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Tagged Pointer Strings (2015)
May 8, 2024, 2:23 p.m. |
Simon Willison's Weblog simonwillison.net
Mike Ash digs into a fascinating implementation detail of macOS.
Tagged pointers provide a way to embed a literal value in a pointer reference. Objective-C pointers on macOS are 64 bit, providing plenty of space for representing entire values. If the least significant bit is 1 (the pointer is a 64 bit odd number) then the pointer is "tagged" and represents a value, not a memory reference.
Here's where things get really clever. Storing an integer …
embed implementation least macos objectivec reference space strings value values
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