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Add a repro example for not propagating constants of partially const initialized variables

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This commit is contained in:
Oliver Scherer 2020-05-12 12:55:55 +02:00
parent 09c817eeb2
commit c849a0d087
2 changed files with 69 additions and 0 deletions
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14
src/test/mir-opt/const_prop/mutable_variable_aggregate_partial_read.rs Normal file
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// compile-flags: -O
// EMIT_MIR rustc.main.ConstProp.diff
fn main() {
let mut x: (i32, i32) = foo();
x.1 = 99;
x.0 = 42;
let y = x.1;
}
#[inline(never)]
fn foo() -> (i32, i32) {
unimplemented!()
}

55
src/test/mir-opt/const_prop/mutable_variable_aggregate_partial_read/rustc.main.ConstProp.diff Normal file
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@ -0,0 +1,55 @@
- // MIR for `main` before ConstProp
+ // MIR for `main` after ConstProp
fn main() -> () {
let mut _0: (); // return place in scope 0 at $DIR/mutable_variable_aggregate_partial_read.rs:4:11: 4:11
let mut _1: (i32, i32) as UserTypeProjection { base: UserType(0), projs: [] }; // in scope 0 at $DIR/mutable_variable_aggregate_partial_read.rs:5:9: 5:14
scope 1 {
debug x => _1; // in scope 1 at $DIR/mutable_variable_aggregate_partial_read.rs:5:9: 5:14
let _2: i32; // in scope 1 at $DIR/mutable_variable_aggregate_partial_read.rs:8:9: 8:10
scope 2 {
debug y => _2; // in scope 2 at $DIR/mutable_variable_aggregate_partial_read.rs:8:9: 8:10
}
}
bb0: {
StorageLive(_1); // scope 0 at $DIR/mutable_variable_aggregate_partial_read.rs:5:9: 5:14
_1 = const foo() -> bb1; // scope 0 at $DIR/mutable_variable_aggregate_partial_read.rs:5:29: 5:34
// ty::Const
// + ty: fn() -> (i32, i32) {foo}
// + val: Value(Scalar(<ZST>))
// mir::Constant
// + span: $DIR/mutable_variable_aggregate_partial_read.rs:5:29: 5:32
// + literal: Const { ty: fn() -> (i32, i32) {foo}, val: Value(Scalar(<ZST>)) }
}
bb1: {
(_1.1: i32) = const 99i32; // scope 1 at $DIR/mutable_variable_aggregate_partial_read.rs:6:5: 6:13
// ty::Const
// + ty: i32
// + val: Value(Scalar(0x00000063))
// mir::Constant
// + span: $DIR/mutable_variable_aggregate_partial_read.rs:6:11: 6:13
// + literal: Const { ty: i32, val: Value(Scalar(0x00000063)) }
(_1.0: i32) = const 42i32; // scope 1 at $DIR/mutable_variable_aggregate_partial_read.rs:7:5: 7:13
// ty::Const
// + ty: i32
// + val: Value(Scalar(0x0000002a))
// mir::Constant
// + span: $DIR/mutable_variable_aggregate_partial_read.rs:7:11: 7:13
// + literal: Const { ty: i32, val: Value(Scalar(0x0000002a)) }
StorageLive(_2); // scope 1 at $DIR/mutable_variable_aggregate_partial_read.rs:8:9: 8:10
_2 = (_1.1: i32); // scope 1 at $DIR/mutable_variable_aggregate_partial_read.rs:8:13: 8:16
_0 = const (); // scope 0 at $DIR/mutable_variable_aggregate_partial_read.rs:4:11: 9:2
// ty::Const
// + ty: ()
// + val: Value(Scalar(<ZST>))
// mir::Constant
// + span: $DIR/mutable_variable_aggregate_partial_read.rs:4:11: 9:2
// + literal: Const { ty: (), val: Value(Scalar(<ZST>)) }
StorageDead(_2); // scope 1 at $DIR/mutable_variable_aggregate_partial_read.rs:9:1: 9:2
StorageDead(_1); // scope 0 at $DIR/mutable_variable_aggregate_partial_read.rs:9:1: 9:2
return; // scope 0 at $DIR/mutable_variable_aggregate_partial_read.rs:9:2: 9:2
}
}