src/librustc_mir/transform/dump_mir.rs

   1 //! This pass just dumps MIR at a specified point.
   2
   3 use std::borrow::Cow;
   4 use std::fmt;
   5 use std::fs::File;
   6 use std::io;
   7
   8 use crate::transform::{MirPass, MirSource};
   9 use crate::util as mir_util;
  10 use rustc_middle::mir::Body;
  11 use rustc_middle::ty::TyCtxt;
  12 use rustc_session::config::{OutputFilenames, OutputType};
  13
  14 pub struct Marker(pub &'static str);
  15
  16 impl<'tcx> MirPass<'tcx> for Marker {
  17     fn name(&self) -> Cow<'_, str> {
  18         Cow::Borrowed(self.0)
  19     }
  20
  21     fn run_pass(&self, _tcx: TyCtxt<'tcx>, _source: MirSource<'tcx>, _body: &mut Body<'tcx>) {}
  22 }
  23
  24 pub struct Disambiguator {
  25     is_after: bool,
  26 }
  27
  28 impl fmt::Display for Disambiguator {
  29     fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
  30         let title = if self.is_after { "after" } else { "before" };
  31         write!(formatter, "{}", title)
  32     }
  33 }
  34
  35 pub fn on_mir_pass<'tcx>(
  36     tcx: TyCtxt<'tcx>,
  37     pass_num: &dyn fmt::Display,
  38     pass_name: &str,
  39     source: MirSource<'tcx>,
  40     body: &Body<'tcx>,
  41     is_after: bool,
  42 ) {
  43     if mir_util::dump_enabled(tcx, pass_name, source.def_id()) {
  44         mir_util::dump_mir(
  45             tcx,
  46             Some(pass_num),
  47             pass_name,
  48             &Disambiguator { is_after },
  49             source,
  50             body,
  51             |_, _| Ok(()),
  52         );
  53     }
  54 }
  55
  56 pub fn emit_mir(tcx: TyCtxt<'_>, outputs: &OutputFilenames) -> io::Result<()> {
  57     let path = outputs.path(OutputType::Mir);
  58     let mut f = io::BufWriter::new(File::create(&path)?);
  59     mir_util::write_mir_pretty(tcx, None, &mut f)?;
  60     Ok(())
  61 }