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// 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 reflect implements run-time reflection, allowing a program to
// manipulate objects with arbitrary types. The typical use is to take a value
// with static type interface{} and extract its dynamic type information by
// calling TypeOf, which returns a Type.
//
// A call to ValueOf returns a Value representing the run-time data.
// Zero takes a Type and returns a Value representing a zero value
// for that type.
//
// See "The Laws of Reflection" for an introduction to reflection in Go:
// https://golang.org/doc/articles/laws_of_reflection.html
package reflect
import (
"runtime"
"strconv"
"sync"
"unicode"
"unicode/utf8"
"unsafe"
)
// Type is the representation of a Go type.
//
// Not all methods apply to all kinds of types. Restrictions,
// if any, are noted in the documentation for each method.
// Use the Kind method to find out the kind of type before
// calling kind-specific methods. Calling a method
// inappropriate to the kind of type causes a run-time panic.
//
// Type values are comparable, such as with the == operator.
// Two Type values are equal if they represent identical types.
type Type interface {
// Methods applicable to all types.
// Align returns the alignment in bytes of a value of
// this type when allocated in memory.
Align() int
// FieldAlign returns the alignment in bytes of a value of
// this type when used as a field in a struct.
FieldAlign() int
// Method returns the i'th method in the type's method set.
// It panics if i is not in the range [0, NumMethod()).
//
// For a non-interface type T or *T, the returned Method's Type and Func
// fields describe a function whose first argument is the receiver.
//
// For an interface type, the returned Method's Type field gives the
// method signature, without a receiver, and the Func field is nil.
Method(int) Method
// MethodByName returns the method with that name in the type's
// method set and a boolean indicating if the method was found.
//
// For a non-interface type T or *T, the returned Method's Type and Func
// fields describe a function whose first argument is the receiver.
//
// For an interface type, the returned Method's Type field gives the
// method signature, without a receiver, and the Func field is nil.
MethodByName(string) (Method, bool)
// NumMethod returns the number of exported methods in the type's method set.
NumMethod() int
// Name returns the type's name within its package.
// It returns an empty string for unnamed types.
Name() string
// PkgPath returns a named type's package path, that is, the import path
// that uniquely identifies the package, such as "encoding/base64".
// If the type was predeclared (string, error) or unnamed (*T, struct{}, []int),
// the package path will be the empty string.
PkgPath() string
// Size returns the number of bytes needed to store
// a value of the given type; it is analogous to unsafe.Sizeof.
Size() uintptr
// String returns a string representation of the type.
// The string representation may use shortened package names
// (e.g., base64 instead of "encoding/base64") and is not
// guaranteed to be unique among types. To test for type identity,
// compare the Types directly.
String() string
// Kind returns the specific kind of this type.
Kind() Kind
// Implements reports whether the type implements the interface type u.
Implements(u Type) bool
// AssignableTo reports whether a value of the type is assignable to type u.
AssignableTo(u Type) bool
// ConvertibleTo reports whether a value of the type is convertible to type u.
ConvertibleTo(u Type) bool
// Comparable reports whether values of this type are comparable.
Comparable() bool
// Methods applicable only to some types, depending on Kind.
// The methods allowed for each kind are:
//
// Int*, Uint*, Float*, Complex*: Bits
// Array: Elem, Len
// Chan: ChanDir, Elem
// Func: In, NumIn, Out, NumOut, IsVariadic.
// Map: Key, Elem
// Ptr: Elem
// Slice: Elem
// Struct: Field, FieldByIndex, FieldByName, FieldByNameFunc, NumField
// Bits returns the size of the type in bits.
// It panics if the type's Kind is not one of the
// sized or unsized Int, Uint, Float, or Complex kinds.
Bits() int
// ChanDir returns a channel type's direction.
// It panics if the type's Kind is not Chan.
ChanDir() ChanDir
// IsVariadic reports whether a function type's final input parameter
// is a "..." parameter. If so, t.In(t.NumIn() - 1) returns the parameter's
// implicit actual type []T.
