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| author | Vedant Kumar <vsk@apple.com> | 2018-09-20 18:59:33 +0000 |
|---|---|---|
| committer | Vedant Kumar <vsk@apple.com> | 2018-09-20 18:59:33 +0000 |
| commit | 386ad01c7b6d83beb95267116af295471e36d426 (patch) | |
| tree | 8f3bbf44fccf2a9aa4fe9e3591834c69aeedd77e /llvm/lib/Bitcode | |
| parent | cc06a782baa9fcabc5e10b42e23e06d6018cc429 (diff) | |
| download | bcm5719-llvm-386ad01c7b6d83beb95267116af295471e36d426.tar.gz bcm5719-llvm-386ad01c7b6d83beb95267116af295471e36d426.zip | |
[Bitcode] Address backwards compat bug in r342631
r342631 expanded bitc::METADATA_LOCATION by one element. The bitcode
metadata loader was changed in a backwards-incompatible way, leading to
crashes when disassembling old bitcode:
assertion: empty() && "PlaceholderQueue hasn't been flushed before being destroyed"
Assertion failed: (empty() && "PlaceholderQueue hasn't been flushed before being destroyed")
This commit teaches the metadata loader to assume that the newly-added
IsImplicitCode bit is 'false' when not present in old bitcode. I've added a
bitcode compat regression test.
rdar://44645820
llvm-svn: 342678
Diffstat (limited to 'llvm/lib/Bitcode')
| -rw-r--r-- | llvm/lib/Bitcode/Reader/MetadataLoader.cpp | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/llvm/lib/Bitcode/Reader/MetadataLoader.cpp b/llvm/lib/Bitcode/Reader/MetadataLoader.cpp index 1af17f485e1..3fe7d220563 100644 --- a/llvm/lib/Bitcode/Reader/MetadataLoader.cpp +++ b/llvm/lib/Bitcode/Reader/MetadataLoader.cpp @@ -1139,7 +1139,7 @@ Error MetadataLoader::MetadataLoaderImpl::parseOneMetadata( break; } case bitc::METADATA_LOCATION: { - if (Record.size() != 6) + if (Record.size() != 5 && Record.size() != 6) return error("Invalid record"); IsDistinct = Record[0]; @@ -1147,7 +1147,7 @@ Error MetadataLoader::MetadataLoaderImpl::parseOneMetadata( unsigned Column = Record[2]; Metadata *Scope = getMD(Record[3]); Metadata *InlinedAt = getMDOrNull(Record[4]); - bool ImplicitCode = Record[5]; + bool ImplicitCode = Record.size() == 6 && Record[5]; MetadataList.assignValue( GET_OR_DISTINCT(DILocation, (Context, Line, Column, Scope, InlinedAt, ImplicitCode)), |
