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xo-alloc + xo-allocutil: refactor to shrink dep surface area

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This commit is contained in:
Roland Conybeare 2025-12-01 01:20:49 -05:00
commit 540b43d971
34 changed files with 479 additions and 323 deletions
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37
xo-alloc/include/xo/alloc/GC.hpp
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@ -88,29 +88,30 @@ namespace xo {
class MutationLogEntry {
public:
MutationLogEntry(Object * parent, Object ** lhs) : parent_{parent}, lhs_{lhs} {}
MutationLogEntry(IObject * parent, IObject ** lhs)
: parent_{parent}, lhs_{lhs} {}
Object * parent() const { return parent_; }
Object ** lhs() const { return lhs_; }
IObject * parent() const { return parent_; }
IObject ** lhs() const { return lhs_; }
Object * child() const { return *lhs_; }
IObject * child() const { return *lhs_; }
bool is_child_forwarded() const;
bool is_parent_forwarded() const;
Object * parent_destination() const;
IObject * parent_destination() const;
/** Flag obsolete mutation.
* Future proofing, never happens for regular objects
**/
bool is_dead() const { return false; }
MutationLogEntry update_parent_moved(Object * parent_to) const;
void fixup_parent_child_moved(Object * child_to) { *lhs_ = child_to; }
MutationLogEntry update_parent_moved(IObject * parent_to) const;
void fixup_parent_child_moved(IObject * child_to) { *lhs_ = child_to; }
private:
Object * parent_;
Object ** lhs_;
IObject * parent_ = nullptr;
IObject ** lhs_ = nullptr;
};
using MutationLog = std::vector<MutationLogEntry>;
@ -235,15 +236,15 @@ namespace xo {
/** add gc root at address @p addr . Gc will keep alive anything reachable
* from @c *addr
**/
void add_gc_root(Object ** addr);
void add_gc_root(IObject ** addr);
/** reverse the effect of previous call to @ref add_gc_root **/
void remove_gc_root(Object ** addr);
void remove_gc_root(IObject ** addr);
/** convenience wrapper **/
template <typename T>
void add_gc_root_dwim(gp<T> * p) { this->add_gc_root(reinterpret_cast<Object**>(p->ptr_address())); }
void add_gc_root_dwim(gp<T> * p) { this->add_gc_root(reinterpret_cast<IObject**>(p->ptr_address())); }
template <typename T>
void remove_gc_root_dwim(gp<T> * p) { this->remove_gc_root(reinterpret_cast<Object**>(p->ptr_address())); }
void remove_gc_root_dwim(gp<T> * p) { this->remove_gc_root(reinterpret_cast<IObject**>(p->ptr_address())); }
/** may optionally use this to observe GC copy phase.
* Will be invoked once _per surviving object_, so not cheap.
@ -308,17 +309,17 @@ namespace xo {
* @param lhs. address of a member variable within the allocation of @p parent.
* @param rhs. new target for @p *lhs
**/
virtual void assign_member(Object * parent, Object ** lhs, Object* rhs) final override;
virtual void assign_member(IObject * parent, IObject ** lhs, IObject* rhs) final override;
/** during GC check for source objects owned by GC.
* See Object::_shallow_move.
**/
virtual bool check_owned(Object * src) const final override;
virtual bool check_owned(IObject * src) const final override;
/** queries during GC to determine if object at address @p src should move:
* - full GC -> always
* - incr GC -> if not tenured
**/
virtual bool check_move(Object * src) const final override;
virtual bool check_move(IObject * src) const final override;
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;
@ -349,7 +350,7 @@ namespace xo {
/** scan to-space for object statistics before GC */
void capture_object_statistics(generation upto, capture_phase phase);
/** copy object **/
void copy_object(Object ** addr, generation upto, ObjectStatistics * object_stats);
void copy_object(IObject ** addr, generation upto, ObjectStatistics * object_stats);
/** copy everything reachable from global gc roots **/
void copy_globals(generation g);
/** review mutation log; may discover+rescue reachable objects.
@ -426,7 +427,7 @@ namespace xo {
* Application can introduce new root object pointers at any time provided GC not running,
* but cannot withdraw them.
**/
std::vector<Object**> gc_root_v_;
std::vector<IObject**> gc_root_v_;
/** log cross-generational and cross-checkpoint mutations.
* These need to be adjusted on next incremental collection