3 use rustc_middle::mir::{self, Body, MirPhase, RuntimePhase};
4 use rustc_middle::ty::TyCtxt;
5 use rustc_session::Session;
7 use crate::{validate, MirPass};
9 /// Just like `MirPass`, except it cannot mutate `Body`.
10 pub trait MirLint<'tcx> {
11 fn name(&self) -> Cow<'_, str> {
12 let name = std::any::type_name::<Self>();
13 if let Some(tail) = name.rfind(':') {
14 Cow::from(&name[tail + 1..])
20 fn is_enabled(&self, _sess: &Session) -> bool {
24 fn run_lint(&self, tcx: TyCtxt<'tcx>, body: &Body<'tcx>);
27 /// An adapter for `MirLint`s that implements `MirPass`.
28 #[derive(Debug, Clone)]
29 pub struct Lint<T>(pub T);
31 impl<'tcx, T> MirPass<'tcx> for Lint<T>
35 fn name(&self) -> Cow<'_, str> {
39 fn is_enabled(&self, sess: &Session) -> bool {
40 self.0.is_enabled(sess)
43 fn run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
44 self.0.run_lint(tcx, body)
47 fn is_mir_dump_enabled(&self) -> bool {
52 pub struct WithMinOptLevel<T>(pub u32, pub T);
54 impl<'tcx, T> MirPass<'tcx> for WithMinOptLevel<T>
58 fn name(&self) -> Cow<'_, str> {
62 fn is_enabled(&self, sess: &Session) -> bool {
63 sess.mir_opt_level() >= self.0 as usize
66 fn run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
67 self.1.run_pass(tcx, body)
70 fn phase_change(&self) -> Option<MirPhase> {
75 /// Run the sequence of passes without validating the MIR after each pass. The MIR is still
76 /// validated at the end.
77 pub fn run_passes_no_validate<'tcx>(
79 body: &mut Body<'tcx>,
80 passes: &[&dyn MirPass<'tcx>],
82 run_passes_inner(tcx, body, passes, false);
85 pub fn run_passes<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>, passes: &[&dyn MirPass<'tcx>]) {
86 run_passes_inner(tcx, body, passes, true);
89 fn run_passes_inner<'tcx>(
91 body: &mut Body<'tcx>,
92 passes: &[&dyn MirPass<'tcx>],
95 let start_phase = body.phase;
98 let validate = validate_each & tcx.sess.opts.unstable_opts.validate_mir;
99 let overridden_passes = &tcx.sess.opts.unstable_opts.mir_enable_passes;
100 trace!(?overridden_passes);
103 let name = pass.name();
105 // Gather information about what we should be doing for this pass
107 overridden_passes.iter().rev().find(|(s, _)| s == &*name).map(|(_name, polarity)| {
110 "{} as requested by flag",
111 if *polarity { "Running" } else { "Not running" },
115 let is_enabled = overriden.unwrap_or_else(|| pass.is_enabled(&tcx.sess));
116 let new_phase = pass.phase_change();
117 let dump_enabled = (is_enabled && pass.is_mir_dump_enabled()) || new_phase.is_some();
118 let validate = (validate && is_enabled)
119 || new_phase == Some(MirPhase::Runtime(RuntimePhase::Optimized));
122 dump_mir(tcx, body, start_phase, &name, cnt, false);
125 pass.run_pass(tcx, body);
128 dump_mir(tcx, body, start_phase, &name, cnt, true);
131 if let Some(new_phase) = pass.phase_change() {
132 if body.phase >= new_phase {
133 panic!("Invalid MIR phase transition from {:?} to {:?}", body.phase, new_phase);
136 body.phase = new_phase;
139 validate_body(tcx, body, format!("after pass {}", name));
144 pub fn validate_body<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>, when: String) {
145 validate::Validator { when, mir_phase: body.phase }.run_pass(tcx, body);
148 pub fn dump_mir<'tcx>(
156 let phase_index = phase.phase_index();
160 Some(&format_args!("{:03}-{:03}", phase_index, cnt)),
162 if is_after { &"after" } else { &"before" },