From cd4706413fb891ffe33ef06e0c229d97258fbfaf Mon Sep 17 00:00:00 2001 From: Eduardo Broto Date: Sun, 27 Sep 2020 15:17:13 +0200 Subject: [PATCH] Run cargo dev fmt --- clippy_lints/src/missing_const_for_fn.rs | 2 +- clippy_lints/src/utils/mod.rs | 2 +- .../src/utils/qualify_min_const_fn.rs | 183 +++++++----------- 3 files changed, 71 insertions(+), 116 deletions(-) diff --git a/clippy_lints/src/missing_const_for_fn.rs b/clippy_lints/src/missing_const_for_fn.rs index e5f7cc51111..3e786da28df 100644 --- a/clippy_lints/src/missing_const_for_fn.rs +++ b/clippy_lints/src/missing_const_for_fn.rs @@ -1,10 +1,10 @@ +use crate::utils::qualify_min_const_fn::is_min_const_fn; use crate::utils::{fn_has_unsatisfiable_preds, has_drop, is_entrypoint_fn, span_lint, trait_ref_of_method}; use rustc_hir as hir; use rustc_hir::intravisit::FnKind; use rustc_hir::{Body, Constness, FnDecl, GenericParamKind, HirId}; use rustc_lint::{LateContext, LateLintPass}; use rustc_middle::lint::in_external_macro; -use crate::utils::qualify_min_const_fn::is_min_const_fn; use rustc_session::{declare_lint_pass, declare_tool_lint}; use rustc_span::Span; use rustc_typeck::hir_ty_to_ty; diff --git a/clippy_lints/src/utils/mod.rs b/clippy_lints/src/utils/mod.rs index f59ed6df1a9..dfe2aadffc0 100644 --- a/clippy_lints/src/utils/mod.rs +++ b/clippy_lints/src/utils/mod.rs @@ -18,9 +18,9 @@ pub mod numeric_literal; pub mod paths; pub mod ptr; +pub mod qualify_min_const_fn; pub mod sugg; pub mod usage; -pub mod qualify_min_const_fn; pub use self::attrs::*; pub use self::diagnostics::*; diff --git a/clippy_lints/src/utils/qualify_min_const_fn.rs b/clippy_lints/src/utils/qualify_min_const_fn.rs index 6809b1fa88d..c1684575930 100644 --- a/clippy_lints/src/utils/qualify_min_const_fn.rs +++ b/clippy_lints/src/utils/qualify_min_const_fn.rs @@ -3,7 +3,7 @@ use rustc_middle::mir::*; use rustc_middle::ty::subst::GenericArgKind; use rustc_middle::ty::{self, adjustment::PointerCast, Ty, TyCtxt}; -use rustc_span::symbol::{sym}; +use rustc_span::symbol::sym; use rustc_span::Span; use rustc_target::spec::abi::Abi::RustIntrinsic; use std::borrow::Cow; @@ -23,15 +23,9 @@ pub fn is_min_const_fn(tcx: TyCtxt<'tcx>, def_id: DefId, body: &'a Body<'tcx>) - | ty::PredicateAtom::ConstEvaluatable(..) | ty::PredicateAtom::ConstEquate(..) | ty::PredicateAtom::TypeWellFormedFromEnv(..) => continue, - ty::PredicateAtom::ObjectSafe(_) => { - panic!("object safe predicate on function: {:#?}", predicate) - } - ty::PredicateAtom::ClosureKind(..) => { - panic!("closure kind predicate on function: {:#?}", predicate) - } - ty::PredicateAtom::Subtype(_) => { - panic!("subtype predicate on function: {:#?}", predicate) - } + ty::PredicateAtom::ObjectSafe(_) => panic!("object safe predicate on function: {:#?}", predicate), + ty::PredicateAtom::ClosureKind(..) => panic!("closure kind predicate on function: {:#?}", predicate), + ty::PredicateAtom::Subtype(_) => panic!("subtype predicate on function: {:#?