[Analysis][AIX] Add !implicit.ref globals as ThinLTO summary ref edges to support pragma comment(copyright) LTO interaction#199398
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[Analysis][AIX] Add !implicit.ref globals as ThinLTO summary ref edges to support pragma comment(copyright) LTO interaction#199398tonykuttai wants to merge 5 commits into
tonykuttai wants to merge 5 commits into
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- Emit !aix.copyright.comment from Clang for the pragma. - Lower it in LLVM to a TU-local string + llvm.used + !implicit.ref. - Add module-import and backend relocation tests.
Co-authored-by: Hubert Tong <hubert.reinterpretcast@gmail.com>
…imeComment() to the end of the class.
…s to support pragma comment(copyright) LTO interaction Teach ModuleSummaryAnalysis to include globals referenced via !implicit.ref metadata as explicit reference edges in the ThinLTO module summary via a new helper findImplicitRefEdges.
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Note: This PR adds LTO support for the pragma comment copyright feature implemented in #178184. Should be reviewed/merged after #178184.
LowerCommentStringPassimplements#pragma comment(copyright, ...)on AIX by creating a TU-local@__loadtime_comment_strglobal in the__loadtime_commentsection and attaching!implicit.refmetadata to alldefined functions. The PowerPC backend reads
!implicit.refand emits.refdirectives from each function csect to the copyright string csect, so the AIX XCOFF linker keeps the copyright string alive whenever any function from the TU is live.This change teaches
ModuleSummaryAnalysisto include globals referenced via!implicit.refmetadata as explicit reference edges in the ThinLTO module summary via a new helperfindImplicitRefEdges.