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Replace runtime size check with compile time check #1000

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merged 1 commit into from
Jun 20, 2022
Merged

Replace runtime size check with compile time check #1000

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2 changes: 1 addition & 1 deletion src/consensus/encode.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -242,7 +242,7 @@ macro_rules! decoder_fn {
($name:ident, $val_type:ty, $readfn:ident, $byte_len: expr) => {
#[inline]
fn $name(&mut self) -> Result<$val_type, Error> {
debug_assert_eq!(::core::mem::size_of::<$val_type>(), $byte_len); // size_of isn't a constfn in 1.22
const_assert!(::core::mem::size_of::<$val_type>() == $byte_len);
let mut val = [0; $byte_len];
self.read_exact(&mut val[..]).map_err(Error::Io)?;
Ok(endian::$readfn(&val))
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9 changes: 9 additions & 0 deletions src/internal_macros.rs
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Expand Up @@ -593,3 +593,12 @@ macro_rules! write_err {
}
}
}

/// Asserts a boolean expression at compile time.
macro_rules! const_assert {
($x:expr) => {
{
const _: [(); 0 - !$x as usize] = [];
}
};
}
4 changes: 2 additions & 2 deletions src/util/endian.rs
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Expand Up @@ -28,7 +28,7 @@ macro_rules! define_be_to_array {
($name: ident, $type: ty, $byte_len: expr) => {
#[inline]
pub fn $name(val: $type) -> [u8; $byte_len] {
debug_assert_eq!(::core::mem::size_of::<$type>(), $byte_len); // size_of isn't a constfn in 1.22
const_assert!(::core::mem::size_of::<$type>() == $byte_len);
let mut res = [0; $byte_len];
for i in 0..$byte_len {
res[i] = ((val >> ($byte_len - i - 1)*8) & 0xff) as u8;
Expand All @@ -41,7 +41,7 @@ macro_rules! define_le_to_array {
($name: ident, $type: ty, $byte_len: expr) => {
#[inline]
pub fn $name(val: $type) -> [u8; $byte_len] {
debug_assert_eq!(::core::mem::size_of::<$type>(), $byte_len); // size_of isn't a constfn in 1.22
const_assert!(::core::mem::size_of::<$type>() == $byte_len);
let mut res = [0; $byte_len];
for i in 0..$byte_len {
res[i] = ((val >> i*8) & 0xff) as u8;
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