Golang operation.Operation類代碼示例

func (this *ReorderBuffer) LoadData(op *operation.Operation, address uint32) uint32 {
	robEntry, ok := this.getEntryByDestination(op.Id(), MemoryType, address)
	if ok {
		return uint32(robEntry.Value)
	}
	return this.Processor().DataMemory().LoadUint32(address)
}

func (this *ReorderBuffer) SetProgramCounter(op *operation.Operation, value uint32) {

	this.Buffer()[op.Id()] = RobEntry{
		Operation:   op,
		Type:        ProgramCounterType,
		Destination: AbsoluteType,
		Value:       int32(value),
		Cycle:       this.Processor().Cycles(),
	}
}

func (this *ReorderBuffer) IncrementProgramCounter(op *operation.Operation, value int32) {

	this.Buffer()[op.Id()] = RobEntry{
		Operation:   op,
		Type:        ProgramCounterType,
		Destination: OffsetType,
		Value:       value,
		Cycle:       this.Processor().Cycles(),
	}
}

func (this *ReorderBuffer) StoreData(op *operation.Operation, address, value uint32) {

	this.Buffer()[op.Id()] = RobEntry{
		Operation:   op,
		Type:        MemoryType,
		Destination: address,
		Value:       int32(value),
		Cycle:       this.Processor().Cycles(),
	}
}

func (this *Fpu) Process(operation *operation.Operation) (*operation.Operation, error) {
	instruction := operation.Instruction()
	outputAddress, err := this.compute(operation, instruction.Info, instruction.Data)
	if err != nil {
		return operation, err
	}
	logger.Collect(" => [FPU][%03d]: [R%d(%#02X) = %#08X]", operation.Id(), outputAddress, outputAddress*consts.BYTES_PER_WORD, this.Result())

	// Persist output data
	this.Bus().StoreRegister(operation, outputAddress, this.Result())
	return operation, nil
}

func (this *Decoder) decodeInstruction(op *operation.Operation) (*instruction.Instruction, error) {
	startCycles := this.Processor().Cycles()

	// Do decode once a data instruction is received
	instruction, err := this.Processor().InstructionsSet().GetInstructionFromBytes(op.Word())
	if err != nil {
		return nil, errors.New(fmt.Sprintf("Failed decoding instruction %#04X. %s]", op.Word(), err.Error()))
	}
	logger.Collect(" => [DE%d][%03d]: %#04X = %s, %s", this.Index(), op.Id(), op.Word(), instruction.Info.ToString(), instruction.Data.ToString())

	// Wait cycles of a decode stage
	this.Processor().Wait(consts.DECODE_CYCLES)

	// Log event
	if this.IsActive() {
		this.Processor().LogEvent(consts.DECODE_EVENT, this.Index(), op.Id(), startCycles)
	}
	return instruction, nil
}

func (this *Alu) Process(operation *operation.Operation) (*operation.Operation, error) {
	instruction := operation.Instruction()

	// Clean Status
	this.CleanStatus()

	outputAddress, err := this.compute(operation, instruction.Info, instruction.Data)
	if err != nil {
		return operation, err
	}
	logger.Collect(" => [ALU][%03d]: [R%d(%#02X) = %#08X]", operation.Id(), outputAddress, outputAddress*consts.BYTES_PER_WORD, this.Result())

	// Set status flags
	this.SetStatusFlag(this.Result()%2 == 0, consts.FLAG_PARITY)
	this.SetStatusFlag(this.Result() == 0, consts.FLAG_ZERO)
	this.SetStatusFlag(getSign(this.Result()), consts.FLAG_SIGN)

	// Persist output data
	this.Bus().StoreRegister(operation, outputAddress, this.Result())
	return operation, nil
}

func (this *ReorderBuffer) LoadRegister(op *operation.Operation, index uint32) uint32 {
	lookupRegister := index
	// If renaming register enabled
	if len(this.RegisterAliasTable().Entries()) > 0 {
		ratEntry, ok := this.RegisterAliasTable().GetPhysicalRegister(op.Id()-1, index)
		if ok {
			// Proceed to search register in ROB with renamed dest from RAT
			lookupRegister = ratEntry
		} else {
			// Alias does not exist, value was already commited (search on memory)
			return this.Processor().RegistersMemory().LoadUint32(index * consts.BYTES_PER_WORD)
		}
	}

