// Copyright (c) 2012- PPSSPP Project.

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 2.0 or later versions.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License 2.0 for more details.

// A copy of the GPL 2.0 should have been included with the program.
// If not, see http://www.gnu.org/licenses/

// Official git repository and contact information can be found at
// https://github.com/hrydgard/ppsspp and http://www.ppsspp.org/.

#pragma once

#include "Common/CommonTypes.h"
#include "Common/Thunk.h"
#include "Core/MIPS/x86/Asm.h"

#if defined(ARM)
#error DO NOT BUILD X86 JIT ON ARM
#endif

#include "Common/x64Emitter.h"
#include "Core/MIPS/JitCommon/JitBlockCache.h"
#include "Core/MIPS/JitCommon/JitState.h"
#include "Core/MIPS/x86/RegCache.h"
#include "Core/MIPS/x86/RegCacheFPU.h"

namespace MIPSComp
{

// This is called when Jit hits a breakpoint.  Returns 1 when hit.
u32 JitBreakpoint();

struct JitOptions
{
	JitOptions();

	bool enableBlocklink;
	bool immBranches;
	bool continueBranches;
	bool continueJumps;
	int continueMaxInstructions;
};

// TODO: Hmm, humongous.
struct RegCacheState {
	GPRRegCacheState gpr;
	FPURegCacheState fpr;
};

class Jit : public Gen::XCodeBlock
{
public:
	Jit(MIPSState *mips);
	virtual ~Jit();

	void DoState(PointerWrap &p);
	static void DoDummyState(PointerWrap &p);

	// Compiled ops should ignore delay slots
	// the compiler will take care of them by itself
	// OR NOT
	void Comp_Generic(MIPSOpcode op);

	void RunLoopUntil(u64 globalticks);

	void Compile(u32 em_address);	// Compiles a block at current MIPS PC
	const u8 *DoJit(u32 em_address, JitBlock *b);

	bool DescribeCodePtr(const u8 *ptr, std::string &name);

	void Comp_RunBlock(MIPSOpcode op);
	void Comp_ReplacementFunc(MIPSOpcode op);

	// Ops
	void Comp_ITypeMem(MIPSOpcode op);
	void Comp_Cache(MIPSOpcode op);

	void Comp_RelBranch(MIPSOpcode op);
	void Comp_RelBranchRI(MIPSOpcode op);
	void Comp_FPUBranch(MIPSOpcode op);
	void Comp_FPULS(MIPSOpcode op);
	void Comp_FPUComp(MIPSOpcode op);
	void Comp_Jump(MIPSOpcode op);
	void Comp_JumpReg(MIPSOpcode op);
	void Comp_Syscall(MIPSOpcode op);
	void Comp_Break(MIPSOpcode op);

	void Comp_IType(MIPSOpcode op);
	void Comp_RType2(MIPSOpcode op);
	void Comp_RType3(MIPSOpcode op);
	void Comp_ShiftType(MIPSOpcode op);
	void Comp_Allegrex(MIPSOpcode op);
	void Comp_Allegrex2(MIPSOpcode op);
	void Comp_VBranch(MIPSOpcode op);
	void Comp_MulDivType(MIPSOpcode op);
	void Comp_Special3(MIPSOpcode op);

	void Comp_FPU3op(MIPSOpcode op);
	void Comp_FPU2op(MIPSOpcode op);
	void Comp_mxc1(MIPSOpcode op);

	void Comp_SV(MIPSOpcode op);
	void Comp_SVQ(MIPSOpcode op);
	void Comp_VPFX(MIPSOpcode op);
	void Comp_VVectorInit(MIPSOpcode op);
	void Comp_VMatrixInit(MIPSOpcode op);
	void Comp_VDot(MIPSOpcode op);
	void Comp_VecDo3(MIPSOpcode op);
	void Comp_VV2Op(MIPSOpcode op);
	void Comp_Mftv(MIPSOpcode op);
	void Comp_Vmtvc(MIPSOpcode op);
	void Comp_Vmmov(MIPSOpcode op);
	void Comp_VScl(MIPSOpcode op);
	void Comp_Vmmul(MIPSOpcode op);
	void Comp_Vmscl(MIPSOpcode op);
	void Comp_Vtfm(MIPSOpcode op);
	void Comp_VHdp(MIPSOpcode op);
	void Comp_VCrs(MIPSOpcode op);
	void Comp_VDet(MIPSOpcode op);
	void Comp_Vi2x(MIPSOpcode op);
	void Comp_Vx2i(MIPSOpcode op);
	void Comp_Vf2i(MIPSOpcode op);
	void Comp_Vi2f(MIPSOpcode op);
	void Comp_Vh2f(MIPSOpcode op);
	void Comp_Vcst(MIPSOpcode op);
	void Comp_Vhoriz(MIPSOpcode op);
	void Comp_VRot(MIPSOpcode op);
	void Comp_VIdt(MIPSOpcode op);
	void Comp_Vcmp(MIPSOpcode op);
	void Comp_Vcmov(MIPSOpcode op);
	void Comp_Viim(MIPSOpcode op);
	void Comp_Vfim(MIPSOpcode op);
	void Comp_VCrossQuat(MIPSOpcode op);
	void Comp_Vsgn(MIPSOpcode op);
	void Comp_Vocp(MIPSOpcode op);

