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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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36
src/alloc2/IAllocator_DArena.cpp
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@ -3,15 +3,20 @@
* @author Roland Conybeare, Dec 2025
**/
#include "AllocIterator.hpp"
#include "arena/IAllocator_DArena.hpp"
#include "arena/IAllocIterator_DArenaIterator.hpp" // for alloc_range
#include "arena/DArenaIterator.hpp"
#include "padding.hpp"
#include "xo/indentlog/scope.hpp"
#include <xo/facet/obj.hpp>
#include <xo/indentlog/scope.hpp>
#include <cassert>
#include <cstddef>
#include <cstring>
#include <sys/mman.h>
namespace xo {
using xo::facet::with_facet;
using std::size_t;
using std::byte;
@ -65,6 +70,35 @@ namespace xo {
return s.alloc_info(mem);
}
void dummy(const DArena & s) {
byte * begin_mem = nullptr;
DArenaIterator * ix = new (begin_mem) DArenaIterator(&s, DArenaIterator::begin_header(&s));
obj<AAllocIterator,DArenaIterator> ix_vt{ix};
}
auto
IAllocator_DArena::alloc_range(const DArena & s,
DArena & ialloc) noexcept -> range_type
{
byte * begin_mem = IAllocator_DArena::alloc(ialloc,
sizeof(DArenaIterator));
byte * end_mem = IAllocator_DArena::alloc(ialloc,
sizeof(DArenaIterator));
assert(begin_mem);
assert(end_mem);
DArenaIterator * begin_ix = new (begin_mem) DArenaIterator(&s, DArenaIterator::begin_header(&s));
DArenaIterator * end_ix = new ( end_mem) DArenaIterator(&s, DArenaIterator::end_header(&s));
obj<AAllocIterator> begin_obj = with_facet<AAllocIterator>::mkobj(begin_ix);
obj<AAllocIterator> end_obj = with_facet<AAllocIterator>::mkobj( end_ix);
return std::make_pair(begin_obj, end_obj);
}
bool
IAllocator_DArena::expand(DArena & s, size_t target_z) noexcept
{