https://github.com/rust-lang/rust http://git.dreamy.place/mirrors/rust/atom?h=1.80.1 2024-05-27T20:26:56+00:00 2024-05-27T20:26:56+00:00 Mark Rousskov mark.simulacrum@gmail.com 2024-03-17T21:42:37+00:00 urn:sha1:4c002fce9d8421096538273c9b78db7d68529b94 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.