import warnings from enum import Enum, EnumMeta from amaranth.hdl._ast import * from amaranth.lib.enum import Enum as AmaranthEnum from .utils import * from amaranth._utils import _ignore_deprecated class UnsignedEnum(Enum): FOO = 1 BAR = 2 BAZ = 3 class SignedEnum(Enum): FOO = -1 BAR = 0 BAZ = +1 class StringEnum(Enum): FOO = "a" BAR = "b" class TypedEnum(int, Enum): FOO = 1 BAR = 2 BAZ = 3 class ShapeTestCase(FHDLTestCase): def test_make(self): s1 = Shape() self.assertEqual(s1.width, 1) self.assertEqual(s1.signed, False) s2 = Shape(signed=True) self.assertEqual(s2.width, 1) self.assertEqual(s2.signed, True) s3 = Shape(3, True) self.assertEqual(s3.width, 3) self.assertEqual(s3.signed, True) s4 = Shape(0) self.assertEqual(s4.width, 0) self.assertEqual(s4.signed, False) def test_make_wrong(self): with self.assertRaisesRegex(TypeError, r"^Width must be an integer, not 'a'$"): Shape("a") with self.assertRaisesRegex(TypeError, r"^Width of an unsigned value must be zero or a positive integer, not -1$"): Shape(-1, signed=False) with self.assertRaisesRegex(TypeError, r"^Width of a signed value must be a positive integer, not 0$"): Shape(0, signed=True) def test_compare_non_shape(self): self.assertNotEqual(Shape(1, True), "hi") def test_repr(self): self.assertEqual(repr(Shape()), "unsigned(1)") self.assertEqual(repr(Shape(2, True)), "signed(2)") def test_convert_tuple_wrong(self): with self.assertRaisesRegex(TypeError, r"^cannot unpack non-iterable Shape object$"): width, signed = Shape() def test_unsigned(self): s1 = unsigned(2) self.assertIsInstance(s1, Shape) self.assertEqual(s1.width, 2) self.assertEqual(s1.signed, False) def test_signed(self): s1 = signed(2) self.assertIsInstance(s1, Shape) self.assertEqual(s1.width, 2) self.assertEqual(s1.signed, True) def test_cast_shape(self): s1 = Shape.cast(unsigned(1)) self.assertEqual(s1.width, 1) self.assertEqual(s1.signed, False) s2 = Shape.cast(signed(3)) self.assertEqual(s2.width, 3) self.assertEqual(s2.signed, True) def test_cast_int(self): s1 = Shape.cast(2) self.assertEqual(s1.width, 2) self.assertEqual(s1.signed, False) def test_cast_int_wrong(self): with self.assertRaisesRegex(TypeError, r"^Width of an unsigned value must be zero or a positive integer, not -1$"): Shape.cast(-1) def test_cast_tuple_wrong(self): with self.assertRaisesRegex(TypeError, r"^Object \(1, True\) cannot be converted to an Amaranth shape$"): Shape.cast((1, True)) def test_cast_range(self): s1 = Shape.cast(range(0, 8)) self.assertEqual(s1.width, 3) self.assertEqual(s1.signed, False) s2 = Shape.cast(range(0, 9)) self.assertEqual(s2.width, 4) self.assertEqual(s2.signed, False) s3 = Shape.cast(range(-7, 8)) self.assertEqual(s3.width, 4) self.assertEqual(s3.signed, True) s4 = Shape.cast(range(0, 1)) self.assertEqual(s4.width, 1) self.assertEqual(s4.signed, False) s5 = Shape.cast(range(-1, 0)) self.assertEqual(s5.width, 1) self.assertEqual(s5.signed, True) s6 = Shape.cast(range(0, 0)) self.assertEqual(s6.width, 0) self.assertEqual(s6.signed, False) s7 = Shape.cast(range(-1, -1)) self.assertEqual(s7.width, 0) self.assertEqual(s7.signed, False) s8 = Shape.cast(range(0, 10, 3)) self.assertEqual(s8.width, 4) self.assertEqual(s8.signed, False) def test_cast_enum(self): s1 = Shape.cast(UnsignedEnum) self.assertEqual(s1.width, 2) self.assertEqual(s1.signed, False) s2 = Shape.cast(SignedEnum) self.assertEqual(s2.width, 2) self.assertEqual(s2.signed, True) def test_cast_enum_bad(self): with self.assertRaisesRegex(TypeError, r"^Only enumerations whose members have constant-castable values can be used " r"in Amaranth code$"): Shape.cast(StringEnum) def test_cast_bad(self): with self.assertRaisesRegex(TypeError, r"^Object 'foo' cannot be converted to an Amaranth shape$"): Shape.cast("foo") class MockShapeCastable(ShapeCastable): def __init__(self, dest): self.dest = dest def as_shape(self): return self.dest def __call__(self, value): return value def const(self, init): return Const(init, self.dest) class ShapeCastableTestCase(FHDLTestCase): def test_no_override(self): with self.assertRaisesRegex(TypeError, r"^Class 'MockShapeCastableNoOverride' deriving from `ShapeCastable` must " r"override the `as_shape` method$"): class MockShapeCastableNoOverride(ShapeCastable): def __init__(self): pass def test_cast(self): sc = MockShapeCastable(unsigned(2)) self.assertEqual(Shape.cast(sc), unsigned(2)) def test_recurse_bad(self): sc = MockShapeCastable(None) sc.dest = sc with self.assertRaisesRegex(RecursionError, r"^Shape-castable object <.