diff --git a/RELEASES.md b/RELEASES.md index e0175db7ec881..1dd3fbea6136f 100644 --- a/RELEASES.md +++ b/RELEASES.md @@ -16,8 +16,7 @@ Version 1.84.1 (2025-01-30) Version 1.84.0 (2025-01-09) ========================== - + Language -------- diff --git a/compiler/rustc_const_eval/src/interpret/intrinsics.rs b/compiler/rustc_const_eval/src/interpret/intrinsics.rs index 0664a882c1d50..9f5f2533e085b 100644 --- a/compiler/rustc_const_eval/src/interpret/intrinsics.rs +++ b/compiler/rustc_const_eval/src/interpret/intrinsics.rs @@ -747,7 +747,13 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> { { let a: F = self.read_scalar(&args[0])?.to_float()?; let b: F = self.read_scalar(&args[1])?.to_float()?; - let res = self.adjust_nan(a.min(b), &[a, b]); + let res = if a == b { + // They are definitely not NaN (those are never equal), but they could be `+0` and `-0`. + // Let the machine decide which one to return. + M::equal_float_min_max(self, a, b) + } else { + self.adjust_nan(a.min(b), &[a, b]) + }; self.write_scalar(res, dest)?; interp_ok(()) } @@ -762,7 +768,13 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> { { let a: F = self.read_scalar(&args[0])?.to_float()?; let b: F = self.read_scalar(&args[1])?.to_float()?; - let res = self.adjust_nan(a.max(b), &[a, b]); + let res = if a == b { + // They are definitely not NaN (those are never equal), but they could be `+0` and `-0`. + // Let the machine decide which one to return. + M::equal_float_min_max(self, a, b) + } else { + self.adjust_nan(a.max(b), &[a, b]) + }; self.write_scalar(res, dest)?; interp_ok(()) } diff --git a/compiler/rustc_const_eval/src/interpret/machine.rs b/compiler/rustc_const_eval/src/interpret/machine.rs index 36e5a2ff750ae..8f6b15b8df012 100644 --- a/compiler/rustc_const_eval/src/interpret/machine.rs +++ b/compiler/rustc_const_eval/src/interpret/machine.rs @@ -278,6 +278,12 @@ pub trait Machine<'tcx>: Sized { F2::NAN } + /// Determines the result of `min`/`max` on floats when the arguments are equal. + fn equal_float_min_max(_ecx: &InterpCx<'tcx, Self>, a: F, _b: F) -> F { + // By default, we pick the left argument. + a + } + /// Called before a basic block terminator is executed. #[inline] fn before_terminator(_ecx: &mut InterpCx<'tcx, Self>) -> InterpResult<'tcx> { diff --git a/compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs b/compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs index e84ae65f90322..9277d71234f42 100644 --- a/compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs +++ b/compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs @@ -253,6 +253,8 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> { return; } + let mut expr_ty = self.typeck_results.borrow().expr_ty_adjusted(expr); + for a in &adj { match a.kind { Adjust::NeverToAny => { @@ -266,7 +268,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> { None, expr.span, overloaded_deref.method_call(self.tcx), - self.tcx.mk_args(&[a.target.into()]), + self.tcx.mk_args(&[expr_ty.into()]), ); } Adjust::Deref(None) => { @@ -283,6 +285,8 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> { // No effects to enforce here. } } + + expr_ty = a.target; } let autoborrow_mut = adj.iter().any(|adj| { diff --git a/compiler/rustc_mir_transform/src/inline.rs b/compiler/rustc_mir_transform/src/inline.rs index 95aeccfdda66b..f8b0688dfdcc0 100644 --- a/compiler/rustc_mir_transform/src/inline.rs +++ b/compiler/rustc_mir_transform/src/inline.rs @@ -4,7 +4,7 @@ use std::iter; use std::ops::{Range, RangeFrom}; use rustc_abi::{ExternAbi, FieldIdx}; -use rustc_attr_parsing::InlineAttr; +use rustc_attr_parsing::{InlineAttr, OptimizeAttr}; use rustc_hir::def::DefKind; use rustc_hir::def_id::DefId; use rustc_index::Idx; @@ -770,6 +770,10 @@ fn check_codegen_attributes<'tcx, I: Inliner<'tcx>>( return Err("never inline attribute"); } + if let OptimizeAttr::DoNotOptimize = callee_attrs.optimize { + return Err("has DoNotOptimize attribute"); + } + // Reachability pass defines which functions are eligible for inlining. Generally inlining // other functions is incorrect because they could reference symbols that aren't exported. let is_generic = callsite.callee.args.non_erasable_generics().next().is_some(); diff --git a/compiler/rustc_passes/src/liveness.rs b/compiler/rustc_passes/src/liveness.rs index 73da8855e10c2..60f7616a5fbad 100644 --- a/compiler/rustc_passes/src/liveness.rs +++ b/compiler/rustc_passes/src/liveness.rs @@ -1522,6 +1522,14 @@ impl<'tcx> Liveness<'_, 'tcx> { } fn warn_about_unused_args(&self, body: &hir::Body<'_>, entry_ln: LiveNode) { + if let Some(intrinsic) = + self.ir.tcx.intrinsic(self.ir.tcx.hir().body_owner_def_id(body.id())) + { + if intrinsic.must_be_overridden { + return; + } + } + for p in body.params { self.check_unused_vars_in_pat( p.pat, diff --git a/compiler/rustc_target/src/spec/json.rs b/compiler/rustc_target/src/spec/json.rs index 015ea97f2acb0..a6b0ec072e8c0 100644 --- a/compiler/rustc_target/src/spec/json.rs +++ b/compiler/rustc_target/src/spec/json.rs @@ -128,6 +128,19 @@ impl Target { Some(Ok(())) })).unwrap_or(Ok(())) } ); + ($key_name:ident, RustcAbi) => ( { + let name = (stringify!($key_name)).replace("_", "-"); + obj.remove(&name).and_then(|o| o.as_str().and_then(|s| { + match s.parse::() { + Ok(rustc_abi) => base.$key_name = Some(rustc_abi), + _ => return Some(Err(format!( + "'{s}' is not a valid value for rustc-abi. \ + Use 'x86-softfloat' or leave the field unset." + ))), + } + Some(Ok(())) + })).unwrap_or(Ok(())) + } ); ($key_name:ident, RelocModel) => ( { let name = (stringify!($key_name)).replace("_", "-"); obj.remove(&name).and_then(|o| o.as_str().and_then(|s| { @@ -612,6 +625,7 @@ impl Target { key!(llvm_mcount_intrinsic, optional); key!(llvm_abiname); key!(llvm_floatabi, FloatAbi)?; + key!(rustc_abi, RustcAbi)?; key!(relax_elf_relocations, bool); key!(llvm_args, list); key!(use_ctors_section, bool); @@ -788,6 +802,7 @@ impl ToJson for Target { target_option_val!(llvm_mcount_intrinsic); target_option_val!(llvm_abiname); target_option_val!(llvm_floatabi); + target_option_val!(rustc_abi); target_option_val!(relax_elf_relocations); target_option_val!(llvm_args); target_option_val!(use_ctors_section); diff --git a/compiler/rustc_target/src/spec/mod.rs b/compiler/rustc_target/src/spec/mod.rs index 3fc7a07fb9139..72600225e7a38 100644 --- a/compiler/rustc_target/src/spec/mod.rs +++ b/compiler/rustc_target/src/spec/mod.rs @@ -1114,6 +1114,33 @@ impl ToJson for FloatAbi { } } +/// The Rustc-specific variant of the ABI used for this target. +#[derive(Clone, Copy, PartialEq, Hash, Debug)] +pub enum RustcAbi { + /// On x86-32/64 only: do not use any FPU or SIMD registers for the ABI. + X86Softfloat, +} + +impl FromStr for RustcAbi { + type Err = (); + + fn from_str(s: &str) -> Result { + Ok(match s { + "x86-softfloat" => RustcAbi::X86Softfloat, + _ => return Err(()), + }) + } +} + +impl ToJson for RustcAbi { + fn to_json(&self) -> Json { + match *self { + RustcAbi::X86Softfloat => "x86-softfloat", + } + .to_json() + } +} + #[derive(Clone, Copy, PartialEq, Hash, Debug)] pub enum TlsModel { GeneralDynamic, @@ -2505,6 +2532,12 @@ pub struct TargetOptions { /// If not provided, LLVM will infer the float ABI from the target triple (`llvm_target`). pub llvm_floatabi: Option, + /// Picks a specific ABI for this target. This is *not* just for "Rust" ABI functions, + /// it can also affect "C" ABI functions; the point is that this flag is interpreted by + /// rustc and not forwarded to LLVM. + /// So far, this is only used on x86. + pub rustc_abi: Option, + /// Whether or not RelaxElfRelocation flag will be passed to the linker pub relax_elf_relocations: bool, @@ -2664,10 +2697,6 @@ impl TargetOptions { .collect(); } } - - pub(crate) fn has_feature(&self, search_feature: &str) -> bool { - self.features.split(',').any(|f| f.strip_prefix('+').is_some_and(|f| f == search_feature)) - } } impl Default for TargetOptions { @@ -2774,6 +2803,7 @@ impl Default for TargetOptions { llvm_mcount_intrinsic: None, llvm_abiname: "".into(), llvm_floatabi: None, + rustc_abi: None, relax_elf_relocations: false, llvm_args: cvs![], use_ctors_section: false, @@ -3240,6 +3270,17 @@ impl Target { _ => {} } + // Check consistency of Rust ABI declaration. + if let Some(rust_abi) = self.rustc_abi { + match rust_abi { + RustcAbi::X86Softfloat => check_matches!( + &*self.arch, + "x86" | "x86_64", + "`x86-softfloat` ABI is only valid for x86 targets" + ), + } + } + // Check that the given target-features string makes some basic sense. if !self.features.is_empty() { let mut features_enabled = FxHashSet::default(); diff --git a/compiler/rustc_target/src/spec/targets/i686_unknown_uefi.rs b/compiler/rustc_target/src/spec/targets/i686_unknown_uefi.rs index 39d3a5a46330f..c1ed565f0fe68 100644 --- a/compiler/rustc_target/src/spec/targets/i686_unknown_uefi.rs +++ b/compiler/rustc_target/src/spec/targets/i686_unknown_uefi.rs @@ -5,7 +5,7 @@ // The cdecl ABI is used. It differs from the stdcall or fastcall ABI. // "i686-unknown-windows" is used to get the minimal subset of windows-specific features. -use crate::spec::{Target, base}; +use crate::spec::{RustcAbi, Target, base}; pub(crate) fn target() -> Target { let mut base = base::uefi_msvc::opts(); @@ -22,6 +22,7 @@ pub(crate) fn target() -> Target { // If you initialize FP units yourself, you can override these flags with custom linker // arguments, thus giving you access to full MMX/SSE acceleration. base.features = "-mmx,-sse,+soft-float".into(); + base.rustc_abi = Some(RustcAbi::X86Softfloat); // Use -GNU here, because of the reason below: // Background and Problem: diff --git a/compiler/rustc_target/src/spec/targets/powerpc_unknown_linux_gnu.rs b/compiler/rustc_target/src/spec/targets/powerpc_unknown_linux_gnu.rs index 1ae879d01bd46..1c537491a6cad 100644 --- a/compiler/rustc_target/src/spec/targets/powerpc_unknown_linux_gnu.rs +++ b/compiler/rustc_target/src/spec/targets/powerpc_unknown_linux_gnu.rs @@ -18,6 +18,11 @@ pub(crate) fn target() -> Target { pointer_width: 32, data_layout: "E-m:e-p:32:32-Fn32-i64:64-n32".into(), arch: "powerpc".into(), - options: TargetOptions { endian: Endian::Big, mcount: "_mcount".into(), ..base }, + options: TargetOptions { + endian: Endian::Big, + features: "+secure-plt".into(), + mcount: "_mcount".into(), + ..base + }, } } diff --git a/compiler/rustc_target/src/spec/targets/powerpc_unknown_linux_gnuspe.rs b/compiler/rustc_target/src/spec/targets/powerpc_unknown_linux_gnuspe.rs index 4a5ab375c7307..4f5d9c661b08d 100644 --- a/compiler/rustc_target/src/spec/targets/powerpc_unknown_linux_gnuspe.rs +++ b/compiler/rustc_target/src/spec/targets/powerpc_unknown_linux_gnuspe.rs @@ -21,6 +21,7 @@ pub(crate) fn target() -> Target { options: TargetOptions { abi: "spe".into(), endian: Endian::Big, + features: "+secure-plt".into(), mcount: "_mcount".into(), ..base }, diff --git a/compiler/rustc_target/src/spec/targets/x86_64_unknown_none.rs b/compiler/rustc_target/src/spec/targets/x86_64_unknown_none.rs index cfefb1de99387..e14a367358944 100644 --- a/compiler/rustc_target/src/spec/targets/x86_64_unknown_none.rs +++ b/compiler/rustc_target/src/spec/targets/x86_64_unknown_none.rs @@ -5,8 +5,8 @@ // features. use crate::spec::{ - Cc, CodeModel, LinkerFlavor, Lld, PanicStrategy, RelroLevel, SanitizerSet, StackProbeType, - Target, TargetOptions, + Cc, CodeModel, LinkerFlavor, Lld, PanicStrategy, RelroLevel, RustcAbi, SanitizerSet, + StackProbeType, Target, TargetOptions, }; pub(crate) fn target() -> Target { @@ -20,6 +20,7 @@ pub(crate) fn target() -> Target { relro_level: RelroLevel::Full, linker_flavor: LinkerFlavor::Gnu(Cc::No, Lld::Yes), linker: Some("rust-lld".into()), + rustc_abi: Some(RustcAbi::X86Softfloat), features: "-mmx,-sse,-sse2,-sse3,-ssse3,-sse4.1,-sse4.2,-avx,-avx2,+soft-float".into(), supported_sanitizers: SanitizerSet::KCFI | SanitizerSet::KERNELADDRESS, disable_redzone: true, diff --git a/compiler/rustc_target/src/spec/targets/x86_64_unknown_uefi.rs b/compiler/rustc_target/src/spec/targets/x86_64_unknown_uefi.rs index a11a79ff41a8e..8fd92e8123b99 100644 --- a/compiler/rustc_target/src/spec/targets/x86_64_unknown_uefi.rs +++ b/compiler/rustc_target/src/spec/targets/x86_64_unknown_uefi.rs @@ -6,7 +6,7 @@ // LLVM. "x86_64-unknown-windows" is used to get the minimal subset of windows-specific features. use crate::abi::call::Conv; -use crate::spec::{Target, base}; +use crate::spec::{RustcAbi, Target, base}; pub(crate) fn target() -> Target { let mut base = base::uefi_msvc::opts(); @@ -26,6 +26,7 @@ pub(crate) fn target() -> Target { // If you initialize FP units yourself, you can override these flags with custom linker // arguments, thus giving you access to full MMX/SSE acceleration. base.features = "-mmx,-sse,+soft-float".into(); + base.rustc_abi = Some(RustcAbi::X86Softfloat); Target { llvm_target: "x86_64-unknown-windows".into(), diff --git a/compiler/rustc_target/src/target_features.rs b/compiler/rustc_target/src/target_features.rs index 0d8a4988dce0e..5355a4ad53236 100644 --- a/compiler/rustc_target/src/target_features.rs +++ b/compiler/rustc_target/src/target_features.rs @@ -5,7 +5,7 @@ use rustc_data_structures::fx::{FxHashMap, FxHashSet}; use rustc_data_structures::stable_hasher::{HashStable, StableHasher}; use rustc_span::{Symbol, sym}; -use crate::spec::{FloatAbi, Target}; +use crate::spec::{FloatAbi, RustcAbi, Target}; /// Features that control behaviour of rustc, rather than the codegen. /// These exist globally and are not in the target-specific lists below. @@ -422,7 +422,9 @@ const X86_FEATURES: &[(&str, Stability, ImpliedFeatures)] = &[ ("sha512", Unstable(sym::sha512_sm_x86), &["avx2"]), ("sm3", Unstable(sym::sha512_sm_x86), &["avx"]), ("sm4", Unstable(sym::sha512_sm_x86), &["avx2"]), - ("soft-float", Stability::Forbidden { reason: "unsound because it changes float ABI" }, &[]), + // This cannot actually be toggled, the ABI always fixes it, so it'd make little sense to + // stabilize. It must be in this list for the ABI check to be able to use it. + ("soft-float", Stability::Unstable(sym::x87_target_feature), &[]), ("sse", Stable, &[]), ("sse2", Stable, &["sse"]), ("sse3", Stable, &["sse2"]), @@ -773,23 +775,41 @@ impl Target { // questions "which ABI is used". match &*self.arch { "x86" => { - // We support 2 ABIs, hardfloat (default) and softfloat. - // x86 has no sane ABI indicator so we have to use the target feature. - if self.has_feature("soft-float") { - NOTHING - } else { - // Hardfloat ABI. x87 must be enabled. - FeatureConstraints { required: &["x87"], incompatible: &[] } + // We use our own ABI indicator here; LLVM does not have anything native. + // Every case should require or forbid `soft-float`! + match self.rustc_abi { + None => { + // Default hardfloat ABI. + // x87 must be enabled, soft-float must be disabled. + FeatureConstraints { required: &["x87"], incompatible: &["soft-float"] } + } + Some(RustcAbi::X86Softfloat) => { + // Softfloat ABI, requires corresponding target feature. That feature trumps + // `x87` and all other FPU features so those do not matter. + // Note that this one requirement is the entire implementation of the ABI! + // LLVM handles the rest. + FeatureConstraints { required: &["soft-float"], incompatible: &[] } + } } } "x86_64" => { - // We support 2 ABIs, hardfloat (default) and softfloat. - // x86 has no sane ABI indicator so we have to use the target feature. - if self.has_feature("soft-float") { - NOTHING - } else { - // Hardfloat ABI. x87 and SSE2 must be enabled. - FeatureConstraints { required: &["x87", "sse2"], incompatible: &[] } + // We use our own ABI indicator here; LLVM does not have anything native. + // Every case should require or forbid `soft-float`! + match self.rustc_abi { + None => { + // Default hardfloat ABI. On x86-64, this always includes SSE2. + FeatureConstraints { + required: &["x87", "sse2"], + incompatible: &["soft-float"], + } + } + Some(RustcAbi::X86Softfloat) => { + // Softfloat ABI, requires corresponding target feature. That feature trumps + // `x87` and all other FPU features so those do not matter. + // Note that this one requirement is the entire implementation of the ABI! + // LLVM handles the rest. + FeatureConstraints { required: &["soft-float"], incompatible: &[] } + } } } "arm" => { diff --git a/compiler/rustc_trait_selection/src/solve/delegate.rs b/compiler/rustc_trait_selection/src/solve/delegate.rs index acd00d9f74f56..abb794934324e 100644 --- a/compiler/rustc_trait_selection/src/solve/delegate.rs +++ b/compiler/rustc_trait_selection/src/solve/delegate.rs @@ -1,7 +1,7 @@ use std::ops::Deref; use rustc_data_structures::fx::FxHashSet; -use rustc_hir::def_id::DefId; +use rustc_hir::def_id::{CRATE_DEF_ID, DefId}; use rustc_infer::infer::canonical::query_response::make_query_region_constraints; use rustc_infer::infer::canonical::{ Canonical, CanonicalExt as _, CanonicalQueryInput, CanonicalVarInfo, CanonicalVarValues, @@ -98,9 +98,10 @@ impl<'tcx> rustc_next_trait_solver::delegate::SolverDelegate for SolverDelegate< param_env: ty::ParamEnv<'tcx>, arg: ty::GenericArg<'tcx>, ) -> Option>>> { - crate::traits::wf::unnormalized_obligations(&self.0, param_env, arg).map(|obligations| { - obligations.into_iter().map(|obligation| obligation.into()).collect() - }) + crate::traits::wf::unnormalized_obligations(&self.0, param_env, arg, DUMMY_SP, CRATE_DEF_ID) + .map(|obligations| { + obligations.into_iter().map(|obligation| obligation.into()).collect() + }) } fn clone_opaque_types_for_query_response(&self) -> Vec<(ty::OpaqueTypeKey<'tcx>, Ty<'tcx>)> { diff --git a/compiler/rustc_trait_selection/src/solve/fulfill.rs b/compiler/rustc_trait_selection/src/solve/fulfill.rs index c8ae977b5ad60..0db44eda8470e 100644 --- a/compiler/rustc_trait_selection/src/solve/fulfill.rs +++ b/compiler/rustc_trait_selection/src/solve/fulfill.rs @@ -1,25 +1,21 @@ use std::marker::PhantomData; use std::mem; -use std::ops::ControlFlow; use rustc_data_structures::thinvec::ExtractIf; use rustc_infer::infer::InferCtxt; use rustc_infer::traits::query::NoSolution; -use rustc_infer::traits::solve::{CandidateSource, GoalSource, MaybeCause}; use rustc_infer::traits::{ - self, FromSolverError, MismatchedProjectionTypes, Obligation, ObligationCause, - ObligationCauseCode, PredicateObligation, PredicateObligations, SelectionError, TraitEngine, + FromSolverError, PredicateObligation, PredicateObligations, TraitEngine, }; -use rustc_middle::ty::error::{ExpectedFound, TypeError}; -use rustc_middle::ty::{self, TyCtxt}; -use rustc_middle::{bug, span_bug}; use rustc_next_trait_solver::solve::{GenerateProofTree, HasChanged, SolverDelegateEvalExt as _}; -use tracing::{instrument, trace}; +use tracing::instrument; +use self::derive_errors::*; use super::Certainty; use super::delegate::SolverDelegate; -use super::inspect::{self, ProofTreeInferCtxtExt, ProofTreeVisitor}; -use crate::traits::{FulfillmentError, FulfillmentErrorCode, ScrubbedTraitError}; +use crate::traits::{FulfillmentError, ScrubbedTraitError}; + +mod derive_errors; /// A trait engine using the new trait solver. /// @@ -244,483 +240,3 @@ impl<'tcx> FromSolverError<'tcx, NextSolverError<'tcx>> for ScrubbedTraitError<' } } } - -fn fulfillment_error_for_no_solution<'tcx>( - infcx: &InferCtxt<'tcx>, - root_obligation: PredicateObligation<'tcx>, -) -> FulfillmentError<'tcx> { - let obligation = find_best_leaf_obligation(infcx, &root_obligation, false); - - let code = match obligation.predicate.kind().skip_binder() { - ty::PredicateKind::Clause(ty::ClauseKind::Projection(_)) => { - FulfillmentErrorCode::Project( - // FIXME: This could be a `Sorts` if the term is a type - MismatchedProjectionTypes { err: TypeError::Mismatch }, - ) - } - ty::PredicateKind::Clause(ty::ClauseKind::ConstArgHasType(ct, expected_ty)) => { - let ct_ty = match ct.kind() { - ty::ConstKind::Unevaluated(uv) => { - infcx.tcx.type_of(uv.def).instantiate(infcx.tcx, uv.args) - } - ty::ConstKind::Param(param_ct) => param_ct.find_ty_from_env(obligation.param_env), - ty::ConstKind::Value(cv) => cv.ty, - kind => span_bug!( - obligation.cause.span, - "ConstArgHasWrongType failed but we don't know how to compute type for {kind:?}" - ), - }; - FulfillmentErrorCode::Select(SelectionError::ConstArgHasWrongType { - ct, - ct_ty, - expected_ty, - }) - } - ty::PredicateKind::NormalizesTo(..) => { - FulfillmentErrorCode::Project(MismatchedProjectionTypes { err: TypeError::Mismatch }) - } - ty::PredicateKind::AliasRelate(_, _, _) => { - FulfillmentErrorCode::Project(MismatchedProjectionTypes { err: TypeError::Mismatch }) - } - ty::PredicateKind::Subtype(pred) => { - let (a, b) = infcx.enter_forall_and_leak_universe( - obligation.predicate.kind().rebind((pred.a, pred.b)), - ); - let expected_found = ExpectedFound::new(a, b); - FulfillmentErrorCode::Subtype(expected_found, TypeError::Sorts(expected_found)) - } - ty::PredicateKind::Coerce(pred) => { - let (a, b) = infcx.enter_forall_and_leak_universe( - obligation.predicate.kind().rebind((pred.a, pred.b)), - ); - let expected_found = ExpectedFound::new(b, a); - FulfillmentErrorCode::Subtype(expected_found, TypeError::Sorts(expected_found)) - } - ty::PredicateKind::Clause(_) - | ty::PredicateKind::DynCompatible(_) - | ty::PredicateKind::Ambiguous => { - FulfillmentErrorCode::Select(SelectionError::Unimplemented) - } - ty::PredicateKind::ConstEquate(..) => { - bug!("unexpected goal: {obligation:?}") - } - }; - - FulfillmentError { obligation, code, root_obligation } -} - -fn fulfillment_error_for_stalled<'tcx>( - infcx: &InferCtxt<'tcx>, - root_obligation: PredicateObligation<'tcx>, -) -> FulfillmentError<'tcx> { - let (code, refine_obligation) = infcx.probe(|_| { - match <&SolverDelegate<'tcx>>::from(infcx) - .evaluate_root_goal(root_obligation.clone().into(), GenerateProofTree::No) - .0 - { - Ok((_, Certainty::Maybe(MaybeCause::Ambiguity))) => { - (FulfillmentErrorCode::Ambiguity { overflow: None }, true) - } - Ok((_, Certainty::Maybe(MaybeCause::Overflow { suggest_increasing_limit }))) => ( - FulfillmentErrorCode::Ambiguity { overflow: Some(suggest_increasing_limit) }, - // Don't look into overflows because we treat overflows weirdly anyways. - // We discard the inference constraints from overflowing goals, so - // recomputing the goal again during `find_best_leaf_obligation` may apply - // inference guidance that makes other goals go from ambig -> pass, for example. - // - // FIXME: We should probably just look into overflows here. - false, - ), - Ok((_, Certainty::Yes)) => { - bug!("did not expect successful goal when collecting ambiguity errors") - } - Err(_) => { - bug!("did not expect selection error when collecting ambiguity errors") - } - } - }); - - FulfillmentError { - obligation: if refine_obligation { - find_best_leaf_obligation(infcx, &root_obligation, true) - } else { - root_obligation.clone() - }, - code, - root_obligation, - } -} - -fn fulfillment_error_for_overflow<'tcx>( - infcx: &InferCtxt<'tcx>, - root_obligation: PredicateObligation<'tcx>, -) -> FulfillmentError<'tcx> { - FulfillmentError { - obligation: find_best_leaf_obligation(infcx, &root_obligation, true), - code: FulfillmentErrorCode::Ambiguity { overflow: Some(true) }, - root_obligation, - } -} - -fn find_best_leaf_obligation<'tcx>( - infcx: &InferCtxt<'tcx>, - obligation: &PredicateObligation<'tcx>, - consider_ambiguities: bool, -) -> PredicateObligation<'tcx> { - let obligation = infcx.resolve_vars_if_possible(obligation.clone()); - // FIXME: we use a probe here as the `BestObligation` visitor does not - // check whether it uses candidates which get shadowed by where-bounds. - // - // We should probably fix the visitor to not do so instead, as this also - // means the leaf obligation may be incorrect. - infcx - .fudge_inference_if_ok(|| { - infcx - .visit_proof_tree(obligation.clone().into(), &mut BestObligation { - obligation: obligation.clone(), - consider_ambiguities, - }) - .break_value() - .ok_or(()) - }) - .unwrap_or(obligation) -} - -struct BestObligation<'tcx> { - obligation: PredicateObligation<'tcx>, - consider_ambiguities: bool, -} - -impl<'tcx> BestObligation<'tcx> { - fn with_derived_obligation( - &mut self, - derived_obligation: PredicateObligation<'tcx>, - and_then: impl FnOnce(&mut Self) -> >::Result, - ) -> >::Result { - let old_obligation = std::mem::replace(&mut self.obligation, derived_obligation); - let res = and_then(self); - self.obligation = old_obligation; - res - } - - /// Filter out the candidates that aren't interesting to visit for the - /// purposes of reporting errors. For ambiguities, we only consider - /// candidates that may hold. For errors, we only consider candidates that - /// *don't* hold and which have impl-where clauses that also don't hold. - fn non_trivial_candidates<'a>( - &self, - goal: &'a inspect::InspectGoal<'a, 'tcx>, - ) -> Vec> { - let mut candidates = goal.candidates(); - match self.consider_ambiguities { - true => { - // If we have an ambiguous obligation, we must consider *all* candidates - // that hold, or else we may guide inference causing other goals to go - // from ambig -> pass/fail. - candidates.retain(|candidate| candidate.result().is_ok()); - } - false => { - // If we have >1 candidate, one may still be due to "boring" reasons, like - // an alias-relate that failed to hold when deeply evaluated. We really - // don't care about reasons like this. - if candidates.len() > 1 { - candidates.retain(|candidate| { - goal.infcx().probe(|_| { - candidate.instantiate_nested_goals(self.span()).iter().any( - |nested_goal| { - matches!( - nested_goal.source(), - GoalSource::ImplWhereBound - | GoalSource::AliasBoundConstCondition - | GoalSource::InstantiateHigherRanked - | GoalSource::AliasWellFormed - ) && match self.consider_ambiguities { - true => { - matches!( - nested_goal.result(), - Ok(Certainty::Maybe(MaybeCause::Ambiguity)) - ) - } - false => matches!(nested_goal.result(), Err(_)), - } - }, - ) - }) - }); - } - - // Prefer a non-rigid candidate if there is one. - if candidates.len() > 1 { - candidates.retain(|candidate| { - !matches!(candidate.kind(), inspect::ProbeKind::RigidAlias { .. }) - }); - } - } - } - - candidates - } -} - -impl<'tcx> ProofTreeVisitor<'tcx> for BestObligation<'tcx> { - type Result = ControlFlow>; - - fn span(&self) -> rustc_span::Span { - self.obligation.cause.span - } - - #[instrument(level = "trace", skip(self, goal), fields(goal = ?goal.goal()))] - fn visit_goal(&mut self, goal: &inspect::InspectGoal<'_, 'tcx>) -> Self::Result { - let candidates = self.non_trivial_candidates(goal); - trace!(candidates = ?candidates.iter().map(|c| c.kind()).collect::>()); - - let [candidate] = candidates.as_slice() else { - return ControlFlow::Break(self.obligation.clone()); - }; - - // Don't walk into impls that have `do_not_recommend`. - if let inspect::ProbeKind::TraitCandidate { - source: CandidateSource::Impl(impl_def_id), - result: _, - } = candidate.kind() - && goal.infcx().tcx.do_not_recommend_impl(impl_def_id) - { - return ControlFlow::Break(self.obligation.clone()); - } - - let tcx = goal.infcx().tcx; - // FIXME: Also, what about considering >1 layer up the stack? May be necessary - // for normalizes-to. - let pred_kind = goal.goal().predicate.kind(); - let child_mode = match pred_kind.skip_binder() { - ty::PredicateKind::Clause(ty::ClauseKind::Trait(pred)) => { - ChildMode::Trait(pred_kind.rebind(pred)) - } - ty::PredicateKind::Clause(ty::ClauseKind::HostEffect(pred)) => { - ChildMode::Host(pred_kind.rebind(pred)) - } - ty::PredicateKind::NormalizesTo(normalizes_to) - if matches!( - normalizes_to.alias.kind(tcx), - ty::AliasTermKind::ProjectionTy | ty::AliasTermKind::ProjectionConst - ) => - { - ChildMode::Trait(pred_kind.rebind(ty::TraitPredicate { - trait_ref: normalizes_to.alias.trait_ref(tcx), - polarity: ty::PredicatePolarity::Positive, - })) - } - _ => ChildMode::PassThrough, - }; - - let nested_goals = candidate.instantiate_nested_goals(self.span()); - - // If the candidate requires some `T: FnPtr` bound which does not hold should not be treated as - // an actual candidate, instead we should treat them as if the impl was never considered to - // have potentially applied. As if `impl Trait for for<..> fn(..A) -> R` was written - // instead of `impl Trait for T`. - // - // We do this as a separate loop so that we do not choose to tell the user about some nested - // goal before we encounter a `T: FnPtr` nested goal. - for nested_goal in &nested_goals { - if let Some(fn_ptr_trait) = tcx.lang_items().fn_ptr_trait() - && let Some(poly_trait_pred) = nested_goal.goal().predicate.as_trait_clause() - && poly_trait_pred.def_id() == fn_ptr_trait - && let Err(NoSolution) = nested_goal.result() - { - return ControlFlow::Break(self.obligation.clone()); - } - } - - let mut impl_where_bound_count = 0; - for nested_goal in nested_goals { - trace!(nested_goal = ?(nested_goal.goal(), nested_goal.source(), nested_goal.result())); - - let make_obligation = |cause| Obligation { - cause, - param_env: nested_goal.goal().param_env, - predicate: nested_goal.goal().predicate, - recursion_depth: self.obligation.recursion_depth + 1, - }; - - let obligation; - match (child_mode, nested_goal.source()) { - (ChildMode::Trait(_) | ChildMode::Host(_), GoalSource::Misc) => { - continue; - } - (ChildMode::Trait(parent_trait_pred), GoalSource::ImplWhereBound) => { - obligation = make_obligation(derive_cause( - tcx, - candidate.kind(), - self.obligation.cause.clone(), - impl_where_bound_count, - parent_trait_pred, - )); - impl_where_bound_count += 1; - } - ( - ChildMode::Host(parent_host_pred), - GoalSource::ImplWhereBound | GoalSource::AliasBoundConstCondition, - ) => { - obligation = make_obligation(derive_host_cause( - tcx, - candidate.kind(), - self.obligation.cause.clone(), - impl_where_bound_count, - parent_host_pred, - )); - impl_where_bound_count += 1; - } - // Skip over a higher-ranked predicate. - (_, GoalSource::InstantiateHigherRanked) => { - obligation = self.obligation.clone(); - } - (ChildMode::PassThrough, _) - | (_, GoalSource::AliasWellFormed | GoalSource::AliasBoundConstCondition) => { - obligation = make_obligation(self.obligation.cause.clone()); - } - } - - // Skip nested goals that aren't the *reason* for our goal's failure. - match self.consider_ambiguities { - true if matches!( - nested_goal.result(), - Ok(Certainty::Maybe(MaybeCause::Ambiguity)) - ) => {} - false if matches!