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The patch resolves the conflict between AddressSanitizer and load widening (GVN).

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The problem initially reported by Mozilla folks (http://code.google.com/p/address-sanitizer/issues/detail?id=20),
but it also prevents us from enabling LLVM bootstrap with AddressSanitizer.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149925 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Kostya Serebryany
2012-02-06 22:48:56 +00:00
parent 44ebf8b033
commit 0ca032b03d
2 changed files with 51 additions and 0 deletions
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lib/Analysis/MemoryDependenceAnalysis.cpp
+8
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@@ -323,6 +323,14 @@ getLoadLoadClobberFullWidthSize(const Value *MemLocBase, int64_t MemLocOffs,
!TD.fitsInLegalInteger(NewLoadByteSize*8))
return 0;
if (LIOffs+NewLoadByteSize > MemLocEnd &&
LI->getParent()->getParent()->hasFnAttr(Attribute::AddressSafety)) {
// We will be reading past the location accessed by the original program.
// While this is safe in a regular build, Address Safety analysis tools
// may start reporting false warnings. So, don't do widening.
return 0;
}
// If a load of this width would include all of MemLoc, then we succeed.
if (LIOffs+NewLoadByteSize >= MemLocEnd)
return NewLoadByteSize;