fhdl/namer: simplify + more relevant names

migen/fhdl/namer.py

@@ -2,11 +2,11 @@ from itertools import combinations
 
 from migen.fhdl.structure import *
 
-class _StepNamer():
+class _StepNamer:
 	def __init__(self):
 		self.name_to_ids = {}
 	
-	def context_prefix(self, obj):
+	def get_step_str(self, obj):
 		if isinstance(obj, str):
 			return obj
 		else:
@@ -24,40 +24,15 @@ class _StepNamer():
 					l.append(id(obj))
 				return n + str(idx)
 
-	def name(self, with_context_prefix, step):
-		if with_context_prefix or step[1] is None:
-			n = self.context_prefix(step[0])
-			if step[1] is not None:
-				n += "_" + step[1]
-		else:
-			n = step[1]
-		return n
-
-# Returns True if we should include the context prefix
-def _choose_strategy(objs):
-	id_with_name = {}
-	for obj in objs:
-		if not isinstance(obj, str):
-			n = obj.__class__.__name__.lower()
-			try:
-				existing_id = id_with_name[n]
-			except KeyError:
-				id_with_name[n] = id(obj)
-			else:
-				if existing_id != id(obj):
-					return True
-	return False
-
 def _bin(sn, sig_iters):
 	status = []
 	for signal, it in sig_iters:
 		step, last = next(it)
 		status.append((signal, it, step, last))
-	with_context_prefix = _choose_strategy(step[0] for signal, it, step, last in status)
 	terminals = []
 	bins = {}
 	for signal, it, step, last in status:
-		step_name = sn.name(with_context_prefix, step)
+		step_name = sn.get_step_str(step)
 		if last:
 			terminals.append((step_name, signal))
 		else:

migen/fhdl/structure.py

@@ -168,7 +168,7 @@ class Signal(Value):
 		return id(self)
 	
 	def __repr__(self):
-		return "<Signal " + (self.backtrace[-1][1] or "anonymous") + ">"
+		return "<Signal " + (self.backtrace[-1] or "anonymous") + ">"
 
 # statements
 

migen/fhdl/tracer.py

@@ -42,7 +42,9 @@ def trace_back(name=None):
 		
 		if name is None:
 			name = get_var_name(frame)
-		l.insert(0, (obj, name))
+		if name is not None:
+			l.insert(0, name)
+		l.insert(0, obj)
 		name = None
 		frame = frame.f_back
 	return l