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 try_super_fold_with<F: FallibleTypeFolder<'tcx>>(
  20         self,
  21         folder: &mut F,
  22     ) -> Result<Self, F::Error> {
  23         use crate::mir::TerminatorKind::*;
  24
  25         let kind = match self.kind {
  26             Goto { target } => Goto { target },
  27             SwitchInt { discr, switch_ty, targets } => SwitchInt {
  28                 discr: discr.try_fold_with(folder)?,
  29                 switch_ty: switch_ty.try_fold_with(folder)?,
  30                 targets,
  31             },
  32             Drop { place, target, unwind } => {
  33                 Drop { place: place.try_fold_with(folder)?, target, unwind }
  34             }
  35             DropAndReplace { place, value, target, unwind } => DropAndReplace {
  36                 place: place.try_fold_with(folder)?,
  37                 value: value.try_fold_with(folder)?,
  38                 target,
  39                 unwind,
  40             },
  41             Yield { value, resume, resume_arg, drop } => Yield {
  42                 value: value.try_fold_with(folder)?,
  43                 resume,
  44                 resume_arg: resume_arg.try_fold_with(folder)?,
  45                 drop,
  46             },
  47             Call { func, args, destination, cleanup, from_hir_call, fn_span } => {
  48                 let dest = destination
  49                     .map(|(loc, dest)| (loc.try_fold_with(folder).map(|loc| (loc, dest))))
  50                     .transpose()?;
  51
  52                 Call {
  53                     func: func.try_fold_with(folder)?,
  54                     args: args.try_fold_with(folder)?,
  55                     destination: dest,
  56                     cleanup,
  57                     from_hir_call,
  58                     fn_span,
  59                 }
  60             }
  61             Assert { cond, expected, msg, target, cleanup } => {
  62                 use AssertKind::*;
  63                 let msg = match msg {
  64                     BoundsCheck { len, index } => BoundsCheck {
  65                         len: len.try_fold_with(folder)?,
  66                         index: index.try_fold_with(folder)?,
  67                     },
  68                     Overflow(op, l, r) => {
  69                         Overflow(op, l.try_fold_with(folder)?, r.try_fold_with(folder)?)
  70                     }
  71                     OverflowNeg(op) => OverflowNeg(op.try_fold_with(folder)?),
  72                     DivisionByZero(op) => DivisionByZero(op.try_fold_with(folder)?),
  73                     RemainderByZero(op) => RemainderByZero(op.try_fold_with(folder)?),
  74                     ResumedAfterReturn(_) | ResumedAfterPanic(_) => msg,
  75                 };
  76                 Assert { cond: cond.try_fold_with(folder)?, expected, msg, target, cleanup }
  77             }
  78             GeneratorDrop => GeneratorDrop,
  79             Resume => Resume,
  80             Abort => Abort,
  81             Return => Return,
  82             Unreachable => Unreachable,
  83             FalseEdge { real_target, imaginary_target } => {
  84                 FalseEdge { real_target, imaginary_target }
  85             }
  86             FalseUnwind { real_target, unwind } => FalseUnwind { real_target, unwind },
  87             InlineAsm { template, operands, options, line_spans, destination } => InlineAsm {
  88                 template,
  89                 operands: operands.try_fold_with(folder)?,
  90                 options,
  91                 line_spans,
  92                 destination,
  93             },
  94         };
  95         Ok(Terminator { source_info: self.source_info, kind })
  96     }
  97
  98     fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
