fix(debuginfo): Prefer DWARF names for Dart functions #293
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mitsuhiko
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Nov 26, 2020
jan-auer
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Nov 26, 2020
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| // Trust the symbol table more to contain accurate mangled names. However, since Dart's name | ||
| // mangling is lossy, we need to load the demangled name instead. | ||
| let prefer_dwarf_names = producer.as_deref() == Some(b"Dart VM"); |
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This is part 1 of the change: Detecting the Dart producer.
| .map(|n| Name::new(n, NameMangling::Mangled, self.language)) | ||
| }) | ||
| } else { | ||
| let symbol_name = if self.prefer_dwarf_names || inline { |
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This is part 2 of the change: Skipping symbol table lookup if DWARF names are preferred.
jan-auer
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* master: fix(debuginfo): Prefer DWARF names for Dart functions (#293)
jan-auer
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* master: (21 commits) fix: New nightly clippy lint (#295) fix(release): Do not publish examples to crates.io release: 8.0.0 ref(debuginfo): Remove re-exports of error types (#300) meta: Update changelog ref(debuginfo): Switch to error with kind (#299) ref(minidump): Switch to error with kind (#298) ref(unreal): Switch to error with kind (#297) ref(symcache): Switch to error with kind (#296) feat: Rename architecture to wasm32 (#294) fix(debuginfo): Prefer DWARF names for Dart functions (#293) fix: clippy (#292) hack(dwarf): Skip line program sequences at 0 (#291) feat(wasm): support for wasm (#166) ci: Run rust nighlty on a schedule (#289) ref: Updates for rust 1.48 (#288) fix(debuginfo): Update dmsort to 1.0.1 to avoid panic due to UB (#287) ci: Use GHA instead of zeus (#286) ref: Introduce explicit NameMangling and better DemangleOptions (#275) meta: Bump all semver-major dependencies (#283) ...
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We generally trust the symbol table to contain more accurate names than DW_AT_name and other attributes on DIEs in DWARF debug information. Some C++ compilers have been known to output truncated or simplified names into these attributes, whereas the symbol table always contains accurately mangled names.
The Dart compiler is an exception to this case. Its name mangling appears to be lossy and there is no generally available demangler. Thus, we need to prefer the demangled DW_AT_name.
Example:
Precompiled__pM_658260265_sEa__anonymous_closure__8632_MyAppState.build.<anonymous closure>Obtained via
cargo run -p addr2line -- -fCi -e app.symbols 0x211b7cfrom this example.Before:
After:
