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Added MIR const-prop diff tests to show why some assertions now fail at compile-time
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‎src/test/mir-opt/const_prop/bad_op_div_by_zero.rs

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// EMIT_MIR rustc.main.ConstProp.diff
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#[allow(unconditional_panic)]
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fn main() {
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let y = 0;
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let _z = 1 / y;
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}

‎src/test/mir-opt/const_prop/bad_op_div_by_zero/rustc.main.ConstProp.diff

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- // MIR for `main` before ConstProp
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+ // MIR for `main` after ConstProp
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fn main() -> () {
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let mut _0: (); // return place in scope 0 at $DIR/bad_op_div_by_zero.rs:3:11: 3:11
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let _1: i32; // in scope 0 at $DIR/bad_op_div_by_zero.rs:4:9: 4:10
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let mut _3: i32; // in scope 0 at $DIR/bad_op_div_by_zero.rs:5:18: 5:19
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let mut _4: bool; // in scope 0 at $DIR/bad_op_div_by_zero.rs:5:14: 5:19
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let mut _5: bool; // in scope 0 at $DIR/bad_op_div_by_zero.rs:5:14: 5:19
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let mut _6: bool; // in scope 0 at $DIR/bad_op_div_by_zero.rs:5:14: 5:19
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let mut _7: bool; // in scope 0 at $DIR/bad_op_div_by_zero.rs:5:14: 5:19
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scope 1 {
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debug y => _1; // in scope 1 at $DIR/bad_op_div_by_zero.rs:4:9: 4:10
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let _2: i32; // in scope 1 at $DIR/bad_op_div_by_zero.rs:5:9: 5:11
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scope 2 {
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debug _z => _2; // in scope 2 at $DIR/bad_op_div_by_zero.rs:5:9: 5:11
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}
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}
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bb0: {
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StorageLive(_1); // scope 0 at $DIR/bad_op_div_by_zero.rs:4:9: 4:10
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_1 = const 0i32; // scope 0 at $DIR/bad_op_div_by_zero.rs:4:13: 4:14
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// ty::Const
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// + ty: i32
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// + val: Value(Scalar(0x00000000))
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// mir::Constant
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// + span: $DIR/bad_op_div_by_zero.rs:4:13: 4:14
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// + literal: Const { ty: i32, val: Value(Scalar(0x00000000)) }
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StorageLive(_2); // scope 1 at $DIR/bad_op_div_by_zero.rs:5:9: 5:11
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StorageLive(_3); // scope 1 at $DIR/bad_op_div_by_zero.rs:5:18: 5:19
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- _3 = _1; // scope 1 at $DIR/bad_op_div_by_zero.rs:5:18: 5:19
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- _4 = Eq(_3, const 0i32); // scope 1 at $DIR/bad_op_div_by_zero.rs:5:14: 5:19
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+ _3 = const 0i32; // scope 1 at $DIR/bad_op_div_by_zero.rs:5:18: 5:19
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// ty::Const
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// + ty: i32
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// + val: Value(Scalar(0x00000000))
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// mir::Constant
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- // + span: $DIR/bad_op_div_by_zero.rs:5:14: 5:19
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+ // + span: $DIR/bad_op_div_by_zero.rs:5:18: 5:19
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// + literal: Const { ty: i32, val: Value(Scalar(0x00000000)) }
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+ _4 = const true; // scope 1 at $DIR/bad_op_div_by_zero.rs:5:14: 5:19
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+ // ty::Const
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+ // + ty: bool
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+ // + val: Value(Scalar(0x01))
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+ // mir::Constant
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+ // + span: $DIR/bad_op_div_by_zero.rs:5:14: 5:19
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+ // + literal: Const { ty: bool, val: Value(Scalar(0x01)) }
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assert(!move _4, "attempt to divide by zero") -> bb1; // scope 1 at $DIR/bad_op_div_by_zero.rs:5:14: 5:19
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}
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bb1: {
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- _5 = Eq(_3, const -1i32); // scope 1 at $DIR/bad_op_div_by_zero.rs:5:14: 5:19
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+ _5 = const false; // scope 1 at $DIR/bad_op_div_by_zero.rs:5:14: 5:19
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// ty::Const
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- // + ty: i32
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- // + val: Value(Scalar(0xffffffff))
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+ // + ty: bool
