Revert "cmd/evm: fix some issues with the evm run command (#28109)"

This reverts commit 0264a9ad74.

cmd/evm/blockrunner.go

@@ -25,6 +25,7 @@ import (
 	"github.com/ethereum/go-ethereum/core/rawdb"
 	"github.com/ethereum/go-ethereum/core/vm"
 	"github.com/ethereum/go-ethereum/eth/tracers/logger"
+	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/tests"
 	"github.com/urfave/cli/v2"
 )
@@ -40,7 +41,10 @@ func blockTestCmd(ctx *cli.Context) error {
 	if len(ctx.Args().First()) == 0 {
 		return errors.New("path-to-test argument required")
 	}
-
+	// Configure the go-ethereum logger
+	glogger := log.NewGlogHandler(log.StreamHandler(os.Stderr, log.TerminalFormat(false)))
+	glogger.Verbosity(log.Lvl(ctx.Int(VerbosityFlag.Name)))
+	log.Root().SetHandler(glogger)
 	var tracer vm.EVMLogger
 	// Configure the EVM logger
 	if ctx.Bool(MachineFlag.Name) {

cmd/evm/main.go

@@ -23,7 +23,6 @@ import (
 	"os"
 
 	"github.com/ethereum/go-ethereum/cmd/evm/internal/t8ntool"
-	"github.com/ethereum/go-ethereum/internal/debug"
 	"github.com/ethereum/go-ethereum/internal/flags"
 	"github.com/urfave/cli/v2"
 )
@@ -32,107 +31,99 @@ var (
 	DebugFlag = &cli.BoolFlag{
 		Name:  "debug",
 		Usage: "output full trace logs",
-		Category: flags.VMCategory,
+	}
+	MemProfileFlag = &cli.StringFlag{
+		Name:  "memprofile",
+		Usage: "creates a memory profile at the given path",
+	}
+	CPUProfileFlag = &cli.StringFlag{
+		Name:  "cpuprofile",
+		Usage: "creates a CPU profile at the given path",
 	}
 	StatDumpFlag = &cli.BoolFlag{
 		Name:  "statdump",
 		Usage: "displays stack and heap memory information",
-		Category: flags.VMCategory,
 	}
 	CodeFlag = &cli.StringFlag{
 		Name:  "code",
 		Usage: "EVM code",
-		Category: flags.VMCategory,
 	}
 	CodeFileFlag = &cli.StringFlag{
 		Name:  "codefile",
 		Usage: "File containing EVM code. If '-' is specified, code is read from stdin ",
-		Category: flags.VMCategory,
 	}
 	GasFlag = &cli.Uint64Flag{
 		Name:  "gas",
 		Usage: "gas limit for the evm",
 		Value: 10000000000,
-		Category: flags.VMCategory,
 	}
 	PriceFlag = &flags.BigFlag{
 		Name:  "price",
 		Usage: "price set for the evm",
 		Value: new(big.Int),
-		Category: flags.VMCategory,
 	}
 	ValueFlag = &flags.BigFlag{
 		Name:  "value",
 		Usage: "value set for the evm",
 		Value: new(big.Int),
-		Category: flags.VMCategory,
 	}
 	DumpFlag = &cli.BoolFlag{
 		Name:  "dump",
 		Usage: "dumps the state after the run",
-		Category: flags.VMCategory,
 	}
 	InputFlag = &cli.StringFlag{
 		Name:  "input",
 		Usage: "input for the EVM",
-		Category: flags.VMCategory,
 	}
 	InputFileFlag = &cli.StringFlag{
 		Name:  "inputfile",
 		Usage: "file containing input for the EVM",
-		Category: flags.VMCategory,
+	}
+	VerbosityFlag = &cli.IntFlag{
+		Name:  "verbosity",
+		Usage: "sets the verbosity level",
 	}
 	BenchFlag = &cli.BoolFlag{
 		Name:  "bench",
 		Usage: "benchmark the execution",
-		Category: flags.VMCategory,
 	}
 	CreateFlag = &cli.BoolFlag{
 		Name:  "create",
 		Usage: "indicates the action should be create rather than call",
-		Category: flags.VMCategory,
 	}
 	GenesisFlag = &cli.StringFlag{
 		Name:  "prestate",
 		Usage: "JSON file with prestate (genesis) config",
-		Category: flags.VMCategory,
 	}
 	MachineFlag = &cli.BoolFlag{
 		Name:  "json",
 		Usage: "output trace logs in machine readable format (json)",
-		Category: flags.VMCategory,
 	}
 	SenderFlag = &cli.StringFlag{
 		Name:  "sender",
 		Usage: "The transaction origin",
-		Category: flags.VMCategory,
 	}
 	ReceiverFlag = &cli.StringFlag{
 		Name:  "receiver",
 		Usage: "The transaction receiver (execution context)",
-		Category: flags.VMCategory,
 	}
 	DisableMemoryFlag = &cli.BoolFlag{
 		Name:  "nomemory",
 		Value: true,
 		Usage: "disable memory output",
-		Category: flags.VMCategory,
 	}
 	DisableStackFlag = &cli.BoolFlag{
 		Name:  "nostack",
 		Usage: "disable stack output",
-		Category: flags.VMCategory,
 	}
 	DisableStorageFlag = &cli.BoolFlag{
 		Name:  "nostorage",
 		Usage: "disable storage output",
-		Category: flags.VMCategory,
 	}
 	DisableReturnDataFlag = &cli.BoolFlag{
 		Name:  "noreturndata",
 		Value: true,
 		Usage: "enable return data output",
-		Category: flags.VMCategory,
 	}
 )
 
