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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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23
xo-alloc2/include/xo/alloc2/DArena.hpp
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@ -26,6 +26,22 @@ namespace xo {
* (provided you use their full extent :)
**/
std::size_t hugepage_z_ = 2 * 1024 * 1024;
/** true to store header (8 bytes) at the beginning of each allocation.
* necessary and sufficient to allows iterating over allocs
* present in arena
**/
bool store_header_flag_ = false;
/** if non-zero, allocate extra space between allocs, and fill
* with fixed test-pattern contents. Allows for simple
* runtime arena sanitizing checks.
* Will be rounded up to multiple of @ref padding::c_alloc_alignment
**/
std::size_t guard_z_ = 0;
/** if store_header_flag_ is true: mask bits for allocation size.
* remaining bits can be stolen for other purposes
* otherwise ignored
**/
std::uint64_t header_size_mask_ = 0xffffffff;
/** true to enable debug logging **/
bool debug_flag_ = false;
@ -59,6 +75,8 @@ namespace xo {
using size_type = std::size_t;
/** @brief a contiguous memory range **/
using range_type = std::pair<std::byte*,std::byte*>;
/** @brief type for allocation header (if enabled) **/
using header_type = std::uint64_t;
///@}
@ -103,6 +121,11 @@ namespace xo {
**/
size_type committed_z_ = 0;
/** if config_.store_header_flag_:
* Pointer to header for last allocation.
**/
header_type * last_header_ = nullptr;
/** free pointer.
* Memory in range [@ref lo_, @ref free_) current in use
**/