+> casts to itself$"): Shape.cast(sc) def test_recurse(self): sc = MockShapeCastable(MockShapeCastable(unsigned(1))) self.assertEqual(Shape.cast(sc), unsigned(1)) class ShapeLikeTestCase(FHDLTestCase): def test_construct(self): with self.assertRaises(TypeError): ShapeLike() def test_subclass(self): self.assertTrue(issubclass(Shape, ShapeLike)) self.assertTrue(issubclass(MockShapeCastable, ShapeLike)) self.assertTrue(issubclass(int, ShapeLike)) self.assertTrue(issubclass(range, ShapeLike)) self.assertTrue(issubclass(EnumMeta, ShapeLike)) self.assertFalse(issubclass(Enum, ShapeLike)) self.assertFalse(issubclass(str, ShapeLike)) self.assertTrue(issubclass(ShapeLike, ShapeLike)) def test_isinstance(self): self.assertTrue(isinstance(unsigned(2), ShapeLike)) self.assertTrue(isinstance(MockShapeCastable(unsigned(2)), ShapeLike)) self.assertTrue(isinstance(2, ShapeLike)) self.assertTrue(isinstance(0, ShapeLike)) self.assertFalse(isinstance(-1, ShapeLike)) self.assertTrue(isinstance(range(10), ShapeLike)) self.assertFalse(isinstance("abc", ShapeLike)) def test_isinstance_enum(self): class EnumA(Enum): A = 1 B = 2 class EnumB(Enum): A = "a" B = "b" class EnumC(Enum): A = Cat(Const(1, 2), Const(0, 2)) self.assertTrue(isinstance(EnumA, ShapeLike)) self.assertFalse(isinstance(EnumB, ShapeLike)) self.assertTrue(isinstance(EnumC, ShapeLike)) class ValueTestCase(FHDLTestCase): def test_cast(self): self.assertIsInstance(Value.cast(0), Const) self.assertIsInstance(Value.cast(True), Const) c = Const(0) self.assertIs(Value.cast(c), c) with self.assertRaisesRegex(TypeError, r"^Object 'str' cannot be converted to an Amaranth value$"): Value.cast("str") def test_cast_enum(self): e1 = Value.cast(UnsignedEnum.FOO) self.assertIsInstance(e1, Const) self.assertEqual(e1.shape(), unsigned(2)) e2 = Value.cast(SignedEnum.FOO) self.assertIsInstance(e2, Const) self.assertEqual(e2.shape(), signed(2)) def test_cast_typedenum(self): e1 = Value.cast(TypedEnum.FOO) self.assertIsInstance(e1, Const) self.assertEqual(e1.shape(), unsigned(2)) def test_cast_enum_wrong(self): with self.assertRaisesRegex(TypeError, r"^Only enumerations whose members have constant-castable values can be used " r"in Amaranth code$"): Value.cast(StringEnum.FOO) def test_bool(self): with self.assertRaisesRegex(TypeError, r"^Attempted to convert Amaranth value to Python boolean$"): 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.stop, 1) s2 = Const(10)[-1] self.assertIsInstance(s2, Slice) self.assertEqual(s2.start, 3) self.assertEqual(s2.stop, 4) with self.assertRaisesRegex(IndexError, r"^Index 5 is out of bounds for a 4-bit value$"): Const(10)[5] def test_getitem_slice(self): s1 = Const(10)[1:3] self.assertIsInstance(s1, Slice) self.assertEqual(s1.start, 1) self.assertEqual(s1.stop, 3) s2 = Const(10)[1:-2] self.assertIsInstance(s2, Slice) self.assertEqual(s2.start, 1) self.assertEqual(s2.stop, 2) s3 = Const(31)[::2] self.assertIsInstance(s3, Cat) self.assertIsInstance(s3.parts[0], Slice) self.assertEqual(s3.parts[0].start, 0) self.assertEqual(s3.parts[0].stop, 1) self.assertIsInstance(s3.parts[1], Slice) self.assertEqual(s3.parts[1].start, 2) self.assertEqual(s3.parts[1].stop, 3) self.assertIsInstance(s3.parts[2], Slice) self.assertEqual(s3.parts[2].start, 4) self.assertEqual(s3.parts[2].stop, 5) def test_getitem_wrong(self): with self.assertRaisesRegex(TypeError, r"^Cannot index value with 'str'$"): Const(31)["str"] with self.assertRaisesRegex(TypeError, r"^Cannot index value with a value; use Value.bit_select\(\) instead$"): Const(31)[Signal(3)] s = Signal(3) with self.assertRaisesRegex(TypeError, r"^Cannot slice value with a value; use Value.bit_select\(\) or Value.word_select\(\) instead$"): Const(31)[s:s+3] def test_shift_left(self): self.assertRepr(Const(256, unsigned(9)).shift_left(0), "(cat (const 0'd0) (const 9'd256))") self.assertRepr(Const(256, unsigned(9)).shift_left(1), "(cat (const 1'd0) (const 9'd256))") self.assertRepr(Const(256, unsigned(9)).shift_left(5), "(cat (const 5'd0) (const 9'd256))") self.assertRepr(Const(256, signed(9)).shift_left(1), "(s (cat (const 1'd0) (const 9'sd-256)))") self.assertRepr(Const(256, signed(9)).shift_left(5), "(s (cat (const 5'd0) (const 9'sd-256)))") self.assertRepr(Const(256, unsigned(9)).shift_left(-1), "(slice (const 9'd256) 1:9)") self.assertRepr(Const(256, unsigned(9)).shift_left(-5), "(slice (const 9'd256) 5:9)") self.assertRepr(Const(256, signed(9)).shift_left(-1), "(s (slice (const 9'sd-256) 1:9))") self.assertRepr(Const(256, signed(9)).shift_left(-5), "(s (slice (const 9'sd-256) 5:9))") self.assertRepr(Const(256, signed(9)).shift_left(-15), "(s (slice (const 9'sd-256) 9:9))") def test_shift_left_wrong(self): with self.assertRaisesRegex(TypeError, r"^Shift amount must be an integer, not 'str'$"): Const(31).shift_left("str") def test_shift_right(self): self.assertRepr(Const(256, unsigned(9)).shift_right(0), "(slice (const 9'd256) 0:9)") self.assertRepr(Const(256, unsigned(9)).shift_right(-1), "(cat (const 1'd0) (const 9'd256))") self.assertRepr(Const(256, unsigned(9)).shift_right(-5), "(cat (const 5'd0) (const 9'd256))") self.assertRepr(Const(256, signed(9)).shift_right(-1), "(s (cat (const 1'd0) (const 9'sd-256)))") self.assertRepr(Const(256, signed(9)).shift_right(-5), "(s (cat (const 5'd0) (const 9'sd-256)))") self.assertRepr(Const(256, unsigned(9)).shift_right(1), "(slice (const 9'd256) 1:9)") self.assertRepr(Const(256, unsigned(9)).shift_right(5), "(slice (const 9'd256) 5:9)") self.assertRepr(Const(256, signed(9)).shift_right(1), "(s (slice (const 9'sd-256) 1:9))") self.assertRepr(Const(256, signed(9)).shift_right(5), "(s (slice (const 9'sd-256) 5:9))") self.assertRepr(Const(256, signed(9)).shift_right(15), "(s (slice (const 9'sd-256) 9:9))") def test_shift_right_wrong(self): with self.assertRaisesRegex(TypeError, r"^Shift amount must be an integer, not 'str'$"): Const(31).shift_left("str") def test_rotate_left(self): self.assertRepr(Const(256).rotate_left(1), "(cat (slice (const 9'd256) 8:9) (slice (const 9'd256) 