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Refactor unwind in MIR #102906

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merged 16 commits into from
Apr 7, 2023
Merged

Refactor unwind in MIR #102906

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daeb844
Refactor unwind from Option to a new enum
nbdd0121 Oct 8, 2022
5e6ed13
Add `UnwindAction::Unreachable`
nbdd0121 Oct 10, 2022
0a5dac3
Add `UnwindAction::Terminate`
nbdd0121 Oct 10, 2022
e3f2edc
Rename `Abort` terminator to `Terminate`
nbdd0121 Oct 31, 2022
3af45d6
Address review feedback
nbdd0121 Nov 15, 2022
5cbda2a
Fix tools
nbdd0121 Oct 10, 2022
bf6b84b
Fix new usage of old api
nbdd0121 Nov 15, 2022
de3f8a1
Fix MSVC build
nbdd0121 Nov 17, 2022
5ae3a53
Revert box_free unwind action
nbdd0121 Nov 17, 2022
e29b5ba
Fix mir interp of `TerminatorKind::Terminate`
nbdd0121 Nov 19, 2022
c5829c2
Fix new usage of old api
nbdd0121 Mar 6, 2023
2a9d710
Bless tests
nbdd0121 Apr 5, 2023
e06de16
Add miri tests for terminate terminator
nbdd0121 Nov 19, 2022
0412639
Ignore many tests on wasm32
nbdd0121 Apr 5, 2023
1499a6f
UnwindAction::Terminate edge is also critical edge
nbdd0121 Apr 6, 2023
ea69dad
Fix coverage test
nbdd0121 Apr 7, 2023
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7 changes: 5 additions & 2 deletions compiler/rustc_borrowck/src/diagnostics/find_use.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -11,7 +11,7 @@ use crate::{
};
use rustc_data_structures::fx::FxIndexSet;
use rustc_middle::mir::visit::{MirVisitable, PlaceContext, Visitor};
use rustc_middle::mir::{Body, Local, Location};
use rustc_middle::mir::{self, Body, Local, Location};
use rustc_middle::ty::{RegionVid, TyCtxt};

pub(crate) fn find<'tcx>(
Expand Down Expand Up @@ -70,7 +70,10 @@ impl<'cx, 'tcx> UseFinder<'cx, 'tcx> {
block_data
.terminator()
.successors()
.filter(|&bb| Some(&Some(bb)) != block_data.terminator().unwind())
.filter(|&bb| {
Some(&mir::UnwindAction::Cleanup(bb))
!= block_data.terminator().unwind()
})
.map(|bb| Location { statement_index: 0, block: bb }),
);
}
Expand Down
8 changes: 4 additions & 4 deletions compiler/rustc_borrowck/src/invalidation.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -125,7 +125,7 @@ impl<'cx, 'tcx> Visitor<'tcx> for InvalidationGenerator<'cx, 'tcx> {
args,
destination,
target: _,
cleanup: _,
unwind: _,
from_hir_call: _,
fn_span: _,
} => {
Expand All @@ -135,7 +135,7 @@ impl<'cx, 'tcx> Visitor<'tcx> for InvalidationGenerator<'cx, 'tcx> {
}
self.mutate_place(location, *destination, Deep);
}
TerminatorKind::Assert { cond, expected: _, msg, target: _, cleanup: _ } => {
TerminatorKind::Assert { cond, expected: _, msg, target: _, unwind: _ } => {
self.consume_operand(location, cond);
use rustc_middle::mir::AssertKind;
if let AssertKind::BoundsCheck { len, index } = msg {
Expand Down Expand Up @@ -173,7 +173,7 @@ impl<'cx, 'tcx> Visitor<'tcx> for InvalidationGenerator<'cx, 'tcx> {
options: _,
line_spans: _,
destination: _,
cleanup: _,
unwind: _,
} => {
for op in operands {
match op {
Expand All @@ -198,7 +198,7 @@ impl<'cx, 'tcx> Visitor<'tcx> for InvalidationGenerator<'cx, 'tcx> {
}
}
TerminatorKind::Goto { target: _ }
| TerminatorKind::Abort
| TerminatorKind::Terminate
| TerminatorKind::Unreachable
| TerminatorKind::FalseEdge { real_target: _, imaginary_target: _ }
| TerminatorKind::FalseUnwind { real_target: _, unwind: _ } => {
Expand Down
10 changes: 5 additions & 5 deletions compiler/rustc_borrowck/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -740,7 +740,7 @@ impl<'cx, 'tcx> rustc_mir_dataflow::ResultsVisitor<'cx, 'tcx> for MirBorrowckCtx
args,
destination,
target: _,
cleanup: _,
unwind: _,
from_hir_call: _,
fn_span: _,
} => {
Expand All @@ -750,7 +750,7 @@ impl<'cx, 'tcx> rustc_mir_dataflow::ResultsVisitor<'cx, 'tcx> for MirBorrowckCtx
}
self.mutate_place(loc, (*destination, span), Deep, flow_state);
}
TerminatorKind::Assert { cond, expected: _, msg, target: _, cleanup: _ } => {
TerminatorKind::Assert { cond, expected: _, msg, target: _, unwind: _ } => {
self.consume_operand(loc, (cond, span), flow_state);
use rustc_middle::mir::AssertKind;
if let AssertKind::BoundsCheck { len, index } = msg {
Expand All @@ -770,7 +770,7 @@ impl<'cx, 'tcx> rustc_mir_dataflow::ResultsVisitor<'cx, 'tcx> for MirBorrowckCtx
options: _,
line_spans: _,
destination: _,
cleanup: _,
unwind: _,
} => {
for op in operands {
match op {
Expand Down Expand Up @@ -801,7 +801,7 @@ impl<'cx, 'tcx> rustc_mir_dataflow::ResultsVisitor<'cx, 'tcx> for MirBorrowckCtx
}

