Move /src/test to /tests

tests/codegen-units/polymorphization/unused_type_parameters.rs

@@ -0,0 +1,322 @@
+// compile-flags:-Zpolymorphize=on -Zprint-mono-items=lazy -Copt-level=1
+
+#![crate_type = "rlib"]
+
+// This test checks that the polymorphization analysis correctly reduces the
+// generated mono items.
+
+mod functions {
+    // Function doesn't have any type parameters to be unused.
+    pub fn no_parameters() {}
+
+//~ MONO_ITEM fn functions::no_parameters
+
+    // Function has an unused type parameter.
+    pub fn unused<T>() {
+    }
+
+//~ MONO_ITEM fn functions::unused::<T>
+
+    // Function uses type parameter in value of a binding.
+    pub fn used_binding_value<T: Default>() {
+        let _: T = Default::default();
+    }
+
+//~ MONO_ITEM fn functions::used_binding_value::<u32>
+//~ MONO_ITEM fn functions::used_binding_value::<u64>
+
+    // Function uses type parameter in type of a binding.
+    pub fn used_binding_type<T>() {
+        let _: Option<T> = None;
+    }
+
+//~ MONO_ITEM fn functions::used_binding_type::<u32>
+//~ MONO_ITEM fn functions::used_binding_type::<u64>
+
+    // Function uses type parameter in argument.
+    pub fn used_argument<T>(_: T) {
+    }
+
+//~ MONO_ITEM fn functions::used_argument::<u32>
+//~ MONO_ITEM fn functions::used_argument::<u64>
+//
+    // Function uses type parameter in substitutions to another function.
+    pub fn used_substs<T>() {
+        unused::<T>()
+    }
+
+//~ MONO_ITEM fn functions::used_substs::<u32>
+//~ MONO_ITEM fn functions::used_substs::<u64>
+}
+
+
+mod closures {
+    // Function doesn't have any type parameters to be unused.
+    pub fn no_parameters() {
+        let _ = || {};
+    }
+
+//~ MONO_ITEM fn closures::no_parameters
+
+    // Function has an unused type parameter in parent and closure.
+    pub fn unused<T>() -> u32 {
+        let add_one = |x: u32| x + 1;
+        add_one(3)
+    }
+
+//~ MONO_ITEM fn closures::unused::<T>::{closure#0}
+//~ MONO_ITEM fn closures::unused::<T>
+
+    // Function has an unused type parameter in closure, but not in parent.
+    pub fn used_parent<T: Default>() -> u32 {
+        let _: T = Default::default();
+        let add_one = |x: u32| x + 1;
+        add_one(3)
+    }
+
+//~ MONO_ITEM fn closures::used_parent::<T>::{closure#0}
+//~ MONO_ITEM fn closures::used_parent::<u32>
+//~ MONO_ITEM fn closures::used_parent::<u64>
+
+    // Function uses type parameter in value of a binding in closure.
+    pub fn used_binding_value<T: Default>() -> T {
+        let x = || {
+            let y: T = Default::default();
+            y
+        };
+
+        x()
+    }
+
+//~ MONO_ITEM fn closures::used_binding_value::<u32>::{closure#0}
+//~ MONO_ITEM fn closures::used_binding_value::<u64>::{closure#0}
+//~ MONO_ITEM fn closures::used_binding_value::<u32>
+//~ MONO_ITEM fn closures::used_binding_value::<u64>
+
+    // Function uses type parameter in type of a binding in closure.
+    pub fn used_binding_type<T>() -> Option<T> {
+        let x = || {
+            let y: Option<T> = None;
+            y
+        };
+
+        x()
+    }
+
+//~ MONO_ITEM fn closures::used_binding_type::<u32>::{closure#0}
+//~ MONO_ITEM fn closures::used_binding_type::<u64>::{closure#0}
+//~ MONO_ITEM fn closures::used_binding_type::<u32>
+//~ MONO_ITEM fn closures::used_binding_type::<u64>
+
+    // Function and closure uses type parameter in argument.
+    pub fn used_argument<T>(t: T) -> u32 {
+        let x = |_: T| 3;
+        x(t)
+    }
+
+//~ MONO_ITEM fn closures::used_argument::<u32>::{closure#0}
+//~ MONO_ITEM fn closures::used_argument::<u64>::{closure#0}
+//~ MONO_ITEM fn closures::used_argument::<u32>
+//~ MONO_ITEM fn closures::used_argument::<u64>
+
+    // Closure uses type parameter in argument.
