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Auto merge of #72093 - jonas-schievink:unmut, r=oli-obk
Avoid `Operand::Copy` with `&mut T` This is generally unsound to do, as the copied type is assumed to implement `Copy`. Closes #46420
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,80 @@ | ||
| //! Validates the MIR to ensure that invariants are upheld. | ||
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| use super::{MirPass, MirSource}; | ||
| use rustc_middle::mir::visit::Visitor; | ||
| use rustc_middle::{ | ||
| mir::{Body, Location, Operand, Rvalue, Statement, StatementKind}, | ||
| ty::{ParamEnv, TyCtxt}, | ||
| }; | ||
| use rustc_span::{def_id::DefId, Span, DUMMY_SP}; | ||
|
|
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| pub struct Validator { | ||
| /// Describes at which point in the pipeline this validation is happening. | ||
| pub when: String, | ||
| } | ||
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|
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| impl<'tcx> MirPass<'tcx> for Validator { | ||
| fn run_pass(&self, tcx: TyCtxt<'tcx>, source: MirSource<'tcx>, body: &mut Body<'tcx>) { | ||
| let def_id = source.def_id(); | ||
| let param_env = tcx.param_env(def_id); | ||
| TypeChecker { when: &self.when, def_id, body, tcx, param_env }.visit_body(body); | ||
| } | ||
| } | ||
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| struct TypeChecker<'a, 'tcx> { | ||
| when: &'a str, | ||
| def_id: DefId, | ||
| body: &'a Body<'tcx>, | ||
| tcx: TyCtxt<'tcx>, | ||
| param_env: ParamEnv<'tcx>, | ||
| } | ||
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| impl<'a, 'tcx> TypeChecker<'a, 'tcx> { | ||
| fn fail(&self, span: Span, msg: impl AsRef<str>) { | ||
| // We use `delay_span_bug` as we might see broken MIR when other errors have already | ||
| // occurred. | ||
| self.tcx.sess.diagnostic().delay_span_bug( | ||
| span, | ||
| &format!("broken MIR in {:?} ({}): {}", self.def_id, self.when, msg.as_ref()), | ||
| ); | ||
| } | ||
| } | ||
|
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| impl<'a, 'tcx> Visitor<'tcx> for TypeChecker<'a, 'tcx> { | ||
| fn visit_operand(&mut self, operand: &Operand<'tcx>, location: Location) { | ||
| // `Operand::Copy` is only supposed to be used with `Copy` types. | ||
| if let Operand::Copy(place) = operand { | ||
| let ty = place.ty(&self.body.local_decls, self.tcx).ty; | ||
|
|
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| if !ty.is_copy_modulo_regions(self.tcx, self.param_env, DUMMY_SP) { | ||
| self.fail( | ||
| DUMMY_SP, | ||
| format!("`Operand::Copy` with non-`Copy` type {} at {:?}", ty, location), | ||
| ); | ||
| } | ||
| } | ||
|
|
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| self.super_operand(operand, location); | ||
| } | ||
|
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| fn visit_statement(&mut self, statement: &Statement<'tcx>, location: Location) { | ||
| // The sides of an assignment must not alias. Currently this just checks whether the places | ||
| // are identical. | ||
| if let StatementKind::Assign(box (dest, rvalue)) = &statement.kind { | ||
| match rvalue { | ||
| Rvalue::Use(Operand::Copy(src) | Operand::Move(src)) => { | ||
| if dest == src { | ||
| self.fail( | ||
| DUMMY_SP, | ||
| format!( | ||
| "encountered `Assign` statement with overlapping memory at {:?}", | ||
| location | ||
| ), | ||
| ); | ||
| } | ||
| } | ||
| _ => {} | ||
| } | ||
| } | ||
| } | ||
| } |
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