Hardware-assisted AddressSanitizer (llvm part).

Summary:
This is LLVM instrumentation for the new HWASan tool. It is basically
a stripped down copy of ASan at this point, w/o stack or global
support. Instrumenation adds a global constructor + runtime callbacks
for every load and store.

HWASan comes with its own IR attribute.

A brief design document can be found in
clang/docs/HardwareAssistedAddressSanitizerDesign.rst (submitted earlier).

Reviewers: kcc, pcc, alekseyshl

Subscribers: srhines, mehdi_amini, mgorny, javed.absar, eraman, llvm-commits, hiraditya

Differential Revision: https://reviews.llvm.org/D40932

llvm-svn: 320217

1 files changed, 4 insertions, 2 deletions

diff --git a/llvm/lib/Analysis/MemoryDependenceAnalysis.cpp b/llvm/lib/Analysis/MemoryDependenceAnalysis.cpp
index cb0c6a5..a6c5901 100644
--- a/llvm/lib/Analysis/MemoryDependenceAnalysis.cpp
+++ b/llvm/lib/Analysis/MemoryDependenceAnalysis.cpp
@@ -306,8 +306,10 @@ unsigned MemoryDependenceResults::getLoadLoadClobberFullWidthSize(
       return 0;
 
     if (LIOffs + NewLoadByteSize > MemLocEnd &&
-        LI->getParent()->getParent()->hasFnAttribute(
-            Attribute::SanitizeAddress))
+        (LI->getParent()->getParent()->hasFnAttribute(
+             Attribute::SanitizeAddress) ||
+         LI->getParent()->getParent()->hasFnAttribute(
+             Attribute::SanitizeHWAddress)))
       // 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.