aboutsummaryrefslogtreecommitdiffstats
path: root/gcc-4.8.1/libgo/go/encoding/gob/type.go
diff options
context:
space:
mode:
authorDan Albert <danalbert@google.com>2016-02-24 13:48:45 -0800
committerDan Albert <danalbert@google.com>2016-02-24 13:51:18 -0800
commitb9de1157289455b0ca26daff519d4a0ddcd1fa13 (patch)
tree4c56cc0a34b91f17033a40a455f26652304f7b8d /gcc-4.8.1/libgo/go/encoding/gob/type.go
parent098157a754787181cfa10e71325832448ddcea98 (diff)
downloadtoolchain_gcc-b9de1157289455b0ca26daff519d4a0ddcd1fa13.tar.gz
toolchain_gcc-b9de1157289455b0ca26daff519d4a0ddcd1fa13.tar.bz2
toolchain_gcc-b9de1157289455b0ca26daff519d4a0ddcd1fa13.zip
Update 4.8.1 to 4.8.3.
My previous drop was the wrong version. The platform mingw is currently using 4.8.3, not 4.8.1 (not sure how I got that wrong). From ftp://ftp.gnu.org/gnu/gcc/gcc-4.8.3/gcc-4.8.3.tar.bz2. Bug: http://b/26523949 Change-Id: Id85f1bdcbbaf78c7d0b5a69e74c798a08f341c35
Diffstat (limited to 'gcc-4.8.1/libgo/go/encoding/gob/type.go')
-rw-r--r--gcc-4.8.1/libgo/go/encoding/gob/type.go827
1 files changed, 0 insertions, 827 deletions
diff --git a/gcc-4.8.1/libgo/go/encoding/gob/type.go b/gcc-4.8.1/libgo/go/encoding/gob/type.go
deleted file mode 100644
index ea0db4eac..000000000
--- a/gcc-4.8.1/libgo/go/encoding/gob/type.go
+++ /dev/null
@@ -1,827 +0,0 @@
-// Copyright 2009 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package gob
-
-import (
- "errors"
- "fmt"
- "os"
- "reflect"
- "sync"
- "unicode"
- "unicode/utf8"
-)
-
-// userTypeInfo stores the information associated with a type the user has handed
-// to the package. It's computed once and stored in a map keyed by reflection
-// type.
-type userTypeInfo struct {
- user reflect.Type // the type the user handed us
- base reflect.Type // the base type after all indirections
- indir int // number of indirections to reach the base type
- isGobEncoder bool // does the type implement GobEncoder?
- isGobDecoder bool // does the type implement GobDecoder?
- encIndir int8 // number of indirections to reach the receiver type; may be negative
- decIndir int8 // number of indirections to reach the receiver type; may be negative
-}
-
-var (
- // Protected by an RWMutex because we read it a lot and write
- // it only when we see a new type, typically when compiling.
- userTypeLock sync.RWMutex
- userTypeCache = make(map[reflect.Type]*userTypeInfo)
-)
-
-// validType returns, and saves, the information associated with user-provided type rt.
-// If the user type is not valid, err will be non-nil. To be used when the error handler
-// is not set up.
-func validUserType(rt reflect.Type) (ut *userTypeInfo, err error) {
- userTypeLock.RLock()
- ut = userTypeCache[rt]
- userTypeLock.RUnlock()
- if ut != nil {
- return
- }
- // Now set the value under the write lock.
- userTypeLock.Lock()
- defer userTypeLock.Unlock()
- if ut = userTypeCache[rt]; ut != nil {
- // Lost the race; not a problem.
- return
- }
- ut = new(userTypeInfo)
- ut.base = rt
- ut.user = rt
- // A type that is just a cycle of pointers (such as type T *T) cannot
- // be represented in gobs, which need some concrete data. We use a
- // cycle detection algorithm from Knuth, Vol 2, Section 3.1, Ex 6,
- // pp 539-540. As we step through indirections, run another type at
- // half speed. If they meet up, there's a cycle.
