reflect

package
v1.8.11 Latest Latest
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 Go to latest Published: May 26, 2024 License: MIT Imports: 5 Imported by: 1

Documentation

Index

Constants

View Source 
const (
	F_direct    = 1 << 5
	F_kind_mask = (1 << 5) - 1
)

GoType.KindFlags const

Variables

View Source 
var (
	PtrOffset = func() uintptr {
		return unsafe.Offsetof(e.Value)
	}()
	KindOffset = func() uintptr { return unsafe.Offsetof(e.Type.KindFlags) }()
	ElemOffset = func() uintptr {
		return unsafe.Offsetof(new(PtrType).Elem)
	}()
	SliceDataOffset = func() uintptr {
		return unsafe.Offsetof(new(reflect.SliceHeader).Data)
	}()
)

Functions

func CanCast added in v1.5.0 

func CanCast(t1, t2 reflect.Type, strict bool) bool

func CopyFieldValueByType 

func CopyFieldValueByType(src any, sub any) bool

CopyFieldValueByType 根据类型复制字段 参数均为指针,sub类型为src field的类型

func CopyStruct 

func CopyStruct(src any, dest any) error

Copy 复制结构体,浅表复制

func DerefInterfaceValue added in v1.8.0 

func DerefInterfaceValue(v reflect.Value) reflect.Value

DerefInterfaceValue returns the value of the underlying type that implements the interface v.

func DerefPtrType added in v1.8.0 

func DerefPtrType(t reflect.Type) reflect.Type

func DerefPtrValue added in v1.8.0 

func DerefPtrValue(v reflect.Value) reflect.Value

DerefPtrValue returns the underlying non-pointer type value.

func DerefType added in v1.8.0 

func DerefType(typ reflect.Type) reflect.Type

获取引用类型的原始类型

func DerefValue added in v1.8.0 

func DerefValue(v reflect.Value) reflect.Value

DereferenceValue dereference and unpack interface, get the underlying non-pointer and non-interface value.

func FuncAddr added in v1.8.3 

func FuncAddr(f interface{}) unsafe.Pointer

func GetFuncPC added in v1.8.3 

func GetFuncPC(fn interface{}) uintptr

func Hash 

func Hash(v any) uint32

func InitPtr added in v1.8.0 

func InitPtr(v reflect.Value) reflect.Value

func InitStruct added in v1.8.0 

func InitStruct(v reflect.Value)

func RuntimeTypeID 

func RuntimeTypeID(t reflect.Type) uintptr

func SetField 

func SetField(structValue reflect.Value, name string, value any) error

func SetField2 

func SetField2(o any, field string, v any)

func SetSubField 

func SetSubField(src any, sub any) bool

SetSubField 设置字段值 参数均为指针,dst类型为src field的类型

func SetSubFieldValue 

func SetSubFieldValue(srcValue reflect.Value, subValue reflect.Value) bool

SetSubFieldValue 设置字段值 subValue为srcValue field的类型

func TypeInfo 

func TypeInfo(v interface{})

func UnderlyingType added in v1.8.0 

func UnderlyingType(typ reflect.Type) reflect.Type

获取引用类型的底层类型 Deprecated: Use DerefType instead

Types

type ArrayType added in v1.8.3 

type ArrayType struct {
	Type
	Elem  *Type // array element type
	Slice *Type // Slice type
	Len   uintptr
}

ArrayType represents a fixed array type.

type ChanType 

type ChanType struct {
	Type
	Elem *Type   // channel element type
	Dir  uintptr // channel direction (ChanDir)
}

ChanType represents a channel type.

type Eface 

type Eface struct {
	Type  *Type
	Value unsafe.Pointer
}

func UnpackEface added in v1.8.3 

func UnpackEface(v interface{}) Eface

func (Eface) Pack added in v1.8.3 

func (self Eface) Pack() (v any)

type Flag 

type Flag uintptr
const (
	FlagKindWidth        = 5 // there are 27 kinds
	FlagKindMask    Flag = 1<<FlagKindWidth - 1
	FlagStickyRO    Flag = 1 << 5
	FlagEmbedRO     Flag = 1 << 6
	FlagIndir       Flag = 1 << 7
	FlagAddr        Flag = 1 << 8
	FlagMethod      Flag = 1 << 9
	FlagMethodShift      = 10
	FlagRO          Flag = FlagStickyRO | FlagEmbedRO
)

type Func 

type Func struct {
	Entry   uintptr // start pc
	Nameoff int32   // function name

	Args        int32  // in/out args size
	Deferreturn uint32 // offset of start of a deferreturn call instruction from entry, if any.

