/****************************************************************************
*                                                                           *
* Project 64 - A Nintendo 64 emulator.                                      *
* http://www.pj64-emu.com/                                                  *
* Copyright (C) 2012 Project64. All rights reserved.                        *
*                                                                           *
* License:                                                                  *
* GNU/GPLv2 http://www.gnu.org/licenses/gpl-2.0.html                        *
*                                                                           *
****************************************************************************/
#include "stdafx.h"

R4300iOp::Func * CInterpreterCPU::m_R4300i_Opcode = NULL;

void ExecuteInterpreterOps (DWORD /*Cycles*/)
{
	g_Notify->BreakPoint(__FILEW__,__LINE__);
}

bool DelaySlotEffectsCompare (DWORD PC, DWORD Reg1, DWORD Reg2)
{
	OPCODE Command;

	if (!g_MMU->LW_VAddr(PC + 4, Command.Hex))
	{
		//g_Notify->DisplayError(L"Failed to load word 2");
		//ExitThread(0);
		return true;
	}

	switch (Command.op)
	{
	case R4300i_SPECIAL:
		switch (Command.funct)
		{
		case R4300i_SPECIAL_SLL:
		case R4300i_SPECIAL_SRL:
		case R4300i_SPECIAL_SRA:
		case R4300i_SPECIAL_SLLV:
		case R4300i_SPECIAL_SRLV:
		case R4300i_SPECIAL_SRAV:
		case R4300i_SPECIAL_MFHI:
		case R4300i_SPECIAL_MTHI:
		case R4300i_SPECIAL_MFLO:
		case R4300i_SPECIAL_MTLO:
		case R4300i_SPECIAL_DSLLV:
		case R4300i_SPECIAL_DSRLV:
		case R4300i_SPECIAL_DSRAV:
		case R4300i_SPECIAL_ADD:
		case R4300i_SPECIAL_ADDU:
		case R4300i_SPECIAL_SUB:
		case R4300i_SPECIAL_SUBU:
		case R4300i_SPECIAL_AND:
		case R4300i_SPECIAL_OR:
		case R4300i_SPECIAL_XOR:
		case R4300i_SPECIAL_NOR:
		case R4300i_SPECIAL_SLT:
		case R4300i_SPECIAL_SLTU:
		case R4300i_SPECIAL_DADD:
		case R4300i_SPECIAL_DADDU:
		case R4300i_SPECIAL_DSUB:
		case R4300i_SPECIAL_DSUBU:
		case R4300i_SPECIAL_DSLL:
		case R4300i_SPECIAL_DSRL:
		case R4300i_SPECIAL_DSRA:
		case R4300i_SPECIAL_DSLL32:
		case R4300i_SPECIAL_DSRL32:
		case R4300i_SPECIAL_DSRA32:
			if (Command.rd == 0)
			{
				return false;
			}
			if (Command.rd == Reg1 || Command.rd == Reg2)
			{
				return true;
			}
			break;
		case R4300i_SPECIAL_MULT:
		case R4300i_SPECIAL_MULTU:
		case R4300i_SPECIAL_DIV:
		case R4300i_SPECIAL_DIVU:
		case R4300i_SPECIAL_DMULT:
		case R4300i_SPECIAL_DMULTU:
		case R4300i_SPECIAL_DDIV:
		case R4300i_SPECIAL_DDIVU:
			break;
		default:
			if (g_Settings->LoadBool(Debugger_Enabled)) 
			{
				g_Notify->DisplayError(L"Does %s effect Delay slot at %X?",R4300iOpcodeName(Command.Hex,PC+4), PC);
			}
			return true;
		}
		break;
	case R4300i_CP0:
		switch (Command.rs)
		{
		case R4300i_COP0_MT: break;
		case R4300i_COP0_MF:
			if (Command.rt == 0)
			{
				return false;
			}
			if (Command.rt == Reg1 || Command.rt == Reg2)
			{
				return true;
			}
			break;
		default:
			if ( (Command.rs & 0x10 ) != 0 )
			{
				switch (Command.funct)
				{
				case R4300i_COP0_CO_TLBR: break;
				case R4300i_COP0_CO_TLBWI: break;
				case R4300i_COP0_CO_TLBWR: break;
				case R4300i_COP0_CO_TLBP: break;
				default: 
					if (g_Settings->LoadBool(Debugger_Enabled)) 
					{
						g_Notify->DisplayError(L"Does %s effect Delay slot at %X?\n6",R4300iOpcodeName(Command.Hex,PC+4), PC);
					}
					return true;
				}
			}
			else
			{
				if (g_Settings->LoadBool(Debugger_Enabled)) 
				{
					g_Notify->DisplayError(L"Does %s effect Delay slot at %X?\n7",R4300iOpcodeName(Command.Hex,PC+4), PC);
				}
				return true;
			}
		}
		break;
	case R4300i_CP1:
		switch (Command.fmt)
		{
		case R4300i_COP1_MF:
			if (Command.rt == 0)
			{
				return false;
			}
			if (Command.rt == Reg1 || Command.rt == Reg2)
			{
				return true;
			}
			break;
		case R4300i_COP1_CF: break;
		case R4300i_COP1_MT: break;
		case R4300i_COP1_CT: break;
		case R4300i_COP1_S: break;
		case R4300i_COP1_D: break;
		case R4300i_COP1_W: break;
		case R4300i_COP1_L: break;
		default:
			if (g_Settings->LoadBool(Debugger_Enabled)) 
			{
				g_Notify->DisplayError(L"Does %s effect Delay slot at %X?",R4300iOpcodeName(Command.Hex,PC+4), PC);
			}
			return true;
		}
		break;
	case R4300i_ANDI:
	case R4300i_ORI:
	case R4300i_XORI:
	case R4300i_LUI:
	case R4300i_ADDI:
	case R4300i_ADDIU:
	case R4300i_SLTI:
	case R4300i_SLTIU:
	case R4300i_DADDI:
	case R4300i_DADDIU:
	case R4300i_LB:
	case R4300i_LH:
	case R4300i_LW:
	case R4300i_LWL:
	case R4300i_LWR:
	case R4300i_LDL:
	case R4300i_LDR:
	case R4300i_LBU:
	case R4300i_LHU:
	case R4300i_LD:
	case R4300i_LWC1:
	case R4300i_LDC1:
		if (Command.rt == 0)
		{
			return false;
		}
		if (Command.rt == Reg1 || Command.rt == Reg2)
		{
			return true;
		}
		break;
	case R4300i_CACHE: break;
	case R4300i_SB: break;
	case R4300i_SH: break;
	case R4300i_SW: break;
	case R4300i_SWR: break;
	case R4300i_SWL: break;
	case R4300i_SWC1: break;
	case R4300i_SDC1: break;
	case R4300i_SD: break;
	default:
		if (g_Settings->LoadBool(Debugger_Enabled)) 
		{
			g_Notify->DisplayError(L"Does %s effect Delay slot at %X?",R4300iOpcodeName(Command.Hex,PC+4), PC);
		}
		return true;
	}
	return false;
}

