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Rollup merge of rust-lang#100192 - tmiasko:rm-duplicated-locals, r=na…
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…gisa

 Remove duplicated temporaries creating during box derefs elaboration

Temporaries created with `MirPatch::new_temp` will be declared after
patch application. Remove manually created duplicate declarations.

Removing duplicates exposes another issue. Visitor elaborates
terminator twice and attempts to access new, but not yet available,
local declarations. Remove duplicated call to `visit_terminator`.

Extracted from rust-lang#99946.
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@Dylan-DPC
Dylan-DPC committed Aug 11, 2022
2 parents 8bdb414 + 7d2131a commit 58dc085
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Showing 4 changed files with 22 additions and 34 deletions.
8 changes: 0 additions & 8 deletions compiler/rustc_mir_transform/src/elaborate_box_derefs.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -70,7 +70,6 @@ impl<'tcx, 'a> MutVisitor<'tcx> for ElaborateBoxDerefVisitor<'tcx, 'a> {
build_ptr_tys(tcx, base_ty.boxed_ty(), self.unique_did, self.nonnull_did);

let ptr_local = self.patch.new_temp(ptr_ty, source_info.span);
self.local_decls.push(LocalDecl::new(ptr_ty, source_info.span));

self.patch.add_statement(location, StatementKind::StorageLive(ptr_local));

Expand Down Expand Up @@ -125,13 +124,6 @@ impl<'tcx> MirPass<'tcx> for ElaborateBoxDerefs {
index += 1;
}

if let Some(terminator) = terminator
&& !matches!(terminator.kind, TerminatorKind::Yield{..})
{
let location = Location { block, statement_index: index };
visitor.visit_terminator(terminator, location);
}

let location = Location { block, statement_index: index };
match terminator {
// yielding into a box is handled when lowering generators
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2 changes: 0 additions & 2 deletions src/test/mir-opt/const_prop/boxes.main.ConstProp.diff
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Original file line number Diff line number Diff line change
Expand Up @@ -12,8 +12,6 @@
let mut _7: std::boxed::Box<i32>; // in scope 0 at $DIR/boxes.rs:+1:14: +1:22
let mut _8: *const i32; // in scope 0 at $DIR/boxes.rs:+1:14: +1:22
let mut _9: *const i32; // in scope 0 at $DIR/boxes.rs:+1:14: +1:22
let mut _10: *const i32; // in scope 0 at $DIR/boxes.rs:+1:14: +1:22
let mut _11: *const i32; // in scope 0 at $DIR/boxes.rs:+1:14: +1:22
scope 1 {
debug x => _1; // in scope 1 at $DIR/boxes.rs:+1:9: +1:10
}
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23 changes: 11 additions & 12 deletions src/test/mir-opt/inline/inline_into_box_place.main.Inline.32bit.diff
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Original file line number Diff line number Diff line change
Expand Up @@ -10,15 +10,14 @@
let mut _5: std::boxed::Box<std::vec::Vec<u32>>; // in scope 0 at $DIR/inline-into-box-place.rs:+1:29: +1:43
let mut _6: (); // in scope 0 at $DIR/inline-into-box-place.rs:+1:42: +1:43
let mut _7: *const std::vec::Vec<u32>; // in scope 0 at $DIR/inline-into-box-place.rs:+1:29: +1:43
let mut _8: *const std::vec::Vec<u32>; // in scope 0 at $DIR/inline-into-box-place.rs:+1:29: +1:43
+ let mut _9: &mut std::vec::Vec<u32>; // in scope 0 at $DIR/inline-into-box-place.rs:+1:33: +1:43
+ let mut _8: &mut std::vec::Vec<u32>; // in scope 0 at $DIR/inline-into-box-place.rs:+1:33: +1:43
scope 1 {
debug _x => _1; // in scope 1 at $DIR/inline-into-box-place.rs:+1:9: +1:11
}
scope 2 {
}
+ scope 3 (inlined Vec::<u32>::new) { // at $DIR/inline-into-box-place.rs:8:33: 8:43
+ let mut _10: alloc::raw_vec::RawVec<u32>; // in scope 3 at $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
+ let mut _9: alloc::raw_vec::RawVec<u32>; // in scope 3 at $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
+ }

