From: whitequark <cz@m-labs.hk>
Date: Sat, 15 Dec 2018 09:19:26 +0000 (+0000)
Subject: fhdl.ir: fix incorrect uses of positive to say non-negative.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=b4764f8b2f475b549a01c6d855f3ffd44dcd5305;p=nmigen.git

fhdl.ir: fix incorrect uses of positive to say non-negative.

Also test Part and Slice properly.
---

diff --git a/nmigen/fhdl/ast.py b/nmigen/fhdl/ast.py
index 37bcba3..1908a0e 100644
--- a/nmigen/fhdl/ast.py
+++ b/nmigen/fhdl/ast.py
@@ -236,7 +236,7 @@ class Const(Value):
             shape = shape, self.value < 0
         self.nbits, self.signed = shape
         if not isinstance(self.nbits, int) or self.nbits < 0:
-            raise TypeError("Width must be a positive integer")
+            raise TypeError("Width must be a non-negative integer")
         self.value = self.normalize(self.value, shape)
 
     def shape(self):
@@ -313,7 +313,7 @@ class Operator(Value):
             return obs[0]
         elif self.op == "m":
             return self._bitwise_binary_shape(obs[1], obs[2])
-        raise NotImplementedError("Operator '{!r}' not implemented".format(self.op)) # :nocov:
+        raise NotImplementedError("Operator '{}' not implemented".format(self.op)) # :nocov:
 
     def _rhs_signals(self):
         return union(op._rhs_signals() for op in self.operands)
@@ -344,9 +344,9 @@ def Mux(sel, val1, val0):
 class Slice(Value):
     def __init__(self, value, start, end):
         if not isinstance(start, int):
-            raise TypeError("Slice start must be integer, not {!r}".format(start))
+            raise TypeError("Slice start must be an integer, not {!r}".format(start))
         if not isinstance(end, int):
-            raise TypeError("Slice end must be integer, not {!r}".format(end))
+            raise TypeError("Slice end must be an integer, not {!r}".format(end))
 
         n = len(value)
         if start not in range(-n, n):
@@ -381,7 +381,7 @@ class Slice(Value):
 class Part(Value):
     def __init__(self, value, offset, width):
         if not isinstance(width, int) or width < 0:
-            raise TypeError("Part width must be a positive integer, not {!r}".format(width))
+            raise TypeError("Part width must be a non-negative integer, not {!r}".format(width))
 
         super().__init__()
         self.value  = value
@@ -398,7 +398,7 @@ class Part(Value):
         return self.value._rhs_signals()
 
     def __repr__(self):
-        return "(part {} {})".format(repr(self.value), repr(self.offset), self.width)
+        return "(part {} {} {})".format(repr(self.value), repr(self.offset), self.width)
 
 
 class Cat(Value):
@@ -464,7 +464,8 @@ class Repl(Value):
     """
     def __init__(self, value, count):
         if not isinstance(count, int) or count < 0:
-            raise TypeError("Replication count must be a positive integer, not {!r}".format(count))
+            raise TypeError("Replication count must be a non-negative integer, not {!r}"
+                            .format(count))
 
         super().__init__()
         self.value = Value.wrap(value)
@@ -557,7 +558,7 @@ class Signal(Value, DUID):
                 self.nbits, self.signed = shape
 
         if not isinstance(self.nbits, int) or self.nbits < 0:
-            raise TypeError("Width must be a positive integer, not {!r}".format(self.nbits))
+            raise TypeError("Width must be a non-negative integer, not {!r}".format(self.nbits))
         self.reset = int(reset)
         self.reset_less = bool(reset_less)
 
diff --git a/nmigen/test/test_fhdl_ast.py b/nmigen/test/test_fhdl_ast.py
new file mode 100644
index 0000000..66ddec7
--- /dev/null
+++ b/nmigen/test/test_fhdl_ast.py
@@ -0,0 +1,417 @@
+from ..fhdl.ast import *
+from .tools import *
+
+
+class ValueTestCase(FHDLTestCase):
+    def test_wrap(self):
+        self.assertIsInstance(Value.wrap(0), Const)
+        self.assertIsInstance(Value.wrap(True), Const)
+        c = Const(0)
+        self.assertIs(Value.wrap(c), c)
