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Seems this strat is still fine...

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This commit is contained in:
Edward R. Gonzalez
2025-02-06 11:39:43 -05:00
parent 4221064785
commit bfef61bd0b
5 changed files with 260 additions and 187 deletions
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code/base/memory_substrate.c
+56 -28
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@@ -226,7 +226,7 @@ VArena varena__alloc(VArenaParams params)
}
#endif
SPTR header_size = size_of(VArena);
SPTR header_size = align_pow2(size_of(VArena), MD_DEFAULT_MEMORY_ALIGNMENT);
asan_unpoison_memory_region(base, header_size);
VArena* vm = rcast(VArena*, base);
@@ -257,15 +257,10 @@ void* varena_allocator_proc(void* allocator_data, AllocatorMode mode, SSIZE requ
{
assert(requested_size != 0);
UPTR alignment_offset = 0;
requested_size = align_pow2(requested_size, alignment);
UPTR current_offset = vm->reserve_start + vm->commit_used;
UPTR mask = scast(UPTR, alignment) - 1;
if ((current_offset & mask) != 0) {
alignment_offset = alignment - (current_offset & mask);
}
UPTR size_to_allocate = requested_size + alignment_offset;
UPTR size_to_allocate = requested_size;
UPTR to_be_used = vm->commit_used + size_to_allocate;
UPTR header_offset = vm->reserve_start - scast(UPTR, vm);
@@ -275,7 +270,13 @@ void* varena_allocator_proc(void* allocator_data, AllocatorMode mode, SSIZE requ
if (needs_more_commited)
{
SPTR reserve_left = vm->reserve - vm->committed;
UPTR next_commit_size = reserve_left > 0 ? vm->commit_size : scast(UPTR, align_pow2( -reserve_left, os_get_system_info()->page_size));
UPTR next_commit_size;
if (vm->flags & VArenaFlag_LargePages) {
next_commit_size = reserve_left > 0 ? vm->commit_size : scast(UPTR, align_pow2( -reserve_left, os_get_system_info()->large_page_size));
}
else {
next_commit_size = reserve_left > 0 ? vm->commit_size : scast(UPTR, align_pow2(abs(reserve_left), os_get_system_info()->page_size));
}
if (next_commit_size) {
B32 commit_result = os_commit(vm, next_commit_size);
if (commit_result == false) {
@@ -284,7 +285,7 @@ void* varena_allocator_proc(void* allocator_data, AllocatorMode mode, SSIZE requ
}
}
allocated_mem = rcast(void*, current_offset + alignment_offset);
allocated_mem = rcast(void*, current_offset + size_to_allocate);
vm->commit_used += size_to_allocate
}
break;
@@ -306,15 +307,22 @@ void* varena_allocator_proc(void* allocator_data, AllocatorMode mode, SSIZE requ
assert(old_size > 0);
assert_msg(old_size == requested_size, "Requested resize when none needed");
UPTR alignment_offset = scast(UPTR, old_memory) & (scast(UPTR, alignment) - 1);
assert_msg(alignment_offset != 0 && requested_size >= old_size, "Requested shrink from VArena");
requested_size = align_pow2(requested_size, alignment);
old_size = align_pow2(old_size, alignment);
UPTR old_memory_offset = scast(UPTR, old_memory) + scast(UPTR, old_size);
UPTR current_offset = scast(UPTR, vm->reserve_start) + scast(UPTR, vm->commit_used);
assert_msg(old_memory_offset == current_offset, "Cannot resize existing allocation in VArena to a larger size unless it was the last allocated");
assert_msg(old_memory_offset == current_offset, "Cannot resize existing allocation in VArena unless it was the last allocated");
UPTR size_to_allocate = requested_size - old_size + alignment_offset;
B32 requested_shrink = requested_size >= old_size;
if (requested_shrink) {
vm->commit_used -= rcast(UPTR, align_pow2(requested_size, alignment));
allocated_mem = old_memory;
break;
}
UPTR size_to_allocate = requested_size - old_size, alignment;
UPTR header_offset = vm->reserve_start - scast(UPTR, vm);
UPTR commit_left = vm->committed - vm->commit_used - header_offset;
@@ -322,7 +330,13 @@ void* varena_allocator_proc(void* allocator_data, AllocatorMode mode, SSIZE requ
if (needs_more_commited)
{
SPTR reserve_left = vm->reserve - vm->committed;
UPTR next_commit_size = reserve_left > 0 ? vm->commit_size : scast(UPTR, align_pow2( -reserve_left, os_get_system_info()->page_size));
UPTR next_commit_size;
if (vm->flags & VArenaFlag_LargePages) {
next_commit_size = reserve_left > 0 ? vm->commit_size : scast(UPTR, align_pow2( -reserve_left, os_get_system_info()->large_page_size));
}
else {
next_commit_size = reserve_left > 0 ? vm->commit_size : scast(UPTR, align_pow2(abs(reserve_left), os_get_system_info()->page_size));
}
if (next_commit_size) {
B32 commit_result = os_commit(vm, next_commit_size);
if (commit_result == false) {
@@ -331,21 +345,14 @@ void* varena_allocator_proc(void* allocator_data, AllocatorMode mode, SSIZE requ
}
}
allocated_mem = old_memory;
allocated_mem = old_memory;
vm->commit_used += size_to_allocate
}
break;
// case AllocatorMode_Pop:
// {
// }
// break;
// case AllocatorMode_Pop_To:
// {
// }
// break;
case AllocatorMode_QueryType:
@@ -378,10 +385,11 @@ void* farena_allocator_proc(void* allocator_data, AllocatorMode mode, SSIZE size
SSIZE total_size = align_pow2(size, alignment);
if (arena->used + total_size > arena->slice.len ) {
// Out of memory
return allocated_mem;
}
allocated_mem = align_pow2(end, alignment);
allocated_mem = end;
arena->used += total_size;
}
break;
@@ -399,13 +407,33 @@ void* farena_allocator_proc(void* allocator_data, AllocatorMode mode, SSIZE size
case AllocatorMode_Resize:
{
allocated_mem = default_resize_align(farena_allocator(arena), old_memory, old_size, size, alignment);
assert(old_memory != nullptr);
assert(old_size > 0);
assert_msg(old_size == size, "Requested resize when none needed");
size = align_pow2(size, alignment);
old_size = align_pow2(size, alignment);
SPTR old_memory_offset = scast(SPTR, old_memory) + old_size;
SPTR current_offset = scast(SPTR, arena->slice.data) + arena->used;
assert_msg(old_memory_offset == current_offset, "Cannot resize existing allocation in VArena unless it was the last allocated");
B32 requested_shrink = size >= old_size;
if (requested_shrink) {
arena->used -= size;
allocated_mem = old_memory;
break;
}
allocated_mem = old_memory;
arena->used += size;
}
break;
// case AllocatorMode_Pop:
// break;
// case AllocatorMode_Pop_To:
// break;
@@ -414,7 +442,7 @@ void* farena_allocator_proc(void* allocator_data, AllocatorMode mode, SSIZE size
break;
case AllocatorMode_QuerySupport:
return (void*) (AllocatorQuery_Alloc | AllocatorQuery_Free | AllocatorQuery_FreeAll | AllocatorQuery_Resize
return (void*) (AllocatorQuery_Alloc | AllocatorQuery_FreeAll | AllocatorQuery_Resize
// | AllocatorQuery_Pop | AllocatorQuery_Pop_To
);
break;