- slowpoke := ut.base // walks half as fast as ut.base
- for {
- pt := ut.base
- if pt.Kind() != reflect.Ptr {
- break
- }
- ut.base = pt.Elem()
- if ut.base == slowpoke { // ut.base lapped slowpoke
- // recursive pointer type.
- return nil, errors.New("can't represent recursive pointer type " + ut.base.String())
- }
- if ut.indir%2 == 0 {
- slowpoke = slowpoke.Elem()
- }
- ut.indir++
- }
- ut.isGobEncoder, ut.encIndir = implementsInterface(ut.user, gobEncoderInterfaceType)
- ut.isGobDecoder, ut.decIndir = implementsInterface(ut.user, gobDecoderInterfaceType)
- userTypeCache[rt] = ut
- return
-}
-
-var (
- gobEncoderInterfaceType = reflect.TypeOf((*GobEncoder)(nil)).Elem()
- gobDecoderInterfaceType = reflect.TypeOf((*GobDecoder)(nil)).Elem()
-)
-
-// implementsInterface reports whether the type implements the
-// gobEncoder/gobDecoder interface.
-// It also returns the number of indirections required to get to the
-// implementation.
-func implementsInterface(typ, gobEncDecType reflect.Type) (success bool, indir int8) {
- if typ == nil {
- return
- }
- rt := typ
- // The type might be a pointer and we need to keep
- // dereferencing to the base type until we find an implementation.
- for {
- if rt.Implements(gobEncDecType) {
- return true, indir
- }
- if p := rt; p.Kind() == reflect.Ptr {
- indir++
- if indir > 100 { // insane number of indirections
- return false, 0
- }
- rt = p.Elem()
- continue
- }
- break
- }
- // No luck yet, but if this is a base type (non-pointer), the pointer might satisfy.
- if typ.Kind() != reflect.Ptr {
- // Not a pointer, but does the pointer work?
- if reflect.PtrTo(typ).Implements(gobEncDecType) {
- return true, -1
- }
- }
- return false, 0
-}
-
-// userType returns, and saves, the information associated with user-provided type rt.
-// If the user type is not valid, it calls error.
-func userType(rt reflect.Type) *userTypeInfo {
- ut, err := validUserType(rt)
- if err != nil {
- error_(err)
- }
- return ut
-}
-
-// A typeId represents a gob Type as an integer that can be passed on the wire.
-// Internally, typeIds are used as keys to a map to recover the underlying type info.
-type typeId int32
-
-var nextId typeId // incremented for each new type we build
-var typeLock sync.Mutex // set while building a type
-const firstUserId = 64 // lowest id number granted to user
-
-type gobType interface {
- id() typeId
- setId(id typeId)
- name() string
- string() string // not public; only for debugging
- safeString(seen map[typeId]bool) string
-}
-
-var types = make(map[reflect.Type]gobType)
-var idToType = make(map[typeId]gobType)
-var builtinIdToType map[typeId]gobType // set in init() after builtins are established
-
-func setTypeId(typ gobType) {
- // When building recursive types, someone may get there before us.
- if typ.id() != 0 {
- return
- }
- nextId++
- typ.setId(nextId)
- idToType[nextId] = typ
-}
-
-func (t typeId) gobType() gobType {
- if t == 0 {
- return nil
- }
- return idToType[t]
-}
-
-// string returns the string representation of the type associated with the typeId.
-func (t typeId) string() string {
- if t.gobType() == nil {
- return "<nil>"
- }
- return t.gobType().string()
-}
-
-// Name returns the name of the type associated with the typeId.
-func (t typeId) name() string {
- if t.gobType() == nil {
- return "<nil>"
- }
- return t.gobType().name()
-}
-
-// CommonType holds elements of all types.
-// It is a historical artifact, kept for binary compatibility and exported
-// only for the benefit of the package's encoding of type descriptors. It is
-// not intended for direct use by clients.
-type CommonType struct {
- Name string
- Id typeId
-}
-
-func (t *CommonType) id() typeId { return t.Id }
-
-func (t *CommonType) setId(id typeId) { t.Id = id }
-
-func (t *CommonType) string() string { return t.Name }
-
-func (t *CommonType) safeString(seen map[typeId]bool) string {
- return t.Name
-}
-
-func (t *CommonType) name() string { return t.Name }
-
-// Create and check predefined types
-// The string for tBytes is "bytes" not "[]byte" to signify its specialness.
