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xo-alloc2: implement alloc for obj<AAllocator,DArena>

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This commit is contained in:
Roland Conybeare 2025-12-12 13:42:56 -05:00
commit 644100633d
3 changed files with 47 additions and 20 deletions
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51
xo-alloc2/src/alloc2/IAllocator_DArena.cpp
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@ -12,6 +12,7 @@
namespace xo {
using std::size_t;
using std::byte;
namespace mm {
@ -64,7 +65,7 @@ namespace xo {
xtag("target_z", target_z),
xtag("committed_z", s.committed_z_));
if (target_z <= s.committed_z_) {
if (target_z <= s.committed_z_) [[likely]] {
log && log("trivial success, offset within committed range",
xtag("target_z", target_z),
xtag("committed_z", s.committed_z_));
@ -142,15 +143,41 @@ namespace xo {
}
std::byte *
IAllocator_DArena::alloc(const DArena & s,
std::size_t z)
IAllocator_DArena::alloc(DArena & s,
std::size_t req_z)
{
(void)s;
(void)z;
scope log(XO_DEBUG(s.config_.debug_flag_));
// scope log(XO_DEBUG(config_.debug_flag_));
/* word size for alignment (8 bytes) */
constexpr size_t c_bpw = sizeof(std::uintptr_t);
assert(false);
std::uintptr_t free_u64 = reinterpret_cast<std::uintptr_t>(s.free_);
assert(free_u64 % c_bpw == 0ul);
/* dz: pad req_z to multiple c_bpw */
size_t dz = padding::alloc_padding(req_z);
size_t z1 = req_z + dz;
assert(z1 % c_bpw == 0ul);
if (expand(s, allocated(s) + z1)) [[likely]] {
byte * mem = s.free_;
s.free_ += z1;
log && log(xtag("self", s.config_.name_),
xtag("z0", req_z),
xtag("+pad", dz),
xtag("z1", z1),
xtag("size", size(s)),
xtag("avail", available(s)));
return mem;
} else {
/* error already captured */
return nullptr;
}
}
void
@ -160,11 +187,11 @@ namespace xo {
//s.checkpoint_ = s.lo_;
}
void
IAllocator_DArena::destruct_data(DArena & s)
{
s.~DArena();
}
void
IAllocator_DArena::destruct_data(DArena & s)
{
s.~DArena();
}
} /*namespace mm*/
} /*namespace xo*/