+        with self.assertRaises(TypeError):
+            Value.wrap("str")
+
+    def test_bool(self):
+        with self.assertRaises(TypeError):
+            if Const(0):
+                pass
+
+    def test_len(self):
+        self.assertEqual(len(Const(10)), 4)
+
+    def test_getitem_int(self):
+        s1 = Const(10)[0]
+        self.assertIsInstance(s1, Slice)
+        self.assertEqual(s1.start, 0)
+        self.assertEqual(s1.end, 1)
+        s2 = Const(10)[-1]
+        self.assertIsInstance(s2, Slice)
+        self.assertEqual(s2.start, 3)
+        self.assertEqual(s2.end, 4)
+        with self.assertRaises(IndexError):
+            Const(10)[5]
+
+    def test_getitem_slice(self):
+        s1 = Const(10)[1:3]
+        self.assertIsInstance(s1, Slice)
+        self.assertEqual(s1.start, 1)
+        self.assertEqual(s1.end, 3)
+        s2 = Const(10)[1:-2]
+        self.assertIsInstance(s2, Slice)
+        self.assertEqual(s2.start, 1)
+        self.assertEqual(s2.end, 2)
+        s3 = Const(31)[::2]
+        self.assertIsInstance(s3, Cat)
+        self.assertIsInstance(s3.operands[0], Slice)
+        self.assertEqual(s3.operands[0].start, 0)
+        self.assertEqual(s3.operands[0].end, 1)
+        self.assertIsInstance(s3.operands[1], Slice)
+        self.assertEqual(s3.operands[1].start, 2)
+        self.assertEqual(s3.operands[1].end, 3)
+        self.assertIsInstance(s3.operands[2], Slice)
+        self.assertEqual(s3.operands[2].start, 4)
+        self.assertEqual(s3.operands[2].end, 5)
+
+    def test_getitem_wrong(self):
+        with self.assertRaises(TypeError):
+            Const(31)["str"]
+
+
+class ConstTestCase(FHDLTestCase):
+    def test_shape(self):
+        self.assertEqual(Const(0).shape(),   (1, False))
+        self.assertEqual(Const(1).shape(),   (1, False))
+        self.assertEqual(Const(10).shape(),  (4, False))
+        self.assertEqual(Const(-10).shape(), (5, True))
+
+        self.assertEqual(Const(1, 4).shape(),          (4, False))
+        self.assertEqual(Const(1, (4, True)).shape(),  (4, True))
+        self.assertEqual(Const(0, (0, False)).shape(), (0, False))
+
+    def test_shape_bad(self):
+        with self.assertRaises(TypeError):
+            Const(1, -1)
+
+    def test_normalization(self):
+        self.assertEqual(Const(0b10110, (5, True)).value, -10)
+
+    def test_value(self):
+        self.assertEqual(Const(10).value, 10)
+
+    def test_repr(self):
+        self.assertEqual(repr(Const(10)),  "(const 4'd10)")
+        self.assertEqual(repr(Const(-10)), "(const 5'sd-10)")
+
+    def test_hash(self):
+        with self.assertRaises(TypeError):
+            hash(Const(0))
+
+
+class OperatorTestCase(FHDLTestCase):
+    def test_invert(self):
+        v = ~Const(0, 4)
+        self.assertEqual(repr(v), "(~ (const 4'd0))")
+        self.assertEqual(v.shape(), (4, False))
+
+    def test_neg(self):
+        v1 = -Const(0, (4, False))
+        self.assertEqual(repr(v1), "(- (const 4'd0))")
+        self.assertEqual(v1.shape(), (5, True))
+        v2 = -Const(0, (4, True))
+        self.assertEqual(repr(v2), "(- (const 4'sd0))")
+        self.assertEqual(v2.shape(), (4, True))
+
+    def test_add(self):
+        v1 = Const(0, (4, False)) + Const(0, (6, False))
+        self.assertEqual(repr(v1), "(+ (const 4'd0) (const 6'd0))")
+        self.assertEqual(v1.shape(), (7, False))
+        v2 = Const(0, (4, True)) + Const(0, (6, True))
+        self.assertEqual(v2.shape(), (7, True))
+        v3 = Const(0, (4, True)) + Const(0, (4, False))
+        self.assertEqual(v3.shape(), (6, True))
+        v4 = Const(0, (4, False)) + Const(0, (4, True))
+        self.assertEqual(v4.shape(), (6, True))
+        v5 = 10 + Const(0, 4)
+        self.assertEqual(v5.shape(), (5, False))
+
+    def test_sub(self):
+        v1 = Const(0, (4, False)) - Const(0, (6, False))
+        self.assertEqual(repr(v1), "(- (const 4'd0) (const 6'd0))")
+        self.assertEqual(v1.shape(), (7, False))