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+ // + val: Value(Scalar(0x00))
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// mir::Constant
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// + span: $DIR/bad_op_div_by_zero.rs:5:14: 5:19
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- // + literal: Const { ty: i32, val: Value(Scalar(0xffffffff)) }
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- _6 = Eq(const 1i32, const std::i32::MIN); // scope 1 at $DIR/bad_op_div_by_zero.rs:5:14: 5:19
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+ // + literal: Const { ty: bool, val: Value(Scalar(0x00)) }
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+ _6 = const false; // scope 1 at $DIR/bad_op_div_by_zero.rs:5:14: 5:19
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// ty::Const
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- // + ty: i32
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- // + val: Value(Scalar(0x00000001))
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+ // + ty: bool
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+ // + val: Value(Scalar(0x00))
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// mir::Constant
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- // + span: $DIR/bad_op_div_by_zero.rs:5:14: 5:15
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- // + literal: Const { ty: i32, val: Value(Scalar(0x00000001)) }
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+ // + span: $DIR/bad_op_div_by_zero.rs:5:14: 5:19
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+ // + literal: Const { ty: bool, val: Value(Scalar(0x00)) }
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+ _7 = const false; // scope 1 at $DIR/bad_op_div_by_zero.rs:5:14: 5:19
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// ty::Const
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- // + ty: i32
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- // + val: Value(Scalar(0x80000000))
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+ // + ty: bool
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+ // + val: Value(Scalar(0x00))
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// mir::Constant
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// + span: $DIR/bad_op_div_by_zero.rs:5:14: 5:19
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- // + literal: Const { ty: i32, val: Value(Scalar(0x80000000)) }
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- _7 = BitAnd(move _5, move _6); // scope 1 at $DIR/bad_op_div_by_zero.rs:5:14: 5:19
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- assert(!move _7, "attempt to divide with overflow") -> bb2; // scope 1 at $DIR/bad_op_div_by_zero.rs:5:14: 5:19
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+ // + literal: Const { ty: bool, val: Value(Scalar(0x00)) }
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+ assert(!const false, "attempt to divide with overflow") -> bb2; // scope 1 at $DIR/bad_op_div_by_zero.rs:5:14: 5:19
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+ // ty::Const
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+ // + ty: bool
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+ // + val: Value(Scalar(0x00))
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+ // mir::Constant
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+ // + span: $DIR/bad_op_div_by_zero.rs:5:14: 5:19
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+ // + literal: Const { ty: bool, val: Value(Scalar(0x00)) }
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}
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bb2: {
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_2 = Div(const 1i32, move _3); // scope 1 at $DIR/bad_op_div_by_zero.rs:5:14: 5:19
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// ty::Const
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// + ty: i32
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// + val: Value(Scalar(0x00000001))
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// mir::Constant
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// + span: $DIR/bad_op_div_by_zero.rs:5:14: 5:15
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// + literal: Const { ty: i32, val: Value(Scalar(0x00000001)) }
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StorageDead(_3); // scope 1 at $DIR/bad_op_div_by_zero.rs:5:18: 5:19
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_0 = const (); // scope 0 at $DIR/bad_op_div_by_zero.rs:3:11: 6:2
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// ty::Const
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// + ty: ()
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// + val: Value(Scalar(<ZST>))
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// mir::Constant
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// + span: $DIR/bad_op_div_by_zero.rs:3:11: 6:2
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// + literal: Const { ty: (), val: Value(Scalar(<ZST>)) }
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StorageDead(_2); // scope 1 at $DIR/bad_op_div_by_zero.rs:6:1: 6:2
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StorageDead(_1); // scope 0 at $DIR/bad_op_div_by_zero.rs:6:1: 6:2
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return; // scope 0 at $DIR/bad_op_div_by_zero.rs:6:2: 6:2
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}
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}
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‎src/test/mir-opt/const_prop/bad_op_mod_by_zero.rs

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// EMIT_MIR rustc.main.ConstProp.diff
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#[allow(unconditional_panic)]
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fn main() {
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let y = 0;
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let _z = 1 % y;
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}

