ByteDance Terminal Technology

Mar 15, 2022 · Mobile Development

Understanding Fixup Chain: Apple’s New Dynamic Linking Technique in iOS 15

Fixup chain, introduced in iOS 15, replaces the previous compressed‑byte‑stream rebase/bind format with a linked‑list style structure that stores dynamic‑link information more compactly, improves space locality, reduces binary size, and speeds up app launch by allowing a single pass rebase and bind process.