  99         use crate::mir::TerminatorKind::*;
 100
 101         match self.kind {
 102             SwitchInt { ref discr, switch_ty, .. } => {
 103                 discr.visit_with(visitor)?;
 104                 switch_ty.visit_with(visitor)
 105             }
 106             Drop { ref place, .. } => place.visit_with(visitor),
 107             DropAndReplace { ref place, ref value, .. } => {
 108                 place.visit_with(visitor)?;
 109                 value.visit_with(visitor)
 110             }
 111             Yield { ref value, .. } => value.visit_with(visitor),
 112             Call { ref func, ref args, ref destination, .. } => {
 113                 if let Some((ref loc, _)) = *destination {
 114                     loc.visit_with(visitor)?;
 115                 };
 116                 func.visit_with(visitor)?;
 117                 args.visit_with(visitor)
 118             }
 119             Assert { ref cond, ref msg, .. } => {
 120                 cond.visit_with(visitor)?;
 121                 use AssertKind::*;
 122                 match msg {
 123                     BoundsCheck { ref len, ref index } => {
 124                         len.visit_with(visitor)?;
 125                         index.visit_with(visitor)
 126                     }
 127                     Overflow(_, l, r) => {
 128                         l.visit_with(visitor)?;
 129                         r.visit_with(visitor)
 130                     }
 131                     OverflowNeg(op) | DivisionByZero(op) | RemainderByZero(op) => {
 132                         op.visit_with(visitor)
 133                     }
 134                     ResumedAfterReturn(_) | ResumedAfterPanic(_) => ControlFlow::CONTINUE,
 135                 }
 136             }
 137             InlineAsm { ref operands, .. } => operands.visit_with(visitor),
 138             Goto { .. }
 139             | Resume
 140             | Abort
 141             | Return
 142             | GeneratorDrop
 143             | Unreachable
 144             | FalseEdge { .. }
 145             | FalseUnwind { .. } => ControlFlow::CONTINUE,
 146         }
 147     }
 148 }
 149
 150 impl<'tcx> TypeFoldable<'tcx> for GeneratorKind {
 151     fn try_super_fold_with<F: FallibleTypeFolder<'tcx>>(self, _: &mut F) -> Result<Self, F::Error> {
 152         Ok(self)
 153     }
 154
 155     fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _: &mut V) -> ControlFlow<V::BreakTy> {
 156         ControlFlow::CONTINUE
 157     }
 158 }
 159
 160 impl<'tcx> TypeFoldable<'tcx> for Place<'tcx> {
 161     fn try_super_fold_with<F: FallibleTypeFolder<'tcx>>(
 162         self,
 163         folder: &mut F,
 164     ) -> Result<Self, F::Error> {
 165         Ok(Place {
 166             local: self.local.try_fold_with(folder)?,
 167             projection: self.projection.try_fold_with(folder)?,
 168         })
 169     }
 170
 171     fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
 172         self.local.visit_with(visitor)?;
 173         self.projection.visit_with(visitor)
 174     }
 175 }
 176
 177 impl<'tcx> TypeFoldable<'tcx> for &'tcx ty::List<PlaceElem<'tcx>> {
 178     fn try_super_fold_with<F: FallibleTypeFolder<'tcx>>(
 179         self,
 180         folder: &mut F,
 181     ) -> Result<Self, F::Error> {
 182         ty::util::fold_list(self, folder, |tcx, v| tcx.intern_place_elems(v))
 183     }
 184
 185     fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
 186         self.iter().try_for_each(|t| t.visit_with(visitor))
 187     }
 188 }
 189
 190 impl<'tcx> TypeFoldable<'tcx> for Rvalue<'tcx> {
 191     fn try_super_fold_with<F: FallibleTypeFolder<'tcx>>(
 192         self,
 193         folder: &mut F,
 194     ) -> Result<Self, F::Error> {
 195         use crate::mir::Rvalue::*;
