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[msan] Fix handling of byval arguments with large alignment.

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MSan param-tls slots are 8-byte aligned. This change clips
alignment of memcpy into param-tls to 8.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220101 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evgeniy Stepanov
2014-10-17 23:29:44 +00:00
parent 185a992dcf
commit c83c81a62e
2 changed files with 22 additions and 1 deletions
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3
lib/Transforms/Instrumentation/MemorySanitizer.cpp
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@ -2329,7 +2329,8 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
assert(A->getType()->isPointerTy() &&
"ByVal argument is not a pointer!");
Size = MS.DL->getTypeAllocSize(A->getType()->getPointerElementType());
unsigned Alignment = CS.getParamAlignment(i + 1);
unsigned ParamAlignment = CS.getParamAlignment(i + 1);
unsigned Alignment = std::min(ParamAlignment, kShadowTLSAlignment);
Store = IRB.CreateMemCpy(ArgShadowBase,
getShadowPtr(A, Type::getInt8Ty(*MS.C), IRB),
Size, Alignment);