Bug 365 – Generatorrunner segfaults in AbstractMetaType::minimalSignature()

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Bug 365 - Generatorrunner segfaults in AbstractMetaType::minimalSignature()

Summary:

Generatorrunner segfaults in AbstractMetaType::minimalSignature()

Status:	CLOSED FIXED

Product:	PySide
Classification:	Unclassified
Component:	Shiboken
Version:	0.6.1
Platform:	PC Linux

Importance:	P3 normal
Assigned To:	Marcelo Lira

URL:

Depends on:
Blocks:
	Show dependency tree / graph

Reported:	2010-09-17 19:24 EEST by msonnemann
Modified:	2010-10-13 13:48 EEST (History)
CC List:	8 users (show)

See Also:

Attachments
Qwt binding (20.00 KB, application/octet-stream) 2010-09-17 19:24 EEST, msonnemann	Details
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Description msonnemann 2010-09-17 19:24:39 EEST

Created attachment 87 [details]
Qwt binding

Trying to bind Qwt with generatorrunner fails with a segmentation fault.

Expected behavior:
    generatorrunner builds a binding library that is callable from within
Python
    and which exposes an interface to the components of the Qwt library (
    http://qwt.sourceforge.net/).

Observed behavior:
    generatorrunner fails with the following messages (run from gdb):

    Generating class model...                    [WARNING]
    Unable to decide type of property: 'QBrush' in class 'QwtThermo'
    Unable to decide type of property: 'QColor' in class 'QwtThermo'
    Unable to decide type of property: 'QPen' in class 'QwtPicker'
    Unable to decide type of property: 'QFont' in class 'QwtPicker'


    Generating enum model...                     [OK]
    Generating namespace model...                [OK]
    Resolving typedefs...                        [OK]

    Program received signal SIGSEGV, Segmentation fault.
    0x00007ffff791628b in AbstractMetaType::minimalSignature() const ()
       from /usr/local/lib/libapiextractor.so.0.8

Program versions:
    generatorrunner: 0.6.1
    shiboken       : 0.6.1
    apiextractor   : 0.8.1
    Qt             : 4.4.7
    Qwt            : 5.2.0

Attached is the Qwt binding project. Run qwtbinding/data/make.sh.

Comment 1 msonnemann 2010-09-19 12:58:31 EEST

It seems that AbstractMetaFunction::minimalSignature() tries to dereference a
null pointer in the loop over the argument list:

minimalSignature += t->minimalSignature(); // <-- t == 0

But I have no idea where that pointer is added to m_arguments.

Comment 2 Marcelo Lira 2010-09-23 14:02:08 EEST

The bug is triggered when a function argument is an array of a size defined by
something other than a literal number.

In other words, this breaks ApiExtractor:

enum SomeEnum { Value0, Value1, NValues };
struct A {
    void method(int[NValues]);
};

And this works fine:

struct A {
    void method(int[3]);
};

I'm producing a proper test and also working on the fix.

Comment 3 Marcelo Lira 2010-09-24 10:44:20 EEST

Fixed in commit ApiExtractor/c5f6e116.

Comment 4 Marcelo Lira 2010-09-24 10:48:54 EEST

msonnemann@online.de
I'd suggest you update your type system file to use nested tags for your enums.
Check bug #370 for more details:
http://bugs.openbossa.org/show_bug.cgi?id=370

Comment 5 renato filho 2010-10-13 13:48:46 EEST

released on PySide 0.4.2