General discussion about the Cython source code generator for Python extensions

Lisandro Dalcin | 1 Oct 2010 22:36

Re: [Cython] cython compiler crash

On 1 October 2010 15:17, Vineet Jain <vinjvinj <at> gmail.com> wrote:
> Last night while trying out the following cython example:
>
>    http://dpinte.wordpress.com/2010/04/22/interfacing-ta-lib-with-cython/
>
> I got the following crash in the cython compiler (cython version 0.13):
>
> Compiler crash traceback from this point on:
>  File "Visitor.py", line 179, in
> Cython.Compiler.Visitor.TreeVisitor.visitchild
> (/tmp/easy_install-fEGaFj/Cython-0.13/Cython/Compiler/Visitor.c:3407)
>  File "Visitor.py", line 28, in
> Cython.Compiler.Visitor.BasicVisitor.visit
> (/tmp/easy_install-fEGaFj/Cython-0.13/Cython/Compiler/Visitor.c:1178)
>  File "/usr/local/lib/python2.6/dist-packages/Cython-0.13-py2.6-linux-x86_64.egg/
> Cython/Compiler/Buffer.py",
> line 106, in visit_FuncDefNode
>    self.handle_scope(node, node.local_scope)
>  File "/usr/local/lib/python2.6/dist-packages/Cython-0.13-py2.6-linux-x86_64.egg/
> Cython/Compiler/Buffer.py",
> line 61, in handle_scope
>    if entry.type.dtype.is_ptr:
> AttributeError: 'NoneType' object has no attribute 'is_ptr'
> building 'talib' extension
>
> gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall
> -Wstrict-prototypes -fPIC
> -I/usr/local/lib/python2.6/dist-packages/numpy/core/include
> -I/usr/local/include/ta-lib/ -I/usr/include/python2.6 -c talib.c -o
> build/temp.linux-x86_64-2.6/talib.o

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Vineet Jain | 1 Oct 2010 23:00

Re: [Cython] cython compiler crash

Problem was a typo:

cdef np.ndarray[np, ndim=1] outreal = numpy.zeros_like(inreal)

should have been:

cdef np.ndarray[np.float_t, ndim=1] outreal = numpy.zeros_like(inreal)

Which caused the compiler to crash.

On Fri, Oct 1, 2010 at 4:36 PM, Lisandro Dalcin <dalcinl@...> wrote:
> On 1 October 2010 15:17, Vineet Jain <vinjvinj@...> wrote:
>> Last night while trying out the following cython example:
>>
>>    http://dpinte.wordpress.com/2010/04/22/interfacing-ta-lib-with-cython/
>>
>> I got the following crash in the cython compiler (cython version 0.13):
>>
>> Compiler crash traceback from this point on:
>>  File "Visitor.py", line 179, in
>> Cython.Compiler.Visitor.TreeVisitor.visitchild
>> (/tmp/easy_install-fEGaFj/Cython-0.13/Cython/Compiler/Visitor.c:3407)
>>  File "Visitor.py", line 28, in
>> Cython.Compiler.Visitor.BasicVisitor.visit
>> (/tmp/easy_install-fEGaFj/Cython-0.13/Cython/Compiler/Visitor.c:1178)
>>  File "/usr/local/lib/python2.6/dist-packages/Cython-0.13-py2.6-linux-x86_64.egg/
>> Cython/Compiler/Buffer.py",
>> line 106, in visit_FuncDefNode
>>    self.handle_scope(node, node.local_scope)
>>  File "/usr/local/lib/python2.6/dist-packages/Cython-0.13-py2.6-linux-x86_64.egg/

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Lisandro Dalcin | 1 Oct 2010 23:05

Re: [Cython] cython compiler crash

On 1 October 2010 18:00, Vineet Jain <vinjvinj@...> wrote:
> Problem was a typo:
>
> cdef np.ndarray[np, ndim=1] outreal = numpy.zeros_like(inreal)
>
> should have been:
>
> cdef np.ndarray[np.float_t, ndim=1] outreal = numpy.zeros_like(inreal)
>
> Which caused the compiler to crash.
>

OK, now all is clear. Anyway, Cython should not crash. We should fix this.

--

-- 
Lisandro Dalcin
---------------
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Robert Bradshaw | 3 Oct 2010 08:51

Re: [Cython] cython compiler crash

On Fri, Oct 1, 2010 at 2:05 PM, Lisandro Dalcin <dalcinl@...> wrote:
> On 1 October 2010 18:00, Vineet Jain <vinjvinj@...> wrote:
>> Problem was a typo:
>>
>> cdef np.ndarray[np, ndim=1] outreal = numpy.zeros_like(inreal)
>>
>> should have been:
>>
>> cdef np.ndarray[np.float_t, ndim=1] outreal = numpy.zeros_like(inreal)
>>
>> Which caused the compiler to crash.
>>
>
> OK, now all is clear. Anyway, Cython should not crash. We should fix this.

Fixed. http://trac.cython.org/cython_trac/ticket/579

When trying to write a test case, I noticed that buffers are not very
good at continuing once they hit an error... This should be improved.

- Robert