There is an assembler now
This commit is contained in:
Sasha Koshka
parent
5b2e13dcf4
commit
565d733e0f
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@ -1 +1,2 @@
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/marcie/marcie
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/masm/masm
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@ -7,6 +7,7 @@ import "git.tebibyte.media/sashakoshka/marcie"
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func main () {
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if len(os.Args) != 2 {
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fmt.Println("specify file name")
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os.Exit(1)
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}
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file, err := os.Open(os.Args[1])
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Binary file not shown.
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@ -0,0 +1,25 @@
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counter, adr string
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one, dec 1
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string, chr h
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chr e
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chr l
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chr l
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chr o
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chr r
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chr l
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chr d
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hex a
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hex 0
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// if the current character is zero, halt
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loopStart, loadi counter
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skipcond 800
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halt
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// otherwise, output it, increment, and loop
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output
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load counter
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add one
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store counter
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jump loopStart
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@ -0,0 +1,305 @@
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package main
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import "os"
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import "fmt"
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import "bufio"
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import "errors"
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import "strings"
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import "strconv"
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import "git.tebibyte.media/sashakoshka/marcie"
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type Statement struct {
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label string
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opcode marcie.Opcode
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lineNumber int
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isOperation bool
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operand int16
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reference string
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wantAddress bool
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}
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const ORG = marcie.Opcode(0xFF)
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var mnemonics = map[string] marcie.Opcode {
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"jns": marcie.JNS,
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"load": marcie.LOAD,
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"store": marcie.STORE,
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"add": marcie.ADD,
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"subt": marcie.SUBT,
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"input": marcie.INPUT,
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"output": marcie.OUTPUT,
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"halt": marcie.HALT,
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"skipcond": marcie.SKIPCOND,
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"jump": marcie.JUMP,
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"clear": marcie.CLEAR,
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"addi": marcie.ADDI,
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"jumpi": marcie.JUMPI,
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"loadi": marcie.LOADI,
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"storei": marcie.STOREI,
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"org": ORG,
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}
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var literalParsers = map[string] func (input string) (output int16, err error) {
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"hex": parseHexLiteral,
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"dec": parseDecLiteral,
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"chr": parseCharLiteral,
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}
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func main () {
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if len(os.Args) != 3 {
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fmt.Println("specify input and output file names")
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os.Exit(1)
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}
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inputFile, err := os.Open(os.Args[1])
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if err != nil {
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fmt.Println(err)
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os.Exit(1)
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}
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inputScanner := bufio.NewScanner(inputFile)
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inputScanner.Split(bufio.ScanLines)
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origin := 0
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originSet := false
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operations := []Statement { }
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symbols := []Statement { }
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symbolTable := map[string] int { }
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// parse
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for lineNumber := 0; inputScanner.Scan(); lineNumber ++ {
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tokens := strings.Fields(inputScanner.Text())
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if len(tokens) == 0 { continue }
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statement, err := parseStatement(tokens)
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statement.lineNumber = lineNumber
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if statement.opcode == ORG {
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if originSet {
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err = errors.New("origin may only be set once")
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} else {
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origin = int(statement.operand)
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originSet = true
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}
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}
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if statement.opcode != ORG {
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if statement.isOperation {
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operations = append(operations, statement)
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} else {
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symbols = append(symbols, statement)
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}
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}
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if err != nil {
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fmt.Println (
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"file", os.Args[1],
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"line", lineNumber + 1,
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err)
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os.Exit(1)
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}
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}
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// get symbol addresses
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placer := origin
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statements := append(operations, symbols...)
