Revert ymake build from ydb oss export

1 files changed, 0 insertions, 858 deletions

diff --git a/contrib/tools/cython/Cython/Compiler/MemoryView.py b/contrib/tools/cython/Cython/Compiler/MemoryView.py
deleted file mode 100644
index 0406d6c716..0000000000
--- a/contrib/tools/cython/Cython/Compiler/MemoryView.py
+++ /dev/null
@@ -1,858 +0,0 @@
-from __future__ import absolute_import
-
-from .Errors import CompileError, error
-from . import ExprNodes
-from .ExprNodes import IntNode, NameNode, AttributeNode
-from . import Options
-from .Code import UtilityCode, TempitaUtilityCode
-from .UtilityCode import CythonUtilityCode
-from . import Buffer
-from . import PyrexTypes
-from . import ModuleNode
-
-START_ERR = "Start must not be given."
-STOP_ERR = "Axis specification only allowed in the 'step' slot."
-STEP_ERR = "Step must be omitted, 1, or a valid specifier."
-BOTH_CF_ERR = "Cannot specify an array that is both C and Fortran contiguous."
-INVALID_ERR = "Invalid axis specification."
-NOT_CIMPORTED_ERR = "Variable was not cimported from cython.view"
-EXPR_ERR = "no expressions allowed in axis spec, only names and literals."
-CF_ERR = "Invalid axis specification for a C/Fortran contiguous array."
-ERR_UNINITIALIZED = ("Cannot check if memoryview %s is initialized without the "
-                     "GIL, consider using initializedcheck(False)")
-
-
-def concat_flags(*flags):
-    return "(%s)" % "|".join(flags)
-
-
-format_flag = "PyBUF_FORMAT"
-
-memview_c_contiguous = "(PyBUF_C_CONTIGUOUS | PyBUF_FORMAT)"
-memview_f_contiguous = "(PyBUF_F_CONTIGUOUS | PyBUF_FORMAT)"
-memview_any_contiguous = "(PyBUF_ANY_CONTIGUOUS | PyBUF_FORMAT)"
-memview_full_access = "PyBUF_FULL_RO"
-#memview_strided_access = "PyBUF_STRIDED_RO"
-memview_strided_access = "PyBUF_RECORDS_RO"
-
-MEMVIEW_DIRECT = '__Pyx_MEMVIEW_DIRECT'
-MEMVIEW_PTR    = '__Pyx_MEMVIEW_PTR'
-MEMVIEW_FULL   = '__Pyx_MEMVIEW_FULL'
-MEMVIEW_CONTIG = '__Pyx_MEMVIEW_CONTIG'
-MEMVIEW_STRIDED= '__Pyx_MEMVIEW_STRIDED'
-MEMVIEW_FOLLOW = '__Pyx_MEMVIEW_FOLLOW'
-
-_spec_to_const = {
-        'direct' : MEMVIEW_DIRECT,
-        'ptr'    : MEMVIEW_PTR,
-        'full'   : MEMVIEW_FULL,
-        'contig' : MEMVIEW_CONTIG,
-        'strided': MEMVIEW_STRIDED,
-        'follow' : MEMVIEW_FOLLOW,
-        }
-
-_spec_to_abbrev = {
-    'direct'  : 'd',
-    'ptr'     : 'p',
-    'full'    : 'f',
-    'contig'  : 'c',
-    'strided' : 's',
-    'follow'  : '_',
-}
-
-memslice_entry_init = "{ 0, 0, { 0 }, { 0 }, { 0 } }"
-
-memview_name = u'memoryview'
-memview_typeptr_cname = '__pyx_memoryview_type'
-memview_objstruct_cname = '__pyx_memoryview_obj'
-memviewslice_cname = u'__Pyx_memviewslice'
-
-
-def put_init_entry(mv_cname, code):
-    code.putln("%s.data = NULL;" % mv_cname)
-    code.putln("%s.memview = NULL;" % mv_cname)
-
-
-#def axes_to_str(axes):
-#    return "".join([access[0].upper()+packing[0] for (access, packing) in axes])
-
-
-def put_acquire_memoryviewslice(lhs_cname, lhs_type, lhs_pos, rhs, code,
-                                have_gil=False, first_assignment=True):
-    "We can avoid decreffing the lhs if we know it is the first assignment"
-    assert rhs.type.is_memoryviewslice
-
-    pretty_rhs = rhs.result_in_temp() or rhs.is_simple()
-    if pretty_rhs:
-        rhstmp = rhs.result()
-    else:
-        rhstmp = code.funcstate.allocate_temp(lhs_type, manage_ref=False)
-        code.putln("%s = %s;" % (rhstmp, rhs.result_as(lhs_type)))
-
-    # Allow uninitialized assignment
-    #code.putln(code.put_error_if_unbound(lhs_pos, rhs.entry))
-    put_assign_to_memviewslice(lhs_cname, rhs, rhstmp, lhs_type, code,
