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refactor: use GCObjectVisitor api w/ gco_shallow_move

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Roland Conybeare 2026-04-06 15:21:48 -04:00
commit 3489699f5d
8 changed files with 51 additions and 15 deletions
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5
include/xo/alloc2/gc/AGCObject.hpp
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@ -67,8 +67,9 @@ public:
virtual void _drop(Opaque d) const noexcept = 0;
// nonconst methods
/** move instance using collector **/
virtual Opaque shallow_move(Opaque data, obj<ACollector> gc) const noexcept = 0;
/** move instance using object visitor.
Arguably abusing the word 'visitor' here **/
virtual Opaque gco_shallow_move(Opaque data, obj<AGCObjectVisitor> gc) const noexcept = 0;
/** 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 **/

2
include/xo/alloc2/gc/IGCObject_Any.hpp
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@ -64,7 +64,7 @@ namespace mm {
// const methods
// nonconst methods
[[noreturn]] Opaque shallow_move(Opaque, obj<ACollector>) const noexcept override;
[[noreturn]] Opaque gco_shallow_move(Opaque, obj<AGCObjectVisitor>) const noexcept override;
[[noreturn]] void visit_gco_children(Opaque, obj<AGCObjectVisitor>) const noexcept override;
///@}

4
include/xo/alloc2/gc/IGCObject_Xfer.hpp
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@ -53,8 +53,8 @@ namespace mm {
// const methods
// non-const methods
Opaque shallow_move(Opaque data, obj<ACollector> gc) const noexcept override {
return I::shallow_move(_dcast(data), gc);
Opaque gco_shallow_move(Opaque data, obj<AGCObjectVisitor> gc) const noexcept override {
return I::gco_shallow_move(_dcast(data), gc);
}
void visit_gco_children(Opaque data, obj<AGCObjectVisitor> fn) const noexcept override {
return I::visit_gco_children(_dcast(data), fn);

4
include/xo/alloc2/gc/RGCObject.hpp
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@ -58,8 +58,8 @@ public:
// const methods
// non-const methods (still const in router!)
Opaque shallow_move(obj<ACollector> gc) noexcept {
return O::iface()->shallow_move(O::data(), gc);
Opaque gco_shallow_move(obj<AGCObjectVisitor> gc) noexcept {
return O::iface()->gco_shallow_move(O::data(), gc);
}
void visit_gco_children(obj<AGCObjectVisitor> fn) noexcept {
return O::iface()->visit_gco_children(O::data(), fn);

20
include/xo/alloc2/gc/RGCObjectVisitor.hpp
View file

@ -46,9 +46,25 @@ public:
///@{
// explicit injected content
/** convenience: allocate copy for typed pointer **/
template <typename T>
void * alloc_copy_for(const T * src) noexcept {
return O::iface()->alloc_copy(O::data(), (std::byte *)const_cast<T *>(src));
}
/** visit forward faceted object child pointer in place.
Defined in RGCObject.hpp to avoid #include cycle
/** convenience: move typed pointer **/
template <typename T>
T * std_move_for(T * src) noexcept {
void * mem = this->alloc_copy_for(src);
if (mem) {
return new (mem) T(std::move(*src));
}
return nullptr;
}
/** visit a gcobject child pointer in place.
Defined in RCollector_aux.hpp to avoid #include cycle
(for historical reasons - coul d be in RGCObject_aux.hpp?)
**/
template <typename DRepr>
void visit_child(xo::facet::obj<AGCObject,DRepr> * p_obj);