Add simple function-tracing support. Prints a message

every time the committed PC changes from one symbol scope
to another.
Set function_trace=y on target CPU to enable.
To defer start, use function_trace_start=<tick>
(in addition to setting function_trace=y).

cpu/base_cpu.cc:
cpu/base_cpu.hh:
    Add simple function-tracing support.
cpu/simple_cpu/simple_cpu.cc:
    Add function_trace, function_trace_start params
    Call traceFunctions() on instruction completion
cpu/simple_cpu/simple_cpu.hh:
    Add function_trace, function_trace_start params

--HG--
extra : convert_revision : 8a7f84028ccbaee585253629007f32fc8eae35e1

1 files changed, 22 insertions, 3 deletions

diff --git a/cpu/base_cpu.hh b/cpu/base_cpu.hh
index 8668c3216..baa956aa8 100644
--- a/cpu/base_cpu.hh
+++ b/cpu/base_cpu.hh
@@ -95,16 +95,18 @@ class BaseCPU : public SimObject
     BaseCPU(const std::string &_name, int _number_of_threads, bool _def_reg,
             Counter max_insts_any_thread, Counter max_insts_all_threads,
             Counter max_loads_any_thread, Counter max_loads_all_threads,
-            System *_system, Tick freq);
+            System *_system, Tick freq,
+            bool _function_trace = false, Tick _function_trace_start = 0);
 #else
     BaseCPU(const std::string &_name, int _number_of_threads, bool _def_reg,
             Counter max_insts_any_thread = 0,
             Counter max_insts_all_threads = 0,
             Counter max_loads_any_thread = 0,
-            Counter max_loads_all_threads = 0);
+            Counter max_loads_all_threads = 0,
+            bool _function_trace = false, Tick _function_trace_start = 0);
 #endif
 
-    virtual ~BaseCPU() {}
+    virtual ~BaseCPU();
 
     virtual void init();
     virtual void regStats();
@@ -166,6 +168,23 @@ class BaseCPU : public SimObject
 
     virtual Counter totalInstructions() const { return 0; }
 
+    // Function tracing
+  private:
+    bool functionTracingEnabled;
+    std::ostream *functionTraceStream;
+    Addr currentFunctionStart;
+    Addr currentFunctionEnd;
+    Tick functionEntryTick;
+    void enableFunctionTrace();
+    void traceFunctionsInternal(Addr pc);
+
+  protected:
+    void traceFunctions(Addr pc)
+    {
+        if (functionTracingEnabled)
+            traceFunctionsInternal(pc);
+    }
+
   private:
     static std::vector<BaseCPU *> cpuList;   //!< Static global cpu list