[pull] master from ruby:master#978
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pull[bot] merged 8 commits intoturkdevops:masterfrom May 2, 2026
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This adds specialization for Class#allocate to perform the same inlining that Class#new will do. This was done conservatively, only inlining when we see a known leaf allocator so that there's no difference between interpreter and JIT if the allocator happenes to observe the stack.
It was dropped in 932dd9f
Otherwise some code defining ivars on a naked object early during program boot can cause all objects to be larger than needed. This seem like it was always the intention, but wasn't quite properly prevented. Also stop updating `max_iv_count` during GC marking as it is redundant.
Simplify the API by taking a shape_id upon creation.
Embed and shrink the capacities array so that it can be queried more efficiently. Move `next_shape_id` and `cache_size` outside of the struct on their own cache line, as they're expected to be incremented atomically from concurrent threads, so we want to avoid false sharing. The also don't need to be exposed to the rest of the VM. Get rid of `root_shape` as it's always equal to `shape_list`.
This shrinks the `rb_shape_t` struct from 40B to 32B.
Extracted from: #16817 It's likely that it will be u8 soon.
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