2019-11-03 16:21:37 +00:00
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//@ run-pass
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2022-12-21 12:49:48 +00:00
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//@ revisions: default strict
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2022-05-23 15:44:05 +00:00
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//@ [strict]compile-flags: -Zstrict-init-checks
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2021-09-20 16:22:55 +00:00
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// ignore-tidy-linelength
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2024-03-06 20:44:54 +00:00
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//@ ignore-wasm32 spawning processes is not supported
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2022-12-24 07:44:11 +00:00
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//@ ignore-sgx no processes
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2024-02-22 13:59:52 +00:00
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//
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2019-11-03 16:21:37 +00:00
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// This test checks panic emitted from `mem::{uninitialized,zeroed}`.
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#![allow(deprecated, invalid_value)]
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2024-02-22 13:59:52 +00:00
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#![feature(never_type)]
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2019-11-03 16:21:37 +00:00
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2019-11-09 11:24:26 +00:00
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use std::{
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2020-02-17 08:21:02 +00:00
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mem::{self, MaybeUninit, ManuallyDrop},
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2019-11-09 11:24:26 +00:00
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ptr::NonNull,
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2020-02-17 08:21:02 +00:00
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num,
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2019-11-09 11:24:26 +00:00
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};
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2019-11-03 16:21:37 +00:00
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#[allow(dead_code)]
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struct Foo {
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x: u8,
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y: !,
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}
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enum Bar {}
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#[allow(dead_code)]
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enum OneVariant { Variant(i32) }
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2020-04-18 07:54:05 +00:00
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#[allow(dead_code, non_camel_case_types)]
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enum OneVariant_NonZero {
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2024-02-22 13:59:52 +00:00
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Variant(i32, i32, num::NonZero<i32>),
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2020-04-18 07:54:05 +00:00
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DeadVariant(Bar),
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}
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2022-09-20 09:33:16 +00:00
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#[allow(dead_code, non_camel_case_types)]
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enum OneVariant_Ref {
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Variant(&'static i32),
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DeadVariant(Bar),
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}
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2020-04-18 07:54:05 +00:00
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// An `Aggregate` abi enum where 0 is not a valid discriminant.
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#[allow(dead_code)]
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#[repr(i32)]
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enum NoNullVariant {
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Variant1(i32, i32) = 1,
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Variant2(i32, i32) = 2,
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}
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2020-02-17 08:21:02 +00:00
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// An enum with ScalarPair layout
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#[allow(dead_code)]
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enum LR {
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Left(i64),
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Right(i64),
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}
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#[allow(dead_code, non_camel_case_types)]
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enum LR_NonZero {
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2024-02-22 13:59:52 +00:00
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Left(num::NonZero<i64>),
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Right(num::NonZero<i64>),
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2020-02-17 08:21:02 +00:00
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}
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2022-05-23 15:44:05 +00:00
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struct ZeroSized;
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2022-07-14 21:42:47 +00:00
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#[allow(dead_code)]
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#[repr(i32)]
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enum ZeroIsValid {
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Zero(u8) = 0,
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One(NonNull<()>) = 1,
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}
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2022-09-20 09:33:16 +00:00
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#[track_caller]
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2022-12-21 12:49:48 +00:00
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fn test_panic_msg<T, F: (FnOnce() -> T) + 'static>(op: F, msg: &str) {
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use std::{panic, env, process};
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// The tricky part is that we can't just run `op`, as that would *abort* the process.
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// So instead, we reinvoke this process with the caller location as argument.
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// For the purpose of this test, the line number is unique enough.
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// If we are running in such a re-invocation, we skip all the tests *except* for the one with that type name.
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let our_loc = panic::Location::caller().line().to_string();
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let mut args = env::args();
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let this = args.next().unwrap();
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if let Some(loc) = args.next() {
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if loc == our_loc {
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op();
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panic!("we did not abort");
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} else {
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// Nothing, we are running another test.
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}
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} else {
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// Invoke new process for actual test, and check result.