-                               have_gil=have_gil, first_assignment=first_assignment)
-
-    if not pretty_rhs:
-        code.funcstate.release_temp(rhstmp)
-
-
-def put_assign_to_memviewslice(lhs_cname, rhs, rhs_cname, memviewslicetype, code,
-                               have_gil=False, first_assignment=False):
-    if not first_assignment:
-        code.put_xdecref_memoryviewslice(lhs_cname, have_gil=have_gil)
-
-    if not rhs.result_in_temp():
-        rhs.make_owned_memoryviewslice(code)
-
-    code.putln("%s = %s;" % (lhs_cname, rhs_cname))
-
-
-def get_buf_flags(specs):
-    is_c_contig, is_f_contig = is_cf_contig(specs)
-
-    if is_c_contig:
-        return memview_c_contiguous
-    elif is_f_contig:
-        return memview_f_contiguous
-
-    access, packing = zip(*specs)
-
-    if 'full' in access or 'ptr' in access:
-        return memview_full_access
-    else:
-        return memview_strided_access
-
-
-def insert_newaxes(memoryviewtype, n):
-    axes = [('direct', 'strided')] * n
-    axes.extend(memoryviewtype.axes)
-    return PyrexTypes.MemoryViewSliceType(memoryviewtype.dtype, axes)
-
-
-def broadcast_types(src, dst):
-    n = abs(src.ndim - dst.ndim)
-    if src.ndim < dst.ndim:
-        return insert_newaxes(src, n), dst
-    else:
-        return src, insert_newaxes(dst, n)
-
-
-def valid_memslice_dtype(dtype, i=0):
-    """
-    Return whether type dtype can be used as the base type of a
-    memoryview slice.
-
-    We support structs, numeric types and objects
-    """
-    if dtype.is_complex and dtype.real_type.is_int:
-        return False
-
-    if dtype is PyrexTypes.c_bint_type:
-        return False
-
-    if dtype.is_struct and dtype.kind == 'struct':
-        for member in dtype.scope.var_entries:
-            if not valid_memslice_dtype(member.type):
-                return False
-
-        return True
-
-    return (
-        dtype.is_error or
-        # Pointers are not valid (yet)
-        # (dtype.is_ptr and valid_memslice_dtype(dtype.base_type)) or
-        (dtype.is_array and i < 8 and
-         valid_memslice_dtype(dtype.base_type, i + 1)) or
-        dtype.is_numeric or
-        dtype.is_pyobject or
-        dtype.is_fused or # accept this as it will be replaced by specializations later
-        (dtype.is_typedef and valid_memslice_dtype(dtype.typedef_base_type))
-    )
-
-
-class MemoryViewSliceBufferEntry(Buffer.BufferEntry):
-    """
-    May be used during code generation time to be queried for
-    shape/strides/suboffsets attributes, or to perform indexing or slicing.
-    """
-    def __init__(self, entry):
-        self.entry = entry
-        self.type = entry.type
-        self.cname = entry.cname
-
-        self.buf_ptr = "%s.data" % self.cname
-
-        dtype = self.entry.type.dtype
-        self.buf_ptr_type = PyrexTypes.CPtrType(dtype)
-        self.init_attributes()
-
-    def get_buf_suboffsetvars(self):
-        return self._for_all_ndim("%s.suboffsets[%d]")
-
-    def get_buf_stridevars(self):
-        return self._for_all_ndim("%s.strides[%d]")
-
-    def get_buf_shapevars(self):
-        return self._for_all_ndim("%s.shape[%d]")
-
-    def generate_buffer_lookup_code(self, code, index_cnames):
-        axes = [(dim, index_cnames[dim], access, packing)
-                    for dim, (access, packing) in enumerate(self.type.axes)]
-        return self._generate_buffer_lookup_code(code, axes)
-
-    def _generate_buffer_lookup_code(self, code, axes, cast_result=True):
-        """
-        Generate a single expression that indexes the memory view slice
-        in each dimension.
