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/target
/test
Cargo.lock

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[package]
name = "wlausam"
version = "0.1.0"
edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
parity-wasm = "0.42.2"

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This is a WIP (read: absolutely not ready for serious work) tool for translating WebAssembly into Lua. Support is specifically for LuaJIT, with the secondary objective being Lua 5.4 and Roblox's Luau.
The instructions are minimal; run the program as `program <edition> <file...>` to generate the translations into stdout. Editions currently supported are `LuaJIT` and `Luau`.

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local bit = require('bit')
local ffi = require('ffi')
local unsign_i64 = ffi.typeof('uint64_t')
local div = {}
local le = {}
local lt = {}
local ge = {}
local gt = {}
local band = {}
local bor = {}
local bxor = {}
local bnot = {}
local shl = {}
local shr = {}
local extend = {}
local wrap = {}
local load = {}
local store = {}
-- Helper functions
local function unsign_i32(x)
if x < 0 then x = x + 0x100000000 end
return x
end
local function rip_u64(x) return bit.band(bit.rshift(x, 32), 0xFFFFFFFF), bit.band(x, 0xFFFFFFFF) end
local function merge_u64(hi, lo) return bit.bor(bit.lshift(hi, 32), lo) end
-- Runtime functions
local function grow_page_num(memory, num)
local old = memory.min
local new = old + num
if memory.max and new > memory.max then
return -1
else
memory.min = new
return old
end
end
function div.i32(lhs, rhs)
if rhs == 0 then error('division by zero') end
return math.floor(lhs / rhs)
end
function le.u32(lhs, rhs) return unsign_i32(lhs) <= unsign_i32(rhs) and 1 or 0 end
function lt.u32(lhs, rhs) return unsign_i32(lhs) < unsign_i32(rhs) and 1 or 0 end
function ge.u32(lhs, rhs) return unsign_i32(lhs) >= unsign_i32(rhs) and 1 or 0 end
function gt.u32(lhs, rhs) return unsign_i32(lhs) > unsign_i32(rhs) and 1 or 0 end
function le.u64(lhs, rhs) return unsign_i64(lhs) <= unsign_i64(rhs) and 1 or 0 end
function lt.u64(lhs, rhs) return unsign_i64(lhs) < unsign_i64(rhs) and 1 or 0 end
function ge.u64(lhs, rhs) return unsign_i64(lhs) >= unsign_i64(rhs) and 1 or 0 end
function gt.u64(lhs, rhs) return unsign_i64(lhs) > unsign_i64(rhs) and 1 or 0 end
band.i32 = bit.band
bor.i32 = bit.bor
bxor.i32 = bit.bxor
bnot.i32 = bit.bnot
band.i64 = bit.band
bor.i64 = bit.bor
bxor.i64 = bit.bxor
bnot.i64 = bit.bnot
shl.u32 = bit.lshift
shr.u32 = bit.rshift
shl.i32 = bit.lshift
shr.i32 = bit.rshift
shl.u64 = bit.lshift
shr.u64 = bit.rshift
shl.i64 = bit.lshift
shr.i64 = bit.rshift
extend.i32_u64 = ffi.typeof('int64_t')
wrap.i64_i32 = ffi.typeof('int32_t')
function load.i32(memory, addr)
if addr % 4 ~= 0 then error('unaligned read') end
return memory.data[addr / 4] or 0
end
function load.i32_u8(memory, addr)
local value = load.i32(memory, addr)
return bit.band(value, 0xFF)
end
function load.i64(memory, addr)
if addr % 4 ~= 0 then error('unaligned read') end
local hi = memory.data[addr / 4 + 1] or 0
local lo = memory.data[addr / 4] or 0
return merge_u64(hi, lo)
end
function store.i32(memory, addr, value)
if addr % 4 ~= 0 then error('unaligned write') end
memory.data[addr / 4] = value
end
function store.i32_n8(memory, addr, value)
if addr % 4 ~= 0 then error('unaligned write') end
local old = bit.band(memory.data[addr / 4] or 0, 0xFFFFFF00)
local new = bit.band(value, 0xFF)
memory.data[addr / 4] = bit.bor(old, new)
end
function store.i64(memory, addr, value)
if addr % 4 ~= 0 then error('unaligned write') end
local hi, lo = rip_u64(value)
memory.data[addr / 4] = lo
memory.data[addr / 4 + 1] = hi
end
return {
grow_page_num = grow_page_num,
div = div,
le = le,
lt = lt,
ge = ge,
gt = gt,
band = band,
bor = bor,
bxor = bxor,
bnot = bnot,
shl = shl,
shr = shr,
extend = extend,
wrap = wrap,
load = load,
store = store,
}

