ManagedValue ManagedValue::borrow(SILGenFunction &SGF, SILLocation loc) const {
assert(getValue() && "cannot borrow an invalid or in-context value");
if (isLValue())
return *this;
if (getType().isAddress())
return ManagedValue::forUnmanaged(getValue());
return SGF.emitManagedBeginBorrow(loc, getValue());
}
ManagedValue ManagedValue::materialize(SILGenFunction &SGF,
SILLocation loc) const {
auto temporary = SGF.emitTemporaryAllocation(loc, getType());
bool hadCleanup = hasCleanup();
// The temporary memory is +0 if the value was.
if (hadCleanup) {
SGF.B.emitStoreValueOperation(loc, forward(SGF), temporary,
StoreOwnershipQualifier::Init);
// SEMANTIC SIL TODO: This should really be called a temporary LValue.
return ManagedValue::forOwnedAddressRValue(temporary,
SGF.enterDestroyCleanup(temporary));
} else {
auto object = SGF.emitManagedBeginBorrow(loc, getValue());
SGF.emitManagedStoreBorrow(loc, object.getValue(), temporary);
return ManagedValue::forBorrowedAddressRValue(temporary);
}
}