bb0: {
Expand All @@ -37,10 +36,10 @@
StorageLive(_7); // scope 0 at $DIR/inline-into-box-place.rs:+1:33: +1:43
_7 = (((_5.0: std::ptr::Unique<std::vec::Vec<u32>>).0: std::ptr::NonNull<std::vec::Vec<u32>>).0: *const std::vec::Vec<u32>); // scope 0 at $DIR/inline-into-box-place.rs:+1:33: +1:43
- (*_7) = Vec::<u32>::new() -> [return: bb2, unwind: bb4]; // scope 0 at $DIR/inline-into-box-place.rs:+1:33: +1:43
+ StorageLive(_9); // scope 0 at $DIR/inline-into-box-place.rs:+1:33: +1:43
+ _9 = &mut (*_7); // scope 0 at $DIR/inline-into-box-place.rs:+1:33: +1:43
+ StorageLive(_10); // scope 3 at $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
+ _10 = const alloc::raw_vec::RawVec::<u32>::NEW; // scope 3 at $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
+ StorageLive(_8); // scope 0 at $DIR/inline-into-box-place.rs:+1:33: +1:43
+ _8 = &mut (*_7); // scope 0 at $DIR/inline-into-box-place.rs:+1:33: +1:43
+ StorageLive(_9); // scope 3 at $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
+ _9 = const alloc::raw_vec::RawVec::<u32>::NEW; // scope 3 at $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
// mir::Constant
- // + span: $DIR/inline-into-box-place.rs:8:33: 8:41
- // + user_ty: UserType(1)
Expand All @@ -51,11 +50,11 @@
+ // + span: $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
+ // + user_ty: UserType(0)
+ // + literal: Const { ty: alloc::raw_vec::RawVec<u32>, val: Unevaluated(alloc::raw_vec::RawVec::<T>::NEW, [u32], None) }
+ Deinit((*_9)); // scope 3 at $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
+ ((*_9).0: alloc::raw_vec::RawVec<u32>) = move _10; // scope 3 at $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
+ ((*_9).1: usize) = const 0_usize; // scope 3 at $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
+ StorageDead(_10); // scope 3 at $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
+ StorageDead(_9); // scope 0 at $DIR/inline-into-box-place.rs:+1:33: +1:43
+ Deinit((*_8)); // scope 3 at $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
+ ((*_8).0: alloc::raw_vec::RawVec<u32>) = move _9; // scope 3 at $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
+ ((*_8).1: usize) = const 0_usize; // scope 3 at $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
+ StorageDead(_9); // scope 3 at $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
+ StorageDead(_8); // scope 0 at $DIR/inline-into-box-place.rs:+1:33: +1:43
StorageDead(_7); // scope 0 at $DIR/inline-into-box-place.rs:+1:33: +1:43
_1 = move _5; // scope 0 at $DIR/inline-into-box-place.rs:+1:29: +1:43
StorageDead(_5); // scope 0 at $DIR/inline-into-box-place.rs:+1:42: +1:43
Expand Down
23 changes: 11 additions & 12 deletions src/test/mir-opt/inline/inline_into_box_place.main.Inline.64bit.diff
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Original file line number Diff line number Diff line change
Expand Up @@ -10,15 +10,14 @@
let mut _5: std::boxed::Box<std::vec::Vec<u32>>; // in scope 0 at $DIR/inline-into-box-place.rs:+1:29: +1:43
let mut _6: (); // in scope 0 at $DIR/inline-into-box-place.rs:+1:42: +1:43
let mut _7: *const std::vec::Vec<u32>; // in scope 0 at $DIR/inline-into-box-place.rs:+1:29: +1:43
let mut _8: *const std::vec::Vec<u32>; // in scope 0 at $DIR/inline-into-box-place.rs:+1:29: +1:43
+ let mut _9: &mut std::vec::Vec<u32>; // in scope 0 at $DIR/inline-into-box-place.rs:+1:33: +1:43
+ let mut _8: &mut std::vec::Vec<u32>; // in scope 0 at $DIR/inline-into-box-place.rs:+1:33: +1:43
scope 1 {
debug _x => _1; // in scope 1 at $DIR/inline-into-box-place.rs:+1:9: +1:11
}
scope 2 {
}
+ scope 3 (inlined Vec::<u32>::new) { // at $DIR/inline-into-box-place.rs:8:33: 8:43
+ let mut _10: alloc::raw_vec::RawVec<u32>; // in scope 3 at $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
+ let mut _9: alloc::raw_vec::RawVec<u32>; // in scope 3 at $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
+ }

