compiler/rustc_middle/src/mir/type_foldable.rs

   1 //! `TypeFoldable` implementations for MIR types
   2
   3 use super::*;
   4 use crate::ty;
   5 use rustc_data_structures::functor::IdFunctor;
   6
   7 TrivialTypeFoldableAndLiftImpls! {
   8     BlockTailInfo,
   9     MirPhase,
  10     SourceInfo,
  11     FakeReadCause,
  12     RetagKind,
  13     SourceScope,
  14     SourceScopeLocalData,
  15     UserTypeAnnotationIndex,
  16 }
  17
  18 impl<'tcx> TypeFoldable<'tcx> for Terminator<'tcx> {
  19     fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
  20         use crate::mir::TerminatorKind::*;
  21
  22         let kind = match self.kind {
  23             Goto { target } => Goto { target },
  24             SwitchInt { discr, switch_ty, targets } => SwitchInt {
  25                 discr: discr.fold_with(folder),
  26                 switch_ty: switch_ty.fold_with(folder),
  27                 targets,
  28             },
  29             Drop { place, target, unwind } => {
  30                 Drop { place: place.fold_with(folder), target, unwind }
  31             }
  32             DropAndReplace { place, value, target, unwind } => DropAndReplace {
  33                 place: place.fold_with(folder),
  34                 value: value.fold_with(folder),
  35                 target,
  36                 unwind,
  37             },
  38             Yield { value, resume, resume_arg, drop } => Yield {
  39                 value: value.fold_with(folder),
  40                 resume,
  41                 resume_arg: resume_arg.fold_with(folder),
  42                 drop,
  43             },
  44             Call { func, args, destination, cleanup, from_hir_call, fn_span } => {
  45                 let dest = destination.map(|(loc, dest)| (loc.fold_with(folder), dest));
  46
  47                 Call {
  48                     func: func.fold_with(folder),
  49                     args: args.fold_with(folder),
  50                     destination: dest,
  51                     cleanup,
  52                     from_hir_call,
  53                     fn_span,
  54                 }
  55             }
  56             Assert { cond, expected, msg, target, cleanup } => {
  57                 use AssertKind::*;
  58                 let msg = match msg {
  59                     BoundsCheck { len, index } => {
  60                         BoundsCheck { len: len.fold_with(folder), index: index.fold_with(folder) }
  61                     }
  62                     Overflow(op, l, r) => Overflow(op, l.fold_with(folder), r.fold_with(folder)),
  63                     OverflowNeg(op) => OverflowNeg(op.fold_with(folder)),
  64                     DivisionByZero(op) => DivisionByZero(op.fold_with(folder)),
  65                     RemainderByZero(op) => RemainderByZero(op.fold_with(folder)),
  66                     ResumedAfterReturn(_) | ResumedAfterPanic(_) => msg,
  67                 };
  68                 Assert { cond: cond.fold_with(folder), expected, msg, target, cleanup }
  69             }
  70             GeneratorDrop => GeneratorDrop,
  71             Resume => Resume,
  72             Abort => Abort,
  73             Return => Return,
  74             Unreachable => Unreachable,
  75             FalseEdge { real_target, imaginary_target } => {
  76                 FalseEdge { real_target, imaginary_target }
  77             }
  78             FalseUnwind { real_target, unwind } => FalseUnwind { real_target, unwind },
  79             InlineAsm { template, operands, options, line_spans, destination } => InlineAsm {
  80                 template,
  81                 operands: operands.fold_with(folder),
  82                 options,
  83                 line_spans,
  84                 destination,
  85             },
  86         };
  87         Terminator { source_info: self.source_info, kind }
  88     }
  89
  90     fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
  91         use crate::mir::TerminatorKind::*;
  92
  93         match self.kind {
  94             SwitchInt { ref discr, switch_ty, .. } => {
  95                 discr.visit_with(visitor)?;
  96                 switch_ty.visit_with(visitor)
  97             }
  98             Drop { ref place, .. } => place.visit_with(visitor),
  99             DropAndReplace { ref place, ref value, .. } => {
 100                 place.visit_with(visitor)?;
 101                 value.visit_with(visitor)
 102             }
 103             Yield { ref value, .. } => value.visit_with(visitor),
 104             Call { ref func, ref args, ref destination, .. } => {
 105                 if let Some((ref loc, _)) = *destination {
 106                     loc.visit_with(visitor)?;
 107                 };
 108                 func.visit_with(visitor)?;
 109                 args.visit_with(visitor)
 110             }
 111             Assert { ref cond, ref msg, .. } => {
 112                 cond.visit_with(visitor)?;
 113                 use AssertKind::*;
 114                 match msg {
 115                     BoundsCheck { ref len, ref index } => {
 116                         len.visit_with(visitor)?;
 117                         index.visit_with(visitor)
 118                     }
 119                     Overflow(_, l, r) => {
