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Slightly reorganise serialize code

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Brian Carroll 2021-11-02 20:35:29 +00:00
parent b0aeafc066
commit 7a1b5ecc99
1 changed files with 46 additions and 46 deletions
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92
compiler/gen_wasm/src/serialize.rs
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@ -2,6 +2,52 @@ use std::fmt::Debug;
use bumpalo::collections::vec::Vec;
pub trait Serialize {
fn serialize<T: SerialBuffer>(&self, buffer: &mut T);
}
impl Serialize for str {
fn serialize<T: SerialBuffer>(&self, buffer: &mut T) {
buffer.encode_u32(self.len() as u32);
buffer.append_slice(self.as_bytes());
}
}
impl Serialize for u32 {
fn serialize<T: SerialBuffer>(&self, buffer: &mut T) {
buffer.encode_u32(*self);
}
}
// Unit is used as a placeholder in parts of the Wasm spec we don't use yet
impl Serialize for () {
fn serialize<T: SerialBuffer>(&self, _buffer: &mut T) {}
}
impl<S: Serialize> Serialize for [S] {
fn serialize<T: SerialBuffer>(&self, buffer: &mut T) {
buffer.encode_u32(self.len() as u32);
for item in self.iter() {
item.serialize(buffer);
}
}
}
impl<S: Serialize> Serialize for Option<S> {
/// serialize Option as a vector of length 1 or 0
fn serialize<T: SerialBuffer>(&self, buffer: &mut T) {
match self {
Some(x) => {
buffer.append_u8(1);
x.serialize(buffer);
}
None => {
buffer.append_u8(0);
}
}
}
}
/// Write an unsigned integer into the provided buffer in LEB-128 format, returning byte length
///
/// All integers in Wasm are variable-length encoded, which saves space for small values.
@ -105,52 +151,6 @@ pub trait SerialBuffer: Debug {
encode_padded_sleb128!(encode_padded_i64, i64);
}
pub trait Serialize {
fn serialize<T: SerialBuffer>(&self, buffer: &mut T);
}
impl Serialize for str {
fn serialize<T: SerialBuffer>(&self, buffer: &mut T) {
buffer.encode_u32(self.len() as u32);
buffer.append_slice(self.as_bytes());
}
}
impl Serialize for u32 {
fn serialize<T: SerialBuffer>(&self, buffer: &mut T) {
buffer.encode_u32(*self);
}
}
// Unit is used as a placeholder in parts of the Wasm spec we don't use yet
impl Serialize for () {
fn serialize<T: SerialBuffer>(&self, _buffer: &mut T) {}
}
impl<S: Serialize> Serialize for [S] {
fn serialize<T: SerialBuffer>(&self, buffer: &mut T) {
buffer.encode_u32(self.len() as u32);
for item in self.iter() {
item.serialize(buffer);
}
}
}
impl<S: Serialize> Serialize for Option<S> {
/// serialize Option as a vector of length 1 or 0
fn serialize<T: SerialBuffer>(&self, buffer: &mut T) {
match self {
Some(x) => {
buffer.append_u8(1);
x.serialize(buffer);
}
None => {
buffer.append_u8(0);
}
}
}
}
fn overwrite_padded_u32_help(buffer: &mut [u8], value: u32) {
let mut x = value;
for byte in buffer.iter_mut().take(4) {