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Rollup merge of #128138 - folkertdev:asm-option-allowlist, r=lcnr

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`#[naked]`: use an allowlist for allowed options on `asm!` in naked functions

tracking issue: https://github.com/rust-lang/rust/issues/90957

this is mostly just a refactor, but using an allowlist (rather than a denylist) for which asm options are allowed in naked functions is a little safer.

These options are disallowed because naked functions are effectively global asm, but defined using inline asm.
This commit is contained in:
Matthias Krüger 2024-07-25 16:48:20 +02:00 • committed by GitHub
commit e76bb3fab6
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6 changed files with 49 additions and 72 deletions
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21
compiler/rustc_passes/src/naked_functions.rs
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@ -244,22 +244,19 @@ impl<'tcx> CheckInlineAssembly<'tcx> {
self.tcx.dcx().emit_err(NakedFunctionsOperands { unsupported_operands });
}
let unsupported_options: Vec<&'static str> = [
(InlineAsmOptions::MAY_UNWIND, "`may_unwind`"),
(InlineAsmOptions::NOMEM, "`nomem`"),
(InlineAsmOptions::NOSTACK, "`nostack`"),
(InlineAsmOptions::PRESERVES_FLAGS, "`preserves_flags`"),
(InlineAsmOptions::PURE, "`pure`"),
(InlineAsmOptions::READONLY, "`readonly`"),
]
.iter()
.filter_map(|&(option, name)| if asm.options.contains(option) { Some(name) } else { None })
.collect();
let supported_options =
InlineAsmOptions::RAW | InlineAsmOptions::NORETURN | InlineAsmOptions::ATT_SYNTAX;
let unsupported_options = asm.options.difference(supported_options);
if !unsupported_options.is_empty() {
self.tcx.dcx().emit_err(NakedFunctionsAsmOptions {
span,
unsupported_options: unsupported_options.join(", "),
unsupported_options: unsupported_options
.human_readable_names()
.into_iter()
.map(|name| format!("`{name}`"))
.collect::<Vec<_>>()
.join(", "),
});
}