Commits on May 27, 2024

1. Omit non-needs_drop drop_in_place in vtables …

   This replaces the drop_in_place reference with null in vtables. On
   librustc_driver.so, this drops about ~17k dynamic relocations from the
   output, since many vtables can now be placed in read-only memory, rather
   than having a relocated pointer included.
   
   This makes a tradeoff by adding a null check at vtable call sites.
   That's hard to avoid without changing the vtable format (e.g., to use a
   pc-relative relocation instead of an absolute address, and avoid the
   dynamic relocation that way). But it seems likely that the check is
   cheap at runtime.

   

   Mark-Simulacrum committed May 27, 2024
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