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[DebugInfo] generate btf_tag annotations for DIComposite types

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Clang patch D106614 added attribute btf_tag support. This patch
generates btf_tag annotations for DIComposite types.
A field "annotations" is introduced to DIComposite, and the
annotations are represented as an DINodeArray, similar to
DIComposite elements. The following example illustrates
how annotations are encoded in IR:
  distinct !DICompositeType(..., annotations: !10)
  !10 = !{!11, !12}
  !11 = !{!"btf_tag", !"a"}
  !12 = !{!"btf_tag", !"b"}
Each btf_tag annotation is represented as a 2D array of
meta strings. Each record may have more than one
btf_tag annotations, as in the above example.

Differential Revision: https://reviews.llvm.org/D106615
This commit is contained in:
Yonghong Song
2021-07-18 23:43:48 -07:00
parent fd0557dbf1
commit 2fded193e7
10 changed files with 102 additions and 43 deletions
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llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
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@@ -1714,6 +1714,7 @@ void ModuleBitcodeWriter::writeDICompositeType(
Record.push_back(VE.getMetadataOrNullID(N->getRawAssociated()));
Record.push_back(VE.getMetadataOrNullID(N->getRawAllocated()));
Record.push_back(VE.getMetadataOrNullID(N->getRawRank()));
Record.push_back(VE.getMetadataOrNullID(N->getAnnotations().get()));
Stream.EmitRecord(bitc::METADATA_COMPOSITE_TYPE, Record, Abbrev);
Record.clear();