@@ -192,38 +183,34 @@ var blockBuilderCommand = &cli.Command{
 	},
 }
 
-// vmFlags contains flags related to running the EVM.
-var vmFlags = []cli.Flag{
+var app = flags.NewApp("the evm command line interface")
+
+func init() {
+	app.Flags = []cli.Flag{
+		BenchFlag,
+		CreateFlag,
+		DebugFlag,
+		VerbosityFlag,
 		CodeFlag,
 		CodeFileFlag,
-	CreateFlag,
 		GasFlag,
 		PriceFlag,
 		ValueFlag,
+		DumpFlag,
 		InputFlag,
 		InputFileFlag,
+		MemProfileFlag,
+		CPUProfileFlag,
+		StatDumpFlag,
 		GenesisFlag,
+		MachineFlag,
 		SenderFlag,
 		ReceiverFlag,
-}
-
-// traceFlags contains flags that configure tracing output.
-var traceFlags = []cli.Flag{
-	BenchFlag,
-	DebugFlag,
-	DumpFlag,
-	MachineFlag,
-	StatDumpFlag,
 		DisableMemoryFlag,
 		DisableStackFlag,
 		DisableStorageFlag,
 		DisableReturnDataFlag,
 	}
-
-var app = flags.NewApp("the evm command line interface")
-
-func init() {
-	app.Flags = flags.Merge(vmFlags, traceFlags, debug.Flags)
 	app.Commands = []*cli.Command{
 		compileCommand,
 		disasmCommand,
@@ -234,14 +221,6 @@ func init() {
 		transactionCommand,
 		blockBuilderCommand,
 	}
-	app.Before = func(ctx *cli.Context) error {
-		flags.MigrateGlobalFlags(ctx)
-		return debug.Setup(ctx)
-	}
-	app.After = func(ctx *cli.Context) error {
-		debug.Exit()
-		return nil
-	}
 }
 
 func main() {

cmd/evm/runner.go

@@ -24,6 +24,7 @@ import (
 	"math/big"
 	"os"
 	goruntime "runtime"
+	"runtime/pprof"
 	"testing"
 	"time"
 
