Add helper alloc_os_str_as_c_str and use it in env_var emulation

benches/fibonacci.rs

@@ -7,7 +7,7 @@ use crate::helpers::*;
 
 #[bench]
 fn fib(bencher: &mut Bencher) {
-    bencher.iter(|| fibonacci_helper::main())
+    bencher.iter(|| { fibonacci_helper::main(); })
 }
 
 #[bench]
@@ -17,7 +17,7 @@ fn fib_miri(bencher: &mut Bencher) {
 
 #[bench]
 fn fib_iter(bencher: &mut Bencher) {
-    bencher.iter(|| fibonacci_helper_iterative::main())
+    bencher.iter(|| { fibonacci_helper_iterative::main(); })
 }
 
 #[bench]

benches/helpers/miri_helper.rs

@@ -6,26 +6,23 @@ extern crate rustc_interface;
 extern crate test;
 
 use self::miri::eval_main;
-use crate::test::Bencher;
 use rustc::hir::def_id::LOCAL_CRATE;
-use rustc_driver::Compilation;
 use rustc_interface::{interface, Queries};
+use rustc_driver::Compilation;
+use crate::test::Bencher;
 
 struct MiriCompilerCalls<'a> {
     bencher: &'a mut Bencher,
 }
 
 impl rustc_driver::Callbacks for MiriCompilerCalls<'_> {
-    fn after_analysis<'tcx>(
-        &mut self,
-        compiler: &interface::Compiler,
-        queries: &'tcx Queries<'tcx>,
-    ) -> Compilation {
+    fn after_analysis<'tcx>(&mut self, compiler: &interface::Compiler, queries: &'tcx Queries<'tcx>) -> Compilation {
         compiler.session().abort_if_errors();
 
         queries.global_ctxt().unwrap().peek_mut().enter(|tcx| {
-            let (entry_def_id, _) =
-                tcx.entry_fn(LOCAL_CRATE).expect("no main or start function found");
+            let (entry_def_id, _) = tcx.entry_fn(LOCAL_CRATE).expect(
+                "no main or start function found",
+            );
 
             self.bencher.iter(|| {
                 let config = miri::MiriConfig {
@@ -53,9 +50,13 @@ fn find_sysroot() -> String {
     let toolchain = option_env!("RUSTUP_TOOLCHAIN").or(option_env!("MULTIRUST_TOOLCHAIN"));
     match (home, toolchain) {
         (Some(home), Some(toolchain)) => format!("{}/toolchains/{}", home, toolchain),
-        _ => option_env!("RUST_SYSROOT")
-            .expect("need to specify RUST_SYSROOT env var or use rustup or multirust")
-            .to_owned(),
+        _ => {
+            option_env!("RUST_SYSROOT")
+                .expect(
+                    "need to specify RUST_SYSROOT env var or use rustup or multirust",
+                )
+                .to_owned()
+        }
     }
 }
 

benches/smoke.rs

@@ -7,7 +7,7 @@ use crate::helpers::*;
 
 #[bench]
 fn noop(bencher: &mut Bencher) {
-    bencher.iter(|| smoke_helper::main())
+    bencher.iter(|| { smoke_helper::main(); })
 }
 
 /*

rust-version

@@ -1 +1 @@
-9ae6cedb8d1e37469be1434642a3e403fce50a03
+a605441e049f0b6d5f7715b94b8ac4662fd7fcf6