Crater: closure size profile build

compiler/rustc_mir/src/monomorphize/util.rs

@@ -1,27 +1,18 @@
+use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
+use rustc_hir::def_id::LOCAL_CRATE;
 use rustc_middle::ty::{self, ClosureSizeProfileData, Instance, TyCtxt};
-use std::fs::OpenOptions;
-use std::io::prelude::*;
 
 /// For a given closure, writes out the data for the profiling the impact of RFC 2229 on
 /// closure size into a CSV.
 ///
 /// During the same compile all closures dump the information in the same file
 /// "closure_profile_XXXXX.csv", which is created in the directory where the compiler is invoked.
 crate fn dump_closure_profile(tcx: TyCtxt<'tcx>, closure_instance: Instance<'tcx>) {
-    let mut file = if let Ok(file) = OpenOptions::new()
-        .create(true)
-        .append(true)
-        .open(&format!("closure_profile_{}.csv", std::process::id()))
-    {
-        file
-    } else {
-        eprintln!("Cound't open file for writing closure profile");
-        return;
-    };
-
     let closure_def_id = closure_instance.def_id();
     let typeck_results = tcx.typeck(closure_def_id.expect_local());
 
+    let crate_name = tcx.crate_name(LOCAL_CRATE);
+
     if typeck_results.closure_size_eval.contains_key(&closure_def_id) {
         let param_env = ty::ParamEnv::reveal_all();
 
@@ -49,25 +40,10 @@ crate fn dump_closure_profile(tcx: TyCtxt<'tcx>, closure_instance: Instance<'tcx
             .map(|l| format!("{:?}", l.size.bytes()))
             .unwrap_or_else(|e| format!("Failed {:?}", e));
 
-        let closure_hir_id = tcx.hir().local_def_id_to_hir_id(closure_def_id.expect_local());
-        let closure_span = tcx.hir().span(closure_hir_id);
-        let src_file = tcx.sess.source_map().span_to_filename(closure_span);
-        let line_nos = tcx
-            .sess
-            .source_map()
-            .span_to_lines(closure_span)
-            .map(|l| format!("{:?} {:?}", l.lines.first(), l.lines.last()))
-            .unwrap_or_else(|e| format!("{:?}", e));
+        let mut hasher = StableHasher::new();
+        closure_instance.hash_stable(&mut tcx.create_stable_hashing_context(), &mut hasher);
+        let hash = hasher.finalize();
 
-        if let Err(e) = writeln!(
-            file,
-            "{}, {}, {}, {:?}",
-            old_size,
-            new_size,
-            src_file.prefer_local(),
-            line_nos
-        ) {
-            eprintln!("Error writting to file {}", e.to_string())
-        }
+        eprintln!("SG_CR_Eslkdjf: {}, {:x?}, {}, {}", crate_name, hash, old_size, new_size);
     }
 }