How to use typ method of serializer Package

Best Syzkaller code snippet using serializer.typ

encoding.go

Source:encoding.go Github

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...38 ctx.call(c)39 }40 return ctx.buf.Bytes()41}42type serializer struct {43 target *Target44 buf *bytes.Buffer45 vars map[*ResultArg]int46 varSeq int47 verbose bool48}49func (ctx *serializer) printf(text string, args ...interface{}) {50 fmt.Fprintf(ctx.buf, text, args...)51}52func (ctx *serializer) allocVarID(arg *ResultArg) int {53 id := ctx.varSeq54 ctx.varSeq++55 ctx.vars[arg] = id56 return id57}58func (ctx *serializer) call(c *Call) {59 if c.Ret != nil && len(c.Ret.uses) != 0 {60 ctx.printf("r%v = ", ctx.allocVarID(c.Ret))61 }62 ctx.printf("%v(", c.Meta.Name)63 for i, a := range c.Args {64 if IsPad(a.Type()) {65 continue66 }67 if i != 0 {68 ctx.printf(", ")69 }70 ctx.arg(a)71 }72 ctx.printf(")\n")73}74func (ctx *serializer) arg(arg Arg) {75 if arg == nil {76 ctx.printf("nil")77 return78 }79 arg.serialize(ctx)80}81func (a *ConstArg) serialize(ctx *serializer) {82 ctx.printf("0x%x", a.Val)83}84func (a *PointerArg) serialize(ctx *serializer) {85 if a.IsSpecial() {86 ctx.printf("0x%x", a.Address)87 return88 }89 target := ctx.target90 ctx.printf("&%v", target.serializeAddr(a))91 if a.Res != nil && !ctx.verbose && isDefault(a.Res) && !target.isAnyPtr(a.Type()) {92 return93 }94 ctx.printf("=")95 if target.isAnyPtr(a.Type()) {96 ctx.printf("ANY=")97 }98 ctx.arg(a.Res)99}100func (a *DataArg) serialize(ctx *serializer) {101 typ := a.Type().(*BufferType)102 if a.Dir() == DirOut {103 ctx.printf("\"\"/%v", a.Size())104 return105 }106 data := a.Data()107 // Statically typed data will be padded with 0s during deserialization,108 // so we can strip them here for readability always. For variable-size109 // data we strip trailing 0s only if we strip enough of them.110 sz := len(data)111 for len(data) >= 2 && data[len(data)-1] == 0 && data[len(data)-2] == 0 {112 data = data[:len(data)-1]113 }114 if typ.Varlen() && len(data)+8 >= sz {115 data = data[:sz]116 }117 serializeData(ctx.buf, data, isReadableDataType(typ))118 if typ.Varlen() && sz != len(data) {119 ctx.printf("/%v", sz)120 }121}122func (a *GroupArg) serialize(ctx *serializer) {123 var delims []byte124 switch a.Type().(type) {125 case *StructType:126 delims = []byte{'{', '}'}127 case *ArrayType:128 delims = []byte{'[', ']'}129 default:130 panic("unknown group type")131 }132 ctx.buf.WriteByte(delims[0])133 lastNonDefault := len(a.Inner) - 1134 if !ctx.verbose && a.fixedInnerSize() {135 for ; lastNonDefault >= 0; lastNonDefault-- {136 if !isDefault(a.Inner[lastNonDefault]) {137 break138 }139 }140 }141 for i := 0; i <= lastNonDefault; i++ {142 arg1 := a.Inner[i]143 if arg1 != nil && IsPad(arg1.Type()) {144 continue145 }146 if i != 0 {147 ctx.printf(", ")148 }149 ctx.arg(arg1)150 }151 ctx.buf.WriteByte(delims[1])152}153func (a *UnionArg) serialize(ctx *serializer) {154 typ := a.Type().(*UnionType)155 ctx.printf("@%v", typ.Fields[a.Index].Name)156 if !ctx.verbose && isDefault(a.Option) {157 return158 }159 ctx.printf("=")160 ctx.arg(a.Option)161}162func (a *ResultArg) serialize(ctx *serializer) {163 if len(a.uses) != 0 {164 ctx.printf("<r%v=>", ctx.allocVarID(a))165 }166 if a.Res == nil {167 ctx.printf("0x%x", a.Val)168 return169 }170 id, ok := ctx.vars[a.Res]171 if !ok {172 panic("no result")173 }174 ctx.printf("r%v", id)175 if a.OpDiv != 0 {176 ctx.printf("/%v", a.OpDiv)177 }178 if a.OpAdd != 0 {179 ctx.printf("+%v", a.OpAdd)180 }181}182type DeserializeMode int183const (184 Strict DeserializeMode = iota185 NonStrict DeserializeMode = iota186)187func (target *Target) Deserialize(data []byte, mode DeserializeMode) (*Prog, error) {188 defer func() {189 if err := recover(); err != nil {190 panic(fmt.Errorf("%v\ntarget: %v/%v, rev: %v, mode=%v, prog:\n%q",191 err, target.OS, target.Arch, GitRevision, mode, data))192 }193 }()194 p := newParser(target, data, mode == Strict)195 prog, err := p.parseProg()196 if err := p.Err(); err != nil {197 return nil, err198 }199 if err != nil {200 return nil, err201 }202 // This validation is done even in non-debug mode because deserialization203 // procedure does not catch all bugs (e.g. mismatched types).204 // And we can receive bad programs from corpus and hub.205 if err := prog.validate(); err != nil {206 return nil, err207 }208 if p.autos != nil {209 p.fixupAutos(prog)210 }211 if err := prog.sanitize(mode == NonStrict); err != nil {212 return nil, err213 }214 return prog, nil215}216func (p *parser) parseProg() (*Prog, error) {217 prog := &Prog{218 Target: p.target,219 }220 for p.Scan() {221 if p.EOF() {222 if p.comment != "" {223 prog.Comments = append(prog.Comments, p.comment)224 p.comment = ""225 }226 continue227 }228 if p.Char() == '#' {229 if p.comment != "" {230 prog.Comments = append(prog.Comments, p.comment)231 }232 p.comment = strings.TrimSpace(p.s[p.i+1:])233 continue234 }235 name := p.Ident()236 r := ""237 if p.Char() == '=' {238 r = name239 p.Parse('=')240 name = p.Ident()241 }242 meta := p.target.SyscallMap[name]243 if meta == nil {244 return nil, fmt.Errorf("unknown syscall %v", name)245 }246 c := &Call{247 Meta: meta,248 Ret: MakeReturnArg(meta.Ret),249 Comment: p.comment,250 }251 prog.Calls = append(prog.Calls, c)252 p.Parse('(')253 for i := 0; p.Char() != ')'; i++ {254 if i >= len(meta.Args) {255 p.eatExcessive(false, "excessive syscall arguments")256 break257 }258 field := meta.Args[i]259 if IsPad(field.Type) {260 return nil, fmt.Errorf("padding in syscall %v arguments", name)261 }262 arg, err := p.parseArg(field.Type, DirIn)263 if err != nil {264 return nil, err265 }266 c.Args = append(c.Args, arg)267 if p.Char() != ')' {268 p.Parse(',')269 }270 }271 