}", predicate), ty::PredicateAtom::Trait(pred, _) => { if Some(pred.def_id()) == tcx.lang_items().sized_trait() { continue; @@ -47,12 +41,12 @@ pub fn is_min_const_fn(tcx: TyCtxt<'tcx>, def_id: DefId, body: &'a Body<'tcx>) - on const fn parameters are unstable" .into(), )); - } + }, // other kinds of bounds are either tautologies // or cause errors in other passes _ => continue, } - } + }, } } match predicates.parent { @@ -92,24 +86,23 @@ fn check_ty(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>, span: Span) -> McfResult { match ty.kind() { ty::Ref(_, _, hir::Mutability::Mut) => { - return Err((span, "mutable references in const fn are unstable".into())); - } + return Err((span, "mutable references in const fn are unstable".into())); + }, ty::Opaque(..) => return Err((span, "`impl Trait` in const fn is unstable".into())), ty::FnPtr(..) => { - return Err((span, "function pointers in const fn are unstable".into())); - } + return Err((span, "function pointers in const fn are unstable".into())); + }, ty::Dynamic(preds, _) => { for pred in preds.iter() { match pred.skip_binder() { - ty::ExistentialPredicate::AutoTrait(_) - | ty::ExistentialPredicate::Projection(_) => { + ty::ExistentialPredicate::AutoTrait(_) | ty::ExistentialPredicate::Projection(_) => { return Err(( span, "trait bounds other than `Sized` \ on const fn parameters are unstable" .into(), )); - } + }, ty::ExistentialPredicate::Trait(trait_ref) => { if Some(trait_ref.def_id) != tcx.lang_items().sized_trait() { return Err(( @@ -119,34 +112,23 @@ fn check_ty(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>, span: Span) -> McfResult { .into(), )); } - } + }, } } - } - _ => {} + }, + _ => {}, } } Ok(()) } -fn check_rvalue( - tcx: TyCtxt<'tcx>, - body: &Body<'tcx>, - def_id: DefId, - rvalue: &Rvalue<'tcx>, - span: Span, -) -> McfResult { +fn check_rvalue(tcx: TyCtxt<'tcx>, body: &Body<'tcx>, def_id: DefId, rvalue: &Rvalue<'tcx>, span: Span) -> McfResult { match rvalue { - Rvalue::ThreadLocalRef(_) => { - Err((span, "cannot access thread local storage in const fn".into())) - } - Rvalue::Repeat(operand, _) | Rvalue::Use(operand) => { - check_operand(tcx, operand, span, body) - } - Rvalue::Len(place) - | Rvalue::Discriminant(place) - | Rvalue::Ref(_, _, place) - | Rvalue::AddressOf(_, place) => check_place(tcx, *place, span, body), + Rvalue::ThreadLocalRef(_) => Err((span, "cannot access thread local storage in const fn".into())), + Rvalue::Repeat(operand, _) | Rvalue::Use(operand) => check_operand(tcx, operand, span, body), + Rvalue::Len(place) | Rvalue::Discriminant(place) | Rvalue::Ref(_, _, place) | Rvalue::AddressOf(_, place) => { + check_place(tcx, *place, span, body) + }, Rvalue::Cast(CastKind::Misc, operand, cast_ty) => { use rustc_middle::ty::cast::CastTy; let cast_in = CastTy::from_ty(operand.ty(body, tcx)).expect("bad input type for cast"); @@ -154,20 +136,16 @@ fn check_rvalue( match (cast_in, cast_out) { (CastTy::Ptr(_) | CastTy::FnPtr, CastTy::Int(_)) => { Err((span, "casting pointers to ints is unstable in const fn".into())) - } + }, _ => check_operand(tcx, operand, span, body), } - } - Rvalue::Cast( - CastKind::Pointer(PointerCast::MutToConstPointer | PointerCast::ArrayToPointer), - operand, - _, - ) => check_operand(tcx, operand, span, body), + }, + Rvalue::Cast(CastKind::Pointer(PointerCast::MutToConstPointer | PointerCast::ArrayToPointer), operand, _) => { + check_operand(tcx, operand, span, body) + }, Rvalue::Cast( CastKind::Pointer( - PointerCast::UnsafeFnPointer - | PointerCast::ClosureFnPointer(_) - | PointerCast::ReifyFnPointer, + PointerCast::UnsafeFnPointer | PointerCast::ClosureFnPointer(_) | PointerCast::ReifyFnPointer, ), _, _, @@ -177,10 +155,7 @@ fn