//
// For concreteness, if t represents func(x int, y ... float64), then
//
// t.NumIn() == 2
// t.In(0) is the reflect.Type for "int"
// t.In(1) is the reflect.Type for "[]float64"
// t.IsVariadic() == true
//
// IsVariadic panics if the type's Kind is not Func.
IsVariadic() bool
// Elem returns a type's element type.
// It panics if the type's Kind is not Array, Chan, Map, Ptr, or Slice.
Elem() Type
// Field returns a struct type's i'th field.
// It panics if the type's Kind is not Struct.
// It panics if i is not in the range [0, NumField()).
Field(i int) StructField
// FieldByIndex returns the nested field corresponding
// to the index sequence. It is equivalent to calling Field
// successively for each index i.
// It panics if the type's Kind is not Struct.
FieldByIndex(index []int) StructField
// FieldByName returns the struct field with the given name
// and a boolean indicating if the field was found.
FieldByName(name string) (StructField, bool)
// FieldByNameFunc returns the struct field with a name
// that satisfies the match function and a boolean indicating if
// the field was found.
//
// FieldByNameFunc considers the fields in the struct itself
// and then the fields in any anonymous structs, in breadth first order,
// stopping at the shallowest nesting depth containing one or more
// fields satisfying the match function. If multiple fields at that depth
// satisfy the match function, they cancel each other
// and FieldByNameFunc returns no match.
// This behavior mirrors Go's handling of name lookup in
// structs containing anonymous fields.
FieldByNameFunc(match func(string) bool) (StructField, bool)
// In returns the type of a function type's i'th input parameter.
// It panics if the type's Kind is not Func.
// It panics if i is not in the range [0, NumIn()).
In(i int) Type
// Key returns a map type's key type.
// It panics if the type's Kind is not Map.
Key() Type
// Len returns an array type's length.
// It panics if the type's Kind is not Array.
Len() int
// NumField returns a struct type's field count.
// It panics if the type's Kind is not Struct.
NumField() int
// NumIn returns a function type's input parameter count.
// It panics if the type's Kind is not Func.
NumIn() int
// NumOut returns a function type's output parameter count.
// It panics if the type's Kind is not Func.
NumOut() int
// Out returns the type of a function type's i'th output parameter.
// It panics if the type's Kind is not Func.
// It panics if i is not in the range [0, NumOut()).
Out(i int) Type
common() *rtype
uncommon() *uncommonType
}
// BUG(rsc): FieldByName and related functions consider struct field names to be equal
// if the names are equal, even if they are unexported names originating
// in different packages. The practical effect of this is that the result of
// t.FieldByName("x") is not well defined if the struct type t contains
// multiple fields named x (embedded from different packages).
// FieldByName may return one of the fields named x or may report that there are none.
// See golang.org/issue/4876 for more details.
/*
* These data structures are known to the compiler (../../cmd/internal/gc/reflect.go).
* A few are known to ../runtime/type.go to convey to debuggers.
* They are also known to ../runtime/type.go.
*/
// A Kind represents the specific kind of type that a Type represents.
// The zero Kind is not a valid kind.
type Kind uint
const (
Invalid Kind = iota
Bool
Int
Int8
Int16
Int32
Int64
Uint
Uint8
Uint16
Uint32
Uint64
Uintptr
Float32
Float64
Complex64
Complex128
Array
Chan
Func
Interface
Map
Ptr
Slice
String
Struct
UnsafePointer
)
// tflag is used by an rtype to signal what extra type information is
// available in the memory directly following the rtype value.
//
// tflag values must be kept in sync with copies in:
// cmd/compile/internal/gc/reflect.go
// cmd/link/internal/ld/decodesym.go
// runtime/type.go
type tflag uint8
const (
// tflagUncommon means that there is a pointer, *uncommonType,
// just beyond the outer type structure.