(nested_goal.result(), Err(_)) => {} - _ => continue, - } - - self.with_derived_obligation(obligation, |this| nested_goal.visit_with(this))?; - } - - // alias-relate may fail because the lhs or rhs can't be normalized, - // and therefore is treated as rigid. - if let Some(ty::PredicateKind::AliasRelate(lhs, rhs, _)) = pred_kind.no_bound_vars() { - if let Some(obligation) = goal - .infcx() - .visit_proof_tree_at_depth( - goal.goal().with(goal.infcx().tcx, ty::ClauseKind::WellFormed(lhs.into())), - goal.depth() + 1, - self, - ) - .break_value() - { - return ControlFlow::Break(obligation); - } else if let Some(obligation) = goal - .infcx() - .visit_proof_tree_at_depth( - goal.goal().with(goal.infcx().tcx, ty::ClauseKind::WellFormed(rhs.into())), - goal.depth() + 1, - self, - ) - .break_value() - { - return ControlFlow::Break(obligation); - } - } - - ControlFlow::Break(self.obligation.clone()) - } -} - -#[derive(Debug, Copy, Clone)] -enum ChildMode<'tcx> { - // Try to derive an `ObligationCause::{ImplDerived,BuiltinDerived}`, - // and skip all `GoalSource::Misc`, which represent useless obligations - // such as alias-eq which may not hold. - Trait(ty::PolyTraitPredicate<'tcx>), - // Try to derive an `ObligationCause::{ImplDerived,BuiltinDerived}`, - // and skip all `GoalSource::Misc`, which represent useless obligations - // such as alias-eq which may not hold. - Host(ty::Binder<'tcx, ty::HostEffectPredicate<'tcx>>), - // Skip trying to derive an `ObligationCause` from this obligation, and - // report *all* sub-obligations as if they came directly from the parent - // obligation. - PassThrough, -} - -fn derive_cause<'tcx>( - tcx: TyCtxt<'tcx>, - candidate_kind: inspect::ProbeKind>, - mut cause: ObligationCause<'tcx>, - idx: usize, - parent_trait_pred: ty::PolyTraitPredicate<'tcx>, -) -> ObligationCause<'tcx> { - match candidate_kind { - inspect::ProbeKind::TraitCandidate { - source: CandidateSource::Impl(impl_def_id), - result: _, - } => { - if let Some((_, span)) = - tcx.predicates_of(impl_def_id).instantiate_identity(tcx).iter().nth(idx) - { - cause = cause.derived_cause(parent_trait_pred, |derived| { - ObligationCauseCode::ImplDerived(Box::new(traits::ImplDerivedCause { - derived, - impl_or_alias_def_id: impl_def_id, - impl_def_predicate_index: Some(idx), - span, - })) - }) - } - } - inspect::ProbeKind::TraitCandidate { - source: CandidateSource::BuiltinImpl(..), - result: _, - } => { - cause = cause.derived_cause(parent_trait_pred, ObligationCauseCode::BuiltinDerived); - } - _ => {} - }; - cause -} - -fn derive_host_cause<'tcx>( - tcx: TyCtxt<'tcx>, - candidate_kind: inspect::ProbeKind>, - mut cause: ObligationCause<'tcx>, - idx: usize, - parent_host_pred: ty::Binder<'tcx, ty::HostEffectPredicate<'tcx>>, -) -> ObligationCause<'tcx> { - match candidate_kind { - inspect::ProbeKind::TraitCandidate { - source: CandidateSource::Impl(impl_def_id), - result: _, - } => { - if let Some((_, span)) = tcx - .predicates_of(impl_def_id) - .instantiate_identity(tcx) - .into_iter() - .chain(tcx.const_conditions(impl_def_id).instantiate_identity(tcx).into_iter().map( - |(trait_ref, span)| { - ( - trait_ref.to_host_effect_clause( - tcx, - parent_host_pred.skip_binder().constness, - ), - span, - ) - }, - )) - .nth(idx) - { - cause = - cause.derived_host_cause(parent_host_pred, |derived| { - ObligationCauseCode::ImplDerivedHost(Box::new( - traits::ImplDerivedHostCause { derived, impl_def_id, span }, - )) - }) - } - } - inspect::ProbeKind::TraitCandidate { - source: CandidateSource::BuiltinImpl(..), - result: _, - } => { - cause = - cause.derived_host_cause(parent_host_pred, ObligationCauseCode::BuiltinDerivedHost); - } - _ => {} - }; - cause -} diff --git a/compiler/rustc_trait_selection/src/solve/fulfill/derive_errors.rs b/compiler/rustc_trait_selection/src/solve/fulfill/derive_errors.rs new file mode 100644 index 0000000000000..c64bc19835ba6 --- /dev/null +++ b/compiler/rustc_trait_selection/src/solve/fulfill/derive_errors.rs @@ -0,0 +1,527 @@ +use std::ops::ControlFlow; + +use rustc_infer::infer::InferCtxt; +use rustc_infer::traits::solve::{CandidateSource, GoalSource, MaybeCause}; +use rustc_infer::traits::{ + self, MismatchedProjectionTypes, Obligation, ObligationCause, ObligationCauseCode, + PredicateObligation, SelectionError, +}; +use rustc_middle::ty::error::{ExpectedFound, TypeError}; +use rustc_middle::ty::{self, TyCtxt}; +use rustc_middle::{bug, span_bug}; +use rustc_next_trait_solver::solve::{GenerateProofTree, SolverDelegateEvalExt as _}; +use rustc_type_ir::solve::{Goal, NoSolution}; +use tracing::{instrument, trace}; + +use crate::solve::Certainty; +use crate::solve::delegate::SolverDelegate; +use crate::solve::inspect::{self, ProofTreeInferCtxtExt, ProofTreeVisitor}; +use crate::traits::{FulfillmentError, FulfillmentErrorCode, wf}; + +pub(super) fn fulfillment_error_for_no_solution<'tcx>( + infcx: &InferCtxt<'tcx>, + root_obligation: PredicateObligation<'tcx>, +) -> FulfillmentError<'tcx> { + let obligation = find_best_leaf_obligation(infcx, &root_obligation, false); + + let code = match obligation.predicate.kind().skip_binder() { + ty::PredicateKind::Clause(ty::ClauseKind::Projection(_)) => { + FulfillmentErrorCode::Project( + // FIXME: This could be a `Sorts` if the term is a type + MismatchedProjectionTypes { err: TypeError::Mismatch }, + ) + } + ty::PredicateKind::Clause(ty::ClauseKind::ConstArgHasType(ct, expected_ty)) => { + let ct_ty = match ct.kind() { + ty::ConstKind::Unevaluated(uv) => { + infcx.tcx.type_of(uv.def).instantiate(infcx.tcx, uv.args) + } + ty::ConstKind::Param(param_ct) => param_ct.find_ty_from_env(obligation.param_env), + ty::ConstKind::Value(cv) => cv.ty, + kind => span_bug!( + obligation.cause.span, + "ConstArgHasWrongType failed but we don't know how to compute type for {kind:?}" + ), + }; + FulfillmentErrorCode::Select(SelectionError::ConstArgHasWrongType { + ct, + ct_ty, + expected_ty, + }) + } + ty::PredicateKind::NormalizesTo(..) => { + FulfillmentErrorCode::Project(MismatchedProjectionTypes { err: TypeError::Mismatch }) + } + ty::PredicateKind::AliasRelate(_, _, _) => { + FulfillmentErrorCode::Project(MismatchedProjectionTypes { err: TypeError::Mismatch }) + } + ty::PredicateKind::Subtype(pred) => { + let (a, b) = infcx.enter_forall_and_leak_universe( + obligation.predicate.kind().rebind((pred.a, pred.b)), + ); + let expected_found = ExpectedFound::new(a, b); + FulfillmentErrorCode::Subtype(expected_found, TypeError::Sorts(expected_found)) + } + ty::PredicateKind::Coerce(pred) => { + let (a, b) = infcx.enter_forall_and_leak_universe( + obligation.predicate.kind().rebind((pred.a, pred.b)), + ); + let expected_found = ExpectedFound::new(b, a); + FulfillmentErrorCode::Subtype(expected_found, TypeError::Sorts(expected_found)) + } + ty::PredicateKind::Clause(_) + | ty::PredicateKind::DynCompatible(_) + | ty::PredicateKind::Ambiguous => { + FulfillmentErrorCode::Select(SelectionError::Unimplemented) + } + ty::PredicateKind::ConstEquate(..) => { + bug!("unexpected goal: {obligation:?}") + } + }; + + FulfillmentError { obligation, code, root_obligation } +} + +pub(super) fn fulfillment_error_for_stalled<'tcx>( + infcx: &InferCtxt<'tcx>, + root_obligation: PredicateObligation<'tcx>, +) -> FulfillmentError<'tcx> { + let (code, refine_obligation) = infcx.probe(|_| { + match <&SolverDelegate<'tcx>>::from(infcx) + .evaluate_root_goal(root_obligation.clone().into(), GenerateProofTree::No) + .0 + { + Ok((_, Certainty::Maybe(MaybeCause::Ambiguity))) => { + (FulfillmentErrorCode::Ambiguity { overflow: None }, true) + } + Ok((_, Certainty::Maybe(MaybeCause::Overflow { suggest_increasing_limit }))) => ( + FulfillmentErrorCode::Ambiguity { overflow: Some(suggest_increasing_limit) }, + // Don't look into overflows because we treat overflows weirdly anyways. + // We discard the inference constraints from overflowing goals, so + // recomputing the goal again during `find_best_leaf_obligation` may apply + // inference guidance that makes other goals go from ambig -> pass, for example. + // + // FIXME: We should probably just look into overflows here. + false, + ), + Ok((_, Certainty::Yes)) => { + bug!("did not expect successful goal when collecting ambiguity errors") + } + Err(_) => { + bug!("did not expect selection error when collecting ambiguity errors") + } + } + }); + + FulfillmentError { + obligation: if refine_obligation { + find_best_leaf_obligation(infcx, &root_obligation, true) + } else { + root_obligation.clone() + }, + code, + root_obligation, + } +} + +pub(super) fn fulfillment_error_for_overflow<'tcx>( + infcx: &InferCtxt<'tcx>, + root_obligation: PredicateObligation<'tcx>, +) -> FulfillmentError<'tcx> { + FulfillmentError { + obligation: find_best_leaf_obligation(infcx, &root_obligation, true), + code: FulfillmentErrorCode::Ambiguity { overflow: Some(true) }, + root_obligation, + } +} + +fn find_best_leaf_obligation<'tcx>( + infcx: &InferCtxt<'tcx>, + obligation: &PredicateObligation<'tcx>, + consider_ambiguities: bool, +) -> PredicateObligation<'tcx> { + let obligation = infcx.resolve_vars_if_possible(obligation.clone()); + // FIXME: we use a probe here as the `BestObligation` visitor does not + // check whether it uses candidates which get shadowed by where-bounds. + // + // We should probably fix the visitor to not do so instead, as this also + // means the leaf obligation may be incorrect. + infcx + .fudge_inference_if_ok(|| { + infcx + .visit_proof_tree(obligation.clone().into(), &mut BestObligation { + obligation: obligation.clone(), + consider_ambiguities, + }) + .break_value() + .ok_or(()) + }) + .unwrap_or(obligation) +} + +struct BestObligation<'tcx> { + obligation: PredicateObligation<'tcx>, + consider_ambiguities: bool, +} + +impl<'tcx> BestObligation<'tcx> { + fn with_derived_obligation( + &mut self, + derived_obligation: PredicateObligation<'tcx>, + and_then: impl FnOnce(&mut Self) -> >::Result, + ) -> >::Result { + let old_obligation = std::mem::replace(&mut self.obligation, derived_obligation); + let res = and_then(self); + self.obligation = old_obligation; + res + } + + /// Filter out the candidates that aren't interesting to visit for the + /// purposes of reporting errors. For ambiguities, we only consider + /// candidates that may hold. For errors, we only consider candidates that + /// *don't* hold and which have impl-where clauses that also don't hold. + fn non_trivial_candidates<'a>( + &self, + goal: &'a inspect::InspectGoal<'a, 'tcx>, + ) -> Vec> { + let mut candidates = goal.candidates(); + match self.consider_ambiguities { + true => { + // If we have an ambiguous obligation, we must consider *all* candidates + // that hold, or else we may guide inference causing other goals to go + // from ambig -> pass/fail. + candidates.retain(|candidate| candidate.result().is_ok()); + } + false => { + // If we have >1 candidate, one may still be due to "boring" reasons, like + // an alias-relate that failed to hold when deeply evaluated. We really + // don't care about reasons like this. + if candidates.len() > 1 { + candidates.retain(|candidate| { + goal.infcx().probe(|_| { + candidate.instantiate_nested_goals(self.span()).iter().any( + |nested_goal| { + matches!( + nested_goal.source(), + GoalSource::ImplWhereBound + | GoalSource::AliasBoundConstCondition + | GoalSource::InstantiateHigherRanked + | GoalSource::AliasWellFormed + ) && match (self.consider_ambiguities, nested_goal.result()) { + (true, Ok(Certainty::Maybe(MaybeCause::Ambiguity))) + | (false, Err(_)) => true, + _ => false, + } + }, + ) + }) + }); + } + + // Prefer a non-rigid candidate if there is one. + if candidates.len() > 1 { + candidates.retain(|candidate| { + !matches!(candidate.kind(), inspect::ProbeKind::RigidAlias { .. }) + }); + } + } + } + + candidates + } + + /// HACK: We walk the nested obligations for a well-formed arg manually, + /// since there's nontrivial logic in `wf.rs` to set up an obligation cause. + /// Ideally we'd be able to track this better. + fn visit_well_formed_goal( + &mut self, + candidate: &inspect::InspectCandidate<'_, 'tcx>, + arg: ty::GenericArg<'tcx>, + ) -> ControlFlow> { + let infcx = candidate.goal().infcx(); + let param_env = candidate.goal().goal().param_env; + let body_id = self.obligation.cause.body_id; + + for obligation in wf::unnormalized_obligations(infcx, param_env, arg, self.span(), body_id) + .into_iter() + .flatten() + { + let nested_goal = candidate.instantiate_proof_tree_for_nested_goal( + GoalSource::Misc, + Goal::new(infcx.tcx, obligation.param_env, obligation.predicate), + self.span(), + ); + // Skip nested goals that aren't the *reason* for our goal's failure. + match (self.consider_ambiguities, nested_goal.result()) { + (true, Ok(Certainty::Maybe(MaybeCause::Ambiguity))) | (false, Err(_)) => {} + _ => continue, + } + + self.with_derived_obligation(obligation, |this| nested_goal.visit_with(this))?; + } + + ControlFlow::Break(self.obligation.clone()) + } +} + +impl<'tcx> ProofTreeVisitor<'tcx> for BestObligation<'tcx> { + type Result = ControlFlow>; + + fn span(&self) -> rustc_span::Span { + self.obligation.cause.span + } + + #[instrument(level = "trace", skip(self, goal), fields(goal = ?goal.goal()))] + fn visit_goal(&mut self, goal: &inspect::InspectGoal<'_, 'tcx>) -> Self::Result { + let candidates = self.non_trivial_candidates(goal); + trace!(candidates = ?candidates.iter().map(|c| c.kind()).collect::>()); + + let [candidate] = candidates.as_slice() else { + return ControlFlow::Break(self.obligation.clone()); + }; + + // Don't walk into impls that have `do_not_recommend`. + if let inspect::ProbeKind::TraitCandidate { + source: CandidateSource::Impl(impl_def_id), + result: _, + } = candidate.kind() + && goal.infcx().tcx.do_not_recommend_impl(impl_def_id) + { + return ControlFlow::Break(self.obligation.clone()); + } + + let tcx = goal.infcx().tcx; + // FIXME: Also, what about considering >1 layer up the stack? May be necessary + // for normalizes-to. + let pred_kind = goal.goal().predicate.kind(); + let child_mode = match pred_kind.skip_binder() { + ty::PredicateKind::Clause(ty::ClauseKind::Trait(pred)) => { + ChildMode::Trait(pred_kind.rebind(pred)) + } + ty::PredicateKind::Clause(ty::ClauseKind::HostEffect(pred)) => { + ChildMode::Host(pred_kind.rebind(pred)) + } + ty::PredicateKind::NormalizesTo(normalizes_to) + if matches!( + normalizes_to.alias.kind(tcx), + ty::AliasTermKind::ProjectionTy | ty::AliasTermKind::ProjectionConst + ) => + { + ChildMode::Trait(pred_kind.rebind(ty::TraitPredicate { + trait_ref: normalizes_to.alias.trait_ref(tcx), + polarity: ty::PredicatePolarity::Positive, + })) + } + ty::PredicateKind::Clause(ty::ClauseKind::WellFormed(arg)) => { + return self.visit_well_formed_goal(candidate, arg); + } + _ => ChildMode::PassThrough, + }; + + let nested_goals = candidate.instantiate_nested_goals(self.span()); + + // If the candidate requires some `T: FnPtr` bound which does not hold should not be treated as + // an actual candidate, instead we should treat them as if the impl was never considered to + // have potentially applied. As if `impl Trait for for<..> fn(..A) -> R` was written + // instead of `impl Trait for T`. + // + // We do this as a separate loop so that we do not choose to tell the user about some nested + // goal before we encounter a `T: FnPtr` nested goal. + for nested_goal in &nested_goals { + if let Some(fn_ptr_trait) = tcx.lang_items().fn_ptr_trait() + && let Some(poly_trait_pred) = nested_goal.goal().predicate.as_trait_clause() + && poly_trait_pred.def_id() == fn_ptr_trait + && let Err(NoSolution) = nested_goal.result() + { + return ControlFlow::Break(self.obligation.clone()); + } + } + + let mut impl_where_bound_count = 0; + for nested_goal in nested_goals { + trace!(nested_goal = ?