-
-var (
- // Primordial types, needed during initialization.
- // Always passed as pointers so the interface{} type
- // goes through without losing its interfaceness.
- tBool = bootstrapType("bool", (*bool)(nil), 1)
- tInt = bootstrapType("int", (*int)(nil), 2)
- tUint = bootstrapType("uint", (*uint)(nil), 3)
- tFloat = bootstrapType("float", (*float64)(nil), 4)
- tBytes = bootstrapType("bytes", (*[]byte)(nil), 5)
- tString = bootstrapType("string", (*string)(nil), 6)
- tComplex = bootstrapType("complex", (*complex128)(nil), 7)
- tInterface = bootstrapType("interface", (*interface{})(nil), 8)
- // Reserve some Ids for compatible expansion
- tReserved7 = bootstrapType("_reserved1", (*struct{ r7 int })(nil), 9)
- tReserved6 = bootstrapType("_reserved1", (*struct{ r6 int })(nil), 10)
- tReserved5 = bootstrapType("_reserved1", (*struct{ r5 int })(nil), 11)
- tReserved4 = bootstrapType("_reserved1", (*struct{ r4 int })(nil), 12)
- tReserved3 = bootstrapType("_reserved1", (*struct{ r3 int })(nil), 13)
- tReserved2 = bootstrapType("_reserved1", (*struct{ r2 int })(nil), 14)
- tReserved1 = bootstrapType("_reserved1", (*struct{ r1 int })(nil), 15)
-)
-
-// Predefined because it's needed by the Decoder
-var tWireType = mustGetTypeInfo(reflect.TypeOf(wireType{})).id
-var wireTypeUserInfo *userTypeInfo // userTypeInfo of (*wireType)
-
-func init() {
- // Some magic numbers to make sure there are no surprises.
- checkId(16, tWireType)
- checkId(17, mustGetTypeInfo(reflect.TypeOf(arrayType{})).id)
- checkId(18, mustGetTypeInfo(reflect.TypeOf(CommonType{})).id)
- checkId(19, mustGetTypeInfo(reflect.TypeOf(sliceType{})).id)
- checkId(20, mustGetTypeInfo(reflect.TypeOf(structType{})).id)
- checkId(21, mustGetTypeInfo(reflect.TypeOf(fieldType{})).id)
- checkId(23, mustGetTypeInfo(reflect.TypeOf(mapType{})).id)
-
- builtinIdToType = make(map[typeId]gobType)
- for k, v := range idToType {
- builtinIdToType[k] = v
- }
-
- // Move the id space upwards to allow for growth in the predefined world
- // without breaking existing files.
- if nextId > firstUserId {
- panic(fmt.Sprintln("nextId too large:", nextId))
- }
- nextId = firstUserId
- registerBasics()
- wireTypeUserInfo = userType(reflect.TypeOf((*wireType)(nil)))
-}
-
-// Array type
-type arrayType struct {
- CommonType
- Elem typeId
- Len int
-}
-
-func newArrayType(name string) *arrayType {
- a := &arrayType{CommonType{Name: name}, 0, 0}
- return a
-}
-
-func (a *arrayType) init(elem gobType, len int) {
- // Set our type id before evaluating the element's, in case it's our own.
