bool PythonQtDebugAPI::passOwnershipToPython( PyObject* object )
{
if (PyObject_TypeCheck(object, &PythonQtInstanceWrapper_Type)) {
PythonQtInstanceWrapper* wrapper = (PythonQtInstanceWrapper*)object;
wrapper->passOwnershipToPython();
return true;
}
return false;
}
bool PythonQtCallSlot(PythonQtClassInfo* classInfo, QObject* objectToCall, PyObject* args, bool strict, PythonQtSlotInfo* info, void* firstArgument, PyObject** pythonReturnValue, void** directReturnValuePointer, PythonQtPassThisOwnershipType* passThisOwnershipToCPP)
{
static unsigned int recursiveEntry = 0;
if (directReturnValuePointer) {
*directReturnValuePointer = NULL;
}
// store the current storage position, so that we can get back to this state after a slot is called
// (do this locally, so that we have all positions on the stack
PythonQtValueStoragePosition globalValueStoragePos;
PythonQtValueStoragePosition globalPtrStoragePos;
PythonQtValueStoragePosition globalVariantStoragePos;
PythonQtConv::global_valueStorage.getPos(globalValueStoragePos);
PythonQtConv::global_ptrStorage.getPos(globalPtrStoragePos);
PythonQtConv::global_variantStorage.getPos(globalVariantStoragePos);
recursiveEntry++;
// the arguments that are passed to qt_metacall
void* argList[PYTHONQT_MAX_ARGS];
PyObject* result = NULL;
int argc = info->parameterCount();
const QList<PythonQtSlotInfo::ParameterInfo>& params = info->parameters();
const PythonQtSlotInfo::ParameterInfo& returnValueParam = params.at(0);
// set return argument to NULL
argList[0] = NULL;
bool ok = true;
bool skipFirst = false;
PythonQtPassThisOwnershipType passThisOwnership = IgnoreOwnership;
int instanceDecoOffset = 0;
// it is important to keep arg1 on this scope, because it is stored in argList[1] and
// would go away if it is moved into the if scope
void* arg1 = NULL;
if (info->isInstanceDecorator()) {
skipFirst = true;
instanceDecoOffset = 1;
// for decorators on CPP objects, we take the cpp ptr, for QObjects we take the QObject pointer
arg1 = firstArgument;
if (!arg1) {
arg1 = objectToCall;
}
if (arg1) {
// upcast to correct parent class
arg1 = ((char*)arg1)+info->upcastingOffset();
}
argList[1] = &arg1;
}
for (int i = 1 + instanceDecoOffset; i<argc && ok; i++) {
const PythonQtSlotInfo::ParameterInfo& param = params.at(i);
argList[i] = PythonQtConv::ConvertPythonToQt(param, PyTuple_GET_ITEM(args, i - 1 - instanceDecoOffset), strict, classInfo);
if (argList[i]==NULL) {
ok = false;
break;
}
if (param.newOwnerOfThis) {
// (typical use case: setParent(someObject) -> pass ownership of this to someObject)
if (argList[i] && (*(void**)argList[i])==NULL) {
// if the object to which the ownership should be passed is NULL,
// we need to pass the ownership to Python
passThisOwnership = PassOwnershipToPython;
} else {
// if the object is given, pass the ownership to CPP
passThisOwnership = PassOwnershipToCPP;
}
}
}
if (ok) {
if (passThisOwnershipToCPP) {
*passThisOwnershipToCPP = passThisOwnership;
}
// parameters are ok, now create the qt return value which is assigned to by metacall
if (returnValueParam.typeId != QMetaType::Void) {
// create empty default value for the return value
if (!directReturnValuePointer) {
// create empty default value for the return value
argList[0] = PythonQtConv::CreateQtReturnValue(returnValueParam);
if (argList[0]==NULL) {
// return value could not be created, maybe we have a registered class with a default constructor, so that we can construct the pythonqt wrapper object and
// pass its internal pointer
PythonQtClassInfo* info = PythonQt::priv()->getClassInfo(returnValueParam.name);
if (info && info->pythonQtClassWrapper()) {
PyObject* emptyTuple = PyTuple_New(0);
// 1) default construct an empty object as python object (owned by PythonQt), by calling the meta class with empty arguments
result = PyObject_Call((PyObject*)info->pythonQtClassWrapper(), emptyTuple, NULL);
if (result) {
argList[0] = ((PythonQtInstanceWrapper*)result)->_wrappedPtr;
}
Py_DECREF(emptyTuple);
}
}
} else {
// we can use our pointer directly!
argList[0] = directReturnValuePointer;
}
}
PythonQt::ProfilingCB* profilingCB = PythonQt::priv()->profilingCB();
if (profilingCB) {
const char* className = NULL;
if (info->decorator()) {
className = info->decorator()->metaObject()->className();
} else {
className = objectToCall->metaObject()->className();
}
profilingCB(PythonQt::Enter, className, info->signature(), args);
}
// invoke the slot via metacall
bool hadException = false;
QObject* obj = info->decorator()?info->decorator():objectToCall;
if (!obj) {
hadException = true;
PyErr_SetString(PyExc_RuntimeError, "Trying to call a slot on a deleted QObject!");
} else {
try {
obj->qt_metacall(QMetaObject::InvokeMetaMethod, info->slotIndex(), argList);
} catch (std::out_of_range & e) {
hadException = true;
QByteArray what("std::out_of_range: ");
what += e.what();
PyErr_SetString(PyExc_IndexError, what.constData());
} catch (std::bad_alloc & e) {
hadException = true;
QByteArray what("std::bad_alloc: ");
what += e.what();
PyErr_SetString(PyExc_MemoryError, what.constData());
} catch (std::runtime_error & e) {
hadException = true;
QByteArray what("std::runtime_error: ");
what += e.what();
PyErr_SetString(PyExc_RuntimeError, what.constData());
} catch (std::logic_error & e) {
hadException = true;
QByteArray what("std::logic_error: ");
what += e.what();
PyErr_SetString(PyExc_RuntimeError, what.constData());
} catch (std::exception& e) {
hadException = true;
QByteArray what("std::exception: ");
what += e.what();
PyErr_SetString(PyExc_RuntimeError, what.constData());
}
}
if (profilingCB) {
profilingCB(PythonQt::Leave, NULL, NULL, NULL);
}
// handle the return value (which in most cases still needs to be converted to a Python object)
if (!hadException) {
if (argList[0] || returnValueParam.typeId == QMetaType::Void) {
if (directReturnValuePointer) {
result = NULL;
} else {
// the resulting object maybe present already, because we created it above at 1)...
