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use std::fmt;
use std::ops::{Div, Mul};
use rustc_error_messages::{DiagArgValue, IntoDiagArg};
use rustc_macros::{Decodable, Encodable, HashStable_Generic};
/// New-type wrapper around `usize` for representing limits. Ensures that comparisons against
/// limits are consistent throughout the compiler.
#[derive(Clone, Copy, Debug, HashStable_Generic, Encodable, Decodable)]
pub struct Limit(pub usize);
impl Limit {
/// Create a new limit from a `usize`.
pub fn new(value: usize) -> Self {
Limit(value)
}
/// Create a new unlimited limit.
pub fn unlimited() -> Self {
Limit(usize::MAX)
}
/// Check that `value` is within the limit. Ensures that the same comparisons are used
/// throughout the compiler, as mismatches can cause ICEs, see #72540.
#[inline]
pub fn value_within_limit(&self, value: usize) -> bool {
value <= self.0
}
}
impl From<usize> for Limit {
fn from(value: usize) -> Self {
Self::new(value)
}
}
impl fmt::Display for Limit {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.0.fmt(f)
}
}
impl Div<usize> for Limit {
type Output = Limit;
fn div(self, rhs: usize) -> Self::Output {
Limit::new(self.0 / rhs)
}
}
impl Mul<usize> for Limit {
type Output = Limit;
fn mul(self, rhs: usize) -> Self::Output {
Limit::new(self.0 * rhs)
}
}
impl IntoDiagArg for Limit {
fn into_diag_arg(self, _: &mut Option<std::path::PathBuf>) -> DiagArgValue {
self.to_string().into_diag_arg(&mut None)
}
}
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