//
// For example, if t.Kind() == Struct and t.tflag&tflagUncommon != 0,
// then t has uncommonType data and it can be accessed as:
//
// type tUncommon struct {
// structType
// u uncommonType
// }
// u := &(*tUncommon)(unsafe.Pointer(t)).u
tflagUncommon tflag = 1 << 0
// tflagExtraStar means the name in the str field has an
// extraneous '*' prefix. This is because for most types T in
// a program, the type *T also exists and reusing the str data
// saves binary size.
tflagExtraStar tflag = 1 << 1
// tflagNamed means the type has a name.
tflagNamed tflag = 1 << 2
)
// rtype is the common implementation of most values.
// It is embedded in other, public struct types, but always
// with a unique tag like `reflect:"array"` or `reflect:"ptr"`
// so that code cannot convert from, say, *arrayType to *ptrType.
//
// rtype must be kept in sync with ../runtime/type.go:/^type._type.
type rtype struct {
size uintptr
ptrdata uintptr // number of bytes in the type that can contain pointers
hash uint32 // hash of type; avoids computation in hash tables
tflag tflag // extra type information flags
align uint8 // alignment of variable with this type
fieldAlign uint8 // alignment of struct field with this type
kind uint8 // enumeration for C
alg *typeAlg // algorithm table
gcdata *byte // garbage collection data
str nameOff // string form
ptrToThis typeOff // type for pointer to this type, may be zero
}
// a copy of runtime.typeAlg
type typeAlg struct {
// function for hashing objects of this type
// (ptr to object, seed) -> hash
hash func(unsafe.Pointer, uintptr) uintptr
// function for comparing objects of this type
// (ptr to object A, ptr to object B) -> ==?
equal func(unsafe.Pointer, unsafe.Pointer) bool
}
// Method on non-interface type
type method struct {
name nameOff // name of method
mtyp typeOff // method type (without receiver)
ifn textOff // fn used in interface call (one-word receiver)
tfn textOff // fn used for normal method call
}
// uncommonType is present only for types with names or methods
// (if T is a named type, the uncommonTypes for T and *T have methods).
// Using a pointer to this struct reduces the overall size required
// to describe an unnamed type with no methods.
type uncommonType struct {
pkgPath nameOff // import path; empty for built-in types like int, string
mcount uint16 // number of methods
_ uint16 // unused
moff uint32 // offset from this uncommontype to [mcount]method
_ uint32 // unused
}
// ChanDir represents a channel type's direction.
type ChanDir int
const (
RecvDir ChanDir = 1 << iota // <-chan
SendDir // chan<-
BothDir = RecvDir | SendDir // chan
)
// arrayType represents a fixed array type.
type arrayType struct {
rtype `reflect:"array"`
elem *rtype // array element type
slice *rtype // slice type
len uintptr
}
// chanType represents a channel type.
type chanType struct {
rtype `reflect:"chan"`
elem *rtype // channel element type
dir uintptr // channel direction (ChanDir)
}
// funcType represents a function type.
//
// A *rtype for each in and out parameter is stored in an array that
// directly follows the funcType (and possibly its uncommonType). So
// a function type with one method, one input, and one output is:
//
// struct {
// funcType
// uncommonType
// [2]*rtype // [0] is in, [1] is out
// }
type funcType struct {
rtype `reflect:"func"`
inCount uint16
outCount uint16 // top bit is set if last input parameter is ...
}
// imethod represents a method on an interface type
type imethod struct {
name nameOff // name of method
typ typeOff // .(*FuncType) underneath
}
// interfaceType represents an interface type.
type interfaceType struct {
rtype `reflect:"interface"`
pkgPath name // import path
methods []imethod // sorted by hash
}
// mapType represents a map type.
type mapType struct {
rtype `reflect:"map"`
key *rtype // map key type
elem *rtype // map element (value) type
bucket *rtype // internal bucket structure
hmap *rtype // internal map header
keysize uint8 // size of key slot
indirectkey uint8 // store ptr to key instead of key itself
valuesize uint8 // size of value slot
indirectvalue uint8 // store ptr to value instead of value itself
bucketsize uint16 // size of bucket
reflexivekey bool // true if k==k for all keys
needkeyupdate bool // true if we need to update key on an overwrite
}
// ptrType represents a pointer type.
