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//! Manages the dataflow bits required for borrowck.
//!
//! FIXME: this might be better as a "generic" fixed-point combinator,
//! but is not as ugly as it is right now.
use rustc::mir::{BasicBlock, Location};
use rustc::ty::RegionVid;
use rustc_data_structures::bit_set::BitIter;
use crate::borrow_check::location::LocationIndex;
use polonius_engine::Output;
use crate::dataflow::move_paths::indexes::BorrowIndex;
use crate::dataflow::move_paths::HasMoveData;
use crate::dataflow::Borrows;
use crate::dataflow::EverInitializedPlaces;
use crate::dataflow::{FlowAtLocation, FlowsAtLocation};
use crate::dataflow::MaybeUninitializedPlaces;
use either::Either;
use std::fmt;
use std::rc::Rc;
// (forced to be `pub` due to its use as an associated type below.)
crate struct Flows<'b, 'gcx: 'tcx, 'tcx: 'b> {
borrows: FlowAtLocation<'tcx, Borrows<'b, 'gcx, 'tcx>>,
pub uninits: FlowAtLocation<'tcx, MaybeUninitializedPlaces<'b, 'gcx, 'tcx>>,
pub ever_inits: FlowAtLocation<'tcx, EverInitializedPlaces<'b, 'gcx, 'tcx>>,
/// Polonius Output
pub polonius_output: Option<Rc<Output<RegionVid, BorrowIndex, LocationIndex>>>,
}
impl<'b, 'gcx, 'tcx> Flows<'b, 'gcx, 'tcx> {
crate fn new(
borrows: FlowAtLocation<'tcx, Borrows<'b, 'gcx, 'tcx>>,
uninits: FlowAtLocation<'tcx, MaybeUninitializedPlaces<'b, 'gcx, 'tcx>>,
ever_inits: FlowAtLocation<'tcx, EverInitializedPlaces<'b, 'gcx, 'tcx>>,
polonius_output: Option<Rc<Output<RegionVid, BorrowIndex, LocationIndex>>>,
) -> Self {
Flows {
borrows,
uninits,
ever_inits,
polonius_output,
}
}
crate fn borrows_in_scope(
&self,
location: LocationIndex,
) -> impl Iterator<Item = BorrowIndex> + '_ {
if let Some(ref polonius) = self.polonius_output {
Either::Left(polonius.errors_at(location).iter().cloned())
} else {
Either::Right(self.borrows.iter_incoming())
}
}
crate fn with_outgoing_borrows(&self, op: impl FnOnce(BitIter<'_, BorrowIndex>)) {
self.borrows.with_iter_outgoing(op)
}
}
macro_rules! each_flow {
($this:ident, $meth:ident($arg:ident)) => {
FlowAtLocation::$meth(&mut $this.borrows, $arg);
FlowAtLocation::$meth(&mut $this.uninits, $arg);
FlowAtLocation::$meth(&mut $this.ever_inits, $arg);
};
}
impl<'b, 'gcx, 'tcx> FlowsAtLocation for Flows<'b, 'gcx, 'tcx> {
fn reset_to_entry_of(&mut self, bb: BasicBlock) {
each_flow!(self, reset_to_entry_of(bb));
}
fn reset_to_exit_of(&mut self, bb: BasicBlock) {
each_flow!(self, reset_to_exit_of(bb));
}
fn reconstruct_statement_effect(&mut self, location: Location) {
each_flow!(self, reconstruct_statement_effect(location));
}
fn reconstruct_terminator_effect(&mut self, location: Location) {
each_flow!(self, reconstruct_terminator_effect(location));
}
fn apply_local_effect(&mut self, location: Location) {
each_flow!(self, apply_local_effect(location));
}
}
impl<'b, 'gcx, 'tcx> fmt::Display for Flows<'b, 'gcx, 'tcx> {
fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
let mut s = String::new();
s.push_str("borrows in effect: [");
let mut saw_one = false;
self.borrows.each_state_bit(|borrow| {
if saw_one {
s.push_str(", ");
};
saw_one = true;
let borrow_data = &self.borrows.operator().borrows()[borrow];
s.push_str(&borrow_data.to_string());
});
s.push_str("] ");
s.push_str("borrows generated: [");
let mut saw_one = false;
self.borrows.each_gen_bit(|borrow| {
if saw_one {
s.push_str(", ");
};
saw_one = true;
let borrow_data = &self.borrows.operator().borrows()[borrow];
s.push_str(&borrow_data.to_string());
});
s.push_str("] ");
s.push_str("uninits: [");
let mut saw_one = false;
self.uninits.each_state_bit(|mpi_uninit| {
if saw_one {
s.push_str(", ");
};
saw_one = true;
let move_path = &self.uninits.operator().move_data().move_paths[mpi_uninit];
s.push_str(&move_path.to_string());
});
s.push_str("] ");
s.push_str("ever_init: [");
let mut saw_one = false;
self.ever_inits.each_state_bit(|mpi_ever_init| {
if saw_one {
s.push_str(", ");
};
saw_one = true;
let ever_init = &self.ever_inits.operator().move_data().inits[mpi_ever_init];
s.push_str(&format!("{:?}", ever_init));
});
s.push_str("]");
fmt::Display::fmt(&s, fmt)
}
}
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