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Add a test for match scopes
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Matthew Jasper
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src/test/mir-opt/match-arm-scopes.rs
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245
src/test/mir-opt/match-arm-scopes.rs
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// Test that StorageDead and Drops are generated properly for bindings in
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// matches:
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// * The MIR should only contain a single drop of `s` and `t`: at the end
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// of their respective arms.
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// * StorageDead and StorageLive statements are correctly matched up on
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// non-unwind paths.
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// * The visibility scopes of the match arms should be disjoint, and contain.
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// all of the bindings for that scope.
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// * No drop flags are used.
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#![feature(nll, bind_by_move_pattern_guards)]
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fn complicated_match(cond: bool, items: (bool, bool, String)) -> i32 {
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match items {
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(false, a, s) | (a, false, s) if if cond { return 3 } else { a } => 1,
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(true, b, t) | (false, b, t) => 2,
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}
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}
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const CASES: &[(bool, bool, bool, i32)] = &[
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(false, false, false, 2),
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(false, false, true, 1),
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(false, true, false, 1),
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(false, true, true, 2),
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(true, false, false, 3),
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(true, false, true, 3),
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(true, true, false, 3),
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(true, true, true, 2),
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];
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fn main() {
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for &(cond, items_1, items_2, result) in CASES {
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assert_eq!(
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complicated_match(cond, (items_1, items_2, String::new())),
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result,
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);
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}
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}
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// END RUST SOURCE
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// START rustc.complicated_match.SimplifyCfg-initial.after.mir
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// let mut _0: i32;
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// let mut _3: &bool; // Temp for fake borrow of `items.0`
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// let mut _4: &bool; // Temp for fake borrow of `items.1`
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// let _5: bool; // `a` in arm
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// let _6: &bool; // `a` in guard
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// let _7: std::string::String; // `s` in arm
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// let _8: &std::string::String; // `s` in guard
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// let mut _9: bool; // `if cond { return 3 } else { a }`
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// let mut _10: bool; // `cond`
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// let mut _11: !; // `return 3`
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// let mut _12: bool; // `if cond { return 3 } else { a }`
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// let mut _13: bool; // `cond`
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// let mut _14: !; // `return 3`
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// let _15: bool; // `b`
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// let _16: std::string::String; // `t`
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// scope 1 {
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// }
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// scope 2 {
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// }
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// bb0: {
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// FakeRead(ForMatchedPlace, _2);
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// switchInt((_2.0: bool)) -> [false: bb2, otherwise: bb7];
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// }
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// bb1 (cleanup): {
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// resume;
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// }
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// bb2: {
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// falseEdges -> [real: bb10, imaginary: bb3];
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// }
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// bb3: {
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// falseEdges -> [real: bb21, imaginary: bb4];
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// }
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// bb4: {
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// falseEdges -> [real: bb31, imaginary: bb5];
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// }
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// bb5: {
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// falseEdges -> [real: bb32, imaginary: bb6];
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// }
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// bb6: {
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// unreachable;
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// }
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// bb7: {
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// switchInt((_2.1: bool)) -> [false: bb3, otherwise: bb8];
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// }
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// bb8: {
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// switchInt((_2.0: bool)) -> [false: bb5, otherwise: bb4];
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// }
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// bb9: { // arm 1
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// _0 = const 1i32;
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// drop(_7) -> [return: bb29, unwind: bb16];
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// }
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// bb10: { // guard - first time
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// StorageLive(_6);
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// _6 = &(_2.1: bool);
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// StorageLive(_8);
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// _8 = &(_2.2: std::string::String);
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// _3 = &shallow (_2.0: bool);
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// _4 = &shallow (_2.1: bool);
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// StorageLive(_9);
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// StorageLive(_10);
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// _10 = _1;
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// FakeRead(ForMatchedPlace, _10);
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// switchInt(_10) -> [false: bb12, otherwise: bb11];
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// }
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// bb11: {
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// falseEdges -> [real: bb14, imaginary: bb12];
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// }
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// bb12: {
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// falseEdges -> [real: bb18, imaginary: bb13];
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// }
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// bb13: {
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// unreachable;
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// }
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// bb14: { // `return 3` - first time
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// _0 = const 3i32;
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// StorageDead(_10);
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// StorageDead(_9);
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// StorageDead(_8);
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// StorageDead(_6);
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// goto -> bb17;
