[Pyrex] Unlucky fellow needs help (pyrex crashes)

[Helmut Jarausch]

Hi helpful souls,

unfortunately I managed to either crash Pyrex or
to let Pyrex crash my process (segment fault)
What ill things have I committed?

Any help is much appreciated,
Helut


Both cases are only tiny variants by rearranged
code. I try to return a derived object for iteration.

Both are invoked by
import I_Test

IT= I_Test.ITNO()

for i in IT.list(1,3):
  print i

---------------------------------

Variant I crashes Pyrex

# Pyrex iterator test

cdef class ITNO    # forward declaration

cdef class ITNO_List(ITNO):
  cdef int cnt
  cdef int From
  cdef int To

  def __new__(self,int _from, int _to) :
    self.From= _from
    self.To  = _to
  
  def __iter__(self) :
    self.cnt= _from-1
    return self
  
  def __next__(self):
    if self.cnt >= self.To :
      raise StopIteration
    self.cnt= self.cnt+1
    return self.cnt*self.base

cdef class ITNO:
  cdef base
  def __new__(self):
    self.base= 7

  def list(self,_from,_to):
    return ITNO_List(_from,_to)

----------

it gives

% pyrexc I_Test.pyx
Traceback (most recent call last):
  File "/usr/local/bin/pyrexc", line 8, in ?
    main(command_line = 1)
  File "/usr/local/lib/python2.4/site-packages/Pyrex/Compiler/Main.py", line 271, in main
    result = context.compile(source, options)
  File "/usr/local/lib/python2.4/site-packages/Pyrex/Compiler/Main.py", line 175, in compile
    tree.process_implementation(scope, result)
  File "/usr/local/lib/python2.4/site-packages/Pyrex/Compiler/Nodes.py", line 110, in process_implementation
    self.analyse_declarations(env)
  File "/usr/local/lib/python2.4/site-packages/Pyrex/Compiler/Nodes.py", line 107, in analyse_declarations
    self.body.analyse_declarations(env)
  File "/usr/local/lib/python2.4/site-packages/Pyrex/Compiler/Nodes.py", line 1264, in analyse_declarations
    stat.analyse_declarations(env)
  File "/usr/local/lib/python2.4/site-packages/Pyrex/Compiler/Nodes.py", line 2365, in analyse_declarations
    typedef_flag = self.typedef_flag)
  File "/usr/local/lib/python2.4/site-packages/Pyrex/Compiler/Symtab.py", line 672, in declare_c_class
    scope.declare_inherited_c_attributes(base_type.scope)
  File "/usr/local/lib/python2.4/site-packages/Pyrex/Compiler/Symtab.py", line 1026, in declare_inherited_c_attributes
    for base_entry in \
AttributeError: 'NoneType' object has no attribute 'inherited_var_entries'

=================================================================

Variant II is accepted by pyrexc but
gives a segment fault while running the loop

---------------------
# Pyrex iterator test

cdef class ITNO             # forward declaration
cdef class ITNO_List(ITNO)  # forward declaration

cdef class ITNO:
  cdef base
  def __new__(self):
    self.base= 7

  def list(self, int _from, int _to):
    return ITNO_List(_from,_to)

cdef class ITNO_List(ITNO):
  cdef int cnt
  cdef int From
  cdef int To
  
  def __new__(self, int _from, int _to):
    self.From= _from
    self.To  = _to

  def __iter__(self) :
    self.cnt= self.From-1
    return self
  
  def __next__(self):
    if self.cnt >= self.To : raise StopIteration
    self.cnt= self.cnt+1
    return self.cnt*self.base

-- 
Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany