{"record":{"id":"b10b5f78f8cfe265","repo":"wasmerio/wasmer","slug":"write-offset-at-not-yet-implemented-b10b5f","errorCode":null,"errorMessage":"write_offset_at not yet implemented","messagePattern":"write_offset_at not yet implemented","errorType":"panic","errorClass":null,"httpStatus":null,"severity":"error","filePath":"lib/compiler-singlepass/src/dwarf.rs","lineNumber":104,"sourceCode":"                } else {\n                    unreachable!(\"Symbol {} in DWARF not recognized\", symbol);\n                }\n            }\n        }\n    }\n\n    fn write_offset(&mut self, _val: usize, _section: SectionId, _size: u8) -> Result<()> {\n        unimplemented!(\"write_offset not yet implemented\");\n    }\n\n    fn write_offset_at(\n        &mut self,\n        _offset: usize,\n        _val: usize,\n        _section: SectionId,\n        _size: u8,\n    ) -> Result<()> {\n        unimplemented!(\"write_offset_at not yet implemented\");\n    }\n}\n","sourceCodeStart":86,"sourceCodeEnd":107,"githubUrl":"https://github.com/wasmerio/wasmer/blob/8c4b9ee9d33fb2068863fbb3d328683e7e6ff7f5/lib/compiler-singlepass/src/dwarf.rs#L86-L107","documentation":"Stub gimli::Writer::write_offset_at in the singlepass DWARF writer: back-patching a section-relative offset at a fixed position is unimplemented and panics if the DWARF machinery calls it.","triggerScenarios":"DWARF emission that patches an offset field in place (lengths, range tables) while generating debug sections with the singlepass backend.","commonSituations":"Full .debug_* generation with singlepass; debug tooling triggering back-patch paths.","solutions":["Avoid DWARF debug-section generation with singlepass","Use the LLVM backend for debug info","Update Wasmer for potential newer support","Implement write_offset_at in lib/compiler-singlepass/src/dwarf.rs in a fork"],"exampleFix":"// before\nfn write_offset_at(&mut self, _offset: usize, _val: usize, _section: SectionId, _size: u8) -> Result<()> {\n    unimplemented!(\"write_offset_at not yet implemented\");\n}\n// after\nfn write_offset_at(&mut self, offset: usize, val: usize, _section: SectionId, size: u8) -> Result<()> {\n    self.write_udata_at(offset, val, size); // or return a proper unsupported error\n    Ok(())\n}","handlingStrategy":"fallback","validationCode":"// DWARF back-patching requires a complete writer impl: use LLVM\nlet backend = if requires_dwarf_backpatch { Backend::LLVM } else { Backend::Singlepass };","typeGuard":null,"tryCatchPattern":"// unimplemented!() panics are not catchable; avoid by configuration (backend selection)","preventionTips":["Route any debug-info compilation to the LLVM backend","Keep singlepass usage to minimal unwind-info scenarios","Check upstream dwarf.rs for stub methods before enabling new debug features","Add an early config validation that rejects debug-info + singlepass combinations"],"tags":["rust","singlepass","dwarf","unimplemented"],"backgroundTag":"unimplemented-dwarf-relocation","analyzedSha":"8c4b9ee9d33fb2068863fbb3d328683e7e6ff7f5","analyzedAt":"2026-09-01T23:06:31.009Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-09T06:17:21.866Z"}