0:8))") self.assertRepr(Const(256).rotate_left(7), "(cat (slice (const 9'd256) 2:9) (slice (const 9'd256) 0:2))") self.assertRepr(Const(256).rotate_left(-1), "(cat (slice (const 9'd256) 1:9) (slice (const 9'd256) 0:1))") self.assertRepr(Const(256).rotate_left(-7), "(cat (slice (const 9'd256) 7:9) (slice (const 9'd256) 0:7))") self.assertRepr(Const(0, 0).rotate_left(3), "(cat (slice (const 0'd0) 0:0) (slice (const 0'd0) 0:0))") self.assertRepr(Const(0, 0).rotate_left(-3), "(cat (slice (const 0'd0) 0:0) (slice (const 0'd0) 0:0))") def test_rotate_left_wrong(self): with self.assertRaisesRegex(TypeError, r"^Rotate amount must be an integer, not 'str'$"): Const(31).rotate_left("str") def test_rotate_right(self): self.assertRepr(Const(256).rotate_right(1), "(cat (slice (const 9'd256) 1:9) (slice (const 9'd256) 0:1))") self.assertRepr(Const(256).rotate_right(7), "(cat (slice (const 9'd256) 7:9) (slice (const 9'd256) 0:7))") self.assertRepr(Const(256).rotate_right(-1), "(cat (slice (const 9'd256) 8:9) (slice (const 9'd256) 0:8))") self.assertRepr(Const(256).rotate_right(-7), "(cat (slice (const 9'd256) 2:9) (slice (const 9'd256) 0:2))") self.assertRepr(Const(0, 0).rotate_right(3), "(cat (slice (const 0'd0) 0:0) (slice (const 0'd0) 0:0))") self.assertRepr(Const(0, 0).rotate_right(-3), "(cat (slice (const 0'd0) 0:0) (slice (const 0'd0) 0:0))") def test_rotate_right_wrong(self): with self.assertRaisesRegex(TypeError, r"^Rotate amount must be an integer, not 'str'$"): Const(31).rotate_right("str") def test_replicate_shape(self): s1 = Const(10).replicate(3) self.assertEqual(s1.shape(), unsigned(12)) self.assertIsInstance(s1.shape(), Shape) s2 = Const(10).replicate(0) self.assertEqual(s2.shape(), unsigned(0)) def test_replicate_count_wrong(self): with self.assertRaises(TypeError): Const(10).replicate(-1) with self.assertRaises(TypeError): Const(10).replicate("str") def test_replicate_repr(self): s = Const(10).replicate(3) self.assertEqual(repr(s), "(cat (const 4'd10) (const 4'd10) (const 4'd10))") class ConstTestCase(FHDLTestCase): def test_shape(self): self.assertEqual(Const(0).shape(), unsigned(1)) self.assertIsInstance(Const(0).shape(), Shape) self.assertEqual(Const(1).shape(), unsigned(1)) self.assertEqual(Const(10).shape(), unsigned(4)) self.assertEqual(Const(-10).shape(), signed(5)) self.assertEqual(Const(1, 4).shape(), unsigned(4)) self.assertEqual(Const(-1, 4).shape(), signed(4)) self.assertEqual(Const(1, signed(4)).shape(), signed(4)) self.assertEqual(Const(0, unsigned(0)).shape(), unsigned(0)) def test_shape_wrong(self): with self.assertRaisesRegex(TypeError, r"^Width of an unsigned value must be zero or a positive integer, not -1$"): Const(1, -1) def test_wrong_fencepost(self): with self.assertWarnsRegex(SyntaxWarning, r"^Value 10 equals the non-inclusive end of the constant shape " r"range\(0, 10\); this is likely an off-by-one error$"): Const(10, range(10)) def test_normalization(self): self.assertEqual(Const(0b10110, signed(5)).value, -10) self.assertEqual(Const(0b10000, signed(4)).value, 0) self.assertEqual(Const(-16, 4).value, 0) 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_bool(self): v = Const(0, 4).bool() self.assertEqual(repr(v), "(b (const 4'd0))") self.assertEqual(v.shape(), unsigned(1)) def test_invert(self): v = ~Const(0, 4) self.assertEqual(repr(v), "(~ (const 4'd0))") self.assertEqual(v.shape(), unsigned(4)) def test_as_unsigned(self): v = Const(-1, signed(4)).as_unsigned() self.assertEqual(repr(v), "(u (const 4'sd-1))") self.assertEqual(v.shape(), unsigned(4)) def test_as_signed(self): v = Const(1, unsigned(4)).as_signed() self.assertEqual(repr(v), "(s (const 4'd1))") self.assertEqual(v.shape(), signed(4)) def test_pos(self): self.assertRepr(+Const(10), "(const 4'd10)") def test_neg(self): v1 = -Const(0, unsigned(4)) self.assertEqual(repr(v1), "(- (const 4'd0))") self.assertEqual(v1.shape(), signed(5)) v2 = -Const(0, signed(4)) self.assertEqual(repr(v2), "(- (const 4'sd0))") self.assertEqual(v2.shape(), signed(5)) def test_add(self): v1 = Const(0, unsigned(4)) + Const(0, unsigned(6)) self.assertEqual(repr(v1), "(+ (const 4'd0) (const 6'd0))") self.assertEqual(v1.shape(), unsigned(7)) v2 = Const(0, signed(4)) + Const(0, signed(6)) self.assertEqual(v2.shape(), signed(7)) v3 = Const(0, signed(4)) + Const(0, unsigned(4)) self.assertEqual(v3.shape(), signed(6)) v4 = Const(0, unsigned(4)) + Const(0, signed(4)) self.assertEqual(v4.shape(), signed(6)) v5 = 10 + Const(0, 4) self.assertEqual(v5.shape(), unsigned(5)) def test_sub(self): v1 = Const(0, unsigned(4)) - Const(0, unsigned(6)) self.assertEqual(repr(v1), "(- (const 4'd0) (const 6'd0))") self.assertEqual(v1.shape(), signed(7)) v2 = Const(0, signed(4)) - Const(0, signed(6)) self.assertEqual(v2.shape(), signed(7)) v3 = Const(0, signed(4)) - Const(0, unsigned(4)) self.assertEqual(v3.shape(), signed(6)) v4 = Const(0, unsigned(4)) - Const(0, signed(4)) self.assertEqual(v4.shape(), signed(6)) v5 = 10 - Const(0, 4) self.assertEqual(v5.shape(), signed(5)) v6 = 1 - Const(2) self.assertEqual(v6.shape(), signed(3)) def test_mul(self): v1 = Const(0, unsigned(4)) * Const(0, unsigned(6)) self.assertEqual(repr(v1), "(* (const 4'd0) (const 6'd0))") self.assertEqual(v1.shape(), unsigned(10)) v2 = Const(0, signed(4)) * Const(0, signed(6)) self.assertEqual(v2.shape(), signed(10)) v3 = Const(0, signed(4)) * Const(0, unsigned(4)) self.assertEqual(v3.shape(), signed(8)) v5 = 10 * Const(0, 4) self.assertEqual(v5.shape(), unsigned(8)) def test_mod(self): v1 = Const(0, unsigned(4)) % Const(0, unsigned(6)) self.assertEqual(repr(v1), "(% (const 4'd0) (const 6'd0))") self.assertEqual(v1.shape(), unsigned(6)) v3 = Const(0, signed(4)) % Const(0, unsigned(4)) self.assertEqual(v3.shape(), unsigned(4)) v4 = Const(0, signed(4)) % Const(0, signed(6)) self.assertEqual(v4.shape(), signed(6)) v5 = 10 % Const(0, 4) self.assertEqual(v5.shape(), unsigned(4)) def test_floordiv(self): v1 = Const(0, unsigned(4)) // Const(0, unsigned(6)) self.assertEqual(repr(v1), "(// (const 4'd0) (const 6'd0))") self.assertEqual(v1.shape(), unsigned(4)) v3 = Const(0, signed(4)) // Const(0, unsigned(4)) self.assertEqual(v3.shape(), signed(4)) v4 = Const(0, signed(4)) // Const(0, signed(6)) self.assertEqual(v4.shape(), signed(5)) v5 = 10 // Const(0, 4) self.assertEqual(v5.shape(), unsigned(4)) def test_and(self): v1 = Const(0, unsigned(4)) & Const(0, unsigned(6)) self.assertEqual(repr(v1), "(& (const 4'd0) (const 6'd0))") self.assertEqual(v1.shape(), unsigned(6)) v2 = Const(0, signed(4)) & Const(0, signed(6)) self.assertEqual(v2.shape(), signed(6)) v3 = Const(0, signed(4)) & Const(0, unsigned(4)) self.assertEqual(v3.shape(), signed(5)) v4 = Const(0, unsigned(4)) & Const(0, signed(4)) self.assertEqual(v4.shape(), signed(5)) v5 = 10 & Const(0, 4) self.assertEqual(v5.shape(), unsigned(4)) def test_or(self): v1 = Const(0, unsigned(4)) | Const(0, unsigned(6)) self.assertEqual(repr(v1), "(| (const 4'd0) (const 6'd0))") self.assertEqual(v1.shape(), unsigned(6)) v2 = Const(0, signed(4)) | Const(0, signed(6)) self.assertEqual(v2.shape(), signed(6)) v3 = Const(0, signed(4)) | Const(0, unsigned(4)) self.assertEqual(v3.shape(), signed(5)) v4 = Const(0, unsigned(4)) | Const(0, signed(4)) self.assertEqual(v4.shape(), signed(5)) v5 = 10 | Const(0, 4) self.assertEqual(v5.shape(), unsigned(4)) def test_xor(self): v1 = Const(0, unsigned(4)) ^ Const(0, unsigned(6)) self.assertEqual(repr(v1), "(^ (const 4'd0) (const 6'd0))") self.assertEqual(v1.shape(), unsigned(6)) v2 = Const(0, signed(4)) ^ Const(0, signed(6)) self.assertEqual(v2.shape(), signed(6)) v3 = Const(0, signed(4)) ^ Const(0, unsigned(4)) self.assertEqual(v3.shape(), signed(5)) v4 = Const(0, unsigned(4)) ^ Const(0, signed(4)) self.assertEqual(v4.shape(), signed(5)) v5 = 10 ^ Const(0, 4) self.assertEqual(v5.shape(), unsigned(4)) def test_shl(self): v1 = Const(1, 4) << Const(4) self.assertEqual(repr(v1), "(<< (const 4'd1) (const 3'd4))") self.assertEqual(v1.shape(), unsigned(11)) def test_shl_wrong(self): with self.assertRaisesRegex(TypeError, r"^Shift amount must be unsigned$"): 1 << Const(0, signed(6)) with self.assertRaisesRegex(TypeError, r"^Shift amount must be unsigned$"): Const(1, unsigned(4)) << -1 def test_shr(self): v1 = Const(1, 4) >> Const(4) self.assertEqual(repr(v1), "(>> (const 4'd1) (const 3'd4))") self.assertEqual(v1.shape(), unsigned(4)) def test_shr_wrong(self): with self.assertRaisesRegex(TypeError, r"^Shift amount must be unsigned$"): 1 << Const(0, signed(6)) with self.assertRaisesRegex(TypeError, r"^Shift amount must be unsigned$"): Const(1, unsigned(4)) << -1 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(), unsigned(1)) 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(), unsigned(1)) 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(), unsigned(1)) 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(), unsigned(1)) 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(), unsigned(1)) 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(), unsigned(1)) def test_mux(self): s = Const(0) v1 = Mux(s, Const(0, unsigned(4)), Const(0, unsigned(6))) self.assertEqual(repr(v1), "(m (const 1'd0) (const 4'd0) (const 6'd0))") self.assertEqual(v1.shape(), unsigned(6)) v2 = Mux(s, Const(0, signed(4)), Const(0, signed(6))) self.assertEqual(v2.shape(), signed(6)) v3 = Mux(s, Const(0, signed(4)), Const(0, unsigned(4))) self.assertEqual(v3.shape(), signed(5)) v4 = Mux(s, Const(0, unsigned(4)), Const(0, signed(4))) self.assertEqual(v4.shape(), signed(5)) def test_mux_wide(self): s = Const(0b100) v = Mux(s, Const(0, unsigned(4)), Const(0, unsigned(6))) self.assertEqual(repr(v), "(m (const 3'd4) (const 4'd0) (const 6'd0))") def test_mux_bool(self): v = Mux(True, Const(0), Const(0)) self.assertEqual(repr(v), "(m (const 1'd1) (const 1'd0) (const 1'd0))") def test_any(self): v = Const(0b101).any() self.assertEqual(repr(v), "(r| (const 3'd5))") def test_all(self): v = Const(0b101).all() self.assertEqual(repr(v), "(r& (const 3'd5))") def test_xor_value(self): v = Const(0b101).xor() self.assertEqual(repr(v), "(r^ (const 3'd5))") def test_matches(self): s = Signal(4) self.assertRepr(s.matches(), "(const 1'd0)") self.assertRepr(s.matches(1), """ (== (sig s) (const 1'd1)) """) self.assertRepr(s.matches(0, 1), """ (r| (cat (== (sig s) (const 1'd0)) (== (sig s) (const 1'd1)))) """) self.assertRepr(s.matches("10--"), """ (== (& (sig s) (const 4'd12)) (const 4'd8)) """) self.assertRepr(s.matches("1 0--"), """ (== (& (sig s) (const 4'd12)) (const 4'd8)) """) def test_matches_enum(self): s = Signal(SignedEnum) self.assertRepr(s.matches(SignedEnum.FOO), """ (== (sig s) (const 2'sd-1)) """) def test_matches_const_castable(self): s = Signal(4) self.assertRepr(s.matches(Cat(C(0b10, 2), C(0b11, 2))), """ (== (sig s) (const 4'd14)) """) def test_matches_width_wrong(self): s = Signal(4) with self.assertRaisesRegex(SyntaxError, r"^Match pattern '--' must have the same width as match value \(which is 4\)$"): s.matches("--") with self.assertWarnsRegex(SyntaxWarning, r"^Match pattern '22' \(5'10110\) is wider than match value \(which has " r"width 4\); comparison will never be true$"): s.matches(0b10110) with self.assertWarnsRegex(SyntaxWarning, r"^Match pattern '\(cat \(const 1'd0\) \(const 4'd11\)\)' \(5'10110\) is wider " r"than match value \(which has width 4\); comparison will never be true$"): s.matches(Cat(0, C(0b1011, 4))) def test_matches_bits_wrong(self): s = Signal(4) with self.assertRaisesRegex(SyntaxError, r"^Match pattern 'abc' must consist of 0, 1, and - \(don't care\) bits, " r"and may include whitespace$"): s.matches("abc") def test_matches_pattern_wrong(self): s = Signal(4) with self.assertRaisesRegex(SyntaxError, r"^Match pattern must be a string or a constant-castable expression, not 1\.0$"): s.matches(1.0) def test_hash(self): with self.assertRaises(TypeError): hash(Const(0) + Const(0)) def test_abs(self): s = Signal(4) self.assertRepr(abs(s), """ (sig s) """) s = Signal(signed(4)) self.assertRepr(abs(s), """ (slice (m (>= (sig s) (const 1'd0)) (sig s) (- (sig s))) 0:4) """) self.assertEqual(abs(s).shape(), unsigned(4)) def test_contains(self): with self.assertRaisesRegex(TypeError, r"^Cannot use 'in' with an Amaranth value$"): 1 in Signal(3) class SliceTestCase(FHDLTestCase): def test_shape(self): s1 = Const(10)[2] self.assertEqual(s1.shape(), unsigned(1)) self.assertIsInstance(s1.shape(), Shape) s2 = Const(-10)[0:2] self.assertEqual(s2.shape(), unsigned(2)) def test_start_end_negative(self): c = Const(0, 8) s1 = Slice(c, 0, -1) self.assertEqual((s1.start, s1.stop), (0, 7)) s1 = Slice(c, -4, -1) self.assertEqual((s1.start, s1.stop), (4, 7)) def test_start_end_bool(self): c = Const(0, 8) s = Slice(c, False, True) self.assertIs(type(s.start), int) self.assertIs(type(s.stop), int) def test_start_end_wrong(self): with self.assertRaisesRegex(TypeError, r"^Slice start must be an integer, not 'x'$"): Slice(0, "x", 1) with self.assertRaisesRegex(TypeError, r"^Slice stop must be an integer, not 'x'$"): Slice(0, 1, "x") def test_start_end_out_of_range(self): c = Const(0, 8) with self.assertRaisesRegex(IndexError, r"^Cannot start slice 10 bits into 8-bit value$"): Slice(c, 10, 12) with self.assertRaisesRegex(IndexError, r"^Cannot stop slice 12 bits into 8-bit value$"): Slice(c, 0, 12) with self.assertRaisesRegex(IndexError, r"^Slice start 4 must be less than slice stop 2$"): Slice(c, 4, 2) with self.assertRaisesRegex(IndexError, r"^Cannot start slice -9 bits into 8-bit value$"): Slice(c, -9, -5) def test_repr(self): s1 = Const(10)[2] self.assertEqual(repr(s1), "(slice (const 4'd10) 2:3)") def test_const(self): a = Const.cast(Const(0x1234, 16)[4:12]) self.assertEqual(a.value, 0x23) self.assertEqual(a.width, 8) self.assertEqual(a.signed, False) a = Const.cast(Const(-4, signed(8))[1:6]) self.assertEqual(a.value, 0x1e) self.assertEqual(a.width, 5) self.assertEqual(a.signed, False) class BitSelectTestCase(FHDLTestCase): def setUp(self): self.c = Const(0, 8) self.s = Signal(range(self.c.width)) def test_shape(self): s1 = self.c.bit_select(self.s, 2) self.assertIsInstance(s1, Part) self.assertEqual(s1.shape(), unsigned(2)) self.assertIsInstance(s1.shape(), Shape) s2 = self.c.bit_select(self.s, 0) self.assertIsInstance(s2, Part) self.assertEqual(s2.shape(), unsigned(0)) def test_stride(self): s1 = self.c.bit_select(self.s, 2) self.assertIsInstance(s1, Part) self.assertEqual(s1.stride, 1) def test_const(self): s1 = self.c.bit_select(1, 2) self.assertIsInstance(s1, Slice) self.assertRepr(s1, """(slice (const 8'd0) 1:3)""") def test_width_wrong(self): with self.assertRaises(TypeError): self.c.bit_select(self.s, -1) def test_repr(self): s = self.c.bit_select(self.s, 2) self.assertEqual(repr(s), "(part (const 8'd0) (sig s) 2 1)") def test_offset_wrong(self): with self.assertRaisesRegex(TypeError, r"^Part offset must be unsigned$"): self.c.bit_select(self.s.as_signed(), 1) class WordSelectTestCase(FHDLTestCase): def setUp(self): self.c = Const(0, 8) self.s = Signal(range(self.c.width)) def test_shape(self): s1 = self.c.word_select(self.s, 2) self.assertIsInstance(s1, Part) self.assertEqual(s1.shape(), unsigned(2)) self.assertIsInstance(s1.shape(), Shape) def test_stride(self): s1 = self.c.word_select(self.s, 2) self.assertIsInstance(s1, Part) self.assertEqual(s1.stride, 2) def test_const(self): s1 = self.c.word_select(1, 2) self.assertIsInstance(s1, Slice) self.assertRepr(s1, """(slice (const 8'd0) 2:4)""") def test_width_wrong(self): with self.assertRaises(TypeError): self.c.word_select(self.s, 0) with self.assertRaises(TypeError): self.c.word_select(self.s, -1) def test_repr(self): s = self.c.word_select(self.s, 2) self.assertEqual(repr(s), "(part (const 8'd0) (sig s) 2 2)") def test_offset_wrong(self): with self.assertRaisesRegex(TypeError, r"^Part offset must be unsigned$"): self.c.word_select(self.s.as_signed(), 1) class