Use break api config for pass by value or ref

Author: camsteffen

clippy_lints/src/lib.rs

@@ -1947,6 +1947,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
     let pass_by_ref_or_value = pass_by_ref_or_value::PassByRefOrValue::new(
         conf.trivial_copy_size_limit,
         conf.pass_by_value_size_limit,
+        conf.avoid_breaking_exported_api,
         &sess.target,
     );
     store.register_late_pass(move || box pass_by_ref_or_value);

clippy_lints/src/pass_by_ref_or_value.rs

@@ -102,10 +102,16 @@ declare_clippy_lint! {
 pub struct PassByRefOrValue {
     ref_min_size: u64,
     value_max_size: u64,
+    avoid_breaking_exported_api: bool,
 }
 
 impl<'tcx> PassByRefOrValue {
-    pub fn new(ref_min_size: Option<u64>, value_max_size: u64, target: &Target) -> Self {
+    pub fn new(
+        ref_min_size: Option<u64>,
+        value_max_size: u64,
+        avoid_breaking_exported_api: bool,
+        target: &Target,
+    ) -> Self {
         let ref_min_size = ref_min_size.unwrap_or_else(|| {
             let bit_width = u64::from(target.pointer_width);
             // Cap the calculated bit width at 32-bits to reduce
@@ -120,10 +126,14 @@ impl<'tcx> PassByRefOrValue {
         Self {
             ref_min_size,
             value_max_size,
+            avoid_breaking_exported_api,
         }
     }
 
     fn check_poly_fn(&mut self, cx: &LateContext<'tcx>, hir_id: HirId, decl: &FnDecl<'_>, span: Option<Span>) {
+        if self.avoid_breaking_exported_api && cx.access_levels.is_exported(hir_id) {
+            return;
+        }
         let fn_def_id = cx.tcx.hir().local_def_id(hir_id);
 
         let fn_sig = cx.tcx.fn_sig(fn_def_id);
@@ -184,7 +194,6 @@ impl<'tcx> PassByRefOrValue {
                     }
 
                     if_chain! {
-                        if !cx.access_levels.is_exported(hir_id);
                         if is_copy(cx, ty);
                         if !is_self_ty(input);
                         if let Some(size) = cx.layout_of(ty).ok().map(|l| l.size.bytes());

tests/ui/trivially_copy_pass_by_ref.stderr

@@ -88,12 +88,6 @@ error: this argument (N byte) is passed by reference, but would be more efficien
 LL |     fn trait_method(&self, _foo: &Foo);
    |                                  ^^^^ help: consider passing by value instead: `Foo`
 
-error: this argument (N byte) is passed by reference, but would be more efficient if passed by value (limit: N byte)
-  --> $DIR/trivially_copy_pass_by_ref.rs:80:37
-   |
-LL |     fn trait_method2(&self, _color: &Color);
-   |                                     ^^^^^^ help: consider passing by value instead: `Color`
-
 error: this argument (N byte) is passed by reference, but would be more efficient if passed by value (limit: N byte)
   --> $DIR/trivially_copy_pass_by_ref.rs:108:21
    |
@@ -106,5 +100,5 @@ error: this argument (N byte) is passed by reference, but would be more efficien
 LL |     fn foo(x: &i32) {
    |               ^^^^ help: consider passing by value instead: `i32`
 
-error: aborting due to 17 previous errors
+error: aborting due to 16 previous errors