161
runtime/luau.lua Normal file
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local div = {}
local le = {}
local lt = {}
local ge = {}
local gt = {}
local band = {}
local bor = {}
local bxor = {}
local bnot = {}
local shl = {}
local shr = {}
local extend = {}
local wrap = {}
local load = {}
local store = {}
-- Helper functions
local function no_op(x) return x end
local function unsign_i32(x)
if x < 0 then x = x + 0x100000000 end
return x
end
local function unsign_i64(x)
if x < 0 then x = x + 0x10000000000000000 end
return x
end
local function rip_u64(x) return math.floor(x / 0x100000000), bit.tobit(x % 0x100000000) end
local function merge_u64(hi, lo) return hi * 0x100000000 + lo end
-- Runtime functions
local function grow_page_num(memory, num)
local old = memory.min
local new = old + num
if memory.max and new > memory.max then
return -1
else
memory.min = new
return old
end
end
function div.i32(lhs, rhs)
if rhs == 0 then error('division by zero') end
return math.floor(lhs / rhs)
end
function le.u32(lhs, rhs) return unsign_i32(lhs) <= unsign_i32(rhs) and 1 or 0 end
function lt.u32(lhs, rhs) return unsign_i32(lhs) < unsign_i32(rhs) and 1 or 0 end
function ge.u32(lhs, rhs) return unsign_i32(lhs) >= unsign_i32(rhs) and 1 or 0 end
function gt.u32(lhs, rhs) return unsign_i32(lhs) > unsign_i32(rhs) and 1 or 0 end
function le.u64(lhs, rhs) return unsign_i64(lhs) <= unsign_i64(rhs) and 1 or 0 end
function lt.u64(lhs, rhs) return unsign_i64(lhs) < unsign_i64(rhs) and 1 or 0 end
function ge.u64(lhs, rhs) return unsign_i64(lhs) >= unsign_i64(rhs) and 1 or 0 end
function gt.u64(lhs, rhs) return unsign_i64(lhs) > unsign_i64(rhs) and 1 or 0 end
band.i32 = bit.band
bor.i32 = bit.bor
bxor.i32 = bit.bxor
bnot.i32 = bit.bnot
band.i64 = bit.band
bor.i64 = bit.bor
bxor.i64 = bit.bxor
bnot.i64 = bit.bnot
shl.u32 = bit.lshift
shr.u32 = bit.rshift
shl.i32 = bit.lshift
shr.i32 = bit.rshift
shl.u64 = bit.lshift
shr.u64 = bit.rshift
shl.i64 = bit.lshift
shr.i64 = bit.rshift
extend.i32_u64 = no_op
function wrap.i64_i32(i) return i % 2 ^ 32 end
function load.i32(memory, addr)
if addr % 4 ~= 0 then error('unaligned read') end
return memory.data[addr / 4] or 0
end
function load.i32_u8(memory, addr)
local value = load.i32(memory, addr)
return bit.band(value, 0xFF)
end
function load.i64(memory, addr)
if addr % 4 ~= 0 then error('unaligned read') end
local hi = memory.data[addr / 4 + 1] or 0
local lo = memory.data[addr / 4] or 0
return merge_u64(hi, lo)
end
function store.i32(memory, addr, value)
if addr % 4 ~= 0 then error('unaligned write') end
memory.data[addr / 4] = value
end
function store.i32_n8(memory, addr, value)
if addr % 4 ~= 0 then error('unaligned write') end
local old = bit.band(memory.data[addr / 4] or 0, 0xFFFFFF00)
local new = bit.band(value, 0xFF)
memory.data[addr / 4] = bit.bor(old, new)
end
function store.i64(memory, addr, value)
if addr % 4 ~= 0 then error('unaligned write') end
local hi, lo = rip_u64(value)
memory.data[addr / 4] = lo
memory.data[addr / 4 + 1] = hi
end
return {
grow_page_num = grow_page_num,
div = div,
le = le,
lt = lt,
ge = ge,
gt = gt,
band = band,
bor = bor,
bxor = bxor,
bnot = bnot,
shl = shl,
shr = shr,
extend = extend,
wrap = wrap,
load = load,
store = store,
}

1
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hard_tabs = true

153
src/backend/helper/edition.rs Executable file
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use super::writer::Writer;
use std::{fmt::Display, io::Result};
pub struct Infix<T> {
rhs: &'static str,
inner: T,
}
impl<T> Display for Infix<T>
where
T: Display,
{
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
self.inner.fmt(f)?;
self.rhs.fmt(f)
}
}
pub trait Edition {
fn runtime(&self) -> &'static str;
fn start_block(&self, w: Writer) -> Result<()>;
fn start_loop(&self, level: usize, w: Writer) -> Result<()>;
fn start_if(&self, cond: &str, w: Writer) -> Result<()>;
fn end_block(&self, level: usize, w: Writer) -> Result<()>;
fn end_loop(&self, w: Writer) -> Result<()>;
fn end_if(&self, level: usize, w: Writer) -> Result<()>;
fn br_target(&self, level: usize, in_loop: bool, w: Writer) -> Result<()>;
fn br_to_level(&self, level: usize, up: usize, is_loop: bool, w: Writer) -> Result<()>;
fn i64(&self, i: i64) -> Infix<i64>;
}
pub struct LuaJIT;
impl Edition for LuaJIT {
fn runtime(&self) -> &'static str {
"luajit"
}
fn start_block(&self, w: Writer) -> Result<()> {
writeln!(w, "do")
}
fn start_loop(&self, level: usize, w: Writer) -> Result<()> {
writeln!(w, "do")?;
writeln!(w, "::continue_at_{}::", level)
}
fn start_if(&self, cond: &str, w: Writer) -> Result<()> {
writeln!(w, "if {} ~= 0 then", cond)
}
fn end_block(&self, level: usize, w: Writer) -> Result<()> {
writeln!(w, "::continue_at_{}::", level)?;
writeln!(w, "end")
}
fn end_loop(&self, w: Writer) -> Result<()> {
writeln!(w, "end")
}
fn end_if(&self, level: usize, w: Writer) -> Result<()> {
writeln!(w, "::continue_at_{}::", level)?;
writeln!(w, "end")
}
fn br_target(&self, _level: usize, _in_loop: bool, _w: Writer) -> Result<()> {
Ok(())
}
fn br_to_level(&self, level: usize, up: usize, _is_loop: bool, w: Writer) -> Result<()> {
writeln!(w, "goto continue_at_{}", level - up)
}
fn i64(&self, i: i64) -> Infix<i64> {
Infix {
rhs: "LL",
inner: i,
}
}
}
pub struct Luau;
impl Edition for Luau {
fn runtime(&self) -> &'static str {
"luau"
}
fn start_block(&self, w: Writer) -> Result<()> {
writeln!(w, "while true do")
}
fn start_loop(&self, _level: usize, w: Writer) -> Result<()> {
writeln!(w, "while true do")
}
fn start_if(&self, cond: &str, w: Writer) -> Result<()> {
writeln!(w, "while true do")?;
writeln!(w, "if {} ~= 0 then", cond)
}
fn end_block(&self, _level: usize, w: Writer) -> Result<()> {
writeln!(w, "break")?;
writeln!(w, "end")
}
fn end_loop(&self, w: Writer) -> Result<()> {
writeln!(w, "break")?;
writeln!(w, "end")
}
fn end_if(&self, _level: usize, w: Writer) -> Result<()> {
writeln!(w, "end")?;
writeln!(w, "break")?;
writeln!(w, "end")
}
fn br_target(&self, level: usize, in_loop: bool, w: Writer) -> Result<()> {
writeln!(w, "if desired then")?;
writeln!(w, "if desired == {} then", level)?;
writeln!(w, "desired = nil")?;
if in_loop {
writeln!(w, "continue")?;
}
writeln!(w, "end")?;
writeln!(w, "break")?;
writeln!(w, "end")
}
fn br_to_level(&self, level: usize, up: usize, is_loop: bool, w: Writer) -> Result<()> {
if up == 0 {
if is_loop {
writeln!(w, "continue")?;
} else {
writeln!(w, "break")?;
}
} else {
writeln!(w, "desired = {}", level - up)?;
writeln!(w, "break")?;
}
Ok(())
}
fn i64(&self, i: i64) -> Infix<i64> {
Infix { rhs: "", inner: i }
}
}

