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xo-alloc2: streamlining + bugfixes [wip]

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This commit is contained in:
Roland Conybeare 2025-12-12 19:44:38 -05:00
commit 6cf535eaef
11 changed files with 312 additions and 10 deletions
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22
xo-alloc2/include/xo/alloc2/AAllocator.hpp
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@ -23,6 +23,10 @@ namespace xo {
reserve_exhausted,
/** unable to commit (i.e. mprotect failure) **/
commit_failed,
/** allocation size too big (See @ref ArenaConfig::header_size_mask_) **/
header_size_mask,
/** sub_alloc not preceded by super alloc (or another sub_alloc) **/
orphan_sub_alloc,
};
struct AllocatorError {
@ -67,6 +71,10 @@ namespace xo {
///@{
/** @brief type used for allocation amounts **/
using size_type = std::size_t;
/** @brief type used for allocation responses **/
using value_type = std::byte *;
/** object header, if configured **/
using header_type = std::uint64_t;
///@}
/*
@ -121,7 +129,19 @@ namespace xo {
**/
virtual bool expand(Opaque d, std::size_t z) const noexcept = 0;
/** allocate @p z bytes of memory from allocator @p d. **/
virtual std::byte * alloc(Opaque d, std::size_t z) const = 0;
virtual value_type alloc(Opaque d, size_type z) const = 0;
/** like @ref alloc, but follow with one or more consecutive
* @ref sub_alloc() calls. This sequence of allocs will share
* the initial allocation header.
**/
virtual value_type super_alloc(Opaque d, size_type z) const = 0;
/** follow a preceding @ref super_alloc call with additional
* subsidiary allocs that share the same object header.
* Must finish sequence with exactly one sub_alloc call
* with @p complete_flag set. This sub_alloc call may have
* zero @p z
**/
virtual value_type sub_alloc(Opaque d, size_type z, bool complete_flag) const = 0;
/** reset allocator @p d to empty state **/
virtual void clear(Opaque d) const = 0;
/** destruct allocator @p d **/