	// Search register on ROB
	robEntry, ok := this.getEntryByDestination(op.Id(), RegisterType, lookupRegister)
	if ok {
		return uint32(robEntry.Value)
	}
	return this.Processor().RegistersMemory().LoadUint32(index * consts.BYTES_PER_WORD)
}

func (this *Branch) Process(operation *operation.Operation) (*operation.Operation, error) {
	instruction := operation.Instruction()
	info := instruction.Info
	operands := instruction.Data

	switch info.Type {
	case data.TypeI:
		registerD := operands.(*data.DataI).RegisterD.ToUint32()
		op1 := this.Bus().LoadRegister(operation, registerD)
		registerS := operands.(*data.DataI).RegisterS.ToUint32()
		op2 := this.Bus().LoadRegister(operation, registerS)
		logger.Collect(" => [BR][%03d]: [R%d(%#02X) = %#08X ? R%d(%#02X) = %#08X]",
			operation.Id(), registerD, registerD*consts.BYTES_PER_WORD, op1, registerS, registerS*consts.BYTES_PER_WORD, op2)

		taken, err := processOperation(op1, op2, info.Opcode)
		if err != nil {
			return operation, nil
		}
		operation.SetBranchResult(taken)

		if taken {
			offsetAddress := ComputeOffsetTypeI(operands)
			this.Bus().IncrementProgramCounter(operation, offsetAddress)
			logger.Collect(" => [BR][%03d]: [PC(offset) = 0x%06X", operation.Id(), offsetAddress)
		} else {
			// Notify ROB
			this.Bus().IncrementProgramCounter(operation, 0)
		}
	case data.TypeJ:
		address := ComputeAddressTypeJ(operands)
		this.Bus().SetProgramCounter(operation, uint32(address-consts.BYTES_PER_WORD))
		logger.Collect(" => [BR][%03d]: [Address = %06X]", operation.Id(), address)
	default:
		return operation, errors.New(fmt.Sprintf("Invalid data type to process by Branch unit. Type: %d", info.Type))
	}
	return operation, nil
}

func (this *ReorderBuffer) waitStallOperationIfFull(op *operation.Operation) {
	for uint32(len(this.Buffer())) >= this.RobEntries() {
		lastCompletedOpId := this.Processor().LastOperationIdCompleted()
		if op.Id() == lastCompletedOpId+1 {
			logger.Collect(" => [RB%d][%03d]: Writing latest instruction.", this.Index(), op.Id())
			return
		}
		logger.Collect(" => [RB%d][%03d]: ROB is full, wait for free entries. Current: %d, Max: %d, LastOpId: %d...",
			this.Index(), op.Id(), len(this.Buffer()), this.RobEntries(), lastCompletedOpId)
		this.Processor().Wait(1)
	}
}

func (this *Executor) executeOperation(unit IExecutor, event string, op *operation.Operation) (*operation.Operation, error) {
	startCycles := this.Processor().Cycles()

	// Do decode once a data instruction is received
	var err error
	op, err = unit.Process(op)
	if err != nil {
		return op, errors.New(fmt.Sprintf("Failed executing instruction. %s]", err.Error()))
	}
	// Wait cycles of a execution stage
	logger.Collect(" => [%s%d][%03d]: Executing %s, %s", event, this.Index(), op.Id(), op.Instruction().Info.ToString(), op.Instruction().Data.ToString())
	for i := uint8(0); i < op.Instruction().Info.Cycles; i++ {
		this.Processor().Wait(1)
	}
	// Log completion
	if this.IsActive() {
		this.Processor().LogEvent(event, this.Index(), op.Id(), startCycles)
	}
	return op, nil
}

func (this *ReorderBuffer) StoreRegister(op *operation.Operation, index, value uint32) {

	dest := index
	// If renaming register enabled
	if op.RenamedDestRegister() != -1 {
		dest = uint32(op.RenamedDestRegister())
	}
	this.Buffer()[op.Id()] = RobEntry{
		Operation:   op,
		Type:        RegisterType,
		Destination: dest,
		Value:       int32(value),
		Cycle:       this.Processor().Cycles(),
	}
}

func (this *ReservationStation) dispatchOperation(entryIndex EntryIndex, op *operation.Operation) {

	// Lock a slot in max quantity of instructions dispatcher per cycle
	this.AddInstructionsFetchedStack()
	// Release reservation station entry
	this.Entries()[entryIndex].Busy = true

	go func() {
		// Release one entry and send operation to execution, when output channel (execution unit) is free
		logger.Collect(" => [RS%d][%03d]: Sending entry %d to %s queue...", this.Index(), op.Id(), entryIndex, op.Instruction().Info.Category)
		// Wait dispatch cycles
		startCycles := this.Processor().Cycles()
		this.Processor().Wait(consts.DISPATCH_CYCLES)
		// Log completion
		this.Processor().LogEvent(consts.DISPATCH_EVENT, this.Index(), op.Id(), startCycles)
		// Send data to execution unit in a go routine, when execution unit is available
		go this.Output()[op.Instruction().Info.Category].Add(op)
	}()
}

func (this *LoadStore) Process(operation *operation.Operation) (*operation.Operation, error) {

	instruction := operation.Instruction()
	rdAddress := instruction.Data.(*data.DataI).RegisterD.ToUint32()
	rsAddress := instruction.Data.(*data.DataI).RegisterS.ToUint32()
	immediate := instruction.Data.(*data.DataI).Immediate.ToUint32()

