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use crate::location::{LocationIndex, LocationTable};
use crate::BorrowIndex;
use polonius_engine::AllFacts as PoloniusFacts;
use polonius_engine::Atom;
use rustc_index::vec::Idx;
use rustc_middle::mir::Local;
use rustc_middle::ty::{RegionVid, TyCtxt};
use rustc_mir_dataflow::move_paths::MovePathIndex;
use std::error::Error;
use std::fmt::Debug;
use std::fs::{self, File};
use std::io::{BufWriter, Write};
use std::path::Path;
#[derive(Copy, Clone, Debug)]
pub struct RustcFacts;
impl polonius_engine::FactTypes for RustcFacts {
type Origin = RegionVid;
type Loan = BorrowIndex;
type Point = LocationIndex;
type Variable = Local;
type Path = MovePathIndex;
}
pub type AllFacts = PoloniusFacts<RustcFacts>;
pub(crate) trait AllFactsExt {
/// Returns `true` if there is a need to gather `AllFacts` given the
/// current `-Z` flags.
fn enabled(tcx: TyCtxt<'_>) -> bool;
fn write_to_dir(
&self,
dir: impl AsRef<Path>,
location_table: &LocationTable,
) -> Result<(), Box<dyn Error>>;
}
impl AllFactsExt for AllFacts {
/// Return
fn enabled(tcx: TyCtxt<'_>) -> bool {
tcx.sess.opts.unstable_opts.nll_facts || tcx.sess.opts.unstable_opts.polonius
}
fn write_to_dir(
&self,
dir: impl AsRef<Path>,
location_table: &LocationTable,
) -> Result<(), Box<dyn Error>> {
let dir: &Path = dir.as_ref();
fs::create_dir_all(dir)?;
let wr = FactWriter { location_table, dir };
macro_rules! write_facts_to_path {
($wr:ident . write_facts_to_path($this:ident . [
$($field:ident,)*
])) => {
$(
$wr.write_facts_to_path(
&$this.$field,
&format!("{}.facts", stringify!($field))
)?;
)*
}
}
write_facts_to_path! {
wr.write_facts_to_path(self.[
loan_issued_at,
universal_region,
cfg_edge,
loan_killed_at,
subset_base,
loan_invalidated_at,
var_used_at,
var_defined_at,
var_dropped_at,
use_of_var_derefs_origin,
drop_of_var_derefs_origin,
child_path,
path_is_var,
path_assigned_at_base,
path_moved_at_base,
path_accessed_at_base,
known_placeholder_subset,
placeholder,
])
}
Ok(())
}
}
impl Atom for BorrowIndex {
fn index(self) -> usize {
Idx::index(self)
}
}
impl Atom for LocationIndex {
fn index(self) -> usize {
Idx::index(self)
}
}
struct FactWriter<'w> {
location_table: &'w LocationTable,
dir: &'w Path,
}
impl<'w> FactWriter<'w> {
fn write_facts_to_path<T>(&self, rows: &[T], file_name: &str) -> Result<(), Box<dyn Error>>
where
T: FactRow,
{
let file = &self.dir.join(file_name);
let mut file = BufWriter::new(File::create(file)?);
for row in rows {
row.write(&mut file, self.location_table)?;
}
Ok(())
}
}
trait FactRow {
fn write(
&self,
out: &mut dyn Write,
location_table: &LocationTable,
) -> Result<(), Box<dyn Error>>;
}
impl FactRow for RegionVid {
fn write(
&self,
out: &mut dyn Write,
location_table: &LocationTable,
) -> Result<(), Box<dyn Error>> {
write_row(out, location_table, &[self])
}
}
impl<A, B> FactRow for (A, B)
where
A: FactCell,
B: FactCell,
{
fn write(
&self,
out: &mut dyn Write,
location_table: &LocationTable,
) -> Result<(), Box<dyn Error>> {
write_row(out, location_table, &[&self.0, &self.1])
}
}
impl<A, B, C> FactRow for (A, B, C)
where
A: FactCell,
B: FactCell,
C: FactCell,
{
fn write(
&self,
out: &mut dyn Write,
location_table: &LocationTable,
) -> Result<(), Box<dyn Error>> {
write_row(out, location_table, &[&self.0, &self.1, &self.2])
}
}
impl<A, B, C, D> FactRow for (A, B, C, D)
where
A: FactCell,
B: FactCell,
C: FactCell,
D: FactCell,
{
fn write(
&self,
out: &mut dyn Write,
location_table: &LocationTable,
) -> Result<(), Box<dyn Error>> {
write_row(out, location_table, &[&self.0, &self.1, &self.2, &self.3])
}
}
fn write_row(
out: &mut dyn Write,
location_table: &LocationTable,
columns: &[&dyn FactCell],
) -> Result<(), Box<dyn Error>> {
for (index, c) in columns.iter().enumerate() {
let tail = if index == columns.len() - 1 { "\n" } else { "\t" };
write!(out, "{:?}{}", c.to_string(location_table), tail)?;
}
Ok(())
}
trait FactCell {
fn to_string(&self, location_table: &LocationTable) -> String;
}
impl<A: Debug> FactCell for A {
default fn to_string(&self, _location_table: &LocationTable) -> String {
format!("{:?}", self)
}
}
impl FactCell for LocationIndex {
fn to_string(&self, location_table: &LocationTable) -> String {
format!("{:?}", location_table.to_location(*self))
}
}
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