Binary format of attribute section is not specified

[Shadlock0133]

Documentation lists individual attributes, but doesn't specify overall format of the section.

For example, LLVM starts the section with "Format_Version" tag (0x41), followed by section length (as fixed-size 32-bit int (u32)), vendor string ("riscv"), "File" attribute type (0x01), content length (u32), then finally actual attributes; which doesn't seem to be documented anywhere.

[hehaoqian]

What is the type of the attribute tag?
Is it uleb128? But this is not in the document

[Shadlock0133]

Looks like attribute tag is an u8: https://github.com/llvm/llvm-project/blob/11c1d8b7fd82b32b37db47bcd8eac813b9667b5c/llvm/lib/Target/RISCV/MCTargetDesc/RISCVELFStreamer.cpp#L98

[hehaoqian]

Sorry, I mean the type of the tag in the key value pairs.
Look like it is ULEB128.
https://github.com/llvm/llvm-project/blob/11c1d8b7fd82b32b37db47bcd8eac813b9667b5c/llvm/lib/Target/RISCV/MCTargetDesc/RISCVELFStreamer.cpp#L126