diff --git a/lib/ExecutionEngine/Interpreter/Execution.cpp b/lib/ExecutionEngine/Interpreter/Execution.cpp
index a7ded5b..1d7ec7a 100644
--- a/lib/ExecutionEngine/Interpreter/Execution.cpp
+++ b/lib/ExecutionEngine/Interpreter/Execution.cpp
@@ -834,6 +834,9 @@
   ExecutionContext &SF = ECStack.back();  // Current stack frame
   Instruction *I = *SF.CurInst++;         // Increment before execute
 
+  if (Trace)
+    cout << "Run:" << I;
+
   if (I->isBinaryOp()) {
     executeBinaryInst((BinaryOperator*)I, SF);
   } else {
diff --git a/lib/ExecutionEngine/Interpreter/Interpreter.h b/lib/ExecutionEngine/Interpreter/Interpreter.h
index 16cc569..2d262ae 100644
--- a/lib/ExecutionEngine/Interpreter/Interpreter.h
+++ b/lib/ExecutionEngine/Interpreter/Interpreter.h
@@ -56,6 +56,7 @@
   Module *CurMod;              // The current Module being executed (0 if none)
   int ExitCode;                // The exit code to be returned by the lli util
   bool Profile;                // Profiling enabled?
+  bool Trace;                  // Tracing enabled?
   int CurFrame;                // The current stack frame being inspected
 
   // The runtime stack of executing code.  The top of the stack is the current
@@ -72,6 +73,7 @@
 
   // enableProfiling() - Turn profiling on, clear stats?
   void enableProfiling() { Profile = true; }
+  void enableTracing() { Trace = true; }
 
   void initializeExecutionEngine();
   void handleUserInput();
diff --git a/lib/ExecutionEngine/Interpreter/UserInput.cpp b/lib/ExecutionEngine/Interpreter/UserInput.cpp
index a24b311..97bba9c 100644
--- a/lib/ExecutionEngine/Interpreter/UserInput.cpp
+++ b/lib/ExecutionEngine/Interpreter/UserInput.cpp
@@ -16,7 +16,8 @@
   Print, Info, List, StackTrace, Up, Down,    // Inspection
   Next, Step, Run, Finish, Call,              // Control flow changes
   Break, Watch,                               // Debugging
-  Load, Flush
+  Load, Flush,
+  TraceOpt, ProfileOpt                              // Toggle features
 };
 
 // CommandTable - Build a lookup table for the commands available to the user...
@@ -52,6 +53,9 @@
 
   { "load"     , Load       },
   { "flush"    , Flush      },
+
+  { "trace"    , TraceOpt   },
+  { "profile"  , ProfileOpt },
 };
 static CommandTableElement *CommandTableEnd = 
    CommandTable+sizeof(CommandTable)/sizeof(CommandTable[0]);
@@ -118,6 +122,16 @@
       finish();               // Run until it's complete
       break;
 
+    case TraceOpt:
+      Trace = !Trace;
+      cout << "Tracing " << (Trace ? "enabled\n" : "disabled\n");
+      break;
+
+    case ProfileOpt:
+      Profile = !Profile;
+      cout << "Profiling " << (Trace ? "enabled\n" : "disabled\n");
+      break;
+
     default:
       cout << "Command '" << Command << "' unimplemented!\n";
       break;