mirror of https://github.com/rust-lang/rust
90 lines
4.2 KiB
Rust
90 lines
4.2 KiB
Rust
// This test checks that we get proper type names for closure environments and
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// async-fn environments in debuginfo, especially making sure that generic arguments
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// of the enclosing functions don't get lost.
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//
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// Unfortunately, the order that debuginfo gets emitted into LLVM IR becomes a bit hard
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// to predict once async fns are involved, so DAG allows any order.
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//
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// Note that the test does not check async-fns when targeting MSVC because debuginfo for
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// those does not follow the enum-fallback encoding yet and thus is incomplete.
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// ignore-tidy-linelength
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// Use the v0 symbol mangling scheme to codegen order independent of rustc version.
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// Unnamed items like shims are generated in lexicographical order of their symbol name and in the
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// legacy mangling scheme rustc version and generic parameters are both hashed into a single part
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// of the name, thus randomizing item order with respect to rustc version.
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//@ compile-flags: -Cdebuginfo=2 --edition 2021 -Copt-level=0 -Csymbol-mangling-version=v0
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// non_generic_closure()
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// NONMSVC: !DICompositeType(tag: DW_TAG_structure_type, name: "{closure_env#0}", scope: ![[non_generic_closure_NAMESPACE:[0-9]+]],
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// MSVC: !DICompositeType(tag: DW_TAG_structure_type, name: "closure_env$0", scope: ![[non_generic_closure_NAMESPACE:[0-9]+]],
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// CHECK: ![[non_generic_closure_NAMESPACE]] = !DINamespace(name: "non_generic_closure"
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// CHECK: ![[function_containing_closure_NAMESPACE:[0-9]+]] = !DINamespace(name: "function_containing_closure"
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// CHECK: ![[generic_async_function_NAMESPACE:[0-9]+]] = !DINamespace(name: "generic_async_function"
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// CHECK: ![[generic_async_block_NAMESPACE:[0-9]+]] = !DINamespace(name: "generic_async_block"
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// function_containing_closure<u32>()
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// NONMSVC-DAG: !DICompositeType(tag: DW_TAG_structure_type, name: "{closure_env#0}<u32>", scope: ![[function_containing_closure_NAMESPACE]]
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// MSVC-DAG: !DICompositeType(tag: DW_TAG_structure_type, name: "closure_env$0<u32>", scope: ![[function_containing_closure_NAMESPACE]]
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// generic_async_function<Foo>()
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// NONMSVC-DAG: !DICompositeType(tag: DW_TAG_structure_type, name: "{async_fn_env#0}<debuginfo_generic_closure_env_names::Foo>", scope: ![[generic_async_function_NAMESPACE]]
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// generic_async_function<u32>()
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// NONMSVC-DAG: !DICompositeType(tag: DW_TAG_structure_type, name: "{async_fn_env#0}<u32>", scope: ![[generic_async_function_NAMESPACE]]
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// generic_async_block<Foo>()
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// NONMSVC-DAG: !DICompositeType(tag: DW_TAG_structure_type, name: "{async_block_env#0}<debuginfo_generic_closure_env_names::Foo>", scope: ![[generic_async_block_NAMESPACE]]
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// generic_async_block<u32>()
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// NONMSVC-DAG: !DICompositeType(tag: DW_TAG_structure_type, name: "{async_block_env#0}<u32>", scope: ![[generic_async_block_NAMESPACE]]
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// function_containing_closure<Foo>()
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// NONMSVC-DAG: !DICompositeType(tag: DW_TAG_structure_type, name: "{closure_env#0}<debuginfo_generic_closure_env_names::Foo>", scope: ![[function_containing_closure_NAMESPACE]]
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// MSVC-DAG: !DICompositeType(tag: DW_TAG_structure_type, name: "closure_env$0<debuginfo_generic_closure_env_names::Foo>", scope: ![[function_containing_closure_NAMESPACE]]
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#![crate_type = "lib"]
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use std::future::Future;
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pub struct Foo;
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pub fn non_generic_closure(x: Foo) -> Box<dyn FnOnce() -> Foo> {
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return Box::new(move || x);
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}
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fn function_containing_closure<T: 'static>(x: T) -> impl FnOnce() -> T {
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// This static only exists to trigger generating the namespace debuginfo for
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// `function_containing_closure` at a predictable, early point, which makes
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// writing the FileCheck tests above simpler.
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static _X: u8 = 0;
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return move || x;
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}
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async fn generic_async_function<T: 'static>(x: T) -> T {
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static _X: u8 = 0; // Same as above
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x
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}
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fn generic_async_block<T: 'static>(x: T) -> impl Future<Output=T> {
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static _X: u8 = 0; // Same as above
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async move {
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x
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}
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}
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pub fn instantiate_generics() {
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let _closure_u32 = function_containing_closure(7u32);
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let _closure_foo = function_containing_closure(Foo);
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let _async_fn_u32 = generic_async_function(42u32);
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let _async_fn_foo = generic_async_function(Foo);
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let _async_block_u32 = generic_async_block(64u32);
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let _async_block_foo = generic_async_block(Foo);
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}
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