/// Like ValueIsPHI but also check if the PHI has no source
/// operands, i.e., it was just added.
static SILArgument *ValueIsNewPHI(SILValue Val, SILSSAUpdater *Updater) {
SILArgument *PHI = ValueIsPHI(Val, Updater);
if (PHI) {
auto *PhiBB = PHI->getParent();
size_t PhiIdx = PHI->getIndex();
// If all predecessor edges are 'not set' this is a new phi.
for (auto *PredBB : PhiBB->getPreds()) {
OperandValueArrayRef Edges =
getEdgeValuesForTerminator(PredBB->getTerminator(), PhiBB);
assert(PhiIdx < Edges.size() && "Not enough edges!");
SILValue V = Edges[PhiIdx];
// Check for the 'not set' sentinel.
if (V.getDef() != Updater->PHISentinel.get())
return nullptr;
}
return PHI;
}
return nullptr;
}
Effects *FunctionEffects::getEffectsOn(SILValue Addr) {
SILValue BaseAddr = skipValueProjections(skipAddrProjections(Addr));
switch (BaseAddr->getKind()) {
case swift::ValueKind::SILArgument: {
// Can we associate the address to a function parameter?
SILArgument *Arg = cast<SILArgument>(BaseAddr);
if (Arg->isFunctionArg()) {
return &ParamEffects[Arg->getIndex()];
}
break;
}
case ValueKind::AllocStackInst:
case ValueKind::AllocRefInst:
case ValueKind::AllocRefDynamicInst:
case ValueKind::AllocBoxInst:
// Effects on locally allocated storage.
return &LocalEffects;
default:
break;
}
// Everything else.
return &GlobalEffects;
}