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PropertyProxy.cxx
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PropertyProxy.cxx
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// @(#)root/pyroot:$Id$
// Author: Wim Lavrijsen, Jan 2005
// Bindings
#include "PyROOT.h"
#include "PyStrings.h"
#include "PropertyProxy.h"
#include "ObjectProxy.h"
#include "Utility.h"
namespace PyROOT {
enum ETypeDetails {
kNone = 0,
kIsStaticData = 1,
kIsEnumData = 2,
kIsConstData = 4,
kIsArrayType = 8
};
namespace {
//= PyROOT property proxy property behaviour =================================
PyObject* pp_get( PropertyProxy* pyprop, ObjectProxy* pyobj, PyObject* )
{
// normal getter access
void* address = pyprop->GetAddress( pyobj );
if ( ! address || (ptrdiff_t)address == -1 /* Cling error */ )
return 0;
// for fixed size arrays
void* ptr = address;
if ( pyprop->fProperty & kIsArrayType )
ptr = &address;
// not-initialized or public data accesses through class (e.g. by help())
if ( ! ptr || (ptrdiff_t)ptr == -1 /* Cling error */ ) {
Py_INCREF( pyprop );
return (PyObject*)pyprop;
}
if ( pyprop->fConverter != 0 ) {
PyObject* result = pyprop->fConverter->FromMemory( ptr );
if ( ! result )
return result;
// ensure that the encapsulating class does not go away for the duration
// of the data member's lifetime, if it is a bound type (it doesn't matter
// for builtin types, b/c those are copied over into python types and thus
// end up being "stand-alone")
if ( pyobj && ObjectProxy_Check( result ) ) {
if ( PyObject_SetAttr( result, PyStrings::gLifeLine, (PyObject*)pyobj ) == -1 )
PyErr_Clear(); // ignored
}
return result;
}
PyErr_Format( PyExc_NotImplementedError,
"no converter available for \"%s\"", pyprop->GetName().c_str() );
return 0;
}
////////////////////////////////////////////////////////////////////////////////
/// Set the value of the C++ datum held.
int pp_set( PropertyProxy* pyprop, ObjectProxy* pyobj, PyObject* value )
{
const int errret = -1;
// filter const objects to prevent changing their values
if ( ( pyprop->fProperty & kIsConstData ) ) {
PyErr_SetString( PyExc_TypeError, "assignment to const data not allowed" );
return errret;
}
ptrdiff_t address = (ptrdiff_t)pyprop->GetAddress( pyobj );
if ( ! address || address == -1 /* Cling error */ )
return errret;
// for fixed size arrays
void* ptr = (void*)address;
if ( pyprop->fProperty & kIsArrayType )
ptr = &address;
// actual conversion; return on success
if ( pyprop->fConverter && pyprop->fConverter->ToMemory( value, ptr ) )
return 0;
// set a python error, if not already done
if ( ! PyErr_Occurred() )
PyErr_SetString( PyExc_RuntimeError, "property type mismatch or assignment not allowed" );
// failure ...
return errret;
}
//= PyROOT property proxy construction/destruction ===========================
PropertyProxy* pp_new( PyTypeObject* pytype, PyObject*, PyObject* )
{
// Create and initialize a new property descriptor.
PropertyProxy* pyprop = (PropertyProxy*)pytype->tp_alloc( pytype, 0 );
pyprop->fOffset = 0;
pyprop->fProperty = 0;
pyprop->fConverter = 0;
pyprop->fEnclosingScope = 0;
new ( &pyprop->fName ) std::string();
return pyprop;
}
////////////////////////////////////////////////////////////////////////////////
/// Deallocate memory held by this descriptor.
