snes: cpu tracelogging. <1% extra overhead incurred when the tracer is not active.

BizHawk.Emulation/Consoles/Nintendo/SNES/LibsnesCore.cs

@@ -79,6 +79,8 @@ namespace BizHawk.Emulation.Consoles.Nintendo.SNES
 		public delegate void snes_scanlineStart_t(int line);
 		[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
 		public delegate string snes_path_request_t(int slot, string hint);
+		[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
+		public delegate void snes_trace_t(string msg);
 
 		[DllImport("libsneshawk.dll", CallingConvention = CallingConvention.Cdecl)]
 		public static extern void snes_set_video_refresh(snes_video_refresh_t video_refresh);
@@ -132,6 +134,9 @@ namespace BizHawk.Emulation.Consoles.Nintendo.SNES
 		[DllImport("libsneshawk.dll", CallingConvention = CallingConvention.Cdecl)]
 		public static extern void snes_dequeue_message(IntPtr strBuffer);
 
+		[DllImport("libsneshawk.dll", CallingConvention = CallingConvention.Cdecl)]
+		public static extern void snes_set_trace_callback(snes_trace_t callback);
+
 		[DllImport("libsneshawk.dll", CallingConvention = CallingConvention.Cdecl)]
 		public static extern void snes_set_color_lut(IntPtr colors);
 
@@ -394,6 +399,11 @@ namespace BizHawk.Emulation.Consoles.Nintendo.SNES
 			return test;
 		}
 
+		void snes_trace(string msg)
+		{
+			CoreInputComm.Tracer.Put(msg);
+		}
+
 		public SnesColors.ColorType CurrPalette { get; private set; }
 
 		public void SetPalette(SnesColors.ColorType pal)
@@ -439,9 +449,10 @@ namespace BizHawk.Emulation.Consoles.Nintendo.SNES
 			pathRequest_cb = new LibsnesDll.snes_path_request_t(snes_path_request);
 			BizHawk.Emulation.Consoles.Nintendo.SNES.LibsnesDll.snes_set_path_request(pathRequest_cb);
 
-
 			scanlineStart_cb = new LibsnesDll.snes_scanlineStart_t(snes_scanlineStart);
 
+			tracecb = new LibsnesDll.snes_trace_t(snes_trace);
+
 			// set default palette. Should be overridden by frontend probably
 			SetPalette(SnesColors.ColorType.BizHawk);
 
@@ -483,6 +494,8 @@ namespace BizHawk.Emulation.Consoles.Nintendo.SNES
 				CoreOutputComm.VsyncDen = 1;
 			}
 
+			CoreOutputComm.CpuTraceAvailable = true;
+
 			LibsnesDll.snes_power();
 
 			SetupMemoryDomains(romData);
@@ -509,6 +522,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo.SNES
 		LibsnesDll.snes_audio_sample_t soundcb;
 		LibsnesDll.snes_scanlineStart_t scanlineStart_cb;
 		LibsnesDll.snes_path_request_t pathRequest_cb;
+		LibsnesDll.snes_trace_t tracecb;
 
 		ushort snes_input_state(int port, int device, int index, int id)
 		{
@@ -628,6 +642,11 @@ namespace BizHawk.Emulation.Consoles.Nintendo.SNES
 				savestatebuff = ms.ToArray();
 			}
 
+			if (!nocallbacks && CoreInputComm.Tracer.Enabled)
+				LibsnesDll.snes_set_trace_callback(tracecb);
+			else
+				LibsnesDll.snes_set_trace_callback(null);
+
 			// speedup when sound rendering is not needed
 			if (!rendersound)
 				LibsnesDll.snes_set_audio_sample(null);
@@ -1039,9 +1058,6 @@ namespace BizHawk.Emulation.Consoles.Nintendo.SNES
 		public IList<MemoryDomain> MemoryDomains { get; private set; }
 		public MemoryDomain MainMemory { get; private set; }
 
