[PATCH] D52239: [OCaml] Add OCaml APIs to access DebugLoc info

[Josh Berdine via Phabricator via llvm-commits]

jberdine added a comment.

I have investigated trying to use LLVMGetMetadata instead of adding LLVMGetDebugLoc* functions, which is my understanding of @CodaFi's question. To summarize my (perhaps incorrect) understanding, on the one hand LLVMGetMetadata calls Instruction::getMetadata which returns Instruction::DbgLoc, a DILocation, cast to MDNode. On the other hand, LLVMGetDebugLocLine calls Instruction::getDebugLoc, a DILocation, and calls DILocation::getLine, which returns DILocation::SubclassData32. It does not seem possible to access that field using the MDNode api. To access such fields would seem to require exposing the class hierarchy below MDNode in LLVM-C. Does that align with your understanding?


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