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bors 8de4b13845 Auto merge of #104679 - dvdhrm:rw/dso, r=petrochenkov 
codegen-llvm: never combine DSOLocal and DllImport

Prevent DllImport from being attached to DSOLocal definitions in the LLVM IR. The combination makes no sense, since definitions local to the compilation unit will never be imported from external objects.

Additionally, LLVM will refuse the IR if it encounters the combination (introduced in [1]):

```
  if (GV.hasDLLImportStorageClass())
    Assert(!GV.isDSOLocal(),
           "GlobalValue with DLLImport Storage is dso_local!", &GV);
```

Right now, codegen-llvm will only apply DllImport to constants and rely on call-stubs for functions. Hence, we simply extend the codegen of constants to skip DllImport for any local definitions.

This was discovered when switching the EFI targets to the static relocation model [2]. With this fixed, we can start another attempt at this.

[1] 509132b368
[2] https://github.com/rust-lang/rust/issues/101656
2022-11-30 04:18:15 +00:00
..
src Auto merge of #104679 - dvdhrm:rw/dso, r=petrochenkov 2022-11-30 04:18:15 +00:00
Cargo.toml Auto merge of #99324 - reez12g:issue-99144, r=jyn514 2022-10-06 03:01:57 +00:00
README.md mv compiler to compiler/ 2020-08-30 18:45:07 +03:00

README.md

The codegen crate contains the code to convert from MIR into LLVM IR, and then from LLVM IR into machine code. In general it contains code that runs towards the end of the compilation process.

For more information about how codegen works, see the rustc dev guide.