‎src/test/mir-opt/const_prop/bad_op_mod_by_zero/rustc.main.ConstProp.diff

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- // MIR for `main` before ConstProp
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+ // MIR for `main` after ConstProp
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fn main() -> () {
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let mut _0: (); // return place in scope 0 at $DIR/bad_op_mod_by_zero.rs:3:11: 3:11
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let _1: i32; // in scope 0 at $DIR/bad_op_mod_by_zero.rs:4:9: 4:10
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let mut _3: i32; // in scope 0 at $DIR/bad_op_mod_by_zero.rs:5:18: 5:19
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let mut _4: bool; // in scope 0 at $DIR/bad_op_mod_by_zero.rs:5:14: 5:19
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let mut _5: bool; // in scope 0 at $DIR/bad_op_mod_by_zero.rs:5:14: 5:19
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let mut _6: bool; // in scope 0 at $DIR/bad_op_mod_by_zero.rs:5:14: 5:19
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let mut _7: bool; // in scope 0 at $DIR/bad_op_mod_by_zero.rs:5:14: 5:19
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scope 1 {
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debug y => _1; // in scope 1 at $DIR/bad_op_mod_by_zero.rs:4:9: 4:10
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let _2: i32; // in scope 1 at $DIR/bad_op_mod_by_zero.rs:5:9: 5:11
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scope 2 {
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debug _z => _2; // in scope 2 at $DIR/bad_op_mod_by_zero.rs:5:9: 5:11
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}
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}
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bb0: {
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StorageLive(_1); // scope 0 at $DIR/bad_op_mod_by_zero.rs:4:9: 4:10
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_1 = const 0i32; // scope 0 at $DIR/bad_op_mod_by_zero.rs:4:13: 4:14
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// ty::Const
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// + ty: i32
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// + val: Value(Scalar(0x00000000))
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// mir::Constant
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// + span: $DIR/bad_op_mod_by_zero.rs:4:13: 4:14
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// + literal: Const { ty: i32, val: Value(Scalar(0x00000000)) }
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StorageLive(_2); // scope 1 at $DIR/bad_op_mod_by_zero.rs:5:9: 5:11
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StorageLive(_3); // scope 1 at $DIR/bad_op_mod_by_zero.rs:5:18: 5:19
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- _3 = _1; // scope 1 at $DIR/bad_op_mod_by_zero.rs:5:18: 5:19
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- _4 = Eq(_3, const 0i32); // scope 1 at $DIR/bad_op_mod_by_zero.rs:5:14: 5:19
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+ _3 = const 0i32; // scope 1 at $DIR/bad_op_mod_by_zero.rs:5:18: 5:19
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// ty::Const
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// + ty: i32
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// + val: Value(Scalar(0x00000000))
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// mir::Constant
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- // + span: $DIR/bad_op_mod_by_zero.rs:5:14: 5:19
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+ // + span: $DIR/bad_op_mod_by_zero.rs:5:18: 5:19
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// + literal: Const { ty: i32, val: Value(Scalar(0x00000000)) }
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+ _4 = const true; // scope 1 at $DIR/bad_op_mod_by_zero.rs:5:14: 5:19
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+ // ty::Const
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+ // + ty: bool
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+ // + val: Value(Scalar(0x01))
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+ // mir::Constant
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+ // + span: $DIR/bad_op_mod_by_zero.rs:5:14: 5:19
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+ // + literal: Const { ty: bool, val: Value(Scalar(0x01)) }
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assert(!move _4, "attempt to calculate the remainder with a divisor of zero") -> bb1; // scope 1 at $DIR/bad_op_mod_by_zero.rs:5:14: 5:19
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}
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bb1: {
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- _5 = Eq(_3, const -1i32); // scope 1 at $DIR/bad_op_mod_by_zero.rs:5:14: 5:19
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+ _5 = const false; // scope 1 at $DIR/bad_op_mod_by_zero.rs:5:14: 5:19
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// ty::Const
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- // + ty: i32
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- // + val: Value(Scalar(0xffffffff))
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+ // + ty: bool
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+ // + val: Value(Scalar(0x00))
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// mir::Constant
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// + span: $DIR/bad_op_mod_by_zero.rs:5:14: 5:19
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- // + literal: Const { ty: i32, val: Value(Scalar(0xffffffff)) }
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- _6 = Eq(const 1i32, const std::i32::MIN); // scope 1 at $DIR/bad_op_mod_by_zero.rs:5:14: 5:19
