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Reject unsupported naked functions

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Transition unsupported naked functions future incompatibility lint into
an error:

* Naked functions must contain a single inline assembly block.
  Introduced as future incompatibility lint in 1.50 #79653.
  Change into an error fixes a soundness issue described in #32489.

* Naked functions must not use any forms of inline attribute.
  Introduced as future incompatibility lint in 1.56 #87652.
This commit is contained in:
Tomasz Miąsko 2022-01-21 00:00:00 +00:00
parent 84e918971d
commit 888332fee4
9 changed files with 182 additions and 295 deletions
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1
compiler/rustc_error_codes/src/error_codes.rs
View file

@ -486,6 +486,7 @@ E0783: include_str!("./error_codes/E0783.md"),
E0784: include_str!("./error_codes/E0784.md"),
E0785: include_str!("./error_codes/E0785.md"),
E0786: include_str!("./error_codes/E0786.md"),
E0787: include_str!("./error_codes/E0787.md"),
;
// E0006, // merged with E0005
// E0008, // cannot bind by-move into a pattern guard

28
compiler/rustc_error_codes/src/error_codes/E0787.md Normal file
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@ -0,0 +1,28 @@
An unsupported naked function definition.
Erroneous code example:
```compile_fail,E0787
#![feature(naked_functions)]
#[naked]
pub extern "C" fn f() -> u32 {
42
}
```
The naked functions must be defined using a single inline assembly
block.
The execution must never fall through past the end of the assembly
code so the block must use `noreturn` option. The asm block can also
use `att_syntax` and `raw` options, but others options are not allowed.
The asm block must not contain any operands other than `const` and
`sym`.
### Additional information
For more information, please see [RFC 2972].
[RFC 2972]: https://github.com/rust-lang/rfcs/blob/master/text/2972-constrained-naked.md