test: add test for asic_syntax

migen/test/asic_syntax.py

@@ -0,0 +1,58 @@
+import unittest
+import subprocess
+import os
+
+from migen.fhdl.std import *
+from migen.fhdl.verilog import convert
+
+
+# Create a module with some combinatorial, some sequential, and some simple assigns
+class ThingBlock(Module):
+    def __init__(self):
+        x = [Signal(8) for y in range(10)]
+        y = [Signal(8) for z in range(10)]
+        en = Signal()
+        a = Signal()
+        b = Signal()
+        z = Signal()
+        as_src = Signal(16);
+        as_tgt1 = Signal(16);
+        as_tgt2 = Signal(16);
+        self.io = {a, b, z, en, as_src, as_tgt1, as_tgt2}
+
+        self.comb += If(a, z.eq(b))
+        self.comb += as_tgt1.eq(as_src)
+        self.comb += as_tgt2.eq(100)
+        for xi in x:
+            self.io.add(xi)
+        for xi in range(1, len(x)):
+            self.comb += If(en, y[xi].eq(x[xi-1])).Else(y[xi].eq(x[xi]))
+            self.sync += x[xi].eq(y[xi])
+
+
+# Create unit test to build module, run Verilator and check for errors
+class TestThingBlock(unittest.TestCase):
+    def test_mode_true(self):
+        filename = "test_module_true.v"
+        t = ThingBlock()
+        with open(filename, "w") as fh:
+            fh.write("/* verilator lint_off WIDTH */\n")
+            fh.write(str(convert(t, t.io, name="test_module",
+                                 asic_syntax=True)))
+
+        subprocess.check_call("verilator --lint-only " + filename,
+                              stdout=subprocess.DEVNULL,
+                              stderr=subprocess.DEVNULL, shell=True)
+        os.unlink(filename)
+
+    def test_mode_false(self):
+        filename = "test_module_false.v"
+        t = ThingBlock()
+        with open(filename, "w") as fh:
+            fh.write(str(convert(t, t.io, name="test_module")))
+
+        with self.assertRaises(subprocess.CalledProcessError):
+            subprocess.check_call("verilator --lint-only " + filename,
+                                  stdout=subprocess.DEVNULL,
+                                  stderr=subprocess.DEVNULL, shell=True)
+        os.unlink(filename)