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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;