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Generate more precise generator names

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Currently all generators are named with a `generator$N` suffix,
regardless of where they come from. This means an `async fn` shows up as
a generator in stack traces, which can be surprising to async
programmers since they should not need to know that async functions are
implementated using generators.

This change generators a different name depending on the generator kind,
allowing us to tell whether the generator is the result of an async
block, an async closure, an async fn, or a plain generator.
This commit is contained in:
Eric Holk 2022-01-13 15:31:36 -08:00
parent 22e491ac7e
commit 05e1f0d769
2 changed files with 9 additions and 3 deletions
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10
compiler/rustc_codegen_ssa/src/debuginfo/type_names.rs
View File

@ -519,12 +519,18 @@ fn push_unqualified_item_name(
output.push_str(tcx.crate_name(def_id.krate).as_str());
}
DefPathData::ClosureExpr if tcx.generator_kind(def_id).is_some() => {
let key = match tcx.generator_kind(def_id).unwrap() {
hir::GeneratorKind::Async(hir::AsyncGeneratorKind::Block) => "async_block",
hir::GeneratorKind::Async(hir::AsyncGeneratorKind::Closure) => "async_closure",
hir::GeneratorKind::Async(hir::AsyncGeneratorKind::Fn) => "async_fn",
hir::GeneratorKind::Gen => "generator",
};
// Generators look like closures, but we want to treat them differently
// in the debug info.
if cpp_like_debuginfo(tcx) {
write!(output, "generator${}", disambiguated_data.disambiguator).unwrap();
write!(output, "{}${}", key, disambiguated_data.disambiguator).unwrap();
} else {
write!(output, "{{generator#{}}}", disambiguated_data.disambiguator).unwrap();
write!(output, "{{{}#{}}}", key, disambiguated_data.disambiguator).unwrap();
}
}
_ => match disambiguated_data.data.name() {

2
src/test/codegen/async-fn-debug-msvc.rs
View File

@ -17,7 +17,7 @@ async fn async_fn_test() {
// FIXME: No way to reliably check the filename.
// CHECK-DAG: [[ASYNC_FN:!.*]] = !DINamespace(name: "async_fn_test"
// CHECK-DAG: [[GEN:!.*]] = !DICompositeType(tag: DW_TAG_union_type, name: "generator$0"
// CHECK-DAG: [[GEN:!.*]] = !DICompositeType(tag: DW_TAG_union_type, name: "async_fn$0"
// CHECK: {{!.*}} = !DIDerivedType(tag: DW_TAG_member, name: "variant0", scope: [[GEN]],
// For brevity, we only check the struct name and members of the last variant.
// CHECK-SAME: file: [[FILE:![0-9]*]], line: 11,