@@ -33,10 +34,12 @@ import (
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/rawdb"
 	"github.com/ethereum/go-ethereum/core/state"
+	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/core/vm"
 	"github.com/ethereum/go-ethereum/core/vm/runtime"
 	"github.com/ethereum/go-ethereum/eth/tracers/logger"
 	"github.com/ethereum/go-ethereum/internal/flags"
+	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/params"
 	"github.com/ethereum/go-ethereum/trie"
 	"github.com/ethereum/go-ethereum/trie/triedb/hashdb"
@@ -49,7 +52,6 @@ var runCommand = &cli.Command{
 	Usage:       "run arbitrary evm binary",
 	ArgsUsage:   "<code>",
 	Description: `The run command runs arbitrary EVM code.`,
-	Flags:       flags.Merge(vmFlags, traceFlags),
 }
 
 // readGenesis will read the given JSON format genesis file and return
@@ -107,6 +109,9 @@ func timedExec(bench bool, execFunc func() ([]byte, uint64, error)) (output []by
 }
 
 func runCmd(ctx *cli.Context) error {
+	glogger := log.NewGlogHandler(log.StreamHandler(os.Stderr, log.TerminalFormat(false)))
+	glogger.Verbosity(log.Lvl(ctx.Int(VerbosityFlag.Name)))
+	log.Root().SetHandler(glogger)
 	logconfig := &logger.Config{
 		EnableMemory:     !ctx.Bool(DisableMemoryFlag.Name),
 		DisableStack:     ctx.Bool(DisableStackFlag.Name),
@@ -122,6 +127,7 @@ func runCmd(ctx *cli.Context) error {
 		chainConfig   *params.ChainConfig
 		sender        = common.BytesToAddress([]byte("sender"))
 		receiver      = common.BytesToAddress([]byte("receiver"))
+		genesisConfig *core.Genesis
 		preimages     = ctx.Bool(DumpFlag.Name)
 		blobHashes    []common.Hash // TODO (MariusVanDerWijden) implement blob hashes in state tests
 	)
@@ -133,30 +139,30 @@ func runCmd(ctx *cli.Context) error {
 	} else {
 		debugLogger = logger.NewStructLogger(logconfig)
 	}
-
-	initialGas := ctx.Uint64(GasFlag.Name)
-	genesisConfig := new(core.Genesis)
-	genesisConfig.GasLimit = initialGas
 	if ctx.String(GenesisFlag.Name) != "" {
-		genesisConfig = readGenesis(ctx.String(GenesisFlag.Name))
-		if genesisConfig.GasLimit != 0 {
-			initialGas = genesisConfig.GasLimit
-		}
-	} else {
-		genesisConfig.Config = params.AllEthashProtocolChanges
-	}
-
+		gen := readGenesis(ctx.String(GenesisFlag.Name))
+		genesisConfig = gen
 		db := rawdb.NewMemoryDatabase()
 		triedb := trie.NewDatabase(db, &trie.Config{
 			Preimages: preimages,
 			HashDB:    hashdb.Defaults,
 		})
 		defer triedb.Close()
-	genesis := genesisConfig.MustCommit(db, triedb)
+		genesis := gen.MustCommit(db, triedb)
 		sdb := state.NewDatabaseWithNodeDB(db, triedb)
 		statedb, _ = state.New(genesis.Root(), sdb, nil)
-	chainConfig = genesisConfig.Config
-
+		chainConfig = gen.Config
+	} else {
+		db := rawdb.NewMemoryDatabase()
+		triedb := trie.NewDatabase(db, &trie.Config{
+			Preimages: preimages,
+			HashDB:    hashdb.Defaults,
+		})
+		defer triedb.Close()
+		sdb := state.NewDatabaseWithNodeDB(db, triedb)
+		statedb, _ = state.New(types.EmptyRootHash, sdb, nil)
+		genesisConfig = new(core.Genesis)
+	}
 	if ctx.String(SenderFlag.Name) != "" {
 		sender = common.HexToAddress(ctx.String(SenderFlag.Name))
 	}
@@ -210,6 +216,10 @@ func runCmd(ctx *cli.Context) error {
 		}
 		code = common.Hex2Bytes(bin)
 	}
+	initialGas := ctx.Uint64(GasFlag.Name)
+	if genesisConfig.GasLimit != 0 {
+		initialGas = genesisConfig.GasLimit
+	}
 	runtimeConfig := runtime.Config{
 		Origin:      sender,
 		State:       statedb,
@@ -226,6 +236,19 @@ func runCmd(ctx *cli.Context) error {
 		},
 	}
 
