| Issue |
166441
|
| Summary |
yaml2obj lacks dwarf5 .debug_line support
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
rjmansfield
|
yaml2obj does not support DWARF5's structured directory and file table format in `.debug_line` sections. It appears to only support dwarf4 format with simple string arrays.
For example, in `llvm/include/llvm/ObjectYAML/DWARFYAML.h`
```cpp
struct LineTable {
dwarf::DwarfFormat Format;
std::optional<uint64_t> Length;
uint16_t Version;
std::optional<uint64_t> PrologueLength;
uint8_t MinInstLength;
uint8_t MaxOpsPerInst;
uint8_t DefaultIsStmt;
uint8_t LineBase;
uint8_t LineRange;
std::optional<uint8_t> OpcodeBase;
std::optional<std::vector<uint8_t>> StandardOpcodeLengths;
std::vector<StringRef> IncludeDirs; // DWARF4: simple strings
std::vector<File> Files; // DWARF4: simple file entries
std::vector<LineTableOpcode> Opcodes;
};
```
When attempting to write yaml for dwarf5 debug_line
```yaml
--- !ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_EXEC
DWARF:
debug_line:
- Version: 5
AddressSize: 8
SegSelectorSize: 0
MinInstLength: 1
MaxOpsPerInst: 1
DefaultIsStmt: 1
LineBase: 251
LineRange: 14
OpcodeBase: 13
StandardOpcodeLengths: [ 0, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 1 ]
IncludeDirs:
- '/usr/include'
Files:
- Name: 'test.c'
DirIdx: 0
...
```
```
YAML:21:11: error: missing required key 'ModTime'
- Name: 'test.c'
^
yaml2obj: error: failed to parse YAML input: Invalid argument
```
It looks like all of the existing dwarf5 .debug_line tests work around this by doing `Sections:` with raw hex `Content:`
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