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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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10
llvm/lib/Bitcode/Reader/MetadataLoader.cpp
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@@ -1461,7 +1461,7 @@ Error MetadataLoader::MetadataLoaderImpl::parseOneMetadata(
break;
}
case bitc::METADATA_COMPOSITE_TYPE: {
if (Record.size() < 16 || Record.size() > 21)
if (Record.size() < 16 || Record.size() > 22)
return error("Invalid record");
// If we have a UUID and this is not a forward declaration, lookup the
@@ -1489,6 +1489,7 @@ Error MetadataLoader::MetadataLoaderImpl::parseOneMetadata(
Metadata *Associated = nullptr;
Metadata *Allocated = nullptr;
Metadata *Rank = nullptr;
Metadata *Annotations = nullptr;
auto *Identifier = getMDString(Record[15]);
// If this module is being parsed so that it can be ThinLTO imported
// into another module, composite types only need to be imported
@@ -1520,6 +1521,9 @@ Error MetadataLoader::MetadataLoaderImpl::parseOneMetadata(
if (Record.size() > 20) {
Rank = getMDOrNull(Record[20]);
}
if (Record.size() > 21) {
Annotations = getMDOrNull(Record[21]);
}
}
DICompositeType *CT = nullptr;
if (Identifier)
@@ -1527,7 +1531,7 @@ Error MetadataLoader::MetadataLoaderImpl::parseOneMetadata(
Context, *Identifier, Tag, Name, File, Line, Scope, BaseType,
SizeInBits, AlignInBits, OffsetInBits, Flags, Elements, RuntimeLang,
VTableHolder, TemplateParams, Discriminator, DataLocation, Associated,
Allocated, Rank);
Allocated, Rank, Annotations);
// Create a node if we didn't get a lazy ODR type.
if (!CT)
@@ -1536,7 +1540,7 @@ Error MetadataLoader::MetadataLoaderImpl::parseOneMetadata(
SizeInBits, AlignInBits, OffsetInBits, Flags,
Elements, RuntimeLang, VTableHolder, TemplateParams,
Identifier, Discriminator, DataLocation, Associated,
Allocated, Rank));
Allocated, Rank, Annotations));
if (!IsNotUsedInTypeRef && Identifier)
MetadataList.addTypeRef(*Identifier, *cast<DICompositeType>(CT));