[PyQt] infinite recursion bug in SIP generated code

[Gerard Vermeulen]

Hi,

I ran into an infinite recursion bug in SIP generated code.
The bug is present in the latest snapshot but also in the 4.7.7
release.

After enabling the sip tracing flags, I get:

...
RGBA sipStandardColor::operator()(double,double,double) const
(this=0x0158bef0) RGBA
sipStandardColor::operator()(double,double,double) const
(this=0x0158bef0) RGBA
sipStandardColor::operator()(double,double,double) const
(this=0x0158bef0) Exception RuntimeError: 'maximum recursion depth
exceeded in __subclasscheck__' in <type 'exceptions.RuntimeError'>
ignored Exception RuntimeError: 'maximum recursion depth exceeded in
__subclasscheck__' in <type 'exceptions.RuntimeError'> ignored Error in
sys.excepthook: RuntimeError: maximum recursion depth exceeded while
calling a Python object

Original exception was:
RuntimeError: maximum recursion depth exceeded while calling a Python
object Exception RuntimeError: 'maximum recursion depth exceeded while
calling a Python object' in <type 'exceptions.RuntimeError'> ignored
RuntimeError
dealloc_RGBA()
dealloc_RGBA()
dealloc_RGBA()
...


The sip file is:

class Color
{

%TypeHeaderCode
#include <qwt3d_color.h>
#include <sip_Qwt3DColorVector.h>
using namespace Qwt3D;
%End // %TypeHeaderCode

public:
    virtual RGBA operator()(double, double, double) const = 0;
    virtual RGBA operator()(const Triple &) const;
    virtual ColorVector & createVector(ColorVector &);
    void destroy() const;

protected:
    virtual ~Color();

}; // class Color


class StandardColor: Color
{

%TypeHeaderCode
#include <qwt3d_color.h>
#include <sip_Qwt3DColorVector.h>
using namespace Qwt3D;
%End // %TypeHeaderCode

public:
    StandardColor(Plot3D * /TransferThis/, unsigned = 100);
    virtual RGBA operator()(double, double, double) const;
    void setColorVector(const ColorVector &);
    void reset(unsigned = 100);
    void setAlpha(double);
    ColorVector & createVector(ColorVector &);

//protected:
//    ColorVector colors_ /PyName=colors/;
//    Plot3D * data_ /PyName=data/;

}; // class StandardColor


and the Python snippet showing the bug:

    def setColor(self):
        i, step = 252, 4
        colorVector = ColorVector()
        while (i>=0):
            colorVector.push_back(RGBA(i/255.0, max((i-60)/255.0, 0.0),
0.0)) step -= 1
            if step == 0:
                i -= 4
                step = 4
# BUG:        color = StandardColor(self.plot)
# BUG:        color.setColorVector(colorVector)
# BUG:        self.plot.setDataColor(color)


Uncommenting the "# BUG:" out-commented lines makes the bug show up.

Regards -- Gerard