101 lines
4.7 KiB
Rust
101 lines
4.7 KiB
Rust
// ignore-tidy-linelength
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// This test checks that calling `mem::{uninitialized,zeroed}` with certain types results
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// in a lint.
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#![feature(never_type, rustc_attrs)]
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#![allow(deprecated)]
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#![deny(invalid_value)]
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use std::mem::{self, MaybeUninit};
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use std::ptr::NonNull;
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use std::num::NonZeroU32;
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enum Void {}
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struct Ref(&'static i32);
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struct RefPair((&'static i32, i32));
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struct Wrap<T> { wrapped: T }
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enum WrapEnum<T> { Wrapped(T) }
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#[rustc_layout_scalar_valid_range_start(0)]
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#[rustc_layout_scalar_valid_range_end(128)]
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#[repr(transparent)]
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pub(crate) struct NonBig(u64);
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#[allow(unused)]
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fn generic<T: 'static>() {
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unsafe {
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let _val: &'static T = mem::zeroed(); //~ ERROR: does not permit zero-initialization
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let _val: &'static T = mem::uninitialized(); //~ ERROR: does not permit being left uninitialized
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let _val: Wrap<&'static T> = mem::zeroed(); //~ ERROR: does not permit zero-initialization
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let _val: Wrap<&'static T> = mem::uninitialized(); //~ ERROR: does not permit being left uninitialized
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}
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}
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fn main() {
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unsafe {
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// Things that cannot even be zero.
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let _val: ! = mem::zeroed(); //~ ERROR: does not permit zero-initialization
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let _val: ! = mem::uninitialized(); //~ ERROR: does not permit being left uninitialized
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let _val: (i32, !) = mem::zeroed(); //~ ERROR: does not permit zero-initialization
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let _val: (i32, !) = mem::uninitialized(); //~ ERROR: does not permit being left uninitialized
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let _val: Void = mem::zeroed(); //~ ERROR: does not permit zero-initialization
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let _val: Void = mem::uninitialized(); //~ ERROR: does not permit being left uninitialized
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let _val: &'static i32 = mem::zeroed(); //~ ERROR: does not permit zero-initialization
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let _val: &'static i32 = mem::uninitialized(); //~ ERROR: does not permit being left uninitialized
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let _val: Ref = mem::zeroed(); //~ ERROR: does not permit zero-initialization
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let _val: Ref = mem::uninitialized(); //~ ERROR: does not permit being left uninitialized
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let _val: fn() = mem::zeroed(); //~ ERROR: does not permit zero-initialization
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let _val: fn() = mem::uninitialized(); //~ ERROR: does not permit being left uninitialized
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let _val: Wrap<fn()> = mem::zeroed(); //~ ERROR: does not permit zero-initialization
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let _val: Wrap<fn()> = mem::uninitialized(); //~ ERROR: does not permit being left uninitialized
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let _val: WrapEnum<fn()> = mem::zeroed(); //~ ERROR: does not permit zero-initialization
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let _val: WrapEnum<fn()> = mem::uninitialized(); //~ ERROR: does not permit being left uninitialized
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let _val: Wrap<(RefPair, i32)> = mem::zeroed(); //~ ERROR: does not permit zero-initialization
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let _val: Wrap<(RefPair, i32)> = mem::uninitialized(); //~ ERROR: does not permit being left uninitialized
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let _val: NonNull<i32> = mem::zeroed(); //~ ERROR: does not permit zero-initialization
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let _val: NonNull<i32> = mem::uninitialized(); //~ ERROR: does not permit being left uninitialized
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let _val: *const dyn Send = mem::zeroed(); //~ ERROR: does not permit zero-initialization
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let _val: *const dyn Send = mem::uninitialized(); //~ ERROR: does not permit being left uninitialized
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// Things that can be zero, but not uninit.
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let _val: bool = mem::zeroed();
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let _val: bool = mem::uninitialized(); //~ ERROR: does not permit being left uninitialized
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let _val: Wrap<char> = mem::zeroed();
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let _val: Wrap<char> = mem::uninitialized(); //~ ERROR: does not permit being left uninitialized
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let _val: NonBig = mem::zeroed();
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let _val: NonBig = mem::uninitialized(); //~ ERROR: does not permit being left uninitialized
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// Transmute-from-0
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let _val: &'static i32 = mem::transmute(0usize); //~ ERROR: does not permit zero-initialization
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let _val: &'static [i32] = mem::transmute((0usize, 0usize)); //~ ERROR: does not permit zero-initialization
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let _val: NonZeroU32 = mem::transmute(0); //~ ERROR: does not permit zero-initialization
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// `MaybeUninit` cases
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let _val: NonNull<i32> = MaybeUninit::zeroed().assume_init(); //~ ERROR: does not permit zero-initialization
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let _val: NonNull<i32> = MaybeUninit::uninit().assume_init(); //~ ERROR: does not permit being left uninitialized
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let _val: bool = MaybeUninit::uninit().assume_init(); //~ ERROR: does not permit being left uninitialized
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// Some more types that should work just fine.
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let _val: Option<&'static i32> = mem::zeroed();
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let _val: Option<fn()> = mem::zeroed();
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let _val: MaybeUninit<&'static i32> = mem::zeroed();
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let _val: i32 = mem::zeroed();
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let _val: bool = MaybeUninit::zeroed().assume_init();
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}
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}
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