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Auto merge of #114993 - RalfJung:panic-nounwind, r=fee1-dead
interpret/miri: call the panic_nounwind machinery the same way codegen does
2 parents 85ee7e6 + 0277351 commit 5c6a7e7

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66 files changed

+408
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‎compiler/rustc_borrowck/src/invalidation.rs

Lines changed: 4 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -159,7 +159,9 @@ impl<'cx, 'tcx> Visitor<'tcx> for InvalidationGenerator<'cx, 'tcx> {
159159

160160
self.mutate_place(location, *resume_arg, Deep);
161161
}
162-
TerminatorKind::Resume | TerminatorKind::Return | TerminatorKind::GeneratorDrop => {
162+
TerminatorKind::UnwindResume
163+
| TerminatorKind::Return
164+
| TerminatorKind::GeneratorDrop => {
163165
// Invalidate all borrows of local places
164166
let borrow_set = self.borrow_set;
165167
let start = self.location_table.start_index(location);
@@ -200,7 +202,7 @@ impl<'cx, 'tcx> Visitor<'tcx> for InvalidationGenerator<'cx, 'tcx> {
200202
}
201203
}
202204
TerminatorKind::Goto { target: _ }
203-
| TerminatorKind::Terminate
205+
| TerminatorKind::UnwindTerminate
204206
| TerminatorKind::Unreachable
205207
| TerminatorKind::FalseEdge { real_target: _, imaginary_target: _ }
206208
| TerminatorKind::FalseUnwind { real_target: _, unwind: _ } => {

‎compiler/rustc_borrowck/src/lib.rs

Lines changed: 6 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -770,9 +770,9 @@ impl<'cx, 'tcx, R> rustc_mir_dataflow::ResultsVisitor<'cx, 'tcx, R> for MirBorro
770770
}
771771

772772
TerminatorKind::Goto { target: _ }
773-
| TerminatorKind::Terminate
773+
| TerminatorKind::UnwindTerminate
774774
| TerminatorKind::Unreachable
775-
| TerminatorKind::Resume
775+
| TerminatorKind::UnwindResume
776776
| TerminatorKind::Return
777777
| TerminatorKind::GeneratorDrop
778778
| TerminatorKind::FalseEdge { real_target: _, imaginary_target: _ }
@@ -803,7 +803,9 @@ impl<'cx, 'tcx, R> rustc_mir_dataflow::ResultsVisitor<'cx, 'tcx, R> for MirBorro
803803
}
804804
}
805805

806-
TerminatorKind::Resume | TerminatorKind::Return | TerminatorKind::GeneratorDrop => {
806+
TerminatorKind::UnwindResume
807+
| TerminatorKind::Return
808+
| TerminatorKind::GeneratorDrop => {
807809
// Returning from the function implicitly kills storage for all locals and statics.
808810
// Often, the storage will already have been killed by an explicit
809811
// StorageDead, but we don't always emit those (notably on unwind paths),
@@ -815,7 +817,7 @@ impl<'cx, 'tcx, R> rustc_mir_dataflow::ResultsVisitor<'cx, 'tcx, R> for MirBorro
815817
}
816818
}
817819

818-
TerminatorKind::Terminate
820+
TerminatorKind::UnwindTerminate
819821
| TerminatorKind::Assert { .. }
820822
| TerminatorKind::Call { .. }
821823
| TerminatorKind::Drop { .. }

‎compiler/rustc_borrowck/src/type_check/mod.rs

Lines changed: 4 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -1333,8 +1333,8 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
13331333
debug!("terminator kind: {:?}", term.kind);
13341334
match &term.kind {
13351335
TerminatorKind::Goto { .. }
1336-
| TerminatorKind::Resume
1337-
| TerminatorKind::Terminate
1336+
| TerminatorKind::UnwindResume
1337+
| TerminatorKind::UnwindTerminate
13381338
| TerminatorKind::Return
13391339
| TerminatorKind::GeneratorDrop
13401340
| TerminatorKind::Unreachable
@@ -1608,12 +1608,12 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
16081608
self.assert_iscleanup(body, block_data, *target, is_cleanup);
16091609
}
16101610
}
1611-
TerminatorKind::Resume => {
1611+
TerminatorKind::UnwindResume => {
16121612
if !is_cleanup {
16131613
span_mirbug!(self, block_data, "resume on non-cleanup block!")
16141614
}
16151615
}
1616-
TerminatorKind::Terminate => {
1616+
TerminatorKind::UnwindTerminate => {
16171617
if !is_cleanup {
16181618
span_mirbug!(self, block_data, "abort on non-cleanup block!")
16191619
}

‎compiler/rustc_codegen_cranelift/src/base.rs

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -474,10 +474,10 @@ fn codegen_fn_body(fx: &mut FunctionCx<'_, '_, '_>, start_block: Block) {
474474
*destination,
475475
);
476476
}
477-
TerminatorKind::Terminate => {
477+
TerminatorKind::UnwindTerminate => {
478478
codegen_panic_cannot_unwind(fx, source_info);
479479
}
480-
TerminatorKind::Resume => {
480+
TerminatorKind::UnwindResume => {
481481
// FIXME implement unwinding
482482
fx.bcx.ins().trap(TrapCode::UnreachableCodeReached);
483483
}