	switch instruction.Info.Opcode {
	case set.OP_LW:
		rsValue := this.Bus().LoadRegister(operation, rsAddress)
		value := this.Bus().LoadData(operation, rsValue+immediate)
		this.Bus().StoreRegister(operation, rdAddress, value)
		logger.Collect(" => [LS][%03d]: [R%d(%#02X) = MEM(%#02X) = %#08X]", operation.Id(), rdAddress, rdAddress*consts.BYTES_PER_WORD, rsValue+immediate, value)
	case set.OP_SW:
		rdValue := this.Bus().LoadRegister(operation, rdAddress)
		rsValue := this.Bus().LoadRegister(operation, rsAddress)
		this.Bus().StoreData(operation, rdValue+immediate, rsValue)
		logger.Collect(" => [LS][%03d]: [MEM(%#02X) = %#08X]", operation.Id(), rdValue+immediate, rsValue)
	case set.OP_LLI:
		this.Bus().StoreRegister(operation, rdAddress, immediate)
		logger.Collect(" => [LS][%03d]: [R%d(%#02X) = %#08X]", operation.Id(), rdAddress, rdAddress*consts.BYTES_PER_WORD, immediate)
	case set.OP_SLI:
		rdValue := this.Bus().LoadRegister(operation, rdAddress)
		this.Bus().StoreData(operation, rdValue, immediate)
		logger.Collect(" => [LS][%03d]: [MEM(%#02X) = %#08X]", operation.Id(), rdValue, immediate)
	case set.OP_LUI:
		this.Bus().StoreRegister(operation, rdAddress, immediate<<16)
		logger.Collect(" => [LS][%03d]: [R%d(%#02X) = %#08X]", operation.Id(), rdAddress, rdAddress*consts.BYTES_PER_WORD, immediate<<16)
	case set.OP_SUI:
		rdValue := this.Bus().LoadRegister(operation, rdAddress)
		this.Bus().StoreData(operation, rdValue, immediate<<16)
		logger.Collect(" => [LS][%03d]: [MEM(%#02X) = %#08X]", operation.Id(), rdValue, immediate<<16)
	default:
		return operation, errors.New(fmt.Sprintf("Invalid operation to process by Data unit. Opcode: %d", instruction.Info.Opcode))
	}
	return operation, nil
}

func (this *Fetcher) fetchInstructions(op *operation.Operation, bytes []byte, input channel.Channel) ([]*operation.Operation, error) {

	initialAddress := op.Address()
	totalInstructions := len(bytes) / consts.BYTES_PER_WORD
	ops := []*operation.Operation{}

	// Analyze each instruction loaded
	for i := 0; i < totalInstructions; i += 1 {

		data := bytes[i*consts.BYTES_PER_WORD : (i+1)*consts.BYTES_PER_WORD]

		// Check program reach end
		if this.Processor().ReachedEnd(data) {
			this.processor.Finish()
			return ops, nil
		}

		// Do fetch once a new address is received
		msg := fmt.Sprintf(" => [FE%d][%03d]: INS[%#04X] = %#04X", this.Index(), this.Processor().InstructionsFetchedCounter(), op.Address(), data)
		value, ok := this.Processor().InstructionsMap()[op.Address()]
		if ok {
			msg = fmt.Sprintf("%s // %s", msg, strings.TrimSpace(strings.Split(value, "=>")[1]))
		}
		logger.Collect(msg)

		// Log event
		this.Processor().LogInstructionFetched(op.Address())

		// Update data into operation and add to array for post-events
		op.SetWord([]byte{data[0], data[1], data[2], data[3]})

		// Add operation to be sent to decode channel
		ops = append(ops, op)

		// Do pre-decode
		needsWait, instruction := this.BranchPredictor().PreDecodeInstruction(op.Address())

		// If is not pipelined than wait instruction to finish
		if !this.Processor().Config().Pipelined() {
			go func() {
				address, _, err := this.BranchPredictor().GetNextAddress(op.Address(), instruction, true)
				newOp := operation.New(this.Processor().InstructionsFetchedCounter(), address)
				if err == nil {
					input.Add(newOp)
				}
			}()
			return ops, nil
		}

		// Add next instruction for fetching (as many instructions as it supports per cycle)
		if needsWait {
			logger.Collect(" => [FE%d][%03d]: Wait detected, no fetching more instructions this cycle", this.Index(), this.Processor().InstructionsFetchedCounter()-1)
			// Add next instruction in a go routine as it need to be stalled
			go func() {
				address, _, err := this.BranchPredictor().GetNextAddress(op.Address(), instruction, false)
				newOp := operation.New(this.Processor().InstructionsFetchedCounter(), address)
				if err == nil {
					input.Add(newOp)
				}
			}()
			return ops, nil
		} else {
			address, predicted, err := this.BranchPredictor().GetNextAddress(op.Address(), instruction, false)
			// Set current operation added to be decoded the predicted address
			if predicted {
				ops[len(ops)-1].SetNextPredictedAddress(address)
			}

			// Create new operation object
			op = operation.New(this.Processor().InstructionsFetchedCounter(), address)
			// If is the last instruction from the package or the predicted address is outside of the address package
			if err == nil && (i >= totalInstructions-1 || initialAddress+(uint32(i+1)*consts.BYTES_PER_WORD) != op.Address()) {
				input.Add(op)
				return ops, nil
			}
		}
	}
	return ops, nil
}