diff options
Diffstat (limited to 'gnu/packages/patches/rust-1.64-fix-riscv64-bootstrap.patch')
| -rw-r--r-- | gnu/packages/patches/rust-1.64-fix-riscv64-bootstrap.patch | 565 |
1 files changed, 565 insertions, 0 deletions
diff --git a/gnu/packages/patches/rust-1.64-fix-riscv64-bootstrap.patch b/gnu/packages/patches/rust-1.64-fix-riscv64-bootstrap.patch new file mode 100644 index 0000000000..4567f81224 --- /dev/null +++ b/gnu/packages/patches/rust-1.64-fix-riscv64-bootstrap.patch @@ -0,0 +1,565 @@ +https://github.com/rust-lang/rust/commit/263edd43c5255084292329423c61a9d69715ebfa.patch +https://github.com/rust-lang/rust/issues/102155 +Issue seen on native builds on riscv64 across multiple Linux +Distributions. An alternative workaround appears to be building stage 1 +with debug enabled. + +From 27412d1e3e128349bc515c16ce882860e20f037d Mon Sep 17 00:00:00 2001 +From: 5225225 <5225225@mailbox.org> +Date: Thu, 14 Jul 2022 22:42:47 +0100 +Subject: [PATCH] Use constant eval to do strict validity checks + +--- + Cargo.lock | 1 + + .../src/intrinsics/mod.rs | 15 +---- + compiler/rustc_codegen_ssa/Cargo.toml | 1 + + compiler/rustc_codegen_ssa/src/mir/block.rs | 9 ++- + .../src/const_eval/machine.rs | 2 +- + .../src/interpret/intrinsics.rs | 56 ++++++++-------- + compiler/rustc_const_eval/src/lib.rs | 6 ++ + .../src/might_permit_raw_init.rs | 40 +++++++++++ + compiler/rustc_middle/src/query/mod.rs | 8 +++ + compiler/rustc_middle/src/ty/query.rs | 1 + + compiler/rustc_query_impl/src/keys.rs | 12 +++- + compiler/rustc_target/src/abi/mod.rs | 38 +++++------ + .../intrinsics/panic-uninitialized-zeroed.rs | 66 ++++++++++++------- + 13 files changed, 161 insertions(+), 94 deletions(-) + create mode 100644 compiler/rustc_const_eval/src/might_permit_raw_init.rs + +diff --git a/Cargo.lock b/Cargo.lock +index 147d47044078a..dd6f0345affd0 100644 +--- a/Cargo.lock ++++ b/Cargo.lock +@@ -3664,6 +3664,7 @@ dependencies = [ + "rustc_arena", + "rustc_ast", + "rustc_attr", ++ "rustc_const_eval", + "rustc_data_structures", + "rustc_errors", + "rustc_fs_util", +diff --git a/compiler/rustc_codegen_cranelift/src/intrinsics/mod.rs b/compiler/rustc_codegen_cranelift/src/intrinsics/mod.rs +index eafae1cdc8af0..4b2207f375879 100644 +--- a/compiler/rustc_codegen_cranelift/src/intrinsics/mod.rs ++++ b/compiler/rustc_codegen_cranelift/src/intrinsics/mod.rs +@@ -58,7 +58,6 @@ pub(crate) use llvm::codegen_llvm_intrinsic_call; + use rustc_middle::ty::print::with_no_trimmed_paths; + use rustc_middle::ty::subst::SubstsRef; + use rustc_span::symbol::{kw, sym, Symbol}; +-use rustc_target::abi::InitKind; + + use crate::prelude::*; + use cranelift_codegen::ir::AtomicRmwOp; +@@ -672,12 +671,7 @@ fn codegen_regular_intrinsic_call<'tcx>( + return; + } + +- if intrinsic == sym::assert_zero_valid +- && !layout.might_permit_raw_init( +- fx, +- InitKind::Zero, +- fx.tcx.sess.opts.unstable_opts.strict_init_checks) { +- ++ if intrinsic == sym::assert_zero_valid && !fx.tcx.permits_zero_init(layout) { + with_no_trimmed_paths!({ + crate::base::codegen_panic( + fx, +@@ -688,12 +682,7 @@ fn codegen_regular_intrinsic_call<'tcx>( + return; + } + +- if intrinsic == sym::assert_uninit_valid +- && !layout.might_permit_raw_init( +- fx, +- InitKind::Uninit, +- fx.tcx.sess.opts.unstable_opts.strict_init_checks) { +- ++ if intrinsic == sym::assert_uninit_valid && !fx.tcx.permits_uninit_init(layout) { + with_no_trimmed_paths!