void pp_dealloc( PropertyProxy* pyprop )
{
using namespace std;
delete pyprop->fConverter;
pyprop->fName.~string();
Py_TYPE(pyprop)->tp_free( (PyObject*)pyprop );
}
} // unnamed namespace
//= PyROOT property proxy type ===============================================
PyTypeObject PropertyProxy_Type = {
PyVarObject_HEAD_INIT( &PyType_Type, 0 )
(char*)"ROOT.PropertyProxy", // tp_name
sizeof(PropertyProxy), // tp_basicsize
0, // tp_itemsize
(destructor)pp_dealloc, // tp_dealloc
0, // tp_print
0, // tp_getattr
0, // tp_setattr
0, // tp_compare
0, // tp_repr
0, // tp_as_number
0, // tp_as_sequence
0, // tp_as_mapping
0, // tp_hash
0, // tp_call
0, // tp_str
0, // tp_getattro
0, // tp_setattro
0, // tp_as_buffer
Py_TPFLAGS_DEFAULT, // tp_flags
(char*)"PyROOT property proxy (internal)", // tp_doc
0, // tp_traverse
0, // tp_clear
0, // tp_richcompare
0, // tp_weaklistoffset
0, // tp_iter
0, // tp_iternext
0, // tp_methods
0, // tp_members
0, // tp_getset
0, // tp_base
0, // tp_dict
(descrgetfunc)pp_get, // tp_descr_get
(descrsetfunc)pp_set, // tp_descr_set
0, // tp_dictoffset
0, // tp_init
0, // tp_alloc
(newfunc)pp_new, // tp_new
0, // tp_free
0, // tp_is_gc
0, // tp_bases
0, // tp_mro
0, // tp_cache
0, // tp_subclasses
0 // tp_weaklist
#if PY_VERSION_HEX >= 0x02030000
, 0 // tp_del
#endif
#if PY_VERSION_HEX >= 0x02060000
, 0 // tp_version_tag
#endif
#if PY_VERSION_HEX >= 0x03040000
, 0 // tp_finalize
#endif
};
} // namespace PyROOT
//- public members -----------------------------------------------------------
void PyROOT::PropertyProxy::Set( Cppyy::TCppScope_t scope, Cppyy::TCppIndex_t idata )
{
fEnclosingScope = scope;
fName = Cppyy::GetDatamemberName( scope, idata );
fOffset = Cppyy::GetDatamemberOffset( scope, idata );
fProperty = Cppyy::IsStaticData( scope, idata ) ? kIsStaticData : 0;
Int_t size = Cppyy::GetDimensionSize( scope, idata, 0 );
if ( 0 < size )
fProperty |= kIsArrayType;
std::string fullType = Cppyy::GetDatamemberType( scope, idata );
if ( Cppyy::IsEnumData( scope, idata ) ) {
fullType = "UInt_t";
fProperty |= kIsEnumData;
}
if ( Cppyy::IsConstData( scope, idata ) )
fProperty |= kIsConstData;
fConverter = CreateConverter( fullType, size );
}
////////////////////////////////////////////////////////////////////////////////
void PyROOT::PropertyProxy::Set( Cppyy::TCppScope_t scope, const std::string& name, void* address )
{
fEnclosingScope = scope;
fName = name;
fOffset = (ptrdiff_t)address;
fProperty = (kIsStaticData | kIsConstData | kIsEnumData /* true, but may chance */ );
fConverter = CreateConverter( "UInt_t", -1 );
}
////////////////////////////////////////////////////////////////////////////////
/// class attributes, global properties
void* PyROOT::PropertyProxy::GetAddress( ObjectProxy* pyobj ) {
if ( fProperty & kIsStaticData )
return (void*)fOffset;
// special case: non-static lookup through class
if ( ! pyobj )
return 0;
// instance attributes; requires valid object for full address
if ( ! ObjectProxy_Check( pyobj ) ) {
PyErr_Format( PyExc_TypeError,
"object instance required for access to property \"%s\"", GetName().c_str() );
return 0;
}
void* obj = pyobj->GetObject();
if ( ! obj ) {
PyErr_SetString( PyExc_ReferenceError, "attempt to access a null-pointer" );
return 0;
}
// the proxy's internal offset is calculated from the enclosing class
ptrdiff_t offset = 0;
if ( pyobj->ObjectIsA() != fEnclosingScope)
offset = Cppyy::GetBaseOffset( pyobj->ObjectIsA(), fEnclosingScope, obj, 1 /* up-cast */ );
return (void*)((ptrdiff_t)obj + offset + fOffset);
}