void CInterpreterCPU::BuildCPU()
{ 
	R4300iOp::m_TestTimer       = false;
	R4300iOp::m_NextInstruction = NORMAL;
	R4300iOp::m_JumpToLocation  = 0;
	
	if (g_Settings->LoadBool(Game_32Bit))
	{
		m_R4300i_Opcode = R4300iOp32::BuildInterpreter();
	}
	else
	{
		m_R4300i_Opcode = R4300iOp::BuildInterpreter();
	}
}

void CInterpreterCPU::InPermLoop()
{
	// *** Changed ***/
	//if (CPU_Type == CPU_SyncCores)
	//{
	//	SyncRegisters.CP0[9] +=5;
	//}

	/* Interrupts enabled */
	if (( g_Reg->STATUS_REGISTER & STATUS_IE  ) == 0 ||
	    ( g_Reg->STATUS_REGISTER & STATUS_EXL ) != 0 ||
		( g_Reg->STATUS_REGISTER & STATUS_ERL ) != 0 ||
		( g_Reg->STATUS_REGISTER & 0xFF00) == 0) 
	{
		if (g_Plugins->Gfx()->UpdateScreen != NULL)
		{
			g_Plugins->Gfx()->UpdateScreen();
		}
		//CurrentFrame = 0;
		//CurrentPercent = 0;
		//DisplayFPS();
		g_Notify->DisplayError(GS(MSG_PERM_LOOP));
		g_System->CloseCpu();
	}
	else
	{
		if (*g_NextTimer > 0)
		{
			*g_NextTimer = 0 - g_System->CountPerOp();
			g_SystemTimer->UpdateTimers();
		}
	}
}

void CInterpreterCPU::ExecuteCPU()
{ 	
	bool   & Done            = g_System->m_EndEmulation;
	DWORD  & PROGRAM_COUNTER = *_PROGRAM_COUNTER;
	OPCODE & Opcode          = R4300iOp::m_Opcode;
	DWORD  & JumpToLocation  = R4300iOp::m_JumpToLocation;
	bool   & TestTimer       = R4300iOp::m_TestTimer;
	const BOOL & bDoSomething= g_SystemEvents->DoSomething();
	DWORD CountPerOp         = g_System->CountPerOp();
	int & NextTimer = *g_NextTimer;
	