-        """
-        bufp = self.buf_ptr
-        type_decl = self.type.dtype.empty_declaration_code()
-
-        for dim, index, access, packing in axes:
-            shape = "%s.shape[%d]" % (self.cname, dim)
-            stride = "%s.strides[%d]" % (self.cname, dim)
-            suboffset = "%s.suboffsets[%d]" % (self.cname, dim)
-
-            flag = get_memoryview_flag(access, packing)
-
-            if flag in ("generic", "generic_contiguous"):
-                # Note: we cannot do cast tricks to avoid stride multiplication
-                #       for generic_contiguous, as we may have to do (dtype *)
-                #       or (dtype **) arithmetic, we won't know which unless
-                #       we check suboffsets
-                code.globalstate.use_utility_code(memviewslice_index_helpers)
-                bufp = ('__pyx_memviewslice_index_full(%s, %s, %s, %s)' %
-                                            (bufp, index, stride, suboffset))
-
-            elif flag == "indirect":
-                bufp = "(%s + %s * %s)" % (bufp, index, stride)
-                bufp = ("(*((char **) %s) + %s)" % (bufp, suboffset))
-
-            elif flag == "indirect_contiguous":
-                # Note: we do char ** arithmetic
-                bufp = "(*((char **) %s + %s) + %s)" % (bufp, index, suboffset)
-
-            elif flag == "strided":
-                bufp = "(%s + %s * %s)" % (bufp, index, stride)
-
-            else:
-                assert flag == 'contiguous', flag
-                bufp = '((char *) (((%s *) %s) + %s))' % (type_decl, bufp, index)
-
-            bufp = '( /* dim=%d */ %s )' % (dim, bufp)
-
-        if cast_result:
-            return "((%s *) %s)" % (type_decl, bufp)
-
-        return bufp
-
-    def generate_buffer_slice_code(self, code, indices, dst, have_gil,
-                                   have_slices, directives):
-        """
-        Slice a memoryviewslice.
-
-        indices     - list of index nodes. If not a SliceNode, or NoneNode,
-                      then it must be coercible to Py_ssize_t
-
-        Simply call __pyx_memoryview_slice_memviewslice with the right
-        arguments, unless the dimension is omitted or a bare ':', in which
-        case we copy over the shape/strides/suboffsets attributes directly
-        for that dimension.
-        """
-        src = self.cname
-
-        code.putln("%(dst)s.data = %(src)s.data;" % locals())
-        code.putln("%(dst)s.memview = %(src)s.memview;" % locals())
-        code.put_incref_memoryviewslice(dst)
-
-        all_dimensions_direct = all(access == 'direct' for access, packing in self.type.axes)
-        suboffset_dim_temp = []
-
-        def get_suboffset_dim():
-            # create global temp variable at request
-            if not suboffset_dim_temp:
-                suboffset_dim = code.funcstate.allocate_temp(PyrexTypes.c_int_type, manage_ref=False)
-                code.putln("%s = -1;" % suboffset_dim)
-                suboffset_dim_temp.append(suboffset_dim)
-            return suboffset_dim_temp[0]
-
-        dim = -1
-        new_ndim = 0
-        for index in indices:
-            if index.is_none:
-                # newaxis
-                for attrib, value in [('shape', 1), ('strides', 0), ('suboffsets', -1)]:
-                    code.putln("%s.%s[%d] = %d;" % (dst, attrib, new_ndim, value))
-
-                new_ndim += 1
-                continue
-
-            dim += 1
-            access, packing = self.type.axes[dim]
-
-            if isinstance(index, ExprNodes.SliceNode):
-                # slice, unspecified dimension, or part of ellipsis
-                d = dict(locals())
-                for s in "start stop step".split():
-                    idx = getattr(index, s)
-                    have_idx = d['have_' + s] = not idx.is_none
-                    d[s] = idx.result() if have_idx else "0"
-
-                if not (d['have_start'] or d['have_stop'] or d['have_step']):
