diff options
Diffstat (limited to 'compiler/rustc_serialize/src/opaque.rs')
| -rw-r--r-- | compiler/rustc_serialize/src/opaque.rs | 153 |
1 files changed, 51 insertions, 102 deletions
diff --git a/compiler/rustc_serialize/src/opaque.rs b/compiler/rustc_serialize/src/opaque.rs index a2ec318df6d..6b559cb5b2f 100644 --- a/compiler/rustc_serialize/src/opaque.rs +++ b/compiler/rustc_serialize/src/opaque.rs @@ -265,52 +265,41 @@ impl Drop for FileEncoder { } } -macro_rules! file_encoder_write_leb128 { - ($enc:expr, $value:expr, $int_ty:ty, $fun:ident) => {{ - const MAX_ENCODED_LEN: usize = $crate::leb128::max_leb128_len::<$int_ty>(); +macro_rules! write_leb128 { + ($this_fn:ident, $int_ty:ty, $write_leb_fn:ident) => { + #[inline] + fn $this_fn(&mut self, v: $int_ty) { + const MAX_ENCODED_LEN: usize = $crate::leb128::max_leb128_len::<$int_ty>(); - // We ensure this during `FileEncoder` construction. - debug_assert!($enc.capacity() >= MAX_ENCODED_LEN); + // We ensure this during `FileEncoder` construction. + debug_assert!(self.capacity() >= MAX_ENCODED_LEN); - let mut buffered = $enc.buffered; + let mut buffered = self.buffered; - // This can't overflow. See assertion in `FileEncoder::with_capacity`. - if std::intrinsics::unlikely(buffered + MAX_ENCODED_LEN > $enc.capacity()) { - $enc.flush(); - buffered = 0; - } + // This can't overflow. See assertion in `FileEncoder::with_capacity`. + if std::intrinsics::unlikely(buffered + MAX_ENCODED_LEN > self.capacity()) { + self.flush(); + buffered = 0; + } - // SAFETY: The above check and flush ensures that there is enough - // room to write the encoded value to the buffer. - let buf = unsafe { - &mut *($enc.buf.as_mut_ptr().add(buffered) as *mut [MaybeUninit<u8>; MAX_ENCODED_LEN]) - }; + // SAFETY: The above check and flush ensures that there is enough + // room to write the encoded value to the buffer. + let buf = unsafe { + &mut *(self.buf.as_mut_ptr().add(buffered) + as *mut [MaybeUninit<u8>; MAX_ENCODED_LEN]) + }; - let encoded = leb128::$fun(buf, $value); - $enc.buffered = buffered + encoded.len(); - }}; + let encoded = leb128::$write_leb_fn(buf, v); + self.buffered = buffered + encoded.len(); + } + }; } impl Encoder for FileEncoder { - #[inline] - fn emit_usize(&mut self, v: usize) { - file_encoder_write_leb128!(self, v, usize, write_usize_leb128) - } - - #[inline] - fn emit_u128(&mut self, v: u128) { - file_encoder_write_leb128!(self, v, u128, write_u128_leb128) - } - - #[inline] - fn emit_u64(&mut self, v: u64) { - file_encoder_write_leb128!(self, v, u64, write_u64_leb128) - } - - #[inline] - fn emit_u32(&mut self, v: u32) { - file_encoder_write_leb128!(self, v, u32, write_u32_leb128) - } + write_leb128!(emit_usize, usize, write_usize_leb128); + write_leb128!(emit_u128, u128, write_u128_leb128); + write_leb128!(emit_u64, u64, write_u64_leb128); + write_leb128!(emit_u32, u32, write_u32_leb128); #[inline] fn emit_u16(&mut self, v: u16) { @@ -322,25 +311,10 @@ impl Encoder for FileEncoder { self.write_one(v); } - #[inline] - fn emit_isize(&mut self, v: isize) { - file_encoder_write_leb128!(self, v, isize, write_isize_leb128) - } - - #[inline] - fn emit_i128(&mut self, v: i128) { - file_encoder_write_leb128!(self, v, i128, write_i128_leb128) - } - - #[inline] - fn emit_i64(&mut self, v: i64) { - file_encoder_write_leb128!(self, v, i64, write_i64_leb128) - } - - #[inline] - fn emit_i32(&mut self, v: i32) { - file_encoder_write_leb128!(self, v, i32, write_i32_leb128) - } + write_leb128!(emit_isize, isize, write_isize_leb128); + write_leb128!(emit_i128, i128, write_i128_leb128); + write_leb128!(emit_i64, i64, write_i64_leb128); + write_leb128!(emit_i32, i32, write_i32_leb128); #[inline] fn emit_i16(&mut self, v: i16) { @@ -437,30 +411,19 @@ impl<'a> MemDecoder<'a> { } macro_rules! read_leb128 { - ($dec:expr, $fun:ident) => {{ leb128::$fun($dec) }}; + ($this_fn:ident, $int_ty:ty, $read_leb_fn:ident) => { + #[inline] + fn $this_fn(&mut self) -> $int_ty { + leb128::$read_leb_fn(self) + } + }; } impl<'a> Decoder for MemDecoder<'a> { - #[inline] - fn position(&self) -> usize { - // SAFETY: This type guarantees start <= current - unsafe { self.current.sub_ptr(self.start) } - } - - #[inline] - fn read_u128(&mut self) -> u128 { - read_leb128!(self, read_u128_leb128) - } - - #[inline] - fn read_u64(&mut self) -> u64 { - read_leb128!(self, read_u64_leb128) - } - - #[inline] - fn read_u32(&mut self) -> u32 { - read_leb128!(self, read_u32_leb128) - } + read_leb128!(read_usize, usize, read_usize_leb128); + read_leb128!(read_u128, u128, read_u128_leb128); + read_leb128!(read_u64, u64, read_u64_leb128); + read_leb128!(read_u32, u32, read_u32_leb128); #[inline] fn read_u16(&mut self) -> u16 { @@ -480,25 +443,10 @@ impl<'a> Decoder for MemDecoder<'a> { } } - #[inline] - fn read_usize(&mut self) -> usize { - read_leb128!(self, read_usize_leb128) - } - - #[inline] - fn read_i128(&mut self) -> i128 { - read_leb128!(self, read_i128_leb128) - } - - #[inline] - fn read_i64(&mut self) -> i64 { - read_leb128!(self, read_i64_leb128) - } - - #[inline] - fn read_i32(&mut self) -> i32 { - read_leb128!(self, read_i32_leb128) - } + read_leb128!(read_isize, isize, read_isize_leb128); + read_leb128!(read_i128, i128, read_i128_leb128); + read_leb128!(read_i64, i64, read_i64_leb128); + read_leb128!(read_i32, i32, read_i32_leb128); #[inline] fn read_i16(&mut self) -> i16 { @@ -506,11 +454,6 @@ impl<'a> Decoder for MemDecoder<'a> { } #[inline] - fn read_isize(&mut self) -> isize { - read_leb128!(self, read_isize_leb128) - } - - #[inline] fn read_raw_bytes(&mut self, bytes: usize) -> &'a [u8] { if bytes > self.remaining() { Self::decoder_exhausted(); @@ -532,6 +475,12 @@ impl<'a> Decoder for MemDecoder<'a> { // Since we just checked current == end, the current pointer must be inbounds. unsafe { *self.current } } + + #[inline] + fn position(&self) -> usize { + // SAFETY: This type guarantees start <= current + unsafe { self.current.sub_ptr(self.start) } + } } // Specializations for contiguous byte sequences follow. The default implementations for slices |