4630d1b23b
Apparently MIR borrowck cares about at least one of these for checking variance. In runtime MIR, though, there's no need for them as `PtrToPtr` does the same thing. (Banning them simplifies passes like GVN that no longer need to handle multiple cast possibilities.)
122 lines
4.5 KiB
Diff
122 lines
4.5 KiB
Diff
- // MIR for `main` before GVN
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+ // MIR for `main` after GVN
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fn main() -> () {
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let mut _0: ();
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let _1: A;
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let mut _2: std::boxed::Box<[bool]>;
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scope 1 {
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debug a => _1;
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}
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scope 2 (inlined <Box<[bool]> as Default>::default) {
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let _3: std::ptr::Unique<[bool]>;
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let mut _4: std::ptr::Unique<[bool; 0]>;
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scope 3 {
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}
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scope 4 (inlined Unique::<[bool; 0]>::dangling) {
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let mut _5: std::ptr::NonNull<[bool; 0]>;
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scope 5 (inlined NonNull::<[bool; 0]>::dangling) {
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let _6: *mut [bool; 0];
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scope 6 {
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scope 10 (inlined NonNull::<[bool; 0]>::new_unchecked) {
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let mut _8: bool;
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let _9: ();
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let mut _10: *mut ();
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let mut _11: *const [bool; 0];
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scope 11 (inlined core::ub_checks::check_language_ub) {
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scope 12 (inlined core::ub_checks::check_language_ub::runtime) {
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}
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}
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}
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}
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scope 7 (inlined dangling_mut::<[bool; 0]>) {
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let mut _7: usize;
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scope 8 (inlined align_of::<[bool; 0]>) {
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}
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scope 9 (inlined without_provenance_mut::<[bool; 0]>) {
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}
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}
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}
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}
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}
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bb0: {
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StorageLive(_1);
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StorageLive(_2);
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StorageLive(_3);
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StorageLive(_9);
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StorageLive(_4);
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StorageLive(_5);
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StorageLive(_6);
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StorageLive(_7);
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- _7 = AlignOf([bool; 0]);
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- _6 = _7 as *mut [bool; 0] (Transmute);
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+ _7 = const 1_usize;
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+ _6 = const {0x1 as *mut [bool; 0]};
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StorageDead(_7);
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StorageLive(_11);
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StorageLive(_8);
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_8 = UbChecks();
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switchInt(move _8) -> [0: bb5, otherwise: bb3];
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}
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bb1: {
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StorageDead(_1);
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return;
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}
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bb2 (cleanup): {
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resume;
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}
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bb3: {
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StorageLive(_10);
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- _10 = _6 as *mut () (PtrToPtr);
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- _9 = NonNull::<T>::new_unchecked::precondition_check(move _10) -> [return: bb4, unwind unreachable];
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+ _10 = const {0x1 as *mut ()};
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+ _9 = NonNull::<T>::new_unchecked::precondition_check(const {0x1 as *mut ()}) -> [return: bb4, unwind unreachable];
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}
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bb4: {
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StorageDead(_10);
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goto -> bb5;
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}
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bb5: {
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StorageDead(_8);
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- _11 = _6 as *const [bool; 0] (PtrToPtr);
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- _5 = NonNull::<[bool; 0]> { pointer: _11 };
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+ _11 = const {0x1 as *const [bool; 0]};
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+ _5 = const NonNull::<[bool; 0]> {{ pointer: {0x1 as *const [bool; 0]} }};
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StorageDead(_11);
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StorageDead(_6);
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- _4 = Unique::<[bool; 0]> { pointer: move _5, _marker: const PhantomData::<[bool; 0]> };
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+ _4 = const Unique::<[bool; 0]> {{ pointer: NonNull::<[bool; 0]> {{ pointer: {0x1 as *const [bool; 0]} }}, _marker: PhantomData::<[bool; 0]> }};
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StorageDead(_5);
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- _3 = move _4 as std::ptr::Unique<[bool]> (PointerCoercion(Unsize));
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+ _3 = const Unique::<[bool]> {{ pointer: NonNull::<[bool]> {{ pointer: Indirect { alloc_id: ALLOC0, offset: Size(0 bytes) }: *const [bool] }}, _marker: PhantomData::<[bool]> }};
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StorageDead(_4);
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- _2 = Box::<[bool]>(_3, const std::alloc::Global);
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+ _2 = const Box::<[bool]>(Unique::<[bool]> {{ pointer: NonNull::<[bool]> {{ pointer: Indirect { alloc_id: ALLOC1, offset: Size(0 bytes) }: *const [bool] }}, _marker: PhantomData::<[bool]> }}, std::alloc::Global);
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StorageDead(_9);
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StorageDead(_3);
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- _1 = A { foo: move _2 };
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+ _1 = const A {{ foo: Box::<[bool]>(Unique::<[bool]> {{ pointer: NonNull::<[bool]> {{ pointer: Indirect { alloc_id: ALLOC2, offset: Size(0 bytes) }: *const [bool] }}, _marker: PhantomData::<[bool]> }}, std::alloc::Global) }};
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StorageDead(_2);
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_0 = const ();
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drop(_1) -> [return: bb1, unwind: bb2];
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}
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+ }
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+
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+ ALLOC2 (size: 16, align: 8) {
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+ 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 │ ................
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+ }
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+
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+ ALLOC1 (size: 16, align: 8) {
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+ 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 │ ................
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+ }
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+
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+ ALLOC0 (size: 16, align: 8) {
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+ 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 │ ................
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}
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