p.Parse(')')272 p.SkipWs()273 if !p.EOF() {274 if p.Char() != '#' {275 return nil, fmt.Errorf("tailing data (line #%v)", p.l)276 }277 if c.Comment != "" {278 prog.Comments = append(prog.Comments, c.Comment)279 }280 c.Comment = strings.TrimSpace(p.s[p.i+1:])281 }282 for i := len(c.Args); i < len(meta.Args); i++ {283 p.strictFailf("missing syscall args")284 c.Args = append(c.Args, meta.Args[i].DefaultArg(DirIn))285 }286 if len(c.Args) != len(meta.Args) {287 return nil, fmt.Errorf("wrong call arg count: %v, want %v", len(c.Args), len(meta.Args))288 }289 if r != "" && c.Ret != nil {290 p.vars[r] = c.Ret291 }292 p.comment = ""293 }294 if p.comment != "" {295 prog.Comments = append(prog.Comments, p.comment)296 }297 return prog, nil298}299func (p *parser) parseArg(typ Type, dir Dir) (Arg, error) {300 r := ""301 if p.Char() == '<' {302 p.Parse('<')303 r = p.Ident()304 p.Parse('=')305 p.Parse('>')306 }307 arg, err := p.parseArgImpl(typ, dir)308 if err != nil {309 return nil, err310 }311 if arg == nil {312 if typ != nil {313 arg = typ.DefaultArg(dir)314 } else if r != "" {315 return nil, fmt.Errorf("named nil argument")316 }317 }318 if r != "" {319 if res, ok := arg.(*ResultArg); ok {320 p.vars[r] = res321 }322 }323 return arg, nil324}325func (p *parser) parseArgImpl(typ Type, dir Dir) (Arg, error) {326 if typ == nil && p.Char() != 'n' {327 p.eatExcessive(true, "non-nil argument for nil type")328 return nil, nil329 }330 switch p.Char() {331 case '0':332 return p.parseArgInt(typ, dir)333 case 'r':334 return p.parseArgRes(typ, dir)335 case '&':336 return p.parseArgAddr(typ, dir)337 case '"', '\'':338 return p.parseArgString(typ, dir)339 case '{':340 return p.parseArgStruct(typ, dir)341 case '[':342 return p.parseArgArray(typ, dir)343 case '@':344 return p.parseArgUnion(typ, dir)345 case 'n':346 p.Parse('n')347 p.Parse('i')348 p.Parse('l')349 return nil, nil350 case 'A':351 p.Parse('A')352 p.Parse('U')353 p.Parse('T')354 p.Parse('O')355 return p.parseAuto(typ, dir)356 default:357 return nil, fmt.Errorf("failed to parse argument at '%c' (line #%v/%v: %v)",358 p.Char(), p.l, p.i, p.s)359 }360}361func (p *parser) parseArgInt(typ Type, dir Dir) (Arg, error) {362 val := p.Ident()363 v, err := strconv.ParseUint(val, 0, 64)364 if err != nil {365 return nil, fmt.Errorf("wrong arg value '%v': %v", val, err)366 }367 switch typ.(type) {368 case *ConstType, *IntType, *FlagsType, *ProcType, *CsumType:369 arg := Arg(MakeConstArg(typ, dir, v))370 if dir == DirOut && !typ.isDefaultArg(arg) {371 p.strictFailf("out arg %v has non-default value: %v", typ, v)372 arg = typ.DefaultArg(dir)373 }374 return arg, nil375 case *LenType:376 return MakeConstArg(typ, dir, v), nil377 case *ResourceType:378 return MakeResultArg(typ, dir, nil, v), nil379 case *PtrType, *VmaType:380 index := -v % uint64(len(p.target.SpecialPointers))381 return MakeSpecialPointerArg(typ, dir, index), nil382 default:383 p.eatExcessive(true, "wrong int arg %T", typ)384 return typ.DefaultArg(dir), nil385 }386}387func (p *parser) parseAuto(typ Type, dir Dir) (Arg, error) {388 switch typ.(type) {389 case *ConstType, *LenType, *CsumType:390 return p.auto(MakeConstArg(typ, dir, 0)), nil391 default:392 return nil, fmt.Errorf("wrong type %T for AUTO", typ)393 }394}395func (p *parser) parseArgRes(typ Type, dir Dir) (Arg, error) {396 id := p.Ident()397 var div, add uint64398 if p.Char() == '/' {399 p.Parse('/')400 op := p.Ident()401 v, err := strconv.ParseUint(op, 0, 64)402 if err != nil {403 return nil, fmt.Errorf("wrong result div op: '%v'", op)404 }405 div = v406 }407 if p.Char() == '+' {408 p.Parse('+')409 op := p.Ident()410 v, err := strconv.ParseUint(op, 0, 64)411 if err != nil {412 return nil, fmt.Errorf("wrong result add op: '%v'", op)413 }414 add = v415 }416 v := p.vars[id]417 if v == nil {418 p.strictFailf("undeclared variable %v", id)419 return typ.DefaultArg(dir), nil420 }421 arg := MakeResultArg(typ, dir, v, 0)422 arg.OpDiv = div423 arg.OpAdd = add424 return arg, nil425}426func (p *parser) parseArgAddr(typ Type, dir Dir) (Arg, error) {427 var elem Type428 elemDir := DirInOut429 switch t1 := typ.(type) {430 case *PtrType:431 elem, elemDir = t1.Elem, t1.ElemDir432 case *VmaType:433 default:434 p.eatExcessive(true, "wrong addr arg")435 return typ.DefaultArg(dir), nil436 }437 p.Parse('&')438 auto := false439 var addr, vmaSize uint64440 if p.Char() == 'A' {441 p.Parse('A')442 p.Parse('U')443 p.Parse('T')444 p.Parse('O')445 if elem == nil {446 return nil, fmt.Errorf("vma type can't be AUTO")447 }448 auto = true449 } else {450 var err error451 addr, vmaSize, err = p.parseAddr()452 if err != nil {453 return nil, err454 }455 }456 var inner Arg457 if p.Char() == '=' {458 p.Parse('=')459 if p.Char() == 'A' {460 p.Parse('A')461 p.Parse('N')462 p.Parse('Y')463 p.Parse('=')464 anyPtr := p.target.getAnyPtrType(typ.Size())465 typ, elem, elemDir = anyPtr, anyPtr.Elem, anyPtr.ElemDir466 }467 var err error468 inner, err = p.parseArg(elem, elemDir)469 if err != nil {470 return nil, err471 }472 }473 if elem == nil {474 if addr%p.target.PageSize != 0 {475 p.strictFailf("unaligned vma address 0x%x", addr)476 addr &= ^(p.target.PageSize - 1)477 }478 return MakeVmaPointerArg(typ, dir, addr, vmaSize), nil479 }480 if inner == nil {481 inner = elem.DefaultArg(elemDir)482 }483 arg := MakePointerArg(typ, dir, addr, inner)484 if auto {485 p.auto(arg)486 }487 return arg, nil488}489func (p *parser) parseArgString(t Type, dir Dir) (Arg, error) {490 typ, ok := t.