+        v2 = Const(0, (4, True)) - Const(0, (6, True))
+        self.assertEqual(v2.shape(), (7, True))
+        v3 = Const(0, (4, True)) - Const(0, (4, False))
+        self.assertEqual(v3.shape(), (6, True))
+        v4 = Const(0, (4, False)) - Const(0, (4, True))
+        self.assertEqual(v4.shape(), (6, True))
+        v5 = 10 - Const(0, 4)
+        self.assertEqual(v5.shape(), (5, False))
+
+    def test_mul(self):
+        v1 = Const(0, (4, False)) * Const(0, (6, False))
+        self.assertEqual(repr(v1), "(* (const 4'd0) (const 6'd0))")
+        self.assertEqual(v1.shape(), (10, False))
+        v2 = Const(0, (4, True)) * Const(0, (6, True))
+        self.assertEqual(v2.shape(), (9, True))
+        v3 = Const(0, (4, True)) * Const(0, (4, False))
+        self.assertEqual(v3.shape(), (8, True))
+        v5 = 10 * Const(0, 4)
+        self.assertEqual(v5.shape(), (8, False))
+
+    def test_and(self):
+        v1 = Const(0, (4, False)) & Const(0, (6, False))
+        self.assertEqual(repr(v1), "(& (const 4'd0) (const 6'd0))")
+        self.assertEqual(v1.shape(), (6, False))
+        v2 = Const(0, (4, True)) & Const(0, (6, True))
+        self.assertEqual(v2.shape(), (6, True))
+        v3 = Const(0, (4, True)) & Const(0, (4, False))
+        self.assertEqual(v3.shape(), (5, True))
+        v4 = Const(0, (4, False)) & Const(0, (4, True))
+        self.assertEqual(v4.shape(), (5, True))
+        v5 = 10 & Const(0, 4)
+        self.assertEqual(v5.shape(), (4, False))
+
+    def test_or(self):
+        v1 = Const(0, (4, False)) | Const(0, (6, False))
+        self.assertEqual(repr(v1), "(| (const 4'd0) (const 6'd0))")
+        self.assertEqual(v1.shape(), (6, False))
+        v2 = Const(0, (4, True)) | Const(0, (6, True))
+        self.assertEqual(v2.shape(), (6, True))
+        v3 = Const(0, (4, True)) | Const(0, (4, False))
+        self.assertEqual(v3.shape(), (5, True))
+        v4 = Const(0, (4, False)) | Const(0, (4, True))
+        self.assertEqual(v4.shape(), (5, True))
+        v5 = 10 | Const(0, 4)
+        self.assertEqual(v5.shape(), (4, False))
+
+    def test_xor(self):
+        v1 = Const(0, (4, False)) ^ Const(0, (6, False))
+        self.assertEqual(repr(v1), "(^ (const 4'd0) (const 6'd0))")
+        self.assertEqual(v1.shape(), (6, False))
+        v2 = Const(0, (4, True)) ^ Const(0, (6, True))
+        self.assertEqual(v2.shape(), (6, True))
+        v3 = Const(0, (4, True)) ^ Const(0, (4, False))
+        self.assertEqual(v3.shape(), (5, True))
+        v4 = Const(0, (4, False)) ^ Const(0, (4, True))
+        self.assertEqual(v4.shape(), (5, True))
+        v5 = 10 ^ Const(0, 4)
+        self.assertEqual(v5.shape(), (4, False))
+
+    def test_lt(self):
+        v = Const(0, 4) < Const(0, 6)
+        self.assertEqual(repr(v), "(< (const 4'd0) (const 6'd0))")
+        self.assertEqual(v.shape(), (1, False))
+
+    def test_le(self):
+        v = Const(0, 4) <= Const(0, 6)
+        self.assertEqual(repr(v), "(<= (const 4'd0) (const 6'd0))")
+        self.assertEqual(v.shape(), (1, False))
+
+    def test_gt(self):
+        v = Const(0, 4) > Const(0, 6)
+        self.assertEqual(repr(v), "(> (const 4'd0) (const 6'd0))")
+        self.assertEqual(v.shape(), (1, False))
+
+    def test_ge(self):
+        v = Const(0, 4) >= Const(0, 6)
+        self.assertEqual(repr(v), "(>= (const 4'd0) (const 6'd0))")
+        self.assertEqual(v.shape(), (1, False))
+
+    def test_eq(self):
+        v = Const(0, 4) == Const(0, 6)
+        self.assertEqual(repr(v), "(== (const 4'd0) (const 6'd0))")
+        self.assertEqual(v.shape(), (1, False))
+
+    def test_ne(self):
+        v = Const(0, 4) != Const(0, 6)
+        self.assertEqual(repr(v), "(!= (const 4'd0) (const 6'd0))")
+        self.assertEqual(v.shape(), (1, False))
+
+    def test_mux(self):
+        s  = Const(0)
+        v1 = Mux(s, Const(0, (4, False)), Const(0, (6, False)))
+        self.assertEqual(repr(v1), "(m (const 1'd0) (const 4'd0) (const 6'd0))")
