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refactor: + narrower interface for gc pointer forwarding

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add AGCObjectVisitor, instead of requiring ACollector.
This commit is contained in:
Roland Conybeare 2026-04-05 23:53:02 -04:00
commit 90ab86f69c
9 changed files with 115 additions and 13 deletions
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18
idl/GCObject.json5
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@ -6,6 +6,7 @@
includes: [
"<xo/alloc2/Allocator.hpp>",
"<xo/alloc2/Collector.hpp>",
"<xo/alloc2/GCObjectVisitor.hpp>",
"<cstdint>",
"<cstddef>",
],
@ -42,6 +43,11 @@
doc: ["fomo collector type"],
definition: "xo::mm::ACollector",
},
{
name: "AGCObjectVisitor",
doc: ["fomo collector type"],
definition: "xo::mm::AGCObjectVisitor",
},
],
const_methods: [
// size_type shallow_size() const noexcept
@ -68,13 +74,17 @@
noexcept: true,
attributes: [],
},
// size_type forward_children(obj<ACollector>) noexcept
// size_type visit_gco_children(obj<AGCObjectVisitor>) noexcept
{
name: "forward_children",
doc: ["during GC: forward immdiate children"],
name: "visit_gco_children",
doc: [
"Invoke fn.visit_child(iface,data) for each child GCObject pointer.",
"Context: provides address of data pointer so it can be updated in place",
"when @p fn invokes garbage collector reentry point"
],
return_type: "void",
args: [
{type: "obj<ACollector>", name: "gc"},
{type: "obj<AGCObjectVisitor>", name: "fn"},
],
const: true,
noexcept: true,