(nested_goal.goal(), nested_goal.source(), nested_goal.result())); + + let make_obligation = |cause| Obligation { + cause, + param_env: nested_goal.goal().param_env, + predicate: nested_goal.goal().predicate, + recursion_depth: self.obligation.recursion_depth + 1, + }; + + let obligation; + match (child_mode, nested_goal.source()) { + (ChildMode::Trait(_) | ChildMode::Host(_), GoalSource::Misc) => { + continue; + } + (ChildMode::Trait(parent_trait_pred), GoalSource::ImplWhereBound) => { + obligation = make_obligation(derive_cause( + tcx, + candidate.kind(), + self.obligation.cause.clone(), + impl_where_bound_count, + parent_trait_pred, + )); + impl_where_bound_count += 1; + } + ( + ChildMode::Host(parent_host_pred), + GoalSource::ImplWhereBound | GoalSource::AliasBoundConstCondition, + ) => { + obligation = make_obligation(derive_host_cause( + tcx, + candidate.kind(), + self.obligation.cause.clone(), + impl_where_bound_count, + parent_host_pred, + )); + impl_where_bound_count += 1; + } + // Skip over a higher-ranked predicate. + (_, GoalSource::InstantiateHigherRanked) => { + obligation = self.obligation.clone(); + } + (ChildMode::PassThrough, _) + | (_, GoalSource::AliasWellFormed | GoalSource::AliasBoundConstCondition) => { + obligation = make_obligation(self.obligation.cause.clone()); + } + } + + // Skip nested goals that aren't the *reason* for our goal's failure. + match (self.consider_ambiguities, nested_goal.result()) { + (true, Ok(Certainty::Maybe(MaybeCause::Ambiguity))) | (false, Err(_)) => {} + _ => continue, + } + + self.with_derived_obligation(obligation, |this| nested_goal.visit_with(this))?; + } + + // alias-relate may fail because the lhs or rhs can't be normalized, + // and therefore is treated as rigid. + if let Some(ty::PredicateKind::AliasRelate(lhs, rhs, _)) = pred_kind.no_bound_vars() { + if let Some(obligation) = goal + .infcx() + .visit_proof_tree_at_depth( + goal.goal().with(goal.infcx().tcx, ty::ClauseKind::WellFormed(lhs.into())), + goal.depth() + 1, + self, + ) + .break_value() + { + return ControlFlow::Break(obligation); + } else if let Some(obligation) = goal + .infcx() + .visit_proof_tree_at_depth( + goal.goal().with(goal.infcx().tcx, ty::ClauseKind::WellFormed(rhs.into())), + goal.depth() + 1, + self, + ) + .break_value() + { + return ControlFlow::Break(obligation); + } + } + + ControlFlow::Break(self.obligation.clone()) + } +} + +#[derive(Debug, Copy, Clone)] +enum ChildMode<'tcx> { + // Try to derive an `ObligationCause::{ImplDerived,BuiltinDerived}`, + // and skip all `GoalSource::Misc`, which represent useless obligations + // such as alias-eq which may not hold. + Trait(ty::PolyTraitPredicate<'tcx>), + // Try to derive an `ObligationCause::{ImplDerived,BuiltinDerived}`, + // and skip all `GoalSource::Misc`, which represent useless obligations + // such as alias-eq which may not hold. + Host(ty::Binder<'tcx, ty::HostEffectPredicate<'tcx>>), + // Skip trying to derive an `ObligationCause` from this obligation, and + // report *all* sub-obligations as if they came directly from the parent + // obligation. + PassThrough, +} + +fn derive_cause<'tcx>( + tcx: TyCtxt<'tcx>, + candidate_kind: inspect::ProbeKind>, + mut cause: ObligationCause<'tcx>, + idx: usize, + parent_trait_pred: ty::PolyTraitPredicate<'tcx>, +) -> ObligationCause<'tcx> { + match candidate_kind { + inspect::ProbeKind::TraitCandidate { + source: CandidateSource::Impl(impl_def_id), + result: _, + } => { + if let Some((_, span)) = + tcx.predicates_of(impl_def_id).instantiate_identity(tcx).iter().nth(idx) + { + cause = cause.derived_cause(parent_trait_pred, |derived| { + ObligationCauseCode::ImplDerived(Box::new(traits::ImplDerivedCause { + derived, + impl_or_alias_def_id: impl_def_id, + impl_def_predicate_index: Some(idx), + span, + })) + }) + } + } + inspect::ProbeKind::TraitCandidate { + source: CandidateSource::BuiltinImpl(..), + result: _, + } => { + cause = cause.derived_cause(parent_trait_pred, ObligationCauseCode::BuiltinDerived); + } + _ => {} + }; + cause +} + +fn derive_host_cause<'tcx>( + tcx: TyCtxt<'tcx>, + candidate_kind: inspect::ProbeKind>, + mut cause: ObligationCause<'tcx>, + idx: usize, + parent_host_pred: ty::Binder<'tcx, ty::HostEffectPredicate<'tcx>>, +) -> ObligationCause<'tcx> { + match candidate_kind { + inspect::ProbeKind::TraitCandidate { + source: CandidateSource::Impl(impl_def_id), + result: _, + } => { + if let Some((_, span)) = tcx + .predicates_of(impl_def_id) + .instantiate_identity(tcx) + .into_iter() + .chain(tcx.const_conditions(impl_def_id).instantiate_identity(tcx).into_iter().map( + |(trait_ref, span)| { + ( + trait_ref.to_host_effect_clause( + tcx, + parent_host_pred.skip_binder().constness, + ), + span, + ) + }, + )) + .nth(idx) + { + cause = + cause.derived_host_cause(parent_host_pred, |derived| { + ObligationCauseCode::ImplDerivedHost(Box::new( + traits::ImplDerivedHostCause { derived, impl_def_id, span }, + )) + }) + } + } + inspect::ProbeKind::TraitCandidate { + source: CandidateSource::BuiltinImpl(..), + result: _, + } => { + cause = + cause.derived_host_cause(parent_host_pred, ObligationCauseCode::BuiltinDerivedHost); + } + _ => {} + }; + cause +} diff --git a/compiler/rustc_trait_selection/src/solve/inspect/analyse.rs b/compiler/rustc_trait_selection/src/solve/inspect/analyse.rs index e735020a63e66..9ba48cd588fa1 100644 --- a/compiler/rustc_trait_selection/src/solve/inspect/analyse.rs +++ b/compiler/rustc_trait_selection/src/solve/inspect/analyse.rs @@ -194,47 +194,57 @@ impl<'a, 'tcx> InspectCandidate<'a, 'tcx> { let goals = instantiated_goals .into_iter() - .map(|(source, goal)| match goal.predicate.kind().no_bound_vars() { - Some(ty::PredicateKind::NormalizesTo(ty::NormalizesTo { alias, term })) => { - let unconstrained_term = match term.unpack() { - ty::TermKind::Ty(_) => infcx.next_ty_var(span).into(), - ty::TermKind::Const(_) => infcx.next_const_var(span).into(), - }; - let goal = - goal.with(infcx.tcx, ty::NormalizesTo { alias, term: unconstrained_term }); - // We have to use a `probe` here as evaluating a `NormalizesTo` can constrain the - // expected term. This means that candidates which only fail due to nested goals - // and which normalize to a different term then the final result could ICE: when - // building their proof tree, the expected term was unconstrained, but when - // instantiating the candidate it is already constrained to the result of another - // candidate. - let proof_tree = infcx - .probe(|_| infcx.evaluate_root_goal_raw(goal, GenerateProofTree::Yes).1); - InspectGoal::new( - infcx, - self.goal.depth + 1, - proof_tree.unwrap(), - Some(NormalizesToTermHack { term, unconstrained_term }), - source, - ) - } - _ => { - // We're using a probe here as evaluating a goal could constrain - // inference variables by choosing one candidate. If we then recurse - // into another candidate who ends up with different inference - // constraints, we get an ICE if we already applied the constraints - // from the chosen candidate. - let proof_tree = infcx - .probe(|_| infcx.evaluate_root_goal(goal, GenerateProofTree::Yes).1) - .unwrap(); - InspectGoal::new(infcx, self.goal.depth + 1, proof_tree, None, source) - } - }) + .map(|(source, goal)| self.instantiate_proof_tree_for_nested_goal(source, goal, span)) .collect(); (goals, opt_impl_args) } + pub fn instantiate_proof_tree_for_nested_goal( + &self, + source: GoalSource, + goal: Goal<'tcx, ty::Predicate<'tcx>>, + span: Span, + ) -> InspectGoal<'a, 'tcx> { + let infcx = self.goal.infcx; + match goal.predicate.kind().no_bound_vars() { + Some(ty::PredicateKind::NormalizesTo(ty::NormalizesTo { alias, term })) => { + let unconstrained_term = match term.unpack() { + ty::TermKind::Ty(_) => infcx.next_ty_var(span).into(), + ty::TermKind::Const(_) => infcx.next_const_var(span).into(), + }; + let goal = + goal.with(infcx.tcx, ty::NormalizesTo { alias, term: unconstrained_term }); + // We have to use a `probe` here as evaluating a `NormalizesTo` can constrain the + // expected term. This means that candidates which only fail due to nested goals + // and which normalize to a different term then the final result could ICE: when + // building their proof tree, the expected term was unconstrained, but when + // instantiating the candidate it is already constrained to the result of another + // candidate. + let proof_tree = + infcx.probe(|_| infcx.evaluate_root_goal_raw(goal, GenerateProofTree::Yes).1); + InspectGoal::new( + infcx, + self.goal.depth + 1, + proof_tree.unwrap(), + Some(NormalizesToTermHack { term, unconstrained_term }), + source, + ) + } + _ => { + // We're using a probe here as evaluating a goal could constrain + // inference variables by choosing one candidate. If we then recurse + // into another candidate who ends up with different inference + // constraints, we get an ICE if we already applied the constraints + // from the chosen candidate. + let proof_tree = infcx + .probe(|_| infcx.evaluate_root_goal(goal, GenerateProofTree::Yes).1) + .unwrap(); + InspectGoal::new(infcx, self.goal.depth + 1, proof_tree, None, source) + } + } + } + /// Visit all nested goals of this candidate, rolling back /// all inference constraints. pub fn visit_nested_in_probe>(&self, visitor: &mut V) -> V::Result { diff --git a/compiler/rustc_trait_selection/src/traits/mod.rs b/compiler/rustc_trait_selection/src/traits/mod.rs index 6b5ebade6aedb..d4a9664e28280 100644 --- a/compiler/rustc_trait_selection/src/traits/mod.rs +++ b/compiler/rustc_trait_selection/src/traits/mod.rs @@ -76,6 +76,7 @@ use crate::infer::{InferCtxt, TyCtxtInferExt}; use crate::regions::InferCtxtRegionExt; use crate::traits::query::evaluate_obligation::InferCtxtExt as _; +#[derive(Debug)] pub struct FulfillmentError<'tcx> { pub obligation: PredicateObligation<'tcx>, pub code: FulfillmentErrorCode<'tcx>, @@ -107,12 +108,6 @@ impl<'tcx> FulfillmentError<'tcx> { } } -impl<'tcx> Debug for FulfillmentError<'tcx> { - fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { - write!(f, "FulfillmentError({:?},{:?})", self.obligation, self.code) - } -} - #[derive(Clone)] pub enum FulfillmentErrorCode<'tcx> { /// Inherently impossible to fulfill; this trait is implemented if and only diff --git a/compiler/rustc_trait_selection/src/traits/query/type_op/implied_outlives_bounds.rs b/compiler/rustc_trait_selection/src/traits/query/type_op/implied_outlives_bounds.rs index 1339739ce7f5e..ec0b790339691 100644 --- a/compiler/rustc_trait_selection/src/traits/query/type_op/implied_outlives_bounds.rs +++ b/compiler/rustc_trait_selection/src/traits/query/type_op/implied_outlives_bounds.rs @@ -5,8 +5,8 @@ use rustc_infer::traits::query::type_op::ImpliedOutlivesBounds; use rustc_middle::infer::canonical::CanonicalQueryResponse; use rustc_middle::traits::ObligationCause; use rustc_middle::ty::{self, ParamEnvAnd, Ty, TyCtxt, TypeFolder, TypeVisitableExt}; -use rustc_span::Span; use rustc_span::def_id::CRATE_DEF_ID; +use rustc_span::{DUMMY_SP, Span}; use rustc_type_ir::outlives::{Component, push_outlives_components}; use smallvec::{SmallVec, smallvec}; use tracing::debug; @@ -92,7 +92,9 @@ pub fn compute_implied_outlives_bounds_inner<'tcx>( // From the full set of obligations, just filter down to the region relationships. for obligation in - wf::unnormalized_obligations(ocx.infcx, param_env, arg).into_iter().flatten() + wf::unnormalized_obligations(ocx.infcx, param_env, arg, DUMMY_SP, CRATE_DEF_ID) + .into_iter() + .flatten() { assert!(!obligation.has_escaping_bound_vars()); let Some(pred) = obligation.predicate.kind().no_bound_vars() else { diff --git a/compiler/rustc_trait_selection/src/traits/wf.rs b/compiler/rustc_trait_selection/src/traits/wf.rs index 20b675bcb76b7..37d49cc2f555f 100644 --- a/compiler/rustc_trait_selection/src/traits/wf.rs +++ b/compiler/rustc_trait_selection/src/traits/wf.rs @@ -8,8 +8,8 @@ use rustc_middle::ty::{ self, GenericArg, GenericArgKind, GenericArgsRef, Ty, TyCtxt, TypeSuperVisitable, TypeVisitable, TypeVisitableExt, TypeVisitor, }; -use rustc_span::def_id::{CRATE_DEF_ID, DefId, LocalDefId}; -use rustc_span::{DUMMY_SP, Span}; +use rustc_span::Span; +use rustc_span::def_id::{DefId, LocalDefId}; use tracing::{debug, instrument, trace}; use crate::infer::InferCtxt; @@ -89,6 +89,8 @@ pub fn unnormalized_obligations<'tcx>( infcx: &InferCtxt<'tcx>, param_env: ty::ParamEnv<'tcx>, arg: GenericArg<'tcx>, + span: Span, + body_id: LocalDefId, ) -> Option> { debug_assert_eq!(arg, infcx.resolve_vars_if_possible(arg)); @@ -106,8 +108,8 @@ pub fn unnormalized_obligations<'tcx>( let mut wf = WfPredicates { infcx, param_env, - body_id: CRATE_DEF_ID, - span: DUMMY_SP, + body_id, + span, out: PredicateObligations::new(), recursion_depth: 0, item: None, diff --git a/library/alloc/src/string.rs b/library/alloc/src/string.rs index 0c9535dfaa628..b29f740ef0f2a 100644 --- a/library/alloc/src/string.rs +++ b/library/alloc/src/string.rs @@ -712,8 +712,8 @@ impl String { } } - /// Decode a UTF-16–encoded vector `v` into a `String`, returning [`Err`] - /// if `v` contains any invalid data. + /// Decode a native endian UTF-16–encoded vector `v` into a `String`, + /// returning [`Err`] if `v` contains any invalid data. /// /// # Examples /// @@ -745,8 +745,8 @@ impl String { Ok(ret) } - /// Decode a UTF-16–encoded slice `v` into a `String`, replacing - /// invalid data with [the replacement character (`U+FFFD`)][U+FFFD]. + /// Decode a native endian UTF-16–encoded slice `v` into a `String`, + /// replacing invalid data with [the replacement character (`U+FFFD`)][U+FFFD]. /// /// Unlike [`from_utf8_lossy`] which returns a [`Cow<'a, str>`], /// `from_utf16_lossy` returns a `String` since the UTF-16 to UTF-8 @@ -777,8 +777,8 @@ impl String { .collect() } - /// Decode a UTF-16LE–encoded vector `v` into a `String`, returning [`Err`] - /// if `v` contains any invalid data. + /// Decode a UTF-16LE–encoded vector `v` into a `String`, + /// returning [`Err`] if `v` contains any invalid data. /// /// # Examples /// @@ -852,8 +852,8 @@ impl String { } } - /// Decode a UTF-16BE–encoded vector `v` into a `String`, returning [`Err`] - /// if `v` contains any invalid data. + /// Decode a UTF-16BE–encoded vector `v` into a `String`, + /// returning [`Err`] if `v` contains any invalid data. /// /// # Examples /// diff --git a/library/core/src/char/methods.rs b/library/core/src/char/methods.rs index fb8a740aced13..ccfdbf0eb704d 100644 --- a/library/core/src/char/methods.rs +++ b/library/core/src/char/methods.rs @@ -92,7 +92,7 @@ impl char { #[stable(feature = "assoc_char_consts", since = "1.52.0")] pub const UNICODE_VERSION: (u8, u8, u8) = crate::unicode::UNICODE_VERSION; - /// Creates an iterator over the UTF-16 encoded code points in `iter`, + /// Creates an iterator over the native endian UTF-16 encoded code points in `iter`, /// returning unpaired surrogates as `Err`s. /// /// # Examples @@ -704,7 +704,7 @@ impl char { unsafe { from_utf8_unchecked_mut(encode_utf8_raw(self as u32, dst)) } } - /// Encodes this character as UTF-16 into the provided `u16` buffer, + /// Encodes this character as native endian UTF-16 into the provided `u16` buffer, /// and then returns the subslice of the buffer that contains the encoded character. /// /// # Panics @@ -1828,7 +1828,7 @@ pub const fn encode_utf8_raw(code: u32, dst: &mut [u8]) -> &mut [u8] { unsafe { slice::from_raw_parts_mut(dst.as_mut_ptr(), len) } } -/// Encodes a raw `u32` value as UTF-16 into the provided `u16` buffer, +/// Encodes a raw `u32` value as native endian UTF-16 into the provided `u16` buffer, /// and then returns the subslice of the buffer that contains the encoded character. /// /// Unlike `char::encode_utf16`, this method also handles codepoints in the surrogate range. diff --git a/library/core/src/marker.rs b/library/core/src/marker.rs index a793fc2aa2e55..18ada14d101b5 100644 --- a/library/core/src/marker.rs +++ b/library/core/src/marker.rs @@ -1091,7 +1091,195 @@ pub trait FnPtr: Copy + Clone { fn addr(self) -> *const (); } -/// Derive macro generating impls of traits related to smart pointers. +/// Derive macro that makes a smart pointer usable with trait objects. +/// +/// # What this macro does +/// +/// This macro is intended to be used with user-defined pointer types, and makes it possible to +/// perform coercions on the pointee of the user-defined pointer. There are two aspects to this: +/// +/// ## Unsizing coercions of the pointee +/// +/// By using the macro, the following example will compile: +/// ``` +/// #![feature(derive_coerce_pointee)] +/// use std::marker::CoercePointee; +/// use std::ops::Deref; +/// +/// #[derive(CoercePointee)] +/// #[repr(transparent)] +/// struct MySmartPointer(Box); +/// +/// impl Deref for MySmartPointer { +/// type Target = T; +/// fn deref(&self) -> &T { +/// &self.0 +/// } +/// } +/// +/// trait MyTrait {} +/// +/// impl MyTrait for i32 {} +/// +/// fn main() { +/// let ptr: MySmartPointer = MySmartPointer(Box::new(4)); +/// +/// // This coercion would be an error without the derive. +/// let ptr: MySmartPointer = ptr; +/// } +/// ``` +/// Without the `#[derive(CoercePointee)]` macro, this example would fail with the following error: +/// ```text +/// error[E0308]: mismatched types +/// --> src/main.rs:11:44 +/// | +/// 11 | let ptr: MySmartPointer = ptr; +/// | --------------------------- ^^^ expected `MySmartPointer`, found `MySmartPointer` +/// | | +/// | expected due to this +/// | +/// = note: expected struct `MySmartPointer` +/// found struct `MySmartPointer` +/// = help: `i32` implements `MyTrait` so you could box the found value and coerce it to the trait object `Box`, you will have to change the expected type as well +/// ``` +/// +/// ## Dyn compatibility +/// +/// This macro allows you to dispatch on the user-defined pointer type. That is, traits using the +/// type as a receiver are dyn-compatible. For example, this compiles: +/// +/// ``` +/// #![feature(arbitrary_self_types, derive_coerce_pointee)] +/// use std::marker::CoercePointee; +/// use std::ops::Deref; +/// +/// #[derive(CoercePointee)] +/// #[repr(transparent)] +/// struct MySmartPointer(Box); +/// +/// impl Deref for MySmartPointer { +/// type Target = T; +/// fn deref(&self) -> &T { +/// &self.0 +/// } +/// } +/// +/// // You can always define this trait. (as long as you have #![feature(arbitrary_self_types)]) +/// trait MyTrait { +/// fn func(self: MySmartPointer); +/// } +/// +/// // But using `dyn MyTrait` requires #[derive(CoercePointee)]. +/// fn call_func(value: MySmartPointer) { +/// value.func(); +/// } +/// ``` +/// If you remove the `#[derive(CoercePointee)]` annotation from the struct, then the above example +/// will fail with this error message: +/// ```text +/// error[E0038]: the trait `MyTrait` is not dyn compatible +/// --> src/lib.rs:21:36 +/// | +/// 17 | fn func(self: MySmartPointer); +/// | -------------------- help: consider changing method `func`'s `self` parameter to be `&self`: `&Self` +/// ... +/// 21 | fn call_func(value: MySmartPointer) { +/// | ^^^^^^^^^^^ `MyTrait` is not dyn compatible +/// | +/// note: for a trait to be dyn compatible it needs to allow building a vtable +/// for more information, visit +/// --> src/lib.rs:17:19 +/// | +/// 16 | trait MyTrait { +/// | ------- this trait is not dyn compatible... +/// 17 | fn func(self: MySmartPointer); +/// | ^^^^^^^^^^^^^^^^^^^^ ...because method `func`'s `self` parameter cannot be dispatched on +/// ``` +/// +/// # Requirements for using the macro +/// +/// This macro can only be used if: +/// * The type is a `#[repr(transparent)]` struct. +/// * The type of its non-zero-sized field must either be a standard library pointer type +/// (reference, raw pointer, `NonNull`, `Box`, `Rc`, `Arc`, etc.) or another user-defined type +/// also using the `#[derive(CoercePointee)]` macro. +/// * Zero-sized fields must not mention any generic parameters unless the zero-sized field has +/// type [`PhantomData`]. +/// +/// ## Multiple type parameters +/// +/// If the type has multiple type parameters, then you must explicitly specify which one should be +/// used for dynamic dispatch. For example: +/// ``` +/// # #![feature(derive_coerce_pointee)] +/// # use std::marker::{CoercePointee, PhantomData}; +/// #[derive(CoercePointee)] +/// #[repr(transparent)] +/// struct MySmartPointer<#[pointee] T: ?Sized, U> { +/// ptr: Box, +/// _phantom: PhantomData, +/// } +/// ``` +/// Specifying `#[pointee]` when the struct has only one type parameter is allowed, but not required. +/// +/// # Examples +/// +/// A custom implementation of the `Rc` type: +/// ``` +/// #![feature(derive_coerce_pointee)] +/// use std::marker::CoercePointee; +/// use std::ops::Deref; +/// use std::ptr::NonNull; +/// +/// #[derive(CoercePointee)] +/// #[repr(transparent)] +/// pub struct Rc { +/// inner: NonNull>, +/// } +/// +/// struct RcInner { +/// refcount: usize, +/// value: T, +/// } +/// +/// impl Deref for Rc { +/// type Target = T; +/// fn deref(&self) -> &T { +/// let ptr = self.inner.as_ptr(); +/// unsafe { &(*ptr).value } +/// } +/// } +/// +/// impl Rc { +/// pub fn new(value: T) -> Self { +/// let inner = Box::new(RcInner { +/// refcount: 1, +/// value, +/// }); +/// Self { +/// inner: NonNull::from(Box::leak(inner)), +/// } +/// } +/// } +/// +/// impl Clone for Rc { +/// fn clone(&self) -> Self { +/// // A real implementation would handle overflow here. +/// unsafe { (*self.inner.as_ptr()).refcount += 1 }; +/// Self { inner: self.inner } +/// } +/// } +/// +/// impl Drop for Rc { +/// fn drop(&mut self) { +/// let ptr = self.inner.as_ptr(); +/// unsafe { (*ptr).refcount -= 1 }; +/// if unsafe { (*ptr).refcount } == 0 { +/// drop(unsafe { Box::from_raw(ptr) }); +/// } +/// } +/// } +/// ``` #[rustc_builtin_macro(CoercePointee, attributes(pointee))] #[allow_internal_unstable(dispatch_from_dyn, coerce_unsized, unsize)] #[unstable(feature = "derive_coerce_pointee", issue = "123430")] diff --git a/library/core/src/slice/sort/stable/drift.rs b/library/core/src/slice/sort/stable/drift.rs index 644e75a4581e9..cf1df1e91a50d 100644 --- a/library/core/src/slice/sort/stable/drift.rs +++ b/library/core/src/slice/sort/stable/drift.rs @@ -10,8 +10,8 @@ use crate::{cmp, intrinsics}; /// Sorts `v` based on comparison function `is_less`. If `eager_sort` is true, /// it will only do small-sorts and physical merges, ensuring O(N * log(N)) -/// worst-case complexity. `scratch.len()` must be at least `max(v.len() / 2, -/// MIN_SMALL_SORT_SCRATCH_LEN)` otherwise the implementation may abort. +/// worst-case complexity. `scratch.len()` must be at least +/// `max(v.len() - v.len() / 2, SMALL_SORT_GENERAL_SCRATCH_LEN)` otherwise the implementation may abort. /// Fully ascending and descending inputs will be sorted with exactly N - 1 /// comparisons. /// diff --git a/library/core/src/slice/sort/stable/mod.rs b/library/core/src/slice/sort/stable/mod.rs index 7adcc83b818d1..3ff2e71fd05bc 100644 --- a/library/core/src/slice/sort/stable/mod.rs +++ b/library/core/src/slice/sort/stable/mod.rs @@ -41,6 +41,8 @@ pub fn sort bool, BufT: BufGuard>(v: &mut [T], is_less cfg_if! { if #[cfg(any(feature = "optimize_for_size", target_pointer_width = "16"))] { + // Unlike driftsort, mergesort only requires len / 2, + // not len - len / 2. let alloc_len = len / 2; cfg_if! { @@ -91,16 +93,26 @@ fn driftsort_main bool, BufT: BufGuard>(v: &mut [T], i // By allocating n elements of memory we can ensure the entire input can // be sorted using stable quicksort, which allows better performance on // random and low-cardinality distributions. However, we still want to - // reduce our memory usage to n / 2 for large inputs. We do this by scaling - // our allocation as max(n / 2, min(n, 8MB)), ensuring we scale like n for - // small inputs and n / 2 for large inputs, without a sudden drop off. We - // also need to ensure our alloc >= MIN_SMALL_SORT_SCRATCH_LEN, as the + // reduce our memory usage to n - n / 2 for large inputs. We do this by scaling + // our allocation as max(n - n / 2, min(n, 8MB)), ensuring we scale like n for + // small inputs and n - n / 2 for large inputs, without a sudden drop off. We + // also need to ensure our alloc >= SMALL_SORT_GENERAL_SCRATCH_LEN, as the // small-sort always needs this much memory. + // + // driftsort will produce unsorted runs of up to min_good_run_len, which + // is at most len - len / 2. + // Unsorted runs need to be processed by quicksort, which requires as much + // scratch space as the run length, therefore the scratch space must be at + // least len - len / 2. + // If min_good_run_len is ever modified, this code must be updated to allocate + // the correct scratch size for it. const MAX_FULL_ALLOC_BYTES: usize = 8_000_000; // 8MB let max_full_alloc = MAX_FULL_ALLOC_BYTES / mem::size_of::(); let len = v.len(); - let alloc_len = - cmp::max(cmp::max(len / 2, cmp::min(len, max_full_alloc)), SMALL_SORT_GENERAL_SCRATCH_LEN); + let alloc_len = cmp::max( + cmp::max(len - len / 2, cmp::min(len, max_full_alloc)), + SMALL_SORT_GENERAL_SCRATCH_LEN, + ); // For small inputs 4KiB of stack storage suffices, which allows us to avoid // calling the (de-)allocator. Benchmarks showed this was quite beneficial. diff --git a/library/core/src/slice/sort/stable/quicksort.rs b/library/core/src/slice/sort/stable/quicksort.rs index 0c8308bfce00e..630c6ff907703 100644 --- a/library/core/src/slice/sort/stable/quicksort.rs +++ b/library/core/src/slice/sort/stable/quicksort.rs @@ -7,6 +7,8 @@ use crate::slice::sort::shared::smallsort::StableSmallSortTypeImpl; use crate::{intrinsics, ptr}; /// Sorts `v` recursively using quicksort. +/// `scratch.len()` must be at least `max(v.len() - v.len() / 2, SMALL_SORT_GENERAL_SCRATCH_LEN)` +/// otherwise the implementation may abort. /// /// `limit` when initialized with `c*log(v.len())` for some c ensures we do not /// overflow the stack or go quadratic. diff --git a/library/core/src/str/mod.rs b/library/core/src/str/mod.rs index 8a473b398bb5f..39fa6c1a25fe9 100644 --- a/library/core/src/str/mod.rs +++ b/library/core/src/str/mod.rs @@ -1108,7 +1108,8 @@ impl str { LinesAny(self.lines()) } - /// Returns an iterator of `u16` over the string encoded as UTF-16. + /// Returns an iterator of `u16` over the string encoded + /// as native endian UTF-16 (without byte-order mark). /// /// # Examples /// diff --git a/src/bootstrap/src/core/build_steps/compile.rs b/src/bootstrap/src/core/build_steps/compile.rs index f447d186a5242..cd3558ac6a49b 100644 --- a/src/bootstrap/src/core/build_steps/compile.rs +++ b/src/bootstrap/src/core/build_steps/compile.rs @@ -339,7 +339,7 @@ fn copy_self_contained_objects( // to using gcc from a glibc-targeting toolchain for linking. // To do that we have to distribute musl startup objects as a part of Rust toolchain // and link with them manually in the self-contained mode. - if target.contains("musl") && !target.contains("unikraft") { + if target.needs_crt_begin_end() { let srcdir = builder.musl_libdir(target).unwrap_or_else(|| { panic!("Target {:?} does not have a \"musl-libdir\" key", target.triple) }); diff --git a/src/bootstrap/src/core/build_steps/llvm.rs b/src/bootstrap/src/core/build_steps/llvm.rs index 3cf25373b8963..82779dc630634 100644 --- a/src/bootstrap/src/core/build_steps/llvm.rs +++ b/src/bootstrap/src/core/build_steps/llvm.rs @@ -1295,7 +1295,9 @@ impl Step for CrtBeginEnd { } fn make_run(run: RunConfig<'_>) { - run.builder.ensure(CrtBeginEnd { target: run.target }); + if run.target.needs_crt_begin_end() { + run.builder.ensure(CrtBeginEnd { target: run.target }); + } } /// Build crtbegin.o/crtend.o for musl target. diff --git a/src/bootstrap/src/core/builder/cargo.rs b/src/bootstrap/src/core/builder/cargo.rs index f6a03a386d170..2ecab262413fa 100644 --- a/src/bootstrap/src/core/builder/cargo.rs +++ b/src/bootstrap/src/core/builder/cargo.rs @@ -659,7 +659,10 @@ impl Builder<'_> { // Build proc macros both for the host and the target unless proc-macros are not // supported by the target. if target != compiler.host && cmd_kind != Kind::Check { - let error = command(self.rustc(compiler)) + let mut rustc_cmd = command(self.rustc(compiler)); + self.add_rustc_lib_path(compiler, &mut rustc_cmd); + + let error = rustc_cmd .arg("--target") .arg(target.rustc_target_arg()) .arg("--print=file-names") @@ -667,6 +670,7 @@ impl Builder<'_> { .arg("-") .run_capture(self) .stderr(); + let not_supported = error .lines() .any(|line| line.contains("unsupported crate type `proc-macro`")); diff --git a/src/bootstrap/src/core/config/config.rs b/src/bootstrap/src/core/config/config.rs index 98490118f7d62..eb1c15b84f3a1 100644 --- a/src/bootstrap/src/core/config/config.rs +++ b/src/bootstrap/src/core/config/config.rs @@ -575,6 +575,10 @@ impl TargetSelection { env::var("OSTYPE").is_ok_and(|v| v.to_lowercase().contains("cygwin")) } + pub fn needs_crt_begin_end(&self) -> bool { + self.contains("musl") && !self.contains("unikraft") + } + /// Path to the file defining the custom target, if any. pub fn filepath(&self) -> Option<&Path> { self.file.as_ref().map(Path::new) diff --git a/src/ci/github-actions/jobs.yml b/src/ci/github-actions/jobs.yml index 9af887096251c..c249d430b2782 100644 --- a/src/ci/github-actions/jobs.yml +++ b/src/ci/github-actions/jobs.yml @@ -525,8 +525,7 @@ auto: env: RUST_CONFIGURE_ARGS: --build=i686-pc-windows-gnu SCRIPT: make ci-mingw - # We are intentionally allowing an old toolchain on this builder (and that's - # incompatible with LLVM downloads today). + # There is no dist-i686-mingw-alt, so there is no prebuilt LLVM with assertions NO_DOWNLOAD_CI_LLVM: 1 <<: *job-windows-25-8c @@ -535,8 +534,7 @@ auto: env: SCRIPT: make ci-mingw-x RUST_CONFIGURE_ARGS: --build=x86_64-pc-windows-gnu - # We are intentionally allowing an old toolchain on this builder (and that's - # incompatible with LLVM downloads today). + # There is no dist-x86_64-mingw-alt, so there is no prebuilt LLVM with assertions NO_DOWNLOAD_CI_LLVM: 1 <<: *job-windows @@ -544,8 +542,7 @@ auto: env: SCRIPT: make ci-mingw-bootstrap RUST_CONFIGURE_ARGS: --build=x86_64-pc-windows-gnu - # We are intentionally allowing an old toolchain on this builder (and that's - # incompatible with LLVM downloads today). + # There is no dist-x86_64-mingw-alt, so there is no prebuilt LLVM with assertions NO_DOWNLOAD_CI_LLVM: 1 <<: *job-windows @@ -593,9 +590,6 @@ auto: RUST_CONFIGURE_ARGS: >- --build=i686-pc-windows-gnu --enable-full-tools - # We are intentionally allowing an old toolchain on this builder (and that's - # incompatible with LLVM downloads today). - NO_DOWNLOAD_CI_LLVM: 1 SCRIPT: python x.py dist bootstrap --include-default-paths DIST_REQUIRE_ALL_TOOLS: 1 CODEGEN_BACKENDS: llvm,cranelift @@ -607,9 +601,6 @@ auto: RUST_CONFIGURE_ARGS: >- --build=x86_64-pc-windows-gnu --enable-full-tools - # We are intentionally allowing an old toolchain on this builder (and that's - # incompatible with LLVM downloads today). - NO_DOWNLOAD_CI_LLVM: 1 DIST_REQUIRE_ALL_TOOLS: 1 CODEGEN_BACKENDS: llvm,cranelift <<: *job-windows diff --git a/src/doc/rustc/src/platform-support.md b/src/doc/rustc/src/platform-support.md index 8227dfa043e3a..d43b890e0d082 100644 --- a/src/doc/rustc/src/platform-support.md +++ b/src/doc/rustc/src/platform-support.md @@ -309,13 +309,13 @@ target | std | host | notes [`hexagon-unknown-none-elf`](platform-support/hexagon-unknown-none-elf.md)| * | | Bare Hexagon (v60+, HVX) [`i386-apple-ios`](platform-support/apple-ios.md) | ✓ | | 32-bit x86 iOS [^x86_32-floats-return-ABI] [`i586-pc-nto-qnx700`](platform-support/nto-qnx.md) | * | | 32-bit x86 QNX Neutrino 7.0 RTOS [^x86_32-floats-return-ABI] -[`i586-unknown-netbsd`](platform-support/netbsd.md) | ✓ | | 32-bit x86, restricted to Pentium +[`i586-unknown-netbsd`](platform-support/netbsd.md) | ✓ | | 32-bit x86, restricted to Pentium [^x86_32-floats-x87] [`i686-apple-darwin`](platform-support/apple-darwin.md) | ✓ | ✓ | 32-bit macOS (10.12+, Sierra+) [^x86_32-floats-return-ABI] -`i686-unknown-haiku` | ✓ | ✓ | 32-bit Haiku [^x86_32-floats-return-ABI] -[`i686-unknown-hurd-gnu`](platform-support/hurd.md) | ✓ | ✓ | 32-bit GNU/Hurd [^x86_32-floats-return-ABI] +`i686-unknown-haiku` | ✓ | ✓ | 32-bit Haiku with SSE [^x86_32-floats-return-ABI] +[`i686-unknown-hurd-gnu`](platform-support/hurd.md) | ✓ | ✓ | 32-bit GNU/Hurd w/o SSE [^x86_32-floats-x87] [`i686-unknown-netbsd`](platform-support/netbsd.md) | ✓ | ✓ | NetBSD/i386 with SSE2 [^x86_32-floats-return-ABI] -[`i686-unknown-openbsd`](platform-support/openbsd.md) | ✓ | ✓ | 32-bit OpenBSD [^x86_32-floats-return-ABI] -[`i686-unknown-redox`](platform-support/redox.md) | ✓ | | i686 Redox OS +[`i686-unknown-openbsd`](platform-support/openbsd.md) | ✓ | ✓ | 32-bit OpenBSD with SSE2 [^x86_32-floats-return-ABI] +[`i686-unknown-redox`](platform-support/redox.md) | ✓ | | i686 Redox OS w/o SSE [^x86_32-floats-x87] `i686-uwp-windows-gnu` | ✓ | | [^x86_32-floats-return-ABI] [`i686-uwp-windows-msvc`](platform-support/uwp-windows-msvc.md) | ✓ | | [^x86_32-floats-return-ABI] [`i686-win7-windows-gnu`](platform-support/win7-windows-gnu.md) | ✓ | | 32-bit Windows 7 support [^x86_32-floats-return-ABI] diff --git a/src/tools/compiletest/src/directive-list.rs