What is the allocation strategy of your allocator? #46

btgvesta · 2025-09-16T22:22:59Z

btgvesta
Sep 16, 2025

What is the allocation strategy of your allocator in your C23 solution?

Answered by bagaffey

In the allocator, mem allocation is handled by PushSize_.

PushSize_ calculates the actual size needed with alignment padding.
Checks the current memory block to see that it has enough space.
If there's not enough space, it allocates a new memory block at either the minimum or big enough size. It then chains this block onto the memory arena.
It hands back the pointer into the block (which is Result).
If the allocation was flagged to be cleared to 0 (ArenaFlag_ClearToZero), the new memory block is zero initialized.

bagaffey · 2025-09-16T22:31:09Z

In the allocator, mem allocation is handled by PushSize_.

PushSize_ calculates the actual size needed with alignment padding.
Checks the current memory block to see that it has enough space.
If there's not enough space, it allocates a new memory block at either the minimum or big enough size. It then chains this block onto the memory arena.
It hands back the pointer into the block (which is Result).
If the allocation was flagged to be cleared to 0 (ArenaFlag_ClearToZero), the new memory block is zero initialized.

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