code

Documentation

Index

• func Make(op Opcode, operands ...int) []byte
• func ReadOperands(def *Definition, ins Instructions) ([]int, int)
• func ReadUint16(ins Instructions) uint16
• type Definition
  • func Lookup(op byte) (*Definition, error)
• type Instructions
  • func (ins Instructions) String() string
• type Opcode

Functions

func Make

func Make(op Opcode, operands ...int) []byte

Make returns the instruction given an opcode and it's operands

func ReadOperands

func ReadOperands(def *Definition, ins Instructions) ([]int, int)

func ReadUint16

func ReadUint16(ins Instructions) uint16

ReadUint16 reads the next 2 bytes from the given instructions slice and interprets them as a uint16

Types

type Definition

type Definition struct {
	Name          string
	OperandWidths []int
}

Definition provides a readable name for the Opcode and number of bytes each operand takes up

func Lookup

func Lookup(op byte) (*Definition, error)

Lookup returns the definition of operation

type Instructions

type Instructions []byte

func (Instructions) String

func (ins Instructions) String() string

Disassembler for Instructions

type Opcode

type Opcode byte

const (
	OpConstant Opcode = iota
	OpAdd
	OpPop
	OpSub
	OpMul
	OpDiv
	OpTrue
	OpFalse
	OpEqual
	OpNotEqual
	OpGreaterThan
	OpMinus
	OpBang
	OpJumpNotTruthy
	OpJump
	OpNull
	OpGetGlobal
	OpSetGlobal
	OpArray
	OpHash
	OpIndex
	OpCall
	OpReturnValue
	OpReturn
)

Byte size operation codes with incrementing values