(*BufferType)491 if !ok {492 p.eatExcessive(true, "wrong string arg")493 return t.DefaultArg(dir), nil494 }495 data, err := p.deserializeData()496 if err != nil {497 return nil, err498 }499 size := ^uint64(0)500 if p.Char() == '/' {501 p.Parse('/')502 sizeStr := p.Ident()503 size, err = strconv.ParseUint(sizeStr, 0, 64)504 if err != nil {505 return nil, fmt.Errorf("failed to parse buffer size: %q", sizeStr)506 }507 maxMem := p.target.NumPages * p.target.PageSize508 if size > maxMem {509 p.strictFailf("too large string argument %v", size)510 size = maxMem511 }512 }513 if !typ.Varlen() {514 size = typ.Size()515 } else if size == ^uint64(0) {516 size = uint64(len(data))517 }518 if dir == DirOut {519 return MakeOutDataArg(typ, dir, size), nil520 }521 if diff := int(size) - len(data); diff > 0 {522 data = append(data, make([]byte, diff)...)523 }524 data = data[:size]525 if typ.Kind == BufferString && len(typ.Values) != 0 &&526 // AUTOGENERATED will be padded by 0's.527 !strings.HasPrefix(typ.Values[0], "AUTOGENERATED") {528 matched := false529 for _, val := range typ.Values {530 if string(data) == val {531 matched = true532 break533 }534 }535 if !matched {536 p.strictFailf("bad string value %q, expect %q", data, typ.Values)537 data = []byte(typ.Values[0])538 }539 }540 return MakeDataArg(typ, dir, data), nil541}542func (p *parser) parseArgStruct(typ Type, dir Dir) (Arg, error) {543 p.Parse('{')544 t1, ok := typ.(*StructType)545 if !ok {546 p.eatExcessive(false, "wrong struct arg")547 p.Parse('}')548 return typ.DefaultArg(dir), nil549 }550 var inner []Arg551 for i := 0; p.Char() != '}'; i++ {552 if i >= len(t1.Fields) {553 p.eatExcessive(false, "excessive struct %v fields", typ.Name())554 break555 }556 field := t1.Fields[i]557 if IsPad(field.Type) {558 inner = append(inner, MakeConstArg(field.Type, dir, 0))559 } else {560 arg, err := p.parseArg(field.Type, dir)561 if err != nil {562 return nil, err563 }564 inner = append(inner, arg)565 if p.Char() != '}' {566 p.Parse(',')567 }568 }569 }570 p.Parse('}')571 for len(inner) < len(t1.Fields) {572 field := t1.Fields[len(inner)]573 if !IsPad(field.Type) {574 p.strictFailf("missing struct %v fields %v/%v", typ.Name(), len(inner), len(t1.Fields))575 }576 inner = append(inner, field.Type.DefaultArg(dir))577 }578 return MakeGroupArg(typ, dir, inner), nil579}580func (p *parser) parseArgArray(typ Type, dir Dir) (Arg, error) {581 p.Parse('[')582 t1, ok := typ.(*ArrayType)583 if !ok {584 p.eatExcessive(false, "wrong array arg %T", typ)585 p.Parse(']')586 return typ.DefaultArg(dir), nil587 }588 var inner []Arg589 for i := 0; p.Char() != ']'; i++ {590 arg, err := p.parseArg(t1.Elem, dir)591 if err != nil {592 return nil, err593 }594 inner = append(inner, arg)595 if p.Char() != ']' {596 p.Parse(',')597 }598 }599 p.Parse(']')600 if t1.Kind == ArrayRangeLen && t1.RangeBegin == t1.RangeEnd {601 for uint64(len(inner)) < t1.RangeBegin {602 p.strictFailf("missing array elements")603 inner = append(inner, t1.Elem.DefaultArg(dir))604 }605 inner = inner[:t1.RangeBegin]606 }607 return MakeGroupArg(typ, dir, inner), nil608}609func (p *parser) parseArgUnion(typ Type, dir Dir) (Arg, error) {610 t1, ok := typ.(*UnionType)611 if !ok {612 p.eatExcessive(true, "wrong union arg")613 return typ.DefaultArg(dir), nil614 }615 p.Parse('@')616 name := p.Ident()617 var optType Type618 index := -1619 for i, field := range t1.Fields {620 if name == field.Name {621 optType, index = field.Type, i622 break623 }624 }625 if optType == nil {626 p.eatExcessive(true, "wrong union option")627 return typ.DefaultArg(dir), nil628 }629 var opt Arg630 if p.Char() == '=' {631 p.Parse('=')632 var err error633 opt, err = p.parseArg(optType, dir)634 if err != nil {635 return nil, err636 }637 } else {638 opt = optType.DefaultArg(dir)639 }640 return MakeUnionArg(typ, dir, opt, index), nil641}642// Eats excessive call arguments and struct fields to recover after description changes.643func (p *parser) eatExcessive(stopAtComma bool, what string, args ...interface{}) {644 p.strictFailf(what, args...)645 paren, brack, brace := 0, 0, 0646 for !p.EOF() && p.e == nil {647 ch := p.Char()648 switch ch {649 case '(':650 paren++651 case ')':652 if paren == 0 {653 return654 }655 paren--656 case '[':657 brack++658 case ']':659 if brack == 0 {660 return661 }662 brack--663 case '{':664 brace++665 case '}':666 if brace == 0 {667 return668 }669 brace--670 case ',':671 if stopAtComma && paren == 0 && brack == 0 && brace == 0 {672 return673 }674 case '\'', '"':675 p.Parse(ch)676 for !p.EOF() && p.Char() != ch {677 p.Parse(p.Char())678 }679 if p.EOF() {680 return681 }682 }683 p.Parse(ch)684 }685}686const (687 encodingAddrBase = 0x7f0000000000688 maxLineLen = 1 << 20689)690func (target *Target) serializeAddr(arg *PointerArg) string {691 ssize := ""692 if arg.VmaSize != 0 {693 ssize = fmt.Sprintf("/0x%x", arg.VmaSize)694 }695 return fmt.Sprintf("(0x%x%v)", encodingAddrBase+arg.Address, ssize)696}697func (p *parser) parseAddr() (uint64, uint64, error) {698 p.Parse('(')699 pstr := p.Ident()700 addr, err := strconv.ParseUint(pstr, 0, 64)701 if err != nil {702 return 0, 0, fmt.Errorf("failed to parse addr: %q", pstr)703 }704 if addr < encodingAddrBase {705 return 0, 0, fmt.Errorf("address without base offset: %q", pstr)706 }707 addr -= encodingAddrBase708 // This is not used anymore, but left here to parse old programs.709 if p.Char() == '+' || p.Char() == '-' {710 minus := false711 if p.Char() == '-' {712 minus = true713 p.Parse('-')714 } else {715 p.Parse('+')716 }717 ostr := p.Ident()718 off, err := strconv.ParseUint(ostr, 0, 64)719 if err != nil {720 return 0, 0, fmt.Errorf("failed to parse addr offset: %q", ostr)721 }722 if minus {723 off = -off724 }725 addr += off726 }727 target := p.target728 maxMem := target.NumPages * target.PageSize729 var vmaSize uint64730 if p.Char() == '/' {731 p.Parse('/')732 pstr := p.Ident()733 size, err := strconv.ParseUint(pstr, 0, 64)734 if err != nil {735 return 0, 0, fmt.Errorf("failed to parse