+        self.assertEqual(v1.shape(), (6, False))
+        v2 = Mux(s, Const(0, (4, True)), Const(0, (6, True)))
+        self.assertEqual(v2.shape(), (6, True))
+        v3 = Mux(s, Const(0, (4, True)), Const(0, (4, False)))
+        self.assertEqual(v3.shape(), (5, True))
+        v4 = Mux(s, Const(0, (4, False)), Const(0, (4, True)))
+        self.assertEqual(v4.shape(), (5, True))
+
+    def test_bool(self):
+        v = Const(0).bool()
+        self.assertEqual(repr(v), "(b (const 1'd0))")
+        self.assertEqual(v.shape(), (1, False))
+
+    def test_hash(self):
+        with self.assertRaises(TypeError):
+            hash(Const(0) + Const(0))
+
+
+class SliceTestCase(FHDLTestCase):
+    def test_shape(self):
+        s1 = Const(10)[2]
+        self.assertEqual(s1.shape(), (1, False))
+        s2 = Const(-10)[0:2]
+        self.assertEqual(s2.shape(), (2, False))
+
+    def test_start_end_negative(self):
+        c  = Const(0, 8)
+        s1 = Slice(c, 0, -1)
+        self.assertEqual((s1.start, s1.end), (0, 7))
+        s1 = Slice(c, -4, -1)
+        self.assertEqual((s1.start, s1.end), (4, 7))
+
+    def test_start_end_wrong(self):
+        with self.assertRaises(TypeError):
+            Slice(0, "x", 1)
+        with self.assertRaises(TypeError):
+            Slice(0, 1, "x")
+
+    def test_start_end_out_of_range(self):
+        c = Const(0, 8)
+        with self.assertRaises(IndexError):
+            Slice(c, 10, 12)
+        with self.assertRaises(IndexError):
+            Slice(c, 0, 12)
+        with self.assertRaises(IndexError):
+            Slice(c, 4, 2)
+
+    def test_repr(self):
+        s1 = Const(10)[2]
+        self.assertEqual(repr(s1), "(slice (const 4'd10) 2:3)")
+
+
+class PartTestCase(FHDLTestCase):
+    def setUp(self):
+        self.c = Const(0, 8)
+        self.s = Signal(max=self.c.nbits)
+
+    def test_shape(self):
+        s1 = self.c.part(self.s, 2)
+        self.assertEqual(s1.shape(), (2, False))
+        s2 = self.c.part(self.s, 0)
+        self.assertEqual(s2.shape(), (0, False))
+
+    def test_width_bad(self):
+        with self.assertRaises(TypeError):
+            self.c.part(self.s, -1)
+
+    def test_repr(self):
+        s = self.c.part(self.s, 2)
+        self.assertEqual(repr(s), "(part (const 8'd0) (sig s) 2)")
+
+
+class CatTestCase(FHDLTestCase):
+    def test_shape(self):
+        c1 = Cat(Const(10))
+        self.assertEqual(c1.shape(), (4, False))
+        c2 = Cat(Const(10), Const(1))
+        self.assertEqual(c2.shape(), (5, False))
+        c3 = Cat(Const(10), Const(1), Const(0))
+        self.assertEqual(c3.shape(), (6, False))
+
+    def test_repr(self):
+        c1 = Cat(Const(10), Const(1))
+        self.assertEqual(repr(c1), "(cat (const 4'd10) (const 1'd1))")
+
+
+class ReplTestCase(FHDLTestCase):
+    def test_shape(self):
+        s1 = Repl(Const(10), 3)
+        self.assertEqual(s1.shape(), (12, False))
+        s2 = Repl(Const(10), 0)
+        self.assertEqual(s2.shape(), (0, False))
+
+    def test_count_wrong(self):
+        with self.assertRaises(TypeError):
+            Repl(Const(10), -1)
+        with self.assertRaises(TypeError):
+            Repl(Const(10), "str")
+
+    def test_repr(self):
+        s = Repl(Const(10), 3)
+        self.assertEqual(repr(s), "(repl (const 4'd10) 3)")
+
+
+class SignalTestCase(FHDLTestCase):
+    def test_shape(self):
+        s1 = Signal()
+        self.assertEqual(s1.shape(), (1, False))
+        s2 = Signal(2)
+        self.assertEqual(s2.shape(), (2, False))
+        s3 = Signal((2, False))
+        self.assertEqual(s3.shape(), (2, False))
+        s4 = Signal((2, True))
+        self.assertEqual(s4.shape(), (2, True))
+        s5 = Signal(max=16)
+        self.assertEqual(s5.shape(), (4, False))
+        s6 = Signal(min=4, max=16)
+        self.assertEqual(s6.shape(), (4, False))
+        s7 = Signal(min=-4, max=16)
+        self.assertEqual(s7.shape(), (5, True))
