tree 689c10c265a2f97d5632580831ea57ddf04f9754
parent e7146d4bca85359d1a019043908dcb9ba246191d
author Kyungwoo Lee <kyulee@meta.com> 1706023894 -0800
committer Copybara-Service <copybara-worker@google.com> 1706024016 -0800

[lld-macho][arm64] implement -objc_stubs_small (#78665)

This patch implements `-objc_stubs_small` targeting arm64, aiming to
align with ld64's behavior.
1. `-objc_stubs_fast`: As previously implemented, this always uses the
Global Offset Table (GOT) to invoke `objc_msgSend`. The alignment of the
objc stub is 32 bytes.
2. `-objc_stubs_small`: This behavior depends on whether `objc_msgSend`
is defined. If it is, it directly jumps to `objc_msgSend`. If not, it
creates another stub to indirectly jump to `objc_msgSend`, minimizing
the size. The alignment of the objc stub in this case is 4 bytes.

GitOrigin-RevId: 77e204c7b04f1f516db9a1dd5602e4a853bb0d1c