-                    # full slice (:), simply copy over the extent, stride
-                    # and suboffset. Also update suboffset_dim if needed
-                    d['access'] = access
-                    util_name = "SimpleSlice"
-                else:
-                    util_name = "ToughSlice"
-                    d['error_goto'] = code.error_goto(index.pos)
-
-                new_ndim += 1
-            else:
-                # normal index
-                idx = index.result()
-
-                indirect = access != 'direct'
-                if indirect:
-                    generic = access == 'full'
-                    if new_ndim != 0:
-                        return error(index.pos,
-                                     "All preceding dimensions must be "
-                                     "indexed and not sliced")
-
-                d = dict(
-                    locals(),
-                    wraparound=int(directives['wraparound']),
-                    boundscheck=int(directives['boundscheck']),
-                )
-                if d['boundscheck']:
-                    d['error_goto'] = code.error_goto(index.pos)
-                util_name = "SliceIndex"
-
-            _, impl = TempitaUtilityCode.load_as_string(util_name, "MemoryView_C.c", context=d)
-            code.put(impl)
-
-        if suboffset_dim_temp:
-            code.funcstate.release_temp(suboffset_dim_temp[0])
-
-
-def empty_slice(pos):
-    none = ExprNodes.NoneNode(pos)
-    return ExprNodes.SliceNode(pos, start=none,
-                               stop=none, step=none)
-
-
-def unellipsify(indices, ndim):
-    result = []
-    seen_ellipsis = False
-    have_slices = False
-
-    newaxes = [newaxis for newaxis in indices if newaxis.is_none]
-    n_indices = len(indices) - len(newaxes)
-
-    for index in indices:
-        if isinstance(index, ExprNodes.EllipsisNode):
-            have_slices = True
-            full_slice = empty_slice(index.pos)
-
-            if seen_ellipsis:
-                result.append(full_slice)
-            else:
-                nslices = ndim - n_indices + 1
-                result.extend([full_slice] * nslices)
-                seen_ellipsis = True
-        else:
-            have_slices = have_slices or index.is_slice or index.is_none
-            result.append(index)
-
-    result_length = len(result) - len(newaxes)
-    if result_length < ndim:
-        have_slices = True
-        nslices = ndim - result_length
-        result.extend([empty_slice(indices[-1].pos)] * nslices)
-
-    return have_slices, result, newaxes
-
-
-def get_memoryview_flag(access, packing):
-    if access == 'full' and packing in ('strided', 'follow'):
-        return 'generic'
-    elif access == 'full' and packing == 'contig':
-        return 'generic_contiguous'
-    elif access == 'ptr' and packing in ('strided', 'follow'):
-        return 'indirect'
-    elif access == 'ptr' and packing == 'contig':
-        return 'indirect_contiguous'
-    elif access == 'direct' and packing in ('strided', 'follow'):
-        return 'strided'
-    else:
-        assert (access, packing) == ('direct', 'contig'), (access, packing)
-        return 'contiguous'
-
-
-def get_is_contig_func_name(contig_type, ndim):
-    assert contig_type in ('C', 'F')
-    return "__pyx_memviewslice_is_contig_%s%d" % (contig_type, ndim)
-
-
-def get_is_contig_utility(contig_type, ndim):
-    assert contig_type in ('C', 'F')
-    C = dict(context, ndim=ndim, contig_type=contig_type)
-    utility = load_memview_c_utility("MemviewSliceCheckContig", C, requires=[is_contig_utility])
-    return utility
-
-
-def slice_iter(slice_type, slice_result, ndim, code):
-    if slice_type.is_c_contig or slice_type.is_f_contig:
-        return ContigSliceIter(slice_type, slice_result, ndim, code)
-    else:
-        return StridedSliceIter(slice_type, slice_result, ndim, code)
-
-
-class SliceIter(object):
-    def __init__(self, slice_type, slice_result, ndim, code):