+        s8 = Signal(min=-20, max=16)
+        self.assertEqual(s8.shape(), (6, True))
+        s9 = Signal(0)
+        self.assertEqual(s9.shape(), (0, False))
+
+    def test_shape_bad(self):
+        with self.assertRaises(ValueError):
+            Signal(min=10, max=4)
+        with self.assertRaises(ValueError):
+            Signal(2, min=10)
+        with self.assertRaises(TypeError):
+            Signal(-10)
+
+    def test_name(self):
+        s1 = Signal()
+        self.assertEqual(s1.name, "s1")
+        s2 = Signal(name="sig")
+        self.assertEqual(s2.name, "sig")
+
+    def test_reset(self):
+        s1 = Signal(4, reset=0b111, reset_less=True)
+        self.assertEqual(s1.reset, 0b111)
+        self.assertEqual(s1.reset_less, True)
+
+    def test_attrs(self):
+        s1 = Signal()
+        self.assertEqual(s1.attrs, {})
+        s2 = Signal(attrs={"no_retiming": True})
+        self.assertEqual(s2.attrs, {"no_retiming": True})
+
+    def test_repr(self):
+        s1 = Signal()
+        self.assertEqual(repr(s1), "(sig s1)")
+
+    def test_like(self):
+        s1 = Signal.like(Signal(4))
+        self.assertEqual(s1.shape(), (4, False))
+        s2 = Signal.like(Signal(min=-15))
+        self.assertEqual(s2.shape(), (5, True))
+        s3 = Signal.like(Signal(4, reset=0b111, reset_less=True))
+        self.assertEqual(s3.reset, 0b111)
+        self.assertEqual(s3.reset_less, True)
+        s4 = Signal.like(Signal(attrs={"no_retiming": True}))
+        self.assertEqual(s4.attrs, {"no_retiming": True})
+        s5 = Signal.like(Signal(decoder=str))
+        self.assertEqual(s5.decoder, str)
+        s6 = Signal.like(10)
+        self.assertEqual(s6.shape(), (4, False))
+
+
+class ClockSignalTestCase(FHDLTestCase):
+    def test_domain(self):
+        s1 = ClockSignal()
+        self.assertEqual(s1.domain, "sync")
+        s2 = ClockSignal("pix")
+        self.assertEqual(s2.domain, "pix")
+
+        with self.assertRaises(TypeError):
+            ClockSignal(1)
+
+    def test_shape(self):
+        self.assertEqual(ClockSignal().shape(), (1, False))
+
+    def test_repr(self):
+        s1 = ClockSignal()
+        self.assertEqual(repr(s1), "(clk sync)")
+
+
+class ResetSignalTestCase(FHDLTestCase):
+    def test_domain(self):
+        s1 = ResetSignal()
+        self.assertEqual(s1.domain, "sync")
+        s2 = ResetSignal("pix")
+        self.assertEqual(s2.domain, "pix")
+
+        with self.assertRaises(TypeError):
+            ResetSignal(1)
+
+    def test_shape(self):
+        self.assertEqual(ResetSignal().shape(), (1, False))
+
+    def test_repr(self):
+        s1 = ResetSignal()
+        self.assertEqual(repr(s1), "(rst sync)")
diff --git a/nmigen/test/test_fhdl_value.py b/nmigen/test/test_fhdl_value.py
deleted file mode 100644
index 8e7dfd1..0000000
--- a/nmigen/test/test_fhdl_value.py
+++ /dev/null
@@ -1,360 +0,0 @@
-from ..fhdl.ast import *
-from .tools import *
-
-
-class ValueTestCase(FHDLTestCase):
-    def test_wrap(self):
-        self.assertIsInstance(Value.wrap(0), Const)
-        self.assertIsInstance(Value.wrap(True), Const)
-        c = Const(0)
-        self.assertIs(Value.wrap(c), c)
-        with self.assertRaises(TypeError):
-            Value.wrap("str")
-
-    def test_bool(self):
-        with self.assertRaises(TypeError):
-            if Const(0):
-                pass
-
-    def test_len(self):
-        self.assertEqual(len(Const(10)), 4)
-
-    def test_getitem_int(self):
-        s1 = Const(10)[0]
-        self.assertIsInstance(s1, Slice)
-        self.assertEqual(s1.start, 0)
-        self.assertEqual(s1.end, 1)
-        s2 = Const(10)[-1]
-        self.assertIsInstance(s2, Slice)
-        self.assertEqual(s2.start, 3)
-        self.assertEqual(s2.end, 4)
-        with self.assertRaises(IndexError):
-            Const(10)[5]
-
-    def test_getitem_slice(self):
-        s1 = Const(10)[1:3]
-        self.assertIsInstance(s1, Slice)
-        self.assertEqual(s1.start, 1)