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let mut cmd = process::Command::new(this);
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cmd.arg(our_loc);
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let res = cmd.output().unwrap();
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assert!(!res.status.success(), "test did not fail");
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let stderr = String::from_utf8_lossy(&res.stderr);
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assert!(stderr.contains(msg), "test did not contain expected output: looking for {:?}, output:\n{}", msg, stderr);
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}
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2019-11-03 16:21:37 +00:00
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}
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2022-09-20 09:33:16 +00:00
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#[track_caller]
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2022-12-21 12:49:48 +00:00
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fn test_panic_msg_only_if_strict<T>(op: impl (FnOnce() -> T) + 'static, msg: &str) {
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if !cfg!(strict) {
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// Just run it.
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op();
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} else {
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test_panic_msg(op, msg);
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}
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2022-09-20 09:33:16 +00:00
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}
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2019-11-03 16:21:37 +00:00
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fn main() {
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unsafe {
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2020-02-17 08:21:02 +00:00
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// Uninhabited types
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2019-11-03 16:21:37 +00:00
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test_panic_msg(
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|| mem::uninitialized::<!>(),
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"attempted to instantiate uninhabited type `!`"
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);
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test_panic_msg(
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|| mem::zeroed::<!>(),
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"attempted to instantiate uninhabited type `!`"
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);
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test_panic_msg(
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2019-11-09 11:24:26 +00:00
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|| MaybeUninit::<!>::uninit().assume_init(),
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2019-11-03 16:21:37 +00:00
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"attempted to instantiate uninhabited type `!`"
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);
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test_panic_msg(
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|| mem::uninitialized::<Foo>(),
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"attempted to instantiate uninhabited type `Foo`"
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);
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test_panic_msg(
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|| mem::zeroed::<Foo>(),
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"attempted to instantiate uninhabited type `Foo`"
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);
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test_panic_msg(
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2019-11-09 11:24:26 +00:00
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|| MaybeUninit::<Foo>::uninit().assume_init(),
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2019-11-03 16:21:37 +00:00
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"attempted to instantiate uninhabited type `Foo`"
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);
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test_panic_msg(
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|| mem::uninitialized::<Bar>(),
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"attempted to instantiate uninhabited type `Bar`"
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);
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test_panic_msg(
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|| mem::zeroed::<Bar>(),
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"attempted to instantiate uninhabited type `Bar`"
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);
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test_panic_msg(
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2019-11-09 11:24:26 +00:00
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|| MaybeUninit::<Bar>::uninit().assume_init(),
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2019-11-03 16:21:37 +00:00
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"attempted to instantiate uninhabited type `Bar`"
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);
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2022-03-27 18:10:19 +00:00
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test_panic_msg(
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|| mem::uninitialized::<[Foo; 2]>(),
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"attempted to instantiate uninhabited type `[Foo; 2]`"
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);
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test_panic_msg(
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|| mem::zeroed::<[Foo; 2]>(),
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"attempted to instantiate uninhabited type `[Foo; 2]`"
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);
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test_panic_msg(
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|| MaybeUninit::<[Foo; 2]>::uninit().assume_init(),
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"attempted to instantiate uninhabited type `[Foo; 2]`"
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);
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test_panic_msg(
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|| mem::uninitialized::<[Bar; 2]>(),
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"attempted to instantiate uninhabited type `[Bar; 2]`"
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);
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test_panic_msg(
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|| mem::zeroed::<[Bar; 2]>(),
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"attempted to instantiate uninhabited type `[Bar; 2]`"
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);
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test_panic_msg(
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|| MaybeUninit::<[Bar; 2]>::uninit().assume_init(),
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"attempted to instantiate uninhabited type `[Bar; 2]`"
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);
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2022-09-20 09:33:16 +00:00
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// Types that don't allow either.
