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netlist.rs
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netlist.rs
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use crate::ast::graph::*;
use itertools::Itertools;
use std::{
collections::{HashMap, HashSet},
io::Write,
};
//not much to say : it writes a netlist to anything implementing write
//(it can be a file, or a string, or a port...)
pub fn to_netlist(source: &FlatProgramGraph, mut dest: impl Write) -> Result<(), std::io::Error> {
writeln!(
dest,
"INPUT {}",
(0..source.inputs.len()).format_with(", ", |elt, f| f(&format_args!("i_{}", elt)))
)?;
writeln!(
dest,
"OUTPUT {}",
source
.outputs
.iter()
.format_with(", ", |elt, f| f(&format_args!("o_{}", elt.0)))
)?;
write!(dest, "VAR ")?;
for (i, s) in source.inputs.iter().enumerate() {
write!(dest, "i_{} : {},", i, s)?;
}
for (i, (name, n)) in source.outputs.iter().enumerate() {
let s = write_vars(n, &mut dest, &mut HashMap::new(), &source.inputs)?;
write!(dest, "o_{} : {}", name, s)?;
if i != source.outputs.len() - 1 {
write!(dest, ",")?;
}
}
write!(dest, "\nIN\n")?;
for (s, n) in &source.outputs {
write_instr(n, &mut dest, &mut HashSet::new())?;
write!(dest, "o_{} = ", s)?;
write_var_name(n, &mut dest)?;
write!(dest, "\n")?;
}
Ok(())
}
fn write_vars(
node: &RCell<Node>,
dest: &mut impl Write,
mem: &mut HashMap<u32, usize>,
input_sizes: &Vec<usize>,
) -> Result<usize, std::io::Error> {
if let Some(i) = mem.get(&node.id()) {
return Ok(*i);
}
mem.insert(node.id(), 0);
let size = match node.borrow().clone() {
Node::Input(i) => input_sizes[i],
Node::Const(c) => c.len(),
Node::Not(e) => write_vars(&e, dest, mem, input_sizes)?,
Node::Slice(e, c1, c2) => {
write_vars(&e, dest, mem, input_sizes)?;
c2 - c1
}
Node::BiOp(_, e1, e2) => {
write_vars(&e1, dest, mem, input_sizes)?;
write_vars(&e2, dest, mem, input_sizes)?
}
Node::Mux(e1, e2, e3) => {
write_vars(&e1, dest, mem, input_sizes)?;
write_vars(&e2, dest, mem, input_sizes)?;
write_vars(&e3, dest, mem, input_sizes)?
}
Node::Reg(s, e) => {
mem.insert(node.id(), s);
write_vars(&e, dest, mem, input_sizes)?;
s
}
Node::Ram(e1, e2, e3, e4) => {
write_vars(&e1, dest, mem, input_sizes)?;
write_vars(&e2, dest, mem, input_sizes)?;
write_vars(&e3, dest, mem, input_sizes)?;
write_vars(&e4, dest, mem, input_sizes)?
}
Node::Rom(s, e) => {
write_vars(&e, dest, mem, input_sizes)?;
s
}
Node::TmpValueHolder(_) => 0,
};
write!(dest, "v_{}", node.id())?;
if size != 1 {
write!(dest, " : {}", size)?;
}
write!(dest, ", ")?;
mem.insert(node.id(), size);
Ok(size)
}
fn write_instr(
node: &RCell<Node>,
dest: &mut impl Write,
mem: &mut HashSet<u32>,
) -> Result<(), std::io::Error> {
if mem.contains(&node.id()) {
return Ok(());
}
mem.insert(node.id());
match node.borrow().clone() {
Node::Input(_) => {}
Node::Const(v) => {
write!(dest, "v_{} = ", node.id())?;
write!(
dest,
"{}",
v.iter()
.format_with(" ", |elt, f| f(if *elt { &"1" } else { &"0" }))
)?
}
Node::Not(e) => {
write_instr(&e, dest, mem)?;
write!(dest, "v_{} = ", node.id())?;
write!(dest, "NOT ")?;
write_var_name(&e, dest)?;
}
Node::Slice(e, c1, c2) => {
write_instr(&e, dest, mem)?;
write!(dest, "v_{} = ", node.id())?;
if c2 - c1 != 1 {
write!(dest, "SLICE {} {} ", c1, c2)?;
} else {
write!(dest, "SELECT {} ", c1)?;
}
write_var_name(&e, dest)?;
}
Node::BiOp(op, e1, e2) => {
write_instr(&e1, dest, mem)?;
write_instr(&e2, dest, mem)?;
write!(dest, "v_{} = ", node.id())?;
write_op(op, dest)?;
write_var_name(&e1, dest)?;
write_var_name(&e2, dest)?;
}
Node::Mux(e1, e2, e3) => {
write_instr(&e1, dest, mem)?;
write_instr(&e2, dest, mem)?;
write_instr(&e3, dest, mem)?;
write!(dest, "v_{} = ", node.id())?;
write!(dest, "MUX ")?;
write_var_name(&e1, dest)?;
write_var_name(&e2, dest)?;
write_var_name(&e3, dest)?;
}
Node::Reg(_, e) => {
write_instr(&e, dest, mem)?;
write!(dest, "v_{} = ", node.id())?;
write!(dest, "REG ")?;
write_var_name(&e, dest)?;
}
Node::Ram(e1, e2, e3, e4) => {
write_instr(&e1, dest, mem)?;
write_instr(&e2, dest, mem)?;
write_instr(&e3, dest, mem)?;
write_instr(&e4, dest, mem)?;
write!(dest, "v_{} = ", node.id())?;
write!(dest, "RAM ")?;
write_var_name(&e1, dest)?;
write_var_name(&e2, dest)?;
write_var_name(&e3, dest)?;
write_var_name(&e4, dest)?;
}
Node::Rom(_, e) => {
write_instr(&e, dest, mem)?;
write!(dest, "v_{} = ", node.id())?;
write!(dest, "ROM ")?;
write_var_name(&e, dest)?;
}
Node::TmpValueHolder(_) => {
panic!("Should not happen: temp value in codegen")
}
};
write!(dest, "\n")?;
Ok(())
}
fn write_var_name(node: &RCell<Node>, dest: &mut impl Write) -> Result<(), std::io::Error> {
match node.borrow().clone() {
Node::Input(i) => write!(dest, "i_{} ", i),
_ => write!(dest, "v_{} ", node.id()),
}
}
fn write_op(op: BiOp, dest: &mut impl Write) -> Result<(), std::io::Error> {
match op {
BiOp::And => {
write!(dest, "AND ")
}
BiOp::Or => {
write!(dest, "OR ")
}
BiOp::Xor => {
write!(dest, "XOR ")
}
BiOp::Nand => {
write!(dest, "NAND ")
}
BiOp::Concat => {
write!(dest, "CONCAT ")
}
}
}