- setTypeId(a)
- a.Elem = elem.id()
- a.Len = len
-}
-
-func (a *arrayType) safeString(seen map[typeId]bool) string {
- if seen[a.Id] {
- return a.Name
- }
- seen[a.Id] = true
- return fmt.Sprintf("[%d]%s", a.Len, a.Elem.gobType().safeString(seen))
-}
-
-func (a *arrayType) string() string { return a.safeString(make(map[typeId]bool)) }
-
-// GobEncoder type (something that implements the GobEncoder interface)
-type gobEncoderType struct {
- CommonType
-}
-
-func newGobEncoderType(name string) *gobEncoderType {
- g := &gobEncoderType{CommonType{Name: name}}
- setTypeId(g)
- return g
-}
-
-func (g *gobEncoderType) safeString(seen map[typeId]bool) string {
- return g.Name
-}
-
-func (g *gobEncoderType) string() string { return g.Name }
-
-// Map type
-type mapType struct {
- CommonType
- Key typeId
- Elem typeId
-}
-
-func newMapType(name string) *mapType {
- m := &mapType{CommonType{Name: name}, 0, 0}
- return m
-}
-
-func (m *mapType) init(key, elem gobType) {
- // Set our type id before evaluating the element's, in case it's our own.
- setTypeId(m)
- m.Key = key.id()
- m.Elem = elem.id()
-}
-
-func (m *mapType) safeString(seen map[typeId]bool) string {
- if seen[m.Id] {
- return m.Name
- }
- seen[m.Id] = true
- key := m.Key.gobType().safeString(seen)
- elem := m.Elem.gobType().safeString(seen)
- return fmt.Sprintf("map[%s]%s", key, elem)
-}
-
-func (m *mapType) string() string { return m.safeString(make(map[typeId]bool)) }
-
-// Slice type
-type sliceType struct {
- CommonType
- Elem typeId
-}
-
-func newSliceType(name string) *sliceType {
- s := &sliceType{CommonType{Name: name}, 0}
- return s
-}
-
-func (s *sliceType) init(elem gobType) {
- // Set our type id before evaluating the element's, in case it's our own.
- setTypeId(s)
- // See the comments about ids in newTypeObject. Only slices and
- // structs have mutual recursion.
- if elem.id() == 0 {
- setTypeId(elem)
- }
- s.Elem = elem.id()
-}
-
-func (s *sliceType) safeString(seen map[typeId]bool) string {
- if seen[s.Id] {
- return s.Name
- }
- seen[s.Id] = true
- return fmt.Sprintf("[]%s", s.Elem.gobType().safeString(seen))
-}
-
-func (s *sliceType) string() string { return s.safeString(make(map[typeId]bool)) }
-
-// Struct type
-type fieldType struct {
- Name string
- Id typeId
-}
-
-type structType struct {
- CommonType
- Field []*fieldType
-}
-
-func (s *structType) safeString(seen map[typeId]bool) string {
- if s == nil {
- return "<nil>"
- }
- if _, ok := seen[s.Id]; ok {
- return s.Name
- }
- seen[s.Id] = true
- str := s.Name + " = struct { "
- for _, f := range s.Field {
- str += fmt.Sprintf("%s %s; ", f.Name, f.Id.gobType().safeString(seen))
- }
- str += "}"
- return str
-}
-
-func (s *structType) string() string { return s.safeString(make(map[typeId]bool)) }
-
-func newStructType(name string) *structType {
- s := &structType{CommonType{Name: name}, nil}
- // For historical reasons we set the id here rather than init.
- // See the comment in newTypeObject for details.
- setTypeId(s)
- return s
-}
-
-// newTypeObject allocates a gobType for the reflection type rt.
-// Unless ut represents a GobEncoder, rt should be the base type
-// of ut.
-// This is only called from the encoding side. The decoding side
-// works through typeIds and userTypeInfos alone.
-func newTypeObject(name string, ut *userTypeInfo, rt reflect.Type) (gobType, error) {
- // Does this type implement GobEncoder?
- if ut.isGobEncoder {
- return newGobEncoderType(name), nil
- }
- var err error
- var type0, type1 gobType
- defer func() {
- if err != nil {
- delete(types, rt)
- }
- }()
- // Install the top-level type before the subtypes (e.g. struct before
- // fields) so recursive types can be constructed safely.
- switch t := rt; t.Kind() {
- // All basic types are easy: they are predefined.
