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//! Register state
use bitflags::Flags;
use crate::state::State;
#[derive(Clone, Copy, PartialEq, Eq, Debug)]
#[allow(dead_code)]
pub enum RDiff<B> {
Changed { from: B, to: B },
Unchanged { value: B },
}
#[allow(dead_code)]
impl<X: PartialEq> RDiff<X> {
pub fn make(before: X, after: X) -> Self {
if before != after {
Self::Changed {
from: before,
to: after,
}
} else {
Self::Unchanged { value: before }
}
}
}
pub struct StateDiff<const N: usize> {
pub regs: [RDiff<u64>; N],
pub pc: RDiff<u64>,
pub flags: Vec<(&'static str, RDiff<bool>)>,
}
impl<const N: usize> StateDiff<N> {
pub fn print<S: State<N>>(&self) -> bool {
let diff_regs = self
.regs
.iter()
.enumerate()
.filter_map(|(i, s)| {
if let RDiff::Changed { from, to } = s {
Some((i, from, to))
} else {
None
}
})
.collect::<Vec<_>>();
for (i, a, b) in &diff_regs {
println!("{} <- {:x} (prev {:x})", S::reg_name(*i), b, a);
}
if let RDiff::Changed { from: _, to } = self.pc {
println!("pc <- {:x}", to);
}
// ignore pc
// pretty print flags
let flags = self
.flags
.iter()
.filter_map(|(name, flag)| {
if let RDiff::Changed { from, to } = flag {
debug_assert_ne!(from, to);
Some((*name, *from))
} else {
None
}
})
.collect::<Vec<_>>();
for (name, previous) in &flags {
if *previous {
println!("flags -{}", name);
} else {
println!("flags +{}", name);
}
}
!diff_regs.is_empty() || !flags.is_empty()
}
}
pub fn diff<S: State<N>, const N: usize>(current: &S, future: &S) -> StateDiff<N> {
let regs: [RDiff<u64>; N] = current
.regs()
.iter()
.zip(future.regs().iter())
.map(|(a, b)| RDiff::make(*a, *b))
.collect::<Vec<_>>()
.try_into()
.unwrap();
let pc = RDiff::make(current.pc(), future.pc());
let flags: Vec<_> = S::FLAGS::all()
.iter_names()
.map(|(name, flag)| {
let cur = current.flags().contains(flag);
let fut = future.flags().contains(flag);
let diff = if cur != fut {
RDiff::Changed { from: cur, to: fut }
} else {
RDiff::Unchanged { value: cur }
};
(name, diff)
})
.collect();
StateDiff { regs, pc, flags }
}
#[cfg(test)]
mod tests {
use super::RDiff;
//use crate::CpuState;
#[test]
fn single_diff() {
let i0 = 0;
let i1 = 5;
let i2 = 5;
let d1 = RDiff::make(i0, i1);
let d2 = RDiff::make(i1, i2);
assert_eq!(d1, RDiff::Changed { from: 0, to: 5 });
assert_eq!(d2, RDiff::Unchanged { value: 5 });
}
//#[test]
//fn state_diff() {
// let original = crate::CpuState {
// regs: [0, 2, 3, 0],
// pc: 0x40000,
// flags: 0x10,
// };
// let modified = crate::CpuState {
// regs: [0, 3, 3, -1],
// pc: 0x40004,
// flags: 0x08,
// };
// let diff = original.diff(&modified);
// assert_eq!(
// diff,
// CpuState {
// regs: [
// RDiff::Unchanged { value: 0 },
// RDiff::Changed { from: 2, to: 3 },
// RDiff::Unchanged { value: 3 },
// RDiff::Changed { from: 0, to: -1 },
// ],
// pc: RDiff::Changed {
// from: 0x40000,
// to: 0x40004
// },
// flags: RDiff::Changed {
// from: 0x10,
// to: 0x8
// },
// }
// );
//}
}