-        self.slice_type = slice_type
-        self.slice_result = slice_result
-        self.code = code
-        self.ndim = ndim
-
-
-class ContigSliceIter(SliceIter):
-    def start_loops(self):
-        code = self.code
-        code.begin_block()
-
-        type_decl = self.slice_type.dtype.empty_declaration_code()
-
-        total_size = ' * '.join("%s.shape[%d]" % (self.slice_result, i)
-                                for i in range(self.ndim))
-        code.putln("Py_ssize_t __pyx_temp_extent = %s;" % total_size)
-        code.putln("Py_ssize_t __pyx_temp_idx;")
-        code.putln("%s *__pyx_temp_pointer = (%s *) %s.data;" % (
-            type_decl, type_decl, self.slice_result))
-        code.putln("for (__pyx_temp_idx = 0; "
-                        "__pyx_temp_idx < __pyx_temp_extent; "
-                        "__pyx_temp_idx++) {")
-
-        return "__pyx_temp_pointer"
-
-    def end_loops(self):
-        self.code.putln("__pyx_temp_pointer += 1;")
-        self.code.putln("}")
-        self.code.end_block()
-
-
-class StridedSliceIter(SliceIter):
-    def start_loops(self):
-        code = self.code
-        code.begin_block()
-
-        for i in range(self.ndim):
-            t = i, self.slice_result, i
-            code.putln("Py_ssize_t __pyx_temp_extent_%d = %s.shape[%d];" % t)
-            code.putln("Py_ssize_t __pyx_temp_stride_%d = %s.strides[%d];" % t)
-            code.putln("char *__pyx_temp_pointer_%d;" % i)
-            code.putln("Py_ssize_t __pyx_temp_idx_%d;" % i)
-
-        code.putln("__pyx_temp_pointer_0 = %s.data;" % self.slice_result)
-
-        for i in range(self.ndim):
-            if i > 0:
-                code.putln("__pyx_temp_pointer_%d = __pyx_temp_pointer_%d;" % (i, i - 1))
-
-            code.putln("for (__pyx_temp_idx_%d = 0; "
-                            "__pyx_temp_idx_%d < __pyx_temp_extent_%d; "
-                            "__pyx_temp_idx_%d++) {" % (i, i, i, i))
-
-        return "__pyx_temp_pointer_%d" % (self.ndim - 1)
-
-    def end_loops(self):
-        code = self.code
-        for i in range(self.ndim - 1, -1, -1):
-            code.putln("__pyx_temp_pointer_%d += __pyx_temp_stride_%d;" % (i, i))
-            code.putln("}")
-
-        code.end_block()
-
-
-def copy_c_or_fortran_cname(memview):
-    if memview.is_c_contig:
-        c_or_f = 'c'
-    else:
-        c_or_f = 'f'
-
-    return "__pyx_memoryview_copy_slice_%s_%s" % (
-            memview.specialization_suffix(), c_or_f)
-
-
-def get_copy_new_utility(pos, from_memview, to_memview):
-    if (from_memview.dtype != to_memview.dtype and
-            not (from_memview.dtype.is_const and from_memview.dtype.const_base_type == to_memview.dtype)):
-        error(pos, "dtypes must be the same!")
-        return
-    if len(from_memview.axes) != len(to_memview.axes):
-        error(pos, "number of dimensions must be same")
-        return
-    if not (to_memview.is_c_contig or to_memview.is_f_contig):
-        error(pos, "to_memview must be c or f contiguous.")
-        return
-
-    for (access, packing) in from_memview.axes:
-        if access != 'direct':
-            error(pos, "cannot handle 'full' or 'ptr' access at this time.")
-            return
-
-    if to_memview.is_c_contig:
-        mode = 'c'
-        contig_flag = memview_c_contiguous
-    elif to_memview.is_f_contig:
-        mode = 'fortran'
-        contig_flag = memview_f_contiguous
-
-    return load_memview_c_utility(
-        "CopyContentsUtility",
-        context=dict(
-            context,
-            mode=mode,
-            dtype_decl=to_memview.dtype.empty_declaration_code(),
-            contig_flag=contig_flag,
-            ndim=to_memview.ndim,
-            func_cname=copy_c_or_fortran_cname(to_memview),
-            dtype_is_object=int(to_memview.dtype.is_pyobject)),
-        requires=[copy_contents_new_utility])
-
-
-def get_axes_specs(env, axes):
-    '''
-    get_axes_specs(env, axes) -> list of (access, packing) specs for each axis.
