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Closes https://github.com/rust-console/gba/issues/86

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Lokathor 2021-04-09 00:08:00 -06:00
parent 9bca85264f
commit 703c837a21
1 changed files with 12 additions and 0 deletions
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12
src/mmio_types.rs
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@ -13,14 +13,17 @@ pub(crate) use const_new;
/// Sets up a bitfield integer
macro_rules! bitfield_int {
($inner:ty; $low:literal ..= $high:literal : $nt:ident, $get:ident, $with:ident, $set:ident) => {
#[inline]
pub const fn $get(self) -> $nt {
const MASK: $inner = ((1 << $high) - 1) << $low;
((self.0 & MASK) >> $low) as $nt
}
#[inline]
pub const fn $with(self, $get: $nt) -> Self {
const MASK: $inner = ((1 << $high) - 1) << $low;
Self(self.0 ^ ((self.0 ^ ($get as $inner)) & MASK))
}
#[inline]
pub fn $set(&mut self, $get: $nt) {
*self = self.$with($get);
}
@ -31,14 +34,17 @@ pub(crate) use bitfield_int;
/// Sets up a bitfield int wrapped newtype
macro_rules! bitfield_newtype {
($inner:ty; $low:literal ..= $high:literal : $nt:ident, $get:ident, $with:ident, $set:ident) => {
#[inline]
pub const fn $get(self) -> $nt {
const MASK: $inner = ((1 << $high) - 1) << $low;
$nt(self.0 & MASK)
}
#[inline]
pub const fn $with(self, $get: $nt) -> Self {
const MASK: $inner = ((1 << $high) - 1) << $low;
Self(self.0 ^ ((self.0 ^ $get.0) & MASK))
}
#[inline]
pub fn $set(&mut self, $get: $nt) {
*self = self.$with($get);
}
@ -50,14 +56,17 @@ pub(crate) use bitfield_newtype;
macro_rules! bitfield_enum {
($inner:ty; $low:literal ..= $high:literal : $nt:ident, $get:ident, $with:ident, $set:ident) => {
// TODO: make this const when we have const transmute
#[inline]
pub fn $get(self) -> $nt {
const MASK: $inner = ((1 << $high) - 1) << $low;
unsafe { core::mem::transmute(self.0 & MASK) }
}
#[inline]
pub const fn $with(self, $get: $nt) -> Self {
const MASK: $inner = ((1 << $high) - 1) << $low;
Self(self.0 ^ ((self.0 ^ $get as $inner) & MASK))
}
#[inline]
pub fn $set(&mut self, $get: $nt) {
*self = self.$with($get);
}
@ -68,12 +77,15 @@ pub(crate) use bitfield_enum;
/// Sets up a bitfield bool
macro_rules! bitfield_bool {
($inner:ty; $bit:literal, $get:ident, $with:ident, $set:ident) => {
#[inline]
pub const fn $get(self) -> bool {
(self.0 & (1 << $bit)) != 0
}
#[inline]
pub const fn $with(self, $get: bool) -> Self {
Self(self.0 ^ ((($get as $inner).wrapping_neg() ^ self.0) & (1 << $bit)))
}
#[inline]
pub fn $set(&mut self, $get: bool) {
*self = self.$with($get);
}