LatticeValue *SFVInstVisitor::getLatticeValueForField(Value *Ptr) {
if (!isa<PointerType>(Ptr->getType()) ||
isa<ConstantPointerNull>(Ptr)) return 0;
const DSNodeHandle *NH = &DSG.getNodeForValue(Ptr);
DSNode *Node = NH->getNode();
assert(Node && "Pointer doesn't have node??");
std::multimap<DSNode*, LatticeValue*>::iterator I = NodeLVs.find(Node);
if (I == NodeLVs.end()) return 0; // Not a node we are still tracking.
// Okay, next convert the node offset to a field index expression.
std::vector<unsigned> Idxs;
ComputeStructureFieldIndices(Node->getType(), NH->getOffset(), Idxs,
Node->getParentGraph()->getTargetData());
for (; I != NodeLVs.end() && I->first == Node; ++I)
if (I->second->getIndices() == Idxs)
return I->second;
return 0;
}
// Precondition: Enforce that the alloca nodes haven't been already converted
void ConvertUnsafeAllocas::TransformAllocasToMallocs(std::list<DSNode *>
& unsafeAllocaNodes) {
std::list<DSNode *>::const_iterator iCurrent = unsafeAllocaNodes.begin(),
iEnd = unsafeAllocaNodes.end();
for (; iCurrent != iEnd; ++iCurrent) {
DSNode *DSN = *iCurrent;
// Now change the alloca instruction corresponding to the node
// to malloc
DSGraph *DSG = DSN->getParentGraph();
DSGraph::ScalarMapTy &SM = DSG->getScalarMap();
#ifndef LLVA_KERNEL
Instruction *MI = 0;
#else
Value *MI = 0;
#endif
for (DSGraph::ScalarMapTy::iterator SMI = SM.begin(), SME = SM.end();
SMI != SME; ) {
bool stackAllocate = true;
// If this is already a heap node, then you cannot allocate this on the
// stack
if (DSN->isHeapNode()) {
stackAllocate = false;
}
if (SMI->second.getNode() == DSN) {
if (AllocaInst *AI = dyn_cast<AllocaInst>((Value *)(SMI->first))) {
//
// Create a new heap allocation instruction.
//
if (AI->getParent() != 0) {
//
// Create an LLVM value representing the size of the allocation.
// If it's an array allocation, we'll need to insert a
// multiplication instruction to get the size times the number of
// elements.
//
unsigned long size = TD->getTypeAllocSize(AI->getAllocatedType());
Value *AllocSize = ConstantInt::get(Int32Type, size);
if (AI->isArrayAllocation())
AllocSize = BinaryOperator::Create(Instruction::Mul, AllocSize,
AI->getOperand(0), "sizetmp",
AI);
std::vector<Value *> args(1, AllocSize);
CallInst *CI = CallInst::Create (kmalloc, args.begin(), args.end(), "", AI);
MI = castTo (CI, AI->getType(), "", AI);
DSN->setHeapMarker();
AI->replaceAllUsesWith(MI);
SM.erase(SMI++);
AI->getParent()->getInstList().erase(AI);
++ConvAllocas;
InsertFreesAtEnd(MI);
#ifndef LLVA_KERNEL
if (stackAllocate) {
ArrayMallocs.insert(MI);
}
#endif
} else {
++SMI;
}
} else {
++SMI;
}
} else {
++SMI;
}
}
}
}
