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Bitcode: Correctly handle Fixed and VBR arrays in BitstreamCursor::skipRecord().

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The assertions were wrong; we need to call getEncodingData() on the element,
not the array. While here, simplify the skipRecord() implementation for Fixed
and Char6 arrays. This is tested by the code I added to llvm-bcanalyzer
which makes sure that we can skip any record.

Differential Revision: https://reviews.llvm.org/D27241

llvm-svn: 288315
This commit is contained in:
Peter Collingbourne
2016-12-01 05:47:58 +00:00
parent 2eed75926c
commit cf2750a501
2 changed files with 10 additions and 8 deletions
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10
llvm/lib/Bitcode/Reader/BitstreamReader.cpp
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@@ -131,18 +131,16 @@ void BitstreamCursor::skipRecord(unsigned AbbrevID) {
default:
report_fatal_error("Array element type can't be an Array or a Blob");
case BitCodeAbbrevOp::Fixed:
assert((unsigned)Op.getEncodingData() <= MaxChunkSize);
for (; NumElts; --NumElts)
Read((unsigned)EltEnc.getEncodingData());
assert((unsigned)EltEnc.getEncodingData() <= MaxChunkSize);
JumpToBit(GetCurrentBitNo() + NumElts * EltEnc.getEncodingData());
break;
case BitCodeAbbrevOp::VBR:
assert((unsigned)Op.getEncodingData() <= MaxChunkSize);
assert((unsigned)EltEnc.getEncodingData() <= MaxChunkSize);
for (; NumElts; --NumElts)
ReadVBR64((unsigned)EltEnc.getEncodingData());
break;
case BitCodeAbbrevOp::Char6:
for (; NumElts; --NumElts)
Read(6);
JumpToBit(GetCurrentBitNo() + NumElts * 6);
break;
}
continue;