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use std::borrow::Cow;
use rustc_middle::mir::{self, Body, MirPhase, RuntimePhase};
use rustc_middle::ty::TyCtxt;
use rustc_session::Session;
use crate::{validate, MirPass};
/// Just like `MirPass`, except it cannot mutate `Body`.
pub trait MirLint<'tcx> {
fn name(&self) -> Cow<'_, str> {
let name = std::any::type_name::<Self>();
if let Some(tail) = name.rfind(':') {
Cow::from(&name[tail + 1..])
} else {
Cow::from(name)
}
}
fn is_enabled(&self, _sess: &Session) -> bool {
true
}
fn run_lint(&self, tcx: TyCtxt<'tcx>, body: &Body<'tcx>);
}
/// An adapter for `MirLint`s that implements `MirPass`.
#[derive(Debug, Clone)]
pub struct Lint<T>(pub T);
impl<'tcx, T> MirPass<'tcx> for Lint<T>
where
T: MirLint<'tcx>,
{
fn name(&self) -> Cow<'_, str> {
self.0.name()
}
fn is_enabled(&self, sess: &Session) -> bool {
self.0.is_enabled(sess)
}
fn run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
self.0.run_lint(tcx, body)
}
fn is_mir_dump_enabled(&self) -> bool {
false
}
}
pub struct WithMinOptLevel<T>(pub u32, pub T);
impl<'tcx, T> MirPass<'tcx> for WithMinOptLevel<T>
where
T: MirPass<'tcx>,
{
fn name(&self) -> Cow<'_, str> {
self.1.name()
}
fn is_enabled(&self, sess: &Session) -> bool {
sess.mir_opt_level() >= self.0 as usize
}
fn run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
self.1.run_pass(tcx, body)
}
fn phase_change(&self) -> Option<MirPhase> {
self.1.phase_change()
}
}
/// Run the sequence of passes without validating the MIR after each pass. The MIR is still
/// validated at the end.
pub fn run_passes_no_validate<'tcx>(
tcx: TyCtxt<'tcx>,
body: &mut Body<'tcx>,
passes: &[&dyn MirPass<'tcx>],
) {
run_passes_inner(tcx, body, passes, false);
}
pub fn run_passes<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>, passes: &[&dyn MirPass<'tcx>]) {
run_passes_inner(tcx, body, passes, true);
}
fn run_passes_inner<'tcx>(
tcx: TyCtxt<'tcx>,
body: &mut Body<'tcx>,
passes: &[&dyn MirPass<'tcx>],
validate_each: bool,
) {
let start_phase = body.phase;
let mut cnt = 0;
let validate = validate_each & tcx.sess.opts.unstable_opts.validate_mir;
let overridden_passes = &tcx.sess.opts.unstable_opts.mir_enable_passes;
trace!(?overridden_passes);
for pass in passes {
let name = pass.name();
// Gather information about what we should be doing for this pass
let overridden =
overridden_passes.iter().rev().find(|(s, _)| s == &*name).map(|(_name, polarity)| {
trace!(
pass = %name,
"{} as requested by flag",
if *polarity { "Running" } else { "Not running" },
);
*polarity
});
let is_enabled = overridden.unwrap_or_else(|| pass.is_enabled(&tcx.sess));
let new_phase = pass.phase_change();
let dump_enabled = (is_enabled && pass.is_mir_dump_enabled()) || new_phase.is_some();
let validate = (validate && is_enabled)
|| new_phase == Some(MirPhase::Runtime(RuntimePhase::Optimized));
if dump_enabled {
dump_mir(tcx, body, start_phase, &name, cnt, false);
}
if is_enabled {
pass.run_pass(tcx, body);
}
if dump_enabled {
dump_mir(tcx, body, start_phase, &name, cnt, true);
cnt += 1;
}
if let Some(new_phase) = pass.phase_change() {
if body.phase >= new_phase {
panic!("Invalid MIR phase transition from {:?} to {:?}", body.phase, new_phase);
}
body.phase = new_phase;
}
if validate {
validate_body(tcx, body, format!("after pass {}", name));
}
}
}
pub fn validate_body<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>, when: String) {
validate::Validator { when, mir_phase: body.phase }.run_pass(tcx, body);
}
pub fn dump_mir<'tcx>(
tcx: TyCtxt<'tcx>,
body: &Body<'tcx>,
phase: MirPhase,
pass_name: &str,
cnt: usize,
is_after: bool,
) {
let phase_index = phase.phase_index();
mir::dump_mir(
tcx,
Some(&format_args!("{:03}-{:03}", phase_index, cnt)),
pass_name,
if is_after { &"after" } else { &"before" },
body,
|_, _| Ok(()),
);
}
|