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2019-11-03 16:21:37 +00:00
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test_panic_msg(
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2022-09-20 09:33:16 +00:00
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|| mem::zeroed::<&i32>(),
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"attempted to zero-initialize type `&i32`, which is invalid"
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2019-11-03 16:21:37 +00:00
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);
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test_panic_msg(
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2022-09-20 09:33:16 +00:00
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|| mem::uninitialized::<&i32>(),
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"attempted to leave type `&i32` uninitialized, which is invalid"
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2019-11-03 16:21:37 +00:00
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);
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test_panic_msg(
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2022-09-20 09:33:16 +00:00
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|| mem::zeroed::<Box<[i32; 0]>>(),
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"attempted to zero-initialize type `alloc::boxed::Box<[i32; 0]>`, which is invalid"
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);
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test_panic_msg(
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|| mem::uninitialized::<Box<[i32; 0]>>(),
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"attempted to leave type `alloc::boxed::Box<[i32; 0]>` uninitialized, which is invalid"
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);
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test_panic_msg(
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|| mem::zeroed::<Box<u8>>(),
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"attempted to zero-initialize type `alloc::boxed::Box<u8>`, which is invalid"
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2019-11-03 16:21:37 +00:00
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);
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2022-09-20 09:33:16 +00:00
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test_panic_msg(
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|| mem::uninitialized::<Box<u8>>(),
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"attempted to leave type `alloc::boxed::Box<u8>` uninitialized, which is invalid"
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);
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test_panic_msg(
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|| mem::zeroed::<&[i32]>(),
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"attempted to zero-initialize type `&[i32]`, which is invalid"
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);
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test_panic_msg(
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|| mem::uninitialized::<&[i32]>(),
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"attempted to leave type `&[i32]` uninitialized, which is invalid"
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);
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test_panic_msg(
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|| mem::zeroed::<&(u8, [u8])>(),
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"attempted to zero-initialize type `&(u8, [u8])`, which is invalid"
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);
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test_panic_msg(
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|| mem::uninitialized::<&(u8, [u8])>(),
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"attempted to leave type `&(u8, [u8])` uninitialized, which is invalid"
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);
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test_panic_msg(
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|| mem::zeroed::<&dyn Send>(),
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"attempted to zero-initialize type `&dyn core::marker::Send`, which is invalid"
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);
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test_panic_msg(
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|| mem::uninitialized::<&dyn Send>(),
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"attempted to leave type `&dyn core::marker::Send` uninitialized, which is invalid"
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);
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2019-11-03 16:21:37 +00:00
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test_panic_msg(
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|| mem::zeroed::<*const dyn Send>(),
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2021-09-20 16:22:55 +00:00
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"attempted to zero-initialize type `*const dyn core::marker::Send`, which is invalid"
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2019-11-03 16:21:37 +00:00
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);
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2022-09-20 09:33:16 +00:00
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test_panic_msg(
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|| mem::uninitialized::<*const dyn Send>(),
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"attempted to leave type `*const dyn core::marker::Send` uninitialized, which is invalid"
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);
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2019-11-03 16:21:37 +00:00
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test_panic_msg(
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2022-09-20 09:33:16 +00:00
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|| mem::uninitialized::<NoNullVariant>(),
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"attempted to leave type `NoNullVariant` uninitialized, \
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which is invalid"
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);
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test_panic_msg(
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|| mem::zeroed::<NoNullVariant>(),
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"attempted to zero-initialize type `NoNullVariant`, \
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2019-11-03 16:21:37 +00:00
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which is invalid"
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);
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2022-07-14 21:42:47 +00:00
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2019-11-03 16:21:37 +00:00
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test_panic_msg(
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2022-09-20 09:33:16 +00:00
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|| mem::zeroed::<OneVariant_Ref>(),
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"attempted to zero-initialize type `OneVariant_Ref`, \
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2019-11-03 16:21:37 +00:00
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which is invalid"
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);
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2022-09-20 09:33:16 +00:00
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test_panic_msg(
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|| mem::uninitialized::<OneVariant_Ref>(),
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"attempted to leave type `OneVariant_Ref` uninitialized, which is invalid"
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);
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2020-04-18 07:54:05 +00:00
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2022-09-20 09:33:16 +00:00
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// Types where both are invalid, but we allow uninit since the 0x01-filling is not LLVM UB.