b/src/tools/compiletest/src/directive-list.rs index 71496444660f5..a7ac875d0a36c 100644 --- a/src/tools/compiletest/src/directive-list.rs +++ b/src/tools/compiletest/src/directive-list.rs @@ -39,6 +39,10 @@ const KNOWN_DIRECTIVE_NAMES: &[&str] = &[ "ignore-android", "ignore-apple", "ignore-arm", + "ignore-arm-unknown-linux-gnueabi", + "ignore-arm-unknown-linux-gnueabihf", + "ignore-arm-unknown-linux-musleabi", + "ignore-arm-unknown-linux-musleabihf", "ignore-avr", "ignore-beta", "ignore-cdb", diff --git a/src/tools/miri/src/machine.rs b/src/tools/miri/src/machine.rs index 845ba484326f0..3727b5f4cae4a 100644 --- a/src/tools/miri/src/machine.rs +++ b/src/tools/miri/src/machine.rs @@ -11,6 +11,7 @@ use std::{fmt, process}; use rand::rngs::StdRng; use rand::{Rng, SeedableRng}; use rustc_abi::{Align, ExternAbi, Size}; +use rustc_apfloat::{Float, FloatConvert}; use rustc_attr_parsing::InlineAttr; use rustc_data_structures::fx::{FxHashMap, FxHashSet}; #[allow(unused)] @@ -1129,20 +1130,24 @@ impl<'tcx> Machine<'tcx> for MiriMachine<'tcx> { } #[inline(always)] - fn generate_nan< - F1: rustc_apfloat::Float + rustc_apfloat::FloatConvert, - F2: rustc_apfloat::Float, - >( + fn generate_nan, F2: Float>( ecx: &InterpCx<'tcx, Self>, inputs: &[F1], ) -> F2 { ecx.generate_nan(inputs) } + #[inline(always)] + fn equal_float_min_max(ecx: &MiriInterpCx<'tcx>, a: F, b: F) -> F { + ecx.equal_float_min_max(a, b) + } + + #[inline(always)] fn ub_checks(ecx: &InterpCx<'tcx, Self>) -> InterpResult<'tcx, bool> { interp_ok(ecx.tcx.sess.ub_checks()) } + #[inline(always)] fn thread_local_static_pointer( ecx: &mut MiriInterpCx<'tcx>, def_id: DefId, diff --git a/src/tools/miri/src/operator.rs b/src/tools/miri/src/operator.rs index 0017a3991b53b..43c628d66d590 100644 --- a/src/tools/miri/src/operator.rs +++ b/src/tools/miri/src/operator.rs @@ -115,4 +115,11 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> { nan } } + + fn equal_float_min_max(&self, a: F, b: F) -> F { + let this = self.eval_context_ref(); + // Return one side non-deterministically. + let mut rand = this.machine.rng.borrow_mut(); + if rand.gen() { a } else { b } + } } diff --git a/src/tools/miri/tests/pass/float.rs b/src/tools/miri/tests/pass/float.rs index 4de315e358975..2f4f64b1aa800 100644 --- a/src/tools/miri/tests/pass/float.rs +++ b/src/tools/miri/tests/pass/float.rs @@ -31,6 +31,7 @@ fn main() { test_fast(); test_algebraic(); test_fmuladd(); + test_min_max_nondet(); } trait Float: Copy + PartialEq + Debug { @@ -1211,3 +1212,30 @@ fn test_fmuladd() { test_operations_f32(0.1, 0.2, 0.3); test_operations_f64(1.1, 1.2, 1.3); } + +/// `min` and `max` on equal arguments are non-deterministic. +fn test_min_max_nondet() { + /// Ensure that if we call the closure often enough, we see both `true` and `false.` + #[track_caller] + fn ensure_both(f: impl Fn() -> bool) { + let rounds = 16; + let first = f(); + for _ in 1..rounds { + if f() != first { + // We saw two different values! + return; + } + } + // We saw the same thing N times. + panic!("expected non-determinism, got {rounds} times the same result: {first:?}"); + } + + ensure_both(|| f16::min(0.0, -0.0).is_sign_positive()); + ensure_both(|| f16::max(0.0, -0.0).is_sign_positive()); + ensure_both(|| f32::min(0.0, -0.0).is_sign_positive()); + ensure_both(|| f32::max(0.0, -0.0).is_sign_positive()); + ensure_both(|| f64::min(0.0, -0.0).is_sign_positive()); + ensure_both(|| f64::max(0.0, -0.0).is_sign_positive()); + ensure_both(|| f128::min(0.0, -0.0).is_sign_positive()); + ensure_both(|| f128::max(0.0, -0.0).is_sign_positive()); +} diff --git a/src/tools/run-make-support/src/external_deps/rustc.rs b/src/tools/run-make-support/src/external_deps/rustc.rs index b70db7130f677..8d99924a2d17c 100644 --- a/src/tools/run-make-support/src/external_deps/rustc.rs +++ b/src/tools/run-make-support/src/external_deps/rustc.rs @@ -216,6 +216,18 @@ impl Rustc { self } + /// Specify option of `-C symbol-mangling-version`. + pub fn symbol_mangling_version(&mut self, option: &str) -> &mut Self { + self.cmd.arg(format!("-Csymbol-mangling-version={option}")); + self + } + + /// Specify `-C prefer-dynamic`. + pub fn prefer_dynamic(&mut self) -> &mut Self { + self.cmd.arg(format!("-Cprefer-dynamic")); + self + } + /// Specify error format to use pub fn error_format(&mut self, format: &str) -> &mut Self { self.cmd.arg(format!("--error-format={format}")); diff --git a/src/tools/run-make-support/src/lib.rs b/src/tools/run-make-support/src/lib.rs index 7316244b3841d..a8c9bec57fde6 100644 --- a/src/tools/run-make-support/src/lib.rs +++ b/src/tools/run-make-support/src/lib.rs @@ -47,7 +47,9 @@ pub use wasmparser; // tidy-alphabetical-end // Re-exports of external dependencies. -pub use external_deps::{c_build, c_cxx_compiler, clang, htmldocck, llvm, python, rustc, rustdoc}; +pub use external_deps::{ + cargo, c_build, c_cxx_compiler, clang, htmldocck, llvm, python, rustc, rustdoc +}; // These rely on external dependencies. pub use c_cxx_compiler::{Cc, Gcc, cc, cxx, extra_c_flags, extra_cxx_flags, gcc}; @@ -79,7 +81,10 @@ pub use env::{env_var, env_var_os, set_current_dir}; pub use run::{cmd, run, run_fail, run_with_args}; /// Helpers for checking target information. -pub use targets::{is_aix, is_darwin, is_msvc, is_windows, llvm_components_contain, target, uname, apple_os}; +pub use targets::{ + apple_os, is_aix, is_darwin, is_msvc, is_windows, is_windows_gnu, llvm_components_contain, + target, uname, +}; /// Helpers for building names of output artifacts that are potentially target-specific. pub use artifact_names::{ @@ -104,4 +109,3 @@ pub use assertion_helpers::{ pub use string::{ count_regex_matches_in_files_with_extension, invalid_utf8_contains, invalid_utf8_not_contains, }; -use crate::external_deps::cargo; diff --git a/src/tools/run-make-support/src/symbols.rs b/src/tools/run-make-support/src/symbols.rs index fd0c866bcc927..e4d244e14a4a1 100644 --- a/src/tools/run-make-support/src/symbols.rs +++ b/src/tools/run-make-support/src/symbols.rs @@ -2,28 +2,44 @@ use std::path::Path; use object::{self, Object, ObjectSymbol, SymbolIterator}; -/// Iterate through the symbols in an object file. -/// -/// Uses a callback because `SymbolIterator` does not own its data. +/// Given an [`object::File`], find the exported dynamic symbol names via +/// [`object::Object::exports`]. This does not distinguish between which section the symbols appear +/// in. +#[track_caller] +pub fn exported_dynamic_symbol_names<'file>(file: &'file object::File<'file>) -> Vec<&'file str> { + file.exports() + .unwrap() + .into_iter() + .filter_map(|sym| std::str::from_utf8(sym.name()).ok()) + .collect() +} + +/// Iterate through the symbols in an object file. See [`object::Object::symbols`]. /// -/// Panics if `path` is not a valid object file readable by the current user. +/// Panics if `path` is not a valid object file readable by the current user or if `path` cannot be +/// parsed as a recognized object file. +#[track_caller] pub fn with_symbol_iter(path: P, func: F) -> R where P: AsRef, F: FnOnce(&mut SymbolIterator<'_, '_>) -> R, { - let raw_bytes = crate::fs::read(path); - let f = object::File::parse(raw_bytes.as_slice()).expect("unable to parse file"); + let path = path.as_ref(); + let blob = crate::fs::read(path); + let f = object::File::parse(&*blob) + .unwrap_or_else(|e| panic!("failed to parse `{}`: {e}", path.display())); let mut iter = f.symbols(); func(&mut iter) } /// Check an object file's symbols for substrings. /// -/// Returns `true` if any of the symbols found in the object file at -/// `path` contain a substring listed in `substrings`. +/// Returns `true` if any of the symbols found in the object file at `path` contain a substring +/// listed in `substrings`. /// -/// Panics if `path` is not a valid object file readable by the current user. +/// Panics if `path` is not a valid object file readable by the current user or if `path` cannot be +/// parsed as a recognized object file. +#[track_caller] pub fn any_symbol_contains(path: impl AsRef, substrings: &[&str]) -> bool { with_symbol_iter(path, |syms| { for sym in syms { diff --git a/src/tools/run-make-support/src/targets.rs b/src/tools/run-make-support/src/targets.rs index ae004fd0cbdd8..a16fca71d2eec 100644 --- a/src/tools/run-make-support/src/targets.rs +++ b/src/tools/run-make-support/src/targets.rs @@ -22,6 +22,12 @@ pub fn is_msvc() -> bool { target().contains("msvc") } +/// Check if target is windows-gnu. +#[must_use] +pub fn is_windows_gnu() -> bool { + target().ends_with("windows-gnu") +} + /// Check if target uses macOS. #[must_use] pub fn is_darwin() -> bool { diff --git a/src/tools/tidy/src/allowed_run_make_makefiles.txt b/src/tools/tidy/src/allowed_run_make_makefiles.txt index e75d3dc2147bc..45b40b17ea37f 100644 --- a/src/tools/tidy/src/allowed_run_make_makefiles.txt +++ b/src/tools/tidy/src/allowed_run_make_makefiles.txt @@ -1,2 +1 @@ run-make/split-debuginfo/Makefile -run-make/symbol-mangling-hashed/Makefile diff --git a/tests/codegen/issues/issue-136329-optnone-noinline.rs b/tests/codegen/issues/issue-136329-optnone-noinline.rs new file mode 100644 index 0000000000000..57c9e47a4992a --- /dev/null +++ b/tests/codegen/issues/issue-136329-optnone-noinline.rs @@ -0,0 +1,21 @@ +//! Ensure that `#[optimize(none)]` functions are never inlined + +//@ compile-flags: -Copt-level=3 + +#![feature(optimize_attribute)] + +#[optimize(none)] +pub fn foo() { + let _x = 123; +} + +// CHECK-LABEL: define{{.*}}void @bar +// CHECK: start: +// CHECK: {{.*}}call {{.*}}void +// CHECK: ret void +#[no_mangle] +pub fn bar() { + foo(); +} + +fn main() {} diff --git a/tests/crashes/135210.rs b/tests/crashes/135210.rs deleted file mode 100644 index acb61e21090d2..0000000000000 --- a/tests/crashes/135210.rs +++ /dev/null @@ -1,8 +0,0 @@ -//@ known-bug: #135210 - -#![feature(const_trait_impl)] -const _: fn(&String) = |s| { - &*s as &str; -}; - -fn main() {} diff --git a/tests/run-make/symbol-mangling-hashed/Makefile b/tests/run-make/symbol-mangling-hashed/Makefile deleted file mode 100644 index c95036ead9587..0000000000000 --- a/tests/run-make/symbol-mangling-hashed/Makefile +++ /dev/null @@ -1,48 +0,0 @@ -include ../tools.mk - -# ignore-cross-compile -# only-linux -# only-x86_64 - -NM=nm -D -RLIB_NAME=liba_rlib.rlib -DYLIB_NAME=liba_dylib.so -SO_NAME=libb_dylib.so -BIN_NAME=b_bin - -ifeq ($(UNAME),Darwin) -NM=nm -gU -RLIB_NAME=liba_rlib.rlib -DYLIB_NAME=liba_dylib.dylib -SO_NAME=libb_dylib.dylib -BIN_NAME=b_bin -endif - -ifdef IS_WINDOWS -NM=nm -g -RLIB_NAME=liba_rlib.dll.a -DYLIB_NAME=liba_dylib.dll -SO_NAME=libb_dylib.dll -BIN_NAME=b_bin.exe -endif - -all: - $(RUSTC) -C prefer-dynamic -Z unstable-options -C symbol-mangling-version=hashed -C metadata=foo a_dylib.rs - $(RUSTC) -C prefer-dynamic -Z unstable-options -C symbol-mangling-version=hashed -C metadata=bar a_rlib.rs - $(RUSTC) -C prefer-dynamic -L $(TMPDIR) b_dylib.rs - $(RUSTC) -C prefer-dynamic -L $(TMPDIR) b_bin.rs - - # Check hashed symbol name - - [ "$$($(NM) $(TMPDIR)/$(DYLIB_NAME) | grep -c hello)" -eq "0" ] - [ "$$($(NM) $(TMPDIR)/$(DYLIB_NAME) | grep _RNxC7a_dylib | grep -c ' T ')" -eq "2" ] - - [ "$$($(NM) $(TMPDIR)/$(SO_NAME) | grep b_dylib | grep -c hello)" -eq "1" ] - [ "$$($(NM) $(TMPDIR)/$(SO_NAME) | grep _RNxC6a_rlib | grep -c ' T ')" -eq "2" ] - [ "$$($(NM) $(TMPDIR)/$(SO_NAME) | grep _RNxC7a_dylib | grep -c ' U ')" -eq "1" ] - - [ "$$($(NM) $(TMPDIR)/$(BIN_NAME) | grep _RNxC6a_rlib | grep -c ' U ')" -eq "1" ] - [ "$$($(NM) $(TMPDIR)/$(BIN_NAME) | grep _RNxC7a_dylib | grep -c ' U ')" -eq "1" ] - [ "$$($(NM) $(TMPDIR)/$(BIN_NAME) | grep b_dylib | grep hello | grep -c ' U ')" -eq "1" ] - - $(call RUN,$(BIN_NAME)) diff --git a/tests/run-make/symbol-mangling-hashed/b_bin.rs b/tests/run-make/symbol-mangling-hashed/b_bin.rs deleted file mode 100644 index 8ee7fecda62a0..0000000000000 --- a/tests/run-make/symbol-mangling-hashed/b_bin.rs +++ /dev/null @@ -1,9 +0,0 @@ -extern crate a_dylib; -extern crate a_rlib; -extern crate b_dylib; - -fn main() { - a_rlib::hello(); - a_dylib::hello(); - b_dylib::hello(); -} diff --git a/tests/run-make/symbol-mangling-hashed/b_dylib.rs b/tests/run-make/symbol-mangling-hashed/b_dylib.rs deleted file mode 100644 index 3252c9c75c2a4..0000000000000 --- a/tests/run-make/symbol-mangling-hashed/b_dylib.rs +++ /dev/null @@ -1,9 +0,0 @@ -#![crate_type = "dylib"] - -extern crate a_dylib; -extern crate a_rlib; - -pub fn hello() { - a_rlib::hello(); - a_dylib::hello(); -} diff --git a/tests/run-make/symbol-mangling-hashed/default_bin.rs b/tests/run-make/symbol-mangling-hashed/default_bin.rs new file mode 100644 index 0000000000000..387596705c364 --- /dev/null +++ b/tests/run-make/symbol-mangling-hashed/default_bin.rs @@ -0,0 +1,9 @@ +extern crate default_dylib; +extern crate hashed_dylib; +extern crate hashed_rlib; + +fn main() { + hashed_rlib::hrhello(); + hashed_dylib::hdhello(); + default_dylib::ddhello(); +} diff --git a/tests/run-make/symbol-mangling-hashed/default_dylib.rs b/tests/run-make/symbol-mangling-hashed/default_dylib.rs new file mode 100644 index 0000000000000..986d1c7b74d21 --- /dev/null +++ b/tests/run-make/symbol-mangling-hashed/default_dylib.rs @@ -0,0 +1,9 @@ +#![crate_type = "dylib"] + +extern crate hashed_dylib; +extern crate hashed_rlib; + +pub fn ddhello() { + hashed_rlib::hrhello(); + hashed_dylib::hdhello(); +} diff --git a/tests/run-make/symbol-mangling-hashed/a_dylib.rs b/tests/run-make/symbol-mangling-hashed/hashed_dylib.rs similarity index 74% rename from tests/run-make/symbol-mangling-hashed/a_dylib.rs rename to tests/run-make/symbol-mangling-hashed/hashed_dylib.rs index 49d65b72cacc1..fbb7cba43e050 100644 --- a/tests/run-make/symbol-mangling-hashed/a_dylib.rs +++ b/tests/run-make/symbol-mangling-hashed/hashed_dylib.rs @@ -1,4 +1,4 @@ #![crate_type = "dylib"] -pub fn hello() { +pub fn hdhello() { println!("hello dylib"); } diff --git a/tests/run-make/symbol-mangling-hashed/a_rlib.rs b/tests/run-make/symbol-mangling-hashed/hashed_rlib.rs similarity index 74% rename from tests/run-make/symbol-mangling-hashed/a_rlib.rs rename to tests/run-make/symbol-mangling-hashed/hashed_rlib.rs index 71e44ccc20075..048e67784d23f 100644 --- a/tests/run-make/symbol-mangling-hashed/a_rlib.rs +++ b/tests/run-make/symbol-mangling-hashed/hashed_rlib.rs @@ -1,5 +1,5 @@ #![crate_type = "rlib"] -pub fn hello() { +pub fn hrhello() { println!("hello rlib"); } diff --git a/tests/run-make/symbol-mangling-hashed/rmake.rs b/tests/run-make/symbol-mangling-hashed/rmake.rs new file mode 100644 index 0000000000000..136e6b9fa3a95 --- /dev/null +++ b/tests/run-make/symbol-mangling-hashed/rmake.rs @@ -0,0 +1,108 @@ +// ignore-tidy-linelength +//! Basic smoke test for the unstable option `-C symbol_mangling_version=hashed` which aims to +//! replace full symbol mangling names based on hash digests to shorten symbol name lengths in +//! dylibs for space savings. +//! +//! # References +//! +//! - MCP #705: Provide option to shorten symbol names by replacing them with a digest: +//! . +//! - Implementation PR: . +//! - PE format: . + +//@ ignore-cross-compile + +#![deny(warnings)] + +use run_make_support::symbols::exported_dynamic_symbol_names; +use run_make_support::{bin_name, cwd, dynamic_lib_name, is_darwin, object, rfs, run, rustc}; + +macro_rules! adjust_symbol_prefix { + ($name:literal) => { + if is_darwin() { concat!("_", $name) } else { $name } + }; +} + +fn main() { + rustc() + .input("hashed_dylib.rs") + .prefer_dynamic() + .arg("-Zunstable-options") + .symbol_mangling_version("hashed") + .metadata("foo") + .run(); + + rustc() + .input("hashed_rlib.rs") + .prefer_dynamic() + .arg("-Zunstable-options") + .symbol_mangling_version("hashed") + .metadata("bar") + .run(); + + rustc().input("default_dylib.rs").library_search_path(cwd()).prefer_dynamic().run(); + rustc().input("default_bin.rs").library_search_path(cwd()).prefer_dynamic().run(); + + { + // Check hashed symbol name + + let dylib_filename = dynamic_lib_name("hashed_dylib"); + println!