+    pub fn used_argument_closure<T: Default>() -> u32 {
+        let t: T = Default::default();
+        let x = |_: T| 3;
+        x(t)
+    }
+
+//~ MONO_ITEM fn closures::used_argument_closure::<u32>::{closure#0}
+//~ MONO_ITEM fn closures::used_argument_closure::<u64>::{closure#0}
+//~ MONO_ITEM fn closures::used_argument_closure::<u32>
+//~ MONO_ITEM fn closures::used_argument_closure::<u64>
+
+    // Closure uses type parameter as upvar.
+    pub fn used_upvar<T: Default>() -> T {
+        let x: T = Default::default();
+        let y = || x;
+        y()
+    }
+
+//~ MONO_ITEM fn closures::used_upvar::<u32>::{closure#0}
+//~ MONO_ITEM fn closures::used_upvar::<u64>::{closure#0}
+//~ MONO_ITEM fn closures::used_upvar::<u32>
+//~ MONO_ITEM fn closures::used_upvar::<u64>
+
+    // Closure uses type parameter in substitutions to another function.
+    pub fn used_substs<T>() {
+        let x = || super::functions::unused::<T>();
+        x()
+    }
+
+//~ MONO_ITEM fn closures::used_substs::<u32>::{closure#0}
+//~ MONO_ITEM fn closures::used_substs::<u64>::{closure#0}
+//~ MONO_ITEM fn closures::used_substs::<u32>
+//~ MONO_ITEM fn closures::used_substs::<u64>
+}
+
+mod methods {
+    pub struct Foo<F>(F);
+
+    impl<F: Default> Foo<F> {
+        // Function has an unused type parameter from impl.
+        pub fn unused_impl() {
+        }
+
+//~ MONO_ITEM fn methods::Foo::<F>::unused_impl
+
+        // Function has an unused type parameter from impl and fn.
+        pub fn unused_both<G: Default>() {
+        }
+
+//~ MONO_ITEM fn methods::Foo::<F>::unused_both::<G>
+
+        // Function uses type parameter from impl.
+        pub fn used_impl() {
+            let _: F = Default::default();
+        }
+
+//~ MONO_ITEM fn methods::Foo::<u32>::used_impl
+//~ MONO_ITEM fn methods::Foo::<u64>::used_impl
+
+        // Function uses type parameter from impl.
+        pub fn used_fn<G: Default>() {
+            let _: G = Default::default();
+        }
+
+//~ MONO_ITEM fn methods::Foo::<F>::used_fn::<u32>
+//~ MONO_ITEM fn methods::Foo::<F>::used_fn::<u64>
+
+        // Function uses type parameter from impl.
+        pub fn used_both<G: Default>() {
+            let _: F = Default::default();
+            let _: G = Default::default();
+        }
+
+//~ MONO_ITEM fn methods::Foo::<u32>::used_both::<u32>
+//~ MONO_ITEM fn methods::Foo::<u64>::used_both::<u64>
+
+        // Function uses type parameter in substitutions to another function.
+        pub fn used_substs() {
+            super::functions::unused::<F>()
+        }
+
+//~ MONO_ITEM fn methods::Foo::<u32>::used_substs
+//~ MONO_ITEM fn methods::Foo::<u64>::used_substs
+
+        // Function has an unused type parameter from impl and fn.
+        pub fn closure_unused_all<G: Default>() -> u32 {
+            let add_one = |x: u32| x + 1;
+            add_one(3)
+        }
+
+//~ MONO_ITEM fn methods::Foo::<F>::closure_unused_all::<G>::{closure#0}
+//~ MONO_ITEM fn methods::Foo::<F>::closure_unused_all::<G>
+
+        // Function uses type parameter from impl and fn in closure.
+        pub fn closure_used_both<G: Default>() -> u32 {
+            let add_one = |x: u32| {
+                let _: F = Default::default();
+                let _: G = Default::default();
+                x + 1
+            };
+
+            add_one(3)
+        }
+
+//~ MONO_ITEM fn methods::Foo::<u32>::closure_used_both::<u32>::{closure#0}
+//~ MONO_ITEM fn methods::Foo::<u64>::closure_used_both::<u64>::{closure#0}
+//~ MONO_ITEM fn methods::Foo::<u32>::closure_used_both::<u32>
+//~ MONO_ITEM fn methods::Foo::<u64>::closure_used_both::<u64>
+
+        // Function uses type parameter from fn in closure.
