diff options
Diffstat (limited to 'compiler')
| -rw-r--r-- | compiler/rustc_borrowck/src/diagnostics/region_errors.rs | 1 | ||||
| -rw-r--r-- | compiler/rustc_borrowck/src/type_check/mod.rs | 13 | ||||
| -rw-r--r-- | compiler/rustc_middle/src/mir/mod.rs | 3 | ||||
| -rw-r--r-- | compiler/rustc_middle/src/mir/query.rs | 8 | ||||
| -rw-r--r-- | compiler/rustc_mir_build/src/build/expr/as_operand.rs | 17 | ||||
| -rw-r--r-- | compiler/rustc_mir_build/src/build/expr/as_rvalue.rs | 24 | ||||
| -rw-r--r-- | compiler/rustc_mir_build/src/build/expr/into.rs | 11 |
7 files changed, 56 insertions, 21 deletions
diff --git a/compiler/rustc_borrowck/src/diagnostics/region_errors.rs b/compiler/rustc_borrowck/src/diagnostics/region_errors.rs index 57d2a3c5ce9..0761d63c665 100644 --- a/compiler/rustc_borrowck/src/diagnostics/region_errors.rs +++ b/compiler/rustc_borrowck/src/diagnostics/region_errors.rs @@ -40,6 +40,7 @@ impl ConstraintDescription for ConstraintCategory { ConstraintCategory::CopyBound => "copying this value ", ConstraintCategory::OpaqueType => "opaque type ", ConstraintCategory::ClosureUpvar(_) => "closure capture ", + ConstraintCategory::Usage => "this usage ", ConstraintCategory::Boring | ConstraintCategory::BoringNoLocation | ConstraintCategory::Internal => "", diff --git a/compiler/rustc_borrowck/src/type_check/mod.rs b/compiler/rustc_borrowck/src/type_check/mod.rs index 41c004ea596..5ccf3806025 100644 --- a/compiler/rustc_borrowck/src/type_check/mod.rs +++ b/compiler/rustc_borrowck/src/type_check/mod.rs @@ -1388,11 +1388,24 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> { ConstraintCategory::Return(ReturnConstraint::Normal) } } + Some(l) + if matches!( + body.local_decls[l].local_info, + Some(box LocalInfo::AggregateTemp) + ) => + { + ConstraintCategory::Usage + } Some(l) if !body.local_decls[l].is_user_variable() => { ConstraintCategory::Boring } _ => ConstraintCategory::Assignment, }; + debug!( + "assignment category: {:?} {:?}", + category, + place.as_local().map(|l| &body.local_decls[l]) + ); let place_ty = place.ty(body, tcx).ty; let place_ty = self.normalize(place_ty, location); diff --git a/compiler/rustc_middle/src/mir/mod.rs b/compiler/rustc_middle/src/mir/mod.rs index e8d30034dc4..3e9c02ee268 100644 --- a/compiler/rustc_middle/src/mir/mod.rs +++ b/compiler/rustc_middle/src/mir/mod.rs @@ -992,6 +992,9 @@ pub enum LocalInfo<'tcx> { StaticRef { def_id: DefId, is_thread_local: bool }, /// A temporary created that references the const with the given `DefId` ConstRef { def_id: DefId }, + /// A temporary created during the creation of an aggregate + /// (e.g. a temporary for `foo` in `MyStruct { my_field: foo }`) + AggregateTemp, } impl<'tcx> LocalDecl<'tcx> { diff --git a/compiler/rustc_middle/src/mir/query.rs b/compiler/rustc_middle/src/mir/query.rs index 567f65e83d9..b003a504691 100644 --- a/compiler/rustc_middle/src/mir/query.rs +++ b/compiler/rustc_middle/src/mir/query.rs @@ -332,17 +332,15 @@ pub enum ConstraintCategory { CopyBound, SizedBound, Assignment, + /// A constraint that came from a usage of a variable (e.g. in an ADT expression + /// like `Foo { field: my_val }`) + Usage, OpaqueType, ClosureUpvar(hir::HirId), /// A "boring" constraint (caused by the given location) is one that /// the user probably doesn't want to see described in diagnostics, /// because it is kind of an artifact of the type system setup. - /// Example: `x = Foo { field: y }` technically creates - /// intermediate