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Add tests for Stacked Borrows behavior

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This commit is contained in:
Jannis Christopher Köhl 2022-10-07 01:11:06 +02:00
parent 3c0f3b04b5
commit 7a52e7350e
4 changed files with 120 additions and 0 deletions
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46
src/test/mir-opt/dataflow-const-prop/ref_with_sb.main.DataflowConstProp.diff Normal file
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@ -0,0 +1,46 @@
- // MIR for `main` before DataflowConstProp
+ // MIR for `main` after DataflowConstProp
fn main() -> () {
let mut _0: (); // return place in scope 0 at $DIR/ref_with_sb.rs:+0:11: +0:11
let mut _1: i32; // in scope 0 at $DIR/ref_with_sb.rs:+1:9: +1:14
let _2: (); // in scope 0 at $DIR/ref_with_sb.rs:+2:5: +2:15
let mut _3: &i32; // in scope 0 at $DIR/ref_with_sb.rs:+2:12: +2:14
let _4: &i32; // in scope 0 at $DIR/ref_with_sb.rs:+2:12: +2:14
scope 1 {
debug a => _1; // in scope 1 at $DIR/ref_with_sb.rs:+1:9: +1:14
let _5: i32; // in scope 1 at $DIR/ref_with_sb.rs:+6:9: +6:10
scope 2 {
debug b => _5; // in scope 2 at $DIR/ref_with_sb.rs:+6:9: +6:10
}
}
bb0: {
StorageLive(_1); // scope 0 at $DIR/ref_with_sb.rs:+1:9: +1:14
_1 = const 0_i32; // scope 0 at $DIR/ref_with_sb.rs:+1:17: +1:18
StorageLive(_2); // scope 1 at $DIR/ref_with_sb.rs:+2:5: +2:15
StorageLive(_3); // scope 1 at $DIR/ref_with_sb.rs:+2:12: +2:14
StorageLive(_4); // scope 1 at $DIR/ref_with_sb.rs:+2:12: +2:14
_4 = &_1; // scope 1 at $DIR/ref_with_sb.rs:+2:12: +2:14
_3 = &(*_4); // scope 1 at $DIR/ref_with_sb.rs:+2:12: +2:14
_2 = escape::<i32>(move _3) -> bb1; // scope 1 at $DIR/ref_with_sb.rs:+2:5: +2:15
// mir::Constant
// + span: $DIR/ref_with_sb.rs:10:5: 10:11
// + literal: Const { ty: for<'a> fn(&'a i32) {escape::<i32>}, val: Value(<ZST>) }
}
bb1: {
StorageDead(_3); // scope 1 at $DIR/ref_with_sb.rs:+2:14: +2:15
StorageDead(_4); // scope 1 at $DIR/ref_with_sb.rs:+2:15: +2:16
StorageDead(_2); // scope 1 at $DIR/ref_with_sb.rs:+2:15: +2:16
_1 = const 1_i32; // scope 1 at $DIR/ref_with_sb.rs:+3:5: +3:10
StorageLive(_5); // scope 1 at $DIR/ref_with_sb.rs:+6:9: +6:10
- _5 = _1; // scope 1 at $DIR/ref_with_sb.rs:+6:13: +6:14
+ _5 = const 1_i32; // scope 1 at $DIR/ref_with_sb.rs:+6:13: +6:14
_0 = const (); // scope 0 at $DIR/ref_with_sb.rs:+0:11: +7:2
StorageDead(_5); // scope 1 at $DIR/ref_with_sb.rs:+7:1: +7:2
StorageDead(_1); // scope 0 at $DIR/ref_with_sb.rs:+7:1: +7:2
return; // scope 0 at $DIR/ref_with_sb.rs:+7:2: +7:2
}
}

15
src/test/mir-opt/dataflow-const-prop/ref_with_sb.rs Normal file
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@ -0,0 +1,15 @@
// unit-test: DataflowConstProp
// compile-flags: -Zunsound-mir-opts
#[inline(never)]
fn escape<T>(x: &T) {}
// EMIT_MIR ref_with_sb.main.DataflowConstProp.diff
fn main() {
let mut a = 0;
escape(&a);
a = 1;
// With `-Zunsound-mir-opt`, this should be propagated
// (because we assume Stacked Borrows).
let b = a;
}