({ + crate::base::codegen_panic( + fx, +diff --git a/compiler/rustc_codegen_ssa/Cargo.toml b/compiler/rustc_codegen_ssa/Cargo.toml +index faabea92f5a6c..81c8b9ceb136e 100644 +--- a/compiler/rustc_codegen_ssa/Cargo.toml ++++ b/compiler/rustc_codegen_ssa/Cargo.toml +@@ -40,6 +40,7 @@ rustc_metadata = { path = "../rustc_metadata" } + rustc_query_system = { path = "../rustc_query_system" } + rustc_target = { path = "../rustc_target" } + rustc_session = { path = "../rustc_session" } ++rustc_const_eval = { path = "../rustc_const_eval" } + + [dependencies.object] + version = "0.29.0" +diff --git a/compiler/rustc_codegen_ssa/src/mir/block.rs b/compiler/rustc_codegen_ssa/src/mir/block.rs +index 745da821c9d76..773c55cf551d5 100644 +--- a/compiler/rustc_codegen_ssa/src/mir/block.rs ++++ b/compiler/rustc_codegen_ssa/src/mir/block.rs +@@ -22,7 +22,7 @@ use rustc_span::source_map::Span; + use rustc_span::{sym, Symbol}; + use rustc_symbol_mangling::typeid_for_fnabi; + use rustc_target::abi::call::{ArgAbi, FnAbi, PassMode}; +-use rustc_target::abi::{self, HasDataLayout, InitKind, WrappingRange}; ++use rustc_target::abi::{self, HasDataLayout, WrappingRange}; + use rustc_target::spec::abi::Abi; + + /// Used by `FunctionCx::codegen_terminator` for emitting common patterns +@@ -528,7 +528,6 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> { + source_info: mir::SourceInfo, + target: Option<mir::BasicBlock>, + cleanup: Option<mir::BasicBlock>, +- strict_validity: bool, + ) -> bool { + // Emit a panic or a no-op for `assert_*` intrinsics. + // These are intrinsics that compile to panics so that we can get a message +@@ -547,12 +546,13 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> { + }); + if let Some(intrinsic) = panic_intrinsic { + use AssertIntrinsic::*; ++ + let ty = instance.unwrap().substs.type_at(0); + let layout = bx.layout_of(ty); + let do_panic = match intrinsic { + Inhabited => layout.abi.is_uninhabited(), +- ZeroValid => !layout.might_permit_raw_init(bx, InitKind::Zero, strict_validity), +- UninitValid => !layout.might_permit_raw_init(bx, InitKind::Uninit, strict_validity), ++ ZeroValid => !bx.tcx().permits_zero_init(layout), ++ UninitValid => !bx.tcx().permits_uninit_init(layout), + }; + if do_panic { + let msg_str = with_no_visible_paths!({ +@@ -687,7 +687,6 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> { + source_info, + target, + cleanup, +- self.cx.tcx().sess.opts.unstable_opts.strict_init_checks, + ) { + return; + } +diff --git a/compiler/rustc_const_eval/src/const_eval/machine.rs b/compiler/rustc_const_eval/src/const_eval/machine.rs +index 29ab1d187719c..e00e667fb71e2 100644 +--- a/compiler/rustc_const_eval/src/const_eval/machine.rs ++++ b/compiler/rustc_const_eval/src/const_eval/machine.rs +@@ -104,7 +104,7 @@ pub struct CompileTimeInterpreter<'mir, 'tcx> { + } + + impl<'mir, 'tcx> CompileTimeInterpreter<'mir, 'tcx> { +- pub(super) fn new(const_eval_limit: Limit, can_access_statics: bool) -> Self { ++ pub(crate) fn new(const_eval_limit: Limit, can_access_statics: bool) -> Self { + CompileTimeInterpreter { + steps_remaining: const_eval_limit.0, + stack: Vec::new(), +diff --git a/compiler/rustc_const_eval/src/interpret/intrinsics.rs b/compiler/rustc_const_eval/src/interpret/intrinsics.rs +index e2a8a9891f72f..7827fb8395b7f 100644 +--- a/compiler/rustc_const_eval/src/interpret/intrinsics.rs ++++ b/compiler/rustc_const_eval/src/interpret/intrinsics.rs +@@ -15,7 +15,7 @@ use rustc_middle::ty::layout::LayoutOf as _; + use rustc_middle::ty::subst::SubstsRef; + use rustc_middle::ty::{Ty, TyCtxt}; + use rustc_span::symbol::{sym, Symbol}; +-use rustc_target::abi::{Abi, Align, InitKind, Primitive, Size}; ++use rustc_target::abi::{Abi, Align, Primitive, Size}; + + use super::{ + util::ensure_monomorphic_enough, CheckInAllocMsg, ImmTy, InterpCx, Machine, OpTy, PlaceTy, +@@ -413,35 +413,33 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> { + ), + )?; + } +- if intrinsic_name == sym::assert_zero_valid +- && !layout.might_permit_raw_init( +- self, +- InitKind::Zero, +- self.tcx.sess.opts.unstable_opts.strict_init_checks, +- ) +- { +- M::abort( +- self, +- format!