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2020-04-18 07:54:05 +00:00
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test_panic_msg(
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2022-09-20 09:33:16 +00:00
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|| mem::zeroed::<fn()>(),
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"attempted to zero-initialize type `fn()`, which is invalid"
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);
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test_panic_msg_only_if_strict(
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|| mem::uninitialized::<fn()>(),
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|
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"attempted to leave type `fn()` uninitialized, which is invalid"
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);
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test_panic_msg(
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|
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|| mem::zeroed::<&()>(),
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"attempted to zero-initialize type `&()`, which is invalid"
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);
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test_panic_msg_only_if_strict(
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|
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|| mem::uninitialized::<&()>(),
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|
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"attempted to leave type `&()` uninitialized, which is invalid"
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);
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test_panic_msg(
|
|
|
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|| mem::zeroed::<&[u8]>(),
|
|
|
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"attempted to zero-initialize type `&[u8]`, which is invalid"
|
|
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);
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test_panic_msg_only_if_strict(
|
|
|
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|| mem::uninitialized::<&[u8]>(),
|
|
|
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"attempted to leave type `&[u8]` uninitialized, which is invalid"
|
|
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);
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test_panic_msg(
|
|
|
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|| mem::zeroed::<&str>(),
|
|
|
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"attempted to zero-initialize type `&str`, which is invalid"
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);
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test_panic_msg_only_if_strict(
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|
|
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|| mem::uninitialized::<&str>(),
|
|
|
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"attempted to leave type `&str` uninitialized, which is invalid"
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);
|
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test_panic_msg(
|
|
|
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|| mem::zeroed::<(NonNull<u32>, u32, u32)>(),
|
|
|
|
"attempted to zero-initialize type `(core::ptr::non_null::NonNull<u32>, u32, u32)`, \
|
2020-04-18 07:54:05 +00:00
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which is invalid"
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|
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);
|
2022-09-20 09:33:16 +00:00
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|
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test_panic_msg_only_if_strict(
|
|
|
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|| mem::uninitialized::<(NonNull<u32>, u32, u32)>(),
|
|
|
|
"attempted to leave type `(core::ptr::non_null::NonNull<u32>, u32, u32)` uninitialized, which is invalid"
|
|
|
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);
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|
|
|
|
2020-04-18 07:54:05 +00:00
|
|
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test_panic_msg(
|
|
|
|
|| mem::zeroed::<OneVariant_NonZero>(),
|
|
|
|
"attempted to zero-initialize type `OneVariant_NonZero`, \
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|
|
|
which is invalid"
|
|
|
|
);
|
2022-09-20 09:33:16 +00:00
|
|
|
test_panic_msg_only_if_strict(
|
|
|
|
|| mem::uninitialized::<OneVariant_NonZero>(),
|
|
|
|
"attempted to leave type `OneVariant_NonZero` uninitialized, which is invalid"
|
|
|
|
);
|
2020-04-18 07:54:05 +00:00
|
|
|
|
2022-09-20 09:33:16 +00:00
|
|
|
// Types where both are invalid but we allow the zeroed form since it is not LLVM UB.
|
|
|
|
test_panic_msg_only_if_strict(
|
|
|
|
|| mem::zeroed::<LR_NonZero>(),
|
|
|
|
"attempted to zero-initialize type `LR_NonZero`, which is invalid"
|
|
|
|
);
|
2022-07-14 21:42:47 +00:00
|
|
|
test_panic_msg(
|
|
|
|
|| mem::uninitialized::<LR_NonZero>(),
|
|
|
|
"attempted to leave type `LR_NonZero` uninitialized, which is invalid"
|
|
|
|
);
|
|
|
|
|
2022-09-20 09:33:16 +00:00
|
|
|
test_panic_msg_only_if_strict(
|
|
|
|
|| mem::zeroed::<ManuallyDrop<LR_NonZero>>(),
|
|
|
|
"attempted to zero-initialize type `core::mem::manually_drop::ManuallyDrop<LR_NonZero>`, \
|
|
|
|
which is invalid"
|
|
|
|
);
|
2022-07-14 21:42:47 +00:00
|
|
|
test_panic_msg(
|
|
|
|
|| mem::uninitialized::<ManuallyDrop<LR_NonZero>>(),
|
|
|
|
"attempted to leave type `core::mem::manually_drop::ManuallyDrop<LR_NonZero>` uninitialized, \
|
|
|
|
which is invalid"
|
|
|
|
);
|
|
|
|
|
2022-09-20 09:33:16 +00:00
|
|
|
// Some strict-only things
|
|
|
|
test_panic_msg_only_if_strict(
|
|
|
|
|| mem::uninitialized::<i32>(),
|
|
|
|
"attempted to leave type `i32` uninitialized, which is invalid"
|
2020-04-18 07:54:05 +00:00
|
|
|
);
|
2022-07-14 21:42:47 +00:00
|
|
|
|
2022-09-20 09:33:16 +00:00
|
|
|
test_panic_msg_only_if_strict(
|
|
|
|
|| mem::uninitialized::<*const ()>(),
|
|
|
|
"attempted to leave type `*const ()` uninitialized, which is invalid"
|
2020-04-18 07:54:05 +00:00
|
|
|
);
|
2019-11-03 16:21:37 +00:00
|
|
|
|
2022-09-20 09:33:16 +00:00
|
|
|
test_panic_msg_only_if_strict(
|
|
|
|
|| mem::uninitialized::<[i32; 1]>(),
|
|
|
|
"attempted to leave type `[i32; 1]` uninitialized, which is invalid"
|
2019-11-03 16:21:37 +00:00
|
|
|
);
|
2022-07-14 21:42:47 +00:00
|
|
|
|
2022-09-20 09:33:16 +00:00
|
|
|
test_panic_msg_only_if_strict(
|
|
|
|
|| mem::zeroed::<[NonNull<()>; 1]>(),
|
|
|
|
"attempted to zero-initialize type `[core::ptr::non_null::NonNull<()>; 1]`, which is invalid"
|
|
|
|
);
|
|
|
|
|
|
|
|
// Types that can be zero, but not uninit (though some are mitigated).
