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#![allow(dead_code, missing_docs)]
#![unstable(
feature = "core_panic",
reason = "internal details of the implementation of the `panic!` and related macros",
issue = "none"
)]
use crate::fmt;
use crate::panic::{Location, PanicInfo};
#[cfg_attr(not(feature = "panic_immediate_abort"), inline(never), cold)]
#[cfg_attr(feature = "panic_immediate_abort", inline)]
#[track_caller]
#[lang = "panic_fmt"] #[rustc_do_not_const_check] #[rustc_const_unstable(feature = "core_panic", issue = "none")]
pub const fn panic_fmt(fmt: fmt::Arguments<'_>) -> ! {
if cfg!(feature = "panic_immediate_abort") {
super::intrinsics::abort()
}
extern "Rust" {
#[lang = "panic_impl"]
fn panic_impl(pi: &PanicInfo<'_>) -> !;
}
let pi = PanicInfo::internal_constructor(Some(&fmt), Location::caller(), true);
unsafe { panic_impl(&pi) }
}
#[cfg_attr(not(feature = "panic_immediate_abort"), inline(never), cold)]
#[cfg_attr(feature = "panic_immediate_abort", inline)]
#[rustc_nounwind]
pub fn panic_str_nounwind(msg: &'static str) -> ! {
if cfg!(feature = "panic_immediate_abort") {
super::intrinsics::abort()
}
extern "Rust" {
#[lang = "panic_impl"]
fn panic_impl(pi: &PanicInfo<'_>) -> !;
}
let pieces = [msg];
let fmt = fmt::Arguments::new_v1(&pieces, &[]);
let pi = PanicInfo::internal_constructor(Some(&fmt), Location::caller(), false);
unsafe { panic_impl(&pi) }
}
#[cfg_attr(not(feature = "panic_immediate_abort"), inline(never), cold)]
#[cfg_attr(feature = "panic_immediate_abort", inline)]
#[track_caller]
#[rustc_const_unstable(feature = "core_panic", issue = "none")]
#[lang = "panic"] pub const fn panic(expr: &'static str) -> ! {
panic_fmt(fmt::Arguments::new_v1(&[expr], &[]));
}
#[inline]
#[track_caller]
#[rustc_diagnostic_item = "panic_str"]
#[rustc_const_unstable(feature = "core_panic", issue = "none")]
pub const fn panic_str(expr: &str) -> ! {
panic_display(&expr);
}
#[inline]
#[track_caller]
#[rustc_diagnostic_item = "unreachable_display"] pub fn unreachable_display<T: fmt::Display>(x: &T) -> ! {
panic_fmt(format_args!("internal error: entered unreachable code: {}", *x));
}
#[inline]
#[track_caller]
#[lang = "panic_display"] #[rustc_do_not_const_check] #[rustc_const_unstable(feature = "core_panic", issue = "none")]
pub const fn panic_display<T: fmt::Display>(x: &T) -> ! {
panic_fmt(format_args!("{}", *x));
}
#[cfg_attr(not(feature = "panic_immediate_abort"), inline(never), cold)]
#[cfg_attr(feature = "panic_immediate_abort", inline)]
#[track_caller]
#[lang = "panic_bounds_check"] fn panic_bounds_check(index: usize, len: usize) -> ! {
if cfg!(feature = "panic_immediate_abort") {
super::intrinsics::abort()
}
panic!("index out of bounds: the len is {len} but the index is {index}")
}
#[cfg_attr(not(feature = "panic_immediate_abort"), inline(never), cold)]
#[cfg_attr(feature = "panic_immediate_abort", inline)]
#[lang = "panic_no_unwind"] #[rustc_nounwind]
fn panic_no_unwind() -> ! {
panic_str_nounwind("panic in a function that cannot unwind")
}
#[lang = "const_panic_fmt"]
#[rustc_const_unstable(feature = "core_panic", issue = "none")]
pub const fn const_panic_fmt(fmt: fmt::Arguments<'_>) -> ! {
if let Some(msg) = fmt.as_str() {
panic_str(msg);
} else {
unsafe { crate::hint::unreachable_unchecked() };
}
}
#[derive(Debug)]
#[doc(hidden)]
pub enum AssertKind {
Eq,
Ne,
Match,
}
#[cfg_attr(not(feature = "panic_immediate_abort"), inline(never), cold)]
#[cfg_attr(feature = "panic_immediate_abort", inline)]
#[track_caller]
#[doc(hidden)]
pub fn assert_failed<T, U>(
kind: AssertKind,
left: &T,
right: &U,
args: Option<fmt::Arguments<'_>>,
) -> !
where
T: fmt::Debug + ?Sized,
U: fmt::Debug + ?Sized,
{
assert_failed_inner(kind, &left, &right, args)
}
#[cfg_attr(not(feature = "panic_immediate_abort"), inline(never), cold)]
#[cfg_attr(feature = "panic_immediate_abort", inline)]
#[track_caller]
#[doc(hidden)]
pub fn assert_matches_failed<T: fmt::Debug + ?Sized>(
left: &T,
right: &str,
args: Option<fmt::Arguments<'_>>,
) -> ! {
struct Pattern<'a>(&'a str);
impl fmt::Debug for Pattern<'_> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str(self.0)
}
}
assert_failed_inner(AssertKind::Match, &left, &Pattern(right), args);
}
#[cfg_attr(not(feature = "panic_immediate_abort"), inline(never), cold)]
#[cfg_attr(feature = "panic_immediate_abort", inline)]
#[track_caller]
fn assert_failed_inner(
kind: AssertKind,
left: &dyn fmt::Debug,
right: &dyn fmt::Debug,
args: Option<fmt::Arguments<'_>>,
) -> ! {
let op = match kind {
AssertKind::Eq => "==",
AssertKind::Ne => "!=",
AssertKind::Match => "matches",
};
match args {
Some(args) => panic!(
r#"assertion failed: `(left {} right)`
left: `{:?}`,
right: `{:?}`: {}"#,
op, left, right, args
),
None => panic!(
r#"assertion failed: `(left {} right)`
left: `{:?}`,
right: `{:?}`"#,
op, left, right,
),
}
}