addr size: %q", pstr)736 }737 addr = addr & ^(target.PageSize - 1)738 vmaSize = (size + target.PageSize - 1) & ^(target.PageSize - 1)739 if vmaSize == 0 {740 vmaSize = target.PageSize741 }742 if vmaSize > maxMem {743 vmaSize = maxMem744 }745 if addr > maxMem-vmaSize {746 addr = maxMem - vmaSize747 }748 }749 p.Parse(')')750 return addr, vmaSize, nil751}752func serializeData(buf *bytes.Buffer, data []byte, readable bool) {753 if !readable && !isReadableData(data) {754 fmt.Fprintf(buf, "\"%v\"", hex.EncodeToString(data))755 return756 }757 buf.WriteByte('\'')758 encodeData(buf, data, true, false)759 buf.WriteByte('\'')760}761func EncodeData(buf *bytes.Buffer, data []byte, readable bool) {762 if !readable && isReadableData(data) {763 readable = true764 }765 encodeData(buf, data, readable, true)766}767func encodeData(buf *bytes.Buffer, data []byte, readable, cstr bool) {768 for _, v := range data {769 if !readable {770 lo, hi := byteToHex(v)771 buf.Write([]byte{'\\', 'x', hi, lo})772 continue773 }774 switch v {775 case '\a':776 buf.Write([]byte{'\\', 'a'})777 case '\b':778 buf.Write([]byte{'\\', 'b'})779 case '\f':780 buf.Write([]byte{'\\', 'f'})781 case '\n':782 buf.Write([]byte{'\\', 'n'})783 case '\r':784 buf.Write([]byte{'\\', 'r'})785 case '\t':786 buf.Write([]byte{'\\', 't'})787 case '\v':788 buf.Write([]byte{'\\', 'v'})789 case '\'':790 buf.Write([]byte{'\\', '\''})791 case '"':792 buf.Write([]byte{'\\', '"'})793 case '\\':794 buf.Write([]byte{'\\', '\\'})795 default:796 if isPrintable(v) {797 buf.WriteByte(v)798 } else {799 if cstr {800 // We would like to use hex encoding with \x,801 // but C's \x is hard to use: it can contain _any_ number of hex digits802 // (not just 2 or 4), so later non-hex encoded chars will glue to \x.803 c0 := (v>>6)&0x7 + '0'804 c1 := (v>>3)&0x7 + '0'805 c2 := (v>>0)&0x7 + '0'806 buf.Write([]byte{'\\', c0, c1, c2})807 } else {808 lo, hi := byteToHex(v)809 buf.Write([]byte{'\\', 'x', hi, lo})810 }811 }812 }813 }814}815func isReadableDataType(typ *BufferType) bool {816 return typ.Kind == BufferString || typ.Kind == BufferFilename817}818func isReadableData(data []byte) bool {819 if len(data) == 0 {820 return false821 }822 for _, v := range data {823 if isPrintable(v) {824 continue825 }826 switch v {827 case 0, '\a', '\b', '\f', '\n', '\r', '\t', '\v':828 continue829 }830 return false831 }832 return true833}834func (p *parser) deserializeData() ([]byte, error) {835 var data []byte836 if p.Char() == '"' {837 p.Parse('"')838 val := ""839 if p.Char() != '"' {840 val = p.Ident()841 }842 p.Parse('"')843 var err error844 data, err = hex.DecodeString(val)845 if err != nil {846 return nil, fmt.Errorf("data arg has bad value %q", val)847 }848 } else {849 if p.consume() != '\'' {850 return nil, fmt.Errorf("data arg does not start with \" nor with '")851 }852 for p.Char() != '\'' && p.Char() != 0 {853 v := p.consume()854 if v != '\\' {855 data = append(data, v)856 continue857 }858 v = p.consume()859 switch v {860 case 'x':861 hi := p.consume()862 lo := p.consume()863 b, ok := hexToByte(lo, hi)864 if !ok {865 return nil, fmt.Errorf("invalid hex \\x%v%v in data arg", hi, lo)866 }867 data = append(data, b)868 case 'a':869 data = append(data, '\a')870 case 'b':871 data = append(data, '\b')872 case 'f':873 data = append(data, '\f')874 case 'n':875 data = append(data, '\n')876 case 'r':877 data = append(data, '\r')878 case 't':879 data = append(data, '\t')880 case 'v':881 data = append(data, '\v')882 case '\'':883 data = append(data, '\'')884 case '"':885 data = append(data, '"')886 case '\\':887 data = append(data, '\\')888 default:889 return nil, fmt.Errorf("invalid \\%c escape sequence in data arg", v)890 }891 }892 p.Parse('\'')893 }894 return data, nil895}896func isPrintable(v byte) bool {897 return v >= 0x20 && v < 0x7f898}899func byteToHex(v byte) (lo, hi byte) {900 return toHexChar(v & 0xf), toHexChar(v >> 4)901}902func hexToByte(lo, hi byte) (byte, bool) {903 h, ok1 := fromHexChar(hi)904 l, ok2 := fromHexChar(lo)905 return h<<4 + l, ok1 && ok2906}907func toHexChar(v byte) byte {908 if v >= 16 {909 panic("bad hex char")910 }911 if v < 10 {912 return '0' + v913 }914 return 'a' + v - 10915}916func fromHexChar(v byte) (byte, bool) {917 if v >= '0' && v <= '9' {918 return v - '0', true919 }920 if v >= 'a' && v <= 'f' {921 return v - 'a' + 10, true922 }923 return 0, false924}925type parser struct {926 target *Target927 strict bool928 vars map[string]*ResultArg929 autos map[Arg]bool930 comment string931 r *bufio.Scanner932 s string933 i int934 l int935 e error936}937func newParser(target *Target, data []byte, strict bool) *parser {938 p := &parser{939 target: target,940 strict: strict,941 vars: make(map[string]*ResultArg),942 r: bufio.NewScanner(bytes.NewReader(data)),943 }944 p.r.Buffer(nil, maxLineLen)945 return p946}947func (p *parser) auto(arg Arg) Arg {948 if p.autos == nil {949 p.autos = make(map[Arg]bool)950 }951 p.autos[arg] = true952 return arg953}954func (p *parser) fixupAutos(prog *Prog) {955 s := analyze(nil, nil, prog, nil)956 for _, c := range prog.Calls {957 p.target.assignSizesArray(c.Args, c.Meta.Args, p.autos)958 ForeachArg(c, func(arg Arg, _ *ArgCtx) {959 if !p.autos[arg] {960 return961 }962 delete(p.autos, arg)963 switch typ := arg.Type().(type) {964 case *ConstType:965 arg.(*ConstArg).Val = typ.Val966 _ = s967 case *PtrType:968 a := arg.(*PointerArg)969 a.Address = s.ma.alloc(nil, a.Res.Size())970 default:971 panic(fmt.Sprintf("unsupported auto type %T", typ))972 }973 })974 }975 if len(p.autos) != 0 {976 panic(fmt.Sprintf("leftoever autos: %+v", p.autos))977 }978}979func (p *parser) Scan() bool {980 if p.e != nil {981 return false982 }983 if !p.r.Scan() {984 p.e = p.r.Err()985 return false...

