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runtime/rpc: fixes alignment and size problem

This commit is contained in:
pca006132 2022-01-04 18:25:53 +08:00
parent efe315c21d
commit 8788d6458e
1 changed files with 77 additions and 21 deletions
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98
src/runtime/src/rpc.rs
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@ -14,15 +14,20 @@ use io::proto::ProtoWrite;
use crate::proto_async;
use self::tag::{Tag, TagIterator, split_tag};
#[inline]
fn alignment_offset(alignment: isize, ptr: isize) -> isize {
(alignment - ptr % alignment) % alignment
}
unsafe fn align_ptr<T>(ptr: *const ()) -> *const T {
let alignment = core::mem::align_of::<T>() as isize;
let fix = (alignment - (ptr as isize) % alignment) % alignment;
let fix = alignment_offset(alignment, ptr as isize);
((ptr as isize) + fix) as *const T
}
unsafe fn align_ptr_mut<T>(ptr: *mut ()) -> *mut T {
let alignment = core::mem::align_of::<T>() as isize;
let fix = (alignment - (ptr as isize) % alignment) % alignment;
let fix = alignment_offset(alignment, ptr as isize);
((ptr as isize) + fix) as *mut T
}
@ -66,6 +71,7 @@ async unsafe fn recv_value<F>(stream: &TcpStream, tag: Tag<'async_recursion>, da
})
}
Tag::Tuple(it, arity) => {
*data = (*data).offset(alignment_offset(tag.alignment() as isize, *data as isize));
let mut it = it.clone();
for _ in 0..arity {
let tag = it.next().expect("truncated tag");
@ -80,17 +86,24 @@ async unsafe fn recv_value<F>(stream: &TcpStream, tag: Tag<'async_recursion>, da
let length = proto_async::read_i32(stream).await? as usize;
(*ptr).length = length as u32;
let tag = it.clone().next().expect("truncated tag");
let mut data = alloc(tag.size() * length as usize).await;
let data_size = tag.size() * length as usize +
match tag {
Tag::Int64 | Tag::Float64 => 4,
_ => 0
};
let mut data = alloc(data_size).await;
let alignment = tag.alignment();
data = data.offset(alignment_offset(alignment as isize, data as isize));
(*ptr).elements = data;
match tag {
Tag::Bool => {
let ptr = align_ptr_mut::<u8>(data);
let ptr = data as *mut u8;
let dest = core::slice::from_raw_parts_mut(ptr, length);
proto_async::read_chunk(stream, dest).await?;
},
Tag::Int32 => {
let ptr = align_ptr_mut::<u32>(data);
let ptr = data as *mut u32;
// reading as raw bytes and do endianness conversion later
let dest = core::slice::from_raw_parts_mut(ptr as *mut u8, length * 4);
proto_async::read_chunk(stream, dest).await?;
@ -99,7 +112,7 @@ async unsafe fn recv_value<F>(stream: &TcpStream, tag: Tag<'async_recursion>, da
NativeEndian::from_slice_u32(dest);
},
Tag::Int64 | Tag::Float64 => {
let ptr = align_ptr_mut::<u64>(data);
let ptr = data as *mut u64;
let dest = core::slice::from_raw_parts_mut(ptr as *mut u8, length * 8);
proto_async::read_chunk(stream, dest).await?;
drop(dest);
@ -125,18 +138,25 @@ async unsafe fn recv_value<F>(stream: &TcpStream, tag: Tag<'async_recursion>, da
}
let elt_tag = it.clone().next().expect("truncated tag");
*buffer = alloc(elt_tag.size() * total_len as usize).await;
let data_size = elt_tag.size() * total_len as usize +
match elt_tag {
Tag::Int64 | Tag::Float64 => 4,
_ => 0
};
let mut data = alloc(data_size).await;
let alignment = tag.alignment();