3
src/backend/helper/mod.rs Normal file
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pub mod edition;
pub mod register;
pub mod writer;

41
src/backend/helper/register.rs Executable file
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pub struct Register {
pub last: u32,
pub inner: u32,
saved: Vec<u32>,
}
impl Register {
pub fn new() -> Self {
Self {
last: 0,
inner: 0,
saved: vec![0],
}
}
fn extend(&mut self) {
self.last = self.last.max(self.inner);
}
pub fn save(&mut self) {
self.saved.push(self.inner);
}
pub fn load(&mut self) {
self.inner = self.saved.pop().unwrap();
}
pub fn push(&mut self, n: u32) -> u32 {
let prev = self.inner;
self.inner = self.inner.checked_add(n).unwrap();
self.extend();
prev
}
pub fn pop(&mut self, n: u32) -> u32 {
self.inner = self.inner.checked_sub(n).unwrap();
self.inner
}
}

17
src/backend/helper/writer.rs Normal file
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use std::io::{Result, Write};
pub type Writer<'a> = &'a mut dyn Write;
pub fn ordered_iter(prefix: &'static str, end: u32) -> impl Iterator<Item = String> {
(1..=end).map(move |i| format!("{}_{}", prefix, i))
}
pub fn write_ordered(prefix: &'static str, end: u32, w: Writer) -> Result<()> {
let mut iter = ordered_iter(prefix, end);
if let Some(s) = iter.next() {
write!(w, "{}", s)?;
}
iter.try_for_each(|s| write!(w, ", {}", s))
}

2
src/backend/mod.rs Normal file
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pub mod helper;
pub mod translation;