+	if cpuProfilePath := ctx.String(CPUProfileFlag.Name); cpuProfilePath != "" {
+		f, err := os.Create(cpuProfilePath)
+		if err != nil {
+			fmt.Println("could not create CPU profile: ", err)
+			os.Exit(1)
+		}
+		if err := pprof.StartCPUProfile(f); err != nil {
+			fmt.Println("could not start CPU profile: ", err)
+			os.Exit(1)
+		}
+		defer pprof.StopCPUProfile()
+	}
+
 	if chainConfig != nil {
 		runtimeConfig.ChainConfig = chainConfig
 	} else {
@@ -273,6 +296,19 @@ func runCmd(ctx *cli.Context) error {
 		fmt.Println(string(statedb.Dump(nil)))
 	}
 
+	if memProfilePath := ctx.String(MemProfileFlag.Name); memProfilePath != "" {
+		f, err := os.Create(memProfilePath)
+		if err != nil {
+			fmt.Println("could not create memory profile: ", err)
+			os.Exit(1)
+		}
+		if err := pprof.WriteHeapProfile(f); err != nil {
+			fmt.Println("could not write memory profile: ", err)
+			os.Exit(1)
+		}
+		f.Close()
+	}
+
 	if ctx.Bool(DebugFlag.Name) {
 		if debugLogger != nil {
 			fmt.Fprintln(os.Stderr, "#### TRACE ####")

cmd/evm/staterunner.go

@@ -28,6 +28,7 @@ import (
 	"github.com/ethereum/go-ethereum/core/state/snapshot"
 	"github.com/ethereum/go-ethereum/core/vm"
 	"github.com/ethereum/go-ethereum/eth/tracers/logger"
+	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/tests"
 	"github.com/urfave/cli/v2"
 )
@@ -51,6 +52,11 @@ type StatetestResult struct {
 }
 
 func stateTestCmd(ctx *cli.Context) error {
+	// Configure the go-ethereum logger
+	glogger := log.NewGlogHandler(log.StreamHandler(os.Stderr, log.TerminalFormat(false)))
+	glogger.Verbosity(log.Lvl(ctx.Int(VerbosityFlag.Name)))
+	log.Root().SetHandler(glogger)
+
 	// Configure the EVM logger
 	config := &logger.Config{
 		EnableMemory:     !ctx.Bool(DisableMemoryFlag.Name),

core/asm/compiler.go

@@ -17,8 +17,6 @@
 package asm
 
 import (
-	"encoding/hex"
-	"errors"
 	"fmt"
 	"math/big"
 	"os"
@@ -32,7 +30,7 @@ import (
 // and holds the tokens for the program.
 type Compiler struct {
 	tokens []token
-	out    []byte
+	binary []interface{}
 
 	labels map[string]int
 
@@ -52,10 +50,12 @@ func NewCompiler(debug bool) *Compiler {
 // Feed feeds tokens in to ch and are interpreted by
 // the compiler.
 //
-// feed is the first pass in the compile stage as it collects the used labels in the
-// program and keeps a program counter which is used to determine the locations of the
-// jump dests. The labels can than be used in the second stage to push labels and
-// determine the right position.
+// feed is the first pass in the compile stage as it
+// collects the used labels in the program and keeps a
+// program counter which is used to determine the locations
+// of the jump dests. The labels can than be used in the
+// second stage to push labels and determine the right
+// position.
 func (c *Compiler) Feed(ch <-chan token) {
 	var prev token
 	for i := range ch {
@@ -79,6 +79,7 @@ func (c *Compiler) Feed(ch <-chan token) {
 				c.pc++
 			}
 		}
+
 		c.tokens = append(c.tokens, i)
 		prev = i
 	}
@@ -87,11 +88,12 @@ func (c *Compiler) Feed(ch <-chan token) {
 	}
 }
 
