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Auto merge of #122629 - RalfJung:assert-unsafe-precondition, r=saethlin

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refactor check_{lang,library}_ub: use a single intrinsic

This enacts the plan I laid out [here](https://github.com/rust-lang/rust/pull/122282#issuecomment-1996917998): use a single intrinsic, called `ub_checks` (in aniticpation of https://github.com/rust-lang/compiler-team/issues/725), that just exposes the value of `debug_assertions` (consistently implemented in both codegen and the interpreter). Put the language vs library UB logic into the library.

This makes it easier to do something like https://github.com/rust-lang/rust/pull/122282 in the future: that just slightly alters the semantics of `ub_checks` (making it more approximating when crates built with different flags are mixed), but it no longer affects whether these checks can happen in Miri or compile-time.

The first commit just moves things around; I don't think these macros and functions belong into `intrinsics.rs` as they are not intrinsics.

r? `@saethlin`
This commit is contained in:
bors 2024-03-23 21:11:00 +00:00
commit 2f090c30dd
48 changed files with 313 additions and 291 deletions
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5
compiler/rustc_hir_analysis/src/check/intrinsic.rs
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@ -127,8 +127,7 @@ pub fn intrinsic_operation_unsafety(tcx: TyCtxt<'_>, intrinsic_id: LocalDefId) -
| sym::variant_count
| sym::is_val_statically_known
| sym::ptr_mask
| sym::check_language_ub
| sym::check_library_ub
| sym::ub_checks
| sym::fadd_algebraic
| sym::fsub_algebraic
| sym::fmul_algebraic
@ -571,7 +570,7 @@ pub fn check_intrinsic_type(
(0, 0, vec![Ty::new_imm_ptr(tcx, Ty::new_unit(tcx))], tcx.types.usize)
}
sym::check_language_ub | sym::check_library_ub => (0, 1, Vec::new(), tcx.types.bool),
sym::ub_checks => (0, 1, Vec::new(), tcx.types.bool),
sym::simd_eq
| sym::simd_ne