458
src/backend/translation/level_1.rs Normal file
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use super::level_2::list_to_range;
use crate::{
backend::helper::{edition::Edition, register::Register, writer::Writer},
data::{Arity, Code, Module},
};
use parity_wasm::elements::{BrTableData, Instruction};
use std::{fmt::Display, io::Result};
#[derive(PartialEq)]
pub enum Label {
Block,
If,
Loop,
}
pub struct Body<'a> {
spec: &'a dyn Edition,
label_list: Vec<Label>,
pub table_list: Vec<BrTableData>,
pub reg: Register,
}
impl<'a> Body<'a> {
pub fn new(spec: &'a dyn Edition) -> Self {
Self {
spec,
label_list: vec![],
table_list: Vec::new(),
reg: Register::new(),
}
}
pub fn gen(&mut self, index: usize, module: &Module) -> Result<Vec<u8>> {
let mut w = Vec::new();
module.code[index]
.inst_list
.iter()
.try_for_each(|v| self.gen_inst(index, v, module, &mut w))?;
Ok(w)
}
fn gen_jump(&mut self, up: u32, w: Writer) -> Result<()> {
let up = up as usize;
let level = self.label_list.len() - 1;
let is_loop = self.label_list[level - up] == Label::Loop;
self.spec.br_to_level(level, up, is_loop, w)
}
fn gen_br_if(&mut self, i: u32, f: &Code, w: Writer) -> Result<()> {
let cond = f.var_name_of(self.reg.pop(1));
writeln!(w, "if {} ~= 0 then", cond)?;
self.gen_jump(i, w)?;
writeln!(w, "end")
}
fn gen_br_table(&mut self, data: &BrTableData, f: &Code, w: Writer) -> Result<()> {
let case = f.var_name_of(self.reg.pop(1));
for (r, t) in list_to_range(&data.table) {
if r.len() == 1 {
writeln!(w, "if {} == {} then", case, r.start)?;
} else {
writeln!(w, "if {0} >= {1} and {0} <= {2} then", case, r.start, r.end)?;
}
self.gen_jump(t, w)?;
write!(w, "else")?;
}
writeln!(w)?;
self.gen_jump(data.default, w)?;
writeln!(w, "end")
}
fn gen_load(&mut self, t: &str, o: u32, f: &Code, w: Writer) -> Result<()> {
let reg = f.var_name_of(self.reg.pop(1));
self.reg.push(1);
writeln!(w, "{0} = load.{1}(MEMORY_LIST[0], {0} + {2})", reg, t, o)
}
fn gen_store(&mut self, t: &str, o: u32, f: &Code, w: Writer) -> Result<()> {
let val = f.var_name_of(self.reg.pop(1));
let reg = f.var_name_of(self.reg.pop(1));
writeln!(w, "store.{}(MEMORY_LIST[0], {} + {}, {})", t, reg, o, val)
}
fn gen_const<T: Display>(&mut self, val: T, f: &Code, w: Writer) -> Result<()> {
let reg = f.var_name_of(self.reg.push(1));
writeln!(w, "{} = {}", reg, val)
}
fn gen_compare(&mut self, op: &str, f: &Code, w: Writer) -> Result<()> {
let rhs = f.var_name_of(self.reg.pop(1));
let lhs = f.var_name_of(self.reg.pop(1));
self.reg.push(1);
writeln!(w, "{1} = {1} {0} {2} and 1 or 0", op, lhs, rhs)
}
fn gen_unop_ex(&mut self, op: &str, f: &Code, w: Writer) -> Result<()> {
let reg = f.var_name_of(self.reg.pop(1));
self.reg.push(1);
writeln!(w, "{1} = {0}({1})", op, reg)
}
fn gen_binop(&mut self, op: &str, f: &Code, w: Writer) -> Result<()> {
let rhs = f.var_name_of(self.reg.pop(1));
let lhs = f.var_name_of(self.reg.pop(1));
self.reg.push(1);
writeln!(w, "{1} = {1} {0} {2}", op, lhs, rhs)
}
fn gen_binop_ex(&mut self, op: &str, f: &Code, w: Writer) -> Result<()> {
let rhs = f.var_name_of(self.reg.pop(1));
let lhs = f.var_name_of(self.reg.pop(1));
self.reg.push(1);
writeln!(w, "{1} = {0}({1}, {2})", op, lhs, rhs)
}
fn gen_call(&mut self, name: &str, f: &Code, a: &Arity, w: Writer) -> Result<()> {
let bottom = self.reg.pop(a.num_param);
self.reg.push(a.num_result);
if a.num_result != 0 {
let result = f.var_range_of(bottom, a.num_result).join(", ");
writeln!(w, "{} =", result)?;
}
if a.num_param == 0 {
writeln!(w, "{}()", name)
} else {
let param = f.var_range_of(bottom, a.num_param).join(", ");
writeln!(w, "{}({})", name, param)
}
}
fn gen_return(&mut self, num: u32, f: &Code, w: Writer) -> Result<()> {
let top = self.reg.inner;
let list = f.var_range_of(top - num, num).join(", ");
self.reg.pop(num); // technically a no-op
writeln!(w, "do return {} end", list)
}
fn gen_inst(&mut self, index: usize, i: &Instruction, m: &Module, w: Writer) -> Result<()> {
let func = &m.code[index];
match i {
Instruction::Unreachable => writeln!(w, "error('unreachable code entered')"),
Instruction::Nop => {
// no code
Ok(())
}
Instruction::Block(_) => {
self.reg.save();
self.label_list.push(Label::Block);
self.spec.start_block(w)
}
Instruction::Loop(_) => {
self.reg.save();
self.label_list.push(Label::Loop);
self.spec.start_loop(self.label_list.len() - 1, w)
}
Instruction::If(_) => {
let cond = func.var_name_of(self.reg.pop(1));
self.reg.save();
self.label_list.push(Label::If);
self.spec.start_if(&cond, w)
}
Instruction::Else => {
self.reg.load();
self.reg.save();
writeln!(w, "else")
}
Instruction::End => {
let rem = self.label_list.len().saturating_sub(1);
match self.label_list.pop() {
Some(Label::Block) => self.spec.end_block(rem, w)?,
Some(Label::If) => self.spec.end_if(rem, w)?,
Some(Label::Loop) => self.spec.end_loop(w)?,
None => {
let num = m.in_arity[index].num_result;
if num != 0 {
self.gen_return(num, func, w)?;
}
writeln!(w, "end")?;
}
}
self.reg.load();
match self.label_list.last() {
Some(Label::Block | Label::If) => self.spec.br_target(rem, false, w),
Some(Label::Loop) => self.spec.br_target(rem, true, w),
None => Ok(()),
}
}
Instruction::Br(i) => self.gen_jump(*i, w),
Instruction::BrIf(i) => self.gen_br_if(*i, func, w),
Instruction::BrTable(data) => self.gen_br_table(data, func, w),
Instruction::Return => {
let num = m.in_arity[index].num_result;
self.gen_return(num, func, w)
}
Instruction::Call(i) => {
let name = format!("FUNC_LIST[{}]", i);
let arity = m.arity_of(*i as usize);
self.gen_call(&name, func, arity, w)
}
Instruction::CallIndirect(i, t) => {
let index = func.var_name_of(self.reg.pop(1));
let name = format!("TABLE_LIST[{}][{}]", t, index);
let arity = m.arity_of(*i as usize);
self.gen_call(&name, func, arity, w)
}
Instruction::Drop => {
self.reg.pop(1);
Ok(())
}
Instruction::Select => {
let cond = func.var_name_of(self.reg.pop(1));
let v2 = func.var_name_of(self.reg.pop(1));
let v1 = func.var_name_of(self.reg.pop(1));
self.reg.push(1);
writeln!(w, "if {} == 0 then", cond)?;
writeln!(w, "{} = {}", v1, v2)?;
writeln!(w, "end")
}
Instruction::GetLocal(i) => {
let reg = func.var_name_of(self.reg.push(1));
let var = func.var_name_of(*i);
writeln!(w, "{} = {}", reg, var)
}
Instruction::SetLocal(i) => {
let var = func.var_name_of(*i);
let reg = func.var_name_of(self.reg.pop(1));
writeln!(w, "{} = {}", var, reg)
}
Instruction::TeeLocal(i) => {
let var = func.var_name_of(*i);
let reg = func.var_name_of(self.reg.pop(1));
self.reg.push(1);
writeln!(w, "{} = {}", var, reg)
}
Instruction::GetGlobal(i) => {
let reg = func.var_name_of(self.reg.push(1));
writeln!(w, "{} = GLOBAL_LIST[{}].value", reg, i)
}
Instruction::SetGlobal(i) => {
let reg = func.var_name_of(self.reg.pop(1));
writeln!(w, "GLOBAL_LIST[{}].value = {}", i, reg)
}
Instruction::I32Load(_, o) => self.gen_load("i32", *o, func, w),
Instruction::I64Load(_, o) => self.gen_load("i64", *o, func, w),
Instruction::F32Load(_, o) => self.gen_load("f32", *o, func, w),
Instruction::F64Load(_, o) => self.gen_load("f64", *o, func, w),
Instruction::I32Load8S(_, o) => self.gen_load("i32_i8", *o, func, w),
Instruction::I32Load8U(_, o) => self.gen_load("i32_u8", *o, func, w),
Instruction::I32Load16S(_, o) => self.gen_load("i32_i16", *o, func, w),
Instruction::I32Load16U(_, o) => self.gen_load("i32_u16", *o, func, w),
Instruction::I64Load8S(_, o) => self.gen_load("i64_i8", *o, func, w),
Instruction::I64Load8U(_, o) => self.gen_load("i64_u8", *o, func, w),
Instruction::I64Load16S(_, o) => self.gen_load("i64_i16", *o, func, w),
Instruction::I64Load16U(_, o) => self.gen_load("i64_u16", *o, func, w),
Instruction::I64Load32S(_, o) => self.gen_load("i64_i32", *o, func, w),
Instruction::I64Load32U(_, o) => self.gen_load("i64_u32", *o, func, w),
Instruction::I32Store(_, o) => self.gen_store("i32", *o, func, w),
