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fix: Don't insert temporary wires when extracting a subgraph #582

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merged 2 commits into from
Sep 29, 2023
Merged

fix: Don't insert temporary wires when extracting a subgraph #582

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c868b86
fix: Don't insert temporary wires when extracting a subgraph
aborgna-q Sep 29, 2023
e3a6820
Update src/hugr/views/sibling_subgraph.rs
aborgna-q Sep 29, 2023
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19 changes: 9 additions & 10 deletions src/hugr/views/sibling_subgraph.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -10,13 +10,14 @@
//! hierarchy.

use std::collections::HashSet;
use std::mem;

use itertools::Itertools;
use portgraph::{view::Subgraph, Direction, PortView};
use thiserror::Error;

use crate::builder::{Dataflow, DataflowHugr, FunctionBuilder};
use crate::extension::{ExtensionSet, PRELUDE_REGISTRY};
use crate::builder::{Container, FunctionBuilder};
use crate::extension::ExtensionSet;
use crate::hugr::{HugrError, HugrMut};
use crate::types::Signature;
use crate::{
Expand Down Expand Up @@ -415,23 +416,20 @@ impl SiblingSubgraph {
signature: self.signature(hugr),
input_extensions,
};
let builder = FunctionBuilder::new(name, signature).unwrap();
let inputs = builder.input_wires();
let mut extracted = builder
.finish_hugr_with_outputs(inputs, &PRELUDE_REGISTRY)
.unwrap();
let mut builder = FunctionBuilder::new(name, signature).unwrap();
// Take the unfinished Hugr from the builder, to avoid unnecessary
// validation checks that require connecting the inputs and outputs.
let mut extracted = mem::take(builder.hugr_mut());
let node_map = extracted
.insert_subgraph(extracted.root(), hugr, self)?
.node_map;

// Disconnect the input and output nodes, and connect the inserted nodes
// in-between.
// Connect the inserted nodes in-between the input and output nodes.
let [inp, out] = extracted.get_io(extracted.root()).unwrap();
for (inp_port, repl_ports) in extracted
.node_ports(inp, Direction::Outgoing)
.zip(self.inputs.iter())
{
extracted.disconnect(inp, inp_port)?;
for (repl_node, repl_port) in repl_ports {
extracted.connect(inp, inp_port, node_map[repl_node], *repl_port)?;
}
Expand Down Expand Up @@ -651,6 +649,7 @@ pub enum InvalidSubgraph {
mod tests {
use std::error::Error;

use crate::extension::PRELUDE_REGISTRY;
use crate::{
builder::{
BuildError, DFGBuilder, Dataflow, DataflowHugr, DataflowSubContainer, HugrBuilder,
Expand Down