aac8a88552
There are several cases where names of types and functions in the debug info are either ambiguous, or not helpful, such as including ambiguous placeholders (e.g., `{{impl}}`, `{{closure}}` or `dyn _'`) or dropping qualifications (e.g., for dynamic types).
Instead, each debug symbol name should be unique and useful:
* Include disambiguators for anonymous `DefPathDataName` (closures and generators), and unify their formatting when used as a path-qualifier vs item being qualified.
* Qualify the principal trait for dynamic types.
* If there is no principal trait for a dynamic type, emit all other traits instead.
* Respect the `qualified` argument when emitting ref and pointer types.
* For implementations, emit the disambiguator.
* Print const generics when emitting generic parameters or arguments.
Additionally, when targeting MSVC, its debugger treats many command arguments as C++ expressions, even when the argument is defined to be a symbol name. As such names in the debug info need to be more C++-like to be parsed correctly:
* Avoid characters with special meaning (`#`, `[`, `"`, `+`).
* Never start a name with `<` or `{` as this is treated as an operator.
* `>>` is always treated as a right-shift, even when parsing generic arguments (so add a space to avoid this).
* Emit function declarations using C/C++ style syntax (e.g., leading return type).
* Emit arrays as a synthetic `array$<type, size>` type.
* Include a `$` in all synthetic types as this is a legal character for C++, but not Rust (thus we avoid collisions with user types).
63 lines
2.4 KiB
Rust
63 lines
2.4 KiB
Rust
// Verify debuginfo for generators:
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// - Each variant points to the file and line of its yield point
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// - The discriminants are marked artificial
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// - Other fields are not marked artificial
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//
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//
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// compile-flags: -C debuginfo=2 --edition=2018
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// ignore-msvc
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#![feature(generators, generator_trait)]
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use std::ops::Generator;
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fn generator_test() -> impl Generator<Yield = i32, Return = ()> {
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|| {
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yield 0;
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let s = String::from("foo");
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yield 1;
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}
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}
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// FIXME: No way to reliably check the filename.
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// CHECK-DAG: [[GEN_FN:!.*]] = !DINamespace(name: "generator_test"
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// CHECK-DAG: [[GEN:!.*]] = !DICompositeType(tag: DW_TAG_structure_type, name: "{generator#0}", scope: [[GEN_FN]]
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// CHECK: [[VARIANT:!.*]] = !DICompositeType(tag: DW_TAG_variant_part, scope: [[GEN_FN]],
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// CHECK-NOT: flags: DIFlagArtificial
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// CHECK-SAME: discriminator: [[DISC:![0-9]*]]
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// CHECK: {{!.*}} = !DIDerivedType(tag: DW_TAG_member, name: "0", scope: [[VARIANT]],
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// CHECK-SAME: file: [[FILE:![0-9]*]], line: 14,
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// CHECK-NOT: flags: DIFlagArtificial
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// CHECK-SAME: )
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// CHECK: {{!.*}} = !DICompositeType(tag: DW_TAG_structure_type, name: "Unresumed", scope: [[GEN]],
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// CHECK-NOT: flags: DIFlagArtificial
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// CHECK-SAME: )
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// CHECK: {{!.*}} = !DIDerivedType(tag: DW_TAG_member, name: "1", scope: [[VARIANT]],
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// CHECK-SAME: file: [[FILE]], line: 18,
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// CHECK-NOT: flags: DIFlagArtificial
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// CHECK-SAME: )
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// CHECK: {{!.*}} = !DIDerivedType(tag: DW_TAG_member, name: "2", scope: [[VARIANT]],
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// CHECK-SAME: file: [[FILE]], line: 18,
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// CHECK-NOT: flags: DIFlagArtificial
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// CHECK-SAME: )
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// CHECK: {{!.*}} = !DIDerivedType(tag: DW_TAG_member, name: "3", scope: [[VARIANT]],
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// CHECK-SAME: file: [[FILE]], line: 15,
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// CHECK-NOT: flags: DIFlagArtificial
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// CHECK-SAME: )
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// CHECK: {{!.*}} = !DIDerivedType(tag: DW_TAG_member, name: "4", scope: [[VARIANT]],
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// CHECK-SAME: file: [[FILE]], line: 17,
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// CHECK-NOT: flags: DIFlagArtificial
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// CHECK-SAME: )
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// CHECK: [[S1:!.*]] = !DICompositeType(tag: DW_TAG_structure_type, name: "Suspend1", scope: [[GEN]],
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// CHECK-NOT: flags: DIFlagArtificial
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// CHECK-SAME: )
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// CHECK: {{!.*}} = !DIDerivedType(tag: DW_TAG_member, name: "s", scope: [[S1]]
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// CHECK-NOT: flags: DIFlagArtificial
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// CHECK-SAME: )
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// CHECK: [[DISC]] = !DIDerivedType(tag: DW_TAG_member, name: "__state", scope: [[GEN_FN]],
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// CHECK-SAME: flags: DIFlagArtificial
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fn main() {
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let _dummy = generator_test();
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}
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