MAINT: Make take_1d accept readonly buffers.

This is a straightforward port of GH#10070 to 1d arrays.

Author: Joris Vankerschaver

doc/source/whatsnew/v0.18.0.txt

@@ -508,3 +508,5 @@ Bug Fixes
 
 - Removed ``millisecond`` property of ``DatetimeIndex``. This would always raise
   a ``ValueError`` (:issue:`12019`).
+
+- Bug in Series constructor with read-only data (:issue:`11502`)

pandas/src/generate_code.py

@@ -88,13 +88,7 @@
 """
 
 
-take_1d_template = """
-@cython.wraparound(False)
-@cython.boundscheck(False)
-def take_1d_%(name)s_%(dest)s(%(c_type_in)s[:] values,
-                              int64_t[:] indexer,
-                              %(c_type_out)s[:] out,
-                              fill_value=np.nan):
+inner_take_1d_template = """\
     cdef:
         Py_ssize_t i, n, idx
         %(c_type_out)s fv
@@ -112,6 +106,33 @@ def take_1d_%(name)s_%(dest)s(%(c_type_in)s[:] values,
     %(tab)s        out[i] = %(preval)svalues[idx]%(postval)s
 """
 
+take_1d_template = """\
+@cython.wraparound(False)
+@cython.boundscheck(False)
+cdef inline take_1d_%(name)s_%(dest)s_memview(%(c_type_in)s[:] values,
+                      int64_t[:] indexer,
+                      %(c_type_out)s[:] out,
+                      fill_value=np.nan):
+""" + inner_take_1d_template + """
+
+@cython.wraparound(False)
+@cython.boundscheck(False)
+def take_1d_%(name)s_%(dest)s(ndarray[%(c_type_in)s, ndim=1] values,
+                              int64_t[:] indexer,
+                              %(c_type_out)s[:] out,
+                              fill_value=np.nan):
+
+    if values.flags.writeable:
+        # We can call the memoryview version of the code
+        take_1d_%(name)s_%(dest)s_memview(values, indexer, out,
+                                          fill_value=fill_value)
+        return
+
+    # We cannot use the memoryview version on readonly-buffers due to
+    # a limitation of Cython's typed memoryviews. Instead we can use
+    # the slightly slower Cython ndarray type directly.
+""" + inner_take_1d_template
+
 inner_take_2d_axis0_template = """\
     cdef:
         Py_ssize_t i, j, k, n, idx