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Fix more undefined behavior

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17356 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-10-30 04:22:45 +00:00
parent 6f96774fc4
commit 62c3a95051
1 changed files with 13 additions and 10 deletions
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23
lib/Analysis/DataStructure/Local.cpp
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@ -213,7 +213,7 @@ DSNodeHandle GraphBuilder::getValueDest(Value &Val) {
return 0; // Null doesn't point to anything, don't add to ScalarMap!
DSNodeHandle &NH = ScalarMap[V];
if (NH.getNode())
if (!NH.isNull())
return NH; // Already have a node? Just return it...
// Otherwise we need to create a new node to point to.
@ -237,7 +237,7 @@ DSNodeHandle GraphBuilder::getValueDest(Value &Val) {
// This returns a conservative unknown node for any unhandled ConstExpr
return NH = createNode()->setUnknownNodeMarker();
}
if (NH.getNode() == 0) { // (getelementptr null, X) returns null
if (NH.isNull()) { // (getelementptr null, X) returns null
ScalarMap.erase(V);
return 0;
}
@ -272,7 +272,7 @@ DSNodeHandle GraphBuilder::getValueDest(Value &Val) {
DSNodeHandle &GraphBuilder::getLink(const DSNodeHandle &node, unsigned LinkNo) {
DSNodeHandle &Node = const_cast<DSNodeHandle&>(node);
DSNodeHandle &Link = Node.getLink(LinkNo);
if (!Link.getNode()) {
if (Link.isNull()) {
// If the link hasn't been created yet, make and return a new shadow node
Link = createNode();
}
@ -318,7 +318,7 @@ void GraphBuilder::visitPHINode(PHINode &PN) {
void GraphBuilder::visitGetElementPtrInst(User &GEP) {
DSNodeHandle Value = getValueDest(*GEP.getOperand(0));
if (Value.getNode() == 0) return;
if (Value.isNull()) return;
// As a special case, if all of the index operands of GEP are constant zeros,
// handle this just like we handle casts (ie, don't do much).
@ -472,8 +472,9 @@ void GraphBuilder::visitVAArgInst(VAArgInst &I) {
// Make that the node is read from.
Ptr.getNode()->setReadMarker();
// Ensure a typerecord exists...
Ptr.getNode()->mergeTypeInfo(I.getType(), Ptr.getOffset(), false);
// Ensure a type record exists.
DSNode *PtrN = Ptr.getNode();
PtrN->mergeTypeInfo(I.getType(), Ptr.getOffset(), false);
if (isPointerType(I.getType()))
setDestTo(I, getLink(Ptr));
@ -979,8 +980,8 @@ void GraphBuilder::visitInstruction(Instruction &Inst) {
if (isPointerType((*I)->getType()))
CurNode.mergeWith(getValueDest(**I));
if (CurNode.getNode())
CurNode.getNode()->setUnknownNodeMarker();
if (DSNode *N = CurNode.getNode())
N->setUnknownNodeMarker();
}
@ -993,7 +994,8 @@ void GraphBuilder::visitInstruction(Instruction &Inst) {
// pointed to by NH.
void GraphBuilder::MergeConstantInitIntoNode(DSNodeHandle &NH, Constant *C) {
// Ensure a type-record exists...
NH.getNode()->mergeTypeInfo(C->getType(), NH.getOffset());
DSNode *NHN = NH.getNode();
NHN->mergeTypeInfo(C->getType(), NH.getOffset());
if (C->getType()->isFirstClassType()) {
if (isPointerType(C->getType()))
@ -1011,7 +1013,8 @@ void GraphBuilder::MergeConstantInitIntoNode(DSNodeHandle &NH, Constant *C) {
} else if (ConstantStruct *CS = dyn_cast<ConstantStruct>(C)) {
const StructLayout *SL = TD.getStructLayout(CS->getType());
for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
DSNodeHandle NewNH(NH.getNode(), NH.getOffset()+SL->MemberOffsets[i]);
DSNode *NHN = NH.getNode();
DSNodeHandle NewNH(NHN, NH.getOffset()+SL->MemberOffsets[i]);
MergeConstantInitIntoNode(NewNH, cast<Constant>(CS->getOperand(i)));
}
} else if (isa<ConstantAggregateZero>(C) || isa<UndefValue>(C)) {