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[Metadata] Extend 'count' field of DISubrange to take a metadata node

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Summary:
This patch extends the DISubrange 'count' field to take either a
(signed) constant integer value or a reference to a DILocalVariable
or DIGlobalVariable.

This is patch [1/3] in a series to extend LLVM's DISubrange Metadata
node to support debugging of C99 variable length arrays and vectors with
runtime length like the Scalable Vector Extension for AArch64. It is
also a first step towards representing more complex cases like arrays
in Fortran.

Reviewers: echristo, pcc, aprantl, dexonsmith, clayborg, kristof.beyls, dblaikie

Reviewed By: aprantl

Subscribers: rnk, probinson, fhahn, aemerson, rengolin, JDevlieghere, llvm-commits

Differential Revision: https://reviews.llvm.org/D41695

llvm-svn: 323313
This commit is contained in:
Sander de Smalen
2018-01-24 09:56:07 +00:00
parent e8404780c3
commit fdf40917d9
19 changed files with 370 additions and 34 deletions
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5
llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
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@@ -1442,8 +1442,9 @@ static uint64_t rotateSign(int64_t I) {
void ModuleBitcodeWriter::writeDISubrange(const DISubrange *N,
SmallVectorImpl<uint64_t> &Record,
unsigned Abbrev) {
Record.push_back(N->isDistinct());
Record.push_back(N->getCount());
const uint64_t Version = 1 << 1;
Record.push_back((uint64_t)N->isDistinct() | Version);
Record.push_back(VE.getMetadataOrNullID(N->getRawCountNode()));
Record.push_back(rotateSign(N->getLowerBound()));
Stream.EmitRecord(bitc::METADATA_SUBRANGE, Record, Abbrev);