Instruction::I64Store(_, o) => self.gen_store("i64", *o, func, w),
Instruction::F32Store(_, o) => self.gen_store("f32", *o, func, w),
Instruction::F64Store(_, o) => self.gen_store("f64", *o, func, w),
Instruction::I32Store8(_, o) => self.gen_store("i32_n8", *o, func, w),
Instruction::I32Store16(_, o) => self.gen_store("i32_n16", *o, func, w),
Instruction::I64Store8(_, o) => self.gen_store("i64_n8", *o, func, w),
Instruction::I64Store16(_, o) => self.gen_store("i64_n16", *o, func, w),
Instruction::I64Store32(_, o) => self.gen_store("i64_n32", *o, func, w),
Instruction::CurrentMemory(index) => {
let reg = func.var_name_of(self.reg.push(1));
writeln!(w, "{} = read_page_num(MEMORY_LIST[{}])", reg, index)
}
Instruction::GrowMemory(index) => {
let reg = func.var_name_of(self.reg.pop(1));
self.reg.push(1);
writeln!(w, "{0} = grow_page_num(MEMORY_LIST[{1}], {0})", reg, index)
}
Instruction::I32Const(v) => self.gen_const(v, func, w),
Instruction::I64Const(v) => self.gen_const(self.spec.i64(*v), func, w),
Instruction::F32Const(v) => self.gen_const(f32::from_bits(*v), func, w),
Instruction::F64Const(v) => self.gen_const(f64::from_bits(*v), func, w),
Instruction::I32Eqz | Instruction::I64Eqz => {
let reg = func.var_name_of(self.reg.pop(1));
self.reg.push(1);
writeln!(w, "{} = {} == 0 and 1 or 0", reg, reg)
}
Instruction::I32Eq | Instruction::I64Eq | Instruction::F32Eq | Instruction::F64Eq => {
self.gen_compare("==", func, w)
}
Instruction::I32Ne | Instruction::I64Ne | Instruction::F32Ne | Instruction::F64Ne => {
self.gen_compare("~=", func, w)
}
// note that signed comparisons of all types behave the same so
// they can be condensed using Lua's operators
Instruction::I32LtU => self.gen_binop_ex("lt.u32", func, w),
Instruction::I32LtS | Instruction::I64LtS | Instruction::F32Lt | Instruction::F64Lt => {
self.gen_compare("<", func, w)
}
Instruction::I32GtU => self.gen_binop_ex("gt.u32", func, w),
Instruction::I32GtS | Instruction::I64GtS | Instruction::F32Gt | Instruction::F64Gt => {
self.gen_compare(">", func, w)
}
Instruction::I32LeU => self.gen_binop_ex("le.u32", func, w),
Instruction::I32LeS | Instruction::I64LeS | Instruction::F32Le | Instruction::F64Le => {
self.gen_compare("<=", func, w)
}
Instruction::I32GeU => self.gen_binop_ex("ge.u32", func, w),
Instruction::I32GeS | Instruction::I64GeS | Instruction::F32Ge | Instruction::F64Ge => {
self.gen_compare(">=", func, w)
}
Instruction::I64LtU => self.gen_binop_ex("lt.u64", func, w),
Instruction::I64GtU => self.gen_binop_ex("gt.u64", func, w),
Instruction::I64LeU => self.gen_binop_ex("le.u64", func, w),
Instruction::I64GeU => self.gen_binop_ex("ge.u64", func, w),
Instruction::I32Clz => self.gen_unop_ex("clz.i32", func, w),
Instruction::I32Ctz => self.gen_unop_ex("ctz.i32", func, w),
Instruction::I32Popcnt => self.gen_unop_ex("popcnt.i32", func, w),
Instruction::I32DivS => self.gen_binop_ex("div.i32", func, w),
Instruction::I32DivU => self.gen_binop_ex("div.u32", func, w),
Instruction::I32RemS => self.gen_binop_ex("rem.i32", func, w),
Instruction::I32RemU => self.gen_binop_ex("rem.u32", func, w),
Instruction::I32And => self.gen_binop_ex("band.i32", func, w),
Instruction::I32Or => self.gen_binop_ex("bor.i32", func, w),
Instruction::I32Xor => self.gen_binop_ex("bxor.i32", func, w),
Instruction::I32Shl => self.gen_binop_ex("shl.i32", func, w),
Instruction::I32ShrS => self.gen_binop_ex("shr.i32", func, w),
Instruction::I32ShrU => self.gen_binop_ex("shr.u32", func, w),
Instruction::I32Rotl => self.gen_binop_ex("rotl.i32", func, w),
Instruction::I32Rotr => self.gen_binop_ex("rotr.i32", func, w),
Instruction::I64Clz => self.gen_unop_ex("clz.i64", func, w),
Instruction::I64Ctz => self.gen_unop_ex("ctz.i64", func, w),
Instruction::I64Popcnt => self.gen_unop_ex("popcnt.i64", func, w),
Instruction::I64DivS => self.gen_binop_ex("div.i64", func, w),
Instruction::I64DivU => self.gen_binop_ex("div.u64", func, w),
Instruction::I64RemS => self.gen_binop_ex("rem.i64", func, w),
Instruction::I64RemU => self.gen_binop_ex("rem.u64", func, w),
Instruction::I64And => self.gen_binop_ex("band.i64", func, w),
Instruction::I64Or => self.gen_binop_ex("bor.i64", func, w),
Instruction::I64Xor => self.gen_binop_ex("bxor.i64", func, w),
Instruction::I64Shl => self.gen_binop_ex("shl.i64", func, w),
Instruction::I64ShrS => self.gen_binop_ex("shr.i64", func, w),
Instruction::I64ShrU => self.gen_binop_ex("shr.u64", func, w),
Instruction::I64Rotl => self.gen_binop_ex("rotl.i64", func, w),
Instruction::I64Rotr => self.gen_binop_ex("rotr.i64", func, w),
Instruction::F32Abs | Instruction::F64Abs => self.gen_unop_ex("math.abs", func, w),
Instruction::F32Neg | Instruction::F64Neg => {
let reg = func.var_name_of(self.reg.pop(1));
self.reg.push(1);
writeln!(w, "{} = -{}", reg, reg)
}
Instruction::F32Ceil | Instruction::F64Ceil => self.gen_unop_ex("math.ceil", func, w),
Instruction::F32Floor | Instruction::F64Floor => {
self.gen_unop_ex("math.floor", func, w)
}
Instruction::F32Trunc | Instruction::F64Trunc => self.gen_unop_ex("trunc.f", func, w),
Instruction::F32Nearest | Instruction::F64Nearest => {
self.gen_unop_ex("nearest.f", func, w)
}
Instruction::F32Sqrt | Instruction::F64Sqrt => self.gen_unop_ex("math.sqrt", func, w),
Instruction::I32Add
| Instruction::I64Add
| Instruction::F32Add
| Instruction::F64Add => self.gen_binop("+", func, w),
Instruction::I32Sub
| Instruction::I64Sub
| Instruction::F32Sub
| Instruction::F64Sub => self.gen_binop("-", func, w),
Instruction::I32Mul
| Instruction::I64Mul
| Instruction::F32Mul
| Instruction::F64Mul => self.gen_binop("*", func, w),
Instruction::F32Div | Instruction::F64Div => self.gen_binop("/", func, w),
Instruction::F32Min | Instruction::F64Min => self.gen_binop_ex("math.min", func, w),
Instruction::F32Max | Instruction::F64Max => self.gen_binop_ex("math.max", func, w),
Instruction::F32Copysign | Instruction::F64Copysign => {
self.gen_unop_ex("math.sign", func, w)
}
Instruction::I32WrapI64 => self.gen_unop_ex("wrap.i64_i32", func, w),
Instruction::I32TruncSF32 => self.gen_unop_ex("trunc.f32_i32", func, w),
Instruction::I32TruncUF32 => self.gen_unop_ex("trunc.f32_u32", func, w),
Instruction::I32TruncSF64 => self.gen_unop_ex("trunc.f64_i32", func, w),
Instruction::I32TruncUF64 => self.gen_unop_ex("trunc.f64_u32", func, w),
Instruction::I64ExtendSI32 => self.gen_unop_ex("extend.i32_i64", func, w),
Instruction::I64ExtendUI32 => self.gen_unop_ex("extend.i32_u64", func, w),
Instruction::I64TruncSF32 => self.gen_unop_ex("trunc.f32_i64", func, w),
Instruction::I64TruncUF32 => self.gen_unop_ex("trunc.f32_u64", func, w),
Instruction::I64TruncSF64 => self.gen_unop_ex("trunc.f64_i64", func, w),
Instruction::I64TruncUF64 => self.gen_unop_ex("trunc.f64_u64", func, w),
Instruction::F32ConvertSI32 => self.gen_unop_ex("convert.i32_f32", func, w),
Instruction::F32ConvertUI32 => self.gen_unop_ex("convert.u32_f32", func, w),
Instruction::F32ConvertSI64 => self.gen_unop_ex("convert.i64_f32", func, w),
Instruction::F32ConvertUI64 => self.gen_unop_ex("convert.u64_f32", func, w),
Instruction::F32DemoteF64 => self.gen_unop_ex("demote.f64_f32", func, w),
Instruction::F64ConvertSI32 => self.gen_unop_ex("convert.f64_i32", func, w),
Instruction::F64ConvertUI32 => self.gen_unop_ex("convert.f64_u32", func, w),
Instruction::F64ConvertSI64 => self.gen_unop_ex("convert.f64_i64", func, w),
Instruction::F64ConvertUI64 => self.gen_unop_ex("convert.f64_u64", func, w),
Instruction::F64PromoteF32 => self.gen_unop_ex("promote.f32_f64", func, w),
Instruction::I32ReinterpretF32 => self.gen_unop_ex("reinterpret.f32_i32", func, w),
Instruction::I64ReinterpretF64 => self.gen_unop_ex("reinterpret.f64_i64", func, w),
Instruction::F32ReinterpretI32 => self.gen_unop_ex("reinterpret.i32_f32", func, w),
Instruction::F64ReinterpretI64 => self.gen_unop_ex("reinterpret.i64_f64", func, w),
}
}
}