 196         Ok(match self {
 197             Use(op) => Use(op.try_fold_with(folder)?),
 198             Repeat(op, len) => Repeat(op.try_fold_with(folder)?, len.try_fold_with(folder)?),
 199             ThreadLocalRef(did) => ThreadLocalRef(did.try_fold_with(folder)?),
 200             Ref(region, bk, place) => {
 201                 Ref(region.try_fold_with(folder)?, bk, place.try_fold_with(folder)?)
 202             }
 203             AddressOf(mutability, place) => AddressOf(mutability, place.try_fold_with(folder)?),
 204             Len(place) => Len(place.try_fold_with(folder)?),
 205             Cast(kind, op, ty) => Cast(kind, op.try_fold_with(folder)?, ty.try_fold_with(folder)?),
 206             BinaryOp(op, box (rhs, lhs)) => {
 207                 BinaryOp(op, Box::new((rhs.try_fold_with(folder)?, lhs.try_fold_with(folder)?)))
 208             }
 209             CheckedBinaryOp(op, box (rhs, lhs)) => CheckedBinaryOp(
 210                 op,
 211                 Box::new((rhs.try_fold_with(folder)?, lhs.try_fold_with(folder)?)),
 212             ),
 213             UnaryOp(op, val) => UnaryOp(op, val.try_fold_with(folder)?),
 214             Discriminant(place) => Discriminant(place.try_fold_with(folder)?),
 215             NullaryOp(op, ty) => NullaryOp(op, ty.try_fold_with(folder)?),
 216             Aggregate(kind, fields) => {
 217                 let kind = kind.try_map_id(|kind| {
 218                     Ok(match kind {
 219                         AggregateKind::Array(ty) => AggregateKind::Array(ty.try_fold_with(folder)?),
 220                         AggregateKind::Tuple => AggregateKind::Tuple,
 221                         AggregateKind::Adt(def, v, substs, user_ty, n) => AggregateKind::Adt(
 222                             def,
 223                             v,
 224                             substs.try_fold_with(folder)?,
 225                             user_ty.try_fold_with(folder)?,
 226                             n,
 227                         ),
 228                         AggregateKind::Closure(id, substs) => {
 229                             AggregateKind::Closure(id, substs.try_fold_with(folder)?)
 230                         }
 231                         AggregateKind::Generator(id, substs, movablity) => {
 232                             AggregateKind::Generator(id, substs.try_fold_with(folder)?, movablity)
 233                         }
 234                     })
 235                 })?;
 236                 Aggregate(kind, fields.try_fold_with(folder)?)
 237             }
 238             ShallowInitBox(op, ty) => {
 239                 ShallowInitBox(op.try_fold_with(folder)?, ty.try_fold_with(folder)?)
 240             }
 241         })
 242     }
 243
 244     fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
 245         use crate::mir::Rvalue::*;
 246         match *self {
 247             Use(ref op) => op.visit_with(visitor),
 248             Repeat(ref op, _) => op.visit_with(visitor),
 249             ThreadLocalRef(did) => did.visit_with(visitor),
 250             Ref(region, _, ref place) => {
 251                 region.visit_with(visitor)?;
 252                 place.visit_with(visitor)
 253             }
 254             AddressOf(_, ref place) => place.visit_with(visitor),
 255             Len(ref place) => place.visit_with(visitor),
 256             Cast(_, ref op, ty) => {
 257                 op.visit_with(visitor)?;
 258                 ty.visit_with(visitor)
 259             }
 260             BinaryOp(_, box (ref rhs, ref lhs)) | CheckedBinaryOp(_, box (ref rhs, ref lhs)) => {
 261                 rhs.visit_with(visitor)?;
 262                 lhs.visit_with(visitor)
 263             }
 264             UnaryOp(_, ref val) => val.visit_with(visitor),
 265             Discriminant(ref place) => place.visit_with(visitor),
 266             NullaryOp(_, ty) => ty.visit_with(visitor),
 267             Aggregate(ref kind, ref fields) => {
 268                 match **kind {
 269                     AggregateKind::Array(ty) => {
 270                         ty.visit_with(visitor)?;
 271                     }
 272                     AggregateKind::Tuple => {}
 273                     AggregateKind::Adt(_, _, substs, user_ty, _) => {
 274                         substs.visit_with(visitor)?;
 275                         user_ty.visit_with(visitor)?;
 276                     }
 277                     AggregateKind::Closure(_, substs) => {
 278                         substs.visit_with(visitor)?;
 279                     }
 280                     AggregateKind::Generator(_, substs, _) => {
 281                         substs.visit_with(visitor)?;
 282                     }
 283                 }
 284                 fields.visit_with(visitor)
 285             }