data = data.offset(alignment_offset(alignment as isize, data as isize));
*buffer = data;
let length = total_len as usize;
let mut data = *buffer;
match elt_tag {
Tag::Bool => {
let ptr = align_ptr_mut::<u8>(data);
let ptr = data as *mut u8;
let dest = core::slice::from_raw_parts_mut(ptr, length);
proto_async::read_chunk(stream, dest).await?;
},
Tag::Int32 => {
let ptr = align_ptr_mut::<u32>(data);
let ptr = data as *mut u32;
let dest = core::slice::from_raw_parts_mut(ptr as *mut u8, length * 4);
proto_async::read_chunk(stream, dest).await?;
drop(dest);
@ -144,7 +164,7 @@ async unsafe fn recv_value<F>(stream: &TcpStream, tag: Tag<'async_recursion>, da
NativeEndian::from_slice_u32(dest);
},
Tag::Int64 | Tag::Float64 => {
let ptr = align_ptr_mut::<u64>(data);
let ptr = data as *mut u64;
let dest = core::slice::from_raw_parts_mut(ptr as *mut u8, length * 8);
proto_async::read_chunk(stream, dest).await?;
drop(dest);
@ -161,6 +181,7 @@ async unsafe fn recv_value<F>(stream: &TcpStream, tag: Tag<'async_recursion>, da
})
}
Tag::Range(it) => {
*data = (*data).offset(alignment_offset(tag.alignment() as isize, *data as isize));
let tag = it.clone().next().expect("truncated tag");
recv_value(stream, tag, data, alloc).await?;
recv_value(stream, tag, data, alloc).await?;
@ -407,7 +428,35 @@ mod tag {
}
}
pub fn alignment(self) -> usize {
use cslice::CSlice;
match self {
Tag::None => 1,
Tag::Bool => core::mem::align_of::<u8>(),
Tag::Int32 => core::mem::align_of::<i32>(),
Tag::Int64 => core::mem::align_of::<i64>(),
Tag::Float64 => core::mem::align_of::<f64>(),
// struct type: align to largest element
Tag::Tuple(it, arity) => {
let it = it.clone();
it.take(arity.into()).map(|t| t.alignment()).max().unwrap()
},
Tag::Range(it) => {
let it = it.clone();
it.take(3).map(|t| t.alignment()).max().unwrap()
}
// CSlice basically
Tag::Bytes | Tag::String | Tag::ByteArray | Tag::List(_) =>
core::mem::align_of::<CSlice<()>>(),
// array buffer is allocated, so no need for alignment first
Tag::Array(_, _) => 1,
// will not be sent from the host
_ => unreachable!("unexpected tag from host")
}
}
pub fn size(self) -> usize {
use super::alignment_offset;
match self {
Tag::None => 0,
Tag::Bool => 1,
@ -423,6 +472,8 @@ mod tag {
for _ in 0..arity {
let tag = it.next().expect("truncated tag");
size += tag.size();
// includes padding
size += alignment_offset(tag.alignment() as isize, size as isize) as usize;
}
size
}
@ -445,10 +496,23 @@ mod tag {
impl<'a> TagIterator<'a> {
pub fn new(data: &'a [u8]) -> TagIterator<'a> {
TagIterator { data: data }
TagIterator { data }
}
pub fn next(&mut self) -> Option<Tag<'a>> {
fn sub(&mut self, count: u8) -> TagIterator<'a> {
let data = self.data;
for _ in 0..count {
self.next().expect("truncated tag");
}
TagIterator { data: &data[..(data.len() - self.data.len())] }
}
}
impl<'a> core::iter::Iterator for TagIterator<'a> {
type Item = Tag<'a>;
fn next(&mut self) -> Option<Tag<'a>> {
if self.data.len() == 0 {
return None
}
@ -481,14 +545,6 @@ mod tag {
_ => unreachable!()
})
}
fn sub(&mut self, count: u8) -> TagIterator<'a> {
let data = self.data;
for _ in 0..count {
self.next().expect("truncated tag");
}
TagIterator { data: &data[..(data.len() - self.data.len())] }
}
}
impl<'a> fmt::Display for TagIterator<'a> {