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for _, statement := range statements {
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if statement.label != "" {
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_, alreadyDefined := symbolTable[statement.label]
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if alreadyDefined {
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err = errors.New (
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"symbol " + statement.label +
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"defined more than once")
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} else {
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symbolTable[statement.label] = placer
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}
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}
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placer ++
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}
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if inputScanner.Err() != nil {
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fmt.Println(inputScanner.Err())
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os.Exit(1)
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}
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outputFile, err := os.Create(os.Args[2])
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if err != nil {
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fmt.Println(err)
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os.Exit(1)
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}
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// for _, statement := range statements {
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// fmt.Println(statement)
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// }
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//
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// for symbol, address := range symbolTable {
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// fmt.Println(symbol, address)
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// }
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// write origin
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buffer := make([]byte, 2)
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buffer[0] = byte((uint16(origin) >> 8) & 0xFF)
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buffer[1] = byte(uint16(origin) & 0xFF)
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_, err = outputFile.Write(buffer)
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if err != nil {
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fmt.Println(err)
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os.Exit(1)
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}
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// zero pad
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// TODO: possibly make the simulator insert the program into the memory
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// at the location specified by the origin instead of doing this
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for index := 0; index < origin; index ++ {
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_, err = outputFile.Write([]byte { 0, 0 })
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if err != nil {
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fmt.Println(err)
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os.Exit(1)
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}
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}
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// resolve symbols and write to file
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for index := 0; index < len(statements); index ++ {
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statement := &statements[index]
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if statement.reference != "" {
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address, exists := symbolTable[statement.reference]
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if !exists {
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fmt.Println (
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"file", os.Args[1],
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"line", statement.lineNumber + 1,
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"symbol", statement.reference,
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"not found")
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os.Exit(1)
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}
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statement.operand = int16(address)
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}
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buffer := make([]byte, 2)
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if statement.isOperation {
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opcode := uint16(statement.opcode)
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operand := uint16(statement.operand)
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buffer[0] = byte((opcode << 4) & 0xF0)
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buffer[0] |= byte((operand >> 8) & 0x0F)
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buffer[1] = byte(operand & 0xFF)
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} else {
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operand := uint16(statement.operand)
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buffer[0] = byte((operand >> 8) & 0xFF)
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buffer[1] = byte(operand & 0xFF)
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}
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_, err = outputFile.Write(buffer)
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if err != nil {
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fmt.Println(err)
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os.Exit(1)
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}
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}
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}
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func parseStatement (tokens []string) (statement Statement, err error) {
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if tokens[0][0] == '/' {
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// skip line if it is a comment
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return
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}
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// get label if it exists
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possibleLabel := tokens[0]
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if possibleLabel[len(possibleLabel) - 1] == ',' {
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statement.label = possibleLabel[:len(possibleLabel) - 1]
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tokens = tokens[1:]
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}
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// get mnemonic if it exists
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if len(tokens) < 1 {
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err = errors.New("expected operand")
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return
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}
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mnemonic := strings.ToLower(tokens[0])
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opcode, exists := mnemonics[mnemonic]
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if exists {
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statement.opcode = opcode
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statement.isOperation = true
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tokens = tokens[1:]
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} else if len(tokens) < 1 {
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err = errors.New("unknown opcode " + mnemonic)
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return
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}
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// if there is no operand, go on to the next line
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if len(tokens) < 1 { return }
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// get type signifier if it exists
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signifier := strings.ToLower(tokens[0])
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parseFunction, exists := literalParsers[signifier]
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if exists {
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tokens = tokens[1:]
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} else if statement.isOperation {
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if tokens[0][0] >= '0' && tokens[0][0] <= '9' {
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// this must be a hex literal
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parseFunction = parseHexLiteral
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} else {
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// this must be a variable name
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statement.reference = tokens[0]
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tokens = tokens[1:]
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return
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}
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} else if signifier == "adr" {
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// if we are parsing a variable then we can set it to the
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// address of another variable
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tokens = tokens[1:]
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if len(tokens) < 1 {
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err = errors.New("expected symbol name")
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return
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}
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statement.reference = tokens[0]
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tokens = tokens[1:]
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return
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} else {
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// statement needs to have a type signifier or be an
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// operation, if it is neither we assume a mistyped
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// opcode
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err = errors.New("unknown opcode " + mnemonic)
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return
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}
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if len(tokens) < 1 {
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err = errors.New("expected literal")
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return
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}
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statement.operand, err = parseFunction(tokens[0])
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return
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}
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func parseHexLiteral (input string) (output int16, err error) {
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var intOutput int64
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intOutput, err = strconv.ParseInt(input, 16, 16)
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output = int16(intOutput)
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return
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}
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func parseDecLiteral (input string) (output int16, err error) {
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var intOutput int64
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intOutput, err = strconv.ParseInt(input, 10, 16)
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output = int16(intOutput)
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return
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}
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func parseCharLiteral (input string) (output int16, err error) {
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runes := []rune(input)
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if len(runes) != 1 {
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err = errors.New("excess data in char literal")
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return
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}
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output = int16(runes[0])
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return
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}
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