Make the translation item collector handle *uses* of 'const' items instead of declarations.

1 files changed, 93 insertions, 0 deletions

diff --git a/src/test/codegen-units/partitioning/vtable-through-const.rs b/src/test/codegen-units/partitioning/vtable-through-const.rs
new file mode 100644
index 00000000000..b40bb7f6097
--- /dev/null
+++ b/src/test/codegen-units/partitioning/vtable-through-const.rs
@@ -0,0 +1,93 @@
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// ignore-tidy-linelength
+
+// We specify -Z incremental here because we want to test the partitioning for
+// incremental compilation
+// compile-flags:-Zprint-trans-items=lazy -Zincremental=tmp/partitioning-tests/vtable-through-const
+
+// This test case makes sure, that references made through constants are
+// recorded properly in the InliningMap.
+
+mod mod1 {
+    pub trait Trait1 {
+        fn do_something(&self) {}
+        fn do_something_else(&self) {}
+    }
+
+    impl Trait1 for u32 {}
+
+    pub trait Trait1Gen<T> {
+        fn do_something(&self, x: T) -> T;
+        fn do_something_else(&self, x: T) -> T;
+    }
+
+    impl<T> Trait1Gen<T> for u32 {
+        fn do_something(&self, x: T) -> T { x }
+        fn do_something_else(&self, x: T) -> T { x }
+    }
+
+    fn id<T>(x: T) -> T { x }
+
+    // These are referenced, so they produce trans-items (see main())
+    pub const TRAIT1_REF: &'static Trait1 = &0u32 as &Trait1;
+    pub const TRAIT1_GEN_REF: &'static Trait1Gen<u8> = &0u32 as &Trait1Gen<u8>;
+    pub const ID_CHAR: fn(char) -> char = id::<char>;
+
+
+
+    pub trait Trait2 {
+        fn do_something(&self) {}
+        fn do_something_else(&self) {}
+    }
+
+    impl Trait2 for u32 {}
+
+    pub trait Trait2Gen<T> {
+        fn do_something(&self, x: T) -> T;
+        fn do_something_else(&self, x: T) -> T;
+    }
+
+    impl<T> Trait2Gen<T> for u32 {
+        fn do_something(&self, x: T) -> T { x }
+        fn do_something_else(&self, x: T) -> T { x }
+    }
+
+    // These are not referenced, so they do not produce trans-items
+    pub const TRAIT2_REF: &'static Trait2 = &0u32 as &Trait2;
+    pub const TRAIT2_GEN_REF: &'static Trait2Gen<u8> = &0u32 as &Trait2Gen<u8>;
+    pub const ID_I64: fn(i64) -> i64 = id::<i64>;
+}
+
+//~ TRANS_ITEM fn vtable_through_const::main[0] @@ vtable_through_const[External]
+fn main() {
+
+    // Since Trait1::do_something() is instantiated via its default implementation,
+    // it is considered a generic and is instantiated here only because it is
+    // referenced in this module.
+    //~ TRANS_ITEM fn vtable_through_const::mod1[0]::Trait1[0]::do_something_else[0]<u32> @@ vtable_through_const[Internal]
+
+    // Although it is never used, Trait1::do_something_else() has to be
+    // instantiated locally here too, otherwise the <&u32 as &Trait1> vtable
+    // could not be fully constructed.
+    //~ TRANS_ITEM fn vtable_through_const::mod1[0]::Trait1[0]::do_something[0]<u32> @@ vtable_through_const[Internal]
+    mod1::TRAIT1_REF.do_something();
+
+    // Same as above
+    //~ TRANS_ITEM fn vtable_through_const::mod1[0]::{{impl}}[1]::do_something[0]<u8> @@ vtable_through_const[Internal]
+    //~ TRANS_ITEM fn vtable_through_const::mod1[0]::{{impl}}[1]::do_something_else[0]<u8> @@ vtable_through_const[Internal]
+    mod1::TRAIT1_GEN_REF.do_something(0u8);
+
+    //~ TRANS_ITEM fn vtable_through_const::mod1[0]::id[0]<char> @@ vtable_through_const[Internal]
+    mod1::ID_CHAR('x');
+}
+
+//~ TRANS_ITEM drop-glue i8