llvm-project

154d2267 - [ObjC] Emit number, array, and dictionary literals as constants (#185130)

[ObjC] Emit number, array, and dictionary literals as constants (#185130) When targeting runtimes that support constant literal classes, emit ObjC literal expressions @(number), @[], and @{} as compile-time constant data structures rather than runtime msgSend calls. This reduces code size and runtime overhead at the cost of increased data segment size, and avoids repeated heap allocation of equivalent literal objects. The feature is not supported with the fragile ABI or GNU runtimes, where it is automatically disabled. The feature can be disabled altogether with -fno-objc-constant-literals, or individually per literal kind: -fno-constant-nsnumber-literals -fno-constant-nsarray-literals -fno-constant-nsdictionary-literals Custom backing class names can be specified via: -fconstant-array-class=<name> -fconstant-dictionary-class=<name> -fconstant-integer-number-class=<name> -fconstant-float-number-class=<name> -fconstant-double-number-class=<name> rdar://45380392 rdar://168106035 --------- Co-authored-by: Ben D. Jones <bendjones@apple.com>