- case reflect.Bool:
- return tBool.gobType(), nil
-
- case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
- return tInt.gobType(), nil
-
- case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
- return tUint.gobType(), nil
-
- case reflect.Float32, reflect.Float64:
- return tFloat.gobType(), nil
-
- case reflect.Complex64, reflect.Complex128:
- return tComplex.gobType(), nil
-
- case reflect.String:
- return tString.gobType(), nil
-
- case reflect.Interface:
- return tInterface.gobType(), nil
-
- case reflect.Array:
- at := newArrayType(name)
- types[rt] = at
- type0, err = getBaseType("", t.Elem())
- if err != nil {
- return nil, err
- }
- // Historical aside:
- // For arrays, maps, and slices, we set the type id after the elements
- // are constructed. This is to retain the order of type id allocation after
- // a fix made to handle recursive types, which changed the order in
- // which types are built. Delaying the setting in this way preserves
- // type ids while allowing recursive types to be described. Structs,
- // done below, were already handling recursion correctly so they
- // assign the top-level id before those of the field.
- at.init(type0, t.Len())
- return at, nil
-
- case reflect.Map:
- mt := newMapType(name)
- types[rt] = mt
- type0, err = getBaseType("", t.Key())
- if err != nil {
- return nil, err
- }
- type1, err = getBaseType("", t.Elem())
- if err != nil {
- return nil, err
- }
- mt.init(type0, type1)
- return mt, nil
-
- case reflect.Slice:
- // []byte == []uint8 is a special case
- if t.Elem().Kind() == reflect.Uint8 {
- return tBytes.gobType(), nil
- }
- st := newSliceType(name)
- types[rt] = st
- type0, err = getBaseType(t.Elem().Name(), t.Elem())
- if err != nil {
- return nil, err
- }
- st.init(type0)
- return st, nil
-
- case reflect.Struct:
- st := newStructType(name)
- types[rt] = st
- idToType[st.id()] = st
- for i := 0; i < t.NumField(); i++ {
- f := t.Field(i)
- if !isExported(f.Name) {
- continue
- }
- typ := userType(f.Type).base
- tname := typ.Name()
- if tname == "" {
- t := userType(f.Type).base
- tname = t.String()
- }
- gt, err := getBaseType(tname, f.Type)
- if err != nil {
- return nil, err
- }
- // Some mutually recursive types can cause us to be here while
- // still defining the element. Fix the element type id here.
- // We could do this more neatly by setting the id at the start of
- // building every type, but that would break binary compatibility.
- if gt.id() == 0 {
- setTypeId(gt)
- }
- st.Field = append(st.Field, &fieldType{f.Name, gt.id()})
- }
- return st, nil
-
- default:
- return nil, errors.New("gob NewTypeObject can't handle type: " + rt.String())
- }
- return nil, nil
-}
-
-// isExported reports whether this is an exported - upper case - name.
-func isExported(name string) bool {
- rune, _ := utf8.DecodeRuneInString(name)
- return unicode.IsUpper(rune)
-}
-
-// getBaseType returns the Gob type describing the given reflect.Type's base type.
-// typeLock must be held.
-func getBaseType(name string, rt reflect.Type) (gobType, error) {
- ut := userType(rt)
- return getType(name, ut, ut.base)
-}
-
-// getType returns the Gob type describing the given reflect.Type.
-// Should be called only when handling GobEncoders/Decoders,
-// which may be pointers. All other types are handled through the
-// base type, never a pointer.
-// typeLock must be held.
-func getType(name string, ut *userTypeInfo, rt reflect.Type) (gobType, error) {
- typ, present := types[rt]
- if present {
- return typ, nil
- }
- typ, err := newTypeObject(name, ut, rt)
- if err == nil {
- types[rt] = typ
- }
- return typ, err
-}
-
-func checkId(want, got typeId) {
- if want != got {
- fmt.Fprintf(os.Stderr, "checkId: %d should be %d\n", int(got), int(want))
- panic("bootstrap type wrong id: " + got.name() + " " + got.string() + " not " + want.string())
- }
-}
-
-// used for building the basic types; called only from init(). the incoming
-// interface always refers to a pointer.
