 @@ impl MixerBuffer {
     }
 
     fn should_calculate(&self) -> bool {
-        free(|cs| self.state.borrow(*cs).borrow().should_calculate())
+        free(|cs| self.state.borrow(cs).borrow().should_calculate())
     }
 
-    fn swap(&self, cs: &CriticalSection) {
-        let buffer = self.state.borrow(*cs).borrow_mut().playing_advanced();
+    fn swap(&self, cs: CriticalSection) {
+        let buffer = self.state.borrow(cs).borrow_mut().playing_advanced();
 
         let (left_buffer, right_buffer) = self.buffers[buffer]
             .0
@@ -282,7 +282,7 @@ impl MixerBuffer {
             channel.pos += playback_speed * constants::SOUND_BUFFER_SIZE;
         }
 
-        let write_buffer_index = free(|cs| self.state.borrow(*cs).borrow_mut().active_advanced());
+        let write_buffer_index = free(|cs| self.state.borrow(cs).borrow_mut().active_advanced());
 
         let write_buffer = &mut self.buffers[write_buffer_index].0;
         cpu_fast_fill_i8(write_buffer, 0);