task return

myhdl/_toVerilog.py

@@ -1243,12 +1243,14 @@ class _ConvertFunctionVisitor(_ConvertVisitor):
         self.indent()
         self.writeInputDeclarations()
         self.writeDeclarations()
+        self.dedent()
         self.writeline()
         self.write("begin: %s" % self.returnLabel)
+        self.indent()
         self.visit(node.code)
+        self.dedent()
         self.writeline()
         self.write("end")
-        self.dedent()
         self.writeline()
         self.write("endfunction")
         self.writeline(2)
@@ -1268,6 +1270,7 @@ class _ConvertTaskVisitor(_ConvertVisitor):
         self.argnames = ast.argnames
         self.inputs = ast.inputs
         self.outputs = ast.outputs
+        self.returnLabel = Label("RETURN")
 
 
     def writeInterfaceDeclarations(self):
@@ -1292,12 +1295,14 @@ class _ConvertTaskVisitor(_ConvertVisitor):
         self.indent()
         self.writeInterfaceDeclarations()
         self.writeDeclarations()
+        self.dedent()
         self.writeline()
         self.write("begin")
+        self.indent()
         self.visit(node.code)
+        self.dedent()
         self.writeline()
         self.write("end")
-        self.dedent()
         self.writeline()
         self.write("endtask")
         self.writeline(2)

myhdl/test/toVerilog/test_loops.py

@@ -74,6 +74,34 @@ def NestedForLoop2(a, out):
                         break
                 break
 
+def ReturnFromFunction(a):
+       for i in downrange(len(a)):
+            if a[i] == 1:
+                return i
+       return 0
+
+def FunctionCall(a, out):
+    while 1:
+        yield a
+        out.next = ReturnFromFunction(a)
+
+# During the following check, I noticed that non-blocking assignments
+# are not scheduled when a task is disabled in Icarus. Apparently
+# this is one of the many vague areas in the Verilog standard.
+def ReturnFromTask(a, out):
+    for i in downrange(len(a)):
+        if a[i] == 1:
+            out[:] = i
+            return
+    out[:] = 23 # to notice it
+
+def TaskCall(a, out):
+    var = intbv()[8:]
+    while 1:
+        yield a
+        ReturnFromTask(a, var)
+        out.next = var
+
 def WhileLoop(a, out):
     while 1:
         yield a
@@ -138,7 +166,7 @@ class TestLoops(unittest.TestCase):
 
     def bench(self, LoopTest):
         
-        a = Signal(intbv(0)[16:])
+        a = Signal(intbv(-1)[16:])
         out_v = Signal(intbv(0)[16:])
         out = Signal(intbv(0)[16:])
 
@@ -150,50 +178,62 @@ class TestLoops(unittest.TestCase):
             for i in range(100):
                 a.next = randrange(2**min(i, 16))
                 yield delay(10)
-                print "%s %s" % (out, out_v)
+                # print "%s %s" % (out, out_v)
                 self.assertEqual(out, out_v)
 
         return stimulus(), looptest_inst, looptest_v_inst
 
-##     def testForLoop(self):
-##         sim = self.bench(ForLoop)
-##         Simulation(sim).run()
+    def testForLoop(self):
+        sim = self.bench(ForLoop)
+        Simulation(sim).run()
         
-##     def testForContinueLoop(self):
-##         sim = self.bench(ForContinueLoop)
-##         Simulation(sim).run()
+    def testForContinueLoop(self):
+        sim = self.bench(ForContinueLoop)
+        Simulation(sim).run()
         
-##     def testForBreakLoop(self):
-##         sim = self.bench(ForBreakLoop)
-##         Simulation(sim).run()
+    def testForBreakLoop(self):
+        sim = self.bench(ForBreakLoop)
+        Simulation(sim).run()
         
-##     def testForBreakContinueLoop(self):
-##         sim = self.bench(ForBreakContinueLoop)
-##         Simulation(sim).run()
+    def testForBreakContinueLoop(self):
+        sim = self.bench(ForBreakContinueLoop)
+        Simulation(sim).run()
         
-##     def testNestedForLoop1(self):
-##         sim = self.bench(NestedForLoop1)
-##         Simulation(sim).run()
+    def testNestedForLoop1(self):
+        sim = self.bench(NestedForLoop1)
+        Simulation(sim).run()
         
     def testNestedForLoop2(self):
         sim = self.bench(NestedForLoop2)
         Simulation(sim).run()
         
-##     def testWhileLoop(self):
-##         sim = self.bench(WhileLoop)
-##         Simulation(sim).run()
+    def testNestedForLoop2(self):
+        sim = self.bench(NestedForLoop2)
+        Simulation(sim).run()
 
-##     def testWhileContinueLoop(self):
-##         sim = self.bench(WhileContinueLoop)
-##         Simulation(sim).run()
+    def testFunctionCall(self):
+        sim = self.bench(FunctionCall)
+        Simulation(sim).run()
         
-##     def testWhileBreakLoop(self):
-##         sim = self.bench(WhileBreakLoop)
-##         Simulation(sim).run()
+    def testTaskCall(self):
+        sim = self.bench(TaskCall)
+        Simulation(sim).run()
        
-##     def testWhileBreakContinueLoop(self):
-##         sim = self.bench(WhileBreakContinueLoop)
-##         Simulation(sim).run()
+    def testWhileLoop(self):
+        sim = self.bench(WhileLoop)
+        Simulation(sim).run()
+
+    def testWhileContinueLoop(self):
+        sim = self.bench(WhileContinueLoop)
+        Simulation(sim).run()
+
+    def testWhileBreakLoop(self):
+        sim = self.bench(WhileBreakLoop)
+        Simulation(sim).run()
+        
+    def testWhileBreakContinueLoop(self):
+        sim = self.bench(WhileBreakContinueLoop)
+        Simulation(sim).run()
 
         
 if __name__ == '__main__':