+        pub fn closure_used_fn<G: Default>() -> u32 {
+            let add_one = |x: u32| {
+                let _: G = Default::default();
+                x + 1
+            };
+
+            add_one(3)
+        }
+
+//~ MONO_ITEM fn methods::Foo::<F>::closure_used_fn::<u32>::{closure#0}
+//~ MONO_ITEM fn methods::Foo::<F>::closure_used_fn::<u64>::{closure#0}
+//~ MONO_ITEM fn methods::Foo::<F>::closure_used_fn::<u32>
+//~ MONO_ITEM fn methods::Foo::<F>::closure_used_fn::<u64>
+
+        // Function uses type parameter from impl in closure.
+        pub fn closure_used_impl<G: Default>() -> u32 {
+            let add_one = |x: u32| {
+                let _: F = Default::default();
+                x + 1
+            };
+
+            add_one(3)
+        }
+
+//~ MONO_ITEM fn methods::Foo::<u32>::closure_used_impl::<G>::{closure#0}
+//~ MONO_ITEM fn methods::Foo::<u64>::closure_used_impl::<G>::{closure#0}
+//~ MONO_ITEM fn methods::Foo::<u32>::closure_used_impl::<G>
+//~ MONO_ITEM fn methods::Foo::<u64>::closure_used_impl::<G>
+
+        // Closure uses type parameter in substitutions to another function.
+        pub fn closure_used_substs() {
+            let x = || super::functions::unused::<F>();
+            x()
+        }
+
+//~ MONO_ITEM fn methods::Foo::<u32>::closure_used_substs::{closure#0}
+//~ MONO_ITEM fn methods::Foo::<u64>::closure_used_substs::{closure#0}
+//~ MONO_ITEM fn methods::Foo::<u32>::closure_used_substs
+//~ MONO_ITEM fn methods::Foo::<u64>::closure_used_substs
+    }
+}
+
+
+
+fn dispatch<T: Default>() {
+    functions::no_parameters();
+    functions::unused::<T>();
+    functions::used_binding_value::<T>();
+    functions::used_binding_type::<T>();
+    functions::used_argument::<T>(Default::default());
+    functions::used_substs::<T>();
+
+    closures::no_parameters();
+    let _ = closures::unused::<T>();
+    let _ = closures::used_parent::<T>();
+    let _ = closures::used_binding_value::<T>();
+    let _ = closures::used_binding_type::<T>();
+    let _ = closures::used_argument::<T>(Default::default());
+    let _ = closures::used_argument_closure::<T>();
+    let _ = closures::used_upvar::<T>();
+    let _ = closures::used_substs::<T>();
+
+    methods::Foo::<T>::unused_impl();
+    methods::Foo::<T>::unused_both::<T>();
+    methods::Foo::<T>::used_impl();
+    methods::Foo::<T>::used_fn::<T>();
+    methods::Foo::<T>::used_both::<T>();
+    methods::Foo::<T>::used_substs();
+    let _ = methods::Foo::<T>::closure_unused_all::<T>();
+    let _ = methods::Foo::<T>::closure_used_both::<T>();
+    let _ = methods::Foo::<T>::closure_used_impl::<T>();
+    let _ = methods::Foo::<T>::closure_used_fn::<T>();
+    let _ = methods::Foo::<T>::closure_used_substs();
+}
+
+//~ MONO_ITEM fn dispatch::<u32>
+//~ MONO_ITEM fn dispatch::<u64>
+
+pub fn foo() {
+    // Generate two copies of each function to check that where the type parameter is unused,
+    // there is only a single copy.
+    dispatch::<u32>();
+    dispatch::<u64>();
+}
+
+//~ MONO_ITEM fn foo @@ unused_type_parameters-cgu.0[External]
+
+// These are all the items that aren't relevant to the test.
+//~ MONO_ITEM fn <u32 as std::default::Default>::default
+//~ MONO_ITEM fn <u64 as std::default::Default>::default