rust/src/test/ui/union-ub-fat-ptr.rs

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// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
#![allow(unused)]
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// normalize-stderr-test "alignment \d+" -> "alignment N"
// normalize-stderr-test "offset \d+" -> "offset N"
// normalize-stderr-test "allocation \d+" -> "allocation N"
// normalize-stderr-test "size \d+" -> "size N"
union BoolTransmute {
val: u8,
bl: bool,
}
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#[repr(C)]
#[derive(Copy, Clone)]
struct SliceRepr {
ptr: *const u8,
len: usize,
}
#[repr(C)]
#[derive(Copy, Clone)]
struct BadSliceRepr {
ptr: *const u8,
len: &'static u8,
}
union SliceTransmute {
repr: SliceRepr,
bad: BadSliceRepr,
slice: &'static [u8],
str: &'static str,
my_str: &'static MyStr,
my_slice: &'static MySliceBool,
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}
#[repr(C)]
#[derive(Copy, Clone)]
struct DynRepr {
ptr: *const u8,
vtable: *const u8,
}
#[repr(C)]
#[derive(Copy, Clone)]
struct DynRepr2 {
ptr: *const u8,
vtable: *const u64,
}
#[repr(C)]
#[derive(Copy, Clone)]
struct BadDynRepr {
ptr: *const u8,
vtable: usize,
}
union DynTransmute {
repr: DynRepr,
repr2: DynRepr2,
bad: BadDynRepr,
rust: &'static Trait,
}
trait Trait {}
impl Trait for bool {}
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// custom unsized type
struct MyStr(str);
// custom unsized type with sized fields
struct MySlice<T: ?Sized>(bool, T);
type MySliceBool = MySlice<[bool]>;
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// OK
const A: &str = unsafe { SliceTransmute { repr: SliceRepr { ptr: &42, len: 1 } }.str};
// bad str
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const B: &str = unsafe { SliceTransmute { repr: SliceRepr { ptr: &42, len: 999 } }.str};
//~^ ERROR this constant likely exhibits undefined behavior
// bad str
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const C: &str = unsafe { SliceTransmute { bad: BadSliceRepr { ptr: &42, len: &3 } }.str};
//~^ ERROR this constant likely exhibits undefined behavior
// bad str in user-defined unsized type
const C2: &MyStr = unsafe { SliceTransmute { bad: BadSliceRepr { ptr: &42, len: &3 } }.my_str};
//~^ ERROR this constant likely exhibits undefined behavior
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// OK
const A2: &[u8] = unsafe { SliceTransmute { repr: SliceRepr { ptr: &42, len: 1 } }.slice};
// bad slice
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const B2: &[u8] = unsafe { SliceTransmute { repr: SliceRepr { ptr: &42, len: 999 } }.slice};
//~^ ERROR this constant likely exhibits undefined behavior
// bad slice
const C3: &[u8] = unsafe { SliceTransmute { bad: BadSliceRepr { ptr: &42, len: &3 } }.slice};
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//~^ ERROR this constant likely exhibits undefined behavior
// bad trait object
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const D: &Trait = unsafe { DynTransmute { repr: DynRepr { ptr: &92, vtable: &3 } }.rust};
//~^ ERROR this constant likely exhibits undefined behavior
// bad trait object
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const E: &Trait = unsafe { DynTransmute { repr2: DynRepr2 { ptr: &92, vtable: &3 } }.rust};
//~^ ERROR this constant likely exhibits undefined behavior
// bad trait object
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const F: &Trait = unsafe { DynTransmute { bad: BadDynRepr { ptr: &92, vtable: 3 } }.rust};
//~^ ERROR this constant likely exhibits undefined behavior
// bad data *inside* the trait object
const G: &Trait = &unsafe { BoolTransmute { val: 3 }.bl };
//~^ ERROR this constant likely exhibits undefined behavior
// bad data *inside* the slice
const H: &[bool] = &[unsafe { BoolTransmute { val: 3 }.bl }];
//~^ ERROR this constant likely exhibits undefined behavior
// good MySliceBool
const I1: &MySliceBool = &MySlice(true, [false]);
// bad: sized field is not okay
const I2: &MySliceBool = &MySlice(unsafe { BoolTransmute { val: 3 }.bl }, [false]);
//~^ ERROR this constant likely exhibits undefined behavior
// bad: unsized part is not okay
const I3: &MySliceBool = &MySlice(true, [unsafe { BoolTransmute { val: 3 }.bl }]);
//~^ ERROR this constant likely exhibits undefined behavior
// invalid UTF-8
const J1: &str = unsafe { SliceTransmute { slice: &[0xFF] }.str };
//~^ ERROR this constant likely exhibits undefined behavior
// invalid UTF-8 in user-defined str-like
const J2: &MyStr = unsafe { SliceTransmute { slice: &[0xFF] }.my_str };
//~^ ERROR this constant likely exhibits undefined behavior
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fn main() {
}