//! Backtrace support for the code generation.
use std::collections::BTreeMap;
/// Backtrace implementation for the code generation.
///
/// TODO: full implementation (#21)
#[derive(Debug, Default)]
pub struct Backtrace {
/// Compiled instructions.
///
/// TODO: Transform this into Opcodes. (#21)
instrs: BTreeMap<usize, Vec<u8>>,
}
impl Backtrace {
/// Pushes a new instruction set to the backtrace.
pub fn push(&mut self, bytes: impl AsRef<[u8]>) {
self.instrs.insert(self.instrs.len(), bytes.as_ref().into());
}
/// Pops the last instruction from the backtrace.
pub fn pop(&mut self) -> Vec<u8> {
self.instrs.pop_last().unwrap_or_default().1
}
/// Pop the last `n` operands from the backtrace.
pub fn popn(&mut self, n: usize) -> Vec<Vec<u8>> {
let mut r: Vec<Vec<u8>> = Default::default();
while r.len() < n {
r.push(self.pop())
}
r
}
}