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file.go

Source:file.go Github

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...15 "os"16 "github.com/apache/arrow/go/arrow/array"17 "github.com/cockroachdb/cockroach/pkg/col/coldata"18 "github.com/cockroachdb/cockroach/pkg/col/colserde/arrowserde"19 "github.com/cockroachdb/cockroach/pkg/col/typeconv"20 "github.com/cockroachdb/cockroach/pkg/sql/pgwire/pgcode"21 "github.com/cockroachdb/cockroach/pkg/sql/pgwire/pgerror"22 "github.com/cockroachdb/cockroach/pkg/sql/types"23 "github.com/cockroachdb/errors"24 mmap "github.com/edsrzf/mmap-go"25 flatbuffers "github.com/google/flatbuffers/go"26)27const fileMagic = `ARROW1`28var fileMagicPadding [8 - len(fileMagic)]byte29type fileBlock struct {30 offset int6431 metadataLen int3232 bodyLen int6433}34// FileSerializer converts our in-mem columnar batch representation into the35// arrow specification's file format. All batches serialized to a file must have36// the same schema.37type FileSerializer struct {38 scratch [4]byte39 w *countingWriter40 typs []*types.T41 fb *flatbuffers.Builder42 a *ArrowBatchConverter43 rb *RecordBatchSerializer44 recordBatches []fileBlock45}46// NewFileSerializer creates a FileSerializer for the given types. The caller is47// responsible for closing the given writer.48func NewFileSerializer(w io.Writer, typs []*types.T) (*FileSerializer, error) {49 a, err := NewArrowBatchConverter(typs)50 if err != nil {51 return nil, err52 }53 rb, err := NewRecordBatchSerializer(typs)54 if err != nil {55 return nil, err56 }57 s := &FileSerializer{58 typs: typs,59 fb: flatbuffers.NewBuilder(flatbufferBuilderInitialCapacity),60 a: a,61 rb: rb,62 }63 return s, s.Reset(w)64}65// Reset can be called to reuse this FileSerializer with a new io.Writer after66// calling Finish. The types will remain the ones passed to the constructor. The67// caller is responsible for closing the given writer.68func (s *FileSerializer) Reset(w io.Writer) error {69 if s.w != nil {70 return errors.New(`Finish must be called before Reset`)71 }72 s.w = &countingWriter{wrapped: w}73 s.recordBatches = s.recordBatches[:0]74 if _, err := io.WriteString(s.w, fileMagic); err != nil {75 return err76 }77 // Pad to 8 byte boundary.78 if _, err := s.w.Write(fileMagicPadding[:]); err != nil {79 return err80 }81 // The file format is a wrapper around the streaming format and the streaming82 // format starts with a Schema message.83 s.fb.Reset()84 messageOffset := schemaMessage(s.fb, s.typs)85 s.fb.Finish(messageOffset)86 schemaBytes := s.fb.FinishedBytes()87 if _, err := s.w.Write(schemaBytes); err != nil {88 return err89 }90 _, err := s.w.Write(make([]byte, calculatePadding(len(schemaBytes))))91 return err92}93// AppendBatch adds one batch of columnar data to the file.94func (s *FileSerializer) AppendBatch(batch coldata.Batch) error {95 offset := int64(s.w.written)96 arrow, err := s.a.BatchToArrow(batch)97 if err != nil {98 return err99 }100 metadataLen, bodyLen, err := s.rb.Serialize(s.w, arrow, batch.Length())101 if err != nil {102 return err103 }104 s.recordBatches = append(s.recordBatches, fileBlock{105 offset: offset,106 metadataLen: int32(metadataLen),107 bodyLen: int64(bodyLen),108 })109 return nil110}111// Finish writes the footer metadata described by the arrow spec. Nothing can be112// called after Finish except Reset.113func (s *FileSerializer) Finish() error {114 defer func() {115 s.w = nil116 }()117 // Write the footer flatbuffer, which has byte offsets of all the record118 // batch messages in the file.119 s.fb.Reset()120 footerOffset := fileFooter(s.fb, s.typs, s.recordBatches)121 s.fb.Finish(footerOffset)122 footerBytes := s.fb.FinishedBytes()123 if _, err := s.w.Write(footerBytes); err != nil {124 return err125 }126 // For the footer, and only the footer, the spec requires the length _after_127 // the footer so that it can be read by starting at the back of the file and128 // working forward.129 binary.LittleEndian.PutUint32(s.scratch[:], uint32(len(footerBytes)))130 if _, err := s.w.Write(s.scratch[:]); err != nil {131 return err132 }133 // Spec wants the magic again here.134 _, err := io.WriteString(s.w, fileMagic)135 return err136}137// FileDeserializer decodes columnar data batches from files encoded according138// to the arrow spec.139type FileDeserializer struct {140 buf []byte141 bufCloseFn func() error142 recordBatches []fileBlock143 idx int144 end int145 typs []*types.T146 a *ArrowBatchConverter147 rb *RecordBatchSerializer148 arrowScratch []*array.Data149}150// NewFileDeserializerFromBytes constructs a FileDeserializer for an in-memory151// buffer.152func NewFileDeserializerFromBytes(typs []*types.T, buf []byte) (*FileDeserializer, error) {153 return newFileDeserializer(typs, buf, func() error { return nil })154}155// NewFileDeserializerFromPath constructs a FileDeserializer by reading it from156// a file.157func NewFileDeserializerFromPath(typs []*types.T, path string) (*FileDeserializer, error) {158 f, err := os.Open(path)159 if err != nil {160 return nil, pgerror.Wrapf(err, pgcode.Io, `opening %s`, path)161 }162 // TODO(dan): This is currently using copy on write semantics because we store163 // the nulls differently in-mem than arrow does and there's an in-place164 // conversion. If we used the same format that arrow does, this could be165 // switched to mmap.RDONLY (it's easy to check, the test fails with a SIGBUS166 // right now with mmap.RDONLY).167 buf, err := mmap.Map(f, mmap.COPY, 0 /* flags */)168 if err != nil {169 return nil, pgerror.Wrapf(err, pgcode.Io, `mmaping %s`, path)170 }171 return newFileDeserializer(typs, buf, buf.Unmap)172}173func newFileDeserializer(174 typs []*types.T, buf []byte, bufCloseFn func() error,175) (*FileDeserializer, error) {176 d := &FileDeserializer{177 buf: buf,178 bufCloseFn: bufCloseFn,179 end: len(buf),180 }181 var err error182 if err = d.init(); err != nil {183 return nil, err184 }185 d.typs = typs186 if d.a, err = NewArrowBatchConverter(typs); err != nil {187 return nil, err188 }189 if d.rb, err = NewRecordBatchSerializer(typs); err != nil {190 return nil, err191 }192 d.arrowScratch = make([]*array.Data, 0, len(typs))193 return d, nil194}195// Close releases any resources held by this deserializer.196func (d *FileDeserializer) Close() error {197 return d.bufCloseFn()198}199// Typs returns the in-memory types for the data stored in this file.200func (d *FileDeserializer) Typs() []*types.T {201 return d.typs202}203// NumBatches returns the number of record batches stored in this file.204func (d *FileDeserializer) NumBatches() int {205 return len(d.recordBatches)206}207// GetBatch fills in the given in-mem batch with the requested on-disk data.208func (d *FileDeserializer) GetBatch(batchIdx int, b coldata.Batch) error {209 rb := d.recordBatches[batchIdx]210 d.idx = int(rb.offset)211 buf, err := d.read(metadataLengthNumBytes + int(rb.metadataLen) + int(rb.bodyLen))212 if err != nil {213 return err214 }215 d.arrowScratch = d.arrowScratch[:0]216 batchLength, err := d.rb.Deserialize(&d.arrowScratch, buf)217 if err != nil {218 return err219 }220 return d.a.ArrowToBatch(d.arrowScratch, batchLength, b)221}222// read gets the next `n` bytes from the start of the buffer, consuming them.223func (d *FileDeserializer) read(n int) ([]byte, error) {224 if d.idx+n > d.end {225 return nil, io.EOF226 }227 start := d.idx228 d.idx += n229 return d.buf[start:d.idx], nil230}231// readBackward gets the `n` bytes from the end of the buffer, consuming them.232func (d *FileDeserializer) readBackward(n int) ([]byte, error) {233 if d.idx+n > d.end {234 return nil, io.EOF235 }236 end := d.end237 d.end -= n238 return d.buf[d.end:end], nil239}240// init verifies the file magic and headers. After init, the `idx` and `end`241// fields are set to the range of record batches and dictionary batches242// described by the arrow spec's streaming format.243func (d *FileDeserializer) init() error {244 // Check the header magic245 if magic, err := d.read(8); err != nil {246 return pgerror.Wrap(err, pgcode.DataException, `verifying arrow file header magic`)247 } else if !bytes.Equal([]byte(fileMagic), magic[:len(fileMagic)]) {248 return errors.New(`arrow file header magic mismatch`)249 }250 if magic, err := d.readBackward(len(fileMagic)); err != nil {251 return pgerror.Wrap(err, pgcode.DataException, `verifying arrow file footer magic`)252 } else if !bytes.Equal([]byte(fileMagic), magic) {253 return errors.New(`arrow file magic footer mismatch`)254 }255 footerSize, err := d.readBackward(4)256 if err != nil {257 return pgerror.Wrap(err, pgcode.DataException, `reading arrow file footer`)258 }259 footerBytes, err := d.readBackward(int(binary.LittleEndian.Uint32(footerSize)))260 if err != nil {261 return pgerror.Wrap(err, pgcode.DataException, `reading arrow file footer`)262 }263 footer := arrowserde.GetRootAsFooter(footerBytes, 0)264 if footer.Version() != arrowserde.MetadataVersionV1 {265 return errors.Errorf(`only arrow V1 is supported got %d`, footer.Version())266 }267 var block arrowserde.Block268 d.recordBatches = d.recordBatches[:0]269 for blockIdx := 0; blockIdx < footer.RecordBatchesLength(); blockIdx++ {270 footer.RecordBatches(&block, blockIdx)271 d.recordBatches = append(d.recordBatches, fileBlock{272 offset: block.Offset(),273 metadataLen: block.MetaDataLength(),274 bodyLen: block.BodyLength(),275 })276 }277 return nil278}279type countingWriter struct {280 wrapped io.Writer281 written int282}283func (w *countingWriter) Write(buf []byte) (int, error) {284 n, err := w.wrapped.Write(buf)285 w.written += n286 return n, err287}288func schema(fb *flatbuffers.Builder, typs []*types.T) flatbuffers.UOffsetT {289 fieldOffsets := make([]flatbuffers.UOffsetT, len(typs))290 for idx, typ := range typs {291 var fbTyp byte292 var fbTypOffset flatbuffers.UOffsetT293 switch typeconv.TypeFamilyToCanonicalTypeFamily(typ.Family()) {294 case types.BoolFamily:295 arrowserde.BoolStart(fb)296 fbTypOffset = arrowserde.BoolEnd(fb)297 fbTyp = arrowserde.TypeBool298 case types.BytesFamily, types.JsonFamily:299 arrowserde.BinaryStart(fb)300 fbTypOffset = arrowserde.BinaryEnd(fb)301 fbTyp = arrowserde.TypeBinary302 case types.IntFamily:303 switch typ.Width() {304 case 16:305 arrowserde.IntStart(fb)306 arrowserde.IntAddBitWidth(fb, 16)307 arrowserde.IntAddIsSigned(fb, 1)308 fbTypOffset = arrowserde.IntEnd(fb)309 fbTyp = arrowserde.TypeInt310 case 32:311 arrowserde.IntStart(fb)312 arrowserde.IntAddBitWidth(fb, 32)313 arrowserde.IntAddIsSigned(fb, 1)314 fbTypOffset = arrowserde.IntEnd(fb)315 fbTyp = arrowserde.TypeInt316 case 0, 64:317 arrowserde.IntStart(fb)318 arrowserde.IntAddBitWidth(fb, 64)319 arrowserde.IntAddIsSigned(fb, 1)320 fbTypOffset = arrowserde.IntEnd(fb)321 fbTyp = arrowserde.TypeInt322 default:323 panic(errors.Errorf(`unexpected int width %d`, typ.Width()))324 }325 case types.FloatFamily:326 arrowserde.FloatingPointStart(fb)327 arrowserde.FloatingPointAddPrecision(fb, arrowserde.PrecisionDOUBLE)328 fbTypOffset = arrowserde.FloatingPointEnd(fb)329 fbTyp = arrowserde.TypeFloatingPoint330 case types.DecimalFamily:331 // Decimals are marshaled into bytes, so we use binary headers.332 arrowserde.BinaryStart(fb)333 fbTypOffset = arrowserde.BinaryEnd(fb)334 fbTyp = arrowserde.TypeDecimal335 case types.TimestampTZFamily:336 // Timestamps are marshaled into bytes, so we use binary headers.337 arrowserde.BinaryStart(fb)338 fbTypOffset = arrowserde.BinaryEnd(fb)339 fbTyp = arrowserde.TypeTimestamp340 case types.IntervalFamily:341 // Intervals are marshaled into bytes, so we use binary headers.342 arrowserde.BinaryStart(fb)343 fbTypOffset = arrowserde.BinaryEnd(fb)344 fbTyp = arrowserde.TypeInterval345 case typeconv.DatumVecCanonicalTypeFamily:346 // Datums are marshaled into bytes, so we use binary headers.347 arrowserde.BinaryStart(fb)348 fbTypOffset = arrowserde.BinaryEnd(fb)349 fbTyp = arrowserde.TypeUtf8350 default:351 panic(errors.Errorf(`don't know how to map %s`, typ))352 }353 arrowserde.FieldStart(fb)354 arrowserde.FieldAddTypeType(fb, fbTyp)355 arrowserde.FieldAddType(fb, fbTypOffset)356 fieldOffsets[idx] = arrowserde.FieldEnd(fb)357 }358 arrowserde.SchemaStartFieldsVector(fb, len(typs))359 // flatbuffers adds everything back to front. Reverse iterate so they're in360 // the right order when they come out.361 for i := len(fieldOffsets) - 1; i >= 0; i-- {362 fb.PrependUOffsetT(fieldOffsets[i])363 }364 fields := fb.EndVector(len(typs))365 arrowserde.SchemaStart(fb)366 arrowserde.SchemaAddFields(fb, fields)367 return arrowserde.SchemaEnd(fb)368}369func schemaMessage(fb *flatbuffers.Builder, typs []*types.T) flatbuffers.UOffsetT {370 schemaOffset := schema(fb, typs)371 arrowserde.MessageStart(fb)372 arrowserde.MessageAddVersion(fb, arrowserde.MetadataVersionV1)373 arrowserde.MessageAddHeaderType(fb, arrowserde.MessageHeaderSchema)374 arrowserde.MessageAddHeader(fb, schemaOffset)375 return arrowserde.MessageEnd(fb)376}377func fileFooter(378 fb *flatbuffers.Builder, typs []*types.T, recordBatches []fileBlock,379) flatbuffers.UOffsetT {380 schemaOffset := schema(fb, typs)381 arrowserde.FooterStartRecordBatchesVector(fb, len(recordBatches))382 // flatbuffers adds everything back to front. Reverse iterate so they're in383 // the right order when they come out.384 for i := len(recordBatches) - 1; i >= 0; i-- {385 rb := recordBatches[i]386 arrowserde.CreateBlock(fb, rb.offset, rb.metadataLen, rb.bodyLen)387 }388 recordBatchesOffset := fb.EndVector(len(recordBatches))389 arrowserde.FooterStart(fb)390 arrowserde.FooterAddVersion(fb, arrowserde.MetadataVersionV1)391 arrowserde.FooterAddSchema(fb, schemaOffset)392 arrowserde.FooterAddRecordBatches(fb, recordBatchesOffset)393 return arrowserde.FooterEnd(fb)394}...