-func bootstrapType(name string, e interface{}, expect typeId) typeId {
- rt := reflect.TypeOf(e).Elem()
- _, present := types[rt]
- if present {
- panic("bootstrap type already present: " + name + ", " + rt.String())
- }
- typ := &CommonType{Name: name}
- types[rt] = typ
- setTypeId(typ)
- checkId(expect, nextId)
- userType(rt) // might as well cache it now
- return nextId
-}
-
-// Representation of the information we send and receive about this type.
-// Each value we send is preceded by its type definition: an encoded int.
-// However, the very first time we send the value, we first send the pair
-// (-id, wireType).
-// For bootstrapping purposes, we assume that the recipient knows how
-// to decode a wireType; it is exactly the wireType struct here, interpreted
-// using the gob rules for sending a structure, except that we assume the
-// ids for wireType and structType etc. are known. The relevant pieces
-// are built in encode.go's init() function.
-// To maintain binary compatibility, if you extend this type, always put
-// the new fields last.
-type wireType struct {
- ArrayT *arrayType
- SliceT *sliceType
- StructT *structType
- MapT *mapType
- GobEncoderT *gobEncoderType
-}
-
-func (w *wireType) string() string {
- const unknown = "unknown type"
- if w == nil {
- return unknown
- }
- switch {
- case w.ArrayT != nil:
- return w.ArrayT.Name
- case w.SliceT != nil:
- return w.SliceT.Name
- case w.StructT != nil:
- return w.StructT.Name
- case w.MapT != nil:
- return w.MapT.Name
- case w.GobEncoderT != nil:
- return w.GobEncoderT.Name
- }
- return unknown
-}
-
-type typeInfo struct {
- id typeId
- encoder *encEngine
- wire *wireType
-}
-
-var typeInfoMap = make(map[reflect.Type]*typeInfo) // protected by typeLock
-
-// typeLock must be held.
-func getTypeInfo(ut *userTypeInfo) (*typeInfo, error) {
- rt := ut.base
- if ut.isGobEncoder {
- // We want the user type, not the base type.
- rt = ut.user
- }
- info, ok := typeInfoMap[rt]
- if ok {
- return info, nil
- }
- info = new(typeInfo)
- gt, err := getBaseType(rt.Name(), rt)
- if err != nil {
- return nil, err
- }
- info.id = gt.id()
-
- if ut.isGobEncoder {
- userType, err := getType(rt.Name(), ut, rt)
- if err != nil {
- return nil, err
- }
- info.wire = &wireType{GobEncoderT: userType.id().gobType().(*gobEncoderType)}
- typeInfoMap[ut.user] = info
- return info, nil
- }
-
- t := info.id.gobType()
- switch typ := rt; typ.Kind() {
- case reflect.Array:
- info.wire = &wireType{ArrayT: t.(*arrayType)}
- case reflect.Map:
- info.wire = &wireType{MapT: t.(*mapType)}
- case reflect.Slice:
- // []byte == []uint8 is a special case handled separately
- if typ.Elem().Kind() != reflect.Uint8 {
- info.wire = &wireType{SliceT: t.(*sliceType)}
- }
- case reflect.Struct:
- info.wire = &wireType{StructT: t.(*structType)}
- }
- typeInfoMap[rt] = info
- return info, nil
-}
-
-// Called only when a panic is acceptable and unexpected.
-func mustGetTypeInfo(rt reflect.Type) *typeInfo {
- t, err := getTypeInfo(userType(rt))
- if err != nil {
- panic("getTypeInfo: " + err.Error())
- }
- return t
-}
-
-// GobEncoder is the interface describing data that provides its own
-// representation for encoding values for transmission to a GobDecoder.
-// A type that implements GobEncoder and GobDecoder has complete
-// control over the representation of its data and may therefore
-// contain things such as private fields, channels, and functions,
-// which are not usually transmissible in gob streams.
-//
-// Note: Since gobs can be stored permanently, It is good design
-// to guarantee the encoding used by a GobEncoder is stable as the
-// software evolves. For instance, it might make sense for GobEncode
-// to include a version number in the encoding.
-type GobEncoder interface {
- // GobEncode returns a byte slice representing the encoding of the
- // receiver for transmission to a GobDecoder, usually of the same
- // concrete type.