	Pcsp     uint32
	Pcfile   uint32
	Pcln     uint32
	Npcdata  uint32
	CuOffset uint32 // runtime.cutab offset of this function's CU
	FuncID   FuncID // set for certain special runtime functions

	Nfuncdata uint8 // must be last
	// contains filtered or unexported fields
}

type FuncID 

type FuncID uint8

type FuncType added in v1.8.3 

type FuncType struct {
	Type
	InCount  uint16
	OutCount uint16 // top bit is set if last input parameter is ...
}

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 IMethod added in v1.8.3 

type IMethod struct {
	Name NameOff // name of method
	Typ  TypeOff // .(*FuncType) underneath
}

IMethod represents a method on an interface type

type Iface 

type Iface struct {
	Itab  *Itab
	Value unsafe.Pointer
}

func AssertI2I2 added in v1.8.3 

func AssertI2I2(t *Type, i Iface) (r Iface)

func UnpackIface added in v1.8.3 

func UnpackIface(v interface{}) Iface

type InterfaceType 

type InterfaceType struct {
	Type
	PkgPath *byte     // import path
	Methods []IMethod // sorted by hash
}

interfaceType represents an interface type.

func IfaceType added in v1.8.3 

func IfaceType(t *Type) *InterfaceType

type Itab 

type Itab struct {
	Inter  *InterfaceType
	Type   *Type
	Hash   uint32 // copy of _type.hash. Used for type switches.
	Unused [4]byte
	Fun    [1]uintptr // variable sized
}

func Getitab added in v1.8.3 

func Getitab(inter *InterfaceType, typ *Type, canfail bool) *Itab

type Map added in v1.8.3 

type Map struct {
	Count      int
	Flags      uint8
	B          uint8
	Overflow   uint16
	Hash0      uint32
	Buckets    unsafe.Pointer
	OldBuckets unsafe.Pointer
	Evacuate   uintptr
	Extra      unsafe.Pointer
}

type MapIterator added in v1.8.3 

type MapIterator struct {
	K           unsafe.Pointer
	V           unsafe.Pointer
	T           *MapType
	H           *Map
	Buckets     unsafe.Pointer
	Bptr        *unsafe.Pointer
	Overflow    *[]unsafe.Pointer
	OldOverflow *[]unsafe.Pointer
	StartBucket uintptr
	Offset      uint8
	Wrapped     bool
	B           uint8
	I           uint8
	Bucket      uintptr
	CheckBucket uintptr
}

type MapType 

type MapType struct {
	Type
	Key    *Type // map key type
	Elem   *Type // map element (value) type
	Bucket *Type // internal bucket structure
	// function for hashing keys (ptr to key, seed) -> hash
	Hasher     func(unsafe.Pointer, uintptr) uintptr
	KeySize    uint8  // size of key slot
	ValueSize  uint8  // size of value slot
	BucketSize uint16 // size of bucket
	Flags      uint32
}

MapType represents a map type.

func ToMapType added in v1.8.3 

func ToMapType(t *Type) *MapType

func (*MapType) IndirectElem added in v1.8.3 

func (self *MapType) IndirectElem() bool

type NameOff 

type NameOff int32 // offset to a name

type PtrType 

type PtrType struct {
	Type
	Elem *Type // pointer element (pointed at) type
}

PtrType represents a pointer type.

type Slice added in v1.8.3 

type Slice struct {
	Ptr unsafe.Pointer
	Len int
	Cap int
}

type SliceType 

type SliceType struct {
	Type
	Elem *Type // Slice element type
}

SliceType represents a Slice type.

type String added in v1.8.3 

type String struct {
	Ptr unsafe.Pointer
	Len int
}

type StructField 

type StructField struct {
	Name        *byte   // name is always non-empty
	Typ         *Type   // type of field
	OffsetEmbed uintptr // byte offset of field<<1 | isEmbedded
}

Struct field

type StructType 

type StructType struct {
	Type
	PkgPath *byte
	Fields  []StructField // sorted by offset
}

StructType represents a struct type.

type TextOff 

type TextOff int32 // offset from top of text section

type Type 

type Type 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
	Flags      uint8   // extra type information flags
	Align      uint8   // alignment of variable with this type
	FieldAlign uint8   // alignment of struct field with this type
	KindFlags  uint8   // enumeration for C
	// function for comparing objects of this type
	// (ptr to object A, ptr to object B) -> ==?
	Equal func(unsafe.Pointer, unsafe.Pointer) bool
	// gcdata stores the GC type data for the garbage collector.
	// If the KindGCProg bit is set in kind, gcdata is a GC program.
	// Otherwise it is a ptrmask bitmap. See mbitmap.go for details.
	Gcdata    *byte   // garbage collection data
	Str       NameOff // string form
	PtrToThis TypeOff // type for pointer to this type, may be zero
}

Type must be kept in sync with ../runtime/type.go:/^type._type.

func PtrElem added in v1.8.3 

func PtrElem(t *Type) *Type

func TypeByOff added in v1.8.3 

func TypeByOff(section unsafe.Pointer, off int32) *Type

func UnpackType added in v1.8.3 

func UnpackType(t reflect.Type) *Type

func (*Type) Indirect added in v1.8.3 

func (self *Type) Indirect() bool

func (*Type) IsNamed added in v1.8.3 

func (self *Type) IsNamed() bool

func (*Type) Kind 

func (self *Type) Kind() reflect.Kind

func (*Type) Pack added in v1.8.3 

func (self *Type) Pack() (t reflect.Type)

func (*Type) String added in v1.8.3 

func (self *Type) String() string

type TypeOff 

type TypeOff int32 // offset to an *Rtype

type Value 

type Value struct {
	Typ *Type
	Ptr unsafe.Pointer
	Flag
}

func ConvertValue 

func ConvertValue(v reflect.Value) Value

func ValueOf 

func ValueOf(v interface{}) Value

func (Value) Kind 

func (v Value) Kind() reflect.Kind

Kind gets the reflect.Kind fastly.

func (Value) Pointer 

func (v Value) Pointer() uintptr

Pointer gets the pointer of i. NOTE: 

*T and T, gets diffrent pointer

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