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rust/compiler/rustc_codegen_ssa
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Mark Rousskov 4c002fce9d 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.
2024-05-27 16:26:56 -04:00
..
src Omit non-needs_drop drop_in_place in vtables 2024-05-27 16:26:56 -04:00
Cargo.toml Make SSA aggregates without needing an alloca 2024-05-08 20:38:04 -07:00
messages.ftl emit an error if we can't find a path to the self-contained linker 2024-05-23 15:47:35 +00:00
README.md mv compiler to compiler/ 2020-08-30 18:45:07 +03:00

README.md

Please read the rustc-dev-guide chapter on Backend Agnostic Codegen.