|
|
|
|
let _val = mem::zeroed::<LR>();
|
2020-02-17 08:21:02 +00:00
|
|
|
test_panic_msg(
|
|
|
|
|| mem::uninitialized::<LR>(),
|
|
|
|
"attempted to leave type `LR` uninitialized, which is invalid"
|
|
|
|
);
|
2022-07-14 21:42:47 +00:00
|
|
|
|
2022-09-20 09:33:16 +00:00
|
|
|
let _val = mem::zeroed::<ManuallyDrop<LR>>();
|
2020-02-17 08:21:02 +00:00
|
|
|
test_panic_msg(
|
|
|
|
|| mem::uninitialized::<ManuallyDrop<LR>>(),
|
2021-09-20 16:22:55 +00:00
|
|
|
"attempted to leave type `core::mem::manually_drop::ManuallyDrop<LR>` uninitialized, which is invalid"
|
2020-02-17 08:21:02 +00:00
|
|
|
);
|
2019-11-03 16:21:37 +00:00
|
|
|
|
|
|
|
let _val = mem::zeroed::<bool>();
|
2022-09-20 09:33:16 +00:00
|
|
|
test_panic_msg_only_if_strict(
|
|
|
|
|| mem::uninitialized::<bool>(),
|
|
|
|
"attempted to leave type `bool` uninitialized, which is invalid"
|
|
|
|
);
|
|
|
|
|
2019-11-03 16:21:37 +00:00
|
|
|
let _val = mem::zeroed::<OneVariant>();
|
2022-09-20 09:33:16 +00:00
|
|
|
test_panic_msg_only_if_strict(
|
|
|
|
|| mem::uninitialized::<OneVariant>(),
|
|
|
|
"attempted to leave type `OneVariant` uninitialized, which is invalid"
|
|
|
|
);
|
|
|
|
|
|
|
|
// Some things that are actually allowed.
|
2019-11-03 16:21:37 +00:00
|
|
|
let _val = mem::zeroed::<Option<&'static i32>>();
|
2019-11-09 11:24:26 +00:00
|
|
|
let _val = mem::zeroed::<MaybeUninit<NonNull<u32>>>();
|
2022-03-27 18:10:19 +00:00
|
|
|
let _val = mem::zeroed::<[!; 0]>();
|
2022-07-14 21:42:47 +00:00
|
|
|
let _val = mem::zeroed::<ZeroIsValid>();
|
2019-11-09 11:24:26 +00:00
|
|
|
let _val = mem::uninitialized::<MaybeUninit<bool>>();
|
2022-03-27 18:10:19 +00:00
|
|
|
let _val = mem::uninitialized::<[!; 0]>();
|
2023-06-12 08:55:36 +00:00
|
|
|
let _val: () = mem::uninitialized::<()>();
|
2022-05-23 15:44:05 +00:00
|
|
|
let _val = mem::uninitialized::<ZeroSized>();
|
2019-11-03 16:21:37 +00:00
|
|
|
}
|
|
|
|
}
|