regions representing the "type of `Foo { field: y - /// }`", and data flows from `y` into those variables, but they - /// are not very interesting. The assignment into `x` on the other - /// hand might be. Boring, // Boring and applicable everywhere. BoringNoLocation, diff --git a/compiler/rustc_mir_build/src/build/expr/as_operand.rs b/compiler/rustc_mir_build/src/build/expr/as_operand.rs index bbb2f89fda9..b627b0763a2 100644 --- a/compiler/rustc_mir_build/src/build/expr/as_operand.rs +++ b/compiler/rustc_mir_build/src/build/expr/as_operand.rs @@ -20,7 +20,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> { expr: &Expr<'tcx>, ) -> BlockAnd<Operand<'tcx>> { let local_scope = self.local_scope(); - self.as_operand(block, Some(local_scope), expr) + self.as_operand(block, Some(local_scope), expr, None) } /// Returns an operand suitable for use until the end of the current scope expression and @@ -85,6 +85,11 @@ impl<'a, 'tcx> Builder<'a, 'tcx> { /// temporary `tmp = x`, so that we capture the value of `x` at /// this time. /// + /// If we end up needing to create a temporary, then we will use + /// `local_info` as its `LocalInfo`, unless `as_temporary` + /// has already assigned it a non-`None` `LocalInfo`. + /// Normally, you should use `None` for `local_info` + /// /// The operand is known to be live until the end of `scope`. /// /// Like `as_local_call_operand`, except that the argument will @@ -94,15 +99,16 @@ impl<'a, 'tcx> Builder<'a, 'tcx> { mut block: BasicBlock, scope: Option<region::Scope>, expr: &Expr<'tcx>, + local_info: Option<Box<LocalInfo<'tcx>>>, ) -> BlockAnd<Operand<'tcx>> { - debug!("as_operand(block={:?}, expr={:?})", block, expr); + debug!("as_operand(block={:?}, expr={:?} local_info={:?})", block, expr, local_info); let this = self; if let ExprKind::Scope { region_scope, lint_level, value } = expr.kind { let source_info = this.source_info(expr.span); let region_scope = (region_scope, source_info); return this.in_scope(region_scope, lint_level, |this| { - this.as_operand(block, scope, &this.thir[value]) + this.as_operand(block, scope, &this.thir[value], local_info) }); } @@ -115,6 +121,9 @@ impl<'a, 'tcx> Builder<'a, 'tcx> { } Category::Place | Category::Rvalue(..) => { let operand = unpack!(block = this.as_temp(block, scope, expr, Mutability::Mut)); + if this.local_decls[operand].local_info.is_none() { + this.local_decls[operand].local_info = local_info; + } block.and(Operand::Move(Place::from(operand))) } } @@ -167,6 +176,6 @@ impl<'a, 'tcx> Builder<'a, 'tcx> { } } - this.as_operand(block, scope, expr) + this.as_operand(block, scope, expr, None) } } diff --git a/compiler/rustc_mir_build/src/build/expr/as_rvalue.rs b/compiler/rustc_mir_build/src/build/expr/as_rvalue.rs index be0d5d2f1b2..4b40faaf195 100644 --- a/compiler/rustc_mir_build/src/build/expr/as_rvalue.rs +++ b/compiler/rustc_mir_build/src/build/expr/as_rvalue.rs @@ -52,16 +52,16 @@ impl<'a, 'tcx> Builder<'a, 'tcx> { } ExprKind::Repeat { value, count } => { let value_operand = - unpack!(block = this.as_operand(block, scope, &this.thir[value])); + unpack!(block = this.as_operand(block, scope, &this.thir[value], None)); block.and(Rvalue::Repeat(value_operand, count)) } ExprKind::Binary { op, lhs, rhs } => { - let lhs = unpack!(block = this.as_operand(block, scope, &this.thir[lhs])); - let rhs = unpack!(block = this.as_operand(block, scope, &this.thir[rhs])); + let lhs = unpack!