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Emit the reducer extent shift and the flat-span materialization

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This commit is contained in:
Dennis Kobert
2026-08-19 21:43:14 +00:00
parent 7ffc9b9e3b
commit cb46be0430
1 changed files with 31 additions and 1 deletions
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32
node-graph/node-macro/src/codegen.rs
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@@ -771,6 +771,12 @@ pub(crate) fn generate_node_impl(crate_ident: &CrateIdent, parsed: &ParsedNodeFn
.iter()
.any(|bound| matches!(bound, TypeParamBound::Trait(trait_bound) if trait_bound.path.segments.last().is_some_and(|segment| segment.ident == "ExtractArena")))
});
let ctx_extracts_index = ctx_param.is_some_and(|ctx_param| {
ctx_param
.bounds
.iter()
.any(|bound| matches!(bound, TypeParamBound::Trait(trait_bound) if trait_bound.path.segments.last().is_some_and(|segment| segment.ident == "ExtractIndex")))
});
let derives = ctx_param.is_some_and(|ctx_param| {
ctx_param.bounds.iter().any(|bound| match bound {
@@ -779,6 +785,9 @@ pub(crate) fn generate_node_impl(crate_ident: &CrateIdent, parsed: &ParsedNodeFn
})
});
let derive_routing = derives && routing_generic.is_some();
// A reducer's materialized subject folds the flat span of the consumer's
// lane when the wire is deeper than the fold; the ctx supplies the lane.
let derived_materialized = |index: usize| ctx_extracts_index && node.inputs[index].subject && ir::materialized_levels(&node, index) > 0 && node.output.shape.depth == 0;
let ctx_generic = match ctx_bounds.is_empty() {
true => quote!(#ctx_ident),
@@ -1115,6 +1124,18 @@ pub(crate) fn generate_node_impl(crate_ident: &CrateIdent, parsed: &ParsedNodeFn
let non_exact = fail(quote!(#core_types::gpoll::GraphError::new("reduce over a non-exact extent")));
let batch_error = fail(quote!(__error));
let batch_failed = fail(quote!(#core_types::gpoll::GraphError::new("reduce batch failed")));
// A reducer's subject on a deeper wire folds the flat span
// of the consumer's lane: the flat convention encodes the
// outer coordinate in the range, not the chain.
let start = match derived_materialized(index) {
true => quote! {
match #core_types::node::Node::<#ctx_ident>::layout(&self.#name).depth > #levels {
true => #core_types::context::ExtractIndex::innermost_index(__input) * __count as u64,
false => 0,
}
},
false => quote!(0),
};
quote! {
let __arena = #core_types::context::ExtractArena::arena(__input);
let __count = match #core_types::node::Node::extent(&self.#name, __input, #core_types::gpoll::Level::Below(#levels)) {
@@ -1122,7 +1143,8 @@ pub(crate) fn generate_node_impl(crate_ident: &CrateIdent, parsed: &ParsedNodeFn
#core_types::gpoll::GPoll::Pending => #pending,
_ => #non_exact,
};
let __batch = match #core_types::record::materialize_batch(&self.#name, __input, 0..__count as u64, __arena) {
let __start: u64 = #start;
let __batch = match #core_types::record::materialize_batch(&self.#name, __input, __start..__start + __count as u64, __arena) {
#core_types::node::BatchStatus::Lent(__batch, _) => __batch,
#core_types::node::BatchStatus::Filled(__batch, _) => __batch.into_shared(),
#core_types::node::BatchStatus::Pending => #pending,
@@ -1366,6 +1388,14 @@ pub(crate) fn generate_node_impl(crate_ident: &CrateIdent, parsed: &ParsedNodeFn
#path(self, __input, __level)
}
}
} else if let Some((subject_index, folded_levels)) = ir::folded_subject(&node).filter(|_| node.output.shape.depth == 0) {
// A reducer's output keeps the subject's levels above the folded ones.
let name = &regular_fields[subject_index as usize].pat_ident.ident;
quote! {
fn extent_at(&self, __input: &#ctx_ident, __level: u8) -> #core_types::gpoll::GPoll<#core_types::gpoll::Extent> {
#core_types::node::Node::extent_at(&self.#name, __input, __level + #folded_levels)
}
}
} else {
quote!()
};