ef1831a21f
State transforms retains storage statements for locals that are not stored inside a coroutine. It ensures those locals are live when resuming by inserting StorageLive as appropriate. It forgot to end the storage of those locals when suspending, which is fixed here. While the end of live range is implicit when executing return, it is nevertheless useful for inliner which would otherwise extend the live range beyond return.
90 lines
2.1 KiB
Rust
90 lines
2.1 KiB
Rust
// MIR for `main::{closure#0}` 0 coroutine_resume
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/* coroutine_layout = CoroutineLayout {
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field_tys: {
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_0: CoroutineSavedTy {
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ty: HasDrop,
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source_info: SourceInfo {
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span: $DIR/coroutine_tiny.rs:21:13: 21:15 (#0),
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scope: scope[0],
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},
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ignore_for_traits: false,
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},
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},
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variant_fields: {
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Unresumed(0): [],
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Returned (1): [],
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Panicked (2): [],
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Suspend0 (3): [_0],
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},
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storage_conflicts: BitMatrix(1x1) {
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(_0, _0),
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},
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} */
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fn main::{closure#0}(_1: Pin<&mut {coroutine@$DIR/coroutine_tiny.rs:20:16: 20:24}>, _2: u8) -> CoroutineState<(), ()> {
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debug _x => _10;
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let mut _0: std::ops::CoroutineState<(), ()>;
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let _3: HasDrop;
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let mut _4: !;
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let mut _5: ();
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let _6: u8;
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let mut _7: ();
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let _8: ();
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let mut _9: ();
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let _10: u8;
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let mut _11: u32;
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scope 1 {
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debug _d => (((*(_1.0: &mut {coroutine@$DIR/coroutine_tiny.rs:20:16: 20:24})) as variant#3).0: HasDrop);
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}
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bb0: {
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_11 = discriminant((*(_1.0: &mut {coroutine@$DIR/coroutine_tiny.rs:20:16: 20:24})));
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switchInt(move _11) -> [0: bb1, 3: bb5, otherwise: bb6];
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}
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bb1: {
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_10 = move _2;
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nop;
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(((*(_1.0: &mut {coroutine@$DIR/coroutine_tiny.rs:20:16: 20:24})) as variant#3).0: HasDrop) = HasDrop;
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StorageLive(_4);
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goto -> bb2;
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}
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bb2: {
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StorageLive(_6);
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StorageLive(_7);
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_7 = ();
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_0 = CoroutineState::<(), ()>::Yielded(move _7);
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StorageDead(_4);
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StorageDead(_6);
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StorageDead(_7);
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discriminant((*(_1.0: &mut {coroutine@$DIR/coroutine_tiny.rs:20:16: 20:24}))) = 3;
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return;
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}
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bb3: {
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StorageDead(_7);
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StorageDead(_6);
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StorageLive(_8);
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_8 = callee() -> [return: bb4, unwind unreachable];
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}
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bb4: {
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StorageDead(_8);
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_5 = const ();
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goto -> bb2;
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}
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bb5: {
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StorageLive(_4);
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StorageLive(_6);
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StorageLive(_7);
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_6 = move _2;
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goto -> bb3;
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}
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bb6: {
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unreachable;
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}
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}
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