AttributeError: 'CppClassType' object has no attribute 'vtabptr_cname'

[pitrou]

This is with 0.28.1. The CArrayData class is declared as follows:

    cdef cppclass CArrayData" arrow::ArrayData":
        shared_ptr[CDataType] type
        int64_t length
        int64_t null_count
        int64_t offset
        vector[shared_ptr[CBuffer]] buffers
        vector[shared_ptr[CArrayData]] child_data

        @staticmethod
        shared_ptr[CArrayData] Make(const shared_ptr[CDataType]& type,
                                    int64_t length,
                                    const vector[shared_ptr[CBuffer]]& buffers,
                                    int64_t null_count=-1,
                                    int64_t offset=0)

When trying to compile the given code:

cdef class Array:
    # [snip other methods]

    @staticmethod
    def from_buffers(DataType type, length, buffers, null_count=-1, offset=0):
        cdef:
            Buffer buf
            vector[shared_ptr[CBuffer]] c_buffers
            shared_ptr[CArrayData] ad

        for buf in buffers:
            c_buffers.push_back(buf.buffer)
        ad = CArrayData.Make(type.sp_type, length, c_buffers, null_count, offset)
        return pyarrow_wrap_array(MakeArray(ad))

Cython crashes with the following error:

Error compiling Cython file:
------------------------------------------------------------
...
            vector[shared_ptr[CBuffer]] c_buffers
            shared_ptr[CArrayData] ad

        for buf in buffers:
            c_buffers.push_back(buf.buffer)
        ad = CArrayData.Make(type.sp_type, length, c_buffers, null_count, offset)
                      ^
------------------------------------------------------------

/home/antoine/arrow/python/pyarrow/array.pxi:385:23: Compiler crash in AnalyseExpressionsTransform

ModuleNode.body = StatListNode(lib.pyx:22:0)
StatListNode.stats[51] = StatListNode(array.pxi:19:0)
StatListNode.stats[15] = CClassDefNode(array.pxi:273:5,
    as_name = 'Array',
    class_name = 'Array',
    module_name = '',
    visibility = 'private')
CClassDefNode.body = StatListNode(array.pxi:275:4)
StatListNode.stats[7] = CompilerDirectivesNode(array.pxi:377:4)
CompilerDirectivesNode.body = StatListNode(array.pxi:377:4)
StatListNode.stats[0] = DefNode(array.pxi:377:4,
    is_staticmethod = True,
    modifiers = [...]/0,
    name = 'from_buffers',
    np_args_idx = [...]/0,
    num_required_args = 3,
    py_wrapper_required = True,
    reqd_kw_flags_cname = '0',
    self_in_stararg = True,
    used = True)
File 'Nodes.py', line 432, in analyse_expressions: StatListNode(array.pxi:378:8,
    is_terminator = True)
File 'Nodes.py', line 432, in analyse_expressions: StatListNode(array.pxi:385:28)
File 'Nodes.py', line 5090, in analyse_expressions: SingleAssignmentNode(array.pxi:385:28)
File 'Nodes.py', line 5210, in analyse_types: SingleAssignmentNode(array.pxi:385:28)
File 'ExprNodes.py', line 5393, in analyse_types: SimpleCallNode(array.pxi:385:28,
    analysed = True,
    result_is_used = True,
    use_managed_ref = True)
File 'ExprNodes.py', line 6732, in analyse_types: AttributeNode(array.pxi:385:23,
    attribute = 'Make',
    initialized_check = True,
    is_attribute = 1,
    is_called = 1,
    needs_none_check = True,
    result_is_used = True,
    use_managed_ref = True)
File 'ExprNodes.py', line 6793, in analyse_as_type_attribute: AttributeNode(array.pxi:385:23,
    attribute = 'Make',
    initialized_check = True,
    is_attribute = 1,
    is_called = 1,
    needs_none_check = True,
    result_is_used = True,
    use_managed_ref = True)

Compiler crash traceback from this point on:
  File "/home/antoine/miniconda3/envs/pyarrow/lib/python3.6/site-packages/Cython/Compiler/ExprNodes.py", line 6793, in analyse_as_type_attribute
    cname = "%s->%s" % (type.vtabptr_cname, entry.cname)
AttributeError: 'CppClassType' object has no attribute 'vtabptr_cname'

[pitrou]

The crash disappears if I remove the default argument values, i.e. if I turn the method declaration to:

        @staticmethod
        shared_ptr[CArrayData] Make(const shared_ptr[CDataType]& type,
                                    int64_t length,
                                    const vector[shared_ptr[CBuffer]]& buffers,
                                    int64_t null_count,
                                    int64_t offset)

[godlygeek]

I bumped into this problem today as well. Here's a minimal reproducer, using the Cython magic for IPython:

In [1]: %load_ext cython

In [2]: %%cython -+
   ...: cdef extern from *:
   ...:     cdef cppclass SomeClass:
   ...:         @staticmethod
   ...:         void func(int a, int b=0)
   ...:
   ...: SomeClass.func(1,2)
   ...:
   ...:

That results in:

Error compiling Cython file:
------------------------------------------------------------
...
cdef extern from *:
    cdef cppclass SomeClass:
        @staticmethod
        void func(int a, int b=0)

SomeClass.func(1,2)
        ^
------------------------------------------------------------

.cache/ipython/cython/_cython_magic_c961a377a1670543c84a8818f0ec9563.pyx:6:9: Compiler crash in AnalyseExpressionsTransform

File 'Nodes.py', line 435, in analyse_expressions: StatListNode(_cython_magic_c961a377a1670543c84a8818f0ec9563.pyx:1:0)
File 'Nodes.py', line 5138, in analyse_expressions: ExprStatNode(_cython_magic_c961a377a1670543c84a8818f0ec9563.pyx:6:14)
File 'ExprNodes.py', line 587, in analyse_expressions: SimpleCallNode(_cython_magic_c961a377a1670543c84a8818f0ec9563.pyx:6:14,
    analysed = True,
    use_managed_ref = True)
File 'ExprNodes.py', line 5546, in analyse_types: SimpleCallNode(_cython_magic_c961a377a1670543c84a8818f0ec9563.pyx:6:14,
    analysed = True,
    use_managed_ref = True)
File 'ExprNodes.py', line 6881, in analyse_types: AttributeNode(_cython_magic_c961a377a1670543c84a8818f0ec9563.pyx:6:9,
    attribute = 'func',
    initialized_check = True,
    is_attribute = 1,
    is_called = 1,
    needs_none_check = True,
    result_is_used = True,
    use_managed_ref = True)
File 'ExprNodes.py', line 6942, in analyse_as_type_attribute: AttributeNode(_cython_magic_c961a377a1670543c84a8818f0ec9563.pyx:6:9,
    attribute = 'func',
    initialized_check = True,
    is_attribute = 1,
    is_called = 1,
    needs_none_check = True,
    result_is_used = True,
    use_managed_ref = True)

Compiler crash traceback from this point on:
  File "/home/mwoznisk/.local/lib/python3.8/site-packages/Cython/Compiler/ExprNodes.py", line 6942, in analyse_as_type_attribute
    cname = "%s->%s" % (type.vtabptr_cname, entry.cname)
AttributeError: 'CppClassType' object has no attribute 'vtabptr_cname'

[dgrunwald-qt]

Still reproduces with cython 3.0.2.

[dgrunwald]

Still reproduces after the changes in #3235.
Fortunately the workaround for this one is easy: remove default argument values; instead e.g. declare multiple overloads for the different parameter counts.