 120                         l.visit_with(visitor)?;
 121                         r.visit_with(visitor)
 122                     }
 123                     OverflowNeg(op) | DivisionByZero(op) | RemainderByZero(op) => {
 124                         op.visit_with(visitor)
 125                     }
 126                     ResumedAfterReturn(_) | ResumedAfterPanic(_) => ControlFlow::CONTINUE,
 127                 }
 128             }
 129             InlineAsm { ref operands, .. } => operands.visit_with(visitor),
 130             Goto { .. }
 131             | Resume
 132             | Abort
 133             | Return
 134             | GeneratorDrop
 135             | Unreachable
 136             | FalseEdge { .. }
 137             | FalseUnwind { .. } => ControlFlow::CONTINUE,
 138         }
 139     }
 140 }
 141
 142 impl<'tcx> TypeFoldable<'tcx> for GeneratorKind {
 143     fn super_fold_with<F: TypeFolder<'tcx>>(self, _: &mut F) -> Self {
 144         self
 145     }
 146
 147     fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _: &mut V) -> ControlFlow<V::BreakTy> {
 148         ControlFlow::CONTINUE
 149     }
 150 }
 151
 152 impl<'tcx> TypeFoldable<'tcx> for Place<'tcx> {
 153     fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
 154         Place { local: self.local.fold_with(folder), projection: self.projection.fold_with(folder) }
 155     }
 156
 157     fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
 158         self.local.visit_with(visitor)?;
 159         self.projection.visit_with(visitor)
 160     }
 161 }
 162
 163 impl<'tcx> TypeFoldable<'tcx> for &'tcx ty::List<PlaceElem<'tcx>> {
 164     fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
 165         ty::util::fold_list(self, folder, |tcx, v| tcx.intern_place_elems(v))
 166     }
 167
 168     fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
 169         self.iter().try_for_each(|t| t.visit_with(visitor))
 170     }
 171 }
 172
 173 impl<'tcx> TypeFoldable<'tcx> for Rvalue<'tcx> {
 174     fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
 175         use crate::mir::Rvalue::*;
 176         match self {
 177             Use(op) => Use(op.fold_with(folder)),
 178             Repeat(op, len) => Repeat(op.fold_with(folder), len.fold_with(folder)),
 179             ThreadLocalRef(did) => ThreadLocalRef(did.fold_with(folder)),
 180             Ref(region, bk, place) => Ref(region.fold_with(folder), bk, place.fold_with(folder)),
 181             AddressOf(mutability, place) => AddressOf(mutability, place.fold_with(folder)),
 182             Len(place) => Len(place.fold_with(folder)),
 183             Cast(kind, op, ty) => Cast(kind, op.fold_with(folder), ty.fold_with(folder)),
 184             BinaryOp(op, box (rhs, lhs)) => {
 185                 BinaryOp(op, Box::new((rhs.fold_with(folder), lhs.fold_with(folder))))
 186             }
 187             CheckedBinaryOp(op, box (rhs, lhs)) => {
 188                 CheckedBinaryOp(op, Box::new((rhs.fold_with(folder), lhs.fold_with(folder))))
 189             }
 190             UnaryOp(op, val) => UnaryOp(op, val.fold_with(folder)),
 191             Discriminant(place) => Discriminant(place.fold_with(folder)),
 192             NullaryOp(op, ty) => NullaryOp(op, ty.fold_with(folder)),
 193             Aggregate(kind, fields) => {
 194                 let kind = kind.map_id(|kind| match kind {
 195                     AggregateKind::Array(ty) => AggregateKind::Array(ty.fold_with(folder)),
 196                     AggregateKind::Tuple => AggregateKind::Tuple,
 197                     AggregateKind::Adt(def, v, substs, user_ty, n) => AggregateKind::Adt(
 198                         def,
 199                         v,
 200                         substs.fold_with(folder),
 201                         user_ty.fold_with(folder),
 202                         n,
 203                     ),
 204                     AggregateKind::Closure(id, substs) => {
 205                         AggregateKind::Closure(id, substs.fold_with(folder))
 206                     }
 207                     AggregateKind::Generator(id, substs, movablity) => {
 208                         AggregateKind::Generator(id, substs.fold_with(folder), movablity)
 209                     }
 210                 });
 211                 Aggregate(kind, fields.fold_with(folder))
 212             }
 213         }
 214     }
 215
 216     fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
 217         use crate::mir::Rvalue::*;
 218         match *self {
 219             Use(ref op) => op.visit_with(visitor),
 220             Repeat(ref op, _) => op.visit_with(visitor),
 221             ThreadLocalRef(did) => did.visit_with(visitor),
 222             Ref(region, _, ref place) => {
 223                 region.visit_with(visitor)?;
 224                 place.visit_with(visitor)
 225             }
 226             AddressOf(_, ref place) => place.visit_with(visitor),
 227             Len(ref place) => place.visit_with(visitor),
 228             Cast(_, ref op, ty) => {
 229                 op.visit_with(visitor)?;
 230                 ty.visit_with(visitor)
 231             }
 232             BinaryOp(_, box (ref rhs, ref lhs)) | CheckedBinaryOp(_, box (ref rhs, ref lhs)) => {
