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Compiler crashes when fused type is used as part of C++ template specialization #2943

atsuoishimoto opened this issue May 2, 2019 · 0 comments


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commented May 2, 2019

Following Cython code with fused type cannot be compiled with Cython 0.29.7/ Python 3.7.2/Ubuntu linux 18.04.

This error happends only if I use fused type to specialize template.

cdef extern from "func.h":
    void func1[L](L arg);

ctypedef fused Num:

def test(Num n):
    cdef void (*p_func1) (Num)
    p_func1 = func1[Num]

The error is:

1/1] Cythonizing test.pyx
/usr/local/lib/python3.7/site-packages/Cython/Compiler/ FutureWarning: Cython directive 'language_level' not set, using 2 for now (Py2). This will change in a later release! File: /home/ishimoto/src/cython_bug/test.pyx
  tree = Parsing.p_module(s, pxd, full_module_name)

Error compiling Cython file:
ctypedef fused Num:

def test(Num n):
    cdef void (*p_func1) (Num)
    p_func1 = func1[Num]

test.pyx:10:19: Compiler crash in AnalyseExpressionsTransform

ModuleNode.body = StatListNode(test.pyx:2:0)
StatListNode.stats[1] = FusedCFuncDefNode(test.pyx:8:0,
    defaults = [...]/1,
    fused_compound_types = [...]/1,
    match = "dest_sig[{{dest_sig_idx}}] = '{{specialized_type_name}}'",
    no_match = 'dest_sig[{{dest_sig_idx}}] = None',
    nodes = [...]/1,
    specialized_pycfuncs = [...]/1)
FusedCFuncDefNode.stats[1] = DefNode(test.pyx:8:0,
    modifiers = [...]/0,
    name = 'test',
    np_args_idx = [...]/0,
    num_required_args = 1,
    outer_attrs = [...]/2,
    py_wrapper_required = True,
    reqd_kw_flags_cname = '0',
    specialized_signature_string = 'long',
    used = True)
File '', line 436, in analyse_expressions: StatListNode(test.pyx:9:4)
File '', line 5156, in analyse_expressions: SingleAssignmentNode(test.pyx:10:19)
File '', line 5309, in analyse_types: SingleAssignmentNode(test.pyx:10:19)
File '', line 895, in coerce_to: IndexNode(test.pyx:10:19,
    is_subscript = True,
    result_is_used = True,
    type_indices = [...]/1,
    use_managed_ref = True)

Compiler crash traceback from this point on:
  File "/usr/local/lib/python3.7/site-packages/Cython/Compiler/", line 895, in coerce_to
    for signature in src_type.get_all_specialized_function_types():
  File "/usr/local/lib/python3.7/site-packages/Cython/Compiler/", line 2986, in get_all_specialized_function_types
    if self.entry.fused_cfunction:
AttributeError: 'CFuncType' object has no attribute 'entry'
Traceback (most recent call last):
  File "", line 16, in <module>
  File "/usr/local/lib/python3.7/site-packages/Cython/Build/", line 1097, in cythonize
  File "/usr/local/lib/python3.7/site-packages/Cython/Build/", line 1220, in cythonize_one
    raise CompileError(None, pyx_file)
Cython.Compiler.Errors.CompileError: test.pyx
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