type ptrType struct {
rtype `reflect:"ptr"`
elem *rtype // pointer element (pointed at) type
}
// sliceType represents a slice type.
type sliceType struct {
rtype `reflect:"slice"`
elem *rtype // slice element type
}
// Struct field
type structField struct {
name name // name is always non-empty
typ *rtype // type of field
offsetAnon uintptr // byte offset of field<<1 | isAnonymous
}
func (f *structField) offset() uintptr {
return f.offsetAnon >> 1
}
func (f *structField) anon() bool {
return f.offsetAnon&1 != 0
}
// structType represents a struct type.
type structType struct {
rtype `reflect:"struct"`
pkgPath name
fields []structField // sorted by offset
}
// name is an encoded type name with optional extra data.
//
// The first byte is a bit field containing:
//
// 1<<0 the name is exported
// 1<<1 tag data follows the name
// 1<<2 pkgPath nameOff follows the name and tag
//
// The next two bytes are the data length:
//
// l := uint16(data[1])<<8 | uint16(data[2])
//
// Bytes [3:3+l] are the string data.
//
// If tag data follows then bytes 3+l and 3+l+1 are the tag length,
// with the data following.
//
// If the import path follows, then 4 bytes at the end of
// the data form a nameOff. The import path is only set for concrete
// methods that are defined in a different package than their type.
//
// If a name starts with "*", then the exported bit represents
// whether the pointed to type is exported.
type name struct {
bytes *byte
}
func (n name) data(off int) *byte {
return (*byte)(add(unsafe.Pointer(n.bytes), uintptr(off)))
}
func (n name) isExported() bool {
return (*n.bytes)&(1<<0) != 0
}
func (n name) nameLen() int {
return int(uint16(*n.data(1))<<8 | uint16(*n.data(2)))
}
func (n name) tagLen() int {
if *n.data(0)&(1<<1) == 0 {
return 0
}
off := 3 + n.nameLen()
return int(uint16(*n.data(off))<<8 | uint16(*n.data(off + 1)))
}
func (n name) name() (s string) {
if n.bytes == nil {
return
}
b := (*[4]byte)(unsafe.Pointer(n.bytes))
hdr := (*stringHeader)(unsafe.Pointer(&s))
hdr.Data = unsafe.Pointer(&b[3])
hdr.Len = int(b[1])<<8 | int(b[2])
return s
}
func (n name) tag() (s string) {
tl := n.tagLen()
if tl == 0 {
return ""
}
nl := n.nameLen()
hdr := (*stringHeader)(unsafe.Pointer(&s))
hdr.Data = unsafe.Pointer(n.data(3 + nl + 2))
hdr.Len = tl
return s
}
func (n name) pkgPath() string {
if n.bytes == nil || *n.data(0)&(1<<2) == 0 {
return ""
}
off := 3 + n.nameLen()
if tl := n.tagLen(); tl > 0 {
off += 2 + tl
}
var nameOff int32
copy((*[4]byte)(unsafe.Pointer(&nameOff))[:], (*[4]byte)(unsafe.Pointer(n.data(off)))[:])
pkgPathName := name{(*byte)(resolveTypeOff(unsafe.Pointer(n.bytes), nameOff))}
return pkgPathName.name()
}
// round n up to a multiple of a. a must be a power of 2.
func round(n, a uintptr) uintptr {
return (n + a - 1) &^ (a - 1)
}
func newName(n, tag, pkgPath string, exported bool) name {
if len(n) > 1<<16-1 {
panic("reflect.nameFrom: name too long: " + n)
}
if len(tag) > 1<<16-1 {
panic("reflect.nameFrom: tag too long: " + tag)
}
var bits byte
l := 1 + 2 + len(n)
if exported {
bits |= 1 << 0
}
if len(tag) > 0 {
l += 2 + len(tag)
bits |= 1 << 1
}
if pkgPath != "" {
bits |= 1 << 2
}
b := make([]byte, l)
b[0] = bits
b[1] = uint8(len(n) >> 8)
b[2] = uint8(len(n))
copy(b[3:], n)
if len(tag) > 0 {
tb := b[3+len(n):]
tb[0] = uint8(len(tag) >> 8)
tb[1] = uint8(len(tag))
copy(tb[2:], tag)
}
if pkgPath != "" {
panic("reflect: creating a name with a package path is not supported")
}
return name{bytes: &b[0]}
}
/*
* The compiler knows the exact layout of all the data structures above.
