Get debug location from an instruction

[jiezhuzzz]

In LLVM, we can get the debug location directly from an instruction, e.g., const DebugLoc &location = instruction->getDebugLoc();.

In inkwell, however, there's no specific method like get_debug_location() on InstructionValue to retrieve the debug location that was set on an already-built instruction. Does anyone know whether I missed something? Or how can I get the debug information from an instruction? Thanks so much!

[ErisianArchitect]

I just took a look, and llvm-sys has LLVMInstructionGetDebugLoc, so I think it should be possible to add this to inkwell.

[jiezhuzzz]

Thanks for your reply! I’m happy to open a PR. I have one more question: In LLVM, the getDebugLoc function returns a DebugLoc class, which ultimately refers to a DILocation class. I expect the LLVMInstructionGetDebugLoc function to also return a DILocation struct. But I can only see it returns a LLVMMetadataRef struct. Is there some internal type conversion, or do I need to implement that? Thanks in advance.

[ErisianArchitect]

I may be wrong, but I'm pretty sure there's no safe wrapper for LLVMMetadataRef. It wouldn't be hard to do. I'd do the PR myself if I weren't waiting for one of my PRs to be merged.

[ErisianArchitect]

My recent PR got merged, so I'm going to take a look at this probably tomorrow.

[jiezhuzzz]

Thanks!

[ErisianArchitect]

It might take me a bit longer to get around to looking at this. I'm finishing up a side project right now, which should be done in the next few days, but I often underestimate how long things will take me, so give me at least a week to take a look at it. I'll keep you updated.

[ErisianArchitect]

I created an issue for this. You can check the status here: #621.