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- On Darwin, use MAP_JIT when allocating memory for cloned functions and call `pthread_jit_write_protect_np()` as needed. - On arm64, try to reserve memory within 128 MiB of the text/data segments, but allow addresses up to 4 GiB away. When a BL address is more than 128 MiB away insert a trampoline at the end of the function to branch to the fixed address. - On amd64, the search code still still applies, but we only need to be within range of a 32-bit signed int.
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MAP_JITwhen allocating memory for cloned functions and callpthread_jit_write_protect_np()as needed.