( +- "aborted execution: attempted to zero-initialize type `{}`, which is invalid", +- ty +- ), +- )?; ++ ++ if intrinsic_name == sym::assert_zero_valid { ++ let should_panic = !self.tcx.permits_zero_init(layout); ++ ++ if should_panic { ++ M::abort( ++ self, ++ format!( ++ "aborted execution: attempted to zero-initialize type `{}`, which is invalid", ++ ty ++ ), ++ )?; ++ } + } +- if intrinsic_name == sym::assert_uninit_valid +- && !layout.might_permit_raw_init( +- self, +- InitKind::Uninit, +- self.tcx.sess.opts.unstable_opts.strict_init_checks, +- ) +- { +- M::abort( +- self, +- format!( +- "aborted execution: attempted to leave type `{}` uninitialized, which is invalid", +- ty +- ), +- )?; ++ ++ if intrinsic_name == sym::assert_uninit_valid { ++ let should_panic = !self.tcx.permits_uninit_init(layout); ++ ++ if should_panic { ++ M::abort( ++ self, ++ format!( ++ "aborted execution: attempted to leave type `{}` uninitialized, which is invalid", ++ ty ++ ), ++ )?; ++ } + } + } + sym::simd_insert => { +diff --git a/compiler/rustc_const_eval/src/lib.rs b/compiler/rustc_const_eval/src/lib.rs +index d65d4f7eb720e..72ac6af685dc4 100644 +--- a/compiler/rustc_const_eval/src/lib.rs ++++ b/compiler/rustc_const_eval/src/lib.rs +@@ -33,11 +33,13 @@ extern crate rustc_middle; + pub mod const_eval; + mod errors; + pub mod interpret; ++mod might_permit_raw_init; + pub mod transform; + pub mod util; + + use rustc_middle::ty; + use rustc_middle::ty::query::Providers; ++use rustc_target::abi::InitKind; + + pub fn provide(providers: &mut Providers) { + const_eval::provide(providers); +@@ -59,4 +61,8 @@ pub fn provide(providers: &mut Providers) { + let (param_env, value) = param_env_and_value.into_parts(); + const_eval::deref_mir_constant(tcx, param_env, value) + }; ++ providers.permits_uninit_init = ++ |tcx, ty| might_permit_raw_init::might_permit_raw_init(tcx, ty, InitKind::Uninit); ++ providers.permits_zero_init = ++ |tcx, ty| might_permit_raw_init::might_permit_raw_init(tcx, ty, InitKind::Zero); + } +diff --git a/compiler/rustc_const_eval/src/might_permit_raw_init.rs b/compiler/rustc_const_eval/src/might_permit_raw_init.rs +new file mode 100644 +index 0000000000000..f971c2238c7bb +--- /dev/null ++++ b/compiler/rustc_const_eval/src/might_permit_raw_init.rs +@@ -0,0 +1,40 @@ ++use crate::const_eval::CompileTimeInterpreter; ++use crate::interpret::{InterpCx, MemoryKind, OpTy}; ++use rustc_middle::ty::layout::LayoutCx; ++use rustc_middle::ty::{layout::TyAndLayout, ParamEnv, TyCtxt}; ++use rustc_session::Limit; ++use rustc_target::abi::InitKind; ++ ++pub fn might_permit_raw_init<'tcx>( ++ tcx: TyCtxt<'tcx>, ++ ty: TyAndLayout<'tcx>, ++ kind: InitKind, ++) -> bool { ++ let strict = tcx.sess.opts.unstable_opts.strict_init_checks; ++ ++ if strict { ++ let machine = CompileTimeInterpreter::new(Limit::new(0), false); ++ ++ let mut cx = InterpCx::new(tcx, rustc_span::DUMMY_SP, ParamEnv::reveal_all(), machine); ++ ++ let allocated = cx ++ .allocate(ty, MemoryKind::Machine(crate::const_eval::MemoryKind::Heap)) ++ .expect("OOM: failed to allocate for uninit check"); ++ ++ if kind == InitKind::Zero { ++ cx.write_bytes_ptr( ++ allocated.ptr, ++ std::iter::repeat(0_u8).take(ty.layout.size().bytes_usize()), ++ ) ++ .expect("failed to write bytes for zero valid check"); ++ } ++ ++ let ot: OpTy<'_, _> = allocated.into(); ++ ++ // Assume that if it failed, it's a validation failure. ++ cx.validate_operand(&ot).is_ok() ++ } else { ++ let layout_cx = LayoutCx { tcx, param_env: ParamEnv::reveal_all() }; ++ ty.might_permit_raw_init(&layout_cx, kind) ++ } ++} +diff --git a/compiler/rustc_middle/src/query/mod.rs b/compiler/rustc_middle/src/query/mod.rs +index bdae7e5fcd6b1..0581ef41f66c2 100644 +--- a/compiler/rustc_middle/src/query/mod.rs ++++ b/compiler/rustc_middle/src/query/mod.rs +@@ -2053,4 +2053,12 @@ rustc_queries! { + desc { |tcx| "looking up generator diagnostic data of `{}`", tcx.def_path_str(key) } + separate_provide_extern + } ++ ++ query permits_uninit_init(key: TyAndLayout<'tcx>) -> bool { ++ desc { "checking to see if {:?} permits being left uninit", key.ty } ++ } ++ ++ query permits_zero_init(key: TyAndLayout<'tcx>) -> bool { ++ desc { "checking to see if {:?} permits being left zeroed", key.ty } ++ } + } +diff --git a/compiler/rustc_middle/src/ty/query.rs b/compiler/rustc_middle/src/ty/query.rs +index 3d662ed5de4ba..2452bcf6a61b8 100644 +--- a/compiler/rustc_middle/src/ty/query.rs ++++ b/compiler/rustc_middle/src/ty/query.rs +@@ -28,6 +28,7 @@ use crate::traits::query::{ + use crate::traits::specialization_graph; + use crate::traits::{self, ImplSource}; + use crate::ty::fast_reject::SimplifiedType; ++use crate::ty::layout::TyAndLayout; + use crate::ty::subst::{GenericArg, SubstsRef}; + use crate::ty::util::AlwaysRequiresDrop; + use crate::ty::GeneratorDiagnosticData; +diff --git a/compiler/rustc_query_impl/src/keys.rs b/compiler/rustc_query_impl/src/keys.rs +index 6fbafeb1d32b3..5477431431374 100644 +--- a/compiler/rustc_query_impl/src/keys.rs ++++ b/compiler/rustc_query_impl/src/keys.rs +@@ -6,7 +6,7 @@ use rustc_middle::mir; + use rustc_middle::traits; + use rustc_middle::ty::fast_reject::SimplifiedType; + use rustc_middle::ty::subst::{GenericArg, SubstsRef}; +-use rustc_middle::ty::{self, Ty, TyCtxt}; ++use rustc_middle::ty::{self, layout::TyAndLayout, Ty, TyCtxt}; + use rustc_span::symbol::{Ident, Symbol}; + use rustc_span::{Span, DUMMY_SP}; + +@@ -385,6 +385,16 @@ impl<'tcx> Key for Ty<'tcx> { + } + } + ++impl<'tcx> Key for TyAndLayout<'tcx> { ++ #[inline(always)] ++ fn query_crate_is_local(&self) -> bool { ++ true ++ } ++ fn default_span(&self, _: TyCtxt<'_>) -> Span { ++ DUMMY_SP ++ } ++} ++ + impl<'tcx> Key for (Ty<'tcx>, Ty<'tcx>) { + #[inline(always)] + fn query_crate_is_local(&self) -> bool { +diff --git a/compiler/rustc_target/src/abi/mod.rs b/compiler/rustc_target/src/abi/mod.rs +index d1eafd6ac5fb8..6f4d073d70486 100644 +--- a/compiler/rustc_target/src/abi/mod.rs ++++ b/compiler/rustc_target/src/abi/mod.rs +@@ -1372,7 +1372,7 @@ pub struct PointeeInfo { + + /// Used in `might_permit_raw_init` to indicate the kind of initialisation + /// that is checked to be valid +-#[derive(Copy, Clone, Debug)] ++#[derive(Copy, Clone, Debug, PartialEq, Eq)] + pub enum InitKind { + Zero, + Uninit, +@@ -1487,14 +1487,18 @@ impl<'a, Ty> TyAndLayout<'a, Ty> { + /// + /// `init_kind` indicates if the memory is zero-initialized or left uninitialized. + /// +- /// `strict` is an opt-in debugging flag added in #97323 that enables more checks. ++ /// This