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Original file line number | Diff line number | Diff line change |
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use std::borrow::Cow; | ||
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use rustc_middle::mir::{self, Body, MirPhase}; | ||
use rustc_middle::ty::TyCtxt; | ||
use rustc_session::Session; | ||
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use crate::{validate, MirPass}; | ||
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/// 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) | ||
} | ||
} | ||
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fn is_enabled(&self, _sess: &Session) -> bool { | ||
true | ||
} | ||
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fn run_lint(&self, tcx: TyCtxt<'tcx>, body: &Body<'tcx>); | ||
} | ||
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/// An adapter for `MirLint`s that implements `MirPass`. | ||
#[derive(Debug, Clone)] | ||
pub struct Lint<T>(pub T); | ||
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impl<T> MirPass<'tcx> for Lint<T> | ||
where | ||
T: MirLint<'tcx>, | ||
{ | ||
fn name(&self) -> Cow<'_, str> { | ||
self.0.name() | ||
} | ||
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fn is_enabled(&self, sess: &Session) -> bool { | ||
self.0.is_enabled(sess) | ||
} | ||
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fn run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) { | ||
self.0.run_lint(tcx, body) | ||
} | ||
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fn is_mir_dump_enabled(&self) -> bool { | ||
false | ||
} | ||
} | ||
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pub fn run_passes(tcx: TyCtxt<'tcx>, body: &'mir mut Body<'tcx>, passes: &[&dyn MirPass<'tcx>]) { | ||
let start_phase = body.phase; | ||
let mut cnt = 0; | ||
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let validate = tcx.sess.opts.debugging_opts.validate_mir; | ||
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if validate { | ||
validate_body(tcx, body, format!("start of phase transition from {:?}", start_phase)); | ||
} | ||
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for pass in passes { | ||
if !pass.is_enabled(&tcx.sess) { | ||
continue; | ||
} | ||
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let name = pass.name(); | ||
let dump_enabled = pass.is_mir_dump_enabled(); | ||
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if dump_enabled { | ||
dump_mir(tcx, body, start_phase, &name, cnt, false); | ||
} | ||
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pass.run_pass(tcx, body); | ||
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if dump_enabled { | ||
dump_mir(tcx, body, start_phase, &name, cnt, true); | ||
cnt += 1; | ||
} | ||
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if let Some(new_phase) = pass.phase_change() { | ||
if body.phase >= new_phase { | ||
panic!("Invalid MIR phase transition from {:?} to {:?}", body.phase, new_phase); | ||
} | ||
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body.phase = new_phase; | ||
} | ||
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if validate { | ||
validate_body(tcx, body, format!("after pass {}", pass.name())); | ||
} | ||
} | ||
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if validate || body.phase == MirPhase::Optimization { | ||
validate_body(tcx, body, format!("end of phase transition to {:?}", body.phase)); | ||
} | ||
} | ||
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pub fn validate_body(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>, when: String) { | ||
validate::Validator { when, mir_phase: body.phase }.run_pass(tcx, body); | ||
} | ||
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pub fn dump_mir( | ||
tcx: TyCtxt<'tcx>, | ||
body: &Body<'tcx>, | ||
phase: MirPhase, | ||
pass_name: &str, | ||
cnt: usize, | ||
is_after: bool, | ||
) { | ||
let phase_index = phase as u32; | ||
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mir::dump_mir( | ||
tcx, | ||
Some(&format_args!("{:03}-{:03}", phase_index, cnt)), | ||
pass_name, | ||
if is_after { &"after" } else { &"before" }, | ||
body, | ||
|_, _| Ok(()), | ||
); | ||
} |