if (!result) {
result = PythonQtConv::ConvertQtValueToPython(returnValueParam, argList[0]);
}
}
} else {
QString e = QString("Called ") + info->fullSignature() + ", return type '" + returnValueParam.name + "' is ignored because it is unknown to PythonQt. Probably you should register it using qRegisterMetaType() or add a default constructor decorator to the class.";
PyErr_SetString(PyExc_ValueError, e.toLatin1().data());
result = NULL;
}
} else {
result = NULL;
}
}
recursiveEntry--;
// reset the parameter storage position to the stored pos to "pop" the parameter stack
PythonQtConv::global_valueStorage.setPos(globalValueStoragePos);
PythonQtConv::global_ptrStorage.setPos(globalPtrStoragePos);
PythonQtConv::global_variantStorage.setPos(globalVariantStoragePos);
*pythonReturnValue = result;
if (result && returnValueParam.passOwnershipToPython) {
// if the ownership should be passed to PythonQt, it has to be a PythonQtInstanceWrapper,
// cast it and pass the ownership
if (PyObject_TypeCheck(result, &PythonQtInstanceWrapper_Type)) {
PythonQtInstanceWrapper* wrapper = (PythonQtInstanceWrapper*)result;
wrapper->passOwnershipToPython();
}
// NOTE: a return value can not pass the ownership to CPP, it would not make sense...
}
// NOTE: it is important to only return here, otherwise the stack will not be popped!!!
return result || (directReturnValuePointer && *directReturnValuePointer);
}
PyObject *PythonQtMemberFunction_Call(PythonQtSlotInfo* info, PyObject* m_self, PyObject *args, PyObject *kw)
{
if (PyObject_TypeCheck(m_self, &PythonQtInstanceWrapper_Type)) {
PythonQtInstanceWrapper* self = (PythonQtInstanceWrapper*) m_self;
if (!info->isClassDecorator() && (self->_obj==NULL && self->_wrappedPtr==NULL)) {
QString error = QString("Trying to call '") + info->slotName() + "' on a destroyed " + self->classInfo()->className() + " object";
PyErr_SetString(PyExc_ValueError, error.toLatin1().data());
return NULL;
} else {
PythonQtPassThisOwnershipType ownership;
PyObject* result = PythonQtSlotFunction_CallImpl(self->classInfo(), self->_obj, info, args, kw, self->_wrappedPtr, NULL, &ownership);
if (ownership == PassOwnershipToCPP) {
self->passOwnershipToCPP();
} else if (ownership == PassOwnershipToPython) {
self->passOwnershipToPython();
}
return result;
}
} else if (m_self->ob_type == &PythonQtClassWrapper_Type) {
PythonQtClassWrapper* type = (PythonQtClassWrapper*) m_self;
if (info->isClassDecorator()) {
return PythonQtSlotFunction_CallImpl(type->classInfo(), NULL, info, args, kw);
} else {
// otherwise, it is an unbound call and we have an instanceDecorator or normal slot...
Py_ssize_t argc = PyTuple_Size(args);
if (argc>0) {
PyObject* firstArg = PyTuple_GET_ITEM(args, 0);
if (PyObject_TypeCheck(firstArg, (PyTypeObject*)&PythonQtInstanceWrapper_Type)
&& ((PythonQtInstanceWrapper*)firstArg)->classInfo()->inherits(type->classInfo())) {
PythonQtInstanceWrapper* self = (PythonQtInstanceWrapper*)firstArg;
if (!info->isClassDecorator() && (self->_obj==NULL && self->_wrappedPtr==NULL)) {
QString error = QString("Trying to call '") + info->slotName() + "' on a destroyed " + self->classInfo()->className() + " object";
PyErr_SetString(PyExc_ValueError, error.toLatin1().data());
return NULL;
}
// strip the first argument...
PyObject* newargs = PyTuple_GetSlice(args, 1, argc);
PythonQtPassThisOwnershipType ownership;
PyObject* result = PythonQtSlotFunction_CallImpl(self->classInfo(), self->_obj, info, newargs, kw, self->_wrappedPtr, NULL, &ownership);
if (ownership == PassOwnershipToCPP) {
self->passOwnershipToCPP();
} else if (ownership == PassOwnershipToPython) {
self->passOwnershipToPython();
}
Py_DECREF(newargs);
return result;
} else {
// first arg is not of correct type!
QString error = "slot " + info->fullSignature() + " requires " + type->classInfo()->className() + " instance as first argument, got " + firstArg->ob_type->tp_name;
PyErr_SetString(PyExc_ValueError, error.toLatin1().data());
return NULL;
}
} else {
// wrong number of args
QString error = "slot " + info->fullSignature() + " requires " + type->classInfo()->className() + " instance as first argument.";
PyErr_SetString(PyExc_ValueError, error.toLatin1().data());
return NULL;
}
}
}
return NULL;
}