RESOLVED FIXED303079
Remove use of CompactPtr for Structure::m_classInfo. 
https://bugs.webkit.org/show_bug.cgi?id=303079
Summary Remove use of CompactPtr for Structure::m_classInfo.
Mark Lam
Reported 2025-11-24 21:35:41 PST
ClassInfo is located in CONST_DATA, and it is not guaranteed that CONST_DATA will be located in the same 36-bit address range that applies to heap allocated memory. Also, sizeof(Structure) on iOS (and peers) is 104. With the removal of this CompactPtr, sizeof(Structure) increases to 112. However, on iOS, Structures require 32 atom (alignment), which takes its size class up to 128. This means the size increase will be completely inconsequential.
Attachments
Add attachment proposed patch, testcase, etc.
Radar WebKit Bug Importer
Comment 1 2025-11-24 21:36:10 PST
<rdar://problem/165381788>
Mark Lam
Comment 2 2025-11-24 21:48:42 PST
Pull request: https://github.com/WebKit/WebKit/pull/54434
EWS
Comment 3 2025-11-27 17:29:10 PST
Committed 303621@main (150dba5b9324): <https://commits.webkit.org/303621@main> Reviewed commits have been landed. Closing PR #54434 and removing active labels.
Note You need to log in before you can comment on or make changes to this bug.