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xo-ordinaltree: expand unittest + debug logging

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This commit is contained in:
Roland Conybeare 2025-12-05 18:38:29 -05:00
commit 3d06980b42
10 changed files with 298 additions and 71 deletions
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86
xo-allocutil/include/xo/allocutil/gc_allocator_traits.hpp
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@ -40,6 +40,19 @@ namespace xo {
virtual std::size_t _forward_children(gc::IAlloc *) { assert(false); return 0; }
};
/** dummy GC interface.
* non-empty intersection with IAlloc
**/
template <typename GcObjectInterface>
struct FallbackGcInterface {
template <typename Allocator>
FallbackGcInterface(Allocator & alloc) {}
bool check_write_barrier(const void * parent,
const void * const * lhs,
bool may_throw) { return true; };
};
/** Extended version of
* std::allocator_traits<Allocator>
* Introduces additional i/face methods
@ -136,6 +149,8 @@ namespace xo {
using super::allocate;
using super::deallocate;
// ----------------------------------------------------------------
// default: allocator A fallback to standard non-gc allocator behavior
template <typename A, typename = void>
struct has_incremental_gc_interface : std::false_type {};
@ -148,6 +163,19 @@ namespace xo {
struct has_incremental_gc_interface<A, std::void_t<typename A::has_incremental_gc_interface>> :
A::has_incremental_gc_interface {};
/** true iff this allocator advertises itself as an incremental collector.
* Allocator will include:
*
* struct IAlloc {
* using has_incremental_gc_interface = std::true_type;
* };
**/
static inline constexpr
bool
has_incremental_gc_interface_v = has_incremental_gc_interface<Allocator>::value;
// ----------------------------------------------------------------
// default: allocate A fallback to standard non-GC allocator behavior
template <typename A, typename = void>
struct has_trivial_deallocate : std::false_type {};
@ -160,6 +188,19 @@ namespace xo {
struct has_trivial_deallocate<A, std::void_t<typename A::has_trivial_deallocate>> :
A::has_trivial_deallocate {};
/** true iff this allocator advertises trivial deallocate
* Allocate will include:
*
* struct IAlloc {
* using has_trivial_deallocate = std::true_type;
* };
**/
static inline constexpr
bool
has_trivial_deallocate_v = has_trivial_deallocate<Allocator>::value;
// ----------------------------------------------------------------
// default: empty object interface.
//
// classes that want to conditionally support GC
@ -187,27 +228,32 @@ namespace xo {
//
using object_interface_type = object_interface<Allocator>;
/** true iff this allocator advertises itself as an incremental collector.
* Allocator will include:
*
* struct IAlloc {
* using has_incremental_gc_interface = std::true_type;
* };
**/
static inline constexpr
bool
has_incremental_gc_interface_v = has_incremental_gc_interface<Allocator>::value;
// ----------------------------------------------------------------
// default: minimal garbage collector interface.
//
// Use in allocator-aware components that need conditionally
// to engage with GC functionality.
// For example in RedBlackTree::verify_ok() want to check
// cross-generational pointers.
//
// gc_interface gc
// - gc_interface(A & alloc)
// - gc.check_write_barrier(const object_interface_type * p,
// const object_interface_type * const * lhs,
// bool may_throw)
//
template <typename A, typename = void>
struct gc_interface : public FallbackGcInterface<object_interface_type> {};
// allocator opt-in by providing a gc_interface type
template <typename A>
struct gc_interface<A, std::void_t<typename A::gc_interface>> : public A::gc_interface {};
// interface for (narrow) GC interaction.
// Construct from allocator
using gc_interface_type = gc_interface<Allocator>;
/** true iff this allocator advertises trivial deallocate
* Allocate will include:
*
* struct IAlloc {
* using has_trivial_deallocate = std::true_type;
* };
**/
static inline constexpr
bool
has_trivial_deallocate_v = has_trivial_deallocate<Allocator>::value;
};
} /*namespace gc*/
} /*namespace xo*/