bb0: {
Expand All @@ -37,10 +36,10 @@
StorageLive(_7); // scope 0 at $DIR/inline-into-box-place.rs:+1:33: +1:43
_7 = (((_5.0: std::ptr::Unique<std::vec::Vec<u32>>).0: std::ptr::NonNull<std::vec::Vec<u32>>).0: *const std::vec::Vec<u32>); // scope 0 at $DIR/inline-into-box-place.rs:+1:33: +1:43
- (*_7) = Vec::<u32>::new() -> [return: bb2, unwind: bb4]; // scope 0 at $DIR/inline-into-box-place.rs:+1:33: +1:43
+ StorageLive(_9); // scope 0 at $DIR/inline-into-box-place.rs:+1:33: +1:43
+ _9 = &mut (*_7); // scope 0 at $DIR/inline-into-box-place.rs:+1:33: +1:43
+ StorageLive(_10); // scope 3 at $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
+ _10 = const alloc::raw_vec::RawVec::<u32>::NEW; // scope 3 at $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
+ StorageLive(_8); // scope 0 at $DIR/inline-into-box-place.rs:+1:33: +1:43
+ _8 = &mut (*_7); // scope 0 at $DIR/inline-into-box-place.rs:+1:33: +1:43
+ StorageLive(_9); // scope 3 at $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
+ _9 = const alloc::raw_vec::RawVec::<u32>::NEW; // scope 3 at $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
// mir::Constant
- // + span: $DIR/inline-into-box-place.rs:8:33: 8:41
- // + user_ty: UserType(1)
Expand All @@ -51,11 +50,11 @@
+ // + span: $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
+ // + user_ty: UserType(0)
+ // + literal: Const { ty: alloc::raw_vec::RawVec<u32>, val: Unevaluated(alloc::raw_vec::RawVec::<T>::NEW, [u32], None) }
+ Deinit((*_9)); // scope 3 at $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
+ ((*_9).0: alloc::raw_vec::RawVec<u32>) = move _10; // scope 3 at $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
+ ((*_9).1: usize) = const 0_usize; // scope 3 at $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
+ StorageDead(_10); // scope 3 at $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
+ StorageDead(_9); // scope 0 at $DIR/inline-into-box-place.rs:+1:33: +1:43
+ Deinit((*_8)); // scope 3 at $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
+ ((*_8).0: alloc::raw_vec::RawVec<u32>) = move _9; // scope 3 at $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
+ ((*_8).1: usize) = const 0_usize; // scope 3 at $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
+ StorageDead(_9); // scope 3 at $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
+ StorageDead(_8); // scope 0 at $DIR/inline-into-box-place.rs:+1:33: +1:43
StorageDead(_7); // scope 0 at $DIR/inline-into-box-place.rs:+1:33: +1:43
_1 = move _5; // scope 0 at $DIR/inline-into-box-place.rs:+1:29: +1:43
StorageDead(_5); // scope 0 at $DIR/inline-into-box-place.rs:+1:42: +1:43
Expand Down

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