[llvm] r255680 - Initialize all bytes in vp data (msan error)

[Xinliang David Li via llvm-commits]

Author: davidxl
Date: Tue Dec 15 15:57:08 2015
New Revision: 255680

URL: http://llvm.org/viewvc/llvm-project?rev=255680&view=rev
Log:
Initialize all bytes in vp data (msan error)

Modified:
    llvm/trunk/lib/ProfileData/InstrProf.cpp

Modified: llvm/trunk/lib/ProfileData/InstrProf.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/ProfileData/InstrProf.cpp?rev=255680&r1=255679&r2=255680&view=diff
==============================================================================
--- llvm/trunk/lib/ProfileData/InstrProf.cpp (original)
+++ llvm/trunk/lib/ProfileData/InstrProf.cpp Tue Dec 15 15:57:08 2015
@@ -211,8 +211,10 @@ uint64_t stringToHash(uint32_t ValueKind
 }
 
 ValueProfData *allocValueProfDataInstrProf(size_t TotalSizeInBytes) {
-  return (ValueProfData *)(new (::operator new(TotalSizeInBytes))
-                               ValueProfData());
+  ValueProfData *VD =
+      (ValueProfData *)(new (::operator new(TotalSizeInBytes)) ValueProfData());
+  memset(VD, 0, TotalSizeInBytes);
+  return VD;
 }
 
 static ValueProfRecordClosure InstrProfRecordClosure = {
@@ -223,8 +225,7 @@ static ValueProfRecordClosure InstrProfR
     getNumValueDataForSiteInstrProf,
     stringToHash,
     getValueForSiteInstrProf,
-    allocValueProfDataInstrProf
-};
+    allocValueProfDataInstrProf};
 
 // Wrapper implementation using the closure mechanism.
 uint32_t ValueProfData::getSize(const InstrProfRecord &Record) {