check_rvalue( deref_ty.ty } else { // We cannot allow this for now. - return Err(( - span, - "unsizing casts are only allowed for references right now".into(), - )); + return Err((span, "unsizing casts are only allowed for references right now".into())); }; let unsized_ty = tcx.struct_tail_erasing_lifetimes(pointee_ty, tcx.param_env(def_id)); if let ty::Slice(_) | ty::Str = unsized_ty.kind() { @@ -191,7 +166,7 @@ fn check_rvalue( // We just can't allow trait objects until we have figured out trait method calls. Err((span, "unsizing casts are not allowed in const fn".into())) } - } + }, // binops are fine on integers Rvalue::BinaryOp(_, lhs, rhs) | Rvalue::CheckedBinaryOp(_, lhs, rhs) => { check_operand(tcx, lhs, span, body)?; @@ -200,13 +175,14 @@ fn check_rvalue( if ty.is_integral() || ty.is_bool() || ty.is_char() { Ok(()) } else { - Err((span, "only int, `bool` and `char` operations are stable in const fn".into())) + Err(( + span, + "only int, `bool` and `char` operations are stable in const fn".into(), + )) } - } + }, Rvalue::NullaryOp(NullOp::SizeOf, _) => Ok(()), - Rvalue::NullaryOp(NullOp::Box, _) => { - Err((span, "heap allocations are not allowed in const fn".into())) - } + Rvalue::NullaryOp(NullOp::Box, _) => Err((span, "heap allocations are not allowed in const fn".into())), Rvalue::UnaryOp(_, operand) => { let ty = operand.ty(body, tcx); if ty.is_integral() || ty.is_bool() { @@ -214,39 +190,30 @@ fn check_rvalue( } else { Err((span, "only int and `bool` operations are stable in const fn".into())) } - } + }, Rvalue::Aggregate(_, operands) => { for operand in operands { check_operand(tcx, operand, span, body)?; } Ok(()) - } + }, } } -fn check_statement( - tcx: TyCtxt<'tcx>, - body: &Body<'tcx>, - def_id: DefId, - statement: &Statement<'tcx>, -) -> McfResult { +fn check_statement(tcx: TyCtxt<'tcx>, body: &Body<'tcx>, def_id: DefId, statement: &Statement<'tcx>) -> McfResult { let span = statement.source_info.span; match &statement.kind { StatementKind::Assign(box (place, rval)) => { - check_place(tcx, *place, span, body)?; + check_place(tcx, *place, span, body)?; check_rvalue(tcx, body, def_id, rval, span) - } + }, StatementKind::FakeRead(_, place) => check_place(tcx, **place, span, body), // just an assignment - StatementKind::SetDiscriminant { place, .. } => { - check_place(tcx, **place, span, body) - } + StatementKind::SetDiscriminant { place, .. } => check_place(tcx, **place, span, body), - StatementKind::LlvmInlineAsm { .. } => { - Err((span, "cannot use inline assembly in const fn".into())) - } + StatementKind::LlvmInlineAsm { .. } => Err((span, "cannot use inline assembly in const fn".into())), // These are all NOPs StatementKind::StorageLive(_) @@ -258,12 +225,7 @@ fn check_statement( } } -fn check_operand( - tcx: TyCtxt<'tcx>, - operand: &Operand<'tcx>, - span: Span, - body: &Body<'tcx>, -) -> McfResult { +fn check_operand(tcx: TyCtxt<'tcx>, operand: &Operand<'tcx>, span: Span, body: &Body<'tcx>) -> McfResult { match operand { Operand::Move(place) | Operand::Copy(place) => check_place(tcx, *place, span, body), Operand::Constant(c) => match c.check_static_ptr(tcx) { @@ -273,12 +235,7 @@ fn check_operand( } } -fn check_place( - tcx: TyCtxt<'tcx>, - place: Place<'tcx>, - span: Span, - body: &Body<'tcx>, -) -> McfResult { +fn check_place(tcx: TyCtxt<'tcx>, place: Place<'tcx>, span: