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xo-alloc: check_write_barrier to verify mutation log

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This commit is contained in:
Roland Conybeare 2025-12-05 10:00:36 -05:00
commit b6ccde3ddc
5 changed files with 133 additions and 4 deletions
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1
include/xo/alloc/ArenaAlloc.hpp
View file

@ -177,7 +177,6 @@ namespace xo {
virtual std::byte * alloc(std::size_t z) final override;
virtual bool check_owned(IObject * src) const final override;
ArenaAlloc & operator=(const ArenaAlloc &) = delete;
ArenaAlloc & operator=(ArenaAlloc &&) = delete;

16
include/xo/alloc/GC.hpp
View file

@ -337,6 +337,12 @@ namespace xo {
* - incr GC -> if not tenured
**/
virtual bool check_move(IObject * src) const final override;
/** if src is cross-generational (or cross-checkpoint), verify that it
* is recorded in mutation log,
* given an object @p parent that contains object pointer @p lhs
**/
virtual bool check_write_barrier(IObject * parent, IObject ** lhs, bool may_throw) const final;
virtual std::byte * alloc(std::size_t z) final override;
virtual std::byte * alloc_gc_copy(std::size_t z, const void * src) final override;
@ -447,7 +453,15 @@ namespace xo {
std::vector<IObject**> gc_root_v_;
/** log cross-generational and cross-checkpoint mutations.
* These need to be adjusted on next incremental collection
* These need to be adjusted on next incremental collection.
*
* mutation_log_[tospace] accumulates {xgen,xckp} pointers until
* the next GC.
*
* See GC aux functions
* @ref incremental_gc_forward_mlog
* @ref full_gc_forward_mlog
*
**/
std::array<up<MutationLog>, role2int(role::N)> mutation_log_;
/** temporary mutation log (for deferred entries) **/

7
include/xo/alloc/generation.hpp
View file

@ -41,6 +41,13 @@ namespace xo {
return generation::tenured;
}
const char * genresult2str(generation_result x);
inline std::ostream & operator<<(std::ostream & os, generation_result x) {
os << genresult2str(x);
return os;
}
} /*namespace gc*/
} /*namespace xo*/