Indexing of some assembly function in Zephyr doesn't work.

[miggazElquez]

Some assembly functions, used only in assembly code, are not indexed by elixir.

See this example:

https://elixir.bootlin.com/zephyr/v4.1.0/source/soc/wch/ch32v/qingke_v2a/soc_irq.S

__soc_handle_irq is used by a C file somewhere, so it is indexed properly, but __soc_is_irq is only used in this file, in assembly.

Additionally, even if it's not a big problem, __soc_handle_irq indicate that it is "referenced" in a lot of these assembly files, while they all redefines the function.

[tleb]

Yes, this isn't a surprise once you know how Elixir works.

• We don't run ctags on assembly files. Even if we did, we'd have issues.
• First, I don't know how good the support is. There are many different assembly syntaxes.
• Then, ctags cannot know what SECTION_FUNC() implies as its definition is in another file. We don't allow ctags to get context from other files as that would break one optimization: if a file does not change across releases, we don't need to re-index it.
• We could give it as argument an hardcoded SECTION_FUNC() (and others) definition, that'd be Zephyr-specific.

So currently, we never get definitions from assembly files, only references. That is why __soc_handle_irq is indexed in the .S file: it has a definition from somewhere else. The way we generate references is to take all tokens in a file that match a definition.

---

What is the way forward? Manage to index definitions from ASM files. That most probably will be super project-specific. That will fix both issues reported here:

• __soc_is_irq not indexed in ASM file,
• __soc_handle_irq indexed as ref instead of def in ASM file.