Print when evaluating terminators.

ll.py

@@ -106,3 +106,25 @@ def insn2s(insn):
         # TODO
         print('insn2s: Unknown insn: {}'
               .format(insn))
+
+def terminator2s(terminator):
+    if isinstance(terminator, Ret):
+        if terminator.oper is None:
+            return ('ret {}'
+                    .format(ty2s(terminator.ty)))
+        else:
+            return ('ret {} {}'
+                    .format(ty2s(terminator.ty),
+                            oper2s(terminator.oper)))
+    elif isinstance(terminator, Br):
+        return ('br label %{}'
+                .format(terminator.label))
+    elif isinstance(terminator, Cbr):
+        return ('br {} {}, label %{}, label %{}'
+                .format(ty2s(terminator.ty),
+                        oper2s(terminator.oper),
+                        terminator.then_label,
+                        terminator.else_label))
+    else:
+        print('terminator2s: Unknown terminator {}'
+              .format(terminator))

stepper.py

@@ -69,12 +69,19 @@ def terminate(terminator, blocks, stack_frames, ssa_env, global_env, memory):
             if id is not None and id in ssa_env:
                 del ssa_env[id]
 
+    print('Evaluating {}'
+          .format(ll.terminator2s(terminator)))
+
     if isinstance(terminator, ll.Ret):
         oper = terminator.oper
         if oper is None:
             oper_v = None
         else:
             oper_v = eval_oper(oper, ssa_env, global_env)
+
+        # TODO
+        print('Returning {}'
+              .format(oper_v))
         if len(stack_frames) == 0:
             new_insns = []
             new_terminator = None
@@ -97,6 +104,7 @@ def terminate(terminator, blocks, stack_frames, ssa_env, global_env, memory):
         # blocks.
         clear_block_from_ssa_env(new_insns, ssa_env)
 
+        # TODO
         print('Jumping unconditionally to {}'
               .format(label))