‎compiler/rustc_codegen_cranelift/src/constant.rs

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -550,8 +550,8 @@ pub(crate) fn mir_operand_get_const_val<'tcx>(
550550
match &bb_data.terminator().kind {
551551
TerminatorKind::Goto { .. }
552552
| TerminatorKind::SwitchInt { .. }
553-
| TerminatorKind::Resume
554-
| TerminatorKind::Terminate
553+
| TerminatorKind::UnwindResume
554+
| TerminatorKind::UnwindTerminate
555555
| TerminatorKind::Return
556556
| TerminatorKind::Unreachable
557557
| TerminatorKind::Drop { .. }

‎compiler/rustc_codegen_ssa/src/mir/analyze.rs

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -284,8 +284,8 @@ pub fn cleanup_kinds(mir: &mir::Body<'_>) -> IndexVec<mir::BasicBlock, CleanupKi
284284
for (bb, data) in mir.basic_blocks.iter_enumerated() {
285285
match data.terminator().kind {
286286
TerminatorKind::Goto { .. }
287-
| TerminatorKind::Resume
288-
| TerminatorKind::Terminate
287+
| TerminatorKind::UnwindResume
288+
| TerminatorKind::UnwindTerminate
289289
| TerminatorKind::Return
290290
| TerminatorKind::GeneratorDrop
291291
| TerminatorKind::Unreachable

‎compiler/rustc_codegen_ssa/src/mir/block.rs

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1224,12 +1224,12 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
12241224

12251225
self.set_debug_loc(bx, terminator.source_info);
12261226
match terminator.kind {
1227-
mir::TerminatorKind::Resume => {
1227+
mir::TerminatorKind::UnwindResume => {
12281228
self.codegen_resume_terminator(helper, bx);
12291229
MergingSucc::False
12301230
}
12311231

1232-
mir::TerminatorKind::Terminate => {
1232+
mir::TerminatorKind::UnwindTerminate => {
12331233
self.codegen_terminate_terminator(helper, bx, terminator);
12341234
MergingSucc::False
12351235
}

‎compiler/rustc_const_eval/src/const_eval/error.rs

Lines changed: 1 addition & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -18,7 +18,6 @@ pub enum ConstEvalErrKind {
1818
ModifiedGlobal,
1919
AssertFailure(AssertKind<ConstInt>),
2020
Panic { msg: Symbol, line: u32, col: u32, file: Symbol },
21-
Abort(String),
2221
}
2322

2423
impl MachineStopType for ConstEvalErrKind {
@@ -30,7 +29,6 @@ impl MachineStopType for ConstEvalErrKind {
3029
ModifiedGlobal => const_eval_modified_global,
3130
Panic { .. } => const_eval_panic,
3231
AssertFailure(x) => x.diagnostic_message(),
33-
Abort(msg) => msg.to_string().into(),
3432
}
3533
}
3634
fn add_args(
@@ -39,7 +37,7 @@ impl MachineStopType for ConstEvalErrKind {
3937
) {
4038
use ConstEvalErrKind::*;
4139
match *self {
42-
ConstAccessesStatic | ModifiedGlobal | Abort(_) => {}
40+
ConstAccessesStatic | ModifiedGlobal => {}
4341
AssertFailure(kind) => kind.add_args(adder),
4442
Panic { msg, line, col, file } => {
4543
adder("msg".into(), msg.into_diagnostic_arg());

‎compiler/rustc_const_eval/src/const_eval/machine.rs

Lines changed: 7 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -464,6 +464,13 @@ impl<'mir, 'tcx> interpret::Machine<'mir, 'tcx> for CompileTimeInterpreter<'mir,
464464
Ok(Some((ecx.load_mir(instance.def, None)?, orig_instance)))
465465
}
466466

467+
fn panic_nounwind(ecx: &mut InterpCx<'mir, 'tcx, Self>, msg: &str) -> InterpResult<'tcx> {
468+
let msg = Symbol::intern(msg);
469+
let span = ecx.find_closest_untracked_caller_location();
470+
let (file, line, col) = ecx.location_triple_for_span(span);
471+
Err(ConstEvalErrKind::Panic { msg, file, line, col }.into())
472+
}
473+
467474
fn call_intrinsic(
468475
ecx: &mut InterpCx<'mir, 'tcx, Self>,
469476
instance: ty::Instance<'tcx>,
@@ -584,10 +591,6 @@ impl<'mir, 'tcx> interpret::Machine<'mir, 'tcx> for CompileTimeInterpreter<'mir,
584591
Err(ConstEvalErrKind::AssertFailure(err).into())
585592
}
586593

587-
fn abort(_ecx: &mut InterpCx<'mir, 'tcx, Self>, msg: String) -> InterpResult<'tcx, !> {
588-
Err(ConstEvalErrKind::Abort(msg).into())
589-
}
590-
591594
fn binary_ptr_op(
592595
_ecx: &InterpCx<'mir, 'tcx, Self>,
593596
_bin_op: mir::BinOp,

‎compiler/rustc_const_eval/src/interpret/eval_context.rs

Lines changed: 5 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -765,7 +765,10 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
765765
}
766766
mir::UnwindAction::Terminate => {
767767
self.frame_mut().loc = Right(self.frame_mut().body.span);
768-
M::abort(self, "panic in a function that cannot unwind".to_owned())?;
768+
M::unwind_terminate(self)?;
769+
// This might have pushed a new stack frame, or it terminated execution.
770+
// Either way, `loc` will not be updated.
771+
return Ok(());
769772
}
770773
};
771774
Ok(())
@@ -865,6 +868,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
865868
panic!("encountered StackPopCleanup::Root when unwinding!")
866869
}
867870
};
871+
// This must be the very last thing that happens, since it can in fact push a new stack frame.
868872
self.unwind_to_block(unwind)
869873
} else {
870874
// Follow the normal return edge.

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