Dwarf Expert

Authoritative Sources

When specific DWARF standard information is needed, use these authoritative sources:

1. Official DWARF Standards (dwarfstd.org): Use web search to find specific sections of the official DWARF specification at dwarfstd.org. Search queries like "DWARF5 DW_TAG_subprogram attributes site:dwarfstd.org" are effective.

2. LLVM DWARF Implementation: The LLVM project's DWARF handling code at llvm/lib/DebugInfo/DWARF/ serves as a reliable reference implementation. Key files include:

   • DWARFDie.cpp - DIE handling and attribute access
   • DWARFUnit.cpp - Compilation unit parsing
   • DWARFDebugLine.cpp - Line number information
   • DWARFVerifier.cpp - Validation logic

3. libdwarf: The reference C implementation at github.com/davea42/libdwarf-code provides detailed handling of DWARF data structures.

Verification Workflows

Use llvm-dwarfdump verification options to validate DWARF data integrity:

Structural Validation

# Verify DWARF structure (compile units, DIE relationships, address ranges)
llvm-dwarfdump --verify <binary>

# Detailed error output with summary
llvm-dwarfdump --verify --error-display=full <binary>

# Machine-readable JSON error summary
llvm-dwarfdump --verify --verify-json=errors.json <binary>

Quality Metrics

# Output debug info quality metrics as JSON
llvm-dwarfdump --statistics <binary>

The --statistics output helps compare debug info quality across compiler versions and optimization levels.

Common Verification Patterns

• After compilation: Verify binaries have valid DWARF before distribution
• Comparing builds: Use --statistics to detect debug info quality regressions
• Debugging debuggers: Identify malformed DWARF causing debugger issues
• DWARF tool development: Validate parser output against known-good binaries

Parsing DWARF Debug Information

readelf

ELF files can be parsed via the readelf command ({baseDir}/reference/readelf.md). Use this for general ELF information, but prefer dwarfdump for DWARF-specific parsing.

dwarfdump

DWARF files can be parsed via the dwarfdump command, which is more effective at parsing and displaying complex DWARF information than readelf and should be used for most DWARF parsing tasks ({baseDir}/reference/dwarfdump.md).

Working With Code

This skill supports writing, modifying, and reviewing code that interacts with DWARF data. This may involve code that parses DWARF debug data from scratch or code that leverages libraries to parse and interact with DWARF data ({baseDir}/reference/coding.md).

Choosing Your Approach

┌─ Need to verify DWARF data integrity?
│   └─ Use `llvm-dwarfdump --verify` (see Verification Workflows above)
├─ Need to answer questions about the DWARF standard?
│   └─ Search dwarfstd.org or reference LLVM/libdwarf source
├─ Need simple section dump or general ELF info?
│   └─ Use `readelf` ({baseDir}/reference/readelf.md)
├─ Need to parse, search, and/or dump DWARF DIE nodes?
│   └─ Use `dwarfdump` ({baseDir}/reference/dwarfdump.md)
└─ Need to write, modify, or review code that interacts with DWARF data?
    └─ Refer to the coding reference ({baseDir}/reference/coding.md)

Limitations

• Use this skill only when the task clearly matches the scope described above.
• Do not treat the output as a substitute for environment-specific validation, testing, or expert review.
• Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are missing.