{"record":{"id":"3d4a504fba9773c4","repo":"wasmerio/wasmer","slug":"write-offset-at-not-yet-implemented","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-cranelift/src/dwarf.rs","lineNumber":168,"sourceCode":"                Address::Symbol { .. } => {\n                    unimplemented!(\"eh pointer encoding {eh_pe:?} not supported for symbol targets\")\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":150,"sourceCodeEnd":171,"githubUrl":"https://github.com/wasmerio/wasmer/blob/8c4b9ee9d33fb2068863fbb3d328683e7e6ff7f5/lib/compiler-cranelift/src/dwarf.rs#L150-L171","documentation":"Stub implementation of gimli::Writer::write_offset_at for the cranelift DWARF writer: patching a section-relative offset at a given position is unimplemented and panics if any DWARF-emission path calls it.","triggerScenarios":"DWARF emission that back-patches a size/offset field at a fixed offset (e.g. writing unit lengths or updating ranges after the fact) while generating debug sections with cranelift.","commonSituations":"Full .debug_* section generation with the cranelift backend; debug-info tooling triggering back-patch paths.","solutions":["Avoid enabling DWARF debug-section generation with cranelift","Use the LLVM compiler backend for debug info","Update Wasmer for newer DWARF support","Implement write_offset_at in dwarf.rs if you maintain 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":"// Same gate: full DWARF emission requires a backend that implements write_offset_at\nlet backend = if requires_dwarf_backpatch { Backend::LLVM } else { Backend::Cranelift };","typeGuard":null,"tryCatchPattern":"// unimplemented!() panics are not catchable; avoid by selecting the LLVM backend for DWARF workloads","preventionTips":["Use LLVM for any DWARF-emitting workload","Do not enable debug-section generation with cranelift","Track upstream implementation status of write_offset_at","Isolate DWARF generation in a separate compile step with an appropriate backend"],"tags":["rust","cranelift","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"}