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use binaryninjacore_sys::BNFromVariableIdentifier;
use crate::function::ILFunction;
use crate::rc::{Ref, RefCountable};
use crate::types::{SSAVariable, Variable};
pub struct OperandIter<F: ILFunction + RefCountable> {
function: Ref<F>,
remaining: usize,
next_iter_idx: Option<usize>,
current_iter: OperandIterInner,
}
impl<F: ILFunction + RefCountable> OperandIter<F> {
pub(crate) fn new(function: &F, idx: usize, number: usize) -> Self {
Self {
function: function.to_owned(),
remaining: number,
next_iter_idx: Some(idx),
current_iter: OperandIterInner::empty(),
}
}
pub fn pairs(self) -> OperandPairIter<F> {
assert_eq!(self.len() % 2, 0);
OperandPairIter(self)
}
pub fn exprs(self) -> OperandExprIter<F> {
OperandExprIter(self)
}
pub fn vars(self) -> OperandVarIter<F> {
OperandVarIter(self)
}
pub fn ssa_vars(self) -> OperandSSAVarIter<F> {
OperandSSAVarIter(self.pairs())
}
}
impl<F: ILFunction + RefCountable> Iterator for OperandIter<F> {
type Item = u64;
fn next(&mut self) -> Option<Self::Item> {
if let Some(item) = self.current_iter.next() {
self.remaining -= 1;
Some(item)
} else {
// Will short-circuit and return `None` once iter is exhausted
let iter_idx = self.next_iter_idx?;
let operands = self.function.operands_from_idx(iter_idx);
let next = if self.remaining > 4 {
self.next_iter_idx = Some(operands[4] as usize);
&operands[..4]
} else {
self.next_iter_idx = None;
&operands[..self.remaining]
};
self.current_iter = OperandIterInner::from_slice(next);
self.next()
}
}
}
impl<F: ILFunction + RefCountable> ExactSizeIterator for OperandIter<F> {
fn len(&self) -> usize {
self.remaining + self.current_iter.len()
}
}
struct OperandIterInner {
arr: [u64; 4],
idx: usize,
}
impl OperandIterInner {
fn from_slice(slice: &[u64]) -> Self {
assert!(slice.len() <= 4);
let idx = 4 - slice.len();
let mut arr = [0; 4];
arr[idx..].copy_from_slice(slice);
Self { arr, idx }
}
fn empty() -> Self {
Self {
arr: [0; 4],
idx: 4,
}
}
}
impl Iterator for OperandIterInner {
type Item = u64;
fn next(&mut self) -> Option<Self::Item> {
if self.idx < 4 {
let val = self.arr[self.idx];
self.idx += 1;
Some(val)
} else {
None
}
}
}
impl ExactSizeIterator for OperandIterInner {
fn len(&self) -> usize {
4 - self.idx
}
}
pub struct OperandPairIter<F: ILFunction + RefCountable>(OperandIter<F>);
impl<F: ILFunction + RefCountable> Iterator for OperandPairIter<F> {
type Item = (u64, u64);
fn next(&mut self) -> Option<Self::Item> {
let first = self.0.next()?;
let second = self.0.next()?;
Some((first, second))
}
}
impl<F: ILFunction + RefCountable> ExactSizeIterator for OperandPairIter<F> {
fn len(&self) -> usize {
self.0.len() / 2
}
}
pub struct OperandExprIter<F: ILFunction + RefCountable>(OperandIter<F>);
impl<F: ILFunction + RefCountable> Iterator for OperandExprIter<F> {
type Item = F::Instruction;
fn next(&mut self) -> Option<Self::Item> {
self.0
.next()
.map(|idx| self.0.function.il_instruction_from_idx(idx as usize))
}
}
impl<F: ILFunction + RefCountable> ExactSizeIterator for OperandExprIter<F> {
fn len(&self) -> usize {
self.0.len()
}
}
pub struct OperandVarIter<F: ILFunction + RefCountable>(OperandIter<F>);
impl<F: ILFunction + RefCountable> Iterator for OperandVarIter<F> {
type Item = Variable;
fn next(&mut self) -> Option<Self::Item> {
self.0.next().map(get_var)
}
}
impl<F: ILFunction + RefCountable> ExactSizeIterator for OperandVarIter<F> {
fn len(&self) -> usize {
self.0.len()
}
}
pub struct OperandSSAVarIter<F: ILFunction + RefCountable>(OperandPairIter<F>);
impl<F: ILFunction + RefCountable> Iterator for OperandSSAVarIter<F> {
type Item = SSAVariable;
fn next(&mut self) -> Option<Self::Item> {
self.0
.next()
.map(|(id, version)| get_var_ssa(id, version as usize))
}
}
impl<F: ILFunction + RefCountable> ExactSizeIterator for OperandSSAVarIter<F> {
fn len(&self) -> usize {
self.0.len()
}
}
pub fn get_var(id: u64) -> Variable {
unsafe { Variable::from_raw(BNFromVariableIdentifier(id)) }
}
pub fn get_var_ssa(id: u64, version: usize) -> SSAVariable {
SSAVariable::new(get_var(id), version)
}
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