-    access is one of 'full', 'ptr' or 'direct'
-    packing is one of 'contig', 'strided' or 'follow'
-    '''
-
-    cythonscope = env.global_scope().context.cython_scope
-    cythonscope.load_cythonscope()
-    viewscope = cythonscope.viewscope
-
-    access_specs = tuple([viewscope.lookup(name)
-                    for name in ('full', 'direct', 'ptr')])
-    packing_specs = tuple([viewscope.lookup(name)
-                    for name in ('contig', 'strided', 'follow')])
-
-    is_f_contig, is_c_contig = False, False
-    default_access, default_packing = 'direct', 'strided'
-    cf_access, cf_packing = default_access, 'follow'
-
-    axes_specs = []
-    # analyse all axes.
-    for idx, axis in enumerate(axes):
-        if not axis.start.is_none:
-            raise CompileError(axis.start.pos,  START_ERR)
-
-        if not axis.stop.is_none:
-            raise CompileError(axis.stop.pos, STOP_ERR)
-
-        if axis.step.is_none:
-            axes_specs.append((default_access, default_packing))
-
-        elif isinstance(axis.step, IntNode):
-            # the packing for the ::1 axis is contiguous,
-            # all others are cf_packing.
-            if axis.step.compile_time_value(env) != 1:
-                raise CompileError(axis.step.pos, STEP_ERR)
-
-            axes_specs.append((cf_access, 'cfcontig'))
-
-        elif isinstance(axis.step, (NameNode, AttributeNode)):
-            entry = _get_resolved_spec(env, axis.step)
-            if entry.name in view_constant_to_access_packing:
-                axes_specs.append(view_constant_to_access_packing[entry.name])
-            else:
-                raise CompileError(axis.step.pos, INVALID_ERR)
-
-        else:
-            raise CompileError(axis.step.pos, INVALID_ERR)
-
-    # First, find out if we have a ::1 somewhere
-    contig_dim = 0
-    is_contig = False
-    for idx, (access, packing) in enumerate(axes_specs):
-        if packing == 'cfcontig':
-            if is_contig:
-                raise CompileError(axis.step.pos, BOTH_CF_ERR)
-
-            contig_dim = idx
-            axes_specs[idx] = (access, 'contig')
-            is_contig = True
-
-    if is_contig:
-        # We have a ::1 somewhere, see if we're C or Fortran contiguous
-        if contig_dim == len(axes) - 1:
-            is_c_contig = True
-        else:
-            is_f_contig = True
-
-            if contig_dim and not axes_specs[contig_dim - 1][0] in ('full', 'ptr'):
-                raise CompileError(axes[contig_dim].pos,
-                                   "Fortran contiguous specifier must follow an indirect dimension")
-
-        if is_c_contig:
-            # Contiguous in the last dimension, find the last indirect dimension
-            contig_dim = -1
-            for idx, (access, packing) in enumerate(reversed(axes_specs)):
-                if access in ('ptr', 'full'):
-                    contig_dim = len(axes) - idx - 1
-
-        # Replace 'strided' with 'follow' for any dimension following the last
-        # indirect dimension, the first dimension or the dimension following
-        # the ::1.
-        #               int[::indirect, ::1, :, :]
-        #                                    ^  ^
-        #               int[::indirect, :, :, ::1]
-        #                               ^  ^
-        start = contig_dim + 1
-        stop = len(axes) - is_c_contig
-        for idx, (access, packing) in enumerate(axes_specs[start:stop]):
-            idx = contig_dim + 1 + idx
-            if access != 'direct':
-                raise CompileError(axes[idx].pos,
-                                   "Indirect dimension may not follow "
-                                   "Fortran contiguous dimension")
-            if packing == 'contig':
-                raise CompileError(axes[idx].pos,
-                                   "Dimension may not be contiguous")
-            axes_specs[idx] = (access, cf_packing)
-
-        if is_c_contig:
-            # For C contiguity, we need to fix the 'contig' dimension
-            # after the loop
-            a, p = axes_specs[-1]
-            axes_specs[-1] = a, 'contig'
-
-    validate_axes_specs([axis.start.pos for axis in axes],
-                        axes_specs,
-                        is_c_contig,
-                        is_f_contig)
-
-    return axes_specs
-
-
-def validate_axes(pos, axes):
-    if len(axes) >= Options.buffer_max_dims:
-        error(pos, "More dimensions than the maximum number"
-                   " of buffer dimensions were used.")