 286             ShallowInitBox(ref op, ty) => {
 287                 op.visit_with(visitor)?;
 288                 ty.visit_with(visitor)
 289             }
 290         }
 291     }
 292 }
 293
 294 impl<'tcx> TypeFoldable<'tcx> for Operand<'tcx> {
 295     fn try_super_fold_with<F: FallibleTypeFolder<'tcx>>(
 296         self,
 297         folder: &mut F,
 298     ) -> Result<Self, F::Error> {
 299         Ok(match self {
 300             Operand::Copy(place) => Operand::Copy(place.try_fold_with(folder)?),
 301             Operand::Move(place) => Operand::Move(place.try_fold_with(folder)?),
 302             Operand::Constant(c) => Operand::Constant(c.try_fold_with(folder)?),
 303         })
 304     }
 305
 306     fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
 307         match *self {
 308             Operand::Copy(ref place) | Operand::Move(ref place) => place.visit_with(visitor),
 309             Operand::Constant(ref c) => c.visit_with(visitor),
 310         }
 311     }
 312 }
 313
 314 impl<'tcx> TypeFoldable<'tcx> for PlaceElem<'tcx> {
 315     fn try_super_fold_with<F: FallibleTypeFolder<'tcx>>(
 316         self,
 317         folder: &mut F,
 318     ) -> Result<Self, F::Error> {
 319         use crate::mir::ProjectionElem::*;
 320
 321         Ok(match self {
 322             Deref => Deref,
 323             Field(f, ty) => Field(f, ty.try_fold_with(folder)?),
 324             Index(v) => Index(v.try_fold_with(folder)?),
 325             Downcast(symbol, variantidx) => Downcast(symbol, variantidx),
 326             ConstantIndex { offset, min_length, from_end } => {
 327                 ConstantIndex { offset, min_length, from_end }
 328             }
 329             Subslice { from, to, from_end } => Subslice { from, to, from_end },
 330         })
 331     }
 332
 333     fn super_visit_with<Vs: TypeVisitor<'tcx>>(
 334         &self,
 335         visitor: &mut Vs,
 336     ) -> ControlFlow<Vs::BreakTy> {
 337         use crate::mir::ProjectionElem::*;
 338
 339         match self {
 340             Field(_, ty) => ty.visit_with(visitor),
 341             Index(v) => v.visit_with(visitor),
 342             _ => ControlFlow::CONTINUE,
 343         }
 344     }
 345 }
 346
 347 impl<'tcx> TypeFoldable<'tcx> for Field {
 348     fn try_super_fold_with<F: FallibleTypeFolder<'tcx>>(self, _: &mut F) -> Result<Self, F::Error> {
 349         Ok(self)
 350     }
 351     fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _: &mut V) -> ControlFlow<V::BreakTy> {
 352         ControlFlow::CONTINUE
 353     }
 354 }
 355
 356 impl<'tcx> TypeFoldable<'tcx> for GeneratorSavedLocal {
 357     fn try_super_fold_with<F: FallibleTypeFolder<'tcx>>(self, _: &mut F) -> Result<Self, F::Error> {
 358         Ok(self)
 359     }
 360     fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _: &mut V) -> ControlFlow<V::BreakTy> {
 361         ControlFlow::CONTINUE
 362     }
 363 }
 364
 365 impl<'tcx, R: Idx, C: Idx> TypeFoldable<'tcx> for BitMatrix<R, C> {
 366     fn try_super_fold_with<F: FallibleTypeFolder<'tcx>>(self, _: &mut F) -> Result<Self, F::Error> {
 367         Ok(self)
 368     }
 369     fn super_visit_with<V: TypeVisitor<'tcx>>(&self, _: &mut V) -> ControlFlow<V::BreakTy> {
 370         ControlFlow::CONTINUE
 371     }
 372 }
 373
 374 impl<'tcx> TypeFoldable<'tcx> for Constant<'tcx> {
 375     fn try_super_fold_with<F: FallibleTypeFolder<'tcx>>(
 376         self,
 377         folder: &mut F,
 378     ) -> Result<Self, F::Error> {
 379         Ok(Constant {
 380             span: self.span,
 381             user_ty: self.user_ty.try_fold_with(folder)?,
 382             literal: self.literal.try_fold_with(folder)?,
 383         })
 384     }
 385     fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
 386         self.literal.visit_with(visitor)?;
 387         self.user_ty.visit_with(visitor)
 388     }
 389 }
 390
 391 impl<'tcx> TypeFoldable<'tcx> for ConstantKind<'tcx> {
 392     #[inline(always)]
 393     fn try_fold_with<F: FallibleTypeFolder<'tcx>>(self, folder: &mut F) -> Result<Self, F::Error> {
 394         folder.try_fold_mir_const(self)
 395     }
 396
 397     fn try_super_fold_with<F: FallibleTypeFolder<'tcx>>(
 398         self,
 399         folder: &mut F,
 400     ) -> Result<Self, F::Error> {
 401         match self {
 402             ConstantKind::Ty(c) => Ok(ConstantKind::Ty(c.try_fold_with(folder)?)),
 403             ConstantKind::Val(v, t) => Ok(ConstantKind::Val(v, t.try_fold_with(folder)?)),
 404         }
 405     }
 406
 407     fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
 408         match *self {
 409             ConstantKind::Ty(c) => c.visit_with(visitor),
 410             ConstantKind::Val(_, t) => t.visit_with(visitor),
 411         }
 412     }
 413 }