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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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12
llvm/lib/Bitcode/Reader/MetadataLoader.cpp
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@@ -1873,13 +1873,18 @@ Error MetadataLoader::MetadataLoaderImpl::parseOneMetadata(
unsigned Version = Record[0] >> 1;
if (Version == 2) {
Metadata *Annotations = nullptr;
if (Record.size() > 12)
Annotations = getMDOrNull(Record[12]);
MetadataList.assignValue(
GET_OR_DISTINCT(
DIGlobalVariable,
(Context, getMDOrNull(Record[1]), getMDString(Record[2]),
getMDString(Record[3]), getMDOrNull(Record[4]), Record[5],
getDITypeRefOrNull(Record[6]), Record[7], Record[8],
getMDOrNull(Record[9]), getMDOrNull(Record[10]), Record[11])),
getMDOrNull(Record[9]), getMDOrNull(Record[10]), Record[11],
Annotations)),
NextMetadataNo);
NextMetadataNo++;
@@ -1892,7 +1897,8 @@ Error MetadataLoader::MetadataLoaderImpl::parseOneMetadata(
getMDString(Record[2]), getMDString(Record[3]),
getMDOrNull(Record[4]), Record[5],
getDITypeRefOrNull(Record[6]), Record[7], Record[8],
getMDOrNull(Record[10]), nullptr, Record[11])),
getMDOrNull(Record[10]), nullptr, Record[11],
nullptr)),
NextMetadataNo);
NextMetadataNo++;
@@ -1925,7 +1931,7 @@ Error MetadataLoader::MetadataLoaderImpl::parseOneMetadata(
(Context, getMDOrNull(Record[1]), getMDString(Record[2]),
getMDString(Record[3]), getMDOrNull(Record[4]), Record[5],
getDITypeRefOrNull(Record[6]), Record[7], Record[8],
getMDOrNull(Record[10]), nullptr, AlignInBits));
getMDOrNull(Record[10]), nullptr, AlignInBits, nullptr));
DIGlobalVariableExpression *DGVE = nullptr;
if (Attach || Expr)