TerminatorKind::Goto { target: _ }
| TerminatorKind::Abort
| TerminatorKind::Terminate
| TerminatorKind::Unreachable
| TerminatorKind::Resume
| TerminatorKind::Return
Expand Down Expand Up @@ -845,7 +845,7 @@ impl<'cx, 'tcx> rustc_mir_dataflow::ResultsVisitor<'cx, 'tcx> for MirBorrowckCtx
}
}

TerminatorKind::Abort
TerminatorKind::Terminate
| TerminatorKind::Assert { .. }
| TerminatorKind::Call { .. }
| TerminatorKind::Drop { .. }
Expand Down
61 changes: 32 additions & 29 deletions compiler/rustc_borrowck/src/type_check/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1300,7 +1300,7 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
match &term.kind {
TerminatorKind::Goto { .. }
| TerminatorKind::Resume
| TerminatorKind::Abort
| TerminatorKind::Terminate
| TerminatorKind::Return
| TerminatorKind::GeneratorDrop
| TerminatorKind::Unreachable
Expand Down Expand Up @@ -1584,7 +1584,7 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
span_mirbug!(self, block_data, "resume on non-cleanup block!")
}
}
TerminatorKind::Abort => {
TerminatorKind::Terminate => {
if !is_cleanup {
span_mirbug!(self, block_data, "abort on non-cleanup block!")
}
Expand All @@ -1610,49 +1610,29 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
}
TerminatorKind::Unreachable => {}
TerminatorKind::Drop { target, unwind, .. }
| TerminatorKind::Assert { target, cleanup: unwind, .. } => {
| TerminatorKind::Assert { target, unwind, .. } => {
self.assert_iscleanup(body, block_data, target, is_cleanup);
if let Some(unwind) = unwind {
if is_cleanup {
span_mirbug!(self, block_data, "unwind on cleanup block")
}
self.assert_iscleanup(body, block_data, unwind, true);
}
self.assert_iscleanup_unwind(body, block_data, unwind, is_cleanup);
}
TerminatorKind::Call { ref target, cleanup, .. } => {
TerminatorKind::Call { ref target, unwind, .. } => {
if let &Some(target) = target {
self.assert_iscleanup(body, block_data, target, is_cleanup);
}
if let Some(cleanup) = cleanup {
if is_cleanup {
span_mirbug!(self, block_data, "cleanup on cleanup block")
}
self.assert_iscleanup(body, block_data, cleanup, true);
}
self.assert_iscleanup_unwind(body, block_data, unwind, is_cleanup);
}
TerminatorKind::FalseEdge { real_target, imaginary_target } => {
self.assert_iscleanup(body, block_data, real_target, is_cleanup);
self.assert_iscleanup(body, block_data, imaginary_target, is_cleanup);
}
TerminatorKind::FalseUnwind { real_target, unwind } => {
self.assert_iscleanup(body, block_data, real_target, is_cleanup);
if let Some(unwind) = unwind {
if is_cleanup {
span_mirbug!(self, block_data, "cleanup in cleanup block via false unwind");
}
self.assert_iscleanup(body, block_data, unwind, true);
}
self.assert_iscleanup_unwind(body, block_data, unwind, is_cleanup);
}
TerminatorKind::InlineAsm { destination, cleanup, .. } => {
TerminatorKind::InlineAsm { destination, unwind, .. } => {
if let Some(target) = destination {
self.assert_iscleanup(body, block_data, target, is_cleanup);
}
if let Some(cleanup) = cleanup {
if is_cleanup {
span_mirbug!(self, block_data, "cleanup on cleanup block")
}
self.assert_iscleanup(body, block_data, cleanup, true);
}
self.assert_iscleanup_unwind(body, block_data, unwind, is_cleanup);
}
}
}
Expand All @@ -1669,6 +1649,29 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
}
}

fn assert_iscleanup_unwind(
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&mut self,
body: &Body<'tcx>,
ctxt: &dyn fmt::Debug,
unwind: UnwindAction,
is_cleanup: bool,
) {
match unwind {
UnwindAction::Cleanup(unwind) => {
if is_cleanup {
span_mirbug!(self, ctxt, "unwind on cleanup block")
}
self.assert_iscleanup(body, ctxt, unwind, true);
}
UnwindAction::Continue => {
if is_cleanup {
span_mirbug!(self, ctxt, "unwind on cleanup block")
}
}
UnwindAction::Unreachable | UnwindAction::Terminate => (),
}
}

fn check_local(&mut self, body: &Body<'tcx>, local: Local, local_decl: &LocalDecl<'tcx>) {
match body.local_kind(local) {
LocalKind::ReturnPointer | LocalKind::Arg => {
Expand Down
8 changes: 4 additions & 4 deletions compiler/rustc_codegen_cranelift/src/base.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -345,7 +345,7 @@ fn codegen_fn_body(fx: &mut FunctionCx<'_, '_, '_>, start_block: Block) {
TerminatorKind::Return => {
crate::abi::codegen_return(fx);
}
TerminatorKind::Assert { cond, expected, msg, target, cleanup: _ } => {
TerminatorKind::Assert { cond, expected, msg, target, unwind: _ } => {
if !fx.tcx.sess.overflow_checks() && msg.is_optional_overflow_check() {
let target = fx.get_block(*target);
fx.bcx.ins().jump(target, &[]);
Expand Down Expand Up @@ -450,7 +450,7 @@ fn codegen_fn_body(fx: &mut FunctionCx<'_, '_, '_>, start_block: Block) {
destination,
target,
fn_span,
cleanup: _,
unwind: _,
from_hir_call: _,
} => {
fx.tcx.prof.generic_activity("codegen call").run(|| {
Expand All @@ -470,7 +470,7 @@ fn codegen_fn_body(fx: &mut FunctionCx<'_, '_, '_>, start_block: Block) {
options,
destination,
line_spans: _,
cleanup: _,
unwind: _,
} => {
if options.contains(InlineAsmOptions::MAY_UNWIND) {
fx.tcx.sess.span_fatal(
Expand All @@ -488,7 +488,7 @@ fn codegen_fn_body(fx: &mut FunctionCx<'_, '_, '_>, start_block: Block) {
*destination,
);
}
TerminatorKind::Abort => {
TerminatorKind::Terminate => {
codegen_panic_cannot_unwind(fx, source_info);
}
TerminatorKind::Resume => {
Expand Down
2 changes: 1 addition & 1 deletion compiler/rustc_codegen_cranelift/src/constant.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -549,7 +549,7 @@ pub(crate) fn mir_operand_get_const_val<'tcx>(
TerminatorKind::Goto { .. }
| TerminatorKind::SwitchInt { .. }
| TerminatorKind::Resume
| TerminatorKind::Abort
| TerminatorKind::Terminate
| TerminatorKind::Return
| TerminatorKind::Unreachable
| TerminatorKind::Drop { .. }
Expand Down
10 changes: 5 additions & 5 deletions compiler/rustc_codegen_ssa/src/mir/analyze.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -284,19 +284,19 @@ pub fn cleanup_kinds(mir: &mir::Body<'_>) -> IndexVec<mir::BasicBlock, CleanupKi
match data.terminator().kind {
TerminatorKind::Goto { .. }
| TerminatorKind::Resume
| TerminatorKind::Abort
| TerminatorKind::Terminate
| TerminatorKind::Return
| TerminatorKind::GeneratorDrop
| TerminatorKind::Unreachable
| TerminatorKind::SwitchInt { .. }
| TerminatorKind::Yield { .. }
| TerminatorKind::FalseEdge { .. }
| TerminatorKind::FalseUnwind { .. } => { /* nothing to do */ }
TerminatorKind::Call { cleanup: unwind, .. }
| TerminatorKind::InlineAsm { cleanup: unwind, .. }
| TerminatorKind::Assert { cleanup: unwind, .. }
TerminatorKind::Call { unwind, .. }
| TerminatorKind::InlineAsm { unwind, .. }
| TerminatorKind::Assert { unwind, .. }
| TerminatorKind::Drop { unwind, .. } => {
if let Some(unwind) = unwind {
if let mir::UnwindAction::Cleanup(unwind) = unwind {
debug!(
"cleanup_kinds: {:?}/{:?} registering {:?} as funclet",
bb, data, unwind
Expand Down
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