-// Compile compiles the current tokens and returns a binary string that can be interpreted
-// by the EVM and an error if it failed.
+// Compile compiles the current tokens and returns a
+// binary string that can be interpreted by the EVM
+// and an error if it failed.
 //
-// compile is the second stage in the compile phase which compiles the tokens to EVM
-// instructions.
+// compile is the second stage in the compile phase
+// which compiles the tokens to EVM instructions.
 func (c *Compiler) Compile() (string, []error) {
 	var errors []error
 	// continue looping over the tokens until
@@ -103,8 +105,16 @@ func (c *Compiler) Compile() (string, []error) {
 	}
 
 	// turn the binary to hex
-	h := hex.EncodeToString(c.out)
-	return h, errors
+	var bin strings.Builder
+	for _, v := range c.binary {
+		switch v := v.(type) {
+		case vm.OpCode:
+			bin.WriteString(fmt.Sprintf("%x", []byte{byte(v)}))
+		case []byte:
+			bin.WriteString(fmt.Sprintf("%x", v))
+		}
+	}
+	return bin.String(), errors
 }
 
 // next returns the next token and increments the
@@ -146,73 +156,47 @@ func (c *Compiler) compileLine() error {
 	return nil
 }
 
-// parseNumber compiles the number to bytes
-func parseNumber(tok token) ([]byte, error) {
-	if tok.typ != number {
-		panic("parseNumber of non-number token")
+// compileNumber compiles the number to bytes
+func (c *Compiler) compileNumber(element token) {
+	num := math.MustParseBig256(element.text).Bytes()
+	if len(num) == 0 {
+		num = []byte{0}
 	}
-	num, ok := math.ParseBig256(tok.text)
-	if !ok {
-		return nil, errors.New("invalid number")
-	}
-	bytes := num.Bytes()
-	if len(bytes) == 0 {
-		bytes = []byte{0}
-	}
-	return bytes, nil
+	c.pushBin(num)
 }
 
 // compileElement compiles the element (push & label or both)
 // to a binary representation and may error if incorrect statements
 // where fed.
 func (c *Compiler) compileElement(element token) error {
-	switch {
-	case isJump(element.text):
-		return c.compileJump(element.text)
-	case isPush(element.text):
-		return c.compilePush()
-	default:
-		c.outputOpcode(toBinary(element.text))
-		return nil
-	}
-}
-
-func (c *Compiler) compileJump(jumpType string) error {
+	// check for a jump. jumps must be read and compiled
+	// from right to left.
+	if isJump(element.text) {
 		rvalue := c.next()
 		switch rvalue.typ {
 		case number:
-		numBytes, err := parseNumber(rvalue)
-		if err != nil {
-			return err
-		}
-		c.outputBytes(numBytes)
-
+			// TODO figure out how to return the error properly
+			c.compileNumber(rvalue)
 		case stringValue:
 			// strings are quoted, remove them.
-		str := rvalue.text[1 : len(rvalue.text)-2]
-		c.outputBytes([]byte(str))
-
+			c.pushBin(rvalue.text[1 : len(rvalue.text)-2])
 		case label:
-		c.outputOpcode(vm.PUSH4)
+			c.pushBin(vm.PUSH4)
 			pos := big.NewInt(int64(c.labels[rvalue.text])).Bytes()
 			pos = append(make([]byte, 4-len(pos)), pos...)
-		c.outputBytes(pos)
-
+			c.pushBin(pos)
 		case lineEnd:
-		// push without argument is supported, it just takes the destination from the stack.
 			c.pos--
-
 		default:
 			return compileErr(rvalue, rvalue.text, "number, string or label")
 		}
 		// push the operation
-	c.outputOpcode(toBinary(jumpType))
+		c.pushBin(toBinary(element.text))
 		return nil
-}
-
-func (c *Compiler) compilePush() error {
+	} else if isPush(element.text) {
 		// handle pushes. pushes are read from left to right.
 		var value []byte
+
 		rvalue := c.next()
 		switch rvalue.typ {
 		case number:
@@ -228,32 +212,31 @@ func (c *Compiler) compilePush() error {
 		default:
 			return compileErr(rvalue, rvalue.text, "number, string or label")
 		}
+
 		if len(value) > 32 {
-		return fmt.Errorf("%d: string or number size > 32 bytes", rvalue.lineno+1)
+			return fmt.Errorf("%d type error: unsupported string or number with size > 32", rvalue.lineno)
 		}
-	c.outputOpcode(vm.OpCode(int(vm.PUSH1) - 1 + len(value)))
-	c.outputBytes(value)
+
+		c.pushBin(vm.OpCode(int(vm.PUSH1) - 1 + len(value)))
+		c.pushBin(value)
+	} else {
+		c.pushBin(toBinary(element.text))
+	}
+
 	return nil
 }
 