-        return False
-
-    return True
-
-
-def is_cf_contig(specs):
-    is_c_contig = is_f_contig = False
-
-    if len(specs) == 1 and specs == [('direct', 'contig')]:
-        is_c_contig = True
-
-    elif (specs[-1] == ('direct','contig') and
-          all(axis == ('direct','follow') for axis in specs[:-1])):
-        # c_contiguous: 'follow', 'follow', ..., 'follow', 'contig'
-        is_c_contig = True
-
-    elif (len(specs) > 1 and
-        specs[0] == ('direct','contig') and
-        all(axis == ('direct','follow') for axis in specs[1:])):
-        # f_contiguous: 'contig', 'follow', 'follow', ..., 'follow'
-        is_f_contig = True
-
-    return is_c_contig, is_f_contig
-
-
-def get_mode(specs):
-    is_c_contig, is_f_contig = is_cf_contig(specs)
-
-    if is_c_contig:
-        return 'c'
-    elif is_f_contig:
-        return 'fortran'
-
-    for access, packing in specs:
-        if access in ('ptr', 'full'):
-            return 'full'
-
-    return 'strided'
-
-view_constant_to_access_packing = {
-    'generic':              ('full',   'strided'),
-    'strided':              ('direct', 'strided'),
-    'indirect':             ('ptr',    'strided'),
-    'generic_contiguous':   ('full',   'contig'),
-    'contiguous':           ('direct', 'contig'),
-    'indirect_contiguous':  ('ptr',    'contig'),
-}
-
-def validate_axes_specs(positions, specs, is_c_contig, is_f_contig):
-
-    packing_specs = ('contig', 'strided', 'follow')
-    access_specs = ('direct', 'ptr', 'full')
-
-    # is_c_contig, is_f_contig = is_cf_contig(specs)
-
-    has_contig = has_follow = has_strided = has_generic_contig = False
-
-    last_indirect_dimension = -1
-    for idx, (access, packing) in enumerate(specs):
-        if access == 'ptr':
-            last_indirect_dimension = idx
-
-    for idx, (pos, (access, packing)) in enumerate(zip(positions, specs)):
-
-        if not (access in access_specs and
-                packing in packing_specs):
-            raise CompileError(pos, "Invalid axes specification.")
-
-        if packing == 'strided':
-            has_strided = True
-        elif packing == 'contig':
-            if has_contig:
-                raise CompileError(pos, "Only one direct contiguous "
-                                        "axis may be specified.")
-
-            valid_contig_dims = last_indirect_dimension + 1, len(specs) - 1
-            if idx not in valid_contig_dims and access != 'ptr':
-                if last_indirect_dimension + 1 != len(specs) - 1:
-                    dims = "dimensions %d and %d" % valid_contig_dims
-                else:
-                    dims = "dimension %d" % valid_contig_dims[0]
-
-                raise CompileError(pos, "Only %s may be contiguous and direct" % dims)
-
-            has_contig = access != 'ptr'
-        elif packing == 'follow':
-            if has_strided:
-                raise CompileError(pos, "A memoryview cannot have both follow and strided axis specifiers.")
-            if not (is_c_contig or is_f_contig):
-                raise CompileError(pos, "Invalid use of the follow specifier.")