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+ // + literal: Const { ty: bool, val: Value(Scalar(0x00)) }
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+ _6 = const false; // scope 1 at $DIR/bad_op_mod_by_zero.rs:5:14: 5:19
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// ty::Const
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- // + ty: i32
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- // + val: Value(Scalar(0x00000001))
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+ // + ty: bool
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+ // + val: Value(Scalar(0x00))
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// mir::Constant
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- // + span: $DIR/bad_op_mod_by_zero.rs:5:14: 5:15
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- // + literal: Const { ty: i32, val: Value(Scalar(0x00000001)) }
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+ // + span: $DIR/bad_op_mod_by_zero.rs:5:14: 5:19
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+ // + literal: Const { ty: bool, val: Value(Scalar(0x00)) }
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+ _7 = const false; // scope 1 at $DIR/bad_op_mod_by_zero.rs:5:14: 5:19
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// ty::Const
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- // + ty: i32
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- // + val: Value(Scalar(0x80000000))
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+ // + ty: bool
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+ // + val: Value(Scalar(0x00))
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// mir::Constant
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// + span: $DIR/bad_op_mod_by_zero.rs:5:14: 5:19
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- // + literal: Const { ty: i32, val: Value(Scalar(0x80000000)) }
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- _7 = BitAnd(move _5, move _6); // scope 1 at $DIR/bad_op_mod_by_zero.rs:5:14: 5:19
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- assert(!move _7, "attempt to calculate the remainder with overflow") -> bb2; // scope 1 at $DIR/bad_op_mod_by_zero.rs:5:14: 5:19
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+ // + literal: Const { ty: bool, val: Value(Scalar(0x00)) }
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+ assert(!const false, "attempt to calculate the remainder with overflow") -> bb2; // scope 1 at $DIR/bad_op_mod_by_zero.rs:5:14: 5:19
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+ // ty::Const
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+ // + ty: bool
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+ // + val: Value(Scalar(0x00))
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+ // mir::Constant
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+ // + span: $DIR/bad_op_mod_by_zero.rs:5:14: 5:19
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+ // + literal: Const { ty: bool, val: Value(Scalar(0x00)) }
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}
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bb2: {
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_2 = Rem(const 1i32, move _3); // scope 1 at $DIR/bad_op_mod_by_zero.rs:5:14: 5:19
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// ty::Const
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// + ty: i32
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// + val: Value(Scalar(0x00000001))
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// mir::Constant
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// + span: $DIR/bad_op_mod_by_zero.rs:5:14: 5:15
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// + literal: Const { ty: i32, val: Value(Scalar(0x00000001)) }
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StorageDead(_3); // scope 1 at $DIR/bad_op_mod_by_zero.rs:5:18: 5:19
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_0 = const (); // scope 0 at $DIR/bad_op_mod_by_zero.rs:3:11: 6:2
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// ty::Const
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// + ty: ()
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// + val: Value(Scalar(<ZST>))
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// mir::Constant
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// + span: $DIR/bad_op_mod_by_zero.rs:3:11: 6:2
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// + literal: Const { ty: (), val: Value(Scalar(<ZST>)) }
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StorageDead(_2); // scope 1 at $DIR/bad_op_mod_by_zero.rs:6:1: 6:2
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StorageDead(_1); // scope 0 at $DIR/bad_op_mod_by_zero.rs:6:1: 6:2
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return; // scope 0 at $DIR/bad_op_mod_by_zero.rs:6:2: 6:2
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}
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}
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‎src/test/mir-opt/const_prop/bad_op_unsafe_oob_for_slices.rs

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// EMIT_MIR_FOR_EACH_BIT_WIDTH
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// EMIT_MIR rustc.main.ConstProp.diff
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#[allow(unconditional_panic)]
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fn main() {
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let a: *const [_] = &[1, 2, 3];
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unsafe {
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let _b = (*a)[3];
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}
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}

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