Move the dataflow framework to its own crate.

compiler/rustc_middle/src/mir/mod.rs

@@ -42,11 +42,17 @@ pub use self::query::*;
 
 pub mod abstract_const;
 pub mod coverage;
+mod generic_graph;
+pub mod generic_graphviz;
 mod graph_cyclic_cache;
+pub mod graphviz;
 pub mod interpret;
 pub mod mono;
+pub mod patch;
 mod predecessors;
+pub mod pretty;
 mod query;
+pub mod spanview;
 pub mod tcx;
 pub mod terminator;
 pub use terminator::*;
@@ -54,6 +60,12 @@ pub mod traversal;
 mod type_foldable;
 pub mod visit;
 
+pub use self::generic_graph::graphviz_safe_def_name;
+pub use self::graphviz::write_mir_graphviz;
+pub use self::pretty::{
+    create_dump_file, display_allocation, dump_enabled, dump_mir, write_mir_pretty, PassWhere,
+};
+
 /// Types for locals
 pub type LocalDecls<'tcx> = IndexVec<Local, LocalDecl<'tcx>>;
 
@@ -75,6 +87,22 @@ impl<'tcx> HasLocalDecls<'tcx> for Body<'tcx> {
     }
 }
 
+/// A streamlined trait that you can implement to create a pass; the
+/// pass will be named after the type, and it will consist of a main
+/// loop that goes over each available MIR and applies `run_pass`.
+pub trait MirPass<'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 run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>);
+}
+
 /// The various "big phases" that MIR goes through.
 ///
 /// These phases all describe dialects of MIR. Since all MIR uses the same datastructures, the