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[DebugInfo] generate btf_tag annotations for DIGlobalVariable

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Generate btf_tag annotations for DIGlobalVariable.
A field "annotations" is introduced to DIGlobalVariable, and
annotations are represented as an DINodeArray, similar to
DIComposite elements. The following example illustrates how
annotations are encoded in IR:
    distinct !DIGlobalVariable(..., annotations: !10)
    !10 = !{!11, !12}
    !11 = !{!"btf_tag", !"a"}
    !12 = !{!"btf_tag", !"b"}

Differential Revision: https://reviews.llvm.org/D106619
This commit is contained in:
Yonghong Song
2021-07-19 09:33:55 -07:00
parent be19aee4b2
commit 30c288489a
11 changed files with 111 additions and 41 deletions
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llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
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@@ -1962,6 +1962,7 @@ void ModuleBitcodeWriter::writeDIGlobalVariable(
Record.push_back(VE.getMetadataOrNullID(N->getStaticDataMemberDeclaration()));
Record.push_back(VE.getMetadataOrNullID(N->getTemplateParams()));
Record.push_back(N->getAlignInBits());
Record.push_back(VE.getMetadataOrNullID(N->getAnnotations().get()));
Stream.EmitRecord(bitc::METADATA_GLOBAL_VAR, Record, Abbrev);
Record.clear();