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refactor focusing on xo-alloc2/ xo-gc/ write-barrier

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ability to inform allocator of gco->gco mutation, via AAllocator i/face.
This commit is contained in:
Roland Conybeare 2026-05-01 19:54:26 -04:00
commit b780d1da4c
17 changed files with 149 additions and 18 deletions
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27
include/xo/alloc2/alloc/AAllocator.hpp
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@ -20,8 +20,8 @@ namespace xo {
using Copaque = const void *;
using Opaque = void *;
// see DArena.hpp
struct DArena;
class AGCObject; // see AGCObject.hpp
struct DArena; // see DArena.hpp
/** @class AAllocator
* @brief Abstract facet for allocation
@ -34,6 +34,7 @@ namespace xo {
public:
/** @defgroup mm-allocator-type-traits allocator type traits **/
///@{
using AGCObject = xo::mm::AGCObject;
/** memory size report **/
using MemorySizeInfo = xo::mm::MemorySizeInfo;
/** type used for allocation amounts **/
@ -155,6 +156,28 @@ namespace xo {
virtual value_type alloc_copy(Opaque d, value_type src) const = 0;
/** reset allocator @p d to empty state. **/
virtual void clear(Opaque d) const = 0;
/** assign helper for allocator that may require a write barrier
* (for example Collector). Using obj<AGCObject> here causes
* include cycle, use spelled out form instead;
*
* For:
* obj<AGCObject> lhs_ = rhs
* with allocator d, that owns some allocaiton p, would use
* mm.barrier_assign_aux(d, p,
* lhs_.iface(), lhs_.opaque_data_addr(),
* rhs.iface(), rhs.opaque_data());
* when lhs has known data type:
* DRepr * lhs_ = rhs.data();
* use
* mm.barrier_assign_aux(d, p,
* nullptr, lhs_.opaque_data_addr(),
* rhs.iface(), rhs.opaque_data());
* barrier needs to be able to construct complete fop for rhs
* to administrate write barrier.
**/
virtual void barrier_assign_aux(Opaque d, void * parent,
AGCObject * lhs_iface, void ** lhs_data,
AGCObject * rhs_iface, void * rhs_data) const = 0;
///@}
}; /*AAllocator*/