	void Comp_DoNothing(MIPSOpcode op);

	int Replace_fabsf();
	int Replace_dl_write_matrix();

	void ApplyPrefixST(u8 *vregs, u32 prefix, VectorSize sz);
	void ApplyPrefixD(const u8 *vregs, VectorSize sz);
	void GetVectorRegsPrefixS(u8 *regs, VectorSize sz, int vectorReg) {
		_assert_(js.prefixSFlag & JitState::PREFIX_KNOWN);
		GetVectorRegs(regs, sz, vectorReg);
		ApplyPrefixST(regs, js.prefixS, sz);
	}
	void GetVectorRegsPrefixT(u8 *regs, VectorSize sz, int vectorReg) {
		_assert_(js.prefixTFlag & JitState::PREFIX_KNOWN);
		GetVectorRegs(regs, sz, vectorReg);
		ApplyPrefixST(regs, js.prefixT, sz);
	}
	void GetVectorRegsPrefixD(u8 *regs, VectorSize sz, int vectorReg);
	void EatPrefix() { js.EatPrefix(); }

	JitBlockCache *GetBlockCache() { return &blocks; }
	AsmRoutineManager &Asm() { return asm_; }

	void ClearCache();
	void ClearCacheAt(u32 em_address, int length = 4);

private:
	void GetStateAndFlushAll(RegCacheState &state);
	void RestoreState(const RegCacheState state);
	void FlushAll();
	void FlushPrefixV();
	void WriteDowncount(int offset = 0);
	bool ReplaceJalTo(u32 dest);
	// See CompileDelaySlotFlags for flags.
	void CompileDelaySlot(int flags, RegCacheState *state = NULL);
	void CompileDelaySlot(int flags, RegCacheState &state) {
		CompileDelaySlot(flags, &state);
	}
	void EatInstruction(MIPSOpcode op);

	void WriteExit(u32 destination, int exit_num);
	void WriteExitDestInReg(X64Reg reg);
	void WriteExitDestInEAX() { WriteExitDestInReg(EAX); }

//	void WriteRfiExitDestInEAX();
	void WriteSyscallExit();
	bool CheckJitBreakpoint(u32 addr, int downcountOffset);

	// Utility compilation functions
	void BranchFPFlag(MIPSOpcode op, Gen::CCFlags cc, bool likely);
	void BranchVFPUFlag(MIPSOpcode op, Gen::CCFlags cc, bool likely);
	void BranchRSZeroComp(MIPSOpcode op, Gen::CCFlags cc, bool andLink, bool likely);
	void BranchRSRTComp(MIPSOpcode op, Gen::CCFlags cc, bool likely);
	void BranchLog(MIPSOpcode op);
	void BranchLogExit(MIPSOpcode op, u32 dest, bool useEAX);

	// Utilities to reduce duplicated code
	void CompImmLogic(MIPSOpcode op, void (XEmitter::*arith)(int, const OpArg &, const OpArg &));
	void CompTriArith(MIPSOpcode op, void (XEmitter::*arith)(int, const OpArg &, const OpArg &), u32 (*doImm)(const u32, const u32));
	void CompShiftImm(MIPSOpcode op, void (XEmitter::*shift)(int, OpArg, OpArg), u32 (*doImm)(const u32, const u32));
	void CompShiftVar(MIPSOpcode op, void (XEmitter::*shift)(int, OpArg, OpArg), u32 (*doImm)(const u32, const u32));
	void CompITypeMemRead(MIPSOpcode op, u32 bits, void (XEmitter::*mov)(int, int, X64Reg, OpArg), const void *safeFunc);
	template <typename T>
	void CompITypeMemRead(MIPSOpcode op, u32 bits, void (XEmitter::*mov)(int, int, X64Reg, OpArg), T (*safeFunc)(u32 addr)) {
		CompITypeMemRead(op, bits, mov, (const void *)safeFunc);
	}
	void CompITypeMemWrite(MIPSOpcode op, u32 bits, const void *safeFunc);
	template <typename T>
	void CompITypeMemWrite(MIPSOpcode op, u32 bits, void (*safeFunc)(T val, u32 addr)) {
		CompITypeMemWrite(op, bits, (const void *)safeFunc);
	}
	void CompITypeMemUnpairedLR(MIPSOpcode op, bool isStore);
	void CompITypeMemUnpairedLRInner(MIPSOpcode op, X64Reg shiftReg);
	void CompBranchExits(CCFlags cc, u32 targetAddr, u32 notTakenAddr, bool delaySlotIsNice, bool likely, bool andLink);

