Refactor StableMir to avoid some clones.

Pass `args` to `run` instead of storing it in a field. This avoids the
need to clone it within `run`.

Also, change `args` from `Vec<String>` to `&[String]`, avoiding the need
for some vecs and clones.

Author: nnethercote

compiler/rustc_smir/src/rustc_internal/mod.rs

@@ -256,7 +256,7 @@ where
 ///         // Your code goes in here.
 /// #       ControlFlow::Continue(())
 ///     }
-/// #   let args = vec!["--verbose".to_string()];
+/// #   let args = &["--verbose".to_string()];
 ///     let result = run!(args, analyze_code);
 /// #   assert_eq!(result, Err(CompilerError::Skipped))
 /// # }
@@ -278,7 +278,7 @@ where
 ///         // Your code goes in here.
 /// #       ControlFlow::Continue(())
 ///     }
-/// #   let args = vec!["--verbose".to_string()];
+/// #   let args = &["--verbose".to_string()];
 /// #   let extra_args = vec![];
 ///     let result = run!(args, || analyze_code(extra_args));
 /// #   assert_eq!(result, Err(CompilerError::Skipped))
@@ -340,7 +340,6 @@ macro_rules! run_driver {
             C: Send,
             F: FnOnce($(optional!($with_tcx TyCtxt))?) -> ControlFlow<B, C> + Send,
         {
-            args: Vec<String>,
             callback: Option<F>,
             result: Option<ControlFlow<B, C>>,
         }
@@ -352,14 +351,14 @@ macro_rules! run_driver {
             F: FnOnce($(optional!($with_tcx TyCtxt))?) -> ControlFlow<B, C> + Send,
         {
             /// Creates a new `StableMir` instance, with given test_function and arguments.
-            pub fn new(args: Vec<String>, callback: F) -> Self {
-                StableMir { args, callback: Some(callback), result: None }
+            pub fn new(callback: F) -> Self {
+                StableMir { callback: Some(callback), result: None }
             }
 
             /// Runs the compiler against given target and tests it with `test_function`
-            pub fn run(&mut self) -> Result<C, CompilerError<B>> {
+            pub fn run(&mut self, args: &[String]) -> Result<C, CompilerError<B>> {
                 let compiler_result = rustc_driver::catch_fatal_errors(|| -> interface::Result::<()> {
-                    run_compiler(&self.args.clone(), self);
+                    run_compiler(&args, self);
                     Ok(())
                 });
                 match (compiler_result, self.result.take()) {
@@ -409,7 +408,7 @@ macro_rules! run_driver {
             }
         }
 
-        StableMir::new($args, $callback).run()
+        StableMir::new($callback).run($args)
     }};
 }
 

tests/ui-fulldeps/stable-mir/check_abi.rs

@@ -145,7 +145,7 @@ fn get_item<'a>(
 fn main() {
     let path = "alloc_input.rs";
     generate_input(&path).unwrap();
-    let args = vec![
+    let args = &[
         "rustc".to_string(),
         "--crate-type=lib".to_string(),
         "--crate-name".to_string(),

tests/ui-fulldeps/stable-mir/check_allocation.rs

@@ -219,7 +219,7 @@ fn get_item<'a>(
 fn main() {
     let path = "alloc_input.rs";
     generate_input(&path).unwrap();
-    let args = vec![
+    let args = &[
         "rustc".to_string(),
         "--edition=2021".to_string(),
         "--crate-name".to_string(),

tests/ui-fulldeps/stable-mir/check_assoc_items.rs

@@ -85,7 +85,7 @@ fn check_items<T: CrateDef>(items: &[T], expected: &[&str]) {
 fn main() {
     let path = "assoc_items.rs";
     generate_input(&path).unwrap();
-    let args = vec![
+    let args = &[
         "rustc".to_string(),
         "--crate-type=lib".to_string(),
         "--crate-name".to_string(),

tests/ui-fulldeps/stable-mir/check_attribute.rs

@@ -57,7 +57,7 @@ fn get_item<'a>(
 fn main() {
     let path = "attribute_input.rs";
     generate_input(&path).unwrap();
-    let args = vec![
+    let args = &[
         "rustc".to_string(),
         "--crate-type=lib".to_string(),
         "--crate-name".to_string(),

tests/ui-fulldeps/stable-mir/check_binop.rs

@@ -81,7 +81,7 @@ impl<'a> MirVisitor for Visitor<'a> {
 fn main() {
     let path = "binop_input.rs";
     generate_input(&path).unwrap();
-    let args = vec!["rustc".to_string(), "--crate-type=lib".to_string(), path.to_string()];
+    let args = &["rustc".to_string(), "--crate-type=lib".to_string(), path.to_string()];
     run!(args, test_binops).unwrap();
 }
 

tests/ui-fulldeps/stable-mir/check_crate_defs.rs

@@ -84,7 +84,7 @@ fn contains<T: CrateDef + std::fmt::Debug>(items: &[T], expected: &[&str]) {
 fn main() {
     let path = "crate_definitions.rs";
     generate_input(&path).unwrap();
-    let args = vec![
+    let args = &[
         "rustc".to_string(),
         "--crate-type=lib".to_string(),
         "--crate-name".to_string(),

tests/ui-fulldeps/stable-mir/check_def_ty.rs

@@ -76,7 +76,7 @@ fn check_fn_def(ty: Ty) {
 fn main() {
     let path = "defs_ty_input.rs";
     generate_input(&path).unwrap();
-    let args = vec![
+    let args = &[
         "rustc".to_string(),
         "-Cpanic=abort".to_string(),
         "--crate-name".to_string(),

tests/ui-fulldeps/stable-mir/check_defs.rs

@@ -112,7 +112,7 @@ fn get_instances(body: mir::Body) -> Vec<Instance> {
 fn main() {
     let path = "defs_input.rs";
     generate_input(&path).unwrap();
-    let args = vec![
+    let args = &[
         "rustc".to_string(),
         "-Cpanic=abort".to_string(),
         "--crate-name".to_string(),

tests/ui-fulldeps/stable-mir/check_foreign.rs

@@ -58,7 +58,7 @@ fn test_foreign() -> ControlFlow<()> {
 fn main() {
     let path = "foreign_input.rs";
     generate_input(&path).unwrap();
-    let args = vec![
+    let args = &[
         "rustc".to_string(),
         "-Cpanic=abort".to_string(),
         "--crate-type=lib".to_string(),