- GobEncode() ([]byte, error)
-}
-
-// GobDecoder is the interface describing data that provides its own
-// routine for decoding transmitted values sent by a GobEncoder.
-type GobDecoder interface {
- // GobDecode overwrites the receiver, which must be a pointer,
- // with the value represented by the byte slice, which was written
- // by GobEncode, usually for the same concrete type.
- GobDecode([]byte) error
-}
-
-var (
- registerLock sync.RWMutex
- nameToConcreteType = make(map[string]reflect.Type)
- concreteTypeToName = make(map[reflect.Type]string)
-)
-
-// RegisterName is like Register but uses the provided name rather than the
-// type's default.
-func RegisterName(name string, value interface{}) {
- if name == "" {
- // reserved for nil
- panic("attempt to register empty name")
- }
- registerLock.Lock()
- defer registerLock.Unlock()
- ut := userType(reflect.TypeOf(value))
- // Check for incompatible duplicates. The name must refer to the
- // same user type, and vice versa.
- if t, ok := nameToConcreteType[name]; ok && t != ut.user {
- panic(fmt.Sprintf("gob: registering duplicate types for %q: %s != %s", name, t, ut.user))
- }
- if n, ok := concreteTypeToName[ut.base]; ok && n != name {
- panic(fmt.Sprintf("gob: registering duplicate names for %s: %q != %q", ut.user, n, name))
- }
- // Store the name and type provided by the user....
- nameToConcreteType[name] = reflect.TypeOf(value)
- // but the flattened type in the type table, since that's what decode needs.
- concreteTypeToName[ut.base] = name
-}
-
-// Register records a type, identified by a value for that type, under its
-// internal type name. That name will identify the concrete type of a value
-// sent or received as an interface variable. Only types that will be
-// transferred as implementations of interface values need to be registered.
-// Expecting to be used only during initialization, it panics if the mapping
-// between types and names is not a bijection.
-func Register(value interface{}) {
- // Default to printed representation for unnamed types
- rt := reflect.TypeOf(value)
- name := rt.String()
-
- // But for named types (or pointers to them), qualify with import path (but see inner comment).
- // Dereference one pointer looking for a named type.
- star := ""
- if rt.Name() == "" {
- if pt := rt; pt.Kind() == reflect.Ptr {
- star = "*"
- // NOTE: The following line should be rt = pt.Elem() to implement
- // what the comment above claims, but fixing it would break compatibility
- // with existing gobs.
- //
- // Given package p imported as "full/p" with these definitions:
- // package p
- // type T1 struct { ... }
- // this table shows the intended and actual strings used by gob to
- // name the types:
- //
- // Type Correct string Actual string
- //
- // T1 full/p.T1 full/p.T1
- // *T1 *full/p.T1 *p.T1
- //
- // The missing full path cannot be fixed without breaking existing gob decoders.
- rt = pt
- }
- }
- if rt.Name() != "" {
- if rt.PkgPath() == "" {
- name = star + rt.Name()
- } else {
- name = star + rt.PkgPath() + "." + rt.Name()
- }
- }
-
- RegisterName(name, value)
-}
-
-func registerBasics() {
- Register(int(0))
- Register(int8(0))
- Register(int16(0))
- Register(int32(0))
- Register(int64(0))
- Register(uint(0))
- Register(uint8(0))
- Register(uint16(0))
- Register(uint32(0))
- Register(uint64(0))
- Register(float32(0))
- Register(float64(0))
- Register(complex64(0i))
- Register(complex128(0i))
- Register(uintptr(0))
- Register(false)
- Register("")
- Register([]byte(nil))
- Register([]int(nil))
- Register([]int8(nil))
- Register([]int16(nil))
- Register([]int32(nil))
- Register([]int64(nil))
- Register([]uint(nil))
- Register([]uint8(nil))
- Register([]uint16(nil))
- Register([]uint32(nil))
- Register([]uint64(nil))
- Register([]float32(nil))
- Register([]float64(nil))
- Register([]complex64(nil))
- Register([]complex128(nil))
- Register([]uintptr(nil))
- Register([]bool(nil))
- Register([]string(nil))
-}