90 lines
2.4 KiB
Rust
90 lines
2.4 KiB
Rust
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// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#[repr(C)]
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#[derive(Copy, Clone)]
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struct SliceRepr {
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ptr: *const u8,
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len: usize,
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}
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#[repr(C)]
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#[derive(Copy, Clone)]
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struct BadSliceRepr {
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ptr: *const u8,
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len: &'static u8,
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}
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union SliceTransmute {
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repr: SliceRepr,
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bad: BadSliceRepr,
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slice: &'static [u8],
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str: &'static str,
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}
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#[repr(C)]
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#[derive(Copy, Clone)]
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struct DynRepr {
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ptr: *const u8,
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vtable: *const u8,
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}
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#[repr(C)]
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#[derive(Copy, Clone)]
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struct DynRepr2 {
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ptr: *const u8,
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vtable: *const u64,
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}
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#[repr(C)]
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#[derive(Copy, Clone)]
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struct BadDynRepr {
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ptr: *const u8,
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vtable: usize,
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}
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union DynTransmute {
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repr: DynRepr,
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repr2: DynRepr2,
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bad: BadDynRepr,
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rust: &'static Trait,
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}
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trait Trait {}
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// OK
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const A: &str = unsafe { SliceTransmute { repr: SliceRepr { ptr: &42, len: 1 } }.str};
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// should lint
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const B: &str = unsafe { SliceTransmute { repr: SliceRepr { ptr: &42, len: 999 } }.str};
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// bad
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const C: &str = unsafe { SliceTransmute { bad: BadSliceRepr { ptr: &42, len: &3 } }.str};
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//~^ ERROR this constant likely exhibits undefined behavior
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// OK
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const A2: &[u8] = unsafe { SliceTransmute { repr: SliceRepr { ptr: &42, len: 1 } }.slice};
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// should lint
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const B2: &[u8] = unsafe { SliceTransmute { repr: SliceRepr { ptr: &42, len: 999 } }.slice};
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// bad
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const C2: &[u8] = unsafe { SliceTransmute { bad: BadSliceRepr { ptr: &42, len: &3 } }.slice};
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//~^ ERROR this constant likely exhibits undefined behavior
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// bad
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const D: &Trait = unsafe { DynTransmute { repr: DynRepr { ptr: &92, vtable: &3 } }.rust};
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//~^ ERROR this constant likely exhibits undefined behavior
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// bad
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const E: &Trait = unsafe { DynTransmute { repr2: DynRepr2 { ptr: &92, vtable: &3 } }.rust};
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//~^ ERROR this constant likely exhibits undefined behavior
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// bad
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const F: &Trait = unsafe { DynTransmute { bad: BadDynRepr { ptr: &92, vtable: 3 } }.rust};
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//~^ ERROR this constant likely exhibits undefined behavior
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fn main() {
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}
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