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[DebugInfo] Add DIArgList MD to store multple values in DbgVariableIntrinsics

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This patch adds a new metadata node, DIArgList, which contains a list of SSA
values. This node is in many ways similar in function to the existing
ValueAsMetadata node, with the difference being that it tracks a list instead of
a single value. Internally, it uses ValueAsMetadata to track the individual
values, but there is also a reasonable amount of DIArgList-specific
value-tracking logic on top of that. Similar to ValueAsMetadata, it is a special
case in parsing and printing due to the fact that it requires a function state
(as it may reference function-local values).

This patch should not result in any immediate functional change; it allows for
DIArgLists to be parsed and printed, but debug variable intrinsics do not yet
recognize them as a valid argument (outside of parsing).

Differential Revision: https://reviews.llvm.org/D88175
This commit is contained in:
gbtozers
2020-09-30 16:29:53 +01:00
committed by Stephen Tozer
parent 5ac93b57f2
commit c52cf11f42
20 changed files with 371 additions and 15 deletions
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lib/Bitcode/Writer/BitcodeWriter.cpp
+13
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@@ -335,6 +335,8 @@ private:
unsigned Abbrev);
void writeDIMacroFile(const DIMacroFile *N, SmallVectorImpl<uint64_t> &Record,
unsigned Abbrev);
void writeDIArgList(const DIArgList *N, SmallVectorImpl<uint64_t> &Record,
unsigned Abbrev);
void writeDIModule(const DIModule *N, SmallVectorImpl<uint64_t> &Record,
unsigned Abbrev);
void writeDITemplateTypeParameter(const DITemplateTypeParameter *N,
@@ -1867,6 +1869,17 @@ void ModuleBitcodeWriter::writeDIMacroFile(const DIMacroFile *N,
Record.clear();
}
void ModuleBitcodeWriter::writeDIArgList(const DIArgList *N,
SmallVectorImpl<uint64_t> &Record,
unsigned Abbrev) {
Record.reserve(N->getArgs().size());
for (ValueAsMetadata *MD : N->getArgs())
Record.push_back(VE.getMetadataOrNullID(MD));
Stream.EmitRecord(bitc::METADATA_ARG_LIST, Record, Abbrev);
Record.clear();
}
void ModuleBitcodeWriter::writeDIModule(const DIModule *N,
SmallVectorImpl<uint64_t> &Record,
unsigned Abbrev) {