 // compileLabel pushes a jumpdest to the binary slice.
 func (c *Compiler) compileLabel() {
-	c.outputOpcode(vm.JUMPDEST)
+	c.pushBin(vm.JUMPDEST)
 }
 
-func (c *Compiler) outputOpcode(op vm.OpCode) {
+// pushBin pushes the value v to the binary stack.
+func (c *Compiler) pushBin(v interface{}) {
 	if c.debug {
-		fmt.Printf("%d: %v\n", len(c.out), op)
+		fmt.Printf("%d: %v\n", len(c.binary), v)
 	}
-	c.out = append(c.out, byte(op))
-}
-
-// output pushes the value v to the binary stack.
-func (c *Compiler) outputBytes(b []byte) {
-	if c.debug {
-		fmt.Printf("%d: %x\n", len(c.out), b)
-	}
-	c.out = append(c.out, b...)
+	c.binary = append(c.binary, v)
 }
 
 // isPush returns whether the string op is either any of
@@ -280,13 +263,13 @@ type compileError struct {
 }
 
 func (err compileError) Error() string {
-	return fmt.Sprintf("%d: syntax error: unexpected %v, expected %v", err.lineno, err.got, err.want)
+	return fmt.Sprintf("%d syntax error: unexpected %v, expected %v", err.lineno, err.got, err.want)
 }
 
 func compileErr(c token, got, want string) error {
 	return compileError{
 		got:    got,
 		want:   want,
-		lineno: c.lineno + 1,
+		lineno: c.lineno,
 	}
 }

core/asm/compiler_test.go

@@ -54,14 +54,6 @@ func TestCompiler(t *testing.T) {
 `,
 			output: "6300000006565b",
 		},
-		{
-			input: `
-	JUMP @label
-label: ;; comment
-	ADD ;; comment
-`,
-			output: "6300000006565b01",
-		},
 	}
 	for _, test := range tests {
 		ch := Lex([]byte(test.input), false)

core/asm/lex_test.go

@@ -72,16 +72,6 @@ func TestLexer(t *testing.T) {
 			input:  "@label123",
 			tokens: []token{{typ: lineStart}, {typ: label, text: "label123"}, {typ: eof}},
 		},
-		// comment after label
-		{
-			input:  "@label123 ;; comment",
-			tokens: []token{{typ: lineStart}, {typ: label, text: "label123"}, {typ: eof}},
-		},
-		// comment after instruction
-		{
-			input:  "push 3 ;; comment\nadd",
-			tokens: []token{{typ: lineStart}, {typ: element, text: "push"}, {typ: number, text: "3"}, {typ: lineEnd, text: "\n"}, {typ: lineStart, lineno: 1}, {typ: element, lineno: 1, text: "add"}, {typ: eof, lineno: 1}},
-		},
 	}
 
 	for _, test := range tests {

core/asm/lexer.go

@@ -42,8 +42,6 @@ type token struct {
 // is able to parse and return.
 type tokenType int
 
-//go:generate go run golang.org/x/tools/cmd/stringer -type tokenType
-
 const (
 	eof              tokenType = iota // end of file
 	lineStart                         // emitted when a line starts
@@ -54,13 +52,31 @@ const (
 	labelDef                          // label definition is emitted when a new label is found
 	number                            // number is emitted when a number is found
 	stringValue                       // stringValue is emitted when a string has been found
+
+	Numbers            = "1234567890"                                           // characters representing any decimal number
+	HexadecimalNumbers = Numbers + "aAbBcCdDeEfF"                               // characters representing any hexadecimal
+	Alpha              = "abcdefghijklmnopqrstuwvxyzABCDEFGHIJKLMNOPQRSTUWVXYZ" // characters representing alphanumeric
 )
 