-        self.assertEqual(s1.end, 3)
-        s2 = Const(10)[1:-2]
-        self.assertIsInstance(s2, Slice)
-        self.assertEqual(s2.start, 1)
-        self.assertEqual(s2.end, 2)
-        s3 = Const(31)[::2]
-        self.assertIsInstance(s3, Cat)
-        self.assertIsInstance(s3.operands[0], Slice)
-        self.assertEqual(s3.operands[0].start, 0)
-        self.assertEqual(s3.operands[0].end, 1)
-        self.assertIsInstance(s3.operands[1], Slice)
-        self.assertEqual(s3.operands[1].start, 2)
-        self.assertEqual(s3.operands[1].end, 3)
-        self.assertIsInstance(s3.operands[2], Slice)
-        self.assertEqual(s3.operands[2].start, 4)
-        self.assertEqual(s3.operands[2].end, 5)
-
-    def test_getitem_wrong(self):
-        with self.assertRaises(TypeError):
-            Const(31)["str"]
-
-
-class ConstTestCase(FHDLTestCase):
-    def test_shape(self):
-        self.assertEqual(Const(0).shape(),   (1, False))
-        self.assertEqual(Const(1).shape(),   (1, False))
-        self.assertEqual(Const(10).shape(),  (4, False))
-        self.assertEqual(Const(-10).shape(), (5, True))
-
-        self.assertEqual(Const(1, 4).shape(),         (4, False))
-        self.assertEqual(Const(1, (4, True)).shape(), (4, True))
-
-        with self.assertRaises(TypeError):
-            Const(1, -1)
-
-    def test_normalization(self):
-        self.assertEqual(Const(0b10110, (5, True)).value, -10)
-
-    def test_value(self):
-        self.assertEqual(Const(10).value, 10)
-
-    def test_repr(self):
-        self.assertEqual(repr(Const(10)),  "(const 4'd10)")
-        self.assertEqual(repr(Const(-10)), "(const 5'sd-10)")
-
-    def test_hash(self):
-        with self.assertRaises(TypeError):
-            hash(Const(0))
-
-
-class OperatorTestCase(FHDLTestCase):
-    def test_invert(self):
-        v = ~Const(0, 4)
-        self.assertEqual(repr(v), "(~ (const 4'd0))")
-        self.assertEqual(v.shape(), (4, False))
-
-    def test_neg(self):
-        v1 = -Const(0, (4, False))
-        self.assertEqual(repr(v1), "(- (const 4'd0))")
-        self.assertEqual(v1.shape(), (5, True))
-        v2 = -Const(0, (4, True))
-        self.assertEqual(repr(v2), "(- (const 4'sd0))")
-        self.assertEqual(v2.shape(), (4, True))
-
-    def test_add(self):
-        v1 = Const(0, (4, False)) + Const(0, (6, False))
-        self.assertEqual(repr(v1), "(+ (const 4'd0) (const 6'd0))")
-        self.assertEqual(v1.shape(), (7, False))
-        v2 = Const(0, (4, True)) + Const(0, (6, True))
-        self.assertEqual(v2.shape(), (7, True))
-        v3 = Const(0, (4, True)) + Const(0, (4, False))
-        self.assertEqual(v3.shape(), (6, True))
-        v4 = Const(0, (4, False)) + Const(0, (4, True))
-        self.assertEqual(v4.shape(), (6, True))
-        v5 = 10 + Const(0, 4)
-        self.assertEqual(v5.shape(), (5, False))
-
-    def test_sub(self):
-        v1 = Const(0, (4, False)) - Const(0, (6, False))
-        self.assertEqual(repr(v1), "(- (const 4'd0) (const 6'd0))")
-        self.assertEqual(v1.shape(), (7, False))
-        v2 = Const(0, (4, True)) - Const(0, (6, True))
-        self.assertEqual(v2.shape(), (7, True))
-        v3 = Const(0, (4, True)) - Const(0, (4, False))
-        self.assertEqual(v3.shape(), (6, True))
-        v4 = Const(0, (4, False)) - Const(0, (4, True))
-        self.assertEqual(v4.shape(), (6, True))
-        v5 = 10 - Const(0, 4)
-        self.assertEqual(v5.shape(), (5, False))
-
-    def test_mul(self):
-        v1 = Const(0, (4, False)) * Const(0, (6, False))
-        self.assertEqual(repr(v1), "(* (const 4'd0) (const 6'd0))")
-        self.assertEqual(v1.shape(), (10, False))
-        v2 = Const(0, (4, True)) * Const(0, (6, True))
-        self.assertEqual(v2.shape(), (9, True))
-        v3 = Const(0, (4, True)) * Const(0, (4, False))
-        self.assertEqual(v3.shape(), (8, True))
-        v5 = 10 * Const(0, 4)
-        self.assertEqual(v5.shape(), (8, False))
-
-    def test_and(self):
