diff options
Diffstat (limited to 'compiler/rustc_serialize/src/leb128.rs')
| -rw-r--r-- | compiler/rustc_serialize/src/leb128.rs | 21 |
1 files changed, 9 insertions, 12 deletions
diff --git a/compiler/rustc_serialize/src/leb128.rs b/compiler/rustc_serialize/src/leb128.rs index 08b3c0542..7dad9aa01 100644 --- a/compiler/rustc_serialize/src/leb128.rs +++ b/compiler/rustc_serialize/src/leb128.rs @@ -1,22 +1,19 @@ -#![macro_use] - -macro_rules! max_leb128_len { - ($int_ty:ty) => { - // The longest LEB128 encoding for an integer uses 7 bits per byte. - (std::mem::size_of::<$int_ty>() * 8 + 6) / 7 - }; +/// Returns the length of the longest LEB128 encoding for `T`, assuming `T` is an integer type +pub const fn max_leb128_len<T>() -> usize { + // The longest LEB128 encoding for an integer uses 7 bits per byte. + (std::mem::size_of::<T>() * 8 + 6) / 7 } -// Returns the longest LEB128 encoding of all supported integer types. -pub const fn max_leb128_len() -> usize { - max_leb128_len!(u128) +/// Returns the length of the longest LEB128 encoding of all supported integer types. +pub const fn largest_max_leb128_len() -> usize { + max_leb128_len::<u128>() } macro_rules! impl_write_unsigned_leb128 { ($fn_name:ident, $int_ty:ty) => { #[inline] pub fn $fn_name( - out: &mut [::std::mem::MaybeUninit<u8>; max_leb128_len!($int_ty)], + out: &mut [::std::mem::MaybeUninit<u8>; max_leb128_len::<$int_ty>()], mut value: $int_ty, ) -> &[u8] { let mut i = 0; @@ -90,7 +87,7 @@ macro_rules! impl_write_signed_leb128 { ($fn_name:ident, $int_ty:ty) => { #[inline] pub fn $fn_name( - out: &mut [::std::mem::MaybeUninit<u8>; max_leb128_len!($int_ty)], + out: &mut [::std::mem::MaybeUninit<u8>; max_leb128_len::<$int_ty>()], mut value: $int_ty, ) -> &[u8] { let mut i = 0; |