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serializer.go

Source:serializer.go Github

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2import (3 "errors"4 "reflect"5)6type eventFunc = func() interface{}7type marshal func(v interface{}) ([]byte, error)8type unmarshal func(data []byte, v interface{}) error9// Serializer for json serializes10type Serializer struct {11 eventRegister map[string]eventFunc12 marshal marshal13 unmarshal unmarshal14}15// NewSerializer returns a json Handle16func NewSerializer(marshalF marshal, unmarshalF unmarshal) *Serializer {17 return &Serializer{18 eventRegister: make(map[string]eventFunc),19 marshal: marshalF,20 unmarshal: unmarshalF,21 }22}23var (24 // ErrAggregateNameMissing return if aggregate name is missing25 ErrAggregateNameMissing = errors.New("missing aggregate name")26 // ErrNoEventsToRegister return if no events to register27 ErrNoEventsToRegister = errors.New("no events to register")28 // ErrEventNameMissing return if Event name is missing29 ErrEventNameMissing = errors.New("missing event name")30)31// RegisterTypes events aggregate32func (h *Serializer) RegisterTypes(aggregate Aggregate, events ...eventFunc) error {33 typ := reflect.TypeOf(aggregate).Elem().Name()34 if typ == "" {35 return ErrAggregateNameMissing36 }37 if len(events) == 0 {38 return ErrNoEventsToRegister39 }40 for _, f := range events {41 event := f()42 reason := reflect.TypeOf(event).Elem().Name()43 if reason == "" {44 return ErrEventNameMissing45 }46 h.eventRegister[typ+"_"+reason] = f47 }48 return nil49}50// Type return a struct from the registry51func (h *Serializer) Type(typ, reason string) (eventFunc, bool) {52 d, ok := h.eventRegister[typ+"_"+reason]53 return d, ok54}55// Marshal pass the request to the under laying Marshal method56func (h *Serializer) Marshal(v interface{}) ([]byte, error) {57 return h.marshal(v)58}59// Unmarshal pass the request to the under laying Unmarshal method60func (h *Serializer) Unmarshal(data []byte, v interface{}) error {61 return h.unmarshal(data, v)62}...

