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1 | // Copyright 2017 The Rust Project Developers. See the COPYRIGHT |
2 | // file at the top-level directory of this distribution and at | |
3 | // http://rust-lang.org/COPYRIGHT. | |
4 | // | |
5 | // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | |
6 | // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | |
7 | // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | |
8 | // option. This file may not be copied, modified, or distributed | |
9 | // except according to those terms. | |
10 | ||
11 | // compile-flags: -C no-prepopulate-passes | |
12 | ||
13 | #![crate_type="lib"] | |
14 | #![feature(repr_transparent, repr_simd)] | |
15 | ||
16 | use std::marker::PhantomData; | |
17 | ||
18 | pub struct Zst1; | |
19 | pub struct Zst2(()); | |
20 | ||
21 | #[repr(transparent)] | |
22 | pub struct F32(f32); | |
23 | ||
24 | // CHECK: define float @test_F32(float %arg0) | |
25 | #[no_mangle] | |
26 | pub extern fn test_F32(_: F32) -> F32 { loop {} } | |
27 | ||
28 | #[repr(transparent)] | |
29 | pub struct Ptr(*mut u8); | |
30 | ||
31 | // CHECK: define i8* @test_Ptr(i8* %arg0) | |
32 | #[no_mangle] | |
33 | pub extern fn test_Ptr(_: Ptr) -> Ptr { loop {} } | |
34 | ||
35 | #[repr(transparent)] | |
36 | pub struct WithZst(u64, Zst1); | |
37 | ||
38 | // CHECK: define i64 @test_WithZst(i64 %arg0) | |
39 | #[no_mangle] | |
40 | pub extern fn test_WithZst(_: WithZst) -> WithZst { loop {} } | |
41 | ||
42 | #[repr(transparent)] | |
43 | pub struct WithZeroSizedArray(*const f32, [i8; 0]); | |
44 | ||
45 | // Apparently we use i32* when newtype-unwrapping f32 pointers. Whatever. | |
46 | // CHECK: define i32* @test_WithZeroSizedArray(i32* %arg0) | |
47 | #[no_mangle] | |
48 | pub extern fn test_WithZeroSizedArray(_: WithZeroSizedArray) -> WithZeroSizedArray { loop {} } | |
49 | ||
50 | #[repr(transparent)] | |
51 | pub struct Generic<T>(T); | |
52 | ||
53 | // CHECK: define double @test_Generic(double %arg0) | |
54 | #[no_mangle] | |
55 | pub extern fn test_Generic(_: Generic<f64>) -> Generic<f64> { loop {} } | |
56 | ||
57 | #[repr(transparent)] | |
58 | pub struct GenericPlusZst<T>(T, Zst2); | |
59 | ||
60 | #[repr(u8)] | |
61 | pub enum Bool { True, False, FileNotFound } | |
62 | ||
63 | // CHECK: define{{( zeroext)?}} i8 @test_Gpz(i8{{( zeroext)?}} %arg0) | |
64 | #[no_mangle] | |
65 | pub extern fn test_Gpz(_: GenericPlusZst<Bool>) -> GenericPlusZst<Bool> { loop {} } | |
66 | ||
67 | #[repr(transparent)] | |
68 | pub struct LifetimePhantom<'a, T: 'a>(*const T, PhantomData<&'a T>); | |
69 | ||
70 | // CHECK: define i16* @test_LifetimePhantom(i16* %arg0) | |
71 | #[no_mangle] | |
72 | pub extern fn test_LifetimePhantom(_: LifetimePhantom<i16>) -> LifetimePhantom<i16> { loop {} } | |
73 | ||
74 | // This works despite current alignment resrictions because PhantomData is always align(1) | |
75 | #[repr(transparent)] | |
76 | pub struct UnitPhantom<T, U> { val: T, unit: PhantomData<U> } | |
77 | ||
78 | pub struct Px; | |
79 | ||
80 | // CHECK: define float @test_UnitPhantom(float %arg0) | |
81 | #[no_mangle] | |
82 | pub extern fn test_UnitPhantom(_: UnitPhantom<f32, Px>) -> UnitPhantom<f32, Px> { loop {} } | |
83 | ||
84 | #[repr(transparent)] | |
85 | pub struct TwoZsts(Zst1, i8, Zst2); | |
86 | ||
87 | // CHECK: define{{( signext)?}} i8 @test_TwoZsts(i8{{( signext)?}} %arg0) | |
88 | #[no_mangle] | |
89 | pub extern fn test_TwoZsts(_: TwoZsts) -> TwoZsts { loop {} } | |
90 | ||
91 | #[repr(transparent)] | |
92 | pub struct Nested1(Zst2, Generic<f64>); | |
93 | ||
94 | // CHECK: define double @test_Nested1(double %arg0) | |
95 | #[no_mangle] | |
96 | pub extern fn test_Nested1(_: Nested1) -> Nested1 { loop {} } | |
97 | ||
98 | #[repr(transparent)] | |
99 | pub struct Nested2(Nested1, Zst1); | |
100 | ||
101 | // CHECK: define double @test_Nested2(double %arg0) | |
102 | #[no_mangle] | |
103 | pub extern fn test_Nested2(_: Nested2) -> Nested2 { loop {} } | |
104 | ||
105 | #[repr(simd)] | |
106 | struct f32x4(f32, f32, f32, f32); | |
107 | ||
108 | #[repr(transparent)] | |
109 | pub struct Vector(f32x4); | |
110 | ||
111 | // CHECK: define <4 x float> @test_Vector(<4 x float> %arg0) | |
112 | #[no_mangle] | |
113 | pub extern fn test_Vector(_: Vector) -> Vector { loop {} } | |
114 | ||
115 | trait Mirror { type It: ?Sized; } | |
116 | impl<T: ?Sized> Mirror for T { type It = Self; } | |
117 | ||
118 | #[repr(transparent)] | |
119 | pub struct StructWithProjection(<f32 as Mirror>::It); | |
120 | ||
121 | // CHECK: define float @test_Projection(float %arg0) | |
122 | #[no_mangle] | |
123 | pub extern fn test_Projection(_: StructWithProjection) -> StructWithProjection { loop {} } | |
124 | ||
125 | ||
126 | // All that remains to be tested are aggregates. They are tested in separate files called repr- | |
127 | // transparent-*.rs with `only-*` or `ignore-*` directives, because the expected LLVM IR | |
128 | // function signatures vary so much that it's not reasonably possible to cover all of them with a | |
129 | // single CHECK line. | |
130 | // | |
131 | // You may be wondering why we don't just compare the return types and argument types for equality | |
132 | // with FileCheck regex captures. Well, rustc doesn't perform newtype unwrapping on newtypes | |
133 | // containing aggregates. This is OK on all ABIs we support, but because LLVM has not gotten rid of | |
134 | // pointee types yet, the IR function signature will be syntactically different (%Foo* vs | |
135 | // %FooWrapper*). |