[llvm-dev] Metadata/DebugInfo in *.ll file

via llvm-dev llvm-dev at lists.llvm.org
Mon Jan 14 07:48:59 PST 2019

I believe the only thing you can add directly to an Instruction is the source location (via setDebugLoc, not setMetadata).
All other instruction-related debug info is currently conveyed by debug-info intrinsics, and the association is by one of the intrinsic operands being the Instruction.
Is this for a front-end? Typically front-ends only add dbg.declare intrinsics, which are attached to the alloca for the relevant variable.

From: llvm-dev [mailto:llvm-dev-bounces at lists.llvm.org] On Behalf Of Norbert Dajka via llvm-dev
Sent: Monday, January 14, 2019 9:26 AM
To: llvm-dev at lists.llvm.org
Subject: [llvm-dev] Metadata/DebugInfo in *.ll file

Hi list,

I found relevant documentation regarding DebugInfo creation in the LLVM IR bytecode. It can be done for compileunits, functions, and other constructs, with the help of DIBuilder class. However I can't save debug information related to individual llvm::Instructions. I tried DebugLoc, DILocation setting directly with setMetadata(). I tried other ways, for e.g.: insertDbgValueIntrinsic(). If I set invalid parameters for the call, then the LLVM passes warn me, correctly, so at least I see in the log, that LLVM tries to assign debuginfo to given instruction. If however I set valid parameters, then I suppose, that the passes drop the debuginfo related to an Instruction.
Do you know a surefire way to avoid the drop of instruction related debuginfo?

Thanks for your time,
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