-
-
-
 		#region audio stuff
 
 		Sound.Utilities.SpeexResampler resampler;

libsnes/bsnes/snes/cpu/cpu.cpp

@@ -86,7 +86,15 @@ void CPU::enter() {
 
 void CPU::op_step() {
   debugger.op_exec(regs.pc.d);
-
+  
+  if (interface->wanttrace)
+  {
+    char tmp[512];
+	disassemble_opcode(tmp, regs.pc.d);
+	tmp[511] = 0;
+    interface->cpuTrace(tmp);
+  }
+  
   (this->*opcode_table[op_readpc()])();
 }
 

libsnes/bsnes/snes/interface/interface.cpp

@@ -34,6 +34,9 @@ time_t Interface::randomSeed()
 int Interface::getBackdropColor()
 {
 	return -1;
+}
+
+void Interface::cpuTrace(const char *msg) {
 }
 
 }

libsnes/bsnes/snes/interface/interface.hpp

@@ -10,11 +10,14 @@ struct Interface {
   virtual time_t currentTime();
   virtual time_t randomSeed();
 
-	//zero 27-sep-2012
-	virtual void scanlineStart(int line) = 0;
+  //zero 27-sep-2012
+  virtual void scanlineStart(int line) = 0;
 
-	//zero 17-oct-2012
-	virtual int getBackdropColor();
+  //zero 17-oct-2012
+  virtual int getBackdropColor();
+  
+  bool wanttrace = false;
+  virtual void cpuTrace(const char *msg);
 };
 
 extern Interface *interface;

libsnes/bsnes/target-libsnes/libsnes.cpp

@@ -14,7 +14,8 @@ struct Interface : public SNES::Interface {
   snes_input_poll_t pinput_poll;
   snes_input_state_t pinput_state;
   snes_input_notify_t pinput_notify;
-	snes_path_request_t ppath_request;
+  snes_path_request_t ppath_request;
+  snes_trace_t ptrace;
   string basename;
   uint32_t *buffer;
   uint32_t *palette;
@@ -74,6 +75,11 @@ struct Interface : public SNES::Interface {
   void message(const string &text) {
 		messages.push(text);
   }
+  
+  void cpuTrace(const char *msg) {
+    if (ptrace)
+	  ptrace((const char *)msg);
+  }
 
   string path(SNES::Cartridge::Slot slot, const string &hint)
 	{
@@ -93,7 +99,8 @@ struct Interface : public SNES::Interface {
 			pinput_state(0), 
 			pinput_notify(0), 
 			ppath_request(0),
-			backdropColor(-1)
+			backdropColor(-1),
+			ptrace(0)
 	{
     buffer = new uint32_t[512 * 480];
     palette = new uint32_t[16 * 32768];
@@ -582,4 +589,18 @@ void snes_dequeue_message(char* buffer)
 void snes_set_backdropColor(int color)
 {
 	interface.backdropColor = color;
-}
+}
+
+void snes_set_trace_callback(snes_trace_t callback)
+{
+  if (callback)
+  {
+    interface.wanttrace = true;
+	interface.ptrace = callback;
+  }
+  else
+  {
+    interface.wanttrace = false;
+	interface.ptrace = 0;
+  }
+}

libsnes/bsnes/target-libsnes/libsnes.hpp

@@ -72,6 +72,7 @@ typedef void (*snes_audio_sample_t)(uint16_t left, uint16_t right);
 typedef void (*snes_input_poll_t)(void);
 typedef int16_t (*snes_input_state_t)(unsigned port, unsigned device, unsigned index, unsigned id);
 typedef void (*snes_input_notify_t)(int index);
+typedef void (*snes_trace_t)(const char *msg);
 
 const char* snes_library_id(void);
 unsigned snes_library_revision_major(void);
@@ -145,6 +146,8 @@ void snes_set_path_request(snes_path_request_t path_request);
 
 void snes_set_color_lut(uint32_t * colors);
 
+void snes_set_trace_callback(void (*callback)(const char *));
+
 // system bus implementation
 uint8_t bus_read(unsigned addr);
 void bus_write(unsigned addr, uint8_t val);