	__try 
	{
		while (!Done)
		{
			if (g_MMU->LW_VAddr(PROGRAM_COUNTER, Opcode.Hex)) 
			{
				/*if (PROGRAM_COUNTER > 0x80000300 && PROGRAM_COUNTER< 0x80380000)
				{
					WriteTraceF((TraceType)(TraceError | TraceNoHeader),"%X: %s",*_PROGRAM_COUNTER,R4300iOpcodeName(Opcode.Hex,*_PROGRAM_COUNTER));
					//WriteTraceF((TraceType)(TraceError | TraceNoHeader),"%X: %s t9: %08X v1: %08X",*_PROGRAM_COUNTER,R4300iOpcodeName(Opcode.Hex,*_PROGRAM_COUNTER),_GPR[0x19].UW[0],_GPR[0x03].UW[0]);
					//WriteTraceF((TraceType)(TraceError | TraceNoHeader),"%X: %d %d",*_PROGRAM_COUNTER,*g_NextTimer,g_SystemTimer->CurrentType());
				}*/
				m_R4300i_Opcode[ Opcode.op ]();
				NextTimer -= CountPerOp;
				
				switch (R4300iOp::m_NextInstruction)
				{
				case NORMAL: 
					PROGRAM_COUNTER += 4; 
					break;
				case DELAY_SLOT:
					R4300iOp::m_NextInstruction = JUMP;
					PROGRAM_COUNTER += 4; 
					break;
				case PERMLOOP_DO_DELAY:
					R4300iOp::m_NextInstruction = PERMLOOP_DELAY_DONE;
					PROGRAM_COUNTER += 4; 
					break;
				case JUMP:
					{
						BOOL CheckTimer = (JumpToLocation < PROGRAM_COUNTER || TestTimer); 
						PROGRAM_COUNTER  = JumpToLocation;
						R4300iOp::m_NextInstruction = NORMAL;
						if (CheckTimer)
						{
							TestTimer = false;
							if (NextTimer < 0) 
							{ 
								g_SystemTimer->TimerDone();
							}
							if (bDoSomething)
							{
								g_SystemEvents->ExecuteEvents();
							}
						}
					}
					break;
				case PERMLOOP_DELAY_DONE:
					PROGRAM_COUNTER  = JumpToLocation;
					R4300iOp::m_NextInstruction = NORMAL;
					CInterpreterCPU::InPermLoop();
					g_SystemTimer->TimerDone();
					if (bDoSomething)
					{
						g_SystemEvents->ExecuteEvents();
					}
					break;
				default:
					g_Notify->BreakPoint(__FILEW__,__LINE__);
				}
			}
			else
			{ 
				g_Reg->DoTLBReadMiss(R4300iOp::m_NextInstruction == JUMP,PROGRAM_COUNTER);
				R4300iOp::m_NextInstruction = NORMAL;
			}
		}
	} __except( g_MMU->MemoryFilter( GetExceptionCode(), GetExceptionInformation()) )
	{
		g_Notify->DisplayError(GS(MSG_UNKNOWN_MEM_ACTION));
		ExitThread(0);
	}
}


void CInterpreterCPU::ExecuteOps(int Cycles)
{
	bool   & Done            = g_System->m_EndEmulation;
	DWORD  & PROGRAM_COUNTER = *_PROGRAM_COUNTER;
	OPCODE & Opcode          = R4300iOp::m_Opcode;
	DWORD  & JumpToLocation  = R4300iOp::m_JumpToLocation;
	bool   & TestTimer       = R4300iOp::m_TestTimer;
	const BOOL & DoSomething = g_SystemEvents->DoSomething();
	DWORD CountPerOp         = g_System->CountPerOp();
	