-        v1 = Const(0, (4, False)) & Const(0, (6, False))
-        self.assertEqual(repr(v1), "(& (const 4'd0) (const 6'd0))")
-        self.assertEqual(v1.shape(), (6, False))
-        v2 = Const(0, (4, True)) & Const(0, (6, True))
-        self.assertEqual(v2.shape(), (6, True))
-        v3 = Const(0, (4, True)) & Const(0, (4, False))
-        self.assertEqual(v3.shape(), (5, True))
-        v4 = Const(0, (4, False)) & Const(0, (4, True))
-        self.assertEqual(v4.shape(), (5, True))
-        v5 = 10 & Const(0, 4)
-        self.assertEqual(v5.shape(), (4, False))
-
-    def test_or(self):
-        v1 = Const(0, (4, False)) | Const(0, (6, False))
-        self.assertEqual(repr(v1), "(| (const 4'd0) (const 6'd0))")
-        self.assertEqual(v1.shape(), (6, False))
-        v2 = Const(0, (4, True)) | Const(0, (6, True))
-        self.assertEqual(v2.shape(), (6, True))
-        v3 = Const(0, (4, True)) | Const(0, (4, False))
-        self.assertEqual(v3.shape(), (5, True))
-        v4 = Const(0, (4, False)) | Const(0, (4, True))
-        self.assertEqual(v4.shape(), (5, True))
-        v5 = 10 | Const(0, 4)
-        self.assertEqual(v5.shape(), (4, False))
-
-    def test_xor(self):
-        v1 = Const(0, (4, False)) ^ Const(0, (6, False))
-        self.assertEqual(repr(v1), "(^ (const 4'd0) (const 6'd0))")
-        self.assertEqual(v1.shape(), (6, False))
-        v2 = Const(0, (4, True)) ^ Const(0, (6, True))
-        self.assertEqual(v2.shape(), (6, True))
-        v3 = Const(0, (4, True)) ^ Const(0, (4, False))
-        self.assertEqual(v3.shape(), (5, True))
-        v4 = Const(0, (4, False)) ^ Const(0, (4, True))
-        self.assertEqual(v4.shape(), (5, True))
-        v5 = 10 ^ Const(0, 4)
-        self.assertEqual(v5.shape(), (4, False))
-
-    def test_lt(self):
-        v = Const(0, 4) < Const(0, 6)
-        self.assertEqual(repr(v), "(< (const 4'd0) (const 6'd0))")
-        self.assertEqual(v.shape(), (1, False))
-
-    def test_le(self):
-        v = Const(0, 4) <= Const(0, 6)
-        self.assertEqual(repr(v), "(<= (const 4'd0) (const 6'd0))")
-        self.assertEqual(v.shape(), (1, False))
-
-    def test_gt(self):
-        v = Const(0, 4) > Const(0, 6)
-        self.assertEqual(repr(v), "(> (const 4'd0) (const 6'd0))")
-        self.assertEqual(v.shape(), (1, False))
-
-    def test_ge(self):
-        v = Const(0, 4) >= Const(0, 6)
-        self.assertEqual(repr(v), "(>= (const 4'd0) (const 6'd0))")
-        self.assertEqual(v.shape(), (1, False))
-
-    def test_eq(self):
-        v = Const(0, 4) == Const(0, 6)
-        self.assertEqual(repr(v), "(== (const 4'd0) (const 6'd0))")
-        self.assertEqual(v.shape(), (1, False))
-
-    def test_ne(self):
-        v = Const(0, 4) != Const(0, 6)
-        self.assertEqual(repr(v), "(!= (const 4'd0) (const 6'd0))")
-        self.assertEqual(v.shape(), (1, False))
-
-    def test_mux(self):
-        s  = Const(0)
-        v1 = Mux(s, Const(0, (4, False)), Const(0, (6, False)))
-        self.assertEqual(repr(v1), "(m (const 1'd0) (const 4'd0) (const 6'd0))")
-        self.assertEqual(v1.shape(), (6, False))
-        v2 = Mux(s, Const(0, (4, True)), Const(0, (6, True)))
-        self.assertEqual(v2.shape(), (6, True))
-        v3 = Mux(s, Const(0, (4, True)), Const(0, (4, False)))
-        self.assertEqual(v3.shape(), (5, True))
-        v4 = Mux(s, Const(0, (4, False)), Const(0, (4, True)))
-        self.assertEqual(v4.shape(), (5, True))
-
-    def test_bool(self):
-        v = Const(0).bool()
-        self.assertEqual(repr(v), "(b (const 1'd0))")
-        self.assertEqual(v.shape(), (1, False))
-
-    def test_hash(self):
-        with self.assertRaises(TypeError):
-            hash(Const(0) + Const(0))
-
-
-class SliceTestCase(FHDLTestCase):
-    def test_shape(self):
-        s1 = Const(10)[2]
-        self.assertEqual(s1.shape(), (1, False))
-        s2 = Const(-10)[0:2]
-        self.assertEqual(s2.shape(), (2, False))
-
-    def test_repr(self):