	void CompFPTriArith(MIPSOpcode op, void (XEmitter::*arith)(X64Reg reg, OpArg), bool orderMatters);
	void CompFPComp(int lhs, int rhs, u8 compare, bool allowNaN = false);

	void CallProtectedFunction(const void *func, const OpArg &arg1);
	void CallProtectedFunction(const void *func, const OpArg &arg1, const OpArg &arg2);
	void CallProtectedFunction(const void *func, const u32 arg1, const u32 arg2, const u32 arg3);
	void CallProtectedFunction(const void *func, const OpArg &arg1, const u32 arg2, const u32 arg3);

	template <typename Tr, typename T1>
	void CallProtectedFunction(Tr (*func)(T1), const OpArg &arg1) {
		CallProtectedFunction((const void *)func, arg1);
	}

	template <typename Tr, typename T1, typename T2>
	void CallProtectedFunction(Tr (*func)(T1, T2), const OpArg &arg1, const OpArg &arg2) {
		CallProtectedFunction((const void *)func, arg1, arg2);
	}

	template <typename Tr, typename T1, typename T2, typename T3>
	void CallProtectedFunction(Tr (*func)(T1, T2, T3), const u32 arg1, const u32 arg2, const u32 arg3) {
		CallProtectedFunction((const void *)func, arg1, arg2, arg3);
	}

	template <typename Tr, typename T1, typename T2, typename T3>
	void CallProtectedFunction(Tr (*func)(T1, T2, T3), const OpArg &arg1, const u32 arg2, const u32 arg3) {
		CallProtectedFunction((const void *)func, arg1, arg2, arg3);
	}

	bool PredictTakeBranch(u32 targetAddr, bool likely);
	bool CanContinueBranch() {
		if (!jo.continueBranches || js.numInstructions >= jo.continueMaxInstructions) {
			return false;
		}
		// Need at least 2 exits left over.
		if (js.nextExit >= MAX_JIT_BLOCK_EXITS - 2) {
			return false;
		}
		return true;
	}

	JitBlockCache blocks;
	JitOptions jo;
	JitState js;

	GPRRegCache gpr;
	FPURegCache fpr;

	AsmRoutineManager asm_;
	ThunkManager thunks;

	MIPSState *mips_;

	class JitSafeMem {
	public:
		JitSafeMem(Jit *jit, MIPSGPReg raddr, s32 offset, u32 alignMask = 0xFFFFFFFF);

		// Emit code necessary for a memory write, returns true if MOV to dest is needed.
		bool PrepareWrite(OpArg &dest, int size);
		// Emit code proceeding a slow write call, returns true if slow write is needed.
		bool PrepareSlowWrite();
		// Emit a slow write from src.
		void DoSlowWrite(const void *safeFunc, const OpArg src, int suboffset = 0);
		template <typename T>
		void DoSlowWrite(void (*safeFunc)(T val, u32 addr), const OpArg src, int suboffset = 0) {
			DoSlowWrite((const void *)safeFunc, src, suboffset);
		}

		// Emit code necessary for a memory read, returns true if MOV from src is needed.
		bool PrepareRead(OpArg &src, int size);
		// Emit code for a slow read call, and returns true if result is in EAX.
		bool PrepareSlowRead(const void *safeFunc);
		template <typename T>
		bool PrepareSlowRead(T (*safeFunc)(u32 addr)) {
			return PrepareSlowRead((const void *)safeFunc);
		}
		
		// Cleans up final code for the memory access.
		void Finish();

		// Use this before anything else if you're gonna use the below.
		void SetFar();
		// WARNING: Only works for non-GPR.  Do not use for reads into GPR.
		OpArg NextFastAddress(int suboffset);
		// WARNING: Only works for non-GPR.  Do not use for reads into GPR.
		void NextSlowRead(const void *safeFunc, int suboffset);
		template <typename T>
		void NextSlowRead(T (*safeFunc)(u32 addr), int suboffset) {
			NextSlowRead((const void *)safeFunc, suboffset);
		}

	private:
		enum ReadType {
			MEM_READ,
			MEM_WRITE,
		};

		OpArg PrepareMemoryOpArg(ReadType type);
		void PrepareSlowAccess();
		void MemCheckImm(ReadType type);
		void MemCheckAsm(ReadType type);
		bool ImmValid();

		Jit *jit_;
		MIPSGPReg raddr_;
		s32 offset_;
		int size_;
		bool needsCheck_;
		bool needsSkip_;
		bool far_;
		bool fast_;
		u32 alignMask_;
		u32 iaddr_;
		X64Reg xaddr_;
		FixupBranch tooLow_, tooHigh_, skip_;
		std::vector<FixupBranch> skipChecks_;
		const u8 *safe_;
	};
	friend class JitSafeMem;
};

typedef void (Jit::*MIPSCompileFunc)(MIPSOpcode opcode);
typedef int (Jit::*MIPSReplaceFunc)();

}	// namespace MIPSComp