("checking dylib `{dylib_filename}`"); + + let dylib_blob = rfs::read(&dylib_filename); + let dylib_file = object::File::parse(&*dylib_blob) + .unwrap_or_else(|e| panic!("failed to parse `{dylib_filename}`: {e}")); + + let dynamic_symbols = exported_dynamic_symbol_names(&dylib_file); + + if dynamic_symbols.iter().filter(|sym| sym.contains("hdhello")).count() != 0 { + eprintln!("exported dynamic symbols: {:#?}", dynamic_symbols); + panic!("expected no occurrence of `hdhello`"); + } + + let expected_prefix = adjust_symbol_prefix!("_RNxC12hashed_dylib"); + if dynamic_symbols.iter().filter(|sym| sym.starts_with(expected_prefix)).count() != 2 { + eprintln!("exported dynamic symbols: {:#?}", dynamic_symbols); + panic!("expected two dynamic symbols starting with `{expected_prefix}`"); + } + } + + { + let dylib_filename = dynamic_lib_name("default_dylib"); + println!("checking so `{dylib_filename}`"); + + let dylib_blob = rfs::read(&dylib_filename); + let dylib_file = object::File::parse(&*dylib_blob) + .unwrap_or_else(|e| panic!("failed to parse `{dylib_filename}`: {e}")); + + let dynamic_symbols = exported_dynamic_symbol_names(&dylib_file); + + if dynamic_symbols + .iter() + .filter(|sym| sym.contains("default_dylib") && sym.contains("ddhello")) + .count() + != 1 + { + eprintln!("exported dynamic symbols: {:#?}", dynamic_symbols); + panic!("expected one occurrence of mangled `ddhello`"); + } + + let expected_rlib_prefix = adjust_symbol_prefix!("_RNxC11hashed_rlib"); + if dynamic_symbols.iter().filter(|sym| sym.starts_with(expected_rlib_prefix)).count() != 2 { + eprintln!("exported dynamic symbols: {:#?}", dynamic_symbols); + panic!("expected two exported symbols starting with `{expected_rlib_prefix}`"); + } + + let expected_dylib_prefix = adjust_symbol_prefix!("_RNxC12hashed_dylib"); + if dynamic_symbols.iter().any(|sym| sym.starts_with("_RNxC12hashed_dylib")) { + eprintln!("exported dynamic symbols: {:#?}", dynamic_symbols); + panic!("did not expect any symbols starting with `{expected_dylib_prefix}`"); + } + } + + // Check that the final binary can be run. + { + let bin_filename = bin_name("default_bin"); + run(&bin_filename); + } +} diff --git a/tests/ui/array-slice-vec/driftsort-off-by-one-issue-136103.rs b/tests/ui/array-slice-vec/driftsort-off-by-one-issue-136103.rs new file mode 100644 index 0000000000000..42197ff102d72 --- /dev/null +++ b/tests/ui/array-slice-vec/driftsort-off-by-one-issue-136103.rs @@ -0,0 +1,10 @@ +//@ run-pass +// Ensures that driftsort doesn't crash under specific slice +// length and memory size. +// Based on the example given in https://github.com/rust-lang/rust/issues/136103. +fn main() { + let n = 127; + let mut objs: Vec<_> = + (0..n).map(|i| [(i % 2) as u8; 125001]).collect(); + objs.sort(); +} diff --git a/tests/ui/associated-inherent-types/bugs/wf-check-skipped.next.stderr b/tests/ui/associated-inherent-types/bugs/wf-check-skipped.next.stderr index bf53089675d5b..81ace4ebb6daf 100644 --- a/tests/ui/associated-inherent-types/bugs/wf-check-skipped.next.stderr +++ b/tests/ui/associated-inherent-types/bugs/wf-check-skipped.next.stderr @@ -5,6 +5,8 @@ LL | fn main() -> Foo::Bar::> {} | ^^^^^^^^^^ doesn't have a size known at compile-time | = help: the trait `Sized` is not implemented for `[u32]` +note: required by an implicit `Sized` bound in `Vec` + --> $SRC_DIR/alloc/src/vec/mod.rs:LL:COL error: aborting due to 1 previous error diff --git a/tests/ui/const-generics/issues/issue-88119.stderr b/tests/ui/const-generics/issues/issue-88119.stderr index f219c90849a26..c497f1b6d0bdb 100644 --- a/tests/ui/const-generics/issues/issue-88119.stderr +++ b/tests/ui/const-generics/issues/issue-88119.stderr @@ -6,35 +6,29 @@ LL | #![feature(const_trait_impl, generic_const_exprs)] | = help: remove one of these features -error[E0284]: type annotations needed: cannot normalize `<&T as ConstName>::{constant#0}` - --> $DIR/issue-88119.rs:19:49 +error[E0284]: type annotations needed: cannot satisfy `the constant `name_len::()` can be evaluated` + --> $DIR/issue-88119.rs:21:5 | -LL | impl const ConstName for &T - | ^^ cannot normalize `<&T as ConstName>::{constant#0}` +LL | [(); name_len::()]:, + | ^^^^^^^^^^^^^^^^^^^^^ cannot satisfy `the constant `name_len::()` can be evaluated` | -note: required for `&T` to implement `~const ConstName` - --> $DIR/issue-88119.rs:19:35 +note: required by a bound in `<&T as ConstName>` + --> $DIR/issue-88119.rs:21:10 | -LL | impl const ConstName for &T - | ^^^^^^^^^ ^^ -LL | where LL | [(); name_len::()]:, - | --------------------- unsatisfied trait bound introduced here + | ^^^^^^^^^^^^^^^ required by this bound in `<&T as ConstName>` -error[E0284]: type annotations needed: cannot normalize `<&mut T as ConstName>::{constant#0}` - --> $DIR/issue-88119.rs:26:49 +error[E0284]: type annotations needed: cannot satisfy `the constant `name_len::()` can be evaluated` + --> $DIR/issue-88119.rs:28:5 | -LL | impl const ConstName for &mut T - | ^^^^^^ cannot normalize `<&mut T as ConstName>::{constant#0}` +LL | [(); name_len::()]:, + | ^^^^^^^^^^^^^^^^^^^^^ cannot satisfy `the constant `name_len::()` can be evaluated` | -note: required for `&mut T` to implement `~const ConstName` - --> $DIR/issue-88119.rs:26:35 +note: required by a bound in `<&mut T as ConstName>` + --> $DIR/issue-88119.rs:28:10 | -LL | impl const ConstName for &mut T - | ^^^^^^^^^ ^^^^^^ -LL | where LL | [(); name_len::()]:, - | --------------------- unsatisfied trait bound introduced here + | ^^^^^^^^^^^^^^^ required by this bound in `<&mut T as ConstName>` error: aborting due to 3 previous errors diff --git a/tests/ui/diagnostic_namespace/do_not_recommend/as_expression.next.stderr b/tests/ui/diagnostic_namespace/do_not_recommend/as_expression.next.stderr index 1b76669ccb0d7..4f685c508c721 100644 --- a/tests/ui/diagnostic_namespace/do_not_recommend/as_expression.next.stderr +++ b/tests/ui/diagnostic_namespace/do_not_recommend/as_expression.next.stderr @@ -16,23 +16,13 @@ LL | where LL | T: AsExpression, | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `Foo::check` -error[E0277]: the trait bound `&str: AsExpression` is not satisfied - --> $DIR/as_expression.rs:55:15 - | -LL | SelectInt.check("bar"); - | ^^^^^ the trait `AsExpression` is not implemented for `&str` - | - = help: the trait `AsExpression` is not implemented for `&str` - but trait `AsExpression` is implemented for it - = help: for that trait implementation, expected `Text`, found `Integer` - error[E0271]: type mismatch resolving `::SqlType == Text` --> $DIR/as_expression.rs:55:5 | LL | SelectInt.check("bar"); | ^^^^^^^^^^^^^^^^^^^^^^ expected `Text`, found `Integer` -error: aborting due to 3 previous errors +error: aborting due to 2 previous errors Some errors have detailed explanations: E0271, E0277. For more information about an error, try `rustc --explain E0271`. diff --git a/tests/ui/diagnostic_namespace/do_not_recommend/as_expression.rs b/tests/ui/diagnostic_namespace/do_not_recommend/as_expression.rs index 583b3c4675a87..48c1ed2b02d71 100644 --- a/tests/ui/diagnostic_namespace/do_not_recommend/as_expression.rs +++ b/tests/ui/diagnostic_namespace/do_not_recommend/as_expression.rs @@ -53,7 +53,7 @@ impl Foo for T where T: Expression {} fn main() { SelectInt.check("bar"); - //~^ ERROR the trait bound `&str: AsExpression` is not satisfied - //[next]~| the trait bound `&str: AsExpression<::SqlType>` is not satisfied + //[current]~^ ERROR the trait bound `&str: AsExpression` is not satisfied + //[next]~^^ the trait bound `&str: AsExpression<::SqlType>` is not satisfied //[next]~| type mismatch } diff --git a/tests/ui/impl-trait/in-trait/alias-bounds-when-not-wf.stderr b/tests/ui/impl-trait/in-trait/alias-bounds-when-not-wf.stderr index 1cfc2a6d94495..a95670ced8678 100644 --- a/tests/ui/impl-trait/in-trait/alias-bounds-when-not-wf.stderr +++ b/tests/ui/impl-trait/in-trait/alias-bounds-when-not-wf.stderr @@ -18,6 +18,11 @@ help: this trait has no implementations, consider adding one | LL | trait Foo {} | ^^^^^^^^^ +note: required by a bound in `A` + --> $DIR/alias-bounds-when-not-wf.rs:8:11 + | +LL | type A = T; + | ^^^ required by this bound in `A` error[E0277]: the trait bound `usize: Foo` is not satisfied --> $DIR/alias-bounds-when-not-wf.rs:16:10 diff --git a/tests/ui/liveness/liveness-unused.rs b/tests/ui/liveness/liveness-unused.rs index ba635e6638c8c..49e7044aeda1f 100644 --- a/tests/ui/liveness/liveness-unused.rs +++ b/tests/ui/liveness/liveness-unused.rs @@ -2,6 +2,7 @@ #![deny(unused_variables)] #![deny(unused_assignments)] #![allow(dead_code, non_camel_case_types, trivial_numeric_casts, dropping_copy_types)] +#![feature(intrinsics)] use std::ops::AddAssign; @@ -137,5 +138,10 @@ fn f7() { drop(a); } +// unused params warnings are not needed for intrinsic functions without bodies +#[rustc_intrinsic] +unsafe fn simd_shuffle(a: T, b: T, i: I) -> U; + + fn main() { } diff --git a/tests/ui/liveness/liveness-unused.stderr b/tests/ui/liveness/liveness-unused.stderr index f6c478ddbc72c..a69fc10dff271 100644 --- a/tests/ui/liveness/liveness-unused.stderr +++ b/tests/ui/liveness/liveness-unused.stderr @@ -1,5 +1,5 @@ warning: unreachable statement - --> $DIR/liveness-unused.rs:92:9 + --> $DIR/liveness-unused.rs:93:9 | LL | continue; | -------- any code following this expression is unreachable @@ -14,7 +14,7 @@ LL | #![warn(unused)] = note: `#[warn(unreachable_code)]` implied by `#[warn(unused)]` error: unused variable: `x` - --> $DIR/liveness-unused.rs:8:7 + --> $DIR/liveness-unused.rs:9:7 | LL | fn f1(x: isize) { | ^ help: if this is intentional, prefix it with an underscore: `_x` @@ -26,25 +26,25 @@ LL | #![deny(unused_variables)] | ^^^^^^^^^^^^^^^^ error: unused variable: `x` - --> $DIR/liveness-unused.rs:12:8 + --> $DIR/liveness-unused.rs:13:8 | LL | fn f1b(x: &mut isize) { | ^ help: if this is intentional, prefix it with an underscore: `_x` error: unused variable: `x` - --> $DIR/liveness-unused.rs:20:9 + --> $DIR/liveness-unused.rs:21:9 | LL | let x: isize; | ^ help: if this is intentional, prefix it with an underscore: `_x` error: unused variable: `x` - --> $DIR/liveness-unused.rs:25:9 + --> $DIR/liveness-unused.rs:26:9 | LL | let x = 3; | ^ help: if this is intentional, prefix it with an underscore: `_x` error: variable `x` is assigned to, but never used - --> $DIR/liveness-unused.rs:30:13 + --> $DIR/liveness-unused.rs:31:13 | LL | let mut x = 3; | ^ @@ -52,7 +52,7 @@ LL | let mut x = 3; = note: consider using `_x` instead error: value assigned to `x` is never read - --> $DIR/liveness-unused.rs:32:5 + --> $DIR/liveness-unused.rs:33:5 | LL | x += 4; | ^ @@ -65,7 +65,7 @@ LL | #![deny(unused_assignments)] | ^^^^^^^^^^^^^^^^^^ error: variable `z` is assigned to, but never used - --> $DIR/liveness-unused.rs:37:13 + --> $DIR/liveness-unused.rs:38:13 | LL | let mut z = 3; | ^ @@ -73,31 +73,31 @@ LL | let mut z = 3; = note: consider using `_z` instead error: unused variable: `i` - --> $DIR/liveness-unused.rs:59:12 + --> $DIR/liveness-unused.rs:60:12 | LL | Some(i) => { | ^ help: if this is intentional, prefix it with an underscore: `_i` error: unused variable: `x` - --> $DIR/liveness-unused.rs:79:9 + --> $DIR/liveness-unused.rs:80:9 | LL | for x in 1..10 { } | ^ help: if this is intentional, prefix it with an underscore: `_x` error: unused variable: `x` - --> $DIR/liveness-unused.rs:84:10 + --> $DIR/liveness-unused.rs:85:10 | LL | for (x, _) in [1, 2, 3].iter().enumerate() { } | ^ help: if this is intentional, prefix it with an underscore: `_x` error: unused variable: `x` - --> $DIR/liveness-unused.rs:89:13 + --> $DIR/liveness-unused.rs:90:13 | LL | for (_, x) in [1, 2, 3].iter().enumerate() { | ^ help: if this is intentional, prefix it with an underscore: `_x` error: variable `x` is assigned to, but never used - --> $DIR/liveness-unused.rs:112:9 + --> $DIR/liveness-unused.rs:113:9 | LL | let x; | ^ @@ -105,7 +105,7 @@ LL | let x; = note: consider using `_x` instead error: value assigned to `x` is never read - --> $DIR/liveness-unused.rs:116:9 + --> $DIR/liveness-unused.rs:117:9 | LL | x = 0; | ^ diff --git a/tests/ui/target-feature/forbidden-hardfloat-target-feature-attribute.rs b/tests/ui/target-feature/forbidden-hardfloat-target-feature-attribute.rs index dab01179c0b36..215e64979f736 100644 --- a/tests/ui/target-feature/forbidden-hardfloat-target-feature-attribute.rs +++ b/tests/ui/target-feature/forbidden-hardfloat-target-feature-attribute.rs @@ -1,3 +1,4 @@ +//! Ensure ABI-incompatible features cannot be enabled via `#[target_feature]`. //@ compile-flags: --target=riscv32e-unknown-none-elf --crate-type=lib //@ needs-llvm-components: riscv #![feature(no_core, lang_items, riscv_target_feature)] diff --git a/tests/ui/target-feature/forbidden-hardfloat-target-feature-attribute.stderr b/tests/ui/target-feature/forbidden-hardfloat-target-feature-attribute.stderr index 9df56d86729c1..bfe767e5ffb07 100644 --- a/tests/ui/target-feature/forbidden-hardfloat-target-feature-attribute.stderr +++ b/tests/ui/target-feature/forbidden-hardfloat-target-feature-attribute.stderr @@ -1,5 +1,5 @@ error: target feature `d` cannot be enabled with `#[target_feature]`: this feature is incompatible with the target ABI - --> $DIR/forbidden-hardfloat-target-feature-attribute.rs:9:18 + --> $DIR/forbidden-hardfloat-target-feature-attribute.rs:10:18 | LL | #[target_feature(enable = "d")] | ^^^^^^^^^^^^ diff --git a/tests/ui/target-feature/forbidden-hardfloat-target-feature-cfg.rs b/tests/ui/target-feature/forbidden-hardfloat-target-feature-cfg.rs deleted file mode 100644 index 8755791c1c04b..0000000000000 --- a/tests/ui/target-feature/forbidden-hardfloat-target-feature-cfg.rs +++ /dev/null @@ -1,14 +0,0 @@ -//@ compile-flags: --target=x86_64-unknown-linux-gnu --crate-type=lib -//@ needs-llvm-components: x86 -//@ check-pass -#![feature(no_core, lang_items)] -#![no_core] -#![allow(unexpected_cfgs)] - -#[lang = "sized"] -pub trait Sized {} - -// The compile_error macro does not exist, so if the `cfg` evaluates to `true` this -// complains about the missing macro rather than showing the error... but that's good enough. -#[cfg(not(target_feature = "x87"))] -compile_error!