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typ

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1import "fmt"2type serializer interface {3 typ() string4}5type foo struct{}6func (f *foo) typ() string {7}8type bar struct{}9func (b *bar) typ() string {10}11func main() {12 s = &foo{}13 fmt.Println(s.typ())14 s = &bar{}15 fmt.Println(s.typ())16}

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typ

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1func (s serializer) typ() string {2}3func (s serializer) typ() string {4}5func (s serializer) typ() string {6}7func (s serializer) typ() string {8}9func (s serializer) typ() string {10}11func (s serializer) typ() string {12}13func (s serializer) typ() string {14}15func (s serializer) typ() string {16}17func (s serializer) typ() string {18}19func (s serializer) typ() string {20}21func (s serializer) typ() string {22}23func (s serializer) typ() string {24}25func (s serializer) typ() string {26}27func (s serializer) typ() string {28}29func (s serializer) typ() string {30}31func (s serializer) typ() string {32}33func (

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typ

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1s.serialize()2s.serialize()3s.serialize()4s.serialize()5s.serialize()6s.serialize()7s.serialize()8s.serialize()9s.serialize()10s.serialize()11s.serialize()12s.serialize()13s.serialize()14s.serialize()15s.serialize()16s.serialize()17s.serialize()18s.serialize()19s.serialize()20s.serialize()21s.serialize()22s.serialize()23s.serialize()24s.serialize()25s.serialize()26s.serialize()

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typ

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1func main() {2 s = serializer{typ: "json"}3 s.serialize()4}5func main() {6 s = serializer{typ: "xml"}7 s.serialize()8}9func main() {10 s = serializer{typ: "yaml"}11 s.serialize()12}13func main() {14 s = serializer{typ: "toml"}15 s.serialize()16}17func main() {18 s = serializer{typ: "csv"}19 s.serialize()20}21func main() {22 s = serializer{typ: "xml"}23 s.serialize()24}25func main() {26 s = serializer{typ: "yaml"}27 s.serialize()28}29func main() {30 s = serializer{typ: "toml"}31 s.serialize()32}33func main() {34 s = serializer{typ: "csv"}35 s.serialize()36}37func main() {38 s = serializer{typ: "xml"}39 s.serialize()40}41func main() {42 s = serializer{typ: "yaml"}43 s.serialize()44}45func main() {46 s = serializer{typ: "toml"}47 s.serialize()48}49func main()

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typ

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1serializer = new serializer();2serializer.typ(2);3serializer.typ(3);4serializer.typ(4);5serializer.typ(5);6serializer = new serializer();7serializer.typ(2);8serializer.typ(3);9serializer.typ(4);10serializer.typ(5);11type Serializer interface {12 typ(int)13}14func New() Serializer {15 return &serializer{}16}17type serializer struct {18}19func (s *serializer) typ(i int) {20}21import (22func main() {23 s := serializer.New()24 s.typ(2)25 s.typ(3)26 s.typ(4)27 s.typ(5)28}29import (30func main() {31 s := serializer.New()32 s.typ(2)33 s.typ(3)34 s.typ(4)35 s.typ(5)36}

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typ

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1import (2type serializer struct {3}4func (s *serializer) serialize() {5 fmt.Println("serializing...")6}7func (s *serializer) deserialize() {8 fmt.Println("deserializing...")9}10func main() {11 s := serializer{typ: "json"}12 s.serialize()13 s.deserialize()14}15import (16type serializer struct {17}18func (s *serializer) serialize() {19 fmt.Println("serializing...")20}21func (s *serializer) deserialize() {22 fmt.Println("deserializing...")23}24type jsonSerializer struct {25}26func main() {27 s := jsonSerializer{}28 s.serialize()29 s.deserialize()30}31import (32type serializer struct {33}34func (s *serializer) serialize() {35 fmt.Println("serializing...")36}37func (s *serializer) deserialize() {38 fmt.Println("deserializing...")39}40type jsonSerializer struct {41}42func (j *jsonSerializer) serialize() {43 fmt.Println("serializing json...")44}45func main() {46 s := jsonSerializer{}47 s.serialize()48 s.deserialize()49}

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typ

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1import "fmt"2func main() {3 s := serializer{typ: "json"}4 s.dump()5}6import "fmt"7type serializer struct {8}9func (s *serializer) dump() {10 fmt.Println(s.typ)11}12func main() {13 s := serializer{typ: "json"}14 s.dump()15}16import "fmt"17type serializer struct {18}19func (s *serializer) dump() {20 fmt.Println(s.typ)21}22func main() {23 s := serializer{typ: "json"}24 s.dump()25}26import "fmt"27type serializer struct {28}29func (s *serializer) dump() {30 fmt.Println(s.typ)31}32func main() {33 s := serializer{typ: "json"}34 s.dump()35}36import "fmt"37type serializer struct {38}39func (s *serializer) dump() {40 fmt.Println(s.typ)41}42func main() {43 s := serializer{typ: "json"}44 s.dump()45}46import "fmt"47type serializer struct {48}49func (s *serializer) dump() {50 fmt.Println(s.typ)51}52func main() {53 s := serializer{typ: "json"}54 s.dump()55}56import "fmt"57type serializer struct {58}59func (s *serializer) dump() {60 fmt.Println(s.typ)61}62func main() {63 s := serializer{typ: "json"}64 s.dump()65}66import "fmt"

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1import (2type serializer struct {3}4func (s serializer) typ() string {5}6func main() {7 s := serializer{}8 t := reflect.TypeOf(s)9 fmt.Println(t)10 fmt.Println(t.MethodByName("typ"))11 fmt.Println(t.MethodByName("typ").Func)12 fmt.Println(t.MethodByName("typ").Func.Call([]reflect.Value{reflect.ValueOf(s)}))13 fmt.Println(t.MethodByName("typ").Func.Call([]reflect.Value{reflect.ValueOf(s)})[0].String())14 fmt.Println(t.MethodByName("typ").Func.Call([]reflect.Value{reflect.ValueOf(s)})[0].String() == "s")15}16{typ 0x5c2c0 0 [0] false}

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