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//! Functions and structures for defining and activating instruction callbacks
use crate::backend::Backend;
use crate::error::Result;
use crate::state::State;
use std::rc::Rc;
#[derive(Clone)]
pub struct Callbacks<'p, B: Backend> {
/// `haybale` will call each of these functions before processing each
/// LLVM non-terminator instruction.
///
/// If the callback returns an `Err`, `haybale` will propagate it accordingly.
#[allow(clippy::type_complexity)]
pub(crate) instruction_callbacks:
Vec<Rc<dyn Fn(&'p llvm_ir::Instruction, &State<B>) -> Result<()> + 'p>>,
/// `haybale` will call each of these functions before processing each
/// LLVM terminator instruction.
///
/// If the callback returns an `Err`, `haybale` will propagate it accordingly.
#[allow(clippy::type_complexity)]
pub(crate) terminator_callbacks:
Vec<Rc<dyn Fn(&'p llvm_ir::Terminator, &State<B>) -> Result<()> + 'p>>,
}
impl<'p, B: Backend> Callbacks<'p, B> {
/// Add an instruction callback. `haybale` will call the provided function
/// before processing each LLVM non-terminator instruction.
///
/// If multiple instruction callbacks are added (by calling this function
/// multiple times), `haybale` will call each of them before processing each
/// instruction.
///
/// If any callback returns an `Err`, `haybale` will propagate it accordingly.
pub fn add_instruction_callback(
&mut self,
cb: impl Fn(&'p llvm_ir::Instruction, &State<B>) -> Result<()> + 'p,
) {
self.instruction_callbacks.push(Rc::new(cb))
}
/// Add a terminator callback. `haybale` will call the provided function
/// before processing each LLVM terminator instruction.
///
/// If multiple terminator callbacks are added (by calling this function
/// multiple times), `haybale` will call each of them before processing each
/// terminator.
///
/// If any callback returns an `Err`, `haybale` will propagate it accordingly.
pub fn add_terminator_callback(
&mut self,
cb: impl Fn(&'p llvm_ir::Terminator, &State<B>) -> Result<()> + 'p,
) {
self.terminator_callbacks.push(Rc::new(cb))
}
}
impl<'p, B: Backend> Default for Callbacks<'p, B> {
fn default() -> Self {
Self {
instruction_callbacks: Vec::new(),
terminator_callbacks: Vec::new(),
}
}
}