35 lines
1.2 KiB
Rust
35 lines
1.2 KiB
Rust
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//! Minimal GC tracing helpers (skeleton)
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//!
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//! Downcast-based child edge enumeration for builtin containers.
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//! This is a non-invasive helper to support diagnostics and future collectors.
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use std::sync::Arc;
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use crate::box_trait::NyashBox;
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/// Visit child boxes of a given object and invoke `visit(child)` for each.
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/// This function recognizes builtin containers (ArrayBox/MapBox) and is a no-op otherwise.
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pub fn trace_children(obj: &dyn NyashBox, visit: &mut dyn FnMut(Arc<dyn NyashBox>)) {
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// ArrayBox
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if let Some(arr) = obj.as_any().downcast_ref::<crate::boxes::array::ArrayBox>() {
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if let Ok(items) = arr.items.read() {
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for it in items.iter() {
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// Convert Box<dyn NyashBox> to Arc<dyn NyashBox>
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let arc: Arc<dyn NyashBox> = Arc::from(it.clone_box());
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visit(arc);
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}
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}
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return;
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}
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// MapBox
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if let Some(map) = obj.as_any().downcast_ref::<crate::boxes::map_box::MapBox>() {
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if let Ok(data) = map.get_data().read() {
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for (_k, v) in data.iter() {
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let arc: Arc<dyn NyashBox> = Arc::from(v.clone_box());
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visit(arc);
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}
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}
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return;
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}
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}
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