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