// 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 or the MIT license // , at your // option. This file may not be copied, modified, or distributed // except according to those terms. // 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" #[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, } #[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 {} // OK const A: &str = unsafe { SliceTransmute { repr: SliceRepr { ptr: &42, len: 1 } }.str}; // bad const B: &str = unsafe { SliceTransmute { repr: SliceRepr { ptr: &42, len: 999 } }.str}; //~^ ERROR this constant likely exhibits undefined behavior // bad const C: &str = unsafe { SliceTransmute { bad: BadSliceRepr { ptr: &42, len: &3 } }.str}; //~^ ERROR this constant likely exhibits undefined behavior // OK const A2: &[u8] = unsafe { SliceTransmute { repr: SliceRepr { ptr: &42, len: 1 } }.slice}; // bad const B2: &[u8] = unsafe { SliceTransmute { repr: SliceRepr { ptr: &42, len: 999 } }.slice}; //~^ ERROR this constant likely exhibits undefined behavior // bad const C2: &[u8] = unsafe { SliceTransmute { bad: BadSliceRepr { ptr: &42, len: &3 } }.slice}; //~^ ERROR this constant likely exhibits undefined behavior // bad const D: &Trait = unsafe { DynTransmute { repr: DynRepr { ptr: &92, vtable: &3 } }.rust}; //~^ ERROR this constant likely exhibits undefined behavior // bad const E: &Trait = unsafe { DynTransmute { repr2: DynRepr2 { ptr: &92, vtable: &3 } }.rust}; //~^ ERROR this constant likely exhibits undefined behavior // bad const F: &Trait = unsafe { DynTransmute { bad: BadDynRepr { ptr: &92, vtable: 3 } }.rust}; //~^ ERROR this constant likely exhibits undefined behavior fn main() { }