* The compiler does not know about the data structures and methods below.
*/
// Method represents a single method.
type Method struct {
// Name is the method name.
// PkgPath is the package path that qualifies a lower case (unexported)
// method name. It is empty for upper case (exported) method names.
// The combination of PkgPath and Name uniquely identifies a method
// in a method set.
// See https://golang.org/ref/spec#Uniqueness_of_identifiers
Name string
PkgPath string
Type Type // method type
Func Value // func with receiver as first argument
Index int // index for Type.Method
}
const (
kindDirectIface = 1 << 5
kindGCProg = 1 << 6 // Type.gc points to GC program
kindNoPointers = 1 << 7
kindMask = (1 << 5) - 1
)
func (k Kind) String() string {
if int(k) < len(kindNames) {
return kindNames[k]
}
return "kind" + strconv.Itoa(int(k))
}
var kindNames = []string{
Invalid: "invalid",
Bool: "bool",
Int: "int",
Int8: "int8",
Int16: "int16",
Int32: "int32",
Int64: "int64",
Uint: "uint",
Uint8: "uint8",
Uint16: "uint16",
Uint32: "uint32",
Uint64: "uint64",
Uintptr: "uintptr",
Float32: "float32",
Float64: "float64",
Complex64: "complex64",
Complex128: "complex128",
Array: "array",
Chan: "chan",
Func: "func",
Interface: "interface",
Map: "map",
Ptr: "ptr",
Slice: "slice",
String: "string",
Struct: "struct",
UnsafePointer: "unsafe.Pointer",
}
func (t *uncommonType) methods() []method {
return (*[1 << 16]method)(add(unsafe.Pointer(t), uintptr(t.moff)))[:t.mcount:t.mcount]
}
// resolveNameOff resolves a name offset from a base pointer.
// The (*rtype).nameOff method is a convenience wrapper for this function.
// Implemented in the runtime package.
func resolveNameOff(ptrInModule unsafe.Pointer, off int32) unsafe.Pointer
// resolveTypeOff resolves an *rtype offset from a base type.
// The (*rtype).typeOff method is a convenience wrapper for this function.
// Implemented in the runtime package.
func resolveTypeOff(rtype unsafe.Pointer, off int32) unsafe.Pointer
// resolveTextOff resolves an function pointer offset from a base type.
// The (*rtype).textOff method is a convenience wrapper for this function.
// Implemented in the runtime package.
func resolveTextOff(rtype unsafe.Pointer, off int32) unsafe.Pointer
// addReflectOff adds a pointer to the reflection lookup map in the runtime.
// It returns a new ID that can be used as a typeOff or textOff, and will
// be resolved correctly. Implemented in the runtime package.
func addReflectOff(ptr unsafe.Pointer) int32
// resolveReflectType adds a name to the reflection lookup map in the runtime.
// It returns a new nameOff that can be used to refer to the pointer.
func resolveReflectName(n name) nameOff {
return nameOff(addReflectOff(unsafe.Pointer(n.bytes)))
}
// resolveReflectType adds a *rtype to the reflection lookup map in the runtime.
// It returns a new typeOff that can be used to refer to the pointer.
func resolveReflectType(t *rtype) typeOff {
return typeOff(addReflectOff(unsafe.Pointer(t)))
}
// resolveReflectText adds a function pointer to the reflection lookup map in
// the runtime. It returns a new textOff that can be used to refer to the
// pointer.