CatTestCase(FHDLTestCase): def test_shape(self): c0 = Cat() self.assertEqual(c0.shape(), unsigned(0)) self.assertIsInstance(c0.shape(), Shape) c1 = Cat(Const(10)) self.assertEqual(c1.shape(), unsigned(4)) c2 = Cat(Const(10), Const(1)) self.assertEqual(c2.shape(), unsigned(5)) c3 = Cat(Const(10), Const(1), Const(0)) self.assertEqual(c3.shape(), unsigned(6)) def test_repr(self): c1 = Cat(Const(10), Const(1)) self.assertEqual(repr(c1), "(cat (const 4'd10) (const 1'd1))") def test_cast(self): c = Cat(1, 0) self.assertEqual(repr(c), "(cat (const 1'd1) (const 1'd0))") def test_str_wrong(self): with self.assertRaisesRegex(TypeError, r"^Object 'foo' cannot be converted to an Amaranth value$"): Cat("foo") def test_int_01(self): with warnings.catch_warnings(): warnings.filterwarnings(action="error", category=SyntaxWarning) Cat(0, 1, 1, 0) def test_enum_wrong(self): class Color(Enum): RED = 1 BLUE = 2 with self.assertWarnsRegex(SyntaxWarning, r"^Argument #1 of Cat\(\) is an enumerated value without " r"a defined shape used in bit vector context; define the enumeration by " r"inheriting from the class in amaranth\.lib\.enum and specifying " r"the 'shape=' keyword argument$"): c = Cat(Color.RED, Color.BLUE) self.assertEqual(repr(c), "(cat (const 2'd1) (const 2'd2))") def test_intenum_wrong(self): class Color(int, Enum): RED = 1 BLUE = 2 with self.assertWarnsRegex(SyntaxWarning, r"^Argument #1 of Cat\(\) is an enumerated value without " r"a defined shape used in bit vector context; define the enumeration by " r"inheriting from the class in amaranth\.lib\.enum and specifying " r"the 'shape=' keyword argument$"): c = Cat(Color.RED, Color.BLUE) self.assertEqual(repr(c), "(cat (const 2'd1) (const 2'd2))") def test_int_wrong(self): with self.assertWarnsRegex(SyntaxWarning, r"^Argument #1 of Cat\(\) is a bare integer 2 used in bit vector context; " r"specify the width explicitly using C\(2, 2\)$"): Cat(2) def test_const(self): a = Const.cast(Cat(Const(1, 1), Const(0, 1), Const(3, 2), Const(2, 2))) self.assertEqual(a.value, 0x2d) self.assertEqual(a.width, 6) self.assertEqual(a.signed, False) a = Const.cast(Cat(Const(-4, 8), Const(-3, 8))) self.assertEqual(a.value, 0xfdfc) self.assertEqual(a.width, 16) self.assertEqual(a.signed, False) class ReplTestCase(FHDLTestCase): @_ignore_deprecated def test_cast(self): r = Repl(0, 3) self.assertEqual(repr(r), "(cat (const 1'd0) (const 1'd0) (const 1'd0))") @_ignore_deprecated def test_int_01(self): with warnings.catch_warnings(): warnings.filterwarnings(action="error", category=SyntaxWarning) Repl(0, 3) Repl(1, 3) @_ignore_deprecated def test_int_wrong(self): with self.assertWarnsRegex(SyntaxWarning, r"^Value argument of Repl\(\) is a bare integer 2 used in bit vector context; " r"consider specifying explicit width using C\(2, 2\) instead$"): Repl(2, 3) class ArrayTestCase(FHDLTestCase): def test_acts_like_array(self): a = Array([1,2,3]) self.assertSequenceEqual(a, [1,2,3]) self.assertEqual(a[1], 2) a[1] = 4 self.assertSequenceEqual(a, [1,4,3]) del a[1] self.assertSequenceEqual(a, [1,3]) a.insert(1, 2) self.assertSequenceEqual(a, [1,2,3]) def test_becomes_immutable(self): a = Array([1,2,3]) s1 = Signal(range(len(a))) s2 = Signal(range(len(a))) v1 = a[s1] v2 = a[s2] with self.assertRaisesRegex(ValueError, r"^Array can no longer be mutated after it was indexed with a value at "): a[1] = 2 with self.assertRaisesRegex(ValueError, r"^Array can no longer be mutated after it was indexed with a value at "): del a[1] with self.assertRaisesRegex(ValueError, r"^Array can no longer be mutated after it was indexed with a value at "): a.insert(1, 2) def test_index_value_castable(self): class MyValue(ValueCastable): @ValueCastable.lowermethod def as_value(self): return Signal() def shape(): return unsigned(1) a = Array([1,2,3]) a[MyValue()] def test_repr(self): a = Array([1,2,3]) self.assertEqual(repr(a), "(array mutable [1, 2, 3])") s = Signal(range(len(a))) v = a[s] self.assertEqual(repr(a), "(array [1, 2, 3])") class ArrayProxyTestCase(FHDLTestCase): def test_index_shape(self): m = Array(Array(x * y for y in range(1, 4)) for x in range(1, 4)) a = Signal(range(3)) b = Signal(range(3)) v = m[a][b] self.assertEqual(v.shape(), unsigned(4)) def test_attr_shape(self): from collections import namedtuple pair = namedtuple("pair", ("p", "n")) a = Array(pair(i, -i) for i in range(10)) s = Signal(range(len(a))) v = a[s] self.assertEqual(v.p.shape(), unsigned(4)) self.assertEqual(v.n.shape(), signed(5)) def test_attr_shape_signed(self): # [unsigned(1), unsigned(1)] → unsigned(1) a1 = Array([1, 1]) v1 = a1[Const(0)] self.assertEqual(v1.shape(), unsigned(1)) # [signed(1), signed(1)] → signed(1) a2 = Array([-1, -1]) v2 = a2[Const(0)] self.assertEqual(v2.shape(), signed(1)) # [unsigned(1), signed(2)] → signed(2) a3 = Array([1, -2]) v3 = a3[Const(0)] self.assertEqual(v3.shape(), signed(2)) # [unsigned(1), signed(1)] → signed(2); 1st operand padded with sign bit! a4 = Array([1, -1]) v4 = a4[Const(0)] self.assertEqual(v4.shape(), signed(2)) # [unsigned(2), signed(1)] → signed(3); 1st operand padded with sign bit! a5 = Array([1, -1]) v5 = a5[Const(0)] self.assertEqual(v5.shape(), signed(2)) def test_repr(self): a = Array([1, 2, 3]) s = Signal(range(3)) v = a[s] self.assertEqual(repr(v), "(proxy (array [1, 2, 3]) (sig s))") class SignalTestCase(FHDLTestCase): def test_shape(self): s1 = Signal() self.assertEqual(s1.shape(), unsigned(1)) self.assertIsInstance(s1.shape(), Shape) s2 = Signal(2) self.assertEqual(s2.shape(), unsigned(2)) s3 = Signal(unsigned(2)) self.assertEqual(s3.shape(), unsigned(2)) s4 = Signal(signed(2)) self.assertEqual(s4.shape(), signed(2)) s5 = Signal(0) self.assertEqual(s5.shape(), unsigned(0)) s6 = Signal(range(16)) self.assertEqual(s6.shape(), unsigned(4)) s7 = Signal(range(4, 16)) self.assertEqual(s7.shape(), unsigned(4)) s8 = Signal(range(-4, 16)) self.assertEqual(s8.shape(), signed(5)) s9 = Signal(range(-20, 16)) self.assertEqual(s9.shape(), signed(6)) s10 = Signal(range(0)) self.assertEqual(s10.shape(), unsigned(0)) s11 = Signal(range(1)) self.assertEqual(s11.shape(), unsigned(1)) def test_shape_wrong(self): with self.assertRaisesRegex(TypeError, r"^Width of an unsigned value must be zero or a positive integer, not -10$"): 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_reset_enum(self): s1 = Signal(2, reset=UnsignedEnum.BAR) self.assertEqual(s1.reset, 2) with self.assertRaisesRegex(TypeError, r"^Reset value must be a constant-castable expression, " r"not $"): Signal(1, reset=StringEnum.FOO) def test_reset_const_castable(self): s1 = Signal(4, reset=Cat(Const(0, 1), Const(1, 1), Const(0, 2))) self.assertEqual(s1.reset, 2) def test_reset_shape_castable_const(self): class CastableFromHex(ShapeCastable): def as_shape(self): return unsigned(8) def __call__(self, value): return value def const(self, init): return int(init, 16) s1 = Signal(CastableFromHex(), reset="aa") self.assertEqual(s1.reset, 0xaa) with self.assertRaisesRegex(ValueError, r"^Constant returned by <.+?CastableFromHex.+?>\.const\(\) must have the shape " r"that it casts to, unsigned\(8\), and not unsigned\(1\)$"): Signal(CastableFromHex(), reset="01") def test_reset_shape_castable_enum_wrong(self): class EnumA(AmaranthEnum, shape=1): X = 1 with self.assertRaisesRegex(TypeError, r"^Reset value must be a constant initializer of $"): Signal(EnumA) # implied reset=0 def test_reset_signed_mismatch(self): with self.assertWarnsRegex(SyntaxWarning, r"^Reset value -2 is signed, but the signal shape is unsigned\(2\)$"): Signal(unsigned(2), reset=-2) def test_reset_wrong_too_wide(self): with self.assertWarnsRegex(SyntaxWarning, r"^Reset value 2 will be truncated to the signal shape unsigned\(1\)$"): Signal(unsigned(1), reset=2) with self.assertWarnsRegex(SyntaxWarning, r"^Reset value 1 will be truncated to the signal shape signed\(1\)$"): Signal(signed(1), reset=1) with self.assertWarnsRegex(SyntaxWarning, r"^Reset value -2 will be truncated to the signal shape signed\(1\)$"): Signal(signed(1), reset=-2) def test_reset_wrong_fencepost(self): with self.assertRaisesRegex(SyntaxError, r"^Reset value 10 equals the non-inclusive end of the signal shape " r"range\(0, 10\); this is likely an off-by-one error$"): Signal(range(0, 10), reset=10) with self.assertRaisesRegex(SyntaxError, r"^Reset value 0 equals the non-inclusive end of the signal shape " r"range\(0, 0\); this is likely an off-by-one error$"): Signal(range(0), reset=0) def test_reset_wrong_range(self): with self.assertRaisesRegex(SyntaxError, r"^Reset value 11 is not within the signal shape range\(0, 10\)$"): Signal(range(0, 10), reset=11) with self.assertRaisesRegex(SyntaxError, r"^Reset value 0 is not within the signal shape range\(1, 10\)$"): Signal(range(1, 10), reset=0) def test_attrs(self): s1 = Signal() self.assertEqual(s1.attrs, {}) s2 = Signal(attrs={"no_retiming": True}) self.assertEqual(s2.attrs, {"no_retiming": True}) def test_repr(self): s1 = Signal() self.assertEqual(repr(s1), "(sig s1)") def test_like(self): s1 = Signal.like(Signal(4)) self.assertEqual(s1.shape(), unsigned(4)) s2 = Signal.like(Signal(range(-15, 1))) self.assertEqual(s2.shape(), signed(5)) s3 = Signal.like(Signal(4, reset=0b111, reset_less=True)) self.assertEqual(s3.reset, 0b111) self.assertEqual(s3.reset_less, True) s4 = Signal.like(Signal(attrs={"no_retiming": True})) self.assertEqual(s4.attrs, {"no_retiming": True}) s5 = Signal.like(Signal(decoder=str)) self.assertEqual(s5.decoder, str) s6 = Signal.like(10) self.assertEqual(s6.shape(), unsigned(4)) s7 = [Signal.like(Signal(4))][0] self.assertEqual(s7.name, "$like") s8 = Signal.like(s1, name_suffix="_ff") self.assertEqual(s8.name, "s1_ff") def test_decoder(self): class Color(Enum): RED = 1 BLUE = 2 s = Signal(decoder=Color) self.assertEqual(s.decoder(1), "RED/1") self.assertEqual(s.decoder(3), "3") def test_enum(self): s1 = Signal(UnsignedEnum) self.assertEqual(s1.shape(), unsigned(2)) s2 = Signal(SignedEnum) self.assertEqual(s2.shape(), signed(2)) self.assertEqual(s2.decoder(SignedEnum.FOO), "FOO/-1") def test_const_wrong(self): s1 = Signal() with self.assertRaisesRegex(TypeError, r"^Value \(sig s1\) cannot be converted to an Amaranth constant$"): Const.cast(s1) class ClockSignalTestCase(FHDLTestCase): def test_domain(self): s1 = ClockSignal() self.assertEqual(s1.domain, "sync") s2 = ClockSignal("pix") self.assertEqual(s2.domain, "pix") with self.assertRaisesRegex(TypeError, r"^Clock domain name must be a string, not 1$"): ClockSignal(1) def test_shape(self): s1 = ClockSignal() self.assertEqual(s1.shape(), unsigned(1)) self.assertIsInstance(s1.shape(), Shape) def test_repr(self): s1 = ClockSignal() self.assertEqual(repr(s1), "(clk sync)") def test_wrong_name_comb(self): with self.assertRaisesRegex(ValueError, r"^Domain 'comb' does not have a clock$"): ClockSignal("comb") class ResetSignalTestCase(FHDLTestCase): def test_domain(self): s1 = ResetSignal() self.assertEqual(s1.domain, "sync") s2 = ResetSignal("pix") self.assertEqual(s2.domain, "pix") with self.assertRaisesRegex(TypeError, r"^Clock domain name must be a string, not 1$"): ResetSignal(1) def test_shape(self): s1 = ResetSignal() self.assertEqual(s1.shape(), unsigned(1)) self.assertIsInstance(s1.shape(), Shape) def test_repr(self): s1 = ResetSignal() self.assertEqual(repr(s1), "(rst sync)") def test_wrong_name_comb(self): with self.assertRaisesRegex(ValueError, r"^Domain 'comb' does not have a reset$"): ResetSignal("comb") class MockValueCastable(ValueCastable): def __init__(self, dest): self.dest = dest def shape(self): return Value.cast(self.dest).shape() @ValueCastable.lowermethod def as_value(self): return self.dest class MockValueCastableChanges(ValueCastable): def __init__(self, width=0): self.width = width def shape(self): return unsigned(self.width) @ValueCastable.lowermethod def as_value(self): return Signal(self.width) class MockValueCastableCustomGetattr(ValueCastable): def __init__(self): pass def shape(self): assert False @ValueCastable.lowermethod def as_value(self): return Const(0) def __getattr__(self, attr): assert False class ValueCastableTestCase(FHDLTestCase): def test_not_decorated(self): with self.assertRaisesRegex(TypeError, r"^Class 'MockValueCastableNotDecorated' deriving from `ValueCastable` must " r"decorate the `as_value` method with the `ValueCastable.lowermethod` decorator$"): class MockValueCastableNotDecorated(ValueCastable): def __init__(self): pass def shape(self): pass def as_value(self): return Signal() def test_no_override(self): with self.assertRaisesRegex(TypeError, r"^Class 'MockValueCastableNoOverrideAsValue' deriving from `ValueCastable` must " r"override the `as_value` method$"): class MockValueCastableNoOverrideAsValue(ValueCastable): def __init__(self): pass with self.assertRaisesRegex(TypeError, r"^Class 'MockValueCastableNoOverrideShapec' deriving from `ValueCastable` must " r"override the `shape` method$"): class MockValueCastableNoOverrideShapec(ValueCastable): def __init__(self): pass def as_value(self): return Signal() def test_memoized(self): vc = MockValueCastableChanges(1) sig1 = vc.as_value() vc.width = 2 sig2 = vc.as_value() self.assertIs(sig1, sig2) vc.width = 3 sig3 = Value.cast(vc) self.assertIs(sig1, sig3) def test_custom_getattr(self): vc = MockValueCastableCustomGetattr() vc.as_value() # shouldn't call __getattr__ def test_recurse_bad(self): vc = MockValueCastable(None) vc.dest = vc with self.assertRaisesRegex(RecursionError, r"^Value-castable object <.+> casts to itself$"): Value.cast(vc) def test_recurse(self): vc = MockValueCastable(MockValueCastable(Signal())) self.assertIsInstance(Value.cast(vc), Signal) class ValueLikeTestCase(FHDLTestCase): def test_construct(self): with self.assertRaises(TypeError): ValueLike() def test_subclass(self): self.assertTrue(issubclass(Value, ValueLike)) self.assertTrue(issubclass(MockValueCastable, ValueLike)) self.assertTrue(issubclass(int, ValueLike)) self.assertFalse(issubclass(range, ValueLike)) self.assertFalse(issubclass(EnumMeta, ValueLike)) self.assertTrue(issubclass(Enum, ValueLike)) self.assertFalse(issubclass(str, ValueLike)) self.assertTrue(issubclass(ValueLike, ValueLike)) def test_isinstance(self): self.assertTrue(isinstance(Const(0, 2), ValueLike)) self.assertTrue(isinstance(MockValueCastable(Const(0, 2)), ValueLike)) self.assertTrue(isinstance(2, ValueLike)) self.assertTrue(isinstance(-2, ValueLike)) self.assertFalse(isinstance(range(10), ValueLike)) def test_enum(self): class EnumA(Enum): A = 1 B = 2 class EnumB(Enum): A = "a" B = "b" class EnumC(Enum): A = Cat(Const(1, 2), Const(0, 2)) class EnumD(Enum): A = 1 B = "a" self.assertTrue(issubclass(EnumA, ValueLike)) self.assertFalse(issubclass(EnumB, ValueLike)) self.assertTrue(issubclass(EnumC, ValueLike)) self.assertFalse(issubclass(EnumD, ValueLike)) self.assertTrue(isinstance(EnumA.A, ValueLike)) self.assertFalse(isinstance(EnumB.A, ValueLike)) self.assertTrue(isinstance(EnumC.A, ValueLike)) self.assertFalse(isinstance(EnumD.A, ValueLike)) class InitialTestCase(FHDLTestCase): def test_initial(self): i = Initial() self.assertEqual(i.shape(), unsigned(1)) class SwitchTestCase(FHDLTestCase): def test_default_case(self): s = Switch(Const(0), {None: []}) self.assertEqual(s.cases, {(): []}) def test_int_case(self): s = Switch(Const(0, 8), {10: []}) self.assertEqual(s.cases, {("00001010",): []}) def test_int_neg_case(self): s = Switch(Const(0, 8), {-10: []}) self.assertEqual(s.cases, {("11110110",): []}) def test_enum_case(self): s = Switch(Const(0, UnsignedEnum), {UnsignedEnum.FOO: []}) self.assertEqual(s.cases, {("01",): []}) def test_str_case(self): s = Switch(Const(0, 8), {"0000 11\t01": []}) self.assertEqual(s.cases, {("00001101",): []}) def test_two_cases(self): s = Switch(Const(0, 8), {("00001111", 123): []}) self.assertEqual(s.cases, {("00001111", "01111011"): []})