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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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7
include/llvm/ADT/StringRef.h
View File

@ -91,6 +91,13 @@ namespace llvm {
iterator end() const { return Data + Length; }
const unsigned char *bytes_begin() const {
return reinterpret_cast<const unsigned char *>(begin());
}
const unsigned char *bytes_end() const {
return reinterpret_cast<const unsigned char *>(end());
}
/// @}
/// @name String Operations
/// @{

3
include/llvm/IR/Metadata.h
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@ -459,6 +459,9 @@ public:
/// \brief Pointer to one byte past the end of the string.
iterator end() const { return getString().end(); }
const unsigned char *bytes_begin() const { return getString().bytes_begin(); }
const unsigned char *bytes_end() const { return getString().bytes_end(); }
/// \brief Methods for support type inquiry through isa, cast, and dyn_cast.
static bool classof(const Metadata *MD) {
return MD->getMetadataID() == MDStringKind;

2
lib/Bitcode/Writer/BitcodeWriter.cpp
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@ -800,7 +800,7 @@ static void WriteModuleMetadata(const Module *M,
}
// Code: [strchar x N]
Record.append(MDS->begin(), MDS->end());
Record.append(MDS->bytes_begin(), MDS->bytes_end());
// Emit the finished record.
Stream.EmitRecord(bitc::METADATA_STRING, Record, MDSAbbrev);

9
test/Bitcode/mdstring-high-bits.ll Normal file
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@ -0,0 +1,9 @@
; 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"}