-        s1 = Const(10)[2]
-        self.assertEqual(repr(s1), "(slice (const 4'd10) 2:3)")
-
-
-class CatTestCase(FHDLTestCase):
-    def test_shape(self):
-        c1 = Cat(Const(10))
-        self.assertEqual(c1.shape(), (4, False))
-        c2 = Cat(Const(10), Const(1))
-        self.assertEqual(c2.shape(), (5, False))
-        c3 = Cat(Const(10), Const(1), Const(0))
-        self.assertEqual(c3.shape(), (6, False))
-
-    def test_repr(self):
-        c1 = Cat(Const(10), Const(1))
-        self.assertEqual(repr(c1), "(cat (const 4'd10) (const 1'd1))")
-
-
-class ReplTestCase(FHDLTestCase):
-    def test_shape(self):
-        r1 = Repl(Const(10), 3)
-        self.assertEqual(r1.shape(), (12, False))
-
-    def test_count_wrong(self):
-        with self.assertRaises(TypeError):
-            Repl(Const(10), -1)
-        with self.assertRaises(TypeError):
-            Repl(Const(10), "str")
-
-    def test_repr(self):
-        r1 = Repl(Const(10), 3)
-        self.assertEqual(repr(r1), "(repl (const 4'd10) 3)")
-
-
-class SignalTestCase(FHDLTestCase):
-    def test_shape(self):
-        s1 = Signal()
-        self.assertEqual(s1.shape(), (1, False))
-        s2 = Signal(2)
-        self.assertEqual(s2.shape(), (2, False))
-        s3 = Signal((2, False))
-        self.assertEqual(s3.shape(), (2, False))
-        s4 = Signal((2, True))
-        self.assertEqual(s4.shape(), (2, True))
-        s5 = Signal(max=16)
-        self.assertEqual(s5.shape(), (4, False))
-        s6 = Signal(min=4, max=16)
-        self.assertEqual(s6.shape(), (4, False))
-        s7 = Signal(min=-4, max=16)
-        self.assertEqual(s7.shape(), (5, True))
-        s8 = Signal(min=-20, max=16)
-        self.assertEqual(s8.shape(), (6, True))
-
-        with self.assertRaises(ValueError):
-            Signal(min=10, max=4)
-        with self.assertRaises(ValueError):
-            Signal(2, min=10)
-        with self.assertRaises(TypeError):
-            Signal(-10)
-
-    def test_name(self):
-        s1 = Signal()
-        self.assertEqual(s1.name, "s1")
-        s2 = Signal(name="sig")
-        self.assertEqual(s2.name, "sig")
-
-    def test_reset(self):
-        s1 = Signal(4, reset=0b111, reset_less=True)
-        self.assertEqual(s1.reset, 0b111)
-        self.assertEqual(s1.reset_less, True)
-
-    def test_attrs(self):
-        s1 = Signal()
-        self.assertEqual(s1.attrs, {})
-        s2 = Signal(attrs={"no_retiming": True})
-        self.assertEqual(s2.attrs, {"no_retiming": True})
-
-    def test_repr(self):
-        s1 = Signal()
-        self.assertEqual(repr(s1), "(sig s1)")
-
-    def test_like(self):
-        s1 = Signal.like(Signal(4))
-        self.assertEqual(s1.shape(), (4, False))
-        s2 = Signal.like(Signal(min=-15))
-        self.assertEqual(s2.shape(), (5, True))
-        s3 = Signal.like(Signal(4, reset=0b111, reset_less=True))
-        self.assertEqual(s3.reset, 0b111)
-        self.assertEqual(s3.reset_less, True)
-        s4 = Signal.like(Signal(attrs={"no_retiming": True}))
-        self.assertEqual(s4.attrs, {"no_retiming": True})
-        s5 = Signal.like(10)
-        self.assertEqual(s5.shape(), (4, False))
-
-
-class ClockSignalTestCase(FHDLTestCase):
-    def test_domain(self):
-        s1 = ClockSignal()
-        self.assertEqual(s1.domain, "sync")
-        s2 = ClockSignal("pix")
-        self.assertEqual(s2.domain, "pix")
-
-        with self.assertRaises(TypeError):
-            ClockSignal(1)
-
-    def test_repr(self):
-        s1 = ClockSignal()
-        self.assertEqual(repr(s1), "(clk sync)")
-
-
-class ResetSignalTestCase(FHDLTestCase):
-    def test_domain(self):
-        s1 = ResetSignal()
-        self.assertEqual(s1.domain, "sync")
-        s2 = ResetSignal("pix")
-        self.assertEqual(s2.domain, "pix")
-
-        with self.assertRaises(TypeError):
-            ResetSignal(1)
-
-    def test_repr(self):
-        s1 = ResetSignal()
-        self.assertEqual(repr(s1), "(rst sync)")