bool CallAnalyzer::visitIntToPtr(IntToPtrInst &I) {
// Propagate constants through ptrtoint.
Constant *COp = dyn_cast<Constant>(I.getOperand(0));
if (!COp)
COp = SimplifiedValues.lookup(I.getOperand(0));
if (COp)
if (Constant *C = ConstantExpr::getIntToPtr(COp, I.getType())) {
SimplifiedValues[&I] = C;
return true;
}
// Track base/offset pairs when round-tripped through a pointer without
// modifications provided the integer is not too large.
Value *Op = I.getOperand(0);
unsigned IntegerSize = Op->getType()->getScalarSizeInBits();
if (TD && IntegerSize <= TD->getPointerSizeInBits()) {
std::pair<Value *, APInt> BaseAndOffset = ConstantOffsetPtrs.lookup(Op);
if (BaseAndOffset.first)
ConstantOffsetPtrs[&I] = BaseAndOffset;
}
// "Propagate" SROA here in the same manner as we do for ptrtoint above.
Value *SROAArg;
DenseMap<Value *, int>::iterator CostIt;
if (lookupSROAArgAndCost(Op, SROAArg, CostIt))
SROAArgValues[&I] = SROAArg;
return isInstructionFree(&I, TD);
}
bool CallAnalyzer::visitIntToPtr(IntToPtrInst &I) {
// Propagate constants through ptrtoint.
if (Constant *COp = dyn_cast<Constant>(I.getOperand(0)))
if (Constant *C = ConstantExpr::getIntToPtr(COp, I.getType())) {
SimplifiedValues[&I] = C;
return true;
}
// Track base/offset pairs when round-tripped through a pointer without
// modifications provided the integer is not too large.
Value *Op = I.getOperand(0);
unsigned IntegerSize = Op->getType()->getScalarSizeInBits();
if (TD && IntegerSize <= TD->getPointerSizeInBits()) {
std::pair<Value *, APInt> BaseAndOffset = ConstantOffsetPtrs.lookup(Op);
if (BaseAndOffset.first)
ConstantOffsetPtrs[&I] = BaseAndOffset;
}
// "Propagate" SROA here in the same manner as we do for ptrtoint above.
Value *SROAArg;
DenseMap<Value *, int>::iterator CostIt;
if (lookupSROAArgAndCost(Op, SROAArg, CostIt))
SROAArgValues[&I] = SROAArg;
// An inttoptr cast is free so long as the input is a legal integer type
// which doesn't contain values outside the range of a pointer.
return TD && TD->isLegalInteger(IntegerSize) &&
IntegerSize <= TD->getPointerSizeInBits();
}
void GraphBuilder::visitIntToPtrInst(IntToPtrInst &I) {
DSNode *N = createNode();
if(I.hasOneUse()) {
if(isa<ICmpInst>(*(I.use_begin()))) {
NumBoringIntToPtr++;
return;
}
} else {
N->setIntToPtrMarker();
N->setUnknownMarker();
}
setDestTo(I, N);
}
/* These next two are caught by the regular verifier on LLVM 5.0+, but we
may want to run this on earlier LLVM versions. */
void GCInvariantVerifier::visitIntToPtrInst(IntToPtrInst &IPI) {
Check(!isSpecialAS(IPI.getAddressSpace()),
"Illegal inttoptr", &IPI);
}
void
visitIntToPtrInst(IntToPtrInst& I)
{
if (isa<FunctionType>(I.getDestTy()))
anyUnknown = true;
}