func resolveReflectText(ptr unsafe.Pointer) textOff {
return textOff(addReflectOff(ptr))
}
type nameOff int32 // offset to a name
type typeOff int32 // offset to an *rtype
type textOff int32 // offset from top of text section
func (t *rtype) nameOff(off nameOff) name {
return name{(*byte)(resolveNameOff(unsafe.Pointer(t), int32(off)))}
}
func (t *rtype) typeOff(off typeOff) *rtype {
return (*rtype)(resolveTypeOff(unsafe.Pointer(t), int32(off)))
}
func (t *rtype) textOff(off textOff) unsafe.Pointer {
return resolveTextOff(unsafe.Pointer(t), int32(off))
}
func (t *rtype) uncommon() *uncommonType {
if t.tflag&tflagUncommon == 0 {
return nil
}
switch t.Kind() {
case Struct:
return &(*structTypeUncommon)(unsafe.Pointer(t)).u
case Ptr:
type u struct {
ptrType
u uncommonType
}
return &(*u)(unsafe.Pointer(t)).u
case Func:
type u struct {
funcType
u uncommonType
}
return &(*u)(unsafe.Pointer(t)).u
case Slice:
type u struct {
sliceType
u uncommonType
}
return &(*u)(unsafe.Pointer(t)).u
case Array:
type u struct {
arrayType
u uncommonType
}
return &(*u)(unsafe.Pointer(t)).u
case Chan:
type u struct {
chanType
u uncommonType
}
return &(*u)(unsafe.Pointer(t)).u
case Map:
type u struct {
mapType
u uncommonType
}
return &(*u)(unsafe.Pointer(t)).u
case Interface:
type u struct {
interfaceType
u uncommonType
}
return &(*u)(unsafe.Pointer(t)).u
default:
type u struct {
rtype
u uncommonType
}
return &(*u)(unsafe.Pointer(t)).u
}
}
func (t *rtype) String() string {
s := t.nameOff(t.str).name()
if t.tflag&tflagExtraStar != 0 {
return s[1:]
}
return s
}
func (t *rtype) Size() uintptr { return t.size }
func (t *rtype) Bits() int {
if t == nil {
panic("reflect: Bits of nil Type")
}
k := t.Kind()
if k < Int || k > Complex128 {
panic("reflect: Bits of non-arithmetic Type " + t.String())
}
return int(t.size) * 8
}
func (t *rtype) Align() int { return int(t.align) }
func (t *rtype) FieldAlign() int { return int(t.fieldAlign) }
func (t *rtype) Kind() Kind { return Kind(t.kind & kindMask) }
func (t *rtype) pointers() bool { return t.kind&kindNoPointers == 0 }
func (t *rtype) common() *rtype { return t }
var methodCache sync.Map // map[*rtype][]method
func (t *rtype) exportedMethods() []method {
methodsi, found := methodCache.Load(t)
if found {
return methodsi.([]method)
}
ut := t.uncommon()
if ut == nil {
return nil
}
allm := ut.methods()
allExported := true
for _, m := range allm {
name := t.nameOff(m.name)
if !name.isExported() {
allExported = false
break
}
}
var methods []method
if allExported {
methods = allm
} else {
methods = make([]method, 0, len(allm))
for _, m := range allm {
name := t.nameOff(m.name)
if name.isExported() {
methods = append(methods, m)
}
}
methods = methods[:len(methods):len(methods)]
}
methodsi, _ = methodCache.LoadOrStore(t, methods)
return methodsi.([]method)
}
func (t *rtype) NumMethod() int {
if t.Kind() == Interface {
tt := (*interfaceType)(unsafe.Pointer(t))
return tt.NumMethod()
}
if t.tflag&tflagUncommon == 0 {
return 0 // avoid methodCache synchronization
}
return len(t.exportedMethods())
}
func (t *rtype) Method(i int) (m Method) {
if t.Kind() == Interface {
tt := (*interfaceType)(unsafe.Pointer(t))
return tt.Method(i)
}
methods := t.exportedMethods()
if i < 0 || i >= len(methods) {
