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//! A single allocator event.
use crate::{AllocZeroed, Realloc, ReallocNull, Region, Request};
/// Metadata for a single allocation or deallocation.
#[derive(Debug, Clone)]
#[non_exhaustive]
pub enum Event {
/// An allocation.
Alloc(Request),
/// A deallocation.
Free(Request),
/// A zerod allocation, with an optional boolean indicates if it is actually
/// zeroed or not.
AllocZeroed(AllocZeroed),
/// A reallocation that moves and resized memory from one location to
/// another.
Realloc(Realloc),
/// An allocation failed (produced null).
AllocFailed,
/// A zero allocation that failed (produced null).
AllocZeroedFailed,
/// Allocator was asked to reallocate unallocated memory.
ReallocNull(ReallocNull),
/// A reallocation failed (produced null), and the previous region is left
/// unchanged.
ReallocFailed,
}
impl Event {
/// Test if this event is an allocation which matches the specified
/// predicate.
///
/// # Examples
///
/// ```rust
/// use checkers::{Event::*, Request, Region};
///
/// let request = Request::without_backtrace(Region::new(100.into(), 100, 4));
/// let event = Alloc(request);
///
/// assert!(event.is_alloc_with(|r| r.size == 100 && r.align == 4));
/// assert!(!event.is_free_with(|r| r.size == 100 && r.align == 4));
/// ```
pub fn is_alloc_with<F>(&self, f: F) -> bool
where
F: FnOnce(Region) -> bool,
{
match self {
Self::Alloc(request) | Self::AllocZeroed(AllocZeroed { request, .. }) => {
f(request.region)
}
_ => false,
}
}
/// Test if this event is a deallocation which matches the specified
/// predicate.
///
/// # Examples
///
/// ```rust
/// use checkers::{Event::*, Region, Request};
///
/// let request = Request::without_backtrace(Region::new(100.into(), 100, 4));
/// let event = Free(request);
///
/// assert!(!event.is_alloc_with(|r| r.size == 100 && r.align == 4));
/// assert!(event.is_free_with(|r| r.size == 100 && r.align == 4));
/// ```
pub fn is_free_with<F>(&self, f: F) -> bool
where
F: FnOnce(Region) -> bool,
{
match self {
Self::Free(request) => f(request.region),
_ => false,
}
}
/// Test if this event is an allocation which matches the specified
/// predicate.
///
/// # Examples
///
/// ```rust
/// use checkers::{Event::*, Request, Region, AllocZeroed};
///
/// let event = AllocZeroed(AllocZeroed::new(
/// Some(true),
/// Request::without_backtrace(Region::new(100.into(), 100, 4))
/// ));
///
/// assert!(event.is_alloc_zeroed_with(|r| r.request.region.size == 100 && r.request.region.align == 4));
/// assert!(!event.is_free_with(|r| r.size == 100 && r.align == 4));
/// ```
pub fn is_alloc_zeroed_with<F>(&self, f: F) -> bool
where
F: FnOnce(&AllocZeroed) -> bool,
{
match self {
Self::AllocZeroed(alloc_zeroed) => f(alloc_zeroed),
_ => false,
}
}
/// Test if this event is an allocation which matches the specified
/// predicate.
///
/// # Examples
///
/// ```rust
/// use checkers::{Event::*, Realloc, Region, Request};
///
/// let event = Realloc(Realloc::without_backtrace(
/// Some(true),
/// Region::new(10.into(), 10, 1),
/// Region::new(20.into(), 20, 1)
/// ));
///
/// assert!(event.is_realloc_with(|r| r.free.size == 10 && r.alloc.size == 20));
/// ```
pub fn is_realloc_with<F>(&self, f: F) -> bool
where
F: FnOnce(&Realloc) -> bool,
{
match self {
Self::Realloc(realloc) => f(realloc),
_ => false,
}
}
/// Test if this event is an allocation which matches the specified
/// predicate.
///
/// # Examples
///
/// ```rust
/// use checkers::Event;
///
/// assert!(Event::AllocFailed.is_failed());
/// assert!(Event::AllocZeroedFailed.is_failed());
/// assert!(Event::ReallocFailed.is_failed());
/// ```
pub fn is_failed(&self) -> bool {
matches!(
self,
Self::AllocFailed { .. } | Self::AllocZeroedFailed { .. } | Self::ReallocFailed { .. }
)
}
}