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xo-alloc2: + Allocator.alloc_range() with DArena input

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This commit is contained in:
Roland Conybeare 2025-12-18 18:34:54 -05:00
commit 181ae9f12b
13 changed files with 158 additions and 59 deletions
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8
include/xo/alloc2/arena/DArenaIterator.hpp
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@ -59,6 +59,14 @@ namespace xo {
**/
static DArenaIterator end(const DArena * arena);
/** Address of allocation header for beginning of alloc range in @p arena **/
static AllocHeader * begin_header(const DArena * arena);
/** Address of allocation header for end of alloc range.
* This is the address of header for _next_ allocation in @p arena
* i.e. free pointer
**/
static AllocHeader * end_header(const DArena * arena);
/** A valid iterator can be compared, at least with itself
* It can be dereferenced if is also non-empty
**/

23
include/xo/alloc2/arena/IAllocator_DArena.hpp
View file

@ -19,15 +19,20 @@ namespace xo {
}
namespace mm {
/* changes here coordinate with:
* AAllocator AAllocator.hpp
* IAllocator_Any IAllocator_Any.hpp
* IAllocator_Xfer IAllocator_Xfer.hpp
* RAllocator RAllocator.hpp
*/
/** @class IAllocator_DArena
* @brief Provide AAllocator interface for DArena state
**/
struct IAllocator_DArena {
/* changes here coordinate with:
* AAllocator AAllocator.hpp
* IAllocator_Any IAllocator_Any.hpp
* IAllocator_Xfer IAllocator_Xfer.hpp
* RAllocator RAllocator.hpp
*/
using size_type = std::size_t;
using value_type = std::byte *;
using range_type = std::pair<obj<AAllocIterator>,
obj<AAllocIterator>>;
enum class alloc_mode : uint8_t {
standard,
@ -44,9 +49,13 @@ namespace xo {
static size_type allocated(const DArena &) noexcept;
static bool contains(const DArena &, const void * p) noexcept;
static AllocError last_error(const DArena &) noexcept;
/** retrieve allocation bookkeeping info for @p mem from arena @p d **/
static AllocInfo alloc_info(const DArena &, value_type mem) noexcept;
/** create alloc-iterator range over allocs on @d,
* Iterators themselves allocated from @p ialloc.
**/
static range_type alloc_range(const DArena & d, DArena & ialloc) noexcept;
/** expand committed space in arena @p d
* to size at least @p z
* In practice will round up to a multiple of @ref page_z_.