Handle bzero and memset in the local analysis, because we were missing the fact

that memset returns its argument!!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9811 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 16 insertions, 2 deletions

diff --git a/lib/Analysis/DataStructure/Local.cpp b/lib/Analysis/DataStructure/Local.cpp
index 689373ee7d..f3406b7699 100644
--- a/lib/Analysis/DataStructure/Local.cpp
+++ b/lib/Analysis/DataStructure/Local.cpp
@@ -435,8 +435,22 @@ void GraphBuilder::visitCallSite(CallSite CS) {
       } else if (F->getName() == "realloc") {
         DSNodeHandle RetNH = getValueDest(*CS.getInstruction());
         RetNH.mergeWith(getValueDest(**CS.arg_begin()));
-        DSNode *N = RetNH.getNode();
-        if (N) N->setHeapNodeMarker()->setModifiedMarker()->setReadMarker();
+        if (DSNode *N = RetNH.getNode())
+          N->setHeapNodeMarker()->setModifiedMarker()->setReadMarker();
+        return;
+      } else if (F->getName() == "memset") {
+        // Merge the first argument with the return value, and mark the memory
+        // modified.
+        DSNodeHandle RetNH = getValueDest(*CS.getInstruction());
+        RetNH.mergeWith(getValueDest(**CS.arg_begin()));
+        if (DSNode *N = RetNH.getNode())
+          N->setModifiedMarker();
+        return;
+      } else if (F->getName() == "bzero") {
+        // Mark the memory modified.
+        DSNodeHandle H = getValueDest(**CS.arg_begin());
+        if (DSNode *N = H.getNode())
+          N->setModifiedMarker();
         return;
       }