[PATCH] D140900: [DebugInfo] Print empty MDTuples wrapped in MetadataAsValue inline
Orlando Cazalet-Hyams via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Tue Jan 3 09:03:41 PST 2023
Orlando created this revision.
Orlando added reviewers: StephenTozer, jmorse, djtodoro, jryans, scott.linder.
Orlando added a project: debug-info.
Herald added a subscriber: hiraditya.
Herald added a project: All.
Orlando requested review of this revision.
Herald added a project: LLVM.
Herald added a subscriber: llvm-commits.
This improves the readability of debugging intrinsics. Instead of:
call void @llvm.dbg.value(metadata !2, ...)
!2 = !{}
We will see:
call void @llvm.dbg.value(metadata !{}, ...)
!2 = !{}
Note that we still get a numbered metadata entry for the node even if it's not
used elsewhere. This is to avoid adding more context to the print functions.
This is already legal IR - LLVM can parse and understand it - so there is no
need to update the parser.
The next patches in this stack will make such empty metadata operands more
common and semantically important.
Related to https://discourse.llvm.org/t/auto-undef-debug-uses-of-a-deleted-value
https://reviews.llvm.org/D140900
Files:
llvm/lib/IR/AsmWriter.cpp
llvm/test/DebugInfo/Generic/empty-metadata-roundtrip.ll
llvm/test/Transforms/GlobalOpt/localize-constexpr-debuginfo.ll
llvm/test/Transforms/GlobalOpt/metadata.ll
llvm/test/Transforms/LoopIdiom/debug-line.ll
llvm/unittests/IR/MetadataTest.cpp
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