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[rust.git] / tests / codegen / debuginfo-generic-closure-env-names.rs
1 // This test checks that we get proper type names for closure environments and
2 // async-fn environments in debuginfo, especially making sure that generic arguments
3 // of the enclosing functions don't get lost.
4 //
5 // Unfortunately, the order that debuginfo gets emitted into LLVM IR becomes a bit hard
6 // to predict once async fns are involved, so DAG allows any order.
7 //
8 // Note that the test does not check async-fns when targeting MSVC because debuginfo for
9 // those does not follow the enum-fallback encoding yet and thus is incomplete.
10
11 // ignore-tidy-linelength
12
13 // Use the v0 symbol mangling scheme to codegen order independent of rustc version.
14 // Unnamed items like shims are generated in lexicographical order of their symbol name and in the
15 // legacy mangling scheme rustc version and generic parameters are both hashed into a single part
16 // of the name, thus randomizing item order with respect to rustc version.
17
18 // compile-flags: -Cdebuginfo=2 --edition 2021 -Copt-level=0 -Csymbol-mangling-version=v0
19
20 // non_generic_closure()
21 // NONMSVC: !DICompositeType(tag: DW_TAG_structure_type, name: "{closure_env#0}", scope: ![[non_generic_closure_NAMESPACE:[0-9]+]],
22 // MSVC: !DICompositeType(tag: DW_TAG_structure_type, name: "closure_env$0", scope: ![[non_generic_closure_NAMESPACE:[0-9]+]],
23 // CHECK: ![[non_generic_closure_NAMESPACE]] = !DINamespace(name: "non_generic_closure"
24
25 // CHECK: ![[function_containing_closure_NAMESPACE:[0-9]+]] = !DINamespace(name: "function_containing_closure"
26 // CHECK: ![[generic_async_function_NAMESPACE:[0-9]+]] = !DINamespace(name: "generic_async_function"
27 // CHECK: ![[generic_async_block_NAMESPACE:[0-9]+]] = !DINamespace(name: "generic_async_block"
28
29 // function_containing_closure<u32>()
30 // NONMSVC-DAG: !DICompositeType(tag: DW_TAG_structure_type, name: "{closure_env#0}<u32>", scope: ![[function_containing_closure_NAMESPACE]]
31 // MSVC-DAG: !DICompositeType(tag: DW_TAG_structure_type, name: "closure_env$0<u32>", scope: ![[function_containing_closure_NAMESPACE]]
32
33 // generic_async_function<Foo>()
34 // NONMSVC-DAG: !DICompositeType(tag: DW_TAG_structure_type, name: "{async_fn_env#0}<debuginfo_generic_closure_env_names::Foo>", scope: ![[generic_async_function_NAMESPACE]]
35
36 // generic_async_function<u32>()
37 // NONMSVC-DAG: !DICompositeType(tag: DW_TAG_structure_type, name: "{async_fn_env#0}<u32>", scope: ![[generic_async_function_NAMESPACE]]
38
39 // generic_async_block<Foo>()
40 // NONMSVC-DAG: !DICompositeType(tag: DW_TAG_structure_type, name: "{async_block_env#0}<debuginfo_generic_closure_env_names::Foo>", scope: ![[generic_async_block_NAMESPACE]]
41
42 // generic_async_block<u32>()
43 // NONMSVC-DAG: !DICompositeType(tag: DW_TAG_structure_type, name: "{async_block_env#0}<u32>", scope: ![[generic_async_block_NAMESPACE]]
44
45 // function_containing_closure<Foo>()
46 // NONMSVC-DAG: !DICompositeType(tag: DW_TAG_structure_type, name: "{closure_env#0}<debuginfo_generic_closure_env_names::Foo>", scope: ![[function_containing_closure_NAMESPACE]]
47 // MSVC-DAG: !DICompositeType(tag: DW_TAG_structure_type, name: "closure_env$0<debuginfo_generic_closure_env_names::Foo>", scope: ![[function_containing_closure_NAMESPACE]]
48
49
50 #![crate_type = "lib"]
51 use std::future::Future;
52
53 pub struct Foo;
54
55 pub fn non_generic_closure(x: Foo) -> Box<dyn FnOnce() -> Foo> {
56     return Box::new(move || x);
57 }
58
59 fn function_containing_closure<T: 'static>(x: T) -> impl FnOnce() -> T {
60     // This static only exists to trigger generating the namespace debuginfo for
61     // `function_containing_closure` at a predictable, early point, which makes
62     // writing the FileCheck tests above simpler.
63     static _X: u8 = 0;
64
65     return move || x;
66 }
67
68 async fn generic_async_function<T: 'static>(x: T) -> T {
69     static _X: u8 = 0; // Same as above
70     x
71 }
72
73 fn generic_async_block<T: 'static>(x: T) -> impl Future<Output=T> {
74     static _X: u8 = 0; // Same as above
75     async move {
76         x
77     }
78 }
79
80 pub fn instantiate_generics() {
81     let _closure_u32 = function_containing_closure(7u32);
82     let _closure_foo = function_containing_closure(Foo);
83
84     let _async_fn_u32 = generic_async_function(42u32);
85     let _async_fn_foo = generic_async_function(Foo);
86
87     let _async_block_u32 = generic_async_block(64u32);
88     let _async_block_foo = generic_async_block(Foo);
89 }