45
src/test/mir-opt/dataflow-const-prop/ref_without_sb.main.DataflowConstProp.diff Normal file
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@ -0,0 +1,45 @@
- // MIR for `main` before DataflowConstProp
+ // MIR for `main` after DataflowConstProp
fn main() -> () {
let mut _0: (); // return place in scope 0 at $DIR/ref_without_sb.rs:+0:11: +0:11
let mut _1: i32; // in scope 0 at $DIR/ref_without_sb.rs:+1:9: +1:14
let _2: (); // in scope 0 at $DIR/ref_without_sb.rs:+2:5: +2:15
let mut _3: &i32; // in scope 0 at $DIR/ref_without_sb.rs:+2:12: +2:14
let _4: &i32; // in scope 0 at $DIR/ref_without_sb.rs:+2:12: +2:14
scope 1 {
debug a => _1; // in scope 1 at $DIR/ref_without_sb.rs:+1:9: +1:14
let _5: i32; // in scope 1 at $DIR/ref_without_sb.rs:+6:9: +6:10
scope 2 {
debug b => _5; // in scope 2 at $DIR/ref_without_sb.rs:+6:9: +6:10
}
}
bb0: {
StorageLive(_1); // scope 0 at $DIR/ref_without_sb.rs:+1:9: +1:14
_1 = const 0_i32; // scope 0 at $DIR/ref_without_sb.rs:+1:17: +1:18
StorageLive(_2); // scope 1 at $DIR/ref_without_sb.rs:+2:5: +2:15
StorageLive(_3); // scope 1 at $DIR/ref_without_sb.rs:+2:12: +2:14
StorageLive(_4); // scope 1 at $DIR/ref_without_sb.rs:+2:12: +2:14
_4 = &_1; // scope 1 at $DIR/ref_without_sb.rs:+2:12: +2:14
_3 = &(*_4); // scope 1 at $DIR/ref_without_sb.rs:+2:12: +2:14
_2 = escape::<i32>(move _3) -> bb1; // scope 1 at $DIR/ref_without_sb.rs:+2:5: +2:15
// mir::Constant
// + span: $DIR/ref_without_sb.rs:9:5: 9:11
// + literal: Const { ty: for<'a> fn(&'a i32) {escape::<i32>}, val: Value(<ZST>) }
}
bb1: {
StorageDead(_3); // scope 1 at $DIR/ref_without_sb.rs:+2:14: +2:15
StorageDead(_4); // scope 1 at $DIR/ref_without_sb.rs:+2:15: +2:16
StorageDead(_2); // scope 1 at $DIR/ref_without_sb.rs:+2:15: +2:16
_1 = const 1_i32; // scope 1 at $DIR/ref_without_sb.rs:+3:5: +3:10
StorageLive(_5); // scope 1 at $DIR/ref_without_sb.rs:+6:9: +6:10
_5 = _1; // scope 1 at $DIR/ref_without_sb.rs:+6:13: +6:14
_0 = const (); // scope 0 at $DIR/ref_without_sb.rs:+0:11: +7:2
StorageDead(_5); // scope 1 at $DIR/ref_without_sb.rs:+7:1: +7:2
StorageDead(_1); // scope 0 at $DIR/ref_without_sb.rs:+7:1: +7:2
return; // scope 0 at $DIR/ref_without_sb.rs:+7:2: +7:2
}
}

14
src/test/mir-opt/dataflow-const-prop/ref_without_sb.rs Normal file
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@ -0,0 +1,14 @@
// unit-test: DataflowConstProp
#[inline(never)]
fn escape<T>(x: &T) {}
// EMIT_MIR ref_without_sb.main.DataflowConstProp.diff
fn main() {
let mut a = 0;
escape(&a);
a = 1;
// Without `-Zunsound-mir-opt`, this should not be propagated
// (because we do not assume Stacked Borrows).
let b = a;
}