	__try 
	{
		while (!Done)
		{
			if (Cycles <= 0) 
			{
				g_SystemTimer->UpdateTimers();
				return;
			}
			
			if (g_MMU->LW_VAddr(PROGRAM_COUNTER, Opcode.Hex)) 
			{
				/*if (PROGRAM_COUNTER > 0x80000300 && PROGRAM_COUNTER< 0x80380000)
				{
					WriteTraceF((TraceType)(TraceError | TraceNoHeader),"%X: %s",*_PROGRAM_COUNTER,R4300iOpcodeName(Opcode.Hex,*_PROGRAM_COUNTER));
					//WriteTraceF((TraceType)(TraceError | TraceNoHeader),"%X: %s t9: %08X v1: %08X",*_PROGRAM_COUNTER,R4300iOpcodeName(Opcode.Hex,*_PROGRAM_COUNTER),_GPR[0x19].UW[0],_GPR[0x03].UW[0]);
					//WriteTraceF((TraceType)(TraceError | TraceNoHeader),"%X: %d %d",*_PROGRAM_COUNTER,*g_NextTimer,g_SystemTimer->CurrentType());
				}*/
				/*if (PROGRAM_COUNTER > 0x80323000 && PROGRAM_COUNTER< 0x80380000)
				{
					WriteTraceF((TraceType)(TraceError | TraceNoHeader),"%X: %s",*_PROGRAM_COUNTER,R4300iOpcodeName(Opcode.Hex,*_PROGRAM_COUNTER));
					//WriteTraceF((TraceType)(TraceError | TraceNoHeader),"%X: %s t9: %08X v1: %08X",*_PROGRAM_COUNTER,R4300iOpcodeName(Opcode.Hex,*_PROGRAM_COUNTER),_GPR[0x19].UW[0],_GPR[0x03].UW[0]);
					//WriteTraceF((TraceType)(TraceError | TraceNoHeader),"%X: %d %d",*_PROGRAM_COUNTER,*g_NextTimer,g_SystemTimer->CurrentType());
				}*/				
				m_R4300i_Opcode[ Opcode.op ]();
				_GPR[0].DW = 0; /* MIPS $zero hard-wired to 0 */

				Cycles -= CountPerOp;
				*g_NextTimer -= CountPerOp;
				
				/*static DWORD TestAddress = 0x80077B0C, TestValue = 0, CurrentValue = 0;
				if (g_MMU->LW_VAddr(TestAddress, TestValue))
				{
					if (TestValue != CurrentValue)
					{
						WriteTraceF(TraceError,"%X: %X changed (%s)",PROGRAM_COUNTER,TestAddress,R4300iOpcodeName(m_Opcode.Hex,PROGRAM_COUNTER) );
						CurrentValue = TestValue;
					}
				}*/
				
				switch (R4300iOp::m_NextInstruction)
				{
				case NORMAL: 
					PROGRAM_COUNTER += 4; 
					break;
				case DELAY_SLOT:
					R4300iOp::m_NextInstruction = JUMP;
					PROGRAM_COUNTER += 4; 
					break;
				case PERMLOOP_DO_DELAY:
					R4300iOp::m_NextInstruction = PERMLOOP_DELAY_DONE;
					PROGRAM_COUNTER += 4; 
					break;
				case JUMP:
					{
						BOOL CheckTimer = (JumpToLocation < PROGRAM_COUNTER || TestTimer); 
						PROGRAM_COUNTER  = JumpToLocation;
						R4300iOp::m_NextInstruction = NORMAL;
						if (CheckTimer)
						{
							TestTimer = false;
							if (*g_NextTimer < 0)
							{
								g_SystemTimer->TimerDone();
							}
							if (DoSomething)
							{
								g_SystemEvents->ExecuteEvents();
							}
						}
					}
					break;
				case PERMLOOP_DELAY_DONE:
					PROGRAM_COUNTER  = JumpToLocation;
					R4300iOp::m_NextInstruction = NORMAL;
					CInterpreterCPU::InPermLoop();
					g_SystemTimer->TimerDone();
					if (DoSomething)
					{
						g_SystemEvents->ExecuteEvents();
					}
					break;
				default:
					g_Notify->BreakPoint(__FILEW__,__LINE__);
				}
			}
			else
			{ 
				g_Reg->DoTLBReadMiss(R4300iOp::m_NextInstruction == JUMP,PROGRAM_COUNTER);
				R4300iOp::m_NextInstruction = NORMAL;
			}
		}
	} __except( g_MMU->MemoryFilter( GetExceptionCode(), GetExceptionInformation()) )
	{
		g_Notify->DisplayError(GS(MSG_UNKNOWN_MEM_ACTION));
		ExitThread(0);
	}
}