[pull] master from ruby:master#1192
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Co-authored-by: Jeremy Evans <code@jeremyevans.net>
Guard the `RUBY_NO_FREE` environment variable which disables `xfree` behind a compile-time flag `-DRUBY_NO_FREE`. It is a debugging feature, and should not exist in production environment.
Now that the shape contains the slot capacity, we should update the shape for all objects when moving them, not just T_OBJECT.
`rb_gc_obj_slot_size` has to check the page metadata to get the slot size, which likely cause cache misses. `rb_obj_shape_slot_size` does simple arithmetic using only a few shape bits. ``` compare-ruby: ruby 4.1.0dev (2026-07-08T03:48:16Z master 01c5b2e) +PRISM [arm64-darwin25] built-ruby: ruby 4.1.0dev (2026-07-08T10:17:41Z gc-changed-slot-size 08029b0) +PRISM [arm64-darwin25] warming up. ``` | |compare-ruby|built-ruby| |:-----------------------|-----------:|---------:| |binary_concat_embedded | 5.262M| 5.707M| | | -| 1.08x|
Expand the room for all items at once before unpacking them, instead of extending it one by one.
Convert optional argument `offset` after the mandatory arguments have done.
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