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xo-gc: bugfix collector forarding for virtual roots

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This commit is contained in:
Roland Conybeare 2026-03-26 15:02:43 -04:00
commit 25b3cf8d4d
2 changed files with 111 additions and 37 deletions
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19
include/xo/gc/DX1Collector.hpp
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@ -86,9 +86,10 @@ namespace xo {
struct VerifyStats {
void clear() { *this = VerifyStats(); }
std::uint32_t n_ext_ = 0;
std::uint32_t n_from_ = 0;
std::uint32_t n_to_ = 0;
std::uint32_t n_gc_root_ = 0;
std::uint32_t n_ext_ = 0;
std::uint32_t n_from_ = 0;
std::uint32_t n_to_ = 0;
};
// ----- DX1Collector -----
@ -98,6 +99,8 @@ namespace xo {
struct DX1Collector {
public:
using RootSet = DArenaVector<GCRoot>;
/* TODO: AllocIterator pointing to free pointer instead of std::byte* */
using GCMoveCheckpoint = std::array<std::byte *, c_max_generation>;
using MutationLog = DArenaVector<MutationLogEntry>;
using typeseq = xo::facet::typeseq;
using size_type = DArena::size_type;
@ -154,6 +157,8 @@ namespace xo {
/** true iff address @p addr allocated from this collector and currently live
* in role @p r (according to current GC state)
*
* (i.e. in [lo,free) for an arena)
**/
bool contains_allocated(role r, const void * addr) const noexcept;
@ -334,6 +339,14 @@ namespace xo {
void * _deep_move_interior(void * from_src, Generation upto);
/** Common driver for _deep_move_root(), _deep_move_interior() **/
void * _deep_move_gc_owned(void * from_src, Generation upto);
/** snap checkpoint containing allocator state
* use to detect forwarding activity after visiting objects
**/
GCMoveCheckpoint _snap_move_checkpoint(Generation upto);
/** traverse objects allocated after @p ckp, to make sure their children
* are forwarded. Repeat until traverse doesn't find any unforwarded children
**/
void _forward_children_until_fixpoint(Generation upto, GCMoveCheckpoint ckp);
/** Evacuate object at @p *lhs_data to to-space.
* Replace original with forwarding pointer to new location
**/