97
src/backend/translation/level_2.rs Normal file
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use super::level_1::Body;
use crate::{
backend::helper::{
edition::Edition,
writer::{write_ordered, Writer},
},
data::Module,
};
use parity_wasm::elements::Instruction;
use std::{
io::{Result, Write},
ops::Range,
};
pub fn list_to_range(list: &[u32]) -> Vec<(Range<usize>, u32)> {
let mut result = Vec::new();
let mut index = 0;
while index < list.len() {
let start = index;
loop {
index += 1;
// if end of list or next value is not equal, break
if index == list.len() || list[index - 1] != list[index] {
break;
}
}
result.push((start..index, list[start]));
}
result
}
pub fn gen_init_expression(code: &[Instruction], w: Writer) -> Result<()> {
assert!(code.len() == 2);
let inst = code.first().unwrap();
match *inst {
Instruction::I32Const(v) => writeln!(w, "{}", v),
Instruction::I64Const(v) => writeln!(w, "{}", v),
Instruction::F32Const(v) => writeln!(w, "{}", f32::from_bits(v)),
Instruction::F64Const(v) => writeln!(w, "{}", f64::from_bits(v)),
Instruction::GetGlobal(i) => writeln!(w, "GLOBAL_LIST[{}].value", i),
_ => unreachable!(),
}
}
fn gen_prelude(num_param: u32, num_local: u32) -> Result<Vec<u8>> {
let mut w = Vec::new();
writeln!(w, "function(")?;
write_ordered("param", num_param, &mut w)?;
writeln!(w, ")")?;
if num_local != 0 {
let zero = vec!["0"; num_local as usize].join(", ");
writeln!(w, "local")?;
write_ordered("var", num_local, &mut w)?;
writeln!(w, "= {}", zero)?;
}
Ok(w)
}
fn gen_reg_list(last: u32, num_param: u32, num_local: u32) -> Result<Vec<u8>> {
let mut w = Vec::new();
let num = last - num_local - num_param;
if num != 0 {
writeln!(w, "local")?;
write_ordered("reg", num, &mut w)?;
writeln!(w)?;
}
Ok(w)
}
pub fn gen_function(spec: &dyn Edition, index: usize, m: &Module, w: Writer) -> Result<()> {
let mut inner = Body::new(spec);
let num_param = m.in_arity[index].num_param;
let num_local = m.code[index].num_local;
inner.reg.push(num_param + num_local);
let prelude = gen_prelude(num_param, num_local)?;
let body = inner.gen(index, m)?;
let reg = gen_reg_list(inner.reg.last, num_param, num_local)?;
w.write_all(&prelude)?;
w.write_all(&reg)?;
w.write_all(&body)
}