-const (
-	decimalNumbers = "1234567890"                                           // characters representing any decimal number
-	hexNumbers     = decimalNumbers + "aAbBcCdDeEfF"                        // characters representing any hexadecimal
-	alpha          = "abcdefghijklmnopqrstuwvxyzABCDEFGHIJKLMNOPQRSTUWVXYZ" // characters representing alphanumeric
-)
+// String implements stringer
+func (it tokenType) String() string {
+	if int(it) > len(stringtokenTypes) {
+		return "invalid"
+	}
+	return stringtokenTypes[it]
+}
+
+var stringtokenTypes = []string{
+	eof:              "EOF",
+	lineStart:        "new line",
+	lineEnd:          "end of line",
+	invalidStatement: "invalid statement",
+	element:          "element",
+	label:            "label",
+	labelDef:         "label definition",
+	number:           "number",
+	stringValue:      "string",
+}
 
 // lexer is the basic construct for parsing
 // source code and turning them in to tokens.
@@ -184,6 +200,7 @@ func lexLine(l *lexer) stateFn {
 			l.emit(lineEnd)
 			l.ignore()
 			l.lineno++
+
 			l.emit(lineStart)
 		case r == ';' && l.peek() == ';':
 			return lexComment
@@ -208,7 +225,6 @@ func lexLine(l *lexer) stateFn {
 // of the line and discards the text.
 func lexComment(l *lexer) stateFn {
 	l.acceptRunUntil('\n')
-	l.backup()
 	l.ignore()
 
 	return lexLine
@@ -218,7 +234,7 @@ func lexComment(l *lexer) stateFn {
 // the lex text state function to advance the parsing
 // process.
 func lexLabel(l *lexer) stateFn {
-	l.acceptRun(alpha + "_" + decimalNumbers)
+	l.acceptRun(Alpha + "_" + Numbers)
 
 	l.emit(label)
 
@@ -237,9 +253,9 @@ func lexInsideString(l *lexer) stateFn {
 }
 
 func lexNumber(l *lexer) stateFn {
-	acceptance := decimalNumbers
+	acceptance := Numbers
 	if l.accept("xX") {
-		acceptance = hexNumbers
+		acceptance = HexadecimalNumbers
 	}
 	l.acceptRun(acceptance)
 
@@ -249,7 +265,7 @@ func lexNumber(l *lexer) stateFn {
 }
 
 func lexElement(l *lexer) stateFn {
-	l.acceptRun(alpha + "_" + decimalNumbers)
+	l.acceptRun(Alpha + "_" + Numbers)
 
 	if l.peek() == ':' {
 		l.emit(labelDef)

core/asm/tokentype_string.go

@@ -1,31 +0,0 @@
-// Code generated by "stringer -type tokenType"; DO NOT EDIT.
-
-package asm
-
-import "strconv"
-
-func _() {
-	// An "invalid array index" compiler error signifies that the constant values have changed.
-	// Re-run the stringer command to generate them again.
-	var x [1]struct{}
-	_ = x[eof-0]
-	_ = x[lineStart-1]
-	_ = x[lineEnd-2]
-	_ = x[invalidStatement-3]
-	_ = x[element-4]
-	_ = x[label-5]
-	_ = x[labelDef-6]
-	_ = x[number-7]
-	_ = x[stringValue-8]
-}
-
-const _tokenType_name = "eoflineStartlineEndinvalidStatementelementlabellabelDefnumberstringValue"
-
-var _tokenType_index = [...]uint8{0, 3, 12, 19, 35, 42, 47, 55, 61, 72}
-
-func (i tokenType) String() string {
-	if i < 0 || i >= tokenType(len(_tokenType_index)-1) {
-		return "tokenType(" + strconv.FormatInt(int64(i), 10) + ")"
-	}
-	return _tokenType_name[_tokenType_index[i]:_tokenType_index[i+1]]
-}