 233                 rhs.visit_with(visitor)?;
 234                 lhs.visit_with(visitor)
 235             }
 236             UnaryOp(_, ref val) => val.visit_with(visitor),
 237             Discriminant(ref place) => place.visit_with(visitor),
 238             NullaryOp(_, ty) => ty.visit_with(visitor),
 239             Aggregate(ref kind, ref fields) => {
 240                 match **kind {
 241                     AggregateKind::Array(ty) => {
 242                         ty.visit_with(visitor)?;
 243                     }
 244                     AggregateKind::Tuple => {}
 245                     AggregateKind::Adt(_, _, substs, user_ty, _) => {
 246                         substs.visit_with(visitor)?;
 247                         user_ty.visit_with(visitor)?;
 248                     }
 249                     AggregateKind::Closure(_, substs) => {
 250                         substs.visit_with(visitor)?;
 251                     }
 252                     AggregateKind::Generator(_, substs, _) => {
 253                         substs.visit_with(visitor)?;
 254                     }
 255                 }
 256                 fields.visit_with(visitor)
 257             }
 258         }
 259     }
 260 }
 261
 262 impl<'tcx> TypeFoldable<'tcx> for Operand<'tcx> {
 263     fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
 264         match self {
 265             Operand::Copy(place) => Operand::Copy(place.fold_with(folder)),
 266             Operand::Move(place) => Operand::Move(place.fold_with(folder)),
 267             Operand::Constant(c) => Operand::Constant(c.fold_with(folder)),
 268         }
 269     }
 270
 271     fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
 272         match *self {
 273             Operand::Copy(ref place) | Operand::Move(ref place) => place.visit_with(visitor),
 274             Operand::Constant(ref c) => c.visit_with(visitor),
 275         }
 276     }
 277 }
 278
 279 impl<'tcx> TypeFoldable<'tcx> for PlaceElem<'tcx> {
 280     fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
 281         use crate::mir::ProjectionElem::*;
 282
 283         match self {
 284             Deref => Deref,
 285             Field(f, ty) => Field(f, ty.fold_with(folder)),
 286             Index(v) => Index(v.fold_with(folder)),
 287             Downcast(symbol, variantidx) => Downcast(symbol, variantidx),
 288             ConstantIndex { offset, min_length, from_end } => {
 289                 ConstantIndex { offset, min_length, from_end }
 290             }
 291             Subslice { from, to, from_end } => Subslice { from, to, from_end },
 292         }
 293     }
 294
 295     fn super_visit_with<Vs: TypeVisitor<'tcx>>(
 296         &self,
 297         visitor: &mut Vs,
 298     ) -> ControlFlow<Vs::BreakTy> {
 299         use crate::mir::ProjectionElem::*;
 300
 301         match self {
 302             Field(_, ty) => ty.visit_with(visitor),
 303             Index(v) => v.visit_with(visitor),
 304             _ => ControlFlow::CONTINUE,
 305         }
 306     }
 307 }
 308
 309 impl<'tcx> TypeFoldable<'tcx> for Field {
 310     fn super_fold_with<F: TypeFolder<'tcx>>(self, _: &mut F) -> Self {
 311         self
 312     }
 313     fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _: &mut V) -> ControlFlow<V::BreakTy> {
 314         ControlFlow::CONTINUE
 315     }
 316 }
 317
 318 impl<'tcx> TypeFoldable<'tcx> for GeneratorSavedLocal {
 319     fn super_fold_with<F: TypeFolder<'tcx>>(self, _: &mut F) -> Self {
 320         self
 321     }
 322     fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _: &mut V) -> ControlFlow<V::BreakTy> {
 323         ControlFlow::CONTINUE
 324     }
 325 }
 326
 327 impl<'tcx, R: Idx, C: Idx> TypeFoldable<'tcx> for BitMatrix<R, C> {
 328     fn super_fold_with<F: TypeFolder<'tcx>>(self, _: &mut F) -> Self {
 329         self
 330     }
 331     fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _: &mut V) -> ControlFlow<V::BreakTy> {
 332         ControlFlow::CONTINUE
 333     }
 334 }
 335
 336 impl<'tcx> TypeFoldable<'tcx> for Constant<'tcx> {
 337     fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
 338         Constant {
 339             span: self.span,
 340             user_ty: self.user_ty.fold_with(folder),
 341             literal: self.literal.fold_with(folder),
 342         }
 343     }
 344     fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
 345         self.literal.visit_with(visitor)?;
 346         self.user_ty.visit_with(visitor)
 347     }
 348 }
 349
 350 impl<'tcx> TypeFoldable<'tcx> for ConstantKind<'tcx> {
 351     #[inline(always)]
 352     fn fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
 353         folder.fold_mir_const(self)
 354     }
 355
 356     fn super_fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self {
 357         match self {
 358             ConstantKind::Ty(c) => ConstantKind::Ty(c.fold_with(folder)),
 359             ConstantKind::Val(v, t) => ConstantKind::Val(v, t.fold_with(folder)),
 360         }
 361     }
 362
 363     fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
 364         match *self {
 365             ConstantKind::Ty(c) => c.visit_with(visitor),
 366             ConstantKind::Val(_, t) => t.visit_with(visitor),
 367         }
 368     }
 369 }