266
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use super::level_2::{gen_function, gen_init_expression};
use crate::{
backend::helper::{edition::Edition, writer::Writer},
data::Module,
};
use parity_wasm::elements::{External, ImportCountType, Internal, ResizableLimits};
use std::io::Result;
const RUNTIME_DATA: &str = "
local grow_page_num = runtime.grow_page_num
local add = runtime.add
local sub = runtime.sub
local mul = runtime.mul
local div = runtime.div
local le = runtime.le
local lt = runtime.lt
local ge = runtime.ge
local gt = runtime.gt
local band = runtime.band
local bor = runtime.bor
local bxor = runtime.bxor
local bnot = runtime.bnot
local shl = runtime.shl
local shr = runtime.shr
local extend = runtime.extend
local wrap = runtime.wrap
local load = runtime.load
local store = runtime.store
";
fn gen_import_of<T>(m: &Module, w: Writer, lower: &str, cond: T) -> Result<()>
where
T: Fn(&External) -> bool,
{
let import = match m.parent.import_section() {
Some(v) => v.entries(),
None => return Ok(()),
};
let upper = lower.to_uppercase();
for (i, v) in import.iter().filter(|v| cond(v.external())).enumerate() {
let field = v.field();
let module = v.module();
writeln!(w, "{}[{}] = wasm.{}.{}.{}", upper, i, module, lower, field)?;
}
Ok(())
}
fn aux_internal_index(internal: Internal) -> u32 {
match internal {
Internal::Function(v) | Internal::Table(v) | Internal::Memory(v) | Internal::Global(v) => v,
}
}
fn gen_export_of<T>(m: &Module, w: Writer, lower: &str, cond: T) -> Result<()>
where
T: Fn(&Internal) -> bool,
{
let export = match m.parent.export_section() {
Some(v) => v.entries(),
None => return Ok(()),
};
let upper = lower.to_uppercase();
writeln!(w, "{} = {{", lower)?;
for v in export.iter().filter(|v| cond(v.internal())) {
let field = v.field();
let index = aux_internal_index(*v.internal());
writeln!(w, "{} = {}[{}],", field, upper, index)?;
}
writeln!(w, "}},")
}
fn gen_import_list(m: &Module, w: Writer) -> Result<()> {
gen_import_of(m, w, "func_list", |v| matches!(v, External::Function(_)))?;
gen_import_of(m, w, "table_list", |v| matches!(v, External::Table(_)))?;
gen_import_of(m, w, "memory_list", |v| matches!(v, External::Memory(_)))?;
gen_import_of(m, w, "global_list", |v| matches!(v, External::Global(_)))
}
fn gen_export_list(m: &Module, w: Writer) -> Result<()> {
gen_export_of(m, w, "func_list", |v| matches!(v, Internal::Function(_)))?;
gen_export_of(m, w, "table_list", |v| matches!(v, Internal::Table(_)))?;
gen_export_of(m, w, "memory_list", |v| matches!(v, Internal::Memory(_)))?;
gen_export_of(m, w, "global_list", |v| matches!(v, Internal::Global(_)))
}
fn gen_limit_data(limit: &ResizableLimits, w: Writer) -> Result<()> {
writeln!(w, "{{ min = {}", limit.initial())?;
if let Some(max) = limit.maximum() {
writeln!(w, ", max = {}", max)?;
}
writeln!(w, ", data = {{}} }}")
}
fn gen_table_list(m: &Module, w: Writer) -> Result<()> {
let table = match m.parent.table_section() {
Some(v) => v.entries(),
None => return Ok(()),
};
let offset = m.parent.import_count(ImportCountType::Table);
for (i, v) in table.iter().enumerate() {
let index = i + offset;
writeln!(w, "TABLE_LIST[{}] =", index)?;
gen_limit_data(v.limits(), w)?;
}
Ok(())
}
fn gen_memory_list(m: &Module, w: Writer) -> Result<()> {
let memory = match m.parent.memory_section() {
Some(v) => v.entries(),
None => return Ok(()),
};
let offset = m.parent.import_count(ImportCountType::Memory);
for (i, v) in memory.iter().enumerate() {
let index = i + offset;
writeln!(w, "MEMORY_LIST[{}] =", index)?;
gen_limit_data(v.limits(), w)?;
}
Ok(())
}
fn gen_global_list(m: &Module, w: Writer) -> Result<()> {
let global = match m.parent.global_section() {
Some(v) => v,
None => return Ok(()),
};
let offset = m.parent.import_count(ImportCountType::Global);
for (i, v) in global.entries().iter().enumerate() {
let index = i + offset;
writeln!(w, "GLOBAL_LIST[{}] = {{ value =", index)?;
gen_init_expression(v.init_expr().code(), w)?;
writeln!(w, "}}")?;
}
Ok(())
}
fn gen_element_list(m: &Module, w: Writer) -> Result<()> {
let element = match m.parent.elements_section() {
Some(v) => v.entries(),
None => return Ok(()),
};
for v in element {
writeln!(w, "do")?;
writeln!(w, "local target = TABLE_LIST[{}]", v.index())?;
writeln!(w, "local offset =")?;
gen_init_expression(v.offset().as_ref().unwrap().code(), w)?;
for (i, f) in v.members().iter().enumerate() {
writeln!(w, "target[offset + {}] = FUNC_LIST[{}]", i, f)?;
}
writeln!(w, "end")?;
}
Ok(())
}
fn gen_data_list(m: &Module, w: Writer) -> Result<()> {
let data = match m.parent.data_section() {
Some(v) => v.entries(),
None => return Ok(()),
};
for v in data {
writeln!(w, "do")?;
writeln!(w, "local target = MEMORY_LIST[{}].data", v.index())?;
writeln!(w, "local offset =")?;
gen_init_expression(v.offset().as_ref().unwrap().code(), w)?;
writeln!(w, "/ 4")?;
for (i, b) in v.value().chunks(4).enumerate() {
let mut temp = [0; 4];
temp.iter_mut().zip(b).for_each(|(l, r)| *l = *r);
let value = u32::from_le_bytes(temp);
writeln!(w, "target[offset + {}] = 0x{:X}", i, value)?;
}
writeln!(w, "end")?;
}
Ok(())
}
fn gen_start_point(m: &Module, w: Writer) -> Result<()> {
writeln!(w, "local function run_init_code()")?;
gen_table_list(m, w)?;
gen_memory_list(m, w)?;
gen_global_list(m, w)?;
gen_element_list(m, w)?;
gen_data_list(m, w)?;
writeln!(w, "end")?;
writeln!(w, "return function(wasm)")?;
gen_import_list(m, w)?;
writeln!(w, "run_init_code()")?;
if let Some(start) = m.parent.start_section() {
writeln!(w, "FUNC_LIST[{}]()", start)?;
}
writeln!(w, "return {{")?;
gen_export_list(m, w)?;
writeln!(w, "}} end")
}
fn gen_nil_array(name: &str, len: usize, w: Writer) -> Result<()> {
if len == 0 {
return Ok(());
}
let list = vec!["nil"; len].join(", ");
writeln!(w, "local {} = {{[0] = {}}}", name, list)
}
pub fn translate(spec: &dyn Edition, m: &Module, w: Writer) -> Result<()> {
writeln!(w, "local runtime = require('{}')", spec.runtime())?;
writeln!(w, "{}", RUNTIME_DATA)?;
gen_nil_array("FUNC_LIST", m.in_arity.len(), w)?;
gen_nil_array("TABLE_LIST", m.parent.table_space(), w)?;
gen_nil_array("MEMORY_LIST", m.parent.memory_space(), w)?;
gen_nil_array("GLOBAL_LIST", m.parent.globals_space(), w)?;
let offset = m.ex_arity.len();
for i in 0..m.in_arity.len() {
writeln!(w, "FUNC_LIST[{}] =", i + offset)?;
gen_function(spec, i, m, w)?;
}
gen_start_point(m, w)
}

