src/test/codegen-units/partitioning/vtable-through-const.rs

   1 // ignore-tidy-linelength
   2
   3 // We specify -C incremental here because we want to test the partitioning for
   4 // incremental compilation
   5 // compile-flags:-Zprint-mono-items=lazy -Cincremental=tmp/partitioning-tests/vtable-through-const
   6 // compile-flags:-Zinline-in-all-cgus
   7
   8 // This test case makes sure, that references made through constants are
   9 // recorded properly in the InliningMap.
  10
  11 #![feature(start)]
  12
  13 mod mod1 {
  14     pub trait Trait1 {
  15         fn do_something(&self) {}
  16         fn do_something_else(&self) {}
  17     }
  18
  19     impl Trait1 for u32 {}
  20
  21     pub trait Trait1Gen<T> {
  22         fn do_something(&self, x: T) -> T;
  23         fn do_something_else(&self, x: T) -> T;
  24     }
  25
  26     impl<T> Trait1Gen<T> for u32 {
  27         fn do_something(&self, x: T) -> T { x }
  28         fn do_something_else(&self, x: T) -> T { x }
  29     }
  30
  31     //~ MONO_ITEM fn mod1::id::<i64> @@ vtable_through_const-mod1.volatile[Internal]
  32     fn id<T>(x: T) -> T { x }
  33
  34     // These are referenced, so they produce mono-items (see start())
  35     pub const TRAIT1_REF: &'static Trait1 = &0u32 as &Trait1;
  36     pub const TRAIT1_GEN_REF: &'static Trait1Gen<u8> = &0u32 as &Trait1Gen<u8>;
  37     pub const ID_CHAR: fn(char) -> char = id::<char>;
  38
  39
  40
  41     pub trait Trait2 {
  42         fn do_something(&self) {}
  43         fn do_something_else(&self) {}
  44     }
  45
  46     //~ MONO_ITEM fn <u32 as mod1::Trait2>::do_something @@ vtable_through_const-mod1.volatile[Internal]
  47     //~ MONO_ITEM fn <u32 as mod1::Trait2>::do_something_else @@ vtable_through_const-mod1.volatile[Internal]
  48     impl Trait2 for u32 {}
  49
  50     pub trait Trait2Gen<T> {
  51         fn do_something(&self, x: T) -> T;
  52         fn do_something_else(&self, x: T) -> T;
  53     }
  54
  55     impl<T> Trait2Gen<T> for u32 {
  56         fn do_something(&self, x: T) -> T { x }
  57         fn do_something_else(&self, x: T) -> T { x }
  58     }
  59
  60     // These are not referenced, so they do not produce mono-items
  61     pub const TRAIT2_REF: &'static Trait2 = &0u32 as &Trait2;
  62     pub const TRAIT2_GEN_REF: &'static Trait2Gen<u8> = &0u32 as &Trait2Gen<u8>;
  63     pub const ID_I64: fn(i64) -> i64 = id::<i64>;
  64 }
  65
  66 //~ MONO_ITEM fn start
  67 #[start]
  68 fn start(_: isize, _: *const *const u8) -> isize {
  69     //~ MONO_ITEM fn std::ptr::drop_in_place::<u32> - shim(None) @@ vtable_through_const[Internal]
  70
  71     // Since Trait1::do_something() is instantiated via its default implementation,
  72     // it is considered a generic and is instantiated here only because it is
  73     // referenced in this module.
  74     //~ MONO_ITEM fn <u32 as mod1::Trait1>::do_something_else @@ vtable_through_const-mod1.volatile[External]
  75
  76     // Although it is never used, Trait1::do_something_else() has to be
  77     // instantiated locally here too, otherwise the <&u32 as &Trait1> vtable
  78     // could not be fully constructed.
  79     //~ MONO_ITEM fn <u32 as mod1::Trait1>::do_something @@ vtable_through_const-mod1.volatile[External]
  80     mod1::TRAIT1_REF.do_something();
  81
  82     // Same as above
  83     //~ MONO_ITEM fn <u32 as mod1::Trait1Gen<u8>>::do_something @@ vtable_through_const-mod1.volatile[External]
  84     //~ MONO_ITEM fn <u32 as mod1::Trait1Gen<u8>>::do_something_else @@ vtable_through_const-mod1.volatile[External]
  85     //~ MONO_ITEM fn <u32 as mod1::Trait2Gen<u8>>::do_something @@ vtable_through_const-mod1.volatile[Internal]
  86     //~ MONO_ITEM fn <u32 as mod1::Trait2Gen<u8>>::do_something_else @@ vtable_through_const-mod1.volatile[Internal]
  87     mod1::TRAIT1_GEN_REF.do_something(0u8);
  88
  89     //~ MONO_ITEM fn mod1::id::<char> @@ vtable_through_const-mod1.volatile[External]
  90     mod1::ID_CHAR('x');
  91
  92     0
  93 }