panic("reflect: Method index out of range")
}
p := methods[i]
pname := t.nameOff(p.name)
m.Name = pname.name()
fl := flag(Func)
mtyp := t.typeOff(p.mtyp)
ft := (*funcType)(unsafe.Pointer(mtyp))
in := make([]Type, 0, 1+len(ft.in()))
in = append(in, t)
for _, arg := range ft.in() {
in = append(in, arg)
}
out := make([]Type, 0, len(ft.out()))
for _, ret := range ft.out() {
out = append(out, ret)
}
mt := FuncOf(in, out, ft.IsVariadic())
m.Type = mt
tfn := t.textOff(p.tfn)
fn := unsafe.Pointer(&tfn)
m.Func = Value{mt.(*rtype), fn, fl}
m.Index = i
return m
}
func (t *rtype) MethodByName(name string) (m Method, ok bool) {
if t.Kind() == Interface {
tt := (*interfaceType)(unsafe.Pointer(t))
return tt.MethodByName(name)
}
ut := t.uncommon()
if ut == nil {
return Method{}, false
}
utmethods := ut.methods()
for i := 0; i < int(ut.mcount); i++ {
p := utmethods[i]
pname := t.nameOff(p.name)
if pname.isExported() && pname.name() == name {
return t.Method(i), true
}
}
return Method{}, false
}
func (t *rtype) PkgPath() string {
if t.tflag&tflagNamed == 0 {
return ""
}
ut := t.uncommon()
if ut == nil {
return ""
}
return t.nameOff(ut.pkgPath).name()
}
func hasPrefix(s, prefix string) bool {
return len(s) >= len(prefix) && s[:len(prefix)] == prefix
}
func (t *rtype) Name() string {
if t.tflag&tflagNamed == 0 {
return ""
}
s := t.String()
i := len(s) - 1
for i >= 0 {
if s[i] == '.' {
break
}
i--
}
return s[i+1:]
}
func (t *rtype) ChanDir() ChanDir {
if t.Kind() != Chan {
panic("reflect: ChanDir of non-chan type")
}
tt := (*chanType)(unsafe.Pointer(t))
return ChanDir(tt.dir)
}
func (t *rtype) IsVariadic() bool {
if t.Kind() != Func {
panic("reflect: IsVariadic of non-func type")
}
tt := (*funcType)(unsafe.Pointer(t))
return tt.outCount&(1<<15) != 0
}
func (t *rtype) Elem() Type {
switch t.Kind() {
case Array:
tt := (*arrayType)(unsafe.Pointer(t))
return toType(tt.elem)
case Chan:
tt := (*chanType)(unsafe.Pointer(t))
return toType(tt.elem)
case Map:
tt := (*mapType)(unsafe.Pointer(t))
return toType(tt.elem)
case Ptr:
tt := (*ptrType)(unsafe.Pointer(t))
return toType(tt.elem)
case Slice:
tt := (*sliceType)(unsafe.Pointer(t))
return toType(tt.elem)
}
panic("reflect: Elem of invalid type")
}
func (t *rtype) Field(i int) StructField {
if t.Kind() != Struct {
panic("reflect: Field of non-struct type")
}
tt := (*structType)(unsafe.Pointer(t))
return tt.Field(i)
}
func (t *rtype) FieldByIndex(index []int) StructField {
if t.Kind() != Struct {
panic("reflect: FieldByIndex of non-struct type")
}
tt := (*structType)(unsafe.Pointer(t))
return tt.FieldByIndex(index)
}
func (t *rtype) FieldByName(name string) (StructField, bool) {
if t.Kind() != Struct {
panic("reflect: FieldByName of non-struct type")
}
tt := (*structType)(unsafe.Pointer(t))
return tt.FieldByName(name)
}
func (t *rtype) FieldByNameFunc(match func(string) bool) (StructField, bool) {
if t.Kind() != Struct {
panic("reflect: FieldByNameFunc of non-struct type")
}
tt := (*structType)(unsafe.Pointer(t))
return tt.FieldByNameFunc(match)
}
func (t *rtype) In(i int) Type {
if t.Kind() != Func {
panic("reflect: In of non-func type")
}
tt := (*funcType)(unsafe.Pointer(t))
return toType(tt.in()[i])
}
func (t *rtype) Key() Type {
if t.Kind() != Map {
panic("reflect: Key of non-map type")