compat: suppress deprecation warnings that are internal or during test.

nmigen/compat/genlib/fsm.py

@@ -1,6 +1,6 @@
-import warnings
 from collections import OrderedDict
 
+from ...tools import _ignore_deprecated
 from ...hdl.xfrm import ValueTransformer, StatementTransformer
 from ...hdl.ast import *
 from ..fhdl.module import CompatModule, CompatFinalizeError
@@ -153,6 +153,7 @@ class FSM(CompatModule):
         self.sync += signal.eq(self.before_leaving(state))
         return signal
 
+    @_ignore_deprecated
     def do_finalize(self):
         nstates = len(self.actions)
         self.encoding = dict((s, n) for n, s in enumerate(self.actions.keys()))
@@ -178,7 +179,6 @@ class FSM(CompatModule):
 
     def _finalize_sync(self, ls):
         cases = dict((self.encoding[k], ls.on_statement(v)) for k, v in self.actions.items() if v)
-        with warnings.catch_warnings():
         self.comb += [
             self.next_state.eq(self.state),
             Case(self.state, cases).makedefault(self.encoding[self.reset_state])

nmigen/test/compat/support.py

@@ -1,9 +1,11 @@
+from ...tools import _ignore_deprecated
 from ...compat import *
 from ...compat.fhdl import verilog
 
 
 class SimCase:
     def setUp(self, *args, **kwargs):
+        with _ignore_deprecated():
             self.tb = self.TestBench(*args, **kwargs)
 
     def test_to_verilog(self):

nmigen/tools.py

@@ -1,6 +1,8 @@
-from collections.abc import Iterable
+import contextlib
 import functools
 import warnings
+from collections.abc import Iterable
+from contextlib import contextmanager
 
 
 __all__ = ["flatten", "union", "log2_int", "bits_for", "deprecated"]
@@ -54,6 +56,23 @@ def deprecated(message, stacklevel=2):
     return decorator
 
 
+def _ignore_deprecated(f=None):
+    if f is None:
+        @contextlib.contextmanager
+        def context_like():
+            with warnings.catch_warnings():
+                warnings.filterwarnings(action="ignore", category=DeprecationWarning)
+                yield
+        return context_like()
+    else:
+        @functools.wraps(f)
+        def decorator_like(*args, **kwargs):
+            with warnings.catch_warnings():
+                warnings.filterwarnings(action="ignore", category=DeprecationWarning)
+                f(*args, **kwargs)
+        return decorator_like
+
+
 def extend(cls):
     def decorator(f):
         if isinstance(f, property):