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

that memset returns its argument!!

llvm-svn: 9811
This commit is contained in:
Chris Lattner 2003-11-08 21:55:50 +00:00
parent c129e009eb
commit 12dd38aa99
2 changed files with 17 additions and 4 deletions
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3
llvm/lib/Analysis/DataStructure/DSCallSiteIterator.h
View File

@ -39,8 +39,7 @@ struct DSCallSiteIterator {
return F->getName() == "printf" || F->getName() == "sscanf" ||
F->getName() == "fprintf" || F->getName() == "open" ||
F->getName() == "sprintf" || F->getName() == "fputs" ||
F->getName() == "fscanf" || F->getName() == "bzero" ||
F->getName() == "memset";
F->getName() == "fscanf";
}
// isUnresolvableFunction - Return true if this is an unresolvable

18
llvm/lib/Analysis/DataStructure/Local.cpp
View File

@ -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;
}