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// }
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// bb15: {
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// return;
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// }
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// bb16 (cleanup): {
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// drop(_2) -> bb1;
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// }
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// bb17: {
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// drop(_2) -> [return: bb15, unwind: bb1];
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// }
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// bb18: { // `else` block - first time
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// _9 = (*_6);
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// StorageDead(_10);
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// FakeRead(ForMatchGuard, _3);
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// FakeRead(ForMatchGuard, _4);
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// FakeRead(ForGuardBinding, _6);
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// FakeRead(ForGuardBinding, _8);
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// switchInt(move _9) -> [false: bb20, otherwise: bb19];
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// }
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// bb19: {
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// StorageDead(_9);
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// StorageLive(_5);
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// _5 = (_2.1: bool);
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// StorageLive(_7);
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// _7 = move (_2.2: std::string::String);
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// goto -> bb9;
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// }
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// bb20: { // guard otherwise case - first time
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// StorageDead(_9);
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// StorageDead(_8);
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// StorageDead(_6);
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// falseEdges -> [real: bb7, imaginary: bb3];
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// }
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// bb21: { // guard - second time
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// StorageLive(_6);
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// _6 = &(_2.0: bool);
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// StorageLive(_8);
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// _8 = &(_2.2: std::string::String);
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// _3 = &shallow (_2.0: bool);
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// _4 = &shallow (_2.1: bool);
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// StorageLive(_12);
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// StorageLive(_13);
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// _13 = _1;
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// FakeRead(ForMatchedPlace, _13);
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// switchInt(_13) -> [false: bb23, otherwise: bb22];
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// }
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// bb22: {
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// falseEdges -> [real: bb25, imaginary: bb23];
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// }
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// bb23: {
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// falseEdges -> [real: bb26, imaginary: bb24];
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// }
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// bb24: {
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// unreachable;
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// }
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// bb25: { // `return 3` - second time
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// _0 = const 3i32;
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// StorageDead(_13);
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// StorageDead(_12);
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// StorageDead(_8);
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// StorageDead(_6);
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// goto -> bb17;
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// }
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// bb26: { // `else` block - second time
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// _12 = (*_6);
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// StorageDead(_13);
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// FakeRead(ForMatchGuard, _3);
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// FakeRead(ForMatchGuard, _4);
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// FakeRead(ForGuardBinding, _6);
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// FakeRead(ForGuardBinding, _8);
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// switchInt(move _12) -> [false: bb28, otherwise: bb27];
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// }
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// bb27: { // Guard otherwise case - second time
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// StorageDead(_12);
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// StorageLive(_5);
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// _5 = (_2.0: bool);
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// StorageLive(_7);
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// _7 = move (_2.2: std::string::String);
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// goto -> bb9;
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// }
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// bb28: { // rest of arm 1
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// StorageDead(_12);
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// StorageDead(_8);
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// StorageDead(_6);
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// falseEdges -> [real: bb8, imaginary: bb4];
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// }
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// bb29: {
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// StorageDead(_7);
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// StorageDead(_5);
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// StorageDead(_8);
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// StorageDead(_6);
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// goto -> bb34;
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// }
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// bb30: { // arm 2
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// _0 = const 2i32;
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// drop(_16) -> [return: bb33, unwind: bb16];
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// }
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// bb31: { // bindings for arm 2 - first pattern
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// StorageLive(_15);
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// _15 = (_2.1: bool);
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// StorageLive(_16);
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// _16 = move (_2.2: std::string::String);
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// goto -> bb30;
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// }
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// bb32: { // bindings for arm 2 - first pattern
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// StorageLive(_15);
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// _15 = (_2.1: bool);
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// StorageLive(_16);
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// _16 = move (_2.2: std::string::String);
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// goto -> bb30;
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// }
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// bb33: { // rest of arm 2
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// StorageDead(_16);
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// StorageDead(_15);
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// goto -> bb34;
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// }
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// bb34: { // end of match
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// drop(_2) -> [return: bb15, unwind: bb1];
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// }
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// END rustc.complicated_match.SimplifyCfg-initial.after.mir
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// START rustc.complicated_match.ElaborateDrops.after.mir
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// let _16: std::string::String; // No drop flags, which would come after this.
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// scope 1 {
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// END rustc.complicated_match.ElaborateDrops.after.mir
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