8
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// Translation is done in levels.
// Level 1 handles user logic and WASM instructions.
// Level 2 handles setup for functions.
// Level 3 handles initialization of the module.
mod level_1;
mod level_2;
pub mod level_3;

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use crate::backend::helper::writer::ordered_iter;
use parity_wasm::elements::{
External, FunctionType, ImportEntry, Instruction, Local, Module as WasmModule, Type,
};
use std::{borrow::Cow, convert::TryInto};
pub struct Code<'a> {
pub num_local: u32,
pub inst_list: &'a [Instruction],
var_list: Vec<String>,
}
impl<'a> Code<'a> {
pub fn new(inst_list: &'a [Instruction], num_local: u32) -> Self {
Self {
num_local,
inst_list,
var_list: Vec::new(),
}
}
pub fn local_sum(list: &[Local]) -> u32 {
list.iter().map(Local::count).sum()
}
pub fn var_name_of(&self, index: u32) -> Cow<'_, str> {
let index: usize = index.try_into().unwrap();
let offset = self.var_list.len();
self.var_list
.get(index)
.map_or_else(|| format!("reg_{}", index - offset + 1).into(), Cow::from)
}
pub fn var_range_of(&self, start: u32, len: u32) -> Vec<Cow<'_, str>> {
(start..start + len).map(|i| self.var_name_of(i)).collect()
}
}
pub struct Arity {
pub num_param: u32,
pub num_result: u32,
}
impl Arity {
fn from_type(typ: &FunctionType) -> Self {
let num_param = typ.params().len().try_into().unwrap();
let num_result = typ.results().len().try_into().unwrap();
Self {
num_param,
num_result,
}
}
pub fn from_index(types: &[Type], index: u32) -> Self {
let Type::Function(typ) = &types[index as usize];
Self::from_type(typ)
}
}
pub struct Module<'a> {
pub ex_arity: Vec<Arity>,
pub in_arity: Vec<Arity>,
pub code: Vec<Code<'a>>,
pub parent: &'a WasmModule,
}
impl<'a> Module<'a> {
pub fn new(parent: &'a WasmModule) -> Self {
let mut module = Module {
in_arity: Self::new_arity_in_list(parent),
ex_arity: Self::new_arity_ex_list(parent),
code: Self::new_function_list(parent),
parent,
};
module.fill_cache();
module
}
fn fill_cache(&mut self) {
for (a, c) in self.in_arity.iter().zip(self.code.iter_mut()) {
c.var_list = ordered_iter("param", a.num_param)
.chain(ordered_iter("var", c.num_local))
.collect();
}
}
pub fn arity_of(&self, index: usize) -> &Arity {
let offset = self.ex_arity.len();
self.ex_arity
.get(index)
.or_else(|| self.in_arity.get(index - offset))
.unwrap()
}
fn new_arity_ext(types: &[Type], import: &ImportEntry) -> Option<Arity> {
if let External::Function(i) = import.external() {
Some(Arity::from_index(types, *i))
} else {
None
}
}
fn new_arity_in_list(wasm: &WasmModule) -> Vec<Arity> {
let (types, funcs) = match (wasm.type_section(), wasm.function_section()) {
(Some(t), Some(f)) => (t.types(), f.entries()),
_ => return Vec::new(),
};
funcs
.iter()
.map(|i| Arity::from_index(types, i.type_ref()))
.collect()
}
fn new_arity_ex_list(wasm: &WasmModule) -> Vec<Arity> {
let (types, imports) = match (wasm.type_section(), wasm.import_section()) {
(Some(t), Some(i)) => (t.types(), i.entries()),
_ => return Vec::new(),
};
imports
.iter()
.filter_map(|i| Self::new_arity_ext(types, i))
.collect()
}
fn new_function_list(wasm: &WasmModule) -> Vec<Code> {
let bodies = match wasm.code_section() {
Some(b) => b.bodies(),
None => return Vec::new(),
};
bodies
.iter()
.map(|v| {
let num_local = Code::local_sum(v.locals());
Code::new(v.code().elements(), num_local)
})
.collect()
}
}

30
src/main.rs Executable file
View File

@ -0,0 +1,30 @@
use backend::{
helper::edition::{Edition, LuaJIT, Luau},
translation::level_3,
};
use data::Module;
use parity_wasm::elements::deserialize_file;
mod backend;
mod data;
fn main() {
let mut args = std::env::args().skip(1);
let spec: Box<dyn Edition> = match args.next().as_deref().map(str::to_lowercase).as_deref() {
Some("luau") => Box::new(Luau),
Some("luajit") => Box::new(LuaJIT),
_ => {
println!("expected either 'luau' or 'luajit' option");
return;
}
};
let output = std::io::stdout();
for v in args {
let wasm = deserialize_file(v).unwrap();
let module = Module::new(&wasm);
level_3::translate(spec.as_ref(), &module, &mut output.lock()).unwrap();
}
}