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Bitcode: Use unsigned char to record MDStrings

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`MDString`s can have arbitrary characters in them.  Prevent an assertion
that fired in `BitcodeWriter` because of sign extension by copying the
characters into the record as `unsigned char`s.

Based on a patch by Keno Fischer; fixes PR21882.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224077 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan P. N. Exon Smith
2014-12-11 23:34:30 +00:00
parent 033d8ea7a9
commit 4bedb48751
4 changed files with 20 additions and 1 deletions
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9
test/Bitcode/mdstring-high-bits.ll Normal file
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; RUN: llvm-as < %s | llvm-dis | FileCheck %s
; PR21882: confirm we don't crash when high bits are set in a character in a
; metadata string.
; CHECK: !name = !{!0}
!name = !{!0}
; CHECK: !0 = metadata !{metadata !"\80"}
!0 = metadata !{metadata !"\80"}