-
-        if access in ('ptr', 'full'):
-            has_strided = False
-
-def _get_resolved_spec(env, spec):
-    # spec must be a NameNode or an AttributeNode
-    if isinstance(spec, NameNode):
-        return _resolve_NameNode(env, spec)
-    elif isinstance(spec, AttributeNode):
-        return _resolve_AttributeNode(env, spec)
-    else:
-        raise CompileError(spec.pos, INVALID_ERR)
-
-def _resolve_NameNode(env, node):
-    try:
-        resolved_name = env.lookup(node.name).name
-    except AttributeError:
-        raise CompileError(node.pos, INVALID_ERR)
-
-    viewscope = env.global_scope().context.cython_scope.viewscope
-    entry = viewscope.lookup(resolved_name)
-    if entry is None:
-        raise CompileError(node.pos, NOT_CIMPORTED_ERR)
-
-    return entry
-
-def _resolve_AttributeNode(env, node):
-    path = []
-    while isinstance(node, AttributeNode):
-        path.insert(0, node.attribute)
-        node = node.obj
-    if isinstance(node, NameNode):
-        path.insert(0, node.name)
-    else:
-        raise CompileError(node.pos, EXPR_ERR)
-    modnames = path[:-1]
-    # must be at least 1 module name, o/w not an AttributeNode.
-    assert modnames
-
-    scope = env
-    for modname in modnames:
-        mod = scope.lookup(modname)
-        if not mod or not mod.as_module:
-            raise CompileError(
-                    node.pos, "undeclared name not builtin: %s" % modname)
-        scope = mod.as_module
-
-    entry = scope.lookup(path[-1])
-    if not entry:
-        raise CompileError(node.pos, "No such attribute '%s'" % path[-1])
-
-    return entry
-
-#
-### Utility loading
-#
-
-def load_memview_cy_utility(util_code_name, context=None, **kwargs):
-    return CythonUtilityCode.load(util_code_name, "MemoryView.pyx",
-                                  context=context, **kwargs)
-
-def load_memview_c_utility(util_code_name, context=None, **kwargs):
-    if context is None:
-        return UtilityCode.load(util_code_name, "MemoryView_C.c", **kwargs)
-    else:
-        return TempitaUtilityCode.load(util_code_name, "MemoryView_C.c",
-                                       context=context, **kwargs)
-
-def use_cython_array_utility_code(env):
-    cython_scope = env.global_scope().context.cython_scope
-    cython_scope.load_cythonscope()
-    cython_scope.viewscope.lookup('array_cwrapper').used = True
-
-context = {
-    'memview_struct_name': memview_objstruct_cname,
-    'max_dims': Options.buffer_max_dims,
-    'memviewslice_name': memviewslice_cname,
-    'memslice_init': memslice_entry_init,
-}
-memviewslice_declare_code = load_memview_c_utility(
-        "MemviewSliceStruct",
-        context=context,
-        requires=[])
-
-atomic_utility = load_memview_c_utility("Atomics", context)
-
-memviewslice_init_code = load_memview_c_utility(
-    "MemviewSliceInit",
-    context=dict(context, BUF_MAX_NDIMS=Options.buffer_max_dims),
-    requires=[memviewslice_declare_code,
-              atomic_utility],
-)
-
-memviewslice_index_helpers = load_memview_c_utility("MemviewSliceIndex")
-
-typeinfo_to_format_code = load_memview_cy_utility(
-        "BufferFormatFromTypeInfo", requires=[Buffer._typeinfo_to_format_code])
-
-is_contig_utility = load_memview_c_utility("MemviewSliceIsContig", context)
-overlapping_utility = load_memview_c_utility("OverlappingSlices", context)
-copy_contents_new_utility = load_memview_c_utility(
-    "MemviewSliceCopyTemplate",
-    context,
-    requires=[], # require cython_array_utility_code
-)
-
-view_utility_code = load_memview_cy_utility(
-        "View.MemoryView",
-        context=context,
-        requires=[Buffer.GetAndReleaseBufferUtilityCode(),
-                  Buffer.buffer_struct_declare_code,
-                  Buffer.buffer_formats_declare_code,
-                  memviewslice_init_code,
-                  is_contig_utility,
-                  overlapping_utility,
-                  copy_contents_new_utility,
-                  ModuleNode.capsule_utility_code],
-)
-view_utility_whitelist = ('array', 'memoryview', 'array_cwrapper',
-                          'generic', 'strided', 'indirect', 'contiguous',
-                          'indirect_contiguous')
-
-memviewslice_declare_code.requires.append(view_utility_code)
-copy_contents_new_utility.requires.append(view_utility_code)