code is intentionally conservative, and will not detect ++ /// * zero init of an enum whose 0 variant does not allow zero initialization ++ /// * making uninitialized types who have a full valid range (ints, floats, raw pointers) ++ /// * Any form of invalid value being made inside an array (unless the value is uninhabited) + /// +- /// This is conservative: in doubt, it will answer `true`. ++ /// A strict form of these checks that uses const evaluation exists in ++ /// `rustc_const_eval::might_permit_raw_init`, and a tracking issue for making these checks ++ /// stricter is <https://github.com/rust-lang/rust/issues/66151>. + /// +- /// FIXME: Once we removed all the conservatism, we could alternatively +- /// create an all-0/all-undef constant and run the const value validator to see if +- /// this is a valid value for the given type. +- pub fn might_permit_raw_init<C>(self, cx: &C, init_kind: InitKind, strict: bool) -> bool ++ /// FIXME: Once all the conservatism is removed from here, and the checks are ran by default, ++ /// we can use the const evaluation checks always instead. ++ pub fn might_permit_raw_init<C>(self, cx: &C, init_kind: InitKind) -> bool + where + Self: Copy, + Ty: TyAbiInterface<'a, C>, +@@ -1507,13 +1511,8 @@ impl<'a, Ty> TyAndLayout<'a, Ty> { + s.valid_range(cx).contains(0) + } + InitKind::Uninit => { +- if strict { +- // The type must be allowed to be uninit (which means "is a union"). +- s.is_uninit_valid() +- } else { +- // The range must include all values. +- s.is_always_valid(cx) +- } ++ // The range must include all values. ++ s.is_always_valid(cx) + } + } + }; +@@ -1534,19 +1533,12 @@ impl<'a, Ty> TyAndLayout<'a, Ty> { + // If we have not found an error yet, we need to recursively descend into fields. + match &self.fields { + FieldsShape::Primitive | FieldsShape::Union { .. } => {} +- FieldsShape::Array { count, .. } => { ++ FieldsShape::Array { .. } => { + // FIXME(#66151): For now, we are conservative and do not check arrays by default. +- if strict +- && *count > 0 +- && !self.field(cx, 0).might_permit_raw_init(cx, init_kind, strict) +- { +- // Found non empty array with a type that is unhappy about this kind of initialization +- return false; +- } + } + FieldsShape::Arbitrary { offsets, .. } => { + for idx in 0..offsets.len() { +- if !self.field(cx, idx).might_permit_raw_init(cx, init_kind, strict) { ++ if !self.field(cx, idx).might_permit_raw_init(cx, init_kind) { + // We found a field that is unhappy with this kind of initialization. + return false; + } +diff --git a/src/test/ui/intrinsics/panic-uninitialized-zeroed.rs b/src/test/ui/intrinsics/panic-uninitialized-zeroed.rs +index 3ffd35ecdb8da..255151a96032c 100644 +--- a/src/test/ui/intrinsics/panic-uninitialized-zeroed.rs ++++ b/src/test/ui/intrinsics/panic-uninitialized-zeroed.rs +@@ -57,6 +57,13 @@ enum LR_NonZero { + + struct ZeroSized; + ++#[allow(dead_code)] ++#[repr(i32)] ++enum ZeroIsValid { ++ Zero(u8) = 0, ++ One(NonNull<()>) = 1, ++} ++ + fn test_panic_msg<T>(op: impl (FnOnce() -> T) + panic::UnwindSafe, msg: &str) { + let err = panic::catch_unwind(op).err(); + assert_eq!