[all-commits] [llvm/llvm-project] 972800: [ObjectYAML][ELF] Add support for emitting the .de...

[Xing GUO via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 972800039566b10dec9c918a9dabc1f6a0619122
      https://github.com/llvm/llvm-project/commit/972800039566b10dec9c918a9dabc1f6a0619122
  Author: Xing GUO <higuoxing at gmail.com>
  Date:   2020-06-09 (Tue, 09 Jun 2020)

  Changed paths:
    M llvm/lib/ObjectYAML/DWARFYAML.cpp
    M llvm/lib/ObjectYAML/ELFEmitter.cpp
    A llvm/test/tools/yaml2obj/ELF/DWARF/debug-line.yaml

  Log Message:
  -----------
  [ObjectYAML][ELF] Add support for emitting the .debug_line section.

This patch enables yaml2elf emit the .debug_line section.

Test cases for emitting the dwarf64 .debug_line section and opcodes will be added later.

Known issues:
- We should replace `InitialLength` with `Format` and `Length`
- Currently implementation of the .debug_line section only fully supports DWARFv2, some header fields in DWARFv4 and DWARFv5 is missing, e.g., `header_length` in DWARFv4, `address_size` and `segment_selector_size` in DWARFv5.
- Some opcodes relies on the .debug_info section, we should warn user about it.

These issues will be addressed in a follow-up patch.

Reviewed By: jhenderson, grimar

Differential Revision: https://reviews.llvm.org/D81450