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proc_macro: stop using LEB128 for RPC. #59820

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Apr 13, 2019
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proc_macro: stop using LEB128 for RPC. #59820

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36 changes: 13 additions & 23 deletions src/libproc_macro/bridge/rpc.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -24,32 +24,22 @@ pub(super) trait DecodeMut<'a, 's, S>: Sized {
}

macro_rules! rpc_encode_decode {
(uleb128 $ty:ty) => {
(le $ty:ty) => {
impl<S> Encode<S> for $ty {
fn encode(mut self, w: &mut Writer, s: &mut S) {
let mut byte = 0x80;
while byte & 0x80 != 0 {
byte = (self & 0x7f) as u8;
self >>= 7;
if self != 0 {
byte |= 0x80;
}
byte.encode(w, s);
}
fn encode(self, w: &mut Writer, _: &mut S) {
w.write_all(&self.to_le_bytes()).unwrap();
}
}

impl<S> DecodeMut<'_, '_, S> for $ty {
fn decode(r: &mut Reader<'_>, s: &mut S) -> Self {
let mut byte = 0x80;
let mut v = 0;
let mut shift = 0;
while byte & 0x80 != 0 {
byte = u8::decode(r, s);
v |= ((byte & 0x7f) as Self) << shift;
shift += 7;
}
v
fn decode(r: &mut Reader<'_>, _: &mut S) -> Self {
const N: usize = ::std::mem::size_of::<$ty>();

let mut bytes = [0; N];
bytes.copy_from_slice(&r[..N]);
*r = &r[N..];

Self::from_le_bytes(bytes)
}
}
};
Expand Down Expand Up @@ -136,8 +126,8 @@ impl<S> DecodeMut<'_, '_, S> for u8 {
}
}

rpc_encode_decode!(uleb128 u32);
rpc_encode_decode!(uleb128 usize);
rpc_encode_decode!(le u32);
rpc_encode_decode!(le usize);

impl<S> Encode<S> for bool {
fn encode(self, w: &mut Writer, s: &mut S) {
Expand Down