( +@@ -152,33 +159,12 @@ fn main() { + "attempted to zero-initialize type `*const dyn core::marker::Send`, which is invalid" + ); + +- /* FIXME(#66151) we conservatively do not error here yet. +- test_panic_msg( +- || mem::uninitialized::<LR_NonZero>(), +- "attempted to leave type `LR_NonZero` uninitialized, which is invalid" +- ); +- test_panic_msg( +- || mem::zeroed::<LR_NonZero>(), +- "attempted to zero-initialize type `LR_NonZero`, which is invalid" +- ); +- +- test_panic_msg( +- || mem::uninitialized::<ManuallyDrop<LR_NonZero>>(), +- "attempted to leave type `std::mem::ManuallyDrop<LR_NonZero>` uninitialized, \ +- which is invalid" +- ); +- test_panic_msg( +- || mem::zeroed::<ManuallyDrop<LR_NonZero>>(), +- "attempted to zero-initialize type `std::mem::ManuallyDrop<LR_NonZero>`, \ +- which is invalid" +- ); +- */ +- + test_panic_msg( + || mem::uninitialized::<(NonNull<u32>, u32, u32)>(), + "attempted to leave type `(core::ptr::non_null::NonNull<u32>, u32, u32)` uninitialized, \ + which is invalid" + ); ++ + test_panic_msg( + || mem::zeroed::<(NonNull<u32>, u32, u32)>(), + "attempted to zero-initialize type `(core::ptr::non_null::NonNull<u32>, u32, u32)`, \ +@@ -196,11 +182,23 @@ fn main() { + which is invalid" + ); + ++ test_panic_msg( ++ || mem::uninitialized::<LR_NonZero>(), ++ "attempted to leave type `LR_NonZero` uninitialized, which is invalid" ++ ); ++ ++ test_panic_msg( ++ || mem::uninitialized::<ManuallyDrop<LR_NonZero>>(), ++ "attempted to leave type `core::mem::manually_drop::ManuallyDrop<LR_NonZero>` uninitialized, \ ++ which is invalid" ++ ); ++ + test_panic_msg( + || mem::uninitialized::<NoNullVariant>(), + "attempted to leave type `NoNullVariant` uninitialized, \ + which is invalid" + ); ++ + test_panic_msg( + || mem::zeroed::<NoNullVariant>(), + "attempted to zero-initialize type `NoNullVariant`, \ +@@ -212,10 +210,12 @@ fn main() { + || mem::uninitialized::<bool>(), + "attempted to leave type `bool` uninitialized, which is invalid" + ); ++ + test_panic_msg( + || mem::uninitialized::<LR>(), + "attempted to leave type `LR` uninitialized, which is invalid" + ); ++ + test_panic_msg( + || mem::uninitialized::<ManuallyDrop<LR>>(), + "attempted to leave type `core::mem::manually_drop::ManuallyDrop<LR>` uninitialized, which is invalid" +@@ -229,6 +229,7 @@ fn main() { + let _val = mem::zeroed::<Option<&'static i32>>(); + let _val = mem::zeroed::<MaybeUninit<NonNull<u32>>>(); + let _val = mem::zeroed::<[!; 0]>(); ++ let _val = mem::zeroed::<ZeroIsValid>(); + let _val = mem::uninitialized::<MaybeUninit<bool>>(); + let _val = mem::uninitialized::<[!; 0]>(); + let _val = mem::uninitialized::<()>(); +@@ -259,12 +260,33 @@ fn main() { + || mem::zeroed::<[NonNull<()>; 1]>(), + "attempted to zero-initialize type `[core::ptr::non_null::NonNull<()>; 1]`, which is invalid" + ); ++ ++ // FIXME(#66151) we conservatively do not error here yet (by default). ++ test_panic_msg( ++ || mem::zeroed::<LR_NonZero>(), ++ "attempted to zero-initialize type `LR_NonZero`, which is invalid" ++ ); ++ ++ test_panic_msg( ++ || mem::zeroed::<ManuallyDrop<LR_NonZero>>(), ++ "attempted to zero-initialize type `core::mem::manually_drop::ManuallyDrop<LR_NonZero>`, \ ++ which is invalid" ++ ); + } else { + // These are UB because they have not been officially blessed, but we await the resolution + // of <https://github.com/rust-lang/unsafe-code-guidelines/issues/71> before doing + // anything about that. + let _val = mem::uninitialized::<i32>(); + let _val = mem::uninitialized::<*const ()>(); ++ ++ // These are UB, but best to test them to ensure we don't become unintentionally ++ // stricter. ++ ++ // It's currently unchecked to create invalid enums and values inside arrays. ++ let _val = mem::zeroed::<LR_NonZero>(); ++ let _val = mem::zeroed::<[LR_NonZero; 1]>(); ++ let _val = mem::zeroed::<[NonNull<()>; 1]>(); ++ let _val = mem::uninitialized::<[NonNull<()>; 1]>(); + } + } + } |