Span, body: &Body<'tcx>) -> McfResult { let mut cursor = place.projection.as_ref(); while let &[ref proj_base @ .., elem] = cursor { cursor = proj_base; @@ -288,26 +245,22 @@ fn check_place( if let Some(def) = base_ty.ty_adt_def() { // No union field accesses in `const fn` if def.is_union() { - return Err((span, "accessing union fields is unstable".into())); + return Err((span, "accessing union fields is unstable".into())); } } - } + }, ProjectionElem::ConstantIndex { .. } | ProjectionElem::Downcast(..) | ProjectionElem::Subslice { .. } | ProjectionElem::Deref - | ProjectionElem::Index(_) => {} + | ProjectionElem::Index(_) => {}, } } Ok(()) } -fn check_terminator( - tcx: TyCtxt<'tcx>, - body: &'a Body<'tcx>, - terminator: &Terminator<'tcx>, -) -> McfResult { +fn check_terminator(tcx: TyCtxt<'tcx>, body: &'a Body<'tcx>, terminator: &Terminator<'tcx>) -> McfResult { let span = terminator.source_info.span; match &terminator.kind { TerminatorKind::FalseEdge { .. } @@ -317,20 +270,23 @@ fn check_terminator( | TerminatorKind::Resume | TerminatorKind::Unreachable => Ok(()), - TerminatorKind::Drop { place, .. } => check_place(tcx, *place, span, body), + TerminatorKind::Drop { place, .. } => check_place(tcx, *place, span, body), TerminatorKind::DropAndReplace { place, value, .. } => { - check_place(tcx, *place, span, body)?; + check_place(tcx, *place, span, body)?; check_operand(tcx, value, span, body) - } + }, - TerminatorKind::SwitchInt { discr, switch_ty: _, values: _, targets: _ } => { - check_operand(tcx, discr, span, body) - } + TerminatorKind::SwitchInt { + discr, + switch_ty: _, + values: _, + targets: _, + } => check_operand(tcx, discr, span, body), TerminatorKind::Abort => Err((span, "abort is not stable in const fn".into())), TerminatorKind::GeneratorDrop | TerminatorKind::Yield { .. } => { Err((span, "const fn generators are unstable".into())) - } + }, TerminatorKind::Call { func, @@ -342,8 +298,7 @@ fn check_terminator( } => { let fn_ty = func.ty(body, tcx); if let ty::FnDef(fn_def_id, _) = *fn_ty.kind() { - if !rustc_mir::const_eval::is_min_const_fn(tcx, fn_def_id) - { + if !rustc_mir::const_eval::is_min_const_fn(tcx, fn_def_id) { return Err(( span, format!( @@ -359,9 +314,7 @@ fn check_terminator( // within const fns. `transmute` is allowed in all other const contexts. // This won't really scale to more intrinsics or functions. Let's allow const // transmutes in const fn before we add more hacks to this. - if tcx.fn_sig(fn_def_id).abi() == RustIntrinsic - && tcx.item_name(fn_def_id) == sym::transmute - { + if tcx.fn_sig(fn_def_id).abi() == RustIntrinsic && tcx.item_name(fn_def_id) == sym::transmute { return Err(( span, "can only call `transmute` from const items, not `const fn`".into(), @@ -377,14 +330,16 @@ fn check_terminator( } else { Err((span, "can only call other const fns within const fn".into())) } - } + }, - TerminatorKind::Assert { cond, expected: _, msg: _, target: _, cleanup: _ } => { - check_operand(tcx, cond, span, body) - } + TerminatorKind::Assert { + cond, + expected: _, + msg: _, + target: _, + cleanup: _, + } => check_operand(tcx, cond, span, body), - TerminatorKind::InlineAsm { .. } => { - Err((span, "cannot use inline assembly in const fn".into())) - } + TerminatorKind::InlineAsm { .. } => Err((span, "cannot use inline assembly in const fn".into())), } } -- 2.44.0