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|
//! Fuzzer for the "bucket_array::mem" API.
//!
//! Since this API `unsafe`, it's not a bad idea to make sure that
//! it can't do anything untoward.
#![no_main]
use arbitrary::Arbitrary;
use arrayvec::ArrayVec;
use equix::{BucketArray, BucketArrayMemory, BucketArrayPair, Uninit};
use libfuzzer_sys::fuzz_target;
use std::ops::{Bound::*, Range, RangeBounds};
type BucketIdx = u8;
type ItemIdx = u8;
type Val = u64;
#[derive(Clone, Debug, Arbitrary)]
enum Op {
Range(BucketIdx),
Value(BucketIdx, ItemIdx),
Insert(BucketIdx, Val, Val),
DropFirst,
}
#[derive(Debug)]
struct SimulatedArray<const N: usize, const CAP: usize, T>(ArrayVec<ArrayVec<T, CAP>, N>);
impl<const N: usize, const CAP: usize, T> Default for SimulatedArray<N, CAP, T> {
fn default() -> Self {
let mut r = ArrayVec::new();
for _ in 0..N {
r.push(ArrayVec::new());
}
Self(r)
}
}
impl<const N: usize, const CAP: usize, T> SimulatedArray<N, CAP, T> {
fn push(&mut self, bucket: usize, value: T) -> Result<(), ()> {
let a = &mut self.0[bucket];
if a.is_full() {
Err(())
} else {
a.push(value);
Ok(())
}
}
}
enum Sim<'a, 'b, const N: usize, const CAP: usize> {
Single {
b: BucketArray<'b, N, CAP, ItemIdx, Val>,
s: SimulatedArray<N, CAP, Val>,
},
Pair {
b: BucketArrayPair<'a, 'b, N, CAP, ItemIdx, Val, Val>,
s: SimulatedArray<N, CAP, (Val, Val)>,
},
}
impl<'a, 'b, const N: usize, const CAP: usize> Sim<'a, 'b, N, CAP> {
fn idx(&self, idx: BucketIdx) -> usize {
(idx as usize) % N
}
fn idx2(&self, idx: BucketIdx, item: ItemIdx) -> Option<(usize, usize)> {
let idx = self.idx(idx);
let r = self.range(idx);
assert_eq!(r.start_bound(), Included(&0));
let item = match r.end_bound() {
Included(x) => (item as usize) % (x + 1),
Excluded(&0) => return None,
Excluded(x) => (item as usize) % x,
Unbounded => unimplemented!(),
};
Some((idx, item))
}
fn range(&self, idx: usize) -> Range<usize> {
let (r1, r2) = match self {
Sim::Single { b, s } => (b.item_range(idx), 0..s.0[idx].len()),
Sim::Pair { b, s } => (b.item_range(idx), 0..s.0[idx].len()),
};
assert_eq!(r1, r2);
r1
}
fn apply(mut self, op: Op) -> Self {
match op {
Op::Range(idx) => {
let idx = self.idx(idx);
let _x = self.range(idx);
self
}
Op::Value(bi, ii) => {
if let Some((bi, ii)) = self.idx2(bi, ii) {
match &self {
Sim::Single { b, s } => {
let v1 = b.item_value(bi, ii);
let v2 = s.0[bi][ii];
assert_eq!(v1, v2);
}
Sim::Pair { b, s } => {
let v1 = (b.item_value_first(bi, ii), b.item_value_second(bi, ii));
let v2 = s.0[bi][ii];
assert_eq!(v1, v2);
}
}
}
self
}
Op::Insert(bi, v1, v2) => {
let bi = self.idx(bi);
match &mut self {
Sim::Single { b, s } => {
let r1 = b.insert(bi, v1);
let r2 = s.push(bi, v1);
assert_eq!(r1, r2);
}
Sim::Pair { b, s } => {
let r1 = b.insert(bi, v1, v2);
let r2 = s.push(bi, (v1, v2));
assert_eq!(r1, r2);
}
}
self
}
Op::DropFirst => match self {
Sim::Pair { b, s } => {
let b2 = b.drop_first();
let s2 = SimulatedArray(
s.0.into_iter()
.map(|a| a.into_iter().map(|(_x, y)| y).collect())
.collect(),
);
Sim::Single { b: b2, s: s2 }
}
single => single,
},
}
}
}
fuzz_target!(|ex: Vec<Op>| {
#[derive(Copy, Clone)]
struct MemLayout {
mem1a: BucketArrayMemory<7, 12, Val>,
mem1b: BucketArrayMemory<7, 12, Val>,
mem2a: BucketArrayMemory<8, 16, Val>,
mem2b: BucketArrayMemory<8, 16, Val>,
}
unsafe impl Uninit for MemLayout {}
let mut ml = MemLayout::alloc();
// Re-use the MemLayout to run the same test inputs twice
for _ in 0..2 {
let mut shape1: Sim<'_, '_, 7, 12> = Sim::Pair {
b: BucketArrayPair::new(&mut ml.mem1a, &mut ml.mem1b),
s: Default::default(),
};
let mut shape2: Sim<'_, '_, 8, 16> = Sim::Pair {
b: BucketArrayPair::new(&mut ml.mem2a, &mut ml.mem2b),
s: Default::default(),
};
for o in &ex {
shape1 = shape1.apply(o.clone());
shape2 = shape2.apply(o.clone());
}
}
});
|
