diff --git a/arraycontext/__init__.py b/arraycontext/__init__.py
index f94fb819471920db846e3530f5e22b820538dbe9..e5ae4a01d680396a0f25abc8329d247c039a3898 100644
--- a/arraycontext/__init__.py
+++ b/arraycontext/__init__.py
@@ -28,9 +28,14 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
"""
+import sys
from .context import ArrayContext
-from .metadata import CommonSubexpressionTag, FirstAxisIsElementsTag
+from .transform_metadata import (CommonSubexpressionTag,
+ ElementwiseMapKernelTag)
+
+# deprecated, remove in 2022.
+from .metadata import _FirstAxisIsElementsTag
from .container import (
ArrayContainer,
@@ -64,7 +69,7 @@ __all__ = (
"ArrayContext",
"CommonSubexpressionTag",
- "FirstAxisIsElementsTag",
+ "ElementwiseMapKernelTag",
"ArrayContainer",
"is_array_container", "is_array_container_type",
@@ -90,7 +95,9 @@ __all__ = (
)
-def _acf():
+# {{{ deprecation handling
+
+def _deprecated_acf():
"""A tiny undocumented function to pass to tests that take an ``actx_factory``
argument when running them from the command line.
"""
@@ -100,4 +107,32 @@ def _acf():
queue = cl.CommandQueue(context)
return PyOpenCLArrayContext(queue)
+
+_depr_name_to_replacement_and_obj = {
+ "FirstAxisIsElementsTag":
+ ("meshmode.transform_metadata.FirstAxisIsElementsTag",
+ _FirstAxisIsElementsTag),
+ "_acf":
+ ("<no replacement yet>", _deprecated_acf),
+ }
+
+if sys.version_info >= (3, 7):
+ def __getattr__(name):
+ replacement_and_obj = _depr_name_to_replacement_and_obj.get(name, None)
+ if replacement_and_obj is not None:
+ replacement, obj = replacement_and_obj
+ from warnings import warn
+ warn(f"'arraycontext.{name}' is deprecated. "
+ f"Use '{replacement}' instead. "
+ f"'arraycontext.{name}' will continue to work until 2022.",
+ DeprecationWarning, stacklevel=2)
+ return obj
+ else:
+ raise AttributeError(name)
+else:
+ FirstAxisIsElementsTag = _FirstAxisIsElementsTag
+ _acf = _deprecated_acf
+
+# }}}
+
# vim: foldmethod=marker
diff --git a/arraycontext/impl/pyopencl/__init__.py b/arraycontext/impl/pyopencl/__init__.py
index ca377325fe9097bc26f73cfd0232317a10478db2..b29fd3380332d5403564f11a74ce8e630ebc92f0 100644
--- a/arraycontext/impl/pyopencl/__init__.py
+++ b/arraycontext/impl/pyopencl/__init__.py
@@ -34,7 +34,6 @@ import numpy as np
from pytools.tag import Tag
-from arraycontext.metadata import FirstAxisIsElementsTag
from arraycontext.context import ArrayContext
@@ -223,9 +222,13 @@ class PyOpenCLArrayContext(ArrayContext):
all_inames = default_entrypoint.all_inames()
# FIXME: This could be much smarter.
inner_iname = None
+
+ # import with underscore to avoid DeprecationWarning
+ from arraycontext.metadata import _FirstAxisIsElementsTag
+
if (len(default_entrypoint.instructions) == 1
and isinstance(default_entrypoint.instructions[0], lp.Assignment)
- and any(isinstance(tag, FirstAxisIsElementsTag)
+ and any(isinstance(tag, _FirstAxisIsElementsTag)
# FIXME: Firedrake branch lacks kernel tags
for tag in getattr(default_entrypoint, "tags", ()))):
stmt, = default_entrypoint.instructions
diff --git a/arraycontext/metadata.py b/arraycontext/metadata.py
index 1713cd1b4f1fc944867cefca0ef13f8afda711e5..6291a86504563c64faf63be79467784ff65a6cfa 100644
--- a/arraycontext/metadata.py
+++ b/arraycontext/metadata.py
@@ -1,8 +1,3 @@
-"""
-.. autoclass:: CommonSubexpressionTag
-.. autoclass:: FirstAxisIsElementsTag
-"""
-
__copyright__ = """
Copyright (C) 2020-1 University of Illinois Board of Trustees
"""
@@ -27,24 +22,34 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
"""
+import sys
from pytools.tag import Tag
-
-
-# {{{ program metadata
-
-class CommonSubexpressionTag(Tag):
- """A tag that is applicable to arrays indicating that this same array
- may be evaluated multiple times, and that the implementation should
- eliminate those redundant evaluations if possible.
- """
-
-
-class FirstAxisIsElementsTag(Tag):
- """A tag that is applicable to array outputs indicating that the
- first index corresponds to element indices. This suggests that
- the implementation should set element indices as the outermost
- loop extent.
- """
+from warnings import warn
+
+
+# {{{ deprecation handling
+
+try:
+ from meshmode.transform_metadata import FirstAxisIsElementsTag \
+ as _FirstAxisIsElementsTag
+except ImportError:
+ # placeholder in case meshmode is too old to have it.
+ class _FirstAxisIsElementsTag(Tag): # type: ignore[no-redef]
+ pass
+
+
+if sys.version_info >= (3, 7):
+ def __getattr__(name):
+ if name == "FirstAxisIsElementsTag":
+ warn(f"'arraycontext.{name}' is deprecated. "
+ f"Use 'meshmode.transform_metadata.{name}' instead. "
+ f"'arraycontext.{name}' will continue to work until 2022.",
+ DeprecationWarning, stacklevel=2)
+ return _FirstAxisIsElementsTag
+ else:
+ raise AttributeError(name)
+else:
+ FirstAxisIsElementsTag = _FirstAxisIsElementsTag
# }}}
diff --git a/arraycontext/transform_metadata.py b/arraycontext/transform_metadata.py
new file mode 100644
index 0000000000000000000000000000000000000000..2e0942e95c674434af03ed3bff363aa26433d36c
--- /dev/null
+++ b/arraycontext/transform_metadata.py
@@ -0,0 +1,59 @@
+"""
+.. currentmodule:: arraycontext
+
+.. autoclass:: CommonSubexpressionTag
+.. autoclass:: ElementwiseMapKernelTag
+"""
+
+__copyright__ = """
+Copyright (C) 2020-1 University of Illinois Board of Trustees
+"""
+
+__license__ = """
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+"""
+
+from pytools.tag import Tag
+
+
+# {{{ program metadata
+
+class CommonSubexpressionTag(Tag):
+ """A tag that is applicable to arrays indicating that this same array
+ may be evaluated multiple times, and that the implementation should
+ eliminate those redundant evaluations if possible.
+ """
+
+
+class ElementwiseMapKernelTag(Tag):
+ """A tag that applies to :class:`loopy.LoopKernel` indicating that the kernel
+ is a "map", i.e. that the output array(s) has/have the same shape as the
+ input array(s), and that each output element only depends on its corresponding
+ element(s) in the input array(s).
+
+ .. note::
+
+ "Element" here refers to a scalar element of an array, not an element
+ in a finite-element discretization.
+ """
+
+# }}}
+
+
+# vim: foldmethod=marker