("the x87 feature *should* be exposed in `cfg`"); diff --git a/tests/ui/target-feature/forbidden-hardfloat-target-feature-flag-disable-implied.rs b/tests/ui/target-feature/forbidden-hardfloat-target-feature-flag-disable-implied.rs index 3d09217327ab9..81f138b175f29 100644 --- a/tests/ui/target-feature/forbidden-hardfloat-target-feature-flag-disable-implied.rs +++ b/tests/ui/target-feature/forbidden-hardfloat-target-feature-flag-disable-implied.rs @@ -1,8 +1,11 @@ +//! Ensure that if disabling a target feature implies disabling an ABI-required target feature, +//! we complain. //@ compile-flags: --target=x86_64-unknown-linux-gnu --crate-type=lib //@ needs-llvm-components: x86 //@ compile-flags: -Ctarget-feature=-sse // For now this is just a warning. //@ build-pass +//@error-pattern: must be enabled to ensure that the ABI #![feature(no_core, lang_items)] #![no_core] diff --git a/tests/ui/target-feature/forbidden-hardfloat-target-feature-flag-disable-neon.rs b/tests/ui/target-feature/forbidden-hardfloat-target-feature-flag-disable-neon.rs index 95c366bb3f5be..7242bcc85bfd1 100644 --- a/tests/ui/target-feature/forbidden-hardfloat-target-feature-flag-disable-neon.rs +++ b/tests/ui/target-feature/forbidden-hardfloat-target-feature-flag-disable-neon.rs @@ -3,6 +3,7 @@ //@ compile-flags: -Ctarget-feature=-neon // For now this is just a warning. //@ build-pass +//@error-pattern: must be enabled to ensure that the ABI #![feature(no_core, lang_items)] #![no_core] diff --git a/tests/ui/target-feature/forbidden-hardfloat-target-feature-flag-disable.rs b/tests/ui/target-feature/forbidden-hardfloat-target-feature-flag-disable.rs index fd8023664dad8..7eebcf05dc0f4 100644 --- a/tests/ui/target-feature/forbidden-hardfloat-target-feature-flag-disable.rs +++ b/tests/ui/target-feature/forbidden-hardfloat-target-feature-flag-disable.rs @@ -1,8 +1,10 @@ +//! Ensure ABI-required features cannot be disabled via `-Ctarget-feature`. //@ compile-flags: --target=x86_64-unknown-linux-gnu --crate-type=lib //@ needs-llvm-components: x86 //@ compile-flags: -Ctarget-feature=-x87 // For now this is just a warning. //@ build-pass +//@error-pattern: must be enabled to ensure that the ABI #![feature(no_core, lang_items)] #![no_core] diff --git a/tests/ui/target-feature/forbidden-hardfloat-target-feature-flag.rs b/tests/ui/target-feature/forbidden-hardfloat-target-feature-flag.rs new file mode 100644 index 0000000000000..f277a309cd698 --- /dev/null +++ b/tests/ui/target-feature/forbidden-hardfloat-target-feature-flag.rs @@ -0,0 +1,12 @@ +//! Ensure ABI-incompatible features cannot be enabled via `-Ctarget-feature`. +//@ compile-flags: --target=x86_64-unknown-linux-gnu --crate-type=lib +//@ needs-llvm-components: x86 +//@ compile-flags: -Ctarget-feature=+soft-float +// For now this is just a warning. +//@ build-pass +//@error-pattern: must be disabled to ensure that the ABI +#![feature(no_core, lang_items, riscv_target_feature)] +#![no_core] + +#[lang = "sized"] +pub trait Sized {} diff --git a/tests/ui/target-feature/forbidden-hardfloat-target-feature-flag.stderr b/tests/ui/target-feature/forbidden-hardfloat-target-feature-flag.stderr new file mode 100644 index 0000000000000..e49672f33b9a8 --- /dev/null +++ b/tests/ui/target-feature/forbidden-hardfloat-target-feature-flag.stderr @@ -0,0 +1,11 @@ +warning: target feature `soft-float` must be disabled to ensure that the ABI of the current target can be implemented correctly + | + = note: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! + = note: for more information, see issue #116344 + +warning: unstable feature specified for `-Ctarget-feature`: `soft-float` + | + = note: this feature is not stably supported; its behavior can change in the future + +warning: 2 warnings emitted + diff --git a/tests/ui/target-feature/forbidden-target-feature-attribute.rs b/tests/ui/target-feature/forbidden-target-feature-attribute.rs index 2ba5f2215c7b2..6bb6f8aaffb6f 100644 --- a/tests/ui/target-feature/forbidden-target-feature-attribute.rs +++ b/tests/ui/target-feature/forbidden-target-feature-attribute.rs @@ -1,11 +1,12 @@ -//@ compile-flags: --target=x86_64-unknown-linux-gnu --crate-type=lib -//@ needs-llvm-components: x86 +//! Ensure "forbidden" target features cannot be enabled via `#[target_feature]`. +//@ compile-flags: --target=riscv32e-unknown-none-elf --crate-type=lib +//@ needs-llvm-components: riscv #![feature(no_core, lang_items)] #![no_core] #[lang = "sized"] pub trait Sized {} -#[target_feature(enable = "soft-float")] +#[target_feature(enable = "forced-atomics")] //~^ERROR: cannot be enabled with pub unsafe fn my_fun() {} diff --git a/tests/ui/target-feature/forbidden-target-feature-attribute.stderr b/tests/ui/target-feature/forbidden-target-feature-attribute.stderr index f3d54cc19d3e9..f8ea0c0e793fb 100644 --- a/tests/ui/target-feature/forbidden-target-feature-attribute.stderr +++ b/tests/ui/target-feature/forbidden-target-feature-attribute.stderr @@ -1,8 +1,8 @@ -error: target feature `soft-float` cannot be enabled with `#[target_feature]`: unsound because it changes float ABI - --> $DIR/forbidden-target-feature-attribute.rs:9:18 +error: target feature `forced-atomics` cannot be enabled with `#[target_feature]`: unsound because it changes the ABI of atomic operations + --> $DIR/forbidden-target-feature-attribute.rs:10:18 | -LL | #[target_feature(enable = "soft-float")] - | ^^^^^^^^^^^^^^^^^^^^^ +LL | #[target_feature(enable = "forced-atomics")] + | ^^^^^^^^^^^^^^^^^^^^^^^^^ error: aborting due to 1 previous error diff --git a/tests/ui/target-feature/forbidden-target-feature-cfg.rs b/tests/ui/target-feature/forbidden-target-feature-cfg.rs index 1f001e9f8ff8a..e848ffde018e2 100644 --- a/tests/ui/target-feature/forbidden-target-feature-cfg.rs +++ b/tests/ui/target-feature/forbidden-target-feature-cfg.rs @@ -1,5 +1,6 @@ -//@ compile-flags: --target=x86_64-unknown-none --crate-type=lib -//@ needs-llvm-components: x86 +//! Ensure "forbidden" target features are not exposed via `cfg`. +//@ compile-flags: --target=riscv32e-unknown-none-elf --crate-type=lib +//@ needs-llvm-components: riscv //@ check-pass #![feature(no_core, lang_items)] #![no_core] @@ -10,5 +11,5 @@ pub trait Sized {} // The compile_error macro does not exist, so if the `cfg` evaluates to `true` this // complains about the missing macro rather than showing the error... but that's good enough. -#[cfg(target_feature = "soft-float")] -compile_error!("the soft-float feature should not be exposed in `cfg`"); +#[cfg(target_feature = "forced-atomics")] +compile_error!("the forced-atomics feature should not be exposed in `cfg`"); diff --git a/tests/ui/target-feature/forbidden-target-feature-flag-disable.rs b/tests/ui/target-feature/forbidden-target-feature-flag-disable.rs index b09c53bd46afa..cf85c5212289c 100644 --- a/tests/ui/target-feature/forbidden-target-feature-flag-disable.rs +++ b/tests/ui/target-feature/forbidden-target-feature-flag-disable.rs @@ -1,8 +1,10 @@ -//@ compile-flags: --target=x86_64-unknown-linux-gnu --crate-type=lib -//@ needs-llvm-components: x86 -//@ compile-flags: -Ctarget-feature=-soft-float +//! Ensure "forbidden" target features cannot be disabled via `-Ctarget-feature`. +//@ compile-flags: --target=riscv32e-unknown-none-elf --crate-type=lib +//@ needs-llvm-components: riscv +//@ compile-flags: -Ctarget-feature=-forced-atomics // For now this is just a warning. //@ build-pass +//@error-pattern: unsound because it changes the ABI #![feature(no_core, lang_items)] #![no_core] diff --git a/tests/ui/target-feature/forbidden-target-feature-flag-disable.stderr b/tests/ui/target-feature/forbidden-target-feature-flag-disable.stderr index 797cd4be5c27f..171ed0de6aaf3 100644 --- a/tests/ui/target-feature/forbidden-target-feature-flag-disable.stderr +++ b/tests/ui/target-feature/forbidden-target-feature-flag-disable.stderr @@ -1,4 +1,4 @@ -warning: target feature `soft-float` cannot be disabled with `-Ctarget-feature`: unsound because it changes float ABI +warning: target feature `forced-atomics` cannot be disabled with `-Ctarget-feature`: unsound because it changes the ABI of atomic operations | = note: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! = note: for more information, see issue #116344 diff --git a/tests/ui/target-feature/forbidden-target-feature-flag.rs b/tests/ui/target-feature/forbidden-target-feature-flag.rs index 0f688fde7f434..245841eb0395c 100644 --- a/tests/ui/target-feature/forbidden-target-feature-flag.rs +++ b/tests/ui/target-feature/forbidden-target-feature-flag.rs @@ -1,8 +1,10 @@ -//@ compile-flags: --target=x86_64-unknown-linux-gnu --crate-type=lib -//@ needs-llvm-components: x86 -//@ compile-flags: -Ctarget-feature=+soft-float +//! Ensure "forbidden" target features cannot be enabled via `-Ctarget-feature`. +//@ compile-flags: --target=riscv32e-unknown-none-elf --crate-type=lib +//@ needs-llvm-components: riscv +//@ compile-flags: -Ctarget-feature=+forced-atomics // For now this is just a warning. //@ build-pass +//@error-pattern: unsound because it changes the ABI #![feature(no_core, lang_items)] #![no_core] diff --git a/tests/ui/target-feature/forbidden-target-feature-flag.stderr b/tests/ui/target-feature/forbidden-target-feature-flag.stderr index 075666fbf6682..f8490f066d1d7 100644 --- a/tests/ui/target-feature/forbidden-target-feature-flag.stderr +++ b/tests/ui/target-feature/forbidden-target-feature-flag.stderr @@ -1,4 +1,4 @@ -warning: target feature `soft-float` cannot be enabled with `-Ctarget-feature`: unsound because it changes float ABI +warning: target feature `forced-atomics` cannot be enabled with `-Ctarget-feature`: unsound because it changes the ABI of atomic operations | = note: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! = note: for more information, see issue #116344 diff --git a/tests/ui/traits/const-traits/enforce-deref-on-adjust.rs b/tests/ui/traits/const-traits/enforce-deref-on-adjust.rs new file mode 100644 index 0000000000000..d5240b7e18ddb --- /dev/null +++ b/tests/ui/traits/const-traits/enforce-deref-on-adjust.rs @@ -0,0 +1,28 @@ +//@ check-pass + +#![feature(const_deref)] +#![feature(const_trait_impl)] + +use std::ops::Deref; + +struct Wrap(T); +struct Foo; + +impl Foo { + const fn call(&self) {} +} + +impl const Deref for Wrap { + type Target = T; + + fn deref(&self) -> &Self::Target { + &self.0 + } +} + +const fn foo() { + let x = Wrap(Foo); + x.call(); +} + +fn main() {} diff --git a/tests/ui/traits/next-solver/canonical/const-region-infer-to-static-in-binder.stderr b/tests/ui/traits/next-solver/canonical/const-region-infer-to-static-in-binder.stderr index 377dfc8b52916..425f2d59222e0 100644 --- a/tests/ui/traits/next-solver/canonical/const-region-infer-to-static-in-binder.stderr +++ b/tests/ui/traits/next-solver/canonical/const-region-infer-to-static-in-binder.stderr @@ -1,8 +1,8 @@ -error[E0284]: type annotations needed: cannot normalize `X::{constant#0}` +error[E0284]: type annotations needed: cannot satisfy `the constant `{ || {} }` can be evaluated` --> $DIR/const-region-infer-to-static-in-binder.rs:4:10 | LL | struct X; - | ^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot normalize `X::{constant#0}` + | ^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot satisfy `the constant `{ || {} }` can be evaluated` error: using function pointers as const generic parameters is forbidden --> $DIR/const-region-infer-to-static-in-binder.rs:4:20 diff --git a/tests/ui/traits/next-solver/specialization-transmute.stderr b/tests/ui/traits/next-solver/specialization-transmute.stderr index b96bfab927d2d..2d0c503bc958d 100644 --- a/tests/ui/traits/next-solver/specialization-transmute.stderr +++ b/tests/ui/traits/next-solver/specialization-transmute.stderr @@ -10,11 +10,11 @@ LL | #![feature(specialization)] error: cannot normalize `::Id: '_` -error[E0284]: type annotations needed: cannot normalize `::Id` +error[E0282]: type annotations needed --> $DIR/specialization-transmute.rs:15:23 | LL | fn intu(&self) -> &Self::Id { - | ^^^^^^^^^ cannot normalize `::Id` + | ^^^^^^^^^ cannot infer type for reference `&::Id` error[E0284]: type annotations needed: cannot satisfy `::Id normalizes-to T` --> $DIR/specialization-transmute.rs:17:9 @@ -36,4 +36,5 @@ LL | fn transmute, U: Copy>(t: T) -> U { error: aborting due to 4 previous errors; 1 warning emitted -For more information about this error, try `rustc --explain E0284`. +Some errors have detailed explanations: E0282, E0284. +For more information about an error, try `rustc --explain E0282`. diff --git a/tests/ui/typeck/issue-114918/const-in-impl-fn-return-type.next.stderr b/tests/ui/typeck/issue-114918/const-in-impl-fn-return-type.next.stderr index 1bcc0dbaf6726..92ad83c330000 100644 --- a/tests/ui/typeck/issue-114918/const-in-impl-fn-return-type.next.stderr +++ b/tests/ui/typeck/issue-114918/const-in-impl-fn-return-type.next.stderr @@ -9,6 +9,8 @@ error: the constant `N` is not of type `usize` | LL | fn func() -> [(); N]; | ^^^^^^^ expected `usize`, found `u32` + | + = note: the length of array `[(); N]` must be type `usize` error: aborting due to 2 previous errors diff --git a/tests/ui/union/union-derive-eq.next.stderr b/tests/ui/union/union-derive-eq.next.stderr index 3952b1f12840f..151ceebe1ba67 100644 --- a/tests/ui/union/union-derive-eq.next.stderr +++ b/tests/ui/union/union-derive-eq.next.stderr @@ -7,6 +7,8 @@ LL | union U2 { LL | a: PartialEqNotEq, | ^^^^^^^^^^^^^^^^^ the trait `Eq` is not implemented for `PartialEqNotEq` | +note: required by a bound in `AssertParamIsEq` + --> $SRC_DIR/core/src/cmp.rs:LL:COL = note: this error originates in the derive macro `Eq` (in Nightly builds, run with -Z macro-backtrace for more info) help: consider annotating `PartialEqNotEq` with `#[derive(Eq)]` | diff --git a/tests/ui/wf/wf-normalization-sized.next.stderr b/tests/ui/wf/wf-normalization-sized.next.stderr index 1e898fb7b78ab..83b56bb6b19ad 100644 --- a/tests/ui/wf/wf-normalization-sized.next.stderr +++ b/tests/ui/wf/wf-normalization-sized.next.stderr @@ -5,6 +5,7 @@ LL | const _: <[[[[[[u8]]]]]] as WellUnformed>::RequestNormalize = (); | ^^^^^^^^^^^^^^ doesn't have a size known at compile-time | = help: the trait `Sized` is not implemented for `[[[[[u8]]]]]` + = note: slice and array elements must have `Sized` type error[E0277]: the size for values of type `[[[[[u8]]]]]` cannot be known at compilation time --> $DIR/wf-normalization-sized.rs:19:11 @@ -13,6 +14,7 @@ LL | const _: <[[[[[[u8]]]]]] as WellUnformed>::RequestNormalize = (); | ^^^^^^^^^^^^^^ doesn't have a size known at compile-time | = help: the trait `Sized` is not implemented for `[[[[[u8]]]]]` + = note: slice and array elements must have `Sized` type = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no` error[E0277]: the size for values of type `str` cannot be known at compilation time @@ -22,6 +24,8 @@ LL | const _: as WellUnformed>::RequestNormalize = (); | ^^^^^^^^ doesn't have a size known at compile-time | = help: the trait `Sized` is not implemented for `str` +note: required by an implicit `Sized` bound in `Vec` + --> $SRC_DIR/alloc/src/vec/mod.rs:LL:COL error[E0277]: the size for values of type `str` cannot be known at compilation time --> $DIR/wf-normalization-sized.rs:22:11 @@ -30,6 +34,8 @@ LL | const _: as WellUnformed>::RequestNormalize = (); | ^^^^^^^^ doesn't have a size known at compile-time | = help: the trait `Sized` is not implemented for `str` +note: required by an implicit `Sized` bound in `Vec` + --> $SRC_DIR/alloc/src/vec/mod.rs:LL:COL = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no` error: aborting due to 4 previous errors diff --git a/tests/ui/wf/wf-trait-fn-arg.next.stderr b/tests/ui/wf/wf-trait-fn-arg.next.stderr index c55dc5c8a121a..d5dd36fad6dd6 100644 --- a/tests/ui/wf/wf-trait-fn-arg.next.stderr +++ b/tests/ui/wf/wf-trait-fn-arg.next.stderr @@ -4,6 +4,11 @@ error[E0277]: the trait bound `Self: Eq` is not satisfied LL | fn bar(&self, x: &Bar); | ^^^^^^^^^ the trait `Eq` is not implemented for `Self` | +note: required by a bound in `Bar` + --> $DIR/wf-trait-fn-arg.rs:11:15 + | +LL | struct Bar { + | ^^ required by this bound in `Bar` help: consider further restricting `Self` | LL | fn bar(&self, x: &Bar) where Self: Eq; diff --git a/tests/ui/wf/wf-trait-fn-ret.next.stderr b/tests/ui/wf/wf-trait-fn-ret.next.stderr index b3dca17672d31..0ad786c2fd566 100644 --- a/tests/ui/wf/wf-trait-fn-ret.next.stderr +++ b/tests/ui/wf/wf-trait-fn-ret.next.stderr @@ -4,6 +4,11 @@ error[E0277]: the trait bound `Self: Eq` is not satisfied LL | fn bar(&self) -> &Bar; | ^^^^^^^^^ the trait `Eq` is not implemented for `Self` | +note: required by a bound in `Bar` + --> $DIR/wf-trait-fn-ret.rs:10:15 + | +LL | struct Bar { + | ^^ required by this bound in `Bar` help: consider further restricting `Self` | LL | fn bar(&self) -> &Bar where Self: Eq; diff --git a/tests/ui/wf/wf-trait-fn-where-clause.next.stderr b/tests/ui/wf/wf-trait-fn-where-clause.next.stderr index 8c8a5fa3e7041..db5454d0f3c22 100644 --- a/tests/ui/wf/wf-trait-fn-where-clause.next.stderr +++ b/tests/ui/wf/wf-trait-fn-where-clause.next.stderr @@ -4,6 +4,11 @@ error[E0277]: the trait bound `Self: Eq` is not satisfied LL | Bar: Copy; | ^^^^ the trait `Eq` is not implemented for `Self` | +note: required by a bound in `Bar` + --> $DIR/wf-trait-fn-where-clause.rs:10:15 + | +LL | struct Bar { + | ^^ required by this bound in `Bar` help: consider further restricting `Self` | LL | Bar: Copy, Self: Eq;