(block = this.as_operand(block, scope, &this.thir[lhs], None)); + let rhs = unpack!(block = this.as_operand(block, scope, &this.thir[rhs], None)); this.build_binary_op(block, op, expr_span, expr.ty, lhs, rhs) } ExprKind::Unary { op, arg } => { - let arg = unpack!(block = this.as_operand(block, scope, &this.thir[arg])); + let arg = unpack!(block = this.as_operand(block, scope, &this.thir[arg], None)); // Check for -MIN on signed integers if this.check_overflow && op == UnOp::Neg && expr.ty.is_signed() { let bool_ty = this.tcx.types.bool; @@ -116,11 +116,13 @@ impl<'a, 'tcx> Builder<'a, 'tcx> { block.and(Rvalue::Use(Operand::Move(Place::from(result)))) } ExprKind::Cast { source } => { - let source = unpack!(block = this.as_operand(block, scope, &this.thir[source])); + let source = + unpack!(block = this.as_operand(block, scope, &this.thir[source], None)); block.and(Rvalue::Cast(CastKind::Misc, source, expr.ty)) } ExprKind::Pointer { cast, source } => { - let source = unpack!(block = this.as_operand(block, scope, &this.thir[source])); + let source = + unpack!(block = this.as_operand(block, scope, &this.thir[source], None)); block.and(Rvalue::Cast(CastKind::Pointer(cast), source, expr.ty)) } ExprKind::Array { ref fields } => { @@ -155,7 +157,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> { let fields: Vec<_> = fields .into_iter() .copied() - .map(|f| unpack!(block = this.as_operand(block, scope, &this.thir[f]))) + .map(|f| unpack!(block = this.as_operand(block, scope, &this.thir[f], None))) .collect(); block.and(Rvalue::Aggregate(Box::new(AggregateKind::Array(el_ty)), fields)) @@ -166,7 +168,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> { let fields: Vec<_> = fields .into_iter() .copied() - .map(|f| unpack!(block = this.as_operand(block, scope, &this.thir[f]))) + .map(|f| unpack!(block = this.as_operand(block, scope, &this.thir[f], None))) .collect(); block.and(Rvalue::Aggregate(Box::new(AggregateKind::Tuple), fields)) @@ -242,7 +244,9 @@ impl<'a, 'tcx> Builder<'a, 'tcx> { &this.thir[arg], ) ), - _ => unpack!(block = this.as_operand(block, scope, upvar)), + _ => { + unpack!(block = this.as_operand(block, scope, upvar, None)) + } } } } @@ -304,7 +308,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> { Category::of(&expr.kind), Some(Category::Rvalue(RvalueFunc::AsRvalue)) )); - let operand = unpack!(block = this.as_operand(block, scope, expr)); + let operand = unpack!(block = this.as_operand(block, scope, expr, None)); block.and(Rvalue::Use(operand)) } } diff --git a/compiler/rustc_mir_build/src/build/expr/into.rs b/compiler/rustc_mir_build/src/build/expr/into.rs index e30e758e637..1803a18441c 100644 --- a/compiler/rustc_mir_build/src/build/expr/into.rs +++ b/compiler/rustc_mir_build/src/build/expr/into.rs @@ -326,10 +326,16 @@ impl<'a, 'tcx> Builder<'a, 'tcx> { let fields_map: FxHashMap<_, _> = fields .into_iter() .map(|f| { + let local_info = Box::new(LocalInfo::AggregateTemp); ( f.name, unpack!( - block = this.as_operand(block, Some(scope), &this.thir[f.expr]) + block = this.as_operand( + block, + Some(scope), + &this.thir[f.expr], + Some(local_info) + ) ), ) }) @@ -508,7 +514,8 @@ impl<'a, 'tcx> Builder<'a, 'tcx> { ExprKind::Yield { value } => { let scope = this.local_scope(); - let value = unpack!(block = this.as_operand(block, Some(scope), &this.thir[value])); + let value = + unpack!(block = this.as_operand(block, Some(scope), &this.thir[value], None)); let resume = this.cfg.start_new_block(); this.cfg.terminate( block, |