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BitcodeReader: Allow METADATA_STRINGS to only have !"" 

Support parsing a METADATA_STRINGS record that only has a single piece
of metadata, !"".  Fixes a corner case in r264551.

llvm-svn: 264699
This commit is contained in:
Duncan P. N. Exon Smith 2016-03-29 05:25:17 +00:00
parent 3acdfeee11
commit bb7ce3b850
2 changed files with 8 additions and 1 deletions
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2
llvm/lib/Bitcode/Reader/BitcodeReader.cpp
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@ -1899,7 +1899,7 @@ std::error_code BitcodeReader::parseMetadataStrings(ArrayRef<uint64_t> Record,
unsigned StringsOffset = Record[1];
if (!NumStrings)
return error("Invalid record: metadata strings with no strings");
if (StringsOffset >= Blob.size())
if (StringsOffset > Blob.size())
return error("Invalid record: metadata strings corrupt offset");
StringRef Lengths = Blob.slice(0, StringsOffset);

7
llvm/test/Bitcode/metadata-only-empty-string.ll Normal file
View File

@ -0,0 +1,7 @@
; RUN: llvm-as < %s | llvm-dis | FileCheck %s
; CHECK: !named = !{!0}
!named = !{!0}
; CHECK: !0 = !{!""}
!0 = !{!""}