[Cython] Cython compiler directives: c_string_encoding

[Hannes Röst]

Dear mailing  list

I am trying to compile a program with Cython using the compiler directives and
I am running into some trouble. Specifically, I am trying to port a Cython 0.18
program to Cython 0.19 and due to changes how char * and Python str are
handled, I need to set the c_string_encoding directive. Unfortunately, this
fails for my project and also in the following testcase when I try to do it
locally:

cimport cython
cdef class TestClass:
    def foo(self):
        with cython.c_string_encoding("ascii"):
            return

If I replace the directive with "with cython.boundscheck(True):" the program
compiles fine. Also adding "#cython: c_string_encoding=ascii" as the first line
of the file works fine. However, adding a decorator
'@cython.c_string_encoding("ascii")' to foo also crashes the compiler. Finally,
compiling with "-X c_string_encoding=ascii" also works.

I was following the documentation provided here
http://docs.cython.org/src/reference/compilation.html . The error message that
I get is attached at the end. Did I do something wrong or can somebody point me
in the right direction?

Best regards

Hannes Roest


Error message:


inimalcase.pyx:6:13: Compiler crash in InterpretCompilerDirectives

ModuleNode.body = StatListNode(minimalcase.pyx:1:0)
StatListNode.stats[1] = StatListNode(minimalcase.pyx:3:5)
StatListNode.stats[0] = CClassDefNode(minimalcase.pyx:3:5,
    as_name = u'TestClass',
    class_name = u'TestClass',
    module_name = '',
    visibility = 'private')
CClassDefNode.body = StatListNode(minimalcase.pyx:5:4)
StatListNode.stats[0] = DefNode(minimalcase.pyx:5:4,
    modifiers = [...]/0,
    name = u'foo',
    num_required_args = 1,
    py_wrapper_required = True,
    reqd_kw_flags_cname = '0')
DefNode.body = StatListNode(minimalcase.pyx:6:13)
StatListNode.stats[0] = WithStatNode(minimalcase.pyx:6:13)

Compiler crash traceback from this point on:
  File "/home/hr/lib/Cython-0.19.1/Cython/Compiler/Visitor.py", line
168, in _visit
    return handler_method(obj)
  File "/home/hr/lib/Cython-0.19.1/Cython/Compiler/ParseTreeTransforms.py",
line 1002, in visit_WithStatNode
    for directive in self.try_to_parse_directives(node.manager) or []:
  File "/home/hr/lib/Cython-0.19.1/Cython/Compiler/ParseTreeTransforms.py",
line 861, in try_to_parse_directives
    directives.append(self.try_to_parse_directive(optname, args, kwds,
node.function.pos))
  File "/home/hr/lib/Cython-0.19.1/Cython/Compiler/ParseTreeTransforms.py",
line 913, in try_to_parse_directive
    assert False
AssertionError: